CN112775736A

CN112775736A - Reducing pipe fitting inner wall grinding device

Info

Publication number: CN112775736A
Application number: CN202110057016.6A
Authority: CN
Inventors: 石海林; 熊亭超; 曹炳鑫; 冯美龙; 石玉宝
Original assignee: Jiujiang Vocational and Technical College
Current assignee: Jiujiang Vocational and Technical College
Priority date: 2021-01-15
Filing date: 2021-01-15
Publication date: 2021-05-11

Abstract

The utility model provides a reducing pipe fitting inner wall grinding device, includes preceding open-ended box, and the bottom inner wall cooperation of box is equipped with two sets of belt conveyor, sets up U type groove in the box, and U type groove comprises first groove, second groove, third groove, and first groove and second groove are parallel to each other, and the third groove is mutually perpendicular with first groove, two electric telescopic handle's back of the body end fixed mounting respectively the piece of polishing, and double-shaft motor's both sides are fixed mounting distance sensor respectively. Can polish different diameter pipe fittings of different diameters, equidimension not through this application to be in the both sides inner wall of same horizontal plane and polish when the distance between the piece is inequality, can also adjust separately, satisfy the needs of polishing, moreover at the in-process of polishing, need not manual operation, raise the efficiency, and also avoided the dark department of different diameter pipe fittings, because of the unable circumstances of polishing that gets into of artifical handheld sander.

Description

Reducing pipe fitting inner wall grinding device

Technical Field

The invention belongs to the technical field of mechanical manufacturing, and particularly relates to a grinding device for an inner wall of a reducing pipe fitting.

Background

The reducing pipe is also called reducer. One of the chemical pipe fittings is used for the connection of two kinds of different pipe diameters's pipe. And is divided into a concentric reducer and an eccentric reducer. With the continuous development of the industrialized society, the demand for the reducing pipe is continuously improved, the processing equipment of the reducing pipe is gradually increased, and at present, no equipment specially used for carrying out internal polishing on the reducing pipe exists, so that a grinding device for the inner wall of the reducing pipe fitting is designed.

Disclosure of Invention

The invention provides a grinding device for the inner wall of a reducing pipe fitting, which is used for overcoming the defects in the prior art.

The invention is realized by the following technical scheme:

a grinding device for inner walls of reducing pipes comprises a box body with an opening in the front, two groups of belt type conveying devices are arranged on the inner wall of the bottom end of the box body in a matched mode, a U-shaped groove is formed in the box body and comprises a first groove, a second groove and a third groove, the first groove is parallel to the second groove, the third groove is perpendicular to the first groove, the opposite ends of the first groove and the second groove and the front end of the third groove are respectively provided with a through groove, a U-shaped rod is arranged in the U-shaped groove in a matched mode, the opposite ends of two longitudinal rods of the U-shaped rod and the front end of a transverse rod are respectively fixedly provided with a connecting block, the connecting blocks are located in the corresponding through grooves, a U-shaped frame is arranged in the box body in a matched mode, the outer wall of the U-shaped frame is fixedly connected with one end of the connecting block, the opposite ends of the two longitudinal rods of the U-shaped frame are respectively fixedly provided with, a vertical screw rod is movably arranged on the inner wall of the bottom end of the third groove, the top end of the screw rod can penetrate through the cavity and is movably connected with the inner wall of the top end of the cavity, a screw nut is arranged on the screw rod in a matched mode, the front end of the screw nut is fixedly connected with the rear end of a transverse rod of the U-shaped rod, a threaded rod with a motor is movably arranged on the inner walls of the front end and the rear end of the cavity and is positioned on one side of the screw rod, a nut is arranged on the threaded rod in a matched mode, a forward and reverse motor is fixedly arranged on one side of the nut, the bottom end of the forward and reverse motor is in contact fit with the inner wall of the bottom end of the cavity, a first bevel gear is fixedly arranged at the end of an output shaft of the forward and reverse motor, a threaded sleeve with two through ends is fixedly arranged on the inner wall of the top end of the box body, a, the second bevel gear is located the cavity, the bottom movable mounting bottom open-ended sleeve of screw rod, telescopic both sides top is fixed mounting limiting rod respectively, the one end of one of them limiting rod inserts to first inslot, the one end of another limiting rod inserts to the second inslot, the rotatory extension device of top cooperation installation in the sleeve, the bottom cooperation installation angle adjusting device of rotatory extension device, angle adjusting device's bottom fixed mounting biax motor, two output shaft tip of biax motor are the first electric telescopic handle of fixed mounting respectively, the back of the body end difference fixed mounting piece of polishing of two first electric telescopic handle, the both sides of biax motor are fixed mounting distance sensor respectively.

According to the grinding device for the inner wall of the reducing pipe fitting, the rotary stretching device is composed of the rotary motor, the disc and the second electric telescopic rod, the rotary motor is installed on the inner wall of the top end of the sleeve, the disc is installed at the bottom end of the output shaft of the rotary motor, the second electric telescopic rod is installed at the bottom end of the disc, and the angle adjusting device is located below the second electric telescopic rod.

As above a reducing pipe fitting inner wall grinding device, angle adjusting device by connecting plate, connecting rod, two third electric telescopic handle are constituteed, the top surface fixed connection of second electric telescopic handle's bottom and connecting plate, the top of connecting rod is connected with the bottom surface of connecting plate is articulated, two third electric telescopic handle are located the both sides of connecting rod respectively, the top of two third electric telescopic handle is connected with the bottom surface of connecting plate is articulated, the bottom of third electric telescopic handle is connected with the lateral part of connecting rod is articulated, the bottom of connecting rod and the top fixed connection of biax motor.

According to the grinding device for the inner wall of the reducing pipe fitting, the front end of the transverse rod of the U-shaped frame is fixedly provided with the second telescopic rod, and the front end of the second telescopic rod is hinged with the second clamping plate.

According to the grinding device for the inner wall of the reducing pipe fitting, the second clamping plate and the first clamping plate are both arc-shaped plates.

The invention has the advantages that: the reducing pipe fittings are conveyed into the box body from a group of belt type conveying devices, at the moment, the U-shaped frame moves to the lower part in the box body, namely, the threaded rod rotates under the driving of the motor, the forward and reverse rotating motor is in contact fit with the inner wall of the bottom end of the cavity body to limit the nut, the forward and reverse rotating motor is driven to move to the rear part in the cavity body, meanwhile, the first bevel gears are meshed and matched with the second bevel gears on the screw rods to drive the screw rods to rotate, further, the U-shaped frame is driven to move up and down, the two first telescopic rods stretch or retract, the reducing pipe fittings are positioned in the middle part, namely, under the sleeve, then the forward and reverse rotating motor rotates reversely to drive the screw rods to rotate, the U-shaped frame drives the reducing pipe fittings to move up, and the bottom end of the sleeve can penetrate through the opening with smaller diameter of the reducing pipe fittings, then the threaded rod rotates reversely to drive the forward and reverse rotating motor to move forward, so that the first bevel gear is meshed with and matched with the second bevel gear on the spring telescopic rod, when in initial polishing, the rotary stretching device in the sleeve pushes the angle adjusting device and the double-shaft motor to move downwards, so that the double-shaft motor moves out of the sleeve, then the distance between the inner wall of the reducing pipe fitting and the polishing piece is detected according to the distance sensor, the first electric telescopic rod is controlled to stretch, so that the polishing piece is contacted with the inner wall of the reducing pipe fitting, and the opposite inner walls of the reducing pipe fitting can be simultaneously polished by the two polishing pieces, when the distances between the inner wall of the reducing pipe fitting and the polishing piece are different, the first electric telescopic rod can be adjusted according to the distance, the polishing requirements of the inner walls of the reducing pipe fittings with different diameters and different shapes are met, and the angle, the grinding device has the advantages that more grinding requirements are met, when the reducing pipe fittings are long, the forward and reverse rotating motor rotates to drive the first bevel gear, the second bevel gear and the spring telescopic rod to rotate, the screw rod is further driven to rotate to move downwards to push the sleeve downwards to enter a deeper position inside the reducing pipe fittings, the double-shaft motor can be driven to rotate through the rotary stretching device, the moving path of the double-shaft motor is further extended, after grinding is finished, the forward and reverse rotating motor moves to the rear side to move the U-shaped frame downwards, then the two first telescopic rods stretch and contract, the reducing pipe fittings after grinding are placed on the other group of belt type conveying devices and conveyed to the next process; can polish different diameter pipe fittings of different diameters, equidimension not through this application, can carry out the both sides inner wall and polish simultaneously moreover to the both sides inner wall that is in same horizontal plane and the distance between the piece of polishing are inequality, can also adjust separately, satisfy the needs of polishing, and at the in-process of polishing, need not manual operation, raise the efficiency, and also avoided the deeper department of different diameter pipe fittings, because of the unable condition of polishing that gets into of artifical handheld sander.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention; FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1; FIG. 3 is a view of B of FIG. 1; FIG. 4 is an enlarged view of a portion I of FIG. 1; fig. 5 is a partial enlarged view of II of fig. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A grinding device for the inner wall of a reducing pipe fitting comprises a box body 1 with an opening in the front, two groups of belt conveying devices are arranged on the inner wall of the bottom end of the box body 1 in a matched mode, the rear ends of the two groups of belt conveying devices are located in the box body 1 and located on two sides in the box body 1 respectively, the reducing pipe fitting is conveyed by one group of belt conveying devices, the other group of belt conveying devices conveys the ground reducing pipe fitting, a U-shaped groove 2 is formed in the box body 1, the U-shaped groove 2 is composed of a first groove 201, a second groove 202 and a third groove 203, the first groove 201 and the second groove 202 are parallel to each other, the third groove 203 and the first groove 201 are perpendicular to each other, the first groove 201 is located in the left side of the box body 1, the second groove 202 is located in the right side of the box body 1, the third groove 203 is located in the rear end of the box body 1, opposite ends of the first groove 201 and the second groove 202 and the front end of the third groove 203 are respectively provided with a through groove 3, two longitudinal rods of the U-shaped rod 4 are respectively positioned in the first groove 201 and the second groove 202, a transverse rod of the U-shaped rod 4 is positioned in the third groove 203, opposite ends of the two longitudinal rods of the U-shaped rod 4 and the front end of the transverse rod are fixedly provided with the connecting block 5, the connecting block 5 is positioned in the corresponding through groove 3, a U-shaped frame 6 is arranged in the box body 1 in a matching way, the outer wall of the U-shaped frame 6 is fixedly connected with one end of the connecting block 5, the left side of the left longitudinal rod of the U-shaped frame 6 is fixedly connected with the right side of the connecting block 5 on the left side, the right side of the right longitudinal rod of the U-shaped frame 6 is fixedly connected with the left side of the connecting block 5 on the right side, the rear end of the transverse rod of the U-shaped frame 6 is fixedly connected with the front end of the connecting block 5 on the rear side, opposite ends of the two longitudinal rods of the U-shaped frame 6 are, a cavity 9 is arranged at the top in the box body 1, a vertical screw rod 10 is movably arranged on the inner wall at the bottom end of the third groove 203, the top end of the screw rod 10 can penetrate through the cavity 9 and is movably connected with the inner wall at the top end of the cavity 9, a screw nut 11 is arranged on the screw rod 10 in a matching way, the front end of the screw nut 11 is fixedly connected with the rear end of a transverse rod of the U-shaped rod 4, a threaded rod 12 with a motor is movably arranged on the inner wall at the front end and the rear end of the cavity 9, the threaded rod 12 is positioned at one side of the screw rod 10, the motor of the threaded rod 12 is arranged on the inner wall at the rear end of the cavity 9, a nut 13 is arranged on the threaded rod 12 in a matching way, a forward and reverse rotating motor 14 is fixedly arranged at one side of the nut 13, the bottom end of the forward and reverse rotating motor 14 is in contact and matching with the inner wall, a spring telescopic rod 18 is fixedly installed at the top end of the screw rod 17, the top end of the spring telescopic rod 18 penetrates through the cavity 9 and is movably connected with the inner wall of the top end of the cavity 9, a second bevel gear 19 is fixedly installed at the top end of the spring telescopic rod 18 respectively at the top end of the screw rod 10, the second bevel gear 19 is positioned in the cavity 9, when the forward and reverse motor 14 is positioned in front, the first bevel gear 15 can be meshed and matched with the second bevel gear 19 on the spring telescopic rod 18, when the forward and reverse motor 14 is positioned in rear, the first bevel gear 15 can be meshed and matched with the second bevel gear 19 on the screw rod 10, a sleeve 20 with an opening at the bottom end is movably installed at the bottom end of the screw rod 17, the minimum opening diameter of the reducing pipe fitting is larger than the diameter of the sleeve 20, limiting rods 21 are fixedly installed at the top ends of two sides of the sleeve 20 respectively, one limiting rod 21 is inserted, rotatory extension device of top cooperation installation in sleeve 20, rotatory extension device's bottom cooperation installation angle adjusting device, angle adjusting device's bottom fixed mounting double-shaft motor 22, two output shaft tip of double-shaft motor 22 are the first electric telescopic handle 23 of fixed mounting respectively, two back of the body end difference fixed mounting of electric telescopic handle 23 are polished 24, double-shaft motor 22's both sides are fixed mounting distance sensor 25 respectively, double-shaft motor 22 gets into the inside back of reducing pipe fitting, detect the distance between reducing pipe fitting inner wall and the piece of polishing 24 through distance sensor 25, then control first electric telescopic handle 23 and extend, make the contact of piece of polishing 24 and reducing pipe fitting inner wall, and polish to it and handle. The reducing pipe fittings are conveyed into the box body 1 from a group of belt type conveying devices, at the moment, the U-shaped frame 6 moves to the lower part in the box body 1, namely, the threaded rod 12 is driven by the motor to rotate, the forward and reverse rotating motor 14 is in contact fit with the inner wall of the bottom end of the cavity 9 to limit the nut 13, the forward and reverse rotating motor 14 is driven to move to the rear part in the cavity 9, meanwhile, the first bevel gear 15 is meshed and matched with the second bevel gear 19 on the screw rod 10 to drive the screw rod 10 to rotate, further, the U-shaped frame 6 is driven to move up and down, the two first telescopic rods 7 are extended or contracted, the reducing pipe fittings are clamped by the two first clamping plates 8, then the two first telescopic rods 7 are extended or contracted to enable the reducing pipe fittings to be positioned in the middle part, namely, under the sleeve 20, then the forward and reverse rotating motor rotates, the screw rod 10 is driven to rotate, and the U-, the bottom end of a sleeve 20 can penetrate through an opening with a smaller diameter of a reducing pipe fitting, then a threaded rod 12 rotates reversely to drive a forward and reverse rotation motor 14 to move forwards, a first bevel gear 15 is meshed and matched with a second bevel gear 19 on a spring telescopic rod 18, during initial polishing, a rotary stretching device in the sleeve 20 pushes an angle adjusting device and a double-shaft motor 22 to move downwards, the double-shaft motor 22 moves out of the sleeve 20, then a distance between the inner wall of the reducing pipe fitting and a polishing piece 24 is detected according to a distance sensor 25, a first electric telescopic rod 23 is controlled to stretch, the polishing piece 24 is contacted with the inner wall of the reducing pipe fitting, relative inner walls of the reducing pipe fitting can be simultaneously polished through the two polishing pieces 24, and when the distance between the inner wall of the reducing pipe fitting and the polishing piece 24 is different, the first electric telescopic rod 28 can be adjusted according to the distance to meet the requirements of telescopic rods with, The grinding requirements of the inner walls of the reducing pipe fittings with different shapes can be met, the angle of the double-shaft motor 22 can be adjusted through the angle adjusting device, more grinding requirements can be met, when the reducing pipe is long, the forward and reverse rotating motor 14 rotates to drive the first bevel gear 15, the second bevel gear 19 and the spring telescopic rod 18 to rotate, further driving the screw 17 to rotate, so that the screw 17 moves downwards, the sleeve 20 is pushed downwards, the sleeve 20 enters a deeper position inside the reducing pipe fitting, and the double-shaft motor 22 can be driven to rotate by rotating the stretching device, and further extends the moving path of the double-shaft motor, after the grinding is finished, the forward and reverse rotating motor 14 moves to the rear, the U-shaped frame 6 moves downwards, then the two first telescopic rods 7 are extended and contracted, and the reducing pipe fittings after being polished are placed on the other group of belt type conveying devices and conveyed to the next procedure; can polish different diameter pipe fittings of different diameters, equidimension not through this application, can carry out the both sides inner wall and polish simultaneously moreover to the both sides inner wall that is in same horizontal plane and the distance between the piece 24 of polishing are inequality, can also adjust separately, satisfy the needs of polishing, and at the in-process of polishing, need not manual operation, raise the efficiency, and also avoided the deeper department of different diameter pipe fittings, because of the unable condition of polishing that gets into of artifical handheld sander.

Specifically, the rotary stretching device according to the present embodiment is composed of a rotary motor 26, a disc 27, and a second electric telescopic rod 28, wherein the rotary motor 26 is installed on the inner wall of the top end of the sleeve 20, the disc 27 is installed at the bottom end of the output shaft of the rotary motor 26, the second electric telescopic rod 28 is installed at the bottom end of the disc 27, and the angle adjusting device is located below the second electric telescopic rod 28. The rotating motor 26 works to drive the disc 27 and the second electric telescopic rod 28 to rotate, the second telescopic rod 28 extends to drive the angle adjusting device to move downwards, and the depth of the double-shaft motor 22 entering the reducing pipe fitting is adjusted according to different polishing requirements.

Specifically, the angle adjusting device described in this embodiment is composed of a connecting plate 29, a connecting rod 30, two third electric telescopic rods 31, the bottom end of the second electric telescopic rod 28 is fixedly connected with the top surface of the connecting plate 29, the top end of the connecting rod 30 is hinged to the bottom surface of the connecting plate 29, the two third electric telescopic rods 31 are respectively located on two sides of the connecting rod 30, the top ends of the two third electric telescopic rods 31 are hinged to the bottom surface of the connecting plate 29, the bottom end of the third electric telescopic rod 31 is hinged to the side portion of the connecting rod 30, and the bottom end of the connecting rod 30 is fixedly connected with the top end of the double-shaft motor. One third electric telescopic rod 31 extends, and the other third electric telescopic rod 31 contracts, so that the connecting rod 30 can be turned over by taking a hinge point with the connecting plate 29 as a center, the lower double-shaft motor 22 is driven to rotate by a certain angle, the adjustment is carried out according to the inner walls of the reducing pipe fittings with different diameters, and the polishing requirements of the reducing pipe fittings with different diameters are met.

Further, the front end of the transverse rod of the U-shaped frame 6 according to this embodiment is fixedly installed with a second telescopic rod 33, and the front end of the second telescopic rod 31 is hinged with a second clamping plate 32. In the polishing process, through the extension of second telescopic link 33, second splint 32 contacts with the back outer wall of reducing pipe fitting, further with reducing pipe fitting centre gripping, increases stability, and the result of use is better.

Furthermore, the second clamping plate 32 and the first clamping plate 8 are both arc-shaped plates in the embodiment. The arc plate is more convenient to clamp the reducing pipe fitting, and the clamping effect is better.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a reducing pipe fitting inner wall grinding device which characterized in that: comprises a box body (1) with an opening in the front, two groups of belt type conveying devices are arranged on the inner wall of the bottom end of the box body (1) in a matched manner, a U-shaped groove (2) is formed in the box body (1), the U-shaped groove (2) is composed of a first groove (201), a second groove (202) and a third groove (203), the first groove (201) and the second groove (202) are parallel to each other, the third groove (203) is perpendicular to the first groove (201), opposite ends of the first groove (201) and the second groove (202) and the front end of the third groove (203) are respectively provided with a through groove (3), a U-shaped rod (4) is arranged in the U-shaped groove (2) in a matched manner, connecting blocks (5) are fixedly installed at the opposite ends of two longitudinal rods of the U-shaped rod (4) and the front end of a transverse rod, the connecting blocks (5) are positioned in the corresponding through grooves (3), a U-shaped frame (6) is arranged in the box body (1) in a matched manner, and, the opposite ends of two longitudinal rods of a U-shaped frame (6) are respectively fixedly provided with a first telescopic rod (7), the opposite ends of the two first telescopic rods (7) are respectively hinged with a first clamping plate (8), the top of the interior of a box body (1) is provided with a cavity (9), the bottom inner wall of a third groove (203) is movably provided with a vertical screw rod (10), the top end of the screw rod (10) can penetrate through the cavity (9) and is movably connected with the top inner wall of the cavity (9), the screw rod (10) is provided with a screw nut (11) in a matching way, the front end of the screw nut (11) is fixedly connected with the rear end of a transverse rod of the U-shaped rod (4), the inner walls of the front end and the rear end of the cavity (9) are movably provided with a threaded rod (12) with a motor, the threaded rod (12) is positioned on one side of the screw rod (10), the threaded rod (12, the bottom end of a forward and reverse rotating motor (14) is in contact fit with the inner wall of the bottom end of a cavity (9), a first bevel gear (15) is fixedly installed at the end part of an output shaft of the forward and reverse rotating motor (14), a threaded sleeve (16) with the upper end and the lower end being through is fixedly installed on the inner wall of the top end of a box body (1), a screw rod (17) is arranged in the threaded sleeve (16) in a matched mode, a spring telescopic rod (18) is fixedly installed at the top end of the screw rod (17), the top end of the spring telescopic rod (18) penetrates through the cavity (9) and is movably connected with the inner wall of the top end of the cavity (9), a second bevel gear (19) is respectively and fixedly installed at the top end of a screw rod (10) and the top end of the spring telescopic rod (18), the second bevel gear (19) is located in the cavity (9), a sleeve (20) with an opening at the bottom end is movably installed at the bottom end of the screw, one end of another limiting rod (21) is inserted into the second groove (202), the top end is installed in a matched mode in the sleeve (20) and is rotated and extended, the bottom end of the rotated and extended device is installed with the angle adjusting device in a matched mode, the bottom end of the angle adjusting device is fixedly provided with the double-shaft motor (22), the end portions of two output shafts of the double-shaft motor (22) are fixedly provided with the first electric telescopic rods (23) respectively, the back of the body ends of the two first electric telescopic rods (23) are fixedly provided with the polishing pieces (24) respectively, and the two sides of the double-shaft motor (22) are fixedly provided with the distance sensors (25.

2. The grinding device for the inner wall of the reducing pipe fitting according to claim 1, wherein: the rotary stretching device is composed of a rotary motor (26), a disc (27) and a second electric telescopic rod (28), the rotary motor (26) is installed on the inner wall of the top end of the sleeve (20), the disc (27) is installed at the bottom end of an output shaft of the rotary motor (26), the second electric telescopic rod (28) is installed at the bottom end of the disc (27), and the angle adjusting device is located below the second electric telescopic rod (28).

3. The grinding device for the inner wall of the reducing pipe fitting according to claim 2, wherein: angle adjusting device by connecting plate (29), connecting rod (30), two third electric telescopic handle (31) are constituteed, the bottom of second electric telescopic handle (28) and the top surface fixed connection of connecting plate (29), the top of connecting rod (30) is connected with the bottom surface of connecting plate (29) is articulated, two third electric telescopic handle (31) are located the both sides of connecting rod (30) respectively, the top of two third electric telescopic handle (31) is connected with the bottom surface of connecting plate (29) is articulated, the bottom of third electric telescopic handle (31) is connected with the lateral part of connecting rod (30) is articulated, the bottom of connecting rod (30) and the top fixed connection of biax motor (22).

4. The grinding device for the inner wall of the reducing pipe fitting according to claim 1, wherein: the front end of a transverse rod of the U-shaped frame (6) is fixedly provided with a second telescopic rod (33), and the front end of the second telescopic rod (31) is hinged with a second clamping plate (32).

5. The grinding device for the inner wall of the reducing pipe fitting according to claim 4, wherein: the second clamping plate (32) and the first clamping plate (8) are both arc-shaped plates.