JPH0537206Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Field of Industrial Application] The present invention relates to a device for measuring the dimensions of each part of the socket of a cast iron pipe having a socket protruding from a straight pipe portion, which is mainly used for water supply manufactured by centrifugal force method. It is. [Prior art] In addition to forming a conduit by inserting the end of a cast iron pipe (the tip of the straight pipe part) into the socket of the next cast iron pipe to be connected, If the dimensions of each part are not within a certain range, connection will be difficult. Therefore, before shipping cast iron pipes, it is essential to carry out an inspection process to measure the dimensions of the parts where the sockets are required for each individual item. The main dimensions of the socket to be considered here are the socket inner diameters D ₃ , D ₇ , socket tube axial length P, and bolt hole pitch diameter D ₄ as shown in Fig. 6. As shown in Table 1, different control standards are set for the allowable tolerances (upper and lower) depending on the diameter of the pipe, and even for the same diameter depending on the type of pipe (difference in the shape of the socket). There is.

[Table] Here, the socket inner diameters D ₃ , D ₇ , D ₈ and the socket pipe axial length P are conventionally measured for each cast iron pipe using the maximum and minimum gauges, and the required The inspectors manually determined whether the inspection standards were met. Also bolt hole pitch diameter
D ₄ is also inspected using a ring gauge mounted on the hole pitch circle at the desired pitch. These gauges are for each pipe diameter,
Select and use one type for each type of pipe. [Problems to be solved by the invention] There are the following problems when transporting cast iron pipes to a predetermined location and performing manual judgment. (1) Since everything is done manually using a gauge, it takes 25 to 45 seconds per piece.
Efficiency cannot be increased any further than this. (2) The gauge is quite heavy and testing 145 tubes (75φ tube) and 80 tubes (250φ tube) in an hour results in considerable fatigue due to the exhaustion of arm and grip strength. (3) Gauge accuracy control and identification control are complicated. (4) Determination of pass/fail based on gauge check results;
Marking is complicated. On the other hand, all-purpose three-dimensional automatic measuring devices that make full use of recent high-tech technology are now commercially available. For example, there is also an apparatus in which a gate-shaped pedestal is installed above a flat measuring table, and a mechanism for controlling the movement of an X-carriage, a Y-carriage, and a Z-spindle in three directions is provided thereon. A touch signal probe attached to the tip of the Z spindle slides on the surface of the object to be measured guided by a ball screw driven by a servo motor, detects the position in three axes relative to the origin, and performs various measurements. For example, the distance between the centers of two holes in a flat plate, the midpoint thereof, the diameter of the hole, the distance between two opposing sides of a U-shaped article, etc. can be easily implemented. The movement of the prong is precisely controlled, so there is no doubt that it is an advanced measuring device that can measure any object, such as the distance on a curved surface of an object. However, the fact that this measuring device is capable of measuring all types of objects and the fact that it can be applied to the actual measurement problem of cast iron pipe sockets, which this invention is trying to solve, are completely different issues. Even if such an automatic measuring device were installed at a cast iron pipe measurement site, actual measurement would be impossible. In order to solve the above-mentioned problems, the present invention aims to provide a device that eliminates the need for manual gauge adjustment by inspectors and automatically measures the dimensions of each part of the socket with greater accuracy. [Means for Solving the Problems] The automatic dimension measuring device for cast iron pipe sockets according to the present invention is capable of measuring the maximum inner diameter D of cast iron pipes with bulged sockets that have standardized various pipe diameters and shapes. ₇ , minimum inner diameter _D3 ,
It is a device that measures the length P of the socket step in the pipe axial direction, the bolt hole pitch _D4 of the socket flange, etc. It is a device that rolls various measuring pipes T and transports them to a predetermined position on the front of the measuring device. and a carrying means 5 for positioning the socket end face to the measurement reference plane, and a maximum and minimum inner diameter D ₇ of the socket that moves in a direction perpendicular to the tube axis with respect to the measured value T.
Measuring tool 2 for D ₃ , measuring tool 3 for length P in the pipe axis direction of the socket step that moves parallel to the pipe axis, bolt hole pitch that is inserted into the socket flange bolt hole and moves perpendicular to the rotation axis. A measuring device 1 in which three measuring tools 4 each having a diameter D ₄ are arranged parallel to the tube axis direction, a transfer means that rolls the measuring tube T and repositions it to the next measuring position after each measurement is completed; By comprising a pulse scale that counts the amount of movement of each of the three measuring instruments 2, 3, and 4, and a means for issuing a warning when each dimension calculated from the counted amount exceeds a predetermined reference range. The above problem was solved. [Operation and Examples] FIG. 1 is an overall plan view showing an example of the present invention, and FIGS. 2 to 4 are plan views showing a single measuring tool. The operation of the present invention will be explained based on these drawings. The automatic dimension measuring device 1 shown in Fig. 1 includes a socket inner diameter measuring tool 2 (Fig.
(Fig. 4) and bolt hole pitch diameter measuring tool 4 (Fig. 4) are arranged in parallel, known means 5 for carrying in and positioning the cast iron pipe flowing in the direction perpendicular to this, and the measurement results are input to automatically determine pass/fail. It is connected to the electronic circuit 6 that makes the determination. The actual situation at the inspection site for cast iron pipes is that cast iron pipes with sockets of various diameters and shapes are brought in in an almost disorderly manner, which is unfavorable in terms of efficiency. This is due to the fact that the casting schedule at the casting site, which is a pre-inspection process, has to involve a mix of various pipe types. The cast iron pipes ordered from each municipality across the country come in a wide variety of completely unrelated pipe types due to their respective circumstances, and in order to meet their respective delivery deadlines, we have no choice but to create a production plan that mixes large and small pipes. That's because there isn't. Unless an optimal configuration for this purpose is constructed as a set of systems, it is not actually effective. First, loading and positioning are well known, but are essential requirements. Specifically, the cast iron pipe is usually loaded onto an electric trolley equipped with drive rollers, etc., and unloaded from the trolley at the loading position shown in Figure 1 to determine the position for measurement. This is also well known, but in general, in order to align the end face of the socket with a certain measurement line, it is often done to press the end face with an air cylinder or the like to position it on a certain line. Next, the measuring tube T is rolled horizontally from that position and transferred onto a pair of rollers in front of the socket inner diameter measuring tool, which is the first step of measurement. The rollers are a driving roller 51 and a driven roller 5 as shown in Fig. 1 in the movement range of the cast iron pipe.
2, and the intermediate line of the roller coincides with the center of the measuring tool in the moving direction. Here, the function of the socket inner diameter measuring tool 2 will be explained based on FIG. 2. When the measuring tube T is carried into the measuring device at a predetermined position as shown in the figure, the measuring tool 2 is moved to the right and the inner diameter measuring pin 7 is inserted into the socket of the measuring tube T. Next, the pneumatic cylinder 8A fixed to the inner diameter measuring pin 7 is activated to move the pin until it comes into contact with the inner wall of the socket (double-dashed line in the figure).
The movement stops at the time of contact, and the amount of movement is counted on the pulse scale 9A and input to the microcomputer 11 from the pulse counter 10. A pulse scale is an optical scale in which chromium is vapor-deposited on glass and etched to form graduations.This becomes the main scale, and when a scale of the same pitch is placed opposite the main scale and tilted at a certain angle, moiré fringes occur. It is based on the principle that a solar cell detects the brightness and darkness of these moire fringes and performs photoelectric conversion and measurement. After entering the personal computer from the counter, this value is stored in advance as a reference value (for example, the first
Table) to determine pass/fail. In this example, as shown in Figure 5, when the actual measurement value is A, upper limit B, and lower limit C, if C<A<B, it will be displayed and printed out, and if it deviates from this condition, the machine of the device will be stopped. At the same time, a warning is issued by outputting a signal to turn on the rotating light switch. Since the above is just one example, the measuring member is not limited to the measuring pin, but any form that moves and comes into contact with the inner surface of the receptacle can sufficiently achieve the purpose. In addition, the computer may issue a warning by turning on a rotating light or by sounding a warning buzzer, or simply stopping the device once will accomplish the purpose. It goes without saying that the pneumatic cylinder 8A can be replaced by hydraulic pressure. The measuring tube T that has passed the automatic measurement of the inner diameter of the socket is rolled to the next work station. In other words, a systemized series of rollers as shown in Figure 1 are installed in front of each measuring tool, and the cast iron pipes are sequentially rolled in the direction of the arrow in accordance with the measurement procedure. Accompanied by the device, the measurement flow of the cast iron pipe can proceed.
When placed at the position of the tube axial length measuring tool 3 shown in FIG. (dashed line), its movement distance is pulse scale 9B
It is counted and input to the personal computer 11 as before, and pass/fail judgment is automatically performed in the same manner. The flow sheet for the electronic circuit is almost the same as that in FIG. 4, so it will be omitted. FIG. 4 shows a bolt hole pitch diameter measuring tool, in which the entire measuring tool 4 moves forward (to the right in the figure) with respect to the measuring tube T carried into a predetermined position, and the bolt hole pitch measuring pin 13 moves forward (to the right in the figure) into the bolt hole H. Insert. Next, the pneumatic cylinder 8C is actuated to move the measuring pin 13 toward the center of the pitch circle (double-dashed line), and this amount of movement is counted on the pulse scale 9C and input to the personal computer 11, as before. Automatically determines whether the product passes or fails, and sends a warning for rejected products. In other words, one set of measuring equipment has to cope with the arrival of hundreds of pipes per day, and a mixture of cast iron pipes of various types. Positioning and rolling for each procedure are essential requirements, and the feature is that this and each measuring tool are combined into one set of systems. [Effects of the invention] Since the automatic measuring device according to the invention of the present application has the configuration and operation described above, it completely eliminates the manual work of conventional inspectors and automatically performs inspection judgments continuously. You will be freed from simple physical labor, improving work efficiency and eliminating physical and mental fatigue. What is even more important is that it eliminates variations in pass/fail judgments due to individual differences among inspectors, and directly leads to improved judgment accuracy through physical accuracy. In addition, as shown in Table 1 above, once the standard values and tolerances (upper and lower limits) for each part of the socket are stored in the computer as initial conditions for various types of cast iron pipes, subsequent Since the inspection only requires identifying the type of pipe, there is no need to store various inspection gauges or control their accuracy. As a unique effect of this embodiment, good products are printed out, and when a defective product is found, a revolving light is turned on to notify the manager immediately and the flow of the equipment is stopped, so there is no oversight and the quality control effect is improved. .

[Brief explanation of the drawing]

Fig. 1 is a plan view of the entire device, Fig. 2 is a plan view of the socket inner diameter measuring tool, Fig. 3 is a plan view of the socket pipe axial length measuring tool, and Fig. 4 is a bolt hole pitch diameter measuring tool. FIG. 5 is a flowchart for measuring the inner diameter of the socket in a personal computer, and FIG.
The figure is a plan view showing the socket measurement part. DESCRIPTION OF SYMBOLS 1... Automatic dimension measuring device, 2... Socket inner diameter measuring device, 3... Socket pipe axial length measuring device, 4... Bolt hole pitch diameter measuring device, 5... Cast iron pipe delivery positioning means, 6 ...Electronic circuit, 7, 12, 13... Measuring member (measuring pin), 8... Drive cylinder, 9...
Pulse scale, 10...Pulse counter, 1
1...Personal computer.

Claims (1)

[Scope of utility model registration request] The maximum inner diameter D ₇ , the minimum inner diameter D ₃ , the length P of the socket step in the pipe axis direction, and the socket flange bolts of cast iron pipes with bulged sockets that have standardized various pipe diameters and shapes. In a measuring device for measuring hole pitch _D4 , etc., there is provided a carrying means 5 for rolling and transporting various measuring tubes T to predetermined positions on the front surface of the measuring device and positioning the socket end face to a reference surface for measurement, Maximum and minimum inner diameter of the socket that moves in the direction perpendicular to the pipe axis relative to T
Measuring tool 2 for D ₇ and D ₃ , measuring tool 3 for length P in the pipe axis direction of the socket step that moves parallel to the pipe axis, inserts into the socket flange bolt hole and moves perpendicular to the rotation axis. A measuring device 1 has three measuring tools 4 with a bolt hole pitch diameter D ₄ arranged parallel to the tube axis direction, and a transfer device that rolls the measured value T and moves it to the next measuring position after each measurement is completed. means, a pulse scale for counting the amount of movement of each of the three measuring instruments 2, 3, and 4, and means for issuing a warning when each dimension calculated from the counted amount exceeds a predetermined reference range. An automatic dimension measuring device for cast iron pipe sockets.