Planetary shafting transmission structure for single-sided grinding machine

Abstract

The application discloses a planetary shaft system transmission structure for a single-face grinding grinding machine, which comprises a revolution disc arranged on a base and driven by a central shaft driving transmission device, a workpiece disc one arranged on the revolution disc and driven by a first planetary driving transmission device, a workpiece disc two and a trimming disc simultaneously driven by a second planetary driving transmission device. The application adopts a servo motor to drive a worm gear and a worm structure for revolution disc rotation, and then drives the revolution disc through the central shaft, so that large-size and large-power transmission can be realized. The workpiece disc one, the trimming disc and the workpiece disc two are respectively driven by the respective driving transmission devices, so that the workpiece disc one and the trimming disc can work closer to the parts, the shorter transmission chain is adopted to realize power transmission, the transmission efficiency is improved, the number of parts is reduced, and the transmission structure is simplified.

Description

Technical Field

[0001] This invention pertains to grinding machine transmission devices, specifically relating to a planetary shaft transmission structure for a single-sided grinding machine. Background Technology

[0002] In traditional vertical rotary table planetary single-sided grinding machines, the drive devices for the rotary table, workpiece table, and dressing table are all located at the bottom of the machine tool. These are driven remotely by nested hollow shafts. Figure 8 , Figure 9 As shown, the central shaft C is the drive shaft of the revolution disk D. The drive shafts of the workpiece disk E and the dressing disk F are nested hollow shafts A and B, which are concentric with the drive shaft of the revolution disk D. This structure relies on a complex gear system to drive the unit remotely, resulting in a complex lower platen structure, high cost, low efficiency, large power loss, and high requirements for the machining accuracy of each transmission component. Summary of the Invention

[0003] The purpose of this invention is to provide a planetary shaft transmission structure for single-sided grinding machines that is simple in structure and can improve machining accuracy.

[0004] The technical solution adopted to achieve the purpose of this invention is as follows: The planetary shaft transmission structure for a single-sided grinding machine provided by the present invention includes a planetary disk on the base driven by a central shaft drive transmission device, a workpiece disk one on the planetary disk driven by a first planetary drive transmission device, a workpiece disk two and a dressing disk simultaneously driven by a second planetary drive transmission device.

[0005] The central shaft drive transmission device includes a central shaft driven by a servo motor through a worm gear mechanism, a central shaft end cover located at the upper end of the central shaft, and a top pressure cover fixed on the central shaft end cover. The planetary disk is fixed on the top pressure cover. The central shaft end cover and the top pressure cover are connected by a key and a keyway. When the central shaft rotates, the planetary disk is driven to rotate through the central shaft end cover and the top pressure cover.

[0006] The first planetary drive transmission device includes a harmonic reducer driven by a servo motor 2 via a synchronous belt mechanism 1, a spin shaft 1 connected to the harmonic reducer 1 via a cross keyway structure 1, and a turntable bearing 1 fixed on the planetary disk. The spin shaft 1 is installed inside the turntable bearing 1, and the workpiece disk 1 is fixed on the spin shaft 1.

[0007] The cross keyway structure includes a lower connecting plate connected to the output end of the harmonic reducer, an upper connecting plate connected to the rotating shaft, and a cross slide block with upper and lower grooves arranged at 90 degrees to each other on the upper and lower surfaces. The cross slide block engages with the horizontal key on the upper connecting plate and the horizontal key on the lower connecting plate through the upper and lower grooves, respectively.

[0008] The synchronous belt mechanism includes an active synchronous pulley connected to the output shaft of the servo motor, a passive synchronous pulley connected to the input shaft of the harmonic reducer, and a synchronous belt mounted on the active synchronous pulley and the passive synchronous pulley.

[0009] The second planetary drive transmission device includes a harmonic reducer II driven by a servo motor III via a synchronous belt mechanism II, mounted on the base; a spin shaft II connected to the harmonic reducer II via a cross-keyway structure II; and a turntable bearing II fixed on the revolution disk. The spin shaft II is installed inside the turntable bearing II, and the dressing disc is fixed to the spin shaft II via a pad. The cross-keyway structure II includes a lower connecting plate II connected to the output end of the harmonic reducer II, an upper connecting plate II connected to the spin shaft II, and upper and lower connecting plates. A second cross-shaped sliding key block is provided with upper and lower sliding grooves arranged at 90 degrees to each other. The second cross-shaped sliding key block is engaged with the horizontal key on the upper connecting plate 2 and the horizontal key on the lower connecting plate 2 through the upper and lower sliding grooves, respectively. The second planetary drive transmission device also includes a harmonic reducer 3 driven by the synchronous belt mechanism 2, a spin shaft 3 connected to the harmonic reducer 3 through the cross-shaped keyway structure 3, and a turntable bearing 3 fixed on the revolution disk. The spin shaft 3 is installed in the turntable bearing 3, and the workpiece disk 2 is fixed on the spin shaft 3.

[0010] The cross keyway structure includes a lower connecting plate three connected to the output end of the harmonic reducer three, an upper connecting plate three connected to the self-rotating shaft three, and a cross sliding key block three with upper and lower sliding grooves arranged at 90 degrees to each other on the upper and lower surfaces respectively. The cross sliding key block three cooperates with the horizontal key on the upper connecting plate three and the horizontal key on the lower connecting plate three through the upper and lower sliding grooves respectively.

[0011] The second synchronous belt mechanism includes a second active synchronous pulley connected to the output shaft of the third servo motor, a second passive synchronous pulley, a second synchronous belt mounted on the second active synchronous pulley and the second passive synchronous pulley, a third transition synchronous pulley fixed on the second passive synchronous pulley, a third passive synchronous pulley connected to the input shaft of the second harmonic reducer, and a third synchronous belt mounted on the third transition synchronous pulley and the third passive synchronous pulley. The third harmonic reducer is fixed on the third transition synchronous pulley.

[0012] Beneficial effects 1. This invention uses a servo motor to drive the worm gear and worm shaft structure to rotate the revolution disk, and then drives the revolution disk through the central shaft, which can realize large-size and high-power transmission. The workpiece disk one, the dressing disk and the workpiece disk two are driven by their respective drive transmission devices, which can do work closer to the parts, use a shorter transmission chain to realize power transmission, improve transmission efficiency, reduce the number of parts and simplify the transmission structure.

[0013] 2. A cross-keyway structure is adopted between the harmonic reducer and the workpiece disc and dressing disc. While transmitting power, it can reduce the impact of the drive unit on the machining accuracy and improve the machining accuracy of the machine tool.

[0014] The technical solution of the present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the device of the present invention.

[0016] Figure 2 yes Figure 1 Top view.

[0017] Figure 3 This is a schematic diagram of the central shaft drive transmission device in this invention.

[0018] Figure 4 This is a schematic diagram of the structure of the first planetary drive transmission device in this invention.

[0019] Figure 5 This is a schematic diagram of the cross keyway structure in this invention.

[0020] Figure 6 , Figure 7 These are partial structural schematic diagrams of the second planetary drive transmission device in this invention.

[0021] Figure 8 A schematic diagram of an existing planetary single-sided grinding machine.

[0022] Figure 9 yes Figure 8 Top view. Detailed Implementation

[0023] See Figure 1 , Figure 2 The planetary shaft transmission structure for a single-sided grinding machine provided by the present invention includes a planetary disk 4 driven by a central shaft drive transmission device 1, a workpiece disk 211 driven by a first planetary drive transmission device 2 and a workpiece disk 211′ and a dressing disk 314 driven by a second planetary drive transmission device 3 on the planetary disk 4.

[0024] See Figure 3The central shaft drive transmission device 1 includes a base 101, a central shaft 107 mounted on the base 101 and driven by a servo motor 102 via a worm gear mechanism, a central shaft end cover 109 mounted on the upper end of the central shaft 107, and a top cover 110 fixed on the central shaft end cover 109. The rotating disk 4 is fixed on the top cover 110. The worm gear mechanism includes a worm 103 and a worm wheel 104. The central shaft end cover 109 and the top cover 110 are connected by a key and a keyway. The rotating disk 4 is fixed to the top cover 110 by a threaded connection. When the central shaft 107 rotates, it drives the rotating disk 4 to rotate through the central shaft end cover 109 and the top cover 110.

[0025] See Figure 2 , Figure 4 , Figure 5 The first planetary drive transmission device 2 includes a harmonic reducer 205 driven by a servo motor 202 via a synchronous belt mechanism 2 and mounted on the base 101; a spin shaft 210 connected to the harmonic reducer 205 via a cross keyway structure 2; and a turntable bearing 209 fixed on the planetary disk 4. The spin shaft 210 is installed inside the turntable bearing 209, and the workpiece disk 211 is fixed on the spin shaft 210. The synchronous belt mechanism 2 includes a driving synchronous pulley 201 connected to the output shaft of the servo motor 202; a driven synchronous pulley 204 connected to the input shaft of the harmonic reducer 205; and a drive synchronous pulley 204 mounted on the main planetary drive transmission device 4. The synchronous belt 203 is on the driving synchronous pulley 201 and the driven synchronous pulley 204; the cross keyway structure includes a lower connecting plate 206 connected to the output end of the harmonic reducer 205, an upper connecting plate 208 connected to the rotation shaft 210, and a cross sliding key block 207 with upper and lower sliding grooves arranged at 90 degrees to each other on the upper and lower surfaces, respectively. The cross sliding key block 207 is engaged with the horizontal key on the upper connecting plate 208 and the horizontal key on the lower connecting plate 206 through the upper and lower sliding grooves, respectively; during operation, the servo motor 202 drives the workpiece disk 211 to rotate through the harmonic reducer 205 and the rotation shaft 210.

[0026] See Figure 6 , Figure 7The second planetary drive transmission device 3 includes a harmonic reducer 308 driven by a servo motor 301 via a synchronous belt mechanism 2 and mounted on the base 101; a spin shaft 312 connected to the harmonic reducer 308 via a cross keyway structure 2; a pad 313 connected to the spin shaft 312; and a turntable bearing 316 fixed on the planetary disk 4. The spin shaft 312 is installed inside the turntable bearing 316, and the dressing disc 314 is fixed to the spin shaft 312 via the pad 313. Above, the dressing disc 314 is used to install the oilstone 315; the second synchronous belt mechanism includes a second active synchronous pulley 302, a second passive synchronous pulley 304, a second synchronous belt 303 disposed on the second active synchronous pulley 302 and the second passive synchronous pulley 304, a third transition synchronous pulley 305 fixed on the second passive synchronous pulley 304, a third passive synchronous pulley 307, and a third synchronous belt 306 disposed on the third transition synchronous pulley 305 and the third passive synchronous pulley 307; the second cross keyway structure is the same as the first cross keyway structure (see Figure 5The second planetary drive transmission device 3 includes a lower connecting plate 309 connected to the output end of the harmonic reducer 308, an upper connecting plate 311 connected to the spin shaft 312, and a cross key block 310 with upper and lower grooves arranged at 90 degrees to each other on the upper and lower surfaces, respectively. The cross key block 310 is engaged with the horizontal key on the upper connecting plate 311 and the horizontal key on the lower connecting plate 309 through the upper and lower grooves, respectively. The second planetary drive transmission device 3 also includes a harmonic reducer 405 driven by the synchronous belt mechanism 2, a spin shaft 410 connected to the harmonic reducer 405 through a cross keyway structure 3, and a turntable bearing 409 fixed on the planetary disk 4. The spin shaft 410 is installed in the turntable bearing 409, and the workpiece disk 211' is fixed on the spin shaft 410. The cross keyway structure 3 includes a lower connecting plate connected to the output end of the harmonic reducer 405. The third component 406 comprises an upper connecting plate 408 connected to the self-rotating shaft 410 and a cross-shaped sliding key block 407 with upper and lower sliding grooves arranged at 90 degrees to each other on its upper and lower surfaces. The cross-shaped sliding key block 407 engages with the horizontal key on the upper connecting plate 408 and the horizontal key on the lower connecting plate 406 through the upper and lower sliding grooves, respectively. The second synchronous belt mechanism includes an active synchronous pulley 302 connected to the output shaft of the servo motor 301, a passive synchronous pulley 304, a synchronous belt 303 disposed on the active synchronous pulley 302 and the passive synchronous pulley 304, a transition synchronous pulley 305 fixed on the passive synchronous pulley 304, a passive synchronous pulley 307 connected to the input shaft of the harmonic reducer 308, and a synchronous belt 306 disposed on the transition synchronous pulley 305 and the passive synchronous pulley 307. The harmonic reducer 305 is fixed on the transition synchronous pulley 305. During operation, the servo motor 301 and the active synchronous pulley 302 drive the passive synchronous pulley 304 via the synchronous belt 303. The passive synchronous pulley 304 drives the passive synchronous pulley 307 and the harmonic reducer 308 via the connected transition synchronous pulley 305 and synchronous belt 306. The harmonic reducer 308 drives the dressing disc 314 and the oilstone 315 to rotate via the spin shaft 312 and the pad 313. The upper surface of the oilstone 315 grinds against the lower surface of the grinding wheel during rotation, which can achieve the function of dressing and sharpening the grinding wheel, improving the flatness of the grinding wheel surface and the sharpness of the dressing particles. The servo motor 301 simultaneously drives the harmonic reducer 405, the spin shaft 410, and the workpiece disc 211' to rotate via the passive synchronous pulley 304.

[0027] The harmonic reducer 1 (205), harmonic reducer 2 (308), and harmonic reducer 3 (405) can achieve a large reduction ratio and a large torque output within a unit volume.

[0028] See Figure 5 The cross keyway structure one, cross keyway structure two, and cross keyway structure three described in this invention have the same structure. They all adopt a cross sliding key block with upper and lower sliding grooves arranged at 90 degrees to each other on the upper and lower surfaces. When the cross sliding key block is connected to the horizontal key on the upper and lower connecting plates fixed to the upper and lower transmission shafts through the upper and lower sliding grooves, the two vertical degrees of freedom can be released. This solves the problem of high coaxiality requirements when using transmission shaft connection in the original technology. This structure can ensure that even if there is a large difference in coaxiality between the output shaft of the reducer and the rotation shaft (the maximum difference in coaxiality can be tens of millimeters), it will still transmit power without applying radial force to the rotation shaft, and maintain the high precision of the rotation shaft.

[0029] This invention employs a dynamic grinding method. The first planetary drive transmission device 2 driving the workpiece disk 211 and the second planetary drive transmission device 3 driving the dressing disk 314 and workpiece disk 211′ are respectively driven by their respective servo motors 202 and 301. While rotating on their own axis, the workpiece disk 211, workpiece disk 211′ and dressing disk 314 revolve around the geometric axis of the revolution disk 4. During the grinding process, when it is necessary to dress the grinding wheel, the second planetary drive transmission device 3 can be controlled by PLC to automatically realize the grinding wheel dressing function, which greatly improves the grinding efficiency.

[0030] The present invention fixes the workpiece by vacuum adsorption, making full use of the hollow space of the central shaft 107 to arrange the air path reasonably. The pneumatic slip ring 106 is installed in the internal space of the central shaft 107. The pneumatic slip ring 106 is fixed to the base 101 by the slip ring mounting rod 105. One end of the slip ring connecting sleeve 108 is connected to the rotating flange surface of the pneumatic slip ring 106, and the other end is connected to the central shaft end cover 109, which drives the circuit of the vacuum pipeline and the servo motor to rotate with the revolution disk 4.

Claims

1. A planetary shafting transmission structure for a single-sided grinding machine, characterized in that It includes a planetary disk on the base driven by a central shaft drive transmission device, a workpiece disk one on the planetary disk driven by a first planetary drive transmission device, and a workpiece disk two and a dressing disk driven by a second planetary drive transmission device. The central shaft drive transmission device includes a central shaft driven by a servo motor through a worm gear mechanism, a central shaft end cover located at the upper end of the central shaft, and a top cover fixed on the central shaft end cover. The rotary disk is fixed on the top cover. The central shaft end cover and the top cover are connected by a key and a keyway. When the central shaft rotates, the rotary disk is driven to rotate through the central shaft end cover and the top cover. The first planetary drive transmission device includes a harmonic reducer driven by a servo motor 2 via a synchronous belt mechanism 1 and mounted on the base, a spin shaft 1 connected to the harmonic reducer 1 via a cross keyway structure 1, and a turntable bearing 1 fixed on the revolution disk. The spin shaft 1 is installed inside the turntable bearing 1, and the workpiece disk 1 is fixed on the spin shaft 1. The cross keyway structure includes a lower connecting plate connected to the output end of the harmonic reducer, an upper connecting plate connected to the rotating shaft, and a cross sliding key block with upper and lower sliding grooves arranged at 90 degrees to each other on the upper and lower surfaces, respectively. The cross sliding key block cooperates with the horizontal key on the upper connecting plate and the horizontal key on the lower connecting plate through the upper and lower sliding grooves. The synchronous belt mechanism includes an active synchronous pulley connected to the output shaft of the servo motor, a passive synchronous pulley connected to the input shaft of the harmonic reducer, and a synchronous belt disposed on the active synchronous pulley and the passive synchronous pulley. The second planetary drive transmission device includes a harmonic reducer II driven by a servo motor III via a synchronous belt mechanism II, mounted on the base; a spin shaft II connected to the harmonic reducer II via a cross-keyway structure II; and a turntable bearing II fixed on the revolution disk. The spin shaft II is installed inside the turntable bearing II, and the dressing disc is fixed to the spin shaft II via a pad. The cross-keyway structure II includes a lower connecting plate II connected to the output end of the harmonic reducer II, an upper connecting plate II connected to the spin shaft II, and upper and lower connecting plates respectively. The second planetary drive transmission device includes a cross slide block 2 with upper and lower slide grooves arranged at 90 degrees to each other. The cross slide block 2 is engaged with the horizontal key on the upper connecting plate 2 and the horizontal key on the lower connecting plate 2 through the upper and lower slide grooves respectively. The second planetary drive transmission device also includes a harmonic reducer 3 driven by the synchronous belt mechanism 2, a spin shaft 3 connected to the harmonic reducer 3 through the cross slide structure 3, and a turntable bearing 3 fixed on the revolution disk. The spin shaft 3 is installed in the turntable bearing 3, and the workpiece disk 2 is fixed on the spin shaft 3. The cross keyway structure includes a lower connecting plate three connected to the output end of the harmonic reducer three, an upper connecting plate three connected to the self-rotating shaft three, and a cross sliding key block three with upper and lower sliding grooves arranged at 90 degrees to each other on the upper and lower surfaces respectively. The cross sliding key block three cooperates with the horizontal key on the upper connecting plate three and the horizontal key on the lower connecting plate three through the upper and lower sliding grooves respectively.

2. The planetary shaft transmission structure for a single-sided grinding machine according to claim 1, characterized in that: The second synchronous belt mechanism includes a second active synchronous pulley connected to the output shaft of the third servo motor, a second passive synchronous pulley, a second synchronous belt mounted on the second active synchronous pulley and the second passive synchronous pulley, a third transition synchronous pulley fixed on the second passive synchronous pulley, a third passive synchronous pulley connected to the input shaft of the second harmonic reducer, and a third synchronous belt mounted on the third transition synchronous pulley and the third passive synchronous pulley. The third harmonic reducer is fixed on the third transition synchronous pulley.

Images