Foaming injection gun head safety protection interlocking mechanism

Abstract

The invention relates to the technical field of safety interlocking, in particular to a safety protection interlocking mechanism of a foaming injection gun head. Compared with an existing scheme depending on infrared monitoring, the gravity sensing pad adopted by the mechanism is not interfered by environmental factors such as strong light, dust and water vapor in a workshop, the monitoring stability and accuracy are greatly improved, the conveying pipeline is closed in advance in the second-stage sensing area, the accumulation amount of raw materials in the injection gun head is reduced, and the production efficiency is improved. Therefore, the raw materials can be basically emptied in the subsequent short-time injection process of the injection gun head. Thus, when a person continues to enter the third-level induction area and the injection gun head stops injection, few raw materials are left in the injection gun head, the risk that the injection gun head is blocked due to continuous foaming of the raw materials is remarkably reduced, normal use of the injection gun head is maintained to the maximum extent on the premise that the safety of the person is ensured through the staged safety protection strategy, and the safety of the person is improved. And the relationship between safety and production is effectively balanced. The device can be widely applied to the technical field of safety interlocking.

Description

Technical Field

[0001] The invention relates to the technical field of safety interlocking, in particular to a safety protection interlocking mechanism for a foaming injection gun head. Background Art

[0002] In the foaming process, there are strict requirements for the specific process. Before foaming, the mold needs to be preheated, and the raw materials required for foaming are pumped from the turnover tank into the mixing syringe through the pipeline, and then injected into the mold through the mixing syringe for foaming. It is worth noting that the mixed material must be injected into the mold within 5-15 seconds, that is, before the start of the milky white phase. This is because if the injection is delayed, the mixed material may foam prematurely in the pipeline or syringe, causing the syringe to be blocked, affecting the continuity of production, and may also cause uneven density of the final product, seriously affecting product quality.

[0003] However, the foaming process is somewhat dangerous. Since the syringe is in a high-speed running state when working and the internal pressure is relatively high, if the staff accidentally enters the working area of ​​the syringe without knowing it, it is very likely to cause accidental injury. The existing technology generally uses infrared monitoring equipment for monitoring. When someone enters the dangerous area near the syringe, the infrared monitoring equipment can sense it in time and immediately control the syringe to stop injecting the foaming raw material into the mold, thereby ensuring the safety of the staff to a certain extent.

[0004] However, the existing safety protection scheme based on infrared monitoring equipment has the following problems. First, the infrared monitoring equipment may be interfered by environmental factors, such as strong light, dust, water vapor, etc. in the workshop, which may lead to misjudgment or missed judgment of the monitoring results. When a misjudgment occurs, the injection of the syringe may be stopped for no reason, affecting production efficiency; and when a missed judgment occurs, it is impossible to detect the personnel entering the dangerous area in time, resulting in safety accidents. Second, the raw materials that have not been discharged from the syringe will continue to foam, causing the syringe to be blocked.

[0005] To sum up, although the existing foaming process has taken certain measures to ensure the safety of workers, there are still many shortcomings. It is urgent to develop a foaming injection gun head safety protection interlock mechanism to further improve the safety and production efficiency of the foaming process. Summary of the invention

[0006] The purpose of the present invention is to provide a foaming injection gun head safety protection interlocking mechanism to solve the problem of safety and production efficiency being affected by false judgments and syringe blockage due to environmental interference in infrared monitoring protection solutions.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] The safety protection interlock mechanism of the foaming injection gun head includes a raw material tank, a conveying pipeline, a flow valve, an injection gun head, a control cabinet and an alarm device, and further includes a sensing pad arranged on the ground outside the injection gun head, and a gravity sensing device is arranged inside the sensing pad;

[0009] The area where the sensing pad is located is successively the first-level sensing area, the second-level sensing area and the third-level sensing area from far to near according to the distance from the injection gun head; when a person enters the first-level sensing area, the alarm device is turned on; when entering the second-level sensing area, the alarm device continues to be turned on and the flow valve controls the conveying pipeline to close; when entering the third-level sensing area, the alarm device is turned on, the flow valve closes the conveying pipeline and the syringe immediately stops the injection operation.

[0010] The safety protection interlock mechanism of the foaming injection gun head is based on the detection of the approach of personnel by the gravity sensing device in the sensing pad, and adopts a hierarchical response according to different distance areas. When a person steps into the first-level sensing area, the gravity sensing device in the sensing pad senses the pressure change, triggers the alarm device, and sends a warning of approaching the dangerous area to the person, reminding them to proceed with caution. If the person continues to approach and enters the second-level sensing area, the alarm device continues to work, and at the same time the flow valve receives a signal and closes the conveying pipeline. At this time, although there is still a small amount of raw material in the injection gun head that can continue to be injected, the injection time is short because the raw material supply stops, aiming to ensure that the injection is basically completed before the person enters the third-level sensing area. Once a person enters the third-level sensing area, the alarm device sounds continuously, the flow valve remains closed, and the injection gun head immediately stops the injection operation to absolutely ensure the safety of the person, even if it may have a certain impact on the injection gun head.

[0011] Compared with the existing solutions that rely on infrared monitoring, the gravity sensing pad adopted by this mechanism is not affected by environmental factors such as strong light, dust, and water vapor in the workshop, greatly improving the stability and accuracy of monitoring, avoiding misjudgment and missed judgment caused by environmental interference, ensuring that the production efficiency is not reduced due to misstop, and preventing personnel safety accidents caused by missed judgment.

[0012] Closing the conveying pipeline in advance in the second-level sensing area reduces the accumulation amount of raw material in the injection gun head, enabling the injection gun head to basically empty the raw material during the subsequent short-time injection process. In this way, when the person continues to enter the third-level sensing area and the injection gun head stops injecting, the residual raw material inside is less, significantly reducing the risk of the injection gun head being blocked due to the continuous foaming of the raw material, ensuring the continuity of production, maintaining the stability of product quality, and avoiding affecting the quality due to uneven product density. Through this hierarchical safety protection strategy, while ensuring the safety of personnel, the normal use of the injection gun head is maximally maintained, effectively balancing the relationship between safety and production.

[0013] Preferably, the induction pad is internally provided with a plurality of cavities. Inside the cavities, a first conductive component, a first insulating plate, a second conductive component, a second insulating plate, and a third conductive component are sequentially arranged from bottom to top. A plurality of induction holes communicating with the cavities are formed on the upper end surface of the induction pad. The first conductive component includes a first positive electrode connector and a first negative electrode connector that do not contact each other.

[0014] The induction device includes a first induction column. The first induction column can move up and down in the induction holes at the primary induction area. A spring is fixed at the bottom of the cavity. Under the elastic force of the spring, one end of the first induction column extends out of the induction hole. The first induction column includes a first insulating portion and a first conductive portion. When a person steps on the first induction column, the first induction column moves downward against the elastic force of the spring. At this time, the first conductive portion of the first induction column will electrically connect the first positive electrode connector and the first negative electrode connector. The circuit where the first positive electrode connector and the first negative electrode connector are located is connected in series with the circuit where the alarm device is located.

[0015] The multiple cavities inside the induction pad constitute the basic structure for pressure induction. Below the induction holes corresponding to the primary induction area, a first induction column is provided, which can move up and down in the induction holes. The spring at the bottom of the cavity provides an upward elastic force for the first induction column, so that one end of the first induction column extends out of the induction hole under normal conditions.

[0016] This design can accurately sense whether a person enters the primary induction area. Only when a person steps on a specific first induction column will the connection between the first positive electrode connector and the first negative electrode connector be triggered, thereby activating the alarm device. Compared with some broad induction methods, it greatly improves the accuracy of alarm triggering and avoids false alarms caused by environmental factors or non-personnel factors.

[0017] Preferably, the induction device includes a second induction column. The second induction column can move up and down in the induction holes at the secondary induction area. Under the elastic force of the spring, one end of the second induction column extends out of the induction hole. The second induction column includes a second insulating portion and a second conductive portion. There are two second conductive portions, and the two second conductive portions are insulated from each other.

[0018] When a person steps on the second induction column, the second induction column moves downward against the elastic force of the spring. At this time, one of the second conductive portions of the second induction column electrically connects the second positive electrode connector and the second negative electrode connector, and the other second conductive portion electrically connects the first positive electrode connector and the first negative electrode connector. The control cabinet can receive the electrical signal that the second positive electrode connector and the second negative electrode connector are connected, and then control the flow valve to close the conveying pipeline.

[0019] Through the unique design of the structure and function of the second induction column, more precise control of the secondary induction area is achieved. It not only continues the alarm function of the primary induction area but also, based on the new circuit connection method, triggers the control cabinet to control the flow valve, further strengthening the hierarchy and pertinence of the safety protection measures, enabling the entire safety protection interlock mechanism to respond differently according to the degree of personnel approaching the dangerous area. This design ensures personnel safety while maintaining production continuity as much as possible. When personnel enter the secondary induction area, by closing the conveying pipeline, the further replenishment of raw materials in the injection gun head is reduced, lowering the risk of blockage or other failures caused by a large amount of raw materials in the injection gun head when personnel continue to approach and more dangerous situations occur. At the same time, a certain amount of time is given for the injection gun head to consume the existing raw materials inside, finding a good balance between safety and production.

[0020] Preferably; the induction device includes a third induction column, which can move up and down in the induction hole at the tertiary induction area. Under the elastic force of the spring, one end of the third induction column extends out of the induction hole; the third induction column includes a third insulating part and a third conductive part. There are three third conductive parts, and the three third conductive parts are insulated from each other;

[0021] When a person steps on the third induction column, the third induction column moves downward against the elastic force of the spring. At this time, one of the third conductive parts of the third induction column electrically connects the third positive terminal and the third negative terminal, another third conductive part electrically connects the second positive terminal and the second negative terminal, and the last third conductive part electrically connects the third positive terminal and the third negative terminal. The control cabinet can receive the electrical signal of the connection between the third positive terminal and the third negative terminal, and then control the injection gun head to close.

[0022] Through the unique design of the third induction column, a comprehensive and precise response is made to the most dangerous situation of personnel entering the tertiary induction area. It not only continues the first two levels of protection measures but also additionally triggers the closing action of the injection gun head. Once personnel enter the tertiary induction area, the operation stops immediately regardless of whether there is still raw material remaining in the syringe, thus ensuring the safety of the staff.

[0023] Preferably; when there is no external force, the heights of the first induction column, the second induction column, and the third induction column extending out of the induction pad are 1 - 2 cm.

[0024] This height neither causes a large hindrance to the normal walking of personnel nor requires personnel to deliberately step on the induction column, conforming to the ergonomic principle and ensuring the natural and smooth movement of personnel at the foaming operation site. Without affecting the normal work process, it can trigger safety protection measures in a timely and effective manner, enhancing the practicality and usability of the entire safety protection interlock mechanism.

[0025] Preferably, a limiting post is arranged in the cavity, the height of the limiting post is 1-2 cm, and limiting grooves for inserting the limiting post are arranged at the bottoms of the first induction post, the second induction post and the third induction post.

[0026] The limiting post is inserted into the limiting groove at the bottom of the induction post, which provides a guiding function for the up and down movement of the induction post. When a person steps on the induction post, it can effectively prevent the induction post from tilting or shifting, ensure that the induction post moves vertically downward, so that the conductive part accurately connects the corresponding positive and negative connectors, avoid abnormal circuit connection caused by the movement deviation of the induction post, and further improve the accuracy and reliability of induction.

[0027] Preferably, anti-slip patterns are arranged on the upper end faces of the first induction post, the second induction post and the third induction post.

[0028] By increasing the friction force, the anti-slip patterns greatly improve the accuracy and reliability of the induction post triggering. In actual production scenarios, the movement states of personnel are diverse. Without anti-slip design, the sliding of the soles may cause uneven force on the induction post, avoiding personnel slipping.

[0029] Preferably, each cavity of the induction pad is provided with a detachable sealing cover. The cavity outlet extends around to form a lapping groove, and further includes a bolt. A threaded hole is arranged on the bottom wall of the lapping groove, and the sealing cover is fixed in the lapping groove by the cooperation of the bolt and the threaded hole.

[0030] Each cavity of the induction pad is equipped with a detachable sealing cover, which provides convenience for the maintenance and overhaul of the internal structure of the induction pad. The sealing cover is fixed to the induction pad by the cooperation of the bolt and the threaded hole on the bottom wall of the lapping groove. When it is necessary to check, repair or replace components such as the induction post, spring, and conductive component inside the cavity, the operator only needs to use a tool to unscrew the bolt, then can easily remove the sealing cover and enter the cavity for operation. After the operation is completed, place the sealing cover back in the lapping groove and tighten the bolt to restore the sealed state of the induction pad and ensure its normal operation.

[0031] Preferably, the alarm device includes a warning bell and a light strip arranged on the induction pad.

[0032] The warning bell emits a loud sound signal to attract the auditory attention of the surrounding people and warns that people have entered the vicinity of the dangerous area. The light strip arranged on the induction pad gives an intuitive warning visually by emitting a conspicuous light signal. Description of the Drawings

[0033] Figure 1 It is a schematic diagram of the overall structure of the safety mat in the embodiment;

[0034] Figure 2 It is a sectional view of the first induction post at the induction hole in the embodiment;

[0035] Figure 3 Exploded view of the safety mat and the support plate in the embodiment;

[0036] Figure 4 Schematic structural view of the third induction post in the embodiment;

[0037] Figure 5 Schematic structural view of the second induction post in the embodiment;

[0038] Figure 6 Schematic structural view of the first induction post in the embodiment.

[0039] 110. Induction mat; 1101. Primary induction area; 1102. Secondary induction area; 1103. Tertiary induction area; 1104. Induction hole; 120. Cavity; 1201. Spring; 1202. Limit post; 1203. Lapping groove; 1204. Threaded hole; 1301. First positive terminal; 1302. First negative terminal; 140. First insulating plate; 1501. Second positive terminal; 1502. Second negative terminal; 160. Second insulating plate; 1701. Third positive terminal; 1702. Third negative terminal; 180. First induction post; 1801. First insulating part; 1802. First conductive part; 190. Second induction post; 1901. Second insulating part; 1902. Second conductive part; 200. Third induction post; 201. Third insulating part; 202. Third conductive part; 210. Limit groove; 220. Sealing cover; 2201. Bolt; 230. Light strip. Detailed implementation manners

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] Embodiment

[0042] The safety protection interlock mechanism of the foaming injection gun head in this embodiment mainly consists of the following parts:

[0043] Basic components: including a raw material tank, a conveying pipeline, a flow valve, an injection gun head, a control cabinet, and an alarm device. The raw material tank is used to store the raw materials required for foaming. The raw materials pass through the conveying pipeline and are injected into the mold through the injection gun head under the control of the flow valve for foaming operation. The control cabinet is responsible for controlling and coordinating the entire system.

[0044] Inductive pads 110 and related components: Inductive pads 110 are provided on the ground on both sides of the injection gun head, and a gravity sensing device is provided inside the inductive pads 110.

[0045] As Figures 1-6 shown, the upper end surface of the inductive pad 110 is sequentially divided into a first-level sensing area 1101, a second-level sensing area 1102, and a third-level sensing area 1103 according to the distance from the injection gun head. In order to make the drawings in this embodiment more concise and intuitive, a cavity 120 is provided in each sensing area. In actual application, the number of cavities 120 should be reasonably divided according to the size of the sensing area.

[0046] Inside the cavity 120, a first conductive component, a first insulating plate 140, a second conductive component, a second insulating plate 160, and a third conductive component are arranged in sequence from bottom to top. The upper end surface of the inductive pad 110 is provided with a sealing cover 220 for closing the cavity 120, and a plurality of sensing holes 1104 are provided on the sealing cover 220. A lapping groove 1203 extends around the outlet of the cavity 120, and a threaded hole 1204 is provided on the bottom wall of the lapping groove 1203. It is fixed in the lapping groove 1203 by cooperating with the sealing cover 220 through a bolt 2201.

[0047] First-level sensing area 1101: A first sensing post 180 is provided, which can move up and down in the sensing hole 1104 in the first-level sensing area 1101. A spring 1201 is fixed at the bottom of the cavity 120. Under the elastic force of the spring 1201, one end of the first sensing post 180 extends out of the sensing hole 1104, and the extending height is 1-2 cm; the first sensing post 180 is composed of a first insulating part 1801 and a first conductive part 1802.

[0048] Second-level sensing area 1102: A second sensing post 190 is provided, which can also move up and down in the sensing hole 1104 in the second-level sensing area 1102, and one end extends out of the sensing hole 1104 under the action of the spring 1201; the second sensing post 190 includes a second insulating part 1901 and two mutually insulated second conductive parts 1902.

[0049] Third-level sensing area 1103: A third sensing post 200 is equipped, which can move up and down in the sensing hole 1104 in the third-level sensing area 1103, and one end extends out of the sensing hole 1104 under the elastic force of the spring 1201. The third sensing post 200 is composed of a third insulating part 201 and three mutually insulated third conductive parts 202. Anti-slip patterns are provided on the upper end surfaces of the first, second, and third sensing posts.

[0050] Other auxiliary components:

[0051] The cavity 120 is provided with a limiting post 1202, with a height of 1 - 2 cm, which is the same as the height of the sensing post protruding from the sensing pad 110. The bottoms of the first sensing post 180, the second sensing post 190, and the third sensing post 200 are all provided with limiting grooves 210 for the limiting post 1202 to be inserted.

[0052] Alarm device: It consists of an alarm bell and a light strip 230 arranged on the sensing pad 110. The light strip 230 is arranged at the junction of each sensing area, so that the staff can better distinguish each sensing area.

[0053] Principle of the safety protection interlock mechanism of the foaming injection gun head

[0054] Induction and graded response principle: When a person approaches the injection gun head and steps into different areas of the sensing pad 110, based on the gravity sensing device in the sensing pad 110 perceiving the pressure change, graded response is achieved.

[0055] First - level sensing area 1101: When a person steps on the first sensing post 180 in the first - level sensing area 1101, the first sensing post 180 overcomes the elastic force of the spring 1201 and moves downward. Its first conductive part 1802 electrically connects the first positive terminal 1301 and the first negative terminal 1302. Since this circuit is in series with the circuit where the alarm device is located, the alarm bell in the alarm device rings and the light strip 230 lights up, sending a warning to the person that they are approaching a dangerous area initially.

[0056] When the person leaves the first - level sensing area, the first sensing post 180 moves upward under the action of the spring 1201, and the first conductive part 1802 moves between the two first insulating plates 140.

[0057] Second - level sensing area 1102: When a person enters the second - level sensing area 1102 and steps on the second sensing post 190, the second sensing post 190 overcomes the elastic force of the spring 1201 and moves downward. One of the second conductive parts 1902 electrically connects the second positive terminal 1501 and the second negative terminal 1502, and the other second conductive part 1902 electrically connects the first positive terminal 1301 and the first negative terminal 1302 again. After the control cabinet receives the electrical signal that the second positive terminal 1501 and the second negative terminal 1502 are connected, it controls the flow valve to close the conveying pipeline. At this time, the alarm device continues to work. Although there is a small amount of raw material in the injection gun head that can continue to be injected, since the raw material replenishment stops and the injection time is short, it is basically injected before the person enters the third - level sensing area 1103.

[0058] When the person leaves the second - level sensing area, the second sensing post 190 moves upward under the action of the spring 1201, and the second conductive part 1902 moves between the two second insulating plates 160.

[0059] Third-level induction area 1103: When a person steps into the third-level induction area 1103 and steps on the third induction column 200, the third induction column 200 displaces downward against the elastic force of the spring 1201. One third conductive part 202 electrically connects the third positive terminal connector 1701 and the third negative terminal connector 1702, another third conductive part 202 electrically connects the second positive terminal connector 1501 and the second negative terminal connector 1502, and the last third conductive part 202 electrically connects the third positive terminal connector 1701 and the third negative terminal connector 1702 again. The control cabinet receives the electrical signal that the third positive terminal connector 1701 and the third negative terminal connector 1702 are connected, and then controls the injection gun head to close. At this time, the alarm device sounds continuously, and the flow valve remains closed.

[0060] When the person leaves the third induction area, the third induction column 200 moves upward under the action of the spring 1201, and the third conductive part 202 moves above the third conductive component.

[0061] To ensure accurate reset, a limiting part can be set in the cavity 120 to control the maximum upward movement distance of each induction column. This technology belongs to common technology and will not be elaborated too much in this embodiment.

[0062] Auxiliary principle of other components:

[0063] Limit post 1202 and limit groove 210: The limit post 1202 is inserted into the limit groove 210 at the bottom of the induction column to provide guidance for the up and down movement of the induction column. When a person steps on the induction column, it prevents it from tilting or shifting, ensures vertical downward movement, enables the conductive part to accurately connect the corresponding positive and negative terminal connectors, and guarantees the induction accuracy.

[0064] Through a hierarchical safety protection strategy, the approach of personnel to dangerous areas is accurately detected and responded to, effectively ensuring personnel safety. It avoids safety accidents caused by misjudgment and missed judgment due to environmental interference in infrared monitoring.

[0065] The multi-level induction and response mechanism, from warning to gradually strengthening protection until the injection gun head operation stops, constructs a tight safety protection net. On the basis of ensuring personnel safety to the greatest extent, it also ensures production continuity and equipment safety:

[0066] In the second-level induction area 1102, the conveying pipeline is closed in advance, reducing the accumulation amount of raw materials in the injection gun head, enabling the injection gun head to basically empty the raw materials in a short time, reducing the risk of the injection gun head being blocked due to continuous foaming of the raw materials when a person enters the third-level induction area 1103, ensuring production continuity, maintaining the stability of product quality, and avoiding uneven product density.

Claims

1. The foaming injection gun head safety protection interlocking mechanism includes a raw material tank, a conveying pipeline, a flow valve, an injection gun head, a control cabinet and an alarm device, which is characterized by: It also includes a sensing pad (110) arranged on the ground outside the injection gun head, and a gravity sensing device is arranged inside the sensing pad (110); The areas where the sensing pad (110) is located are, in descending order, a primary sensing area (1101), a secondary sensing area (1102) and a tertiary sensing area (1103) according to the distance from the injection gun head; when a person enters the primary sensing area (1101), the alarm device is turned on; when entering the secondary sensing area (1102), the alarm device continues to be turned on and the flow valve controls the delivery pipeline to be closed; when entering the tertiary sensing area (1103), the alarm device is turned on, the flow valve closes the delivery pipeline and the injector immediately stops the injection operation.

2. The foaming injection gun head safety protection interlocking mechanism according to claim 1 is characterized in that: A plurality of cavities (120) are provided inside the sensing pad (110), a first conductive component, a first insulating plate (140), a second conductive component, a second insulating plate (160) and a third conductive component are provided in the cavity (120) from bottom to top, a plurality of sensing holes (1104) connected to the cavities (120) are provided on the upper end surface of the sensing pad (110), and the first conductive component comprises a first positive electrode connector (1301) and a first negative electrode connector (1302) that are not in contact with each other; The sensing device comprises a first sensing column (180), the first sensing column (180) can move up and down in a sensing hole (1104) at a primary sensing area (1101), a spring (1201) is fixed at the bottom of the cavity (120), and under the elastic force of the spring (1201), one end of the first sensing column (180) extends out of the sensing hole (1104); the first sensing column (180) comprises a first insulating portion (1801) and a first conductive portion (1802), when a person steps on the first sensing column (180), the first sensing column (180) overcomes the elastic force of the spring (1201) and moves downward, at this time, the first conductive portion (1802) of the first sensing column (180) electrically connects the first positive terminal (1301) and the first negative terminal (1302), and the circuit where the first positive terminal (1301) and the first negative terminal (1302) are located is connected in series with the circuit where the alarm device is located.

3. The foaming injection gun head safety protection interlocking mechanism according to claim 2 is characterized in that: The sensing device comprises a second sensing column (190), the second sensing column (190) can move up and down in a sensing hole (1104) at a secondary sensing area (1102), and under the elastic force of a spring (1201), one end of the second sensing column (190) extends out of the sensing hole (1104); the second sensing column (190) comprises a second insulating portion (1901) and a second conductive portion (1902), two second conductive portions (1902) are provided, and the two second conductive portions (1902) are insulated from each other; the second conductive component comprises a second positive electrode connector (1501) and a second negative electrode connector (1502) that are not in contact with each other; When a person steps on the second sensing column (190), the second sensing column (190) overcomes the elastic force of the spring (1201) and moves downward. At this time, one of the second conductive parts (1902) of the second sensing column (190) electrically connects the second positive electrode connector (1501) with the second negative electrode connector (1502), and the other second conductive part (1902) electrically connects the first positive electrode connector (1301) with the first negative electrode connector (1302). The control cabinet can receive an electrical signal indicating that the second positive electrode connector (1501) and the second negative electrode connector (1502) are connected, thereby controlling the flow valve to close the delivery pipeline.

4. The foaming injection gun head safety protection interlocking mechanism according to claim 3 is characterized in that: The sensing device comprises a third sensing column (200), the third sensing column (200) can move up and down in a sensing hole (1104) at a third-level sensing area (1103), and under the elastic force of a spring (1201), one end of the third sensing column (200) extends out of the sensing hole (1104); the third sensing column (200) comprises a third insulating portion (201) and a third conductive portion (202), three third conductive portions (202) are provided, and the three third conductive portions (202) are insulated from each other; the third conductive component comprises a third positive electrode connector (1701) and a third negative electrode connector (1702) that are not in contact with each other; When a person steps on the third sensing column (200), the third sensing column (200) overcomes the elastic force of the spring (1201) and moves downward. At this time, one of the third conductive parts (202) of the third sensing column (200) electrically connects the third positive terminal (1701) with the third negative terminal (1702), another third conductive part (202) electrically connects the second positive terminal (1501) with the second negative terminal (1502), and the last third conductive part (202) electrically connects the third positive terminal (1701) with the third negative terminal (1702). The control cabinet can receive an electrical signal indicating that the third positive terminal (1701) and the third negative terminal (1702) are connected, thereby controlling the injection gun head to be closed.

5. The foaming injection gun head safety protection interlocking mechanism according to any one of claims 2 to 4, characterized in that: When no external force is applied, the height of the first sensing column (180), the second sensing column (190) and the third sensing column (200) extending out of the sensing pad (110) is 1-2 cm.

6. The foaming injection gun head safety protection interlocking mechanism according to claim 5 is characterized in that: A limiting column (1202) is provided in the cavity (120), the height of the limiting column (1202) is 1-2 cm, and the bottoms of the first sensing column (180), the second sensing column (190) and the third sensing column (200) are all provided with limiting grooves (210) for the limiting column (1202) to be inserted.

7. The foaming injection gun head safety protection interlocking mechanism according to claim 5, characterized in that: The upper end surfaces of the first sensing column (180), the second sensing column (190) and the third sensing column (200) are all provided with anti-slip patterns.

8. The foaming injection gun head safety protection interlocking mechanism according to claim 2, characterized in that: Each cavity (120) of the sensing pad (110) is provided with a detachable sealing cover (220), and an exit of the cavity (120) extends in all directions to form a lap groove (1203), which also includes a bolt (2201). A threaded hole (1204) is provided on the bottom wall of the lap groove (1203), and the sealing cover (220) is fixed in the lap groove (1203) by the bolt (2201) and the threaded hole (1204) being matched.

9. The foaming injection gun head safety protection interlocking mechanism according to claim 1, characterized in that: The alarm device comprises an alarm bell and a light strip (230) arranged on the induction pad (110).

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