A device for detecting the smoothness of a shaft hole

Abstract

The utility model belongs to shaft hole detection technical field relates to a kind of shaft hole smoothness detection device, including casing, shaft, upper end cover, lower end cover, shaft plug cover, compensating piston, scale bar and tracheal joint and other components;Casing both ends are provided with end cap, center passes through the shaft to be measured, the one end of shaft passes out end cap and is provided shaft plug cover, and tracheal joint is communicated to the shaft hole on the shaft plug cover;Compensating piston is slidably arranged in the shaft hole, one end of compensating piston is connected with scale bar, and scale bar passes out shaft and is slidably arranged in shaft plug cover;Casing outer wall is provided with tracheal quick plug, and tracheal quick plug is communicated to casing inner cavity.The utility model realizes the quick, accurate evaluation to the surface quality of shaft hole by using non-contact pneumatic detection principle.

Description

Technical Field

[0001] This utility model relates to shaft inner hole detection technology, and in particular to a shaft inner hole smoothness detection device. Background Technology

[0002] In the field of wireless drilling slewing instrument manufacturing, the surface quality of the inner bore of the rotary valve pulse generator directly affects the stability of the pulse generator's signal transmission. The inner bore diameter of the rotary valve pulse generator is typically 8 mm, with a maximum depth of 210 mm. Traditional inspection methods mainly rely on contact measuring instruments and visual inspection, which have significant technical shortcomings: on the one hand, mechanical contact measurement is prone to causing secondary surface damage and cannot effectively assess the surface characteristics of deep hole areas (depth-to-diameter ratio > 5:1); on the other hand, existing pneumatic inspection devices are limited by the accuracy of air pressure control (±0.1 MPa) and the influence of ambient temperature fluctuations (±3℃), resulting in measurement repeatability errors as high as 20%, which seriously affects the judgment of process quality.

[0003] Furthermore, the following pain points still exist in the current application of technology in China: 1) More than 85% of enterprises still use manual plug gauge inspection, with an automation rate of less than 15%; 2) The purchase cost of imported equipment (such as the German Hommel profilometer) exceeds 2 million yuan per unit, and the maintenance cycle is as long as 6 weeks. Utility Model Content

[0004] To address the aforementioned challenges, this invention provides a shaft inner hole smoothness detection device that features a simple structure, high measurement accuracy, and low measurement cost.

[0005] The technical solution of this utility model is: a device for detecting the smoothness of the inner hole of a shaft, characterized in that: it includes a protective sleeve, a shaft, an upper end cover, a lower end cover, a shaft plug, a compensating piston, a scale rod, and an air pipe connector;

[0006] One end of the protective tube is provided with an upper end cap, and the other end of the protective tube is provided with a lower end cap. The center of the protective tube passes through a shaft. One end of the shaft is threaded into a blind hole provided in the inner end of the upper end cap, and the other end of the shaft passes through the lower end cap and is provided with a shaft plug at the passing end. An air pipe connector is provided on the shaft plug to connect to the inner hole of the shaft.

[0007] A compensating piston is slidably disposed inside the inner hole of the shaft. One end of the compensating piston is connected to a scale rod, which passes through the shaft and is slidably disposed in the through hole of the shaft plug.

[0008] Furthermore, both the upper end cover and the lower end cover are threadedly connected to the protective sleeve. The upper end cover has a blind hole in the middle of the end that penetrates the protective sleeve. An internal thread is provided in the blind hole, which is connected to the external thread of the shaft through the internal thread.

[0009] Furthermore, the shaft plug is threaded to one end of the shaft, the shaft plug has a central through hole, and the air pipe connector communicates with the inner hole of the shaft through the central through hole of the shaft plug.

[0010] Furthermore, a sealing copper gasket is provided on each side of the tracheal connector and is in contact with the shoulder of the shaft plug.

[0011] Furthermore, the end of the shaft plug away from the shaft has a groove, and a sealing ring is provided in the groove. The sealing ring is fixedly installed in the shaft plug by a screw, and the screw is threadedly connected to the shaft plug.

[0012] Furthermore, both the upper end cover and the lower end cover are provided with a second sealing ring, which seals the connection between the protective sleeve and the end cover; the lower end cover is provided with a third sealing ring, which seals the connection between the lower end cover and the shaft.

[0013] Furthermore, a quick-connect trachea plug is provided on the outer wall of the sleeve near the upper end cap, and the quick-connect trachea plug is connected to the inner cavity of the sleeve.

[0014] Compared with existing technologies, the beneficial effects of this utility model are as follows: The shaft inner hole smoothness detection device provided by this utility model adopts a non-contact detection principle through innovative design and achieves rapid and accurate assessment of the surface quality of the shaft inner hole through sophisticated air pressure control technology. Compared with traditional methods, the new technology exhibits three significant advantages: First, through the non-contact pneumatic sliding detection principle, the mapping relationship between piston movement speed (0.05-8mm / s) and dynamic friction coefficient can be quantitatively evaluated, completely avoiding mechanical contact during the detection process and fundamentally eliminating the risk of surface damage; Second, precise control of the input air pressure automates the detection process, greatly improving work efficiency; Third, the modular design supports rapid adaptation to Φ8-Φ12mm hole diameters, increasing detection efficiency by 400% compared to traditional methods; Finally, the measurement data is more objective and accurate, providing a reliable basis for process improvement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the appearance of a shaft inner hole smoothness detection device according to the present invention;

[0016] Figure 2 This is an internal structural diagram of a shaft inner hole smoothness detection device according to the present invention;

[0017] Figure 3 This is a structural diagram of the shaft structure of the shaft inner hole smoothness detection device of this utility model;

[0018] Figure 4 This is a schematic diagram of the compensating piston structure of a shaft inner hole smoothness detection device according to the present invention.

[0019] In the diagram: 1-Cylinder, 2-Shaft, 3-Upper end cover, 4-Lower end cover, 5-Shaft plug, 6-Compensating piston, 7-Scale rod, 8-Air pipe connector, 9-Sealing ring three, 10-Sealing ring two, 11-Sealing ring one, 12-Screw, 13-Sealing copper gasket, 14-Air pipe quick plug. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. However, those skilled in the art should know that the following embodiments are not the only limitation on the technical solution of the present invention. Any equivalent transformations or modifications made under the spirit and essence of the technical solution of the present invention should be considered as falling within the protection scope of the present invention.

[0021] This utility model provides a device for detecting the smoothness of the inner hole of a shaft, such as... Figure 1-4 As shown, the main components of the device include: a protective sleeve 1, a shaft 2, an upper end cover 3, a lower end cover 4, a shaft plug 5, a compensating piston 6, a scale rod 7, an air pipe connector 8, a sealing ring 3 9, a sealing ring 2 10, a sealing ring 11, a screw 12, a sealing copper gasket 13, and an air pipe quick plug 14.

[0022] In the device, shaft 2 is the object being measured. A protective sleeve 1 is fitted over the outer surface of shaft 2. One end of the protective sleeve 1 has an upper end cap 3, which is threaded to the protective sleeve 1. A blind hole with internal threads is located in the middle of the end of the upper end cap 3 that penetrates the protective sleeve 1. The shaft 2 has external threads at its end near the upper end cap 3, and the blind hole is threaded to the shaft 2. A lower end cap 4 is installed on the other end of the protective sleeve 1 and threaded to it. The lower end cap 4 has a central through hole, and the end of the shaft 2 furthest from the upper end cap 3 protrudes from the center of the lower end cap 4. A shaft plug 5 is located at the end of the shaft 2 that protrudes from the lower end cap 4.

[0023] The shaft plug 5 is threaded onto the end of the shaft 2 furthest from the casing 1. The shaft plug 5 extends into the inner bore of the shaft 2 and has a central through hole. An air pipe connector 8 is provided on the shaft plug 5, communicating with the central through hole, allowing gas to flow through and into the inner bore of the shaft 2. A sealing copper gasket 13 is provided on each side of the air pipe connector 8, contacting and connecting with the shaft shoulder of the shaft plug 5. All threaded seals are secured with PTFE tape wrapped around the threads and then tightened.

[0024] A compensating piston 6 is installed inside the shaft 2, and the compensating piston 6 is slidably installed in the inner hole of the shaft 2. A scale rod 7 is provided at one end of the compensating piston 6 and is threadedly connected to it. The scale rod 7 passes through the shaft 2 and the shaft plug 5. The scale rod 7 does not contact the inner hole of the shaft 2, but is slidably connected to the shaft plug 5.

[0025] The shaft 2 has a radial hole in the radial direction, which can connect the inner hole of the shaft 2 with the outside. In this device, the radial hole connects the inner hole of the shaft 2 with the inner cavity of the protective sleeve 1 for ventilation.

[0026] A quick-connect tracheal plug 14 is connected to the sleeve 1, and the quick-connect tracheal plug 14 is connected to the gap channel between the sleeve 1 and the shaft 2.

[0027] High-pressure air hoses are connected to the air hose connector 8 and the air hose quick plug 14. The other end of any one of the high-pressure air hoses is connected to the air pressure fine adjustment valve and the manual reversing valve. The two ends of the manual reversing valve are connected to the air hose quick plug 14 and the air hose connector 8 respectively through the high-pressure air hoses.

[0028] Sealing rings are installed at all structural locations that affect gas sealing. For example, a groove is provided at the end of the shaft plug 5 away from the shaft 2, and a sealing ring 11 is installed in the groove. The sealing ring 11 has a specification of φ3.15x1.8. The sealing ring 11 is fixedly installed in the shaft plug 5 by a screw 12. The screw 12 is threadedly connected to the shaft plug 5. The sealing ring 11 seals the gap between the shaft plug 5 and the scale rod 7, preventing gas leakage from the gas pipe connector 8 entering the inner cavity of the shaft plug 5.

[0029] Both the upper end cover 3 and the lower end cover 4 are equipped with a second sealing ring 10, which has a specification of φ23.6x2.65. The second sealing ring 10 seals the space between the protective sleeve 1 and the end cover, preventing gas leakage from the quick-connect plug 14 into the inner cavity of the protective sleeve 1. The lower end cover 4 is equipped with a third sealing ring 9, which has a specification of φ16x1.8. The third sealing ring 9 seals the gap between the lower end cover 4 and the shaft 2, preventing gas leakage from the inner cavity of the protective sleeve 1.

[0030] The working principle of this utility model is as follows: Shaft 2 is one of the components of the rotary valve pulse generator. When the rotary valve pulse generator is working downhole, it mainly balances the pressure difference between the outside and inside of the instrument by the back-and-forth sliding of the compensating piston 6 within shaft 2. When the smoothness of the inner hole of shaft 2 is poor, the sliding stroke of the compensating piston 6 is often restricted, resulting in an imbalance between the internal and external pressures of the instrument. Under the action of external pressure, shaft 2 will seize, causing the instrument to malfunction. This device mainly forms a circuit with two air inlet channels, air pipe connector 8 and air pipe quick plug 14, and external air pressure fine-tuning valve, manual reversing valve, and air source. When the manual reversing valve is turned to one side, air enters through air pipe connector 8, and compressed air drives the compensating piston 6 to slide from left to right (press...). Figure 2(As shown, it moves inwards towards the shaft), thereby causing the scale rod 7 to slide accordingly. Compressed gas flows through the radial hole of shaft 2 into the inner cavity of the protective sleeve 1, and then flows out through the quick-connect plug 14 of the air pipe. When the manual reversing valve is turned to the other side, air is released at the air pipe connector 8, and the compensating piston 6 will drive the scale rod 7 to slide from the right to the left under the action of air pressure. This process is repeated multiple times. By comparing the movement distance of the scale rod 7 before and after air is released, the travel distance of the compensating piston 6 within shaft 2 can be determined. By comparing the travel distance of the scale rod 7 within shaft 2, the smoothness of the inner hole of shaft 2 can be determined, thereby determining which shaft is qualified.

[0031] Although embodiments of the present invention have been shown and described above, it will be understood by those skilled in the art that various changes, modifications, substitutions or alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the smoothness of an inner hole in a shaft, characterized in that: Includes a protective sleeve (1), a shaft (2), an upper end cap (3), a lower end cap (4), a shaft plug (5), a compensating piston (6), a scale rod (7), and an air pipe connector (8); One end of the protective sleeve (1) is provided with an upper end cap (3), and the other end of the protective sleeve (1) is provided with a lower end cap (4). The center of the protective sleeve (1) passes through the shaft (2). One end of the shaft (2) is threaded into the blind hole provided in the inner end of the upper end cap (3). The other end of the shaft (2) passes through the lower end cap (4) and is provided with a shaft plug (5) at the passing end. An air pipe connector (8) is provided on the shaft plug (5) to connect to the inner hole of the shaft (2). A compensating piston (6) is slidably disposed inside the inner hole of the shaft (2). One end of the compensating piston (6) is connected to a scale rod (7). The scale rod (7) passes through the shaft (2) and is slidably disposed in the through hole of the shaft plug (5).

2. The shaft inner hole smoothness detection device according to claim 1, characterized in that: Both the upper end cover (3) and the lower end cover (4) are threadedly connected to the protective sleeve (1). The upper end cover (3) has a blind hole in the middle of the end that passes through the protective sleeve (1). The blind hole has an internal thread and is connected to the external thread of the shaft (2) through the internal thread.

3. The shaft inner hole smoothness detection device according to claim 1, characterized in that: The shaft plug (5) is threaded to one end of the shaft (2). The shaft plug (5) has a central through hole. The air pipe connector (8) communicates with the inner hole of the shaft (2) through the central through hole of the shaft plug (5).

4. The shaft inner hole smoothness detection device according to claim 1, characterized in that: The air pipe connector (8) is provided with a sealing copper gasket (13) on each side and is in contact with the shoulder of the shaft plug (5).

5. The shaft inner hole smoothness detection device according to claim 1, characterized in that: The shaft plug (5) has a groove at one end away from the shaft (2), and a sealing ring (11) is provided in the groove. The sealing ring (11) is fixedly installed in the shaft plug (5) by a screw (12), and the screw (12) is threadedly connected to the shaft plug (5).

6. The shaft inner hole smoothness detection device according to claim 1, characterized in that: Both the upper end cover (3) and the lower end cover (4) are provided with sealing rings two (10), which seal the sleeve (1) and the end cover; the lower end cover (4) is provided with sealing ring three (9), which seals the lower end cover (4) and the shaft (2).

7. The shaft inner hole smoothness detection device according to claim 1, characterized in that: The outer wall of the protective sleeve (1) near the upper end cover (3) is provided with a quick-connect trachea plug (14), which is connected to the inner cavity of the protective sleeve (1).

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