A coaxiality detection device for flange connection holes and its detection method

Abstract

The present invention belongs to the field of detection technology, and in particular, to a coaxiality detection device for flange connection holes and a detection method thereof. Aiming at the problems that existing detections mostly rely on manual operations and the coaxiality of flange connection holes cannot be clearly shown by individual detection results, the following solution is proposed. A coaxiality detection device for flange connection holes includes a workbench, on the top of which an L-shaped frame is welded. A multi-stage electric push rod is fixedly penetrated through the L-shaped frame, and a hollow disc is fixed to the output shaft of the multi-stage electric push rod. A plurality of clamping plates are arranged on the top of the workbench, and the plurality of clamping plates cooperate to clamp and fix the flange plate. In the present invention, by pushing the hollow disc downward through the multi-stage electric push rod, the clamping of the flange plate can be completed in sequence and the distance can be measured on the inner walls of two flange plates at the same time. By comparing the data of the two flange plates, the coaxiality of the flange plate can be clearly shown, the operation is simple, and the accuracy is relatively high.

Description

Technical Field

[0001] The present invention relates to the technical field of detection, and particularly relates to a coaxiality detection device for flange connection holes and a detection method thereof. Background Art

[0002] In the production and processing process of valves, the flange, as a key component connecting the valve and the pipeline, undertakes the important responsibility of ensuring the connection stability and sealing performance. In order to effectively prevent installation deviation problems caused by the non-corresponding positions of through holes on the flange, it is particularly important to detect the coaxiality of the flange. Through strict coaxiality detection, potential problems caused by installation deviation can be effectively avoided, ensuring the efficient and safe operation of the valve and pipeline system.

[0003] There are still the following deficiencies in the existing technology during the coaxiality detection of flange connection holes:

[0004] 1. In the existing technology, flange detection mostly relies on manual operation, which not only has low efficiency, is prone to introducing deviations, but also is difficult to achieve automatic positioning and precise detection of the coaxiality of flange connection holes;

[0005] 2. Existing detections are mostly carried out one by one, and the coaxiality of flange connection holes cannot be clearly shown.

[0006] In view of the above problems, the present invention document proposes a coaxiality detection device for flange connection holes and a detection method thereof. Summary of the Invention

[0007] The purpose of the present invention is to solve the shortcomings of the existing technology that mostly relies on manual detection and single detection cannot clearly show the coaxiality of flange connection holes, and to propose a coaxiality detection device for flange connection holes and a detection method thereof.

[0008] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A coaxiality detection device for flange connection holes includes a workbench. An L-shaped frame is welded on the top of the workbench. A multi-stage electric push rod is fixedly penetrated through the L-shaped frame. A hollow disk is fixed to the output shaft of the multi-stage electric push rod. A plurality of clamping plates are arranged on the top of the workbench, and the plurality of clamping plates cooperate to clamp and fix the flange disk;

[0010] It further includes an upper column rotating at the bottom of the hollow disk. First laser rangefinders are fixed on both sides of the upper column. A moving groove is arranged in the workbench. A lifting plate is slidably connected in the moving groove. A lower column is rotatably connected to the top of the lifting plate. Second laser rangefinders are fixed on both sides of the lower column. The upper column and the lower column approach each other and are inserted into the corresponding flange disk for coaxiality detection;

[0011] A clamping structure is arranged inside the workbench and is used to drive a plurality of clamping plates to approach each other to complete the clamping and positioning of the flange plate.

[0012] An approaching structure is arranged on the top of the workbench and is used to drive the upper column and the lower column to move towards each other.

[0013] A rotating structure is arranged between the upper column and the lower column and is used to drive the lower column and the upper column to rotate synchronously to comprehensively measure the inner wall of the corresponding flange plate.

[0014] In a possible design, the clamping structure includes a rotating shaft that rotates through the workbench. The top of the rotating shaft is rotatably connected to the bottom of one side of the L-shaped frame. One side of the hollow disk is fixed with a cross plate, and one end of the cross plate is slidably connected to one side of the L-shaped frame. The top end of the rotating shaft penetrates through the cross plate. The outer wall of the rotating shaft is provided with a spiral track groove and a vertical groove. The bottom end of the spiral track groove is communicated with the top end of the vertical groove. A sliding block is fixed inside the cross plate, and the sliding block is slidably matched with the spiral track groove and the vertical groove. The sliding block is used in cooperation with the spiral track groove and the vertical groove to drive the rotating shaft to rotate. The bottom end of the rotating shaft is fixed with a bevel gear. The bottom of the workbench is rotatably connected with a turntable. An annular bevel gear meshing with the bevel gear is fixedly sleeved on the outer wall of the turntable. A plurality of arc grooves are arranged inside the turntable. A pin shaft is slidably matched in each of the plurality of arc grooves. A plurality of sliding grooves are arranged inside the workbench. The top ends of the plurality of pin shafts respectively slide and extend into the corresponding sliding grooves. A plurality of clamping plates are respectively arranged at the top ends of the corresponding pin shafts. The pin shaft is used in cooperation with the sliding groove and the arc groove to drive the plurality of clamping plates to move. The output shaft of the multi-stage electric push rod drives the hollow disk and the cross plate to move downwards. The cross plate drives the rotating shaft and the bevel gear to rotate through the cooperation of the sliding block with the spiral track groove and the vertical groove. The bevel gear is used in cooperation with the annular bevel gear to drive the turntable to rotate. The arc groove drives the plurality of clamping plates to move towards the middle through the cooperation with the pin shaft and the sliding groove, completing the clamping and fixing of the two flange plates.

[0015] In a possible design, the facing structure includes two L-shaped substrates welded to the top of the workbench. A spur gear is rotatably connected between the two L-shaped substrates. A second rack and a first rack are respectively meshed on both sides of the spur gear. The bottom end of the first rack is fixed to the top of the side of the lifting plate away from the lower column. The same fixed table is fixed to the tops of the two L-shaped substrates. The side of the second rack away from the spur gear is slidably connected to the fixed table. The cooperation of the second rack, the spur gear and the first rack can control the lifting of the lifting plate and the lower column. The top end of the second rack is fixed with an abutting plate, and one end of the abutting plate is slidably connected to one side of the L-shaped frame. One end of the rotating shaft penetrates through the abutting plate, and the abutting plate is located below the cross plate; the cross plate pushes the abutting plate and the second rack downward. The cooperation of the second rack, the spur gear and the first rack can move the lifting plate and the lower column upward. Therefore, the lower column and the upper column move toward each other and are inserted into two adjacent flange plates, and then the inner walls of the corresponding two flange plates can be detected by the upper column, the first laser rangefinder, the lower column and the second laser rangefinder, so as to calculate the coaxiality of the flange plates.

[0016] In a possible design, the rotating structure includes a hexagonal groove provided at the bottom of the upper column. A hexagonal clamping post is slidably connected in the hexagonal groove. The top end of the hexagonal clamping post and the top inner wall of the hexagonal groove are fixed with the same spring. A hexagonal clamping groove engaged with the hexagonal clamping post is provided at the top end of the lower column. The cooperation of the hexagonal clamping post and the hexagonal clamping groove can make the upper column and the lower column rotate synchronously. A driving motor is fixed to the bottom of the lifting plate. The output shaft of the driving motor is fixedly connected to the bottom end of the lower column; the lower column and the upper column move toward each other until the hexagonal clamping post is inserted into the hexagonal clamping groove, and then the driving motor drives the lower column to rotate. The lower column drives the upper column to rotate through the cooperation of the hexagonal clamping groove and the hexagonal clamping post. Furthermore, the first laser rangefinder and the second laser rangefinder on the upper column and the lower column can measure the inner walls of the corresponding flange plates at the same angle. When the upper column and the lower column rotate several circles, the distances between the inner walls of the two flange plates and the upper column and the lower column can be measured. In addition, the upper column and the lower column can detect the inner wall distances of the flange plates again at different heights, and then the axial center positions of the two flange plates can be calculated, and the comparison of the two groups of data can clearly show the coaxiality of the two flange plates.

[0017] In a possible design, a connecting plate is fixed to the side of the first rack away from the lower column. A tension spring is fixed to the bottom of the connecting plate. The bottom end of the tension spring is fixedly connected to the bottom inner wall of the moving groove, which is used to reset the lifting plate and the abutting plate.

[0018] In a possible design, rubber sheets are provided on the sides of the plurality of clamping plates close to each other, which is used to increase the friction between the clamping plates and the flange plates and improve the clamping stability.

[0019] In a possible design, the number of each of the plurality of pin shafts and clamping plates is three. A pin post is fixed to the bottom of one of the clamping plates, and a pin hole is provided at the top of one of the pin shafts. The pin post is slidably inserted into the pin hole for facilitating the disassembly of the corresponding clamping plate, and further facilitating the placement of the flange between the three clamping plates later. The other two clamping plates are respectively fixed to the tops of the corresponding pin shafts.

[0020] In a possible design, an air injection hose is fixed to the top of the hollow disk. One end of the air injection hose is communicated with an external compressed air pump. A plurality of inclined holes are provided at the bottom of the hollow disk for removing dust on the inner wall of the flange. When the hollow disk drives the upper column and is about to be inserted into the flange, the external compressed air pump injects compressed gas into the hollow disk through the air injection hose and blows it towards the inner wall of the flange through the inclined holes, thereby removing the dust attached to the inner wall of the flange and ensuring the accuracy of later detection.

[0021] In a possible design, two bearing disks are rotatably connected to the top of the workbench. The tops of the two bearing disks are used for placing flanges. Rubber pads are fixed to the tops of the two bearing disks for increasing the friction between the bearing disks and the flange flat disks. A cleaning cotton block is fixed to the top of the workbench and is located between the two bearing disks for cleaning the outer walls of two adjacent flanges. Drive shafts are fixed to the bottoms of the two bearing disks. The bottom ends of the two drive shafts rotatably extend below the workbench. The two drive shafts are connected by a belt pulley and a belt. A first synchronous pulley is fixed to the bottom end of one of the drive shafts. The bottom of the bevel gear is fixed with a second synchronous pulley through a fixed shaft. The second synchronous pulley is connected to the first synchronous pulley by a synchronous belt, and the diameter of the second synchronous pulley is larger than that of the first synchronous pulley for increasing the number of rotation circles of the bearing disk. The bevel gear drives one of the drive shafts to rotate through the cooperation of the second synchronous pulley, the first synchronous pulley and the synchronous belt, and the two drive shafts are connected by a belt pulley and a belt, thereby driving the two bearing disks to rotate. At this time, the cleaning cotton block can clean the dirt attached to the outer wall of the rotating flange to avoid damage to the outer wall of the flange by the clamping plate under the action of the dirt during later detection.

[0022] In this application, a detection method for a coaxiality detection device of a flange connection hole includes the following steps:

[0023] S1. Stack two flanges of the same specification on the workbench, and drive the hollow disk and the cross plate to move down through a multi-stage electric push rod; the cross plate drives the rotating shaft, the bevel gear and the turntable to rotate through the cooperation of the sliding block with the spiral track groove and the vertical groove, and further drives the clamping plate to move towards the center to realize the clamping and fixing of the flange.

[0024] S2. Continue to move the hollow disk and the cross plate downward, pushing the abutting plate and the second rack downward. Through the cooperation of the second rack, the spur gear and the first rack, the lifting plate and the lower column move upward and are inserted into the flange towards the upper column until the hexagonal clamping post is locked with the hexagonal clamping groove. The driving motor drives the lower column to rotate, and through the cooperation of the hexagonal clamping post and the hexagonal clamping groove, the upper column is driven to rotate synchronously, so that the first laser rangefinder and the second laser rangefinder measure the distance from the inner wall of the flange at the same angle. Rotate multiple times and measure at different heights to calculate the axial position of the flange and evaluate the coaxiality.

[0025] S3. When the hollow disk approaches the flange, compressed gas is injected through the air injection hose and blown towards the inner wall of the flange through the inclined holes to remove dust and ensure the detection accuracy.

[0026] S4. Place the flange on the top of the bearing plate. The bearing plate is stabilized by increasing the friction force through the rubber pad. When the bevel gear rotates, through the transmission of the second synchronous wheel, the first synchronous wheel, the synchronous belt, the belt and the belt pulley, the two bearing plates are driven to rotate synchronously, and the cleaning cotton block cleans the dirt on the outer wall of the flange to prevent the clamping plate from damaging the flange.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] In the present invention, a spiral track groove and a vertical groove are provided on the outer wall of the rotating shaft. A sliding block is fixed in the cross plate. The bottom end of the rotating shaft is fixed with a bevel gear. An bevel gear ring meshing with the bevel gear is fixedly sleeved on the outer wall of the turntable. A plurality of arc grooves are provided in the turntable. A plurality of pin shafts are slidably fitted in the plurality of arc grooves. The top ends of the plurality of pin shafts respectively slide and extend into the corresponding sliding grooves. When the cross plate moves downward, the rotating shaft and the bevel gear are driven to rotate through the cooperation of the sliding block with the spiral track groove and the vertical groove, and then the turntable is driven to rotate. Under the cooperation of the arc groove with the pin shaft and the sliding groove, a plurality of clamping plates are driven to move towards the middle to complete the clamping and fixing of the two flanges.

[0029] In the present invention, a spur gear is rotatably connected between the two L-shaped base plates. The two sides of the spur gear are respectively meshed with a second rack and a first rack. The bottom end of the first rack is fixed on the top of the lifting plate. The second rack is slidably connected with the fixed table. The cooperation of the second rack, the spur gear and the first rack can control the lifting of the lifting plate and the lower column. The cross plate pushes the abutting plate and the second rack downward. The cooperation of the second rack, the spur gear and the first rack can make the lifting plate and the lower column move upward. Therefore, the lower column and the upper column move towards each other and are inserted into two adjacent flanges, and then the inner walls of the two flanges are detected. By comparing the two groups of data, the coaxiality of the flange can be simply and clearly displayed.

[0030] In the present invention, a hexagonal clamping post is slidably connected in the hexagonal groove, and a spring is fixed between the top end of the hexagonal clamping post and the top inner wall of the hexagonal groove. A hexagonal clamping groove engaged with the hexagonal clamping post is provided at the top end of the lower column. The lower column and the upper column move towards each other until the hexagonal clamping post is inserted into the hexagonal clamping groove. Then, the driving motor drives the lower column to rotate. The lower column drives the upper column to rotate through the cooperation of the hexagonal clamping groove and the hexagonal clamping post. Thus, the first laser rangefinder and the second laser rangefinder on the upper column and the lower column can measure the inner wall of the corresponding flange at the same angle. When the upper column and the lower column rotate several circles, the distances between the inner walls of the two flanges and the upper column and the lower column can be measured. In addition, the upper column and the lower column can detect the distance of the inner wall of the flange again at different heights, automatically completing the coaxiality detection of the flange holes. And through multiple detections, accurate detection data can be obtained.

[0031] In the present invention, the hollow disk is pushed down by a multi-stage electric push rod, which can successively complete the clamping of the flange and the ranging of the inner walls of the two flanges at the same time. By comparing the data of the two flanges, the coaxiality of the flanges can be simply and clearly displayed. The operation is simple and the accuracy is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional structural schematic diagram of a flange connection hole coaxiality detection device provided in Embodiment 1 of the present invention;

[0033] Figure 2 It is a main sectional structural schematic diagram of a flange connection hole coaxiality detection device provided in Embodiment 1 of the present invention;

[0034] Figure 3 It is a three-dimensional sectional structural schematic diagram of the hollow disk and the upper column of a flange connection hole coaxiality detection device provided in Embodiment 1 of the present invention;

[0035] Figure 4 It is a three-dimensional exploded structural schematic diagram of the rotating shaft, the spiral track groove, the cross plate and the sliding block of a flange connection hole coaxiality detection device provided in Embodiment 1 of the present invention;

[0036] Figure 5 It is a three-dimensional exploded structural schematic diagram of the turntable, the pin shaft and the clamping plate of a flange connection hole coaxiality detection device provided in Embodiment 1 of the present invention;

[0037] Figure 6 It is a three-dimensional exploded structural schematic diagram of the workbench and the pin shaft of a flange connection hole coaxiality detection device provided in Embodiment 1 of the present invention;

[0038] Figure 7A three-dimensional exploded structural schematic diagram of the lifting plate, abutting plate and spur gear of a coaxiality detection device for flange connection holes provided in Embodiment 1 of the present invention;

[0039] Figure 8 A main view sectional structural schematic diagram of a coaxiality detection device for flange connection holes provided in Embodiment 2 of the present invention;

[0040] Figure 9 A top view structural schematic diagram of the workbench, bearing plate and cleaning cotton block of a coaxiality detection device for flange connection holes provided in Embodiment 2 of the present invention;

[0041] Figure 10 is Figure 4 an enlarged view of part A in

[0042] In the figure: 1, workbench; 2, L-shaped frame; 3, multi-stage electric push rod; 4, hollow disk; 5, cross plate; 6, rotating shaft; 7, spiral track groove; 8, vertical groove; 9, sliding block; 10, bevel gear; 11, turntable; 12, bevel gear ring; 13, arc groove; 14, pin shaft; 15, sliding groove; 16, clamping plate; 17, pin column; 18, pin hole; 19, inclined hole; 20, air injection hose; 21, upper column; 22, hexagonal groove; 23, spring; 24, hexagonal clamping column; 25, first laser rangefinder; 26, moving groove; 27, lifting plate; 28, lower column; 29, second laser rangefinder; 30, hexagonal card slot; 31, drive motor; 32, L-shaped base plate; 33, spur gear; 34, first rack; 35, connecting plate; 36, tension spring; 37, fixed table; 38, second rack; 39, abutting plate; 40, bearing plate; 41, transmission shaft; 42, first synchronous pulley; 43, second synchronous pulley; 44, cleaning cotton block. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0044] Embodiment 1: Refer to Figure 1 and Figure 2 , the detection device relates to the technical field of flange hole detection. The device mainly includes a workbench 1, and an L-shaped frame 2 is fixedly welded to the top of the workbench 1. Inside the L-shaped frame 2, a multi-stage electric push rod 3 is fixedly installed through. A hollow disk 4 is fixedly connected to the output shaft of the multi-stage electric push rod 3. On the top of the workbench 1, a plurality of clamping plates 16 are provided. When these clamping plates 16 are used in cooperation, they can effectively clamp and fix the flange plate.

[0045] Refer to Figure 2 , Figure 3and Figure 7 , at the bottom of the hollow disc 4, an upper upright column 21 is rotatably installed. First laser rangefinders 25 are fixed on both sides of the upper upright column 21. A moving groove 26 is provided inside the workbench 1, and a lifting plate 27 is slidably connected in the moving groove 26. The top of the lifting plate 27 is rotatably connected to a lower upright column 28, and second laser rangefinders 29 are also fixed on both sides of the lower upright column 28. When in use, the upper upright column 21 and the lower upright column 28 will approach each other and be inserted into the corresponding flange for coaxiality detection.

[0046] Refer to Figure 2 , Figure 4 , Figure 5 , Figure 10 and Figure 6 , in order to achieve the clamping function, a clamping structure is provided inside the workbench 1. This structure includes a rotating shaft 6 that rotatably penetrates the workbench 1, and the top of the rotating shaft 6 is rotatably connected to the bottom of one side of the L-shaped frame 2. A cross plate 5 is fixed on one side of the hollow disc 4, and one end of the cross plate 5 is slidably connected to one side of the L-shaped frame 2. The top end of the rotating shaft 6 penetrates the cross plate 5, and a spiral track groove 7 and a vertical groove 8 are provided on the outer wall of the rotating shaft 6. The bottom end of the spiral track groove 7 is connected to the top end of the vertical groove 8. A sliding block 9 is fixed inside the cross plate 5, and this sliding block 9 is slidably engaged with the spiral track groove 7 and the vertical groove 8. When the output shaft of the multi-stage electric push rod 3 drives the hollow disc 4 and the cross plate 5 to move downward, the cross plate 5 will drive the rotating shaft 6 to rotate through the cooperation of the sliding block 9 with the spiral track groove 7 and the vertical groove 8. A bevel gear 10 is fixed to the bottom end of the rotating shaft 6, a turntable 11 is rotatably connected to the bottom of the workbench 1, and a bevel gear ring 12 meshing with the bevel gear 10 is fixedly sleeved on the outer wall of the turntable 11. A plurality of arc grooves 13 are provided inside the turntable 11, and a pin shaft 14 is slidably engaged in each of these arc grooves 13. A plurality of sliding grooves 15 are provided inside the workbench 1, and the top ends of the pin shafts 14 respectively slide and extend into the corresponding sliding grooves 15. At the top ends of the sliding grooves 15, a plurality of clamping plates 16 are provided. In this way, the cooperation of the pin shafts 14 with the sliding grooves 15 and the arc grooves 13 can drive the plurality of clamping plates 16 to move, thereby completing the clamping and positioning of the flange.

[0047] Refer to Figure 5, three pin shafts 14 and three clamping plates 16 are provided in the device. A pin post 17 is fixed to the bottom of one of the clamping plates 16, and a pin hole 18 is provided at the top of a corresponding pin shaft 14. The pin post 17 and the pin hole 18 are connected by a sliding plug-in fit, and such a design enables the clamping plate 16 to be easily disassembled. When it is necessary to detect the flange, the clamping plate 16 with the pin post 17 can be removed first, and then the flange is placed in the space enclosed by the other two fixed clamping plates 16 and the just-removed clamping plate 16. After that, the clamping plate 16 is reinstalled through the cooperation of the pin post 17 and the pin hole 18 to fix the flange. The other two clamping plates 16 are directly fixed to the tops of the corresponding pin shafts 14.

[0048] Referring to Figure 2 and Figure 7 , in order to realize the relative movement of the upper column 21 and the lower column 28, a relative structure is provided on the top of the workbench 1. This structure includes two L-shaped substrates 32 welded to the top of the workbench 1, and a spur gear 33 is rotatably connected between the two L-shaped substrates 32. A second rack 38 and a first rack 34 are respectively engaged on both sides of the spur gear 33. The bottom end of the first rack 34 is fixed to the top of the side of the lifting plate 27 away from the lower column 28. A fixed table 37 is fixed to the tops of the two L-shaped substrates 32, and the side of the second rack 38 away from the spur gear 33 is slidably connected to the fixed table 37. In this way, the cooperation of the second rack 38, the spur gear 33 and the first rack 34 can control the lifting of the lifting plate 27 and the lower column 28. A contact plate 39 is fixed to the top end of the second rack 38. One end of the contact plate 39 is slidably connected to one side of the L-shaped frame 2. One end of the rotating shaft 6 penetrates through the contact plate 39, and the contact plate 39 is located below the cross plate 5. When the cross plate 5 moves downward, it will push the contact plate 39 and the second rack 38 downward, and then through the cooperation of the second rack 38, the spur gear 33 and the first rack 34, the lifting plate 27 and the lower column 28 move upward. Therefore, the lower column 28 and the upper column 21 will move relatively and insert into two adjacent flanges.

[0049] Referring to Figure 3 and Figure 7, In addition, in order to achieve the synchronous rotation of the upper column 21 and the lower column 28, a rotating structure is provided between them. This structure can drive the lower column 28 and the upper column 21 to rotate synchronously, so as to comprehensively measure the inner wall of the corresponding flange. The specific setting of the rotating structure is as follows: A hexagonal groove 22 is opened at the bottom of the upper column 21. A hexagonal clamping post 24 is slidably connected in this hexagonal groove 22. In order to keep the hexagonal clamping post 24 stable at a certain position in the hexagonal groove 22 when not subjected to external force, a spring 23 is fixedly connected between the top end of the hexagonal clamping post 24 and the top inner wall of the hexagonal groove 22. In this way, when the hexagonal clamping post 24 is forced to move downward, the spring 23 will be compressed, and when the external force disappears, the spring 23 will push the hexagonal clamping post 24 to reset. At the top end of the lower column 28, a hexagonal clamping groove 30 matching the hexagonal clamping post 24 is opened. When it is necessary to rotate the upper column 21 and the lower column 28 synchronously, first move the lower column 28 and the upper column 21 towards each other until the hexagonal clamping post 24 can be inserted into the hexagonal clamping groove 30. At this time, the cooperation between the hexagonal clamping post 24 and the hexagonal clamping groove 30 realizes the synchronous rotation of the upper column 21 and the lower column 28.

[0050] Refer to Figure 7 , At the bottom of the lifting plate 27, a driving motor 31 is fixedly connected. The output shaft of this driving motor 31 is fixedly connected to the bottom end of the lower column 28. Therefore, when the driving motor 31 is started, it will drive the lower column 28 to rotate. Due to the cooperation between the hexagonal clamping post 24 and the hexagonal clamping groove 30, the rotation of the lower column 28 will drive the upper column 21 to rotate synchronously.

[0051] Specifically, two first laser rangefinders 25 and second laser rangefinders 29 are respectively installed on the upper column 21 and the lower column 28. When the upper column 21 and the lower column 28 rotate, these two laser rangefinders can measure the inner wall of the corresponding flange at the same angle. By rotating several circles, the distances between the inner walls of the two flanges and the upper column 21 and the lower column 28 can be measured respectively. In addition, by adjusting the height of the lifting plate 27, the upper column 21 and the lower column 28 can detect the inner wall distance of the flange at different heights. In this way, the axial center positions of the two flanges can be calculated according to the measured data, and the coaxiality of the two flanges can be clearly shown by comparing the two groups of data.

[0052] Refer to Figure 2 and Figure 7, To further increase the stability and reset function of the device, a connecting plate 35 is fixedly connected to the side of the first rack 34 away from the lower column 28. At the bottom of the connecting plate 35, a tension spring 36 is fixedly connected. The bottom end of the tension spring 36 is fixedly connected to the bottom inner wall of the moving groove 26. In this way, when the lifting plate 27 or the abutting plate 39 is moved by an external force, the tension spring 36 will be stretched or compressed. And when the external force disappears, the tension spring 36 will push the lifting plate 27 and the abutting plate 39 to move back to their original positions.

[0053] In addition, to improve the clamping stability of the clamping plates 16 on the flange, rubber sheets are provided on the sides of the plurality of clamping plates 16 that are close to each other. These rubber sheets can increase the friction between the clamping plates 16 and the flange, thereby preventing the flange from sliding or rotating during the detection process.

[0054] To remove the dust on the inner wall of the flange, an air injection hose 20 is fixed to the top of the hollow disk 4, and one end of the air injection hose 20 is communicated with an external compressed air pump. A plurality of inclined holes 19 are provided at the bottom of the hollow disk 4. When the hollow disk 4 drives the upper column 21 and is about to be inserted into the flange, the external compressed air pump can be started. The compressed air pump injects compressed gas into the hollow disk 4 through the air injection hose 20, and these gases then blow towards the inner wall of the flange through the inclined holes 19, thereby removing the dust attached to the inner wall of the flange. Such a design can ensure the accuracy of the later detection and avoid affecting the detection results due to dust.

[0055] The coaxiality detection device for flange connection holes in this embodiment can not only conveniently fix and disassemble the flange, but also clean the inner and outer walls of the flange, thereby ensuring the accuracy and safety of the detection. In addition, this device can also accurately measure and display the coaxiality of two flanges, providing strong support for the quality control of flange connection.

[0056] Embodiment 2: Refer to Figure 8 and Figure 9 , on the basis of Embodiment 1, an improvement is made: Two bearing disks 40 are rotatably connected to the top of the workbench 1, and the tops of these two bearing disks 40 are used to place the flanges to be detected. Rubber pads are fixedly provided on the tops of the bearing disks 40 to increase the friction between the bearing disks 40 and the flanges and prevent the flanges from slipping during rotation. A cleaning cotton block 44 is also fixedly provided on the top of the workbench 1, and the cleaning cotton block 44 is located between the two bearing disks 40. When the flanges on the two bearing disks 40 rotate, the cleaning cotton block 44 can clean the dirt attached to the outer wall of the rotating flange.

[0057] Refer to Figure 8 and Figure 9, To achieve the rotation of the carrier plate 40 and its cooperation with the cleaning cotton block 44, drive shafts 41 are fixed to the bottoms of both carrier plates 40. The bottom ends of the drive shafts 41 extend rotatably below the workbench 1. The two drive shafts 41 are connected by belt pulleys and belts for synchronous rotation. A first synchronous wheel 42 is fixed to the bottom end of one of the drive shafts 41, while a second synchronous wheel 43 is fixed to the bottom of the bevel gear 10 by a fixed shaft. The second synchronous wheel 43 and the first synchronous wheel 42 are connected by a synchronous belt. In particular, the diameter of the second synchronous wheel 43 is larger than that of the first synchronous wheel 42. Such a design can increase the number of rotation cycles of the carrier plate 40, thus ensuring that the cleaning cotton block 44 has sufficient time to clean the outer wall of the flange plate.

[0058] During actual use, the bevel gear 10 drives one of the drive shafts 41 to rotate through the cooperation of the second synchronous wheel 43, the first synchronous wheel 42 and the synchronous belt. Then this drive shaft 41 drives the other drive shaft 41 to rotate synchronously through the cooperation of belt pulleys and belts, thereby driving the two carrier plates 40 to rotate. At this time, the cleaning cotton block 44 can clean the outer wall of the rotating flange plate, avoiding damage to the outer wall of the flange plate by the clamping plate 16 under the action of dirt during later detection.

[0059] A detection method for a flange connection hole coaxiality detection device includes the following steps:

[0060] S1. During use, stack two flange plates of the same specification on the workbench 1. The output shaft of the multi-stage electric push rod 3 drives the hollow disk 4 and the cross plate 5 to move downward. The cross plate 5 drives the rotating shaft 6 and the bevel gear 10 to rotate through the cooperation of the sliding block 9 with the spiral track groove 7 and the vertical groove 8. The bevel gear 10 and the bevel gear ring 12 cooperate to drive the turntable 11 to rotate. The arc groove 13 drives a plurality of clamping plates 16 to move towards the middle through the cooperation with the pin shaft 14 and the sliding groove 15, completing the clamping and fixing of the two flange plates. When clamping and fixing, the sliding block 9 just moves into the vertical groove 8, so that the clamping of the flange plate can be continuously completed when the hollow disk 4 moves downward.

[0061] S2. The hollow disk 4 and the cross plate 5 continue to move downward. The cross plate 5 pushes the abutting plate 39 and the second rack 38 downward. The cooperation of the second rack 38, the spur gear 33 and the first rack 34 can make the lifting plate 27 and the lower column 28 move upward. Therefore, the lower column 28 and the upper column 21 move toward each other and are inserted into two adjacent flange plates until the hexagonal clamping column 24 is inserted into the hexagonal clamping groove 30. Then, the driving motor 31 drives the lower column 28 to rotate. The lower column 28 drives the upper column 21 to rotate through the cooperation of the hexagonal clamping groove 30 and the hexagonal clamping column 24. Furthermore, the first laser rangefinder 25 and the second laser rangefinder 29 on the upper column 21 and the lower column 28 can measure the inner wall of the corresponding flange plate at the same angle. When the upper column 21 and the lower column 28 rotate several circles, the distances between the inner walls of the two flange plates and the upper column 21 and the lower column 28 can be measured. In addition, the upper column 21 and the lower column 28 can detect the distance of the inner wall of the flange plate again at different heights, so that the axial center positions of the two flange plates can be calculated, and the coaxiality of the two flange plates can be clearly shown by comparing the two groups of data;

[0062] S3. When the hollow disk 4 drives the upper column 21 to be about to be inserted into the flange plate, an external air compressor injects compressed gas into the hollow disk 4 through the air injection hose 20 and blows it toward the inner wall of the flange plate through the inclined hole 19, thereby removing the dust attached to the inner wall of the flange plate and ensuring the accuracy of later detection;

[0063] S4. The two flange plates are respectively placed on the tops of the two bearing disks 40. The two sides of the cleaning cotton block 44 respectively abut against the two flange plates. The rubber pads arranged on the tops of the bearing disks 40 can increase the friction between the flange plate and the bearing disk 40, so that the flange plate is stably placed on the bearing disk 40. When the bevel gear 10 drives the turntable 11 to rotate to clamp the two flange plates, the bevel gear 10 drives one of the transmission shafts 41 to rotate through the cooperation of the second synchronous pulley 43, the first synchronous pulley 42 and the synchronous belt. The two transmission shafts 41 are connected by belt pulleys and belts, thereby driving the two bearing disks 40 to rotate. At this time, the cleaning cotton block 44 can clean the dirt attached to the outer wall of the rotating flange plate, avoiding damage to the outer wall of the flange plate by the clamping plate 16 under the action of the dirt during later detection.

[0064] However, as is well known to those skilled in the art, the working principles and wiring methods of the driving motor 31, the second laser rangefinder 29, the first laser rangefinder 25 and the multi-stage electric push rod 3 are common knowledge. They all belong to conventional means or common general knowledge, so they will not be elaborated here. Those skilled in the art can make any selection according to their needs or convenience.

[0065] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A flange connection hole coaxiality detection device, characterized in that: The workbench (1) comprises an L-shaped frame (2) welded to the top of the workbench (1), a multi-stage electric push rod (3) is fixedly passed through the L-shaped frame (2), an output shaft of the multi-stage electric push rod (3) is fixed with a hollow disk (4), and a plurality of clamping plates (16) are arranged on the top of the workbench (1), and the plurality of clamping plates (16) are used to clamp and fix the flange; It also includes an upper column (21) rotatable at the bottom of the hollow disk (4), a first laser rangefinder (25) being fixed on both sides of the upper column (21), a movable groove (26) being provided in the workbench (1), a lifting plate (27) being slidably connected in the movable groove (26), a lower column (28) being rotatably connected at the top of the lifting plate (27), a second laser rangefinder (29) being fixed on both sides of the lower column (28), and the upper column (21) and the lower column (28) being close to each other and inserted into corresponding flanges for coaxiality detection; A clamping structure, arranged in the workbench (1), for driving a plurality of clamping plates (16) to move closer to each other to complete the clamping and positioning of the flange; An opposing structure, arranged on the top of the workbench (1), and used to drive the upper column (21) and the lower column (28) to move toward each other; A rotating structure is disposed between the upper column (21) and the lower column (28), and is used to drive the lower column (28) and the upper column (21) to rotate synchronously to perform a comprehensive measurement on the inner wall of the corresponding flange; The clamping structure comprises a rotating shaft (6) which rotatably passes through the workbench (1), the top of the rotating shaft (6) being rotatably connected to the bottom of one side of the L-shaped frame (2), a horizontal plate (5) being fixed to one side of the hollow disk (4), and one end of the horizontal plate (5) being slidably connected to one side of the L-shaped frame (2), the top end of the rotating shaft (6) passing through the horizontal plate (5), the outer wall of the rotating shaft (6) being provided with a spiral track groove (7) and a vertical groove (8), the bottom end of the spiral track groove (7) being connected to the top end of the vertical groove (8), a sliding block (9) being fixed inside the horizontal plate (5), and the sliding block (9) being slidably matched with the spiral track groove (7) and the vertical groove (8), and the sliding block (9) being matched with the spiral track groove (7) and the vertical groove (8) for driving the rotating shaft (6) The rotating shaft (6) is rotated, a bevel gear (10) is fixed at the bottom end of the rotating shaft (6), a rotating disk (11) is rotatably connected to the bottom of the workbench (1), an outer wall fixed sleeve of the rotating disk (11) is provided with a bevel gear ring (12) meshing with the bevel gear (10), a plurality of arc grooves (13) are provided in the rotating disk (11), a plurality of pins (14) are slidably matched in the plurality of arc grooves (13), a plurality of sliding grooves (15) are provided in the workbench (1), the top ends of the plurality of pins (14) respectively slide and extend into the corresponding sliding grooves (15), a plurality of clamps (16) are respectively arranged at the top ends of the corresponding pins (14), and the pins (14) cooperate with the sliding grooves (15) and the arc grooves (13) to drive the plurality of clamps (16) to move.

2. A flange connection hole coaxiality detection device according to claim 1, characterized in that: The facing structure comprises two L-shaped base plates (32) welded to the top of the workbench (1); a spur gear (33) is rotatably connected between the two L-shaped base plates (32); a second rack (38) and a first rack (34) are respectively meshed on both sides of the spur gear (33); the bottom end of the first rack (34) is fixed to the top of a side of the lifting plate (27) away from the lower column (28); the tops of the two L-shaped base plates (32) are fixed to the same fixed platform (37); the second rack ( The side of the second rack (38) away from the spur gear (33) is slidably connected to the fixed platform (37); the cooperation between the second rack (38), the spur gear (33) and the first rack (34) can control the lifting and lowering of the lifting plate (27) and the lower column (28); an abutment plate (39) is fixed to the top of the second rack (38), and one end of the abutment plate (39) is slidably connected to one side of the L-shaped frame (2); one end of the rotating shaft (6) passes through the abutment plate (39), and the abutment plate (39) is located below the horizontal plate (5).

3. A flange connection hole coaxiality detection device according to claim 2, characterized in that: The rotating structure comprises a hexagonal groove (22) arranged at the bottom of the upper column (21), a hexagonal clamping column (24) being slidably connected in the hexagonal groove (22), a spring (23) being fixed at the top of the hexagonal clamping column (24) and the top inner wall of the hexagonal groove (22), a hexagonal clamping groove (30) being clamped with the hexagonal clamping column (24) being provided at the top of the lower column (28), the cooperation between the hexagonal clamping column (24) and the hexagonal clamping groove (30) enables the upper column (21) and the lower column (28) to rotate synchronously, and a driving motor (31) is fixed at the bottom of the lifting plate (27), and an output shaft of the driving motor (31) is fixedly connected to the bottom end of the lower column (28).

4. A flange connection hole coaxiality detection device according to claim 3, characterized in that: A connecting plate (35) is fixed to a side of the first rack (34) away from the lower column (28), a tension spring (36) is fixed to the bottom of the connecting plate (35), and the bottom end of the tension spring (36) is fixedly connected to the bottom inner wall of the movable groove (26) for enabling the lifting plate (27) and the abutting plate (39) to perform reset movement.

5. A flange connection hole coaxiality detection device according to claim 4, characterized in that: A rubber sheet is provided on one side of the plurality of clamping plates (16) close to each other, so as to increase the friction between the clamping plates (16) and the flange, thereby increasing the stability of clamping.

6. A flange connection hole coaxiality detection device according to claim 5, characterized in that: The number of the plurality of pins (14) and clamps (16) is three, a pin column (17) is fixed at the bottom of one of the clamps (16), a pin hole (18) is provided at the top of one of the pins (14), and the pin column (17) and the pin hole (18) are slidably plugged into each other, so as to facilitate the disassembly of the corresponding clamp (16), thereby facilitating the later placement of the flange between the three clamps (16), and the other two clamps (16) are respectively fixed on the top of the corresponding pins (14).

7. A flange connection hole coaxiality detection device according to claim 6, characterized in that: An air injection hose (20) is fixed to the top of the hollow disk (4), one end of the air injection hose (20) is connected to an external compressed air pump, and a plurality of inclined holes (19) are provided at the bottom of the hollow disk (4) for removing dust from the inner wall of the flange.

8. A flange connection hole coaxiality detection device according to claim 7, characterized in that: The top of the workbench (1) is rotatably connected to two supporting plates (40), the tops of the two supporting plates (40) are used to place flanges, the tops of the two supporting plates (40) are fixed with rubber pads for increasing the friction between the supporting plates (40) and the flange flat plate, the top of the workbench (1) is fixed with a cleaning cotton block (44), and the cleaning cotton block (44) is located between the two supporting plates (40) and is used to clean the outer walls of two adjacent flanges, the bottoms of the two supporting plates (40) are fixed with a transmission shaft (41), and the two transmission shafts (41) are fixed to the bottoms of the two supporting plates (40). The bottom ends of the shafts (41) are rotated to extend below the workbench (1), and the two transmission shafts (41) are connected via a pulley and a belt transmission. A first synchronous wheel (42) is fixed to the bottom end of one of the transmission shafts (41), and a second synchronous wheel (43) is fixed to the bottom of the bevel gear (10) via a fixed shaft. The second synchronous wheel (43) is connected to the first synchronous wheel (42) via a synchronous belt transmission, and the diameter of the second synchronous wheel (43) is larger than the diameter of the first synchronous wheel (42), so as to increase the number of rotations of the carrier plate (40).

9. A detection method using the flange connection hole coaxiality detection device according to claim 8, characterized in that: The following steps are involved: S1. Stack two flanges of the same specification on a workbench (1), and drive the hollow plate (4) and the horizontal plate (5) to move downward by means of a multi-stage electric push rod (3); the horizontal plate (5) drives the rotating shaft (6), the bevel gear (10), and the turntable (11) to rotate by means of the cooperation between the sliding block (9) and the spiral track groove (7) and the vertical groove (8), thereby driving the clamping plate (16) to move toward the center, thereby clamping and fixing the flange; S2, continue to move the hollow plate (4) and the cross plate (5) downward, push the abutment plate (39) and the second rack (38) downward, and through the cooperation of the second rack (38), the spur gear (33) and the first rack (34), move the lifting plate (27) and the lower column (28) upward, and insert them into the flange plate opposite to the upper column (21) until the hexagonal clamping column (24) and the hexagonal clamping groove (30) are locked; drive the lower column (28) with the driving motor (31) to rotate, and through the cooperation of the hexagonal clamping column (24) and the hexagonal clamping groove (30), drive the upper column (21) to rotate synchronously, so that the first laser rangefinder (25) and the second laser rangefinder (29) measure the distance of the inner wall of the flange plate at the same angle; rotate multiple times and measure at different heights to calculate the axial position of the flange plate and evaluate the coaxiality; S3. When the hollow disk (4) is close to the flange, compressed gas is injected through the gas injection hose (20) and blown toward the inner wall of the flange through the inclined hole (19) to remove dust and ensure detection accuracy; S4. Place the flange on top of the carrier plate (40). The carrier plate (40) is stabilized by increasing friction with a rubber pad. When the bevel gear (10) rotates, the two carrier plates (40) are driven to rotate synchronously. The cleaning cotton block (44) cleans dirt on the outer wall of the flange to prevent the clamping plate (16) from causing damage to the flange.

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