High-precision rotary table belt floating tensioning device and assembly method thereof

Abstract

The application belongs to the technical field of precision rotary table, and relates to a high-precision rotary table belt floating tensioning device and an assembling method thereof. The application comprises a precision rotary table installed on a marble platform, a driving motor, a belt and a transmission structure composed of a floating tensioning mechanism and a tension force balancing mechanism. The floating tensioning mechanism can automatically adjust the tensioning force according to the belt movement speed through two symmetrically installed swing arms, a tension spring and a tensioning wheel, so as to realize multi-stage and dynamic tensioning. The tension force balancing mechanism utilizes elastic idlers arranged on both sides of the rotary table and the motor belt pulley, and adjusts the elastic resultant force of the elastic idlers through a fine adjustment screw, so as to balance the radial force generated by the belt tensioning and reduce the influence of the radial force on the movement precision. The application solves the problems that the traditional belt tensioning mechanism cannot be dynamically adjusted and the radial force influences the precision, has the advantages of self-adaptive tensioning, high precision, good stability, overload protection and simple operation, and is suitable for the fields of high-precision machining and measurement.

Description

Technical Field

[0001] This invention belongs to the field of precision turntable technology, and relates to a high-precision turntable belt floating tensioning device and its assembly method. Background Technology

[0002] As industrial production develops towards higher precision and efficiency, the demand for rotary platforms in precision machining, measurement, and experimental fields is increasing daily. Especially in high-end manufacturing, aerospace, precision testing, and scientific research, precision rotary tables, as core equipment, play a crucial role. To meet the high precision and efficiency requirements of these fields, precision rotary tables must possess the following key characteristics: high load capacity, low friction, strong stability, high rotational accuracy, and reliable long-term operation. However, existing precision rotary tables still have some limitations in practical applications, restricting their use in specific fields. Belt drive is a key transmission method for stable and reliable precision rotary tables, but proper belt tension and belt tension balance are challenging problems.

[0003] In existing technologies, traditional belt tensioning mechanisms cannot adjust belt tension in multiple stages. During operation, they cannot dynamically change the tension on the slack side of the belt, nor can they balance or reduce the radial force generated by belt tension on the moving device. This force imbalance leads to reduced motion accuracy. Traditional belt tensioning mechanisms cannot adapt to belt elongation causing a decrease in tension and require periodic tensioning to maintain it. The belt cannot automatically tighten according to its speed, and the slack side cannot adjust its tension based on the tight side.

[0004] The utility model patent "A Novel Belt Tensioning Mechanism for a Paraffin Molding Machine" [CN223359816U] discloses a belt tensioning mechanism that allows precise adjustment of the vertical position of the tensioning wheel by rotating a lead screw, thereby achieving precise control of belt tension. The tension can be adjusted simply by rotating the lever, making operation simple and convenient. However, the aforementioned fixed-type belt tension adjustment cannot adjust the belt tension in a timely manner; the belt cannot autonomously adjust its tension according to the belt's movement speed; and it cannot reduce the impact of the radial force generated by belt tension on the moving device. Summary of the Invention

[0005] This invention addresses the problems of existing turntable belt drive devices, such as the inability to adjust belt tension in a timely manner, the inability of the belt to adjust its tension autonomously according to the belt's movement speed, the inability to reduce the impact of radial force generated by belt tension on the rotational accuracy of the motion device, difficult maintenance, and poor versatility. It proposes a high-precision turntable belt floating tensioning device, comprising: a marble platform; a precision turntable, a mounting bracket, and a motor bracket fixedly mounted on the marble platform; a drive motor mounted on the motor bracket; a motor pulley mounted on the output shaft of the drive motor; a belt sleeved between the pulley on the precision turntable and the motor pulley; and a mounting bracket positioned between the pulley on the precision turntable and the motor pulley.

[0006] The mounting bracket is equipped with a tension balancing mechanism and a floating tensioning mechanism.

[0007] The floating tensioning mechanism includes: two swing arms; the two swing arms are mounted on a mounting bracket via pins; a tension spring is provided between the two swing arms; two belt tensioning pulleys are also provided on each of the two swing arms; the two belt tensioning pulleys are arranged opposite each other on the outer side wall of the belt.

[0008] The two ends of the tension spring are respectively set on the two swing arms by two adjusting screws. The belt tensioning pulleys on the two swing arms clamp the belt with the tension springs facing each other, so that the belt is tensioned. The swing arms are provided with several adjusting threaded holes. The two swing arms are symmetrically arranged with respect to the line connecting the center of the pulley on the precision turntable and the center of the motor pulley. The adjusting threaded holes at corresponding positions on the two swing arms are symmetrically arranged in pairs with respect to the line connecting the center of the pulley on the precision turntable and the center of the motor pulley. Changing the position of the adjusting screws on the two swing arms will change the extension of the tension spring and produce different tension spring forces.

[0009] The tension balancing mechanism includes: one turntable idler wheel mounting block and one motor idler wheel mounting block; the turntable idler wheel mounting block and the motor idler wheel mounting block are mounted on a mounting bracket; two turntable elastic idler wheels are mounted on the turntable idler wheel mounting block; two motor elastic idler wheels are mounted on the motor idler wheel mounting block; the mounting bracket also includes one motor idler wheel adjusting block and one turntable idler wheel adjusting block; both the motor idler wheel adjusting block and the turntable idler wheel adjusting block have horizontally threaded fine-tuning screws; the turntable elastic idler wheels support the pulleys of the precision turntable, and the motor elastic idler wheels support the motor pulleys.

[0010] According to the high-precision turntable belt floating tensioning device described above, the swing arm has a pin through hole and a belt tensioning wheel threaded hole for mounting the belt tensioning wheel. The pin passes through the pin through hole to mount the swing arm on the mounting bracket. The swing arm can rotate around the pin in the pin through hole. The adjusting threaded holes for mounting tension springs on the swing arm are evenly distributed, and the distance between two adjacent adjusting threaded holes is equal. The swing arm is V-shaped. The pin is cylindrical, with an external thread at one end and a pin cap at the other end. The pin cap has an internal hexagonal slot. The bottom end face of the pin cap is the pin ring face, and the area between the external thread and the pin cap is the pin shaft section. A pin positioning step is provided at the connection between the external thread and the pin shaft section. The pin through hole for mounting the pin on the swing arm is clearance-fitted with the pin shaft section, and there is a gap between the upper end face of the swing arm and the ring face of the pin.

[0011] According to the high-precision turntable belt floating tensioning device described above, the cross-section of the mounting bracket is I-shaped, and the upper surface of the mounting bracket is the upper mounting surface of the mounting bracket; the upper mounting surface of the mounting bracket is provided with a plurality of motor idler wheel mounting block mounting threaded holes, a plurality of swing arm mounting threaded holes, a plurality of adjusting block mounting threaded holes, and a plurality of turntable idler wheel mounting block mounting threaded holes, which are respectively used to install the motor idler wheel mounting block, the two swing arms, the motor idler wheel adjusting block, the turntable idler wheel adjusting block, and the turntable idler wheel mounting block; the mounting reference surface of the bottom of the mounting bracket is provided with a plurality of mounting bracket mounting through holes for fixing it on the marble platform, and the width of the mounting reference surface of the mounting bracket is greater than that of the upper mounting surface of the mounting bracket.

[0012] According to the high-precision turntable belt floating tensioning device described above, the motor bracket is a rotary part with an I-shaped cross-section; the motor bracket mounting reference surface at the bottom of the motor bracket has several circumferentially distributed through holes for mounting and fixing the motor bracket on the marble platform; the motor bracket mounting surface at the top of the motor bracket has motor positioning blind holes and motor clearance blind holes for clearing the motor protrusion; the motor bracket mounting surface also has several circumferentially distributed through holes for mounting the drive motor; the outer diameter of the motor bracket mounting surface is smaller than the outer diameter of the motor bracket mounting reference surface.

[0013] According to the high-precision turntable belt floating tensioning device described above, the motor idler wheel adjusting block has a cubic structure. The motor idler wheel adjusting block has several vertically arranged countersunk holes for mounting the motor idler wheel adjusting block to the mounting bracket and horizontally arranged fine-tuning threaded holes for screwing fine-tuning screws. The axis of the countersunk holes for mounting the adjusting block is perpendicular to the axis of the fine-tuning threaded holes. The shape of the turntable idler wheel adjusting block is the same as that of the motor idler wheel adjusting block.

[0014] According to the high-precision turntable belt floating tensioning device described above, the motor idler wheel mounting block has a cubic structure, with a V-shaped groove on one side wall for preventing the motor pulley from slipping; the motor idler wheel mounting block has a vertically formed threaded hole for mounting the motor elastic idler wheel, and a mounting slot for fixing and adjusting the position of the motor idler wheel mounting block; the turntable idler wheel mounting block and the motor idler wheel mounting block have the same shape and are symmetrically arranged on the mounting bracket; the bottom surface of the motor idler wheel mounting block is the mounting reference surface of the mounting block.

[0015] According to the high-precision turntable belt floating tensioning device described above, the motor pulley is cylindrical, and a belt groove for installing the belt is opened on the cylindrical side wall of the motor pulley. Several pulley mounting countersunk holes are vertically arranged on the end face of the motor pulley, which are evenly distributed around its axis and match the mounting thread holes on the drive motor, and a pulley positioning through hole is coaxial with the motor pulley and has a clearance fit with the output shaft of the drive motor.

[0016] According to the high-precision turntable belt floating tensioning device described above, the belt tensioning wheel is cylindrical; its side wall is provided with a belt tensioning wheel groove for installing the belt; a screw is provided on the belt tensioning wheel, and the belt tensioning wheel is screwed into the belt tensioning wheel threaded hole on the swing arm through the screw.

[0017] According to the high-precision turntable belt floating tensioning device described above, elastic pads are fitted on the cylindrical sidewalls of the turntable elastic idler wheel and the motor elastic idler wheel.

[0018] The working end face of the precision turntable is provided with a precision turntable annular groove and several precision turntable threaded holes, and the precision turntable base is provided with a precision turntable through hole for installation and fixation.

[0019] The assembly method of the high-precision turntable belt floating tensioning device described above includes the following steps:

[0020] Step S1: Install the precision turntable, mounting bracket, and motor bracket on the marble platform respectively; install the drive motor on the motor bracket, and then install the motor pulley on the drive motor;

[0021] Among them: the mounting bracket is processed by wire electrical discharge machining, and after processing, it is heat treated and then the surface is precision ground. The flatness of the mounting reference surface of the mounting bracket is 2µm, and the parallelism between the mounting surface of the mounting bracket and the mounting reference surface of the mounting bracket is 4µm.

[0022] Install a dial indicator in the middle of the belt groove of the motor pulley, loosen the screw connecting the motor pulley and the drive motor, adjust the rotation center of the motor pulley according to the reading of the dial indicator, and slowly tighten the screw between the motor pulley and the drive motor so that the rotation center of the pulley coincides with the rotation center of the drive motor.

[0023] Step S2: Install two swing arms, a motor idler wheel mounting block, a turntable idler wheel mounting block, a motor idler wheel adjusting block, a turntable idler wheel adjusting block, and two pins on the mounting surface of the mounting bracket; install two motor elastic idler wheels and two turntable elastic idler wheels on the motor idler wheel mounting block and the turntable idler wheel mounting block respectively; install two belt tensioning pulleys on the two swing arms respectively; then install the belts into the belt grooves of the motor pulley and the precision turntable.

[0024] Specifically: the swing arm is machined by wire EDM and milling, and then heat-treated. After heat treatment, the surface of the swing arm and the pin through hole are precision ground; the parallelism between the bottom of the swing arm and the mounting reference surface of the mounting bracket is 2µm, the surface roughness of the mounting reference surface of the mounting bracket is 0.8µm, the perpendicularity between the pin through hole of the swing arm 6 and the mounting reference surface of the mounting bracket is 3µm, and the surface roughness of the pin through hole is 0.8µm;

[0025] Among them, the motor idler wheel mounting block and the turntable idler wheel mounting block are machined as a whole by wire EDM. After the overall shape is cut, it is centered and milled. After heat treatment, the surface is finely ground. The flatness of the mounting reference surface of the mounting block is 2µm, and the surface roughness of the mounting reference surface of the mounting block is 0.8µm.

[0026] Both the motor idler wheel adjusting block and the turntable idler wheel adjusting block are machined as a whole by wire EDM. The overall shape is cut and then centered, and the mounting surface is precision ground after milling.

[0027] Step S3: Install the tension spring, pull the two swing arms closer to the center and tighten them so that the two belt tensioning pulleys clamp the belt; loosen the fixing screws of the motor idler wheel mounting block and the turntable idler wheel mounting block, and loosen the two fine-tuning screws on the motor idler wheel adjusting block and the turntable idler wheel adjusting block respectively, so that the two fine-tuning screws abut against the motor idler wheel mounting block and the turntable idler wheel mounting block respectively, thereby generating elastic force on the two motor elastic idler wheels and the two turntable elastic idler wheels on the motor idler wheel mounting block and the turntable idler wheel mounting block; set the two dial indicators to the outer cylindrical surface of the belt groove of the precision turntable pulley and the belt groove of the motor pulley respectively;

[0028] Step S4: Adjust the two fine-tuning screws to make the readings of the two dial indicators the same before and after the belt is tensioned, so that the rotational accuracy of the precision turntable remains unchanged before and after the belt is tensioned.

[0029] Step S5: Adjust the elongation of the tension spring according to the load of the precision turntable. By changing the position of the adjusting screws on the two swing arms, that is, by changing the installation position of the adjusting screws in the adjusting threaded holes on the swing arms, the tension of the tension spring can be adjusted, thereby changing the belt tension. By changing the position of the two fine-tuning screws on the motor idler wheel mounting block and the turntable idler wheel mounting block, the elastic force generated by the two motor elastic idler wheels and the two turntable elastic idler wheels can be changed.

[0030] The beneficial effects of this invention are as follows:

[0031] 1. Significantly improves the motion accuracy and stability of the turntable. This invention effectively solves the problem of radial force affecting motion accuracy caused by uneven tension in traditional belt drives through an innovative tension balancing mechanism. In existing technologies, belt tensioning mechanisms cannot dynamically balance or reduce radial force, resulting in unbalanced forces on the moving device and decreased accuracy. This device sets elastic idler pulleys on both sides of the precision turntable pulley and the motor pulley, and adjusts their elastic force through fine-tuning screws to make their resultant force balance the belt tension force, thereby significantly reducing the impact of radial force on the rotation accuracy of the turntable and motor. Combined with the high rigidity and air-bearing structure of the precision turntable itself, it achieves long-term high-precision stable operation, and is particularly suitable for high-precision machining and measurement applications.

[0032] 2. Achieves multi-level adjustable and autonomous dynamic tensioning, improving transmission adaptability. Traditional tensioning mechanisms are typically fixed-adjustment, unable to adjust tension in real time according to belt movement, leading to belt slack or over-tightness. The floating tensioning mechanism of this invention employs a symmetrical swing arm, tension spring, and adjustable threaded hole structure. By changing the installation position of the tension spring on the two swing arms, multi-level tension adjustment can be achieved. More importantly, during operation, changes in the belt tension side distance cause the swing arm to rotate around the pin, dynamically adjusting the tension spring force accordingly, achieving autonomous tensioning based on belt speed. This adaptive mechanism ensures the belt always maintains appropriate tension, avoiding transmission failure due to belt elongation or speed changes, and improving system reliability under varying operating conditions.

[0033] 3. Simplified operation and maintenance, improving ease of use. Existing tensioning mechanisms often require frequent manual adjustments or belt replacements, which are cumbersome and experience-dependent. This invention integrates the tensioning and balancing mechanisms onto a modular mounting bracket, resulting in a compact structure and convenient adjustment. Tension can be adjusted simply by changing the position of the tension spring with adjusting screws, and the preload of the elastic idler pulley can be set with fine-tuning screws, making operation intuitive and repeatable. Furthermore, the swing arm and idler pulley mounting block adopt a standardized design, facilitating installation and replacement, reducing reliance on professional commissioning personnel, and minimizing equipment downtime for maintenance, making it particularly suitable for applications in continuous production industrial environments.

[0034] 4. Equipped with overload protection, enhancing device safety. Traditional rigid transmissions are prone to damage to the motor or transmission components under overload. This invention employs a belt drive combined with a floating tensioning mechanism. When the precision turntable is overloaded, the belt can slip controllably between the tension pulley and the belt pulley, thus protecting the drive motor and transmission system from damage. Simultaneously, the polyurethane elastic pad in the elastic idler pulley has excellent cushioning and energy absorption characteristics, absorbing part of the impact load and preventing damage to the precision structure from instantaneous overload. This protection mechanism not only extends the service life of the equipment but also reduces the risk of unexpected downtime due to overload, making it suitable for precision machining of high-value workpieces.

[0035] 5. Structural Optimization Enhances Environmental Adaptability. This invention incorporates several structural optimizations. For example, the mounting bracket features an I-beam design for increased rigidity; the motor bracket and idler wheel mounting block are symmetrically arranged for easy balance adjustment; and all key contact surfaces undergo precision machining and heat treatment to ensure long-term dimensional stability. The elastic idler wheel adapts to the cylindricity error of the pulley, reducing extreme dependence on the machining accuracy of parts. The entire device can be installed on a marble platform, utilizing its high stability and vibration reduction characteristics to further isolate external vibration interference. This integrated structure enables high-precision transmission within a limited space, making it suitable for various precision machine tools, measuring equipment, and experimental platforms. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of a high-precision turntable belt floating tensioning device according to the present invention.

[0037] Figure 2 This is a schematic diagram of the mounting bracket structure of a high-precision turntable belt floating tensioning device according to the present invention.

[0038] Figure 3 This is a schematic diagram of the motor support structure of a high-precision turntable belt floating tensioning device according to the present invention.

[0039] Figure 4 This is a schematic diagram of the swing arm structure of a high-precision turntable belt floating tensioning device according to the present invention.

[0040] Figure 5 This is a schematic diagram of the motor pulley structure of a high-precision turntable belt floating tensioning device according to the present invention.

[0041] Figure 6 This is a schematic diagram of the motor idler wheel mounting block structure of a high-precision turntable belt floating tensioning device according to the present invention.

[0042] Figure 7 This is a schematic diagram of the motor idler wheel adjustment block structure of a high-precision turntable belt floating tensioning device according to the present invention.

[0043] Figure 8 This is a schematic diagram of the pin structure of a high-precision turntable belt floating tensioning device according to the present invention.

[0044] Figure 9 This is a schematic diagram of the assembly structure of the floating tensioning mechanism and the tension force balancing mechanism of a high-precision turntable belt floating tensioning device according to the present invention.

[0045] Figure 10 This is a schematic diagram of machining a base disc using a high-precision turntable belt floating tensioning device according to the present invention.

[0046] In the diagram: 1: Marble platform; 2: Precision turntable; 3: Belt; 4: Turntable elastic idler wheel; 5: Pin; 5-1: Pin positioning step; 5-2: Pin shaft section; 5-3: Pin ring surface; 6: Swing arm; 6-1: Pin through hole; 6-2: Adjusting threaded hole; 6-3: Belt tensioner threaded hole; 6-4: Swing arm mounting reference surface; 7: Adjusting screw; 8: Belt tensioner; 9: Motor pulley; 9-1: Motor pulley belt groove; 9-2: Pulley mounting countersunk hole; 9-3: Pulley positioning through hole; 10: Drive motor; 11: Motor bracket; 11-1: Motor bracket mounting through hole; 11-2: Motor mounting through hole; 11-3: Motor positioning blind hole; 11-4: Motor clearance blind hole; 11-5: Motor bracket upper mounting surface; 11-6: Electric... 12: Motor idler wheel; 13: Motor idler wheel mounting block; 13-1: Motor idler wheel mounting block V-groove; 13-2: Motor idler wheel mounting threaded hole; 13-3: Mounting block mounting slot; 13-4: Mounting block mounting reference surface; 14: Motor idler wheel adjusting block; 14-1: Fine-tuning threaded hole; 14-2: Adjusting block mounting countersunk hole; 15: Tension spring; 16: Mounting bracket; 16-1: Mounting bracket mounting through hole; 16-2: Motor idler wheel mounting block mounting threaded hole; 16-3: Swing arm mounting threaded hole; 16-4: Adjusting block mounting threaded hole; 16-5: Turntable idler wheel mounting block mounting threaded hole; 16-6: Mounting surface of mounting bracket; 16-7: Mounting bracket mounting reference surface; 17: Fine-tuning screw; 18: Turntable idler wheel adjusting block; 19: Rotary table idler wheel mounting block; 20: Base disc; 21: Grinding spindle; 22: Base disc mounting shaft. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0048] like Figure 1As shown: A high-precision turntable belt floating tensioning device according to this embodiment includes: a marble platform 1; a precision turntable 2, a mounting bracket 16 and a motor bracket 11 are fixedly mounted on the marble platform 1; a drive motor 10 is mounted on the motor bracket 11; a motor pulley 9 is mounted on the output shaft of the drive motor 10; a belt 3 is sleeved between the pulley on the precision turntable 2 and the motor pulley 9; the mounting bracket 16 is disposed between the pulley on the precision turntable 2 and the motor pulley 9.

[0049] The mounting bracket 16 is equipped with a tension balancing mechanism and a floating tensioning mechanism.

[0050] The floating tensioning mechanism includes: two swing arms 6; the two swing arms 6 are mounted on the mounting bracket 16 via pins 5; a tension spring 15 is provided between the two swing arms 6; two belt tensioning pulleys 8 are also provided on the two swing arms 6 respectively; the two belt tensioning pulleys 8 are arranged opposite each other on the outer side wall of the belt 3.

[0051] The two ends of the tension spring 15 are respectively set on the two swing arms 6 by two adjusting screws 7. The belt tensioning pulleys 8 on the two swing arms 6 clamp the belt 3 with the tension spring 15, so that the belt 3 is tensioned. The swing arms 6 are provided with several adjusting threaded holes 6-2. The two swing arms 6 are symmetrically arranged with respect to the line connecting the center of the pulley on the precision turntable 2 and the center line of the motor pulley 9. The adjusting threaded holes 6-2 at corresponding positions on the two swing arms 6 are symmetrically arranged in pairs with respect to the line connecting the center of the pulley on the precision turntable 2 and the center line of the motor pulley 9. Changing the position of the adjusting screws 7 on the two swing arms 6 changes the extension of the tension spring 15, thereby generating different tension forces of the tension spring 15. The distance between the two belt tensioning pulleys 8 can be adjusted in time according to the spacing of the tension side of the belt 3 during movement. The tension spring 15 generates different extensions according to the spacing of the symmetrical adjusting threaded holes 6-2 on the two swing arms 6. The real-time extension of the tension spring 15 changes in real time according to the tension side of the belt 3.

[0052] The tension balancing mechanism includes: one turntable idler wheel mounting block 19 and one motor idler wheel mounting block 13; the turntable idler wheel mounting block 19 and the motor idler wheel mounting block 13 are mounted on a mounting bracket 16; two turntable elastic idler wheels 4 are mounted on the turntable idler wheel mounting block 19; two motor elastic idler wheels 12 are mounted on the motor idler wheel mounting block 13; the mounting bracket 16 also includes one motor idler wheel adjusting block 14 and one turntable idler wheel adjusting block 18; both the motor idler wheel adjusting block 14 and the turntable idler wheel adjusting block 18 are horizontally threaded with fine-tuning screws 17; the turntable elastic idler wheel on the turntable idler wheel mounting block 19... The idler wheel 4 supports the pulley of the precision turntable 2, and the motor elastic idler wheel 12 on the motor idler wheel mounting block 13 supports the motor pulley 9. Two fine-tuning screws 17 adjust and lock the positions of the motor idler wheel adjusting block 14 and the turntable idler wheel adjusting block 18, thereby adjusting the elastic force of the motor elastic idler wheel 12 and the turntable elastic idler wheel 4 on the motor idler wheel mounting block 13 and the turntable idler wheel mounting block 19 respectively pressing the motor pulley 9 and the pulley of the precision turntable 2. The resultant force of the elastic force of the motor elastic idler wheel 12 and the turntable elastic idler wheel 4 can balance or reduce the radial force of the belt 3 tension on the accuracy of the motion device.

[0053] like Figure 4 As shown: The swing arm 6 has a pin through hole 6-1 and a belt tensioner threaded hole 6-3 for installing the belt tensioner 8. The pin 5 passes through the pin through hole 6-1 to set the swing arm 6 on the mounting bracket 16; the swing arm 6 can rotate around the pin 5 in the pin through hole 6-1; the adjustment threaded holes 6-2 of the mounting tension spring 15 on the swing arm 6 are evenly distributed, and the distance between two adjacent adjustment threaded holes 6-2 is equal; the swing arm 6 has a V-shaped shape.

[0054] like Figure 8 As shown: the pin 5 is cylindrical, with an external thread at one end and a pin cap at the other end; the pin cap has an internal hexagonal slot; the bottom surface of the pin cap is the pin ring surface 5-3, and the area between the external thread and the pin cap is the pin shaft section 5-2; a pin positioning step 5-1 is provided at the connection between the external thread and the pin shaft section 5-2; the pin through hole 6-1 on the rocker arm 6, which is used to install the pin 5, is clearance-fitted with the shaft section 5-2 of the pin 5, and there is a gap between the upper end face of the rocker arm 6 and the ring surface 5-3 of the pin 5.

[0055] like Figure 2As shown: The cross-section of the mounting bracket 16 is I-shaped, and the upper surface of the mounting bracket 16 is the upper mounting surface 16-6. The upper mounting surface 16-6 of the mounting bracket has a number of motor idler wheel mounting block mounting threaded holes 16-2, a number of swing arm mounting threaded holes 16-3, a number of adjustment block mounting threaded holes 16-4, and a number of turntable idler wheel mounting block mounting threaded holes 16-5, which are used to install the motor idler wheel mounting block 13, the two swing arms 6, the motor idler wheel adjustment block 14, the turntable idler wheel adjustment block 18, and the turntable idler wheel mounting block 19, respectively. The mounting bracket mounting reference surface 16-7 at the bottom of the mounting bracket 16 has a number of mounting bracket mounting through holes 16-1 for fixing it on the marble platform 1. The mounting bracket mounting reference surface 16-7 of the mounting bracket 16 is wider than the upper mounting surface 16-6 of the mounting bracket, so that the mounting bracket 16 can be easily installed and fixed.

[0056] like Figure 3 As shown: The motor bracket 11 is a rotary part with an I-shaped cross section; the motor bracket mounting reference surface 11-6 at the bottom of the motor bracket 11 has several circumferentially distributed through holes 11-1 for mounting and fixing on the marble platform 1; the motor bracket mounting surface 11-5 at the top of the motor bracket 11 has a motor positioning blind hole 11-3 and a motor clearance blind hole 11-4 for clearing the motor protrusion; the motor bracket mounting surface 11-5 also has several circumferentially distributed through holes 11-2 for mounting the drive motor 10; the outer diameter of the motor bracket mounting surface 11-5 is smaller than the outer diameter of the motor bracket mounting reference surface 11-6, making it easier to install and fix the motor bracket 11.

[0057] like Figure 7 As shown: The motor idler wheel adjustment block 14 has a cubic structure. The motor idler wheel adjustment block 14 has several vertically arranged adjustment block mounting countersunk holes 14-2 for mounting the motor idler wheel adjustment block 14 to the mounting bracket 16 and horizontally arranged fine-tuning threaded holes 14-1 for screwing fine-tuning screws 17. The axis of the adjustment block mounting countersunk holes 14-2 is perpendicular to the axis of the adjustment block mounting countersunk holes 14-2. The turntable idler wheel adjustment block 18 has the same shape as the motor idler wheel adjustment block 14.

[0058] like Figure 6 As shown: The motor idler wheel mounting block 13 has a cubic structure, and a V-groove 13-1 for avoiding the motor pulley 9 is provided on one side wall; the idler wheel mounting block 13 has a vertically provided motor idler wheel mounting threaded hole 13-2 for mounting the motor elastic idler wheel 12, and a mounting block mounting slot 13-3 for fixing and adjusting the position of the motor idler wheel mounting block 13; the turntable idler wheel mounting block 19 has the same shape as the motor idler wheel mounting block 13 and is symmetrically arranged on the mounting bracket 16;

[0059] like Figure 5 As shown: The motor pulley 9 is cylindrical, and a belt groove 9-1 for mounting the belt 3 is provided on the cylindrical side wall of the motor pulley 9. The belt groove 9-1 can prevent the belt 3 from running off-center. Several pulley mounting countersunk holes 9-2 are vertically provided on the end face of the motor pulley 9, which are evenly distributed around its axis and match the mounting thread holes on the drive motor 10, and a pulley positioning through hole 9-3 is coaxial with the motor pulley 9 and has a clearance fit with the output shaft of the drive motor 10.

[0060] The belt tensioner 8 is cylindrical; its side wall has a belt tensioner groove for mounting the belt 3, which can prevent the belt 3 from running off-center; the belt tensioner 8 is provided with a screw, and the belt tensioner 8 is screwed into the belt tensioner threaded hole 6-3 on the swing arm 6 through the screw.

[0061] Elastic pads are fitted on the cylindrical sidewalls of the turntable elastic idler wheel 4 and the motor elastic idler wheel 12. The elastic pads can buffer and absorb energy and generate elastic force, and can automatically adapt to the cylindricity error of the precision turntable and pulley.

[0062] The working end face of the precision turntable 2 is provided with a precision turntable annular groove and several precision turntable threaded holes. The base of the precision turntable 2 is provided with a precision turntable through hole for mounting and fixing, and has a certain rigidity to withstand radial forces. The drive motor 10 has high rotational accuracy. A tension balancing mechanism and a floating tensioning mechanism are included. The tension balancing mechanism can reduce the impact of belt 3 tension on the motion accuracy of the precision turntable 2, prevent the rotation axis of the precision turntable 2 from shifting under force, and reduce the radial runout of the rotation axis of the precision turntable 2. The floating tensioning mechanism can automatically adjust the tension of belt 3 according to the movement speed of belt 3, and can also adjust the magnitude of belt 3 tension.

[0063] like Figure 9 As shown: An assembly method for a high-precision turntable belt floating tensioning device according to this embodiment includes the following steps:

[0064] Step 1: Install the precision turntable 2, mounting bracket 16, and motor bracket 11 on the marble platform 1 respectively; install the drive motor 10 on the motor bracket 11, and then install the motor pulley 9 on the drive motor 10; the precision turntable 2 is an air-bearing turntable with a rotation accuracy of 0.2µm and a certain rigidity to withstand radial forces. The working end face of the air-bearing turntable has two annular grooves and 12 M5 threaded holes, and the base of the air-bearing turntable has through holes for mounting and fixing; the drive motor 10 is a DJI gimbal motor GM6020, which has high rotation accuracy and can provide real-time feedback on motor speed, motor temperature, and rotation angle;

[0065] Mounting bracket 16 is made of 2Cr13 steel, machined by wire EDM and milling, and then heat-treated. After heat treatment, the surface is precision ground. Mounting bracket 16 has an I-shaped cross-section, with a length of 90mm, a width of 90mm, and a height of 58mm. Mounting bracket 16 has four mounting holes 16-1 for mounting and fixing the bracket. The mounting surface 16-6 has ten M5 threaded holes, symmetrically distributed, including two M5 swing arm mounting screws for mounting pins 5. The mounting bracket has four M5 adjustment block mounting threaded holes 16-4 for mounting the motor idler wheel adjustment block 14 and the turntable idler wheel adjustment block 18, and four M5 turntable idler wheel mounting block mounting threaded holes 16-5 for mounting the turntable idler wheel mounting block 19; the flatness of the mounting reference surface 16-7 of the mounting bracket is 2µm, the parallelism between the mounting surface 16-6 of the mounting bracket and the mounting reference surface 16-7 of the mounting bracket is 4µm, and the surface roughness of the mounting reference surface 16-7 of the mounting bracket and the mounting surface 16-6 of the mounting bracket is 0.8µm.

[0066] The motor bracket 11 is made of 2Cr13 steel and is machined by turning and milling. The height of the motor bracket 11 is 31mm. The diameter of the mounting surface 11-5 on the motor bracket is 68mm and the thickness is 6mm. The diameter of the mounting reference surface 11-6 on the motor bracket is 86mm and the thickness is 6mm. The mounting reference surface 11-6 on the motor bracket has three motor bracket mounting through holes 11-1 evenly distributed around the circumference with a diameter of 58mm for mounting and fixing the motor bracket 11. The mounting surface 11-5 on the motor bracket has a motor positioning blind hole 11-3 with a diameter of 22mm and a depth of 10mm and a motor clearance blind hole 11-4 with a diameter of 10mm and a depth of 4mm for clearing the protrusion of the drive motor 10. The mounting surface 11-5 on the motor bracket has four motor mounting through holes 11-2 evenly distributed around the circumference with a diameter of 74mm for mounting the drive motor 10. The outer diameter of the mounting surface 11-5 on the motor bracket is smaller than the outer diameter of the mounting reference surface 11-6 on the motor bracket, making it easier to install and fix the motor bracket 11.

[0067] The motor pulley 9 is made of aluminum with a sandblasted and anodized surface. Sandblasting and anodizing increase the friction between the motor pulley 9 and the belt 3 and enhance the surface strength of the motor pulley 9. The motor pulley 9 has a maximum diameter of 62mm and a thickness of 13mm. The belt groove 9-1 has a diameter of 60mm and a width of 11mm. The pulley positioning through hole 9-3 has a diameter of 22mm. The motor pulley 9 has three countersunk mounting holes 9-2, evenly distributed around a circumference with a diameter of 40mm, that match the mounting threaded holes on the drive motor. Both ends of the motor pulley 9 are convex to prevent belt slippage. The pulley positioning through hole 9-3 is used to position the motor pulley 9; the pulley positioning through hole 9-3 is clearance-fitted with the boss of the gimbal motor; the cylindricity at the belt groove 9-1 is 5µm; the coaxiality of the belt groove 9-1 and the pulley positioning through hole 9-3 is 5µm; a dial indicator is installed in the middle of the belt groove 9-1 of the motor pulley 9; the screws connecting the motor pulley 9 and the drive motor are loosened; the rotation center of the motor pulley 9 is adjusted according to the reading of the dial indicator; the three screws between the motor pulley 9 and the drive motor 10 are slowly tightened so that the rotation center of the pulley 9 coincides with the rotation center of the drive motor 10;

[0068] Step 2: Install two swing arms 6, a motor idler wheel mounting block 13, a turntable idler wheel mounting block 19, a motor idler wheel adjusting block 14, a turntable idler wheel adjusting block 18, and two pins 5 on the mounting surface 16-6 of the mounting bracket; install two motor elastic idler wheels 12 and two turntable elastic idler wheels 4 on the motor idler wheel mounting block 13 and the turntable idler wheel mounting block 19 respectively; install two belt tensioning pulleys 8 on the two swing arms 6 respectively; then install the belt 3 into the belt groove of the motor pulley 9 and the precision turntable 2.

[0069] The swing arm 6 is made of 2Cr13 steel and is machined by wire EDM and milling. After machining, it undergoes heat treatment, followed by precision grinding of the surface of the swing arm 6 and the pin through hole 6-1. The cross-section of the swing arm 6 is a V-shape with an included angle of 150 degrees, with a maximum length of 75 mm, a maximum width of 24 mm, and a thickness of 14 mm. It has four evenly spaced M4 adjustment threaded holes 6-2, one pin through hole 6-1 with a diameter of 8 mm, and one M6 belt tensioner threaded hole 6-3 for mounting the belt tensioner 8. The distance between the pin through hole 6-1 and the adjustment threaded hole 6-2 is 60 mm. The surface roughness of the swing arm mounting reference surface 6-4 is 0.8 µm. The perpendicularity between the pin through hole 6-1 of the swing arm 6 and the swing arm mounting reference surface 6-4 is 3 µm. The surface roughness of the pin through hole 6-1 is 0.8 µm.

[0070] The motor idler wheel mounting block 13 and the turntable idler wheel mounting block 19 have the same shape and are both made of 2Cr13 steel. They are machined as a single unit using wire EDM, with the outer shape cut as a whole and then centered. After milling, they undergo heat treatment and surface finishing. The motor idler wheel mounting block 13 has a cubic structure with a maximum length of 40mm, a width of 45mm, and a thickness of 15mm. One side wall has a 120-degree V-groove 13-1 to prevent the motor pulley 9 from running idle. The idler wheel mounting block 13 has two M6 motor idler wheel mounting threaded holes 13-2, and two mounting block mounting slots 13-3 for mounting, fixing and adjusting the position of the motor idler wheel mounting block 13; the flatness of the mounting block mounting reference surface 13-4 is 2µm, and the surface roughness of the mounting block mounting reference surface 13-4 is 0.8µm; the turntable idler wheel mounting block 19 is provided with a turntable idler wheel mounting block V-groove, a turntable idler wheel mounting threaded hole, and a turntable idler wheel mounting block mounting slot.

[0071] The motor idler adjustment block 14 and the turntable idler adjustment block 18 have the same shape and are both made of 2Cr13. They are machined as a whole by wire EDM. After the overall shape is cut, it is centered and the mounting surface is finely ground after wire EDM. The motor idler adjustment block 14 has a cubic structure. The motor idler adjustment block 14 has two adjustment block mounting countersunk holes 14-2 and one M5 fine adjustment threaded hole 14-1. The axis of the M5 fine adjustment threaded hole 14-1 and the axis of the two adjustment block mounting countersunk holes 14-2 are perpendicular to each other. The adjustment block mounting countersunk holes 14-2 are used to install and fix the motor idler adjustment block 14. The fine adjustment threaded hole 14-1 is used to install the fine adjustment screw 17 to finely adjust the position of the motor idler mounting block 13 so that the outer ring of the elastic pad of the motor elastic idler 12 contacts the motor pulley 9 of the drive motor 10.

[0072] The pin 5 is made of SKD61 and is cylindrical. One end of the pin 5 has an external thread, and the other end has a pin cap. The pin cap has an internal hexagonal slot. The bottom end face of the pin cap is the pin ring surface 5-3. The pin shaft section 5-2 is located between the external thread and the pin cap. A pin positioning step 5-1 is provided at the connection between the external thread and the pin shaft section 5-2. The pin shaft section 5-2 has a diameter of 8 mm, a length of 15 mm, and a surface roughness of 0.8 µm. The pin shaft section 5-2 and the pin through hole 6-1 of the rocker arm 6 are clearance-fitted, and there is a gap between the upper end face of the rocker arm 6 and the pin ring surface 5-3.

[0073] The cylindrical side wall of the belt tensioner 8 is provided with a belt tensioner groove for mounting the belt 3; the belt tensioner groove is 11mm wide and 25mm in diameter, and the belt tensioner groove can prevent the belt from running off-center; the belt tensioner 8 has its own screw that can be directly installed on the belt tensioner threaded hole 6-3 of the swing arm 6.

[0074] The height of the turntable elastic idler 4 and the motor elastic idler 12 are both 9mm, and the outer ring diameter is 25mm. Both the turntable elastic idler 4 and the motor elastic idler 12 have their own screws that can be installed in the turntable idler mounting thread hole and the motor idler mounting thread hole 13-2, respectively. The outer ring of the motor elastic idler 12 is provided with a polyurethane elastic pad, which can buffer and absorb energy, and can automatically adapt to the cylindricity error of the precision turntable 2 and the precision turntable pulley.

[0075] Step 3: The tension spring 15 is a single-hook light-load type with a wire diameter of 0.6mm and a length of 50mm. Install the tension spring 15, pull the two swing arms 6 together towards the center and tighten them, so that the two belt tensioning pulleys 8 clamp the belt 3; loosen the fixing screws of the motor idler wheel mounting block 13 and the turntable idler wheel mounting block 19, and loosen the two fine-adjusting screws 17 on the motor idler wheel adjusting block 14 and the turntable idler wheel adjusting block 18 respectively, so that the two fine-adjusting screws 17 abut against the motor idler wheel mounting block 13 and the turntable idler wheel mounting block 19 respectively, so that the two motor elastic idler wheels 12 and the two turntable elastic idler wheels 4 on the motor idler wheel mounting block 13 and the turntable idler wheel mounting block 19 generate elastic force, reducing the impact of the tension force generated by the belt 3 on the motion accuracy of the precision turntable 2 and the drive motor 10; set two dial indicators to the outer cylindrical surface of the precision turntable pulley and the belt groove 9-1 respectively.

[0076] Step 4: Based on the changes in the dial indicator readings, adjust the two fine-tuning screws 17 to ensure that the rotational accuracy of the precision turntable 2 remains constant before and after the belt 3 is tightened, and that the dial indicator readings are the same before and after the belt 3 is tightened; based on the changes in the dial indicator readings, rotate and adjust the two fine-tuning screws 17 to ensure that the rotational accuracy of the motor pulley 9 remains constant before and after the belt 3 is tightened, and that the dial indicator readings are the same before and after the belt 3 is tightened, so that the combined elastic force of the two motor elastic idler pulleys 12 and the two turntable elastic idler pulleys 4 forms a pair of balanced forces with the tension force of the belt 3; finally, tighten the fixing screws of the motor idler pulley mounting block 13 and the turntable idler pulley mounting block 19.

[0077] Step 5: Adjust the elongation of the tension spring 15 in a timely manner according to the load of the precision turntable 2. By changing the position of the adjusting screw 7 on the two swing arms 6, that is, changing the installation position of the adjusting screw 7 on the tension spring 15 on the swing arm 6 in the adjusting thread hole 6-2, the tension of the tension spring 15 can be adjusted, thereby changing the tension of the belt 3.

[0078] like Figure 10 As shown in the figure, a high-precision turntable belt floating tensioning device of this embodiment is used for automatic grinding of the outer cylindrical surface of the base disk 20. The specific processing method is as follows:

[0079] Step 1: Install the precision rotary table 2 onto the position of the grinding device for the outer cylindrical surface of the grinding base disk 20; install a base disk mounting shaft 22 on the working surface of the precision rotary table 2, use a spiral ball bushing to mount the base disk 20, and then use a cross washer, a flat washer and a lock nut to tighten the base disk 20.

[0080] Step 2: Turn on the drive motor 10 to make the precision turntable 2 rotate. The precision turntable 2 drives the base disk 20 to rotate. The grinding spindle 21 of the outer cylindrical surface grinding device rotates to drive the grinding wheel to grind the outer cylindrical surface of the base disk 20. Wherein, the rotation speed of the grinding spindle 21 and the rotation speed of the precision turntable 2 are coprime.

[0081] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-precision turntable belt floating tensioning device, characterized in that, include: A marble platform (1); a precision turntable (2), a mounting bracket (16) and a motor bracket (11) are fixedly installed on the marble platform (1); a drive motor (10) is installed on the motor bracket (11); a motor pulley (9) is installed on the output shaft of the drive motor (10); a belt (3) is sleeved between the pulley on the precision turntable (2) and the motor pulley (9); the mounting bracket (16) is installed between the pulley on the precision turntable (2) and the motor pulley (9); The mounting bracket (16) is equipped with a tension balancing mechanism and a floating tensioning mechanism; The floating tensioning mechanism includes: two swing arms (6); the two swing arms (6) are mounted on the mounting bracket (16) via pins (5); a tension spring (15) is provided between the two swing arms (6); two belt tensioning pulleys (8) are also provided on the two swing arms (6); the two belt tensioning pulleys (8) are arranged opposite each other on the outer side wall of the belt (3); The two ends of the tension spring (15) are respectively set on the two swing arms (6) by two adjusting screws (7). The belt tensioning pulleys (8) on the two swing arms (6) clamp the belt (3) in opposite directions through the tension spring (15) to make the belt (3) tensioned. The swing arms (6) are provided with several adjusting threaded holes (6-2). The two swing arms (6) are symmetrically arranged with the line connecting the center of the pulley on the precision turntable (2) and the center of the motor pulley (9). The adjusting threaded holes (6-2) at corresponding positions of the two swing arms (6) are symmetrically arranged in pairs with the line connecting the center of the pulley on the precision turntable (2) and the center of the motor pulley (9). By changing the position of the adjusting screws (7) on the two swing arms (6), different tension of the tension spring (15) can be generated by changing the elongation of the tension spring (15). The tension balancing mechanism includes: a turntable idler wheel mounting block (19) and a motor idler wheel mounting block (13); the turntable idler wheel mounting block (19) and the motor idler wheel mounting block (13) are mounted on a mounting bracket (16); two turntable elastic idler wheels (4) are mounted on the turntable idler wheel mounting block (19); two motor elastic idler wheels (12) are mounted on the motor idler wheel mounting block (13); a motor idler wheel adjusting block (14) and a turntable idler wheel adjusting block (18) are also mounted on the mounting bracket (16); both the motor idler wheel adjusting block (14) and the turntable idler wheel adjusting block (18) are horizontally threaded with fine-tuning screws (17); the turntable elastic idler wheel (4) supports the precision turntable (2). A pulley and a motor idler wheel (12) support the motor pulley (9); the swing arm (6) has a pin through hole (6-1) and a belt tension wheel threaded hole (6-3) for installing the belt tension wheel (8); the pin (5) passes through the pin through hole (6-1) to set the swing arm (6) on the mounting bracket (16); the swing arm (6) can rotate around the pin (5) in the pin through hole (6-1); the adjustment threaded holes (6-2) of the mounting tension spring (15) on the swing arm (6) are evenly distributed, and the distance between two adjacent adjustment threaded holes (6-2) is equal; the swing arm (6) is V-shaped; the pin (5) is cylindrical, with an external thread at one end and a pin cap at the other end. The pin cap has an internal hexagonal slot; the bottom surface of the pin cap is the pin ring surface (5-3), and the external thread is the pin shaft section (5-2) between the pin cap and the external thread; a pin positioning step (5-1) is provided at the connection between the external thread and the pin shaft section (5-2); the pin through hole (6-1) on the swing arm (6) for mounting the pin (5) is clearance-fitted with the shaft section (5-2) of the pin (5), and there is a gap between the upper end face of the swing arm (6) and the ring surface (5-3) of the pin (5); the cross section of the mounting bracket (16) is I-shaped, and the upper surface of the mounting bracket (16) is the mounting surface (16-6); a number of motor idler wheel mounting block mounting threads are provided on the mounting surface (16-6). Hole (16-2), several swing arm mounting threaded holes (16-3), several adjusting block mounting threaded holes (16-4), and several turntable idler wheel mounting block mounting threaded holes (16-5) are used to install motor idler wheel mounting block (13), two swing arms (6), motor idler wheel adjusting block (14), turntable idler wheel adjusting block (18), and turntable idler wheel mounting block (19), respectively; a number of mounting bracket mounting through holes (16-1) are provided on the mounting bracket mounting reference surface (16-7) at the bottom of the mounting bracket (16) for fixing it on the marble platform (1), and the width of the mounting bracket mounting reference surface (16-7) of the mounting bracket (16) is greater than the mounting surface (16-6) on the mounting bracket.

2. The high-precision turntable belt floating tensioning device according to claim 1, characterized in that, The motor bracket (11) is a rotary part with an I-shaped cross section; the motor bracket mounting reference surface (11-6) at the bottom of the motor bracket (11) is provided with several circumferentially distributed motor bracket mounting through holes (11-1) for mounting and fixing on the marble platform (1); the motor bracket mounting surface (11-5) at the top of the motor bracket (11) is provided with a motor positioning blind hole (11-3) and a motor clearance blind hole (11-4) for clearing the motor protrusion; the motor bracket mounting surface (11-5) is also provided with several circumferentially distributed motor mounting through holes (11-2) for mounting the drive motor (10); the outer diameter of the motor bracket mounting surface (11-5) on the motor bracket (11) is smaller than the outer diameter of the motor bracket mounting reference surface (11-6).

3. The high-precision turntable belt floating tensioning device according to claim 2, characterized in that, The motor idler wheel adjustment block (14) has a cubic structure. The motor idler wheel adjustment block (14) has several vertically arranged adjustment block mounting countersunk holes (14-2) for mounting the motor idler wheel adjustment block (14) onto the mounting bracket (16) and horizontally arranged fine adjustment thread holes (14-1) for screwing fine adjustment screws (17). The axis of the adjustment block mounting countersunk hole (14-2) is perpendicular to the axis of the fine adjustment thread hole (14-1). The turntable idler wheel adjustment block (18) has the same shape as the motor idler wheel adjustment block (14).

4. The high-precision turntable belt floating tensioning device according to claim 3, characterized in that, The motor idler mounting block (13) has a cubic structure, and a V-groove (13-1) for the motor idler mounting block to avoid the motor pulley (9) is provided on one side wall; the motor idler mounting block (13) has a vertically provided motor idler mounting threaded hole (13-2) for mounting the motor elastic idler (12), and a mounting block mounting slot (13-3) for fixing and adjusting the position of the motor idler mounting block (13); the turntable idler mounting block (19) has the same shape as the motor idler mounting block (13) and is symmetrically arranged on the mounting bracket (16); the bottom surface of the motor idler mounting block (13) is the mounting block mounting reference surface (13-4).

5. A high-precision turntable belt floating tensioning device according to claim 4, characterized in that, The motor pulley (9) is cylindrical. A belt groove (9-1) for mounting the belt (3) is provided on the cylindrical side wall of the motor pulley (9). Several pulley mounting countersunk holes (9-2) are vertically provided on the end face of the motor pulley (9) and are evenly distributed around its axis and matched with the mounting thread holes on the drive motor (10). A pulley positioning through hole (9-3) is coaxial with the motor pulley (9) and has clearance matching with the output shaft of the drive motor (10).

6. A high-precision turntable belt floating tensioning device according to claim 5, characterized in that, The belt tensioner (8) is cylindrical; its side wall has a belt groove for installing the belt (3); a screw is provided on the belt tensioner (8), and the belt tensioner (8) is screwed into the belt tensioner thread hole (6-3) on the swing arm (6) through the screw.

7. A high-precision turntable belt floating tensioning device according to claim 6, characterized in that, Elastic pads are fitted on the cylindrical sidewalls of the turntable elastic idler wheel (4) and the motor elastic idler wheel (12); The working end face of the precision turntable (2) is provided with a precision turntable annular groove and several precision turntable threaded holes, and the base of the precision turntable (2) is provided with a precision turntable through hole for installation and fixation.

8. The assembly method of a high-precision turntable belt floating tensioning device according to claim 7, characterized in that: Includes the following steps: Step S1: Install the precision turntable (2), mounting bracket (16) and motor bracket (11) on the marble platform (1); install the drive motor (10) on the motor bracket (11), and then install the motor pulley (9) on the drive motor (10). Among them: the mounting bracket (16) is machined by wire EDM and milling, and then heat-treated. After heat treatment, the surface is precision ground. The flatness of the mounting reference surface (16-7) of the mounting bracket is 2µm, and the parallelism between the mounting surface (16-6) on the mounting bracket and the mounting reference surface (16-7) of the mounting bracket is 4µm. Install a dial indicator in the middle of the belt groove (9-1) of the motor pulley (9), loosen the screw connecting the motor pulley (9) and the drive motor (10), adjust the rotation center of the motor pulley (9) according to the reading of the dial indicator, and slowly tighten the screw between the motor pulley (9) and the drive motor (10) so that the rotation center of the pulley (9) coincides with the rotation center of the drive motor (10); Step S2: Install two swing arms (6), a motor idler wheel mounting block (13), a turntable idler wheel mounting block (19), a motor idler wheel adjusting block (14), a turntable idler wheel adjusting block (18), and two pins (5) on the mounting surface (16-6) of the mounting bracket; install two motor elastic idler wheels (12) and two turntable elastic idler wheels (4) on the motor idler wheel mounting block (13) and the turntable idler wheel mounting block (19), respectively; install two belt tensioning pulleys (8) on the two swing arms (6), respectively; then install the belt (3) in the belt groove of the motor pulley (9) and the precision turntable (2); Among them: the swing arm (6) is machined by wire EDM and milling, and then heat-treated. After heat treatment, the surface of the swing arm (6) and the pin through hole (6-1) are precision ground; the surface roughness of the swing arm mounting reference surface (6-4) is 0.8µm, the perpendicularity of the pin through hole (6-1) of the swing arm 6 to the swing arm mounting reference surface (6-4) is 3µm, and the surface roughness of the pin through hole (6-1) is 0.8µm; Among them: the motor idler wheel mounting block (13) and the turntable idler wheel mounting block (19) are both machined as a whole by wire EDM. After the overall shape is cut, it is cut in the center, milled and then heat-treated. After heat treatment, the surface is finely ground. The flatness of the mounting reference surface (13-4) of the mounting block is 2µm, and the surface roughness of the mounting reference surface (13-4) of the mounting block is 0.8µm. The motor idler wheel adjustment block (14) and the turntable idler wheel adjustment block (18) are both machined as a whole by wire EDM. After the overall shape is cut, it is cut in the center and then milled and the mounting surface is finely ground. Step S3: Install the tension spring (15), pull the two swing arms (6) together towards the center and tighten them so that the two belt tensioning pulleys (8) clamp the belt (3); loosen the fixing screws of the motor idler wheel mounting block (13) and the turntable idler wheel mounting block (19), and loosen the two fine adjustment screws (17) on the motor idler wheel adjusting block (14) and the turntable idler wheel adjusting block (18) respectively, so that the two fine adjustment screws (17) abut against the motor idler wheel mounting block (13) and the turntable idler wheel mounting block (19) respectively, so that the two motor elastic idler wheels (12) and the two turntable elastic idler wheels (4) on the motor idler wheel mounting block (13) and the turntable idler wheel mounting block (19) generate elastic force; put two dial indicators on the outer cylindrical surface of the belt groove of the precision turntable pulley and the belt groove (9-1) of the motor pulley respectively; Step S4: By adjusting the two fine adjustment screws (17), the data of the two dial indicators are the same before and after the belt (3) is tightened, so that the rotation accuracy of the precision turntable (2) remains unchanged before and after the belt (3) is tightened; Step S5: Adjust the elongation of the tension spring (15) in a timely manner according to the load of the precision turntable (2). By changing the position of the adjusting screw (7) of the tension spring (15) on the two swing arms (6), that is, by changing the installation position of the adjusting screw (7) on the adjusting thread hole (6-2) on the swing arm (6), the tension of the tension spring (15) can be adjusted, thereby changing the tension of the belt (3). By changing the position of the two fine adjustment screws (17) on the motor idler wheel mounting block (13) and the turntable idler wheel mounting block (19), the elastic force generated by the two motor elastic idler wheels (12) and the two turntable elastic idler wheels (4) can be changed.

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