A multi-motor vibratory box for a pile driver

Abstract

This utility model relates to a multi-motor vibratory box for pile drivers, belonging to the technical field of pile driver equipment, and solves the technical problems of large load and severe heat generation in traditional vibratory boxes with gear transmission. It includes a vibratory box body, a drive motor, and at least one pair of eccentric block assemblies. Each eccentric block assembly includes a rotating shaft, eccentric blocks fixedly mounted on the shaft, and a synchronous gear. Each rotating shaft is equipped with a drive motor, and the meshing synchronous gears rotate in opposite directions. The drive motor provides the main driving force for the rotation of the corresponding eccentric block assembly; the synchronous gears do not transmit the main driving force. The drive motor is a bidirectional hydraulic motor, and the rotation direction is controlled by controlling the flow of hydraulic oil. By driving the corresponding eccentric block assembly to rotate through an independent drive motor, the synchronous gears only serve a synchronizing function, significantly reducing the heat generation of the vibratory box, avoiding component aging and wear caused by high temperatures, and extending the service life of the equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of pile driver equipment, specifically to a multi-motor vibration box for pile drivers. Background Technology

[0002] The vibratory box of a pile driver is the core component for driving and removing piles. It is the power source that provides high-frequency vibration, and its performance directly determines the operating efficiency and construction quality of the pile driver.

[0003] The core working components of a pile driver are two eccentric block groups. During operation, the two eccentric block groups rotate at the same speed but in opposite directions, which causes the centrifugal forces generated by the two eccentric blocks to be superimposed in the vertical direction and canceled out in the horizontal direction. This results in the vibration box generating high-frequency vibration in the vertical direction, which in turn drives the pile body to vibrate at high frequency in the vertical direction, causing the soil around the pile to liquefy. This allows the pile to be inserted into or pulled out of the soil with a smaller force.

[0004] In traditional pile driver vibratory boxes, such as Figure 1 and Figure 2 As shown, one eccentric block group 3 is the driving eccentric block group, and the other eccentric block group 3 is the driven eccentric block group. The two are connected by gear meshing. Only the driving eccentric block group is equipped with a drive motor, which drives the driving eccentric block group to rotate. The gear on the driving eccentric block group directly drives the driven eccentric block group to rotate. All the rotational driving force of the driven eccentric block group comes from the driving eccentric block group. In this structure, the gears need to bear huge forces when meshing and rotating, and a lot of heat will be generated during the transmission process. First, the heat is dissipated as a form of energy and cannot be converted into effective impact force. Second, when the heat cannot be dissipated in time, it will cause the lubricating oil inside the vibration box to age, and the bearings will have reduced clearance due to high temperature expansion, accelerating the wear rate of the bearings. In addition, the rubber parts on the outside of the vibration box that play a role in vibration damping will also age due to continuous high temperature, seriously affecting the operating efficiency of the pile driver and the service life of the equipment.

[0005] Taking a traditional vibratory box of a certain type of pile driver as an example, the oil temperature usually reaches 150 degrees Celsius after about 30 minutes of operation, which seriously affects the service life of the vibratory box and increases the failure rate. Utility Model Content

[0006] The purpose of this utility model is to provide a multi-motor vibratory box for pile drivers, which solves the technical problems of large gear transmission load and serious heat generation in traditional vibratory boxes, reduces the heat generation of the vibratory box, extends the service life of lubricating oil, bearings and vibration damping rubber parts, and improves the stability of pile driver operation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A multi-motor vibratory box for a pile driver includes a vibratory box body and at least one pair of eccentric block groups. Each eccentric block group includes a rotating shaft, an eccentric block fixed on the rotating shaft, and a synchronous gear. All synchronous gears have the same module and the same number of teeth. Each eccentric block group is rotatably mounted in the vibratory box body. Each rotating shaft is equipped with a drive motor. The main driving force for the rotation of the eccentric block group is directly provided by the drive motor connected to it. The synchronous gears meshing with each other rotate in opposite directions. The synchronous gears are used to ensure the synchronicity of the rotation of adjacent eccentric block groups, and the synchronous gears do not bear the transmission of the main driving force.

[0008] The main driving force for the rotation of the eccentric block group mentioned above is directly provided by the drive motor connected to it. This means that the rotation of the eccentric block group is not driven by the meshing of gears on other eccentric block groups, but is directly driven by the drive motor. This can be either the drive motor directly drives the eccentric block group to rotate through the rotating shaft, or the output shaft of the drive motor is connected to the input shaft of the gearbox, and the output shaft of the gearbox then drives the eccentric block group to rotate through the rotating shaft.

[0009] Furthermore, the eccentric block group consists of a pair, and the entire vibration box contains two drive motors. This structure is the simplest and easiest to implement.

[0010] Furthermore, there are four eccentric block groups, and the entire vibration box contains four drive motors. The rotation shafts of the four eccentric block groups are parallel and in the same plane, and the adjacent synchronous gears mesh with each other.

[0011] Furthermore, all the drive motors are bidirectional hydraulic motors. The bidirectional hydraulic motors are of the same model to ensure that their inherent hardware parameters are as consistent as possible, and that they rotate at the same speed under the same operating conditions. That is, the direction of rotation of the bidirectional hydraulic motor is controlled by controlling the flow of hydraulic oil, thereby driving the meshing eccentric block assembly to rotate in the opposite direction at the same speed.

[0012] Furthermore, the bidirectional hydraulic motors share the same inlet and outlet, ensuring consistent inlet and outlet pressures and consistent rotational speeds of the eccentric block assembly. This eliminates the need for additional pressure regulating structures to adjust the speed of individual motors, simplifying the overall structure, reducing control complexity, and making it easier to ensure synchronized rotation of the eccentric block assembly.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes multiple drive motors, each independently driving an eccentric block group. The rotational driving force for each eccentric block group is provided by its corresponding drive motor. The gears, which originally transmitted the rotational driving force, no longer bear the primary load; instead, they only need to ensure the synchronous rotation of the two eccentric block groups. This significantly reduces the load on the synchronous gears, completely solving the core technical problems of high load and severe heat generation associated with traditional synchronous gear meshing. It also significantly reduces the heat generation of the vibration box, extends the service life of various components, and lowers maintenance costs and construction failure rates. Furthermore, based on the law of conservation of energy, some of the energy that would otherwise be converted into heat by gears under high loads in traditional structures is instead applied as impact force in the vertical direction, further improving the product's working efficiency.

[0014] This utility model can use a bidirectional hydraulic motor of the same model from the same manufacturer as the driving component. The purpose is to obtain the same rotation speed as possible when the oil inlet and outlet have the same working conditions. The same manufacturer and model can obtain the most consistent hardware foundation. Therefore, by controlling the hydraulic oil flow direction to realize the reverse rotation of adjacent drive motors, adjacent eccentric block groups can rotate in opposite directions at the same speed, ensuring that the centrifugal force is superimposed in the vertical direction and canceled in the horizontal direction, thus ensuring the vibration effect of the vibrating box and meeting the operational requirements of pile driving and extraction.

[0015] The bidirectional hydraulic motors share the same inlet and outlet ports, ensuring consistent inlet and outlet pressures across all hydraulic motors from a mechanical perspective. Combined with the design of identical drive motors, this further ensures consistent rotational speeds of the eccentric block assembly, allowing the synchronous gear transmission structure to serve only as an auxiliary synchronization mechanism. This avoids additional loads on the synchronous gears due to differences in supply and return oil pressures, further reducing heat generation and component wear.

[0016] Taking a certain model of pile driver as an example, when the structure of this utility model is adopted, even if it works continuously for 1 hour, the oil temperature of its vibration box can be maintained at about 70 degrees Celsius, and the service life of the vibration box will be greatly improved, which shows its remarkable effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an existing pile driver vibration box; Figure 2 This is a schematic diagram of the structure of two eccentric block groups in the existing pile driver vibratory box; Figure 3 This is a schematic diagram of the structure of the two eccentric block groups in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of the assembly of the multi-motor vibration box for a pile driver according to Embodiment 1 of this utility model; Figure 5This is a schematic diagram of the structure of the synchronous gears of the four eccentric blocks meshing in pairs in Embodiment 2 of this utility model.

[0018] The following is a list of component names represented by the reference numerals in the attached diagram: 1. Vibration box body; 2. Two-way hydraulic motor; 3. Eccentric block assembly; 4. First synchronous gear; 5. Second synchronous gear; 6. Oil inlet; 7. Oil return port; 8. Third synchronous gear; 9. Fourth synchronous gear. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments.

[0020] Example 1: like Figure 3 and Figure 4 As shown, the multi-motor vibratory box for pile drivers of this utility model includes a vibratory box body 1, two drive motors, and two eccentric block groups 3. Each eccentric block group 3 includes a rotating shaft, eccentric blocks mounted on the rotating shaft, and a synchronous gear. During assembly, it must be ensured that both eccentric blocks simultaneously reach their upper and lower limit positions. For ease of description in conjunction with the accompanying drawings, the first synchronous gear 4 is defined on the first eccentric block group 3, and the second synchronous gear 5 is defined on the second eccentric block group 3. The first synchronous gear 4 and the second synchronous gear 5 mesh with each other. Both eccentric block groups 3 are rotatably mounted inside the vibratory box body 1. The two drive motors are respectively fixedly mounted on the outside of the vibratory box body 1, and the output ends of the two drive motors are coaxially fixed with the rotating shafts of the two eccentric block groups 3, respectively, realizing a direct transmission connection between the drive motors and the eccentric block groups 3. The meshing of the first synchronous gear 4 and the second synchronous gear 5 ensures the synchronicity of the rotation of the two eccentric block groups 3. This synchronous gear transmission structure only undertakes the synchronous guiding role of rotation speed, while the main driving force for the rotation of each eccentric block group 3 is directly provided by the drive motor connected to the shaft of the eccentric block group 3. That is, the synchronous gear does not bear the main driving load, but only the load caused by the small difference in rotation speed due to the difference in rotational inertia, the small difference in speed between the two drive motors, load fluctuations, etc.

[0021] Both drive motors are bidirectional hydraulic motors 2 of the same model from the same manufacturer, ensuring that the hardware parameters are as consistent as possible. The hydraulic system controls the direction of hydraulic oil inflow and outflow, so that the two bidirectional hydraulic motors 2 rotate in opposite directions, thereby driving the two eccentric block groups 3 to rotate in opposite directions at the same speed. During the rotation of the two eccentric block groups 3, the centrifugal forces in the vertical direction are superimposed, while the centrifugal forces in the horizontal direction cancel each other out.

[0022] To further ensure that the driving force and speed of the two bidirectional hydraulic motors 2 are consistent, the two bidirectional hydraulic motors 2 share the same oil inlet 6 and the same oil return port 7. Hydraulic oil is simultaneously delivered to the oil inlets of the two bidirectional hydraulic motors 2 through the same oil inlet 6, and the oil return of the two bidirectional hydraulic motors 2 is discharged through the same oil return port 7, so that the oil inlet and oil return pressures of the two bidirectional hydraulic motors 2 are completely consistent. Combined with the design of motors from the same manufacturer and of the same model, the hardware characteristics of the hydraulic motors themselves are made as similar as possible, thereby ensuring that the speed of the two eccentric block groups 3 remains highly consistent under the same external working conditions, making the synchronous auxiliary function of the synchronous gear transmission structure more stable and without generating additional load.

[0023] The working principle of this utility model is as follows: During operation, hydraulic oil enters two bidirectional hydraulic motors 2 through a common inlet 6. By controlling the flow direction of the hydraulic oil, the two bidirectional hydraulic motors 2 rotate in opposite directions. The two bidirectional hydraulic motors 2 independently drive the corresponding eccentric block groups 3 to rotate. Since the two motors are of the same model and the inlet and outlet pressures are consistent, the two eccentric block groups 3 can theoretically achieve rotation in opposite directions at the same speed. Even if the speeds are slightly out of sync at certain moments, the two eccentric block groups 3 are further meshed by synchronous gears, ensuring their synchronicity during rotation. Since the main driving force required for the rotation of the two eccentric block groups 3 is directly driven by independent drive motors, the synchronous gear transmission structure only bears the synchronous load when the speeds of the two are slightly different. That is, the synchronous gear no longer bears the load of transmitting the main driving force as in the traditional structure. Therefore, no large amount of heat is generated during the movement. The centrifugal force generated by the rotation of the two eccentric block groups 3 is superimposed in the vertical direction and canceled in the horizontal direction, causing the vibration box and pile to vibrate at high frequency, causing the soil around the pile to liquefy, thus realizing the driving or removal of the pile.

[0024] Actual testing showed that after one hour of continuous operation, the temperature of the vibration chamber of the pile driver using this solution remained at around 70 degrees Celsius and did not continue to rise.

[0025] Example 2: In this example, four eccentric block groups 3 are used, each of which is driven by a bidirectional hydraulic motor 2. The four bidirectional hydraulic motors 2 share an oil inlet 6 and an oil return port 7, and the meshing synchronous gears rotate in opposite directions.

[0026] like Figure 5As shown, the four eccentric block groups 3 have parallel rotating shafts and are in the same plane, that is, the four eccentric block groups 3 are arranged in a line. The adjacent synchronous gears mesh with each other. Specifically, the first synchronous gear 4 meshes with the second synchronous gear 5, the second synchronous gear 5 meshes with the third synchronous gear 8, and the third synchronous gear 8 meshes with the fourth synchronous gear 9. Through the meshing of the above synchronous gears, the synchronicity of the four eccentric block groups 3 during rotation is ensured. Moreover, the synchronous gear transmission structure only undertakes the synchronous guiding function and does not undertake the transmission of the main driving force for driving the eccentric block groups 3 to rotate. Therefore, the heat generation during operation is low.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-motor vibratory box for a pile driver, characterized in that, The device includes a vibration box body and at least one pair of eccentric block groups. Each eccentric block group includes a rotating shaft, an eccentric block fixed on the rotating shaft, and a synchronous gear. Each rotating shaft is equipped with a drive motor. The main driving force for the rotation of the eccentric block group is directly provided by the drive motor connected to it. The synchronous gear is used to ensure the synchronicity of the rotation of adjacent eccentric block groups, and the synchronous gear does not bear the transmission of the main driving force. The synchronous gears that mesh with each other rotate in opposite directions.

2. The multi-motor vibratory box for a pile driver according to claim 1, characterized in that, The eccentric block group is a pair.

3. The multi-motor vibratory box for a pile driver according to claim 1, characterized in that, There are four eccentric block groups, and the rotating shafts of the four eccentric block groups are parallel and in the same plane, with adjacent synchronous gears meshing with each other.

4. The multi-motor vibratory box for a pile driver according to any one of claims 1-3, characterized in that, All drive motors are bidirectional hydraulic motors.

5. The multi-motor vibratory box for a pile driver according to claim 4, characterized in that, The bidirectional hydraulic motors share the same oil inlet and the same oil return port.

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