Gear meshing back clearance adjusting device for four-axis rotary table

Abstract

The utility model relates to the technical field of four-axis rotary table structures, in particular to a gear meshing back clearance adjusting device of a four-axis rotary table. Comprising a box body, a roller cam arranged in the box body, a first gear coaxially arranged with the roller cam and a driving assembly, the driving assembly comprises a servo motor installed on the box body through a motor plate and a second gear fixedly connected with an output shaft of the servo motor, and the second gear and the first gear form a transmission meshing pair; a first shaft hole is formed in a side plate of the box body, the motor plate covers the first shaft hole and then is mounted on the side plate through an adjusting assembly, and the adjusting assembly comprises an adjusting part for enabling a plurality of point positions on the motor plate to be close to or away from the side plate and a fixing part for fixing the adjusted motor plate on the side plate; the parallelism of the central axis of the first gear and the central axis of the second gear and the distance between the central axis of the second gear and the central axis of the first gear can be adjusted, the structure is simple, and practicability is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to four -axis rotary table structure technical field especially relates to a four -axis rotary table gear meshing backlash adjusting device. BACKGROUND

[0002] Four -axis rotary table is a kind of equipment used in numerical control machine tool, mainly used to increase the machining capacity of machine tool, so that it can carry out more complex machining operation. Four -axis rotary table is realized the automatic indexing, rotation and positioning function of workpiece by increasing a rotating shaft on the basis of three -axis numerical control machine tool, usually a numerical control index plate that can rotate 360 degrees, four -axis rotary table includes roller cam, turret, servo motor, servo motor output gear, camshaft gear in structure, roller cam is engaged with turret and the axial direction of two perpendicular each other;Camshaft gear is coaxially arranged with roller cam, servo motor output gear and camshaft gear are engaged with each other, servo motor is used as power source, drives camshaft gear rotation through servo motor output gear, camshaft gear drives roller cam rotation, roller cam drives turret rotation, in turn, rotation is transmitted to turret.

[0003] In the assembly process of four -axis rotary table, the engagement of roller cam and turret needs to be realized no-backlash design by debugging, to avoid positioning error caused by gap when forward and reverse, specifically, the front and back, left and right positions of roller cam are adjusted by eccentric cover, when the position of roller cam is adjusted, the problem of too large gap between camshaft gear coaxial with roller cam and servo motor output gear and the non-parallelism of the central axes of the two will occur, too large gear meshing gap is directly transmitted to rotary table movement, causes indexing positioning deviation, affects machining repeat accuracy;The non-parallelism of the central axes of camshaft gear and servo motor output gear will cause uneven force on gear meshing surface, produce lateral deviation force, aggravate rotary table movement trajectory drift, affect multi-axis linkage machining accuracy.

[0004] In the prior art, there is usually only a mechanism for adjusting the too large gap between camshaft gear and servo motor output gear, but the adjustment is inconvenient and the adjustment accuracy is low;The present application provides a four -axis rotary table gear meshing backlash adjusting device to solve the problems in the prior art. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a four -axis rotary table gear meshing backlash adjusting device to solve the problems in the prior art, such as there is usually only a mechanism for adjusting the too large gap between camshaft gear and servo motor output gear, but the adjustment is inconvenient and the adjustment accuracy is low, and there is no mechanism for adjusting the non-parallelism of the central axes of camshaft gear and servo motor output gear.

[0006] The utility model discloses a technical scheme is: a four -axis rotary table gear meshing backlash adjusting device, including the box, the roller cam of setting in the box and the coaxial setting first gear of with it, drive assembly,

[0007] The drive assembly includes a servo motor mounted on the box through a motor plate, and a second gear fixedly connected with the output shaft of the servo motor, and the second gear and the first gear form a transmission meshing pair.

[0008] A first shaft hole is formed in the side plate of the box, and the motor plate is installed on the side plate through an adjusting assembly after covering the first shaft hole, the adjusting assembly includes adjusting pieces for moving multiple points on the motor plate closer to or farther away from the side plate, and fixing pieces for fixing the motor plate on the side plate after adjustment.

[0009] A second shaft hole is formed in the motor plate, and the servo motor is installed on the motor plate after covering the second shaft hole; an eccentric ring that can be rotated and adjusted is rotatably installed at the second shaft hole of the motor plate, and the housing of the servo motor is clamped in the eccentric hole of the eccentric ring in a gap fit mode.

[0010] The first shaft hole, the second shaft hole and the eccentric hole of the eccentric ring jointly form an axle system channel of the output shaft of the servo motor; a window is formed in the box for observing the meshing position of the second gear and the first gear.

[0011] Preferably, the adjusting pieces are stop screws, and a plurality of stop screw holes are formed in the motor plate in a penetrating manner;

[0012] The fixing pieces are first screws, a plurality of first screw holes are formed in the motor plate in a penetrating manner, and a plurality of second screw holes are formed in the side plate corresponding to the plurality of first screw holes.

[0013] Preferably, the plurality of stop screws are arranged at four corners of the motor plate.

[0014] Preferably, a coaxial annular groove is formed in the motor plate around the second shaft hole, and the eccentric ring is gap-fitted in the annular groove;

[0015] The body of the motor plate is provided with a slot opening that is in communication with the annular groove, and the slot bottom surface of the slot opening is parallel to the slot bottom surface of the annular groove; the slot bottom surface of the slot opening is provided with a scale line for indicating the rotational displacement of the eccentric ring;

[0016] A plurality of insertion holes are formed in the outer ring wall of the eccentric ring along the radial direction inwardly, and the plurality of insertion holes are uniformly distributed along the circumferential direction of the eccentric ring; a wrench is inserted into the insertion hole from the slot opening to drive the eccentric ring to rotate along the central axis of the annular groove.

[0017] Preferably, the housing of the servo motor is provided with a ring-shaped boss that matches the diameter of the eccentric hole.

[0018] Preferably, a plurality of third screw holes are formed on the motor plate, a mounting flange is arranged on the servo motor, a plurality of through holes are formed on the mounting flange corresponding to the plurality of third screw holes, and the servo motor is fixed on the motor plate through second screws, the diameter of the screw rod of the second screw is smaller than the diameter of the through hole.

[0019] Preferably, a first sealing ring is arranged between the side plate and the motor plate, a second sealing ring is arranged between the motor plate and the eccentric ring, and a third sealing ring is arranged between the eccentric ring and the housing of the servo motor.

[0020] Preferably, a first mounting groove for mounting the first sealing ring is formed on the side plate in combination with the motor plate, a second mounting groove for mounting the second sealing ring is formed on the motor plate in combination with the eccentric ring, and a third mounting groove for mounting the third sealing ring is formed on the eccentric ring in combination with the housing of the servo motor.

[0021] Compared with the prior art, the four-axis rotary table gear meshing backlash adjusting device has the following advantages:

[0022] (1) The four-axis rotary table gear meshing backlash adjusting device, the motor plate is installed on the side plate of the box through the adjusting assembly, the adjusting assembly comprises stop screws installed at four corner portions of the motor plate and first screws for fixing the motor plate after adjustment on the side plate, and the central axis of the second gear can be adjusted along the axial direction and the radial direction of the second gear by screwing the four stop screws, so that the central axis of the first gear is parallel to the central axis of the second gear, the adjusting assembly has the advantages of simple structure and high practicability, and the adjusting process does not need to disassemble the gear or the box structure, but only needs to externally screw the stop screws, so that the use is convenient.

[0023] (2) The four-axis rotary table gear meshing backlash adjusting device, the servo motor is installed on the motor plate, the motor plate is rotatably installed with an eccentric ring, and the housing of the servo motor is embedded and clamped in the eccentric hole of the eccentric ring in a gap fit mode; a wrench is inserted into the insertion hole of the eccentric ring from the slot opening to drive the eccentric ring to rotate along the central axis of the annular groove, the eccentric ring drives the motor embedded and clamped in the eccentric hole to displace in the vertical direction, so that the distance between the central axes of the second gear and the first gear can be adjusted, the motor plate is provided with a scale line, and an operator can directly read the center distance adjustment amount, and the eccentric ring is convenient and fast to adjust. BRIEF DESCRIPTION OF DRAWINGS

[0024] The utility model will be further described in connection with the drawings and embodiments:

[0025] Figure 1 It is a structural schematic view of the four-axis rotary table gear meshing backlash adjusting device described in the embodiment;

[0026] Figure 2 Another perspective view of the structure of the gear meshing back lash adjusting device of the four-axis rotary table according to the embodiment;

[0027] Figure 3 The assembly structure diagram of the motor plate and eccentric ring according to the embodiment;

[0028] Figure 4 The top view of Figure 3 ;

[0029] Figure 5 The structure diagram of the eccentric ring according to the embodiment;

[0030] Figure 6 The assembly structure diagram of the motor plate, eccentric ring and shell of the servo motor according to the embodiment. Wherein: 1, box body, 2, first gear, 3, servo motor, 4, second gear, 5, eccentric ring, 6, annular boss, 7, stop screw, 8, stop screw hole, 9, first screw, 10, first screw hole, 11, annular groove, 12, slot, 13, scale line, 14, jack, 15, third screw hole, 16, second screw, 17, second mounting groove, 18, third mounting groove, 19, window, 20, motor plate. DETAILED DESCRIPTION

[0031] The content of the utility model will be further described in detail in combination with specific embodiments:

[0032] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or positional relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0033] As Figure 1 , Figure 2As shown, a four-axis rotary table gear meshing backlash adjusting device includes a box body 1, a roller cam arranged in the box body 1 and a first gear 2 coaxially arranged with the roller cam, a driving assembly, the driving assembly including a servo motor 3 mounted on the box body 1 through a motor plate 20 and a second gear 4 fixedly connected with an output shaft of the servo motor 3, the second gear 4 and the first gear 2 forming a transmission meshing pair; a first shaft hole is formed in a side plate of the box body 1, the motor plate 20 is mounted on the side plate through an adjusting assembly after covering the first shaft hole, the adjusting assembly including an adjusting piece (i.e. realizing multi-angle inclination of the motor plate 20 relative to the side plate) for realizing that multiple point positions on the motor plate 20 are close to or away from the side plate (since the servo motor 3 is fixed on the motor plate 20, the second gear 4 is coaxial with the output shaft of the servo motor 3, i.e. the central axis of the second gear 4 can be angularly adjusted along the axial direction and the radial direction of the second gear 4, so that the central axes of the first gear 2 and the second gear 4 are parallel), a fixing piece for fixing the motor plate 20 after adjustment on the side plate; as shown Figure 6 As shown, a second shaft hole is formed in the motor plate 20, the servo motor 3 is mounted on the motor plate 20 after covering the second shaft hole; a rotatable adjusting eccentric ring 5 is rotatably mounted at the second shaft hole of the motor plate 20 (as shown Figure 3 、 Figure 4 、 Figure 5 As shown), the housing of the servo motor 3 is clamped in the eccentric hole of the eccentric ring 5 in a gap fit mode, the housing of the servo motor 3 is provided with an annular boss 6 matched with the diameter of the eccentric hole, in this embodiment, as shown Figure 6 The annular boss 6 of the servo motor 3 is clamped in the eccentric hole, when the eccentric ring 5 rotates in the annular groove 11, the servo motor 3 does not rotate with the eccentric ring 5, but only produces displacement in the vertical direction; the first shaft hole, the second shaft hole and the eccentric hole of the eccentric ring 5 jointly constitute an axle system channel of the output shaft of the servo motor 3, when the servo motor 3 with the installed second gear 4 is mounted on the motor plate 20, the axle system channel is used for allowing the second gear 4 to pass into the box body 1 and then accommodating the output shaft of the servo motor 3; a window 19 for observing the meshing position of the second gear 4 and the first gear 2 is formed in the box body 1, the window 19 is a stepped cylindrical tube body inlaid with glass and is fixed on the box body 1 through threads; in this embodiment, two window 19s are arranged on opposite sides of the box body 1; the window 19 can be used for observing the meshing condition of the second gear 4 and the first gear 2 on one hand, and can be used for observing the injection amount of gear lubricating oil in the box body 1 on the other hand.

[0034] As shown Figure 2 、 Figure 3As shown, the adjusting member is a set screw 7, a plurality of set screw holes 8 are through-opened on the motor plate 20, the multi-angle inclination of the motor plate 20 relative to the side plate is adjusted by screwing the set screw 7 in the set screw hole 8, when the set screw 7 is screwed in the set screw hole 8 and the head of the set screw 7 abuts against the box 1, the motor plate 20 is away from the box 1 by continuously screwing in, when the set screw 7 is screwed out of the set screw hole 8 and the head of the set screw 7 abuts against the box 1, the motor plate 20 is close to the box 1 by continuously screwing out; the fixing member is a first screw 9, a plurality of first screw holes 10 are through-opened on the motor plate 20, a plurality of second screw holes are opened on the side plate corresponding to the plurality of first screw holes 10. The plurality of set screws 7 are arranged at the four corners of the motor plate 20.

[0035] As shown, a coaxial annular groove 11 (as shown in 6) is opened around the second shaft hole on the motor plate 20, the eccentric ring 5 is gap-fitted in the annular groove 11; the body of the motor plate 20 is opened with a slot 12 (as shown in Figure 1 、 Figure 2 As shown, the slot bottom surface of the slot 12 is parallel to the slot bottom surface of the annular groove 11; the slot bottom surface of the slot 12 is provided with a scale line 13 for indicating the rotational displacement of the eccentric ring 5; a plurality of insertion holes 14 (as shown in Figure 4 As shown, the slot bottom surface of the slot 12 is parallel to the slot bottom surface of the annular groove 11; the slot bottom surface of the slot 12 is provided with a scale line 13 for indicating the rotational displacement of the eccentric ring 5; a plurality of insertion holes 14 (as shown in

[0036] As shown, a plurality of third screw holes 15 are opened on the motor plate 20, the mounting flange is provided on the servo motor 3, a plurality of through holes are through-opened on the mounting flange corresponding to the plurality of third screw holes 15, the servo motor 3 is fixed on the motor plate 20 through the second screw 16, the diameter of the screw rod of the second screw 16 is smaller than the diameter of the through hole, so that there is a movement gap between the through hole and the screw rod of the second screw 16, so as to realize that the servo motor 3 can produce displacement up and down under the drive of the eccentric ring 5, and further realize the adjustment of the distance between the central axes of the first gear 2 and the second gear 4. Figure 3

[0037] ​The first sealing ring is arranged between the side plate and the motor plate 20, the second sealing ring is arranged between the motor plate 20 and the eccentric ring 5, and the third sealing ring is arranged between the eccentric ring 5 and the shell of the servo motor 3. The first sealing groove for mounting the first sealing ring is formed in the side plate, the second sealing groove 17 for mounting the second sealing ring is formed in the motor plate 20, and the third sealing groove 18 for mounting the third sealing ring is formed in the eccentric ring 5. The sealing rings can prevent the lubricating oil in the gear box 1 from overflowing.

[0038] The working principle of the four-axis rotary table gear meshing backlash adjusting device in the utility model is as follows: the initial state is that the backlash between the roller cam and the turret has been adjusted, the servo motor 3 is pre-installed on the motor plate 20 (that is, the second screw 16 for installing the servo motor 3 is not tightened, and the position of the servo motor 3 can be slightly adjusted), the red lead powder is mixed into paste by adding oil, the paste is uniformly coated on the meshing surface of the first gear 2 and the second gear 4 through the oil mirror hole or the oil injection hole, the first gear 2 and the second gear 4 are rotated, the pre-pressing traces of the first gear 2 and the second gear 4 are observed through the endoscope probe from the viewing window 19, and the meshing state of the first gear 2 and the second gear 4 is judged through the pre-pressing traces; after the paste is uniformly coated, the tooth surface of the first gear 2 and the second gear 4 is red, when the first gear 2 and the second gear 4 are rotated, the actual contact surface of the two gears will be bright (the gear color), four stop screws 7 are respectively screwed to adjust the position of the motor plate 20, until the complete bright surface is adjusted (when the central axes of the first gear 2 and the second gear 4 are parallel, the paste red lead powder is squeezed away, and the complete bright surface is presented), after the adjustment is completed, the paste red lead powder is coated again, the first gear 2 and the second gear 4 are rotated, the meshing traces are observed, and after it is confirmed that the central axes of the first gear 2 and the second gear 4 are parallel, the first screw 9 is tightened to fix the motor plate 20 on the gear box 1; secondly, the wrench is inserted into the insertion hole 14 of the eccentric ring 5, the eccentric ring 5 is rotated to adjust the spacing of the central axes of the first gear 2 and the second gear 4, after the adjustment is completed, the second screw 16 is tightened to fix the servo motor 3 on the motor plate 20. If it is not the debugging of the four-axis rotary table for the first time, but the backlash of the two gears is adjusted after a period of use, the gear lubricating oil in the gear box is removed, and then the parallelism of the central axes of the first gear 2 and the second gear 4 is adjusted first, and then the spacing of the central axes of the first gear 2 and the second gear 4 is adjusted according to the above method.

[0039] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application, therefore, from any point of view, the examples should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A four-axis rotary table gear meshing backlash adjustment device, comprising a housing, a roller cam disposed within the housing, a first gear coaxially disposed therewith, and a drive assembly, characterized in that: The drive assembly includes a servo motor mounted on the housing via a motor plate, and a second gear fixedly connected to the output shaft of the servo motor, wherein the second gear and the first gear form a transmission meshing pair; The side panel of the housing has a first shaft hole. After the motor plate covers the first shaft hole, it is installed on the side panel through an adjustment component. The adjustment component includes an adjustment component that enables multiple points on the motor plate to move closer to or further away from the side panel, and a fixing component that fixes the adjusted motor plate on the side panel. The motor plate has a second shaft hole, and the servo motor is mounted on the motor plate after covering the second shaft hole; a rotatable and adjustable eccentric ring is rotatably installed at the second shaft hole of the motor plate, and the housing of the servo motor is embedded and snapped into the eccentric hole of the eccentric ring through clearance fit; The first shaft hole, the second shaft hole, and the eccentric hole of the eccentric ring together form the shaft system channel of the servo motor output shaft; the housing is provided with a viewing window for observing the meshing of the second gear and the first gear.

2. The four-axis rotary table gear meshing backlash adjustment device according to claim 1, characterized in that: The adjusting component is a stop screw, and the motor plate has multiple stop screw holes through it; The fastener is a first screw, and multiple first screw holes are provided through the motor plate. Multiple second screw holes are provided on the side plate corresponding to the multiple first screw holes.

3. The four-axis rotary table gear meshing backlash adjustment device according to claim 2, characterized in that: Multiple anti-slip screws are installed at the four corners of the motor plate.

4. The four-axis rotary table gear meshing backlash adjustment device according to claim 1, characterized in that: The motor plate has a coaxial annular groove around the second shaft hole, and the eccentric ring is fitted in the annular groove with clearance fit. The motor plate has a slot that communicates with the annular groove, and the bottom surface of the slot is parallel to the bottom surface of the annular groove; the bottom surface of the slot is provided with scale lines to indicate the rotational displacement of the eccentric ring. The outer ring wall of the eccentric ring has multiple insertion holes that are radially inwardly distributed along the circumference of the eccentric ring. A wrench is inserted into the insertion hole from the groove opening to drive the eccentric ring to rotate around the central axis of the annular groove.

5. The four-axis rotary table gear meshing backlash adjustment device according to claim 1, characterized in that: The housing of the servo motor is provided with an annular boss that matches the diameter of the eccentric hole.

6. The four-axis rotary table gear meshing backlash adjustment device according to claim 1, characterized in that: The motor board has multiple third screw holes, and the servo motor is provided with a mounting flange. The mounting flange has multiple through holes corresponding to the multiple third screw holes. The servo motor is fixed to the motor board by a second screw, and the diameter of the second screw is smaller than the diameter of the through hole.

7. The four-axis rotary table gear meshing backlash adjustment device according to claim 1, characterized in that: A first sealing ring is installed between the side plate and the motor plate, a second sealing ring is installed between the motor plate and the eccentric ring, and a third sealing ring is installed between the eccentric ring and the housing of the servo motor.

8. A four-axis rotary table gear meshing backlash adjustment device according to claim 7, characterized in that: The side plate has a first mounting groove for installing a first sealing ring in the part that is connected to the motor plate, the motor plate has a second mounting groove for installing a second sealing ring in the part that is connected to the eccentric ring, and the eccentric ring has a third mounting groove for installing a third sealing ring in the part that is connected to the servo motor housing.

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