High-speed servo paper cup making machine

Abstract

A high-speed servo paper cup making machine, comprising a paper suction and conveying mechanism (1), a paper tube forming mechanism (2), a cup bottom forming turntable (3), and a cup mouth forming turntable (4), wherein the paper suction and conveying mechanism (1), the paper tube forming mechanism (2), the cup bottom forming turntable (3) and the cup mouth forming turntable (4) are sequentially connected to each other in a conveying manner; the cup bottom forming turntable (3) is provided with a cup loading station (31), a paper tube bottom preheating station (32), a cup bottom forming station (33), a bottom rolling station (34), a knurling station (35) and a mold changing station (36) which are sequentially arranged in the conveying direction; and the cup bottom forming turntable (3) is linked to the cup mouth forming turntable (4) via the mold changing station (36). The process of first loading the cup tube and then preheating the bottom of the paper cup tube before the forming of the conveyed cup bottom and the cup tube eliminates the need for the preheating waiting procedure after the bottom forming, which can simplify the mold on the turntable, and can also make the mold material lighter to reduce the overall weight of the cup bottom forming turntable (3), such that the power torque of the cup bottom forming turntable (3) is increased, thereby reducing the equipment cost.

Description

A high-speed servo paper cup machine Technical Field

[0001] The present invention relates to the field of paper cup machines, and in particular to a high-speed servo paper cup machine. Background Art

[0002] A paper cup machine is generally a forming device for paper cups, paper bowls and other paper containers. After the cup wall is initially formed, it needs to be sent to a male mold for processing and then to a female mold for forming and demolding. Both the male and female molds are provided with multiple forming stations. The paper cups need to be switched between stations by rotating the male and female mold turntables. The upper mold on the male mold (such as a vertical state) is distributed and installed on the turntable and rotates with the male mold turntable. The cylinder of the paper cup is sleeved on the upper mold, and the upper mold rotates with the turntable, carrying the cylinder to each station for corresponding processing and production. After the cylinder is connected to the bottom of the cup, the bottom is formed. In the prior art, the male mold turntable and the female mold turntable are It is connected to the main power source of the host through a mechanical structure transmission. For example, the Chinese invention patent with publication number CN100577404C, entitled "A Paper Cup Machine", has a "T"-shaped frame and discloses a paper cup machine, including a paper feeding and slitting mechanism, a cup body forming and cup removing mechanism, a cup feeding mechanism, a multi-station indexing turntable, and a transmission mechanism. The multi-station indexing turntable includes a bottom feeding station, a bottom rolling station, a cup bottom knurling station, a cup mouth curling station, and a cup discharge station. The multi-station indexing turntable is provided with a main indexing turntable and a sub-indexing turntable. The bottom feeding station, bottom rolling station, and cup bottom knurling station are arranged on the main indexing turntable.

[0003] The manual discloses that "at the bottom feeding station, the paper for paper cups passes between the upper cutting die and the pressing plate. Under the action of the transmission mechanism, the push rod pushes the lower cutting die mounting plate upward through the connecting sleeve, thereby pushing the lower cutting die and the pressing plate upward. The pressing plate presses the paper for paper cups tightly against the lower end surface of the upper cutting die. At this time, the push rod continues to move upward, the lower cutting die contacts the cutting edge of the upper cutting die, and the cup bottom is blanked. Then, the bottom feeding rod moves upward under the action of the transmission device, pushing the unformed cup bottom into the forming die, where the cup bottom is formed. The bottom feeding rod continues upward, feeding the formed cup bottom into the paper cup body. This station setting requires feeding the bottom paper to form the bottom first, then placing the cup tube, completing the cup bottom blanking, and then raising the bottom feeding rod to feed it into the paper cup body above. This means that during the bottom paper forming process, the paper sheet on the cup bottom needs to be adsorbed or stuck. If it gets stuck, the upper cup mold needs to be made of steel, otherwise the material will oxidize quickly. If it gets stuck, the next station needs to push the cup bottom out. The mechanical structure is complex and requires a cup bottom clamping device and a bottom pushing device, which will increase the cost of the equipment.

[0004] After the cup tube is enclosed and formed, it needs to be transferred upward to the mold on the cup body's male mold turntable. The existing upper cup mold primarily consists of a main mold body, a steel insert, a (bottom) push plate 620, a return spring (used to reset the push plate 620), and a shaft head retaining ring. The bottom of the main mold body also requires a recess 621 (forming a concave bottom structure) to accommodate the push plate's movable position. This push plate pushes the cup bottom downward to facilitate demolding the paper cup. The internal structure of the upper cup mold is complex, requiring high installation requirements. The various components are difficult to manufacture, and preventing air leaks is challenging if ventilation is required. Furthermore, because the upper cup mold has a recessed bottom (i.e., a concave bottom) to accommodate the preformed cup bottom paper sheet, a relatively thin upper cup mold sidewall portion 622 with a bottom recess 621 exists between the cup bottom paper sheet and the tube body. This thin sidewall still presents a significant risk of leakage at the connection between the cup bottom paper sheet and the tube body.

[0005] Therefore, there is a need for a paper cup machine with optimized workstation layout, which can set more workstations on the same size or even smaller frame, optimize the production process, save equipment costs, and further optimize the structure of the upper cup mold. Summary of the Invention

[0006] The present invention aims at solving the shortcomings of the prior art and provides a high-speed servo paper cup machine.

[0007] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0008] A high-speed servo paper cup machine includes a frame, on which are provided a paper suction and feeding mechanism, a paper tube forming mechanism, a cup bottom forming turntable and a cup mouth forming turntable, which are sequentially conveyed and connected, and the cup bottom forming turntable and the cup mouth forming turntable are respectively connected to servo motors that drive them to rotate, a plurality of upper molds are suspended at the bottom of the cup bottom forming turntable corresponding to each station, and a plurality of lower molds are provided on the cup mouth forming turntable corresponding to each station, and the cup bottom forming turntable is sequentially provided with a cup loading station, a paper tube bottom preheating station, a cup bottom forming station, a bottom rolling station, a knurling station and a mold changing station along the conveying direction of the cup bottom forming turntable; the paper tube on the upper mold is preheated in the paper tube bottom preheating station, enters the cup bottom forming station and is connected to the cup bottom, and the cup bottom forming turntable and the cup mouth forming turntable are connected through the mold changing station.

[0009] Preferably, the upper mold includes a main mold body with an integrated structure, the bottom of the main mold body is a bottom plane, the circumferential side of the main mold body is a barrel sleeve surface, the main mold body is provided with a discharge demoulding air outlet hole, the discharge demoulding air outlet hole is arranged on the barrel sleeve surface, the main mold body is provided with a discharge demoulding air channel, the discharge demoulding air channel is connected to the discharge demoulding air outlet hole, and the main mold body is also provided with a discharge demoulding air inlet, and the discharge demoulding air inlet is connected to the discharge demoulding air channel.

[0010] An annular groove is also provided on the sleeve surface of the main mold body. The annular groove is arranged in at least two circles on the main mold body, and the annular grooves are arranged parallel to each other up and down; an exhaust channel is also provided on the main mold body that passes through the upper and lower parts, and one port of the exhaust channel is located on the bottom plane of the main mold body, and the other port of the exhaust channel is located on the top of the main mold body.

[0011] Preferably, the mold changing station is arranged on both the cup bottom forming turntable and the cup mouth forming turntable, and the cup mouth forming turntable is circumferentially provided with a mold changing station, a cup mouth lubrication station, a cup mouth pre-rolling station, a cup mouth forming station, an in-cup inspection station or a three-pass rolling station, a defective cup discharge station and a finished product cup discharge station.

[0012] Preferably, the first cup bottom heating station and the second cup bottom heating station are arranged between the cup bottom forming station and the bottom rolling station, the cup body inspection station is arranged between the knurling station and the mold changing station, nine working stations and a reserved station are arranged on the cup bottom forming turntable, and eight stations are arranged circumferentially on the cup mouth forming turntable.

[0013] Preferably, a cup bottom forming device is provided at the bottom of the cup bottom forming station, and the cup bottom forming device is connected to a bottom paper conveying device and a waste paper discharge device, and the waste paper discharge device extends from between the first cup bottom heating station and the second cup bottom heating station.

[0014] Preferably, the paper suction and feeding mechanism includes a suction device for sucking out the paper sheets and a pushing device for pushing out the paper sheets. A paper heating device is provided on the side of the pushing device. The paper tube forming mechanism includes a clamping device, an ultrasonic welding device and a cup tube transfer device for hooking out the cup tube. The cup tube transfer device is connected to the cup loading station through a cup loading robot.

[0015] Preferably, the cup bottom forming turntable and the cup mouth forming turntable are independently provided with servo motors, a main power source and three parallel transmission shafts connected to the main power source are provided under the frame, and the paper suction and feeding mechanism, the paper tube forming mechanism, the cup bottom forming turntable and the cup mouth forming turntable all include devices connected to the transmission shafts.

[0016] Preferably, cup bottom hot air devices are provided at corresponding positions of the paper tube bottom preheating station, the first cup bottom heating station and the second cup bottom heating station. The cup bottom hot air device includes a heating hood and a hot air generating device. A cavity for the cup bottom to enter is provided in the heating hood, and a hot air head is provided at the bottom of the cavity. The feature is that a hot air duct is fixedly connected to the bottom of the hot air head, the hot air generating device includes an air outlet pipe, the outlet end of the air outlet pipe is connected to the hot air duct, and the hot air duct can be raised and lowered relative to the hot air generating device to adjust the size of the air path connected between the output air duct and the hot air duct.

[0017] Preferably, an adjustment seat is fixedly installed at the outlet end of the hot air generating device, and the hot air duct is slidably arranged in the adjustment seat. The adjustment seat has a sealed cavity, and the cavity connects the hot air duct and the hot air generating device. A regulating valve is provided at the air outlet pipe of the hot air generating device, and the hot air duct is connected to the regulating valve. The lifting movement of the hot air duct drives the regulating valve to move, thereby changing the opening of the regulating valve.

[0018] Due to the adoption of the above technical solutions, the present invention has significant technical effects: a new workstation arrangement is adopted, the cup barrel is put on first, and the cup barrel is sent from another direction for preheating, and the part to be connected with the cup bottom is heated first to facilitate subsequent fixation, and then the bottom is sent to make the bottom, and then two heating steps are performed, and finally the bottom is rolled and knurled to form. The conical inner wall structure of the mold used to clamp the cup bottom in the cup barrel can be omitted, and other lightweight materials can be used instead of stainless steel. Therefore, the weight of the mold can be made lighter, the torque of the cup bottom forming turntable is reduced, the turntable can be operated faster, and the support plate area is reduced. Due to the increase in strength, it can adapt to the speed increase of the overall processing of the machine, so that the strength and speed are adapted.

[0019] This innovative process layout utilizes a three-step hot air forming process for the cup base, improving its quality. An optional in-cup inspection function further ensures cup quality, and defective cups are removed via a cup discharge device at the defective cup discharge station. This process layout allows for the production of different sizes of paper cups using molds. The modular design optimizes space utilization, resulting in a compact frame structure that significantly reduces machine length.

[0020] The bottom of the upper cup mold is a bottom plane and does not need to be additionally recessed inward (no concave bottom structure). Demolding also utilizes the discharge demoulding vents to cooperate with the exhaust to blow the paper cup to demould (separate and unload). There is no need to set an additional bottom push plate at the bottom of the main mold body. The discharge demoulding air inlet, discharge demoulding air channel, and discharge demoulding vents cooperate to form an air path structure that is relatively simple. There is no concave bottom structure and no bottom push plate for demoulding. The structure is relatively simpler and the processing and manufacturing are more convenient. It meets the paper cup molding requirements during paper cup molding and is relatively easy to install and debug. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a top view of the present invention. Figure 2 is a top view of the cup bottom forming turntable and the cup mouth forming turntable of the present invention. Figure 3 is a top view of the paper suction and feeding mechanism and the paper tube forming mechanism of the present invention. Figure 4 is a structural schematic diagram of the arrangement of the upper mold and the lower mold. Figure 5 is a top structural schematic diagram of the upper cup mold. Figure 6 is a cross-sectional view of FF in Figure 5. Figure 7 is a cross-sectional view of GG in Figure 5. Figure 8 is a stereoscopic view of Figure 5. Figure 9 is the upper cup mold of the paper cup forming machine in the background technology. Figure 10 is a structural schematic diagram of the cup bottom hot air device. Figure 11 is a longitudinal cross-sectional view of the cup bottom hot air device. Figure 12 is a structural schematic diagram of the cup bottom hot air device from another angle. Figure 13 is a manufacturing flow chart of the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings and embodiments. Example

[0023] A high-speed servo paper cup machine, as shown in Figures 1-4, includes a frame, on which are provided a paper suction and feeding mechanism 1, a paper tube forming mechanism 2, a cup bottom forming turntable 3, and a cup mouth forming turntable 4. The paper suction and feeding mechanism 1, the paper tube forming mechanism 2, the cup bottom forming turntable 3, and the cup mouth forming turntable 4 are sequentially connected for conveying. The cup bottom forming turntable 3 and the cup mouth forming turntable 4 are respectively connected to a servo motor 8 for driving their rotation. A plurality of upper molds 6 are suspended at the bottom of the cup bottom forming turntable 3 corresponding to each station. Several lower molds 7 are provided on the cup mouth forming turntable 4 corresponding to each station, and the cup bottom forming turntable 3 is provided with a cup loading station 31, a paper tube bottom preheating station 32, a cup bottom forming station 33, a bottom rolling station 34, a knurling station 35 and a mold changing station 36 in sequence along the conveying direction; the paper tube on the upper mold 6 is preheated in the paper tube bottom preheating station 32 and then enters the cup bottom forming station 33 to be connected with the cup bottom, and the cup bottom forming turntable 3 and the cup mouth forming turntable 4 are connected through the mold changing station 36.

[0024] The paper suction and feeding mechanism 1 and the paper tube forming mechanism 2 are arranged in a "7" shape with the cup bottom forming turntable 3 and the cup mouth forming turntable 4. The cup bottom forming turntable 3 is provided with nine working stations and a reserved station, and the cup mouth forming turntable is provided with eight stations along its circumference. The cup bottom forming turntable 3 and the cup mouth forming turntable 4 rotate in opposite directions. A cup bottom forming device 331 is provided at the bottom of the cup bottom forming station 33. The cup bottom forming device 331 is connected to a bottom paper conveying device 332 and a waste paper discharge device 333. The waste paper discharge device 333 extends between the first cup bottom heating station 37 and the second cup bottom heating station 38.

[0025] The mold-changing station 36 is located on both the base-forming turntable 3 and the rim-forming turntable 4. The rim-forming turntable 4 is circumferentially equipped with the mold-changing station 36, a rim lubrication station 41, a rim pre-rolling station 42, a rim-forming station 43, an in-cup inspection station 44 or a three-pass rim-rolling station, a defective-cup discharge station 45, and a finished-cup discharge station 46. Between the base-forming station 33 and the rim-rolling station 34 are located the first and second base-heating stations 37 and 38. A cup-body inspection station 39 is located between the knurling station 35 and the mold-changing station 36.

[0026] As shown in Figure 13, the paper suction and feeding mechanism 1 includes a suction device 11 for sucking out paper sheets and a pushing device 12 for pushing out paper sheets. A paper heating device 13 is provided on the side of the pushing device 12. The paper tube forming mechanism 2 includes a clamping device 21, a cup tube connecting device 22 and a cup tube transferring device 23 for hooking out the cup tube. The cup tube transferring device 23 is connected to the cup loading station 31 through the cup loading robot 311. The base paper is coated with PE on one or both sides through a laminating machine, resulting in coated paper. This imparts waterproof, oil-proof, and heat-sealable properties. Therefore, in paper cup production, paper sheets can be transported by suction nozzles. Single sheets from the hopper are sucked by the paper feeding mechanism 1 and transferred to a horizontal conveyor rack. The paper sheets are then pushed out by the pushing mechanism 12 to the paper tube forming mechanism. During the production process, a clamping device 21 is required to form the paper sheets into tubes according to the intermediate mold. The cup-tube connecting device 22 then secures the tube walls through heating or mechanical means. Common cup-tube connecting devices include ultrasonic welding devices. Ultrasonic welding relies on mechanical vibration to generate mechanical pressure between material molecules, releasing heat to soften and bond the PE film within the paper, thus connecting the paper tubes. The cup tube transfer device 23 receives the formed cup tubes, which are then received by the upper cup robot and transported to the cup base forming turntable 3. The cup tubes are then fixed to the mold on the cup base forming turntable 3, where they are gradually formed into the cup base.

[0027] The cup-loading station 31, cup-bottom-forming station 33, bottom-rolling station 34, knurling station 35, and mold-changing station 36, as well as the paper tube bottom preheating station 32, first cup bottom heating station 37, and second cup bottom heating station 38, are all equipped with corresponding heating devices, typically hot air devices. A robotic arm transports the cups to the cup-loading station 31. The cup bottom-forming station 33 features a bottom-cutting and forming device that cuts the paper into the desired shape and then pushes it onto the bottom of the cup tube for connection. Due to the limitations of the mold, the paper has a skirt that folds outward. The bottom-rolling station 34 and knurling station 35 each fold and curl the cup bottom inward. The knurling device at the knurling station can also emboss patterns by rolling and securing the cup bottom and paper tube. The mold-changing station 36 transfers the paper to another mold by connecting the molds of two turntables. The cup rim lubrication station 41, cup rim pre-rolling station 42, and cup rim forming station 43 are equipped with cup rim lubrication devices, cup rim pre-rolling devices, and cup rim forming devices, respectively. The defective cup discharge station 45 and the finished cup discharge station 46 use a cup ejection device below to eject the cup bodies. The cups are typically transported by flying cups, but can also be collected by other means. The above-mentioned processing devices are mature technologies well known to those skilled in the art. However, the present invention achieves its intended purpose through a different station layout than the existing technology. Therefore, the structure of the processing devices will not be described in detail.

[0028] The cup bottom forming turntable 3 and the cup mouth forming turntable 4 are each independently equipped with a servo motor. A main power source and three parallel transmission shafts connected to the main power source are located below the frame. The main power source is a motor, which drives the three transmission shafts to rotate through gear transmission or other linkage methods, thereby driving the linked devices on the transmission shafts to reciprocate back and forth or move up and down. No linkage shaft extending in the forward and backward directions is provided, and instead, the cup bottom forming turntable 3 and the cup mouth forming turntable 4 are each independently equipped with a servo motor structure. The frame is arranged in a "7" shape rather than a "T" shape, reducing the space occupied by the entire machine from front to back. The paper suction and feeding mechanism 1, the paper tube forming mechanism 2, the cup bottom forming turntable 3, and the cup mouth forming turntable 4 all include devices connected to the transmission shafts. The finishing transmission mechanism adopts a three-transverse axis design. Since the primary transmission shaft, the first driven shaft, and the second driven shaft are all parallel to each other, there is no need to reserve space for transmission in the other direction. The modular design can make better use of space and shorten the length of the machine.

[0029] The upper cup mold, as shown in Figures 5-9, includes a main mold body 61 with an integrated structure, that is, the main mold body 61 is an integral structure; wherein, the bottom of the main mold body 61 is a bottom plane 62, which does not need to be recessed inward to form a concave bottom structure, has a simple structure, and is relatively easy to manufacture. The circumferential side surface of the main mold body 61 is a barrel sleeve surface 63, and the barrel sleeve surface 63 can be provided for the paper cup barrel to be sleeved thereon. When the paper cup barrel is sleeved on the main mold body 61, it is located outside the barrel sleeve surface 63.

[0030] In addition, the main mold body 61 is provided with a discharge and demoulding air outlet 64, which is arranged on the barrel sleeve surface 63. The discharge and demoulding air outlet 64 is used to cooperate with the air outlet, and the paper cups mounted on the outer surface of the barrel sleeve surface 63 are blown by the air outlet, so as to cooperate with the unloading and demoulding (separation and removal) of the paper cups mounted on the outer surface of the barrel sleeve surface 63. The main mold body 61 has an air channel, and the discharge and demoulding air channel 65 is connected to the discharge and demoulding air outlet 64. The main mold body 61 is also provided with a discharge and demoulding air inlet 66, which is connected to the discharge and demoulding air channel 65. The discharge and demoulding air inlet 66 is used to access gas (air source) to cooperate with blowing. The discharge and demoulding air inlet 66 and the discharge and demoulding air outlet 64 are connected by the discharge and demoulding air channel 65. The gas passes through the discharge and demoulding air channel 65 and is output from the discharge and demoulding air outlet 64 to cooperate with blowing to discharge and demould the paper cup.

[0031] The following optimization or further explanation may be performed based on the above embodiments.

[0032] For example, an annular groove 67 is further provided on the barrel sleeve surface 63 of the main mold body 61. The annular groove 67 is provided in at least two circles on the main mold body 61. The annular grooves 67 are arranged parallel to each other in an upper and lower direction. The annular grooves 67 are provided on the barrel sleeve surface 63 to reduce the contact surface with the paper cup paper tube. While ensuring sufficient support effect of the main mold body 61, the contact surface is reduced, friction is reduced, and air discharge (blowing) and demolding are smoother and more successful.

[0033] Further optimization can be achieved by providing an exhaust channel 68 on the main mold body 61. The exhaust channel 68 runs vertically through the main mold body 61. One end 69 of the exhaust channel 68 is located on the bottom plane 62 of the main mold body 61, and the other end 610 of the exhaust channel 68 is located on the top of the main mold body 61. This streamlined structure allows the exhaust channel 68 to promptly exhaust air during assembly of the cup base and the body (i.e., the cup body), thereby reducing the problem of leakage caused by poor adhesion between the bottom of the paper cup (the cup base and the body).

[0034] Another optimization option is to locate the discharge and demoulding vent 64 in the annular groove 67 of the main mold body 61. When the cylinder body is sleeved on the cylinder sleeve surface 63 of the main mold body 61 to form a paper cup, the discharge and demoulding vent 64 will first fill the annular groove 67 with air, and then blow the paper cup out of the annular groove 67 for discharge and demoulding. The annular groove 67 has a pressure stabilizing effect, making the air pressure more stable during the discharge and demoulding of the paper cup, and the paper cup separation is more stable.

[0035] Furthermore, the discharge and demolding air holes 64 can be evenly distributed along the circumference. This allows the air holes 64 to blow air through the paper cups, ensuring a more balanced discharge and smoother release. While the main mold body 61 is shown as a rotating body, this is not limited to a circular shape and can also be square, a square-like shape, or an elliptical shape.

[0036] For another example, the unloading and demoulding vent holes 64 can be distributed and evenly distributed in the same annular groove 67. The unloading and demoulding vent holes 64 are arranged in the same annular groove 67, which is relatively convenient to process and has a relatively simple structure. It can quickly and evenly form the air pressure for unloading and demoulding in the annular groove 67.

[0037] In addition, the unloading and demoulding air outlet 64 can be set obliquely downward outward to blow the paper cup obliquely downward outward, so that the paper cup moves downward smoothly, quickly and stably.

[0038] During use, for example, the upper cup mold of the paper cup forming machine, which has no concave bottom and no bottom push plate, is installed on the turntable of the paper cup forming machine. The upper cup mold is in a vertical position. The paper cup forming machine fits the paper cup barrel onto the barrel sleeve surface 63 of the upper cup mold (located on its outer surface). The bottom of the barrel extends downward beyond the upper cup mold, and the barrel has a surplus space enclosed by the barrel below the bottom plane 62 of the main mold body 61. The paper cup forming machine inserts the cup bottom (paper) into the surplus space, and then performs bottom rolling, rolling, or expanding the cup bottom. During demolding, gas is input into the discharge demolding air inlet 66. After passing through the discharge demolding air flow, the gas is discharged through the discharge demolding air outlet 64 for blowing. This upper cup mold can meet the paper cup forming requirements during paper cup molding and is relatively easy to install and debug.

[0039] The upper cup mold of the paper cup forming machine has no concave bottom and no bottom push plate. Its bottom is a bottom plane 62 and does not need to be additionally concave inward (no concave bottom structure). Demolding also uses the discharge demoulding air outlet 64 to cooperate with the exhaust air to blow the paper cup out of the mold (separate and unload). There is no need to set an additional bottom push plate at the bottom of the main mold body 61. The discharge demoulding air inlet 66, the discharge demoulding air channel 65, and the discharge demoulding air outlet 64 cooperate to form an air path structure that is relatively simple. There is no concave bottom structure and no need for a bottom push plate for demoulding. The structure is relatively simpler and the processing and manufacturing are more convenient. It meets the paper cup molding requirements during paper cup molding and is relatively easy to install and debug.

[0040] There are many ways to form the discharge and demoulding air channel 65. For example, the discharge and demoulding air channel 65 includes a vertical channel 611 and an oblique channel 612. The oblique channel 612 is connected to the vertical channel 611, and the upper end of the vertical channel 611 is set as the discharge and demoulding air inlet 66. The inlet of the discharge and demoulding air inlet 66 is set upward, so that each upper cup mold can be supplied with air for demoulding at the paper cup demoulding station of the paper cup forming machine by the lifting air nozzle above the demoulding station. The vertical channel 611 is located in the center of the main mold body 61, and the oblique channel 612 is connected to the side of the vertical channel 611. The discharge and demoulding air channel 65 mainly consists of the vertical channel 611 and the oblique channel 612, which is easy to process and can be made by punching the corresponding channels and the connection between the channels.

[0041] A mounting portion 613 can also be connected to the upper end of the main mold body 61. The mounting portion 613 (e.g., a flange) is used for assembly and connection. The mounting portion 613 can be provided with corresponding mounting holes 614 for connection, such as connection to a turntable of a paper cup forming machine. Furthermore, the mounting portion 613 and the main mold body 61 can be integrally formed.

[0042] There is a surplus space for the cylinder body below the bottom plane 62 of the main mold body 61. When the paper cup forming machine puts the paper cup cylinder body on the cylinder body setting surface 63 of the upper cup mold (located on its outer surface), the bottom of the cylinder body extends downward beyond the bottom plane 62 of the upper cup mold. The cylinder body has a surplus space for the cylinder body below the bottom plane 62 of the main mold body 61. The paper cup forming machine inserts the pre-formed cup bottom (paper) into the surplus space, and then the paper cup forming machine rolls the bottom and rolls or expands the cup bottom.

[0043] The cup bottom hot air device of the paper cup machine, as shown in Figures 10-12, includes a heating cover 51 and a hot air generating device 52. A cavity 511 for the bottom of the cup to enter is provided in the heating cover 51. A hot air head 53 is provided at the bottom of the cavity 511. A hot air duct 54 is fixedly connected to the bottom of the hot air head 53. The hot air generating device 52 includes an air outlet pipe 521. The outlet end of the air outlet pipe 521 is connected to the hot air duct 54. The hot air duct 54 can move up and down relative to the hot air generating device 52 to adjust the size of the air path connecting the output air pipe 521 and the hot air duct 54.

[0044] As shown in Figure 11, the adjustment seat 55 includes a limiting portion 551 at the top and a lateral connecting portion 552. The bottom of the hot air duct 54 is inserted into the limiting portion 551 and can extend into the cavity of the adjustment seat 55. The inner wall of the limiting portion 551 is provided with a bearing sleeve 553 for slidingly guiding the hot air duct 54. The connecting portion 552 is connected to the air outlet pipe 521.

[0045] A duct fixing seat 541 is fixedly installed outside the hot air duct 54 , and the duct fixing seat 541 is connected to a lifting power source.

[0046] As shown in Figure 12, the hot air generating device 52 includes a fixed mounting plate 523 for securing to the frame. The fixed mounting plate 523 can be secured to the frame by bolts or by a clamp. The hot air generating device can be a heat gun, a hot air pump, or the like. A cold air duct 524 for introducing cold air is provided on the side of the hot air generating device 52 away from the hot air duct 54. Cold air is pumped into the cold air duct by an air pump. The hot air generating device 52 heats the cold air and then outputs it through the air outlet duct 521.

[0047] A fixing plate 56 is provided at the bottom of the adjustment seat 55 . The fixing plate 56 and the adjustment seat 55 are fixed by connecting bolts 561 . The connecting bolts 561 are sleeved with an adjusting spring 562 at a position located at the bottom of the fixing plate 56 .

[0048] The heating cover 51 is provided with an exhaust port 512 for exhausting hot air on the other side of the hot air head 53.

[0049] Working principle: In the pretreatment of forming and bonding the bottom of the paper cup, there will be one or more stations to preheat the bottom of the paper cup for its subsequent processing. Hot air is generally used to heat the heating cover, and then the paper cup or the bottom of the paper cup is transferred to the hot air device for preheating.

[0050] An adjustment seat 55 is fixedly installed at the outlet end of the hot air generating device 52, and a hot air duct 54 is slidably arranged in the adjustment seat 55. The adjustment seat 55 has a sealed cavity, and the cavity connects the hot air duct 54 and the hot air generating device 52. One embodiment of adjusting the air output is that when the hot air duct 54 descends, it blocks part of the air output of the air outlet pipe 521 to adjust the size of the air path. Another embodiment is that a regulating valve 522 is provided at the air outlet pipe 521 of the hot air generating device 52, and the hot air duct 54 is connected to the regulating valve 522. The regulating valve can be a baffle type, blocking the outlet of the hot air generating device 52. The lifting movement of the hot air duct 54 drives the regulating valve 522 to operate, changing the opening of the regulating valve 522. The purpose is to achieve the increase of the air output when the hot air head 53 rises, and the decrease of the air output when the hot air head 53 falls.

[0051] When there is a cup or a cup bottom on the heating cover 51, the heating cover 51 rises, and the hot air head 53 will contact the cup bottom for preheating, heating the cup bottom in its cavity 511, and the hot air generating device 52 continuously provides hot air. At this time, the exhaust port 512 also discharges hot air at the same time to avoid internal overheating; when there is no cup on the heating cover 51, when the heating cover 52 descends, the air outlet of the hot air generating device 52 is closed, which can reduce energy consumption and avoid overheating of the heating cover, which causes paper pieces to stick. After the air outlet is closed, maintaining a small amount of wind can achieve a better heating effect on the mold.

Claims

1. A high-speed servo paper cup machine, comprising a frame, on which there are provided a paper suction and feeding mechanism (1), a paper tube forming mechanism (2), a cup bottom forming turntable (3) and a cup mouth forming turntable (4). The paper suction and feeding mechanism (1), the paper tube forming mechanism (2), the cup bottom forming turntable (3) and the cup mouth forming turntable (4) are connected in sequence for conveying. The cup bottom forming turntable (3) and the cup mouth forming turntable (4) are respectively connected to servo motors (8) that drive them to rotate. A number of upper molds (6) are suspended corresponding to each working station at the bottom of the cup bottom forming turntable (3), and a number of lower molds (7) are provided corresponding to each working station on the cup mouth forming turntable (4), and it is characterized in that: The cup bottom forming turntable (3) is sequentially provided with an upper cup station (31), a bottom paper tube preheating station (32), a cup bottom forming station (33), a bottom rolling station (34), a knurling station (35) and a die changing station (36) along the circumferential direction in the conveying direction; the paper tube on the upper die (6) enters the cup bottom forming station (33) to be connected with the cup bottom after being preheated at the bottom paper tube preheating station (32), and the cup bottom forming turntable (3) is connected with the cup mouth forming turntable (4) through the die changing station (36).

2. The paper cup forming machine based on a servo motor according to claim 1, characterized in that: The upper die (6) includes a main die body (61) with an integral structure. The bottom of the main die body (61) is a bottom plane (62), the circumferential side of the main die body (61) is a cylinder sleeve surface (63), a discharge and demoulding air hole (64) is arranged on the main die body (61), the discharge and demoulding air hole (64) is arranged on the cylinder sleeve surface (63), a discharge and demoulding air channel (65) is arranged in the main die body (61), the discharge and demoulding air channel (65) is connected with the discharge and demoulding air hole (64), and a discharge and demoulding air inlet (66) is also arranged on the main die body (61), and the discharge and demoulding air inlet (66) is connected with the discharge and demoulding air channel (65).

3. The paper cup forming machine based on a servo motor according to claim 2, wherein: An annular groove (67) is also arranged on the cylinder sleeve surface (63) of the main die body (61). The annular groove (67) is arranged at least in two circles on the main die body (61), and the annular grooves (67) are arranged in parallel up and down with each other; an exhaust channel (68) penetrating up and down is also arranged on the main die body (61). One port of the exhaust channel (68) is located on the bottom plane (62) of the main die body (61), and the other port of the exhaust channel (68) is located at the top of the main die body (61).

4. A paper cup forming machine based on a servo motor according to claim 1, wherein: The die changing station (36) is arranged on both the cup bottom forming turntable (3) and the cup mouth forming turntable (4) at the same time. The cup mouth forming turntable (4) is circumferentially provided with a die changing station (36), a cup mouth lubricating station (41), a cup mouth pre-rolling station (42), a cup mouth forming station (43), an in-cup detection station (44) or a three-way curling station, a defective product discharging station (45) and a finished product discharging station (46).

5. A paper cup forming machine based on a servo motor according to claim 1, characterized in that: A first cup bottom heating station (37) and a second cup bottom heating station (38) are arranged between the cup bottom forming station (33) and the bottom rolling station (34). A cup body detection station (39) is arranged between the knurling station (35) and the die changing station (36). There are nine working stations and reserved stations arranged on the cup bottom forming turntable (3), and eight stations are circumferentially arranged on the cup mouth forming turntable (4).

6. The paper cup forming machine based on a servo motor according to claim 5, wherein: A cup bottom forming device (331) is arranged at the bottom of the cup bottom forming station (33). The cup bottom forming device (331) is connected with a bottom paper conveying device (332) and a waste paper discharging device (333). The waste paper discharging device (333) extends out between the first cup bottom heating station (37) and the second cup bottom heating station (38).

7. A paper cup forming machine based on a servo motor according to claim 1, characterized in that: The paper suction and feeding mechanism (1) comprises a suction device (11) for sucking out paper sheets and a pushing device (12) for pushing out paper sheets, and a paper sheet heating device (13) is arranged on the side of the pushing device (12). The paper tube forming mechanism (2) comprises a clamping device (21), an ultrasonic welding device (22) and a cup tube transfer device (23) for hooking out the cup tube, and the cup tube transfer device (23) is connected to the cup loading station (31) through a cup loading robot (311).

8. A paper cup forming machine based on a servo motor according to claim 1, characterized in that: A servo motor is independently arranged on the cup bottom forming turntable (3) and the cup mouth forming turntable (4), a main power source and three parallel transmission shafts connected to the main power source are arranged below the frame, and the paper suction and feeding mechanism (1), the paper tube forming mechanism (2), the cup bottom forming turntable (3) and the cup mouth forming turntable (4) all include a device connected to the transmission shaft.

9. A paper cup forming machine based on a servo motor according to claim 1 or 5, characterized in that: A cup bottom hot air device (5) is arranged at the corresponding positions of the paper tube bottom preheating station (32), the first cup bottom heating station (37), and the second cup bottom heating station (38). The cup bottom hot air device (5) comprises a heating cover (51) and a hot air generating device (52). A cavity (511) for the cup bottom to enter is arranged in the heating cover (51). A hot air head (53) is arranged at the bottom of the cavity (511). The hot air head (53) is characterized in that a hot air duct (54) is fixedly connected to the bottom of the hot air head (53). The hot air generating device (52) comprises an air outlet pipe (521). The outlet end of the air outlet pipe (521) is connected to the hot air duct (54). The hot air duct (54) can move up and down relative to the hot air generating device (52) to adjust the size of the air path connected between the air outlet pipe (521) and the hot air duct (54).

10. A paper cup forming machine based on a servo motor according to claim 9, characterized in that: An adjusting seat (55) is fixedly mounted at the outlet end of the hot air generating device (52), a hot air duct (54) is slidably mounted in the adjusting seat (55), a sealed cavity is provided in the adjusting seat (55), the cavity connects the hot air duct (54) and the hot air generating device (52), an adjusting valve (522) is provided at the air outlet pipe (521) of the hot air generating device (52), the hot air duct (54) is connected to the adjusting valve (522), and the lifting movement of the hot air duct (54) drives the adjusting valve (522) to move, thereby changing the opening of the adjusting valve (522).

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