A device and method for detecting the size of the start point of a spiral structure

Abstract

The application provides a device and method for detecting the starting point size of a fixed starting point helical structure. The device comprises a base, a mandrel, a clamping assembly and a measuring assembly. The mandrel passes through the workpiece to be detected. In the clamping assembly, the axial clamping assembly comprises two positioning plates and a first tightening screw. The positioning plates are fixed to the base and support the two ends of the mandrel. The first tightening screw passes through one of the positioning plates and axially tightens the workpiece against the other positioning plate. The radial clamping assembly comprises two columns, a pressing plate and a second tightening screw. The pressing plate is connected to the base through the columns. The second tightening screw passes through the pressing plate and radially tightens the workpiece to the base. In the measuring assembly, the pass and stop sample column, the distance measuring seat corresponding to the number of threads of the workpiece and the angle measuring seat can detect whether the thread section distance and the thread included angle of the helical structure are qualified. The application avoids the use of helical gauges and helical structure rotation, and can accurately measure whether the starting point size of the fixed starting point helical structure is qualified, with high detection efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of spiral structure detection, and particularly relates to a detection device for detecting the start point size of a spiral structure with a fixed start point and a detection method for detecting the start point size of the spiral structure with a fixed start point by using the detection device. BACKGROUND

[0002] There are countless threads with the same properties on the cylindrical surface, and only one thread meets the start point requirement. This thread can be controlled by the start point position size, such as the cross-section distance and the radial cross-section rotation angle. Therefore, the start point size of the spiral structure with a fixed start point needs to be detected. Only when the start point size meets the requirement, the thread of the spiral structure can be qualified.

[0003] At present, the spiral gauge is usually used to detect the start point size of the spiral structure with a fixed start point. However, when the axial length of the spiral structure is much smaller than one pitch, the spiral gauge is not fully screwed, which makes it difficult to accurately measure the start point size. In addition, the detection process completely depends on manual operation when the spiral gauge is used for detection, which is inconvenient and low in detection efficiency. SUMMARY

[0004] The present application aims to solve the problems of inaccurate start point position measurement and low detection efficiency caused by using the spiral gauge to detect the start point size of the spiral structure with a fixed start point. A detection device for detecting the start point size of the spiral structure with a fixed start point and a detection method for detecting the start point size of the spiral structure with a fixed start point by using the detection device are provided. The start point size of the spiral structure is measured by using the auxiliary through and stop sample column through the point of the main device and the positioning of the heart shaft and the main gauge.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the present application is as follows:

[0006] On one hand, a detection device for detecting the start point size of the spiral structure with a fixed start point is provided, which comprises a base, a heart shaft, a clamping assembly and a measuring assembly.

[0007] The base is used to support the heart shaft, the clamping assembly, the measuring assembly and the measured workpiece.

[0008] The heart shaft is used to pass through the measured workpiece coaxially to fix the measured workpiece.

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

[0010] The axial clamping assembly comprises 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 heart shaft respectively. The first tightening screw passes through one of the positioning plates to axially tighten the measured workpiece on the other positioning plate.

[0011] The radial clamping assembly comprises two uprights, a pressing plate connected to the base through the uprights, and a second tightening screw for radially clamping the workpiece to the base through the pressing plate;

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

[0013] The distance measuring seat and the angle measuring seat are installed on the same side of the spindle to the base, and are respectively used for detecting whether the helix section distance and the helix angle of the starting point of the helical structure of the workpiece are qualified, and each is provided with a detection hole along the radial direction of the spindle, and the centers of the two or more holes on each distance measuring seat are 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 respectively pass through the detection holes on the distance measuring seat and the angle measuring seat to detect whether the starting point size of the helical structure of the workpiece is qualified.

[0015] Further, the radial clamping assembly further comprises a backing plate fixed to the base between the two positioning plates, and the second tightening screw radially clamps the workpiece to the backing plate through the pressing plate.

[0016] Further, the measuring assembly is provided with two groups, which are symmetrically arranged on both sides of the spindle and are respectively used for measuring left-handed threads and right-handed threads.

[0017] Further, the size of the end of the through sample column and the stop sample column in contact with the workpiece is obtained according to the following process:

[0018] Step 1: converting the point position of the starting point size of the helical structure into the position point of the sample column: constructing a model of the workpiece, selecting one point position on each helix of the helical structure as a helix section distance point position, and selecting one point position on one of the helixes as a helix angle point position, and the circumferential surface of the helix point position is connected with the helical surface on both sides of the helical structure, the position conversion is completed by the point sampling of the solid model drawing or the calculation of the helix equation, the sample column position point is determined, the sample column execution segment size is determined, and the cylindrical surface of the sample column at each position point is fitted with the same side helical surface of the helical structure at the position where the corresponding helix point position and the helical surface are connected;

[0019] Step 2: converting the size of the helix section distance point position: converting the size of the section distance point position into the coordinate size of the center of the sample column position point;

[0020] Step 3: converting the size of the helix angle point position: converting the size of the helix angle point position into the coordinate size of the center of the sample column position point;

[0021] Step 4: converting the starting point size tolerance: converting the size tolerance of the helix point position into the size of the through sample column execution segment and the size of the stop sample column execution segment by image method or formula method.

[0022] Further, the through sample column and the stop sample column are realized by the same sample column or by two sample columns.

[0023] Further, the positioning plate is long strip-shaped, has a groove for receiving the mandrel in the middle part, and has through holes at two ends for connecting the positioning plate to the base.

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

[0025] Further, the measuring assembly further comprises sleeves corresponding to the number of the distance measuring seats and the angle measuring seats, the sleeves are inserted into the detection holes on the distance measuring seats and the angle measuring seats one by one, and are used for passing through the through sample column and the stop sample column.

[0026] Further, the distance measuring seat and the angle measuring seat are both L-shaped structures and comprise two legs, one of which is used for connecting the distance measuring seat or the angle measuring seat to the base, and the other of which is used for passing through the through sample column and the stop sample column.

[0027] The other aspect provides a detection method for the starting point size of a starting point spiral structure, which uses the detection device to detect the starting point size of the starting point spiral structure, and comprises the following steps:

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

[0029] Step 2, placing the mandrel 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;

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

[0031] Step 4, installing the pressing plate on the column, screwing the second tightening screw to radially tighten the workpiece to be measured, so that the workpiece is in seamless contact with the base, and a feeler gauge is used for detection;

[0032] 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 spiral starting point cross section of the workpiece to be measured, and the stop sample column cannot contact the spiral surface at the spiral starting point cross section, then it is determined that the spiral cross section distance of the workpiece to be measured is qualified, otherwise it is determined that the spiral cross section distance of the workpiece to be measured is unqualified; if the through sample column can contact the spiral surface at the spiral starting point cross section of the workpiece to be measured, and the stop sample column cannot contact the spiral surface at the spiral starting point cross section, then it is determined that the spiral included angle of the starting point of the workpiece to be measured is qualified, otherwise it is determined that the spiral included angle of the starting point of the workpiece to be measured is unqualified.

[0033] The advantages of the present application are:

[0034] The detection device and detection method of the starting point size of the fixed starting point helical structure of the present application pass the workpiece to be detected through the mandrel, the mandrel is installed on the base, the workpiece is axially and radially clamped, the sample column and the stop sample column can pass through the distance measuring seat fixed to the base on one side of the workpiece, the detection of whether the helical structure spiral section distance is qualified can be carried out, and the detection of whether the helical structure spiral included angle is qualified can also be carried out. Therefore, the present application avoids the use of helical gauge and helical structure rotation, and can accurately measure whether the starting point size of the fixed starting point helical structure is qualified. At the same time, during the detection process, after the clamping of the workpiece is completed, the detection can be completed by operating the sample column and the stop sample column, and the detection efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0035] The above and / or other features and advantages of the present application will become more apparent by describing in following the present application with reference to the accompanying drawings, which are not drawn to scale, and some features are enlarged or reduced to show the details of specific components, in which:

[0036] Figure 1 is a schematic view of the detection device of the starting point size of the fixed starting point helical structure of the present application;

[0037] Figure 1A is a front view of Figure 1 ;

[0038] Figure 1B is a top view of Figure 1 ;

[0039] Figure 1C is a right view of Figure 1 ;

[0040] Figure 2 is a schematic view of the fixed starting point helical structure detected by the present application;

[0041] Figure 2A is a front view of Figure 2 ;

[0042] Figure 2B is an axial sectional view taken along line A-A of Figure 2A ;

[0043] Figure 2C is a normal sectional view taken along line C-C of Figure 2A ;

[0044] Figure 3 is a schematic view of the sample column detection position in the present application;

[0045] Figure 3A is a front view of Figure 3 ;

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

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

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

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

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

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

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

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

[0054] Figure 9 This is a schematic diagram of the angle measuring seat in this invention;

[0055] Figure 10 This is a schematic diagram of the distance measuring base in this invention;

[0056] Figure 11 This is a schematic diagram of the sample column in this invention;

[0057] Figure 12 This is a schematic diagram of the pad in this invention;

[0058] Figure 13 This is a schematic diagram of the sleeve in this invention.

[0059] In the diagram: 1-base; 2-mandrel, 201-working part, 202-handle part; 3-positioning plate, 301-groove, 302-countersunk hole, 303-protrusion; 4-first tightening screw; 5-column; 6-pressure plate; 7-second tightening screw; 8-sample column; 9-angle measuring seat; 10-distance measuring seat; 11-pad; 12-sleeve; 13-slotted screw; 14-tapered pin; 100-workpiece to be measured. Detailed Implementation

[0060] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments thereof. It should be noted that the following detailed description of the present invention is for illustrative purposes only and is not intended to limit the scope of the invention.

[0061] It should be noted that, in the context of the present application, the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise" and "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0062] In addition, terms such as "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can be explicitly or implicitly included one or more of the features.

[0063] The present application provides a detection device for detecting the start point size of a fixed start point spiral structure and a detection method for detecting the start point size of a fixed start point spiral structure using the detection device, which is used to position the main gauge by the mandrel clamping, and to detect the start point size of the fixed start point spiral structure quickly and accurately by the point position of the main device through the auxiliary through and stop sample column.

[0064] First, the detection device for detecting the start point size of the fixed start point spiral structure provided by the present application is described.

[0065] Reference Figures 1-1C The detection device for detecting the start point size of the fixed start point spiral structure as an exemplary embodiment of the present application comprises a base 1, a mandrel 2, a clamping assembly and a measuring assembly. The base 1 is used to support the mandrel 2, the clamping assembly, the measuring assembly and the measured workpiece 100. The mandrel 2 is used to coaxially pass through the measured workpiece 100 to fix the measured workpiece 100. The clamping assembly is used to clamp the measured workpiece 100 on the base 1. The measuring assembly is used to detect the start point size of the spiral structure of the measured workpiece 100 through the sample column 8, i.e. 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 start point of the measured workpiece spiral structure is qualified, the distance measuring seat is used to detect whether the spiral cross section distance of the start point of the measured workpiece spiral structure is qualified, and the number corresponds to the number of threads of the measured workpiece 100. In the detection, if the through sample column contacts the spiral surface at the cross section of the start point of the measured workpiece spiral after passing through each measuring seat, and the stop sample column cannot contact the spiral surface at the cross section of the start point of the measured workpiece spiral after passing through each measuring seat, it can be determined that the start point size of the spiral structure of the measured workpiece 100 is qualified.

[0066] The present application exemplarily takes the spiral structure of the measured workpiece 100 as a double-headed rectangular spiral structure as an example to illustrate the design concept process of the detection device, and similar steps can be used for other spiral structures:

[0067] Step S1, converting the start point size of the helical structure into the sample column position point: as shown in Figures 2-2C , a model of the workpiece to be measured is constructed, which can be constructed using CAD software, and a point position is selected on each helix of the helical structure as a helix cross-section distance point position parallel to the axis of the model, and a point position is selected on one of the helixes as a helix angle point position, and the circumferential surface of the helix point position is connected to the two helical surfaces of the helical structure, and the position conversion shown in Figure 3 is completed by solid model mapping point (image method) or helix equation calculation (formula method), to determine the sample column position point and determine the sample column execution section size, which is designed as D, and the cylindrical surface of the sample column at each position point is fitted to the same side helical surface of the helical structure at the position where the corresponding helix point position and the helical surface are connected, it should be understood that the connecting line of the centers of each sample column position point for detecting the helix cross-section distance is parallel to the workpiece axis, and at the same time parallel to the connecting line of the centers of the helix cross-section distance point positions, and the plane formed by the center axis of the sample column and the center of the helix point position is in the normal section, i.e. the section taken along line C-C, which is at an angle to the radial section of the model;

[0068] Step S2, helix cross-section distance point position size conversion: the axial distance size X1, X3 and the radial distance size Y1 of the helix cross-section distance point position and the end face of the model are converted into Figure 3A the center coordinate size X4, X6 and Y2 of the sample column position point as shown in

[0069] Step S3, helix angle point position size conversion: the axial distance size X2 of the angle point position and the end face of the model is converted into the coordinate size X5, Y3, Y4 of the center of the sample column position point containing the angle α as shown in 3A and Figure 3B

[0070] Step S4, start point size tolerance conversion: the helix point position size tolerance is converted into the sample column execution section size D T and the stop sample column execution section size D Z by image method or formula method. It should be understood that D T is smaller than D Z .

[0071] Thereafter, according to the converted point position coordinate size and the workpiece structure size, the structure of the detection device can be designed.

[0072] For reference Figure 4 , the base 1 can be in the form of a rectangular parallelepiped structure, and a plurality of threaded holes and pin holes for fixing other components are formed on it.

[0073] For reference Figure 5 ​, the mandrel 2 is designed as a movable structure according to the workpiece model features, the workpiece is fixed on the main device through the mandrel, the rotation and Z-direction freedom are limited, and the workpiece is kept in the correct position in the X-direction, i.e. the axial direction. For the convenience of use, as shown in Figure 5A and Figure 5B , the mandrel 2 can be composed of a working part 201 and a handle part 202 through threaded connection. The working part 201 is mainly composed of a small cylinder at both ends positioned with the main device, two large cylindrical surfaces at both ends positioned with the workpiece, and a threaded part connected with the handle part. For the convenience of positioning with the workpiece, the middle part is disconnected by a groove. The handle part 202 is a cylindrical part with two chamfered edges, the cylindrical surface is knurled, and the right end surface has a threaded blind hole structure connected with the working part. In view of the high precision of the mandrel working part, the deformation of the mandrel during long-term storage is prevented to affect the positioning accuracy. There is a through hole structure on the left side of the chamfered surface for vertical suspension storage of the mandrel in the warehouse. Since the mandrel and the main device are movable and separated structures, the pin edge plane is mainly used for marking, which is convenient for 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 tightening screw 4, the positioning plates 3 are fixed to the base 1 for supporting both ends of the mandrel 2 respectively, and the first tightening screw 4 passes through one of the positioning plates 3 to axially tighten the measured workpiece 100 on the other positioning plate 3.

[0075] In combination with reference to Figure 6 , the positioning plate 3 can be in the shape of a long strip and has a groove 301 in the middle part for receiving the mandrel 2. The two sides in the groove can be bonded with G8 hard alloy pieces by pouring water to enhance wear resistance; the two end bosses outside the groove are workpiece end face positioning surfaces, are provided with a counterbore 302 for connecting the positioning plate 3 to the base 1, and can also be provided with a taper pin hole to fix and accurately position the center of the middle groove on the X-axis. In addition, the positioning plate 3 can have two vertically extending protrusions 303 in the middle part, and the groove 301 is formed between the two protrusions.

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

[0077] In combination with reference to Figure 7 and Figure 8For the convenience of realizing the column and the pressing plate and the connection, the column 5 can be composed of four segments of cylindrical surface, the bottom end is a threaded end, used for being fixedly connected with the base 1; the upper end surface supports the pressing plate, the surface is drilled with threaded holes and a slot, used for connecting the positioning screw and rotating the column into the base. The pressing plate 6 can be a strip structure, composed of two circular arc slots with opposite openings at the two ends and a threaded hole in the middle, and is rotated with the second tightening screw 7 through the threaded hole, so as to press the workpiece.

[0078] As mentioned above, the measuring assembly includes the through sample column and the stop sample column, and further includes an angle measuring seat 9 and a plurality of distance measuring seats 10 corresponding to the number of thread heads of the measured workpiece 100. The distance measuring seats 10 and the angle measuring seat 9 are installed to the base 1 on the same side of the mandrel 2, and for the double-thread structure, the angle measuring seat 9 is located in the middle of the two distance measuring seats 10. Each measuring seat is respectively provided with a detection hole along the radial direction of the mandrel 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 mandrel 2. In other words, if the measured workpiece is a single-thread structure, there is only one distance measuring seat. If the measured workpiece is a double-thread or more-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 mandrel 2.

[0079] With reference to Figure 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 as an L-shaped structure and includes two legs respectively in the form of plates, one of which is used to connect the angle measuring seat 9 to the base 1, which can be connected through a slot screw 13 and a taper pin 14, and the other of which is provided with a detection hole at an angle α with the Y direction, used for passing through the sample column to support the sample column to measure the thread angle α of the workpiece. The bottom surface has two counterbores and two taper holes, used for fixed connection and accurate positioning, so that the hole position is accurately positioned on the point size.

[0080] With reference to Figure 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 as 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 of which is provided with a detection hole, used for supporting the sample column. The bottom surface has two counterbores and two taper holes, used for fixed connection and accurate positioning, so that the hole position is accurately positioned on the point size.

[0081] The through sample column and the stop sample column are used to respectively pass through the detection holes on the distance measuring seat 10 and the angle measuring seat 9, so as to detect whether the start size of the measured workpiece 100 is qualified. According to the tolerance conversion, the size D T of the through end execution segment of the sample column and the size D Z of the stop end execution segment of the sample column.The sample column is designed. The execution and manufacturing tolerance, wear size, etc. of the sample column can refer to the design of the smooth gauge or be manufactured with the manufacturing tolerance of 1 / 10 of the converted tolerance value. Specifically, the through sample column and the stop sample column are used to pass through the detection holes on the distance measuring seat 10, if the through sample column can contact the spiral surface at the spiral start section of the measured workpiece, and the stop sample column cannot contact the spiral surface at the spiral start section, it is determined that the thread section distance of the measured workpiece 100 is qualified, otherwise it is determined that the thread section distance of the measured workpiece 100 is unqualified; the through sample column and the stop sample column are used to pass through the detection holes on the angle measuring seat 9, if the through sample column can contact the spiral surface at the spiral start section of the measured workpiece, and the stop sample column cannot contact the spiral surface at the spiral start section, it is determined that the thread angle at the start point of the measured workpiece 100 is qualified, otherwise it is determined that the thread angle at the start point of the measured workpiece 100 is unqualified.

[0082] As shown in Figure 11 The structures of the through sample column and the stop sample column are similar, which are composed of three cylindrical surfaces, the frontmost cylindrical surface is the execution section, that is, the end that contacts the measured workpiece, the middle section is the reference section, and the rear cylindrical surface is the handheld part. The through sample column and the stop sample column can be realized by the same sample column, in which case the sizes of the two ends of the sample column are different, one end serves as the through sample column and the other end serves as the stop sample column. Alternatively, the two can be realized by two sample columns. In this case, the two can be designed such that only the sizes of the ends that contact the measured workpiece are different, and the structures of the other parts are the same. However, since the size difference between the contact ends of the through sample column and the stop sample column is relatively small, in order to facilitate the differentiation between the two, the structures of the other parts can be designed to be significantly different, so as to facilitate the identification of the two sample columns and improve the detection efficiency.

[0083] With reference to Figure 12 In the preferred embodiment of the present application, the radial clamping assembly can further include a pad plate 11, which is a rectangular block, and is fixed to the base 1 between the two positioning plates 3 and extends in parallel with the mandrel 2, and is installed and fixed by four counterbores, and the second tightening screw 7 passes through the pressing plate 6 to radially tighten the measured workpiece 100 to the pad plate 11.

[0084] With reference back to Figures 1-1C Optionally, the measuring assembly in the present application can be provided with two groups, which are symmetrically arranged on the two sides of the mandrel 2 and are respectively used for measuring left-handed threads and right-handed threads. The mark L side indicates the detection of left-handed threads, and the mark R side indicates the detection of right-handed threads.

[0085] With reference to Figure 13In order to facilitate the maintenance of the device, the measuring assembly can further comprise sleeves 12 corresponding to the number of distance measuring seats 10 and angle measuring seats 9, which are inserted into the detection holes on the distance measuring seats 10 and angle measuring seats 9 respectively for passing through the sample column 8. The sleeve 12 can be composed of two cylindrical sections with a step and an over-travel groove, and a through hole in the middle for measuring the sample column reference hole (with a diameter larger than D), the center position of which is determined by the point size, and a margin can be left during processing, and the point size can be ensured by finishing after assembly.

[0086] Next, the detection method for detecting the start point size of the start point helical structure using the detection device provided by the present application is described.

[0087] The detection method for detecting the start point size of the start point helical structure as an exemplary embodiment of the present application comprises the following steps:

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

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

[0090] Step S3, the first tightening screw 4 on one of the positioning plates 3 is screwed, the workpiece 100 to be measured is axially tightened, the workpiece is in seamless contact with the other positioning plate 3, and the feeler gauge is used for detection;

[0091] Step S4, the pressure plate 6 is installed on the column 5, the second tightening screw 7 is screwed, the workpiece 100 to be measured is radially tightened, the workpiece is in seamless contact with the base 1 or the backing plate 11, and the feeler gauge is used for detection;

[0092] Step S5, the through sample column and the stop sample column are respectively inserted into the detection holes on the distance measuring seat 10 and the angle measuring seat 9, if the through sample column can contact the helical surface at the helical start point section of the workpiece 100 to be measured, and the stop sample column cannot contact the helical surface at the helical start point section, it is determined that the helical section distance of the workpiece 100 to be measured is qualified, otherwise it is determined that the helical section distance of the workpiece 100 to be measured is unqualified; if the through sample column can contact the helical surface at the helical start point section of the workpiece 100 to be measured, and the stop sample column cannot contact the helical surface at the helical start point section, it is determined that the helical angle of the workpiece 100 to be measured at the start point is qualified, otherwise it is determined that the helical angle of the workpiece 100 to be measured at the start point is unqualified.

[0093] Therefore, as described above, the device and method for detecting the start point size of the start point spiral structure of the present application passes the workpiece to be detected through the mandrel, the mandrel is installed on the base, the workpiece is axially and radially clamped, the distance measuring seat fixed to the base on one side of the workpiece can be passed through the sample column and the stop sample column to detect whether the spiral structure spiral section distance of the workpiece is qualified, and the angle measuring seat fixed to the base can also be passed through to detect whether the spiral structure spiral included angle is qualified. Therefore, the present application avoids using the spiral gauge and the spiral structure rotation, and can accurately measure whether the start point size of the start point spiral structure is qualified. At the same time, during the detection process, after the clamping of the workpiece is completed, the detection can be completed by only operating the sample column and the stop sample column, and the detection efficiency is high.

[0094] Finally, it should be noted that the features mentioned and / or shown in the above description of exemplary embodiments of the application can be combined with one another in an identical or similar manner to form one or more other embodiments, in combination with or in replacement of corresponding features in other embodiments. The technical solutions obtained by combining or replacing should also be considered to be within the scope of protection of the present application.

Claims

1. A device for detecting the starting point dimension of a fixed-starting-point spiral structure, characterized in that: Includes base, spindle, clamping assembly and measuring assembly; The base is used to support the mandrel, the clamping assembly, the measuring assembly, and the workpiece being measured; The mandrel is used to pass coaxially through the workpiece being measured in order to fix the workpiece being 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 clamping screw. The positioning plates are fixed to the base and are used to support the two ends of the mandrel respectively. The first clamping screw passes through one of the positioning plates and axially clamps the workpiece to be measured onto the other positioning plate. The radial clamping assembly includes two columns, a pressure plate, and a second clamping screw. The pressure plate is connected to the base through the columns, and the second clamping screw passes through the pressure plate to radially clamp the workpiece to be measured to the base. The measuring components include a through-feed post, a stop-feed post, an angle measuring seat, and several distance measuring seats corresponding to the number of threaded heads of the workpiece being measured. The distance measuring seat and the angle measuring seat are mounted on the base on the same side of the mandrel, respectively, to detect whether the helical section distance and helical included angle of the starting point of the helical structure of the workpiece being tested are qualified, and each is provided with a detection hole along the radial direction of the mandrel, and the center of two or more holes on each distance measuring seat is located on a straight line parallel to the axis of the mandrel. The through-type column and the stop-type column are used to pass through the detection holes on the distance measuring seat and the angle measuring seat, respectively, to detect whether the starting size of the spiral structure of the workpiece under test is qualified; The dimensions of the ends of the through and stop gauges that contact the workpiece being measured are obtained according to the following process: Step 1: Convert the starting point of the spiral structure into the position point of the sample column: Construct a model of the workpiece to be measured. Select a point on each spiral line of the spiral structure parallel to the axis of the model as the spiral section distance point. Select a point on one of the spiral lines 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. Complete the position conversion by constructing the solid model and sampling points or calculating the spiral equation. Determine the position point of the sample column and the size of the sample column execution section. The cylindrical surface of the sample column at each position point is in contact with the spiral surface on the same side of the spiral structure at the position where the corresponding spiral point is connected to the spiral surface. Step 2, Conversion of the distance between the spiral section and the point: Convert the distance between the section and the point into the coordinate dimension of the center of the sample column position point; Step 3, Helical Angle Point Dimension Conversion: Convert the helical angle point dimensions into the coordinate dimensions of the center of the sample column position point; Step 4, Starting point size tolerance conversion: Convert the spiral point size tolerance into the through-sample column execution section size and the stop-sample column execution section size using image method or formula method.

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

3. The detection device for the starting point dimension of a fixed-starting-point spiral structure according to claim 2, characterized in that: The measuring components are provided in two sets, symmetrically arranged on both sides of the mandrel, and are used to measure left-hand threads and right-hand threads respectively.

4. The detection device for the starting point dimension of a fixed-starting-point spiral structure according to claim 2, characterized in that: The through sample column and the stop sample column are implemented using the same sample column, or using two sample columns.

5. The detection device for the starting point dimension of a fixed-starting-point spiral structure according to claim 2, characterized in that: The positioning plate is elongated and has a groove in the middle for receiving the mandrel, and through holes at both ends for connecting the positioning plate to the base.

6. The detection device for the starting point dimension of a fixed-starting-point spiral structure according to claim 5, characterized in that: The positioning plate has two vertically extending protrusions in the middle, and the groove is formed between the two protrusions.

7. The detection device for the starting point dimension of a fixed-starting-point spiral structure according to claim 2, characterized in that: The measuring assembly also includes sleeves corresponding to the number of distance measuring seats and angle measuring seats. Each sleeve is inserted into a detection hole on the distance measuring seat and angle measuring seat to pass through the through sample column and the stop sample column.

8. The detection device for the starting point dimension of a fixed-starting-point spiral structure according to claim 2, characterized in that: Both the distance measuring seat and the angle measuring seat are L-shaped structures and include two legs. One leg 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 through column and the stop column.

9. A method for detecting the starting point dimension of a fixed-starting-point spiral structure, characterized in that, The detection device according to any one of claims 2 to 8 is used to detect the starting point dimension of the fixed starting point spiral structure, including the following steps: Step 1: Insert the mandrel coaxially into the workpiece to be tested; Step 2: Place the mandrel with the workpiece to be tested on the two positioning plates, with the surface of the workpiece to be tested opposite to the base in contact with the pad. Step 3: Tighten the first clamping screw on one of the positioning plates to axially clamp the workpiece to be tested, so that the workpiece to be tested is in seamless contact with the other positioning plate, and use a feeler gauge for inspection. Step 4: Install the pressure plate on the column, tighten the second tightening screw to radially tighten the workpiece to be tested, so that the workpiece to be tested is in seamless contact with the pad, and use a feeler gauge for inspection; Step 5: Insert the through-feed post and the stop-feed post into the detection holes on the distance measuring seat and the angle measuring seat, respectively. If the through-feed post can contact the helical surface at the helical starting point section of the workpiece being tested, and the stop-feed post cannot contact the helical surface at the helical starting point section, then the helical section distance of the workpiece being tested is deemed qualified; otherwise, the helical section distance of the workpiece being tested is deemed unqualified. If the through-feed post can contact the helical surface at the helical starting point section of the workpiece being tested, and the stop-feed post cannot contact the helical surface at the helical starting point section, then the helical angle at the starting point of the workpiece being tested is deemed qualified; otherwise, the helical angle at the starting point of the workpiece being tested is deemed unqualified.

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