Summary of the invention
The purpose of this utility model solves the above-mentioned problems in the prior art exactly, and a kind of measurement needs that can meet different tube diameters tubing are provided, and error is little, be easy to carry, easy to operate, reading is directly perceived, not fragile, and the very low internal diameter of the pipeline surveyors' staff of cost.
For completing above-mentioned purpose, technical solution of the present utility model is: a kind of internal diameter of the pipeline surveyors' staff, and it comprises the circular standard extension bar of telescopic joint and a joint, two joints or more piece regular length; Telescopic joint includes the circular shell of center hole, with circular scale, spring and the spring pedestal of indicating the exact scale of telescopic joint length; The front end of scale is connected with ball, the rear end spring footstock that portals slightly thick than housing that is integrated or is fixed as one; Housing front end has and portalling that scale matches, and spring footstock and spring pedestal and housing center hole match; Scale and spring footstock are placed in housing, and scale leans out housing and portals; Spring pedestal front end is fixed on outer casing back; Spring is placed in housing, and its front and back ends withstands on respectively on spring footstock and spring pedestal, and each standard extension bar is sequentially fixed together, and the front end of the standard extension bar of its front end is fixed on the rear end of spring pedestal, and the rear end of end standard extension bar is connected with another ball.
Spring pedestal front end screw thread described above is fixed on housing rear end, and each standard extension bar order screw thread is fixed together, and the front end screw thread of the standard extension bar of front end is fixed on spring pedestal rear end.
Housing described above forms by round jacket with the fixing cutting ferrule of round jacket screw thread; Spring footstock and spring pedestal and round jacket center hole match, and cutting ferrule front end has and portalling that scale matches.
While measuring pipe internal diameter, first according to the large young pathbreaker's telescopic joint of pipe diameter, end standard extension bar and the standard extension bar that wherein needs, be assembled into the survey instrument that length is slightly larger than pipe internal diameter, the hand-held survey instrument of survey crew enters in the middle of tubing, by survey instrument along tubing radially, making survey instrument two ends ball withstand pipe material inner wall slides, find out minimum dimension, the length of adding each standard extension bar is tubing hoop internal diameter.The utility model can meet the inner diameter measurement needs of different tube diameters tubing, and reading is directly perceived, and error is little, can reach pipe internal diameter and measure national standard; It is easy to carry, easy to operate, not fragile, and cost is very cheap.It,, at pipe internal diameter hoop with in axially measuring, does not damage concrete surface, is easy to put into and take out, and small volume, recycles rate higher.It is not only suitable for the measurement of PCCP pipe internal diameter, is also suitable for the measurement of other all pipe internal diameters.
Accompanying drawing explanation
Fig. 1 is the structural representation after each parts of the present utility model connect;
Fig. 2 is the structural representation of telescopic joint in the utility model;
Fig. 3 is the structural representation of one of them intermediate standard extension bar in the utility model;
Fig. 4 is the structural representation of end standard extension bar in the utility model.
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the present embodiment comprises the circular standard extension bar 10,12 of telescopic joint 2 and two joint regular lengths.Telescopic joint 2 includes the circular shell 7 of center hole, with indicating circular scale 3, the spring 8 of the exact scale of telescopic joint length and having externally threaded spring pedestal 9.The front end of scale 3 is connected with ball 1, the ratio housing that rear end the is integrated 4 slightly thick spring footstocks 6 that portal.Housing 7 forms by round jacket 16 with the fixing cutting ferrule 5 of round jacket 16 screw threads; Spring footstock 6 and spring pedestal 9 matches with round jacket 16 center holes, and cutting ferrule 5 front ends have with scale matches and portal 4.Scale 3 and spring footstock 6 are placed in housing 7, and what scale 3 leant out cutting ferrule 5 portals 4.Spring pedestal 9 front end screw threads are fixed in housing 7 rear end threaded holes.Spring 8 is placed in housing 7, and its front and back ends withstands on respectively on spring footstock 6 and spring pedestal 9.Externally threaded threaded column 15 screw threads that have of end standard extension bar 12 front ends are fixed in standard extension bar 10 rear end threaded hole 14, the front end threaded hole 14 of the standard extension bar 10 of its front end is fixed on the rear end of spring pedestal 6, and end standard extension bar 12 rear end is connected with another ball 13.
Embodiment described above also can only include as required end standard extension bar one joint or comprise the more standard extension bar of more piece, and each feast-brand mark bar order screw thread is fixed together.