Device and method for grinding inner surface of non-magnetic concentric variable diameter tube with magnetic particles

Abstract

The present invention relates to the technical field of tube inner surface polishing, and specifically to a non-magnetic concentric variable diameter tube inner surface magnetic particle grinding device and method. It includes a gear rotating mechanism, a sliding variable diameter mechanism, a lathe, a magnet, a distance sensor and a PLC control system; the lathe is provided with a spindle box, a slide box I and a slide box II in sequence, and the two ends of the workpiece are respectively clamped on a triangular chuck I connected to the spindle box and a triangular chuck II connected to the slide box II, and the gear rotating mechanism is installed on the slide box I; the sliding variable diameter mechanism is installed on the inner end face of the large gear, the sliding variable diameter mechanism is a retractable structure, the magnet is installed at the end of the sliding variable diameter mechanism, and the large gear drives the magnet to rotate to form a rotating magnetic field; the distance sensor is installed on the magnet, and the PLC control system is electrically connected to the distance sensor and the sliding variable diameter mechanism. It has high processing efficiency and good precision, and can be widely used in magnetic particle grinding and polishing of the inner surface of non-magnetic concentric variable diameter tubes.

Description

Technical Field

[0001] The invention relates to the technical field of tube inner surface polishing, and in particular to a magnetic particle grinding device and method for the inner surface of a non-magnetic concentric variable diameter tube. Background Art

[0002] With the rapid development of industries such as petroleum, chemical industry, and natural gas, various new types of pipe fittings have emerged. The processing requirements for parts are getting higher and higher. Not only must the dimensional accuracy of the parts be guaranteed, but also the parts must have good microscopic surface morphology, corrosion resistance, and fatigue resistance. The purpose of non-magnetic concentric reducers is to connect pipes or valves with different diameters in the transportation of oil and natural gas pipelines. The current processing methods are manual polishing and chemical polishing of non-magnetic concentric reducers. However, manual polishing not only has high labor costs, but also has high labor intensity and low processing efficiency. It can only process parts that can be touched by fingers, and the processing range is narrow; chemical polishing uses corrosive chemical reagents, which has certain damage to the human body and the environment, and is affected by many factors. Chemical corrosion reactions are difficult to control and processing accuracy is difficult to guarantee.

[0003] Magnetic particle grinding not only has good flexibility, adaptability and self-sharpening, but also has the advantages of small plastic deformation of the processed area, small residual stress, small deformation, small cutting amount, small temperature rise, clean and environmentally friendly, and no flying dust during the processing.

[0004] At present, the magnetic particle grinding method can be used to grind and polish the plane. However, due to the complex structure of the inner surface of the non-magnetic concentric reducer and the constant change of the inner diameter, the existing magnetic particle grinding device cannot perform magnetic particle grinding on the inner surface of the non-magnetic concentric reducer. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a magnetic particle grinding device and method for the inner surface of a non-magnetic concentric reducer, which has high processing efficiency and good processing accuracy and can be widely used in magnetic particle grinding and polishing of the inner surface of a non-magnetic concentric reducer.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The invention discloses a magnetic particle grinding device for the inner surface of a non-magnetic concentric reducer tube, comprising a gear rotating mechanism, a sliding reducer mechanism, a lathe, a magnet, a distance sensor and a PLC control system; the lathe is provided with a spindle box, a slide box I and a slide box II in sequence, the two ends of a workpiece are respectively clamped on a triangular chuck I connected to the spindle box and a triangular chuck II connected to the slide box II, the large gear of the gear rotating mechanism is located outside the workpiece, and the gear rotating mechanism is installed on the slide box I; the sliding reducer mechanism is installed on the inner end face of the large gear, the sliding reducer mechanism is a retractable structure, the magnet is installed on the end of the sliding reducer mechanism, and the large gear drives the magnet to rotate to form a rotating magnetic field; the distance sensor is installed on the magnet, and the PLC control system is electrically connected to the distance sensor and the sliding reducer mechanism.

[0008] The gear rotating mechanism comprises a small gear, a large gear and a small gear motor; the small gear is meshed with the large gear, the small gear motor is connected with the small gear, and the small gear motor drives the small gear to rotate.

[0009] The gear rotating mechanism also includes a bracket, one end of which is fixedly connected to the slide box I, and the other end of which is slidably connected to the large gear, and the bracket supports the large gear.

[0010] The sliding diameter-changing mechanism includes a support motor, slide one, slide two, slide three and a bearing magnet platform; the support motor is fixed on the inner end surface of the large gear, the support motor is connected to slide one, the support motor drives slide one to rotate, slide one is slidingly connected to slide two, slide two is slidingly connected to slide three, the bearing magnet platform is connected to slide three, and the magnet is adsorbed on the bearing magnet platform.

[0011] The sliding diameter-changing mechanism also includes a support, a rotating shaft, a bevel gear 1 and a bevel gear 2. The support is fixedly connected to the slide 1, the rotating shaft is installed on the support, the bevel gear 1 is installed on the rotating shaft, the bevel gear 1 is meshed with the bevel gear 2, the bevel gear 2 is connected to the support motor, and the support motor drives the bevel gear 2 to rotate.

[0012] The slide plate 1 is provided with a rack, the slide plate 2 is provided with a gear meshing therewith, the motor is connected to the gear, the motor drives the gear to rotate, and then drives the slide plate 2 to slide along the rack of the slide plate 1; the slide plate 2 is provided with a rack, the slide plate 3 is provided with a gear meshing therewith, the motor is connected to the gear, the motor drives the gear to rotate, and then drives the slide plate 3 to slide along the rack of the slide plate 2.

[0013] The sliding diameter-changing mechanism also includes an electric push rod, which is installed inside the sliding piece three and is connected to the bearing magnet platform through a connector.

[0014] The lathe also includes a screw and a guide rail. The bottoms of the slide box I and the slide box II are installed on the guide rail, and the sides of the slide box I and the slide box II are installed on the screw.

[0015] The axes of the triangular chuck I, the triangular chuck II and the large gear coincide with each other.

[0016] A method for grinding the inner surface of a non-magnetic concentric variable diameter tube with magnetic particles, comprising the following steps:

[0017] 1) Clamp the two ends of the non-magnetic concentric reducer (workpiece) on the triangular chuck I and triangular chuck II of the lathe respectively, and use the concentricity measuring instrument to ensure the coaxiality of the non-magnetic concentric reducer and the lathe spindle;

[0018] 2) The grinding liquid and the magnetic abrasive are uniformly mixed in a ratio of 1:1.5, the mixed abrasive is adsorbed by a radial cylindrical auxiliary magnet, and then the radial cylindrical auxiliary magnet is placed in a non-magnetic concentric reducer;

[0019] 3) Operate the handle of slide box II to release slide box II from the control of the screw;

[0020] 4) Turn on the lathe spindle switch to rotate the lathe spindle at a speed of 1000-2000r / min. The triangular chuck I drives the non-magnetic concentric reducer and triangular chuck II to rotate synchronously; start the small gear motor to make the large gear and the non-magnetic concentric reducer rotate in the opposite direction;

[0021] 5) Start the auxiliary motor in the spindle box, so that the lead screw drives the slide box I to make axial reciprocating motion, and grind and polish the inner surface of the non-magnetic concentric reducer with magnetic particles at a speed of 50-100 mm / min;

[0022] 6) At the same time, when the PLC control system obtains the distance from the infrared distance sensor to the outer surface of the workpiece measured by the infrared distance sensor, the PLC control system ensures that the distance from the magnet to the surface of the workpiece is constant by controlling the difference in the extension length of the electric push rod and the rotation of the two degrees of freedom of the connector, and sets the distance between the two to 2±0.5mm.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention includes a gear rotating mechanism, a sliding diameter-changing mechanism, and a lathe. The lathe drives the non-magnetic concentric diameter-changing tube to rotate, and the gear rotating mechanism drives the magnet to rotate to form a rotating magnetic field for magnetic particle grinding. The lathe with the gear rotating mechanism moves to achieve feeding, and the sliding diameter-changing mechanism is used to achieve the diameter-changing effect, thereby realizing the magnetic particle grinding and polishing of the non-magnetic concentric diameter-changing tube. The present invention can be widely used in the magnetic particle grinding processing of the inner surface of such pipe fittings.

[0025] 2. The present invention utilizes an infrared distance measuring sensor to monitor in real time the distance from the infrared distance measuring sensor to the outer surface of the non-magnetic concentric reducer, and feeds back the measured distance value to the PLC control system in real time, thereby realizing real-time monitoring of the processing distance.

[0026] 3. The present invention utilizes a PLC control system to regulate the sliding diameter-changing mechanism in real time, thereby ensuring a constant distance from the magnet to the outer surface of the non-magnetic concentric diameter-changing tube, thereby realizing online processing, reducing labor costs, and improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 2 A schematic top view of the structure of the present invention;

[0029] Figure 3 This is a schematic front view of the structure of the sliding diameter-changing mechanism of the present invention;

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of the sliding diameter-changing mechanism of the present invention;

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the sliding diameter-changing mechanism of the present invention from another angle;

[0032] Figure 6 It is a structural schematic diagram of the support motor, support, and slide of the sliding diameter-changing mechanism of the present invention;

[0033] Figure 7 This is a schematic diagram of the structure of the connection between the sliding vanes of the sliding diameter-changing mechanism of the present invention;

[0034] Figure 8 This is a schematic diagram of the electric push rod structure of the present invention;

[0035] Fig. 9 This is the electrical principle block diagram of the present invention.

[0036] In the figure: 1-spindle box 2-three-piece chuck I 3-large gear 4-three-piece chuck II 5-chuck support 6-guide rail 7-screw support 8-slide box II 9-small gear motor 10-support seat 11-small gear 12-bracket 13-slide box I 14-PLC control system 15-non-magnetic concentric reducer 16-handle II 17-small handwheel II 18-large handwheel II 19-screw 20-handle I 21-small handwheel I 22-large handwheel I 23-support motor 24-slide one 25-slide two 26-slide three 27-electric push rod 28-magnet 29-carrying magnet platform 30-connector 31-infrared ranging sensor. DETAILED DESCRIPTION

[0037] Example:

[0038] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0039] like Figure 1 , Figure 2 As shown, the magnetic particle grinding device for the inner surface of a non-magnetic concentric variable diameter pipe includes a gear rotating mechanism, a sliding variable diameter mechanism, a lathe, a magnet, an infrared distance measuring sensor 31 and a PLC control system 14.

[0040] The lathe comprises a spindle box 1, a triangular chuck Ⅰ2, a triangular chuck Ⅱ4, a guide rail 6, a lead screw 19, a slide box Ⅰ13 and a slide box Ⅱ8. The spindle box 1, the slide box Ⅰ13 and the slide box Ⅱ8 are sequentially mounted on the bed, the guide rail 6 is mounted on the top surface of the bed, the lead screw 19 is mounted on the side of the bed, the slide box Ⅰ13 and the slide box Ⅱ8 are mounted on the guide rail 6 at the bottom, and the side is mounted on the lead screw 19. The handle Ⅰ20, the small hand wheel Ⅰ21 and the large hand wheel Ⅰ22 are mounted on the slide box Ⅰ13, and the handle Ⅱ16, the small hand wheel Ⅱ17 and the large hand wheel Ⅱ18 are mounted on the slide box Ⅱ8.

[0041] The triangular chuck Ⅰ2 is mounted on the spindle box 1, and the triangular chuck Ⅱ4 is mounted on the chuck support 5 through an angular contact ball bearing, and the chuck support 5 is fixed to the slide box Ⅱ8. The triangular chuck Ⅰ2 and the triangular chuck Ⅱ4 respectively clamp one end of the non-magnetic concentric reducer, and the triangular chuck Ⅰ2 drives the triangular chuck Ⅱ4 to rotate synchronously through the workpiece.

[0042] The lead screw 19 is controlled by the auxiliary motor in the spindle box 1, and the auxiliary motor drives the lead screw 19 to rotate forward and reverse, and the lead screw 19 drives the slide box Ⅰ13 to move synchronously, thereby realizing the axial reciprocating motion of the sliding diameter-changing mechanism.

[0043] The gear rotating mechanism includes a pinion 11, a large gear 3, a pinion motor 9, a support seat 10, a transmission shaft and a bracket 12. The pinion 11 is mounted on the transmission shaft, and both ends of the transmission shaft are mounted on bearings, and the bearings are mounted on the support seat 10, and the support seat 10 is fixed to the top surface of the slide box Ⅰ13. The pinion 11 is meshed with the large gear 3, and the pinion motor 9 is connected to the transmission shaft of the pinion 11 through a coupling, and the pinion motor 9 drives the pinion 11 and the large gear 3 to rotate synchronously. One end of the bracket 12 is fixed to the slide box Ⅰ13, and the other end is slidably connected to the large gear 3, and the bracket 12 supports the large gear 3. There are four brackets 12 in total, which are distributed on both sides of the large gear 3 and welded to the slide box Ⅰ13. The contact part between the large gear 3 and the bracket 12 must be fully lubricated. The axes of the triangular chuck Ⅰ2, triangular chuck Ⅱ4 and large gear 3 coincide to facilitate processing.

[0044] like Figure 3-8 As shown, the sliding diameter-changing mechanism includes a support motor 23 , a slide 1 24 , a slide 25 , a slide 3 26 , an electric push rod 27 and a bearing magnet platform 29 .

[0045] The sliding diameter-changing mechanism also includes a support, a rotating shaft, a bevel gear 1 and a bevel gear 2. The support is fixedly connected to the slide 1 24, the rotating shaft is installed on the support, the bevel gear 1 is installed on the rotating shaft, the bevel gear 1 is meshed with the bevel gear 2, and the bevel gear 2 is connected to the support motor 23. The support motor 23 drives the bevel gear 2 to rotate, and then drives the slide 1 24 to rotate. The support motor 23 drives the bevel gear to rotate to realize the rotation of the entire sliding diameter-changing mechanism, so as to facilitate the processing of the non-magnetic concentric reducer tube close to the limit processing size.

[0046] The slide plate 1 24 is provided with a rack, the slide plate 2 25 is provided with a gear meshing therewith, the motor is connected to the gear, the motor drives the gear to rotate, and then drives the slide plate 2 25 to slide along the rack of the slide plate 1 24. The slide plate 2 25 is provided with a rack, the slide plate 3 26 is provided with a gear meshing therewith, the motor is connected to the gear, the motor drives the gear to rotate, and then drives the slide plate 3 26 to slide along the rack of the slide plate 2 25, thereby realizing adaptive processing of different diameter parts of the non-magnetic concentric reducer.

[0047] The sliding diameter-changing mechanism also includes an electric push rod 27, which is an existing product. The rod portion of the electric push rod 27 is curved and can be customized according to the curvature of the sliding plate 3 26. The electric push rod 27 is installed in the sliding plate 3 26. The electric push rod 27 is connected to the bearing magnet platform 29 through a connector 30. The magnet 28 is adsorbed on the bearing magnet platform 29.

[0048] like Fig. 9 As shown, the PLC control system 14 is electrically connected to the gear rotating mechanism, the sliding diameter-changing mechanism, the lathe, and the distance sensor 31. The infrared distance sensor 31 transmits the distance signal to the PLC control system 14, and the PLC control system 14 controls the gear rotating mechanism, the sliding diameter-changing mechanism, the motor of the lathe, and the electric push rod 27.

[0049] like Figure 1 , Fig. 9 As shown, infrared distance sensors 31 are installed at both ends of the magnet 28. When the PLC control system 14 obtains the distance from the infrared distance sensor 31 to the outer surface of the workpiece measured by the infrared distance sensor 31, the PLC control system 14 ensures that the distance from the magnet 28 to the surface of the workpiece is constant by controlling the difference in the extension length of the electric push rod 27 and the rotation of the two degrees of freedom of the connector 30, and sets the distance between the two to 2 mm.

[0050] like Figure 1-9 As shown, a method for grinding the inner surface of a non-magnetic concentric variable diameter tube with magnetic particles specifically comprises the following steps:

[0051] (1) The triangular chuck II4 is adjusted to a suitable position by manually turning the large hand wheel II18. The non-magnetic concentric reducer 15 is clamped by the triangular chuck I2 and the triangular chuck II4. The coaxiality of the non-magnetic concentric reducer 15 and the lathe spindle is ensured by using a concentricity measuring instrument. The axes of the triangular chuck I2, the triangular chuck II4 and the large gear 3 are made to coincide with each other to facilitate processing.

[0052] (2) The grinding liquid and the magnetic abrasive are uniformly mixed in a ratio of 1:1.5, and a radial cylindrical auxiliary magnet is used to absorb sufficient mixed abrasive, and then the radial cylindrical auxiliary magnet is placed in a non-magnetic concentric reducer 15;

[0053] (3) Operating handle II 16 to release the slide box II 8 from the control of the screw;

[0054] (4) Turn on the spindle switch to rotate the lathe spindle at a speed of 1000-2000 r / min. The triangular chuck I2 drives the non-magnetic concentric reducer 15 and the triangular chuck II4 to rotate synchronously. Turn on the sliding reducer mechanism switch to make the large gear 3 and the non-magnetic concentric reducer 15 rotate in opposite directions.

[0055] (5) Start the auxiliary motor in the spindle box, so that the lead screw 19 drives the slide box I 13 to make axial reciprocating motion, and grind and polish the inner surface of the non-magnetic concentric reducer 15 with magnetic particles at a speed of 50-100 mm / min.

[0056] (6) At the same time, when the PLC control system 14 obtains the distance from the infrared distance sensor 31 to the outer surface of the workpiece measured by the infrared distance sensor 31, the PLC control system 14 ensures that the distance from the magnet 28 to the surface of the workpiece is constant by controlling the difference in the extension length of the electric push rod 27 and the rotation of the connector 30 in two degrees of freedom, and sets the distance between the two to 2 mm.

[0057] The present invention drives the magnet to rotate through a gear rotating mechanism to form a rotating magnetic field for magnetic particle grinding. Feeding is achieved by moving the lathe with a gear rotating mechanism, and a sliding diameter-changing mechanism is used to achieve a diameter-changing effect, thereby realizing magnetic particle grinding and polishing of non-magnetic concentric diameter-changing pipes. The present invention can be widely used in magnetic particle grinding processing of the inner surface of such pipe fittings.

[0058] The present invention utilizes the infrared distance measuring sensor 31 to monitor the distance from the infrared distance measuring sensor 31 to the outer surface of the non-magnetic concentric reducer in real time, and feeds back the measured distance value to the PLC control system 14 in real time, thereby realizing real-time monitoring of the processing distance.

[0059] The present invention utilizes the PLC control system 14 to regulate the sliding diameter-changing mechanism in real time, thereby ensuring a constant distance from the magnet to the outer surface of the non-magnetic concentric diameter-changing tube, realizing online processing, reducing labor costs, and improving processing efficiency.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A non-magnetic concentric reducer inner surface magnetic particle grinding device, characterized in that: It includes a gear rotating mechanism, a sliding diameter reducing mechanism, a lathe, a magnet, a distance measuring sensor and a PLC control system; the lathe is provided with a spindle box, a slide box I and a slide box II in sequence, the two ends of the workpiece are respectively clamped on a triangular chuck I connected to the spindle box and a triangular chuck II connected to the slide box II, the large gear of the gear rotating mechanism is located outside the workpiece, and the gear rotating mechanism is installed on the slide box I; the sliding diameter reducing mechanism is installed on the inner end surface of the large gear, the sliding diameter reducing mechanism is a retractable structure, the magnet is installed on the end of the sliding diameter reducing mechanism, and the large gear drives the magnet to rotate to form a rotating magnetic field; the distance measuring sensor is installed on the magnet, and the PLC control system is electrically connected to the distance measuring sensor and the sliding diameter reducing mechanism; The gear rotating mechanism comprises a pinion, a large gear and a pinion motor; the pinion is meshed with the large gear, the pinion motor is connected to the pinion, and the pinion motor drives the pinion to rotate; The gear rotating mechanism also includes a bracket, one end of which is fixedly connected to the slide box I, and the other end is slidably connected to the large gear, and the bracket supports the large gear; The sliding diameter-changing mechanism comprises a support motor, a sliding plate 1, a sliding plate 2, a sliding plate 3 and a bearing magnet platform; The support motor is fixed on the inner end surface of the large gear, the support motor is connected to the slide plate 1, the support motor drives the slide plate 1 to rotate, the slide plate 1 is slidably connected to the slide plate 2, the slide plate 2 is slidably connected to the slide plate 3, the bearing magnet platform is connected to the slide plate 3, and the magnet is adsorbed on the bearing magnet platform; The sliding diameter-changing mechanism also includes a support, a rotating shaft, a bevel gear 1 and a bevel gear 2, the support is fixedly connected to the slide plate 1, the rotating shaft is installed on the support, the bevel gear 1 is installed on the rotating shaft, the bevel gear 1 is meshed with the bevel gear 2, the bevel gear 2 is connected to the support motor, and the support motor drives the bevel gear 2 to rotate; The slide plate 1 is provided with a rack, the slide plate 2 is provided with a gear meshing therewith, the motor is connected to the gear, the motor drives the gear to rotate, and then drives the slide plate 2 to slide along the rack of the slide plate 1; the slide plate 2 is provided with a rack, the slide plate 3 is provided with a gear meshing therewith, the motor is connected to the gear, the motor drives the gear to rotate, and then drives the slide plate 3 to slide along the rack of the slide plate 2; The sliding diameter-changing mechanism further includes an electric push rod, which is installed inside the sliding plate 3 and is connected to the bearing magnet platform through a connector; The lathe also includes a screw and a guide rail. The bottoms of the slide box I and the slide box II are installed on the guide rail, and the sides of the slide box I and the slide box II are installed on the screw.

2. The magnetic particle grinding device for inner surface of non-magnetic concentric reducer pipe according to claim 1, characterized in that: The axes of the triangular chuck I, the triangular chuck II and the large gear coincide with each other.

3. A method for grinding the inner surface of a non-magnetic concentric reducer with magnetic particles, which is implemented based on the non-magnetic concentric reducer inner surface grinding device according to claim 1, characterized in that: The specific steps include: 1) Clamp the two ends of the non-magnetic concentric reducer workpiece on the triangular chuck I and triangular chuck II of the lathe respectively, and use the concentricity measuring instrument to ensure the coaxiality of the non-magnetic concentric reducer and the lathe spindle; 2) The grinding liquid and the magnetic abrasive are uniformly mixed in a ratio of 1:1.5, the mixed abrasive is adsorbed by a radial cylindrical auxiliary magnet, and then the radial cylindrical auxiliary magnet is placed in a non-magnetic concentric reducer; 3) Operate the handle of slide box II to release slide box II from the control of the screw; 4) Turn on the lathe spindle switch to make the lathe spindle rotate at a speed of 1000-2000r / min, and the triangular chuck I drives the non-magnetic concentric reducer and triangular chuck II to rotate synchronously; Start the small gear motor to make the large gear and the non-magnetic concentric reducer rotate in opposite directions; 5) Start the auxiliary motor in the spindle box, so that the lead screw drives the slide box I to make axial reciprocating motion, and grind and polish the inner surface of the non-magnetic concentric reducer with magnetic particles at a speed of 50-100 mm / min; 6) At the same time, when the PLC control system obtains the distance from the infrared distance sensor to the outer surface of the workpiece measured by the infrared distance sensor, the PLC control system ensures that the distance from the magnet to the surface of the workpiece is constant by controlling the difference in the extension length of the electric push rod and the rotation of the two degrees of freedom of the connector, and sets the distance between the two to 2±0.5mm.

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