Device for measuring groove pitch of inner groove of bushing

Abstract

The utility model provides a bush inner groove pitch measuring device, which comprises a measuring piece and a steel ball, the measuring piece is sequentially provided with a small-end cylindrical part, a circular truncated cone part and a large-end cylindrical part from a small end to a large end, and the side surface of the circular truncated cone part of the measuring piece is used for supporting the steel ball, so that the steel ball is matched with the side surface of the circular truncated cone part to be clamped in an arc inner groove of a bush part to be measured. At the moment, the centers of the multiple steel balls are located on the same circumference, and the plane where the circumference is located is perpendicular to the central axis of the measuring piece. According to the utility model, the tool fixed by the steel ball is adopted, the problem that the related parameters of the inner groove of the pipe part are inconvenient to measure is indirectly solved by means of the mutual restriction of the side surface of the circular truncated cone part of the measuring piece, the steel ball and the arc-shaped inner groove of the bushing part to be measured, the detection efficiency is improved, and the use is simple and convenient. Meanwhile, the steel balls can detect whether the arc inner groove meets the standard or not, and by replacing the steel balls of different specifications, the device can be suitable for measuring the groove distances of the arc inner grooves of different specifications.

Description

Technical Field

[0001] The utility model belongs to the technical field of detection devices, and in particular relates to a device for measuring the groove distance of a bushing inner groove. Background Art

[0002] Generally, the measurement of the parameters related to the slot of a part will be done by calipers, vernier calipers, micrometers, three-coordinate measurement methods or by cutting the part to be measured. When measuring with a ruler, it must be kept perpendicular to the surface of the part to be measured, otherwise the operator may easily cause parameter measurement errors due to his own negligence; when measuring the size of the inner slot with a micrometer and three-coordinate measurement method, not only is the efficiency low, but it is also easy for the instrument to contact the part and cause wear of the instrument; when measuring by cutting the part, although the final measured data related to the inner slot is relatively accurate, it will cause waste of materials and increase cost expenditure.

[0003] Existing measuring tools are inconvenient, inefficient, and have large measurement errors when measuring the slot distance of pipe parts such as bushings. To solve the above problems, Chinese patent application number 201510093049.0 provides a part slot distance detection device that can accurately measure the slot distance of the part to be measured. However, the device has the disadvantages of complex structure and inconvenient operation. Utility Model Content

[0004] The utility model aims to solve the problems of complicated structure, inconvenient operation and large measurement error of the current measuring tool for measuring the groove distance, and provides a measuring device for the groove distance of the inner groove of the bushing.

[0005] To achieve the above purpose, the technical solution provided by the utility model is:

[0006] Provided is a measuring device for the groove pitch of a bushing inner groove, comprising: a measuring piece, which is provided with a small-end cylindrical portion, a truncated cone portion and a large-end cylindrical portion in sequence from the small end to the large end, the diameter of the large-end cylindrical portion is consistent with the diameter of the bottom surface of the truncated cone portion, the side surface of the large-end cylindrical portion and the inner wall of the bushing part to be measured are clearance-matched, and the small-end cylindrical portion is used for a measurer to hold; at least three steel balls are provided, and the diameter of the steel balls is the same as the groove width parameter of the circular arc inner groove of the bushing part to be measured; the side surface of the truncated cone portion of the measuring piece is used to support the steel balls, so that the steel balls fit with the side surface of the truncated cone portion and are clamped into the circular arc inner groove of the bushing part to be measured, and at this time, the centers of the multiple steel balls are on the same circumference, and the plane of the circumference is perpendicular to the central axis of the measuring piece.

[0007] Furthermore, the taper of the frustum of the measuring piece is set to 25-35°.

[0008] Furthermore, the clearance fit tolerance between the side surface of the large end cylindrical portion and the inner wall of the bushing part to be measured is 0.01 to 0.02 mm.

[0009] Furthermore, the measuring piece is manufactured by one-time clamping and processing, and the bottom surface of the large end cylindrical portion is perpendicular to the central axis of the truncated cone.

[0010] Furthermore, the steel balls are evenly distributed in the arc inner groove of the bushing part to be tested.

[0011] The advantages of the utility model are:

[0012] 1. The utility model adopts a tooling fixed with a steel ball, and the side surface of the truncated cone of the measuring piece, the steel ball and the arc-shaped inner groove of the bushing part to be measured are mutually constrained, which indirectly solves the problem that it is inconvenient to measure the relevant parameters of the inner groove of the bushing, effectively improves the inspection efficiency of the inspection personnel and the processing personnel, and is easy to carry and simple and convenient to use.

[0013] 2. When the steel ball fits tightly with the arc inner groove of the bushing part to be tested, it can be used to detect whether the arc inner groove meets the standard. By replacing steel balls of different specifications corresponding to arc inner grooves of various sizes, it can be applied to the measurement of the groove distance of arc inner grooves of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The features and advantages of the present invention will become more easily understood through the following description with reference to the accompanying drawings, which are not drawn to scale and some features are enlarged or reduced to show details of specific components. In the accompanying drawings:

[0015] Figure 1 It is a schematic diagram of the position relationship between the measuring device and the bushing part to be measured during measurement in the embodiment of the utility model;

[0016] Figure 2 It is an exploded schematic diagram of the measuring device in the embodiment of the utility model;

[0017] Figure 3 It is a main cross-sectional schematic diagram of the measuring device in the embodiment of the utility model;

[0018] Figure 4 It is a schematic diagram of the measuring principle of the measuring device in the embodiment of the utility model.

[0019] In the figure: 1- measuring piece; 11- small end cylindrical part; 12- frustum part; 13- large end cylindrical part; 2- steel ball; 3- bushing part to be measured. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings by means of exemplary embodiments of the present invention. It should be noted that the following detailed description of the present invention is only for the purpose of illustration, and is not intended to limit the present invention.

[0021] A measuring device for the inner groove pitch of a bushing, such as Figure 1As shown, it includes a measuring piece 1 and a steel ball 2.

[0022] like Figure 2 As shown, the measuring piece 1 is provided with a small end cylindrical portion 11, a truncated cone portion 12 and a large end cylindrical portion 13 from the small end to the large end. The diameter of the large end cylindrical portion 13 is consistent with the diameter of the lower bottom surface of the truncated cone portion 12. There is a clearance fit between the side surface of the large end cylindrical portion 13 and the inner wall of the bushing part 3 to be measured, and the fit tolerance is 0.01 to 0.02 mm. The small end cylindrical portion 11 is used to facilitate the measurer to hold the measuring device.

[0023] The measuring piece 1 is manufactured by one-time clamping. During manufacturing, it is necessary to ensure that the side surface of the truncated cone portion 12 of the measuring piece 1 is smooth so that the steel ball 2 can roll smoothly, and the bottom surface of the large end cylindrical portion 13 is perpendicular to the axis of the truncated cone portion 12, so as to ensure the accuracy of the final measurement data.

[0024] like Figure 3 As shown, there are four steel balls 2, and the diameter of the steel balls 2 is the same as the width parameter of the arc inner groove of the bushing part 3 to be measured.

[0025] The side surface of the truncated cone 12 of the measuring piece 1 is used to support the steel ball 2. When measuring, it can drive the steel ball 2 to slide into the arc inner groove of the bushing part 3 to be measured, so that the steel ball 2 and the side surface of the truncated cone 12 are matched and inserted into the arc inner groove of the bushing part 3 to be measured, and the four steel balls 2 are evenly distributed in the arc inner groove of the bushing part 3 to be measured. Figure 2 The center axis of the measuring piece 1 is arranged to coincide with the center axis of the bushing part 3 to be measured without deviation. At this time, the centers of the four steel balls 2 are on the same circumference, and the plane of the circumference is perpendicular to the center axis of the bushing part 3 to be measured, thereby improving the accuracy of the measuring device.

[0026] The taper of the conical portion 12 is 30°, and the difference between the diameter of the lower bottom surface of the conical portion 12 and the inner diameter of the bushing part 3 to be measured is very small. In this embodiment, the fitting tolerance between the side surface of the large end cylindrical portion 13 and the inner wall of the bushing part 3 to be measured is 0.001-0.002mm, so that the side surface of the conical portion 12 can not only drive the steel ball 2 to move into the arc inner groove, but also ensure that the steel ball 2 is tightly fitted with the arc inner groove and will not slip.

[0027] like Figure 4 As shown, the slot distance of the bushing part 3 to be tested is calculated according to the following formula:

[0028] L=L1+L2+L3

[0029] L1=R / sin30°

[0030] Among them, L represents the groove pitch of the arc inner groove of the bushing part 3 to be tested, L1 represents the distance from the center of the steel ball 2 to the lower bottom surface of the truncated cone part 12, L2 represents the height of the large end cylindrical part 13, L3 represents the distance between the lower bottom surface of the large end cylindrical part 13 and the lower bottom surface of the bushing part 3 to be tested, and R represents the radius of the steel ball 2.

[0031] The measuring device is used as follows:

[0032] 1. Place the lower surface of the bushing part 3 to be measured in contact with the plane. The operator holds the small end cylindrical part 11 of the measuring piece 1 and puts the measuring piece 1 into the bushing part 3 to be measured from the top. The large end cylindrical part 13 is in contact with the plane.

[0033] 2. Place the steel ball 2 between the side surface of the truncated cone 12 of the measuring piece 1 and the inner wall of the truncated cone 12 of the measuring piece 1 from above the bushing part 3 to be measured, and make the steel ball 2 evenly distributed on the side surface of the truncated cone 12 of the measuring piece 1 in the circumferential direction.

[0034] 3. The operator holds the small end cylindrical part 11 of the measuring piece 1 and pulls the measuring piece 1 upwards. The measuring piece 1 drives the steel ball 2 to move upwards until it is stuck in the arc inner groove of the bushing part 3 to be measured, and checks whether the position of the steel ball 2 is roughly evenly distributed in the arc inner groove. If not, it needs to be adjusted. Due to the side of the truncated cone part 12 and the force exerted by the operator on the small end cylindrical part 11, the steel ball 2 will fit firmly with the arc inner groove. You can manually apply force to the small end cylindrical part 11, or you can use other tools to assist.

[0035] 4. The operator uses a vernier caliper to measure the distance from the lower bottom surface of the large end cylindrical portion 13 to the lower bottom surface of the bushing part 3 to be measured, which is L3 in the above formula. The operator can also use a vernier caliper to measure the distance from the upper bottom surface of the truncated cone portion 12 to the upper bottom surface of the bushing part 3 to be measured. Since the height of the bushing part 3 to be measured, the height of the truncated cone portion 12, and the height of the large end cylindrical portion 13 are all known, the distance from the lower bottom surface of the large end cylindrical portion 13 to the lower bottom surface of the bushing part 3 to be measured can be indirectly calculated.

[0036] 5. According to the above formula, calculate the distance from the arc inner groove to the bottom surface of the bushing part 3 to be tested, that is, the groove distance L of the arc inner groove of the bushing part 3 to be tested.

[0037] The measuring device designed by the utility model has no requirements on the environment and location. In terms of measurement, it effectively solves the problem that it is inconvenient to measure individual parameters of the inner groove of the part and unnecessary cost waste in the measurement process. The principle of the device is clear and the accuracy is high. The measuring device is small in size and easy to carry. The measurement is convenient, simple and fast, which can greatly improve the detection efficiency of the inner groove distance of bushings and similar pipe parts.

[0038] Finally, it should be noted that the features mentioned and / or shown in the above description of the exemplary embodiments of the utility model can be combined in the same or similar manner into one or more other embodiments, combined with the features in other embodiments or replace the corresponding features in other implementations. The technical solutions obtained by these combinations or replacements should also be deemed to be included in the protection scope of the utility model.

Claims

1. A device for measuring the groove pitch of a bushing, characterized in that: include: The measuring piece is provided with a small end cylindrical part, a truncated cone part and a large end cylindrical part in sequence from the small end to the large end. The diameter of the large end cylindrical part is consistent with the diameter of the bottom surface of the truncated cone part. There is a clearance fit between the side surface of the large end cylindrical part and the inner wall of the bushing part to be measured. The small end cylindrical part is used for the measurer to hold; There are at least three steel balls, the diameter of which is the same as the width of the circular arc inner groove of the bushing part to be tested; Among them, the side surface of the truncated cone of the measuring piece is used to support the steel ball so that the steel ball and the side surface of the truncated cone can fit into the arc inner groove of the bushing part to be measured. At this time, the centers of multiple steel balls are on the same circumference, and the plane of the circumference is perpendicular to the central axis of the measuring piece.

2. A measuring device for the inner groove pitch of a bushing according to claim 1, characterized in that: The taper of the truncated cone of the measuring piece is set to 25 to 35 degrees.

3. A measuring device for the inner groove pitch of a bushing according to claim 1, characterized in that: The clearance fit tolerance between the side surface of the large end cylindrical portion and the inner wall of the bushing part to be tested is 0.01 to 0.02 mm.

4. A measuring device for the inner groove pitch of a bushing according to claim 1, characterized in that: The measuring piece is manufactured by one-time clamping and processing, and the bottom surface of the large end cylindrical part is perpendicular to the central axis of the truncated table.

5. The device for measuring the inner groove pitch of a bushing according to claim 1, characterized in that: The steel balls are evenly distributed in the arc inner groove of the bushing part to be tested.

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