Workpiece positioning mechanism of numerical control machine tool

Abstract

The utility model belongs to the technical field of numerically-controlled machine tools, and particularly discloses a numerically-controlled machine tool workpiece positioning mechanism which comprises a machine tool plate body, a driving assembly and a positioning assembly. Two guide rails are arranged on the top of the machine tool plate body in parallel and connected with the machine tool plate body through supports. The two positioning assemblies each comprise a positioning column and a sliding plate, the sliding plates are slidably connected with the two guide rails, and the positioning columns are located at the bottoms of the sliding plates and fixedly connected with the sliding plates. The driving assembly is fixedly arranged in the middle of the two guide rails, the two sliding plates are symmetrically arranged on the two sides of the driving assembly and are in transmission connection with the driving assembly, and the driving assembly is used for driving the two sliding plates to synchronously slide on the guide rails in the opposite directions. According to the utility model, one driving assembly is adopted to simultaneously drive the two positioning assemblies to move oppositely, and the two positioning assemblies are symmetrically arranged on the two sides of the driving assembly, so that a workpiece can be pushed to the central position of a machine tool plate body through the two positioning columns during positioning, and the positioning of the workpiece is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of numerical control machine tools, and in particular relates to a workpiece positioning mechanism for numerical control machine tools. Background Art

[0002] The positioning mechanism of a CNC machine tool plays a crucial role in the workpiece machining process, ensuring the machine's accuracy and stability during the machining process. With the advancement of technology, the positioning mechanism of CNC machine tools has evolved into a motor-driven screw-nut pair, which drives the tool to move linearly on the guide rail. A position detection device detects the tool's position in real time and feeds this position information back to the control system. The control system controls the motor based on this position information and preset program instructions to achieve precise positioning. However, this process is specifically for controlling the CNC machine tool's tool. To further improve workpiece machining accuracy, precise positioning of the workpiece's placement or fixed position is also required.

[0003] Chinese patent publication number CN221065396U discloses a positioning mechanism for a CNC machine tool. When positioning a workpiece, a crank adjusts the position of a connecting column, which in turn drives a fixed plate to move. Two movable plates are used to position and clamp the workpiece. However, in this solution, the two fixed plates move independently, making it impossible to ensure that the workpiece is moved to the center of the operating table. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects in the prior art and provide a workpiece positioning mechanism for a CNC machine tool.

[0005] The utility model provides a workpiece positioning mechanism for a CNC machine tool, comprising a machine tool plate, a drive assembly and a positioning assembly;

[0006] Two guide rails are arranged in parallel on the top of the machine tool plate, and the guide rails are connected to the machine tool plate through brackets;

[0007] There are two positioning assemblies, each comprising a positioning post and a sliding plate, wherein the sliding plate is slidably connected to the two guide rails, and the positioning post is located at the bottom of the sliding plate and is fixedly connected to the sliding plate;

[0008] The driving assembly is fixedly arranged in the middle of the two guide rails, the two sliding plates are symmetrically arranged on both sides of the driving assembly and are transmission-connected to the driving assembly, and the driving assembly is used to drive the two sliding plates to slide synchronously on the guide rails in opposite directions.

[0009] A further solution is that the drive assembly includes a motor support fixedly arranged on both sides of the middle of the two guide rails, a motor is arranged on the top of the motor support, the output end of the motor is connected to a transmission shaft, the transmission shaft is arranged vertically downward, and a gear is provided at one end of the transmission shaft away from the motor, the transmission shaft is located between the two guide rails, and the bottom end of the transmission shaft extends to the bottom of the guide rails;

[0010] A rack is provided on one side of the bottom of each of the two sliding plates. The two racks are respectively located on both sides of the gear and are respectively engaged with the gear.

[0011] A further solution is that ear plates are respectively extended outward on both sides of the bottom of the motor support, and rollers are respectively provided at the bottom of the two ear plates, and the rollers abut against the back of the rack so that when the gear drives the rack to move horizontally, the back of the rack drives the rollers to rotate.

[0012] A further solution is that the length of the rack is 1 / 2 of the length of the guide rail.

[0013] A further solution is that a positioning plate is further provided at the bottom of the gear, the positioning plate is coaxially arranged with the gear, and a laser lamp is provided at the center of the bottom of the positioning plate.

[0014] A further solution is that positioning blocks are provided on opposite sides of the two positioning posts;

[0015] A blind hole is formed on one side of the two positioning blocks facing each other, and a positioning rod is provided inside the blind hole;

[0016] A spring is further provided inside the blind hole, one end of the spring is connected to the closed end of the blind hole, and the other end of the spring is connected to the positioning rod.

[0017] A further solution is that a positioning groove is provided on the machine tool plate, and the position of the positioning groove is adapted to the two guide rails.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (1) The utility model adopts a driving assembly to simultaneously drive two positioning assemblies to move toward each other. Since the two positioning assemblies are symmetrically arranged on both sides of the driving assembly, the workpiece can be pushed to the center position of the machine tool plate through the two positioning columns during positioning, thereby realizing the positioning of the workpiece.

[0020] (2) The utility model drives the gear to rotate through a motor, thereby realizing the movement of the two racks in opposite directions, driving the positioning column to realize the positioning function. A roller is also provided on the outside of the rack, which reduces the friction between the roller and the rack while ensuring the effective engagement of the rack and the gear.

[0021] (3) The utility model has a plurality of retractable positioning rods densely arranged on the inner side of the positioning block, which can be used not only to position the workpiece but also to clamp various irregular workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following drawings are only used to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0023] Figure 1 : Schematic diagram of the structure of the utility model;

[0024] Figure 2 : Schematic diagram of the drive component structure;

[0025] Figure 3 : Schematic diagram of the positioning block structure;

[0026] In the figure: 1. Machine tool plate; 2. Bracket; 3. Navigation; 4. Positioning column; 5. Sliding plate; 6. Rack; 7. Positioning block; 8. Motor support; 9. Motor; 10. Rotating shaft; 11. Gear; 12. Ear plate; 13. Roller; 14. Positioning plate; 15. Laser light; 16. Blind hole; 17. Spring; 18. Positioning rod; 19. Positioning slot. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution, design method and advantages of the present invention more clear, the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

[0028] like Figure 1 As shown, the utility model provides a CNC machine tool workpiece positioning mechanism, including a machine tool plate body 1, a drive assembly and a positioning assembly; two guide rails 3 are arranged in parallel on the top of the machine tool plate body 1, and there is a gap between the two guide rails 3, and the two guide rails 3 are connected to the machine tool plate body 1 through a bracket 2; in this embodiment, the cross-section of the guide rail 3 is an I-shaped structure. There are two positioning assemblies, each including a positioning column 4 and a sliding plate 5, the sliding plate 5 is slidably connected to the two guide rails 3, the positioning column 4 is located at the bottom of the sliding plate 5 and is fixedly connected to the sliding plate 5. The drive assembly is fixedly arranged in the middle of the two guide rails 3, and the two sliding plates 5 are symmetrically arranged on both sides of the drive assembly and are transmission-connected to the drive assembly, and the drive assembly is used to drive the two sliding plates 5 to slide synchronously on the guide rails 3 in opposite directions.

[0029] like Figure 2As shown, the drive assembly includes a motor support 8 fixedly mounted on both sides of the middle of the two guide rails 3. A motor 9 is mounted on top of the motor support 8. The output end of the motor 9 is connected to a transmission shaft 10. The transmission shaft 10 is arranged vertically downward, and a gear 11 is disposed on the end of the transmission shaft 10 away from the motor 9. The transmission shaft 10 is located between the two guide rails 3, and the bottom end of the transmission shaft 10 extends to the bottom of the guide rails 3. A rack 6 is disposed on one side of the bottom of each of the two sliding plates 5. The two racks 6 are located on either side of the gear 11 and mesh with the gear 11. In this embodiment, the length of the rack 6 is 1 / 2 of the length of the guide rails 3. When positioning the workpiece, the motor 9 drives the gear 11 to rotate via the transmission shaft 10. Since the two racks 6 are located on either side of the gear 11, when the gear 11 rotates, it drives the two racks 6 to move in opposite directions, thereby driving the two positioning columns 4 to move synchronously, positioning the workpiece to the center of the machine tool plate 1. It should be noted that positioning the workpiece at the center of the machine tool plate 1 presupposes that the axis of the motor 9 output shaft is located at the center of the machine tool plate 1. If the workpiece needs to be positioned elsewhere, the positions of the two guide rails need to be adjusted, and thus the axis of the motor 9 output shaft. To facilitate observation of the axis of the motor 9 output shaft, a positioning plate 14 is provided at the bottom of the gear 11. The positioning plate 14 is coaxial with the gear 11, and a laser light 15 is provided at the center of the bottom of the positioning plate 14. The position on the machine tool plate 1 where the laser light 15 shines is the axis of the motor 9 output shaft.

[0030] In order to prevent the rack 6 and the gear 11 from slipping, ear plates 12 are respectively extended outward on both sides of the bottom of the motor support 8, and rollers 13 are respectively provided at the bottom of the two ear plates 12. The rollers 13 abut against the back of the rack 6, so that when the gear drives the rack to move horizontally, the back of the rack 6 drives the rollers 13 to rotate, thereby ensuring the effective engagement of the rack 6 and the gear 11 while reducing the friction between the rollers 13 and the rack 6.

[0031] like Figure 3 As shown, two positioning posts 4 are each provided with a positioning block 7 on one side thereof; a blind hole 16 is formed on one side thereof, and a positioning rod 18 is disposed within each of the blind holes 16; a spring 17 is also disposed within each of the blind holes 16, one end of the spring 17 being connected to the closed end of the blind hole 16, and the other end of the spring 17 being connected to the positioning rod 18. When positioning and clamping a special-shaped workpiece, the positioning rod 18 can be retracted to varying degrees according to the different curved surfaces, thereby achieving clamping and positioning of the workpiece.

[0032] In this embodiment, since the positioning process requires the positioning block 7 to push the workpiece, a positioning groove 19 can be opened on the machine tool plate 1. The position of the positioning groove 19 is adapted to the two guide rails 3. During positioning, it is only necessary to place the workpiece at any position in the positioning groove 19 and start the motor 9 to push the workpiece to the center position of the positioning groove 19.

[0033] While various embodiments of the present invention have been described above, the above descriptions are illustrative and non-exhaustive, and are not intended to be limiting of the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A workpiece positioning mechanism for a CNC machine tool, characterized in that: It comprises a machine tool plate body (1), a driving component and a positioning component; Two guide rails (3) are arranged in parallel on the top of the machine tool plate (1), and the guide rails (3) are connected to the machine tool plate (1) via a bracket (2); There are two positioning assemblies, each comprising a positioning column (4) and a sliding plate (5), wherein the sliding plate (5) is slidably connected to the two guide rails (3), and the positioning column (4) is located at the bottom of the sliding plate (5) and is fixedly connected to the sliding plate (5); The driving assembly is fixedly arranged in the middle of the two guide rails (3), and the two sliding plates (5) are symmetrically arranged on both sides of the driving assembly and are transmission-connected to the driving assembly. The driving assembly is used to drive the two sliding plates (5) to slide synchronously on the guide rails (3) in opposite directions.

2. A CNC machine tool workpiece positioning mechanism according to claim 1, characterized in that: The driving assembly comprises a motor support (8) fixedly arranged on both sides of the middle of the two guide rails (3), a motor (9) is arranged on the top of the motor support (8), an output end of the motor (9) is connected to a transmission shaft (10), the transmission shaft (10) is arranged vertically downward, and a gear (11) is arranged at one end of the transmission shaft (10) away from the motor (9), the transmission shaft (10) is located between the two guide rails (3), and the bottom end of the transmission shaft (10) extends to the bottom of the guide rail (3); A rack (6) is provided on one side of the bottom of each of the two sliding plates (5), and the two racks (6) are respectively located on both sides of the gear (11) and are respectively engaged with the gear (11).

3. A CNC machine tool workpiece positioning mechanism according to claim 2, characterized in that: Ear plates (12) are respectively provided on both sides of the bottom of the motor support (8) extending outwards, and rollers (13) are respectively provided at the bottoms of the two ear plates (12). The rollers (13) abut against the back of the rack (6), so that when the gear drives the rack to move horizontally, the back of the rack (6) drives the rollers (13) to rotate.

4. A CNC machine tool workpiece positioning mechanism according to claim 3, characterized in that: The length of the rack (6) is 1 / 2 of the length of the guide rail (3).

5. A CNC machine tool workpiece positioning mechanism according to claim 4, characterized in that: A positioning disc (14) is also provided at the bottom of the gear (11), the positioning disc (14) is coaxially arranged with the gear (11), and a laser lamp (15) is provided at the center of the bottom of the positioning disc (14).

6. A CNC machine tool workpiece positioning mechanism according to claim 5, characterized in that: Positioning blocks (7) are provided on opposite sides of the two positioning columns (4); A blind hole (16) is provided on one side opposite to the two positioning blocks (7), and a positioning rod (18) is provided inside the blind hole (16); A spring (17) is further provided inside the blind hole (16), one end of the spring (17) is connected to the closed end of the blind hole (16), and the other end of the spring (17) is connected to the positioning rod (18).

7. A CNC machine tool workpiece positioning mechanism according to claim 6, characterized in that: A positioning groove (19) is provided on the machine tool plate (1), and the position of the positioning groove (19) is adapted to the two guide rails (3).

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