Box girder concrete vibrating and troweling machine

Abstract

The utility model belongs to box girder concrete pouring technical field, concretely relates to a box girdr concrete vibrating and tamping finishing machine, including concrete surface travelling vehicle, and the concrete surface travelling vehicle is carried with vibrating and tamping device, vibrating and tamping device includes vibrating and tamping stick, transmission flexible axle, vibrating motor and vibrating and tamping stick retraction and extension mechanism, vibrating and tamping stick retraction and extension mechanism includes a vertical column driving sprocket, a vertical column driven sprocket and retraction and extension drive, driving sprocket and driven sprocket constitute the clamp of dynamic clamping vibrating and tamping stick, and the pivot of driving sprocket is installed with a big flywheel and a small flywheel, and the transmission direction of big flywheel and small flywheel is opposite, and the power shaft of retraction and extension drive is installed with a big sprocket and a small sprocket, wherein, big sprocket is connected with small flywheel through chain, and small sprocket is connected with big flywheel through chain, adopts big / small flywheel reverse transmission combination, realizes the switching of vibrating and tamping stick retraction and extension speed: small flywheel speed is fast and adapts vibrating and tamping stick insertion working condition, and big flywheel speed is slow and realizes vibrating and tamping stick slow recovery.

Description

Technical Field

[0001] This utility model belongs to the field of box girder concrete pouring technology, specifically relating to a box girder concrete vibratory finishing machine. Background Technology

[0002] As a core load-bearing component in bridge engineering, the quality of concrete vibration compaction in box girders directly affects the structural safety, durability, and crack resistance. Vibration operations must meet the following requirements:

[0003] (1) Compactness: It is necessary to ensure that the concrete completely fills the formwork and eliminates air bubbles and voids;

[0004] (2) The vibration range should cover the entire cross section to avoid missing vibration and causing honeycomb pitting, while preventing over-vibration from causing aggregate to sink and slurry to float and segregate.

[0005] (3) Vibration should be completed before the initial setting of concrete. The vibration time at each point should be 10-30 seconds (the standard for judgment is that the concrete surface is covered with slurry and no air bubbles escape).

[0006] Currently, box girder construction in China generally adopts manual hand-held immersion vibrator operation, following the principle of "fast insertion and slow withdrawal"; fast insertion: quickly inserting into the concrete to avoid the surface layer being compacted first and forming a barrier layer; slow withdrawal: slowly pulling out to allow the concrete to fully backfill the gaps formed by the vibrator.

[0007] Despite training, manual operation still suffers from the following key defects in actual implementation: The insertion speed is not "fast" enough; due to insufficient physical strength, workers insert the vibrator too slowly, causing premature compaction of the surface concrete and preventing internal air bubbles from escaping. The withdrawal speed is not "uniform"; the withdrawal speed is unstable, especially under fatigue, leading to accelerated withdrawal and the formation of "cavities" or "honeycombs." The rhythm is out of control; the connection between fast insertion and slow withdrawal is not smooth, and some workers, in pursuit of efficiency, insert and withdraw continuously, disrupting the flowability of the concrete. The weight of the vibrator (10-20 kg) makes it difficult for workers to maintain standard movements for extended periods, increasing deformation rates in later stages. The vibrator is not inserted vertically or the tilt angle exceeds specifications (usually required to be within ±10°), causing the effective range to shift. Insufficient insertion depth; to save effort, workers only insert the vibrator into the surface layer, failing to penetrate the current poured layer (e.g., inserting only 20 cm into a 30 cm thick layer), creating "interlayers." Utility Model Content

[0008] This invention aims to solve the problems of difficulty in ensuring standardized operation, limitations in physical strength and endurance, and angle deviation in manual handheld insertion vibratory rod operation.

[0009] This utility model provides the following technical solution: a box girder concrete vibratory finishing machine, including a concrete surface traveling vehicle, on which a vibratory device is mounted; the vibratory device includes a vibratory rod, a transmission flexible shaft, a vibratory motor, and a vibratory rod retraction and extension mechanism; the vibratory rod is connected to the vibratory motor through the transmission flexible shaft.

[0010] The vibratory rod retraction mechanism includes a vertical row of driving grooved wheels, a vertical row of driven grooved wheels, and a retraction drive; the driving grooved wheels and driven grooved wheels constitute a clamp for dynamically holding the vibratory rod;

[0011] A large flywheel and a small flywheel are mounted on the shaft of the drive wheel. The large flywheel and the small flywheel have opposite transmission directions, so that when one of them drives the drive wheel to rotate, the other spins idly. A large sprocket and a small sprocket are mounted on the drive shaft of the retraction drive. The large sprocket is connected to the small flywheel through a chain, and the small sprocket is connected to the large flywheel through a chain.

[0012] Furthermore, the concrete surface traveling vehicle is equipped with a cantilevered support, on which a first support and a second support are mounted; the driving grooved wheel is fixed on the first support; the support shaft of the driven grooved wheel is slidably fitted into the elongated hole of the second support, and spring sleeves are connected between the two ends of the support shaft and the second support, the elasticity of the spring sleeves giving the driven grooved wheel a tendency to move toward the driving grooved wheel.

[0013] Furthermore, the concrete surface traveling vehicle includes a chassis, a conveyor belt, a drive roller, and a driven roller; the drive roller and the driven roller are installed below the chassis, and the conveyor belt is looped around the drive roller and the driven roller to maintain tension.

[0014] Furthermore, a driven sprocket is mounted on the shaft of the drive roller, a travel drive is mounted on the chassis, a drive sprocket is mounted on the output shaft of the travel drive, and the drive sprocket and the driven sprocket are connected by a chain.

[0015] Furthermore, an intermediate frame is provided between the driving roller and the driven roller. The intermediate frame is connected to the chassis. There is a row of rollers at the top and a row of rollers at the bottom of the intermediate frame. The rollers are in rolling contact with the conveyor belt.

[0016] Furthermore, the concrete surface traveling vehicle is equipped with a finishing mechanism, which includes a cantilever, a trowel, and a rotary drive. The cantilever is connected to the concrete surface traveling vehicle, and the support shaft at the center of the trowel is installed in the bushing of the cantilever. A driven pulley is installed on the support shaft of the trowel, and a driving pulley is installed on the output shaft of the rotary drive. The driving pulley and the driven pulley are connected by a belt.

[0017] Furthermore, the driving and driven grooved wheels have arc-shaped grooves on their circumferences that are adapted to the vibrating rod, and rubber pads are attached inside the arc-shaped grooves.

[0018] Furthermore, the finishing mechanism and the vibrator retraction mechanism are located on the front and rear sides of the concrete surface traveling vehicle in the direction of travel.

[0019] Compared with the prior art, the advantages of this utility model are:

[0020] This utility model provides a box girder concrete vibratory finishing machine. The grooved wheel assembly uses the elasticity of a spring sleeve to dynamically clamp the vibratory rod, ensuring the vertical stability of the vibratory rod during operation and adapting to surface wear and concrete adhesion, effectively preventing the vibratory rod from falling off during operation. A combination of large and small flywheels with reverse transmission allows for switching of the vibratory rod's extension and retraction speed: the smaller flywheel rotates faster to adapt to the insertion of the vibratory rod, while the larger flywheel rotates slower to allow for slow retraction.

[0021] The combination of the troweling mechanism and the vibrating device allows for immediate smoothing of the area immediately after the vibrator finishes compaction. The elevation linkage design, where the trowel's working surface is flush with the bottom of the conveyor belt, enables the troweling pressure to automatically adjust according to the undulations of the concrete surface. Combined with the continuous feed of the traveling vehicle, this forms a closed-loop elevation control system, which is particularly suitable for the construction of large-area box girder top slabs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a concrete vibratory finishing machine for box girders.

[0023] Figure 2 This is a schematic diagram of the vibratory rod take-up and take-down mechanism;

[0024] Figure 3 This is a front view of the Geneva wheel assembly;

[0025] Figure 4 This is a side view of the Geneva wheel assembly.

[0026] In the diagram: 1-Walking drive; 2-Driven sprocket; 3-Driven roller; 4-Conveyor belt; 5-Chassis; 6-Roller; 7-Intermediate frame; 8-Driven roller; 9-Rotary drive; 10-Driven pulley; 11-Groove; 12-Busset; 13-Driven pulley; 14-Cantilever; 15-Battery pack; 16-Vibrating motor; 17-Transmission flexible shaft; 18-Cantilever support; 19-Retraction drive; 20-Power shaft; 21-Bearing frame; 22-Large sprocket; 23-Small sprocket; 24-First support; 25-Driven grooved wheel; 26-Small flywheel; 27-Large flywheel; 28-Driven grooved wheel; 29-Second support; 30-Spring sleeve; 31-Elongated hole; 32-Vibrating rod; 33-Driven sprocket. Detailed Implementation

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] like Figure 1 As shown, a box girder concrete vibratory finishing machine includes a concrete surface traveling vehicle, on which a vibratory device is mounted; the vibratory device includes a vibratory rod 32, a transmission flexible shaft 17, a vibratory motor 16, and a vibratory rod retraction mechanism; the vibratory rod 32, the transmission flexible shaft 17, and the vibratory motor 16 are existing vibrators, no different from those used manually; the vibratory motor 16 is mounted on the concrete surface traveling vehicle, and the vibratory rod 32 is connected to the vibratory motor 16 through the transmission flexible shaft 17.

[0029] like Figure 2 , Figure 3 , Figure 4 As shown: The vibratory rod retraction mechanism includes a cantilever bracket 18 and a retraction drive 19. The cantilever bracket 18 is mounted on a concrete surface traveling vehicle. A grooved wheel assembly is installed at the cantilever end of the cantilever bracket 18. The grooved wheel assembly includes two vertical rows of grooved wheels; one side has a driving grooved wheel 25, and the other side has a driven grooved wheel 28. The driving grooved wheel 25 is fixed in position on a first bracket 24, which is connected to the cantilever bracket 18. The driven grooved wheel 28 is mounted on a second bracket 29 and can move relative to the driving grooved wheel 25, approaching or moving away from the driving grooved wheel 25. The second bracket 29 is connected to the cantilever bracket 18. Both the driving and driven grooved wheels 25 and 28 have arc-shaped grooves on their circumferences that are adapted to the vibratory rod 32.

[0030] Rubber pads are attached to the arc-shaped grooves of the driving groove wheel 25 and the driven groove wheel 28 to increase the wrapping of the vibrator 32 and improve the friction.

[0031] Specifically, the support shaft of the driven grooved wheel 28 is slidably fitted into the elongated hole 31 of the second bracket 29. The two ends of the support shaft are connected to the second bracket 29 by spring sleeves 30. The elastic force of the spring sleeves 30 gives the driven grooved wheel 28 a tendency to move toward the driving grooved wheel 25, so that the driven grooved wheel 28 can cooperate with the driving grooved wheel 25 to clamp the vibrator 32.

[0032] Two freewheels (bicycle freewheels, characterized by unidirectional transmission; when pedaling forward, the bicycle freewheel drives the rear wheel; when pedaling backward, the bicycle freewheel spins freely, and the rear wheel is unaffected) are mounted on the shaft of the drive wheel 25. The two freewheels have different diameters and drive in opposite directions. Two sprockets are mounted on the drive shaft 20 of the retraction drive 19. The two sprockets also have different diameters. The larger sprocket 22 is connected to the smaller freewheel 26 on the drive wheel 25 via a chain, and the smaller sprocket 23 is connected to the larger freewheel 27 on the drive wheel 25 via a chain. The larger freewheel 27 drives counterclockwise, and the smaller freewheel 26 drives clockwise. When the retraction drive 19 rotates forward, the large sprocket 22 and chain drive the small flywheel 26 to rotate. The small flywheel 26 drives the active grooved wheel 25 to rotate clockwise, pushing the vibrating rod 32 downward. In this state, the large wheel drives the small wheel to rotate, and the rotation speed is fast, achieving "quick insertion". When the retraction drive 19 rotates in reverse, the small sprocket 23 and chain drive the large flywheel 27 to rotate. The large flywheel 27 drives the active grooved wheel 25 to rotate counterclockwise, pulling the vibrating rod 32 upward. In this state, the small wheel drives the large wheel to rotate, and the rotation speed is full, achieving "slow extraction".

[0033] When the small sprocket 23 drives the large flywheel 27 to drive the active groove wheel 25 to rotate, the large sprocket 22 drives the small flywheel 26 to idle; when the large sprocket 22 drives the small flywheel 26 to drive the active groove wheel 25 to rotate, the small sprocket 23 drives the large flywheel 27 to idle.

[0034] The retraction drive 19 is mounted on a concrete surface traveling vehicle. A bearing bracket 21 is mounted on the cantilever support 18, and the power shaft 20 of the retraction drive 19 passes through the bearing bracket 21. The retraction drive 19 is a motor with a reducer.

[0035] The concrete surface traveling vehicle includes a chassis 5, a conveyor belt 4, and two rollers mounted below the chassis 5. One roller is a drive roller 3, and the other is a driven roller 8. A driven sprocket 2 is mounted on the shaft of the drive roller 3. A travel drive 1, which is a motor with a reducer, is mounted on the chassis 5. A drive sprocket 33 is mounted on the output shaft of the travel drive 1. The drive sprocket 33 and the driven sprocket 2 are connected by a chain. The conveyor belt 4 is fitted around the drive roller 3 and the driven roller 8. When the drive roller 3 rotates, it drives the conveyor belt 4 to rotate, allowing the concrete surface traveling vehicle to move. The conveyor belt 4 increases the contact area with the concrete surface, preventing the concrete surface traveling vehicle from sinking. An intermediate frame 7 is also provided between the drive roller 3 and the driven roller 8. The intermediate frame 7 is connected to the chassis 5. There is a row of rollers 6 at the top and a row of rollers 6 at the bottom of the intermediate frame 7. The rollers 6 roll in contact with the conveyor belt 4, supporting the conveyor belt 4 and keeping the conveyor belt 4 between the drive roller 3 and the driven roller 8 taut.

[0036] The concrete surface traveling vehicle is also equipped with a finishing mechanism, which includes a cantilever 14, a trowel 11, and a rotary drive 9. The cantilever 14 is connected to the chassis 5, and the cantilever 14 and the cantilever support 18 are located on both sides of the chassis 5 (the front and rear sides of the traveling vehicle in the direction of travel). The rotary drive 9 is mounted on the chassis 5 and is also a motor with a reducer. The central support shaft of the trowel 11 is installed in the bushing 12 of the cantilever 14. A driven pulley 13 is installed on the support shaft of the trowel 11, and a driving pulley 10 is installed on the output shaft of the rotary drive 9. The driving pulley 10 and the driven pulley 13 are connected by a belt. The working surface of the trowel 11 is flush with the bottom surface of the conveyor belt 4.

[0037] The chassis 5 is also equipped with a battery pack 15, which supplies power to the vibratory motor 16, the retraction drive 19, the travel drive 1, and the slewing drive 9.

[0038] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A concrete vibratory finishing machine for box girders, characterized in that: The concrete surface traveling vehicle is equipped with a vibration device. The vibration device includes a vibrating rod (32), a transmission flexible shaft (17), a vibration motor (16), and a vibrating rod retraction mechanism. The vibrating rod (32) is connected to the vibration motor (16) through the transmission flexible shaft (17). The vibratory rod retraction mechanism includes a vertical row of active grooved wheels (25), a vertical row of driven grooved wheels (28), and a retraction drive (19); the active grooved wheels (25) and the driven grooved wheels (28) constitute a clamp for dynamically holding the vibratory rod (32); A large flywheel (27) and a small flywheel (26) are mounted on the shaft of the drive wheel (25). The drive directions of the large flywheel (27) and the small flywheel (26) are opposite, so that when one of them drives the drive wheel (25) to rotate, the other one spins freely. A large sprocket (22) and a small sprocket (23) are mounted on the power shaft (20) of the retraction drive (19). The large sprocket (22) is connected to the small flywheel (26) through a chain, and the small sprocket (23) is connected to the large flywheel (27) through a chain.

2. The box girder concrete vibratory finishing machine according to claim 1, characterized in that: The concrete surface walking vehicle is equipped with a cantilever bracket (18), and a first bracket (24) and a second bracket (29) are provided on the cantilever bracket (18); the driving groove wheel (25) is fixed on the first bracket (24); the support shaft of the driven groove wheel (28) is slidably assembled in the elongated hole (31) of the second bracket (29), and the two ends of the support shaft are connected to the second bracket (29) by spring sleeves (30), and the elastic force of the spring sleeves (30) gives the driven groove wheel (28) a tendency to move towards the driving groove wheel (25).

3. A box girder concrete vibratory finishing machine according to claim 1 or 2, characterized in that: The concrete surface walking vehicle includes a chassis (5), a conveyor belt (4), a drive roller (3) and a driven roller (8); the drive roller (3) and the driven roller (8) are installed below the chassis (5), and the conveyor belt (4) is fitted on the drive roller (3) and the driven roller (8) to keep them taut.

4. The box girder concrete vibratory finishing machine according to claim 3, characterized in that: The driven sprocket (2) is mounted on the shaft of the active roller (3), and the walking drive (1) is mounted on the chassis (5). The active sprocket (33) is mounted on the output shaft of the walking drive (1), and the active sprocket (33) and the driven sprocket (2) are connected by a chain.

5. A box girder concrete vibratory finishing machine according to claim 4, characterized in that: An intermediate frame (7) is provided between the driving roller (3) and the driven roller (8). The intermediate frame (7) is connected to the chassis (5). There is a row of rollers (6) at the top and a row of rollers (6) at the bottom of the intermediate frame (7). The rollers (6) are in rolling contact with the conveyor belt (4).

6. The box girder concrete vibratory finishing machine according to claim 1, characterized in that: The concrete surface traveling vehicle is equipped with a troweling mechanism, which includes a cantilever (14), a trowel (11), and a rotary drive (9). The cantilever (14) is connected to the concrete surface traveling vehicle. The support shaft at the center of the trowel (11) is installed in the bushing (12) of the cantilever (14). A driven pulley (13) is installed on the support shaft of the trowel (11). A drive pulley (10) is installed on the output shaft of the rotary drive (9). The drive pulley (10) and the driven pulley (13) are connected by a belt.

7. A box girder concrete vibratory finishing machine according to claim 2, characterized in that: The active groove wheel (25) and the driven groove wheel (28) have arc-shaped grooves on their circumferences that are adapted to the vibrating rod (32), and rubber pads are attached inside the arc-shaped grooves.

8. A box girder concrete vibratory finishing machine according to claim 6, characterized in that: The surface finishing mechanism and the vibratory rod retraction mechanism are located on the front and rear sides of the concrete surface traveling vehicle in the direction of travel.

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