A cleaning structure of a spray gun of a glue sprayer, the spray gun and the glue sprayer

Abstract

The application discloses a cleaning structure of a glue spraying machine, which comprises an inner cavity, a glue supply pipe and a nozzle, the glue supply pipe is communicated with the inner cavity, the inner cavity is communicated with the nozzle, further comprises a cleaning pipe, one end of the cleaning pipe is communicated with the inner cavity of the nozzle and is used for flushing the inner cavity of the nozzle, a recovery pipe, one end of the recovery pipe is communicated with the inner cavity of the nozzle and is used for collecting the cleaning liquid after flushing, and an opening and closing device, the opening and closing device is used for closing the nozzle before cleaning the inner cavity, in such a way that the cleaning liquid flows into the recovery pipe after completing the cleaning of the inner cavity. The cleaning liquid can be collected into a waste liquid tank, and the adverse effects on the human body and the environment are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shoe glue spraying, in particular to a cleaning structure of a glue spraying gun of a glue spraying machine, and a glue spraying gun and a glue spraying machine comprising the cleaning structure. BACKGROUND

[0002] In a shoe production line, a glue spraying machine is mainly used to spray shoe glue on the surface of a shoe sole and an upper part. The shoe industry is a labor-intensive industry and is still a low degree of automation industry. Therefore, the glue spraying operation is easily affected and restricted by the previous process, especially in a shoe production line, the previous process does not always timely deliver corresponding parts at the same time interval. Due to the interval or waiting time of two operations, the glue adhered to the inside of the glue spraying gun of the glue spraying machine will produce a solidification reaction, which affects the glue spraying quality.

[0003] A glue spraying robot gun cleaning structure and a cleaning method thereof are disclosed in Chinese patent (Patent No. CN202110712188.2), which solves the problem of glue solidification in the inside of the glue spraying gun by cleaning the glue spraying gun. In the shoe industry, the commonly used glue of the glue spraying machine is white glue, and the effective component of which is usually rubber. The main component of the commonly used glue cleaning agent generally includes volatile organic compounds, such as cleaning agents with codes 202 and 206, which contain components such as acetone. Some use industrial alcohol or water-based cleaning agents. As mentioned above, the deficiency is that in the above-mentioned patent, the cleaning liquid is sprayed out from the blowing hole after completing the cleaning of the glue spraying gun. The volatile organic compounds contained in the cleaning liquid will have adverse effects on the human body and the environment. In addition, the solvent in the glue liquid adhered to the glue spraying gun will quickly volatilize and evaporate, causing the glue liquid to tend to solidify (solvent reduction). When the glue liquid is sprayed onto the shoe material, it will to some extent cause the solidification time to be shortened, affecting the bonding quality. Therefore, after a long interval or waiting, even if the glue liquid on the glue gun has not solidified, when the glue spraying is re-performed, preventive cleaning is usually required. The cleaning frequency of the glue gun is relatively high, which further amplifies the above-mentioned adverse consequences. SUMMARY

[0004] In order to solve the above-mentioned defects, the purpose of the present application is to provide a cleaning structure capable of collecting cleaning waste liquid. The purpose of the present application is also to provide a glue spraying gun comprising the above-mentioned cleaning structure. The purpose of the present application is also to provide a glue spraying machine comprising the above-mentioned glue spraying gun.

[0005] For this purpose, the cleaning structure of the glue spraying machine gun of the present application, the gun comprises a cavity, a glue supply pipe and a nozzle, the glue supply pipe is communicated with the cavity, the cavity is communicated with the nozzle, characterized in that: further comprising a cleaning pipe, one end of the cleaning pipe is communicated with the cavity of the gun, for flushing the cavity of the gun; and a recovery pipe, one end of the recovery pipe is communicated with the cavity of the gun, for collecting the cleaning liquid after flushing; and an opening and closing device, the opening and closing device is used to close the nozzle before cleaning the cavity, in such a way that the cleaning liquid flows into the recovery pipe after completing the cleaning of the cavity.

[0006] Further, the opening and closing device comprises a plug body and a cylinder, the plug body is connected with the cylinder, the plug body cooperates with the side wall of the cavity to form a seal and can move along the cavity under the push of compressed gas and close the nozzle, in such a way that the glue in the cavity and the nozzle is squeezed out of the gun before the nozzle is closed.

[0007] Further, it further comprises: a liquid storage tank for storing cleaning liquid; and a circulating tank, one end of the cleaning pipe, one end of the recovery pipe and the liquid storage tank are connected with the circulating tank; and a waste liquid tank, the waste liquid tank is connected with the circulating tank through a liquid discharge pipe, for storing cleaning waste liquid; the liquid storage tank supplies a predetermined amount of cleaning liquid to the circulating tank, the cleaning liquid in the circulating tank flushes the cavity through the cleaning pipe, and flows back to the circulating tank through the recovery pipe, the cleaning liquid in the circulating tank is used repeatedly for several times, when the circulating cleaning reaches a predetermined number of times, the circulating tank opens the liquid discharge pipe to discharge the liquid in the circulating tank into the waste liquid tank.

[0008] Further, the gun comprises a mounting groove, a cylinder is arranged in the mounting groove, the connecting part of the mounting groove and the cavity forms a limiting part for the inward movement of the plug body, and the recovery pipe is connected with the mounting groove.

[0009] Further, the first plunger valve is arranged in a first stepped hole of the circulating tank, the first stepped hole is connected with the recovery pipe, a valve core of the first plunger valve is connected with a stepped surface of the first stepped hole through a spring, one end of the valve core protrudes from the first stepped hole and is provided with a ratchet, the second plunger valve is arranged in a second stepped hole of the circulating tank, the second stepped hole is connected with the liquid discharge pipe, a valve core of the second plunger valve is connected with a stepped surface of the second stepped hole through a spring, and a ratchet wheel is fixed on an inner wall of the circulating tank and matched with the ratchet on the valve core; a floating rack is arranged in a T-shaped groove in a bottom base of the circulating tank, the floating rack is fixed on a floating block, the floating block is arranged in the T-shaped groove, one end of the floating block is connected with the valve core of the second plunger valve through a connecting rope, when the liquid in the circulating tank exceeds the height of the bottom base, the floating rack floats and exposes from the T-shaped groove; a gear is fixed on the inner wall of the circulating tank and matched with the floating rack in the floating state; and a transmission device is connected with the gear and the ratchet wheel, so that when the ratchet drives the ratchet wheel to rotate, the gear is driven to rotate and drives the floating rack in the floating state to move.

[0010] Further, the connecting end of the cleaning pipe with the circulating tank is higher than the height of the floating state of the floating rack.

[0011] Further, the transmission device comprises a transmission wheel connected with the ratchet wheel and the gear and a transmission belt connecting the upper and lower transmission wheels, the transmission wheel comprises clamping portions on two sides, the transmission belt is clamped in the clamping portions, and the transmission wheel and the transmission belt are arranged outside the circulating tank.

[0012] The transmission device can further comprise a sprocket and a chain.

[0013] The application further comprises a spray gun of a glue spraying machine, comprising the cleaning structure.

[0014] The application further comprises a glue spraying machine, comprising the spray gun.

[0015] The application has the following beneficial effects:

[0016] (1) The cleaning structure of the spray gun of the glue spraying machine comprises a cleaning pipe, a recovery pipe and an opening and closing device of a nozzle, one end of the cleaning pipe is communicated with an inner cavity of the spray gun and is used for flushing the inner cavity of the spray gun, one end of the recovery pipe is communicated with the inner cavity of the spray gun and is used for collecting the cleaning liquid after flushing, and the opening and closing device is used for closing the nozzle before the inner cavity is cleaned, the cleaning liquid after the spray gun is cleaned is recovered through the recovery pipe, and the harm of the cleaning liquid sprayed during cleaning to the human body and the environment is avoided.

[0017] (2) In the specific embodiment of the application, the same batch of cleaning liquid can be used for multiple times of flushing through the arrangement of the circulating tank, the use amount of the cleaning liquid is reduced, the use amount of the organic cleaning agent is reduced, and the generation amount of waste is reduced.

[0018] (3) In order to improve the number of times of recycling the cleaning liquid and further reduce the amount of cleaning agent, in the specific embodiment of the present application, the plug body is arranged in the inner cavity, the nozzle is closed by the plug body, and the plug body is moved along the inner cavity to push out the glue liquid filled in the inner cavity from the nozzle. After the extrusion of the plug body, only a small part of the glue liquid adhered to the inner wall remains in the inner cavity, so that the subsequent cleaning liquid flushing is more thorough, and the amount of glue liquid dissolved in the cleaning liquid is greatly reduced. Since the cleaning effect of the cleaning liquid will decrease after multiple cycles, the embodiment of the present application can maintain better cleaning effect under the same number of cycles within a certain period of time, so that the cleaning liquid in the circulating tank can be recycled more times. In addition, after cleaning, a heating device is usually arranged to volatilize the cleaning agent adhered in the inner cavity, which is also not conducive to the environment. In the embodiment, the cleaning agent in the inner cavity is pushed into the recovery pipe through the reset of the plug body, so that the amount of residual cleaning agent in the inner cavity is greatly reduced, which is conducive to the environment and human health. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the glue spraying machine of the present application;

[0020] Figure 2 It is a sectional view of the spray gun of the glue spraying machine of the present application;

[0021] Figure 3 It is a schematic diagram of the liquid storage device arranged in the cabinet body of the glue spraying machine;

[0022] Figure 4 It is a sectional view of the circulating tank;

[0023] Figure 5 It is a schematic diagram of the transmission device;

[0024] Figure 6 It is a schematic diagram of the transmission wheel;

[0025] Figure 7 It is a top view of the floating rack.

[0026] BRIEF DESCRIPTION OF DRAWINGS:

[0027] 1. The spray gun; 101. The installation groove; 2. The inner cavity; 3. The glue supply pipe; 4. The cleaning pipe; 5. The recovery pipe; 6. The nozzle; 7. The on-off device; 701. The plug body; 702. The air cylinder; 703. The protruding part; 704. The limiting part; 8. The air cap; 9. The three-way valve; 10. The glue barrel; 11. The liquid storage tank; 12. The waste liquid tank; 13. The air pipe; 14. The step outer wall; 15. The circulating tank; 151. The liquid inlet hole; 152. The liquid outlet hole; 153. The first step hole; 154. The second step hole; 155. The first plunger valve; 156. The second plunger valve; 157. The valve core; 158. The ratchet; 16. The ratchet wheel; 17. The liquid discharge pipe; 18. The connecting rope; 19. The suspended rack; 20. The base; 201. The inverted T-shaped groove; 21. The transmission wheel; 211. The clamping part; 22. The cabinet; 23. The operation table; 24. The partition; 25. The air suction port; 26. The air passage; 27. The spring; 28. The gear; 29. The transmission belt. DETAILED DESCRIPTION

[0028] In order to further clarify the technical means and effects of the present application for achieving the predetermined purposes, the specific embodiments, structures, features and effects according to the present application are described in detail as follows in combination with the drawings and preferred embodiments.

[0029] REFERENCE Figures 1 to 7As shown, the cleaning structure of the glue spraying gun of the present application, the glue spraying gun 1 comprises an inner cavity 2, a glue supply pipe 3, a cleaning pipe 4, a recovery pipe 5, a nozzle 6, an opening and closing device 7 of the nozzle and an air cap 8, the glue supply pipe 3, the cleaning pipe 4 and the recovery pipe 5 can all communicate with the inner cavity 2, the glue supply pipe 3 and the cleaning pipe 4 are jointly connected into the inner cavity 2 of the glue spraying gun 1 through a three-way valve 9, the other end of the glue supply pipe 3 communicates with a glue barrel 10, and the other end of the cleaning pipe 4 communicates with a cleaning liquid storage device, the glue or the liquid is supplied in a pneumatic mode, for example, a pneumatic diaphragm pump is used, when the glue supply pipe 3 is opened, the cleaning pipe 4 is closed, when the cleaning pipe 4 is opened, the glue supply pipe 3 is closed, the glue spraying gun 1 body is provided with a stepped outer wall 14, the stepped outer wall 14 is respectively provided with threads, and is respectively used for threadedly connecting with the nozzle 6 and the air cap 8, the air cap 8 is arranged outside the nozzle 6, an air channel 26 is arranged in the air cap 8, the air channel 26 leads to the nozzle 6, so that the compressed gas is mixed with the glue liquid at the nozzle contraction for atomizing the glue liquid, the atomization degree is adjusted by rotating the air cap 8, since the structure of the air cap 8 is prior art, only a simple description is made here, the opening and closing device 7 can be a valve for opening and closing the channel communicating with the nozzle 6, and a common electromagnetic valve is used. The working principle is as follows: when the glue spraying operation is performed, the three-way valve 9 is controlled to be opened to open the glue supply pipe 3 and to close the cleaning pipe 4, and the opening and closing device 7 of the nozzle 6 is opened, when cleaning, the opening and closing device 7 is controlled to be closed, the three-way valve 9 is controlled to be closed to close the glue supply pipe 3 and to open the cleaning pipe 4, the cleaning liquid enters the inner cavity 2 to perform flushing, after the flushing is completed, the valve on the recovery pipe 5 is opened, so that the cleaned liquid flows into a waste liquid tank 12 for temporary storage. In the embodiment, a heating device can also be arranged in the inner cavity 2, for evaporating the residual cleaning liquid, so as to avoid affecting the subsequent glue spraying operation.

[0030] In the above embodiment, reference is made to Figure 2As shown, the opening and closing device 7 comprises a plug body 701 and a cylinder 702, the inside of the spray gun 1 is provided with a mounting groove 101, the cylinder 702 is installed in the mounting groove 101, the plug body 701 is arranged in the inner cavity 2, the connecting part of the mounting groove 101 and the inner cavity 2 forms a limit part 704 for the inward movement of the plug body 701, the recovery pipe 5 is connected in the mounting groove 101, the plug body 701 is connected with the cylinder 702, the plug body 701 cooperates with the side wall of the inner cavity 2 to form a seal and can move along the inner cavity 2 under the pushing of the compressed gas of the cylinder to close the nozzle 6, when the cylinder 702 pushes the plug body 701 to move along the inner cavity 2, the glue liquid in the inner cavity 2 and the nozzle 6 can be squeezed out of the spray gun 1, since the plug body 701 cooperates with the side wall of the inner cavity 2, the plug body 701 can be made of elastic material, the plug body 701 can squeeze out most of the glue liquid from the nozzle 6, so that the residual amount of the glue liquid in the inner cavity 2 and the nozzle 6 is very small, so that the subsequent cleaning effect is better. When the cleaning is completed, the plug body 701 is reset, the reset of the plug body 701 can be realized by controlling the retraction of the cylinder 702 or arranging a spring behind the plug body 701, the reset process of the plug body 701 applies pressure to the cleaning liquid in the inner cavity 2, so that the cleaning liquid flows to the recovery pipe 5 in the mounting groove 101, since the operator is used to cleaning the spray head downward, the recovery pipe 5 can be connected to the low position of the mounting groove 101 close to the plug body 701 after reset. In addition, the front end of the plug body 701 can also be provided with a protruding part 703 matched with the shape of the nozzle 6, when the plug body 701 closes the nozzle 6, the protruding part 703 can completely squeeze out the glue liquid or solidified body in the nozzle 6, avoiding the blockage of the nozzle 6.

[0031] In the above embodiments, reference is made to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the cabinet 22 of the glue sprayer is provided with a glue barrel 10, a liquid storage tank 11 and a waste liquid tank 12 for storing glue liquid, cleaning liquid and waste cleaning liquid respectively, and the glue sprayer is also provided with a circulating tank 15 which can be fixed on the outer side wall of the cabinet 22 or in the cabinet 22. The glue barrel 10 is connected with the glue supply pipe 3, the liquid storage tank 11 is connected with the circulating tank 15, and the glue barrel 10 and the liquid storage tank 11 are further connected with an air pipe 13. The circulating tank 15 is provided with a liquid inlet hole 151 communicating with the liquid storage tank 11, a liquid outlet hole 152 communicating with the cleaning pipe 4, a first stepped hole 153 connected with the recovery pipe 5, and a second stepped hole 154 communicating with the waste liquid tank 12. A first plunger valve 155 is arranged in the first stepped hole 153 of the circulating tank 15, the valve core 157 of the first plunger valve 155 is connected with the stepped surface of the first stepped hole 153 through a spring 27, one end of the valve core 157 towards the inside of the circulating tank 15 protrudes from the first stepped hole 153 and is provided with a ratchet 158. A ratchet wheel 16 is fixed on the inner wall of the circulating tank 15 and cooperates with the ratchet 158. The second stepped hole 154 has the same shape as the first stepped hole 153, and a second plunger valve 156 has basically the same structure as the first plunger valve 155, except that one end of the valve core 157 of the first plunger valve 155 protrudes from the first stepped hole 153 and is provided with a ratchet 158, the second plunger valve 156 is arranged in the second stepped hole 154, the second stepped hole 154 is connected with a liquid discharge pipe 17, and the valve core of the second plunger valve 156 is connected with the stepped surface of the second stepped hole 154 through a spring 27. The valve core 157 of the second plunger valve 156 is connected with one end of a suspended rack 19 through a connecting rope 18, the connecting rope 18 can be a thin steel wire rope or made of non-metallic material. A base 20 is fixed at the bottom of the circulating tank 15, the base 20 is provided with an inverted T-shaped groove 201, the suspended rack 19 is fixed on a floating block, the floating block is arranged in the inverted T-shaped groove 201, the length of the inverted T-shaped groove 201 is greater than the length of the suspended rack 19, so that the suspended rack 19 can move along the length direction of the inverted T-shaped groove 201. When the liquid in the circulating tank 15 exceeds the height of the base 20, the suspended rack 19 floats up and exposes from the inverted T-shaped groove 201. The inverted T-shaped groove 201 has a limiting effect, which can prevent the suspended rack 19 from moving along the width direction of the groove, and limit the suspended rack 19 from being separated from the groove from above. A gear wheel is arranged on the inner wall of the circulating tank 15 and cooperates with the suspended rack 19 in a suspended state, which means that the suspended rack is in a position form contacting with the gear wheel under the floating force of the cleaning liquid. The ratchet wheel 16 and the gear wheel 28 are connected through a transmission device, which will be described in detail with reference to Figure 5 and Figure 6As shown, the transmission device can include a transmission wheel 21 connected with the ratchet wheel 16 and the gear 28 through a shaft, a transmission belt 29 wound around the two transmission wheels 21, the transmission belt 29 is clamped in the clamping portion 211 of the transmission wheel 21, the clamping portion 211 is mainly used to improve the friction between the transmission belt 29 and the transmission wheel 21 to avoid slipping, so the clamping portion 211 is usually in contact with the transmission belt 29 or applies a small extrusion force to avoid the transmission belt 18 being stuck in the clamping portion 211, the transmission wheel 21 can be arranged outside the circulating tank 15, a waterproof seal is arranged between the shaft and the circulating tank 15, and the transmission belt 29 can be a steel wire rope or made of non-metallic material. The transmission structure of the transmission wheel 21 and the transmission belt 29 can also use a chain wheel and chain for transmission, and the transmission of the chain wheel and the chain is prior art, which will not be described here. The working principle is as follows: the control liquid storage tank 11 supplies a predetermined amount of cleaning liquid to the circulating tank 15, the floating rack 19 floats and contacts the gear 28, the first plunger valve 155 and the second plunger valve 156 are closed under the action of the spring 27, during flushing, the compressed gas enters the upper space of the circulating tank 15 through the air pipe 13, the cleaning liquid is pressed from the cleaning pipe 4 into the inner cavity 2 for flushing, at the same time, the cylinder drives the plug body 701 to move along the inner cavity 2, the plug body 701 pushes the glue liquid in the inner cavity 2 out of the nozzle 6 and closes the nozzle 6, the inner cavity 2 is flushed, after flushing, the plug body 701 is retracted under the action of the cylinder 702, the plug body 701 pushes the cleaning liquid into the recovery pipe 5, the pressure applied by the plug body 701 is transmitted to the first plunger valve 155 through the cleaning liquid, the first plunger valve 155 moves downward after being pressed to make the first stepped hole 153 open, the cleaning liquid flows back to the circulating tank 15, at the same time, the ratchet teeth 158 on the valve core 157 of the first plunger valve 155 move downward to drive the ratchet wheel 16 to rotate by a predetermined angle, the ratchet wheel 16 drives the gear to rotate through the transmission mechanism, the gear 28 drives the floating rack 19 to move away from the second plunger valve 156, the floating rack 19 drives the second plunger valve 156 to move upward by a distance, after the plug body 701 is completely reset, the cleaning liquid backflow is completed, the first plunger valve 155 is resealed under the action of the spring to close the first stepped hole 153, during the retraction process, the ratchet teeth 158 will not drive the ratchet wheel 16 to rotate in the opposite direction, the next cleaning will circulate the above process, each cycle makes the floating rack 19 move in the same direction and makes the second plunger valve 156 move upward, when the number of cycles reaches a predetermined number, the second plunger valve 156 is completely opened, the cleaning liquid in the circulating tank 15 is discharged to the waste liquid tank 12, when the cleaning liquid in the circulating tank 15 is exhausted, the floating rack 19 loses buoyancy and sinks to the bottom of the base 20 to disengage from the gear, the second plunger valve 156 is resealed under the action of the spring to close the second stepped hole 154, and the floating rack 19 is below the initial position under the action of the connecting rope 18, the control liquid tank injects a predetermined amount of cleaning liquid into the circulating tank, the floating rack 19 floats and contacts the gear.

[0032] In the above embodiment, with reference toFigure 4 As shown in the figure, in order to avoid the water level of the cleaning liquid from dropping and causing the suspended rack 19 to be out of contact with the gear 28 during the rinsing process, the connecting end of the cleaning pipe, i.e. the liquid outlet hole 152, is higher than the height of the suspended state of the suspended rack 19.

[0033] In the above embodiment, in order to prevent the gear from rotating reversely, a reverse stopping structure can also be installed on the gear, which can be a one-way rotating structure in the prior art.

[0034] Referring to Figure 2 As shown in the figure, the present application also includes a spray gun of a glue spraying machine, which comprises the above cleaning structure.

[0035] Referring to Figure 1 and Figure 3 As shown in the figure, the present application also includes a glue spraying machine, which comprises a cabinet 22, in which a glue barrel 10, a liquid storage tank 11 and a waste liquid tank 12 are stored, and an operation table 23 is arranged above the cabinet 22, which is surrounded by three side partitions 24, and the hooks of the above spray gun 1 can be arranged on the two side partitions 24, the above spray gun 1 is arranged above the operation table 23, and a gas collecting hood is arranged on the upper partition 24 or a plurality of air inlets 25 are arranged on the side partitions 24.

[0036] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiment according to the technical essence of the present application, which does not depart from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A cleaning structure of a glue spraying machine spray gun, the spray gun comprising an inner cavity, a glue supply pipe and a nozzle, the glue supply pipe being in communication with the inner cavity, and the inner cavity being in communication with the nozzle, characterized in that: The cleaning pipe is communicated with the inner cavity of the spray gun at one end and is used for flushing the inner cavity of the spray gun. The recovery pipe is communicated with the inner cavity of the spray gun at one end and is used for collecting the cleaning liquid after flushing. The opening and closing device is used for closing the nozzle before cleaning the inner cavity, in such a way that the cleaning liquid flows into the recovery pipe after cleaning the inner cavity. The cleaning structure further comprises a liquid storage tank for storing the cleaning liquid, a circulating tank connected with one end of the cleaning pipe, one end of the recovery pipe and the liquid storage tank, and a waste liquid tank connected with the circulating tank through a liquid discharge pipe and used for storing the waste cleaning liquid. The liquid storage tank supplies a predetermined amount of cleaning liquid to the circulating tank, the cleaning liquid in the circulating tank is used for flushing the inner cavity through the cleaning pipe and flows back to the circulating tank through the recovery pipe, the cleaning liquid in the circulating tank is used repeatedly for a plurality of times, and when the cleaning is repeated for a predetermined number of times, the circulating tank opens the liquid discharge pipe to discharge the liquid in the circulating tank into the waste liquid tank.

2. The cleaning structure of the glue spraying machine according to claim 1, characterized in that: The first plunger valve is arranged in a first stepped hole of the circulating tank and is connected with the recovery pipe, a valve core of the first plunger valve is connected with a stepped surface of the first stepped hole through a spring, one end of the valve core towards the inside of the circulating tank protrudes from the first stepped hole and is provided with a ratchet tooth, the second plunger valve is arranged in a second stepped hole of the circulating tank and is connected with the liquid discharge pipe, a valve core of the second plunger valve is connected with a stepped surface of the second stepped hole through a spring, a ratchet wheel is fixed on the inner wall of the circulating tank and cooperates with the ratchet tooth on the valve core, a floating rack is fixed on a floating block, the floating block is arranged in the inverted T-shaped groove, one end of the floating block is connected with the valve core of the second plunger valve through a connecting rope, when the liquid in the circulating tank exceeds the height of the base, the floating rack floats and exposes from the inverted T-shaped groove, a gear wheel is fixed on the inner wall of the circulating tank and cooperates with the floating rack in the floating state, and a transmission device is connected with the gear wheel and the ratchet wheel, so that when the ratchet tooth drives the ratchet wheel to rotate, the gear wheel drives the floating rack in the floating state to move.

3. The cleaning structure of the glue spraying machine according to claim 1, characterized in that: The opening and closing device comprises a plug body and a cylinder, the plug body is connected with the cylinder, the plug body cooperates with the side wall of the inner cavity to form a seal and can move along the inner cavity under the pushing of compressed gas and close the nozzle, in such a way that the glue liquid in the inner cavity and the nozzle is squeezed out of the spray gun before the nozzle is closed.

4. The cleaning structure of the glue spraying machine according to claim 1, characterized in that: The spray gun comprises a mounting groove, the mounting groove is provided with a cylinder, the connection between the mounting groove and the inner cavity forms a limiting part for the inward movement of the plug body, and the recovery pipe is connected with the mounting groove.

5. The cleaning structure of the glue spraying machine according to claim 1 or 4, characterized in that: The connecting end of the cleaning pipe and the circulating tank is higher than the height of the floating rack in the floating state.

6. The cleaning structure of the glue spraying machine according to claim 1 or 4, characterized in that: The transmission device comprises a transmission wheel connected with the ratchet wheel and the gear wheel and a transmission belt connecting the upper and lower transmission wheels, the transmission wheel comprises clamping parts on both sides, the transmission belt is clamped in the clamping parts, and the transmission wheel and the transmission belt are arranged outside the circulating tank.

7. A spray gun for a glue applicator, characterized in that: The transmission device comprises a sprocket and a chain.

8. A glue applicator characterized by: The cleaning structure comprises any one of claims 1 to 4. The spray gun comprises claim 7.

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