CN204854599U - Offset measuring apparatu - Google Patents

Abstract

The utility model discloses an offset measuring apparatu, including fixing base, eccentric reading device, measuring device and positioner, open at the fixing base middle part has the mesopore that vertically runs through, and stem stem slidable mounting is in the mesopore, open to have on the fixing base and transversely run through the groove and vertically run through the groove, the axial lead of surveying round pin and the positioning core axle just up end of perpendicular to fixing base that is parallel to each other. The utility model discloses as long as change different positioning core axles and adjustment dabber seat, survey the position of key seat, with regard to various pump body class parts of measurable quantity and similar part offset, the commonality is strong, offset between can quick accurate two eccentric orfices of measurement, and convenient operation, detection efficiency are high, are favorable to reducing and detect the cost, measure moreover that numerical value is reliable and stable, the precision is high, and the data display is directly perceived, is convenient for master.

Description

A kind of eccentricity measuring instrument

technical field

The utility model relates to the technical field of measuring instruments, in particular to an eccentricity measuring instrument.

Background technique

At present, in the domestic mechanical processing industry, namely motorcycle cycloidal rotor oil pump and automobile lubrication pump manufacturing industry, the eccentricity measurement of existing pump body parts and similar parts usually uses special eccentric plug gauges, three-coordinates, and vernier calipers. The design of the special eccentric plug gauge adopts the principle of tolerance, which can only be judged qualitatively, but not by reading. Due to the influence of the diameter of the center hole and eccentric hole of the processed part and the manufacturing accuracy of the eccentric plug gauge itself, it is difficult to accurately determine whether the eccentricity of the workpiece is qualified, that is, it is possible The qualified products are misjudged as unqualified, and the unqualified products may also be judged as qualified outflow. Three-coordinate measurement can accurately determine, but the detection cost is high and it is not suitable for mass detection. The vernier caliper measurement is an indirect measurement, that is, the farthest and shortest distances between the two holes are measured with the inner measuring feet of the caliper, and then the value obtained by subtracting the two measured values and dividing by 2 is the eccentricity of the two holes; this measurement method is inaccurate. The measurement results of different personnel are different, and the measurement judgments of the two parties are often inconsistent; the measured value is an indirect measurement, and the final measured value is a calculated value, which is not intuitive and prone to errors. The existing various inspection methods have low inspection and judgment efficiency or unreliable judgment, and are not suitable for mass inspection. Therefore, it is imperative to design an efficient, reliable, and widely applicable general-purpose eccentricity measuring instrument that can overcome the existing problems.

Utility model content

In order to overcome the above-mentioned technical defects, the purpose of this utility model is to provide an eccentricity measuring instrument with intuitive and reliable reading, reliable positioning principle, reasonable structure, convenient replacement and adjustment, and wide application range.

In order to achieve the above object, the utility model is realized through the following technical solutions:

The technical solution is an eccentricity measuring instrument, which includes a fixed seat, an eccentric reading device, a measuring device and a positioning device; the eccentric reading device is composed of a core column, a floating block, a measuring pin seat and a measuring pin, and the middle part of the fixing seat is There is a longitudinal through hole, and the stem is slidably installed in the middle hole; the fixed seat is provided with a transverse through groove and a longitudinal through groove, and the floating block is fixed through the stem and arranged in the transverse through groove, and The floating block is in contact with the bottom of the transverse through groove and can slide relatively. The measuring pin is fixedly installed on the floating block through the measuring pin seat; the measuring device is composed of a dial indicator, a dial indicator seat and a pressure spring for measuring force. The dial indicator is fixedly connected to one end of the fixed seat through the dial indicator seat, the dial indicator probe is in contact with the end face of the stem column and the center of the dial indicator probe is facing the center of the stem column; the front end of the dial indicator is installed to measure pressure The spring and the force measuring pressure spring are arranged between the end face of the mandrel and the dial indicator seat; the positioning device is composed of the mandrel seat and the positioning mandrel, and the positioning mandrel is slid and installed in the longitudinal through groove of the fixed seat through the mandrel seat; The axis lines of the positioning mandrel and the measuring pin are parallel to each other and perpendicular to the upper end surface of the fixing seat. The function of the measuring instrument: when the measured workpiece installed on the positioning mandrel rotates in the same direction for measurement, the dial indicator in the eccentric reading device displays the measured value from small to large, and then from large to small, and the maximum measured value The difference from the minimum measured value is twice the value of the eccentricity of the tested part.

As an optimization, the measuring pin seat and the mandrel seat can be installed in reverse 180°, which is suitable for testing workpieces with different apertures and enhances the versatility of the measuring instrument.

As an optimization, for testing different parts, the fixed part of the positioning mandrel in the mandrel seat remains unchanged, which enhances the versatility of the equipment and saves materials.

Compared with the prior art, the beneficial effect of the utility model is that the utility model can measure the eccentricity of various pump body parts and similar parts as long as the different positioning mandrels are replaced and the positions of the mandrel seats and the measuring pin seats are adjusted. , strong versatility, can quickly and accurately measure the eccentricity between two eccentric holes, easy to operate, high detection efficiency, and help to reduce detection costs, and the measurement value is stable and reliable, high precision, intuitive data display, easy to grasp.

Description of drawings

The utility model will be explained by way of example and with reference to the accompanying drawings, wherein:

Fig. 1 is a schematic diagram of the main structure of the utility model;

Fig. 2 is the top view of the utility model;

Fig. 3 is the right view of the utility model;

Marks in the figure: fixed seat 1, core column 2, floating block 3, measuring pin seat 4, measuring pin 5, dial indicator 6, dial indicator seat 7, force measuring compression spring 8, mandrel seat 9 and positioning mandrel 10.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail.

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Embodiment 1, as shown in Fig. 1, Fig. 2 and Fig. 3, the utility model is a kind of eccentricity measuring instrument, comprises fixed base 1, eccentricity reading device, measuring device and positioning device; Described eccentricity reading device consists of core Composed of column 2, floating block 3, measuring pin seat 4 and measuring pin 5, the middle part of the fixed seat 1 is provided with a longitudinally penetrating middle hole, and the core column 2 is slidably installed in the middle hole; the fixed seat 1 is provided with a transverse The through groove and the longitudinal through groove, the floating block 3 is fixed through the stem 2 and arranged in the transverse through groove, the floating block 3 is in contact with the bottom of the transverse through groove on the fixed base 1 and can slide relatively, the measuring The pin 5 is fixedly installed in the middle hole of the measuring pin seat 4, and the measuring pin 5 is fixedly installed on the floating block 3 through the measuring pin seat 4; Composition, the dial indicator 6 is clamped and installed on the dial indicator seat 7, the dial indicator 6 is fixedly connected to one end of the fixed seat 1 through the dial indicator seat 7, the dial indicator 6 measuring head is in contact with the end surface of the core column 2 and The center of the measuring head of the dial indicator 6 is facing the center of the core column 2; the front end of the dial indicator 6 is equipped with a force-measuring compression spring 8 and the force-measuring compression spring 8 is arranged between the end surface of the mandrel 2 and the dial indicator seat 7; The positioning device is composed of a mandrel seat 9 and a positioning mandrel 10, the positioning mandrel 10 is fixedly installed in the middle hole of the mandrel seat 9, and the positioning mandrel 10 is slidably installed in the longitudinal through groove of the fixed seat 1 through the mandrel seat 9; The axis lines of the positioning mandrel 10 and the measuring pin 5 are parallel to each other and perpendicular to the upper end surface of the fixing base 3 .

The workpiece to be measured is positioned by the positioning mandrel 10 and installed on the upper end surface of the fixed base 1 . Before measuring by the instrument, first select a positioning mandrel 10 with a corresponding outer diameter according to the diameter of the hole in the part to be tested, and install it into the mandrel seat 9 and fix it. According to the diameter of the eccentric hole of the part to be tested, adjust the distance between the mandrel seat 9 and the test pin seat 4; firstly, fix the test pin seat 4 in the groove of the floating block 3, and then install the mandrel seat 9 to the fixed seat 1 to penetrate longitudinally and move the position in the groove, so that when the workpiece to be measured is installed on the positioning mandrel 10 and rotates, the measuring pin 5 can always be in contact with the inner wall of the eccentric hole, and the floating block 3 is in the two extremes of the transverse penetration groove of the fixed seat 1. The positions will not collide with the groove walls on both sides, that is, the gaps on both sides are basically the same. After satisfying this condition, fasten and position the mandrel 10, and then adjust the clamping position of the dial gauge 6, so that the dial gauge 6 can be in contact with the end surface of the stem 2 when the slider 3 and the stem 2 are displaced to the two limit positions. beyond its range. After the measuring instrument is adjusted, turn the workpiece to be measured. When the turning point of the maximum (or minimum) measured value appears on the dial gauge 6, stop turning the workpiece. Turn the scale of the dial to calibrate the zero position of the scale value of the dial gauge 6 to the turning point. , as the starting point for workpiece eccentricity measurement; then turn the measured workpiece to measure, and record the number of rotations of the hands, which is the scale of the small dial. When the turning point of the minimum (or maximum) measured value appears again, stop rotating. 6 The difference between the upper measured value and the zero position is twice the value of the workpiece eccentricity. During measurement, the center hole of the measured piece is centered and positioned by the positioning mandrel 10 in the positioning device and rotates around it; The displacement is displayed on the dial gauge 6 of the eccentric reading device, and the difference between the maximum and minimum measured values is twice the value of the eccentricity of the measured piece. Both the positioning device and the measuring device have a fine-tuning mechanism, and their relative distances can be adjusted. The mandrel seat 9 and the measuring pin seat 4 are adjustment parts of the measuring instrument, and the relative distance between them is adjustable; the positioning mandrel 10 is a replacement part of the measuring instrument, and its diameter can be replaced. Through the adjustment and replacement of the two, it is suitable for measuring workpieces with different apertures and different eccentricities. The positioning mandrel 10 is a replacement part of the measuring instrument. It is equipped according to the measured parts with different diameters of the middle hole; The influence of the clamping gap caused by the hole machining size deviation on the measured value ensures accurate positioning.

The floating block 3 can move along the axial direction of the core column 2 between the horizontal grooves of the fixed seat 1, and the force-measuring compression spring 8 can not only ensure that the measuring pin 5 is fully attached to the measured part during the part detection, but also can be used when there is no detection part. Make floating block 3 reset during. The function of the measuring instrument: when the measured workpiece installed on the positioning mandrel 10 rotates in the same direction for measurement, the dial gauge 6 of the eccentric reading device displays the measured values from small to large, and then from large to small. The difference between the value and the minimum measured value is twice the value of the eccentricity of the tested part. The displacement of the floating block 3 and the stem 2 drives the pointer of the dial indicator 6 to sway, so that the indication value changes. The mandrel seat 9 can be moved and fixed in the longitudinal through groove of the fixed seat 1; the measuring pin seat 4 is fixedly installed in the groove of the floating block 3, and the measuring pin seat can also be moved in the groove of the floating block 3 according to the aperture and eccentric size to adapt to different objects. Measure parts. The measuring instrument adopts the positioning mandrel 10 parallel to the axis line and the measuring pin 5, the positioning mandrel 10 and the plane positioning workpiece, the displacement of the measuring pin 5 is under the action of the measuring force compression spring 8, and is always in stable contact with the wall of the eccentric hole to be measured. 2. It fits with the hole wall in one direction without clearance, which can eliminate the measurement error caused by the size deviation of the workpiece. The measuring instrument can be quickly and conveniently used to measure the eccentricity between the middle hole and the eccentric hole of the pump body whose centerlines are parallel to each other.

Embodiment 2, on the basis of embodiment 1, optimize the design of the measuring pin seat 4 and the mandrel seat 9, the measuring pin seat 4 and the mandrel seat 9 can be installed in reverse 180°; according to the diameter of the eccentric hole, the measuring pin The seat 4 and the mandrel seat 9 are installed in reverse 180°, so as to adapt to different hole diameters of the measured parts and enhance the versatility of the measuring instrument.

Embodiment 3, on the basis of Embodiment 1, the fixed part of the positioning mandrel 10 is optimally designed. For detecting different parts, the fixed part of the positioning mandrel 10 located in the mandrel seat 9 remains unchanged; the positioning mandrel 10 It is a replacement part of the measuring instrument, which is replaced according to the measured parts with different diameters of the middle holes; the lower installation and fixing parts of various positioning mandrels 10 are uniform in size, which enhances the versatility of the equipment and saves materials at the same time; the positioning mandrels 10 of different sizes are compatible with The hole in the tested part is sliding fit to ensure accurate positioning and stable rotation.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (3)

1. an offset measuring instrument, is characterized in that: comprise holder (1), eccentric reading device, measurement mechanism and locating device;

Described eccentric reading device is made up of stem stem (2), slider pad (3), survey key seat (4) and survey pin (5), and described holder (1) middle part has the mesopore longitudinally run through, and stem stem (2) is slidably mounted in mesopore;

Described holder (1) has and laterally runs through groove and longitudinally run through groove, described slider pad (3) is fixed through stem stem (2) and is arranged at and laterally runs through in groove, and described survey pin (5) is fixedly mounted on slider pad (3) by surveying key seat (4);

Described measurement mechanism is made up of dial gauge (6), dial indicator holder (7) and dynamometry stage clip (8), dial gauge (6) is fixedly connected on one end of holder (1) by dial indicator holder (7), dial gauge (6) gauge head contact with stem stem (2) end face and dial gauge (6) gauge head center just to stem stem (2) center; Described dynamometry stage clip (8) to be arranged between mandrel (2) end face and dial indicator holder (7) and through dial gauge (6) front end;

Described locating device is made up of mandrel seat (9) and positioning core axle (10), and positioning core axle (10) is slidably mounted on holder (1) by mandrel seat (9) and longitudinally runs through in groove;

Described pin (5) and the axial line of positioning core axle (10) surveyed is parallel to each other and perpendicular to the upper surface of holder (3).

2. a kind of offset measuring instrument according to claim 1, is characterized in that: described survey key seat (4) and mandrel seat (9) can reverse 180 ° of installations.

3. a kind of offset measuring instrument according to claim 1, is characterized in that: for detecting different parts, the fixed part that positioning core axle (10) is arranged in mandrel seat (9) is all constant.