Roll type packaging bag unwinding device

Abstract

The utility model relates to the technical field of material packaging, and discloses a roll type packaging bag unwinding device which comprises a base, an unwinding shaft used for supporting a packaging bag and a plurality of guide rollers used for guiding the packaging bag, and the guide rollers comprise a plurality of upper guide rollers and lower guide rollers located among the upper guide rollers. The lower guide roller is rotationally connected with a support base, the support base and the base are rotationally connected or hinged relatively, and elastic pieces are connected between the two sides of the support base and the base in an abutting mode. The support base can swing under the action of external force in one direction and the action force in the opposite direction of one elastic piece. According to the utility model, the guide roller can automatically swing along with the pre-tightening force, so that the dynamic balance of the pre-tightening force can be kept, and the technical effect of ensuring the unwinding speed is further achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of material packaging, in particular to a rewinding device for roll-type packaging bags. Background Art

[0002] The environmental protection calcium-zinc stabilizer is an additive used in plastic processing. It is mainly composed of calcium salts, zinc salts and auxiliary stabilizers, etc. The finished product is in powder form. The traditional packaging process of calcium-zinc stabilizers mainly relies on manual labor, that is, manual actions such as taking, opening the mouth, loading materials, and sealing are performed.

[0003] In order to achieve automatic packaging, the packaging bag is designed as a roll-type structure in the industry, and a rewinding device can be used to achieve automatic rewinding, so as to facilitate subsequent functions such as automatic cutting, automatic opening of the mouth, and automatic loading of materials.

[0004] However, the existing rewinding device has the defect that the tension is not constant during the rewinding process, resulting in the need for further judgment on whether the bag mouth reaches the cutting station accurately during subsequent cutting. Summary of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a rewinding device for roll-type packaging bags.

[0006] The rewinding device for roll-type packaging bags according to the utility model includes a base, a rewinding shaft for supporting the packaging bag, and a plurality of guide rollers for guiding the packaging bag. The rewinding shaft and the guide rollers are rotatably connected to the base, and the guide rollers can be driven by a power device such as a motor. As a power source, the guide rollers further guide the packaging bag to enable it to smoothly transition to the next station.

[0007] Specifically, the plurality of guide rollers include a plurality of upper guide rollers and a lower guide roller located between the plurality of upper guide rollers. The purpose of such a setting is that when the plurality of upper guide rollers and the lower guide roller guide the packaging bag, the packaging bag presents a V-shaped structure, preparing for the automatic adjustment of the subsequent tension.

[0008] The main difference between this rewinding device for roll-type packaging bags and the traditional rewinding device lies in that the lower guide roller is rotatably connected to a support seat, the support seat is rotatably connected or hinged to the base, and elastic members are abutted between both sides of the support seat and the base, enabling the support seat to swing under the action of an external force in one direction and the opposite-direction acting force of one of the elastic members;

[0009] The advantages of such a setting are as follows: During the unrolling process, when the pre-tightening force is balanced, the lower guide roller and the support base are in a vertical state under the action of the elastic members on both sides. When the pre-tightening force changes, it drives the lower guide roller to deflect, and then drives the support base, thereby offsetting the changing pre-tightening force to make it balanced. Only when the pre-tightening force returns to the balanced state again, the deformation force of the elastic member makes the lower guide roller and the support base in a vertical state, that is, the lower guide roller can swing automatically following the pre-tightening force, so as to maintain the dynamic balance of the pre-tightening force, and further ensure the unrolling speed.

[0010] In some examples of the present utility model, the elastic member is a torsion spring, and a plurality of torsion springs are provided on both sides of the support base.

[0011] In some examples of the present utility model, the support base includes supports provided at both ends of the lower guide roller, and the upper ends of all the supports are connected to the lower guide roller through first bearings;

[0012] The purpose of such a setting is: to realize the rotational connection between the lower guide roller and the support base through the first bearing, so that the lower guide roller can rotate freely to assist the unrolling action of the packaging bag.

[0013] In some examples of the present utility model, the support base further includes a connecting shaft, the connecting shaft is located at the lower end of the lower guide roller, its extending direction is parallel to the extending direction of the lower guide roller, and its two ends are respectively fixedly connected to the lower ends of the supports;

[0014] The function of the connecting shaft is: as the bottom shaft of the support base, it can connect the supports at both ends, and further act on the entire lower guide roller;

[0015] In some examples of the present utility model, the base includes a shaft housing, the shaft housing is fixed relative to the base, the connecting shaft is placed in the shaft housing, and is rotationally connected to the shaft housing through a second bearing, that is, the connecting shaft and the shaft housing are rotationally connected through the second bearing to ensure its free rotation, and prepare for the swing of the lower guide roller.

[0016] In some examples of the present utility model, a guiding shaft passes through the middle parts of a plurality of torsion springs on the same side of the support base, and both ends of the guiding shaft are connected to the shaft housing;

[0017] The function of setting the guiding shaft is: to play a certain limiting role on the torsion springs on the same side, and prevent the torsion springs from detaching from the connecting shaft and the shaft housing.

[0018] In some examples of the present utility model, it further includes a bearing housing and a support sleeve. The bearing housing is located at both ends of the lower guide roller, so that both ends of the guide roller respectively penetrate through the bearing housings at both ends. Both ends of the support sleeve are respectively connected to the bearing housing and the shaft housing. The support is placed in the support sleeve, and its two ends respectively extend into the bearing housing and the shaft housing.

[0019] The bearing box and the bracket sleeve have the functions of protecting the first bearing and the bracket and preventing the packaging bag from being rolled into the bearing or the bracket.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a three-dimensional diagram of the unwinding device of the roll-type packaging bag in the embodiment of the utility model;

[0023] Figure 2 It is a cross-sectional view of the lower guide roller and its related structures in the embodiment of the utility model in the front view;

[0024] Figure 3 It is a cross-sectional view of the lower guide roller and its related structure in the embodiment of the utility model in the side view.

[0025] Description of reference numerals:

[0026] Base 1;

[0027] Unwind reel 2;

[0028] Upper guide roller 3;

[0029] Lower guide roller 4;

[0030] Bracket seat 5, bracket 5-1, connecting shaft 5-2;

[0031] Elastic member 6;

[0032] First bearing 7;

[0033] Axle box 8, axle box bottom cover 8-1;

[0034] Second bearing 9;

[0035] Guide shaft 10;

[0036] Bearing box 11, arc-shaped through hole 11-1;

[0037] Bracket sleeve 12;

[0038] Motor 13. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0040] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the accompanying drawings. These are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0041] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present utility model and should not be construed as a limitation to the present utility model.

[0043] Below, reference is made to Figures 1 to 3 Describe a roll-type packaging bag unwinding device provided according to an embodiment of the present utility model.

[0044] Specifically, please refer to Figure 1As shown in the figure, the unwinding device for the roll-type packaging bag includes a base 1, an unwinding shaft 2 for supporting the packaging bag, and three guide rollers for guiding the packaging bag. The guide rollers include two upper guide rollers 3 and a lower guide roller 4 located between the two upper guide rollers 3;

[0045] In some embodiments, the base 1 is the basic support structure of the entire unwinding device for the roll-type packaging bag, providing a stable installation platform for other components. It is made of metal materials and can withstand various forces and torques generated during the unwinding process to ensure the overall stability of the device;

[0046] In some other embodiments, the unwinding shaft 2 is used to support the roll-type packaging bag, enabling it to rotate smoothly during the unwinding process. It is driven by a motor or manually to achieve continuous unwinding of the packaging bag;

[0047] In some other embodiments, the base 1 is divided into two parts, which are connected by a slide rail. The unwinding shaft 2 is rotatably connected to one of the parts, and a motor 13 is provided on this part. The motor 13 is used to drive the unwinding shaft 2 to rotate to provide unwinding power. When the two parts are separated, one end of the unwinding shaft 2 is free and can perform the operation of loading the roll. After the two parts are connected, one end of the unwinding shaft 2 is also connected to the other part to achieve the support of the unwinding shaft 2.

[0048] Please refer to the appendix Figure 2 As shown in the figure, the lower guide roller 4 is rotatably connected to a support seat 5. The support seat 5 is relatively rotatably connected to the base 1, and elastic members 6 are abutted between both sides of the support seat 5 and the base 1, enabling the support seat 5 to swing under the action of an external force in one direction and the acting force in the opposite direction of one of the elastic members 6;

[0049] Specifically, the upper guide roller 3 plays a role in guiding the packaging bag during the unwinding process. It is located at a relatively high position and cooperates with the lower guide roller 4 to ensure that the packaging bag maintains the correct direction and flatness during the unwinding process. The number and position of the guide rollers can be adjusted according to actual needs to adapt to different packaging bag sizes and unwinding requirements;

[0050] In this embodiment, the lower guide roller 4 and the upper guide roller 3 together constitute the guiding system of the packaging bag. The lower guide roller 4 is located between the two upper guide rollers 3 and can swing relative to the base 1 within a certain range through the connection with the support seat 5 to adapt to the tension change of the packaging bag;

[0051] And in this embodiment, the design of the elastic member 6 can effectively buffer the tension change of the packaging bag to ensure the stability of the unwinding process,

[0052] Please refer to the appendix Figure 2 and Figure 3As shown, the elastic member 6 is a torsion spring. A number of torsion springs are provided on both sides of the bracket seat 5. The combined action of these torsion springs acts on the bracket seat 5, providing sufficient force to the bracket seat 5.

[0053] Please continue to refer to the appendix Figure 2 and Figure 3 As shown, the bracket seat 5 includes brackets 5-1 provided at both ends of the lower guide roller 4. The upper ends of all brackets 5-1 are connected to the lower guide roller 4 through first bearings 7. The brackets 5-1 are made of metal materials and can bear the weight of the lower guide roller 4 and the forces generated during the unwinding process. The first bearings 7 assist the lower guide roller 4 to rotate freely and guide the packaging bag, while not affecting the adjustment of the tension.

[0054] Please continue to refer to the appendix Figure 2 and Figure 3 As shown, the bracket seat 5 further includes a connecting shaft 5-2. The connecting shaft 5-2 is located at the lower end of the lower guide roller 4, and its extending direction is parallel to that of the lower guide roller 4. The two ends of the connecting shaft 5-2 are respectively welded to the lower ends of the brackets 5-1. Its function is to connect the brackets 5-1 at both ends together, enhance the stability of the bracket seat 5, and at the same time provide sufficient acting area for a number of elastic members 6.

[0055] Please continue to refer to the appendix Figure 2 and Figure 3 As shown, the base 1 includes an axle box 8. The axle box 8 is fixed relative to the base 1. The connecting shaft 5-2 is placed inside the axle box 8 and is connected to the axle box 8 through a second bearing 9. This connection method enables the bracket seat 5 to rotate relative to the axle box 8, realizing the swing function of the lower guide roller 4.

[0056] Please continue to refer to the appendix Figure 2 and Figure 3 As shown, the axle box 8 includes an axle box bottom cover 8-1. The axle box bottom cover 8-1 is used to close the axle box 8 by screws.

[0057] Please continue to refer to the appendix Figure 2 and Figure 3 As shown, a guide shaft 10 passes through the middle parts of a number of torsion springs on the same side of the bracket seat 5. The two ends of the guide shaft 10 are connected to the axle box 8. The function of the guide shaft 10 is to fix the position of the torsion springs and ensure that the torsion springs can play an elastic role in the correct direction.

[0058] Please continue to refer to the appendix Figure 2 and Figure 3As shown, the unwinding device further includes a bearing box 11 and a bracket sleeve 12. The bearing box 11 is located at both ends of the lower guide roller 4, so that both ends of the guide roller penetrate through the bearing boxes 11 at both ends respectively. Both ends of the bracket sleeve 12 are respectively connected to the bearing box and the axle box 8. The bracket 5-1 is placed inside the bracket sleeve 12, and both ends thereof extend into the bearing box 11 and the axle box 8 respectively. Among them, the function of the bearing box 11 is to provide a certain supporting effect for the lower guide roller 4 and also to protect the first bearing 7. The bracket sleeve 12 is used to protect the bracket 5-1 and the connecting shaft 5-2 from the influence of the external environment.

[0059] Please continue to refer to the attached Figure 3 , and an arc-shaped through hole 11-1 is formed in the bearing box 11 for assisting the swinging operation of the lower guide roller 4.

[0060] Other components of the unwinding device according to the embodiments of the present invention, such as the structure of the unwinding shaft, the structure of the guide roller, the connection structure between the guide roller and the base, the motor, etc., and the operations are known to those of ordinary skill in the art and will not be described in detail here.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples" or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0062] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. The unwinding device for the roll-type packaging bag, characterized in that, It includes a base, a pay-off reel for supporting a packaging bag, and a plurality of guide rollers for guiding the packaging bag. The plurality of guide rollers include a plurality of upper guide rollers and a lower guide roller located between the plurality of upper guide rollers. The lower guide roller is rotatably connected to a bracket seat. The bracket seat is relatively rotatably connected or hinged to the base, and elastic members are abutted between both sides of the bracket seat and the base, so that the bracket seat can swing under the action of an external force in one direction and the acting force in the opposite direction of one of the elastic members.

2. The unwinding device for the roll-type packaging bag according to claim 1, wherein, The elastic member is a torsion spring, and a plurality of torsion springs are provided on both sides of the bracket seat.

3. The unwinding device for the roll-type packaging bag according to claim 2, characterized in that, The bracket seat includes brackets provided at both ends of the lower guide roller. The upper ends of all the brackets are connected to the lower guide roller through first bearings.

4. The unwinding device for the roll-type packaging bag according to claim 3, characterized in that, The bracket seat further includes a connecting shaft. The connecting shaft is located at the lower end of the lower guide roller, and its extending direction is parallel to the extending direction of the lower guide roller, and both ends thereof are fixedly connected to the lower ends of the brackets respectively.

5. The unwinding device for the roll-type packaging bag according to claim 4, characterized in that, The base includes an axle box, the axle box is fixed relative to the base, the connecting shaft is placed in the axle box and is connected to the axle box through a second bearing.

6. The unwinding device for the roll-type packaging bag according to claim 5, characterized in that, A guide shaft penetrates through the middle parts of a plurality of torsion springs on the same side of the bracket seat, and both ends of the guide shaft are connected to the axle box.

7. The unwinding device for the roll-type packaging bag according to claim 5 or 6, characterized in that, It further includes a bearing box and a bracket sleeve. The bearing box is located at both ends of the lower guide roller, so that both ends of the guide roller respectively penetrate through the bearing boxes at both ends. Both ends of the bracket sleeve are respectively connected to the bearing box and the axle box. The bracket is placed in the bracket sleeve, and both ends thereof respectively extend into the bearing box and the axle box.

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