A complex part position precision detection device and detection method

Abstract

The application relates to a complex part position precision detection device and a detection method, and belongs to the technical field of machining detection. The detection device comprises a measurement system I and a measurement system II; the measurement system I is used for detecting the coaxiality of multiple shaft holes of a part and the flatness of the end surface of the shaft hole; the measurement system II is used for detecting the symmetry of the two side walls of the rear end of the shaft hole of the part; the same central shaft is provided between the two measurement systems through a body. The measurement system I provides the coaxiality detection of three holes of the part through two discs and a threaded column mounted on the body, and provides the flatness detection of the end surface of the inner hole of the part through one disc and a measurement plate. The measurement system II judges the symmetry between the two through the clearance between the two side walls of the part and the central shaft. Compared with the prior art, the application has the advantages of simple structure, convenient operation, one-time comprehensive measurement of the symmetry between multiple elements such as the inner hole, the bottom surface, the thread and the two side surfaces of the cavity of the part, and ensured use performance after part assembly.

Description

TECHNICAL FIELD

[0001] The application relates to a complex part position precision detection device and a detection method, and belongs to the technical field of machining detection. BACKGROUND

[0002] The symmetry and coaxiality detection technology of machining parts usually adopts a table method or a special device detection method. According to the complexity of the structure of the parts, a suitable detection method is adopted. The table method is suitable for single-piece production, and the efficiency is low. The traditional special device is commonly used for the detection of two machining elements with symmetry requirements. The device has a simple structure and fewer detection elements. The existing machining requirements of a part are relatively high, and involve sawtooth threads, inner holes, special-shaped square grooves and other elements. The position requirements among the multiple elements are relatively high. For example, Figure 1 The part shown in the figure has a square shape, two concentric inner holes and a threaded hole in the middle, a square cavity in the vertical direction of the center, three holes that need to meet the coaxiality requirement, the two side walls of the square cavity that need to meet the symmetry requirement with the axis of the three inner holes, and the end face of the inner hole that needs to meet the flatness requirement. If the traditional detection device design concept is adopted, only the coaxiality of the sawtooth thread and the outer circle or the symmetry of the two surfaces can be ensured. However, according to the use requirements of the part, the position relationship among the inner hole, the thread, the special-shaped square groove symmetry, the coaxiality and the fitting clearance must be ensured to meet the actual use requirements of the part. Therefore, the existing detection technology is complex to operate, requires high detection personnel and has low efficiency, and it is difficult to meet the batch detection demand. Therefore, it is urgent to design a special detection system for such part detection requirements to realize the detection of the position relationship among all machining elements of the part at one time. SUMMARY

[0003] The application aims to overcome the defects of the prior art, and provides a complex part position precision detection device and a detection method, which are used for the detection of the mutual position relationship among machining elements such as inner holes, planes, threads and special-shaped groove side surfaces of a part, and realize the detection of all machining elements at one time to ensure the assembly accuracy of the parts and the use performance of the parts.

[0004] The application aims to realize the above-mentioned purpose through the following technical scheme.

[0005] In a first aspect, the application provides a complex part position precision detection device, which comprises a measurement system I and a measurement system II.

[0006] The measurement system I is used for detecting the coaxiality of multiple shaft holes of a part and the flatness of the end face of the shaft hole; the measurement system I comprises a disc I, a threaded column and a disc II fixed to the body, and a measurement plate, the disc I, the threaded column and the disc II are matched with the hole, the thread of the part in position, size and coaxiality, and the end face flatness of the disc II is matched with the flatness of the end face of the part; the measurement plate is used as a plug sheet for detecting the flatness of the end face of the hole of the part.

[0007] The measurement system II is used for detecting the symmetry of the two side walls of the rear end of the shaft hole of a part; the body provides a central axis for detecting the symmetry of the two side walls; the measurement system II comprises a sample column inserted into the central axis to extend the central axis to the square cavity between the two side walls of the part, a sample plate seat and a slider which can slide up and down on the inclined wall side of the sample plate seat, the sample plate seat is a right trapezoid, and the sample plate seat is provided with a scale line in the sliding range of the slider, which is used for judging the symmetry between the two side walls through the reading of the gap detection when detecting the symmetry of the two side walls of the square cavity.

[0008] As a preferred, the disc I and the disc II are both conical discs, the small end faces are inward, and the large end faces are outward.

[0009] As a preferred, the disc I is fixedly connected to the body through a sleeve, the sleeve is fixedly connected to the body through a thread, the disc I is circumferentially fixed to the sleeve through a key, and is axially fixed to the sleeve through a wire ring and a flange face.

[0010] As a preferred, after the threaded column is matched with the disc I through a stopper, the disc I is fixedly connected to the threaded column through a bolt and a nut.

[0011] As a preferred, the disc II is connected to the flange connecting face of the body through a screw; the disc II and the body are circumferentially fixed through a pin.

[0012] As a preferred, the sample column and the body are positioned through a taper face matching, the small taper face front end cylinder of the sample column provides the central axis for detecting the symmetry of the two side walls of the square cavity of the measurement system II, and the large taper face rear end cylinder of the sample column provides a hand-held handle.

[0013] As a preferred, the sample plate seat provides a sliding rail and clamping for the slider to slide up and down through a dovetail groove.

[0014] As a preferred, the sample plate seat and the slider are connected closely through a spring sheet.

[0015] As a preferred, a U-shaped hole is arranged on the sample plate seat to provide guidance for the slider to slide.

[0016] In the second aspect, the application provides a detection method of the device according to any one of the first aspect, comprising the following contents.

[0017] I. The disc II in the body of the measuring system I is pushed into the detection part of the coaxiality of the shaft hole of the part to be measured from outside to inside, and when the middle thread is encountered, the threaded column is screwed in until the end face of the disc II abuts against the end face of the inner hole of the part. If the disc II can abut against the end face of the inner hole of the part, the multiple shaft holes of the part meet the coaxiality requirement, and the coaxiality of the multiple shaft holes of the part is determined to be qualified. Otherwise, the coaxiality of the multiple shaft holes of the part is determined to be unqualified.

[0018] II. The measuring plate is inserted into the end face of the inner hole of the part at multiple points, and when one point can be inserted, it is determined that the flatness of the end face of the inner hole of the part is unqualified. Otherwise, it is determined that the flatness of the end face of the inner hole of the part is qualified.

[0019] III. The sample column is inserted into the center hole of the body, and the front cylindrical segment becomes the center axis of the square cavity of the part. The straight edge of the sample plate seat is tightly attached to one side wall of the square cavity of the part, the small end is pushed down, the large end is upward along the side wall, and when the sample plate seat cannot slide down, the scale position l1 of the sliding block is read. The sample plate seat is taken out, the sliding block is slid to the lowermost end of the sample plate seat, and then the straight edge of the sample plate seat is tightly attached to the other side wall of the square cavity of the part. The small end is pushed down, the large end is upward along the side wall, and when the sample plate seat cannot slide down, the scale position l2 of the sliding block is read. If l1 and l2 are inconsistent, it is determined that the symmetry of the two side walls of the square cavity of the part is unqualified. Otherwise, it is determined that the symmetry of the two side walls of the square cavity of the part is qualified.

[0020] Advantages

[0021] Compared with the prior art, the present application has the advantages of simple structure, convenient operation, and the ability to complete the comprehensive measurement of the symmetry between multiple elements such as the inner hole, bottom surface, thread, and two side surfaces of the cavity of the part at one time, thereby ensuring the use performance of the part after assembly. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of the structure of the part to be measured and the detection element;

[0023] Figure 2 is a schematic diagram of the overall structure of the complex part position precision detection device of the present application;

[0024] Figure 3 is a schematic diagram of the three-dimensional structure of the measuring system I;

[0025] Figure 4 is a schematic diagram of the three-dimensional structure of the measuring system II;

[0026] Figure 5 is a schematic diagram of the two-dimensional structure of the measuring system I;

[0027] Figure 6 is a schematic diagram of the two-dimensional structure of the measuring system II. DETAILED DESCRIPTION

[0028] The present application will be described in detail below with reference to specific embodiments shown in the drawings. However, these embodiments are not limited to the present application, and the structural, method, or functional changes made by those of ordinary skill in the art based on these embodiments are included within the scope of protection of the present application.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", and "connection" should be understood broadly, for example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] For the purpose, technical solution and advantages of the embodiments of the present application, the technical solution in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0032] The following will be described with reference to the parts shown in Figure 1 The present application is described. Figure 1 The part shown in the figure is square in shape, has two concentric inner holes and a threaded hole in the middle, has a lengthwise square cavity in the perpendicular direction of the center; the three holes (inner hole 1, inner hole 2 and threaded hole) need to meet the coaxiality requirement, the two side walls (faces 5 and 6) of the square cavity need to meet the symmetry requirement with the axis of the three inner holes, and the end face (face 4) of the inner hole needs to meet the flatness requirement.

[0033] As shown in Figures 2-6 A complex part position precision detection device is provided in the present application, which includes a measurement system I and a measurement system II.

[0034] The measurement system I is used for detecting the coaxiality of multiple shaft holes of the part and the flatness of the end face of the shaft hole; the measurement system I comprises a disc I 5, a threaded column 6 and a disc II 8 fixed to the body 2, and a measurement plate 13, the disc I 5, the threaded column 6 and the disc II 8 are matched with the hole, the thread of the part in position, size and coaxiality, and the end face flatness of the disc II 8 is matched with the flatness of the end of the part; the measurement plate 13 is used as a plug sheet for detecting the flatness of the end face of the hole of the part.

[0035] The measurement system II is used for detecting the symmetry of the two side walls of the rear end of the shaft hole of the part; the body 2 provides a central shaft for detecting the symmetry of the two side walls; the measurement system II comprises a sample column 1 inserted into the central shaft to extend the central axis to the square cavity between the two side walls of the part, a sample plate seat 17 and a sliding block 14 which can slide up and down on the inclined wall side of the sample plate seat 17, the sample plate seat 17 is a right trapezoidal body, and the sample plate seat 17 is provided with a scale line in the sliding range of the sliding block 14, which is used for judging the symmetry between the two side walls when detecting the symmetry of the two side walls of the square cavity through the reading of the gap detection.

[0036] The detection device is used for detecting the coaxiality of the three holes and the axial symmetry of the square cavity relative to the three holes, the sample column 1 extends the central shaft body 2 of the measurement system I to the square cavity, the symmetry of the two side walls of the square cavity is detected by the measurement system II, and multiple detection elements of the part are realized in one set of detection devices.

[0037] In a specific embodiment, the disc I 5 and the disc II 8 are both conical discs, the small end faces inward and the large end faces outward, so that when the symmetry of the multiple shaft holes is detected, on the one hand, interference with the elements of the part is avoided, the part is easily entered into the shaft hole, and the part is not abraded; on the other hand, the detection is completed through the line matching relationship.

[0038] In a specific embodiment, the disc I 5 and the body 2 are fixedly connected through the sleeve 3, the sleeve 3 is fixedly connected to the body 2 through threads, the disc I 5 is fixed to the sleeve 3 in the circumferential direction through the key 4, and the disc I 5 is fixed to the sleeve 3 in the axial direction through the flange surface of the wire ring 7 and the sleeve 3. Instead of directly fixing and installing the disc I 5 on the body 2, the sleeve 3 can realize quick disassembly and quick replacement of the measurement system I.

[0039] In a specific embodiment, after the threaded column 6 and the disc I 5 are matched through the stopper, the disc I 5 is fastened and connected to the threaded column 6 through bolts and nuts. Instead of directly fixing and installing the threaded column 6 on the body 2, the threaded column 6 is installed on the disc I 5, so that the center error of multiple measurement elements of the measurement system I can be eliminated, and the detection is more accurate.

[0040] In one embodiment, the disc II 8 is connected to the flange connection surface of the body 2 by a screw. The disc II 8 and the body 2 are reinforced by a pin to enhance the circumferential retention therebetween.

[0041] In one embodiment, the sample column 1 and the body 2 are positioned by a taper surface fit, the small taper front end cylinder of the sample column 1 provides a center axis for the symmetry detection of the two side walls of the square cavity of the measurement system II, and the large taper rear end cylinder of the sample column 1 provides a hand-held handle. The taper surface fit of the sample column 1 and the body 2 can facilitate the use of the sample column 1 while accurately transferring the detection reference center to the center axis of the square cavity.

[0042] In one embodiment, the sample plate seat 17 is provided with a dovetail groove to provide a sliding rail and clamping for the up-and-down sliding of the sliding block 14. The dovetail groove can minimize the sliding connection structure between the sample plate seat 17 and the sliding block 14.

[0043] In one embodiment, the sample plate seat 17 and the sliding block 14 are connected more closely to each other by the spring sheet 16. Since the sample plate seat 17 and the sliding block 14 are connected by up-and-down sliding, the sliding block 14 is prone to falling under the action of gravity. To improve the connection between the two, the spring sheet 16 is installed between the two, so that the sliding block 14 is lifted to the top of the dovetail groove under the action of the spring force, increasing the friction between the two.

[0044] In one embodiment, the sample plate seat 17 is provided with a U-shaped hole to provide guidance for the sliding of the sliding block 14. Although the dovetail groove type sliding rail structure can provide guidance for the sliding of the sliding block 14, when the gap between the dovetail table of the sliding block 14 and the dovetail groove of the sample plate seat 17 is relatively large, the measurement error caused by the sliding of the sliding block 14 will be larger, affecting the symmetry discrimination result of the two side walls of the square cavity. At this time, the U-shaped hole and the bolt passing through the sliding block 14 and extending into the U-shaped hole limit the sliding block 14 to slide accurately along the hole, improving the measurement accuracy of the gap between the side walls of the square cavity and the center axis.

[0045] The following is a specific example, for the part as shown in Figure 1 , a complex part position precision detection device as shown in Figures 2-6 , includes a measurement system I and a measurement system II.

[0046] The measurement system I includes: a body 2, a sleeve 3, a key 4, a disc I 5, a threaded sample column 6, a wire coil 7, a disc II 8, a bolt 9, a nut 10, a screw I 11, a pin I 12, and a measurement plate 13.

[0047] The assembly relationship of the parts of the measurement system I is as follows:

[0048] The outer circle of the body 2 has a rectangular thread at one end, and the sleeve 3 has a corresponding rectangular thread inside, which is connected to the outer circle of the body 2 at one end by the rectangular thread.

[0049] The other end of the outer circle of the body 2 is a flange connection surface, and the flange connection surface has screw holes and pin holes. The conical disc 8 has corresponding screw holes and pin holes, and the flange surface is connected with the conical disc 8 through the screw I11 and the pin I12.

[0050] The outer circle of the sleeve 3 has a key groove in the middle, and the inner hole of the conical disc 5 has a corresponding key groove. The key 4 is put into the key groove of the outer circle of the sleeve 3, the inner hole key groove of the conical disc 5 is aligned with the key 4, and the conical disc 5 is assembled on the sleeve 3. At this time, the conical disc 5 and the sleeve 3 are connected through the key 4 to prevent mutual rotation in the circumferential direction.

[0051] One side of the outer circle of the sleeve 3 is a normal thread, and the other side has a flange surface. The inner hole of the wire ring 7 has a corresponding thread, and the wire ring 7 is connected through the thread and screwed onto the sleeve 3. The right end surface of the conical disc 5 is in contact with the flange surface on one side of the outer circle of the sleeve 3, and the conical disc 5 and the sleeve 3 are axially positioned.

[0052] The conical disc 5 has six bolt holes on the outer circle, one side has a matching stop, the threaded column 6 has corresponding bolt holes, and the inner hole has a matching stop. After the conical disc 5 and the threaded column 6 are matched through the stop, the conical disc 5 and the threaded column 6 are connected and tightened by the bolt 9 and the nut 10.

[0053] Because the coaxialities of the measured parts face 1, face 2 and face 3 are relatively low, in order to ensure that the conical disc 5 and the conical disc II 8 can smoothly enter when cooperating with the measured parts face 1 and face 3, the outer circle of the conical disc 5 and the conical disc II 8 is designed as a conical surface. When cooperating with the measured part, the small end of the conical disc II 8 enters the measured part face 3 first, then the cylindrical serrated thread of the threaded column 6 is screwed with the measured part face 2, and when screwed to a certain distance, the small end of the conical disc 5 enters the measured part face 1. When the face 7 of the conical disc II 8 is in contact with the measured part face 4, at this time, the conical disc 5, the conical disc II 8 and the two inner holes (inner holes 1 and 2) formed by the parts are in line contact, and it can be determined that the coaxialities of the measured parts face 1, face 2 and face 3 are qualified.

[0054] The outer circle of the threaded column 6 is a straight cylindrical surface serrated thread, and when detecting the coaxiality, the serrated thread of the outer circle of the threaded column 6 cooperates with the measured part face 2 (threaded surface).

[0055] The main functions of the body 2 are: first, to connect the sleeve 3, the conical disc 5, the threaded column 6, the conical disc II 8 and other parts; second, to position the sample column 1 accurately when detecting the symmetry.

[0056] The hole in the body 2 is a taper hole, the middle part of the outer circle of the sample column 1 is a conical surface, and the outer conical surface of the sample column 1 is matched with the inner taper hole of the body 2. The two ends of the outer circle of the sample column 1 are cylindrical surfaces, one end is a handle, and the other end is a detection end. When detecting the symmetry, the sample column 1 is inserted into the body 2, and the taper surfaces are tightly matched. At this time, the other end of the sample column 1 is located in the middle position of the square cavity of the measured part, and the other end is matched with the measurement system II to complete the symmetry detection of the two sides (surfaces 5 and 6) of the square cavity of the measured part.

[0057] The measurement plate 13 is used to detect the flatness of the surface 4 (i.e. the end surface of the inner hole) of the measured part and the end surface gap after the assembly of the measured part with other parts.

[0058] The measurement system II includes a sliding block 14, a screw II 15, a spring sheet 16, a sample plate seat 17, a sliding groove plate 18, a pin II 19, and a screw III 20, which are used for detecting the symmetry of the measured part.

[0059] The assembly relationship of the parts of the measurement system II is as follows:

[0060] The side of the sample plate seat 17 with a scale line is a bevel, and the other side is a straight surface. The size of the small head of the bevel is smaller than the theoretical gap formed by the sample column 1 and the surface 5 after the sample column 1 enters the square cavity. This is mainly to ensure that the small head of the bevel of the sample plate seat 17 can pass through the gap formed by the sample column 1 and the surface 5 when the sample plate seat 17 moves downward. When the small head of the bevel of the sample plate seat 17 passes through the gap between the sample column 1 and the surface 5, the sample plate seat 17 can continue to move downward to form the initial position for detecting the symmetry. The initial position is that the surface 8 of the sliding block 14 is aligned with the left end of the scale line of the sample plate seat 17. When the sample plate seat 17 continues to move downward, the sliding block 14 slides upward relative to the sample plate seat 17 until the sample plate seat 17 cannot move downward any more. At this time, the relative position of the surface 8 of the sliding block 14 and the scale line of the sample plate seat 17 is recorded, and the gap detection between the sample column 1 and the surface 5 of the measured part is completed. According to the same measurement method as the surface 5 of the part, the gap between the sample column 1 and the surface 6 is measured. By comparing the two gap data, it is finally determined whether the symmetry of the surfaces 5 and 6 of the measured part to the center is appropriate.

[0061] The sample plate seat 17 has two bolt holes and one pin hole, and has a half dovetail groove. The sliding groove plate 18 also has two through holes and a pin hole, and has a half dovetail groove. The sample plate seat 17 is connected with the sliding groove plate 18 through the screw III 20 and the pin II 19. At the same time, after the sample plate seat 17 is connected with the sliding groove plate 18, a complete dovetail groove is formed by the half dovetail grooves of the two parts.

[0062] The sample base 17 is provided with a U-shaped hole and a measuring scale, the sliding block 14 is provided with a dovetail, a screw hole and a measuring reference, the spring sheet 16 is provided with a corresponding through hole, the screw II 15 is provided with a thread on the upper part and a smooth surface on the lower part. The spring sheet 16 is placed below the dovetail of the sliding block 14, the screw hole is aligned with the through hole, and they are inserted into the complete dovetail groove together. The screw II 15 is screwed into the screw hole of the sliding block 14 and the through hole of the spring sheet 16, so as to ensure that the measuring reference of the sliding block 14 is aligned with the first scale on the left side of the measuring scale of the sample base 17. The spring sheet 16 ensures that the dovetail of the sliding block 14 is tightly matched with the complete dovetail groove. At this time, the smooth surface on the lower part of the screw II 15 is matched with the U-shaped hole of the sample base 17 to guide the sliding block 14 when it slides up and down. That is, through the guidance of the smooth surface on the lower part of the screw II 15 and the U-shaped hole of the sample base 17, the sliding block 14 and the spring sheet 16 can slide up and down along the dovetail groove without shaking.

[0063] When the symmetry is detected, the sample column 1 in the measuring system I is matched with the sliding block 14 in the measuring system II. The position of the measuring reference of the sliding block 14 and the measuring scale of the sample base 17 is observed by eyes, and the corresponding data is read.

[0064] Method for use:

[0065] 1. The threaded column 6 of the measuring system I is connected with the measured part by using a zigzag thread. The threaded column 6 is screwed into the thread of the surface 2 of the measured part. The outer conical surface of the conical disc I 5 and the conical disc II 8 faces the measured part. After the surface 7 of the conical disc II 8 is attached to the surface 4 of the measured part, the screwing action is stopped. At this time, the outer conical surfaces of the conical disc I 5 and the conical disc II 8 are matched with the surfaces 1 and 3 of the measured part respectively.

[0066] 2. The zigzag thread of the surface 2 of the measured part, the surface 1 (inner hole 1) and the surface 3 (inner hole 2) are detected by the threaded column 6, the conical disc I 5 and the conical disc II 8.

[0067] 3. The measuring plate 13 is inserted into the gap formed between the surface 7 of the conical disc II 8 and the surface 4 of the measured part. If the measuring plate 13 cannot be inserted in any direction in the circumference, then the matching gap between the surface 4 of the measured part and the surface 7 of the conical disc II 8 is qualified. Since the flatness of the surface 7 of the conical disc II 8 is 0, the flatness of the surface 4 of the measured part is indirectly guaranteed.

[0068] 4. The detection end of the sample column 1 is inserted into the body 2 with the detection end facing the measured part. The outer conical surface of the sample column 1 is matched with the inner conical surface of the body 2. After the conical surfaces are completely matched, the insertion action is stopped. At this time, the left end surface of the sample column 1 and the left end surface of the conical disc II 8 have a size of 185, and the detection end of the sample column 1 is located in the middle position of the square cavity of the measured part.

[0069] 5, insert the measuring system II into the gap formed by the two side faces of the square cavity of the measured part and the detection end of the sample column 1, during the insertion process, the straight edge of the measuring system II sample block 17 moves downward along the side face 5 of the measured part; until the tapered surface of the measuring system II contacts the small end outer circle of the sample column 1, at this time, the side face (i.e. face 8) of the sliding block 14 is aligned with the first scale line of the sample block 17, the straight edge of the measuring system II sample block 17 continues to move slightly downward along the side face 5 of the measured part, the small end outer circle of the sample column 1 drives the sliding block 14 of the measuring system II to move slightly upward along the dovetail groove, until the tapered surface of the measuring system II is in close contact with the small end outer circle of the sample column 1 and cannot continue to move downward, at this time, the gap between the face 5 and the small end outer circle of the sample column 1 is determined by observing the position of the face 8 of the measuring sliding block 14 relative to the scale line of the sample block 17;

[0070] 6, detect the gap between the face 6 of the measured part and the small end outer circle of the sample column 1 according to the method of step 5;

[0071] 7, compare the gap data of step 5 and step 6, and finally realize the detection of the symmetry of the measured part; that is, if they are the same or within a predetermined threshold range, it is considered that the symmetry of the two side walls (face 5 and face 6) of the part is qualified; otherwise, it is determined that the symmetry of the face 5 and the face 6 is unqualified.

[0072] 8, after use, the sample column 1 is extracted from the measuring system I body 2, and then the measuring system I is rotated out of the measured part.

[0073] Through practice test, by using the present application, the comprehensive measurement of the coaxiality, symmetry and flatness between multiple elements such as the inner hole, bottom surface, thread and cavity of the part can be completed at one time, the use performance after assembly of the part is ensured, and the detection efficiency during batch detection is greatly improved; and the measuring device has simple structure, convenient operation, low requirement for the operator and high detection precision.

[0074] In order to illustrate the content and embodiments of the present application, specific examples are given in the specification. The purpose of introducing details in the examples is not to limit the scope of the claims, but to help understand the content described in the present application. Those skilled in the art should understand that although the present application is described in the form of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments which can be understood by those skilled in the art. And various modifications, changes or replacements of the steps of the best embodiment are possible without departing from the spirit and scope of the present application and the appended claims. Therefore, the present application should not be limited to the content disclosed in the best embodiment and the drawings.

Claims

1. A complex part position accuracy detection device, characterized by: It comprises a measuring system I and a measuring system II. The measuring system I is used for detecting the coaxiality of multiple shaft holes of a part and the flatness of the end face of the shaft hole; the measuring system I comprises a disc I (5), a threaded column (6) and a disc II (8) fixed to a body (2), and a measuring plate (13), the disc I (5), the threaded column (6) and the disc II (8) are matched with the hole, the thread of the part in position, size and coaxiality respectively, and the flatness of the end face of the disc II (8) is matched with the flatness of the end face of the part; the measuring plate (13) is used as a plug sheet for detecting the flatness of the end face of the hole of the part. The measuring system II is used for detecting the symmetry of the two side walls of the rear end of the shaft hole of the part; the body (2) provides a central axis for detecting the symmetry of the two side walls; the measuring system II comprises a sample column (1) inserted into the central axis to extend the central axis to the square cavity between the two side walls of the part, a sample plate seat (17) and a sliding block (14) which can slide up and down on the inclined wall side of the sample plate seat (17); the main body of the sample plate seat (17) is a right-angled trapezoid; the sample plate seat (17) is provided with a scale line in the sliding range of the sliding block (14) for judging the symmetry between the two side walls through the reading of the gap detection when detecting the symmetry of the two side walls of the square cavity.

2. The apparatus of claim 1, wherein: The disc I (5) and the disc II (8) are both conical discs, the small end faces of which face inward and the large end faces of which face outward.

3. The apparatus of claim 1, wherein: The disc I (5) is fixedly connected with the body (2) through a sleeve (3), the sleeve (3) is fixedly connected with the body (2) through a thread, the disc I (5) is circumferentially fixed in the sleeve (3) through a key (4), and the disc I (5) is axially fixed in the sleeve (3) through a wire ring (7) and a flange face.

4. The apparatus of claim 3, wherein: After the threaded column (6) is matched with the disc I (5) through a stop opening, the disc I (5) is fixedly connected with the threaded column (6) through a bolt and a nut.

5. The apparatus of claim 1, wherein: The disc II (8) is connected with the flange connecting surface of the body (2) through a screw; the disc II (8) and the body (2) are circumferentially fixed through a pin.

6. The apparatus of claim 5, wherein: The sample column (1) is positioned with the body (2) through a conical surface matching; the small conical front end cylinder of the sample column (1) provides a central axis for detecting the symmetry of the two side walls of the square cavity of the measuring system II, and the large conical rear end cylinder of the sample column (1) provides a hand-held handle.

7. The apparatus of claim 1, wherein: The sample plate seat (17) provides a sliding rail and clamping for the sliding block (14) to slide up and down through a dovetail groove.

8. The apparatus of claim 7, wherein: The sample plate seat (17) and the sliding block (14) are connected closely with each other through a spring sheet (16).

9. The apparatus of claim 8, wherein: The sample plate seat (17) is provided with a U-shaped hole to provide guidance for the sliding block (14) to slide.

10. The method of claim 1-8, wherein: The following contents are included: I. The disc II (8) inside and the disc I (5) outside of the measuring system I body (2) are pushed into the coaxiality detection position of the shaft hole of the part from outside to inside; when the middle threaded part is encountered, the threaded column (6) is screwed in until the end face of the disc II (8) abuts against the end face of the inner hole of the part; if the disc II (8) can abut against the end face of the inner hole of the part, the multiple shaft holes of the part meet the coaxiality requirement, and it is determined that the coaxiality of the multiple shaft holes of the part is qualified; otherwise, it is determined that the coaxiality of the multiple shaft holes of the part is unqualified. II. The measuring plate (13) is inserted into the part hole end face at multiple points, and if one point can be inserted, it is determined that the part hole end face flatness is unqualified; otherwise, it is determined that the part hole end face flatness is qualified; III. The sample column (1) is inserted into the center hole of the body (2), and the front cylindrical section becomes the center axis of the part square cavity; the slide block (14) slides to the lowermost end of the sample plate seat (17), the straight edge of the sample plate seat (17) is tightly attached to one side wall of the part square cavity, the small end is pushed down, the large end is upward along the side wall, and when the sample plate seat (17) cannot slide down, the scale position l1 of the slide block (14) is read; the sample plate seat (17) is taken out, the slide block (14) slides to the lowermost end of the sample plate seat (17), and then the straight edge of the sample plate seat (17) is tightly attached to the other side wall of the part square cavity, the small end is pushed down, the large end is upward along the side wall, and when the sample plate seat (17) cannot slide down, the scale position l2 of the slide block (14) is read; l1 and l2 are compared, if they are inconsistent, it is determined that the symmetry of the two side walls of the part square cavity is unqualified; otherwise, it is determined that the symmetry of the two side walls of the part square cavity is qualified.

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