Material bag fixing mechanism and material bag opening device

Abstract

The utility model provides a material bag fixing and holding mechanism and a material bag opening device. The material bag fixing and holding mechanism comprises a fixing and holding driving part, a first fixing and holding part, a second fixing and holding part, a first air blowing part and a second air blowing part. The first holding part and the second holding part are respectively in transmission connection with the holding driving part, and a holding space for accommodating a material bag is formed between the first holding part and the second holding part; the first blowing part is arranged on the first holding part, and the second blowing part is arranged on the second holding part; the first air blowing part and the second air blowing part are configured to perform air blowing shaping on a sealing tongue of the material bag located in the holding space; and the holding driving part is configured to drive the first holding part and the second holding part to slide and draw close to the middle so as to hold the body and the sealing tongue of the material bag. According to the material bag fixing mechanism, blowing shaping of the sealing tongue of the material bag is achieved, and the material bag opening mechanism can execute opening operation conveniently.

Description

Technical Field

[0001] The present application relates to the field of single crystal pulling, and in particular to a material bag holding mechanism and a material bag opening device. Background Art

[0002] Silicon materials are generally packaged in bags. The sealed bags have a vertical sealing tongue on the top of the body. Before using the silicon materials, the bag opening mechanism first clamps the sealing tongue and then cuts the bag along the bottom of the sealing tongue.

[0003] However, during storage or transportation, the sealing tongue is bent or drooped downward after being pressed, making it difficult for the bag opening mechanism to smoothly clamp and cut the sealing tongue, thereby affecting production efficiency. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a bag holding mechanism, which adopts the following technical solutions:

[0005] A material bag holding mechanism is configured to hold a material bag containing a material, wherein the material bag comprises a body defining a receiving cavity, a sealing tongue for closing the receiving cavity is formed on the top of the body, and the material bag holding mechanism comprises a holding drive part, a first holding part, a second holding part, a first blowing part, and a second blowing part, wherein:

[0006] The first holding part and the second holding part are respectively connected to the holding driving part in transmission, and a holding space for accommodating the material bag is formed between the first holding part and the second holding part;

[0007] The first blowing part is arranged on the first holding part, and the second blowing part is arranged on the second holding part;

[0008] The first blowing part and the second blowing part are configured to blow and shape the sealing tongue of the bag located in the holding space from both sides so that the sealing tongue is restored to an upright state;

[0009] The holding driving part is configured to drive the first holding part and the second holding part to slide toward the middle to hold the body of the material bag and the sealing tongue of the material bag.

[0010] The material bag holding mechanism provided by the present application is provided with a first blowing part and a second blowing part. Before holding the material bag, the first blowing part and the second blowing part blow air to the sealing tongue of the material bag from both sides, so that the sealing tongue is reshaped and restored to an upright state. Subsequently, the material bag holding mechanism holds the material bag body and the sealing tongue through the first holding part and the second holding part, so that the sealing tongue remains in an upright state, which facilitates the material bag opening mechanism to perform the opening operation.

[0011] In some embodiments, the first blowing part and the second blowing part have the same structure, and the first blowing part includes a mounting seat and a blowing block, wherein: the mounting seat is arranged on the first holding portion; the blowing block is installed on the mounting seat with an adjustable angle, an air channel connected to an external compressed air source is arranged in the blowing block, and a blowing hole connected to the air channel is arranged on the blowing block, and the blowing hole is configured to blow air obliquely upward toward the sealing tongue of the bag.

[0012] By setting the first blowing part and the second blowing part, the first blowing part and the second blowing part simultaneously blow air obliquely upwards from both sides of the sealing tongue. Since the upward oblique wind force borne by both sides of the sealing tongue is equal, the sealing tongue is finally shaped and restored to an upright state.

[0013] In some embodiments, the blowing block is provided with at least one row of blowing holes arranged at intervals parallel to the length direction of the sealing tongue.

[0014] Multiple blowing holes synchronously blow air obliquely upward toward the sealing tongue, which improves the blowing force and uniformity, so that the sealing tongue is reshaped faster and restored to an upright state.

[0015] In some embodiments, the holding drive part includes a first translation drive member and a second translation drive member, wherein: the driving end of the first translation drive member is connected to the first holding part, and the driving end of the second translation drive member is connected to the second holding part; the first translation drive member and the second translation drive member are configured to synchronously drive the first holding part and the second holding part to translate in opposite directions, so that the first holding part and the second holding part slide together toward the middle or slide apart to both sides.

[0016] Through the cooperative driving of the first translation driving member and the second translation driving member, the first holding portion and the second holding portion realize the holding of the material bag body and the sealing tongue of the material bag. In addition, since the first holding portion and the second holding portion are driven by the first translation driving member and the second translation driving member respectively, the sliding strokes of the first holding portion and the second holding portion can be independently adjusted according to the position of the material bag, and finally ensure that the first holding portion and the second holding portion can synchronously contact the material bag body and the sealing tongue of the material bag from both sides, so as to cooperate to hold the material bag body and the sealing tongue of the material bag.

[0017] In some embodiments, the first holding part includes a first sliding bracket and a first adsorption unit, wherein: the first sliding bracket is transmission-connected to the holding drive part, the first adsorption unit is arranged on the first sliding bracket, and the first adsorption unit has a first adsorption surface facing the holding space; the first blowing part is arranged on the first sliding bracket or the first adsorption unit; the second holding part includes a second sliding bracket and a second adsorption unit, wherein: the second sliding bracket is transmission-connected to the holding drive part, the second adsorption unit is arranged on the second sliding bracket, and the second adsorption unit has a second adsorption surface facing the holding space; the second blowing part is arranged on the second sliding bracket or the second adsorption unit; after the material bag enters the holding space, the holding drive part is configured to drive the first sliding bracket and the second sliding bracket to slide closer to the middle, so that the first adsorption unit and the second adsorption unit adsorb the body of the material bag from both sides.

[0018] The first adsorption unit of the first holding part and the second adsorption unit of the second holding part cooperate to adsorb the body of the material bag from both sides, thereby achieving the holding of the body of the material bag.

[0019] In some embodiments, the first holding part also includes a first lifting unit, a first translation unit and a first pressing member, wherein the first lifting unit is arranged on the first sliding bracket, the first translation unit is connected to the driving end of the first lifting unit, and the first pressing member is connected to the driving end of the first translation unit; the second holding part also includes a second lifting unit, a second translation unit and a second pressing member, wherein the second lifting unit is arranged on the second sliding bracket, the second translation unit is connected to the driving end of the second lifting unit, and the second pressing member is connected to the driving end of the second translation unit; after the material bag enters the holding space, the first lifting unit and the second lifting unit are configured to respectively drive the first pressing member and the second pressing member to lift and lower, so that the first pressing member and the second pressing member are aligned with the sealing tongue of the material bag from both sides; the first translation unit and the second translation unit are configured to synchronously drive the first pressing member and the second pressing member to translate toward the sealing tongue to press the sealing tongue from both sides.

[0020] The first pressing member of the first holding part and the second pressing member of the second holding part cooperate to press the sealing tongue of the material bag from both sides, thereby achieving the fixing of the sealing tongue of the material bag. This arrangement ensures the fixing strength of the first holding part and the second holding part on the material bag. On the other hand, since the sealing tongue of the material bag is pressed from both sides by the first pressing member of the first holding part and the second pressing member of the second holding part, it can be ensured that the sealing tongue of the material bag after the blowing shaping is kept in an upright state.

[0021] The present application also provides a material bag opening device, which includes a frame, a material bag opening mechanism and any of the above-mentioned material bag holding mechanisms, wherein: an opening station is arranged in the frame, the material bag opening mechanism is arranged on the frame and is located at the opening station; the material bag holding mechanism is configured to perform air blowing shaping on the sealing tongue of the material bag, and to hold the body of the material bag and the sealing tongue of the material bag that has completed the air blowing shaping; the material bag opening mechanism is configured to cut the sealing tongue of the material bag that has completed the air blowing shaping located at the opening station.

[0022] Through the cooperation of the bag holding mechanism and the bag opening mechanism, the bag opening device provided in the present application realizes automatic opening of the bag.

[0023] In some embodiments, the bag opening device also includes a bag conveying mechanism, wherein: the bag holding mechanism is arranged on the frame and located at the opening station; the bag conveying mechanism is used to convey the bag to the bag opening station; the bag holding mechanism is configured to perform air blowing shaping on the sealing tongue of the bag located at the opening station, and to hold the body of the bag located at the opening station and the sealing tongue of the bag that has completed the air blowing shaping.

[0024] By setting up a bag conveying mechanism, automatic loading of the bag to be opened is realized. The bag holding mechanism is set at the opening station. When the bag to be opened is conveyed to the opening station, the bag holding mechanism and the bag opening mechanism can perform shaping and opening operations on the sealing tongue of the bag in turn, thereby improving the bag opening efficiency.

[0025] In some embodiments, the bag opening device further comprises a moving mechanism, and the bag holding mechanism is installed on a movable part of the moving mechanism; the bag holding mechanism is configured to move to the bag to be opened under the drive of the moving mechanism, and perform air blowing and shaping on the sealing tongue of the bag, and hold the body of the bag and the sealing tongue of the bag that has been air-shaped. The bag holding mechanism is also configured to carry the bag to the opening station under the drive of the moving mechanism.

[0026] By providing a moving mechanism and arranging the bag holding mechanism on the movable part of the moving mechanism, the bag holding mechanism can automatically carry the bag to be opened to the opening station, thereby realizing automatic loading of the bag to be opened. In addition, the bag holding mechanism performs air blowing shaping on the sealing tongue of the bag when picking up the bag to be opened, and holds the sealing tongue that has been blown and shaped during the transportation process, thereby ensuring that the sealing tongue of the bag remains in an upright state.

[0027] In some embodiments, the material bag opening mechanism includes a clamping portion and a cutting portion, wherein: the clamping portion is disposed on a frame and located above an opening station, and the clamping portion is configured to clamp a sealing tongue of the material bag from above; after the clamping portion clamps the sealing tongue of the material bag, the first clamping member and the second clamping member are configured to release and leave the sealing tongue of the material bag; the cutting portion is disposed on the frame, and the cutting portion is configured to cut the sealing tongue of the material bag.

[0028] Before the first pressing member and the second pressing member release and leave the sealing tongue of the material bag, the clamping part clamps the sealing tongue of the material bag from above, thereby avoiding contact and interference with the first pressing member and the second pressing member. After the clamping part clamps the sealing tongue of the material bag from above, the first pressing member and the second pressing member release and leave the sealing tongue of the material bag, thereby exposing the opening position of the sealing tongue, so that the cutting part of the material bag opening mechanism can smoothly cut the sealing tongue of the material bag from the side.

[0029] In some embodiments, the clamping part includes a third lifting unit and a clamping member, wherein the third lifting unit is arranged on the frame, and the clamping member is connected to the driving end of the third lifting unit; the third lifting unit is configured to drive the clamping member to descend toward the opening station, so that the clamping member clamps the sealing tongue of the bag from above.

[0030] A clamping part with a simple structure is provided, which drives the clamping member to rise and fall through a third lifting unit, thereby clamping the sealing tongue from above and avoiding interference with the first holding part and the second holding part.

[0031] In some embodiments, the cutting part includes a lifting and adjusting unit, a mounting bracket, a cutter driving unit, a first cutter assembly and a second cutter assembly, wherein: both ends of the mounting bracket are slidably connected to the frame and are transmission-connected to the lifting and adjusting unit disposed on the frame; the first cutter assembly and the second cutter assembly are slidably connected to the mounting bracket and are transmission-connected to the cutter driving unit disposed on the mounting bracket, respectively, and a cutting space is formed between the first cutter assembly and the second cutter assembly; the lifting and adjusting unit is configured to drive the mounting bracket to descend so that the sealing tongue of the material bag transported to the opening station extends into the cutting space; the cutter driving unit is configured to drive the first cutter assembly and the second cutter assembly to slide closer to the middle so that the first cutter assembly and the second cutter assembly are docked to cut the sealing tongue of the material bag.

[0032] First, the lifting and adjusting unit drives the mounting bracket to descend, so that the sealing tongue of the material bag extends into the cutting space between the first cutter assembly and the second cutter assembly. Then, the cutter drive unit drives the first cutter assembly and the second cutter assembly to slide toward the middle, so that the first cutter assembly and the second cutter assembly are docked to cut the sealing tongue of the material bag. It can be seen that through the coordinated driving of the lifting and adjusting unit and the cutter drive unit, the first cutter assembly and the second cutter assembly can automatically cut the sealing tongue of the material bag.

[0033] In some embodiments, the cutter drive unit includes a first cutter drive member and a second cutter drive member, wherein the driving end of the first cutter drive member is connected to the first cutter assembly, and the second cutter drive member is connected to the second cutter assembly; the first cutter drive member and the second cutter drive member are configured to synchronously drive the first cutter assembly and the second cutter assembly to translate in opposite directions, so that the first cutter assembly and the second cutter assembly slide together toward the middle or slide apart to both sides.

[0034] Through the cooperative driving of the first cutter drive member and the second cutter drive member, the first cutter assembly and the second cutter assembly realize automatic cutting of the sealing tongue of the material bag. In addition, since the first cutter assembly and the second cutter assembly are driven by the first cutter drive member and the second cutter drive member respectively, the sliding strokes of the first cutter assembly and the second cutter assembly can be independently adjusted according to the position of the material bag, ultimately ensuring that the first cutter assembly and the second cutter assembly can both contact the sealing tongue of the material bag and cooperate to automatically cut the sealing tongue of the material bag.

[0035] In some embodiments, the first cutter assembly includes a first cutter holder, a first cutter and at least one first limit block, wherein the first cutter holder is slidably connected to the mounting bracket and is transmission connected to the cutter drive unit, and the first cutter and the first limit block are installed on the first cutter holder; the second cutter assembly includes a second cutter holder, a second cutter and at least one second limit block corresponding to the first limit block, wherein the second cutter holder is slidably connected to the mounting bracket and is transmission connected to the cutter drive unit, and the second cutter and the second limit block are installed on the second cutter holder; when the cutter drive unit drives the first cutter holder and the second cutter holder to slide closer to the middle, the first limit block abuts against the corresponding second limit block, and the first cutter and the second cutter dock to cut the sealing tongue of the material bag.

[0036] By setting the first cutter assembly and the second cutter assembly, the first cutter and the second cutter can be butted together to cut the sealing tongue of the bag. In addition, by limiting the first limit block and the second limit block, the first cutter and the second cutter can be stopped in time after being butted together to prevent the first cutter and the second cutter from being over-pressurized and causing pressure loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1This is a schematic structural diagram of a bag holding mechanism according to an embodiment of the present application;

[0038] Figure 2 It is a schematic structural diagram of the first holding portion and the first blowing portion in an embodiment of the present application at a viewing angle;

[0039] Figure 3 It is a schematic structural diagram of the first holding portion and the first blowing portion in the embodiment of the present application from another perspective;

[0040] Figure 4 It is a schematic structural diagram of a bag opening device in an embodiment of the present application;

[0041] Figure 5 It is a schematic structural diagram of the frame and the bag opening mechanism in the embodiment of the present application at one viewing angle;

[0042] Figure 6 It is a schematic structural diagram of the frame and the bag opening mechanism in the embodiment of the present application from another perspective;

[0043] Figure 7 It is a schematic structural diagram of the clamping part in the embodiment of the present application;

[0044] Figure 8 It is a schematic structural diagram of a cutting portion in an embodiment of the present application;

[0045] Figures 1 to 8 Included:

[0046] Bag holding mechanism 10:

[0047] The holding driving part 11 includes a first translation driving member 111 and a second translation driving member 112;

[0048] The first holding part 12 includes a first sliding bracket 121, a first adsorption unit 122, a first lifting unit 123, a first translation unit 124, a first pressing member 125, a first mounting seat 1231, a lifting cylinder 1232, a first guide rod 1233, a second mounting seat 1234, a translation cylinder 1241, a second guide rod 1242, a pressing rod 1251, and a pressing block 1252;

[0049] The second holding portion 13 includes a second sliding bracket 131 , a second adsorption unit 132 , a second lifting unit 133 , a second translation unit 134 , and a second pressing member 135 ;

[0050] The first blowing part 14 includes a mounting seat 141, a blowing block 142, and a blowing hole 143;

[0051] The second blowing part 15;

[0052] Base 16;

[0053] Rack 20;

[0054] Bag opening mechanism 30:

[0055] The clamping part 31 includes a third lifting unit 311 and a clamping member 312;

[0056] Cutting section 32: lifting adjustment unit 321, mounting bracket 322, cutter driving unit 323, first cutter assembly 324, second cutter assembly 325; first cutter driving member 3231, second cutter driving member 3232, first cutter seat 3241, first cutter 3242, first limit block 3243, second cutter seat 3251, second cutter 3252, second limit block 3253;

[0057] Bag conveying mechanism;

[0058] Moving mechanism 50. DETAILED DESCRIPTION

[0059] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0060] like Figures 1 to 3 As shown, the embodiment of the present application provides a material bag holding mechanism, which is used to hold a material bag 100 containing a material, the material bag 100 includes a body 101 defining a receiving cavity, and a sealing tongue 102 for closing the receiving cavity is formed on the top of the body 101. The material bag 100 can be a material bag for dispensing silicon material, and of course, the material bag 100 can also be a material bag for dispensing other materials.

[0061] The bag holding mechanism 10 in the embodiment of the present application includes a holding driving part 11, a first holding part 12, a second holding part 13, a first blowing part 14 and a second blowing part 15, wherein:

[0062] The first holding portion 12 and the second holding portion 13 are respectively connected to the holding driving portion 11 in a transmission manner, and a holding space for accommodating the material bag is formed between the first holding portion 12 and the second holding portion 13 .

[0063] The first blowing portion 14 is disposed on the first holding portion 12 , and the second blowing portion 15 is disposed on the second holding portion 13 .

[0064] The first blowing part 14 and the second blowing part 15 are configured to perform blowing shaping on the sealing tongue 102 of the material bag 100 located in the holding space from both sides so that the sealing tongue 102 is restored to an upright state;

[0065] The holding driving part 11 is configured to drive the first holding part 12 and the second holding part 13 to slide toward the middle to hold the body 101 of the material bag 100 and the sealing tongue 102 of the material bag 100 .

[0066] The working process of the bag holding mechanism 10 in the embodiment of the present application is as follows:

[0067] First, the bag holding mechanism 10 is controlled to move toward the bag 100 to be opened, so that the bag 100 to be opened enters the holding space between the first holding portion 12 and the second holding portion 13. Alternatively, the bag holding mechanism 10 does not move, and the bag 100 to be opened is controlled to move toward the bag holding mechanism 10, so that the bag 100 enters the holding space between the first holding portion 12 and the second holding portion 13.

[0068] Next, the first blowing unit 14 and the second blowing unit 15 are controlled to blow and shape the sealing tongue 102 of the material bag 100 in the holding space from both sides, so that the sealing tongue 102 is restored to an upright state.

[0069] Next, the holding driving part 11 is controlled to drive the first holding part 12 and the second holding part 13 to slide toward the middle, so that the first holding part 12 and the second holding part 13 hold the body 101 and the sealing tongue 102 of the material bag 100, so that the material bag 100 is fixed and the sealing tongue 102 of the material bag 100 remains in an upright state, which facilitates the material bag opening mechanism to perform the opening operation.

[0070] Optionally, the first blowing part 14 and the second blowing part 15 have the same structure. Taking the first blowing part 14 as an example, it includes a mounting seat 141 and a blowing block 142, wherein: the mounting seat 141 is arranged on the first holding portion 12. The blowing block 142 is installed on the mounting seat 141 with an adjustable angle, an air channel connected to an external compressed air source is arranged in the blowing block 142, and a blowing hole 143 connected to the air channel is arranged on the blowing block 142, and the blowing hole 143 is configured to blow air obliquely upward toward the sealing tongue 102 of the material bag 100.

[0071] By providing the first air blowing part 14 and the second air blowing part 15, the first air blowing part 14 and the second air blowing part 15 simultaneously blow air obliquely upward from both sides of the sealing tongue 102 toward the sealing tongue 102. Since the upward oblique wind force borne by both sides of the sealing tongue 102 is equal, the sealing tongue 102 is finally shaped and restored to an upright state.

[0072] Optionally, a circular mounting hole is provided on the mounting seat 141, and an arc-shaped guide hole is provided on the air blowing block 142. The end of the air blowing block 142 is rotatably connected to the mounting seat 141 via a bolt that passes through the guide hole and the mounting hole. After loosening the bolt, the air blowing block 142 can be pushed to rotate relative to the mounting seat 141, thereby implementing an angle adjustment of the air blowing block 142 to ensure that the air blowing hole 143 blows air toward the sealing tongue 102 of the material bag 100 at a predetermined tilt angle. After completing the angle adjustment of the air blowing block 142, tighten the bolt again to fix the air blowing block 142 on the mounting seat 141.

[0073] Optionally, the blowing block 142 is provided with at least one row (for example Figure 3 The plurality of blowing holes 143 are arranged in a row in parallel to the length direction of the sealing tongue 102. The plurality of blowing holes 143 simultaneously blow air obliquely upward toward the sealing tongue 102, thereby increasing the blowing force and uniformity, so that the sealing tongue 102 is reshaped faster and restored to an upright state.

[0074] like Figure 1 As shown, optionally, the holding driving part 11 includes a first translation driving member 111 and a second translation driving member 112, wherein: the driving end of the first translation driving member 111 is connected to the first holding part 12, and the driving end of the second translation driving member 112 is connected to the second holding part 13. The first translation driving member 111 and the second translation driving member 112 are configured to synchronously drive the first holding part 12 and the second holding part 13 to translate in opposite directions, so that the first holding part 12 and the second holding part 13 slide toward the middle or slide to both sides and separate.

[0075] Through the cooperative driving of the first translation driving member 111 and the second translation driving member 112, the first holding portion 12 and the second holding portion 13 realize the holding of the body 101 of the material bag 100 and the sealing tongue 102 of the material bag 100. In addition, since the first holding portion 12 and the second holding portion 13 are driven by the first translation driving member 111 and the second translation driving member 112 respectively, the sliding strokes of the first holding portion 12 and the second holding portion 13 can be independently adjusted according to the position of the material bag 100, and finally ensure that the first holding portion 12 and the second holding portion 13 can synchronously contact the material bag 100 from both sides, so as to cooperate to hold the body 101 of the material bag 100 and the sealing tongue of the material bag 102.

[0076] like Figure 1As shown, optionally, the holding driving part 11 further includes a base 16. The first translation driving member 111 and the second translation driving member 112 are both mounted on the base 16. A guide rail is also provided on the base 16, and the first holding part 12 and the second holding part 13 are respectively slidably connected to the guide rail via a slider. The first translation driving member 111 and the second translation driving member 112 synchronously drive the first holding part 12 and the second holding part 13 to slide in opposite directions on the base 16 along the guide rail. The first translation driving member 111 and the second translation driving member 112 can both adopt existing translation driving members, such as a cylinder.

[0077] Optionally, the first holding portion 12 includes a first sliding bracket 121 and a first adsorption unit 122, wherein: the first sliding bracket 121 is in transmission connection with the holding drive portion 11, the first adsorption unit 122 is disposed on the first sliding bracket 121, and the first adsorption unit 122 has a first adsorption surface facing the holding space. The first blowing portion 14 is disposed on the first sliding bracket 121 or the first adsorption unit 122.

[0078] Similarly, the second holding portion 13 includes a second sliding bracket 131 and a second adsorption unit 132, wherein: the second sliding bracket 131 is in transmission connection with the holding driving portion 11, the second adsorption unit 132 is arranged on the second sliding bracket 131, and the second adsorption unit 132 has a second adsorption surface facing the holding space. The second blowing portion 15 is arranged on the second sliding bracket 131 or the second adsorption unit 132.

[0079] When the material bag 100 enters the holding space, the holding driving unit 11 is configured to drive the first sliding bracket 121 and the second sliding bracket 131 to slide toward the middle, so that the first suction unit 122 and the second suction unit 132 suction the body 101 of the material bag 100 from both sides, thereby suctioning and fixing the body 101 of the material bag 100. That is, the first suction unit 122 suctions one side of the body 191 of the material bag 100, and the second suction unit 132 suctions the other side of the body 101 of the material bag 100.

[0080] Optionally, the first adsorption unit 122 and the second adsorption unit 132 are both suction cup components whose adsorption surfaces are covered with sponges.

[0081] like Figures 1 to 3As shown, optionally, the first holding portion 12 further includes a first lifting unit 123, a first translation unit 124 and a first pressing member 125, wherein the first lifting unit 123 is disposed on the first sliding bracket 121, the first translation unit 124 is connected to the driving end of the first lifting unit 123, and the first pressing member 125 is connected to the driving end of the first translation unit 124. Similarly, the second holding portion 13 further includes a second lifting unit 133, a second translation unit 134 and a second pressing member 135, wherein the second lifting unit 133 is disposed on the second sliding bracket 131, the second translation unit 134 is connected to the driving end of the second lifting unit 133, and the second pressing member 135 is connected to the driving end of the second translation unit 134.

[0082] After the material bag 100 enters the holding space, the first lifting unit 123 and the second lifting unit 133 are configured to respectively drive the first pressing member 125 and the second pressing member 135 to move up and down, so that the first pressing member 125 and the second pressing member 135 are aligned with the sealing tongue 102 of the material bag 100 from both sides. The first translation unit 124 and the second translation unit 134 are configured to synchronously drive the first pressing member 125 and the second pressing member 135 to translate toward the sealing tongue 102 of the material bag 100, so as to press the sealing tongue 102 from both sides.

[0083] The first pressing member 125 of the first holding portion 12 and the second pressing member 135 of the second holding portion 13 cooperate to press the sealing tongue 102 of the material bag 100 from both sides, thereby achieving the holding of the sealing tongue 102 of the material bag 100. In this way, on the one hand, the holding strength of the first holding portion 12 and the second holding portion 13 on the material bag 100 is guaranteed, and on the other hand, since the sealing tongue 102 of the material bag 100 is pressed from both sides by the first pressing member 125 of the first holding portion 12 and the second pressing member 135 of the second holding portion 13, it is ensured that the sealing tongue 102 of the material bag 100 remains in an upright state.

[0084] Optionally, the first lifting unit 123 has the same structure as the second lifting unit 133. Taking the first lifting unit 123 as an example, it includes a first mounting seat 1231, a lifting cylinder 1232, a first guide rod 1233 and a second mounting seat 1234, wherein the first mounting seat 1231 is fixedly mounted on the first sliding bracket 121, the lifting cylinder 1232 is mounted on the first mounting seat 1231, and the first guide rod 1233 is vertically connected to the first mounting seat 1231 and can slide up and down relative to the first mounting seat 1231. The second mounting seat 1234 is connected to the upper end of the first guide rod 1233 and is connected to the telescopic rod of the lifting cylinder 1232, and the first translation unit 124 is arranged on the second mounting seat 1234.

[0085] When the telescopic rod of the lifting cylinder 1232 extends upward, the second mounting seat 1234 rises, and during this process, the first guide rod 1233 slides upward relative to the first mounting seat 1231, thereby guiding the second mounting seat 1234 to rise. When the telescopic rod of the lifting cylinder 1232 retracts downward, the second mounting seat 1234 descends, and during this process, the first guide rod 1233 slides downward relative to the first mounting seat 1231, thereby guiding the second mounting seat 1234 to descend.

[0086] Optionally, the first translation unit 124 has the same structure as the second translation unit 134. Taking the first translation unit 124 as an example, it includes a translation cylinder 1241 and a second guide rod 1242, wherein the translation cylinder 1241 is mounted on the second mounting seat 1234, and the second guide rod 1242 is horizontally connected to the second mounting seat 1234 and can slide horizontally relative to the second mounting seat 1234. The first pressing member 125 is connected to the end of the second guide rod 1242 and is connected to the telescopic rod of the translation cylinder 1241.

[0087] When the telescopic rod of the translation cylinder 1241 extends toward the holding space, the first pressing member 125 presses one side of the sealing tongue 102 of the material bag 100. During this process, the second guide rod 1242 slides relative to the second mounting seat 1234 toward the holding space, thereby guiding the first pressing member 125. When the telescopic rod of the translation cylinder 1241 retracts away from the holding space, the first pressing member 125 is separated from one side of the sealing tongue 102. During this process, the second guide rod 1242 slides relative to the second mounting seat 1234 away from the holding space, thereby guiding the first pressing member 125.

[0088] Optionally, the first pressing member 125 has the same structure as the second pressing member 135. Taking the first pressing member 125 as an example, it includes a pressing rod 1251 and a pressing block 1252, wherein the pressing rod 1251 is connected to the end of the second guide rod 1242 and to the telescopic rod of the translation cylinder 1241, the length direction of the pressing rod 1251 is parallel to the length direction of the sealing tongue 102, and the pressing block 1252 is arranged on the side of the pressing rod 1251 facing the holding space. When the telescopic rod of the translation cylinder 1241 extends toward the holding space, the pressing block 1252 presses one side of the sealing tongue 102 of the material bag 100. Optionally, two pressing blocks 1252 are provided, and the two pressing blocks 1252 are arranged at both ends of the pressing rod 1251, and the two pressing blocks 1252 are used to press the two opposite edges of the sealing tongue 102.

[0089] The present application also provides a bag opening device, such as Figure 4As shown, the bag opening device in the embodiment of the present application comprises a frame 20, a bag opening mechanism 30 and a bag holding mechanism 10 of any of the above embodiments, wherein: an opening station is arranged in the frame 20, and the bag opening mechanism 30 is arranged on the frame 20 and located at the opening station. The bag holding mechanism 10 is configured to perform air blowing shaping on the sealing tongue 102 of the bag 100, and to hold the body 101 of the bag 100 and the sealing tongue 102 of the bag 100 that has been blown and shaped. The bag opening mechanism 30 is configured to cut the sealing tongue 102 of the bag 100 that has been blown and shaped at the opening station.

[0090] It can be seen that, through the cooperation between the bag holding mechanism 10 and the bag opening mechanism 30 , the bag opening device provided in the embodiment of the present application realizes the automatic opening of the bag 100 .

[0091] Continue to refer Figure 4 As shown, optionally, the bag opening device in the embodiment of the present application further includes a moving mechanism 50, and the bag holding mechanism 10 is installed on the movable part of the moving mechanism 50. The moving mechanism 50 is used to drive the bag holding mechanism 10 to move. The bag holding mechanism 10 is configured to move to the bag 100 to be opened under the drive of the moving mechanism 50. For example, the bag 100 to be opened is buffered by the bag conveying mechanism or the handling mechanism to a loading station near the moving mechanism 50, and the moving mechanism 50 drives the bag holding mechanism 10 to pick up the bag 100 to be opened from the loading station.

[0092] Driven by the moving mechanism 50, the bag holding mechanism 10 first moves toward the bag 100 to be opened at the loading station, so that the bag 100 to be opened enters the holding space. After the bag holding mechanism 100 completes the blowing and shaping of the sealing tongue 102 of the bag 100, it immediately holds the body 101 of the bag 100 and the sealing tongue 102 of the bag 100 that has completed the blowing and shaping.

[0093] The bag holding mechanism 10 is then driven by the moving mechanism 50 to move to the opening station to receive the opening operation of the bag opening mechanism 30 .

[0094] The moving mechanism 50 can adopt an existing driving device capable of driving the bag holding mechanism 10 to move horizontally and vertically. For example, the moving mechanism 50 can be Figure 4 The robot arm in the

[0095] It can be seen that by providing the moving mechanism 50 and arranging the bag holding mechanism 10 on the movable part of the moving mechanism 50, the bag holding mechanism 10 can automatically carry the bag 100 to be opened to the opening station, thereby realizing automatic loading of the bag 100 to be opened.

[0096] In addition, the bag holding mechanism 10 performs air blowing shaping on the sealing tongue 102 of the bag 100 when picking up the bag 100 to be opened, and holds the sealing tongue 102 that has been blown and shaped during transportation, thereby ensuring that the sealing tongue 102 of the bag 100 always remains upright.

[0097] In another optional embodiment, the bag opening device of the present application further comprises a bag conveying mechanism, and the bag holding mechanism 10 is arranged on the frame 200 and located at the opening station. The bag conveying mechanism is used to convey the bag 100 to the bag opening station. The bag holding mechanism 10 is configured to perform air blowing shaping on the sealing tongue 102 of the bag 100 located at the opening station, and to hold the body 101 of the bag 100 located at the opening station and the sealing tongue 102 of the bag 100 that has completed air blowing shaping.

[0098] By setting up the bag conveying mechanism, the automatic loading of the bag 100 to be opened is realized. The bag holding mechanism 10 is set at the opening station. When the bag 100 to be opened is conveyed to the opening station, the bag holding mechanism 10 and the bag opening mechanism 30 can perform the shaping and opening operations of the sealing tongue of the bag in turn, thereby improving the bag opening efficiency.

[0099] like Figures 5 and 6 As shown, optionally, the material bag opening mechanism 30 includes a clamping part 31 and a cutting part 32, wherein: the clamping part 31 is disposed on the frame 20 and located above the opening station, and the clamping part 31 is configured to clamp the sealing tongue 102 of the material bag 100 from above. After the clamping part 31 clamps the sealing tongue 102 of the material bag 100, the first pressing member 125 and the second pressing member 135 are configured to release and leave the sealing tongue 102 of the material bag 100. Specifically, the first pressing member 125 and the second pressing member 135 are controlled to move away from each other by the first translation unit 124 and the second translation unit 134 to release the sealing tongue 102, and the first pressing member 125 and the second pressing member 135 are controlled to descend by the first lifting unit 123 and the second lifting unit 133 to make room for the cutting part 32 to cut the material bag 100. The cutting part 32 is disposed on the frame. After the first pressing member 125 and the second pressing member 135 are released and leave the sealing tongue 102 of the material bag 100 , the cutting part 32 is configured to cut the sealing tongue 102 of the material bag 100 .

[0100] Before the first pressing member 125 and the second pressing member 135 release and leave the sealing tongue 102 of the material bag 100, the clamping portion 31 clamps the sealing tongue 102 of the material bag 100 from above, thereby avoiding contact and interference with the first holding portion 12 and the second holding portion 13. After the clamping portion 31 clamps the sealing tongue 102 of the material bag 100 from above, the first pressing member 125 and the second pressing member 135 release and leave the sealing tongue 102 of the material bag 100, thereby exposing the opening position of the sealing tongue 102, so that the cutting portion 32 of the material bag opening mechanism 30 can smoothly cut the sealing tongue 102 of the material bag 100 from the side.

[0101] like Figure 7 As shown, optionally, the clamping portion 31 includes a third lifting unit 311 and a clamping member 312, wherein the third lifting unit 311 is disposed on the frame 20, and the clamping member 312 is connected to the driving end of the third lifting unit 311. The third lifting unit 311 is configured to drive the clamping member 312 to descend toward the opening station, so that the clamping member 312 clamps the sealing tongue 102 of the material bag 100 from above.

[0102] The third lifting unit 311 drives the clamping member 312 to rise and fall, thereby clamping the sealing tongue 102 from above, avoiding interference with the first holding portion 12 and the second holding portion 13 .

[0103] The third lifting unit 311 can adopt various existing linear drive modules that can drive the clamping member 312 to rise and fall. For example, the driving clamping member 312 includes a vertical cylinder and a lifting mounting plate, wherein the vertical cylinder is mounted on the frame 20, the lifting mounting plate is connected to the telescopic rod of the vertical cylinder, and the clamping member 312 is mounted on the lifting mounting plate. In order to ensure the clamping force of the sealing tongue 102 of the material bag 100, two clamping members 312 can be provided, and the two clamping members 312 clamp the sealing tongue 102 of the material bag 100 from two different positions.

[0104] The clamping member 312 may be, for example, a clamping jaw driven by a clamping jaw cylinder.

[0105] like Figure 8As shown, optionally, the cutting part 32 includes a lifting and adjusting unit 321, a mounting bracket 322, a cutter driving unit 323, a first cutter assembly 324 and a second cutter assembly 325, wherein: both ends of the mounting bracket 322 are slidably connected to the frame 20, and are in driving connection with the lifting and adjusting unit 321 disposed on the frame 20. The first cutter assembly 324 and the second cutter assembly 325 are slidably connected to the mounting bracket 322, and are respectively in driving connection with the cutter driving unit 323 disposed on the mounting bracket 322, and a cutting space is formed between the first cutter assembly 324 and the second cutter assembly 325. The lifting and adjusting unit 321 is configured to drive the mounting bracket 322 to descend, so that the sealing tongue 102 of the material bag 100 transported to the opening station extends into the cutting space. The cutter driving unit 323 is configured to drive the first cutter assembly 324 and the second cutter assembly 325 to slide toward the middle so that the first cutter assembly 324 and the second cutter assembly 225 are docked to cut the sealing tongue 102 of the bag 100 .

[0106] The working process of the cutting unit 32 is as follows:

[0107] After the material bag 100 enters the opening station, the lifting and adjusting unit 321 drives the mounting bracket 322 to descend, so that the sealing tongue 102 of the material bag 100 extends into the cutting space between the first cutting knife assembly 324 and the second cutting knife assembly 325 .

[0108] Next, the cutter drive unit 323 drives the first cutter assembly 324 and the second cutter assembly 325 to slide toward the middle, so that the first cutter assembly 324 and the second cutter assembly 325 are connected to cut the sealing tongue 102 of the material bag 100. It can be seen that the first cutter assembly 324 and the second cutter assembly 325 can automatically cut the sealing tongue 102 of the material bag 100 through the coordinated driving of the lifting adjustment unit 321 and the cutter drive unit 323.

[0109] Optionally, two lifting adjustment units 321 are provided, and the two ends of the mounting bracket 322 are respectively connected to the driving end of one of the lifting adjustment units 321. The two lifting adjustment units 321 synchronously drive the mounting bracket 322 to rise and fall from both ends, thereby ensuring the smoothness of the lifting of the mounting bracket 322 and preventing the mounting bracket 322 from tilting during the lifting process. The lifting adjustment unit 321 can adopt various existing linear drive modules that can drive the mounting bracket 322 to rise and fall, such as a cylinder.

[0110] The cutter drive unit 323 includes a first cutter drive member 3231 and a second cutter drive member 3232, wherein a driving end of the first cutter drive member 3231 is connected to the first cutter assembly 324, and the second cutter drive member 3232 is connected to the second cutter assembly 325. The first cutter drive member 3231 and the second cutter drive member 3232 are configured to synchronously drive the first cutter assembly 324 and the second cutter assembly 325 to translate in opposite directions, so that the first cutter assembly 324 and the second cutter assembly 325 slide toward the middle or slide to the sides and separate.

[0111] Through the cooperative driving of the first cutter driving member 3231 and the second cutter driving member 3232, the first cutter assembly 324 and the second cutter assembly 325 realize automatic cutting of the sealing tongue 102 of the material bag 100. In addition, since the first cutter assembly 324 and the second cutter assembly 325 are driven by the first cutter driving member 3231 and the second cutter driving member 3232 respectively, the sliding strokes of the first cutter assembly 324 and the second cutter assembly 325 can be independently adjusted according to the position of the material bag 100, and finally ensure that the first cutter assembly 324 and the second cutter assembly 325 can both contact the sealing tongue 102 of the material bag 100 and cooperate to automatically cut the sealing tongue 102 of the material bag 100.

[0112] Optionally, the first cutter assembly 324 includes a first cutter seat 3241, a first cutter 3242 and at least one first stop block 3243, wherein the first cutter seat 3241 is slidably connected to the mounting bracket 322 and is in transmission connection with the cutter drive unit 323, and the first cutter 3242 and the first stop block 3243 are mounted on the first cutter seat 3241. Similarly, the second cutter assembly 325 includes a second cutter seat 3251, a second cutter 3252 and at least one second stop block 3253 corresponding to the first stop block 3243, wherein the second cutter seat 3251 is slidably connected to the mounting bracket 322 and is in transmission connection with the cutter drive unit 323, and the second cutter 3252 and the second stop block 3253 are mounted on the second cutter seat 3251.

[0113] When the cutter driving unit 323 drives the first cutter seat 3241 and the second cutter seat 3251 to slide toward the middle, the first limit block 3243 abuts against the corresponding second limit block 3253, and the first cutter 3242 and the second cutter 3252 are connected to cut the sealing tongue 102 of the bag 100.

[0114] It can be seen that by configuring the first cutter assembly 324 and the second cutter assembly 325 , the first cutter 3242 and the second cutter 3252 can be butted against each other to cut the sealing tongue 102 of the material bag 100 .

[0115] In addition, since the first knife seat 3241 is provided with a first stopper 3243, and the second knife seat 3251 is provided with a second stopper 3253 matching the first stopper 3243, the first cutter 3242 and the second cutter 3252 can be stopped in time after docking, so as to prevent the first cutter 3242 and the second cutter 3252 from being over-pressurized and causing pressure loss.

[0116] The present application is described in sufficient detail above with certain particularity. It should be understood by those skilled in the art that the description in the embodiments is merely exemplary, and all changes made without departing from the true spirit and scope of the present application should fall within the scope of protection of the present application. The scope of protection claimed in the present application is defined by the claims, rather than by the above description in the embodiments.

Claims

1. A bag holding mechanism, characterized in that: The material bag is configured to hold a material bag containing a material, the material bag comprises a body defining a receiving cavity, a sealing tongue for closing the receiving cavity is formed on the top of the body, and the material bag holding mechanism comprises a holding driving part, a first holding part, a second holding part, a first blowing part and a second blowing part, wherein: The first holding part and the second holding part are respectively connected to the holding driving part by transmission, and a holding space for accommodating the material bag is formed between the first holding part and the second holding part; The first blowing part is arranged on the first holding part, and the second blowing part is arranged on the second holding part; The first blowing part and the second blowing part are configured to perform blowing shaping on the sealing tongue of the material bag located in the holding space from both sides so that the sealing tongue is restored to an upright state; The holding driving part is configured to drive the first holding part and the second holding part to slide toward the middle to hold the body of the material bag and the sealing tongue of the material bag.

2. The bag holding mechanism according to claim 1, characterized in that: The first blowing part and the second blowing part have the same structure, and the first blowing part includes a mounting seat and a blowing block, wherein: The mounting seat is arranged on the first holding portion; The blowing block is installed on the mounting seat with an adjustable angle, an air passage connected to an external compressed air source is arranged inside the blowing block, a blowing hole connected to the air passage is arranged on the blowing block, and the blowing hole is configured to blow air obliquely upward toward the sealing tongue of the bag.

3. The bag holding mechanism according to claim 2, characterized in that: The blowing block is provided with at least one row of blowing holes which are arranged at intervals parallel to the length direction of the sealing tongue.

4. The bag holding mechanism according to claim 1, wherein: The holding driving part includes a first translation driving member and a second translation driving member, wherein: a driving end of the first translation driving member is connected to the first holding part, and a driving end of the second translation driving member is connected to the second holding part; The first translation driving member and the second translation driving member are configured to synchronously drive the first holding portion and the second holding portion to translate in opposite directions, so that the first holding portion and the second holding portion slide together toward the middle or slide apart toward both sides.

5. The bag holding mechanism according to claim 1, wherein: The first holding portion includes a first sliding bracket and a first adsorption unit, wherein: The first sliding bracket is in transmission connection with the holding driving part, the first adsorption unit is arranged on the first sliding bracket, and the first adsorption unit has a first adsorption surface facing the holding space; The first blowing part is arranged on the first sliding bracket or the first adsorption unit; The second holding portion includes a second sliding bracket and a second adsorption unit, wherein: The second sliding bracket is in driving connection with the holding driving part, the second adsorption unit is arranged on the second sliding bracket, and the second adsorption unit has a second adsorption surface facing the holding space; The second blowing part is arranged on the second sliding bracket or the second adsorption unit; After the material bag enters the holding space, the holding drive unit is configured to drive the first sliding bracket and the second sliding bracket to slide toward the middle, so that the first adsorption unit and the second adsorption unit adsorb the body of the material bag from both sides.

6. The bag holding mechanism according to claim 5, wherein: The first holding portion further includes a first lifting unit, a first translation unit and a first pressing member, wherein the first lifting unit is disposed on the first sliding bracket, the first translation unit is connected to a driving end of the first lifting unit, and the first pressing member is connected to the driving end of the first translation unit; The second holding portion further includes a second lifting unit, a second translation unit and a second pressing member, wherein the second lifting unit is disposed on the second sliding bracket, the second translation unit is connected to a driving end of the second lifting unit, and the second pressing member is connected to a driving end of the second translation unit; After the material bag enters the holding space, the first lifting unit and the second lifting unit are configured to respectively drive the first pressing member and the second pressing member to lift and lower, so that the first pressing member and the second pressing member are aligned with the sealing tongue of the material bag from both sides; the first translation unit and the second translation unit are configured to synchronously drive the first pressing member and the second pressing member to translate toward the sealing tongue, so as to press the sealing tongue from both sides.

7. A bag opening device, characterized in that: The bag opening device comprises a frame, a bag opening mechanism and a bag holding mechanism according to any one of claims 1 to 6, wherein: An opening station is provided in the frame, and the bag opening mechanism is provided on the frame and located at the opening station; The bag holding mechanism is configured to perform air blowing shaping on the sealing tongue of the bag, and to hold the body of the bag and the sealing tongue of the bag after the air blowing shaping; The material bag opening mechanism is configured to cut the sealing tongue of the material bag located at the opening station after the blowing and shaping is completed.

8. The bag opening device according to claim 7, characterized in that: The material bag opening device also includes a material bag conveying mechanism, wherein: The material bag holding mechanism is arranged on the frame and is located at the opening station; The material bag conveying mechanism is used to convey the material bag to the material bag opening station; The bag holding mechanism is configured to perform air blowing shaping on the sealing tongue of the bag conveyed to the opening station, and to hold the body of the bag and the sealing tongue of the bag that has completed the air blowing shaping.

9. The bag opening device according to claim 7, characterized in that: The material bag opening device further comprises a moving mechanism, and the material bag holding mechanism is mounted on a movable part of the moving mechanism; The bag holding mechanism is configured to move to the bag to be opened under the drive of the moving mechanism, and perform air blowing and shaping on the sealing tongue of the bag, and hold the body of the bag and the sealing tongue of the bag that has completed the air blowing and shaping; The material bag holding mechanism is also configured to move the material bag to the opening station under the drive of the moving mechanism.

10. The bag opening device according to claim 7, characterized in that: The bag opening mechanism comprises a clamping portion and a cutting portion, wherein: The clamping part is arranged on the frame and located above the opening station, and the clamping part is configured to clamp the sealing tongue of the material bag from above; after the clamping part clamps the sealing tongue of the material bag, the first pressing member and the second pressing member are configured to release and leave the sealing tongue of the material bag; The cutting part is arranged on the frame, and is configured to cut the sealing tongue of the material bag.

11. The bag opening device according to claim 10, characterized in that: The clamping part includes a third lifting unit and a clamping member, wherein the third lifting unit is arranged on the frame, and the clamping member is connected to the driving end of the third lifting unit; The third lifting unit is configured to drive the clamping member to descend toward the opening station so that the clamping member clamps the sealing tongue of the material bag from above.

12. The bag opening device according to claim 10, characterized in that: The cutting part includes a lifting and adjusting unit, a mounting bracket, a cutter driving unit, a first cutter assembly and a second cutter assembly, wherein: The two ends of the mounting bracket are slidably connected to the frame and are drivingly connected to the lifting and lowering adjustment unit arranged on the frame; The first cutter assembly and the second cutter assembly are slidably connected to the mounting bracket and are respectively connected to the cutter driving unit provided on the mounting bracket, and a cutting space is formed between the first cutter assembly and the second cutter assembly; The lifting and adjusting unit is configured to drive the mounting bracket to descend so that the sealing tongue of the material bag transported to the opening station extends into the cutting space; The cutter driving unit is configured to drive the first cutter assembly and the second cutter assembly to slide toward the middle so that the first cutter assembly and the second cutter assembly are butted against each other to cut the sealing tongue of the material bag.

13. The bag opening device according to claim 12, characterized in that: The cutter drive unit comprises a first cutter drive member and a second cutter drive member, wherein a driving end of the first cutter drive member is connected to the first cutter assembly, and the second cutter drive member is connected to the second cutter assembly; The first cutter driving member and the second cutter driving member are configured to synchronously drive the first cutter assembly and the second cutter assembly to translate in opposite directions, so that the first cutter assembly and the second cutter assembly slide together toward the middle or slide apart toward both sides.

14. The bag opening device according to claim 12, characterized in that: The first cutter assembly comprises a first cutter seat, a first cutter and at least one first stop block, wherein the first cutter seat is slidably connected to the mounting bracket and is transmission-connected to the cutter drive unit, and the first cutter and the first stop block are mounted on the first cutter seat; The second cutter assembly comprises a second cutter seat, a second cutter and at least one second stop block corresponding to the first stop block, wherein the second cutter seat is slidably connected to the mounting bracket and is transmission-connected to the cutter drive unit, and the second cutter and the second stop block are mounted on the second cutter seat; When the cutter driving unit drives the first cutter seat and the second cutter seat to slide toward the middle, the first limit block abuts against the corresponding second limit block, and the first cutter and the second cutter are connected to cut the sealing tongue of the material bag.

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