Thread engagement length measuring instrument

Abstract

A thread engagement length measuring instrument provided by the present invention comprises a U-shaped ruler frame, a U-shaped measuring anvil and a measuring rod, the ruler frame is provided with a first ruler arm and a second ruler arm, the measuring anvil is provided with a first anvil arm and a second anvil arm, the first ruler arm is fixedly connected with a sleeve, the sleeve is in threaded connection with a micrometric screw, the second ruler arm is in sliding fit connection with the measuring rod, and the surface of the measuring rod is provided with a reference thread. The first anvil arm and the second anvil arm are both connected with the ruler frame in a sliding fit mode, the first anvil arm and the micrometric screw are opposite to each other, and the second anvil arm and the measuring rod are opposite to each other. According to the technical scheme, firstly, the corresponding measuring rod is selected according to the diameter of the thread, and during measurement, the measuring rod is completely meshed with the inner hole thread and then is locked, so that the measuring rod can accurately distinguish the boundary between the bottom hole and the thread, the measurement of the length of the inner hole thread is transferred from the inside of the hole to the outside of the hole, measurement personnel can read readings conveniently, and the measurement efficiency is improved. The measurement precision is improved, and the measurement data is real and reliable.

Description

Technical Field

[0001] The present invention belongs to the technical field of measuring devices, and particularly relates to a measuring instrument for the meshing length of threads. Background Art

[0002] In the manufacturing field, in order to ensure the manufacturing quality of parts, it is necessary to measure various shape element features of the parts. When measuring the depth of the inner hole of a part, the prior art mainly uses the following two methods for measurement: One method is that the operator holds a depth gauge for measurement. On the one hand, since the internal space of the deep cavity of the part is very limited. On the other hand, the operator completely relies on his own work experience to judge the direction of the handheld depth gauge and the relative position between the depth gauge and the workpiece to be measured. When the operator's hand shakes, it is easy to have a large measurement error, the measurement accuracy is low, and the reliability of the measurement result is poor; Another method is to use a coordinate measuring machine for indirect measurement. This measurement method requires the operator to have quite proficient instrument operation skills and excellent measurement skills, and also requires a large amount of calculation on the measurement results to obtain the final measurement result. The measurement operation time is long, the work efficiency is low, and the current price of the coordinate measuring machine is not cheap, and most small and medium-sized manufacturing enterprises cannot afford it.

[0003] In the prior art, a patent document with the publication number of "CN220794110U" discloses a depth measuring device, including a measuring tool, a slider, a probe, a support plate and a support arm. The upper end of the support arm is fixedly connected to the support plate, the lower end of the support arm extends vertically downward, a chute is provided on the surface of the support plate, the measuring tool includes a ruler frame and a measuring rod, the ruler frame is fixedly connected to the slider, the slider is sleeved in the chute, the upper end of the probe is fixedly connected to the measuring rod, and the lower end of the probe extends vertically downward. Adopting the technical solution of this patent makes the measurement operation have a unified measurement reference, reduces the measurement error, and improves the measurement accuracy. However, when measuring the length of the internal thread in a hole, on the one hand, due to insufficient light in the hole, the measurement personnel cannot accurately read the value; on the other hand, the measurement personnel cannot distinguish the boundary between the internal bottom hole and the thread, and can only measure the depth of the bottom hole, and then judge the length of the thread based on the depth of the bottom hole by experience. The measurement accuracy is not high, and the authenticity of the measurement data is relatively low. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a measuring instrument for the meshing length of threads.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a measuring instrument for the thread engagement length, which includes a U-shaped ruler frame, a U-shaped anvil and a measuring rod. The ruler frame has a first ruler arm and a second ruler arm. The anvil has a first anvil arm and a second anvil arm. The first ruler arm is fixedly connected to a sleeve, and the sleeve is screwed to a micrometer screw. The second ruler arm is slidably connected to the measuring rod. A reference thread is provided on the surface of the measuring rod. Both the first anvil arm and the second anvil arm are slidably connected to the ruler frame, and the first anvil arm and the micrometer screw are disposed opposite to each other, and the second anvil arm and the measuring rod are disposed opposite to each other.

[0007] The micrometer screw is also fixedly connected to a main knob, and the main knob is also fixedly connected to a thimble. The sleeve is sleeved inside the thimble. A plurality of main scale lines are further provided on the surface of the sleeve, and the main scale lines are arranged at equal intervals along the axial direction of the sleeve. A plurality of sub-scale lines are further provided on the outer circumferential surface of the thimble, and the sub-scale lines are arranged at equal intervals along the circumferential direction of the thimble.

[0008] A zero baseline is further provided on the surface of the sleeve. The zero baseline is consistent with the axial direction of the sleeve, and the main scale lines are perpendicular to and intersect with the zero baseline.

[0009] The distance between any two adjacent main scale lines is 1 mm.

[0010] The number of the sub-scale lines is 50.

[0011] The micrometer screw is also screwed to a fine adjustment knob.

[0012] The ruler frame is also screwed to a lock. The lock is used to lock the relative positions between the ruler frame and the axial directions of the micrometer screw, the first anvil arm, the second anvil arm and the measuring rod.

[0013] The lock can be replaced by a hexagon bolt.

[0014] The beneficial effects of the present invention are as follows: By adopting the technical solution of the present invention, first, the anvil is pushed to the rightmost end, and then the micrometer screw is abutted against the first anvil arm to complete zeroing. Then, according to the diameter of the thread to be measured, a corresponding measuring rod is selected. After connecting the measuring rod to the internal hole thread, the lock is used to lock the relative position between the ruler frame and the axial direction of the measuring rod. Then, the anvil is pulled to make the second anvil arm abut against the measuring rod, and the main knob is rotated to make the micrometer screw abut against the first anvil arm, and then the length of the internal hole thread can be read. Since during the measurement, after the measuring rod is completely engaged with the internal hole thread and locked, the measuring rod can accurately distinguish the boundary between the bottom hole and the thread, transfer the measurement of the length of the internal hole thread from inside the hole to outside the hole, making it convenient for the measurement personnel to read the indication, improving the measurement accuracy, and the measurement data is true and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the front view of the present invention;

[0016] Figure 2 is a schematic structural diagram of the zero point when using the present invention;

[0017] Figure 3 is a schematic structural diagram after the measuring rod is threadedly connected to the inner hole thread when measuring using the present invention;

[0018] Figure 4 is a schematic structural diagram when measuring and reading the thread length indication using the present invention.

[0019] In the figure: 1 - measuring frame, 2 - anvil, 3 - measuring rod, 4 - first scale arm, 5 - second scale arm, 6 - first anvil arm, 7 - second anvil arm, 8 - sleeve, 9 - micrometer screw, 10 - main knob, 11 - thimble, 12 - main scale line, 13 - sub - scale line, 14 - zero baseline, 15 - fine - tuning knob, 16 - stopper. Detailed implementation manners

[0020] The technical solution of the present invention will be further described below, but the scope of protection is not limited thereto.

[0021] As Figures 1 to 4 shown, the present invention provides a measuring instrument for the meshing length of a thread, including a U - shaped measuring frame 1, a U - shaped anvil 2 and a measuring rod 3. The measuring frame 1 has a first scale arm 4 and a second scale arm 5. The anvil 2 has a first anvil arm 6 and a second anvil arm 7. The first scale arm 4 is fixedly connected to a sleeve 8, and the sleeve 8 is threadedly connected to a micrometer screw 9. The second scale arm 5 is slidably and cooperatively connected to the measuring rod 3. The surface of the measuring rod 3 is provided with a reference thread. Both the first anvil arm 6 and the second anvil arm 7 are slidably and cooperatively connected to the measuring frame 1, and the first anvil arm 6 and the micrometer screw 9 are opposed to each other, and the second anvil arm 7 and the measuring rod 3 are opposed to each other.

[0022] Adopting the technical solution of the present invention, first, the anvil is pushed to the rightmost end, then the micrometer screw is abutted against the first anvil arm to complete zeroing. Then, according to the diameter of the thread to be measured, a corresponding measuring rod is selected. After the measuring rod is threadedly connected to the inner hole thread, the relative position between the measuring frame and the measuring rod axially is locked using the stopper. Then, the anvil is pulled to make the second anvil arm abut against the measuring rod, and the main knob is rotated to make the micrometer screw abut against the first anvil arm, and then the length of the inner hole thread can be read. Since during the measurement, after the measuring rod is fully meshed with the inner hole thread and locked, the measuring rod can accurately distinguish the boundary between the bottom hole and the thread, transferring the measurement of the inner hole thread length from inside the hole to outside the hole, making it convenient for the measurer to read the indication, improving the measurement accuracy, and the measurement data being true and reliable.

[0023] Specifically, the micrometer screw 9 is also fixedly connected to the main knob 10, and the main knob 10 is also fixedly connected to the thimble 11. The sleeve 8 is sleeved inside the thimble 11. A plurality of main scale lines 12 are provided on the surface of the sleeve 8, and the main scale lines 12 are arranged at equal intervals along the axial direction of the sleeve 8. A plurality of secondary scale lines 13 are provided on the outer peripheral surface of the thimble 11, and the secondary scale lines 13 are arranged at equal intervals along the circumferential direction of the thimble 11. The main scale lines 12 are also sequentially marked with natural numbers along the axial direction of the sleeve 8. When the first anvil arm 6 is set at the rightmost side and the micrometer screw 9 abuts against the first anvil arm 6, the edge of the thimble 11 is aligned with the main scale line 12 marked "0" on the sleeve 8, realizing the "zeroing" operation of the main scale line of the present invention.

[0024] In addition, a zero baseline 14 is provided on the surface of the sleeve 8. The zero baseline 14 is consistent with the axial direction of the sleeve 8, and the main scale line 12 is perpendicular to and intersects the zero baseline 14. The secondary scale lines 13 are also sequentially marked with natural numbers along the circumferential direction of the thimble 11. When the first anvil arm 6 is set at the rightmost side and the micrometer screw 9 abuts against the first anvil arm 6, the zero baseline 14 is also aligned with the secondary scale line 13 marked "0" on the thimble 11.

[0025] Furthermore, preferably, the distance between any two adjacent main scale lines 12 is 1 mm. The number of secondary scale lines 13 is 50. The micrometer screw 9 is also screwed to the fine adjustment knob 15. The frame 1 is also screwed to the lock 16, and the lock 16 is used to lock the relative positions between the frame 1 and the axial directions of the micrometer screw 9, the first anvil arm 6, the second anvil arm 7, and the measuring rod 3. Preferably, the lock 16 can be replaced by a hexagon bolt.

Claims

1. A measuring instrument for the thread engagement length, characterized in that: It includes a U-shaped frame (1), a U-shaped anvil (2) and a measuring rod (3). The frame (1) has a first arm (4) and a second arm (5). The anvil (2) has a first anvil arm (6) and a second anvil arm (7). The first arm (4) is fixedly connected to a sleeve (8). The sleeve (8) is screwed to a micrometer screw (9). The second arm (5) is slidably and cooperatively connected to the measuring rod (3). The surface of the measuring rod (3) is provided with a reference thread. The first anvil arm (6) and the second anvil arm (7) are both slidably and cooperatively connected to the frame (1), and the first anvil arm (6) and the micrometer screw (9) are opposed to each other, and the second anvil arm (7) and the measuring rod (3) are opposed to each other.

2. The thread engagement length measuring instrument according to claim 1, wherein: The micrometer screw (9) is also fixedly connected to a main knob (10). The main knob (10) is also fixedly connected to a differential cylinder (11). The sleeve (8) is sleeved inside the differential cylinder (11). The surface of the sleeve (8) is also provided with a number of main scale lines (12), and the main scale lines (12) are arranged at equal intervals along the axial direction of the sleeve (8). The outer peripheral surface of the differential cylinder (11) is also provided with a number of sub-scale lines (13), and the sub-scale lines (13) are arranged at equal intervals along the circumferential direction of the differential cylinder (11).

3. The thread engagement length measuring instrument according to claim 2, characterized in that: The surface of the sleeve (8) is also provided with a zero baseline (14). The zero baseline (14) is consistent with the axial direction of the sleeve (8), and the main scale lines (12) are perpendicular to and intersect with the zero baseline (14).

4. The thread engagement length measuring instrument according to claim 2 or 3, characterized in that: The spacing between any two adjacent main scale lines (12) is 1 mm.

5. The thread engagement length measuring instrument according to claim 2, wherein: The number of the sub-scale lines (13) is 50.

6. The thread engagement length measuring instrument according to claim 2, characterized in that: The micrometer screw (9) is also screwed to a fine adjustment knob (15).

7. The thread engagement length measuring instrument according to claim 1 or 6, characterized in that: The frame (1) is also screwed to a lock (16). The lock (16) is used to lock the relative positions between the frame (1) and the axial directions of the micrometer screw (9), the first anvil arm (6), the second anvil arm (7) and the measuring rod (3).

8. The thread engagement length measuring instrument according to claim 7, characterized in that: The lock (16) can be replaced by a hexagon bolt.

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