Rotary table mechanism of injection molding machine and injection molding machine

Abstract

This invention discloses a rotary table mechanism for an injection molding machine and an injection molding machine. The rotary table mechanism includes a support base, a rotating shaft mounted on the support base, and a disc seat rotatably mounted on the support base via the rotating shaft. Multiple mold mounting positions are symmetrically arranged around a central interval on the disc seat. The rotary table mechanism also includes a drive assembly and a support assembly located between the disc seat and the support base. The drive assembly includes an internal gear ring connected to the lower end face of the disc seat and a drive gear meshing with the internal gear ring. The internal gear ring is coaxially arranged with the disc seat, and the drive gear drives the disc seat to rotate. The support assembly includes at least a pad block arranged on the support base and an adjustment part connected to the pad block. The upper end face of the pad block is configured as an abutment surface. The adjustment part is used to adjust the size of the abutment surface according to the pressure state at the mold mounting positions on the disc seat. Dynamically adjusting the size of the pad block's abutment surface according to the force conditions at different mold mounting positions effectively reduces the problem of uneven loading caused by increased local loads.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and more particularly to an injection molding machine turntable mechanism and an injection molding machine. Background Technology

[0002] An injection molding machine is a molding device that heats and melts thermoplastic or thermosetting materials, then injects them into a mold cavity under pressure to form a molded product. In multi-station injection molding equipment, the disc-type structure is widely used in insert molding, continuous production, and other scenarios because it can cyclically switch between multiple stations. Each time the disc rotates through a predetermined angle, it switches the target mold to the injection station and the part removal station.

[0003] In existing disc-type injection molding equipment, the disc is typically mounted on the machine body via a central bearing or sliding support structure and rotated by a motor. During injection molding, after the mold is mounted on the disc, it sequentially switches to the injection position as the disc rotates. The injection head of the injection mechanism, located above the disc, connects with the injection port of the mold and injects molten plastic into the mold cavity under high pressure. Additionally, to ensure the disc's levelness during rotation, a friction disc is usually installed below the disc for support.

[0004] However, due to the significant axial clamping force and injection pressure during injection molding, this force is typically transmitted through the mold to the disc, and then from the disc to the supporting structure below. Therefore, the disc not only performs the function of rotational indexing but also needs to withstand periodic off-center loading during injection molding. For example, when injection is being performed at a certain station, the pressure of the injection mold on the disc at that location increases, causing a noticeable uneven stress on the disc. This leads to increased local compressive stress and friction on the disc, resulting in accelerated wear of the supporting parts. Over time, this may also cause slight tilting or vibration of the disc. For injection molding equipment, this slight wear or misalignment is amplified into a process problem, affecting not only product quality but also potentially causing additional wear to the mold and injection head. Summary of the Invention

[0005] The purpose of this invention is to provide an injection molding machine turntable mechanism and an injection molding machine, which solves the problem that the disc in existing injection molding equipment is prone to increased wear and tear on the disc and support structure due to increased local compressive stress caused by injection molding.

[0006] To achieve this objective, the present invention adopts the following technical solution: A rotary table mechanism for an injection molding machine is provided on the main body of the injection molding machine. The rotary table mechanism includes a support base, a rotating shaft on the support base, and a disc seat on the support base that rotates through the rotating shaft. A plurality of mold mounting positions are symmetrically arranged around the center on the disc seat. The rotary table mechanism also includes a drive assembly and a support assembly disposed between the disc seat and the support base. The drive assembly includes an internal gear ring connected to the lower end face of the disk base and a drive gear meshing with the internal gear ring. The internal gear ring is coaxially arranged with the disk base, and the drive gear drives the disk base to rotate. The support assembly includes at least a pad arranged on the bearing seat and an adjustment part connected to the pad. Multiple pads are arranged at intervals around the rotating shaft. The upper end face of the pad is configured as an abutment surface. The adjustment part is used to adjust the size of the abutment surface according to the pressure state at the mold mounting position of the disc seat, so as to always maintain horizontal support for the disc seat.

[0007] Optionally, the pad includes a reference block and a ring sleeve movably sleeved on the outside of the reference block. At least two ring sleeves are provided, and multiple ring sleeves can be raised and lowered sequentially from the outside to the inside. When the upper surface of the ring sleeve is flush with the upper surface of the reference block, they together form the abutting surface.

[0008] Optionally, the adjustment unit includes a base, a drive seat, and a first motor fixedly connected to the bottom of the ring sleeve. The drive seat abuts against the base of each ring sleeve. The drive seat is provided with a wedge block, and the base has a groove that matches the wedge block. The drive seat is connected to the output shaft of the first motor.

[0009] Optionally, the upper end face of the reference block is provided with a receiving cavity, and a rolling element is rotatably disposed in the receiving cavity. The rolling element is used to make rolling contact with the lower surface of the disc seat.

[0010] Optionally, a pressure sensor is provided at the mold mounting position of the disc base. When the pressure at any mold mounting position on the disc base increases, the adjustment part adjusts the ring at the corresponding position to raise or lower, so as to change the effective contact area of ​​the abutment surface. The change in the effective contact area of ​​the abutment surface is negatively correlated with the magnitude of the pressure at the mold mounting position of the disc seat.

[0011] Optionally, the bearing seat has an annular groove, the internal gear ring is embedded in the annular groove, and the internal gear ring is fixedly connected to the disc seat. A support roller is provided at the bottom of the annular groove, and the support roller abuts against the internal gear ring.

[0012] Optionally, the turntable mechanism further includes a positioning component, the positioning component comprising: A positioning seat is connected to the disc seat, and the bottom of the positioning seat has a positioning slot; A positioning rod is connected to the bearing seat. When the disc seat rotates to a preset position, the positioning rod is inserted into the positioning slot.

[0013] Optionally, it also includes a limiting component, the limiting component comprising: A limiting ring is movably connected to the bearing seat, and the limiting ring has a semi-ring structure. The limiting rod is fixedly connected to the bottom of the disc base; During the rotation of the disc seat, the limiting ring is in a descending state. When the disc seat rotates to a preset position, the limiting ring rises and cooperates with the limiting rod to limit the rotation angle of the disc seat.

[0014] This invention also provides an injection molding machine, including the injection molding machine turntable mechanism as described above. The injection molding machine further includes a machine base body and an injection mechanism. The turntable mechanism is disposed on the machine base body, and the injection mechanism is disposed above the turntable mechanism.

[0015] Optionally, the injection molding mechanism includes an upper mold base and an injection stage disposed on the upper mold base, the injection stage being connected to an injection head, the injection head facing the disc base; the injection molding machine further includes a lifting cylinder for driving the upper mold base to move up and down and a molding cylinder for controlling the injection state of the injection stage.

[0016] Compared with the prior art, the present invention has the following beneficial effects: In the injection molding machine turntable mechanism provided in this embodiment of the invention, the rotating disc seat is driven by the meshing transmission of the drive gear and the internal gear ring, causing different molds to rotate sequentially to the injection station, thereby completing continuous injection molding operations. By arranging multiple pads in a ring around the rotating shaft below the disc seat, the disc seat can always maintain a high degree of flatness and stability. The size of the pad contact surface can be dynamically adjusted according to the force conditions of different mold mounting positions, so that the force on each support point tends to be balanced, thereby effectively reducing the problem of uneven load caused by increased local load. At the same time, changing the contact surface area of ​​the pads disperses the contact pressure in high-load areas, reducing the sliding friction between the disc seat and the support components, thereby significantly reducing the wear of the disc seat and extending the overall service life of the equipment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0019] Figure 1 This is a schematic diagram of the overall structure of an injection molding machine.

[0020] Figure 2 This is a partial structural diagram of an injection molding machine.

[0021] Figure 3 This is an exploded view of the turntable mechanism.

[0022] Figure 4 This is a top view of the turntable mechanism.

[0023] Figure 5 This is a structural cross-sectional view of the turntable mechanism.

[0024] Figure 6 This is a schematic diagram of the pad block structure.

[0025] Figure 7 This is a cross-sectional view of the pad block.

[0026] Illustrations: 100, Machine body; 200, Injection molding mechanism; 300, Turntable mechanism; 1, Bearing seat; 11, Annular groove; 2, Rotating shaft; 3, Disc seat; 4, Drive assembly; 41, Internal gear ring; 42, Drive gear; 5, Support assembly; 51, Pad block; 511, Reference block; 512, Ring sleeve; 52, Adjustment part; 521, Base; 522, Drive seat; 523, First motor; 53, Rolling element; 6, Positioning seat; 7, Positioning rod; 8, Limiting ring; 9, Limiting rod. Detailed Implementation

[0027] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0028] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1: like Figures 1-7 As shown, this embodiment of the invention provides an injection molding machine turntable mechanism for continuous injection molding in disc-type injection molding equipment. Addressing the shortcomings of existing injection molding equipment where increased local compressive stress on the disc during injection leads to accelerated wear, this embodiment of the invention aims to provide an injection molding machine turntable mechanism that effectively reduces wear on the disc and support structure and is less susceptible to the effects of disc compressive stress through structural improvements.

[0031] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, in this embodiment, the injection molding machine turntable mechanism is mounted on the machine body 100 of the injection molding machine. The turntable mechanism 300 includes a support base 1, a rotating shaft 2 mounted on the support base 1, and a disc base 3 rotatably mounted on the support base 1 via the rotating shaft 2. Multiple mold mounting positions are symmetrically arranged around the center on the disc base 3. The turntable mechanism 300 also includes a drive assembly 4 and a support assembly 5 disposed between the disc base 3 and the support base 1. The drive assembly 4 includes an internal gear ring 41 connected to the lower end face of the disc base 3 and a support assembly 5 connected to the internal gear ring 41. The drive gear 42 meshes with the internal gear ring 41 and is coaxially arranged with the disc seat 3. The drive gear 42 drives the disc seat 3 to rotate. The support assembly 5 includes at least a pad 51 arranged on the bearing seat 1 and an adjustment part 52 connected to the pad 51. Multiple pads 51 are arranged at intervals around the rotating shaft 2. The upper end surface of the pad 51 is configured as an abutment surface. The adjustment part 52 is used to adjust the size of the abutment surface according to the pressure state at the mold mounting position of the disc seat 3 so as to always maintain horizontal support for the disc seat 3.

[0032] Specifically, the support base 1 is fixedly mounted on the injection molding machine platform, serving as the mounting base for the turntable mechanism 300. The rotating shaft 2 is vertically mounted on the support base 1, preferably rotatably connected to it via a bearing structure to ensure stability and coaxiality during rotation. The disc base 3 is rotatably mounted on the support base 1 via the rotating shaft 2, and rotates around the center of the rotating shaft 2. Multiple mold mounting positions are evenly spaced around the center of the disc base 3, each capable of housing an injection mold for multi-station cyclic operation. In actual operation, rotating the disc base 3 causes different molds to sequentially rotate to the injection station, thus completing continuous injection molding.

[0033] The drive assembly 4 is disposed between the disc base 3 and the support base 1, and is used to drive the disc base 3 to rotate. The drive assembly 4 includes an internal gear ring 41 fixedly connected to the lower end face of the disc base 3, and a drive gear 42 meshing with the internal gear ring 41. The internal gear ring 41 is coaxially arranged with the disc base 3, and the diameter of the internal gear ring 41 can be less than or equal to the diameter of the disc base 3, so that the diameter of the internal gear ring 41 is close to the diameter of the disc base 3, which can improve the tooth density of the internal gear ring 41 and help improve the rotation accuracy of the disc base 3. The drive gear 42 can be driven to rotate by a motor, and through meshing with the internal gear ring 41, it drives the disc base 3 to rotate around the rotating shaft 2. The internal gear ring 41 is arranged inside or below the disc base 3, so the drive gear 42 and the motor can be placed below the disc base 3, thereby reducing the overall height and improving the structural compactness.

[0034] A support assembly 5 is disposed between the disc base 3 and the support seat 1 to provide auxiliary support for the disc base 3. The support assembly 5 includes at least a plurality of pads 51 and an adjustment part 52 connected to the pads 51. The plurality of pads 51 are arranged in a ring at intervals around the rotating shaft 2 on the support seat 1, and the upper end surface of each pad 51 forms an abutment surface for abutting against the lower surface of the disc base 3 to achieve horizontal support for the disc base 3. In addition, located directly below the injection molding station, the density of the pads 51 can be greater than that in other locations, which can effectively cope with the weight changes of the injection mold during injection molding.

[0035] By arranging multiple pads 51 in a ring around the rotating shaft 2 below the disc base 3, the disc base 3 can always maintain a high degree of flatness and stability. The size of the contact surface of the pads 51 can be dynamically adjusted according to the stress conditions of different mold installation positions, so that the stress of each support point tends to be balanced, thereby effectively reducing the problem of uneven load caused by increased local load. At the same time, changing the contact surface area of ​​the pads 51 disperses the contact pressure in the high-load area, reduces the sliding friction between the disc base 3 and the support component 5, thereby significantly reducing the wear of the disc base 3 and extending the overall service life of the equipment.

[0036] like Figure 5 , Figure 6 and Figure 7As shown, in this embodiment of the invention, the pad 51 includes a reference block 511 and a ring 512 movably sleeved on the outside of the reference block 511. At least two rings 512 are provided, and multiple rings 512 can be raised and lowered sequentially from the outside to the inside. When the upper surface of the ring 512 is flush with the upper surface of the reference block 511, they together form an abutting surface.

[0037] Specifically, the pad 51 includes a reference block 511 located at the center and multiple rings 512 movably sleeved on the outside of the reference block 511. The rings 512 are coaxially arranged ring structures, concentrically distributed around the reference block 511, and each ring 512 forms a nested structure from the outside in, and can be raised and lowered independently or in conjunction with the reference block 511 in the vertical direction. For example, two rings 512 are provided to form a multi-level support structure. The upper end surfaces of the two rings 512 are basically flush with the upper end surface of the reference block 511 in the initial state, thus forming a complete contact surface for contacting the lower surface of the disc base 3 and providing support.

[0038] For example, to ensure that the upper surface of the ring 512 is flush with the upper surface of the reference block 511, the diameters of the reference block 511 and the ring 512, as well as the inner and outer rings 512, can be set to a matching stepped structure, so that the height of the upper surface of the ring 512 will not be higher than the height of the upper surface of the reference block 511, thus ensuring the flatness and stability of the support for the disc seat 3.

[0039] During operation, when no adjustment is needed or the force on the disc seat 3 is relatively uniform, each ring 512 remains in an upward state, forming a larger support area together with the reference block 511 to improve overall support stability. When the pressure on the disc seat 3 at a certain position increases, under the action of the adjustment part 52, the outer ring 512 moves downward first, so that its upper end surface is lower than the upper end surface of the reference block 511, thereby withdrawing from contact with the disc seat 3. As the force changes further, the inner ring 512 can continue to descend sequentially, realizing graded adjustment of the contact surface area from large to small. This allows the contact surface of the pad block 51 to switch between multiple discrete areas, forming a stepped adjustable support method, thereby adapting to force changes under different working conditions. In addition, since the multiple rings 512 are arranged concentrically, the central support function of the reference block 511 will not be affected during the lifting and lowering process, ensuring the continuity and stability of the support and avoiding significant shaking of the disc seat 3 due to the disappearance of local support.

[0040] Furthermore, the adjustment unit 52 includes a base 521, a drive seat 522, and a first motor 523 fixedly connected to the bottom of the ring 512. The drive seat 522 is in contact with the base 521 of each ring 512. The contact surface between the drive seat 522 and the base 521 is an inclined surface. The base 521 has an inclined surface that matches the inclined surface of the drive seat 522. The drive seat 522 is connected to the output shaft of the first motor 523.

[0041] Specifically, each ring 512 has a base 521 fixedly connected to its bottom, and the base 521 moves synchronously with the ring 512. A drive seat 522 is positioned below the multiple bases 521 and contacts each base 521. A wedge block can be fixedly mounted on the end face of the drive seat 522 opposite to the base 521, with both sides of the wedge block being inclined surfaces. A groove matching the wedge block is provided on the end face of the base 521 opposite to the drive seat 522. When the first motor 523 drives the drive seat 522 to rotate, the wedge block aligns with the groove, allowing it to embed into the groove, thus lowering the height of the base 521 and the ring 512. By allocating the positions of the grooves on the base 521 of each ring 512 and the wedge blocks on the drive seat 522, the multiple rings 512 can be raised and lowered progressively from the outside in. The adjustment unit 52 has a centralized overall structure, reducing the number of parts and assembly space requirements.

[0042] Furthermore, a receiving cavity is provided on the upper end face of the reference block 511, and a rolling element 53 is rotatably arranged in the receiving cavity. The rolling element 53 is used to roll and contact with the lower surface of the disc seat 3.

[0043] Specifically, the receiving cavity is an upward-opening recessed structure, the size of which matches the rolling element 53. The rolling element 53 is housed within the receiving cavity and can rotate freely or relative to it. For example, the rolling element 53 can be a spherical structure located on the upper surface of the reference block 511. At the beginning of the receiving cavity, a recessed portion with gradually increasing depth can be formed, communicating with the receiving cavity. This allows part of the rolling element 53 to protrude beyond the upper surface of the reference block 511, enabling it to directly contact the lower surface of the disc seat 3. During the rotation of the disc seat 3, the rolling element 53 rolls within the receiving cavity, forming a rolling contact relationship with the disc seat 3, thereby significantly reducing frictional resistance and improving the smoothness of the turntable's rotation.

[0044] During actual operation, when the disc seat 3 rotates or undergoes slight displacement due to force, the rolling element 53 can roll accordingly, thereby transforming the original sliding friction into rolling friction. This effectively reduces the frictional resistance of the contact surface, avoids localized wear caused by long-term sliding friction, and thus extends the service life of the reference block 511 and the disc seat 3. Simultaneously, because the rolling element 53 involves point contact or small-area contact, it can also adapt to slight tilt changes in the disc seat 3, improving the support's self-adaptive capability, reducing vibration or shaking caused by localized jamming or uneven friction, and enhancing the stability of the turntable's operation.

[0045] like Figure 3 , Figure 4 and Figure 5 As shown, in this embodiment of the invention, a pressure sensor is provided at the mold mounting position of the disc base 3. When the pressure at any mold mounting position on the disc base 3 increases, the adjustment part 52 adjusts the ring 512 at the corresponding position to raise or lower, so as to change the effective contact area of ​​the contact surface. The amount of change in the effective contact area of ​​the contact surface is negatively correlated with the magnitude of the pressure at the mold mounting position of the disc base 3.

[0046] Specifically, pressure sensors are installed at multiple mold mounting positions on the disc base 3. These pressure sensors are used to detect the force on the corresponding mold mounting position in real time. The pressure sensors can be embedded inside the disc base 3 or installed below the mold mounting position and are electrically connected to the control system. The control system is electrically connected to each pressure sensor and the adjustment unit 52, and is used to receive pressure signals from each mold mounting position and control the adjustment unit 52 at the corresponding position to operate based on the detected force changes.

[0047] During operation, when the pressure at a mold mounting position increases due to increased mold weight or pressure generated during injection molding, the pressure sensor feeds this signal back to the control system. The control system, based on preset control logic, drives the first motor 523 at the corresponding position, causing the drive seat 522 to shift. This, in turn, lowers the ring 512 of the corresponding pad 51, reducing the effective contact area of ​​the pad 51's contact surface. Conversely, when the pressure at a mold mounting position decreases, the control system controls the adjustment unit 52 to raise the corresponding ring 512, increasing the contact surface area. Through this method, the change in the contact surface area of ​​each pad 51 is negatively correlated with the magnitude of the pressure at the corresponding mold mounting position; that is, the greater the force, the smaller the contact area; and the smaller the force, the larger the contact area. This achieves dynamic adjustment of the support state, effectively balancing the forces at each support point and preventing the disc seat 3 from tilting due to excessive local load, thereby improving overall operational stability.

[0048] For example, the bearing seat 1 has an annular groove 11, the inner gear ring 41 is embedded in the annular groove 11, and the inner gear ring 41 is fixedly connected to the disc seat 3. A support roller is provided at the bottom of the annular groove 11, and the support roller abuts against the inner gear ring 41.

[0049] Specifically, the annular groove 11 is coaxially arranged around the rotating shaft 2, and its shape matches the internal gear ring 41. The internal gear ring 41 is embedded in the annular groove 11 and fixedly connected to the disc seat 3 by bolts, so that the internal gear ring 41 rotates synchronously with the disc seat 3. The internal gear ring 41 is at least partially embedded in the bearing seat 1, thereby reducing the installation height of the internal gear ring 41, improving the compactness of the overall structure, and providing a certain radial limiting effect on the internal gear ring 41 to prevent it from radially deviating during the stress process. Multiple support rollers are circumferentially spaced at the bottom of the annular groove 11. The support rollers are rotatably mounted on the bearing seat 1, and their axes are preferably arranged radially. The outer circumferential surface of the support rollers abuts against the lower surface of the internal gear ring 41.

[0050] In actual operation, when the drive gear 42 drives the internal gear ring 41 to rotate, the lower surface of the internal gear ring 41 is supported by the support rollers while rotating. The support rollers roll along with the movement of the internal gear ring 41, thereby changing the contact between the internal gear ring 41 and the bearing seat 1 from sliding friction to rolling friction. Furthermore, since multiple support rollers are evenly arranged along the annular groove 11, they can provide uniform circumferential support to the internal gear ring 41, effectively distributing the load generated by the disc seat 3 and the mold on it, and reducing local stress concentration.

[0051] In one embodiment of the present invention, the turntable mechanism 300 further includes a positioning component, which includes a positioning seat 6 and a positioning rod 7. The positioning seat 6 is connected to the disc seat 3, and the bottom of the positioning seat 6 has a positioning slot; the positioning rod 7 is connected to the support seat 1, and when the disc seat 3 rotates to a preset position, the positioning rod 7 is inserted into the positioning slot.

[0052] Specifically, the positioning seat 6 is fixedly connected to the lower part of the disc seat 3, preferably positioned near the edge of the disc seat 3 to increase the positioning radius and thus improve positioning accuracy. A positioning slot is provided at the bottom of the positioning seat 6; the positioning slot is a blind hole structure, and its size matches that of the positioning rod 7. The positioning rod 7 is mounted on the support seat 1 and is vertically extendable, for example, driven by a cylinder, electric push rod, or hydraulic cylinder, allowing it to switch between extended and retracted states. The upper end of the positioning rod 7 is the insertion end, which can be cylindrical, conical, or have a guide chamfer to facilitate smooth insertion into the positioning slot.

[0053] During the actual operation, when the drive assembly 4 drives the disc seat 3 to rotate to the preset position of the target station, the control system controls the positioning rod 7 to extend upward from the retracted state and insert it into the corresponding positioning slot, thereby locking the position of the disc seat 3 to limit further rotation of the disc seat 3, ensuring accurate alignment between the mold mounting position and the injection molding mechanism 200, thereby improving injection molding quality and reducing product defects caused by misalignment; when the next step of indexing is required, the positioning rod 7 retracts out of the positioning slot first, and then the drive assembly 4 drives the disc seat 3 to continue rotating.

[0054] Furthermore, the turntable mechanism 300 also includes a limiting component, which includes a limiting ring 8 and a limiting rod 9. The limiting ring 8 is movably connected to the support base 1 and has a semi-ring structure; the limiting rod 9 is fixedly connected to the bottom of the disc base 3; wherein, during the rotation of the disc base 3, the limiting ring 8 is in a descending state, and when the disc base 3 rotates to a preset position, the limiting ring 8 rises and cooperates with the limiting rod 9 to limit the rotation angle of the disc base 3.

[0055] Specifically, the limiting ring 8 is movably connected to the support base 1 and can switch between the raised and lowered states via a cylinder, electric push rod, or elastic reset structure. The limiting ring 8 has a semi-ring structure, and its opening direction and curvature match the rotation path of the disc base 3, and it is set around the outer side of the rotating shaft 2. The limiting rod 9 is fixedly connected to the bottom of the disc base 3. The limiting rod 9 can be a columnar structure, and its position corresponds to the working area of ​​the limiting ring 8.

[0056] During operation, when the disc base 3 rotates under the drive of the drive assembly 4, the limiting ring 8 is in a lowered state to avoid interference with the limiting rod 9, thus ensuring smooth rotation of the disc base 3. When the disc base 3 approaches the preset target position, the control system controls the limiting ring 8 to rise, bringing it into the working position. As the disc base 3 continues to rotate, the limiting rod 9 gradually enters the arc range of the limiting ring 8 and eventually contacts the limiting ring 8, thereby limiting the rotation angle of the disc base 3 and stopping it within the range close to the target position, achieving initial limiting. After initial limiting, the positioning rod 7 in the positioning assembly extends and inserts into the positioning slot to achieve precise positioning of the disc base 3.

[0057] Example 2: like Figure 1 , Figure 2 , Figure 3As shown in the figure, this embodiment of the invention also provides an injection molding machine, including the injection molding machine turntable mechanism described above, as well as a machine base body 100 and an injection molding mechanism 200. The turntable mechanism is disposed on the machine base body 100, and the injection molding mechanism 200 is disposed above the turntable mechanism. The injection molding mechanism 200 is disposed above the turntable mechanism 300 and is arranged vertically corresponding to the turntable base 300. By disposing the injection molding mechanism 200 above the turntable mechanism 300, the injection head operates from top to bottom, reducing the height of the turntable mounting surface and facilitating mold installation, replacement, and maintenance by operators.

[0058] Furthermore, the injection molding mechanism 200 includes an upper mold base and an injection station mounted on the upper mold base. The injection station is connected to an injection head, which faces the disc base 3. The injection molding machine also includes a lifting cylinder for driving the upper mold base to move up and down and a molding cylinder for controlling the injection state of the injection station.

[0059] Specifically, the main body 100 serves as the basic structure of the entire machine, supporting the turntable mechanism 300 and the injection molding mechanism 200. The turntable mechanism 300 is installed on the upper part of the main body 100, and its disc base 3 can rotate intermittently or continuously around the rotating shaft 2. Multiple mold mounting positions are provided on the disc base 3 for installing injection molds, and during the rotation, they rotate sequentially to the injection molding station.

[0060] The injection molding mechanism 200 includes an upper mold base and an injection station mounted on the upper mold base. An injection head is connected to the injection station, oriented towards the mold mounting position of the disc base 3, to align with the injection port of the mold for injection molding. The injection molding machine also includes a lifting cylinder, which drives the upper mold base to move vertically up and down. During operation, when a mold mounting position rotates to the injection station, the lifting cylinder drives the upper mold base downwards, bringing the injection head closer to and aligning it with the corresponding mold, achieving mold closing or near-injection. After injection, the lifting cylinder drives the upper mold base upwards, separating the injection head from the mold, allowing the disc base 3 to perform the next rotation, enabling multi-station cyclic operation. While one station is performing injection, other stations can perform cooling or part removal, significantly improving production efficiency.

[0061] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotary table mechanism for an injection molding machine, disposed on the main body (100) of the injection molding machine, characterized in that, The turntable mechanism (300) includes a support base (1), a rotating shaft (2) disposed on the support base (1), and a disc seat (3) rotatably disposed on the support base (1) via the rotating shaft (2). The disc seat (3) has a plurality of mold mounting positions symmetrically arranged around the center. The turntable mechanism (300) also includes a drive assembly (4) and a support assembly (5) disposed between the disc seat (3) and the support base (1). The drive assembly (4) includes an internal gear ring (41) connected to the lower end face of the disk seat (3) and a drive gear (42) meshing with the internal gear ring (41). The internal gear ring (41) is coaxially arranged with the disk seat (3) and drives the disk seat (3) to rotate through the drive gear (42). The support assembly (5) includes at least a pad (51) arranged on the bearing seat (1) and an adjustment part (52) connected to the pad (51). Around the rotating shaft (2), a plurality of pads (51) are arranged at intervals. The upper end surface of the pad (51) is configured as an abutment surface. The adjustment part (52) is used to adjust the size of the abutment surface according to the pressure state at the mold mounting position of the disc seat (3) so as to always maintain horizontal support for the disc seat (3).

2. The injection molding machine turntable mechanism according to claim 1, characterized in that, The pad (51) includes a reference block (511) and a ring (512) movably sleeved on the outside of the reference block (511). There are at least two rings (512), and multiple rings (512) can be raised and lowered sequentially from the outside to the inside. When the upper surface of the ring (512) is flush with the upper surface of the reference block (511), they together form the abutment surface.

3. The injection molding machine turntable mechanism according to claim 2, characterized in that, The adjustment unit (52) includes a base (521), a drive seat (522), and a first motor (523) fixedly connected to the bottom of the ring (512). The drive seat (522) abuts against the base (521) of each ring (512). A wedge is provided on the drive seat (522), and a groove matching the wedge is provided on the base (521). The drive seat (522) is connected to the output shaft of the first motor (523).

4. The injection molding machine turntable mechanism according to claim 2, characterized in that, The upper surface of the reference block (511) is provided with a receiving cavity, and a rolling element (53) is rotatably arranged in the receiving cavity. The rolling element (53) is used to roll and contact with the lower surface of the disc seat (3).

5. The injection molding machine turntable mechanism according to claim 3, characterized in that, A pressure sensor is provided at the mold mounting position of the disc base (3). When the pressure at any mold mounting position on the disc base (3) increases, the adjustment part (52) adjusts the ring (512) at the corresponding position to rise and fall, so as to change the effective contact area of ​​the abutment surface. The change in the effective contact area of ​​the contact surface is negatively correlated with the magnitude of the pressure at the mold mounting position of the disc seat (3).

6. The injection molding machine turntable mechanism according to claim 2, characterized in that, The bearing seat (1) has an annular groove (11) and the internal gear ring (41) is embedded in the annular groove (11). The internal gear ring (41) is fixedly connected to the disc seat (3). A support roller is provided at the bottom of the annular groove (11) and the support roller abuts against the internal gear ring (41).

7. The injection molding machine turntable mechanism according to claim 1, characterized in that, The turntable mechanism (300) further includes a positioning component, the positioning component comprising: A positioning seat (6) is connected to the disc seat (3), and the bottom of the positioning seat (6) has a positioning slot; The positioning rod (7) is connected to the bearing seat (1). When the disc seat (3) rotates to the preset position, the positioning rod (7) is inserted into the positioning slot.

8. The injection molding machine turntable mechanism according to claim 7, characterized in that, It also includes a limiting component, the limiting component comprising: A limiting ring (8) is movably connected to the bearing seat (1), and the limiting ring (8) is a semi-ring structure; The limiting rod (9) is fixedly connected to the bottom of the disc base (3); During the rotation of the disc seat (3), the limiting ring (8) is in a descending state. When the disc seat (3) rotates to a preset position, the limiting ring (8) rises and cooperates with the limiting rod (9) to limit the rotation angle of the disc seat (3).

9. An injection molding machine, characterized in that, The injection molding machine includes a turntable mechanism as described in any one of claims 1-8, and the injection molding machine further includes a machine base body (100) and an injection mechanism (200), wherein the turntable mechanism (300) is disposed on the machine base body (100) and the injection mechanism (200) is disposed above the turntable mechanism (300).

10. The injection molding machine according to claim 9, characterized in that, The injection molding mechanism (200) includes an upper mold base and an injection station disposed on the upper mold base. The injection station is connected to an injection head, which faces the disc base (3). The injection molding machine also includes a lifting cylinder for driving the upper mold base to move up and down and a molding cylinder for controlling the injection state of the injection station.

Images