High-precision dust-free ton bag packaging machine

Abstract

A high-precision dust-free ton bag packing machine, which comprises a fixed platform. Four weighing sensors are arranged on the upper end surface of the fixed platform. The upper end surface of the weighing sensor is connected to a weighing frame. A counterweight is provided on the weighing frame. Lifting motors are arranged at the diagonal positions of the counterweight. Winding wheels are arranged at both ends of the lifting main shaft. Driven wheels are also arranged at positions corresponding to the winding wheels. One ends of a short traction belt and a long traction belt are stacked and fixed on the winding wheel. The other end of the short traction belt extends downward after passing through the winding wheel. The other end of the long traction belt extends downward after passing through the driven wheel. A lifting guide frame is arranged on one side of the weighing frame. A fixed blanking cylinder is also arranged on the fixed platform. A bag clamping and hanging device is arranged directly below the fixed blanking cylinder. The upper end of the bag clamping and hanging device is connected to the ends of the short traction belt and the long traction belt. A guide wheel group is arranged on one side of the bag clamping and hanging device. The guide wheel group moves up and down along the lifting guide frame. The present invention can adapt to various ton bag height dimensions and can improve the weighing accuracy at the same time.

Description

Technical Field

[0001] The present invention discloses a high-precision dust-free ton bag packaging machine, belonging to the field of packaging machinery. Background Art

[0002] Patent document CN108454904A discloses a motor-integrated lifting ton bag packaging machine, which can adapt to ton bags of different height dimensions and can realize the up and down tamping actions of the ton bags. However, this technical solution has two problems: First, the weighing sensors are installed on the lifting frame, and the lifting frame is driven by a chain to move up and down, resulting in poor repeatability of the levelness of the lifting frame. Moreover, the chain will be continuously stretched after long-term operation, causing the levelness of the lifting frame to change continuously. Since the installation reference planes of the four weighing sensors cannot maintain a horizontal level but have random changes, the weighing error is relatively large. Second, the upper end of the bag clamping device is connected to the upper fixed feeding cylinder through a telescopic bellows. When in the weighing and bagging position, the pulling force of the bellows on the bag clamping device also has poor repeatability, resulting in weighing errors. In addition, dust is likely to accumulate inside and outside the bellows. These accumulated dusts are likely to corrode the bellows, and at the same time, the dust will randomly fall onto the equipment below, causing environmental pollution.

[0003] Patent document CN215399420U discloses an airbag type ton bag packaging machine with a metering function. Its weighing sensors are installed on a fixed bracket, which can well ensure the levelness of the installation reference plane of the weighing sensors and improve the weighing accuracy of the packaging machine. However, this technical solution also has two problems: First, the ton bag hanging frame is driven by a cylinder to move up and down, and the stroke of the cylinder cannot be too long. Therefore, this solution cannot adapt to the change of the height dimensions of different ton bags. Second, a flexible connection is used between the airbag device and the feeding pipe, which also has problems of affecting the weighing accuracy and dust falling.

[0004] Another common problem of the current ton bag packaging machines for packaging powder materials is that after the weighing and packaging are completed, the residual materials and dust in the feeding cylinder will fall down from the bag clamping and feeding port to the equipment below, causing environmental pollution and equipment corrosion, because there is no gate mechanism at the feeding port of the bag clamping device to avoid this situation. Summary of the Invention

[0005] In order to solve the problems of poor weighing accuracy and dust falling and polluting the environment existing in the existing ton bag packing machines, the present invention proposes a high-precision dust-free ton bag packing machine, which includes a fixed platform 1. Four weighing sensors 2 are arranged on the upper end surface of the fixed platform 1. The upper end surface of the weighing sensor 2 is connected to a weighing frame 3. The weighing frame 3 includes a bearing frame body 31. A counterweight 32 is arranged at one corner of the bearing frame body 31. The weight and installation position of the counterweight 32 are adjustable. The counterweight 32 makes the horizontal center of gravity of the weighing frame 3 after bearing all mechanisms coincide with the horizontal center of the four weighing sensors 2. A lifting motor 36 is arranged at the diagonal position of the counterweight 32. The lifting motor 36 is connected to a lifting main shaft 35 through a chain. Winding wheels 34 are arranged at both ends of the lifting main shaft 35. At the corresponding position of the bearing frame body 31 parallel to the lifting main shaft 35 and on the other side, a driven wheel 38 is also arranged. One end of a short drag belt 37 and a long drag belt 33 are stacked and fixed on the winding wheel 34. The other end of the short drag belt 37 extends vertically downward after passing through the winding wheel 34. The other end of the long drag belt 33 extends vertically downward after passing through the driven wheel 38. A lifting guide frame 6 is arranged on one side of the weighing frame 3. A fixed blanking cylinder 4 is also arranged on the fixed platform 1. The vertical center line of the fixed blanking cylinder 4 coincides with the vertical center lines of the four weighing sensors 2. A bag clamping and hanging device 5 is arranged directly below the fixed blanking cylinder 4. The upper end of the bag clamping and hanging device 5 is connected to the ends of the short drag belt 37 and the long drag belt 33 extending vertically downward. A guide wheel group 54 is arranged on one side of the bag clamping and hanging device 5. The guide wheel group 54 moves up and down along the lifting guide frame 6.

[0006] The fixed blanking cylinder 4 includes a cylinder body 41. A gate cylinder 44 is arranged on the upper part of the cylinder body 41. The cylinder rod of the gate cylinder 44 is hinged to the rear end of a swing fork 42. The middle part of the swing fork 42 is hinged to the outer wall of the cylinder body 41. The two fork ends at the front part of the swing fork 42 are respectively hinged to the upper ends of the gate pull rods 43 vertically arranged on both sides of the cylinder body 41. The lower ends of the gate pull rods 43 are hinged to the upper middle part of a spherical gate 46. The left and right ends of the spherical gate 46 are both hinged to the outer wall of the cylinder body 41. When the two spherical gates 46 are closed, the lower end outlet of the cylinder body 41 can be completely closed. A sealing cap 45 with a closed upper end is also arranged on the outer side of the middle part of the cylinder body 41.

[0007] The bag clamping and hanging device 5 includes a hanging bag frame body 51. Fixed hooks 52 are arranged on both sides of one end of the hanging bag frame body 51. Swing hooks 56 are arranged on both sides of the other end of the hanging bag frame body 51. Traction wheels 53 are arranged at the four corners of the upper end of the hanging bag frame body 51. The traction wheels 53 are connected to the lower ends of the short drag belt 37 and the long drag belt 33. A bag clamping mechanism 57 is arranged at the center of the hanging bag frame body 51. One side of the upper part of the bag clamping mechanism 57 is hinged to the hanging bag frame body 51. The other side of the upper part of the bag clamping mechanism 57 is hinged to the cylinder rod of a swing-back cylinder 55. The cylinder body of the swing-back cylinder 55 is hinged to the hanging bag frame body 51.

[0008] The bag clamping mechanism 57 includes a bag clamping cylinder body 571. On both sides of the bag clamping cylinder body 571, there are bag clamping plates 572 driven by cylinders. On one side of the upper part of the bag clamping cylinder body 571, there is a swing shaft 573. On the other side of the upper part of the bag clamping cylinder body 571, there is a swing push arm 577. On the side surface of the upper part of the bag clamping cylinder body 571, there is also a dust removal pipe 574 which is communicated with the inside of the bag clamping cylinder body 571. At the upper end of the bag clamping cylinder body 571, there is an annular airbag buckle cover 576. Inside the airbag buckle cover 576, there is an annular sealing airbag 575 which is communicated with an external compressed air reversing valve.

[0009] When the bag clamping mechanism 57 rises to the high bagging and weighing position, the lower end of the sealing cap 45 is inserted into the inside of the sealing airbag 575. After compressed air is introduced into the sealing airbag 575, it expands outward and tightly holds on the outer wall of the lower end of the sealing cap 45. When the bagging and weighing process enters the fine flow stage, the compressed air in the sealing airbag 575 is released, and the sealing airbag 575 retracts, separating its inside from the outer wall of the lower end of the sealing cap 45.

[0010] When the bag clamping mechanism 57 rises to the high bagging and weighing position, the upper end of the dust removal pipe 574 is sleeved and inserted inside the upper dust removal cover.

[0011] The working principle of the present invention is:

[0012] A. Low-position manual bag hanging: After the bag clamping and hanging device 5 descends to the low position, both the swing hook 56 and the bag clamping mechanism 57 swing to the manual operation side. An operator hangs the four corner suspenders of the ton bag on the four hooks, puts the bag mouth of the ton bag on the bag clamping cylinder body 571, the bag clamping plates 572 close to clamp the bag mouth, and then the swing hook 56 and the bag clamping mechanism 57 swing back to the working position;

[0013] B. High-position bagging and weighing: The lifting motor 36 drives the winding wheel 34 to rotate, and the short towing belt 37 and the long towing belt 33 are simultaneously wound around the winding wheel 34, so as to lift the bag clamping and hanging device 5 upward to the bagging and weighing position. At this time, the cylinder body 41 is inserted into the inside of the bag clamping mechanism 57, the lower end of the sealing cap 45 is inserted into the inside of the sealing airbag 575, and the upper end of the dust removal pipe 574 is sleeved and inserted inside the upper dust removal cover. Then the gate cylinder 44 opens the two closed spherical gates 46. After compressed air is introduced into the sealing airbag 575, it expands outward and tightly holds on the outer wall of the lower end of the sealing cap 45 to prevent dust from overflowing from the inside of the sealing airbag 575. The feeding mechanism above the cylinder body 41 drops materials downward, and the materials enter the ton bag through the outlet at the lower end of the cylinder body 41. The generated dust is sucked away by the dust removal pipe 574. The weighing sensor 2 continuously detects the weight of the materials in the ton bag. When the weight value reaches the rough flow threshold, the compressed air in the sealing airbag 575 is released to separate the sealing airbag 575 from the sealing cap 45 by a small gap, and the materials continue to fall into the ton bag in a fine flow manner until the weight reaches the set value, and the feeding above stops;

[0014] C. Full bag lowering and releasing: After weighing is completed, the spherical gate 46 is closed to prevent the residual material and dust in the cylinder 41 from continuing to fall. At the same time, the lifting motor 36 drives the winding wheel 34 to rotate in the opposite direction. The short traction belt 37 and the long traction belt 33 are released from the winding wheel 34 at the same time, thereby releasing the bag clamping and hanging device 5 and the full bag downward onto the conveyor. The fixed hook 52 and the swing hook 56 automatically release the ton bag sling, the bag clamping plate 572 opens to release the bag mouth, and the full ton bag is conveyed to the next workstation.

[0015] The beneficial effects of the present invention are:

[0016] A. The weighing sensor is installed on a fixed platform, and a motor-driven winch-type lifting traction belt is set on the weighing frame. This can achieve high weighing accuracy while adapting to the requirements of various heights and sizes of ton bags;

[0017] B. The winch-type lifting and traction belt mechanism has a lighter overall weight because it does not use a lifting counterweight, which reduces the range of the weighing sensor and improves the weighing accuracy of the system.

[0018] C. By adjusting the counterweight on the weighing frame, the composite center of gravity of all the mechanisms on the weighing frame can be made to coincide with the center of the four weighing sensors, so that each weighing sensor is evenly stressed and the weighing accuracy is improved;

[0019] D. During the coarse flow stage of bagging and weighing, the sealing airbag clings tightly to the outer wall of the sealing cap, preventing dust from escaping. All dust is removed by the dust removal pipe. During the fine flow stage of bagging and weighing, the sealing airbag is separated from the sealing cap. Since very little dust is generated during the fine flow stage, no dust escapes. At this time, all mechanisms on the weighing frame are not in contact with external mechanisms, preventing the additional force exerted by external mechanisms on the weighing system, thereby improving weighing accuracy.

[0020] E. After weighing, the ball gate closes the outlet of the blanking barrel, preventing the residual material and dust inside the blanking barrel from continuing to fall onto the equipment below, improving the working environment and avoiding corrosion of the equipment by the material;

[0021] F. When the spherical gate is opened, it takes up very little space, so that the dust can pass through the position of the spherical gate smoothly without being blocked, thereby improving the dust removal efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional isometric view of the present invention.

[0023] Figure 2 It is the front view of the present invention.

[0024] Figure 3 It is a side view of the present invention.

[0025] Figure 4 It is a schematic structural diagram of the weighing frame 3.

[0026] Figure 5 It is a schematic structural diagram of the fixed blanking cylinder 4.

[0027] Figure 6 It is a schematic structural diagram of the bag clamping and hanging device 5.

[0028] Figure 7 It is a schematic structural diagram of the bag clamping mechanism 57.

[0029] Figure 8 It is a schematic diagram of the working state of low-position manual bag hanging.

[0030] Figure 9 It is a schematic diagram of the working state of high-position bagging and weighing.

[0031] Figure 10 It is a schematic diagram of the working state of the cooperation between the fixed blanking cylinder 4 and the bag clamping mechanism 57 during high-position bagging and weighing. Specific embodiments

[0032] For the specific embodiments of the present invention, refer to Figures 1 to 10 , a high-precision dust-free ton bag packaging machine, which includes a fixed platform 1. Four weighing sensors 2 are provided on the upper end surface of the fixed platform 1. The upper end surface of the weighing sensor 2 is connected to a weighing frame 3. The weighing frame 3 includes a bearing frame body 31. A counterweight 32 is provided at a corner of the bearing frame body 31. The weight and installation position of the counterweight 32 are adjustable. The counterweight 32 makes the horizontal center of gravity of the weighing frame 3 after carrying all mechanisms coincide with the horizontal center of the four weighing sensors 2. A lifting motor 36 is provided at the diagonal position of the counterweight 32. The lifting motor 36 is connected to a lifting main shaft 35 through a chain. Winding wheels 34 are provided at both ends of the lifting main shaft 35. A driven wheel 38 is also provided at the corresponding position on the other side of the bearing frame body 31 parallel to the lifting main shaft 35. One end of a short traction belt 37 and a long traction belt 33 are stacked and fixed on the winding wheel 34. The other end of the short traction belt 37 extends vertically downward after passing through the winding wheel 34. The other end of the long traction belt 33 extends vertically downward after passing through the driven wheel 38. A lifting guide frame 6 is provided on one side of the weighing frame 3. A fixed blanking cylinder 4 is also provided on the fixed platform 1. The vertical center line of the fixed blanking cylinder 4 coincides with the vertical center line of the four weighing sensors 2. A bag clamping and hanging device 5 is provided directly below the fixed blanking cylinder 4. The upper end of the bag clamping and hanging device 5 is connected to the ends of the short traction belt 37 and the long traction belt 33 extending vertically downward. A guide wheel group 54 is provided on one side of the bag clamping and hanging device 5. The guide wheel group 54 moves up and down along the lifting guide frame 6.

[0033] The above-mentioned fixed blanking cylinder 4 includes a cylinder body 41. A gate cylinder 44 is provided at the upper part of the cylinder body 41. The cylinder rod of the gate cylinder 44 is hinged to the rear end of a swing fork 42. The middle part of the swing fork 42 is hinged to the outer wall of the cylinder body 41. The two fork ends at the front part of the swing fork 42 are respectively hinged to the upper ends of gate pull rods 43 vertically arranged on both sides of the cylinder body 41. The lower ends of the gate pull rods 43 are hinged to the upper middle part of a spherical gate 46. Both the left and right ends of the spherical gate 46 are hinged to the outer wall of the cylinder body 41. When the two spherical gates 46 are closed, the lower outlet of the cylinder body 41 can be completely closed. A sealing cap 45 with a closed upper end is also provided on the outer side of the middle part of the cylinder body 41.

[0034] The above-mentioned bag clamping and hanging device 5 includes a hanging bag frame body 51. Fixed hooks 52 are provided on both sides at one end of the hanging bag frame body 51. Swing hooks 56 are provided on both sides at the other end of the hanging bag frame body 51. Traction wheels 53 are provided at the four corners of the upper end of the hanging bag frame body 51. The traction wheels 53 are connected to the lower ends of a short traction belt 37 and a long traction belt 33. A bag clamping mechanism 57 is provided at the center of the hanging bag frame body 51. One side of the upper part of the bag clamping mechanism 57 is hinged to the hanging bag frame body 51. The other side of the upper part of the bag clamping mechanism 57 is hinged to the cylinder rod of a swing-back cylinder 55. The cylinder body of the swing-back cylinder 55 is hinged to the hanging bag frame body 51.

[0035] The above-mentioned bag clamping mechanism 57 includes a bag clamping cylinder body 571. Bag clamping plates 572 driven by cylinders are provided on both sides of the bag clamping cylinder body 571. A swing shaft 573 is provided on one side of the upper part of the bag clamping cylinder body 571. A swing push arm 577 is provided on the other side of the upper part of the bag clamping cylinder body 571. A dust removal pipe 574 is also provided on the side surface of the upper part of the bag clamping cylinder body 571. The dust removal pipe 574 is communicated with the inside of the bag clamping cylinder body 571. An annular airbag buckle cover 576 is provided at the upper end of the bag clamping cylinder body 571. An annular sealing airbag 575 is provided inside the airbag buckle cover 576. The sealing airbag 575 is communicated with an external compressed air reversing valve.

[0036] When the above-mentioned bag clamping mechanism 57 rises to the bagging and weighing position at a high place, the lower end of the sealing cap 45 is inserted into the inside of the sealing airbag 575. After compressed air is introduced into the sealing airbag 575, it expands outward and tightly holds the outer wall of the lower end of the sealing cap 45. When the bagging and weighing process enters the fine flow stage, the compressed air in the sealing airbag 575 is released, and the sealing airbag 575 retracts and separates its inside from the outer wall of the lower end of the sealing cap 45.

[0037] When the above-mentioned bag clamping mechanism 57 rises to the bagging and weighing position at a high place, the upper end of the dust removal pipe 574 is sleeved and inserted inside the upper dust removal cover.

Claims

1. A high-precision dust-free ton bag packaging machine, which comprises a fixed platform (1). Four weighing sensors (2) are arranged on the upper end surface of the fixed platform (1). The upper end surface of the weighing sensor (2) is connected to a weighing frame (3). It is characterized in that: The weighing frame (3) includes a bearing frame body (31). A counterweight block (32) is provided at a corner of the bearing frame body (31). The weight and installation position of the counterweight block (32) are adjustable. The counterweight block (32) makes the horizontal center of gravity of the weighing frame (3) after carrying all mechanisms coincide with the horizontal center of the four weighing sensors (2). A lifting motor (36) is provided at the diagonal position of the counterweight block (32). The lifting motor (36) is connected to a lifting main shaft (35) through a chain. Winding wheels (34) are provided at both ends of the lifting main shaft (35). At the position corresponding to the winding wheels (34) on the other side of the bearing frame body (31) parallel to the lifting main shaft (35), a driven wheel (38) is also provided. One end of a short drag belt (37) and a long drag belt (33) are stacked and fixed on the winding wheel (34). The other end of the short drag belt (37) extends vertically downward after passing through the winding wheel (34). The other end of the long drag belt (33) extends vertically downward after passing through the driven wheel (38). A lifting guide frame (6) is provided on one side of the weighing frame (3). A fixed blanking cylinder (4) is also provided on the fixed platform (1). The vertical center line of the fixed blanking cylinder (4) coincides with the vertical center lines of the four weighing sensors (2). The fixed blanking cylinder (4) includes a cylinder body (41). A gate cylinder (44) is provided at the upper part of the cylinder body (41). The cylinder rod of the gate cylinder (44) is hinged to the rear end of a swing fork (42). The middle part of the swing fork (42) is hinged to the outer wall of the cylinder body (41). The two fork ends at the front of the swing fork (42) are respectively hinged to the upper ends of the gate pull rods (43) vertically arranged on both sides of the cylinder body (41). The lower ends of the gate pull rods (43) are hinged to the upper middle part of a spherical gate (46). The left and right ends of the spherical gate (46) are both hinged to the outer wall of the cylinder body (41). When the two spherical gates (46) are closed, the lower outlet of the cylinder body (41) can be completely closed. A sealing cap (45) with a closed upper end is also provided on the outer side of the middle part of the cylinder body (41). A bag clamping and hanging device (5) is provided directly below the fixed blanking cylinder (4). The upper end of the bag clamping and hanging device (5) is connected to the ends of the vertically extending short drag belt (37) and long drag belt (33). A guide wheel set (54) is provided on one side of the bag clamping and hanging device (5). The guide wheel set (54) moves up and down along the lifting guide frame (6). The bag clamping and hanging device (5) further includes a bag clamping mechanism (57). An annular sealing air bag (575) is provided at the upper end of the bag clamping mechanism (57). When the bag clamping mechanism (57) rises to the bagging and weighing position at a high place, the lower end of the sealing cap (45) is inserted into the inner side of the sealing air bag (575). After compressed air is introduced into the sealing air bag (575), it expands outward and tightly holds the outer wall of the lower end of the sealing cap (45). When the bagging and weighing process enters the fine flow stage, the compressed air in the sealing air bag (575) is released, and the sealing air bag (575) retracts, so that the inner side thereof is separated from the outer wall of the lower end of the sealing cap (45).

2. The high-precision dust-free ton bag packaging machine according to claim 1, characterized in that: The bag clamping and hanging device (5) includes a hanging frame body (51). On both sides of one end of the hanging frame body (51), there are fixed hooks (52). On both sides of the other end of the hanging frame body (51), there are swing hooks (56). At the four corners of the upper end of the hanging frame body (51), there are traction wheels (53). The traction wheels (53) are connected to the lower ends of the short traction belt (37) and the long traction belt (33). At the center of the hanging frame body (51), there is a bag clamping mechanism (57). One side of the upper part of the bag clamping mechanism (57) is hinged to the hanging frame body (51), and the other side of the upper part of the bag clamping mechanism (57) is hinged to the cylinder rod of the swing-back cylinder (55). The cylinder body of the swing-back cylinder (55) is hinged to the hanging frame body (51).

3. The high-precision dust-free ton bag packing machine according to claim 1, characterized in that: The bag clamping mechanism (57) includes a bag clamping cylinder body (571). On both sides of the bag clamping cylinder body (571), there are bag clamping plates (572) driven by cylinders. On one side of the upper part of the bag clamping cylinder body (571), there is a swing shaft (573). On the other side of the upper part of the bag clamping cylinder body (571), there is a swing push arm (577). On the side surface of the upper part of the bag clamping cylinder body (571), there is also a dust removal pipe (574). The dust removal pipe (574) is communicated with the inside of the bag clamping cylinder body (571). At the upper end of the bag clamping cylinder body (571), there is an annular airbag cover (576). Inside the airbag cover (576), there is an annular sealing airbag (575). The sealing airbag (575) is communicated with an external compressed air reversing valve.

4. The high-precision dust-free ton bag packaging machine according to claim 3, characterized in that: When the bag clamping mechanism (57) rises to the bagging and weighing position at a high place, the upper end of the dust removal pipe (574) is inserted into the inside of the upper dust removal cover in a socket manner.

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