Ultrasonic automatic roll welding machine for sheet materials

Abstract

We provide an ultrasonic automatic roll welding machine for sheet-like materials. [Solution] A support seat 2 and a lateral movement module 3 are attached to the upper end of a workbench 1, a joining plate is attached to the lateral movement module 3, and the back of the joining plate is slidably attached to a guide rail fixed to the workbench 1, a roll welding assembly 7 is attached to the lower end of a cylinder fixed to the joining plate, and a positioning member 8 that restricts the position of the material to be welded is fixed to the workbench 1 below the roll welding assembly 7. When roll welding a sheet-like material, the ultrasonic automatic roll welding machine can remove heat from the welding head by opening an air passage in the welding head and utilizing the airflow in the air passage, and at the same time accelerate the airflow velocity around the welding head by intake and exhaust, thereby avoiding the accumulation of heat due to slow airflow velocity.

Description

Technical Field

[0001] The present invention relates to the technical field of roll welding machines, and more specifically to an ultrasonic automatic roll welding machine for sheet-shaped materials.

Background Art

[0002] The consistency and stability of the ultrasonic welding effect of metal materials, plastics or composite materials have always been important indicators of product quality. Taking composite materials as an example, composite materials use PET materials as the intermediate layer, and metal materials are attached to the front and back by vapor deposition or spraying methods. Compared with ordinary metal materials, composite materials are characterized by being lightweight and highly safe. Therefore, the energy density of lithium batteries can be significantly increased. However, due to the presence of PET materials in the middle, the metals on the front and back of the composite material cannot conduct electricity smoothly, preventing the composite material from becoming an electrode. To make the front and back of the composite material conductive, one layer of corresponding metal material is attached to the front and back of the composite material respectively, and welded by the roll welding method to make the front and back conductive.

[0003] For example, the new ultrasonic roll welding mechanism with the registration number CN215620054U includes a rack, a toothed cutter roll is installed on the rack, a roll welding mechanism is provided above the toothed cutter roll, the roll welding mechanism is provided above the toothed cutter roll and includes a welding head that coincides with it. The welding head includes a welding part and a roll shaft part used for installation. A shaft sleeve is mounted on the outer surface of the roll shaft part, bearings are attached to both ends of the shaft sleeve, the shaft sleeve is rotatably attached to the fixed base of the rack through the bearings, and a servo motor and a synchronous belt assembly for rotating the shaft sleeve are provided on the rack. The linear velocity of the rotation of the welding head is the same as the linear velocity of the toothed cutter roll.

[0004] The above-mentioned conventional technology has the following technical challenges. Existing roll welding mechanisms complete welding by converting electrical energy through a transducer into high-frequency mechanical vibration energy when welding a workpiece. As a result, the welding head tends to become hot during the welding process, and if the welding head remains at a high temperature for a long period of time, it can affect the lifespan of the welding head. In addition, if the airflow velocity around the welding head is poor, heat can accumulate around the welding head. Therefore, in order to solve the above problems, we propose an ultrasonic automatic roll welding machine for sheet-like materials. [Overview of the project]

[0005] The object of the present invention is to provide an ultrasonic automatic roll welding machine for sheet-like materials, thereby solving the problems that existing roll welding mechanisms currently on the market, as proposed in the background art above, have in that when welding a workpiece, they convert electrical energy through a transducer into high-frequency mechanical vibration energy to complete the welding, and as a result the welding head tends to become hot during the welding process, and if the welding head remains at a high temperature for a long period of time, it tends to affect the lifespan of the welding head, and also when the airflow velocity around the welding head is poor, heat accumulates around the welding head.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: an ultrasonic automatic roll welding machine for sheet-like materials, comprising a workbench, a support seat fixedly attached to the upper end of the workbench, a lateral movement module attached to the support seat, a joining plate attached to the lateral movement module, the back of the joining plate slidably attached to a guide rail fixed to the workbench, a cylinder fixedly connected to the joining plate, a roll welding assembly attached to the lower end of the cylinder, a positioning member provided below the roll welding assembly, the positioning member fixed to the workbench and used to restrict the position of the material to be welded, a turbulent cooling structure attached to the roll welding assembly, the turbulent cooling structure is used to supply air to the roll welding assembly for cooling and to increase the airflow velocity around the roll welding assembly.

[0007] Preferably, the roll welding assembly comprises a conductive slip ring, a transducer, a welding head, and a protective cover, wherein the transducer is mounted on one side of the conductive slip ring, and the welding head is mounted on the end of the transducer away from the conductive slip ring, the welding head is mounted on a bearing via a bearing, and a dust cover is mounted on the bearing.

[0008] By using the above technical solution, ultrasonic vibrations of a predetermined frequency and amplitude are generated in the welding head by providing a conductive slip ring and a transducer.

[0009] Preferably, the turbulent cooling structure comprises an air supply pipe, an air passage, an exhaust port, a diversion pipe, a joining block, a housing slot, a wind turbine, a reciprocating screw, a piston block, an empty slot, a vertical bar, a through hole, an auxiliary spring, and a vibrating ball, wherein one end of the air supply pipe is attached to the center of the welding head and the other end of the air supply pipe is connected to an external air source device, an air passage is opened in the center of the welding head and an exhaust port is opened in the circumferential direction of the air passage, a diversion pipe is attached to the air supply pipe and the end of the diversion pipe away from the air supply pipe is connected to the joining block, and a housing slot is located inside the joining block A slot is opened, and a wind turbine is installed inside the housing slot. An exhaust passage is opened on the side of the connecting block away from the flow divider. A reciprocating screw is connected to the center of the wind turbine with a key, and a piston block is attached to the lower end of the reciprocating screw. The piston block is located inside the empty slot, and the empty slot is opened in the center of the vertical bar. The vertical bar is fixed to the lower end of the connecting block, and a through hole is made in the bottom of the vertical bar. An auxiliary spring is fixed and connected inside the piston block, and a vibrating ball is attached to the end of the auxiliary spring that is not connected inside the piston block.

[0010] By using the above technical solution, the vibrating ball can be reset after moving inside the vertical rod by providing an auxiliary spring.

[0011] Preferably, the air passages communicate with each other to the outside via exhaust holes, and the exhaust holes are uniformly distributed at equal angles along the circumferential direction of the air passages.

[0012] Using the above technical solution, the airflow, once inside the air passage, can escape through the exhaust port, removing heat from the welding head.

[0013] Preferably, the welding head is rotatable on an air supply pipe, and the external air source device connected to the air supply pipe is an air pump.

[0014] By using the above technical solution, the welding head rotates in the air supply pipe, so as not to affect the normal roll welding process, and at the same time, by providing an air pump, air can be supplied to the inside of the welding head via the air supply pipe.

[0015] Preferably, the reciprocating screw and the piston block are screwed together, and a seal ring is fixedly connected to the edge of the piston block.

[0016] By using the above technical solution, the sealing of the piston block in the empty slots inside the vertical bar can be ensured by a seal ring fixed around the piston block.

[0017] Preferably, the piston block is slidable within an empty slot inside the vertical bar, and the outer wall of the piston block and the inner wall of the empty slot are in contact with each other, and the cross-section of the empty slot is set to be rectangular.

[0018] By using the above technical solution, the rectangular structure of the piston block makes it possible to avoid the piston block rotating in sync with the vertical rod.

[0019] Preferably, the empty slots inside the vertical bar communicate with the outside through through holes, and a steel wire brush is provided on the edge of the vertical bar, with the steel wire brush on the edge of the vertical bar in contact with the welding head.

[0020] Using the above technical solution, when the welding head rotates, the steel wire brush on the edge of the vertical bar can clean the powder adhering to the surface of the welding head.

[0021] Preferably, the auxiliary springs and vibrating balls are uniformly distributed in the empty slots inside the vertical rods, and the vibrating balls and the empty slots inside the vertical rods are in contact with each other.

[0022] Using the above technical solution, the auxiliary spring inside the empty slot can be vibrated by sucking in and blowing out air, and further, a vibrating ball is used to deliver an impact to the vertical bar.

[0023] Compared to conventional technology, the present invention has the following beneficial effects. When rolling welding a sheet-like material, the ultrasonic automatic roll welding machine can remove heat generated by the operation of the welding head by opening an air passage in the welding head and utilizing the airflow within the air passage. At the same time, it can accelerate the airflow velocity around the welding head using intake and exhaust methods, thereby avoiding the accumulation of heat due to slow airflow velocity.

[0024] 1. By providing a lateral movement module and a cylinder, the roll welding assembly can be pushed downward to a position where it contacts the workpiece fixed to the positioning member, thereby adjusting the distance between the roll welding assembly and the workpiece. Simultaneously, during welding, the lateral movement module controls the movement of the joining plate on the guide rail, and the movement of the lateral movement module further synchronizes the movement of the roll welding assembly, which uniformly welds the sheet material.

[0025] 2. An exhaust port is provided, and air is supplied to the air passage inside the welding head via an air pump and air supply pipe. The airflow flows through the air passage inside the welding head, exchanging heat with the welding head. After heat exchange, the airflow is discharged to the outside through the exhaust port, achieving heat exchange and cooling of the airflow inside the welding head. A portion of the airflow in the air supply pipe enters the joining block through a diversion pipe. After the airflow enters the joining block, it can rotate the windmill. The rotation of the windmill and reciprocating screw allows the piston block to reciprocate inside the vertical rod. The reciprocating movement of the piston block allows the airflow around the welding head to be drawn in and discharged using the through holes and empty slots, accelerating the airflow velocity around the welding head and avoiding heat accumulation due to slow airflow velocity.

[0026] 3. A vibration ball is provided, a steel wire brush is fixed in the circumferential direction of the vertical rod, and when the welding head rotates for roll welding, the dust adhering to the edge of the welding head can be scraped off by the steel wire brush. At the same time, when the air flow inside the empty slot is pushed outwards, the air flow can deform and reset the auxiliary spring inside the vertical rod. The vertical rod is attached to the roll welding assembly, and due to the vibration generated by the roll welding assembly during welding, similarly, the auxiliary spring inside the vertical rod can be deformed and reset. Due to the deformation and reset of the auxiliary spring, an impact can be applied to the vertical rod by using the vibration ball at the end. Due to the vibration caused by applying an impact to the vertical rod, the dust adhering to the steel wire brush can be shaken off.

Brief Description of the Drawings

[0027] [Figure 1] It is a schematic three-dimensional view of the front of the present invention. [Figure 2] It is a schematic structural view of the roll welding assembly and the positioning member of the present invention. [Figure 3] It is a schematic structural view of the joint plate and the cylinder of the present invention. [Figure 4] It is a schematic structural view of the transducer and the welding head of the present invention. [Figure 5] It is a schematic structural view of the welding head and the vertical rod of the present invention. [Figure 6] It is a schematic structural view of the vertical rod and the through hole of the present invention. [Figure 7] It is a cross-sectional structural view of the joint block and the windmill of the present invention. [Figure 8] It is a schematic structural view of the auxiliary spring and the vibration ball of the present invention. [Figure 9] It is a schematic structural view of the air supply pipe and the shunt pipe of the present invention. [Figure 10] It is a schematic structural view of the air flow path and the exhaust hole of the present invention.

Embodiments for Carrying out the Invention

[0028] The technical solutions in embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments. Clearly, the embodiments described are only a part of the embodiments of the present invention, not all embodiments. Any other embodiments that a person skilled in the art could obtain without creative work based on the embodiments of the present invention are all within the scope of the protection of the present invention.

[0029] Example 1: Referring to Figures 1 to 10, existing roll welding mechanisms convert electrical energy via transducer 702 into high-frequency mechanical vibration energy to complete welding when welding a workpiece. As a result, the welding head 703 tends to become hot during the welding process, and if the welding head 703 remains at a high temperature for a long period of time, it can affect the service life of the welding head 703. Also, when the airflow velocity around the welding head 703 is poor, heat accumulates around the welding head 703. To solve these technical problems, this example discloses the following technical details. An ultrasonic automatic roll welding machine for sheet-like materials is provided, comprising a workbench 1, a support seat 2 fixedly attached to the upper end of the workbench 1, a lateral movement module 3 attached to the support seat 2, a joining plate 4 attached to the lateral movement module 3, the back of the joining plate 4 being slidably attached to a guide rail 5 fixed to the workbench 1, a cylinder 6 fixedly connected to the joining plate 4, a roll welding assembly 7 attached to the lower end of the cylinder 6, a positioning member 8 provided below the roll welding assembly 7, the positioning member 8 fixed to the workbench 1 and used to regulate the position of the material to be welded, a turbulent cooling structure 9 attached to the roll welding assembly 7, the turbulent cooling structure 9 is used to supply air to the roll welding assembly 7 for cooling and to increase the airflow velocity around the roll welding assembly 7, and the roll welding assembly 7 is conductive The turbulent cooling structure 9 comprises a conductive slip ring 701, a transducer 702, a welding head 703, and a protective cover 704, wherein the transducer 702 is attached to one side of the conductive slip ring 701, and the welding head 703 is attached to the end of the transducer 702 away from the conductive slip ring 701, the welding head 703 is mounted to a bearing base via a bearing, and a dust cover 704 is attached to the bearing base, and the turbulent cooling structure 9 comprises an air supply pipe 901, an air passage 902, an exhaust port 903, a diversion pipe 904, a joining block 905, a housing slot 906, a wind turbine 907, a reciprocating screw 908, a piston block 909, an empty slot 910, a vertical bar 911, a through hole 912, an auxiliary spring 913, and a vibrating ball 914, wherein one end of the air supply pipe 901 is attached to the center of the welding head 703, and the other end of the air supply pipe 901 is connected to an external air source device.An air passage 902 is opened in the center of the welding head 703, and exhaust holes 903 are opened in the circumferential direction of the air passage 902, a diversion pipe 904 is attached to the air supply pipe 901, and the end of the diversion pipe 904 away from the air supply pipe 901 is connected to the joining block 905, a housing slot 906 is opened inside the joining block 905, and a wind turbine 907 is installed inside the housing slot 906, and the side of the joining block 905 away from the diversion pipe 904 An exhaust passage is opened, a reciprocating screw 908 is connected to the center of the wind turbine 907 with a key, and a piston block 909 is attached to the lower end of the reciprocating screw 908, the piston block 909 is located inside an empty slot 910, the empty slot 910 is opened in the center of a vertical bar 911, the vertical bar 911 is fixed to the lower end of the connecting block 905, and a through hole 912 is made in the bottom of the vertical bar 911, and an auxiliary spring is located inside the piston block 909 A spring 913 is fixedly connected, and a vibrating ball 914 is attached to the end of the auxiliary spring 913 that is not connected to the inside of the piston block 909. The air passages 902 communicate with each other to the outside via exhaust holes 903, and the exhaust holes 903 are uniformly distributed at equal angles along the circumferential direction of the air passages 902. The welding head 703 is rotatable on the air supply pipe 901, and the external air source device connected to the air supply pipe 901 is an air pump. The reciprocating screw 908 and the piston block 909 are screwed together, and a seal ring is fixedly connected to the edge of the piston block 909. The piston block 909 is slidable within the empty slot 910 inside the vertical bar 911, and the outer wall of the piston block 909 and the inner wall of the empty slot 910 are in contact with each other. The cross-section of the empty slot 910 is set to be rectangular, and the empty slot 910 inside the vertical bar 911 communicates with the outside via a through hole 912.

[0030] When roll welding of a sheet-like material is required, the sheet-like material is placed and fixed on the positioning member 8 of the workbench 1, and then the cylinder 6 is turned on. After the cylinder 6 is turned on, the roll welding assembly 7 is moved downward to bring it into contact with the sheet-like material fixed to the positioning member 8. At this time, electrical energy is converted into ultrasonic mechanical energy via the conductive slip ring 701 and transducer 702 on the roll welding assembly 7, and ultrasonic vibrations are used to convert the energy into a weld mark via the welding head 703, thereby welding the material together. In the roll welding process, the lateral movement module 3 controls the movement of the joining plate 4 on the guide rail 5, and the movement of the joining plate 4 can synchronize with the movement of the roll welding assembly 7, allowing the material to be roll-welded uniformly by moving the roll welding assembly 7. During the welding process, air is supplied to the air passage 902 inside the welding head 703 via an air pump and air supply pipe 901. The airflow flows through the air passage 902, exchanges heat with the welding head 703, and removes heat from the welding head 703. After heat exchange, the airflow flows out through the circumferential exhaust holes 903 of the welding head 703, achieving air cooling of the welding head 703. At the same time, after entering the air supply pipe 901, the airflow can pass through the diversion pipe 904 and enter the joining block 905. After entering the joining block 905, the airflow can rotate the wind turbine 907 in the housing slot 906. The rotation of the wind turbine 907 can synchronously rotate the reciprocating screw 908. By utilizing rotation, the screwed piston block 909 can reciprocate up and down within the empty slot 910 inside the vertical bar 911. When the piston block 909 moves upward, it can draw airflow around the welding head 703 into the empty slot 910 through the through hole 912. When the piston block 909 moves downward, it can push airflow inside the empty slot 910 out through the through hole 912. This allows the airflow velocity around the welding head 703 to be accelerated by drawing in and expelling airflow around the welding head 703, thus avoiding the accumulation of heat around the welding head 703 due to slow airflow velocity.While direct air cooling can lower the temperature of the welding head, its effectiveness may be limited by the contact area and duration between the cold air and the surface of the welding head. Furthermore, direct air cooling may not adequately cool the heat storage area inside the welding head. Temperature control with direct air cooling can be relatively coarse, as the flow rate and direction of the cold air may not be precisely controlled, resulting in different cooling rates for different parts of the welding head. On the other hand, air cooling with holes drilled inside allows for precise control of the flow rate, velocity, and direction of the cold air, enabling more accurate temperature control of the welding head. This contributes to mitigating potential problems such as thermal stress, deformation, and cracking during the welding process. Additionally, because the cold air can be blown directly into the welding head, the heat generated during the welding process can be removed more quickly.

[0031] Example 2: The technical details disclosed in this example are further improvements based on Example 1 described above. This example discloses the following technical details: a steel wire brush is provided on the edge of the vertical bar 911, and the steel wire brush on the edge of the vertical bar 911 is in contact with the welding head 703. The auxiliary spring 913 and the vibrating ball 914 are uniformly distributed in the empty slots 910 inside the vertical bar 911, and the vibrating ball 914 and the empty slots 910 inside the vertical bar 911 are in contact with each other.

[0032] A steel wire brush is provided on the edge of the vertical bar 911, and when the welding head 703 rotates to perform roll welding, dust on the surface of the welding head 703 can be scraped off by the steel wire brush on the edge of the vertical bar 911, thereby achieving automatic cleaning of the welding head 703. At the same time, when the vertical bar 911 exhausts to the outside through the through hole 912, the exhaust causes the auxiliary spring 913 to vibrate, and the vibrating ball 914 at the end of the auxiliary spring 913 is used to strike the vertical bar 911, and the vibration caused by the impact on the vertical bar 911 shakes off the dust adhering to the steel wire brush. Furthermore, the vertical bar 911 is also attached to the roll welding assembly 7, and when the roll welding assembly 7 performs welding, it generates ultrasonic vibrations of a predetermined frequency and amplitude, so when the roll welding assembly 7 vibrates, it can similarly generate vibrations in the auxiliary spring 913 inside the vertical bar 911, and further impact the vertical bar 911 is used to strike the vertical bar 911 using the vibrating ball 914 at the end of the auxiliary spring 913.

[0033] Anything not described in detail herein is prior art known to those skilled in the art.

[0034] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will still be able to modify the technical solutions described in each of the above embodiments or replace the technical features with equivalent ones. Any modifications, equivalent replacements, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention. [Explanation of Symbols]

[0035] 1. Workbench 2, support seat 3. Lateral movement module 4, joint plate 5. Guide rails 6. Cylinder 7. Roll welding assembly 701, conductive slip ring 702, Transducer 703, welding head 704, protective cover 8. Positioning member 9. Turbulent cooling structure 901, air supply pipe 902, Airflow channel 903, Exhaust port 904, Shunt pipe 905, Joining block 906, storage slots 907, windmill 908, Round trip Screw 909, piston block 910, empty slot 911, vertical bar 912, through hole 913, auxiliary spring 914, Vibrating Ball.

Claims

1. An ultrasonic automatic roll welding machine for sheet-like materials, comprising a work table (1), a support seat (2) fixedly attached to the upper end of the work table (1), a lateral movement module (3) attached to the support seat (2), a joining plate (4) attached to the lateral movement module (3), and the back surface of the joining plate (4) slidably attached to a guide rail (5) fixed to the work table (1), wherein a cylinder (6) is fixedly connected to the joining plate (4), and the lower end of the cylinder (6) An ultrasonic automatic roll welding machine for sheet materials, characterized in that a roll welding assembly (7) is attached to a workbench (1), a positioning member (8) is provided below the roll welding assembly (7), the positioning member (8) is fixed to a workbench (1) and used to restrict the position of the material to be welded, and a turbulent cooling structure (9) is attached to the roll welding assembly (7), the turbulent cooling structure (9) is used to supply air to the roll welding assembly (7) to cool it and to increase the airflow velocity around the roll welding assembly (7).

2. The ultrasonic automatic roll welding machine for sheet-like materials according to claim 1, wherein the roll welding assembly (7) comprises a conductive slip ring (701), a transducer (702), a welding head (703), and a protective cover (704), the transducer (702) being attached to one side of the conductive slip ring (701), and the welding head (703) being attached to the end of the transducer (702) away from the conductive slip ring (701), the welding head (703) being attached to a bearing base via a bearing, and a dust cover (704) being attached to the bearing base.

3. The turbulent cooling structure (9) comprises an air supply pipe (901), an air passage (902), an exhaust port (903), a flow divider pipe (904), a joining block (905), a housing slot (906), a wind turbine (907), a reciprocating screw (908), a piston block (909), an empty slot (910), a vertical bar (911), a through hole (912), an auxiliary spring (913), and a vibrating ball (914), with one end of the air supply pipe (901) attached to the center of the welding head (703). The other end of the air supply pipe (901) is connected to an external air source device, an air passage (902) is opened in the center of the welding head (703), and an exhaust hole (903) is opened in the circumferential direction of the air passage (902), a diversion pipe (904) is attached to the air supply pipe (901), and the end of the diversion pipe (904) away from the air supply pipe (901) is connected to a joining block (905), and a housing slot (906) is located inside the joining block (905). An opening is made, and a wind turbine (907) is installed inside the housing slot (906), an exhaust passage is opened on the side of the connecting block (905) away from the diversion pipe (904), a reciprocating screw (908) is connected to the center of the wind turbine (907) with a key, and a piston block (909) is attached to the lower end of the reciprocating screw (908), the piston block (909) is located inside the empty slot (910), and the empty slot (910) is a vertical bar ( The ultrasonic automatic roll welding machine for sheet-like materials according to claim 2, characterized in that an opening is made in the center of 911), the vertical bar (911) is fixed to the lower end of the joining block (905), a through hole (912) is made in the bottom of the vertical bar (911), an auxiliary spring (913) is fixed and connected inside the piston block (909), and a vibrating ball (914) is attached to the end of the auxiliary spring (913) that is not connected inside the piston block (909).

4. The ultrasonic automatic roll welding machine for sheet-like materials according to claim 3, characterized in that the air passages (902) communicate with each other to the outside via exhaust holes (903), and the exhaust holes (903) are uniformly distributed in a plurality at equal angles along the circumferential direction of the air passages (902).

5. The ultrasonic automatic roll welding machine for sheet-like materials according to claim 3, characterized in that the welding head (703) is rotatable on an air supply pipe (901), and the external air source device connected to the air supply pipe (901) is an air pump.

6. The ultrasonic automatic roll welding machine for sheet-like materials according to claim 3, characterized in that the reciprocating screw (908) and the piston block (909) are screwed together, and a seal ring is fixedly connected to the edge of the piston block (909).

7. The ultrasonic automatic roll welding machine for sheet-like materials according to claim 3, characterized in that the piston block (909) is slidable within an empty slot (910) inside the vertical bar (911), the outer wall of the piston block (909) and the inner wall of the empty slot (910) are in contact with each other, and the cross-section of the empty slot (910) is set to be rectangular.

8. The ultrasonic automatic roll welding machine for sheet-like materials according to claim 3, characterized in that the empty slot (910) inside the vertical bar (911) communicates with the outside through a through hole (912), and a steel wire brush is provided on the edge of the vertical bar (911), and the steel wire brush on the edge of the vertical bar (911) is in contact with the welding head (703).

9. The ultrasonic automatic roll welding machine for sheet-like materials according to claim 3, characterized in that the auxiliary spring (913) and vibrating ball (914) are uniformly distributed in the empty slot (910) inside the vertical bar (911), and the vibrating ball (914) and the empty slot (910) inside the vertical bar (911) are in contact with each other.

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