Deep hole measuring device

Abstract

The utility model belongs to the technical field of inspection and detection, and discloses a deep hole measuring device. Comprising left and right driven gears, a main gear, a measuring rod, a reader, a guide rail plate, a fixing plate, a fixing bolt, a driving rack and a workpiece. The measuring rod rotates to drive the main gear fixed at the lower end of the measuring rod and the reader fixed at the upper end of the measuring rod, the main gear drives the left driven gear and the right driven gear to rotate synchronously, the driven gears on the two sides drive the driving racks at the left end and the right end respectively, semicircular contacts are arranged at the tail ends of the driving racks, and when the contacts make contact with the inner wall of a measured part, the measuring rod stops rotating, and the reader reads. By means of the device, reading can be achieved without taking out a tool, stepped holes with large inside and small outside can be measured, inner holes with the length-diameter ratio larger than 10 can be measured, and the purposes of saving operation time and improving measurement accuracy are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of inspection and detection, and particularly relates to a deep hole measuring device for measuring parts with stepped inner holes. BACKGROUND

[0002] With the development of measurement technology and the improvement of the measurement accuracy requirement of reverse engineering, the measurement of parts with stepped inner holes is a prominent problem, and such parts have the following characteristics: the cylindrical shape has an inner hole, the length-diameter ratio is large, that is, the inner hole step is very deep, the inner diameter micrometer cannot be operated, the caliper spanner length cannot be reached, and the scanner cannot measure the narrow and deep inner hole. A special measuring tool needs to be designed, and the present scheme has the characteristics of simple structure, convenient and simple operation, low requirement on the operation level of the operator, high precision, wide application range, and is beneficial to batch production and large-scale promotion.

[0003] The traditional measurement method is to insert the inner caliper into the inner hole, but the caliper requires a higher operation level of the operator, needs to be shaken left and right to make the caliper correspond to the diameter, and needs to be taken out to cooperate with the caliper reading, but it is impossible to take out the caliper for the stepped hole with a large inner diameter and a small outer diameter.

[0004] In view of the above problems, the present scheme has the characteristics that the reading can be taken without taking out the tool, the stepped hole with a large inner diameter and a small outer diameter can be measured, the inner hole with a length-diameter ratio greater than 10 can be measured, the digital display reading can be taken, the gear can be replaced to change the transmission ratio to adapt to the measurement of holes of various specifications, and the gear transmission can theoretically achieve the measurement accuracy of a clock. CONTENT OF THE UTILITY MODEL

[0005] In order to solve the above technical problems, combined with production experience, through continuous research and development experiments, a deep hole measuring device is obtained.

[0006] The technical scheme of the utility model is as follows: a deep hole measuring device, comprising a measuring rod 3, a main gear 2, a driven gear 1, a driving rack 8 and a reader 4;

[0007] The reader 4 is sleeved on the measuring rod 3; the reader 4 is a hollow cylinder, and the surface is provided with a scale, which rotates synchronously with the main gear 2;

[0008] One end of the measuring rod 3 is connected with the main gear 2; the main gear 2 is meshed with the driven gear 1 on both sides; and the driven gear 1 is meshed with the driving rack 8 at the bottom.

[0009] In the vertical direction, the highest end of the driving rack 8 is lower than the lowest end of the main gear 2.

[0010] When the diameter ratio of the inner hole and the outer hole of the part to be detected is less than 1.5 times, the main gear 2 and the driven gear 1 have the same modulus, and the number of teeth of the main gear 2 is greater than that of the driven gear 1.

[0011] When the diameter ratio of the inner hole and the outer hole of the part to be detected is greater than 1.5 times, the module of the main gear 2 and the driven gear 2 is the same, and the number of teeth of the main gear 2 is less than the number of teeth of the driven gear 1.

[0012] Further, the deep hole measuring device further comprises a guide rail plate 5; the guide rail plate 5 is fixed on the upper surface and the lower surface of the main gear 2 respectively; the driven gear 2 is connected with the guide rail plate 5 and fixed in the axial movement; a through guide rail is opened on the guide rail plate 5 located on the lower surface of the main gear 2, and the driving rack 8 moves on the through guide rail.

[0013] The lower end of the measuring rod 3 and the lower end of the driven gear 1 are provided with axial positioning steps 10 and are guided on the through guide rail.

[0014] The end of the driving rack 8 is provided with a semicircular contact point.

[0015] The deep hole measuring device provided by the utility model is convenient to operate, especially suitable for stepped inner holes. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic view of the guide rail plate structure of the lower part in example 1;

[0017] Figure 2 It is an axonometric view of the overall structure;

[0018] Figure 3 It is a top view of the transmission mechanism;

[0019] Figure 4 It is a schematic view of the overall mapping structure including the measured workpiece;

[0020] Figure 5 It is a sectional view of the workpiece;

[0021] Figure 6 It is a front view of the workpiece measurement;

[0022] Figure 7 It is a schematic view of the axial positioning step.

[0023] In the drawing: 1, left and right driven gears, 2, main gear, 3, measuring rod, 4, reader, 5, guide rail plate, 6, fixed plate, 7, bolt, 8, driving rack, 9, workpiece. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme of the utility model embodiments will be described clearly and completely below in combination with the drawings in the utility model embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, but not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the utility model. It should be noted that the terms used here are only for describing the specific embodiments, but not intended to limit the exemplary embodiments according to the utility model. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or their combination.

[0025] Unless specifically stated otherwise, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in the examples herein are not intended to limit the scope of the application. It should also be understood that the size of the various parts shown in the drawings can not be to scale. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the description of the application. In all examples shown and discussed herein, any specific value should be interpreted as merely illustrative and not as a limitation. Thus, other examples of the exemplary embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0026] In the description of the utility model, it is understood that the orientation words such as '' front, back, up, down, left, right '' '' horizontal, vertical, perpendicular, horizontal '' and '' top, bottom '' and the like indicated orientation or positional relationship is usually based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, in the absence of the opposite statement, these orientation words do not indicate and imply that the device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as the limitation of the protection scope of the utility model. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawing. For example, if the device in the drawing is inverted, the device described as '' above other devices or structures '' or '' above other devices or structures '' will be positioned '' below other devices or structures '' or '' below other devices or structures ''. Thus, the exemplary term '' above '' can include both '' above '' and '' below ''.

[0027] In addition, it should be noted that the use of '' first, second '' and the like to limit parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore, it cannot be understood as the limitation of the protection scope of the utility model.

[0028] Of course, the above description is only for the preferred embodiment of the utility model, the utility model is not limited to the above-mentioned embodiments, it should be explained that, under the teaching of the present application, all equivalent substitutions, obvious deformation forms made by any person skilled in the art fall within the essential scope of the present application, and should be protected by the utility model.

[0029] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0030] A deep hole measuring device, by rotating the measuring rod 3, drives the main gear 2 fixed at the lower end of the measuring rod 3 and the reader 4 at the upper end, the main gear 2 drives the left and right driven gears 1, the driven gears 1 on both sides drive the driving rack 8, the end of the driving rack 8 has a semicircular contact point, when the contact point contacts the inner wall of the measured workpiece 9, the measuring rod 3 stops rotating, and the reader 4 reads the reading.

[0031] The upper guide rail plate 5 is a fixed plate 6 with a middle fixed hole, a left upper fixed hole, a right lower fixed hole and a hexagonal bolt fixed hole, and is fixed through a bolt 7; it plays a role in fixing the axial movement of the main gear 2 and the left and right driven gears 1, and only allows rotation in the circumferential direction. The lower guide rail plate 5 has a left upper fixed hole, a right lower fixed hole, a hexagonal bolt fixed hole and a through guide rail, and plays a role in fixing the axial movement of the main gear 2 and the left and right driven gears 1, and only allows rotation in the circumferential direction, while limiting the horizontal movement of the left and right drive racks 8 in the diametric direction.

[0032] The lowest end of the drive rack 8 is lower than the lowest end of the main gear 2 in the vertical direction, and is not in the same plane, so it can move left and right without interfering with the main gear 2.

[0033] The reader 4 has a cylindrical structure, with a scale on the surface, and rotates synchronously with the main gear 2, with low cost;

[0034] The reader 4 has another structure of an electronic reader, which has a built-in encoder, can be zeroed at any position, has a metrological verification function, has a grating and a digital display screen, when the drive rack 8 contacts the inner wall of the measured workpiece, triggers the encoder to send a signal, after signal processing, sends the digital display screen, and the reading is more convenient.

[0035] Turn the main gear 2 clockwise to make the left and right drive racks 8 retract; insert the deep hole measuring device into the inner hole, and when it reaches the approximate position of the stepped hole, turn the main gear 2 counterclockwise to make the left and right drive racks 8 extend until they contact the inner hole side wall, then the main gear 2 cannot continue to rotate, the reader 4 displays the reading, records it, and then turns the main gear 2 clockwise to make the left and right drive racks 8 retract, and takes out the deep hole measuring device from the measured workpiece.

[0036] The characteristics of the deep hole measuring device are: simple structure, low cost; easy to operate, low requirement for the operator's operation level; good structural strength, high service life; wide application range; high precision.

Claims

1. A deep hole measuring device, characterized by, The deep hole measuring device comprises a measuring rod (3), a main gear (2), a driven gear (1), a driving rack (8) and a reader (4); The reader (4) is sleeved on the measuring rod (3); the reader (4) is a hollow cylinder with a scale on the surface and rotates synchronously with the main gear (2); One end of the measuring rod (3) is connected with the main gear (2); the main gear (2) is meshed with the driven gears (1) on both sides; the bottom of the driven gear (1) is meshed with the driving rack (8).

2. The deep hole measuring device of claim 1, wherein, In the vertical direction, the highest end of the driving rack (8) is lower than the lowest end of the main gear (2).

3. The deep hole measuring device of claim 1, wherein, When the diameter ratio of the inner hole and the outer hole of the part to be detected is less than 1.5 times, the module of the main gear (2) and the driven gear (1) is the same, and the number of teeth of the main gear (2) is greater than that of the driven gear (1).

4. The deep hole measuring device of claim 1, wherein, When the diameter ratio of the inner hole and the outer hole of the part to be detected is greater than 1.5 times, the module of the main gear (2) and the driven gear (1) is the same, and the number of teeth of the main gear (2) is less than that of the driven gear (1).

5. The deep hole measuring device of claim 1, wherein, It also comprises a guide rail plate (5); the guide rail plate (5) is fixed on the upper surface and the lower surface of the main gear (2) respectively; the driven gear (1) is connected with the guide rail plate (5) to fix its axial movement; the guide rail plate (5) on the lower surface of the main gear (2) is provided with a through guide rail, and the driving rack (8) moves on the through guide rail.

6. The deep hole measuring device of claim 5, wherein, The lower end of the measuring rod (3) and the lower end of the driven gear (1) are provided with axial positioning steps and are guided on the through guide rail.

7. The deep hole measuring device of claim 1, wherein, The end of the driving rack (8) is provided with a semicircular contact.

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