Automatic chamfering device for side wall hole of large depth-diameter ratio pipe fitting

Abstract

The application discloses a kind of big deep-diameter ratio pipe fittings side wall hole automatic chamfering device, including machine body main body, walking unit, processing unit and positioning unit, the processing unit is connected positioning unit, and positioning unit is connected with machine body main body by walking unit.The application adopts the positioning mode of mechanical positioning pin and positioning sensor combination, cooperates linear feed module, realizes the simple structure, accurate and reliable axial and circumferential positioning.The application adopts multi-axis joint control, programs control elastic ball type grinding rod's spindle speed, spindle forward and reverse, grinding depth and axial reciprocating movement, by controlling elastic ball type grinding rod position, realize the accurate chamfering processing of big deep-diameter ratio pipe fittings different position side wall hole edge.The application can automatically process chamfering size, ensure chamfering precision, also avoid the damage to processing surface.The application can evaluate side wall hole edge chamfering size by setting endoscope above grinding rod.

Description

TECHNICAL FIELD

[0001] The application relates to a large-depth-diameter-ratio pipe processing device, in particular to an automatic chamfering device for a hole in a side wall of a large-depth-diameter-ratio pipe. BACKGROUND

[0002] The large-depth-diameter-ratio pipe (hereinafter referred to as a pipe) refers to a part with a length divided by a minimum inner diameter greater than 10, such as a barrel of a cannon, a turbine shaft, an air duct in an aero-engine, and a wheel shaft of an aircraft landing gear. Such pipes work in a high-temperature and high-pressure environment, and a large number of small-diameter holes need to be formed in the inner wall of the pipe. The holes are formed from the outside, and there are many burrs on the hole edges of the side wall of the pipe. In the traditional way, a scraper is used to remove material and chamfer the hole edges. However, since the large-depth-diameter-ratio pipe is usually made of high-strength steel which is difficult to machine, and the hole position is deep in the large-depth-diameter-ratio pipe, manual operation is not only low in efficiency and high in labor intensity, but also difficult to achieve high-precision machining. The patent CN202022210176.3 adopts a platform-type horizontal machining method, which adjusts the length of the main shaft and uses a scraper or a plurality of cutters to chamfer. This method can only realize the axial positioning and machining of chamfering, and has the problems of large machining platform size, high cost, low efficiency in clamping the pipe, etc. The patent CN201620913966.9 designs a chamfering machining cutter; and the patent CN202320599315.7 designs a cutter clamping main shaft structure, which uses an adjusting assembly to make the cutter deep into the pipe, and uses a scraper or a chamfering cutter to chamfer. However, this structure only has an axial feeding adjusting device for the pipe, and the tail end needs to be fixed on the machine tool support, which greatly limits the depth of the pipe. Moreover, the long main shaft has small rigidity, and the top end of the main shaft deforms greatly, which causes the cutter to let go, reduces the material removal force, and cannot quickly and accurately perform chamfering precision machining. SUMMARY

[0003] In view of the problems of lack of hole edge chamfering device in the inner cavity of the large-depth-diameter-ratio pipe, low machining precision, low efficiency, and low automation degree, the application provides an automatic chamfering device for a hole in a side wall of a large-depth-diameter-ratio pipe, which can chamfer the hole edges of the large-depth-diameter-ratio pipe, has high automation degree, is portable, has high machining precision, and has high machining efficiency.

[0004] To achieve the above-mentioned purpose, the technical scheme of the application is as follows.

[0005] An automatic chamfering device for a hole in a side wall of a large-depth-diameter-ratio pipe, comprising a main body, a walking unit, a machining unit, and a positioning unit, wherein the machining unit is connected to the positioning unit, and the positioning unit is connected to the main body through the walking unit; hereinafter, the large-depth-diameter-ratio pipe is referred to as a pipe.

[0006] The main body includes a cylinder, a left end cover, connecting strips, an upper shell, a lower shell, a right end cover, a pull ring, and a plug. The pull ring and plug are fixed to the right end cover. The left and right ends of the cylinder are connected to the left and right end covers, respectively. There are two connecting strips, with their left and right ends connected to the left and right end covers, respectively. The two connecting strips are arranged with a gap between them, and their center lines are located in the horizontal plane. The upper shell is fixedly connected across the upper side of the two connecting strips, and the lower shell is fixedly connected across the lower side of the two connecting strips.

[0007] The walking unit includes a drive motor I, a drive motor II, a support for drive motor I, a pressure plate, a tensioning mechanism I, a tensioning mechanism II, a swing bracket, a drive wheel I, a drive wheel II, a driven wheel I, and a driven wheel II;

[0008] There are two driven wheels I, which are symmetrically installed on the front and rear sides of the left end of the upper housing via a connecting shaft.

[0009] There are two driven wheels II, which are symmetrically installed on the front and rear sides of the left end of the lower housing via a connecting shaft.

[0010] There are two drive wheels I, which are symmetrically mounted on the front and rear sides of the right end of the upper housing via the output shaft of drive motor I.

[0011] There are two drive wheels II, which are symmetrically installed on the front and rear sides of the right end of the upper housing via the output shaft of drive motor II.

[0012] The drive motor I is connected to the drive motor I support, and the top of the drive motor I support is fixedly connected to the upper housing;

[0013] The drive motor II is connected to the pressure plate. The right end of the pressure plate is connected to the lower housing via a pin, and the left end is connected to the tensioning mechanism II.

[0014] The tensioning mechanism II includes a spring and a pressure rod, with the spring nested on the pressure rod;

[0015] The lower end of the spring in the tensioning mechanism II is connected to the pressure plate, the upper end of the spring is in contact with the nut, the upper end of the pressure rod is connected to the nut by a thread, and the lower end of the pressure rod is fixedly connected to the lower housing.

[0016] The tensioning mechanism I and the tensioning mechanism II have the same structure;

[0017] The lower end of the spring in tensioning mechanism I is connected to the swing bracket, the upper end of the spring is in contact with the nut, the upper end of the pressure rod is connected to the nut by a thread, and the lower end of the pressure rod is fixedly connected to the lower housing.

[0018] The processing unit includes a spindle motor, a spindle motor support, a spindle bracket, a spherical grinding rod, a bearing, an endoscope, a support, a mounting block, an electric push rod, an indexing plate, an adapter bracket, and a linear module.

[0019] The bottom of the linear module is fixed to the lower housing. The top of the linear module is connected to the indexing plate via an adapter bracket. The indexing plate is connected to the spindle bracket. The left end of the spindle bracket is connected to the spindle motor support via a bearing. The spindle motor support is connected to the spindle motor. The spindle motor is connected to the spherical grinding rod via a clamp. A mounting block is fixed on the right crossbeam of the spindle bracket. The mounting block is connected to the electric push rod. The bottom of the electric push rod is connected to the right side of the spindle motor support. The endoscope is fixed to the right crossbeam of the spindle bracket via a support.

[0020] The adapter bracket is L-shaped, with its short side connected to the indexing plate to transmit rotational power, and its long side connected to the top of the linear module to increase structural rigidity; the spindle motor support adjusts the clamping force on the spindle motor through bolts, thereby fixing the spindle motor.

[0021] The angle between the axis of the main spindle motor and the central axis of the cylinder is 30° to 60°.

[0022] The positioning unit includes a positioning pin, a head cover, a positioning sensor, a reducer, and an indexing motor. The size of the positioning pin matches the size of the side wall hole. During operation, the positioning pin is inserted into the side wall hole from the outside in, with its inner end extending out of the inner wall of the pipe. The head cover is mounted on the spindle support. The positioning sensor is fixed to the right end crossbeam of the spindle support via a bracket. The indexing motor is connected to the indexing plate via the reducer. The outer shape of the head cover is a stepped cylinder, and the difference between the outer radius of the right cylinder and the outer radius of the left cylinder is greater than the diameter of the inner end of the positioning pin.

[0023] When the inner end of the locating pin contacts the stepped surface on the right side of the head cover, and the diameter of the spherical grinding rod is at its maximum size, the distance from the rotation center of the spindle motor support to the stepped surface on the right side of the head cover is greater than the distance from the rotation center to the tip of the spherical grinding rod.

[0024] Furthermore, the lower end of the electric push rod is rotatably connected to the right end of the main spindle motor support via a rotating shaft.

[0025] Furthermore, the rotational speeds of both drive motor I and drive motor II are less than 500 r / min.

[0026] Furthermore, the pin serves as the rotation center axis of the pressure plate, and the pin is located on the right side of the drive motor II. The pressure plate is fixed to the rear of the pin.

[0027] Further, the cross-sectional shape of the upper housing is "J" shaped, and the cross-sectional shape of the lower housing is symmetrical to that of the upper housing with respect to the horizontal plane; the installation positions of the driving wheel I and the driving wheel II are symmetrical with respect to the horizontal plane; the installation positions of the driven wheel I and the driven wheel II are symmetrical with respect to the horizontal plane.

[0028] Further, the positioning sensor adopts an optoelectronic switch or a laser displacement sensor.

[0029] Further, the clamping end of the main shaft motor is connected to the shank of the spherical grinding rod through a collet chuck.

[0030] Further, the linear travel length of the linear module is greater than the maximum distance between two adjacent side wall holes in the axial direction of the pipe fitting.

[0031] Further, both the driving motor I and the driving motor II are DC deceleration speed-regulating biaxial motors, that is, the connection line of the two output shafts is perpendicular to the axis of the motor.

[0032] Further, the connecting bar is a square pipe.

[0033] The rotation speed range of the main shaft motor is stepless speed regulation.

[0034] The bearing connecting the main shaft motor support and the main shaft bracket is located at the bottom of the main shaft motor support.

[0035] The measurement range of the positioning sensor is greater than the maximum value of half of the difference between the diameter of the series of pipe fittings to be measured and the length dimension of the electric push rod.

[0036] The main shaft motor has a forward and reverse rotation function.

[0037] The spherical grinding rod is an elastic rod type.

[0038] The electric push rod is connected to the mounting block through a pin shaft.

[0039] Both the endoscope and the positioning sensor are firmly mounted on the support by set screws.

[0040] The installation position of the endoscope is directly above the spherical grinding head, and is used to observe the chamfer quality of the side wall hole edge after processing. Its optimal focal length range covers the descending distance of the spherical grinding head.

[0041] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0042] 1. The present invention adopts a positioning method combining a mechanical positioning pin and a positioning sensor, and cooperates with a linear feed module to achieve simple, accurate and reliable axial and circumferential positioning. [[ID=2. This invention employs multi-axis combined control, programming to control the spindle speed, forward and reverse rotation, grinding depth, and axial reciprocating movement of the elastic spherical grinding rod. By controlling the position of the elastic spherical grinding rod, precise chamfering of the sidewall holes at different locations on pipe fittings with large depth-to-diameter ratios is achieved. This control method can automatically process the chamfer dimensions, ensuring chamfering accuracy and avoiding damage to the processed surface.

[0044] 3. This invention uses a spherical grinding rod for chamfering, enabling rapid production of high-precision chamfers. By mounting the electric push rod on the spindle support, the tilting stroke of the spherical grinding rod can be shortened, improving structural rigidity and chamfering efficiency. The use of a tensioning mechanism in conjunction with the traveling wheel mounting rod allows for adjustable extension distances between the driving and driven wheels, making it suitable for operation within the cavities of pipes with varying inner diameters and large depth-to-diameter ratios. An endoscope positioned above the grinding rod allows for evaluation of the chamfer dimensions of the sidewall hole edges.

[0045] 4. The overall weight of the present invention is less than 10kg, making it a portable automatic processing device.

[0046] 5. In summary, the present invention solves the problems of low surface quality, low efficiency, and difficulty in surface observation when chamfering sidewall holes of pipe fittings with different inner diameters and large depth-to-diameter ratios. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the operation of the present invention;

[0048] Figure 2 yes Figure 1 The right view;

[0049] Figure 3 This is a schematic diagram of the overall structure of the present invention;

[0050] Figure 4 This is a schematic diagram of the walking unit structure;

[0051] Figure 5 This is a schematic diagram of the processing unit structure;

[0052] Figure 6 This is a schematic diagram of the positioning unit structure;

[0053] Figure 7 This is a schematic diagram of the observation facility;

[0054] Figure 8 This is a front view of the observation facility;

[0055] Figure 9 This is a schematic diagram of the sidewall hole positioning method;

[0056] Figure 10 This is a schematic diagram of the tensioning mechanism.

[0057] In the diagram: 1. Pipe fitting; 2. Locating pin; 3. Driven wheel I; 4. Driven wheel I; 5. Pull ring; 6. Driven wheel II; 7. Cylinder; 8. Driven wheel II; 9. Head cover; 10. Spherical grinding rod; 11. Side wall hole; 12. Right end cover; 13. Plug; 14. Spindle motor; 15. Spindle motor support; 16. Left end cover; 17. Indexing motor; 18. Upper housing; 19. Lower housing; 20. Connecting strip; 21. Indexing plate. 22. Spindle support; 23. Bearing; 24. Spring; 25. Pressure plate; 26. Drive motor I support; 27. Drive motor I; 28. Drive motor II; 29. ​​Pressure rod; 30. Swing bracket; 31. Reducer; 32. Adapter bracket; 33. Linear module; 34. Endoscope; 35. Positioning sensor; 36. Mounting block; 37. Support; 38. Electric push rod; 39. Connecting shaft; 40. Nut; 41. Pin. Detailed Implementation

[0058] The invention will now be further described with reference to the accompanying drawings. Figures 1-9 As shown, an automatic chamfering device for sidewall holes of a pipe fitting with a large depth-to-diameter ratio includes a main body, a traveling unit, a processing unit, and a positioning unit. The processing unit is connected to the positioning unit, and the positioning unit is connected to the main body through the traveling unit. The pipe fitting with a large depth-to-diameter ratio is hereinafter referred to as pipe fitting 1.

[0059] The main body includes a cylinder 7, a left end cover 16, connecting strips 20, an upper shell 18, a lower shell 19, a right end cover 12, a pull ring 5, and a plug 13. The pull ring 5 and the plug 13 are fixed to the right end cover 12. The left and right ends of the cylinder 7 are connected to the left end cover 16 and the right end cover 12, respectively. There are two connecting strips 20, with their left and right ends connected to the left end cover 16 and the right end cover 12, respectively. The two connecting strips 20 are arranged with a gap between them, and their center lines are located in the horizontal plane. The upper shell 18 is fixedly connected across the upper side of the two connecting strips 20, and the lower shell 19 is fixedly connected across the lower side of the two connecting strips 20.

[0060] The walking unit includes a drive motor I 27, a drive motor II 28, a drive motor I support 26, a pressure plate 25, a tensioning mechanism I, a tensioning mechanism II, a swing bracket 30, a drive wheel I 4, a drive wheel II 6, a driven wheel I 3, and a driven wheel II 8;

[0061] There are two driven wheels I3, which are symmetrically installed on the front and rear sides of the left end of the upper housing 18 via connecting shaft 39.

[0062] There are two driven wheels II8, which are symmetrically installed on the front and rear sides of the left end of the lower housing 19 via connecting shaft 39.

[0063] There are two drive wheels I4, which are symmetrically installed on the front and rear sides of the right end of the upper housing 18 via the output shaft of the drive motor I27.

[0064] There are two drive wheels II6, which are symmetrically installed on the front and rear sides of the right end of the upper housing 18 via the output shaft of the drive motor II28.

[0065] The drive motor I 27 is connected to the drive motor I support 26, and the top of the drive motor I support 26 is fixedly connected to the upper housing 18;

[0066] The drive motor II 28 is connected to the pressure plate 25. The right end of the pressure plate 25 is connected to the lower housing 19 via a pin 41, and the left end is connected to the tensioning mechanism II.

[0067] The tensioning mechanism II includes a spring 24 and a pressure rod 29, with the spring 24 nested on the pressure rod 29;

[0068] The lower end of the spring 24 of the tensioning mechanism II is connected to the pressure plate 25, the upper end of the spring 24 is in contact with the nut 40, the upper end of the pressure rod 29 is connected to the nut 40 by a thread, and the lower end of the pressure rod 29 is fixedly connected to the lower housing 19.

[0069] The tensioning mechanism I and the tensioning mechanism II have the same structure;

[0070] The lower end of the spring 24 of the tensioning mechanism I is connected to the swing bracket 30, the upper end of the spring 24 is in contact with the nut 40, the upper end of the pressure rod 29 is connected to the nut 40 by a thread, and the lower end of the pressure rod 29 is fixedly connected to the lower housing 19.

[0071] The processing unit includes a spindle motor 14, a spindle motor support 15, a spindle bracket 22, a spherical grinding rod 10, a bearing 23, an endoscope 34, a support 37, a mounting block 36, an electric push rod 38, an indexing plate 21, an adapter bracket 32, and a linear module 33.

[0072] The bottom of the linear module 33 is fixed to the lower housing 19. The top of the linear module 33 is connected to the indexing plate 21 through the adapter bracket 32. The indexing plate 21 is connected to the spindle bracket 22. The left end of the spindle bracket 22 is connected to the spindle motor support 15 through the bearing 23. The spindle motor support 15 is connected to the spindle motor 14. The spindle motor 14 is connected to the spherical grinding rod 10 through the clamp. The mounting block 36 is fixed on the right crossbeam of the spindle bracket 22. The mounting block 36 is connected to the electric push rod 38. The bottom of the electric push rod 38 is connected to the right side of the spindle motor support 15. The endoscope 34 is fixed on the right crossbeam of the spindle bracket 22 through the support 37.

[0073] The adapter bracket 32 is L-shaped. Its short side is connected to the indexing plate 21 for transmitting rotational power, and its long side is connected to the top of the linear module 33 for increasing structural rigidity. The spindle motor support 15 adjusts the clamping force on the spindle motor 14 through bolts, thereby fixing the spindle motor 14.

[0074] The included angle between the axis of the spindle motor 14 and the central axis of the cylinder 7 is 30° to 60°.

[0075] The positioning unit includes a positioning pin 2, a head cover 9, a positioning sensor 35, a reducer 31, and an indexing motor 17. The size of the positioning pin 2 matches the size of the side wall hole 11. During operation, the positioning pin 2 is inserted into the side wall hole 11 from the outside to the inside, and its inner end extends out of the inner wall of the pipe fitting 1. The head cover 9 is installed on the spindle support 22. The positioning sensor 35 is fixed to the right cross beam of the spindle support 22 through a support 37. The indexing motor 17 is connected to the indexing plate 21 through the reducer 31. The outer shape of the head cover 9 is a stepped cylinder shape, and the difference between the outer radius of the right cylinder and the outer radius of the left cylinder is greater than the diameter of the inner end of the positioning pin 2.

[0076] When the inner end of the positioning pin 2 contacts the stepped surface on the right side of the head cover 9 and the diameter of the spherical grinding rod 10 is at its maximum size, the distance from the rotation center of the spindle motor support 15 to the stepped surface on the right side of the head cover 9 is greater than the distance from the rotation center to the spherical end of the spherical grinding rod 10.

[0077] Furthermore, the lower end of the electric push rod 38 is rotatably connected to the right end of the spindle motor support 15 through a rotating shaft.

[0078] Furthermore, the rotational speeds of the drive motor I and the drive motor II 28 are both less than 500 r / min.

[0079] Furthermore, the pin shaft 41 serves as the rotation center shaft of the pressing plate 25. The position of the pin shaft 41 is on the right side of the drive motor II 28, and the pressing plate 25 is fixed to the rear of the pin shaft 41.

[0080] Furthermore, the cross-sectional shape of the upper housing 18 is "shaped like the Chinese character 'ji'". The cross-sectional shape of the lower housing 19 is symmetric with that of the upper housing 18 about the horizontal plane. The installation positions of the driving wheel I 4 and the driving wheel II 6 are symmetric about the horizontal plane. The installation positions of the driven wheel I 3 and the driven wheel II 8 are symmetric about the horizontal plane.

[0081] Furthermore, the positioning sensor 35 adopts a photoelectric switch or a laser displacement sensor.

[0082] Furthermore, the clamping end of the spindle motor 14 is connected to the shank of the spherical grinding rod 10 through a collet chuck.

[0083] Furthermore, the linear stroke length of the linear module 33 is greater than the maximum distance between two sets of adjacent sidewall holes 11 in the axial direction of the pipe fitting 1.

[0084] Furthermore, both drive motor I27 and drive motor II28 are DC geared speed-regulating dual-axis motors, meaning that the line connecting the two output shafts is perpendicular to the motor axis.

[0085] Furthermore, the connecting strip 20 is a square tube.

[0086] The spindle motor 14 has a stepless speed regulation range.

[0087] The bearing 23, which connects the spindle motor support 15 and the spindle bracket 22, is located at the bottom of the spindle motor support 15.

[0088] The measurement range of the positioning sensor 35 is greater than the maximum value of half the difference between the diameter of the pipe fitting 1 to be measured and the length of the electric push rod 38.

[0089] The spindle motor 14 has forward and reverse rotation functions.

[0090] The spherical grinding rod 10 is an elastic rod.

[0091] The electric push rod 38 is connected to the mounting block 36 via a pin 41.

[0092] Both the endoscope 34 and the positioning sensor 35 are securely mounted on the support 37 using set screws.

[0093] The endoscope 34 is installed directly above the spherical grinding rod 10 and is used to observe the chamfering quality of the sidewall hole 11 after processing. Its optimal focal length range covers the descent distance of the spherical grinding head.

[0094] The working principle of this invention is as follows:

[0095] First, adjust the distance between the nut 40 in tensioning mechanism I and the pressure rod 29 to compress the spring 24 and generate a restoring force, controlling the rotation of the swing bracket 30, thereby adjusting the position of the driven wheel II 8. Similarly, adjust the distance between the nut 40 in tensioning mechanism II and the pressure rod 29 to compress the spring 24 and generate a restoring force. Compressing the spring 24 controls the rotation of the pressure plate 25, thereby adjusting the tilt of the drive motor II 28, so that the driving wheel II 6 and the driven wheel II 8 are aligned. Place the positioning pin 2 into any of the side wall holes 11 to be machined in the first ring at the top of the pipe fitting 1, and then manually press the driving wheel II 6 and the driven wheel II 8 to compress the springs in their tensioning mechanisms. Place the entire device into the pipe fitting 1 and connect the power supply. The springs of the driving wheel II 6 and the driven wheel II 8 return to their original position and maintain contact with the inner surface of the pipe fitting 1.

[0096] The device then travels inside the pipe 1 via the walking unit until the inner end of the positioning pin 2 contacts the step position on the right side of the head cover 9, thus confirming the axial positioning of the side wall hole 11, and the movement stops.

[0097] The indexing motor 17 drives the indexing plate 21, causing the spindle support 22 to rotate. The positioning sensor 35 receives light signals to determine the circumferential endpoint of the side wall hole 11. The electric push rod 38 is connected to the spindle motor support 15, adjusting the tilt angle of the spindle motor 14 and the spherical grinding rod 10 to control the grinding depth. It works in conjunction with the linear module 33 to perform high-precision chamfering of the side wall hole 11.

[0098] After processing, the entire device is manually removed using the pull ring 5. The surface of the sidewall hole 11 is photographed using an endoscope 34 before and after processing to assess the processing quality.

[0099] Since the internal dimensions of the sidewall hole 11 cannot be completely symmetrical after it is drilled from the outside, in order to achieve consistency in the chamfer dimensions of the sidewall hole 11 after machining, the spindle motor 14 has a forward and reverse function. By first rotating the ball grinding head forward to process and then reversing to repeat the same trajectory, the consistency of the chamfer dimensions on both sides of the same sidewall hole 11 can be achieved.

[0100] like Figures 1-9 As shown, the working method of the present invention includes the following steps:

[0101] A. Control the two tensioning mechanisms to tilt the pressure plate 25 and the swing bracket 30 at a certain angle, and extend the driving wheel II6 and the driven wheel II8 a certain distance.

[0102] B. Press the driven wheel II8 and the driving wheel II6 in sequence to put the device into the pipe 1 until the driving wheel is fully inside the pipe 1. At this time, the driving wheel I4, driving wheel II6, driven wheel I3 and driven wheel II8 are all in contact with the inner wall of the pipe 1.

[0103] C. Connect the device to the power supply through plug 13 and press the power button to control the linear module 33 and electric push rod 38 to reset.

[0104] D. Place the locating pin 2 in the first sidewall hole 11 that needs to be machined at the top of the pipe fitting 1;

[0105] E. Control the drive motor I27 and drive motor II28 to rotate forward, so that the drive wheel I4 and drive wheel II6 rotate at a certain speed, driving the driven wheel I3 and driven wheel II8 to move, and the drive device travels in a straight line inside the pipe 1;

[0106] F. When the head cover 9 steps contact the inner end of the positioning pin 2, the walking unit stops linear feeding and controls the indexing plate 21 to rotate a certain angle.

[0107] G. Turn on the photoelectric switch. During the rotation of the indexing plate 21, the photoelectric switch identifies the angle of the side wall hole 11 in the circumference of the pipe fitting 1 due to the light transmission and obstruction of the side wall hole 11.

[0108] H. If the side wall holes 11 of the pipe fitting 1 are two rows of continuous and evenly distributed, the control linear module 33 and the indexing plate 21 will move together so that the photoelectric switch can identify the position of the second row of side wall holes 11 in the axial and circumferential directions.

[0109] I. After the photoelectric switch returns to its original position, execute the photoelectric switch tool setting procedure, open the endoscope 34, and photograph the surface morphology of the side wall hole 11.

[0110] J. After the tool setting is completed, control the electric push rod 38 to move linearly, and the height of the connection position of the right side of the spindle motor support 15 is reduced, so that the spherical grinding rod 10 contacts the left side of the side wall hole 11.

[0111] K. Control the spindle motor 14 to rotate, causing the ball grinding rod 10 to rotate. This, in conjunction with the feed motion of the linear module 33 and the electric push rod 38, controls the grinding depth of the ball grinding rod 10 and executes the processing program.

[0112] L. After completing the chamfering of all sidewall holes 11, the endoscope 34 takes pictures of the surface of the sidewall holes 11 and evaluates the surface quality of the sidewall holes 11 through the data processing program.

[0113] M. After the processing result meets the chamfering error, control the spindle motor 14 speed to 0, the linear module 33 and electric push rod 38 reset, control the drive motor I 27 and drive motor II 28 to reverse, drive the drive wheel I 4, drive wheel II 6, driven wheel I 3 and driven wheel II 8 to rotate, and the device moves outward in a straight line until the pull ring 5 of the right end cover 12 is exposed to the tube 1.

[0114] N. Stop the drive motor I 27 and drive motor II 28, manually pull the pull ring 5, remove the device, and disconnect the device power supply.

[0115] In this invention, the directions up, down, left, right, front, and back are only relative to... Figure 1 This does not constitute any limitation on the present invention.

[0116] This invention is not limited to this embodiment. Any equivalent concept or modification within the technical scope disclosed in this invention shall be included within the protection scope of this invention.

Claims

1. An automatic chamfering device for sidewall holes of pipe fittings with large depth-to-diameter ratio, characterized in that: It includes a main body, a walking unit, a processing unit and a positioning unit. The processing unit is connected to the positioning unit, and the positioning unit is connected to the main body through the walking unit. The large depth-to-diameter ratio pipe fitting is hereinafter referred to as pipe fitting (1). The main body of the machine includes a cylinder (7), a left end cover (16), a connecting strip (20), an upper shell (18), a lower shell (19), a right end cover (12), a pull ring (5), and a plug (13). The pull ring (5) and the plug (13) are fixed on the right end cover (12). The left and right ends of the cylinder (7) are connected to the left end cover (16) and the right end cover (12) respectively. There are two connecting strips (20). The left and right ends of the connecting strips (20) are connected to the left end cover (16) and the right end cover (12) respectively. The two connecting strips (20) are arranged apart front and back, and the center line of the connecting strips (20) is located in the horizontal plane. The upper shell (18) is fixedly connected across the upper side of the two connecting strips (20), and the lower shell (19) is fixedly connected across the lower side of the two connecting strips (20). The walking unit includes drive motor I (27), drive motor II (28), drive motor I support (26), pressure plate (25), tensioning mechanism I, tensioning mechanism II, swing bracket (30), drive wheel I (4), drive wheel II (6), driven wheel I (3) and driven wheel II (8); There are two driven wheels I (3), which are symmetrically installed on the front and rear sides of the left end of the upper housing (18) via a connecting shaft (39); There are two driven wheels II (8), which are symmetrically installed on the front and rear sides of the left end of the lower housing (19) via a connecting shaft (39); There are two drive wheels I (4), which are symmetrically installed on the front and rear sides of the right end of the upper housing (18) via the output shaft of drive motor I (27); There are two drive wheels II (6), which are symmetrically installed on the front and rear sides of the right end of the upper housing (18) via the output shaft of the drive motor II (28); The drive motor I (27) is connected to the drive motor I support (26), and the top of the drive motor I support (26) is fixedly connected to the upper housing (18); The drive motor II (28) is connected to the pressure plate (25). The right end of the pressure plate (25) is connected to the lower housing (19) via a pin (41), and the left end is connected to the tensioning mechanism II. The tensioning mechanism II includes a spring (24) and a pressure rod (29), wherein the spring (24) is nested on the pressure rod (29); The lower end of the spring (24) of the tensioning mechanism II is connected to the pressure plate (25), the upper end of the spring (24) is in contact with the nut (40), the upper end of the pressure rod (29) is connected to the nut (40) by a thread, and the lower end of the pressure rod (29) is fixedly connected to the lower housing (19). The tensioning mechanism I and the tensioning mechanism II have the same structure; The lower end of the spring (24) of the tensioning mechanism I is connected to the swing bracket (30), the upper end of the spring (24) is in contact with the nut (40), the upper end of the pressure rod (29) is connected to the nut (40) by a thread, and the lower end of the pressure rod (29) is fixedly connected to the lower housing (19). The processing unit includes a spindle motor (14), a spindle motor support (15), a spindle bracket (22), a ball grinding rod (10), a bearing (23), an endoscope (34), a support (37), a mounting block (36), an electric push rod (38), an indexing plate (21), a transfer bracket (32), and a linear module (33); The bottom of the linear module (33) is fixed to the lower housing (19). The top of the linear module (33) is connected to the indexing plate (21) through the adapter bracket (32). The indexing plate (21) is connected to the spindle bracket (22). The left end of the spindle bracket (22) is connected to the spindle motor support (15) through the bearing (23). The spindle motor support (15) is connected to the spindle motor (14). The spindle motor (14) is connected to the ball grinding rod (10) through the clamp. The mounting block (36) is fixed on the right crossbeam of the spindle bracket (22). The mounting block (36) is connected to the electric push rod (38). The bottom of the electric push rod (38) is connected to the right side of the spindle motor support (15). The endoscope (34) is fixed on the right crossbeam of the spindle bracket (22) through the support (37). The adapter bracket (32) is L-shaped, with its short side connected to the indexing plate (21) to transmit rotational power, and its long side connected to the top of the linear module (33) to increase structural rigidity; the spindle motor support (15) adjusts the clamping force on the spindle motor (14) through bolts, thereby fixing the spindle motor (14); The angle between the axis of the main spindle motor (14) and the central axis of the cylinder (7) is 30° to 60°. The positioning unit includes a positioning pin (2), a head cover (9), a positioning sensor (35), a reducer (31), and an indexing motor (17). The size of the positioning pin (2) matches the size of the side wall hole (11). During operation, the positioning pin (2) is inserted into the side wall hole (11) from the outside to the inside, and the inner end extends out of the inner wall of the tube (1). The head cover (9) is mounted on the spindle support (22). The positioning sensor (35) is fixed on the right end crossbeam of the spindle support (22) through a support (37). The indexing motor (17) is connected to the indexing plate (21) through the reducer (31). The outer shape of the head cover (9) is a stepped cylinder shape. The difference between the outer radius of the right cylinder and the outer radius of the left cylinder is greater than the diameter of the inner end of the positioning pin (2). When the inner end of the positioning pin (2) contacts the stepped surface on the right side of the head cover (9) and the diameter of the spherical grinding rod (10) is at its maximum size, the distance from the rotation center of the spindle motor support (15) to the stepped surface on the right side of the head cover (9) is greater than the distance from the rotation center to the ball end of the spherical grinding rod (10).

2. The automatic chamfering device for sidewall holes of pipe fittings with large depth-to-diameter ratio according to claim 1, characterized in that: The lower end of the electric push rod (38) is rotatably connected to the right end of the main shaft motor support (15) via a rotating shaft.

3. The automatic chamfering device for sidewall holes of pipe fittings with large depth-to-diameter ratio according to claim 1, characterized in that: The speeds of both drive motor I (27) and drive motor II (28) are less than 500 r / min.

4. The automatic chamfering device for sidewall holes of pipe fittings with large depth-to-diameter ratio according to claim 1, characterized in that: The pin (41) serves as the rotation center axis of the pressure plate (25). The pin (41) is located on the right side of the drive motor II (28), and the pressure plate (25) is fixed to the rear of the pin (41).

5. The automatic chamfering device for sidewall holes of pipe fittings with large depth-to-diameter ratio according to claim 1, characterized in that: The cross-sectional shape of the upper housing (18) is a "ji" shape, and the cross-sectional shape of the lower housing (19) is symmetric with respect to the horizontal plane to that of the upper housing (18); the installation positions of the driving wheel I (4) and the driving wheel II (6) are symmetric with respect to the horizontal plane; the installation positions of the driven wheel I (3) and the driven wheel II (8) are symmetric with respect to the horizontal plane.

6. The automatic chamfering device for sidewall holes of pipe fittings with large depth-to-diameter ratio according to claim 1, characterized in that: The positioning sensor (35) uses a photoelectric switch or a laser displacement sensor.

7. The automatic chamfering device for sidewall holes of pipe fittings with large depth-to-diameter ratio according to claim 1, characterized in that: The clamping end of the main shaft motor (14) is connected to the handle part of the spherical grinding rod (10) through a collet chuck.

8. The automatic chamfering device for sidewall holes of pipe fittings with large depth-to-diameter ratio according to claim 1, characterized in that: The linear travel length of the linear module (33) is greater than the maximum distance between two adjacent side wall holes (11) in the axial direction of the pipe fitting (1).

9. The automatic chamfering device for sidewall holes of pipe fittings with large depth-to-diameter ratio according to claim 1, characterized in that: The drive motor I (27) and the drive motor II (28) are both DC deceleration speed-regulating biaxial motors, that is, the line connecting the two output shafts is perpendicular to the axis of the motor.

10. The automatic chamfering device for sidewall holes of pipe fittings with large depth-to-diameter ratio according to claim 1, characterized in that: The connecting bar (20) is a square pipe; The rotation speed range of the main shaft motor (14) is stepless speed regulation; The bearing (23) connecting the main shaft motor support (15) and the main shaft support (22) is located at the bottom of the main shaft motor support (15); The measurement range of the positioning sensor (35) is greater than the maximum value of half of the difference between the diameter of the series of pipe fittings (1) to be measured and the length dimension of the electric push rod (38); The main shaft motor (14) has a forward and reverse function; The spherical grinding rod (10) is an elastic rod type; The electric push rod (38) is connected to the mounting block (36) through a pin shaft (41); Both the endoscope (34) and the positioning sensor (35) are firmly installed on the support (37) by using set screws; The installation position of the endoscope (34) is directly above the spherical grinding rod (10), and is used to observe the chamfer quality of the edge of the side wall hole (11) after processing, and its best focal length range for measurement covers the descending distance of the spherical grinding head.

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