Ball pressing structure beneficial to magnesium ball preparation, ball pressing machine and magnesium ball preparation method

Abstract

The invention belongs to the technical field of ball pressing equipment, and particularly relates to a ball pressing structure beneficial to magnesium balls, the structure comprises a pair of supporting shafts which are arranged in parallel, ball pressing rollers are rotatably arranged on the surfaces of the supporting shafts respectively, a plurality of first ball pressing grooves are formed in the surfaces of the ball pressing rollers, second ball pressing grooves are movably formed in the first ball pressing grooves, and the second ball pressing grooves are movably formed in the first ball pressing grooves in the radial direction of the ball pressing rollers. A through hole is formed in the bottom of the ball pressing groove, an elastic telescopic mechanism is arranged in the through hole, one end of the elastic telescopic mechanism is connected with the second ball pressing groove, the other end of the elastic telescopic mechanism abuts against the supporting shaft in a matched mode, and protruding adjusting mechanisms are symmetrically arranged at the first position of the side face of the supporting shaft in the axial direction of the supporting shaft. When the ball pressing roller relatively rotates to a first position, at least one pair of first ball pressing grooves form a first ball pressing space to preliminarily compress powder, and at least part of the protruding adjusting mechanism protrudes out of the surface of the supporting shaft and controls the movement amount of the elastic telescopic mechanism, so that the second ball pressing grooves relatively form a second ball pressing space to further compress magnesium balls.

Description

Technical Field

[0001] The present application belongs to the technical field of ball pressing equipment, and in particular relates to a ball pressing structure, a ball pressing machine and a method for preparing magnesium balls that are beneficial to magnesium balls. Background Art

[0002] In the Pidgeon process of magnesium refining, ferrosilicon, calcined dolomite (referred to as calcined white) and fluorite powder are prepared in a specific proportion, mixed, ground into powder, and then pressed into ellipsoidal or other shaped magnesium agglomerates. The magnesium agglomerates are calcined at high temperature to gasify the magnesium, and then cooled to collect crude magnesium oxide. The powder is usually input into a briquette press or magnesium agglomerate pressing equipment as the extruded material, and the powder is continuously extruded by a double-roll extrusion structure or a mold flat-pressing structure to achieve the purpose of granulation. Studies have found that spherical magnesium agglomerates, i.e. magnesium balls, are evenly heated during the reduction process of magnesium production, and magnesium vapor is easily released during the calcination process, which is beneficial to improving the efficiency and output of magnesium production.

[0003] In the prior art, a Chinese utility model with publication number CN215365925U discloses a light-burned magnesium oxide ball pressing device, which includes a shell, the upper part of which is connected to a feed port, and the inside of which is provided with a ball pressing mechanism, a material receiving plate and a collecting drawer from top to bottom; the ball pressing mechanism includes two relatively rotating ball pressing rollers, the ball pressing rollers are connected to a driving mechanism, and the ball pressing rollers are provided with extrusion grooves that can cooperate with each other, and the upper and lower parts of the ball pressing rollers are respectively opposite to the feed port and the material receiving plate, the material receiving plate is tilted downward, and is provided with a plurality of leakage holes, and the collecting drawer is located below the material receiving plate for receiving dust falling from the leakage holes. The utility model provides leakage holes on the receiving plate, and the powder falling off the ball falls down from the leakage holes into the collecting bin and is recycled through the collecting bin. However, the utility model has the following defects in the actual ball pressing process: first, the two ball pressing rollers are fixed-distance ball pressing rollers, and the pressure value between the ball pressing rollers cannot be adjusted. It is easy to be affected by factors such as rotation speed, material humidity and / or particle size, resulting in excessive or insufficient pressure. Excessive pressure can easily cause the ball pressing rollers to get stuck, causing serious wear on the roller surface over a long period of time, thereby reducing the yield rate of the produced magnesium balls; too little pressure can easily lead to insufficient compactness of the magnesium balls. The loose magnesium balls can easily break due to extrusion or collision during the discharge and transportation process. A large amount of dust or fine slag is generated during the calcination process, resulting in uneven heating of the magnesium balls, affecting the efficiency and output of magnesium production. Summary of the invention

[0004] Based on the above-mentioned background technical needs, the present application provides a ball pressing structure that is conducive to the preparation of magnesium balls, which is used to solve the problem in the prior art that two ball pressing rollers are fixed-spaced for ball pressing, and the pressure value cannot be adjusted. It is easy to be affected by factors such as rotation speed, material viscosity and / or hardness, resulting in excessive or insufficient pressure. Excessive pressure can easily cause the ball pressing roller to get stuck, causing serious wear on the roller surface over a long period of time, and reducing the yield rate of the produced magnesium balls; too little pressure can easily lead to insufficient compactness of the magnesium balls, and the loose magnesium balls can easily break due to extrusion or collision during the discharging and transportation process, and a large amount of dust or fine slag can be generated during the calcination process, resulting in uneven heating of the magnesium balls, affecting the efficiency and output of magnesium production.

[0005] In order to achieve the above purpose, the technical solution of this application is:

[0006] 14. The method of claim 13 wherein the plurality of rollers are arranged on a pair of camshafts, each of which is adapted to move relative to the first roller and to move relative to the second roller.

[0007] Preferably, the elastic telescopic mechanism includes a spring and a driving rod, a stop protrusion is provided on one side of the through hole adjacent to the first ball pressure groove, one end of the driving rod passes through the through hole and is connected to the second ball pressure groove, and the other end is provided with a sliding protrusion, the spring is arranged around the driving rod between the stop protrusion and the sliding protrusion, and at least a part of the sliding protrusion is slidably or rollingly connected to the surface of the support shaft.

[0008] Preferably, the sliding protrusion is a sphere or a wheel, and a fork is provided at one end of the driving rod away from the second ball pressing groove, and the sliding protrusion is rollably connected to the fork.

[0009] Preferably, the protrusion adjustment mechanism includes several groups of automatic telescopic rods and a first flange, which are located at the first position. A mounting groove is axially arranged on the side surface of the support shaft, and the depth direction of the mounting groove extends radially along the support shaft. Several groups of automatic telescopic rods are evenly distributed in the mounting groove along the axial direction of the support shaft, and the telescopic end of the automatic telescopic rod is fixedly connected to the first flange. The automatic telescopic rod is used to drive the first flange to move radially along the support shaft.

[0010] Preferably, the support shaft includes a pillar and an elastic sleeve, which is located at the first position, and the mounting groove is arranged on the surface of the pillar along the axial direction of the pillar, and the elastic sleeve is arranged on the surface of the pillar along the circumferential direction of the pillar, and the end of the first flange facing away from the automatic telescopic rod is in mating contact with the inner surface of the elastic sleeve; the end of the elastic telescopic mechanism facing away from the second ball pressure groove is in mating contact with the outer surface of the elastic sleeve.

[0011] Preferably, the side surface of the pillar is spaced apart from the mounting groove and a plurality of second flanges are provided along the axial direction of the pillar, and the plurality of second flanges are distributed at intervals along the rotation direction of the ball pressing roller.

[0012] The present application also discloses a ball press machine, which includes a shell and the ball pressing structure, wherein the ball pressing structure is arranged in the shell, the upper portion of the shell is provided with a feed port, and the lower portion of the shell is provided with a discharge port, and in the shell, the feed port and the discharge port form a discharge channel along the direction of gravity, and a pair of support shafts are symmetrically fixed between the feed port and the discharge port with the extension direction of the discharge channel as the symmetry axis.

[0013] Preferably, the ball press machine also includes a driving mechanism, which includes a motor, a pair of main driving gears and a pair of planetary gear sets, the planetary gear set includes a planet carrier and a ring gear, the ring gear is coaxially fixedly connected to one end of the ball pressing roller, the planet carrier is fixedly connected to the support shaft, and a sun gear is rotatably provided at the center of the planet carrier, and a plurality of planetary gears are rotatably provided on the planet carrier around the circumference of the sun gear, and the planetary gears, the sun gear and the ring gear are meshed with each other; a pair of the main driving gears are coaxially connected to a pair of the sun gears and meshed with each other, the motor is transmission connected to any one of the pair of main driving gears, and the motor is used to drive the main driving gear to rotate.

[0014] Preferably, the driving mechanism further includes a belt, a first pulley and a second pulley, the first pulley is connected to the driving shaft of the motor, the second pulley is coaxially connected to any one of the main driving gears, and the belt is sleeved on the first pulley and the second pulley.

[0015] The present application also discloses a method for preparing magnesium balls, which is applied to the ball press machine and specifically comprises the following steps:

[0016] S10. Establishing a corresponding database based on the particle size qualification rate of the powder, the pressure value of the ball pressing roller, and the distance value between a pair of the second ball pressing grooves when the second ball pressing space is formed;

[0017] S20. Obtain the particle size qualification rate of the powder, obtain the pressure value of the ball pressing roller based on the database, and obtain the movement amount of the protrusion adjustment mechanism protruding from the surface of the support shaft based on the formula X=F / K, wherein F represents the pressure value of the ball pressing roller, K represents the elastic coefficient of the elastic telescopic mechanism, and X represents the movement amount of the protrusion adjustment mechanism protruding from the surface of the support shaft;

[0018] S30. Based on the movement amount of the protrusion adjustment mechanism protruding from the support shaft surface, the protrusion adjustment mechanism is controlled to drive so that the pressure value between a pair of the second ball pressing grooves meeting at the first position reaches the pressure value of the ball pressing roller;

[0019] S40. Based on the database and the particle size qualification rate of the powder material, the distance value between a pair of the second ball pressing grooves when the second ball pressing space is formed is obtained, based on the formula D＝(L -s ) / 2 The expansion and contraction amount of the elastic expansion and contraction mechanism is calculated, and the movement amount of the protruding adjustment mechanism protruding from the support shaft surface is verified based on the expansion and contraction amount of the elastic expansion and contraction mechanism to determine whether the two values ​​are equal. If the two values ​​are equal, the ball press machine is started to manufacture magnesium balls, wherein D represents the expansion and contraction amount of the elastic expansion and contraction mechanism, L represents the distance value between a pair of the first ball pressing grooves meeting at the first position, and S represents the distance value between a pair of the second ball pressing grooves when the second ball pressing space is formed.

[0020] By adopting the above technical solution, compared with the prior art, the present application has at least the following beneficial effects:

[0021] While the first ball pressing space compresses the powder, the second ball pressing space further compresses the powder in the first ball pressing space, which prolongs the process of magnesium ball formation compared with the prior art and increases the compactness of the magnesium balls, making the produced magnesium balls less likely to become loose or damaged. Under the premise that the spacing between the ball pressing rollers remains unchanged, the compression amount of the elastic telescopic mechanism is controlled by the protruding adjustment mechanism to control the pressure applied to the powder by the second ball pressing groove. Compared with the prior art method of adjusting the ball making pressure by directly adjusting the distance between the ball pressing rollers, the ball pressing mechanism of the present application can achieve more refined adjustment, thereby avoiding the problem of wear caused by the ball pressing roller being stuck due to too small a roller gap during the adjustment process or the compactness of the pressed magnesium balls not meeting the standard due to too large a roller gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the ball pressing structure in the embodiment.

[0023] Figure 2 A is a partial enlarged schematic diagram of the ball pressing structure in the embodiment.

[0024] Figure 3 FIG. B is a partially enlarged schematic diagram of the ball pressing roller in the embodiment.

[0025] Figure 4 FIG. 3 is a schematic diagram C of the local structure of the support shaft in the embodiment.

[0026] Figure 5 Schematic diagram of the internal structure of the ball press in the embodiment.

[0027] Figure 6 It is a schematic diagram of the local structure of the ball press in the embodiment.

[0028] Figure 7 It is a partial cross-sectional view DD of the housing in the embodiment.

[0029] Figure 8 It is an isometric perspective schematic diagram of the ball pressing roller in the embodiment.

[0030] In the figure: shell 10, feed port 11, first discharge port 12, second discharge port 13, guide trough 14, screening area 141, ball pressing structure 20, support shaft 21, pillar 211, mounting groove 2111, elastic sleeve 212, second flange 213, ball pressing roller 22, first ball pressing groove 221, through hole 222, stop protrusion 2221, second ball pressing groove 223, elastic telescopic mechanism 224, spring 2241, drive rod 2242, sliding protrusion 2243, fork 2244, protrusion adjustment mechanism 23, automatic telescopic rod 231, first flange 232, bearing 24, drive mechanism 30, motor 31, main drive gear 32, planetary gear set 33, sun gear 331, planetary gear 332, planetary carrier 333, ring gear 334, belt 34, first pulley 35, second pulley 36. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The technical solution of the present application will be further described below in conjunction with the drawings of the embodiments of the present application, and the present application is not limited to the following specific implementation methods.

[0032] It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components. In the description of the present application, it should be understood that if there are terms such as "upper", "lower", "inner", "outer", "left", "right", "front", "rear", "top", "bottom" and the like indicating directions or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the structure or component referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present patent, and for those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0033] The following is combined with Figure 1 To Attachment Figure 8 And specific embodiments further describe the present application in detail.

[0034] In the present application, a ball pressing structure 20 is disclosed, which is convenient for preparing magnesium balls. The structure includes a pair of support shafts 21 and a pair of ball pressing rollers 22 arranged in parallel. Around the circumference of each support shaft 21, the pair of ball pressing rollers 22 are respectively sleeved on the surface of the support shaft 21 and are rotatably connected to the side of the support shaft 21 through bearings 24. The outer roller surface of the ball pressing roller 22 is fixedly provided with a plurality of first ball pressing grooves 221, and the first ball pressing grooves 221 are movably provided with second ball pressing grooves 223. Along the radial direction of the ball pressing roller 22, a through hole 222 is provided at the bottom of the ball pressing groove, and the through hole 222 passes through the ball pressing groove and the ball pressing roller 22. An elastic telescopic mechanism 224 is arranged in the through hole 222, one end of the elastic telescopic mechanism 224 is connected to the bottom of the second ball pressing groove 223, and the other end is movably matched with the side surface of the support shaft 21. Along the axial direction of the support shaft 21, protruding adjustment mechanisms 23 are symmetrically arranged at the first position on the side of the support shaft 21.

[0035] Specifically, in one of the embodiments, a pair of ball pressing rollers 22 are arranged in parallel and located on the same horizontal plane, and a roller gap with a fixed distance value is formed between the ball pressing rollers 22, so that the powder enters the roller gap along the gravity direction and is squeezed by the ball pressing rollers 22; the above-mentioned first position in this embodiment is preferably the position where the outer surface contours of the pair of ball pressing rollers 22 are closest to each other, that is, the side contours of the pair of support shafts 21 are closest to each other (the cross-section of the pair of support shafts 21 is regarded as a circular middle dial, and the first position is respectively located at the three o'clock position and the nine o'clock position of the pair of dials); the first ball pressing groove 221 is hemispherical or semi-ellipsoidal, and the second ball pressing groove 223 is similar in shape to the first ball pressing groove 221 and is slightly smaller in volume than the first ball pressing groove 221.

[0036] When the ball pressing structure 20 is used, the ball pressing roller 22 is driven to rotate relative to the support shaft 21, and the powder is sprinkled between the pair of ball pressing rollers 22 along the direction of gravity. When the elastic telescopic mechanism 224 does not contact the protruding adjustment mechanism 23, the second ball pressing groove 223 is tightly attached to the bottom of the first ball pressing groove 221 due to the pulling force of the elastic telescopic mechanism 224; when the pair of first ball pressing grooves 221 pass through the first position, they meet to form a first ball pressing space. During the formation process, the first ball pressing space preliminarily compresses the powder in the first ball pressing groove 221, so that the compressed powder tends to form a spherical body; at the same time By controlling the protruding adjustment mechanism 23 to extend a certain length from the surface of the support shaft 21 at the first position, the elastic telescopic mechanism 224 meets the protruding adjustment mechanism 23 and is pushed outward by the protruding adjustment mechanism 23 during the rotation of the ball pressing roller 22, so that a pair of second ball pressing grooves 223 form a second ball pressing space in the first ball pressing space. The second ball pressing space further compresses the material tending to be spherical to form a magnesium ball with a tight structure that is not easy to loosen or break. The magnesium ball is separated from the second ball pressing groove 223 under the action of centrifugation as the ball pressing roller 22 rotates and is collected under the ball pressing roller 22.

[0037] The use of the above-mentioned ball pressing structure 20 has at least the following beneficial effects compared with the prior art: First, while the first ball pressing space compresses the powder, the second ball pressing space further compresses the powder in the first ball pressing space. Compared with the ball pressing mechanism with one-time compression, the process of magnesium ball formation is prolonged and the compactness of the magnesium ball is increased, so that the produced magnesium ball is not easy to loosen and break; Second, under the premise that the spacing between the ball pressing rollers 22 remains unchanged, the compression amount of the elastic telescopic mechanism 224 is controlled by the protruding adjustment mechanism 23, so as to control the pressure applied to the powder by the second ball pressing groove 223. Compared with the method of directly adjusting the distance between the ball pressing rollers 22 in the prior art to adjust the ball making pressure, the ball pressing mechanism of the present application can achieve more refined adjustment, avoiding the problem that the distance between the ball pressing rollers 22 is too small during the adjustment process, resulting in wear caused by the ball pressing roller 22 being stuck, or the compactness of the pressed magnesium ball is not up to standard due to the excessive roller gap.

[0038] The compact magnesium balls pressed out by the ball pressing mechanism can reduce the problem of breakage caused by extrusion and collision during discharging and transportation, as well as the problem of generating a large amount of dust or fine slag during calcination. The magnesium balls are heated more evenly, which helps to improve the efficiency and output of magnesium production.

[0039] Further, in one embodiment, the elastic telescopic mechanism 224 includes a spring 2241 and a driving rod 2242, a stopper protrusion 2221 is provided on one side of the through hole 222 adjacent to the first ball-pressing groove 221, one end of the driving rod 2242 passes through the through hole 222 and is connected to the bottom of the second ball-pressing groove 223, and a sliding protrusion 2243 is provided on the other end, the spring 2241 is arranged around the driving rod 2242 between the stopper protrusion 2221 and the sliding protrusion 2243, and at least a portion of the sliding protrusion 2243 is in sliding or rolling contact with the side surface of the support shaft 21. Specifically, at least a portion of the sliding protrusion 2243 is a contact surface that is easy to slide or roll, such as a spherical surface or a roller surface, so that the driving rod 2242 can always be in contact with the side surface of the support shaft 21 during the process of rotating around the side surface of the support shaft 21, and can avoid the driving rod 2242 from getting stuck during the movement.

[0040] When the above-mentioned ball pressing structure 20 is used, the driving rod 2242 follows the ball pressing roller 22 to move along the contour of the side of the support shaft 21. When the sliding protrusion 2243 has not reached the first position or has passed the first position, the spring 2241 always remains in an extended state under the action of the stop protrusion 2221, and the driving rod 2242 pulls the second ball pressing groove 223 along the radial direction of the ball pressing roller 22 under the elastic force of the spring 2241 to close to the bottom of the first ball pressing groove 221; when the sliding protrusion 2243 moves to the first position, the part of the protruding adjustment part protruding from the side surface of the support shaft 21 pushes the driving rod 2242 to compress the spring 2241, and the driving rod 2242 pushes the second ball pressing groove 223 to move in the direction of extending out of the first ball pressing groove 221 along the direction of compression of the spring 2241. Any pair of second ball pressing grooves 223 move relative to each other and approach each other in the first position to form a second ball pressing space, thereby pressing out a magnesium ball with a compact structure.

[0041] Furthermore, in order to achieve a better movement coordination effect between the support shaft 21 and the sliding protrusion 2243, the above-mentioned sliding protrusion 2243 is a sphere or a wheel body, and a fork head 2244 is provided at one end of the driving rod 2242 away from the second ball pressure groove 223. The fork head 2244 is composed of at least two parallel fork rods, and the sliding protrusion 2243 in the form of a sphere or a wheel body can be rotatably arranged between the fork rods through a rotating shaft, so that one end of the above-mentioned elastic telescopic mechanism 224 forms a rolling coordination with the side surface of the support shaft 21.

[0042] When using the above-mentioned ball pressing structure 20, the sliding protrusion 2243 in the form of a sphere or a wheel can roll around the support shaft 21. Compared with sliding contact, rolling contact helps to reduce the wear of the support shaft 21 and the sliding protrusion 2243, and is easier to stabilize the movement path of the driving rod 2242, and improve the sensitivity of the elastic telescopic mechanism 224, so that the elastic telescopic mechanism 224 can regularly complete the reciprocating telescopic motion, thereby ensuring that the level of compression quality of the magnesium ball can be kept consistent.

[0043] Further, in one of the embodiments, the above-mentioned protrusion adjustment mechanism 23 includes several groups of automatic telescopic rods 231 and a first flange 232, which are located at the above-mentioned first position, and the side surfaces of the support shaft 21 are respectively provided with mounting grooves 2111 along the axial direction, and the depth direction of the mounting grooves 2111 extends along the radial direction of the support shaft 21. Several groups of the above-mentioned automatic telescopic rods 231 are evenly distributed in the mounting grooves 2111 along the axial direction of the support shaft 21, and the telescopic ends of the automatic telescopic rods 231 are fixedly connected to the first flange 232, and the automatic telescopic rods 231 are used to drive the first flange 232 to move radially along the support shaft 21.

[0044] Specifically, the end of the first flange 232 facing away from the automatic telescopic rod presents an arc surface close to the side profile of the support shaft 21, and the length of the first flange 232 is not less than the length range of the first ball pressing groove 221 distributed axially on the ball pressing roller 22. The automatic telescopic rod 231 is controlled by a signal controller located outside the above-mentioned ball pressing structure 20 to control the extension length of its telescopic end.

[0045] When using the above-mentioned ball pressing structure 20, the extension length of the automatic telescopic rod 231 is controlled according to the pressure required for pressing the balls in the second ball pressing space, so that the first flange 232 can achieve the function of adjusting the extension length of the driving rod 2242. The distance at which the first flange 232 is pushed out of the installation groove 2111 by the automatic telescopic rod 231 and protrudes from the side surface of the support shaft 21 determines the distance between a pair of second ball pressing grooves 223. The smaller the distance, the greater the ball making pressure, thereby achieving the purpose of finely adjusting the ball making pressure.

[0046] Furthermore, in order to reduce the impact caused by the rotation of the ball pressing roller 22 when the first flange 232 interacts with the elastic telescopic mechanism 224, the support shaft 21 in the above embodiment includes a pillar 211 and an elastic sleeve 212, the elastic sleeve 212 is a rubber sleeve with a ring-shaped cross-section, located at the above first position, the above-mentioned mounting groove 2111 is arranged on the outer surface of the pillar 211 along the axial direction of the pillar 211, and the elastic sleeve 212 is sleeved on the outer side of the pillar 211 along the circumferential direction of the pillar 211, and the protruding adjustment mechanism 23 installed in the mounting groove 2111 is surrounded by the elastic sleeve 212 and the pillar 211, wherein the end of the first flange 232 away from the automatic telescopic rod 231 is in cooperation and contact with the inner surface of the elastic sleeve 212, and the end of the elastic telescopic mechanism 224 away from the second ball pressing groove 223 is in cooperation and contact with the outer surface of the elastic sleeve 212 respectively.

[0047] When the ball pressing structure 20 is used, the first flange 232 is driven by the automatic telescopic rod 231 to protrude from the surface of the pillar 211, and the first flange 232 pushes the elastic sleeve 212 outward, so that the elastic sleeve 212 forms a smooth protrusion in the first position in the direction away from the pillar 211. During the rotation of the ball pressing roller 22 around the pillar 211, the end of the elastic telescopic mechanism 224 away from the second ball pressing groove 223 can roll or slide along the outer contour of the elastic sleeve 212, and smoothly travel to the outermost end of the protrusion at the first position, and under the action of the protrusion, a pair of second ball pressing grooves 223 move relative to each other and form a second ball pressing space. Compared with the elastic telescopic mechanism 224 directly contacting the first flange 232, the smooth protrusion on the elastic sleeve 212 plays the role of sequentially guiding the elastic telescopic mechanism 224 to perform telescopic movements, avoiding the elastic telescopic mechanism 224 and the first flange 232 hard contact during the rotation of the ball pressing roller 22 to produce a large impact, thereby helping to reduce the wear of various components of the ball pressing structure 20 and extend the service life.

[0048] Furthermore, in order to prevent the magnesium ball from being stuck in the second ball pressing groove 223 and being repeatedly pressed, a plurality of second flanges 213 are arranged on the side of the pillar 211, spaced apart from the mounting groove 2111 and extending along the axial direction of the pillar 211. The plurality of second flanges 213 are arranged in a smooth arc shape and are spaced apart around the rotation direction of the ball pressing roller 22. In an embodiment with better effect, the cross section of a pair of pillars 211 is regarded as a dial of a clock. On the left pillar 211, the plurality of second flanges 213 are spaced apart at positions between three o'clock and six o'clock, and on the right pillar 211, the plurality of second flanges 213 are arranged at positions between nine o'clock and six o'clock.

[0049] When the above-mentioned ball pressing structure 20 is used, as the ball pressing roller 22 rotates, after the several pairs of second ball pressing grooves 223 that meet at the first position press out the magnesium balls, the magnesium balls gradually fall to the bottom of the ball pressing roller 22 under the centrifugal action as the second ball pressing grooves 223 separate; when some magnesium balls are stuck in the second ball pressing grooves 223, under the action of the several second flanges 213, the telescopic driving assembly continuously pushes the second ball pressing grooves 223 to shake below the first position, so that the magnesium balls quickly break away from the second ball pressing grooves 223, thereby preventing the magnesium balls from being sent back to the first position again.

[0050] Furthermore, the present application also provides a ball press machine, which includes a shell 10 and the above-mentioned ball pressing structure 20. A feed port 11 is provided at the upper portion of the shell 10, and a discharge port is provided at the lower portion of the shell 10. The feed port 11 and the discharge port form a discharge channel in the shell 10 along the direction of gravity. The above-mentioned ball pressing structure 20 is arranged in the shell 10, and a pair of support shafts 21 of a pair of ball pressing structures 20 are fixed between the feed port 11 and the discharge port with the extension direction of the above-mentioned discharge channel as the symmetry axis.

[0051] In a more specific embodiment, in order to improve the efficiency of obtaining magnesium balls, the above-mentioned discharge port includes a first discharge port 12 and a second discharge port 13 spaced apart along the direction of gravity, and in the shell 10, the feed port 11, the ball pressing roller 22 and the second discharge port 13 are arranged along the direction of gravity, and a guide trough 14 is obliquely arranged between the first discharge port 12 and the second discharge port 13, one end of the guide trough 14 is connected to the first discharge port 12, and the other end extends obliquely upward toward the lower side of the ball pressing roller 22 away from the first discharge port 12, and a screening area 141 is arranged on the bottom surface of the guide trough 14 relative to the second discharge port 13, and a plurality of sieve holes are arranged in the screening area 141 along the direction of gravity.

[0052] When using the above-mentioned ball press machine to press balls, the powder enters between the ball pressing rollers 22 through the feed port 11 above the shell 10, and the rotating ball pressing rollers 22 press the powder into magnesium balls. The magnesium balls break away from the ball pressing rollers 22 and fall onto the guide trough 14, and are collected at the first discharge port 12 under the guidance of the guide trough 14; the powder that falls outside the first ball pressing trough 221 during the ball pressing process passes through the roller gap of the ball pressing roller 22 under the action of gravity, and is separated from the magnesium balls through the sieve holes of the screening area 141, and is collected at the second discharge port 13.

[0053] Furthermore, in order to slow down the rotation speed of the ball pressing roller 22 and prolong the ball pressing process, the ball pressing machine further includes a driving mechanism 30, which includes a motor 31, a pair of main driving gears 32 and a pair of planetary gear sets 33, wherein the planetary gear set 33 includes a planetary carrier 333 and a gear ring 334, the inner side of the gear ring 334 is provided with tooth patterns, the gear ring 334 is respectively fixedly connected to one end of the ball pressing roller 22, the planetary carrier 333 is fixedly connected to one end of the support shaft 21, and the center of the planetary carrier 333 is rotatably provided with a sun gear 331, A plurality of planetary gears 332 are also provided on the frame 333 around the circumference of the sun gear 331. The sun gear 331, the planetary gears 332, and the ring gear 334 of the same planetary gear set 33 are meshed with each other from the inside to the outside. The above-mentioned pair of main drive gears 32 are rotatably arranged on the outside of the shell 10 through a rotating shaft, and are respectively coaxially connected to the sun gear 331 of the planetary gear set 33. The pair of main drive gears 32 are meshed with each other, and the motor 31 is fixed to the outside of the shell 10 and its drive shaft is connected to any one of the pair of main drive gears 32.

[0054] When the ball press machine is used, the starter motor 31 drives a pair of main drive gears 32 to rotate relative to each other under meshing action, and the sun gears 331 coaxially connected to each main drive gear 32 also rotate relative to each other, and the planetary gears 332 on the planetary carrier 333 rotate around the sun gear 331 to drive the ring gear 334 to rotate. The ring gear 334 rotates at a speed slower than the sun gear 331 according to the reduction ratio of the planetary gear 332. Therefore, under the deceleration effect of the planetary gear set 33, the ball pressing roller 22 rotates stably at a speed lower than the output speed of the motor 31, thereby extending the time for the elastic telescopic mechanism 224 to pass through the first position, so that the ball pressing process is extended, so as to cooperate with the second ball pressing groove 223 to press out compact balls.

[0055] Furthermore, in order to reduce the load impact between the motor 31 and the main drive gear 32 so that the main drive gear 32 can transmit stably, the above-mentioned driving mechanism 30 also includes a belt 34, a first pulley 35 and a second pulley 36, wherein the first pulley 35 is connected to the driving shaft of the motor 31, and the second pulley 36 is coaxially connected to any one of a pair of main drive gears 32, and the belt 34 is sleeved on the first pulley 35 and the second pulley 36.

[0056] When using the above device, the motor 31 drives the second pulley 36 to rotate through the friction force of the belt 34 while driving the first pulley 35 to rotate, thereby reducing the power of starting the main driving gear 32 and avoiding excessive load impact that affects the service life and operating stability of the above driving mechanism 30.

[0057] In addition, the present application also provides a method for preparing magnesium balls, which is prepared by using the above-mentioned ball press, and specifically comprises the following steps:

[0058] Step 1: Establish a database corresponding to each other including the particle size qualification rate of the powder, the pressure value of the ball pressing roller 22 and the distance value between a pair of second ball pressing grooves 223 that meet at the first position to form the second ball pressing space.

[0059] This step specifically requires the following work:

[0060] S11. On the premise that the hardness, appearance and compactness of the pressed magnesium balls meet the standards, the particle size qualification rate of the powder before ball pressing is measured in advance by screening method, sedimentation method and other methods for measuring the particle size value of the powder and the instruments or equipment used in the related methods. The particle size qualification rate is expressed as the percentage of the powder content with a powder size ≤ 200 mesh to the total content of the powder, that is, the powder content with a particle size ≤ 0.074 mm is greater than n%, (1≤n≤100); the pressure value of the ball pressing roller 22 required to press the powder with each particle size qualification rate (refer to the pressure measurement standard of the roller ball press commonly used in the market to measure the pressure value); and check whether the pressed magnesium balls meet the standards by simulating the ball pressing process, and measure the distance between a pair of second ball pressing grooves 223 that meet at the first position to cause the magnesium balls to meet the standards, specifically by opening the ball press housing 10, placing a special ultrasonic distance sensor in the roller gap, and measuring the distance value between the pair of second ball pressing grooves 223 that meet at the first position at each pressure value reached;

[0061] S12. Based on the correspondence between the particle size qualification rate of the above-mentioned powder, the pressure value of the ball pressing roller 22 and the distance value between the second ball pressing grooves 223 - a database of multiple sets of data is established (the database is shown in the form of a chart as an example).

[0062] It should be noted that, according to the experience of magnesium ball preparation, powder with a particle size value ≤ 200 mesh is suitable for preparing magnesium balls of good quality, and powder with a particle size value larger than this range is regarded as unqualified powder. When the particle size qualification rate of the powder is less than 60%, it has an adverse effect on the wear of the ball pressing roller 22 and the quality of the magnesium balls. Therefore, this experimental process only considers the preparation of magnesium balls with qualified powder with a particle size qualification rate of not less than 60%, so as to ensure that the magnesium balls produced have a high compliance rate and reduce waste and loss.

[0063] Based on the above reasons, 7 groups of powders with particle size qualification rates between 60% and 90% were respectively selected to carry out ball making experiments using the above-mentioned ball press machine. The pressure values ​​of the ball pressing roller 22 (expressed as pressure values ​​in the table) and the distance values ​​between the second ball pressing grooves 223 (expressed as distance values ​​in the table) corresponding to each group of powders are shown in the following table.

[0064] Serial number Particle size qualified rate (%) Pressure value (MPa) Distance value (mm) 1 60 15.7 16 2 65 14.3 18 3 70 13.5 19 4 75 11.6 22 5 80 10.3 25 6 85 9.2 28 7 90 8.5 30

[0065] After multiple verifications of the above data, it was found that the yield rate of magnesium balls can be effectively guaranteed as long as the particle size qualification rate is ≥ 60% and the pressure value is between 8 and 16 MPa.

[0066] In the process of selecting qualified particle size by screening powder, it is found that the pressure value and distance value do not fluctuate significantly within the range of the error value of the particle size qualification rate less than 2.5%. Therefore, when selecting the particle size, 5% is used as the data node, less than 2.5% is counted as 0, and less than or equal to 5% and greater than or equal to 2.5% is counted as 5%. Taking the particle size qualification rates of Group 1 and Group 2 in the above table as an example, the actual measured particle size qualification rates in the first group are 59%, 62%, 60%, 61.5%, and 57.5%, respectively, and the average of the pressure values ​​corresponding to each particle size qualification rate is 15.7MPa, and the distance values ​​are all 16mm. Therefore, the powder with a particle size qualification rate of 60% is used as the measurement starting value of the pressure value and the distance value, and the particle size qualification rate is increased by 5% as a representative embodiment, so as to improve the representativeness of the data and reduce the complexity of the database.

[0067] Step 2: Obtain the particle size qualification rate of the powder, bring it into the above-mentioned database to obtain the pressure value of the ball pressing roller 22, and obtain the movement amount of the protrusion adjustment mechanism 23 protruding from the surface of the support shaft 21 based on the formula X=F / K, wherein F represents the pressure value of the ball pressing roller 22, K represents the elastic coefficient of the elastic telescopic mechanism 224, and X represents the movement amount of the protrusion adjustment mechanism 23 protruding from the surface of the support shaft 21.

[0068] This step specifically requires the following work:

[0069] After the above database is combined with a computer, the database is given input and output functions. In the actual ball making process, after the obtained particle size qualification rate of the powder is input into the database, the database automatically outputs the pressure value of the ball pressing roller 22 corresponding to the input value. From the above ball pressing structure 20, it can be known that the force exerted by the protruding adjustment mechanism 23 protruding from the surface of the support shaft 21 on the spring 2241 telescopic mechanism is equal to the force exerted by the driving rod 2242 on the spring 2241, that is, the force exerted by the second ball pressing groove 223 on the powder, that is, the pressure of the ball pressing roller 22, and the protrusion of the protruding adjustment mechanism 23 is equal to the movement of the driving rod 2242 is equal to the compression of the spring 2241. When the elastic coefficient K of the elastic telescopic mechanism 224 and the pressure value F of the ball pressing roller 22 are known, the movement of the protruding adjustment mechanism 23 protruding from the surface of the support shaft 21 can be calculated based on the formula X=F / K.

[0070] Step three: based on the movement amount X of the protrusion adjustment mechanism 23 protruding from the surface of the support shaft 21 , the protrusion adjustment mechanism 23 is controlled to be driven so that the pressure value between a pair of second ball pressing grooves 223 meeting at the first position reaches the pressure value F of the ball pressing roller 22 .

[0071] This step specifically requires the following work:

[0072] The computer converts the above X value into an electrical signal that can control the extension amount of the automatic telescopic rod 231. After the electrical signal is sent to the controller of the automatic telescopic rod 231, the controller controls the extension amount of the automatic telescopic rod 231 according to the electrical signal corresponding to the X value. The automatic telescopic rod 231 drives the second ball pressing groove 223 to move relatively by the X value, so that the ball pressing roller 22 can apply a pressure of F to the powder.

[0073] Step 4: Based on the above-mentioned actual particle size qualified rate, the distance value between a pair of second ball pressing grooves 223 when forming the second ball pressing space is obtained by inputting the database, and based on the formula D＝(L -s ) / 2 The expansion and contraction amount of the elastic expansion and contraction mechanism 224 is obtained by a computer, wherein D represents the expansion and contraction amount of the elastic expansion and contraction mechanism 224, L represents the distance value between a pair of the first ball pressing grooves 221 meeting at the first position, S represents the distance value between a pair of second ball pressing grooves 223 when the second ball pressing space is formed, and the protrusion amount of the protrusion adjusting mechanism 23 is equal to the compression amount of the spring 2241. Then, the expansion and contraction amount D of the elastic expansion and contraction mechanism 224 obtained is compared with the movement amount X of the protrusion adjusting mechanism 23 protruding from the surface of the support shaft 21 in the above step to verify the X value obtained in the above step. If X=D, it proves that the second ball pressing groove 223 is in place and can apply a pressure F corresponding to the qualified rate of the powder to the powder. At this time, the ball press machine can be started to manufacture magnesium balls.

[0074] This step specifically requires the following work:

[0075] The distance L between a pair of first ball pressing grooves 221 forming the first ball pressing space at the first position is obtained according to the preparation parameters of the ball pressing structure 20 . Theoretically, this value is fixed.

[0076] Combined with the structure of the above-mentioned ball press machine and the control method of the ball press structure 20 in the magnesium ball preparation method, adaptive adjustment of the ball press machine before preparing magnesium balls can achieve beneficial effects such as improving ball pressing quality and ball pressing efficiency, reducing resource waste, and reducing production costs.

[0077] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation methods of the present application. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A ball pressing structure that is conducive to the preparation of magnesium balls, It is characterized in that The present invention also provides a method for activating a plurality of first ball pressing grooves on the outer surface of the ball pressing roller, and a plurality of second ball pressing grooves are movably arranged in the first ball pressing grooves. A through hole is arranged at the bottom of the first ball pressing grooves along the radial direction of the ball pressing roller, and an elastic telescopic mechanism is arranged in the through hole. One end of the elastic telescopic mechanism is connected with the second ball pressing groove, and the other end is movably matched with the side surface of the support shaft. A protruding adjustment mechanism is symmetrically arranged at a first position on the side surface of the support shaft along the axial direction of the support shaft. When the pair of ball pressing rollers rotate relative to each other to the first position around the support shaft, at least one pair of the first ball pressing grooves meet and form a first ball pressing space. In the first ball pressing space, at least part of the protruding adjustment mechanism protrudes from the surface of the support shaft and drives the elastic telescopic mechanism to move relatively, so that the second ball pressing grooves form a second ball pressing space.

2. The ball pressing structure according to claim 1, It is characterized in that The elastic telescopic mechanism includes a spring and a driving rod. A stop protrusion is provided on one side of the through hole adjacent to the first ball pressure groove. One end of the driving rod passes through the through hole and is connected to the second ball pressure groove, and the other end is provided with a sliding protrusion. The spring is arranged around the driving rod between the stop protrusion and the sliding protrusion, and at least a part of the sliding protrusion is slidably or rollingly connected to the surface of the support shaft.

3. The ball pressing structure according to claim 2, It is characterized in that The sliding protrusion is a sphere or a wheel, and a fork is provided at one end of the driving rod away from the second ball pressing groove, and the sliding protrusion is rollably connected to the fork.

4. The ball pressing structure according to claim 1, It is characterized in that The protrusion adjustment mechanism includes several groups of automatic telescopic rods and a first flange, which are located at the first position. A mounting groove is axially arranged on the side surface of the support shaft, and the depth direction of the mounting groove extends radially along the support shaft. Several groups of automatic telescopic rods are evenly distributed in the mounting groove along the axial direction of the support shaft, and the telescopic end of the automatic telescopic rod is fixedly connected to the first flange. The automatic telescopic rod is used to drive the first flange to move radially along the support shaft.

5. The ball pressing structure according to claim 4, It is characterized in that The support shaft includes a pillar and an elastic sleeve, which is located at the first position. The mounting groove is arranged on the surface of the pillar along the axial direction of the pillar. The elastic sleeve is arranged on the surface of the pillar along the circumferential direction of the pillar. The end of the first flange facing away from the automatic telescopic rod is in cooperation and contact with the inner surface of the elastic sleeve; the end of the elastic telescopic mechanism facing away from the second ball pressing groove is in cooperation and contact with the outer surface of the elastic sleeve.

6. The ball pressing structure according to claim 5, It is characterized in that The side surface of the pillar is separated from the mounting groove and a plurality of second flanges are arranged along the axial direction of the pillar, and the plurality of second flanges are distributed at intervals along the rotation direction of the ball pressing roller.

7. A ball press machine, It is characterized in that It comprises a shell and a ball pressing structure as described in any one of claims 1 to 6, wherein the ball pressing structure is arranged in the shell, a feed port is arranged at the upper portion of the shell, a discharge port is arranged at the lower portion of the shell, and in the shell, the feed port and the discharge port form a discharge channel along the direction of gravity, and a pair of support shafts are symmetrically fixed between the feed port and the discharge port with the extension direction of the discharge channel as the symmetry axis.

8. The ball press machine according to claim 7, It is characterized in that It also includes a driving mechanism, which includes a motor, a pair of main driving gears and a pair of planetary gear sets, the planetary gear set includes a planet carrier and a gear ring, the gear rings are respectively coaxially fixedly connected to one end of the ball pressing roller, the planet carrier is fixedly connected to the support shaft, and a sun gear is rotatably arranged at the center of the planet carrier, a plurality of planetary gears are rotatably arranged on the planet carrier around the circumference of the sun gear, and the planetary gears, the sun gear and the gear ring are meshed with each other; The pair of main driving gears are respectively coaxially connected to the pair of sun gears and mesh with each other. The motor is connected to any one of the pair of main driving gears, and the motor is used to drive the main driving gears to rotate.

9. The ball press machine according to claim 8, It is characterized in that The driving mechanism also includes a belt, a first pulley and a second pulley, the first pulley is connected to the driving shaft of the motor, the second pulley is coaxially connected to any one of the main driving gears, and the belt is sleeved on the first pulley and the second pulley.

10. A method for preparing magnesium balls, It is characterized in that The ball press machine according to any one of claims 7 to 9 specifically comprises the following steps: S10. Establishing a corresponding database based on the particle size qualification rate of the powder, the pressure value of the ball pressing roller, and the distance value between a pair of the second ball pressing grooves when the second ball pressing space is formed; S20. Obtain the particle size qualification rate of the powder, obtain the pressure value of the ball pressing roller based on the database, and obtain the movement amount of the protrusion adjustment mechanism protruding from the surface of the support shaft based on the formula X=F / K, wherein F represents the pressure value of the ball pressing roller, K represents the elastic coefficient of the elastic telescopic mechanism, and X represents the movement amount of the protrusion adjustment mechanism protruding from the surface of the support shaft; S30. Based on the movement amount of the protrusion adjustment mechanism protruding from the support shaft surface, the protrusion adjustment mechanism is controlled to drive so that the pressure value between a pair of the second ball pressing grooves meeting at the first position reaches the pressure value of the ball pressing roller; S40. Based on the database and the qualified rate of the particle size of the powder, the distance value between a pair of the second ball pressing grooves when forming the second ball pressing space is obtained, the expansion and contraction amount of the elastic telescopic mechanism is calculated based on the formula D=(Ls) / 2, and the movement amount of the protruding adjustment mechanism protruding from the support shaft surface is reviewed based on the expansion and contraction amount of the elastic telescopic mechanism to determine whether the two values ​​are equal. If the two values ​​are equal, the ball press machine is started to manufacture magnesium balls, wherein D represents the expansion and contraction amount of the elastic telescopic mechanism, L represents the distance value between a pair of the first ball pressing grooves meeting at the first position, and S represents the distance value between a pair of the second ball pressing grooves when forming the second ball pressing space.

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