A bag breaking knife structure of an unpacking machine
Patent Information
- Application Number
- CN202522506489.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-11-26
AI Technical Summary
[0003]现有的拆袋装置中如图1至图3所示，现有割刀20通过连接板4随着移动机构刺向吨袋10，吨袋10被现有割刀20割破后会形成被割部分101，被割部分101会被现有割刀20完全割掉与吨袋10分离从而落入粉料中，现有割刀20的锥形圆环201与吨袋10的接触面积较大，不容易刺破；这种由整体圆形刀片直接插入吨袋10破袋，由于锥形圆环201与吨袋10接触面积大不能更好的破开吨袋10，而且破袋过深会导致有过多扬尘泄漏到外部环境中，时间久了，造成外部环境污染，需要及时清理；对于一些特殊有刺激性危害健康的粉体如果泄漏到外部环境中还会对操作人员身体健康造成损害
本实用新型将原有的满圆刀口设计为约三分之二至四分之三周长的锥形锯齿部，并在锥形锯齿部设置了多个锯齿。这种设计极大地减少了刀口与吨袋的初始接触面积，使刺破更为轻松、迅速，有效降低了破袋所需的推力，避免了吨袋打滑或推挤；具有锯齿的尖部在刺破吨袋时阻力小、所需推力小，破袋更高效。
Smart Images
Figure CN224857273U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bag-breaking knife technology for unpacking machines, and in particular to a structure for a bag-breaking knife for unpacking machines. Background Technology
[0002] In many industries such as pharmaceuticals, food, and chemicals, powder unpacking operations are required. During the unpacking process, there will inevitably be situations where the unpacking is not smooth or airtight. In environments with dust exposure, even if dust is controlled, it is still unavoidable for dust to leak into the external environment. Over time, this will cause environmental pollution, requiring timely cleanup and increasing the company's costs. For some special powders that are irritating and harmful to health, leakage into the external environment can also harm the health of operators.
[0003] In existing bag-opening devices, such as Figures 1 to 3 As shown, the existing cutter 20, via the connecting plate 4 and the moving mechanism, pierces the ton bag 10. After the ton bag 10 is cut by the existing cutter 20, a cut portion 101 is formed. The cut portion 101 is completely cut off by the existing cutter 20 and separates from the ton bag 10, falling into the powder. The conical ring 201 of the existing cutter 20 has a large contact area with the ton bag 10, making it difficult to pierce. This method of directly inserting a whole circular blade into the ton bag 10 to break it has limitations. Due to the large contact area between the conical ring 201 and the ton bag 10, it cannot effectively break the ton bag 10. Moreover, breaking the bag too deeply can lead to excessive dust leakage into the external environment, causing environmental pollution over time and requiring timely cleanup. For some special irritating and health-hazardous powders, leakage into the external environment can also harm the health of operators. At the same time, the depth of insertion of the existing cutter 20 into the ton bag 10 cannot be freely controlled. With different ton bags of different sizes, the insertion depth into the ton bag 10 is prone to being too deep or too shallow.
[0004] Therefore, there is an urgent need in this field for a bag-breaking knife structure that has low resistance to breaking bags and can adapt to different ton bag sizes. Utility Model Content
[0005] The purpose of this invention is to provide a bag-breaking knife structure that has low resistance to bag breaking and can adapt to different ton bag sizes.
[0006] To achieve the above objectives, this utility model adopts the following technical solution: a bag-breaking knife structure for unpacking a powder ton bag, comprising a cylinder, a cylinder mounting seat for mounting the cylinder, a transition plate slidably connected to the cylinder mounting seat, a connecting plate connected to the transition plate, and a bag-breaking knife connected to the connecting plate; the cylinder mounting seat includes a central part of the mounting seat, a first side plate of the mounting seat, and a second side plate of the mounting seat, and the cylinder is mounted on the central part of the mounting seat; the piston rod of the cylinder is connected to the connecting plate through the transition plate; the bag-breaking knife is fixedly mounted on the connecting plate; the cutting edge of the bag-breaking knife is... The ring is incomplete, with two-thirds to three-quarters of its circumference being a conical serrated section, which serves as the working cutting edge and has multiple serrations. The remaining quarter to one-third of the circumference is the unused cutting edge, which is not the working cutting edge. A first guide rod and a second guide rod are fixed on the adapter plate. The other ends of the first guide rod and the second guide rod pass through the first guide hole on the first side plate of the mounting base and the second guide hole on the second side plate of the mounting base, respectively. The first guide rod and the second guide rod are located on both sides of the cylinder body.
[0007] Preferably, the first side plate and the second side plate of the mounting base are arranged in parallel opposite directions, the middle part of the mounting base, the first side plate and the second side plate of the mounting base are an H-shaped integral molding structure, and the first guide hole and the second guide hole are optical holes for providing linear guidance for the first guide rod and the second guide rod.
[0008] Preferably, the adapter plate and the connecting plate are detachably connected by bolts.
[0009] Preferably, it also includes a dust cover, which is installed on the cylinder mounting base, and the dust cover is partially sleeved on the outside of the first guide rod and the second guide rod on both sides of the cylinder.
[0010] Preferably, the conical serrated part of the bag-breaking knife is two-thirds of the circumference of the blade edge, and the unused part of the blade edge is one-third of the circumference of the blade edge.
[0011] Preferably, the remaining portion of the cutting edge is in the shape of a groove, the length of the opening side of the groove is greater than the length of the opposite side, and the height of the groove is greater than the height of the saw tooth.
[0012] Preferably, the apex angle of the saw teeth is 30-45°, and the included angle between adjacent saw teeth 53 is 30-45°.
[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This invention replaces the original full-circle blade with a conical serrated section approximately two-thirds to three-quarters of its circumference, and incorporates multiple serrations within this conical section. This design significantly reduces the initial contact area between the blade and the ton bag, making piercing easier and faster, effectively reducing the thrust required to break the bag, and preventing the ton bag from slipping or being pushed. The serrated tip provides less resistance and requires less thrust when piercing the ton bag, resulting in more efficient bag breaking.
[0014] The serrated blade cuts the bag more cleanly, creating a neat incision rather than a rough tear. Combined with the design of the unused portion of the blade, it reduces overall disturbance to the bag during the rupture process, thus reducing dust generation. Furthermore, the cut portion of the ton bag remains connected to the main body and will not fall into the powder. This lowers the risk of dust leakage into the external environment, resulting in effective dust control and minimal environmental pollution.
[0015] Driven by a cylinder and guided by a first and second guide rod, the cutting depth of the bag-breaking knife can be controlled. Users can flexibly adjust the cylinder stroke according to the size and material of the ton bags to ensure that a break is made of the appropriate size and in the optimal position. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of an existing cutting tool in the prior art; Figure 2 This is a schematic diagram of a conventional cutter cutting through a ton bag in the prior art. Figure 3 This is a cross-sectional schematic diagram of a conventional cutter cutting through a ton bag in the prior art; Figure 4 This is a three-dimensional structural diagram of the bag-breaking knife proposed in this utility model; Figure 5 This is a front view of the bag-breaking knife proposed in this utility model; Figure 6 This is a schematic diagram of the bag-breaking knife of this utility model cutting open a ton bag; Figure 7 for Figure 6 Cross-sectional schematic diagram; Figure 8 This is a three-dimensional structural diagram of the bag-breaking knife structure of the unpacking machine proposed in this utility model; Figure 9 This is a front view of the bag-breaking knife structure of the unpacking machine proposed in this utility model; Figure 10 This is a schematic diagram showing the connection between the cylinder mounting base and the cylinder in the bag-breaking knife structure of the unpacking machine proposed in this utility model; Figure 11 for Figure 10 Cross-sectional schematic diagram; Explanation of reference numerals in the attached drawings: 10, Ton bag; 101, Part to be cut; 102, Adhesive part; 20, Existing cutter; 201, Conical ring; 1, Cylinder; 11, Piston rod; 2, Cylinder mounting base; 21, Center of mounting base; 22, First side plate of mounting base; 221, First guide hole; 23, Second side plate of mounting base; 231, Second guide hole; 3, Adapter plate; 4, Connecting plate; 5, Bag-breaking knife; 51, Empty part of the blade; 52, Conical serrated part; 53, Serrated tooth; 54, Hollow part; 6, Dust cover; 7, First guide rod; 8, Second guide rod. Detailed Implementation
[0017] As described in the background section, in the unpacking of powders in the pharmaceutical, food, and chemical industries, existing technologies generally suffer from problems such as uneven and incomplete bag opening. Figures 1 to 3 The existing bag-opening device shown uses a cutter 20 that is a complete conical ring 201. This structure has high resistance to bag breaking. The complete conical ring 201 has a large contact area with the ton bag 10, requiring a large initial puncture force, making it difficult to cut into the bag body smoothly. This often leads to failure in the bag breaking action or the bag body being pushed and deformed. The integral circular blade is directly inserted into the bag to break it, resulting in a harsh cutting method that easily causes irregular tearing of the bag body, producing a large cut portion 101 that completely falls into the material. This process is very likely to cause material contamination. The existing structure cannot flexibly adjust the bag breaking depth. When dealing with ton bags of different sizes and filling volumes, the fixed bag breaking stroke cannot achieve the optimal bag breaking effect. If the opening is too small, it will lead to poor material discharge; if it is too deep, it will increase dust.
[0018] To solve the above problems, the unpacking machine bag-breaking knife structure provided by this utility model includes two parts: a knife and a cylinder. The cylinder can be adjusted to different extension lengths to adapt to different sizes of ton bags. The knife structure has been changed from the original full-circle blade to a partial cutting edge, with the remaining part being an empty structure. The cutting edge is serrated, which reduces the force-bearing area of the ton bag and makes it easier to cut the ton bag. The stroke of the cylinder is adjusted according to the different sizes of the ton bags, and the cylinder drives the knife to perform the unpacking action.
[0019] like Figure 4 , Figure 5 The diagram shows the bag-breaking knife 5 used in the bag-breaking knife structure of the unpacking machine of this utility model. The cutting edge of the bag-breaking knife 5 is an incomplete ring shape, with a hollow part 54 inside. Two-thirds to three-quarters of the circumference of the cutting edge of the bag-breaking knife 5 is a conical serrated part 52, which serves as the working cutting edge to pierce into the ton bag 10. The conical serrated part 52 is provided with multiple serrations 53, and the remaining one-quarter to one-third of the circumference is the unused part 51 of the cutting edge, which is a non-working cutting edge. Preferably, the conical serrated part 52 of the bag-breaking knife 5 is two-thirds of the circumference of the cutting edge of the bag-breaking knife 5, and the unused part 51 is one-third of the circumference of the cutting edge of the bag-breaking knife 5. Figure 5 As shown, the empty portion 51 of the cutting edge is in the shape of a groove, which is approximately trapezoidal. The length b of the groove shape near the opening of the serration 53 is greater than the length a of the side away from the serration 53, and the height H of the groove shape is greater than the height h of the serration 53. The height H of the groove shape is generally 5-10cm, and the height h of the serration 53 is 2-5cm.
[0020] The apex angle β of the serration 53 is 30-45°, and the included angle α between adjacent serrations 53 is 30-45°. If the angle is too large, it will be difficult to penetrate; if the angle is too small, the serration 53 will be weak and not durable. The 30-45° angle is determined based on processing experience to balance durability and ease of penetration. Preferably, the apex angle β of the serration 53 is equal to the included angle α between adjacent serrations 53.
[0021] Figure 6 , Figure 7 This diagram illustrates the insertion of the bag-breaking knife 5 into the ton bag 10. Only the portion of the remaining blade 51 near the serrations 53 enters the ton bag 10; the portion further away from the serrations 53 remains outside the ton bag 10. In other words, the upper bottom portion of the remaining blade 51 does not cut through the corresponding part of the ton bag 10. Figure 5 The portion of length a on the side furthest from the serration 53 remains outside the ton bag 10 and does not participate in puncturing the ton bag 10. Figure 7 In the process, after the serration 53 punctures the ton bag 10, the conical serration 52 extends completely into the ton bag 10, and the unpunctured part of the blade 51 forms an adhesive part 102; the adhesive part 102 always follows the ton bag 10 during the material dropping process and will not be mixed into the material.
[0022] In traditional unpacking machines, the cutting blade 20 moves by directly piercing the ton bag, resulting in a uniform piercing depth. To accommodate different ton bags requiring varying piercing depths, this invention utilizes a cylinder within the unpacking machine to further move the piercing blade 5. For details, please refer to [link / reference]. Figure 8 , Figure 9 As shown, the system includes a cylinder 1, a cylinder mounting base 2 for mounting the cylinder 1, the cylinder mounting base 2 being connected to the unpacking machine and movable with the unpacking machine; one end of an adapter plate 3 is slidably connected relative to the cylinder mounting base 2, and the other end of the adapter plate 3 is detachably connected to a connecting plate 4, specifically the adapter plate 3 and the connecting plate 4 being detachably connected by bolts; the connecting plate 4 connects to a bag-breaking knife 5; the piston rod 11 of the cylinder 1 is connected to the connecting plate 4 through the adapter plate 3; the side of the bag-breaking knife 5 is fixedly mounted on the connecting plate 4; a first guide rod 7 and a second guide rod 8 are fixed on the adapter plate 3. It also includes a dust cover 6, which is used to shield the guide rod mechanism and prevent dust from entering; the dust cover 6 is mounted on the cylinder mounting base 2, and the dust cover 6 is partially fitted over the first guide rod 7 and the second guide rod 8 on both sides of the cylinder 1.
[0023] Figure 10 , Figure 11 As shown, the cylinder mounting base 2 includes a central mounting base 21, a first side plate 22, and a second side plate 23. The cylinder 1 is mounted on the central mounting base 21. The piston rod 11 of the cylinder 1 passes through the central mounting base 21 and connects to the center of the adapter plate 3. The other ends of the first guide rod 7 and the second guide rod 8 pass through the first guide hole 221 on the first side plate 22 and the second guide hole 231 on the second side plate 23, respectively. The first guide rod 7 and the second guide rod 8 are located on both sides of the cylinder body of the cylinder 1. The first side plate 22 and the second side plate 23 of the mounting base are arranged in parallel opposite directions. The central mounting base 21, the first side plate 22, and the second side plate 23 are an H-shaped integrally formed structure. The first guide hole 221 and the second guide hole 231 are light holes for providing linear guidance for the first guide rod 7 and the second guide rod 8.
[0024] In use, the bag-breaking knife structure of this utility model's unpacking machine mainly includes a cylinder 1, a cylinder mounting base 2, an adapter plate 3, a connecting plate 4, a bag-breaking knife 5, a dust cover 6, a first guide rod 7, and a second guide rod 8. The stroke of the cylinder 1 is pre-adjusted according to the size and material of the ton bag 10 to be broken, to control the cutting depth of the bag-breaking knife 5. When the unpacking machine is started and moved to the predetermined position, the piston rod 11 of the cylinder 1 pushes the adapter plate 3 forward in a straight line along the first guide rod 7 and the second guide rod 8, driving the bag-breaking knife 5 to pierce the ton bag 10 through the connecting plate 4. The serrations 53 on the conical serrated part 52 of the bag-breaking knife 5 first contact the ton bag 10. Due to the design of the serrations 53, the initial contact area is reduced, and stress is concentrated, making piercing easy and quick. The remaining part 51 of the blade only partially enters the ton bag, and the unpierced part of the ton bag forms an adhesive part 102, ensuring that the adhesive part 102 remains connected to the main body of the ton bag and will not fall into the powder. Once the predetermined bag-breaking depth is reached, cylinder 1 retracts the bag-breaking knife 5, completing one bag-opening operation. The entire process generates minimal dust, produces clean cuts, and is adaptable to different ton bag sizes.
[0025] In summary, this utility model provides a highly efficient, environmentally friendly, and adaptable bag-breaking knife structure for unpacking machines. By optimizing the structure of the bag-breaking knife 5 from a traditional complete circular ring to a non-closed ring with a blade edge 51 and a conical serrated section 52, the serrated design concentrates stress and reduces the contact area, making the bag-breaking action resemble slicing rather than tearing, fundamentally improving the smoothness and regularity of the bag-breaking process. Power is provided by a cylinder 1, and the guide rod passing through the first guide hole 221 and the second guide hole 231 ensures motion accuracy, achieving adjustable and controllable bag-breaking depth, adaptable to various ton bag sizes. The extension stroke of the cylinder 1 is preset according to the size of the ton bag to be broken; after startup, the cylinder pushes the bag-breaking knife 5 precisely forward along the guide rod through the adapter plate 3 and connecting plate 4, smoothly slicing open the ton bag with its serrated edge, and then retracting after reaching the predetermined depth. The remaining portion 51 with the cutting edge will not rupture the ton bag 10, ensuring that the cut portion 101 remains adhered to the ton bag 10 and does not fall into the powder as in existing technologies. This structure effectively solves the problems of high resistance, high dust generation, and poor adaptability in traditional bag-breaking methods.
Claims
1. A bag-breaking knife structure for an unpacking machine, used to break open ton bags of powder, characterized in that: The system includes a cylinder (1), a cylinder mounting base (2) for mounting the cylinder (1), a transition plate (3) slidably connected to the cylinder mounting base (2), a connecting plate (4) connected to the transition plate (3), and a bag-breaking knife (5) connected to the connecting plate (4); the cylinder mounting base (2) includes a central part (21), a first side plate (22), and a second side plate (23), and the cylinder (1) is mounted on the central part (21); the piston rod of the cylinder (1) is connected to the connecting plate (4) through the transition plate (3); the bag-breaking knife (5) is fixedly mounted on the connecting plate (4); the cutting edge of the bag-breaking knife (5) is an incomplete ring, of which two-thirds to three-quarters of the circumference area is... The conical sawtooth section (52) serves as the working cutting edge. Multiple sawtooths (53) are provided on the conical sawtooth section (52). The remaining quarter to one-third of the circumference is the unused cutting edge (51), which is a non-working cutting edge. A first guide rod (7) and a second guide rod (8) are fixed on the adapter plate (3). The other ends of the first guide rod (7) and the second guide rod (8) pass through the first guide hole (221) on the first side plate (22) of the mounting base and the second guide hole (231) on the second side plate (23) of the mounting base, respectively. The first guide rod (7) and the second guide rod (8) are located on both sides of the cylinder body of the cylinder (1).
2. The bag-breaking knife structure of the unpacking machine according to claim 1, characterized in that: The first side plate (22) and the second side plate (23) of the mounting base are arranged in parallel opposite directions. The middle part (21) of the mounting base, the first side plate (22) and the second side plate (23) of the mounting base are an H-shaped integral structure. The first guide hole (221) and the second guide hole (231) are light holes used to provide linear guidance for the first guide rod (7) and the second guide rod (8).
3. The bag-breaking knife structure of the unpacking machine according to claim 1, characterized in that: The adapter plate (3) and the connecting plate (4) are detachably connected by bolts.
4. The bag-breaking knife structure of the unpacking machine according to claim 1, characterized in that: It also includes a dust cover (6), which is installed on the cylinder mounting base (2), and the dust cover (6) is partially sleeved on the outside of the first guide rod (7) and the second guide rod (8) on both sides of the cylinder (1).
5. The unpacking machine bag-breaking knife structure according to claim 1, characterized in that: The conical serrated part (52) of the bag-breaking knife (5) is two-thirds of the circumference of the cutting edge of the bag-breaking knife (5), and the empty part of the cutting edge (51) is one-third of the circumference of the cutting edge of the bag-breaking knife (5).
6. The bag-breaking knife structure of the unpacking machine according to claim 1, characterized in that: The empty part of the blade (51) is in the shape of a groove. The length of the opening side of the groove is greater than the length of the opposite side, and the height of the groove is greater than the height of the serration (53).
7. The unpacking machine bag-breaking knife structure according to claim 1, characterized in that: The apex angle of the saw teeth (53) is 30-45°, and the included angle between adjacent saw teeth (53) is 30-45°.