Device and method for detecting starting point size of fixed-starting-point spiral structure

Abstract

The invention provides a device and a method for detecting the starting point size of a fixed-starting-point spiral structure. The detection device comprises a base, a mandrel, a clamping assembly and a measuring assembly. And the mandrel passes through a workpiece to be detected. In the clamping assembly, an axial clamping assembly comprises two positioning plates and a first jacking screw, the positioning plates are fixed to the base and support the two ends of the mandrel, and the first jacking screw penetrates through one positioning plate to axially jack a workpiece on the other positioning plate; the radial clamping assembly comprises two stand columns, a pressing plate and a second jacking screw, the pressing plate is connected to the base through the stand columns, and the second jacking screw penetrates through the pressing plate to jack the workpiece to the base in the radial direction. In the measuring assembly, a through sample column, a stop sample column, a distance measuring seat and an angle measuring seat can detect whether the spiral section distance and the spiral included angle of the spiral structure of the workpiece are qualified or not, wherein the distance measuring seat and the angle measuring seat correspond to thread heads of the workpiece in number. According to the invention, screwing of a spiral gauge and the spiral structure is avoided, whether the starting point size of the fixed-starting-point spiral structure is qualified can be accurately measured, and the detection efficiency is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of spiral structure detection, and in particular relates to a detection device for detecting the starting point size of a spiral structure with a fixed starting point and a detection method for detecting the starting point size of a spiral structure with a fixed starting point by using the detection device. Background Art

[0002] There are countless threads of the same nature around the cylindrical surface, but there is only one thread that meets the starting point requirements. This thread can be controlled by the starting position size, such as section distance and radial section angle. Therefore, it is necessary to detect the starting size of the fixed starting point spiral structure. Only when the starting size meets the requirements can the thread of the spiral structure be qualified.

[0003] At present, a spiral gauge is usually used to detect the starting point size of a fixed-starting spiral structure. However, when the axial length of the spiral structure is much smaller than a pitch, it is difficult to accurately measure the starting point size due to insufficient screwing of the spiral gauge. In addition, when using a spiral gauge for detection, the detection process is completely dependent on manual labor, which is inconvenient to operate and has low detection efficiency. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art of using a spiral gauge to detect the starting point size of a spiral structure with a fixed starting point, resulting in inaccurate starting point position measurement and low detection efficiency. A detection device for the starting point size of a spiral structure with a fixed starting point and a detection method for detecting the starting point size of a spiral structure with a fixed starting point using the detection device are provided. The starting point size of the spiral structure is measured by clamping the spindle and positioning the main measuring tool, using auxiliary through and stop sample columns to pass through the point position of the main device.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] On the one hand, a device for detecting the starting point size of a fixed-starting point spiral structure is provided, comprising a base, a spindle, a clamping assembly and a measuring assembly;

[0007] The base is used to support the spindle, the clamping assembly, the measuring assembly and the workpiece to be measured;

[0008] The spindle is used to coaxially pass through the workpiece to be measured to fix the workpiece to be measured;

[0009] The clamping assembly is used to clamp the workpiece to be measured on the base, and includes an axial clamping assembly and a radial clamping assembly;

[0010] The axial clamping assembly includes two positioning plates and a first tightening screw. The positioning plates are fixed to the base and are used to support the two ends of the spindle respectively. The first tightening screw passes through one of the positioning plates to axially tighten the workpiece to be measured on the other positioning plate.

[0011] The radial clamping assembly includes two columns, a pressure plate and a second tightening screw. The pressure plate is connected to the base through the columns. The second tightening screw passes through the pressure plate and tightens the workpiece to the base radially.

[0012] The measuring assembly includes a sample-through column, a sample-stop column, an angle measuring seat, and a number of distance measuring seats corresponding to the number of thread heads of the workpiece to be measured;

[0013] The distance measuring seat and the angle measuring seat are mounted on the base on the same side of the spindle, and are respectively used to detect whether the spiral cross-sectional distance and the spiral angle at the starting point of the spiral structure of the measured workpiece are qualified, and each is provided with a detection hole along the radial direction of the spindle, and the center of the two or more holes on each distance measuring seat is located on a straight line parallel to the axis of the spindle;

[0014] The through sample column and the stop sample column are used to pass through the detection holes on the distance measuring seat and the angle measuring seat respectively, so as to detect whether the starting point size of the spiral structure of the measured workpiece is qualified.

[0015] Furthermore, the radial clamping assembly also includes a backing plate, which is fixed to the base between the two positioning plates, and the second tightening screw passes through the pressure plate to radially tighten the workpiece to be measured to the backing plate.

[0016] Furthermore, two groups of measuring components are provided, which are symmetrically arranged on both sides of the spindle and are used to measure left-hand threads and right-hand threads respectively.

[0017] Further, the dimensions of the ends of the sample-passing column and the sample-stopping column that are in contact with the workpiece to be measured are obtained according to the following process:

[0018] Step 1, converting the point of the starting size of the spiral structure into the sample column position point: constructing a model of the workpiece to be measured, selecting a point on each spiral line of the spiral structure parallel to the axis of the model as the spiral cross-section distance point, selecting a point on one of the spirals as the spiral angle point, and the circumferential surface of the spiral point is connected with the spiral surfaces on both sides of the spiral structure, completing the position conversion by sampling points or calculating the spiral equation through the solid model composition, determining the sample column position point and the sample column execution section size, and the cylindrical surface of the sample column at each position point is fitted with the spiral surface on the same side of the spiral structure at the position where the corresponding spiral point is connected with the spiral surface;

[0019] Step 2, conversion of the distance between the spiral section and the point: converting the distance between the section and the point into the coordinate size of the center of the sample column position point;

[0020] Step 3, helical angle point size conversion: convert the helical angle point size into the coordinate size of the sample column position point center;

[0021] Step 4, conversion of starting point dimension tolerance: convert the spiral point dimension tolerance into the execution segment dimension of the general sample column and the execution segment dimension of the stop sample column through the image method or formula method.

[0022] Furthermore, the sample passing column and the sample stopping column are realized by the same sample column, or by two sample columns.

[0023] Furthermore, the positioning plate is in the shape of an elongated strip and has a groove in the middle for receiving the spindle, and through holes are provided at both ends for connecting the positioning plate to the base.

[0024] Furthermore, the positioning plate has two vertically extending protrusions in the middle, and a groove is formed between the two protrusions.

[0025] Furthermore, the measuring assembly also includes sleeves corresponding to the number of the distance measuring seats and the angle measuring seats, and the sleeves are inserted into the detection holes on the distance measuring seats and the angle measuring seats one by one to pass through the sample passing column and the sample stopping column.

[0026] Furthermore, both the distance measuring seat and the angle measuring seat are L-shaped structures and include two legs, one of which is used to connect the distance measuring seat or the angle measuring seat to the base, and the other leg is used to pass through the sample passing column and the sample stopping column.

[0027] On the other hand, a method for detecting the starting point size of a spiral structure with a fixed starting point is provided, wherein the starting point size of the spiral structure with a fixed starting point is detected using the above detection device, and the method comprises the following steps:

[0028] Step 1, inserting the workpiece to be measured into the mandrel coaxially;

[0029] Step 2, placing the mandrel with the workpiece to be measured on two positioning plates, with the surface of the workpiece opposite to the base in contact with the base;

[0030] Step 3, tighten the first tightening screw on one of the positioning plates to tighten the workpiece axially, so that the workpiece is in seamless contact with the other positioning plate, and use a feeler gauge for detection;

[0031] Step 4, install the pressure plate on the column, screw the second tightening screw, radially tighten the workpiece to be tested, make the workpiece contact seamlessly with the base, and use a feeler gauge for testing;

[0032] Step 5, insert the through-sample column and the stop-sample column into the detection holes on the distance measuring seat and the angle measuring seat respectively; if the through-sample column can contact the spiral surface at the cross section of the spiral starting point of the measured workpiece, and the stop-sample column cannot contact the spiral surface at the cross section of the spiral starting point, then the spiral cross-sectional distance of the measured workpiece is judged to be qualified; otherwise, the spiral cross-sectional distance of the measured workpiece is judged to be unqualified; if the through-sample column can contact the spiral surface at the cross section of the spiral starting point of the measured workpiece, and the stop-sample column cannot contact the spiral surface at the cross section of the spiral starting point, then the spiral angle of the starting point of the measured workpiece is judged to be qualified; otherwise, the spiral angle of the starting point of the measured workpiece is judged to be unqualified.

[0033] The advantages of the present invention are:

[0034] The device and method for detecting the starting point size of a spiral structure with a fixed starting point of the present invention are as follows: the workpiece to be measured passes through a mandrel, the mandrel is installed on a base, the workpiece is axially and radially tightened, and the through-sample column and the stop-sample column can pass through a distance measuring seat fixed to the base on one side of the workpiece to detect whether the cross-sectional distance of the spiral line of the spiral structure of the workpiece is qualified, and can also pass through an angle measuring seat fixed to the base to detect whether the spiral angle of the spiral structure is qualified. Therefore, the present invention avoids the use of a spiral gauge to be screwed with the spiral structure, and can accurately measure whether the starting point size of the spiral structure with a fixed starting point is qualified. At the same time, during the detection process, after the workpiece is clamped, only the through-sample column and the stop-sample column need to be operated to complete the detection, and the detection efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or other features and advantages of the present invention will become more easily understood through the following description with reference to the accompanying drawings, which are not drawn to scale and some features are exaggerated or reduced to show details of specific components. In the accompanying drawings:

[0036] Figure 1 It is a schematic diagram of a device for detecting the starting point size of a fixed starting point spiral structure of the present invention;

[0037] Figure 1A yes Figure 1 The main view;

[0038] Figure 1B yes Figure 1 A top view of

[0039] Figure 1C yes Figure 1 Right view of;

[0040] Figure 2 Schematic diagram of the fixed starting point spiral structure detected by the present invention;

[0041] Figure 2A yes Figure 2 The main view;

[0042] Figure 2B It is along Figure 2A An axial cross-sectional view taken along line AA;

[0043] Figure 2C yes Figure 2A A normal section view taken along line CC;

[0044] Figure 3 It is a schematic diagram of the detection position of the sample column in the present invention;

[0045] Figure 3A yes Figure 3 The main view;

[0046] Figure 3B It is along Figure 3A A cross-sectional view taken along line FF;

[0047] Figure 4 is a schematic diagram of a base in the present invention;

[0048] Figure 5 is a schematic diagram of the central axis of the present invention;

[0049] Figure 5A is a schematic diagram of the working portion of the central shaft of the present invention;

[0050] Figure 5B is a schematic diagram of the handle portion of the central shaft of the present invention;

[0051] Figure 6 is a schematic diagram of a positioning plate in the present invention;

[0052] Figure 7 is a schematic diagram of a column in the present invention;

[0053] Figure 8 is a schematic diagram of a pressure plate in the present invention;

[0054] Fig. 9 is a schematic diagram of the angle measuring seat in the present invention;

[0055] Fig.10 is a schematic diagram of a distance measuring seat in the present invention;

[0056] Fig.11 is a schematic diagram of a sample column in the present invention;

[0057] Fig.12 is a schematic diagram of a pad in the present invention;

[0058] Fig.13 It is a schematic diagram of the sleeve in the present invention.

[0059] In the figure: 1-base; 2-spindle, 201-working part, 202-handle part; 3-positioning plate, 301-groove, 302-countersunk hole, 303-protrusion; 4-first tightening screw; 5-column; 6-pressing plate; 7-second tightening screw; 8-sample column; 9-angle measuring seat; 10-distance measuring seat; 11-shim plate; 12-sleeve; 13-slotted screw; 14-taper pin; 100-measured workpiece. DETAILED DESCRIPTION

[0060] The present invention will be described in detail below with reference to the accompanying drawings by means of exemplary embodiments of the present invention. It should be noted that the following detailed description of the present invention is only for the purpose of illustration, and is not intended to limit the present invention.

[0061] It should be pointed out that, in the context of the present invention, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise" and "counterclockwise" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0062] In addition, terms such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0063] The present invention provides a device for detecting the starting point size of a spiral structure with a fixed starting point and a detection method for detecting the starting point size of a spiral structure with a fixed starting point using the detection device. The device is used for positioning the device with a main measuring tool by clamping a spindle, and using auxiliary pass and stop sample columns to pass through the points of the main device, so as to quickly and accurately detect the starting point size of the spiral structure with a fixed starting point.

[0064] First, the device for detecting the starting point size of the fixed-starting point spiral structure provided by the present invention is described.

[0065] Reference Figures 1 to 1C As an exemplary embodiment of the present invention, a device for detecting the starting point size of a spiral structure with a fixed starting point includes a base 1, a spindle 2, a clamping assembly and a measuring assembly. The base 1 is used to support the spindle 2, the clamping assembly, the measuring assembly and the workpiece 100 to be measured. The spindle 2 is used to coaxially pass through the workpiece 100 to fix the workpiece 100 to be measured. The clamping assembly is used to clamp the workpiece 100 to be measured on the base 1. The measuring assembly is used to detect the starting point size of the spiral structure of the workpiece 100 to be measured through the sample column 8, that is, the through sample column and the stop sample column and a plurality of measuring seats. Specifically, the angle measuring seat is used to detect whether the spiral angle of the starting point of the spiral structure of the workpiece to be measured is qualified, and the distance measuring seat is used to detect whether the spiral cross-sectional distance of the starting point of the spiral structure of the workpiece to be measured is qualified, and the number corresponds to the number of thread heads of the workpiece 100 to be measured. During inspection, if the through sample column contacts the spiral surface at the starting point section of the spiral of the workpiece being measured after passing through each measuring seat, and the stop sample column cannot contact the spiral surface at the starting point section of the spiral after passing through each measuring seat, it can be determined that the starting point size of the spiral structure of the workpiece being measured 100 is qualified.

[0066] The present invention exemplarily takes the spiral structure of the workpiece 100 to be measured as a double-headed rectangular spiral structure as an example to illustrate the design conception process of the detection device. Similar steps can be adopted for other spiral structures:

[0067] Step S1, convert the starting point of the spiral structure into the sample column position point: Figures 2 to 2C As shown in the figure, the model of the workpiece to be measured can be constructed using CAD software. On each spiral of the spiral structure, a point parallel to the axis of the model is selected as the spiral section distance point, and a point on one of the spirals is selected as the spiral angle point. The circumferential surface of the spiral point is connected to the spiral surfaces on both sides of the spiral structure. The solid model composition is used to select points (image method) or the spiral equation is calculated (formula method). Figure 3 The position conversion shown is used to determine the sample column position point and the sample column execution section size, which is designed to be D. The cylindrical surface of the sample column at each position point fits with the spiral surface on the same side of the spiral structure at the position where the corresponding spiral point and the spiral surface meet. It should be understood that the line connecting the centers of each sample column position point for detecting the spiral section distance is parallel to the workpiece axis and the line connecting the centers of the spiral section distance points. The plane formed by the sample column center axis and the spiral point center is on the normal section, that is, for example, the section taken along line CC, and the section is at a certain angle to the radial section of the model.

[0068] Step S2, helical section distance point size conversion: convert the axial distance dimensions X1, X3 and radial distance dimension Y1 of the helical section distance point and the model end face into Figure 3A The center coordinates of the sample column position points shown are X4, X6 and Y2;

[0069] Step S3, helical corner point size conversion: the axial distance between the corner point and the model end face is X2, and the helical corner point size is converted to 3A and Figure 3B The coordinate dimensions X5, Y3, and Y4 of the center of the sample column position point including the angle α are shown;

[0070] Step S4, conversion of starting point dimension tolerance: by using the image method or formula method, the dimension tolerance of the spiral point is converted into the dimension D of the execution section of the general column. T And the size of the sample column execution section D Z It should be understood that D T is less than D Z of.

[0071] Afterwards, the structure of the detection device can be designed based on the converted point coordinate dimensions and workpiece structure dimensions.

[0072] Combined with reference Figure 4 The base 1 may be a rectangular parallelepiped structure, and may be provided with a plurality of threaded holes and pin holes for fixing other components.

[0073] Combined with reference Figure 5The spindle 2 is designed as a movable structure according to the characteristics of the workpiece model. The workpiece is fixed to the main device through the spindle to limit its rotation and Z-direction freedom, so that the workpiece can maintain the correct position in the X direction, that is, the axial direction. For ease of use, Figure 5A and Figure 5B As shown, the spindle 2 can be composed of a working part 201 and a handle part 202 connected by threads. The working part 201 is mainly composed of a small cylinder with two ends positioned with the main device and a large cylindrical surface at two ends positioned with the workpiece, and a threaded part connected with the handle part. In order to facilitate positioning with the workpiece, the middle is disconnected by a groove. The handle part 202 is a cylinder with chamfered edges on both sides, knurled on the cylindrical surface, and a threaded blind hole structure connected to the working part on the right end surface. In view of the high precision of the spindle working part, in order to prevent the deformation of the spindle due to long-term storage affecting the positioning accuracy, there is a through hole structure on the left side of the chamfered surface, which is used for vertical hanging storage of the spindle in the warehouse. Since the spindle and the main measuring tool are a movable separation structure, the pin edge plane is mainly used for engraving marks for easy identification.

[0074] The clamping assembly includes an axial clamping assembly for clamping the workpiece in the axial direction and a radial clamping assembly for clamping the workpiece in the radial direction. The axial clamping assembly includes two positioning plates 3 and a first clamping screw 4. The positioning plates 3 are fixed to the base 1 and are used to support the two ends of the spindle 2 respectively. The first clamping screw 4 passes through one of the positioning plates 3 to axially clamp the workpiece 100 to be measured on the other positioning plate 3.

[0075] Combined with reference Figure 6 The positioning plate 3 may be in the shape of a long strip, and has a groove 301 in the middle for receiving the mandrel 2. G8 carbide sheets may be glued to the two sides of the groove by pouring water to enhance wear resistance. The bosses at both ends of the groove are the end surface positioning surfaces of the workpiece, and are provided with countersunk holes 302 for connecting the positioning plate 3 to the base 1. A taper pin hole may also be provided to fix the center of the middle groove and accurately position it on the X axis. In addition, the positioning plate 3 may have two vertically extending protrusions 303 in the middle, and a groove 301 is formed between the two protrusions.

[0076] The radial clamping assembly includes two columns 5, a pressure plate 6 and a second tightening screw 7. The pressure plate 6 is connected to the base 1 through the columns 5. The second tightening screw 7 passes through the pressure plate 6 to radially tighten the workpiece 100 to the base 1. In particular, the two columns 5 are respectively located on both sides of the spindle 2, and the pressure plate 5 is positioned at the top of the columns.

[0077] Combined with reference Figure 7 and Figure 8To facilitate the connection between the column and the pressure plate, the column 5 can be composed of four sections of cylindrical surfaces, with the bottom end being a threaded end for fixed connection with the base 1; the upper end surface supports the pressure plate, and a threaded hole and a slot are drilled on the surface for connecting the positioning screws and screwing the column into the base. The pressure plate 6 can be a strip structure, consisting of an arc groove with opposite openings at both ends and a threaded hole in the middle, which is screwed with the threaded hole and the second tightening screw 7 to clamp the workpiece.

[0078] As mentioned above, the measuring assembly includes a through sample column and a stop sample column, and also includes an angle measuring seat 9 and a number of distance measuring seats 10 corresponding to the number of thread heads of the workpiece 100 to be measured. The distance measuring seat 10 and the angle measuring seat 9 are mounted to the base 1 on the same side of the spindle 2. For a double-start thread structure, the angle measuring seat 9 is located in the middle of the two distance measuring seats 10. Each measuring seat is provided with a detection hole along the radial direction of the spindle 2, and the centers of the two or more holes on each distance measuring seat 10 are located on a straight line parallel to the axis of the spindle 2. In other words, if the workpiece to be measured is a single-start thread structure, there is only one distance measuring seat. If the workpiece to be measured is a double-start or more-start thread structure, the centers of the detection holes on the two or more distance measuring seats are located on a straight line parallel to the axis of the spindle 2.

[0079] Combined with reference Fig. 9 According to the workpiece model, the sample column size D and the point size X5, Y3, Y4, α, the angle measuring seat 9 is designed to be an L-shaped structure and includes two plate-shaped legs, one of which is used to connect the angle measuring seat 9 to the base 1 and can be connected by a slotted screw 13 and a taper pin 14. The other leg is provided with a detection hole at an angle α to the Y direction, which is used to pass the sample column to support the sample column to measure the workpiece helical angle α. There are 2 countersunk holes and 2 tapered holes on the bottom surface for fixing and accurate positioning, so that the hole position is accurately located on the point size.

[0080] Combined with reference Fig.10 According to the workpiece model, the sample column size D and the point size X4, X6, Y2, the distance measuring seat 10 is designed to be an L-shaped structure and includes two legs, one of which is used to connect the angle measuring seat 9 to the base 1, and the other leg is provided with a detection hole for supporting the sample column. There are 2 countersunk holes and 2 tapered holes on the bottom surface for fixing and accurate positioning, so that the hole position is accurately located on the point size.

[0081] The sample column and the sample stop column are used to pass through the detection holes on the distance measuring seat 10 and the angle measuring seat 9 respectively to detect whether the starting size of the workpiece 100 is qualified. T , End execution segment size D ZTo design the sample column. The execution and manufacturing tolerance, wear size, etc. of the sample column can refer to the design of the smooth gauge or use 1 / 10 of the converted tolerance value as the manufacturing tolerance. Specifically, the through sample column and the stop sample column are used to pass through the detection holes on the distance measuring seat 10 respectively. If the through sample column can contact the spiral surface at the cross section of the spiral starting point of the measured workpiece, and the stop sample column cannot contact the spiral surface at the cross section of the spiral starting point, then the spiral cross-sectional distance of the measured workpiece 100 is judged to be qualified, otherwise the spiral cross-sectional distance of the measured workpiece 100 is judged to be unqualified; the through sample column and the stop sample column are used to pass through the detection holes on the angle measuring seat 9 respectively. If the through sample column can contact the spiral surface at the cross section of the spiral starting point of the measured workpiece, and the stop sample column cannot contact the spiral surface at the cross section of the spiral starting point, then the spiral angle of the starting point of the measured workpiece 100 is judged to be qualified, otherwise the spiral angle of the starting point of the measured workpiece 100 is judged to be unqualified.

[0082] like Fig.11 As shown, the structure of the sample column and the sample stop column is similar to this, consisting of three sections of cylindrical surfaces, the frontmost cylinder is the execution section, that is, the end in contact with the workpiece to be measured, the middle is the reference section, and the rear cylinder is the handheld portion. The sample column and the sample stop column can be realized by the same sample column. In this case, the sizes of the two ends of the sample column are different, one end is used as the sample column, and the other end is used as the sample stop column. Alternatively, the two can be realized by two sample columns. In this case, the two can be designed to have only different sizes at one end in contact with the workpiece to be measured, and the structures of the other parts are completed the same. However, since the size difference between the contact ends of the sample column and the sample stop column is relatively small, in order to facilitate the distinction between the two, the mechanisms of the other parts can be designed to be relatively different, so as to facilitate the identification of the two sample columns and improve the detection efficiency.

[0083] Combined with reference Fig.12 In a preferred embodiment of the present invention, the radial clamping assembly may further include a pad 11, which is a rectangular block. The pad 11 is fixed to the base 1 between the two positioning plates 3, extends parallel to the spindle 2, and is fixed by four countersunk holes. The second tightening screw 7 passes through the pressure plate 6 to radially tighten the workpiece 100 to the pad 11.

[0084] Return to reference Figures 1 to 1C Optionally, the measuring assembly in the present invention may be provided with two groups, symmetrically arranged on both sides of the mandrel 2, for measuring left-handed threads and right-handed threads respectively. The L side of the mark indicates detection of left-handed spirals, and the R side of the mark indicates detection of right-handed threads.

[0085] Combination Fig.13According to the present invention, in order to facilitate the maintenance of the device, the measuring assembly may further include sleeves 12 corresponding to the number of distance measuring seats 10 and angle measuring seats 9, and the sleeves 12 are inserted into the detection holes on the distance measuring seats 10 and angle measuring seats 9 one by one, and are used to pass through the sample column 8. The sleeve 12 may be composed of two sections of cylindrical surfaces, with an overtravel groove at the step; there is a through hole in the middle, which is a reference hole for measuring the sample column (with a diameter greater than D), and its center position is determined by the point size, and a margin may be left during processing, and fine processing is performed after assembly to ensure the point size.

[0086] Next, the detection method provided by the present invention for detecting the starting point size of the spiral structure with a fixed starting point using the above detection device is described.

[0087] As an exemplary embodiment of the present invention, a method for detecting the starting point size of a fixed starting point spiral structure comprises the following steps:

[0088] Step S1, coaxially inserting the workpiece 100 to be measured into the mandrel 2;

[0089] Step S2, placing the spindle 2 with the workpiece 100 to be measured on two positioning plates 3, with the surface of the workpiece opposite to the base 1 in contact with the base 1;

[0090] Step S3, screwing the first tightening screw 4 on one of the positioning plates 3 to axially tighten the workpiece 100 to make the workpiece contact with the other positioning plate 3 seamlessly, and using a feeler gauge for detection;

[0091] Step S4, install the pressing plate 6 on the column 5, screw the second tightening screw 7, radially tighten the workpiece 100 to make the workpiece contact with the base 1 or the backing plate 11 seamlessly, and use a feeler gauge for detection;

[0092] Step S5, insert the through-sample column and the stop-sample column into the detection holes on the distance measuring seat 10 and the angle measuring seat 9 respectively; if the through-sample column can contact the spiral surface at the cross section of the spiral starting point of the measured workpiece 100, and the stop-sample column cannot contact the spiral surface at the cross section of the spiral starting point, then the spiral cross-sectional distance of the measured workpiece 100 is judged to be qualified, otherwise the spiral cross-sectional distance of the measured workpiece 100 is judged to be unqualified; if the through-sample column can contact the spiral surface at the cross section of the spiral starting point of the measured workpiece 100, and the stop-sample column cannot contact the spiral surface at the cross section of the spiral starting point, then the spiral angle of the starting point of the measured workpiece 100 is judged to be qualified, otherwise the spiral angle of the starting point of the measured workpiece 100 is judged to be unqualified.

[0093] Therefore, as described above, the device and method for detecting the starting point size of a spiral structure with a fixed starting point of the present invention are as follows: the workpiece to be measured passes through the mandrel, the mandrel is installed on the base, the workpiece is axially and radially tightened, the through sample column and the stop sample column can pass through the distance measuring seat fixed to the base on one side of the workpiece to detect whether the cross-sectional distance of the spiral line of the spiral structure of the workpiece is qualified, and can also pass through the angle measuring seat fixed to the base to detect whether the spiral angle of the spiral structure is qualified. Therefore, the present invention avoids the use of a spiral gauge to be screwed with the spiral structure, and can accurately measure whether the starting point size of the spiral structure with a fixed starting point is qualified. At the same time, during the detection process, after the workpiece is clamped, only the through sample column and the stop sample column need to be operated to complete the detection, and the detection efficiency is high.

[0094] Finally, it should be noted that the features mentioned and / or shown in the above description of the exemplary embodiments of the present invention may be combined in the same or similar manner into one or more other embodiments, combined with the features in other embodiments or substituted for the corresponding features in other implementations. The technical solutions obtained by these combinations or substitutions shall also be deemed to be included in the protection scope of the present invention.

Claims

1. A device for detecting the starting point size of a fixed starting point spiral structure, characterized in that: Includes a base, a spindle, a clamping assembly and a measuring assembly; The base is used to support the spindle, the clamping assembly, the measuring assembly and the workpiece to be measured; The spindle is used to coaxially pass through the workpiece to be measured so as to fix the workpiece to be measured; The clamping assembly is used to clamp the workpiece to be measured on the base, and includes an axial clamping assembly and a radial clamping assembly; The axial clamping assembly includes two positioning plates and a first tightening screw, wherein the positioning plates are fixed to the base and are used to support the two ends of the spindle respectively, and the first tightening screw passes through one of the positioning plates to axially tighten the workpiece to be measured on the other positioning plate; The radial clamping assembly includes two columns, a pressure plate and a second tightening screw, wherein the pressure plate is connected to the base through the columns, and the second tightening screw passes through the pressure plate to radially tighten the workpiece to be measured to the base; The measuring assembly comprises a sample-passing column, a sample-stopping column, an angle measuring seat and a plurality of distance measuring seats corresponding to the number of thread heads of the workpiece to be measured; The distance measuring seat and the angle measuring seat are mounted to the base on the same side of the spindle, and are respectively used to detect whether the spiral cross-sectional distance and the spiral angle at the starting point of the spiral structure of the measured workpiece are qualified, and each is provided with a detection hole along the radial direction of the spindle, and the center of the two or more holes on each distance measuring seat is located on a straight line parallel to the axis of the spindle; The sample-passing column and the sample-stopping column are used to pass through the detection holes on the distance measuring seat and the angle measuring seat respectively, so as to detect whether the starting point size of the spiral structure of the measured workpiece is qualified.

2. The device for detecting the starting point size of a fixed-starting point spiral structure according to claim 1, characterized in that: The radial clamping assembly further includes a backing plate, which is fixedly connected to the base between the two positioning plates, and the second tightening screw passes through the pressure plate to radially tighten the workpiece to be measured to the backing plate.

3. The device for detecting the starting point size of a fixed-starting point spiral structure according to claim 1 or 2, characterized in that: The measuring components are provided with two groups, which are symmetrically arranged on both sides of the spindle and are used for measuring left-handed threads and right-handed threads respectively.

4. The device for detecting the starting point size of a fixed-starting point spiral structure according to claim 1 or 2, characterized in that: The dimensions of the ends of the sample-passing column and the sample-stopping column that are in contact with the workpiece to be measured are obtained according to the following process: Step 1, converting the point of the starting size of the spiral structure into the sample column position point: constructing a model of the workpiece to be measured, selecting a point on each spiral line of the spiral structure parallel to the axis of the model as the spiral cross-section distance point, selecting a point on one of the spirals as the spiral angle point, and the circumferential surface of the spiral point is connected with the spiral surfaces on both sides of the spiral structure, completing the position conversion by sampling points or calculating the spiral equation through the solid model composition, determining the sample column position point and the sample column execution section size, and the cylindrical surface of the sample column at each position point is fitted with the spiral surface on the same side of the spiral structure at the position where the corresponding spiral point is connected with the spiral surface; Step 2, conversion of the distance between the spiral section and the point: converting the distance between the section and the point into the coordinate size of the center of the sample column position point; Step 3, helical angle point size conversion: convert the helical angle point size into the coordinate size of the sample column position point center; Step 4, conversion of starting point dimension tolerance: convert the spiral point dimension tolerance into the execution segment dimension of the general sample column and the execution segment dimension of the stop sample column through the image method or formula method.

5. The device for detecting the starting point size of a fixed-starting point spiral structure according to claim 1 or 2, characterized in that: The through sample column and the stop sample column are realized by the same sample column, or by two sample columns.

6. The device for detecting the starting point size of a fixed-starting point spiral structure according to claim 1 or 2, characterized in that: The positioning plate is in the shape of an elongated strip and has a groove in the middle for receiving the spindle, and through holes are provided at both ends for connecting the positioning plate to the base.

7. The device for detecting the starting point size of a fixed-starting point spiral structure according to claim 6, characterized in that: The positioning plate has two vertically extending protrusions in the middle, and the groove is formed between the two protrusions.

8. The device for detecting the starting point size of a fixed-starting point spiral structure according to claim 1 or 2, characterized in that: The measuring assembly also includes sleeves corresponding to the number of the distance measuring seats and the angle measuring seats, and the sleeves are inserted into the detection holes on the distance measuring seats and the angle measuring seats one by one to pass through the sample passing column and the sample stopping column.

9. The device for detecting the starting point size of a fixed-starting point spiral structure according to claim 1 or 2, characterized in that: The distance measuring seat and the angle measuring seat are both L-shaped structures and include two legs, one of which is used to connect the distance measuring seat or the angle measuring seat to the base, and the other leg is used to pass through the sample-passing column and the sample-stopping column.

10. A method for detecting the starting point size of a fixed starting point spiral structure, characterized in that: Using the detection device described in any one of claims 1 to 9 to detect the starting point size of the fixed-starting point spiral structure comprises the following steps: Step 1, coaxially inserting the workpiece to be measured into the mandrel; Step 2, placing the spindle with the workpiece to be measured on the two positioning plates, and the surface of the workpiece opposite to the base is in contact with the base; Step 3, tighten the first tightening screw on one of the positioning plates to axially tighten the workpiece to be tested, so that the workpiece is in seamless contact with the other positioning plate, and use a feeler gauge for testing; Step 4, installing the pressing plate on the column, screwing the second tightening screw, radially tightening the workpiece to be tested, making the workpiece contact seamlessly with the base, and using a feeler gauge for testing; Step 5, respectively inserting the through-sample column and the stop-sample column into the detection holes on the distance measuring seat and the angle measuring seat; if the through-sample column can contact the spiral surface at the cross section of the spiral starting point of the measured workpiece, and the stop-sample column cannot contact the spiral surface at the cross section of the spiral starting point, then the spiral cross-sectional distance of the measured workpiece is judged to be qualified, otherwise the spiral cross-sectional distance of the measured workpiece is judged to be unqualified; if the through-sample column can contact the spiral surface at the cross section of the spiral starting point of the measured workpiece, and the stop-sample column cannot contact the spiral surface at the cross section of the spiral starting point, then the spiral angle of the starting point of the measured workpiece is judged to be qualified, otherwise the spiral angle of the starting point of the measured workpiece is judged to be unqualified.

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