Large-specification thin-wall shell inner diameter measuring device

Abstract

The utility model discloses a device for measuring the inner diameter of a large-specification thin-wall shell, and the device is provided with a testing fixture body, a dial indicator which is fixedly disposed on the testing fixture body, and a first supporting part and a second supporting part which are disposed at the left and right sides of the testing fixture body in the same radial direction. The first supporting part comprises a first supporting seat fixed with the testing fixture body and a lever structure rotationally arranged on the first supporting seat, the lever structure is arranged to be a right-angle lever and comprises a first measuring piece fixedly arranged on the vertical rod and a supporting rod fixedly arranged on the horizontal rod in the vertical direction, and the supporting rod and a gauge head of the dial indicator are coaxially arranged; the horizontal change of the inner diameter is converted into the vertical change through the vertical lever, the measuring result is obtained through comparison of the dial indicator and the standard component, the measuring result can be rapidly obtained, the structure is simple, the measuring precision is high, and data processing is accurate.

Description

Technical Field

[0001] The utility model belongs to the technical field of shell inner diameter measurement, and particularly relates to a large-size thin-wall shell inner diameter measuring device. Background Art

[0002] The compressor is one of the important parts in the refrigeration industry, and the compressor housing, especially the large-sized thin-walled housing, is often marked in a special way on the drawings. The roundness tolerance is often larger than the size tolerance. At this time, the traditional insertion detection is basically powerless for this kind of non-round workpiece. First of all, if the insertion gap is too small, the workpiece cannot be inserted. If the gap is too large, the accuracy will be seriously reduced, which is simply unacceptable. However, when it comes to the subsequent stamping assembly, this size is an important and necessary inspection item. The commonly used detection method is three-coordinate measurement, which has sufficient accuracy but extremely low efficiency and high cost, and is not suitable for monitoring the dimensions on the production line at any time. The size of the measured parts is large and the size requirements are high, so a portable and intuitive large inner diameter detection device is the first choice, and multiple direction detection can evaluate the average diameter of the inner diameter of the shell, which completely solves the measurement problem caused by the non-roundness of thin-walled measured parts.

[0003] The utility model with announcement number CN218584039U discloses a shell inner diameter measuring device which is easy to position. The key points of its technical solution include a table panel, the upper surface of the table panel is fixedly connected to the lower surface of a support frame, a lifting assembly is arranged in the support frame, a measuring mechanism is arranged on the side of the lifting assembly, the lifting assembly is mutually engaged with the measuring mechanism through a rotating rod, the lifting assembly includes a first electric push rod, during use, the measuring mechanism can be moved to the inside of the shell by the lifting assembly, and by adjusting the height of the measuring mechanism, the measuring mechanism can measure different heights inside the shell, thereby improving the applicability of the measuring device, and during the measurement process of the measuring mechanism, it can ensure that it is in stable contact with the inner wall of the shell, thereby ensuring the measurement accuracy of the measuring device, but its structural setting is relatively complicated and it is not convenient to carry.

[0004] In order to measure the inner diameter of large-sized thin-walled shells, it is necessary to develop a measuring device with simple structure, convenient and fast measurement and easy to carry. Summary of the invention

[0005] The purpose of the utility model is to provide a device for measuring the inner diameter of a large-sized thin-walled shell in view of the above-mentioned deficiencies in the prior art, so as to realize rapid measurement of the inner diameter of the large-sized thin-walled shell.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A device for measuring the inner diameter of a large-sized thin-walled shell comprises a test body, a dial indicator fixed on the test body, and a first support part and a second support part arranged on the left and right sides of the test body in the same radial direction;

[0008] The first support portion includes a first support seat fixed to the inspection body and a lever structure rotatably arranged on the first support seat, and the first support seat is provided with a U-shaped groove for installing the lever structure;

[0009] The lever structure is provided with a first measuring rod and a support rod coaxially contacting with the dial indicator head, and the end of the lever structure is movably arranged between upper and lower limit posts spaced apart on the first support seat, and the lower limit post is vertically adjustable.

[0010] The lever structure is configured as a right-angle lever, and the first measuring rod is fixed on the vertical rod, the supporting rod is fixed on the horizontal rod in the vertical direction, and the vertical rod is located radially outside;

[0011] The ends of the horizontal rods are mounted on the upper and lower limit posts and move up and down driven by the vertical rods, and a buffer spring is also sleeved on the lower limit post;

[0012] The second supporting part includes a second supporting seat fixed to the inspection body and a second measuring element protruding from the second supporting seat, and the second measuring element, the U-shaped groove and the first measuring element are arranged in the same radial direction.

[0013] The front and rear sides of the inspection body are also provided with a third support part and a fourth support part symmetrically in the same radial direction, and the third support part and the fourth support part are both provided with a third support seat and a third measuring element telescopically arranged on the third support seat.

[0014] A limiting boss is provided on the radial inner side of the third measuring element, and its telescopic amount is adjusted by a pin shaft arranged at the rear end, and an auxiliary spring is also provided between the limiting boss and the pin shaft.

[0015] The second measuring element is fixed on the second supporting seat.

[0016] The lower limiting column is threadedly connected to the first supporting portion.

[0017] A handle is also fixedly provided on the top of the detection body.

[0018] The inspection body is configured as an annular structure, and the outer end surfaces of the first supporting part, the second supporting part, the third supporting part and the fourth supporting part are arranged in the same circumferential direction.

[0019] The beneficial effects of the utility model are:

[0020] (1) The device for measuring the inner diameter of a large-sized thin-walled shell comprises a testing body, a dial indicator fixed on the testing body, and a first support part and a second support part co-radially arranged on the left and right sides of the testing body, wherein the first support part comprises a first support seat fixed to the testing body and a lever structure rotatably arranged on the first support seat, the lever structure is a right-angle lever and comprises a first measuring piece fixed on a vertical rod and a support rod fixed on a horizontal rod in the vertical direction, and the support rod is coaxially arranged with the dial indicator head, the horizontal change of the inner diameter is converted into a vertical change through the vertical lever, and then the measurement result is obtained by comparing the dial indicator with the standard part, the measurement result can be obtained quickly, and the structure is simple, the measurement accuracy is high, and the data processing is accurate.

[0021] (2) The measuring method of this measuring device is contact measurement, focusing on the inner diameter detection of special parts such as thin-walled non-cylindrical parts, and obtaining the measurement results by comparing with standard parts (dimensional transfer benchmark, equivalent to block gauge); the dial indicator is set in conjunction with the lever structure, with novel design, simple structure, high measurement accuracy (total measurement accuracy ≤ 0.01), simple and reliable operation, convenient and fast, high detection efficiency, and can be placed in the workshop for batch detection. It has strong environmental adaptability and can be widely used in the domestic automobile, motorcycle, and air-conditioning and refrigeration industries, providing reliable detection guarantees for these industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model;

[0023] Figure 2 yes Figure 1 BB section view;

[0024] Figure 3 It is a three-dimensional diagram of the utility model;

[0025] Figure 4 is a partial structural diagram of the first supporting portion;

[0026] Figure 5 It is a partial structural diagram of the third supporting part. DETAILED DESCRIPTION

[0027] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0028] The utility model provides a device for measuring the inner diameter of a large-sized thin-walled shell. Figures 1 to 5 shown.

[0029] A device for measuring the inner diameter of a large-sized thin-walled shell comprises a test body 1, a dial indicator 2 fixed on the test body 1, and a first support portion 3 and a second support portion 4 radially arranged on the left and right sides of the test body 1; the first support portion 3 comprises a first support seat 31 fixed to the test body 1 and a lever structure rotatably arranged on the first support seat 31, and a U-shaped groove 311 for installing the lever structure is provided on the first support seat 31. In the present embodiment, the U-shaped groove 311 is radially inwardly opened, and the test body is arranged as an annular structure, and the first support portion 3 and the second support portion 4 are correspondingly arranged at the extension of the annular structure.

[0030] The lever structure is configured as a right-angle lever and includes a first measuring piece 321 fixedly mounted on the vertical rod 32 and a support rod 331 fixedly mounted on the horizontal rod 33 along the vertical direction, and the support rod 331 is coaxially arranged with the gauge head 21 of the dial indicator 2, while the vertical rod 32 is located radially outward, and the hinged portion of the lever structure and the first support seat 31 is located at the junction of the vertical rod 32 and the horizontal rod 33; the end of the horizontal rod 33 is mounted on two upper and lower limit columns arranged at intervals and moves up and down under the drive of the vertical rod 32, and the upper limit column 312 and the lower limit column 313 are correspondingly arranged at intervals on the upper and lower end surfaces of the first support seat 31, and the spacing between the two is adjustable, and a buffer spring 314 is also sleeved on the lower limit column 313; in this embodiment, the lower limit column 313 is threadedly connected to the first support portion 3, and its upper end portion extends into the U-shaped groove 311 and is adjustable vertically, thereby pushing the horizontal rod to rotate, thereby adjusting the protrusion amount of the first measuring piece 321.

[0031] The second support portion 4 includes a second support seat 41 fixed to the inspection body 1 and a second measuring element 42 protruding from the second support seat 41, and the second measuring element 42, the U-shaped groove 311 and the first measuring element 321 are arranged in the same radial direction. In this embodiment, the second measuring element 42 is fixed on the second support seat 41, and its protruding end surface is relatively fixed. When measuring, radial adjustment is performed by adjusting the protruding amount of the first measuring element 321.

[0032] In order to better assist the measurement, the front and rear sides of the inspection body 1 are also radially symmetrically provided with a third support part 5 and a fourth support part 6, and the third support part 5 and the fourth support part 6 are both provided with a third support seat 51 and a third measuring element 52 which is telescopically arranged on the third support seat 51, and the outer end faces of the first support part 3, the second support part 4, the third support part 5 and the fourth support part 6 are arranged in the same circumferential direction, and the corresponding measuring elements are arranged protruding from the outer end faces.

[0033] A limiting boss is provided on the radial inner side of the third measuring piece 52, and its extension amount is adjusted by a pin shaft 53 provided at the rear end, and an auxiliary spring 54 is provided between the limiting boss and the pin shaft. The setting of the limiting boss can prevent the third measuring piece 52 from passing through the supporting part during adjustment.

[0034] In order to facilitate holding, a handle 7 is fixedly provided on the top of the detection body, and the handle 7 can be held tightly when moving.

[0035] When in use, first rotate the lower limit column 313 at the bottom of the first support part 3 according to the size of the thin-walled shell to be measured, adjust its extension amount, and then push the horizontal rod 33 of the right-angle lever to move upward and simultaneously drive the vertical rod 32 to rotate clockwise, so as to adjust the outward protrusion of the first measuring piece 321; then adjust the pin shaft 53 of the third support part 5 and the fourth support part 6 respectively located on the rear side of the third measuring piece 52, so that the third measuring piece 52 bulges outward.

[0036] Subsequently, the adjusted measuring device is placed on the median standard part 8, and the dial indicator is adjusted to zero; then the measuring device is placed on the workpiece to be measured. When placing the measuring device, the support end of the measuring device should be leveled and gently placed into the inner hole of the workpiece to be measured, and then the measuring device is pushed to the left with both hands, so that the second measuring element 42 of the second supporting part 4, that is, the fixed alloy column, contacts the inner diameter of the shell, and the first measuring element 321 protruding outward of the first supporting part 3 is pushed radially inward under the action of the inner wall of the shell, so that the vertical rod 32 of the lever structure rotates counterclockwise and synchronously drives the horizontal rod 33 to move downward, and the support rod 331 on the horizontal rod moves downward accordingly, and drives the dial indicator head to move synchronously, and then the measurement result is displayed by the dial indicator.

[0037] Finally, rotate the measuring device to a certain angle and re-measure according to the above steps to obtain the diameter values ​​at different positions.

[0038] The measuring method of this measuring device is contact measurement, focusing on the inner diameter detection of special parts such as thin-walled non-cylindrical parts, and obtaining the measurement results by comparing with standard parts (dimensional transfer benchmark, equivalent to block gauge); the dial indicator is set in conjunction with the lever structure, with novel design, simple structure, high measurement accuracy (total measurement accuracy ≤ 0.01), simple and reliable operation, convenient and fast, high detection efficiency, can be placed in the workshop for batch detection, strong environmental adaptability, and can be widely used in the domestic automobile, motorcycle, air-conditioning and refrigeration industry, providing reliable detection guarantee for these industries.

[0039] At the same time, you need to pay attention to maintenance during daily use. The precautions are as follows:

[0040] (1) The working surfaces of the device and standard parts should be kept clean and rust-proof treatment should be performed when they are not in use;

[0041] (2) The parts to be measured should be clean before measurement;

[0042] (3) After the inspection fixture is adjusted, please do not twist the screws at will;

[0043] (4) When measuring, make sure to place the gauge level, otherwise it will be difficult to place;

[0044] (5) Operators should handle the equipment with care and adhere to civilized operation when working.

[0045] If the words "first", "second" and so on are used in this patent to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of describing the utility model and simplifying the description, and the above words have no special meaning.

[0046] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

[0047] In the description of the present invention, it is necessary to understand that the terms "front", "rear", "left", "right", "center", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the protection content of the present invention.

Claims

1. A device for measuring the inner diameter of a large-sized thin-walled shell, characterized in that: It includes a testing body, a dial indicator fixed on the testing body, and a first supporting part and a second supporting part arranged on the left and right sides of the testing body in the same radial direction; The first support portion includes a first support seat fixed to the inspection body and a lever structure rotatably arranged on the first support seat, and the first support seat is provided with a U-shaped groove for installing the lever structure; The lever structure is provided with a first measuring rod and a support rod coaxially contacting with the dial indicator head, and the end of the lever structure is movably arranged between upper and lower limit posts spaced apart on the first support seat, and the lower limit post is vertically adjustable.

2. A device for measuring the inner diameter of a large-sized thin-walled shell according to claim 1, characterized in that: The lever structure is configured as a right-angle lever, and the first measuring rod is fixed on the vertical rod, the supporting rod is fixed on the horizontal rod in the vertical direction, and the vertical rod is located radially outside; The ends of the horizontal rods are mounted on the upper and lower limit posts and move up and down driven by the vertical rods, and a buffer spring is also sleeved on the lower limit post; The second supporting part includes a second supporting seat fixed to the inspection body and a second measuring element protruding from the second supporting seat, and the second measuring element, the U-shaped groove and the first measuring element are arranged in the same radial direction.

3. A device for measuring the inner diameter of a large-sized thin-walled shell according to claim 1, characterized in that: The front and rear sides of the inspection body are also provided with a third support part and a fourth support part symmetrically in the same radial direction, and the third support part and the fourth support part are both provided with a third support seat and a third measuring element telescopically arranged on the third support seat.

4. A device for measuring the inner diameter of a large-sized thin-walled shell according to claim 3, characterized in that: A limiting boss is provided on the radial inner side of the third measuring element, and its telescopic amount is adjusted by a pin shaft arranged at the rear end, and an auxiliary spring is also provided between the limiting boss and the pin shaft.

5. The device for measuring the inner diameter of a large-sized thin-walled shell according to claim 2, characterized in that: The second measuring element is fixed on the second supporting seat.

6. A device for measuring the inner diameter of a large-sized thin-walled shell according to any one of claims 1 to 5, characterized in that: The lower limiting column is threadedly connected to the first supporting portion.

7. A device for measuring the inner diameter of a large-sized thin-walled shell according to claim 6, characterized in that: A handle is also fixedly provided on the top of the inspection body.

8. The device for measuring the inner diameter of a large-sized thin-walled shell according to claim 3, characterized in that: The inspection body is configured as an annular structure, and the outer end surfaces of the first supporting part, the second supporting part, the third supporting part and the fourth supporting part are arranged in the same circumferential direction.

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