A simulated counterweight structure for a recycling test

Abstract

The application relates to a simulation counterweight structure for recovery test, belonging to the technical field of rocket recovery, which comprises a hoisting section, a hook section, a connecting section and a counterweight section which are sequentially arranged from top to bottom. The hoisting section comprises a hoisting cylinder body, and a hoisting seat which can move horizontally is arranged in the hoisting cylinder body. The hook section comprises a bearing frame, the upper end of the bearing frame is fixedly connected with the hoisting cylinder body, a posture sensor is arranged at the center of the upper end of the bearing frame, a circle of hooks is rotatably arranged outside the bearing frame, an angle encoder is arranged at the hinge of the hooks, a buffer hydraulic cylinder is arranged between the hooks and the bearing frame, and a pressure sensor is arranged on the buffer hydraulic cylinder. The connecting section comprises a connecting cylinder body, and the upper end of the connecting cylinder body is fixedly connected with the bearing frame. The counterweight section comprises a counterweight cylinder body, and a plurality of first counterweight blocks and second counterweight blocks are arranged in the counterweight cylinder body. The application solves the problem that there is currently a lack of a counterweight system specially used for rocket recovery test.

Description

Technical Field

[0001] This invention belongs to the field of rocket recovery technology, specifically relating to a simulated counterweight structure for recovery tests. Background Technology

[0002] Vertical rocket recovery technology is key to reducing space launch costs. Before the actual flight test of the rocket control system, thorough ground simulation tests must be conducted. These tests typically use a scaled-down model or a full-size rocket body, suspended by a crane or tower, to simulate the descent process of the rocket's landing phase and verify the functionality of the recovery system.

[0003] In these types of tests, the counterweight system plays a crucial role, requiring precise simulation of the rocket's weight and center of gravity. While current counterweights can be referenced from other fields, they suffer from significant shortcomings. Traditional counterweights typically use concrete blocks or composite steel plates, which are inconvenient for center of gravity adjustment, cannot measure data during the rocket's descent, and cannot adjust the rocket's initial descent attitude, thus affecting the comprehensiveness of the test coverage. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and proposes a simulated counterweight structure for recovery tests; it solves the problem of the lack of a counterweight system specifically for rocket recovery tests.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution.

[0006] A simulated counterweight structure for recycling tests includes, from top to bottom, a lifting section, a hook section, a connecting section, and a counterweight section. The lifting section includes a lifting cylinder with a horizontally movable lifting seat inside. The hook section includes a support frame, the upper end of which is fixedly connected to the lifting cylinder. An attitude sensor is located at the center of the upper end of the support frame. A ring of hooks is rotatably mounted on the outside of the support frame. An angle encoder is located at the hinge of the hooks. A buffer pressure cylinder is located between the hooks and the support frame, and a pressure sensor is mounted on the buffer pressure cylinder. The connecting section includes a connecting cylinder with its upper end fixedly connected to the support frame. The counterweight section includes a counterweight cylinder with a plurality of first counterweight blocks and second counterweight blocks inside.

[0007] Furthermore, the lifting cylinder, connecting cylinder, and counterweight cylinder are all cylindrical structures with openings at both the top and bottom.

[0008] Furthermore, upper and lower lifting flanges are fixedly installed on the outer sides of the openings at the upper and lower ends of the lifting cylinder, respectively. A support plate is fixedly installed in the middle of the inner side of the lifting cylinder, and a cross reinforcing rib is fixedly installed at the upper end of the support plate. A lifting mounting plate is fixedly installed on the upper end of the inner wall of the lifting cylinder, and multiple rows of mounting holes are arranged along the axis of the lifting cylinder on the lifting mounting plate. Two rows of mating holes are provided on the lifting base, and the two rows of mating holes on the lifting base correspond to the two rows of mounting holes on the lifting mounting plate. The corresponding mating holes and mounting holes are fixedly connected by bolts and nuts.

[0009] Furthermore, the support frame includes an upper cross and a lower cross; four vertical fixing rods are fixedly installed between the upper and lower crosses; an upper support flange is fixedly installed at the upper end of the upper cross, and the upper support flange and the lower lifting flange are fixedly connected by a ring of bolts and nuts; a control cabinet is fixedly installed at the center of the upper end of the lower cross, and the control cabinet is used to place the measurement and control components; a lower support flange is fixedly installed at the lower end of the upper cross; the attitude sensor is fixedly installed at the center of the upper end of the upper cross; a hook mounting seat is fixedly installed on each of the four outer edges of the lower support flange; a cylinder connecting lug is fixedly installed on the upper end of the outer side of each fixing rod.

[0010] Furthermore, a hook is rotatably mounted on each hook mounting base; the hook includes a rotating shaft, a hook body, and a spring stop; a rotating shaft is fixedly mounted on one end of the hook body, the rotating shaft is hinged to the corresponding hook mounting base, and an angle encoder is mounted at the hinge point between the rotating shaft and the hook mounting base; a U-shaped hook is mounted on the other end of the hook body, and a spring stop is rotatably mounted inside the U-shaped hook; a piston rod connecting lug is fixedly mounted in the middle of the hook body.

[0011] Furthermore, the four cylinder connecting ears are respectively provided with the four piston rod connecting ears, and a buffer pressure cylinder is provided between the corresponding cylinder connecting ears and piston rod connecting ears. One end of the bottom of the buffer pressure cylinder is hinged to the cylinder connecting ear, and one end of the piston rod of the buffer pressure cylinder is hinged to the piston rod connecting ear.

[0012] Furthermore, a limiting rod is fixedly installed on the upper outer side of each fixed rod, with the end of the limiting rod away from the fixed rod inclined downwards and outwards; the four limiting rods are respectively set with four hooks; the corresponding limiting rods, hooks, and buffer pressure cylinders are located in the same plane.

[0013] Furthermore, an upper connecting flange and a lower connecting flange are fixedly installed on the outer sides of the openings at the upper and lower ends of the connecting cylinder, respectively. The upper connecting flange is fixedly connected to the lower bearing flange by a ring of bolts and nuts. The number of connecting sections is selected according to different test requirements, and multiple connecting cylinders are fixedly connected in sequence.

[0014] Furthermore, an upper counterweight flange is fixedly installed on the outer side of the upper opening of the counterweight cylinder. The upper counterweight flange is fixedly connected to the lower connecting flange of the lowest connecting cylinder by a ring of bolts and nuts.

[0015] Furthermore, a horizontal annular fixing plate is fixedly installed at the lower end of the inner wall of the counterweight cylinder. Multiple first counterweight blocks are placed on the upper end of the fixing plate, and multiple second counterweight blocks are placed on the upper end of the first counterweight blocks. Multiple connecting bolts pass through the fixing plate, multiple first counterweight blocks, and multiple second counterweight blocks from bottom to top and are screwed with connecting nuts, thereby fixing the first counterweight blocks, second counterweight blocks and counterweight cylinder together.

[0016] The beneficial effects of this invention compared to the prior art are as follows: (1) The simulated counterweight can be adjusted in height, weight and center of gravity within a certain range according to the test requirements; (2) The simulated counterweight can realize the adjustment of the cylinder axis and vertical inclination angle in the initial state; (3) The simulated counterweight has a buffer hook, which can buffer the impact load between the capture mechanism and the cylinder during the capture process; (4) The counterweight is equipped with a portable integrated data acquisition device, which can simultaneously collect multiple physical quantities such as the cylinder's attitude, cylinder acceleration, hook rotation angle, and buffer pressure cylinder pressure, and is used to analyze the changes in relevant parameters during the cylinder's fall process. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a structural schematic diagram of the lifting section; Figure 3 This is a diagram showing the position of the hook in the hook segment when it is at its lower limit. Figure 4 This is a diagram showing the position of the hook in the hook segment when it is at its upper limit. Figure 5 This is a structural schematic diagram of the load-bearing frame; Figure 6 This is a structural diagram of the hook; Figure 7 This is a structural diagram of the connecting section; Figure 8This is a schematic diagram of the counterweight section; Figure 9 This is a schematic diagram of the data acquisition principle.

[0018] Among them, 1 is the lifting section, 2 is the hook section, 3 is the connecting section, 4 is the counterweight section, 5 is the lifting seat, 6 is the lifting mounting plate, 7 is the cross reinforcing rib, 8 is the lower lifting flange, 9 is the load-bearing frame, 10 is the limit rod, 11 is the buffer hydraulic cylinder, 12 is the hook, 13 is the attitude sensor, 14 is the pressure sensor, 15 is the cylinder body connecting lug, 16 is the control cabinet, 17 is the hook mounting seat, 18 is the angle encoder, 19 is the attitude sensor mounting flange, 20 is the upper load-bearing flange, 21 is the buffer hydraulic cylinder mounting flange, 22 is the control cabinet mounting flange, 23 is the hook mounting flange, 24 is the lower load-bearing flange, 25 is the rotating shaft, 26 is the stiffening plate, 27 is the piston rod connecting lug, 28 is the hook body, 29 is the spring stop plate, 30 is the upper load-bearing flange, 20 is the lower load-bearing flange, 21 is the buffer hydraulic cylinder mounting flange, 22 is the control cabinet mounting flange, 23 is the hook mounting flange, 24 is the lower load-bearing flange, 25 is the rotating shaft, 26 is the stiffening plate, 27 is the piston rod connecting lug, 28 is the hook body, 29 is the spring stop plate, 30 is the lower load-bearing flange, 20 is the upper ... 31 is the connecting flange, 32 is the connecting cylinder, 33 is the connecting lower flange, 34 is the counterweight cylinder, 35 is the connecting bolt, 36 is the first counterweight block, and 37 is the second counterweight block. Detailed Implementation

[0019] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0020] like Figure 1 As shown in Figure 8, this invention provides a simulated counterweight structure for recycling tests, comprising, from top to bottom, a lifting section 1, a hook section 2, a connecting section 3, and a counterweight section 4. The lifting section 1 includes a lifting cylinder with a horizontally movable lifting seat 5 inside. The hook section 2 includes a support frame 9, the upper end of which is fixedly connected to the lifting cylinder. An attitude sensor 13 is located at the center of the upper end of the support frame 9. A ring of hooks 12 is rotatably arranged on the outside of the support frame 9. An angle encoder 18 is located at the hinge of the hooks 12. A buffer pressure cylinder 11 is located between the hooks 12 and the support frame 9, and a pressure sensor 14 is located on the buffer pressure cylinder 11. The connecting section 3 includes a connecting cylinder 31 with its upper end fixedly connected to the support frame 9. The counterweight section 4 includes a counterweight cylinder 33 with a plurality of first counterweight blocks 35 and second counterweight blocks 36 inside.

[0021] The lifting cylinder, connecting cylinder 31, and counterweight cylinder 33 are all cylindrical structures with openings at both the top and bottom.

[0022] Upper and lower lifting flanges 8 are fixedly installed on the outer sides of the openings at the top and bottom of the lifting cylinder, respectively. A horizontal support plate is fixedly installed in the middle of the inner side of the lifting cylinder, and a cross-shaped reinforcing rib 7 is fixedly installed on the upper part of the support plate. The four outer ends of the cross-shaped reinforcing rib 7 are fixedly connected to the inner wall of the lifting cylinder. A horizontal lifting mounting plate 6 is fixedly installed on the upper end of the inner wall of the lifting cylinder, located above the cross-shaped reinforcing rib 7. Multiple rows of mounting holes are arranged on the lifting mounting plate 6 along the axis of the lifting cylinder. Two rows of mating holes are provided on the lifting base 5, which correspond to the two rows of mounting holes on the lifting mounting plate 6. The corresponding mating holes and mounting holes are fixedly connected by bolts and nuts. By aligning the two rows of mating holes on the lifting base 5 with the two different rows of mounting holes on the lifting mounting plate 6, the horizontal position of the lifting base 5 can be adjusted, thereby changing the relative position of the lifting position with the axis of the simulated counterweight cylinder 33.

[0023] The support frame 9 includes an upper cross, a lower cross, fixing rods, an upper support flange 20, and a lower support flange 24. Both the upper and lower crosses are horizontally arranged cross-shaped rod structures, positioned vertically opposite each other. Four vertical fixing rods are fixed between the upper and lower crosses, arranged in a circular array around the axis of the support frame 9. Reinforcing ribs are fixed at the connection points between the fixing rods and the lower cross. The upper support flange 20 is fixedly installed at the upper end of the upper cross. The upper support flange 20 is a horizontally arranged annular plate structure, and it is fixedly connected to the lower lifting flange 8 by a ring of bolts and nuts. A control cabinet mounting flange 22 is fixedly installed at the center of the upper end of the lower cross. A control cabinet 16 is fixedly installed on the upper end of the control cabinet mounting flange 22. The control cabinet 16 houses the measurement and control components, which collect and store signals from the attitude sensor 13, pressure sensor 14, and angle encoder 18. A lower bearing flange 24 is fixedly installed at the lower end of the upper cross. The lower bearing flange 24 is a horizontally arranged annular plate structure. An attitude sensor mounting flange 19 is fixedly installed at the upper center of the upper cross. An attitude sensor 13 is fixedly installed on the attitude sensor mounting flange 19. The attitude sensor 13 is used to measure the attitude change of the simulated counterweight during the drop process in real time. A vertical hook mounting flange 23 is fixedly installed on the outer edge of the lower bearing flange 24. A hook mounting seat 17 is fixedly installed on each hook mounting flange 23. A buffer pressure cylinder mounting flange 21 is fixedly installed on the upper outer surface of each fixing rod. A cylinder connecting lug 15 is fixedly installed on each buffer pressure cylinder mounting flange 21.

[0024] A hook 12 is rotatably mounted on each hook mounting base 17. Each hook 12 includes a rotating shaft 25, a hook body 28, and a spring stop 29. The rotating shaft 25 is fixedly mounted at one end of the hook body 28, and ribs 26 are fixedly mounted on both sides of the connection between the rotating shaft 25 and the hook body 28. The rotating shaft 25 is hinged to the corresponding hook mounting base 17, and an angle encoder 18 is installed at the hinge point between the rotating shaft 25 and the hook mounting base 17. The angle encoder 18 is used to measure the rotation angle of the hook 12. A U-shaped hook is mounted at the other end of the hook body 28, and a spring stop 29 is rotatably mounted inside the U-shaped hook. A torsion spring is installed at the hinge point between the spring stop 29 and the U-shaped hook, providing a spring-loaded rebound function. A piston rod connecting lug 27 is fixedly mounted in the middle of the hook body 28.

[0025] Four cylinder body connecting lugs 15 are respectively provided with four piston rod connecting lugs 27. A buffer pressure cylinder 11 is provided between the corresponding cylinder body connecting lug 15 and piston rod connecting lug 27. One end of the bottom of the buffer pressure cylinder 11 is hinged to the cylinder body connecting lug 15, and one end of the piston rod of the buffer pressure cylinder 11 is hinged to the piston rod connecting lug 27. The pressure sensor 14 is installed at the oil port of the buffer pressure cylinder 11 and is used to measure the oil pressure of the buffer pressure cylinder 11.

[0026] A limiting rod 10 is fixedly installed on the upper outer side of each fixed rod. The limiting rod 10 is located on the upper side of the buffer hydraulic cylinder mounting flange 21, and the end of the limiting rod 10 away from the fixed rod is inclined outward and downward. The four limiting rods 10 are respectively set with four hooks 12. The corresponding limiting rods 10, hooks 12, and buffer hydraulic cylinders 11 are located in the same plane. The limiting rods 10 are used to limit the extreme position of the rotation of the hooks 12, preventing the buffer hydraulic cylinders 11 from overtravel, thus playing a protective role. After the hooks 12 are in position, the axis of the limiting rods 10 is perpendicular to the upper surface of the hooks 12. By replacing the limiting rods 10 with different lengths, different termination positions of the hooks 12 can be controlled.

[0027] After the hook 12 contacts the capture mechanism, the hook 12 rotates, and the buffer pressure cylinder 11 is passively retracted, which buffers the load through the internal throttling device. After the hook 12 contacts the capture mechanism rope, it acts on the spring stop plate 29. The spring stop plate 29 opens, and after the capture rope slides into the U-shaped hook at the end of the hook body 28, the spring stop plate 29 automatically resets under the action of the torsion spring to prevent the rope from coming out.

[0028] An upper connecting flange 30 and a lower connecting flange 32 are fixedly installed on the outer sides of the openings at the upper and lower ends of the connecting cylinder 31, respectively. The upper connecting flange 30 is fixedly connected to the lower bearing flange 24 by a ring of bolts and nuts. The number of connecting sections 3 is selected according to different test requirements, and multiple connecting cylinders 31 are fixedly connected in sequence.

[0029] A counterweight upper flange is fixedly installed on the outer side of the upper opening of the counterweight cylinder 33. The counterweight upper flange is fixedly connected to the lower connecting flange 32 of the lowest connecting cylinder 31 by a ring of bolts and nuts. A horizontal annular fixing plate is fixedly installed on the lower end of the inner wall of the counterweight cylinder 33. Multiple first counterweight blocks 35 are placed on the upper part of the fixing plate, and multiple second counterweight blocks 36 are placed on the upper part of the first counterweight blocks 35. The first counterweight blocks 35 and the second counterweight blocks 36 are both horizontally arranged circular steel plates. Multiple connecting bolts 34 pass through the fixing plate, multiple first counterweight blocks 35, and multiple second counterweight blocks 36 from bottom to top, and are screwed with connecting nuts, thereby fixing the first counterweight blocks 35, the second counterweight blocks 36 and the counterweight cylinder 33.

[0030] The working principle of this invention is as follows: Lifting section 1 is located in the first section, and hook section 2 is located in the second section. Different numbers of connecting sections 3 are selected based on the simulated counterweight length requirements. Several counterweights are placed within the counterweight section 4 to meet the total mass requirements. The position of the counterweight section 4 relative to the simulated counterweight is adjusted according to the required center of gravity height to ensure the required center of gravity height.

[0031] According to the simulated counterweight starting angle requirements, the two rows of docking holes on the lifting base 5 are aligned with the two different rows of mounting holes on the lifting mounting plate 6 (that is, the horizontal distance between the lifting base 5 and the cylinder axis is changed). Under its own weight, the counterweight rotates around the rotation axis 25 of the lifting base 5, and the cylinder is initially in an inclined state.

[0032] To measure parameters during the simulated counterweight drop and contact with the capture mechanism, three types of sensors are installed. These include: a pressure sensor 14 for each buffer hydraulic cylinder 11 to collect real-time hydraulic pressure changes during cylinder 11 operation, for a total of four pressure sensors 14; an angle encoder 18 at the hinge shaft of each hook 12 to collect real-time angle changes after the hook 12 contacts the capture mechanism; and an attitude sensor 13 installed on the hook section 2 to measure acceleration and tilt angle changes during the simulated counterweight drop and capture process.

[0033] like Figure 9As shown, the data acquisition device is located inside the control cabinet 16. Data acquisition and processing are controlled by a PLC. The pressure sensor 14 collects analog signals, which are input to the CPU through the PLC analog input module; the angle encoder 18 collects high-speed pulse signals, which are input to the CPU through the PLC high-speed counting module; and the attitude sensor 13 is input to the CPU through a serial communication module. After processing the above signals, the CPU outputs them to the storage module in .xsl format. Users can read the test data through an SD card and analyze the test process offline. The data acquisition unit is powered by a mobile power supply, enabling synchronous and high-precision acquisition of multiple physical quantities of the mechanical system by the counterweight in the absence of power.

[0034] The data collection process is as follows: Power on: Turn on the power bank, the entire system starts up, the PLC runs the program, and waits for system instructions; Start-up: When the user presses the "Start" button on the remote control, the PLC's CPU begins to scan all input modules in a loop, reads sensor data, and writes it to the SD card. Operation: During the simulated weight drop and capture process, the system continuously collects data, and the SD card file continues to grow. Stop: When the user presses the "Stop" button via remote control, the PLC's CPU stops data acquisition and storage, and safely closes the file.

[0035] Export: The user removes the SD card and analyzes the experimental data on the computer.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A simulated counterweight structure for recycling experiments, characterized in that: The system comprises, from top to bottom, a lifting section (1), a hook section (2), a connecting section (3), and a counterweight section (4). The lifting section (1) includes a lifting cylinder, inside which a horizontally movable lifting seat (5) is installed. The hook section (2) includes a support frame (9), the upper end of which is fixedly connected to the lifting cylinder. An attitude sensor (13) is installed at the center of the upper end of the support frame (9), and a ring of hooks (12) is rotatably installed on the outside of the support frame (9). An angle encoder (18) is provided at the hinge, and a buffer pressure cylinder (11) is provided between the hook (12) and the bearing frame (9). A pressure sensor (14) is provided on the buffer pressure cylinder (11); the connecting section (3) includes a connecting cylinder (31), the upper end of which is fixedly connected to the bearing frame (9); the counterweight section (4) includes a counterweight cylinder (33), and a plurality of first counterweight blocks (35) and second counterweight blocks (36) are provided inside the counterweight cylinder (33). Lifting upper flange and lifting lower flange (8) are fixedly installed on the outer side of the openings at the upper and lower ends of the lifting cylinder, respectively. A support plate is fixedly installed in the middle of the inner side of the lifting cylinder. A cross reinforcing rib (7) is fixedly installed on the upper end of the support plate. A lifting mounting plate (6) is fixedly installed on the upper end of the inner wall of the lifting cylinder. Multiple rows of mounting holes are arranged on the lifting mounting plate (6) along the axis of the lifting cylinder. Two rows of docking holes are provided on the lifting seat (5). The two rows of docking holes on the lifting seat (5) correspond to the two rows of mounting holes on the lifting mounting plate (6). The corresponding docking holes and mounting holes are fixedly connected by bolts and nuts. The support frame (9) includes an upper cross and a lower cross; four vertical fixing rods are fixedly installed between the upper and lower crosses; a support upper flange (20) is fixedly installed at the upper end of the upper cross; the support upper flange (20) and the lifting lower flange (8) are fixedly connected by a ring of bolts and nuts; a control cabinet (16) is fixedly installed at the center of the upper end of the lower cross; the control cabinet (16) is used to place the measurement and control components; a support lower flange (24) is fixedly installed at the lower end of the upper cross; the attitude sensor (13) is fixedly installed at the center of the upper end of the upper cross; a hook mounting seat (17) is fixedly installed on the outer edges of the support lower flange (24); a cylinder connecting lug (15) is fixedly installed on the upper end of the outer side of each fixing rod.

2. The simulated counterweight structure for recycling tests according to claim 1, characterized in that: The lifting cylinder, connecting cylinder (31), and counterweight cylinder (33) are all cylindrical structures with openings at both the top and bottom.

3. The simulated counterweight structure for recycling tests according to claim 1, characterized in that: A hook (12) is rotatably mounted on each hook mounting base (17); the hook (12) includes a rotating shaft (25), a hook body (28), and a spring stop (29); a rotating shaft (25) is fixedly mounted on one end of the hook body (28), the rotating shaft (25) is hinged to the corresponding hook mounting base (17), the angle encoder (18) is mounted at the hinge point between the rotating shaft (25) and the hook mounting base (17), a U-shaped hook is mounted on the other end of the hook body (28), and a spring stop (29) is rotatably mounted inside the U-shaped hook; a piston rod connecting lug (27) is fixedly mounted in the middle of the hook body (28).

4. The simulated counterweight structure for recycling tests according to claim 3, characterized in that: Four cylinder connecting ears (15) are respectively set to correspond to four piston rod connecting ears (27). A buffer pressure cylinder (11) is set between the corresponding cylinder connecting ears (15) and piston rod connecting ears (27). One end of the bottom of the buffer pressure cylinder (11) is hinged to the cylinder connecting ear (15), and one end of the piston rod of the buffer pressure cylinder (11) is hinged to the piston rod connecting ear (27).

5. The simulated counterweight structure for recycling tests according to claim 4, characterized in that: A limiting rod (10) is fixedly installed on the upper side of the outer surface of each fixed rod. The end of the limiting rod (10) away from the fixed rod is inclined to the outside and downward. The four limiting rods (10) are respectively set with four hooks (12). The corresponding limiting rods (10), hooks (12) and buffer pressure cylinders (11) are located in the same plane.

6. The simulated counterweight structure for recycling tests according to claim 1, characterized in that: A connecting upper flange (30) and a connecting lower flange (32) are fixedly installed on the outer side of the openings at the upper and lower ends of the connecting cylinder (31). The connecting upper flange (30) is fixedly connected to the bearing lower flange (24) by a ring of bolts and nuts. The number of connecting sections (3) is selected according to different test requirements, and multiple connecting cylinders (31) are fixedly connected in sequence.

7. The simulated counterweight structure for recycling tests according to claim 6, characterized in that: A counterweight upper flange is fixedly installed on the outside of the upper opening of the counterweight cylinder (33). The counterweight upper flange is fixedly connected to the lower flange (32) of the bottom connecting cylinder (31) by a ring of bolts and nuts.

8. The simulated counterweight structure for recycling tests according to claim 7, characterized in that: A horizontal circular fixing plate is fixedly installed at the lower end of the inner wall of the counterweight cylinder (33). Multiple first counterweight blocks (35) are placed on the upper end of the fixing plate, and multiple second counterweight blocks (36) are placed on the upper end of the first counterweight blocks (35). Multiple connecting bolts (34) pass through the fixing plate, multiple first counterweight blocks (35), and multiple second counterweight blocks (36) from bottom to top and are screwed with connecting nuts, thereby fixing the first counterweight blocks (35), the second counterweight blocks (36) to the counterweight cylinder (33).

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