Length inspection device for elevation rod

Abstract

The utility model provides an elevation rod length inspection device which is characterized by comprising a radial positioning sleeve, an axial positioning block detachably mounted at the top end of the radial positioning sleeve, an indirect measuring column arranged at the upper end of the axial positioning block, and an auxiliary measuring column arranged at the top end of the indirect measuring column. The diameter of the auxiliary measuring column is smaller than that of the indirect measuring column main body structure, a positioning table is formed between the auxiliary measuring column and the indirect measuring column main body structure, the outer diameter of the indirect measuring column is the same as the inner diameter of the radial positioning sleeve, and the outer diameter of the indirect measuring column and the radial positioning sleeve are coaxially arranged. The elevation rod length inspection device is simple in structure, low in manufacturing cost and convenient to use and operate, physical limiting is provided for elevation rod detection through the axial positioning block, the axial positioning block is further provided with the auxiliary measuring column, and the measurement accuracy is improved. The auxiliary measuring column provides a measuring point which is coaxial with and on the same circumferential surface as the measuring cylinder at one end, not inserted into the radial positioning sleeve, of the elevation rod, so that the measuring operation becomes very simple.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of railway construction surveying tools, and particularly relates to a length inspection device for an elevation rod. BACKGROUND

[0002] The elevation rod length testing device is mainly used for detecting the machining precision of an elevation rod (also known as a leveling rod) of a measuring tool used in a measuring process of track precision adjustment of railway construction projects, and mainly detects the length precision of the elevation rod. There are two installation methods for the tracks of a train, especially high-speed rails, one is to use ballast to pave the tracks, and the other is to pave the tracks on track plates. The latter has higher precision, especially for high-speed rails with a speed of 350 km / h, and at present, track plates are mostly used to install and fix the tracks. The installation precision of the track plates determines the precision of the tracks, and the height difference and smoothness requirements of the left and right tracks are both very strict. A pair of CPIII control point embedded parts are usually installed and embedded every 60 meters at relatively stable positions on both sides of the railway line, and the accurate positions of the CPIII control point embedded parts, including the plane position and the elevation position, are obtained by using the CPIII control points to form a three-dimensional control reference network. The CPIII control points are used as the reference to adjust the track plates, so as to control and fix the track plates. The track plates have special track fixing devices, so as to complete the precise control and installation and fixation of the tracks. The CPIII control point embedded parts are generally made of stainless steel and are embedded in relatively stable places on both sides of the railway line before measurement, such as retaining walls, tunnel walls, or CPIII control piles. Once embedded, they form permanent fixed points. The positions of the CPIII control point embedded parts are measured and calibrated by using a total station and other methods to measure the specific plane position and height. The current technology mainly uses the hole and end face of the embedded part to insert a plane connecting rod, and then installs a prism on the plane connecting rod. The prism has a center point, and the position of the point is measured by using an optical instrument, and the coordinates are calibrated and recorded in a database, so as to use the point as a reference datum for the plane position and the elevation position. At the same time, the elevation (leveling) measurement usually uses an indium steel ruler to measure, and the indium steel ruler needs to be placed vertically and must require an elevation positioning point. The traditional method is to process a hemisphere, and then insert the connecting body into the hole of the CPIII control point embedded part at the same time. This connecting rod with a hemisphere is called an "elevation rod". When the elevation rod is processed, the center of the ball is coincided with the center position of the prism. The commonly used size is that the distance between the center of the prism and the end face of the CPIII control point embedded part is 150±0.01 mm, and the distance between the center of the ball of the elevation rod and the end face of the CPIII control point embedded part must also be 150±0.01 mm. The CPIII control point embedded part may be vertically embedded, horizontally embedded, or slightly upwardly embedded during construction.Theoretically, the ball center of the elevation rod can reflect the prism center coordinate position described above. Since the ball center is an imaginary point that cannot be contacted, and the leveling indium steel ruler can only contact the spherical surface, a compensation value (-10mm) needs to be added to the measured spherical height. In order to fix the end face, there is a step larger than the hole diameter at the end face of the CPIII control point pre-embedded part, so that the position of the measured spherical high point cannot coincide or be parallel to the axis of the connecting rod, causing measurement difference and inaccurate measurement of the height of the spherical surface. SUMMARY

[0003] Therefore, the present application aims to overcome the defects in the prior art and provides an elevation rod length inspection device.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0005] An elevation rod length inspection device, comprising a radial positioning sleeve, an axial positioning block is detachably installed at the top end of the radial positioning sleeve, an indirect measurement column is arranged at the upper end of the axial positioning block, an auxiliary measurement column is arranged at the top end of the indirect measurement column, the diameter of the auxiliary measurement column is smaller than the diameter of the main body structure of the indirect measurement column, a positioning table is formed between the auxiliary measurement column and the main body structure of the indirect measurement column, the outer diameter of the indirect measurement column is the same as the inner diameter of the radial positioning sleeve, and the outer diameter of the indirect measurement column is coaxially arranged with the radial positioning sleeve.

[0006] Further, the axial positioning block and the radial positioning sleeve are fixed by fastening screws.

[0007] Further, a connecting portion is arranged on the periphery of the axial positioning block, and the fastening screws are installed on the connecting portion.

[0008] Further, 3-5 fastening screws are uniformly arranged on the connecting portion in the circumferential direction of the axial positioning block.

[0009] Further, the fastening screws are countersunk screws.

[0010] Further, the axial positioning block is made of stainless steel material or aluminum alloy material.

[0011] Further, the roughness of the inner wall of the radial positioning sleeve is 0.5μm.

[0012] Compared with the prior art, the present application has the following advantages:

[0013] Further, the roughness of the inner wall of the radial positioning sleeve is 0.5μm.

[0012] Compared with the prior art, the present application has the following advantages:

[0013] The height rod length inspection device provided by the application has simple structure, low manufacturing cost, convenient operation, axial positioning blocks provide physical limiting for height rod detection, and an auxiliary measuring column is further arranged on the axial positioning blocks, the auxiliary measuring column provides a measuring point coaxial with and on the same circumferential surface of a measuring cylinder at one end of a radial positioning sleeve not inserted into the height rod, so that the measuring structure is ensured to be accurate, and the measuring operation is very simple. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification. The illustrations are shown to explain the present application and are not intended to limit the present application in any manner. In the drawings:

[0015] Fig. 1 A structural schematic diagram of the present application;

[0016] Fig. 2 A structural schematic diagram of the radial positioning sleeve in the present application;

[0017] Fig. 3 A structural schematic diagram of the axial positioning block in the present application;

[0018] Fig. 4 A schematic diagram of the present application in application. DETAILED DESCRIPTION

[0019] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0020] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] A device for checking the length of an elevation pole, such as Figs. 1 to 4 As shown, the system includes a radial positioning sleeve 1, whose inner diameter is clearance-fitted with the elevation rod to ensure that the gap between the positioning sleeve and the elevation rod is less than 0.05 mm, thus making the measurement error negligible. An axial positioning block 2 is detachably installed at the top of the radial positioning sleeve, and an indirect measuring column 3 is provided at the upper end of the axial positioning block. An auxiliary measuring column 4 is provided at the top of the indirect measuring column. The diameter of the auxiliary measuring column is smaller than the diameter of the main structure of the indirect measuring column. A positioning platform 5 is formed between the auxiliary measuring column and the main structure of the indirect measuring column. The diameter of the auxiliary measuring column is the same as the diameter of the measuring cylinder at the end of the elevation rod without the hemispherical part, which can provide a measurement point that is coaxial with and on the same circumferential surface as the measuring cylinder 8 of the elevation rod 7. The outer diameter of the indirect measuring column is the same as the inner diameter of the radial positioning sleeve, and the outer diameter of the indirect measuring column is arranged coaxially with the radial positioning sleeve.

[0024] The axial positioning block and the radial positioning sleeve are fixed together by fastening screws 6. The axial positioning block has a connecting part on its periphery, where the fastening screws are installed. The connecting part of the axial positioning block has screw holes 9, with the upper end of the screw holes having a countersunk structure. 3-5 fastening screws are evenly distributed along the circumference of the axial positioning block on the connecting part. The fastening screws are countersunk screws. After the axial positioning block is installed, the heads of the fastening screws will not exceed the measuring end face of the axial positioning block.

[0025] The inner wall roughness of the radial positioning sleeve is 0.5 μm, and the bottom surface roughness of the axial positioning block is 0.5 μm. The height of the axial positioning block is 8 ± 0.01 mm. This invention creates an axial positioning block with the same size as the part of the elevation rod inserted into the CPIII control point pre-embedded part, thereby ensuring that the measured point is parallel to the axis of the elevation rod during measurement. Preferably, the outer contour of the radial positioning sleeve is circular, hexagonal, or stepped. The axial positioning block is made of stainless steel or aluminum alloy.

[0026] The method for checking the length of the elevation rod by using the elevation rod length checking device is as follows: first, the elevation rod is inserted into the radial positioning sleeve, the gap between the radial positioning sleeve and the elevation rod is less than 0.05 mm, the total height of the checking device and the elevation rod is measured by using a vernier caliper, then the measurement result is subtracted by the height of the axial positioning block, and the height of the elevation rod can be obtained.

[0027] The elevation rod length checking device provided by the application has simple structure, low manufacturing cost, convenient operation, provides physical limiting for the elevation rod detection through the axial positioning block, and the auxiliary measurement column is further arranged on the axial positioning block, the auxiliary measurement column provides a measurement point coaxial with and on the same circumferential surface of the measurement cylinder at one end of the elevation rod not inserted into the radial positioning sleeve, so that the measurement structure is ensured to be accurate, and the measurement operation is very simple.

[0028] The above only describes the preferred embodiments of the application, and is not used to limit the application, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. An elevation rod length verification device characterized by: The radial positioning sleeve is provided with an axial positioning block at the top end, an indirect measuring column at the upper end of the axial positioning block, and an auxiliary measuring column at the top end of the indirect measuring column, the diameter of the auxiliary measuring column being smaller than the main body structure diameter of the indirect measuring column, a positioning platform being formed between the auxiliary measuring column and the main body structure of the indirect measuring column, the outer diameter of the indirect measuring column being the same as the inner diameter of the radial positioning sleeve, and the outer diameter of the indirect measuring column being coaxially arranged with the radial positioning sleeve.

2. A height rod length verification device according to claim 1, wherein: The axial positioning block and the radial positioning sleeve are fixed by fastening screws.

3. A height rod length verification device according to claim 2, wherein: The axial positioning block is provided with a connecting portion at the periphery, and the fastening screws are arranged on the connecting portion.

4. A height rod length verification device according to claim 3, wherein: 3-5 fastening screws are uniformly arranged on the connecting portion along the circumferential direction of the axial positioning block.

5. The device of claim 2, wherein: The fastening screws are countersunk screws.

6. The device of claim 1, wherein: The height of the axial positioning block is 8±0.01 mm.

7. The device of claim 1, wherein: The axial positioning block is made of stainless steel or aluminum alloy.

8. The device of claim 1, wherein: The roughness of the inner wall of the radial positioning sleeve is 0.5 μm.

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