Empty bag sorting device capable of preventing bag connection during bag taking

Abstract

An empty bag sorting device capable of preventing bag connection during bag taking belongs to the field of packaging machinery and comprises a support, a rack is arranged in the middle of the support, the front portion of the rack is hinged to the corner of a sickle-shaped first rocker, the short rod end of the first rocker is hinged to a cylinder rod of a bag taking air cylinder, and a cylinder body of the bag taking air cylinder is hinged to the upper portion of the front end of the support. The rear portion of the machine frame is hinged to the upper portion of a second rocker, the lower portion of the second rocker is hinged to the middle of a short rod of the sickle-shaped connecting rod, the machine frame, the first rocker, the second rocker and the connecting rod form a plane four-bar mechanism, and a bag taking suction cup is arranged on the lower portion of the long rod of the connecting rod. In the process that the bag taking suction cup lifts the empty bags upwards, the included angle between the lower end face of the bag taking suction cup and the horizontal plane tends to be continuously expanded and enlarged. According to the bag taking suction cup, the included angle between the lower end face of the suction cup and the horizontal plane is continuously expanded and enlarged in the process that empty bags are lifted upwards, the adhesion state between the upper empty bag and the lower empty bag is broken, and the success rate of empty bag sorting is increased.

Description

Technical Field

[0001] This utility model relates to an empty bag sorting device that prevents bags from sticking together, and belongs to the field of packaging machinery. Background Technology

[0002] In high-speed packaging of powdery and granular materials such as fertilizers and salts, pre-made bags are often used. After initial production and transportation, these pre-made bags are prone to static electricity and negative pressure between the upper and lower empty bags. When the automatic packaging machine's bag-picking suction cup sorts the empty bags individually, it frequently results in two empty bags being picked up at once. The two bags, stuck together, are simultaneously sent to the bag opening position, causing bag opening failure and reducing the efficiency of the automatic packaging machine. Patent document CN217945712U discloses an empty bag sorting device for preventing bag sticking, which utilizes a bag-picking suction cup... After the tray descends vertically to pick up an empty bag, it returns to its original position. During the return, the edge of one side of the bag scrapes against the vertically arranged transverse toothed separating plate, causing the bag edge to be impacted downwards and separating the bag that is stuck together. However, because this type of bag-picking suction cup moves in a straight line during the upward return process, the two empty bags remain stuck together under negative pressure after picking up two bags. Scraping one side of the bag edge can only slightly separate one edge of the two stuck empty bags, and may even tear the bag. Therefore, this device is difficult to completely separate two stuck empty bags, making it difficult to guarantee the reliability of empty bag sorting. Utility Model Content

[0003] To address the problem of existing empty bag sorting devices prone to bag sticking, this invention proposes an empty bag sorting device with anti-sticking features. It includes a support, the lower end of which is connected to an external frame. A frame is located in the middle of the support. The front of the frame is hinged to the corner of a sickle-shaped first rocker arm. The short end of the first rocker arm is hinged to the cylinder rod of a bag-picking cylinder. The cylinder body of the bag-picking cylinder is hinged to the upper front end of the support. The long end of the first rocker arm is hinged to the short end of a sickle-shaped connecting rod. The rear part of the frame is hinged to the upper part of the second rocker arm, and the lower part of the second rocker arm is hinged to the middle of the short rod of the connecting rod. The frame, the first rocker arm, the second rocker arm, and the connecting rod form a planar four-bar linkage mechanism. The lower part of the long rod of the connecting rod is provided with a bag-retrieving suction cup. When the bag-retrieving cylinder drives the planar four-bar linkage mechanism, the lower end face of the bag-retrieving suction cup can be adjusted to fit against the upper surface of the empty bag when the bag-retrieving suction cup is in a low position. During the process of lifting the empty bag upward, the angle between the lower end face of the bag-retrieving suction cup and the horizontal plane tends to continuously widen and increase.

[0004] The front part of the frame is hinged to the corner of the first rocker arm to form a first revolute joint; the rear part of the frame is hinged to the upper part of the second rocker arm to form a second revolute joint; the lower part of the second rocker arm is hinged to the middle part of the short rod of the connecting rod to form a third revolute joint; and the end of the long rod of the first rocker arm is hinged to the end of the short rod of the connecting rod to form a fourth revolute joint. The frame length between the first and second revolute joints is slightly greater than the connecting rod length between the third and fourth revolute joints, and the length of the first rocker arm between the first and fourth revolute joints is slightly less than the length of the second rocker arm between the second and third revolute joints.

[0005] The beneficial effects of this utility model are:

[0006] A. By utilizing a planar four-bar linkage with a specific length relationship, the angle between the lower end face of the suction cup and the horizontal plane continuously widens as the empty bag is lifted upwards. This creates a triangular gap between the ends of the upper and lower empty bags, thereby breaking the negative pressure and electrostatic adhesion between the upper and lower empty bags. This ensures that the empty bags do not stick together, eliminates the problem of empty bag adhesion, improves the success rate of empty bag sorting, and enhances the reliability of the device.

[0007] B. By utilizing a planar four-bar linkage with a specific length relationship, the bag-picking suction cup moves upward and backward a certain distance at the same time, achieving the separation effect of tearing the upper and lower empty bags apart, thereby avoiding the problem of empty bags sticking together and further improving the reliability of empty bag sorting. Attached Figure Description

[0008] Figure 1 This is a three-dimensional isometric view of this utility model.

[0009] Figure 2 This is the front view of this utility model.

[0010] Figure 3 This is a schematic diagram of the motion trajectory of this utility model.

[0011] Figure 4 This is a simplified structural diagram of the planar four-bar linkage of this utility model.

[0012] Figure 5 This is a schematic diagram showing the state of an empty bag as it is lifted upwards.

[0013] Figure 6 This is a schematic diagram showing the state of the empty bag when it is lifted into place. Detailed Implementation

[0014] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the embodiments of this utility model are described in detail below with reference to the accompanying drawings. The embodiments are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0015] See Figures 1-3 An empty bag sorting device with anti-bag-sticking function includes a support 1, the lower end of which is connected to an external frame. A frame 3 is located in the middle of the support 1. The front part of the frame 3 is hinged to the corner of a sickle-shaped first rocker arm 2. The short end of the first rocker arm 2 is hinged to the cylinder rod of a bag-picking cylinder 6. The cylinder body of the bag-picking cylinder 6 is hinged to the upper front end of the support 1. The long end of the first rocker arm 2 is hinged to the short end of a sickle-shaped connecting rod 5. The rear part of the frame 3 is hinged to the upper part of a second rocker arm 4. Next, the lower part of the second rocker arm 4 is hinged to the middle of the short rod of the connecting rod 5. The frame 3, the first rocker arm 2, the second rocker arm 4, and the connecting rod 5 form a planar four-bar linkage mechanism. The lower part of the long rod of the connecting rod 5 is provided with a bag-retrieving suction cup 7. When the bag-retrieving cylinder 6 drives the planar four-bar linkage mechanism, the lower end face of the bag-retrieving suction cup 7 can be adjusted to fit against the upper surface of the empty bag K when it is in a low position. During the process of lifting the empty bag K upward, the angle between the lower end face of the bag-retrieving suction cup 7 and the horizontal plane tends to continuously widen and increase.

[0016] Preferably, the planar four-bar linkage is a double-sided planar four-bar linkage.

[0017] Further, see Figures 3-6 The front part of the frame 3 is hinged to the corner of the first rocker arm 2 as a first revolute joint A. The rear part of the frame 3 is hinged to the upper part of the second rocker arm 4 as a second revolute joint B. The lower part of the second rocker arm 4 is hinged to the middle part of the short rod of the connecting rod 5 as a third revolute joint C. The end of the long rod of the first rocker arm 2 is hinged to the end of the short rod of the connecting rod 5 as a fourth revolute joint D. The length of the frame 3 between the first revolute joint A and the second revolute joint B is slightly greater than the length of the connecting rod 5 between the third revolute joint C and the fourth revolute joint D. The length of the first rocker arm 2 between the first revolute joint A and the fourth revolute joint D is slightly less than the length of the second rocker arm 4 between the second revolute joint B and the third revolute joint C. The bag-retrieving cylinder 4 drives the planar four-bar linkage mechanism to move the bag-retrieving suction cup 7 upward while moving the empty bag K backward by a certain distance, so that the upper and lower empty bags can be torn apart.

Claims

1. A bag picking and anti-bagging empty bag sorting device comprising a support (1), the lower end of which is connected to an external frame, characterized in that: The middle part of the support (1) is provided with a frame (3), the front part of the frame (3) is hinged with the corner of the first rocker (2) of sickle type, the short rod end of the first rocker (2) is hinged with the cylinder rod of the bag taking cylinder (6), the cylinder body of the bag taking cylinder (6) is hinged on the upper part of the front end of the support (1), the long rod end of the first rocker (2) is hinged with the short rod end of the sickle type connecting rod (5), the rear part of the frame (3) is hinged with the upper part of the second rocker (4), the lower part of the second rocker (4) is hinged with the middle part of the short rod of the connecting rod (5), the frame (3), the first rocker (2), the second rocker (4) and the connecting rod (5) form a planar four-bar linkage, the lower part of the long rod of the connecting rod (5) is provided with a bag taking suction cup (7), the bag taking cylinder (6) drives the planar four-bar linkage to make the lower end surface of the bag taking suction cup (7) adjustable to be attached to the upper surface of the empty bag (K) when the bag taking suction cup (7) is in the low position, the included angle between the lower end surface of the bag taking suction cup (7) and the horizontal plane shows a trend of continuously opening and increasing during the process of the bag taking suction cup (7) lifting the empty bag (K) upward.

2. The bag picking and anti-bagging empty bag sorting device according to claim 1, characterized in that: The front part of the frame (3) is hinged with the corner of the first rocker (2) as the first turning pair (A), the rear part of the frame (3) is hinged with the upper part of the second rocker (4) as the second turning pair (B), the lower part of the second rocker (4) is hinged with the middle part of the short rod of the connecting rod (5) as the third turning pair (C), the long rod end of the first rocker (2) is hinged with the short rod end of the connecting rod (5) as the fourth turning pair (D), the length of the frame (3) between the first turning pair (A) and the second turning pair (B) is slightly larger than the length of the connecting rod (5) between the third turning pair (C) and the fourth turning pair (D), the length of the first rocker (2) between the first turning pair (A) and the fourth turning pair (D) is slightly smaller than the length of the second rocker (4) between the second turning pair (B) and the third turning pair (C).

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