CN109631795B - Elbow section ellipticity measuring device - Google Patents
Elbow section ellipticity measuring device Download PDFInfo
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- CN109631795B CN109631795B CN201910036807.3A CN201910036807A CN109631795B CN 109631795 B CN109631795 B CN 109631795B CN 201910036807 A CN201910036807 A CN 201910036807A CN 109631795 B CN109631795 B CN 109631795B
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- 239000000523 sample Substances 0.000 claims abstract description 27
- 230000007246 mechanism Effects 0.000 claims description 27
- 238000005452 bending Methods 0.000 claims description 17
- 238000003825 pressing Methods 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/255—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring radius of curvature
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention discloses an ellipticity measuring device for a cross section of a bent pipe, which comprises a base, a pipe ellipticity measuring module and a pipe positioning module. The pipe fitting ellipticity measuring module and the pipe fitting positioning module are mounted on the base, the pipe fitting positioning module is provided with the bent pipe, the pipe fitting ellipticity measuring module can rotate around the pipe fitting by 360 degrees, the scale shaft on the pipe fitting ellipticity measuring module can move up and down so as to drive the infrared probe to move up and down, the workpiece base on the pipe fitting positioning module can rotate, the cross section of the bent pipe of the pipe fitting on the pipe fitting positioning module can be adjusted to a horizontal position, and further the ellipticity of the cross section of the bent pipe can be measured rapidly.
Description
Technical Field
The invention relates to a pipe fitting measuring device, in particular to an ellipticity measuring device for a cross section of an elbow.
Background
The metal pipe fitting is bent and formed by determining reasonable supporting points and stress points and applying certain bending moment or bending force. In the bending forming process of the pipe fitting, the outer side of the bending deformation area is subjected to tangential tensile stress, and the pipe wall is thinned and even cracked; the inner side is subjected to tangential compressive stress, the pipe wall is thickened, and even the pipe wall is unstably wrinkled; the resultant force of the two produces compressive stress inwards in radial direction, so that the cross section is flattened and distorted, and even collapses. After unloading, the rebound phenomenon is generated due to residual stress in the bent pipe and elastic deformation recovery. Therefore, the problems of stretch cracking, wrinkling, section distortion, rebound and the like easily occur in the pipe bending and forming process, and the pipe bending and forming process is a complex forming process with multiple forming defects.
When the metal bent pipe is applied to different fields, the forming performance indexes such as wall thickness reduction rate, wall thickness thickening rate, fold degree, ellipticity, rebound accuracy and the like of the metal bent pipe have corresponding standards or requirements. After each metal pipe is bent and formed, the related forming performance index is measured. The appearance forming performance indexes such as the folding degree, the ovality, the rebound accuracy and the like can be measured by means of special equipment such as a 3D global coordinate measuring instrument, but the cost is high, and a special clamp is required to be designed. Manual positioning measurement can be adopted, but the precision is not high and the efficiency is low.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the bending section cross section ellipticity measuring device for the bent pipe, which has the advantages of high modularization degree, high measuring precision, simple operation, high modularization degree and high operating efficiency.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the device comprises a base, a pipe ovality measuring module and a pipe positioning module; the pipe ovality measuring device comprises a rotating base, a scale shaft bracket, a scale shaft and an infrared probe; the rotary base is mounted on the base through a thrust ball bearing, the rotary base is fixedly connected with two scale shaft brackets through a connecting piece, each scale shaft bracket is provided with a scale shaft capable of being adjusted up and down, the adjusting direction is the same as the axis direction of the thrust ball bearing, and the upper end of each scale shaft is provided with an infrared probe; the pipe fitting positioning module comprises a supporting shaft, a workpiece base, an angle display instrument for measuring the rotation angle of the workpiece base relative to the supporting shaft, a clamping mechanism and a clamping mechanism; the upper end of the supporting shaft is fixedly connected with the workpiece base through a clamping mechanism, and an angle display instrument is arranged on the clamping mechanism; the lower end of the supporting shaft penetrates through the through hole in the center of the rotating base and then is fixedly connected with the base, and an elbow is fixedly arranged on the upper surface of the workpiece base through a clamping mechanism.
The clamping mechanism comprises a pressing block, a stop block, a lead screw and a rotary handle; the workpiece base comprises a cylindrical block and a rectangular block connected with the middle of the bottom surface of the cylindrical block; the rectangular block is provided with a second bolt hole with a key groove, the upper surface of the cylindrical block of the workpiece base is at least provided with three rectangular sliding grooves uniformly distributed along the circumferential direction, the pressing block is slidably arranged in the rectangular sliding grooves and sleeved on a lead screw, the stop block is fixed in the rectangular sliding grooves, the lead screw is also supported and arranged on the stop block, and one end of the lead screw penetrating through the stop block is provided with a rotary handle;
the clamping mechanism comprises a round head bolt and a support shaft with a U-shaped groove at the upper end; rectangular blocks of the workpiece base are arranged in the U-shaped grooves of the supporting shafts; the two side wall surfaces of the U-shaped groove are provided with first key groove bolt holes; the round head bolt is fixedly connected with the round head bolt through a nut after being sequentially inserted into a first key groove-carrying bolt hole on the side wall of the U-shaped groove, a second key groove-carrying bolt hole on the rectangular block of the workpiece base and a first key groove-carrying bolt hole on the other side wall of the U-shaped groove.
The clamping mechanism further comprises a rectangular fastener, and a side wall shaft groove is formed in the side wall surface of the U-shaped groove; rectangular fasteners are arranged on the side wall shaft grooves.
The angle display instrument comprises a display, a pointer type resistor disc and a U-shaped resistor disc; the U-shaped resistor disc is adhered to the side wall of the U-shaped groove of the supporting shaft, one end of the pointer-shaped resistor disc is fixed on a round head bolt of the clamping mechanism, the other end of the pointer-shaped resistor disc is contacted with the U-shaped resistor disc, and the pointer-shaped resistor disc and the U-shaped resistor disc are respectively connected with the display through circuits.
The connecting piece comprises a long shaft and rectangular blocks, the long shaft penetrates through holes formed in two sides of the rotating base to be fixedly connected with the rotating base, two ends of the long shaft are fixedly connected with the rectangular blocks respectively, and the scale shaft support is fixed on the rectangular blocks.
The upper end surface of the workpiece base is carved with a base line for clamping the bent pipe along the radial direction, and before the bent pipe is clamped on the workpiece base, the bent pipe is firstly scribed by using a bent pipe center line scriber, and then is clamped with the base line 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 support realize circumferential positioning through keys.
The scale shaft support and the rectangular block realize circumferential positioning through keys.
The beneficial effects of the invention are as follows:
(1) The workpiece base can rotate around the supporting shaft in an angle mode, the rotating angle of the workpiece base can be displayed through the rotating angle measuring device, and therefore the rotating angle of the workpiece base can be adjusted, the section of the bent pipe with different bending angles clamped on the workpiece base can be rotated to the horizontal position, and the ovality at the section can be measured conveniently.
(2) The scale shaft 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 for displaying the mounting height of the infrared probe, so that the consistency of the heights of the probes on two sides is ensured, and the ellipticity of the cross section of the bending section of the bent pipe with different lengths can be measured.
(3) The cooperation of rotating base and back shaft belongs to clearance fit, so it can rotate around the back shaft to can drive the infrared probe of both sides and carry out 360 degrees rotations around the return bend that is surveyed, and then can accurately measure the biggest and minimum diameter of curved section cross section, calculate accurate ellipticity.
(4) A thrust ball bearing is arranged between the rotating base and the base, so that the friction resistance of the rotating base during rotation can be reduced.
(5) The invention adopts a modularized form, has convenient part replacement and strong universality.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an enlarged schematic view of the tubular measuring device of FIG. 1;
FIG. 3 is an enlarged schematic view of the infrared probe of FIG. 2;
FIG. 4 is an enlarged schematic view of the scale shaft bracket of FIG. 2;
FIG. 5 is an enlarged schematic view of the scale shaft of FIG. 2;
FIG. 6 is an enlarged perspective view of the pipe positioner of FIG. 1;
FIG. 7 is an enlarged schematic view of the pipe positioner of FIG. 1 in installed relationship with an angle display;
FIG. 8 is an enlarged view of the upper surface of the cylindrical block of the work piece base of FIG. 1;
FIG. 9 is an enlarged view of the connection between the cylindrical block and rectangular block of the work piece base of FIG. 1;
FIG. 10 is an enlarged schematic view of the stop of FIG. 6;
FIG. 11 is an enlarged schematic view of the lead screw of FIG. 6;
FIG. 12 is an enlarged schematic view of the rotary handle of FIG. 6;
FIG. 13 is an enlarged schematic view of the support shaft of FIG. 6;
FIG. 14 is an enlarged schematic view of the round head bolt of FIG. 6;
FIG. 15 is an enlarged schematic view of the rectangular fastener of FIG. 6;
FIG. 16 is an enlarged schematic view of the angle display of FIG. 7;
fig. 17 is an enlarged schematic view of the base of fig. 1.
Detailed Description
The objects and effects of the present invention will become more apparent from the following detailed description of the preferred embodiments and the accompanying drawings, in which the present invention is further described in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 17, the device for measuring ovality of a bent pipe section of the present embodiment comprises a base 1, a pipe ovality measuring module 2 and a pipe positioning module 3. The pipe ovality measuring module 2 comprises a rotary base 21, a scale shaft bracket 24, a scale shaft 25 and an infrared probe 26; the base 1 comprises a base 11, a bolt 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 edge of the base is provided with a first bolt hole 112; the upper surface of the base 11 is concentrically provided with a thrust ball bearing 13, the rotating base 21 is concentrically arranged on the thrust ball bearing 13, the rotating base 21 is fixedly connected with two scale shaft brackets 24 through a connecting piece, each scale shaft bracket 24 is provided with a scale shaft 25 which can be adjusted up and down, the adjusting direction is the same as the axial direction of the thrust ball bearing 13, and the upper end of the scale shaft 25 is provided with an infrared probe 26; the connecting piece comprises a long shaft 22 and rectangular blocks 23, the long shaft 22 penetrates through holes formed in two sides of the rotating base 21 to be fixedly connected with the rotating base 21, two ends of the long shaft 22 are fixedly connected with the rectangular blocks 23 respectively, and the scale shaft support 24 is fixed on the rectangular blocks 23.
The outer surface of the scale shaft 25 is marked with scales 251, the upper end of the scale shaft 25 is provided with a second blind hole 252 with key grooves, the lower end cylinder of the infrared probe 26 is provided with key grooves, and the key grooves at the lower end of the infrared probe 26 are used for installing keys and then are arranged on the second blind hole 252 with key grooves of the scale shaft 25; the infrared probe 26 is also connected to the computer by bluetooth, and transmits the measured data to the computer in real time. The inside of scale axle support 24 set up take keyway through-hole 241, the scale axle support 24 upper end outside be provided with third screw hole 242, scale axle 25 surface set up the keyway, the keyway of scale axle 25 surface be used for installing the key after pack into in the take keyway through-hole 241 of scale axle support 24 to compress tightly the location to scale axle 25 through screwing in set screw in third screw hole 242 department. The upper surface of the rectangular block 23 is provided with a first blind hole 232 with a key groove, the outer surface of the scale shaft support 24 is provided with a key groove, and the key groove on the outer surface of the scale shaft support 24 is used for installing a key and then is arranged in the first blind hole 232 with the key groove of the rectangular block 23. Two second long shaft through holes 231 are formed in the long side face of the rectangular block 23, second threaded holes 233 are formed in the short side face of the rectangular block, first long shaft through holes 211 are formed in the two sides of the rotary base 21, a first through hole 212 is formed in the middle of the rotary base, first threaded holes 213 are formed in the two sides of the rotary base 21, the long shaft 22 penetrates through the first long shaft through holes 211 of the rotary base 21, two ends of the long shaft 22 are respectively arranged in the second long shaft through holes 231 of the two rectangular blocks 23, and fastening screws are screwed into the second threaded holes 233 and the first threaded holes 213 to fasten the rectangular blocks 23 on the long shaft 22 and fasten the long shaft 22 in the rotary base 21. The infrared probe 26 can be connected with a computer through Bluetooth, and the measured data can be transmitted to the computer in real time.
The pipe fitting positioning module 3 comprises a supporting shaft 31, a workpiece base 34, an angle display 39 for measuring the rotation angle of the workpiece base 34 relative to the supporting shaft 31, a clamping mechanism and a clamping mechanism; the upper end of the supporting shaft 31 is fixedly connected with the workpiece base 34 through a clamping mechanism, and an angle display 39 is arranged on the clamping mechanism; the lower end of the supporting shaft 31 passes through the through hole in the center of the rotating base 21 and then is fixedly connected with the base 1, namely, the lower end of the supporting shaft 31 is inserted into the positioning device blind hole 111 of the base 11 through the first through hole 212 of the rotating base 21, and the bolts 12 are inserted into the first bolt holes 112 of the base 11 and the second bolt holes 311 of the supporting shaft 31 for positioning. The upper surface of the workpiece base (34) is fixedly provided with an elbow pipe 4 through a clamping mechanism.
The clamping mechanism comprises a pressing block 35, a stop block 36, a lead screw 37 and a rotary handle 38; the workpiece base 34 comprises a cylindrical block 40 and a rectangular block 41 connected with the middle of the bottom surface of the cylindrical block 40; the rectangular block 41 is provided with a second key slot bolt hole 344, the upper surface of the cylindrical block 40 of the workpiece base 34 is provided with at least three rectangular sliding grooves 341 which are uniformly distributed along the circumferential direction, the pressing block 35 is slidably arranged in the rectangular sliding grooves 341 and sleeved on the screw rod 37, the stop block 36 is fixed in the rectangular sliding grooves 341, the screw rod 37 is also supported and arranged on the stop block 36, and one end of the screw rod 37 penetrating through the stop block 36 is provided with a rotary handle 38; the end face of the inner end of the rectangular sliding groove 341 is provided with a blind hole 342, the blind hole 342 is used for installing a rolling bearing, the outer end of the bottom surface of the rectangular sliding groove 341 is provided with four fourth threaded holes 343, the pressing block 35 is provided with a fifth threaded hole 351, the stop block 36 is provided with a second through hole 361 with a larger front section diameter and a smaller rear section diameter for installing the rolling bearing, the bottom of the stop block 36 is provided with four sixth threaded holes 362, and the sixth threaded holes 362 on the stop block 36 and the fourth threaded holes 343 on the workpiece base 34 are concentric and are fixed by screwing screws at the positions. The screw rod 37 one end set up the keyway, screw rod 37 pass the fifth screw hole 351 of briquetting 35 and install antifriction bearing respectively at both ends, screw rod 37 have the one end of keyway pack into the blind hole 342 of work piece base 34, screw rod 37 have the one end of keyway pack into the second through-hole 361 of dog 36, twist grip 38 on set up the third blind hole 381 that takes the keyway, screw rod 37 have the one end of keyway pack into twist grip 38 and have set up the third blind hole 381 that takes the keyway after the installation key, realize the linkage of twist grip 38 and screw rod 37.
The clamping mechanism comprises a round head bolt 33 and a supporting shaft 31 with a U-shaped groove 312 at the upper end; the lower end of the supporting shaft 31 is cylindrical, the upper end of the supporting shaft is cuboid, a second bolt hole 311 is formed in the lower end of the supporting shaft, a U-shaped groove 312 is formed in the upper end of the supporting shaft, and a rectangular block 41 of the workpiece base 34 is arranged in the U-shaped groove 312 of the supporting shaft 31; the two side wall surfaces of the U-shaped groove 312 are provided with first key groove bolt holes 313; the round head bolt 33 is fixedly connected through nuts after being sequentially inserted into a first key-groove-carrying bolt hole 313 on the side wall of the U-shaped groove 312, a second key-groove-carrying bolt hole 344 on the rectangular block 41 of the workpiece base 34 and a first key-groove-carrying bolt hole 313 on the other side wall of the U-shaped groove 312, and a key groove is formed in the round head bolt 33 and is used for installing a key, so that the rectangular block at the lower end of the workpiece base 34 is fixedly connected with the round head bolt 33 through the key, and linkage between the round head bolt 33 and the workpiece base 34 is realized. The clamping mechanism further comprises a rectangular fastener 32, and a side wall shaft groove 314 is formed in the side wall surface of the U-shaped groove 312; the sidewall axle slots 314 are provided with rectangular fasteners 32. The round head side surface of the round head bolt 33 is provided with a pointer type resistor disc insertion hole 331, and the end surface is provided with a first wiring hole 332; the rectangular fastener 32 is provided with a bolt hole 321, the rectangular fastener 32 is arranged on the side wall shaft groove 314 of the supporting shaft 31, and a bolt is screwed into the bolt hole 321 of the rectangular fastener 32 and a nut is screwed for doubly fixing the workpiece base 34.
The angle display 39 includes a display 391, a pointer-type resistor 392 and a U-type resistor 393; the display 391 is internally provided with a power supply and a conversion circuit, the wall surface of the display 391 is provided with two second wiring holes 3911, and the display 391 is fixed on the cuboid side edge of the upper end of the supporting shaft 31 through screws; a third wiring hole 3931 is formed at one end of the U-shaped resistor disc 393; the U-shaped resistor 393 is adhered to the side wall of the U-shaped groove 312 of the supporting shaft 31, the small end of the pointer-shaped resistor 392 is tightly inserted into the pointer-shaped resistor insertion hole 331 of the round head bolt 33 on the clamping mechanism, the other end of the pointer-shaped resistor is contacted with the U-shaped resistor 393, and the pointer-shaped resistor 392 and the U-shaped resistor 393 are respectively connected with the display 391 through circuits. The two second connection holes 3911 of the display 391 are respectively connected with the third connection hole 3931 of the U-shaped resistor disc 393 and the first connection hole 332 on the end face of the round head bolt 33, and the change of the rotation angle of the workpiece base is represented by adjusting the electric signal through the internal conversion circuit of the display 391 and displaying the electric signal on the display due to the different resistances caused by different contact positions of the pointer-type resistor disc 392 and the U-shaped resistor disc 393. The display 391 may be, but is not limited to, a product of the model SP5-RSS of the deep blue company.
The upper end surface of the workpiece base 34 is carved with a base line 42 for clamping the bent pipe 4 along the radial direction, and before the bent pipe 4 is clamped on the workpiece base 34, the bent pipe is firstly scribed by using a bent pipe center line scriber, and then is clamped with the base line on the workpiece base 34.
During installation, the base 1 is firstly installed, the base 11 is horizontally fixed at a well found position, and the thrust ball bearing 13 is concentrically arranged on the base 11.
Next, the pipe fitting measuring device 2 is installed, the two long shafts 22 are first passed through the two first long shaft through holes 211 of the rotating base 21, then the two set screws are screwed into the first threaded holes 213 on both sides of the rotating base 21, then the two rectangular blocks 23 are inserted into both ends of the two long shafts 22 through the two second long shaft through holes 231 on the long sides thereof, and then the two set screws are screwed into the second threaded holes 233 on the short sides of the two rectangular blocks 23. Then, the two flat keys are respectively installed in the key grooves of the two scale shaft brackets 24, the two scale shaft brackets 24 are respectively inserted into the first key groove blind holes 232 of the two rectangular blocks 23, the flat keys are installed opposite to the key grooves, and the two set screws are respectively screwed into the second threaded holes 242 of the two scale shaft brackets 24. Next, two flat keys are respectively mounted in the key grooves of the two scale shafts 25, and then the two scale shafts 25 are respectively inserted into the first splined through holes 241 of the two scale shaft brackets 24, with the flat keys mounted opposite the key grooves. Finally, two flat keys are respectively installed in the key grooves of the lower end cylinder of the infrared probe 26, then the two infrared probes 26 are respectively inserted into the second blind holes 252 with key grooves on the scale shaft 25, the flat keys on the two infrared probes are installed opposite to the key grooves, and then the rotating base 21 is concentrically arranged on the thrust ball bearing 13.
Finally, the pipe fitting positioning device 3 is installed, three rolling bearings are respectively and tightly installed in three blind holes 342 of the workpiece base 34, then three screw rods 37 are respectively and tightly installed in three rectangular sliding grooves 341 of the workpiece base 34 through fifth threaded holes 351 of three pressing blocks 35, then all together, the non-splined end of each screw rod is inwards installed in the rolling bearings in the blind holes 342 of the workpiece base 34, then all three rolling bearings are respectively and tightly installed in second through holes 361 of three check blocks 36, then all three check blocks 36 are respectively and tightly installed in three rectangular sliding grooves 341 of the workpiece base 34 through rolling bearings on all three check blocks 36, then all screws are respectively screwed into sixth threaded holes 362 on the check blocks 36 and fourth threaded holes 343 of the workpiece base 34 to fix the check blocks 36, then all three flat keys are respectively installed in the key grooves of all three screw rods 37, and all three rotary handles 38 are respectively installed in the splined end of all three screw rods 37 through third splined blind holes 381 on all three screw rods 37, and all the flat keys are installed opposite to the flat keys. The rectangular fastener 32 is then installed onto the sidewall shaft groove 314 of the support shaft 31, the rectangular block at the lower end of the workpiece mount 34 is then placed into the U-shaped groove 312 of the support shaft 31, the second splined pin hole 344 thereon is concentric with the first splined pin hole 313 of the support shaft 31, the flat key is then installed into the keyway on the round head bolt 33, and then it is inserted into the first splined pin hole 313 of the support shaft 31 and the second splined pin hole 344 of the workpiece mount 34, and a nut is threaded onto the threaded end for securing the workpiece mount 34. Next, bolts are inserted into the bolt holes 321 of the rectangular fastener 32, and nuts are screwed to doubly fix the work piece base 34, then, the support shaft 31 is inserted into the positioning device blind holes 111 on the base 11 through the first through holes 212 of the swivel base 21 and the center holes of the thrust ball bearings 13, and the bolts 12 are inserted into the first bolt holes 112 of the base 1 and the second bolt holes 311 of the support shaft 31. Finally, the angle display 39 is mounted, the display 391 is fixed to the upper cuboid side of the support shaft 31 by screws, then the U-shaped resistor 393 is fixed to the upper cuboid side of the support shaft 31 by adhesion, and then the small end of the pointer-shaped resistor 392 is inserted into the pointer-shaped resistor insertion hole 331 of the round head bolt 33 in an interference manner, and the other end of the pointer-shaped resistor is contacted with the U-shaped resistor 393.
When in use, the set screw on the rectangular block 23 is screwed down to fix the rectangular block on the long shaft 22, then the infrared probe 26 is connected with the computer through Bluetooth, and the computer displays the distance between the two probes. Then the bent pipe 4 with the center line is vertically placed at the center position of the workpiece base 34, the center line on the bent pipe is aligned with the base line 42 on the workpiece base 34, and the position of the three pressing blocks 35 is adjusted by rotating the screw rod so as to clamp and fix the bent pipe 4. Then, two ends of the two wires are respectively inserted into the second wiring hole 411 of the display 41 and the third wiring hole 431 of the U-shaped resistor disc 43, and the second wiring hole 411 of the display 41 and the first wiring hole 332 on the end face of the round head bolt 33, the display 41, the pointer-type resistor disc 42 and the U-shaped resistor disc 43 are connected, then the rotation angle of the workpiece base 34 is manually adjusted through the bending angle of the bent pipe and the auxiliary adjustment is performed through the angle displayed by the display 41, so that the section of the bent pipe is adjusted to the horizontal position, then the nuts of the round head bolt 33 are screwed, and the nuts of the bolts on the rectangular fastener 32 are screwed to fix the workpiece base. Finally, the left and right positions of the long shaft 22 are manually adjusted so that the infrared probes 26 on two sides of the long shaft are approximately symmetrically distributed on the cross section of the bending section of the bent pipe 4, then the set screws on two sides of the rotary base 21 are screwed down to fix the long shaft 22, then the scale shaft 25 is manually adjusted so as to drive the infrared probes 26 on the scale shaft 25 to reach the position of the cross section of the bending section of the bent pipe, the set screws on the scale shaft bracket 24 are screwed down to fix the scale shaft 25, and then the 180-degree rotation measuring device 2 is rotated to measure the positionMaximum diameter of cross sectionAnd->And the data is fed back to the computer, and the ellipticity is calculated by the following ellipticity definition formula.
The ellipticity definition formula is:
=/>×100%
wherein,is ellipticity; />Maximum diameter for a cross-sectional circle; />Is the smallest diameter of the cross-sectional circle; />The original diameter of the cross-sectional circle before deformation.
The workpiece base can rotate around the supporting shaft in an angle mode and display the rotating angle through the rotating angle measuring device, and therefore the rotating angle of the workpiece base can be adjusted to enable the section of the bending section of the bent pipe with different bending angles clamped on the workpiece base to rotate to a horizontal position, and therefore ovality measurement is facilitated. The second scale shaft can be pressed and positioned by tightening the set screw on the hollow cylinder, and the outer surface of the scale shaft is provided with scales for displaying the mounting height of the infrared probe, so that the consistency of the heights of the probes on two sides is ensured, and the ellipticity of the cross section of the bending section of the bent pipe with different lengths can be measured. The third invention is matched with the supporting shaft in clearance fit, so that the third invention can rotate around the supporting shaft, thereby driving the infrared probes at two sides to rotate 180 degrees around the tested bent pipe, further accurately measuring the maximum and minimum diameters of the cross section of the bent section, and calculating the accurate ellipticity. The thrust ball bearing is arranged between the rotating base and the base, so that the friction resistance of the rotating base during rotation can be reduced. The fifth invention adopts a modularized form, so that the parts are convenient to replace, and the universality is strong.
Claims (6)
1. The device for measuring the ovality of the cross section of the bent pipe is characterized by comprising a base (1), a pipe ovality measuring module (2) and a pipe positioning module (3); the pipe ovality measuring module (2) comprises a rotating base (21), a scale shaft bracket (24), a scale shaft (25) and an infrared probe (26); the rotary base (21) is arranged on the base (1) through a thrust ball bearing (13), the rotary base (21) is fixedly connected with two scale shaft brackets (24) through a connecting piece, each scale shaft bracket (24) is provided with a scale shaft (25) which can be adjusted up and down, and the upper end of each scale shaft (25) is provided with an infrared probe (26); the pipe fitting positioning module (3) comprises a supporting shaft (31), a workpiece base (34), an angle display instrument (39) for measuring the rotation angle of the workpiece base (34) relative to the supporting shaft (31), a clamping mechanism and a clamping mechanism; the upper end of the supporting shaft (31) is fixedly connected with the workpiece base (34) through a clamping mechanism, and an angle display instrument (39) is arranged on the clamping mechanism; the lower end of the supporting shaft (31) penetrates through a through hole in the center of the rotary base (21) and then is fixedly connected with the base (1), and an elbow (4) is fixedly arranged on the upper surface of the workpiece base (34) through a clamping mechanism;
the clamping mechanism comprises a pressing block (35), a stop block (36), a lead screw (37) and a rotary handle (38); the workpiece base (34) comprises a cylindrical block (40) and a rectangular block (41) connected with the middle of the bottom surface of the cylindrical block (40); the rectangular block (41) is provided with a second bolt hole (344) with a key slot, at least three rectangular sliding grooves (341) uniformly distributed along the circumferential direction are formed in the upper surface of the cylindrical block (40) of the workpiece base (34), the pressing block (35) is slidably arranged in the rectangular sliding grooves (341) and sleeved on the screw rod (37), the stop block (36) is fixed in the rectangular sliding grooves (341), the screw rod (37) is also supported and arranged on the stop block (36), and one end of the screw rod (37) penetrating through the stop block (36) is provided with a rotary handle (38); the clamping mechanism comprises a round head bolt (33) and a supporting shaft (31) with a U-shaped groove (312) at the upper end; rectangular blocks (41) of the workpiece base (34) are arranged in the U-shaped grooves (312) of the supporting shafts (31); the two side wall surfaces of the U-shaped groove (312) are provided with first key groove bolt holes (313); the round head bolt (33) is fixedly connected through a nut after being sequentially inserted into a first key-groove-carrying bolt hole (313) on the side wall of the U-shaped groove (312), a second key-groove-carrying bolt hole (344) on a rectangular block (41) of the workpiece base (34) and the first key-groove-carrying bolt hole (313) on the other side wall of the U-shaped groove (312);
the clamping mechanism further comprises a rectangular fastener (32), and a side wall shaft groove (314) is formed in the side wall surface of the U-shaped groove (312); rectangular fasteners (32) are arranged on the side wall shaft grooves (314);
the angle display instrument (39) comprises a display (391), a pointer-type resistor disc (392) and a U-type resistor disc (393); the U-shaped resistor disc (393) is adhered to the side wall of the U-shaped groove (312) of the supporting shaft (31), one end of the pointer-shaped resistor disc (392) is fixed on the round head bolt (33) of the clamping mechanism, the other end of the pointer-shaped resistor disc is contacted with the U-shaped resistor disc (393), and the pointer-shaped resistor disc (392) and the U-shaped resistor disc (393) are respectively connected with the display (391) through circuits.
2. The device for measuring the ovality of the cross section of the bent pipe bending section according to claim 1, wherein the connecting piece comprises a long shaft (22) and rectangular blocks (23), the long shaft (22) penetrates through holes formed in two sides of the rotating base (21) to be fixedly connected with the rotating base (21), two ends of the long shaft (22) are fixedly connected with the rectangular blocks (23) respectively, and the scale shaft support (24) is fixed on the rectangular blocks (23).
3. The device for measuring the ovality of the cross section of the bent pipe according to claim 1, wherein the upper end surface of the workpiece base (34) is provided with a base line (42) for clamping the bent pipe (4) in a depicting way along the radial direction.
4. The device for measuring the ovality of the cross section of the bent pipe section according to claim 1, characterized in that the infrared probe (26) is also connected with a computer through Bluetooth.
5. The device for measuring the ovality of the cross section of the bent pipe section according to claim 1, wherein the scale shaft (25) and the scale shaft bracket (24) realize circumferential positioning through keys.
6. The device for measuring the ovality of the cross section of the bent pipe bending section according to claim 2, wherein the scale shaft bracket (24) and the rectangular block (23) are positioned in a circumferential direction through keys.
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| CN201910036807.3A CN109631795B (en) | 2019-01-15 | 2019-01-15 | Elbow section ellipticity measuring device |
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