Machine tool rotary table driving device and vertical turning and milling composite machine tool

Abstract

The utility model discloses a machine tool rotary table driving device and a vertical turning and milling composite machine tool, and relates to the technical field of rotary table driving devices.The machine tool rotary table driving device comprises a power conversion box, the power conversion box comprises a box body, and a main power input shaft, a first middle shaft, an indexing adjustment power input shaft, a second middle shaft and a power output shaft are rotationally installed in the box body; the main power input shaft and the middle shaft II are rotationally mounted and are coaxially arranged; a power conversion mechanism is arranged on the middle shaft I; the power conversion mechanism is selectively in transmission connection with the main power input shaft or the indexing adjustment power input shaft; a second shaft transmission mechanism is arranged on the second middle shaft, and the second middle shaft is in transmission connection with the power output shaft through a second gear set. Therefore, through the arrangement of the power conversion box, rapid switching between main power and indexing adjustment power is achieved, the response time is shortened, and the working efficiency of the machine tool is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of rotary table drive devices, specifically to a machine tool rotary table drive device and a vertical turning and milling composite machine tool. Background Technology

[0002] Milling-turning composite machine tools represent the current development trend of CNC machine tools and are one of the most popular machining processes in the field of mechanical processing. Generally, milling-turning composite machine tools combine turning, milling, and boring functions into one machine tool to improve the machining efficiency of complex workpieces. The milling-turning composite rotary table is a key component of milling-turning composite machine tools.

[0003] In machining, turning and milling have different requirements for the rotational speed of the rotary table. Turning requires a particularly high rotational speed (from zero to several hundred revolutions per minute), so a high-power (tens to hundreds of kilowatts) DC motor or AC asynchronous frequency converter motor is generally required as the drive motor for the vertical lathe rotary table, equipped with a multi-stage gearbox to meet the technical requirements of the turning process. In milling, the milling spindle rotates at high speed to drive the cutting tool to mill the workpiece, and the rotary table is only used to adjust the indexing, with a lower speed requirement (such as a few tenths of a revolution), but a higher requirement for indexing accuracy. Therefore, a permanent magnet servo motor (i.e., a small indexing motor) is generally required.

[0004] To ensure that the main drive motor and the small indexing motor operate independently, current vertical lathe-type milling and turning composite CNC machine tools employ a traditional vertical lathe rotary table drive structure combined with the indexing function of the C-axis rotary table. This means a DC motor or AC asynchronous frequency converter drives the large gear ring on the vertical lathe worktable via a multi-stage gearbox, rotating the worktable to achieve high-speed, high-efficiency turning. The milling rotary indexing function is achieved by adding a C-axis transmission device, where a hydraulic cylinder pushes the small gear of the C-axis drive to mesh with the large gear ring on the worktable, realizing milling operations.

[0005] The milling rotary indexing function adds a C-axis transmission device, which uses a hydraulic cylinder to drive the small gear of the C-axis to mesh with the large gear ring of the worktable. A small indexing motor adjusts the indexing of the turntable to achieve indexing and milling.

[0006] When switching to turning function, it is essential to ensure that the C-axis drive pinion is disengaged from the large gear ring of the worktable before the vertical lathe rotary table drive mechanism can operate. Otherwise, the C-axis drive will be damaged, potentially causing a machine tool accident.

[0007] The control process for the above-mentioned mill-turn conversion can be referred to the patent document entitled "A CNC Vertical Mill-Turn Composite Machining Center Worktable" with patent application publication number CN109571051A, which contains a more detailed description.

[0008] Because the engagement or disengagement of the C-axis drive must be controlled, the transition between turning and milling is generally done after the turntable has come to a complete stop, which results in a longer response time and affects machining efficiency. The C-axis drive is also generally a gear set, which is equivalent to adding an extra hydraulic system and a gearbox, increasing costs and affecting transmission accuracy. Utility Model Content

[0009] To overcome the above-mentioned defects, the purpose of this utility model is to provide a machine tool rotary table drive device and a vertical turning and milling compound machine tool. By setting up a power conversion box, it can realize the rapid switching between the main power and the indexing adjustment power, reduce the response time, and improve the working efficiency of the machine tool.

[0010] To achieve the above objectives, this utility model provides a machine tool rotary table drive device, comprising: a power conversion box, the power conversion box including a housing, within which a main power input shaft, an intermediate shaft, an indexing adjustment power input shaft, an intermediate second shaft, and a power output shaft are rotatably mounted; the main power input shaft and the intermediate second shaft are rotatably mounted and coaxially arranged; a power conversion mechanism is provided on the intermediate shaft; the power conversion mechanism is selectively connected to either the main power input shaft or the indexing adjustment power input shaft; a two-axis transmission mechanism is provided on the intermediate second shaft, wherein when the main power input shaft is connected to the power conversion mechanism, the intermediate second shaft is selectively connected to either the main power input shaft or the intermediate shaft through the two-axis transmission mechanism; when the indexing adjustment power input shaft is connected to the power conversion mechanism, the intermediate shaft and the intermediate second shaft are connected through the two-axis transmission mechanism, and the intermediate second shaft and the power output shaft are connected through a second gear set.

[0011] Preferably, the power conversion mechanism includes a first power conversion gear, which is slidably connected to the intermediate shaft. The main power input shaft is provided with a main power input gear, and the indexing adjustment power input shaft is provided with an indexing adjustment power input gear. The power conversion gear can selectively mesh with either the main power input gear or the indexing adjustment power input gear.

[0012] Preferably, the power conversion mechanism includes a second power conversion gear and a worm gear mechanism. The worm wheel of the worm gear mechanism is disposed on the intermediate shaft, and the worm of the worm gear mechanism is disposed on the indexing adjustment power input shaft. The second power conversion gear can selectively engage with or disengage from the end face of the worm wheel.

[0013] Preferably, the two-axis transmission mechanism includes two-axis transmission gears, which are slidably and keyedly connected to the intermediate two shafts. A small gear is provided on the intermediate one shaft. When the main power input shaft is connected to the power conversion mechanism, the intermediate two shafts are connected to the main power input shaft via the two-axis transmission gears or via the two-axis transmission gears and the small gear on the intermediate one shaft. When the indexing adjustment power input shaft is connected to the power conversion mechanism, the intermediate one shaft is connected to the intermediate two shafts via the two-axis transmission gears and the small gear on the intermediate one shaft.

[0014] Preferably, the second gear set includes a double sliding gear disposed on the intermediate two shafts and a first power output gear and a second power output gear disposed on the power output shaft, wherein the double sliding gear may selectively mesh with the first power output gear or the second power output gear.

[0015] Preferably, the main power input shaft is driven to the motor shaft of the main motor, and the indexing adjustment power input shaft is driven to the motor shaft of the indexing motor.

[0016] Preferably, the main motor is fixed to the housing, and the indexing motor is fixed to the housing.

[0017] As a general inventive concept, this utility model also provides a vertical turning and milling compound machine tool, wherein the machine tool turntable drive device is located on the inner side, outer side or bottom of the turntable of the vertical turning and milling compound machine tool, and the power output shaft is connected to the turntable of the vertical turning and milling compound machine tool for transmission.

[0018] Preferably, the machine tool rotary table drive device is one or two sets, and the power output shafts of both sets of the machine tool rotary table drive device are connected to the rotary table drive.

[0019] The beneficial technical effects achieved by this utility model after adopting the above technical solution are as follows:

[0020] 1. By connecting the output shafts of the main motor and the indexing motor to a single power conversion box, and by installing multiple drive shafts and gears within the box, the position of the power conversion gears can be adjusted to selectively connect with either the main power input shaft or the indexing adjustment power input shaft. The main motor provides significant rotational power, enabling the turntable to rotate at high speed for turning operations. When the power conversion gear meshes with the indexing adjustment power input gear of the indexing motor, power conversion is complete. At this point, the indexing motor provides the power for indexing adjustment to the turntable. The intermediate shaft 1 and intermediate shaft 2, along with the second gear set on the power output shaft, achieve speed ratio conversion. Throughout this process, the main motor and the indexing motor share a single speed ratio conversion device, eliminating the need for an additional C-axis transmission device. This reduces manufacturing and installation costs. Furthermore, during operation, it is not necessary to disengage the turntable's drive gear to switch power, resulting in faster response, higher efficiency, and reduced maintenance costs for the entire power conversion box.

[0021] 2. By sharing a single power conversion box with the output shafts of the main motor and the indexing motor, not only can power switching be achieved, but also deceleration and gear shifting can be realized. This is equivalent to improving the original gearbox. The entire drive unit is smaller in size. During installation, the entire rotary table drive unit can be placed on the inner, outer, or bottom surface of the rotary table, depending on the installation position. This versatility in installation makes it suitable for different working conditions. In particular, for some multi-axis linkage composite models, the reduced size allows for the installation of more auxiliary equipment, expanding the application range of the machine tool. Attached Figure Description

[0022] Figure 1 This is a schematic diagram showing the usage state of this utility model;

[0023] Figure 2 This is a reference schematic diagram of the main motor in the working state of this utility model;

[0024] Figure 3 This is a reference schematic diagram of the indexing motor of this utility model in the working state;

[0025] Figure 4 This is a reference schematic diagram of the main motor directly connected to the intermediate two shafts in this utility model;

[0026] Figure 5 Yes, this utility model uses a worm gear as the power source for the middle shaft, as shown in the reference diagram.

[0027] Figure 6 This is a reference schematic diagram of the power output shaft of this utility model using a simplified gearbox;

[0028] In the diagram,

[0029] 1. Power conversion box;

[0030] 11. Box body;

[0031] 12. Main power input shaft; 121. Main power input gear;

[0032] 13. Intermediate shaft; 131. First power conversion gear; 132. Small gear on intermediate shaft; 133. Second power conversion gear; 134. Worm gear; 135. Worm;

[0033] 14. Indexing adjustment of the power input shaft; 141. Indexing adjustment of the power input gear;

[0034] 15. Intermediate second shaft; 151. Second shaft transmission gear; 152. Double sliding gear;

[0035] 16. Power output shaft; 161. First power output gear; 162. Second power output gear;

[0036] 2. Main motor;

[0037] 3. Indexing motor;

[0038] 4. Turntable. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0040] See Figure 1 This utility model provides a machine tool rotary table drive device, including: a power conversion box 1, which includes a housing 11. A main power input shaft 12, an intermediate shaft 13, an indexing adjustment power input shaft 14, an intermediate second shaft 15, and a power output shaft 16 are rotatably mounted inside the housing 11. The main power input shaft 12 and the intermediate second shaft 15 are rotatably mounted and coaxially arranged. A power conversion mechanism is provided on the intermediate shaft 13. The power conversion mechanism can be selectively connected to either the main power input shaft 12 or the indexing adjustment power input shaft 14. During installation, the main power input shaft 12 is inserted into and rotatably mounted on the intermediate second shaft 15, and the two are coaxial. The two-axis transmission gear 151 on the intermediate second shaft 15 is slidable. When it slides to the main power input shaft 12 (see...), Figure 4 The power of the main motor 2 can be directly transmitted to the intermediate second shaft 15 without deceleration.

[0041] A two-axis transmission mechanism is provided on the intermediate second shaft 15. When the main power input shaft 12 is connected to the power conversion mechanism, the intermediate second shaft 15 can be selectively connected to either the main power input shaft 12 or the intermediate first shaft 13 through the two-axis transmission mechanism. When the indexing adjustment power input shaft 14 is connected to the power conversion mechanism, the intermediate first shaft 13 and the intermediate second shaft 15 are connected through the two-axis transmission mechanism, and the intermediate second shaft 15 is connected to the power output shaft 16 through a second gear set. This utility model provides two types of power conversion mechanisms: gear transmission and worm gear transmission. Both are essentially the same, transmitting the power of the main motor 2 or the indexing motor 3 to the power output shaft 16.

[0042] The power conversion mechanism of this utility model includes a first power conversion gear 131, which is slidably connected to an intermediate shaft 13. A main power input shaft 12 is provided with a main power input gear 121, and an indexing adjustment power input shaft 14 is provided with an indexing adjustment power input gear 141. The power conversion gear can selectively mesh with either the main power input gear 121 or the indexing adjustment power input gear 141. The power output shaft 16 has two power sources. When the first power conversion gear 131 meshes with the indexing adjustment power input gear 141 of the indexing motor 3, the rotational power of the turntable 4 comes from the indexing motor 3. The indexing motor 3 (a permanent magnet servo motor) is relatively small in size and has low power, generally suitable for precise indexing adjustment or low-speed rotation, and is suitable for milling, boring, and other processes. The first power conversion gear 131 is slidable, and power switching is generally achieved through a shift fork (not shown in the figure). The technology of using a shift fork to move the gear to achieve power switching is a mature existing technology and has extremely wide applications in vehicle transmissions. See also Figure 2 and Figure 3 .

[0043] See Figure 5 The power conversion mechanism of this utility model includes a second power conversion gear 133 and a worm gear mechanism. The worm gear 134 of the worm gear mechanism is mounted on the intermediate shaft 13, and the worm 135 of the worm gear mechanism is mounted on the indexing adjustment power input shaft 14. The second power conversion gear 133 can selectively engage with or disengage from the end face of the worm gear 134. The second power conversion gear 133 has the same function as the first power conversion gear 131. Figure 5 The dotted line represents the indexing motor 3. A gear plate can be mounted on the opposing surface between the worm gear 134 and the second power conversion gear 133. Power transmission is achieved through the meshing end face of the gear plate. After the second power conversion gear 133 slides a certain distance via the shift fork, the meshing transmission between the two meshing surfaces can be achieved. Gear meshing transmission is the most stable and efficient transmission method. In this utility model, gear transmission is preferred for power transmission.

[0044] Taking the main power transmission provided by the main motor 2 as an example, the power transmission sequence is as follows: main power input shaft 12, first power conversion gear 131, intermediate shaft 13, intermediate shaft 13 pinion 132, intermediate shaft 15 large gear, intermediate shaft 15, and then through the speed switching of the double sliding gear 152 with the first power output gear 161 and the second power output gear 162, the power is finally transmitted from the power output shaft 16 to the turntable 4. The double sliding gear 152 generally consists of two gears, realizing two-stage power transmission. For machine tools with a single function, single-stage power transmission can also be used. See [link to documentation]. Figure 6 In this diagram, the power conversion method is the same, and there is only one pair of gears between the intermediate shaft 15 and the power output shaft 16.

[0045] The two-axis transmission mechanism of this utility model includes a two-axis transmission gear 151, which is slidably and keyedly connected to the intermediate two-axis 15. An intermediate one-axis pinion 132 is provided on the intermediate one-axis 13. When the main force input shaft 12 is connected to the power conversion mechanism, the intermediate two-axis 15 is connected to the main force input shaft 12 through the two-axis transmission gear 151 or through the two-axis transmission gear 151 and the intermediate one-axis pinion 132. When the indexing adjustment power input shaft 14 is connected to the power conversion mechanism, the intermediate one-axis 13 and the intermediate two-axis 15 are connected through the two-axis transmission gear 151 and the intermediate one-axis pinion 132.

[0046] The second gear set of this utility model includes a double sliding gear 152 disposed on the intermediate second shaft 15 and a first power output gear 161 and a second power output gear 162 disposed on the power output shaft 16. The double sliding gear 152 can selectively mesh with the first power output gear 161 or the second power output gear 162. When the intermediate shaft pinion 132 and the first power conversion gear 131 engage, a first-stage reduction is achieved. Then, after the speed ratio is adjusted by the second shaft transmission gear 151 on the intermediate second shaft 15, the double sliding gear 152, and the first power output gear 161 and the second power output gear 162 on the power output shaft 16, the appropriate power is transmitted to the power output shaft 16. In the above process, the double sliding gear 152 on the intermediate second shaft 15 and the first power output gear 161 and the second power output gear 162 on the power output shaft 16 can selectively mesh with either the first power output gear 161 or the second power output gear 162. The multiple gears on the intermediate shaft 13, the intermediate second shaft 15, and the power output shaft 16 together form a gearbox, which can achieve different speed outputs. A shifting mechanism (not shown in the figure) is also installed. After the speed is changed, the power output shaft 16 drives the turntable 4 to rotate through the bevel gear. The adjustment and conversion of the output speed are mature existing technologies.

[0047] The main power input shaft 12 of this invention is connected to the motor shaft of the main motor 2, and the indexing adjustment power input shaft 14 is connected to the motor shaft of the indexing motor 3. Various transmission connection methods are available, including but not limited to couplings, reducers, and synchronous belts.

[0048] The main motor 2 and the indexing motor 3 of this invention are fixed to the housing 11. As needed, a suitable model is selected and installed on the housing 11, along with other auxiliary components, to achieve the transmission connection.

[0049] The power output shaft 16 of this invention is connected to the rotary table 4 of a vertical turning-milling composite machine tool. The rotary table 4 of the vertical turning-milling composite machine tool is relatively large. The power conversion box 1, main motor 2, and indexing motor 3 of this invention can all be located outside the rotary table 4, or they can all be located inside the rotary table 4. When located inside or at the bottom (not shown in the figure), the installation process is relatively complex, mainly to reduce the size and facilitate adjustment of the tilt angle of the rotary table 4. Setting it outside is the most common installation method. The machine tool rotary table drive device can be one or two sets. If two sets are used, the power output shaft 16 of both sets of the turning-milling composite machine tool rotary table drive device is connected to the rotary table 4. In actual use, generally two sets of power conversion boxes 1 are used, as shown in the bevel gear pair on the right side of the figure. An additional set can also be installed. In this way, the two sets of power conversion boxes 1 are connected to one rotary table 4, enabling the rotary table 4 of this vertical turning-milling composite machine tool to achieve backlash elimination, improve working stability, and maintain machining accuracy. If a set is used, it can generally be used with a gap elimination box to achieve the gap elimination function. The installation and maintenance costs can be significantly reduced. You can choose according to the actual needs. The gap elimination box is an existing technology.

[0050] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A machine tool rotary table drive device, characterized in that, include: A power conversion box includes a housing, within which a main power input shaft, an intermediate shaft, an indexing adjustment power input shaft, an intermediate shaft, and a power output shaft are rotatably mounted; the main power input shaft and the intermediate shaft are rotatably mounted and coaxially arranged; a power conversion mechanism is provided on the intermediate shaft; The power conversion mechanism can be selectively connected to the main power input shaft or the indexing adjustment power input shaft; a two-shaft transmission mechanism is provided on the intermediate two shafts. When the main power input shaft is connected to the power conversion mechanism, the intermediate two shafts can be selectively connected to the main power input shaft or the intermediate one shaft through the two-shaft transmission mechanism; when the indexing adjustment power input shaft is connected to the power conversion mechanism, the intermediate one shaft and the intermediate two shafts are connected through the two-shaft transmission mechanism, and the intermediate two shafts are connected to the power output shaft through a second gear set.

2. The machine tool rotary table drive device according to claim 1, characterized in that, The power conversion mechanism includes a first power conversion gear, which is slidably connected to the intermediate shaft. The main power input shaft is provided with a main power input gear, and the indexing adjustment power input shaft is provided with an indexing adjustment power input gear. The power conversion gear can selectively mesh with either the main power input gear or the indexing adjustment power input gear.

3. The machine tool rotary table drive device according to claim 1, characterized in that, The power conversion mechanism includes a second power conversion gear and a worm gear mechanism. The worm wheel of the worm gear mechanism is disposed on the intermediate shaft, and the worm of the worm gear mechanism is disposed on the indexing adjustment power input shaft. The second power conversion gear can selectively engage with or disengage from the end face of the worm wheel.

4. The machine tool rotary table drive device according to claim 1, characterized in that, The two-axis transmission mechanism includes two-axis transmission gears, which are slidably and keyedly connected to the two intermediate shafts. A small gear is provided on the first intermediate shaft. When the main power input shaft is connected to the power conversion mechanism, the two intermediate shafts are connected to the main power input shaft via the two-axis transmission gears or via the two-axis transmission gears and the small gear on the first intermediate shaft. When the indexing adjustment power input shaft is connected to the power conversion mechanism, the first intermediate shaft is connected to the two intermediate shafts via the two-axis transmission gears and the small gear on the first intermediate shaft.

5. The machine tool rotary table drive device according to claim 1, characterized in that, The second gear set includes a double sliding gear disposed on the intermediate two shafts and a first power output gear and a second power output gear disposed on the power output shaft. The double sliding gear can selectively mesh with either the first power output gear or the second power output gear.

6. The machine tool rotary table drive device according to claim 1, characterized in that, The main power input shaft is connected to the motor shaft of the main motor, and the indexing adjustment power input shaft is connected to the motor shaft of the indexing motor.

7. The machine tool rotary table drive device according to claim 6, characterized in that, The main motor is fixed to the housing, and the indexing motor is fixed to the housing.

8. A vertical turning and milling compound machine tool, characterized in that, The machine tool rotary table drive device according to any one of claims 1 to 7 is located on the inner side, outer side or bottom of the rotary table of the vertical turning and milling composite machine tool, and the power output shaft is connected to the rotary table of the vertical turning and milling composite machine tool via a transmission.

9. The vertical turning and milling composite machine tool according to claim 8, characterized in that, The machine tool rotary table drive device is one or two sets.

Images