CN116550417B - Scrap steel crushing device with adjustable crushing particle size and its working method - Google Patents

Abstract

The invention relates to the technical field of waste steel crushing, in particular to a waste steel crushing device with adjustable crushing granularity and a working method thereof, which are used for solving the problems that the prior equipment cannot successfully grab and crush arc-shaped steel pipes and cannot carry out split-flow interval blanking on materials to be crushed so as to easily cause material accumulation; compared with the prior art, the invention can pre-extrude the arc-shaped steel pipe so as to facilitate crushing, and simultaneously can separate flow and discharge the steel pipe, thereby effectively avoiding the problem of material accumulation.

Description

Scrap steel crushing device with adjustable crushing particle size and its working method

Technical field

The present invention relates to the technical field of scrap steel crushing, specifically a scrap steel crushing device with adjustable crushing particle size and a working method thereof.

Background technique

Scrap steel refers to various mechanical equipment, transportation vehicles, agricultural machinery, machinery, building materials, military supplies, daily necessities and other scrap products made of steel materials after a certain period of use; or is produced in the production of these products scraps, scraps and iron-containing waste; in addition, obsolete products that have been replaced due to technological progress and backward economic indicators.

During the actual operation of the existing metal grinders used for crushing scrap metal, the materials to be crushed in the crushing area cannot be divided and discharged at intervals. As a result, the scrap metal entering the metal crusher is affected by the efficiency of the crusher. Material accumulation is formed inside and is affected by the shape of the scrap metal, such as hollow spheres, hollow cylinders and other scrap metals with arc-shaped edges. Scrap metal with similar shapes will cause the crushing claws to be unable to successfully grasp and crush them, leading to Scrap metal always rolls above the crushing claws and forms a blockage, which affects the normal cutting of scrap metal and also affects the crushing efficiency of the metal crusher for scrap steel.

In view of the above technical defects, a solution is proposed.

Contents of the invention

The object of the present invention is to provide a scrap steel crushing device with adjustable crushing particle size and a working method thereof, so as to solve the problems mentioned in the above background technology.

In order to achieve the above objects, the present invention provides the following technical solutions:

The scrap steel crushing device with adjustable crushing granularity includes a load-bearing platform 1. The top of the load-bearing platform 1 is fixedly equipped with an inclined surface table 1 and an inclined surface platform 2. One side of the load-bearing material platform 1 is provided with a load-bearing material platform 2. , a crushing box is provided below the second loading platform, and a feeding assembly is provided on the top of the inclined platform one;

The feeding assembly includes an arc-shaped material receiving plate 1, an arc-shaped material receiving plate 2 and a bracket. The bracket is fixedly connected to the side of the inclined table 1. One end of the arc-shaped material receiving plate 1 is rotatably connected in the bracket, so One end of the arc-shaped material receiving plate 2 is rotatably connected to the arc-shaped material receiving plate 1. A torsion spring is provided at the rotary connection between the arc-shaped material receiving plate 1 and the arc-shaped material receiving plate 2. The arc-shaped material receiving plate The bottom of the two is fixed with a limit block through spot welding.

Further, a guide slide rail is fixedly connected to the bottom of the arc-shaped material receiving plate, a guide groove is provided inside the guide slide rail, a driving block is slidably connected to the guide groove inside, and the material loading platform 1 is fixedly connected. There is a mounting slot at the top, and a hydraulic push rod is fixedly installed in the mounting slot. The output end of the hydraulic push rod is movably connected to the driving block, and the top of the load-bearing platform is fixedly connected to a baffle.

Further, a support base is fixedly connected to the top of the load-bearing platform one, a transverse platform is fixedly installed on the top of the support base, and a hydraulic push rod two is fixedly connected to the bottom of the transverse platform. The hydraulic push rod two The bottom end is fixed with a pressure plate through spot welding. The top of the material-carrying platform is provided with an arc-shaped groove. The side of the material-carrying platform is fixed with a supporting plate. The top of the supporting plate is equipped with an electric push rod. , the output end of the electric push rod one is fixedly connected with a push plate.

Furthermore, a rotating base is provided below the second material-carrying platform. Both ends of the second material-carrying platform are rotatably connected to the inside of the rotating seat. A wheel for driving the second material-carrying platform to rotate is provided on the outside of the rotating seat. Motor 1, the top of the material-carrying platform 2 is provided with a buffer component, the buffer component includes a chute, a rectangular limit groove and an arc-shaped limit groove, the top of the material-carrying platform 2 is symmetrically provided with a chute, so The side wall of the chute is provided with a rectangular limit groove and an arc-shaped limit groove, and the rectangular limit groove is connected with the arc-shaped limit groove.

Further, an electric push rod 2 is fixedly installed on the inner wall of the chute, and abutment blocks 1 and 2 are slidingly connected in the chute. The output end of the electric push rod 2 is fixedly connected to the abutment block 1. , the two abutting blocks are rotationally connected to the abutting block one, the top of the abutting block two is fixedly connected with a stopper, and the two sides of the abutting block one and the two abutting blocks are fixedly connected with convex blocks, And the bumps are slidingly connected in the rectangular limiting groove and the arc-shaped limiting groove.

Further, two crushing rollers are rotatably connected inside the crushing box. A spur gear is fixedly connected to the crushing roller on the outside of the crushing box. The two spur gears are meshed and connected. The crushing A motor 2 for driving the crushing roller 1 is provided on the outside of the box. A particle size adjustment assembly is provided inside the crushing box. The particle size adjustment assembly includes two electric push rods 3 and two frames. The two electric push rods 3 are both Fixedly connected to the inner wall of the crushing box, the side of the frame is fixedly connected to the output end of the electric push rod three, the inner wall of the crushing box is symmetrically fixed with a guide frame, and the two ends of the frame are respectively slidingly connected to the corresponding guides. inside the rack.

Further, a crushing roller two is provided in the frame, a motor three for driving the crushing roller two is provided on the outside of the frame, and a protective cover is fixedly installed on the top of the crushing box.

The invention also proposes a working method of a scrap steel crushing device with adjustable crushing particle size, which includes the following steps:

Step 1: First, place the scrap steel pipe on the top of the loading platform one. The hydraulic push rod one drives the arc-shaped material receiving plate one to deflect through the cooperation of the driving block and the guide slide rail. The arc-shaped material receiving plate two is at the limit position. The cooperation between the block and the arc-shaped material receiving plate 1 drives the steel pipe carried on the top to move upward until the arc-shaped material receiving plate 1 and the arc-shaped material receiving plate 2 cooperate with each other to push the steel pipe through the inclined table 1 to a position close to the baffle. , the bottom of the steel pipe stays at the top of the arc-shaped groove under the action of the baffle, and the arc-shaped groove that matches the steel pipe is provided to avoid the problem of the steel pipe slipping during the process of being extruded;

Step 2: The hydraulic push rod 2 pushes the pressure plate to move downward until the pressure plate squeezes the steel pipe into a flat shape. By squeezing the steel pipe into a flat shape, the crushing roller 1 is unable to effectively grasp the arc-shaped steel pipe and crush it effectively. Then the electric push rod 1 pushes the flat steel pipe to the top of the material loading platform 2 through the push plate, and then the motor 1 drives the material loading platform 2 to deflect until it deflects to an angle that is convenient for unloading, and then starts the electric push rod 2 , the electric push rod 2 pushes the abutting block 1 and the abutting block 2 to move until the abutting block 2 slides into the arc-shaped limit groove, and at the same time, the top of the stopper is lower than the upper surface of the load-bearing platform 2, thereby making the flat The steel pipe is slowly transported to between two crushing rollers for crushing:

Step 3: Two crushing rollers crush a pair of flat steel pipes. At the same time, in order to achieve different crushing granularities for scrap steel pipes, the electric push rod three pushes the crushing rollers two closer to each other through the frame, and changes the gap between the two crushing rollers two. , thereby achieving different crushing granularities for scrap steel pipes.

Compared with the prior art, the beneficial effects of the present invention are:

1. When the present invention is in use, the arc-shaped material receiving plate one cooperates with the two pairs of arc-shaped material receiving plates to push the previous steel pipe to one side of the baffle, and then deflects to the initial position under the action of the hydraulic push rod one. The second material receiving plate first contacts the steel pipe on the left, and rotates relative to the arc-shaped material receiving plate 1 under the limit of the left steel pipe, until the arc-shaped material receiving plate 1 and the arc-shaped material receiving plate 2 can smoothly pass through the steel pipe. Obstructed and enters the installation slot, then the arc-shaped material receiving plate 2 is deflected to the initial state under the action of the torsion spring, and the hydraulic push rod drives the arc-shaped material receiving plate 1 and the arc-shaped material receiving plate 2 to push the next steel pipe. This enables continuous and even feeding of steel pipes, effectively avoiding the problem of material accumulation.

2. When the present invention is in use, the hydraulic push rod 2 pushes the pressure plate to move downward until the pressure plate presses the steel pipe into a flat shape. By opening an arc-shaped groove on the top of the loading platform 1, the steel pipe is limited by the arc-shaped groove. Under the pressure plate, the steel pipe can be squeezed stably to prevent the steel pipe from sliding out from the bottom of the pressure plate during the contact with the pressure plate, thereby causing extrusion failure. By extruding the steel pipe with a circular cross-section into a flat shape, It is convenient for the crushing equipment to grab and crush the steel pipe quickly and accurately.

3. When the present invention is in use, through the cooperation of the motor one and the stopper, the flat steel pipe can always maintain a moving position without deviation when sliding down to the crushing box. Through the electric push rod two, the rectangular limiter The mutual cooperation of the groove, the arc-shaped limit groove, the first and second contact blocks ensures that the flat steel pipe always maintains a stable and slow state during the descending process, thereby enabling the flat steel pipe to accurately and smoothly into the crushing box for crushing, solving the problem that the dumping method of existing scrap steel pipes is direct and rough, which can easily lead to the deviation of the falling position of the steel pipe, which is not conducive to its crushing, and can easily cause damage to the crushing rollers and other equipment inside it. damage.

4. When the present invention is in use, the electric push rod three pushes the crushing rollers two closer to each other through the frame. The crushing rollers two are driven by the motor three to perform secondary crushing of the initially crushed steel pipe slag. By changing the two crushing rollers two The gap between them can achieve different crushing granularity of scrap steel pipes.

Description of the drawings

In order to facilitate understanding by those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings;

Figure 1 is a structural side view of the material-carrying platform of the present invention;

Figure 2 is an enlarged structural schematic diagram of area A of Figure 1 in the present invention;

Figure 3 is a schematic structural diagram of the inclined plane table 1 and the inclined plane table 2 that carry the top of the material table 1 in the present invention;

Figure 4 is a side view of the rectangular limiting groove inside the second loading platform of the present invention;

Figure 5 is a top view of the overall structure of the present invention;

Figure 6 is a side view of the internal structure of the crushing box in the present invention.

Reference signs: 100. Loading material table one; 101. Inclined table one; 102. Inclined table two; 200. Loading material table two; 300. Crushing box; 4. Feeding assembly; 401. Curved material receiving plate one; 402 , curved material receiving plate two; 403, limit block; 404, bracket; 405, guide slide rail; 406, guide groove; 407, drive block; 408, hydraulic push rod one; 5, support seat; 6, horizontal platform ; 7. Hydraulic push rod two; 8. Pressure plate; 9. Arc groove; 10. Support plate; 11. Electric push rod one; 12. Push plate; 13. Rotating seat; 131. Motor one; 14. Buffer assembly ; 141. Chute; 142. Rectangular limit groove; 143. Arc limit groove; 144. Electric push rod two; 145. Contact block one; 146. Contact block two; 147. Block; 15. Broken Roller one; 16. Spur gear one; 17. Motor two; 18. Particle size adjustment component; 181. Electric push rod three; 182. Frame; 183. Crushing roller two; 184. Motor three; 19. Protective cover; 20. Block plate.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Example 1:

As shown in Figures 1 to 3, the present invention provides a technical solution: during the actual operation of the existing metal crusher used for crushing scrap metal, the material to be crushed in the crushing area cannot be separated and discharged at intervals. As a result, the scrap metal entering the metal crusher is affected by the efficiency of the crusher and forms material accumulation inside it. In order to achieve uniform and continuous cutting of scrap steel pipes, the specific improvements are as follows:

The scrap steel crushing device with adjustable crushing granularity includes a load-bearing platform 100. The top of the load-bearing platform 100 is fixedly installed with a slope table 101 and a slope table two 102. A load-bearing platform is provided on one side of the load-bearing platform 100. Two 200, a crushing box 300 is provided below the second loading platform 200, and a feeding assembly 4 is provided on the top of the inclined platform 101;

The feeding assembly 4 includes an arc-shaped material receiving plate 401, an arc-shaped material receiving plate 2 402 and a bracket 404. The bracket 404 is fixedly connected to the side of the inclined table 101, and one end of the arc-shaped material receiving plate 401 is rotatably connected in the bracket 404. , one end of the arc-shaped material receiving plate 402 is rotationally connected to the arc-shaped material receiving plate 401, and a torsion spring is provided at the rotational connection between the arc-shaped material receiving plate 401 and the arc-shaped material receiving plate 2 402. , so that the second arc-shaped material receiving plate 402 can deflect to the initial position by itself after being turned over. The bottom of the arc-shaped material receiving plate 401 is fixedly connected with a guide slide rail 405, and a guide groove 406 is provided inside the guide slide rail 405. A driving block 407 is slidably connected to the inside of the guide groove 406, and an installation groove is provided on the top of the loading platform 100. A hydraulic push rod 408 is fixedly installed in the installation groove, and the output end of the hydraulic push rod 408 is movably connected to the driving block 407. , the top of the loading platform 100 is fixedly connected with a baffle 20 .

Roll the steel pipe whose length matches the crushing box 300 to the top of the load-bearing platform 100 through the inclined platform 2 102. It should be noted here that the arc-shaped material receiving plate 401 and the arc-shaped material receiving plate 2 402 are on the hydraulic push rod 1. Under the action of 408, the initial position is located in the installation groove. During specific setting, the hydraulic push rod 408 cooperates with the driving block 407, the guide slide rail 405 and the guide groove 406 to make the arc-shaped material receiving plate 401 and the arc-shaped connector The second material plate 402 is pushed out from the installation slot, and the bottom of the arc-shaped material receiving plate 402 is fixed with a limit block 403 through spot welding. 401 pushes the steel pipe upward until the steel pipe slides out from the surface of the arc-shaped material receiving plate 401 and rolls through the inclined table 101 to a position close to the baffle 20. The steel pipe stays in the arc groove under the action of the baffle 20 Within 9.

Example 2:

As shown in Figures 1 and 5, affected by the shape of scrap metal, such as hollow spheres, hollow cylinders and other scrap metals with arc-shaped edges, scrap metal with similar shapes will cause the crushing claws to be unable to successfully grab and crush them. , which in turn causes the scrap metal to always roll above the crushing claws and form a blockage. To solve this problem, the specific improvements are as follows:

The top of the load-bearing material table 100 is fixedly connected with the support base 5. The top of the support base 5 is fixedly installed with the horizontal platform 6. The bottom of the horizontal platform 6 is fixedly connected with the hydraulic push rod 27. The bottom end of the hydraulic push rod 27 passes through the point. A pressure plate 8 is welded and fixed, a supporting plate 10 is fixedly installed on the side of the material-bearing platform 100, an electric push rod 11 is installed on the top of the supporting plate 10, and the output end of the electric push rod 11 is fixedly connected to a push plate 12;

During the specific setting, the hydraulic push rod 27 pushes the pressure plate 8 to move downward until the pressure plate 8 presses the steel pipe into a flat shape. By opening an arc groove 9 on the top of the loading platform 100, the steel pipe can Under the restriction, the pressure plate 8 can stably squeeze the steel pipe to avoid the problem of the steel pipe sliding out from the bottom of the pressure plate 8 during the contact with the pressure plate 8, thereby causing the extrusion failure. After the steel pipe is pressed into a flat shape by the pressure plate 8, The electric push rod 11 pushes the flat steel pipe to the top of the material loading table 2 200 through the push plate 12 .

Embodiment three:

As shown in Figures 4 and 5, if the flattened steel pipe is directly dumped into the crushing box 300 for crushing, the dumping process will easily cause the falling position of the steel pipe to shift, which is not conducive to its crushing. At the same time, the steel pipe has a large mass. If it is dumped directly and violently into the crushing box 300, it will easily cause damage to the crushing roller 15 and other equipment inside it. To solve this problem, specific improvements are as follows:

A rotating base 13 is provided below the second loading platform 200. Both ends of the second loading platform 200 are rotatably connected to the inside of the rotating base 13. A motor 131 is provided on the outside of the rotating base 13 for driving the second loading platform 200 to rotate. , The top of the second loading platform 200 is provided with a buffer assembly 14. The buffer assembly 14 includes a chute 141, a rectangular limiting groove 142 and an arc limiting groove 143. The top of the second loading platform 200 is symmetrically provided with a chute 141, and the sliding groove 141 is symmetrically provided on the top of the second loading platform 200. The side wall of the slot 141 is provided with a rectangular limit slot 142 and an arc-shaped limit slot 143. The rectangular limit slot 142 is connected with the arc-shaped limit slot 143. An electric push rod 144 is fixedly installed on the inner wall of the chute 141. There are abutting block one 145 and abutting block two 146 slidingly connected in 141. The output end of the electric push rod two 144 is fixedly connected with the abutting block one 145. The abutting block two 146 is rotationally connected with the abutting block one 145. The top of the second block 146 is fixedly connected with the stopper 147, and the two sides of the abutting block 145 and the second abutting block 146 are fixedly connected with convex blocks, and the convex blocks are slidingly connected to the rectangular limiting groove 142 and the arcuate limiting groove. Within 143;

During the specific setting, the motor one 131 drives the material-carrying platform two 200 to flip over. At this time, the flat steel pipe contacts the stopper 147 under the action of deflection. After the material-carrying platform two 200 deflects to an angle suitable for unloading, the electric push rod two 144 pushes the contact block one 145 and the contact block two 146 to slide in the rectangular limit groove 142. The flat steel pipe slides down synchronously with the stop block 147 under the effect of the tilt angle until the contact block two 146 slides to the arc limit. In the position slot 143, at this time, the stopper 147 is synchronously sliding and deflecting until it is out of contact with the flat steel pipe. The flat steel pipe slides from the top of the second loading platform 200 to the crushing box 300 for crushing.

By providing the motor one 131 and the cooperation between the motor one 131 and the stopper 147, the flat steel pipe can always maintain its moving position without deviation when sliding down to the crushing box 300. Through the electric push rod two 144, the rectangular The limiting groove 142, the arc-shaped limiting groove 143, the first abutting block 145 and the second abutting block 146 cooperate with each other to ensure that the flat steel pipe always maintains a stable and slow state during the descending process, making the flat steel pipe The steel pipe can accurately and smoothly enter the crushing box 300 for crushing.

Embodiment 4:

As shown in Figures 5 and 6, in order to achieve different crushing particle sizes for scrap steel pipes, the specific improvements are as follows:

The interior of the crushing box 300 is rotatably connected with two crushing rollers 15. The outside of the crushing box 300 is provided with a spur gear 16 fixedly connected to the crushing roller 15. The two spur gears 16 are meshed and connected. The outside of the crushing box 300 is provided with There is a motor 217 for driving the crushing roller 15. A particle size adjustment assembly 18 is provided inside the crushing box 300. The particle size adjustment assembly 18 includes two electric push rods 181 and two frames 182. The two electric push rods 181 are both Fixedly connected to the inner wall of the crushing box 300, the side of the frame 182 is fixedly connected to the output end of the electric push rod 3 181. The inner wall of the crushing box 300 is symmetrically fixed with a guide frame, and both ends of the frame 182 are respectively slidingly connected to the corresponding guide frames. Inside, a crushing roller two 183 is provided in the frame 182. A motor three 184 for driving the crushing roller two 183 is provided outside the frame 182. A protective cover 19 is fixedly installed on the top of the crushing box 300. By providing the protective cover 19, it can maximize To the greatest extent possible, the problem of debris generated when the steel pipe is broken is prevented from flying freely;

The two crushing rollers 15 perform preliminary crushing of the flat steel pipe, and then the electric push rod 3 181 pushes the crushing roller 183 closer to each other through the frame 182. The crushing roller 183 is driven by the motor 3 184 to crush the initially crushed steel pipe slag. Secondary crushing, by changing the gap between the two crushing rollers 183, can achieve different crushing particle sizes of scrap steel pipes.

Embodiment five:

As shown in Figures 1 and 2, in order to achieve continuous and uniform feeding of steel pipes, the specific improvements are as follows:

When the arc-shaped material receiving plate 401 cooperates with the arc-shaped material receiving plate 2 402 to push the steel pipe to one side of the baffle 20, it is deflected to the initial position under the action of the hydraulic push rod 408. In this process, the arc-shaped The second material receiving plate 402 first contacts the steel pipe on the left, and rotates relative to the arc-shaped material receiving plate 401 under the limit of the left steel pipe, until the arc-shaped material receiving plate 401 and the arc-shaped material receiving plate 2 402 can It successfully passes through the obstruction of the steel pipe and enters the installation slot. Then the arc-shaped material receiving plate 402 is deflected to the initial state under the action of the torsion spring. The hydraulic push rod 408 drives the arc-shaped material receiving plate 1 401 and the arc-shaped material receiving plate 2 402 pushes the next steel pipe to achieve continuous and even feeding of the steel pipe.

The above contents are only examples and descriptions of the structure of the present invention. Those skilled in the art may make various modifications or supplements to the described specific embodiments or substitute them in similar ways, as long as they do not deviate from the structure of the invention or Anything beyond the scope defined by the claims shall belong to the protection scope of the present invention.

In the description of this specification, reference to the terms "one embodiment," "example," "specific example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one aspect of the invention. in an embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are only intended to help illustrate the invention. The preferred embodiments do not describe all details, nor do they limit the invention to specific implementations. Obviously, many modifications and variations are possible in light of the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can better understand and utilize the present invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (4)

1. The crushing granularity-adjustable waste steel crushing device comprises a first bearing material table (100), and is characterized in that a first inclined surface table (101) and a second inclined surface table (102) are fixedly arranged at the top of the first bearing material table (100), a second bearing material table (200) is arranged at one side of the first bearing material table (100), a crushing box (300) is arranged below the second bearing material table (200), and a feeding component (4) is arranged at the top of the first inclined surface table (101);

the feeding assembly (4) comprises an arc-shaped receiving plate I (401), an arc-shaped receiving plate II (402) and a support (404), the support (404) is fixedly connected to the side face of the inclined plane platform I (101), one end of the arc-shaped receiving plate I (401) is rotationally connected in the support (404), one end of the arc-shaped receiving plate II (402) is rotationally connected with the arc-shaped receiving plate I (401), a torsion spring is arranged at the rotational connection position of the arc-shaped receiving plate I (401) and the arc-shaped receiving plate II (402), and a limiting block (403) is fixedly arranged at the bottom of the arc-shaped receiving plate II (402) through spot welding;

the device is characterized in that a guide sliding rail (405) is fixedly connected to the bottom of the first arc-shaped receiving plate (401), a guide groove (406) is formed in the guide sliding rail (405), a driving block (407) is slidably connected in the guide groove (406), a mounting groove is formed in the top of the first bearing material table (100), a first hydraulic push rod (408) is fixedly installed in the mounting groove, the output end of the first hydraulic push rod (408) is movably connected with the driving block (407), and a baffle plate (20) is fixedly connected to the top of the first bearing material table (100);

the automatic feeding device is characterized in that a supporting seat (5) is fixedly connected to the top of the first bearing material table (100), a transverse table (6) is fixedly arranged at the top of the supporting seat (5), a second hydraulic push rod (7) is fixedly connected to the bottom of the transverse table (6), a pressing plate (8) is fixedly arranged at the bottom end of the second hydraulic push rod (7) through spot welding, an arc-shaped groove (9) is formed in the top of the first bearing material table (100), a supporting plate (10) is fixedly arranged on the side surface of the first bearing material table (100), an electric push rod (11) is arranged at the top of the supporting plate (10), and a pushing plate (12) is fixedly connected to the output end of the first electric push rod (11);

the automatic feeding device is characterized in that a rotating seat (13) is arranged below the second bearing material table (200), two ends of the second bearing material table (200) are rotationally connected to the inner side of the rotating seat (13), a first motor (131) for driving the second bearing material table (200) to rotate is arranged on the outer side of the rotating seat (13), a buffer assembly (14) is arranged at the top of the second bearing material table (200), the buffer assembly (14) comprises a sliding groove (141), a rectangular limiting groove (142) and an arc limiting groove (143), the sliding groove (141) is symmetrically formed in the top of the second bearing material table (200), the rectangular limiting groove (142) and the arc limiting groove (143) are formed in the side wall of the sliding groove (141), and the rectangular limiting groove (142) is communicated with the arc limiting groove (143);

the electric push rod is characterized in that an electric push rod II (144) is fixedly arranged on the inner wall of the sliding groove (141), an abutting block I (145) and an abutting block II (146) are connected in a sliding mode in the sliding groove (141), the output end of the electric push rod II (144) is fixedly connected with the abutting block I (145), the abutting block II (146) is rotationally connected with the abutting block I (145), a stop block (147) is fixedly connected to the top of the abutting block II (146), lugs are fixedly connected to the two sides of the abutting block I (145) and the two sides of the abutting block II (146), and the lugs are slidably connected in the rectangular limiting groove (142) and the arc limiting groove (143).

2. The crushing granularity-adjustable waste steel crushing device according to claim 1, wherein two crushing rollers (15) are rotatably connected in the crushing box (300), a spur gear (16) fixedly connected with the crushing rollers (15) is arranged on the outer side of the crushing box (300), the two spur gears (16) are meshed and connected, a motor (17) for driving the crushing rollers (15) is arranged on the outer side of the crushing box (300), a granularity adjusting component (18) is arranged in the crushing box (300), the granularity adjusting component (18) comprises two electric pushing rods (181) and two frames (182), the two electric pushing rods (181) are fixedly connected to the inner wall of the crushing box (300), the side faces of the frames (182) are fixedly connected with the output ends of the electric pushing rods (181), guide frames are symmetrically fixed on the inner side walls of the crushing box (300), and the two ends of each frame (182) are respectively and slidably connected to the corresponding guide frames.

3. The waste steel crushing device with adjustable crushing granularity according to claim 2, wherein a crushing roller II (183) is arranged in the frame (182), a motor III (184) for driving the crushing roller II (183) is arranged on the outer side of the frame (182), and a protective cover (19) is fixedly arranged at the top of the crushing box (300).

4. A method of operating an adjustable size crushing mill for steel scrap according to claim 3, comprising the steps of:

step one: firstly, placing a waste steel pipe on the top of a first bearing material table (100), driving a first arc-shaped material receiving plate (401) to deflect by the mutual matching of a driving block (407) and a guide sliding rail (405) of a first hydraulic push rod (408), driving a steel pipe borne on the top of the first arc-shaped material receiving plate (402) to move upwards by the mutual matching of a limiting block (403) and the first arc-shaped material receiving plate (401) until the first arc-shaped material receiving plate (401) and the second arc-shaped material receiving plate (402) mutually match to push the steel pipe to a position close to a baffle plate (20) through a first inclined surface table (101), and stopping the bottom of the steel pipe on the top of an arc-shaped groove (9) under the action of the baffle plate (20), wherein the arc-shaped groove (9) matched with the steel pipe is arranged, so that the steel pipe is prevented from slipping in the extrusion process;

step two: the hydraulic push rod II (7) pushes the pressing plate (8) to move downwards until the pressing plate (8) extrudes the steel pipe to be flat, the steel pipe is extruded to be flat, so that the problem that the crushing roller I (15) cannot effectively grab the cambered steel pipe and effectively crush the cambered steel pipe is solved, then the electric push rod I (11) pushes the flat steel pipe to the top of the bearing material platform II (200) through the push plate (12), then the motor I (131) drives the bearing material platform II (200) to deflect until the bearing material platform II is deflected to an angle convenient for blanking, the electric push rod II (144) is started again, the electric push rod II (144) pushes the abutting block I (145) and the abutting block II (146) to move until the abutting block II (146) slides into the arc-shaped limiting groove (143), and meanwhile the top end of the stop block (147) is lower than the upper surface of the bearing material platform II (200), and further the flat steel pipe is slowly conveyed to the space between the two crushing rollers I (15) to be crushed;

step three: the two crushing rollers I (15) crush the flat steel pipes, and meanwhile, in order to achieve different crushing granularity of the waste steel pipes, the electric push rod III (181) pushes the crushing rollers II (183) to be close to each other through the frame (182), and the different crushing granularity of the waste steel pipes is achieved by changing the gap between the two crushing rollers II (183).