Car crash dummy skin layer perfusion equipment

Abstract

The present invention relates to the field of automobile collision dummies, and discloses an automobile collision dummy skin layer perfusion device. The device comprises: a resin solution constant temperature system, which is used to maintain the resin solution to be injected into the collision dummy skin layer mold within a set temperature range; a resin injection pressure control system, which is used to control the flow rate of injecting the resin solution into the collision dummy skin layer mold; a collection system, which is used to collect a gas-liquid mixture before and after injecting the resin solution into the collision dummy skin layer mold, and separate the gas in the gas-liquid mixture to obtain a resin solution that does not contain gas. The perfusion device provided by the embodiment of the present invention can achieve a relatively stable control of the flow rate of the resin solution injected into the mold, thereby avoiding bringing gas into the mold and affecting the flatness and uniformity of the dummy skin. At the same time, the resin solution injected into the mold can be maintained at a set temperature, which is conducive to controlling the viscosity and density of the resin solution within a reasonable range.

Description

Technical Field

[0001] The invention relates to the field of automobile collision dummies, and in particular to a skin layer perfusion device for automobile collision dummies. Background Art

[0002] With the growth of car ownership and the popularization of intelligent assisted driving systems, people are paying more and more attention to car safety. By analyzing the posture of the collision dummy in the car and the data collected by various sensors during the active and passive safety tests of the car, the safety of the car can be effectively tested. The dummy skin is the outermost structure of the collision dummy. It will inevitably collide with the interior parts of the car during the test. Due to the complex structure of the dummy and the need for repeated use, the skin layer needs to consider not only the structural parameters and bionic mechanical properties required by the test, but also high strength and fatigue damage resistance to effectively protect its internal muscle layer, skeleton and precision sensors.

[0003] When injecting liquid into the skin layer of a collision dummy, it is necessary to inject a resin solution that is mixed and stirred in a certain ratio into a high-temperature mold. However, the existing method of injection is manual injection, which results in a poor flow state of the resin solution along the gap between the inner wall of the mold and the embedded skeleton. It is very likely that the solution will condense due to heat during its flow, thereby producing a cavity. Moreover, the manual injection method cannot stably control the flow rate of the solution, which results in air being easily brought into the mold during the injection process. Since the solution is relatively viscous, the gas cannot be spontaneously discharged from the mold, resulting in pore defects in the skin layer after the solution solidifies, which seriously affects the flatness and uniformity of the dummy skin, and further affects key parameters such as the calibration performance of the collision dummy. Therefore, how to prevent gas from entering the mold during the injection of liquid into the skin layer of the collision dummy has become an urgent problem to be solved.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a car collision dummy skin layer perfusion device, through which the flow rate of the resin solution injected into the mold can be more stably controlled, thereby avoiding bringing gas into the mold and affecting the flatness and uniformity of the dummy's skin. At the same time, the resin solution injected into the mold can be maintained at a set temperature, which is conducive to controlling the viscosity and density of the resin solution within a reasonable range.

[0006] The embodiment of the present invention provides a skin layer perfusion device for a car collision dummy, the perfusion device comprising: a resin solution constant temperature system, a resin injection pressure control system and a collection system;

[0007] Wherein, the resin solution constant temperature system is used to maintain the resin solution to be injected into the crash dummy skin layer mold within a set temperature range;

[0008] The resin injection pressure control system is used to control the flow rate of injecting the resin solution into the crash dummy skin layer mold;

[0009] The collection system is used to collect the gas-liquid mixture before and after the resin solution is injected into the crash dummy skin layer mold, and separate the gas in the gas-liquid mixture to obtain a resin solution without gas.

[0010] The embodiments of the present invention have the following technical effects:

[0011] The automobile crash dummy skin layer perfusion equipment provided by the embodiment of the present invention can achieve relatively stable control of the flow rate of the resin solution injected into the crash dummy skin layer mold, thereby avoiding bringing gas into the crash dummy skin layer mold and affecting the flatness and uniformity of the crash dummy skin. At the same time, the resin solution injected into the mold can be maintained at a set temperature, which is beneficial to controlling the viscosity and density of the resin solution within a reasonable range. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a structural schematic diagram of a skin layer perfusion device for a car collision dummy provided by an embodiment of the present invention;

[0014] Figure 2 It is a schematic diagram of the structure of a skin layer perfusion device for a car collision dummy provided by an embodiment of the present invention;

[0015] Figure 3 It is a structural schematic diagram of a temperature-insulating nozzle provided by an embodiment of the present invention;

[0016] Figure 4 It is a partial structural schematic diagram of a temperature-insulating nozzle and a liquid injection extension port provided in an embodiment of the present invention;

[0017] Figure 5 A partial schematic diagram of a skin layer perfusion device for a car collision dummy provided by an embodiment of the present invention;

[0018] Figure 6 A partial schematic diagram of a skin layer perfusion device for a car collision dummy provided by an embodiment of the present invention;

[0019] Figure 7 A schematic structural diagram of a skin layer perfusion device for a car collision dummy provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0021] When injecting liquid into the skin layer of the crash dummy, it is necessary to inject the resin solution mixed in a certain ratio and stirred evenly into the high-temperature mold. However, the existing injection method is manual injection, which results in poor flow of the resin solution along the gap between the inner wall of the mold and the embedded frame. It is very likely that the solution will condense due to heat during its flow, thus generating cavities. Moreover, the manual injection method cannot stably control the flow rate of the solution, which results in air being easily brought into the mold during the injection process. Since the solution is relatively viscous, the gas cannot be spontaneously discharged from the mold, resulting in pore defects in the skin layer after the solution solidifies, which seriously affects the flatness and uniformity of the dummy skin, and thus affects key parameters such as the calibration performance of the crash dummy.

[0022] In response to the above problems, an embodiment of the present invention provides a car collision dummy skin layer perfusion device, which is used to perfuse a resin solution into a collision dummy skin layer mold, aiming to achieve steady-speed perfusion of the resin solution, thereby solving the technical problem that air is easily brought into the mold during the perfusion process, resulting in pore defects in the skin layer after the solution solidifies, seriously affecting the flatness and uniformity of the dummy skin.

[0023] Figure 1 Schematic diagram of the structure of a car crash dummy skin layer perfusion device provided by an embodiment of the present invention. Figure 1 The automobile collision dummy skin layer perfusion equipment specifically includes: a resin solution constant temperature system 110 , a resin injection pressure control system 120 and a collection system 130 .

[0024] Among them, the resin solution constant temperature system 110 is used to maintain the resin solution to be injected into the crash dummy skin layer mold within a set temperature range; the resin injection pressure control system 120 is used to control the flow rate of injecting the resin solution into the crash dummy skin layer mold; the collection system 130 is used to collect the gas-liquid mixture before and after injecting the resin solution into the crash dummy skin layer mold, and separate the gas in the gas-liquid mixture to obtain a resin solution that does not contain gas.

[0025] For example, see Figure 2The structural schematic diagram of a car collision dummy skin layer perfusion device is shown, and the resin solution constant temperature system 110 includes: a circulating thermostat 24, a resin constant temperature barrel 17, a constant temperature quantitative pump 16, a constant temperature barrel water inlet pipe 23, a constant temperature pump water inlet pipe 21, and a constant temperature pump water outlet pipe 22.

[0026] The circulating thermostat 24 has a resistance heating device, a condensation heat dissipation device and a temperature control device, and has a constant temperature capability of 10°C to 50°C; the circulating water in the circulating thermostat 24 flows through the outlet of the circulating thermostat 24 through the constant temperature barrel water inlet pipe 23 and enters the spiral pipeline arranged on the outer wall of the resin constant temperature barrel 17, and the spiral pipeline and the resin constant temperature barrel 17 are made of the same material. The spiral pipeline is installed close to the barrel wall of the resin constant temperature barrel 17 to quickly keep the resin solution in the resin constant temperature barrel 17 constant temperature to the required temperature.

[0027] The circulating water enters the insulation cavity of the constant temperature quantitative pump 16 through the spiral pipeline via the constant temperature pump water inlet pipe 21 , and the circulating water entering the insulation cavity of the constant temperature quantitative pump 16 flows back to the circulation thermostat 24 through the constant temperature pump water outlet pipe 22 .

[0028] When the temperature displayed on the thermometer of the circulating thermostat 24 is consistent with the set temperature, it is determined that the resin solution in the resin constant temperature barrel 17 and the constant temperature metering pump 16 both meet the requirements for infusing the resin solution into the collision dummy skin layer mold. If the set temperature needs to be adjusted, after the set temperature is adjusted, the infusion process of infusing the resin solution into the collision dummy skin layer mold can be carried out when the temperature displayed on the thermometer of the circulating thermostat 24 is consistent with the adjusted set temperature.

[0029] The resin injection pressure control system 120 includes:

[0030] The constant temperature quantitative pump 16, the variable frequency drive motor 15, the resin delivery pipe 18, the resin delivery pipe flowmeter 19, the resin delivery pipe pressure gauge 20, the resin pumping pipe 7, the resin pumping pipe pressure gauge 14, the resin pumping pipe flowmeter 13, the injection pressure regulating valve 25, the injection pressure regulating valve rear flowmeter 4, the injection pressure regulating valve rear pressure gauge 3 and the temperature insulation nozzle 29.

[0031] Among them, the resin delivery pipe flowmeter 19 is used to measure the first flow rate of the resin solution in the resin delivery pipe 18, the resin delivery pipe pressure gauge 20 is used to measure the first pressure in the resin delivery pipe 18, the resin pumping pipe pressure gauge 14 is used to measure the second pressure of the resin solution in the resin pumping pipe 7, the resin pumping pipe flowmeter 13 is used to measure the second flow rate of the resin solution in the resin pumping pipe 7, and the injection pressure regulating valve 25 is installed at the first set position of the resin pumping pipe 7, and is used to adjust the pressure in the resin pumping pipe 7.

[0032] The pressure gauge 3 behind the injection pressure regulating valve is installed at the second setting position of the resin pumping pipe 7. The second setting position is closer to the injection port of the collision dummy skin layer mold than the first setting position, and is used to measure the third pressure at the second setting position of the resin pumping pipe 7.

[0033] The flow meter 4 after the injection pressure regulating valve is used to measure the initial injection velocity of the resin solution poured into the collision dummy skin layer mold through the temperature-insulating nozzle 29.

[0034] The variable frequency drive motor 15 provides driving energy for the constant temperature quantitative pump 16 to inject the resin solution in the resin constant temperature barrel 17 into the collision dummy skin layer mold through the resin delivery pipe 18, the resin pumping pipe 7 and the temperature insulation nozzle 29; by adjusting the output power of the variable frequency drive motor 15 according to the first flow rate, the second flow rate, the first pressure, the second pressure and the third pressure, in cooperation with the injection pressure regulating valve 25, the injection pressure of the resin solution injected into the collision dummy skin layer mold by the temperature insulation nozzle 29 is controlled.

[0035] Among them, one end of the temperature-insulating nozzle 29 is connected to the injection extension port 5 of the crash dummy skin layer mold, and the other end is connected to the resin pumping pipe 7. The resin solution is poured into the crash dummy skin layer mold through the resin pumping pipe 7 and the temperature-insulating nozzle 29.

[0036] For further reference, see Figure 3 The schematic diagram of the structure of a temperature-insulating nozzle 29 is shown, and the temperature-insulating nozzle 29 comprises: a spray pipe 29a, a locking mechanism 29b and a sealing surface 29c. When the resin solution is poured into the crash dummy skin layer mold through the temperature-insulating nozzle 29, the vertical slide grooves on both sides of the locking mechanism 29b are aligned with the cylindrical locking pins 5a (such as the cylindrical locking pins 5a) of the injection extension port 5 of the crash dummy skin layer mold. Figure 4 The thermal insulation nozzle 29 is moved close to the cylindrical locking pin 5a until the bottom end of the vertical slide groove is close to the cylindrical locking pin 5a, and the thermal insulation nozzle 29 is rotated clockwise to make the cylindrical locking pin 5a move close to the spiral slide groove until it is tightened. At this time, the liquid injection extension port 5 is close to the sealing surface 29c of the thermal insulation nozzle 29.

[0037] Among them, after installation, the cross-section of the injection tube 29a is concentric with the circular surface where the injection extension port 5 is located, and the diameter of the injection tube 29a is 4 mm smaller than the inner diameter of the injection extension port 5, so as to avoid direct contact between the injection tube 29a and the high-temperature mold, which may cause the resin solution in the injection tube 29a to condense, affect the injection cross-sectional area and injection pressure, and further affect the uniformity and flatness of the skin layer of the collision dummy.

[0038] On the other hand, the sealed space formed by the injection pipe 29a, the sealing surface 29c and the injection extension port 5 is used to form a smooth skin layer with equal wall thickness in the subsequent process, which is conducive to the injection of the muscle layer material. This structure achieves the purpose of installing and pre-tightening the temperature-insulating nozzle 29 through the cooperation of the locking pin 5a and the slide groove; by designing the hollow structure between the locking mechanism 29b and the injection pipe 29a, the resin solution is prevented from condensing in the injection pipe 29a during the injection process, and the enclosed space formed by the hollow structure is used to form the casting port skin layer, which facilitates the subsequent injection process of the muscle layer.

[0039] The collection system 130 includes: a vacuum barrel 9, a liquid collection barrel (not shown in the figure) placed inside the vacuum barrel 9, a resin reflux pipe 8, a vacuum machine 12, a recovery conversion valve 26, a vacuum valve 10, and a vacuum suction pipe 11.

[0040] The inlet of the resin reflux pipe 8 is connected to one end of the resin pumping pipe 7 close to the injection port of the collision dummy skin layer mold through the recovery conversion valve 26, and the outlet of the resin reflux pipe 8 is connected to the liquid collecting port of the top cover of the vacuum barrel 9, and the liquid collecting port extends 30 cm into the vacuum barrel 9 to the inside of the liquid collecting barrel. Such a design is conducive to the recovery of the gas-liquid mixture under splashing conditions.

[0041] The recovery conversion valve 26 is a T-type valve. When the recovery conversion valve 26 is opened, the resin solution enters the liquid collection barrel through the resin reflux pipe 8. When the recovery conversion valve 26 is closed, the resin solution flows into the collision dummy skin layer mold. Figure 5 The structure of the recovery conversion valve 26 shown in the partial schematic diagram of a car collision dummy skin layer perfusion equipment includes a perfusion horizontal bracket 6 for supporting a collision dummy skin layer mold 1, a vacuum barrel 9, a vacuum valve 10, a vacuum machine 12, a resin reflux pipe 8, a vacuum suction pipe 11 and a resin pumping pipe 7.

[0042] When the recycling is completed, close the recycling conversion valve 26, open the vacuum valve 10, turn on the vacuum machine 12, maintain the vacuum degree of 0.01 bar in the vacuum barrel 9 according to the degree of the vacuum gauge, and close the vacuum machine 12 and the vacuum valve 10 after no bubbles float on the liquid surface, open the lid of the vacuum barrel 9, take out the liquid collection barrel, and pour the resin solution after defoaming back into the resin constant temperature barrel 17.

[0043] For further information, please refer to Figure 6 The figure shows a schematic structural diagram of a skin layer perfusion device for a car collision dummy.

[0044] For further reference, see Figure 7 The structural schematic diagram of a car crash dummy skin layer perfusion device is shown, and the car crash dummy skin layer perfusion device also includes:

[0045] Liquid level measuring tube 27, drain valve 27a and anhydrous ethanol recovery tank 28.

[0046] Before preheating the mold for the skin layer of the collision dummy, place the mold 1 on the mold infusion horizontal support 6, and keep the surface where the injection port 4 is parallel to the horizontal plane. Use a depth gauge to measure the distance from the plane where the injection port 4 is located to the lowest point of the embedded skeleton 2 in the mold 1, and record this distance as the first distance h1. Measure the distance from the plane where the injection port 4 is located to the bottom surface of the liquid level measuring tube 27 as the second distance h2, close the drain valve 27a, fill the mold 1 with anhydrous ethanol, and mark the liquid level height at h1+h2 on the liquid level measuring tube 27. Gradually open the valve 27 to discharge the anhydrous ethanol from the mold 1 until the liquid level in the liquid level measuring tube 27 coincides with the mark, and immediately close the valve 27. At this time, the liquid level in the mold is △h, and the anhydrous ethanol recovery box 28 is used to recover the remaining anhydrous ethanol in the mold 1 and weigh it as m1, and calculate its volume v1. The result of subtracting the volume v2 of anhydrous ethanol in the liquid level measuring tube 27 from the volume v1 is the solution volume v3 required when the liquid level inside the mold 1 is △h. The pouring time required to pour the resin solution to the lowest point of the embedded skeleton 2 in the mold 1 can be determined according to the solution volume v3.

[0047] The automobile crash dummy skin layer perfusion equipment provided by the embodiment of the present invention realizes the constant temperature treatment of the resin solution to be perfused into the crash dummy skin layer mold by setting a resin solution constant temperature system, which is conducive to controlling the concentration of the resin solution within the set range, thereby achieving the purpose of improving the final perfusion effect, so that the obtained dummy skin has good uniformity and flatness; by setting a resin injection pressure control system, the injection pressure of the resin solution during perfusion can be flexibly controlled, and the resin solution can be prevented from being directly sprayed onto other dummy tissues inside the crash dummy skin layer mold, which can improve the performance of the obtained crash dummy skin; by setting a driving motor, the automatic perfusion of the resin solution is realized, and compared with the manual perfusion method, the perfusion at a stable flow rate can be realized, thereby avoiding bringing air into the crash dummy skin layer mold, which is conducive to obtaining a crash dummy skin with good flatness and uniformity. By setting a collection system, the resin solution can be efficiently recovered, which can save related costs and achieve the effect of avoiding environmental pollution.

[0048] It should be noted that the terms used in the present invention are only for describing specific embodiments, rather than limiting the scope of the present application. As shown in the present specification and claims, unless the context clearly indicates an exception, the words "one", "a", "a kind of" and / or "the" do not specifically refer to the singular, but may also include the plural. The terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a process, method or device. In the absence of further restrictions, the elements defined by the sentence "include one..." do not exclude the presence of other identical elements in the process, method or device including the elements.

[0049] It should also be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. A car crash dummy skin layer perfusion device, characterized in that: include: Resin solution constant temperature system, resin injection pressure control system and collection system; Wherein, the resin solution constant temperature system is used to maintain the resin solution to be injected into the crash dummy skin layer mold within a set temperature range; The resin injection pressure control system is used to control the flow rate of injecting the resin solution into the crash dummy skin layer mold; The collection system is used to collect the gas-liquid mixture before and after the resin solution is injected into the crash dummy skin layer mold, and separate the gas in the gas-liquid mixture to obtain a resin solution containing no gas; The resin solution constant temperature system comprises: a circulating thermostat (24), a resin constant temperature barrel (17), a constant temperature quantitative pump (16), a constant temperature barrel water inlet pipe (23), a constant temperature pump water inlet pipe (21), and a constant temperature pump water outlet pipe (22); The circulating thermostat (24) has a resistance heating device, a condensation heat dissipation device and a temperature control device, and has a constant temperature capability of 10°C to 50°C; the circulating water in the circulating thermostat (24) flows through the outlet of the circulating thermostat (24) through the thermostatic barrel water inlet pipe (23) and enters the spiral pipeline arranged on the outer wall of the resin thermostatic barrel (17), and the spiral pipeline and the resin thermostatic barrel (17) are made of the same material; The circulating water enters the heat preservation cavity of the constant temperature quantitative pump (16) through the spiral pipeline via the constant temperature pump water inlet pipe (21), and the circulating water entering the heat preservation cavity of the constant temperature quantitative pump (16) flows back to the circulation thermostat (24) through the constant temperature pump water outlet pipe (22); When the temperature displayed on the thermometer of the circulating thermostat (24) is consistent with the set temperature, it is determined that the resin solution in the resin thermostatic barrel (17) and the thermostatic metering pump (16) both meet the requirements for pouring the resin solution into the crash dummy skin layer mold. If the set temperature needs to be adjusted, after the set temperature is adjusted, the pouring process of pouring the resin solution into the crash dummy skin layer mold can be carried out when the temperature displayed on the thermometer of the circulating thermostat (24) is consistent with the adjusted set temperature; The resin injection pressure control system comprises: The constant temperature quantitative pump (16), the variable frequency drive motor (15), the resin delivery pipe (18), the resin delivery pipe flow meter (19), the resin delivery pipe pressure gauge (20), the resin pumping pipe (7), the resin pumping pipe pressure gauge (14), the resin pumping pipe flow meter (13), the injection pressure regulating valve (25), the injection pressure regulating valve rear flow meter (4), the injection pressure regulating valve rear pressure gauge (3) and the temperature insulation nozzle (29); The resin delivery pipe flow meter (19) is used to measure a first flow rate of the resin solution in the resin delivery pipe (18), the resin delivery pipe pressure meter (20) is used to measure a first pressure in the resin delivery pipe (18), the resin pumping pipe pressure meter (14) is used to measure a second pressure of the resin solution in the resin pumping pipe (7), the resin pumping pipe flow meter (13) is used to measure a second flow rate of the resin solution in the resin pumping pipe (7), and the injection pressure regulating valve (25) is installed at a first setting position of the resin pumping pipe (7) and is used to regulate the pressure in the resin pumping pipe (7); The pressure gauge (3) after the injection pressure regulating valve is installed at a second setting position of the resin pumping pipe (7), the second setting position being closer to the injection port of the crash dummy skin layer mold than the first setting position, and is used to measure a third pressure at the second setting position of the resin pumping pipe (7); The flow meter (4) after the injection pressure regulating valve is used to measure the initial injection velocity of the resin solution injected into the crash dummy skin layer mold through the temperature-insulating nozzle (29); The variable frequency drive motor (15) provides drive energy for the constant temperature quantitative pump (16) so as to inject the resin solution in the resin constant temperature barrel (17) into the crash dummy skin layer mold through the resin delivery pipe (18), the resin pumping pipe (7) and the temperature insulation nozzle (29); the output power of the variable frequency drive motor (15) is adjusted in accordance with the first flow rate, the second flow rate, the first pressure, the second pressure and the third pressure in cooperation with the injection pressure regulating valve (25) so as to control the injection pressure of the resin solution injected into the crash dummy skin layer mold by the temperature insulation nozzle (29); The temperature-insulating nozzle (29) comprises: a spray pipe (29a), a locking mechanism (29b) and a sealing surface (29c); When the resin solution is poured into the crash dummy skin layer mold through the thermal insulation nozzle (29), the vertical slide grooves on both sides of the locking mechanism (29b) are aligned with the cylindrical locking pin (5a) of the injection extension port (5) of the crash dummy skin layer mold, and the thermal insulation nozzle (29) is moved close to the cylindrical locking pin (5a) until the bottom end of the vertical slide groove is in close contact with the cylindrical locking pin (5a), and the thermal insulation nozzle (29) is rotated clockwise to make the cylindrical locking pin (5a) move in close contact with the spiral slide groove until it is tightened, at which time the injection extension port (5) is in close contact with the sealing surface (29c) of the thermal insulation nozzle (29); Among them, after installation, the cross section of the injection pipe (29a) is concentric with the circular surface where the injection extension port (5) is located, and the diameter of the injection pipe (29a) is 4 mm smaller than the inner diameter of the injection extension port (5) to avoid direct contact between the injection pipe (29a) and the high-temperature mold, which may cause the resin solution in the injection pipe (29a) to condense and affect the injection cross-sectional area and injection pressure.

2. The perfusion device according to claim 1, characterized in that The collection system comprises: a vacuum barrel (9), a liquid collection barrel placed inside the vacuum barrel (9), a resin reflux pipe (8), a vacuum machine (12), a recovery conversion valve (26), a vacuum valve (10), and a vacuum suction pipe (11); The inlet of the resin return pipe (8) is connected to one end of the resin pumping pipe (7) close to the injection port of the crash dummy skin layer mold through a recovery conversion valve (26), and the outlet of the resin return pipe (8) is connected to the liquid collecting port of the top cover of the vacuum barrel (9), and the liquid collecting port extends 30 cm into the vacuum barrel (9) to the inside of the liquid collecting barrel; The recovery conversion valve (26) is a T-shaped valve. When the recovery conversion valve (26) is opened, the resin solution enters the liquid collecting barrel through the resin reflux pipe (8). When the recovery conversion valve (26) is closed, the resin solution flows into the collision dummy skin layer mold. When the recycling is completed, close the recycling conversion valve (26), open the vacuum valve (10), turn on the vacuum machine (12), maintain the vacuum degree of 0.01 bar in the vacuum barrel (9) according to the reading of the vacuum gauge, and close the vacuum machine (12) and the vacuum valve (10) after no bubbles float on the liquid surface, open the lid of the vacuum barrel (9), take out the liquid collection barrel, and pour the resin solution after defoaming back into the resin constant temperature barrel (17).

3. The perfusion device according to claim 1, characterized in that Also includes: A perfusion horizontal support (6) for supporting the crash dummy skin layer mold; Liquid level measuring tube (27), drain valve (27a) and anhydrous ethanol recovery tank (28).

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