A new type of servo rotary table

Abstract

The utility model relates to a novel servo rotary workbench belongs to mould processing equipment technical field, including installation base, the top of installation base is equipped with the drive platform, the top of drive platform is opened with the movable slot, the inboard wall of movable slot is equipped with a plurality of polar axis array distribution's hydraulic oil cylinder, a plurality of hydraulic oil cylinder's top fixed connection has the turntable bearing that connects, the outer side wall of turntable bearing is movably sleeved with turntable drive gear ring, the top fixed mounting of turntable drive gear ring has turntable body, when needing to bear the closing pressure, hydraulic oil cylinder retracts, turntable body bottom and drive platform top close contact, the force surface expands from the local contact of turntable bearing to the overall contact of turntable body and drive platform, and the closing pressure is evenly passed to installation base through drive platform, avoids the abrasion and the shortened life problem that turntable bearing produces because of long -term bearing high pressure, widens the application range of servo rotary workbench.

Description

Technical Field

[0001] This utility model belongs to the technical field of mold processing equipment, specifically relating to a novel servo rotary worktable. Background Technology

[0002] With the gradual phasing out of spray painting processes for plastic parts, the demand for multi-color injection molding is growing rapidly. As a result, both the output and weight of two-color and three-color plastic molds are increasing rapidly. Currently, the largest injection molds weigh around 40 tons. As a key piece of equipment for realizing multi-station processing or positioning of workpieces, the performance of rotary worktables directly affects production efficiency and product precision. However, existing rotary worktables have many technical pain points in practical applications, making it difficult to meet the production needs of high precision and high efficiency.

[0003] In terms of positioning and locking, traditional rotary tables mostly use manual locking or single-cylinder locking. Manual locking is not only cumbersome and labor-intensive, but also difficult to control the locking force evenly, which can easily lead to the rotation table's positioning deviation and affect machining accuracy. Although single-cylinder locking achieves automated operation, single-point force can easily cause local deformation of the rotation table, especially when bearing heavy workpieces. The locking stability is poor, and loosening often occurs during workstation switching, which seriously restricts the improvement of production efficiency. In traditional designs, the tooth thickness of the drive gear and the rotation table gear ring is often designed to be the same, and the gear ring is only fixed to the bottom of the rotation table with simple bolts. It lacks precise positioning constraints. When the clearance is too large, the gear rotation is prone to "free-spinning-impact" phenomenon, causing the rotation table axis to shift. When the clearance is too small, the tooth surface Increased frictional resistance can easily cause gear jamming, forcing the turntable to "forcefully offset" to alleviate friction. This ultimately leads to periodic eccentricity during turntable rotation, affecting the positional accuracy of the workpiece machining surface. Traditional worktables typically have 2-4 symmetrically distributed support cylinders instead of being evenly arranged around the turntable axis. When the turntable bears an eccentric load or is subjected to mold closing pressure, the support force cannot be evenly transmitted to the bottom of the turntable—the support cylinder on the heavier side experiences excessive force, while the other side experiences insufficient force, causing the turntable to tilt and form eccentric deformation. Therefore, those skilled in the art have provided a novel servo rotary worktable to solve the aforementioned problems. Utility Model Content

[0004] The purpose of this invention is to provide a new type of servo rotary table with a simple structure and reasonable design in order to solve the above problems.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: A novel servo rotary table includes a mounting base, a drive platform mounted on the top of the mounting base, a movable groove formed on the top of the drive platform, a plurality of hydraulic cylinders arranged in a polar axis array mounted on the inner side wall of the movable groove, a turntable bearing fixedly connected to the top of the plurality of hydraulic cylinders, the turntable bearing being vertically slidably connected to the inner side wall of the movable groove, a turntable drive gear ring fixedly sleeved on the outer side wall of the turntable bearing, a turntable body rotatably connected to the top of the drive platform fixedly mounted on the top of the turntable drive gear ring, a drive gear meshing with the side wall of the turntable drive gear ring, a servo motor disposed inside the mounting base, and the output end of the servo motor being fixedly connected to the bottom of the drive gear.

[0006] As a further optimization of this utility model, the inner sidewall of the mounting base is provided with a mounting grid, and the servo drive motor is fixedly installed inside the mounting grid.

[0007] As a further optimization of this utility model, a locking cylinder is fixedly installed in the middle of the inner side wall of the mounting grid, and the output end of the locking cylinder passes through the top of the drive platform and is rotatably connected to the bottom of the turntable body.

[0008] As a further optimization of this utility model, positioning cylinders are fixedly installed on both sides of the middle of the inner sidewall of the mounting grid, and positioning cylinders that penetrate the inner sidewall of the drive platform and are engaged in the positioning groove at the bottom of the turntable body are fixedly installed at the output ends of the two positioning cylinders.

[0009] As a further optimization of this utility model, the bottom of the drive platform is provided with several positioning holes that connect to the top of the mounting base.

[0010] As a further optimization of this utility model, mounting grooves are provided at the four corners of the bottom of the mounting base, and the inner sidewalls of the mounting grooves are rotatably connected to movable wheels that fit against the ground.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. This utility model achieves flexible switching of load-bearing mode through the collaborative structure of hydraulic cylinder and turntable bearing: when it is necessary to bear the mold closing pressure, the hydraulic cylinder retracts, the bottom of the turntable body is tightly fitted with the top of the drive platform, and the force-bearing surface expands from the partial contact of the turntable bearing to the full contact of the turntable body and the drive platform. The mold closing pressure is evenly transmitted to the mounting base through the drive platform, avoiding the wear and shortened life of the turntable bearing due to long-term high pressure, and greatly expanding the application range of the servo rotary table.

[0013] 2. In this utility model, a hydraulic cylinder with a polar axis array is installed inside the turntable bearing. During rotation, the hydraulic cylinder extends and lifts the turntable bearing, creating a gap between the turntable body and the drive platform. When the turntable drive gear ring drives the turntable body to rotate around the turntable bearing, pure rolling friction is achieved entirely by relying on the rolling elements inside the bearing. Rolling friction significantly reduces wear between components, extending the service life of the turntable bearing and the turntable drive gear ring. When the hydraulic cylinder extends and lifts the turntable bearing, a gap is formed between the turntable body and the top of the drive platform. When the turntable drive gear ring rotates around the turntable bearing, the rolling elements inside the turntable bearing convert "sliding friction" into "rolling friction." The coefficient of rolling friction is much lower than that of sliding friction, which can significantly reduce the resistance during turntable rotation. This allows the servo drive motor to drive the turntable to rotate smoothly without outputting excessive power, reducing the energy consumption during motor operation. The energy saving effect is even more significant, especially in high-frequency rotation processing scenarios.

[0014] 3. This utility model features a composite positioning and locking system of "dual positioning cylinders + servo motors," which provides multiple precision guarantees: First, the positioning cylinders are installed on both sides of the inner wall of the servo drive motor. After the turntable body rotates to the designated position, the output end extends and abuts against the bottom of the turntable body to achieve "pre-positioning" and offset the error caused by the fluctuation of the motor speed; Second, the output end of the servo motor itself has a positioning function, which improves the accuracy of the rotation angle of the turntable body.

[0015] 4. In this utility model, the hydraulic cylinders in the drive platform's movable slot are distributed in a "polar axis array" (i.e., evenly arranged around the axis of the turntable bearing). When the hydraulic cylinders extend to lift the turntable bearing, multiple cylinders can provide uniform upward support from the bottom of the turntable bearing. Even if the workpiece's center of gravity is eccentric, the evenly distributed support points can distribute the eccentric load to each cylinder, avoiding turntable tilting caused by excessive force on a single support point. Simultaneously, the polar axis array design ensures that the support force is always symmetrically distributed around the axis during the turntable's rotation, reducing rotational eccentricity caused by uneven support. When the mold closing pressure is applied, the hydraulic cylinder retracts, and the bottom of the turntable body fits tightly against the top of the drive platform. At this time, the force-bearing surface changes from "point support" to "surface contact". The mold closing pressure is evenly transmitted to the drive platform through the entire bottom surface of the turntable body, and then to the ground through the mounting base. This avoids the eccentric deformation of the turntable caused by the traditional "local force". In addition, the mounting base, as the overall foundation support, is firmly connected to the drive platform by bolts. Its own structure has high rigidity and can further resist the eccentric stress under the mold closing pressure, ensuring that the worktable remains stable in high-pressure processing scenarios (such as mold closing of heavy workpieces). Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembly structure of this utility model;

[0017] Figure 2This is a schematic diagram of the bottom structure of this utility model;

[0018] Figure 3 This is a partial top-view axial side view of the structure of this utility model;

[0019] Figure 4 This is a partial cross-sectional view of the present invention;

[0020] Figure 5 This is a schematic diagram of the assembly structure of the turntable and turntable bearing of this utility model.

[0021] In the diagram: 1. Mounting base; 2. Drive platform; 3. Mounting slot; 4. Moving wheel; 5. Locking cylinder; 6. Positioning cylinder; 7. Servo drive motor; 8. Mounting grid; 9. Turntable drive gear ring; 10. Turntable bearing; 11. Turntable body; 12. Turning slot; 13. Hydraulic cylinder; 14. Drive gear; 15. Positioning hole; 16. Positioning cylinder. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the specific embodiments described below are only for further explanation of the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above content.

[0023] Example 1

[0024] like Figure 1 , Figure 2 As shown, a novel servo rotary table includes a mounting base 1, which serves as the basic support component of the entire table. Its top is bolted to the drive platform 2 to ensure the firmness of the connection and provide a stable foundation for the subsequent installation of other components. At the four corners of the bottom of the mounting base 1, there are mounting grooves 3. The inner sidewall of each mounting groove 3 is rotatably connected to a moving wheel 4 through a rotating shaft. The bottom of the moving wheel 4 is in close contact with the ground. By rolling the moving wheel 4, the entire servo rotary table can be easily moved to meet the layout requirements of different working scenarios.

[0025] like Figure 1 , Figure 2 , Figure 3As shown, a mounting grid 8 matching the size of the servo drive motor 7 is provided on the inner wall of the mounting base 1. The servo drive motor 7 is fixedly mounted on the inner wall of the mounting grid 8 by bolts to ensure that the servo drive motor 7 will not shift position during operation. The output end of the servo drive motor 7 is set upward and rotates through the top of the drive platform 2, extending into the movable slot 12 opened at the top of the drive platform 2. At the output end of the servo drive motor 7, a drive gear 14 is fixedly connected by a key connection. The drive gear 14 is a spur gear and is rotatably connected to the inner wall of the movable slot 12 by bearings, so that the drive gear 14 can rotate stably under the drive of the servo drive motor 7.

[0026] like Figure 3 , Figure 4 , Figure 5 As shown, the turntable bearing 10 is a key component for realizing the rotation and load-bearing functions of the worktable. Several positioning holes 15 are provided at its bottom. Positioning pins pass through these holes 15 to achieve precise positioning and connection with the top of the mounting base 1. Bolts further reinforce the bearing, ensuring the stability and accuracy of the turntable bearing 10's installation on the top of the mounting base 1. A turntable drive gear ring 9 is fixedly sleeved on the outer wall of the turntable bearing 10. The spur tooth thickness of the drive gear 14 is higher than that of the turntable drive gear ring 9, ensuring that the turntable drive gear ring 9 can always mesh with the drive gear 14 while it is moving up and down. The inner wall of the moving gear ring 9 and the outer wall of the turntable bearing 10 are in clearance fit, and the side wall of the turntable drive gear ring 9 meshes with the side wall of the drive gear 14. When the servo drive motor 7 drives the drive gear 14 to rotate, the drive gear 14 can drive the turntable drive gear ring 9 to rotate around the turntable bearing 10. The turntable body 11 is installed on the top of the turntable drive gear ring 9 by welding or bolting. The turntable body 11 rotates synchronously with the rotation of the turntable drive gear ring 9, thereby realizing the rotation function of the worktable and meeting the needs of processing workpieces at different angles during the processing.

[0027] like Figure 3 , Figure 4 , Figure 5As shown, several hydraulic cylinders 13 arranged in a polar array are installed on the inner wall of the movable groove 12 opened at the top of the drive platform 2. The tops of these hydraulic cylinders 13 are fixedly connected to the bottom of the turntable bearing 10. When the worktable needs to rotate, the hydraulic cylinders 13 are in the extended state, pushing the turntable bearing 10 upward, so that a certain gap is formed between the turntable body 11 and the top of the drive platform 2. At this time, the rolling elements inside the turntable bearing 10 play a role. When the turntable drive gear ring 9 drives the turntable body 11 to rotate around the turntable bearing 10, rolling friction is exhibited, which greatly reduces the friction during the rotation process and improves the flexibility and accuracy of the rotation. This also reduces wear on components and extends the service life of the worktable. When the worktable needs to withstand the mold closing pressure, the hydraulic cylinder 13 is in a retracted state, and the turntable bearing 10 moves downward under its own weight and the mold closing pressure, so that the bottom of the turntable body 11 is tightly fitted with the top of the drive platform 2. At this time, the force-bearing surface of the entire worktable increases, which can evenly transmit the mold closing pressure to the mounting base 1, and then to the ground through the mounting base 1. This effectively improves the worktable's ability to withstand the mold closing pressure, meets the needs of various high-pressure processing scenarios, and solves the problem that traditional servo rotary worktables are prone to deformation or damage when subjected to large pressure.

[0028] like Figures 2-5 As shown, a locking cylinder 5 is bolted to the middle of the inner wall of the mounting grid 8. The output end of the locking cylinder 5 is upward and passes through the top of the drive platform 2, and is movably connected to the bottom of the turntable body 11. When the turntable body 11 rotates to the designated position, the output end of the locking cylinder 5 extends and abuts tightly against the bottom of the turntable body 11, thereby locking and fixing the turntable body 11 to prevent it from shifting position during processing and ensuring processing accuracy. On both sides of the middle of the inner wall of the mounting grid 8, positioning cylinders 6 are also bolted to the middle of the inner wall. The output ends of both positioning cylinders 6 are upward and pass through the inner wall of the drive platform 2, respectively. They are engaged in the positioning groove at the bottom of the turntable body 11 by positioning cylinders 16. During the rotation of the turntable body 11 or after it rotates to the designated position, the output end of the positioning cylinder 6 can extend and use the positioning cylinder 16 to assist in positioning the turntable body 11, further improving the accuracy of the turntable body 11's position and ensuring the smooth progress of processing.

[0029] It should be noted that when using this utility model: the entire servo rotary table is pushed to the required working position by the moving wheel 4 in the mounting groove 3 at the bottom of the mounting base 1, and then the moving wheel 4 is locked by the braking device to prevent the table from moving during the working process.

[0030] The hydraulic cylinder 13 extends, lifting the turntable bearing 10. Since the spur tooth thickness of the drive gear 14 is greater than that of the turntable drive gear ring 9, it ensures that the turntable drive gear ring 9 remains engaged with the drive gear 14 during lifting and lowering. A gap forms between the turntable body 11 and the top of the drive platform 2. The servo drive motor 7 is then activated, driving the drive gear 14 to rotate. The drive gear 14 drives the engaged turntable drive gear ring 9 to rotate around the turntable bearing 10, causing the turntable drive gear ring 9 to rotate synchronously with the turntable body 11 until the turntable body 11 rotates. After the turntable body 11 rotates to the designated position at the specified processing angle, the output end of the positioning cylinder 6 extends to assist in positioning the turntable body 11 through the positioning cylinder 16. When mold closing processing is required and the mold closing pressure is to be borne, the hydraulic cylinder 13 is controlled to retract, and the bottom of the turntable body 11 is tightly fitted with the top of the drive platform 2. At this time, the worktable can stably bear the mold closing pressure and perform subsequent processing operations. After processing is completed, when demolding is required, the output ends of the locking cylinder 5 and multiple hydraulic cylinders 13 are controlled to retract, and the turntable body 11 is moved downward, thereby improving demolding efficiency.

[0031] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A novel servo rotary table, characterized in that: The system includes a mounting base (1), a drive platform (2) is mounted on the top of the mounting base (1), a movable groove (12) is opened on the top of the drive platform (2), a plurality of hydraulic cylinders (13) distributed in a polar array are mounted on the inner side wall of the movable groove (12), a turntable bearing (10) is fixedly connected to the top of the plurality of hydraulic cylinders (13), the turntable bearing (10) is vertically slidably connected to the inner side wall of the movable groove (12), a turntable drive gear ring (9) is fixedly sleeved on the outer side wall of the turntable bearing (10), a turntable body (11) is rotatably connected to the top of the drive platform (2) and fixedly mounted on the top of the turntable drive gear ring (9), an active drive gear (14) is meshed on the side wall of the turntable drive gear ring (9), a servo motor (7) is provided inside the mounting base (1), and the output end of the servo motor (7) is fixedly connected to the bottom of the active drive gear (14).

2. The novel servo rotary table according to claim 1, characterized in that: The inner side wall of the mounting base (1) is provided with a mounting grid (8), and the servo motor (7) is fixedly installed inside the mounting grid (8).

3. A novel servo rotary table according to claim 2, characterized in that: A locking cylinder (5) is fixedly installed in the middle of the inner side wall of the mounting grid (8). The output end of the locking cylinder (5) passes through the top of the drive platform (2) and is rotatably connected to the bottom of the turntable body (11).

4. A novel servo rotary table according to claim 3, characterized in that: Positioning cylinders (6) are fixedly installed on both sides of the inner wall of the mounting grid (8). The output ends of the two positioning cylinders (6) are fixedly installed with positioning cylinders (16) that pass through the inner wall of the drive platform (2) and are engaged in the positioning groove at the bottom of the turntable body (11).

5. A novel servo rotary table according to claim 4, characterized in that: The bottom of the turntable bearing (10) is provided with several positioning holes (15) that are connected to the top of the mounting base (1) by positioning pins.

6. A novel servo rotary table according to claim 5, characterized in that: The mounting base (1) has mounting grooves (3) at the four corners of its bottom, and the inner sidewalls of the mounting grooves (3) are rotatably connected to movable wheels (4) that fit against the ground.

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