Three-needle measuring device

Abstract

The utility model provides a three-pin measuring device, which is used for measuring the pitch diameter of a thread of an external thread part and comprises a base, a first flexible pad, a plug screw, a thread sleeve, a three-pin positioning plate and three measuring pins. An installation hole is formed in the upper portion of the base in the vertical direction, the first flexible pad is installed at the bottom of the installation hole, and first internal threads are arranged in the installation hole. The screw plug is provided with a first external thread matched with the first internal thread, and the screw plug is mounted in the mounting hole; a second external thread matched with the second internal thread is arranged at the upper part of the outer side wall of the base; the three-needle positioning plate is installed at the upper end of the threaded sleeve in the direction parallel to the first flexible pad, and a plurality of fixing holes are formed in the three-needle positioning plate. The first flexible base plate is provided with a first through hole, and the lower ends of the three measuring needles sequentially penetrate through the fixing holes and the first through hole. The three-pin measuring device designed by the utility model can quickly and conveniently complete the positioning of the three measuring pins, and effectively solves the problem that the measuring pins are difficult to fix when the pitch diameter of a thread is measured.

Description

Technical Field

[0001] This utility model belongs to the field of thread pitch diameter measurement technology, specifically relating to a three-needle measuring device. Background Technology

[0002] Currently, the pitch diameter of external threaded parts is generally measured using thread ring gauges or a three-point measuring method. However, for parts with pitch diameter tolerance requirements, accurate pitch diameter values ​​cannot be obtained solely through thread ring gauge measurements. Furthermore, thread ring gauges are prone to wear and mis-detection due to the large number of parts being inspected. Additionally, some specialized threads in certain industries require custom-made thread ring gauges for measurement, which are costly and time-consuming. The three-point measuring method is an indirect and simplified method for measuring pitch diameter, reducing measurement errors by increasing the number of measurement points. It also offers high accuracy, wide applicability, and low cost.

[0003] Currently, Chinese patent CN2771812Y discloses an auxiliary tooling for measuring worm gear pitch using three needles. This device uses front and rear centers to support the worm, adds left and right clamping blocks on both sides of the worm gear, and sets three needle holes on the clamping blocks to hold measuring needles for measurement; however, it is complex and time-consuming to operate. Another Chinese patent CN106124960A discloses a portable three-needle conductive silicon material measuring device, which replaces mechanical measurement with electrical signal measurement; however, it requires one hand to simultaneously fix the three needles and the other hand to fix the part, which is complex, requires a lot of practice to master, and has low measurement efficiency. Utility Model Content

[0004] The purpose of this invention is to solve the problems of complex operation, inaccurate positioning, and low measurement efficiency of existing three-needle measuring devices, and to provide a three-needle measuring device.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A three-needle measuring device for measuring the pitch diameter of an externally threaded part includes a base, a first flexible pad, a screw plug, a screw sleeve, a three-needle positioning plate, and three measuring needles. The base has a vertical mounting hole on its upper part, and the first flexible pad is installed at the bottom of the mounting hole, which has a first internal thread. The screw plug has a first external thread that matches the first internal thread and is installed in the mounting hole to fix the first flexible pad within it. The screw sleeve has a second internal thread, and the upper part of the outer side wall of the base has a second external thread that mates with the second internal thread. The three-needle positioning plate is installed on the upper end of the screw sleeve in a direction parallel to the first flexible pad, and has multiple fixing holes. The first flexible pad has a first through hole, and the lower ends of the three measuring needles pass through the fixing holes and the first through hole sequentially.

[0007] Furthermore, a second flexible pad is installed on the upper end of the base, and a second groove for placing the second flexible pad is provided on the inner wall of the screw sleeve.

[0008] Furthermore, the upper edge of the threaded sleeve is provided with two V-blocks for placing the externally threaded parts being tested.

[0009] Furthermore, the upper end of the screw sleeve is provided with a first groove for mounting the three-pin positioning plate.

[0010] Furthermore, the fixing hole and the measuring needle are fitted with a clearance.

[0011] Furthermore, both the first flexible pad and the second flexible pad are composite silicone rubber sheets.

[0012] Furthermore, a clearance zone is provided in the middle of the base to allow the three measuring needles to pass.

[0013] The advantages of this utility model are:

[0014] The three-needle measuring device designed in this utility model, through the setting of a three-needle positioning plate, a first flexible pad, a base, and a screw sleeve, can quickly and conveniently complete the positioning of the three measuring needles, effectively solving the problem of difficult fixing of measuring needles when measuring the mean diameter of threads; the measurement operation of this three-needle measuring device is simple and convenient, which can effectively improve the measurement efficiency, and the structure is simple and lightweight. Attached Figure Description

[0015] The features and advantages of this invention will become more readily understood from 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 parts.

[0016] Figure 1 This is a schematic diagram of the structure of the three-needle measuring device in an embodiment of this utility model;

[0017] Figure 2 This is a schematic front cross-sectional view of the three-needle measuring device in an embodiment of this utility model;

[0018] Figure 3 This is a top view of the three-needle measuring device in an embodiment of this utility model;

[0019] Figure 4 This is an exploded schematic diagram of the three-needle measuring device in an embodiment of this utility model.

[0020] In the diagram: 1-base; 2-first flexible pad; 3-screw plug; 4-second flexible pad; 5-screw sleeve; 6-three-needle positioning plate; 7-measuring needle; 8-part. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments thereof. It should be noted that the following detailed description of the present invention is for illustrative purposes only and is not intended to limit the scope of the invention.

[0022] A three-needle measuring device is used to measure the thread pitch diameter of an external threaded part 8, such as... Figure 1 , 2 As shown, the device includes a base 1, a first flexible pad 2, a screw plug 3, a screw sleeve 5, a three-needle positioning plate 6, and three measuring needles 7. The base 1 has a vertical mounting hole on its upper part. The first flexible pad 2 is installed at the bottom of the mounting hole, which has a first internal thread. The screw plug 3 has a first external thread that matches the first internal thread and is installed in the mounting hole to fix the first flexible pad 2 within it. The screw sleeve 5 has a second internal thread, and the upper part of the outer wall of the base 1 has a second external thread that mates with the second internal thread. The upper end of the screw sleeve 5 has a first groove for mounting the three-needle positioning plate 6. The three-needle positioning plate 6 is installed in the first groove in a direction parallel to the first flexible pad 2, and has multiple fixing holes. The first flexible pad 2 has a first through hole, and the lower ends of the three measuring needles 7 pass through the fixing holes and the first through hole sequentially. The fixing holes and the measuring needles 7 are fitted with a large clearance.

[0023] like Figure 2 , 4 As shown, a second flexible pad 4 is installed on the upper end of the base 1, and a second groove is provided on the inner wall of the screw sleeve 5 for placing the second flexible pad 4. Adding the second flexible pad enables two-point positioning of each needle of the measuring needle 7, making it less prone to tilting. Both the first flexible pad 2 and the second flexible pad 4 are composite silicone rubber sheets. The first flexible pad 2 and the second flexible pad 4 can be pre-drilled with holes through which the measuring needle 7 passes. This is suitable for measuring the pitch of the external threads of a batch of parts 8 of the same specification. To measure another batch of parts 8 of different specifications, the first flexible pad 2 and the second flexible pad 4 can be replaced. Alternatively, the first flexible pad 2 and the second flexible pad 4 can be inserted without special drilling; force can be applied to penetrate both the first flexible pad 2 and the second flexible pad 4.

[0024] like Figure 1 As shown, the upper edge of the threaded sleeve 5 is provided with two V-blocks for placing the externally threaded part 8 to be tested. The V-blocks not only support the part 8 to be tested, but also enable the part 8 to automatically align its axis.

[0025] like Figure 2 As shown, a clearance area is provided in the middle of the base 1 to allow the three measuring needles 7 to pass through the first flexible pad 2.

[0026] Instructions for use: According to the required thread size, select the corresponding hole on the three-needle positioning plate 6. Pass the lower ends of the three measuring needles 7 through the three-needle positioning plate 6, and then sequentially through the second flexible pad 4 and the first flexible pad 2. Place the three-needle measuring device on a table. Figure 3 As shown, the screw of the part to be tested 8 is placed between the three measuring needles 7, with the thread of the screw in contact with the three measuring needles 7. Automatic initial positioning is achieved using the weight of the part 8 itself. Then, a micrometer is used to measure and obtain the reading M. Throughout the measurement process, after the initial positioning of the three measuring needles 7, the operator does not need to manually hold the measuring needles 7. The upper part of the measuring needles 7 has an open structure, facilitating the insertion and removal of the part to be tested 8. The operation is simple and convenient, significantly improving measurement efficiency.

[0027] When measuring other threads, simply remove the measuring pin 7, select the corresponding hole on the three-pin positioning plate 6, and insert the penetrating second flexible pad 4 and first flexible pad 2 to achieve three-pin positioning. It is convenient, efficient, and easy to carry.

[0028] Finally, it should be noted that the features mentioned and / or shown in the above description of exemplary embodiments of the present invention can be combined in the same or similar manner with one or more other embodiments, combined with features in other embodiments, or substituted for corresponding features in other embodiments. These combined or substituted technical solutions should also be considered as included within the protection scope of the present invention.

Claims

1. A three-needle measuring device for measuring the pitch diameter of an externally threaded part, characterized in that, It includes a base, a first flexible pad, a screw plug, a screw sleeve, a three-needle positioning plate, and three measuring needles; The upper part of the base is provided with a mounting hole along the vertical direction, the first flexible pad is installed at the bottom of the mounting hole, and the mounting hole is provided with a first internal thread; The plug has a first external thread that matches the first internal thread, and the plug is installed in the mounting hole to fix the first flexible pad in the mounting hole. The screw sleeve has a second internal thread, and the upper part of the outer side wall of the base is provided with a second external thread that mates with the second internal thread; The three-needle positioning plate is installed on the upper end of the screw sleeve in a direction parallel to the first flexible pad. The three-needle positioning plate is provided with a plurality of fixing holes. The first flexible pad is provided with a first through hole, and the lower ends of the three measuring needles pass through the fixing hole and the first through hole in sequence.

2. The three-needle measuring device according to claim 1, characterized in that, A second flexible pad is installed on the upper end of the base, and a second groove for placing the second flexible pad is provided on the inner wall of the screw sleeve.

3. The three-needle measuring device according to claim 1, characterized in that, The upper edge of the threaded sleeve is provided with two V-shaped blocks for placing the external threaded parts to be tested.

4. The three-needle measuring device according to claim 1, characterized in that, The upper end of the threaded sleeve is provided with a first groove for mounting the three-pin positioning plate.

5. The three-needle measuring device according to claim 1, characterized in that, The fixing hole is clearance-fitted with the measuring needle.

6. The three-needle measuring device according to claim 2, characterized in that, Both the first flexible pad and the second flexible pad are composite silicone rubber sheets.

7. The three-needle measuring device according to claim 1, characterized in that, The base has a clearance zone in the middle to allow the three measuring needles to pass.

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