Cotton bale bagging, sealing and welding device and method and bagging and sealing system

Abstract

The invention discloses a cotton bale bagging, sealing and welding device and method and a bagging and sealing system. The cotton bale bagging, sealing and welding device comprises a sealing rack; a left sealing assembly and a right sealing assembly; a lower sealing assembly; an upper sealing assembly; and a primary welding device. According to the cotton bale bagging, sealing and welding device, the sealing quality is relatively good.

Description

Technical Field

[0001] The present invention relates to a welding device for sealing the cotton bale bag after the cotton bale is bagged, the present invention also relates to a method for welding the bag mouth after the cotton bale is bagged, and the present invention further relates to a bagging and sealing system equipped with the welding device. Background Art

[0002] On the cotton processing production line, after the baling machine bales the cotton bales, the cotton bales need to be bagged. There are mainly two types of cotton bale bags used, one is a cotton cloth bag, and the other is a plastic bag. The emergence of the plastic bag is mainly used to realize the automation of cotton bale bagging. However, the cotton cloth bag is a traditional and widely used bag. At the same time, in order to realize the automatic bagging of the cotton cloth bag, at present, some cotton cloth bags are provided with hot-melt films at the predetermined positions of the bag mouths to facilitate the picking up of the cotton cloth bags. However, the sealing of these cotton cloth bags still currently adopts the method of manual sewing to achieve sealing. Generally speaking, in view of the fact that fewer and fewer workers can be invested in the cotton processing production line, the automation of the cotton processing production process line is an inevitable direction.

[0003] Although the plastic bag is designed for automatic bagging, at present, there is still a lack of automatic sealing equipment for plastic bags, and manual sealing is still the mainstream. It should be known that the cotton bale is relatively large (140×70×53, unit: cm), and its own weight (227±10 kg) is also relatively large. Sealing needs to be achieved at the bag mouth of a 70×53 (unit: cm) cotton bale bag corresponding to the cotton bale. At this time, the cotton bale is located on the bagging machine platform, and the width of the bagging machine platform is usually greater than 100 cm. It is relatively difficult for workers to sew the bag mouth on-site by sewing.

[0004] At present, there is another sealing method for plastic bags after the cotton bale is bagged, that is, the bagged cotton bale is transported to the welding station. At the welding station, first, the worker stacks the bag mouth of the plastic bag in a predetermined manner, and then the worker holds a heating device similar to an iron to iron the stacked bag mouth to melt and weld the stacked bag mouth part. As mentioned above, for the cotton bale, it is usually transported in a state with the large surface facing down on the production line to ensure the stability during transportation. The so-called large surface is the cotton bale surface of 140×70 (unit: cm), which is equivalent to the cotton bale lying horizontally. It is relatively difficult for workers to iron the bag mouth. At the same time, the heating device generally remains in the heating state continuously. In order to avoid inducing a fire due to this, there are strict requirements for the storage position of the heating device on-site, but non-standard operations cannot be avoided. Especially now, young people are not willing to work on the front line, and most of the workers on-site are relatively older, and lack of energy leads to the heating device not being turned off or placed in an inappropriate position, and there may be some potential fire hazards due to this.

[0005] In some implementations, two cotton bale outer bags are substantially used to seal the bale. Specifically, first, one cotton bale outer bag is put on the cotton bale from one end of the cotton bale, and then another cotton bale outer bag is put on the cotton bale from the other end of the cotton bale. The two cotton bale outer bags are relatively shorter than the traditional cotton bale outer bags. The two cotton bale outer bags overlap in the middle of the cotton bale. Finally, an automatic bundling device is used to bundle at the overlapping position in the middle, thus completing the sealing. This method completely overcomes the problems of inconvenient operation and low efficiency caused by manual sewing. However, if the first cotton bale outer bag is not fixed, it is very easy for the first cotton bale outer bag to come off when the second cotton bale outer bag is put on. Therefore, in order to ensure the position locking of the first cotton bale outer bag, it is necessary to bundle the mouth of the first cotton bale outer bag once after the first cotton bale outer bag is put on, and then the second cotton bale outer bag can be put on. During this process, the cotton bale needs to move back and forth multiple times at three workstations in two directions (the directions of the two bagging operations are different), resulting in low efficiency. At the same time, due to the existence of multiple workstations, the configured bagging and sealing system structure is too complex.

[0006] It should be known that after the cotton bale is put into the cotton bale outer bag, there will be a certain margin at the mouth of the cotton bale outer bag for sealing. In view of this, in a relatively newer technology, a pair of pneumatic fingers (a standard actuator, also known as a pneumatic gripper) are first used. When the cotton bale after bagging is pushed in place, one pneumatic finger on each side of the current cotton bale bag mouth respectively clamps the bag mouth from the corresponding side and pulls it to both sides. At this time, the flexible bag mouth will be flattened and the upper and lower bag surfaces will be attached. Then, a device with upper and lower clamping plates is provided to clamp the flattened bag mouth from above and below, and then a heater is used to weld the clamped bag mouth together. At this time, the bag mouth forms a sheet-like structure roughly parallel to the upper and lower bag surfaces, and then the bag mouth is folded down or up to fit on the bag mouth surface, and then secondary welding is carried out, so that the sheet-like structure is tightly welded to the bag surface of the cotton bale outer bag at this end. This method can achieve relatively comprehensive automatic sealing. However, it is relatively difficult to attach the upper and lower bag surfaces at the bag mouth by pulling, because it is difficult to control the shape of the upper and lower bag surfaces of the bag mouth in the pulling state, and the welding length is greater than the width of the bag mouth, resulting in a large amount of welding and difficult configuration of the welding equipment. At the same time, a relatively long bag corner will be generated after pulling, which not only has poor aesthetics but also affects the storage and transportation of the cotton bale. In addition, although the bag mouth can be tightened based on clamping, when the sheet-like structure is folded up or down, it is easy to wrinkle the bag surface on the folding direction side, resulting in difficult control of the welding area of the folded sheet-like structure and affecting the sealing quality. Summary of the Invention

[0007] The object of the present invention is to provide a cotton bale bag sealing and welding device with relatively good sealing quality. The present invention also provides a welding method using the cotton bale bag sealing and welding device, and the present invention further provides a bag packaging and sealing system equipped with the cotton bale bag sealing and welding device.

[0008] According to the first aspect of the embodiments of the present invention, there is provided a cotton bale bag sealing and welding device, including: A sealing machine frame having a platform for supporting the cotton bale after bag packaging, and the platform has an up-and-down channel corresponding to the rear side of the currently placed cotton bale; A left sealing assembly and a right sealing assembly, located on the left and right sides of the platform, to push and close the bag mouth from the left and right sides of the cotton bale bag, so that the left and right bag surfaces at the bag mouth are folded onto the rear end face of the cotton bale; A lower sealing assembly, located below the platform, and the lower sealing component of the lower sealing assembly penetrates upward from the up-and-down channel to push and close the lower bag surface at the bag mouth upward onto the rear end face of the cotton bale; An upper sealing assembly, located above the platform, to push and close the upper bag surface at the bag mouth downward onto the rear end face of the cotton bale; and A primary welding device having a primary welding component, a first driving device for driving the primary welding component to run in the front-rear direction of the cotton bale, and a second driving device for driving the primary welding component to change between a first position and a second position; wherein the first position is the position where the primary welding component is located behind the rear bag surface of the cotton bale, and the second position is the position disengaged from the travel path of the cotton bale; when the primary welding device is in the first position, the primary welding component is on the folded overlapping area remaining after the folded bag surfaces of each sealing assembly are in place.

[0009] Optionally, the sealing components provided by the left sealing assembly and the right sealing assembly are sealing plates, the sealing plates are symmetrically structured up and down, and one end opposite between the corresponding two sealing plates is a tapered leading part.

[0010] Optionally, the top of the tapered leading part is an arc head.

[0011] Optionally, the component for pushing the sealing plate to move in the left-right direction is a linear driving mechanism or a linear driving component.

[0012] Optionally, the linear driving mechanism is selected from a synchronous belt mechanism, a transmission chain mechanism, a lead screw and nut mechanism or a rack and pinion mechanism; The linear driving component is selected from a cylinder, a hydraulic cylinder, a linear motor or an electric push rod.

[0013] Optionally, the frame of the linear driving mechanism or the seat part of the linear driving component is hinged to the corresponding side of the sealing machine frame through a rotating shaft perpendicular to the platform; Provide a swing drive device for driving the swing of the rack or seat part, so as to swing the corresponding linear drive mechanism or linear drive component out of the bale pushing path.

[0014] Optionally, the swing drive device is a swing cylinder, a swing motor, a rack and pinion mechanism or a triangular mechanism.

[0015] Optionally, alignment frames are arranged on both sides of the bale conveying path to guide the pushed bales to the middle in the left - right direction of the platform.

[0016] Optionally, the alignment frame includes a guiding plate on the bale inlet side and a main guiding plate connected to the guiding plate; A conical inlet is defined between the guiding plates corresponding to the left and right sides; The two main guiding plates corresponding to the left and right sides are parallel to each other.

[0017] Optionally, a reinforcing plate is arranged on the back side of the guiding plate; This back side is the side opposite to the working surface of the guiding plate.

[0018] Optionally, the upper and lower plate edges of the guiding plate have flanges turned up towards the back side.

[0019] Optionally, the left sealing assembly and the right sealing assembly are installed on the alignment frame.

[0020] Optionally, the primary welding device is installed on the upper sealing assembly.

[0021] Optionally, the upper sealing assembly is provided with a bag lifting device to lift the upper surface of the bag mouth of the bale sleeve bag before the left and right sealing assemblies and the lower sealing assembly are in place.

[0022] Optionally, the lower part of the upper sealing plate equipped on the upper sealing assembly is a U - shaped plate body or a sealing plate body with a rectangular opening; Correspondingly, the primary welding assembly is located at the U - shaped opening or the rectangular opening to weld the position determined by the U - shaped opening or the rectangular opening of the folded overlapping area.

[0023] Optionally, it further includes a secondary welding device located on the sealing frame to perform secondary welding on the folded overlapping area after the corresponding sealing assembly is reset; the secondary welding device includes: A secondary welding assembly; A third drive device to drive the secondary welding component in the secondary welding assembly to run in the front - back direction of the bale; A fourth drive device to drive the conversion of the secondary welding assembly between the third position and the fourth position. When the secondary welding assembly is in the third position, the secondary welding component is aligned with the folded overlapping area; when the secondary welding assembly is in the fourth position, the secondary welding assembly moves away from the bale running path.

[0024] Optionally, the welding area of the secondary welding assembly is greater than or equal to that of the primary welding assembly; If they are equal, the position of the secondary welding is misaligned with that of the primary welding; If it is greater, the position of the secondary welding is misaligned with or covers the position of the primary welding.

[0025] Optionally, a limiting device for pressing the folded bag surface or blocking the folded bag surface when the third driving device retracts is provided on the secondary support equipped with the secondary welding device.

[0026] Optionally, there are multiple secondary welding plates in the secondary welding assembly, and there are spacing gaps between the multiple plates; The limiting device is a fixed rod arranged on the running path before and after the spacing gap.

[0027] Optionally, the secondary welding device is located on the front side of the sealing machine frame, and the primary welding device is located on the rear side of the sealing machine frame.

[0028] According to the second aspect of the embodiments of the present invention, a welding method using the cotton bale bag sealing and welding device described in the first aspect of the embodiments of the present invention is provided. The welding method includes the following steps: 1) The cotton bale after bagging is conveyed to the first position of the platform; 2) The left sealing assembly and the right sealing assembly act synchronously to push the left and right bag surfaces of the open cotton bale bag mouth towards each other and fit them to the rear end face of the cotton bale; 3) The lower sealing assembly pushes the lower bag surface of the cotton bale bag mouth upwards to fit it to the rear end face of the cotton bale; 4) The upper sealing assembly pushes the upper bag surface of the cotton bale bag mouth downwards to fit it to the rear end face of the cotton bale; 5) Perform primary welding on the exposed part of the overlapping area of each bag surface at the rear end face of the cotton bale relative to each sealing assembly; 6) Each sealing assembly resets.

[0029] Optionally, during primary welding, multiple contact hot melts are used, and there is an interval of 1 to 5 s between adjacent times.

[0030] Optionally, after each sealing assembly resets, secondary welding is performed on the overlapping area; This secondary welding is either stagger-welded with the primary welding or the secondary welding covers the primary welding; When the secondary welding covers the primary welding, the area of the secondary welding is 2 to 4 times that of the primary welding.

[0031] According to the third aspect of the embodiments of the present invention, a bagging and sealing system is provided, which is equipped with the cotton bale bag sealing and welding device described in the first aspect of the embodiments of the present invention.

[0032] It should be known that, whether it is a cotton cloth bag or a plastic bag, after the cotton bale is bagged, a part of the bag body will be left to meet the sealing of the cotton bale bag. For the cotton cloth bag, the cotton cloth bag with a hot melt film at the bag mouth is applicable to the embodiments of the present invention to adapt to hot melt welding. Since the length of the remaining bag mouth part is not long, when it is moved to the welding platform after bagging, due to the tension of the bag mouth part itself and the supporting effect of the cotton bale, the left and right side bag surfaces at the bag mouth are basically in an open state, the lower bag surface is basically attached to the platform, and there will be some collapse edges on the upper bag surface, especially for the cotton cloth bag, and the plastic bag has less collapse edge phenomenon.

[0033] Furthermore, the cotton bale bag sealing and welding device according to the embodiments of the present invention includes a left sealing assembly and a right sealing assembly, which move synchronously approximately. At the bag mouth, they push the left side bag surface and the right side bag surface inward from the left and right sides until they fit against the rear end face of the cotton bale. At this time, affected by the folding of the left and right side bag surfaces, even without the assistance of other devices, the collapse edge phenomenon of the upper bag surface will be weakened. At this time, the upper bag surface can be folded, or the lower bag surface can be folded first, and then the upper bag surface can be folded. Finally, the four bag surfaces of the bag mouth are folded inward onto the rear end face of the cotton bale. Under the condition of being pressed by the four sealing assemblies, the folded state is maintained well, and at this time, a folded overlapping area will be generated, that is, there is a partial overlap of the four bag surfaces. Based on the concept of the present invention, when all the sealing assemblies are pressed on the rear end face of the cotton bale, a part of the folded overlapping area that is not pressed should be left to perform a welding so that at least the remaining part of the folded overlapping area forms a hot melt welded body. Based on the foregoing description, based on the coordinated cooperation of one sealing assembly in each of the four directions, the four bag surfaces of the bag mouth can be better folded onto the rear end face of the cotton bale, and then hot melt welding can be performed. The overall quality is controllable, and it is not easy to cause sealing defects or failures due to this. And because these folding methods can better fold the bag mouth bag surface onto the rear end face of the bread, the appearance quality is better, and there is no remaining bag corner, which is more suitable for storage and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of a cotton bale bag sealing and welding device in an embodiment.

[0035] Figure 2 It is a schematic structural diagram of a lower sealing assembly in an embodiment.

[0036] Figure 3 It is a schematic structural diagram of a lower sealing plate in an embodiment.

[0037] Figure 4 It is an exploded view of a cotton bale bag sealing and welding device in an embodiment.

[0038] Figure 5 It is a schematic structural diagram of a right alignment frame in an embodiment.

[0039] Figure 6 Schematic diagram of the right sealing assembly structure in an embodiment.

[0040] Figure 7 Schematic diagram of the left sealing assembly structure in an embodiment.

[0041] Figure 8 Schematic diagram of the lifting assembly structure with a primary welding component installed in an embodiment.

[0042] Figure 9 Schematic diagram of the primary welding component structure in an embodiment.

[0043] Figure 10 Schematic diagram of the secondary welding assembly structure in an embodiment.

[0044] Figure 11 Schematic diagram of the secondary heating welding plate module structure in an embodiment.

[0045] In the figure: 1. Lower sealing assembly, 2. Left sealing assembly, 3. Right alignment frame, 4. Primary welding component, 5. Upper sealing assembly, 6. Frame body, 7. Left sealing assembly, 8. Left alignment frame, 9. Secondary welding assembly.

[0046] 11. First seat plate, 12. First lifting cylinder, 13. First lifting guide rail, 14. Lower sealing plate, 15. Lower relief opening, 16. First fixing hole, 17. U-shaped opening, 15. Lower relief opening, 18. First connecting seat.

[0047] 21. Right sealing plate, 22. Right push rod, 23. Right sealing cylinder, 24. Right flap, 25. Right crank arm, 26. Right turning cylinder, 27. Second long hole, 28. Right fixing plate.

[0048] 31. Right guiding plate, 32. First reinforcement plate, 33. Flange, 34. Right main guiding plate, 35. Second reinforcement plate, 36. First long hole, 37. Second connecting seat.

[0049] 41. Primary welding cylinder, 42. Primary mounting seat, 43. Primary welding slider, 44. Primary welding guide rail, 45. Primary welding component, 46. Primary pressing plate.

[0050] 51. Upper sealing plate, 52. Second seat plate, 53. Second lifting cylinder, 54. Second lifting guide rail, 55. Second lifting slider.

[0051] 71. Left turning cylinder, 72. Left fixing plate, 73. Left sealing cylinder, 74. Left crank arm, 75. Left shaft seat, 76. Left shaft, 77. Left push rod, 78. Left sealing plate.

[0052] 91. Lower body, 92. Guide rod, 93. Linear shaft extractor, 94. Secondary welding cylinder, 95. Secondary welding bracket, 96. Third lifting guide rail, 97. Third lifting cylinder, 98. Anti-reverse rod, 99. Secondary heating welding plate module.

[0053] 451. Anti-collision rubber pad, 452. Top edge suction cup, 453. Suction cup seat, 454. Sub-bracket, 455. Main bracket, 456. Primary heat insulation mounting seat, 457. Primary heating welding plate block.

[0054] 991. Module frame plate, 992. Connecting rod, 993. Connecting aluminum plate, 994. Mica heat insulation plate, 995. Asbestos heat insulation plate, 996. Heating welding plate, 997. Spacing gap. Specific implementation mode

[0055] It should be known that in the technical field of cotton bale wrapping, there are definite front, back, left and right directions. Generally speaking, taking the conveying direction of the cotton bale as the front and back directions of the cotton bale bagging and sealing welding device. Figure 1 In it, when the secondary welding assembly 9 is welded, the guiding direction of the guide rod 92 configured, and this guiding direction is the front and back direction.

[0056] Furthermore, generally in the mechanical field, the front and back directions are also called the longitudinal direction, the long direction or the head and tail direction. And it should be known that based on this reference system, for example, the direction in which the cotton bale advances is the forward direction, and vice versa is the backward direction. Therefore, in the standard cotton bale in this field, the length × width × height is usually expressed as 140×70×53, unit: cm. In the bagging and sealing system, in order to ensure the stability of conveying, for the two surfaces of the cotton bale defined by 140×70, one is the bottom surface, which is used to contact the conveying platform, roller path, etc. of the cotton bale bagging and sealing system, and the other is the top surface. And the two surfaces defined by 140×53 are the two side surfaces of the cotton bale, corresponding to the left and right sides of the bagging and sealing system. The remaining two surfaces are defined by 70×53, constituting the front end surface and the rear end surface of the cotton bale.

[0057] Since during bagging, the mouth of the cotton bale bag with the bottom sealed faces backward, the cotton bale bag is usually first put on a generally tubular bagging device. When the cotton bale passes through the bagging device, it is smoothly put into the cotton bale bag. At this time, the head of the cotton bale enters the cotton bale bag and usually contacts the bottom of the sealed cotton bale bag. At this time, it should be known that when the cotton bale is put into the bag, there will still be a section of the bag body left at the rear of the cotton bale bag to meet the basic requirements of sealing.

[0058] After being sleeved, it can be sealed in place, or the sleeved bale can be conveyed to a given platform for sealing. As mentioned above, there are mainly two types of bale sleeves suitable for hot melt (welding) automatic sealing at present. One is a plastic sleeve, and the other is a cotton cloth sleeve with hot melt adhesive at the bag mouth. With the development of technology, there will be more and more bale sleeves suitable for hot melt automatic sealing. It can be seen that the plastic sleeve itself belongs to the hot melt type sleeve, while for the cotton cloth sleeve, it is required that its bag mouth is provided with hot melt adhesive, generally such as a glue-impregnated bag mouth or a partial glue-impregnated or glue-coated structure, but all are suitable for using a hot melt welding device for sealing operations.

[0059] In addition, for the convenience of description, a reference plane is determined based on the bale support table, such as the platform installed or provided by the sealing machine frame that can support the bale during sealing. The direction perpendicular to the front-back direction within the reference plane is called the left-right direction. The left-right direction is often referred to as the lateral direction in some applications. In addition, the left-right direction is also called the transverse direction and the width direction. In the embodiments of the present invention, the reference plane is a virtual concept, only used to describe the plane determined by the front, back, left, and right, rather than a specific surface of a certain component. Although in the art, the platform of the bale is usually used as the design basis, although the support height of the bale may change slightly when it rotates through each work station, determining the reference plane based on the front, back, left, and right does not affect the correct understanding of those skilled in the art.

[0060] Generally, the direction perpendicular to the reference plane is also called the height direction. The height direction does not represent the plumb direction. In the mechanical field, a relative concept is more often used to represent height, especially when corresponding to up and down.

[0061] It should be noted that the bale sleeve sealing and welding device is usually a process device of the sleeving and sealing system. It should be known that in the mechanical field, the relevant components on the process device do not necessarily have a connection relationship only within this set of process devices. These relevant components can also be installed on any adjacent machine frame on the line, or adjacent process devices, and the conveying devices for the workpiece to flow between adjacent process devices. Therefore, in the embodiments of the present invention, the focus is on describing the positional relationship, and less on the connection relationship. Because those skilled in the art can purposefully select the connection relationship based on the positional relationship. In other words, the positional relationship is more definite content, while the connection relationship is more content that can be selected. And under the condition that the positional relationship is clear, most of them can be determined without creative labor.

[0062] Relatively speaking, the sealing process device is often the end process setting of the sleeving and sealing system. Although there may be, for example, a coding device in some embodiments, the overall main process steps have been completed.

[0063] In an embodiment of the present invention, both the cotton bale sleeve bag used in the cotton bale sleeve bag sealing and welding device and an ordinary bag body are bags with an opening. The cotton bale sleeve bag usually has upper and lower bag surfaces, left and right bag surfaces, and a bottom bag surface, and is made into a rectangular tube structure during production. In the storage and transportation state, the left and right bag surfaces of the cotton bale sleeve bag are folded in the middle and presented in a sheet shape. After the cotton bale is put into it, the left and right bag surfaces are stretched open. At the bag opening, the lower bag surface is basically attached to the bagging platform (hereinafter simply referred to as the platform). Due to the support of the cotton bale, the left and right bag surfaces are generally presented in the form of vertical walls. Affected by gravity, the upper bag surface often has a phenomenon of edge collapse in the middle. Especially for cotton cloth sleeve bags, although other methods such as film laminating and dipping are used to make the bag opening have a certain stiffness, the upper bag surface of the cotton cloth sleeve bag often has relatively obvious edge collapse.

[0064] Relatively speaking, at the bag opening, the folding conditions of the left and right bag surfaces and the lower bag surface are relatively good, while the folding conditions of the upper bag surface are relatively poor. Therefore, in a preferred embodiment, the left and right bag surfaces and the lower bag surface can be folded first. Among the three bag surfaces, the left and right bag surfaces can be folded synchronously, and the lower bag surface can be folded later. Especially for plastic sleeve bags, the folding line during storage and transportation is usually the upper and lower symmetric center lines on the side of the plastic sleeve bag, which is more conducive to symmetric folding of the left and right sides by means of this center line. This symmetry especially includes up and down symmetry.

[0065] In Figure 1 and Figure 2 The platform for supporting the cotton bale is not shown in the illustrated structure, but it should be understood that in the embodiment of the present invention, the description focuses on the sealing part, and the conventional structures in this field such as the platform will not be elaborated further.

[0066] Figure 1 and Figure 4 The frame 6 shown in

[0067] is a beam frame structure, generally can be a welded structure of section steel, and serves as the sealing machine frame. The remaining components of the cotton bale sleeve bag sealing and welding device are mainly installed on the frame 6 as the installation body. However, as mentioned above, since the bagging and sealing system is usually designed as a whole, it is a general design method in this field to install the components on one process equipment on other process equipment, mainly depending on factors such as the overall structural compactness and assembly interference.

[0068] To meet the actuation of the lower sealing assembly 1, the platform has an upper and lower channel corresponding to the rear side of the currently positioned bale, so that the folding working component of the lower sealing assembly 1 can be lifted and lowered through this upper and lower channel. As for the roller platform described above, there is often a certain gap between adjacent rollers. In other words, the gap between the rollers can form the upper and lower channels under the condition of meeting the requirement for the up and down passage of this working component of the lower sealing assembly 1.

[0069] For the sake of convenient description, the left sealing assembly 7, the right sealing assembly 2, the lower sealing assembly 1 and the upper sealing assembly 5 are collectively referred to as the sealing assemblies. Among them, in some embodiments, the left sealing assembly 7 and the right sealing assembly 2 are arranged symmetrically on both sides of the platform. Here, the symmetry is about the left and right middle plane of the platform. The main consideration for arranging the left sealing assembly 7 and the right sealing assembly 2 in a symmetrical manner is the situation where the left sealing assembly 7 and the right sealing assembly 2 synchronously fold the corresponding side bag surfaces at the bag mouth.

[0070] Furthermore, in some embodiments, the left sealing assembly 7 and the right sealing assembly 2 are intervened successively. When folding the corresponding side bag surfaces successively, the left sealing assembly 7 and the right sealing assembly 2 can be different. Generally, the working component that intervenes first is relatively larger.

[0071] The left sealing assembly 7 and the right sealing assembly 2 push the bag mouth together from the left and right sides of the bale bag mouth, so that the left and right bag surfaces at the bag mouth are folded to the rear end face of the bale. At this time, the left sealing assembly 7 and the right sealing assembly 2 stop running and maintain the state of the left and right bag surfaces at the folded bag mouth.

[0072] The lower sealing assembly 1 is located below the platform. The lower sealing component of the lower sealing assembly 1 penetrates upward from the upper and lower channels to push the lower bag surface at the bag mouth upward from the lower side of the bale bag mouth to the rear end face of the bale. At this time, the lower sealing assembly 1 also stops running and maintains the state of the lower bag surface at the currently folded bag mouth.

[0073] It should be noted that if the left sealing assembly 7 and the right sealing assembly 2 are in place in advance, the lower bag surface at the bag mouth folded upward by the lower sealing assembly 1 may press on the sealing components of the left sealing assembly 7 and the right sealing assembly 2. The above content about folding the lower bag surface at the bag mouth to the rear end face of the bale is only used to describe this folded state, and does not indicate the existence of a joint relationship between the bag surface at the folded bag mouth and the rear bag surface of the bale.

[0074] Similarly, if the lower bag surface at the bag mouth is folded first and then the left and right bag surfaces at the bag mouth are folded, there will also be a problem of successive folding. As a result, the later folded bag surface often presses on the previously folded bag surface. This overlapping of the folded bag surfaces is exactly what the present invention expects to produce and is also achievable by the remaining bag segment at the bag mouth according to the principle of the present invention. At this time, the folded bag surface is generally parallel to the rear end face of the bale, but does not indicate a joint.

[0075] Regarding the upper sealing assembly 5, it is located above the platform and is used to push the upper bag surface at the bag mouth downward from the upper side of the cotton bale bag mouth to the rear end surface of the cotton bale. As described above, considering that when sealing, it is necessary to ensure that the bag surface length at the bag mouth part remaining after wrapping the cotton bale meets the sealing requirements. At this time, there will inevitably be an overlapping area between the upper and lower bag surfaces and the left and right bag surfaces at the bag mouth. At the same time, it should be known that, just like folding a piece of paper, when folding the paper, it is not necessary for the part used for folding to completely cover half of the paper. Similarly, for the overlapping area, the sealing assembly does not need to completely cover it, and an area where other components can act can be left. This area can be called the welding selection area, and a predetermined area can be selected in this welding selection area for hot melt welding.

[0076] It should be known that the overlapping here refers to the overlapping part between the bag surfaces. At the same time, it should be known that overlapping does not mean that a certain bag surface at the bag mouth must have an overlapping relationship with the other bag surfaces. Simply for connecting the seal, if there are connection relationships due to welding between the left bag surface and the upper and lower bag surfaces at the bag mouth, and the same is true for the right bag surface. At this time, even if there is no direct connection relationship between the left bag surface and the right bag surface, the reliability requirements can be met by means of the connection with the upper and lower bag surfaces for sealing.

[0077] Provide a primary welding device, which has a primary welding assembly 4, a first driving device for driving the primary welding assembly 4 to run in the front-rear direction of the cotton bale, and a second driving device for driving the primary welding assembly 4 to transform between a first position and a second position; the primary welding assembly 4 has two degrees of freedom accordingly, so as to realize the movement of the welding assembly 4 by means of the first driving device and the second driving device.

[0078] The first position is the position where the primary welding assembly 4 is located behind the rear bag surface of the cotton bale, and the second position is the position where it disengages from the travel path of the cotton bale, that is, to avoid the normal transportation of the cotton bale, or to avoid movement interference. In principle, the primary welding assembly 4 only needs to get out of the way of the transportation path of the cotton bale, which is the first thing to ensure. For other design influencing factors, those skilled in the art can adjust according to the overall design requirements.

[0079] Furthermore, when the primary welding device is in the first position (used to represent the state), the primary welding assembly 4 welds the remaining folded overlapping area after the folded bag surfaces of each sealing assembly are in place. Here, the remaining can be understood as the part of the folded overlapping area that is not covered by, for example, the right sealing plate 2, the left sealing plate 78, the lower sealing plate 14, and the upper sealing plate 51. Furthermore, when the primary welding device is in the first position, under the drive of the first driving device, the primary welding assembly 4 can weld the remaining folded overlapping area.

[0080] As described above, if one-time welding can meet the sealing requirements, secondary welding may not be necessary. Also as previously mentioned, when the right sealing plate 2, left sealing plate 78, lower sealing plate 14, and upper sealing plate 51 are welded once, a relatively large area will be covered, and this covered area includes part of the folded overlapping area. One-time welding may, under certain conditions such as the lower relief opening 15 of the lower sealing plate 14 shown in Figure 2 , enable the shape and area of the remaining folded overlapping area to fully meet the sealing requirements, and in this case, secondary welding may not be necessary. However, more often, due to the limitations of the shapes of the sealing plates and the requirements for folding the bag surface, the remaining folded overlapping area is not well-positioned and is not large enough in area, resulting in one-time welding not being sufficient to meet the sealing requirements. Therefore, in a preferred embodiment, one-time welding is more similar to spot welding in the field of welding technology, that is, an initial connection is first generated by spot welding, and then, for example, full welding is performed to make the overall weld meet the design requirements.

[0081] In view of this, secondary welding can be a better choice. Thus, in a preferred embodiment, a secondary welding device is provided to improve the overall sealing quality. Also as previously mentioned, since one-time welding is similar to spot welding in some embodiments, an initial connection is formed at the bag opening. At this time, each sealing assembly does not have to keep pressing on the corresponding bag surface. After each sealing assembly is reset, the bag surface at the sealing position is fully exposed, and thus the corresponding folded overlapping area will also be fully exposed, making the secondary welding device have better and more comprehensive welding conditions.

[0082] Next, the mechanism for implementing the inventive concept will be described based on the welding conditions. First, in the embodiments of the present invention, there are many choices regarding the folding sequence of each bag surface at the bag opening. However, in a preferred embodiment, there can be a better choice for the folding sequence of each bag surface at the bag opening. In this better choice, the left and right bag surfaces at the bag opening are folded synchronously as the first step, then the lower bag surface at the bag opening is folded, and finally the upper bag surface at the bag opening is folded.

[0083] To ensure that the sealed shape after folding is relatively regular and to provide better conditions for subsequent folding, the sealing components provided by the left sealing assembly 7 and the right sealing assembly 2 are sealing plates, such as Figure 6 the right sealing plate 21 shown in Figure 7 and the left sealing plate 78 shown in. Collectively, they are called sealing plates. For distinction, the left sealing plate 78 and the right sealing plate 21 can be collectively called side sealing plates. In a preferred embodiment, the side sealing plates are symmetrically structured up and down, and the opposite ends between the left sealing plate 78 and the right sealing plate 21 are tapered leading parts. When in the sealed state, the sealing plates are substantially parallel to the rear end face of the cotton bale, thus producing a pushing-forward and pressing-backward effect. That is, for example, for the left sealing plate 78, its right edge first engages with the left bag surface at the bag opening, and during the rightward movement of the left sealing plate 78, it pushes the left bag surface at the bag opening to the right and presses it down.

[0084] The same applies to the right sealing plate 21.

[0085] Specifically, as Figure 6 shown, in the working state, the left end of the right sealing plate 21 is a conical leading part. When it moves from right to left, the conical leading part first presses the middle of the right bag surface near the rear end surface of the cotton bale at the bag mouth. When the right sealing plate 21 moves further to the left, an indentation similar to the shape of the leading part will be generated on the right bag surface, causing a part of the right bag surface at the bag mouth to form a wedge-shaped part that folds to the rear end surface of the cotton bale. Except for the leading part, the right sealing plate 21 can be understood as a rectangular plate, and the vertical dimension of this rectangular plate can be approximately the same as the height of the rear end surface of the cotton bale, or slightly smaller. Thus, during the leftward movement of the right sealing plate 21, part of the right bag surface folds with the upper bag surface, and part of the right bag surface folds with the lower bag surface, so that overlapping trapezoidal waist edges are formed on both the upper bag surface and the lower end surface at the bag mouth.

[0086] The same applies to the left sealing plate 78.

[0087] Furthermore, from Figure 6 the illustrated structure, it can be seen that the right sealing plate 21 with a leading part is generally in an isosceles triangle structure. Furthermore, in order to prevent the leading part from scratching the bag surface, the top of the leading part is rounded, thus forming an arc head. This arc head can be a circular arc head or other types of arc heads.

[0088] The basic movement form of the corresponding side sealing plate is linear motion. Therefore, a linear drive mechanism can be used to drive the side sealing plate, or a linear drive component can be used to drive the side sealing plate.

[0089] Compared with the linear drive component, the linear drive mechanism only lacks a power machine. For example, a synchronous belt mechanism, a transmission chain mechanism, a nut-screw mechanism, or a rack and pinion mechanism all need to be equipped with a power machine, such as an electric motor, etc., to drive the rotation of the driving pulley in the synchronous belt mechanism. Then, by means of the connection between the synchronous belt and the side sealing plate, and in cooperation with the guide rail pair, the linear drive of the side sealing plate is realized.

[0090] In view of the above, the linear drive mechanisms are all common linear drive mechanisms in the mechanical field, and how they achieve linear drive also belongs to the general knowledge in the mechanical field, so it will not be elaborated here.

[0091] Since the drive form is relatively simple, especially the drive of the side sealing plate belongs to a relatively light-load drive, therefore, directly selecting a linear drive component is a better choice, especially a cylinder is a better choice, such as Figure 6 the right sealing cylinder 23 used to drive the right sealing plate 21 in Figure 7 and the left sealing cylinder 73 used to drive the left sealing plate 78 in

[0092] Relatively speaking, such as a hydraulic cylinder, a hydraulic cylinder is suitable for applications with heavy loads and stable operation. The defect is that it is easy to cause pollution due to leakage, and the response speed is relatively slow.

[0093] For other linear drive components such as linear motors and electric push rods and their configuration methods, they all belong to the general knowledge in this field and will not be elaborated here.

[0094] In addition, in the embodiments of the present invention, there are multiple components using linear drive. The above descriptions about linear drive can all be referred to and applied, and the remaining components used to achieve linear motion will not be repeatedly described.

[0095] From Figure 4 it can be seen that in the left sealing assembly 7 and the right sealing assembly 2, since there are moving components in the left-right direction, the driven component in the left-right moving components is the side sealing plate. Under this condition, when the cotton bale after wrapping is fed to the platform, the side sealing plate needs to completely give way to the path of cotton bale transportation. If the left sealing assembly 7 and the right sealing assembly 2 are completely stored by moving left and right, it will cause the left sealing assembly 7 and the right sealing assembly 2 to occupy a large lateral space after resetting. Therefore, in the preferred embodiment, the left sealing assembly 7 and the right sealing assembly 2 are swung to both sides of the sealing frame by a swinging method, so as to reduce the occupation of the lateral space of the sealing frame.

[0096] Furthermore, taking the frame of the linear drive mechanism or the seat part of the linear drive component as the swing frame, this swing frame is hinged to the corresponding side of the sealing frame through a rotating shaft perpendicular to the platform. Based on the swing of the swing frame, a horizontally placed linear drive mechanism and a driven component such as the right sealing plate 21 driven by this linear drive mechanism can be swung to the longitudinal position, so as to make full use of the useless longitudinal space while giving way to the lateral space.

[0097] Correspondingly, a swing drive device is provided for driving the swing of the frame or the seat part to swing the corresponding linear drive mechanism or linear drive component out of the cotton bale pushing path. And as mentioned above, swinging out is just a general option, and swinging to the longitudinal position is a relatively better further option.

[0098] Correspondingly, the swing drive device is a swing cylinder, a swing motor, a rack and pinion mechanism or a triangular mechanism. In Figure 6 and Figure 7 the exemplified structure, a triangular mechanism driven by a tilting cylinder is adopted. For example, Figure 7 in the storage of the left sealing plate 78 shown in the figure, in the figure, the left sealing cylinder 73 that drives the left sealing plate 78 to move linearly is installed on the left shaft seat 75 provided on the left fixing plate 72 through the left shaft 76. The axis of the left shaft 76 is perpendicular to the platform and is a vertical shaft in more applications.

[0099] Furthermore, a left turning arm 74 is installed on the left shaft 76. The left turning arm 74 is perpendicular to the left shaft 76, and the two are fixedly connected. A left turning cylinder 71 is provided. The seat end of the left turning cylinder 71 is hinged on the left fixing plate 72, and the push rod of the left turning cylinder 71 is hinged to the end of the left turning arm 74, thus forming a triangular mechanism to achieve the swing of the left sealing cylinder 73 for the storage of the left sealing assembly 7.

[0100] Regarding swinging, there are many swinging mechanisms and swinging components in the mechanical field. Common swinging components include swinging cylinders and swinging motors. Common mechanisms that can output swinging also include, for example, the rack and pinion mechanism. The movement of the gear meshing with the rack can be driven by the linear movement of the rack to achieve the swing of the gear.

[0101] Regarding the mechanisms, components, and configuration methods for achieving swinging in the mechanical field, they all belong to the general knowledge of the mechanical field and will not be elaborated here.

[0102] The above method for storing the left sealing assembly 7 is equally applicable to the right sealing assembly 2 and will not be elaborated here.

[0103] In order to improve the quality of sealing, in some embodiments, alignment frames are provided on both sides of the cotton bale conveying path on the platform to guide the pushed cotton bales to the middle in the left - right direction of the platform. The alignment frame includes a left alignment frame 8 and a right alignment frame 3, which can be symmetric about the left - right middle plane of the platform to guide the cotton bales to the middle position in the left - right direction.

[0104] Take Figure 5 the right alignment frame 3 shown as an example to illustrate the structure of the alignment frame. As can be seen in the figure, the main body of the right alignment frame 3 has a right guiding plate 31 and a right main guiding plate 34. In some embodiments, the two are an integral structure and can be formed by bending a steel plate. The right main guiding plate 34 is parallel to the left and right sides of the cotton bale in the ideal state of being in place, and the corresponding left main guiding plate is parallel to the right main guiding plate 34.

[0105] Furthermore, the right guiding plate 31 extends outward relative to the right main guiding plate 34, thus cooperating with the corresponding left guiding plate to form a tapered guiding inlet. Obviously, the right guiding plate 31 is located at the rear end of the right main guiding plate 34.

[0106] When a cotton bale with a poor position in the left - right direction is conveyed to the left - right alignment frame, the current cotton bale will contact the guiding plate on the side where it is skewed and be guided to correct the deviation, and finally be guided into the space between the two main guiding plates.

[0107] In the front - rear direction, the alignment frame does not need to be too long. Its overall length of not less than 20 cm can basically meet the deviation - correction requirements. Usually, a length of 25 cm - 32 cm has a relatively good deviation - correction effect. An overly long alignment frame will occupy a large space and is not necessary.

[0108] It should be known that the self-weight of a standard cotton bale is 227 ± 10 kg. Since rectification often requires a relatively large reaction force, the guiding plates should have good rigidity. Thus, Figure 5 In the illustrated structure, a first reinforcing plate 32 is provided on the back side of the right guiding plate 31.

[0109] As a further option, for example, the right guiding plate 31 and the right main guiding plate 34 are both provided with flanges 33 on their upper and lower edges as a whole. The flanges 33 can further strengthen the rigidity of the entire right alignment frame 8.

[0110] Regarding the back side, it should be known that the working surface of the guiding plate is its inner plate surface, which is also the surface where the two guiding plates face each other. Then the back side generally refers to the surface opposite to the working surface, which is the surface where the two guiding plates face away from each other.

[0111] In Figure 1 As can be seen from the illustrated structure, the left sealing assembly 7 is installed on the left alignment frame 8, and the right sealing assembly 2 is installed on the right alignment frame 8, which can effectively solve the problem of position interference.

[0112] As mentioned above, for example, in the case of a cotton cloth sleeve bag with film laminating on the bag mouth and bag surface, the bag surface after film laminating also has a certain rigidity. Therefore, when folding the upper bag surface at the bag mouth, for example, the upper sealing plate 51 of the upper sealing assembly 5 does not have to be a completely solid plate, but can be a frame-shaped plate or a U-shaped plate, that is, it has relatively good conditions suitable for installing the first welding device. Specifically, under the pressing of the upper sealing plate 51, for example, the folding overlapping area exposed by the U-shaped plate can be welded by the first welding device.

[0113] Correspondingly, the frame plate can be understood as a rectangular ring plate, and the provided rectangular opening can also be used as the welding channel for the first welding device.

[0114] Correspondingly, the U-shaped opening of the U-shaped plate or the rectangular opening of the rectangular plate can locate the corresponding first welding position of the folding overlapping area after folding the upper bag surface at the bag mouth. Thus, when the first welding device is installed on the upper sealing assembly 5 at the same time, the whole is more compact, and the accuracy of the first welding is easier to achieve.

[0115] Installing the first welding device on the upper sealing assembly 5 can realize the synchronous lifting of the first welding device and the upper sealing assembly 5, the operation is more convenient, and the alignment of the first welding device is accurate and easier to ensure.

[0116] The foregoing also involves the description of the shapes of the bag mouths and the bag surfaces. To improve the quality of sealing, the upper sealing assembly 5 is provided with a bag lifting device, which is used to lift the upper bag surface of the cotton bale wrapper bag mouth before the left sealing assembly 7, the right sealing assembly 2, and the lower sealing assembly 1 are in place, so as to prevent the upper bag surface from collapsing or curling, which may cause it to be folded prematurely and affect the formation of the final folded and overlapping shape.

[0117] Regarding the bag lifting device configured for the sealing assembly 5, it is obvious that the upper bag surface can be released after the other three sealing assemblies are in place. Thus, it can also be seen that the upper bag surface at the bag mouth is the last bag surface to be folded in the preferred embodiment.

[0118] Regarding the bag lifting method of the bag lifting device, for plastic wrapper bags, the method of sucking and lifting upward by a suction cup can be adopted. Thus, it can also be seen that if the suction cup is installed on the upper sealing assembly 5, the upper sealing assembly 5 needs to make two reciprocating motions during one sealing operation, one for the sealing itself and the other for the bag lifting action.

[0119] Regarding the suction cup, such as Figure 9 the top edge suction cup 452 shown in

[0120] here, the "top edge" refers to the part of the upper bag surface near the bag mouth edge at the bag mouth. For cotton wrapper bags, since cotton is breathable, the suction cup cannot be used to pick up. However, as mentioned above, in order to meet the requirement of automatic sealing, such cotton wrapper bags usually form a hot melt film at the bag mouth by methods such as film laminating or dipping in glue, and the suction cup can pick up the hot melt film.

[0121] In some embodiments, an electric gripper can also be used as the bag lifting device.

[0122] Regarding the secondary welding, a secondary welding device independent of the primary welding device is provided, such as Figure 1 and Figure 4 the secondary welding assembly 9 shown in

[0123] Furthermore, the secondary welding device includes: the secondary welding assembly 9; a third driving device for driving the secondary welding component in the secondary welding assembly 9 to run in the front-back direction of the cotton bale; a fourth driving device for driving the conversion of the secondary welding assembly 9 between the third position and the fourth position. When the secondary welding assembly is in the third position, the secondary welding component is aligned with the folded and overlapping area; when the secondary welding assembly is in the fourth position, the secondary welding assembly disengages from the running path of the cotton bale.

[0124] Since the secondary welding method is similar to the primary welding method, it will not be elaborated here.

[0125] Regarding the secondary welding assembly in the secondary welding assembly 9, the welding area of the secondary welding assembly is greater than or equal to the welding area of the primary welding assembly 45, so as to ensure relatively high sealing reliability after secondary welding.

[0126] Since the primary welding has formed a welded body locally, in principle, the secondary welding does not need to repeat the welding of this welded body. Therefore, if the welding area of the secondary welding assembly is equal to the welding area of the primary welding assembly 45, the position of the secondary welding is misaligned with the position of the primary welding, thus forming two welding points, which can basically ensure the reliability of the welded seal.

[0127] If the welding area of the secondary welding is larger than that of the primary welding, the position of the secondary welding can be misaligned with the position of the primary welding, or it can directly cover the position of the primary welding. Both methods can basically ensure the reliability of the welded seal.

[0128] As mentioned above, the primary welding can be like spot welding, so the requirement for the coverage range of the primary welding is not very large. The secondary welding requires meeting the final sealing quality. Therefore, simply speaking of the secondary welding itself, in the preferred embodiment, it should have a relatively large welding area, so that the corresponding bag mouth surfaces of the seal are fully connected.

[0129] Due to the use of hot melt welding, the part of the secondary welding assembly in contact with, for example, the bag mouth surface of the plastic sleeve bag will produce adhesion. In order to avoid the damage to the sealed part caused by this adhesion, a limiting device for pressing the folded bag surface or blocking the folded bag surface when the third driving device retracts is provided on the secondary bracket equipped with the secondary welding device.

[0130] In addition, considering the problem of heat penetration in hot melt, when performing hot melt welding, the secondary welding assembly often needs to reciprocate several times to achieve reliable welding. Under this condition, the device for limiting the folded bag surface is more necessary.

[0131] See the attached Figure 10 to the specification. As can be seen from the figure, the transverse length dimension of the secondary heating welding plate module 99 included in the secondary welding assembly is much larger than that of the primary heating welding plate block 457 equipped for the primary welding. And whether it is the secondary heating welding plate module 99 or the primary heating welding plate block 457, their heating surfaces are in an array structure of block bodies. Under the condition of relatively low energy consumption, a relatively large welding coverage area is still obtained, thus having a better sealing effect.

[0132] Among them, the individual of the secondary heating welding plate module 99 is relatively large. The secondary welding plate of the corresponding secondary welding assembly is divided into multiple pieces, and there are spacing gaps 997 between the multiple pieces.

[0133] Furthermore, the limiting device is a fixed rod arranged on the running path before and after the spacing gap 997, such asFigure 10 The anti-reverse rod 98 shown in the figure, since the anti-reverse rod 98 is statically set relative to the secondary heating welding plate module 99, when the secondary heating welding plate module 99 retracts, the adhered bag surface will touch the anti-reverse rod 98 and be torn off.

[0134] The purpose of several weldings is to ensure heat penetration under the condition that the overall power of the secondary heating welding plate module 99 is relatively large, for example, without causing melting due to local overheating. More precisely, it belongs to softening bonding. The bonding mechanism of, for example, plastic sleeve bags is also common knowledge in this field and will not be elaborated here.

[0135] To avoid interference with each other, as Figure 1 shown, the secondary welding device is located on the front side of the frame 6, while the primary welding device is located on the rear side of the sealing frame. At this time, for adaptation, before secondary welding, the cotton bale needs to be pushed forward a given distance relative to the position of the primary welding.

[0136] In view of the relatively detailed description of each component of the cotton bale sleeve bag sealing and welding device in the illustrative structure of the specification drawings, it will not be elaborated one by one here. It should be noted that the illustrative structure in the specification drawings is for "illustration" and does not cover comprehensively. Combining the content described in this specification, simple substitutions made by those skilled in the art should still fall within the protection scope of the present invention.

[0137] Regarding the welding method using the aforementioned cotton bale sleeve bag sealing and welding device, it has been mentioned above. The following briefly describes the basic steps of the welding method: 1) The cotton bale after bagging is conveyed to the first position of the platform; 2) The left sealing assembly 7 and the right sealing assembly 2 act synchronously to push the left and right bag surfaces of the open bag mouth of the cotton bale sleeve bag towards each other and close them to the rear end face of the cotton bale; 3) The lower sealing assembly 1 pushes the lower bag surface of the cotton bale sleeve bag mouth upwards to the rear end face of the cotton bale; 4) The upper sealing assembly 5 pushes the upper bag surface of the cotton bale sleeve bag mouth downwards to the rear end face of the cotton bale; 5) Perform a primary welding on the exposed part of the folded and overlapping area of each bag surface on the rear end face of the cotton bale relative to each sealing assembly; 6) Each sealing assembly resets.

[0138] During primary welding, multiple contact-type hot melt welding is used, with an interval of 1 - 5 s between adjacent times.

[0139] After each sealing assembly is reset, secondary welding is performed on the folded and overlapped area. If the secondary welding is performed in place, the bale does not need to be moved; while if the position needs to be adjusted to accommodate the position of the secondary welding device, the bale needs to be first sent to the second position for secondary welding. Accordingly, the second position is adapted to the position of the secondary welding device.

[0140] The secondary welding is stagger-welded with the primary welding or the secondary welding covers the primary welding; When the secondary welding covers the primary welding, the area of the secondary welding is 2 to 4 times that of the primary welding.

Claims

1. A cotton bag sealing welding device, characterized in that: include: A sealing frame having a platform for holding the cotton bale after wrapping, the platform having upper and lower channels corresponding to the rear side of the cotton bale currently in place; The left sealing assembly and the right sealing assembly are located on the left and right sides of the platform, so as to push the bag opening from the left and right sides of the bag opening toward each other, so that the left and right bag surfaces at the bag opening are folded onto the rear end surface of the cotton bale; The lower sealing assembly is located below the platform, and the lower sealing component of the lower sealing assembly passes upward from the upper and lower channels to push the lower bag surface at the bag opening upward from the lower side of the bag opening to the rear end surface of the cotton bale; The upper sealing assembly is located above the platform to push the upper bag surface at the bag opening downward from the upper side of the bag opening to the rear end surface of the cotton bale; as well as A primary welding device comprises a primary welding component, a first driving device for driving the primary welding component to move in the front-rear direction of a cotton bale, and a second driving device for driving the primary welding component to switch between a first position and a second position; wherein the first position is a position where the primary welding component is located at the rear side of the rear bag surface of the cotton bale, and the second position is a position that is detached from the travel path of the cotton bale; when the primary welding device is in the first position, the primary welding component is located at the folded and overlapped area remaining after the bag surfaces of each sealing assembly are folded in place.

2. The cotton bag sealing welding device according to claim 1, characterized in that: The sealing components provided by the left sealing assembly and the right sealing assembly are sealing plates, which are symmetrical in structure, and the opposite ends of the two sealing plates are tapered guide parts.

3. The cotton bag sealing welding device according to claim 2, characterized in that: The top end of the conical leading portion is an arc-shaped head.

4. The cotton bag sealing welding device according to claim 1 or 2, characterized in that: The component that pushes the sealing plate to move in the left-right direction is a linear drive mechanism or a linear drive component.

5. The cotton bag sealing welding device according to claim 4, characterized in that: The linear drive mechanism is selected from a synchronous belt mechanism, a transmission chain mechanism, a screw nut mechanism or a rack and pinion mechanism; The linear drive component is selected from a cylinder, a hydraulic cylinder, a linear motor or an electric push rod.

6. The cotton bag sealing welding device according to claim 4, characterized in that: The frame of the linear drive mechanism or the seat of the linear drive component is hinged to the corresponding side of the sealing frame through a rotating shaft perpendicular to the platform; A swing drive device is provided for driving the frame or the seat to swing, so as to swing the corresponding linear drive mechanism or the linear drive component out of the cotton bale pushing path.

7. The cotton bag sealing welding device according to claim 6, characterized in that: The swing driving device is a swing cylinder, a swing motor, a gear rack mechanism or a triangle mechanism.

8. The cotton bag sealing welding device according to claim 1, characterized in that: Straightening racks are provided on both sides of the cotton bale conveying path to guide the pushed cotton bales to the middle of the left and right directions of the platform.

9. The cotton bag sealing welding device according to claim 8, characterized in that: The straightening frame includes an inlet plate at the cotton bale inlet side and a main guide plate connected to the inlet plate; A conical introduction port is defined between the corresponding introduction plates on the left and right sides; The two main conductive plates corresponding to the left and right sides are parallel to each other.

10. The cotton bag sealing welding device according to claim 9, characterized in that: A reinforcing plate is provided on the back side of the introduction plate; The back side is the side opposite to the working surface of the introduction plate.

11. The cotton bag sealing welding device according to claim 10, characterized in that: The upper and lower plate edges of the introduction plate have flanges turned up toward the back side.

12. The cotton bag sealing welding device according to any one of claims 8 to 11, characterized in that: The left sealing assembly and the right sealing assembly are installed on the straightening frame.

13. The cotton bag sealing welding device according to claim 1, characterized in that: The primary welding device is installed on the upper sealing assembly.

14. The cotton bag sealing welding device according to claim 1 or 13, characterized in that: The upper sealing assembly is provided with a bag lifting device, which is used to lift the upper bag surface of the bag opening of the cotton bale before the left and right sealing assemblies and the lower sealing assembly are in place.

15. The cotton bag sealing welding device according to claim 13, characterized in that: The lower part of the sealing plate equipped with the upper sealing assembly is a U-shaped plate body or a sealing plate body with a rectangular opening; Correspondingly, the primary welding assembly is located at the U-shaped opening or the rectangular opening to weld the folded overlap area at a position determined by the U-shaped opening or the rectangular opening.

16. The cotton bag sealing welding device according to claim 1, characterized in that: It also includes a secondary welding device located on the sealing frame to perform secondary welding on the folded overlapping area after the corresponding sealing assembly is reset; the secondary welding device includes: Secondary welding assembly; A third driving device is used to drive the secondary welding components in the secondary welding assembly to move in the front-rear direction of the cotton bale; The fourth driving device is used to drive the secondary welding assembly to switch between the third position and the fourth position, wherein when the secondary welding assembly is in the third position, the secondary welding component is aligned with the folded overlapping area; when the secondary welding assembly is in the fourth position, the secondary welding assembly is disengaged from the cotton bale running path.

17. The cotton bag sealing welding device according to claim 16, characterized in that: The welding area of ​​the secondary welded assembly is greater than or equal to the welding area of ​​the primary welded assembly; If they are equal, the position of the secondary welding is misaligned with the position of the primary welding; If it is greater, the position of the secondary welding is misaligned with the position of the primary welding or covers the position of the primary welding.

18. The cotton bag sealing welding device according to claim 16 or 17, characterized in that: The secondary bracket of the secondary welding device is provided with a limiting device for pressing the folded bag surface or blocking the folded bag surface when the third driving device retreats.

19. The cotton bag sealing welding device according to claim 18, characterized in that: The secondary welding assembly has a plurality of secondary welding plates, with interval seams between the plates; The limiting device is a fixed rod arranged in the running path before and after the spacing gap.

20. The cotton bag sealing welding device according to claim 16, characterized in that: The secondary welding device is located at the front side of the sealing machine frame, and the primary welding device is located at the rear side of the sealing machine frame.

21. A welding method using the cotton bag sealing welding device according to any one of claims 1 to 20, characterized in that: The welding method comprises the following steps: 1) The wrapped cotton bales are transported to the first position of the platform; 2) The left sealing assembly and the right sealing assembly act synchronously to push the left and right bag surfaces of the opened cotton bale bagging opening toward each other and close them to the rear end surface of the cotton bale; 3) The lower sealing assembly pushes the lower bag surface of the cotton bag cover upward to the rear end surface of the cotton bale; 4) The upper sealing assembly pushes the upper bag surface of the cotton bale bag opening downward to the rear end surface of the cotton bale; 5) Weld the exposed parts of each sealing assembly at the folded and overlapped areas of each bag surface on the rear side end surface of the cotton bale; 6) Reset each sealing assembly.

22. The welding method according to claim 21, characterized in that During one welding, multiple contact hot melt welding is adopted, and a 1~5s interval is left between adjacent times.

23. The welding method according to claim 22, characterized in that: After each sealing assembly is reset, the folded overlapping area is welded for a second time; The secondary welding is staggered with the primary welding or the secondary welding covers the primary welding; When the secondary welding covers the primary welding, the area of ​​the secondary welding is 2 to 4 times the area of ​​the primary welding.

24. A packaging system, characterized in that: Equipped with a cotton bale bag sealing welding device as described in any one of claims 1 to 20.

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