High-precision testing fixture for measuring width of opening part of marine engine cylinder body

Abstract

The utility model discloses a high-precision testing fixture for measuring the width of an opening part of a marine engine cylinder body. The high-precision testing fixture comprises a bracket and a dial indicator, the bracket comprises a handheld part and a mounting part; a fixing block is arranged at the end part of the mounting part; a mounting cavity is formed in the mounting part, and a through hole is formed in the fixing block; the center of the through hole is coaxial with the center of the mounting cavity; the head of the dial indicator is arranged in the mounting cavity, and the probe of the dial indicator passes through the through hole; the gauge is simple in structure, high in measurement precision, and high in measurement efficiency.

Description

Technical Field

[0001] The utility model relates to the field of measuring the width of the open part of a marine engine cylinder block, and particularly to a high-precision inspection tool for measuring the width of the open part of a marine engine cylinder block. Background Art

[0002] (Refer to Figure 1 and Figure 2 ) An open part 11 is provided at the top of a marine engine cylinder block 10 for mating with a bearing / shaft. Before assembly, in order to ensure that the clearance between the open part 11 and the bearing / shaft meets the process requirements, it is necessary to measure the width of each open part 11. Generally, the width of two places needs to be measured for one open part 11, namely at place a and place b. The width at place a should be 323.838 ± 0.038; the width at place b should be 323.71 ± 0.025. The measurement accuracy requirement is relatively high. There are 9 open parts 11 on one cylinder block 10, so 18 measurements need to be made.

[0003] Due to structural limitations, the width of the open part 11 cannot be detected by using an existing length measuring instrument; and it is very time-consuming to detect by using a coordinate measuring machine. Therefore, it is necessary to design an inspection tool that can quickly and accurately detect the width of the open part. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a high-precision inspection tool for measuring the width of the open part of a marine engine cylinder block.

[0005] The innovation point of the utility model lies in: the structure of the application is simple, the measurement accuracy is high, and the measurement efficiency is high.

[0006] To achieve the above-mentioned utility model purpose, the technical solution of the utility model is:

[0007] A high-precision inspection tool for measuring the width of the open part of a marine engine cylinder block, comprising a bracket and a dial indicator; the bracket includes a handheld part and an installation part; a fixing block is arranged at the end of the installation part; an installation cavity is arranged on the installation part, and a through hole is arranged on the fixing block; the through hole is communicated with the installation cavity and is coaxial at the center; the head of the dial indicator is placed in the installation cavity, and the measuring needle of the dial indicator passes through the through hole; the measuring needle and the through hole are fixed by a screw.

[0008] Further, a clamping collar is also arranged between the measuring needle and the through hole.

[0009] Further, the inspection tool also includes a standard calibration block. The standard calibration block is in a block shape, with a rectangular notch arranged at the top, and steps are symmetrically arranged at the bottom of the notch.

[0010] Further, a weight-reducing hole is also arranged on the handheld part.

[0011] The beneficial effect of the utility model is:

[0012] First: It has a simple structure. The dial indicator is installed on the bracket. When measuring, the bracket is directly placed on the opening part, and the dial indicator is rotated to measure. It has high precision, fast measuring speed and high efficiency.

[0013] Second: A weight-reducing hole is provided on the handheld part, which can reduce its own weight. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of a marine engine cylinder block.

[0015] Figure 2 It is Figure 1 a partial enlarged view of

[0016] Figure 3 a schematic structural diagram of the present utility model.

[0017] Figure 4 It is Figure 3 a side view of

[0018] Figure 5 a schematic structural diagram of a standard calibration block.

[0019] In the figure: 10 is the cylinder block, 11 is the opening part, 20 is the bracket, 21 is the handheld part, 21.1 is the weight-reducing hole, 22 is the mounting part, 22.1 is the mounting cavity, 23 is the fixing block, 23.1 is the through hole, 30 is the dial indicator, 31 is the dial head, 32 is the measuring needle, 40 is the standard calibration block, 41 is the notch, 42 is the step, and 50 is the clamping hoop. Detailed Embodiment

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings.

[0021] A high-precision gauge for measuring the width of the opening part of a marine engine cylinder block includes a bracket 20 and a dial indicator 30; the bracket 20 includes a handheld part 21 and a mounting part 22; a fixing block 23 is provided at the end of the mounting part 22; a mounting cavity 22.1 is provided on the mounting part 22, and a through hole 23.1 is provided on the fixing block 23; the through hole 23.1 communicates with the mounting cavity 22.1 and is coaxial at the center; the dial head 31 of the dial indicator 30 is placed in the mounting cavity 22.1, and the measuring needle 32 of the dial indicator 30 passes through the through hole 23.1; the measuring needle 32 is fixed to the through hole 23.1 by a screw.

[0022] Furthermore, the overall length of the bracket 11 can be determined according to the width of the opening part 11. For example, in this application, since the width of the opening part 11 is about 323 cm, the overall length of the bracket 11 can be determined within the range of 318 cm to 320 cm.

[0023] Further, the dial indicator 30 can be directly purchased from the market, such as the dial indicator of Mitutoyo Corporation in Japan, with high measurement accuracy.

[0024] Further, a clamping collar 50 is also provided between the probe 32 and the perforation 23.1.

[0025] Further, the inspection tool further includes a standard calibration block 40 (refer to Figure 5 ), the standard calibration block 40 is in a block shape, with a rectangular notch 41 provided at the top, and steps 42 symmetrically provided at the bottom of the notch 41.

[0026] Further, several standard calibration blocks 40 can be provided according to measurement requirements. In this application, two are provided with the same structure. Taking one of them as an example (refer to Figure 5 ), the width a1 of the notch 41 corresponds to the width at the opening part 11a, and is used for zero calibration of the dial indicator 30 before measuring the width at a.

[0027] In this application, the width of a1 can be set to 323.83 ± 0.005; place the inspection tool on the step 42, hold one end of the handheld part 21 against one side wall of the notch 41, rotate the dial of the dial indicator 30 so that the probe 32 abuts against the other side wall of the notch 41, and calibrate the zero position. After calibration, the width at the opening part 11a can be measured. During measurement, hold one end of the inspection tool against one side wall at a, rotate the dial of the dial indicator 30 until the probe 32 abuts against the other side at a, complete the measurement, and read the value (one full rotation of the dial indicator is 0.001 cm).

[0028] Further, a weight-reducing hole 21.1 is also provided on the handheld part 21.

[0029] The described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

Claims

1. A high-precision gauge for measuring the width of the opening of a marine engine cylinder block, characterized by: The invention comprises a bracket (20) and a micrometer (30); the bracket (20) comprises a hand-held portion (21) and a mounting portion (22); a fixing block (23) is arranged at the end of the mounting portion (22); a mounting cavity (22.1) is arranged on the mounting portion (22), and a through hole (23.1) is arranged on the fixing block (23); the through hole (23.1) is connected to the mounting cavity (22.1), and the centers are coaxial; a dial head (31) of the micrometer (30) is placed in the mounting cavity (22.1), and a measuring needle (32) of the micrometer (30) passes through the through hole (23.1); and the measuring needle (32) and the through hole (23.1) are fixed by screws.

2. The high-precision gauge for measuring the width of the opening of a marine engine cylinder block according to claim 1, characterized in that: A clamping hoop (50) is also provided between the measuring needle (32) and the perforation (23.1).

3. The high-precision gauge for measuring the width of the opening of a marine engine cylinder block according to claim 1, characterized in that: The inspection tool further comprises a standard calibration block (40), the standard calibration block (40) is block-shaped, a rectangular notch (41) is arranged on the top, and steps (42) are symmetrically arranged at the bottom of the notch (41).

4. The high-precision gauge for measuring the width of the opening of a marine engine cylinder block according to claim 1, characterized in that: A weight-reducing hole (21.1) is also provided on the handheld portion (21).

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