CN204679034U - The two-sided engagement pick-up unit of gravity self-adapting type non-circular gear error - Google Patents

Abstract

A gravity adaptive non-circular gear error double-sided meshing detection device includes a base, a non-circular gear loading platform and a cylindrical gear loading platform. The base and the non-circular gear loading platform are fixed, and the cylindrical gear loading platform moves along the guide bar as the meshing center distance of the two gear pairs changes. Using a stepping motor as the power input, the rotary motion is transmitted to the main shaft through the reduction of the worm gear. The movable seat is tightened by the rope with heavy objects guided by the guide wheel, so as to maintain the double-sided meshing state between the non-circular gear of the tested component and the cylindrical gear of the standard component, and the structure is simple, reliable and effective. During the detection process, the change of the center distance of the two gear pairs and the real-time rotation angle of the two gears can be measured and recorded by the grating sensor and the encoder respectively, which not only realizes the simultaneous detection of multiple parameters but also improves the detection efficiency.

Description

Gravity-adaptive non-circular gear error double-sided meshing detection device

technical field

The utility model belongs to the technical field of instrument measurement, in particular to a non-circular gear error double-sided meshing detection device.

Background technique

With the development of computer technology and the appearance of CNC machine tools, the design and processing of non-circular gears has become easier and easier, but there is little research on the error detection of non-circular gears, and there are very few detection devices for non-circular gears. , there is no detection device for non-circular gears to evaluate the error of non-circular gears, and it is impossible to evaluate the quality of non-circular gears. At the same time, the backwardness of non-circular gear measurement methods limits the mass production of non-circular gear mechanisms. Therefore, the development of non-circular gears The detection device is beneficial to promote the research and application of non-circular gears.

Domestic Tang Dewei proposed the detection method of single-sided meshing and double-sided meshing of non-circular gears. The principle is to use the variable center distance transmission scheme of standard gears and cylindrical gears meshing, and combine computer, grating measurement, and numerical control technology and control methods to realize the error. detected. Shi Zhaoyao of Beijing University of Technology invented the non-circular gear error single-sided meshing rolling point scanning measurement device to detect the relevant parameters of non-circular gears. The principle is based on the linkage between two motors to change the center distance to achieve the single-sided meshing state of the two gears. This design has high requirements on the control system. At the same time, the linkage motor will also produce errors, and the high cost is not easy to promote and use. The non-circular gear tooth profile total deviation measurement device invented by Tianjin University is based on the polar coordinate measurement method, and uses the measuring ball to directly measure the tooth profile. This method needs to calculate the characteristics of the sampling point before the measurement, and the wear of the measuring ball during the measurement will affect the measurement accuracy.

Contents of the invention

The purpose of the utility model is to provide a gravity adaptive non-circular gear error double-sided meshing detection device, which can realize the automatic detection of non-circular gears and greatly improve the detection efficiency of non-circular gears.

In order to achieve the above object, the technical solution adopted by the utility model is:

Includes base, non-circular gear loading platform and cylindrical gear loading platform. The base and the non-circular gear loading platform are fixed, and the cylindrical gear loading platform moves along the guide bar as the meshing center distance of the two gear pairs changes.

The base includes a rectangular housing, two guide rods, and a grating sensor. Two parallel guide rods are mounted on the base through screw connection; the linear bearing is mounted on the guide rod and can slide along the direction of the guide rod; the scale grating of the grating sensor is mounted on the base through screw connection.

The non-circular gear loading platform includes a fixed seat, a stepping motor, a motor bracket, a coupling, a worm bracket, a worm, a worm wheel, a first mandrel, a guide wheel, a weight, a rope, a small round nut, and a first encoder , the first encoder bracket. The motor bracket and worm bracket are mounted on the fixed seat through screw connection, the first encoder bracket is mounted on the worm bracket through screw connection, the stepper motor is installed on the motor bracket with screws, the motor shaft is connected with the coupling, and the coupling The other end is connected with the worm shaft. The worm is installed on the worm bracket, the motor shaft, coupling shaft and worm shaft are on the same axis, and the worm rotates synchronously with the motor. The first encoder is installed on the first encoder bracket by screws. The first mandrel is vertically installed on the fixed seat through a high-precision tapered roller bearing. Worm gear and non-circular gear are installed on the first mandrel, and are compressed with small round nuts, and the shaft of the first encoder is connected with the upper end of the first mandrel, and can rotate synchronously with the first mandrel. The worm drives the rotation of the non-circular gear and the first spindle through friction. The worm meshes with a worm gear mounted on the first spindle to transmit the motion. The guide wheels are installed on both sides of the fixed seat, and the end of the rope is connected with the weight and connected with the column gear loading platform via the guide wheels.

The cylindrical gear loading platform includes a standard cylindrical gear, a second spindle, a round nut, a second encoder, a bracket for the second encoder, and a moving seat. The second mandrel is vertically installed on the moving seat through a high-precision tapered roller bearing, and can rotate with the bearing with the vertical line as the axis. A standard spur gear is mounted on the shoulder of the second spindle and compressed with a round nut. The second encoder bracket is installed on the moving seat through screws, the second encoder is mounted on the second encoder bracket through screw connection, the shaft of the second encoder is connected with the upper end of the second mandrel, and can be connected with the second mandrel synchronous rotation. The reading head part of the grating sensor is installed on the side of the moving seat through screws. The fixed seat is installed on the base through screw connection, and the movable seat is installed on the linear bearing through screw connection, and can move along the guide rod. One end of the rope with heavy objects is tied to the moving seat and guided by the guide wheel installed on the fixed seat, and the driving seat is driven to move along the guide rod.

The beneficial effects of the utility model:

1. The utility model omits the complicated control drive, uses the stepper motor as the power input, and transmits the rotary motion to the main shaft through the deceleration of the worm gear. The structure is simple and reliable.

2. Use the rope with heavy objects guided by the guide wheel to tighten the movable seat, so as to maintain the double-sided meshing state between the non-circular gear of the measured component and the cylindrical gear of the standard component. The structure is simple, and the method is reliable and effective.

3. During the detection process, the change of the center distance when the two gear pairs mesh and the real-time rotation angle when the two gears mesh can be measured and recorded by the grating sensor and the encoder respectively, which not only realizes the simultaneous detection of multiple parameters but also improves the detection efficiency .

Description of drawings

Fig. 1 is a schematic isometric side view of the structure of the present utility model.

Figure 2 is a schematic front view of the structure of the utility model.

Fig. 3 is a schematic top view of the structure of the utility model.

Fig. 4 is a schematic left view of the structure of the utility model.

Fig. 5 is a top view schematic diagram of the connection and installation of the worm screw and the motor, and the meshing of the worm screw and the worm wheel of the present invention.

Fig. 6 is a schematic left view of the connection and installation of the worm screw and the motor of the present invention.

In the figure: Ⅰ. Base, Ⅱ. Non-circular gear loading platform, Ⅲ. Cylindrical gear loading platform, 1. Heavy object, 2. Rope, 3. Guide wheel, 4. Stepping motor, 5. Motor bracket, 6. Coupling, 7. Worm screw bracket, 8. Worm screw, 9. First encoder bracket, 10. First encoder, 11. Small round nut, 12. Non-circular gear, 13. Worm wheel, 14. Mandrel, 15 .Second encoder, 16. Round nut, 17. Second encoder bracket, 18. Standard cylindrical gear, as a standard component, 19. Second mandrel, 20. Guide rod, 21. Grating sensor, 22. Linear bearing .

Detailed ways

The specific embodiment of the utility model is described below in conjunction with accompanying drawing.

As shown in Figure 1-Figure 4, it includes base I, non-circular gear loading platform II and cylindrical gear loading platform III. The base I and the non-circular gear loading platform II are fixed, and the cylindrical gear loading platform III moves along the guide rod 20 as the meshing center distance of the two gear pairs changes.

The base I includes a rectangular aluminum alloy casting shell, two guide rods 20, and a grating sensor 21. Two parallel guide rods are mounted on the base I through screw connection; the linear bearing 22 is mounted on the guide rod 20 and can slide along the direction of the guide rod 20; the scale grating of the grating sensor 21 is mounted on the base I through screw connection.

Non-circular gear loading platform II includes fixed seat, stepping motor 4, motor bracket 5, coupling 6, worm bracket 7, worm 8, worm wheel 13, first spindle 14, guide wheel 3, weight 1, rope 2 , Small round nut 11, first encoder 10, first encoder bracket 9. As shown in Figure 5, the motor bracket 5 and the worm bracket 7 are mounted on the fixed seat through screw connection, the first encoder bracket 9 is installed on the worm bracket 7 through screw connection, and the stepping motor 4 is installed on the motor bracket 5 with screws , the motor shaft is connected with the coupling 6, and the other end of the coupling 6 is connected with the worm shaft. Worm screw 8 is installed on the worm screw support 7, and motor shaft, coupling shaft and worm screw shaft are on the same axis, and worm screw 8 rotates synchronously with motor. The first encoder 10 is installed on the first encoder bracket 9 by screws. The first mandrel 14 is vertically installed on the seat through a high-precision tapered roller bearing. Worm wheel 13 and non-circular gear 12 are installed on the first mandrel 14, and compress with small round nut 11, the shaft of first encoder 10 links to each other with the upper end of first mandrel 14, can rotate synchronously with first mandrel 14. The worm 8 drives the non-circular gear 12 and the first spindle 14 to rotate through friction. The worm 8 is engaged with a worm wheel 13 mounted on a first spindle 14 to transmit motion. The guide wheels 3 are installed on both sides of the fixed seat, and the ends of the rope 2 are connected with the weight 1 and connected with the cylindrical gear loading platform III via the guide wheels 3 . The transmission process realized in this part is: the rotary motion of the stepper motor main shaft is transmitted to the worm 8 through the coupling, and the rotary motion of the worm 8 is transmitted to the worm wheel 13 through meshing with the worm wheel 13 . The worm gear 13 drives the shafts of the first spindle 14 , the non-circular gear 12 and the first encoder 10 to rotate synchronously through frictional force. At the same time, the rotating non-circular gear 12 meshes with the standard cylindrical gear 18 to drive the standard cylindrical gear 18 to rotate.

The cylindrical gear loading platform III includes a standard cylindrical gear 18 , a second spindle 19 , a round nut 16 , a second encoder 15 , a second encoder bracket 17 , a moving seat, and a linear bearing 22 . The second mandrel 19 is vertically installed on the moving seat through a high-precision tapered roller bearing, and can rotate with the bearing taking the vertical line as the axis. Standard spur gear 18 is installed on the shaft shoulder of second mandrel 19 and compresses with round nut 16. The second encoder support 17 is installed on the movable seat by screws, and the second encoder 15 is installed on the second encoder support 17 by screw connection, and the shaft of the second encoder 10 is connected with the upper end of the second mandrel 19, which can be It rotates synchronously with the second spindle 19. The reading head part of the grating sensor 21 is installed on the side of the moving seat by screws. The fixed seat is installed on the base through screw connection, and the movable seat is installed on the linear bearing 22 through screw connection, and can move along the guide rod 20 . One end of the rope 2 hanging the weight 1 is tied to the moving seat and guided by the guide wheel installed on the fixed seat, and the driving seat is driven to move along the guide rod 20, so as to realize the meshing between the non-circular gear 12 and the standard cylindrical gear 18. A constant force keeps them in meshing contact, achieving the effect of double-sided meshing.

The working process of the present utility model is as follows:

The motor 4 is connected with the shaft coupling 6, and power is input to the worm 8 to realize the rotary motion of the worm. Worm screw 8 meshes with worm wheel 13 to drive worm wheel 13 to rotate, and worm wheel 13 drives the shaft of first mandrel 14, non-circular gear 12, small round nut 11 and first encoder 10 to do rotary motion with the vertical line as the axis. The first encoder 10 records the rotation angle information of the non-circular gear 12 in real time. The constant meshing force between the standard cylindrical gear 18 and the non-circular gear 12 is provided by the gravity of the weight 1 tied to the rope 2, so the non-circular gear 12 drives the standard cylindrical gear 18 to rotate for a full circle. The two gears of the gear pair are the standard cylindrical gear 18 and the non-circular gear 12 respectively, which are variable center distance transmission when meshing, and the grating sensor 20 is used to record the real-time variation of the center distance when the two gears mesh. The rotating standard cylindrical gear 18 drives the shafts of the second mandrel 19, the round nut 16 and the second encoder 15 to rotate synchronously, and the second encoder 15 records the real-time parameters of the rotation angle of the standard cylindrical gear 18. The first encoder 10 records the information of the rotation angle parameters of the non-circular gear 12, the second encoder 15 records the information of the standard cylindrical gear 18 rotation angle parameters, and the grating sensor 21 records the parameters of the center distance between the meshing two gears into the computer. Analyze transmission ratio function errors, pitch curve errors of non-circular gears and various errors of gears.

Claims (1)

1. A gravity adaptive type non-circular gear error double-sided meshing detection device is characterized in that: it includes a base (I), a non-circular gear loading platform (II) and a cylindrical gear loading platform (III); the base (I ) and the non-circular gear loading platform (II) are fixed, and the cylindrical gear loading platform (III) moves along the guide rod (20) as the meshing center distance of the two gear pairs changes; The base (I) includes a rectangular housing, two guide rods (20), and a grating sensor (21); two parallel guide rods (20) are mounted on the base (I) through screw connections; The linear bearing (22) is installed on the guide rod (20), and can slide along the direction of the guide rod (20); the scale grating of the grating sensor (21) is mounted on the base (I) through screw connection; The non-circular gear loading platform (II) includes a fixed seat, a stepping motor (4), a motor bracket (5), a coupling (6), a worm bracket (7), a worm (8), and a worm wheel (13) , the first mandrel (14), the guide wheel (3), the weight (1), the rope (2), the small round nut (11), the first encoder (10), the first encoder bracket (9); The motor bracket (5) and the worm bracket (7) are installed on the fixed seat through screw connection, the first encoder bracket (9) is installed on the worm bracket (7) through screw connection, and the stepper motor (4) is installed on the On the motor support (5), the motor shaft is connected with the coupling (6), and the other end of the coupling (6) is connected with the worm shaft; the worm (8) is installed on the worm support (7), and the motor shaft, coupling The worm shaft and the worm shaft are on the same axis, and the worm (8) rotates synchronously with the motor; the first encoder (10) is mounted on the first encoder bracket (9) through screws; the first mandrel (14) is passed through a high-precision The tapered roller bearing is installed vertically on the fixed seat; the worm wheel (13) and the non-circular gear (12) are installed on the first mandrel (14), and are compressed with a small round nut (11), and the first encoder (10) The shaft is connected with the upper end of the first mandrel (14), and can rotate synchronously with the first mandrel (14); the worm (8) drives the rotation of the non-circular gear (12) and the first mandrel (14) through friction The worm (8) is engaged with the worm wheel (13) installed on the first mandrel (14) to transmit motion; the guide wheel (3) is installed on both sides of the seat, and the end of the rope (2) is connected to the weight ( 1) Connected and connected to the cylindrical gear loading platform (Ⅲ) via the guide wheel (3); The cylindrical gear loading platform (Ⅲ) includes a standard cylindrical gear (18), a second mandrel (19), a round nut (16), a second encoder (15), a second encoder bracket (17), a moving seat, linear bearing (22); the second mandrel (19) is vertically installed on the moving seat through a high-precision tapered roller bearing, and can rotate with the bearing on the axis of the plumb line; the standard cylindrical gear (18) is installed on the On the shoulder of the second mandrel (19) and press it with a round nut (16); the second encoder bracket (17) is installed on the moving seat through screws, and the second encoder (15) is installed on the second shaft through screw connection. On the encoder bracket (17), the shaft of the second encoder (15) is connected to the upper end of the second mandrel (19), and can rotate synchronously with the second mandrel (19); the reading head part of the grating sensor (21) Installed on the side of the movable seat through screws; the fixed seat is installed on the base through screw connection, and the movable seat is installed on the linear bearing (22) through screw connection, and can move along the guide rod (20); hanging heavy objects ( 1) One end of the rope (2) is tied to the movable seat and guided by a guide wheel installed on the fixed seat, and the traction movable seat moves along the guide rod (20).