A curved elastic band applying mechanism with double swing arms

Abstract

The present invention relates to the field of disposable sanitary product production equipment, and more specifically, to a curved elastic band application mechanism with two swing arms, wherein a frame is provided with a guide mechanism for guiding the elastic band, the guide mechanism comprising a main swing motor arranged in pairs and a main swing arm mounted at the output end of the main swing motor, an auxiliary swing arm hingedly mounted at the end of the main swing arm, the auxiliary swing arm having a circular base and an extension end fixed to the base, the extension end being provided with a guide groove for the elastic band to be inserted, the elastic band being applied to the production line via the auxiliary swing arm, the main swing arm and the auxiliary swing arm being mounted perpendicularly to the production line, the length of the main swing arm being greater than the length of the auxiliary swing arm, and when the auxiliary swing arm swings, the angle between the centerline of the auxiliary swing arm and the vertical direction is no greater than 15 degrees, and the auxiliary swing arm being connected to the auxiliary swing motor for driving the swinging thereof. The present invention solves the problem of uneven spacing of the elastic bands during the application of curved elastic bands.

Description

Technical Field

[0001] The invention relates to the field of disposable sanitary product production equipment, and in particular to a curved elastic band applying mechanism with double swing arms. Background Art

[0002] In the production process of disposable sanitary products, when curved elastic bands are required, the input elastic bands are shaken through a guide device so that the continuous elastic bands are compounded on the fabric of the sanitary products.

[0003] Chinese patent application number: CN201620819778.X discloses a curved rubber band applying device, comprising a frame, an upper composite wheel rotatably mounted on the frame, a lower composite wheel rotatably mounted on the frame, two rubber band releasing wheels rotatably mounted on the frame, and a servo motor. The servo motor drives a swing arm to swing, thereby achieving the input of the curved rubber band.

[0004] Through long-term manufacturing and testing, the applicant has found that although the curved rubber band applying device of the application can adapt to modern high-speed production lines, in actual use, the swing arm movement is a rotational movement, and the rubber band is controlled to make a circular motion, which makes the rubber band unstable when working at high speed; and in production, when the rubber band is applied in a curved shape, multiple strands usually need to be applied synchronously. In this process, the applicant has a prior application CN112704599B, which shows the structure of the currently used applying device. In order to ensure that multiple strands of rubber bands do not interfere with each other, a slot on the swing arm is designed to transmit the rubber band in a branched manner; another example is Figure 1 The figure shows the distribution structure of the existing curved rubber band after application. At the position x in the figure, the spacing between the rubber bands becomes smaller due to the large rotational inertia of the swing arm or the swing amplitude, resulting in uneven application of the curved rubber band as a whole, which affects the comfort of the finished sanitary product.

[0005] On this basis, in order to further improve the uniformity between the rubber bands and ensure that they do not interfere with each other, this design was developed. Summary of the Invention

[0006] Therefore, the present invention provides a curved rubber band applying mechanism with double swing arms, which solves the problem of uneven rubber band spacing during the curved rubber band applying process.

[0007] To achieve the above object, the present invention is achieved through the following technical solutions:

[0008] A curved rubber band applying mechanism with double swing arms, wherein a guide mechanism for guiding the rubber band is provided on the frame, the guide mechanism includes a main swing motor arranged in a pair and a main swing arm installed at the output end of the main swing motor, an auxiliary swing arm is hingedly installed at the end of the main swing arm, the auxiliary swing arm has a circular base and an extension end fixed to the base, the extension end is provided with a guide groove for the rubber band to pass through, the rubber band is applied to the assembly line through the auxiliary swing arm, the main swing arm and the auxiliary swing arm are installed vertically to the assembly line, the length of the main swing arm is greater than the length of the auxiliary swing arm, and when the auxiliary swing arm swings, the angle between the center line of the auxiliary swing arm and the vertical direction is no more than 15 degrees.

[0009] Preferably, the auxiliary swing arm is connected to an auxiliary swing motor for driving the auxiliary swing arm to swing.

[0010] Preferably, the auxiliary swing motor and the auxiliary swing arm are connected by a belt transmission.

[0011] Preferably, a counterweight is installed on the auxiliary swing arm to reduce its swing amplitude.

[0012] Preferably, the main swing arm is provided with an elastic limiting plate for limiting the swing angle of the auxiliary swing arm.

[0013] Preferably, a shock-absorbing pad is provided on the surface of the elastic limiting plate.

[0014] Preferably, the cross-sections of the main swing arm and the auxiliary swing arm are U-shaped.

[0015] Preferably, the angle between the center line of the auxiliary swing arm and the vertical direction is not greater than 10 degrees.

[0016] By adopting the above technical solution, the beneficial effects of the present invention are:

[0017] In this technical solution, a small-sized auxiliary swing arm is designed. During the application of the curved rubber band, the main swing arm is driven by the main swing motor to swing, so that the position of the rubber band is swung into place, and then the position is fine-tuned by the auxiliary swing arm. Among them, the main swing arm has a large swing amplitude as a large action component, and its moment of inertia can be used for the passive swing of the hinged auxiliary swing arm during rotation. Compared with the structure of a single swing arm, the moment of inertia of the auxiliary swing arm on the double swing arm can greatly reduce the swing amplitude of the auxiliary swing arm and reduce the force on the rubber band when the auxiliary swing arm swings, forming a flexible guiding structure to ensure that the spacing between the rubber bands is uniform during guidance, thereby ensuring the comfort of the produced hygiene products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the distribution structure after the curved rubber band is applied;

[0019] Figure 2 This is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the position change structure of the main swing arm and the auxiliary swing arm in embodiment 1 of the present invention;

[0021] Figure 4 This is a schematic structural diagram of a main swing arm according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic structural diagram of a main swing arm and an auxiliary swing arm according to a second embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the second auxiliary swing arm as viewed from the left according to an embodiment of the present invention.

[0024] Figure numerals: 100, frame; 1, main swing arm; 11, main swing motor; 12, reducer; 2, auxiliary swing arm; 21, auxiliary swing motor; 22, synchronous wheel; 23, synchronous belt; 2a, base; 2b, extension end; 24, guide groove; 25, counterweight block; 26, elastic limit plate; 261, plate; 262, buffer spring; 263, shock-absorbing pad. DETAILED DESCRIPTION

[0025] The following will describe the implementation methods of the present invention in detail with reference to specific embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0026] Example 1

[0027] refer to Figures 2 to 4 A curved rubber band applying mechanism includes a frame 100, on which a guiding mechanism for guiding the rubber band is provided. The guiding mechanism includes a main swing motor 11 arranged in pairs and a main swing arm 1 installed at the output end of the main swing motor 11. The end of the main swing arm 1 is hingedly mounted with a secondary swing arm 2. The rubber band is applied to the assembly line via the secondary swing arm 2. The length of the main swing arm 1 is greater than that of the secondary swing arm 2. In the present technical solution, a small-sized auxiliary swing arm 2 is designed. During the application of the curved rubber band, the main swing arm 1 is driven by the main swing motor 11 to swing, so that the position of the rubber band is swung into place, and then the position is fine-tuned by the auxiliary swing arm 2. The main swing arm 1 acts as a large action component with a large swing amplitude, and its moment of inertia can be used for the passive swing of the hinged auxiliary swing arm 2 during rotation. Compared with the structure of a single swing arm, the moment of inertia of the auxiliary swing arm 2 on the double swing arm can greatly reduce the swing amplitude of the auxiliary swing arm 2 and reduce the force on the rubber band when the auxiliary swing arm 2 swings, thereby forming a flexible guiding structure to ensure that the spacing between the rubber bands is uniform during guidance, thereby ensuring the comfort of the produced hygiene products.

[0028] like Figure 2 As shown, in this embodiment, the installation direction of the main swing arm 1 and the auxiliary swing arm 2 is perpendicular to the assembly line; that is, the auxiliary swing arm 2 and the main swing arm 1 swing at a position perpendicular to the assembly line to convey the rubber band; due to the vertical arrangement, the design is such that when the auxiliary swing arm 2 swings, the angle α between the center line of the auxiliary swing arm 2 and the vertical direction is no more than 15 degrees. The smaller the amplitude of this angle, the smaller the change in the spacing between the rubber bands, so that the rubber bands are in a relatively stable guided transmission; especially in the production of some small products, the single swing cycle is short, and the angle α between the center line of the auxiliary swing arm 2 and the vertical direction can be designed to be no more than 10 degrees to ensure the stability of the spacing between the rubber bands.

[0029] The specific implementation process of this embodiment is as follows: the auxiliary swing arm 2 is connected to a secondary swing motor 21 that drives its swing. In this structure, the auxiliary swing motor 21 can be designed according to the swing period of the main swing arm 1 to adjust the auxiliary swing arm 2's rotation angle, speed, and other parameters, thereby achieving accurate control of the rubber band's trajectory. The auxiliary swing motor 21 and the auxiliary swing arm 2 are connected by a belt drive, specifically a synchronous pulley 22 mounted on the auxiliary swing arm 2 and the auxiliary swing motor 21, and a synchronous belt 23 wrapped around each synchronous pulley 22. The operation of the auxiliary swing motor 21 drives the auxiliary swing arm 2 to rotate accordingly on the main swing arm 1. During the application of the curved rubber band, the main swing motor 11 drives the main swing arm 1 in periodic reciprocating motion on the assembly line. During this process, the auxiliary swing arm 2, based on its hinged connection to the main swing arm 1, can be fine-tuned in rotation angle by the auxiliary swing motor 21, thereby achieving the effect of precisely controlling its swing position and more accurately regulating the position and trajectory of each rubber band.

[0030] Accordingly, the main swing arm 1 and auxiliary swing arm 2 are installed in a direction parallel to the assembly line; or the main swing arm 1 and auxiliary swing arm 2 are installed in a direction oblique to the assembly line. These structures are variations of the vertical arrangement described above. While the dual swing arm structure remains unchanged, they can also meet the requirements for elastic band arrangement. The positions of the main swing motor 11 and auxiliary swing motor 21 can be adaptively adjusted. No further details will be given here.

[0031] In this embodiment, Figure 4 As shown, the cross-sections of the main swing arm 1 and the auxiliary swing arm 2 are U-shaped. Structurally, this can increase the structural strength of the main swing arm 1 and the auxiliary swing arm 2, especially for the main swing arm 1, reducing the slight deformation during movement and ensuring accurate transmission.

[0032] Specific as Figure 2 、 Figure 3As shown, the auxiliary swing arm 2 has a circular base 2a and an extension 2b fixed to the base 2a. The extension 2b is provided with a guide slot 24 for the rubber band to pass through. This auxiliary swing arm 2 is shorter in length, and the time required to rotate the same swing angle is shortened. For fine-tuning, the response speed is fast, and the rubber band's transmission and guiding path is reduced, thereby ensuring accurate and rapid positioning during swinging.

[0033] The main swing motor 11 and the auxiliary swing motor 21 are both connected to corresponding adaptive reducers 12 to meet the swing transmission requirements, which is well known to those skilled in the art and will not be elaborated on here.

[0034] This technical solution does not describe other structures of the curved rubber band applying mechanism. For details, please refer to the applicant's prior application CN 112704599 B, which includes the structure of the assembly line, the composite materials, etc., which are described. This is not the main improvement of this technical solution and will not be described in detail here.

[0035] Example 2

[0036] refer to Figure 5 、 Figure 6 Compared to the first embodiment, this embodiment provides a simpler structure. Specifically, a counterweight 25 is installed on the auxiliary swing arm 2 to reduce its swing amplitude. This embodiment does not have any actively driven components for the auxiliary swing arm 2, but instead provides a counterweight 25. Due to the vertical arrangement, the auxiliary swing arm 2 can further reduce its swing amplitude under a certain weight structure. The structure is simple and easy to implement. Although compared to the first embodiment, it cannot achieve flexible fine-tuning of the spacing between the individual rubber strands, it is still a usable and convenient implementation method and meets the purpose of the invention of this application.

[0037] At the same time, the main swing arm 1 is provided with an elastic limit plate 26 for limiting the swing angle of the auxiliary swing arm 2. The elastic limit plate 26 comprises a plate 261 and a buffer spring 262. The position of the plate 261 can be adjusted as needed to limit the swing angle of the auxiliary swing arm 2, allowing it to swing within a reasonable angle range and meet the uniformity requirement of the elastic band spacing.

[0038] In addition, a shock-absorbing pad 263 is provided on the surface of the elastic limiting plate 26; this structure can reduce the collision noise when the auxiliary swing arm 2 contacts the plate 261, and reduce the wear of the auxiliary swing arm 2 and the large shaking generated during contact, thereby ensuring the stability of the swing.

[0039] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A double-swing arm curved rubber band applying mechanism, characterized by: The frame is provided with a guiding mechanism for guiding the rubber band, and the guiding mechanism includes a main swing motor arranged in pairs and a main swing arm installed at the output end of the main swing motor. The end of the main swing arm is hingedly installed with an auxiliary swing arm, and the auxiliary swing arm has a circular base and an extension end fixed on the base. The extension end is provided with a guide groove for the rubber band to pass through. The rubber band is applied to the assembly line through the auxiliary swing arm. The main swing arm and the auxiliary swing arm are installed vertically between the assembly line. The length of the main swing arm is greater than that of the auxiliary swing arm. When the auxiliary swing arm swings, the angle between the center line of the auxiliary swing arm and the vertical direction is not greater than 15 degrees; the auxiliary swing arm is connected to the auxiliary swing motor for driving it to swing.

2. The curved elastic band applying mechanism for a double swing arm according to claim 1, characterized in that: The auxiliary swing motor and the auxiliary swing arm are connected via a belt transmission.

3. The curved elastic band applying mechanism for a double swing arm according to claim 1, characterized in that: A counterweight block for reducing the swing amplitude of the auxiliary swing arm is installed on the auxiliary swing arm.

4. The curved elastic band applying mechanism for a double swing arm according to claim 3, characterized in that: The main swing arm is provided with an elastic limiting plate for limiting the swing angle of the auxiliary swing arm.

5. The curved elastic band applying mechanism for a double swing arm according to claim 4, characterized in that: A shock-absorbing pad is provided on the surface of the elastic limiting plate.

6. A curved rubber band applying mechanism for a double swing arm according to any one of claims 1 to 5, characterized in that: The cross sections of the main swing arm and the auxiliary swing arm are U-shaped structures.

7. A curved rubber band applying mechanism for a double swing arm according to any one of claims 1 to 5, characterized in that: The angle between the center line of the auxiliary swing arm and the vertical direction is not greater than 10 degrees.

Images