Adjustable road surface breaking device and use method thereof

Abstract

The present invention discloses an adjustable pavement crushing device in the technical field of pavement crushing devices, comprising a frame, a lifting column movably connected to the right side of the top outer wall of the limit plate, annular grooves are provided on the top and bottom of the annular outer wall of the sleeve, and an outer gear ring is clamped in the annular groove. During crushing, since the telescopic length of the electric telescopic rod is a fixed value, the screw rod can be rotated to adjust the initial position of the lifting column, so that the depth of the descent of the lifting column can be adjusted. During the crushing process, the electric push rod can be started to adjust the height of the lifting plate. The lifting of the lifting plate will change the height of the sleeve from the ground, and the inner diameter of the sleeve increases from top to bottom. Therefore, during the descent of the sleeve, the distance between the crushing plate and the annular inner wall of the sleeve will decrease, and the distance between the crushing teeth arranged on the opposite side of the sleeve and the crushing plate will also decrease. The rotating motor drives the two groups of crushing teeth in the opposite direction of the rotation of the motor to crush the stones to different degrees.

Description

Technical Field

[0001] The present invention relates to the technical field of road surface crushing devices, and in particular to an adjustable road surface crushing device and a use method thereof. Background Art

[0002] When crushing unqualified or damaged road surfaces, workers usually use a handheld crushing device (a device that uses a motor to drive the milling rotor to rotate for crushing) to crush the road surface. However, the crushed stones are of different sizes, and large stones are not conducive to later processing. They need to be crushed for secondary use, which increases the subsequent workload. In addition, the crushing depth of the road surface needs to be adjusted based on the operator's experience, and the accuracy is poor. For this reason, we propose an adjustable road surface crushing device. Summary of the invention

[0003] The object of the present invention is to provide an adjustable road surface breaking device and a method of using the same to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an adjustable road breaking device comprises a frame, a traction member is provided on the right end face of the frame, an adjusting screw rod is provided at the center of the top outer wall of the frame, grooves are provided on the inner walls on the left and right sides of the frame, and a drive box is slidably connected in the two sets of grooves, the bottom of the adjusting screw rod extends to the inner cavity of the frame and is connected to the top outer wall of the drive box through a bearing, an electric telescopic rod is provided on the right side of the top inner wall of the drive box, a rotating connecting piece is provided in the middle of the bottom inner wall of the drive box, a driving plate is provided on the front end surface of the rotating connecting piece, the bottom of the electric telescopic rod extends to the bottom outer wall of the drive box and is hinged to the right end of the driving plate, a movable groove is provided on the right side of the bottom outer wall of the drive box to cooperate with the movement of the driving plate, a sliding groove is provided on the left side of the bottom outer wall of the driving plate, a limiting plate is provided at the bottom of the left inner wall of the drive box, a lifting column is movably inserted on the right side of the top outer wall of the limiting plate, the top of the lifting column is slidably connected to the sliding groove, and the bottom of the lifting column extends to the drive box The bottom outer wall is provided with a crushing assembly, the bottom outer wall of the frame is provided with a slot matching the crushing assembly, the crushing assembly includes a fixing plate fixedly sleeved on the outer wall of the lifting column, the fixing plate is located on the outer wall of the bottom of the driving box, and electric push rods are provided on the left and right sides of the bottom outer wall of the fixing plate, and the two groups of electric push rods are fixedly connected to the bottom of the lifting plate, the lifting plate is slidably sleeved on the outer wall of the lifting column, the bottom of the lifting plate is provided with an annular groove, and the annular groove is located on the outside of the lifting column, and a sleeve is slidably connected in the annular groove, and the sleeve is provided with annular grooves at the top and bottom of the outer wall of the ring, and an outer gear ring is clamped in the annular groove, and a motor is provided at the left end of the top outer wall of the lifting plate, the motor is located on the left side of the left electric push rod, and a rotating rod is provided at the output end of the bottom of the motor, and the bottom of the rotating rod extends to the outer wall of the bottom of the lifting plate, and the outer wall of the rotating rod located at the bottom of the lifting plate is provided with an upper and lower groups of gears, the right end of the gear is meshed with the left end of the outer gear ring, and a crushing knife assembly is provided at the bottom of the lifting column.

[0005] Furthermore, the crushing knife assembly includes a mounting groove arranged at the bottom of the lifting column, a perforated plate is provided at the bottom of the mounting groove, a mounting shell is provided at the top of the perforated plate, a rotating motor is provided in the inner cavity of the mounting shell, a knife shaft is provided at the bottom output end of the rotating motor, the bottom of the knife shaft extends to the outer wall of the bottom of the orifice plate, and the outer wall of the bottom part of the orifice plate where the knife shaft extends is sequentially installed with a crushing plate and a spiral blade from top to bottom.

[0006] Furthermore, the inner diameter of the sleeve increases from top to bottom, the crushing plate is truncated cone-shaped, the top diameter is larger than the bottom diameter, and crushing teeth are provided on the annular inner wall of the sleeve and the annular outer wall of the crushing plate.

[0007] Furthermore, a circular array of sliders is provided on the inner wall of the lifting plate, and a T-shaped sliding groove matched with the sliders is provided on the outer wall of the lifting column.

[0008] Furthermore, the outer wall of the installation shell is evenly provided with air holes, and the top of the installation shell is provided with an exhaust fan, and the tops of the inner walls on the left and right sides of the installation slot are provided with heat dissipation holes.

[0009] Furthermore, a soil-breaking cone is provided at the bottom of the cutter shaft, and the length of the sleeve is greater than the sum of the lengths of the cutter shaft and the soil-breaking cone.

[0010] Furthermore, the specific steps of using an adjustable road surface breaking device and a method of using the device are as follows:

[0011] S1: When working, first connect the frame to the driving device through the traction device, and then drive the frame to move through the driving device;

[0012] S2: During crushing, the rotating motor drives the cutter shaft and the spiral blade to rotate, and the electric telescopic rod drives the drive plate to extend and retract to make the left end of the drive plate drop. At this time, the lifting column is pushed downward, and the lifting column drives the rotating cutter shaft to drop for crushing. Since the telescopic length of the electric telescopic rod is a fixed value, when the road surface needs to be crushed to different depths, the screw rod is rotated to drive the drive box to drop, and the initial position of the lifting column is changed, so that the depth of the lifting column can be adjusted;

[0013] S3: During the crushing process, the electric push rod is started to adjust the height of the lifting plate. The lifting of the lifting plate will change the height of the sleeve from the ground, and the inner diameter of the sleeve increases from top to bottom. Therefore, during the descent of the sleeve, the distance between the crushing plate and the inner wall of the sleeve ring will decrease, and the distance between the crushing teeth set on the opposite side of the sleeve and the crushing plate will also decrease. At this time, the motor drives the gear, outer gear ring, sleeve and crushing teeth to rotate (the rotating motor rotates in the opposite direction to the motor), and the two sets of crushing teeth are used to crush the stones to different degrees, and the stones are crushed into stones of different specifications.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] During crushing, the electric telescopic rod can be started to drive the driving plate to extend and retract so that the left end of the driving plate descends. At this time, the lifting column is pushed downward, and the lifting column drives the rotating knife shaft to descend for crushing. Since the telescopic length of the electric telescopic rod is a fixed value, when the road surface needs to be crushed to different depths, the screw rod can be rotated to drive the driving box to descend, and the initial position of the lifting column can be changed to adjust the depth of the lifting column descent;

[0016] During the crushing process, the electric push rod can be started to adjust the height of the lifting plate. The lifting of the lifting plate will change the height of the sleeve from the ground, and the inner diameter of the sleeve increases from top to bottom. Therefore, during the descent of the sleeve, the distance between the crushing plate and the inner wall of the sleeve ring will decrease, and the distance between the crushing teeth set on the opposite side of the sleeve and the crushing plate will also decrease. The rotating motor drives the two sets of crushing teeth in the opposite direction of the motor to crush the stones to different degrees, and the stones are crushed into stones of different specifications;

[0017] An exhaust fan is arranged in the inner cavity of the installation slot to speed up the air circulation speed in the inner cavity of the installation slot to dissipate heat for the rotating motor. A filter is arranged at the bottom of the orifice plate to prevent dust from entering the rotating motor. The orifice plate can prevent broken stones from splashing into the installation slot and causing damage to the rotating motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the connection between the lifting column and the fixing plate of the present invention;

[0020] Figure 3 This is a schematic diagram of the connection between the lifting column and the orifice plate of the present invention;

[0021] Figure 4 This is a top view of the lifting column of the present invention.

[0022] In the figure: 1. frame; 2. adjusting screw rod; 3. driving box; 4. electric telescopic rod; 5. driving plate; 6. rotating connecting piece; 7. slide groove; 8. lifting column; 9. limit plate; 10. crushing assembly; 11. slot; 12. traction piece; 13. fixing plate; 14. electric push rod; 15. lifting plate; 16. sleeve; 17. outer gear ring; 18. motor; 19. rotating rod; 20. gear; 21. crushing tooth; 22. crushing knife assembly; 23. mounting groove; 24. orifice plate; 25. mounting shell; 26. rotating motor; 27. knife shaft; 28. crushing plate; 29. ​​spiral blade; 30. exhaust fan; 31. heat dissipation hole; 32. slider. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The present invention provides a technical solution: an adjustable road surface breaking device, comprising a frame 1, see Figure 1A traction member 12 is provided on the right end face of the frame 1, an adjusting screw rod 2 is provided at the center of the top outer wall of the frame 1, grooves are provided on the inner walls on both sides of the frame 1, and a driving box 3 is slidably connected in the two sets of grooves, the bottom of the adjusting screw rod 2 extends to the inner cavity of the frame 1 and is connected to the top outer wall of the driving box 3 through a bearing, an electric telescopic rod 4 is provided on the right side of the top inner wall of the driving box 3, a rotating connecting piece 6 is provided in the middle of the bottom inner wall of the driving box 3, the driving plate 5 is adjusted by the lever principle to make the lifting column 8 rise and fall, a driving plate 5 is provided on the front end face of the rotating connecting piece 6, the bottom of the electric telescopic rod 4 extends to the bottom outer wall of the driving box 3 and is hinged to the right end of the driving plate 5, an active groove that cooperates with the movement of the driving plate 5 is provided on the right side of the bottom outer wall of the driving box 3, and a slide groove 7 is provided on the left side of the bottom outer wall of the driving plate 5. The top of the lowering column 8 should be installed with a slide bar that matches the slide groove 7, and the lifting column 8 must not be separated from the slide groove 7. A limit plate 9 is provided at the bottom of the left inner wall of the driving box 3 to limit the activity trajectory of the lifting column 8 so that it can only perform lifting activities. A lifting column 8 is movably inserted on the right side of the outer wall at the top of the limit plate 9. The top of the lifting column 8 is slidably connected with the slide groove 7. The bottom of the lifting column 8 extends to the bottom outer wall of the driving box 3 and a crushing component 10 is provided. The bottom outer wall of the frame 1 is provided with a slot 11 that matches the crushing component 10. Since the telescopic length of the electric telescopic rod 4 is a fixed value, when it is necessary to crush the road surface to different depths, the screw rod 2 can be rotated to drive the driving box 3 to descend, and the initial position of the lifting column 8 can be changed to adjust the depth of the descent of the lifting column 8.

[0025] See also Figure 2The crushing assembly 10 includes a fixed plate 13 fixedly sleeved on the outer wall of the lifting column 8, the fixed plate 13 is located on the outer wall of the bottom of the driving box 3, and electric push rods 14 are provided on the left and right sides of the outer wall of the bottom of the fixed plate 13. The bottoms of the two sets of electric push rods 14 are fixedly connected with a lifting plate 15, and the lifting plate 15 is slidably sleeved on the outer wall of the lifting column 8. During the crushing process, the electric push rods 14 can be started to adjust the height of the lifting plate 15. The lifting of the lifting plate 15 will change the height of the sleeve 16 from the ground, and the inner diameter of the sleeve 16 increases from top to bottom. Therefore, during the descent of the sleeve 16, the distance between the crushing plate 28 and the annular inner wall of the sleeve 16 will decrease, and the distance between the crushing teeth 21 arranged on the opposite side of the sleeve 16 and the crushing plate 28 will also decrease. An annular groove is provided at the bottom of the lifting plate 15, and the annular groove is located on the outer side of the lifting column 8. The annular groove A sleeve 16 is slidably connected inside, and an annular groove is provided at the top and bottom of the annular outer wall of the sleeve 16, and an outer gear ring 17 is clamped in the annular groove. A motor 18 is provided at the left end of the outer wall at the top of the lifting plate 15, and the motor 18 is located on the left side of the left electric push rod 14. A rotating rod 19 is provided at the bottom output end of the motor 18, and the bottom of the rotating rod 19 extends to the outer wall of the bottom of the lifting plate 15. The outer wall of the rotating rod 19 located at the bottom of the lifting plate 15 is provided with two sets of upper and lower gears 20, and the right end of the gear 20 is meshed with the left end of the outer gear ring 17. A crushing knife assembly 22 is provided at the bottom of the lifting column 8, and the motor 18 drives the gear 20, the outer gear ring 17, the sleeve 16 and the crushing teeth 21 to rotate (the rotating motor 26 rotates in the opposite direction to the motor 18), and the two sets of crushing teeth 21 are used to crush the stones to different degrees, and the stones are crushed into stones of different specifications;

[0026] See also Figure 3 The crushing knife assembly 22 includes a mounting groove 23 arranged at the bottom of the lifting column 8, a perforated plate 24 is arranged at the bottom of the mounting groove 23, the function of the perforated plate 24 is to prevent stones from splashing and damaging the rotating motor 26, a mounting shell 25 is arranged at the top of the perforated plate 24, a rotating motor 26 is arranged in the inner cavity of the mounting shell 25, a knife shaft 27 is arranged at the bottom output end of the rotating motor 26, the bottom of the knife shaft 27 extends to the outer wall of the bottom of the perforated plate 24, and the knife shaft 27 extends to the outer wall of the bottom part of the perforated plate 24, and a crushing plate 28 and a spiral blade 29 are sequentially installed from top to bottom, the rotating motor 26 rotates in the opposite direction to the motor 18, the spiral blade 29 descends to crush the ground, and the crushing plate 28 rotates in the opposite direction to the sleeve 16 to crush the gravel between the two groups of crushing teeth 21;

[0027] See also Figure 2-3The inner diameter of the sleeve 16 increases from top to bottom, the crushing plate 28 is truncated, and its top diameter is larger than the bottom diameter. Crushing teeth 21 are provided on the annular inner wall of the sleeve 16 and the annular outer wall of the crushing plate 28. According to the structural characteristics of the sleeve 16, during the crushing process, the electric push rod 14 can be started to adjust the height of the lifting plate 15. The lifting and lowering of the lifting plate 15 will change the height of the sleeve 16 from the ground. During the descent of the sleeve 16, the distance between the crushing plate 28 and the annular inner wall of the sleeve 16 will decrease, and the distance between the crushing teeth 21 provided on the opposite side of the sleeve 16 and the crushing plate 28 will also decrease, so as to realize different degrees of crushing of stones.

[0028] See also Figure 4 The lifting plate 15 is provided with a slider 32 in an annular array on the inner wall thereof, and the outer wall of the lifting column 8 is provided with a T-shaped slideway matched with the slider 32 to maintain the stability of the lifting plate 15 and prevent the lifting plate 15 from rotating under force and affecting the crushing effect;

[0029] See also Figure 3 The outer wall of the installation shell 25 is evenly provided with air holes, and an exhaust fan 30 is provided on the top of the installation shell 25. The tops of the inner walls on both sides of the installation slot 23 are provided with heat dissipation holes 31. The exhaust fan 30 accelerates the air circulation speed in the inner cavity of the installation slot 23 to dissipate heat for the rotating motor 26. A filter screen should be provided at the bottom of the orifice plate 24 to prevent dust from entering the rotating motor 26.

[0030] See also Figure 2 A soil-breaking cone is provided at the bottom of the cutter shaft 27, and the length of the sleeve 16 is greater than the sum of the lengths of the cutter shaft 27 and the soil-breaking cone. When not in use, the cutter shaft 27 can be completely retracted into the inner side of the sleeve 16 to protect the cutter shaft 27 and the spiral blade 29.

[0031] An adjustable road surface breaking device and a method of using the same, the steps of the method of using the same are as follows:

[0032] S1: When working, firstly, the frame 1 is connected to the driving device through the traction member 12, and the frame 1 is driven to move by the driving device;

[0033] S2: During crushing, the rotating motor 26 drives the cutter shaft 27 and the spiral blade 29 to rotate, and the electric telescopic rod 4 drives the driving plate 5 to extend and retract so that the left end of the driving plate 5 descends. At this time, the lifting column 8 is pushed downward, and the lifting column 8 drives the rotating cutter shaft 27 to descend for crushing. Since the telescopic length of the electric telescopic rod 4 is a fixed value, when the road surface needs to be crushed to different depths, the screw rod 2 is rotated to drive the driving box 3 to descend, and the initial position of the lifting column 8 is changed, so that the depth of the descent of the lifting column 8 can be adjusted;

[0034] S3: During the crushing process, the electric push rod 14 is started to adjust the height of the lifting plate 15. The lifting and lowering of the lifting plate 15 will change the height of the sleeve 16 from the ground, and the inner diameter of the sleeve 16 increases from top to bottom. Therefore, during the descent of the sleeve 16, the distance between the crushing plate 28 and the inner wall of the sleeve 16 will decrease, and the distance between the crushing teeth 21 arranged on the opposite side of the sleeve 16 and the crushing plate 28 will also decrease. At this time, the motor 18 drives the gear 20, the outer gear ring 17, the sleeve 16 and the crushing teeth 21 to rotate (the rotating motor 26 rotates in the opposite direction to the motor 18), and the two groups of crushing teeth 21 are used to crush the stones to different degrees, and the stones are crushed into stones of different specifications.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable road surface breaking device, comprising a frame (1), wherein a traction member (12) is provided on the right end surface of the frame (1), and characterized in that: An adjusting screw rod (2) is provided at the center of the top outer wall of the frame (1); grooves are provided on the inner walls on the left and right sides of the frame (1); and a drive box (3) is slidably connected in the two sets of grooves; the bottom of the adjusting screw rod (2) extends to the inner cavity of the frame (1) and is connected to the top outer wall of the drive box (3) through a bearing; an electric telescopic rod (4) is provided on the right side of the top inner wall of the drive box (3); a rotating connecting piece (6) is provided in the middle of the bottom inner wall of the drive box (3); a drive plate (5) is provided on the front end surface of the rotating connecting piece (6); the bottom of the electric telescopic rod (4) extends to the bottom outer wall of the drive box (3) and is hinged to the right end of the drive plate (5); and the right side of the bottom outer wall of the drive box (3) is provided with a rotating connecting piece (6) that cooperates with the movement of the drive plate (5). A movable groove is formed on the left side of the bottom outer wall of the driving plate (5), a sliding groove (7) is provided on the bottom of the left inner wall of the driving box (3), a limiting plate (9) is provided on the bottom of the outer wall of the top of the limiting plate (9), a lifting column (8) is movably inserted on the right side of the top outer wall of the limiting plate (9), the top of the lifting column (8) is slidably connected to the sliding groove (7), the bottom of the lifting column (8) extends to the bottom outer wall of the driving box (3) and is provided with a crushing assembly (10), the bottom outer wall of the frame (1) is provided with a slot (11) matching the crushing assembly (10), the crushing assembly (10) comprises a fixing plate (13) fixedly sleeved on the outer wall of the lifting column (8), the fixing plate (13) is located on the bottom outer wall of the driving box (3), and the bottom outer wall of the fixing plate (13) is on both sides. An electric push rod (14) is provided, and a lifting plate (15) is fixedly connected to the bottom of two groups of the electric push rods (14). The lifting plate (15) is slidably sleeved on the outer wall of the lifting column (8). An annular groove is provided at the bottom of the lifting plate (15), and the annular groove is located outside the lifting column (8). A sleeve (16) is slidably connected in the annular groove. The sleeve (16) is provided with annular grooves at the top and bottom of the annular outer wall, and an outer gear ring (17) is clamped in the annular groove. A motor (18) is provided at the left end of the top outer wall of the lifting plate (15), and the motor (18) is located on the left side of the left electric push rod (14). A rotating rod (19) is provided at the bottom output end of the motor (18), and the bottom of the rotating rod (19) extends to the outer wall of the bottom of the lifting plate (15); the outer wall of the rotating rod (19) located at the bottom of the lifting plate (15) is provided with two sets of upper and lower gears (20); the right end of the gear (20) is meshed with the left end of the outer gear ring (17); the bottom of the lifting column (8) is provided with a crushing knife assembly (22); the crushing knife assembly (22) comprises a mounting groove (23) arranged at the bottom of the lifting column (8); the bottom of the mounting groove (23) is provided with a perforated plate (24); the top of the perforated plate (24) is provided with a mounting shell (25); the inner cavity of the mounting shell (25) is provided with a rotating motor (26); the bottom output end of the rotating motor (26) is provided with a knife shaft (27); the bottom of the knife shaft (27) extends to the outer wall of the bottom of the perforated plate (24);The outer wall of the knife shaft (27) extending to the bottom of the orifice plate (24) is provided with a crushing plate (28) and a spiral blade (29) from top to bottom. The inner diameter of the sleeve (16) increases from top to bottom. The crushing plate (28) is truncated and has a top diameter greater than a bottom diameter. The annular inner wall of the sleeve (16) and the annular outer wall of the crushing plate (28) are both provided with crushing teeth (21). The two groups of crushing teeth 21 crush the stones to different degrees, and the stones are crushed into stones of different specifications. The annular inner wall of the lifting plate (15) is provided with a slider (32) in an annular array, and the outer wall of the lifting column (8) is provided with a T-shaped slide groove matched with the slider (32).

2. The adjustable road surface breaking device according to claim 1, characterized in that: The outer wall of the installation shell (25) is evenly provided with air holes, and the top of the installation shell (25) is provided with an exhaust fan (30), and the tops of the inner walls on both sides of the installation slot (23) are provided with heat dissipation holes (31).

3. The adjustable road surface breaking device according to claim 1, characterized in that: A soil breaking cone is provided at the bottom of the cutter shaft (27), and the length of the sleeve (16) is greater than the sum of the lengths of the cutter shaft (27) and the soil breaking cone.

4. The method for using the adjustable road surface breaking device according to claim 1, characterized in that: The steps for using this method are as follows: S1: When working, firstly, the frame (1) is connected to the driving device via the traction member (12), and the frame (1) is driven to move via the driving device; S2: During crushing, the rotating motor (26) drives the blade shaft (27) and the spiral blade (29) to rotate, and the electric telescopic rod (4) drives the driving plate (5) to extend and retract so that the left end of the driving plate (5) descends. At this time, the lifting column (8) is pushed downward, and the lifting column 8 drives the rotating blade shaft (27) to descend to crush. Since the telescopic length of the electric telescopic rod (4) is a fixed value, when it is necessary to crush the road surface to different depths, the adjusting screw rod (2) is rotated to drive the driving box (3) to descend, and the initial position of the lifting column (8) is changed, so that the depth of descent of the lifting column (8) can be adjusted; S3: During the crushing process, the electric push rod (14) is started to adjust the height of the lifting plate (15). The lifting of the lifting plate (15) will change the height of the sleeve (16) from the ground, and the inner diameter of the sleeve (16) increases from top to bottom. Therefore, during the descent of the sleeve (16), the distance between the crushing plate (28) and the inner wall of the sleeve (16) will decrease, and the distance between the crushing teeth (21) arranged on the opposite side of the sleeve (16) and the crushing plate (28) will also decrease. At this time, the motor (18) drives the gear (20), the outer gear ring (17), the sleeve (16) and the crushing teeth (21) to rotate. The rotating motor (26) rotates in the opposite direction to the motor (18). The two sets of crushing teeth (21) crush the stones to different degrees, and the stones are crushed into stones of different specifications.

Images