Bag opening device

Abstract

To provide a bag unpacking device that reduces the amount of processed material remaining inside the bag after unpacking. [Solution] A bag unpacking device 1 for unpacking a bag 20 containing a material to be processed and removing the material to be processed, comprising: a conveying means 100 for conveying the bag 20; and a bag breaking means 200 for ejecting a water jet toward the bag and making a cut 22 in the bottom of the conveyed bag 20, wherein the bag breaking means 200 is equipped with three or more ejection nozzles for ejecting a water jet, and the ejection nozzles are equipped with one or more movable ejection nozzles 210 that are movable in a direction perpendicular to the conveying direction T1 of the bag 20 by the conveying means 100.

Description

Technical Field

[0001] The present invention relates to a bag-opening device.

Background Art

[0002] Conventionally, in the construction field and the like, bag bodies such as flexible container bags and soil bags are widely used as means for accommodating objects to be processed such as various wastes. For example, in Patent Document 1, wastes are sorted into non-combustibles and combustibles and then each is accommodated in a bag body, and these sorted wastes are transported to a treatment site in a state of being accommodated in the bag body for storage and treatment.

[0003] Here, for example, when decontaminating land contaminated with radioactive substances, a large amount of contaminants containing radioactive substances such as earth and sand, fallen leaves and branches, and vegetation are generated, and these contaminants are packed into a bag body as objects to be processed and temporarily stored. Then, the contaminated objects to be processed are transported to an intermediate storage facility (receiving and sorting facility) in a state of being packed in the bag body, the bag body is opened, and the contents are taken out. The bag body after opening is treated as a combustible. At this time, since a large number of bag bodies filled with contaminated objects containing radioactive substances are carried in, it is important to efficiently and continuously process the opening of the bag bodies.

[0004] In view of the above circumstances, a device has been proposed that uses a water jet to efficiently and continuously open a bag body and take out the object to be processed. (For example, see Patent Document 2.)

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, the apparatus described in Patent Document 2 cuts the bottom of the bag in an X shape, resulting in an opening ratio of less than 64% at the bottom of the bag after opening. Therefore, because the material to be processed remains inside the bag after opening, it increases the workload in the next process and also has a negative impact on the handling of combustible materials in the bag after opening.

[0007] The present invention aims to provide a bag unpacking device that reduces the amount of processed material remaining inside the bag after unpacking. [Means for solving the problem]

[0008] To achieve the above objectives, this invention provides the following means. The present invention relates to a bag unpacking device for unpacking a bag containing an object to be processed and removing the object to be processed, comprising: a conveying means for conveying the bag; and a bag-breaking means for ejecting a water jet toward the bag and making a cut in the bottom of the conveyed bag, wherein the bag-breaking means comprises three or more ejection nozzles for ejecting a water jet, and the ejection nozzles comprise one or more movable ejection nozzles that are movable in a direction perpendicular to the direction in which the bag is conveyed by the conveying means.

[0009] In the above-described bag-unpacking device, the conveying means comprises a first conveying means for conveying the bag body, a second conveying means for conveying the bag body while receiving it from the first conveying means, and a third conveying means for conveying the bag body while receiving it from the second conveying means, wherein the second conveying means may include the bag-breaking means.

[0010] In the above-described bag-unpacking device, the movable ejection nozzles may be provided so as to be movable on the same axis in a direction perpendicular to the direction in which the bag is transported by the transporting means.

[0011] In the above-described bag-breaking device, the ejection nozzle consists of one movable ejection nozzle and two fixed ejection nozzles whose positions are fixed and which do not have a moving mechanism. The fixed ejection nozzles are provided at a different position from the movable ejection nozzle in the direction of transport of the bag, and in a direction perpendicular to the direction of transport of the bag, near one end of the movable range of the movable ejection nozzle or near the other end of the movable range of the movable ejection nozzle or near the inside of it, in a direction perpendicular to the direction of transport of the bag. The bag-breaking means may cut the bottom of the bag in a non-contact manner in a substantially Z-shape or substantially inverted Z-shape.

[0012] In the above-described bag-unpacking device, the fixed nozzle may be located downstream of the movable nozzle in the direction in which the bag body is conveyed by the conveying means.

[0013] The above-described bag-unpacking device includes a detection means for detecting the position of the bag, and a control unit which is communicatively connected to the detection means and performs control of the ejection nozzle. The control unit may recognize the position of the bag using the detection means and perform operation and stopping of the ejection nozzle according to the position of the bag. [Effects of the Invention]

[0014] The present invention provides a bag unpacking device that reduces the amount of material remaining inside the bag after unpacking. [Brief explanation of the drawing]

[0015] [Figure 1] This is a plan view showing the entire processing system according to an embodiment of the present invention. [Figure 2] This is a plan view of a bag-opening device according to an embodiment of the present invention. [Figure 3] This is a side view of a bag-opening device according to an embodiment of the present invention. [Figure 4] This is a perspective view showing the water jet recovery piping included in a bag-opening device according to an embodiment of the present invention. [Figure 5] This is a front view showing an example of a residual material discharge means according to an embodiment of the present invention. [Figure 6] It is a plan view and a side view showing the opening ratio of the bottom surface of the bag body by the bag opening device according to the embodiment of the present invention.

Embodiments for Carrying out the Invention

[0016] The bag opening device according to the embodiment of the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 shows the entire processing system 10 using the bag opening device 1 of the embodiment. The processing system 10 includes a bag opening device 1, a bag temporary placement area 11, a bag supply means 12, a high-pressure water supply device 13, a bag opening conveyance means 14, a residual object to be processed discharge means 15, an object to be processed stock area 16, and a bag body stock area 17 after bag opening.

[0017] The bag body 20 of the present embodiment is a flexible container bag formed using a combustible sheet-like member and is formed in a bottomed cylindrical shape. The bag body 20 is carried into the bag temporary placement area 11 in a state where the object to be processed 30 is accommodated.

[0018] In the processing system 10, with the bag supply means 12 as the upstream and the bag opening conveyance means 14 as the downstream, the direction in which the bag body 20 before bag opening is conveyed is defined as the conveyance direction T1. Also, in the processing system 10, the direction opposite to the direction of gravity is defined as the anti-gravity direction T2. Further, in the processing system 10, the direction orthogonal to the conveyance direction T1 and orthogonal to the anti-gravity direction T2 is defined as the width direction T3. Also, in the processing system 10, with the third conveyance means 130 as the upstream, the object to be processed stock area 16 as the midstream, and the bag body stock area 17 after bag opening as the downstream, the direction in which the bag body 20 after bag opening is conveyed is defined as the processing direction T4.

[0019] Figures 2 and 3 show the bag-opening device 1 of the embodiment. The bag body supply means 12 is, for example, a crane, and conveys the bag body 20 containing the workpiece 30 carried into the bag body temporary placement area 11, and transports it to the bag-opening device 1. The bag-opening device 1 includes a conveying means 100 for sequentially conveying the bag body 20 supplied from the bag body supply means 12, and a bag-breaking means 200 for cutting the bottom 21 of the bag body in a non-contact manner by ejecting a water jet in the direction opposite to the gravity direction T2.

[0020] The bag-breaking means 200 includes one movable ejection nozzle 210 and two fixed ejection nozzles 221 and 222. The one movable ejection nozzle 210 and the two fixed ejection nozzles 221 and 222 included in the bag-breaking means 200 are supplied with high-pressure water by a high-pressure water supply device 13, and can generate a cut 22 in the bottom 21 of the bag body by ejecting the water jet.

[0021] The conveying means 100 includes, from upstream in the conveying direction T1, a first conveying means 110, a second conveying means 120, and a third conveying means 130. The bag body 20 supplied from the bag body supply means 12 is conveyed along the conveying direction T1, first passing through the first conveying means 110, then the second conveying means 120, and finally the third conveying means 130.

[0022] The first conveying means 110 is one belt conveyor that rotates and advances in the conveying direction T1. The first conveying means 110 conveys the bag body 20 supplied from the bag body supply means 12 and supplies it to the second conveying means 120.

[0023] The second conveying means 120 includes, from upstream with respect to the conveying direction T1, a first conveying roller 121, a second conveying roller 122, and a third conveying roller 123. The first conveying roller 121, the second conveying roller 122, and the third conveying roller 123 all have the same shape with a rotation axis parallel to the width direction T3, and are provided to be able to convey the bag body 20 by rotating at the same speed in the conveying direction T1. In the transport direction T1, there is space between the first transport roller 121 and the second transport roller 122, and between the second transport roller 122 and the third transport roller 123 that is large enough for a water jet to pass through.

[0024] The second conveying means 120 includes a movable spray nozzle 210 between the first conveying roller 121 and the second conveying roller 122 in the conveying direction T1. The movable spray nozzle 210 is equipped with a moving mechanism and is configured to be movable in the width direction T3. The range of motion of the movable spray nozzle 210 is set to be wider than the diameter of the bag bottom 21, similar to the distance from one end to the other end of the conveying roller in the width direction T3. Furthermore, the second conveying means 120 is equipped with two fixed discharge nozzles 221 and 222 between the second conveying roller 122 and the third conveying roller 123 in the conveying direction T1. The fixed discharge nozzles 221 and 222 do not have a moving mechanism and are configured to be immovable. The fixed discharge nozzle 221 is positioned in the width direction T3 near the inside of one end of the movable range of the movable discharge nozzle 210. The fixed discharge nozzle 222 is positioned in the width direction T3 near the inside of the other end of the movable range of the movable discharge nozzle 210. The second conveying means 120 conveys the bag body 20 supplied from the first conveying means 110 in the conveying direction T1 by the first conveying roller 121, the second conveying roller 122, and the third conveying roller 123.

[0025] The second transport means 120 includes a detection means for detecting the position of the bag 20. The second transport means 120 also includes a control unit that controls the movement of the movable ejection nozzle 210 and the ejection of water jets from the movable ejection nozzle 210 and the fixed ejection nozzles 221 and 222. The detection means and the control unit are configured to communicate with each other, and the control unit controls the movement of the movable ejection nozzle 210 and the on / off switching of the water jets from the movable ejection nozzle 210 and the fixed ejection nozzles 221 and 222 according to the position of the bag 20 as determined by the detection means. The movable ejection nozzle 210 and the fixed ejection nozzles 221 and 222 continue to eject water jets in the anti-gravity direction T2 as long as the bottom of the bag 21 is directly above the nozzles.

[0026] Figure 4 shows the water jet recovery piping 230 provided in the bag unpacking device 1 of the embodiment. The second transport means 120 includes the water jet recovery piping 230. The water jet recovery piping 230 is connected to the high-pressure water supply device 13. The water jet recovery piping 230 has a pipe opening 231 located opposite the movable ejection nozzle 210 and the fixed ejection nozzles 221, 222, and at a height that does not interfere with the transport of the bag body 20 in the anti-gravity direction T2. ​​The pipe opening 231 of the water jet recovery piping 230, which is opposite the movable ejection nozzle 210, is configured to be movable and follows the movement mechanism of the movable ejection nozzle 210. As a result, the water jet recovery piping 230 recovers a portion of the ejected water jet and returns it to the high-pressure water supply device 13.

[0027] The fixed nozzles 221 and 222 continuously generate cuts 22 near the inside of one end and the other end of the movable range of the movable nozzle 210 in the width direction T3 during a single water jet injection onto a single bag 20. As a result, the fixed nozzles 221 and 222 generate two parallel cuts 22 into the bottom 21 of the bag in the transport direction T1. The movable nozzle 210 moves at a constant speed from one end of its movable range to the other during a single water jet discharge onto a single bag 20. This causes the movable nozzle 210 to generate diagonal cuts 22 in the conveying direction T1. Since the starting point of the movable range reverses each time, the diagonal cuts 22 generated by the movable nozzle 210 also reverse accordingly. Therefore, the bag-breaking means 200 creates a roughly Z-shaped or roughly inverted Z-shaped cut 22 in the bottom 21 of the bag, which is formed by combining two parallel lines generated by the fixed spray nozzles 221 and 222 and one diagonal line that intersects the parallel lines generated by the movable spray nozzle 210. The second conveying means 120 provides the bag 20, which has been broken open by creating the cut 22 in the bottom 21 of the bag, to the third conveying means 130.

[0028] The third conveying means 130 is a single belt conveyor that rotates and moves in the conveying direction T1. The third conveying means 130 conveys the bags 20 that have been opened by having a cut 22 in the bottom 21 of the bag body, which were supplied from the second conveying means 120, and supplies them to the opened bag conveying means 14.

[0029] Figure 5 shows the unpacking and conveying means 14 and the residual processed material discharge means 15 in the processed material stock area 16 of the embodiment. The unpacking and conveying means 14 comprises a hanger rail 301 and a plurality of conveying hooks 302. The hanger rail 301 has a moving mechanism that holds the conveying hooks 302 inside, and the plurality of conveying hooks 302 are movably mounted. The hanger rail 301 has a continuous path that can be conveyed in the processing direction T4. The path of the hanger rail 301 is provided to pass over the third conveying means 130, the processed material stock area 16, and the post-unpacking bag stock area 17.

[0030] The transport hook 302 moves circulating along the path of the hanger rail 301 toward the processing direction T4 by a moving mechanism. The transport hook 302 holds the bag 20 on the third transport means 130, passes over the material to be processed stock area 16, and releases its hold on the bag 20 on the bag stock area 17 after unpacking.

[0031] The residual material discharge means 15 includes a rail step 311 and an obstacle 312. The rail step 311 and the obstacle 312 are formed in the path of the hanger rail 301 in the material storage area 16. When the bag 20 held by the transport hook 302 passes over the rail step 311, the material 30 contained in the bag 20 is discharged from the bag 20 due to the fall energy generated by the step in addition to its own weight. Furthermore, when the bag 20 held by the transport hook 302 collides with the obstacle 312, the material 30 contained in the bag 20 is discharged from the bag 20 due to the impact. The bag 20 held by the transport hook 302 passes over the material to be processed stock area 16, effectively discharging the material to be processed 30 contained in the bag 20 to the material to be processed stock area 16.

[0032] The bags 20, held by the transport hook 302 after the discharge of the material to be processed 30, are released from their hold in the bag storage area 17. The bags 20, stored in the bag storage area 17 after the discharge of the material to be processed 30, are transported outside the processing system 10 and disposed of as combustible waste as appropriate.

[0033] Therefore, in this embodiment, the processing system 10 transports the bag 20 containing the material to be processed 30, which has been brought into the temporary bag storage area 11, to the unpacking device 1 by the bag supply means 12, and unpacks the bag 20 by creating a roughly Z-shaped cut 22 on the bottom 21 of the bag without contact. The processing system 10 then transports the unpacked bag 20 by the unpacking transport means 14, discharges the material to be processed 30 by the residual material discharge means 15 provided in the material to be processed stock area 16, and then stores the unpacked bag 20 in the post-unpacked bag stock area 17.

[0034] Here, Figure 6 illustrates the opening area of ​​the bottom 21 of the bag body in the cut 22 generated by the apparatus described in Patent Document 2 and the bag untying apparatus 1 of the embodiment. Figure 6(a) shows a bag 20 having an X-shaped cut 22a, manufactured using the apparatus described in Patent Document 2. The area occupied by the bottom opening 23a created by the cut 22a (opening ratio) is less than 64% of the area of ​​the bottom 21 of the bag. Figure 6(b) shows a bag 20 having a substantially Z-shaped cut 22b, provided by the bag unpacking device 1 of the embodiment. The area occupied by the bottom opening 23b created by the substantially Z-shaped cut 22b relative to the area of ​​the bottom 21 of the bag (opening ratio) is at least 64% and varies depending on the position of the fixed ejection nozzles 221 and 222 and the speed of the movement mechanism of the movable ejection nozzle 210. The opening ratio increases as the shape of the bottom opening 23b approximates a regular hexagon, and can reach a maximum of 82%. Therefore, it has been demonstrated that the bag unpacking device 1 of the embodiment allows for more favorable discharge of the material to be processed 30 from the bag 20.

[0035] As described above, in the bag unpacking device 1 according to this embodiment, the bag unpacking device 1 includes a conveying means 100 that sequentially conveys the bag bodies 20 supplied from the bag body supply means 12, and a bag breaking means 200 that cuts the bottom of the bag body 21 without contact by ejecting a water jet in the anti-gravity direction T2. ​​The bag breaking means 200 includes one movable ejection nozzle 210 and two fixed ejection nozzles 221, 222. The one movable ejection nozzle 210 and the two fixed ejection nozzles 221, 222 of the bag breaking means 200 are supplied with high-pressure water by a high-pressure water supply device 13, and the ejection of the water jet can generate a cut 22 in the bottom of the bag body 21. As a result, the bag untying device 1 can unty the bag by creating a cut 22 in the bottom 21 of the bag.

[0036] Furthermore, in the bag unpacking device 1 according to this embodiment, the conveying means 100 includes a first conveying means 110, a second conveying means 120, and a third conveying means 130, arranged from upstream in the conveying direction T1. The bag body 20 supplied from the bag body supply means 12 is conveyed in the conveying direction T1, first via the first conveying means 110, then via the second conveying means 120, and finally via the third conveying means 130. The second conveying means 120 includes a first conveying roller 121, a second conveying roller 122, and a third conveying roller 123, arranged from upstream in the conveying direction T1. The second conveying means 120 includes a movable ejection nozzle 210 between the first conveying roller 121 and the second conveying roller 122 in the conveying direction T1. The second conveying means 120 is equipped with two fixed ejection nozzles 221 and 222 between the second conveying roller 122 and the third conveying roller 123 in the conveying direction T1. The second conveying means 120 provides the bag body 20, which has been opened by creating a cut 22 in the bottom 21 of the bag body, to the third conveying means 130. The third conveying means 130 then conveys the bag body 20 supplied from the second conveying means 120, which has been opened by creating a cut 22 in the bottom 21 of the bag body, and supplies it to the bag opening conveying means 14. As a result, the bag unpacking device 1 can unpack the bag by continuously transporting the bag 20 and creating a cut 22 in the bottom 21 of the bag. Therefore, the bag unpacking device 1 can efficiently unpack the bag 20.

[0037] Furthermore, in the bag unpacking device 1 according to this embodiment, the second conveying means 120 includes a movable spray nozzle 210 between the first conveying roller 121 and the second conveying roller 122 in the conveying direction T1. The movable spray nozzle 210 is equipped with a moving mechanism and is configured to be movable in the width direction T3. The range of motion of the movable spray nozzle 210 is set to be wider than the diameter of the bag bottom 21, similar to the distance from one end to the other end of the conveying roller in the width direction T3. As a result, in the bag unpacking device 1, an opening is created at the bottom 21 of the bag downstream of the movable nozzle 210, which reduces the frequency of the material to be processed 30 falling onto the moving mechanism of the movable nozzle 210. Therefore, the bag unpacking device 1 can operate smoothly while suppressing malfunctions of the movable nozzle 210 and the moving mechanism. In addition, the bag unpacking device 1 can reduce the frequency of maintenance of the movable nozzle 210 and the moving mechanism.

[0038] Furthermore, in the bag unpacking device 1 according to this embodiment, the fixed nozzles 221 and 222 continuously generate notches 22 near the inside of one end and the other end of the movable range of the movable nozzle 210 in the width direction T3 during a single water jet injection into one bag 20. As a result, the fixed nozzles 221 and 222 generate two parallel notches 22 in the bottom 21 of the bag in the transport direction T1. The movable nozzle 210 moves at a constant speed from one end of its movable range to the other during a single water jet injection into one bag 20. As a result, the movable nozzle 210 generates diagonal notches 22 in the transport direction T1. Note that the starting point of the movable range reverses each time, and consequently, the diagonal notches 22 generated by the movable nozzle 210 also reverse. Therefore, the bag-breaking means 200 creates a roughly Z-shaped or inverted Z-shaped cut 22 in the bottom 21 of the bag, which is formed by combining two parallel lines generated by the fixed nozzles 221 and 222 and one diagonal line that intersects the parallel lines vertically, generated by the movable nozzle 210. The area occupied by the bottom opening 23b created by the roughly Z-shaped cut 22b relative to the area of ​​the bottom 21 of the bag (opening ratio) is at least 64% and varies depending on the position of the fixed nozzles 221 and 222 and the speed of the movement mechanism of the movable nozzle 210. The opening ratio increases as the shape of the bottom opening 23b approximates a regular hexagon, and can reach a maximum of 82%. As a result, the bag unpacking device 1 can reduce the amount of material to be processed 30 remaining inside the bag 20 after unpacking, thereby improving the workload in the next process and the environmental burden of processing the combustible material in the bag 20 after unpacking.

[0039] Furthermore, in the bag unpacking device 1 according to this embodiment, the second conveying means 120 includes, from upstream with respect to the conveying direction T1, a first conveying roller 121, a second conveying roller 122, and a third conveying roller 123. The second conveying means 120 also includes one movable ejection nozzle 210 between the first conveying roller 121 and the second conveying roller 122 in the conveying direction T1. The second conveying means 120 also includes two fixed ejection nozzles 221 and 222, respectively, between the second conveying roller 122 and the third conveying roller 123 in the conveying direction T1. As a result, the bag unpacking device 1 can further reduce the frequency of the material to be processed 30 falling onto the movable nozzle 210's moving mechanism, because the movable nozzle 210 generates a cut 22 in the bottom 21 of the bag ahead of the fixed nozzles 221 and 222. Therefore, the bag unpacking device 1 can operate the moving mechanism more effectively.

[0040] Furthermore, in the bag unpacking device 1 according to this embodiment, the second transport means 120 includes a detection means for detecting the position of the bag body 20. The second transport means 120 also includes a control unit that controls the movement of the movable ejection nozzle 210 and the ejection of water jets from the movable ejection nozzle 210 and the fixed ejection nozzles 221 and 222. The detection means and the control unit are configured to communicate with each other, and the control unit controls the movement of the movable ejection nozzle 210 and the on / off switching of the water jets from the movable ejection nozzle 210 and the fixed ejection nozzles 221 and 222 according to the position of the bag body 20 as determined by the detection means. The movable ejection nozzle 210 and the fixed ejection nozzles 221 and 222 continue to eject water jets in the anti-gravity direction T2 as long as the bottom of the bag body 21 is directly above the nozzles. As a result, the bag-opening device 1 can operate automatically without requiring an operator. Furthermore, by suppressing the dry-firing of the water jet, the frequency of noise generated during dry-firing can be reduced.

[0041] Although embodiments of the bag-opening device according to the present invention have been described above, the present invention is not limited to the above embodiments and can be modified as appropriate without departing from the spirit of the invention.

[0042] In the present invention, the bag body 20 may be made of other materials and have a shape that allows it to be ruptured by a water jet and to be transported by the bag body supply means 12, the bag unraveling device 1, and the bag unraveling transport means 14. For example, the bag body 20 may be a sandbag without handles, and the bag body supply means 12 and the bag unpacking and transport means 14 may be configured to transport the sandbag.

[0043] In the present invention, the bag supply means 12 and the bag unpacking and conveying means 14 may be conveying means other than suspension conveying. For example, the bag supply means 12 and the bag unpacking and conveying means 14 may be belt conveyors. In that case, the bag unpacking and conveying means 14 on the material to be processed stock area 16 transports the bag bodies 20 using rollers arranged with space between them, similar to the second conveying means 120 of the bag unpacking device 1. The material to be processed 30 passes through the residual material discharge means 15 and is then discharged to the material to be processed stock area 16 through the space between the rollers, and only the bag bodies 20 from which the material to be processed 30 has been discharged are transported to the bag body stock area 17 after unpacking.

[0044] In the present invention, the processing system 10 does not necessarily have to include a temporary storage area 11 for the bags and a storage area 17 for the bags after they have been opened. For example, in the processing system 10, the bag supply means 12 may directly transport the bags 20 from the loading platform of an incoming vehicle or the like. Alternatively, the unpacking and transport means 14 may directly supply the unpacked bags 20 to the loading platform of an outgoing vehicle or the like. This allows the processing system 10 to be operated in a space-saving manner.

[0045] In the present invention, the conveying means 100 in the bag unpacking device 1 does not necessarily have to be composed of multiple conveying means. Furthermore, the conveying means 100 may be any other conveying means as long as it can continuously convey the bag 20. For example, the conveying means 100 may consist of a single roller conveyor. In that case, the lower part of the roller conveyor is equipped with an inclined transfer device that has a downward slope from the third conveying means 130 to the material storage area 16. This prevents the material to be processed 30 from being discharged to areas other than the material to be processed storage area 16.

[0046] In the present invention, the bag unpacking device 1 does not necessarily have to be equipped with a water jet recovery pipe 230. For example, the bag unpacking device 1 may be equipped with a sensor on the top of the bag 20 to detect the operation of the water jet. In that case, the bag unpacking device 1 is configured to stop the corresponding movable nozzle 210 or fixed nozzles 221, 222 when the water jet is detected to be above a certain height in the anti-gravity direction T2. This will result in water conservation and cost reduction.

[0047] In the present invention, the bag unpacking device 1 does not necessarily have to include a detection means for detecting the position of the bag body 20 and a control unit for controlling the movable ejection nozzle 210 and the fixed ejection nozzles 221 and 222. For example, in the second conveying means 120, the first conveying roller 121 and the second conveying roller 122 each have a mechanism that sinks slightly under the weight of the bag, and may be equipped with a switch at the bottom of the rollers to operate the bag-breaking means 200. When the bag 20 is being conveyed, the first conveying roller 121 and the second conveying roller sink slightly under the weight of the bag 20, pressing down the switch provided at the bottom of the rollers. The movable spray nozzle 210 continues to spray a water jet while the switch on the first conveyor roller is pressed. When the bag 20 passes over the first conveyor roller 121 and the switch is no longer pressed, the spraying of the water jet stops. The fixed nozzles 221 and 222 continue to eject water jets while the switch on the second conveyor roller is pressed. When the bag 20 passes over the second conveyor roller 122 and the switch is no longer pressed, the ejection of the water jets stops. This configuration allows the bag-opening device 1 to operate automatically, even though it does not have a detection means or a control unit.

[0048] In the present invention, the bag unpacking device 1 does not necessarily have to be equipped with a means 15 for discharging residual processed material. For example, the transport hook 302 may be equipped with a vibration function, and when it reaches the material storage area 16, it may be configured to vibrate the bag 20 to promote the discharge of the material to be processed 30.

[0049] In the present invention, the bag-breaking means 200 may be equipped with a plurality of movable ejection nozzles 210, or it may be equipped with a single fixed ejection nozzle 221. Furthermore, the cut 22 made in the bottom 21 of the bag body does not have to be substantially Z-shaped, as long as an opening is secured that is sufficient so that no material to be processed 30 remains inside the bag body 20 when the bag body 20 passes through the residual material discharge means 15. Also, the fixed ejection nozzle 221 may be located upstream of the movable ejection nozzle 210. For example, the bag-breaking means 200 may include one fixed nozzle 221 and two movable nozzles 210, 210 located downstream of the fixed nozzle 221 in the transport direction T1. Furthermore, the two movable nozzles 210, 210 may each be provided with a movement mechanism on the same axis in the width direction T3. The fixed discharge nozzle 221 is located upstream of the movable discharge nozzle 210 in the conveying direction T1, and is located at the center of the bottom 21 of the bag in the width direction T3. The movable nozzle 210's movement mechanism has a range of motion in the width direction T3, with the center of the bag bottom 21 and one end of the conveyor roller as its ends. In addition, for one water jet ejection onto one bag bottom 21, it makes one reciprocating motion starting from one end of the range of motion. The other movable nozzle 210 has a movable range of motion in the width direction T3, with its ends at the center of the bag bottom 21 and the other end of the conveyor roller. Furthermore, for each water jet ejection to one bag bottom 21, it performs one reciprocating movement starting from the other end of the movable range. The movable ranges of the two moving mechanisms are designed so as not to interfere with each other. With this configuration, the bag-untying device 1 is equipped with a bag-breaking means 200 that generates an X-shaped cut 22 in the bottom 21 of the bag body, which is a combination of an X-shape and a straight line.

[0050] In the present invention, the bag unpacking device 1 does not have to be a mechanism in which the detection means recognizes the position of the bag body 20 and continues to eject a water jet as long as the bottom of the bag body 21 is directly above the nozzle. For example, the detection means may detect only when the bag 20 is supplied from the first conveying means 110 to the second conveying means. In that case, the control unit sets an approximate time for the bag 20 to be on each nozzle, based on the average time it takes for the bag 20 to reach each nozzle and the average time it takes for the bag 20 to pass over each nozzle, using the time when the bag 20 is supplied to the second conveying means as a reference. When the detection means detects the bag 20, the control unit sprays a water jet from each nozzle according to the set approximate time. This enables the bag-opening device 1 to operate automatically by a simpler means. [Explanation of Symbols]

[0051] 1 Bag opening device 20 Bag body 21 Bag bottom 22, 22a, 22b cuts 30. Items to be processed 100 Conveying means 110 First conveying means 120 Second conveying means 130 Third conveying means 200 Bag breaking means 210 Movable spray nozzle 221,222 Fixed spray nozzle

Claims

1. A bag unpacking device for unpacking a bag containing a material to be processed and discharging the material, A conveying means for transporting the aforementioned bag, The device includes a bag-breaking means that sprays a water jet towards the bag and cuts a slit in the bottom of the bag as it is being transported, The aforementioned bag-breaking means is Equipped with three or more nozzles that emit water jets, The aforementioned nozzle is The system includes one or more movable nozzles that can move in a direction perpendicular to the direction in which the bag is transported by the transporting means. Unpacking device.

2. The aforementioned conveying means is A first conveying means for conveying the bag body, A second conveying means that conveys the bag body while receiving it from the first conveying means, A third conveying means that conveys the bag body while receiving it from the second conveying means, Composed of, The second conveying means is, The bag breaking means is provided, The bag-opening device according to claim 1.

3. The movable nozzle is They are provided so as to be movable along the same axis in a direction perpendicular to the direction in which the bag is conveyed by the conveying means, The bag-opening device according to claim 1.

4. The aforementioned nozzle is One of the aforementioned movable ejection nozzles, A fixed nozzle with two fixed positions and no moving mechanism, Composed of, The aforementioned fixed nozzle is In the conveying direction of the bag, at a position different from the movable ejection nozzle, In a direction perpendicular to the conveying direction of the bag, one end of the movable range of the movable nozzle or the vicinity of its inner side, In a direction perpendicular to the conveying direction of the bag body, the other end of the movable range of the movable nozzle or the vicinity of its inner side, Each of them is provided, The aforementioned bag-breaking means is The bottom of the bag is cut non-contact in a roughly Z-shape or roughly inverted Z-shape. The bag-opening device according to claim 1.

5. In the direction of conveying the bag by the conveying means, The aforementioned fixed nozzle is Located downstream of the aforementioned movable nozzle, The bag-opening device according to claim 4.

6. A detection means for detecting the position of the bag, A control unit which is communicatively connected to the detection means and performs control of the ejection nozzle, It is equipped with, The control unit detects the position of the bag using the detection means and executes the operation and stopping of the ejection nozzle according to the position of the bag. The bag-opening device according to claim 1.

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