Limestone crushing and grading device

Abstract

The utility model relates to a kind of limestone crushing classification device, belong to limestone processing technical field.It includes primary processing box, and the lower end of primary processing box is detachably spliced with multiple groups secondary processing box, and the inside lower half portion of primary processing box is sequentially separated into crushing bin and primary screening bin by a vertically fixed partition from left to right.The utility model is provided with crushing bin and primary screening bin in primary processing box, material is first passed through the primary screen of primary screening bin upper end before entering crushing bin, at this time, qualified limestone material will directly pass through primary screen and drop into primary screening bin, further reduce the load of crushing assembly, also avoid the secondary crushing of qualified limestone material.The utility model can also assemble the proper number of secondary processing box according to actual processing demand, and the inside sieve drawer screen hole size of multiple groups secondary processing box is gradually reduced from top to bottom, so that the classification screening of limestone of different granularity size is realized.

Description

Technical Field

[0001] This utility model relates to the field of limestone processing technology, and in particular to a limestone crushing and grading device. Background Technology

[0002] Limestone is an important industrial raw material, widely used in construction, metallurgy, chemical industry and other fields. In its processing, it usually needs to go through two key stages: crushing and grading, to ensure that its particle size meets the requirements in different applications.

[0003] However, existing limestone crushing equipment typically uses a whole-piece feeding method, putting all the material into the crushing chamber for processing. This results in some qualified limestone material being dumped into the crushing equipment as well. This not only increases the load on the crushing equipment but also causes qualified limestone material to be repeatedly crushed, resulting in over-crushing and an increase in powder content. Secondly, existing crushing equipment fails to perform grading processing on the crushed limestone. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides a limestone crushing and grading device. The technical solution of this utility model is as follows: A limestone crushing and grading device includes a primary processing box, the lower end of which is detachably connected to multiple sets of secondary processing boxes. The lower half of the interior of the primary processing box is divided into a crushing chamber and a primary screening chamber from left to right by a vertically fixed partition. The crushing chamber is equipped with crushing components. The top of the primary screening chamber is inclined with a primary screen plate, which is inclined downward toward the crushing chamber. The lower end of the primary screen plate is fixedly connected to the upper end of the partition. The upper opening of the primary processing box is fixedly connected to a top plate. The surface of the top plate and above the upper end of the primary screen plate is provided with a feed inlet. The lower opening of the primary processing box is fixedly connected to a first bottom frame. A material discharge rectangular frame is fixedly connected to the inner side of the first bottom frame. The uppermost secondary processing box is detachably connected to the lower part of the material dropping rectangular frame. The upper and lower ends of the secondary processing box are open, and a rectangular opening is provided on its right side wall. A screen drawer is slidably connected inside the secondary processing box. The right side of the screen drawer is open and the opening is connected to the rectangular opening. A drive assembly for driving the screen drawer to move back and forth is connected to the left side of the secondary processing box. A material gathering frame is fixedly connected to the lower end of the screen drawer. In the multiple sets of secondary processing boxes, the size of the sieve holes in the internal sieve drawers decreases progressively from top to bottom.

[0005] Optionally, a feed hopper is fixedly connected to the feed inlet, and a maintenance port is provided through the surface of the top plate on one side of the feed inlet, with a cover plate detachably connected to the upper end of the maintenance port.

[0006] Optionally, an outer housing is fixedly connected to the rear side wall of the primary processing box. The crushing assembly includes two sets of crushing rollers rotating in opposite directions and a set of motors. Roller shafts are fixedly connected to the center of each of the two sets of crushing rollers. The rear ends of the two sets of roller shafts rotatably penetrate the rear side wall of the primary processing box and extend into the interior of the outer housing. Gears are fixedly fitted on the rear ends of the two sets of roller shafts, and the two sets of gears mesh with each other. The rear end of one set of roller shafts is fixedly connected to the output shaft of the motor, and the motor is fixedly connected to the outside of the outer housing.

[0007] Optionally, the primary screen plate includes two sets of parallel support beams, one high and one low, and multiple sets of screen bars. The two sets of support beams are respectively fixedly connected to the left and right sides of the upper end of the primary screening chamber. The screen bars are perpendicular to the support beams and locked together by fasteners. The fasteners consist of two sets of symmetrical L-shaped lugs. The horizontal side of the L-shaped lugs is fixedly connected to the upper surface of the support beams by bolts, and the vertical side of the L-shaped lugs is fixedly connected to the side wall of the screen bars by bolts.

[0008] Optionally, a guide plate is fixedly connected to the right side wall of the primary screening chamber and below the primary screening plate. The inclined direction of the guide plate is consistent with that of the primary screening plate, and a material drop gap is formed between the partition and the lower end of the guide plate.

[0009] Optionally, the secondary processing box includes a box frame and side panels. The box frame has openings at the top, bottom, and right sides. The side panels are fixedly connected to the right side opening of the box frame. A rectangular opening is formed on the side panel. A discharge hopper connected to the rectangular opening is fixedly connected to the outer side of the side panel. A top frame is fixedly connected to the top opening of the box frame. The inner opening of the top frame is a discharge port. A discharge rectangular frame is movably inserted into the discharge port of the uppermost secondary processing box. L-shaped fixing plates are fixedly connected to the upper surface of the top frame and to the left and right sides of the discharge port. The vertical edges of the L-shaped fixing plates are fixedly connected to the discharge rectangular frame by bolts. A second bottom frame is fixedly connected to the bottom opening of the box frame. A second discharge rectangular frame with the same size as the first discharge rectangular frame is fixedly connected to the inside of the second bottom frame.

[0010] Optionally, the sieve tray includes a C-shaped frame, which is laterally slidably connected to the inside of the box frame. The material gathering frame is fixedly connected to the lower opening of the C-shaped frame. Right-angled triangular seats for gathering materials are symmetrically fixed on the right side of the inside of the C-shaped frame. A secondary sieve plate inclined to the right is fixedly connected inside the C-shaped frame. A U-shaped hopper is fixedly connected to the right side of the two sets of right-angled triangular seats and the right side of the secondary sieve plate. The U-shaped hopper is laterally slidably connected to the inside of the rectangular opening.

[0011] Optionally, a support base is fixedly connected to the left side wall of the box frame, and a movable hole is opened through the left side wall of the box frame. The drive assembly includes a linear reciprocating driver and a movable rod. The linear reciprocating driver is fixedly connected to the support base. The left end of the movable rod is fixedly connected to the output end of the linear reciprocating driver. The right end of the movable rod passes through the movable hole and extends into the interior of the box frame. The right end of the movable rod is fixedly connected to the left side wall of the C-shaped frame.

[0012] Optionally, the left and right sides inside the material collection frame are respectively fixedly connected to material collection inclined plate one and material collection inclined plate two, and both material collection inclined plate one and material collection inclined plate two are inclined towards the middle and their lower ends together form a material drop port.

[0013] All of the above optional technical solutions can be combined arbitrarily, and this utility model does not provide a detailed description of the structure after each combination.

[0014] The beneficial effects of this utility model through the above solution are as follows: 1. This utility model sets up a crushing chamber and a primary screening chamber in the primary processing box. Before the material enters the crushing chamber, it passes through the primary screening plate at the top of the primary screening chamber. At this time, qualified limestone material will directly pass through the primary screening plate and fall into the primary screening chamber, while unqualified large pieces of limestone material will slide along the inclined direction of the primary screening plate into the crushing chamber for crushing. This further reduces the load on the crushing components and avoids secondary crushing of qualified limestone material.

[0015] 2. This utility model can assemble an appropriate number of secondary processing boxes according to actual processing needs. The screen hole size of the internal sieve drawer of multiple sets of secondary processing boxes decreases from top to bottom, thereby realizing the grading and screening of limestone of different particle sizes.

[0016] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 Schematic diagram of the overall appearance structure of the limestone crushing and grading device provided by this utility model Figure 1 ; Figure 2 Schematic diagram of the overall appearance structure of the limestone crushing and grading device provided by this utility model Figure 2 ; Figure 3 A front cross-sectional view of the limestone crushing and grading device provided by this utility model; Figure 4 A schematic diagram of the exploded structure of the limestone crushing and grading device provided by this utility model; Figure 5 This is a schematic diagram of the structure of the primary processing box, crushing component, primary screen plate and guide inclined plate in this utility model; Figure 6 This is an exploded structural diagram of the primary sieve plate in this utility model; Figure 7 This is a schematic diagram of the structure of the secondary processing box, sieve drawer and drive assembly in this utility model. Figure 8 This is an exploded structural diagram of the secondary processing box, sieve, drive assembly, and material collection frame in this utility model.

[0018] Numbered in the diagram: 1. Primary processing box; 11. Baffle plate; 12. Crushing chamber; 121. Guide ramp; 13. Primary screening chamber; 14. Top plate; 141. Feed inlet; 142. Maintenance port; 15. Feed hopper; 16. Cover plate; 17. Outer casing; 18. First bottom frame; 19. Material discharge rectangular frame one; 2. Crushing assembly; 21. Crushing roller; 22. Roller shaft; 23. Gear; 24. Motor; 3. Primary screen plate; 31. Support beam; 32. Screen bar; 33. Fixing component; 331. L-shaped lug; 4. Guide ramp; 5. Secondary processing box; 51. Box frame; 511. Guide strip; 512. Movable hole; 513. Support base; 52. Side plate; 521. Rectangular opening; 53. Discharge hopper; 54. Top frame; 541. Discharge port; 55. L-shaped fixing plate; 56. Second bottom frame; 57. Secondary discharge rectangular frame; 6. Screen drawer; 61. C-shaped frame; 611. Guide groove; 62. Right-angled triangular base; 63. Secondary screen plate; 64. U-shaped hopper; 7. Drive assembly; 71. Linear reciprocating driver; 72. Movable rod; 8. Material gathering frame; 81. First material gathering inclined plate; 82. Secondary material gathering inclined plate; 83. Discharge port; 9. Support leg. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0020] Please see Figure 1-8 This utility model provides a limestone crushing and grading device, including a primary processing box 1, and multiple sets of secondary processing boxes 5 are detachably spliced ​​at the lower end of the primary processing box 1. The lower half of the interior of the primary processing box 1 is divided into a crushing chamber 12 and a primary screening chamber 13 from left to right by a vertically fixed partition 11. The crushing chamber 12 is equipped with a crushing component 2. The primary screening chamber 13 is inclined at the top and the primary screening plate 3 is inclined downward toward the crushing chamber 12. The lower end of the primary screening plate 3 is fixedly connected to the upper end of the partition 11. The upper opening of the primary processing box 1 is fixedly connected to a top plate 14. The surface of the top plate 14 and above the upper end of the primary screening plate 3 is provided with a feed inlet 141. The lower opening of the primary processing box 1 is fixedly connected to a first bottom frame 18. The inner side of the first bottom frame 18 is fixedly connected to a material dropping rectangular frame 19. The lower end of the left side wall of the crushing chamber 12 and the upper surface of the first bottom frame 18 are fixedly connected to a guide ramp 121. The uppermost secondary processing box 5 is detachably connected to the lower part of the material dropping rectangular frame 19. The upper and lower ends of the secondary processing box 5 are open, and a rectangular opening 521 is provided on its right side wall. A screen 6 is slidably connected inside the secondary processing box 5. The right side of the screen 6 is open and the opening is connected to the rectangular opening 521. A drive assembly 7 for driving the screen 6 to move back and forth is connected to the left side of the secondary processing box 5. A material gathering frame 8 is fixedly connected to the lower end of the screen 6. In the multiple secondary processing boxes 5, the screen hole size of the internal screen drawer 6 decreases from top to bottom, and the bottom four corners of the lowest secondary processing box 5 are all fixedly connected to support legs 9 by bolts.

[0021] This invention features a crushing chamber 12 and a primary screening chamber 13 within the primary processing box 1. Before entering the crushing chamber 12, the material passes through the primary screening plate 3 at the top of the primary screening chamber 13. Qualified limestone material passes directly through the primary screening plate 3 and falls into the primary screening chamber 13, while unqualified large pieces of limestone slide along the inclined direction of the primary screening plate 3 into the crushing chamber 12 for crushing. This further reduces the load on the crushing component 2 and avoids secondary crushing of qualified limestone material. Finally, the material entering the primary screening chamber 13 and the material crushed in the crushing chamber 12 both fall through the discharge rectangular frame 19 onto the internal screen tray 6 of the secondary processing box 5.

[0022] This invention allows for the assembly of a suitable number of secondary processing boxes 5 according to actual processing needs. The screen aperture size of the internal screen trays 6 of multiple sets of secondary processing boxes 5 decreases progressively from top to bottom, thereby achieving graded screening of limestone of different particle sizes. Specifically, the material falling from the primary screening chamber 13 and the crushing chamber 12 will fall into the screen trays 6 inside the secondary processing box 5. Under the action of the drive component 7, the screen trays 6 move back and forth. At this time, the material smaller than the screen aperture size of the set of screen trays 6 will fall onto the internal screen trays 6 of the next level of processing box 5 for further screening, while the material larger than the screen aperture size of the set of screen trays 6 will be discharged along the right opening and rectangular opening 521 of the screen tray 6 under the action of left and right shaking.

[0023] By setting up the material collection frame 8, it can be ensured that when the screen tray 6 moves back and forth, the material screened by the upper screen tray 6 can be collected by the material collection frame 8 and then accurately fall onto the lower screen tray 6, thereby avoiding splashing during the falling process.

[0024] Specifically, the feed inlet 141 is located above the high end of the primary screen plate 3, which allows the material entering through the feed inlet 141 to fall to the high end of the primary screen plate 3, thereby ensuring that the material can completely pass through the primary screen plate 3 and improving screening efficiency.

[0025] Furthermore, a feed hopper 15 is fixedly connected to the feed inlet 141, and a maintenance port 142 is provided through the surface of the top plate 14 and on one side of the feed inlet 141. A cover plate 16 is detachably connected to the upper end of the maintenance port 142 by bolts.

[0026] Specifically, the feed hopper 15 adopts a conical shape, which can effectively expand the feeding area. The maintenance port 142 is designed to facilitate subsequent maintenance and cleaning by staff.

[0027] Furthermore, an outer housing 17 is fixedly connected to the rear side wall of the primary processing box 1. The crushing assembly 2 includes two sets of crushing rollers 21 that rotate in opposite directions and a set of motors 24. Roller shafts 22 are fixedly connected to the center of each of the two sets of crushing rollers 21. The rear ends of the two sets of roller shafts 22 rotate through the rear side wall of the primary processing box 1 and extend into the interior of the outer housing 17. Gears 23 are fixedly sleeved on the rear ends of the two sets of roller shafts 22. The two sets of gears 23 mesh with each other. The rear end of one set of roller shafts 22 is fixedly connected to the output shaft of the motor 24. The motor 24 is fixedly connected to the outside of the outer housing 17.

[0028] Specifically, the output shaft of the motor 24 drives one set of roller shafts 22 to rotate. At this time, the gear 23 on the outside of the roller shaft 22 also rotates synchronously, thereby driving the other set of gears 23 meshing with it to rotate in the opposite direction. At this time, the two sets of roller shafts 22 and the two sets of crushing rollers 21 rotate towards the middle position synchronously, thereby crushing the material entering the crushing chamber 12.

[0029] Furthermore, the primary screen plate 3 includes two sets of parallel support beams 31, one high and one low, and multiple sets of screen bars 32. The two sets of support beams 31 are fixedly connected to the left and right sides of the upper end of the primary screening chamber 13, respectively. The screen bars 32 are perpendicular to the support beams 31 and are locked together by fasteners 33. The fasteners 33 consist of two sets of symmetrical L-shaped lugs 331. The horizontal side of the L-shaped lugs 331 is fixedly connected to the upper surface of the support beams 31 by bolts, and the vertical side of the L-shaped lugs 331 is fixedly connected to the side wall of the screen bars 32 by bolts.

[0030] Specifically, the screen bar 32 is fixed to the support beam 31 by the fastener 33, which facilitates the subsequent disassembly and replacement of the screen bar 32.

[0031] Furthermore, a guide plate 4 is fixedly connected to the right side wall of the primary screening chamber 13 and below the primary screening plate 3. The inclined direction of the guide plate 4 is consistent with that of the primary screening plate 3, and a material drop gap is formed between the partition plate 11 and the lower end of the guide plate 4.

[0032] Specifically, by setting the guide plate 4, the material falling in the primary screening chamber 13 can be guided to the left side area, thereby ensuring that the material can fall into the left side area of ​​the screen tray 6 inside the secondary processing box 5. This is because the screen tray 6 discharges from the right side, which ensures that the material can be fully screened inside the screen tray 6.

[0033] Furthermore, the secondary processing box 5 includes a box frame 51 and a side plate 52. The box frame 51 has openings at the top, bottom, and right sides. The side plate 52 is fixedly connected to the right opening of the box frame 51. A rectangular opening 521 is opened on the side plate 52. A discharge hopper 53 connected to the rectangular opening 521 is fixedly connected to the outside of the side plate 52. A top frame 54 is fixedly connected to the top opening of the box frame 51. The inner opening of the top frame 54 is a discharge port 541. A discharge rectangular frame 19 is movably inserted into the discharge port 541 of the uppermost secondary processing box 5. An L-shaped fixing plate 55 is fixedly connected to the upper surface of the top frame 54 and to both sides of the discharge port 541. The vertical edge of the L-shaped fixing plate 55 is fixedly connected to the discharge rectangular frame 19 by bolts. A second bottom frame 56 is fixedly connected to the lower opening of the box frame 51. A second discharge rectangular frame 57 with the same size as the discharge rectangular frame 19 is fixedly connected inside the second bottom frame 56.

[0034] Specifically, when fixing the secondary processing box 5 to the primary processing box 1, the discharge port 541 inside the top frame 54 is inserted into the lower end of the discharge rectangular frame 19, and then the L-shaped fixing plate 55 is fixed to the discharge rectangular frame 19 using bolts. Secondly, when splicing the two sets of secondary processing boxes 5, the discharge port 541 of the lower-level secondary processing box 5 is inserted into the lower end of the discharge rectangular frame 57 in the upper-level secondary processing box 5, and then the L-shaped fixing plate 55 is fixed to the discharge rectangular frame 57 using bolts. Furthermore, by installing a discharge hopper 53 at the rectangular opening 521, a guide chute is provided for the screened material, ensuring smooth material discharge.

[0035] Furthermore, the sieve tray 6 includes a C-shaped frame 61, which is laterally slidably connected to the inside of the box frame 51. The material gathering frame 8 is fixedly connected to the lower opening of the C-shaped frame 61. Right-angled triangular seats 62 for gathering materials are symmetrically fixed on the right side of the inside of the C-shaped frame 61. A secondary sieve plate 63 inclined to the right is fixedly connected inside the C-shaped frame 61. A U-shaped hopper 64 is fixedly provided on the right side of the two sets of right-angled triangular seats 62 and the right side of the secondary sieve plate 63. The U-shaped hopper 64 is laterally slidably connected to the inside of the rectangular opening 521.

[0036] Specifically, guide strips 511 are fixedly connected to the inner front and rear side walls of the box frame 51, and guide grooves 611 that cooperate with the guide strips 511 are opened on the outer front and rear side walls of the C-shaped frame 61. Through the cooperation of the guide strips 511 and the guide grooves 611, it is ensured that the C-shaped frame 61 can slide laterally within the box frame 51 along a predetermined path. Secondly, the right-angled sides of the two sets of right-angled triangular seats 62 are fixedly connected to the inner front and rear side walls of the C-shaped frame 61, so that the hypotenuses of the two sets of right-angled triangular seats 62 face each other, forming a material gathering effect. By setting two sets of right-angled triangular seats 62, the material on the secondary screen plate 63 can be gathered at the right outlet, ensuring that the material can be gradually guided into the U-shaped hopper 64 along the inner side wall of the C-shaped frame 61 and the hypotenuse of the right-angled triangular seats 62. In addition, by setting up a U-shaped hopper 64, when the screen tray 6 moves back and forth, it will drive the U-shaped hopper 64 to move back and forth synchronously. During this process, the U-shaped hopper 64 is always within the rectangular opening 521, thereby ensuring that the material on the screen tray 6 can slide down through the U-shaped hopper 64 into the discharge hopper 53.

[0037] Furthermore, a support base 513 is fixedly connected to the left side wall of the box frame 51, and an movable hole 512 is opened through the left side wall of the box frame 51. The drive assembly 7 includes a linear reciprocating driver 71 and a movable rod 72. The linear reciprocating driver 71 is fixedly connected to the support base 513. The left end of the movable rod 72 is fixedly connected to the output end of the linear reciprocating driver 71. The right end of the movable rod 72 passes through the movable hole 512 and extends into the interior of the box frame 51. The right end of the movable rod 72 is fixedly connected to the left side wall of the C-shaped frame 61.

[0038] Specifically, the linear reciprocating drive 71 can be a linear reciprocating motor. When the linear reciprocating motor is running, its output shaft drives the movable rod 72 to move linearly back and forth, thereby driving the C-shaped frame 61 of the screen tray 6 to move back and forth left and right, so as to achieve the effect of screening materials.

[0039] Furthermore, the left and right sides of the material collection frame 8 are respectively fixedly connected to the material collection inclined plate 1 81 and the material collection inclined plate 2 82, and both the material collection inclined plate 1 81 and the material collection inclined plate 2 82 are inclined towards the middle, and their lower ends together form the material drop port 83.

[0040] Specifically, the material screened through the upper screen tray 6 is gathered at the discharge port 83 by the combined action of the first and second material-gathering inclined plates 81 and then falls onto the lower screen tray 6. Since the screen tray 6 is in a continuous reciprocating motion, the discharge port 83 ensures that the falling material accurately lands on the lower screen tray 6, preventing material scattering. Furthermore, the discharge port 83 is angled towards the left side of the material-gathering frame 8, ensuring that the material falls from the discharge port 83 to the left side of the lower screen tray 6, thus ensuring thorough screening.

[0041] The above are merely preferred embodiments of this utility model and are not intended to limit this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A limestone crushing and grading device, characterized in that: It includes a primary processing box (1), and multiple secondary processing boxes (5) are detachably spliced ​​at the lower end of the primary processing box (1). The lower part of the interior of the primary processing box (1) is divided into a crushing chamber (12) and a primary screening chamber (13) from left to right by a vertically fixed partition (11). The crushing chamber (12) is equipped with a crushing component (2). The primary screening chamber (13) is inclined with a primary screen plate (3) at the top and the primary screen plate (3) is inclined downward toward the crushing chamber (12). The lower end of the primary screen plate (3) is fixedly connected to the upper end of the partition (11). The upper opening of the primary processing box (1) is fixedly connected to a top plate (14). The surface of the top plate (14) and above the upper end of the primary screen plate (3) is provided with a feed inlet (141). The lower opening of the primary processing box (1) is fixedly connected to a first bottom frame (18). The inner side of the first bottom frame (18) is fixedly connected to a material dropping rectangular frame (19). The uppermost secondary processing box (5) is detachably connected to the bottom of the material dropping rectangular frame (19). The upper and lower ends of the secondary processing box (5) are open, and a rectangular opening (521) is provided on its right side wall. A screen (6) is slidably connected inside the secondary processing box (5). The right side of the screen (6) is open and the opening is connected to the rectangular opening (521). A drive assembly (7) for driving the screen (6) to move back and forth is connected to the left side of the secondary processing box (5). A material gathering frame (8) is fixedly connected to the lower end of the screen (6). In the multiple sets of secondary processing boxes (5), the size of the sieve holes in the internal sieve drawers (6) decreases from top to bottom.

2. The limestone crushing and grading device according to claim 1, characterized in that, A feed hopper (15) is fixedly connected to the feed inlet (141), and a maintenance port (142) is provided through the surface of the top plate (14) and on one side of the feed inlet (141). A cover plate (16) is detachably connected to the upper end of the maintenance port (142).

3. The limestone crushing and grading device according to claim 1, characterized in that, The rear side wall of the primary processing box (1) is fixedly connected to an outer box (17). The crushing assembly (2) includes two sets of crushing rollers (21) rotating in opposite directions and a set of motors (24). The center of each of the two sets of crushing rollers (21) is fixedly connected to a roller shaft (22). The rear ends of the two sets of roller shafts (22) rotate through the rear side wall of the primary processing box (1) and extend into the interior of the outer box (17). The rear ends of the two sets of roller shafts (22) are fixedly fitted with gears (23). The two sets of gears (23) mesh with each other. The rear end of one set of roller shafts (22) is fixedly connected to the output shaft of the motor (24). The motor (24) is fixedly connected to the outside of the outer box (17).

4. The limestone crushing and grading device according to claim 1, characterized in that, The primary sieve plate (3) includes two sets of parallel support beams (31) of different heights and multiple sets of sieve bars (32). The two sets of support beams (31) are fixedly connected to the left and right sides of the upper end of the primary screening chamber (13). The sieve bars (32) and the support beams (31) are perpendicular to each other and locked together by fasteners (33). The fasteners (33) consist of two sets of symmetrical L-shaped lugs (331). The horizontal side of the L-shaped lugs (331) is fixedly connected to the upper surface of the support beams (31) by bolts, and the vertical side of the L-shaped lugs (331) is fixedly connected to the side wall of the sieve bars (32) by bolts.

5. A limestone crushing and grading device according to claim 1, characterized in that, A guide plate (4) is fixedly connected to the right side wall of the primary screening chamber (13) and below the primary screening plate (3). The inclined direction of the guide plate (4) is consistent with that of the primary screening plate (3). A material drop gap is formed between the partition plate (11) and the lower end of the guide plate (4).

6. A limestone crushing and grading device according to claim 1, characterized in that, The secondary processing box (5) includes a box frame (51) and a side plate (52). The box frame (51) has openings at the top, bottom, and right side. The side plate (52) is fixedly connected to the right opening of the box frame (51). A rectangular opening (521) is opened on the side plate (52). A discharge hopper (53) connected to the rectangular opening (521) is fixedly connected to the outside of the side plate (52). A top frame (54) is fixedly connected to the upper opening of the box frame (51). The internal opening of the top frame (54) is a discharge port (541). The discharge rectangular frame... (19) The uppermost secondary processing box (5) is movably inserted into the discharge port (541). The upper surface of the top frame (54) and the left and right sides of the discharge port (541) are fixedly connected with L-shaped fixing plates (55). The vertical side of the L-shaped fixing plate (55) is fixedly connected to the first discharge rectangular frame (19) by bolts. The lower opening of the box frame (51) is fixedly connected with a second bottom frame (56). The inside of the second bottom frame (56) is fixedly connected with a second discharge rectangular frame (57) with the same size as the first discharge rectangular frame (19).

7. A limestone crushing and grading device according to claim 6, characterized in that, The sieve tray (6) includes a C-shaped frame (61), which is laterally slidably connected to the inside of the box frame (51). The material gathering frame (8) is fixedly connected to the lower opening of the C-shaped frame (61). Right-angled triangular seats (62) for gathering materials are symmetrically fixed on the right side of the inside of the C-shaped frame (61). A secondary sieve plate (63) inclined to the right is fixedly connected inside the C-shaped frame (61). A U-shaped bucket (64) is fixedly provided on the right side of the two sets of right-angled triangular seats (62) and the right side of the secondary sieve plate (63). The U-shaped bucket (64) is laterally slidably connected to the inside of the rectangular opening (521).

8. A limestone crushing and grading device according to claim 7, characterized in that, The left side wall of the box frame (51) is fixedly connected to a support base (513). The left side wall of the box frame (51) is provided with a through hole (512). The drive assembly (7) includes a linear reciprocating driver (71) and a movable rod (72). The linear reciprocating driver (71) is fixedly connected to the support base (513). The left end of the movable rod (72) is fixedly connected to the output end of the linear reciprocating driver (71). The right end of the movable rod (72) passes through the movable hole (512) and extends into the interior of the box frame (51). The right end of the movable rod (72) is fixedly connected to the left side wall of the C-shaped frame (61).

9. A limestone crushing and grading device according to claim 1, characterized in that, The material collection frame (8) has two fixed connections on its left and right sides respectively. The material collection inclined plate one (81) and the material collection inclined plate two (82) are both inclined towards the middle and their lower ends together form a material drop port (83).

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