A full-automatic rubber band discharging structure and a working method thereof

Abstract

The application discloses a full-automatic rubber band discharging structure and a working method thereof, relates to the technical field of discharging, and comprises a rotary screening device, a linear vibration device and a vibrating disc device. The linear vibration device comprises a linear vibrator arranged on a machine table and a vibrating seat mounted on the linear vibrator. Linear guide grooves are formed in the vibrating seat. The rotary screening device is arranged above the linear guide grooves and is in brushing cooperation with the upper end surface of the rubber band. The sliding friction between the rotary screening device and the rubber band is greater than the sliding friction between the linear guide grooves and the rubber band. The material channel comprises a first feeding part, a screening part and a second feeding part which are sequentially and mutually connected. The application preliminarily screens materials through the screening part, and the rotary screening device performs secondary screening, so that the finally conveyed rubber band better meets the production standard, the screening quality is improved, the overall production stability of the application is better, and the application has the advantages of reasonable structure design, convenient use, high production efficiency and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of discharging, in particular to a full-automatic rubber band discharging structure and a working method thereof. BACKGROUND

[0002] As described in the comparative file 1 with the application number CN201920469817.1, the rubber band vibrator sends the rubber bands to the discharging port one by one. Since the rubber bands are narrow in thickness and are prone to adhesion, how to send the rubber bands to the discharging port one by one is a big difficulty in the field. The existing vibration disc is prone to continuously send multiple rubber bands, which affects the normal operation of the equipment.

[0003] As described in the comparative file 2 with the application number CN201920341302.3, the rubber band vibration mechanism sends the rubber bands one by one for material bundling. The existing rubber band vibration mechanism does not have a rejection function. A bag of rubber bands may contain broken rubber bands, which may cause material scattering and more rubber band defective products, and thus more material scattering and bundling failure, which may affect normal production. The rubber band vibration mechanism also has a difficulty, that is, how to send the rubber bands to the discharging port one by one. Since the rubber bands are narrow in thickness and are prone to adhesion, the existing vibration disc is prone to continuously send multiple rubber bands, which affects the normal operation of the equipment.

[0004] In the comparative file 2, it is stated that when the rubber band passes through the separation section 7, the separation section 7 separates two or more rubber bands. Since the separation section is limited to one rubber band, when multiple rubber bands pass through, the excess rubber bands will automatically fall to the bottom of the vibration disc 8. After the rubber band passes through the separation section 7, it enters the normal conveying. Although the separation section can separate multiple rubber bands to a certain extent, in actual use, the rubber bands may be tightly adhered to each other. The vibration disc is not enough to separate the adhered rubber bands, which may cause the separation section in the comparative file 2 to be blocked, and manual intervention is required to adjust the rubber band feeding efficiency.

[0005] In summary, in the prior art, the rubber band feeding mechanism has the following technical problems:

[0006] 1. The rubber bands in the vibration disc cannot be well screened during feeding. When multiple rubber bands are tightly adhered to each other, the rubber band feeding efficiency is low due to the blocking.

[0007] 2. The vibration disc is used to screen the rubber bands. The tightly adhered rubber bands cannot be well separated, which affects the normal operation of the equipment. SUMMARY

[0008] The present application is to overcome the above-mentioned problems and provide a technical solution to solve the above-mentioned problems.

[0009] To achieve the above object, the present application provides the following technical solutions.

[0010] A full-automatic rubber band discharging structure and its working method, comprising a machine table, a rotary screening device, a linear vibration device and a vibrating disc device are arranged on the machine table, the linear vibration device comprises a linear vibrator arranged on the machine table and a vibrating seat mounted on the linear vibrator, a linear guide groove is arranged on the vibrating seat, the vibrating disc device comprises a base arranged on the machine table, an electromagnetic exciter, a leaf spring and a hopper are arranged on the base, a spiral upward channel is arranged in the hopper, the rotary screening device is arranged above the linear guide groove and is in brushing cooperation with the upper end surface of the rubber band, the rotating direction of the rotary screening device is opposite to the feeding direction of the rubber band on the linear guide groove, and the sliding friction between the rotary screening device and the rubber band is greater than the sliding friction between the linear guide groove and the rubber band.

[0011] The channel comprises a first feeding part, a screening part and a second feeding part which are sequentially and mutually connected, the first feeding part extends to the bottom of the vibrating disc, the second feeding part extends to the discharging opening and is connected with the linear guide groove, an arc-shaped protrusion is arranged on the inner bottom surface of the screening part, the arc-shaped protrusion is tangent to the outer circle of the rubber band and the intersection point of the tangent is located at the quarter of the thickness direction of the rubber band.

[0012] As a further scheme of the present application, L-shaped blocks are arranged on both sides of the linear guide groove, the L-shaped blocks comprise a straight blocking part which is tangent to the outer circle of the rubber band and a horizontal blocking part which is tangent to the upper end surface of the rubber band, the straight blocking part and the horizontal blocking part cooperate with the vibrating seat to form the linear guide groove, the height of the linear guide groove is greater than twice the thickness of the rubber band, and the distance from the rotary screening device to the inner bottom surface of the linear guide groove is greater than the thickness of the rubber band and less than twice the thickness of the rubber band.

[0013] As a further scheme of the present application, the rotary screening device comprises a motor support fixedly arranged on the base, a motor mounted on the motor support and a brush piece driven by the motor, the brush piece is arranged above the linear guide groove, the brush piece is in brushing cooperation with the upper end surface of the rubber band and the rotating direction of the brush piece is opposite to the feeding direction of the rubber band on the linear guide groove, the distance from the brush piece to the inner bottom surface of the linear guide groove is greater than the thickness of the rubber band and less than twice the thickness of the rubber band, and the sliding friction between the brush piece and the rubber band is greater than the sliding friction between the linear guide groove and the rubber band.

[0014] As a further scheme of the present application, an included angle is arranged between the brush piece and the axis of the linear guide groove, the included angle is less than 30 degrees and greater than 10 degrees.

[0015] As a further scheme of the present application, the screening part comprises a screening protrusion with a circular cross section, and the screening protrusion is rotationally fixed along the inner wall of the hopper.

[0016] As a further scheme of the present application: the first feeding part comprises a first feeding protrusion which is perpendicular to the inner wall of the hopper, one end of the first feeding protrusion is connected to the inner bottom surface of the hopper by rotating downward along the inner wall of the hopper, the other end of the first feeding protrusion is connected to the screening protrusion by rotating upward along the inner wall of the hopper, and the connection between the first feeding protrusion and the screening protrusion is uniformly transitioned.

[0017] As a further scheme of the present application: the second feeding part comprises a second feeding protrusion which is perpendicular to the inner wall of the hopper, one end of the second feeding protrusion is connected to the screening protrusion by rotating downward along the inner wall of the hopper, the other end of the second feeding protrusion is connected to the linear guide groove by rotating upward along the inner wall of the hopper, and the connection between the second feeding protrusion and the screening protrusion is uniformly transitioned.

[0018] As a further scheme of the present application: an arc-shaped transition part is arranged between the second feeding protrusion and the linear guide groove, the arc-shaped transition part comprises a first interface which is communicated with the second feeding protrusion, a second interface which is communicated with the linear guide groove, and an arc-shaped feeding part which is communicated between the first interface and the second interface, the curvature of the arc-shaped feeding part is greater than the curvature of the inner wall of the hopper, a stop part is arranged on the upper end of the side wall of the arc-shaped feeding part and extends upward along the periphery of the arc-shaped feeding part, the stop part extends to the second interface and is communicated with the linear guide groove, and an air outlet part is arranged above the arc-shaped feeding part and blows air along the conveying direction of the rubber band.

[0019] As a further scheme of the present application: a lower groove is arranged at one end of the linear guide groove which is connected to the second interface, the lower groove penetrates the crosspiece part and the straight stop part, and the lower groove is used for mounting the brush part.

[0020] A full-automatic rubber band discharging method, which is suitable for products with uniform quality in each part, the diameter of the product is greater than the thickness, and the thickness size of the product is less than and close to one-seventeenth of the diameter size of the product, and the method comprises the following steps,

[0021] S1, a screening part is arranged on the disc wall of the feeding disc of the vibration disc relative to the position of the predetermined feeding track surface, the screening part is tangent to the outer circle of the product and abuts against the outer circle, and the intersection point of the abutment is located at one-fourth of the thickness direction of the product, when the inner wall of the feeding disc is a predetermined value, only two adhered rubber bands are allowed to pass, and three or more than three mutually adhered rubber bands will all fall back into the feeding disc due to gravity;

[0022] S2, at least one linear linear guide groove is arranged after the screening part 340, the linear guide groove has a feeding groove arranged in the horizontal direction, the rubber band moves forward in the feeding groove, and a rotating screening device is arranged above the feeding groove and abuts against the rubber band;

[0023] S3, the first screening state includes: moving the upper rubber band of the two adhered rubber bands backward by the rotating screening device, and only allowing single-layer rubber bands to pass between the rotating screening device and the linear guide groove;

[0024] S4, the second screening state includes: increasing the amplitude and / or vibration speed of the horizontal direction of the vibration disc while only allowing double-layer rubber bands to pass between the rotating screening device and the linear guide groove.

[0025] Compared with the prior art, the beneficial effects of the present application are as follows:

[0026] The present application can preliminarily screen the rubber bands to be screened by setting the screening part between the first feeding part and the second feeding part, which facilitates the next screening, the rotating screening device can perform secondary screening on the rubber bands entering the linear guide groove, and the rotating screening device can separate the adhered rubber bands, so that the finally conveyed rubber bands better meet the production standards, the screening quality can be improved, and the screening part and the rotating screening device are not prone to blocking, so that the overall production stability of the present application is better, and the present application has the advantages of reasonable structure design, convenient use and high production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural perspective view of the present application;

[0028] Figure 2 is a structural top view of the present application;

[0029] Figure 3 is a sectional view of the screening part 340 in the process of conveying one rubber band in the present application;

[0030] Figure 4 is a sectional view of the screening part 340 in the process of conveying two adhered rubber bands in the present application;

[0031] Figure 5 is a sectional view of the screening part 340 in the process of conveying three adhered rubber bands in the present application;

[0032] Figure 6 is a force analysis diagram in the process of conveying three adhered rubber bands in the present application;

[0033] Figure 7 is another force analysis diagram in the process of conveying three adhered rubber bands in the present application;

[0034] Figure 8 is a structural view of the lower groove 221 in the linear guide groove 220 in the present application;

[0035] Figure 9 is a structural view of the cooperation relationship between the brush and the linear guide groove 220 in the present application;

[0036] Figure 10 Figure 2 is another structural diagram of the cooperation between the brush and the linear guide groove 220 in the present application;

[0037] The reference signs and names in the figure are as follows:

[0038] Rotary screening device-100, linear vibration device-200, vibration disc device-300, vibration seat-210, linear guide groove-220, hopper-310, material channel-320, first feeding part-330, screening part-340, second feeding part-350, arc-shaped protrusion-360, L-shaped stop block-230, straight stop part-240, horizontal stop part-250, motor support-110, motor-120, brush-130, screening protrusion-341, first feeding protrusion-331, second feeding protrusion-351, arc-shaped transition part-410, first interface-411, second interface-412, arc-shaped feeding part-414, stop part-415, lower groove-221. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0040] Please refer to Figures 1-10 A full-automatic rubber band discharging structure, comprising a machine table, a rotary screening device 100, a linear vibration device 200 and a vibration disc device 300 are arranged on the machine table, the linear vibration device 200 comprises a linear vibrator arranged on the machine table and a vibration seat 210 mounted on the linear vibrator, a linear guide groove 220 is arranged on the vibration seat 210, the vibration disc device 300 comprises a base arranged on the machine table, an electromagnetic exciter, a leaf spring and a hopper 310 are arranged on the base, a material channel 320 spirally upward is arranged in the hopper 310, the rotary screening device 100 is arranged above the linear guide groove 220 and is in brushing cooperation with the upper end surface of the rubber band, the rotating direction of the rotary screening device 100 is opposite to the feeding direction of the rubber band on the linear guide groove 220, and the sliding friction between the rotary screening device 100 and the rubber band is greater than the sliding friction between the linear guide groove 220 and the rubber band.

[0041] The material channel 320 includes a first feeding part 330, a screening part 340 and a second feeding part 350 which are sequentially communicated with each other, the first feeding part 330 extends to the bottom of the vibrating disc, the second feeding part 350 extends to the discharge port and communicates with the linear guide groove 220, and the inner bottom surface of the material channel 320 of the screening part 340 is provided with an arc-shaped protrusion 360, the arc-shaped protrusion 360 is tangent to the outer circle of the rubber band and the intersection point of the abutment is located at one fourth of the thickness direction of the rubber band.

[0042] The rubber band used in the application has a diameter of 35 mm and a thickness of 2 mm, the rubber band needs to be attached to the inner wall of the hopper 310 to make the stability of the rubber band good during the conveying process, the inclination angle of the inner wall of the hopper 310 is equal to 85°, the rubber band has a uniform mass annular structure and is relatively light, and the deformation amount during the conveying process is small, and the rubber band is similar to a rigid body with uniform mass distribution, and the center of gravity is located at the geometric center of the annular structure;

[0043] As shown in Figure 3 , during the conveying process of a single rubber band, the inclination angle of the inner wall of the hopper 310 is equal to 85°, the arc-shaped protrusion 360 is tangent to the outer circle of the rubber band and the intersection point of the abutment is located at one fourth of the thickness direction of the rubber band, the abutment point of the arc-shaped protrusion 360 and the outer circle of the rubber band is used as a fulcrum, the center of gravity a of the rubber band passes through the geometric center of the rubber band and is vertically downward, the straight line La where the center of gravity of the rubber band is located is located on the side close to the inner wall of the hopper 310 of the fulcrum, and the single rubber band will be attached to the inner wall of the hopper 310 and conveyed to the second feeding part 350 through the screening part 340;

[0044] As shown in Figure 4 , during the conveying process of two rubber bands adhered together, the inclination angle of the inner wall of the hopper 310 is equal to 85°, the arc-shaped protrusion 360 is tangent to the outer circle of the rubber band and the intersection point of the abutment is located at one fourth of the thickness direction of the single rubber band, the abutment point of the arc-shaped protrusion 360 and the outer circle of the rubber band is used as a fulcrum, the center of gravity b of the two rubber bands adhered together passes through the geometric center of the whole after the two rubber bands are adhered together and is vertically downward, the straight line Lb where the center of gravity of the two rubber bands adhered together is located is located on the side close to the inner wall of the hopper 310 of the fulcrum, and the two rubber bands adhered together will be attached to the inner wall of the hopper 310 and conveyed to the second feeding part 350 through the screening part 340;

[0045] As shown in Figure 5As shown, the three adhesions together in the process of conveying, the inner wall of the hopper 310 angle is equal to 85 °, the arc convex 360 and the outer circle of the rubber band is tangent to the intersection point is located in the thickness direction of a single rubber band quarter, with the arc convex 360 and the outer circle of the rubber band tangent to the fulcrum, three adhesions together in the process of conveying, the center of gravity c of three adhesions together in the geometric center of the whole after the adhesion of the rubber band and vertically downward, the straight line Lc of the center of gravity of three adhesions together is on the side away from the inner wall of the hopper 310, three adhesions together in the process of passing through the screening part 340 will fall, so as to complete the preliminary screening, and the screening part 340 will not be blocked;

[0046] The first screening is carried out by the arc convex 360 of the screening part 340, so that the rubber band is screened for the first time, so that the screening part 340 and the second feeding part 350 pass through at most two rubber bands, and when multiple (greater than or equal to three) rubber bands are adhesions, they will fall into the hopper 310 due to gravity, so as to realize the screening of two rubber bands, and the blocking condition will not occur. When two adhesions are sent to the linear guide groove 220, the second screening is carried out by the rotating screening device 100. When the two adhesions are adhered together, the lower rubber band is in contact with the inner bottom surface of the linear guide groove 220. Under the action of the linear vibrator, the lower rubber band moves forward. The rotating direction of the rotating screening device 100 is opposite to the feeding direction of the rubber band on the linear guide groove 220. The upper rubber band moves backward, so that the upper rubber band and the lower rubber band are subjected to opposite forces, thereby facilitating the separation of the two adhesions. The rotating screening device 100 is arranged above the linear guide groove 220 and is in brushing cooperation with the upper end surface of the rubber band. The sliding friction between the rotating screening device 100 and the rubber band is greater than the sliding friction between the linear guide groove 220 and the rubber band. Therefore, when the two adhesions are too tight to be separated by the rotating screening device 100, they will be brushed away from the linear guide groove 220, thereby avoiding blocking.

[0047] The present application can preliminarily screen the rubber band to be screened by arranging the screening part 340 between the first feeding part 330 and the second feeding part 350, which facilitates the next screening. The rotating screening device 100 can screen the rubber band entering the linear guide groove 220 for the second time, and the rotating screening device 100 can separate the adhesion of the rubber band, so that the finally conveyed rubber band better meets the production standard, the screening quality can be improved, and the screening part 340 and the rotating screening device 100 are not prone to blocking, so that the overall production stability of the present application is better, and the present application has the advantages of reasonable structure design, convenient use and high production efficiency.

[0048] In this embodiment of the invention, L-shaped blocks 230 are provided on both sides of the linear guide groove 220. The L-shaped blocks 230 include a straight block 240 that abuts against the outer ring of the rubber band and a horizontal block 250 that abuts against the upper end surface of the rubber band. The straight block 240, the horizontal block 250 and the vibrating seat 210 cooperate to form the linear guide groove 220. The height of the linear guide groove 220 is greater than twice the thickness of the rubber band. The distance from the rotating screening device 100 to the inner bottom surface of the linear guide groove 220 is greater than one times the thickness of the rubber band and less than twice the thickness of the rubber band.

[0049] like Figure 8 As shown in Figure 9, during the screening process, the rotary screening device 100 uses the straight baffle 240 to abut against the outer ring of the rubber band, thereby limiting the rubber band laterally. The horizontal baffle 250 vertically limits the two rubber bands that are stuck together, allowing the rubber bands to better cooperate with the rotary screening device 100 for screening. The lower rubber band abuts against the inner bottom surface of the linear guide trough 220. Under the action of the linear vibrator, the lower rubber band moves forward. The rotation direction of the rotary screening device 100 is opposite to the feeding direction of the rubber bands on the linear guide trough 220, and the distance between the rotary screening device 100 and the inner bottom surface of the linear guide trough 220 is greater than one... The thickness of the upper rubber band is less than twice the thickness of the lower rubber band. Therefore, the rotary screening device 100 brushes the upper rubber band backward and does not directly act on the lower rubber band. This causes the upper rubber band to move backward, so that the upper and lower rubber bands are subjected to forces in opposite directions. This facilitates the separation of two rubber bands that are stuck together. The sliding friction between the rotary screening device 100 and the rubber band is greater than the sliding friction between the linear guide trough 220 and the rubber band. When the two rubber bands are stuck too tightly and cannot be separated by the rotary screening device 100, they will be brushed away from the linear guide trough 220 to avoid clogging.

[0050] In this embodiment of the invention, the rotary screening device 100 includes a motor bracket 110 fixed on a base, a motor 120 mounted on the motor bracket 110, and a brush component 130 driven by the motor 120. The brush component 130 is located above the linear guide groove 220. The brush component 130 brushes against the upper end face of the rubber band, and the rotation direction of the brush component 130 is opposite to the feeding direction of the rubber band on the linear guide groove 220. The distance between the brush component 130 and the inner bottom surface of the linear guide groove 220 is greater than one times the thickness of the rubber band and less than two times the thickness of the rubber band. The sliding friction between the brush component 130 and the rubber band is greater than the sliding friction between the linear guide groove 220 and the rubber band.

[0051] The brush part 130 separates the two rubber bands that are stuck together.

[0052] In this embodiment of the invention, there is an included angle between the axis of the brush 130 and the axis of the linear guide groove 220, the included angle being less than 80 degrees and greater than 45 degrees.

[0053] like Figure 10 As shown, during the brushing process of the brush 130 and the rubber band, before being brushed away from the linear guide groove 220, the position of the rubber band relative to the brush 130 remains unchanged. The brush 130 rotates and brushes the rubber band, and the interaction between them can be compared to sliding friction. In sliding friction, f = μ × Fn, where μ is the coefficient of kinetic friction, which is related to the roughness of the brush and the rubber band, and Fn is the downward normal force of the brush 130 on the rubber band (since the rubber band is placed horizontally in the linear guide, the downward resisting force of the brush 130 on the rubber band is the downward normal force of the brush 130 on the rubber band).

[0054] With the height of the brush component 130 fixed, the dynamic friction force f between the brush component 130 and the rubber band is a constant. When the brush component 130 brushes the upper rubber band, due to the relatively high rotation speed of the brush component 130, such as Figure 10 As shown, the force exerted by the brush component 130 on the rubber band is fhair. fhair can be equivalent to the force fwall perpendicular to the inner wall of the linear guide groove 220 and the force fseparation along the axial direction of the linear guide groove 220. fwall causes the rubber band to abut against the inner wall of the linear guide groove 220, thus providing a certain limiting effect on the rubber band. This allows the two adhered rubber bands to better bear the force when brushed by the brush component 130, preventing the two adhered rubber bands from being brushed away. Brush 130 is directly brushed away. The force exerted by f on the upper rubber band causes the upper rubber band to move backward and separate from the lower rubber band. If the included angle β between the axis of brush 130 and the linear guide groove 220 is too large, the rubber band will be easily brushed away. If the included angle β is too small, the rubber band will be in excessive contact with the inner wall of the linear guide groove 220, affecting the conveying efficiency and even causing material blockage. Therefore, the included angle between the axis of brush 130 and the linear guide groove 220 is between 45 and 80 degrees.

[0055] In this embodiment of the invention, the screening section 340 includes a screening protrusion 341 with a circular cross-section, and the screening protrusion 341 is rotatably fixed along the inner wall of the hopper 310.

[0056] The circular cross-section screen protrusion 341 facilitates tangential fitting with the outer ring of the rubber band, and has good versatility and is easy to manufacture.

[0057] In this embodiment of the invention, the first feeding part includes a first feeding protrusion 331 perpendicular to the inner wall of the hopper 310. One end of the first feeding protrusion 331 rotates downward along the inner wall of the hopper 310 and connects to the inner bottom surface of the hopper 310. The other end of the first feeding protrusion 331 rotates upward along the inner wall of the hopper 310 and connects to the screening protrusion 341. The connection between the first feeding protrusion 331 and the screening protrusion 341 is uniformly transitioned.

[0058] The first feeding bump 331 is used for feeding the rubber band upward from the vibration disc, one end of the first feeding bump 331 is connected to the inner bottom surface of the hopper 310 along the inner wall of the hopper 310, which facilitates the transmission of the rubber band in the hopper 310 to the screening bump 341, and the connection between the first feeding bump 331 and the screening bump 341 is uniformly transitioned, so that the rubber band is better transmitted between the first feeding bump 331 and the screening bump 341.

[0059] In the embodiment of the present application, the second feeding part includes a second feeding bump 351 which is perpendicular to the inner wall of the hopper 310, one end of the second feeding bump 351 is connected to the screening bump 341 along the inner wall of the hopper 310, and the other end of the second feeding bump 351 is connected to the linear guide groove 220 along the inner wall of the hopper 310, and the connection between the second feeding bump 351 and the screening bump 341 is uniformly transitioned.

[0060] The second feeding bump 351 is used for feeding the rubber band upward from the screening bump 341, one end of the second feeding bump 351 is connected to the screening bump 341 along the inner wall of the hopper 310, which facilitates the transmission of the rubber band in the hopper 310 to the linear guide groove 220, and the connection between the second feeding bump 351 and the screening bump 341 is uniformly transitioned, so that the rubber band is better transmitted between the second feeding bump 351 and the screening bump 341.

[0061] In the embodiment of the present application, an arc-shaped transition part 410 is arranged between the second feeding bump 351 and the linear guide groove 220, the arc-shaped transition part 410 includes a first interface 411 which is communicated with the second feeding bump 351, a second interface 412 which is communicated with the linear guide groove 220, and an arc-shaped feeding part 414 which is communicated between the first interface 411 and the second interface 412, the curvature of the arc-shaped feeding part 414 is greater than the curvature of the inner wall of the hopper 310, a stop part 415 is arranged on the upper end of the side wall of the arc-shaped feeding part 414 and extends upward along the periphery of the arc-shaped feeding part 414, the stop part 415 extends to the second interface 412 and is communicated with the linear guide groove 220, and an air port piece is arranged above the arc-shaped feeding part 414 and blows air along the feeding direction of the rubber band.

[0062] During the feeding of the rubber band along the inner wall of the hopper 310, the arc-shaped feeding part 414 can shorten the feeding path of the rubber band, greatly improve the feeding efficiency of the rubber band, the air port piece can accelerate the feeding speed of the rubber band, further improve the feeding efficiency of the rubber band, and the stop part 415 can stop the accelerated rubber band, so as to prevent the rubber band from flying out of the hopper 310.

[0063] In the embodiment of the present application, a lower groove 221 is arranged at one end of the linear guide groove 220 which is connected to the second interface 412, the lower groove 221 penetrates the crosspiece part and the straight stop part 240, and the lower groove 221 is used for the installation of the brush piece 130.

[0064] This allows the brush part 130 to better engage and cooperate with the rubber band.

[0065] A fully automated rubber band feeding method, suitable for products with uniform quality in all parts, where the diameter is greater than the thickness, and the thickness is less than and close to one-seventeenth of the diameter, includes the following steps.

[0066] S1. A screening section 340 is provided on the wall of the feeding disc of the vibrating plate at a position relative to the predetermined feeding trajectory surface. The screening section 340 is tangentially abutted to the outer ring of the product, and the intersection of the abutments is located at one-quarter of the product thickness direction. When the inner wall of the feeding disc is at a predetermined value, only two adhesive rubber bands are allowed to pass through, while three or more mutually adhesive rubber bands will all fall back into the feeding disc due to gravity.

[0067] S2. After the screening section 340, at least one straight linear guide groove 220 is provided. The linear guide groove 220 has a feeding groove arranged in the horizontal direction. The rubber band moves forward in the feeding groove. A rotary screening device 100 that abuts and cooperates with the rubber band is provided above the feeding groove.

[0068] S3. The first screening state includes: the upper rubber band of the two bonded rubber bands is moved backward by the rotating screening device, and only a single layer of rubber band is allowed to pass between the rotating screening device and the linear guide groove 220.

[0069] S4. The second screening state includes: increasing the amplitude and / or speed of the vibrating plate in the horizontal direction while rotating the screening device and allowing only double-layer rubber bands to pass between them.

[0070] The movement of the rubber band on the vibratory feeder is an upward sliding motion along the feed channel 320, which can be simplified as a uniform motion along a cylindrical helix. The vibratory feeder separates the rubber band using two conveying methods: clockwise and counterclockwise, corresponding to left-hand and right-hand helical lines. The parametric equations of the rubber band's trajectory on the vibratory feeder are: x = acosθ, y = asinθ, z = ±bθ, where θ = ωt, ω is the angular velocity, and the equation is positive for the right-hand helix and negative for the left-hand helix. x and y are coordinate axes parallel to the plane of hopper 310, and z is a coordinate axis perpendicular to the plane of hopper 310. Decomposing the motion of the rubber band, its motion in the x and y planes is uniform circular motion, and its motion along the z-axis is uniform linear motion. For further details, please refer to Li Jinwei's paper "Parameter Design and Motion Analysis of Rubber Band Feed Channel 320 Based on Vibratory Feeder Separation" published in the "Beijing Printing Institute Journal," March 2023, Vol. 31, No. 3.

[0071] like Figure 7As shown, the elastic band makes uniform circular motion along the axis of the hopper 310 during the conveying process on the material channel 320, the angle between the inner wall of the hopper 310 and the horizontal direction is a known constant alpha, which is 85 here, according to the force analysis, the force acting on the elastic band is mainly the gravity G and the centrifugal force Foff (Foff is balanced with the interaction force between the elastic band and the inner wall of the hopper 310), the centrifugal force is a virtual force, which can be equivalent to the friction Fm of the elastic band to the upward trend of the inner wall of the hopper 310 and the abutting force F of the elastic band to the inner wall of the hopper 310;

[0072] According to the uniform circular motion formula, F (centripetal force) = mr4π^2n^2, where m is the product mass, r is the product motion radius, and n is the product speed, so by increasing the amplitude and / or speed of the vibration disc in the horizontal direction (vibration speed), the centripetal force F (i.e. Foff) can be increased, thereby increasing Fm;

[0073] As shown in the figure, Figure 6 When the three elastic bands are adhered together, the gravity acting on the elastic band is G, which can be equivalent to the abutting force F of the elastic band to the inner wall of the hopper 310 and the pressure F of the elastic band to the sieve material part 340, the condition for the three adhered elastic bands to pour into the vibration disc is that F makes the three adhered elastic bands have a tendency to turn right, when the centrifugal force Foff is increased by increasing the amplitude and / or speed of the vibration disc in the horizontal direction, since the centrifugal force F has a component along the direction of the inner wall of the hopper 310 upward, the increase of the centrifugal force F can reduce F, when the centrifugal force reaches a certain value, the three adhered elastic bands will not pour into the hopper 310, and only double-layer elastic bands are allowed to pass between the rotating sieve device and the straight guide groove 220, thereby completing the sieving of double-layer elastic bands.

[0074] Limited by the material of the vibration disc and the material of the motor 120 and the production cost, the amplitude and speed of the vibration disc cannot be increased indefinitely, and limited by the static friction between the elastic band and the vibration disc, the application object of the present application is the sieving of single-layer or double-layer elastic bands;

[0075] By controlling the working state of the vibration disc, the sieving can be conveniently adjusted, thereby facilitating the control of the discharge of single-layer or double-layer elastic bands, by increasing the material distribution device at the rear end of the straight guide groove 220 (weight / height distribution is a common means in the prior art, which will not be described here), the significance of double-layer elastic band discharge is that double-layer elastic band must be used in some use scenarios, and the present application can well perform the distribution.

[0076] The present application can be used for the sieving of single-layer or double-layer elastic bands, the principle is to perform primary sieving through the sieve material part 340 and secondary sieving through the brush piece 130, the sieving effect is good, and the overall structure is stable.

[0077] In one embodiment, the screening effect of the screening part 340 can be changed by changing the angle of the inner wall of the hopper 310, the smaller the angle, the more the rubber bands can be stuck.

[0078] In one embodiment, the screening effect of the screening part 340 can be changed by changing the intersection point of the screening part 340 and the tangent of the outer circle of the product, the farther the intersection point is from the inner wall of the hopper 310, the more the rubber bands can be stuck.

[0079] In one embodiment, the screening effect of the screening part 340 is related to the diameter of the rubber band, and the rubber band used in the present application has a diameter of 35 mm and a thickness of 2 mm.

[0080] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be carried out in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, it is to be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, and the scope of the present application is indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein. No reference signs in the claims should be considered to be a limitation on the scope of the claims.

Claims

1. A fully automatic rubber band dispensing structure, characterized in that, The system includes a machine base, on which a rotary screening device (100), a linear vibration device (200), and a vibrating plate device (300) are provided. The linear vibration device (200) includes a linear vibrator on the machine base and a vibrating seat (210) mounted on the linear vibrator. A linear guide groove (220) is provided on the vibrating seat (210). The vibrating plate device (300) includes a base on the machine base, on which an electromagnetic vibrator, a leaf spring, and a hopper (310) are provided. A spiral upward material channel (320) is provided inside the hopper (310). The rotary screening device (100) is located above the linear guide groove (220) and engages with the upper end face of the rubber band. The rotation direction of the rotary screening device (100) is opposite to the feeding direction of the rubber band on the linear guide groove (220). The sliding friction between the rotary screening device (100) and the rubber band is greater than the sliding friction between the linear guide groove (220) and the rubber band. The feed channel (320) includes a first feeding section (330), a screening section (340) and a second feeding section (350) that are connected to each other in sequence. The first feeding section (330) extends to the bottom of the vibrating plate, and the second feeding section (350) extends to the outlet and communicates with the linear guide groove (220). The bottom surface of the feed channel (320) of the screening section (340) is provided with an arc-shaped protrusion (360). The arc-shaped protrusion (360) is tangentially abutted to the outer ring of the rubber band, and the intersection of the abutment is located at one-quarter of the thickness direction of the rubber band. The rotary screening device (100) includes a motor bracket (110) fixed on a base, a motor (120) mounted on the motor bracket (110), and a brush (130) driven by the motor (120). The brush (130) is located above the linear guide groove (220). The brush (130) brushes against the upper end face of the rubber band, and the rotation direction of the brush (130) is opposite to the feeding direction of the rubber band on the linear guide groove (220). The distance between the brush (130) and the inner bottom surface of the linear guide groove (220) is greater than one times the thickness of the rubber band and less than two times the thickness of the rubber band. The sliding friction between the brush (130) and the rubber band is greater than the sliding friction between the linear guide groove (220) and the rubber band. An angle is provided between the axis of the brush part (130) and the axis of the linear guide groove (220), the angle being less than (80) degrees and greater than (45) degrees; The screening section (340) includes a screening protrusion (341) with a circular cross-section, which is fixedly mounted to rotate along the inner wall of the hopper (310).

2. The fully automatic rubber band dispensing structure according to claim 1, characterized in that, The straight guide groove (220) is provided with L-shaped blocks (230) on both sides. The L-shaped blocks (230) include a straight block (240) that abuts against the outer ring of the rubber band and a horizontal block (250) that abuts against the upper end face of the rubber band. The straight block (240), the horizontal block (250) and the vibrating seat (210) cooperate to form the straight guide groove (220). The height of the straight guide groove (220) is greater than twice the thickness of the rubber band. The distance from the rotating screening device (100) to the inner bottom surface of the straight guide groove (220) is greater than one times the thickness of the rubber band and less than twice the thickness of the rubber band.

3. The fully automatic rubber band dispensing structure according to any one of claims 1-2, characterized in that, The first feeding part includes a first feeding protrusion (331) perpendicular to the inner wall of the hopper (310). One end of the first feeding protrusion (331) rotates downward along the inner wall of the hopper (310) and connects to the inner bottom surface of the hopper (310). The other end of the first feeding protrusion (331) rotates upward along the inner wall of the hopper (310) and connects to the screening protrusion (341). The connection between the first feeding protrusion (331) and the screening protrusion (341) is uniformly transitioned.

4. The fully automatic rubber band dispensing structure according to claim 3, characterized in that, The second feeding section includes a second feeding protrusion (351) perpendicular to the inner wall of the hopper (310). One end of the second feeding protrusion rotates downward along the inner wall of the hopper and connects to the screening protrusion (341). The other end of the second feeding protrusion rotates upward along the inner wall of the hopper and connects to the linear guide groove (220). The connection between the second feeding protrusion and the screening protrusion is uniformly transitioned.

5. The fully automatic rubber band dispensing structure according to claim 4, characterized in that, An arc-shaped transition section (410) is provided between the second feeding protrusion (351) and the linear guide groove (220). The arc-shaped transition section (410) includes a first interface (411) communicating with the second feeding protrusion (351), a second interface (412) communicating with the linear guide groove (220), and an arc-shaped feeding section (414) communicating between the first interface (411) and the second interface (412). The curvature of the arc-shaped feeding section (414) is greater than the curvature of the inner wall of the hopper (310). The upper end of the side wall of the arc-shaped feeding section (414) is provided with a stop (415) arranged upward along the periphery of the arc-shaped feeding section (414). The stop (415) extends towards the second interface (412) and communicates with the linear guide groove (220). An air vent is provided above the arc-shaped feeding section (414) to blow air along the direction of the rubber band conveying.

6. The fully automatic rubber band dispensing structure according to claim 5, characterized in that, A lower slot (221) is provided at one end of the linear guide groove (220) that is connected to the second interface (412). The lower slot (221) passes through the horizontal stop and the vertical stop (240) and is used for the installation of the brush part (130).

7. A fully automatic rubber band feeding method, suitable for products with uniform quality in all parts, where the diameter of the product is greater than its thickness, and the thickness of the product is less than and close to one-seventeenth of the diameter of the product, characterized in that, An automatic rubber band dispensing structure applicable to any one of claims 1-6 includes the following steps: S1. A screening section (340) is provided on the wall of the feeding disc of the vibrating plate at a position relative to the predetermined feeding trajectory surface. The screening section (340) is tangentially abutted to the outer ring of the product and the intersection of the abutments is located at one-quarter of the product thickness direction. When the inner wall of the feeding disc is at a predetermined value, only two adhesive rubber bands are allowed to pass through, while three or more mutually adhesive rubber bands will all fall back into the feeding disc due to gravity. S2. After the screening section (340), at least one straight linear guide groove (220) is provided. The linear guide groove (220) has a feeding groove arranged in the horizontal direction. The rubber band moves forward in the feeding groove. A rotary screening device (100) that abuts and cooperates with the rubber band is provided above the feeding groove. S3. The first screening state includes: the upper rubber band of the two bonded rubber bands is moved backward by the rotating screening device, and only a single layer of rubber band is allowed to pass between the rotating screening device and the linear guide groove (220); S4. The second screening state includes: increasing the amplitude and / or speed of the vibrating plate in the horizontal direction while rotating the screening device and allowing only double-layer rubber bands to pass between them.

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