A steam pipe for making a vehicle underbody shield

Abstract

The application relates to the field of automobile parts, and discloses a steam pipeline for manufacturing a vehicle body bottom protection plate, which comprises a main pipeline, a branch pipeline connected with one end of the main pipeline, a corrugated compensator arranged at the connection position of the main pipeline and the branch pipeline, and a multi-station adjustable monitoring module with a detection end extending into the pipeline, and a pipeline support for fixing the pipeline. High-temperature and high-pressure steam generated by a steam generator enters the device through the main pipeline. According to preset process parameters, a servo motor of a staged adjusting valve group is controlled by a separate PLC control cabinet, the steam conveying amount of each branch pipeline is adjusted, parameters of key positions of the pipeline are collected in real time by the multi-station adjustable monitoring module, signals are transmitted to the PLC control cabinet, and if the parameters exceed a threshold value, the PLC immediately drives an adjusting valve to correct.

Description

Technical Field

[0001] This application relates to the field of automotive parts technology, and in particular to a steam pipe for the manufacture of vehicle body underbody protection panels. Background Technology

[0002] In the injection molding or compression molding process of the vehicle body underbody protection plate, steam, as the core heat medium, needs to maintain stable pressure, temperature (160-220℃) and flow rate at different process stages (preheating, constant temperature molding, pressure holding and cooling). However, traditional steam pipeline systems have multiple technical defects: First, they lack adaptability. The design of a single main pipeline and equal-diameter branch pipelines does not match the differences in heat load at each station. The molding station is prone to steam shortage due to insufficient pipe diameter, while the cooling transition station wastes energy due to excessive pipe diameter. Moreover, the reliance on manual shut-off valves makes it impossible to accurately fine-tune the flow rate, resulting in uneven preheating, molding defects, and a product qualification rate of only about 85%. Second, they have poor protective performance and lack targeted protection against thermal deformation and vibration. Utility Model Content

[0003] To address the above problems, this application provides a steam pipe for manufacturing vehicle underbody protection plates.

[0004] This application provides a steam pipe for manufacturing vehicle underbody protection panels, which adopts the following technical solution: A steam pipe for manufacturing vehicle underbody protection panels, characterized in that it includes: Main pipeline; Branch pipes, multiple branch pipes are connected to one end of the main pipe, including branch pipe one, branch pipe two and branch pipe three, which correspond to the preheating station, forming station and cooling transition station of the bottom protective plate, respectively; A corrugated compensator is installed at the connection between the main pipeline and the branch pipeline; The multi-position adjustable monitoring module includes a pressure sensor, a temperature sensor, and a flow sensor. The sensors are detachably mounted at key locations on the main pipeline and / or the branch pipeline via mounting brackets, and their detection ends extend into the pipeline. Pipe supports are used to secure pipes. The PLC control cabinet is electrically connected to the multi-station adjustable monitoring module.

[0005] Preferably, the main pipe is made of stainless steel with a wall thickness of 5-6mm and is connected to the branch pipe through a four-way connector. The wall thickness of the main pipe is greater than that of the branch pipe, and the wall thicknesses of the first branch pipe, the second branch pipe and the third branch pipe decrease sequentially.

[0006] Preferably, it also includes an electric hard-seal gate valve installed at the inlet of the main pipeline; and three electric sleeve regulating valves, which are respectively installed at the inlets of branch pipeline one, branch pipeline two and branch pipeline three.

[0007] Preferably, it further includes a steam buffer mechanism, which is disposed on the second branch pipe; the steam buffer mechanism includes a buffer pipe communicating with the second branch pipe and a spiral guide vane disposed on the inner wall of the buffer pipe, the inner diameter of the buffer pipe being the same as that of the second branch pipe.

[0008] Preferably, the pressure sensor is installed at the inlet of the main pipeline and the outlet of the branch pipeline, with its probe extending into the pipeline to a depth of one-third of the pipe diameter, for monitoring steam pressure.

[0009] Preferably, the temperature sensor is installed at the inlet of branch pipe two and / or the buffer pipe, and its probe end is an insertion type, perpendicular to the pipe axis, for monitoring steam temperature.

[0010] Preferably, two flow sensors are provided, which are respectively installed on the main pipe (2) and the branch pipe 2, for monitoring steam flow.

[0011] Preferably, the mounting bracket includes a fixing ring and a sensor holder. The fixing ring is a two-part structure and is fixed to the outer wall of the pipe by bolts. The sensor holder is disposed on the fixing ring, and the sensor is installed in the sensor holder.

[0012] Preferably, the pipe support is an inverted concave steel support, which is connected to the pipe by a clamp, and a silicone shock-absorbing pad is provided between the pipe and the clamp.

[0013] Preferably, it also includes a steam generator, the output end of which is connected via a flange to the end of the main pipe away from the branch pipe, for generating steam.

[0014] In summary, this application includes the following beneficial technical effects: The high-temperature, high-pressure steam generated by the steam generator enters the unit through the main pipeline. The independent PLC control cabinet adjusts the steam delivery volume of each branch pipeline by controlling the servo motor of the graded regulating valve group according to the preset process parameters (pressure, temperature, and flow thresholds for different workstations). The multi-workstation adjustable monitoring module collects parameters of key pipeline positions in real time and transmits the signals to the PLC control cabinet. If the parameters exceed the threshold, the PLC immediately drives the regulating valve to correct and issues a warning through the cabinet alarm component. The vibration damping support system ensures the structural stability of the pipeline during steam delivery through vibration damping pads and thermal compensators, avoiding the impact of vibration and thermal deformation on parameter stability. At the same time, the PLC control cabinet transmits real-time parameters to the workshop monitoring screen to achieve visual management. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of an embodiment of the application; Figure 2 This is a schematic diagram of the structure of the two supports in the embodiment of the application; Figure 3 This is a schematic diagram of the steam buffer mechanism in the embodiment of the application.

[0016] Explanation of reference numerals in the attached drawings: 1. Steam generator; 2. Main pipeline; 3. Flange; 4. Branch pipeline one; 5. Branch pipeline two; 6. Branch pipeline three; 7. Four-way connector; 8. PLC control cabinet; 9. Electric hard-seal gate valve; 10. Electric sleeve regulating valve; 11. Steam buffer mechanism; 111. Buffer pipe; 112. Spiral guide vane; 12. Pressure sensor; 13. Temperature sensor; 14. Flow sensor; 15. Mounting bracket; 16. Pipe support. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0018] This application discloses a steam pipe for manufacturing vehicle underbody protection panels, referring to... Figures 1-2 The system includes a main pipeline 2, a steam generator 1, and a steam generator 1. The output end of the main pipeline 2 is connected to the end away from the branch pipeline via a flange 3 to generate steam. The branch pipelines are connected to one end of the main pipeline, including branch pipeline 1 4, branch pipeline 2 5, and branch pipeline 3 6. They are connected to the other end of the main pipeline 2 via a four-way connector 7. Corrugated compensators (compensation range ±50mm, material 304 stainless steel) are provided in four sets and are respectively installed at the connection points of the main pipeline 2, each branch pipeline, and the four-way connector 7 via flanges 3. They absorb the thermal expansion and contraction of the pipeline caused by temperature changes and prevent pipeline deformation or joint leakage. Branch pipeline 1 4, branch pipeline 2 5, and branch pipeline 3 6 correspond to the preheating station, forming station, and cooling transition station of the bottom protective plate, respectively. The main pipeline 2 is made of stainless steel pipe (wall thickness 5-6mm), the wall thickness of branch pipeline 1 4 is 4mm, the wall thickness of branch pipeline 2 5 is 4.5mm, and the wall thickness of branch pipeline 3 6 is 3.5mm.

[0019] Main pipeline 2 meets the total steam flow requirements. Branch pipelines for preheating, forming, and cooling transition stations are adapted to different station heat loads to prevent excessive steam velocity in main pipeline 2 from causing pressure loss and ensure sufficient steam supply to downstream stations.

[0020] The three main branch pipes correspond to the preheating station (branch one, wall thickness 4mm), the forming station (branch two, wall thickness 4.5mm), and the cooling transition station (branch three, wall thickness 3.5mm). The forming station is a key step in the production of the bottom liner, and has the highest requirements for steam volume and pressure stability. Therefore, the largest pipe diameter and thicker pipe wall (4.5mm) are used to ensure sufficient steam and that the pipe can withstand high pressure. The preheating station requires a moderate amount of steam, while the cooling transition station only requires a small amount of steam to maintain the temperature. The differentiated pipe diameter design avoids energy waste caused by using large pipes for small purposes, while matching the heat load of each station to ensure uniform preheating of the bottom plate, stable molding quality, and smooth cooling transition.

[0021] Reference Figure 1 It also includes an electric hard-seal gate valve 9, used for main steam on / off control, with a sealing surface made of hard alloy welded, leakage ≤0.01%, installed at the inlet of main pipe 2; and an electric sleeve regulating valve 10, with a valve core material of 1Cr18Ni9Ti, regulating accuracy ±0.3%, the valve stem is connected to a servo motor (power 100-200W, speed 1500r / min) via a coupling, the coaxiality error between the servo motor output shaft and the valve stem is ≤0.1mm, ensuring precise regulating action, three of which are installed at the inlets of branch pipe 1 4, branch pipe 2 5 and branch pipe 3 6 respectively.

[0022] The electric hard-seal gate valve 9 is installed at the inlet of the main pipeline 2 as the main steam control switch. The electric control method eliminates the need for manual operation, which is suitable for the needs of automated production in the workshop. It can be remotely controlled or linked with the PLC control cabinet 8 to achieve on / off switching, thereby improving operational efficiency.

[0023] Each branch pipe inlet is equipped with an electric sleeve regulating valve 10, which can finely adjust the steam volume according to the real-time needs of each station (such as increasing the flow rate when the preheating station needs to be heated, and decreasing the flow rate when the cooling transition station needs to control the temperature), so as to avoid quality problems such as uneven preheating and molding cracks in the bottom guard plate due to fluctuations in steam parameters.

[0024] The multi-station adjustable monitoring module includes a pressure sensor 12, a temperature sensor 13, and a flow sensor 14. The sensors are detachably fixed to key positions on the main pipeline and / or the branch pipelines via mounting brackets 15. The probes extend into the pipeline. Four pressure sensors 12 (measuring range 0-2MPa, accuracy 0.1) are installed at the inlet of the main pipeline 2 and the outlet of the regulating valve of each branch pipeline. The probes extend into one-third of the pipeline diameter to monitor the total steam pressure, ensuring that the source pressure meets the standard. The branch outlets monitor the pressure after adjustment to verify whether the regulating valve action is accurate, avoiding damage to the mold due to excessive pressure or affecting efficiency due to excessively low pressure.

[0025] Temperature sensor 13 (measuring range -50-300℃, accuracy Class A) is installed at the inlet of branch pipe 2 5 and / or buffer pipe 111. The probe end is an insertion type (length 50-80mm), perpendicular to the pipe axis, and can directly contact the steam to accurately monitor the steam temperature entering the molding die (molding temperature is crucial to the quality of the bottom guard plate) and avoid molding failure due to temperature deviation.

[0026] Two flow sensors 14 (measuring range 10-100 m³ / h, accuracy 0.5) are installed on the main pipe 2 and the branch pipe 2 5 respectively. The flow monitoring of the main pipe 2 ensures that the total supply is sufficient, while the flow monitoring of the branch pipe 2 5 provides data for flow adjustment at the forming station, realizing on-demand supply.

[0027] Reference Figure 2 The mounting bracket 15 includes a fixing ring (made of Q235 steel, with an inner diameter matching the pipe), a two-part structure, which is clamped and fixed to the outer wall of the pipe by two M8 bolts with a bolt torque of 5-8 N·m. The sensor holder is set on the fixing ring, and the sensor is installed in the sensor holder.

[0028] The bracket adopts a two-half fixing ring and sensor holder structure. The fixing ring is clamped to the outer wall of the pipe by two bolts, eliminating the need for welding or drilling on the pipe and avoiding damage to the pipe integrity (preventing leakage). The sensor holder can be adapted to different models of sensors, making installation and disassembly convenient. Sensors can be replaced without disassembling the pipe during later maintenance, reducing maintenance costs and downtime.

[0029] Pipe support 16 (made of Q235 steel, hot-dip galvanized), with a support spacing of 2-2.5m, is fixed to the ground with bolts and has a load-bearing capacity of ≥50kg. It is connected to pipe support 16 by clamps (made of 304 stainless steel, with an inner diameter matching the pipe). Pipe support 16 adopts an inverted concave steel support. A silicone shock-absorbing pad (5mm thick, hardness 50 Shore A) is installed between the pipe and the clamp on pipe support 16. The shock-absorbing pad is bonded to the pipe and clamp with high-temperature resistant adhesive (temperature resistance ≥250℃) to reduce the vibration amplitude of the pipe.

[0030] Pipe support 16 adopts an inverted concave steel support, which is fixed to the ground with bolts. The structure is stable and can bear the total weight of the pipe and steam, preventing the pipe from sagging due to its own weight and causing uneven stress on the joints. Silicone shock-absorbing pads are installed between the pipe and the clamp, and the shock-absorbing pads are bonded to the pipe and clamp with high-temperature resistant adhesive. When steam flows, it will generate a certain amount of vibration. The shock-absorbing pads can effectively absorb the vibration energy and reduce the vibration amplitude of the pipe. On the one hand, it can prevent the pipe joints from loosening and the weld from cracking due to long-term vibration. On the other hand, it can reduce vibration noise and improve the working environment of the workshop. At the same time, the silicone material is resistant to high temperature and will not age and fail due to high temperature steam.

[0031] Reference Figure 3 It also includes a steam buffer mechanism 11, which is installed on the second branch pipe 5. The steam buffer mechanism 11 includes a buffer pipe 111 (300-400mm in length) connected to the second branch pipe and a spiral guide vane installed on the inner wall of the buffer pipe. The inner diameter of the buffer pipe is the same as that of the second branch pipe 5. There are multiple sets of spiral guide vanes 112 (lead 100-120mm, angle with the pipe axis 35°-40°) welded inside the buffer pipe 111. The spiral guide reduces steam turbulence and makes the outlet steam velocity fluctuation ≤±1.5m / s, ensuring uniform heating of the mold.

[0032] The PLC control cabinet 8 is fixed to a special base on the workshop floor with bolts. The cabinet can integrate the control signals of all electric valves (gate valves, regulating valves) and the monitoring data of each sensor. On the one hand, it realizes data visualization, and the staff can view the steam pressure, temperature and flow in real time through the cabinet panel without having to check the sensors one by one on site, thus improving monitoring efficiency. On the other hand, it realizes automated linkage.

[0033] The implementation principle of a steam pipe for manufacturing a vehicle body underbody protection plate according to an embodiment of this application is as follows: When in use, start the steam generator 1, set the steam temperature (usually 120-160℃ according to process requirements), and after the steam pressure in the generator reaches the set value, the electric hard seal gate valve 9 is automatically opened to 100% opening degree by the PLC, and the steam is delivered to the four-way connector 7 through the main pipe 2. The pressure sensor 12 of the main pipeline 2 transmits pressure data to the PLC in real time. If the pressure is lower than the set value (e.g., ≤0.35MPa), the PLC automatically controls the steam generator 1 to increase the heating power. If the pressure is higher than the set value (e.g., ≥0.65MPa), the PLC controls the generator to reduce the power to maintain the steam pressure of the main pipeline 2.

[0034] Branch pipeline workstation adaptation supply: According to the bottom liner production process, the PLC, in the sequence of preheating station → forming station → cooling transition station, links the regulating valves and sensors of the corresponding branch pipelines to achieve staged steam supply: Preheating station (branch pipe 14): After the bottom guard plate blank enters the preheating mold, the PLC controls the electric sleeve regulating valve 10 of branch 1 to open to the set opening degree (usually 60-70%). Steam enters the preheating mold, and the pressure sensor 12 of the preheating station monitors the outlet pressure (maintained at 0.3-0.4MPa). If the pressure fluctuates, the PLC finely adjusts the valve opening in real time to ensure that the blank is preheated to 80-100℃ evenly (indirectly fed back through the mold temperature) to avoid local overheating or insufficient preheating.

[0035] Forming station (branch pipe 2 5): After the preheated billet is transferred to the forming mold, the PLC controls the regulating valve of branch 2 to open to 80-90% of its opening. The steam enters the forming mold after being processed by the steam buffer mechanism 11 (the spiral guide vane 112 reduces the flow rate and the buffer pipe 111 stabilizes the pressure). The temperature sensor 13 monitors the inlet temperature of the buffer pipe 111 in real time (maintaining 140-160℃), and the flow sensor 14 monitors the flow rate of branch 2 (ensuring that the hourly flow rate meets the forming energy consumption requirements). If the temperature is too low, the PLC increases the opening of the regulating valve; if the flow rate exceeds the standard, the opening is reduced to ensure that the steam in the mold is evenly distributed, so that the bottom guard plate is formed according to the set shape (forming time is usually 3-5 minutes).

[0036] Cooling transition station (branch pipe 3 6): The formed bottom plate is transferred to the cooling transition mold. The PLC controls the regulating valve of branch 3 to open to 20-30% of its opening, and a small amount of steam is introduced to maintain the mold temperature at 50-60℃ (to prevent the bottom plate from shrinking and deforming due to sudden cooling). The pressure sensor 12 of the cooling transition station monitors the outlet pressure (maintained at 0.1-0.2MPa). The PLC fine-tunes the valve according to the mold temperature feedback to ensure that the bottom plate cools slowly to room temperature.

[0037] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A steam pipe for manufacturing vehicle underbody protection panels, characterized in that, include: Main pipeline (2); Branch pipes, multiple branch pipes are connected to one end of the main pipe (2), including branch pipe one (4), branch pipe two (5) and branch pipe three (6), which correspond to the preheating station, forming station and cooling transition station of the bottom guard plate, respectively; A corrugated compensator is installed at the connection between the main pipeline (2) and the branch pipeline; The multi-position adjustable monitoring module includes a pressure sensor (12), a temperature sensor (13) and a flow sensor (14). The sensors are detachably installed at key positions on the main pipeline (2) and / or the branch pipeline via mounting brackets (15), and their detection ends extend into the pipeline. Pipe support (16) is used to fix pipes; The PLC control cabinet (8) is electrically connected to the multi-station adjustable monitoring module.

2. A steam pipe for manufacturing vehicle underbody protection plates according to claim 1, characterized in that: The main pipe (2) is made of stainless steel pipe with a wall thickness of 5-6mm and is connected to the branch pipe through a four-way connector (7). The wall thickness of the main pipe (2) is greater than that of the branch pipe, and the wall thicknesses of the first branch pipe (4), the second branch pipe (5) and the third branch pipe (6) decrease sequentially.

3. A steam pipe for manufacturing vehicle underbody protection plates according to claim 1, characterized in that: It also includes an electrically operated hard-seal gate valve (9), installed at the inlet of the main pipeline (2); Three electric sleeve regulating valves (10) are provided and are respectively installed at the inlet of the first branch pipe (4), the second branch pipe (5) and the third branch pipe (6).

4. A steam pipe for manufacturing vehicle underbody protection plates according to claim 1, characterized in that: It also includes a steam buffer mechanism (11), which is disposed on the second branch pipe (5); The steam buffer mechanism (11) includes a buffer pipe (111) connected to the second branch pipe (5) and a spiral guide vane (112) disposed on the inner wall of the buffer pipe (111). The inner diameter of the buffer pipe (111) is the same as that of the second branch pipe (5).

5. A steam pipe for manufacturing vehicle underbody protection plates according to claim 1, characterized in that: The pressure sensor (12) is installed at the inlet of the main pipe (2) and the outlet of the branch pipe, respectively. Its probe extends into the pipe to a depth of one-third of the pipe diameter and is used to monitor the steam pressure.

6. A steam pipe for manufacturing vehicle underbody protection plates according to claim 4, characterized in that: The temperature sensor (13) is installed at the inlet of the branch pipe (5) and / or the buffer pipe (111). Its probe end is inserted and perpendicular to the pipe axis, and is used to monitor the steam temperature.

7. A steam pipe for manufacturing vehicle underbody protection plates according to claim 1, characterized in that: Two flow sensors (14) are provided, which are installed on the main pipe (2) and the second branch pipe (5) respectively, for monitoring steam flow.

8. A steam pipe for manufacturing a vehicle underbody protection plate according to claim 1, characterized in that: The mounting bracket (15) includes a fixing ring and a sensor holder. The fixing ring is a two-part structure and is fixed to the outer wall of the pipe by bolts. The sensor holder is set on the fixing ring and the sensor is installed in the sensor holder.

9. A steam pipe for manufacturing vehicle underbody protection plates according to claim 1, characterized in that: The pipe support (16) is an inverted concave steel support, which is connected to the pipe by a clamp, and a silicone shock-absorbing pad is provided between the pipe and the clamp.

10. A steam pipe for manufacturing a vehicle underbody protection plate according to claim 1, characterized in that: It also includes a steam generator (1), the output end of which is connected to the end of the main pipe (2) away from the branch pipe via a flange (3) for generating steam.

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