A core rotating injection molding device for a plastic turbine of a coffee maker

Abstract

The application provides a core rotating injection molding device for a coffee machine plastic turbine, and relates to the technical field of injection molding devices.The core rotating injection molding device comprises a molding assembly, which is composed of a rotating mechanism and a mold mechanism.The molding assembly can enable the rotating core to perform a rotating motion during the clamping and demolding processes, and the motion trajectory is completely matched with the spiral edge of the shaping block, so that the rotating core can rotate into or rotate out of the cavity along the spiral arc, effectively avoiding the phenomena of scraping, extruding and pulling of the core and the inner side of the turbine blade during the traditional axial core pulling, and eliminating the conditions of scratching, deformation and even cracking of the thin-walled blade, thereby significantly improving the product yield and molding precision.The core of the existing injection molding device for the coffee machine plastic turbine does not have a rotating matching function, and the core can only be directly pulled away from the cavity along the axial direction during demolding, which causes the core pulling motion trajectory to interfere with the spiral curved surface of the turbine blade.

Description

Technical Field

[0001] This invention relates to the field of injection molding apparatus technology, and more particularly to a core-rotating injection molding apparatus for a plastic turbine in a coffee machine. Background Technology

[0002] The plastic turbine of a coffee machine is the core plastic component of the coffee machine's water pump. It features spiral twisted blades that can pressurize and transport water at high speeds, providing stable fluid power for coffee extraction and ensuring the normal operation of water dispensing and extraction. The turbine is mainly manufactured using injection molding, where molten modified plastic is injected into a mold cavity, and after pressure holding and cooling solidification, a turbine blank is obtained. The complete turbine product is then obtained through demolding. Injection molding enables the mass production of such complex thin-walled components and can better match the shape and structure of the coffee machine's plastic turbine with production requirements.

[0003] The existing injection molding equipment for plastic turbines in coffee machines lacks a rotating adaptation function for its core. During demolding, the core can only be directly pulled out of the cavity axially. Since the turbine blades are spirally twisted, the core pulling trajectory interferes with the spiral curved surface of the turbine blades. During demolding, the core will generate strong scraping and squeezing tension with the inner side of the turbine blades, which can easily cause scratches, deformation, or even breakage of the thin-walled blades. This not only reduces the appearance quality of the finished turbine but also damages the molding precision of the blades, affecting the dynamic balance performance during subsequent assembly and use. This results in a high product scrap rate, making it difficult to meet the actual needs of large-scale stable production. It also has poor flexibility and low practicality. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a core-rotating injection molding device for a plastic turbine in a coffee machine. This solves the problem mentioned in the background that the core of the existing injection molding device for a plastic turbine in a coffee machine does not have a rotational adaptation function. During demolding, the core can only be directly pulled out of the cavity along the axial direction, causing the core-pulling trajectory to interfere with the helical surface of the turbine blades. This can easily cause problems such as scratches, deformation, or even breakage of the thin-walled blades.

[0005] This invention provides a core-rotation injection molding device for a plastic turbine in a coffee machine, specifically comprising: a base assembly and a molding assembly. The base assembly includes a mounting base, a mounting bracket, and a lifting push rod. The mounting bracket is fixedly mounted on the top of the mounting base, and the lifting push rod is fixedly mounted on the top of the mounting bracket. The base assembly also includes a connecting plate, which is inserted into the top of the mounting base. The bottom end of the lifting push rod is fixedly mounted on the top of the connecting plate. The molding assembly consists of a rotation mechanism and a mold mechanism. The rotating mechanism includes a gearbox, a drive rod, a control block, and a positioning rod. The gearbox is fixedly mounted on the top of the connecting plate, and the drive rod is inserted into the top of the mounting frame. The drive rod is rotatably connected to the top of the gearbox and is connected to the input shaft of the gearbox. The control block is inserted into the bottom of the mounting frame, and the positioning rod is rotatably connected inside the mounting frame. The mold mechanism includes an upper mold base, a rotating core, and a lower mold base. The upper mold base is fixedly mounted on the bottom of the connecting plate, and the rotating core is rotatably connected to the bottom of the upper mold base. The rotating shaft of the rotating core is connected to the output shaft of the gearbox. The lower mold base is fixedly mounted on the top of the mounting base and is located directly below the upper mold base and the rotating core.

[0006] Furthermore, the top of both the rotating core and the lower mold base is provided with multiple shaping blocks, and the shaping blocks of the rotating core and the lower mold base are staggered with each other. The edges of the shaping blocks are spiral-shaped, and after the rotating core and the lower mold base are spliced ​​together, their interiors have cavities that match the shape of the plastic turbine.

[0007] Furthermore, the bottom of the lower mold base is provided with an injection channel.

[0008] Furthermore, the gearbox has multiple sets of gear pairs with different transmission ratios inside, and the gears are switched through a shifting mechanism. The gearbox has multiple speed gears to adjust the transmission ratio between the drive rod and the rotating core.

[0009] Furthermore, the active rod has a control groove on its exterior and a control protrusion inside the control block, with the control protrusion inserted into the control groove.

[0010] Furthermore, the control groove consists of a reset groove arranged along the axial direction of the drive rod and a drive groove arranged spirally, with the bottom end of the drive groove connected to the top end of the reset groove.

[0011] Furthermore, the positioning rod has threads on its outer surface, and the positioning rod is screwed into the control block through the threaded connection of the rod body.

[0012] Furthermore, the mold mechanism is available in various specifications to produce different models of plastic turbines.

[0013] Furthermore, the control block has a track block with a "T" shaped cross section on its side, and the mounting frame has a track groove inside, into which the track block is inserted.

[0014] This invention provides a core-rotating injection molding device for a plastic turbine in a coffee machine, which has the following advantages: 1. By setting up a rotating mechanism and a mold mechanism, the rotating core can rotate during mold closing and demolding. Through the cooperation of the control protrusion on the control block and the drive groove and reset groove on the active rod, a compound motion trajectory of "first linear descent, then rotational descent" is achieved. This motion trajectory is perfectly matched with the spiral edge of the forming stop, allowing the rotating core to rotate into or out of the cavity along the spiral arc. This effectively avoids the scraping, squeezing and pulling phenomena between the core and the inner side of the turbine blade during traditional axial core pulling, and eliminates the situation of scratches, deformation or even breakage of thin-walled blades. This significantly improves product yield and molding accuracy, and ensures the dynamic balance performance of the turbine.

[0015] 2. By setting a positioning rod and using its threaded connection with the drive rod, the operating height of the control block in the mounting frame can be precisely adjusted. The change in the height of the control block changes the timing when the control protrusion enters the connection between the drive groove and the reset groove, thereby making the starting point of the rotation of the rotating core adjustable. This allows the base assembly and the rotating mechanism to adapt to mold mechanisms of different heights, greatly improving the versatility and flexibility of the device.

[0016] 3. By setting up a gearbox and utilizing its internal multiple sets of gear pairs with different transmission ratios and shifting mechanisms, the transmission ratio between the drive rod and the rotating core can be changed. Within a unit descent distance, the change in transmission ratio changes the actual rotation angle of the rotating core, thereby enabling the rotating mechanism to adapt to mold mechanisms with plastic forming blocks of different helical angles. This further improves the flexibility and adaptability of the device, allowing it to meet the production needs of various specifications of plastic turbines and reduce equipment investment costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0018] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0019] In the attached diagram: Figure 1 A schematic diagram of the overall structure of the present invention is shown.

[0020] Figure 2 A schematic diagram of the internal structure of the present invention is shown.

[0021] Figure 3 The present invention is shown. Figure 2 Enlarged structural diagram of part A in the middle.

[0022] Figure 4 A schematic diagram of the disassembled seat assembly and rotating mechanism of the present invention is shown.

[0023] Figure 5 A schematic diagram of the disassembled mold mechanism of the present invention is shown.

[0024] Figure 6 The present invention is shown. Figure 2 A schematic diagram of the structure when the control protrusion is located at the connection between the drive slot and the reset slot.

[0025] Figure 7 The present invention is shown. Figure 6 A schematic diagram of the structure when the lifting push rod continues to extend.

[0026] Figure 8 The present invention is shown. Figure 7 Enlarged structural diagram of part B in the middle.

[0027] Figure 9 The present invention is shown. Figure 7 Enlarged structural diagram of part C in the middle.

[0028] Figure 10 A schematic diagram of the mold mechanism of the present invention after assembly is shown.

[0029] List of reference numerals 1. Base assembly; 101. Mounting base; 102. Mounting stand; 1021. Track groove; 103. Lifting push rod; 104. Connecting plate; 2. Rotating mechanism; 201. Gearbox; 202. Drive rod; 2021. Reset groove; 2022. Drive groove; 203. Control block; 2031. Control protrusion; 2032. Track block; 204. Positioning rod; 3. Mold mechanism; 301. Upper mold base; 302. Rotating core; 3021. Shaping stop; 303. Lower mold base; 3031. Injection channel. Detailed Implementation

[0030] Please refer to Figures 1 to 10 : This invention proposes a core-rotating injection molding device for a plastic turbine in a coffee machine, comprising: a base assembly 1 and a molding assembly; The base assembly 1 includes a mounting base 101, a mounting bracket 102, and a lifting push rod 103. The mounting bracket 102 is fixedly mounted on the top of the mounting base 101, and the lifting push rod 103 is fixedly mounted on the top of the mounting bracket 102. The base assembly 1 also includes a connecting plate 104, which is inserted into the top of the mounting base 101. The bottom end of the push rod of the lifting push rod 103 is fixedly mounted on the top of the connecting plate 104. The molding assembly consists of a rotating mechanism 2 and a mold mechanism 3.

[0031] The mold mechanism 3 includes an upper mold base 301, a rotating core 302, and a lower mold base 303. The upper mold base 301 is fixedly installed at the bottom of the connecting plate 104. The rotating core 302 is rotatably connected to the bottom of the upper mold base 301. The rotating shaft of the rotating core 302 is connected to the output shaft of the gearbox 201. The lower mold base 303 is fixedly installed at the top of the mounting base 101 and is located directly below the upper mold base 301 and the rotating core 302. The top of both the rotating core 302 and the lower mold base 303 is provided with multiple shaping blocks 3021, which are staggered and arranged in a staggered manner. The edges of the shaping blocks 3021 are spiral-shaped. The bottom of the lower mold base 303 is provided with an injection channel 3031.

[0032] During operation, the lifting push rod 103 extends and retracts, driving the connecting plate 104 to rise and fall. The connecting plate 104 drives the upper mold base 301 and the rotating mechanism 2 to move synchronously. When the upper mold base 301 moves down and closes with the lower mold base 303, the rotating core 302 and the molding stop 3021 of the lower mold base 303 together form a cavity that matches the shape of the plastic turbine. Subsequently, the molten plastic is injected into the cavity through the injection channel 3031. After pressure holding and cooling solidification, the turbine blank is obtained. Finally, the complete turbine product is obtained by demolding.

[0033] The rotating mechanism 2 includes a gearbox 201, a drive rod 202, a control block 203, and a positioning rod 204. The gearbox 201 is fixedly installed on the top of the connecting plate 104. The drive rod 202 is inserted into the top of the mounting bracket 102, rotatably connected to the top of the gearbox 201, and connected to the input shaft of the gearbox 201. The control block 203 is inserted into the bottom of the mounting bracket 102. The side of the control block 203 is provided with a track block 2032 with a "T" shaped cross section. The inside of the mounting bracket 102 is provided with a track groove 1021. The track block 2032 is inserted into the track groove 1021 to ensure that the control block 203 can only move up and down and cannot rotate.

[0034] The active rod 202 has a control groove on its outside and a control protrusion 2031 on its inside. The control protrusion 2031 is inserted into the inside of the control groove. The control groove consists of a reset groove 2021 arranged along the axial direction of the active rod 202 and a drive groove 2022 arranged spirally. The bottom end of the drive groove 2022 is connected to the top end of the reset groove 2021.

[0035] Here, we will take the mold assembly operation as an example to explain in detail: In the initial downward movement stage, the lifting push rod 103 drives the upper mold base 301 and the rotating mechanism 2 to move downward through the connecting plate 104. Initially, the control protrusion 2031 is located inside the reset groove 2021. Since the reset groove 2021 is set along the axial direction, the active rod 202 will not be subjected to the circumferential component force, so it will not rotate. The rotating core 302 maintains the initial angle to avoid accidental rotation that could cause interference. The transition phase begins to rotate: As the connecting plate 104 continues to move down, when the control protrusion 2031 moves to the connection part of the drive groove 2022 and the reset groove 2021, the bottom plane of the rotating core 302 is just flush with the top plane of the lower mold base 303, and the shaping block 3021 is about to enter the mating area. The combined motion during the rotational descent phase: The lifting push rod 103 continues to extend, and the control protrusion 2031 enters the helically arranged drive groove 2022. Since the control block 203 is restricted from rotating by the track groove 1021, the control protrusion 2031, under the helical action of the drive groove 2022, applies a circumferential force to the drive rod 202, forcing the drive rod 202 to rotate. The drive rod 202 transmits torque to the input shaft of the gearbox 201. After being changed by the gearbox, it is transmitted from the output shaft to the rotating shaft of the rotating core 302, driving the rotating core 302 to rotate. As a result, while the upper mold base 301 continues to move downward, the rotating core 302 rotates synchronously. The shaping stop 3021 then smoothly rotates into the corresponding space of the lower mold base 303 along its own helical arc until it is completely closed.

[0036] After processing, the demolding process is the reverse of the above process. The lifting push rod 103 drives the connecting plate 104 to move upward, controls the protrusion 2031 to move in the opposite direction along the drive groove 2022, drives the rotating core 302 to reverse, and the shaping block 3021 smoothly rotates out along the spiral arc. After the control protrusion 2031 returns to the reset groove 2021, the rotating core 302 stops rotating, and the upper mold base 301 rises in a straight line to complete the demolding.

[0037] The positioning rod 204 is rotatably connected inside the mounting bracket 102, and its rod body is threaded on the outside, and is screwed into the control block 203 through the thread.

[0038] When changing the mold mechanism 3 to different heights, the operator only needs to rotate the positioning rod 204. The positioning rod 204 drives the control block 203 to move up and down along the track groove 1021 through the threaded transmission, precisely changing the initial height of the control block 203. The change in the height of the control block 203 determines the timing of the control protrusion 2031 entering the connection part between the drive groove 2022 and the reset groove 2021 (i.e., the timing of the rotation start point). This ensures that no matter how the thickness of the upper mold base 301 changes, the rotating core 302 can start rotating at the optimal time, thereby ensuring that the screwing action of the molding stop 3021 and the mold closing action are perfectly synchronized.

[0039] The gearbox 201 has multiple sets of gear pairs with different transmission ratios and is equipped with a shifting mechanism to achieve gear switching. This design enables the gearbox 201 to have multiple gears.

[0040] When the shaping stop 3021 of the mold mechanism 3 has different helix angles, in order to ensure that the rotational speed of the rotating core 302 matches the descent speed, it is necessary to change the rotational angle of the rotating core 302 per unit descent distance. At this time, the operator can change the transmission ratio of the gearbox 201 through the shifting mechanism, thereby adjusting the transmission ratio between the drive rod 202 and the rotating core 302. When the rotational speed of the drive rod 202 is constant, changing the transmission ratio can accurately control the final rotational angle of the rotating core 302, so that it can perfectly adapt to the shaping stop 3021 with different helix angles, and ensure that interference-free screwing in and out can be achieved under various specifications.

[0041] Example 2: In this example, the multiple configurations of the mold mechanism 3 and their adaptation methods will be described in detail. In order to achieve multiple uses of one machine and improve the return on investment of the equipment, the mold mechanism 3 is provided with a variety of different specifications. Each specification of the mold mechanism 3 includes an upper mold base 301, a rotating core 302 and a lower mold base 303. However, the internal cavity size, the helical angle of the shaping block 3021 and the overall height may vary depending on the type of plastic turbine to be produced.

[0042] According to the actual production plan, the operator can quickly replace the corresponding lower mold base 303 on the mounting base 101, and replace the corresponding upper mold base 301 and rotating core 302 at the bottom of the connecting plate 104. Since the mold closing height of different specifications of mold mechanisms 3 may be different, the height adjustment function in this invention needs to be used in conjunction. The specific operation is as follows: First, the operator rotates the positioning rod 204, which drives the control block 203 through its external thread. This causes the "T"-shaped track block 2032 on the side of the control block 203 to slide up and down along the track groove 1021 inside the mounting bracket 102, thereby precisely adjusting the vertical position of the control block 203. This adjustment changes the relative starting position of the control protrusion 2031 and the control groove (reset groove 2021 and drive groove 2022) on the active rod 202. Through this adjustment, it is ensured that no matter how the height of the upper mold base 301 changes, when the bottom plane of the rotating core 302 contacts the top plane of the lower mold base 303, the control protrusion 2031 is exactly located at the connection node of the reset groove 2021 and the drive groove 2022, thereby achieving precise synchronization between the rotation of the rotating core 302 and the linear descent of the upper mold base 301.

[0043] Meanwhile, since the forming blocks 3021 of different mold specifications may have different helical angles, in order to ensure that the rotating core 302 does not interfere with the turbine blades during the screwing process, the transmission ratio adjustment function of this invention needs to be used in conjunction with it. The specific operation is as follows: The operator manipulates the gear shifting mechanism outside the gearbox 201 to switch between gear pairs with different transmission ratios. By changing the transmission ratio between the drive rod 202 and the rotating core 302, the rotating core 302 can obtain a rotation angle that matches the helix angle of the forming stop 3021 of the mold specification within a unit descent distance. For example, for the forming stop 3021 with a larger helix angle, a larger transmission ratio can be switched to make the rotating core 302 rotate faster; for the forming stop 3021 with a smaller helix angle, a smaller transmission ratio is switched to ensure that the rotational linear velocity and the descent linear velocity are perfectly matched.

[0044] As mentioned above, by adjusting the height of the control block 203 through the positioning rod 204 and switching the transmission ratio through the gearbox 201, the seat assembly 1 and the rotating mechanism 2 can be perfectly adapted to various mold mechanisms 3 of different specifications. The operator only needs to make simple mechanical adjustments to quickly switch between producing different models of plastic turbines, which improves the practicality of the device.

Claims

1. A core-rotating injection molding apparatus for a plastic turbine of a coffee maker, comprising: A base assembly (1) and a molding assembly, wherein the base assembly (1) includes a mounting base (101), a mounting bracket (102), and a lifting push rod (103), the mounting bracket (102) being fixedly mounted on the top of the mounting base (101), and the lifting push rod (103) being fixedly mounted on the top of the mounting bracket (102); characterized in that the base assembly (1) further includes a connecting plate (104), and the connecting plate (104) is inserted into the top of the mounting base (101), and the bottom end of the push rod of the lifting push rod (103) is fixedly mounted on the top of the connecting plate (104); the molding assembly consists of a rotating mechanism (2) and a mold mechanism (3); The rotating mechanism (2) includes a gearbox (201), a drive rod (202), a control block (203), and a positioning rod (204). The gearbox (201) is fixedly mounted on the top of the connecting plate (104), and the drive rod (202) is inserted into the top of the mounting bracket (102). The drive rod (202) is rotatably connected to the top of the gearbox (201) and is connected to the input shaft of the gearbox (201). The control block (203) is inserted into the bottom of the mounting bracket (102), and the positioning rod (204) is rotatably connected to the bottom of the gearbox (201). The mold mechanism (3) includes an upper mold base (301), a rotating core (302), and a lower mold base (303). The upper mold base (301) is fixedly installed at the bottom of the connecting plate (104), and the rotating core (302) is rotatably connected to the bottom of the upper mold base (301). The rotating shaft of the rotating core (302) is connected to the output shaft of the gearbox (201). The lower mold base (303) is fixedly installed at the top of the mounting base (101), and the lower mold base (303) is located directly below the upper mold base (301) and the rotating core (302).

2. A core-rotating injection molding apparatus for a plastic turbine of a coffee maker according to claim 1, wherein The top of the rotating core (302) and the lower mold base (303) are provided with multiple shaping blocks (3021), and the shaping blocks (3021) of the rotating core (302) and the lower mold base (303) are staggered with each other. The edge of the shaping block (3021) is spiral. After the rotating core (302) and the lower mold base (303) are spliced ​​together, their interior has a cavity that matches the shape of the plastic turbine.

3. A core-rotating injection molding apparatus for a plastic turbine of a coffee maker according to claim 1, wherein The bottom of the lower mold base (303) is provided with an injection channel (3031).

4. A core-rotating injection molding apparatus for a plastic turbine of a coffee maker according to claim 1, wherein The gearbox (201) has multiple gear pairs with different transmission ratios inside, and the gears are switched through a shifting mechanism. The gearbox (201) has multiple gear positions to adjust the transmission ratio between the drive lever (202) and the rotating core (302).

5. A core-rotating injection molding apparatus for a plastic turbine of a coffee maker according to claim 1, wherein The active rod (202) has a control groove on its outside, and the control block (203) has a control protrusion (2031) inside, which is inserted into the control groove.

6. A core-rotating injection molding apparatus for a plastic turbine of a coffee maker according to claim 5, wherein The control groove consists of a reset groove (2021) arranged axially along the active rod (202) and a drive groove (2022) arranged spirally, with the bottom end of the drive groove (2022) connected to the top end of the reset groove (2021).

7. A core-rotating injection molding apparatus for a plastic turbine for a coffee maker according to claim 1, wherein The positioning rod (204) has threads on the outside of its body, and the positioning rod (204) is screwed into the inside of the control block (203) through the rod body threads.

8. A core-rotating injection molding apparatus for a plastic turbine of a coffee maker according to claim 1, wherein The mold mechanism (3) has various specifications for producing different models of plastic turbines.

9. A core-rotating injection molding apparatus for a plastic turbine of a coffee maker according to claim 1, wherein The control block (203) has a track block (2032) with a "T" shaped cross section on its side, and the mounting frame (102) has a track groove (1021) inside, with the track block (2032) inserted into the track groove (1021).

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