Bag taking device of packaging machine

Abstract

The invention provides a bag taking device of a packaging machine, and relates to the technical field of automatic equipment. During bag taking operation, the air cylinder stretches out to push the fixing sleeve to move in the direction away from the fixing base, and the fixing sleeve drives the two ends of the two clamping pieces to synchronously extrude and move towards the middle. When the packaging bag is clamped, the middles of the two clamping pieces are bent outwards at the same time, the middles of the two clamping pieces are opened, the packaging bag is placed between the two clamping pieces, then the air cylinder is contracted, the two clamping pieces are closed towards the middle, the clamping structure of the packaging bag is completed, and after clamping is completed, the air cylinder stretches out, the two clamping pieces are opened at the same time, so that the packaging bag is clamped. And meanwhile, the piston moves outwards in the connecting channel, so that negative pressure is formed in the connecting channel and the adsorption hole, the opening of the packaging bag is sucked through the adsorption hole, the opening of the packaging bag is opened, charging is facilitated, and the functions of clamping and taking the bag and opening the opening of the packaging bag are achieved.

Description

Technical Field

[0001] This invention relates to the field of automation equipment technology, and in particular to a bag-picking device for a packaging machine. Background Technology

[0002] The bag-picking device in a packaging machine is a key component of automated packaging equipment. Its function is to remove stacked or stored packaging bags one by one and open the bag openings to a ready-to-fill state for subsequent material filling processes. Existing bag-picking devices typically employ a combination of a clamping mechanism and a suction cup mechanism. The clamping plates position the packaging bags, and then independently set suction cups or negative pressure components adsorb and pull open the bag openings to achieve the bag-picking and opening functions.

[0003] However, existing bag-removing devices still have shortcomings in practical applications. The clamping mechanism and the adsorption mechanism are usually controlled by independent drive elements, resulting in a complex overall structure, large space occupation, and complex timing coordination between various actions, increasing the debugging difficulty and failure rate of the control system. After the clamping plate clamps the packaging bag, the adsorption mechanism needs to act independently to open the bag opening. This process has a delay, and the positional coordination between the clamping plate and the adsorption mechanism requires high precision; improper coordination can easily lead to insufficient bag opening or the packaging bag falling off. Furthermore, after filling, existing devices usually require an additional unloading mechanism or manual removal of the packaging bag from the clamping mechanism, making it difficult to achieve automatic release of the packaging bag after filling, affecting the overall operating efficiency of the machine. Therefore, a bag-removing device for packaging machines is urgently needed. Summary of the Invention

[0004] To address at least one of the aforementioned technical shortcomings, this invention provides a bag-removing device for a packaging machine, comprising: a clamping plate, the middle of which can be bent outwards; two clamping plates are provided, each clamping plate having a plurality of suction holes on its inner side; a connecting channel being provided inside each clamping plate, the connecting channel communicating with the suction holes; a fixing sleeve being fixedly connected to both ends of the two clamping plates; and two fixing seats, each fixing seat having two limiting rods fixedly connected to one end near the fixing sleeve; a piston being fixedly connected to the end of each limiting rod and sealingly connected to the connecting channel; a spring being fixedly connected between the fixing seat and the fixing sleeve; and a cylinder being fixedly connected to the fixing seat, the output end of which is fixedly connected to the fixing sleeve.

[0005] Furthermore, the mounting base has a spring hole for internal mounting of the spring.

[0006] Furthermore, a bending groove is provided on the outer side of the middle part of the clamping piece.

[0007] Furthermore, clamping plates.

[0008] Furthermore, the length of the limiting rod is greater than the travel distance of the fixed sleeve.

[0009] Furthermore, the adsorption holes are evenly distributed in an array on the inner side of the clamping plate.

[0010] Furthermore, a sealing ring is fitted around the outer periphery of the piston, and the sealing ring is in a sealing fit with the inner wall of the connecting channel.

[0011] Furthermore, the spring is sleeved on the outside of the limiting rod.

[0012] Furthermore, the bending radius of the middle part of the clamping piece is greater than the bending radius of both ends of the clamping piece. Beneficial effects

[0013] During the bag-removal operation, the cylinder extends, pushing the fixing sleeve away from the fixing seat. The fixing sleeve drives the two ends of the two clamping plates to move synchronously towards the center. This causes the middle parts of the two clamping plates to bend outwards simultaneously, opening them up. The packaging bag is then placed between the two clamping plates. The cylinder then retracts, causing the two clamping plates to close inwards, completing the clamping structure for the packaging bag. After clamping, the cylinder extends again, and the two clamping plates open simultaneously. At the same time, the piston moves outwards inside the connecting channel, creating a negative pressure inside the connecting channel and the suction hole. This negative pressure sucks the opening of the packaging bag through the suction hole, opening the bag for easy filling. This invention achieves the functions of clamping and removing the bag and opening the packaging bag.

[0014] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 This is a cross-sectional view of the entire invention.

[0017] Figure 3 This is an isometric view of the fixing sleeve of the present invention.

[0018] Figure 4 This is an isometric view of the mounting base of the present invention.

[0019] exist Figures 1 to 4 The correspondence between the component names or lines and the attached drawing numbers is as follows: clamping plate 1, suction hole 11, connecting channel 12, fixing sleeve 2, cylinder 3, fixing seat 4, limit rod 41, piston 42, spring 5. Detailed Implementation

[0020] Combined with appendix Figures 1 to 4A bag-removing device for a packaging machine includes: a clamping piece 1, the middle of which can be bent outward; two clamping pieces 1 are provided; each clamping piece 1 has several adsorption holes 11 on its inner side; each clamping piece 1 has a connecting channel 12 inside, which communicates with the adsorption holes 11; a fixing sleeve 2 is fixedly connected to both ends of the two clamping pieces 1; and two fixing seats 4 are also included. Each fixing seat 4 has two limiting rods 41 fixedly connected to one end near the fixing sleeve 2; a piston 42 is fixedly connected to the end of each limiting rod 41 and is sealed to the connecting channel 12; a spring 5 is fixedly connected between the fixing seat 4 and the fixing sleeve 2; and a cylinder 3 is fixedly connected to the fixing seat 4, with the output end of the cylinder 3 fixedly connected to the fixing sleeve 2.

[0021] In practical implementation, the bag-picking device of the packaging machine includes two clamping plates 1, which are arranged opposite to each other. Each end of the two clamping plates 1 is fixedly connected to a fixed sleeve 2. Each fixed sleeve 2 is correspondingly provided with a fixed seat 4, on which two limiting rods 41 are fixedly connected. The ends of the two limiting rods 41 extend into the connecting channel 12 of the two clamping plates 1, and are fixedly connected to pistons 42 at their ends. The outer wall of the piston 42 is in sealed contact with the inner wall of the connecting channel 12. A spring 5 is provided between the fixed seat 4 and the fixed sleeve 2, with both ends of the spring 5 abutting against the fixed seat 4 and the fixed sleeve 2 respectively. A cylinder 3 is mounted on the fixed seat 4, and the output end of the cylinder 3 is fixedly connected to the fixed sleeve 2.

[0022] During the bag removal operation, cylinder 3 extends, pushing the fixing sleeve 2 away from the fixing seat 4. The fixing sleeve 2 drives the two ends of the two clamping plates 1 to move synchronously towards the middle. This causes the middle parts of the two clamping plates 1 to bend outwards simultaneously, opening them up. The packaging bag is placed between the two clamping plates 1. Then, cylinder 3 retracts, causing the two clamping plates 1 to close inwards, completing the clamping structure for the packaging bag. After clamping, cylinder 3 extends again, and the two clamping plates 1 open simultaneously. At the same time, piston 42 moves outwards inside the connecting channel 12, creating a negative pressure inside the connecting channel 12 and the suction hole 11. This suction hole 11 then sucks the opening of the packaging bag in place, allowing the bag to be removed. The bag opening is opened to facilitate filling, realizing the functions of clamping and opening the bag. After the bag is filled with the material to be packaged, the bag has a certain weight. Then, the cylinder 3 contracts, causing the two clamping plates 1 to close. At the same time, the piston 42 moves inward inside the connecting channel 12, restoring the normal air pressure inside the connecting channel 12 and the suction hole 11. Under the action of the bag's gravity, the bag filled with the material to be packaged slides down between the two clamping plates 1 and enters the next process below.

[0023] Furthermore, the mounting base 4 has a spring hole for internal mounting of the spring 5.

[0024] In practical implementation, a spring hole is opened on the side of the fixing base 4 facing the fixing sleeve 2. One end of the spring 5 is inserted into the spring hole, and the other end of the spring 5 abuts against the end face of the fixing sleeve 2. The inner diameter of the spring hole matches the outer diameter of the spring 5, so that the spring 5 maintains axial stability during compression and reset, and avoids radial displacement of the spring 5.

[0025] Furthermore, a curved groove is provided on the outer side of the middle part of the clamping piece 1.

[0026] In practical implementation, a bending groove is formed on the outer side of the middle part of the clamping piece 1, extending along the width direction of the clamping piece 1. When both ends of the clamping piece 1 are subjected to tension, the cross-sectional thickness at the location of the bending groove decreases, causing the clamping piece 1 to bend preferentially at that location, and the bending direction is stably facing outward. By setting the bending groove, the bending shape of the middle part of the clamping piece 1 is controllable and the bending position is fixed when under force, avoiding deformation of the clamping piece 1 at unexpected positions, and ensuring that the opening posture of the two clamping pieces 1 is consistent with that of the packaging bag during the bag removal process.

[0027] Furthermore, the length of the position rod 41 is greater than the travel of the fixed sleeve 2.

[0028] In practice, the length of the limiting rod 41 is greater than the maximum travel of the fixed sleeve 2 driven by the cylinder (3). When the fixed sleeve 2 moves to its farthest point, the piston 42 at the end of the limiting rod 41 remains within the connecting channel 12, and the piston 42 does not disengage from the end of the connecting channel 12. This ensures that the piston 42 remains in a sealed connection with the connecting channel 12 during the bending and resetting process of the clamping piece 1, preventing the adsorption function from failing due to the piston 42 disengaging.

[0029] Furthermore, the adsorption holes 11 are evenly arrayed on the inner side of the clamping piece 1.

[0030] In practical implementation, multiple adsorption holes 11 are evenly distributed in a matrix on the inner surface of the clamping plate 1. Each adsorption hole 11 has the same diameter, and the spacing between adjacent adsorption holes 11 is equal. The uniformly distributed array of adsorption holes 11 ensures a more uniform negative pressure distribution when the inner side of the clamping plate 1 contacts the packaging bag, resulting in balanced force on the packaging bag during adsorption and preventing wrinkles or damage caused by excessive local adsorption force.

[0031] Furthermore, a sealing ring is fitted around the outer periphery of the piston 42, and the sealing ring is in a sealing fit with the inner wall of the connecting channel 12.

[0032] In practical implementation, an annular groove is formed on the outer circumference of the piston 42, and a sealing ring is installed in the annular groove. The outer diameter of the sealing ring is larger than the inner diameter of the connecting channel 12, and the sealing ring is interference-fitted with the inner wall of the connecting channel 12. During the movement of the clamping piece 1 driven by the fixed sleeve 2, the sealing ring maintains close contact with the inner wall of the connecting channel 12, preventing external gas from entering the negative pressure area formed between the connecting channel 12 and the piston 42, and ensuring the stability of the negative pressure at the adsorption hole 11.

[0033] Furthermore, the spring 5 is sleeved on the outside of the limiting rod 41.

[0034] In practical implementation, spring 5 is a helical compression spring, which is sleeved on the outer periphery of the limiting rod 41. One end of spring 5 abuts against the end face of the fixed base 4, and the other end of spring 5 abuts against the end face of the fixed sleeve 2. The limiting rod 41 passes through the interior of spring 5 and guides the compression and reset process of spring 5.

[0035] Furthermore, the bending radius of the middle part of the clamping piece 1 is greater than the bending radius of both ends of the clamping piece 1.

[0036] In practical implementation, when the clamping piece 1 is in a free state, its bending radius in the middle is greater than that at both ends, and the overall shape of the clamping piece 1 presents a gradual curve in which the bending degree at both ends is greater than that in the middle. When the two ends of the clamping piece 1 are subjected to tension, the middle part of the clamping piece 1 bends outward. Since the initial bending radius of the middle part is larger, its deformation trend forms a continuous transition with the two ends, making the contact trajectory between the inner surface of the clamping piece 1 and the packaging bag smoother during the bending process. This avoids the formation of local stress concentration on the clamping piece 1 and reduces the risk of fatigue fracture of the clamping piece 1 during long-term use.

Claims

1. A bag-picking device for a packaging machine, comprising: Clamping piece (1); characterized in that: the middle part of the clamping piece (1) can be bent outward, two clamping pieces (1) are provided, and a plurality of adsorption holes (11) are opened on the inner side of the two clamping pieces (1), and a connecting channel (12) is opened inside the two clamping pieces (1), the connecting channel (12) communicates with the adsorption holes (11), and a fixing sleeve (2) is fixedly connected to both ends of the two clamping pieces (1); It also includes two fixed seats (4), each fixed seat (4) has two limiting rods (41) fixedly connected to one end near the fixed sleeve (2), and each limiting rod (41) has a piston (42) fixedly connected to the end of the piston (42) and sealed to the connecting channel (12). A spring (5) is fixedly connected between the fixed seat (4) and the fixed sleeve (2), and a cylinder (3) is fixedly connected to the fixed seat (4). The output end of the cylinder (3) is fixedly connected to the fixed sleeve (2).

2. A bag-picking device for a packaging machine according to claim 1, characterized in that: The mounting base (4) has a spring hole for internally mounting a spring (5).

3. A bag-picking device for a packaging machine according to claim 1, characterized in that: The clamping piece (1) has a curved groove on the outer side of its middle part.

4. A bag-picking device for a packaging machine according to claim 1, characterized in that: The clamping piece (1).

5. A bag-picking device for a packaging machine according to claim 4, characterized in that: The length of the limiting rod (41) is greater than the travel of the fixed sleeve (2).

6. A bag-picking device for a packaging machine according to claim 1, characterized in that: The adsorption holes (11) are evenly distributed in an array on the inner side of the clamping piece (1).

7. A bag-picking device for a packaging machine according to claim 1, characterized in that: The piston (42) is fitted with a sealing ring on its outer periphery, and the sealing ring is sealed to the inner wall of the connecting channel (12).

8. A bag-picking device for a packaging machine according to claim 1, characterized in that: The spring (5) is sleeved on the outside of the limiting rod (41).

9. A bag-picking device for a packaging machine according to claim 1, characterized in that: The bending radius of the middle part of the clamping piece (1) is greater than the bending radius of both ends of the clamping piece (1).

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