Crankshaft eccentric part parallelism testing fixture

Abstract

The utility model discloses a crankshaft eccentric part parallelism testing fixture which comprises a base, a first support and a second support which are arranged on the base and used for supporting a crankshaft, a swing arm is further arranged on the base and provided with a static cutting edge which abuts against a first to-be-tested face of a crankshaft eccentric part, and a swing rod is further arranged on the swing arm and provided with a static cutting edge which abuts against a second to-be-tested face of the crankshaft eccentric part. The swing rod is provided with a movable cutting edge abutting against a second to-be-detected face of the crankshaft eccentric part, the height of the movable cutting edge is larger than that of the static cutting edge when the swing rod is not stressed, and the base is further provided with an air nozzle for detecting the position of the swing rod. The beneficial effects of the utility model are that during measurement, the crankshaft is rotated, the position of the swing rod is measured through the air nozzle and output, the parallelism between the two surfaces to be measured of the eccentric part can be obtained, and the device 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 eccentric part parallelism 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 parallelism of the eccentric part needs to be tested. At present, there are two main methods for the parallelism detection of various crankshaft eccentric parts: 1. The three-coordinate point measurement method is used for measurement. This measurement method can measure the parallelism between the eccentric outer circle of the crankshaft and the outer circle of the main shaft, and can measure a variety of specifications, but the measurement time is too long and the efficiency is too low. 2. Two large-range grating sensors are used to directly measure the eccentric outer circle of the crankshaft. After calibration with standard parts, the outer circle of the main shaft of the workpiece is placed on the positioning V-block. The measuring part contacts the eccentric outer circle of the workpiece, and the workpiece is rotated 360° to calculate the difference between the display values ​​of the two grating sensors in each direction, so as to obtain the parallelism detection result of the eccentric part of the crankshaft relative to the main shaft. This measurement method can measure the parallelism of the eccentric part of the crankshaft relative to the main shaft, and can measure a variety of specifications, but there are many measurement links and the cost is too high. The production site lacks special equipment that is fast, accurate, economical, and compatible with multiple specifications to detect this parameter.

[0003] The patent with the announcement number "CN217155256U" discloses "a parallelism inspection tool for the eccentric part of a crankshaft", including a base and a micrometer, and also a dial seat, the dial seat and the base are connected by a linear guide assembly; the micrometer is installed on the dial seat; the base is equipped with a spindle positioning structure located on one side of the linear guide assembly, the spindle positioning structure can locate the position of the spindle part of the crankshaft and can make the axis of the spindle part parallel to the guide direction of the linear guide assembly; when the dial seat moves along the guide direction of the linear guide assembly, the detection end of the micrometer can contact the outer side surface of the eccentric part. However, the parallelism measured by the device is only the parallelism of a certain section of the eccentric part relative to the crankshaft, not the relative parallelism between two sections of the eccentric part.

[0004] Therefore, our company proposes a crankshaft eccentric parallelism inspection fixture. Summary of the invention

[0005] The utility model aims to provide a crankshaft eccentric part parallelism inspection tool, which can realize the rapid inspection of the eccentric part parallelism.

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

[0007] The parallelism inspection tool of the crankshaft eccentric part comprises a base, on which a first support and a second support for supporting the crankshaft are arranged, and a swing arm is also arranged on the base, on which a static cutting edge abutting against a first surface to be measured of the eccentric part of the crankshaft is arranged, and a swing rod is also arranged on the swing arm, on which a dynamic cutting edge abutting against a second surface to be measured of the eccentric part of the crankshaft is arranged, and the height of the dynamic cutting edge of the swing rod is higher than the height of the static cutting edge when the swing rod is not under force, and an air nozzle for detecting the position of the swing rod is also arranged on the base.

[0008] Preferably, a swing arm support is provided on the base, one end of the swing arm is rotatably connected to the swing arm support via a swing arm rotating shaft, and the static cutting edge is located at the other end of the swing arm;

[0009] A spring support is arranged on the base, and a first spring for positioning and resetting the swing arm is arranged between the swing arm and the spring support.

[0010] Preferably, a guide seat is provided on the base, a guide groove is provided in the guide seat, and a guide rod is provided at the end of the swing arm, and the guide rod is located in the guide groove.

[0011] Preferably, one end of the swing rod is rotatably connected to the swing arm through a support rod, and the movable cutting edge is located at the other end of the swing rod;

[0012] The swing arm is provided with a spring hole, and a second spring for positioning and resetting the swing rod is arranged in the spring hole.

[0013] Preferably, a first clamping plate and a second clamping plate for guiding the swing rod are installed on the swing arm, and the support rod is arranged on the second clamping plate.

[0014] Preferably, a limiting seat is provided on the base, and a first limiting rod abutting against the end face of the crankshaft is provided in the limiting seat.

[0015] Preferably, a protective shell is arranged on the outer side of the swing arm, and a second limit rod for limiting the stroke of the swing arm is arranged on the protective shell.

[0016] 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.

[0017] Preferably, both the first support and the second support are replaceably provided with a V-shaped groove in contact with the crankshaft.

[0018] Preferably, an air pipe is installed on the base, and an air inlet connecting the air pipe and the air nozzle is opened on the base.

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

[0020] 1. When measuring, first place the crankshaft on the first support and the second support. The two surfaces to be measured at the eccentric part will naturally contact the static cutting edge and the dynamic cutting edge. Rotate the crankshaft, measure the position of the rocker arm through the air nozzle and output it, and the parallelism between the two surfaces to be measured at the eccentric part can be obtained, which has the advantage of high measurement efficiency.

[0021] 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.

[0022] 3. The setting of the guide seat and the first and second clamping plates can prevent the swing arm and the swing rod from deflecting during the swinging process, thereby improving the stability of the equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional diagram of the utility model;

[0024] Figure 2 A three-dimensional diagram of the present invention from another angle;

[0025] Figure 3 It is a three-dimensional diagram of the swing arm part of the utility model;

[0026] Figure 4 It is a three-dimensional diagram of the swing rod part of the utility model;

[0027] Figure 5 It is the front view of the utility model;

[0028] Figure 6 This is the front view of the utility model (without the guide seat and guide rod);

[0029] Figure 7 It is a partial cross-sectional view of the swing arm and protective shell.

[0030] 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

[0031] The utility model is further described below in conjunction with the accompanying drawings.

[0032] Embodiment 1

[0033] like Figure 1 , Figure 3 and Figure 6As shown, the crankshaft eccentric part parallelism inspection tool of this embodiment includes a base 1, on which a first support 21 and a second support 22 supporting the crankshaft 24 are arranged, and a swing arm 42 is also arranged on the base 1, and a static cutting edge 61 is arranged on the swing arm 42 to abut against the first surface to be measured 27 of the eccentric part of the crankshaft 24, and a swing rod 46 is also arranged on the swing arm 42, and a dynamic cutting edge 62 is arranged on the swing rod 46 to abut against the second surface to be measured 28 of the eccentric part of the crankshaft 24. The height of the dynamic cutting edge 62 of the swing rod 46 is higher than the height of the static cutting edge 61 when the crankshaft 24 is not stressed, so as to ensure that when the crankshaft 24 is placed, the second surface to be measured 28 can contact the dynamic cutting edge 62 (when the second surface to be measured 28 contacts the dynamic cutting edge 62, the self-weight of the crankshaft 24 will press down the dynamic cutting edge 62 to move it downward until the first surface to be measured 27 of the crankshaft 24 contacts the static cutting edge 61). The base 1 is also provided with an air nozzle 13 for detecting the position of the swing rod 46.

[0034] During the inspection, the crankshaft 24 is placed on the first support 21 and the second support 22, and the first test surface 27 and the second test surface 28 of the eccentric part of the crankshaft 24 are respectively located on the static cutting edge 61 and the dynamic cutting edge 62. Then the crankshaft 24 is rotated. During its rotation, the swing arm 42 itself will move up and down driven by the static cutting edge 61 and the dynamic cutting edge 62 (driven by the first test surface 27 and the second test surface 28, respectively). At the same time, the swing rod 46 and the dynamic cutting edge 62 will also move up and down under the action of the outer circumference of the second test surface 28. While the dynamic cutting edge 62 moves, the air nozzle 13 detects its position to obtain the parallelism of the eccentric part.

[0035] like Figure 3 and Figure 6 As shown, a swing arm support 41 is provided on the base 1, one end of the swing arm 42 is rotatably connected to the swing arm support 41 through a swing arm rotating shaft 43, and the static cutting edge 61 is located at the other end of the swing arm 42, so that the swinging process of the swing arm 42 is smoother;

[0036] A spring support 47 is provided on the base 1 , and a first spring 48 for positioning and resetting the swing arm 42 is provided between the swing arm 42 and the spring support 47 .

[0037] like Figure 4 and Figure 7 As shown, one end of the swing rod 46 is rotatably connected to the swing arm 42 through the support rod 63, and the moving blade 62 is located at the other end of the swing rod 46, so that the swing process of the swing rod 46 is smoother;

[0038] A spring hole is provided on the swing arm 42 , and a second spring 49 for positioning and resetting the swing rod 46 is placed in the spring hole.

[0039] In the unstressed state, the swing arm 42 is naturally lifted under the action of the first spring 48, and the swing rod 46 is naturally lifted under the action of the second spring 49, ensuring that when the crankshaft 24 is placed on the first support 21 and the second support 22, the first test surface 27 and the second test surface 28 of the eccentric part can contact the static cutting edge 61 and the dynamic cutting edge 62 respectively. During the rotation of the crankshaft 24, when the first test surface 27 rotates to the protruding part (if any) and contacts the static cutting edge 61, it will drive the swing arm 42 to move downward (i.e., rotate clockwise relative to the swing arm rotating shaft 43) through the static cutting edge 61, and when the first test surface 27 rotates to the concave part (if any) and contacts the static cutting edge 61, under the action of the first spring 48, the swing arm 42 moves upward (i.e., rotates counterclockwise relative to the swing arm rotating shaft 43), thereby ensuring that the first test surface 27 is always in contact with the static cutting edge 61. Similarly, under the action of the second spring 49, the second test surface 28 can also always contact with the dynamic cutting edge 62. Moreover, during the rotation of the crankshaft 24, in addition to the up and down swinging of the swing arm 42, under the action of the second test surface 28, the moving cutting edge 62 and the swing rod 46 will additionally swing up and down (i.e., the parallelism difference generated by the second test surface 28 relative to the first test surface 27). Therefore, by using the air nozzle 13 to measure the position of the swing rod 46, the parallelism of the eccentric part can be obtained.

[0040] like Figure 5 As shown, a guide seat 52 is provided on the base 1, and a guide groove is opened in the guide seat 52. A guide rod 51 is provided at the end of the swing arm 42, and the guide rod 51 is located in the guide groove to ensure that the swing arm 42 will not deviate to the left and right directions during the up and down swinging process, thereby ensuring the reliability and accuracy of the detection result.

[0041] like Figure 3 As shown, the swing arm 42 is provided with a first clamping plate 44 and a second clamping plate 45 for guiding the swing rod 46. A space for accommodating the swing rod 46 is formed between the first clamping plate 44 and the second clamping plate 45, so that the swing rod 46 will not deflect in the left and right directions when swinging up and down, thereby ensuring reliable and accurate detection results. The support rod 63 is arranged on the second clamping plate 45.

[0042] like Figure 1 and Figure 5 As shown, a limit seat 23 is provided on the base 1, and a first limit rod 26 is provided in the limit seat 23 to abut against the end surface of the crankshaft 24. It is ensured that during the rotation of the crankshaft 24, the crankshaft will not move to the left, thereby affecting the measurement result. In some embodiments, a baffle (not shown in the figure) to prevent the crankshaft 24 from moving right can also be provided on the first support 21 to ensure that the crankshaft 24 only rotates but does not move left or right.

[0043] like Figure 1 and Figure 7As shown, a protective shell 31 is disposed on the outer side of the swing arm 42 , and a second limit rod 32 is disposed on the protective shell 31 to limit the travel of the swing arm 42 to prevent the swing arm 42 from being lifted too high.

[0044] The base 1 is provided with a slideway for the first support 21 to reciprocate, and the side wall of the slideway is provided with a fastening screw 25 for locking the first support 21. According to the different lengths of the crankshaft 24 to be tested, the first support 21 can be moved to a suitable position, and then the fastening screw 25 can be tightened to lock it.

[0045] The first support 21 and the second support 22 are both replaceably provided with V-shaped grooves in contact with the crankshaft 24. Different V-shaped grooves can be replaced according to different diameters of the crankshaft 24 to be tested, thereby improving the applicability of the equipment.

[0046] like Figure 2 As shown, an air pipe 11 is installed on the base 1, and an air inlet 12 connecting the air pipe 11 and an air nozzle 13 is opened on the base 1, and air is supplied to the air nozzle 13 through the air pipe 11.

[0047] When this embodiment is in use, the standard workpiece crankshaft is first placed on, and then the crankshaft is rotated, and the position of the rotating rod 46 is measured by the air nozzle 13 to obtain the standard value of the parallelism of the eccentric part of the crankshaft. Then, the standard part is replaced, and the crankshaft to be measured is placed on, and the workpiece to be measured is rotated, and the position of the rotating rod 46 is measured by the air nozzle 13 to obtain the parallelism of the workpiece to be measured. By comparing with the standard value, it can be known whether the workpiece is a qualified product or a defective product.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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 eccentric part parallelism inspection tool, comprising a base, on which a first support and a second support for supporting the crankshaft are arranged, characterized in that: A swing arm is also provided on the base, and a static cutting edge abutting against the first measured surface of the eccentric part of the crankshaft is provided on the swing arm. A swing rod is also provided on the swing arm, and a dynamic cutting edge abutting against the second measured surface of the eccentric part of the crankshaft is provided on the swing rod. When the swing rod is not under force, the height of the dynamic cutting edge is higher than the height of the static cutting edge. An air nozzle for detecting the position of the swing rod is also provided on the base.

2. The crankshaft eccentric part parallelism tester according to claim 1, characterized in that: A swing arm support is provided on the base, one end of the swing arm is rotatably connected to the swing arm support via a swing arm rotating shaft, and the static cutting edge is located at the other end of the swing arm; A spring support is arranged on the base, and a first spring for positioning and resetting the swing arm is arranged between the swing arm and the spring support.

3. The crankshaft eccentric part parallelism tester according to claim 1, characterized in that: A guide seat is arranged on the base, a guide groove is arranged in the guide seat, and a guide rod is arranged at the end of the swing arm, and the guide rod is located in the guide groove.

4. The crankshaft eccentric part parallelism tester according to claim 1, characterized in that: One end of the swing rod is rotatably connected to the swing arm through a support rod, and the movable cutting edge is located at the other end of the swing rod; The swing arm is provided with a spring hole, and a second spring for positioning and resetting the swing rod is arranged in the spring hole.

5. The crankshaft eccentric part parallelism tester according to claim 4, characterized in that: The swing arm is provided with a first clamping plate and a second clamping plate for guiding the swing rod, and the support rod is arranged on the second clamping plate.

6. The crankshaft eccentric part parallelism tester according to claim 1, characterized in that: A limiting seat is arranged on the base, and a first limiting rod abutting against the end face of the crankshaft is arranged in the limiting seat.

7. The crankshaft eccentric parallelism tester according to claim 1, characterized in that: A protective shell is arranged on the outer side of the swing arm, and a second limit rod for limiting the travel of the swing arm is arranged on the protective shell.

8. The crankshaft eccentric part parallelism tester 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.

9. The crankshaft eccentric part parallelism tester 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.

10. The crankshaft eccentric part parallelism tester according to claim 1, characterized in that: An air delivery pipe is installed on the base, and an air inlet connecting the air delivery pipe and the air nozzle is opened on the base.

Images