Drop hammer type bridge automatic excitation trolley

Abstract

The utility model relates to a drop hammer type bridge automatic excitation trolley, and relates to the technical field of bridge and engineering structure detection. Comprising trundles, a frame, a bottom plate, a frame body, a dynamic load loading mechanism, an anti-resonance mechanism, a force hammer, a vehicle body fixing device, a controller and a vehicle-mounted power supply, the trundles are installed at the bottom end of the frame, the bottom plate is installed at the top end of the frame, and the frame body is installed on the bottom plate. The force hammer is mounted on the bottom plate, and the dynamic load loading mechanism is mounted on the frame body; the anti-resonance mechanism is mounted on the frame body, and the output end is connected with the force hammer; the vehicle body fixing device is mounted on the bottom plate; the controller and the vehicle-mounted power source are both installed at the top end of the bottom plate, and the dynamic load loading mechanism, the anti-resonance mechanism, the vehicle body fixing device and the vehicle-mounted power source are all electrically connected with the controller. According to the utility model, while the drop hammer is ensured to effectively excite the bridge, the resonance excitation generated by secondary and more impact of the drop hammer can be prevented, and not only can an approximately horizontal bridge floor be excited, but also a gradient bridge floor and a large-radian curved surface bridge floor can be excited.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge and engineering structure detection, in particular to a drop-hammer type automatic excitation trolley for bridges. Background Art

[0002] In order to evaluate the working performance and bearing capacity of the bridge, it is necessary to conduct non-destructive testing on the bridge, one of the testing contents is to measure the structural dynamic parameters of the bridge, such as frequency, damping and vibration mode, etc. By comparing these parameters at different service periods, the dynamic performance changes of the bridge structure can be analyzed, the working performance and bearing capacity of the bridge can be evaluated, the traffic capacity of the bridge can be assessed, and maintenance or reinforcement measures can be taken.

[0003] In order to measure the structural dynamic parameters of the bridge, it is necessary to excite the bridge structure. The existing excitation methods for structural dynamic parameter detection generally include: environmental excitation method (also known as earth pulsation method), vehicle vibration method (the vehicle passes through the bridge at a certain speed, which can be divided into running car excitation, jumping excitation and braking excitation, etc.), force hammer excitation method and drop hammer impact excitation method.

[0004] The environmental excitation method uses the pulsation of the earth to excite the bridge micro-vibration, which can generally only excite the fundamental frequency. In the vehicle vibration method, when the sports car is excited, the bridge has a small amplitude and decays quickly; when the vehicle jumps over the wedge-shaped obstacle 15cm high at a certain speed, the wheels hit the bridge deck, which has a great potential harm to the old bridge; and the result of the braking excitation is similar to this, which is to use the braking force generated when the moving vehicle brakes at a specific position on the bridge to excite the bridge, which will cause certain damage to the vehicle itself, and the potential harm to the old bridge with unknown characteristics is also great.

[0005] In actual use, engineers often use hammers to excite bridges. The advantages of this method are simple installation, low cost, easy operation and portability; but it also has obvious shortcomings:

[0006] It requires manual operation, has a large impact from human factors, and the incentives cannot be kept consistent;

[0007] Limited by human strength, it is impossible to exert an excitation force that exceeds human strength;

[0008] The degree of mechanization and automation is low, the labor intensity is high and the efficiency is low.

[0009] Another commonly used typical bridge excitation method is the drop hammer excitation method, which uses a mechanical device to hit the bridge deck, avoiding the transitional damage and danger of vehicles passing through the bridge, and can overcome the shortcomings of manual force hammer excitation bridges. However, it still has certain limitations in use:

[0010] (1) The drop hammer relies on potential energy to do work. The drop hammer excitation device can only excite vertically or approximately vertically, and can only hit the horizontal bridge surface but cannot effectively excite the slope section of the bridge;

[0011] (2) Since the whole device is large in size, it will affect its use in a narrow space.

[0012] (3) Under the action of gravity, the falling weight and the bridge deck will experience resonant excitation due to multiple impacts more than twice, which will affect the excitation detection data of the damaged bridge and the evaluation results of the bridge status.

[0013] (4) When the bridge is already damaged, there is a great risk of excitation by a large-mass excitation device on the bridge. Utility Model Content

[0014] The technical problem solved by the utility model is to overcome the deficiencies of the prior art and provide a drop-hammer type automatic bridge excitation trolley. The entire device is small in size and can be used in a narrow small space working environment. While ensuring that the drop hammer effectively excites the bridge, it can prevent the resonant excitation caused by the secondary and above impacts of the drop hammer, and can not only excite approximately horizontal bridge decks, but also sloped bridge decks and large curved bridge decks.

[0015] To achieve the above-mentioned purpose, the utility model provides a drop-hammer type bridge automatic excitation trolley, including: casters, a frame, a base plate, a frame body, a dynamic load loading mechanism, an anti-resonance mechanism, a force hammer, a vehicle body fixing device, a controller and an on-board power supply; the casters are installed at the bottom end of the frame, the base plate is installed at the top end of the frame, and the frame body is installed on the base plate; the force hammer is installed on the base plate, and the dynamic load loading mechanism is installed on the frame body for lifting and releasing the force hammer; the anti-resonance mechanism is installed on the frame body, and the output end is connected to the force hammer; the vehicle body fixing device is installed on the base plate, and is used for lifting and leveling the drop-hammer type automatic excitation trolley; the controller and the on-board power supply are both installed at the top end of the base plate, and the dynamic load loading mechanism, the anti-resonance mechanism, the vehicle body fixing device and the on-board power supply are all electrically connected to the controller.

[0016] Furthermore, the force hammer includes two parallel guide columns, a drop hammer fixing plate, a drop hammer, a force sensor and a wireless transmission module; the drop hammer fixing plate is arranged between the two guide columns and is slidably connected to the guide columns; the drop hammer is fixedly mounted on the drop hammer fixing plate, the force sensor is mounted on the hammer head end close to the drop hammer, the wireless transmission module is mounted on the drop hammer fixing plate, and the force sensor is electrically connected to the controller through the wireless transmission module.

[0017] Furthermore, the dynamic load loading mechanism includes a drop hammer lifting motor, two transmission devices, two parallel ball screws, a slider, a clutch fixing plate and a clutch; the drop hammer lifting motor is installed on the top of the frame, the two transmission devices are installed on the frame, and one end is respectively connected to the output end of the drop hammer lifting motor, and the other end is respectively connected to the ball screw, the slider is threadedly connected to the ball screw, the clutch fixing plate is connected between the two sliders, and the clutch is installed at the bottom of the clutch fixing plate for adsorbing and releasing the drop hammer fixing plate.

[0018] Furthermore, the anti-resonance mechanism includes an anti-resonance motor, a transmission belt and a photoelectric detection module; the anti-resonance motor is installed on the frame, the output end of the anti-resonance motor is connected to a pulley group, one end of the transmission belt is connected to the pulley group, and the other end is connected to the drop hammer fixing plate, and the photoelectric detection module is installed on the frame to detect whether the force hammer passes through the detection area.

[0019] Furthermore, the vehicle body fixing device includes a lifting device, an adjustment motor and a circular fixing plate; the adjustment motor is installed on the base plate, the output end of the adjustment motor is transmission-connected to the lifting device, and the circular fixing plate is installed at the bottom end of the lifting device.

[0020] Furthermore, the lifting device adopts a worm gear lifting mechanism.

[0021] Furthermore, a traction device is installed at one end of the base plate.

[0022] Furthermore, a canopy is installed on the top of the base plate.

[0023] The beneficial effects of the utility model are:

[0024] The utility model provides a drop-hammer type automatic bridge excitation trolley. The whole device is small in size and can be used in a narrow small space working environment. While ensuring that the drop hammer effectively excites the bridge, it can prevent the resonant excitation caused by the secondary and above impacts of the drop hammer, and it can not only excite approximately horizontal bridge decks, but also sloped bridge decks and large-arc curved bridge decks. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0026] Figure 2 It is the front view of the utility model.

[0027] Among them, in the figure:

[0028] 1-castor mechanism, 2-base plate, 3-lifting device, 4-adjustment motor, 5-vehicle power supply, 6-hammer guide shaft, 7-drop hammer fixing plate, 8-ball screw, 9-drop hammer lifting motor, 10-transmission device, 11-anti-resonance motor, 12-transmission belt, 13-clutch fixing plate, 14-clutch, 15-drop hammer, 16-photoelectric detection module, 17-controller, 18-traction device, 19-frame, 20-force sensor; 21-wireless transmission module; 22-hammer; 23-dynamic load loading mechanism; 24-body fixing device; 25-anti-resonance mechanism; 26-frame. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0032] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0033] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] like Figure 1-2 As shown, the utility model provides a drop-hammer type bridge automatic excitation trolley, comprising: a caster 1, a frame 19, a bottom plate 2, a frame body 26, a dynamic load loading mechanism 23, an anti-resonance mechanism 25, a force hammer 22, a vehicle body fixing device 24, a controller 17 and a vehicle-mounted power supply 5; the caster 1 is installed at the bottom end of the frame 19 to realize the free movement of the drop-hammer type automatic excitation trolley; the bottom plate 2 is installed at the top end of the frame 19, and the bottom plate 2 serves as the main load-bearing part of the trolley; the frame body 26 is installed on the bottom plate 2; the force hammer 22 is installed On the base plate, the dynamic load loading mechanism 23 is installed on the frame 26, and is used to lift and release the hammer 22; the anti-resonance mechanism 25 is installed on the frame 26, and the output end is connected to the hammer 22; the vehicle body fixing device 24 is installed on the base plate 2, and is used for the lifting and leveling of the drop hammer type automatic excitation trolley; the controller 17 and the vehicle power supply 5 are both installed on the top of the base plate 2, and the dynamic load loading mechanism 23, the anti-resonance mechanism 25, the vehicle body fixing device 24 and the vehicle power supply 5 are all electrically connected to the controller 17.

[0035] The utility model provides a drop-hammer type automatic bridge excitation trolley, which has a simple structure, convenient excitation operation, small device size, light excitation component mass, large excitation energy, can realize bridge excitation, is convenient for long-distance transportation and short-distance low-speed movement, can be used in a narrow small space working environment, and can prevent resonant excitation caused by secondary and above impacts of the drop hammer while ensuring that the drop hammer effectively excites the bridge, and can not only excite approximately horizontal bridge decks, but also slope bridge decks and large-arc curved bridge decks; in addition, by controlling relevant parameters of the excitation system, the bridge can be excited with variable frequency and amplitude.

[0036] The force hammer 22 includes two parallel guide columns 6, a drop hammer fixing plate 7, a drop hammer 15, a force sensor 20 and a wireless transmission module 21; the drop hammer fixing plate 7 is arranged between the two guide columns 6, and is slidably connected to the guide columns 6 through guide holes on both sides, and the guide holes are built with oil-free bushings to reduce friction to achieve lubrication, and the interference part between the drop hammer fixing plate 7 and the ball screw 8 is punched to avoid interference while reducing weight; the drop hammer 15 is fixedly installed on the drop hammer fixing plate 7 by a threaded connection, and the force sensor 20 is installed at the hammer head end close to the drop hammer 15 to detect the excitation force of the drop hammer 15 in real time; the wireless transmission module 21 is installed on the drop hammer fixing plate 7, and the force sensor 20 is electrically connected to the controller 17 through the wireless transmission module 21 so that the force sensor and the controller 17 can communicate.

[0037] The dynamic load loading mechanism 23 includes a drop hammer lifting motor 9, two transmission devices 10, two parallel ball screws 8, a slider, a clutch fixing plate 13 and a clutch 14; the drop hammer lifting motor 9 is mounted on the top of the frame 26, the two transmission devices 10 are mounted on the frame, and one end is respectively connected to the output end of the drop hammer lifting motor 9, and the other end is respectively connected to the ball screw 8, the slider is threadedly connected to the ball screw 8, the clutch fixing plate 13 is connected between the two sliders, and the clutch 14 is mounted at the bottom of the clutch fixing plate 13, which is used to adsorb and release the drop hammer fixing plate 7. In order to complete the lifting and release of the drop hammer 15, the drop hammer lifting motor 9 can drive the ball screw 8 to rotate through the transmission device 10 to realize the lifting and lowering of the clutch 14, the clutch 14 adsorbs the drop hammer fixing plate 7, and the two can adjust the height together, the clutch 14 releases the drop hammer fixing plate 7, and the drop hammer 15 performs free fall along the drop hammer guide column 6 to achieve the excitation of the bridge.

[0038] The anti-resonance mechanism 25 includes an anti-resonance motor 11, a transmission belt 12 and a photoelectric detection module 16; the anti-resonance motor 11 is installed on the frame 26, the output end of the anti-resonance motor 11 is connected to a pulley block, one end of the transmission belt is connected to the pulley block, and the other end is connected to the drop hammer fixing plate 7, and the photoelectric detection module 16 is installed on the frame 26 to detect whether the hammer 22 passes through the detection area. In the process of the hammer 22 making a free fall along the guide column 6 to excite the bridge, when the photoelectric detection module 16 detects that the drop hammer 15 passes through the detection area, it is immediately transmitted to the signal controller 17, and the controller 7 issues an instruction to start the anti-resonance motor 11 to achieve that when the hammer 22 completes one excitation of the bridge and bounces up, the anti-resonance motor 11 lifts the hammer 22 in real time through the transmission belt 12 to prevent the hammer 22 from falling again to generate more than two resonance excitations. The force sensor 20 detects the excitation force of the hammer 22 in real time and transmits it to the controller 17 through the wireless transmission module 21.

[0039] The relationship between the hammer and the impact energy is as follows:

[0040] E h =mgh

[0041] Where: E h is the energy of the hammer hitting the bridge deck J; m is the equivalent mass of the hammer kg; g is the acceleration due to gravity m / s 2 ; h is the height of the dropped weight to the bridge deck in m.

[0042] The vehicle body fixing device 24 includes a lifting device 3, an adjustment motor 4 and a circular fixing plate; the adjustment motor 4 is installed on the bottom plate 2, the output end of the adjustment motor 4 is connected to the lifting device 3 in a transmission manner, and the circular fixing plate is installed at the bottom end of the lifting device 3 to play a buffering role. Before the bridge excitation test, the lifting and lowering of the four vehicle body fixing devices 24 are adjusted by the controller 17, and the lifting and leveling of the drop hammer type automatic excitation trolley are adjusted. When the drop hammer type automatic excitation trolley is raised to a small height and the base surface of the bottom plate 2 and the bridge deck are parallel, it is fixed to provide a stable test platform for the drop hammer excitation; the designed drop hammer fixing plate 7 must be guided down along the drop hammer guide column 6, and the drop hammer guide column 6 is perpendicular to the base surface of the bottom plate 2. The force hammer 22 can not only excite the approximately horizontal bridge deck, but also can realize the excitation of the slope bridge deck and the large arc curved bridge deck.

[0043] According to a further optimization scheme, the lifting device 3 adopts a worm gear lifting mechanism.

[0044] As a further optimization scheme, a traction device 18 is installed at one end of the base plate 2 to facilitate the close-range and low-speed towing movement of the drop-hammer type automatic excitation trolley.

[0045] According to a further optimization scheme, a canopy is installed on the top of the base plate 2.

[0046] The present invention adopts a guide column to guide the drop hammer, so that the force hammer can realize vertical excitation not only for approximately horizontal bridge decks, but also for sloped bridge decks and large arc bridge decks; the adjustment motor is adopted to lift and fix the drop hammer type automatic excitation trolley, which is beneficial to improve the stability during excitation; the photoelectric detection module and the anti-resonance motor linkage mode are adopted to realize the prevention of secondary resonance of the force hammer; the controller automatically controls the lifting height of the force hammer and the time interval for the next bridge excitation, and can control the impact energy, impact speed, excitation force amplitude and impact frequency of the pendulum, so as to realize variable frequency and variable amplitude excitation of the pendulum to the bridge, and the degree of automation is high; and the present invention can also realize long-distance vehicle transportation and short-distance low-speed traction movement.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A drop-hammer bridge automatic excitation trolley, characterized in that: include: A caster (1), a frame (19), a base plate (2), a frame body (26), a dynamic load loading mechanism (23), an anti-resonance mechanism (25), a force hammer (22), a vehicle body fixing device (24), a controller (17) and a vehicle-mounted power supply (5); the caster (1) is mounted on the bottom end of the frame (19), the base plate (2) is mounted on the top end of the frame (19), and the frame body (26) is mounted on the base plate (2); the force hammer (22) is mounted on the base plate, and the dynamic load loading mechanism (23) is mounted on the frame body (26). ) for lifting and releasing the force hammer (22); the anti-resonance mechanism (25) is installed on the frame (26), and the output end is connected to the force hammer (22); the vehicle body fixing device (24) is installed on the base plate (2) for lifting and leveling the drop hammer type automatic excitation trolley; the controller (17) and the vehicle power supply (5) are both installed on the top of the base plate (2), and the dynamic load loading mechanism (23), the anti-resonance mechanism (25), the vehicle body fixing device (24) and the vehicle power supply (5) are all electrically connected to the controller (17).

2. A drop-weight bridge automatic excitation trolley as claimed in claim 1, characterized in that: The force hammer (22) comprises two parallel guide columns (6), a drop hammer fixing plate (7), a drop hammer (15), a force sensor (20) and a wireless transmission module (21); the drop hammer fixing plate (7) is arranged between the two guide columns (6) and is slidably connected to the guide columns (6); the drop hammer (15) is fixedly mounted on the drop hammer fixing plate (7), the force sensor (20) is mounted at a hammer head end close to the drop hammer (15), the wireless transmission module (21) is mounted on the drop hammer fixing plate (7), and the force sensor (20) is electrically connected to the controller (17) via the wireless transmission module (21).

3. A drop-weight bridge automatic excitation trolley as claimed in claim 2, characterized in that: The dynamic load loading mechanism (23) comprises a drop hammer lifting motor (9), two transmission devices (10), two parallel ball screws (8), a slider, a clutch fixing plate (13) and a clutch (14); the drop hammer lifting motor (9) is mounted on the top of the frame (26), the two transmission devices (10) are mounted on the frame, and one end is respectively connected to the output end of the drop hammer lifting motor (9), and the other end is respectively connected to the ball screw (8), the slider is threadedly connected to the ball screw (8), the clutch fixing plate (13) is connected between the two sliders, and the clutch (14) is mounted on the bottom of the clutch fixing plate (13) for adsorbing and releasing the drop hammer fixing plate (7).

4. A drop-weight bridge automatic excitation trolley as claimed in claim 3, characterized in that: The anti-resonance mechanism (25) comprises an anti-resonance motor (11), a transmission belt (12) and a photoelectric detection module (16); the anti-resonance motor (11) is mounted on the frame (26); the output end of the anti-resonance motor (11) is connected to a pulley block; one end of the transmission belt is connected to the pulley block, and the other end is connected to the drop hammer fixing plate (7); the photoelectric detection module (16) is mounted on the frame (26) and is used to detect whether the force hammer (22) passes through a detection area.

5. A drop-weight bridge automatic excitation trolley as claimed in claim 4, characterized in that: The vehicle body fixing device (24) comprises a lifting device (3), an adjustment motor (4) and a circular fixing plate; the adjustment motor (4) is mounted on the base plate (2), the output end of the adjustment motor (4) is transmission-connected to the lifting device (3), and the circular fixing plate is mounted at the bottom end of the lifting device (3).

6. A drop-weight bridge automatic excitation trolley as claimed in claim 5, characterized in that: The lifting device (3) adopts a worm gear lifting mechanism.

7. The drop-weight bridge automatic excitation trolley according to claim 1, characterized in that: A traction device (18) is installed at one end of the base plate (2).

8. The drop-weight bridge automatic excitation trolley as claimed in claim 1, characterized in that: A canopy is installed on the top of the base plate (2).

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