Glue spraying device for center joint of paper tube

Abstract

The utility model discloses a paper tube center joint glue spraying device which comprises a glue spraying mechanism and a deviation rectifying mechanism, the glue spraying mechanism comprises a glue spraying head and a glue supply assembly, and the glue spraying head is used for spraying glue to the outer surface of an inner paper-plastic composite material at the center joint of a paper tube; the deviation rectifying mechanism comprises a deviation rectifying driving assembly and a deviation rectifying detection assembly, the deviation rectifying detection assembly is used for detecting the position of the edge of the outer paper-plastic composite material at the center seam of the paper tube in the width direction of the paper tube, and the deviation rectifying driving assembly is in signal connection with the deviation rectifying detection assembly; the deviation rectifying driving assembly is used for receiving position signals of the edge of the center joint of the paper tube in the width direction of the paper tube so as to control the glue spraying head and the deviation rectifying detection assembly to synchronously move in the width direction of the paper tube, and the width direction of the paper tube is perpendicular to the conveying direction of the paper tube. According to the glue spraying device, it can be ensured that the distance between the glue spraying position in the width direction of the paper tube and the edge of the outer paper-plastic composite material at the center joint of the paper tube is set, so that the fitting precision of the center joint of the paper tube is ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of paper bag production equipment, and in particular to a paper tube seam spraying device. Background Technology

[0002] Currently, paper bags are widely used in industrial packaging for products such as powders and granules. To increase paper bag production capacity, manufacturers generally use automated paper bag production equipment, mainly consisting of a tube-making machine and a bottom-gluing machine working together to automate the paper bag processing. The tube-making machine is used to make strips of paper into paper tubes that are open at both ends. During the paper tube forming process, the center seam of the paper tube needs to be glued. Currently, the existing method for gluing the center seam is to use a hot melt glue extruder, which results in a certain delay in gluing. Furthermore, during the paper tube conveying process, the edge of the outer paper-plastic composite material at the center seam is prone to deviate, leading to inaccurate glue application and affecting the precision of the center seam bonding. Utility Model Content

[0003] The purpose of this utility model is to provide a paper tube seam spraying device to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0005] This utility model provides a paper tube seam glue spraying device, including:

[0006] The glue spraying mechanism includes a glue spraying head and a glue supply assembly connected to the glue spraying head. The glue supply assembly is used to supply hot melt glue to the glue spraying head, and the glue spraying head is used to spray glue onto the outer surface of the paper-plastic composite material inside the seam of the paper tube.

[0007] The correction mechanism includes a correction drive component and a correction detection component. The correction detection component and the glue spray head are arranged sequentially along the paper tube conveying direction. The correction detection component is used to detect the position of the edge of the outer paper-plastic composite material at the center seam of the paper tube in the width direction of the paper tube. The correction drive component is signal-connected to the correction detection component. The correction drive component is used to receive the position signal of the edge of the center seam of the paper tube in the width direction of the paper tube, so as to control the glue spray head and the correction detection component to move synchronously along the width direction of the paper tube. The width direction of the paper tube is perpendicular to the paper tube conveying direction.

[0008] The beneficial effects of this paper tube seam glue spraying device are:

[0009] During use, the semi-finished paper tube is conveyed along the paper tube conveying direction. When it passes the correction detection component, the correction detection component detects the position of the edge of the outer paper-plastic composite material at the center seam of the paper tube in the width direction of the paper tube and transmits the position signal to the correction drive component. After receiving the position signal, the correction drive component controls the glue spraying head and the correction detection component to move synchronously along the width direction of the paper tube, so that the glue spraying head sprays glue at the corresponding position on the outer surface of the inner paper-plastic composite material at the center seam of the paper tube. This ensures that the glue spraying position in the width direction of the paper tube is at a set distance from the edge of the outer paper-plastic composite material at the center seam of the paper tube. At the same time, the glue supply component supplies hot melt glue to the glue spraying head, and the glue is applied by hot melt glue spraying to ensure the accuracy of the paper tube center seam bonding.

[0010] As a further improvement to the above technical solution, the relative position between the glue spraying head and the correction detection component in the width direction of the paper tube can be adjusted.

[0011] As a further improvement to the above technical solution, the correction mechanism includes a correction sliding frame, and the correction driving component is used to drive the correction sliding frame to reciprocate along the width direction of the paper tube. The correction sliding frame is provided with an extension seat extending along the width direction of the paper tube. The glue spray head is fixedly installed on the extension seat. The extension seat is provided with a sliding seat that is slidably adjustable along the width direction of the paper tube. The correction detection component is installed on the sliding seat.

[0012] As a further improvement to the above technical solution, the correction mechanism includes a paper-lifting component, which is located upstream of the correction detection component in the paper tube conveying direction. The paper-lifting component is used to slide against the inner surface of the outer paper-plastic composite material at the paper tube seam, so as to separate the outer paper-plastic composite material and the inner paper-plastic composite material at the paper tube seam along a first direction, which is perpendicular to the paper tube width direction and the paper tube conveying direction, respectively.

[0013] As a further improvement to the above technical solution, the paper warping component is a guide rod extending along the width direction of the paper tube, and the guide rod is movably and adjustablely mounted on the sliding seat relative to the correction detection component.

[0014] As a further improvement to the above technical solution, the correction detection component includes a position signal radiator and a position signal receiver arranged at intervals and opposite to each other. The position signal radiator and the position signal receiver are respectively located on the inner and outer sides of the outer paper-plastic composite material at the seam of the paper tube.

[0015] As a further improvement to the above technical solution, the correction detection component includes a U-shaped frame, the position signal radiator and the position signal receiver are respectively installed on the two inner sides of the U-shaped frame, the U-shaped frame is rotatably and adjustablely installed on the sliding seat, and the rotation axis of the U-shaped frame extends along the width direction of the paper tube.

[0016] As a further improvement to the above technical solution, a coarse adjustment mechanism is also included. The coarse adjustment mechanism includes a coarse adjustment slide and a coarse adjustment drive assembly that drives the coarse adjustment slide to move along the width direction of the paper tube. The correction sliding frame is slidably installed on the coarse adjustment slide along the width direction of the paper tube.

[0017] As a further improvement to the above technical solution, the glue spraying head includes a head body, which is provided with a heating element, a glue spraying control valve, a glue delivery channel and several nozzles. One end of the glue delivery channel is connected to the glue supply assembly, and the other end of the glue delivery channel is connected to several nozzles through the glue spraying control valve. The heating element is used to heat the head body.

[0018] As a further improvement to the above technical solution, the glue spraying control valve includes a valve cavity disposed in the head body and a valve core slidably installed in the valve cavity. The valve cavity includes a control cavity and a glue inlet cavity. The glue inlet cavity is connected to the glue delivery channel. The glue delivery channel is connected to a plurality of nozzles through the glue inlet cavity. The control cavity is connected to a first air inlet channel and a second air inlet channel. The valve core includes a valve stem and a butterfly valve body. The butterfly valve body is slidably and sealingly disposed in the control cavity to divide the control cavity into a first telescopic cavity and a second telescopic cavity arranged axially. The first telescopic cavity communicates with the first air inlet channel, and the second air inlet channel communicates with the second telescopic cavity. The valve stem is slidably disposed in the glue inlet cavity. The valve stem is used to control the opening and closing of the glue delivery channel and the glue inlet cavity.

[0019] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0021] Figure 1 This is a schematic diagram of an embodiment of the paper tube seam spraying device provided by this utility model;

[0022] Figure 2 yes Figure 1 A magnified view of part A in the middle;

[0023] Figure 3This is a side view of an embodiment of the paper tube seam spraying device provided by this utility model;

[0024] Figure 4 This utility model provides a schematic diagram of the structure of an embodiment of the correction detection component and the paper warping component. Figure 1 ;

[0025] Figure 5 This utility model provides a schematic diagram of the structure of an embodiment of the correction detection component and the paper warping component. Figure 2 ;

[0026] Figure 6 This is a schematic diagram of an embodiment of the correction detection component, paper warping component, and glue spray head provided by this utility model;

[0027] Figure 7 This is a cross-sectional view of an embodiment of the glue spray head provided by this utility model;

[0028] Icon labels:

[0029] Glue spraying mechanism 100; glue spraying head 110; head body 111; heating element 112; glue spraying control valve 113; glue delivery channel 114; nozzle 115; control chamber 116; first air inlet channel 1161; second air inlet channel 1162; first telescopic chamber 1163; second telescopic chamber 1164; glue inlet chamber 117; valve stem 118; butterfly valve body 119; glue supply assembly 120;

[0030] Correction mechanism 200; Correction drive assembly 210; Correction detection assembly 220; Position signal transmitter 221; Position signal receiver 222; U-shaped frame 223; Correction sliding frame 230; Extension seat 231; Sliding seat 232; Locking bolt 233; Paper lifting component 240; Adjustment seat 241;

[0031] 300mm inner paper-plastic composite material;

[0032] 400mm outer paper-plastic composite material;

[0033] Coarse adjustment mechanism 500; coarse adjustment slide 510; coarse adjustment drive assembly 520. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0035] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0037] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0038] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of this utility model, not all embodiments.

[0039] Existing methods for applying adhesive to the seam of paper tubes all use hot melt adhesive extruders, which result in a certain delay in adhesive application. Furthermore, during the paper tube's transport process, the outer edge of the paper-plastic composite material at the seam is prone to deviation, leading to inaccurate adhesive application and affecting the precision of the seam bonding. Therefore, this utility model proposes a paper tube seam adhesive spraying device to solve the above problems.

[0040] like Figures 1 to 7 As shown, the paper tube seam glue spraying device of this utility model includes a glue spraying mechanism 100 and a correction mechanism 200.

[0041] like Figures 1 to 3 As shown, the glue spraying mechanism 100 includes a glue spraying head 110 and a glue supply assembly 120 connected to the glue spraying head 110. The glue supply assembly 120 is used to supply hot melt glue to the glue spraying head 110. In this embodiment, the glue supply assembly 120 includes a hot melt glue container and a spray pump. The inlet of the spray pump is connected to the hot melt glue container, and the outlet of the spray pump is connected to the glue spraying head 110 through a delivery pipe. Under the pumping and pressurization of the spray pump, a high-pressure spraying effect is achieved to avoid delay.

[0042] like Figure 6As shown, during the paper tube forming process, an inner paper-plastic composite material 300 and an outer paper-plastic composite material 400 are formed at the seam of the paper tube. When bonding the seam, it is necessary to spray adhesive on the inner paper-plastic composite material 300 and the outer paper-plastic composite material 400. Generally, adhesive is sprayed on the outer surface of the inner paper-plastic composite material 300, and then the outer paper-plastic composite material 400 is pressed onto the outer surface of the inner paper-plastic composite material 300 to achieve bonding of the seam. Therefore, the adhesive spray head 110 in this embodiment is used to spray adhesive on the outer surface of the inner paper-plastic composite material 300 at the seam of the paper tube.

[0043] like Figures 1 to 3 As shown, the correction mechanism 200 includes a correction drive component 210 and a correction detection component 220. The correction detection component 220 and the glue spray head 110 are arranged sequentially along the paper tube conveying direction. In this embodiment, the paper tube conveying direction is limited to the left and right direction. In some other embodiments, the paper tube conveying direction can be other directions. It can be understood that the correction detection component 220 and the glue spray head 110 are arranged sequentially from left to right.

[0044] The correction detection component 220 is used to detect the position of the edge of the outer paper-plastic composite material 400 at the seam of the paper tube in the width direction of the paper tube. The width direction of the paper tube is set perpendicular to the paper tube conveying direction. In this embodiment, the width direction of the paper tube is limited to the front-back direction. In some other embodiments, the width direction of the paper tube can be other directions.

[0045] In this embodiment, the web correction drive component 210 is signal-connected to the web correction detection component 220. The web correction drive component 210 is used to receive the position signal of the edge of the paper tube seam in the width direction of the paper tube, so as to control the glue spray head 110 and the web correction detection component 220 to move synchronously along the width direction of the paper tube.

[0046] During use, the semi-finished paper tube is conveyed along the paper tube conveying direction. When it passes the correction detection component 220, the correction detection component 220 detects the position of the edge of the outer paper-plastic composite material 400 at the paper tube seam in the paper tube width direction and transmits the position signal to the correction drive component 210. After receiving the position signal, the correction drive component 210 controls the glue spraying head 110 and the correction detection component 220 to move synchronously along the paper tube width direction, so that the glue spraying head 110 sprays glue at the corresponding position on the outer surface of the inner paper-plastic composite material 300 at the paper tube seam, so as to ensure that the glue spraying position in the paper tube width direction is at a set distance from the edge of the outer paper-plastic composite material 400 at the paper tube seam. At the same time, hot melt glue is supplied to the glue spraying head 110 through the glue supply component 120, and the glue is applied by hot melt glue spraying to ensure the accuracy of the paper tube seam bonding.

[0047] Since the distance between the glue spraying position and the edge of the outer paper-plastic composite material 400 at the center seam of the paper tube is different for different types of paper tubes, the relative position between the glue spraying head 110 and the correction detection component 220 in the width direction of the paper tube is adjustable in this embodiment. It can be understood that, depending on the different paper tubes, the distance between the glue spraying head 110 and the correction detection component 220 along the width direction of the paper tube can be adjusted to adjust the distance between the glue spraying position and the edge of the outer paper-plastic composite material 400.

[0048] Among them, such as Figures 1 to 3 As shown, the web guiding mechanism 200 of this embodiment includes a web guiding sliding frame 230. A web guiding drive assembly 210 drives the web guiding sliding frame 230 to reciprocate along the width direction of the paper tube. The web guiding sliding frame 230 is provided with an extension seat 231 extending along the width direction of the paper tube. In this embodiment, the glue spraying head 110 is fixedly mounted on the extension seat 231, and the extension seat 231 is provided with a sliding seat 232 that is slidably adjustable along the width direction of the paper tube. The web guiding detection assembly 220 is mounted on the sliding seat 232. By adjusting the position of the sliding seat 232 in the width direction of the paper tube, the relative position between the web guiding detection assembly 220 and the glue spraying head 110 is adjusted. In some other embodiments, the glue spraying head 110 can be mounted on the sliding seat 232, while the web guiding detection assembly 220 is fixedly mounted on the extension seat 231. The extension seat 231 extends the glue spraying head 110 and the web guiding detection assembly 220 to the center seam of the paper tube.

[0049] Specifically, the sliding seat 232 in this embodiment is provided with a locking bolt 233, which is used to lock the sliding seat 232.

[0050] Furthermore, such as Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, the correction mechanism 200 of this embodiment includes a paper-lifting component 240. The paper-lifting component 240 is disposed upstream of the correction detection component 220 in the paper tube conveying direction. The paper-lifting component 240 is used to slide against the inner surface of the outer paper-plastic composite material 400 at the paper tube seam, so as to separate the outer paper-plastic composite material 400 and the inner paper-plastic composite material 300 at the paper tube seam along a first direction. The first direction is perpendicular to the paper tube width direction and the paper tube conveying direction, respectively. In this embodiment, the first direction is the up-down direction. In order to facilitate the glue spraying head 110 to spray glue and the correction detection component 220 to detect the edge of the outer paper-plastic composite material 400, this embodiment separates the outer paper-plastic composite material 400 and the inner paper-plastic composite material 300 at the paper tube seam along the up-down direction by using the paper-lifting component 240 to form a gap to accommodate the glue spraying head 110. At this time, the outer paper-plastic composite material 400 is lifted up, so that the edge is freed up, so as to facilitate the correction detection component 220 to detect the edge of the outer paper-plastic composite material 400.

[0051] In this embodiment, the paper-tilting component 240 is a guide rod extending along the width direction of the paper tube. The guide rod is movably and adjustablely mounted on the sliding seat 232 relative to the correction detection component 220. The position of the guide rod can be adjusted according to different needs to ensure the separation distance between the outer paper-plastic composite material 400 and the inner paper-plastic composite material 300.

[0052] In this embodiment, one end of the guide rod is connected to an adjustment seat 241. The adjustment seat 241 is rotatably and adjustablely connected to the sliding seat 232, and the adjustment seat 241 is adjustable in the up and down direction.

[0053] The correction detection component 220 of this embodiment includes a position signal radiator 221 and a position signal receiver 222 arranged at intervals and opposite to each other. In use, the position signal radiator 221 and the position signal receiver 222 are respectively located on the inner and outer sides of the outer paper-plastic composite material 400 at the seam of the paper tube. The edge of the outer paper-plastic composite material 400 is detected by the position signal radiator 221 and the position signal receiver 222. The position signal radiator 221 is an infrared generator.

[0054] Specifically, the deviation correction detection component 220 of this embodiment includes a U-shaped frame 223, the opening of which faces the front or rear. A position signal radiator 221 and a position signal receiver 222 are respectively installed on the two inner sides of the U-shaped frame 223. The U-shaped frame 223 is rotatably and adjustablely mounted on a sliding seat 232. The rotation axis of the U-shaped frame 223 extends along the width direction of the paper tube. In use, the edge of the outer paper-plastic composite material 400 is detected by irradiating the edge of the outer paper-plastic composite material 400 through the opening of the U-shaped frame 223 and by the relative illumination of the position signal radiator 221 and the position signal receiver 222. The rotation angle of the U-shaped frame 223 is adjusted according to the conveying direction of the outer paper-plastic composite material 400 so that the line connecting the position signal radiator 221 and the position signal receiver 222 is perpendicular to the outer paper-plastic composite material 400.

[0055] Furthermore, this embodiment also includes a coarse adjustment mechanism 500, which includes a coarse adjustment slide 510 and a coarse adjustment drive assembly 520 that drives the coarse adjustment slide 510 to move along the width direction of the paper tube. The correction slide frame 230 is slidably mounted on the coarse adjustment slide 510 along the width direction of the paper tube. The initial positions of the glue spray head 110 and the correction detection assembly 220 in the front-back direction can be adjusted by the coarse adjustment mechanism 500.

[0056] The coarse adjustment drive component 520 and the correction drive component 210 can adopt linear drive structures such as motor lead screw drive and linear motor.

[0057] Among them, such as Figure 7As shown, the glue spray head 110 of this embodiment includes a head body 111. The head body 111 is provided with a heating element 112, a glue spray control valve 113, a glue delivery channel 114, and a plurality of nozzles 115. One end of the glue delivery channel 114 is connected to the glue supply assembly 120, and the other end of the glue delivery channel 114 is connected to the plurality of nozzles 115 through the glue spray control valve 113. The heating element 112 is used to heat the head body 111. The heating element 112 can ensure the temperature of the head body 111 and prevent the hot melt glue from solidifying in the head body 111. The glue spray control valve 113 is used to control the spraying of the nozzles 115.

[0058] Specifically, the glue spraying control valve 113 in this embodiment includes a valve cavity disposed within the head body 111 and a valve core slidably mounted within the valve cavity. The valve cavity includes a control cavity 116 and a glue inlet cavity 117. A glue delivery channel 114 is connected to the glue inlet cavity 117 and is connected to a plurality of nozzles 115 through the glue inlet cavity 117. The control cavity 116 is connected to a first air inlet channel 1161 and a second air inlet channel 1162. The first air inlet channel 1161 and the second air inlet channel 1162 are respectively connected to an external high-pressure air control mechanism. The valve core includes a valve stem 118 and a butterfly valve body 119. The butterfly valve body 119 is slidably sealed in the control chamber 116 to divide the control chamber 116 into a first telescopic chamber 1163 and a second telescopic chamber 1164 arranged axially. The first telescopic chamber 1163 is connected to the first air intake channel 1161, and the second air intake channel 1162 is connected to the second telescopic chamber 1164. The valve stem 118 is slidably disposed in the glue inlet chamber 117 and is used to control the opening and closing of the glue delivery channel 114 and the glue inlet chamber 117.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A paper tube seam glue spraying device, characterized in that, The application relates to a paper tube middle seam glue spraying device. The glue spraying mechanism comprises a glue spraying head, a glue supply assembly connected with the glue spraying head, and the glue supply assembly is used for supplying hot melt glue to the glue spraying head, and the glue spraying head is used for spraying glue on the outer surface of paper-plastic composite material in the middle seam of the paper tube. The deviation rectifying mechanism comprises a deviation rectifying driving assembly and a deviation rectifying detection assembly, the deviation rectifying detection assembly and the glue spraying head are sequentially arranged along the paper tube conveying direction, the deviation rectifying detection assembly is used for detecting the position of the edge of the outer paper-plastic composite material in the middle seam of the paper tube in the paper tube width direction, the deviation rectifying driving assembly is signal connected with the deviation rectifying detection assembly, the deviation rectifying driving assembly is used for receiving the position signal of the edge of the middle seam of the paper tube in the paper tube width direction, so as to control the glue spraying head and the deviation rectifying detection assembly to synchronously move along the paper tube width direction, and the paper tube width direction is perpendicular to the paper tube conveying direction.

2. The paper tube middle seam glue spraying device according to claim 1, wherein the relative position between the glue spraying head and the deviation rectifying detection assembly in the paper tube width direction is adjustably arranged.

3. The paper tube middle seam glue spraying device according to claim 2, wherein the deviation rectifying mechanism comprises a deviation rectifying sliding frame, the deviation rectifying driving assembly is used for driving the deviation rectifying sliding frame to reciprocally move along the paper tube width direction, the deviation rectifying sliding frame is provided with an extension seat extending along the paper tube width direction, the glue spraying head is fixedly arranged on the extension seat, the extension seat is provided with a sliding seat which is adjustably arranged along the paper tube width direction, and the deviation rectifying detection assembly is arranged on the sliding seat.

4. The paper tube middle seam glue spraying device according to claim 3, wherein the deviation rectifying mechanism comprises a paper lifting piece, the paper lifting piece is arranged on the upstream side of the deviation rectifying detection assembly in the paper tube conveying direction, the paper lifting piece is used for slidingly abutting the inner surface of the outer paper-plastic composite material in the middle seam of the paper tube, so as to separate the outer paper-plastic composite material and the inner paper-plastic composite material in the middle seam of the paper tube along a first direction, and the first direction is perpendicular to the paper tube width direction and the paper tube conveying direction.

5. The paper tube middle seam glue spraying device according to claim 4, wherein the paper lifting piece is a guide rod extending along the paper tube width direction, and the guide rod is adjustably arranged on the sliding seat relative to the deviation rectifying detection assembly.

6. The paper tube middle seam glue spraying device according to claim 4, wherein the deviation rectifying detection assembly comprises a position signal emitter and a position signal receiver which are oppositely arranged, and the position signal emitter and the position signal receiver are arranged on the inner side and the outer side of the outer paper-plastic composite material in the middle seam of the paper tube respectively.

7. The paper tube middle seam glue spraying device according to claim 6, wherein the deviation rectifying detection assembly comprises a U-shaped frame, the position signal emitter and the position signal receiver are arranged on the two inner sides of the U-shaped frame respectively, the U-shaped frame is adjustably arranged on the sliding seat in rotation, and the rotation axis of the U-shaped frame extends along the paper tube width direction.

8. The paper tube middle seam glue spraying device according to claim 3, wherein ​ ​ ​ ​ ​ ​ The device further comprises a coarse adjustment mechanism, which comprises a coarse adjustment slide and a coarse adjustment drive assembly for moving the coarse adjustment slide along the width direction of the paper tube, and the deviation correction slide is slidably mounted on the coarse adjustment slide along the width direction of the paper tube.

9. The paper tube middle seam glue spraying device according to claim 1, characterized in that: The glue spraying head comprises a head body, the head body is provided with a heating element, a glue spraying control valve, a glue conveying channel and a plurality of nozzles, one end of the glue conveying channel is connected with the glue supply assembly, the other end of the glue conveying channel is connected with the plurality of nozzles through the glue spraying control valve, and the heating element is used for heating the head body.

10. The paper tube middle seam glue spraying device according to claim 9, characterized in that: The glue spraying control valve comprises a valve cavity arranged in the head body and a valve core slidably mounted in the valve cavity, the valve cavity comprises a control cavity and a glue inlet cavity, the glue inlet cavity is connected with the glue conveying channel, the glue conveying channel is connected with the plurality of nozzles through the glue inlet cavity, the control cavity is connected with a first air inlet channel and a second air inlet channel, the valve core comprises a valve rod and a butterfly valve body, the butterfly valve body is slidably and sealingly arranged in the control cavity to divide the control cavity into a first expansion cavity and a second expansion cavity arranged in an axial direction, the first expansion cavity is in communication with the first air inlet channel, the second air inlet channel is in communication with the second expansion cavity, and the valve rod is slidably arranged in the glue inlet cavity and is used for controlling the on-off of the glue conveying channel and the glue inlet cavity.

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