Internal combustion engine connecting rod torsion resistance and parallelism detection device

Abstract

The utility model provides an internal combustion engine connecting rod torsion resistance and parallelism detection device comprising a main body structure, a torsion resistance measuring rod assembly and a parallelism measuring rod assembly. The main body structure comprises a vertical plate, a positioning hollow shaft, a measuring guide pipe and a supporting rod are vertically installed on the front side surface of the vertical plate, the positioning hollow shaft is located on the right portion of the vertical plate, the measuring guide pipe and the supporting rod are located on the left portion of the vertical plate, and the measuring guide pipe is arranged above the supporting rod; a conical hole is formed in the positioning hollow shaft and gradually contracts towards the vertical plate, a conical mandrel is arranged in the conical hole, three evenly-distributed sliding grooves are formed in the positioning hollow shaft from the axis to the outer surface of the positioning hollow shaft, and a copper sliding block is installed in each sliding groove. An annular groove is formed in the outer ring of the positioning hollow shaft and the outer ring of the sliding groove, and an annular clamping spring is arranged in the annular groove. The device is simple in operation and accurate in measurement, can effectively improve the detection efficiency of the connecting rod, and greatly reduces the detection cost.

Description

Technical Field

[0001] The utility model relates to the technical field of internal combustion engine maintenance, in particular to a device for detecting the twist and parallelism of an internal combustion engine connecting rod. Background Art

[0002] As a transmission component of the engine, the connecting rod bears alternating loads, has harsh working conditions, and is prone to bending and twisting deformation of the connecting rod. The out-of-tolerance parallelism of the connecting rod (i.e., bending and twisting deformation) causes the piston to be skewed in the cylinder, resulting in uneven wear between the piston and the cylinder, and between the connecting rod bearing and the connecting rod journal, which will have a great impact on the operation of the crank connecting rod mechanism. Thereby affecting the power, economy and service life of the engine. The change of the center distance of the connecting rod has a greater impact on the compression ratio of the engine. Affecting the power of the engine. Therefore, it is particularly important to detect the parallelism and center distance of the large and small holes of the connecting rod.

[0003] In the existing connecting rod detection technology, to detect the twist of the end face of the large end hole of the connecting rod and the parallelism of the center line of the large end hole of the connecting rod relative to the center line of the small end hole, it is necessary to use a coordinate measuring instrument or a digital display machine tool for detection, or use a detection platform in cooperation with a V-shaped support and a mandrel matching the large and small end holes of the connecting rod for detection.

[0004] Detection by a coordinate measuring instrument or a digital display machine tool is inefficient and costly; detection using a detection platform in cooperation with a V-shaped support and a mandrel matching the large and small end holes of the connecting rod has a large cumulative error generated by the V-shaped support and the mandrel, and the detection result is inaccurate. Moreover, the connecting rod detection instruments used in the existing detection technology are not easy to move and inconvenient to carry, and it is necessary to transport the connecting rod from the internal combustion engine maintenance site to a professional detection place. Therefore, it cannot meet the on-site detection requirements of the internal combustion engine connecting rod in fields such as ships in navigation and power stations in remote areas. Content of the Utility Model

[0005] The utility model provides a device for detecting the twist and parallelism of an internal combustion engine connecting rod, which solves the problems of inaccurate detection results and inconvenient portability of the existing connecting rod detection technology.

[0006] To achieve the above object, the technical solution adopted by the utility model is:

[0007] A device for detecting the twist and parallelism of an internal combustion engine connecting rod includes a main body structure, a twist measurement rod assembly and a parallelism measurement rod assembly;

[0008] The main body structure includes a vertical plate, and a positioning hollow shaft, a measurement conduit and a support rod are vertically installed on the front surface of the vertical plate. The positioning hollow shaft is located on the right part of the vertical plate, the measurement conduit and the support rod are located on the left part of the vertical plate, and the measurement conduit is arranged above the support rod;

[0009] The interior of the positioning hollow shaft is provided with a tapered hole that gradually contracts towards the vertical plate. A tapered mandrel is arranged within the tapered hole. The positioning hollow shaft is provided with three equally spaced chutes that extend from the axis to the outer surface of the shaft. A copper slider is installed within each chute. An annular groove is provided on the outer ring of the positioning hollow shaft and the chute, and an annular snap ring is arranged within the annular groove.

[0010] Further, the twist measurement rod assembly includes a twist measurement rod that is horizontally arranged;

[0011] The front part of the twist measurement rod is a thick rod, and the rear part is a thin rod. The diameter of the front part of the twist measurement rod is greater than that of the rear part. A chute is provided along the generatrix direction of the rear part of the twist measurement rod;

[0012] The upper part of the front part of the twist measurement rod is connected to the upper part of the dial indicator fixing rod by a first locking screw, and a dial indicator is fixed to the lower part of the dial indicator fixing rod.

[0013] Further, an annular groove is arranged between the front part and the rear part of the twist measurement rod.

[0014] Further, the parallelism measurement rod assembly includes a parallelism measurement rod that is perpendicular to the vertical plate;

[0015] The front part of the parallelism measurement rod is a thick rod, and the rear part is a thin rod. The diameter of the front part of the parallelism measurement rod is greater than that of the rear part. Two chutes are provided along the generatrix direction of the rear part of the parallelism measurement rod, and the two chutes are spaced 90° apart;

[0016] The upper part of the front part of the parallelism measurement rod is connected to the upper part of the vertically arranged transition rod by a second locking screw. A meter rod is fixed to the lower part of the transition rod by a locking device, and a lever gauge is fixed to the rear end of the meter rod.

[0017] Further, the bottom of the vertical plate is connected to the horizontal bracket by fastening screws, and the number of horizontal brackets is two.

[0018] Further, a number of spare holes for assembling measurement conduits are provided on the vertical plate. The centers of the number of spare holes for assembling measurement conduits are on the same horizontal line as the center of the positioning mandrel. A number of spare holes for assembling support rods are provided on the vertical plate. The centers of the number of spare holes for assembling support rods and the center position of the support rod can meet the requirements for supporting different types of connecting rods.

[0019] Further, the outer surface of the copper slider is flush with the outer surface of the positioning hollow shaft, and the inner surface of the copper slider is an inclined surface adapted to the tapered mandrel.

[0020] Furthermore, a straight hole is provided at one end of the tapered hole close to the vertical plate, and a thread is processed inside the straight hole. A straight shaft is provided at one end of the tapered mandrel close to the vertical plate, and a thread is processed on the outer surface of the straight shaft. The tapered hole and the tapered mandrel are connected by threads.

[0021] Furthermore, a limit pin is installed on the measuring tube, and the limit pin penetrates from the outer surface of the measuring tube to the inner hole.

[0022] The beneficial effects of the utility model are:

[0023] The main structure of the utility model is composed of a positioning hollow shaft and a measuring conduit installed on a vertical plate, which has the advantages of small size, simple structure and convenient carrying;

[0024] The positioning mandrel of the utility model is composed of a positioning conduit with a tapered hole vertically mounted on a vertical plate, a tapered shaft matched with the positioning conduit, and three copper sliders. By rotating the tapered shaft, the tapered shaft can be moved axially in the positioning conduit, thereby achieving uniform sliding of the three copper sliders, which can support the inner surface of the small end hole of the connecting rod, and achieve accurate positioning of the connecting rod;

[0025] The utility model positions the connecting rod sideways and does not use other fixtures to fix the connecting rod, thus avoiding deformation of the connecting rod caused by its own gravity or the fixture, and ensuring the accuracy of detection;

[0026] The utility model reserves a plurality of spare holes for assembling measuring conduits and assembling supporting rods, which can meet the detection of connecting rods of various models;

[0027] The utility model has the advantages of simple operation and accurate measurement, and can effectively improve the detection efficiency of the connecting rod and greatly reduce the detection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is the front view of the utility model.

[0030] Figure 2 It is a top view of the utility model.

[0031] Figure 3 for Figure 2 Section view of the middle AA plane.

[0032] Figure 4 is Figure 2 the sectional view taken along the B-B plane in

[0033] Figure 5 is Figure 2 the sectional view taken along the C-C plane in

[0034] Figure 6 the component diagram of the twist measurement rod of the present utility model.

[0035] Figure 7 is Figure 6 the sectional view taken along the E-E plane in

[0036] Figure 8 the component diagram of the parallelism measurement rod of the present utility model.

[0037] Figure 9 is Figure 8 the sectional view taken along the D-D plane in

[0038] Figure 10 the schematic diagram of the twist measurement of the connecting rod of the present utility model.

[0039] Figure 11 the schematic diagram of the parallelism measurement of the connecting rod of the present utility model.

[0040] Explanation of the reference numerals in the attached drawings:

[0041] 1. Vertical plate; 2. Horizontal support; 3. Positioning hollow shaft; 4. Measuring catheter; 5. Support rod; 6. Spare hole for assembling the measuring catheter; 7. Spare hole for assembling the support rod; 8. Fastening screw; 9. Tapered mandrel; 10. Copper slider; 11. Annular snap ring; 12. Limit pin; 13. Twist measurement rod; 14. Dial indicator fixing rod; 15. Dial indicator; 16. First locking screw; 17. Parallelism measurement rod; 18. Transition rod; 19. Second locking screw; 20. Lever indicator; 21. Gauge rod; 22. Locking device; 23. Measuring connecting rod. Detailed implementation manners

[0042] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are only a part rather than all of the embodiments of the present utility model. The description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present utility model. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and values set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be clear that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0046] In the description of the present utility model, it should be understood that the orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. generally indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present utility model. The orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0047] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper", etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figure with other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is inverted, the device described as "above or over other devices or structures" will then be positioned "below or under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0048] In addition, it should be noted that the use of terms such as "first", "second", etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0049] The present utility model provides a technical solution: a device for detecting the twist and parallelism of an internal combustion engine connecting rod, comprising a main body structure, a twist measurement rod assembly, and a parallelism measurement rod assembly;

[0050] The main body structure includes a vertical plate 1. A positioning hollow shaft 3, a measuring conduit 4, and a support rod 5 are vertically installed on the front surface of the vertical plate 1. The positioning hollow shaft 3 is located on the right part of the vertical plate 1, and the measuring conduit 4 and the support rod 5 are located on the left part of the vertical plate 1. The measuring conduit 4 is arranged above the support rod 5. The bottom of the vertical plate 1 is connected to a horizontal bracket 2 by fastening screws 8, and the number of the horizontal brackets 2 is two. A plurality of assembly measuring conduit spare holes 6 are provided on the vertical plate 1, and the centers of the plurality of assembly measuring conduit spare holes 6 are on the same horizontal line as the center of the positioning core shaft 3. A plurality of assembly support rod spare holes 7 are provided on the vertical plate 1, and the center positions of the plurality of assembly support rod spare holes 7 can meet the requirements for supporting connecting rods of different models.

[0051] The inside of the positioning hollow shaft 3 is provided with a tapered hole that gradually contracts towards the vertical plate 1. A tapered core shaft 9 is arranged in the tapered hole. The positioning hollow shaft 3 is provided with three evenly distributed sliding grooves that extend from the axis to the outer surface of the shaft. A copper slider 10 is installed in each sliding groove. An annular groove is provided on the outer ring of the positioning hollow shaft 3 and the sliding grooves. An annular snap spring 11 is arranged in the annular groove. The outer surface of the copper slider 10 is flush with the outer surface of the positioning hollow shaft 3. The inner surface of the copper slider 10 is an inclined surface adapted to the tapered core shaft 9. Threads are provided inside the tapered hole at the end close to the vertical plate 1, and threads are machined on the outer surface of the tapered core shaft 9 at the end close to the vertical plate 1. The tapered hole and the tapered core shaft 9 are threadedly connected.

[0052] The twist measurement rod assembly includes a twist measurement rod 13 which is horizontally arranged;

[0053] The front part of the twist measurement rod 13 is a thick rod, and the rear part is a thin rod. The diameter of the front part of the twist measurement rod 13 is larger than that of the rear part. A sliding groove is provided along the generatrix direction of the rear part of the twist measurement rod 13.

[0054] The upper part of the front part of the twist measurement rod 13 is connected to the upper part of the vertically arranged dial indicator fixing rod 14 by a first locking screw 16. A dial indicator 15 is fixed to the lower part of the dial indicator fixing rod 14. An annular groove is provided between the front part and the rear part of the twist measurement rod 13.

[0055] The parallelism measurement rod assembly includes a parallelism measurement rod 17 which is horizontally arranged;

[0056] The front part of the parallelism measurement rod 17 is a thick rod, and the rear part is a thin rod. The diameter of the front part of the parallelism measurement rod 17 is larger than that of the rear part. Two sliding grooves are provided along the generatrix direction of the rear part of the parallelism measurement rod 17, and the two sliding grooves are spaced 90°.

[0057] The upper part of the front part of the parallelism measurement rod 17 is connected to the upper part of the vertically arranged transition rod 18 by a second locking screw 19. The lower part of the dial indicator fixing rod 14 is fixed with a dial rod 21 through a locking device 22, and a lever indicator 20 is fixed to the rear end of the dial rod 21.

[0058] As Figures 1 - 5As shown in the figure, the main structure of the utility model consists of a steel vertical plate 1, a positioning hollow shaft 3, a measuring conduit 4 and a support rod 5 installed on the vertical plate. The vertical plate 1 is fixed on two horizontal brackets 2 by fastening screws 8. The vertical plate 1 is the reference component of the utility model, and the positioning hollow shaft 3 and the measuring conduit 4 are both fixedly assembled perpendicular to the vertical plate 1. Multiple spare holes 6 for assembling the measuring conduit and spare holes 7 for assembling the support rod are reserved on the vertical plate 1. In addition to the main structure, the utility model also has a twist measurement rod assembly and a parallelism measurement rod assembly.

[0059] Inside the positioning hollow shaft 3 is a tapered hole, and the inner hole of the end fixed on the vertical plate 1 is machined with threads. Three evenly distributed chutes are machined from the axis line of the positioning hollow shaft 3 to the outer surface of the shaft, and copper sliders 10 are installed in the chutes. The outer surface of the copper slider 10 is flush with the surface of the positioning hollow shaft 3, and the inner surface is an inclined surface that contacts the tapered mandrel 9. The front end of the tapered mandrel 9 is machined with threads, which are matched with the internal threads of the vertical plate 1. By rotating the tapered mandrel 9, the forward and backward movement of the tapered mandrel 9 inside the positioning hollow shaft 3 can be realized, so that the expansion and contraction of the copper slider 10 relative to the positioning hollow shaft 3 can be realized. There is an annular groove on the outer ring of the positioning hollow shaft 3 and the three copper sliders 10, and an annular snap ring 11 is installed in the groove, which can cause the copper slider 10 to contract into the positioning hollow shaft 3 when the tapered mandrel 9 moves outward. A limit pin 12 is installed on the measuring conduit 4, penetrating from the outer surface of the measuring conduit 4 to the inner hole.

[0060] As Figure 6 and 7 shown in the figure, the twist measurement rod assembly locks the dial indicator fixing rod 14 on the twist measurement rod 13 by the first locking screw 16, and the dial indicator 15 is assembled at one end of the dial indicator fixing rod 14. The twist measurement rod 13 is a variable-diameter rod. A chute is machined along the generatrix direction of the thin rod part, and a hole is machined perpendicular to the rod body in the thick rod part for installing the dial indicator fixing rod 14. There is an annular groove in the middle part between the thick rod and the thin rod.

[0061] As Figure 8 and 9 shown in the figure, the parallelism measurement rod assembly locks the transition rod 18 on the parallelism measurement rod 17 by the second locking screw 19, the lever indicator 20 is assembled at one end of the gauge rod 21, and the gauge rod 21 is connected to the transition rod 18 through the locking device 22. The parallelism measurement rod 17 is a variable-diameter rod. Two chutes are machined along the generatrix direction of the thin rod part, and the two chutes are spaced 90° from each other. A hole is machined perpendicular to the rod body in the thick rod part for installing the transition rod 18.

[0062] When using the present utility model to measure the distortion degree of the end face of the large-end hole of the connecting rod 23 and the parallelism between the center line of the large-end hole of the connecting rod 23 and the center line of the small-end hole, the small-end hole of the connecting rod 23 is sleeved on the positioning hollow shaft 3, the lower edge of the large end of the connecting rod is placed on the support rod 5, the tapered mandrel 9 is tightened, and the three copper sliders 10 slide evenly outwards, fixing the connecting rod 23 while tightly pressing the inner surface of the small-end hole of the connecting rod 23.

[0063] As Figure 10 shown, after aligning the chute of the small-diameter part of the distortion degree measuring rod 13 with the limit pin 12 in the measuring conduit 4 and inserting it, the annular groove in the middle part of the thick rod and the thin rod reaches the position of the limit pin 12. Adjust the position of the dial indicator fixing rod 14 so that the measuring head of the dial indicator 15 just presses against the end face of the large-end hole of the connecting rod 23, and then tighten the locking screw 16. Press the distortion degree measuring rod 13 by hand and rotate it, driving the dial indicator 15 to make a circular rotation along the end face of the large-end hole of the connecting rod 23. During the rotation, read the readings of the dial indicator 15 at multiple positions, and then calculate the distortion degree of the end face of the large-end hole of the connecting rod 23 according to the size of the connecting rod aperture and the length of the connecting rod.

[0064] As Figure 11 shown, after aligning one of the chutes of the small-diameter part of the parallelism measuring rod 17 with the limit pin 12 in the measuring conduit 4 and inserting it, according to the inner diameter size of the large-end hole of the connecting rod 23, loosen the adjusting locking device 22 to adjust the positions of the transition rod 18 and the dial rod 21 so that the measuring head of the lever dial 20 just presses against the inner surface of the large-end hole of the connecting rod 23, and then tighten the locking device 22. Move the parallelism measuring rod 17 back and forth so that the measuring head of the lever dial 20 slides from the outer edge to the inner edge of the inner surface of the large-end hole of the connecting rod 23, read the changed readings of the lever dial 20, and then calculate the parallelism between the center line of the large-end hole of the connecting rod 23 and the center line of the small-end hole in this direction according to the distance from the outer edge to the inner edge of the inner surface of the large-end hole of the connecting rod 23. After aligning the other chute of the small-diameter part of the parallelism measuring rod 17 with the limit pin 12 in the measuring conduit 4 and inserting it, the parallelism between the center line of the large-end hole of the connecting rod 23 and the center line of the small-end hole in this direction can be measured according to the method described above.

[0065] As described above, it is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and inventive concept of the present utility model, making equivalent replacements or changes, should be covered within the protection scope of the present utility model.

Claims

1. A device for detecting the twist and parallelism of a connecting rod of an internal combustion engine, characterized in that: It includes a main structure, a torsion measuring rod assembly and a parallelism measuring rod assembly; The main structure comprises a vertical plate (1), a positioning hollow shaft (3), a measuring conduit (4) and a support rod (5) being vertically mounted on the front surface of the vertical plate (1), the positioning hollow shaft (3) being located on the right part of the vertical plate (1), the measuring conduit (4) and the support rod (5) being located on the left part of the vertical plate (1), and the measuring conduit (4) being arranged above the support rod (5); The interior of the positioning hollow shaft (3) is provided with a conical hole, the conical hole gradually shrinks toward the vertical plate (1), a conical core shaft (9) is provided in the conical hole, the positioning hollow shaft (3) is provided with three evenly distributed sliding grooves from the axis center line to the outer surface of the shaft, each sliding groove is installed with a copper slider (10), the outer ring of the positioning hollow shaft (3) and the sliding groove is provided with an annular groove, and an annular retaining ring (11) is provided in the annular groove.

2. The device for detecting the twist and parallelism of the connecting rod of an internal combustion engine according to claim 1, characterized in that: The twist measuring rod assembly comprises a twist measuring rod (13), wherein the twist measuring rod (13) is perpendicular to the vertical plate (1); The front part of the torsion measuring rod (13) is a thick rod, the rear part of the torsion measuring rod (13) is a thin rod, the front diameter of the torsion measuring rod (13) is larger than the rear diameter of the torsion measuring rod (13), and the rear part of the torsion measuring rod (13) is provided with a sliding groove along the direction of the rod generatrix; The front part of the torsion measuring rod (13) is connected to the upper part of the dial gauge fixing rod (14) through a first locking screw (16), and the lower part of the dial gauge fixing rod (14) is fixed with a dial gauge (15).

3. The device for detecting the twist and parallelism of the connecting rod of an internal combustion engine according to claim 2, characterized in that: An annular groove is provided between the front and rear parts of the torsion measuring rod (13).

4. The device for detecting the twist and parallelism of a connecting rod of an internal combustion engine according to claim 1, characterized in that: The parallelism measuring rod assembly comprises a parallelism measuring rod (17), wherein the parallelism measuring rod (17) is perpendicular to the vertical plate (1); The front part of the parallelism measuring rod (17) is a thick rod, and the rear part of the parallelism measuring rod (17) is a thin rod. The diameter of the front part of the parallelism measuring rod (17) is larger than the diameter of the rear part of the parallelism measuring rod (17). The rear part of the parallelism measuring rod (17) is provided with two slide grooves along the generatrix direction of the rod, and the two slide grooves are spaced 90 degrees apart. The front part of the parallelism measuring rod (17) is connected to the upper part of the vertically arranged transition rod (18) through a second locking screw (19), the lower part of the transition rod (18) is fixed with a gauge rod (21) through a locking device (22), and the rear end of the gauge rod (21) is fixed with a lever gauge (20).

5. The device for detecting the twist and parallelism of the connecting rod of an internal combustion engine according to claim 1, characterized in that: The bottom of the vertical plate (1) is connected to the horizontal bracket (2) via a fastening screw (8), and the number of the horizontal brackets (2) is two.

6. The device for detecting the twist and parallelism of the connecting rod of an internal combustion engine according to claim 1, characterized in that: The vertical plate (1) is provided with a plurality of spare holes (6) for assembling measuring conduits, the centers of the plurality of spare holes (6) for assembling measuring conduits and the center of the positioning hollow shaft (3) are on the same horizontal line, and the vertical plate (1) is provided with a plurality of spare holes (7) for assembling support rods, the center positions of the plurality of spare holes (7) for assembling support rods can meet the requirements of supporting connecting rods of different models.

7. The device for detecting the twist and parallelism of the connecting rod of an internal combustion engine according to claim 1, characterized in that: The outer surface of the copper slider (10) is flush with the outer surface of the positioning hollow shaft (3), and the inner surface of the copper slider (10) is an inclined surface adapted to the conical core shaft (9).

8. The device for detecting the twist and parallelism of connecting rods of an internal combustion engine according to claim 1, characterized in that: The tapered hole is provided with a straight hole at one end close to the vertical plate (1) and is processed with threads. The tapered mandrel (9) is provided with a straight shaft at one end close to the vertical plate (1) and the outer surface of the straight shaft is processed with threads. The tapered hole and the tapered mandrel (9) are connected by threads.

9. The device for detecting the twist and parallelism of a connecting rod of an internal combustion engine according to claim 1, characterized in that: A limit pin (12) is installed on the measuring conduit (4), and the limit pin (12) penetrates from the outer surface of the measuring conduit (4) to the inner hole.

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