Multi-stage gear transmission precision turntable

Abstract

The present application relates to a kind of multi-stage gear transmission precision rotary table, including driving device, transmission assembly, main shaft, accurate control device and brake device, the driving device is connected with the main shaft drive by the transmission assembly, the main shaft is equipped with table top, the transmission assembly includes gear four, the gear four is installed on the main shaft, the accurate control device is used to lock the main shaft, the brake device is used to brake the gear four.Driving device is realized 360 ° rotation by transmission assembly with main shaft, overall structure is compact, small space occupation, long service life, transmission assembly maintenance is simple, and maintenance cost is low;Power transmission is passed to main shaft and table top by transmission assembly to driving device, the rotational speed of main shaft is reduced, torque is substantially improved, guarantee table top stable rotation, guarantee the normal processing of workpiece on table top;More accurate angle adjustment is realized to main shaft by setting accurate control device and brake device, meet the braking demand when using.

Description

Technical Field

[0001] This invention relates to the field of rotary table technology, and more specifically to a precision rotary table with multi-stage gear transmission. Background Technology

[0002] A rotary table is a machine tool accessory with a rotatable surface used to clamp workpieces and achieve rotation and indexing positioning; it is often simply called a rotary table. Currently, most rotary tables on the market use a worm gear transmission structure. In a worm gear drive, the rotating helical surface of the worm drives the worm wheel teeth. The friction between the two is sliding friction, resulting in significant frictional resistance. This frictional resistance generates a resisting torque on the worm, leading to severe wear on the tooth surface and the generation of a large amount of heat. To dissipate heat and reduce wear, expensive materials with good anti-friction and wear-resistant properties, as well as excellent lubrication devices, are required, thus increasing costs. Furthermore, the high speed of the worm results in a large power loss due to the resisting torque, leading to low transmission efficiency in worm gear drives, typically only 0.7–0.8. If the worm gear drive also has a self-locking function, its efficiency will be below 0.5. Due to the low efficiency and severe wear of worm gear drives, they are not suitable for long-term continuous operation at high power, and long-term use makes it difficult to guarantee accuracy. Summary of the Invention

[0003] This invention addresses the existing technical problems by providing a precision rotary table with multi-stage gear transmission.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a precision rotary table with multi-stage gear transmission, including a drive device, a transmission assembly, a main shaft, a precision control device and a braking device, wherein the drive device is connected to the main shaft through the transmission assembly, the main shaft is provided with a table surface, the transmission assembly includes a fourth gear, the fourth gear is mounted on the main shaft, the precision control device is used to lock the main shaft, and the braking device is used to brake the fourth gear.

[0005] Based on the above technical solution, in order to achieve ease of use and stability of the equipment, the present invention can also make the following improvements to the above technical solution:

[0006] Preferably, the braking device includes a drive cylinder, a brake block, a brake plate, a support shaft, and a reset component. The output end of the drive cylinder is connected to the brake block. The brake block has an inclined surface one. The support shaft is located on one side of the gear four. The brake plate is rotatably mounted on the support shaft. One side of the brake plate has an inclined surface two corresponding to the inclined surface one, and the other side has brake teeth. The brake teeth are used to engage with the gear four. The reset component is used to reset the brake plate.

[0007] Preferably, it further includes a mounting plate and a guide key, the guide key being mounted on the mounting plate, and the brake block being slidably connected to the guide key.

[0008] Preferably, the reset component is a second reset spring, one end of which is located inside the mounting plate and the other end is located inside the receiving groove on the brake plate, the receiving groove being located on the same side as the second inclined surface.

[0009] Preferably, the second inclined surface is provided with a contact protrusion, and the first inclined surface is in contact with the contact protrusion.

[0010] Preferably, the precision control device is mounted on the main shaft and located below the fourth gear. The precision control device includes an expansion sleeve, a mounting sleeve, a piston, an oil inlet ring, and an air inlet. The piston is located inside the mounting sleeve. One end of the piston is provided with an expansion sleeve located inside the mounting sleeve, and the other end is provided with the oil inlet ring. A cavity is provided between the oil inlet ring and the piston. The oil inlet ring is provided with an air inlet communicating with the cavity. The expansion sleeve is sleeved on the shaft of the main shaft. The expansion sleeve is provided with an outer inclined surface, and the piston is provided with an inner inclined surface, the inner inclined surface corresponding to the outer inclined surface.

[0011] Preferably, it also includes a return spring, one end of which abuts against the expansion sleeve and the other end of which abuts against the piston.

[0012] Preferably, it also includes a housing and a bottom cover disposed at the bottom of the housing. The drive device, the transmission assembly and the braking device are all disposed in the housing. The housing is provided with a groove for accommodating the main shaft. The main shaft is rotatably disposed in the groove. A dustproof ring is provided on the outer edge of the main shaft.

[0013] Preferably, the spindle, the drive device, and the transmission assembly are arranged in a triangular configuration.

[0014] Preferably, the transmission assembly includes a first synchronous pulley, a second synchronous pulley, a first gear, a second gear, and a third gear. The output end of the drive device is connected to the first synchronous pulley. The first synchronous pulley is connected to the second synchronous pulley via a transmission belt. The second synchronous pulley and the third gear are coaxially arranged. The first gear meshes with the second gear. The second gear and the third gear are coaxially arranged. The third gear meshes with the fourth gear.

[0015] The beneficial effects of this invention are as follows: the drive device achieves 360° rotation of the spindle through the transmission assembly, resulting in a compact overall structure, small footprint, long service life, simple maintenance and low repair costs for the transmission assembly, and a transmission efficiency of approximately 0.95, thus improving transmission efficiency; the transmission assembly transmits the power of the drive device to the spindle and the table, reducing the spindle speed and significantly increasing the torque, ensuring stable rotation of the table and normal processing of the workpiece on the table; the braking device enables braking of the spindle and table at a specified angle, and the precise control device achieves a turntable accuracy of 0.01 degrees. Attached Figure Description

[0016] Figure 1 This is a top view of the precision turntable of the present invention;

[0017] Figure 2 for Figure 1 Sectional view at point AA;

[0018] Figure 3 This is a top view of the precision control device of the present invention;

[0019] Figure 4 for Figure 3 Sectional view at point BB;

[0020] Figure 5 This is a schematic diagram of the braking device of the present invention;

[0021] Figure 6 for Figure 5 Sectional view at CC;

[0022] Figure 7 for Figure 5 Sectional view at point DD;

[0023] Figure 8 This is a schematic diagram of the brake pad.

[0024] The attached diagram is labeled as follows: 101, Servo motor; 102, Synchronous pulley one; 103, Synchronous pulley two; 104, Gear one; 105, Gear two; 106, Gear three; 107, Gear four; 108, Roller bearing; 109, Needle roller bearing one; 110, Main shaft; 111, Housing; 112, Bottom cover; 113, Dustproof ring; 114, Gear shaft; 115, Fixed shaft; 116, Bearing one;

[0025] 200. Precision control device; 201. Expansion sleeve; 202. Return spring one; 203. Mounting sleeve; 204. Piston; 205. Oil inlet ring; 206. Bearing two; 207. Sealing ring one; 208. End cover; 209. Sealing ring two; 210. Sealing ring three; 211. Air inlet;

[0026] 300. Braking device; 301. Drive cylinder; 302. Mounting plate; 303. Brake block; 304. Brake plate; 304.1. Brake tooth; 304.2. Inclined surface two; 304.3. Receiving groove; 305. Return spring two; 306. Support shaft; 307. Needle roller bearing two; 308. Cover; 309. Guide key. Detailed Implementation

[0027] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0028] like Figures 1 to 8 As shown, this invention discloses a precision rotary table with multi-stage gear transmission, including a drive device, a transmission assembly, a spindle 110, a precision control device, and a braking device 300. The drive device is connected to the spindle 110 via the transmission assembly. The spindle 110 has a table for mounting the workpiece to be processed. The transmission assembly includes a gear 107, which is mounted on the spindle 110 below the table. The precision control device 200 is used to lock the spindle 110, and the braking device 300 is used to brake the gear 107.

[0029] The braking device 300 includes a drive cylinder 301, a brake block 303, a brake plate 304, a support shaft 306, and a reset component. The output end of the drive cylinder 301 is connected to the brake block 303. The brake block 303 has an inclined surface 1. The support shaft 306 is located on one side of the gear 4 107. The brake plate 304 is rotatably mounted on the support shaft 306 via a needle roller bearing 2 307. The end of the support shaft 306 is provided with a cover 308. One side of the brake plate 304 has an inclined surface 2 304.2 corresponding to the inclined surface 1, and the other side has a concave arc-shaped surface. The arc-shaped surface has outwardly protruding brake teeth 304.1. The brake teeth 304.1 are used to engage with the gear 4 107. The brake teeth 304.1 and the gear 4 107 have the same module and pressure angle and mesh with each other to ensure the accuracy of the stopping position. The reset component is used to reset the brake plate 304. The concave arc surface creates clearance space, ensuring that gear 4107 rotates normally.

[0030] The drive cylinder 301 drives the brake block 303 to move. The inclined surface 1 on the brake block 303 presses against the inclined surface 2 304.2, causing the brake plate 304 to rotate around the support shaft 306. The brake tooth 304.1 engages with the gear 4 107, causing the gear 4 107 to stop rotating, thus achieving braking of the main shaft 110 and the table.

[0031] The gear 107 has 360 teeth.

[0032] In this embodiment, the gear 107 has 360 teeth evenly distributed along the circumference, with each tooth corresponding to 1 degree, so that the rotation and braking angle of the main shaft 110 is accurate to 1 degree.

[0033] In an optional embodiment, the precision turntable further includes a mounting plate 302 and a guide key 309, wherein the drive cylinder 301 is mounted on the end of the mounting plate 302, the guide key 309 is mounted on the mounting plate 302, and the brake block 303 is slidably connected to the guide key 309.

[0034] It should be noted that the brake block 303 is provided with a guide groove, and the guide key 309 is installed in the guide groove. The brake block 303 moves along the guide key 309. The guide key 309 and the guide groove cooperate to guide the brake block 303, ensuring the stability of the movement of the brake block 303 and ensuring the squeezing effect of the brake block 303 on the brake plate 304, thus avoiding shaking.

[0035] In an optional embodiment, the reset element is a reset spring 305, one end of which is located inside the mounting plate 302, and the other end is located inside the receiving groove 304.3 on the brake plate 304. The receiving groove 304.3 and the inclined surface 304.2 are located on the same side.

[0036] In an optional embodiment, the second inclined surface 304.2 is provided with a contact protrusion, and the first inclined surface of the brake block 303 contacts the contact protrusion. The protrusion structure can increase the squeezing effect of the brake block 303 on the brake plate 304 and reduce the stroke of the brake block 303; at the same time, the contact protrusion creates a certain gap between the first inclined surface of the brake block 303 and the second inclined surface 304.2, so that the fourth gear 107 can drive the brake plate 304 to compress the second return spring 305 slightly, achieving more precise angle adjustment.

[0037] The precision rotary table also includes a housing 111 and a bottom cover 112 disposed at the bottom of the housing 111. The drive device, the transmission assembly, and the braking device 300 are all disposed within the housing 111. The bottom cover 112 is detachably mounted on the housing 111 to prevent foreign objects from entering the housing 111, ensuring the normal operation of each component, and facilitating the maintenance and repair of the transmission assembly, thus improving maintenance convenience. The housing 111 has a groove for accommodating the main shaft 110. The main shaft 110 is rotatably disposed within the groove via a roller bearing 108 and a needle roller bearing 109. A dustproof ring 113 is provided on the outer edge of the table surface. The dustproof ring 113 can prevent dust and debris from entering the interior of the housing 111, ensuring internal cleanliness and thus ensuring smooth transmission of the transmission assembly.

[0038] The precision control device 200 is mounted on the main shaft 110 and located below the gear 107. The precision control device 200 includes an expansion sleeve 201, a mounting sleeve 203, a piston 204, an oil inlet ring 205, and an oil inlet 211. The piston 204 is located inside the mounting sleeve 203. One end of the piston 204 is provided with the expansion sleeve 201 located inside the mounting sleeve 203, and the other end is provided with the oil inlet ring 205. An end cap 208 is mounted on the oil inlet ring 205. The expansion sleeve 201 and the piston 204... A return spring 202 is provided between the pistons 204. One end of the return spring 202 abuts against the expansion sleeve 201, and the other end abuts against the piston 204. The expansion sleeve 201 is sleeved on the main shaft 110. The expansion sleeve 201 has an outer inclined surface, and the piston 204 has an inner inclined surface. The inner inclined surface corresponds to the outer inclined surface. A cavity is provided between the oil inlet ring 205 and the piston 204. The side wall of the oil inlet ring 205 has an oil inlet 211 that communicates with the cavity.

[0039] The oil inlet ring 205 is rotatably mounted on the main shaft 110 via the bearing 206. A sealing ring 207 is provided between the piston 204 and the oil inlet ring 205. A sealing ring 210 is provided between the piston 204 and the mounting sleeve 203. A sealing ring 209 is provided between the oil inlet ring 205 and the mounting sleeve 203. By setting multiple sealing rings, the sealing performance of the cavity is ensured and oil leakage is avoided.

[0040] In an optional embodiment, the spindle 110, the drive device, and the transmission assembly are arranged in a triangular configuration. This maximizes space efficiency and reduces the floor space required while still meeting transmission needs.

[0041] In an optional embodiment, the transmission assembly includes a first synchronous pulley 102, a second synchronous pulley 103, a first gear 104, a second gear 105, and a third gear 106. The output end of the drive device is connected to the first synchronous pulley 102. The drive device is a servo motor 101. The first synchronous pulley 102 is connected to the second synchronous pulley 103 via a transmission belt. The second synchronous pulley 103 and the first gear 104 are coaxially mounted on a gear shaft 114. The gear shaft 114 is connected via... Bearing 116 is rotatably mounted on housing 111. Gear 104 is mounted on gear shaft 114 and meshes with gear 2 105. Gear 2 105 and gear 3 106 are coaxially rotatably mounted on fixed shaft 115 and connected to gear 3 106. Gear 3 106 meshes with gear 4 107. Fixed shaft 115 is parallel to gear shaft 114 to ensure that the power output from servo motor 101 is smoothly output to gear 4 107.

[0042] It should be noted that the servo motor 101 drives the synchronous pulley 102 to rotate, which in turn drives the synchronous pulley 103 and gear 104 to rotate via a synchronous belt. Gear 104 meshes with gear 2105, simultaneously driving gear 3106 to rotate. Gear 3106 meshes with gear 4107, driving gear 4107 and the main spindle 110 to rotate, thus realizing the rotation of the main spindle 110 and the table. The torque output by the servo motor 101 achieves a high reduction ratio after three transmissions: synchronous pulley 102 and synchronous pulley 103, gear 104 and gear 2105, gear 3106 and gear 4107. This significantly reduces the speed of the main spindle 110 and significantly increases its torque, ensuring the stability of the rotation of the main spindle 110 and the table. By adopting a multi-stage gear transmission structure, the gears do not require special materials, resulting in low manufacturing costs. Furthermore, no special lubrication methods are needed, simplifying maintenance and reducing repair costs.

[0043] The working process of this invention is as follows:

[0044] The control panel is connected to the controller, which is connected to the servo motor 101, the hydraulic station, and the air source. The hydraulic station is connected to the oil inlet 211. The rotation angle of the spindle 110 corresponds to the action time of the hydraulic station and the drive cylinder 301. The rotation angle of the spindle 110 is set on the control panel, and the controller calculates the rotation angle of the servo motor 101 based on the set angle and the transmission ratio of the transmission components.

[0045] For example, the specified rotation angle of the spindle 110 is 134.23°. An angle sensor is provided on one side of the spindle 110. When the spindle 110 rotates to 134°, the angle sensor transmits a signal to the controller. The controller controls the air source to supply compressed air to the drive cylinder 301. The drive cylinder 301 drives the brake block 303 to move along the guide key 309, so that the brake block 303 presses the brake plate 304. The brake plate 304 rotates around the support shaft 306 through the needle roller bearing 307. The brake plate 304 presses the return spring 305 to deform until the brake tooth 304.1 is engaged with the gear 107. The gear 107 has 360 teeth, so it can achieve braking accuracy to every degree.

[0046] Servo motor 101 continues to drive gear 4 107 and spindle 110 to rotate through transmission components. Gear 4 107 drives brake plate 304 to rotate and compresses return spring 2 305. When spindle 110 continues to rotate 0.23°, that is, spindle 110 rotates a total of 134.23°, servo motor 101 stops rotating. Angle sensor transmits signal to controller. Controller controls hydraulic oil from hydraulic station to enter inlet 211. Hydraulic oil reaches the cavity through inlet ring 205 and pushes piston 204 to move towards expansion sleeve 201. Inner inclined surface of piston 204 presses against outer inclined surface of expansion sleeve 201, causing expansion sleeve 201 to move radially and lock spindle 110. The movement of piston 204 is controlled by hydraulic oil, which improves controllability and ensures that sufficient pressure is generated to drive expansion sleeve 201 to lock spindle 110. The friction generated by expansion sleeve 201 locking spindle 110 eliminates the rotational inertia, thereby achieving more precise angle adjustment. By controlling the oil supply, spindle 110 is stopped at a specified position, improving the accuracy of braking position.

[0047] When the spindle 110 needs to resume rotation, the oil inlet 211 stops supplying oil, and the piston 204 moves in the opposite direction under the push of the return spring 202, causing the inner inclined surface of the piston 204 to separate from the outer inclined surface of the expansion sleeve 201. The expansion sleeve 201 restores its elastic deformation and releases the spindle 110. The drive cylinder 301 drives the brake block 303 to move in the opposite direction, causing it to separate from the brake plate 304. The return spring 305 drives the brake plate 304 to rotate in the opposite direction around the support shaft 306, causing the brake tooth 304.1 to separate from the gear 107. The servo motor 101 starts again, driving the gear 107, the spindle 110, and the table to rotate through the transmission assembly.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precision rotary table with multi-stage gear transmission, characterized in that, The system includes a drive unit, a transmission assembly, a main spindle (110), a precision control device (200), and a braking device (300). The drive unit is connected to the main spindle (110) via the transmission assembly. The main spindle (110) has a table. The transmission assembly includes a gear four (107), which is mounted on the main spindle (110). The precision control device (200) is used to lock the main spindle (110). The braking device (300) is used to brake the gear four (107). The braking device (300) brakes the main spindle (110) and the table at a specified angle. The precision control device achieves a turntable accuracy of 0.01 degrees. The braking device (300) includes a drive cylinder (301), a brake block (303), and a brake... The vehicle plate (304), support shaft (306), and reset component are provided. The output end of the drive cylinder (301) is connected to the brake block (303). The brake block (303) is provided with an inclined surface one. The support shaft (306) is located on one side of the gear four (107). The brake plate (304) is rotatably mounted on the support shaft (306). One side of the brake plate (304) is provided with an inclined surface two (304.2) corresponding to the inclined surface one. The inclined surface two (304.2) is provided with a contact protrusion. The inclined surface one contacts the contact protrusion. The other side of the brake plate (304) is provided with a brake tooth (304.1). The brake tooth (304.1) is used to engage with the gear four (107). The reset component is used to reset the brake plate (304).

2. The precision rotary table according to claim 1, characterized in that, It also includes a mounting plate (302) and a guide key (309), the guide key (309) being mounted on the mounting plate (302), and the brake block (303) being slidably connected to the guide key (309).

3. The precision rotary table according to claim 2, characterized in that, The reset component is a reset spring two (305). One end of the reset spring two (305) is located in the mounting plate (302), and the other end is located in the receiving groove (304.3) on the brake plate (304). The receiving groove (304.3) and the inclined surface two (304.2) are located on the same side.

4. The precision rotary table according to any one of claims 1 to 3, characterized in that, The precision control device (200) is mounted on the main shaft (110) and located below the gear four (107). The precision control device (200) includes an expansion sleeve (201), a mounting sleeve (203), a piston (204), an oil inlet ring (205), and an air inlet (211). The piston (204) is located inside the mounting sleeve (203). One end of the piston (204) is provided with an expansion sleeve (201) located inside the mounting sleeve (203), and the other end is provided with the oil inlet ring (205). A cavity is provided between the oil inlet ring (205) and the piston (204). The oil inlet ring (205) is provided with the air inlet (211) communicating with the cavity. The expansion sleeve (201) is sleeved on the main shaft (110). The expansion sleeve (201) is provided with an outer inclined surface, and the piston (204) is provided with an inner inclined surface. The inner inclined surface corresponds to the outer inclined surface.

5. The precision rotary table according to claim 4, characterized in that, It also includes a return spring (202), one end of which abuts against the expansion sleeve (201), and the other end abuts against the piston (204).

6. The precision rotary table according to claim 1, characterized in that, It also includes a housing (111) and a bottom cover (112) provided at the bottom of the housing (111). The drive device, the transmission assembly and the braking device (300) are all provided in the housing (111). The housing (111) is provided with a groove to accommodate the main shaft (110). The main shaft (110) is rotatably disposed in the groove. The outer edge of the table is provided with a dustproof ring (113).

7. The precision rotary table according to claim 1, characterized in that, The main shaft (110), the drive device, and the transmission assembly are arranged in a triangle.

8. The precision rotary table according to claim 1 or 7, characterized in that, The transmission assembly includes a first synchronous pulley (102), a second synchronous pulley (103), a first gear (104), a second gear (105), and a third gear (106). The output end of the drive device is connected to the first synchronous pulley (102). The first synchronous pulley (102) is connected to the second synchronous pulley (103) via a transmission belt. The second synchronous pulley (103) is coaxially arranged with the first gear (104). The first gear (104) meshes with the second gear (105). The second gear (105) is coaxially arranged with the third gear (106). The third gear (106) meshes with the fourth gear (107).

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