Blanking mechanism of packing scale

Abstract

The utility model relates to a blanking mechanism of a packing scale. The blanking mechanism comprises a supporting cylinder and a box body, a hopper, a discharging door and a servo motor are arranged in the supporting cylinder. The upper and lower parts of the hopper are conical and special-shaped parts respectively. The upper end of the conical part is connected with the upper end of the supporting cylinder. The upper end of the special-shaped part is connected with the lower end of the conical part. The special-shaped part is characterized in that a pair of opposite pipe walls of the special-shaped part are high and low pipe walls respectively, and the other pair of opposite pipe walls are the same in shape and are arc-shaped walls. Shaft seats are arranged on two vertical sides close to the upper end of the high pipe wall, a rotating shaft is arranged between the two shaft seats, and an output shaft of the servo motor is connected with one end of the rotating shaft. The discharging door comprises two fan-shaped plates located outside the two arc-shaped walls respectively, the circle centers of the two fan-shaped plates are both fixed to the rotating shaft, and an arc-shaped door plate is connected between the arc-shaped edges of the two fan-shaped plates. According to the utility model, the weighing precision can be improved. The packing scale is suitable for packing bulk materials.

Description

Technical Field

[0001] The utility model relates to a packaging scale, specifically, a material dropping mechanism used in conjunction with the packaging scale, and is particularly suitable for packaging scales for packaging bulk materials such as bulk fertilizers. Background Art

[0002] It is well known in the fertilizer production industry that when bulk fertilizer is packaged, the bulk fertilizer needs to be fed into the weighing drum for weighing through a blanking mechanism. The traditional blanking mechanism contains a support cylinder, which contains a hopper and a blanking door and its servo motor. The upper and lower parts of the hopper are respectively a conical part and a special-shaped part. The upper end of the conical part is larger than its lower end, and its upper end is connected to the upper end of the support cylinder. The special-shaped part is a square tube, and its upper end is connected to the lower end of the conical part. One pair of sides of its lower end are flat sides, and the other pair of sides are arc sides. There is an axial hole in the middle of the upper ends of the two tube walls where the two arc sides are located, and a rotating shaft is installed between the two axial holes with the help of an axle seat and a bearing. There are fan-shaped plates on the outer sides of the two tube walls where the two arc sides are located, and the centers of the two fan-shaped plates are respectively fixed at the two ends of the rotating shaft, and an arc door plate is connected between their fan-shaped sides. The area of ​​the arc door plate is adapted to the area enclosed by the lower ends of the two tube walls where the two arc edges are located, so that the bulk materials in the hopper can be completely blocked in the non-dropping state. Among them, one end of the rotating shaft is connected to a servo motor. It can be seen that in the non-working state, the arc edges of the two fan-shaped plates are located at their lower ends, and the arc door plate is also located at the lower end of the hopper under the action of its own weight. In this way, when working, the servo motor drives the rotating shaft, the fan-shaped plate connected to the rotating shaft, and the arc door plate connected to the fan-shaped plate to rotate around the rotating shaft together, so that the arc door plate moves in one direction along the lower ends of the two tube walls where the arc edges are located, so that the arc door plate is slowly opened, and the bulk materials in the hopper slowly fall into the weighing barrel. While the arc door plate is slowly opening and falling, the material falling position is slowly moving, from the initial falling into the weighing barrel to the other side, so that the weighing barrel shakes during the entire dropping process, thereby affecting the weighing accuracy. Therefore, the weighing accuracy of the packaging scale using this blanking mechanism is not high. Utility Model Content

[0003] The problem to be solved by the utility model is to provide a packaging scale blanking mechanism, which can improve the weighing accuracy.

[0004] The above-mentioned problems to be solved by the utility model are achieved by the following technical solutions:

[0005] The blanking mechanism of the packaging scale of the utility model comprises a support tube and a box body. The support tube contains a hopper and a discharge door and a servo motor thereof. The upper and lower parts of the hopper are respectively a conical part and a special-shaped part. The upper end of the conical part is larger than the lower end thereof, and the upper end thereof is connected to the upper end of the support tube on all sides. The special-shaped part is tubular, and the upper end thereof is rectangular and connected to the lower end of the conical part. The characteristic is that a pair of opposite tube walls of the special-shaped part are respectively a high tube wall and a low tube wall, and the other pair of opposite tube walls are of the same shape and they transition in an arc shape from the lower side of the high tube wall to the lower side of the low tube wall to form an arc wall. There are shaft seats on both vertical sides adjacent to the upper end of the high tube wall, and there is a rotating shaft between the two shaft seats, and the output shaft of the servo motor is connected to one end of the rotating shaft. The unloading door comprises two fan-shaped plates, which are respectively located outside the two arc-shaped walls, and their centers are fixed on the rotating shaft. An arc-shaped door plate is connected between their arc-shaped edges, and the size of the arc-shaped door plate is adapted to the area enclosed by the arc-shaped edges of the two arc-shaped walls.

[0006] The top of the box body is provided with a through hole which is matched with the lower end of the support cylinder. The box body is provided with a weighing cylinder, the mouth of which is matched with the through hole.

[0007] It can be seen from the above technical solution that since the pair of tube walls opposite to the special-shaped part are respectively a high tube wall and a low tube wall, the other pair of tube walls opposite to them are of the same shape and they transition in an arc shape from the lower edge of the high tube wall to the lower edge of the low tube wall to form an arc wall. There are shaft seats on both vertical sides adjacent to the upper end of the high tube wall, and there is a rotating shaft between the two shaft seats, and the output shaft of the servo motor is connected to one end of the rotating shaft. The unloading door contains two fan-shaped plates, which are respectively located outside the two arc walls, and their centers are fixed on the rotating shaft. There is an arc door plate connected between their arc edges, and the size of the arc door plate is adapted to the area enclosed by the arc edges of the two arc walls. When working, the servo motor drives the rotating shaft, the two sector plates fixed to the rotating shaft and the arc door plate connected to the arc edges of the two sector plates to rotate together in a clockwise direction, so that the arc door plate slowly moves from the side of the high pipe wall to the side of the low pipe wall, so that the bulk material in the hopper always falls against the side of the high pipe wall, so that the falling position of the material remains basically unchanged. Since the falling position of the material remains basically unchanged during the opening of the arc door plate, the shaking of the scale barrel is avoided, which greatly improves the weighing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the blanking mechanism of the packaging scale of the utility model;

[0009] Figure 2 yes Figure 1 AA cross-sectional view of . DETAILED DESCRIPTION

[0010] like Figure 1 and Figure 2As shown, the blanking mechanism of the packaging scale of the utility model comprises a support tube 2 and a box body 12. A hopper and a material discharge door and a servo motor 7 are arranged in the support tube 2. The upper and lower parts of the hopper are respectively a conical part 5 and a special-shaped part. The upper end of the conical part 5 is larger than its lower end, and its upper end is welded to the upper end of the support tube 2 around. The special-shaped part is tubular, and its upper end is rectangular and welded to the lower end of the conical part 5. The pair of tube walls opposite to the special-shaped part are respectively a high tube wall 6 and a low tube wall 10, wherein the vertical height of the high tube wall 6 is much greater than the vertical height of the low tube wall 10. The other pair of tube walls opposite to the special-shaped part are of the same shape and they transition in an arc shape from the lower side of the high tube wall 6 to the lower side of the low tube wall 10 to form an arc wall 9. Shaft seats 4 are fixed on both vertical sides adjacent to the upper end of the high tube wall 6, and a rotating shaft 3 is connected between the two shaft seats 4, and the output shaft of the servo motor 7 is connected to one end of the rotating shaft 3. The unloading door contains two fan-shaped plates 8, which are respectively located outside the two arc-shaped walls 9. Their centers are processed with axial holes and are fixed on the rotating shaft 3 with the help of the axial holes. An arc-shaped door panel 1 is connected between their arc-shaped edges, and the size of the arc-shaped door panel 1 is adapted to the area enclosed by the arc-shaped edges of the two arc-shaped walls 9.

[0011] The box 12 is rectangular, and a through hole 13 is processed on the top thereof to match the lower end of the support tube 2. The lower end of the support tube 2 is fixed around the through hole. A weighing tube 11 is arranged in the box 12, and the mouth of the weighing tube 11 matches the through hole 13.

[0012] During operation, the servo motor 7 drives the rotating shaft 3, the two sector plates 8 fixed to the rotating shaft 3, and the arc door plate 1 connected to the arc edges of the two sector plates 8 to rotate in a clockwise direction, so that the arc door plate 1 slowly moves from one side of the high pipe wall 6 toward one side of the low pipe wall 10, so that the bulk material in the hopper always falls against the side of the high pipe wall 6, so that the falling position of the material remains basically unchanged.

Claims

1. A packaging scale blanking mechanism, comprising a support cylinder (2), wherein a hopper and a blanking door and a servo motor (7) are arranged in the support cylinder (2); the upper and lower parts of the hopper are respectively a conical part (5) and a special-shaped part; the upper end of the conical part (5) is larger than the lower end thereof, and the upper end thereof is connected to the upper end of the support cylinder (2) around; the special-shaped part is tubular, and the upper end thereof is rectangular and connected to the lower end of the conical part (5); the characteristics are: The pair of tube walls opposite to each other in the special-shaped portion are respectively a high tube wall (6) and a low tube wall (10), and the other pair of tube walls opposite to each other have the same shape and are in an arc-shaped transition from the lower edge of the high tube wall (6) to the lower edge of the low tube wall (10) to form an arc-shaped wall (9); shaft seats (4) are provided on both vertical sides adjacent to the upper end of the high tube wall (6), a rotating shaft (3) is provided between the two shaft seats (4), and an output shaft of the servo motor (7) is connected to one end of the rotating shaft (3); the unloading door comprises two fan-shaped plates (8), the two fan-shaped plates (8) are respectively located outside the two arc-shaped walls (9), their centers are fixed on the rotating shaft (3), and an arc-shaped door plate (1) is connected between their arc-shaped edges, and the size of the arc-shaped door plate (1) is adapted to the area enclosed by the arc-shaped edges of the two arc-shaped walls (9).

2. The blanking mechanism of the packaging scale according to claim 1, characterized in that: It also comprises a box body (12), the top of which is provided with a through hole (13) adapted to fit with the lower end of the support cylinder (2); a weighing cylinder (11) is provided inside the box body (12), the mouth of the weighing cylinder (11) being adapted to fit with the through hole (13).

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