A spraying device for bumper injection molding

Abstract

The application belongs to the technical field of bumper manufacturing equipment, and particularly relates to a spraying device for bumper injection molding, which comprises a spray head, the spray head is used for spraying release agent, the spray head is connected with a pumping device through a conveying pipeline, further comprises a plugging and air extraction mechanism, the plugging and air extraction mechanism is installed on an injection mold, the plugging and air extraction mechanism is used for plugging and air extraction of the injection mold, further comprises a dispersion mechanism, the dispersion mechanism is installed on a mounting frame, the dispersion mechanism is matched with the spray head and the air extraction pipe, and is used for enhancing the dispersion of the spraying and air extraction effect, through the plugging and air extraction mechanism, when the release agent is sprayed, through the cooperation of the upper mold, the lower mold, the mounting frame and the sealing gasket ring, the injection cavity to be sprayed is sealed in a cage type, and the continuous suction of the air extraction pipe is matched, harmful gas generated after spraying is collected, and the harm of gas leakage to the environment and workers is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bumper manufacturing equipment, in particular to a spraying device for bumper injection molding. BACKGROUND

[0002] In the process of bumper injection molding, a layer of release agent coating is usually sprayed on the surface of the injection mold. This measure aims to facilitate the demolding of the bumper after injection molding.

[0003] In conventional technology, release agents are divided into one-time release agents and semi-permanent release agents according to the number of uses. The difference between them is that the service life of semi-permanent release agents is longer. During use, it needs to be sprayed once every 15-20 cycles, so in the injection molding process, whether it is a one-time release agent or a semi-permanent release agent, the number of release agent sprays is large during a long injection molding process. Because the release agent contains volatile substances, when the release agent is sprayed, the volatile substances are dispersed into the air, not only polluting the environment, but also causing physiological discomfort to workers. At the same time, because the release agent is sprayed in accordance with the principle of a small amount of multiple times to make the sprayed coating uniform, the workload of the release agent spraying operation is large. Under this background, the release agent spraying is usually carried out by automatic equipment, and a suction device is used to recover the volatile substances, thereby reducing the harm to workers.

[0004] For example, a door panel interior injection molding release agent coating device is disclosed in the related art, application number: CN2024102723206. After the release agent is sprayed, the connecting pipe drives the closure cover, the suction pipe, the communication pipe, the connecting frame and the sliding sleeve to rise together. When the sliding sleeve rises to a certain position, the through hole on the sliding sleeve communicates with the trapezoidal slot on the open pipe. The suction force generated by the external air pump continues to suck the harmful gas generated during the spraying of the release agent through the suction pipe, avoiding the diffusion of harmful gas. However, because the solvent and other components in the release agent volatilize quickly during the spraying of the release agent, especially when water-based release agent is sprayed, the mold itself is in a high temperature state, causing the evaporation rate of water solvent to increase. Therefore, the collection of harmful gas is carried out after the spraying is completed, which obviously cannot stop the diffusion of gas. At the same time, the injection mold body has a large exchange channel with the outside world after being opened, so the air pump is used to suck the gas. Not only is the air pumping power of the air pump high, but also it is not convenient to collect water, solvent and other substances that evaporate and volatilize during the spraying process.

[0005] In view of this, the present application provides a spraying device for bumper injection molding to solve the above technical problems. SUMMARY

[0006] In order to make up for the deficiencies of the prior art, solve the above technical problems, the application provides a spraying device for bumper injection molding.

[0007] The application adopts the technical scheme that: the spraying device for bumper injection molding comprises a spray head, the spray head is used for spraying a release agent, and the spray head is connected with a pumping device through a conveying pipeline;

[0008] Further comprising a plugging and air extraction mechanism, the plugging and air extraction mechanism is installed on the injection mold, and the plugging and air extraction mechanism is used for plugging and air extraction of the injection mold;

[0009] The plugging and air extraction mechanism comprises a mounting frame, a sealing gasket ring, a guide plate and an air extraction pipe;

[0010] The mounting frame is a frame structure, the sealing gasket ring is symmetrically arranged on both sides of the mounting frame, and the sealing gasket ring is made of elastic rubber material;

[0011] The air extraction pipe is fixedly installed on the sealing gasket ring, and the air extraction pipe is connected with an air extraction pump;

[0012] Further comprising a dispersion mechanism, the dispersion mechanism is installed on the mounting frame, and the dispersion mechanism is matched with the spray head and the air extraction pipe, and is used for enhancing the dispersion of the spraying and air extraction effects.

[0013] Preferably, the dispersion mechanism comprises a dispersion net and a connecting head;

[0014] The dispersion net is a grid structure, the dispersion net is installed on the mounting frame, a plurality of cavities that are not conductive to each other are formed in the inner cavity of the dispersion net, the spray head is installed on the dispersion net, and the spray head is in conductive connection with the inner cavity of the dispersion net;

[0015] The connecting head is installed on the dispersion net, and the connecting head is used for conductive connection of the dispersion net with the air extraction pipe and the conveying pipeline.

[0016] Preferably, the dispersion net comprises an input layer and an output layer, the input layer is woven by a gas conveying pipe and a liquid conveying pipe, the output layer is woven by a negative pressure pipe with a surface opening, the output layer is located on the upper and lower sides of the input layer, the output layer is connected with the air extraction pipe through the connecting head, the input layer is connected with the conveying pipeline through the connecting head, the spray head is installed on the input layer, and the spray head is in conductive connection with the gas conveying pipe and the liquid conveying pipe.

[0017] Preferably, a plastic net is fixedly installed in the dispersion net, the plastic net is located between the input layer and the output layer, and the plastic net is made of plastic metal material.

[0018] Preferably, the mounting frame comprises an upper pressing frame and a lower pressing frame hinged to each other, the upper pressing frame and the lower pressing frame are provided with through grooves on one side of the hinge, the connecting heads are mounted in the through grooves, and the dispersion net is located between the upper pressing frame and the lower pressing frame.

[0019] Preferably, rubber pressing strips are mounted on the upper pressing frame and the lower pressing frame, and the rubber pressing strips are arranged alternately.

[0020] Preferably, the upper pressing frame and the lower pressing frame are both formed by a plurality of telescopic rods, and the sealing gasket ring is an annular structure formed by a plurality of sealing strips.

[0021] Preferably, the device further comprises a circulating purification mechanism, and the circulating purification mechanism is in conductive connection with the air suction pipe and the air conveying pipe.

[0022] The circulating purification mechanism comprises a coarse filter box and a final filter box.

[0023] The coarse filter box is in conductive connection with the air suction pump output end, the coarse filter box is in conductive connection with the final filter box through a pipeline, a plurality of filter screens are fixedly installed in the coarse filter box, and the final filter box is filled with adsorption filler.

[0024] Preferably, the circulating purification mechanism further comprises a three-way valve, the three-way valve is mounted between the coarse filter box and the final filter box, and the three-way valve is in conductive connection with the air conveying pipe through a conveying pipeline.

[0025] The beneficial effects of the present application are as follows:

[0026] 1. The spraying device for bumper injection molding, by setting the plugging air suction mechanism, when the demolding agent is sprayed, the upper mold, the lower mold, the mounting frame and the sealing gasket ring are cooperated with each other, the injection molding chamber to be sprayed is sealed in a cage type, and the continuous suction effect of the air suction pipe is matched, harmful gas generated after spraying is collected, and the harm of gas leakage to the environment and workers is reduced.

[0027] 2. The spraying device for bumper injection molding, by setting the dispersion assembly, the negative pressure pipe, the air conveying pipe and the liquid conveying pipe are woven into a multi-layer and grid-shaped dispersion net, and the spray heads are uniformly distributed on the dispersion net, in the process of demolding agent spraying and waste gas collection, the uniform distribution of the spray heads and the negative pressure pipe not only makes the gas mist spraying and the negative pressure suction in the injection molding chamber in the upper mold and the lower mold more uniform, effectively avoids the negative influence of uneven airflow flow path on the coating, and further makes the formed demolding agent coating more uniform, and due to the setting of multi-point spraying and multi-point gas suction, the probability of spraying and gas suction dead angle is reduced, and the spraying and gas suction efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] Figure 1 This is a perspective view of the present invention assembled on an injection mold;

[0030] Figure 2 This is a perspective view of the present invention;

[0031] Figure 3 It is a 3D view of the mounting frame;

[0032] Figure 4 It is a 3D view of the sealing gasket ring;

[0033] Figure 5 It is a 3D diagram of the connector;

[0034] Figure 6 This is a partial sectional view of the mounting frame in this invention;

[0035] Figure 7 This is a cross-sectional view of a distributed network;

[0036] In the diagram: 1. Nozzle; 11. Pumping equipment; 12. Delivery pipeline; 2. Mounting frame; 21. Sealing gasket; 22. Suction pipe; 23. Suction pump; 24. Connector; 25. Upper pressure frame; 26. Lower pressure frame; 27. Through groove; 3. Dispersion net; 31. Gas delivery pipe; 32. Liquid delivery pipe; 33. Negative pressure pipe; 4. Plastic mesh; 41. Rubber strip; 5. Coarse filter box; 51. Final filter box; 52. Three-way valve. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] like Figures 1 to 7 As shown, the present invention provides a spraying device for injection molding of bumpers, including a spray head 1, which is used to spray a release agent, and the spray head 1 is externally connected to a pumping device 11 through a delivery pipe 12.

[0039] It also includes a sealing and evacuation mechanism, which is installed on the injection mold and is used to seal and evacuate the injection mold.

[0040] The sealing and extraction mechanism includes: a mounting frame 2, a sealing gasket ring 21, a guide plate, and an extraction pipe 22;

[0041] The mounting frame 2 is a frame structure, and the sealing gaskets 21 are symmetrically arranged on both sides of the mounting frame 2. The sealing gaskets 21 are all made of elastic rubber material.

[0042] The sealing gasket ring 21 is fixedly installed with an air extraction pipe 22, and the air extraction pipe 22 is connected with an air extraction pump 23;

[0043] The dispersion mechanism is installed on the mounting frame 2 and cooperates with the spray head 1 and the air extraction pipe 22 to enhance the dispersion of spraying and air extraction.

[0044] In the bumper injection molding process, the spraying of the release agent on the injection mold plays a crucial role in the release effect of the bumper injection molding part. In the spraying process of the release agent, in order to reduce the harm of solvent volatilization, high temperature invasion and other conditions to the workers, mechanical spraying is used instead of manual spraying. In order to further protect the workers, the sealing and air extraction mechanism is provided to cooperate with the spray head 1 to spray the release agent and realize safe spraying of the release agent.

[0045] Specifically, before spraying the release agent, the worker needs to dilute and mix the release agent according to the specific type of the release agent, and heat the injection mold to cooperate with the spraying of the release agent. For example, for water-based release agent, before spraying the release agent, the injection mold is cleaned to remove residual release agent, oil stains, dust and other impurities on the surface of the mold. Then the water-based release agent is used after being diluted with water in a certain proportion, and the dilution ratio is generally 1:3-10 times, and the specific ratio can be adjusted according to the actual spraying process requirements. After dilution, the release agent needs to be shaken evenly, and then the diluted release agent is pumped to the spray head 1 through a pipeline under pressure to be sprayed in the form of aerosol on the surface of the injection mold. Before spraying, the mounting frame 2 is placed on the opened injection mold, and the sealing gasket ring 21 is fixedly installed on the upper and lower sides of the mounting frame 2. When the worker controls the upper mold and the lower mold to be relatively closed according to the spraying process, the mounting frame 2 between the upper mold and the lower mold is in elastic sealing contact with the upper mold and the lower mold through the sealing gasket ring 21. At this time, under the pressure of the external pumping device 11, the spray head 1 sprays the release agent in the form of aerosol in the injection chamber. During spraying, the injection chamber is sprayed several times in a small amount and several times, so that a uniform coating is formed on the surface of the injection chamber. When the spray head 1 sprays aerosol, the mounting frame 2 and the sealing gasket ring 21 can seal the gap between the upper mold and the lower mold, effectively preventing the evaporation and volatilization of water mist and solvent from spreading to the outside. At the same time, the air extraction pipe 22 continuously extracts the gas in the injection chamber under the action of the air extraction pump 23, so as to collect the evaporated and volatilized water mist and solvent, and avoid the harm of gas leakage to the outside.

[0046] The application realizes the cage type sealing of the injection molding chamber to be sprayed by the cooperation of the upper mold, the lower mold and the mounting frame 2, the sealing gasket ring 21 when spraying the release agent, and realizes the collection of harmful gas generated after spraying by the continuous suction effect of the suction pipe 22, thereby reducing the harm of gas leakage to the environment and the staff.

[0047] The dispersion mechanism comprises a dispersion net 3 and a connecting head 24;

[0048] The dispersion net 3 is a grid structure, the dispersion net 3 is installed on the mounting frame 2, a plurality of cavities not communicated with each other are arranged in the inner cavity of the dispersion net 3, the spray head 1 is installed on the dispersion net 3, and the spray head 1 is in communication connection with the inner cavity of the dispersion net 3.

[0049] The connecting head 24 is installed on the dispersion net 3, and the connecting head 24 is used for connecting the dispersion net 3 with the suction pipe 22 and the conveying pipeline 12.

[0050] The dispersion net 3 comprises an input layer and an output layer, the input layer is woven by a gas conveying pipe 31 and a liquid conveying pipe 32, the output layer is woven by a surface perforated negative pressure pipe 33, the output layer is arranged on the upper and lower sides of the input layer, the output layer is connected with the suction pipe 22 through the connecting head 24, the input layer is connected with the conveying pipeline 12 through the connecting head 24, the conveying pipeline 12 and the pumping equipment 11 are both divided into two groups and are in communication connection with the gas conveying pipe 31 and the liquid conveying pipe 32 respectively, the spray head 1 is installed on the input layer, and the spray head 1 is in communication connection with the gas conveying pipe 31 and the liquid conveying pipe 32.

[0051] Due to the uniformity of the spraying of the release agent gas mist and the airflow negative pressure extraction, the forming of the release agent coating layer is affected, therefore, the dispersion mechanism is arranged in the application, when the upper mold and the lower mold are closed and cooperate with the plugging air extraction mechanism, the staff opens the pumping equipment 11 to pump the prepared release agent and clean air into the dispersion net 3 after the plugging of the injection cavity is realized, since the dispersion layer is a three-layer structure in the application, the gas conveying pipe 31 and the liquid conveying pipe 32 in the middle layer of the dispersion layer are in conductive connection with the nozzle 1, and the external pumping equipment 11 is in conductive connection with the gas conveying pipe 31 and the liquid conveying pipe 32 through the connecting head 24, therefore, the continuously pumped compressed air and release agent enter the nozzle 1 and are sprayed in the form of gas mist into the injection cavity under the action of the nozzle 1, then the air extraction pump 23 is started to cause the negative pressure to act on the air extraction pipe 22 and the negative pressure pipe 33, since the negative pressure pipe 33 is provided with uniformly distributed micropores on the surface, the water mist and gas evaporated and volatilized during the forming of the release agent coating layer are discharged outward through the negative pressure pipe 33, the output layer installed on the two sides of the input layer continuously recovers the gas mist formed in the injection cavity, with the continuous spraying and air backflow, the dynamic balance of the air pressure in the injection cavity is realized, and then the continuous collection of the waste gas is realized during the forming of the release agent coating layer.

[0052] It should be known that, in order to further reduce the mutual influence of the spraying and the gas collection, in actual application, the spraying operation and the gas collection operation can be alternately and intermittently performed, or the power can be adjusted to reduce the negative pressure air extraction power when the release agent is sprayed, and to increase the negative pressure air extraction power after the release agent spraying is completed, so that the spraying operation and the gas collection operation are realized.

[0053] The application realizes the more uniform spraying and negative pressure suction in the injection cavity in the upper mold and the lower mold by the uniform distribution of the nozzle 1 and the negative pressure pipe 33 during the spraying of the release agent and the collection of the waste gas, effectively avoids the negative influence of the uneven airflow flow path on the coating layer, and further makes the formed release agent coating layer more uniform, and since the multi-point spraying and multi-point air extraction are arranged, the probability of the existence of the spraying and air extraction dead angle is reduced, and the spraying and air extraction efficiency is improved.

[0054] As a preferred embodiment of the application, the dispersion net 3 is fixedly installed with a plastic net 4, the plastic net 4 is located between the input layer and the output layer, and the plastic net 4 is made of a plastic metal material.

[0055] Due to the limitation of the bumper three-dimensional shape, the injection chamber is a three-dimensional shape, in order to further make the spraying and air extraction uniform, a plastic net 4 is arranged in the dispersion net 3 in the application, the plastic net 4 is made of plastic metal material, preferably aluminum alloy, copper alloy material, before the spraying operation, the staff controls the upper die and the lower die of the injection mold to be closed, and the upper die and the lower die are used to press the dispersion net 3, since the negative pressure pipe 33, the gas conveying pipe 31 and the liquid conveying pipe 32 constituting the dispersion net 3 are all elastic hoses, under the action of the pressing force, the plastic net 4 is quickly deformed, so that the plastic net 4 tends to the shape of the injection chamber, and since the plastic net 4 is located between the input layer and the output layer, the elastic contact between the plastic net 4 and the injection chamber is avoided during the deformation of the plastic net 4, so as to avoid damaging the injection chamber, when the shape of the plastic net 4 is determined, the upper die and the lower die are controlled to be separated, and the blocking air extraction mechanism is installed between the upper die and the lower die, the dispersion net 3 is connected with the conveying pipeline 12 and the like through the connecting head 24, during the spraying process, due to the change of the shape of the plastic net 4, the dispersion net 3 is supported by the plastic net 4, so that the uniformity of the shape of the dispersion net 3 and the injection chamber is enhanced, not only the uniformity of the release agent spraying can be effectively enhanced, the difficulty of the spraying operation can be effectively reduced, but also the spacing between the upper die and the lower die can be reduced during the spraying operation, so that the release agent spraying space can be blocked by the blocking air extraction mechanism.

[0056] It should be known that during actual assembly, when the size of the nozzle 1 is selected, the thickness of the output layer and the plastic net 4 is referred to, and the height of the nozzle 1 protruding from the input layer under the action of the pressure should be less than the thickness of the output layer and the plastic net 4, so as to avoid collision between the nozzle 1 and the injection chamber during the plastic forming process, and reduce the probability of damage to the nozzle 1 and the injection chamber.

[0057] As a preferred embodiment of the application, the mounting frame 2 comprises an upper pressing frame 25 and a lower pressing frame 26 which are hingedly connected, a through groove 27 is formed in one side of the upper pressing frame 25 and the lower pressing frame 26 which are hingedly connected, the connecting head 24 is installed in the through groove 27, and the dispersion net 3 is located between the upper pressing frame 25 and the lower pressing frame 26, during the spraying process, the upper pressing frame 25 and the lower pressing frame 26 press and block the dispersion net 3.

[0058] The upper pressing frame 25 and the lower pressing frame 26 are both installed with rubber pressing strips 41, and the rubber pressing strips 41 are alternately arranged.

[0059] The upper pressing frame 25 and the lower pressing frame 26 are both spliced by a plurality of telescopic rods, and the sealing gasket ring 21 is an annular structure body composed of a plurality of sealing strips.

[0060] In order to increase the application range of the device, the mounting frame 2 is composed of the upper pressing frame 25 and the lower pressing frame 26 in the application, and the upper pressing frame 25 and the lower pressing frame 26 are both spliced by a plurality of telescopic rods, so that the mounting frame 2 can be flexibly adjusted within the designed range. After the upper and lower molds are pressed to form the plastic net 4, the plastic net 4 is deformed, but the edge of the plastic net 4 is not in the spraying range. Therefore, the staff adjusts the range of the mounting frame 2 at this time, so that the mounting frame 2 can cover the injection cavity to be sprayed and can minimize the frame selection range of the mounting frame 2. Then, during the process of the upper and lower molds approaching each other again, the sealing gasket ring 21 on the mounting frame 2 is pressed by the upper and lower molds, so that the upper pressing frame 25 and the lower pressing frame 26 gradually close. In this process, the rubber pressing strips 41 on the upper pressing frame 25 and the rubber pressing strips 41 on the lower pressing frame 26 gradually close, thereby clamping the dispersion net 3 therebetween. Under the action of the clamping pressure, the dispersion net 3 is deformed, and the dispersion net 3 inside and outside the mounting frame 2 is blocked. When the compressed air and the release agent are pumped into the dispersion net 3, the flow path of the compressed air and the release agent is blocked, so that the compressed air and the release agent are only dispersed in the dispersion net 3 within the mounting frame 2. At the same time, under the action of negative pressure extraction, the negative pressure can only act on the dispersion net 3 within the mounting frame 2, thereby flexibly adjusting the use range of the dispersion net 3. When different volume and model injection molds are used, the application range of the spraying device is increased.

[0061] As a preferred embodiment of the application, the circulating purification mechanism is further provided, which is in communication with the air suction pipe 22 and the air conveying pipe 31.

[0062] The circulating purification mechanism comprises a coarse filter box 5 and a final filter box 51.

[0063] The coarse filter box 5 is in communication with the output end of the air suction pump 23, and the coarse filter box 5 and the final filter box 51 are in communication through a pipeline. A plurality of filter screens are fixedly installed in the coarse filter box 5, and the final filter box 51 is filled with adsorption filler.

[0064] The circulating purification mechanism further comprises a three-way valve 52, which is installed between the coarse filter box 5 and the final filter box 51, and is in communication with the air conveying pipe 31 through the conveying pipeline 12.

[0065] In the process of waste gas extraction collection, the air extraction pump 23 continuously extracts air and pumps the air flow into the rough filter box 5, and the liquid components in the air flow are intercepted and gathered in the rough filter box 5 through the interception of the filter screen in the rough filter box 5, while the gaseous components enter the three-way valve 52 with a small amount of liquid components, if the demolding agent spraying process is in progress at this time, the three-way valve 52 opens the communication channel with the air conveying pipe 31, so that the air flow enters the air conveying pipe 31, as much as possible to reduce the content of external air participating in spraying, thereby reducing the total amount of waste gas finally discharged, and when the spraying has been completed at this time, the three-way valve 52 opens the communication channel with the final filter box 51, so that the air flow flows from the three-way valve 52 into the final filter box 51, and is discharged to the outside after being adsorbed and purified by the adsorption filler in the final filter box 51, the switching of the channel of the three-way valve 52 can be controlled by the control program or manually operated, in actual application, the waste gas is used after rough filtration, since the waste gas itself is a demolding agent separation product, therefore, the use of waste gas instead of air to dilute the demolding agent will not affect the spraying of the demolding agent, and the recycling of the waste gas reduces the use amount of external air and the total amount of waste gas emission, which can reduce the burden of the final filter box 51 and the replacement frequency of the adsorption filler in the final filter box 51, and also reduces the total amount of exhaust gas and the influence on the external environment.

[0066] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A bumper injection spraying device, comprising a spray head (1) for spraying release agent, the spray head (1) being connected with a pumping device (11) through a conveying pipeline (12); characterized in that It also includes a plugging and air extraction mechanism, which is installed on the injection mold and is used for plugging and air extraction of the injection mold; The plugging and air extraction mechanism comprises a mounting frame (2), a sealing gasket ring (21), a guide plate and an air extraction pipe (22); The mounting frame (2) is a frame structure, the sealing gasket ring (21) is symmetrically arranged on both sides of the mounting frame (2), and the sealing gasket ring (21) is made of elastic rubber material; The air extraction pipe (22) is fixedly installed on the sealing gasket ring (21), and the air extraction pipe (22) is connected with an air extraction pump (23); It also includes a dispersion mechanism, which is installed on the mounting frame (2) and cooperates with the spray head (1) and the air extraction pipe (22) to enhance the dispersion of the spraying and air extraction effects; The dispersion mechanism comprises a dispersion net (3) and a connecting head (24); The dispersion net (3) is a grid structure, the dispersion net (3) is installed on the mounting frame (2), a plurality of cavities not conductive to each other are formed in the inner cavity of the dispersion net (3), the spray head (1) is installed on the dispersion net (3), and the spray head (1) is in conductive connection with the inner cavity of the dispersion net (3); The connecting head (24) is installed on the dispersion net (3), and the connecting head (24) is used for connecting the dispersion net (3) with the air extraction pipe (22) and the conveying pipeline (12) in a conductive manner; The dispersion net (3) comprises an input layer and an output layer, the input layer is woven by a gas conveying pipe (31) and a liquid conveying pipe (32), the output layer is woven by a surface-perforated negative pressure pipe (33), the output layer is located on the upper and lower sides of the input layer, the output layer is connected with the air extraction pipe (22) through the connecting head (24), the input layer is connected with the conveying pipeline (12) through the connecting head (24), the spray head (1) is installed on the input layer, and the spray head (1) is in conductive connection with the gas conveying pipe (31) and the liquid conveying pipe (32); The dispersion net (3) is internally fixedly installed with a plastic net (4), the plastic net (4) is located between the input layer and the output layer, and the plastic net (4) is made of plastic metal material.

2. The spraying device for bumper injection molding according to claim 1, characterized in that: The mounting frame (2) comprises an upper pressing frame (25) and a lower pressing frame (26) hingedly connected with each other, the upper pressing frame (25) and the lower pressing frame (26) are provided with a through groove (27) on the hinged side, the connecting head (24) is installed in the through groove (27), the dispersion net (3) is located between the upper pressing frame (25) and the lower pressing frame (26), and the upper pressing frame (25) and the lower pressing frame (26) extrude and block the dispersion net (3) during the spraying process.

3. The spraying device for bumper injection molding according to claim 2, characterized in that: The upper pressing frame (25) and the lower pressing frame (26) are both provided with rubber pressing strips (41), and the rubber pressing strips (41) are alternately arranged.

4. The spraying device for bumper injection molding according to claim 3, characterized in that: The upper pressing frame (25) and the lower pressing frame (26) are both spliced by multiple telescopic rods, and the sealing gasket ring (21) is an annular structure composed of multiple sealing strips.

5. The spraying device for bumper injection molding according to claim 1 or 4, characterized in that: The circulating purification mechanism is in communication connection with the air extraction pipe (22) and the gas delivery pipe (31). The circulating purification mechanism comprises a rough filter box (5) and a final filter box (51). The rough filter box (5) is in communication connection with the output end of the air extraction pump (23), the rough filter box (5) is in communication connection with the final filter box (51) through a pipeline, multiple layers of filter screens are fixedly installed in the rough filter box (5), and the final filter box (51) is filled with adsorption fillers.

6. A spraying device for bumper injection molding according to claim 5, characterized in that: The circulating purification mechanism further comprises a three-way valve (52), the three-way valve (52) is installed between the rough filter box (5) and the final filter box (51), and the three-way valve (52) is in communication connection with the gas delivery pipe (31) through a delivery pipeline (12).

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