CN103673930B - Ultra-high-precision automated multi-tooth indexing table - Google Patents

Abstract

The invention relates to the technical field of geometric measurement measurement technology and instruments, and specifically discloses an ultra-high-precision automatic multi-tooth indexing table. In the indexing table, the lower end of the housing base is fixedly connected with the stepping motor, and the upper end of the housing base is fixedly connected with the fixed gear plate; a coaxial lifting cylinder is arranged inside the housing base, and a 26-bit photoelectric encoder, and the lead screw fixed on the shaft center of the lower end of the 26-bit photoelectric encoder is installed at the shaft center of the stepping motor, so that when the stepping motor goes up and down, it drives the lifting cylinder for lifting movement; the 26-bit photoelectric encoder The upper end is connected to the torque motor fixed on the upper end of the lifting cylinder through an elastic coupling, and the torque motor is connected to the spindle of the sprocket through a universal joint, and the spindle of the sprocket passes through the movable gear above the fixed sprocket and the fixed sprocket The disk is fixedly connected. With this indexing table, the standard deviation of angle measurement repeatability reaches 0.004"‑0.002", and the indexing limit difference from zero after compensation reaches ±0.03", which can realize ultra-high precision measurement.

Description

Ultra-high precision automatic multi-tooth indexing table

technical field

The invention belongs to the field of geometric measurement measurement technology and instrument technology, and in particular relates to an ultra-high-precision automatic multi-tooth indexing table.

Background technique

The multi-tooth indexing table is composed of a pair of plane centripetal end tooth discs with identical parameters such as diameter, number of teeth, and tooth shape, and a lifting and locking mechanism. After the two toothed discs mesh with each other, the indexing accuracy can be improved due to the average effect of multi-tooth meshing. Multi-tooth indexing table is a fixed-angle circular indexing equipment commonly used in metrology testing and finishing. Multi-tooth indexing technology has been extended to a variety of special testing equipment.

The first patent of the multi-tooth indexing table was obtained by the American A·A·GaGe company in 1960. By 1984, the indexing error of the multi-tooth indexing table at home and abroad had reached the limit error of ±0.1". After that, The improvement of accuracy has stagnated. So far, the highest level of domestic and foreign multi-tooth indexing tables is still the index limit error ±0.1". This is because it is difficult to achieve further improvement of indexing accuracy by mechanical technology. of.

During the working process of the multi-tooth indexing table, four basic actions such as "disengagement", "repositioning", "engagement" and "engagement force" must be realized. There are two methods of completion: "manual" and "automatic". , the "in place" of manual indexing is based on visual inspection, and a slight carelessness in the alignment of the scale will cause "tooth hitting" and damage the multi-tooth indexing table, while the automatic working method: it can be accurately rotated in place and taken Safeguards. For some special requirements, such as the inertial device test turntable, when the gear plate pair is used as the indexing element, in order to ensure the normal progress of the inertial device test, an automatic working method must be adopted. Another example is a rocket or an inertial navigation vehicle that uses inertial technology to self-seek north. When the "multi-position method" is used to improve the accuracy of north-finding, the multi-tooth indexing table is an accurate indexing device, but it must adopt an automated working method. At the same time, in order to prevent the airflow from causing the photoelectric autocollimator of the detection equipment to skip characters, a plexiglass cover is required, so the multi-tooth indexing table must be in an automatic working mode, which can also prevent the operator's body temperature from being transmitted to the multi-tooth indexing table due to manual operation. The degree table will destroy the temperature balance of the multi-tooth index table, thereby causing measurement errors.

Contents of the invention

The purpose of the present invention is to provide an ultra-high-precision automatic multi-tooth indexing table, which can improve the indexing accuracy and reduce the limit error of the zero-start indexing error from ±0.1" to ±0.03".

The technical scheme of the present invention is as follows: an ultra-high-precision automatic multi-tooth indexing table, the indexing table includes a movable toothed plate, a fixed toothed plate, a housing base and a stepping motor, wherein the lower end of the housing base is connected to the stepping motor. The input motor is fixedly connected, and the upper end of the housing base is fixedly connected with the fixed gear plate; a coaxial lifting cylinder is arranged inside the housing base, and a 26-bit photoelectric encoder is fixed at the bottom of the lifting cylinder, and is fixed on the 26-position The lead screw at the lower end of the photoelectric encoder is installed at the axis of the stepping motor, so that when the stepping motor rotates, the lead screw drives the lifting cylinder to move up and down; the upper end of the 26-bit photoelectric encoder is fixed on the The torque motor at the upper end of the lifting cylinder is connected, and the torque motor is connected with the toothed disc mandrel through a universal joint, and the toothed disc mandrel passes through the fixed toothed disc and is fixedly connected with the movable toothed disc above the fixed toothed disc.

The lifting tube is provided with two parallel upper magnets and lower magnets, and two parallel upper Hall switches and lower Hall switches are provided near the corresponding position of the housing base. When the upper magnet and the upper Hall switch are triggered, the movable toothed plate is completely disengaged from the fixed toothed plate; when the lower magnet is triggered by the lower Hall switch, the movable toothed plate is completely meshed with the fixed toothed plate.

A counterweight is fixed on the tooth disc mandrel below the fixed tooth disc, and a thrust bearing is installed between the lower end surface of the counterweight block and the upper end surface of the elevating cylinder.

Several linear guide rails are evenly installed along the circumference on the outer circular side wall of the lifting cylinder, and the sliders of the linear guide rails are fixed to the housing base so that the lifting cylinder can move up and down on the housing base along the linear guide rails. move.

3 linear guide rails are evenly installed along the circumference on the outer circular side wall of the lifting cylinder, and the sliders of the linear guide rails are fixed to the housing base so that the lifting cylinder can move up and down on the housing base along the linear guide rails. move.

The housing base is a cylindrical structure with several openings on the side wall.

The remarkable effect of the present invention lies in: the ultra-high-precision multi-tooth indexing table described in the present invention has the repeatability standard deviation of angle measurement up to 0.004"-0.002", and the limit difference of indexing from zero after compensation reaches ±0.03", which can Achieve ultra-high precision measurement.

Description of drawings

Fig. 1 is a kind of ultra-high-precision automatic multi-tooth indexing table structure schematic diagram of the present invention;

In the figure: 1. Movable gear plate; 2. Fixed gear plate; 3. Gear plate mandrel; 4. Universal coupling; 5. Thrust bearing; 6. Housing base; 7. Torque motor; 8. Linear guide rail; 9. Elastic coupling; 10. Lifting cylinder; 11. Lead screw; 12. Stepper motor; 13. 26-bit photoelectric encoder; 14. Lower magnet; 15. Lower Hall switch; 16. Upper magnet ; 17, Hall switch; 18, counterweight.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, an ultra-high-precision automatic multi-tooth indexing table includes a movable toothed plate 1, a fixed toothed plate 2, a housing base 6 and a stepping motor 12, wherein the side wall is a cylinder with several openings. The lower end of the cylindrical housing base 6 is fixedly connected with the stepper motor 12, and the inside of the housing base 6 is provided with a lifting cylinder 10 coaxial with the housing base 6, and the upper edge of the outer circular side wall of the lifting cylinder 10 Several, for example, three vertical linear guide rails 8 are evenly installed on the circumference, and the sliders of the linear guide rails 8 are fixed to the housing base 6, so that the lifting tube 10 can move along the linear guide rails 8 on the housing base 6. Move up and down; the mandrel of the stepping motor 12 is equipped with a lead screw 11, which can drive the lead screw 11 to move up and down. The upper end of the bit photoelectric encoder 13 is connected with the spindle of the torque motor 7 fixed on the upper end of the lifting cylinder 10 through the elastic coupling 9, and the spindle of the torque motor 7 is connected with the gear plate spindle 3 through the universal joint 4, The sprocket spindle 3 passes through the fixed sprocket 2 fixed on the upper end of the housing base 6, and is fixedly connected with the movable sprocket 1 above the fixed sprocket 2, wherein the sprocket spindle 3 below the fixed sprocket 2 A counterweight 18 is fixed on the top, and a thrust bearing 5 is installed between the lower end surface of the counterweight 18 and the upper end surface of the lifting cylinder 10; an upper magnet 16 and a lower magnet 14 are installed in parallel at the upper and lower positions of the lifting cylinder 10 , and the upper Hall switch 17 and the lower Hall switch 15 are installed in parallel near the corresponding position of the housing base 6, when the lower magnet 14 and the lower Hall switch 15 are triggered, the movable gear plate 1 and the fixed gear plate 2 are completely meshed ; When the upper magnet 16 and the upper Hall switch 15 are triggered, the movable toothed disc 1 and the fixed toothed disc 2 are completely disengaged.

The concrete work engineering of a kind of ultra-high-precision automatic multi-tooth indexing table of the present invention is: when the stepper motor 12 rotates in the forward direction, the lifting tube 10 is driven by the screw 11 to make a lifting movement, and when the lifting tube 10 rises to make When the upper magnet 16 and the upper Hall switch 17 are triggered, the movable toothed disc 1 and the fixed toothed disc 2 are completely disengaged, and the lifting motion stops; When the lifting cylinder 10 falls to the lower magnet 14 and the lower Hall switch 15 is triggered, the movable gear plate 1 and the fixed gear plate 2 are completely meshed, the stepping motor 12 stops and the power is cut off; the industrial computer communicates to the DC through the RS232 interface. The torque motor 7 sends the position control parameters of the movable sprocket 1, and the 26-bit photoelectric encoder 13 feeds back the angular position information of the movable sprocket 1 in real time, and drives the torque motor 7 to rotate to the designated position to ensure that the movable sprocket 1 and the fixed sprocket 2 mesh When the tooth top and the tooth groove are precisely aligned; the lower end surface of the counterweight 18 fixedly installed on the toothed mandrel 3 is a precision ground surface. The lower end surface of the block 18 is disengaged from the steel ball of the thrust bearing 5, and the weight of the counterweight block 18 is the meshing force added by the movable chainring 1.

Claims (6)

1. a kind of superhigh precision automatization multiteeth indexing table it is characterised in that: this circular dividing table includes active toothed disk (1), fixed tooth disk (2), housing base (6) and motor (12), wherein, housing base (6) lower end is fixedly connected with motor (12), shell Susceptor body (6) upper end is fixedly connected with fixed tooth disk (2)；It is provided with coaxial lifting tube (10) inside housing base (6), in lifting The bottom of cylinder (10) is fixed with 26 photoelectric encoders (13), and is fixed on the leading screw in 26 photoelectric encoder (13) lower end axle center (11) it is arranged at the axle center of motor (12), when so that motor (12) is rotated, leading screw (11) drives lifting tube (10) to make Elevating movement；Yielding coupling (9) and the power being fixed on lifting tube (10) upper end are passed through in the upper end of 26 photoelectric encoders (13) Torque motor (7) connects, and torque motor (7) is connected with fluted disc heart axle (3) by universal coupling (4), and fluted disc heart axle (3) passes through Fixed tooth disk (2) is fixedly connected with the active toothed disk (1) above fixed tooth disk (2).

2. a kind of superhigh precision automatization multiteeth indexing table according to claim 1 it is characterised in that: described lifting tube (10) it is provided with two upper magnets being parallel to each other (16) and lower magnet (14), and set near housing base (6) correspondence position Have two upper Hall switch (17) being parallel to each other and lower Hall switch (15), when lifting tube (10) rise make upper magnet (16) with During upper Hall switch (17) triggering, active toothed disk (1) and fixed tooth disk (2) drop out of gear completely；When lower magnet (14) and lower Hall switch (15), when triggering, make active toothed disk (1) at a fully engaged with fixed tooth disk (2).

3. a kind of superhigh precision automatization multiteeth indexing table according to claim 1 it is characterised in that: described fixed tooth disk (2) balancing weight (18) is fixed with fluted disc heart axle (3) below, and the lower surface in balancing weight (18) and lifting tube (10) is upper Thrust bearing (5) is installed between end face.

4. a kind of superhigh precision automatization multiteeth indexing table according to claim 1 it is characterised in that: described lifting tube (10) several line slideways (8) are circumferentially uniformly provided with cylindrical side wall, and make slide block and the housing of line slideway (8) Pedestal (6) is fixing, so that lifting tube (10) can be able to be moved up and down on housing base (6) along line slideway (8).

5. a kind of superhigh precision automatization multiteeth indexing table according to claim 4 it is characterised in that: described lifting tube (10) 3 line slideways (8) are circumferentially uniformly provided with cylindrical side wall, and make slide block and the housing base of line slideway (8) Seat (6) is fixing, so that lifting tube (10) can be able to be moved up and down along line slideway (8) in housing base (6).

6. any one superhigh precision automatization multiteeth indexing table according to claims 1 to 5 it is characterised in that: described Housing base (6) have the cylindrical structure of some openings for side wall.