Surface grinding machine tool for electrolytic polishing pretreatment of circular pipeline

Abstract

The invention relates to the technical field of pipe fitting rotating surface grinding, and discloses a surface grinding machine tool for electrolytic polishing pretreatment of a circular pipeline, which comprises a machine tool upper seat, two groups of end parts of the machine tool upper seat are symmetrically provided with support frames, and a bidirectional screw rod is horizontally and rotatably arranged in the machine tool upper seat; the two ends of the two-way lead screw are fixed to the inner wall of the machine tool upper base through bearing pedestals. An air cylinder rod extends outwards, on one hand, a push seat is driven to move along a limiting linear groove, a part of a grinding block extends out of a containing groove through a series of transmission to make contact with the inner surface of a circular pipe fitting, and the inner rotating face of the circular pipe fitting is ground through the grinding block; the sealing block at the liquid inlet is pushed open, so that the grinding fluid in the inner cavity enters the annular centrifugal cavity through the drainage section, and the grinding fluid in the annular centrifugal cavity can do centrifugal wall-attached movement, is randomly thrown outwards from the centrifugal guide pipe at the cavity wall and is sprayed outwards from the liquid spraying inclined holes.

Description

Technical Field

[0001] The invention relates to the technical field of pipe rotating surface grinding, in particular to a surface grinding machine tool used for electrolytic polishing pretreatment of circular pipes. Background Art

[0002] Steel pipes are made by perforating steel ingots or solid round steel into rough pipes, and then hot-rolled, cold-rolled or cold-drawn. They are often used in refrigeration, HVAC, water pipes, steam pipes, oil pipes and other fields. When processing steel pipes, it is necessary to grind both sides of the rough inner surface of the steel pipe. Only after the inner surface is evenly ground can it be connected with other steel pipes, so grinding machine tools are used.

[0003] Existing steel pipe grinding machines have many technical defects when in use. First, the inside of both ends of the steel pipe needs to be ground separately using a grinder, which is time-consuming and labor-intensive, resulting in low work efficiency; second, the grinding fluid reduces the friction between the tool and the workpiece through lubrication, improves the material removal rate and maintains the surface quality of the workpiece. The grinding fluid also absorbs a large amount of heat generated during the grinding process through cooling, reducing the risk of thermal deformation of the workpiece. Current steel pipe grinding machines generally manually sprinkle grinding fluid into the pipe, which is not uniform and has a low degree of automation; third, after the grinding operation is completed, sticky waste will remain inside the steel pipe after being stained with liquid, which is difficult to rinse directly with water and is time-consuming and labor-intensive to clean.

[0004] In summary, considering that the existing facilities cannot meet the work requirements, we propose a surface grinding machine for electrolytic polishing pretreatment of circular pipes. Summary of the invention

[0005] The main purpose of the present invention is to provide a surface grinding machine tool for electrolytic polishing pretreatment of circular pipes, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is: A surface grinding machine for electrolytic polishing pretreatment of circular pipes, comprising a machine tool seat, two groups of end portions of the machine tool seat are symmetrically provided with support frames, the number of the support frames is preferably 4-8 groups, a bidirectional screw rod is provided inside the machine tool seat for horizontal rotation, both ends of the bidirectional screw rod are fixed by a bearing seat and the inner wall of the machine tool seat, one end of the bidirectional screw rod extends outwardly and is connected to a servo motor through a coupling, and the servo motor passes through the outer end surface of the machine tool seat.

[0007] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, the bidirectional screw is symmetrically provided with forward spiral portions and reverse spiral portions, and movable grinding structures are movably provided on the forward spiral portions and the reverse spiral portions, and the number of the movable grinding structures is 2 groups.

[0008] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, each group of the movable grinding structure includes a moving seat, a screw nut sleeve acting on the forward spiral portion and the reverse spiral portion is installed inside the moving seat, a traction arm is welded to the lower end of the moving seat, a strip groove for the movement of the traction arm is opened on the lower end surface of the seat of the machine tool, a rotating column is installed through the lower end of the traction arm, and the rotating column and the traction arm are fixed by a connecting bearing.

[0009] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, a grinding table is fixed at the end of the rotating column, a limiting shell is fixed at the end of the grinding table away from the rotating column, a small cylinder is horizontally installed in the limiting shell, a pneumatic mechanism acting on the small cylinder is arranged outside the limiting shell, a cylinder rod is movably arranged inside the small cylinder extending outward, a push seat is welded at the end of the cylinder rod, a limiting linear groove for the movement of the push seat is opened in the middle position of the interior of the grinding table, a slide groove is opened on the upper end surface of the push seat, and an inclined surface is arranged at the bottom of the slide groove.

[0010] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, a movable grinder acting on the inner surface of the circular pipe is installed in the slideway.

[0011] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, a machine lower seat is arranged directly below the machine upper seat, and a pipe clamp acting on the circular pipe fitting is arranged on the upper end surface of the machine lower seat, and the circular pipe fitting is centrally placed on the upper end surface of the machine lower seat.

[0012] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, a large gear is sleeved on the rotating column, a small gear is meshed at the lower end of the large gear, the small gear is sleeved on the output shaft of the uniform speed motor, a motor seat is arranged outside the uniform speed motor, and the upper end face of the motor seat is welded to the lower end face of the traction arm.

[0013] As a preferred embodiment of the surface grinding machine for electrolytic polishing pretreatment of circular pipes described in the present invention, the movable grinder includes a slider, a chamfered surface, a lifting rod, a reset spring, a grinding block, and a slot. The slider is located in the slot, and the lower end of the slider is provided with a chamfered surface that fits the inclined surface. The upper end of the slider extends out of the slot and is welded with a lifting rod. The upper end of the lifting rod is provided with a grinding block that acts on the inner surface of the circular pipe. The bottom surface of the grinding block is provided with a slot that acts on the lifting rod. The surface of the grinding table is provided with a receiving groove for the movement of the grinding block, and a reset spring that is sleeved on the outside of the lifting rod is fixed between the receiving groove and the slider.

[0014] As a preferred embodiment of the surface grinding machine for electrolytic polishing pretreatment of circular pipes described in the present invention, a centrifugal liquid sprinkling plate is fixed inside the grinding table and on the left side of the push seat, an annular centrifugal cavity is provided inside the centrifugal liquid sprinkling plate, a guide hole is provided at the middle position of the right end surface of the centrifugal liquid sprinkling plate, a push rod is welded to the end of the push seat away from the cylinder rod, the push rod passes through the guide hole and extends into the annular centrifugal cavity, centrifugal guide tubes are evenly distributed around the surface of the centrifugal liquid sprinkling plate, each group of the centrifugal guide tubes is connected to the annular centrifugal cavity, and inclined liquid sprinkling holes that act on the centrifugal guide tubes respectively are provided on the surface of the grinding table, and the number of the centrifugal guide tubes and the inclined liquid sprinkling holes are preferably 4-10 groups.

[0015] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, a liquid inlet is opened in the middle position of the end of the centrifugal liquid sprinkling plate away from the guide hole, a sealing block is movably arranged on the liquid inlet, and the push rod pushes the sealing block to move horizontally in a straight line.

[0016] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, a liquid storage cylinder is arranged inside the rotating column, an inner cavity is opened in the liquid storage cylinder, grinding fluid is stored in the inner cavity, the upper end of the liquid storage cylinder extends out of the rotating column and is provided with a liquid adding short tube, and a sealing cover is movably provided on the liquid adding short tube.

[0017] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, the liquid storage cylinder is sealed and fixed by the outer surface of the drainage section and the centrifugal liquid sprinkling plate, a skeleton is arranged at the center position of the drainage section, the skeleton and the inner wall of the drainage section are riveted, and the skeleton and the sealing block are connected by a connecting spring.

[0018] As a preferred solution of a surface grinding machine for electrolytic polishing pretreatment of circular pipes described in the present invention, the end of the pneumatic mechanism away from the small cylinder is connected to a hollow coupling, the hollow coupling is fixed to a limit shell, an airbag receiving seat is fixed to the end of the hollow coupling, a circular airbag is fitted in the airbag receiving seat, a joint for inserting the hollow coupling is provided in the middle position of the end face of the circular airbag, raised spheres are evenly distributed on the circumference of the circular airbag, and the number of the raised spheres is preferably 3-6 groups, each group of the raised spheres is wrapped with a cloth layer, the cloth layer is in contact with the inner surface of the circular pipe, and recessed openings for the raised spheres to extend out are evenly provided on the circumference of the airbag receiving seat, and cleaning bristles are evenly connected on the circumference of the airbag receiving seat and on both sides of the recessed openings.

[0019] As a preferred embodiment of the surface grinding machine for electrolytic polishing pretreatment of circular pipes described in the present invention, cleaners are symmetrically arranged on both sides of the lower seat of the machine tool, and the number of the cleaners is 2 groups. The cleaners include a cleaning outer seat, a connecting rod, a through port, an annular inner cleaning groove, side steps and a sewage pipe. The bottoms of the two groups of cleaning outer seats are respectively welded through the end faces of the connecting rod and the lower seat of the machine tool, and a through port is penetrated through the middle of the cleaning outer seat for the entry and exit of the grinding table and the airbag storage seat. An annular inner cleaning groove for the protruding sphere and the grinding block to extend into is opened on the inner side surface of the cleaning outer seat, and the cross-section of the annular inner cleaning groove is concave, and clean water is placed at the bottom of the annular inner cleaning groove. Side steps are symmetrically arranged on the inner side surface of the cleaning outer seat and located on both sides of the annular inner cleaning groove, and a sewage pipe is arranged at the bottom of the annular inner cleaning groove downwardly connected.

[0020] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, a control valve is installed in the sewage pipe.

[0021] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, the middle part of the bidirectional screw is set as a rotating shaft part.

[0022] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, the drainage section extends from the inside of the rotating column into the inside of the grinding table.

[0023] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, a sliding seal is used between the push rod and the guide hole.

[0024] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, the pneumatic mechanism includes an air storage chamber, an air pump and a pressure pump.

[0025] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, the pneumatic mechanism is provided with two sets of joints, one on the left and one on the right.

[0026] As a preferred solution of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes described in the present invention, the raised spheres are made of rubber material with deformation restoring properties.

[0027] The present invention provides a surface grinding machine tool for electrolytic polishing pretreatment of circular pipes through improvement, which has the following significant improvements and advantages compared with the prior art: Start the servo motor to drive the bidirectional lead screw to rotate at a uniform speed, the mobile grinding structure starts to move, and the two sets of moving seats move toward each other, respectively making the traction arms drive the rotating column to move toward the circular pipe along the strip groove, so that the two sets of grinding tables are synchronously extended into the circular pipe, which can realize the synchronous grinding of the inner surfaces of the two ends of the pipe, thereby improving work efficiency.

[0028] The cylinder rod extends outward, on the one hand, driving the push seat to move along the limiting linear groove, and through a series of transmissions, the grinding block is partially extended out of the receiving groove and contacts the inner surface of the circular pipe fitting, and the inner rotating surface of the circular pipe fitting is ground by the grinding block. On the other hand, the push rod outside the push seat will make a linear motion, push open the sealing block at the liquid inlet, so that part of the grinding fluid in the inner cavity enters the annular centrifugal cavity through the drainage section, and the grinding fluid in the annular centrifugal cavity will make a centrifugal wall-adhering motion, and will be randomly thrown outward from the centrifugal guide tube at the cavity wall and sprinkled out from the liquid sprinkling inclined hole. A small amount of grinding fluid will fall on the inner rotating surface of the circular pipe fitting, and the power of the rotating column can be reasonably used to realize automatic liquid sprinkling, which saves time and effort, makes the liquid sprinkling more uniform, and improves the linkage of the whole structure.

[0029] The circular airbag is inflated through a hollow connecting shaft, and the gas is concentrated and transferred to several groups of raised spheres, so that the raised spheres are partially extended out of the recessed mouth after being inflated, and are fully in contact with the inner rotating surface of the circular pipe. The rotating column drives the airbag storage seat to rotate at high speed, and at the same time, the traction arm pulls the airbag storage seat to do a return movement. The superposition of the two causes the raised sphere to move, and the cloth layer outside the raised sphere is used to clean and wipe the inside of the pipe after grinding. At the same time, it cooperates with several groups of cleaning bristles to make circular motions to clean the inner wall of the pipe. The combination of the two can efficiently clean up the residue in the pipe, with a high degree of automation.

[0030] When the grinding block or part of the raised sphere enters the annular inner cleaning tank, the rotating column drives the grinding block or the raised sphere to do circular motion, fully contacting the clean water in the tank. The impact force of the water flow can fully clean the grinding block or the raised sphere, achieving the effect of timely cleaning, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of one direction of a surface grinding machine tool for electrolytic polishing pretreatment of circular pipes according to the present invention; Figure 2 It is a schematic diagram of the overall structure of another direction of a surface grinding machine tool for electrolytic polishing pretreatment of circular pipes according to the present invention; Figure 3 It is a schematic diagram of the internal structure of the machine tool seat of the present invention; Figure 4 It is a schematic diagram of the external structure of the mobile grinding structure of the present invention; Figure 5 It is a schematic diagram of the external structure of the rotating column of the present invention; Figure 6 It is a schematic diagram of the internal structure of the grinding table of the present invention; Figure 7 It is a schematic diagram of the internal structure of the rotating column of the present invention; Figure 8 It is a schematic diagram of the specific structure of the movable grinder of the present invention; Fig. 9 It is a cross-sectional view of the liquid storage cylinder and the drainage section of the present invention; Fig.10 It is a structural schematic diagram of the centrifugal liquid-sprinkling plate of the present invention; Fig.11 It is a schematic diagram of the installation position of the airbag storage seat and the washer of the present invention; Fig.12 It is a schematic diagram of the external structure of the airbag storage seat of the present invention; Fig.13 It is a schematic diagram of the internal structure of the airbag storage seat of the present invention; Fig.14 It is a schematic diagram of the specific structure of the cleaning device of the present invention.

[0032] In the figure: 1. machine tool upper seat; 2. support frame; 3. machine tool lower seat; 4. pipe clamp; 5. round pipe fitting; 8. movable grinder; 81. slider; 82. chamfered surface; 83. lifting rod; 84. return spring; 85. grinding block; 86. slot; 9. cleaner; 91. cleaning outer seat; 92. connecting rod; 93. through port; 94. annular inner cleaning groove; 95. side stop; 96. drain pipe; 10. bidirectional screw; 11. bearing seat; 12. servo motor; 13. positive spiral pattern; 14. reverse spiral pattern; 15. movable grinding structure; 16. strip groove; 20. motion seat; 21. screw nut sleeve; 22. traction arm; 23. motor seat; 24. uniform speed motor; 25. small gear; 26. large gear; 27. Rotating column; 28. Connecting bearing; 30. Grinding truncated table; 31. Limiting shell; 32. Small cylinder; 33. Pneumatic mechanism; 34. Cylinder rod; 35. Push seat; 36. Slide groove; 37. Inclined surface; 40. Centrifugal liquid sprinkling plate; 41. Guide hole; 42. Push rod; 43. Annular centrifugal cavity; 44. Centrifugal guide tube; 45. Sprinkling inclined hole; 46. Liquid inlet; 47. Sealing block; 50. Liquid storage cylinder; 51. Inner cavity; 52. Liquid adding short tube; 53. Sealing cover; 54. Drainage section; 55. Frame; 56. Connecting spring; 60. Hollow coupling; 61. Airbag storage seat; 62. Round airbag; 63. Joint; 64. Raised sphere; 65. Cloth layer; 66. Concave mouth; 67. Cleaning brush; 70. Storage groove. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1

[0034] like Figure 1-10 As shown, this embodiment provides a surface grinding machine for electrolytic polishing pretreatment of circular pipes, including a machine tool seat 1, two sets of end portions of the machine tool seat 1 are symmetrically provided with support frames 2, the support frames 2 play a supporting role, a machine tool lower seat 3 is arranged directly below the machine tool seat 1, and the upper end surface of the machine tool lower seat 3 is provided with a pipe clamp 4 acting on a circular pipe fitting 5 (the pipe clamp 4 is the prior art and will not be repeated), and the circular pipe fitting 5 is centrally placed on the upper end surface of the machine tool lower seat 3.

[0035] Specifically, a bidirectional screw rod 10 is horizontally rotated inside the machine tool seat 1, the middle part of the bidirectional screw rod 10 is set as a rotating shaft, both ends of the bidirectional screw rod 10 are fixed by a bearing seat 11 and the inner wall of the machine tool seat 1, one end of the bidirectional screw rod 10 extends outward and is connected to a servo motor 12 through a coupling, and the servo motor 12 passes through the outer end surface of the machine tool seat 1. Figure 1 and 3 shown.

[0036] The bidirectional screw rod 10 is symmetrically provided with a forward spiral portion 13 and a reverse spiral portion 14, and a movable grinding structure 15 is movably provided on the forward spiral portion 13 and the reverse spiral portion 14. Figure 3 shown.

[0037] Specifically, each set of mobile grinding structures 15 includes a moving seat 20, such as Figure 3 and 4 shown.

[0038] The moving seat 20 is internally provided with a screw nut sleeve 21 (the screw nut sleeve 21 includes a nut for spiral motion) acting on the forward spiral pattern portion 13 and the reverse spiral pattern portion 14. A traction arm 22 is welded to the lower end of the moving seat 20. The lower end surface of the machine tool seat 1 is provided with a strip groove 16 for the traction arm 22 to move. The strip groove 16 plays a role of limiting guide. Figure 2 and 4 shown.

[0039] The lower end of the traction arm 22 is penetrated by a rotating column 27, and the rotating column 27 and the traction arm 22 are fixed by a connecting bearing 28, and the connecting bearing 28 plays the role of limiting support. Figure 4 and 5 shown.

[0040] Among them, a large gear 26 is sleeved on the rotating column 27, and a small gear 25 is meshed at the lower end of the large gear 26. The small gear 25 is sleeved on the output shaft of the uniform speed motor 24. A motor seat 23 is arranged outside the uniform speed motor 24. The upper end surface of the motor seat 23 is welded to the lower end surface of the traction arm 22. Figure 2 , 4 and 5.

[0041] Furthermore, a grinding table 30 is fixed at the end of the rotating column 27. Figure 5 shown.

[0042] Specifically, a limiting shell 31 is fixed at one end of the grinding table 30 away from the rotating column 27, a small cylinder 32 is horizontally installed in the limiting shell 31, a pneumatic mechanism 33 acting on the small cylinder 32 is arranged outside the limiting shell 31, a cylinder rod 34 is movably arranged inside the small cylinder 32 to extend outward, a push seat 35 is welded to the end of the cylinder rod 34, and both the cylinder rod 34 and the push seat 35 are square structures, and a limiting linear groove for the movement of the push seat 35 is opened in the middle position of the inner part of the grinding table 30, and the limiting linear groove plays a role of limiting guide, such as Figure 5 and 6 shown.

[0043] The air pressure mechanism 33 includes an air storage chamber, an air extraction pump, a pressure pump and multiple groups of air valves. The air storage chamber is used for pressurized gas, the air extraction pump is used for extracting gas, and the pressure pump is used for supplying gas.

[0044] The upper end surface of the push seat 35 is provided with a slide groove 36, and the bottom of the slide groove 36 is provided with an inclined surface 37 (lower on the left and higher on the right). A movable grinder 8 acting on the inner surface of the circular pipe 5 is installed in the slide groove 36. Figure 6 and 7 shown.

[0045] Specifically, the movable grinder 8 includes a slider 81, a chamfered surface 82, a lifting rod 83, a return spring 84, a grinding block 85, and a slot 86. The slider 81 is located in the slot 36. Figure 8 shown.

[0046] In this embodiment, the lower end of the slider 81 is provided with a chamfered surface 82 that fits the inclined surface 37, the upper end of the slider 81 extends out of the slide groove 36 and is welded with a lifting rod 83, the upper end of the lifting rod 83 is provided with a grinding block 85 that acts on the inner surface of the circular pipe 5, and the bottom surface of the grinding block 85 is provided with a slot 86 that acts on the lifting rod 83, and the slot 86 is a detachable structure.

[0047] In this embodiment, a receiving groove 70 for the grinding block 85 to move is opened on the table surface of the grinding table 30, and a return spring 84 connected to the outside of the lifting rod 83 is fixed between the receiving groove 70 and the slider 81. The return spring 84 is used to maintain the relative force between the inclined surface 37 and the beveled surface 82.

[0048] Furthermore, a centrifugal liquid-sprinkling plate 40 is fixed inside the grinding table 30 and on the left side of the push seat 35. Figure 6 and 7 shown.

[0049] Among them, the centrifugal liquid sprinkling plate 40 has an annular centrifugal cavity 43 formed inside, a guide hole 41 is formed at the middle position of the right end surface of the centrifugal liquid sprinkling plate 40, a push rod 42 is welded to the end of the push seat 35 away from the cylinder rod 34, and the push rod 42 passes through the guide hole 41 and extends into the annular centrifugal cavity 43. A sliding seal is used between the push rod 42 and the guide hole 41 to solve the leakage problem, such as Figure 6 and 10 shown.

[0050] The centrifugal guide tubes 44 are evenly distributed around the surface of the centrifugal liquid sprinkling plate 40. The centrifugal guide tubes 44 are used to guide the liquid obliquely. Each group of centrifugal guide tubes 44 is connected to the annular centrifugal chamber 43. The surface of the grinding table 30 is provided with inclined liquid sprinkling holes 45 that act on the centrifugal guide tubes 44, such as Figure 6 and 10 shown.

[0051] A liquid inlet 46 is provided at the middle position of one end of the centrifugal liquid sprinkling plate 40 away from the guide hole 41. A sealing block 47 is movably provided on the liquid inlet 46. The sealing block 47 has a sealing function. The push rod 42 pushes the sealing block 47 to move horizontally and linearly. Fig. 9 and 10 shown.

[0052] Furthermore, a liquid storage cylinder 50 is horizontally arranged inside the rotating column 27, and an inner cavity 51 is opened in the liquid storage cylinder 50, and the inner cavity 51 stores grinding fluid. The upper end of the liquid storage cylinder 50 extends out of the rotating column 27 and is provided with a liquid adding short tube 52. A sealing cover 53 is movably provided on the liquid adding short tube 52 to prevent the liquid from leaking outward. Figure 7 and 9 shown.

[0053] The liquid storage cylinder 50 is sealed and fixed by the outer surface of the drainage section 54 and the centrifugal liquid sprinkling plate 40. The drainage section 54 extends from the inside of the rotating column 27 to the inside of the grinding table 30. A skeleton 55 is provided at the center of the drainage section 54. The skeleton 55 and the inner wall of the drainage section 54 are riveted. The skeleton 55 and the sealing block 47 are connected by a connecting spring 56. After the connecting spring 56 is compressed, an elastic force is generated to drive the sealing block 47 back to the liquid inlet 46. Fig. 9 and 10 shown.

[0054] When the present embodiment is in use, the circular pipe 5 to be processed is first placed on the lower seat 3 of the machine tool, and the circular pipe 5 is centrally clamped by a semi-automatic pipe clamp 4. Then, the servo motor 12 is started to drive the bidirectional screw 10 to rotate at a uniform speed, so that the movable grinding structure 15 at the position of the positive spiral pattern portion 13 and the reverse spiral pattern portion 14 starts to move, and the two groups of moving seats 20 move toward each other (the screw nut sleeve 21 and the spiral pattern act on each other), respectively causing the traction arm 22 to drive the rotating column 27 to move toward the circular pipe 5 along the strip groove 16, so that the two groups of grinding tables 30 are synchronously extended into the circular pipe 5 and stop moving.

[0055] Then, the pneumatic mechanism 33 on the mobile grinding structure 15 is started respectively to supply air into the small cylinder 32, so that the cylinder rod 34 extends outward, driving the push seat 35 to move along the limiting linear groove, so that the slider 81 slides relatively in the slide groove 36 (the inclined surface 37 and the beveled surface 82 act on each other), and at the same time, the slider 81 has a vertical displacement, driving the lifting rod 83 to move outward (the return spring 84 is compressed), so that the grinding block 85 partially extends out of the receiving groove 70 and contacts the inner surface of the circular pipe 5. At this time, the uniform speed motor 24 is started respectively, the small gear 25 rotates, and the large gear 26 rotates with it through meshing, driving the rotating column 27 to rotate at a high speed around the connecting bearing 28, thereby causing the grinding table 30 to make a circular motion, and the grinding block 85 is used to grind the inner rotating surface of the circular pipe 5 to make the inner rotating surface smooth, and the two ends of the circular pipe 5 can be synchronously processed.

[0056] When the push seat 35 moves along the limiting linear groove, the push rod 42 outside the push seat 35 will make a linear motion, pushing open the sealing block 47 at the liquid inlet 46 from the direction of the annular centrifugal chamber 43 (the connecting spring 56 is compressed), so that part of the grinding fluid in the inner cavity 51 continues to enter the annular centrifugal chamber 43 through the drainage section 54. Since the entire centrifugal liquid sprinkling plate 40 will rotate at high speed with the rotating column 27, the grinding fluid in the annular centrifugal chamber 43 will perform centrifugal wall-adhering motion, and will be randomly thrown outward from the centrifugal guide tube 44 at the cavity wall, and will be sprinkled outward from the liquid sprinkling inclined hole 45. A small amount of grinding fluid will fall on the inner rotating surface of the circular pipe 5, which will help reduce the friction between the grinding block 85 and the rotating surface and reduce the shear stress during cutting. Embodiment 2

[0057] Specifically, the end of the air pressure mechanism 33 away from the small cylinder 32 is connected to a hollow shaft 60, an air flow channel is opened inside the hollow shaft 60, the hollow shaft 60 is fixed to the limit shell 31, and plays a role of connection and fixing, and the end of the hollow shaft 60 is fixed to an airbag storage seat 61, such as Fig.11 and 12 shown.

[0058] Among them, a circular airbag 62 is fitted in the airbag receiving seat 61, and a joint 63 for inserting the hollow coupling 60 is provided in the middle position of the end surface of the circular airbag 62, and the joint 63 plays a role of sealing connection. Protruding spheres 64 are evenly distributed on the circumference of the circular airbag 62, and the protruding spheres 64 are made of rubber material with deformation restoration characteristics. Each group of protruding spheres 64 is wrapped with a cloth layer 65, and the cloth layer 65 is in contact with the inner surface of the circular tube 5. Fig.13 shown.

[0059] The circumferential surface of the airbag receiving seat 61 is evenly provided with recessed openings 66 for the protruding spheres 64 to extend out. The protruding spheres 64 are contracted in the recessed openings 66 in a natural state. Fig.12 shown.

[0060] Furthermore, cleaning bristles 67 are evenly connected to the circumference of the airbag receiving seat 61 and on both sides of the recessed opening 66. The cleaning bristles 67 are bent by the inner surface of the circular tube 5. Fig.12 shown.

[0061] Furthermore, the pneumatic mechanism 33 is provided with two sets of joints, one on the left and one on the right, which are respectively connected to the small cylinder 32 and the hollow connecting shaft 60.

[0062] When the present embodiment is in use, after the grinding operation is completed, the air pressure mechanism 33 is turned on to inflate the circular airbag 62 through the hollow connecting shaft 60, so that the circular airbag 62 expands after being inflated. Due to the limitation of the airbag receiving seat 61, the gas is concentrated and transferred to a plurality of groups of raised spheres 64, so that after the raised spheres 64 are inflated, they partially extend out of the recessed opening 66 and fully contact the inner rotating surface of the circular tube 5 (the rotating surface is already smooth). Then the rotating column 27 drives the airbag receiving seat 61 to rotate at a high speed, and at the same time the traction arm 22 pulls the airbag receiving seat 61 to slowly return to the outside of the tube, causing the raised sphere 64 to move. The cloth layer 65 outside the raised sphere 64 can be used to clean and wipe the inside of the tube after grinding. At the same time, a plurality of groups of cleaning bristles 67 make circular motions to clean the inner wall of the tube and remove the residues in the tube. Embodiment 3

[0063] On the basis of the first and second embodiments, there are residues on the surface of the grinding block 85 and the cloth layer 65 after use. If they are not cleaned in time, secondary pollution will be caused. At the same time, the high temperature carried by the grinding block 85 takes a long time to cool naturally. In order to solve the above technical problems, we symmetrically set cleaning devices 9 on both sides of the lower seat 3 of the machine tool, such as Fig.11 and 14 shown.

[0064] Specifically, the cleaning device 9 includes a cleaning outer seat 91, a connecting rod 92, a through port 93, an annular inner cleaning groove 94, a side stop 95 and a drain pipe 96. Fig.14 shown.

[0065] In this embodiment, the bottoms of the two groups of cleaning outer seats 91 are respectively welded through connecting rods 92 and the end faces of the lower seat 3 of the machine tool. A through opening 93 is opened through the middle of the cleaning outer seat 91. The through opening 93 is used for the grinding table 30 and the airbag storage seat 61 to enter and exit. The area of ​​the through opening 93 is slightly larger than the latter two.

[0066] In this embodiment, an annular inner cleaning groove 94 is provided on the inner side surface of the cleaning outer seat 91 for the raised sphere 64 and the grinding block 85 to extend into. The cross-section of the annular inner cleaning groove 94 is concave, which has the function of preventing liquid from splashing and diverting liquid downward. Clean water is placed at the bottom of the annular inner cleaning groove 94, and side steps 95 are symmetrically arranged on both sides of the annular inner cleaning groove 94 for cleaning the inner side surface of the outer seat 91. The side steps 95 play a blocking role to prevent waste water from overflowing. A sewage pipe 96 is provided at the bottom of the annular inner cleaning groove 94, and a control valve is installed in the sewage pipe 96. When the control valve is opened, the waste water in the annular inner cleaning groove 94 can be discharged outward through the sewage pipe 96.

[0067] When the present embodiment is in use, the servo motor 12 is rotated in the reverse direction to drive the two groups of mobile grinding structures 15 to return to their original positions. The grinding table 30 is first allowed to enter the through opening 93 during the movement, and the grinding block 85 is extended to partially enter the interior of the annular inner cleaning groove 94. The grinding block 85 is driven by the rotating column 27 to make a circular motion so as to fully contact with the clean water in the groove, thereby enabling the grinding block 85 to be fully cleaned.

[0068] Then, the airbag receiving seat 61 enters into the through opening 93 during the movement, and allows several groups of raised balls 64 to expand and extend, partially entering into the interior of the annular inner cleaning groove 94. The rotating column 27 drives the airbag receiving seat 61 to make a circular motion, so that several groups of raised balls 64 can be fully cleaned.

[0069] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0070] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A surface grinding machine tool for electrolytic polishing pretreatment of circular pipes, comprising a machine tool base (1), characterized in that: The two groups of ends of the machine tool seat (1) are symmetrically provided with support frames (2); a bidirectional screw rod (10) is horizontally rotatably provided inside the machine tool seat (1); both ends of the bidirectional screw rod (10) are fixed by a bearing seat (11) and the inner wall of the machine tool seat (1); one end of the bidirectional screw rod (10) extends outward and is connected to a servo motor (12) through a coupling; the servo motor (12) passes through the outer end surface of the machine tool seat (1); a forward spiral pattern portion (13) and a reverse spiral pattern portion (14) are symmetrically distributed on the bidirectional screw rod (10); and a movable grinding structure (15) is movably provided on the forward spiral pattern portion (13) and the reverse spiral pattern portion (14); Each group of the mobile grinding structures (15) comprises a moving seat (20), a screw nut sleeve (21) acting on the forward spiral pattern portion (13) and the reverse spiral pattern portion (14) is installed inside the moving seat (20), a traction arm (22) is welded to the lower end of the moving seat (20), a strip groove (16) for the traction arm (22) to move is opened on the lower end surface of the upper seat (1) of the machine tool, a rotating column (27) is installed through the lower end of the traction arm (22), and the rotating column (27) and the traction arm (22) are fixed by a connecting bearing (28); A grinding table (30) is fixed at the end of the rotating column (27); a limiting shell (31) is fixed at one end of the grinding table (30) away from the rotating column (27); a small cylinder (32) is horizontally installed in the limiting shell (31); a pneumatic mechanism (33) acting on the small cylinder (32) is arranged outside the limiting shell (31); a cylinder rod (34) is movably arranged inside the small cylinder (32) and extending outward; a push seat (35) is welded to the end of the cylinder rod (34); a limiting linear groove for movement of the push seat (35) is provided at the middle position inside the grinding table (30); a slide groove (36) is provided on the upper end surface of the push seat (35); an inclined surface (37) is provided at the bottom of the slide groove (36); a movable grinder (8) acting on the inner surface of the circular pipe (5) is installed in the slide groove (36); A machine tool lower seat (3) is arranged directly below the machine tool upper seat (1), and a pipe clamp (4) for acting on a circular pipe fitting (5) is arranged on the upper end surface of the machine tool lower seat (3), and the circular pipe fitting (5) is centrally placed on the upper end surface of the machine tool lower seat (3).

2. A surface grinding machine for electrolytic polishing pretreatment of circular pipes according to claim 1, characterized in that: A large gear (26) is sleeved on the rotating column (27), a small gear (25) is meshedly arranged at the lower end of the large gear (26), the small gear (25) is sleeved on the output shaft of the uniform speed motor (24), a motor seat (23) is arranged outside the uniform speed motor (24), and the upper end surface of the motor seat (23) is welded to the lower end surface of the traction arm (22).

3. A surface grinding machine for electrolytic polishing pretreatment of circular pipes according to claim 1, characterized in that: The movable grinder (8) comprises a slider (81), a chamfered surface (82), a lifting rod (83), a return spring (84), a grinding block (85), and a slot (86). The slider (81) is located in the slide slot (36). The lower end of the slider (81) is provided with a chamfered surface (82) that fits the inclined surface (37). The upper end of the slider (81) extends out of the slide slot (36) and is welded with a lifting rod (83). The upper end of the lifting rod (83) is provided with a grinding block (85) that acts on the inner surface of the circular pipe (5). The bottom surface of the grinding block (85) is provided with a slot (86) that acts on the lifting rod (83). The surface of the grinding table (30) is provided with a receiving groove (70) for the grinding block (85) to move. A return spring (84) that is sleeved on the outer side of the lifting rod (83) is fixed between the receiving groove (70) and the slider (81).

4. A surface grinding machine for electrolytic polishing pretreatment of circular pipes according to claim 3, characterized in that: A centrifugal liquid sprinkling plate (40) is fixed inside the grinding truncated table (30) and on the left side of the push seat (35). An annular centrifugal cavity (43) is provided inside the centrifugal liquid sprinkling plate (40). A guide hole (41) is provided at the middle position of the right end surface of the centrifugal liquid sprinkling plate (40). A push rod (42) is welded to one end of the push seat (35) away from the cylinder rod (34). The push rod (42) passes through the guide hole (41) and extends into the annular centrifugal cavity (43). Centrifugal guide tubes (44) are evenly distributed around the surface of the centrifugal liquid sprinkling plate (40). Each group of the centrifugal guide tubes (44) is connected to the annular centrifugal cavity (43). The surface of the grinding truncated table (30) is provided with inclined liquid sprinkling holes (45) that act on the centrifugal guide tubes (44) respectively.

5. A surface grinding machine tool for electrolytic polishing pretreatment of circular pipes according to claim 4, characterized in that: A liquid inlet (46) is provided at a middle position of one end of the centrifugal liquid-sprinkling plate (40) away from the guide hole (41), a sealing block (47) is movably provided on the liquid inlet (46), and the push rod (42) pushes the sealing block (47) to move horizontally and linearly.

6. A surface grinding machine tool for electrolytic polishing pretreatment of circular pipes according to claim 5, characterized in that: A liquid storage cylinder (50) is horizontally arranged inside the rotating column (27), and an inner cavity (51) is provided inside the liquid storage cylinder (50). Grinding fluid is stored in the inner cavity (51). The upper end of the liquid storage cylinder (50) extends out of the rotating column (27) and is provided with a liquid adding short tube (52). A sealing cover (53) is movably provided on the liquid adding short tube (52).

7. A surface grinding machine tool for electrolytic polishing pretreatment of circular pipes according to claim 6, characterized in that: The liquid storage cylinder (50) is sealed and fixed by the outer surface of the drainage section (54) and the centrifugal liquid sprinkling plate (40); a frame (55) is provided at the center of the drainage section (54); the frame (55) and the inner wall of the drainage section (54) are riveted; and the frame (55) and the sealing block (47) are connected by a connecting spring (56).

8. The surface grinding machine tool for electrolytic polishing pretreatment of circular pipes according to claim 1, characterized in that: The end of the air pressure mechanism (33) away from the small cylinder (32) is connected to a hollow coupling (60), the hollow coupling (60) is fixed to the limit shell (31), an airbag receiving seat (61) is fixed to the end of the hollow coupling (60), a circular airbag (62) is fitted in the airbag receiving seat (61), a joint (63) for inserting the hollow coupling (60) is provided in the middle of the end surface of the circular airbag (62), and the circular airbag (62) is provided with a joint (63) for inserting the hollow coupling (60). The circumferential surface of the airbag receiving seat (62) is uniformly distributed with protruding spheres (64), each group of the protruding spheres (64) is wrapped with a cloth layer (65), the cloth layer (65) is in contact with the inner surface of the circular tube (5), the circumferential surface of the airbag receiving seat (61) is uniformly provided with recessed openings (66) for the protruding spheres (64) to extend out, and cleaning bristles (67) are uniformly connected on the circumferential surface of the airbag receiving seat (61) and on both sides of the recessed openings (66).

9. A surface grinding machine tool for electrolytic polishing pretreatment of circular pipes according to claim 8, characterized in that: Cleaners (9) are symmetrically arranged on both sides of the machine tool lower seat (3), and the cleaners (9) include a cleaning outer seat (91), a connecting rod (92), a through-port (93), an annular inner cleaning groove (94), a side stop (95) and a sewage pipe (96). The bottoms of the two groups of cleaning outer seats (91) are respectively welded through the connecting rod (92) and the end surface of the machine tool lower seat (3). The middle part of the cleaning outer seat (91) is penetrated by a through-port (93), and the through-port (93) is used for accommodating the grinding round table (30) and the airbag. The inner side surface of the cleaning outer seat (91) is provided with an annular inner cleaning groove (94) for the protruding sphere (64) and the grinding block (85) to extend into, the cross section of the annular inner cleaning groove (94) is concave, clean water is placed at the bottom of the annular inner cleaning groove (94), the inner side surface of the cleaning outer seat (91) is symmetrically provided with side steps (95) on both sides of the annular inner cleaning groove (94), and the bottom of the annular inner cleaning groove (94) is downwardly connected and connected with a sewage pipe (96).

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