Pneumatic double-gear anti-backlash mechanism

Abstract

The utility model relates to the field of laser cutting, in particular to a pneumatic double-gear anti-backlash mechanism which comprises a linear sliding rail and a sliding table, the linear sliding rail is located on the side of a helical rack, a fixed driving device and a gear anti-backlash device are arranged on the sliding table, the fixed driving device is provided with a driving gear, and the gear anti-backlash device is arranged on the gear anti-backlash device. The driving gear is meshed with the helical rack, the gear anti-backlash device is provided with a floating gear, the floating gear is meshed with the helical rack, and the meshing surface of the floating gear and the helical rack is opposite to the meshing surface of the driving gear and the helical rack. On one hand, too small gaps cause too large driving torque and decrease of servo control characteristics, and on the other hand, too large gaps cause poor precision of linear reciprocating motion.

Description

Technical Field

[0001] The utility model relates to the field of laser cutting, and in particular to a pneumatic double-gear backlash eliminating mechanism. Background Art

[0002] At this stage, laser cutting machines are equipped with linear motion drive mechanisms, which are mostly in the form of gears and racks. The meshing gap between the two is fixed and adjusted, and there is artificial adjustment of the gap amount. On the one hand, a gap that is too small will cause excessive driving torque and degrade the servo control characteristics. On the other hand, a gap that is too large will cause poor linear reciprocating motion accuracy, and it is impossible to compensate for the linear motion positioning error caused by the rack pitch error during machine operation. The accuracy gradually decreases with the service life of the machine, which is ultimately reflected in the size and geometric accuracy of the cut parts. Utility Model Content

[0003] The utility model provides a pneumatic double-gear backlash elimination mechanism, which solves the problem of artificial adjustment of the gap in the current laser cutting machine. On the one hand, too small a gap causes excessive driving torque and reduced servo control characteristics, and on the other hand, too large a gap causes poor linear reciprocating motion accuracy.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a pneumatic double-gear anti-backlash mechanism, including a linear slide rail and a sliding table, the linear slide rail is located on the right side of the bevel rack, the sliding table is slidably connected to the linear slide rail, and a fixed driving device and a gear anti-backlash device are arranged on the sliding table, the gear anti-backlash device is located beside the fixed driving device, the fixed driving device is provided with a driving gear, the driving gear is meshed with the bevel rack, the gear anti-backlash device is provided with a floating gear, the floating gear is meshed with the bevel rack, and the meshing surface of the floating gear and the bevel rack is opposite to the meshing surface of the driving gear and the bevel rack.

[0005] Preferably, the fixed driving device includes a servo motor and a reducer, the reducer is installed on the sliding table, the servo motor is installed on the reducer, the output shaft of the reducer passes through the sliding table, and the driving gear is installed on the output shaft of the reducer.

[0006] Preferably, a lubrication device is also included, and the lubrication device is located in the middle of the fixed driving device and the gear anti-backlash device. A lubrication groove is arranged on the sliding table. The lubrication device includes a lubrication axle and a felt gear. A lubrication through hole is opened in the lubrication groove. The lubrication axle is arranged in the lubrication through hole. A pipe joint is arranged at the upper end of the lubrication axle, and the pipe joint is communicated with the lubrication axle. The felt gear is arranged at the lower end of the lubrication axle, and the felt gear is meshed with the helical rack.

[0007] Preferably, the gear eliminating backlash device includes a mounting frame and a floating cylinder, an air source inlet is opened on the mounting frame, the air source inlet is communicated with the floating cylinder, the floating cylinder is mounted on the mounting frame, the fixing point of the mounting frame on the sliding table is a special fulcrum, an eliminating backlash slide rail is arranged on the inner side of the mounting frame, a sliding block is arranged on the telescopic rod of the floating cylinder, a sliding groove matching the eliminating backlash slide rail is arranged on the sliding block, the sliding block is slidably connected with the mounting frame, a limiting groove is arranged on the sliding table, the length of the limiting groove is greater than the length of the sliding block, the lower part of the sliding block is located in the limiting groove, the lower end face of the sliding block is provided with a floating gear shaft, the floating gear shaft passes through the sliding table, and the floating gear is mounted on the floating gear shaft.

[0008] The beneficial effects of adopting the above technical solution are:

[0009] There is a relative positional relationship between the special fulcrum and the driving gear. The floating gear is an inert gear. Through air pressure adjustment, the positions of the driving gear and the floating gear are in a tensioned state under the action of air pressure. The meshing surfaces of the two sets of gears and the helical rack are opposite, so as to optimize the meshing clearance between the gear mechanism and the rack. Moreover, the inherent pitch error of the rack can be automatically compensated during use, which greatly improves the size and geometric error of the cutting parts, and the accuracy does not decrease after long-term use.

[0010] The pressure gas input by the floating cylinder can be preset to ensure that the meshing conditions of the gears and helical racks remain unchanged during the use of the machine and during the reversing process of the sliding body.

[0011] The output force of the floating cylinder is controlled by the air source pressure at the air source inlet to ensure the meshing accuracy of the two sets of gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front three-dimensional schematic diagram of the utility model;

[0013] Figure 2 It is a rear-view stereoscopic schematic diagram of the utility model;

[0014] Figure 3 It is a three-dimensional schematic diagram of a gear backlash eliminating device;

[0015] Figure 4 It is a schematic diagram of the working principle of the utility model.

[0016] The symbols in the figure correspond respectively to: 1- linear slide rail, 2- sliding table, 3- linear slider, 4- bevel rack, 5- servo motor, 6- reducer, 7- driving gear, 8- gear anti-backlash device, 81- mounting frame, 82- floating cylinder, 83- air source inlet, 84- special fulcrum, 85- anti-backlash slide rail, 86- sliding block, 9- limiting groove, 10- floating gear, 12- lubrication groove, 13- lubrication axle, 14- felt gear, 15- pipe joint. DETAILED DESCRIPTION

[0017] The specific implementation methods of the utility model are further explained in detail below with reference to the accompanying drawings through the description of embodiments, with the aim of helping technicians in the field to have a more complete, accurate and in-depth understanding of the concept and technical solution of the utility model and facilitating its implementation. Example

[0018] like Figure 1-Figure 4As shown, the utility model is a pneumatic double-gear backlash elimination mechanism, including a linear slide 1 and a sliding table 2, a linear slider 3 is arranged below the sliding table 2, the sliding table 2 is slidably connected to the linear slide 1 through the linear slider 3, the linear slide 1 is located on the right side of the helical rack 4, a fixed driving device and a gear backlash elimination device are arranged on the sliding table 2, the fixed driving device includes a servo motor 5 and a reducer 6, the reducer 6 is installed on the sliding table 2, the servo motor 5 is installed on the reducer 6, the output shaft of the reducer 6 passes through the sliding table 2 and is installed with a driving gear 7, the driving gear 7 The gear clearance eliminating device 8 is meshed with the helical rack 4, and includes a mounting frame 81 and a floating cylinder 82. The floating cylinder 82 is mounted on the mounting frame 81, and an air source inlet 83 is provided on the mounting frame 81. The air source inlet 83 is connected to the floating cylinder 82. The fixing point of the mounting frame 81 on the sliding table 2 is a special fulcrum 84. An anti-backlash slide rail 85 is provided on the inner side of the mounting frame 81. A sliding block 86 is provided on the telescopic rod of the floating cylinder 82. A sliding groove matching the anti-backlash slide rail 85 is provided on the sliding block 86. The sliding block 86 is slidably connected to the mounting frame 81. A limiting groove 9 is provided on the sliding table 2, and the length of the limiting groove 9 is greater than the length of the sliding block 86. The lower part of the sliding block 86 is located in the limiting groove 9. When in use, the sliding block 86 can move in the limiting groove 9 along the direction of the anti-backlash slide rail 85 to perform fine adjustment to compensate for the inherent pitch error of the helical rack. A floating gear shaft is provided on the lower end surface of the sliding block 86. The floating gear shaft passes through the sliding table 2 and is installed with a floating gear 10. It also includes a lubricating device, which is located in the middle of the fixed driving device and the gear anti-backlash device 8. A lubricating device is provided on the sliding table 2. The sliding groove 12, the lubrication device includes a lubrication wheel shaft 13 and a felt gear 14, a lubrication through hole is opened in the lubrication groove 12, the lubrication wheel shaft 13 is arranged in the lubrication through hole, a pipe joint 15 is arranged at the upper end of the lubrication wheel shaft 13, the pipe joint 15 and the lubrication wheel shaft 13 are connected, the felt gear 14 is arranged at the lower end of the lubrication wheel shaft 13, the felt gear 14 and the helical rack 4 are meshed, when in use, by adding lubricating oil into the lubrication groove 12, the lubricating oil enters the lubrication wheel shaft 13 through the pipe joint 15, and then lubricates the helical rack 4 through the felt gear 14.

[0019] When in use, the servo motor 5 and the reducer 6 directly output the driving torque, which acts on the bevel rack 4 through the driving gear 7. Since the bevel rack 4 is fixedly installed, the driving torque is converted into the driving force of linear motion. The floating gear 82 is an inert gear. The pressurized gas is connected to the floating cylinder through the gas source inlet 83. Under the thrust of the floating cylinder 82, the floating gear 10 is in a tensioned state. The meshing surfaces of the two sets of gears and the bevel rack 4 are opposite. Since the fixed point of the mounting frame 81 fixed on the sliding table 2 is a special fulcrum 84, it has a relative positional relationship with the driving gear 7. Under the action of the floating cylinder 82, the floating gear 10 meshes with the right tooth surface of the bevel rack 4 along the floating adjustment direction, and the driving gear 7 meshes with the left tooth surface of the bevel rack 4, thereby realizing the optimization of the meshing gap between the gear mechanism and the rack, and the inherent pitch error of the rack can be automatically compensated during use, which greatly improves the size and geometric errors of the cut parts, and the accuracy does not decrease after long-term use.

[0020] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0021] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above-mentioned concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A pneumatic double-gear backlash elimination mechanism, comprising a linear slide rail (1) and a sliding table (2), wherein the linear slide rail (1) is located beside a helical rack (4), and the sliding table (2) is slidably connected to the linear slide rail (1), characterized in that: A fixed driving device and a gear backlash eliminating device (8) are provided on the sliding table (2). The gear backlash eliminating device (8) is located on the right side of the fixed driving device. The fixed driving device is provided with a driving gear (7). The driving gear (7) is meshed with the bevel rack (4). The gear backlash eliminating device (8) is provided with a floating gear (10). The floating gear (10) is meshed with the bevel rack (4). The meshing surface between the floating gear (10) and the bevel rack (4) is opposite to the meshing surface between the driving gear (7) and the bevel rack (4).

2. A pneumatic double-gear backlash eliminating mechanism according to claim 1, characterized in that: The fixed drive device comprises a servo motor (5) and a reducer (6), wherein the reducer (6) is mounted on the sliding table (2), the servo motor (5) is mounted on the reducer (6), an output shaft of the reducer (6) passes through the sliding table (2), and the driving gear (7) is mounted on the output shaft of the reducer (6).

3. A pneumatic double-gear backlash eliminating mechanism according to claim 1, characterized in that: The invention also comprises a lubrication device, wherein the lubrication device is located in the middle of the fixed drive device and the gear backlash elimination device (8), a lubrication groove (12) is provided on the sliding table (2), the lubrication device comprises a lubrication axle (13) and a felt gear (14), a lubrication through hole is provided in the lubrication groove (12), the lubrication axle (13) is arranged in the lubrication through hole, a pipe joint (15) is provided at the upper end of the lubrication axle (13), the pipe joint (15) and the lubrication axle (13) are connected, the felt gear (14) is provided at the lower end of the lubrication axle (13), and the felt gear (14) is meshed with the helical rack (4).

4. A pneumatic double-gear backlash eliminating mechanism according to claim 1, characterized in that: The gear backlash eliminating device (8) comprises a mounting frame (81) and a floating cylinder (82), an air source inlet (83) is provided on the mounting frame (81), the air source inlet (83) is communicated with the floating cylinder (82), the floating cylinder (82) is mounted on the mounting frame (81), the fixing point of the mounting frame (81) on the sliding table (2) is a special fulcrum (84), an anti-backlash slide rail (85) is provided on the inner side of the mounting frame (81), and a sliding block (86) is provided on the telescopic rod of the floating cylinder (82). The sliding block (86) is provided with a sliding groove matching the anti-backlash sliding rail (85), the sliding block (86) is slidably connected to the mounting frame (81), a limiting groove (9) is provided on the sliding table (2), the length of the limiting groove (9) is greater than the length of the sliding block (86), the lower part of the sliding block (86) is located in the limiting groove (9), the lower end surface of the sliding block (86) is provided with a floating gear shaft, the floating gear shaft passes through the sliding table (2), and the floating gear (10) is installed on the floating gear shaft.

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