A machine tool indexing rotary table

Abstract

This utility model provides a machine tool indexing rotary table, belonging to the technical field of machine tool equipment. It solves the problem of unstable rotation of the worktable under load during indexing rotation in existing rotary tables. The machine tool indexing rotary table includes a slide saddle and a worktable. The worktable is supported above the slide saddle. A hydraulic cylinder is installed between the worktable and the slide saddle. The hydraulic cylinder includes a cylinder body and a piston gear plate that can slide up and down. The cylinder body is fixedly connected to the slide saddle. A fixed gear plate located below the piston gear plate is also fixedly connected to the slide saddle. A rotatable movable gear plate is sleeved on the outer periphery of the fixed gear plate. When the piston gear plate slides downward, it can engage with both the fixed and movable gear plates. When the piston gear plate slides upward, it can disengage from both the fixed and movable gear plates. A bearing is sleeved on the outer periphery of the hydraulic cylinder. The outer ring of the bearing is fixedly connected to the slide saddle, and the movable gear plate and the worktable are both fixedly connected to the inner ring of the bearing. This rotary table improves the rotational stability of the worktable during indexing adjustment.

Description

Technical Field

[0001] This utility model belongs to the field of machine tool equipment technology and relates to a machine tool indexing rotary table. Background Technology

[0002] High-end CNC machine tools possess multiple functions such as high speed, high precision, intelligence, composite operation, multi-axis linkage, and internet communication. Their development level is an important indicator of a country's modern industrialization. High-speed cutting has become an important means of machining and manufacturing technology. Horizontal machining centers can process many special key parts with complex shapes. At the same time, the indexing rotary table, as an important functional component of horizontal machining centers, directly affects the machining performance of the entire machine tool.

[0003] In existing horizontal machining centers, the locking and positioning of the indexing rotary table is achieved through upper and lower gear plates and a hydraulic cylinder. When the rotary table rotates, the worktable must be raised to disengage the positioning gear plate, enabling the rotation. After rotation, the worktable must be lowered to engage the end gear plate, achieving the locking action. For example, a rotary table for CNC machine tools disclosed in Chinese patent literature (publication number: CN210132259U) includes a slide, on which a worktable, a connecting shaft, a hydraulic cylinder, a bearing, a connecting plate, a large gear ring, a locking device, a rotary table drive device, and a signal triggering device are mounted. The worktable is located above the slide, with a groove at the center of its lower surface. The connecting shaft passes through the slide and is inserted into the groove. The hydraulic cylinder is sleeved on the outer circumference of the connecting shaft, and the bearing is mounted on the piston of the hydraulic cylinder. The connecting plate is sleeved on the top of the connecting shaft, located between the bearing and the worktable. The upper part of the connecting plate is fixedly connected to the worktable, and the lower part abuts against the bearing. A large gear ring is horizontally positioned below the worktable, with its upper part fixedly connected to the worktable. A locking device is located inside the large gear ring. A turntable drive and a signal triggering device are respectively located on both sides of the large gear ring, and the turntable drive is connected to the large gear ring via a transmission. The locking device includes a slide saddle, an upper gear plate, and a lower gear plate. The slide saddle is mounted on a slide block and has a through hole. The connecting shaft and the hydraulic cylinder are both located within the through hole. The lower gear plate and the upper gear plate are sequentially positioned above the slide saddle from bottom to top. The lower gear plate is fixedly connected to the slide saddle, and the upper gear plate is fixedly connected to the worktable. The upper gear plate meshes with the lower gear plate, and the cylinder body of the hydraulic cylinder is fixedly connected to the slide saddle.

[0004] When the aforementioned rotary table performs indexing, oil enters the lifting circuit of the hydraulic cylinder, causing the piston to move upward. The piston, through the coupling plate, drives the worktable upward. Simultaneously, the worktable drives the upper gear plate and the large gear ring upward. The upper gear plate disengages from the lower gear plate, no longer restricting the rotation of the worktable. The rotary table drive device drives the large gear ring to rotate, thereby rotating the worktable to the designated position. Then, oil enters the clamping circuit of the hydraulic cylinder, and the piston, through the coupling plate, drives the worktable downward. The upper and lower gear plates re-engage to position and lock the worktable, completing the rotary table indexing. During indexing adjustment, the worktable needs to be lifted and lowered, which not only limits the load-bearing capacity of the worktable but also causes rotational instability when the workpiece table is loaded with workpieces for weight-bearing indexing rotation. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a machine tool indexing rotary table, which solves the technical problem of unstable rotation of the worktable under load during indexing rotation of the existing rotary table.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A machine tool indexing rotary table includes a slide saddle and a worktable, the worktable being supported above the slide saddle. The table is characterized by a hydraulic cylinder disposed between the worktable and the slide saddle. The hydraulic cylinder includes a cylinder body and a piston gear disc capable of sliding up and down. The cylinder body is fixedly connected to the slide saddle. A fixed gear disc located below the piston gear disc is also fixedly connected to the slide saddle. A rotatable movable gear disc is sleeved on the outer periphery of the fixed gear disc. When the piston gear disc slides downwards, it can engage with both the fixed and movable gear discs. When the piston gear disc slides upwards, it can disengage from both the fixed and movable gear discs. A bearing is sleeved on the outer periphery of the hydraulic cylinder. The outer ring of the bearing is fixedly connected to the slide saddle, and the movable gear disc and the worktable are both fixedly connected to the inner ring of the bearing.

[0008] When the worktable needs indexing, the piston gear slides upward, disengaging from both the fixed and movable gears. Since the movable gear and the worktable are fixedly connected to the inner ring of the bearing, the rotation of the movable gear drives the worktable to rotate. After the worktable rotates to the desired position, the piston gear slides downward, engaging with both the fixed and movable gears. The fixed gear is fixedly connected to the slide saddle, and the movable gear is locked onto the slide saddle, completing the indexing adjustment. During indexing rotation, only the piston gear slides up and down; the worktable does not need to rise or fall. The worktable remains supported on the slide saddle, which not only increases the load-bearing capacity of the worktable but also improves the stability of the worktable rotation when a workpiece is mounted on it for weight-bearing indexing rotation.

[0009] In the aforementioned machine tool indexing rotary table, an inner bearing housing and an outer bearing housing are provided between the slide saddle and the worktable. The inner ring of the bearing is fixedly connected to the inner bearing housing, the outer ring of the bearing is fixedly connected to the outer bearing housing, the outer bearing housing is fixedly connected to the slide saddle, the worktable is abutted against the upper end face of the inner bearing housing and fixedly connected, the movable gear plate is abutted against the lower end face of the inner bearing housing and fixedly connected, and the lower end face of the movable gear plate is abutted against the slide saddle.

[0010] The slide saddle provides support for the moving gear plate, reducing the possibility of deformation when the piston gear plate descends, thus ensuring the stability of the indexing rotary table. The worktable is always supported on the slide saddle through the inner bearing housing and the moving gear plate, ensuring stable rotation of the worktable.

[0011] In the aforementioned indexing rotary table, a mounting groove is provided on the upper end face of the slide saddle. The hydraulic cylinder, fixed gear plate, moving gear plate, bearing, inner bearing seat, and outer bearing seat are all installed in the mounting groove, with the outer circumferential surface of the outer bearing seat abutting against the groove wall. This protects the hydraulic cylinder, fixed gear plate, moving gear plate, bearing, inner bearing seat, and outer bearing seat within the slide saddle, reducing interference from external impurities on the operation of the indexing rotary table and ensuring stable operation. Furthermore, the groove wall provides radial positioning for the outer bearing seat, which also contributes to the stability of the rotary table.

[0012] In the aforementioned indexing rotary table of the machine tool, an oil groove is provided on the lower end face of the movable gear plate. Adding lubricating oil to the oil groove provides lubrication for the relative rotation between the movable gear plate and the slide saddle, ensuring smooth and stable rotation of the movable gear plate within the slide saddle, and thus ensuring stable operation of the indexing rotary table.

[0013] In the aforementioned indexing rotary table, the oil groove includes a main groove and sub-grooves. The main groove is an annular shape arranged along the circumference of the moving gear disc, and the sub-grooves are strips arranged radially along the moving gear disc. Several sub-grooves are evenly arranged along the circumference of the moving gear disc. This arrangement of the oil grooves provides better lubrication, further ensuring smooth and stable rotation of the moving gear disc within the slide saddle, thus ensuring stable operation of the indexing rotary table.

[0014] In the aforementioned indexing rotary table, the main groove and the sub-groove are connected, and the connection point between the main groove and the sub-groove is located in the middle of the sub-groove. This arrangement of the oil groove allows for more uniform lubrication, further ensuring smooth and stable rotation of the moving gear disc within the slide saddle, thus making the indexing rotary table work stably.

[0015] In the aforementioned machine tool indexing rotary table, the cylinder body includes a separate main cylinder and a secondary cylinder. The inner circumferential surface of the piston gear disc has a convex ring, which is inserted between the main cylinder and the secondary cylinder. The separate arrangement of the main cylinder and the secondary cylinder facilitates the installation of the piston gear disc. The convex ring serves to withstand oil pressure and provide a limiting function, ensuring stable operation of the hydraulic cylinder.

[0016] In the aforementioned indexing rotary table of the machine tool, a locating pin is fixed on the piston gear plate. The upper end of the locating pin extends out of the piston gear plate and inserts into the cylinder body. The locating pin has a circumferential limiting function, preventing the piston gear plate from rotating during its up-and-down sliding process, and ensuring stable locking of the piston gear plate against the fixed and moving gear plates.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] During indexing rotation, only the piston gear slides up and down; the worktable does not need to be raised or lowered. This not only increases the load-bearing capacity of the worktable but also improves its rotational stability when workpieces are mounted on it for load-bearing indexing. An oil groove is provided on the lower end face of the moving gear to lubricate its rotation, ensuring stable operation of the indexing rotary table. Attached Figure Description

[0019] Figure 1 This is a sectional view of the indexing rotary table of this machine tool.

[0020] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0021] Figure 3 yes Figure 1 Enlarged view of point B in the middle.

[0022] Figure 4 This is a three-dimensional view of the moving gear plate in the indexing rotary table of this machine tool.

[0023] In the diagram, 1. Saddle; 1a. Mounting groove; 2. Worktable; 3. Hydraulic cylinder; 3a. Cylinder body; 3a1. Main cylinder; 3a2. Auxiliary cylinder; 3b. Piston gear plate; 3b1. Convex ring; 3c. First sealing ring; 3d. Second sealing ring; 3e. Third sealing ring; 3f. Upper oil chamber; 3g. Lower oil chamber; 3h. Positioning pin; 4. Fixed gear plate; 5. Moving gear plate; 5a. Oil groove; 5a1. Main groove; 5a2. Sub-groove; 6. Bearing; 7. Inner bearing seat; 8. Outer bearing seat; 9. Drive shaft; 9a. Drive gear; 10. Indexing motor. Detailed Implementation

[0024] The following are specific embodiments of the present invention, described in conjunction with the accompanying drawings, to further illustrate the technical solution of the present invention. However, the present invention is not limited to these embodiments. Figure 1As shown, a machine tool indexing rotary table includes a slide saddle 1 and a worktable 2. The worktable 2 is supported above the slide saddle 1. An intermediate shaft passes through the center of the slide saddle 1, and the lower end of the intermediate shaft is connected to a chassis. A hydraulic cylinder 3 is arranged between the worktable 2 and the slide saddle 1. The hydraulic cylinder 3 includes a cylinder body 3a and a piston gear disk 3b that can slide up and down. The cylinder body 3a is fixedly connected to the slide saddle 1. A fixed gear disk 4 located below the piston gear disk 3b is also fixedly connected to the slide saddle 1. A rotatable movable gear disk 5 is sleeved on the outer periphery of the fixed gear disk 4. The lower end face of the piston gear disk 3b has piston teeth, the upper end face of the fixed gear disk 4 has fixed teeth opposite to the piston teeth, and the upper end face of the movable gear disk 5 has movable teeth opposite to the piston teeth. When the piston gear disk 3b slides downward, it can mesh with both the fixed gear disk 4 and the movable gear disk 5. When the piston gear disk 3b slides upward, it can disengage from both the fixed gear disk 4 and the movable gear disk 5, thus disengaging. The outer circumference of the hydraulic cylinder 3 is fitted with a bearing 6, the outer ring of the bearing 6 is fixedly connected to the slide saddle 1, and the moving gear plate 5 and the worktable 2 are both fixedly connected to the inner ring of the bearing 6.

[0025] like Figure 1 and Figure 2 As shown, a mounting groove 1a is provided on the upper surface of the sliding saddle 1, and the hydraulic cylinder 3, bearing 6, fixed gear plate 4, and moving gear plate 5 are all installed in the mounting groove 1a. The lower end face of the moving gear plate 5 abuts against the bottom surface of the mounting groove 1a, and the lower end face of the fixed gear plate 4 also abuts against the bottom surface of the mounting groove 1a. The cylinder body 3a includes a main cylinder 3a1 and an auxiliary cylinder 3a2 that are separately set and sealed together. The inner circumferential surface of the piston gear plate 3b has a convex ring 3b1, which is inserted between the main cylinder 3a1 and the auxiliary cylinder 3a2. The upper end face of the piston gear plate 3b has an insert ring, and a first sealing ring 3c is provided between the insert ring and the main cylinder 3a1, a second sealing ring 3d is provided between the convex ring 3b1 and the main cylinder 3a1, and a third sealing ring 3e is provided between the lower end of the piston gear plate 3b and the auxiliary cylinder 3a2. In the gap between the piston gear 3b and the cylinder 3a, an upper oil chamber 3f is formed between the first sealing ring 3c and the second sealing ring 3d, and a lower oil chamber 3g is formed between the second sealing ring 3d and the third sealing ring 3e. Both the upper oil chamber 3f and the lower oil chamber 3g are connected to the hydraulic source. A positioning pin 3h is fixed on the piston gear 3b, and the upper end of the positioning pin 3h extends out of the piston gear 3b and is inserted into the main cylinder 3a1 of the cylinder 3a. An inner bearing seat 7 and an outer bearing seat 8 are also provided in the mounting groove 1a. The inner ring of the bearing 6 is fixed in the inner bearing seat 7, and the outer ring of the bearing 6 is fixed in the outer bearing seat 8. The outer bearing seat 8 is fixedly connected to the slide saddle 1, and the outer peripheral surface of the outer bearing seat 8 abuts against the groove wall of the mounting groove 1a. The inner bearing seat 7 is fixedly connected to the worktable 2 and the moving gear 5 respectively. The lower end face of the worktable 2 is in contact with the upper end face of the inner bearing seat 7, and the upper end face of the movable gear 5 is in contact with the lower end face of the inner bearing seat 7. The worktable 2 is supported on the slide saddle 1 by the inner bearing seat 7 and the movable gear 5.

[0026] like Figure 1 and Figure 4 As shown, the outer circumferential surface of the movable gear disk 5 is provided with driving teeth, and a vertically arranged transmission shaft 9 passes through the slide saddle 1. The upper end of the transmission shaft 9 is located in the mounting groove 1a and is provided with a transmission gear 9a, which meshes with the driving teeth on the outer circumferential surface of the movable gear disk 5. An indexing motor 10 is also fixedly connected to the slide saddle 1, and a gear transmission assembly is provided between the rotating shaft of the indexing motor 10 and the lower end of the transmission shaft 9.

[0027] like Figure 3 and Figure 4 As shown, an oil groove 5a is formed on the lower end surface of the moving gear disk 5. The oil groove 5a includes a main groove 5a1 and sub-grooves 5a2. The main groove 5a1 is an annular shape arranged along the circumference of the moving gear disk 5, and the sub-grooves 5a2 are strips arranged radially along the moving gear disk 5. There are several sub-grooves 5a2, which are evenly arranged along the circumference of the moving gear disk 5. The main groove 5a1 and the sub-grooves 5a2 are connected, and the connection between the main groove 5a1 and the sub-grooves 5a2 is located in the middle of the sub-grooves 5a2.

[0028] When the worktable 2 needs indexing adjustment, oil enters the lower oil chamber 3g and exits the upper oil chamber 3f, maintaining oil pressure. The piston toothed disc 3b slides upward, disengaging from both the fixed toothed disc 4 and the moving toothed disc 5. The indexing motor 10 then operates, driving the transmission shaft 9 to rotate, which in turn drives the moving toothed disc 5 to rotate via the transmission gear 9a. The rotation of the moving toothed disc 5 drives the worktable 2 to rotate. After the worktable 2 rotates to the required position, the indexing motor 10 stops operating. Oil enters the upper oil chamber 3f and exits the lower oil chamber 3g, maintaining oil pressure. The piston toothed disc 3b slides downward, meshing with both the fixed toothed disc 4 and the moving toothed disc 5. The moving toothed disc 5 is locked on the slide saddle 1, completing the indexing process. During the indexing rotation of this rotary table, only the piston toothed disc 3b slides up and down, and the worktable 2 does not need to be raised or lowered. The worktable 2 can always be supported on the slide saddle 1. This not only improves the load-bearing capacity of the worktable 2, but also improves the rotational stability of the worktable 2 when a workpiece is mounted on the worktable 2 for load-bearing indexing rotation.

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A machine tool indexing rotary table, comprising a slide (1) and a worktable (2), wherein the worktable (2) is supported above the slide (1), characterized in that, A hydraulic cylinder (3) is provided between the worktable (2) and the slide saddle (1). The hydraulic cylinder (3) includes a cylinder body (3a) and a piston toothed disc (3b) that can slide up and down. The cylinder body (3a) is fixedly connected to the slide saddle (1). A fixed toothed disc (4) located below the piston toothed disc (3b) is also fixedly connected to the slide saddle (1). A rotatable moving toothed disc (5) is sleeved on the outer periphery of the fixed toothed disc (4). When the piston toothed disc (3b) slides down, it can mesh with both the fixed toothed disc (4) and the moving toothed disc (5). When the piston toothed disc (3b) slides up, it can disengage from both the fixed toothed disc (4) and the moving toothed disc (5). A bearing (6) is sleeved on the outer periphery of the hydraulic cylinder (3). The outer ring of the bearing (6) is fixedly connected to the slide saddle (1). The moving toothed disc (5) and the worktable (2) are both fixedly connected to the inner ring of the bearing (6).

2. The machine tool indexing rotary table according to claim 1, characterized in that, An inner bearing seat (7) and an outer bearing seat (8) are provided between the slide saddle (1) and the worktable (2). The inner ring of the bearing (6) is fixedly connected in the inner bearing seat (7), and the outer ring of the bearing (6) is fixedly connected in the outer bearing seat (8). The outer bearing seat (8) is fixedly connected to the slide saddle (1). The worktable (2) is attached to the upper end face of the inner bearing seat (7) and fixedly connected. The moving gear plate (5) is attached to the lower end face of the inner bearing seat (7) and fixedly connected. The lower end face of the moving gear plate (5) is attached to the slide saddle (1).

3. The machine tool indexing rotary table according to claim 2, characterized in that, The upper end face of the sliding saddle (1) is provided with an installation groove (1a). The hydraulic cylinder (3), fixed gear plate (4), moving gear plate (5), bearing (6), inner bearing seat (7) and outer bearing seat (8) are all installed in the installation groove (1a), and the outer peripheral surface of the outer bearing seat (8) is attached to the groove wall of the installation groove (1a).

4. The machine tool indexing rotary table according to any one of claims 1-3, characterized in that, An oil groove (5a) is provided on the lower end surface of the moving gear disc (5).

5. The machine tool indexing rotary table according to claim 4, characterized in that, The oil trough (5a) includes a main trough (5a1) and a sub-trough (5a2). The main trough (5a1) is an annular shape arranged along the circumference of the moving gear disk (5). The sub-trough (5a2) is a strip shape arranged along the radial direction of the moving gear disk (5). There are several sub-troughs (5a2) and they are evenly arranged along the circumference of the moving gear disk (5).

6. The machine tool indexing rotary table according to claim 5, characterized in that, The main groove (5a1) and the sub-groove (5a2) are connected, and the connection between the main groove (5a1) and the sub-groove (5a2) is located in the middle of the sub-groove (5a2).

7. The machine tool indexing rotary table according to any one of claims 1-3, characterized in that, The cylinder body (3a) includes a main cylinder (3a1) and a secondary cylinder (3a2) that are separately arranged. The piston toothed disc (3b) has a convex ring (3b1) on its inner circumferential surface, and the convex ring (3b1) is inserted between the main cylinder (3a1) and the secondary cylinder (3a2).

8. The machine tool indexing rotary table according to any one of claims 1-3, characterized in that, A positioning pin (3h) is fixed on the piston toothed disc (3b), and the upper end of the positioning pin (3h) extends out of the piston toothed disc (3b) and is inserted into the cylinder (3a).

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