CN217179494U

CN217179494U - Bending angle measuring device

Info

Publication number: CN217179494U
Application number: CN202220619950.2U
Authority: CN
Inventors: 解胜飞; 彭明龙; 解伟
Original assignee: WUXI HUAGUANG INDUSTRIAL BOILER CO LTD
Current assignee: WUXI HUAGUANG INDUSTRIAL BOILER CO LTD
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-08-12
Anticipated expiration: 2032-03-21

Abstract

The utility model belongs to the technical field of the bending angle check out test set of circular cross-section work piece, a bending angle measuring device is related to, including the main scale, slide on the main scale and set up the main foot, rotate at main scale one end simultaneously and connect vice chi, be equipped with first slip locking part between main scale and the main foot to locking the location to the position of main foot on the main scale, be equipped with between main scale and the vice chi and prevent changeing locking mechanism, slide on the vice chi and set up vice foot, be equipped with second slip locking mechanism between vice chi and the vice foot, be equipped with length scale and angle scale on the main scale, install the radius vernier on the main foot, install the angle vernier on the vice chi, the main foot cooperatees with vice foot and fixes a position the work piece. The measuring device can be well used for accurately measuring the bending angle of a workpiece with a circular section with the bending angle of 0-180 degrees after being bent.

Description

Bending angle measuring device

Technical Field

The utility model belongs to the technical field of the bending angle check out test set of circular cross-section work piece, a bending angle measuring device is related to.

Background

The boiler is used as a common pressurized device and widely applied to heat supply, gas supply and heating projects, convection heating surfaces of the boiler such as convection pipes, water pipe systems, economizers, superheaters, reheaters and the like usually adopt a bent pipe structure, in order to fully and effectively ensure the heating area of the pipes, bent pipes are required to be arranged in a limited space as much as possible to be washed by high-temperature flue gas, the bending radii of the pipes are various, particularly the bending radii of R35-R300 and the bending angles of phi 32-phi 60 pipe diameters are more than 0-180 degrees, according to the requirements of a boiler specification, the distance from a pipe end to a pipe bending starting point is at least 50mm, the pipe pipelines are required to be flush in inner surface when being butted, and certain cross section shape distortion can be generated at the pipe bending part when bending small radii. Therefore, during the production of the bent pipe, not only the distortion of the bent part needs to be strictly controlled, but also the angle after bending deformation needs to be strictly controlled, so as to ensure the position of the bent pipe end and meet the accuracy and the conformity of the subsequent bent pipe assembling and connecting.

At present, the effective method for measuring the bent pipe is a lofting method and measurement by adopting a special angle measuring ruler, wherein the lofting method is to mark a 1:1 central line and an appearance outline projection plane marking mark according to each different bending radius and bending angle of a bent pipe workpiece on a lofting platform, compare the lofted workpieces, and correct or re-bend the bent workpieces after the out-of-tolerance is found. The special angle ruler is designed and manufactured according to the bending contour (and the inner diameter) of the inner surface of each bent pipe workpiece, the bending starting angle ruler and the movable angle ruler are designed for measurement, the special angle ruler required by production can be used after the measurement is qualified by design and manufacture according to each different bending inner diameter of the bent pipe workpiece, the special angle ruler has huge specification and quantity, the smaller the bending inner diameter is, the closer the scale mark on the disc surface is, and the poorer the measurement precision is; after the bent pipe workpiece is bent, a certain amount of distortion deviation allowed by a manufacturing standard exists, and a certain amount of nonstandard conditions also exist on the bent inner surface, so that the arc shape of the special angle measuring ruler needs to be corrected, the measurement precision of the special angle measuring ruler can be influenced, and the angle detection accuracy of the bent pipe workpiece is greatly influenced; the large number of specifications of the special angle ruler and the large adoption of bent pipe workpieces in boiler parts cause the workload of maintenance, abrasion, duplication and measurement of the subsequent angle ruler to be huge.

Disclosure of Invention

The utility model provides a to above-mentioned problem, provide a bending angle measuring device, this measuring device can be used for bending angle 0-180 round section work piece bending back bending angle accurate measurement well.

According to the technical scheme of the utility model: a bending angle measuring apparatus characterized in that: including the main scale, slide on the main scale and set up the main foot, rotate in main scale one end simultaneously and connect vice chi, be equipped with first slip locking part between main scale and the main foot to locking the location to the position of main foot on the main scale, be equipped with between main scale and the vice chi and prevent changeing locking mechanism, slide on the vice chi and set up vice foot, be equipped with second slip locking mechanism between vice chi and the vice foot, be equipped with length scale and angle scale on the main scale, install the radius vernier on the main foot, install the angle vernier on the vice chi, the main foot cooperatees with vice foot in order to fix a position the work piece.

As a further improvement of the utility model, the upper plane of the main ruler is provided with length scales and angle scales, the radius vernier is matched to measure the bending radius of the workpiece, and the angle vernier is matched to measure the bending angle of the workpiece;

the upper edge of the main scale is superposed with the connecting line of the 0-degree scale mark and the 180-degree scale mark of the angle scale and is simultaneously superposed with the workpiece initial curve line of the workpiece;

the main ruler is provided with a main ruler long sliding slot hole, and the long central line of the main ruler long sliding slot hole is parallel to the upper edge of the main ruler;

the center of the angle scale reference circle coincides with the workpiece bending center of the workpiece, and a center round hole is formed in the center of the angle scale reference circle and is connected with the auxiliary ruler through an anti-rotation locking mechanism; the anti-rotation locking mechanism comprises an anti-rotation nut and an anti-rotation screw; the distance S that the 0-position reference scale line of the length scale deviates from the reference center line is equal to the distance between the 0-position reference scale line of the radius cursor and the center line of the radius cursor.

As a further improvement of the present invention, the bottom of the main leg is provided with a main leg V-shaped groove, the main leg V-shaped groove is symmetrical left and right with respect to a main leg reference central line, the main leg reference central line is perpendicular to the upper side of the main ruler so as to be positioned according to the outer circumference of the front section of the workpiece bending start, and the starting end of the main leg V-shaped groove deviates from the workpiece bending start line by a distance so as to avoid a local deformation area of the workpiece bending start part;

the top surface of the main foot is provided with a first main foot screw hole, the upper part of the main foot is provided with an L-shaped opening sliding chute, the bottom of the L-shaped opening sliding chute is provided with a second main foot screw hole, the first main foot screw hole of the main foot is connected with the radius vernier through a first screw, and the main foot and the radius vernier form a right opening sliding chute;

the first sliding locking mechanism comprises a radius adjusting screw, a main ruler is installed in the right opening sliding chute, and the radius adjusting screw penetrates through a main ruler long sliding groove hole of the main ruler and is installed in a main foot second screw hole so as to realize that the main foot and the radius vernier slide and lock in the main ruler long sliding groove hole;

a main ruler inlaid strip is inlaid on the inner side of the L-shaped opening sliding groove of the main foot to adjust a sliding gap; the main foot is provided with two main foot calibration semicircular grooves, and the main foot calibration semicircular grooves are matched with the auxiliary foot calibration semicircular bulges of the auxiliary feet so as to set and calibrate the same bending radius value of the main ruler and the auxiliary ruler.

As a further improvement of the utility model, the radius vernier is provided with a radius observation hole and a radius cursor marking line surface, 20 scribed lines are equally divided on the radius cursor marking line surface according to 19mm, and the positioning precision is 0.05 mm;

the radius vernier reticle faces the length scale on the main scale and inclines so as to be convenient for alignment reading between the reticles and display the bending radius value of the workpiece at the position of the main foot; the central line of the radius vernier coincides with the central line of the main foot reference and the central line of the bending front section of the measured workpiece.

As a further improvement of the utility model, the auxiliary ruler adopts a round head strip structure, a round hole is arranged at the round head end of the auxiliary ruler, the auxiliary ruler is connected with the main ruler through an anti-rotation locking mechanism, the center of the round hole of the auxiliary ruler coincides with the angle scale reference circle center of the main ruler and coincides with the bending center of a workpiece, so that the auxiliary ruler can be tightly attached to the lower surface of the main ruler to rotate and lock, and the included angle state between the auxiliary ruler and the main ruler is kept;

the auxiliary ruler is provided with an upper side of the auxiliary ruler, and an extension line of the upper side of the auxiliary ruler passes through the center of the circular hole of the auxiliary ruler; the upper long edge and the lower long edge of the auxiliary ruler are provided with auxiliary feet in a sliding mode through dovetail groove structures, an auxiliary ruler long sliding groove hole is formed in the position, close to the upper edge of the auxiliary ruler, the auxiliary ruler long sliding groove hole is of a countersunk head sliding groove hole structure, the long central line of the auxiliary ruler long sliding groove hole is parallel to the upper edge of the auxiliary ruler, and a second sliding locking structure is arranged in the countersunk head sliding groove hole and connected with the auxiliary ruler;

the second sliding locking mechanism comprises a nut and a countersunk screw, the head of the countersunk screw is matched with the countersunk sliding groove hole, the top end of the head of the countersunk screw is not exposed out of the surface of the auxiliary ruler, and the lower end of the countersunk screw is not exposed out of the bottom surface of the V-shaped groove of the auxiliary foot after the countersunk screw is fastened with the nut.

As a further improvement of the present invention, the auxiliary foot bottom is provided with an auxiliary foot V-shaped groove, the auxiliary foot V-shaped groove is bilaterally symmetrical about an auxiliary foot reference central line, the auxiliary foot reference central line is perpendicular to the upper side of the auxiliary ruler, the auxiliary foot reference central line coincides with the central line of the bending rear section of the workpiece to be measured, so as to position the outer circumference of the bending rear section according to the workpiece, and the starting end of the auxiliary foot V-shaped groove deviates from the final bending line of the workpiece by a distance to avoid a local deformation region of the final bending part of the workpiece;

the top of the auxiliary foot is provided with a dovetail sliding groove structure for mounting an auxiliary ruler, and an auxiliary ruler inlaid strip is inlaid in the dovetail sliding groove structure to adjust a sliding gap; two auxiliary foot calibration semicircular bulges are arranged on the auxiliary foot.

As a further improvement of the utility model, the angle vernier is of an L-shaped structure, the straight edges at two sides of the angle vernier are level to the upper and lower long edges of the auxiliary ruler, and a second screw is installed to be assembled and fastened with the auxiliary ruler to form a U-shaped groove structure and is arranged at the periphery of the angle dial disc of the main ruler;

the angle vernier is provided with an angle scale surface, is positioned above the angle scale of the main scale and inclines towards the angle scale of the main scale so as to facilitate the alignment of scribed lines during measurement and reading;

the angle vernier and the auxiliary ruler rotate stably around the angle scale reference circle center of the main ruler, and an angle gib is embedded at the bottom of the U-shaped groove to adjust the rotating gap; 30 grids of marked lines are equally divided on the angle scale surface according to 29 degrees, and the marked lines are matched with the angle scale of the main scale for measurement.

The technical effects of the utility model reside in that: 1. the whole structure is simple, compact and wear-resistant, and the manufacture, measurement and maintenance are convenient; 2. the components can be made of carbon steel, tool steel or stainless steel, and the hardness of the main measuring surface meets the hardness requirement for common measurement; 3. the main and auxiliary legs adopt a symmetrical V-shaped groove structure, and can adapt to the positioning of the highest point bus of the circumference of workpieces with different diameters of circular sections; 4. the end parts of the V-shaped grooves of the main legs and the auxiliary legs deviate from the final bending line of the starting bending line by a certain size, so that the local deformation part of the starting bending part of the circular-section workpiece is well avoided, and the measurement accuracy is improved; 5. the main and auxiliary feet adopt a semicircular concave-convex calibration positioning structure when the bending angle is 0 degree, so that the requirement of repeatedly arranging a radius scale line and a radius vernier on the auxiliary ruler is avoided, and the structure of the auxiliary ruler is simplified; 6. the main foot adopts a bilateral sliding positioning structure, the sliding gap can be adjusted by adopting a copper sheet in the sliding groove on one side, and the cylindrical shaft surface is adopted on the other side for contact movement, so that the sliding precision and stability are improved; 7. the main and auxiliary legs are fastened by knurling adjusting screws, so that the operation is simple and convenient; 8. the main foot is positioned and read by cursor indication, and the scale marks are obliquely aligned with the scale marks of the main scale, so that the alignment accuracy and precision are improved, and the setting precision of the measurable round-section workpiece bending radius can reach 0.05 mm; 9. the size of the angle dial scale can be free of the small radius limit of a bent workpiece, the radius of the disc surface can be larger than the bending radius of the workpiece with the circular section to be measured, the scribing interval of the angle can be easily set to be more than 1mm, the scribing length and the angle mark can be set to be larger, and the scribing processing and measuring angle reading and observing difficulty is reduced; 10. the bending angle adopts a 30-grid angle vernier measuring structure, and the precision of measuring the bending angle can reach 2' (1/30 degrees); 11. the auxiliary foot of the auxiliary ruler adopts a dovetail groove sliding structure, and the sliding gap can be adjusted by adopting an inlaid strip in a sliding groove of the sliding groove, so that the sliding precision and stability are improved; 12. the auxiliary ruler counter bore sliding slot hole structure is simple to process, and the structural requirement that the auxiliary foot is positioned on the bottom surface of the main ruler dial disc when the small bending radius is measured is effectively avoided; 13. the upper edges of the main ruler and the auxiliary ruler are designed to be superposed with a start bending line and a final bending line, and the structure that the rotation center is superposed with the bending center is adopted, so that a bending, scribing and lofting tool is considered, the applicability of the measuring device is improved, and the scribing precision operation of a scribing and lofting angle can be improved; 14. the main ruler and the auxiliary ruler are connected with the nut in a positioning mode through the optical axis screw relative to the rotation center, the end portions of the main ruler and the auxiliary ruler are in a knurled structure, rotation is flexible, and fastening operation is convenient; 15. the bolt and nut gibs used for positioning, fixing, gap adjusting and the like of the measuring device can adopt the specifications and the sizes commonly used in the market, and the purchasing and the manufacturing are convenient and fast; 16. the single measuring device integrates the functions of the original special angle measuring rulers with various specifications, simultaneously absorbs the measuring precision advantages of the existing vernier caliper and the universal angle ruler, and greatly improves the convenience and the accuracy of measuring the bending angle of the circular-section workpiece; 17. for a workpiece with a circular section with a bending angle smaller than 180 degrees, the positions of the main leg and the auxiliary leg can be set according to a numerical value slightly larger than the actual bending radius, the bending angle is measured according to the positioning of the outer circumferences of the front section and the rear section of the bending, and the measuring range and the measuring efficiency of the bending angle are improved.

Drawings

Fig. 1 is a plan view of the present invention when the bending angle of the workpiece is measured by 45 °.

Fig. 2 is a side view of the utility model when measuring the bending angle of the workpiece by 180 degrees.

Fig. 3 is a schematic view of the connection between the main leg and the radius cursor and the main ruler of the present invention.

Fig. 4 is a schematic view of the connection between the auxiliary foot and the auxiliary ruler.

Fig. 5 is a schematic structural view of the main leg of the present invention.

Fig. 6 is a schematic structural view of the auxiliary leg of the present invention.

Fig. 7 is a schematic view of the measurement principle of the workpiece according to the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances for purposes of describing the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover such processes, methods, systems, articles, or apparatus that comprise a list of steps or elements, are not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such processes, methods, articles, or apparatus.

In the drawings 1 to 7, the ruler comprises a main ruler 1, a main ruler upper side 1-1, a main ruler long sliding groove hole 1-2, a length scale 1-3, a reference center line 1-4, an angle scale 1-5, an auxiliary ruler 2, an auxiliary ruler upper side 2-1, an auxiliary ruler long sliding groove hole 2-2, a radius vernier 3, a radius vernier center line 3-1, a radius observation hole 3-2, a radius vernier scale line surface 3-3, a first screw 4, a radius adjusting screw 5, an angle vernier 6, an angle vernier scale line surface 6-1, a second screw 7, a main foot 8, a main foot V-shaped groove 8-1, a main foot first screw hole 8-2, a main foot second screw hole 8-3, a main foot calibration semi-circular groove 8-4, a main foot reference center line 8-5, an auxiliary foot 9, an auxiliary foot V-shaped groove 9-1, an auxiliary foot calibration semi-circular bulge 9-2, a main foot, The auxiliary foot reference center line 9-3, the nut 10, the countersunk head screw 11, the anti-rotation nut 12, the anti-rotation screw 13, the main ruler gib 14, the auxiliary ruler gib 15, the angle gib 16, the workpiece 17, the workpiece bending front section 17-1, the workpiece initial bending line 17-2, the workpiece bending section 17-3, the workpiece final bending line 17-4, the workpiece bending rear section 17-5, the workpiece bending front section center line 17-6, the workpiece bending rear section center line 17-7, the workpiece bending center 17-8, the workpiece bending section symmetry center line 17-9, the workpiece bending front section mark line 17-10, the workpiece bending radius R, the workpiece bending rear section mark line 17-11, the workpiece bending angle A, the distance value L between the outer ends of the main foot V-shaped groove 8-1 and the auxiliary foot V-shaped groove 9-1, and the workpiece bending radius estimated value R1.

As shown in fig. 1-7, the utility model relates to a bending angle measuring device, which comprises a main ruler 1, a main foot 8 which is arranged on the main ruler 1 in a sliding way, and an auxiliary ruler 2 which is arranged in a rotating way. A first sliding locking mechanism is arranged between the main ruler 1 and the main foot 8, an anti-rotation locking mechanism is arranged between the main ruler 1 and the auxiliary ruler 2, an auxiliary foot 9 is arranged on the auxiliary ruler 2 in a sliding mode, and a second sliding locking mechanism is arranged between the auxiliary ruler 2 and the auxiliary foot 9; the main scale 1 is provided with length scales and angle scales, the peripheral height is higher than the inner surface, and the abrasion and the fuzziness of the numbers of the radius and the angle scales in the measuring and using process are avoided, so that the bending radius and the angle indication are prevented from being influenced; the main foot 8 is provided with a radius vernier 3, and the auxiliary ruler 2 is provided with an angle vernier 6.

The upper plane of the main ruler 1 is provided with length scales 1-3 and angle scales 1-5, the bending radius of a measured workpiece 17 can be accurately set and locked by matching with the radius vernier 3, and the bending angle can be accurately indicated and read by matching with the angle vernier 6; the upper edge 1-1 of the main ruler coincides with the 0-degree scale mark and the 180-degree scale mark of the angle scale 1-5 and coincides with the workpiece initial curve line 17-2; the main ruler 1 is provided with a main ruler long sliding groove hole 1-2, and the long central line of the main ruler long sliding groove hole 1-2 is parallel to the upper side 1-1 of the main ruler; the center of a reference circle of the angle scale 1-5 is coincident with the bending center 17-8 of the workpiece, the center of the reference circle of the angle scale 1-5 is provided with a central circular hole, and an anti-rotation locking mechanism is installed and connected with the auxiliary ruler 2, wherein the anti-rotation locking mechanism comprises an anti-rotation nut 12 and an anti-rotation screw 13; the 0 position reference score line of the length scale 1-3 is offset from the reference centerline by a distance S equal to the distance of the 0 position reference score line of the radius cursor 3 from the radius cursor centerline 3-1.

The bottom of the main foot 8 is provided with a main foot V-shaped groove 8-1 which is symmetrical left and right about a main foot reference center line 8-5, the main foot reference center line 8-5 is vertical to the upper side 1-1 of the main ruler, so that the positioning is conveniently carried out according to the outer circumference of the front bending section 17-1 of the workpiece, the initial end part of the main foot V-shaped groove 8-1 deviates from the workpiece initial bending line 17-2 by a certain distance, and the local deformation area of the bending section of the workpiece is effectively avoided; the top surface of the main foot 8 is provided with a first main foot screw hole 8-2, the upper part of the main foot 8 is provided with an L-shaped open chute, the bottom of the chute is provided with a second main foot screw hole 8-3, and the main foot 8 and the radius vernier 3 are provided with a first screw 4 and a first sliding locking mechanism to form a right open chute; the first sliding locking mechanism comprises a radius adjusting screw 5, a main ruler 1 is installed in the right opening chute, the radius adjusting screw 5 adopts the periphery of a cylindrical surface and penetrates through a long sliding groove hole 1-2 of the main ruler to be installed in a second screw hole 8-3 of the main foot, and the main foot 8 and the radius vernier 3 are ensured to slide and be locked in the long sliding groove hole 1-2 of the main ruler; a main ruler panel 14 is embedded inside the L-shaped opening sliding groove of the main foot 8 to adjust the sliding clearance; the main foot 8 is provided with two main foot calibration semicircular grooves 8-4 which are matched with two auxiliary foot calibration semicircular bulges 9-2, and the bending radius values of the calibration main ruler 1 and the auxiliary ruler 2 are the same.

The radius vernier 3 is provided with a radius observation hole 3-2 and a radius cursor scribing surface 3-3, 20 grids of scribed lines are equally divided on the radius cursor scribing surface 3-3 according to 19mm, and the positioning precision can reach 0.05 mm; the scale line surface 3-3 of the radius vernier is inclined towards the length scale 1-3 on the main scale 1, so that the scale lines can be aligned and read conveniently, and the bending radius value of the workpiece at the position of the main foot 8 is displayed; the radius vernier 3 is provided with a first screw 4 and a first sliding locking mechanism which are connected with the main foot 8 and the main ruler 1, and the central line 3-1 of the radius vernier is coincided with the reference central line 8-5 of the main foot and the central line 17-6 of the bending front section of the measured workpiece.

The auxiliary ruler 2 is of a round-head strip-shaped structure, a round hole is formed in the round-head end and is connected with the main ruler 1 through an anti-rotation locking mechanism, the center of the round hole is overlapped with the reference circle center of the angle scale 1-5 of the main ruler 1 and is consistent with the overlapped part of the workpiece bending center 17-8, the fact that the auxiliary ruler 2 can be tightly attached to the lower surface of the main ruler 1 to rotate and lock is guaranteed, and the included angle state between the auxiliary ruler 2 and the main ruler 1 is kept; the extension line of the upper side 2-1 of the auxiliary ruler passes through the center of the circular hole; the upper long edge and the lower long edge of the auxiliary ruler 2 are provided with auxiliary feet 9 in a sliding mode through dovetail groove structures, an auxiliary ruler long sliding groove hole 2-2 is formed in the position, close to the upper edge 2-1 of the auxiliary ruler, of the auxiliary ruler 2, a countersunk head sliding groove hole structure is adopted, the long central line of the auxiliary ruler long sliding groove hole 2-2 is parallel to the upper edge 2-1 of the auxiliary ruler, and a second sliding locking structure is arranged in the countersunk head sliding groove hole and connected with the auxiliary ruler 2; the second sliding locking mechanism comprises a nut 10 and a countersunk head screw 11, the head of the countersunk head screw 11 is matched with the countersunk head sliding groove hole, the top end of the head of the screw 11 is not exposed out of the surface of the auxiliary ruler 2 after assembly, and the lower end of the countersunk head screw 11 is not exposed out of the bottom surface of the auxiliary foot V-shaped groove 9-1 after the countersunk head screw 11 is fastened with the nut 10.

The bottom of the auxiliary foot 9 is provided with an auxiliary foot V-shaped groove 9-1 which is bilaterally symmetrical about an auxiliary foot reference center line 9-3, the auxiliary foot reference center line 9-3 is coincident with a measured workpiece bending rear section center line 17-7, the auxiliary foot reference center line 9-3 is perpendicular to an auxiliary ruler upper edge 2-1, so that positioning is conveniently carried out according to the outer circumference of a workpiece bending rear section 17-5, the starting end part of the auxiliary foot V-shaped groove 9-1 deviates from a workpiece final bending line 17-4 by a certain distance, and a local deformation area of a workpiece final bending part is effectively avoided; the top of the auxiliary foot 9 is provided with a dovetail sliding groove structure for mounting the auxiliary ruler 2, and an auxiliary ruler panel 15 is embedded in the sliding groove for adjusting a sliding gap; the auxiliary foot 9 is provided with two auxiliary foot calibration semicircular bulges 9-2 which are matched with two main foot calibration semicircular grooves 8-4 to carry out the same bending radius value setting and calibration of the main ruler 1 and the auxiliary ruler 2.

The angle vernier 6 is of an L-shaped structure, straight edges on two sides are flush with the upper long edge and the lower long edge of the auxiliary ruler 2, and a second screw 7 is installed to be assembled and fastened with the auxiliary ruler 2 and is positioned on the periphery of the angle dial of the main ruler 1; the angle vernier 6 is provided with an angle scale surface 6-1, is positioned above the angle scale 1-5 of the main scale and inclines towards the angle scale 1-5 of the main scale, so that scribed lines are mutually accurately aligned when measurement and reading are facilitated; the angle vernier 6 and the auxiliary ruler 2 rotate stably around the reference circle center of the main ruler angle scale 1-5, and an angle gib 16 is embedded at the bottom of the U-shaped groove to adjust the rotating clearance; 30 grids of marked lines are evenly divided on the angle scale surface 6-1 according to 29 degrees, and the precision can reach 2' (1/30 degrees) when the angle scale surface is matched with the angle scale 1-5 of the main scale for measurement.

The working process of the utility model is as follows: before use, the measurement device is determined to be qualified after being manufactured, parts of the checking device are checked to be installed perfectly and accurately, numerical value scribed lines are clear, the distance S of a 0-position reference scribed line of the length scale on the main ruler 1 deviating from a reference middle line is equal to the distance S of the 0-position reference scribed line of the radius vernier and the middle line of the radius vernier, the top end of the head of the screw 11 is not exposed out of the surface of the auxiliary ruler 2, and the lower end of the countersunk head screw 11 is not exposed out of the bottom surface of the V-shaped groove 9-1 of the auxiliary foot after being fastened with the nut 10. The upper edge 1-1 of the main ruler is aligned with the upper edge 2-1 of the auxiliary ruler, when the included angle is 0 degree, the two main foot calibration semicircular grooves 8-4 are completely matched and matched with the two auxiliary foot calibration semicircular bulges 9-2, and the 0 numerical scale line on the angle cursor scale line surface 6-1 is aligned with the 0 numerical scale line on the angle scale 1-5 of the main ruler; selecting a straight section of a workpiece with a circular section of a specification to be detected, wherein a main foot V-shaped groove 8-1 and an auxiliary foot V-shaped groove 9-1 are bridged on the outer circumference of the straight section of the workpiece, two sides of the main foot V-shaped groove 8-1 and the auxiliary foot V-shaped groove 9-1 are in close and stable contact with the outer circumference of the straight section of the workpiece and have no gap, and a central line 3-1 of a radius vernier is superposed with a central line 8-5 of a main foot reference and a central line 9-3 of an auxiliary foot reference are superposed with a central axis of the straight section of the workpiece. After slightly loosening the radius adjusting screw 5, the nut 10 and the anti-rotation nut 12, the main foot 8 and the auxiliary foot 9 are checked and operated to move freely and smoothly, the auxiliary ruler 2 rotates flexibly, and the radius adjusting screw 5, the nut 10 and the anti-rotation nut 12 are locked and then fastened without loosening.

When the device is used, when the bending radius R of a workpiece is known, the position of the locking main foot 8 is firstly adjusted: loosening the radius adjusting screw 5 until the main foot 8 and the radius vernier 3 can stably slide on the main scale 1, moving the position of the main foot 8 on the main scale 1 according to the known numerical value of the bending radius R, checking that the numerical value of the position of the corresponding scale line on the scale from the scale line 0 of the radius vernier to the length scale 1-3 of the main scale in the radius observation hole 3-2 is the same as the numerical value of the integral number of the bending radius R, slightly trimming and moving the main foot 8 outwards until the vernier 3 meets the numerical value of the decimal number of the scale line bending radius R, and fastening and locking the radius adjusting screw 5; each grid of the vernier scale of the radius vernier 3 is 0.05mm, the numerical value X obtained by dividing the decimal numerical value of the bending radius R by 0.05 is the vernier numerical value scale of the radius vernier 3 with the required radius, and the sum value Y of the numerical value X and the integral numerical value of the bending radius R is the position of the corresponding numerical value Y scale on the length scale 1-3 of the main ruler, which is needed to be aligned by the vernier numerical value X scale on the radius vernier 3. For example, R =44.5mm, the main leg 8 is moved to the position where the radius cursor 0 is scribed to align with the corresponding numerical value 44 on the length scale 1-3 of the main scale 1, the numerical value X =10 is calculated by dividing the numerical value 0.5 of the decimal of the radius of curvature R by 0.05, the radius cursor 10 on the radius cursor 3 is scribed to align with the position where the corresponding numerical value 54 is scribed on the length scale 1-3 of the main scale (Y =10+44= 54), and the radius adjusting screw 5 is locked after the scribed lines are aligned.

Readjust the position of the locking auxiliary foot 9: loosening the nut 10 to the auxiliary foot 9 can slide on the auxiliary ruler 2 stably, loosening the anti-rotation nut 12 to the auxiliary ruler 9 rotates flexibly and stably, moving the position of the auxiliary foot 9 to two auxiliary foot calibration semicircular bulges 9-2 which are completely aligned and matched with two main foot calibration semicircular grooves 8-4, aligning the upper edge 1-1 of the main ruler with the upper edge 2-1 of the auxiliary ruler at an included angle of 0 degree, screwing the locking nut 10, and completing the position calibration adjustment and locking of the auxiliary foot 9.

Aligning the upper edge 1-1 of the main ruler with the workpiece initial curve line 17-2, bridging the main foot V-shaped groove 8-1 on the outer circumference of the workpiece bending front section 17-1, checking to ensure that both edges of the main foot V-shaped groove 8-1 are in close and stable contact with the outer circumference of the workpiece bending front section 17-1 without a gap, rotating the auxiliary ruler 2, searching both edges of the auxiliary foot V-shaped groove 9-1 to be in close and stable contact with the outer circumference of the workpiece bending rear section 17-5, screwing the anti-rotation nut 12 to lock after confirming that the two edges are in stable contact without the gap, and projecting the upper edge 2-1 of the auxiliary ruler downwards to obtain the position of the workpiece final curve line 17-4. The device can be removed or the value of the angle at which the angle cursor 6 is aligned with the scribe line can be read in situ, i.e. the bending angle a of the workpiece 17 to be measured.

When the workpiece bending radius R is unknown and the bending angle is less than 180 degrees, an approximate value R1 slightly larger than the workpiece bending radius R needs to be estimated (the closer the workpiece bending angle is to 180 degrees, the closer the value R1 of the bending radius needing to be estimated needs to be to the actual bending radius value R), the main foot 8 positioning locking and the auxiliary foot 9 positioning locking are carried out according to the estimated bending radius value R1 by referring to the operation flow, and the main ruler 1 and the auxiliary ruler 2 are provided with the estimated bending radius R1 which is calibrated to be the same.

Then, estimating a numerical value which is larger than the actual bending angle of the workpiece by comparing the measured values, loosening the anti-rotation nut 12 until the auxiliary ruler 2 rotates flexibly and stably, rotating the auxiliary ruler 2, making the included angle between the upper edge 1-1 of the main ruler and the upper edge 2-1 of the auxiliary ruler approximately equal to the estimated bending angle numerical value, measuring the distance value L between the outer ends of the V-shaped groove 8-1 of the main foot and the V-shaped groove 9-1 of the auxiliary foot, making marking lines 17-10 and 17-11 on the upper outer circle surfaces of the bending front section and the bending rear section of the workpiece with unknown bending radius R according to the distance value, confirming that the marking lines 17-10 and 17-11 are not positioned on the bending section, and the marking lines 17-10 and 17-11 are bilaterally symmetrical about the symmetrical central line 17-9 of the bending section;

and then, respectively bridging the main foot V-shaped groove 8-1 and the auxiliary foot V-shaped groove 9-1 on the outer circumferences of positions near the mark lines of the bending front section and the bending rear section of the workpiece with unknown bending radius R, adjusting the included angle between the main ruler 1 and the auxiliary ruler 2 according to the condition that the main foot V-shaped groove 8-1 and the auxiliary foot V-shaped groove 9-1 contact the outer circumference of the workpiece, until finding out that the two sides of the main foot V-shaped groove 8-1 and the auxiliary foot V-shaped groove 9-1 are tightly and stably contacted with the outer circumference of the workpiece, screwing the anti-rotation nut 12 to lock after uniformly contacting and having no gap, taking down the device or locally reading the angle value corresponding to the alignment mark line of the angle cursor 6 at the moment, namely the bending angle A of the workpiece with unknown bending radius R.

For a circular section bending workpiece, the front section and the rear section generally need to meet the length requirement of a certain straight section and the length requirement of a straight section larger than 50 mm. If the length of the straight section of the finished workpiece after bending does not meet the length requirement of more than 50mm and the length of two sides of the V-shaped groove is not completely matched with the close contact requirement during measurement, the set numerical value of the estimated bending middle diameter needs to be reduced, but the set bending radius numerical value is ensured to be not less than the actual bending radius value; or the front end part and the rear end part of the workpiece bending section are sleeved with circular-section process straight sections with the same outer diameter, the axis of the process straight section is ensured to be concentric and consistent with the axis of the workpiece bending front section and the axis of the workpiece bending rear section, and the length of the straight section part is ensured to meet the length requirement of more than 50mm and then the measurement is carried out.

The device of the utility model is simple in structure is compact, the manufacturing of the similar slide caliper of manufacturing process, general purpose angle measuring tape, and technology is ripe, and a special angle measuring tape that can replace current specification is various maintains convenient to use, and measurement accuracy improves greatly moreover, can be applicable to the accurate measurement of circular cross section work piece tubular product round steel class bending angle in the current boiler production well.

Claims

1. A bending angle measuring apparatus characterized in that: including main scale (1), it sets up main foot (8) to slide on main scale (1), connect vice chi (2) simultaneously in main scale (1) one end rotation, be equipped with first slip locking part between main scale (1) and main foot (8), lock the location to main foot (8) position on main scale (1), be equipped with between main scale (1) and vice chi (2) and prevent changeing locking mechanism, it sets up vice foot (9) to slide on vice chi (2), be equipped with second slip locking mechanism between vice chi (2) and vice foot (9), be equipped with length scale (1-3) and angle scale (1-5) on main scale (1), install radius vernier (3) on main foot (8), install angle vernier (6) on vice chi (2), main foot (8) cooperate with vice foot (9) and fix a position work piece (17).

2. The bending angle measuring apparatus according to claim 1, wherein: the upper plane of the main ruler (1) is provided with length scales (1-3) and angle scales (1-5), the radius vernier (3) is matched to measure the bending radius of the workpiece (17), and the angle vernier (6) is matched to measure the bending angle of the workpiece (17);

the upper edge (1-1) of the main scale (1) is coincided with a connecting line of a 0-degree scale mark and a 180-degree scale mark of the angle scale (1-5), and is coincided with a workpiece initial curve line (17-2) of the workpiece (17);

a main ruler long sliding groove hole (1-2) is formed in the main ruler (1), and the long central line of the main ruler long sliding groove hole (1-2) is parallel to the upper edge (1-1) of the main ruler;

the reference circle center of the angle scale (1-5) is coincident with the workpiece bending center (17-8) of the workpiece (17), and the reference circle center of the angle scale (1-5) is provided with a central circular hole to be connected with the auxiliary ruler (2) through an anti-rotation locking mechanism; the anti-rotation locking mechanism comprises an anti-rotation nut (12) and an anti-rotation screw (13); the distance S of the 0-position reference scale line of the length scale (1-3) deviating from the reference center line (1-4) is equal to the distance between the 0-position reference scale line of the radius vernier (3) and the center line (3-1) of the radius vernier.

3. The bending angle measuring apparatus according to claim 1, wherein: the bottom of the main foot (8) is provided with a main foot V-shaped groove (8-1), the main foot V-shaped groove (8-1) is bilaterally symmetrical about a main foot reference center line (8-5), the main foot reference center line (8-5) is perpendicular to the upper edge (1-1) of the main ruler so as to be positioned according to the outer circumference of the workpiece bending starting front section (17-1), and the starting end part of the main foot V-shaped groove (8-1) deviates from the workpiece bending starting line (17-2) by a distance so as to avoid a local deformation area of the workpiece bending starting part;

a first main foot screw hole (8-2) is formed in the top surface of the main foot (8), an L-shaped opening sliding groove is formed in the upper portion of the main foot (8), a second main foot screw hole (8-3) is formed in the bottom of the L-shaped opening sliding groove, the first main foot screw hole (8-2) of the main foot (8) is connected with the radius vernier (3) through a first screw (4), and the main foot (8) and the radius vernier (3) form a right opening sliding groove;

the first sliding locking mechanism comprises a radius adjusting screw (5), a main ruler (1) is installed in the right open chute, and the radius adjusting screw (5) penetrates through a main ruler long chute hole (1-2) of the main ruler (1) and is installed in a main foot second screw hole (8-3) so as to realize sliding locking of the main foot (8) and the radius vernier (3) in the main ruler long chute hole (1-2);

a main ruler panel (14) is embedded on the inner side of the L-shaped opening sliding groove of the main foot (8) to adjust the sliding clearance; two main foot calibration semicircular grooves (8-4) are formed in the main foot (8), the main foot calibration semicircular grooves (8-4) are matched with auxiliary foot calibration semicircular bulges (9-2) of the auxiliary feet (9) so as to set and calibrate the same bending radius values of the main ruler (1) and the auxiliary ruler (2).

4. The bending angle measuring apparatus according to claim 1, wherein: the radius vernier (3) is provided with a radius observation hole (3-2) and a radius cursor scribing surface (3-3), 20 scribed lines are equally divided on the radius cursor scribing surface (3-3) according to 19mm, and the positioning precision is 0.05 mm;

the radius cursor marking surface (3-3) inclines towards the length scale (1-3) on the main scale (1) so as to be convenient for alignment reading between the markings and display the bending radius value of the workpiece at the position of the main foot (8); the central line (3-1) of the radius vernier coincides with the central line (8-5) of the main foot reference and the central line (17-6) of the bending front section of the measured workpiece (17).

5. The bending angle measuring apparatus according to claim 1, wherein: the auxiliary ruler (2) is of a round-head strip-shaped structure, a round hole is formed in the round head end of the auxiliary ruler (2), the auxiliary ruler is connected with the main ruler (1) through an anti-rotation locking mechanism, the center of the round hole of the auxiliary ruler (2) is overlapped with the reference circle center of the angle scale (1-5) of the main ruler (1) and is overlapped with the bending center (17-8) of a workpiece to be consistent, so that the auxiliary ruler (2) can be tightly attached to the lower surface of the main ruler (1) to be rotationally locked, and the included angle state between the auxiliary ruler and the main ruler (1) is kept;

the auxiliary ruler (2) is provided with an upper side (2-1) of the auxiliary ruler, and the extension line of the upper side (2-1) of the auxiliary ruler passes through the center of the circular hole of the auxiliary ruler (2); the upper long edge and the lower long edge of the auxiliary ruler (2) are provided with auxiliary feet (9) in a sliding mode through dovetail groove structures, an auxiliary ruler long sliding groove hole (2-2) is formed in the position, close to the upper edge (2-1) of the auxiliary ruler, of the auxiliary ruler long sliding groove hole (2-2) and is of a countersunk head sliding groove hole structure, the long central line of the auxiliary ruler long sliding groove hole (2-2) is parallel to the upper edge (2-1) of the auxiliary ruler, and a second sliding locking structure is arranged in the countersunk head sliding groove hole and is connected with the auxiliary ruler (2);

the second sliding locking mechanism comprises a nut (10) and a countersunk head screw (11), the head of the countersunk head screw (11) is matched with the countersunk head sliding groove hole, the top end of the head of the countersunk head screw (11) does not expose the surface of the auxiliary ruler (2), and the lower end of the countersunk head screw (11) is not exposed out of the bottom surface of the auxiliary foot V-shaped groove (9-1) after the countersunk head screw (11) is fastened with the nut (10).

6. The bending angle measuring apparatus according to claim 1, wherein: an auxiliary foot V-shaped groove (9-1) is formed in the bottom of the auxiliary foot (9), the auxiliary foot V-shaped groove (9-1) is bilaterally symmetrical with respect to an auxiliary foot reference center line (9-3), the auxiliary foot reference center line (9-3) is perpendicular to the upper edge (2-1) of the auxiliary ruler, the auxiliary foot reference center line (9-3) is coincident with a bending rear section center line (17-7) of the measured workpiece (17), so that positioning can be performed according to the outer circumference of the bending rear section (17-5) of the workpiece, and the starting end of the auxiliary foot V-shaped groove (9-1) deviates from a workpiece final bending line (17-4) by a distance so as to avoid a local deformation area of the workpiece final bending part;

the top of the auxiliary foot (9) is provided with a dovetail sliding groove structure mounting auxiliary ruler (2), and an auxiliary ruler inlaid strip (15) is inlaid in the dovetail sliding groove structure to adjust a sliding gap; two auxiliary foot calibration semicircular bulges (9-2) are arranged on the auxiliary foot (9).

7. The bending angle measuring apparatus according to claim 1, wherein: the angle vernier (6) is of an L-shaped structure, straight edges on two sides of the angle vernier (6) are flush with upper and lower long edges of the auxiliary ruler (2), and a second screw (7) is mounted and fastened with the auxiliary ruler (2) to form a U-shaped groove structure and arranged on the periphery of the angle dial of the main ruler (1);

the angle vernier (6) is provided with an angle scale surface (6-1), is positioned above the angle scale (1-5) of the main scale and inclines towards the angle scale (1-5) of the main scale, so that scribed lines are aligned with each other when measurement and reading are carried out;

the angle vernier (6) and the auxiliary ruler (2) rotate around the reference circle center of the main ruler angle scale (1-5) stably, and an angle gib (16) is embedded at the bottom of the U-shaped groove to adjust the rotating clearance; 30 grids of marked lines are evenly divided on the angle scale surface (6-1) according to 29 degrees, and the marked lines are matched with the angle scale (1-5) of the main scale for measurement.