Automatic bottom punching device for bottom of paper cup

Abstract

The invention provides an automatic bottom punching device for the bottom of a paper cup, and belongs to the technical field of paper cup production and processing, the automatic bottom punching device comprises a supporting frame and a conveying frame, the conveying frame is connected with a winding roller and a paper unwinding roller, the upper end of the conveying frame is provided with a supporting plate and a punching head, the automatic bottom punching device further comprises a blanking assembly and a bottom punching assembly, the tensioning assembly is used for tensioning the paper; the device has the beneficial effects that balls on the inner sides of the arc-shaped plates can make contact with the outer walls of the stamping heads under the action of the moving plates, the sliding rods and the buffer springs, it is ensured that the arc-shaped plates can be attached to the outer walls of the stamping heads with different diameters in a self-adaptive mode, the tensioning assemblies are driven to apply tensioning force to body paper, the body paper is prevented from loosening or shifting in the stamping process, and the stamping quality is improved. Therefore, the position precision of stamping and cutting and the forming quality of the cup bottom are guaranteed, finally stable cutting of the stamping head is achieved, and the risk of damage during body paper processing is reduced while the processing precision is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of paper cup production and processing, and in particular to an automatic bottom punching device for paper cups. Background Art

[0002] A paper cup is a paper container made by mechanically processing and gluing base paper (white cardboard) made from chemical wood pulp. It has a cup-shaped appearance. Paper cups for frozen foods are coated with wax and can hold ice cream, jam, butter, etc.; paper cups for hot drinks are coated with plastic and can withstand temperatures above 90°C and can even hold boiling water. Paper cups are disposable items. They are safe, hygienic, lightweight and convenient, so they are widely used in public places, hotels, restaurants, beverage shops and other occasions.

[0003] During the production and processing of paper cups, a food-grade paper roll used to produce the cup body is first hung on the feed inlet in preparation for the printing operation. The machine will blend the pigment color according to the parameters configured by the engineers. The blended pigment will flow from another feed inlet to a roller engraved with a pattern. After the paper passes through the roller, it will be neatly printed with a pattern. The patterned paper will enter the punching machine from one side, and the paper without a pattern will enter the other side to produce the cup bottom. However, the existing bottom punching device mostly uses a fixed tensioning roller structure, which is not convenient for adapting to punching heads of different diameters. When the cup bottom specifications are changed, it needs to be readjusted, and the adjustment accuracy is insufficient, resulting in loosening or offset of the base paper during punching, causing deviation in the cutting position of the cup bottom. In addition, the tensioning and punching of the traditional device are carried out simultaneously. The base paper is punched when it is not fully tensioned, resulting in warping of the edge of the cup bottom after forming. It is not convenient to adapt to the processing requirements of different types of base paper and has limitations. How to invent an automatic bottom punching device for paper cups to solve these problems has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] In order to make up for the above shortcomings, the present invention provides an automatic bottom punching device for paper cups, which aims to solve the problem that the existing tensioning device is not convenient for adapting to punching heads of different diameters, resulting in loosening or deviation of the base paper during punching, causing deviation in the cutting position of the cup bottom. In addition, the traditional device performs tensioning and punching simultaneously, which easily leads to warping of the edge of the cup bottom after forming.

[0005] The present invention is achieved in that:

[0006] The present invention provides an automatic bottom punching device for paper cups, comprising a support frame and a conveyor frame, wherein the conveyor frame is connected to a winding roller and a paper discharge roller, and the upper end of the conveyor frame is provided with a support plate and a punching head, and further comprising:

[0007] A punching assembly connected to the support plate, the punching assembly being used for punching the base paper;

[0008] A tensioning assembly is connected to the conveying frame and is used for tensioning the paper.

[0009] Preferably, the conveying frame is fixedly connected to the upper end of the support frame, a movable groove is opened on the upper side wall of the conveying frame, a sliding rod is fixedly connected to the inner wall of the movable groove, and buffer springs are provided at both ends of the sliding rod. The conveying frame is fixedly connected to the support plate, and the support plate is located in the middle position between the winding roller and the paper release roller.

[0010] Preferably, the punching assembly includes a cylinder and a fixed plate, the cylinder is fixedly connected to the support plate, one end of the cylinder passes through the side wall of the support plate and is fixedly connected to the fixed plate, and the fixed plate is detachably connected to the punching head.

[0011] Preferably, the side wall of the fixed plate is fixedly connected to a fixed cylinder, and a buffer rod and a telescopic spring are provided inside the fixed cylinder. The buffer rod is arranged in an "I" shape, and one end of the buffer rod is slidingly connected to the inner wall of the fixed cylinder, and the two ends of the telescopic spring are respectively fixedly connected to the fixed plate and the side wall of the buffer rod.

[0012] Preferably, the tensioning assembly includes a support plate and a pressure plate, the two ends of the support plate are fixedly connected to the vertical frame, a limit rod is provided inside the vertical frame, the two ends of the limit rod are respectively fixedly connected to the side wall of the support plate and the inner wall of the vertical frame, the two ends of the pressure plate are respectively sleeved on the outer wall of the corresponding limit rod, and the pressure plate is respectively slidably connected to the limit rod and the vertical frame.

[0013] Preferably, a return spring is provided inside the vertical frame, and the return spring sleeve is provided on the outside of the limit rod. The two ends of the return spring are respectively fixedly connected to the side wall of the clamping plate and the inner wall of the vertical frame. The side of the clamping plate close to the support plate is fixedly connected with several protective strips distributed in an array.

[0014] Preferably, the tensioning assembly also includes an arc-shaped plate, one side of the arc-shaped plate is fixedly connected to a fixing rod, the end of the fixing rod away from the arc-shaped plate is fixedly connected to the clamping plate, the outer wall of the arc-shaped plate is provided with an extension plate, and the inner wall of the arc-shaped plate is rotatably connected to a plurality of array-distributed balls.

[0015] Preferably, one side of the support plate is fixedly connected to a movable plate, and the movable plate is sleeved on the outer wall of the slide rod. The movable plate is slidingly connected to the slide rod and the movable groove respectively, and one side of the movable plate is fixedly connected to one end of the corresponding buffer spring, and the end of the buffer spring away from the movable plate is fixedly connected to the inner wall of the movable groove.

[0016] The beneficial effects of the present invention are:

[0017] 1. During the processing, the detachable connection between the punch head and the fixed plate, as well as the action of the movable plate, slide rod and buffer spring, can make the ball on the inner side of the arc plate contact with the outer wall of the punch head. The rolling characteristics of the ball are used to reduce friction, ensuring that the arc plate can adaptively fit the outer wall of the punch head of different diameters. Under the action of the buffer spring, the arc plate drives the tensioning assembly to apply tension to the base paper through the contact between the ball and the outer wall of the punch head, avoiding the base paper from loosening or deflecting during the punching process, thereby ensuring the position accuracy of the punching and cutting and the quality of the cup bottom forming.

[0018] 2. During the downward movement of the punch head, the buffer rod will first contact the extension plate of the arc plate. At this time, the telescopic spring is in the initial compression state, and its elastic force acts on the surface of the arc plate through the buffer rod. The pressure is transmitted to the clamping plate through the fixed rod, pushing the clamping plate to slide along the limit rod to the side of the support plate, thereby stretching the reset spring. When the clamping plate and the support plate are in contact, the base paper between the two is clamped between the protective strip and the support plate to complete the tensioning and positioning of the paper tape, ensuring that the base paper remains flat during punching. After the clamping plate completes the tensioning action, the fixed plate continues to move downward. At this time, the buffer rod begins to slide in the fixed cylinder, compressing the internal telescopic spring, and finally realizing smooth cutting of the punch head. This step-by-step execution mechanism not only avoids the displacement of the base paper during punching, but also reduces the risk of damage to the base paper during processing while ensuring processing accuracy through the structural coordination of the rubber protective strip and the ball. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the overall front structure of an automatic bottom punching device for paper cups provided by an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the overall rear structure of an automatic bottom flushing device for paper cups provided by an embodiment of the present invention;

[0022] Figure 3 The invention provides an automatic bottom punching device for paper cups. Figure 2 A schematic diagram of the structure at center A;

[0023] Figure 4 This is a schematic structural diagram of a tensioning assembly of an automatic bottom punching device for paper cups provided by an embodiment of the present invention;

[0024] Figure 5 This is a schematic structural diagram of a punching assembly of an automatic bottom punching device for paper cups provided by an embodiment of the present invention;

[0025] Figure 6 The figure is a schematic diagram of the arc plate structure of an automatic bottom punching device for paper cups provided in an embodiment of the present invention.

[0026] In the figure: 1. Support frame; 2. Conveyor frame; 21. Movable slot; 22. Slide rod; 23. Buffer spring; 3. Winding roller; 4. Support plate; 5. Punching assembly; 51. Cylinder; 52. Fixed plate; 53. Fixed cylinder; 54. Buffer rod; 55. Telescopic spring; 6. Punching head; 7. Tensioning assembly; 71. Support plate; 72. Vertical frame; 73. Pressing plate; 731. Protective strip; 74. Arc plate; 741. Extension plate; 742. Fixed rod; 743. Ball; 75. Reset spring; 76. Limit rod; 77. Movable plate; 8. Paper release roller. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0028] Example 1

[0029] Reference Figures 1-6 A device for automatically punching the bottom of a paper cup comprises a support frame 1 and a conveying frame 2, wherein the conveying frame 2 is connected to a winding roller 3 and a paper discharge roller 8, and a support plate 4 and a punching head 6 are provided at the upper end of the conveying frame 2, and further comprises:

[0030] The punching assembly 5 is connected to the support plate 4 and is used for punching the base paper;

[0031] The tensioning assembly 7 is connected to the conveying frame 2 and is used for tensioning the paper.

[0032] The two ends of the pressing plate 73 are respectively sleeved on the outer wall of the corresponding limit rod 76, and the pressure plate 73 is respectively connected to the limit rod 76 and the vertical frame 72. The frame 72 is slidably connected; the tensioning assembly 7 also includes an arc plate 74, one side of the arc plate 74 is fixedly connected to a fixing rod 742, and the end of the fixing rod 742 away from the arc plate 74 is fixedly connected to the clamping plate 73, the outer wall of the arc plate 74 is provided with an extension plate 741, and the inner wall of the arc plate 74 is rotatably connected to a plurality of array-distributed balls 743; one side of the support plate 71 is fixedly connected to a movable plate 77, and the movable plate 77 is sleeved on the outer wall of the slide rod 22, and the movable plate 77 is slidably connected to the slide rod 22 and the movable groove 21 respectively, and one side of the movable plate 77 is fixedly connected to one end of the corresponding buffer spring 23, and the end of the buffer spring 23 away from the movable plate 77 is fixedly connected to the inner wall of the movable groove 21.

[0033] It should be noted that when processing paper cup base paper, the rolled raw material is first placed on the roller shaft of the paper placing roller 8. The base paper is gradually unfolded by the rotation of the paper placing roller 8. The other end of the unfolded base paper passes around the conveyor belt inside the conveyor frame 2 and is fixedly connected to the roller shaft of the winding roller 3. The rotation of the winding roller 3 forms a continuous traction tension on the base paper. At the same time, the conveyor belt motor inside the conveyor frame 2 is started to make the conveyor belt run at a constant speed, driving the smooth transportation of the cut cup bottom. When the base paper moves to the bottom of the punch head 6, the external controller controls the moving end of the cylinder 51 to move up and down periodically, thereby driving the punch head 6 to punch and cut the paper tape.

[0034] The cam 73 is pressed against the top of the workpiece 74 and the bottom of the workpiece 76 is pressed against the workpiece 77, and the cam 73 is pressed against the workpiece 77. The cam 73 is pressed against the workpiece 77 and the bottom of the workpiece 76 is pressed against the workpiece 77. The ball bearings 743 on the inner side of the curved plate 74 are in contact with the outer wall of the punch head 6, and the rolling characteristics of the ball bearings 743 are used to reduce friction, ensuring that the curved plate 74 can adaptively fit the outer wall of the punch head 6 of different diameters. In this process, the slide bar 22 provides a guide for the movable plate 77, and the elastic force of the buffer spring 23 enables the curved plate 74 to maintain the fitting pressure on the punch head 6, which not only ensures the stability of the movement of the curved plate 74, but also can adapt to the outer diameter of different types of punch heads 6 through the adaptive adjustment of the ball bearings 743. When the base paper is conveyed to the punching station, the arc plate 74, under the action of the buffer spring 23, drives the tensioning assembly 7 to apply tensioning force to the base paper through the contact between the ball 743 and the outer wall of the punch head 6. Specifically, the pressing plate 73 presses the support plate 71 downward under the action of the return spring 75, so that the base paper is clamped between the protective strip 731 of the pressing plate 73 and the support plate 71, preventing the base paper from loosening or deflecting during the punching process, thereby ensuring the position accuracy of the punching and cutting and the quality of the cup bottom forming.

[0035] Reference Figure 1 、 Figure 2 and Figure 5, further; the blanking assembly 5 includes a cylinder 51 and a fixed plate 52, the cylinder 51 is fixedly connected to the support plate 4, one end of the cylinder 51 passes through the side wall of the support plate 4 and is fixedly connected to the fixed plate 52, and the fixed plate 52 is detachably connected to the punching head 6; the side wall of the fixed plate 52 is fixedly connected with a fixed cylinder 53, and a buffer rod 54 and a telescopic spring 55 are provided inside the fixed cylinder 53, and the buffer rod 54 is arranged in an "I" shape, and one end of the buffer rod 54 is slidably connected to the inner wall of the fixed cylinder 53, and the two ends of the telescopic spring 55 are respectively fixedly connected to the fixed plate 52 and the side wall of the buffer rod 54; a return spring 75 is provided inside the vertical frame 72, and the return spring 75 is sleeved on the outside of the limit rod 76, and the two ends of the return spring 75 are respectively fixedly connected to the side wall of the pressing plate 73 and the inner wall of the vertical frame 72, and the pressing plate 73 is fixedly connected to a side close to the support plate 71 with several array-distributed protective strips 731.

[0036] When the locking cam 73 is in the state of being pressed down, the locking cam 73 is in the state of being pressed down, and the locking cam 73 is in the state of being pressed down, so the locking cam 73 is in the state of being pressed down. When the fibers of the base paper are broken or the surface is indented, the return spring 75 is in a stretched state, and its elastic force forms a balance with the pressure of the telescopic spring 55, completing the tensioning and positioning of the paper strip, ensuring that the base paper remains flat during punching. After the pressing plate 73 completes the tensioning action, the fixed plate 52 continues to move downward. At this time, the buffer rod 54 begins to slide in the fixed cylinder 53, compressing the internal telescopic spring 55. Due to the elastic buffering effect of the telescopic spring 55, the downward movement speed of the punch head 6 gradually slows down, forming a "fast first and slow later" movement rhythm: in the initial stage, it relies on the thrust of the cylinder 51 to quickly approach the base paper, and in the later stage, it contacts the paper surface smoothly through the damping effect of the telescopic spring 55, avoiding tearing of the base paper or damage to the cutting edge of the punch head 6 due to excessive impact. In addition, by setting the extension plate 741, it can be ensured that the arc plate 74 can cooperate with the squeezing of the buffer rod 54 in the mobile clamping of different types of punch heads 6 to smoothly achieve work;

[0037] During this process, the ball 743 on the inner side of the arc plate 74 maintains rolling contact with the outer wall of the punch head 6. The metal bearing of the ball 743 can withstand radial pressure, and at the same time, rolling friction is used instead of sliding friction. This design can not only ensure the following and guiding effect of the arc plate 74 on the punch head 6, but also avoid the wear caused by direct contact between the two. Especially when the punch head 6 moves up and down frequently, the maintenance cycle of the equipment can be significantly extended. Through the design of the elastic coefficient difference between the telescopic spring 55 and the reset spring 75, the device realizes the sequential action of first tensioning and then cutting. The tensioning component 7 first completes the positioning of the base paper, and then the elastic buffering of the buffer rod 54 realizes smooth cutting. This step-by-step execution mechanism not only avoids the displacement of the base paper during punching, but also reduces the risk of damage to the base paper during processing while ensuring processing accuracy through the structural coordination of the rubber protective strip 731 and the ball 743.

[0038] It should be noted that the specific model specifications need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0039] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A device for automatically punching the bottom of a paper cup, comprising a support frame (1) and a conveying frame (2), wherein the conveying frame (2) is connected to a winding roller (3) and a paper discharge roller (8), and a support plate (4) and a punching head (6) are provided at the upper end of the conveying frame (2), characterized in that: Also includes: A punching assembly (5), the punching assembly (5) being connected to the support plate (4), and the punching assembly (5) being used for punching the base paper; A tensioning assembly (7), wherein the tensioning assembly (7) is connected to the conveying frame (2), and the tensioning assembly (7) is used for tensioning paper.

2. The automatic bottom punching device for paper cups according to claim 1, characterized in that: The conveying frame (2) is fixedly connected to the upper end of the support frame (1); a movable groove (21) is provided on the upper side wall of the conveying frame (2); a slide bar (22) is fixedly connected to the inner wall of the movable groove (21); buffer springs (23) are sleeved on both ends of the slide bar (22); the conveying frame (2) is fixedly connected to the support plate (4); and the support plate (4) is located in the middle position between the winding roller (3) and the paper placing roller (8).

3. The automatic bottom punching device for paper cups according to claim 1, characterized in that: The punching assembly (5) comprises a cylinder (51) and a fixed plate (52); the cylinder (51) is fixedly connected to the support plate (4); one end of the cylinder (51) passes through the side wall of the support plate (4) and is fixedly connected to the fixed plate (52); and the fixed plate (52) is detachably connected to the punch head (6).

4. The automatic bottom punching device for paper cups according to claim 3, characterized in that: The side wall of the fixed plate (52) is fixedly connected to a fixed cylinder (53), and a buffer rod (54) and a telescopic spring (55) are provided inside the fixed cylinder (53). The buffer rod (54) is arranged in an "I" shape, and one end of the buffer rod (54) is slidably connected to the inner wall of the fixed cylinder (53). The two ends of the telescopic spring (55) are respectively fixedly connected to the side wall of the fixed plate (52) and the buffer rod (54).

5. The automatic bottom punching device for paper cups according to claim 2, characterized in that: The tensioning assembly (7) includes a supporting plate (71) and a pressing plate (73), the two ends of the supporting plate (71) are fixedly connected to the vertical frame (72), a limiting rod (76) is provided inside the vertical frame (72), the two ends of the limiting rod (76) are respectively fixedly connected to the side wall of the supporting plate (71) and the inner wall of the vertical frame (72), the two ends of the pressing plate (73) are respectively sleeved on the outer wall of the corresponding limiting rod (76), and the pressing plate (73) is respectively slidably connected to the limiting rod (76) and the vertical frame (72).

6. The automatic bottom punching device for paper cups according to claim 5, characterized in that: A return spring (75) is provided inside the vertical frame (72), and the return spring (75) is sleeved on the outside of the limit rod (76). The two ends of the return spring (75) are respectively fixedly connected to the side wall of the clamping plate (73) and the inner wall of the vertical frame (72). A plurality of array-distributed protective strips (731) are fixedly connected to the side of the clamping plate (73) close to the supporting plate (71).

7. The automatic bottom punching device for paper cups according to claim 5, characterized in that: The tensioning assembly (7) further comprises an arc-shaped plate (74), one side of the arc-shaped plate (74) is fixedly connected to a fixing rod (742), one end of the fixing rod (742) away from the arc-shaped plate (74) is fixedly connected to a clamping plate (73), an outer side wall of the arc-shaped plate (74) is provided with an extension plate (741), and an inner side wall of the arc-shaped plate (74) is rotatably connected to a plurality of array-distributed balls (743).

8. The automatic bottom punching device for paper cups according to claim 5, characterized in that: A movable plate (77) is fixedly connected to one side of the support plate (71), and the movable plate (77) is sleeved on the outer wall of the slide rod (22). The movable plate (77) is slidably connected to the slide rod (22) and the movable groove (21) respectively. One side of the movable plate (77) is fixedly connected to one end of a corresponding buffer spring (23), and the end of the buffer spring (23) away from the movable plate (77) is fixedly connected to the inner wall of the movable groove (21).

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