A reference circle marking device for large flange processing

Abstract

The invention relates to a reference circle scribing device for large flange processing, belonging to the technical field of flange processing; the device comprises a base, a clamping assembly is arranged at the center of the upper end surface of the base, the clamping assembly comprises two symmetrical clamping plates, and the workpiece is clamped by the relative movement of the two clamping plates; a horizontal crossbeam is arranged above the clamping assembly, and the crossbeam is connected with the upper end surface of the base through a lifting assembly; a rotating assembly is arranged in the middle of the crossbeam, a horizontal circular plate is rotatably arranged at the lower end of the rotating assembly, an auxiliary scribing assembly is arranged on the circular plate, the auxiliary scribing assembly comprises a shift fork, the upper end of the shift fork is connected with the circular plate, a vertical rotating shaft is arranged at the lower end of the shift fork, an arc plate is arranged at the lower end of the rotating shaft, and a plastic layer is arranged on the outer side of the arc plate; the problem of less processing allowance reserved for blanks manufactured by the current ring rolling machine is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of flange processing, and in particular relates to a reference circle scribing device used for large flange processing. Background Art

[0002] Ring rolling machine is a kind of equipment used to process metal pipe fittings, usually used in pipeline manufacturing and welding processes; it can be used to process the end of the pipe to make it flat, parallel and have a certain angle for subsequent welding work; in order to save raw materials and reduce costs, enterprises often hope to minimize the reserved processing allowance for the blanks manufactured by ring rolling machines; however, due to the influence of various factors, the blanks have a large ovality deviation, and the processing allowance is very small, which brings great difficulties to lathe processing; carelessness may lead to failure of normal processing, seriously affecting product quality, and even causing product scrapping; therefore, it is very necessary to design a special marking equipment. Summary of the invention

[0003] The invention overcomes the shortcomings of the prior art and provides a reference circle marking device for large flange processing, thereby solving the problem that the blanks manufactured by the current ring rolling machine have less reserved processing allowance.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions.

[0005] A reference circle marking device for large flange processing comprises a base, a clamping assembly is arranged at the center of the upper end surface of the base, the clamping assembly comprises two symmetrical clamping plates, and the workpiece is clamped by the relative movement of the two clamping plates; a horizontal beam is arranged above the clamping assembly, and the beam is connected to the upper end surface of the base through a lifting assembly; a rotating assembly is arranged in the middle of the beam, a horizontal circular plate is rotatably arranged at the lower end of the rotating assembly, an auxiliary marking assembly is arranged on the circular plate, the auxiliary marking assembly comprises a shift fork, the upper end of the shift fork is connected to the circular plate, a vertical rotating shaft is arranged at the lower end of the shift fork, an arc plate is arranged at the lower end of the rotating shaft, and a plastic layer is arranged on the outer side of the arc plate.

[0006] Furthermore, the clamping assembly also includes a workbench, a movable seat, a bidirectional screw, a first motor, and a movable seat; the workbench is fixedly arranged at the center of the upper end surface of the base, a slide groove is arranged at the center of the upper end surface of the workbench, a bidirectional screw is rotatably arranged inside the slide groove, and a first motor is also arranged on the upper end surface of the workbench, the output shaft of the first motor is transmission-connected to one end of the bidirectional screw, a movable seat is respectively screwed on the two sections of the external threads of the bidirectional screw, and a clamp is respectively fixedly arranged on the upper end of each movable seat.

[0007] Furthermore, the lifting assembly includes two columns and two cylinders. The two vertical columns are respectively fixed on the upper end surfaces of the bases on both sides of the workbench. A vertical guide groove is respectively provided on the end surfaces on the opposite sides of the two columns. The two ends of the beam respectively extend into the guide grooves of the two columns. A cylinder is respectively fixed at the upper end of each column. The piston rod of the cylinder extends vertically downward into the guide groove, and the piston rods of the two cylinders are respectively fixedly connected to the two ends of the beam.

[0008] Furthermore, the rotating assembly also includes a second motor and a reducer; the second motor is fixedly arranged in the middle of the beam, the reducer is fixedly arranged at the lower end of the second motor, the output shaft of the second motor is connected to the input shaft of the reducer, the output shaft of the reducer is vertically downward, and the output shaft of the reducer is fixedly connected to the center of the circular plate.

[0009] Furthermore, the auxiliary marking assembly also includes an upper connecting rod; a mounting hole is arranged on the circular plate along its radial direction, the upper connecting rod is inserted into the mounting hole, and external threads are respectively arranged at both ends of the outer side surface of the upper connecting rod; the shift fork is a U-shaped rod-like structure opening upward, and a guide opening is respectively arranged at both ends of the upper side of the shift fork; the two ends of the upper connecting rod are respectively arranged inside the guide openings at the two ends of the upper side of the shift fork, and the two ends of the upper connecting rod are respectively screwed with an anti-slip nut.

[0010] Furthermore, a circular positioning seat is fixedly provided at the lower end of the reducer, a concave circular positioning groove is provided at the lower end surface of the positioning seat, and a circular first magnetic block is fixedly provided on the inner top surface of the positioning groove; second magnetic blocks are respectively fixedly provided at both ends of the upper side of the shift fork.

[0011] Furthermore, a square connecting hole that passes through the upper and lower parts is provided in the middle part of the lower side of the shift fork, and the upper end of the rotating shaft is inserted into the connecting hole of the shift fork; a positioning plate and a supporting plate are respectively sleeved on the outer side of the rotating shaft located on the upper and lower sides of the connecting hole, and the positioning plate and the supporting plate are respectively in contact with the upper and lower ends of the middle part of the lower side of the shift fork; a row of inner positioning holes are equidistantly provided on the rotating shaft along its axial direction; the positioning plate and the supporting plate are both annular structures, and outer positioning holes are provided on the side walls of the positioning plate and the supporting plate along the radial direction; when the outer positioning holes on the positioning plate and the supporting plate are aligned with the two adjacent inner positioning holes on the rotating shaft, the locking bolts are respectively passed through the corresponding outer positioning holes and the inner positioning holes and are screwed with locking nuts, thereby fixing the positioning plate and the supporting plate on the rotating shaft, and fixing the rotating shaft and the shift fork through the positioning plate and the supporting plate.

[0012] Furthermore, a horizontal lower connecting rod is fixedly provided at the lower end of the rotating shaft, the middle part of the lower connecting rod is fixedly connected to the lower end of the rotating shaft, and the lower connecting rod is kept parallel to the upper connecting rod; a fastening bolt is screwed at the center of the end surface at both ends of the lower connecting rod; a square limiting groove is respectively provided on the lower side of both ends of the outer side surface of the lower connecting rod; a connecting plate is provided below the lower end of the lower end of the rotating shaft, and two symmetrical hinge seats are fixedly provided on the upper end surface of the connecting plate, a hinge hole is respectively provided inside each hinge seat, and a square limiting block is respectively fixed at the lower end of the inner part of each hinge hole; the two ends of the lower connecting rod are respectively inserted into the hinge holes of the two hinge seats.

[0013] Furthermore, a cross axis is fixedly arranged at the lower end of the connecting plate, and the cross axis includes a fixed cylinder and four fixed rods; the fixed cylinder is a cylindrical structure with openings at both ends, and the upper end opening of the fixed cylinder is connected to the lower end surface of the connecting plate, and a circle of fixing bolts are respectively inserted at the outer edge of the connecting plate, and the fixing bolts pass through the connecting plate and are screwed with the upper end opening of the fixed cylinder, thereby fixing the fixed cylinder and the connecting plate, and then fixing the cross axis and the connecting plate; four fixing rods are fixedly arranged at the middle height of the outer cylindrical surface of the fixed cylinder, and the four fixing rods are arranged in a circular array along the axis of the fixed cylinder, and the fixing rods are arranged along the radial direction of the fixed cylinder.

[0014] Furthermore, the arc plate is a conical cylindrical structure with openings at both ends, and the outer diameter of the upper opening of the arc plate is larger than the outer diameter of the lower opening of the arc plate; the arc plate is located on the outside of the connecting plate, and the arc plate and the connecting plate are coaxially arranged; one end of the four fixing rods is fixedly connected to the outer cylindrical surface of the fixed cylinder, and the other end of the four fixing rods is fixedly connected to the middle height of the inner wall of the arc plate; the plastic layer is laminated on the outer surface of the arc plate, and the upper end of the plastic layer is fixedly connected to the upper end of the arc plate by bolts.

[0015] The beneficial effects of the present invention compared with the prior art are as follows:

[0016] The present invention facilitates the fitting of the inner wall of the workpiece through the cooperation of the arc plate and the plastic layer, thereby improving the workpiece processing efficiency; through the cooperation of the shift fork and the rotating shaft, the plastic layer is conveniently fitted and consumed with the inner wall of the workpiece under the action of gravity and rotation, thereby quickly positioning the workpiece processing range, thereby improving the workpiece processing effect; through the cooperation of the bidirectional screw rod and the movable seat, it is convenient to quickly clamp the workpiece, avoid the plastic layer carrying the workpiece with rotation when abutting against the workpiece, thereby avoiding affecting the processing positioning of the workpiece, thereby improving the workpiece processing efficiency; through the cooperation of the shift fork and the lower connecting rod, it is convenient to evenly fit the plastic layer with the inner wall of the workpiece when descending, thereby improving the processing efficiency; the device is low in cost, high in cost performance and reliability, and plays a very positive role in reducing the blank processing allowance and saving steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a three-dimensional schematic diagram of the present invention after half-section;

[0020] Figure 3 It is a schematic diagram of the connection between the crossbeam, the rotating assembly, and the auxiliary marking assembly;

[0021] Figure 4 It is a schematic diagram of the connection between the shift fork and the rotating shaft;

[0022] Figure 5 It is a schematic diagram of the connection between the hinge seat, the arc plate and the cross shaft;

[0023] Figure 6 is a schematic diagram of the structure of the clamping assembly;

[0024] Figure 7 yes Figure 2 A local enlarged schematic diagram of the middle A;

[0025] Figure 8 yes Figure 2 A partial enlarged schematic diagram of point B in the middle;

[0026] Among them, 1 is a base, 2 is a column, 3 is a guide groove, 4 is a cylinder, 5 is a beam, 6 is a workbench, 7 is a slide groove, 8 is a bidirectional screw, 9 is a first motor, 10 is a moving seat, 11 is a clamping plate, 12 is a workpiece, 13 is a second motor, 14 is a reducer, 15 is a circular plate, 16 is a fork, 17 is a guide port, 18 is an upper connecting rod, 19 is a positioning seat, 20 is a first magnetic block, 21 is a second magnetic block, 22 is a rotating shaft, 23 is an inner positioning hole, 24 is a positioning plate, 25 is a supporting plate, 26 is a lower connecting rod, 27 is a limiting groove, 28 is a hinged seat, 29 is a limiting block, 30 is a connecting plate, 31 is a cross shaft, 32 is an arc plate, and 33 is a plastic layer. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail in conjunction with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The technical solutions of the present invention are described in detail below in conjunction with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0028] like Figure 1As shown in FIG. 8 , the present invention provides a reference circle marking device for large flange processing, comprising a base 1, wherein a clamping assembly is arranged at the center of the upper end surface of the base 1, and the clamping assembly comprises two symmetrical clamping plates 11, and a workpiece 12 is clamped by the relative movement of the two clamping plates 11; a horizontal beam 5 is arranged above the clamping assembly, and the beam 5 is connected to the upper end surface of the base 1 through a lifting assembly; a rotating assembly is arranged in the middle of the beam 5, and a horizontal circular plate 15 is rotatably arranged at the lower end of the rotating assembly, and an auxiliary marking assembly is arranged on the circular plate 15, and the auxiliary marking assembly comprises a fork 16, the upper end of the fork 16 is connected to the circular plate 15, and a vertical rotating shaft 22 is arranged at the lower end of the fork 16, and an arc plate 32 is arranged at the lower end of the rotating shaft 22, and a plastic layer 33 is arranged on the outer side of the arc plate 32.

[0029] The base 1 is a circular plate-shaped structure arranged horizontally.

[0030] The clamping assembly further includes a workbench 6 , a moving seat 10 , a bidirectional screw rod 8 , a first motor 9 , and a moving seat 10 .

[0031] The workbench 6 is a horizontally arranged circular plate-like structure. The workbench 6 is fixedly arranged at the center of the upper end surface of the base 1, and the workbench 6 is coaxially arranged with the base 1. A slide groove 7 is arranged at the center of the upper end surface of the workbench 6, and the slide groove 7 is arranged along the radial direction of the workbench 6. A bidirectional screw 8 is rotatably arranged inside the slide groove 7, and two sections of external threads with opposite rotation directions are arranged on the outer side surface of the bidirectional screw 8. A first motor 9 is also arranged on the upper end surface of the workbench 6, and the output shaft of the first motor 9 is transmission-connected with one end of the bidirectional screw 8, and the bidirectional screw 8 is driven to rotate inside the slide groove 7 by the first motor 9. A moving seat 10 is respectively screwed on the two sections of the external threads of the bidirectional screw 8, and the outer side surfaces of the two sides of the moving seat 10 are respectively in sliding contact with the inner walls of the two sides of the slide groove 7. A clamping plate 11 is fixedly arranged on the upper end of each moving seat 10, and the clamping plate 11 is a vertically arranged square plate-like structure, and the clamping plate 11 is perpendicular to the axis of the bidirectional screw 8.

[0032] The lifting assembly includes two columns 2 and two oil cylinders 4. The two vertical columns 2 are respectively fixed on the upper end surfaces of the base 1 on both sides of the workbench 6, and the two columns 2 are respectively arranged on both sides of the slide 7 along the length direction. A vertical guide groove 3 is respectively arranged on the end surfaces of the two columns 2 on one side opposite to each other, and the two ends of the crossbeam 5 extend into the guide groove 3 of the two columns 2 respectively. An oil cylinder 4 is respectively fixedly arranged on the upper end of each column 2, and the cylinder body of the oil cylinder 4 is fixedly connected to the upper end surface of the column 2. The piston rod of the oil cylinder 4 extends vertically downward into the guide groove 3, and the piston rods of the two oil cylinders 4 are respectively fixedly connected to the two ends of the crossbeam 5. The lifting and lowering of the crossbeam 5 is achieved by the synchronous extension and retraction of the two oil cylinders 4.

[0033] The rotating assembly further includes a second motor 13 and a reducer 14. The second motor 13 is fixedly arranged in the middle of the crossbeam 5, and the reducer 14 is fixedly arranged at the lower end of the second motor 13. The output shaft of the second motor 13 is connected to the input shaft of the reducer 14, and the output shaft of the reducer 14 is vertically downward, and the output shaft of the reducer 14 is fixedly connected to the center of the circular plate 15. The circular plate 15 is a circular plate-shaped structure arranged horizontally.

[0034] The auxiliary marking assembly also includes an upper connecting rod 18. A mounting hole is provided on the circular plate 15 along its radial direction, and the upper connecting rod 18 is inserted inside the mounting hole, and external threads are provided at both ends of the outer side of the upper connecting rod 18. The shift fork 16 is a U-shaped rod-shaped structure with an opening facing upward, and a guide opening 17 is provided at both ends of the upper side of the shift fork 16, and the guide opening 17 is a waist-shaped groove structure, and the length direction of the guide opening 17 is vertically arranged. The two ends of the upper connecting rod 18 are respectively arranged inside the guide openings 17 at the two ends of the upper side of the shift fork 16, and the two ends of the upper connecting rod 18 are respectively screwed with an anti-slip nut, which prevents the upper connecting rod 18 from slipping out from the two ends of the upper side of the shift fork 16 by the anti-slip nuts at both ends, and the two ends of the upper connecting rod 18 can slide up and down inside the guide openings 17 at the two ends of the upper side of the shift fork 16.

[0035] A circular positioning seat 19 is fixedly provided at the lower end of the reducer 14, and the axis of the positioning seat 19 is kept coincident with the axis of the output shaft of the reducer 14. A concave circular positioning groove is provided at the lower end surface of the positioning seat 19, and a circular first magnetic block 20 is fixedly provided at the inner top surface of the positioning groove. Second magnetic blocks 21 are fixedly provided at the upper ends of the fork 16. When the fork 16 moves upward until its upper ends are inserted into the positioning grooves of the positioning seat 19, the first magnetic block 20 and the two second magnetic blocks 21 are magnetically attracted to each other, so that the fork 16 is fixed to the reducer 14. At this time, the height of the fork 16 is fixed, and the fork 16 can rotate horizontally inside the positioning groove; when the fork 16 moves downward until its upper ends are out of the positioning grooves of the two positioning seats 19, the first magnetic block 20 and the second magnetic block 21 are separated from each other, so that the fork 16 is separated from the reducer 14.

[0036] A square connecting hole is provided in the middle of the lower side of the shift fork 16, and the rotating shaft 22 is a vertically arranged square rod-shaped structure, and the upper end of the rotating shaft 22 is inserted into the connecting hole of the shift fork 16. Positioning plates 24 and supporting plates 25 are respectively sleeved on the outer sides of the rotating shaft 22 located on the upper and lower sides of the connecting hole, and the positioning plates 24 and the supporting plates 25 are respectively in contact with the upper and lower ends of the middle of the lower side of the shift fork 16. A row of inner positioning holes 23 are equidistantly provided on the rotating shaft 22 along its axial direction. Outer positioning holes are provided on the side walls of the positioning plates 24 and the supporting plates 25 along the radial direction. When the outer positioning holes on the positioning plate 24 and the supporting plate 25 are aligned with the two adjacent inner positioning holes 23 on the rotating shaft 22, the locking bolts are respectively passed through the corresponding outer positioning holes and inner positioning holes 23 and then screwed with locking nuts, thereby fixing the positioning plate 24 and the supporting plate 25 on the rotating shaft 22, and fixing the rotating shaft 22 and the shift fork 16 through the positioning plate 24 and the supporting plate 25. By matching the outer positioning holes on the positioning plate 24 and the supporting rod with the two different adjacent inner positioning holes 23 on the rotating shaft 22, the relative position of the rotating shaft 22 and the shift fork 16 can be adjusted.

[0037] A horizontal lower connecting rod 26 is fixedly arranged at the lower end of the rotating shaft 22, the middle part of the lower connecting rod 26 is fixedly connected to the lower end of the rotating shaft 22, and the lower connecting rod 26 is kept parallel to the upper connecting rod 18. A fastening bolt is screwed at the center of the end surface of each end of the lower connecting rod 26. A square limiting groove 27 is respectively arranged at the lower side of each end of the outer side surface of the lower connecting rod 26.

[0038] A connecting plate 30 is arranged below the lower end of the rotating shaft 22. The connecting plate 30 is a horizontally arranged circular plate-shaped structure, and the connecting plate 30 is arranged coaxially with the rotating shaft 22. Two symmetrical hinge seats 28 are fixedly arranged on the upper end surface of the connecting plate 30. A hinge hole is arranged inside each hinge seat 28. The hinge hole is a waist-shaped groove structure, and the length direction of the hinge hole is the vertical direction. A square limit block 29 is fixedly arranged at the lower end of each hinge hole. The two ends of the lower connecting rod 26 are respectively inserted into the hinge holes of the two hinge seats 28.

[0039] A cross shaft 31 is fixedly arranged at the lower end of the connecting plate 30, and the cross shaft 31 includes a fixed cylinder and four fixed rods. The fixed cylinder is a cylindrical structure with openings at both ends. The upper end opening of the fixed cylinder is connected to the lower end surface of the connecting plate 30. A circle of fixing bolts are respectively inserted at the outer edge of the connecting plate 30. The fixing bolts pass through the connecting plate 30 and are screwed to the upper end opening of the fixed cylinder, thereby fixing the fixed cylinder and the connecting plate 30, and then fixing the cross shaft 31 and the connecting plate 30. Four fixing rods are fixedly arranged at the middle height of the outer cylindrical surface of the fixed cylinder. The four fixing rods are arranged in a circular array along the axis of the fixed cylinder, and the fixing rods are arranged along the radial direction of the fixed cylinder.

[0040] The arc plate 32 is a conical cylindrical structure with openings at both ends, and the outer diameter of the upper opening of the arc plate 32 is larger than the outer diameter of the lower opening of the arc plate 32. The arc plate 32 is located outside the connecting plate 30, and the arc plate 32 is coaxially arranged with the connecting plate 30. One end of the four fixing rods is fixedly connected to the outer cylindrical surface of the fixing cylinder, and the other end of the four fixing rods is fixedly connected to the middle height of the inner wall of the arc plate 32. The plastic layer 33 is fitted on the outer surface of the arc plate 32, and the upper end of the plastic layer 33 is fixedly connected to the upper end of the arc plate 32 by bolts.

[0041] The present invention also proposes a method for using a reference circle scribing device for large flange processing, comprising the following steps:

[0042] Step 1: First, connect the upper ends of the fork 16 to the two ends of the circular plate 15 through the upper connecting rod 18. At this time, both ends of the upper connecting rod 18 are located at the inner upper part of the two guide openings 17 of the fork 16, and both ends of the upper connecting rod 18 can slide up and down inside the two guide openings 17 of the fork 16. Then, install the rotating shaft 22 according to the height of the device, install the rotating shaft 22 at the lower end of the fork 16 through the positioning plate 24 and the supporting plate 25, and then insert the two ends of the lower connecting rod 26 into the hinge holes of the two hinge seats 28 respectively. At this time, both ends of the lower connecting rod 26 are located at the inner upper part of the hinge holes of the two hinge seats 28, and both ends of the lower connecting rod 26 can slide up and down inside the two hinge holes. Then install the cross shaft 31 on the lower end surface of the connecting plate 30, and then install the arc plate 32 on the outer side of the cross shaft 31, and then install the plastic layer 33 on the arc plate 32. Then, the piston rods of the two oil cylinders 4 are controlled to contract synchronously, and the two oil cylinders 4 drive the crossbeam 5 to rise, and the crossbeam 5 drives the rotating assembly and the auxiliary marking assembly to rise as a whole.

[0043] Step 2: After the rotating assembly and the auxiliary marking assembly rise, the circular workpiece 12 is grabbed by the grabber and placed horizontally on the workbench 6, and then all electrical equipment are connected to the wires and powered on. Then the first motor 9 is started, and the bidirectional screw 8 is controlled by the first motor 9 to rotate in the slide 7. Since the two sections of the external threads of the bidirectional screw 8 with opposite rotation directions are respectively screwed with the two moving seats 10, the two moving seats 10 are driven to approach each other inside the slide 7, and the two moving seats 10 drive the two clamps 11 to approach each other until the two clamps 11 are in contact with the workpiece 12, so that the workpiece 12 is clamped and fixed by the two clamps 11.

[0044] Step 3: After the workpiece 12 is clamped and fixed, the piston rods of the two oil cylinders 4 are controlled to extend synchronously, and the two oil cylinders 4 drive the cross beam 5 to descend, thereby controlling the rotation assembly and the auxiliary marking assembly to descend rapidly, and the cross shaft 31 and the arc plate 32 at the lower end are synchronously descended accordingly. During the descending process, the center of gravity of the arc plate 32 and the plastic layer 33 is always guaranteed to be vertically downward, so as to ensure that the plastic layer 33 is in uniform contact with the workpiece 12. When the plastic layer 33 is initially in contact with the workpiece 12, the cross beam 5 continues to descend, and the lower connecting rod 26 slides downward inside the hinge hole until the limit block 29 inside the hinge hole is engaged with the limit grooves 27 at both ends of the lower connecting rod 26, thereby realizing the mutual limitation of the lower connecting rod 26 and the hinge seat 28, and realizing the clamping and fixing of the lower connecting rod 26 and the rotating shaft 22. As the crossbeam 5 continues to descend, the upper connecting rod 18 slides downward inside the two guide openings 17 of the fork 16, at which time the rotating shaft 22 and the fork 16 remain fixed, and the circular plate 15, the upper connecting rod 18 and the positioning seat 19 slide downward relative to the fork 16 until the upper ends of the fork 16 are respectively inserted into the positioning grooves of the two positioning seats 19, and the first magnetic block 20 and the second magnetic block 21 are magnetically attracted to each other, thereby fixing the fork 16 to the reducer 14. At this time, tighten the locking nuts at both ends of the upper connecting rod 18, and tighten the fastening bolts at both ends of the lower connecting rod 26.

[0045] Step 4: When the upper end of the shift fork 16 is inserted into the positioning groove, the upper ends of both sides of the shift fork 16 maintain sliding contact with the inner wall of the positioning groove, so that the shift fork 16 and the rotating shaft 22 are both in a vertical state. At this time, the second motor 13 drives the circular plate 15 to rotate through the reducer 14, the circular plate 15 drives the shift fork 16 to rotate, the shift fork 16 drives the rotating shaft 22 to rotate, the rotating shaft 22 drives the connecting plate 30 to rotate through the mutual cooperation between the lower connecting rod 26 and the hinge seat 28, and the connecting plate 30 drives the arc plate 32 and the plastic layer 33 to rotate through the cross shaft 31. Since the upper ends of both sides of the shift fork 16 maintain sliding contact with the inner wall of the positioning groove, it is ensured that the rotating shaft 22 can rotate stably, thereby controlling the plastic layer 33 to remain stable during rotation, avoiding shaking during rotation and affecting the quality of marking. The plastic layer 33 rubs against the inner surface of the workpiece 12 when rotating. Under the action of gravity and rotation, the irregular part of the inner wall of the workpiece 12 will gradually consume the corresponding part of the plastic layer 33. When 3 / 4 of the plastic layer 33 is in contact with the inner wall of the workpiece 12, this tangent line is the most economical inner circle processing reference line. Then stop the second motor 13, use a marking needle to draw a circle along the line where the plastic layer 33 and the workpiece 12 are in contact, and complete the marking of the roundness reference line; then cut off the power of all electrical equipment.

[0046] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A reference circle marking device for large flange processing, characterized in that: The invention comprises a base (1), wherein a clamping assembly is arranged at the center of the upper end surface of the base (1), the clamping assembly comprises two symmetrical clamping plates (11), and the workpiece (12) is clamped by the relative movement of the two clamping plates (11); a horizontal beam (5) is arranged above the clamping assembly, and the beam (5) is connected to the upper end surface of the base (1) through a lifting assembly; a rotating assembly is arranged in the middle of the beam (5), and a horizontal circular plate (15) is rotatably arranged at the lower end of the rotating assembly, and an auxiliary marking assembly is arranged on the circular plate (15), and the auxiliary marking assembly comprises a shift fork (16), the upper end of the shift fork (16) is connected to the circular plate (15), and a vertical rotating shaft (22) is arranged at the lower end of the shift fork (16), and an arc plate (32) is arranged at the lower end of the rotating shaft (22), and a plastic layer (33) is arranged on the outer side of the arc plate (32); The rotating assembly further comprises a second motor (13) and a reducer (14); the second motor (13) is fixedly arranged at the middle of the crossbeam (5), the reducer (14) is fixedly arranged at the lower end of the second motor (13), the output shaft of the second motor (13) is connected to the input shaft of the reducer (14), the output shaft of the reducer (14) is vertically downward, and the output shaft of the reducer (14) is fixedly connected to the center of the circular plate (15); The auxiliary marking assembly further comprises an upper connecting rod (18); a mounting hole is provided on the circular plate (15) along its radial direction, the upper connecting rod (18) is inserted into the mounting hole, and external threads are respectively provided at both ends of the outer side surface of the upper connecting rod (18); the shift fork (16) is a U-shaped rod-shaped structure with an opening facing upward, and a guide opening (17) is respectively provided at both ends of the upper side of the shift fork (16); the two ends of the upper connecting rod (18) are respectively arranged inside the guide openings (17) at both ends of the upper side of the shift fork (16), and the two ends of the upper connecting rod (18) are respectively screwed with an anti-drop nut; A circular ring-shaped positioning seat (19) is fixedly provided at the lower end of the reducer (14); a concave circular ring-shaped positioning groove is provided at the lower end surface of the positioning seat (19); a circular ring-shaped first magnetic block (20) is fixedly provided at the inner top surface of the positioning groove; and second magnetic blocks (21) are respectively fixedly provided at both ends of the upper side of the shift fork (16); A square connecting hole is provided in the middle of the lower side of the shift fork (16), and the upper end of the rotating shaft (22) is inserted into the connecting hole of the shift fork (16); a positioning plate (24) and a supporting plate (25) are respectively sleeved on the outer side of the rotating shaft (22) located at the upper and lower sides of the connecting hole, and the positioning plate (24) and the supporting plate (25) are respectively in contact with the upper and lower ends of the middle of the lower side of the shift fork (16); a row of inner positioning holes (23) are equidistantly provided on the rotating shaft (22) along its axial direction; the positioning plate (24) and the supporting plate (25) are both annular structures. , outer positioning holes are provided on the side walls of the positioning plate (24) and the supporting plate (25) along the radial direction; when the outer positioning holes on the positioning plate (24) and the supporting plate (25) are aligned with the two adjacent inner positioning holes (23) on the rotating shaft (22), locking bolts are respectively passed through the corresponding outer positioning holes and inner positioning holes (23) and then screwed with locking nuts, thereby fixing the positioning plate (24) and the supporting plate (25) on the rotating shaft (22), and fixing the rotating shaft (22) and the shift fork (16) through the positioning plate (24) and the supporting plate (25); A horizontal lower connecting rod (26) is fixedly arranged at the lower end of the rotating shaft (22), the middle part of the lower connecting rod (26) is fixedly connected to the lower end of the rotating shaft (22), and the lower connecting rod (26) is kept parallel to the upper connecting rod (18); a fastening bolt is screwed at the center of the end surface of each end of the lower connecting rod (26); a square limiting groove (27) is respectively arranged at the lower side of both ends of the outer side surface of the lower connecting rod (26); a connecting plate (30) is arranged below the lower end of the rotating shaft (22), and two symmetrical hinge seats (28) are fixedly arranged on the upper end surface of the connecting plate (30), a hinge hole is respectively arranged inside each hinge seat (28), and a square limiting block (29) is respectively fixedly arranged at the lower end of the inner part of each hinge hole; the two ends of the lower connecting rod (26) are respectively inserted into the hinge holes of the two hinge seats (28); A cross shaft (31) is fixedly arranged at the lower end of the connecting plate (30), and the cross shaft (31) includes a fixed cylinder and four fixed rods; the fixed cylinder is a cylindrical structure with upper and lower ends opened, the upper end opening of the fixed cylinder is connected to the lower end surface of the connecting plate (30), and a circle of fixing bolts are respectively inserted at the outer edge of the connecting plate (30), and the fixing bolts pass through the connecting plate (30) and are screwed to the upper end opening of the fixed cylinder, thereby fixing the fixed cylinder and the connecting plate (30) and further fixing the cross shaft (31) and the connecting plate (30); four fixing rods are fixedly arranged at the middle height of the outer cylindrical surface of the fixed cylinder, and the four fixing rods are arranged in a circular array along the axis of the fixed cylinder, and the fixing rods are arranged along the radial direction of the fixed cylinder.

2. The reference circle scribing device for large flange processing according to claim 1 is characterized in that: The clamping assembly further comprises a workbench (6), a movable seat (10), a bidirectional screw rod (8), a first motor (9), and a movable seat (10); the workbench (6) is fixedly arranged at the center of the upper end surface of the base (1); a slide groove (7) is arranged at the center of the upper end surface of the workbench (6); a bidirectional screw rod (8) is rotatably arranged inside the slide groove (7); a first motor (9) is also arranged on the upper end surface of the workbench (6); an output shaft of the first motor (9) is transmission-connected to one end of the bidirectional screw rod (8); a movable seat (10) is respectively screwed on two sections of the external thread of the bidirectional screw rod (8); and a clamping plate (11) is respectively fixedly arranged on the upper end of each movable seat (10).

3. The reference circle scribing device for large flange machining according to claim 2 is characterized in that: The lifting assembly comprises two columns (2) and two oil cylinders (4). The two vertical columns (2) are respectively fixedly arranged on the upper end surfaces of the base (1) on both sides of the workbench (6). A vertical guide groove (3) is respectively arranged on the end surfaces on the opposite sides of the two columns (2). The two ends of the cross beam (5) respectively extend into the guide grooves (3) of the two columns (2). An oil cylinder (4) is respectively fixedly arranged on the upper end of each column (2). The piston rod of the oil cylinder (4) extends vertically downward into the guide groove (3), and the piston rods of the two oil cylinders (4) are respectively fixedly connected to the two ends of the cross beam (5).

4. The reference circle scribing device for large flange machining according to claim 1, characterized in that: The arc plate (32) is a conical cylindrical structure with openings at both ends, the outer diameter of the upper opening of the arc plate (32) being larger than the outer diameter of the lower opening of the arc plate (32); the arc plate (32) is located outside the connecting plate (30), and the arc plate (32) and the connecting plate (30) are coaxially arranged; one end of the four fixing rods is fixedly connected to the outer cylindrical surface of the fixing cylinder, and the other ends of the four fixing rods are fixedly connected to the middle height of the inner wall of the arc plate (32); the plastic layer (33) is fitted on the outer surface of the arc plate (32), and the upper end of the plastic layer (33) is fixedly connected to the upper end of the arc plate (32) by bolts.

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