Ore vibration screening equipment

Abstract

The invention discloses ore vibration screening equipment, and relates to the technical field of ore production. The device comprises a material box, the material box is provided with a plurality of material collecting chambers which are arranged side by side; a linear driving mechanism is horizontally arranged on the side wall of the material box; the driving direction of the linear driving mechanism is parallel to the arrangement direction of the multiple material collecting cavities. A vibrating mechanism is vertically arranged on the linear driving mechanism; a rotary driving mechanism is horizontally arranged on the vibrating mechanism; the rotary driving mechanism is horizontally connected with a screening box; the material screening box is arranged above the material box; a plurality of screening holes are evenly formed in the multiple side walls of the screening box correspondingly, and the diameters of the screening holes in every two adjacent side walls of the screening box are different. The ore screening device is reasonable in structural design and convenient to use, and the ore screening efficiency and effect are effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of ore production, and particularly relates to an ore vibrating screening device. Background Art

[0002] Ores contain important metal resources, which can be applied in engineering fields such as the metallurgical industry, chemical industry, and construction industry after being processed by crushing, grinding, etc. After the ores are crushed, due to the different sizes of ore particles, it is often necessary to screen and classify the ores.

[0003] Chinese Patent with the authorization announcement number CN222020043U discloses an ore classification screening device. The ore enters the interior of the screening box through the feed port, and the output rod is driven to work by the vibration motor, so that the screening box vibrates, and the classification screening of the ore is realized through the first sieve plate, the second sieve plate, and the third sieve plate. The above device has the following drawbacks: During the screening process of the ore by the sieve plate of the above device, the ore may get stuck in the sieve holes of the sieve plate, thereby affecting the use effect of the sieve plate and resulting in a decrease in the classification screening efficiency of the ore. Therefore, it is urgent to study an ore vibrating screening device to solve the above problems. Summary of the Invention

[0004] The present invention aims to provide an ore vibrating screening device, and its purpose is to solve the technical problems proposed in the above background art.

[0005] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0006] The present invention is an ore vibrating screening device, including a material box with an open upper structure; the material box has a plurality of aggregate chambers arranged side by side; a linear drive mechanism is horizontally installed on the side wall of the material box; the driving direction of the linear drive mechanism is parallel to the arrangement direction of the plurality of aggregate chambers; a vibration mechanism is vertically installed on the linear drive mechanism; a rotary drive mechanism is horizontally installed on the vibration mechanism; a screening box is horizontally connected to the rotary drive mechanism; the screening box is arranged above the material box; a plurality of sieve holes are respectively and uniformly opened on the plurality of side walls of the screening box, and the diameters of the sieve holes on the adjacent two side walls of the screening box are different.

[0007] As a preferred technical solution of the present invention, the linear drive mechanism includes a guide rod and a screw rod horizontally arranged on opposite sides of the material box respectively; the length directions of the guide rod and the screw rod are both parallel to the arrangement direction of the plurality of aggregate chambers; both ends of the guide rod and both ends of the screw rod are rotatably connected with first mounting blocks; the two pairs of first mounting blocks are respectively fixed on the opposite side walls of the material box; a slider is slidably connected to the guide rod; a transmission block is threadedly connected to the screw rod; a first belt pulley is fixedly sleeved on one end of the screw rod; the first belt pulley is connected to a second belt pulley through a synchronous belt; the second belt pulley is fixedly sleeved on the output shaft of a first motor; the first motor is horizontally fixed on the bottom wall of the material box.

[0008] As a preferred technical solution of the present invention, the vibration mechanism includes a pair of support plates horizontally fixed on the slider and the transmission block respectively; vibration plates are horizontally arranged above the two support plates; a plurality of limit columns are vertically fixed on the upper surfaces of the two support plates; the upper ends of the plurality of limit columns are respectively slidably inserted through the two vibration plates; a first spring is sleeved on the outer circumference of each of the plurality of limit columns, and the upper and lower ends of each first spring are respectively fixed on the support plate and the vibration plate; mounting plates are vertically fixed on the upper surfaces of the two vibration plates; vibration motors are fixed on the opposite outer sides of the two mounting plates.

[0009] As a preferred technical solution of the present invention, the rotary drive mechanism includes a pair of bearing plates vertically fixed on the upper surfaces of the two vibration plates; the two bearing plates are arranged between the two mounting plates; a rotary cylinder is inserted through the opposite side surfaces of the two bearing plates, and the two rotary cylinders are respectively rotatably connected with the two bearing plates; the two rotary cylinders are coaxially arranged; the opposite inner ends of the two rotary cylinders are respectively fixedly inserted through the opposite side walls of the screening box; an external toothed ring is fixedly sleeved on the outer circumference of one rotary cylinder; a gear is meshed with the external toothed ring; the gear is fixedly sleeved on the output shaft of a second motor; the second motor is horizontally fixed on one bearing plate.

[0010] As a preferred technical solution of the present invention, a feeding mechanism is connected to the screening box; the feeding mechanism includes a pair of feeding hoppers vertically fixed on the upper parts of the two mounting plates respectively; the bottoms of the two feeding hoppers both have inclined feeding channels; the lower ends of the two feeding channels are respectively arranged inside the two rotary cylinders; a retaining disc coaxial with the rotary cylinder is vertically fixed at the outlet end of each of the two feeding channels; the two retaining discs are respectively arranged inside the two rotary cylinders; the horizontal positions of the outlet ends of the two feeding channels are both higher than the horizontal position of the central axis of the rotary cylinder; the retaining disc is in rotational fit or clearance fit with the rotary cylinder.

[0011] As a preferred technical solution of the present invention, a positioning mechanism for restricting the rotation of the screening box is connected to the other rotating cylinder; the positioning mechanism is installed on a feed hopper; the positioning mechanism includes a connecting ring fixedly sleeved on the outer periphery of the other rotating cylinder and a second mounting block arranged above the connecting ring; a plurality of accommodating grooves are uniformly arranged on the outer side surface of the connecting ring; the plurality of accommodating grooves correspond to the plurality of side walls of the screening box one by one; the second mounting block is fixed on a side wall of a feed hopper; a movable column is vertically slidably inserted through the second mounting block; a second spring is sleeved on the outer periphery of the movable column; the upper and lower ends of the second spring are respectively fixed on the lower surface of the second mounting block and the outer wall of the movable column; a positioning block corresponding to the accommodating groove is vertically fixed at the lower end of the movable column; the positioning block can be slidably inserted into any one of the accommodating grooves; an iron sheet is horizontally fixed at the upper end of the movable column; an electromagnet is arranged above the iron sheet; the electromagnet is fixed on a side wall of a feed hopper.

[0012] The present invention has the following beneficial effects:

[0013] In the present invention, the ore is fed into the material box, and then the linear driving mechanism is used to drive the screening box to move above any one of the collecting chambers. Then, the vibration mechanism drives the screening box to vibrate up and down, so that the ore in the screening box is screened out through the sieve holes at the bottom thereof and falls into a collecting chamber below the screening box. When it is necessary to adjust the screening size of the ore, first pause the vibration mechanism, and then drive the screening box to rotate 90 degrees through the rotary driving mechanism to realize the switching of the sieve holes on the screening box. Then, use the linear driving mechanism to drive the screening box to move above the next collecting chamber, and finally continue to drive the screening box to vibrate up and down through the vibration mechanism, so as to realize the screening process of ores of different sizes. Moreover, when the ore stuck in the sieve hole is rotated to the upper part of the screening box, with the vibration of the screening box, the ore will fall back into the screening box again, which not only effectively improves the screening efficiency and effect of the ore, but also avoids problems such as the ore being stuck in the sieve hole.

[0014] Of course, it is not necessary for any product implementing the present invention to simultaneously achieve all the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of an ore vibration screening device of the present invention.

[0017] Figure 2 ForFigure 1 Front view of the structure

[0018] Figure 3 Schematic diagram of the structure of the linear drive mechanism of the present invention provided on the material box

[0019] Figure 4 Schematic diagram of the connection structure among the linear drive mechanism, vibration mechanism, rotary drive mechanism, screening box and feeding mechanism of the present invention

[0020] Figure 5 Schematic diagram of the connection structure among the rotary drive mechanism, screening box and feeding mechanism of the present invention

[0021] Figure 6 Schematic diagram of the structure of the screening box of the present invention

[0022] Figure 7 Schematic diagram of the connection structure between the feeding mechanism and the positioning mechanism of the present invention

[0023] Figure 8 Schematic diagram of the structure of the positioning mechanism of the present invention

[0024] In the accompanying drawings, the list of components represented by each reference numeral is as follows:

[0025] 1 - Material box, 2 - Linear drive mechanism, 3 - Vibration mechanism, 4 - Rotary drive mechanism, 5 - Screening box, 6 - Feeding mechanism, 7 - Positioning mechanism, 101 - Aggregate chamber, 102 - Discharge port, 201 - Guide rod, 202 - Screw, 203 - First mounting block, 204 - Slide block, 205 - Transmission block, 206 - First pulley, 207 - Second pulley, 208 - First motor, 301 - Support plate, 302 - Vibration plate, 303 - Limit post, 304 - First spring, 305 - Mounting plate, 306 - Vibration motor, 401 - Bearing plate, 402 - Rotating cylinder, 403 - External toothed ring, 404 - Gear, 405 - Second motor, 501 - Sieve hole, 601 - Feeding hopper, 602 - Feeding channel, 603 - Baffle plate, 701 - Connecting ring, 702 - Second mounting block, 703 - Accommodation groove, 704 - Movable column, 705 - Second spring, 706 - Positioning block, 707 - Iron sheet, 708 - Electromagnet Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1:

[0028] Please refer to Figure 1-2 As shown, the present invention is an ore vibrating screening device, including a hopper 1 with an open structure at the upper part; the hopper 1 has four aggregate chambers 101 arranged side by side, and each lower part of the aggregate chamber 101 has a discharge port 102; a linear driving mechanism 2 is horizontally installed on the side wall of the hopper 1; the driving direction of the linear driving mechanism 2 is parallel to the arrangement direction of the multiple aggregate chambers 101; a vibrating mechanism 3 is vertically installed on the linear driving mechanism 2; a rotary driving mechanism 4 is horizontally installed on the vibrating mechanism 3; a screening box 5 with a cuboid structure is horizontally connected to the rotary driving mechanism 4, and the cross-section of the screening box 5 perpendicular to the length direction is a square structure; the screening box 5 is arranged above the hopper 1; a plurality of screening holes 501 are evenly distributed on the four side walls of the screening box 5, and the diameters of the screening holes 501 on the adjacent two side walls of the screening box 5 are different, that is, the diameters of the screening holes 501 on the four side walls of the screening box 5 gradually increase. During use, by feeding the ore into the hopper 1, then using the linear driving mechanism 2 to drive the screening box 5 to move above any one of the aggregate chambers 101, and then driving the screening box 5 to vibrate up and down through the vibrating mechanism 3, so that the ore in the screening box 5 is screened out through the screening holes 501 at its bottom and falls into an aggregate chamber 101 below the screening box 5. When it is necessary to adjust the screening size of the ore, first pause the vibrating mechanism 3, then drive the screening box 5 to rotate 90 degrees through the rotary driving mechanism 4 to realize the switching of the screening holes 501 on the screening box 5, then use the linear driving mechanism 2 to drive the screening box 5 to move above the next aggregate chamber 101, and finally continue to drive the screening box 5 to vibrate up and down through the vibrating mechanism 3, so as to realize the screening treatment of ores of different sizes. And when the ore stuck in the screening holes 501 is rotated to the upper part of the screening box 5, with the vibration of the screening box 5, the ore will fall back into the screening box 5 again, which not only effectively improves the screening efficiency and effect of the ore, but also avoids problems such as the ore getting stuck in the screening holes 501.

[0029] Among them, such as Figure 3-4As shown in the figure, the linear drive mechanism 2 includes a guide rod 201 and a screw rod 202 that are horizontally arranged on opposite sides of the material box 1 respectively; the length directions of the guide rod 201 and the screw rod 202 are both parallel to the arrangement direction of the multiple aggregate chambers 101; both ends of the guide rod 201 and both ends of the screw rod 202 are rotatably connected with first mounting blocks 203; the two pairs of first mounting blocks 203 are respectively bolted to the opposite side walls of the material box 1; a slider 204 is slidably connected to the guide rod 201; a transmission block 205 is threadedly connected to the screw rod 202; one end of the screw rod 202 is key-connected with a first belt pulley 206; the first belt pulley 206 is connected to a second belt pulley 207 through a synchronous belt; the second belt pulley 207 is key-connected to the output shaft of a first motor 208; the first motor 208 is horizontally bolted to the bottom wall of the material box 1. During use, the screw rod 202 is driven to rotate by the first motor 208 through the second belt pulley 207 and the first belt pulley 206, so that the screening box 5 moves linearly along the arrangement direction of the multiple aggregate chambers 101, thereby realizing that the screening box 5 moves into different aggregate chambers 101, and further realizing the classification and collection of ores of different sizes, effectively ensuring the screening efficiency of the ores.

[0030] As shown in Figure 4 the figure, the vibration mechanism 3 includes a pair of support plates 301 that are horizontally bolted to the slider 204 and the transmission block 205 respectively; vibration plates 302 are horizontally arranged above the two support plates 301; a plurality of limit columns 303 are vertically bolted to the upper surfaces of the two support plates 301; the upper ends of the plurality of limit columns 303 are respectively slidably inserted through the two vibration plates 302; a first spring 304 is sleeved on the outer periphery of each of the plurality of limit columns 303, and the upper and lower ends of each first spring 304 are respectively bolted to the support plate 301 and the vibration plate 302; mounting plates 305 are vertically bolted to the upper surfaces of the two vibration plates 302; conventional vibration motors 306 in the art are bolted to the opposite outer sides of the two mounting plates 305. During use, the vibration plates 302 are driven to rotate up and down by the vibration motors 306 through the mounting plates 305, thereby realizing the vibration of the screening box 5, effectively ensuring the screening efficiency of the ores.

[0031] Embodiment 2:

[0032] On the basis of Embodiment 1, as shown in Figure 4-6As shown in the figure, the rotation drive mechanism 4 includes a pair of bearing plates 401 vertically bolted to the upper surfaces of the two vibrating plates 302; the two bearing plates 401 are arranged between the two mounting plates 305; the opposite sides of the two bearing plates 401 are each inserted with a rotating cylinder 402, and the two rotating cylinders 402 are respectively rotatably connected to the two bearing plates 401; the two rotating cylinders 402 are coaxially arranged; the opposite inner ends of the two rotating cylinders 402 are fixedly inserted into the opposite side walls of the screening box 5, that is, the inside of the rotating cylinder 402 is communicated with the inside of the screening box 5; an external gear ring 403 is key-connected to the outer circumference of a rotating cylinder 402; a gear 404 meshes with the external gear ring 403; the gear 404 is key-connected to the output shaft of a second motor 405; the second motor 405 is horizontally bolted to a bearing plate 401. When in use, the second motor 405 drives the external gear ring 403 to rotate through the gear 404, so as to realize the rotation of the rotating cylinder 402 driving the screening box 5, and the screening box 5 rotates 90 degrees each time, thereby realizing the switching of the screening holes 501 with different diameters.

[0033] Among them, as Figure 4-7 shown, a feeding mechanism 6 is connected to the screening box 5; the feeding mechanism 6 includes a pair of feeding hoppers 601 respectively vertically bolted to the upper parts of the two mounting plates 305; the bottoms of the two feeding hoppers 601 each have an inclined feeding channel 602; the lower ends of the two feeding channels 602 are respectively arranged inside the two rotating cylinders 402; the outlet ends of the two feeding channels 602 are vertically welded with a retaining plate 603 coaxially arranged with the rotating cylinder 402; the two retaining plates 603 are respectively arranged inside the two rotating cylinders 402; the horizontal positions of the outlet ends of the two feeding channels 602 are higher than the horizontal position of the central axis of the rotating cylinder 402; the retaining plate 603 is in clearance fit with the rotating cylinder 402. When in use, by putting the ore into the feeding hopper 601, the ore in the feeding hopper 601 is then sent into the screening box 5 through the feeding channel 602, effectively ensuring the feeding efficiency of the ore; at the same time, by designing the horizontal position of the outlet end of the feeding channel 602 to be higher than the horizontal position of the central axis of the rotating cylinder 402, it can avoid the ore in the screening box 5 from blocking the outlet end of the feeding channel 602, effectively ensuring the feeding effect of the ore.

[0034] Embodiment 3:

[0035] On the basis of Embodiment 2, as Figure 2 and Figure 6-8As shown in the figure, a positioning mechanism 7 for restricting the rotation of the screening box 5 is connected to another rotary drum 402; the positioning mechanism 7 is installed on a feed hopper 601; the positioning mechanism 7 includes a connecting ring 701 key-connected to the outer periphery of the other rotary drum 402 and a second mounting block 702 arranged above the connecting ring 701; four accommodating grooves 703 with an inverted isosceles trapezoid structure are evenly arranged on the outer side surface of the connecting ring 701; the four accommodating grooves 703 correspond to the four side walls of the screening box 5 one by one; the second mounting block 702 is bolted to a side wall of a feed hopper 601; a movable column 704 is vertically slidably inserted through the second mounting block 702; a second spring 705 is sleeved on the outer periphery of the movable column 704; the upper and lower ends of the second spring 705 are respectively bolted to the lower surface of the second mounting block 702 and the outer wall of the movable column 704; a positioning block 706 corresponding to the accommodating groove 703 is vertically bolted to the lower end of the movable column 704; the positioning block 706 has an inverted isosceles trapezoid structure; the positioning block 706 can be slidably inserted into any one of the accommodating grooves 703; a iron sheet 707 is horizontally bolted to the upper end of the movable column 704; a conventional electromagnet 708 in the art is arranged above the iron sheet 707; the electromagnet 708 is bolted to a side wall of a feed hopper 601. During use, when it is necessary to rotate the screening box 5, the electromagnet 708 is started to attract the iron sheet 707, so that the positioning block 706 is separated from the accommodating groove 703. Then, after the screening box 5 is rotated, the electromagnet 708 is turned off, and under the elastic action of the second spring 705, the positioning block 706 is inserted into the accommodating groove 703 below it, so as to realize the position locking of the screening box 5. This not only avoids problems such as random rotation of the screening box 5 during vibration, but also ensures the vibration stability of the screening box 5, effectively guaranteeing the screening effect of the ore.

[0036] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A vibrating ore screening device, characterized in that: It comprises a material box (1) with an open structure at the top; the material box (1) has a plurality of material collecting chambers (101) arranged side by side; A linear drive mechanism (2) is horizontally mounted on the side wall of the material box (1); the driving direction of the linear drive mechanism (2) is arranged in parallel with the arrangement direction of the plurality of material collecting chambers (101); a vibration mechanism (3) is vertically mounted on the linear drive mechanism (2); a rotary drive mechanism (4) is horizontally mounted on the vibration mechanism (3); a screening box (5) is horizontally connected to the rotary drive mechanism (4); the screening box (5) is arranged above the material box (1); a plurality of side walls of the screening box (5) are respectively and evenly provided with a plurality of screening holes (501), and the diameters of the screening holes (501) on two adjacent side walls of the screening box (5) are different.

2. The ore vibration screening equipment according to claim 1, characterized in that: The linear drive mechanism (2) comprises a guide rod (201) and a screw rod (202) respectively arranged horizontally on opposite sides of the material box (1); the length direction of the guide rod (201) and the length direction of the screw rod (202) are both arranged parallel to the arrangement direction of the plurality of material collection chambers (101); both ends of the guide rod (201) and both ends of the screw rod (202) are rotatably connected to a first mounting block (203); two pairs of the first mounting blocks (203) are respectively fixed on opposite sides of the material box (1); The guide rod (201) is slidably connected to a slider (204); the screw rod (202) is threadedly connected to a transmission block (205); one end of the screw rod (202) is fixedly sleeved with a first pulley (206); the first pulley (206) is connected to a second pulley (207) through a synchronous belt drive; the second pulley (207) is fixedly sleeved on an output shaft of a first motor (208); the first motor (208) is horizontally fixed to the bottom wall of the material box (1).

3. The ore vibration screening equipment according to claim 2, characterized in that: The vibration mechanism (3) comprises a pair of support plates (301) respectively fixed horizontally on the slider (204) and the transmission block (205); a vibration plate (302) is horizontally arranged above the two support plates (301); a plurality of limit columns (303) are vertically fixed on the upper surfaces of the two support plates (301); the upper ends of the plurality of limit columns (303) are respectively slidably inserted on the two vibration plates (302); the outer peripheries of the plurality of limit columns (303) are sleeved with first springs (304), and the upper and lower ends of each of the first springs (304) are respectively fixed on the support plate (301) and the vibration plate (302); a mounting plate (305) is vertically fixed on the upper surfaces of the two vibration plates (302); and a vibration motor (306) is fixed on the opposite outer sides of the two mounting plates (305).

4. The ore vibration screening equipment according to claim 3, characterized in that: The rotary drive mechanism (4) comprises a pair of supporting plates (401) vertically fixed on the upper surfaces of the two vibration plates (302); the two supporting plates (401) are arranged between the two mounting plates (305); rotating cylinders (402) are inserted on the opposite sides of the two supporting plates (401), and the two rotating cylinders (402) are respectively rotatably connected to the two supporting plates (401); the two rotating cylinders (402) are coaxially arranged; the opposite inner ends of the two rotating cylinders (402) are fixedly inserted on the opposite side walls of the screening box (5); an outer toothed ring (403) is fixedly sleeved on the outer periphery of one of the rotating cylinders (402); a gear (404) is meshed on the outer toothed ring (403); the gear (404) is fixedly sleeved on the output shaft of a second motor (405); the second motor (405) is horizontally fixed on a supporting plate (401).

5. The ore vibration screening equipment according to claim 4, characterized in that: The screening box (5) is connected to a feeding mechanism (6); the feeding mechanism (6) comprises a pair of feeding hoppers (601) respectively fixed vertically to the upper parts of two mounting plates (305); the bottoms of the two feeding hoppers (601) are provided with inclined feeding channels (602); the lower ends of the two feeding channels (602) are respectively arranged on the inner sides of the two rotating drums (402); the outlet ends of the two feeding channels (602) are vertically fixed with baffle plates (603) coaxially arranged with the rotating drum (402); the two baffle plates (603) are respectively arranged on the inner sides of the two rotating drums (402).

6. The ore vibration screening equipment according to claim 5, characterized in that: The horizontal positions of the outlet ends of the two feed channels (602) are both higher than the horizontal position of the central axis of the rotating drum (402); the baffle plate (603) and the rotating drum (402) are rotationally matched or clearance matched.

7. A vibrating ore screening device according to claim 5 or 6, characterized in that: The other rotating drum (402) is connected with a positioning mechanism (7) for limiting the rotation of the screening box (5); the positioning mechanism (7) is installed on a feed hopper (601).

8. The ore vibration screening equipment according to claim 7, characterized in that: The positioning mechanism (7) comprises a connecting ring (701) fixedly sleeved on the outer periphery of another rotating drum (402) and a second mounting block (702) arranged above the connecting ring (701); a plurality of accommodating grooves (703) are evenly distributed on the outer side surface of the connecting ring (701); the plurality of accommodating grooves (703) correspond one by one to a plurality of side walls of the screening box (5); the second mounting block (702) is fixed on a side wall of a feed hopper (601); a movable column (704) is vertically slidably inserted on the second mounting block (702); a second spring is sleeved on the outer periphery of the movable column (704); (705); the upper and lower ends of the second spring (705) are respectively fixed to the lower surface of the second mounting block (702) and the outer wall of the movable column (704); a positioning block (706) corresponding to the receiving groove (703) is vertically fixed to the lower end of the movable column (704); the positioning block (706) can be slidably inserted into any receiving groove (703); an iron sheet (707) is horizontally fixed to the upper end of the movable column (704); an electromagnet (708) is arranged above the iron sheet (707); the electromagnet (708) is fixed to a side wall of a feed hopper (601).

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