Detection tool for diameter of inner cavity of deep hole

Abstract

The utility model discloses a testing fixture for the diameter of an inner cavity of a deep hole. The testing fixture comprises a base, a testing fixture mechanism arranged on the base, and a zero calibration device arranged on the base, the gauge mechanism comprises a body, a first lever mechanism arranged on the body, a second lever mechanism arranged on the body, balls arranged on the first lever mechanism and the second lever mechanism, a first dial indicator connected with the first lever mechanism, and a second dial indicator connected with the second lever mechanism. The first lever mechanism is connected with the body through a first liquid needle, the body is pressed on the base in an interference fit mode, the zero calibration device is installed on the base, and second liquid needles are further arranged on the sides, away from the first dial indicator and the second dial indicator, of the first lever mechanism and the second lever mechanism. And the front ends of probes of the first dial gauge and the second dial gauge penetrate through the lever on the other side and are respectively contacted with the second liquid needle. The device has the advantages of being simple in structure, simple and easy to operate, capable of saving inspection time and high in accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of measurement, in particular to a measuring tool for measuring the inner diameter of a deep hole. Background Art

[0002] Currently, the main means of measuring diameters include digital vernier calipers, internal micrometers, and Zeiss CMMs. The common point of these three measurement methods is that the measured data is the actual size. However, their use also has limitations: digital vernier calipers cannot measure the diameter of deep holes with multiple steps; internal micrometers are used to measure inner diameters with high precision, but cannot measure outer diameters, and can only measure diameters within specified specifications. If the diameters of multiple parts of a workpiece vary greatly, multiple internal micrometers are required; Zeiss CMM measurement is cumbersome and inefficient, and is only suitable for dimensional measurement in the early stages of product production and for first and last piece inspection, and is not suitable for daily workshop production.

[0003] In view of the above situation, it is necessary to improve the existing deep hole inner cavity detection method so that it can adapt to the current needs of deep hole inner cavity detection. Utility Model Content

[0004] The technical solution of the present invention to achieve the above-mentioned purpose is to provide a deep hole inner cavity diameter gauge, comprising a base, a gauge mechanism arranged on the base, and a zeroing device arranged on the base; the gauge mechanism comprises a body, a first lever mechanism arranged on the body, a second lever mechanism arranged on the body, a ball arranged on the first lever mechanism and the second lever mechanism, a first micrometer connected to the first lever mechanism, and a second micrometer connected to the second lever mechanism; the first lever mechanism is connected to the body through a first liquid needle, and the body is press-fitted on the base through an interference fit; a second liquid needle is further provided on the first lever mechanism and the second lever mechanism on a side away from the first micrometer and the second micrometer; the second liquid needle passes through one side lever and the body and is fixed to the first lever mechanism and the second lever mechanism by a fastening nut; the front ends of the probes of the first micrometer and the second micrometer pass through the lever on the other side and contact the second liquid needle respectively; the zeroing device is installed on the base.

[0005] As a further supplement to the present technical solution, the base includes a bottom plate, feet arranged around the bottom plate, and a positioning sleeve arranged in the middle of the top plate. The upper end of the foot is fixedly connected to the lower surface of the bottom plate, and the positioning sleeve is fixedly installed on the bottom plate. Four windows and four threaded holes are provided on the side of the positioning sleeve for installing the first micrometer, the second micrometer, and the second liquid needle. The main body and the positioning sleeve are interference fit and are pressed onto the positioning sleeve.

[0006] To further supplement the present technical solution, the first lever mechanism includes first levers arranged on the left and right, the first levers on both sides are connected to the main body through adjusting screws, the first lever is connected to the main body through a first liquid needle, a limit groove is provided on the main body in a direction perpendicular to the first liquid needle for the first liquid needle to move, the second liquid needle is connected to the first lever through a fastening nut, and balls are provided on the first levers arranged on the left and right, and the structure of the second lever mechanism is the same as that of the first lever mechanism.

[0007] As a further supplement to the technical solution, the heights of the first lever mechanism and the second lever mechanism are determined according to the measurement position of the workpiece and the bottom heights thereof should maintain a movable distance of 15-30 mm from the bottom plate.

[0008] To further supplement the present technical solution, a reset mechanism is further provided between the first lever mechanism, the second lever mechanism and the main body, the reset mechanism including a reset spring and a fixing screw connected to the reset spring, a step hole is provided on the first lever, the spring is installed in the step hole and fixed by a fixing screw, one end of the spring is fixedly connected to the main body, and the other end of the spring is sleeved on the fixing screw and fixedly connected to it.

[0009] As a further supplement to the technical solution, a movable gap of 1-3 mm is maintained between the first lever and the body.

[0010] As a further supplement to the present technical solution, the ball is fixed to the first lever and the second lever by welding; the initial opening distance L between the two first levers, that is, the distance between the two balls, is controlled by rotating the adjusting screw, and the measured inner diameter L is greater than the upper tolerance limit, and the measured outer diameter L is less than the lower tolerance limit.

[0011] As a further supplement to the technical solution, the zero calibration device includes a calibration part and a placement sleeve, and the placement sleeve is fixedly installed on the base plate.

[0012] Its beneficial effect is that it uses the lever principle and micrometer to perform measurements. The inspection device has a simple structure, is easy to operate, saves inspection time, can measure the diameter of the inner cavity of complex deep holes, and is monitored by a micrometer with high accuracy, making it easy to monitor the quality of workpieces on the production site. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the utility model from a first angle;

[0014] Figure 2 This is a second angle overall structural diagram of the utility model;

[0015] Figure 3 It is a schematic cross-sectional structural diagram of the present utility model;

[0016] Figure 4 It is a cross-sectional structural diagram of the utility model for placing and correcting parts;

[0017] In the figure, 1. base; 11. bottom plate; 12. foot; 13. positioning sleeve; 2. inspection fixture mechanism; 21. body; 22. first lever mechanism; 221. first lever; 222. adjusting screw; 23. second lever mechanism; 24. ball bearing; 25. first micrometer; 26. second micrometer; 3. zeroing device; 31. calibration part; 32. placement sleeve; 4. first liquid needle; 5. second liquid needle; 6. reset mechanism; 61. reset spring; 62. fixing screw. DETAILED DESCRIPTION

[0018] In order to make the technical solution more clear to those skilled in the art, Figure 1 -4 Detailed description of the technical solution of this utility model:

[0019] A deep hole inner cavity diameter gauge, comprising a base 1, a gauge mechanism 2 disposed on the base 1, and a zero calibration device 3 disposed on the base 1; the gauge mechanism 2 comprises a body 21, a first lever mechanism 22 disposed on the body 21, a second lever mechanism 23 disposed on the body 21, a ball 24 disposed on the first lever mechanism 22 and the second lever mechanism 23, a first micrometer 25 connected to the first lever mechanism 22, and a second micrometer 26 connected to the second lever mechanism 23; wherein the ball 24 is fixed to the first lever 221 and the second lever by welding; the first lever mechanism 2 2 is connected to the main body 21 via a first liquid needle 4, which is press-fitted onto the base 1 via an interference fit. A second liquid needle 5 is also provided on the side of the first and second lever mechanisms 22 and 23, away from the first and second micrometers 25 and 26. The second liquid needle 5 passes through the lever and main body 21 on one side and is secured to the first and second lever mechanisms 22 and 23 via a fastening nut. The tips of the probes of the first and second micrometers 25 and 26 pass through the lever on the other side and respectively contact the second liquid needle 5, exerting force on the contact. A ball 24 contacts the workpiece, with its orientation determined by the measurement position. Changes in the position of the ball 24 drive changes in the position of the second liquid needle 5 and the micrometer probe via the lever, resulting in changes in the micrometer data. A zero calibration device 3 is mounted on the base 1.

[0020] The structure of the base 1 will be described in detail below. The base 1 includes a base plate 11, base feet 12 arranged around the bottom of the base plate 11, and a positioning sleeve 13 arranged in the middle above the base plate 11. The upper end of the base foot 12 is fixedly connected to the lower surface of the base plate 11, and the positioning sleeve 13 is fixedly installed on the base plate 11. Four windows and four threaded holes are provided on the side of the positioning sleeve 13 for installing the first micrometer 25, the second micrometer 26, and the second liquid needle 5. The body 21 and the positioning sleeve 13 are interference fit and are pressed onto the positioning sleeve 13.

[0021] The structure of the first lever mechanism 22 will be described in detail below. The first lever mechanism 22 includes left and right first levers 221, each connected to the main body 21 via an adjusting screw 222. The first lever 221 is connected to the main body 21 via a first liquid needle 4. A limit groove is provided on the main body 21 perpendicular to the first liquid needle 4 for movement of the first liquid needle 4. The second liquid needle 5 is connected to the first lever 221 via a fastening nut. Balls 24 are provided on each of the left and right first levers 221. The structure of the second lever mechanism 23 is identical to that of the first lever mechanism 22. The height of the first and second lever mechanisms 22 and 23 is determined based on the measurement position of the workpiece, and the bottom height of each lever mechanism maintains a movable distance of 15-30 mm from the base plate 11. A movable clearance of 1-3 mm is maintained between the first lever 221 and the main body 21. The initial opening distance L between the two first levers 221, i.e., the distance between the two balls 24, is controlled by rotating the adjusting screw 222. The measured inner diameter L is greater than the upper tolerance limit, and the measured outer diameter L is less than the lower tolerance limit.

[0022] Among them, a reset mechanism 6 is also provided between the first lever mechanism 22, the second lever mechanism 23 and the main body 21. The reset mechanism 6 includes a reset spring 61 and a fixing screw 62 connected to the reset spring 61. A step hole is opened on the first lever 221. The spring is installed in the step hole and fixed by the fixing screw 62. One end of the spring is fixedly connected to the main body 21, and the other end of the spring is sleeved on the fixing screw 62 and fixedly connected to it, which can control the reset of the first lever 221 and the second lever.

[0023] The structure of the zero calibration device 3 will be described in detail below. The zero calibration device 3 includes a calibration part 31 and a placement sleeve 32. The placement sleeve 32 is fixedly mounted on the base plate 11. Before use, the zero calibration should be performed with the calibration part 31. Then, the workpiece to be measured should be placed on the inspection fixture. The micrometer reading should be observed. If it is within the range of ±0.01mm, it is qualified.

[0024] The above technical solutions only reflect the preferred technical solutions of the present utility model. Any changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the present utility model and fall within the scope of protection of the present utility model.

Claims

1. A deep hole inner cavity diameter measuring tool, characterized in that: The invention comprises a base (1), a check fixture mechanism (2) arranged on the base (1), and a zero calibration device (3) arranged on the base (1); the check fixture mechanism (2) comprises a body (21), a first lever mechanism (22) arranged on the body (21), a second lever mechanism (23) arranged on the body (21), a ball (24) arranged on the first lever mechanism (22) and the second lever mechanism (23), a first micrometer (25) connected to the first lever mechanism (22), and a second micrometer (26) connected to the second lever mechanism (23); the first lever mechanism (22) is connected to the body through a first liquid needle (4). (21) is connected, the body (21) is press-fitted on the base (1) by interference fit, and a second liquid needle (5) is further provided on the first lever mechanism (22) and the second lever mechanism (23) on a side away from the first micrometer (25) and the second micrometer (26), the second liquid needle (5) passes through the lever and the body (21) on one side and is fixed to the first lever mechanism (22) and the second lever mechanism (23) by a fastening nut, the front ends of the probes of the first micrometer (25) and the second micrometer (26) pass through the lever on the other side and are in contact with the second liquid needle (5) respectively, and the zero calibration device (3) is installed on the base (1).

2. A deep hole inner cavity diameter measuring tool according to claim 1, characterized in that: The base (1) comprises a bottom plate (11), feet (12) arranged around the bottom of the bottom plate (11), and a positioning sleeve (13) arranged in the middle of the top of the bottom plate (11). The upper end of the feet (12) is fixedly connected to the lower surface of the bottom plate (11). The positioning sleeve (13) is fixedly installed on the bottom plate (11). Four windows and four threaded holes are opened on the side of the positioning sleeve (13) for installing a first micrometer (25), a second micrometer (26), and a second liquid needle (5). The body (21) and the positioning sleeve (13) are interference fit and are press-fitted onto the positioning sleeve (13).

3. A deep hole inner cavity diameter measuring tool according to claim 2, characterized in that: The first lever mechanism (22) includes left and right first levers (221), the first levers (221) on both sides are connected to the body (21) through adjusting screws (222), the first lever (221) is connected to the body (21) through a first liquid needle (4), a limiting groove is provided on the body (21) in a direction perpendicular to the first liquid needle (4) for the first liquid needle (4) to move, the second liquid needle (5) is connected to the first lever (221) through a fastening nut, and a ball (24) is provided on each of the left and right first levers (221), and the structure of the second lever mechanism (23) is the same as that of the first lever (221) mechanism (22).

4. A deep hole inner cavity diameter measuring tool according to claim 3, characterized in that: The heights of the first lever mechanism (22) and the second lever mechanism (23) are determined according to the measurement position of the workpiece, and the bottom heights thereof are required to maintain a movable distance of 15-30 mm from the bottom plate (11).

5. A deep hole inner cavity diameter measuring tool according to claim 4, characterized in that: A reset mechanism (6) is further provided between the first lever mechanism (22), the second lever mechanism (23) and the body (21). The reset mechanism (6) comprises a reset spring (61) and a fixing screw (62) connected to the reset spring (61). A step hole is provided on the first lever (221). The spring is installed in the step hole and fixed by the fixing screw (62). One end of the spring is fixedly connected to the body (21), and the other end of the spring is sleeved on the fixing screw (62) and fixedly connected thereto.

6. A deep hole inner cavity diameter measuring tool according to claim 3, characterized in that: A movable gap of 1-3 mm is maintained between the first lever (221) and the body (21).

7. A deep hole inner cavity diameter measuring tool according to claim 3, characterized in that: The ball (24) is fixed to the first lever (221) and the second lever by welding; the initial opening distance L between the two first levers (221), that is, the distance between the two balls (24), is controlled by rotating the adjusting screw (222); the measured inner diameter L is greater than the upper tolerance limit, and the measured outer diameter L is less than the lower tolerance limit.

8. A deep hole inner cavity diameter measuring tool according to claim 1, characterized in that: The zero calibration device (3) comprises a calibration part (31) and a placement sleeve (32), and the placement sleeve (32) is fixedly mounted on the base plate (11).

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