CN2067818U

CN2067818U - Multi-functional tester for inside thread

Info

Publication number: CN2067818U
Application number: CN 90200095
Authority: CN
Inventors: 高延新; 王文义
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 1989-12-28
Filing date: 1989-12-28
Publication date: 1990-12-19

Abstract

The utility model provides a digital display type comprehensive measuring instrument which can directly measure the virtual pitch diameter of the internal thread. The instrument is composed of a mechanical section and a circuit section. The mechanical section is mainly composed of fixed and movable guideways, fixed and movable comprehensive gauge heads, an instrument body and a dynamometer spring, and the circuit section is composed of a sensor and a digital display section. The instrument can measure the work pieces whose virtual pitch diameters ranges from M130 mm to M150 mm. The instrumental resolution is 0.01 mm, and the comprehensive accuracy is 0.02 mm. A couple of comprehensive gauge heads can measure the internal threads which has the same screw pitch, the same half of thread angle but different effective diameters.

Description

Multi-functional tester for inside thread

The utility model relates to a kind of survey instrument that is used for standard component in-process gaging internal thread.

The method of traditional measurement internal thread is to use plug thread gage measurement.Advantages such as it has the checkability height, and is easy to use.But for single-piece, small lot batch production, particularly large-sized internal thread, just very inconvenient, also very uneconomical with the plug thread gauge check.And can only judge that tested internal thread is whether qualified and can not get the numerical value in footpath in its practical function with this method of inspection.This point also is inconvenient for the feed control that solves in the screw thread process.

The purpose of this utility model, a kind of numerical value of footpath on that can in the screw thread process, momentarily detect screw thread that proposes in order to address the above problem exactly, in time adjust the depth of cut, can judge the whether qualified internal thread general measuring instrument of processed internal thread workpiece simultaneously again.

The principle of work of this instrument as shown in Figure 1.It mainly is made up of the two large divisions: (1) mechanical driving part, it comprises machine measuring instrument main body 4, movable guiding rail 5, fixed guide 2, movable gauge head 6, fixedly gauge head 1, dynamometer spring 7, adjustment screw 3 and digital display window 8.By in accompanying drawing 3 and the accompanying drawing 4 as can be seen, fixedly gauge head 1 is installed on the fixed guide 2, fixed guide 2 is slidingly connected with main body 4, fastening adjustment screw 3 is installed on the fixed guide 2, movable gauge head 6 is installed on the movable guiding rail 5, and movable guiding rail 5 bottoms are connected with dynamometer spring 7, and 7 are installed in the spring groove, movable guiding rail 5 be arranged in parallel with fixed guide 2, maintains a small gap between two guide rails.(2) conversion of signals and digital display portion, it is the capacitive displacement transducer system, it includes two pole plates, and one is fixed polar plate, sticks on the fixed guide, the repeller of palisade is housed above, another is movable pole plate, is connected with movable guiding rail, and emitter, receiving pole and integrated circuit modules display, power supply etc. are housed above, emitter and receiving pole are at grade, and be parallel with repeller and maintain a minim gap.

When using this general measuring instrument to measure internal thread workpiece, press the method shown in the accompanying drawing 2 earlier, utilize screw thread three pins and gauge block in gauge block presss from both sides to good instrument zero-bit.One hand instrument then, another hand is pressed into apparatus subject with movable gauge head, whole measuring instrument is put into the measured workpiece endoporus, movable gauge head stretches out in body under the effect of spring force, thereby make two gauge heads and tested internal thread tight engagement, can demonstrate the tested internal thread concrete numerical value in footpath on from capacitive displacement transducer.The movable gauge head of this instrument has the stroke of 15mm, fixedly gauge head is owing to be installed on the fixed guide, so it is relative with main body motionless during work, but become flexible the special-purpose trip bolt on it, just can adjust the position of the relative main body of fixed guide, thereby obtain the measurement range to the 50mm of 180mm by 130mm.When the pitch of tested internal thread changed, the composite measurement head that only needs to change its corresponding specification got final product.

The measuring head of this instrument is a pair of comprehensive gauge head.It must have the high precision standard tooth form, and goes for measuring the thread part of plurality of specifications, to enlarge the scope of application and to improve the gauge head utilization factor.Learn through a large amount of actual test and theoretical analysis, in middle footpath error that double thread interchangeability has the greatest impact, pitch error, half of thread angle error, wherein single in the having the greatest impact of footpath error, and the influence of pitch and half of thread angle error is less comparatively speaking.As long as so solved the adaptability that gauge head centering directly changes, just can improve measurement range significantly.Because two different screw threads in the identical and middle footpath with half of thread angle of pitch, their tooth forms on the axle section are on all four, thus with the form of thread gauge head with certain pitch and half-angle just can measure different in directly screw thread.But must be noted that the middle footpath d of common gauge head ₂Always less than the middle footpath D of tested internal thread ₂, so their lead angle degree difference makes the tooth form of comprehensive gauge head and tested internal thread tooth form tight engagement well to occur interference even like this.In order to eliminate this problem, when making comprehensive gauge head, be that first grinding goes out right-hand thread, and then go out left-hand thread (LHT) by identical pitch and half of thread angle grinding, the comprehensive gauge head that produces like this, can not only reflect the influence (promptly footpath) on of footpath error double thread interchangeability in the pitch error, half of thread angle sum of errors of tested internal thread, and as long as the nominal pitch internal thread identical with half of thread angle, though wherein the footpath is different, can be with measuring with a pair of comprehensive gauge head.From thread standard, the half of thread angle of metric thread is 30 °, and to the internal thread of big specification, and the kind of pitch also has only limited several.Therefore the applicability of this kind general measuring instrument is very wide.When the comprehensive gauge head of actual manufacturing,, make several to comprehensive gauge head as long as refining external thread just can be divided into several.

Conversion of signals of this general measuring instrument and display part are to realize by a complete capacitive displacement transducer system, are characterized in that little power consumption, antijamming capability are strong, are applicable to that very the technology in producing under the shop condition is measured.Accompanying drawing 5 is its systematic schematic diagrams.(b) holds the grid structural representation among the figure.The drive signal of sensor is that phase differential is the loop square-wave signal of π/4.It is obtained through fixed frquency divider by time clock.Drive signal adds on the emission pole plate, after the induction of reflection pole plate, frequency of generation is 15HZ on the pole plate receiving, phase place is paid the sinusoidal signal that a relative shift changes with grid then just can send into up-down counter through processing such as amplification, shaping, phase demodulations, demonstrates numeric results at last on LCD.

The mechanical part material of this instrument can with stainless steel or No. 45 steel through mill, operations such as brill, mill, thermal treatment are shaped, displacement sensor of variable capacitor can be selected the product of typing for use, as appearance grid position multisensor or some imported product in the capacitance-grid type slide calliper rule of Beijing's measurer factory production, its entire circuit is integrated in the module, can make instrument dexterity, light.

This measuring instrument can be measured the metric system internal thread of the various pitch of M130-M180mm, and the resolution of instrument digital display part is 0.01mm, and composition error is 0.02mm.

Description of drawings:

Fig. 1 is the connection diagram of capacitive displacement transducer and movable guiding rail and fixed guide, has expressed the block diagram of counting, display circuit among the figure.

Fig. 2 is the synoptic diagram of this general measuring instrument when measuring.10 zero setting keys, 11 metering pins wherein.

Fig. 3 is this measuring instrument mechanical driving part basic structure side view.

Fig. 4 is this measuring instrument mechanical driving part basic structure top view.

Fig. 5 a is that systematic schematic diagram Fig. 5 b of capacitive displacement transducer is appearance grid structural drawing.

Claims

1, a kind of measuring instrument that is used for measurement standard spare internal thread, comprise capacitive displacement transducer and counting, display circuit, it is characterized in that this measuring instrument also includes fixedly gauge head 1, fixed guide 2, adjust screw 3, main body 4, movable guiding rail 5, movable gauge head 6, dynamometer spring 7, digital display window 8, wherein fixedly gauge head 1 is installed on the fixed guide 2, fixed guide 2 is slidingly connected with main body 4, fastening adjustment screw 3 is installed on the fixed guide 2, and movable gauge head 6 is installed on the movable guiding rail 5, and movable guiding rail 5 bottoms are connected with dynamometer spring 7,7 are installed in the spring groove, movable guiding rail 5 be arranged in parallel with fixed guide 2, maintains a small gap between two guide rails, and the fixed polar plate of capacitive displacement transducer sticks on the fixed guide, the palisade repeller is housed above, movable pole plate sticks on the movable guiding rail, and emitter is housed above, receiving pole, integrated circuit modules, display and power supply, emitter and receiving pole be on same plane, and be parallel with repeller and maintain a small gap.