Speed change device for central spindle of digital drill

Abstract

The utility model provides a speed change device for a central spindle of a digital drill, which relates to the technical field of spindle speed change and comprises a box body, a servo motor component, a linear guide rail component, a driven shaft component and a hydraulic cylinder. According to the utility model, the main shaft adopts the synchronous belt wheel transmission, and the three groups of synchronous belt wheels are combined with the transmission input shafts with different speed ratios by controlling the driving motor, so that three groups of different main shaft speeds of high, medium and low can be realized, the output torque is expanded, and the requirement on the output torque characteristic when the main shaft is at a low speed is met; large holes can be drilled, the problems that the torque is not enough at low speed and the power of a spindle motor cannot be fully utilized are solved, the production efficiency and precision are improved, different machining requirements are met, the machining range is widened, the rotating speed is increased, and mechanical vibration and noise are reduced.

Description

Technical Field

[0001] This utility model relates to the field of spindle speed change, and in particular to a spindle speed change device for a digital drilling center. Background Technology

[0002] The spindle speed change system of a CNC drilling center is a crucial component of the machine tool. To improve machining accuracy and efficiency, the spindle speed change adjusts the spindle rotation speed to adapt to different machining requirements. To reduce energy consumption, a reasonable spindle speed change strategy can achieve constant linear velocity cutting and constant cutting force cutting, minimizing unnecessary energy consumption and achieving energy-saving effects. To adapt to different materials and machining requirements, the spindle speed change can be adjusted in real time according to the hardness, thickness, and other characteristics of the material being machined, ensuring the stability of the machining process.

[0003] When the spindle of the CNC drilling center rotates at low speed, the output torque of the spindle is insufficient, which results in the inability to complete drilling quickly when drilling larger holes, leading to the problem of the spindle motor power not being fully utilized. Utility Model Content

[0004] The technical problem this invention aims to solve is that when the spindle of a CNC drilling center rotates at low speed, the output torque of the spindle is insufficient, which results in the inability to quickly complete drilling when drilling larger holes, and consequently, the inefficient use of spindle motor power.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a speed change device for a digital drilling center spindle, including a housing, a servo motor assembly on one side of the housing, a linear guide rail assembly on one side of the housing, a driven shaft assembly on one side of the housing, a hydraulic cylinder on one side of the housing, a first drive shaft assembly on one side of the housing, a second drive shaft assembly on one side of the housing, a third drive shaft assembly on one side of the housing, a ball screw assembly on one side of the housing, and three sets of synchronous pulleys on one side of the housing.

[0006] The effect achieved by the above components is as follows: During operation, the hydraulic cylinder piston rod extends, lifting the servo motor assembly. The ball screw assembly drives the slide, which in turn moves the servo motor assembly along the guide rail. Based on the actual working conditions, an appropriate speed gear is selected, and then the spindle servo motor rotates, driving the drive shaft and synchronous pulley to rotate. The synchronous pulley drives the driven pulley and shaft to rotate. At this time, all three synchronous pulleys on the driven shaft rotate. Only one set of synchronous pulleys consumes the spindle motor power, while the other two sets do not consume the spindle motor power.

[0007] Preferably, the servo motor assembly includes a spindle motor, a connecting shaft, a motor mounting plate, and a bushing, and the connecting shaft has a flat, slotted shank.

[0008] The effect achieved by the above components is that the flat shank on the connecting shaft of the spindle servo motor allows the connecting shaft of the spindle motor to be better connected and fixed with other drive shafts.

[0009] Preferably, the linear guide rail assembly includes a guide rail, which is mounted on the housing. A slider is mounted on the guide rail, and a slide table is fixedly connected to the slider. A cylindrical pin is mounted on the slide table.

[0010] The effect achieved by the above components is that the linear guide rail assembly restricts the movement trajectory of the slide, causing the servo motor assembly to move along the guide rail direction.

[0011] Preferably, the driven shaft assembly includes a bearing housing, the driven shaft assembly includes three sets of drive shafts, each set of drive shafts has a tapered groove with a taper, the driven shaft assembly includes a driven shaft, and the driven shaft has three synchronous pulleys of different sizes.

[0012] The effect achieved by the above components is to facilitate the servo motor assembly to better drive different gears through multiple sets of driven shafts.

[0013] Preferably, the hydraulic cylinder is fixed to the slide by bolts, and the piston rod of the hydraulic cylinder is connected to the motor mounting plate.

[0014] The effect achieved by the above components is that the servo motor assembly is moved up and down by the hydraulic cylinder, so that the connecting shaft of the servo motor assembly can be engaged with the tapered groove of the drive shaft.

[0015] Preferably, the first drive shaft assembly, the second drive shaft assembly, and the third drive shaft assembly are identical, and each of the first drive shaft assembly, the second drive shaft assembly, and the third drive shaft assembly includes a bearing housing, a bearing, and a drive shaft.

[0016] The effect achieved by the above components is that the first drive shaft assembly, the second drive shaft assembly, and the third drive shaft assembly can be well connected to the servo motor after the servo motor assembly is adjusted in position.

[0017] Preferably, the ball screw assembly includes a motor base, a coupling, a lead screw, a transmission nut, and a bearing housing, and the lead screw is threadedly connected to the slide.

[0018] The effect achieved by the above components is as follows: the ball screw assembly drives the slide to move, and then the servo motor assembly on the slide is moved along the guide rail, thereby enabling the servo motor assembly to change gears more effectively.

[0019] Preferably, there are three sets of synchronous pulleys, and the three sets of synchronous pulleys are respectively connected to three sets of drive shafts and driven shafts.

[0020] The effect achieved by the above components is that, through the three sets of synchronous pulleys, only one set of synchronous pulleys needs to consume the power of the spindle motor, so that the power of the spindle is fully utilized.

[0021] In summary, the beneficial effects of this utility model are as follows:

[0022] The spindle adopts synchronous belt pulley drive, with three sets of synchronous belt pulleys. By controlling the drive motor to combine with the transmission input shaft with different speed ratios, three different spindle speeds (high, medium, and low) can be achieved, which expands the output torque and meets the requirements of the output torque characteristics at low spindle speeds. This enables drilling of larger holes and overcomes the problems of insufficient torque and underutilization of spindle motor power at low speeds. It improves production efficiency and accuracy, adapts to different processing needs, expands the processing range and speed, and reduces mechanical vibration and noise. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention;

[0025] Figure 2 This is a cross-sectional structural schematic diagram of the hydraulic cylinder of this utility model;

[0026] Figure 3 This is a schematic diagram of the cross-sectional structure of the synchronous belt pulley of this utility model;

[0027] Figure 4 This is a schematic diagram of the cross-sectional structure of the ball screw assembly of this utility model.

[0028] Legend: 1. Servo motor assembly; 2. Linear guide rail assembly; 3. Driven shaft assembly; 4. Hydraulic cylinder; 5. First drive shaft assembly; 6. Second drive shaft assembly; 7. Third drive shaft assembly; 8. Ball screw assembly; 9. Synchronous pulley; 10. Housing. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Figures 1 to 4 The spindle speed change device of a digital drilling center shown includes a housing 10, characterized in that: a servo motor assembly 1 is provided on one side of the housing 10, a linear guide rail assembly 2 is provided on one side of the housing 10, a driven shaft assembly 3 is provided on one side of the housing 10, a hydraulic cylinder 4 is provided on one side of the housing 10, a first drive shaft assembly 5 is provided on one side of the housing 10, a second drive shaft assembly 6 is provided on one side of the housing 10, a third drive shaft assembly 7 is provided on one side of the housing 10, a ball screw assembly is provided on one side of the housing 10, and three sets of synchronous pulleys 9 are provided on one side of the housing 10. During operation, the piston rod of hydraulic cylinder 4 extends, lifting servo motor assembly 1. Ball screw assembly 8 drives slide table, which moves servo motor assembly 1 along the guide rail. According to the actual working conditions, select the appropriate speed gear, and then the spindle servo motor rotates, driving the drive shaft and synchronous pulley 9 to rotate. Synchronous pulley 9 drives the driven pulley and shaft to rotate. At this time, all three synchronous pulleys on the driven shaft rotate. Only one set of synchronous pulleys 9 consumes spindle motor power, while the other two sets do not consume spindle motor power.

[0032] Figures 1 to 4 The servo motor assembly 1 shown includes a spindle motor, a connecting shaft, a motor mounting plate, and bushings. The connecting shaft has a flat, slotted shank. The flat, slotted shank on the connecting shaft on one side of the spindle servo motor allows for better connection and fixation of the spindle motor's connecting shaft to other drive shafts.

[0033] Figures 1 to 4 The linear guide assembly 2 shown includes a guide rail mounted on the housing 10. A slider is mounted on the guide rail, and a slide table is fixedly connected to the slider. A cylindrical pin is mounted on the slide table. The linear guide assembly 2 restricts the movement trajectory of the slide table, allowing the servo motor assembly 1 to move along the guide rail. The driven shaft assembly 3 includes a bearing housing and three sets of drive shafts. Each drive shaft has a tapered groove. The driven shaft assembly 3 also includes a driven shaft with three synchronous pulleys of different sizes. Multiple driven shafts facilitate better driving of different gears by the servo motor assembly 1.

[0034] Figures 1 to 4The hydraulic cylinder 4 shown is fixed to the slide table by bolts, and the piston rod of the hydraulic cylinder 4 is connected to the motor mounting plate. The hydraulic cylinder 4 is used to move the servo motor assembly 1 up and down, allowing the connecting shaft of the servo motor assembly 1 to engage with the tapered groove of the drive shaft. The first drive shaft assembly 5, the second drive shaft assembly 6, and the third drive shaft assembly 7 are identical, each including a bearing housing, a bearing, and a drive shaft. After the servo motor assembly 1 is adjusted in position, the first drive shaft assembly 5, the second drive shaft assembly 6, and the third drive shaft assembly 7 are well-connected to the servo motor.

[0035] Figures 1 to 4 The ball screw assembly 8 shown includes a motor base, a coupling, a lead screw, a transmission nut, and a bearing housing. The lead screw is threadedly connected to the slide. The ball screw assembly drives the slide to move, and then the servo motor assembly 1 on the slide is moved along the guide rail, allowing the servo motor assembly 1 to better change gears. There are three sets of synchronous pulleys 9, which are respectively connected to three sets of drive shafts and driven shafts. By using three sets of synchronous pulleys 9, only one set of synchronous pulleys 9 needs to drive and consume the spindle motor power, thus fully utilizing the spindle power.

[0036] Working principle: During operation, the piston rod of hydraulic cylinder 4 extends, lifting servo motor assembly 1. Ball screw assembly 8 drives the slide, and then the slide moves along the guide rail with servo motor assembly 1. According to the actual working conditions, the appropriate speed gear is selected. For example, when the spindle needs medium speed, the spindle motor stops at the medium speed gear. At this time, the direction of the flat shank of the connecting shaft of the spindle motor and the tapered groove of the drive shaft are consistent. The piston rod of hydraulic cylinder 4 retracts, servo motor assembly 1 descends, and the flat shank of the connecting shaft and the tapered groove of the drive shaft engage. The spindle motor rotates, driving the drive shaft and the intermediate synchronous pulley 9 to rotate. The intermediate synchronous pulley 9 drives the driven pulley and the shaft to rotate. At this time, all three synchronous pulleys on the driven shaft rotate. Only one set of synchronous pulleys 9 consumes the power of the spindle motor, while the other two sets do not consume the power of the spindle motor.

[0037] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A speed change device for a digital drilling center spindle, comprising a housing (10), characterized in that: A servo motor assembly (1) is provided on one side of the housing (10), a linear guide rail assembly (2) is provided on one side of the housing (10), a driven shaft assembly (3) is provided on one side of the housing (10), a hydraulic cylinder (4) is provided on one side of the housing (10), a first drive shaft assembly (5) is provided on one side of the housing (10), a second drive shaft assembly (6) is provided on one side of the housing (10), a third drive shaft assembly (7) is provided on one side of the housing (10), a ball screw assembly is provided on one side of the housing (10), and three sets of synchronous pulleys (9) are provided on one side of the housing (10).

2. The speed change device for a multi-spindle drilling center according to claim 1, characterized in that: The servo motor assembly (1) includes a spindle motor, a connecting shaft, a motor mounting plate, and a bushing. The connecting shaft has a flat shank.

3. The speed change device for a digital drilling center spindle according to claim 2, characterized in that: The linear guide rail assembly (2) includes a guide rail, which is mounted on the housing (10). A slider is mounted on the guide rail, and a slide table is fixedly connected to the slider. A cylindrical pin is mounted on the slide table.

4. The speed change device for a multi-drill center spindle according to claim 3, characterized in that: The driven shaft assembly (3) includes a bearing housing, the driven shaft assembly (3) includes three sets of drive shafts, each set of drive shafts has a tapered groove with a taper, the driven shaft assembly (3) includes a driven shaft, and the driven shaft has three synchronous pulleys of different sizes.

5. The speed change device for a multi-drill center spindle according to claim 4, characterized in that: The hydraulic cylinder (4) is fixed to the slide by bolts, and the piston rod of the hydraulic cylinder (4) is connected to the motor mounting plate.

6. The speed change device for a digital drilling center spindle according to claim 5, characterized in that: The first drive shaft assembly (5), the second drive shaft assembly (6), and the third drive shaft assembly (7) are the same, and each of the first drive shaft assembly (5), the second drive shaft assembly (6), and the third drive shaft assembly (7) includes a bearing housing, a bearing, and a drive shaft.

7. A speed change device for a digital drilling center spindle according to claim 6, characterized in that: The ball screw assembly (8) includes a motor base, a coupling, a lead screw, a transmission nut, and a bearing housing. The lead screw is threadedly connected to the slide.

8. The speed change device for a multi-drill center spindle according to claim 7, characterized in that: There are three sets of synchronous pulleys (9), and the three sets of synchronous pulleys (9) are respectively connected to three sets of drive shafts and driven shafts.

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