CN2049346U

CN2049346U - Straightness measurer for long tube inside diameter

Info

Publication number: CN2049346U
Application number: CN 89204274
Authority: CN
Inventors: 王铁民; 孙大勇
Original assignee: TIANJIN ELECTRICAL MACHINERY G
Current assignee: Siboteke Submerged Electric Pump Co., Ltd., Tianjin
Priority date: 1989-04-08
Filing date: 1989-04-08
Publication date: 1989-12-13

Abstract

The utility model relates to a straightness measurer for long tube inside diameter, which has a bridge gauge main body which has two fixed annular fulcrums. A measuring bar which can only move from top to bottom is arranged on the tube wall of the straightness measurer for long tube inside diameter; a force transmitting device which is arranged in the main body transmits the force of the measuring bar to a sensor which is arranged at one end of a supporting frame and makes the deviation value of the straightness of a measured member display on a double-displayer through electric cables. The utility model has the advantages of simple structure and high measuring precision; the straightness measurer for long tube inside diameter is convenient to be adjusted and is in particular suitable for measuring the straightness of the long tube inside diameter, such as the motor stator of an oil-submersible electric pump.

Description

Straightness measurer for long tube inside diameter

The utility model relates to a kind of measuring instrument of measuring long tube internal diameter linearity.

Before the utility model was made, domestic common usage level instrument, optical collimator and laser collimator were measured the endoporus linearity, but involving great expense of having of these instruments adjusted trouble, and the precision that has is low, poor anti jamming capability.Two kinds of similar apparatus measures internal diameter linearitys of external use at present, the one, mechanical tabular form, its shortcoming is not see line, observed reading inconvenience at a distance; Another kind is an air-gauge, and its shortcoming is to need distribution pump, voltage stabilizer etc., uses not nimble.

The purpose of this utility model is to avoid the above-mentioned weak point of prior art and a kind of long tube internal diameter Instrument for Straightness is provided.

The purpose of this utility model is finished by following measure:

An annular fulcrum respectively is housed on the two ends external diameter of bridge gauge main body of the present utility model, on the tube wall of bridge gauge main body, be equipped with one only with movable up and down measuring staff, its termination of stretching in the main body is against on the L-shaped force transmitters, on the measuring staff center line, across the top of force transmitters an adjustment screw that is installed in threadably on the main wall is arranged, one end of force transmitters is hinged with pin and L-shaped support, have on support one end face and be equipped with in the through hole of a parallel other end with the fastening sensor of screw, one end head is against on the force transmitters, sensor and support are fastened on the main wall by dog screw, another termination electricity consumption cable is connected with two display instruments, in a termination of bridge gauge main body one pull bar is housed also.

On the bridge gauge main wall that screw one termination is housed towards support, have one for ease of dismounting with adjust the slotted hole that part is used in the main body.

Description of drawings:

Fig. 1 is the structural representation of the utility model under in working order;

Fig. 2 is the D-D cut-open view of Fig. 1.

Below in conjunction with accompanying drawing the utility model embodiment is described in further detail:

The bridge gauge main body 1 of tubulose, on the external diameter at its two ends with each fastening annular fulcrum 2 of screw; The pipe box 4 of band key pin 3 is housed on the tube wall of main body, have in the pipe box band keyway and can only be in cover the measuring staff 5 of upper and lower activity; Measuring staff is equipped with gauge head 6 on a termination of tube wall outside, another termination of measuring staff is against on the L-shaped force transmitters 8; On the measuring staff center line across there being one to be installed on the main wall adjustment screw 9 that the restriction force transmitters moves threadably above the force transmitters; Force transmitters is hinged with the L-shaped support 10 of pin 16 and profile, have on one end face of support and be equipped with in the through hole that is parallel to the other end with the fastening sensor 11 of screw, support is fastened on the main wall by the slotted eye that dog screw 7 passes main wall 17 places, owing to spring is housed in the end of sensor, acting force is against on the vertical end on the force transmitters all the time; The other end of sensor is connected with two display instruments 13 by cable 12; 18 places of bridge gauge main wall have one for the ease of dismounting with adjust the slotted hole that the part in the main body is used; A pull bar 15 that spurs bridge gauge when measuring measured object 14 back and forth also is housed in bridge gauge main body one termination.

Gauge head C point is formed 3 points with stationary annular fulcrum A and B as seen from Figure 1, under the effect of the spring force of adorning in sensor, by force transmitters pushing measuring staff gauge head is contacted all the time with the plain line of measured object bore area.Under tested plain line straightened condition, gauge head C point drops on the line of two point of fixity A, B, and at this moment the pointer of two display instruments and numeral all should show zero, and promptly tested position is straight.If measured object is crooked, gauge head A, B line relatively departs from up or down, be that gauge head C point produces the certain displacement amount, the size of this displacement produces the electric signal of corresponding size by the contact of gauge head, measuring staff and force transmitters promotion sensor, by the two display instruments of cable input, just can be directly demonstrate the deviate of this position linearity from pointer and luminous digital.The jumper line can be measured 50 meters with interior linearity deviation.

Important technological parameters of the present utility model:

1, measuring straightness error scope: ± 0.05 μ m～± 1999 μ m(divide third gear);

2, scale division value: 0.01 μ m; 0.1 μ m; 1.0 μ m;

3, stability of display: start shooting and be not more than 0.005mm/4 hour after 30 minutes

4, reproducibility error: measure 10 result errors and be not more than 0.005mm(± 1000 μ m shelves);

5, the error of indication: ± 10 μ m shelves:＜± 0.05 μ m; ± 100 μ m shelves＜± 0.5 μ m; ± 1000 μ m shelves＜± 10 μ m;

6, check and correction " 0 " position precision: identical with " 0 " level leveling ruler linearity;

7, interference free performance: electric hand drill is the switch several near each position of instrument, and indicating value does not have any variation, does not have influence to measuring during slight vibration.

Use the utility model to measure the concrete instance of long 6 meters of submersible electric machine with oil stator inner hole (φ 54): the end of the utility model along tested motor stator endoporus inserted, whenever push ahead 350mm(one joint stator core length), tested stator rotate a circle (360 °), read deviation range, and carry out mark at maximum extreme value place (cylindrical) so as to repair, straightening.Press the drawing technical requirement, the long linearity deviation of every 700mm should be less than 0.05mm.The straightening while measuring so just can guarantee whole each position of motor stator, and linearity deviation at an arbitrary position is all within acceptability limit.

The utility model has the advantage of: both can be used for static measurement, can be used for again kinetic measurement; Both can measure continuous surface, also can measure continuing the surface. After being subjected to extraneous interference and measuring the length increase, certainty of measurement can not reduce. Be particularly suitable for the large-scale long part of workshop in-site measurement, such as extraordinary electric pump (submersible electric pump), its motor stator length big (6--10m), aperture little (φ 54--72), use this measuring instrument just can in measuring process, eliminate the bending error that the elongated tubular deadweight produces, correctly reflect the linearity of actual size.

Claims

1, a kind of measuring instrument of measuring long tube internal diameter linearity, it is characterized in that on the two ends external diameter of bridge gauge main body an annular fulcrum being housed respectively, on the tube wall of bridge gauge main body, be equipped with one only with movable up and down measuring staff, its termination of stretching in the main body is against on the L-shaped force transmitters, the one end is hinged with pin and L-shaped support, have on support one end face in the through hole of a parallel other end and be equipped with by the fastening sensor of screw, one end head is against on the force transmitters, sensor and support are fastened on the main wall by dog screw, another termination electricity consumption cable is connected with two display instruments, in a termination of bridge gauge main body one pull bar is housed also.

2, measuring instrument according to claim 1 is characterized in that having one for ease of dismounting with adjust the slotted hole that the part in the main body is used on the bridge gauge main wall.