Test platform in vacuum cabin

Abstract

The invention relates to a test platform in a vacuum cabin, belongs to the technical field of aerospace liquid attitude and orbit control engine test, solves the technical problems of low bearing capacity and poor flexibility of the test platform, and comprises a basic platform, a frame structure and a moving mechanism which are sequentially connected from bottom to top. The foundation platform is fixed to a foundation and comprises a platform face, supporting stand columns, connecting pipes, corrugated pipes, base plates and foundation bolts. The frame structure is installed above the foundation platform, fixedly connected with the foundation platform through bolts and used for transmitting thrust of the engine to the foundation platform and supporting the engine to a certain height. The moving mechanism comprises a fixed guide rail, a guiding guide rail, a moving trolley, a sliding block, a steel ball and a bolt and is used for installing the thrust measuring device and the engine. The device is used for the high-altitude simulation test of the aerospace liquid attitude and orbit control engine.

Description

Technical Field

[0001] The invention belongs to the technical field of aerospace liquid attitude and orbit control engine testing, and in particular relates to a vacuum chamber test platform. Background Art

[0002] In the field of high-altitude simulation tests of aerospace liquid attitude and orbit control engines, on the one hand, most of the test platforms inside the vacuum cabin currently use the vacuum cabin as the load-bearing foundation, and the thrust generated by the engine ignition is transmitted to the vacuum cabin through the test platform. This structural form is suitable for small-thrust engines. For large-thrust engines, it will cause excessive stress at the connection between the test platform and the vacuum cabin, causing local deformation or even damage to the vacuum cabin, and the stability of the test platform is difficult to guarantee. On the other hand, most of the test platforms inside the vacuum cabin are currently fixed in form, occupying more space inside the vacuum cabin, and are only suitable for attitude and orbit control thrust chamber tests or small attitude and orbit control whole machine tests, with poor scalability. Summary of the invention

[0003] In order to overcome the shortcomings of low load-bearing capacity and poor flexibility of traditional test platforms, the present invention proposes a vacuum chamber test platform.

[0004] The technical solution adopted by the present invention to solve the technical problem is:

[0005] A vacuum chamber test platform comprises a basic platform, a frame structure and a moving mechanism.

[0006] The basic platform, the frame structure and the moving mechanism are connected in sequence from bottom to top, and the basic platform is fixed on the foundation.

[0007] The basic platform includes a table top, a supporting column, a connecting pipe, a bellows, a pad, and anchor bolts arranged in the vacuum chamber. The supporting column is located below the table top, passes through the through-cabin interface of the vacuum chamber, and is fixedly connected to the table top at the upper end and fixedly connected to the pad at the lower end. The bellows is sleeved on the outside of the supporting column. The pad includes a base plate and a connecting ring. The connecting ring is located at the center position above the base plate, sleeved on the outside of the supporting column, the bottom of the connecting ring is welded to the base plate, and the top is welded to the bellows. The base plate is fixed to the foundation by anchor bolts. The connecting pipe is a cylindrical structure, sleeved on the outside of the supporting column, the bottom is welded to the bellows, the top is flange-connected to the through-cabin interface of the vacuum chamber, and is sealed with a rubber ring.

[0008] The frame structure is installed on the base platform and is detachably connected to the base platform, and is used to transmit the engine thrust to the base platform and support the engine to a certain height.

[0009] The mobile mechanism includes a fixed rail, a guide rail, a mobile trolley, a slider, a steel ball, and a bolt. The mobile mechanism is used to install a thrust measuring device and an engine. The fixed rail and the guide rail are installed on the frame structure and are detachably connected to the frame structure. The fixed rail is used to fix the mobile trolley, and the guide rail is used to guide the movement of the mobile trolley. The mobile trolley is located above the fixed rail and the guide rail, and is bolted to the mobile trolley. The mobile trolley locks the fixed rail and the mobile trolley with the bolts. The slider is fixed to the mobile trolley and cooperates with the guide rail. The steel ball is located between the slider and the guide rail, and the mobile trolley can move along the guide rail. The surface of the mobile trolley is symmetrically provided with an opening area along the axis. The opening area is used for the propellant recovery pipeline to pass through.

[0010] The vacuum chamber test platform has 8 support columns, which are evenly distributed in two rows and four columns below the table. The support columns are hollow circular tubes with a specification of φ80×20. The upper ends of the support columns are welded to the table, and the lower ends are welded to the pad.

[0011] The above vacuum chamber test platform has an M36 anchor bolt, which is locked with double nuts, and an inner diameter of the connecting ring is 100 mm.

[0012] The bottom plate of the vacuum chamber test platform has a size of 120 mm×120 mm and a thickness of 30 mm. Through holes with a diameter of 40 mm are provided at the four corners of the bottom plate, and anchor bolts pass through the through holes to fix the bottom plate on the foundation.

[0013] In the above-mentioned vacuum chamber test platform, the rubber ring between the connecting pipe and the chamber penetration interface is an O-type rubber ring.

[0014] The specification of the bellows in the above vacuum chamber test platform is DN100.

[0015] The frame structure of the vacuum chamber test platform is formed by welding 100mm×100mm stainless steel square tubes, with an axial length of 5.5m and a width of 3m along the chamber body.

[0016] The above vacuum chamber test platform has two fixed rails and two guide rails. The fixed rail is in the form of a T-slot, and the bolts match the T-slot structure.

[0017] A semicircular groove is arranged in the middle of the upper surface of the guide rail, and a steel ball is placed in the groove. Baffles are arranged at both ends of the groove of the guide rail to prevent the steel ball from falling out of the groove. The steel ball is made of 9Cr18 stainless steel and is plated with molybdenum disulfide.

[0018] The above-mentioned vacuum chamber test platform, the moving vehicle is 3m long and 1.5m wide.

[0019] The moving mechanism (3) also includes a motor for driving the moving trolley (33) to move, and a remote controller for controlling the motor to move. The explosion-proof grade of the motor of the moving trolley is ExdIIBT4, and it can move under vacuum. The remote controller has the functions of opening, closing, moving forward, moving backward, fast, slow, emergency stop, and inching. The fast gear speed is 20mm / s to 50mm / s, and the slow gear speed is 0.5mm / s to 3mm / s, which can realize the fast movement and fine adjustment of the moving trolley.

[0020] A proximity switch is respectively arranged at the extreme positions at both ends of the guide rail. When the mobile trolley moves to a position 5 mm away from the proximity switch, the proximity switch is triggered to stop the mobile trolley from moving.

[0021] A knob is provided on the side of the mobile trolley, which has two gears: locking and free. When the mobile trolley is locked with the fixed rail, the knob is placed in the locking gear to shield the remote control. When the mobile trolley is disengaged from the fixed rail, the knob is placed in the free gear, and the remote control can control the mobile trolley normally. Two opening areas are symmetrically provided on the surface of the mobile trolley along the axis, and the length of the opening area is 546mm and the width is 355mm.

[0022] The above-mentioned vacuum chamber test platform, the moving mechanism also includes a rotating handle connected to the moving trolley, which is used to control the movement of the moving trolley.

[0023] The beneficial effects of the present invention are:

[0024] A test platform in a vacuum chamber, the supporting columns pass through the through-chamber interface of the vacuum chamber and are fixed to the foundation, and the test platform and the vacuum chamber are flexibly connected by a bellows. This structural method not only ensures the sealing under vacuum, but also makes the test platform and the load-bearing foundation of the vacuum chamber independent, and they do not affect each other during the test. The thrust of the engine is directly transmitted to the civil foundation through the test platform, and the test platform can withstand a large load.

[0025] A vacuum chamber test platform, the frame structure and the base platform, the frame structure and the mobile mechanism are connected by bolts, the frame structure and the mobile mechanism can be removed from the vacuum chamber and reinstalled, which enhances the space expandability of the vacuum chamber. After the frame structure and the mobile mechanism are removed, the space in the vacuum chamber is larger, and tests with large space requirements such as attitude and orbit control whole machine tests and complex environment tests can be carried out.

[0026] A test platform in a vacuum chamber, the guide rails are composed of 2 guide rails and 2 fixed rails, the guide rails are used to guide the movement of the mobile trolley. The fixed rails are in the form of T-slots, and there are a row of mounting holes on both sides of the corresponding mobile trolley, and the fixed rails are locked with the mobile trolley by bolts. The movement and locking structure of the mobile trolley allows the mobile trolley to move infinitely along the guide rails and be locked, ensuring that the mobile trolley can be moved to any position within the travel range and fixed, which is conducive to the adjustment of the position of different models of engines in the vacuum chamber.

[0027] A vacuum chamber test platform, the mobile trolley has perfect functions, and the remote control has functions such as forward, backward, fast, slow, emergency stop, and inching operation, which is convenient for the mobile trolley to adjust its position. It also has a manual movement mode, and can work normally during power outages. The mobile trolley has perfect protection functions, and proximity switches are set at both ends of the guide rail to limit the movement range of the mobile trolley and avoid derailment. The knob on the side of the mobile trolley can avoid structural damage caused by accidentally triggering the remote control after the mobile trolley is fixed.

[0028] A vacuum chamber test platform that comprehensively considers the layout of the propellant supply pipeline and recovery pipeline during the test. Two opening areas of 546mm (length) × 355mm (width) are symmetrically opened on the surface of the mobile vehicle along the axis, which facilitates the layout of the propellant recovery pipeline and is conducive to pipeline filling and drainage. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the test platform according to an embodiment of the present invention;

[0030] Figure 2 It is a schematic diagram of the basic platform structure of an embodiment of the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of the moving mechanism of an embodiment of the present invention.

[0032] The reference numerals are as follows:

[0033] 1. Basic platform, 2. Frame structure, 3. Moving mechanism, 4. Vacuum chamber;

[0034] 11. Tabletop, 12. Support column, 13. Connecting pipe, 14. Bellows, 15. Pad, 16. Anchor bolt;

[0035] 31. Fixed rail, 32. Guide rail, 33. Moving trolley, 34. Slider, 35. Steel ball, 36. Bolt;

[0036] 41. Heat sink, 42. Diffuser, 43. Engine, 44. Thrust measurement device, 45. Propellant supply pipeline, 46. Propellant recovery pipeline; 47. Cabin penetration interface. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Embodiment 1

[0039] A vacuum chamber test platform, consisting of a basic platform, a frame structure, and a moving mechanism. Figure 1 shown.

[0040] (1) The test platform is placed in a horizontal square vacuum chamber and arranged symmetrically along the axis of the chamber. The test platform has a load capacity of 20t vertically, 150t axially, and 2t laterally.

[0041] (2) The foundation platform consists of a tabletop, supporting columns, pipes, bellows, pads, anchor bolts, etc. Figure 2 As shown, it is the bearing foundation of the entire test platform. The table size is 5.5m (length) × 3m (width), and the upper surface is 0.3m higher than the heat sink at the bottom of the vacuum chamber. The table is in the form of a T-slot, which is convenient for test personnel to install fasteners. The table is made of high-strength carbon steel and is chrome-plated as a whole to enhance corrosion resistance.

[0042] (3) There are 8 supporting columns arranged under the table in two rows and four columns. The supporting columns are hollow circular tubes with a specification of φ80×20. The supporting columns pass through the corresponding through-cabin interface on the vacuum chamber, with one end welded to the table and the other end welded to the bottom plate of the pad.

[0043] (4) The pad consists of a base plate and a connecting ring. The base plate is a square steel plate with a size of 120mm×120mm and a thickness of 30mm. There are through holes with a diameter of 40mm at the four corners of the base plate. An M36 anchor bolt is passed through each through hole and locked with a double nut. The inner diameter of the connecting ring is 100mm and it is sleeved on the outside of the supporting column. The bottom of the connecting ring is welded to the base plate and the top is welded to the bellows to ensure sealing.

[0044] (5) The anchor bolts are inserted into the secondary grouting holes reserved in the civil engineering foundation. After the pad is installed in place, the anchor bolts are grouted for the second time. The base plate is welded around the perimeter to the embedded steel plate of the civil engineering foundation to form a double insurance to ensure a solid foundation.

[0045] (6) The specification of the bellows is DN100. It is installed on the outside of the supporting column, welded to the connecting ring at the bottom and welded to the connecting pipe at the top to ensure sealing.

[0046] (7) The pipe is a cylindrical structure with an inner diameter of 100 mm. It is sleeved on the outside of the supporting column. The bottom is welded to the bellows, and the top is flange-connected to the vacuum chamber penetration interface and sealed with an O-ring.

[0047] (8) The frame structure is welded with 100mm×100mm stainless steel square tubes. The frame structure is 5.5m long and 3m wide along the axial direction of the cabin. The frame structure is installed above the base platform and fixed to the base platform with non-standard bolts through T-slots. The frame structure adopts a high rigidity design. Its function is to transmit the engine thrust to the base platform on the one hand and support the engine to the required height on the other hand.

[0048] (9) The moving mechanism consists of a guide rail and a moving trolley, such as Figure 3 As shown, it is used to install the thrust measurement device and the engine. The guide rail is installed above the frame structure and connected to the frame structure by bolts. The guide rail consists of 2 guide rails and 2 fixed rails. The guide rails are used to guide the movement of the mobile trolley, and the fixed rails are used to fix the mobile trolley. The size of the mobile trolley is 3m (length) × 1.5m (width). The slider at the bottom cooperates with the guide rail so that the mobile trolley can only run along the guide rail. A semicircular groove is opened in the middle of the upper surface of the guide rail, and a steel ball is placed in the groove. The steel ball is made of 9Cr18 stainless steel and is plated with molybdenum disulfide on the surface to enhance the lubrication performance. Baffles are set at both ends of the groove of the guide rail to prevent the steel ball from falling out of the groove. The fixed rail is in the form of a T-slot, and there is a row of through holes on both sides of the corresponding mobile trolley. The fixed rail and the mobile trolley are locked by non-standard bolts to ensure a reliable structure during the test.

[0049] (10) The mobile trolley is controlled by electric remote control. The explosion-proof grade of the motor of the mobile trolley is ExdIIBT4, and it can operate reliably under vacuum. The controller has functions such as opening, closing, forward, backward, fast, slow, emergency stop, and inching operation. The fast gear speed is 20-50mm / s, and the slow gear speed is 0.5-3mm / s. It can realize large-scale rapid movement of the mobile trolley position and small-scale fine adjustment.

[0050] (11) A proximity switch is set at each end limit position of the guide rail. When the mobile trolley moves to a position 5 mm away from the proximity switch, the proximity switch can be triggered, so that the mobile trolley cannot continue to move in the direction of the proximity switch, thereby preventing the mobile trolley from derailing.

[0051] (12) A knob is set on the side of the mobile trolley with two gears: "lock" and "free". When the mobile trolley is locked with the fixed rail, the knob is placed in the "lock" gear to shield the remote control and prevent accidental touch from causing structural damage. When the mobile trolley is disengaged from the fixed rail, the knob is placed in the "free" gear and the remote control can control the mobile trolley normally.

[0052] (13) In case of power failure, the mobile trolley has a manual movement function. By inserting the rotating handle into the rotating shaft of the mobile trolley motor, the motor rotation can be manually controlled, thereby controlling the movement of the mobile trolley.

[0053] There are two 546mm (length) × 355mm (width) openings symmetrically opened on the surface of the mobile vehicle along the axis. When conducting high-altitude simulation tests of liquid attitude and orbit control engines, the propellant recovery pipeline can pass downward through the opening area and extend from the side of the frame structure, which is conducive to filling and draining the pipeline.

Claims

1. A vacuum chamber test platform, characterized in that: It comprises a basic platform (1), a frame structure (2), and a moving mechanism (3); The basic platform (1), the frame structure (2), and the moving mechanism (3) are connected in sequence from bottom to top, and the basic platform (1) is fixed on the foundation; The basic platform (1) comprises a table top (11), a supporting column (12), a connecting pipe (13), a bellows (14), a pad (15), and anchor bolts (16) arranged in a vacuum chamber (4); the supporting column (12) is located below the table top (11), passes through a chamber penetration interface (47) of the vacuum chamber, and is fixedly connected to the table top (11) at its upper end and to the pad (15) at its lower end; the bellows (14) is sleeved on the outside of the supporting column (12); the pad The plate (15) comprises a bottom plate and a connecting ring; the connecting ring is located at the center position above the bottom plate, is sleeved on the outside of the supporting column (12), the bottom of the connecting ring is welded to the bottom plate, and the top is welded to the bellows (14); the bottom plate is fixed to the foundation by anchor bolts (16); the connecting pipe (13) is a cylindrical structure, is sleeved on the outside of the supporting column (12), the bottom is welded to the bellows (14), and the top is flange-connected to the vacuum chamber penetration interface (47), and is sealed by a rubber ring; The frame structure (2) is mounted on the base platform (1) and is detachably connected to the base platform (1); it is used to transmit the engine thrust to the base platform (1) and to support the engine to a certain height; The moving mechanism (3) comprises a fixed guide rail (31), a guide rail (32), a moving trolley (33), a slider (34), a steel ball (35), and a bolt (36); the moving mechanism (3) is used to install a thrust measuring device (44) and an engine (43); the fixed guide rail (31) and the guide rail (32) are installed on the frame structure (2) and are detachably connected to the frame structure; the fixed guide rail (31) is used to fix the moving trolley, and the guide rail (32) is used to guide the movement of the moving trolley; the moving trolley (33) is located on the fixed guide rail (31 ), above the guide rail (32), a bolt (36) is fixed on the moving trolley (33), and the moving trolley (33) is locked with the fixed rail (31) and the moving trolley through the bolt (36); a slider (34) is fixed on the moving trolley (33) and cooperates with the guide rail (32), a steel ball (35) is located between the slider (34) and the guide rail (32), and the moving trolley (33) can move along the guide rail (32); an opening area is symmetrically arranged on the surface of the moving trolley (33) along the axis; the opening area is used for the propellant recovery pipeline (46) to pass through.

2. The vacuum chamber test platform according to claim 1, characterized in that: The supporting columns (12) are provided in eight pieces and are evenly distributed in two rows and four columns below the table top (11); the supporting columns (12) are hollow circular tubes with a specification of φ80×20; the upper ends of the supporting columns (12) are welded to the table top (11), and the lower ends are welded to the pad (15).

3. The vacuum chamber test platform according to claim 1, characterized in that: The anchor bolt (16) is M36 and is locked with double nuts. The inner diameter of the connecting ring is 100 mm.

4. The vacuum chamber test platform according to claim 1, characterized in that: The base plate has a size of 120 mm×120 mm and a thickness of 30 mm. Through holes with a diameter of 40 mm are provided at the four corners of the base plate, and anchor bolts (16) pass through the through holes to fix the base plate on the foundation.

5. The vacuum chamber test platform according to claim 1, characterized in that: The rubber ring between the connecting pipe (13) and the cabin penetration interface (47) is an O-type rubber ring.

6. The vacuum chamber test platform according to claim 1, characterized in that: The specification of the bellows (14) is DN100.

7. The vacuum chamber test platform according to claim 1, characterized in that: The frame structure (2) is formed by welding 100mm×100mm stainless steel square tubes, with an axial length of 5.5m and a width of 3m along the cabin body.

8. The vacuum chamber test platform according to claim 1, characterized in that: The fixed guide rail (31) and the guide guide rail (32) are both provided with two; the fixed guide rail (31) is in the form of a T-slot, and the bolt (36) matches the T-slot structure; A semicircular groove is arranged in the middle of the upper surface of the guide rail (32), and a steel ball (35) is placed in the groove; baffles are arranged at both ends of the groove of the guide rail (32), and the baffles prevent the steel ball (35) from falling out of the groove; the steel ball (35) is made of 9Cr18 stainless steel and is plated with molybdenum disulfide on the surface.

9. The vacuum chamber test platform according to claim 1, characterized in that: The mobile trolley is 3m long and 1.5m wide; The moving mechanism (3) further comprises a motor for driving the moving trolley (33) to move, and a remote controller for controlling the movement of the motor. The explosion-proof grade of the motor of the moving trolley (33) is ExdIIBT4, and it can move under vacuum. The remote controller has the functions of opening, closing, moving forward, moving backward, fast, slow, emergency stop, and inching. The fast gear speed is 20 mm / s to 50 mm / s, and the slow gear speed is 0.5 mm / s to 3 mm / s, so that the moving trolley (33) can be moved quickly and finely adjusted. A proximity switch is provided at each of the two extreme positions of the guide rail (32); when the moving trolley (33) moves to a position 5 mm away from the proximity switch, the proximity switch is triggered to stop the moving trolley (33); A knob is arranged on the side of the movable trolley (33), which has two gears: locking and free. When the movable trolley (33) and the fixed guide rail (31) are locked, the knob is placed in the locking gear to shield the remote control; when the movable trolley (33) and the fixed guide rail (31) are disengaged, the knob is placed in the free gear, and the remote control can control the movable trolley normally. The surface of the movable trolley (33) is symmetrically provided with two opening areas along the axis, and the length of the opening area is 546 mm and the width is 355 mm.

10. The vacuum chamber test platform according to claim 1, characterized in that: The moving mechanism (3) also includes a rotating handle connected to the moving trolley (33) and used to control the movement of the moving trolley (33).

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