CN109631795A - Elbow Measuring Device for Elbow Section - Google Patents

Abstract

The present invention discloses a kind of bend pipe ellipticity measuring device, including pedestal, pipe fitting ellipticity measurement module and pipe fitting locating module.The pipe fitting ellipticity measurement module and pipe fitting locating module is installed on pedestal, bend pipe is installed on the pipe fitting locating module, the pipe fitting ellipticity measurement module can 360 degree rotated around pipe fitting, and scale axis thereon can move up and down, to drive infrared probe to move up and down, workpiece pedestal on the pipe fitting locating module can be rotated, the bend pipe section of pipe fitting thereon is set to be adjusted to horizontal position, and then it can quickly measure the ovality in the bend pipe section, apparatus of the present invention modularization, it is versatile.

Description

Elbow Measuring Device for Elbow Section

technical field

The invention relates to a measuring device for pipe fittings, in particular to a measuring device for the ovality of a curved pipe section.

Background technique

Metal pipe fittings are bent and formed by determining a reasonable fulcrum and force point and applying a certain bending moment or bending force. During the bending and forming process of the pipe fitting, the outer side of the bending deformation zone is subjected to tangential tensile stress, and the pipe wall is thinned or even cracked; the inner side is subjected to tangential compressive stress, the pipe wall is thickened, or even wrinkled; The inward compressive stress causes the section to be flattened and distorted, or even collapsed. After unloading, due to the residual stress inside the elbow and the recovery of elastic deformation, a rebound phenomenon occurs. It can be seen that problems such as cracking, wrinkling, cross-section distortion and springback are prone to occur in the process of bending and forming of pipe fittings, which is a complex forming process with multiple forming defects.

When metal elbows are used in different fields, there are corresponding standards or requirements for their forming performance indicators, such as wall thickness reduction rate, wall thickness increase rate, wrinkle degree, ovality and springback accuracy. After each metal pipe is bent and formed, the relevant forming performance indicators must be measured. Among them, the shape forming performance indicators, such as wrinkle, ovality and springback accuracy, can be measured with special equipment such as 3D global coordinate measuring instrument, but the cost is high, and special fixtures need to be designed. Manual positioning measurement can also be used, but the accuracy is not high and the efficiency is low.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the present invention provides a device for measuring the section ovality of a curved section of a bent pipe with high modularity, high measurement accuracy, simple operation, high modularity and high operation efficiency.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

A device for measuring the ovality of elbow section, comprising a base, a tube fitting ovality measuring module and a tube fitting positioning module; the tube fitting ovality measuring device comprises a rotating base, a scale shaft bracket, a scale shaft and an infrared probe; wherein the rotating base It is installed on the base through a thrust ball bearing, and the rotating base is fixedly connected with two scale shaft brackets through a connecting piece. Each scale shaft bracket is installed with a scale shaft that can be adjusted up and down, and the adjustment direction is related to the thrust force. The axial direction of the ball bearing is the same, and an infrared probe is installed on the upper end of the scale shaft; the pipe fitting positioning module includes a support shaft, a workpiece base, an angle indicator for measuring the rotation angle of the workpiece base relative to the support shaft, and a clamping mechanism. and clamping mechanism; wherein the upper end of the support shaft and the workpiece base are fixedly connected by a clamping mechanism, and an angle indicator is installed on the clamping mechanism; After the hole is fixedly connected with the base, the upper surface of the workpiece base is fixedly installed with a curved pipe through a clamping mechanism.

The clamping mechanism includes a pressing block, a stopper, a lead screw and a rotating handle; the workpiece base includes a cylindrical block and a rectangular block connected in the middle with the bottom surface of the cylindrical block; the rectangular block is provided with a second belt Key slot pin hole, the upper surface of the cylindrical block of the workpiece base has at least three rectangular sliding grooves evenly distributed along the circumferential direction, and the pressing block is slidably installed in the rectangular sliding groove and sleeved on the lead screw, so The stopper is fixed in the rectangular chute, the lead screw is also supported and installed on the stopper, and a rotating handle is installed at one end of the lead screw passing through the stopper;

The clamping mechanism includes a round head bolt and a support shaft with a U-shaped groove on the upper end; a rectangular block of the workpiece base is installed in the U-shaped groove of the support shaft; A first keyed pin hole is provided; the round head bolt is inserted into the first keyed pin hole on the side wall of the U-shaped groove, the second keyed pin hole on the rectangular block of the workpiece base, and the other side wall of the U-shaped groove. After the first bolt hole with keyway is formed, it is fixedly connected by a nut, and the rectangular block at the lower end of the workpiece base and the round head bolt are fixedly connected by a key.

The clamping mechanism further comprises a rectangular fastener, and a side wall shaft groove is also opened on the side wall surface of the U-shaped groove; the rectangular fastener is installed on the side wall shaft groove.

The angle indicator includes a display, a pointer-type resistance sheet and a U-shaped resistance sheet; the U-shaped resistance sheet is adhered to the side wall of the U-shaped groove of the support shaft, and one end of the pointer-shaped resistance sheet is fixed on the clamp. On the round head bolt of the mechanism, the other end is in contact with the U-shaped resistance sheet, and the pointer-shaped resistance sheet and the U-shaped resistance sheet are respectively connected with the display through lines.

The connecting piece includes a long shaft and a rectangular block, the long shaft is fixedly connected to the rotating base through the through holes opened on both sides of the rotating base, and the two ends of the long shaft are respectively fixed to the rectangular block, and the The scale axis bracket is fixed on the rectangular block.

The upper end face of the workpiece base is delineated along the radial direction with the base line for clamping the bent pipe. Before the bent pipe is clamped on the workpiece base, it is firstly marked with the center line scriber of the bent pipe, and then And the base line clamping on the workpiece base.

The infrared probe is also connected with the computer through bluetooth, and the measured data is transmitted to the computer in real time.

The scale shaft and the scale shaft bracket are positioned in the circumferential direction through keys.

The circumferential positioning of the scale shaft bracket and the rectangular block is realized by keys.

The beneficial effects of the present invention are as follows:

(1) The workpiece base can be rotated angularly around the support shaft, and the angle of rotation can be displayed through the rotation angle measuring device, so that the rotation angle of the workpiece base can be adjusted to make the bends of different bending angles clamped on it. The curved section section is rotated to a horizontal position to facilitate the measurement of ovality at this section.

(2) The scale shaft can be pressed and positioned by tightening the set screw on the hollow cylinder. There is a scale on the outer surface of the scale shaft to display the installation height of the infrared probe. Measure the ovality of the cross section of the bend section of the bend of different lengths.

(3) The cooperation between the rotating base and the support shaft is a clearance fit, so it can rotate around the support shaft, so as to drive the infrared probes on both sides to rotate 360 degrees around the bent pipe under test, and then the bending section can be accurately measured The maximum and minimum diameters of the cross-sections are used to calculate the exact ovality.

(4) A thrust ball bearing is installed between the rotating base and the base, which can reduce the frictional resistance of the rotating base during rotation.

(5) The present invention adopts a modular form, the replacement of parts is convenient, and the versatility is strong.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the enlarged schematic diagram of the pipe fitting measuring device in Fig. 1;

Fig. 3 is the enlarged schematic diagram of the infrared probe in Fig. 2;

Fig. 4 is the enlarged schematic diagram of the scale shaft bracket in Fig. 2;

Fig. 5 is the enlarged schematic diagram of the scale axis in Fig. 2;

Fig. 6 is the enlarged perspective view of the pipe fitting positioning device in Fig. 1;

Fig. 7 is the enlarged schematic diagram of the installation relationship between the pipe fitting positioning device and the angle indicator in Fig. 1;

Figure 8 is an enlarged view of the upper surface of the cylindrical block of the workpiece base in Figure 1;

Enlarged view of the connection relationship between the cylindrical block and the rectangular block of the workpiece base in FIG. 9;

Figure 10 is an enlarged schematic view of the stop block in Figure 6;

Figure 11 is an enlarged schematic view of the lead screw in Figure 6;

Figure 12 is an enlarged schematic view of the rotary handle in Figure 6;

Figure 13 is an enlarged schematic view of the support shaft in Figure 6;

Fig. 14 is the enlarged schematic diagram of the round head bolt in Fig. 6;

Figure 15 is an enlarged schematic view of the rectangular fastener in Figure 6;

Fig. 16 is the enlarged schematic diagram of the angle indicator in Fig. 7;

FIG. 17 is an enlarged schematic view of the base in FIG. 1 .

Detailed ways

The present invention will be described in detail below according to the accompanying drawings and preferred embodiments, and the purpose and effects of the present invention will become clearer. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

As shown in FIG. 1-17 , the device for measuring the ovality of the elbow section in this embodiment includes a base 1 , a pipe fitting ovality measuring module 2 and a pipe fitting positioning module 3 . The pipe fitting ovality measurement module 2 includes a rotating base 21 , a scale shaft support 24 , a scale shaft 25 and an infrared probe 26 ; the base 1 includes a base 11 , a plug 12 and a thrust ball bearing 13 . The center of the base 11 is provided with a positioning device blind hole 111, and the side is provided with a first pin hole 112; the upper surface of the base 11 is concentrically mounted with a thrust ball bearing 13, and the rotating base 21 is concentrically mounted on the base 11. On the thrust bearing 13, the rotating base 21 is fixedly connected with two scale shaft brackets 24 through connecting pieces. Each scale shaft bracket 24 is provided with a scale shaft 25 that can be adjusted up and down, and the adjustment direction is related to the thrust ball. The axial direction of the bearing 13 is the same, and the infrared probe 26 is installed on the upper end of the scale shaft 25; It is fixedly connected with the rotating base 21 , and the two ends of the long shaft 22 are respectively fixedly connected with the rectangular block 23 , and the scale shaft bracket 24 is fixed on the rectangular block 23 .

The scale 251 is engraved on the outer surface of the scale shaft 25. The upper end of the scale shaft 25 is provided with a second blind hole 252 with a keyway. The lower end of the infrared probe 26 is provided with a keyway. The keyway at the lower end is used to install the key into the second blind hole 252 with keyway of the scale shaft 25; the infrared probe 26 is also connected to the computer through bluetooth, and the measured data is transmitted to the computer in real time. The inside of the scale shaft bracket 24 is provided with a through hole 241 with a keyway, the outer side of the upper end of the scale shaft bracket 24 is provided with a third threaded hole 242, and the outer surface of the scale shaft 25 is provided with a keyway. The keyway on the outer surface of the shaft 25 is used to install the key and then install it into the through-hole 241 with the keyway of the scale shaft bracket 24, and the scale shaft 25 is pressed and positioned by screwing the set screw at the third threaded hole 242. . The upper surface of the rectangular block 23 is provided with a first blind hole 232 with a keyway, the outer surface of the scale shaft bracket 24 is provided with a keyway, and the keyway on the outer surface of the scale shaft bracket 24 is used for installing the key and then loading in the first blind hole 232 with keyway of the rectangular block 23 . The long side of the rectangular block 23 is provided with two second long-axis through holes 231, the short side is provided with a second threaded hole 233, and the two sides of the rotating base 21 are provided with a first long axis The through hole 211 has a first through hole 212 in the middle and first threaded holes 213 on both sides. The long axis 22 passes through the first long axis through hole 211 of the rotating base 21. The ends are respectively installed into the second long axis through holes 231 of the two rectangular blocks 23, and the set screws are screwed into the second threaded holes 233 and the first threaded holes 213 to press and position the rectangular blocks 23 on the long axis 22. and the pressing position of the long axis 22 in the rotating base 21 . The infrared probe 26 can be connected to a computer through bluetooth, and the measured data can be transmitted to the computer in real time.

The pipe positioning module 3 includes a support shaft 31, a workpiece base 34, an angle indicator 39 for measuring the rotation angle of the workpiece base 34 relative to the support shaft 31, a clamping mechanism and a clamping mechanism; wherein the support shaft 31 The upper end and the workpiece base 34 are fixedly connected by a clamping mechanism, and an angle indicator 39 is installed on the clamping mechanism; That is, the lower end of the support shaft 31 is inserted into the blind hole 111 of the positioning device of the base 11 through the first through hole 212 of the rotating base 21, and is connected to the first pin hole 112 of the base 11 and the second hole of the support shaft 31. The pin 12 is inserted into the pin hole 311 for positioning. An elbow 4 is fixedly installed on the upper surface of the workpiece base (34) through a clamping mechanism.

The clamping mechanism includes a pressing block 35, a stopper 36, a lead screw 37 and a rotating handle 38; the workpiece base 34 includes a cylindrical block 40 and a rectangular block 41 connected to the middle of the bottom surface of the cylindrical block 40; the The rectangular block 41 is provided with a second pin hole 344 with a key slot, the upper surface of the cylindrical block 40 of the workpiece base 34 is provided with at least three rectangular sliding grooves 341 evenly distributed along the circumferential direction, and the pressing block 35 is slidably installed In the rectangular chute 341 and sleeved on the lead screw 37, the stopper 36 is fixed in the rectangular chute 341, the lead screw 37 is also supported and installed on the stopper 36, and the lead screw 37 is installed with a rotary handle 38 through one end of the stopper 36; wherein the inner end face of the rectangular chute 341 is provided with a blind hole 342, the blind hole 342 is used to install the rolling bearing, and the outer end of the bottom surface of the rectangular chute 341 There are four fourth threaded holes 343, the pressure block 35 is provided with a fifth threaded hole 351, and the stopper 36 is provided with a second through hole 361 with a larger diameter in the front section and a smaller diameter in the rear section. For installing the rolling bearing, four sixth threaded holes 362 are formed at the bottom of the stopper 36. The sixth threaded holes 362 on the stopper 36 and the fourth threaded hole 343 on the workpiece base 34 are concentric and pass through here. Screw in the screw to fix it. One end of the lead screw 37 is provided with a keyway, the lead screw 37 passes through the fifth threaded hole 351 of the pressing block 35 and is respectively installed with rolling bearings at both ends, and the end of the lead screw 37 without the keyway is loaded into the workpiece base In the blind hole 342 of 34, the end of the lead screw 37 with the keyway is inserted into the second through hole 361 of the stopper 36, and the rotary handle 38 is provided with a third blind hole 381 with a keyway. The lead screw 37 has a keyway at one end and the key is installed at one end and then loaded into the rotary handle 38 .

The clamping mechanism includes a round head bolt 33 and a support shaft 31 with a U-shaped groove 312 at the upper end; wherein the support shaft 31 is cylindrical at the lower end, cuboid at the upper end, and has a second cylindrical opening on the lower end. The latch hole 311 has a U-shaped groove 312 on the upper cuboid, and the rectangular block 41 of the workpiece base 34 is installed in the U-shaped groove 312 of the support shaft 31; the two side walls of the U-shaped groove 312 are A first keyed pin hole 313 is provided; the round head bolt 33 is inserted into the first keyed pin hole 313 on the side wall of the U-shaped groove 312, the second keyed pin hole 344 on the rectangular block 41 of the workpiece base 34, and After the first key-slot pin hole 313 on the other side wall of the U-shaped groove 312, it is fixedly connected by a nut. The round head bolt 33 has a key slot for installing the key, so that the rectangular block at the lower end of the workpiece base 34 is connected to the The round head bolts 33 are fixedly connected by keys to realize the linkage between the round head bolts 33 and the workpiece base 34 . The clamping mechanism further includes a rectangular fastener 32, and a side wall shaft groove 314 is also opened on the side wall surface of the U-shaped groove 312; the rectangular fastener 32 is installed on the side wall shaft groove 314 . The round head bolt 33 has a pointer-type resistance chip insertion hole 331 on the side of the round head, and a first wiring hole 332 is opened on the end face; the rectangular fastener 32 has a bolt hole 321, and the rectangular fastening The fastener 32 is installed on the side wall shaft groove 314 of the support shaft 31 , the bolts are screwed into the bolt holes 321 of the rectangular fastener 32 and the nuts are screwed to double fix the workpiece base 34 .

The angle indicator 39 includes a display 391, a pointer-type resistance sheet 392 and a U-shaped resistance sheet 393; the display 391 has a power supply and a conversion circuit inside, and the wall of the display 391 is provided with two second wiring holes 3911, the display 391 is fixed on the cuboid-shaped side of the upper end of the support shaft 31 by screws; the U-shaped resistor sheet 393 is provided with a third wiring hole 3931 at one end; the U-shaped resistor sheet 393 is bonded to the support On the side wall of the U-shaped groove 312 of the shaft 31, the small end of the pointer-type resistance sheet 392 is inserted into the pointer-shaped resistance sheet insertion hole 331 of the round head bolt 33 on the clamping mechanism, and the other end is connected to the U-shaped resistance sheet. 393 are in contact with each other, and the pointer-shaped resistance sheet 392 and the U-shaped resistance sheet 393 are respectively connected with the display 391 through lines. The two second wiring holes 3911 of the display 391 are respectively connected with the third wiring hole 3931 of the U-shaped resistor sheet 393 and the first wiring hole 332 on the end face of the round head bolt 33, and can pass through the pointer-shaped resistor sheet 392 and the U-shaped resistor sheet 392. The contact position of the type resistance sheet 393 is different, causing the resistance to be different and causing the change of the current. Then, the electrical signal is adjusted by the internal conversion circuit of the display 391 and displayed on the display to indicate the change of the rotation angle of the workpiece base. The display 391 can be a product of Deep Blue company SP5-RSS, but is not limited thereto.

The upper end surface of the workpiece base 34 is engraved with the base line 42 for clamping the elbow 4 along the radial direction. Scribing is performed, and then the line is clamped with the baseline on the workpiece base 34 .

When installing, first install the base 1 , find a position to fix the base 11 horizontally, and place the thrust ball bearing 13 on the base 11 concentrically.

Next, install the pipe fitting measuring device 2, first pass the two long shafts 22 through the two first long shaft through holes 211 of the rotating base 21, and then screw the two set screws into the first long shafts 211 on both sides of the rotating base 21 respectively. In the threaded holes 213, then insert the two rectangular blocks 23 into the two ends of the two long shafts 22 through the two second long shaft through holes 231 on the long sides, respectively, and then screw the two set screws into the two in the second threaded hole 233 on the short side of the rectangular block 23 . Next, install the two flat keys into the key grooves of the two scale shaft brackets 24 respectively, and then insert the two scale shaft brackets 24 into the first blind holes 232 with key grooves of the two rectangular blocks 23 respectively. Then, screw the two set screws into the second threaded holes 242 of the two scale shaft brackets 24 respectively. Next, install the two flat keys into the key grooves of the two scale shafts 25 respectively, and then insert the two scale shafts 25 into the first through holes 241 with key grooves of the two scale shaft brackets 24 respectively. Install with keyway. Finally, install the two flat keys into the keyway of the cylinder at the lower end of the infrared probe 26, respectively, and then insert the two infrared probes 26 into the second blind hole 252 with keyway on the scale shaft 25 respectively, and the flat keys on it are opposite to each other. The keyway is installed, and then the rotating base 21 is placed on the thrust ball bearing 13 concentrically.

Finally, install the pipe fitting positioning device 3 , firstly insert the three rolling bearings into the three blind holes 342 of the workpiece base 34 by interference, and then pass the three lead screws 37 through the fifth threaded holes 351 of the three pressing blocks 35 respectively. , and then put them into the three rectangular slide grooves 341 of the workpiece base 34 together, the end of the lead screw without the keyway is installed into the rolling bearing in the blind hole 342 of the workpiece base 34, and then the three rolling bearings are respectively inserted into the interference In the second through hole 361 of the three stoppers 36, then put the three stoppers 36 through the end of the three lead screws 37 with the keyway through the rolling bearings on them, and put them into the three rectangular chutes of the workpiece base 34. In 341, then screw the screws into the sixth threaded hole 362 on the stopper 36 and the fourth threaded hole 343 of the workpiece base 34 to fix the stopper 36, and then install the three flat keys to the three screws 37 respectively. In the keyway, then the three rotary handles 38 are respectively inserted into the keyway end of the three lead screws 37 through the third blind hole 381 with keyway, and the keyway on the keyway is installed opposite to the flat key. Next, install the rectangular fastener 32 on the side wall shaft groove 314 of the support shaft 31 , and then put the rectangular block at the lower end of the workpiece base 34 into the U-shaped groove 312 of the support shaft 31 , and the second key slot on it has a latch hole. 344 is concentric with the first key slot 313 of the support shaft 31, then install the flat key into the key slot on the round head bolt 33, and then insert it into the first key slot 313 of the support shaft 31 and the workpiece base 34. A nut is screwed on the threaded end to fix the workpiece base 34 in the second key slotted pin hole 344 . Next, insert the bolt into the bolt hole 321 of the rectangular fastener 32, and screw on the nut to double fix the workpiece base 34, and then pass the support shaft 31 through the first through hole 212 of the rotating base 21 and the center hole of the thrust ball bearing 13 Insert into the blind hole 111 of the positioning device on the base 11 , and insert the latch 12 into the first latch hole 112 of the base 1 and the second latch hole 311 of the support shaft 31 . Finally, to install the angle indicator 39, first fix the display 391 to the side of the upper end of the support shaft 31 by screws, then fix the U-shaped resistor sheet 393 to the side of the upper end of the support shaft 31 by bonding, and then The small end of the pointer-type resistance piece 392 is inserted into the pointer-type resistance piece insertion hole 331 of the round head bolt 33 with interference, and the other end is in contact with the U-shaped resistance piece 393 .

When in use, firstly tighten the set screw on the rectangular block 23 to fix it on the long axis 22, and then connect the infrared probe 26 to the computer via Bluetooth, and the computer will display the distance between the two probes. Then put the elbow 4 with the center line on it vertically at the center of the workpiece base 34, the center line on it is aligned with the baseline 42 on the workpiece base 34, and rotate the screw to adjust the position of the three pressure blocks 35 to Clamp and fix the elbow 4. Next, insert the two wires into the second wiring hole 411 of the display 41 , the third wiring hole 431 of the U-shaped resistor sheet 43 , the second wiring hole 411 of the display 41 and the first wiring hole on the end surface of the round head bolt 33 , respectively. 332, connect the display 41, the pointer-type resistance sheet 42 and the U-shaped resistance sheet 43, and then manually adjust the rotation angle of the workpiece base 34 through the bending angle of the elbow and assist the adjustment through the angle displayed by the display 41, so that the Adjust the cross section of the curved section of the elbow to the horizontal position, then tighten the nut of the round head bolt 33 and the nut of the bolt on the rectangular fastener 32 to fix the workpiece base. Finally, manually adjust the left and right positions of the long axis 22 so that the infrared probes 26 on both sides are roughly symmetrically distributed on the curved section of the elbow 4, and then tighten the set screws on both sides of the rotating base 21 to fix the long axis 22, and then Manually adjust the scale shaft 25 to drive the infrared probe 26 on it to reach the position of the curved section of the elbow, tighten the set screw on the scale shaft bracket 24 to fix the scale shaft 25, and then rotate the measuring device 2 180 degrees to measure here maximum diameter of cross section and , and feed the data back to the computer, and calculate its ellipticity through the following ellipticity definition formula.

The formula for defining ovality is:

= ×100%

in, is the ellipticity; is the maximum diameter of the section circle; is the minimum diameter of the section circle; is the original diameter of the section circle before deformation occurs.

In this embodiment, the workpiece base can be angularly rotated around the support shaft, and the rotation angle can be displayed by the rotation angle measuring device, so that the rotation angle of the workpiece base can be adjusted to clamp the curved sections of the bends with different bending angles on it. The section is rotated to a horizontal position to facilitate the measurement of ovality here. Second, the scale shaft of the present invention can be pressed and positioned by tightening the set screw on the hollow cylinder, and scales are arranged on the outer surface of the scale shaft to display the installation height of the infrared probe, and at the same time, it is beneficial to ensure that the heights of the probes on both sides are consistent so that The ovality of the cross section of the bend section of the elbow of different lengths can be measured. Third, the matching between the rotating base and the supporting shaft of the present invention is a clearance fit, so it can rotate around the supporting shaft, so that the infrared probes on both sides can be driven to rotate 180 degrees around the bent pipe to be measured, and then the bending can be accurately measured. The maximum and minimum diameters of the segment cross-sections are used to calculate the exact ovality. Fourth, a thrust ball bearing is installed between the rotating base and the base of the present invention, so that the frictional resistance of the rotating base during rotation can be reduced. Fifth, the present invention adopts a modular form, the replacement of parts is convenient, and the versatility is strong.

Claims (9)

1. A device for measuring the section ovality of a curved section of a bent pipe, characterized in that it comprises a base (1), a pipe fitting ovality measuring module (2) and a pipe fitting positioning module (3); the pipe fitting ovality measuring module (2) ) comprises a rotating base (21), a scale shaft bracket (24), a scale shaft (25) and an infrared probe (26); wherein the rotating base (21) is mounted on the base (1) through a thrust ball bearing (13) , the rotating base (21) is fixedly connected with two scale shaft brackets (24) through connectors, and each of the scale shaft brackets (24) is installed with a scale shaft (25) that can be adjusted up and down, so An infrared probe (26) is installed on the upper end of the scale shaft (25); the pipe fitting positioning module (3) includes a support shaft (31), a workpiece base (34), and is used to measure the relative relationship of the workpiece base (34) to the support shaft (31). 31) The angle indicator (39) of the rotation angle, the clamping mechanism and the clamping mechanism; wherein the upper end of the support shaft (31) and the workpiece base (34) are fixedly connected by a clamping mechanism, and the clamping mechanism An angle indicator (39) is installed on the tightening mechanism; the lower end of the support shaft (31) passes through the through hole in the center of the rotating base (21) and is fixedly connected to the base (1), and the workpiece base (34) An elbow (4) is fixedly installed on the upper surface of the duct through a clamping mechanism. 2. A device for measuring the ovality of a curved section of a bent pipe according to claim 1, wherein the clamping mechanism comprises a pressing block (35), a stopper (36), a lead screw (37) and a rotating a handle (38); the workpiece base (34) includes a cylindrical block (40) and a rectangular block (41) connected to the middle of the bottom surface of the cylindrical block (40); the rectangular block (41) is provided with a third Two keyed pin holes (344), the upper surface of the cylindrical block (40) of the workpiece base (34) is provided with at least three rectangular sliding grooves (341) evenly distributed along the circumferential direction, and the pressing block (35) ) is slidably installed in the rectangular chute (341) and sleeved on the lead screw (37), the stopper (36) is fixed in the rectangular chute (341), and the lead screw (37) also supports is installed on the block (36), and a rotating handle (38) is installed at one end of the lead screw (37) passing through the block (36); The clamping mechanism comprises a round head bolt (33), a support shaft (31) with a U-shaped groove (312) at the upper end; a workpiece base (312) is installed in the U-shaped groove (312) of the support shaft (31). 34) of the rectangular block (41); the two side walls of the U-shaped groove (312) are provided with first key-slot pin holes (313); the round head bolts (33) are inserted into the U-shaped groove in sequence (312) The first keyed pin hole (313) on the side wall, the second keyed pin hole (344) on the rectangular block (41) of the workpiece base (34), and the second pin hole (344) on the other side wall of the U-shaped groove (312) With a key slot pin hole (313), it is fixed with a nut. 3. A device for measuring the ovality of a curved pipe section according to claim 2, wherein the clamping mechanism further comprises a rectangular fastener (32), and the side of the U-shaped groove (312) A side wall shaft groove (314) is also opened on the wall surface; a rectangular fastener (32) is installed on the side wall shaft groove (314). 4. A device for measuring the ovality of an elbow section according to claim 1, wherein the angle indicator (39) comprises a display (391), a pointer-type resistance sheet (392) and a U-shaped resistance sheet (393); the U-shaped resistor sheet (393) is adhered to the side wall of the U-shaped groove (312) of the support shaft (31), and one end of the pointer-shaped resistor sheet (392) is fixed on the circle of the clamping mechanism On the head bolt (33), the other end is in contact with the U-shaped resistor sheet (393), and the pointer-shaped resistor sheet (392) and the U-shaped resistor sheet (393) are respectively connected to the display (391) through lines. 5. A device for measuring the ovality of a curved pipe section according to claim 1, wherein the connecting piece comprises a long axis (22) and a rectangular block (23), and the long axis (22) passes through The through holes opened on both sides of the rotating base (21) are fixedly connected to the rotating base (21), and the two ends of the long axis (22) are respectively fixed to the rectangular block (23), and the scale axis bracket (24) Fixed on the rectangular block (23). 6. A device for measuring the ovality of a pipe bend section according to claim 1, wherein the upper end face of the workpiece base (34) is delineated with a base line ( 42). 7 . The device for measuring the ovality of a curved pipe section according to claim 1 , wherein the infrared probe ( 26 ) is also connected to a computer through Bluetooth. 8 . 8 . The device for measuring the ovality of a curved pipe section according to claim 1 , wherein the scale shaft ( 25 ) and the scale shaft bracket ( 24 ) are positioned in a circumferential direction through a key. 9 . 9 . The device for measuring the ovality of elbow section according to claim 5 , characterized in that the circumferential positioning of the scale shaft bracket ( 24 ) and the rectangular block ( 23 ) is realized by keys. 10 .