Small hole inner contour measuring device

Abstract

The utility model relates to a small hole inner contour measuring device which comprises V-shaped blocks, a dial indicator and a workbench, the V-shaped blocks and the dial indicator are arranged on the workbench, and the V-shaped blocks are arranged on one side of the dial indicator at intervals. The dial gauge is composed of a gauge stand, a gauge body and a gauge head, one end of the gauge head is rotatably connected with the gauge body, the other end of the gauge head fixes a ball head, and one end, opposite to the gauge head, of the ball head is connected with one end of the measuring rod; the measuring rod comprises a rod part and a head part, the diameter of the rod part is gradually reduced along the length direction of the rod part, the large-diameter end of the rod part is fixed with the ball head, and the small-diameter end of the rod part is connected with the head part; a workpiece is placed between two inclined planes of the V-shaped block, the measuring head is placed on the central axis of an inner hole of the workpiece, through movement of a single axis X, a corresponding coordinate Z, an indicating value of a variable quantity read by a light curtain system, a coordinate numerical value imported and a least square method, a graph is obtained through fitting, analysis curve characteristics and lever accurate zooming multiplying power parameters are obtained, and comparison and correction are carried out through measurement of a standard ball.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of precision measurement, especially to a small hole inner profile measuring device. BACKGROUND

[0002] In the prior art, the measurement of the inner profile of a small hole is mostly dependent on the indirect judgment of the shape of an inner grinding head, which is low in precision and cannot be quantified. In the field of precision machining, the detection of the inner profile shape of a small hole with a diameter of 1mm to 2mm and a depth-diameter ratio of 3 to 5 is a key link to ensure the quality of workpieces. Such holes are commonly found in aerospace precision parts, medical devices such as minimally invasive surgical tools, and high-precision molds, and the roundness, cylindricity, and surface roughness of their inner walls directly affect the function and service life of the workpieces. The probe diameter of traditional profile measuring instruments such as three-coordinate measuring machines is usually greater than 1mm, which cannot be used for contact measurement inside the small hole.

[0003] The above prior art solution has the following defects: it is difficult to effectively detect a deep hole with a diameter of 1mm, and the problem of collecting projection data of a deep hole has not been solved. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a small hole inner profile measuring device to solve the problems existing in the prior art.

[0005] The above technical purpose of the utility model is achieved through the following technical solution:

[0006] A small hole inner profile measuring device, comprising a V-shaped block, a dial gauge, and a workbench, wherein the V-shaped block and the dial gauge are both arranged on the workbench, and the V-shaped block is arranged on one side of the dial gauge at intervals;

[0007] The dial gauge is composed of a base, a dial body movably arranged on the base, and a dial head arranged at the end of the dial body away from the base, one end of the dial head is rotatably connected to the dial body, the other end of the dial head is fixedly connected to a ball head through screwing, a threaded hole is arranged at the end of the ball head opposite to the dial head, one end of a measuring rod is screwed into the threaded hole, and a rotating handle is arranged on the side of the base away from the dial body;

[0008] The measuring rod comprises an integrally formed rod portion and a head portion, the diameter of the rod portion gradually decreases along its length direction, the large-diameter end of the rod portion is fixedly connected to the threaded hole through screwing, and the small-diameter end of the rod portion is connected to the head portion; a centrifugal protrusion is arranged on the end of the head portion away from the rod portion.

[0009] The table body comprises a shell, a fixing rod, a rotating handle, a locking screw and a dial plate, the inside of the shell is provided with a swing measuring piece, the dial plate is arranged at the top end of the shell, one end of the swing measuring piece is fixedly connected with a table head, the other end of the swing measuring piece is in transmission connection with a pointer of the dial plate, the swing measuring interval is used for converting the swing amplitude of the table head into the rotation angle of the pointer, one side of the shell is insertedly fixed with the fixing rod, the locking screw is screwed on the fixing rod, and one end of the locking screw is abuttingly connected with the outer wall of the shell.

[0010] By adopting the above technical scheme, the head of the measuring rod is put into the hole diameter to be measured, the deep hole with a 1mm hole diameter is effectively probed, the swing measuring piece and the table head are fixed, the other end of the swing measuring piece is connected with the dial plate pointer, the swing measuring interval is used for converting the swing amplitude of the table head into the rotation angle of the pointer, the rotation angle of the pointer is read, and the data of the deep hole is collected.

[0011] In a further embodiment, a section of the locking screw away from the shell is provided with a rotating handle.

[0012] In a further embodiment, a sliding block is slidingly installed in the dovetail groove at the top end of the V-shaped block, a screw hole is arranged at the top end of the sliding block, the bottom of the screw hole is communicated with a through hole, axially horizontal sliding grooves are symmetrically arranged at the bottom end of the sliding block, locking rods are slidingly installed in the sliding grooves, the top end of the side of the locking rods close to each other is arranged as an inclined surface, a resisting rod is screwed in the screw hole, and the bottom end of the resisting rod is arranged as a circular truncated cone structure.

[0013] In a further embodiment, the surface of the head is provided with a carburized layer.

[0014] In a further embodiment, a plurality of lightening holes are arranged on the fixing rod.

[0015] In summary, the present application has the following beneficial effects:

[0016] 1. By gradually reducing the diameter of the rod along the length direction, the diameter of the measuring rod near the head can be reduced, so that the measuring rod can be put into the hole diameter to be measured;

[0017] 2. By fixing one end of the swing measuring piece to the table head and transmission connecting the other end of the swing measuring piece to the pointer of the dial plate, the swing amplitude of the table head can be converted into the rotation angle of the pointer, and the rotation angle of the pointer is read to collect the data of the deep hole; BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present application;

[0019] Figure 2 This is a schematic diagram of the measuring rod structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the micrometer of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the watch body of this utility model;

[0022] Figure 5 This is a schematic diagram of the V-shaped block structure of this utility model.

[0023] In the diagram, 1. V-block; 11. Slider; 12. Locking rod; 13. Stop rod; 2. Dial indicator; 21. Base; 211. Rotating handle; 22. Indicator body; 221. Outer casing; 222. Fixing rod; 223. Locking screw; 224. Dial; 2241. Pointer; 225. Turning the handwheel; 23. Indicator head; 3. Workbench; 4. Measuring rod; 41. Rod section; 42. Head; 43. Ball head. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0026] Example 1:

[0027] like Figures 1-4 As shown, a small hole inner contour measuring device includes a V-block 1, a dial indicator 2 and a worktable 3. The V-block 1 and the dial indicator 2 are both mounted on the worktable 3, and the V-block 1 is spaced apart on one side of the dial indicator 2.

[0028] The micrometer 2 is composed of a base 21, a body 22 movably arranged on the base 21, and a head 23 arranged on the body 22 away from the base 21, one end of the head 23 is rotatably connected with the body 22, and the other end of the head 23 is fixedly screwed with a ball head 43, the ball head 43 is provided with a threaded hole at one end thereof, and one end of a measuring rod 4 is screwed in the threaded hole, and the base 21 is provided with a rotating handle 211 on the side away from the body 22;

[0029] The measuring rod 4 is composed of an integrally formed rod portion 41, a head portion 42, and the ball head 43, the rod portion 41 gradually decreases in diameter along the length direction thereof, and the large-diameter end of the rod portion 41 is fixedly screwed with the threaded hole, and the small-diameter end of the rod portion 41 is connected with the head portion 42, and the head portion 42 is provided with a centrifugal protrusion at the end away from the rod portion 41.

[0030] The body 22 is composed of an outer shell 221, a fixing rod 222, a locking screw 223, a dial 224, and a rotating hand wheel 225, the inner part of the outer shell 221 is provided with a swing measuring member, the dial 224 is arranged at the top end of the outer shell 221, one end of the swing measuring member is fixedly connected with the head 23, and the other end of the swing measuring member is drivingly connected with a pointer 2241 of the dial 224, the swing measuring member is used to convert the swing amplitude of the head 23 into the rotation angle of the pointer 2241, one side of the outer shell 221 is insertingly and fixedly connected with the fixing rod 222, the locking screw 223 is screwed on the fixing rod 222, and one end of the locking screw 223 is abuttingly connected with the outer wall of the outer shell 221, and the locking screw 223 is provided with the rotating hand wheel 225 at the end away from the outer shell 221, the top end of the V-shaped block 1 is slidingly arranged in the dovetail groove, the top end of the sliding block 11 is provided with a threaded hole, the bottom of the threaded hole is connected with a through hole, the bottom end of the sliding block 11 is symmetrically provided with two horizontal sliding grooves in the axial direction, the sliding grooves are slidingly arranged with locking rods 12, the top end of the side of the locking rods 12 close to each other is provided with an inclined surface, a resisting rod 13 is screwed in the threaded hole, the bottom end of the resisting rod 13 is provided with a circular truncated cone structure, the surface of the head portion 42 is provided with a carburized layer, and the fixing rod 222 is provided with a plurality of lightening holes.

[0031] Specific implementation process: rotate the rotating handle 211, fix the watch base 21 on the workbench 3, install the sliding block 11 on the dovetail groove, fix the resisting rod 13 through the locking rod 12, place the measured workpiece between the two inclined surfaces of the V-shaped block 1, and fix the measured workpiece through the resisting rod 13, so that the measured workpiece cannot move in the V-shaped block, rotate the hand wheel 225 to make the dial indicator pointer 2241 zero, place the protrusion of the head part 42 of the measuring rod 4 in the axis of the inner hole of the measured workpiece, place the protrusion of the head part 42 of the measuring rod 4 on the inner wall of the hole diameter by moving the measuring rod 4, rotate the measured workpiece, observe and record the dial reading of the dial indicator 224, observe the upper end projection of the sphere by the single-axis X movement of the head part of the measuring rod 4, measure the corresponding coordinate Z by the high-precision light curtain system, record the coordinate value in the table, open the software, import the corresponding coordinate value, fit the graph by the least square method, further obtain the circular arc value or analyze the curve characteristics, and finally obtain the data of the inner contour of the small hole through the corresponding curve and the magnification.

[0032] In the embodiments disclosed in the present application, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense. For example, "connecting" can be fixed connection, detachable connection or integral connection; "connecting" can be direct connection or indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments disclosed in the present application can be understood according to the specific circumstances.

[0033] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A device for measuring the inner contour of a small hole, comprising a V-block (1), a dial indicator (2), and a worktable (3), characterized in that: The V-block (1) and the dial indicator (2) are both set on the workbench (3), and the V-block (1) is set at intervals on one side of the dial indicator (2); The dial indicator (2) consists of a base (21), a body (22) movably mounted on the base (21), and a head (23) located at the end of the body (22) away from the base (21). One end of the head (23) is rotatably connected to the body (22), and the other end of the head (23) is screwed and fixed by a ball head (43). The ball head (43) has a threaded hole at the end opposite to the head (23), and one end of a measuring rod (4) is screwed into the threaded hole. A rotating handle (211) is located on the side of the base (21) away from the body (22). The measuring rod (4) includes an integrally formed rod part (41), a head (42) and a ball head (43). The diameter of the rod part (41) gradually decreases along its length direction, and the large diameter end of the rod part (41) is screwed and fixed to the threaded hole. The small diameter end of the rod part (41) is connected to the head (42). A centrifugal protrusion is provided on a section of the head (42) away from the rod part (41).

2. The orifice inner contour measuring device according to claim 1, characterized in that: The watch body (22) includes a housing (221), a fixing rod (222), a locking screw (223), a dial (224), and a turning handwheel (225). The housing (221) is equipped with an oscillation measuring component inside. The dial (224) is located at the top of the housing (221). One end of the oscillation measuring component is fixedly connected to the watch head (23), and the other end of the oscillation measuring component is connected to the pointer (2241) of the dial (224). The oscillation measuring component is used to convert the oscillation amplitude of the watch head (23) into the rotation angle of the pointer (2241). One side of the housing (221) is inserted and fixed to the fixing rod (222). The locking screw (223) is screwed onto the fixing rod (222), and one end of the locking screw (223) is pressed against the outer wall of the housing (221).

3. The orifice inner contour measuring device according to claim 2, characterized in that: A handwheel (225) is provided on the section of the locking screw (223) away from the outer casing (221).

4. The orifice inner contour measuring device according to claim 1, characterized in that: A slider (11) is slidably installed in the dovetail groove at the top of the V-shaped block (1). A screw hole is provided at the top of the slider (11). The bottom of the screw hole is connected to a through hole. A horizontal sliding groove is symmetrically provided on both sides of the bottom end of the slider (11). A locking rod (12) is slidably installed in each of the sliding grooves. The top ends of the locking rods (12) on the side that are close to each other are all set as inclined surfaces. A stop rod (13) is screwed into the screw hole. The bottom end of the stop rod (13) is set as a frustum structure.

5. The orifice inner contour measuring device according to claim 1, characterized in that: The surface of the head (42) is provided with a carburized layer.

6. The orifice inner contour measuring device according to claim 2, characterized in that: The fixing rod (222) is provided with multiple weight-reducing holes.

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