System and method for producing iron-rich low-silicon composite binder for iron ore pellets

Abstract

The invention relates to the technical field of binder production, and discloses a system and method for producing an iron-rich low-silicon composite binder for iron ore pellets, the system comprises a support frame, a dryer and a mixer are fixedly mounted at the top of the support frame, the mixer is located below the dryer, the top of the mixer is fixedly communicated with discharge ports of three bins, and the discharge ports of the three bins are communicated with the dryer; a material discharge port of the dryer is located at a feed port of the corresponding stock bin; a lower end opening of the mixing machine is formed in a feeding opening in the top of the first-stage grinding shell, a discharging opening in the bottom end of the first-stage grinding shell is fixedly communicated with the top of the second-stage grinding shell, and the side wall of the second-stage grinding shell is fixedly connected with the supporting frame. According to the system and method for producing the iron-rich low-silicon composite binder for the iron ore pellets, in the using process of the device, materials are finely ground through two stages of grinding mechanisms, and the materials can be efficiently ground through multiple grinding faces in different movement directions when the device operates.

Description

Technical Field

[0001] The invention relates to the technical field of binder production, and in particular to a system and method for producing an iron-rich, low-silicon composite binder for iron ore pellets. Background Art

[0002] Iron ore pellets iron-rich low-silicon composite binder is a material used in the preparation of iron ore pellets. The binder can improve the tuberculosis rate and structural strength of iron ore pellets. In the binder production process, the dried iron-rich raw materials and various materials need to be fully mixed, and then the mixed materials are ground and crushed by grinding equipment to obtain fine granular finished materials. However, the existing composite binder production system still has some problems: For example, a grinding device and grinding method for chemical raw materials with the announcement number CN115007282B is disclosed, wherein the grinding device comprises a grinding barrel, a reciprocating grinding mechanism, a sieve plate and a material return mechanism; the grinding barrel is arranged horizontally, and a grinding chamber is formed therein, and a feed inlet, a material return inlet and a material discharge inlet are respectively provided on the side walls of the grinding barrel, and a grinding shoe is provided at the lower part of the grinding chamber; the reciprocating grinding mechanism is installed at the central position of the grinding chamber and has a reciprocating grinding part and a push block; A chemical raw material grinding device with the announcement number CN112958249B comprises a stabilizing support plate, a limiting outer frame is fixedly connected to the middle position of the top of the stabilizing support plate, a grinding inner groove is fixedly connected to the surface of the inner part of the limiting outer frame through a supporting spring plate, a grinding convex ball is fixedly connected to the middle position of the bottom end of the inner part of the limiting outer frame, and a grinding block is penetrated and rotatably connected to the top of the grinding convex ball; During use of the above device, the device only contacts and grinds the material through two grinding surfaces, and the grinding efficiency of the device is not high.

[0003] In view of the above problems, it is urgent to carry out innovative design based on the original composite adhesive production system. Summary of the invention

[0004] The purpose of the present invention is to provide a system and method for producing an iron-rich, low-silicon composite binder for iron ore pellets, so as to solve the following problems in the existing composite binder production system proposed in the above background technology: during the use of the device, the material is contact-ground only through two grinding surfaces, and the grinding efficiency of the device is not high.

[0005] To achieve the above object, the present invention provides the following technical solution: a system for producing an iron-rich, low-silicon composite binder for iron ore pellets, comprising: A support frame, on the top of which a dryer and a mixer are fixedly installed, the mixer is located below the dryer, and the top of the mixer is fixedly connected to the discharge ports of three silos, and the material discharge ports of the dryer are located at the feed ports of the corresponding silos; Also includes: A primary grinding shell, wherein the lower port of the mixer is arranged at the feed inlet at the top thereof, the bottom discharge port of the primary grinding shell is fixedly connected to the top of the secondary grinding shell, and the side wall of the secondary grinding shell is fixedly connected to the support frame, a servo motor is coaxially fixedly installed on the top of the primary grinding shell, and a guide ring fixedly connected to the inner wall of the primary grinding shell is arranged directly below the servo motor, a grinding column is coaxially fitted on the inner wall of the guide ring, and a cross column and a transmission rod are inserted and slidably penetrated in sequence from top to bottom at the axis of the grinding column, the top of the transmission rod is coaxially fixedly connected to the bottom end of the cross column, and the top of the cross column is coaxially fixedly installed on the output shaft of the servo motor, the grinding column is coaxially arranged on the inner side of the primary grinding shell, and the bottom end of the grinding column passes through the discharge port of the primary grinding shell, and a filter arc plate is arranged directly below the bottom end of the grinding column, and the filter arc plate is rotatably fitted on the inner wall of the secondary grinding shell; The loading plate is symmetrically distributed obliquely below the filter arc plate, the loading plate is rotatably embedded in the inner wall of the secondary grinding shell, and the two ends of the positioning shaft are fixedly connected between the loading plates, and the positioning shaft is rotatably installed through the bottom end of the lower grinding plate, and the two ends of the lower grinding plate are slidably inserted in the mounting groove of the corresponding loading plate, a material channel is opened inside the secondary grinding shell, and the upper end of the material channel is arranged toward the lower end of the filter arc plate, and the lower end of the material channel is arranged toward the top of the lower grinding plate, and an upper grinding plate is arranged above the lower grinding plate, and the upper grinding plate The lower grinding plate is inclined and arranged, and the upper grinding plate is fixedly connected to the inner wall of the secondary grinding shell, and a grinding enhancement mechanism is slidably installed on the lower grinding plate, and the grinding enhancement mechanism includes an arc plate, and the arc plate slides through and fits in the sliding groove of the lower grinding plate, and three arc plates are arranged on the lower grinding plate, and the arc plate rotates and fits through the closing plate, and the closing plate is fitted on the outer wall of the lower grinding plate, and the top end of the lower grinding plate is fixedly connected to a limiting frame, and the limiting frame slides through and fits the top end of the closing plate to form a sliding guide structure.

[0006] Preferably, a guide rod is fixedly installed on the top side wall of the grinding column, and the end of the guide rod is fitted between the protrusions on the inner wall of the guide ring, and auxiliary pressure plates with equal angles are rotatably fitted and embedded on the side wall of the grinding column, and the outer wall of the auxiliary pressure plate is flush with the side wall of the grinding column, the bottom end surface of the auxiliary pressure plate is an arc-shaped structure, and a cross bar on the grinding column is rotatably installed through the top of the auxiliary pressure plate, so that the auxiliary pressure plate can rotate on the grinding column.

[0007] Preferably, protrusions at both ends of the sliding rod are slidably installed on the inner wall of the auxiliary pressure plate, and one end of the push plate is rotatably connected to the sliding rod, and the transverse axis of the other end of the push plate is rotatably fitted in a limiting groove opened on the cross column, and the push plate is slidably embedded in the inner wall of the grinding column, and the limiting groove has a wavy structure, and a baffle with a blocking function is fitted on the side wall of the bottom end of the grinding column, and the baffles are symmetrically distributed at the discharge port of the primary grinding shell, and the outer wall of the baffle is fixedly connected to the moving end of the electric cylinder, and the electric cylinder is fixedly installed on the outer wall of the primary grinding shell, so that the push plate can drive the auxiliary pressure plate to rotate through the sliding rod.

[0008] Preferably, a gear ring is coaxially fixedly installed on the lower end of the transmission rod, and a transmission gear is meshingly provided on the side of the gear ring, and the transmission gear and the gear ring are rotatably embedded in the inner wall of the primary grinding shell, a cam is fixedly connected to the bottom of the rotating shaft of the transmission gear, and the distal end of the cam is fitted on the inner wall of the moving frame, the moving frame is slidably installed on the inner wall of the secondary grinding shell, and the top of the moving frame is fixedly connected to the bottom surface of the moving frame, and the moving frame is slidably fitted on the inner wall of the secondary grinding shell, so that the transmission gear can drive the moving frame to move through the cam.

[0009] Preferably, the filter arc plate is arranged at an angle, and a connecting shaft of a swing gear is coaxially fixedly installed on the outer wall of the upper end of the filter arc plate, and the swing gear is rotatably embedded in the inner wall of the secondary grinding shell, and a tooth plate is meshingly arranged below the swing gear, and the tooth plate is slidably embedded in the inner wall of the secondary grinding shell, and the tooth plate is fixedly installed on the outer wall of the mobile frame, an auxiliary scraper is fitted on the bottom surface of the filter arc plate, and the bottom of the auxiliary scraper is elastically connected to the top groove of the side discharge rack through a spring, and the bottom of the side discharge rack is fixedly connected to the inner wall of the secondary grinding shell, so that the tooth plate can drive the filter arc plate to swing through the swing gear.

[0010] Preferably, a force-bearing rod is fixedly connected to the outer wall of the top end of the closing plate, and the force-bearing rod is slidably fitted and installed in the guide groove of the limit frame, the outer wall of the limit frame is fitted on the fixed frame, and three guide grooves are opened on the outer wall of the fixed frame, and the inner wall protrusions of adjacent guide grooves are in opposite directions, and the force-bearing rod is fitted on the inner side of the guide groove, the two ends of the fixed frame are fixedly installed and connected to the corresponding loading disk, and the axis of the fixed frame intersects with the axis of the loading disk at right angles, and the two ends of the upper grinding plate are fitted between the loading disks, so that the force-bearing rod can move in the guide groove on the fixed frame.

[0011] Preferably, a cross bar at the top of the inner frame is fitted in the through groove at the bottom of the arc-shaped plate, and the bottom side wall of the inner frame is slidably inserted into the inner side of the outer cylinder, and a return spring is fixedly connected between the bottom surface of the inner frame and the inner wall of the outer cylinder, the top end of the outer cylinder is fixedly connected to the bottom outer wall of the lower grinding plate, and the inner frame can move in the outer cylinder.

[0012] Preferably, the bottom of the lower grinding plate is rotatably connected to the upper end of the thrust frame on one side away from the upper grinding plate, and the lower end of the thrust frame is rotatably connected to the top of the sliding block, the bottom of the sliding block is slidably installed on the top of the lifting platform, the lower end of the lower grinding plate faces the discharge port of the secondary grinding shell, and an arc-shaped plug plate is fixedly connected to the top outer wall of the lower grinding plate, and the center of the plug plate is on the axis of the positioning shaft, and the bottom of the plug plate is rotatably inserted in the slot of the movable frame, so that the sliding block can drive the lower grinding plate to rotate through the thrust frame.

[0013] Preferably, the guide columns on both sides of the lifting platform slide through the guide columns on which the bottom of the movable frame is installed, and the side walls of the lifting platform are fitted on the outer walls of the vertical plates, and the bottom of the vertical plates are fixedly connected to the inner wall of the secondary grinding shell, and a convex shaft is fitted inside the wave groove of the vertical plates, and one end of the convex shaft away from the vertical plate is vertically fixedly connected to the side wall of the lifting platform, so that the convex shaft can drive the lifting platform to move.

[0014] The method for producing an iron-rich and low-silicon composite binder system for iron ore pellets comprises the following steps: S1: The user feeds the raw materials into the dryer for drying. The dried raw materials fall into the corresponding silos, while the other two silos store the corresponding auxiliary materials. The user then controls the corresponding silos to discharge the materials. The raw materials and auxiliary materials fall into the mixer for mixing. The mixer then discharges the composite materials into the primary grinding shell. S2: The device controls the servo motor to start synchronously. At this time, the output shaft of the servo motor will drive the cross column to rotate synchronously, and the cross column will drive the grinding column and the transmission rod to rotate synchronously. The guide rod on the top of the grinding column will move along the protrusion in the guide ring. The guide rod will drive the rotating grinding column to move up and down synchronously, so that the grinding column can further crush and reset the material while rotating and grinding the composite material, and the moving grinding column will drive the push plate to move synchronously along the limit groove. At this time, the push plate can move back and forth. The push plate will push the auxiliary pressure plate to move synchronously through the sliding rod, so that the auxiliary pressure plate can swing back and forth around the horizontal axis at the top of the grinding column, and the auxiliary pressure plate protruding from the grinding column can further press the composite material to the inner wall of the primary grinding shell for re-grinding; S3: During this process, the device controls the electric cylinder to start intermittently, so that the electric cylinder can pull the baffle to move, so that the baffle can intermittently open the discharge port at the bottom of the primary grinding shell, thereby increasing the grinding time. After that, the reset material in the primary grinding shell will fall into the filter arc plate, and the previously rotating transmission rod will drive the gear ring to rotate synchronously, and the gear ring will drive the transmission gear to rotate synchronously, and the transmission gear will drive the cam coaxially installed at the bottom to rotate synchronously, and the cam will drive the motion frame to perform a reset motion, and the motion frame will drive the moving frame installed at the bottom to move synchronously. At this time, the moving frame will drive the tooth plate to move synchronously, and the tooth plate will drive the swing gear to rotate, so that the swing gear will drive the filter arc plate to swing back and forth, and the material with qualified particle diameter filtered by the filter arc plate will be discharged through the side discharge rack, and the remaining material with too large particle diameter will fall between the lower grinding plate and the upper grinding plate through the material channel; S4: The moving moving frame will drive the lifting platform installed at the bottom to move synchronously, so that the convex shaft on the lifting platform can move along the wave groove on the vertical plate. At this time, the lifting platform will reciprocate in the vertical direction. During this process, the lifting platform will drive the lower grinding plate to move synchronously through the sliding block and the thrust frame, so that the lower grinding plate can swing back and forth around the positioning axis. The lower grinding plate will drive the loading plates at both ends to rotate synchronously, and the material will be squeezed to the upper grinding plate through the lower grinding plate to improve the material crushing effect. When the lower grinding plate presses the upper grinding plate, the arc plate will be forced to rotate on the closing plate, so that the arc plate can exert pressure on the inner frame, so that the inner frame will move into the outer cylinder, and the return spring is compressed by the inner frame at the same time; S5: The movable frame can push the lower grinding plate to move horizontally back and forth through the plug plate, and the lower grinding plate will slide in the slot of the loading plate, and the lower end of the lower grinding plate will slide along the positioning axis, so that the lower grinding plate and the upper grinding plate can further grind the material. At the same time, the lower grinding plate will drive the closing plate and the limit frame to move synchronously, and the force-bearing rod on the top of the closing plate will move along the guide groove on the fixed frame. At this time, the force-bearing rod will drive the corresponding closing plate and the arc plate to move synchronously. Since the inner walls of adjacent guide grooves bulge in opposite directions, the movement directions of adjacent force-bearing rods are also synchronously opposite. Therefore, when the arc plate in the middle slides downward, the arc plates on both sides will slide upward, and the material between the lower grinding plate and the upper grinding plate is further ground by utilizing the staggered sliding of the three arc plates, thereby effectively increasing the grinding area.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the system and method for producing an iron-rich, low-silicon composite binder for iron ore pellets, during the use of the device, the material is finely ground through a two-stage grinding mechanism, and the material can be efficiently ground through grinding surfaces in multiple different moving directions during the operation of the device. The specific contents are as follows: The guide rod is fixedly installed on the top side wall of the grinding column, and the end of the guide rod is fitted between the protrusions on the inner wall of the guide ring. A secondary pressure plate distributed at equal angles is rotatably fitted on the side wall of the grinding column, and the outer wall of the secondary pressure plate is flush with the side wall of the grinding column. The bottom end surface of the secondary pressure plate is an arc-shaped structure, and the top of the secondary pressure plate is rotated through a cross bar installed on the grinding column, and protrusions at both ends of the sliding rod are slidably installed on the inner wall of the secondary pressure plate. One end of the push plate is rotatably connected to the sliding rod, and the transverse axis of the other end of the push plate is rotatably fitted in a limiting groove opened on the cross column, and the push plate is slidably embedded in the inner wall of the grinding column, and the limiting groove is a wavy structure. When the grinding column rotates, the guide rod can move along the protrusion on the inner side of the guide ring. In this process, the guide rod can drive the grinding column to move up and down synchronously, so that the grinding column vibrates the material while rotating, and at the same time, the grinding column will drive the push plate to move along the limiting groove on the cross column. At this time, the push plate will drive the secondary pressure plate to swing back and forth synchronously to crush the material; 2. The arc plate slides through and fits in the sliding groove of the lower grinding plate, and three arc plates are arranged on the lower grinding plate. The top of the lower grinding plate is fixedly connected to the limiting frame, and the limiting frame slides through and through the top of the closing plate to form a sliding guide structure. A force rod is fixedly connected to the top outer wall of the closing plate, and the force rod slides and fits through and is installed in the guide groove of the limiting frame. The outer wall of the limiting frame is fit-fitted on the fixed frame, and three guide grooves are opened on the outer wall of the fixed frame. The inner walls of adjacent guide grooves bulge in opposite directions, and the inner sides of the guide grooves are fit-fitted with force rods. Both ends of the fixed frame are fixedly installed and connected to the corresponding loading disc. When the lower grinding plate drives the limiting frame to move horizontally reciprocatingly, the limiting frame will drive the closing plate and the force rod to move synchronously, so that the force rod can slide along the guide groove. At this time, the closing plate will drive the corresponding arc plate to move synchronously, and the moving directions of the two adjacent arc plates are opposite. The three arc plates are used to further increase the grinding area of ​​the device for the material, thereby improving the grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall external structure of the present invention; Figure 2 This is a schematic diagram of the installation structure of the primary grinding shell of the present invention; Figure 3 This is a schematic diagram of the grinding column installation structure of the present invention; Figure 4 This is a schematic diagram of the installation structure of the side discharge rack of the present invention; Figure 5 This is a schematic diagram of the guide rod installation structure of the present invention; Figure 6 This is a schematic diagram of the cross column installation structure of the present invention; Figure 7 This is a schematic diagram of the installation structure of the filter arc plate of the present invention; Figure 8This is a schematic diagram of the swing gear transmission structure of the present invention; Fig. 9 This is a schematic diagram of the installation structure of the loading tray of the present invention; Fig.10 This is a schematic diagram of the installation structure of the lower grinding plate of the present invention; Fig.11 This is a schematic diagram of the positioning shaft installation structure of the present invention; Fig.12 This is a schematic diagram of the installation structure of the closing plate of the present invention; Fig.13 It is a schematic diagram of the installation structure of the stress rod of the present invention; Fig.14 This is a schematic diagram of the thrust frame installation structure of the present invention; Fig.15 This is a schematic diagram of the installation structure of the lifting platform of the present invention; Fig.16 The figure is a schematic diagram of the working process of the composite adhesive production system of the present invention.

[0017] In the figure: 1, support frame; 2, dryer; 3, silo; 4, mixer; 5, primary grinding shell; 6, secondary grinding shell; 7, servo motor; 8, guide ring; 9, grinding column; 10, auxiliary pressure plate; 11, guide rod; 12, cross column; 13, limit groove; 14, push plate; 15, sliding rod; 16, transmission rod; 17, baffle; 18, electric cylinder; 19, gear ring; 20, transmission gear; 21, cam; 22, motion frame; 23, mobile frame; 24, gear plate; 25, swing gear; 26, filter arc plate; 27. Side discharge rack; 28. Auxiliary scraper; 29. ​​Material channel; 30. Lower grinding plate; 31. Loading plate; 32. Grinding enhancement mechanism; 3201. Arc plate; 3202. Closing plate; 3203. Limiting rack; 3204. Force rod; 3205. Inner frame; 3206. Outer cylinder; 3207. Return spring; 33. Positioning shaft; 34. Upper grinding plate; 35. Fixed frame; 36. Guide groove; 37. Thrust frame; 38. Sliding block; 39. Lifting platform; 40. Cam shaft; 41. Vertical plate; 42. Insert plate. DETAILED DESCRIPTION

[0018] 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.

[0019] See also Figure 1-Figure 16 The present invention provides a technical solution: a production system of an iron-rich and low-silicon composite binder for iron ore pellets, comprising: A support frame 1, on the top of which a dryer 2 and a mixer 4 are fixedly installed, the mixer 4 is located below the dryer 2, and the top of the mixer 4 is fixedly connected to the discharge ports of three silos 3, and the material discharge ports of the dryer 2 are located at the corresponding feed ports of the silos 3; Also includes: A primary grinding shell 5, the feed inlet of which is provided at the top with the lower port of the mixer 4, the bottom discharge port of the primary grinding shell 5 is fixedly connected to the top of the secondary grinding shell 6, and the side wall of the secondary grinding shell 6 is fixedly connected to the support frame 1, a servo motor 7 is coaxially fixedly installed on the top of the primary grinding shell 5, and a guide ring 8 fixedly connected to the inner wall of the primary grinding shell 5 is provided directly below the servo motor 7, a grinding column 9 is coaxially fitted on the inner wall of the guide ring 8, and a cross column 12 and a transmission rod 16 are inserted and slidably penetrated in sequence from top to bottom at the axis of the grinding column 9, the top of the transmission rod 16 is coaxially fixedly connected to the bottom end of the cross column 12, and the top of the cross column 12 is coaxially fixedly installed on the output shaft of the servo motor 7, the grinding column 9 is coaxially arranged on the inner side of the primary grinding shell 5, and the bottom end of the grinding column 9 passes through the discharge port of the primary grinding shell 5, and a filter arc plate 26 is provided directly below the bottom end of the grinding column 9, and the filter arc plate 26 is rotatably fitted on the inner wall of the secondary grinding shell 6; The loading plate 31 is symmetrically distributed obliquely below the filter arc plate 26. The loading plate 31 is rotatably embedded in the inner wall of the secondary grinding shell 6, and the two ends of the positioning shaft 33 are fixedly connected between the loading plates 31, and the positioning shaft 33 is rotatably installed on the bottom end of the lower grinding plate 30, and the two ends of the lower grinding plate 30 are slidably inserted in the mounting grooves corresponding to the loading plate 31. The interior of the secondary grinding shell 6 is provided with a material channel 29, and the upper end of the material channel 29 is arranged toward the lower end of the filter arc plate 26, and the lower end of the material channel 29 is arranged toward the top of the lower grinding plate 30. An upper grinding plate 34 is arranged above the lower grinding plate 30, and the upper grinding plate 34 and the lower grinding plate 30 are inclined. It is obliquely arranged, and the upper grinding plate 34 is fixedly connected to the inner wall of the secondary grinding shell 6. A grinding enhancement mechanism 32 is slidably installed on the lower grinding plate 30. The grinding enhancement mechanism 32 includes an arc plate 3201. The arc plate 3201 slides through and is fitted in the sliding groove of the lower grinding plate 30. Three arc plates 3201 are arranged on the lower grinding plate 30. The arc plate 3201 rotates and fits through the closing plate 3202, and the closing plate 3202 is fitted on the outer wall of the lower grinding plate 30. The top end of the lower grinding plate 30 is fixedly connected to the limiting frame 3203, and the top end of the closing plate 3202 is slidably installed on the limiting frame 3203 to form a sliding guide structure.

[0020] A gear ring 19 is coaxially fixedly installed at the lower end of the transmission rod 16, and a transmission gear 20 is meshedly arranged on the side of the gear ring 19, and the transmission gear 20 and the gear ring 19 are rotatably embedded in the inner wall of the primary grinding shell 5, and a cam 21 is fixedly connected to the bottom of the rotating shaft of the transmission gear 20, and the distal end of the cam 21 is fitted on the inner wall of the moving frame 22, and the moving frame 22 is slidably installed on the inner wall of the secondary grinding shell 6, and the top of the moving frame 23 is fixedly connected to the bottom surface of the moving frame 22, and the moving frame 23 is slidably fitted on the inner wall of the secondary grinding shell 6, so that the transmission rod 16 can drive the transmission gear 20 and the cam 21 to rotate through the gear ring 19, and at this time, the cam 21 will drive the moving frame 22 to reciprocate synchronously, and the moving frame 22 will drive the moving frame 23 to move synchronously, The filter arc plate 26 is inclined, and the connecting shaft of the swing gear 25 is coaxially fixed on the outer wall of the upper end of the filter arc plate 26, and the swing gear 25 is rotatably embedded in the inner wall of the secondary grinding shell 6, and a tooth plate 24 is meshed below the swing gear 25, and the tooth plate 24 is slidably embedded in the inner wall of the secondary grinding shell 6, and the tooth plate 24 is fixedly installed on the outer wall of the moving frame 23, and an auxiliary scraper 28 is fitted on the bottom surface of the filter arc plate 26, and the bottom of the auxiliary scraper 28 is elastically connected to the top groove of the side discharge frame 27 through a spring, and the bottom of the side discharge frame 27 is fixedly connected to the inner wall of the secondary grinding shell 6, at this time, the moving frame 23 will drive the swing gear 25 to rotate reciprocatingly through the tooth plate 24, and the swing gear 25 will drive the filter arc plate 26 to swing synchronously reciprocatingly.

[0021] A guide rod 11 is fixedly installed on the top side wall of the grinding column 9, and the end of the guide rod 11 is fitted between the protrusions on the inner wall of the guide ring 8. Auxiliary pressure plates 10 with equal angles are rotatably fitted and embedded on the side wall of the grinding column 9, and the outer wall of the auxiliary pressure plate 10 is flush with the side wall of the grinding column 9. The bottom end surface of the auxiliary pressure plate 10 is an arc-shaped structure, and the cross bar on the grinding column 9 is rotatably installed on the top of the auxiliary pressure plate 10. When the grinding column 9 rotates, the guide rod 11 will move along the protrusions on the inner wall of the guide ring 8, so that the guide rod 11 can drive the grinding column 9 to move up and down reciprocatingly. Since the protrusions at both ends of the sliding rod 15 are slidably installed on the inner wall of the auxiliary pressure plate 10, and the sliding rod 1 5 is rotatably connected to one end of a push plate 14, and the transverse axis rotation of the other end of the push plate 14 is fitted in a limiting groove 13 provided on the cross column 12, and the push plate 14 is slidably embedded in the inner wall of the grinding column 9, and the limiting groove 13 is a wavy structure. A baffle 17 with a blocking function is fitted on the side wall of the bottom end of the grinding column 9, and the baffles 17 are symmetrically distributed at the discharge port of the primary grinding shell 5, and the outer walls of the baffles 17 are fixedly connected to the moving ends of the electric cylinders 18, and the electric cylinders 18 are fixedly installed on the outer wall of the primary grinding shell 5. At this time, the grinding column 9 will drive the push plate 14 to move synchronously along the limiting groove 13, and at this time, the push plate 14 can drive the auxiliary pressure plate 10 to swing back and forth synchronously.

[0022] The bottom of the lower grinding plate 30 is rotatably connected to the upper end of the thrust frame 37 on one side away from the upper grinding plate 34, and the lower end of the thrust frame 37 is rotatably connected to the top of the sliding block 38, and the bottom of the sliding block 38 is slidably installed on the top of the lifting platform 39, and the lower end of the lower grinding plate 30 faces the discharge port of the secondary grinding shell 6, and an arc-shaped plug plate 42 is fixedly connected to the top outer wall of the lower grinding plate 30, and the center of the plug plate 42 is on the axis of the positioning shaft 33, and the bottom of the plug plate 42 is rotatably inserted in the slot of the moving frame 23, so that the moving frame 23 can drive the lower grinding plate 30 to move horizontally synchronously through the plug plate 42, and the guide columns on the bottom end of the moving frame 23 are installed on both sides of the lifting platform 39, and the side walls of the lifting platform 39 are fitted on the outer wall of the vertical plate 41, and the bottom of the vertical plate 41 is fixedly connected to the inner wall of the secondary grinding shell 6, and the convex shaft 40 is fitted inside the wave groove of the vertical plate 41, and the convex shaft 40 The end away from the vertical plate 41 is vertically fixed to the side wall of the lifting platform 39. At this time, the moving frame 23 will drive the convex shaft 40 on the side wall of the lifting platform 39 to move along the wave groove on the vertical plate 41, so that the lifting platform 39 can move up and down. The lifting platform 39 will drive the lower grinding plate 30 to move synchronously through the sliding block 38 and the thrust frame 37, so that the lower grinding plate 30 can press the upper grinding plate 34. The cross bar at the top of the inner frame 3205, and the bottom side wall of the inner frame 3205 are slidably inserted into the inner side of the outer cylinder 3206, and a return spring 3207 is fixedly connected between the bottom surface of the inner frame 3205 and the inner wall of the outer cylinder 3206, and the top of the outer cylinder 3206 is fixedly connected to the bottom outer wall of the lower grinding plate 30. When the arc plate 3201 is subjected to the pressure of the upper grinding plate 34, the arc plate 3201 will drive the inner frame 3205 to move into the outer cylinder 3206.

[0023] A force-bearing rod 3204 is fixedly connected to the outer wall of the top of the closing plate 3202, and the force-bearing rod 3204 is slidably fitted and installed in the guide groove of the limit frame 3203. The outer wall of the limit frame 3203 is fitted on the fixed frame 35, and three guide grooves 36 are opened on the outer wall of the fixed frame 35, and the inner walls of adjacent guide grooves 36 are protruded in opposite directions. The inner side of the guide groove 36 is fitted with the force-bearing rod 3204, and the two ends of the fixed frame 35 are fixedly installed and connected to the corresponding mounting brackets. On the loading plate 31, the axis of the fixing frame 35 intersects with the axis of the loading plate 31 at right angles, and the two ends of the upper grinding plate 34 are fitted between the loading plates 31. When the lower grinding plate 30 drives the limit frame 3203 to move horizontally, the limit frame 3203 will drive the closing plate 3202 and the force rod 3204 to move synchronously, so that the force rod 3204 can move in the guide groove 36 on the fixing frame 35. At this time, the force rod 3204 can drive the corresponding closing plate 3202 to move back and forth.

[0024] The method for producing an iron-rich and low-silicon composite binder system for iron ore pellets comprises the following steps: S1: The user feeds the raw material into the dryer 2 for drying, and the dried raw material falls into the corresponding silo 3, while the other two silos 3 store corresponding auxiliary materials. Then the user controls the corresponding silo 3 to discharge the raw material and the auxiliary material falls into the mixer 4 for mixing, and then the mixer 4 discharges the composite material into the primary grinding shell 5; S2: The device controls the servo motor 7 to start synchronously. At this time, the output shaft of the servo motor 7 will drive the cross column 12 to rotate synchronously, and the cross column 12 will drive the grinding column 9 and the transmission rod 16 to rotate synchronously. The guide rod 11 on the top of the grinding column 9 will move along the protrusion in the guide ring 8. The guide rod 11 will drive the rotating grinding column 9 to move up and down synchronously, so that the grinding column 9 can further crush and reset the material while rotating and grinding the composite material, and the moving grinding column 9 will drive the push plate 14 to move synchronously along the limit groove 13. At this time, the push plate 14 can move back and forth. The push plate 14 will push the auxiliary pressure plate 10 to move synchronously through the sliding rod 15, so that the auxiliary pressure plate 10 can swing back and forth around the horizontal axis at the top of the grinding column 9, and the auxiliary pressure plate 10 protruding from the grinding column 9 can further press the composite material to the inner wall of the primary grinding shell 5 for re-grinding; S3: During this process, the device controls the electric cylinder 18 to start intermittently, so that the electric cylinder 18 can pull the baffle 17 to move, so that the baffle 17 can intermittently open the discharge port at the bottom of the primary grinding shell 5, thereby increasing the grinding time. After that, the reset material in the primary grinding shell 5 will fall into the filter arc plate 26, and the previously rotating transmission rod 16 will drive the gear ring 19 to rotate synchronously, and the gear ring 19 will drive the transmission gear 20 to rotate synchronously, and the transmission gear 20 will drive the cam 21 coaxially installed at the bottom to rotate synchronously, and the cam 21 will drive the motion frame 22 to perform a reset motion, and the motion frame 22 will drive the moving frame 23 installed at the bottom to move synchronously, at this time The moving frame 23 will drive the tooth plate 24 to move synchronously, and the tooth plate 24 will drive the swing gear 25 to rotate, so that the swing gear 25 will drive the filter arc plate 26 to swing back and forth, and the material with a qualified particle diameter filtered out by the filter arc plate 26 will be discharged through the side discharge rack 27, and the remaining material with a particle diameter that is too large will fall between the lower grinding plate 30 and the upper grinding plate 34 through the material channel 29; S4: The moving moving frame 23 will drive the lifting platform 39 installed at the bottom to move synchronously, so that the convex shaft 40 on the lifting platform 39 can move along the wave groove on the vertical plate 41. At this time, the lifting platform 39 will reciprocate in the vertical direction. During this process, the lifting platform 39 will drive the lower grinding plate 30 to move synchronously through the sliding block 38 and the thrust frame 37, so that the lower grinding plate 30 can swing back and forth around the positioning axis 33. The lower grinding plate 30 will drive the loading plates 31 at both ends to rotate synchronously, and the material will be squeezed toward the upper grinding plate 34 through the lower grinding plate 30, thereby improving the material crushing effect. When the lower grinding plate 30 presses the upper grinding plate 34, the arc plate 3201 will be forced to rotate on the closing plate 3202, so that the arc plate 3201 can apply pressure to the inner frame 3205, so that the inner frame 3205 will move into the outer cylinder 3206, and the return spring 3207 is compressed by the inner frame 3205. S5: The moving frame 23 can push the lower grinding plate 30 to move horizontally back and forth through the insert plate 42. The lower grinding plate 30 will slide in the slot of the loading plate 31, and the lower end of the lower grinding plate 30 will slide along the positioning shaft 33, so that the lower grinding plate 30 and the upper grinding plate 34 can further grind the material. At the same time, the lower grinding plate 30 will drive the closing plate 3202 and the limiting frame 3203 to move synchronously, and the force rod 3204 on the top of the closing plate 3202 will move along the guide groove 36 on the fixed frame 35. At this time The force-bearing rod 3204 will drive the corresponding closing plate 3202 and the arc plate 3201 to move synchronously. Since the inner wall protrusions of adjacent guide grooves 36 are in opposite directions, the movement directions of adjacent force-bearing rods 3204 are also synchronously opposite. Therefore, when the middle arc plate 3201 slides downward, the arc plates 3201 on both sides will slide upward, and the staggered sliding of the three arc plates 3201 will be used to further grind the material between the lower grinding plate 30 and the upper grinding plate 34, thereby effectively increasing the grinding area.

[0025] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The production system of iron-rich and low-silicon composite binder for iron ore pellets includes: A support frame (1) has a dryer (2) and a mixer (4) fixedly mounted on its top, the mixer (4) being located below the dryer (2), and the top of the mixer (4) being fixedly connected to discharge ports of three silos (3), the material discharge ports of the dryer (2) being located at the feed ports of the corresponding silos (3); It is characterized by further comprising: A primary grinding shell (5) is provided with a lower port of the mixer (4) at a feed inlet at the top thereof, a discharge port at the bottom end of the primary grinding shell (5) is fixedly connected to the top of the secondary grinding shell (6), and a side wall of the secondary grinding shell (6) is fixedly connected to the support frame (1), a servo motor (7) is coaxially fixedly mounted on the top of the primary grinding shell (5), and a guide ring (8) fixedly connected to the inner wall of the primary grinding shell (5) is provided directly below the servo motor (7), a grinding column (9) is coaxially fitted on the inner wall of the guide ring (8), and the axis of the grinding column (9) is from top to bottom. A cross column (12) and a transmission rod (16) are inserted and slidably penetrated in sequence at the bottom, the top of the transmission rod (16) is coaxially fixedly connected to the bottom end of the cross column (12), and the top of the cross column (12) is coaxially fixedly mounted on the output shaft of the servo motor (7), the grinding column (9) is coaxially arranged on the inner side of the primary grinding shell (5), and the bottom end of the grinding column (9) passes through the discharge port of the primary grinding shell (5), and a filter arc plate (26) is arranged directly below the bottom end of the grinding column (9), and the filter arc plate (26) is rotatably fitted on the inner wall of the secondary grinding shell (6); A loading plate (31) is symmetrically distributed obliquely below the filter arc plate (26), the loading plate (31) is rotatably embedded on the inner wall of the secondary grinding shell (6), and the two ends of a positioning shaft (33) are fixedly connected between the loading plates (31), and the positioning shaft (33) is rotatably installed through the bottom end of the lower grinding plate (30), and the two ends of the lower grinding plate (30) are slidably inserted in the installation grooves corresponding to the loading plate (31), the secondary grinding shell (6) is provided with a material channel (29), and the upper end of the material channel (29) is arranged toward the lower end of the filter arc plate (26), and the lower end of the material channel (29) is arranged toward the top of the lower grinding plate (30), and an upper grinding plate (34) is arranged above the lower grinding plate (30), and the upper grinding plate (34) and the lower grinding plate (30) The lower grinding plate (30) is arranged to be inclined, and the upper grinding plate (34) is fixedly connected to the inner wall of the secondary grinding shell (6); a grinding enhancement mechanism (32) is slidably mounted on the lower grinding plate (30); the grinding enhancement mechanism (32) comprises an arc plate (3201); the arc plate (3201) is slidably penetrated and fitted in a sliding groove of the lower grinding plate (30); three arc plates (3201) are arranged on the lower grinding plate (30); the arc plate (3201) is rotatably fitted and penetrated through a closing plate (3202); the closing plate (3202) is fitted on the outer wall of the lower grinding plate (30); the top end of the lower grinding plate (30) is fixedly connected to a limiting frame (3203); and the limiting frame (3203) is slidably penetrated through the top end of the closing plate (3202) to form a sliding guide structure.

2. The production system of iron-rich and low-silicon composite binder for iron ore pellets according to claim 1, characterized in that: A guide rod (11) is fixedly installed on the top side wall of the grinding column (9), and the end of the guide rod (11) is fitted between the protrusions on the inner wall of the guide ring (8). Auxiliary pressure plates (10) with equal angle distribution are rotatably fitted and embedded on the side wall of the grinding column (9), and the outer wall of the auxiliary pressure plate (10) is flush with the side wall of the grinding column (9). The bottom end surface of the auxiliary pressure plate (10) is an arc-shaped structure, and a cross bar on the grinding column (9) is rotatably installed through the top of the auxiliary pressure plate (10).

3. The production system of iron-rich and low-silicon composite binder for iron ore pellets according to claim 2, characterized in that: The inner wall of the auxiliary pressure plate (10) is slidably mounted with protrusions at both ends of the sliding rod (15), and one end of the push plate (14) is rotatably connected to the sliding rod (15), and the transverse axis of the other end of the push plate (14) is rotatably fitted in a limiting groove (13) provided on the cross column (12), and the push plate (14) is slidably embedded in the inner wall of the grinding column (9), and the limiting groove (13) is a wavy structure. A baffle (17) with a blocking function is fitted on the side wall of the bottom end of the grinding column (9), and the baffles (17) are symmetrically distributed at the discharge port of the primary grinding shell (5), and the outer wall of the baffle (17) is fixedly connected to the moving end of the electric cylinder (18), and the electric cylinder (18) is fixedly installed through the outer wall of the primary grinding shell (5).

4. The production system of iron-rich and low-silicon composite binder for iron ore pellets according to claim 1, characterized in that: A gear ring (19) is coaxially fixedly mounted on the lower end of the transmission rod (16), and a transmission gear (20) is meshedly arranged on the side of the gear ring (19), and the transmission gear (20) and the gear ring (19) are rotatably embedded in the inner wall of the primary grinding shell (5), a cam (21) is fixedly connected to the bottom of the rotating shaft of the transmission gear (20), and the distal end of the cam (21) is fitted on the inner wall of a moving frame (22), the moving frame (22) is slidably mounted on the inner wall of the secondary grinding shell (6), and the top end of a moving frame (23) is fixedly connected to the bottom surface of the moving frame (22), and the moving frame (23) is slidably fitted on the inner wall of the secondary grinding shell (6).

5. The production system of iron-rich and low-silicon composite binder for iron ore pellets according to claim 1, characterized in that: The filter arc plate (26) is arranged obliquely, and a connecting shaft of a swing gear (25) is coaxially fixedly mounted on the outer wall of the upper end of the filter arc plate (26), and the swing gear (25) is rotatably embedded in the inner wall of the secondary grinding shell (6), and a tooth plate (24) is meshingly arranged below the swing gear (25), and the tooth plate (24) is slidably embedded in the inner wall of the secondary grinding shell (6), and the tooth plate (24) is fixedly mounted on the outer wall of the moving frame (23), and an auxiliary scraper (28) is fitted on the bottom surface of the filter arc plate (26), and the bottom of the auxiliary scraper (28) is elastically connected to the top groove of the side discharge frame (27) through a spring, and the bottom of the side discharge frame (27) is fixedly connected to the inner wall of the secondary grinding shell (6).

6. The production system of iron-rich and low-silicon composite binder for iron ore pellets according to claim 1, characterized in that: A force-bearing rod (3204) is fixedly connected to the outer wall at the top end of the closing plate (3202), and the force-bearing rod (3204) is slidably fitted and installed in the guide groove of the limiting frame (3203). The outer wall of the limiting frame (3203) is fitted on the fixing frame (35), and three guide grooves (36) are provided on the outer wall of the fixing frame (35), and the inner wall protrusions of adjacent guide grooves (36) are in opposite directions. The force-bearing rod (3204) is fitted on the inner side of the guide groove (36). The two ends of the fixing frame (35) are fixedly installed and connected to the corresponding loading disk (31), and the axis of the fixing frame (35) intersects perpendicularly with the axis of the loading disk (31). The two ends of the upper grinding plate (34) are fitted between the loading disks (31).

7. The production system of iron-rich and low-silicon composite binder for iron ore pellets according to claim 1, characterized in that: A cross bar at the top of the inner frame (3205) is fitted in the through groove at the bottom of the arc-shaped plate (3201), and the bottom side wall of the inner frame (3205) is slidably inserted into the inner side of the outer cylinder (3206), and a return spring (3207) is fixedly connected between the bottom surface of the inner frame (3205) and the inner wall of the outer cylinder (3206), and the top end of the outer cylinder (3206) is fixedly connected to the bottom outer wall of the lower grinding plate (30).

8. The production system of iron-rich and low-silicon composite binder for iron ore pellets according to claim 1, characterized in that: The bottom of the lower grinding plate (30) is rotatably connected to the upper end of the thrust frame (37) at one side away from the upper grinding plate (34), and the lower end of the thrust frame (37) is rotatably connected to the top of the sliding block (38), and the bottom of the sliding block (38) is slidably mounted on the top of the lifting platform (39), the lower end of the lower grinding plate (30) faces the discharge port of the secondary grinding shell (6), and an arc-shaped plug plate (42) is fixedly connected to the top outer wall of the lower grinding plate (30), and the center of the plug plate (42) is on the axis of the positioning shaft (33), and the bottom of the plug plate (42) is rotatably inserted into the slot of the movable frame (23).

9. The system for producing an iron-rich, low-silicon composite binder for iron ore pellets according to claim 8, characterized in that: The two sides of the lifting platform (39) slide through guide pillars on which the bottom end of the moving frame (23) is installed, and the side walls of the lifting platform (39) are fitted on the outer wall of the vertical plate (41), and the bottom of the vertical plate (41) is fixedly connected to the inner wall of the secondary grinding shell (6), and a convex shaft (40) is fitted inside the wave groove of the vertical plate (41), and one end of the convex shaft (40) away from the vertical plate (41) is vertically fixedly connected to the side wall of the lifting platform (39).

10. A method for producing an iron-rich, low-silicon composite binder system for iron ore pellets, using the iron-rich, low-silicon composite binder production system for iron ore pellets as claimed in any one of claims 1 to 9, characterized in that: The steps include: S1: The user feeds the raw material into the dryer (2) for drying, and the dried raw material falls into the corresponding silo (3), while the other two silos (3) store corresponding auxiliary materials. The user then controls the corresponding silo (3) to discharge the material, and the raw material and auxiliary materials fall into the mixer (4) for mixing. The mixer (4) then discharges the composite material into the primary grinding shell (5); S2: The device controls the servo motor (7) to start synchronously. At this time, the output shaft of the servo motor (7) drives the cross column (12) to rotate synchronously, and the cross column (12) drives the grinding column (9) and the transmission rod (16) to rotate synchronously. The guide rod (11) at the top of the grinding column (9) moves along the protrusion in the guide ring (8). The guide rod (11) drives the rotating grinding column (9) to move up and down synchronously, so that the grinding column (9) can further grind the composite material while rotating. The material is crushed and reset step by step, and the moving grinding column (9) drives the push plate (14) to move synchronously along the limit groove (13). At this time, the push plate (14) can move back and forth, and the push plate (14) will push the auxiliary pressure plate (10) to move synchronously through the sliding rod (15), so that the auxiliary pressure plate (10) can swing back and forth around the horizontal axis at the top of the grinding column (9), and the auxiliary pressure plate (10) protruding from the grinding column (9) can further press the composite material to the inner wall of the primary grinding shell (5) for re-grinding; S3: During this process, the device controls the electric cylinder (18) to start intermittently, so that the electric cylinder (18) can pull the baffle (17) to move, so that the baffle (17) can intermittently open the discharge port at the bottom of the primary grinding shell (5), thereby increasing the grinding time. After that, the reset material in the primary grinding shell (5) will fall into the filter arc plate (26), and the previously rotating transmission rod (16) will drive the gear ring (19) to rotate synchronously, and the gear ring (19) will drive the transmission gear (20) to rotate synchronously, and the transmission gear (20) will drive the cam (21) coaxially installed at the bottom to rotate synchronously, and the cam (21) will rotate synchronously. 1) will drive the moving frame (22) to perform a reset movement, and the moving frame (22) will drive the moving frame (23) installed at the bottom to move synchronously. At this time, the moving frame (23) will drive the tooth plate (24) to move synchronously, and the tooth plate (24) will drive the swing gear (25) to rotate, so that the swing gear (25) will drive the filter arc plate (26) to swing back and forth, and the materials with qualified particle diameters filtered by the filter arc plate (26) will be discharged through the side discharge frame (27), while the remaining materials with excessively large particle diameters will fall between the lower grinding plate (30) and the upper grinding plate (34) through the material channel (29); S4: The moving moving frame (23) drives the lifting platform (39) installed at the bottom to move synchronously, so that the convex shaft (40) on the lifting platform (39) can move along the wave groove on the vertical plate (41). At this time, the lifting platform (39) will reciprocate in the vertical direction. During this process, the lifting platform (39) will drive the lower grinding plate (30) to move synchronously through the sliding block (38) and the thrust frame (37), so that the lower grinding plate (30) can reciprocate around the positioning shaft (33). The lower grinding plate (30) will drive The loading plates (31) at both ends rotate synchronously, and the material is pressed toward the upper grinding plate (34) through the lower grinding plate (30), thereby improving the material crushing effect. When the lower grinding plate (30) presses the upper grinding plate (34), the arc plate (3201) is forced to rotate on the closing plate (3202), so that the arc plate (3201) can apply pressure to the inner frame (3205), so that the inner frame (3205) moves into the outer cylinder (3206), and at the same time, the return spring (3207) is compressed by the inner frame (3205); S5: The moving frame (23) can push the lower grinding plate (30) to move horizontally back and forth through the insert plate (42), and the lower grinding plate (30) will slide in the slot of the loading plate (31). The lower end of the lower grinding plate (30) will slide along the positioning shaft (33), so that the lower grinding plate (30) and the upper grinding plate (34) can further grind the material. At the same time, the lower grinding plate (30) will drive the closing plate (3202) and the limiting frame (3203) to move synchronously, and the force rod (3204) on the top of the closing plate (3202) will move along the guide groove (36) on the fixed frame (35). ) moves, at which time the force-bearing rod (3204) will drive the corresponding closing plate (3202) and the arc plate (3201) to move synchronously. Since the inner wall protrusions of adjacent guide grooves (36) are in opposite directions, the movement directions of adjacent force-bearing rods (3204) are also synchronously opposite. Therefore, when the arc plate (3201) in the middle slides downward, the arc plates (3201) on both sides will slide upward. The material between the lower grinding plate (30) and the upper grinding plate (34) is further ground by the offset sliding of the three arc plates (3201), thereby effectively increasing the grinding area.

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