Spraying device for bumper injection molding

Abstract

The invention 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 a release agent, and the spray head is externally connected with pumping equipment through a conveying pipeline; the device further comprises a plugging and air exhausting mechanism, and the plugging and air exhausting mechanism is installed on the injection mold and used for plugging and air exhausting of the injection mold. The mold further comprises a dispersing mechanism, the dispersing mechanism is mounted on the mounting frame, the dispersing mechanism is matched with the spray head and the exhaust pipe, and the dispersing mechanism is used for enhancing the dispersity of the spraying and exhaust effects. When a release agent is sprayed, the upper mold, the lower mold, the mounting frame and the sealing gasket ring are matched with one another, so that the spraying effect is improved; the injection molding chamber to be sprayed is sealed in a covering manner, and the collection of harmful gas generated after spraying is realized by matching with the continuous suction effect of the suction pipe, so that the harm of gas leakage to the environment and workers is reduced.

Description

Technical Field

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

[0002] During the injection molding process of the bumper, a layer of release agent coating is usually sprayed on the surface of the injection mold. This measure is intended to make it easier to demold the bumper after injection molding.

[0003] In conventional technology, mold release agents are divided into disposable mold release agents and semi-permanent mold release agents according to the number of times they are used. The difference is that the semi-permanent mold release agent has a longer service life. When in use, it only needs to be re-sprayed once every 15-20 cycles. Therefore, in the injection molding process, no matter whether a disposable mold release agent or a semi-permanent mold release agent is used, the mold release agent is sprayed more times during the long injection molding process. Since the mold release agent contains volatile substances, when the mold release agent is sprayed, the volatile substances are dispersed into the air, which not only pollutes the environment, but also causes physiological discomfort to the staff. At the same time, because the mold release agent is sprayed, the principle of small amounts and multiple times is adhered to so that the coating formed by the spraying is uniform, so the workload of the mold release agent spraying operation is large. Under this background, the mold release agent spraying is mostly carried out by automated equipment, and is equipped with suction equipment to recover the volatile substances, thereby reducing the harm to the staff.

[0004] For example, a release agent coating device before injection molding of door panel interior is disclosed in the related art, application number: CN2024102723206. In this scheme, after the release agent is sprayed, the connecting pipe drives the closing cover, the suction pipe, the connecting pipe, the connecting frame and the sliding sleeve to rise together. When the sliding sleeve is lifted to a certain position, the through hole on the sliding sleeve is connected to the trapezoidal groove on the perforated pipe, and the suction force generated by the external vacuum pump continues to absorb the harmful gas generated when the release agent is sprayed through the suction pipe to avoid the diffusion of harmful gas. However, when spraying the release agent, the solvent and other components in the release agent evaporate quickly, especially when spraying the water-based release agent, the mold itself is in a high temperature state, which accelerates the evaporation rate of the water solvent. Therefore, the harmful gas is collected only after the spraying is completed, which obviously cannot prevent the diffusion of the gas. At the same time, after the injection mold body is opened, the interaction channel with the outside world is large. Therefore, the spliced ​​vacuum pump sucks the gas, which not only requires a high suction power of the vacuum pump, but also makes it inconvenient to collect the water and solvent evaporated and volatilized during the spraying process.

[0005] In view of this, the present invention proposes a spraying device for bumper injection molding to solve the above technical problems. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the present invention proposes a spraying device for bumper injection molding.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a spraying device for bumper injection molding described in the present invention comprises a spray head, the spray head is used for spraying a mold release agent, and the spray head is externally connected to a pumping device through a delivery pipeline;

[0008] It also includes a plugging and exhausting mechanism, which is installed on the injection mold and is used to seal and exhaust the injection mold;

[0009] The sealing and exhaust mechanism comprises: a mounting frame, a sealing gasket ring, a guide plate and an exhaust pipe;

[0010] The installation frame is a frame-type structure, the sealing gasket rings are symmetrically arranged on both sides of the installation frame, and the sealing gasket rings are made of elastic rubber material;

[0011] An air extraction pipe is embedded and fixedly installed on the sealing gasket ring, and the air extraction pipe is externally connected to an air extraction pump;

[0012] It also includes a dispersion mechanism, which is installed on the installation frame. The dispersion mechanism cooperates with the spray head and the air extraction pipe to enhance the dispersion of spraying and air extraction.

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

[0014] The dispersion net is a grid-like structure, the dispersion net is installed on a mounting frame, a plurality of mutually non-conductive cavities are provided in the inner cavity of the dispersion net, the nozzle is installed on the dispersion net, and the nozzle is conductively connected to the inner cavity of the dispersion net;

[0015] The connector is installed on the dispersion net, and the connector is used to connect the dispersion net with the exhaust pipe and the delivery pipeline.

[0016] Preferably, the dispersion network includes an input layer and an output layer, the input layer is woven from an air pipe and a liquid pipe, the output layer is woven from a negative pressure pipe with holes on the surface, the output layer is located on the upper and lower sides of the input layer, the output layer is connected to the exhaust pipe through a connector, the input layer is connected to the delivery pipeline through a connector, the nozzle is installed on the input layer, and the nozzle is conductively connected to the air pipe and the liquid pipe.

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

[0018] Preferably, the installation frame includes an upper pressing frame and a lower pressing frame hinged to each other, a through groove is opened on one side of the hinge between the upper pressing frame and the lower pressing frame, the connecting heads are all installed in the through groove, and the dispersion net is located between the upper pressing frame and the lower pressing frame. During the spraying process, the upper pressing frame and the lower pressing frame squeeze and block the dispersion net.

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

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

[0021] Preferably, it also includes a circulation purification mechanism, which is conductively connected with the air extraction pipe and the air delivery pipe;

[0022] The circulation purification mechanism includes a coarse filter box and a final filter box;

[0023] The coarse filter box is conductively connected to the output end of the vacuum pump, and the coarse filter box is conductively connected to the final filter box through a pipeline. Multiple layers of filter screens are fixedly installed in the coarse filter box, and the final filter box is filled with adsorption fillers.

[0024] Preferably, the circulation purification mechanism further includes a three-way valve, which is installed between the coarse filter box and the final filter box, and the three-way valve is conductively connected to the gas pipe through a delivery pipeline.

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

[0026] 1. The spray device for bumper injection molding described in the present invention is provided with a sealing and exhausting mechanism. When spraying the release agent, the upper mold, the lower mold, the mounting frame and the sealing gasket ring cooperate with each other to achieve a shrouding and sealing of the injection molding chamber to be sprayed, and the continuous suction effect of the exhaust pipe is combined to achieve the collection of harmful gases generated after spraying, thereby reducing the harm of gas leakage to the environment and workers.

[0027] 2. The spray device for bumper injection molding described in the present invention, by setting a dispersion component, adopts negative pressure pipes, air pipes and liquid infusion pipes to weave a multi-layer, grid-like dispersion network, and the nozzles are evenly distributed on the dispersion network. In the process of release agent spraying and exhaust gas collection, the uniform distribution of nozzles and negative pressure pipes is utilized, which not only makes the aerosol spraying and negative pressure suction in the injection molding chambers in the upper mold and the lower mold act more evenly, effectively avoids the negative impact of uneven air flow path on the coating, and thus makes the formed release agent coating more uniform. At the same time, due to the setting of multi-point spraying and multi-point exhaust, the probability of spraying and exhaust dead corners is reduced, thereby improving the spraying and exhaust efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Figure 1 It is a stereogram of the assembly of the present invention on an injection mold;

[0030] Figure 2 is a stereogram of the present invention;

[0031] Figure 3 It is a three-dimensional diagram of the mounting frame;

[0032] Figure 4 is a stereogram of a sealing gasket ring;

[0033] Figure 5 It is a stereogram of the connector;

[0034] Figure 6 is a partial cross-sectional view of the mounting frame of the present invention;

[0035] Figure 7 is a cross-sectional view of the dispersion network;

[0036] In the figure: 1. Nozzle; 11. Pumping equipment; 12. Delivery pipeline; 2. Installation frame; 21. Sealing gasket; 22. Exhaust pipe; 23. Exhaust pump; 24. Connector; 25. Upper pressing frame; 26. Lower pressing frame; 27. Through-groove; 3. Dispersion net; 31. Air pipe; 32. Liquid pipe; 33. Negative pressure pipe; 4. Molding net; 41. Rubber strip; 5. Coarse filter box; 51. Final filter box; 52. Three-way valve. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0038] like Figures 1 to 7 As shown, a spraying device for bumper injection molding according to the present invention comprises a spray head 1, the spray head 1 is used for spraying a mold release agent, and the spray head 1 is externally connected to a pumping device 11 through a delivery pipeline 12;

[0039] It also includes a plugging and exhausting mechanism, which is installed on the injection mold and is used to seal and exhaust the injection mold;

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

[0041] The installation frame 2 is a frame-type structure, and the sealing rings 21 are symmetrically arranged on both sides of the installation frame 2. The sealing rings 21 are made of elastic rubber material;

[0042] An air extraction pipe 22 is embedded and fixedly mounted on the sealing gasket ring 21, and the air extraction pipe 22 is externally connected to an air extraction pump 23;

[0043] It also includes a dispersion mechanism, which is installed on the installation frame 2. The dispersion mechanism cooperates with the spray head 1 and the exhaust pipe 22 to enhance the dispersion of spraying and exhausting effects.

[0044] In the bumper injection molding process, the spraying of the release agent on the injection mold plays a vital role in the demoulding effect of the bumper injection molded part. During the spraying of the release agent, in order to reduce the harm to the workers caused by solvent volatilization, high temperature invasion and the like, mechanical instead of manual spraying of the release agent is often used. At the same time, in order to further protect the workers, the present invention provides a sealing and exhaust mechanism, which cooperates with the nozzle 1 to spray the demoulding machine to achieve safe spraying of the demoulding machine.

[0045] Specifically, before spraying the release agent, the staff needs to dilute and mix the release agent according to the type of release agent used, and heat the injection mold to cooperate with the spraying of the release agent. Taking the water-based release agent as an example, before spraying the release agent, the injection mold is first cleaned to remove residual release agent, oil stains, dust and other impurities on the surface of the mold, and then the water-based release agent is diluted with water in a certain proportion. The dilution ratio is generally 1:3-10 times. The specific ratio can be adjusted according to the actual spraying process requirements. After diluting with water, it is necessary to shake it well, and then the diluted release agent is pressurized and pumped to the nozzle 1 through a pipeline, and sprayed on the surface of the injection mold in the form of aerosol. Before the nozzle 1 is sprayed, the mounting frame 2 in the present invention is placed on the opened injection mold, and sealing gasket rings 21 are fixedly installed on the upper and lower sides of the mounting frame 2. When the worker When the worker controls the upper mold and the lower mold of the injection mold to close relative to each other according to the spraying process, the installation frame 2 located 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 pressurized action of the external pumping equipment 11, the nozzle 1 sprays the release agent in the injection molding chamber in the form of aerosol. When spraying, the injection molding chamber is sprayed multiple times in a small amount and multiple times, so that a uniform coating is formed on the surface of the injection molding chamber. At the same time, when the nozzle 1 sprays the aerosol, the existence of the installation frame 2 and the sealing gasket ring 21 can block the gap between the upper mold and the lower mold, thereby effectively preventing the evaporation and volatilization of water mist, solvents, etc. from diffusing to the outside. At the same time, the exhaust pipe 22, under the action of the exhaust pump 23, continuously extracts the gas in the injection molding chamber to realize the collection of the evaporated and volatilized water mist and solvents, so as to avoid the harm of gas leakage to the outside.

[0046] The present invention sets a sealing and exhaust mechanism. When spraying the release agent, the upper mold, the lower mold, the mounting frame 2, and the sealing gasket ring 21 cooperate with each other to achieve a shrouding seal on the injection molding chamber to be sprayed, and the continuous suction effect of the exhaust pipe 22 is combined to collect the harmful gases generated after spraying, thereby reducing the harm of gas leakage to the environment and workers.

[0047] The dispersion mechanism includes a dispersion net 3 and a connector 24;

[0048] The dispersion net 3 is a grid-like structure, and the dispersion net 3 is installed on the installation frame 2. The inner cavity of the dispersion net 3 is provided with a plurality of cavities that are not connected to each other. The nozzle 1 is installed on the dispersion net 3, and the nozzle 1 is connected to the inner cavity of the dispersion net 3.

[0049] The connector 24 is installed on the dispersion net 3 , and is used to connect the dispersion net 3 with the exhaust pipe 22 and the delivery pipe 12 .

[0050] The dispersion network 3 includes an input layer and an output layer, the input layer is woven from an air pipe 31 and a liquid pipe 32, the output layer is woven from a negative pressure pipe 33 with holes on the surface, the output layer is located on the upper and lower sides of the input layer, the output layer is connected to the air extraction pipe 22 through a connector 24, and the input layer is connected to the delivery pipeline 12 through a connector 24. In the present invention, the delivery pipeline 12 and the pumping equipment 11 are divided into two groups, and are respectively conductively connected to the air pipe 31 and the liquid pipe 32. The nozzle 1 is installed on the input layer, and the nozzle 1 is conductively connected to the air pipe 31 and the liquid pipe 32.

[0051] Since the uniformity of the spraying of the release agent aerosol and the extraction of the negative pressure of the airflow will affect the molding of the release agent coating, a dispersion mechanism is provided in the present application. When the upper mold and the lower mold are closed and cooperated with the sealing and exhaust mechanism to achieve the sealing of the injection molding chamber, the staff turns on the pumping equipment 11 to pump the prepared release agent and clean air into the dispersion network 3. Since the dispersion layer in the present invention is a three-layer structure, the air pipe 31 and the liquid pipe 32 located in the middle layer of the dispersion layer are both connected to the nozzle 1, and the external pumping equipment 11 is connected to the air pipe 31 and the liquid pipe 32 through the connector 24, so the continuous pumping Compressed air and release agent enter into the nozzle 1, and under the action of the nozzle 1, they are sprayed into the injection cavity in the form of aerosol. Then, the vacuum pump 23 is started, causing negative pressure to act on the vacuum pipe 22 and the negative pressure pipe 33. Since the surface of the negative pressure pipe 33 is provided with evenly distributed micropores, the water mist, gas, etc. evaporated and volatilized during the process of forming the release agent coating are discharged outward through the negative pressure pipe 33. The output layers installed on both sides of the input layer continuously recover the aerosol formed in the injection cavity. With the continuous spraying and gas reflux, the dynamic balance of the air pressure in the injection cavity is achieved, and then in the process of forming the release agent coating, the continuous collection of waste gas is achieved.

[0052] It should be noted that in order to further reduce the mutual influence between spraying and gas collection, in actual application, the spraying operation and the gas collection operation can be performed alternately or by adjusting the power. When the release agent is sprayed, the negative pressure exhaust power can be reduced. After the release agent spraying is completed, the negative pressure exhaust power can be increased to realize the spraying operation and the gas collection operation.

[0053] The present invention sets a dispersion component, and adopts a negative pressure pipe 33, an air pipe 31 and an infusion pipe 32 to weave a multi-layer, grid-shaped dispersion network 3, and makes the nozzle 1 evenly distributed on the dispersion network 3. In the process of release agent spraying and exhaust gas collection, the uniform distribution of the nozzle 1 and the negative pressure pipe 33 is utilized, which not only makes the aerosol spraying and negative pressure suction in the injection molding chambers in the upper mold and the lower mold more uniform, but also effectively avoids the negative impact of the uneven air flow path on the coating, thereby making the formed release agent coating more uniform. At the same time, due to the setting of multi-point spraying and multi-point exhaust, the probability of the existence of spraying and exhaust dead corners is reduced, thereby improving the spraying and exhaust efficiency.

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

[0055] Due to the limitation of the three-dimensional shape of the bumper, the injection molding chamber is a three-dimensional shape. In order to further make the spraying and exhaust uniform, a molding net 4 is arranged in the dispersion net 3 in the present invention. The molding net 4 is made of plastic metal material, preferably aluminum alloy or copper alloy. Before the spraying operation, the staff controls the upper mold and the lower mold of the injection mold to close, and uses the upper mold and the lower mold to press the dispersion net 3. Since the negative pressure pipe 33, the air pipe 31 and the liquid infusion pipe 32 constituting the dispersion net 3 are all elastic hoses, the molding net 4 is quickly deformed under the action of the pressure, so that the molding net 4 tends to the shape of the injection molding chamber. Since the molding net 4 is located between the input layer and the output layer, the molding net 4 is also During the deformation process, the molding net 4 is in elastic contact with the injection molding chamber to avoid damage to the injection molding chamber. When the shape of the molding net 4 is determined, the upper mold and the lower mold are controlled to separate, and the sealing and exhaust mechanism is installed between the upper and lower molds. The dispersion net 3 is connected to the conveying pipeline 12, etc. using a connector 24. During the spraying process, due to the change in the shape of the molding net 4, the molding net 4 is used to support the dispersion net 3, so that the shape of the dispersion net 3 and the injection molding chamber The uniformity of the distance is enhanced, which can not only effectively enhance the uniformity of the release agent spraying and effectively reduce the difficulty of the spraying operation, but also during the spraying operation, the distance between the upper mold and the lower mold is reduced, which is convenient for the sealing and exhaust mechanism to seal the release agent spraying space.

[0056] It should be noted that during the actual assembly, when selecting the size of the nozzle 1, the thickness of the output layer and the molding mesh 4 should be referred to. Under the action of pressure, the height of the nozzle 1 protruding from the input layer should be less than the thickness of the output layer and the molding mesh 4 to avoid collision between the nozzle 1 and the injection cavity during the molding process, thereby reducing the probability of damage to the nozzle 1 and the injection cavity.

[0057] As a preferred embodiment of the present invention, the installation frame 2 includes an upper pressing frame 25 and a lower pressing frame 26 which are hinged to each other. A through groove 27 is provided on one side of the hinge between the upper pressing frame 25 and the lower pressing frame 26. The connecting heads 24 are all installed in the through groove 27. 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 squeeze and block the dispersion net 3.

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

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

[0060] In order to increase the application range of the device, the installation frame 2 in the present invention is composed of an upper pressing frame 25 and a lower pressing frame 26, and the upper pressing frame 25 and the lower pressing frame 26 are both spliced ​​by multiple telescopic rods, so that the installation frame 2 can be flexibly adjusted within the designed range. At the same time, after the upper and lower molds are closed and press the molding net 4, the molding net 4 is deformed, but the edge of the molding net 4 is not within the spraying range. Therefore, at this time, the staff adjusts the range of the installation frame 2 so that the installation frame 2 can cover the injection molding chamber to be sprayed and can minimize the selection range of the installation frame 2. Subsequently, when the upper and lower molds are brought closer to each other again, the upper and lower molds press the sealing gasket ring 21 on the installation frame 2, causing the upper pressing frame 25 and the lower pressing frame 26 to gradually close. Closing, during this process, the rubber pressure strip 41 on the upper pressing frame 25 and the rubber pressure strip 41 on the lower pressing frame 26 are gradually closed, and then the dispersion net 3 between the two is clamped. Under the action of the clamping pressure, the dispersion net 3 is deformed, and the dispersion net 3 inside and outside the installation 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 can be blocked, so that the compressed air and the release agent are dispersed only in the dispersion net 3 within the coverage of the installation frame 2. At the same time, when the negative pressure is extracted, the negative pressure can also act only on the dispersion net 3 within the coverage of the installation frame 2, so as to flexibly adjust the use range of the dispersion net 3. When injection molds of different volumes and models are used, the application range of the spraying device is increased.

[0061] As a preferred embodiment of the present invention, it also includes a circulation purification mechanism, which is conductively connected to the air extraction pipe 22 and the air delivery pipe 31;

[0062] The circulation purification mechanism includes a coarse filter box 5 and a final filter box 51;

[0063] The coarse filter box 5 is conductively connected to the output end of the vacuum pump 23, and the coarse filter box 5 is conductively connected to the final filter box 51 through a pipeline. Multiple layers of filter screens are fixedly installed in the coarse filter box 5, and the final filter box 51 is filled with adsorption fillers.

[0064] The circulation purification mechanism further includes a three-way valve 52 , which is installed between the coarse filter box 5 and the final filter box 51 , and is connected to the gas delivery pipe 31 through the delivery pipeline 12 .

[0065] During the process of exhaust gas extraction and collection, the vacuum pump 23 continuously extracts air and pumps the airflow into the coarse filter box 5. The liquid components in the airflow are intercepted and gathered in the coarse filter box 5 through the filter screen in the coarse filter box 5, while the gaseous components, along with a small amount of liquid components, enter the three-way valve 52. If the release agent is being sprayed at this time, the communication channel between the three-way valve 52 and the air pipe 31 is opened, so that the airflow enters the air pipe 31, and the content of outside air participating in the spraying is reduced as much as possible, thereby reducing the total amount of exhaust gas finally discharged. When the spraying is finished at this time, the communication channel between the three-way valve 52 and the final filter box 51 is opened, so that the airflow is discharged from the three-way valve 52. It flows into the final filter box 51, and after being adsorbed and purified by the adsorption filler in the final filter box 51, it is discharged to the outside. The switching of the channel of the three-way valve 52 can be controlled by a control program or manually operated. In actual application, the waste gas is used after coarse filtration. Since the waste gas itself is a release agent separation product, the waste gas replaces the air to dilute the release agent without affecting the spraying of the release agent. The recycling of the waste gas reduces the use of external air and the total emission of waste gas, which can reduce the burden on the final filter box 51 and the replacement frequency of the adsorption filler in the final filter box 51, and at the same time reduce the total amount of exhaust gas and reduce the impact on the external environment.

[0066] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A spraying device for bumper injection molding, comprising a spray head (1), wherein the spray head (1) is used for spraying a mold release agent, and the spray head (1) is externally connected to a pumping device (11) through a delivery pipeline (12); Features: It also includes a plugging and exhausting mechanism, which is installed on the injection mold and is used to seal and exhaust the injection mold; The sealing and exhaust mechanism comprises: a mounting frame (2), a sealing gasket ring (21), a guide plate and an exhaust pipe (22); The installation frame (2) is a frame-type structure, the sealing rings (21) are symmetrically arranged on both sides of the installation frame (2), and the sealing rings (21) are made of elastic rubber material; An air extraction pipe (22) is embedded and fixedly mounted on the sealing gasket ring (21), and the air extraction pipe (22) is externally connected to an air extraction pump (23); It also includes a dispersion mechanism, which is installed on the installation frame (2) and cooperates with the spray head (1) and the exhaust pipe (22) to enhance the dispersion of the spraying and exhausting effects.

2. A spraying device for bumper injection molding according to claim 1, characterized in that: The dispersion mechanism comprises a dispersion net (3) and a connector (24); The dispersion net (3) is a grid-like structure, the dispersion net (3) is mounted on the mounting frame (2), the inner cavity of the dispersion net (3) is provided with a plurality of cavities which are not connected to each other, the nozzle (1) is mounted on the dispersion net (3), and the nozzle (1) is connected to the inner cavity of the dispersion net (3); The connector (24) is installed on the dispersion net (3), and the connector (24) is used to connect the dispersion net (3) with the air extraction pipe (22) and the delivery pipe (12).

3. A spraying device for bumper injection molding according to claim 2, characterized in that: The dispersion network (3) comprises an input layer and an output layer, wherein the input layer is woven from an air delivery pipe (31) and a liquid delivery pipe (32), and the output layer is woven from a negative pressure pipe (33) with holes on the surface. The output layer is located on the upper and lower sides of the input layer, and the output layer is connected to the air extraction pipe (22) via a connector (24). The input layer is connected to the delivery pipeline (12) via a connector (24). The nozzle (1) is mounted on the input layer, and the nozzle (1) is conductively connected to the air delivery pipe (31) and the liquid delivery pipe (32).

4. A spraying device for bumper injection molding according to claim 3, characterized in that: A shaping net (4) is fixedly installed inside the dispersion net (3); the shaping net (4) is located between the input layer and the output layer; and the shaping net (4) is made of a plastic metal material.

5. A spraying device for bumper injection molding according to claim 4, characterized in that: The installation frame (2) comprises an upper pressing frame (25) and a lower pressing frame (26) which are hinged to each other. A through groove (27) is provided on one side of the hinge between the upper pressing frame (25) and the lower pressing frame (26). The connecting heads (24) are all installed in the through groove (27). 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) squeeze and block the dispersion net (3).

6. A spraying device for bumper injection molding according to claim 5, characterized in that: The upper pressing frame (25) and the lower pressing frame (26) are both provided with rubber pressure strips (41), and the rubber pressure strips (41) are arranged alternately.

7. A spraying device for bumper injection molding according to claim 6, characterized in that: The upper pressing frame (25) and the lower pressing frame (26) are both formed by splicing a plurality of telescopic rods, and the sealing gasket ring (21) is an annular structure formed by a plurality of sealing strips.

8. A spraying device for bumper injection molding according to claim 3 or 7, characterized in that: It also includes a circulation purification mechanism, which is in conductive connection with the air extraction pipe (22) and the air delivery pipe (31); The circulation purification mechanism comprises a coarse filter box (5) and a final filter box (51); The coarse filter box (5) is conductively connected to the output end of the air extraction pump (23), and the coarse filter box (5) is conductively connected to the final filter box (51) via 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 an adsorption filler.

9. A spraying device for bumper injection molding according to claim 8, characterized in that: The circulation purification mechanism further comprises a three-way valve (52), wherein the three-way valve (52) is installed between the coarse filter box (5) and the final filter box (51), and the three-way valve (52) is conductively connected to the gas delivery pipe (31) via a delivery pipeline (12).

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