Crankshaft eccentricity gauge

Abstract

The utility model discloses a crankshaft eccentricity gauge comprising a pedestal, the pedestal is provided with a first support seat and a second support seat which support a crankshaft, and the pedestal is also provided with a first movable plate and a second movable plate which abut against the outer side of an eccentric part of the crankshaft. A first air nozzle for detecting the position of the first movable plate and a second air nozzle for detecting the position of the second movable plate are also arranged on the base; the beneficial effects of the utility model are that during measurement, the crankshaft is firstly placed on the first support and the second support, the crankshaft is rotated, the eccentric part naturally extrudes the first movable plate and the second movable plate and enables the first movable plate and the second movable plate to move, and the positions of the movable plates are detected through the air nozzles and output, so that the eccentricity of the eccentric part can be obtained; the method has the advantage of high measurement efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of crankshaft detection, in particular to a crankshaft eccentricity detection tool. Background Art

[0002] The crankshaft is a common component in the field of machining. The eccentric part is the core part of the crankshaft, which undertakes functions such as power output and load transmission. Therefore, before assembling the finished equipment, the eccentricity of the eccentric part needs to be detected. At present, there are three main methods for detecting the eccentricity of various crankshaft eccentric parts: 1. Use a contact displacement sensor to measure the eccentric outer circle of the crankshaft by comparing the measurement method with two measuring parts, and then calculate the comparison difference between the eccentric outer circle and the standard part. This method can quickly measure the eccentricity size, but the position and size of the positioning part of the measuring part are fixed, and it is impossible to measure multiple specifications; 2. Use three-coordinate point measurement to measure. This measurement method can measure the eccentricity of the eccentric outer circle of the crankshaft of the part, and can measure multiple specifications, but the measurement time is too long and the efficiency is too low. 3. Use a large-range grating sensor to directly measure the eccentric outer circle of the crankshaft, rotate 360° to calculate the difference between the maximum and minimum values, and then obtain the detection result of the crankshaft eccentricity. This measurement method can measure the eccentricity of the crankshaft eccentric outer circle and can measure a variety of specifications, but there are many measurement links, the overall measurement time is too long, and the cost is too high. The production site lacks special equipment that is fast, accurate, and compatible with a variety of specifications to detect this parameter.

[0003] The patent with the announcement number "CN208419847U" discloses "a crankshaft eccentricity measuring fixture", which includes a base, a crankshaft support frame connected to the base, and a measuring mechanism. The crankshaft support frame is provided with a V-groove matching the crankshaft, and a tungsten steel alloy pad is provided on the side wall of the V-groove. The measuring mechanism includes a slide rail support, a gauge seat and a dial indicator. The slide rail support is provided with a slide rail inclined and facing the crankshaft support frame, and the gauge seat is slidably connected to the slide rail. The gauge seat is provided with a gauge sleeve, and the measuring rod of the dial indicator passes through the gauge sleeve. The gauge seat is also provided with a set screw that passes through the gauge sleeve to fix the dial indicator. The measuring rod of the dial indicator faces the axis of the crankshaft. When measuring, the crankshaft to be measured is first positioned in the V-groove, and then the gauge seat is moved to make the measuring rod of the dial indicator contact the eccentric section of the crankshaft for measurement. The dimensional deviation of the crankshaft eccentricity is read by the dial indicator, and finally it is judged whether the crankshaft is qualified. The measurement and judgment process is relatively cumbersome and inefficient.

[0004] Therefore, our company proposes a crankshaft eccentricity gauge. Summary of the invention

[0005] The utility model aims to provide a crankshaft eccentricity measuring tool, which can realize the rapid detection of the crankshaft eccentricity.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The crankshaft eccentricity gauge comprises a base, on which a first support and a second support for supporting the crankshaft are arranged, the base is also provided with a first movable plate and a second movable plate abutting against the outer side of the eccentric part of the crankshaft, the base is also provided with a first air nozzle for detecting the position of the first movable plate and a second air nozzle for detecting the position of the second movable plate.

[0008] Preferably, a first fixed plate is provided on the base, and the first fixed plate is connected to the first movable plate via a first leaf spring; a second fixed plate is provided on the base, and the second fixed plate is connected to the second movable plate via a second leaf spring.

[0009] Preferably, the base is provided with a third support supporting the eccentric portion of the crankshaft, and two sides of the third support are respectively provided with a first opening and a second opening that penetrate therethrough;

[0010] The first movable plate is provided with a first movable rod extending into the first opening and abutting against the outer edge of the eccentric portion of the crankshaft, and the second movable plate is provided with a second movable rod extending into the second opening and abutting against the outer edge of the eccentric portion of the crankshaft.

[0011] Preferably, a first spring for returning the first movable plate to its original position is provided between the first fixed plate and the first movable plate, and a second spring for returning the second movable plate to its original position is provided between the second fixed plate and the second movable plate.

[0012] Preferably, a first guide rod is arranged on the first fixed plate, and a terminal end of the first guide rod extends into the first movable plate; and a second guide rod is arranged on the second fixed plate, and a terminal end of the second guide rod extends into the second movable plate.

[0013] Preferably, the first gas nozzle is installed in the first fixed plate and passes through the side wall of the first movable plate, and the second gas nozzle is installed in the second fixed plate and passes through the side wall of the second movable plate.

[0014] Preferably, the base is provided with a slide groove for the reciprocating movement of the first support, and the side wall of the slide groove is provided with a fastening screw for locking the first support.

[0015] Preferably, both the first support and the second support are replaceably provided with a V-shaped groove in contact with the crankshaft.

[0016] Preferably, an air pipe is installed on the base, a first air inlet connecting the air pipe and the first air nozzle is provided on the base, and a second air inlet connecting the air pipe and the second air nozzle is provided on the base.

[0017] Preferably, a first protective shell for accommodating the first movable plate and a second protective shell for accommodating the second movable plate are provided on the base.

[0018] The beneficial effects of the utility model are:

[0019] 1. When measuring, first place the crankshaft on the first support and the second support, rotate the crankshaft, and its eccentric part naturally squeezes the first movable plate and the second movable plate to move them. The position of the movable plate is detected and output by the air nozzle, and the eccentricity of the eccentric part can be obtained, which has the advantage of high measurement efficiency.

[0020] 2. The first support can move back and forth to measure crankshafts of different lengths; the V-groove can be replaced to measure crankshafts of different diameters, which improves the adaptability of the equipment and expands the scope of application.

[0021] 3. By setting the first spring and the second spring, the first movable rod and the second movable rod are always in close contact with the outer edge of the eccentric part of the crankshaft, so that the measurement result of the eccentricity is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of the utility model;

[0023] Figure 2 This is a three-dimensional diagram of the utility model without the protective shell;

[0024] Figure 3 This is a three-dimensional diagram of the utility model with the protective shell removed from another angle;

[0025] Figure 4 This is a left side view of the utility model without the protective shell;

[0026] Figure 5 This is a cross-sectional view of the utility model without the protective shell.

[0027] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings.

[0029] Embodiment 1

[0030] like Figure 1 and Figure 4As shown, the crankshaft eccentricity gauge of this embodiment includes a base 1, on which a first support 21 and a second support 22 for supporting the crankshaft 2 are arranged, and a first movable plate 32 and a second movable plate 42 are also arranged on the base 1 to abut against the outer side of the eccentric portion of the crankshaft 2, and a first air nozzle 36 for detecting the position of the first movable plate 32 and a second air nozzle 46 for detecting the position of the second movable plate 42 are also arranged on the base 1. When the crankshaft 2 is rotated, the eccentric portion of the crankshaft 2 squeezes the first movable plate 32 and the second movable plate 42, causing them to displace, and the eccentricity of the eccentric portion can be obtained by detecting the displacement amount through the first air nozzle 36 and the second air nozzle 46.

[0031] like Figure 2 and Figure 3 As shown, a first fixed plate 31 is provided on the base 1, and the first fixed plate 31 is connected to the first movable plate 32 through a first leaf spring 37. A second fixed plate 41 is provided on the base 1, and the second fixed plate 41 is connected to the second movable plate 42 through a second leaf spring 47. The leaf spring is provided to make the moving process of the movable plate relatively stable.

[0032] like Figure 4 As shown, the base 1 is provided with a third support 25 supporting the eccentric part of the crankshaft 2, and the two sides of the third support 25 are respectively provided with a through first opening and a second opening; the first movable plate 32 is provided with a first movable rod 33 extending into the first opening and abutting against the outer edge of the eccentric part of the crankshaft 2, and the second movable plate 42 is provided with a second movable rod 43 extending into the second opening and abutting against the outer edge of the eccentric part of the crankshaft 2. The first fixed plate 31 and the first movable plate 32 form a structure similar to a parallelogram. When the first movable rod 33 moves rightward due to the protrusion on the eccentric part of the crankshaft 2, the first movable plate 32 is driven to move rightward as a whole. At this time, the distance between the lower right part of the first movable plate 32 and the first gas nozzle 36 changes, and the first gas nozzle 36 can measure and record the eccentricity. The structure and principle of the second fixed plate 41 and the second movable plate 42 are similar to those. When the second movable rod 43 moves leftward due to the protrusion on the eccentric part of the crankshaft 2, the second gas nozzle 46 promptly measures and records the eccentricity of the point.

[0033] A first spring 34 is provided between the first fixed plate 31 and the first movable plate 32 to reset the first movable plate 32, and a second spring 44 is provided between the second fixed plate 41 and the second movable plate 42 to reset the second movable plate 42. The springs are provided so that the movable plates can quickly return to their original positions after being squeezed and moved by the protruding portion of the crankshaft, ensuring that the first movable rod 33 and the second movable rod 43 are always in contact with the outer edge of the crankshaft 2, thereby improving the accuracy of the measurement.

[0034] A first guide rod 35 is provided on the first fixed plate 31, and the end of the first guide rod 35 extends into the first movable plate 32. An opening is opened on the first movable plate 32 for the first guide rod 35 to reciprocate (actually: the first guide rod 35 is fixed, and the first movable plate 32 reciprocates along the first guide rod 35 under the extrusion of the crankshaft), so that the movement process of the first movable plate 32 is smooth and there is no deflection; a second guide rod 45 is provided on the second fixed plate 41, and the end of the second guide rod 45 extends into the second movable plate 42. This structure is consistent with the first guide rod 35 and will not be described in detail in this embodiment.

[0035] The first gas nozzle 36 is installed in the first fixed plate 31 and passes through the side wall of the first movable plate 32. The side wall of the first movable plate 32 is provided with an opening for the first gas nozzle 36 to reciprocate (actually: the first gas nozzle 36 is fixed, and the first movable plate 32 reciprocates under the extrusion of the crankshaft. The inner diameter of the opening needs to be larger than the outer diameter of the first gas nozzle 36 to avoid damage to the gas nozzle during the movement). The second gas nozzle 46 is installed in the second fixed plate 41 and passes through the side wall of the second movable plate 42. The structure is consistent with that of the first gas nozzle 36 and will not be described in detail in this embodiment.

[0036] like Figure 1 As shown, the base 1 is provided with a slide groove 23 for the first support 21 to reciprocate, and the side wall of the slide groove 23 is provided with a fastening screw 24 for locking the first support 21. According to the length of the crankshaft 2 to be tested, the position of the first support 21 in the slide groove 23 can be freely set, and the fastening screw 24 can be locked after selecting a suitable position.

[0037] The first support 21 and the second support 22 are replaceably provided with V-shaped grooves in contact with the crankshaft 2. V-shaped grooves of different sizes are selected according to different shaft diameters of the crankshaft 2, thereby improving the applicability of the equipment.

[0038] like Figure 3 and Figure 5 As shown, an air pipe 11 is installed on the base 1, a first air inlet 12 connecting the air pipe 11 and the first air nozzle 36 is provided on the base 1, and a second air inlet 13 connecting the air pipe 11 and the second air nozzle 46 is provided on the base 1. The air nozzle is supplied with air through the air pipe 11, so that it can detect the position of the movable plate in real time.

[0039] The base 1 is provided with a first protective shell 3 for accommodating the first movable plate 32 and a second protective shell 4 for accommodating the second movable plate 42, so as to form reliable protection for the movable plate, spring, air nozzle and other parts inside.

[0040] When this embodiment is in use, first put the standard workpiece crankshaft on, then rotate the crankshaft, and use two air nozzles to measure the positions of two movable plates to obtain the standard value of the crankshaft eccentricity. Then, replace the standard part, put the crankshaft to be tested on, rotate the workpiece to be tested, and use two air nozzles to measure the positions of two movable plates to obtain the eccentricity of the workpiece to be tested. By comparing with the standard value, you can know whether the workpiece is qualified or defective.

[0041] This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model are within the protection scope of the technical solution of the utility model.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0043] If the words "first", "second" and so on are used in this document 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. Unless otherwise stated, the above words have no special meaning.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A crankshaft eccentricity gauge, comprising a base, on which a first support and a second support for supporting the crankshaft are arranged, characterized in that: The base is also provided with a first movable plate and a second movable plate abutting against the outer side of the eccentric portion of the crankshaft, and the base is also provided with a first air nozzle for detecting the position of the first movable plate and a second air nozzle for detecting the position of the second movable plate.

2. The crankshaft eccentricity measuring fixture according to claim 1, characterized in that: The base is provided with a first fixed plate, which is connected to the first movable plate via a first leaf spring; the base is provided with a second fixed plate, which is connected to the second movable plate via a second leaf spring.

3. The crankshaft eccentricity measuring fixture according to claim 1, characterized in that: The base is provided with a third support for supporting the eccentric part of the crankshaft, and two sides of the third support are respectively provided with a first opening and a second opening that penetrate therethrough; The first movable plate is provided with a first movable rod extending into the first opening and abutting against the outer edge of the eccentric portion of the crankshaft, and the second movable plate is provided with a second movable rod extending into the second opening and abutting against the outer edge of the eccentric portion of the crankshaft.

4. The crankshaft eccentricity measuring fixture according to claim 2, characterized in that: A first spring for returning the first movable plate to its original position is arranged between the first fixed plate and the first movable plate, and a second spring for returning the second movable plate to its original position is arranged between the second fixed plate and the second movable plate.

5. The crankshaft eccentricity measuring fixture according to claim 2, characterized in that: The first fixed plate is provided with a first guide rod, the end of which extends into the first movable plate; the second fixed plate is provided with a second guide rod, the end of which extends into the second movable plate.

6. The crankshaft eccentricity measuring fixture according to claim 2, characterized in that: The first gas nozzle is installed in the first fixed plate and passes through the side wall of the first movable plate, and the second gas nozzle is installed in the second fixed plate and passes through the side wall of the second movable plate.

7. The crankshaft eccentricity measuring fixture according to claim 1, characterized in that: The base is provided with a sliding groove for the first support to reciprocate, and the side wall of the sliding groove is provided with a fastening screw for locking the first support.

8. The crankshaft eccentricity measuring fixture according to claim 1, characterized in that: The first support and the second support are both replaceably provided with V-shaped grooves that contact the crankshaft.

9. The crankshaft eccentricity measuring jig according to claim 1, characterized in that: An air delivery pipe is installed on the base, a first air inlet connecting the air delivery pipe and the first air nozzle is opened on the base, and a second air inlet connecting the air delivery pipe and the second air nozzle is opened on the base.

10. The crankshaft eccentricity measuring fixture according to claim 1, characterized in that: The base is provided with a first protective shell for accommodating the first movable plate and a second protective shell for accommodating the second movable plate.

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