CN215789203U

CN215789203U - Large shot blasting machine for polishing steel pipes

Info

Publication number: CN215789203U
Application number: CN202121279627.7U
Authority: CN
Inventors: 葛强
Original assignee: Yunnan Yucheng Hangxiao Steel Structure Co ltd
Current assignee: Yunnan Yucheng Hangxiao Steel Structure Co ltd
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2022-02-11
Anticipated expiration: 2031-06-09

Abstract

The utility model discloses a large shot blasting machine for polishing steel pipes, which comprises a shell, wherein an impeller head penetrates through the upper part of the shell, a motor is fixedly installed on one side of the impeller head, a transmission shaft is clamped and installed at one end of the motor, six groups of partition plates are fixedly installed on the side wall of the transmission shaft, a discharge hole is formed in the inner bottom surface of the impeller head, two groups of guide plates are fixedly installed on the inner top surface of the shell, a plurality of groups of rolling rollers penetrate through the two sides of the inner part of the shell, steel pipes are installed on the upper parts of the plurality of groups of rolling rollers, an automatic rotating screw rod is installed inside the steel pipes, and a buffer sponge is installed on the inner bottom surface of the shell. Has the advantages that: the automatic rotating screw is adopted, and the steel pipe can be automatically rotated by the automatic rotating screw without adding an electric rotating mechanism, so that the large shot blasting machine for polishing the steel pipe accords with the green environmental protection development concept.

Description

Large shot blasting machine for polishing steel pipes

Technical Field

The utility model relates to the technical field of steel pipe polishing, in particular to a large shot blasting machine for polishing steel pipes.

Background

The shot blasting machine is mechanical equipment for cleaning or strengthening the surface of a workpiece by utilizing high-speed shots thrown by the shot blasting machine, is quicker and more effective compared with other surface treatment technologies, can be widely applied to the production and manufacturing fields of parts such as aviation, aerospace industry, automobiles, tractors and the like in the casting process after partial retention or stamping, polishes the surface of a steel pipe, is mostly used for polishing the steel pipe, and has the advantages of good polishing efficiency, stable polishing, safe use and the like in practical use.

However, current large-scale shot-blasting machine that is used for the steel pipe to polish usefulness, it is comprehensive to polish for the guarantee steel pipe surface, a set of electric power rotary mechanism is connected with the steel pipe now more, guarantee that the steel pipe surface is whole to collide with the shot, this kind of structure can increase the use cost who is used for the large-scale shot-blasting machine that the steel pipe polished usefulness, can consume a large amount of electric power resources simultaneously, be not conform to green development theory, secondly, the shot that falls receives the action of gravity and collides with the inside bottom surface of shell, when using for a long time, can make the inside bottom surface of shell form unevenness's shape, the shell is difficult to restore for metallic structure, reduce the life who is used for the large-scale shot-blasting machine that the steel pipe polished usefulness.

An effective solution to the problems in the related art has not been proposed yet.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Aiming at the defects of the prior art, the utility model provides a large shot blasting machine for polishing a steel pipe, which has the advantages of automatically rotating the steel pipe without adding an electric rotating mechanism, buffering the falling speed of a shot and protecting the inner bottom surface of a shell, thereby solving the problems in the background art.

(II) technical scheme

In order to realize the advantages that the steel pipe can be automatically rotated without adding an electric rotating mechanism, the falling speed of the shot can be buffered, and the inner bottom surface of the shell is protected, the utility model adopts the following specific technical scheme:

a large shot blasting machine for polishing steel pipes comprises a shell, wherein an impeller head is installed on the upper portion of the shell in a penetrating mode, a motor is fixedly installed on one side of the impeller head, a transmission shaft is installed at one end of the motor in a clamped mode, six groups of partition plates are fixedly installed on the side wall of the transmission shaft, a discharge port is formed in the inner bottom surface of the impeller head, two groups of guide plates are fixedly installed on the inner top surface of the shell, a plurality of groups of rolling rollers are installed on the two sides of the inner portion of the shell in a penetrating mode, a plurality of groups of steel pipes are placed and installed on the upper portions of the rolling rollers, automatic rotating screw rods are installed inside the steel pipes, buffering sponges are installed on the inner bottom surface of the shell, transverse arc plates are fixedly installed on the two sides of the inner portion of the shell, a discharge pipe is fixedly installed on the lower portion of the shell in a penetrating mode, a sand pumping pump is installed on one end of the discharge pipe in a clamped mode, and a guide pipe is installed on one end of the sand pumping pump in a clamped mode, one end of the material guide pipe penetrates through the other side of the shot blasting device, two sets of primary and secondary hinges are fixedly mounted on the end face of the shell, a cabinet door is fixedly mounted at one end of each primary and secondary hinge, and a handle is mounted on the end face of the cabinet door.

Further, the lateral wall of autogiration screw rod cup joints and installs socket pipe and nut, the outside lateral wall of socket pipe cup joints and installs the bearing, and the outside lateral wall fixed mounting of bearing has two sets of T templates, and is two sets of the spacing end lateral wall of T template all is provided with the screw thread and has passed through L, and is two sets of the inside of screw thread through-hole all runs through and installs the bolt, the inside rear end of shell is provided with built-in T type spout, the one end tip fixed mounting of autogiration screw rod has the plectane, and the plectane is located the inside of built-in T type spout, and is two sets of the equal fixed mounting in rear end of T template has the stay cord, and is two sets of the equal fixed mounting in one end tip of stay cord has the baffle, and two sets of the equal fixed mounting in upper portion of baffle has the rubber swash plate.

Furthermore, the two groups of thread through holes are meshed with the two groups of bolts, and the automatic rotating screw rod is meshed with the nut.

Further, the length of the two groups of baffles is the same as the length of the interior of the shell.

Further, the bell jar has been seted up on the upper portion of buffering sponge, and the inside bottom surface of bell jar has seted up fixing hole, the other end tip of discharging pipe is located fixing hole's inside, the foam double faced adhesive tape is installed in pasting of the lower part of buffering sponge, and the lower part of foam double faced adhesive tape pastes and installs the mounting hole board, the inside bottom surface of shell is provided with two sets of through holes, and two sets of the connecting rod is all run through to install in the inside of through hole, and two sets of the one end tip of connecting rod and the lower part fixed connection of mounting hole board, it is two sets of the other end tip fixed mounting of connecting rod has the lifting plate.

Further, a control panel is installed on one side of the shell and is electrically connected with the motor and the sand pump through an electric wire.

Furthermore, four groups of supporting columns are installed on the lower portion of the shell, and universal wheels are fixedly installed at the end portions of one ends of the four groups of supporting columns.

(III) advantageous effects

Compared with the prior art, the utility model provides a large shot blasting machine for polishing steel pipes, which has the following beneficial effects:

(1) the utility model adopts the automatic rotating screw, when the steel pipe needs to be installed, an operator firstly places the steel pipe on the upper parts of a plurality of groups of rolling rollers by hand, then utilizes the circular plate and the built-in T-shaped chute to move the circular plate up and down to drive the automatic rotating screw to do synchronous motion, when the automatic rotating screw moves to a desired position, the steel pipe is moved to ensure that the automatic rotating screw is inserted into the steel pipe, the operator firstly utilizes the automatic rotating screw to be mutually meshed with the nut, the nut is rotated clockwise to prop against the sleeve pipe to move backwards, when one end of the sleeve pipe is tightly contacted with the inner rear end of the shell, the operator utilizes the two groups of thread through holes to be mutually meshed with the two groups of bolts, the two groups of bolts are rotated clockwise, when the end parts of the two groups of bolts are respectively tightly contacted with the inner side wall of the steel pipe, the control panel can be utilized to ensure that the output end part of the motor rotates, the six groups of isolation plates are driven to do synchronous rotation through the transmission shaft, the promotion of pellet through six groups division board is derived through the discharge gate, with the surface collision contact of steel pipe, finally run through the upper portion that a plurality of groups roll the roller and fall two sets of rubber swash plates, the pellet that falls when the upper portion of left side rubber swash plate is more when, through dragging the left side stay cord, utilize the bearing, drive two sets of T templates, autogiration screw rod and steel pipe clockwise rotation, the pellet that falls when the upper portion of right side rubber swash plate is more when, through dragging the right side stay cord, utilize the bearing, drive two sets of T templates, autogiration screw rod and steel pipe anticlockwise rotation, the pellet can be comprehensive with the surface contact of steel pipe, autogiration screw rod through setting up, need not to add electric power rotary mechanism, just can autogiration steel pipe, use the large-scale shot-blasting machine of steel pipe polishing usefulness accords with green development theory.

(2) The utility model adopts the buffering sponge, when the projectile falls off the upper part of the buffering sponge, the projectile slides along the side wall of the conical groove and enters the discharging pipe through the fixing through hole, because the buffering sponge is soft in texture, the falling projectile can be buffered and prevented from directly contacting with the inner bottom surface of the shell, when the buffering sponge needs to be replaced, an operator moves up the lifting plate by hand, the buffering sponge is moved up by using two groups of connecting rods and the mounting hole plate, when the buffering sponge moves to the opening of the end surface of the shell, the buffering sponge can be replaced, the buffering sponge is fixed by replacing new foam double-sided adhesive tape, after the replacement is finished, the operator loosens the lifting plate, the new buffering sponge vertically moves downwards under the action of gravity, when the lower part of the mounting hole plate contacts with the inner bottom surface of the shell, the replacement of the buffering sponge is completed, and the buffering sponge passes through the arranged buffering sponge, the falling speed of the shot can be buffered, the inner bottom surface of the shell is protected, and the service life of the large shot blasting machine for polishing the steel pipe is prolonged.

Drawings

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

FIG. 1 is a schematic structural diagram of a large shot blasting machine for polishing steel pipes, which is provided by the utility model;

FIG. 2 is a front view of a large shot blasting machine for steel pipe grinding according to the present invention;

FIG. 3 is a perspective view of the self-rotating screw of the present invention;

FIG. 4 is a schematic cross-sectional view of a shot blast apparatus of the present invention;

FIG. 5 is an enlarged view of A of FIG. 1 in accordance with the present invention;

fig. 6 is an enlarged view of B of fig. 1 according to the present invention.

In the figure:

1. a housing; 2. a shot blasting machine; 3. a motor; 4. a drive shaft; 5. a separator plate; 6. a discharge port; 7. a guide plate; 8. a rolling roller; 9. a buffer sponge; 10. a steel pipe; 11. automatically rotating the screw; 12. a discharge pipe; 13. a sand pump; 14. a material guide pipe; 15. sleeving a pipe; 16. a bearing; 17. a T-shaped plate; 18. a threaded through hole; 19. a bolt; 20. a nut; 21. a circular plate; 22. a T-shaped chute is arranged in the box body; 23. pulling a rope; 24. a baffle plate; 25. a rubber sloping plate; 26. a transverse arc plate; 27. a tapered groove; 28. a fixing through hole; 29. foaming double-sided adhesive tape; 30. installing a pore plate; 3l, through holes; 32. a connecting rod; 33. a lifting plate; 34. a primary and secondary hinge; 35. a cabinet door; 36. a handle.

Detailed Description

For further explanation of the various embodiments, the drawings which form a part of the disclosure and which are incorporated in and constitute a part of this specification, illustrate embodiments and, together with the description, serve to explain the principles of operation of the embodiments, and to enable others of ordinary skill in the art to understand the various embodiments and advantages of the utility model, and, by reference to these figures, reference is made to the accompanying drawings, which are not to scale and wherein like reference numerals generally refer to like elements.

According to the embodiment of the utility model, the large shot blasting machine for polishing the steel pipe is provided.

The utility model will be further described with reference to the accompanying drawings and specific embodiments, as shown in fig. 1-6, a large shot blasting machine for steel pipe polishing according to an embodiment of the utility model comprises a housing 1, wherein a shot blasting machine 2 is installed on the upper portion of the housing 1 in a penetrating manner, a motor 3 is fixedly installed on one side of the shot blasting machine 2, a transmission shaft 4 is installed at one end of the motor 3 in a clamping manner, six groups of isolation plates 5 are fixedly installed on the side wall of the transmission shaft 4, a discharge port 6 is arranged on the inner bottom surface of the shot blasting machine 2, two groups of guide plates 7 are fixedly installed on the inner top surface of the housing 1, a plurality of groups of rolling rollers 8 are installed on two sides of the interior of the housing 1 in a penetrating manner, a steel pipe 10 is installed on the upper portion of the plurality of rolling rollers 8, an automatic rotating screw 11 is installed inside the steel pipe 10, a buffer sponge 9 is installed on the inner bottom surface of the housing 1, and transverse arc-shaped plates 26 are fixedly installed on two sides of the interior of the housing 1, the fixed lower part of shell 1 runs through and installs discharging pipe 12, and the one end joint of discharging pipe 12 installs and takes out husky pump 13, and take out husky pump 13's one end joint and install passage 14, the one end of passage 14 runs through the opposite side of impeller head 2, the terminal surface fixed mounting of shell 1 has two sets of primary and secondary hinges 34, and the one end fixed mounting of two sets of primary and secondary hinges 34 has cabinet door 35, and handle 36 is installed to the terminal surface of cabinet door 35, impeller head 2, motor 3 and take out husky pump 13 and be current structure, do not do too much repetitious description here.

In one embodiment, a sleeve 15 and a nut 20 are sleeved on the side wall of an automatic rotating screw l1, a bearing 16 is sleeved on the outer side wall of the sleeve 15, two sets of T-shaped plates 17 are fixedly installed on the outer side wall of the bearing 16, threaded through holes 18 are formed in the side walls of the limiting ends of the two sets of T-shaped plates 17, bolts 19 are installed inside the two sets of threaded through holes 18 in a penetrating manner, a built-in T-shaped chute 22 is arranged at the rear end inside the housing 1, a circular plate 21 is fixedly installed at one end of the automatic rotating screw 11, the circular plate 21 is located inside the built-in T-shaped chute 22, pull ropes 23 are fixedly installed at the rear ends of the two sets of T-shaped plates 17, a baffle 24 is fixedly installed at one end of the two sets of pull ropes 23, a rubber inclined plate 25 is fixedly installed at the upper part of the two sets of baffle 24, when the steel pipe 10 needs to be installed, an operator firstly places the steel pipe 10 on the upper parts of the sets of rolling rollers 8 by hand, then, the circular plate 21 and the built-in T-shaped chute 22 are utilized to move the circular plate 2l up and down to drive the automatic rotating screw 11 to do synchronous motion, when the automatic rotating screw 11 moves to a desired position, the steel pipe 10 is moved to enable the automatic rotating screw ll to be inserted into the steel pipe 10, an operator firstly utilizes the automatic rotating screw 11 to be meshed with the nut 20, rotates the nut 20 clockwise to abut against the sleeve pipe 15 and then moves backwards, when one end of the sleeve pipe 15 is tightly contacted with the inner rear end of the shell 1, the operator utilizes the two groups of threaded through holes 18 to be meshed with the two groups of bolts 19, rotates the two groups of bolts 19 clockwise, when the end parts of the two groups of bolts 19 are respectively tightly contacted with the inner side wall of the steel pipe 10, the output end of the motor 3 can be rotated by utilizing the control panel, the six groups of isolation plates 5 are driven to synchronously rotate by the transmission shaft 4, and the shot is led out through the discharge port 6 by the pushing of the six groups of isolation plates 5, with the surface collision contact of steel pipe 10, finally run through the upper portion that a plurality of groups of roll rollers 8 fell two sets of rubber swash plates 25, when the shot that the upper portion of left side rubber swash plate 25 fell was more, through dragging left side stay cord 23, utilize bearing 16, drive two sets of T template 17, autogiration screw rod 11 and steel pipe 10 clockwise rotation, when the shot that the upper portion of right side rubber swash plate 25 fell was more, through dragging right side stay cord 23, utilize bearing 16, drive two sets of T template 17, autogiration screw rod 11 and steel pipe 10 anticlockwise rotation, the shot can be comprehensive with the surface contact of steel pipe 10, autogiration screw rod 11 through setting up, need not to add electric rotary mechanism, just can autogiration steel pipe 10, make the large-scale shot-blasting machine of steel pipe polishing usefulness accord with green development theory.

In one embodiment, the two sets of threaded through holes 18 are engaged with the two sets of bolts 19, and the self-rotating threaded rod 11 is engaged with the nut 20, so that the positions of the two sets of bolts 19 and nuts 20 can be adjusted.

In one embodiment, the length of the two sets of baffles 24 is the same as the internal length of the housing 1, so as to avoid that the two sets of baffles 24 cannot be vertically moved up and down due to the overlarge internal length of the housing 1.

In one embodiment, the upper portion of the buffering sponge 9 is provided with a tapered groove 27, the inner bottom surface of the tapered groove 27 is provided with a fixing through hole 28, the other end of the discharging pipe 12 is positioned inside the fixing through hole 28, the lower portion of the buffering sponge 9 is adhered with a foam double-sided adhesive tape 29, the lower portion of the foam double-sided adhesive tape 29 is adhered with a mounting hole plate 30, the inner bottom surface of the housing 1 is provided with two groups of through holes 31, the two groups of through holes 3l are both internally and penetratingly provided with connecting rods 32, one end portions of the two groups of connecting rods 32 are fixedly connected with the lower portion of the mounting hole plate 30, the other end portions of the two groups of connecting rods 32 are fixedly provided with a lifting plate 33, when the projectile falls on the upper portion of the buffering sponge 9, the projectile slides along the side wall of the tapered groove 27 and enters the discharging pipe 12 through the fixing through hole 28, and the buffering sponge 9 is soft in texture and can buffer the falling projectile, prevent its inside bottom surface direct contact with shell 1, when needs are changed buffering sponge 9, the operation workman moves up lifting plate 33 with the hand, utilize two sets of connecting rods 32 and installation orifice plate 30, make buffering sponge 9 move up, when buffering sponge 9 moves shell 1 terminal surface opening part, can change buffering sponge 9, foam double faced adhesive tape 29 that the renewal is new fixes buffering sponge 9, after the renewal finishes, the operation workman loosens lifting plate 33, receive the new buffering sponge 9 of action of gravity and move down perpendicularly, when the lower part of installation orifice plate 30 contacts with the inside bottom surface of shell l, accomplish the change of buffering sponge 9, through the buffering sponge 9 that sets up, can cushion the falling speed of shot, protect the inside bottom surface of shell l, the life of the large-scale shot-blasting machine that is used for the steel pipe to polish the usefulness has been improved.

In one embodiment, a control panel is installed on one side of the housing l, and the control panel is electrically connected with the motor 3 and the sand pump 13 through an electric wire, the control panel plays a role in controlling the motor 3 and the sand pump 13 to work, the control panel can be realized through simple programming by a person skilled in the art, the control panel belongs to common general knowledge in the art, and the control panel is only used without modification, so that the control mode and the circuit connection are not described in detail.

In one embodiment, four groups of support columns are installed on the lower portion of the shell 1, universal wheels are fixedly installed at the end portions of one ends of the four groups of support columns, and the four groups of universal wheels are convenient to move and use for a large shot blasting machine for steel pipe polishing.

The working principle is as follows:

when the automatic rotating screw 11 moves to a desired position, the steel pipe 10 is moved to enable the automatic rotating screw 11 to be inserted into the steel pipe 10, the operator firstly uses the automatic rotating screw 11 to be meshed with the nut 20 and rotates the nut 20 clockwise to abut against the sleeve pipe 15 and then moves backwards, when one end of the sleeve pipe 15 is in close contact with the rear end of the interior of the shell 1, the operator then uses the two groups of thread through holes 18 to be meshed with the two groups of bolts 19, clockwise rotation two sets of bolts 19, when the tip of two sets of bolts 19 respectively with the inside lateral wall in close contact with of steel pipe 10, usable control panel, make the output of motor 3 rotatory, drive six sets of division board 5 through transmission shaft 4 and do synchronous revolution, the pellet is derived through discharge gate 6 through the promotion way of six sets of division board 5, collide with the surface of steel pipe 10 and contact, finally run through a plurality of groups of roller 8 and fall the upper portion of two sets of rubber swash plates 25, when the pellet that falls in the upper portion of left side rubber swash plate 25 is more, through dragging left side stay cord 23, utilize bearing 16, drive two sets of T template 17, autogiration screw rod 11 and steel pipe 10 rotate clockwise, when the pellet that falls in the upper portion of right side rubber swash plate 25 is more, through dragging right side stay cord 23, utilize bearing 16, drive two sets of T template 17, autogiration screw rod 11 and steel pipe 10 rotate anticlockwise, the shot can contact with the surface of the steel pipe 10 comprehensively, the steel pipe 10 can be automatically rotated without adding an electric rotating mechanism through the arranged automatic rotating screw rod 11, the large-scale shot blasting machine for polishing the steel pipe accords with the green environmental protection development idea, meanwhile, when the shot falls on the upper part of the buffering sponge 9, the shot slides along the side wall of the tapered groove 27 and enters the discharging pipe 12 through the fixing through hole 28, the falling shot can be buffered due to the soft texture of the buffering sponge 9 to prevent the falling shot from directly contacting with the inner bottom surface of the shell 1, when the buffering sponge 9 needs to be replaced, an operator moves the lifting plate 33 up by hand, the buffering sponge 9 is moved upwards by utilizing the two groups of connecting rods 32 and the mounting hole plate 30, when the buffering sponge 9 moves to the opening part of the end surface of the shell 1, the buffering sponge 9 can be replaced, the replaced by the new foam double-sided adhesive 29 fixes the buffering sponge 9, after the replacement is finished, the operation worker loosens the lifting plate 33, the buffering sponge 9 which is new under the action of gravity vertically moves downwards, when the lower part of the mounting hole plate 30 is contacted with the inner bottom surface of the shell 1, the replacement of the buffering sponge 9 is completed, the falling speed of the shot can be buffered through the buffering sponge 9 which is arranged, the inner bottom surface of the shell l is protected, and the service life of the large shot blasting machine for polishing the steel pipe is prolonged.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The large shot blasting machine for polishing the steel pipes is characterized by comprising a shell (1), wherein the upper portion of the shell (1) is provided with a shot blasting machine (2) in a penetrating mode, a motor (3) is fixedly arranged on one side of the shot blasting machine (2), a transmission shaft (4) is installed at one end of the motor (3) in a clamping mode, six groups of partition plates (5) are fixedly installed on the side wall of the transmission shaft (4), a discharge port (6) is formed in the inner bottom surface of the shot blasting machine (2), two groups of guide plates (7) are fixedly installed on the inner top surface of the shell (1), a plurality of groups of rolling rollers (8) are installed on the two sides of the inner portion of the shell (1) in a penetrating mode, a steel pipe (10) is installed on the upper portion of each rolling roller (8), an automatic rotating screw rod (11) is installed inside the steel pipe (10), and a sponge buffer (9) is installed on the inner bottom surface of the shell (1), the equal fixed mounting in inside both sides of shell (1) has horizontal arc (26), the fixed lower part of shell (1) is run through and is installed discharging pipe (12), and the one end joint of discharging pipe (12) installs and takes out husky pump (13) to take out the one end joint of husky pump (13) and install passage (14), the opposite side of impeller head (2) is run through to the one end of passage (14), the terminal surface fixed mounting of shell (1) has two sets of primary and secondary hinges (34), and two sets of the one end fixed mounting of primary and secondary hinge (34) has cabinet door (35) to handle (36) are installed to the terminal surface of cabinet door (35).

2. The large shot blasting machine for polishing the steel pipes according to claim 1, wherein a sleeve pipe (15) and a nut (20) are sleeved on the side wall of the automatic rotating screw (11), a bearing (16) is sleeved on the outer side wall of the sleeve pipe (15), two sets of T-shaped plates (17) are fixedly mounted on the outer side wall of the bearing (16), threaded through holes (18) are formed in the side walls of the limiting ends of the two sets of T-shaped plates (17), bolts (19) are installed in the two sets of threaded through holes (18) in a penetrating manner, a built-in T-shaped sliding groove (22) is formed in the rear end of the inner portion of the shell (1), a circular plate (21) is fixedly mounted at the end portion of one end of the automatic rotating screw (11), the circular plate (21) is located in the built-in T-shaped sliding groove (22), and a pull rope (23) is fixedly mounted at the rear end of the two sets of T-shaped plates (17), and one end parts of the two groups of pulling ropes (23) are fixedly provided with baffle plates (24), and the upper parts of the two groups of baffle plates (24) are fixedly provided with rubber inclined plates (25).

3. A large-sized blasting machine for steel pipe grinding according to claim 2, characterized in that two sets of said threaded through holes (18) are engaged with two sets of said bolts (19), and said automatic rotating screw (11) is engaged with a nut (20).

4. A large-sized blasting machine for grinding steel pipes according to claim 2, characterized in that the length of the two sets of baffles (24) is the same as the internal length of the casing (1).

5. The large shot blasting machine for polishing the steel pipes as claimed in claim 1, wherein the upper part of the buffer sponge (9) is provided with a tapered groove (27), and the inner bottom surface of the conical groove (27) is provided with a fixed through hole (28), the end part of the other end of the discharge pipe (12) is positioned in the fixed through hole (28), the lower part of the buffer sponge (9) is stuck with a foam double-sided adhesive tape (29), and the lower part of the foam double-sided adhesive tape (29) is stuck with an installation pore plate (30), the inner bottom surface of the shell (1) is provided with two groups of through holes (31), and the inner parts of the two groups of through holes (31) are respectively provided with a connecting rod (32) in a penetrating way, and one end parts of the two groups of connecting rods (32) are fixedly connected with the lower part of the mounting hole plate (30), and the other end parts of the two groups of connecting rods (32) are fixedly provided with lifting plates (33).

6. The large shot blasting machine for polishing the steel pipes as claimed in claim 1, wherein a control panel is installed on one side of the shell (1), and the control panel is electrically connected with the motor (3) and the sand pump (13) through wires.

7. The large shot blasting machine for polishing the steel pipes as claimed in claim 1, wherein four groups of support columns are mounted at the lower part of the shell (1), and universal wheels are fixedly mounted at the end parts of one ends of the four groups of support columns.