Vehicle acceleration system capable of automatically controlling weight of drop hammer

Abstract

A vehicle acceleration system capable of automatically controlling the weight of a drop hammer comprises the drop hammer, a loading and unloading arm, a tower body, a self-control traction system, an acceleration vehicle and a forced stop system, the top of a drop hammer box body is opened and divided into a plurality of bearing grooves, the bottom of the drop hammer box body is provided with a mounting groove and a pressure strain gauge, and a wireless sensor is arranged in the mounting groove; the pressure strain gauges make contact with the bottoms of the balancing weights and transmit the pressure to the loading and unloading arm through the wireless sensors, and the loading and unloading arm automatically increases and decreases the balancing weights according to the weight needed by the drop hammer. The drop hammer is arranged in the middle of a column type frame of the tower body, the self-control traction system lifts the drop hammer, the drop hammer, the tower body and the acceleration vehicle are connected into a closed loop through a steel wire rope, gravitational potential energy of downward free falling of the drop hammer is converted into acceleration vehicle running kinetic energy, and the acceleration vehicle reaches a specified speed to make contact with the forced stop system, breaks away from the closed loop and continues to freely run forwards. The system is high in safety, high in precision control, mechanized in the whole process, capable of improving the vehicle acceleration efficiency, more perfect in cooperation with different vehicle types, convenient to operate and economical.

Description

Technical Field

[0001] The invention belongs to a vehicle acceleration system, and in particular relates to a vehicle acceleration system capable of automatically controlling a falling weight. Background Art

[0002] Highway guardrails play a vital role as the last line of defense for traffic safety. The industry standard "Highway Guardrail Safety Performance Evaluation Standard" requires that highway guardrails can only be used on the road after undergoing a full-scale collision test with a real vehicle. The full-scale collision test with a real vehicle has the advantages of being real, objective and reliable.

[0003] The core technology in the full-scale collision test of a real vehicle is the acceleration system of the test vehicle. The current acceleration method of test vehicles in China is mainly the drop-hammer gravity acceleration method. The drop-hammer gravity acceleration method is a convenient way to convert gravitational potential energy into vehicle kinetic energy. As long as it has sufficient height and weight, the vehicle's acceleration ability can be achieved. However, due to the different traction settings of different models, it is necessary to perform multiple complex and dangerous operations to change the weight of the weight. At present, in order to save costs and save costs, the counterweight blocks are of different sizes and the weight cannot be unified, which makes the replacement construction very inconvenient. At present, in order to reduce the number of replacements of the weight, the weight tower is generally high, and a lighter weight is used. The potential energy conversion energy is increased by height, which is costly and dangerous. In addition, the weight cannot be taken out after being placed in the tower, and it cannot be weighed every time. The weight of each counterweight block is not fixed, and the accuracy will be more difficult to control when replacing the counterweight block.

[0004] In summary, based on the defects of the drop weight gravity acceleration method and in response to the needs of full-scale collision tests of real vehicles, a vehicle acceleration system with automatic control of the drop weight is proposed. Combined with an automatic control system, it is easy to operate and has high precision, ensuring the safety and reliability of the entire test process. Summary of the invention

[0005] The object of the present invention is to provide a vehicle acceleration system for automatically controlling the weight of a falling weight, so as to overcome the above-mentioned deficiencies in the current prior art.

[0006] The present invention will be realized by the following technical solutions: A vehicle acceleration system for automatically controlling the weight of a drop hammer, comprising a drop hammer, a loading and unloading arm, a tower body, an automatic traction system, an accelerating vehicle, and an emergency stop system. The drop hammer comprises a box body, a bearing slot, a pressure strain gauge, and a wireless sensor. The top of the box body is open, and the box body is divided into six independent bearing slots. A mounting slot is arranged at the bottom of the bearing slot, a pressure strain gauge is arranged at the bottom of the bearing slot, and the pressure strain gauge is arranged on the mounting slot. The wireless sensor is arranged in the mounting slot, and the pressure strain gauge is connected to the wireless sensor through a data line. A counterweight block is arranged in the bearing slot, and the pressure strain gauge contacts the bottom surface of the counterweight block and bears pressure. The pressure strain gauge senses the pressure size through the weight of the counterweight block, and the pressure on the pressure strain gauge forms a signal through the wireless sensor and is transmitted to the wireless receiver on the loading and unloading arm. The loading and unloading arm automatically increases or decreases the counterweight block inside it according to the weight required by the drop hammer. Furthermore, the tower body is a columnar structure, the drop weight is arranged in the middle of the frame of the tower body, and the drop weight is lifted in the vertical direction of the tower body by an automatic traction system. The automatic traction system connects the drop weight, the tower body and the acceleration vehicle into a closed loop through a steel wire rope. The gravitational potential energy of the drop weight falling freely downward is converted into the driving kinetic energy of the acceleration vehicle through the steel wire rope. When the acceleration vehicle reaches a specified speed, it contacts the forced stop system, and the acceleration vehicle detaches from the closed loop structure composed of the steel wire rope, and the acceleration vehicle continues to move forward freely.

[0007] Furthermore, a drop hammer pit is arranged in the middle of the bottom of the tower body, and the drop hammer sits in the drop hammer pit when not being raised, and the loading and unloading arm is arranged at the edge of the drop hammer pit, and the automatic traction system includes a top fixed pulley, a drop hammer movable pulley, a winch, and a PLC operating table, the top fixed pulley and the drop hammer movable pulley are connected in series through a steel wire rope, the top fixed pulley is arranged on the top of the tower body and fixed by a fixed pulley seat, the drop hammer movable pulley and the drop hammer are hinged through a shaft sleeve, the top fixed pulley has one more pulley plate than the drop hammer movable pulley, the steel wire rope passes through the top fixed pulley and is connected to the winch, the winch is fixed to the side of the tower body through a concrete foundation, the PLC operating table is connected to the winch through a data cable, the PLC operating table controls the start and stop of the winch, the PLC operating table is also connected to the loading and unloading arm through a data cable, and the PLC operating table controls the loading and unloading arm to automatically take out and put the counterweight block into the drop hammer.

[0008] Furthermore, the PLC operating console includes an operating interface and a PLC program. The operating interface can manually input the number of rotations of the winch, the weight, speed, acceleration distance of the accelerating vehicle, and the weight of the drop hammer corresponding to the gravitational potential energy. The PLC operating console transmits the parameter information to the winch and the loading and unloading arm through a data line. The winch and the loading and unloading arm are respectively equipped with signal processors. After feedback from the signal processor, the number of rotations of the winch realizes the lifting height control of the drop hammer, and the loading and unloading arm realizes the weight control of the drop hammer. Furthermore, the winch is equipped with an electromagnetic brake disc. When the drop weight is lifted to a specified height, the signal processor instructs the electromagnetic brake disc to automatically stop. When the drop weight needs to fall freely, the signal processor instructs the electromagnetic brake disc to automatically release.

[0009] Furthermore, the loading and unloading arm also includes a vertical rod base, a lifting arm, a turntable, an electromagnet, and a hoist. The vertical rod base is vertically arranged and anchored at the edge of the drop hammer pit. The lifting arm is perpendicular to the vertical rod base. The lifting arm is rotatably connected to the vertical rod base through a turntable. The lifting arm can rotate 360° relative to the vertical rod base and the angle is controlled by a signal processor. The hoist is arranged on the lifting arm, and a slide rail is arranged on the lifting arm. The hoist can move along the slide rail on the lifting arm. The hoist is provided with a retractable steel chain, one end of the steel chain is connected to the hoist shaft, and an electromagnet is arranged at the other end. The electromagnet is connected to the distribution box through an electric wire. After the loading and unloading arm obtains the instruction of the PLC operating console to control the weight of the drop hammer, the electromagnet obtains magnetic force by energizing the distribution box, and the magnetic force disappears after power failure. The power on and off of the electromagnet is controlled by an automatic switch, and the automatic switch is controlled by the signal processor.

[0010] Furthermore, the outer layer of the steel chain is wrapped with a magnetic insulating film, and only the port connected to the electromagnet is exposed to the outside. When the electromagnet is energized, it generates a magnetic force to adsorb the counterweight block. The counterweight block is a steel structure, and the outer layer of the counterweight block is wrapped with a magnetic insulating film, and only the top flat part is exposed to the outside to contact the electromagnet.

[0011] Furthermore, the counterweight blocks have the same structural dimensions and weights, and are adapted to the cross-sectional shape of the bearing slots. Counterweighting is achieved by accumulating and stacking a number of counterweight blocks in the drop hammer, and placement and removal are achieved through a loading and unloading arm.

[0012] Furthermore, the automatic traction system also includes a tractor, a card plate, and a guide rail. The tractor is in sliding contact with the guide rail through steel wheels. A card head is arranged at the bottom of the tractor to clamp on the guide rail. A card slot is arranged at the top of the tractor. One end of the card plate is welded to the bottom of the acceleration vehicle, and the other end is clamped in the card slot. The opening direction of the card slot is consistent with the travel direction of the acceleration vehicle. A traction ring is arranged at the front end of the tractor, and the steel wire rope is wrapped and tightened around the traction ring.

[0013] Furthermore, the forced stop system includes a buffer block, which is divided into two upper and lower blocks and is clamped on the guide rail after being fastened by bolts. The middle of the buffer block is in friction contact with the guide rail through a brake pad.

[0014] Furthermore, the turntable is a rotating motor, and the rotation angle is controlled by a signal processor. When the drop hammer is located in the drop hammer pit and the counterweight needs to be added or removed, the signal processor gives a forward rotation command for the turntable, and the arm rotates to directly above the drop hammer. When the drop hammer needs to be raised in height, the signal processor gives a reverse rotation command for the turntable, and the arm rotates to the edge of the drop hammer pit.

[0015] Furthermore, the drop hammer provides potential energy through its own mass and the height lifted by the tower body. Each accelerated vehicle corresponds to a different mass of the drop hammer and a lifting height. The relevant parameters of the drop hammer and the accelerated vehicle are pre-input through the operation interface and stored in the PLC program. After the acceleration requirement is obtained, the relevant parameters can be directly selected on the operation interface, and the entire vehicle acceleration system will run automatically throughout the process until the accelerated vehicle is accelerated to the specified speed.

[0016] After adopting the above technical solution, the present invention has the following beneficial effects: (1) Combined with the automatic control of the heavy hammer acceleration method, it has high safety and high precision control; (2) Combined with the automatic control system, the test vehicle acceleration is fully mechanized to increase the vehicle acceleration efficiency; (3) The system automatically controls the weight of the falling hammer, which is more perfect for different models and makes it easier to change the weight of the hammer. (4) The different weights of the weights can make the acceleration of different models smoother, and the combination of the weight tower and the runway is more economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the embodiments: Figure 1 It is a schematic diagram of the overall longitudinal section layout of an embodiment of the present invention; Figure 2 It is a schematic diagram of the overall plan layout of an embodiment of the present invention; Figure 3 2 is a schematic plan view of a drop hammer structure according to an embodiment of the present invention; Figure 4 2 is a schematic elevation diagram of a drop hammer structure according to an embodiment of the present invention; Figure 5 Schematic diagram of the top fixed pulley and the drop weight movable pulley in series in the embodiment of the present invention Figure 6 It is a schematic plan view of the loading and unloading arm structure according to an embodiment of the present invention; Figure 7 This is a schematic elevation diagram of a loading and unloading arm structure according to an embodiment of the present invention; Figure 8 Schematic diagram of the steel chain structure of an embodiment of the present invention; Fig. 9 is a detailed diagram of the insulating film of the counterweight block according to an embodiment of the present invention; Fig.10 Schematic diagram of the position relationship between the hoist and the slide rail in an embodiment of the present invention; Fig.11 Schematic diagram of automatic rotation of loading and unloading arm according to an embodiment of the present invention; Fig.12It is a schematic structural diagram of a tractor according to an embodiment of the present invention; Fig.13 is a schematic cross-sectional view of a tractor and a guide rail according to an embodiment of the present invention; Fig.14 is a schematic cross-sectional view of a guide rail according to an embodiment of the present invention; Fig.15 is a schematic diagram of a buffer block according to an embodiment of the present invention; Fig.16 It is a schematic diagram of the principle of the automatic control system of an embodiment of the present invention; Fig.17 It is a schematic diagram of a process flow of controlling a drop weight by a loading and unloading arm according to an embodiment of the present invention; Fig.18 This is a schematic diagram of the acceleration method flow of an embodiment of the present invention; Fig.19 It is a schematic diagram of an electromagnetic brake disc according to an embodiment of the present invention.

[0018] The following are marked in the figure: 1. Drop hammer; 2. Loading and unloading arm; 3. Tower body; 4. Accelerating vehicle; 5. Box body; 6. Loading slot; 7. Pressure strain gauge; 8. Wireless sensor; 9. Mounting slot; 10. Data cable; 11. Counterweight; 12. Wireless receiver; 13. Wire rope; 14. Drop hammer pit; 15. Top fixed pulley; 16. Drop hammer movable pulley; 17. Fixed pulley seat; 18. Bushing; 19. Pulley disc; 20. Winch; 21. Concrete foundation; 22. PLC operation table; 2 3. Operation interface; 24. Signal processor; 25. Vertical pole base; 26. Lifting arm; 27. Turntable; 28. Electromagnet; 29. ​​Hoist; 30. Slide rail; 31. Steel chain; 32. Electric wire; 33. Distribution box; 34. Automatic switch; 35. Magnetic insulating film; 36. Tractor; 37. Pallet; 38. Guide rail; 39. Steel wheel; 40. Chuck; 41. Card slot; 42. Traction ring; 43. Buffer block; 44. Brake pad; 45. Electromagnetic brake disc. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following examples, and all technologies implemented based on the content of the present invention belong to the scope of the present invention.

[0020] like Figure 1 , 2The figure shows an embodiment of a vehicle acceleration system embodiment 1 for automatically controlling the weight of a drop hammer of the present invention, which is characterized in that it includes a drop hammer 1, a loading and unloading arm 2, a tower body 3, an automatic traction system, an accelerating vehicle 4, and an emergency stop system. The drop hammer 1 includes a box body 5, a bearing slot 6, a pressure strain gauge 7, and a wireless sensor 8. The top of the box body 5 is open, and the box body 5 is divided into six independent bearing slots 6. A mounting slot 9 is arranged at the bottom of the bearing slot 6. A pressure strain gauge 7 is arranged at the bottom of the bearing slot 6, and the pressure strain gauge 7 is arranged on the mounting slot 9. The wireless sensor 8 is arranged in the mounting slot 9. The pressure strain gauge 7 is connected to the wireless sensor 8 through a data line 10. A counterweight 11 is arranged in the bearing slot 6. The pressure strain gauge 7 contacts the bottom surface of the counterweight 11 and bears pressure. The pressure strain gauge 7 senses the pressure through the weight of the counterweight 11. The pressure on the pressure strain gauge 7 forms a signal through the wireless sensor 8 and is transmitted to the wireless receiver 12 on the loading and unloading arm 2. The loading and unloading arm 2 automatically increases or decreases the counterweight 11 inside it according to the weight required by the drop hammer 1. Figure 3 , 4 It is a schematic diagram of the plan and elevation of the drop hammer structure of an embodiment of the present invention, the tower body 3 is a columnar structure, the drop hammer 1 is arranged in the middle of the frame of the tower body 3, and the drop hammer 1 is lifted in the vertical direction of the tower body 3 by an automatic traction system. The automatic traction system connects the drop hammer 1, the tower body 3 and the acceleration vehicle 4 into a closed loop through a steel wire rope 13, and the gravitational potential energy of the drop hammer 1 falling freely downward is converted into the driving kinetic energy of the acceleration vehicle 4 through the steel wire rope 13. The acceleration vehicle 4 contacts the forced stop system when reaching the specified speed, and the acceleration vehicle 4 breaks away from the closed loop structure composed of the steel wire rope 13, and the acceleration vehicle 4 continues to move forward freely.

[0021] Figure 51 is a schematic diagram of the top fixed pulley and the drop hammer movable pulley connected in series in an embodiment of the present invention. A drop hammer pit 14 is set in the middle of the bottom of the tower body 3. The drop hammer 1 sits in the drop hammer pit 14 when it is not raised. The loading and unloading arm 2 is set at the edge of the drop hammer pit 14. The automatic traction system includes a top fixed pulley 15, a drop hammer movable pulley 16, a winch 20, and a PLC operating table 22. The top fixed pulley 15 and the drop hammer movable pulley 16 are connected in series through a wire rope 13. The top fixed pulley 15 is set at the top of the tower body 3 and fixed by a fixed pulley seat 17. The drop hammer movable pulley 16 and The drop hammer 1 is hinged by a shaft sleeve 18, and the top fixed pulley 15 has one more pulley plate 19 than the drop hammer movable pulley 16. The wire rope 13 passes through the top fixed pulley 15 and is connected to the winch 20. The winch 20 is fixed to the side of the tower body 3 through a concrete foundation 21. The PLC operating console 22 is connected to the winch 20 through a data cable 10. The PLC operating console 22 controls the start and stop of the winch 20. The PLC operating console 22 is also connected to the loading and unloading arm 2 through the data cable 10. The PLC operating console 22 controls the loading and unloading arm 2 to automatically take out and place the counterweight 11 into the drop hammer 1.

[0022] Fig.16 It is a schematic diagram of the principle of the automatic control system of an embodiment of the present invention. The PLC operating console 22 includes an operating interface 23 and a PLC program. The operating interface 23 can manually input the number of rotations of the winch 20, the weight, speed, acceleration distance of the accelerating vehicle 4, and the weight of the drop hammer 1 corresponding to the gravitational potential energy. The PLC operating console 22 transmits the parameter information to the winch 20 and the loading and unloading arm 2 through the data line 10 respectively. The winch 20 and the loading and unloading arm 2 are respectively installed with a signal processor 24. After feedback from the signal processor 24, the number of rotations of the winch 20 realizes the lifting height control of the drop hammer 1, and the loading and unloading arm 2 realizes the weight control of the drop hammer 1.

[0023] Fig.19 It is a schematic diagram of the electromagnetic brake disc of an embodiment of the present invention. The winch 20 is equipped with an electromagnetic brake disc 45. When the drop hammer 1 is lifted to a specified height, the signal processor 24 instructs the electromagnetic brake disc 45 to automatically stop. When the drop hammer 1 needs to fall freely, the signal processor 24 instructs the electromagnetic brake disc 45 to automatically release.

[0024] Figure 6 , 7 It is a plan and elevation schematic diagram of the loading and unloading arm structure of an embodiment of the present invention. The loading and unloading arm 2 also includes a vertical rod base 25, a lifting arm 26, a turntable 27, an electromagnet 28, and a hoist 29. The vertical rod base 25 is vertically arranged and anchored at the edge of the hammer drop pit 14. The lifting arm 26 is perpendicular to the vertical rod base 25. The lifting arm 26 is rotatably connected to the vertical rod base 25 through the turntable 27. The lifting arm 26 can achieve 360° rotation relative to the vertical rod base 25 and the angle is controlled by the signal processor 24. Fig.103 is a schematic diagram of the position relationship between the hoist and the slide rail in an embodiment of the present invention. The hoist 29 is arranged on the arm 26, and the arm 26 is provided with a slide rail 30. The hoist 29 can move on the arm 26 along the slide rail 30. The hoist 29 is provided with a retractable steel chain 31. One end of the steel chain 31 is connected to the shaft of the hoist 29, and the other end is provided with an electromagnet 28. The electromagnet 28 is connected to the distribution box 33 through an electric wire 32. After the loading and unloading arm 2 obtains the instruction of the PLC operating table 22 to control the weight of the drop hammer 1, the electromagnet 28 obtains magnetic force by energizing the distribution box 33, and the magnetic force disappears after power is cut off. The power on and off of the electromagnet 28 is controlled by the automatic switch 34, and the automatic switch 34 is controlled by the signal processor 24.

[0025] Figure 8 Schematic diagram of the steel chain structure of an embodiment of the present invention. The outer layer of the steel chain 31 is wrapped with a magnetic insulating film 35, and only the port connected to the electromagnet 28 is exposed. When the electromagnet 28 is energized, it generates magnetic force to adsorb the counterweight 11. Fig. 9 It is a detailed diagram of the insulating film of the counterweight block of an embodiment of the present invention. The counterweight block 11 is a steel structure. The outer layer of the counterweight block 11 is wrapped with a magnetic insulating film 35, and only the top plane portion is exposed to the outside for contacting the electromagnet 28.

[0026] The counterweight blocks 11 have the same structural dimensions and weights. The counterweight blocks 11 are adapted to the cross-sectional shape of the bearing slots 6 . Counterweighting is achieved by accumulating and stacking a number of counterweight blocks 11 in the drop hammer 1 , and placement and removal are achieved through the loading and unloading arm 2 .

[0027] Fig.12 is a schematic structural diagram of a tractor according to an embodiment of the present invention, Fig.13 is a schematic cross-sectional view of a tractor and a guide rail according to an embodiment of the present invention, Fig.14 It is a schematic diagram of the cross-section of the guide rail of an embodiment of the present invention. The automatic traction system also includes a tractor 36, a card plate 37, and a guide rail 38. The tractor 36 is in sliding contact with the guide rail 38 through a steel wheel 39. A card head 40 is provided at the bottom of the tractor 36 to be clamped on the guide rail 38. A card slot 41 is provided at the top of the tractor 36. One end of the card plate 37 is welded to the bottom of the acceleration vehicle 4, and the other end is clamped in the card slot 41. The opening direction of the card slot 41 is consistent with the travel direction of the acceleration vehicle 4. A traction ring 42 is provided at the front end of the tractor 36, and the wire rope 13 is wound and fastened with the traction ring 42.

[0028] Fig.15 Schematic diagram of a buffer block in an embodiment of the present invention. The forced stop system includes a buffer block 43. The buffer block 43 is divided into two upper and lower blocks and is clamped on the guide rail 38 after being fastened by bolts. The middle of the buffer block 43 is in frictional contact with the guide rail 38 through a brake pad 44.

[0029] Fig.11It is a schematic diagram of the automatic rotation of the loading and unloading arm of an embodiment of the present invention. The turntable 27 is a rotating motor, and the rotation angle is controlled by the signal processor 24. When the drop hammer 1 is located in the drop hammer pit 14 and the counterweight 11 needs to be added or removed, the signal processor 24 gives a forward rotation instruction to the turntable 27, and the lifting arm 26 rotates to directly above the drop hammer 1. When the drop hammer 1 needs to be raised in height, the signal processor 24 gives a reverse rotation instruction to the turntable 27, and the lifting arm 26 rotates to the edge of the drop hammer pit 14.

[0030] The drop hammer 1 provides potential energy through its own mass and the height lifted by the tower body 3. Each type of accelerating vehicle 4 corresponds to a different mass of the drop hammer 1 and a lifting height. The relevant parameters of the drop hammer 1 and the accelerating vehicle 4 are pre-input through the operation interface 23 and stored in the PLC program. After the acceleration requirement is obtained, the relevant parameters can be directly selected on the operation interface 23, and the entire vehicle acceleration system will run automatically throughout the process until the accelerating vehicle 4 is accelerated to the specified speed.

[0031] Fig.17 It is a schematic diagram of the weight flow of the loading and unloading arm controlling the drop hammer in an embodiment of the present invention. The weight flow of the loading and unloading arm controlling the drop hammer is as follows: after receiving the instruction of the PLC operating console 22 for weight control of the drop hammer 1, the loading and unloading arm 2 controls the automatic switch 34 through the signal processor 24 so that the electromagnet 28 and the distribution box 33 are energized to obtain magnetic force. After the electromagnet 28 is energized, the magnetic force generated is used to adsorb the counterweight 11. When the counterweight 11 in the drop hammer 1 reaches the required weight, the signal processor 24 controls the automatic switch 34 so that the electromagnet 28 and the distribution box 33 are deenergized, thereby completing the weight control of the drop hammer 1 by the loading and unloading arm 2.

[0032] Fig.18 It is a schematic diagram of the acceleration process of an embodiment of the present invention, and the acceleration process is: according to the collision condition of the guardrail, the loading and unloading arm 2 is used to counterweight the weight required by the drop hammer 1 through the counterweight block 11, and then the automatic traction system lifts the drop hammer 1 to a certain height in the vertical direction of the tower body 3. The automatic traction system connects the drop hammer 1, the tower body 3, the tractor 36 and the acceleration vehicle 4 into a closed loop through the wire rope 13. The drop hammer 1 falls freely downward, and the gravitational potential energy of the drop hammer 1 is converted into the driving kinetic energy of the tractor 36 through the wire rope 13. The tractor 36 on the guide rail 38 drives the acceleration vehicle 4 forward. When the acceleration vehicle 4 reaches the specified speed, the tractor 36 contacts the buffer block 43 and is forced to stop. The acceleration vehicle 4 continues to move forward freely at the specified speed until it collides with the guardrail.

Claims

1. A vehicle acceleration system for automatically controlling the weight of a falling weight, characterized in that: The invention comprises a drop hammer (1), a loading and unloading arm (2), a tower body (3), an automatic traction system, an acceleration vehicle (4), and an emergency stop system. The drop hammer (1) comprises a box body (5), a bearing slot (6), a pressure strain gauge (7), and a wireless sensor (8). The top of the box body (5) is open. The box body (5) is divided into six independent bearing slots (6). A mounting slot (9) is arranged at the bottom of the bearing slot (6). A pressure strain gauge (7) is arranged at the bottom of the bearing slot (6), and the pressure strain gauge (7) is arranged on the mounting slot (9). The wireless sensor (8) is arranged in the mounting slot (9). The pressure strain gauge (7) is connected to the wireless sensor (8) via a data line (10); a counterweight (11) is arranged in the bearing groove (6); the pressure strain gauge (7) contacts the bottom surface of the counterweight (11) and bears pressure; the pressure strain gauge (7) senses the pressure through the weight of the counterweight (11); the pressure on the pressure strain gauge (7) forms a signal through the wireless sensor (8) and is transmitted to the wireless receiver (12) on the loading and unloading arm (2); the loading and unloading arm (2) automatically increases or decreases the counterweight (11) inside it according to the weight required by the drop hammer (1); The tower body (3) is a columnar structure. The drop weight (1) is arranged in the middle of the frame of the tower body (3). The drop weight (1) is lifted in the vertical direction of the tower body (3) by an automatic traction system. The automatic traction system connects the drop weight (1), the tower body (3) and the acceleration vehicle (4) into a closed loop through a steel wire rope (13). The gravitational potential energy of the drop weight (1) falling freely downward is converted into the driving kinetic energy of the acceleration vehicle (4) through the steel wire rope (13). When the acceleration vehicle (4) reaches a specified speed, it contacts the forced stop system, and the acceleration vehicle (4) is separated from the closed loop structure formed by the steel wire rope (13). The acceleration vehicle (4) continues to move forward freely.

2. A vehicle acceleration system for automatically controlling the weight of a falling weight according to claim 1, characterized in that: A drop hammer pit (14) is arranged in the middle of the bottom of the tower body (3). The drop hammer (1) sits in the drop hammer pit (14) when not being raised. The loading and unloading arm (2) is arranged at the edge of the drop hammer pit (14). The automatic traction system comprises a top fixed pulley (15), a drop hammer movable pulley (16), a winch (20), and a PLC operating table (22). The top fixed pulley (15) and the drop hammer movable pulley (16) are connected in series via a steel wire rope (13). The top fixed pulley (15) is arranged at the top of the tower body (3) and is fixed via a fixed pulley seat (17). The drop hammer movable pulley (16) is hinged to the drop hammer (1) via a shaft sleeve (18). The fixed pulley (15) has one more pulley plate (19) than the movable pulley (16) of the drop hammer. The wire rope (13) passes through the top fixed pulley (15) and is connected to the winch (20). The winch (20) is fixed to the side of the tower body (3) through a concrete foundation (21). The PLC operating console (22) is connected to the winch (20) through a data line (10). The PLC operating console (22) controls the start and stop of the winch (20). The PLC operating console (22) is also connected to the loading and unloading arm (2) through the data line (10). The PLC operating console (22) controls the loading and unloading arm (2) to automatically take and place the counterweight (11) into the drop hammer (1).

3. A vehicle acceleration system for automatically controlling the weight of a falling weight according to claim 2, characterized in that: The PLC operating console (22) comprises an operating interface (23) and a PLC program. The operating interface (23) can manually input the number of rotations of the winch (20), the weight, speed, acceleration distance of the accelerating vehicle (4), and the weight of the drop weight (1) corresponding to the gravitational potential energy. The PLC operating console (22) transmits the parameter information to the winch (20) and the loading and unloading arm (2) respectively through the data line (10). The winch (20) and the loading and unloading arm (2) are respectively equipped with a signal processor (24). After feedback from the signal processor (24), the number of rotations of the winch (20) realizes the lifting height control of the drop weight (1), and the loading and unloading arm (2) realizes the weight control of the drop weight (1); The hoist (20) is equipped with an electromagnetic brake disc (45). When the drop weight (1) is lifted to a specified height, the signal processor (24) instructs the electromagnetic brake disc (45) to automatically stop. When the drop weight (1) needs to fall freely, the signal processor (24) instructs the electromagnetic brake disc (45) to automatically release.

4. A vehicle acceleration system for automatically controlling the weight of a falling weight according to claim 3, characterized in that: The loading and unloading arm (2) further comprises a vertical rod base (25), a lifting arm (26), a turntable (27), an electromagnet (28), and a hoist (29). The vertical rod base (25) is vertically arranged and anchored at the edge of the hammer pit (14). The lifting arm (26) is perpendicular to the vertical rod base (25). The lifting arm (26) is rotatably connected to the vertical rod base (25) via the turntable (27). The lifting arm (26) can achieve 360° rotation relative to the vertical rod base (25) and the angle is controlled by the signal processor (24). The hoist (29) is arranged on the lifting arm (26). A slide rail (30) is arranged on the lifting arm (26). The hoist (29) can move along the slide rail (30). 30) moves to a position on the lifting arm (26), the hoist (29) is provided with a retractable steel chain (31), one end of the steel chain (31) is connected to the shaft of the lifting machine (29), and the other end is provided with an electromagnet (28), the electromagnet (28) is connected to the distribution box (33) through an electric wire (32), after the loading and unloading arm (2) receives the instruction of the PLC operating table (22) to control the weight of the drop weight (1), the electromagnet (28) obtains magnetic force by energizing the distribution box (33), and the magnetic force disappears after the power is cut off, and the energization and de-energization of the electromagnet (28) are controlled by the automatic switch (34), and the automatic switch (34) is controlled by the signal processor (24).

5. A vehicle acceleration system for automatically controlling the weight of a falling weight according to claim 4, characterized in that: The outer layer of the steel chain (31) is wrapped with a magnetic insulating film (35), and only the port connected to the electromagnet (28) is exposed to the outside. When the electromagnet (28) is energized, a magnetic force is generated to attract the counterweight (11). The counterweight (11) is a steel structure. The outer layer of the counterweight (11) is wrapped with a magnetic insulating film (35), and only the top plane portion is exposed to the outside to contact the electromagnet (28).

6. A vehicle acceleration system for automatically controlling the weight of a falling weight according to claim 5, characterized in that: The counterweight blocks (11) have the same structural dimensions and weight. The counterweight blocks (11) are adapted to the cross-sectional shape of the bearing slot (6). Counterweighting is achieved by accumulating and stacking a plurality of counterweight blocks (11) in the drop hammer (1), and placement and removal are achieved through the loading and unloading arm (2).

7. The vehicle acceleration system for automatically controlling the falling weight according to claim 1, characterized in that: The self-controlled traction system further comprises a tractor (36), a card plate (37), and a guide rail (38). The tractor (36) is in sliding contact with the guide rail (38) via a steel wheel (39). A card head (40) is provided at the bottom of the tractor (36) and is clamped on the guide rail (38). A card slot (41) is provided at the top of the tractor (36). One end of the card plate (37) is welded to the bottom of the acceleration vehicle (4), and the other end is clamped in the card slot (41). The opening direction of the card slot (41) is consistent with the traveling direction of the acceleration vehicle (4). A traction ring (42) is provided at the front end of the tractor (36), and the steel wire rope (13) is wound and fastened with the traction ring (42).

8. The vehicle acceleration system for automatically controlling the weight of a falling weight according to claim 1, characterized in that: The forced stop system comprises a buffer block (43), which is divided into two parts, an upper part and an lower part, and is clamped on the guide rail (38) after being fastened by bolts. The middle of the buffer block (43) is in frictional contact with the guide rail (38) via a brake pad (44).

9. The vehicle acceleration system for automatically controlling the falling weight according to claim 4, characterized in that: The turntable (27) is a rotary motor, and the rotation angle is controlled by a signal processor (24). When the drop hammer (1) is located in the drop hammer pit (14) and the counterweight (11) needs to be added or removed, the signal processor (24) gives a forward rotation instruction to the turntable (27), and the lifting arm (26) rotates to the top of the drop hammer (1). When the drop hammer (1) needs to be raised, the signal processor (24) gives a reverse rotation instruction to the turntable (27), and the lifting arm (26) rotates to the edge of the drop hammer pit (14).

10. The vehicle acceleration system for automatically controlling the falling weight according to claim 3, characterized in that: The drop weight (1) provides potential energy through its own mass and the height it is lifted by the tower body (3). Each type of accelerating vehicle (4) corresponds to a different mass and lifting height of the drop weight (1). Relevant parameters of the drop weight (1) and the accelerating vehicle (4) are pre-entered through an operation interface (23) and stored in a PLC program. After an acceleration requirement is obtained, relevant parameters can be directly selected on the operation interface (23). The entire vehicle acceleration system will automatically operate throughout the entire process until the accelerating vehicle (4) is accelerated to a specified speed.

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