A dedicated center rest for machining long splined shafts

Abstract

This utility model discloses a special center frame for machining long splined shafts, belonging to the technical field of shaft machining auxiliary equipment. It includes a base mounted on a machine tool base, with a clamping plate connected to the bottom of the base by a first bolt. An annular plate is fixedly connected to the top of the base. Three circumferentially spaced rotating arms are rotatably mounted on the front of the annular plate, with bearings installed at one end of each arm. A drive mechanism is mounted on the back of the annular plate to drive the three rotating arms to rotate synchronously in the same direction. By using three rotating arms and bearings, and with the three arms circumferentially spaced, the drive mechanism allows the three arms to simultaneously abut against the outer wall of the long splined shaft to be machined when rotated synchronously, eliminating the need for individual arm adjustment and making adjustment more convenient.

Description

Technical Field

[0001] This utility model relates to a shaft machining auxiliary device, and in particular to a special center rest for machining long spline shafts, belonging to the technical field of shaft machining auxiliary equipment. Background Technology

[0002] Conventional lathes are typically equipped with a center rest for auxiliary machining of slender shaft components. The center rests on these conventional lathes are designed for machining typical slender shafts. Traditionally, the three jaws supporting the center rest are made of fixed tin bronze. The tin bronze jaws have a large contact area with the large-diameter shaft, resulting in high friction and heat generation. This not only leads to excessive wear on the copper rods but also reduces work efficiency due to the high friction.

[0003] Application CN200720020236.7 discloses a special center frame for machining large-diameter long shafts, including a lower base, an upper base, and two adjustable-length support sleeves mounted on the lower base and one on top of the upper base, facing each other towards the center. Support claws are installed at the opposing center ends of the support sleeves, and each support claw is a roller that can roll on the rotating diameter of the supported long shaft. Because the three claw ends supporting the long shaft on the center frame are equipped with rollers, during operation, the rollers roll on the outer circumference of the rotating long shaft for contact support, reducing the friction between the support claws on the center frame and the outer circumference of the shaft, preventing material waste, reducing manufacturing costs, and increasing efficiency.

[0004] However, the device still has the following problems: the center frame requires adjustment of the three rollers to make them abut against the shaft wall, which is inconvenient to adjust, and some rollers may be at different distances from the shaft wall than other rollers, affecting the processing of spline shafts.

[0005] Therefore, this utility model proposes a new solution. Utility Model Content

[0006] The main purpose of this utility model is to provide a special center rest for machining long spline shafts in order to overcome the shortcomings of the existing technology.

[0007] The objective of this utility model can be achieved by adopting the following technical solution:

[0008] A special center rest for machining long splined shafts includes a base mounted on a machine tool base, a clamping plate connected to the bottom of the base by a first bolt, an annular plate fixedly connected to the top of the base, three rotating arms rotatably mounted on the front of the annular plate at equal intervals around the circumference, a bearing mounted at one end of each rotating arm, and a drive mechanism for driving the three rotating arms to rotate synchronously and in the same direction mounted on the back of the annular plate.

[0009] Preferably, the drive mechanism includes a driving synchronous pulley, a driven synchronous pulley, and a synchronous belt, wherein the driving synchronous pulley is rotatably connected to the annular plate, the driven synchronous pulley is connected to the other end of the rotating arm, and the synchronous belt is connected between the driving synchronous pulley and the three driven synchronous pulleys.

[0010] Preferably, two auxiliary synchronous pulleys are rotatably mounted on the back of the annular plate. The two auxiliary synchronous pulleys and the active synchronous pulley are distributed at equal intervals around the circumference. A rotating shaft is fixedly connected to the middle of each of the two auxiliary synchronous pulleys and the active synchronous pulley. A first rotating hole that mates with the rotating shaft is provided on the annular plate.

[0011] Preferably, one end of the shaft located on the active synchronous pulley is fixedly connected to a handle, and the other end is threadedly connected to a set nut, with external threads on its outer wall.

[0012] Preferably, a first rotating rod is fixedly connected to the outer wall of the front side of one end of the rotating arm, and a screw hole is provided on the inner side of the first rotating rod, and a mounting screw is installed on the inner side of the first rotating rod.

[0013] Preferably, a second rotating rod that penetrates the annular plate is fixedly connected to the outer wall of the back side of the other end of the rotating arm, the driven synchronous pulley is fixedly installed on the outer wall of the second rotating rod, and a second rotating hole that cooperates with the second rotating rod is provided on the annular plate.

[0014] Preferably, the back of the annular plate is connected to the housing by a second bolt.

[0015] Preferably, connecting sleeves are fixedly connected to both the outer wall of the annular plate and the outer wall of the housing.

[0016] Preferably, a through groove is provided in the middle between the base and the annular plate.

[0017] Preferably, the bottom of one end of the base is provided with a positioning groove that mates with the machine tool base.

[0018] The beneficial technical effects of this utility model are as follows: According to the special center frame for machining long spline shafts of this utility model, by setting three rotating arms and bearings, the three rotating arms are arranged at equal intervals around the circumference. When the drive mechanism drives the three rotating arms to rotate synchronously, they can simultaneously abut against the outer wall of the long spline shaft to be machined, without the need to adjust the rotating arms individually, making adjustment more convenient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure according to a preferred embodiment of the present invention;

[0020] Figure 2This is a rear view of the overall structure according to a preferred embodiment of the present invention;

[0021] Figure 3 This is a rear view of the overall structure after removing the casing according to a preferred embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of a ring plate structure according to a preferred embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of a rotating arm structure according to a preferred embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the active synchronous belt pulley structure according to a preferred embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of an auxiliary synchronous pulley structure according to a preferred embodiment of the present invention.

[0026] In the diagram: 1. Machine tool base; 2. Base; 3. First bolt; 4. Clamping plate; 5. Annular plate; 6. Rotary arm; 7. Bearing; 8. Driving synchronous pulley; 9. Driven synchronous pulley; 10. Synchronous belt; 11. Auxiliary synchronous pulley; 12. Rotary shaft; 13. Handle; 14. Set nut; 501. First rotating hole; 601. First rotating rod; 602. Screw hole; 603. Mounting screw; 604. Second rotating rod; 502. Second rotating hole; 15. Second bolt; 16. Machine housing; 17. Connecting sleeve; 18. Through groove; 19. Positioning groove. Detailed Implementation

[0027] To enable those skilled in the art to understand the technical solution of this utility model more clearly, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0028] like Figures 1-7 As shown in this embodiment, a dedicated center rest for machining long splined shafts includes a base 2 mounted on a machine tool base 1. A clamping plate 4 is connected to the bottom of the base 2 via a first bolt 3. An annular plate 5 is fixedly connected to the top of the base 2. Three circumferentially spaced rotating arms 6 are rotatably mounted on the front of the annular plate 5. A bearing 7 is mounted at one end of each rotating arm 6. A drive mechanism for driving the three rotating arms 6 to rotate synchronously and in the same direction is mounted on the back of the annular plate 5. By setting three rotating arms 6 and bearings 7, and circumferentially spaced, when the drive mechanism drives the three rotating arms 6 to rotate synchronously, they can simultaneously abut against the outer wall of the long splined shaft to be machined, eliminating the need for individual adjustment of each rotating arm 6, thus making adjustment more convenient.

[0029] In this embodiment, as Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, the drive mechanism includes a driving synchronous pulley 8, a driven synchronous pulley 9, and a synchronous belt 10. The driving synchronous pulley 8 is rotatably connected to the annular plate 5, the driven synchronous pulley 9 is connected to the other end of the rotating arm 6, and the synchronous belt 10 is connected between the driving synchronous pulley 8 and the three driven synchronous pulleys 9. Two auxiliary synchronous pulleys 11 are rotatably mounted on the back of the annular plate 5. The two auxiliary synchronous pulleys 11 and the driving synchronous pulley 8 are distributed at equal intervals around the circumference. A rotating shaft 12 is fixedly connected to the middle of the two auxiliary synchronous pulleys 11 and the driving synchronous pulley 8. A first rotating hole 501 that mates with the rotating shaft 12 is opened on the annular plate 5. A handle 13 is fixedly connected to one end of the rotating shaft 12 located on the driving synchronous pulley 8, and a set nut 14 is threadedly connected to the other end. The shaft 12 has an external thread on its outer wall. With the arrangement of the active synchronous pulley 8, driven synchronous pulleys 9, and synchronous belt 10, rotating the active synchronous pulley 8 drives the three driven synchronous pulleys 9 to rotate via the synchronous belt 10, thereby causing the three rotating arms 6 and bearings 7 to rotate synchronously. When the active synchronous pulley 8 rotates forward, the three bearings 7 approach each other and abut against the outer wall of the long spline shaft to be machined. After machining, the active synchronous pulley 8 is rotated in reverse for removal. With the setting of the set nut 14, when the three bearings 7 approach each other and abut against the outer wall of the long spline shaft to be machined, the set nut 14 is rotated to fix the position. When the long spline shaft needs to be removed after machining, the set nut 14 is loosened and removed from the device. With the setting of the auxiliary synchronous pulleys 11, the two auxiliary synchronous pulleys 11, the active synchronous pulley 8, and the three driven synchronous pulleys 9 are arranged in a circumferentially equidistant manner, which can ensure the stability of synchronous movement.

[0030] In this embodiment, as Figure 3 , Figure 4 and Figure 5 As shown, a first rotating rod 601 is fixedly connected to the outer wall of the front end of one end of the rotating arm 6. A screw hole 602 is provided on the inner side of the first rotating rod 601, and a mounting screw 603 is installed on the inner side of the first rotating rod 601. A second rotating rod 604, penetrating the annular plate 5, is fixedly connected to the outer wall of the back end of the rotating arm 6. The driven synchronous pulley 9 is fixedly installed on the outer wall of the second rotating rod 604. A second rotating hole 502, which mates with the second rotating rod 604, is provided on the annular plate 5. Through the first rotating rod 601, the bearing 7 is installed on the outer wall of the rotating arm and fixedly installed by the mounting screw 603. The second rotating rod 604 is used to fix and install the driven synchronous pulley 9.

[0031] In this embodiment, as Figure 1 , Figure 2 and Figure 3As shown, the back of the annular plate 5 is connected to the housing 16 by a second bolt 15. Connecting sleeves 17 are fixedly connected to both the outer wall of the annular plate 5 and the outer wall of the housing 16. The housing 16 protects the drive mechanism and facilitates easy assembly and disassembly.

[0032] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, a through groove 18 is provided in the middle between the base 2 and the annular plate 5, and a positioning groove 19 is provided at the bottom of one end of the base 2 to cooperate with the machine tool base 1. The through groove 18 facilitates the fixing of the clamping plate 4 by personnel, and the positioning groove 19 limits the position of the base 2.

[0033] In this embodiment, as Figures 1-7 As shown in the figure, the working process of a special center rest for machining long splined shafts provided in this embodiment is as follows:

[0034] Step 1: Move the center frame so that the long spline shaft passes through the annular plate 5. After moving it to the appropriate position, tighten the first bolt 3 to fix it.

[0035] Step 2: Then turn handle 13 so that the three bearings 7 abut against the outer wall of the long spline shaft, and tighten the set nut 14.

[0036] Step 3: After completing the processing, loosen the set nut 14 and the first bolt 3, and remove the center frame.

[0037] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A dedicated center rest for machining long splined shafts, comprising a base (2) mounted on a machine tool base (1), wherein a clamping plate (4) is connected to the lower part of the base (2) by a first bolt (3), and an annular plate (5) is fixedly connected to the top of the base (2), characterized in that, The front of the annular plate (5) is rotatably mounted with three rotating arms (6) arranged at equal intervals around the circumference. One end of each rotating arm (6) is equipped with a bearing (7). The back of the annular plate (5) is equipped with a drive mechanism that drives the three rotating arms (6) to rotate synchronously and in the same direction.

2. A special center rest for machining long splined shafts according to claim 1, characterized in that, The drive mechanism includes an active synchronous pulley (8), a driven synchronous pulley (9), and a synchronous belt (10), wherein the active synchronous pulley (8) is rotatably connected to the annular plate (5), the driven synchronous pulley (9) is connected to the other end of the rotating arm (6), and the synchronous belt (10) is connected between the active synchronous pulley (8) and the three driven synchronous pulleys (9).

3. A special center rest for machining long splined shafts according to claim 2, characterized in that, Two auxiliary synchronous pulleys (11) are rotatably mounted on the back of the annular plate (5). The two auxiliary synchronous pulleys (11) and the active synchronous pulley (8) are distributed at equal intervals around the circumference. A rotating shaft (12) is fixedly connected to the middle of the two auxiliary synchronous pulleys (11) and the active synchronous pulley (8). A first rotating hole (501) that cooperates with the rotating shaft (12) is provided on the annular plate (5).

4. A special center rest for machining long splined shafts according to claim 3, characterized in that, One end of the shaft (12) located on the active synchronous pulley (8) is fixedly connected to a handle (13), and the other end is threadedly connected to a set nut (14), with external threads on its outer wall.

5. A special center rest for machining long splined shafts according to claim 1, characterized in that, A first rotating rod (601) is fixedly connected to the outer wall of the front side of one end of the rotating arm (6). The inner side of the first rotating rod (601) is provided with a screw hole (602) and an installation screw (603) is installed on the inner side of the first rotating rod (601).

6. A special center rest for machining long splined shafts according to claim 2, characterized in that, A second rotating rod (604) that penetrates the annular plate (5) is fixedly connected to the outer wall of the back side of the other end of the rotating arm (6). The driven synchronous pulley (9) is fixedly installed on the outer wall of the second rotating rod (604). A second rotating hole (502) that cooperates with the second rotating rod (604) is opened on the annular plate (5).

7. A special center rest for machining long splined shafts according to claim 1, characterized in that, The back of the annular plate (5) is connected to the housing (16) by a second bolt (15).

8. A special center rest for machining long splined shafts according to claim 7, characterized in that, Connecting sleeves (17) are fixedly connected to both the outer wall of the annular plate (5) and the outer wall of the housing (16).

9. A special center rest for machining long splined shafts according to claim 1, characterized in that, A through groove (18) is provided in the middle between the base (2) and the annular plate (5).

10. A special center rest for machining long splined shafts according to claim 1, characterized in that, The bottom of one end of the base (2) is provided with a positioning groove (19) that mates with the machine tool base (1).

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