Polishing equipment for metal button production
By designing a metal button polishing device including a base, a mixing bucket, a turntable and an eccentric vibration component, the problem of low polishing efficiency of traditional vibration polishing equipment is solved, and efficient polishing of the metal button surface is achieved, and the smoothness and production efficiency of the product are improved.
Patent Information
- Application Number
- CN202421899540.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-07
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-08-07
AI Technical Summary
In the prior art, the polishing efficiency of metal buttons is low by using traditional vibration polishing equipment, and the flow rate of polishing particles is slow, resulting in low polishing and polishing efficiency.
A polishing device is designed including a base, a mixing bucket, a turntable and an eccentric vibration assembly. By mixing metal buttons and polishing particles in the mixing drum, the rotary rotating drives the eccentric vibration component and the mixing drum to rotate. The eccentric vibration component drives the mixing drum to vibrate up and down, so that the polishing particles and metal buttons flow and roll at high speed, achieving efficient polishing.
Through the contact collision between the high-speed flowing and rolling polishing particles and the metal buttons, the polishing efficiency of the metal buttons is significantly improved, making the surface smooth and smooth.
Smart Images
Figure CN222874192U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of button production, and more specifically, to a polishing device for metal button production. Background Art
[0002] In ancient Rome, buttons were originally used as decorations, while brooches were used to fasten clothes. In the 13th century, buttons played the same role as they do today. At that time, people knew how to make buttonholes on clothes, which greatly improved the practical value of buttons. In the 16th century, buttons became popular. With the rise of fast fashion, buttons have changed from functional to creative. In the production process of buttons, semi-finished products need to be polished and polished to remove burrs on the surface and make them smooth and flat.
[0003] In the related art, a vibration polishing device is usually used for three-dimensional polishing of buttons. A vibration polishing machine is a kind of commonly used polishing equipment, which generally includes a machine base and a can-shaped vibrating member connected to the machine base. The top of the vibrating member has a grinding chamber. The vibrating member is driven by a motor with an eccentric structure to realize power and eccentrically swing in the horizontal direction. When polishing is required, the polishing particles are poured into the grinding chamber and a batch of products to be polished are placed in the grinding chamber and immersed in the polishing particles. The polishing particles are made to flow and tumble through the work of the vibration disk, and the metal buttons to be polished are polished during the flow and tumbling of the polishing particles.
[0004] With respect to the above-mentioned related technologies, the eccentric swing of the vibrating member in the horizontal direction is achieved by a motor in conjunction with an eccentric structure. Although the polishing particles are flowing, the actual flow rate is relatively slow, so the polishing efficiency is also relatively low. Utility Model Content
[0005] In order to solve the problem of low polishing efficiency of metal buttons using traditional vibration polishing equipment in the related art, the present application provides a polishing equipment for metal button production.
[0006] A polishing device for producing metal buttons comprises a base and a mixing barrel, wherein the base is rotatably provided with a turntable and a rotation driving assembly for driving the turntable to rotate, an eccentric vibration assembly is provided on the top surface of the turntable, the eccentric vibration assembly is connected to the mixing barrel to fix the mixing barrel and drive the mixing barrel to vibrate up and down, and the rotation driving assembly drives the turntable to rotate, causing the eccentric vibration assembly and the mixing barrel to rotate on the same axis.
[0007] By adopting the above technical scheme, the metal buttons and polishing particles are mixed and placed in a mixing barrel. The rotation of the turntable drives the eccentric vibration component and the mixing barrel to rotate. The eccentric vibration component drives the mixing barrel to vibrate up and down, so that the polishing particles and metal buttons in the mixing barrel flow and tumble at high speed. The polishing particles contact and collide with the metal buttons to achieve surface grinding and polishing of the metal buttons, deburring and polishing of the metal buttons. On the basis of the eccentric vibration of the mixing barrel, the mixing barrel is driven to rotate by the turntable, so that the polishing particles and metal buttons are tossed up and down and rotate at the same time. The flow rate of the two is faster and the collision is more intense, thereby accelerating the grinding and polishing efficiency of the metal buttons.
[0008] Preferably, the rotation drive assembly includes a main shaft, a first servo motor and a first transmission structure. The main shaft is arranged upright and is rotatably connected to the base. The top end of the main shaft is connected and fixed to the bottom surface of the turntable. The first servo motor is fixed on the base and drives the main shaft to rotate through the first transmission structure.
[0009] By adopting the above technical solution, the first servo motor drives the main shaft to rotate through the first transmission structure, and the rotation of the main shaft drives the turntable to rotate. The servo motor is not directly connected to the main shaft and is not easily damaged.
[0010] Preferably, the eccentric vibration assembly includes a bearing seat, a rotating shaft, a second servo motor, a second transmission structure, a fixed plate, a sliding sleeve, a sliding rod, and a tension spring. The number of the bearing seats is two, one end of the rotating shaft is connected to one of the bearing seats, and the other end of the rotating shaft is connected to the other bearing seat. The rotating shaft is supported to rotate by the bearing seat, and a cam is arranged on the rotating shaft. The second servo motor is fixed on the turntable and drives the rotating shaft to rotate through the second transmission structure. The number of the sliding sleeves is at least two, and a plurality of the sliding sleeves are upright and fixed on the top of the turntable. The number of sliding rods matches the number of sliding sleeves, a sliding rod slides in the inner hole of each sliding sleeve, the top ends of the plurality of sliding rods are connected and fixed to the fixed plate, the fixed plate is slidably supported by the sliding sleeve and the sliding rods, a roller seat is provided on the bottom surface of the fixed plate, a roller is rotatably provided on the roller seat, the outer periphery of the roller abuts against the outer periphery of the cam, one end of the tension spring is connected and fixed to the turntable, the other end of the tension spring is connected and fixed to the fixed plate, a locking assembly is provided on the fixed plate, and the mixing barrel is fixed to the top surface of the fixed plate by the locking.
[0011] By adopting the above technical scheme, the second servo motor drives the rotating shaft to rotate, the rotation of the rotating shaft drives the cam to rotate eccentrically, the eccentric rotation of the cam drives the roller to vibrate up and down, the roller acts on the fixed plate through the roller seat to realize the up and down vibration of the fixed plate and drive the mixing barrel to vibrate up and down, the sliding sleeve and the sliding rod are used to support the sliding of the fixed plate, so that the up and down vibration of the fixed plate is relatively stable, the tension spring is used to pull down the fixed plate to realize the roller always abutting against the cam so that the cam stably drives the roller to vibrate up and down, and the locking assembly fixes the mixing barrel to the top surface of the fixed plate to facilitate the removal of the mixing barrel and the unloading of the metal buttons.
[0012] Preferably, a groove is concavely provided on the top surface of the fixing plate, a protrusion matching the groove is convexly provided on the bottom surface of the mixing barrel, a threaded hole penetrating the groove is provided on the side wall of the fixing plate, the locking assembly includes a threaded rod and a rotating handle arranged at the end of the threaded rod, the side wall of the protrusion of the mixing barrel is provided with an opening matching the size of the threaded rod, the protrusion of the mixing barrel is inserted into the groove, the threaded rod is threadedly connected to the threaded hole and passes through the opening to fix the mixing barrel to the top surface of the fixing plate.
[0013] By adopting the above technical solution, the threaded rod is inserted into the opening of the protrusion to limit the mixing barrel to fix the mixing barrel, and the threaded rod is rotated to rotate the threaded rod out of the opening of the protrusion to remove the mixing barrel from the fixing plate, which is easy to use.
[0014] Preferably, it also includes a material frame and a shaking screen plate, the side wall of the base is recessed with a placement groove, the material frame is placed in the placement groove and opened upward, the top surface of the base is provided with a receiving groove at a position corresponding to the placement groove, the shaking screen plate is placed in the receiving groove to be supported, springs are provided between the two end walls of the shaking screen plate and the side walls of the receiving groove, one end of the spring is connected and fixed to the shaking screen plate, and the other end of the spring is connected and fixed to the side wall of the receiving groove, the top surface of the shaking screen plate is recessed with a material discharge groove, the bottom surface of the material discharge groove is provided with a plurality of material drop holes arranged in an array, and the base is provided with openings in the area of the receiving groove corresponding to the material drop holes to connect the material drop holes to the placement groove.
[0015] By adopting the above technical solution, metal buttons and polishing particles are poured into the discharge trough, and the size of the drop hole is set to be larger than the size of the polishing particles and smaller than the size of the metal buttons. By shaking the shaking screen plate, the polishing particles can be quickly dropped from the drop hole onto the material frame to separate the polishing particles and the metal buttons. The spring makes the shaking screen plate more stable.
[0016] In summary, the present application includes at least one of the following beneficial technical effects:
[0017] 1. Mix the metal buttons and polishing particles and place them in a mixing barrel. The rotation of the turntable drives the eccentric vibration component and the mixing barrel to rotate. The eccentric vibration component drives the mixing barrel to vibrate up and down, so that the polishing particles and metal buttons in the mixing barrel flow and roll at high speed. The polishing particles contact and collide with the metal buttons to polish the surface of the metal buttons. On the basis of the eccentric vibration of the mixing barrel, the mixing barrel is driven to rotate by the turntable, so that the polishing particles and metal buttons are tossed up and down and rotate at the same time. The flow rate of the two is faster and the collision is more intense, thereby accelerating the polishing efficiency of the metal buttons.
[0018] 2. The rotating shaft is driven to rotate by the second servo motor, and the rotation of the rotating shaft drives the cam to rotate eccentrically. The eccentric rotation of the cam drives the roller to vibrate up and down. The roller acts on the fixed plate through the roller seat to realize the up and down vibration of the fixed plate and drive the mixing barrel to vibrate up and down. The fixed plate is supported by the sliding sleeve and the sliding rod, so that the up and down vibration of the fixed plate is more stable. The tension spring is used to pull down the fixed plate to realize that the roller is always in contact with the cam, so that the cam stably drives the roller to vibrate up and down. The locking assembly fixes the mixing barrel to the top surface of the fixed plate to facilitate the removal of the mixing barrel and the unloading of the metal button.
[0019] 3. Pour the metal buttons and polishing particles into the discharge trough. The size of the drop hole is set to be larger than the size of the polishing particles and smaller than the size of the metal buttons. By shaking the shaking screen plate, the polishing particles can be quickly dropped from the drop hole onto the material frame to separate the polishing particles and the metal buttons. The spring makes the shaking screen plate more stable. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic structural diagram of a polishing device for producing metal buttons according to this embodiment.
[0021] Figure 2 It is a front view of a polishing device for producing metal buttons according to this embodiment.
[0022] Figure 3 This embodiment is a polishing device for metal button production. Figure 2 Cross-section of line A.
[0023] 1. Base; 11. Circular groove; 12. Support plate; 13. Turntable; 131. Connecting block; 14. Placement groove; 15. Accommodation groove; 2. Mixing barrel; 21. Bump; 3. Rotation drive assembly; 31. Main shaft; 32. First servo motor; 33. First transmission structure; 4. Eccentric vibration assembly; 41. Bearing seat; 42. Rotating shaft; 421. Cam; 43. Second servo motor; 44. Second transmission structure; 45. Fixed plate; 451. Roller seat; 452. Roller; 453. Locking assembly; 4531. Threaded rod; 4532. Rotating handle; 454. Groove; 455. Threaded hole; 46. Sliding sleeve; 47. Sliding rod; 48. Tension spring; 5. Material frame; 6. Shaking screen plate; 61. Discharge trough; 62. Dropping hole; 63. Pull handle; 7. Spring. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0025] Reference Figure 1-3 A polishing device for producing metal buttons comprises a base 1 and a mixing barrel 2. The base 1 is in a rectangular shape. A circular groove 11 is concavely provided on the top surface of the base 1 and a support plate 12 is provided in the circular groove 11 of the base 1. The support plate 12 is provided with a through hole and a bearing is fixed in the through hole. A turntable 13 is provided on the support plate 12. The bottom surface of the turntable 13 is supported by the top surface of the support plate 12. A connecting block 131 is provided on the bottom surface of the turntable 13. The connecting block 131 is connected to the bearing and the turntable 13 is supported to rotate by the bearing. A rotating drive component 3 is provided in the circular groove 11 to drive the turntable 13 to rotate. The top surface of the turntable 13 extends out of the circular groove 11 and is avoided by the circular groove 11, so as to reduce the overall height of the equipment. An eccentric vibration component 4 is provided on the top surface of the turntable 13. The eccentric vibration component 4 is connected and fixed to the mixing barrel 2 and drives the mixing barrel 2 to vibrate up and down. The rotation of the turntable 13 drives the eccentric vibration component 4 and the mixing barrel 2 to rotate on the same axis.
[0026] Reference Figure 3Furthermore, the rotation drive assembly 3 includes a main shaft 31, a first servo motor 32 and a first transmission structure 33. A bearing is also fixed to the bottom of the circular groove 11. The main shaft 31 is vertically arranged and its bottom end is connected to the bearing. The bearing supports the main shaft 31 to rotate. The first servo motor 32 is vertically fixed to the bottom of the circular groove 11 and its driving axis is axially upward. The first transmission structure 33 is preferably a combination of a pulley and a transmission belt. There are two pulleys, one is fixed on the driving shaft of the first servo motor 32, and the other is fixed on the main shaft 31. The transmission belt is sleeved on the two pulleys and driven by the first servo motor 32. The transmission belt drives the main shaft 31 to rotate. The first servo motor 32 is not directly connected to the main shaft 31 and is not easily damaged.
[0027] Reference Figure 1-3Furthermore, the eccentric vibration assembly 4 includes a bearing seat 41, a rotating shaft 42, a second servo motor 43, a second transmission structure 44, a fixing plate 45, a sliding sleeve 46, a sliding rod 47, and a tension spring 48. There are two bearing seats 41, which are symmetrically arranged on both sides of the center of the turntable 13. One end of the rotating shaft 42 is connected to one bearing seat 41, and the other end of the rotating shaft 42 is connected to another bearing seat 41. The rotating shaft 42 is supported to rotate by the bearing seat 41. The rotating shaft 42 is provided with a cam 421 at the center of the turntable 13. The second servo motor 43 is transversely fixed on the turntable 13 and drives the rotating shaft 42 to rotate through the second transmission structure 44. The second transmission structure 44 is the same as the first transmission structure 33, which is a combination of a pulley and a belt. No more details are given here. There are four sliding sleeves 46. The turntable 13 has two sliding sleeves 46 erected on both sides of the rotating shaft 42. There are also four sliding rods. A sliding rod 47 slides in the inner hole of each sliding sleeve 46. The top ends of the four sliding rods 47 are respectively connected and fixed to the four corners of the fixed plate 45. The fixed plate 45 is moved by the sliding sleeves 46 and the sliding rods 47. The sliding support is convenient for making the fixed plate 45 vibrate up and down more stably. The center of the fixed plate 45 is on the same vertical line as the center of the turntable 13. A roller seat 451 is provided at the center of the bottom surface of the fixed plate 45. A roller 452 is rotatably provided on the roller seat 451. The outer periphery of the roller 452 abuts against the outer periphery of the cam 421. There are two tension springs 48, which are respectively arranged at the two sides of the fixed plate 45. One end of the tension spring 48 is connected and fixed to the turntable 13, and the other end of the tension spring 48 is connected and fixed to the fixed plate 45. The rotating shaft 42 is rotated by the rotating shaft 42. The rotation drives the cam 421 to rotate eccentrically, and the eccentric rotation of the cam 421 drives the roller 452 to vibrate up and down. The roller 452 acts on the fixed plate 45 through the roller seat 451 to realize the up and down vibration of the fixed plate 45. The tension spring 48 is used to pull down the fixed plate 45 to realize that the roller 452 is always in contact with the cam 421 so that the cam 421 can stably drive the roller 452 to vibrate up and down. A locking component 453 is provided on the top of the fixed plate 45. The fixed plate 45 fixes the mixing barrel 2 to the top surface of the fixed plate 45 through the locking component 453, which makes it easy to remove the mixing barrel 2 and unload the metal buttons.
[0028] Reference Figure 1 and Figure 3The top surface of the fixing plate 45 is provided with two grooves 454, and the two grooves 454 are arranged at intervals on both sides of the center point of the fixing plate 45. The bottom surface of the mixing barrel 2 is provided with two protrusions 21 matching the grooves 454, and the two protrusions 21 are arranged at intervals at the midpoint of the mixing barrel 2. The side wall of the fixing plate 45 is provided with two threaded holes 455, and the two threaded holes 455 respectively penetrate the two grooves 454. There are two locking components 453, and each locking component 453 includes a threaded rod 4531 and a rotating handle arranged at the end of the threaded rod 4531. Hand 4532, the side walls of the two protrusions 21 of the mixing barrel 2 are provided with openings matching the size of the threaded rod 4531, and the two protrusions 21 of the mixing barrel 2 are respectively inserted into the two grooves 454, and the threaded rod 4531 is threadedly connected to the threaded hole 455 and passes through the opening to fix the mixing barrel 2 to the top surface of the fixing plate 45, and the threaded rod 4531 is rotated to rotate the threaded rod 4531 out of the protrusion 21 to realize the removal of the mixing barrel 2 from the fixing plate 45. The structure is easy to use, and turning the handle 4532 facilitates the rotation of the threaded rod 4531.
[0029] Reference Figure 1 Furthermore, a polishing device for producing metal buttons also includes a material frame 5 and a shaking screen plate 6. The end wall of the base 1 is recessed with a placement groove 14. The material frame 5 is placed in the placement groove 14 and the opening is upward. The top surface of the base 1 is provided with a receiving groove 15 at the position of the placement groove 14. The shaking screen plate 6 is placed in the receiving groove 15 for support. Springs 7 are provided between the two end walls of the shaking screen plate 6 and the side walls of the receiving groove 15, and the number of springs 7 is multiple. One end of the spring 7 is connected and fixed to the shaking screen plate 6, and the other end of the spring 7 is connected and fixed to the side wall of the receiving groove 15. The shaking screen plate 6 is supported by the spring 7 to move forward and backward and swing left and right to make the shaking screen plate 6 move. The shaking of the movable screen plate 6 is relatively stable. A discharge trough 61 is recessed on the top surface of the shaking screen plate 6. A plurality of drop holes 62 arranged in an array are provided on the bottom surface of the discharge trough 61. The size of the drop holes 62 is set to be larger than the size of the polishing particles and smaller than the size of the metal buttons. An opening is set in the area of the base 1 where the drop holes 62 are positioned in the accommodating groove 15 to connect the drop holes 62 to the placement groove 14. By pouring the metal buttons and polishing particles into the discharge trough 61 and pulling the shaking screen plate 6 to shake, the polishing particles and the metal buttons roll in the discharge trough 61 of the shaking screen plate 6, and the polishing particles fall from the drop holes 62 onto the material frame 5, so that the polishing particles and the metal buttons are separated.
[0030] Reference Figure 1 Furthermore, the top surface of the shaking screen plate 6 is provided with pulling handles 63 on both sides of the discharge trough 61 , and it is convenient to shake the shaking screen plate 6 by pulling the pulling handles 63 .
[0031] The implementation principle of the polishing equipment for metal button production of the present application is as follows: polishing particles and metal buttons are placed in a mixing barrel 2 for mixing, a first servo motor 32 drives a main shaft 31 to rotate through a first transmission structure 33 to drive a turntable 13 to rotate, the rotation of the turntable 13 drives an eccentric vibration component 4 and the mixing barrel 2 to rotate on the same axis, so that the polishing particles and the metal buttons rotate inside the mixing barrel 2, while the turntable 13 rotates, a second servo motor 43 drives a rotating shaft 42 to rotate through a second transmission structure 44, the rotation of the rotating shaft 42 drives a cam 421 to rotate eccentrically, and the cam 421 rotates eccentrically. The roller 452 is driven to vibrate up and down, and the up and down vibration of the roller 452 acts on the fixed plate 45 through the roller seat 451 to make the fixed plate 45 vibrate up and down. The up and down vibration of the fixed plate 45 acts on the mixing barrel 2 to make the mixing barrel 2 vibrate up and down, and the polishing particles and metal buttons in the mixing barrel 2 are tossed up and down. On the basis of the eccentric vibration of the mixing barrel 2, the mixing barrel 2 is driven to rotate by the turntable 13, so that the polishing particles and the metal buttons are tossed up and down and rotate at the same time, so that the polishing particles polish the surface of the metal buttons. The flow rate of the two is faster and the collision is more intense, so that the polishing efficiency of the metal buttons is faster.
[0032] After the metal buttons are polished, twist the threaded rod 4531 to remove the mixing barrel 2 from the fixed plate 45, and pour the polishing particles and the polished metal buttons into the discharge trough 61 of the shaking screen plate 6. Pull the shaking screen plate 6 by pulling the handle 63 to make the shaking screen plate 6 shake, and the polishing particles fall from the drop hole 62 onto the material frame 5, so that the polishing particles and the metal buttons are separated, thereby realizing the recovery of polishing particles and the discharge of metal buttons.
[0033] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A polishing device for metal button production, characterized in that: It includes a base and a mixing barrel. The base is rotatably provided with a turntable and a rotation driving component for driving the turntable to rotate. An eccentric vibration component is provided on the top surface of the turntable. The eccentric vibration component is connected to the mixing barrel to fix the mixing barrel and drive the mixing barrel to vibrate up and down. The rotation driving component drives the turntable to rotate and drives the eccentric vibration component and the mixing barrel to rotate on the same axis.
2. The polishing equipment for metal button production according to claim 1, characterized in that: The rotation drive assembly includes a main shaft, a first servo motor and a first transmission structure. The main shaft is vertically arranged and rotatably connected to the base. The top end of the main shaft is connected and fixed to the bottom surface of the turntable. The first servo motor is fixed on the base and drives the main shaft to rotate through the first transmission structure.
3. The polishing equipment for metal button production according to claim 1, characterized in that: The eccentric vibration component includes a bearing seat, a rotating shaft, a second servo motor, a second transmission structure, a fixed plate, a sliding sleeve, a sliding rod, and a tension spring. The number of the bearing seats is two, one end of the rotating shaft is connected to one of the bearing seats, and the other end of the rotating shaft is connected to the other bearing seat. The rotating shaft is supported to rotate by the bearing seat, and a cam is arranged on the rotating shaft. The second servo motor is fixed on the turntable and drives the rotating shaft to rotate through the second transmission structure. The number of the sliding sleeves is at least two, and a plurality of the sliding sleeves are vertically fixed on the top of the turntable. The sliding rod The number of the sliding sleeves matches the number of the sliding sleeves, and a sliding rod slides in the inner hole of each sliding sleeve, and the top ends of the plurality of sliding rods are connected and fixed to the fixed plate, and the fixed plate is slidably supported by the sliding sleeves and the sliding rods. The bottom surface of the fixed plate is provided with a roller seat, and a roller is rotatably provided on the roller seat, and the outer periphery of the roller abuts against the outer periphery of the cam, one end of the tension spring is connected and fixed to the turntable, and the other end of the tension spring is connected and fixed to the fixed plate, and a locking assembly is provided on the fixed plate, and the mixing barrel is fixed to the top surface of the fixed plate by the locking.
4. The polishing equipment for metal button production according to claim 3, characterized in that: The top surface of the fixing plate is concavely provided with a groove, the bottom surface of the mixing barrel is convexly provided with a protrusion matching the groove, the side wall of the fixing plate is provided with a threaded hole penetrating the groove, the locking assembly includes a threaded rod and a rotating handle arranged at the end of the threaded rod, the side wall of the protrusion of the mixing barrel is provided with an opening matching the size of the threaded rod, the protrusion of the mixing barrel is inserted into the groove, the threaded rod is threadedly connected to the threaded hole and passes through the opening to fix the mixing barrel to the top surface of the fixing plate.
5. The polishing equipment for metal button production according to claim 1, characterized in that: The cam is provided with an opening in the top surface of the base where the material frame is placed and the opening is upward; the cam is provided with an opening at a position corresponding to the cam; the cam is placed in the opening and supported by the cam; springs are provided between the two end walls of the cam and the side walls of the opening; one end of the spring is connected and fixed to the cam, and the other end of the spring is connected and fixed to the side wall of the opening; a material discharge groove is provided on the top surface of the cam, and a plurality of material drop holes arranged in an array are provided on the bottom surface of the cam; an opening is provided on the base where the material drop holes are corresponding to the cam to connect the material drop holes to the cam.