A common rail pipe sealing end face to thread runout detection device

Abstract

The utility model belongs to the engine accessory production detection equipment field, propose a kind of common rail pipe sealing end face to thread runout detection device, including micrometer gauge, the micrometer gauge is arranged on supporting mechanism, the detection end of micrometer gauge is downward, the lower portion of micrometer gauge is provided with contact piece, the contact piece includes mandrel, the top of mandrel is used to contact the detection end of micrometer gauge, the eccentricity of the bottom of mandrel is provided with measuring needle, the bottom of measuring needle is used to contact the end face to be detected, the outside of contact piece is provided with gauge, the outer thread for cooperating with workpiece is provided on the gauge. The utility model is reasonable in design, simple in structure, convenient to operate, high in measurement precision and strong in compatibility, is favorable to meet the quality control demand of common rail pipe batch production, is suitable for large-scale popularization.

Description

Technical Field

[0001] This utility model belongs to the field of engine parts production and testing equipment, and in particular relates to a common rail pipe sealing end face thread runout detection device. Background Technology

[0002] As a core component of the common rail fuel system in diesel engines, the coaxiality and runout accuracy of the sealing end face and connecting thread of the common rail directly affect the sealing performance of the fuel system. If the runout of the common rail sealing end face to the thread exceeds the allowable range, it will lead to fuel leakage after assembly, which will affect engine power output, increase fuel consumption, and even cause engine failure. Currently, the industry primarily uses general-purpose testing equipment (such as coordinate measuring machines) or simple tooling to inspect the thread runout of common rail pipe sealing end faces. While coordinate measuring machines offer high precision, they are complex to operate and have low testing efficiency, making them unsuitable for online testing in mass production. Simple tooling typically uses V-blocks to position the common rail pipe and then a dial indicator to measure the sealing end face; however, this method suffers from the problem of misalignment between the positioning datum and the thread datum, easily leading to measurement errors. Furthermore, it has poor compatibility with different specifications of common rail pipes, requiring frequent tooling changes, further reducing testing efficiency. Moreover, when using coordinate measuring machines or other measurement methods, the results of multiple measurements of the thread pitch diameter vary significantly, making it difficult to achieve a consistent thread pitch diameter datum. Utility Model Content

[0003] This invention addresses the aforementioned technical problems in the testing of common rail pipes by proposing a common rail pipe sealing end face thread runout detection device. This device solves the problems of low efficiency, large errors in simple tooling, and poor compatibility of existing testing equipment, enabling rapid and accurate detection of the thread runout of the common rail pipe sealing end face, thus meeting the quality control requirements of common rail pipe mass production.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a common rail pipe sealing end face thread runout detection device, including a dial indicator, the dial indicator is mounted on a support mechanism, the probe end of the dial indicator faces downward, a contact element is provided below the dial indicator, the contact element includes a mandrel, the top end of the mandrel is used to contact the probe end of the dial indicator, the bottom of the mandrel is eccentrically provided with a probe, the bottom of the probe is used to contact the end face to be tested, and a gauge is provided on the outside of the contact element, the gauge is provided with an external thread for cooperating with the workpiece.

[0005] Preferably, the top end of the mandrel is a conical structure, and the side of the mandrel is provided with an annular protrusion.

[0006] Preferably, the external thread has the same thread accuracy as the workpiece's counterpart.

[0007] Preferably, the support mechanism includes a clamping assembly that cooperates with the dial indicator, the clamping assembly being disposed on a movable sleeve, and the movable sleeve being disposed on the indicator frame.

[0008] Preferably, the movable sleeve includes a back plate that mates with the watch holder and a front clamping plate that mates with the clamping assembly. The back plate is provided with a lifting hole that mates with the watch holder and a limiting groove that mates with the front clamping plate. The front clamping plate is provided with a horizontal hole that mates with the clamping assembly and a positioning screw for connecting the back plate.

[0009] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This invention provides a common rail pipe sealing end face thread runout detection device. The gauge, as a crucial component, has an external thread with the same precision as the thread of the workpiece's counterpart, such as a sensor or pressure relief valve. This ensures the coaxiality of the gauge's external thread and inner hole, further guaranteeing the coaxiality of the mandrel rotation and the thread. By observing the dial indicator value while rotating the mandrel, the runout value of the workpiece's sealing surface and thread can be determined. This invention features a reasonable design, simple structure, convenient operation, high measurement accuracy, and strong compatibility, making it suitable for meeting the quality control requirements of common rail pipe mass production and suitable for large-scale promotion. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 A front view of a common rail pipe sealing end face thread runout detection device provided in the embodiment; Figure 2 for Figure 1 A cross-sectional view of a common rail pipe sealing end face thread runout detection device in the HH direction; Figure 3 for Figure 2 An enlarged schematic diagram of a common rail pipe sealing end face thread runout detection device; Figure 4 A perspective view of a common rail pipe sealing end face thread runout detection device provided in the embodiment; Figure 5 A perspective view of a common rail pipe sealing end face thread runout detection device in another direction, provided for an embodiment; In the above figures: 1. Dial indicator; 2. Support mechanism; 21. Clamping assembly; 22. Movable sleeve; 221. Back plate; 222. Front clamping plate; 223. Lifting hole; 224. Limiting groove; 225. Horizontal hole; 226. Positioning screw; 23. Indicator holder; 3. Contact element; 31. Mandrel; 32. Stylus; 33. Ring protrusion; 4. Inspection tool; 5. Workpiece. Detailed Implementation

[0012] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0013] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0014] Examples, such as Figures 1-5 As shown, this utility model provides a common rail pipe sealing end face thread runout detection device, including a dial indicator 1, which is mounted on a support mechanism 2 with its probe end facing downward. A contact element 3 is provided below the dial indicator 1, and the contact element 3 includes a spindle 31. The top end of the spindle 31 is used to contact the probe end of the dial indicator 1, and a probe 32 is eccentrically provided at the bottom of the spindle 31. The bottom of the probe 32 is used to contact the end face to be tested. A gauge 4 is provided on the outside of the contact element 3, and the gauge 4 is provided with an external thread for cooperating with a workpiece 5.

[0015] Specifically, the end of workpiece 5 is provided with an internal threaded hole and a sealing surface to be tested. The main function of the internal threaded hole in the engine is to install a sensor or pressure relief valve. Workpiece 5 is placed at the testing station using a special tooling. The support mechanism 2 is set at the testing station, and its maximum support height meets the testing requirements. Its height can also be adjusted according to the specific testing environment. The dial indicator 1, as the measuring execution component, has an accuracy of not less than 0.001 mm, and its measuring end is generally a spherical probe. The measuring axis of the dial indicator 1 is perpendicular to the sealing end face of workpiece 5 to ensure the accuracy of the measurement data. Regarding the contact component 3, the spindle 31 is used as the key component for measuring runout, and its top is used to directly contact the spherical probe of the dial indicator 1. The head of the device has an eccentric probe 32 at its bottom that directly contacts the sealing surface of the workpiece 5. The center distance between the probe 32 and the mandrel 31, i.e., the eccentricity, is greater than the sealing end face of the common rail sensor or pressure relief valve. By rotating the measuring mandrel 31, the end of the probe 32 can float along the sealing end face. The floating value of the probe 32 can be obtained by rotating the mandrel 31, i.e., the difference between the highest and lowest points of the sealing end face can be measured, and thus the runout value can be determined. The gauge 4 is an important component for detection. Its external thread has the same precision as the thread of the workpiece 5's counterpart, such as the sensor or pressure relief valve, which can ensure the coaxiality of the gauge 4's external thread and internal hole, and further ensure the coaxiality of the rotation of the mandrel 31 and the thread. This utility model can obtain the runout value of the sealing section surface and the thread of the workpiece 5 by observing the reading of the dial indicator 1 while rotating the mandrel 31. The overall design is reasonable, the structure is simple, the operation is convenient, the measurement accuracy is high, and the compatibility is strong, which is conducive to meeting the quality control requirements of common rail mass production.

[0016] To improve the practicality of the mandrel 31, the top of the mandrel 31 provided by this utility model is a conical structure. The tip of the cone is much smaller than the spherical probe of the dial indicator 1. The extension and retraction margin of the spherical probe allows it to maintain contact with the mandrel 31, thereby obtaining the corresponding measurement value. At the same time, the side of the mandrel 31 provided by this utility model is provided with an annular protrusion 33. The diameter of the annular protrusion 33 is significantly larger than that of the mandrel 31, which allows for easy manual rotation / twisting of the annular protrusion 33, avoiding contact with the dial indicator 1 and affecting the measurement value.

[0017] To improve the measurement accuracy of this utility model, the external thread tapped on the side of the gauge 4 is consistent with the thread accuracy of the mating part of the workpiece 5. The mating part is a sensor or a pressure relief valve, which are the assembly components of the workpiece 5 in actual application scenarios. This ensures the coaxiality of the external thread of the gauge 4 and the inner hole of the workpiece 5, and further ensures the coaxiality of the rotation of the mandrel 31 and the thread.

[0018] To improve the utilization rate of this equipment, the support mechanism 2 provided by this utility model has height and level adjustment functions. The support mechanism 2 includes a clamping assembly 21 that cooperates with the dial indicator 1. The clamping assembly 21 is mounted on a movable sleeve 22, which is mounted on the instrument frame 23. The clamping assembly 21 includes two clamping blocks, one end of which is mounted on a crossbar, and the other end of each clamping block is connected by bolts. The opposite surfaces of the two clamping blocks form clamping openings for cooperating with the rod of the dial indicator 1. Tightening the bolts locks the dial indicator 1 in place. The movable sleeve 22 provides effective structural support for the height and level adjustment of the instrument frame 23 and the clamping assembly 21.

[0019] Furthermore, the movable sleeve 22 provided by this utility model includes a back plate 221 that mates with the dial indicator 23 and a front clamping plate 222 that mates with the clamping assembly 21. The back plate 221 is provided with a lifting hole 223 that mates with the dial indicator 23 and a limiting groove 224 that mates with the front clamping plate 222. The front clamping plate 222 is provided with a horizontal hole 225 that mates with the clamping assembly 21 and a positioning screw 226 for connecting the back plate 221. The limiting groove 224 is used to fit tightly against the front clamping plate 222, and the positioning screw 226 ensures the reliable connection between the front clamping plate 222 and the back plate 221. The lifting hole 223 and the dial indicator 23 form a lifting sliding pair, and the horizontal hole 225 and the clamping assembly 21 form a horizontal sliding pair. By adjusting the actual mating position of the two pairs of sliding pairs, the purpose of fine-tuning the detection node of the dial indicator 1 can be achieved. The two pairs of sliding pairs can be tightly fitted to obtain the corresponding reliability, or they can be fixed by a knob.

[0020] The back of the crossbar of the clamping assembly 21 is provided with a horizontal translation groove, and the back of the table frame 23 is provided with a lifting translation groove. The front clamping plate 222 and the rear back plate 221 are respectively provided with a locking knob that is threadedly connected to them. The end of the locking knob is used to contact and cooperate with the groove plane of the horizontal translation groove and the lifting translation groove to ensure the stability and reliability of the support mechanism 2 after adjustment.

[0021] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A common rail pipe sealing end face thread runout detection device, comprising a dial indicator, characterized in that, The dial indicator is mounted on the support mechanism with its probe facing downwards. A contact element is located below the dial indicator, and the contact element includes a spindle. The top end of the spindle is used to contact the probe end of the dial indicator, and a probe is eccentrically mounted at the bottom of the spindle. The bottom of the probe is used to contact the end face to be inspected. A gauge is located on the outside of the contact element, and the gauge has an external thread for mating with the workpiece.

2. The common rail pipe sealing end face thread runout detection device according to claim 1, characterized in that, The top of the mandrel is a conical structure, and the side of the mandrel is provided with annular protrusions.

3. The common rail pipe sealing end face thread runout detection device according to claim 2, characterized in that, The external thread has the same thread accuracy as the workpiece's counterpart.

4. The common rail pipe sealing end face thread runout detection device according to claim 3, characterized in that, The support mechanism includes a clamping assembly that cooperates with a dial indicator. The clamping assembly is disposed on a movable sleeve, which is disposed on the indicator frame.

5. The common rail pipe sealing end face thread runout detection device according to claim 4, characterized in that, The movable sleeve includes a back plate that mates with the watch holder and a front clamping plate that mates with the clamping assembly. The back plate is provided with a lifting hole that mates with the watch holder and a limiting groove that mates with the front clamping plate. The front clamping plate is provided with a horizontal hole that mates with the clamping assembly and a positioning screw for connecting the back plate.

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