A surface grinding machine tool for pretreatment of circular pipes by electrolytic polishing

Abstract

This invention relates to the field of rotating surface grinding technology for pipe fittings, and discloses a surface grinding machine tool for electrolytic polishing pretreatment of circular pipes. The machine tool includes a machine base with symmetrically arranged support frames at its two ends. A bidirectional lead screw is horizontally rotatably mounted inside the machine base, with both ends of the lead screw fixed to the inner wall of the machine base via bearing seats. The invention utilizes a cylinder rod extending outwards. On one hand, it drives a pusher to move along a limiting linear groove. Through a series of transmissions, a portion of the grinding block extends out of the receiving groove and contacts the inner surface of the circular pipe fitting, grinding the inner rotating surface of the pipe fitting. On the other hand, a push rod outside the pusher moves linearly, opening the sealing block at the liquid inlet, allowing the grinding fluid in the inner cavity to enter the annular centrifugal chamber through the drainage section. The grinding fluid in the annular centrifugal chamber undergoes centrifugal wall-attaching motion and is randomly thrown outwards from the centrifugal guide tube at the chamber wall, spraying outwards from the spraying oblique hole.

Description

Technical Field

[0001] This invention relates to the field of rotary surface grinding technology for pipe fittings, and particularly to a surface grinding machine tool for electrolytic polishing pretreatment of circular pipes. Background Technology

[0002] Steel pipes are made by piercing steel ingots or solid round steel to form a rough tube, which is then hot-rolled, cold-rolled, or cold-drawn. They are commonly used in refrigeration, heating, ventilation, water pipes, steam pipes, oil pipes, and many other fields. When processing steel pipes, the rough inner surface of the steel pipe needs to be ground on both sides to make the inner surface uniform before it can be connected with other steel pipes. Therefore, grinding machines are used.

[0003] Existing steel pipe grinding machines have several technical drawbacks. First, the inside of both ends of the steel pipe needs to be ground separately using grinding machines, which is time-consuming and labor-intensive, resulting in low work efficiency. Second, grinding fluid reduces friction between the tool and the workpiece through lubrication, improves material removal rate, and maintains workpiece surface quality. Grinding fluid also absorbs a large amount of heat generated during grinding through cooling, reducing the risk of thermal deformation of the workpiece. Currently, steel pipe grinding machines generally rely on manual spraying of grinding fluid into the pipe, which is not uniform and has a low degree of automation. Third, after the grinding operation, sticky waste material remains inside the steel pipe after being contaminated with the fluid, which is difficult to wash off directly with water, making cleaning time-consuming and labor-intensive.

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

[0005] The main objective of this invention is to provide a surface grinding machine tool for pretreatment of circular pipe electrolytic polishing, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A surface grinding machine tool for pretreatment of circular pipe electrolytic polishing includes a machine base, with two sets of support frames symmetrically arranged at the ends of the machine base. The number of support frames is preferably 4-8 sets. A bidirectional lead screw is horizontally rotatably arranged inside the machine base. Both ends of the bidirectional lead screw are fixed to the inner wall of the machine base through bearing seats. One end of the bidirectional lead screw extends outward and is connected to a servo motor through a coupling. The servo motor passes through the outer end face of the machine base.

[0007] As a preferred embodiment of the surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to the present invention, wherein: the bidirectional lead screw has a forward spiral groove and a reverse spiral groove symmetrically distributed, and both the forward spiral groove and the reverse spiral groove are movably provided with a movable grinding structure, and the number of movable grinding structures is 2 sets.

[0008] As a preferred embodiment of the surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to the present invention, each group of the movable grinding structures includes a motion seat, and a lead screw nut sleeve acting on the forward spiral thread and the reverse spiral thread is installed inside the motion seat. A traction arm is welded to the lower end of the motion seat. A strip groove for the movement of the traction arm is opened on the lower end face of the upper part of the machine tool. A rotating column is installed through the lower end of the traction arm. The rotating column and the traction arm are fixed by a connecting bearing.

[0009] As a preferred embodiment of the surface grinding machine tool for pretreatment of electrolytic polishing of circular pipes according to the present invention, wherein: a grinding frustum is fixed at the end of the rotating column, a limiting shell is fixed at the end of the grinding frustum away from the rotating column, a small cylinder is horizontally installed inside the limiting shell, a pneumatic mechanism acting on the small cylinder is provided outside the limiting shell, a cylinder rod is movably provided extending outward from the inside of the small cylinder, a push seat is welded to the end of the cylinder rod, a limiting linear groove for the push seat to move is opened in the middle of the inside of the grinding frustum, a sliding groove is opened on the upper end surface of the push seat, and an inclined surface is provided at the bottom of the sliding groove.

[0010] As a preferred embodiment of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes according to the present invention, wherein: a movable grinder acting on the inner surface of the circular pipe is installed in the slide groove.

[0011] As a preferred embodiment of the surface grinding machine tool for electrolytic polishing pretreatment of circular pipes according to the present invention, a lower machine tool base is provided directly below the upper machine tool base, and a pipe clamp acting on the circular pipe is provided on the upper end face of the lower machine tool base, with the circular pipe centrally placed on the upper end face of the lower machine tool base.

[0012] As a preferred embodiment of the surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to the present invention, wherein: 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 base is provided outside the uniform speed motor, and the upper end face of the motor base and the lower end face of the traction arm are welded together.

[0013] As a preferred embodiment of the surface grinding machine tool for pretreatment of electrolytic polishing of circular pipes according to the present invention, the movable grinder includes a slider, a beveled surface, a lifting rod, a return 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 beveled surface that fits against 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 grinding table is provided with a storage groove for the movement of the grinding block. A return spring sleeved on the outside of the lifting rod is fixed between the storage groove and the slider.

[0014] As a preferred embodiment of the surface grinding machine tool for pretreatment of electrolytic polishing of circular pipes according to the present invention, wherein: a centrifugal spraying plate is fixed inside the grinding frustum and located on the left side of the pusher; an annular centrifugal cavity is formed inside the centrifugal spraying plate; a guide hole is formed at the middle position of the right end face of the centrifugal spraying plate; a push rod is welded to the end of the pusher 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 spraying plate; each group of centrifugal guide tubes is connected to the annular centrifugal cavity; and spraying oblique holes acting on the centrifugal guide tubes are formed on the surface of the grinding frustum; the number of centrifugal guide tubes and spraying oblique holes is preferably 4-10 groups.

[0015] As a preferred embodiment of the surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to the present invention, wherein: a liquid inlet is provided at the middle position of one end of the centrifugal spraying plate away from the guide hole, a sealing block is movably provided on the liquid inlet, and the push rod pushes the sealing block to move horizontally in a straight line.

[0016] As a preferred embodiment of the surface grinding machine tool for pretreatment of electrolytic polishing of circular pipes according to the present invention, wherein: a liquid storage cylinder is provided inside the rotating column, the liquid storage cylinder has an inner cavity, the inner cavity stores grinding fluid, the upper end of the liquid storage cylinder extends out of the rotating column and is provided with a liquid addition short pipe, and a sealing cap is movably provided on the liquid addition short pipe.

[0017] As a preferred embodiment of the surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to the present invention, the liquid storage cylinder is sealed and fixed by the outer surface of the diversion section and the centrifugal spraying plate, a skeleton is provided at the center of the diversion section, the skeleton is riveted to the inner wall of the diversion section, and the skeleton and the sealing block are connected by a connecting spring.

[0018] As a preferred embodiment of the surface grinding machine tool for pre-treatment of electrolytic polishing of circular pipes according to the present invention, wherein: the end of the pneumatic mechanism away from the small cylinder is connected to a hollow coupling, the hollow coupling is fixed to a limiting shell, an airbag storage seat is fixed to the end of the hollow coupling, a circular airbag is fitted inside the airbag storage seat, a connector for inserting the hollow coupling is provided at the middle position of the end face of the circular airbag, raised spheres are evenly distributed on the circumference of the circular airbag, the number of raised spheres is preferably 3-6 groups, each group of raised spheres is wrapped with a cloth layer, the cloth layer is in contact with the inner surface of the circular pipe, recesses for the raised spheres to extend are evenly opened on the circumference of the airbag storage seat, the number of recesses is preferably 3-6 groups, and cleaning bristles are evenly connected on the circumference of the airbag storage seat and on both sides of the recesses.

[0019] As a preferred embodiment of the surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to the present invention, wherein: two sets of cleaners are symmetrically arranged on both sides of the machine tool base, each cleaner including an outer cleaning seat, a connecting rod, a through port, an annular inner cleaning groove, side steps, and a drain pipe; the bottoms of the two sets of outer cleaning seats are welded to the end faces of the machine tool base via connecting rods; a through port is provided in the middle of the outer cleaning seat for the grinding frustum and airbag housing to enter and exit; an annular inner cleaning groove is provided on the inner side of the outer cleaning seat for the protruding sphere and grinding block to extend into; the cross-section of the annular inner cleaning groove is concave; clean water is placed at the bottom of the annular inner cleaning groove; side steps are symmetrically arranged on the inner side of the outer cleaning seat on both sides of the annular inner cleaning groove; and a drain pipe is provided downwardly connected to the bottom of the annular inner cleaning groove.

[0020] As a preferred embodiment of the surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to the present invention, a control valve is installed inside the drain pipe.

[0021] In a preferred embodiment of the surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to the present invention, the middle part of the bidirectional lead screw is configured as a rotating shaft.

[0022] As a preferred embodiment of the surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to the present invention, wherein: the guide section extends from the inside of the rotating column into the inside of the grinding table.

[0023] As a preferred embodiment of the surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to the present invention, the push rod and the guide hole adopt a sliding seal.

[0024] As a preferred embodiment of the surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to the present invention, the pneumatic mechanism includes an air storage chamber, an air pump and a pressure pump.

[0025] As a preferred embodiment of the surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to 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 embodiment of the surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to the present invention, the convex sphere is made of rubber material with deformation and recovery characteristics.

[0027] This invention provides an improved surface grinding machine tool for the pretreatment of electrolytic polishing of circular pipes, which has the following significant improvements and advantages compared with the prior art: The servo motor is started, driving the bidirectional lead screw to rotate at a constant speed. The moving grinding structure begins to move, and the two sets of moving seats move towards each other, causing the traction arm to move along the strip groove and drive the rotating column towards the circular tube. This allows the two grinding turrets to extend into the circular tube synchronously, enabling synchronous grinding of the inner surfaces of both ends of the tube, thereby improving work efficiency.

[0028] The cylinder rod extends outward, driving the pusher to move along the limiting linear groove. Through a series of transmissions, the grinding block extends partially out of the receiving groove and contacts the inner surface of the circular tube. The grinding block grinds the inner rotating surface of the circular tube. On the other hand, the push rod outside the pusher moves linearly, pushing open the sealing block at the liquid inlet, allowing some of the grinding fluid in the inner cavity to enter the annular centrifugal chamber through the drainage section. The grinding fluid in the annular centrifugal chamber undergoes centrifugal wall-attaching motion and is randomly thrown outward from the centrifugal guide tube at the cavity wall, spraying outward from the spraying oblique hole. A small amount of grinding fluid falls onto the inner rotating surface of the circular tube. By making reasonable use of the power of the rotating column, automatic spraying is achieved, saving time and effort, and ensuring more uniform spraying. The overall linkage of the structure is improved.

[0029] Inflating the hollow, axially connected circular airbag, the gas is concentrated and transferred to several sets of raised spheres. After inflation, the raised spheres partially extend out of the recessed opening and fully contact the inner rotating surface of the circular tube. The rotating column drives the airbag storage seat to rotate at high speed, while the traction arm pulls the airbag storage seat to return to its original position. The combined effect causes the raised spheres to move. The cloth layer outside the raised spheres cleans and wipes the inside of the tube after grinding, while several sets of cleaning bristles perform circumferential motion to clean the inner wall of the tube. The combination of these two methods efficiently removes residues inside the tube and has a high degree of automation.

[0030] When a portion of the grinding block or raised ball enters the annular inner cleaning tank, the rotating column drives the grinding block or raised ball to make circular motion, allowing it to fully contact the clean water in the tank. Through the impact force of the water flow, the grinding block or raised ball can be thoroughly cleaned, achieving timely cleaning while saving time and effort. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of a surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to the present invention, taken from one direction. Figure 2 This is a schematic diagram of the overall structure of a surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to the present invention from another direction; Figure 3 This is a schematic diagram of the internal structure of the machine tool upper of the present invention; Figure 4 This is a schematic diagram of the external structure of the movable grinding structure of the present invention; Figure 5 This is a schematic diagram of the external structure of the rotating column of the present invention; Figure 6 This is a schematic diagram of the internal structure of the grinding frustum of the present invention; Figure 7 This is a schematic diagram of the internal structure of the rotating column of the present invention; Figure 8 This is a schematic diagram of the specific structure of the movable grinder of the present invention; Figure 9 This is a cross-sectional view of the liquid storage cylinder and the drainage section of the present invention; Figure 10 This is a schematic diagram of the centrifugal spraying disc of the present invention; Figure 11 This is a schematic diagram showing the installation positions of the airbag storage base and the cleaner of the present invention; Figure 12 This is a schematic diagram of the external structure of the airbag storage base of the present invention; Figure 13 This is a schematic diagram of the internal structure of the airbag storage base of the present invention; Figure 14 This is a schematic diagram of the specific structure of the cleaner of the present invention.

[0032] In the diagram: 1. Machine tool base; 2. Support frame; 3. Machine tool lower base; 4. Pipe clamp; 5. Circular pipe fitting; 8. Movable grinder; 81. Slider; 82. Beveled 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 step; 96. Drain pipe; 10. Bidirectional lead screw; 11. Bearing seat; 12. Servo motor; 13. Forward spiral groove; 14. Reverse spiral groove; 15. Movable grinding structure; 16. Strip groove; 20. Motion seat; 21. Lead screw nut sleeve; 22. Traction arm; 23. Motor seat; 24. Uniform speed motor; 25. Pinion; 26. Large gear; 27. Rotating column; 28. Connecting bearing; 30. Grinding frustum; 31. Limiting shell; 32. Small cylinder; 33. Pneumatic mechanism; 34. Cylinder rod; 35. Push seat; 36. Slide groove; 37. Inclined surface; 40. Centrifugal spraying plate; 41. Guide hole; 42. Push rod; 43. Annular centrifugal chamber; 44. Centrifugal guide tube; 45. Spraying oblique hole; 46. Liquid inlet; 47. Sealing block; 50. Liquid storage cylinder; 51. Inner cavity; 52. Liquid addition short tube; 53. Sealing cap; 54. Drainage section; 55. Skeleton; 56. Connecting spring; 60. Hollow coupling; 61. Airbag storage seat; 62. Circular airbag; 63. Connector; 64. Raised sphere; 65. Cloth layer; 66. Recessed opening; 67. Cleaning bristles; 70. Storage groove. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0034] like Figure 1-10 As shown, this embodiment provides a surface grinding machine tool for electrolytic polishing pretreatment of circular pipes, including a machine upper seat 1, with support frames 2 symmetrically arranged at two ends of the machine upper seat 1, the support frames 2 serving a supporting function, and a machine lower seat 3 arranged directly below the machine upper seat 1, with a pipe clamp 4 (the pipe clamp 4 is prior art and will not be described in detail) acting on the upper surface of the machine lower seat 3, the circular pipe 5 being centrally placed on the upper surface of the machine lower seat 3.

[0035] Specifically, a bidirectional lead screw 10 is horizontally rotatable inside the machine tool base 1. The middle part of the bidirectional lead screw 10 is configured as a rotating shaft. Both ends of the bidirectional lead screw 10 are fixed to the inner wall of the machine tool base 1 via bearing seats 11. One end of the bidirectional lead screw 10 extends outward and is connected to a servo motor 12 via a coupling. The servo motor 12 passes through the outer end face of the machine tool base 1. Figure 1 and 3 As shown.

[0036] The bidirectional lead screw 10 has symmetrically distributed forward spiral threads 13 and reverse spiral threads 14, and both the forward spiral threads 13 and the reverse spiral threads 14 are movably equipped with movable grinding structures 15, such as... Figure 3 As shown.

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

[0038] The motion seat 20 has a lead screw nut sleeve 21 (containing a nut for helical movement) installed inside, which acts on the forward helical thread 13 and the reverse helical thread 14. A traction arm 22 is welded to the lower end of the motion seat 20. A strip groove 16 for the movement of the traction arm 22 is provided on the lower end face of the machine tool seat 1. The strip groove 16 serves as a limiting and guiding function. Figure 2 and 4 As shown.

[0039] A rotating column 27 is installed through the lower end of the traction arm 22. The rotating column 27 and the traction arm 22 are fixed together by a connecting bearing 28, which serves as a limiting support. Figure 4 and 5 As shown.

[0040] 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 constant speed motor 24. A motor base 23 is provided outside the constant speed motor 24, and the upper end face of the motor base 23 is welded to the lower end face of the traction arm 22. Figure 2 , 4 As shown in Figure 5.

[0041] Furthermore, a grinding frustum 30 is fixed to the end of the rotating column 27, such as... Figure 5 As shown.

[0042] Specifically, a limiting shell 31 is fixed at the end of the grinding table 30 away from the rotating column 27. A small cylinder 32 is horizontally installed inside the limiting shell 31. A pneumatic mechanism 33 acting on the small cylinder 32 is provided outside the limiting shell 31. A cylinder rod 34 is movably arranged outward from the inside of the small cylinder 32. A pusher 35 is welded to the end of the cylinder rod 34. Both the cylinder rod 34 and the pusher 35 are square structures. A limiting linear groove for the pusher 35 to move is opened in the middle of the interior of the grinding table 30. The limiting linear groove plays a limiting and guiding role, such as... Figure 5 and 6 As shown.

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

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

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

[0046] In this embodiment, the lower end of the slider 81 is provided with a beveled surface 82 that fits against the inclined surface 37. The upper end of the slider 81 extends out of the 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 tube 5. The bottom surface of the grinding block 85 is provided with a slot 86 that acts on the lifting rod 83. The slot 86 is a detachable structure.

[0047] In this embodiment, a storage groove 70 for the movement of the grinding block 85 is provided on the table surface of the grinding table 30. A return spring 84 sleeved on the outside of the lifting rod 83 is fixed between the storage groove 70 and the slider 81. The return spring 84 is used to maintain the relative force between the inclined surface 37 and the oblique surface 82.

[0048] Furthermore, a centrifugal spraying disc 40 is fixed inside the grinding frustum 30 and located on the left side of the pusher 35, such as... Figure 6 and 7 As shown.

[0049] The centrifugal spraying disc 40 has an annular centrifugal chamber 43 inside. A guide hole 41 is located at the center of the right end face of the centrifugal spraying disc 40. A push rod 42 is welded to the 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 chamber 43. A sliding seal is used between the push rod 42 and the guide hole 41 to solve the leakage problem. Figure 6 and 10 As shown.

[0050] Centrifugal guide tubes 44 are evenly distributed around the circumference of the centrifugal spraying disc 40. These guide tubes 44 are used for oblique liquid guidance. Each set of centrifugal guide tubes 44 is connected to the annular centrifugal chamber 43. The grinding frustum 30 has oblique spraying holes 45 on its surface that act on the centrifugal guide tubes 44. Figure 6 and 10 As shown.

[0051] The centrifugal spraying disc 40 has a liquid inlet 46 located at the middle of the end furthest from the guide hole 41. A sealing block 47 is movably mounted on the liquid inlet 46, and the sealing block 47 has a sealing function. The push rod 42 pushes the sealing block 47 to move horizontally in a linear motion. Figure 9 and 10 As shown.

[0052] Furthermore, a liquid storage cylinder 50 is horizontally arranged inside the rotating column 27. The liquid storage cylinder 50 has an inner cavity 51 containing grinding fluid. A short liquid inlet tube 52 extends from the upper end of the liquid storage cylinder 50 outside the rotating column 27. A sealing cap 53 is movably installed on the short liquid inlet tube 52 to prevent leakage. Figure 7 and 9 As shown.

[0053] The liquid storage cylinder 50 is sealed and fixed by the outer surface of the guide section 54 and the centrifugal spraying plate 40. The guide section 54 extends from the inside of the rotating column 27 into the inside of the grinding frustum 30. A frame 55 is provided at the center of the guide section 54. The frame 55 is riveted to the inner wall of the guide section 54. The frame 55 and the sealing block 47 are connected by a connecting spring 56. When the connecting spring 56 is compressed, it generates an elastic force that drives the sealing block 47 back to the liquid inlet 46. Figure 9 and 10 As shown.

[0054] In this embodiment, the circular tube 5 to be processed is first placed on the machine tool base 3. The semi-automatic tube clamp 4 is used to clamp the circular tube 5 in the center. Then, the servo motor 12 is started, which drives the bidirectional lead screw 10 to rotate at a constant speed. This causes the movable grinding structure 15 at the positions of the forward spiral part 13 and the reverse spiral part 14 to start moving. The two sets of moving seats 20 move towards each other (the lead screw nut sleeve 21 and the spiral pattern interact), which causes the traction arm 22 to move along the strip groove 16 and drive the rotating column 27 towards the circular tube 5. This causes the two sets of grinding tables 30 to extend into the circular tube 5 simultaneously and stop moving.

[0055] Then, the pneumatic mechanism 33 on the movable grinding structure 15 is activated to supply air to the small cylinder 32, causing the cylinder rod 34 to extend outward and drive the pusher 35 to move along the limiting linear groove. This causes the slider 81 to slide relative to the slide groove 36 (the inclined surface 37 and the oblique cutting surface 82 interact), and at the same time, the slider 81 has a vertical displacement, which drives the lifting rod 83 to move outward (the return spring 84 is compressed). This causes the grinding block 85 to partially extend out of the receiving groove 70 and contact the inner surface of the circular tube 5. At this time, the uniform speed motor 24 is activated, the small gear 25 rotates, and through meshing, the large gear 26 rotates as well, driving the rotating column 27 to rotate at high speed around the connecting bearing 28, thereby causing the grinding frustum 30 to perform circumferential motion. The grinding block 85 is used to grind the inner rotating surface of the circular tube 5, making the inner rotating surface smooth. The two ends of the circular tube 5 can be processed synchronously.

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

[0057] Specifically, the end of the pneumatic mechanism 33 furthest from the small cylinder 32 is connected to a hollow coupling 60. An airflow channel is provided inside the hollow coupling 60. The hollow coupling 60 and the limiting shell 31 are fixed together, serving a connecting and fixing function. An airbag storage seat 61 is fixed to the end of the hollow coupling 60. Figure 11 and 12 As shown.

[0058] The airbag housing 61 contains a circular airbag 62 fitted inside. A connector 63 for inserting a hollow coupling 60 is located at the center of the end face of the circular airbag 62. The connector 63 provides a sealing connection. Raised spheres 64 are evenly distributed on the circumference of the circular airbag 62. These raised spheres 64 are made of rubber with deformation-restoring properties. Each set of raised spheres 64 is wrapped with a cloth layer 65, which contacts the inner surface of the circular tube 5. Figure 13 As shown.

[0059] The airbag housing 61 has evenly spaced recesses 66 on its circumferential surface for the protruding spheres 64 to extend out. The protruding spheres 64 retract into the recesses 66 in their natural state. Figure 12 As shown.

[0060] Furthermore, cleaning bristles 67 are evenly connected to the circumferential surface of the airbag storage seat 61 and on both sides of the recess 66. The cleaning bristles 67 are bent by the inner surface of the circular tube 5, such as... Figure 12 As shown.

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

[0062] In this embodiment, after the grinding operation is completed, the pneumatic mechanism 33 is activated, and air is injected into the circular airbag 62 through the hollow coupling 60. After the circular airbag 62 is inflated, it expands. Due to the limitation of the airbag storage seat 61, the gas is concentrated and transferred to several sets of protruding balls 64. After the protruding balls 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 storage seat 61 to rotate at high speed. At the same time, the traction arm 22 pulls the airbag storage seat 61 to slowly return to its original position in the direction of the tube, causing the protruding balls 64 to move. The cloth layer 65 outside the protruding balls 64 can be used to clean and wipe the inside of the tube after grinding. At the same time, several sets of cleaning bristles 67 make circular motions to clean the inner wall of the tube and remove the residue inside the tube. Example 3

[0063] Based on Examples 1 and 2, residues remain on the surfaces of both the grinding block 85 and the cloth layer 65 after use. Failure to clean them promptly will cause secondary contamination. Furthermore, the high temperature carried by the grinding block 85 requires a long time to cool naturally. To address these technical issues, we have symmetrically installed cleaners 9 on both sides of the machine tool base 3. Figure 11 and 14 As shown.

[0064] Specifically, the cleaner 9 includes a cleaning outer seat 91, a connecting rod 92, a through port 93, an annular inner cleaning groove 94, a side baffle step 95, and a drain pipe 96, such as Figure 14 As shown.

[0065] In this embodiment, the bottoms of the two sets of cleaning outer seats 91 are welded to the end faces of the machine tool lower seat 3 via connecting rods 92 and machine tool lower seat 3, respectively. A through opening 93 is provided in the middle of the cleaning outer seat 91. The through opening 93 allows the grinding frustum 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 of the outer cleaning seat 91 for the protruding ball 64 and 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 splashing and guiding downward flow. Clean water is placed at the bottom of the annular inner cleaning groove 94. Side steps 95 are symmetrically arranged on the inner side of the outer cleaning seat 91 and on both sides of the annular inner cleaning groove 94. The side steps 95 play a blocking role to prevent wastewater from overflowing. A drain pipe 96 is provided downwardly connected to the bottom of the annular inner cleaning groove 94. A control valve is installed in the drain pipe 96. When the control valve is opened, the wastewater in the annular inner cleaning groove 94 can be discharged to the outside through the drain pipe 96.

[0067] In this embodiment, the servo motor 12 is rotated in reverse to drive the two sets of movable grinding structures 15 back to their original positions. First, the grinding frustum 30 enters the inlet 93 during the movement. Then, the grinding block 85 extends out and partially enters the annular inner cleaning tank 94. By having the rotating column 27 drive the grinding block 85 to make circumferential motion, it can fully contact the clean water in the tank, thus ensuring that the grinding block 85 is thoroughly cleaned.

[0068] Then, during the movement, the airbag storage seat 61 enters the opening 93. By allowing several sets of protruding balls 64 to expand and extend, they partially enter the interior of the annular inner cleaning tank 94. The rotating column 27 drives the airbag storage seat 61 to make a circular motion, which can thoroughly clean the several sets of protruding balls 64.

[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

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

Claims

1. A surface grinding machine tool for pretreatment of electrolytic polishing of circular pipes, comprising a machine tool base (1), characterized in that: The machine tool base (1) is symmetrically provided with support frames (2) at both ends. The machine tool base (1) is horizontally rotatably provided with a two-way lead screw (10). Both ends of the two-way lead screw (10) are fixed to the inner wall of the machine tool base (1) through bearing seats (11). One end of the two-way lead screw (10) extends outward and is connected to a servo motor (12) through a coupling. The servo motor (12) passes through the outer end face of the machine tool base (1). The two-way lead screw (10) is symmetrically provided with a forward spiral thread (13) and a reverse spiral thread (14). Both the forward spiral thread (13) and the reverse spiral thread (14) are movably provided with a movable grinding structure (15). Each of the movable grinding structures (15) includes a motion seat (20), inside which a screw nut sleeve (21) is installed that acts on the forward spiral thread (13) and the reverse spiral thread (14). A traction arm (22) is welded to the lower end of the motion seat (20). A strip groove (16) for the traction arm (22) to move is opened on the lower end face of the machine tool base (1). A rotating column (27) is installed through the lower end of the traction arm (22). The rotating column (27) and the traction arm (22) are fixed together by a connecting bearing (28). A grinding frustum (30) is fixed to the end of the rotating column (27). A limiting shell (31) is fixed to the end of the grinding frustum (30) away from the rotating column (27). A small cylinder (32) is horizontally installed inside the limiting shell (31). A pneumatic mechanism (33) acting on the small cylinder (32) is provided outside the limiting shell (31). A cylinder rod (34) is movably provided inside the small cylinder (32). A push seat (35) is welded to the end of the cylinder rod (34). A limiting straight groove for the push seat (35) to move is provided in the middle of the interior of the grinding frustum (30). A sliding groove (36) is provided on the upper end face of the push seat (35). An inclined surface (37) is provided at the bottom of the sliding groove (36). A movable grinder (8) acting on the inner surface of the circular tube (5) is installed inside the sliding groove (36). A machine tool base (3) is provided directly below the machine tool base (1). A pipe clamp (4) acting on a circular pipe fitting (5) is provided on the upper surface of the machine tool base (3). The circular pipe fitting (5) is placed in the center on the upper surface of the machine tool base (3).

2. The surface grinding machine tool for pretreatment of circular pipe electrolytic polishing according to claim 1, characterized in that: 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 constant speed motor (24). A motor seat (23) is provided outside the constant speed motor (24), and the upper end face of the motor seat (23) is welded to the lower end face of the traction arm (22).

3. A surface grinding machine tool for pretreatment of electrolytic polishing of circular pipes according to claim 1, characterized in that: The movable grinder (8) includes a slider (81), a beveled 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 groove (36). The lower end of the slider (81) is provided with a beveled surface (82) that fits against 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 tube (5). The bottom surface of the grinding block (85) is provided with a slot (86) that acts on the lifting rod (83). The grinding frustum (30) is provided with a storage groove (70) for the grinding block (85) to move. A return spring (84) sleeved on the outside of the lifting rod (83) is fixed between the storage groove (70) and the slider (81).

4. A surface grinding machine tool for pretreatment of electrolytic polishing of circular pipes according to claim 3, characterized in that: A centrifugal spraying disc (40) is fixed inside the grinding frustum (30) and located on the left side of the pusher (35). An annular centrifugal cavity (43) is opened inside the centrifugal spraying disc (40). A guide hole (41) is opened at the middle position of the right end face of the centrifugal spraying disc (40). A push rod (42) is welded to the end of the pusher (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 spraying disc (40). Each set of centrifugal guide tubes (44) is connected to the annular centrifugal cavity (43). Spraying oblique holes (45) that act on the centrifugal guide tubes (44) are opened on the surface of the grinding frustum (30).

5. A surface grinding machine tool for pretreatment of electrolytic polishing of circular pipes according to claim 4, characterized in that: The centrifugal spraying disc (40) has an inlet (46) at the middle position of one end away from the guide hole (41). A sealing block (47) is movably arranged on the inlet (46). The push rod (42) pushes the sealing block (47) to move horizontally in a straight line.

6. A surface grinding machine tool for pretreatment of electrolytic polishing of circular pipes according to claim 5, characterized in that: A liquid storage cylinder (50) is horizontally arranged inside the rotating column (27). An inner cavity (51) is opened inside the liquid storage cylinder (50). Grinding fluid is stored in the inner cavity (51). A liquid addition short pipe (52) is provided on the upper end of the liquid storage cylinder (50) extending out of the rotating column (27). A sealing cap (53) is movably arranged on the liquid addition short pipe (52).

7. A surface grinding machine tool for pretreatment of electrolytic polishing 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 spraying plate (40). A skeleton (55) is provided in the center of the drainage section (54). The skeleton (55) is riveted to the inner wall of the drainage section (54). The skeleton (55) and the sealing block (47) are connected by a connecting spring (56).

8. A surface grinding machine tool for pretreatment of electrolytic polishing of circular pipes according to claim 1, characterized in that: The pneumatic mechanism (33) is connected to a hollow coupling (60) at the end away from the small cylinder (32). The hollow coupling (60) is fixed to the limiting shell (31). An airbag storage seat (61) is fixed to the end of the hollow coupling (60). A circular airbag (62) is fitted inside the airbag storage seat (61). A connector (63) for inserting the hollow coupling (60) is provided at the middle of the end face of the circular airbag (62). (62) has raised spheres (64) evenly distributed on its circumference. Each group of raised 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 airbag storage seat (61) has recessed openings (66) evenly opened on its circumference for the raised spheres (64) to extend out. Cleaning bristles (67) are evenly connected on the circumference of the airbag storage seat (61) and on both sides of the recessed openings (66).

9. A surface grinding machine tool for pretreatment of electrolytic polishing of circular pipes according to claim 8, characterized in that: The machine tool base (3) is symmetrically provided with cleaners (9) on both sides. Each cleaner (9) includes a cleaning outer seat (91), a connecting rod (92), a through port (93), an annular inner cleaning groove (94), a side step (95), and a drain pipe (96). The bottoms of the two sets of cleaning outer seats (91) are welded to the end faces of the machine tool base (3) through the connecting rod (92). The cleaning outer seat (91) has a through port (93) in the middle, which is used for the grinding table (30) and the airbag. The outer cleaning seat (91) is provided with an annular inner cleaning groove (94) on its inner side for the protruding ball (64) and 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). Side steps (95) are symmetrically arranged on the inner side of the outer cleaning seat (91) and on both sides of the annular inner cleaning groove (94). A drain pipe (96) is provided downwardly at the bottom of the annular inner cleaning groove (94).

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