Micrometer

Abstract

The utility model provides a micrometer, and belongs to the technical field of measuring instruments. The problem that a micrometer in the prior art cannot accurately measure the outer diameter of a wide-pitch part is solved. The micrometer comprises a micrometer frame, a measuring anvil and a micrometric screw, the measuring anvil and the micrometric screw are oppositely arranged on the micrometer frame, the micrometer frame is further provided with a positioning bracket, the positioning bracket is located below the measuring anvil and located between the measuring anvil and the micrometric screw, and the measuring anvil and the positioning bracket are both in a long strip shape and intersect with the micrometer frame. And the positioning bracket can move and be locked along the horizontal direction relative to the ruler frame. According to the utility model, the problem that the conventional micrometer cannot accurately measure the outer diameter of a wide-pitch part can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of measuring instruments and relates to a micrometer. Background Art

[0002] A micrometer is a more precise tool for measuring length than a vernier caliper. For example, a Chinese patent document discloses a multifunctional micrometer (application number: 201420513038.4). The micrometer has a frame. The frame has an anvil at one end and a micrometer screw at the other end. The micrometer screw can move closer to or farther away from the anvil. The frame is covered by a heat shield. The heat shield has a first anti-slip part. Preferably, the first anti-slip part has a plurality of protrusions.

[0003] The following deficiencies exist in the use of this micrometer: When the side wall of the part to be measured has an external thread and the pitch of the thread is greater than the diameter of the anvil of the micrometer, during measurement, since the thread teeth are arranged in a spiral shape, the anvil and the micrometer screw on the frame of the micrometer cannot simultaneously abut against the thread teeth on the outer side wall of the part. That is, when the micrometer screw abuts against the thread teeth, the anvil will be embedded in the thread groove and the outer diameter of the part to be measured cannot be accurately measured. Summary of the Invention

[0004] The purpose of the utility model is to provide a micrometer that can accurately measure the outer diameter of a part with a wide pitch in view of the above problems existing in the prior art. The technical problem to be solved by the utility model is to solve the problem that the existing micrometer cannot accurately measure the outer diameter of a part with a wide pitch.

[0005] The purpose of the utility model can be achieved by the following technical solutions:

[0006] A micrometer includes a frame, an anvil and a micrometer screw oppositely arranged on the frame. It is characterized in that a positioning bracket is further arranged on the frame. The positioning bracket is located below the anvil and between the anvil and the micrometer screw. Both the anvil and the positioning bracket are strip-shaped and are respectively arranged intersecting with the frame. And the positioning bracket can move horizontally relative to the frame and be locked.

[0007] When measuring a screw with a wide pitch, the user only needs to place the screw on the anvil support of the micrometer, and then adjust the position of the positioning bracket so that the anvil and the positioning bracket can simultaneously abut against two adjacent threads of the screw. Then, adjust the position of the micrometer screw until it abuts against one of the two threads of the screw. Since both the anvil and the positioning bracket are strip-shaped, and the two ends of the anvil and the positioning bracket are respectively located on both sides of the positioning bracket, this micrometer can avoid the anvil being embedded in the groove between two adjacent threads, so that the anvil, the positioning bracket and the micrometer screw simultaneously abut against the outer wall of the screw to form a three-point positioning measurement. Finally, the user reads the measurement value on the micrometer to obtain the outer diameter of the screw, thus solving the problem that the existing micrometer cannot accurately measure the outer diameter of parts with a wide pitch.

[0008] In the above-mentioned micrometer, the anvil support has a mounting groove with a notch facing the micrometer screw. The anvil is embedded in the mounting groove, and a corrugated spring is connected between the anvil and the bottom wall of the mounting groove. There is a first movement gap between the anvil and both side walls of the mounting groove. By setting the corrugated spring and the first movement gap, on the one hand, the position of the anvil can be self-adjusted, so that the anvil can better abut against the side wall of the screw and avoid being embedded in the groove between two adjacent threads. On the other hand, when measuring a tapered part, by shaking the micrometer back and forth, the anvil can abut against the side wall of the screw again, which is very convenient to use.

[0009] In the above-mentioned micrometer, a positioning post is inserted through the anvil. Positioning grooves for the two end parts of the positioning post to be embedded are respectively formed on the two side walls of the mounting groove. There is a second movement gap between the positioning post and the bottom walls of the two positioning grooves. The positioning post can improve the connection reliability between the anvil and the support. At the same time, by setting the second movement gap, it is ensured that the anvil can be self-adjusted in position under the action of the corrugated spring, so that the anvil can better abut against the side wall of the screw and also avoid damaging the surface of the part due to hard contact.

[0010] In the above-mentioned micrometer, the positioning bracket is provided with an adjusting screw. The adjusting screw is movably inserted through the anvil support. A spring is inserted through the adjusting screw, and the two ends of the spring are respectively connected to the positioning bracket and the anvil support. A locking nut is arranged at the end of the adjusting screw extending out of the anvil support and away from the positioning bracket. After the position of the positioning bracket is adjusted in place, the locking nut can lock the position of the positioning bracket, and the spring enables the position of the positioning bracket to be self-adjusted, so that the positioning bracket can better abut against the side wall of the screw.

[0011] In the above-mentioned micrometer, the positioning bracket further has a positioning rod that is parallel and adjacent to the adjusting screw rod. The positioning rod is movably embedded in the frame. The positioning rod can play a role in guiding and limiting the movement of the positioning bracket relative to the frame, making the position adjustment of the positioning bracket more accurate. At the same time, it also enables the positioning bracket to better abut against the surface of the measured part and can avoid damaging the surface of the part due to hard contact.

[0012] In the above-mentioned micrometer, both ends of the positioning bracket are arc-shaped. The above structure enables both ends of the positioning bracket to avoid having sharp corners.

[0013] In the above-mentioned micrometer, an auxiliary anvil is provided at the end of the micrometer screw. The auxiliary anvil is arranged opposite to the anvil. By providing the auxiliary anvil, the micrometer screw can better abut against the surface of the measured part, improving the measurement accuracy of the outer diameter of the part.

[0014] In the above-mentioned micrometer, the center connection lines of the anvil, the positioning bracket, and the auxiliary anvil form a triangle. The above structure enables the anvil, the positioning bracket, and the auxiliary anvil to simultaneously and stably abut against the side wall of the measured part, ensuring the measurement accuracy of the outer diameter of the part.

[0015] Compared with the prior art, the advantages of this micrometer are as follows: The anvil, the positioning bracket, and the auxiliary anvil of this micrometer can simultaneously abut against the outer side wall of the screw rod to form three-point positioning measurement. At the same time, the wave spring and the spring can respectively make the positions of the anvil and the positioning bracket self-adjust. When the outer diameter of the part has a taper, this micrometer can still perform outer diameter measurement, and at the same time, the anvil and the positioning bracket can better simultaneously abut against the outer side wall of the screw rod, thus solving the problem that the prior art micrometer cannot accurately measure the outer diameter of parts with a wide pitch. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is one of the structural schematic diagrams of this micrometer.

[0017] Figure 2 is the second structural schematic diagram of this micrometer.

[0018] In the figure, 1, frame; 1a, installation groove; 1b, positioning groove; 2, anvil; 3, micrometer screw; 4, positioning bracket; 4a, adjusting screw rod; 4b, positioning rod; 5, wave spring; 6, moving gap one; 7, positioning column; 8, moving gap two; 9, spring; 10, locking nut; 11, auxiliary anvil. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following are specific embodiments of the present invention and in combination with the attached drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0020] A micrometer, referring to Figure 1-2 , includes a frame 1, an anvil 2 and a micrometer screw 3 oppositely arranged on the frame 1. A positioning bracket 4 is further arranged on the frame 1. The positioning bracket 4 is located below the anvil 2 and between the anvil 2 and the micrometer screw 3. Both the anvil 2 and the positioning bracket 4 are strip-shaped and are respectively arranged intersecting with the frame 1, and the positioning bracket 4 can move horizontally relative to the frame 1 and be locked.

[0021] Specifically, referring to Figure 1-2 , the frame 1 has a mounting groove 1a with a notch facing the micrometer screw 3. The anvil 2 is embedded in the mounting groove 1a. A corrugated spring 5 is connected between the anvil 2 and the bottom wall of the mounting groove 1a. There is a first moving gap 6 between the anvil 2 and the two side walls of the mounting groove 1a; further, a positioning post 7 is penetrated through the anvil 2. Positioning grooves 1b for embedding the two end parts of the positioning post 7 are respectively formed on the two side walls of the mounting groove 1a. There is a second moving gap 8 between the positioning post 7 and the bottom walls of the two positioning grooves 1b.

[0022] Specifically, referring to Figure 1-2 , the positioning bracket 4 has an adjusting screw 4a. The adjusting screw 4a is movably penetrated through the frame 1. A spring 9 is penetrated through the adjusting screw 4a. The two ends of the spring 9 are respectively connected to the positioning bracket 4 and the frame 1. A locking nut 10 is arranged at the end of the adjusting screw 4a extending out of the frame 1 and away from the positioning bracket 4; further, a positioning rod 4b parallel and adjacent to the adjusting screw 4a is further arranged on the positioning bracket 4. The positioning rod 4b is movably embedded in the frame 1. In this embodiment, it is preferred that the two ends of the positioning bracket 4 are arc-shaped.

[0023] Further, referring to Figure 1-2 , an auxiliary anvil 11 is arranged at the end of the micrometer screw 3. The auxiliary anvil 11 is oppositely arranged to the anvil 2; the axis connection lines of the anvil 2, the positioning bracket 4 and the auxiliary anvil 11 form a triangle.

[0024] The working principle of this micrometer is described below:

[0025] In use, for example, when measuring a screw with a wide pitch, first clean the spindle and anvil 2, auxiliary anvil 11 and positioning bracket 4 of the micrometer. Then, zero the micrometer. Subsequently, the user places the screw in the U-shaped groove of the micrometer frame 1. At the same time, make the anvil 2 and the positioning bracket 4 of this micrometer abut against two adjacent threads of the screw. On the one hand, the wave spring 5 enables the position of the anvil 2 to be self-adjusted, so that the anvil 2 can better abut against the side wall of the screw, and it can avoid the anvil 2 being embedded in the groove between two adjacent threads. On the other hand, when measuring a tapered part, by shaking the micrometer back and forth, the anvil 2 can be made to abut against the side wall of the screw again, which is very convenient to use. The spring 9 enables the position of the positioning bracket 4 to be self-adjusted, so that the positioning bracket 4 can better abut against the side wall of the screw, and further enables the anvil 2 and the positioning bracket 4 to simultaneously abut against the outer side wall of the screw. Then, the user rotates the force measuring ratchet at the end of the micrometer, making the micrometer screw 3 gradually approach the screw until the auxiliary anvil 11 on the micrometer screw 3 abuts against one of the above two threads (when hearing three "click, click, click", the auxiliary anvil 11 abuts against the screw). At this time, the anvil 2, positioning bracket 4 and auxiliary anvil 11 of this micrometer simultaneously abut against the outer side wall of the screw to form a three-point positioning measurement. At this time, the user operates the locking device to lock the position of the measuring screw 3, and then the user can read the measurement value on the micrometer.

[0026] It should be noted that the micrometer in this embodiment is not provided with a digital display device and is a mechanical micrometer. Micrometer reading = main scale reading of the fixed sleeve + reading on the differential cylinder. Each grid of the main scale of the fixed sleeve is 1 mm, and each grid of the differential cylinder is 0.01 mm. When reading, pay attention to keeping the line of sight perpendicular to the scale. If the 0.5 mm scale line of the main scale of the sleeve and the front edge of the differential cylinder are in a situation of seemingly pressing but not pressing, it should be determined whether it is included in the reading according to the reading on the differential cylinder. If the reading on the differential cylinder is greater than or equal to 0, it is included in the reading, otherwise it is not included in the reading.

[0027] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A micrometer, comprising a frame (1), an anvil (2) and a micrometer screw (3) oppositely arranged on the frame (1), characterized in that, A positioning bracket (4) is further provided on the frame (1). The positioning bracket (4) is located below the anvil (2) and between the anvil (2) and the micrometer screw (3). Both the anvil (2) and the positioning bracket (4) are strip-shaped and are respectively arranged intersecting with the frame (1), and the positioning bracket (4) can move horizontally relative to the frame (1) and be locked.

2. A micrometer according to claim 1, wherein, An installation groove (1a) with a notch facing the micrometer screw (3) is provided on the frame (1). The anvil (2) is embedded in the installation groove (1a). A corrugated spring (5) is connected between the anvil (2) and the bottom wall of the installation groove (1a). There is a first movement gap (6) between the anvil (2) and the two side walls of the installation groove (1a).

3. A micrometer according to claim 2, characterized in that, A positioning column (7) is penetrated through the anvil (2). Positioning grooves (1b) for embedding the two end portions of the positioning column (7) are respectively formed on the two side walls of the installation groove (1a). There is a second movement gap (8) between the positioning column (7) and the bottom walls of the two positioning grooves (1b).

4. A micrometer according to claim 1 or 2 or 3, characterized in that, An adjusting screw (4a) is provided on the positioning bracket (4). The adjusting screw (4a) is movably penetrated through the frame (1). A spring (9) is penetrated through the adjusting screw (4a). The two ends of the spring (9) are respectively connected to the positioning bracket (4) and the frame (1). A locking nut (10) is arranged at the end of the adjusting screw (4a) extending out of the frame (1) and away from the positioning bracket (4).

5. A micrometer according to claim 4, characterized in that, A positioning rod (4b) parallel and adjacent to the adjusting screw (4a) is further provided on the positioning bracket (4). The positioning rod (4b) is movably embedded in the frame (1).

6. A micrometer according to claim 4, characterized in that, Both ends of the positioning bracket (4) are arc-shaped.

7. A micrometer according to claim 1 or 2 or 3, characterized in that, An auxiliary anvil (11) is provided at the end of the micrometer screw (3). The auxiliary anvil (11) is arranged opposite to the anvil (2).

8. A micrometer according to claim 7, characterized in that, The axial center connection lines of the anvil (2), the positioning bracket (4) and the auxiliary anvil (11) form a triangle.

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