Thread effective depth detection device

Abstract

The utility model relates to the technical field of measuring tool detection, and provides a thread effective depth detection device which comprises a handle, a digital display meter, a displacement sensor, a connecting rod and a detachable plug gauge. The handle is slidably connected with the connecting rod through a through hole in the end. The end part of the connecting rod is in threaded connection with a detachable plug gauge; a rectangular digital display meter is embedded in the middle of the surface of the handle; a displacement sensor is embedded in the surface edge of the handle in the axial direction of the handle. According to the utility model, depth measurement of different threaded holes is realized by replacing different detachable thread plug gauges; the number of effective thread turns can be automatically calculated through the digital display value of the digital display meter and the automatically input thread pitch value, and the detection efficiency can be remarkably improved.

Description

Technical Field

[0001] The utility model relates to a thread effective depth detection device, belonging to the technical field of measuring tool detection. Background Art

[0002] The effective depth detection of threads is an important indicator to ensure the strength verification of threaded connections. As the quality management specifications for aerospace products become more stringent, space product applications have mandatory requirements for the depth of thread engagement. Generally, the stop end is not allowed to be screwed in 2 turns, and the through end must be ensured to have a sufficient depth of entry. The effective depth of the threaded fastener connection directly affects the product quality and the strength of the entire machine. Especially in recent years, with the improvement of machining precision, various precision instruments have gradually developed in the direction of miniaturization and micro-miniaturization, and the diameter of fasteners such as screws has also gradually decreased. The Chinese utility model patent with patent number CN201920776928.7 discloses a thread detection gauge, a detection device, and a thread detection device, which can detect threads by using a through gauge and a stop gauge in turn.

[0003] However, the inventor of the utility model found that the existing technology has the following problems: the current method for detecting the effective depth of the thread is to first measure the length of the thread plug gauge, then insert the thread plug gauge into the threaded hole and use a height gauge to measure the length of the thread plug gauge to determine the effective depth, and then divide it by the lead to determine the number of turns, which is extremely inefficient. In addition, there are many thread plug gauges, which need to be inspected regularly, and the rust-proof storage and management are also troublesome, so improvements are needed. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a thread effective depth detection device, which can solve the problems of low efficiency of existing thread effective depth and multiple types of plug gauges that are stored unchanged.

[0005] The utility model is realized through the following technical solutions.

[0006] The utility model provides a thread effective depth detection device, comprising a handle, a digital display, a displacement sensor, a connecting rod and a detachable plug gauge; the handle is slidably connected to the connecting rod through a through hole at the end; the connecting rod end is threadedly connected with a detachable plug gauge; a rectangular digital display is inlaid in the middle of the handle surface; a displacement sensor is inlaid on the edge of the handle surface along the axial direction of the handle; the handle is in an arc shape with a large diameter in the middle and a gradually decreasing diameter along the axis, and a boss is provided at one end of the handle, a through hole is provided on the end face of the boss, and a cylindrical space is provided inside the handle; the displacement sensor is in an elongated rod shape, and a paddle is radially provided on the surface of the displacement sensor toward the inner cavity of the handle; the connecting rod is in an elongated rod shape in the middle, a large disc is provided at one end, a small disc is provided at the other end, and a threaded countersunk hole is provided on the end face of the small disc.

[0007] An annular groove is arranged on the outer surface of the large disc, and the annular groove is engaged with the paddle.

[0008] The diameter of the large disc is 3 / 4 of the diameter of the inner cavity of the handle and is twice the diameter of the small disc.

[0009] The connecting rod moves axially along the through hole on the end surface of the boss and also rotates around its own axis.

[0010] The moving speed of the connecting rod does not exceed 5 mm / s.

[0011] The measuring range of the digital display is 0-50mm.

[0012] The number of turns of the detachable plug gauge screwed into the thread satisfies S=H / P, where S represents the number of turns screwed in, S is the display value of the digital display, and P is the lead of the known thread.

[0013] The beneficial effects of the utility model are: by replacing different detachable thread plug gauges, the depth measurement of different threaded holes can be realized; through the digital display value of the digital display meter and the automatically input pitch value, the effective number of thread turns can be automatically calculated, which can significantly improve the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 yes Figure 1 sectional view of .

[0016] In the figure: 1-handle, 11-boss, 2-digital display, 3-displacement sensor, 31-paddle, 4-connecting rod, 41-large disc, 42-annular groove, 43-small disc, 5-detachable plug gauge. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is further described below, but the scope of protection required is not limited to the description.

[0018] The utility model relates to Figure 1-2The device for detecting effective thread depth shown in the figure comprises a handle 1, a digital display 2, a displacement sensor 3, a connecting rod 4 and a detachable plug gauge 5; the handle 1 is slidably connected to the connecting rod 4 through a through hole at the end; the end of the connecting rod 4 is threadedly connected with a detachable plug gauge 5; a rectangular digital display 2 is inlaid in the middle of the surface of the handle 1; the displacement sensor 3 is inlaid on the edge of the surface of the handle 1 along the axial direction of the handle 1; the handle 1 is in the shape of an arc with a large diameter in the middle and a gradually decreasing diameter along the axis, and a boss 11 is provided at one end of the handle 1, a through hole is provided on the end face of the boss 11, and a cylindrical hollow is provided inside the handle 1 The displacement sensor 3 is in the shape of an elongated rod, and a paddle 31 is radially provided on the surface of the displacement sensor 3 toward the inner cavity of the handle 1; the connecting rod 4 is in the shape of an elongated rod in the middle, and a large disc 41 is provided at one end, and a small disc 43 is provided at the other end, and a threaded countersunk hole is provided on the end face of the small disc 43; the handle 1 is used for positioning and straightening, and is convenient for operation; the digital display 2 displays the detection value of the displacement sensor 3 in the form of data through signal conversion; the displacement sensor 3 is used to detect the screw-in depth relative to the initial position; the connecting rod 4 is a connecting piece between the displacement sensor 3 and the detachable plug gauge 5.

[0019] The second embodiment of the utility model is basically the same as the first embodiment, mainly in further optimization. An annular groove 42 is provided on the outer surface of the large disc 41 to ensure that the connecting rod 4 can always maintain connection with the paddle 31 during its own rotation, and the annular groove 42 is engaged with the paddle 31; the paddle 31 can convert the rotational motion of the detachable plug gauge 5 into its own linear motion.

[0020] The diameter of the large disk 41 is 3 / 4 of the inner diameter of the handle 1 to ensure that the annular groove 42 can be provided with sufficient depth, and is twice the diameter of the small disk 43 to avoid interference with surrounding parts during the screwing of the detachable plug gauge 5.

[0021] The connecting rod 4 moves axially along the through hole at the end face of the boss 11 and also rotates around its own axis. The length of the through hole at the end face of the boss 11 is at least 3 times the diameter of the connecting rod 4 to prevent the connecting rod 4 from being stuck during the movement.

[0022] The moving speed of the connecting rod 4 does not exceed 5 mm / s, in order to ensure the stability of the detection process of the displacement sensor 3 and to ensure the detection accuracy.

[0023] The measuring range of the digital display gauge 2 is 0-50mm, and the depth of the detachable plug gauge 5 can only be detected within this range. If it exceeds the range, there will be errors, which may seriously damage the digital display gauge 2.

[0024] The number of turns of the removable plug gauge 5 screwed into the thread satisfies S=H / P, where S represents the number of turns screwed in, S is the display value of the digital display gauge 2, and P is the lead of the known thread. The lead is an inherent parameter of the thread. The lead of the removable plug gauge 5 must be consistent with the lead of the thread to be tested.

[0025] Based on this, a typical working process of the utility model is:

[0026] When the utility model is implemented, Figure 1-2 As shown, first fix the detachable plug gauge 5 in the threaded hole at the end of the boss 11 of the connecting rod 4, return the digital display 2 to zero, rotate the connecting rod 4, and the detachable plug gauge 5 penetrates into the threaded hole by the thread teeth engagement. While the connecting rod 5 rotates itself, it will push the paddle 31 on the displacement sensor 3 to make a linear motion through the annular groove 42; when the thread is screwed into the bottom end, read the reading, and then input the lead value according to the program S=H / P=10 / 1.5 to get the number of turns screwed in.

Claims

1. A thread effective depth detection device, characterized in that: The invention comprises a handle (1), a digital display (2), a displacement sensor (3), a connecting rod (4) and a detachable plug gauge (5); the handle (1) is slidably connected to the connecting rod (4) through a through hole at the end; the end of the connecting rod (4) is threadedly connected with the detachable plug gauge (5); a rectangular digital display (2) is inlaid in the middle of the surface of the handle (1); the displacement sensor (3) is inlaid on the edge of the surface of the handle (1) along the axial direction of the handle (1); the handle (1) is in the shape of an arc with a large diameter in the middle and a gradually decreasing diameter along the axis, and a boss (11) is provided at one end of the handle (1), a through hole is provided at the end surface of the boss (11), and a cylindrical space is provided inside the handle (1); the displacement sensor (3) is in the shape of a slender rod, and a paddle (31) is provided on the surface of the displacement sensor (3) in a radial direction toward the inner cavity of the handle (1); the connecting rod (4) is in the shape of a slender rod in the middle, and a large disc (41) is provided at one end, and a small disc (43) is provided at the other end, and a threaded countersunk hole is provided on the end surface of the small disc (43).

2. The thread effective depth detection device according to claim 1, characterized in that: An annular groove (42) is provided on the outer surface of the large disc (41), and the annular groove (42) is engaged with the paddle (31).

3. The thread effective depth detection device according to claim 2, characterized in that: The diameter of the large disc (41) is 3 / 4 of the diameter of the inner cavity of the handle (1), and is twice the diameter of the small disc (43).

4. The thread effective depth detection device according to claim 1, characterized in that: The connecting rod (4) moves axially along the through hole on the end surface of the boss (11) and also rotates around its own axis.

5. The thread effective depth detection device according to claim 4, characterized in that: The moving speed of the connecting rod (4) does not exceed 5 mm / s.

6. The thread effective depth detection device according to claim 1, characterized in that: The measuring range of the digital display meter (2) is 0-50 mm.

7. The thread effective depth detection device according to claim 1, characterized in that: The number of turns of the detachable plug gauge (5) screwed into the thread satisfies S=H / P, where S represents the number of turns screwed in, S is the display value of the digital indicator (2), and P is the lead of the known thread.

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