A cap dotting device and its dotting method

Abstract

The present invention discloses a cap dotting device and a dotting method thereof, which includes a chassis. A plurality of second push blocks are slidably connected to the upper end of the chassis. A first push block is fixedly connected to the outside of the second push block and can slide in the same direction. A main shaft is connected to the center of the chassis. A lifting table is arranged below the chassis. The lifting table includes lifting table bodies on both sides. The lifting table bodies can slide up and down along the outer wall of the first boss. The lifting table body includes a convex ring at the upper end. The cap is placed horizontally with the opening facing inwards. When the first push block is located on the outside, the upward movement of the convex ring can convey the cap to between the first push block and the second push block. The first push block pushes the cap inwards. A top block for dotting the upper ring wall of the cap is arranged above the cap. A feeding mechanism for conveying the cap and a cylinder two located outside the bottom of the feeding mechanism are arranged outside the chassis. The cap dotting device of the present invention is not prone to tilting during dotting, has a relatively low cost of pushing the cap by using a cylinder, feeds the cap while dotting the cap, and has high production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of cap dotting, and in particular to a cap dotting device and a dotting method thereof. Background Art

[0002] Currently, the simplest installation method for caps is the insertion type. Therefore, it is necessary to dot one side of the circumferential wall of the cap, so that a protrusion is formed on the inner side of the circumferential wall, and a concave point is provided on the corresponding bottle mouth. After the cap is inserted, its protrusion is inserted into the corresponding concave point to limit the cap and prevent the cap from easily coming off. Currently, the automated production line for cap dotting usually adopts a linear conveying form, with the cap placed with the opening facing downwards, and the cap is dotted from the side. When dotting from the side, since the ejector rod cantilever extends out, the distal end is prone to slightly sag, resulting in the sag of the protrusion after dotting, affecting the appearance. Moreover, placing the cap with the opening facing downwards requires the assistance of a manipulator to grasp, which incurs a relatively high cost. Therefore, it is necessary to improve the dotting method and reduce the equipment cost. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and provide a cap dotting device and a dotting method thereof, which are not prone to tilting during dotting, have a relatively low cost by using a cylinder to push the cap, and can feed while dotting the cap, with high production efficiency.

[0004] To achieve the above object, the technical solution of the present invention is:

[0005] A bottle cap dotting device, comprising a chassis. A plurality of second push blocks are slidably connected to the upper end of the chassis. The second push blocks are circumferentially distributed along one side of the chassis. A first push block is fixedly connected to the outside of the second push block and can slide in the same radial direction along the chassis. A main shaft is connected to the center of the chassis. A lifting platform is arranged below the chassis. The lifting platform includes lifting platform bodies on both sides. There are first bosses on both sides of the main shaft. The first bosses are inserted into the inner sides of the lifting platform bodies. The lifting platform bodies can slide up and down along the outer walls of the first bosses. The lifting platform bodies include convex rings at the upper ends. A plurality of bottle caps can be placed circumferentially on the upper ends of the convex rings. The bottle caps are placed horizontally with the openings facing inwards. When the first push block is located on the outside, the upward movement of the convex ring can transport the bottle caps to between the first push block and the second push block. The first push block pushes the bottle caps inwards. A top block is arranged above the bottle caps and can dot the upper ring walls of the bottle caps. A feeding mechanism for transporting the bottle caps and a second cylinder located outside the bottom of the feeding mechanism are arranged outside the chassis. The feeding mechanism is located on the side of the chassis away from the first push block; Cylinders are installed on both sides of the main shaft. The output ends of the cylinders are fixed to the lifting platform; Convex ring grooves are circumferentially distributed on the upper ends of the convex rings. The inner walls of the convex ring grooves match the outer walls of the bottle caps. Part of the outer walls of the bottle caps fits against the inner walls of the convex ring grooves; A second fixing block is installed on the upper end of the chassis. A sleeve is sleeved outside the second fixing block. The inner walls of the second push blocks can slide along the outer walls of the sleeve. After the first push block pushes the bottle caps inwards, the bottle caps are sleeved on the sleeve, and the inner bottom surfaces of the bottle caps abut against the outer end surfaces of the second push blocks; The main shaft is connected to a stepping motor, and the stepping motor drives the main shaft to rotate; The second cylinder pushes the bottle caps at the bottom of the feeding mechanism into the convex ring grooves at the upper ends of the convex rings and squeezes out the bottle caps originally located in the convex ring grooves from the inside of the convex rings. When one side of the convex ring is at the upper limit position, the other side of the convex ring is at the lower limit position.

[0006] A first fixing block is installed on the upper end of the chassis. A plurality of tension springs are fixedly connected to the outside of the first fixing block. The other ends of the tension springs are fixed to the inner sides of the second push blocks. The first push block includes an extension part at the upper end. An inclined surface is arranged inside the extension part. A pressing block is arranged above the first push block. The pressing block can move up and down through a third cylinder connected above. The pressing block includes a pressing block cone part at the bottom. The pressing block cone part abuts against the inclined surface. When the pressing block moves upwards, the pressing block cone part pushes the first push block and the second push block to move outwards, and the tension springs are stretched.

[0007] A pressing plate is installed on the pressing block. A plurality of pressing columns are connected to the lower end of the pressing plate. A connecting block is installed on the upper end of the second push block. A top block is installed on the connecting block. The top block is inserted into the connecting block. The bottom of the top block is located above the bottle cap dotting position.

[0008] The connecting block includes an upper wall at the upper end. The top block includes a top block end part at the upper end. The top block end part is located above the upper wall. A spring is sleeved on the top block. The upper end of the spring abuts against the top block end part, and the lower end abuts against the upper wall.

[0009] A retaining ring is connected to the lower end of the chassis. The outside of the retaining ring can abut against the inside of the bottle cap, and the retaining ring can be bent inwards.

[0010] The lifting table is provided with a first annular hole and a second annular hole located below and communicating with the first annular hole. The first annular hole is located below the inner side of the convex ring, and a receiving hopper for recycling the capped caps after dotting is arranged below the second annular hole.

[0011] A method for dotting caps, including a cap dotting device, comprises the following steps:

[0012] S1 Dotting:

[0013] ① The main body of the lifting table on one side rises, and the convex ring moves upward so that the cap is located between the first push block and the second push block;

[0014] ② The pressing block descends, the tension spring pulls the second push block to move inward, the first push block pushes the cap inward, and the cap is inserted into the sleeve;

[0015] ③ The pressing block descends, causing the pressing column to push the top block downward to dot the cap;

[0016] S2 Feeding: While the main body of the lifting table on one side rises, the main body of the lifting table on the other side descends, and the output end of the second cylinder ejects so that the cap at the bottom of the feeding mechanism enters the convex ring groove at the upper end of the convex ring;

[0017] ① The second cylinder retracts, the pressing block rises, causing the first push block and the second push block to move outward, and the cap moves to the upper end of the convex ring;

[0018] ② The stepping motor rotates 30 degrees.

[0019] The beneficial effects of the present invention are:

[0020] When dotting the cap, it is placed horizontally and dotted from top to bottom. The protruding direction is downward and the same as the dotting direction. It is not easy to tilt when dotting downward, so the dotting is relatively correct. At the same time, when positioning the cap, it is fixed by horizontal pushing of the cylinder, and the cost is relatively low.

[0021] The lifting table for placing the cap is composed of two separated main bodies of the lifting table. When the main body of one side of the lifting table is performing dotting operation, the main body of the other side of the lifting table is feeding, and the working efficiency is relatively high. And the feeding and discharging are carried out in the same area, making the overall structure of the equipment compact and saving floor space. Description of the Drawings

[0022] Figure 1 It is a cross-sectional view of the embodiment;

[0023] Figure 2 It is Figure 1 The enlarged view of A in

[0024] Figure 3 It is Figure 2 The enlarged view of B in

[0025] Figure 4Schematic diagram of the connection between the second pushing block and the chassis in the embodiment;

[0026] Figure 5 Partial sectional view of the convex ring and the bottle cap in the embodiment;

[0027] Figure 6 Stereogram of the sleeve in the embodiment;

[0028] Figure 7 Top view schematic diagram of the first annular hole and the second annular hole in the embodiment;

[0029] Figure 8 Top view position distribution schematic diagram of the first pushing block, the second pushing block, the feeding mechanism, and the second cylinder in the embodiment.

[0030] In the figure: base 1, stepper motor 11, main shaft 12, first convex platform 121, first cylinder 122, chassis 13, first groove 131, retaining ring 132, first fixing block 14, tension spring 141, second fixing block 15, sleeve 151, annular groove 1511, straight groove 1512, protruding part 152, material receiving hopper 16, material receiving hopper cavity 161, second cylinder 17, straight hole 18, lifting platform 2, lifting platform main body 21, first annular hole 211, second annular hole 212, second groove 213, convex ring 214, convex ring groove 2141, first pushing block 3, first pushing block pushing part 31, cushion ring 311, extension part 32, inclined surface 321, through hole 322, connecting component 33, second pushing block 4, second pushing block pushing part 41, sliding part 42, connecting block 43, upper wall 431, top block 44, top block end 441, spring 45, feeding mechanism 5, third cylinder 6, pressing block 61, pressing block conical part 611, pressing plate 62, pressing column 621, bottle cap 7, convex point 71, support seat 8, sliding groove 81. Detailed implementation manners

[0031] The technical solutions of the present invention will be further described below through embodiments and in conjunction with the accompanying drawings.

[0032] As Figures 1 - 8 shown, a bottle cap dotting device includes a base 1. A stepper motor 11 is installed at the bottom of the base 1. The upper end of the stepper motor 11 is connected to a main shaft 12. The upper end of the main shaft 12 is connected to a chassis 13. The main shaft 12 is inserted into the chassis 13 and connected through a bearing. The main shaft 12 and the chassis 13 are coaxial. The stepper motor 11 drives the main shaft 12 to rotate around the axis of the chassis 13.

[0033] As Figure 1 、 8 shown, a plurality of second pushing blocks 4 are slidably connected to the upper end of the chassis 13. The second pushing blocks 4 are circumferentially evenly distributed along one side of the chassis 13. Preferably, there are 6 second pushing blocks 4, and the included angle between two adjacent second pushing blocks 4 is 30 degrees. As Figure 4As shown, the second pushing block 4 is in a gate shape. The second pushing block 4 includes a second pushing part 41 at the upper end and a sliding part 42 at the lower end of the second pushing part 41. The second pushing part 41 is in a semi-circular structure. The sliding part 42 extends downward along both sides of the second pushing part 41. The bottom of the sliding part 42 is in an inverted T-shaped structure. A first groove 131 is provided on the upper end surface of the chassis 13. The length direction of the first groove 131 is parallel to the radial direction of the chassis 13. The first groove 131 extends to the outer end of the circumference of the chassis 13. The inverted T-shaped structure at the bottom of the sliding part 42 is inserted into the first groove 131 from the outer end of the circumference of the chassis 13 and can slide along the inner wall of the first groove 131.

[0034] A first fixing block 14 is installed on the upper end of the chassis 13. The first fixing block 14 is located at the center of the chassis 13. A plurality of tension springs 141 are fixedly connected to the outside of the first fixing block 14. The tension springs 141 correspond to the sliding parts 42 one by one. The other ends of the tension springs 141 are fixedly connected to the inner sides of the sliding parts 42. When the sliding parts 42 move outward, the tension springs 141 elongate. When the sliding parts 42 are in the inner limit position, the tension springs 141 are in a free elongation state.

[0035] As Figure 1 、 2 、shown in Figure 8, a first pushing block 3 is fixedly connected to the outside of the second pushing block 4 and can slide in the same radial direction of the chassis 13. Specifically, a support seat 8 is installed on the base 1. The support seat 8 is provided with a sliding groove 81. The bottom of the first pushing block 3 is inserted into the sliding groove 81 and can move along the sliding groove 81. The first pushing block 3 includes an extension part 32 at the upper end and a first pushing part 31 below the extension part 32. The extension part 32 extends inward along the inner wall of the upper part of the first pushing block 3. The first pushing part 31 extends inward along the inner wall of the lower part of the first pushing block 3. A cushion ring 311 is adhered to the inner side of the first pushing part 31. The cushion ring 311 is a rubber pad and has elasticity.

[0036] The extension part 32 is located above the second pushing block 4. The upper end of the extension part 32 is inserted into a connecting component 33. The connecting component 33 can be a screw. The bottom of the connecting component 33 is fixedly connected to the upper end of the second pushing part 41, so that the first pushing block 3 and the second pushing block are fixed and move in unison.

[0037] Above the fixed block 14, there is a pressing block 61. The pressing block 61 is located inside the first pushing block 3. The pressing block 61 can move up and down through the upper end connected to the cylinder three 6. Inside the extension part 32, there is an inclined surface 321. The inclined surface 321 inclines outward and downward. The pressing block 61 includes a pressing block cone part 611 at the bottom. The diameter of the pressing block cone part 611 is smaller at the upper end and larger at the lower end. The pressing block cone part 611 abuts against the inclined surface 321. When the pressing block 61 moves upward, the pressing block cone part 611 pushes the first pushing block 3 and the second pushing block 4 to move outward, and the tension spring 141 is stretched. When the pressing block 61 moves downward, the tension spring 141 pulls the second pushing block 4 and the first pushing block 3 back until the upper end of the inclined surface 321 is flush with the upper end of the pressing block cone part 611. At this time, when the pressing block 61 continues to move downward, the second pushing block 4 and the first pushing block 3 will no longer move inward.

[0038] As Figure 1 , 2 , Figures 5 and 7 show that a lifting platform 2 is provided below the chassis 13. The main body of the lifting platform 2 is a cylindrical structure. On the outer periphery of the upper end face of the cylinder of the lifting platform 2, a convex ring 214 protrudes upward. The convex ring 214 is a circular ring structure. There are a plurality of convex ring grooves 2141 on the convex ring 214. The convex ring grooves 2141 are evenly distributed along the circumference of the upper end of the convex ring 214. A bottle cap 7 can be placed in the convex ring grooves 2141. The bottle cap 7 is made of metal. The convex ring grooves 2141 are recessed downward along the upper end of the convex ring 214 into an arc shape. The radius of this arc is the same as that of the bottle cap 7. The outer wall of the bottle cap 7 is placed in contact with the inner wall of the convex ring groove 2141. The bottle cap 7 is placed horizontally, and the opening direction of the bottle cap 7 points to the center of the lifting platform 2. The lifting platform 2 is coaxial with both the chassis 13 and the main shaft 12. After the bottle cap 7 is placed, along the radial direction of the convex ring 214, both the inner and outer sides of the bottle cap 7 are located inside the convex ring 214.

[0039] The main shaft 12 passes through the center of the lifting platform 2. The lifting platform 2 includes lifting platform bodies 21 on both sides. The lifting platform bodies 21 are semi-circular structures. Inside the lifting platform bodies 21, there are grooves two 213. The grooves two 213 are recessed outward along the inner sides of the lifting platform bodies 21 and penetrate in the up and down directions. On both sides of the outer wall of the main shaft 12, there are convex platforms one 121. The convex platforms one 121 protrude outward along the outer wall of the main shaft 12 and the width is matched with the width of the grooves two 213. The convex platforms one 121 are inserted into the grooves two 213, and the lifting platform bodies 21 can slide up and down along the outer walls of the convex platforms one 121.

[0040] On both sides of the main shaft 12, a first cylinder 122 is installed. The first cylinder 122 is located above the cylinder body of the lifting table 2 and inside the inner wall of the convex ring 214. The output end of the first cylinder 122 is fixed to the upper end of the cylinder body of the lifting table 2. The first cylinder 122 pushes the lifting table 2 to move up and down, and the first cylinder 122 can rotate together with the main shaft 12. A single first cylinder 122 controls the lifting table body 21 on one side. When the corresponding lifting table body 21 is lowered to the lower limit position by the extension of the output end of the first cylinder 122 on one side, the output end of the first cylinder 122 on the other side retracts to raise the corresponding lifting table body 21 to the upper limit position.

[0041] The lifting table 2 is provided with a first annular hole 211 and a second annular hole 212 which is located below the first annular hole 211 and communicated with it. The first annular hole 211 is located inside and below the convex ring 214. The first annular hole 211 is a guiding hole with a large upper opening and a gradually narrowing lower opening. The outer side of the first annular hole 211 is close to the inner bottom of the convex ring 214. The bottle cap 7 at the upper end of the convex ring 214 can fall into the first annular hole 211 after falling from the inside. The base 1 is provided with a straight hole 18. The upper end of the straight hole 18 is communicated with the second annular hole 212 and the first annular hole 211. A receiving hopper 16 for recycling the bottle caps 7 after dotting is arranged below the straight hole 18. The upper end of the receiving hopper 16 is provided with a receiving hopper cavity 161, and the bottle cap 7 can fall into the receiving hopper cavity 161. A conveyor belt can also be arranged below the straight hole 18 to convey the bottle caps 7 to the next process.

[0042] As Figure 2 、 3 shown, a second fixing block 15 is installed at the upper end of the chassis 13. The second fixing block 15 corresponds to the second pushing block 4 one by one. The second fixing block 15 includes a protruding portion 152 located on the outside. The protruding portion 152 extends outward from the upper outer wall of the second fixing block 15 into a column shape and its axis is along the radial direction of the chassis 13. The outer side of the protruding portion 152 is press-fitted with a sleeve 151. The inner side of the sleeve 151 abuts against the lower part of the second fixing block 15. As Figure 6 shown, the sleeve 151 includes an annular groove 1511 and a straight groove 1512. The annular groove 1511 is an annular groove recessed inward along the outer wall of the sleeve 151. The annular groove 1511 is located on the side close to the second fixing block 15. The straight groove 1512 is recessed inward along the outer wall of the sleeve 151. The straight groove 1512 penetrates through the end face on the side of the sleeve 151 far from the second fixing block 15, and the other side is communicated with the annular groove 1511. After installation, the straight groove 1512 is located at the top of the sleeve 151.

[0043] The outer diameter of the sleeve 151 is the same as the inner diameter of the second pushing portion 41 of the second pushing block 4. The inner wall of the second pushing portion 41 can slide along the outer wall of the sleeve 151.

[0044] A connecting block 43 is installed at the upper end of the second pushing block 4. The connecting block 43 is formed by bending one side of a thin-walled straight plate by 90 degrees. One end of the connecting block 43 is fixed to the upper end of the second pushing block 4, and the other end is an upper wall 431 located at the upper end. The upper wall 431 is located above the second pushing block 4 and is parallel to the top of the second pushing block 4. A top block 44 is inserted and installed on the upper wall 431. The top block 44 includes a top block end 441 located at the upper end. The bottom of the top block 44 is inserted into the upper wall 431 and extends below the upper wall 431. The top block end 441 is located above the upper wall 431. A spring 45 is sleeved on the top block 44. The upper end of the spring 45 abuts against the top block end 441, and the lower end abuts against the upper end face of the upper wall 431.

[0045] A pressing plate 62 is further installed on the pressing block 61. The pressing plate 62 is of a disc structure. The pressing plate 62 is located above the conical part 611 of the pressing block. A plurality of pressing columns 621 are connected to the lower end of the pressing plate 62. The extension part 32 is provided with a through hole 322. The through hole 322 penetrates up and down and extends in a strip shape along the chassis 13. The pressing columns 621 pass through the through hole 322 and correspond to the top blocks 44 one by one. When the pressing block 61 moves downward, it drives the pressing columns 621 to move downward. The bottom of the pressing columns 621 presses down the top blocks 44, the spring 45 is compressed, when the pressing columns 621 move upward, the spring 45 rebounds to push up the top blocks 44.

[0046] A retaining ring 132 is connected to the lower end of the chassis 13. The outer side of the retaining ring 132 can abut against the inner side of the bottle cap 7. The retaining ring 132 is a silicone sheet and can be bent inward.

[0047] As Figure 1 、 8 shown, a feeding mechanism 5 for conveying the bottle cap 7 and a cylinder two 17 located outside the bottom of the feeding mechanism 5 are arranged on the outer side of the chassis 13. There are 6 feeding mechanisms 5 and they are circumferentially distributed along the center of the chassis 13. The adjacent feeding mechanisms 5 are spaced 30 degrees apart, and the feeding mechanism 5 and the adjacent first pushing block 3 are spaced 30 degrees apart. The bottoms of the feeding mechanism 5 and the cylinder two 17 are both located on the upper end surface of the base 1.

[0048] The specific working principle is as follows:

[0049] When the lifting table main body 21 on one side rises, the convex ring 214 moves upward to convey the bottle cap 7 between the first pushing block 3 and the second pushing block 4. The bottom of the convex ring 214 is flush with the upper end surface of the chassis 13. The pressing block 61 descends, the tension spring 141 pulls the second pushing block 4 to move inward, the first pushing block 3 pushes the bottle cap 7 inward, the bottle cap 7 is inserted into the sleeve 151, and the inner side of the top wall of the bottle cap 7 abuts against the outer end face of the sleeve 151. At this time, the dotting position of the bottle cap 7 is located below the top block 44. The pressing block 61 continues to descend, so that the pressing column 621 pushes the top block 44 downward to dot the bottle cap 7. After dotting, a convex point 71 is formed on the inner ring wall of the bottle cap 7. The convex point 71 protrudes inward from the inner ring wall of the bottle cap 7 and is located in the annular groove 1511.

[0050] While the lifting platform main body 21 on one side rises, the lifting platform main body 21 on the other side descends. The convex ring 214 moves downward until its upper end face is flush with the upper end face of the base 1. The bottle caps 7 in the feeding mechanism 5 are arranged vertically with their openings facing inward. The output end of the second cylinder 17 ejects to push the bottle caps 7 at the bottom of the feeding mechanism 5 into the convex ring groove 2141 on the upper end of the convex ring 214, and squeezes out the bottle caps 7 originally located in the convex ring groove 2141 from the inner side of the convex ring 214. After being squeezed out, the bottle caps 7 enter the material receiving hopper 16.

[0051] The second cylinder 17 retracts, and the bottle caps 7 of the feeding mechanism 5 move downward as a whole. The pressing block 61 rises to move the first push block 3 and the second push block 4 outward. The second push block 4 pushes the bottle cap 7 to move to the upper end of the convex ring 214. The stepping motor 11 rotates 30 degrees to repeat the above steps. After all the bottle caps 7 on one side of the convex ring 214 are marked, the unmarked bottle caps 7 are placed on the other side of the convex ring 214. The stepping motor 11 rotates 180 degrees, and the positions of the two lifting platform main bodies 21 are interchanged, so as to perform the above marking operation again.

[0052] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cap dotting device, characterized in that: It includes a chassis (13). A plurality of second push blocks (4) are slidably connected to the upper end of the chassis (13). The second push blocks (4) are circumferentially and evenly distributed along one side of the chassis (13). A first push block (3) is fixedly connected to the outside of the second push block (4) and can slide in the same radial direction along the chassis (13). A main shaft (12) is connected to the center of the chassis (13). A lifting platform (2) is arranged below the chassis (13). The lifting platform (2) includes lifting platform bodies (21) on both sides. There are first bosses (121) on both sides of the main shaft (12). The first bosses (121) are inserted into the inner sides of the lifting platform bodies (21). The lifting platform bodies (21) can slide up and down along the outer walls of the first bosses (121). The lifting platform bodies (21) include convex rings (214) at the upper ends. A plurality of bottle caps (7) can be placed along the circumference at the upper end of the convex rings (214). The bottle caps (7) are placed horizontally with the openings facing inwards. When the first push block (3) is located on the outside, the upward movement of the convex ring (214) can convey the bottle caps (7) between the first push block (3) and the second push block (4). The first push block (3) pushes the bottle caps (7) inwards. A top block (44) is arranged above the bottle caps (7) and can punch the upper ring walls of the bottle caps (7). A feeding mechanism (5) for conveying the bottle caps (7) and a second cylinder (17) located outside the bottom of the feeding mechanism (5) are arranged outside the chassis (13). The feeding mechanism (5) is located on one side of the chassis (13) away from the first push block (3). First cylinders (122) are installed on both sides of the main shaft (12). The output ends of the first cylinders (122) are fixed to the lifting platform (2). Convex ring grooves (2141) are circumferentially and evenly distributed at the upper end of the convex ring (214). The inner walls of the convex ring grooves (2141) match the outer walls of the bottle caps (7). Part of the outer walls of the bottle caps (7) are attached to the inner walls of the convex ring grooves (2141). A second fixing block (15) is installed at the upper end of the chassis (13). A sleeve (151) is sleeved outside the second fixing block (15). The inner walls of the second push blocks (4) can slide along the outer walls of the sleeve (151). After the first push block (3) pushes the bottle caps (7) inwards, the bottle caps (7) are sleeved on the sleeve (151). The inner bottom surfaces of the bottle caps (7) abut against the outer end faces of the second push blocks (4). The main shaft (12) is connected to a stepping motor (11), and the stepping motor (11) drives the main shaft (12) to rotate. The second cylinder (17) pushes the bottle caps (7) at the bottom of the feeding mechanism (5) into the convex ring grooves (2141) at the upper end of the convex ring (214), and squeezes the bottle caps (7) originally located in the convex ring grooves (2141) out from the inside of the convex ring (214). When one side of the convex ring (214) is at the upper limit position, the other side of the convex ring (214) is at the lower limit position.

2. The capping dotting device according to claim 1, characterized in that: A fixing block one (14) is installed at the upper end of the chassis (13). A plurality of tension springs (141) are fixedly connected to the outside of the fixing block one (14). The other ends of the tension springs (141) are fixed to the inner side of the second push block (4). The first push block (3) includes an extension part (32) at the upper end. An inclined surface (321) is provided inside the extension part (32). A pressing block (61) is arranged above the first push block (3). The pressing block (61) can move up and down through a connecting air cylinder three (6) above. The pressing block (61) includes a pressing block cone part (611) at the bottom. The pressing block cone part (611) abuts against the inclined surface (321). When the pressing block (61) moves upward, the pressing block cone part (611) pushes the first push block (3) and the second push block (4) to move outward, and the tension springs (141) are stretched.

3. The capping dotting device according to claim 2, characterized in that: A pressing plate (62) is installed on the pressing block (61). A plurality of pressing columns (621) are connected to the lower end of the pressing plate (62). A connecting block (43) is installed at the upper end of the second push block (4). A top block (44) is installed on the connecting block (43). The top block (44) is inserted into the connecting block (43). The bottom of the top block (44) is located above the dotting position of the bottle cap (7).

4. The cap dotting device according to claim 3, wherein: The connecting block (43) includes an upper wall (431) at the upper end. The top block (44) includes a top block end part (441) at the upper end. The top block end part (441) is located above the upper wall (431). A spring (45) is sleeved on the top block (44). The upper end of the spring (45) abuts against the top block end part (441), and the lower end abuts against the upper wall (431).

5. The capping dotting device according to claim 1, wherein: A retaining ring (132) is connected to the lower end of the chassis (13). The outside of the retaining ring (132) can abut against the inner side of the bottle cap (7). The retaining ring (132) can be bent inward.

6. The capping dotting device according to claim 1, characterized in that: The lifting platform (2) is provided with a first annular hole (211) and a second annular hole (212) which is located below and communicated with the first annular hole (211). The first annular hole (211) is located below the inner side of the convex ring (214). A material receiving hopper (16) for recycling the bottle cap (7) after dotting is arranged below the second annular hole (212).

7. A method for dotting a bottle cap, comprising the bottle cap dotting device described in claim 3, characterized in that: Including the following steps: S1 Dotting: ① The lifting platform main body (21) on one side rises, and the convex ring (214) moves upward so that the bottle cap (7) is located between the first push block (3) and the second push block (4); ② The pressing block (61) descends. The tension spring (141) pulls the second push block (4) to move inward. The first push block (3) pushes the bottle cap (7) inward, and the bottle cap (7) is inserted into the sleeve (151); ③ The pressing block (61) descends so that the pressing column (621) pushes the top block (44) to press the bottle cap (7) for dotting; S2 Feeding: While one side of the lifting table main body (21) rises, the other side of the lifting table main body (21) descends, and the output end of the second cylinder (17) ejects to make the bottle cap (7) at the bottom of the feeding mechanism (5) enter the annular groove (2141) at the upper end of the annular rib (214). ① The second cylinder (17) retracts, and the pressing block (61) rises to make the first push block (3) and the second push block (4) move outward, and the bottle cap (7) moves to the upper end of the annular rib (214). ② The stepping motor (11) rotates 30 degrees.

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