Turntable double-gear anti-backlash device

Abstract

The utility model discloses a turntable double gear clearance elimination device, including box body, first gear, second gear, clearance elimination mechanism and transmission mechanism, first gear is provided at the top surface left side of box bottom, second gear is located second hole, clearance elimination mechanism includes slave pulley, master pulley, transmission belt and belt adjustment part, the transmission belt is located in the transmission mechanism. The transmission mechanism comprises a gearbox and a driving motor; according to the utility model, the anti-backlash mechanism is arranged in the rotary table, the gear transmission anti-backlash is realized by a gear single motor through belt tensioning in the transmission process, and the backlash between the double gears and the gear ring does not need to be manually adjusted and eliminated, so that the abrasion of mechanical parts is effectively reduced, and the machining precision of workpieces is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of turntable parts, and particularly relates to a turntable double-gear backlash elimination device. Background Technique

[0002] Gear transmission is one of the most common mechanical transmissions in the transmission system of a rotating turntable. It is a main form of transmitting power and motion and is an important component of the turntable transmission system. Compared with belt and chain drives, it has a series of characteristics such as a large power range, high transmission efficiency, high circumferential speed, accurate transmission ratio, long service life, and small structural size. Therefore, gear transmission is widely used in the transmission system of turntables.

[0003] However, since a certain amount of heat will be generated during the meshing motion of gear transmission, in order to prevent the gears from jamming due to thermal expansion during transmission, there is a certain backlash value between the tooth surfaces, and at the same time, a certain space is reserved for lubrication. This gap is very small. In the application of the general ordinary turntable feed system, due to its low positioning accuracy, it can fully meet the use requirements. However, for a numerical control turntable, due to its high positioning accuracy and repeated positioning accuracy, the backlash value of the gears in the transmission system will cause a certain gap value during the movement of the numerical control turntable in the opposite direction, which will affect the overall positioning accuracy of the numerical control turntable. Therefore, in the transmission system of the numerical control turntable, this gap value must be eliminated. Summary of the Invention

[0004] To solve the above problems, the utility model provides a turntable double-gear backlash elimination device with low manufacturing cost and can effectively eliminate the gear transmission gap.

[0005] To achieve the above object, the utility model adopts the following scheme: A turntable double-gear backlash elimination device includes a box body, a first gear, a second gear, a backlash elimination mechanism, and a transmission mechanism. A first hole is opened on the left side of the top surface of the box body, and an outwardly protruding installation groove is provided at the bottom of the box body opposite to the first hole below. A second hole identical to the first hole is opened on the right side of the top surface of the box body, and an input shaft hole is opened on the bottom surface of the box body opposite to the second hole.

[0006] The first gear is arranged on the left side of the top surface of the box bottom and is located above the first hole. A first direct-coupling spline shaft is provided at the bottom of it. The upper spline of the first direct-coupling spline shaft is connected to the central shaft hole of the first gear. Its upper part is connected to the top surface of the box body through a bearing. The remaining part of the first direct-coupling spline shaft penetrates into the box body, and its bottom end is located in the installation groove at the bottom of the box body and is connected to the installation groove on the bottom of the box body through a bearing component.

[0007] The second gear is located above the second hole. Below the second gear, there is a second directly-connected spline shaft. The central shaft hole thereof is connected to the upper spline of the second directly-connected spline shaft. The upper part of the second gear is connected to the hole wall of the second hole of the box body through a bearing component, and the lower part is located in the input shaft hole of the box body and is also connected to the hole wall of the input shaft hole of the box body through a bearing component.

[0008] The backlash elimination mechanism includes a driven pulley, a main pulley, a transmission belt, and a belt adjusting component. The driven pulley is installed on the middle spline of the first directly-connected spline shaft. The main pulley is installed on the middle spline of the second directly-connected spline shaft. The main pulley and the driven pulley are connected by a transmission belt. The belt adjusting component is installed on the inner side wall of the box body opposite to the belt surface of the transmission belt.

[0009] The transmission mechanism includes a gearbox and a driving motor. The gearbox is arranged at the input shaft hole of the box body. Its output end is connected and transmitted to the lower spline of the second directly-connected spline shaft. The housing is fixed to the box body through a bolt structure. The driving motor is located at the input end of the gearbox. Its housing is connected and fixed to the outer shell of the gearbox. The transmission shaft is connected to the input end of the gearbox.

[0010] As an optimized solution for this case, the belt adjusting component includes a base, a support frame, and a roller. The bottom surface of the base is connected to the inner side wall of the box body and is opposite to the belt surface of the transmission belt. The support frame is installed at the midpoint of the top surface of the base. The roller is movably connected to the top surface of the support frame, and the wheel surface of the roller is arranged parallel to the belt surface of the moving belt. Its wheel surface contacts the belt surface and tightens the belt surface.

[0011] Further, in order to prevent the transmission belt from shifting when the roller tightens the belt surface of the transmission belt, the belt adjusting component further includes a limiting plate. The number of the limiting plates is two, which are respectively arranged on the two side end faces of the support frame and fixed to the base. The limiting grooves formed by the two opposite limiting plates limit the two sides of the belt surface of the transmission belt to prevent shifting.

[0012] As an optimized solution for this case, the backlash elimination mechanism includes a first worm gear, a first worm, a second worm gear, a second worm, a first pulley, a second pulley, and a transmission belt. The first worm gear is installed on the middle spline of the first directly-connected spline shaft. The second worm gear is installed on the second directly-connected spline shaft. The left end of the first worm is connected to the left side plate in the box body through a bearing component, and the worm teeth are engaged with the teeth of the first worm gear. The right end of the second worm is connected to the right side plate in the box body through a bearing component and passes through the outside of the box body, and the worm teeth are engaged with the teeth of the first worm gear. The right end of the first worm is connected to the left end of the second worm through a coupling.

[0013] The transmission mechanism includes a driving motor, which is arranged on the bottom surface of the box body. Its output shaft is arranged parallel to the second worm. The first belt pulley is installed on the output shaft of the driving motor, and the second belt pulley is installed at the right end of the second worm. The first belt pulley and the second belt pulley are connected by a transmission belt.

[0014] Beneficial effects: By arranging a backlash elimination mechanism in the turntable, during the transmission process, the single-motor gear realizes backlash elimination of gear transmission through belt tensioning. The gap between the double gears and the gear ring no longer needs to be adjusted and eliminated manually, effectively reducing the wear of mechanical parts and improving the machining accuracy of workpieces. Brief description of the drawings

[0015] Figure 1 It is a schematic structural diagram of the present invention in Embodiment 1.

[0016] Figure 2 It is Figure 1 the front view structural schematic diagram of.

[0017] Figure 3 It is Figure 1 the left view structural schematic diagram of.

[0018] Figure 4 It is Figure 2 the sectional view structural schematic diagram of B-B in.

[0019] Figure 5 It is Figure 3 the sectional view structural schematic diagram of A-A in.

[0020] Figure 6 It is a schematic structural diagram of the present invention in Embodiment 2.

[0021] Figure 7 It is Figure 6 the front view structural schematic diagram of.

[0022] Figure 8 It is Figure 6 the left view structural schematic diagram of.

[0023] Figure 9 It is Figure 7 the sectional view structural schematic diagram of E-E in.

[0024] Figure 10 It is Figure 8 the sectional view structural schematic diagram of A-A in.

[0025] In the figure: 1. Box body; 2. First gear; 3. Second gear; 4. First direct-coupled spline shaft; 5. Second direct-coupled spline shaft; 6. Driven pulley; 7. Main pulley; 8. Transmission belt; 9. Gearbox; 10. Driving motor; 11. Base; 12. Support frame; 13. Roller; 14. First worm gear; 15. First worm; 16. Second worm gear; 17. Second worm; 18. First pulley; 19. Second pulley; 20. Limit plate. Specific implementation mode

[0026] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] Among them, the same parts are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the accompanying drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component. Moreover, the accompanying drawings are all in a very simplified form and use non-precise ratios, only for the purpose of conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model. Embodiment 1

[0028] As Figures 1-5 shown, this embodiment discloses a backlash elimination device for a turntable double gear, which is used to eliminate the backlash of the gear components in the turntable drive. Specifically, it includes a box body 1, a first gear 2, a second gear 3, a backlash elimination mechanism and a transmission mechanism. A first hole is opened on the left side of the top surface of the box body 1. An outwardly protruding installation groove is provided at the bottom of the box body 1 opposite to the first hole below. A second hole identical to the first hole is opened on the right side of the top surface of the box body 1. An input shaft hole is opened on the bottom surface of the box body 1 opposite to the second hole.

[0029] See Figure 1 , Figure 2 and Figure 3 , the first gear 2 is arranged on the left side of the top surface of the box bottom and is located above the first hole. A first direct-coupled spline shaft 4 is provided below its bottom. See Figure 4 , the upper spline of the first direct-coupled spline shaft 4 is connected to the central shaft hole of the first gear 2. Its upper part is connected to the top surface of the box body 1 through a bearing. The remaining part of the first direct-coupled spline shaft 4 penetrates into the box body 1. Its bottom end is located in the installation groove at the bottom of the box body 1 at the bottom of the box body 1 and is connected to the installation groove on the bottom of the box body 1 through a bearing component.

[0030] From Figure 1 and Figure 2 it can be seen that the second gear 3 is located above the second hole. A second direct-coupled spline shaft 5 is provided below the second gear 3. Its central shaft hole is connected to the upper spline of the second direct-coupled spline shaft 5. See Figure 4, the upper part of the second gear 3 is connected to the hole wall of the second hole of the box body 1 through a bearing component, and the lower part is located in the input shaft hole of the box body 1 and is also connected to the hole wall of the input shaft hole of the box body 1 through a bearing component.

[0031] See Figure 4 and Figure 5 , the backlash elimination mechanism includes a driven pulley 6, a main pulley 7, a transmission belt 8 and a belt adjusting component. The driven pulley 6 is installed on the middle spline of the first direct-coupled spline shaft 4, the main pulley 7 is installed on the middle spline of the second direct-coupled spline shaft 5, the main pulley 7 and the driven pulley 6 are connected by the transmission belt 8, and the belt adjusting component is installed on the inner side wall of the box body 1 opposite to the belt surface of the transmission belt 8.

[0032] From Figure 5 it can be seen that the belt adjusting component includes a base 11, a support frame 12 and a roller 13. The bottom surface of the base 11 is connected to the inner side wall of the box body 1 and is opposite to the belt surface of the transmission belt 8. The support frame 12 is installed at the midpoint of the top surface of the base 11. The roller 13 is movably connected to the top surface of the support frame 12, and the wheel surface of the roller 13 is arranged parallel to the belt surface of the moving belt. Its wheel surface contacts the belt surface and tightens the belt surface.

[0033] The belt adjusting component further includes a limiting plate 20. The number of the limiting plates 01 is two, which are respectively arranged on both side end faces of the support frame 12 and fixed to the base 11. The limiting grooves formed by the two limiting plates 20 limit both sides of the belt surface of the transmission belt 8 to prevent deviation.

[0034] See Figure sum Figure 2 , the transmission mechanism includes a gearbox 9 and a driving motor 10. The gearbox 9 is arranged at the input shaft hole of the box body 1, and its output end is connected to the lower spline of the second direct-coupled spline shaft 5 for transmission. The housing is fixedly connected to the box body 1 through a bolt structure. The driving motor 10 is located at the input end of the gearbox 9, and its housing is fixedly connected to the outer shell of the gearbox 9. The transmission shaft is connected to the input end of the gearbox 9.

[0035] During operation, the double-gear single-motor realizes gear transmission backlash elimination through the tensioning of the transmission belt 8. The driving motor 10 is directly connected to the main pulley 7 through a reducer. The driven pulley 6 and the main pulley 7 are connected by the transmission belt 8. An adjustable roller 13 is used between the pulleys to realize belt tensioning. The belt tensioning is connected to the gears through a directly-connected spline shaft to realize double-gear reverse backlash elimination. Embodiment 2

[0036] See Figures 6-10 , the difference from Embodiment 1 is: See Figure 9 and Figure 10, the backlash elimination mechanism includes a first worm gear 14, a first worm 15, a second worm gear 16, a second worm 17, a first belt pulley 18, a second belt pulley 19 and a transmission belt 8. The first worm gear 14 is installed on the middle spline of the first direct-coupling spline shaft 4, and the second worm gear 16 is installed on the second direct-coupling spline shaft 5. The left end of the first worm 15 is connected to the left side plate inside the box body 1 through a bearing component, and the worm teeth are meshed with the teeth of the first worm gear 14. The right end of the second worm 17 is connected to the right side plate inside the box body 1 through a bearing component and passes through the outside of the box body 1, and the worm teeth are meshed with the teeth of the first worm gear 14. The right end of the first worm 15 is connected to the left end of the second worm 17 through a coupling.

[0037] See Figures 6-8 , the transmission mechanism includes a driving motor 10. The driving motor 10 is arranged on the bottom surface of the box body 1, and its output shaft is arranged parallel to the second worm 17. The first belt pulley 18 is installed on the output shaft of the driving motor 10, and the second belt pulley 19 is installed at the right end of the second worm 17. The first belt pulley 18 and the second belt pulley 19 are connected by a transmission belt 8 for transmission.

[0038] During operation, with the input of the driving motor 10, the worm is driven through the belt drive of the two belt pulleys, thereby driving the two worm gear direct-coupled gears, and adjusting the reverse dimension of the worm to drive the worm gear direct-coupled gears to achieve reverse backlash elimination.

[0039] The above embodiments only illustrate the principle and its effects of the present invention by way of example, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A backlash elimination device for a turntable double gear, comprising a box body (1), a first gear (2), a second gear (3), a backlash elimination mechanism and a transmission mechanism, characterized in that: On the left side of the top surface of the box body (1), a first hole is provided. Below the first hole, at the bottom of the box body (1) opposite thereto, there is an outwardly protruding mounting groove. On the right side of the top surface of the box body (1), a second hole identical to the first hole is provided. On the bottom surface of the box body (1) opposite to the second hole, an input shaft hole is provided. The first gear (2) is arranged on the left side of the top surface of the box bottom and above the first hole. A first direct-coupling spline shaft (4) is provided below its bottom. The upper spline of the first direct-coupling spline shaft (4) is connected to the central shaft hole of the first gear (2). Its upper part is connected to the top surface of the box body (1) through a bearing. The remaining part of the first direct-coupling spline shaft (4) penetrates into the box body (1). Its bottom end is located in the mounting groove at the bottom of the box body (1) and is connected to the mounting groove on the bottom of the box body (1) through a bearing component. The second gear (3) is located above the second hole. A second direct-coupling spline shaft (5) is provided below the second gear (3). Its central shaft hole is connected to the upper spline of the second direct-coupling spline shaft (5). The upper part of the second gear (3) is connected to the hole wall of the second hole of the box body (1) through a bearing component. The lower part is located in the input shaft hole of the box body (1) and is also connected to the hole wall of the input shaft hole of the box body (1) through a bearing component. The backlash elimination mechanism includes a driven pulley (6), a main pulley (7), a transmission belt (8), and a belt adjustment component. The driven pulley (6) is installed on the middle spline of the first direct-coupling spline shaft (4). The main pulley (7) is installed on the middle spline of the second direct-coupling spline shaft (5). The main pulley (7) and the driven pulley (6) are connected by a transmission belt (8). The belt adjustment component is installed on the inner side wall of the box body (1) opposite to the belt surface of the transmission belt (8). The transmission mechanism includes a gearbox (9) and a driving motor (10). The gearbox (9) is arranged at the input shaft hole of the box body (1). Its output end is connected and transmitted to the lower spline of the second direct-coupling spline shaft (5). The housing is fixedly connected to the box body (1) through a bolt structure. The driving motor (10) is located at the input end of the gearbox (9). Its housing is fixedly connected to the outer shell of the gearbox (9). The transmission shaft is connected to the input end of the gearbox (9).

2. The double-gear backlash elimination device for a turntable according to claim 1, characterized in that: The belt adjustment component includes a base (11), a support frame (12), and a roller (13). The bottom surface of the base (11) is connected to the inner side wall of the box body (1) and is opposite to the belt surface of the transmission belt (8). The support frame (12) is installed at the midpoint of the top surface of the base (11). The roller (13) is movably connected to the top surface of the support frame (12). The wheel surface of the roller (13) is arranged parallel to the belt surface of the moving belt. Its wheel surface contacts the belt surface and tightens the belt surface.

3. A turntable double gear backlash elimination device according to claim 2, characterized in that: The belt adjustment component further includes a limit plate (20). The number of the limit plates (20) is two, which are respectively arranged on the two side end faces of the support frame (12) and fixed to the base (11). The limit grooves formed by the two opposite limit plates (20) limit the two sides of the belt surface of the transmission belt (8) to prevent deviation.

4. A turntable double gear backlash elimination device according to claim 1, characterized in that: The backlash elimination mechanism includes a first worm gear (14), a first worm (15), a second worm gear (16), a second worm (17), a first belt pulley (18), a second belt pulley (19) and a transmission belt (8). The first worm gear (14) is installed on the middle spline of the first directly-connected spline shaft (4), and the second worm gear (16) is installed on the second directly-connected spline shaft (5). The left end of the first worm (15) is connected to the left side plate inside the box body (1) through a bearing component, and the worm teeth are meshed with the teeth of the first worm gear (14). The right end of the second worm (17) is connected to the right side plate inside the box body (1) through a bearing component and passes out of the box body (1), and the worm teeth are meshed with the teeth of the first worm gear (14). The right end of the first worm (15) is connected to the left end of the second worm (17) through a coupling; The transmission mechanism includes a driving motor (10). The driving motor (10) is arranged on the bottom surface of the box body (1), and its output shaft is arranged parallel to the second worm (17). The first belt pulley (18) is installed on the output shaft of the driving motor (10), and the second belt pulley (19) is installed at the right end of the second worm (17). The first belt pulley (18) and the second belt pulley (19) are connected by a transmission belt (8) for transmission connection.

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