A continuous vacuum casting system for composite solid propellant

Abstract

A kind of composite solid propellant continuous vacuum casting system, including double screw extruder, material distributing device, shell conveying device and shell positioning sealing device;Shell conveying device is at least two, and is side by side and is arranged in the discharge port side of double screw extruder;Shell positioning sealing device is multiple, multiple shell positioning sealing device and shell conveying device one to one correspond;Each shell positioning sealing device includes tray, sealing cover, positioning device and shell lifting device for driving tray lifting;Shell lifting device is arranged in the middle of shell conveying device, and sealing cover is arranged above shell lifting device;Double screw extruder and the sealing cover of each shell positioning sealing device are connected by material distributing device.Not only can realize the continuous charging of composite propellant, but also can reduce the loss of material in different stations during the manufacture of composite solid propellant, reduce cost loss while reducing safety risk, improve charging efficiency.

Description

Technical Field

[0001] This utility model relates to the field of composite solid propellant casting technology, specifically a continuous vacuum casting system for composite solid propellants. Background Technology

[0002] In the field of composite solid propellant manufacturing, propellant grain casting is a crucial core process determining product uniformity, structural integrity, and performance consistency. However, a typical technical contradiction that has existed in this field for decades has remained unresolved: the continuous advancement of mixing technology versus the intermittent stagnation of the casting process. Traditional intermittent vacuum casting processes, due to batch operations, extensive manual intervention, and large environmental fluctuations, result in low production efficiency, poor consistency, and high defect risks, failing to meet the stringent requirements of modern aerospace for high-performance and high-reliability propellants. Although the emergence of continuous mixing and delivery technology based on tensile deformation has successfully achieved continuous propellant mixing and degassing, the matching downstream continuous casting technology has long been lacking, resulting in a process disconnect where "mixing is continuous, but casting remains intermittent." Currently, there is no effective solution for continuous casting. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a continuous vacuum casting system for composite solid propellants, which adds a series of device systems at the end of continuous mixing to achieve continuous vacuum casting of composite solid propellants.

[0004] To solve the above problems, this utility model is achieved through the following technical solution:

[0005] A continuous vacuum casting system for composite solid propellants includes a twin-screw extruder, a material distribution device, a shell conveying device, and a shell positioning and sealing device;

[0006] The shell conveying device is at least two, and is arranged side by side on one side of the discharge port of the twin-screw extruder;

[0007] There are multiple shell positioning and sealing devices, and each shell positioning and sealing device corresponds to a shell conveying device; each shell positioning and sealing device includes a tray, a sealing cover, a positioning device, and a shell lifting device that drives the tray to rise and fall.

[0008] The shell lifting device is located in the middle of the shell conveying device, and the sealing cover is located above the shell lifting device;

[0009] The twin-screw extruder and the sealing caps of each of the housing positioning and sealing devices are connected by a material distribution device.

[0010] The material distribution device includes a main material distribution pipe and multiple branch material distribution pipes. One end of the main material distribution pipe is connected to the discharge port of the twin-screw extruder, and the other end is connected to multiple branch material distribution pipes. Each branch material distribution pipe corresponds to a housing positioning and sealing device and is connected to the sealing cover of the housing positioning and sealing device.

[0011] The main material distribution pipe is covered with an insulation jacket, and each of the branch material distribution pipes is equipped with a material distribution valve and a flow sensor.

[0012] The sealing cover is a stepped cylinder composed of a large disc and a small cylinder. The small cylinder has a through hole inside, which fits with the outer diameter of the shell with a small clearance. The inner wall of the through hole has an annular groove on the side near the large disc. A sealing ring made of heat-resistant and corrosion-resistant material is embedded in the annular groove. Vacuum pumping and vacuum release components are embedded in the round holes on both sides of the top of the large disc. The large disc has a feeding channel. One end of the feeding channel is connected to the through hole in the middle of the small cylinder, and the other end extends to the outer wall of the large disc and is fitted with a pipe joint. One end of the pipe joint is connected to the distribution branch pipe of the distribution device, and the other end is connected to the through hole of the small cylinder.

[0013] The shell lifting device includes a lifting platform and a hydraulic drive device for driving the lifting platform to rise and fall. The conveyor belt of the shell conveying device has a notch in the middle to allow the lifting platform to move.

[0014] The lifting platform is equipped with a weight sensor that can be used for weighing.

[0015] The shell conveying device uses an explosion-proof roller with an antistatic coating.

[0016] The positioning device includes a positioning sensor, a liftable hydraulic baffle, and a hydraulic lifting drive device. The positioning sensor is located on the housing conveying device frame on one side of the housing lifting device, and the hydraulic lifting drive device is used to drive the hydraulic baffle to rise and fall.

[0017] It also includes a controller for collecting signals from positioning sensors, flow sensors, and weight sensors, and controlling the actions of the material distribution valve, the shell conveying device, the shell lifting device, and the hydraulic baffle. The controller input is connected to the positioning sensor, flow sensor, and weight sensor via signal lines, and the controller output is electrically connected to the hydraulic drive device and hydraulic lifting drive device of the material distribution valve, the shell conveying device, and the shell lifting device.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] Before pouring, this invention prepares the shell using a shell conveying device and a shell lifting device, and evacuates it through a sealed cover. By intermittently opening the feed valve, multiple outlets in the discharge pipe alternately pour the composite solid propellant into the pre-prepared vacuum shell, thereby achieving continuous discharge of the composite solid propellant. High-precision control of the pouring amount is achieved through dynamic control using flow sensor signals at the front end of the pouring port and weight sensor signals fed back from the bottom of the lifting platform.

[0020] This continuous vacuum casting system for composite solid propellants maintains the material in a vacuum environment throughout the solid propellant discharge and vacuum casting process. The online continuous transportation of materials reduces cost losses, lowers safety risks, and improves loading efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of a twin-screw extruder.

[0023] Figure 3 This is a schematic diagram of the discharge pipe of this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the sealing cover of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the shell conveying device and the shell lifting device of this utility model;

[0026] In the diagram: 1 Twin-screw extruder, 10 Base, 11 Main motor, 12 Gearbox, 13 Hopper, 14 Screw assembly, 15 Degassing device, 16 Discharge port, 2 Material distribution device, 20 Material distribution main pipe, 21 Insulation jacket, 22 Material distribution valve one, 23 Material distribution valve two, 24 Flow sensor, 25 Material distribution branch pipe, 3 Sealing cover, 30 Cover feed pipe, 31 Vacuum assembly, 32 Vacuum release assembly, 33 Sealing ring, 4 Shell conveying device, 41 Pallet, 42 Shell, 43 Positioning sensor, 44 Hydraulic baffle, 5 Shell lifting device. Detailed Implementation

[0027] The present invention will be further explained in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1As shown, a continuous vacuum casting system for composite solid propellants includes a twin-screw extruder 1, a material distribution device 2, a shell conveying device 4, and a shell positioning and sealing device composed of a shell lifting device 5, a positioning device, and a sealing cover 3. Two shell conveying devices 4 are arranged side-by-side on one side of the discharge port 16 of the continuous mixing extruder 1. The shell positioning and sealing device corresponds one-to-one with the two shell conveying devices 4. The shell lifting device 5 is located in the middle of the shell conveying line 4, and the sealing cover 3 is located above the shell lifting device 5. The continuous mixing extruder 1 and the sealing covers 3 of each of the shell positioning and sealing devices are connected through the material distribution device 2.

[0029] like Figure 2 As shown, the main unit of the twin-screw extruder 1 is mounted on the base 10. Initial raw material enters the twin-screw extruder 1 from the feed hopper 13. The main motor 11 of the twin-screw extruder 1 drives the screw assembly 14 of the twin-screw extruder 1 to move through the gearbox 12. The degassing device 15 draws a vacuum to remove air bubbles from the material. After stretching, mixing and degassing, the material is extruded from the discharge port 16.

[0030] like Figure 3 As shown, the material distribution device 2 includes a main material distribution pipe 20 and two branch material distribution pipes 25. One end of the main material distribution pipe 20 is connected to the outlet 16 of the continuous mixing extruder 1, and the other end is connected to the two branch material distribution pipes 25 through a three-way valve. The multiple branch material distribution pipes 25 correspond one-to-one with each housing positioning and sealing device and are connected to the sealing cover 3 of the housing positioning and sealing device.

[0031] The outer wall of the distribution pipe is equipped with an insulation jacket 21. The pipe contains a three-way distribution valve, which, together with the distribution valve 1 22 and the distribution device 2 23, enables the two pipes to continuously and alternately discharge materials. Each distribution branch pipe 25 is equipped with a flow sensor 24 to control and measure the discharge amount to achieve precise casting of the shell. Each distribution branch pipe 25 is connected to the pipe joint 30.

[0032] like Figure 4 As shown, the sealing cover 3 is a stepped cylinder composed of a large disc and a small cylinder. The small cylinder has a through hole hollowed out inside, which fits with the outer diameter of the housing 42 with a small clearance. An annular groove is provided on the inner wall of the through hole near the large disc, and a sealing ring 33 made of heat-resistant and corrosion-resistant material is embedded in the annular groove. The inner diameter of the sealing ring 33 is slightly smaller than the inner diameter of the housing. Vacuum pumping component 31 and vacuum release component 32 are embedded in the circular holes on both sides of the top of the large disc. A feeding channel is provided inside the large disc. One end of the feeding channel is connected to the through hole in the middle of the small cylinder, and the other end extends to the outer wall of the large disc and is fitted with a pipe connector 30. One end of the pipe connector 30 is connected to the feeding branch pipe 25 of the feeding device 2, and the other end is connected to the through hole of the small cylinder. Different sizes of covers can be used to adapt to different models of engine housings. The housing is inserted into the inner through hole of the small cylinder of the cover by a lifting device, and the elastic sealing ring 33 in the inner hole is pressed to achieve a sealed environment.

[0033] like Figure 5 As shown, the shell conveying device 4 uses a roller conveyor line. The shell lifting device 5 includes a lifting platform and a hydraulic drive device for driving the lifting platform up and down. The conveyor belt of the shell conveying device 4 has a notch in the middle to accommodate the lifting platform. The positioning device includes a positioning sensor 43, a liftable hydraulic baffle 44, and a hydraulic lifting drive device. The positioning sensor 43 is mounted on the frame of the shell conveying device 4 on one side of the shell lifting device 5. The hydraulic lifting drive device is used to drive the hydraulic baffle 44 up and down. The hydraulic drive device and the hydraulic lifting drive device can be hydraulic cylinders.

[0034] Before pouring, prepare the shell 42. The shell conveying device 4 drives the pallet 41 to move. The surface of the pallet 41 and the conveyor belt is covered with an anti-static layer. When the shell 42 is transported to the predetermined position with the pallet 41, it will be detected by the positioning sensor 43. At this time, the hydraulic baffle 44 is raised, the shell conveying device 4 stops, and the shell stays in the designated position.

[0035] The shell lifting device 5 is located directly below the sealing cover 3. The shell lifting device 5 drives the tray to rise, and the shell aligns with the sealing cover, ready for pouring. During pouring, the shells on another conveyor line can be prepared simultaneously. The shell preparation cycle is shorter than the pouring time. After pouring, switching the discharge port achieves continuous vacuum discharge. After the shell is poured, the rear vacuum component 32 releases the vacuum, and the shell 42 is lowered by the shell lifting device 5 and placed on the shell conveying device 4.

[0036] In addition, the continuous vacuum casting system also includes a controller (PLC / microcontroller / industrial computer) for collecting signals from the positioning sensor 43, flow sensor 24, and weight sensor, and controlling the operation of the material distribution valve, shell conveying device 4, shell lifting device 5, and hydraulic baffle 44. The controller input is connected to the positioning sensor 43, flow sensor 24, and weight sensor via signal lines, and the controller output is electrically connected to the hydraulic drive devices and hydraulic lifting drive devices of the material distribution valve, shell conveying device 4, and shell lifting device 5. Collecting sensor signals through the controller and controlling the motor of the material distribution valve, shell conveying device 4, and the hydraulic drive device and hydraulic lifting drive device of the shell lifting device 5 are existing conventional technologies and are not the focus of this application; therefore, this embodiment will not elaborate further.

[0037] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A continuous vacuum casting system for composite solid propellants, characterized in that: It includes a twin-screw extruder (1), a material distribution device (2), a shell conveying device (4), and a shell positioning and sealing device; The shell conveying device (4) is at least two and is arranged side by side on one side of the discharge port (16) of the twin-screw extruder (1); There are multiple housing positioning and sealing devices, and each housing positioning and sealing device corresponds to the housing conveying device (4) one by one; each housing positioning and sealing device includes a tray (41), a sealing cover (3), a positioning device, and a housing lifting device (5) that drives the tray (41) to rise and fall. The shell lifting device (5) is located in the middle of the shell conveying device (4), and the sealing cover (3) is located above the shell lifting device (5); The twin-screw extruder (1) and the sealing caps (3) of each of the housing positioning and sealing devices are connected by a material distribution device (2).

2. The continuous vacuum casting system for composite solid propellants according to claim 1, characterized in that: The material distribution device (2) includes a main material distribution pipe (20) and multiple material distribution branch pipes (25). One end of the main material distribution pipe (20) is connected to the discharge port (16) of the twin-screw extruder (1), and the other end is connected to multiple material distribution branch pipes (25). The multiple material distribution branch pipes (25) correspond one-to-one with each housing positioning and sealing device and are connected to the sealing cover (3) of the housing positioning and sealing device.

3. The continuous vacuum casting system for composite solid propellants according to claim 2, characterized in that: The main material distribution pipe (20) is covered with an insulation jacket (21), and each of the branch material distribution pipes (25) is equipped with a material distribution valve and a flow sensor (24).

4. The continuous vacuum casting system for composite solid propellants according to claim 1, characterized in that: The sealing cover (3) is a stepped cylinder composed of a large disc and a small cylinder. The small cylinder has a through hole inside, which is fitted with a small clearance to the outer diameter of the shell (42). The inner wall of the through hole is provided with an annular groove on the side near the large disc. A sealing ring (33) made of heat-resistant and corrosion-resistant material is embedded in the annular groove. Vacuum pumping component (31) and vacuum release component (32) are embedded in the round holes on both sides of the top of the large disc. A feeding channel is provided inside the large disc. One end of the feeding channel is connected to the through hole in the middle of the small cylinder, and the other end extends to the outer wall of the large disc and is fitted with a pipe joint (30). One end of the pipe joint (30) is connected to the feeding branch pipe (25) of the feeding device (2), and the other end is connected to the through hole of the small cylinder.

5. The continuous vacuum casting system for composite solid propellants according to claim 1, characterized in that: The shell lifting device (5) includes a lifting platform and a hydraulic drive device for driving the lifting platform to lift. The conveying belt of the shell conveying device (4) has a notch in the middle to allow the lifting platform to move.

6. The continuous vacuum casting system for composite solid propellants according to claim 5, characterized in that: The lifting platform is equipped with a weight sensor that can be used for weighing.

7. The continuous vacuum casting system for composite solid propellants according to claim 1, characterized in that: The shell conveying device (4) uses an explosion-proof roller with an antistatic coating on its surface.

8. The continuous vacuum casting system for composite solid propellants according to claim 1, characterized in that: The positioning device includes a positioning sensor (43), a liftable hydraulic baffle (44), and a hydraulic lifting drive device. The positioning sensor (43) is located on the frame of the housing conveying device (4) on one side of the housing lifting device (5), and the hydraulic lifting drive device is used to drive the hydraulic baffle (44) to rise and fall.

9. A continuous vacuum casting system for composite solid propellants according to any one of claims 1-8, characterized in that: It also includes a controller for collecting signals from the positioning sensor (43), flow sensor (24), and weight sensor, and controlling the actions of the material distribution valve, the shell conveying device (4), the shell lifting device (5), and the hydraulic baffle (44). The input end of the controller is connected to the positioning sensor (43), the flow sensor (24), and the weight sensor via signal lines, and the output end of the controller is electrically connected to the hydraulic drive device and the hydraulic lifting drive device of the material distribution valve, the shell conveying device (4), and the shell lifting device (5).

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