A concrete trowel

Abstract

This utility model relates to the field of construction machinery technology, and in particular to a concrete trowel, comprising a support plate, a hinge seat fixedly installed on the top of the support plate, a support rod hinged inside the hinge seat, a handle fixedly connected to the end of the support rod away from the hinge seat, a connecting plate fixedly connected to the outer wall of the support rod, and a support assembly fixedly connected to the side of the connecting plate away from the support rod. The support assembly includes an mounting plate fixedly installed on the side of the connecting plate away from the support rod, and a through groove is opened through the top of the mounting plate, in which the support rod is slidably connected. When the handle of this device is accidentally released, the support roller first contacts the ground, and the support rod slides and rubs in the groove of the mounting plate to achieve initial buffering. The impact force is dispersed by the spring, and the mounting plate continues to press down. The rubber airbag expands and contracts after being compressed to buffer the impact force, thereby achieving the effect of buffering the impact force of the handle being released and protecting the user's physical safety.

Description

Technical Field

[0001] This utility model relates to the field of construction machinery technology, and in particular to a concrete troweling machine. Background Technology

[0002] Concrete is a composite material made by mixing cement, aggregates (such as sand and gravel), water, and, when necessary, admixtures and additives in a certain proportion. It is suitable for construction, bridges, roads and other engineering projects. It can resist environmental erosion and extend service life. Concrete is one of the most commonly used materials in modern construction engineering and is widely used in various infrastructure and civil buildings.

[0003] Working principle of concrete trowel: The engine or motor drives the trowel rotor to rotate through the belt or gear. The trowel tilt angle is consistent with the rotation direction, forming centrifugal force to compact the concrete surface. The disc trowel rotates at high speed, lifting the slurry and initially compacting the concrete, eliminating air bubbles and voids. The blade trowel is adjusted to a low speed and a high tilt angle, which refines the surface texture and improves the density through the turbulence effect.

[0004] Traditional concrete trowels are mainly controlled by the operator manually holding the handle. However, during construction, the handle is easily slipped out of the hand due to operational errors or uneven ground. After slipping, the equipment may tip over or move out of control due to inertia or the rotational torque of the trowel blade, making it difficult for the operator to quickly regain control. In addition, the existing support mechanism's limit rod and spring friction generates heat, accelerating component aging and shortening service life. For example, the trowel disclosed in patent CN222275174U uses a spring support roller structure, but it only absorbs impact through the spring and does not solve the problems of thermal fatigue and insufficient buffering force. This utility model systematically optimizes safety and durability through a spring-airbag composite buffer system and air-cooled heat dissipation design. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a concrete troweling machine, which solves the technical problems mentioned in the background art.

[0007] (II) Technical Solution

[0008] To solve the above technical problems, the present invention provides the following technical solution: a concrete trowel, including a support plate, a hinge seat is fixedly installed on the top of the support plate, a support rod is hinged inside the hinge seat, a handle is fixedly connected to the end of the support rod away from the hinge seat, a connecting plate is fixedly connected to the outer side wall of the support rod, and a support component is fixedly connected to the side of the connecting plate away from the support rod.

[0009] The support assembly includes a mounting plate fixedly installed on the side of the connecting plate away from the support rod. A through groove is opened through the top of the mounting plate, and a support rod is slidably connected in the through groove. A spring is sleeved on the outer wall of the support rod. A bracket is fixedly connected to the end of the support rod away from the mounting plate. The bracket is U-shaped. Several support rollers are rotatably connected to the side of the bracket away from the support rod. An airbag assembly is fixedly connected between the bracket and the mounting plate.

[0010] The airbag assembly includes a pressure plate fixedly mounted on the upper surface of the bracket. A shaft cylinder is fixedly connected to the side of the pressure plate away from the bracket, and a movable shaft is slidably connected to the inner wall of the shaft cylinder.

[0011] A return spring is fitted on the outer wall of the shaft cylinder. An upper pressure plate is fixedly connected to the end of the movable shaft away from the shaft cylinder. The side of the upper pressure plate away from the movable shaft is fixedly connected to the bottom of the mounting plate.

[0012] A rubber airbag is fixedly connected between the upper pressure plate and the lower pressure plate. Two ventilation slots are opened through the outer wall of the rubber airbag, and ventilation pipes are fixedly connected to the inner wall of the ventilation slots.

[0013] A protective frame is fixedly connected to the outer wall of the support plate, and a drive motor is fixedly installed on the upper surface of the support plate. A connecting shaft is rotatably connected to the side of the support plate away from the drive motor, and the side of the connecting shaft close to the support plate is fixedly connected to the output end of the drive motor.

[0014] Several cross arms are fixedly connected to the outer wall of the connecting shaft. The cross arms are arranged in a circular array with the connecting shaft as the center. A T-shaped groove is opened on the outer wall of the cross arm, and a T-shaped plate is slidably connected to the inner wall of the T-shaped groove.

[0015] The T-shaped plate is fixed in the T-slot by bolts. A trowel is fixedly connected to the side of the T-shaped plate away from the cross arm. An extension support plate is fixedly connected to the outer wall of the support plate. A hinge seat is fixedly connected to the top of the extension support plate.

[0016] An electric telescopic rod is hinged to the inner wall of the second hinge seat, and a connecting rod is fixedly connected to the outer wall of the support rod. The end of the electric telescopic rod away from the second hinge seat is fixedly connected to the outer wall of the connecting rod.

[0017] The beneficial effects of this utility model are:

[0018] 1. When the handle of this device is accidentally released, the support roller first contacts the ground, and the support rod slides and rubs in the groove of the mounting plate to achieve initial buffering. The spring absorbs the impact force, forcing the mounting plate to continue to press down. After being compressed, the rubber airbag expands and contracts to perform secondary buffering to further attenuate the impact force. This achieves the effect of buffering the impact force of the handle being released and protects the user's physical safety.

[0019] 2. When the mounting plate of this device is pressed down, the rubber airbag contracts under pressure, and the internal gas is discharged at high speed through the ventilation pipe. The airflow directly washes the spring and the sliding friction surface between the support rod and the mounting plate to dissipate heat, avoiding thermal fatigue caused by sliding friction between the support rod and the mounting plate, and ensuring the cushioning effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments 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. Among them:

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the support component structure of this utility model.

[0023] Figure 3 This is a schematic diagram of the connecting shaft structure of this utility model.

[0024] Figure 4 This is a schematic diagram of the airbag assembly structure of this utility model.

[0025] In the diagram: 1. Support plate; 2. Protective frame; 3. Drive motor; 4. Electric telescopic rod; 5. Extension support plate; 6. Support rod; 7. Handle; 8. Connecting plate; 9. Support assembly; 901. Bracket; 902. Support roller; 903. Mounting plate; 904. Spring; 905. Support rod; 10. Airbag assembly; 1001. Upper pressure plate; 1002. Air exchange pipe; 1003. Movable shaft; 1004. Rubber airbag; 1005. Shaft cylinder; 1006. Lower pressure plate; 11. Connecting shaft; 12. Cross arm; 13. T-slot; 14. T-plate; 15. Polishing plate. Detailed Implementation

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] Example 1

[0028] Reference Figure 1-4This is the first embodiment of the present invention, which provides a concrete trowel machine, including a support plate 1. A hinge seat is fixedly installed on the top of the support plate 1. A support rod 6 is hinged in the hinge seat. A handle 7 is fixedly connected to the end of the support rod 6 away from the hinge seat. A connecting plate 8 is fixedly connected to the outer wall of the support rod 6. A support assembly 9 is fixedly connected to the side of the connecting plate 8 away from the support rod 6. The support assembly 9 includes an installation plate 903 fixedly installed on the side of the connecting plate 8 away from the support rod 6. A through groove is opened through the top of the installation plate 903. A support rod 905 is slidably connected in the through groove. A spring 904 is sleeved on the outer wall of the support rod 905.

[0029] A bracket 901 is fixedly connected to the end of the support rod 905 away from the mounting plate 903. The bracket 901 is U-shaped. Several support rollers 902 are rotatably connected to the side of the bracket 901 away from the support rod 905. An airbag assembly 10 is fixedly connected between the bracket 901 and the mounting plate 903. The airbag assembly 10 includes a lower pressure plate 1006 fixedly installed on the upper surface of the bracket 901. A shaft cylinder 1005 is fixedly connected to the side of the lower pressure plate 1006 away from the bracket 901. A movable shaft 1003 is slidably connected to the inner wall of the shaft cylinder 1005. A return spring is sleeved on the outer wall of the shaft cylinder 1005. The return spring is only used for the return of the airbag 1004. An upper pressure plate 1001 is fixedly connected to the end of the movable shaft 1003 away from the shaft cylinder 1005. The side of the upper pressure plate 1001 away from the movable shaft 1003 is fixedly connected to the bottom of the mounting plate 903.

[0030] Example 2

[0031] Reference Figure 1-4 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: a rubber airbag 1004 is fixedly connected between the upper pressure plate 1001 and the lower pressure plate 1006. Two ventilation slots are opened through the outer wall of the rubber airbag 1004. A ventilation pipe 1002 is fixedly connected to the inner wall of the ventilation slot. A filter screen is installed on the outer wall of the ventilation pipe 1002. The outlet of the ventilation pipe 1002 faces the sliding contact surface of the support rod 905 to form directional air cooling. A protective frame 2 is fixedly connected to the outer wall of the support plate 1. A drive motor 3 is fixedly installed on the upper surface of the support plate 1. A connecting shaft 11 is rotatably connected to the side of the support plate 1 away from the drive motor 3. The side of the connecting shaft 11 close to the support plate 1 is fixedly connected to the output end of the drive motor 3.

[0032] Several cross arms 12 are fixedly connected to the outer wall of the connecting shaft 11. The cross arms 12 are arranged in a circular array with the connecting shaft 11 as the center. A T-slot 13 is opened on the outer wall of the cross arm 12. A T-plate 14 is slidably connected to the inner wall of the T-slot 13. The T-plate 14 is fixed in the T-slot 13 by bolts. A polishing plate 15 is fixedly connected to the side of the T-plate 14 away from the cross arm 12. An extension support plate 5 is fixedly connected to the outer wall of the support plate 1. A hinge seat 2 is fixedly connected to the top of the extension support plate 5. An electric telescopic rod 4 is hinged to the inner wall of the hinge seat 2. The electric telescopic rod 4 is connected to the controller signal and supports automatic height adjustment. A connecting rod is fixedly connected to the outer wall of the support rod 6. The end of the electric telescopic rod 4 away from the hinge seat 2 is fixedly connected to the outer wall of the connecting rod.

[0033] The remaining structure is the same as that in Example 1.

[0034] During use, start the electric telescopic rod 4, which pushes the support rod 6 to rotate around the hinge seat. Adjust the handle 7 to the operator's waist height, loosen the bolts of the T-slot 13, slide the T-plate 14 to the target radius (adaptive range 0.5-1.2m), tighten the bolts to fix the trowel 15, turn on the drive motor 3, and the motor output shaft drives the connecting shaft 11 and the cross arm 12 to rotate (speed 1500-2000r / min). The trowel 15 compacts the concrete surface. The operator holds the handle 7 and pushes the equipment to move smoothly along the construction path. The protective frame 2 blocks splashed slurry.

[0035] When handle 7 is accidentally released, support roller 902 contacts the ground, spring 904 compresses to absorb the initial impact force, mounting plate 903 continues to press down, rubber airbag 1004 contracts under pressure, and internal gas is discharged at high speed through ventilation pipe 1002 (flow rate ≥2m / s). The airflow directly washes over spring 904 and the sliding friction surface between support rod 905 and mounting plate 903, cooling down by 20-40℃. After the impact, reset spring pushes movable shaft 1003 back to its original position, rubber airbag 1004 returns to its original state, and operator can grip handle 7 again to continue working. Clean residual mortar on polishing plate 15 daily, check ventilation pipe 1002 for unobstructed flow to ensure heat dissipation efficiency, apply high-temperature grease to spring 904 every 500 hours, and replace rubber airbag 1004 every 1000 hours.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A concrete trowel, characterized by: The system includes a support plate, a hinge seat 1 fixedly installed on the top of the support plate, a support rod hinged inside the hinge seat 1, a handle fixedly connected to the end of the support rod away from the hinge seat 1, a connecting plate fixedly connected to the outer side wall of the support rod, and a support assembly fixedly connected to the side of the connecting plate away from the support rod. The support assembly includes a mounting plate fixedly installed on the side of the connecting plate away from the support rod. A through groove is opened through the top of the mounting plate, and a support rod is slidably connected in the through groove. A spring is sleeved on the outer wall of the support rod. A bracket is fixedly connected to the end of the support rod away from the mounting plate. The bracket is U-shaped. Several support rollers are rotatably connected to the side of the bracket away from the support rod. An airbag assembly is fixedly connected between the bracket and the mounting plate.

2. The concrete trowel machine of claim 1, wherein: The airbag assembly includes a lower pressure plate fixedly mounted on the upper surface of the bracket. A shaft cylinder is fixedly connected to the side of the lower pressure plate away from the bracket, and a movable shaft is slidably connected to the inner wall of the shaft cylinder.

3. The concrete trowel machine of claim 2, wherein: A return spring is fitted on the outer wall of the shaft cylinder. An upper pressure plate is fixedly connected to the end of the movable shaft away from the shaft cylinder. The side of the upper pressure plate away from the movable shaft is fixedly connected to the bottom of the mounting plate.

4. The concrete trowel machine of claim 3, wherein: A rubber airbag is fixedly connected between the upper pressure plate and the lower pressure plate. Two ventilation slots are opened through the outer wall of the rubber airbag, and ventilation pipes are fixedly connected to the inner wall of the ventilation slots.

5. The concrete trowel machine of claim 1, wherein: A protective frame is fixedly connected to the outer wall of the support plate, and a drive motor is fixedly installed on the upper surface of the support plate. A connecting shaft is rotatably connected to the side of the support plate away from the drive motor, and the side of the connecting shaft close to the support plate is fixedly connected to the output end of the drive motor.

6. The concrete trowel machine of claim 5, wherein: Several horizontal arms are fixedly connected to the outer wall of the connecting shaft. The horizontal arms are arranged in a circular array with the connecting shaft as the center. A T-shaped groove is opened on the outer wall of the horizontal arm, and a T-shaped plate is slidably connected to the inner wall of the T-shaped groove.

7. The concrete trowel machine of claim 6, wherein: The T-shaped plate is fixed in the T-slot by bolts. A polishing plate is fixedly connected to the side of the T-shaped plate away from the cross arm. An extension support plate is fixedly connected to the outer wall of the support plate. A hinge seat is fixedly connected to the top of the extension support plate.

8. The concrete trowel machine of claim 7, wherein: An electric telescopic rod is hinged to the inner wall of the second hinge seat, and a connecting rod is fixedly connected to the outer wall of the support rod. The end of the electric telescopic rod away from the second hinge seat is fixedly connected to the outer wall of the connecting rod.

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