A gluing device for a plywood gluing machine

Abstract

The present application provides a kind of plywood glue spreader gluing device, belong to plywood production equipment technical field, including: glue storage barrel, horizontal pipe, pump glue pipeline and back glue pipeline, the inside of the horizontal pipe is equipped with independent glue cavity and backflow cavity;Wherein, the horizontal pipe is equipped with multiple glue outlet pipes and is horizontally arranged along the length direction distribution, the glue outlet pipe is communicated with the glue cavity, the horizontal pipe is equipped with multiple glue extraction pipes and is vertically arranged along the length direction distribution, the glue extraction pipe is communicated with the backflow cavity, by being equipped with the horizontal pipe with glue cavity and backflow cavity, in the process of use, glue cavity is transported glue through glue outlet pipe to glue roll slit of glue spreader, backflow cavity extracts glue in glue roll slit through glue extraction pipe, and transports back glue storage barrel, so that glue in glue roll slit is always in circulating state, avoid the glue precipitation or solidification caused by equipment short-time shutdown maintenance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of plywood production equipment, and particularly relates to a gluing device of a plywood gluing machine. BACKGROUND

[0002] Plywood is a three-layer or multi-layer plate-shaped material formed by wood segments being rotary cut into veneers or thin wood being planed from a wood square and then being glued together by using a glue, and the plywood is mainly glued by using a gluing machine. The gluing machine is used for uniformly applying glue on the surface of a veneer by using two groups of upper and lower glue rollers, storing glue in a gap formed between the two groups of glue rollers, and rotating the glue rollers to uniformly apply glue on the surface of the glue rollers and then on the surface of the veneer.

[0003] At present, when the gluing device of the gluing machine adds glue, the glue is directly delivered into the gap between the two glue rollers of each group, and only the delivery of the glue can be performed. The glue in the gap cannot be circulated, and when the equipment is stopped, the glue stored in the gap is prone to precipitation under the condition of not flowing, which leads to uneven gluing of the veneer. In the case of a long downtime, the glue may even solidify, increasing the workload of equipment maintenance. SUMMARY

[0004] In view of the above problems, the gluing device of the plywood gluing machine is provided to at least partially solve the above problems.

[0005] The technical scheme adopted by the application is as follows: the gluing device of the plywood gluing machine comprises:

[0006] A glue storage barrel is provided with a glue pumping pipeline and a glue returning pipeline;

[0007] A horizontal pipe is arranged in parallel to the glue roller, and the inside of the horizontal pipe is provided with a glue feeding cavity and a return cavity which are independent of each other. The glue pumping pipeline is connected with the glue feeding cavity, and the glue returning pipeline is connected with the return cavity.

[0008] The horizontal pipe is provided with a plurality of glue outlet pipes which are distributed along the length direction and arranged horizontally, the glue outlet pipes are communicated with the glue feeding cavity and are used for delivering glue, and the horizontal pipe is provided with a plurality of glue suction pipes which are distributed along the length direction and arranged vertically, the glue suction pipes are communicated with the return cavity and are used for sucking glue, so that the glue in the gluing machine forms an external circulation.

[0009] The horizontal pipe is further provided with a first turnover mechanism for controlling the opening and closing of the glue outlet pipes and a second turnover mechanism for controlling the opening and closing of the glue suction pipes.

[0010] Further, the first turnover mechanism comprises a first motor and two symmetrically arranged first baffles, the two first baffles are arranged in the glue feeding cavity and are attached to the inner wall of the glue feeding cavity, the two first baffles are connected to the output shaft of the first motor and are driven to rotate by the first motor.

[0011] Further, one end of the cross pipe is provided with a first connecting pipe which is in communication with the glue feeding cavity and is coaxially arranged, the first motor is arranged on the first connecting pipe, and the output shaft of the first motor extends into the glue feeding cavity through the first connecting pipe.

[0012] Further, the second turnover mechanism comprises a second motor and a second baffle, the second baffle is arranged in the return flow cavity and is attached to the inner wall of the return flow cavity, the second baffle is connected to the output shaft of the second motor and is driven to rotate by the second motor.

[0013] Further, one end of the cross pipe is provided with a second connecting pipe which is in communication with the return flow cavity and is coaxially arranged, the second motor is arranged on the second connecting pipe, and the output shaft of the second motor extends into the return flow cavity through the second connecting pipe.

[0014] Further, the glue feeding pipe and the conveying pump are connected in series, one end of the glue feeding pipe is connected to the glue storage barrel, and the other end of the glue feeding pipe is connected to the first connecting pipe.

[0015] Further, the glue return pipe and the return flow pump are connected in series, one end of the glue return pipe is connected to the glue storage barrel, and the other end of the glue return pipe is connected to the second connecting pipe.

[0016] Further, one end of the cross pipe is provided with a circulation pipe, the two ends of the circulation pipe are in communication with the glue feeding cavity and the return flow cavity respectively, and a valve is arranged on the circulation pipe, when the first turnover mechanism and the second turnover mechanism are closed and the valve is opened, the glue in the glue feeding cavity and the return flow cavity can form an internal circulation.

[0017] Further, a heating cavity is arranged in the cross pipe along the length direction, an electric heating wire for heating is arranged in the heating cavity, the electric heating wire is laid along the length direction of the cross pipe, and the length of the electric heating wire is the same as the length of the glue feeding cavity and the return flow cavity.

[0018] Further, a plurality of air outlets are arranged on the two sides of the cross pipe along the length direction, the air outlets are in communication with the heating cavity, one end of the cross pipe is provided with an air connection pipe, one end of the air connection pipe is in communication with the heating cavity, and the other end of the air connection pipe is connected to an external air supply device.

[0019] The beneficial effects achieved by the present application with the above structure are as follows:

[0020] 1. By setting the cross pipe with glue feeding cavity and reflux cavity, in the process of use, glue is fed to the glue roller slit of the glue applicator by the glue feeding cavity to realize glue feeding to the glue applicator, at the same time, the glue in the glue roller slit is extracted by the reflux cavity to keep the glue in the glue roller slit in a circulating state, avoiding glue precipitation or solidification caused by short-time equipment downtime for maintenance.

[0021] 2. By setting the circulation pipe connecting the glue feeding cavity and the reflux cavity at one end of the cross pipe, and setting the valve on the circulation pipe, when the equipment needs long-time downtime for maintenance, the valve is opened to make the glue feeding cavity and the reflux cavity communicate, at the same time, the feeding pump on the glue feeding pipe continuously pumps and the reflux pump on the glue return pipe continuously pumps to make the glue in the glue feeding cavity, the reflux cavity, the glue feeding pipe and the glue return pipe form internal circulation, and the glue continuously flows to avoid solidification and pipeline blockage caused by long-term non-flowing of the glue. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A structure diagram of a glue feeding device of a plywood glue applicator is provided for the embodiment of the present application.

[0023] Figure 2 A position diagram of the cross pipe in the glue roller slit of a glue feeding device of a plywood glue applicator is provided for the embodiment of the present application.

[0024] Figure 3 An internal structure diagram of the cross pipe of a glue feeding device of a plywood glue applicator is provided for the embodiment of the present application.

[0025] Figure 4 A cross-sectional structure diagram of the cross pipe of a glue feeding device of a plywood glue applicator is provided for the embodiment of the present application.

[0026] Figure 5 A structure diagram of a first turnover mechanism of a glue feeding device of a plywood glue applicator is provided for the embodiment of the present application.

[0027] Figure 6 A structure diagram of a second turnover mechanism of a glue feeding device of a plywood glue applicator is provided for the embodiment of the present application.

[0028] Figure 7 A diagram of the first turnover mechanism and the second turnover mechanism of a glue feeding device of a plywood glue applicator in a closed state is provided for the embodiment of the present application.

[0029] Among them, 100 is a glue storage tank; 1 is a horizontal pipe; 11 is a glue outlet pipe; 12 is a glue extraction pipe; 13 is a first connecting pipe; 14 is a second connecting pipe; 15 is an air inlet pipe; 101 is a glue delivery chamber; 102 is a return chamber; 103 is a heating chamber; 104 is an air outlet; 2 is a glue delivery pipe; 21 is a delivery pump; 3 is a return pipe; 31 is a return pump; 4 is a first motor; 41 is a first baffle; 5 is a second motor; 51 is a second baffle; 6 is a circulation pipe; 61 is a valve; and 7 is a heating wire.

[0030] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 invention.

[0033] like Figure 1 As shown, the present invention proposes a glue application device for a plywood glue applicator, including a glue storage tank 100, a horizontal pipe 1, a glue pumping pipeline, and a glue return pipeline.

[0034] A glue storage tank 100 is separately installed on one side of the glue applicator for storing glue. A horizontal tube 1 is installed within the slit of the glue roller of the glue applicator and is arranged parallel to the direction of the glue roller (e.g., ...). Figure 2 (as shown)

[0035] One end of the glue pumping pipeline is connected to the glue storage tank 100, and the other end of the glue pumping pipeline is connected to the horizontal pipe 1 and communicates with the glue delivery chamber 101. The glue stored in the glue storage tank 100 is pumped into the glue delivery chamber 101 through the glue pumping pipeline. One end of the glue return pipeline is connected to the glue storage tank 100, and the other end of the glue return pipeline is connected to the horizontal pipe 1 and communicates with the return chamber 102. The glue in the return chamber 102 is pumped back into the glue storage tank 100 through the glue return pipeline, so that the return chamber 102 forms a negative pressure.

[0036] CombinationFigure 1 、 Figure 3 and Figure 4 As shown in

[0037] The cross pipe 1 is provided with a plurality of glue outlet pipes 11 distributed along the length direction and arranged horizontally, the glue outlet pipes 11 are communicated with the glue feeding cavity 101, when the glue in the glue storage barrel 100 is pumped into the glue feeding cavity 101 by the glue feeding pipeline, the pressure in the glue feeding cavity 101 increases, so that the glue in the glue feeding cavity 101 can be output to the glue roller slit of the glue coating machine through the glue outlet pipes 11, and the glue coating of the glue coating machine is completed.

[0038] In this way, during use, the glue is transported to the glue roller slit of the glue coating machine by the glue outlet pipes 11, and the glue in the glue roller slit is extracted by the glue extraction pipes 12, so that the glue in the glue roller slit is always in a circulating state, avoiding glue precipitation or solidification caused by short-term shutdown of the equipment for maintenance.

[0039] At the same time, when there is too much glue in the glue roller slit, the excess glue can be extracted back into the glue storage barrel 100 by increasing the glue extraction amount of the glue return pipeline, avoiding glue overflow.

[0040] It should be understood that in the initial stage of starting, a certain amount of glue is first transported into the glue roller slit to meet the demand of glue adhesion, and then the glue extraction of the glue return pipeline is started, and the transportation capacity of the glue is the sum of the glue consumption of the glue coating machine and the glue extraction amount, so that the glue storage in the glue roller slit is in a balanced state, meeting the glue coating amount, avoiding glue overflow caused by too much glue, and keeping the glue in a circulating state.

[0041] As shown in Figure 4 and Figure 7 The cross pipe 1 is provided with a first turnover mechanism and a second turnover mechanism, respectively used for controlling the opening and closing of the glue outlet pipes 11 and the glue extraction pipes 12.

[0042] One end of the cross pipe 1 is provided with a circulation pipe 6, two ends of the circulation pipe 6 are respectively communicated with the glue feeding cavity 101 and the backflow cavity 102, and the circulation pipe 6 is provided with a valve 61, when the glue is transported to the glue coating machine, the valve 61 is in a closed state, and the glue feeding cavity 101 and the backflow cavity 102 are not communicated with each other.

[0043] When the device needs to be shut down for a long time for maintenance, both the first and second turning mechanisms are closed, at which time the glue outlet pipe 11 and the glue suction pipe 12 are both in a closed state, then the valve 61 is opened, so that the glue feeding cavity 101 and the glue return cavity 102 are communicated, at the same time, the glue pumping pipe continuously pumps and the glue return pipe continuously pumps, so that the glue in the glue feeding cavity 101, the glue return cavity 102, the glue pumping pipe and the glue return pipe forms an internal circulation (as shown in Figure 3 , the glue continuously flows, avoiding the glue from solidifying and blocking the pipe due to long-term non-flowing.

[0044] As shown in Figure 5 , the first turning mechanism includes a first motor 4 and two symmetrically arranged first baffles 41, the two first baffles 41 are arranged in the glue feeding cavity 101, the first baffle 41 is arranged in a circular arc shape which is attached to the inner wall of the glue feeding cavity 101, so that the first baffle 41 can be attached to the inner wall of the glue feeding cavity 101, the two first baffles 41 are connected to the output shaft of the first motor 4 and are driven to rotate by the first motor 4;

[0045] When the first baffle 41 rotates to a position where the glue outlet pipe 11 is communicated with the glue feeding cavity 101 (as shown in Figure 7 ), the first baffle 41 closes the end of the glue outlet pipe 11, so that the glue outlet pipe 11 is not communicated with the glue feeding cavity 101, thereby closing the glue outlet pipe 11.

[0046] As shown in Figure 6 , the second turning mechanism includes a second motor 5 and a second baffle 51, the second baffle 51 is arranged in the glue return cavity 102, the second baffle 51 is arranged in a circular arc shape which is attached to the inner wall of the glue return cavity 102, so that the second baffle 51 can be attached to the inner wall of the glue return cavity 102, the second baffle 51 is connected to the output shaft of the second motor 5 and is driven to rotate by the second motor 5;

[0047] When the second baffle 51 rotates to a position where the glue suction pipe 12 is communicated with the glue return cavity 102 (as shown in Figure 7 ), the second baffle 51 closes the end of the glue suction pipe 12, so that the glue suction pipe 12 is not communicated with the glue return cavity 102, thereby closing the glue suction pipe 12.

[0048] In a specific embodiment, one end of the cross pipe 1 is provided with a first connecting pipe 13 which is communicated with the glue feeding cavity 101 and coaxially arranged, the first motor 4 is arranged on the first connecting pipe 13, the output shaft of the first motor 4 is extended into the glue feeding cavity 101 through the first connecting pipe 13, the axial length of the glue feeding cavity 101 is extended through the first connecting pipe 13, which provides installation space for the glue pumping pipe while meeting the installation of the first motor 4.

[0049] In a specific embodiment, one end of the cross pipe 1 is provided with a second connecting pipe 14 in communication with the return cavity 102 and coaxially arranged, the second motor 5 is arranged on the second connecting pipe 14, the output shaft of the second motor 5 extends into the return cavity 102 through the second connecting pipe 14, the axial length of the return cavity 102 is extended through the second connecting pipe 14, and installation space is provided for the glue return pipeline while meeting the installation of the second motor 5.

[0050] In an optional embodiment, the first motor 4 and the second motor 5 are both step motors, the rotation angle of which can be controlled, so as to accurately control the rotation angle of the first baffle 41 and the second connecting pipe 14.

[0051] In combination Figure 1 As shown, the glue feeding pipeline includes the glue feeding pipe 2 and the delivery pump 21, the delivery pump 21 is connected in series on the glue feeding pipe 2, one end of the glue feeding pipe 2 is connected with the glue storage barrel 100, the other end of the glue feeding pipe 2 is connected to the first connecting pipe 13, under the action of the delivery pump 21, the glue in the glue storage barrel 100 is delivered into the glue feeding cavity 101 through the glue feeding pipe 2 and the first connecting pipe 13 in turn.

[0052] The glue return pipeline includes the glue return pipe 3 and the return pump 31, the return pump 31 is connected in series on the glue return pipe 3, one end of the glue return pipe 3 is connected with the glue storage barrel 100, the other end of the glue return pipe 3 is connected to the second connecting pipe 14, under the action of the return pump 31, the glue in the return cavity 102 is delivered into the glue storage barrel 100 through the second connecting pipe 14 and the glue return pipe 3 in turn.

[0053] In combination Figure 3 and Figure 4 As shown, the cross pipe 1 is provided with a heating cavity 103 along the length direction, and the heating cavity 103 is provided with an electric heating wire 7 for heating, when the air temperature is low, the electric heating wire 7 in the heating cavity 103 is used to heat, the temperature in the glue feeding cavity 101 and the return cavity 102 is increased, and the power of the electric heating wire 7 is controlled to make the temperature at room temperature or the suitable temperature of the glue, so as to maintain the flowability of the glue and avoid the phenomenon of insufficient and uneven coating of the glue caused by low temperature.

[0054] Further, the electric heating wire 7 is laid along the length direction of the cross pipe 1, and the length of the electric heating wire 7 is the same as the length of the glue feeding cavity 101 and the return cavity 102, so that the electric heating wire 7 can cover the entire length of the glue feeding cavity 101 and the return cavity 102, and the heating effect is improved.

[0055] In combination Figure 1As shown, a plurality of air outlets 104 are arranged on both sides of the transverse pipe 1 along the length direction, the air outlets 104 are communicated with the heating cavity 103, one end of the transverse pipe 1 is provided with a gas connecting pipe 15, one end of the gas connecting pipe 15 is communicated with the heating cavity 103, the other end of the gas connecting pipe 15 is connected with an external air supply device, the air supply device transports air into the heating cavity 103 through the gas connecting pipe 15, the air is heated by the heating wire 7 and then is blown out of the air outlets 104 and is blown to the surface of the glue applying roller, so that the surface of the glue applying roller is heated and the liquidity of the glue on the surface of the glue applying roller is maintained, and the phenomenon of insufficient glue coating and uneven glue coating caused by low temperature is avoided.

[0056] The working principle of the present application is as follows: under the action of the delivery pump 21, the glue in the glue storage barrel 100 is delivered into the glue feeding cavity 101 through the glue feeding pipe 2 and the first connecting pipe 13 in sequence, the pressure in the glue feeding cavity 101 is increased, so that the glue in the glue feeding cavity 101 can be output to the glue roller slit of the glue applying machine through the glue outlet pipe 11, the glue applying process of the glue applying machine is completed, and in the initial stage of starting, a certain amount of glue is delivered into the glue roller slit, so that the glue in the glue roller slit forms a certain storage amount, meeting the demand of glue adhesion, then the backflow pump 31 is started, under the suction action of the backflow pump 31, the glue in the glue roller slit can be extracted by the glue extraction pipe 12 and then is backflowed into the glue storage barrel 100 through the backflow cavity 102, the second connecting pipe 14 and the glue backflow pipe 3 in sequence, so that the glue in the glue roller slit of the glue applying machine forms an external circulation, avoiding the glue precipitation or solidification caused by short-time shutdown and maintenance of the equipment;

[0057] When the equipment needs to be shutdown and maintained for a long time, the first and second turnover mechanisms are all closed, at this time, the glue outlet pipe 11 and the glue extraction pipe 12 are both in the closed state, then the valve 61 is opened, so that the glue feeding cavity 101 and the backflow cavity 102 are communicated, at the same time, the glue pumping pipe is continuously pumped and the glue backflow pipe is continuously pumped, so that the glue in the glue feeding cavity 101, the backflow cavity 102, the glue pumping pipe and the glue backflow pipe forms an internal circulation (as shown in the figure), the glue continuously flows, avoiding the glue solidification caused by long-term non-flowing. Figure 3

[0058] In summary of the above embodiments: by arranging the transverse pipe 1 with the glue feeding cavity 101 and the backflow cavity 102, in the process of use, the glue feeding cavity 101 is used to deliver the glue to the glue roller slit of the glue applying machine, and the backflow cavity 102 is used to extract the glue in the glue roller slit, so that the glue in the glue roller slit is always in a circulating state, avoiding the glue precipitation or solidification caused by short-time shutdown and maintenance of the equipment;

[0059] ​A circulation pipe 6 connecting the glue feeding cavity 101 and the return cavity 102 is arranged at one end of the cross pipe 1, and a valve 61 is arranged on the circulation pipe 6. When the valve 61 is opened, the glue feeding cavity 101 and the return cavity 102 are communicated, at the same time, the conveying pump 21 on the glue feeding pipe 2 continuously pumps, and the return pump 31 on the glue return pipe 3 continuously pumps, so that the glue in the glue feeding cavity 101, the return cavity 102, the glue feeding pipe 2 and the glue return pipe 3 forms an internal circulation (as shown in Figure 3 The glue continuously flows, and the glue is prevented from solidifying and blocking the pipeline due to long-term non-flowing.

[0060] It should be understood that the cross pipe 1, the glue feeding pipeline and the glue return pipeline form a group, and each group can supply glue to a pair of glue applying rollers (as shown in Figure 2 It should be understood that the cross pipe 1, the glue feeding pipeline and the glue return pipeline form a group, and each group can supply glue to a pair of glue applying rollers (as shown in

[0061] It should be understood that the cross pipe 1, the glue feeding pipeline and the glue return pipeline form a group, and each group can supply glue to a pair of glue applying rollers (as shown in

[0062] The above describes the present application and its embodiments, which is not limited, and the drawings only show one of the embodiments of the present application, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired by it, without departing from the purpose of the present application, without creative design, similar structure and embodiments of the technical solution can be designed, which should belong to the protection scope of the present application.

Claims

1. A gluing device for a plywood gluing machine, characterized in that, The application relates to a glue feeding device for a glue coating machine. The glue feeding device comprises a glue storage barrel (100) provided with a glue feeding pipe and a glue returning pipe; a horizontal pipe (1) arranged in parallel to a glue coating roller, the inside of the horizontal pipe (1) being provided with a glue feeding cavity (101) and a glue returning cavity (102) which are independent of each other, the glue feeding pipe being connected with the glue feeding cavity (101), and the glue returning pipe being connected with the glue returning cavity (102); wherein a plurality of glue outlet pipes (11) are arranged on the horizontal pipe (1) and are distributed along the length direction and arranged horizontally, the glue outlet pipes (11) being communicated with the glue feeding cavity (101) and being used for conveying glue, a plurality of glue suction pipes (12) are arranged on the horizontal pipe (1) and are distributed along the length direction and arranged vertically, the glue suction pipes (12) being communicated with the glue returning cavity (102) and being used for sucking glue, so that the glue in the glue coating machine forms an external circulation; the horizontal pipe (1) is further provided with a first turnover mechanism used for controlling the opening and closing of the glue outlet pipes (11) and a second turnover mechanism used for controlling the opening and closing of the glue suction pipes (12); the first turnover mechanism comprises a first motor (4) and two symmetrically arranged first baffles (41), the two first baffles (41) are arranged in the glue feeding cavity (101) and are attached to the inner wall of the glue feeding cavity (101), the two first baffles (41) are connected to the output shaft of the first motor (4) and are driven to rotate by the first motor (4); a heating cavity (103) is arranged in the horizontal pipe (1) along the length direction, an electric heating wire (7) used for heating is arranged in the heating cavity (103), the electric heating wire (7) is laid along the length direction of the horizontal pipe (1), and the length of the electric heating wire (7) is the same as the lengths of the glue feeding cavity (101) and the glue returning cavity (102). One end of the horizontal pipe (1) is provided with a first connecting pipe (13) which is communicated with the glue feeding cavity (101) and is coaxially arranged, the first motor (4) is arranged on the first connecting pipe (13), and the output shaft of the first motor (4) is extended into the glue feeding cavity (101) through the first connecting pipe (13). The second turnover mechanism comprises a second motor (5) and a second baffle (51), the second baffle (51) is arranged in the glue returning cavity (102) and is attached to the inner wall of the glue returning cavity (102), the second baffle (51) is connected to the output shaft of the second motor (5) and is driven to rotate by the second motor (5). One end of the horizontal pipe (1) is provided with a second connecting pipe (14) which is communicated with the glue returning cavity (102) and is coaxially arranged, the second motor (5) is arranged on the second connecting pipe (14), and the output shaft of the second motor (5) is extended into the glue returning cavity (102) through the second connecting pipe (14). The glue feeding pipe comprises a glue feeding pipe (2) and a conveying pump (21), the conveying pump (21) is connected in series on the glue feeding pipe (2), one end of the glue feeding pipe (2) is connected with the glue storage barrel (100), and the other end of the glue feeding pipe (2) is connected to the first connecting pipe (13). ​ 2. The gluing device for a plywood gluing machine according to claim 1, characterized in that: ​ 3. The gluing device for gluing plate according to claim 1, characterized in that: ​ 4. The gluing device for a plywood gluing machine according to claim 3, characterized in that: ​ 5. The gluing device for gluing plate according to claim 2, characterized in that: ​ 6. The gluing device for gluing plate according to claim 4, characterized in that: The glue return pipeline comprises a glue return pipe (3) and a return pump (31), the return pump (31) is connected in series on the glue return pipe (3), one end of the glue return pipe (3) is connected with the glue storage barrel (100), and the other end of the glue return pipe (3) is connected to the second connecting pipe (14).

7. The gluing device for gluing board according to claim 1, characterized in that: One end of the cross pipe (1) is provided with a circulating pipe (6), two ends of the circulating pipe (6) are respectively communicated with the glue feeding cavity (101) and the return cavity (102), and a valve (61) is arranged on the circulating pipe (6); when the first and second overturning mechanisms are closed, the valve (61) is opened, so that the glue in the glue feeding cavity (101) and the return cavity (102) can form internal circulation.

8. The gluing apparatus for gluing board according to claim 1, characterized in that: A plurality of air outlet holes (104) are arranged on the length direction of the two sides of the cross pipe (1), the air outlet holes (104) are communicated with the heating cavity (103), one end of the cross pipe (1) is provided with an air connection pipe (15), one end of the air connection pipe (15) is communicated with the heating cavity (103), and the other end of the air connection pipe (15) is connected with external air supply equipment.

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