Heat sealing transmission mechanism for stabilizing and keeping materials during heat sealing

Abstract

The utility model relates to the field of packaging machinery, and discloses a heat-sealing transmission mechanism for stabilizing and keeping materials during heat-sealing, which comprises front and rear sealing heads for sealing a packaging bag, the sealing heads on the two sides are closed to perform heat-sealing on the materials between the sealing heads, and the sealing head on at least one side is connected with a power source I through a keeping transmission mechanism. The retaining transmission mechanism comprises a connecting transmission arm and a retaining transmission arm, one end of the connecting transmission arm is hinged to the end socket, the other end of the connecting transmission arm is hinged to the retaining transmission arm through a rotating shaft, and the output end of the first power source is connected with the rotating shaft. The included angle alpha between the connecting transmission arm and the retaining transmission arm is gradually increased, and the included angle alpha between the connecting transmission arm and the retaining transmission arm reaches the maximum value close to or equal to 180 degrees during heat sealing, so that the retaining transmission arm abuts against the connecting transmission arm. When heat sealing is completed, the included angle of the two arms forms an approximately linear rigid structure, the seal head is prevented from retreating through mechanical self-locking, the seal head is kept in the original position, and the sealing effect is better.

Description

Technical Field

[0001] The utility model relates to the field of packaging machinery, in particular to a heat-sealing transmission mechanism that plays a role in stably holding materials during heat-sealing. Background Art

[0002] In the prior art, the heat-sealing mechanism usually adopts a linear drive mode in which the two side sealing heads move towards each other (such as directly pushing and pulling by a cylinder). However, this design has the following defects: backflush problem: when the two side sealing heads quickly move towards each other, due to inertia or material resistance, one of the sealing heads is prone to retreat, resulting in insufficient heat-sealing pressure or unqualified heat-sealing time, and generating defective products. Cylinder load concentration: in the traditional linear drive mode, the power source (such as a cylinder) directly bears the reaction force of the movement of the sealing head, and long-term operation is prone to cause cylinder wear and reduced service life. Insufficient stability: a simple linear transmission structure cannot provide rigid support at the critical position of heat-sealing, and the sealing head is prone to produce a small backward displacement due to external interference.

[0003] Therefore, there is an urgent need for a heat-sealing transmission mechanism that realizes stable holding of the sealing head, disperses stress, and prolongs the service life of the equipment through mechanical structure optimization, so as to solve the problem of poor sealing quality. Summary of the Utility Model

[0004] The utility model aims at the defects in the prior art and provides a heat-sealing transmission mechanism that plays a role in stably holding materials during heat-sealing, which is especially suitable for scenarios of preventing the sealing head from backflushing and improving heat-sealing stability in high-speed packaging equipment.

[0005] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0006] A heat-sealing transmission mechanism that plays a role in stably holding materials during heat-sealing includes sealing heads that seal the packaging bag on the front and back sides. The two side sealing heads close together to heat-seal the materials between them. Among them, at least one side of the sealing head is connected to a power source I through a holding transmission mechanism. The holding transmission mechanism includes a connecting transmission arm and a holding transmission arm. One end of the connecting transmission arm is hinged to the sealing head, and the other end of the connecting transmission arm is hinged to the holding transmission arm through a rotating shaft. The output end of the power source I is connected to the rotating shaft at one end of the holding transmission arm or to the other end of the holding transmission arm. When the power source I drives the sealing head during the sealing movement, the included angle between the connecting transmission arm and the holding transmission arm gradually increases. During heat-sealing, the included angle α between the two reaches a maximum value close to or equal to 180° so that the holding transmission arm abuts against the connecting transmission arm. When the heat-sealing is completed, the included angle α between the two arms approaches 180°, forming an approximate linear rigid structure, and the backward force is offset through mechanical self-locking, avoiding the direct force on the power source.

[0007] Preferably, the end of the holding transmission arm far from the rotating shaft is rotatably installed on the mounting plate.

[0008] Preferably, the holding transmission mechanism further includes a guide rail, which is fixedly connected to the mounting plate, and the head is slidably arranged on the guide rail through a slider, so as to ensure the stable movement track of the head.

[0009] Preferably, the first power source is a cylinder or a motor, and a swing rod is connected to the output end of the first power source. The swing rod is sleeved on the rotating shaft or connected to the other end of the holding transmission arm.

[0010] Preferably, the first power source is a motor or a cylinder, and a cam is connected to the output end of the first power source. One end of the cam is mounted on the rotating shaft or connected to the other end of the holding transmission arm.

[0011] Preferably, the power output direction of the first power source is not parallel to the straight line where the connecting transmission arm is located, and there is an included angle β between them.

[0012] Preferably, β is not 90°, 0°, or 180°. The non-parallel included angle β design decomposes the cylinder thrust into an axial driving force and a radial supporting force, reduces the friction loss between the guide rail and the slider, and at the same time provides the power for the change of the included angle between the connecting transmission arm and the holding transmission arm.

[0013] Preferably, the head on one side is connected to the first power source through the holding transmission mechanism, and the head on the other side is connected to a second power source whose output direction is parallel to the movement direction of the head.

[0014] Preferably, the heads on both sides are connected to the first power source through the holding transmission mechanism.

[0015] Due to the adoption of the above technical solutions, the utility model has remarkable technical effects:

[0016] The connecting transmission arm and the holding transmission arm form a mechanical self-locking structure during sealing, avoiding the head from retracting, enabling the heat sealing time to meet the standard, being beneficial to improving the product qualification rate, enhancing stability, and achieving stable control through a pure mechanical structure; the equipment life is extended: the stress is dispersed to the fixed components through the transmission arm, reducing the load of the first power source and making it not easily damaged. Brief Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the utility model;

[0018] Figure 2 is a schematic structural diagram of the utility model from another angle;

[0019] Figure 3 is a schematic structural diagram of the holding transmission mechanism;

[0020] Figure 4 is a schematic structural diagram of the connection of the connecting transmission arm, the holding transmission arm, and the crankshaft.

[0021] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. Head; 2. Retaining transmission mechanism; 21. Connecting transmission arm; 22. Retaining transmission arm; 23. Rotating shaft; 3. Power source one; 31. Rocker arm; 41. Mounting plate; 42. Guide rail; 43. Slider; 5. Power source two. DETAILED DESCRIPTION

[0022] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0023] Example 1

[0024] Heat sealing transmission mechanism that stabilizes the material during heat sealing, such as Figure 1-2 , including a head 1 for sealing the packaging bag on the front and back sides, the head 1 on both sides are closed to heat-seal the material between the two, and the head can be closed in a manner where one side moves and the other side does not move or both sides of the head move, wherein at least one side of the head 1 is connected to a power source 3 through a retaining transmission mechanism 2, the retaining transmission mechanism 2 includes a connecting transmission arm 21 and a retaining transmission arm 22, one end of the connecting transmission arm 21 is hinged to the head 1, and the other end of the connecting transmission arm 21 is hinged to the retaining transmission arm 22 through a rotating shaft 23, the output end of the power source 3 is connected to the rotating shaft 23 at one end of the retaining transmission arm 22 or is connected to the other end of the retaining transmission arm 22, and this embodiment takes the output end of the power source 3 being connected to the rotating shaft 23 as an example. (If the other end of the transmission arm 22 is connected, the transmission arm 22 and the power source 3 drive the transmission arm 22 located at one end of the rotating shaft 23 to move, thereby driving the connecting transmission arm 21.) When the power source 3 drives the sealing head 1 to move in sealing, the angle between the connecting transmission arm 21 and the holding transmission arm 22 gradually increases. During heat sealing, the angle α between the two reaches a maximum value close to or equal to 180°, so that the holding transmission arm 22 presses against the connecting transmission arm 21. When the heat sealing starts, the power source 3 pushes the swing rod 31, so that the angle α between the connecting transmission arm 21 and the holding transmission arm 22 gradually increases from the initial 90°. When the two arms are close to 180°, the holding transmission arm 22 presses against the connecting transmission arm 21, forming a self-locking, and the sealing head 1 completes stable pressing along the guide rail 42 through the slider 43.

[0025] The transmission arm 22 is kept rotatably mounted on the mounting plate 41 at one end away from the rotating shaft 23 .

[0026] like Figure 3 As shown, the holding transmission mechanism 2 further includes a guide rail 42 , which is fixedly connected to the mounting plate 41 , and the sealing head 1 is slidably disposed on the guide rail 42 via a slider 43 .

[0027] As one of the conventional power source options, the power source 1 3 is a cylinder or a motor, and the output end of the power source 1 is connected to a swing rod 31 , which is sleeved and installed on the rotating shaft 23 .

[0028] As Figure 4 shown, the power output direction of the first power source 3 is not parallel to the straight line where the connecting transmission arm 21 is located, and there is an included angle β between them. β is not 90°, 0°, or 180°. If β is an obtuse angle, when heat-sealing, the first power source pushes the connecting transmission arm, and when returning to the original position, it pulls back the connecting transmission arm. If β is an acute angle, when heat-sealing, the first power source pulls back the connecting transmission arm, and when returning to the original position, it pushes the connecting transmission arm. When the first power source 3 drives the swing rod 31 by using a cylinder, the output direction forms a non-orthogonal and non-parallel included angle β with the connecting transmission arm 21, preferably 45° - 75°, and the stress is dispersed through the lever effect.

[0029] Working principle

[0030] 1. Power transmission stage:

[0031] The first power source 3 is a motor or a cylinder. The first power source 3 drives the rotating shaft 23 through various transmission means. One way is through the swing rod 31, and the swing rod 31 is installed on the rotating shaft 23 or connected to the other end of the holding transmission arm 22. Another way is through a cam (not shown in the figure), and one end of the cam is installed on the rotating shaft 23 or connected to the other end of the holding transmission arm 22. It can also be that a motor or a cylinder drives through transmission parts such as gears, pulley guides, connecting rods, synchronous belt pulleys or a combination of multiple transmission parts, or other connection methods can be used to achieve transmission. The horizontal component force drives the connecting transmission arm 21 to push the sealing head 1 to move towards the material direction. At this time, the included angle α is relatively small, such as 120°, and the power transmission efficiency is high.

[0032] 2. Self-locking and stable stage diagram:

[0033] When α approaches 180°, the two arms form an approximate straight-line structure. At this time, the first power source 3 stops operating. Since there is the holding transmission arm supporting the connecting transmission arm 21 on the other side, the connecting transmission arm 21 will not have horizontal movement. This recoil force will be transmitted to the mounting plate 41 through the holding transmission arm 22, avoiding the recoil force acting on the first power source 3.

[0034] According to the layout requirements of different packaging machines, the holding mechanism can be configured on one side or both sides. If it is set on one side, one of the sealing heads 1 is connected to the first power source 3 through the holding transmission mechanism 2, and the other sealing head 1 is connected to the second power source 5 whose output direction is parallel to the movement direction of the sealing head 1. If it is set on both sides, both sealing heads 1 on both sides are connected to the first power source 3 through the holding transmission mechanism 2, which can make the effect better. The second power source 5 is a power driving device that directly drives the sealing head 1 by a cylinder or a motor or through transmission parts such as connecting rods and cams.

[0035] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0036] In summary, the above are only the preferred embodiments of the present utility model, and all equivalent changes and modifications made according to the scope of the patent application of the present utility model shall fall within the scope covered by the patent of the present utility model.

Claims

1. A heat-sealing transmission mechanism for stabilizing and maintaining materials during heat sealing, comprising sealing heads (1) for sealing the packaging bag on both sides, the sealing heads (1) on both sides closing together to heat-seal the materials therebetween, characterized in that: in, At least one side of the sealing head (1) is connected to a power source (3) via a retaining transmission mechanism (2); the retaining transmission mechanism (2) comprises a connecting transmission arm (21) and a retaining transmission arm (22); one end of the connecting transmission arm (21) is hinged to the sealing head (1); the other end of the connecting transmission arm (21) is hinged to the retaining transmission arm (22) via a rotating shaft (23); the output end of the power source (3) is connected to the rotating shaft (23) at one end of the retaining transmission arm (22) or to the other end of the retaining transmission arm (22); when the power source (3) drives the sealing head (1) to perform a sealing movement, the angle between the connecting transmission arm (21) and the retaining transmission arm (22) gradually increases; during heat sealing, the angle α between the two reaches a maximum value close to or equal to 180° so that the retaining transmission arm (22) presses against the connecting transmission arm (21).

2. The heat sealing transmission mechanism for stabilizing the material during heat sealing according to claim 1, characterized in that: The transmission arm (22) is kept away from one end of the rotation shaft (23) and is rotatably mounted on the mounting plate (41).

3. The heat sealing transmission mechanism for stabilizing the material during heat sealing according to claim 2, characterized in that: The holding transmission mechanism (2) further comprises a guide rail (42), the guide rail (42) being fixedly connected to the mounting plate (41), and the sealing head (1) being slidably arranged on the guide rail (42) via a sliding block (43).

4. The heat-sealing transmission mechanism for stabilizing the material during heat sealing according to claim 1, characterized in that: The power source one (3) is a cylinder or a motor. The output end of the power source one (3) is connected to a swing rod (31). The swing rod (31) is sleeved and mounted on the rotating shaft (23) or connected to the other end of the holding transmission arm (22).

5. The heat sealing transmission mechanism for stabilizing the material during heat sealing according to claim 1, characterized in that: The power source one (3) is a motor or a cylinder. The output end of the power source one (3) is connected to a cam. One end of the cam is mounted on the rotating shaft (23) or connected to the other end of the holding transmission arm (22).

6. The heat-sealing transmission mechanism for stabilizing and maintaining materials during heat sealing according to claim 1, 4 or 5, characterized in that: The power output direction of the power source 1 (3) is not parallel to the straight line where the connecting transmission arm (21) is located, and an angle β is formed between the two.

7. The heat-sealing transmission mechanism for stabilizing the material during heat sealing according to claim 6, characterized in that: β is not 90°, 0°, or 180°.

8. The heat-sealing transmission mechanism for stabilizing materials during heat sealing according to claim 1, 4 or 5, characterized in that: The end cap (1) on one side is connected to a power source one (3) via a retaining transmission mechanism (2), and the end cap (1) on the other side is connected to a power source two (5) whose output direction is parallel to the movement direction of the end cap (1).

9. The heat-sealing transmission mechanism for stabilizing and maintaining materials during heat sealing according to claim 1, 4 or 5, characterized in that: The sealing heads (1) on both sides are connected to a power source (3) via a retaining transmission mechanism (2).

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