WO2022255726A1

WO2022255726A1 - Curved holder and linear motion apparatus comprising same

Info

Publication number: WO2022255726A1
Application number: PCT/KR2022/007478
Authority: WO
Inventors: 이종기
Original assignee: 이종기
Priority date: 2021-06-03
Filing date: 2022-05-26
Publication date: 2022-12-08
Also published as: KR102359366B1

Abstract

The present invention relates to a curved holder and a linear motion apparatus comprising same, and comprises: a transport main body which has an arrangement hole penetrating therethrough, wherein the arrangement hole accommodates a ball nut having both ends that are symmetrical with each other in the lengthwise direction and having a screw penetrating therethrough, and which can be coupled to a guide block connected to a rail; and a plurality of fastening means fastened with the ball nut while passing through the transport main body.

Description

Curved surface holder and linear motion device including the same

The present invention relates to a curved surface holder and a linear motion device including the same.

The lead ball screw is one of the devices that change the direction of motion and is widely used for position control in various automation facilities in connection with motors. The lead ball screw includes a long rod-shaped screw formed on an outer circumference and a ball nut coupled to the screw.

One end of the screw is supported on the fixed end and connected to the motor, and the other end is rotatably coupled to the support end. The ball nut is connected to the table on which the material to be transported is placed, and when the screw is rotated by the motor, the ball nut moves along the length of the screw.

As shown in FIGS. 7 and 8, the conventional ball nut 8 is coupled to a bracket B installed on a table T connected to a rail 2 by a block 3. The ball nut 8 has a screw hole h through which the screw 4 passes through the inner center, and is formed on the outer circumference of one side of the nut body 8a and the nut body 8a passing through the bracket B, Includes a flange (8b) in contact with one side of the bracket (B). The ball nut 8 is fixed to the bracket B by means of coupling 8c. The coupling means (8c) is fastened to the bracket (B) through the flange (8b).

Since the flange (8b) is biased around the outer circumference of one side of the nut body (8a), one side of the nut body (8a) is fixed to one side of the bracket (B), causing imbalance when the ball nut (8) moves in both directions. can In addition, the center of the longitudinal direction of the screw hole (h) and the center of the longitudinal direction of the screw (4) must be parallel to precisely control the position of the table (T), but the bracket (B) is installed vertically on the table (T), As the ball nut (8) is coupled to the bracket (B), it is difficult to maintain parallelism between the longitudinal center of the screw hole (h) and the longitudinal center of the screw (4) due to the installation structure.

The present invention provides a technique in which both ends in the longitudinal direction of a ball nut through which a screw passes are symmetrical to maintain balance when the ball nut moves in both directions.

The curved surface holder according to one embodiment of the present invention is symmetrical on both sides in the longitudinal direction and has a placement hole through which a ball nut through which a screw is accommodated along the longitudinal direction and is coupled to a guide block connected to a rail. A transfer body, And it includes a plurality of fastening means fastened to the ball nut through the transfer body.

A contact portion between the ball nut and the transfer body is formed in a curved surface, and the fastening means is arranged along the longitudinal direction of the ball nut.

The arrangement hole is open in one side, the other side, and the lower surface direction of the transfer body, and a portion of the outer circumference of the ball nut is exposed to the outside of the transfer body through the open lower surface, and both sides of the ball nut in the longitudinal direction are It may not be exposed to the outside of the transfer body.

The outer circumferential diameter of the ball nut may be formed identically as a whole without changing.

The ball nut may include a body portion and extension portions protruding from both ends of the body portion.

A plurality of fastening grooves into which the fastening means are fastened are formed at intervals along the longitudinal direction and the circumferential direction of the main body, and the fastening means arranged with the plurality of fastening grooves is a virtual center line perpendicular to the center of the longitudinal direction of the main body. Symmetry can be achieved based on .

The transfer body is coupled to the ball nut at one side based on the center of the longitudinal direction of the ball nut and is connected to a guide block moving along the rail to support the ball nut, and a first support block capable of supporting the ball nut in the longitudinal direction. It is coupled to the ball nut on the other side based on the center and is connected to a guide block moving along the rail to include a second support block capable of supporting the ball nut.

The fastening means may include a first fastening part fastened to the outer circumference of the ball nut through the first support block, and a second fastening part fastened to the outer circumference of the ball nut through the second support block. can

Portions of the first support block and the second support block in contact with the ball nut form the arrangement hole, and the first fastening part and the second fastening part may coincide with the center of rotation of the screw.

A linear motion device according to an embodiment of the present invention is a curved surface holder described above, a base, a ball nut coupled to the curved surface holder, a screw passing through a screw hole of the ball nut, a drive motor connected to one end of the screw, A fixed end for rotatably supporting one end of the screw, a support end for rotatably supporting the other end of the screw, and a plurality of ends installed along the length of the base and disposed on both sides in the width direction and to which the guide block is coupled. includes rails

According to an embodiment of the present invention, the outer circumference of the ball nut and the circumference of the arranging hole of the transfer body are formed as curved surfaces, contact each other, and the center coincides with the rotation center of the screw. In addition, both ends of the ball nut in the longitudinal direction are symmetrical in the arrangement hole. As a result, the ball nut is not biased in the transfer body, so the ball nut can maintain balance when moving in both directions by the screw. Accordingly, it is possible to precisely control the transfer of the transfer body.

According to an embodiment of the present invention, both ends of the ball nut in the longitudinal direction are stably coupled to the first support block and the second support block by the first fastening member and the second fastening member. In addition, since the center of the first curved portion and the second curved portion coincide with the center of rotation of the screw, the center of the screw hole of the ball nut and the center of rotation of the shaft coincide with each other to maintain parallelism. Accordingly, the positions of the ball nut and the transfer body can be precisely controlled.

According to an embodiment of the present invention, since the flange is not formed on one side of the ball nut and only the locking jaw is formed on the outer circumference, raw materials and cutting costs can be reduced. As a result, there is an effect of lowering the cost of the linear motion device.

1 is a perspective view showing a linear motion device according to an embodiment of the present invention.

2 is an exploded view of the ball nut and the curved mount of FIG. 1;

Figure 3 is a cross-sectional view of the ball nut and the curved holder of Figure 1 taken along the line Ⅲ-Ⅲ.

4 is a cross-sectional view of FIG. 1 taken along line VI-VI;

5 is an exploded view showing another embodiment of the curved mount of FIG. 2;

Figure 6 is a front view shown in the assembled state of the curved holder of Figure 5;

7 is a side view showing a conventional ball nut installation state;

Figure 8 is a front view of Figure 7;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Like reference numerals have been assigned to like parts throughout the specification.

The curved surface holder according to the embodiment of the present invention can be applied to the linear motion device according to the embodiment of the present invention, and hereinafter, the linear motion device to which the curved surface holder is applied will be mainly described.

Then, a linear motion device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

1 is a perspective view showing a linear motion device according to an embodiment of the present invention, FIG. 2 is an exploded view of the ball nut and the curved mount of FIG. 1, and FIG. 3 is the ball nut and the curved mount of FIG. 4 is a cross-sectional view of FIG. 1 taken along line VI-VI.

1 to 4, the linear motion device 100 according to this embodiment includes a base 10,

rails

20a and 20b,

guide blocks

30a and 30b, ball nuts 80, and screws 40 ), a drive motor 50, a fixed end 60, a support end 70 and a curved surface holder 90.

The base 10 has a preset length and width. When the linear motion device 1 is a processing device, the base 10 may be a body of the processing device.

The

rails

20a and 20b are formed as a pair and are disposed at intervals in the width direction Y on the upper surface of the base 10 and installed along the longitudinal direction X. The

rails

20a and 20b may be LM guides.

The guide blocks 30a and 30b are formed in pairs and disposed on the pair of

rails

20a and 20b, respectively. Guide block (30a, 30b) can move along the rail (20a, 20b). The guide blocks 30a and 30b may be LM blocks.

The screw 40 is located between the pair of

rails

20a and 20b, and a screw groove is formed around the outer periphery.

The drive motor 50 is power-connected to one end of the screw 40. The screw 40 may be rotated by the power of the driving motor 50 .

The fixed end 60 is disposed on one end of the base 10 and supports one end of the screw 40 rotatably.

The support end 70 is disposed on the other end of the base 10 and supports the other end of the screw 40 rotatably.

The detailed configuration of the base 10, the

rails

20a and 20b, the guide blocks 30a and 30b, the screw 40, the drive motor 50, the fixed end 60 and the support end 70 is described in this section. A fixing device for both ends of a known ching lead ball screw, a motor shaft connecting device and a linear motion device including the same (Patent Registration No. 10-1648808), a center matching device and a linear motion device including the same (Patent Registration No. 10-2052981) may be applied, and detailed description thereof will be omitted.

The curved surface holder 90 includes a transfer body 91 to which the ball nut 80 is coupled and a fastening means 92.

The ball nut 80 is coupled to the screw 40 and is positioned between a pair of

guide blocks

30a and 30b. A screw hole 83 passes through the center of the ball nut 80 along the longitudinal direction. The screw 40 passes through the screw hole 83 . Steel balls (not shown) are arranged inside the ball nut 80 to move along the screw groove.

The ball nut 80 includes a body portion 81 and

extension portions

82a and 82b, and can linearly move along the longitudinal direction of the screw 40 when the screw 40 rotates with the support of the curved surface holder 90. .

The body portion 81 has a predetermined length and has a circular outer circumference. A plurality of fastening grooves 84 are formed along the outer circumference of the body portion 81 at intervals along the longitudinal direction and the circumferential direction. In the drawing, it is shown that two fastening grooves 84 are formed along the longitudinal direction on both sides of the body portion 82, but the number of fastening grooves 84 may vary depending on the standard of the ball nut 80.

The longitudinal center 84c of the fastening groove 84 is perpendicular to and coincides with the rotational center 41 of the screw 40. The plurality of fastening grooves 84 are symmetrical with respect to a virtual center C perpendicular to the center of rotation 41 of the screw 40 when the body portion 81 is viewed in a plan view. Here, the imaginary center (C) is arranged along the longitudinal direction of the body portion 81 and is located between adjacent fastening grooves 84.

The

extension portions

82a and 82b protrude along the longitudinal direction of the screw 40 from both ends of the body portion 81 . The

extension portions

82a and 82b protrude from both ends of the body portion 81 with the same length. Thus, the ball nut 80 is symmetrical on both sides in the longitudinal direction based on the imaginary center (C) perpendicular to the longitudinal direction of the body portion 81 when viewed from a plane.

The

extension portions

82a and 82b are integrally formed with the body portion 81 and have a circular outer circumference. The outer circumferential diameter of the

extension portions

82a and 82b is smaller than the outer circumferential diameter of the body portion 81 . Accordingly, locking protrusions 85 are formed at both ends of the body portion 81 due to a difference in diameter between the

extension portions

82a and 82b and the body portion 81 . The difference in diameter may be 2.5 mm to 4.5 mm. When the difference in diameter is less than 2.5 mm, the binding force with the curved holder 90 may decrease, and when the difference in diameter is greater than 4.5 mm, the amount of cutting of the material may increase, resulting in an increase in manufacturing cost.

Since the flange is not formed on one side of the ball nut 80 and only the locking jaw 85 is formed on the outer circumference, raw materials and cutting costs can be reduced. As a result, there is an effect of lowering the cost of the linear motion device.

The transfer body 91 includes a first support block 91a and a second support block 92a.

The first support block 91a is disposed on the upper surface of the guide block 30a on one side, and the second support block 92a is disposed on the upper surface of the guide block 30b on the other side. The first support block 91a and the second support block 92a face each other with the ball nut 80 interposed therebetween. The length of the first support block (91a) and the second support block (92a) is longer than the length of the ball nut (80). Accordingly, the ball nut 80 does not deviate from the first support block 91a and the second support block 92a.

The first support block 91a and the second support block 92a are coupled to the guide blocks 30a and 30b by block coupling means 93a and 93b. The block coupling means (93a, 93b) is fastened to the guide blocks (30a, 30b) through the inside of the first support block (91a) and the second support block (92a) from the upper surface.

The inner surface of the first support block 91a and the second support block 92a facing each other is in contact with the outer circumference of the ball nut 80. The inner surfaces of the first support block 91a and the second support block 92a are formed as curved surfaces. The curved surface forms an arrangement hole in contact with the first support block 91a and the second support block 92a. The center of the curved surface (arrangement hole) coincides with the center of rotation 41 of the screw 40.

The inner surfaces of the first support block 91a and the second support block 92a are first

curved portions

911a and 921a in contact with the body portion 81 and second curved portions in contact with the

extension portions

82a and 82b. It consists of (911b, 921b). Between the first

curved portions

911a and 921a and the second

curved portions

911b and 921b,

step portions

94a and 94b to which the hooking step 85 is caught are formed due to a difference in diameter.

The first support block 91a and the second support block 92a are antisymmetric. Accordingly, the second curved portion 911b of the first support block 91a is in contact with one extension portion 82a, and the second curved portion 921b of the second support block 92a is in contact with the other extension portion 82b. have.

The fastening means 92 includes a first fastening member 91b and a second fastening member 92b.

The first fastening member 91b and the second fastening member 92b are arranged along the longitudinal direction of the first support block 91a, the second support block 92a and the ball nut 80 to rotate the screw 40. It is located perpendicular to the center. Both sides of the first fastening member 91b and the second fastening member 92b are symmetrical with respect to an imaginary center perpendicular to the center of the longitudinal direction of the ball nut 80, respectively, to maintain balance.

The first fastening member 91b is fastened to one side fastening groove 84 of the ball nut 80 by penetrating the first support block 91a on the outer surface of the first support block 91a. And the second fastening member (92b) is fastened to the other fastening groove 84 of the ball nut 80 through the second support block (92a) on the outer surface of the second support block (92a).

While the ball nut 80 connected to the screw 40 is connected to the

rails

20a and 20b through the first support block 91a, the second support block 92a and the guide blocks 30a and 30b, the transfer body 91 ) may linearly move along the longitudinal direction of the

rails

20a and 20b without rotating along the screw 40 when the screw 40 rotates.

Meanwhile, a table (not shown) may be coupled to the first support block 91a and the second support block 92a.

The centers of the first

curved portions

911a and 921a and the second

curved portions

911b and 921b coincide with the center of rotation 41 of the screw 40 . When the ball nut 80 is combined with the curved surface holder 90, the center of the screw hole 83 of the ball nut 80 coincides with the center of rotation 41 of the screw 40. Accordingly, it is easy to set the center of the ball nut 80 and the screw 40. By matching the center of rotation of the ball nut 80 and the screw 40, the table of the linear motion device can be precisely controlled.

In addition, both ends of the ball nut 80 in the longitudinal direction are stably coupled to the first support block 91a and the second support block 92a by the first fastening member 91b and the second fastening member 92b. Accordingly, the center of the ball nut 80 can remain parallel to the center of rotation of the screw 40, and the position of the ball nut 80 can be precisely controlled.

Next, another embodiment of the curved mount will be described with reference to FIGS. 5 and 6 .

5 is an exploded view showing another embodiment of the curved mount of FIG. 2, and FIG. 6 is a front view of the curved mount of FIG. 5 in an assembled state.

5 and 6, the curved surface holder 90a according to the present embodiment includes a transfer body 91 to which a ball nut 80a is coupled and a fastening means 92.

In the ball nut 80a, the screw 40 penetrates the inside along the longitudinal direction. The outer circumferential diameter dimension of the ball nut 80a is not changed. Therefore, the outer circumference of the ball nut 80a is formed with the same diameter from one end to the other end in the longitudinal direction, so that no steps or flanges are formed on the outer circumference of the ball nut 80a.

Guide blocks 30a and 30b combined with rails are connected to both sides in the width direction from the lower surface of the transfer body 91 . A table (not shown) on which a material to be transported may be placed may be coupled to the upper surface of the transfer body 91 .

An arrangement hole 91c is formed in the center of the transfer body 91 . Arrangement hole 91c is formed along the longitudinal direction of the transfer body 91. The center of the placement hole 91c coincides with the center of rotation of the screw 40 .

The circumferential diameter of the arrangement hole 91c is formed to the same diameter without change from one side of the transfer body 91 to the other side. The arrangement hole 91c is open to one side, the other side, and the lower surface of the transfer body 91.

The ball nut 80a is accommodated in the arranging hole 91c, and the outer circumference of the ball nut 80a is in contact with the circumference of the arranging hole 91c, and the circumference is formed in a curved surface.

A part of the ball nut 80a is exposed to the outside of the transfer body 91 through the lower surface opened in the disposition hole 91c. However, one end and the other end in the longitudinal direction of the ball nut 80a are not exposed to the outside of one side and the other side of the transfer body 91.

In the above description and drawing 5, the ball nut 81a is made of one member and accommodated in the arrangement hole 91c. However, the ball nut 81a is divided into a plurality of members and can be sequentially accommodated in the arranging hole 91c. Both sides of the accommodated ball nuts 81a are symmetrically arranged in the center of the longitudinal direction of the transfer body 91 to maintain balance without being biased. The number of accommodated ball nuts 81a may vary depending on the length of the transfer body 91.

The fastening means 92 is fastened to the fastening groove 84 of the ball nut 80a through the transfer body 91 at the portion of the transfer body 91 coinciding with the rotational center of the screw 40. The fastening means 92 and the fastening groove 84 are formed in plurality at intervals along the longitudinal direction of the ball nut 80a. Screws are formed in the fastening means 92 and the fastening groove 84.

Both sides of the plurality of fastening means 92 and the fastening groove 84 are symmetrical with respect to an imaginary center line perpendicular to the center of the longitudinal direction of the ball nut 80a. Accordingly, since the ball nut 80a is not biased in the transfer body 91, the ball nut can maintain balance when moving in both directions by the screw. This has the effect of precisely controlling the transfer of the transfer main body.

Since the transfer body 91 is made of one member and coupled to the ball nut 80a, the components of the curved surface holder 90a are minimized and assembly is easy. This has the effect of improving the assembly workability of the operator.

For other configurations, the configurations of the embodiments of FIGS. 1 to 4 may be applied as they are.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also made according to the present invention. falls within the scope of the rights of

Claims

A transfer body that is symmetrical on both sides in the longitudinal direction and has a placement hole through which a ball nut through which a screw is accommodated is penetrated along the length direction and can be combined with a guide block connected to a rail, and

A plurality of fastening means fastened to the ball nut through the transfer body

contains

The part where the ball nut and the transfer body come into contact is formed in a curved surface, and the fastening means are arranged along the longitudinal direction of the ball nut

curved stand.
In paragraph 1,

The arrangement hole is open in one side, the other side, and the lower surface direction of the transfer body, and a portion of the outer circumference of the ball nut is exposed to the outside of the transfer body through the open lower surface, and both sides of the ball nut in the longitudinal direction are A curved surface holder that is not exposed to the outside of the transfer body.
In paragraph 1,

The outer circumferential diameter of the ball nut is not changed and is formed identically as a whole.
In paragraph 1,

The ball nut is

body part, and

Extensions protruding from both ends of the main body

Including,

A plurality of fastening grooves into which the fastening means are fastened are formed at intervals along the longitudinal direction and the circumferential direction of the main body, and the fastening means arranged with the plurality of fastening grooves is a virtual center line perpendicular to the center of the longitudinal direction of the main body. symmetrical about

curved stand.
In paragraph 1,

The transfer body

A first support block coupled to the ball nut on one side based on the center of the longitudinal direction of the ball nut and connected to a guide block moving along the rail to support the ball nut, and

A second support block coupled to the ball nut on the other side based on the longitudinal center and connected to a guide block moving along the rail to support the ball nut

containing

curved stand.
In paragraph 5,

The fastening means

A first fastening part fastened to the outer circumference of the ball nut through the first support block, and

A second fastening part fastened to the outer circumference of the ball nut through the second support block

including,

Portions of the first support block and the second support block in contact with the ball nut form the arrangement hole, and the first fastening part and the second fastening part coincide with the center of rotation of the screw.

curved stand.
A curved surface holder defined in any one selected from claims 1 to 6,

Base,

A ball nut coupled to the curved mount,

A screw penetrating the threaded hole of the ball nut,

A drive motor connected to one end of the screw by power;

A fixed end for rotatably supporting one end of the screw,

A support end for rotatably supporting the other end of the screw, and

A plurality of rails installed along the longitudinal direction of the base, disposed on both sides in the width direction, and to which the guide block is coupled.

A linear motion device comprising a.