46 results about "Position tolerance" patented technology

The utility model relates to the field of powder metallurgy part detection devices, and discloses a powder metallurgy part form and location tolerance detection device. The device comprises a rotating platform, and an automatic feeding mechanism, a measuring instrument, a first pneumatic discharging mechanism and a second pneumatic discharging mechanism which are arranged on the rotating platform at intervals in the circumferential direction; the rotating platform comprises a base and a rotating disc, a plurality of driving assemblies are arranged on the rotating disc at intervals, the driving assemblies are suitable for installing measured parts and driving the measured parts to rotate so that the measuring instrument can measure the form and location tolerance of the outer diameter, and the automatic feeding mechanism is suitable for placing the measured parts on the corresponding driving assemblies; the first pneumatic discharging mechanism is suitable for blowing off unqualified products after measurement from the corresponding driving assemblies, and the second pneumatic discharging mechanism is suitable for blowing off qualified products after measurement from the corresponding driving assemblies. According to the utility model, the detection efficiency is improved; the blanking of the tested part is smooth; and the convenience of clamping, rotating, detecting and feeding of the parts is improved.

The invention discloses a multi-hole position tolerance detection device and a position tolerance detection method, the multi-hole position tolerance detection device comprises a bottom rack, a clamping module, a measuring module and a displacement mechanism, the clamping module is installed at the center of the top of the bottom rack, the bottom of the displacement mechanism is installed at two sides of the bottom rack, the measuring module is installed on the displacement mechanism, and the displacement mechanism is installed on the bottom rack. The measuring module comprises a fastening unit, a first offset unit, a second offset unit and a detection unit, the fastening unit is connected with the displacement mechanism, the fastening unit and the first offset unit are clamped in the length direction and can slide in the length direction, and the first offset unit and the second offset unit are clamped in the width direction and can slide in the width direction; the detection unit comprises a displacement detection piece and a position degree detection piece which are respectively used for detecting offset and workpiece hole positions. According to the invention, the offset of the detection unit is acquired through the first offset unit and the second offset unit by using the offset measurement module, so that the position degree error is determined, and the detection precision of the position degree error of multiple holes is improved.

The embodiment of the invention discloses a multi-sensor monitoring and compensating method for machining deformation of a large annular part. According to the embodiment of the invention, the feed-forward compensation amount can be generated on the basis of the predicted radial deformation amount of the stress abrupt change area in the surface radial deformation appearing time when the large annular part is machined, and then the feedback compensation amount is generated according to the deviation between the expected machining contour and the actual radial position data of the large annular part; and generating a total compensation amount according to the feedback compensation amount and the feed-forward compensation amount, and adjusting the motion trail of a cutter on the machine tool according to the total compensation amount, and the expected machining contour, the shape tolerance and the position tolerance of the large annular piece. Therefore, according to the embodiment of the invention, deformation caused by stress release can be compensated in real time in the machining process of the large annular part, and the compensation efficiency is improved.

The present invention discloses a proportional positioning device and method for a traction seat, which belongs to the field of fixture technology. In actual production, the positioning is accurate and does not require multiple adjustments. Positioning can be completed by clamping once. The present invention has the ability of conformal positioning. The left and right ends are fed simultaneously during the positioning process, and the feeding distance is kept at a fixed ratio. It can adapt to the deviation of the blank, and has the ability to compensate for daily wear and tear, and can provide stable and reliable positioning accuracy; while positioning, it has a clamping effect, which can weaken the deformation and vibration of the traction seat, and improve the problem of excessive tolerances in size, shape and position tolerances, and surface roughness. It fundamentally solves the problem of excessive tolerances or even scrapping of workpieces caused by inaccurate positioning, deformation, and vibration, greatly improves product quality and stability, and improves the yield rate. At the same time, it shortens the clamping time of the workpiece, greatly improves production efficiency, and improves the labor intensity of workers. The operation is simple and convenient, saving time and effort. It reduces costs and increases efficiency while improving product market competitiveness.

The utility model discloses a form and location tolerance detection jig stable in use, which belongs to the technical field of tolerance detection jigs and comprises a reference table, height adjusting assemblies are arranged on two sides of the upper end of the reference table, and a first vertical plate is connected between the height adjusting assemblies on one side of the upper end of the reference table. An adjusting disc is screwed to enable a double-end lead screw to rotate, the double-end lead screw drives a moving seat to move in the middle of a base, a rotating seat at the upper end of the moving seat pushes a push plate to rotate, the push plate pushes a first vertical plate and a second vertical plate to move through a connecting seat, the distance between a fixing column and the upper surface of a reference table and the distance between a fixing disc and the upper surface of the reference table are changed, and fixing of different sizes is facilitated; according to the utility model, the position adjusting assembly is arranged, the dial gauge is fixed on the gauge stand through a bolt, the gauge stand transversely moves on the transverse slide rail, and the moving plate longitudinally moves on the longitudinal slide rail, so that the dial gauge on the gauge stand can be adjusted at any position, the detection range is improved, and the detection precision is ensured.

The present invention discloses a transition tooling for measuring the dimensional accuracy of form and position tolerances, comprising a base, a rotating shaft installed in the base through a bearing, a pressure cap fixed on the base and an inner locking ring fixed on the rotating shaft respectively provided at the lower end of the bearing, an outer fixing ring provided at the lower end of the inner locking ring, an extension shaft connected to the upper end of the rotating shaft, a positioning plate connected to the upper end of the extension shaft, a calibration plate provided at the upper end of the positioning plate, a steel ball provided at the center position between the calibration plate and the positioning plate, the calibration plate and the positioning plate are connected by a large gasket and a long screw to adjust the flatness accuracy of the calibration plate. The base of the present invention is installed on the reference plane of the frame part in the machine assembly, the long screw on the positioning plate is adjusted, and the calibration plate is rotated in conjunction with the rotating shaft, so that the runout accuracy of the reference plane end installed on the base is completely transitioned to the calibration plate, thereby improving the repair efficiency of large-scale frame parts in mechanical assembly, product accuracy and assembly efficiency.

This invention discloses a method for correcting the form and position tolerances of a fiber-wound engine housing. A front joint positioning fixture is connected to the front joint of the housing, and a rear joint positioning fixture is connected to the rear joint of the housing. The method involves detecting the coaxiality, perpendicularity, and spacing of the front joints, and marking the high and low points where perpendicularity exceeds the tolerance. Using the high point of the rear joint as a reference, the method adjusts the low point by tightening the adjusting screws near the low point of the rear joint and the rear joint positioning fixture, pulling the low point outwards to the high point. The correction fixture fully utilizes the tensile and non-compressive characteristics of the front and rear joints to adjust the low point of the out-of-tolerance joint to the reverse limit. The adjusted housing is then subjected to low-temperature heating, which causes the epoxy resin in the composite layer to undergo permanent deformation, thereby stabilizing the housing dimensions. The perpendicularity tolerances of the front and rear joints meet the design and process requirements, achieving the correction purpose and avoiding product scrap due to excessive perpendicularity of the housing.

The application discloses a kind of in-situ measurement methods of large-size annular part shape and position tolerance, belong to detection technical field, for large-size annular optical, in-situ measurement of mechanical parts, its steps are: (1) using scale, laser interferometer, standard ball calibration numerical control machining center precision;(2) using indicating meter measurement and debugging workpiece and turntable parallel, concentric;(3) using laser tracker measurement workpiece parameter establishes workpiece coordinate system;(4) using laser tracker combines machine tool to measure part profile parameters;(5) analysis part geometric quantity shape and position error.The application method solves the in-situ measurement problem of large-size annular workpiece machining process, reduces the risk and cost that workpiece needs to be repeatedly transported and inspected, with the characteristics of convenient operation, safe and efficient, high measurement precision.

The utility model provides a quick positioning and clamping tool which comprises a first clamping disc and a second clamping disc, the second clamping disc is arranged to protrude upwards from the upper surface of the first clamping disc, the first clamping disc and the second clamping disc are coaxially arranged, the diameter of the first clamping disc is larger than that of the second clamping disc, and the diameter of the second clamping disc is larger than that of the first clamping disc. A plurality of outer mounting holes which are distributed in the circumferential direction are formed in the first clamping disc, a plurality of inner mounting holes and kidney-shaped holes which are distributed in the circumferential direction are formed in the second clamping disc, and the kidney-shaped holes extend in the diameter direction of the second clamping disc and are closer to the center of the second clamping disc relative to the inner mounting holes. By means of the positioning and clamping tool, clamping deformation of the cabin can be prevented, the precision requirements of dimensional tolerance and form and location tolerance after machining are met, the key groove is formed in the bottom of the tool to be rapidly positioned with a machine tool workbench, the clamping and aligning time is shortened, and the production efficiency is improved.

The embodiment of the application discloses a large ring part processing deformation multi-sensor monitoring compensation method; the embodiment of the application can generate a feedforward compensation amount based on the radial deformation amount of the stress mutation region in the surface radial deformation appearance time obtained by prediction when processing a large ring part, then generate a feedback compensation amount according to the deviation between the expected processing contour of the large ring part and the actual radial position data, generate a total compensation amount according to the feedback compensation amount and the feedforward compensation amount, and adjust the motion trail of the cutter on the processing machine tool according to the total compensation amount, the expected processing contour of the large ring part, the shape tolerance and the position tolerance. Thus, the embodiment of the application can compensate the deformation caused by stress release in real time during the processing of the large ring part, and improve the compensation efficiency.

According to the special detection tool for the profile tolerance and the position tolerance of the automobile auxiliary frame rear support aluminum workpiece, a plurality of tools are arranged on a base, quick clamps are arranged above the two ends of each tool respectively, T-shaped pressing heads are installed on the quick clamps, and the T-shaped pressing heads are pressed on the corners of the workpiece; side push rod seats are arranged on the two sides of the tool respectively, side push rods are inserted into horizontal through holes in the side push rod seats, and side contour blocks are installed at the ends of the side push rods. Through holes are formed in the positions, corresponding to connecting holes of connecting lugs on the two sides of the workpiece, of the base, and the connecting holes and the through hole inserting hole gauges are formed. The auxiliary frame rear support outer contour detection tool is specially used for detecting the auxiliary frame rear support outer contour and the processing hole site, and has the advantages of rapid and accurate detection, convenient operation and the like.

The utility model discloses a form and location tolerance detection device, which belongs to the technical field of form and location tolerance detection and comprises a main guide rail, two ends of the main guide rail are respectively provided with a plurality of split guide rails, the bottoms of the main guide rail and the split guide rails are respectively provided with a lower sliding groove, and an inner cavity of each lower sliding groove is provided with a supporting mechanism. The top of the main guide rail and the top of the split guide rail are each provided with an upper sliding groove, and a detection mechanism is arranged in an inner cavity of each upper sliding groove. In the utility model, other split guide rails are inserted into the end parts of the main guide rails or the split guide rails, so that the connecting blocks at the end parts of the other split guide rails are inserted into the through grooves at the end parts of the main guide rails or the split guide rails; and in addition, the elastic force of a first spring is utilized to drive a bolt to be inserted into an insertion hole in a connecting block to fix the main guide rail and the split guide rails and fix the split guide rails, so that the length of the detection device is conveniently adjusted, and the practicability of the form and location tolerance detection device is improved.

The embodiment of the application discloses a kind of shape and position tolerance detection frock and detection method, wherein the frock includes: frock base, the frock base is used to support;Main rod, the main rod is vertically connected with the base;Auxiliary rod, the auxiliary rod is vertically connected with the main rod, the relative position of the auxiliary rod with the main rod is adjustable;Dial gauge, the dial gauge is connected to the end of the auxiliary rod by clamp table piece;The clamp table piece is used to adjust the position of dial gauge.Improve detection efficiency, reduce measurement cost.

The invention provides an angular contact ball bearing assembling method which comprises the following steps: detecting and acquiring geometric parameters and form and location tolerances of inner and outer rings of each bearing so as to determine whether the bearing is qualified or not, and correspondingly storing the geometric parameters and placement positions; the stored geometric parameters of the inner and outer rings of the qualified bearings and the sizes of the target rolling bodies are selected to calculate corresponding bearing contact angles and protruding amounts, and the combined corresponding relation of the bearing outer rings, the bearing inner rings and the target rolling bodies meeting the requirements of the contact angles and the protruding amounts of the finished bearings is obtained based on the maximum fitting rate; a manipulator is controlled to grab the inner and outer rings of the bearings and the pre-assembled retainer assembly according with the combination corresponding relation to form a pre-assembled bearing assembly; the actual protruding amount of the pre-assembled bearing assembly is detected, and if the actual protruding amount is within the set protruding amount range, the sleeve of the pre-assembled bearing assembly is detached; and assembling the disassembled inner and outer rings of the bearing, the finished rolling body and the finished retainer into a whole to form a finished bearing assembly. The automatic assembly yield and the bearing assembly efficiency can be remarkably improved.

The application provides a method for machining an elongated hole in a machining center to ensure the shape and position tolerances of the elongated hole, which adopts a coarse and fine combined mode to machine the elongated hole according to the size and depth of the elongated hole. In the coarse machining, a centering drill is selected to determine the coarse reference position, so that the tool is prevented from breaking and the surface roughness in the hole is ensured to establish an accurate reference for subsequent machining; in the fine machining, different types of tools are selected to perform combined cutting according to the different effects of the tool edges participating in cutting, so that the tool is protected, the tool breaking phenomenon is not prone to occur, the service life of the tool is ensured, and the size accuracy and position accuracy of the machined hole are ensured; in the final forming machining, a drill reamer is selected to perform machining, so that the hole diameter size is ensured and the roughness in the hole is ensured.

The invention relates to the technical field of hydraulic engineering, in particular to an auxiliary tool for measuring form and location tolerance of a steel gate and an embedded part, the auxiliary tool comprises a magnetic base, a scale rod, a limiter, a suspension wire device, a positioning nut, a suspension wire hammer and a scribing device, the top of the magnetic base is provided with a threaded hole, the bottom of the scale rod is provided with a screw rod, and the screw rod is screwed into the threaded hole of the magnetic base and fixed; the limiting stopper is sleeved on the scale rod in a sliding manner, and is screwed and limited through the positioning nut; the wire suspension device is slidably sleeved on the scale rod, freely rotates by taking the scale rod as a center, and is fixed at a certain position of the scale rod through the limiter; screw holes are formed in the tops of the suspension wire device and the scale rod and used for being matched with the suspension wire fixing nut to install and fix the suspension wire; threaded holes which are the same as the threaded holes in the top of the magnetic base are formed in the top of the plumb bob and the top of the scribing device and used for screwing a screw at the bottom of the scale rod.

The invention relates to a plug connector assembly (1), in particular for the electrically conductive connection of a sensor in an electronic control unit, preferably in an electronic control unit for operating an electric compressor. The plug connector assembly comprises at least one plug connector (2) for establishing an electrically conductive connection and a holder (10) for the plug connector, wherein an electrical conductor in the plug connector (2) is electrically conductively connected to a cable (13) at a first end in a plug-in direction (S) of the plug connector (2) into a socket for the plug connector and has an electrically conductive contact means (14) at a second end in the plug-in direction.In this case, the plug connector (2) and the holder (10) for the plug connector form bearing elements in an assembled state, by means of which the plug connector (2) is movable in the two spatial directions perpendicular to the insertion direction (S). According to the invention, the plug connector (2) has two guide springs (3) and the holder (10) for the plug connector has two guide grooves (11), by means of which a tongue and groove connection is formed between the plug connector (2) and the holder (10) for the plug connector. The design of the tongue and groove connection ensures mobility in the two spatial directions perpendicular to the insertion direction (S) of the plug connector in the assembled state.

1. The name of the design product: Flatness Measuring Instrument. 2. The use of the design product: Used for measuring the flatness of form and position tolerances. 3. The design key points of the design product: Lies in the shape. 4. The picture or photo that best shows the design key points: Stereogram.

The present application relates to the technical field of slow wire mechanical processing, and provides a composite pipe shell high-precision shape and position tolerance processing technology, which comprises the following steps: processing a pre-hole in the composite pipe shell to release stress; measuring the coaxial degree shape and position tolerance of the composite pipe shell after pre-processing; hydrogen burning straightening of the composite pipe shell to eliminate stress; measuring the shape and position tolerance of the composite pipe shell after straightening, and recording the position change of the high and low point positions of the coaxial degree measurement on the pole shoe; and adjusting the center position of the composite pipe shell processing according to the recorded high and low point positions of the coaxial degree. Through the process mode of increasing the pre-processing inner diameter, measuring the shape and position tolerance, hydrogen burning straightening of the composite pipe shell, measuring the shape and position tolerance after straightening, and adjusting the processing center position during the composite pipe shell machining process, the composite pipe shell reaches high-precision shape and position tolerance precision, and the coaxial degree reaches Φ0.01mm.

The present invention discloses an aluminum part marking and inspection device, comprising a feed mechanism and a discharge mechanism, with a form and position tolerance inspection mechanism, a marking mechanism, a hardness tester marking mechanism, and a hardness tester intersecting the feed mechanism and the discharge mechanism sequentially arranged therebetween. The form and position tolerance inspection mechanism is used to perform form and position tolerance inspection on the four sides and bottom of the aluminum part; the marking mechanism is used to mark the sides of the aluminum part and inspect the marking position and content; the hardness tester marking mechanism is used to mark the aluminum part; and the hardness tester is used to detect concave points on the aluminum part, thereby inspecting the hardness of the aluminum part. The present invention has high production efficiency, high-speed, high-precision inspection capabilities, and is adaptable to the production and inspection of aluminum parts of different specifications and requirements.

The application relates to the field of machining of long-shaft parts in certain helicopters, in particular to a machining method for guaranteeing shape and position tolerances of key assembly holes of long-shaft parts. According to the machining method, after the part is clamped, the outer cylinder inclination error is measured on the machine tool, the measuring points should be close to the two ends of the outer cylinder, according to the measured value, the coordinate system is compensated after formula calculation, then the hole is bored to the final size, and the symmetry requirement is guaranteed. The symmetry requirement of the two groups of key assembly holes and the outer circle reference of the part can be effectively controlled, and the qualified rate of the part is improved. Meanwhile, the method can also be used for compensation machining calculation of related shape and position tolerances of shaft parts with similar structures.

This utility model relates to a pump body form and position tolerance inspection fixture, including a positioning mechanism connected to the pump body, a guide shaft coaxially rotatably connected to the pump body through the positioning mechanism, and a detection mechanism connected to the guide shaft. The positioning mechanism includes a positioning plate connected to the guide shaft and used for connecting the guide shaft to the pump body, and a mounting seat sleeved on the guide shaft to limit the axial displacement of the guide shaft. By setting the positioning mechanism, the guide shaft can be connected to the pump body, and the rotation of the guide shaft can be limited laterally and axially to improve the stability of the guide shaft rotation and improve the accuracy of detecting the form and position tolerance of the pump body. The positioning plate has multiple installation steps, so that the fixture can be adapted to different pump body inlet ring diameters. At the same time, the convenient adjustment between the two sets of positioning plates can shorten the installation time of the inspection and improve the inspection efficiency.

The utility model provides detection equipment for form and location tolerance of a flange, which comprises a supporting bottom plate, a clamping mechanism for clamping a flange plate on the supporting bottom plate, a displacement sensor, a rotating motor and an adjusting mechanism, an output shaft of the rotating motor drives the flange plate to rotate synchronously by being connected with the fixed clamping mechanism, and the adjusting mechanism is used for adjusting the position of the displacement sensor. The device has the advantages of being reasonable in structural design, convenient to operate, time-saving, labor-saving and high in adaptability.

The invention discloses a machining method for improving the dimensional form and location tolerance precision of the inner wall of a hole of a steel plate cylinder part, and relates to the technical field of motors, and the machining method comprises the following machining steps: S1, carrying out radial plastic deformation expansion shaping on a steel plate cylinder through a bulging machine with staggered teeth on a bulging mould petal, the plastic deformation radial expansion amount calculation formula is delta d = 1.2 d delta t / E; s2, after relevant parts are welded to the outer wall of the steel plate cylinder, the steel plate cylinder is fixed to a vibration aging platform through a pneumatic clamping jaw to be subjected to vibration aging treatment, and internal stress of the steel plate cylinder is removed; s3, the steel plate cylinder is subjected to radial elastic deformation expansion shaping through a bulging machine without staggered teeth on the bulging mould petals; and S4, shot blasting treatment is conducted on the surface of the steel plate cylinder, and surface dirt and an oxide layer are removed. When the machining method is used for manufacturing the steel plate cylinder part for the motor, machine tool cutting machining is avoided, materials, labor and time are saved, and operation is fast and convenient.

The invention relates to a steel member form and location tolerance detection device based on BIM model guidance. The steel member form and location tolerance detection device comprises an upper computer, a laser range finder, an angle sensor, a three-axis attitude adjusting rotary table, a three-axis attitude adjusting sliding table support, a high-power laser, an ultrasonic thickness gauge and a laser target ruler. The three-axis attitude adjusting rotary table is installed on the three-axis attitude adjusting sliding table support, and the laser range finder is installed on the three-axis attitude adjusting rotary table. The ultrasonic thickness gauge is located on one side of the steel member, the laser target ruler is fixed to the steel member, and a laser point of the laser range finder irradiates the position, with the scale being x, of the laser target ruler. Compared with the prior art, the position and angle of the laser range finder are adjusted by adopting the three-axis attitude adjusting rotary table and the three-axis attitude adjusting sliding table bracket, so that actual measurement data can accurately correspond to design data in a steel member BIM model one by one; the method has the advantages that actual steel components are measured, whether the sizes of the steel components are qualified or not can be known, and the acceptance efficiency and reliability are greatly improved.

The invention relates to a device and method for detecting the longitudinal position tolerance and the surface profile tolerance of an automobile cross beam, and the device comprises a detection platform, the detection platform is provided with a detection tool and a tool support frame, and the opening of a tool groove of the detection tool is transversely arranged; a material receiving frame and a transverse moving unit are arranged on the detection platform in a sliding manner; a material receiving plate and an overturning motor are arranged on the material receiving frame; the receiving plate is provided with a leaning plate, an X-axis roller assembly, a first open groove, a first lifting unit, a Y-axis roller assembly, a second open groove and a second lifting unit. The X-axis roller assembly comprises a left side roller set and a right side roller set and further comprises a distance adjusting unit for adjusting the distance between the left side roller set and the right side roller set. By applying the device, the device can be matched with a gantry crane in an existing mold workshop, the automobile cross beam is accurately positioned and fed into a detection jig to be detected, a six-axis robot can be replaced, and the cost needed by equipment is greatly reduced.

This invention discloses a method for predicting the motion straightness of an L-shaped worktable on a mortise and tenon broaching machine. The method includes: acquiring the motion pose error of the top surface of the slider, the form and position tolerances of the assembly surface, and the structural dimensions of the worktable; calculating the pose error of the tool holder mounting surface considering the superposition of worktable form and position errors based on the aforementioned motion pose error, assembly surface form and position tolerances, and worktable structural dimensions; and calculating the motion straightness of the tool holder mounting surface of the L-shaped worktable based on the pose error of the tool holder mounting surface considering the superposition of worktable form and position errors. Based on the deformation coordination principle and the small displacement screw theory, and utilizing error propagation modeling techniques, factors such as guide rail straightness and parallelism errors, and worktable form and position errors are mapped into the motion straightness prediction model of the L-shaped worktable on the mortise and tenon broaching machine. This effectively solves the problem of accurately predicting the motion straightness of a worktable supported by multiple non-coplanar guide rails.

The invention discloses a mechanism for improving location degree on-line measurement precision, which comprises a supporting plate and foot pads, the foot pads are arranged at uniform positions of the bottom end of the supporting plate, the foot pads are bolted to the supporting plate through screws, a first stand column is arranged at the left side position of the top end of the supporting plate, and a second stand column is arranged at the right side position of the top end of the supporting plate. The first stand column is connected to the supporting plate through a screw in a bolted mode, a first calibration block is arranged at the top end of the first stand column and connected to the first stand column through a screw in a bolted mode, the first calibration block and the second calibration block for measured features and reference coordinates are shot at the same time, calculation is conducted through a formula, and the position degree is calculated. According to the method, the influence of a robot kinematics model is completely eliminated, meanwhile, the registration error is introduced, but the registration error is far smaller than the error of the robot kinematics model and can be corrected and improved through various methods, and through the methods, the accuracy of position degree measurement is greatly improved.

The utility model discloses a detection device, which comprises a positioning mechanism, a positioning column and a detection mechanism, and is characterized in that the positioning mechanism comprises a positioning plate, and the positioning plate is provided with a positioning hole; at least part of the positioning column is arranged in the positioning hole, the positioning column and the inner wall of the positioning hole are arranged at an interval to form a positioning gap, and the tested component is arranged in the positioning gap and can be in contact with any one of the inner wall of the positioning hole and the peripheral wall of the positioning column. At the moment, whether the detected part is in contact with the other one of the inner wall of the positioning hole and the outer peripheral wall of the positioning column is detected through the detection mechanism, whether the form and location tolerance such as the coaxiality of the detected part is qualified or not can be rapidly judged, and the detection efficiency of the form and location tolerance of the detected part is effectively improved.