A large multi-head trapezoidal internal thread pitch diameter measuring device

Abstract

The utility model relates to a large -scale multi -head trapezoidal internal thread pitch diameter measuring device, the utility model discloses a first pitch diameter measuring head and second pitch diameter measuring head are arranged to inner diameter micrometer, one end of first pitch diameter measuring head is provided with first measuring ball, and the other end is connected with inner diameter micrometer, one end of second pitch diameter measuring head is provided with second measuring ball, and the other end is connected with inner diameter micrometer. The utility model has simple measuring method, high measuring efficiency, low production cost, novel structure and the like characteristics, strong adaptability can be used for measuring the multi -head trapezoidal internal thread of different diameter, different pitch, especially suitable for the high -efficient accurate measurement of thread pitch diameter in large -diameter multi -head trapezoidal internal thread production.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing technology, and in particular relates to the accurate measurement of the pitch diameter of large multi-start trapezoidal internal threads, specifically to a device for measuring the pitch diameter of large multi-start trapezoidal internal threads. Background Technology

[0002] Impellers and cutterheads are important components of deep-water dredging vessels used to extract sand and gravel from the seabed. They are mainly connected by large multi-start trapezoidal threads (e.g., Tr640x240-P60 threads), which require very high precision in the fit of the multi-start threads. Therefore, the accurate pitch diameter of the multi-start trapezoidal threads must be measured during machining.

[0003] Existing methods for measuring large, multi-start trapezoidal internal threads mainly include thread template trial assembly and thread profile template measurement. The main problems with these methods are: high manufacturing cost of thread templates, poor versatility, and inability to accurately measure the pitch diameter; and large measurement errors and inability to accurately measure the pitch diameter using thread profile templates. Utility Model Content

[0004] The purpose of this invention is to solve the problems of high manufacturing cost, poor versatility, large measurement error, and inability to accurately measure the pitch diameter of existing measurement methods. It provides a measuring device and method capable of accurately measuring the pitch diameter of large multi-start trapezoidal internal threads. This invention features a simple measurement method, high measurement efficiency, low manufacturing cost, and novel structure. It is highly adaptable and can be used to measure multi-start trapezoidal internal threads of different diameters and pitches, and is particularly suitable for the efficient and accurate measurement of the pitch diameter in the production of large-diameter multi-start trapezoidal internal threads.

[0005] The technical solution of this utility model is as follows: This utility model is a large multi-head trapezoidal internal thread pitch diameter measuring device, which is special in that: the large multi-head trapezoidal internal thread pitch diameter measuring device includes an inside micrometer, a first pitch diameter measuring head and a second pitch diameter measuring head. One end of the first pitch diameter measuring head is provided with a first measuring ball, and the other end is connected to the inside micrometer. One end of the second pitch diameter measuring head is provided with a second measuring ball, and the other end is connected to the inside micrometer.

[0006] Furthermore, a threaded hole is provided at one end of the first pitch diameter measuring head that connects to the inside micrometer, and an inside micrometer connecting rod connecting thread is provided at one end of the inside micrometer. The first pitch diameter measuring head and the inside micrometer are connected by the threaded hole and the inside micrometer connecting rod connecting thread.

[0007] Furthermore, the end of the second pitch diameter measuring head connected to the inside micrometer has an inner hole. The measuring head of the inside micrometer is inserted into the inner hole of the second pitch diameter measuring head and is fixed and locked in place by a locking screw.

[0008] Furthermore, the diameters of the first and second measuring balls are d = 0.518 * P, where P is the pitch of the multi-start thread.

[0009] Furthermore, the first pitch diameter measuring head and the first measuring ball are connected by a thread.

[0010] Furthermore, the second mean diameter measuring head and the second measuring ball are connected by a thread.

[0011] This invention provides a large-scale multi-start trapezoidal internal thread pitch diameter measuring device. It modifies an inside micrometer, incorporating auxiliary fixtures at both ends for data measurement. Based on the measurement data, the precise pitch diameter of the multi-start trapezoidal internal thread is calculated using UG software. This invention consists of a first measuring ball, a first pitch diameter measuring head, an inside micrometer, a locking screw, a second pitch diameter measuring head, and a second measuring ball. Used for measuring the pitch diameter of multi-start trapezoidal internal threads, the first and second measuring balls offer high precision and a tight fit, and can be replaced according to different thread pitches. In use, the first and second measuring balls at both ends of the inside micrometer are screwed into the thread grooves, and the measuring head of the inside micrometer is rotated for measurement. Then, based on the known thread minor diameter D1, major diameter D2, pitch P, micrometer measurement of the internal thread pitch diameter D3, thread profile angle A, and the diameters of the first and second measuring balls, the thread profile diagram is drawn using UG software. Once the sketch is completed, full constraints are achieved, and the precise pitch diameter of the multi-start trapezoidal internal thread can be annotated using the "Quick Dimension" command. Therefore, this invention has the following advantages:

[0012] 1) This utility model solves the problem of inaccurate measurement of the pitch diameter during the machining of large multi-start trapezoidal internal threads, and can realize online detection of the pitch diameter of large multi-start trapezoidal internal threads.

[0013] 2) The measurement method of this utility model is simple, fast, has no complicated calculation process, high measurement accuracy, simple overall structure, low manufacturing cost, novel structure, and strong adaptability. It can be used to measure multi-start trapezoidal internal threads of different diameters and pitches, and is especially suitable for efficient and accurate measurement of the thread pitch diameter in the production of large-diameter multi-start trapezoidal internal threads. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 yes Figure 1 AA section view;

[0016] Figure 3 This is a schematic diagram of the structure of the first mean diameter measuring head of this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the second mean diameter measuring head of this utility model;

[0018] Figure 5 This is a schematic diagram illustrating the application of this utility model in measuring the pitch diameter of even-numbered thread starting using UG drawing.

[0019] Figure 6 This is a schematic diagram illustrating the application of this utility model in measuring the pitch diameter of odd-numbered thread using UG drawing.

[0020] The annotations in the attached figures are explained as follows:

[0021] 1. First measuring ball; 2. First pitch diameter measuring head; 3. Threaded connection of the inside micrometer connecting rod; 4. Inside micrometer; 5. Locking screw; 6. Second pitch diameter measuring head; 7. Second measuring ball;

[0022] D1, minor diameter; D2, major diameter; D3, micrometer measurement of the pitch diameter of the multi-start trapezoidal internal thread; D5, precise pitch diameter of the multi-start trapezoidal internal thread; P, pitch; P / 2, thread pitch line; A, thread profile angle. Detailed Implementation

[0023] The overall scheme of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0024] See Figures 1 to 4 The structure of this utility model includes a first measuring ball 1, a first pitch diameter measuring head 2, an inside micrometer 4, a second pitch diameter measuring head 6, and a second measuring ball 7. The first measuring ball 1 and the first pitch diameter measuring head 2 are connected by threads. Then, the end of the first pitch diameter measuring head connected to the inside micrometer is provided with a threaded hole. The first pitch diameter measuring head 2 and the inside micrometer 4 are connected by a threaded hole and an inside micrometer connecting rod thread 3. The end of the second pitch diameter measuring head 6 connected to the inside micrometer 4 is provided with an inner hole. The measuring head of the inside micrometer 4 is inserted into the inner hole of the second pitch diameter measuring head 6. Then, an Allen wrench is used to screw three locking screws 5 into the three threaded holes on the second pitch diameter measuring head 6 respectively to fix and lock it with the inside micrometer 4. Finally, the second pitch diameter measuring head 6 and the second measuring ball 7 are connected by threads.

[0025] The first measuring ball 1 and the second measuring ball 7 are identical in size and specifications. Appropriate measuring balls can be selected based on the different specifications of the thread. The optimal measuring ball diameter for the pitch diameter of a multi-start trapezoidal internal thread is d = 0.518 * P (P - multi-start thread pitch). The calculated value can be rounded down to the nearest integer to select a standard measuring ball. Theoretically, as long as the first measuring ball 1 and the second measuring ball 7 are tangent to both sides of the thread profile groove within the thread groove and do not touch the major diameter of the thread, they can be used.

[0026] The inner micrometer 4 can be assembled by selecting a suitable micrometer extension rod according to the theoretical pitch diameter of the thread of the product being measured.

[0027] See Figure 5 When measuring even-numbered threaded threads, the first measuring ball 1 and the second measuring ball 7 at both ends of the assembled multi-start trapezoidal internal thread micrometer are screwed into the internal thread groove, tangent to both sides of the groove. The measuring head of the micrometer 4 is rotated to measure, ensuring the measuring balls are tangent to both sides of the groove. The P / 2 thread pitch diameter is equal to half the pitch, and the two endpoints of the P / 2 thread pitch diameter intersect the thread profile slope and are parallel to the minor diameter D1. Then, based on the known minor diameter D1, major diameter D2, pitch P, the micrometer measurement D3, thread profile angle A, and the diameters of the first and second measuring balls 7, a thread profile diagram is drawn using UG software. Once the sketch is completed, full constraints are achieved, and the precise pitch diameter D5 of the multi-start trapezoidal internal thread can be annotated using the "Quick Dimension" command.

[0028] See Figure 6 When measuring odd-start threads, this utility model involves screwing the first measuring ball 1 at each end of the assembled multi-start trapezoidal internal thread micrometer into the thread minor diameter D1 and the second measuring ball 7 into the thread profile groove, tangent to both sides of the thread profile. The measuring head of the internal micrometer 4 is then rotated to measure, ensuring that the measuring ball 1 is tangent to the cylindrical surface of the thread minor diameter D1. The P / 2 thread pitch diameter line is equal to half the pitch, and the two endpoints of the P / 2 thread pitch diameter line intersect the inclined surface of the thread profile, parallel to the minor diameter D1. Then, based on the known thread minor diameter D1, major diameter D2, pitch P, the internal thread pitch micrometer measurement value D3, the thread profile angle A, and the diameters of the first and second measuring balls 7, a thread profile diagram is drawn using UG software. Once the sketch is completed, full constraints are achieved, and the precise pitch diameter D5 of the multi-start trapezoidal internal thread can be annotated using the "Quick Dimension" command.

[0029] This invention is used for measuring the pitch diameter of large multi-start trapezoidal internal threads. The specific operating steps are as follows:

[0030] 1) Select a suitable standard measuring ball and assemble the multi-start trapezoidal internal thread pitch diameter measuring device. The diameter of the measuring ball is calculated based on the formula and rounded to the nearest integer. The optimal measuring ball diameter for the multi-start trapezoidal thread pitch diameter is d = 0.518 * P, where P is the multi-start thread pitch. Theoretically, it can be used as long as the first measuring ball 1 and the second measuring ball 7 are tangent to the two sides of the thread profile within the thread groove and do not touch the major diameter of the thread.

[0031] 2) After assembling the multi-start trapezoidal internal thread pitch diameter measuring device, return the scale of the measuring head of the inner micrometer 4 to zero, measure the length of the multi-start trapezoidal internal thread pitch diameter measuring device, that is, the distance between the first measuring ball 1 and the second measuring ball 7, and record the length L1.

[0032] 3) Screw the multi-start trapezoidal internal thread pitch diameter measuring device into the internal thread tooth profile groove, tangent to both sides of the thread tooth profile, rotate the measuring head of the inner micrometer 4 to measure the pitch diameter of the multi-start trapezoidal internal thread on site, and record the scale value L2 of the measuring head of the inner micrometer 4.

[0033] 4) The mean diameter of the multi-start trapezoidal internal thread measured by a micrometer is D3 = L1 + L2.

[0034] 5) Based on the measurable known data, such as the thread minor diameter D1, major diameter D2, pitch P, thread pitch diameter P / 2, the micrometer measurement value D3 of the multi-start trapezoidal internal thread, thread profile angle A, and the diameters of the first measuring ball 1 and the second measuring ball 7, draw the thread profile diagram using UG and fully constrain the sketch.

[0035] 6) Use the

Quick Dimension

[0036] The content of this utility model and the technical content not specifically described in the above embodiments are the same as the prior art.

[0037] The above are merely specific embodiments disclosed in this utility model, but the scope of protection disclosed in this utility model is not limited thereto. The scope of protection disclosed in this utility model shall be determined by the scope of protection of the claims.

Claims

1. A large multi-start trapezoidal internal thread pitch diameter measuring device, characterized in that: The large multi-head trapezoidal internal thread pitch diameter measuring device includes an inside micrometer, a first pitch diameter measuring head, and a second pitch diameter measuring head. One end of the first pitch diameter measuring head is provided with a first measuring ball, and the other end is connected to the inside micrometer. One end of the second pitch diameter measuring head is provided with a second measuring ball, and the other end is connected to the inside micrometer.

2. The large multi-start trapezoidal internal thread pitch diameter measuring device according to claim 1, characterized in that: The first pitch diameter measuring head is provided with a threaded hole at one end connected to the inside micrometer, and the inside micrometer is provided with an inside micrometer connecting rod thread at one end. The first pitch diameter measuring head and the inside micrometer are connected by the threaded hole and the inside micrometer connecting rod thread.

3. The large multi-start trapezoidal internal thread pitch diameter measuring device according to claim 2, characterized in that: The second median diameter measuring head has an inner hole at one end connected to the inside micrometer. The measuring head of the inside micrometer is inserted into the inner hole of the second median diameter measuring head and is fixed and locked in place by a locking screw.

4. The large multi-start trapezoidal internal thread pitch diameter measuring device according to claim 3, characterized in that: The diameter d of the first and second measuring balls is 0.518 * P, where P is the pitch of the multi-start thread.

5. The large multi-start trapezoidal internal thread pitch diameter measuring device according to any one of claims 1 to 4, characterized in that: The first pitch diameter measuring head and the first measuring ball are connected by a thread.

6. The large multi-start trapezoidal internal thread pitch diameter measuring device according to claim 5, characterized in that: The second mean diameter measuring head and the second measuring ball are connected by a thread.

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