Vertical injection molding machine

Abstract

The utility model relates to injection molding equipment, in particular to a vertical injection molding machine. A vertical injection molding machine comprises a rack, a working platform is arranged on the upper side of the front end of the rack, a rotatable rotating disc is arranged on the working platform, two injection molding positioning plates arranged in a mirror image mode are installed on the rotating disc, a liftable injection molding head is installed on the rear side of the working platform, and the injection molding head can conduct injection molding operation on molds fixed to the injection molding positioning plates. According to the vertical injection molding machine, a main body supporting structure is constructed through the rack, a working platform arranged on the upper side of the front end of the vertical injection molding machine is integrated with a rotatable turntable, two injection molding positioning plates symmetrically mounted on the turntable realize alternate injection molding operation of double-station molds, and a lifting injection molding head arranged on the rear side adopts a vertical movement mode; the injection molding machine can accurately align with a mold to complete molten plastic injection operation when the stations of the rotary table are switched, the continuous injection molding efficiency is effectively improved, and the whole equipment realizes synchronous operation of mold loading and unloading and injection molding procedures through cooperation of double-station parallel operation of the rotary table and dynamic positioning of the injection molding head.

Description

Technical Field

[0001] This utility model relates to injection molding equipment, and more particularly to a vertical injection molding machine. Background Technology

[0002] As a key piece of equipment for molding plastic products, vertical injection molding machines have always faced the dual challenges of multi-station collaborative operation and molding accuracy. Traditional equipment often suffers from mold offset due to misalignment of the turntable drive structure, affecting the stability of synchronous injection molding at two stations. Single-cylinder lifting mechanisms have inherent defects in terms of support strength and vibration suppression, which can easily lead to molding defects such as flash or insufficient filling. Although some improvement solutions have improved mechanical stability by adding locking sleeves and support columns, there is still the problem of cumulative error caused by the clearance between the turntable central shaft and the mold mounting plate. Although existing hot press injection molding equipment has attempted to integrate automated coating functions, insufficient heat dissipation efficiency and manual intervention still restrict continuous production capacity. Moreover, conventional limit devices are difficult to achieve high-precision indexing control, resulting in the overall equipment utilization rate being lower than the industry standard requirements. The current market urgently needs to achieve technological breakthroughs in three aspects: turntable drive accuracy, hot press heat dissipation efficiency, and automation of the injection molding process.

[0003] In view of the above-mentioned shortcomings, the designer actively researched and innovated in order to create a vertical injection molding machine that would have greater industrial value. Utility Model Content

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a vertical injection molding machine.

[0005] This utility model discloses a vertical injection molding machine, including a frame, a working platform on the upper front side of the frame, a rotatable turntable on the working platform, two mirror-shaped injection positioning plates installed on the turntable, and a liftable injection head installed on the rear side of the working platform. The injection head can perform injection molding operations on the mold fixed on the injection positioning plate.

[0006] This vertical injection molding machine uses a frame to construct the main support structure. The working platform at the front upper side integrates a rotatable turntable. Two injection positioning plates symmetrically installed on the turntable enable alternating injection operations between two molds. The lifting injection head configured at the rear adopts a vertical movement mode, which can accurately align with the mold to complete the injection of molten plastic when the turntable switches positions. Its lifting stroke and the rotation of the turntable form a time-coordinated sequence, effectively improving the efficiency of continuous injection molding. The entire equipment realizes the synchronous operation of mold loading and unloading and injection molding processes through the coordination of the parallel operation of the two workstations on the turntable and the dynamic positioning of the injection head.

[0007] Furthermore, the top of the injection head has a support plate, and the two sides of the support plate are fixedly connected to the telescopic rod of the lifting cylinder. The lifting cylinder is installed on the work platform, and the support plate has a material hopper for supplying material to the injection head.

[0008] The injection head is rigidly connected to the telescopic rods of the lifting cylinders on both sides via a support plate at the top. The lifting cylinders are fixed to the rear of the work platform to form a vertical drive system, enabling precise lifting control of the injection head. The support plate integrates a hopper to provide the injection head with molten plastic storage and continuous feeding functions. Its structural strength and vertical guiding characteristics ensure the stability of material conveying during the injection molding process.

[0009] Furthermore, the lower end of the lifting cylinder is installed on the upper horizontal plate with a through hole in the middle. There are three through holes at the front and rear ends of the upper horizontal plate. Locking sleeves are installed in the through holes. Three support columns pass through the locking sleeves and are fixed. The front support column passes through the through hole at the center of the turntable.

[0010] The lifting cylinder achieves vertical positioning by fixing its lower end to the middle through hole of the upper horizontal plate. The three through holes at the front and rear ends of the upper horizontal plate are embedded with locking sleeves to form a guide structure. The three support columns are rigidly fixed after passing through the locking sleeves. The front support column passes through the center through hole of the turntable, forming a coaxial constraint mechanism for the turntable rotation and lifting system. The clearance fit between the locking sleeve and the support column is eliminated by thread pre-tightening to ensure that the concentricity error between the turntable and the injection head is ≤0.1mm when the turntable is indexed.

[0011] Furthermore, a horizontal plate cylinder is installed at the bottom of the work platform. The telescopic rod of the horizontal plate cylinder is fixedly connected to the lower horizontal plate. The lower ends of the three support columns are fixedly installed to the lower horizontal plate. There are two rear support columns on the rear side of the work platform that pass through the work platform. The horizontal plate cylinder drives the upper horizontal plate fixed to the top of the support column to adjust the height.

[0012] The horizontal plate cylinder installed at the bottom of the work platform is rigidly connected to the lower horizontal plate through a telescopic rod. The lower ends of the three support columns are vertically fixed to the lower horizontal plate to form a three-point support system. The two support columns at the rear end pass through the reserved holes in the work platform to achieve axial guidance. When the horizontal plate cylinder extends or retracts, it drives the lower horizontal plate to move vertically, which drives the upper horizontal plate at the top of the support columns to adjust its height synchronously. Its stroke accuracy is controlled within ±0.1mm through the clearance fit between the support columns and the through holes of the work platform.

[0013] Furthermore, the turntable has a toothed ring on its outer circumference, and a rotary motor for driving the toothed ring is installed at the bottom of the work platform. The output shaft of the rotary motor passes through the bottom plate of the work platform and is equipped with drive teeth that mesh with the toothed ring. A support is installed in the middle of the work platform via a rotary bearing, and the support has a through hole in the middle. The turntable is fixed on the support.

[0014] The turntable forms a gear transmission system with the outer ring gear and the drive teeth at the end of the output shaft of the rotary motor. The meshing reaction force generated when the drive teeth mesh with the ring gear is transmitted to the work platform base through the four-point contact ball turntable bearing, realizing the precise indexing control of the turntable. The rotary bearing in the middle of the work platform adopts a double-row four-point contact structure. Its inner ring is rigidly connected to the support, and the outer ring is fixed to the platform base. Combined with the axial through-hole design in the middle of the support, it is used for the support column to pass through.

[0015] Furthermore, two limit cylinders are installed at the bottom of the work platform. Each limit cylinder has a limit head fixed to the end of its telescopic rod, and the limit head can be inserted into the corresponding limit hole on the surface of the turntable.

[0016] The dual limit cylinders at the bottom of the work platform are arranged symmetrically. The limit head at the end of its telescopic rod is precision machined to form a clearance fit with the limit holes distributed on the surface of the turntable, thereby achieving mechanical locking of the turntable rotation angle.

[0017] By means of the above solution, the present invention has at least the following advantages: the height of the injection head of this vertical injection molding machine is adjustable, which can meet the injection requirements of different injection molds. At the same time, two sets of injection molds are installed on the turntable, which can perform injection operations in a cycle, thereby improving the efficiency of injection operation.

[0018] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show a certain embodiment of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of this utility model after removing the turntable;

[0022] Figure 3 This is the utility model Figure 1 Side view;

[0023] Figure 4 This is the utility model Figure 2 A magnified view of a portion of the image;

[0024] In the diagram: 1. Frame, 2. Working platform, 3. Turntable, 4. Injection positioning plate, 5. Injection head, 6. Support plate, 7. Lifting cylinder, 8. Material bin, 9. Upper horizontal plate, 10. Support column, 11. Lock, 12. Horizontal plate cylinder, 13. Lower horizontal plate, 14. Gear ring, 15. Drive gear, 16. Support, 17. Limit head, 18. Limit hole. Detailed Implementation

[0025] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0026] See Figure 1 Figure 2 The injection positioning plates 4 symmetrically arranged on the turntable 3 realize the alternating injection operation of the two stations. When the turntable station is switched, it is driven by the servo direct drive system and uses grating positioning technology to achieve a repeatability positioning accuracy of ±0.008mm. The injection head 5 adopts a closed-loop servo lifting mechanism, combined with a double toggle force-increasing topology design, which can dynamically adjust the injection height and compensate for melt pressure fluctuations, ensuring that the injection pressure is accurately matched with the mold parting surface.

[0027] The injection head 5 is rigidly connected to the telescopic rods of the lifting cylinders 7 on both sides via the support plate 6. The lifting cylinders are driven by a servo closed-loop control system to achieve precise height adjustment at the ±0.02mm level, ensuring dynamic alignment and matching between the injection head and the mold gate. The support plate 6 integrates the spiral feeding system of the material hopper 8 for easy material feeding.

[0028] The lifting cylinder 7 forms a three-point rigid support structure with the support column 10 through the through hole in the middle of the upper horizontal plate 9. The cylinder extension and retraction is driven by the servo closed-loop system to achieve the lifting accuracy control of the injection head 5 at ±0.02mm level. The three support columns 10 pass through the locking sleeve 11 to form a guide constraint. The front support column and the center through hole of the turntable 3 adopt grating phase synchronization technology to ensure that the radial runout of the turntable is less than 0.005mm when switching between multiple workstations.

[0029] See Figure 3 The horizontal plate cylinder 12 drives the lower horizontal plate 13 through the telescopic rod to realize the synchronous lifting control of the three support columns 10. A high-precision closed-loop feedback system is used to make fine adjustments to the cylinder stroke at the ±0.015mm level to ensure that the flatness error of the upper horizontal plate 9 is less than 0.02mm / m2. The lower horizontal plate 13 is fixedly connected to the support columns 10. This structure shortens the mold switching height adjustment time to 8 seconds, while the stress concentration coefficient of the support columns 10 is reduced to below 1.15, and the continuous operation stability of the equipment is improved by 25%.

[0030] See Figure 4The turntable 3 is driven by the outer ring gear 14 and the drive gear 15 driven by the rotary motor to form a gear meshing transmission. The output shaft of the rotary motor passes through the bottom plate of the working platform 2 to drive the turntable to rotate. The rotary bearing support 16 in the middle of the working platform realizes the stable operation of the turntable. This structure transmits power and torque through the gear pair, and cooperates with the cross tapered roller bearing to support multi-directional loads, ensuring that the turntable remains stable when rotating at high speed. The through hole design in the middle of the support 16 can integrate the auxiliary transmission component 6, further optimizing the space layout.

[0031] The double limit cylinder at the bottom of the work platform 2 drives the limit head 17 to rise and fall vertically through the telescopic rod. The limit head 17 and the limit hole 18 on the surface of the turntable 3 form a mechanical interlock to achieve rapid positioning of the work station. This design eliminates accumulated errors through rigid contact and, together with the cylinder synchronous control logic, ensures the repeatability of positioning when switching between multiple work stations. The chamfered guide structure of the limit hole 18 reduces the impact of alignment, and the conical self-locking characteristic of the limit head 17 enhances the vibration resistance of the system.

[0032] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0033] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0034] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A vertical injection molding machine, comprising a frame (1), characterized in that: The upper front side of the frame (1) is a working platform (2), and there is a rotatable turntable (3) on the working platform (2). Two mirror-set injection positioning plates (4) are installed on the turntable (3). A liftable injection head (5) is installed on the rear side of the working platform (2). The injection head (5) can perform injection molding operations on the mold fixed on the injection positioning plate (4).

2. A vertical injection molding machine according to claim 1, characterized in that: The top of the injection head (5) has a support plate (6). The two sides of the support plate (6) are fixedly connected to the telescopic rod of the lifting cylinder (7). The lifting cylinder (7) is installed on the work platform (2). The support plate (6) has a material hopper (8) for supplying material to the injection head (5).

3. A vertical injection molding machine according to claim 2, characterized in that: The lower end of the lifting cylinder (7) is installed on the upper horizontal plate (9) with a through hole in the middle. There are three through holes at the front and rear ends of the upper horizontal plate (9). Locking sleeves (11) are installed in the through holes. Three support columns (10) are fixed after passing through the locking sleeves (11). The support column (10) at the front end passes through the through hole at the center of the turntable (3).

4. A vertical injection molding machine according to claim 3, characterized in that: A horizontal plate cylinder (12) is installed at the bottom of the work platform (2). The telescopic rod of the horizontal plate cylinder (12) is fixedly connected to the lower horizontal plate (13). The lower ends of the three support columns (10) are fixedly installed to the lower horizontal plate (13). There are two support columns (10) at the rear of the work platform (2) that pass through the work platform (2). The upper horizontal plate (9) fixed to the top of the support column (10) is adjusted in height by the horizontal plate cylinder (12).

5. A vertical injection molding machine according to claim 1, characterized in that: The outer ring of the turntable (3) has a gear ring (14). A rotary motor for driving the gear ring (14) to rotate is installed at the bottom of the working platform (2). The output shaft of the rotary motor passes through the bottom plate of the working platform (2) and is equipped with a drive gear (15). The drive gear (15) meshes with the gear ring (14). A support (16) is installed in the middle of the working platform (2) through a rotary bearing. The support (16) has a through hole in the middle. The turntable (3) is fixed on the support (16).

6. A vertical injection molding machine according to claim 5, characterized in that: Two limit cylinders are installed at the bottom of the work platform (2). Each limit cylinder has a limit head (17) fixed at the end of its telescopic rod. The limit head (17) can be inserted into the corresponding limit hole (18) on the surface of the turntable (3).

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