CN210938389U

CN210938389U - High-precision indexer

Info

Publication number: CN210938389U
Application number: CN201921876158.XU
Authority: CN
Inventors: 杨朝辉
Original assignee: Luoyang Jingke Spindle Co ltd
Current assignee: Luoyang Jingke Spindle Co ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-07-07
Anticipated expiration: 2029-11-04

Abstract

A high-precision graduator comprises a steel ball indexing disc, wherein the steel ball indexing disc mainly comprises an upper disc body and a lower disc body; the lower disc body is fixed on the shell, an upper sliding sleeve is arranged at the axis of the lower disc body, a mandrel is connected in the upper sliding sleeve in a sliding manner, one end of the mandrel is connected with the upper disc body, and the other end of the mandrel is connected with an oil cylinder; the cylinder body of the oil cylinder is connected with the shell, one end of a piston rod of the oil cylinder is coaxially connected with the mandrel, the other end of the piston rod of the oil cylinder is connected with a clutch, and the clutch is connected with the stepping motor in a sliding mode. The rotating error of the stepping motor of the utility model is repaired and compensated by the steel ball dividing disc, so that the low-precision driving device can obtain high-precision positioning precision; and the step counting of the stepping motor is reset, so that the stepping motor has no accumulative error. The utility model discloses simple structure, compactness, with low costs, and degree of automation is high, has realized the application of steel ball graduated disk 1 in the practice.

Description

High-precision indexer

Technical Field

The utility model belongs to the technical field of the circle graduation technique and specifically relates to a high accuracy graduator is related to.

Background

The graduator is the most common circular dividing device, the precision of the graduator depends on the dividing precision, taking a cam graduator as an example, the cam graduator is a high-precision graduator, and the positioning precision of the cam graduator is positive and negative 30 seconds and can reach up to positive and negative 15 seconds. Patent No. 85101981.1 discloses an error automatic compensation steel ball indexing disc, which uses steel ball rollers of upper and lower disc bodies to perform angle positioning, the more the steel ball rollers are distributed, the higher the positioning precision, and the highest the positioning precision can reach plus or minus 3 seconds. Another advantage of the steel ball indexing disc is that no accumulated error exists, and the positioning times are independent of the positioning precision.

The steel ball indexing disc only discloses an angle positioning structure, and does not disclose an angle positioning driving device. Due to the structural characteristics and the working mode of the steel ball indexing disc, the requirement on the driving device for angular positioning is high, and the traditional driving device for angular positioning is difficult to meet the working requirement, so that the steel ball indexing disc is not put into practical application all the time.

SUMMERY OF THE UTILITY MODEL

In order to overcome not enough among the background art, the utility model discloses a high accuracy degree protractor, its aim at: the application of the steel ball indexing disc in practice is realized through a driving device for angular positioning.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:

a high-precision graduator comprises a steel ball indexing disc, wherein the steel ball indexing disc mainly comprises an upper disc body and a lower disc body; the lower disc body is fixed on the shell, an upper sliding sleeve is arranged at the axis of the lower disc body, a mandrel is connected in the upper sliding sleeve in a sliding manner, one end of the mandrel is connected with the upper disc body, and the other end of the mandrel is connected with an oil cylinder; the cylinder body of the oil cylinder is connected with the shell, one end of a piston rod of the oil cylinder is coaxially connected with the mandrel, the other end of the piston rod of the oil cylinder is connected with a clutch, and the clutch is connected with the stepping motor in a sliding mode.

In order to further improve the technical scheme, the shell is provided with an inner shaft shoulder, the mandrel is provided with an outer shaft shoulder, and a plurality of belleville springs and thrust bearings are arranged between the inner shaft shoulder and the outer shaft shoulder.

In order to further improve the technical scheme, the casing is equipped with the lower sliding sleeve towards the one end of hydro-cylinder, the dabber is towards the one end and the lower sliding sleeve sliding connection of hydro-cylinder.

In order to further improve the technical scheme, a base is arranged on the outer side of the shell and connected with the lower disc body.

In order to further improve the technical scheme, the clutch is an electromagnetic clutch, the stepping motor is connected with a speed reducer, and the stepping motor is connected with the clutch through the speed reducer.

In order to further improve the technical scheme, the clutch is fixedly connected to one end, far away from the mandrel, of the piston rod, an inner key groove is formed in a connecting hole of the clutch, a connecting key corresponding to the inner key groove is arranged on a speed reducing shaft of the speed reducer, and the clutch is in sliding connection with the speed reducing shaft of the speed reducer in a key fit mode.

In order to further improve the technical scheme, the clutch, the stepping motor and the oil cylinder are connected with the control device.

In order to further improve the technical scheme, an external thread is arranged at one end, connected with the mandrel, of the piston rod, an internal thread corresponding to the external thread is arranged on the mandrel, and the piston rod is in threaded connection with the mandrel.

Owing to adopt above-mentioned technical scheme, compare the background art, the utility model discloses following beneficial effect has:

the utility model discloses step motor's rotating error is maintained, is compensated by the steel ball graduated disk, makes the drive arrangement of low accuracy can obtain the positioning accuracy of high accuracy. Step motor's step-by-step count zero clearing makes step motor no longer have accumulative total error, and step motor pivoted positioning accuracy at every turn is a positioning accuracy, and holistic positioning accuracy depends on the positioning accuracy of steel ball graduated disk, consequently, the utility model discloses an accurate positioning has reached within 10 seconds high accuracy, does not have accumulative total positioning error moreover.

The utility model discloses simple structure, compactness, with low costs, and degree of automation is high, has realized the application of steel ball graduated disk 1 in the practice.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. a steel ball indexing disc; 1.1, an upper disc body; 1.2, a lower disc body; 1.3, an upper sliding sleeve; 2. a mandrel; 3. an oil cylinder; 4. a clutch; 5. a stepping motor; 6. a housing; 6.1, a lower sliding sleeve; 7. a belleville spring; 8. a thrust bearing; 9. a base.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the present invention has been described in connection with the drawings in the vertical position, this does not prevent the use of the present invention in other directions, and those skilled in the art can adjust the high precision protractor as needed to suit the specific application.

A high-precision graduator is shown in figure 1 and comprises a steel ball dividing disc 1, wherein the steel ball dividing disc 1 mainly comprises an upper disc body 1.1 and a lower disc body 1.2. Steel balls with equal diameters are tightly distributed in circular grooves of the upper tray body 1.1 and the lower tray body 1.2, and the steel ball dividing tray 1 is positioned by the staggered contact of the upper steel ball and the lower steel ball. For a specific structure, reference may be made to patent application No. 85101981.1, which will not be repeated herein. In this embodiment, the positioning accuracy of the steel ball index plate 1 is required to be ± 10 seconds. Specifically, 120 steel balls with the diameter of 8mm are respectively and tightly distributed in circular grooves of the upper disc body 1.1 and the lower disc body 1.2, and the included angle between the circle centers of two adjacent steel balls is 3 degrees. Therefore, the steel balls of the upper disc body 1.1 with the angle error within +/-1.5 degrees can fall between two adjacent steel balls of the lower disc body 1.2, the angle error is automatically compensated, and the accurate angle positioning is realized.

Lower disk body 1.2 is fixed on casing 6, is equipped with upper sliding sleeve 1.3 in lower disk body 1.2's axle center, and sliding connection has dabber 2 in upper sliding sleeve 1.3, and the lower extreme of casing 6 is equipped with lower sliding sleeve 6.1, the lower extreme and the lower sliding sleeve 6.1 sliding connection of dabber 2. The upper sliding sleeve 1.3 and the lower sliding sleeve 6.1 are copper sleeves, lubricating oil grooves are formed in the sleeves, and lubricating oil can be introduced to lubricate the core shaft 2. The mandrel 2 can slide along the axial direction of the upper sliding sleeve 1.3 and the lower sliding sleeve 6.1, and can also rotate in the upper sliding sleeve 1.3 and the lower sliding sleeve 6.1.

In order to ensure the contact force of the upper steel ball and the lower steel ball of the steel ball dividing plate 1, the shell 6 is provided with an inner shaft shoulder, the mandrel 2 is provided with an outer shaft shoulder, and a plurality of belleville springs 7 and thrust bearings 8 are arranged between the inner shaft shoulder and the outer shaft shoulder. The belleville springs 7 are arranged oppositely in pairs and used for enabling the mandrel 2 to generate downward thrust, the thrust bearing 8 is connected with the belleville springs 7 in series, and when the mandrel 2 rotates, the thrust bearing 8 is used for reducing the rotation resistance moment generated by the belleville springs 7 on the mandrel 2.

The upper end of the mandrel 2 is connected with the upper disc body 1.1 and used for enabling the upper disc body 1.1 to rotate, and the lower end of the mandrel is connected with the oil cylinder 3. The cylinder body of the oil cylinder 3 is connected with the lower end of the shell 6, the upper end of the piston rod is coaxially connected with the mandrel 2, and the other end of the piston rod is in sliding connection with the stepping motor 5 through the clutch 4. Specifically, the one end that the piston rod is connected with dabber 2 is equipped with the external screw thread, dabber 2 is equipped with the internal thread that corresponds with the external screw thread, the piston rod passes through threaded connection with dabber 2. Since the upper disc 1.1 may rotate reversely, in order to prevent the screw connection from loosening, screw glue is applied to the screw connection portion. The piston rod is connected with the mandrel 2 and is used for transmitting the torque of the stepping motor 5 and the push-pull force of the oil cylinder 3.

In order to realize the automation of the angle positioning, the clutch 4 is an electromagnetic clutch, and the clutch 4, the stepping motor 5 and the oil cylinder 3 are connected with a control device. The electromagnetic clutch is controlled by a control device to open and close and is used for cutting off and combining the connection between the piston rod and the stepping motor 5. The stepping motor 5 is connected with a speed reducer, and the stepping motor 5 is connected with the clutch 4 through the speed reducer. The speed reducer is used for improving torque and subdividing corners. The indexing accuracy of a common two-phase hybrid stepping motor is +/-3.6 degrees, the accuracy can reach +/-1.8 degrees with high accuracy, and the positioning accuracy requirement within +/-1.5 degrees is not met. The speed reduction ratio of the speed reducer is 1: 3, and the indexing precision of the stepping motor 5 is reduced to be within +/-1.2 degrees from +/-3.6 degrees after subdivision.

The clutch 4 is fixedly connected to the lower end of the piston rod, an inner key groove is formed in a connecting hole of the clutch 4, a connecting key corresponding to the inner key groove is arranged on a speed reducing shaft of the speed reducer, and when the clutch 4 moves up and down along with the piston rod, the clutch 4 is in sliding connection with the speed reducing shaft of the speed reducer through key matching. This makes it possible to fix the stepping motor 5 without being affected by the movement of the piston rod.

In order to facilitate protection and installation, a base 9 is arranged on the outer side of the shell 6, the upper end of the base 9 is connected with the lower disc 1.2, the lower end of the base 9 is used for being connected with a using device, and the stepping motor 5 is fixed in the base 9.

The working principle is as follows:

the rotational positioning accuracy of the stepping motor 5 is not high, and particularly the accumulated positioning error is large, but the cost of the stepping motor 5 is low and the control is easy. When the indexing positioning accuracy is high, the stepping motor 5 can subdivide the rotation positioning accuracy through the speed reducer, so that the upper disc body 1.1 can achieve the required rotation angle accuracy.

When the fixed angle positioning is needed, the piston rod moves upwards to compress the belleville spring 7, and the upper disc body 1.1 is lifted upwards. The stepping motor 5 rotates at a fixed angle under the control of the control device, when the stepping motor rotates to a specified angle, the control device controls the electromagnetic clutch to be opened, the connection between the piston rod and the stepping motor 5 is cut off, the piston rod moves downwards, the upper disc body 1.1 presses the lower disc body 1.2, and the steel balls on the upper disc body and the lower disc body are in staggered contact to realize positioning. Because the upper disc body 1.1 is separated from the connection with the stepping motor 5, the rotation error of the stepping motor 5 is repaired and compensated by the steel ball dividing disc 1. If the electromagnetic clutch does not cut off the connection between the piston rod and the stepping motor 5, the upper disc body 1.1 presses the positioning process of the lower disc body 1.2, so that the main shaft of the stepping motor 5 rotates, the positioning accuracy of the steel ball indexing disc 1 can be influenced by the rotation resistance, and the positioning accuracy of the stepping motor 5 can be influenced by the rotation angle.

When angular positioning is required again, the control device clears the step count of the stepping motor 5, and repeats the above actions. It can be seen that, the zero clearing of step motor 5 makes step motor 5 no longer have accumulative error, and step motor 5 pivoted positioning accuracy at every turn is a positioning accuracy, within 1.2 promptly, and holistic positioning accuracy depends on the positioning accuracy of steel ball graduated disk 1, consequently, the utility model discloses an accurate positioning has reached the high accuracy within 10 seconds, does not have accumulative positioning error moreover.

The part of the utility model not detailed is prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A high-precision indexer comprises a steel ball indexing disc (1), wherein the steel ball indexing disc (1) mainly comprises an upper disc body (1.1) and a lower disc body (1.2); the method is characterized in that: the lower disc body (1.2) is fixed on the shell (6), an upper sliding sleeve (1.3) is arranged at the axis of the lower disc body (1.2), a mandrel (2) is connected in the upper sliding sleeve (1.3) in a sliding manner, one end of the mandrel (2) is connected with the upper disc body (1.1), and the other end of the mandrel is connected with the oil cylinder (3); the cylinder body and the casing (6) of hydro-cylinder (3) are connected, and the one end and dabber (2) coaxial coupling of hydro-cylinder (3) piston rod, the other end is connected with clutch (4) and is connected, clutch (4) and step motor (5) sliding connection.

2. A high precision indexer according to claim 1 wherein: the shell (6) is provided with an inner shaft shoulder, the mandrel (2) is provided with an outer shaft shoulder, and a plurality of belleville springs (7) and thrust bearings (8) are arranged between the inner shaft shoulder and the outer shaft shoulder.

3. A high precision indexer according to claim 1 wherein: casing (6) are equipped with lower sliding sleeve (6.1) towards the one end of hydro-cylinder (3), dabber (2) towards the one end and lower sliding sleeve (6.1) sliding connection of hydro-cylinder (3).

4. A high precision indexer according to claim 1 wherein: the outer side of the shell (6) is provided with a base (9), and the base (9) is connected with the lower disc body (1.2).

5. A high precision indexer according to claim 1 wherein: the clutch (4) is an electromagnetic clutch, the stepping motor (5) is connected with a speed reducer, and the stepping motor (5) is in sliding connection with the clutch (4) through the speed reducer.

6. A high precision indexer according to claim 5 wherein: clutch (4) fixed connection is in the piston rod one end of keeping away from dabber (2), is equipped with interior keyway in the connecting hole of clutch (4), is equipped with the connecting key that corresponds with interior keyway on the speed reduction axle of speed reducer, and clutch (4) pass through key cooperation sliding connection with the speed reduction axle of speed reducer.

7. A high precision indexer according to claim 1 wherein: the clutch (4), the stepping motor (5) and the oil cylinder (3) are all connected with the control device.

8. A high precision indexer according to claim 1 wherein: the one end that the piston rod is connected with dabber (2) is equipped with the external screw thread, dabber (2) are equipped with the internal thread that corresponds with the external screw thread, the piston rod passes through threaded connection with dabber (2).