Instrument for measuring inner diameter and outer diameter

Abstract

The utility model provides an instrument for measuring internal and external diameters, which is characterized in that connecting parts of two measuring pieces can be connected with a base in a sliding manner along the length direction of the base, and one end of each measuring piece along the height direction of the base is provided with a measuring part; elastic pieces are correspondingly arranged between two inner walls of the base in the length direction and the connecting part of the first measuring piece, and the first elastic piece is closer to the second measuring piece than the second elastic piece; the end part, deviating from the first elastic part, of the second elastic part is contacted with a knob; when the knob extrudes the second elastic piece along the length direction of the base to enable the elastic force applied to the first measuring piece to be greater than the elastic force applied to the first measuring piece by the first elastic piece, the measuring parts of the two measuring pieces are used for abutting against the outer wall of the measured piece in a working state; when the knob reduces the pressure on the second elastic piece to make the elastic force applied to the first measuring piece smaller than the elastic force applied to the first measuring piece by the first elastic piece, the measuring parts of the two measuring pieces are used for abutting against the inner wall of the measured piece in the working state. And the dial gauge is arranged on one of the measuring pieces.

Description

Technical Field

[0001] The utility model belongs to the field of measurement technology, and particularly relates to an instrument for measuring inner and outer diameters. Background Art

[0002] At present, in the field of measurement technology, product size measurement is very common, and the corresponding measurement methods are also diverse. It is known that the size of a product involves the inner diameter and the outer diameter. Common measuring tools for measuring inner and outer diameters are calipers, micrometers, three-coordinate measuring tools, etc. When measuring large sizes, the measurement accuracy of calipers and micrometers is low, while the cost of three-coordinate measuring tools is high, the applicable occasions are limited, and the measurement efficiency is low. Utility Model Content

[0003] In view of the above problems existing in the prior art, the main purpose of the utility model is to provide an instrument for measuring inner and outer diameters. The provided instrument for measuring inner and outer diameters has an adjustable range, a replaceable probe, a simple and quick measuring process, and can effectively ensure measurement accuracy.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] The utility model provides an instrument for measuring inner and outer diameters, which comprises a base, a first measuring piece, a second measuring piece and an indicator mounted on the first measuring piece or the second measuring piece; wherein:

[0006] The first measuring piece and the second measuring piece each include a connecting portion slidably connected to the base along the length direction of the base, and a measuring portion connected to one end of the connecting portion along the height direction of the base;

[0007] In the length direction of the base, the base has a first inner wall and a second inner wall; a first elastic member is provided between the connecting portion of the first measuring member and the first inner wall, a second elastic member is provided between the connecting portion of the first measuring member and the second inner wall, and the first elastic member is closer to the second measuring member than the second elastic member; an end of the second elastic member away from the first elastic member is also provided in contact with a knob;

[0008] When the knob presses the second elastic member along the length direction of the base so that the elastic force applied by the second elastic member to the connection part of the first measuring member is greater than the elastic force applied by the first elastic member to the connection part of the first measuring member, the measuring parts of the two measuring members are used to abut against the outer wall of the measured member in the working state;

[0009] When the knob reduces the pressure on the second elastic member along the length direction of the base so that the elastic force applied by the second elastic member to the connecting part of the first measuring member is smaller than the elastic force applied by the first elastic member to the connecting part of the first measuring member, the measuring parts of the two measuring members are used to resist the inner wall of the measured member when in working state.

[0010] As a further description of the above technical solution, the base is provided in the first slide groove and the second slide groove along its length direction;

[0011] The connecting portion of the first measuring member is slidably connected to the first sliding groove;

[0012] The connecting portion of the second measuring piece is slidably connected in the second sliding groove.

[0013] As a further description of the above technical solution, in the length direction of the base, the length of the first slide groove is smaller than the length of the second slide groove.

[0014] As a further description of the above technical solution, in the length direction of the base, a through hole is provided between the second inner wall of the first slide groove away from the second slide groove and the outer wall of the base, and the through hole is used for screwing in the knob.

[0015] As a further description of the above technical solution, when the knob cancels the pressure on the second elastic member along the length direction of the base, the second elastic member is partially accommodated in the through hole.

[0016] As a further description of the above technical solution, in the length direction of the base, a linear guide is further provided between the connecting portion of the first measuring piece and the first sliding groove.

[0017] As a further description of the above technical solution, the measuring part and the connecting part included in the first measuring piece and the second measuring piece are both detachably connected.

[0018] By means of the above technical solution, the outstanding effects of the utility model are:

[0019] 1. In the inner and outer diameter measuring instrument provided by the utility model, the connecting parts of the first measuring piece and the second measuring piece can be slidably connected to the base, so that the relative distance between the first measuring piece and the second measuring piece in the length direction of the base can be adjusted, thereby realizing the adjustable range of the inner and outer diameter measuring instrument;

[0020] 2. In the inner and outer diameter measuring instrument provided by the utility model, the base has a first inner wall and a second inner wall in its length direction; a first elastic member is provided between the connecting portion of the first measuring piece and the first inner wall, and a second elastic member is provided between the connecting portion of the first measuring piece and the second inner wall, and the first elastic member is closer to the second measuring piece than the second elastic member; a knob is also provided at the end of the second elastic member away from the first elastic member; before measuring the inner and outer diameters of the measured piece, it is only necessary to rotate the knob to increase or decrease the squeezing effect on the second elastic member, so that the elastic force applied by the second elastic member to the connecting portion of the first measuring piece is greater than the elastic force applied by the first elastic member to the connecting portion of the first measuring piece. The elastic force of the two measuring pieces can be used to press against the outer wall of the measured piece to measure the outer diameter of the measured piece when in working state, or the elastic force applied by the second elastic piece to the connecting part of the first measuring piece is smaller than the elastic force applied by the first elastic piece to the connecting part of the first measuring piece, so that the measuring parts of the two measuring pieces can be used to press against the inner wall of the measured piece to measure the inner diameter of the measured piece when in working state; thereby, the instrument for measuring inner and outer diameters can easily adapt to the two scenarios of inner and outer diameter measurement, and the final measurement accuracy can be guaranteed. After uncertainty evaluation, the measurement accuracy of the instrument for measuring inner and outer diameters is not more than 0.005mm, and the repeatability accuracy is not more than 0.002mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a state in which an inner and outer diameter measuring instrument is calibrated using a calibrator in an embodiment of the utility model;

[0022] Figure 2 It is a partial cross-sectional view of an instrument for measuring inner and outer diameters in an embodiment of the utility model.

[0023] Description of Figure Numbers:

[0024] 1. Base; 11. First slide groove; 12. Second slide groove; 2. First measuring piece; 3. Second measuring piece; 4. Indicator; 51. Connecting part; 52. Measuring part; 61. First elastic part; 62. Second elastic part; 7. Knob; 8. Linear guide; 91. Base; 92. Calibration block. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present utility model, it should be noted that the terms "upper", "middle", "lower", "inside", "outside", "front", "back", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The following describes the implementation method of the present utility model based on its overall structure.

[0027] See also Figure 1 to Figure 2 The utility model discloses an instrument for measuring inner and outer diameters, which comprises a base 1, a first measuring piece 2, a second measuring piece 3 and an indicator 4 installed on the first measuring piece 2 or the second measuring piece 3; wherein,

[0028] The first measuring piece 2 and the second measuring piece 3 each include a connecting portion 51 slidably connected to the base 1 along the length direction of the base 1, and a measuring portion 52 connected to one end of the connecting portion 51 along the height direction of the base 1;

[0029] In the length direction of the base 1, the base 1 has a first inner wall and a second inner wall; a first elastic member 61 is provided between the connecting portion 51 of the first measuring member 2 and the first inner wall, and a second elastic member 62 is provided between the connecting portion 51 of the first measuring member 2 and the second inner wall, and the first elastic member 61 is closer to the second measuring member 3 than the second elastic member 62; the end of the second elastic member 62 away from the first elastic member 61 is also in contact with a knob 7;

[0030] When the knob 7 presses the second elastic member 62 along the length direction of the base 1 so that the elastic force applied by the second elastic member 62 to the connecting portion 51 of the first measuring member 2 is greater than the elastic force applied by the first elastic member 61 to the connecting portion 51 of the first measuring member 2, the measuring portions 52 of the two measuring members are used to abut against the outer wall of the measured member in the working state;

[0031] When the knob 7 reduces the pressure on the second elastic member 62 along the length direction of the base 1 so that the elastic force applied by the second elastic member 62 to the connecting portion 51 of the first measuring member 2 is smaller than the elastic force applied by the first elastic member 61 to the connecting portion 51 of the first measuring member 2, the measuring portions 52 of the two measuring members are used to abut against the inner wall of the measured member when in working state.

[0032] With the above structure, before measuring the outer diameter of the measured piece, by rotating the knob 7, the knob 7 is pressed against the second elastic member 62 on the second inner wall side of the base 1 along the length direction of the base 1, and then the elastic force generated by the pressure on the second elastic member 62 is transmitted to the connecting portion 51 of the first measuring piece 2. At the same time, since the first elastic member 61 provided between the first measuring piece 2 and the first inner wall of the base 1 is pressed, the elastic force is reversely applied to the connecting portion 51 of the first measuring piece 2. Finally, when the elastic force generated by the second elastic member 62 is greater than that of the first elastic member 61, the measuring portion 52 connected to one end of the connecting portion 51 of the first measuring piece 2 along the height direction of the base 1 is forced to move toward the connecting portion 51 of the second measuring piece 3. Therefore, when the inner and outer diameter measuring instrument is used to measure the outer diameter of the measured piece, the measuring portions 52 of the two measuring pieces will be pressed against the measured piece. Before measuring the inner diameter of the workpiece, on the contrary, the knob 7 is rotated in the opposite direction to reduce the pressure on the second elastic member 62 along the length direction of the base 1, until the elastic force applied by the second elastic member 62 to the connection part 51 of the first measuring member 2 is less than the elastic force applied by the first elastic member 61 to the connection part 51 of the first measuring member 2, so that the measuring part 52 connected to one end of the connection part 51 of the first measuring member 2 along the height direction of the base 1 is forced to move away from the connection part 51 of the second measuring member 3. At this time, the inner diameter of the workpiece is measured by using the inner and outer diameter measuring instrument, and the measuring parts 52 of the two measuring parts will be pressed against the two points on the inner wall of the workpiece, so that the inner diameter measurement result finally displayed on the indicator 4 is more accurate. The magnitude of the measuring force (i.e., the magnitude of the force applied by the measuring parts 52 of the two measuring parts to the workpiece) is also determined by the amount of rotation of the knob 7. Therefore, by changing the relative positions of the two measuring pieces in the length direction of the base 1, the measuring range of the inner and outer diameter measuring instrument can be adjusted. Furthermore, by simply changing the rotation direction of the knob 7, it is easy to adapt to the two scenarios of inner and outer diameter measurement, and the final measurement accuracy is guaranteed. After uncertainty evaluation, the measurement accuracy of the inner and outer diameter measuring instrument provided by the utility model is not greater than 0.005mm, and the repeatability accuracy is not greater than 0.002mm.

[0033] See also Figure 1 Specifically, in this embodiment, the length direction of the base 1 is defined as the left-right direction, and the height direction is defined as the up-down direction. The first slide groove 11 and the second slide groove 12 are both provided on the base 1 along the left-right direction, and both penetrate the base 1 along the vertical direction, so that when the connecting parts 51 of the two measuring pieces are correspondingly slidably connected in the two slide grooves, the measuring part 52 connected to the lower end of the connecting part 51 can extend out of the slide groove and be used to respectively abut against the position to be measured of the measured piece to perform the measurement operation.

[0034] Specifically, in this embodiment, in the length direction of the base 1, the length of the first slide groove 11 is smaller than the length of the second slide groove 12, so that the first measuring piece 2 set in the first slide groove 11 can slide a smaller distance relative to the base 1 in the left-right direction than the second measuring piece 3 set in the second slide groove 12. Therefore, the measuring range of the inner and outer diameter measuring instrument is mainly obtained by sliding the second measuring piece 3 in the second slide groove 12 to the desired position along the left-right direction, so that the distance between the two measuring pieces changes. More specifically, the length of the first slide groove 11 in the left-right direction is extremely small, while the second slide groove 12 provides a large sliding range for the second measuring piece 3 in the left-right direction for adjusting the measuring range. The first slide groove 11 is mainly used to install the first measuring piece 2, and cooperate with the knob 7 to make the first measuring piece 2 tighten to the left end or to the right end, thereby ensuring that when the inner and outer diameter measuring instrument measures the measured piece, both measuring pieces can press against the measuring position of the measured piece within the appropriate measuring range, so that the final measurement accuracy is improved.

[0035] See also Figure 1 as well as Figure 2 Specifically, in this embodiment, in the left-right direction, the first inner wall is the right groove wall of the first slide groove 11, and the second inner wall is the left groove wall of the first slide groove 11. A through hole is provided between the left groove wall of the first slide groove 11 and the left end outer wall of the base 1 for screwing in the knob 7. It should be understood that even if the knob 7 completely cancels the squeezing force to the right on the second elastic member 62, the knob 7 will not fall directly from the through hole. For example, the through hole is a threaded hole. Even if the knob 7 completely cancels the squeezing force to the right on the second elastic member 62, the remaining part of the knob 7 in the through hole is still threadedly connected to the through hole, which also avoids the loss of parts of the instrument for measuring inner and outer diameters.

[0036] Specifically, in this embodiment, when the knob 7 cancels the squeezing force to the right on the second elastic member 62, the left half of the second elastic member 62 will rebound to the left and be accommodated in the through hole. At this time, both elastic members can be in a natural relaxation state (i.e., a state that is neither stretched nor compressed).

[0037] See also Figure 2Specifically, in this embodiment, in the left-right direction, a linear guide 8 is further provided between the connecting portion 51 of the first measuring piece 2 and the first slide groove 11, so that the elastic force applied to the first measuring piece 2 by the two elastic members along the left-right direction can be adjusted by rotating the knob 7, so that the measuring portion 52 of the first measuring piece 2 tends to move leftward or rightward relative to the measuring portion 52 of the second measuring piece 3, and the first measuring piece 2 as a whole will not tilt leftward or rightward. The linear guide 8 can be, for example, a high-precision linear bearing.

[0038] See also Figure 1 as well as Figure 2 Specifically, in this embodiment, the measuring part 52 and the connecting part 51 included in the first measuring piece 2 and the second measuring piece 3 are both detachably connected, so that the measuring part 52 of different shapes can be easily replaced to adapt to the inner and outer wall shapes of more measured parts (the measured part can be ring-shaped but not limited to ring-shaped). For example, when measuring the inner and outer diameters of a ring-shaped measured part, the measuring parts 52 of the first measuring piece 2 and the second measuring piece 3 can both use conventional disc-type probes. When the measured part is not ring-shaped, a measuring part 52 of other shapes can be selected to be connected to the connecting part 51.

[0039] See also Figure 1 Specifically, the inner and outer diameter measuring instrument provided in this embodiment adopts the principle of comparative measurement. Before using it for measurement (the inner and outer diameter measuring instrument has completed the adjustment of the elastic force of the elastic member), it is necessary to first use a calibrator (including a base 91, and two calibration blocks 92 arranged on the base 91 along the length direction, and the two calibration blocks 92 can be set to a first distance value along the length direction to calibrate the product to be calibrated) for calibration. The specific process is: hold the inner and outer diameter measuring instrument so that the measuring parts 52 of the two measuring pieces are correspondingly close to the sides of the two calibration blocks 92 on the base 91, and set the indicator 4 to zero (that is, set it to the true value of the calibrator), thereby completing the calibration; then you can use it to measure the measured piece, and its measurement process is similar to the calibration process, so that the measuring parts 52 of the two measuring pieces are close to the outer wall or inner wall of the measured piece, and the value displayed on the indicator 4 included therein is the size value of the measured piece.

[0040] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not limited to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any changes, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An instrument for measuring inner and outer diameters, characterized in that: It includes a base, a first measuring piece, a second measuring piece, and an indicator mounted on the first measuring piece or the second measuring piece; wherein, The first measuring piece and the second measuring piece each include a connecting portion slidably connected to the base along the length direction of the base, and a measuring portion connected to one end of the connecting portion along the height direction of the base; In the length direction of the base, the base has a first inner wall and a second inner wall; a first elastic member is provided between the connecting portion of the first measuring member and the first inner wall, a second elastic member is provided between the connecting portion of the first measuring member and the second inner wall, and the first elastic member is closer to the second measuring member than the second elastic member; an end of the second elastic member away from the first elastic member is also provided in contact with a knob; When the knob presses the second elastic member along the length direction of the base so that the elastic force applied by the second elastic member to the connection part of the first measuring member is greater than the elastic force applied by the first elastic member to the connection part of the first measuring member, the measuring parts of the two measuring members are used to abut against the outer wall of the measured member in the working state; When the knob reduces the pressure on the second elastic member along the length direction of the base so that the elastic force applied by the second elastic member to the connecting part of the first measuring member is smaller than the elastic force applied by the first elastic member to the connecting part of the first measuring member, the measuring parts of the two measuring members are used to resist the inner wall of the measured member when in working state.

2. The inner and outer diameter measuring instrument according to claim 1, characterized in that: The base is provided at the first slide groove and the second slide groove along the length direction thereof; The connecting portion of the first measuring member is slidably connected to the first sliding groove; The connecting portion of the second measuring piece can be slidably connected in the second sliding groove.

3. The inner and outer diameter measuring instrument according to claim 2, characterized in that: In the length direction of the base, the length of the first sliding groove is smaller than the length of the second sliding groove.

4. The inner and outer diameter measuring instrument according to claim 2, characterized in that: In the length direction of the base, a through hole is provided between the second inner wall of the first sliding groove away from the second sliding groove and the outer wall of the base, and the through hole is used for screwing in the knob.

5. The inner and outer diameter measuring instrument according to claim 4, characterized in that: When the knob cancels the pressure on the second elastic member along the length direction of the base, the second elastic member is partially accommodated in the through hole.

6. The inner and outer diameter measuring instrument according to claim 2, characterized in that: In the length direction of the base, a linear guide is also provided between the connecting portion of the first measuring piece and the first sliding groove.

7. The inner and outer diameter measuring instrument according to claim 1, characterized in that: The measuring part and the connecting part included in the first measuring piece and the second measuring piece are both detachably connected.

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