Expanding sleeve annular support system for horizontal arm of three-dimensional coordinate measuring machine

Abstract

The present invention discloses an expansion sleeve type annular support system for the horizontal arm of a three-dimensional coordinate measuring machine, which belongs to an internal support device of a telescopic arm, and includes a support unit, wherein the support unit includes an expansion sleeve body and a support seat, wherein the expansion sleeve body has an internal thread, and the edge of the expansion sleeve body has a plurality of annularly arranged support plates in the axial direction; the support seat has an external thread matching the internal thread, and the support seat is also provided with an annular inclined surface inclined radially outward; during the relative axial movement of the expansion sleeve body and the support seat, the annular inclined surface gradually pushes the support plate to expand outward along the radial direction of the expansion sleeve body, thereby forming annular support for the inner wall of the horizontal arm of the three-dimensional coordinate measuring machine. The expansion sleeve body and the support seat are mutually squeezed to cause the plurality of annularly arranged support plates to expand outward, thereby forming annular support for the inner cavity of the horizontal arm. After arranging a plurality of support units according to the length of the horizontal arm and other conditions, the deflection of the telescopic horizontal arm can be reduced, and through the toughness of the support plate itself, it has a certain vibration reduction effect after being supported by the inner cavity of the horizontal arm.

Description

Technical Field

[0001] The present invention relates to an inner supporting device of a telescopic arm, and more specifically, mainly relates to an expansion sleeve type annular supporting system of a horizontal arm of a three-coordinate measuring machine. Background Art

[0002] During the extension and retraction process of the horizontal arm of the three-dimensional coordinate measuring machine, the deflection of the horizontal arm is easily changed due to the influence of its own gravity, thereby affecting the measurement accuracy of the three-dimensional coordinate measuring machine. In the prior art, the deflection of the aforementioned horizontal arm is generally reduced by adding a core rod auxiliary support in the middle of the hollow horizontal arm, or by using a four-corner steel wire lifting method to prevent the deflection of the horizontal arm from changing during the extension and retraction process. Among them, the core rod method inside the horizontal arm does not have a vibration reduction effect, and the overall rigid support cannot improve the dynamic change of the deflection of the horizontal arm. The steel wire lifting method is not only complex in structure, but also cannot achieve the purpose of lifting when facing a horizontal arm with a thick wall. It still cannot improve the problem of the change of the deflection of the horizontal arm during the extension and retraction process, and it cannot improve the vibration problem during the extension and retraction operation of the horizontal arm. Therefore, it is necessary to study and improve the support structure of the horizontal arm of the three-dimensional coordinate measuring machine. Summary of the invention

[0003] One of the purposes of the present invention is to solve the above-mentioned shortcomings and to provide an expansion sleeve type annular support system for the horizontal arm of a three-coordinate measuring machine, in the hope of solving the technical problems in the prior art that the deflection of the three-coordinate horizontal arm is easily changed during the extension and retraction process, thereby affecting the measurement accuracy of the three-coordinate measuring machine.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0005] The present invention provides an expansion sleeve type annular support system for the horizontal arm of a three-dimensional coordinate measuring machine, comprising a support unit, wherein the support unit comprises an expansion sleeve body and a support seat, wherein the expansion sleeve body has an internal thread, and the axial direction of the edge of the expansion sleeve body has a plurality of annularly arranged support plates; the support seat has an external thread matching the internal thread, and the support seat is also provided with an annular inclined surface inclined radially outward; the annular inclined surface is used to gradually push the support plate to expand radially outward along the expansion sleeve body during the axial relative movement of the expansion sleeve body and the support seat, thereby forming annular support for the inner wall of the horizontal arm of the three-dimensional coordinate measuring machine.

[0006] Preferably, a further technical solution is that the longitudinal section of the support seat is annular T-shaped, and both the support seat and the expansion sleeve body have threading channels inside.

[0007] A further technical solution is that the cross-sections of the expansion sleeve and the support seat at any position are circular.

[0008] A further technical solution is that the support plates are all rectangular in shape, and the lengths and widths of the multiple support plates are equal.

[0009] A further technical solution is that a plurality of support units are arranged in the inner cavity of the horizontal arm of the three-dimensional coordinate measuring machine at preset intervals, which are similar to the structure of bamboo joints, so as to support the horizontal arm of the three-dimensional coordinate measuring machine and prevent it from bending during the extension and retraction process, that is, reduce the deflection.

[0010] A further technical solution is that the horizontal arm of the three-dimensional coordinate measuring machine is a telescopic arm with a hollow inner cavity.

[0011] Compared with the prior art, one of the beneficial effects of the present invention is that the thrust force of the relative movement of the expansion sleeve and the support seat causes the multiple support plates arranged circumferentially to expand outward, thereby forming annular support for the inner cavity of the horizontal arm. After arranging multiple support units according to the length of the horizontal arm and other conditions, the deflection of the horizontal arm can be reduced, and through the toughness of the support plate itself, it has a certain vibration reduction effect after supporting the inner cavity of the horizontal arm. At the same time, the expansion sleeve type annular support system for the horizontal arm of a three-dimensional coordinate measuring machine provided by the present invention has a simple structure, is suitable for playing an internal support role in various types of horizontal arms, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram for describing an embodiment of the present invention.

[0013] Figure 2 for Figure 1 Schematic diagram of the longitudinal section.

[0014] Figure 3 The figure is a schematic diagram of the installation state for describing an embodiment of the present invention.

[0015] Figure 4 for Figure 3 Schematic diagram of the longitudinal section.

[0016] In the figure, 1 is a support unit, 11 is an expansion sleeve, 12 is a support seat, 13 is a support plate, 14 is an annular inclined surface, and 2 is a horizontal arm of a three-dimensional coordinate measuring machine. DETAILED DESCRIPTION

[0017] The inventors found that the deflection of the horizontal arm of the three-dimensional coordinate measuring machine is prone to change during the extension and retraction process due to the influence of gravity, and the change in deflection will fluctuate with the extension and retraction state of the horizontal arm, so it is difficult to correct it through the later computer program. The aforementioned horizontal arm refers to a hollow telescopic arm that performs telescopic movement on a given plane; the deflection is the linear displacement of the axis of the rod in a direction perpendicular to the axis when subjected to force or non-uniform temperature changes. The most effective way to reduce the aforementioned deflection is still to provide internal support for the horizontal arm so that it does not displace as much as possible during the extension and retraction process.

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] refer to Figure 1 and Figure 2 As shown, one embodiment of the present invention is an expansion sleeve type circumferential support system for a horizontal arm of a three-dimensional coordinate measuring machine. The horizontal arm 2 of the three-dimensional coordinate measuring machine referred to in this embodiment is a telescopic arm with a hollow inner cavity, and the support system is composed of a plurality of support units 1. The aforementioned support unit 1 is a combined structure, which includes an expansion sleeve body 11 and a support seat 12 that cooperate with each other through threads, wherein the expansion sleeve body 11 has an internal thread, and the axial direction of the edge of the expansion sleeve body 11 involves a plurality of circumferentially arranged support plates 13, and the orientation of these circumferentially arranged support plates 13 under normal conditions is basically consistent with the axial direction of the expansion sleeve body 11. On the other hand, the aforementioned support seat 12 has an external thread that matches the internal thread of the expansion sleeve body 11, and correspondingly, the end or bottom of the support seat 12 is also designed with an annular inclined surface 14 that is inclined radially outward; the annular inclined surface 14 is used to gradually push the support plate 13 during the process of the expansion sleeve body 11 and the support seat 12 being connected by threaded cooperation and the relative movement of the two in the axial direction, so that it expands outward along the radial direction of the expansion sleeve body 11. Since the multiple support plates 13 are arranged in an annular manner, they can expand outward in different directions after being pushed by the annular inclined surface 14, and the expanded support plates 13 can form support for the inner wall of the horizontal arm 2 of the three-dimensional coordinate measuring machine in their respective orientations. When the multiple support plates 13 all form support for the inner wall of the horizontal arm 2 of the three-dimensional coordinate measuring machine, the aforementioned annular support is formed.

[0020] In this embodiment, the expansion sleeve 11 and the support seat 12 are mutually squeezed to expand the plurality of support plates 13 arranged in the circumferential direction outward, thereby forming a circumferential support for the inner cavity of the horizontal arm 2. After arranging a plurality of support units 1 according to the length of the horizontal arm 2 and other conditions, the deflection of the horizontal arm can be reduced. And due to the toughness of the support plate 13 itself, it has a certain vibration reduction effect after supporting the inner cavity of the horizontal arm 2.

[0021] According to another embodiment of the present invention, in order to facilitate processing and design, the longitudinal section of the support seat 12 can be designed to be annular T-shaped, that is, Figure 2 As shown, the support seat 12 and the expansion sleeve 11 have threading channels inside. Considering that the inner cavity of the horizontal arm of the three-dimensional coordinate measuring machine is circular, the support unit 1 is also designed with a circular ring design, that is, the outer contour of the cross section of the expansion sleeve 11 and the support seat 12 at any position is circular.

[0022] Furthermore, the above-mentioned support plates 13 can be designed as strip-shaped rectangles, and the lengths and widths of the multiple support plates 13 are equal. At the same time, in the circumferential arrangement, the central axis of the expansion sleeve 11 can be taken as the center, so that the angles between each two adjacent support plates 13 in the radial direction of the expansion sleeve 11 are equal, thereby forming multi-angle support for the horizontal arm 2 of the three-dimensional coordinate measuring machine. Moreover, since each support plate 13 is independently fixed on the expansion sleeve 11, the angle between the expansion of each support plate 13 and the central axis of the expansion sleeve 11 is also different, so its support adaptability is strong, and it can adapt to the irregular structure of the inner cavity of the horizontal arm 2 of the three-dimensional coordinate measuring machine, and also realize circumferential support for it, avoiding the irregular structure of the inner cavity of the horizontal arm 2 of the three-dimensional coordinate measuring machine affecting the effect of the circumferential support.

[0023] refer to Figure 3 and Figure 4 As shown, according to another embodiment of the present invention, the support unit 1 in the above embodiment can be directly Figure 3 The end of the horizontal arm 2 of the coordinate measuring machine shown is placed in its inner cavity, and then the expansion sleeve 11 and the support seat 12 cooperate with each other to make the support plate 13 expand in the inner cavity of the horizontal arm 2 of the coordinate measuring machine, thereby forming an annular support.

[0024] refer to Figures 1 to 4 As shown, in actual use, the preferred embodiment of the present invention is to calculate the number of internal supports required according to the total length and telescopic length of the horizontal arm of the three-dimensional measuring machine, and then move the support unit 1 to the position from the end of the horizontal arm 2 of the three-dimensional measuring machine in sequence, and then use the tool to make the expansion sleeve 11 and the support seat 12 of the support unit 1 rotate relative to each other from the end, and make the two move relative to each other in the bearing upward through the mutually matched threads, and the axial overlap surface of the two gradually increases, and the annular support plate 13 is gradually expanded outward through the annular inclined surface 14 at the end of the support seat 12, so as to form annular support for the horizontal arm at the current position, thereby reducing the excessive deflection generated during its telescopic process. At the same time, in order to fix the support seat in the inner cavity of the horizontal arm to prevent it from rotating, the horizontal arm and the support seat can be matched in size to form a clamping between the inner cavity of the horizontal arm and the support seat. After the annularly arranged support plates 13 complete the support, the metal toughness of the support plates 13 themselves can be used to buffer the vibration generated by the telescopic movement of the horizontal arm, and thus to a certain extent, it can also play a vibration reduction role.

[0025] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0026] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, drawings, and claims, a variety of variations and improvements may be made to the components and / or layout of the subject combination layout. In addition to variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. An expansion sleeve type circumferential support system for a horizontal arm of a three-dimensional coordinate measuring machine, comprising a support unit (1), characterized in that: The support unit (1) comprises an expansion sleeve body (11) and a support seat (12); the expansion sleeve body (11) has an internal thread, and the edge of the expansion sleeve body (11) has a plurality of support plates (13) arranged in an annular direction in the axial direction; the support seat (12) has an external thread matching the internal thread, and the support seat (12) is also provided with an annular inclined surface (14) inclined radially outward; the annular inclined surface (14) is used to gradually push the support plate (13) to expand radially outward along the expansion sleeve body (11) during the axial relative movement of the expansion sleeve body (11) and the support seat (12), thereby forming annular support for the inner wall of the horizontal arm (2) of the three-dimensional coordinate measuring machine.

2. The expansion sleeve type annular support system for the horizontal arm of a three-dimensional coordinate measuring machine according to claim 1, characterized in that: The longitudinal section of the support seat (12) is in a circular T-shape, and both the support seat (12) and the expansion sleeve body (11) have threading channels inside.

3. The expansion sleeve type annular support system for the horizontal arm of a three-dimensional coordinate measuring machine according to claim 1 or 2, characterized in that: The cross-sections of the expansion sleeve body (11) and the support seat (12) at any position are circular.

4. The expansion sleeve type annular support system for the horizontal arm of a three-dimensional coordinate measuring machine according to claim 1 or 2, characterized in that: The support plates (13) are all rectangular in shape, and the lengths and widths of the plurality of support plates (13) are equal.

5. The expansion sleeve type annular support system for the horizontal arm of a three-dimensional coordinate measuring machine according to claim 1, characterized in that: A plurality of support units (1) are arranged in the inner cavity of the horizontal arm (2) of the three-dimensional coordinate measuring machine at preset intervals.

6. The expansion sleeve type annular support system for the horizontal arm of a three-dimensional coordinate measuring machine according to claim 1 or 5, characterized in that: The horizontal arm (2) of the three-dimensional coordinate measuring machine is a telescopic arm with a hollow inner cavity.

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