Hot melting welding unit and filter bag center line hot melting welding tool

Abstract

The utility model relates to a hot melt welding unit and filter bag center line hot melt welding frock, the hot melt welding unit comprises a work table, the work table is provided with a hot melt welding mechanism and a limit shaping mechanism, the limit shaping mechanism comprises inner plates on two sides, the end face of each inner plate is U-shaped, and the U-shaped openings of the two inner plates are opposite and are horizontally placed; the upper plate surface of the inner plate is folded to form a horizontal pressing plate; a gap is formed between the pressing plate and the upper surface of the inner plate, and a pressing groove is formed; the upper plate face of the inner plate on one side is higher than the upper surface of the pressing plate on the other side, and the pressing grooves in the two sides are provided with overlapped parts in the vertical direction. And gaps are formed between the lower plate surfaces of the two inner plates and the upper surface of the workbench. According to the utility model, after the originally tiled PP felt cloth passes through the limiting and shaping mechanism along the conveying direction, the PP felt cloth can be welded in a form that two sides are to be laminated and welded, and the laminating width does not need manual assistance, so that the working efficiency of the whole operation process is greatly improved, and the product quality can be effectively ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of filter bags, and in particular relates to a hot-melt welding unit and a centerline hot-melt welding tool for a filter bag. Background Art

[0002] A bag filter is a filter used for filtering smaller particles in an air filtration system, pre-filtering or large-scale painting line air filtration, including an inner and outer frame made of metal material, multiple filter bags and fasteners.

[0003] The raw material of the filter bag is usually PP felt cloth (polypropylene), which is in roll form. When preparing a single filter bag, the cylindrical PP felt cloth must be cut into the required length, and then the two sides in the width direction must be fitted together at a certain width and sewn to form the center line of the filter bag body, and then the subsequent process flow can be carried out.

[0004] In this way, firstly, it is necessary to pre-cut into the required length, and secondly, the two sides of the flat PP felt cloth are rolled inward and then the two sides to be bonded are bonded, and then sewn; the whole process requires a lot of manual assistance and cooperation, and the work efficiency is relatively low; and the sewing method will have gaps, which will affect the filtering effect of the filter bag.

[0005] In the prior art, hot melt welding or ultrasonic welding has been used to perform the fitting connection of the center line of the filter bag, which solves the problem of gaps in manual sewing; however, manual assistance is still required to pre-roll the flat PP felt cloth into a shape to be fitted and welded. It is difficult to manually ensure that the width of the two sides is always consistent, which affects the product quality. The processing efficiency still needs to be further improved. Utility Model Content

[0006] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a hot melt welding unit and a hot melt welding tool for the center line of the filter bag, so as to avoid the problem that manual assistance affects product quality and processing efficiency cannot be effectively improved when welding the center line of the filter bag.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A hot-melt welding unit comprises a workbench, on which a hot-melt welding mechanism is arranged, and the hot-melt welding mechanism is used to hot-melt weld two sides of a PP felt cloth to be bonded together; the workbench is also provided with a position limiting and shaping mechanism, and the position limiting and shaping mechanism comprises inner plates respectively arranged on both sides of the conveying direction of the PP felt cloth, the end faces of the inner plates are U-shaped, and the U-shaped openings of the two inner plates are opposite and horizontally placed;

[0009] The upper plate surface of the inner plate is folded in a direction away from the U-shaped opening to form a horizontal pressing plate, and the length direction of the pressing plate is perpendicular to the conveying direction of the PP felt cloth; a gap is provided between the pressing plate and the upper surface of the inner plate to form a pressing groove, and the length direction of the pressing groove is consistent with the conveying direction of the PP felt cloth, and the width of the pressing groove is adapted to the thickness of the PP felt cloth;

[0010] The upper plate surface of one inner plate is higher than the upper surface of the other pressing plate, so that the pressing grooves on both sides have overlapping parts in the vertical direction. The width of the overlapping part is the fitting width of the two sides of the PP felt cloth; there is a gap between the lower plate surfaces of the two inner plates and the upper surface of the workbench;

[0011] The end of the pressing groove where the PP felt cloth passes through is opposite to the hot-melt welding mechanism.

[0012] To further improve the above technical solution, the limiting and shaping mechanism also includes outer plates respectively located on the outside of the two inner plates, and a spacing is provided between the outer plates and the adjacent inner plates. The outer plates can move away from or approach the adjacent inner plates along the length direction of the pressure plate so that the spacing between the outer plates and the inner plates is adjustable.

[0013] Further, the end surface of the outer plate is arc-shaped, and the inner concave surface of the arc is opposite to the outer surface of the adjacent inner plate;

[0014] The pressure plate is provided with a slide groove vertically along its length direction, and a connecting column is slidably connected in the slide groove. The lower end of the connecting column passes through the slide groove and is connected to the outer surface of the outer plate so that the connecting column drives the outer plate to move along the slide groove. The upper end of the connecting column is connected to a driving component, and the driving component is used to drive the connecting columns on both sides to move toward or away from each other.

[0015] Furthermore, the driving assembly includes a connecting plate located above the slide slot and correspondingly connected to the connecting column, the connecting plate is L-shaped, a connecting hole is vertically penetrated through the horizontal section of the connecting plate, and the upper end of the connecting column passes upward through the connecting hole and is fixedly connected to the horizontal section;

[0016] A device block is provided between the two connecting plates, and the device block is fixedly connected to the upper surface of the pressure plate; two parallel racks are movably connected on the device block along the length direction of the pressure plate; one end of the rack is fixedly connected to the vertical section of the adjacent connecting plate, and the other end of the rack moves through the device block and the opposite connecting plate in turn; a horizontal driving gear is provided between the two racks in the device block, and the driving gear is meshed with the two racks at the same time so that the spacing between the outer plate and the inner plate can be adjusted by rotating the driving gear, and the driving gear is synchronously rotatably connected with its rotating shaft, and the rotating shaft extends upward from the device block and is fixedly connected to a handle.

[0017] Furthermore, the hot melt welding mechanism comprises a frame arranged on a workbench, and two horizontal U-shaped ironing plates are arranged on the frame at intervals along the vertical direction, and the two U-shaped ironing plates have overlapping parts in the vertical direction, and the width of the overlapping parts is the fitting width of the two sides of the PP felt cloth; a spacing for placing a welding head is provided between the two U-shaped ironing plates so that the welding head can heat the two U-shaped ironing plates at the same time;

[0018] The two U-shaped ironing plates correspond to the two pressing grooves one by one so that the side edges of the PP felt cloth are positioned in the U-shaped ironing plates for heating after being limited and shaped in the pressing grooves. The spacing between the upper and lower side plates of a single U-shaped ironing plate is adapted to the thickness of the PP felt cloth.

[0019] Two clamping wheels are vertically spaced apart on the frame, and the two clamping wheels are arranged on the side of the U-shaped ironing plate away from the limiting and forming mechanism; the axial direction of the two clamping wheels is perpendicular to the conveying direction of the PP felt cloth; the gap between the two clamping wheels is for the PP felt cloth to pass through so that the two side edges of the PP felt cloth are welded together to form the center line of the filter bag, and the two clamping wheels rotate in opposite directions and move the PP felt cloth that has been hot-melt welded in a direction away from the limiting and forming mechanism for unloading.

[0020] The utility model also relates to a centerline hot-melt welding tool for a filter bag, comprising a hot-melt welding unit as described above, and also comprising a raw material loading unit; the raw material loading unit comprises a vertical mounting frame, to which a horizontal reel is connected, and the reel is used to place a roll-shaped PP felt cloth raw material, and the axial direction of the reel is perpendicular to the conveying direction of the PP felt cloth.

[0021] Furthermore, a guide unit is provided between the raw material loading unit and the hot-melt welding unit, and the guide unit is used to pre-roll the flat PP felt cloth before it enters the limiting and shaping mechanism;

[0022] The guide unit comprises a U-shaped placement rack and a pre-roll placement rack which are arranged at intervals along the conveying direction of the PP felt cloth;

[0023] The U-shaped opening of the U-shaped placement rack is vertically facing upwards;

[0024] The pre-rolling placement rack comprises a horizontal placement plate, and arc-shaped end plates with inner concave surfaces opposite to each other are connected to the two sides of the placement plate to pre-roll the PP felt cloth before it enters the limiting and shaping mechanism.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] 1. A hot-melt welding unit of the utility model is provided with a limiting and shaping mechanism before the PP felt cloth to be bonded enters the hot-melt welding mechanism for welding. The upper plate of the inner plate is folded and horizontally extended to form a pressing plate. The gap between the inner plate and the pressing plate is formed into a pressing groove for the side edge of the PP felt cloth to pass through. A gap is left between the lower plate of the inner plate and the upper surface of the workbench for part of the two side edges of the PP felt cloth to pass through. In this way, the originally flat PP felt cloth can be welded in the form of the two side edges to be bonded and welded after passing through the limiting and shaping mechanism along its conveying direction, and the bonding width does not require manual assistance, the work efficiency of the entire operation process is greatly improved, and the product quality can be effectively guaranteed.

[0027] 2. A hot-melt welding unit of the utility model is further provided with an outer plate because the hardness of the PP felt cloth itself is relatively soft, and the free end of the side is abutted against the bottom wall of the pressing groove through the outer plate to ensure the welding quality; at the same time, the distance between the outer plate and the inner plate is set to be adjustable to adapt to the centerline hot-melt welding of filter bags of different sizes.

[0028] 3. The centerline hot-melt welding tooling of the filter bag of the utility model only requires the worker to put the raw material on the reel at the beginning, and then insert the side of the PP felt cloth between the inner plate and the outer plate, and continue to pull the PP felt cloth forward so that the two side edges to be welded are located correspondingly in the U-shaped ironing plate, and then pass through the gap between the two clamping wheels. Subsequently, it is only necessary to turn on the heating switch of the welding head to preheat the welding head and control the rotation of the clamping wheel. Subsequently, there is no need for manual assistance to maintain the shape of the PP felt cloth raw material to be welded. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a hot melt welding unit in an embodiment;

[0030] Figure 2 Schematic diagram of the structure of the position limiting and shaping mechanism in the embodiment (front view);

[0031] Figure 3 for Figure 1 A top view of

[0032] Figure 4 It is a schematic diagram of the partial structure of the hot melt welding mechanism in the embodiment;

[0033] Figure 5 It is a structural schematic diagram of the centerline hot-melt welding tooling of the filter bag of the embodiment;

[0034] Figure 6 This is a front view of a U-shaped rack in the embodiment;

[0035] Figure 7 It is a front view of the pre-roll stand in the embodiment;

[0036] Among them, there are a workbench 1, a limiting and forming mechanism 2, an inner plate 21, a pressure plate 22, a slide groove 221, a pressing groove 23, an outer plate 24, a connecting column 25, a connecting plate 26, a device block 27, a rack 28, a handle 29, a hot melt welding mechanism 3, a frame 31, a U-shaped ironing plate 32, a clamping wheel 33, a welding head 34, a mounting frame 41, a reel 42, a U-shaped placement frame 51, a placement plate 52, an arc-shaped end plate 53, and a placement frame 54. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0038] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when used, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0040] See also Figure 1-Figure 3 A hot melt welding unit of a specific embodiment includes a workbench 1, on which a hot melt welding mechanism 3 is provided, and the hot melt welding mechanism 3 is used to hot melt weld the two sides of the PP felt cloth to be bonded into one; the workbench 1 is also provided with a limiting shaping mechanism 2, and the limiting shaping mechanism 2 includes inner plates 21 respectively arranged on both sides of the conveying direction of the PP felt cloth, and the end faces of the inner plates 21 are U-shaped, and the U-shaped openings of the two inner plates 21 are opposite and horizontally placed;

[0041] The upper plate surface of the inner plate 21 is folded in a direction away from the U-shaped opening to form a horizontal pressing plate 22, and the length direction of the pressing plate 22 is perpendicular to the conveying direction of the PP felt cloth; a gap is provided between the pressing plate 22 and the upper surface of the inner plate 21 to form a pressing groove 23, and the length direction of the pressing groove 23 is consistent with the conveying direction of the PP felt cloth, and the width of the pressing groove 23 is adapted to the thickness of the PP felt cloth;

[0042] The upper surface of the inner plate 21 on one side is higher than the upper surface of the pressure plate 22 on the other side, so that the pressing grooves 23 on both sides have overlapping parts in the vertical direction, and the width of the overlapping part is the fitting width of the two sides of the PP felt cloth; a gap is provided between the lower surface of the two inner plates 21 and the upper surface of the workbench 1;

[0043] The end of the pressing groove 23 through which the PP felt cloth passes is opposite to the hot-melt welding mechanism 3 .

[0044] A hot melt welding unit of the embodiment is provided with a limiting and forming mechanism 2 before the PP felt cloth to be bonded enters the hot melt welding mechanism 3 for welding. The upper plate of the inner plate 21 is folded and horizontally extended to form a pressing plate 22. The gap between the inner plate 21 and the pressing plate 22 is formed into a pressing groove 23 for the side edge of the PP felt cloth to pass through. A gap is left between the lower plate of the inner plate 21 and the upper surface of the workbench 1 for part of the two side edges of the PP felt cloth to pass through. In this way, after the originally flat PP felt cloth passes through the limiting and forming mechanism 2 along its conveying direction, it can be welded in the form of the two side edges to be bonded and welded, and the bonding width does not require manual assistance, the work efficiency of the entire operation process is greatly improved, and the product quality can be effectively guaranteed.

[0045] See also Figure 2 The limiting and shaping mechanism 2 further includes outer plates 24 respectively located on the outside of the two inner plates 21, and a spacing is provided between the outer plates 24 and the adjacent inner plates 21. The outer plates 24 can be moved away from or close to the adjacent inner plates 21 along the length direction of the pressure plate 22 so that the spacing between the outer plates 24 and the inner plates 21 is adjustable.

[0046] In this way, since the hardness of the PP felt cloth itself is relatively soft, an outer plate 24 is further provided, through which the free end of the side is abutted against the bottom wall of the pressing groove 23 to ensure the welding quality; at the same time, the distance between the outer plate 24 and the inner plate 21 is set to be adjustable to adapt to the centerline hot melt welding of filter bags of different sizes.

[0047] During implementation, the end surface of the outer plate 24 is arc-shaped, and the inner concave surface of the arc is opposite to the outer surface of the adjacent inner plate 21;

[0048] The pressure plate 22 is provided with a slide groove 221 vertically along its length direction, and a connecting column 25 is slidably connected in the slide groove 221. The lower end of the connecting column 25 passes through the slide groove 221 and is connected to the outer surface of the outer plate 24 so that the connecting column 25 drives the outer plate 24 to move along the slide groove 221. The upper end of the connecting column 25 is connected to a driving component, and the driving component is used to drive the connecting columns 25 on both sides to move toward or away from each other.

[0049] During implementation, the lower end of the connecting column 25 is welded to the outer surface of the outer plate 24 .

[0050] See also Figure 2 and Figure 3 , wherein the driving assembly includes a connecting plate 26 located above the slide slot 221 and correspondingly connected to the connecting column 25, the connecting plate 26 is L-shaped, and a connecting hole is vertically penetrated through the horizontal section of the connecting plate 26, and the upper end of the connecting column 25 passes through the connecting hole upward and is fixedly connected to the horizontal section;

[0051] A device block 27 is provided between the two connecting plates 26, and the device block 27 is fixedly connected to the upper surface of the pressing plate 22; two parallel racks 28 are movably passed through the device block 27 along the length direction of the pressing plate 22; one end of the rack 28 is fixedly connected to the vertical section of the adjacent connecting plate 26, and the other end of the rack 28 is movably passed through the device block 27 and the opposite connecting plate 26 in turn; a horizontal driving gear (not shown in the figure) is provided between the two racks 28 in the device block 27, and the driving gear is meshed with the two racks 28 at the same time so that the outer plates 24 on both sides can move toward or away from each other by rotating the driving gear, and the driving gear is synchronously rotatably connected with its rotating shaft (not shown in the figure), and the rotating shaft extends upward from the device block 27 and is fixedly connected to a handle 29.

[0052] In this way, rotating the handle 29 can drive the driving gear to rotate, further drive the two racks 28 to achieve axial movement with the same lead and opposite directions, and can also drive the connecting columns 25 on both sides to achieve movement toward or away from each other, and finally achieve adjustable spacing between the outer plate 24 and the inner plate 21; in specific implementation, the main body shape of the rack 28 is a round rod, and the through holes on the vertical section of the connecting plate 26 and the holes on the device block 27 are all round holes, which are convenient for processing. Only teeth need to be processed on the opposite surfaces of the two racks 28 on the rack 28. The non-fixed end of the rack 28 movably passes through the connecting plate 26 on the opposite side, so that the movement of the rack 28 itself along its axial direction is more stable; such as Figure 3 As shown, there are two corresponding sliding grooves 221 and connecting pillars 25 on each pressing plate 22, so as to make the movement of the connecting pillars 25 driven by the gear rack mechanism more stable.

[0053] See also Figure 1 and Figure 4 The hot-melt welding mechanism 3 comprises a frame 31 arranged on the workbench 1, and two horizontal U-shaped ironing plates 32 are arranged on the frame 31 at intervals along the vertical direction. The two U-shaped ironing plates 32 have overlapping parts in the vertical direction, and the width of the overlapping parts is the fitting width of the two sides of the PP felt cloth; a spacing for placing a welding head 34 is provided between the two U-shaped ironing plates 32 so that the welding head 34 can heat the two U-shaped ironing plates 32 at the same time;

[0054] The two U-shaped ironing plates 32 correspond to the two pressing grooves 23 one by one so that the side edge of the PP felt cloth is positioned in the U-shaped ironing plate 32 for heating after being limited and shaped by the pressing groove 23. The spacing between the upper and lower side plates of a single U-shaped ironing plate 32 is adapted to the thickness of the PP felt cloth.

[0055] Two clamping wheels 33 are also vertically spaced apart on the frame 31, and the two clamping wheels 33 are arranged on the side of the U-shaped ironing plate 32 away from the limiting and molding mechanism 2; the axial direction of the two clamping wheels 33 is perpendicular to the conveying direction of the PP felt cloth; the gap between the two clamping wheels 33 is for the PP felt cloth to pass through so that the two side edges of the PP felt cloth are welded together to form the center line of the filter bag, and the two clamping wheels 33 rotate in opposite directions and move the PP felt cloth that has been hot-melt welded in a direction away from the limiting and molding mechanism 2 for unloading.

[0056] In this way, the pressing groove 23 located at the top corresponds to the U-shaped ironing plate 32 located at the top, and the pressing groove 23 located at the bottom corresponds to the U-shaped ironing plate 32 located at the bottom. The welding head 34 does not directly contact the PP felt cloth. The welding head 34 heats the two U-shaped ironing plates 32, and the U-shaped ironing plates 32 heat the side edges of the PP felt cloth. Then, two pressing wheels 33 are used to press and fit the two side edges of the PP felt cloth to be bonded. After bonding, the center line of the filter bag body is formed.

[0057] A hot-melt welding unit of the present embodiment does not need to cut the length of the PP felt cloth in advance, and can directly perform hot-melt welding and then cut it after cutting.

[0058] See also Figure 5 The present embodiment also provides a centerline hot melt welding tool for the filter bag, including a hot melt welding unit as described above, and also includes a raw material loading unit; the raw material loading unit includes a vertical mounting frame 41, and a horizontal reel 42 is connected to the mounting frame 41, and the reel 42 is used to place the roll-shaped PP felt cloth raw material, and the axial direction of the reel 42 is perpendicular to the conveying direction of the PP felt cloth.

[0059] In this way, the worker only needs to put the raw material on the reel 42, then insert the side edge of the PP felt cloth between the inner plate 21 and the outer plate 24, and continue to pull the PP felt cloth forward so that the two side edges to be welded are located correspondingly in the U-shaped ironing plate 32, and then pass through the gap between the two clamping wheels 33. Subsequently, it is only necessary to turn on the heating switch of the welding head 34 to heat the welding head 34 and control the rotation of the clamping wheel 33. There is no need to manually assist the PP felt cloth raw material to maintain the shape to be welded.

[0060] See also Figure 5-Figure 7 , wherein a guide unit is further provided between the raw material loading unit and the hot-melt welding unit, and the guide unit is used to pre-roll the flat PP felt cloth before it enters the limiting shaping mechanism 2;

[0061] The guide unit includes a U-shaped placement rack 51 and a pre-roll placement rack arranged at intervals along the conveying direction of the PP felt cloth;

[0062] The U-shaped opening of the U-shaped placement rack 51 is vertically facing upward;

[0063] The pre-rolling rack comprises a horizontal placing plate 52 , and arc-shaped end plates 53 with oppositely arranged inner concave surfaces are connected to the two sides of the placing plate 52 to pre-roll the PP felt cloth before it enters the limiting and shaping mechanism 2 .

[0064] In this way, the originally flat PP felt cloth is pre-rolled step by step through the devices of the guide unit, so that it enters the limiting shaping mechanism 2 more smoothly, and the movement of the PP felt cloth along its conveying direction in the entire tooling is more stable and reliable.

[0065] During implementation, the height of the placement plate 52 on the pre-roll placement rack should be matched with the height of the position limiting and shaping mechanism 2 as much as possible.

[0066] See also Figure 5 and Figure 1 , the use process of the centerline hot-melt welding tooling of the filter bag is explained in detail. The rolled PP felt cloth is placed on the reel 42. At the beginning, the worker needs to pull the free end of the PP felt cloth and pass it through the U-shaped placement rack 51 and the pre-roll placement rack in turn, so that the two side edges of the flat PP felt cloth are pre-rolled inward into a semicircle, and then the PP felt cloth is pulled through the limiting shaping mechanism 2, and the two side edges to be bonded are passed through the U-shaped ironing plate 32 one by one, and finally passed through the gap between the two clamping wheels 33. In this way, there is no need for manual assistance to start the power supply of the hot-melt welding unit subsequently. Under the drive of the clamping wheel 33, the PP felt cloth will automatically move forward along the conveying direction in the form to be bonded and welded for hot-melt welding.

[0067] exist Figure 5 In the figure, the guide unit also includes a placement rack 54 arranged between the U-shaped placement rack 51 and the raw material loading unit. The main body of the placement rack 54 is two horizontal limit rods. This arrangement takes into account that the distance between the raw material loading unit and the U-shaped placement rack 51 cannot be too close, because a certain buffer distance is required to roll the flat PP felt cloth into a U shape, but the PP felt cloth located between the raw material loading unit and the U-shaped placement rack 51 will fall downward under the action of its own gravity, and it is also inconvenient to transport the PP felt cloth forward. Therefore, a placement rack 54 is set, and the free end of the PP felt cloth passes through between the two limit rods and then through the U-shaped placement rack 51, which can provide support for this part of the PP felt cloth to make the forward transportation smoother.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A hot melt welding unit, comprising a workbench, on which a hot melt welding mechanism is provided, the hot melt welding mechanism being used to hot melt weld two sides of the PP felt cloth to be bonded together; characterized in that: The workbench is also provided with a position limiting and shaping mechanism, which includes inner plates respectively arranged on both sides of the conveying direction of the PP felt cloth, the end faces of the inner plates are U-shaped, and the U-shaped openings of the two inner plates are opposite and horizontally placed; The upper plate surface of the inner plate is folded in a direction away from the U-shaped opening to form a horizontal pressing plate, and the length direction of the pressing plate is perpendicular to the conveying direction of the PP felt cloth; a gap is provided between the pressing plate and the upper surface of the inner plate to form a pressing groove, and the length direction of the pressing groove is consistent with the conveying direction of the PP felt cloth, and the width of the pressing groove is adapted to the thickness of the PP felt cloth; The upper plate surface of one inner plate is higher than the upper surface of the other pressing plate, so that the pressing grooves on both sides have overlapping parts in the vertical direction. The width of the overlapping part is the fitting width of the two sides of the PP felt cloth; there is a gap between the lower plate surfaces of the two inner plates and the upper surface of the workbench; The end of the pressing groove where the PP felt cloth passes through is opposite to the hot-melt welding mechanism.

2. A hot melt welding unit according to claim 1, characterized in that: The limiting shaping mechanism also includes outer plates respectively located outside the two inner plates, with a spacing between the outer plates and the adjacent inner plates. The outer plates can move away from or close to the adjacent inner plates along the length direction of the pressure plate so that the spacing between the outer plates and the inner plates is adjustable.

3. A hot melt welding unit according to claim 2, characterized in that: The end surface of the outer plate is arc-shaped, and the inner concave surface of the arc is opposite to the outer surface of the adjacent inner plate; The pressure plate is provided with a slide groove vertically along its length direction, and a connecting column is slidably connected in the slide groove. The lower end of the connecting column passes through the slide groove and is connected to the outer surface of the outer plate so that the connecting column drives the outer plate to move along the slide groove. The upper end of the connecting column is connected to a driving component, and the driving component is used to drive the connecting columns on both sides to move toward or away from each other.

4. A hot melt welding unit according to claim 3, characterized in that: The driving assembly includes a connecting plate located above the slide slot and correspondingly connected to the connecting column, the connecting plate is L-shaped, a connecting hole is vertically penetrated through the horizontal section of the connecting plate, and the upper end of the connecting column passes upward through the connecting hole and is fixedly connected to the horizontal section; A device block is provided between the two connecting plates, and the device block is fixedly connected to the upper surface of the pressure plate; two parallel racks are movably connected on the device block along the length direction of the pressure plate; one end of the rack is fixedly connected to the vertical section of the adjacent connecting plate, and the other end of the rack moves through the device block and the opposite connecting plate in turn; a horizontal driving gear is provided between the two racks in the device block, and the driving gear is meshed with the two racks at the same time so that the spacing between the outer plate and the inner plate can be adjusted by rotating the driving gear, and the driving gear is synchronously rotatably connected with its rotating shaft, and the rotating shaft extends upward from the device block and is fixedly connected to a handle.

5. A hot melt welding unit according to any one of claims 1 to 4, characterized in that: The hot melt welding mechanism comprises a frame arranged on a workbench, on which two horizontal U-shaped ironing plates are arranged at intervals along the vertical direction, and the two U-shaped ironing plates have overlapping parts in the vertical direction, and the width of the overlapping parts is the fitting width of the two sides of the PP felt cloth; a spacing for placing a welding head is provided between the two U-shaped ironing plates so that the welding head can heat the two U-shaped ironing plates at the same time; The two U-shaped ironing plates correspond to the two pressing grooves one by one so that the side edges of the PP felt cloth are positioned in the U-shaped ironing plates for heating after being limited and shaped in the pressing grooves. The spacing between the upper and lower side plates of a single U-shaped ironing plate is adapted to the thickness of the PP felt cloth. Two clamping wheels are vertically spaced apart on the frame, and the two clamping wheels are arranged on the side of the U-shaped ironing plate away from the limiting and forming mechanism; the axial direction of the two clamping wheels is perpendicular to the conveying direction of the PP felt cloth; the gap between the two clamping wheels is for the PP felt cloth to pass through so that the two side edges of the PP felt cloth are welded together to form the center line of the filter bag, and the two clamping wheels rotate in opposite directions and move the PP felt cloth that has been hot-melt welded in a direction away from the limiting and forming mechanism for unloading.

6. Filter bag centerline hot melt welding tooling, characterized by: It includes a hot melt welding unit as described in claim 5, and also includes a raw material loading unit; the raw material loading unit includes a vertical mounting frame, the mounting frame is connected to a horizontal reel, the reel is used to place a roll-shaped PP felt cloth raw material, and the axial direction of the reel is perpendicular to the conveying direction of the PP felt cloth.

7. The filter bag centerline hot-melt welding tool according to claim 6, characterized in that: A guide unit is also provided between the raw material loading unit and the hot-melt welding unit, and the guide unit is used to pre-roll the flat PP felt cloth before it enters the limiting shaping mechanism; The guide unit comprises a U-shaped placement rack and a pre-roll placement rack which are arranged at intervals along the conveying direction of the PP felt cloth; The U-shaped opening of the U-shaped placement rack is vertically facing upward; The pre-rolling placement rack comprises a horizontal placement plate, and arc-shaped end plates with inner concave surfaces opposite to each other are connected to the two sides of the placement plate to pre-roll the PP felt cloth before it enters the limiting and shaping mechanism.

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