Supporting and limiting device of food plastic film blow molding machine

Abstract

The utility model relates to the field of blow molding machines, and discloses a supporting and limiting device for a food plastic film blow molding machine, which comprises a fixed ring, a rotating ring is rotatably connected in the fixed ring, an outer supporting rod is fixedly connected to the inner side of the fixed ring, a connecting arm is rotatably connected to the periphery of the outer supporting rod, a limiting groove is formed in the connecting arm, and the limiting groove is fixedly connected with the rotating ring. A limiting block is slidably connected into the limiting groove, a limiting assembly is fixedly connected to the inner side of the limiting block, an inner supporting rod is rotatably connected into the limiting assembly, and an electric push rod is hinged to the top end of the fixing ring. According to the utility model, the fixed ring, the rotating ring and the opening electric push rod are arranged, so that a plurality of groups of limiting rollers can deflect inwards at the same time, and when the rotating roller is in contact with a cylindrical film, the concentricity is higher, so that the size of the cylindrical film can be conveniently controlled, the precision of the size of the film is improved, and the shape of the cylindrical film is more regular when the cylindrical film is formed.

Description

Technical Field

[0001] The utility model relates to the field of blow molding machines, in particular to a supporting and limiting device for a food plastic film blow molding machine. Background Art

[0002] The food plastic film blow molding machine is a device used to produce food-grade plastic film. Its working principle is to heat and melt the plastic particles, and then form a mold cavity. After the cylindrical film prototype is blown out by wind power, the corresponding rolling parts roll the cylindrical film into a double-layer flat film to achieve film production. These films are usually used for food packaging to ensure the freshness and hygiene of food. The blow molding machine usually blows the plastic into a cylindrical film, cools it through an air ring, and then uses a herringbone roller to press the cylindrical film into a sheet. In order to control the size of the cylindrical film, a food plastic film blow molding machine support limit device is required.

[0003] After searching, Chinese patent announcement number: CN209350882U discloses a guiding mechanism of a PE film blowing machine, including a frame and an extrusion roller group arranged at the upper end of the frame, a limiting roller group and a support frame for supporting the limiting roller group are arranged at intervals in the circumferential direction in the frame, and the limiting roller group includes abutment rollers arranged at intervals in the vertical direction, and the rotation axis of the abutment rollers extends in the horizontal direction, and the abutment rollers abut against the outer side of the film tube. The utility model has the effect that the abutment roller abuts against the outer periphery of the film tube, limits the expansion range of the film tube, and thus improves the production quality of the film tube.

[0004] Although the device can limit the expansion range of the film tube, in actual use, the positions of the multi-layer limiting rollers need to be adjusted separately layer by layer, and the adjustment is not synchronized, which is troublesome to adjust and cannot be adjusted concentrically. It is easy to cause the film tube to be in a position where one side does not contact the limiting roller when being blown out, while the other side has been squeezed by the limiting roller, causing the shape of the film tube to deviate. Therefore, a support limiting device for a food plastic film blow molding machine is proposed to solve the above problems. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a support limit device for a food plastic film blow molding machine, aiming to improve the problems in the prior art such as the troublesome adjustment of the position of the limit rollers and the inability to concentrically adjust multiple sets of limit rollers.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a support and limit device for a food plastic film blow molding machine, comprising a fixed ring, a rotating ring rotatably connected inside the fixed ring, an outer support rod fixedly connected to the inner side of the fixed ring, a connecting arm rotatably connected to the outer periphery of the outer support rod, a limiting groove is provided inside the connecting arm, a limiting block is slidably connected inside the limiting groove, a limiting assembly is fixedly connected to the inner side of the limiting block, an inner support rod is rotatably connected inside the limiting assembly, an electric push rod is hinged on the top end of the fixed ring, a connecting bracket is fixedly connected to the rear telescopic end of the electric push rod, and a side protrusion is hinged on the bottom end of the connecting bracket.

[0007] As a further description of the above technical solution:

[0008] A sliding column groove is provided inside the fixed ring, a shock-absorbing ring groove is provided on the inner wall of the side of the sliding column groove, a shock-absorbing rubber ring is clamped inside the shock-absorbing ring groove, a shock-absorbing column is fixedly connected inside the shock-absorbing rubber ring, and a fixed bracket is elastically connected to the outer side of the fixed ring through a shock-absorbing spring.

[0009] As a further description of the above technical solution:

[0010] The limiting assembly comprises a telescopic block, the outer side of the telescopic block is fixedly connected to the inner side of the limiting block, a limiting roller is arranged on the inner side of the telescopic block, and an inner supporting rod is rotatably connected inside the telescopic block.

[0011] As a further description of the above technical solution:

[0012] The upper and lower ends of the inner support rod are fixedly connected to the inner side of the rotating ring.

[0013] As a further description of the above technical solution:

[0014] The inner side of the side protrusion is fixedly connected to the outer side of the rotating ring, and the bottom end of the side protrusion is in contact with the top end of the fixed ring.

[0015] As a further description of the above technical solution:

[0016] The shock absorbing column is arranged inside the sliding column groove and does not contact the side inner wall of the sliding column groove.

[0017] As a further description of the above technical solution:

[0018] The upper and lower ends of the shock-absorbing column are fixedly connected to the inner side of the fixing bracket.

[0019] As a further description of the above technical solution:

[0020] One end of the shock absorbing spring is fixedly connected to the inner side of the fixing bracket, and the other end of the shock absorbing spring is fixedly connected to the outer side of the fixing ring.

[0021] The utility model has the following beneficial effects:

[0022] 1. In the utility model, by setting a fixed ring, a rotating ring, and turning on the electric push rod, multiple groups of limiting rollers can be deflected inward at the same time. When the rotating rollers are in contact with the cylindrical film, the concentricity is high, so the size of the cylindrical film can be conveniently controlled, the accuracy of the film size is improved, and the shape of the cylindrical film is ensured to be relatively regular when it is formed.

[0023] 2. In the utility model, by arranging shock-absorbing columns and shock-absorbing springs, the fixing ring is arranged between the fixing brackets. When vibration occurs, the shock-absorbing rubber ring and the shock-absorbing spring will filter the vibration, thereby reducing the influence of the up and down vibrations generated when the blow molding tower is working on the limiting roller, and avoiding the up and down vibrations of the limiting roller to cause fine wrinkles on the surface of the cylindrical film. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an overall front view schematic diagram of a support and limiting device for a food plastic film blow molding machine proposed by the utility model;

[0025] Figure 2 It is a right side cross-sectional schematic diagram of a connecting arm of a supporting and limiting device of a food plastic film blow molding machine proposed by the utility model;

[0026] Figure 3 This is a schematic diagram of the top surface of a fixing ring of a supporting and limiting device for a food plastic film blow molding machine proposed by the utility model;

[0027] Figure 4 The utility model is a partial schematic diagram of the front section of a fixing ring of a supporting and limiting device of a food plastic film blow molding machine.

[0028] Legend:

[0029] 1. Fixed ring; 2. Rotating ring; 3. Outer support rod; 4. Connecting arm; 5. Limiting groove; 6. Limiting block; 7. Telescopic block; 8. Inner support rod; 9. Limiting roller; 10. Electric push rod; 11. Connecting bracket; 12. Side protrusion; 13. Sliding column groove; 14. Shock-absorbing ring groove; 15. Shock-absorbing rubber ring; 16. Shock-absorbing column; 17. Shock-absorbing spring; 18. Fixed bracket. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Reference Figure 1-Figure 2 The utility model provides an embodiment: a support and limiting device for a food plastic film blow molding machine, comprising a fixed ring 1, a rotating ring 2 is rotatably connected inside the fixed ring 1, the fixed ring 1 and the rotating ring 2 are provided with two groups, which are symmetrically arranged up and down, an outer support rod 3 is fixedly connected to the inner side of the fixed ring 1, the outer support rod 3 connects the upper and lower groups of fixed rings 1, and the outer support rod 3 is rotatably connected to the outer periphery of the outer support rod 3. The connecting arms 4 are provided with five groups, and each group of connecting arms 4 is evenly distributed on the outer support rod 3 from top to bottom, and each group of connecting arms 4 is provided with three, and the three connecting arms 4 are evenly distributed in a ring shape, and the two adjacent groups of connecting arms 4 rotate sixty degrees along the center of the fixed ring 1. A limiting groove 5 is provided inside the connecting arm 4, and a limiting block 6 is slidably connected inside the limiting groove 5. The limiting groove 5 limits the limiting block 6 to move only forward and backward along the inner wall of the limiting groove 5. A limiting component for limiting the size of the cylindrical film is fixedly connected to the inner side of the limiting block 6. The limiting component includes a telescopic block 7. The outer side of the telescopic block 7 is fixedly connected to the inner side of the limiting block 6. A limiting roller 9 is arranged on the inner side of the telescopic block 7. When the limiting roller 9 contacts the cylindrical film, it can roll to reduce the wrinkles of the cylindrical film. The telescopic block 7 is rotatably connected to an inner support rod 8. The upper and lower ends of the inner support rod 8 are fixedly connected to the inner side of the rotating ring 2, and the inner support rod 8 is rotatably connected to the inner side of the limiting component.

[0032] Reference Figure 3 An electric push rod 10 is hinged on the top of the fixed ring 1, and a connecting bracket 11 is fixedly connected to the telescopic end on the rear side of the electric push rod 10. When the electric push rod 10 is turned on, the telescopic end of the electric push rod 10 can drive the connecting bracket 11 to move forward and backward. At the same time, the electric push rod 10 can accurately control the telescopic amount of the telescopic end. A side protrusion 12 is hinged on the bottom end of the connecting bracket 11. The inner side of the side protrusion 12 is fixedly connected to the outer side of the rotating ring 2. The side protrusion 12 can drive the rotating ring 2 to rotate along the center of the rotating ring 2, and the bottom end of the side protrusion 12 contacts with the top of the fixed ring 1.

[0033] Reference Figure 4A sliding column groove 13 is provided inside the fixed ring 1, and a shock-absorbing ring groove 14 is provided on the inner wall of the side of the sliding column groove 13. Five groups of shock-absorbing ring grooves 14 are provided, which are linearly and evenly distributed on the inner wall of the sliding column groove 13. A shock-absorbing rubber ring 15 is clamped inside the shock-absorbing ring groove 14. The shock-absorbing rubber ring 15 is provided in three groups. When no force is applied, it is clamped inside the three middle groups of shock-absorbing ring grooves 14. The shock-absorbing rubber ring 15 is made of elastic rubber and will deform when squeezed. A shock-absorbing column 16 is fixedly connected inside the shock-absorbing rubber ring 15. The shock-absorbing column 16 is arranged inside the sliding column groove 13 and does not contact the sliding column The side inner walls of the groove 13 are in contact with each other, and the gap between them allows the deformed shock-absorbing rubber ring 15 to pass through. The upper and lower ends of the shock-absorbing column 16 are fixedly connected to the inner side of the fixed bracket 18. The outer side of the fixed ring 1 is elastically connected to the fixed bracket 18 fixed to the blow molding tower through the shock-absorbing spring 17. There are two groups of shock-absorbing springs 17, which are symmetrically arranged on the upper and lower sides of the fixed ring 1. One end of the shock-absorbing spring 17 is fixedly connected to the inner side of the fixed bracket 18, and the other end of the shock-absorbing spring 17 is fixedly connected to the outer side of the fixed ring 1. When the fixed ring 1 is not subjected to force, the shock-absorbing springs 17 on the upper and lower sides will be in a balanced state.

[0034] Working principle: When you want to control the size of the cylindrical film, turn on the electric push rod 10, the telescopic end of the electric push rod 10 moves backward, driving the connecting bracket 11 to move backward, and at the same time, the electric push rod 10 and the connecting bracket 11 rotate along the hinge point at the same time to ensure that the electric push rod 10 and the connecting bracket 11 remain relative, and the connecting bracket 11 moves backward to drive the side protrusion 12 to rotate along the center of the rotating ring 2. At this time, the rotating ring 2 rotates at the same time, and the rotating ring 2 drives all the inner support rods 8 to rotate. The inner support rods 8 drive the telescopic block 7 to rotate along the rotating ring 2, and the telescopic block 7 drives the limit block 6 to slide back and forth along the inner wall of the limit groove 5. At the same time, the telescopic block 7 and the connecting arm 4 are deflected to ensure relative, and at this time, the telescopic block 7 drives the limit roller 9 to deflect toward the inside of the rotating ring 2, thereby making all the limit rollers 9 move inward concentrically at the same time to limit the size of the cylindrical film. When one wants to reduce the influence of the vibration of the blow molding tower on the supporting limit device, the vibration is transmitted from the blow molding tower to the fixed bracket 18, the fixed bracket 18 generates vibration and squeezes the shock-absorbing spring 17, the shock-absorbing spring 17 buffers the vibration and is squeezed and releases the squeezing, driving the shock-absorbing column 16 to slide up and down, the shock-absorbing column 16 drives the shock-absorbing rubber ring 15 to slide inside the shock-absorbing ring groove 14, the shock-absorbing rubber ring 15 is deformed and generates a large resistance to offset the vibration of the shock-absorbing spring 17, thereby reducing the vibration of the fixed ring 1.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A support and limit device for a food plastic film blow molding machine, comprising a fixing ring (1), characterized in that: The fixing ring (1) is rotatably connected to a rotating ring (2) inside, the fixing ring (1) is fixedly connected to an outer support rod (3) inside, the outer support rod (3) is rotatably connected to a connecting arm (4) on its periphery, a limiting groove (5) is provided inside the connecting arm (4), a limiting block (6) is slidably connected inside the limiting groove (5), a limiting assembly is fixedly connected inside the limiting block (6), an inner supporting rod (8) is rotatably connected inside the limiting assembly, an electric push rod (10) is hingedly connected to the top end of the fixing ring (1), a connecting bracket (11) is fixedly connected to the rear telescopic end of the electric push rod (10), and a side protrusion (12) is hingedly connected to the bottom end of the connecting bracket (11).

2. A support and limit device for a food plastic film blow molding machine according to claim 1, characterized in that: The fixing ring (1) has a sliding column groove (13) formed inside, a shock-absorbing ring groove (14) formed on the inner side wall of the sliding column groove (13), a shock-absorbing rubber ring (15) clamped inside the shock-absorbing ring groove (14), a shock-absorbing column (16) fixedly connected inside the shock-absorbing rubber ring (15), and a fixing bracket (18) elastically connected to the outside of the fixing ring (1) via a shock-absorbing spring (17).

3. A support and limit device for a food plastic film blow molding machine according to claim 1, characterized in that: The limiting assembly comprises a telescopic block (7), the outer side of the telescopic block (7) being fixedly connected to the inner side of the limiting block (6), the inner side of the telescopic block (7) being provided with a limiting roller (9), and the inner side of the telescopic block (7) being rotatably connected to an inner support rod (8).

4. A support and limit device for a food plastic film blow molding machine according to claim 1, characterized in that: The upper and lower ends of the inner support rod (8) are fixedly connected to the inner side of the rotating ring (2).

5. A support and limit device for a food plastic film blow molding machine according to claim 1, characterized in that: The inner side of the side protrusion (12) is fixedly connected to the outer side of the rotating ring (2), and the bottom end of the side protrusion (12) is in contact with the top end of the fixed ring (1).

6. A support and limit device for a food plastic film blow molding machine according to claim 2, characterized in that: The shock absorbing column (16) is arranged inside the sliding column groove (13) and does not contact the side inner wall of the sliding column groove (13).

7. A support and limit device for a food plastic film blow molding machine according to claim 2, characterized in that: The upper and lower ends of the shock absorbing column (16) are fixedly connected to the inner side of the fixed bracket (18).

8. A support and limit device for a food plastic film blow molding machine according to claim 2, characterized in that: One end of the shock absorbing spring (17) is fixedly connected to the inner side of the fixing bracket (18), and the other end of the shock absorbing spring (17) is fixedly connected to the outer side of the fixing ring (1).

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