Leaf holding mechanism and leaf holding device

Abstract

The present application relates to a leaf-holding mechanism and leaf-holding equipment. The leaf-holding mechanism includes a mounting frame, a paper cup mold, a pair of blades and a pair of servo drive devices. The paper cup mold is fixedly connected to the mounting frame, and two blades are symmetrically arranged on both sides of the paper cup mold. The blades are swingably connected to the mounting frame, and the rotating shaft of the blades is located below the paper cup mold to form a gap for inserting paper sheets. The servo drive device includes a transmission member rotatably connected to the blades, a crank rotatably connected to the transmission member, and a servo motor installed on the mounting frame. The servo motor drive is connected to the crank so that the transmission member drives the blades to swing. The present application uses multiple servo motors to drive the blades to swing, and the rhythm is controllable and the precision is high. Since the driving cam in the traditional technology is eliminated, the transmission assembly is simplified and the transmission efficiency is improved, which is conducive to improving the operating speed of the leaf-holding equipment and even the paper cup production equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of paper cup production, in particular to a leaf holding mechanism and leaf holding equipment. Background Art

[0002] In the automated production of paper cups, the fan-shaped paper sheet needs to be rolled into a preset cylindrical shape through a leaf-holding mechanism. Specifically, at least a paper cup mold of a preset shape, two leaves and a welding mechanism are required. The fan-shaped paper sheet is placed between the paper cup mold and the two leaves. The two leaves rotate around the paper cup mold driven by a driving device and fit the paper sheet to the paper cup mold and press it tightly. The welding mechanism located above welds and fixes the overlapping parts of the paper sheet to form a cylindrical paper cup semi-finished product.

[0003] The existing driving device of the leaf holding mechanism adopts a combination structure of multiple cams and multiple transmission rods that are coaxial and have track grooves. This driving device occupies a large space and needs to be used with lubricating fluid to reduce the sliding friction between the transmission rod and the track groove in actual use. When the rotation speed of the rotating shaft is too fast and the lubricating fluid is insufficient, the cam and the transmission rod are easily stuck. Therefore, due to the limitation of the operating speed of the leaf holding mechanism, it is difficult to speed up the paper cup production equipment and the paper cup production capacity is limited. Utility Model Content

[0004] In view of the shortcomings of the existing leaf holding mechanism that it occupies a large space and is prone to jamming, resulting in low paper cup production efficiency, it is necessary to provide a leaf holding mechanism and a leaf holding device.

[0005] A leaf holding mechanism, comprising:

[0006] Mounting frame;

[0007] A paper cup mold, the paper cup mold is fixedly connected to the mounting frame;

[0008] a pair of blades, the two blades being symmetrically arranged on both sides of the paper cup mold, and the blades being swingably connected to the mounting frame; and

[0009] A pair of servo drive devices, the servo drive device includes a transmission member rotatably connected to the blade, a crank rotatably connected to the transmission member and a servo motor installed on the mounting frame, the servo motor is driven and connected to the crank so that the transmission member drives the blade to swing.

[0010] With this arrangement, multiple servo motors are used to drive the blades to swing, with a controllable rhythm and high precision. Since the driving cam in traditional technology is eliminated, the transmission components are simplified and the transmission efficiency is improved, which is beneficial to improving the operating speed of the leaf holding equipment and even the paper cup production equipment.

[0011] In one embodiment, the transmission member includes a first connecting part, a second connecting part slidably connected to the first connecting part, and a buffer part whose two ends are respectively connected to the first connecting part and the second connecting part, the first connecting part is rotatably connected to the blade, and the second connecting part is rotatably connected to the crank.

[0012] With such an arrangement, the buffer part can eliminate the influence of the installation error of the servo motor on the leaf-holding action, and can also avoid the problem of the servo motor's life being reduced due to repeated starting and stopping within a complete leaf-holding action.

[0013] In one embodiment, the first connecting portion has a mounting cavity and an opening connected to the mounting cavity, the buffer portion is a buffer spring and is accommodated in the mounting cavity, and the second connecting portion is inserted into the opening and abuts against the buffer spring.

[0014] With such arrangement, the buffer spring is located in the installation cavity and will not be disturbed by external factors, and the second connection part is tightly plugged into the first connection part and slides smoothly.

[0015] In one embodiment, the first connecting portion includes a first connecting rod rotatably connected to the blade, a mounting tube having the mounting cavity, and a first adjusting bolt with two ends respectively screwed to the first connecting rod and the mounting tube.

[0016] With such an arrangement, the length of the first connecting portion can be adjusted without adjusting the position of the servo motor, thereby adjusting the rotation angle of the blade, and further adjusting the time when the blade abuts against the paper cup mold.

[0017] In one embodiment, the cross section of the first adjusting bolt is a polygon.

[0018] This setting makes it convenient for engineers to make instant adjustments directly through a wrench, and the operation is simple.

[0019] In one embodiment, the second connection portion has a plug connector and a stop block radially extending from an outer peripheral wall of the plug connector, and the buffer spring is sleeved on the plug connector and abuts against the stop block.

[0020] With such arrangement, the buffer spring is limited by the plug connector and is not easy to fall out.

[0021] In one of the embodiments, the first connecting portion further includes a limiting block located at the opening, and the stopping block is located at a side of the limiting block facing the installation cavity.

[0022] In this configuration, the limiting block blocks the stop block along the sliding direction of the second connecting part, thereby preventing the second connecting part from being accidentally separated from the first connecting rod.

[0023] In one embodiment, the second connecting portion includes a second adjusting bolt, a bearing seat screwed to one end of the second adjusting bolt, and a bearing mounted on the bearing seat, and the bearing is fixedly connected to the crank.

[0024] Such an arrangement can not only flexibly adjust the length of the transmission member, but also facilitate the replacement of the bearing seat, the bearing and the second adjusting bolt without replacing the entire second connecting part, thereby reducing maintenance costs.

[0025] In one embodiment, the leaf holding mechanism also includes a positioning assembly, which includes a support frame located below the paper cup mold and fixedly connected to the mounting frame, a pressure rod slidably mounted on the support frame, and a positioning drive member fixedly connected to the mounting frame, wherein the positioning drive member is drivingly connected to the pressure rod so that the pressure rod abuts against the paper cup mold.

[0026] With such arrangement, the paper sheet can be positioned by pressing the paper sheet against the paper cup mold through the pressing rod of the positioning assembly, which is helpful to reduce the shaking of the paper sheet and ensure the quality of the paper sheet forming.

[0027] The present application also provides a leaf-holding device, including a welding mechanism and a leaf-holding mechanism as described above, wherein the welding mechanism is located above the paper cup mold of the leaf-holding mechanism and is used to weld two ends of a paper sheet.

[0028] With such arrangement, the welding mechanism in combination with the leaf holding mechanism provided in the present application can significantly improve the production efficiency of paper cups and increase the production capacity of the paper cup automated production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a leaf-holding device in an embodiment provided in the present application;

[0030] Figure 2 for Figure 1 A front view of the leaf holding device;

[0031] Figure 3 for Figure 2 Schematic diagram of the structure of the transmission parts;

[0032] Figure 4 for Figure 3 A cross-sectional view of the transmission member shown.

[0033] Reference numerals:

[0034] 10. Mounting frame; 11. First frame; 12. Second frame; 13. Third frame; 20. Paper cup mold; 30. Blade; 40. Servo drive device; 41. Transmission member; 411. First connecting part; 4111. First connecting rod; 4112. Mounting tube; 4113. First adjusting bolt; 4114. Limit block; 412. Second connecting part; 4121. Plug connector; 4122. Stop block; 4123. Second adjusting bolt; 4124. Bearing seat; 4125. Bearing; 413. Buffer; 42. Crank; 43. Servo motor; 50. Positioning assembly; 51. Support frame; 52. Pressure rod; 53. Positioning drive member; 60. Welding mechanism; 61. Ironing knife; 62. Ironing knife drive member. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0041] In the automated production of paper cups, the fan-shaped paper sheet needs to be rolled into a preset cylindrical shape by a leaf holding mechanism. Specifically, at least a paper cup mold 20 of a preset shape, two leaves 30 and a welding mechanism 60 are required. The fan-shaped paper sheet is placed between the paper cup mold 20 and the two leaves 30. The two leaves 30 rotate around the paper cup mold 20 under the drive of the driving device and adhere the paper sheet to the paper cup mold 20 and press it tightly. The welding mechanism 60 located above welds and fixes the overlapping parts of the paper sheet to form a cylindrical semi-finished paper cup.

[0042] The existing driving device of the leaf holding mechanism adopts a combination structure of multiple cams and multiple transmission rods that are coaxial and have track grooves. This driving device occupies a large space and needs to be used with lubricating fluid to reduce the sliding friction between the transmission rod and the track groove in actual use. When the rotation speed of the rotating shaft is too fast and the lubricating fluid is insufficient, the cam and the transmission rod are easily stuck. Therefore, due to the limitation of the operating speed of the leaf holding mechanism, it is difficult to speed up the paper cup production equipment and the paper cup production capacity is limited.

[0043] Based on this, it is necessary to provide a leaf holding mechanism and leaf holding equipment that can improve the production efficiency of paper cup production equipment.

[0044] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of the structure of a leaf holding device provided in this application. Figure 2 for Figure 1 Front view of the leaf holding device. The present application provides a leaf holding device including a welding mechanism 60 and a leaf holding mechanism. The leaf holding mechanism includes a mounting frame 10, a paper cup mold 20, a pair of blades 30 and a pair of servo drive devices 40. The mounting frame 10 includes a first frame 11, a second frame 12 and a third frame. The paper cup mold 20 is fixedly connected to the first frame 11 of the mounting frame 10. The welding mechanism 60 is fixedly connected to the second frame 12 of the mounting frame 10. The two blades 30 are symmetrically arranged on both sides of the paper cup mold 20. The blades 30 are swingably connected to the first frame 11. The rotation axis of the blades 30 is located below the paper cup mold 20 to form a gap for inserting paper sheets; the servo drive device 40 includes a transmission member 41 rotatably connected to the blade 30, a crank 42 rotatably connected to the transmission member 41 and a servo motor 43 installed on the third frame 13 of the mounting frame 10. The servo motor 43 is driven and connected to the crank 42 so that the transmission member 41 drives the blade 30 to swing. The welding mechanism 60 includes a hot knife 61 slidably mounted on the second frame 12, and a hot knife driving member 62 fixedly connected to the second frame 12, and the hot knife driving member 62 is drivingly connected to the hot knife 61 and is used to drive the hot knife 61 to move back and forth vertically. The present application uses multiple servo motors 43 to drive the blades 30 to swing, and the rhythm is controllable and the precision is high. Since the driving cam in the traditional technology is eliminated, the transmission components are simplified and the transmission efficiency is improved, which is conducive to improving the operation speed of the leaf holding equipment and even the paper cup production equipment.

[0045] Optionally, in an embodiment provided in the present application, the welding mechanism 60 is also driven by a servo motor 43, which makes it convenient to adjust the welding time of the welding mechanism 60 according to different types of paper sheets, and facilitates engineers to perform repeated debugging to test the shortest time required for welding different types of paper sheets.

[0046] Since the servo motor has high requirements for the installation position accuracy, if the installation position of the servo motor deviates, for example, the servo motor is too far from the blade, it is easy to cause the blade to rotate too much, further resulting in poor quality of paper cup molding. For example, if the servo motor is too close to the blade, it is easy to cause the blade to rotate too much. When the blade contacts the paper cup mold, the servo motor cannot continue to rotate in the same direction and can only switch the rotation direction, which can easily reduce the service life of the servo motor. In addition, the leaf holding mechanism needs to reserve welding time for the welding mechanism, so the servo motor needs to be started and stopped repeatedly during a complete leaf holding action cycle, which can easily damage the life of the servo motor.

[0047] Based on this, see Figure 3 and Figure 4 , Figure 3 for Figure 2 The schematic diagram of the structure of the middle transmission member 41, Figure 4 for Figure 3 A cross-sectional view of the transmission member 41 is shown. In order to solve the problems of the low service life and difficult installation of the servo motor 43, in an embodiment provided in the present application, the transmission member 41 includes a first connection portion 411, a second connection portion 412 slidably connected to the first connection portion 411, and a buffer portion 413 whose two ends are respectively connected to the first connection portion 411 and the second connection portion 412, the first connection portion 411 is rotatably connected to the blade 30, and the second connection portion 412 is rotatably connected to the crank 42. On the one hand, due to the presence of the buffer portion 413, the installation position of the servo motor 43 is not limited to a specific position, but can be adjusted within a certain area, and the installation error is absorbed by the buffer portion 413, as long as the blade 30 is in contact with the paper cup mold 20, the buffer portion 413 can continue to be compressed. On the other hand, when the buffer portion 413 is in a compressed state, the blade 30 remains in contact with the paper cup mold 20, which reserves welding time for the welding mechanism 60. During this period, the servo motor 43 can still keep rotating, that is, there is no need to stop and wait. Therefore, the servo motor 43 can rotate a full circle within one leaf holding action cycle without being interrupted, thereby extending the service life of the servo motor 43.

[0048] For details, please refer to Figure 4 The first connection part 411 has a mounting cavity and an opening connected to the mounting cavity, the buffer part 413 is a buffer spring and is accommodated in the mounting cavity, and the second connection part 412 is inserted in the opening and abuts against the buffer spring. In this way, the buffer spring is located in the mounting cavity and will not be disturbed by external factors, and the second connection part 412 and the first connection part 411 are tightly plugged and slide smoothly.

[0049] Furthermore, in an embodiment provided in the present application, for the convenience of debugging, the first connecting portion 411 includes a first connecting rod 4111 rotatably connected to the blade 30, a mounting tube 4112 having a mounting cavity, and a first adjusting bolt 4113 having two ends respectively screwed to the first connecting rod 4111 and the mounting tube 4112. In this way, the length of the first connecting portion 411 can be adjusted without adjusting the position of the servo motor 43, thereby adjusting the rotation angle of the blade 30, and further adjusting the time when the blade 30 abuts against the paper cup mold 20.

[0050] Furthermore, in an embodiment provided in the present application, the cross section of the first adjusting bolt 4113 is a polygon, which facilitates engineers to make instant adjustments directly through a wrench, and is easy to operate.

[0051] Specifically, in one embodiment provided in the present application, the second connection portion 412 has a plug connector 4121 and a stopper 4122 radially extending from the outer peripheral wall of the plug connector 4121, and the buffer spring is sleeved on the plug connector 4121 and abuts against the stopper 4122, so that the buffer spring is limited by the plug connector 4121 and is not easy to fall out. Specifically, the stopper 4122 is arranged around the outer peripheral wall of the plug connector 4121.

[0052] Furthermore, in an embodiment provided in the present application, the first connection portion 411 further includes a limit block 4114 located at the opening, and the stop block 4122 is located on the side of the limit block 4114 facing the installation cavity. In this way, the limit block 4114 blocks the stop block 4122 along the sliding direction of the second connection portion 412, thereby preventing the second connection portion 412 from being accidentally separated from the first connection rod 4111.

[0053] Further, in an embodiment provided by the present application, the second connecting portion 412 includes a second adjusting bolt 4123, a bearing seat 4124 screwed to one end of the second adjusting bolt 4123, and a bearing 4125 mounted on the bearing seat 4124, and the bearing 4125 is fixedly connected to the crank 42. In this way, the length of the transmission member 41 can be flexibly adjusted, and the bearing seat 4124, the bearing 4125 and the second adjusting bolt 4123 can be easily replaced without replacing the entire second connecting portion 412, thereby reducing maintenance costs.

[0054] Furthermore, in an embodiment provided in the present application, the leaf holding mechanism further includes a positioning assembly 50, which includes a support frame 51 located below the paper cup mold 20 and fixedly connected to the first frame 11, a pressing rod 52 slidably mounted on the support frame 51, and a positioning drive 53 fixedly connected to the third frame 13, wherein the positioning drive 53 is driven and connected to the pressing rod 52 so that the pressing rod 52 abuts against the paper cup mold 20. In this way, when a paper sheet is inserted between the paper cup mold 20 and the two leaves 30, the pressing rod 52 of the positioning assembly 50 can press the paper sheet against the paper cup mold 20 to achieve paper sheet positioning, which is conducive to reducing the shaking of the paper sheet and ensuring the quality of paper sheet forming.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A leaf holding mechanism, characterized in that: include: Mounting frame (10); A paper cup mold (20), the paper cup mold (20) being fixedly connected to the mounting frame (10); a pair of blades (30), the two blades (30) being symmetrically arranged on both sides of the paper cup mold (20), and the blades (30) being swingably connected to the mounting frame (10); and A pair of servo drive devices (40), the servo drive devices (40) comprising a transmission member (41) rotatably connected to the blade (30), a crank (42) rotatably connected to the transmission member (41), and a servo motor (43) mounted on the mounting frame (10), the servo motor (43) drivingly connected to the crank (42) so that the transmission member (41) drives the blade (30) to swing.

2. A leaf holding mechanism according to claim 1, characterized in that: The transmission member (41) comprises a first connection portion (411), a second connection portion (412) slidably connected to the first connection portion (411), and a buffer portion (413) having two ends respectively connected to the first connection portion (411) and the second connection portion (412); the first connection portion (411) is rotatably connected to the blade (30), and the second connection portion (412) is rotatably connected to the crank (42).

3. A leaf holding mechanism according to claim 2, characterized in that: The first connecting portion (411) has a mounting cavity and an opening connected to the mounting cavity, the buffer portion (413) is a buffer spring and is accommodated in the mounting cavity, and the second connecting portion (412) is inserted into the opening and abuts against the buffer spring.

4. A leaf holding mechanism according to claim 3, characterized in that: The first connecting portion (411) comprises a first connecting rod (4111) rotatably connected to the blade (30), a mounting tube (4112) having the mounting cavity, and a first adjusting bolt (4113) having two ends respectively screwed to the first connecting rod (4111) and the mounting tube (4112).

5. A leaf holding mechanism according to claim 4, characterized in that: The cross section of the first adjusting bolt (4113) is polygonal.

6. A leaf holding mechanism according to claim 4, characterized in that: The second connecting portion (412) comprises a plug connector (4121) and a stop block (4122) radially extending from the outer peripheral wall of the plug connector (4121), and the buffer spring is sleeved on the plug connector (4121) and abuts against the stop block (4122).

7. A leaf holding mechanism according to claim 6, characterized in that: The first connecting portion (411) further comprises a limiting block (4114) located at the opening, and the stopping block (4122) is located at a side of the limiting block (4114) facing the installation cavity.

8. The leaf holding mechanism according to claim 2, characterized in that: The second connecting portion (412) includes a second adjusting bolt (4123), a bearing seat (4124) screwed to one end of the second adjusting bolt (4123), and a bearing (4125) installed on the bearing seat (4124), and the bearing (4125) is fixedly connected to the crank (42).

9. The leaf holding mechanism according to claim 1, characterized in that: The leaf holding mechanism further comprises a positioning assembly (50), the positioning assembly (50) comprising a support frame (51) located below the paper cup mold (20) and fixedly connected to the mounting frame (10), a pressure rod (52) slidably mounted on the support frame (51), and a positioning driving member (53) fixedly connected to the mounting frame (10), the positioning driving member (53) being drivingly connected to the pressure rod (52) so that the pressure rod (52) abuts against the paper cup mold (20).

10. A leaf holding device, characterized in that: It comprises a welding mechanism (60) and a leaf holding mechanism as claimed in any one of claims 1 to 9, wherein the welding mechanism (60) is located above the paper cup mold (20) of the leaf holding mechanism and is used for welding two ends of a paper sheet.

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