Accurate positioning clamp of numerically controlled lathe for musical instrument production

Abstract

The utility model relates to the technical field of numerical control lathe fixtures, in particular to a numerical control lathe accurate positioning fixture for musical instrument production, which comprises a base and connecting rods, a support plate is rotatably connected onto the base, a placing plate is connected onto the support plate, a plurality of mounting plates are mounted on the support plate, and two ends of each connecting rod are rotatably connected with the mounting plates. The four connecting rods are connected with extrusion blocks, bevel gear sets are arranged at the ends of the four connecting rods, the extrusion blocks are slidably connected into the containing plate, a motor is mounted on the mounting plate, one ends of the connecting rods at the front end and the rear end are connected with an output shaft of the motor, and the other ends of the connecting rods are in transmission connection with the connecting rods at the left end and the right end through the bevel gear sets. The connecting rods are driven by the motor to rotate and matched with the bevel gear set to enable the four connecting rods to synchronously drive the extrusion block to move towards the center, pressure values in all directions are detected in real time through the pressure sensor, driving is automatically cut off based on threshold judgment by the controller, closed-loop control over clamping force is achieved, self-centering clamping is completed, and the clamping efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool fixture technology, and in particular to a precision positioning fixture for a CNC lathe used in musical instrument production. Background Technology

[0002] Musical instrument manufacturing demands extremely high precision in the machining of components, especially the core parts of string, wind, and keyboard instruments, which have complex geometries and must meet stringent acoustic performance requirements. CNC lathes, as key equipment in precision machining, rely directly on the positioning accuracy and stability of the fixtures for their machining efficiency and quality. The fixtures must be able to quickly and reliably clamp irregularly shaped or symmetrical workpieces during high-speed rotation and cutting, avoiding machining errors caused by clamping deviations, thereby ensuring the dimensional consistency and surface finish of musical instrument parts.

[0003] A precision positioning fixture for CNC lathes, with announcement number CN217647952U, clamps the workpiece from four directions by driving the clamping plates with four independent lead screws. Four symmetrically distributed lead screw transmission mechanisms are arranged on the base to adjust the position of the clamping plates to hold the central area of ​​the workpiece. Theoretically, this structure can accommodate workpieces of different sizes, especially irregularly shaped parts, and improves clamping stability through multi-point contact.

[0004] However, the four sets of lead screws need to be adjusted independently, and the position of the clamping plates needs to be repeatedly calibrated during operation to ensure centering. The adjustment steps are cumbersome and time-consuming, making it difficult to meet the needs of high-efficiency production. Secondly, due to the lack of linkage in the movement of the clamping plates, manual or step-by-step driving can easily cause the four clamping plates to fail to accurately and synchronously abut against the workpiece, resulting in the actual clamping center of the workpiece shifting and affecting the machining accuracy. Utility Model Content

[0005] To overcome the drawbacks of time-consuming step-by-step adjustment and low centering accuracy, the technical problem of this utility model is to provide a precision positioning fixture for CNC lathes used in musical instrument production, aiming to solve the above-mentioned shortcomings.

[0006] A precision positioning fixture for a CNC lathe used in musical instrument production includes a base and connecting rods. A support plate is rotatably connected to the base. A rotating assembly for adjusting the angle of the support plate is provided between the base and the support plate. A placement plate is connected to the support plate. Several mounting plates are installed on the support plate. Both ends of four connecting rods are rotatably connected to the mounting plates. Each of the four connecting rods is connected to a pressing block. A bevel gear set is provided at the end of each of the four connecting rods. The pressing block is slidably connected to the placement plate. A motor is installed on the mounting plate. One end of each connecting rod at the front and rear ends is connected to the output shaft of the motor, and the other end is connected to the connecting rods at the left and right ends respectively through the bevel gear sets.

[0007] To further explain, the rotating assembly includes a threaded rod, a rotating disk is connected to the bottom of the support plate, the outer circumference of the rotating disk has several grooves, the threaded rod is threadedly connected to the base, a slider is slidably connected inside the base, one side of the slider is rotatably connected to the end of the threaded rod, and the other side of the slider is slidably connected to a locking block, the locking block is fitted with a return spring, one end of the return spring is connected to the slider, and the other end is connected to the locking block, the locking block is limited and engaged with the grooves of the rotating disk.

[0008] Further explanation: It also includes a contact plate, an adjusting rod is threadedly connected to the extrusion block, a connecting block is connected to the end of the adjusting rod, the contact plate is rotatably connected to the connecting block, the contact plate is limited to the adjusting rod through the connecting block, and the contact plate contacts the side of the extrusion block facing the center of the support plate.

[0009] To further explain, a pressure sensor is connected to the side of the contact plate opposite to the extrusion block.

[0010] To further explain, a roller is rotatably connected to one end of the card block that mates with the groove, and the roller is in rolling connection with the rotating disk.

[0011] To further explain, the alignment stickers are respectively attached to the sides of the base and the support plate, and the two parts of the alignment stickers are aligned vertically.

[0012] To further explain, a warning line is provided in the center of the top surface of the placement plate.

[0013] To further explain, after the extrusion block rotates, its top front and rear sides both contact the top surface of the placement plate, the end of the threaded rod extending out of the base is connected to a plum blossom handle, and the pressure sensor is wrapped with a rubber sleeve.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. The motor drives the connecting rod to rotate, and with the linkage transmission of the bevel gear set, the four connecting rods synchronously drive the extrusion block to move towards the center. The pressure sensor detects the pressure value in each direction in real time, and the controller automatically cuts off the drive based on the threshold judgment, realizing closed-loop control of the clamping force, completing self-centering clamping, and improving clamping efficiency.

[0016] 2. By adjusting the contact plate on the extrusion block through the threaded adjustment rod, it can adapt to the contours of parts of different sizes, ensuring that the clamping force on all four sides is applied simultaneously, thus optimizing the clamping range.

[0017] 3. The rotating disc and the locking block are engaged by a groove-roller rolling mechanism, combined with the elastic pre-tightening of the return spring. The operator only needs to turn the threaded rod to quickly switch the rotation angle of the support plate. The visual alignment design of the return sticker, along with the center mark of the warning line, avoids repeated calibration. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram showing the connection relationship between the base and the support plate of this utility model.

[0020] Figure 3 This is a schematic diagram of the mounting structure of the mounting plate and connecting rod of this utility model.

[0021] Figure 4 This is a cross-sectional view showing the connection relationship between the rotating disk and the threaded rod of this utility model.

[0022] Figure 5 This is a cross-sectional view showing the connection relationship between the slider and the card block of this utility model.

[0023] Figure 6 This is an exploded view showing the connection relationship between the adjusting rod and the connecting block of this utility model.

[0024] The markings in the attached diagram are as follows: 1: base, 2: support plate, 3: placement plate, 4: mounting plate, 41: connecting rod, 5: pressing block, 6: motor, 7: bevel gear set, 8: rotating disk, 9: groove, 10: threaded rod, 11: slider, 12: locking block, 13: return spring, 14: adjusting rod, 15: connecting block, 16: contact plate, 17: pressure sensor, 18: roller, 19: alignment sticker, 20: warning line. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0026] Example: A precision positioning fixture for a CNC lathe used in musical instrument production, such as... Figures 1-6As shown, the assembly includes a base 1, a support plate 2, a placement plate 3, a mounting plate 4, connecting rods 41, an extrusion block 5, a motor 6, a bevel gear set 7, and a rotating component. The support plate 2 is rotatably connected to the base 1. A rotating component for adjusting the angle of the support plate 2 is provided between the base 1 and the support plate 2. The placement plate 3 is welded onto the support plate 2. Several mounting plates 4 are installed on the support plate 2. Both ends of four connecting rods 41 are rotatably connected to the mounting plates 4. An extrusion block 5 is welded onto each of the four connecting rods 41. A bevel gear set 7 is provided at the end of each of the four connecting rods 41. The extrusion block 5 is slidably connected to the placement plate 3. After the extrusion block 5 rotates, the top front and rear sides of the extrusion block 5 contact the top surface of the placement plate 3. The motor 6 is installed on the mounting plate 4. One end of the connecting rods 41 at the front and rear ends is fixedly connected to the output shaft of the motor 6. A bevel gear set 7 is provided at the end of the connecting rods 41 at the front and rear ends. The connecting rods 41 at the left and right ends mesh with the front and rear connecting rods 41 through the bevel gear set 7.

[0027] like Figure 1 , Figure 4 and Figure 5 As shown, the rotating assembly includes a rotating disk 8, a threaded rod 10, a slider 11, a locking block 12, and a return spring 13. The rotating disk 8 is fixedly connected to the bottom of the support plate 2. The outer ring of the rotating disk 8 has several grooves 9. The threaded rod 10 is threadedly connected to the base 1. The slider 11 is slidably connected inside the base 1. One side of the slider 11 is rotatably connected to the end of the threaded rod 10. A perforated handle is fixedly connected to one end of the threaded rod 10 that extends out of the base 1. The locking block 12 is slidably connected to the other side of the slider 11. The locking block 12 is fitted with a return spring 13. One end of the return spring 13 is fixed to the slider 11, and the other end is fixed to the locking block 12. The locking block 12 is in a limiting fit with the grooves 9 of the rotating disk 8.

[0028] like Figure 2 and Figure 6 As shown, it also includes an adjusting rod 14, a connecting block 15, and a contact plate 16. The adjusting rod 14 is threaded onto the extrusion block 5, and the end of the adjusting rod 14 is connected to the connecting block 15. The contact plate 16 is rotatably connected to the connecting block 15. The contact plate 16 is limited to the adjusting rod 14 through the connecting block 15. The contact plate 16 contacts the side of the extrusion block 5 facing the center of the support plate 2.

[0029] like Figure 2 and Figure 6 As shown, it also includes a pressure sensor 17. The pressure sensor 17 is connected to the side of the contact plate 16 away from the extrusion block 5. The pressure sensor 17 is wrapped with a rubber sleeve. A controller is installed in the base 1. The controller is wired to the pressure sensor 17 and the motor 6. The pressure sensor 17 detects the pressure value between the contact plate 16 and the part in real time during the clamping process and feeds the data back to the controller.

[0030] like Figure 4 and Figure 5As shown, it also includes a roller 18. The end of the locking block 12 that mates with the groove 9 is rotatably connected to the roller 18. The roller 18 is rotatably connected to the rotating disk 8. During the angle adjustment of the support plate 2, the roller 18 rolls along the groove 9 on the outer ring of the rotating disk 8 with the locking block 12.

[0031] like Figure 2 As shown, it also includes a return sticker 19, which is attached to the sides of the base 1 and the support plate 2 respectively, and the two parts of the return sticker 19 are aligned vertically. The return sticker 19 is made of fluorescent material. When the support plate 2 is rotated to the initial zero position, the arrow marks of the two parts of the return sticker 19 are completely aligned, forming an intuitive visual reset indicator.

[0032] like Figure 1 As shown, it also includes a warning line 20. A warning line 20 is set in the middle of the top surface of the placement plate 3. When clamping, the operator aligns the edge of the part with the warning line 20 to achieve rapid rough positioning.

[0033] The operator places the part to be processed stably on the top surface of the placement plate 3 and observes the warning line 20 to ensure that the part is initially centered. According to the processing path requirements, the operator holds the pentagonal handle at the outer end of the threaded rod 10 and rotates it counterclockwise to loosen the threaded rod 10. As the threaded rod 10 moves outward along the base 1, its end pushes the slider 11 to slide towards the edge of the base 1. The return spring 13 gradually rebounds due to the reduced pressure, causing the locking block 12 to disengage from the groove 9 of the rotating disk 8. At this time, the support plate 2 is unlocked from the rotating disk 8, and the operator manually rotates the support plate 2 to the target angle. During the rotation, the locking block 12 slides in the groove 9 of the outer ring of the rotating disk 8, and the roller 18 rolls inside the groove 9 of the rotating disk 8, greatly reducing frictional resistance. After the support plate 2 is rotated into place, the pentagonal handle is tightened clockwise, the threaded rod 10 retracts into the base 1, pushes the slider 11 to slide towards the center, and compresses the return spring 13. The elastic restoring force of the reset spring 13 forces the locking block 12 to be tightly embedded in the corresponding groove 9 of the rotating disk 8, thereby achieving rigid locking between the rotating disk 8 and the support plate 2 and ensuring that the angle is stable and without deviation during the processing.

[0034] After the motor 6 is started, its output shaft drives the connecting rods 41 on both the front and rear sides to rotate synchronously. Through the meshing transmission of the bevel gear set 7, the connecting rods 41 on the left and right sides move in tandem. The four connecting rods 41 move in a parallelogram shape between the mounting plates 4, driving the extrusion block 5 to move towards the center of the part at a uniform speed along the slide rail on the placement plate 3. The contact plate 16 at the front end of the extrusion block 5 contacts the surface of the part first. When the pressure sensor 17 detects that the pressure values ​​in all directions have reached the preset threshold, the controller immediately cuts off the power to the motor 6, and the clamping action terminates. If the size of the part changes, the operator can manually rotate the adjusting rod 14 to change the extension distance between the contact plate 16 and the extrusion block 5 through the threaded transmission, quickly adapting to workpieces of different specifications. The pressure sensor 17, which is encased in a rubber sleeve, has the dual function of protecting the sensing element and preventing scratches on the surface of the part.

[0035] After processing, the operator loosens the threaded rod 10 counterclockwise to separate the clamping block 12 from the rotating disk 8. When the support plate 2 is manually rotated in the reverse direction, the return stickers 19 on both sides rotate with the support plate 2. When the base 1 is completely aligned with the return stickers 19 on the support plate 2, it indicates that the support plate 2 has returned to its initial zero position. The controller controls the motor 6 to reverse, and the connecting rod 41 drives the pressing block 5 to retract outward synchronously. The contact plate 16 gradually separates from the surface of the part until the part is completely released from constraint. The roller 18 intervenes again during the reset process of the rotating disk 8 to ensure that the support plate 2 rotates smoothly without jamming. After the part is removed, the warning line 20 is exposed again at the center of the placement plate 3, providing a visual centering reference for the next workpiece clamping, forming a complete processing cycle.

[0036] Please check the text above for logical errors, grammatical inconsistencies, typos, and unclear component references. Please point out the logical errors and grammatical inconsistencies, and provide suggestions for improvement, along with the revised version.

[0037] It should be understood that the above description is for illustrative purposes only and is not intended to limit the present invention. Those skilled in the art will understand that variations of the present invention will be included within the scope of the claims herein.

Claims

1. A precision positioning fixture for a CNC lathe used in musical instrument production, characterized in that: Includes a base (1) and connecting rods (41). A support plate (2) is rotatably connected to the base (1). A rotating assembly for adjusting the angle of the support plate (2) is provided between the base (1) and the support plate (2). A placement plate (3) is connected to the support plate (2). Several mounting plates (4) are installed on the support plate (2). Both ends of the four connecting rods (41) are rotatably connected to the mounting plates (4). Each of the four connecting rods (41) is connected to an extrusion block (5). Each of the four connecting rods (41) ends is provided with a bevel gear set (7). The extrusion block (5) is slidably connected to the placement plate (3). A motor (6) is installed on the mounting plate (4). One end of the connecting rods (41) at the front and rear ends is connected to the output shaft of the motor (6), and the other end is connected to the connecting rods (41) at the left and right ends respectively through the bevel gear set (7).

2. The precision positioning fixture for a CNC lathe used in musical instrument production according to claim 1, characterized in that: The rotating assembly includes a threaded rod (10), a rotating disk (8) is connected to the bottom of the support plate (2), the rotating disk (8) has several grooves (9) on its outer ring, the threaded rod (10) is threadedly connected to the base (1), a slider (11) is slidably connected inside the base (1), one side of the slider (11) is rotatably connected to the end of the threaded rod (10), and the other side of the slider (11) is slidably connected to a locking block (12), the locking block (12) is fitted with a return spring (13), one end of the return spring (13) is connected to the slider (11), and the other end is connected to the locking block (12), the locking block (12) is limited and engaged with the grooves (9) of the rotating disk (8).

3. A precision positioning fixture for a CNC lathe used in musical instrument production according to claim 2, characterized in that: It also includes a contact plate (16), an adjusting rod (14) is threadedly connected to the extrusion block (5), a connecting block (15) is connected to the end of the adjusting rod (14), the contact plate (16) is rotatably connected to the connecting block (15), the contact plate (16) is limited to the adjusting rod (14) through the connecting block (15), and the contact plate (16) contacts the side of the extrusion block (5) facing the center of the support plate (2).

4. A precision positioning fixture for a CNC lathe used in musical instrument production according to claim 3, characterized in that: A pressure sensor (17) is connected to the side of the contact plate (16) away from the extrusion block (5).

5. A precision positioning fixture for a CNC lathe used in musical instrument production according to claim 4, characterized in that: The end of the card block (12) that engages with the groove (9) is rotatably connected to a roller (18), and the roller (18) is rotatably connected to the rotating disk (8).

6. A precision positioning fixture for a CNC lathe used in musical instrument production according to claim 5, characterized in that: The alignment stickers (19) are respectively attached to the sides of the base (1) and the support plate (2), and the two parts of the alignment stickers (19) are aligned vertically.

7. A precision positioning fixture for a CNC lathe used in musical instrument production according to claim 6, characterized in that: A warning line (20) is provided in the middle of the top surface of the placement plate (3).

8. A precision positioning fixture for a CNC lathe used in musical instrument production according to claim 7, characterized in that: After the extrusion block (5) rotates, its top front and rear sides are in contact with the top surface of the placement plate (3). The threaded rod (10) has a plum blossom handle at one end extending out of the base (1). The pressure sensor (17) is wrapped with a rubber sleeve.

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