Variable-frequency vibroflot with adjustable exciting force

Abstract

The utility model relates to a variable-frequency vibroflot with adjustable exciting force, and belongs to the field of vibroflots. The vibroflot comprises a vibroflot shell and an eccentric shaft, the eccentric shaft comprises a center shaft, a balance weight structure movable cavity is formed in the vibroflot shell, an eccentric shell is fixedly installed outside the center shaft, the eccentric shaft further comprises a fixed balance weight located in the eccentric shell, a first cavity and a second cavity are formed in the eccentric shell, and an air bag is arranged in the second cavity; and a movable counter weight for applying extrusion to the air bag is arranged in the second cavity. According to the variable-frequency vibroflot with the adjustable excitation force, the maximum excitation force and the no-load amplitude can be controlled by arranging the air bag and the movable balance weight and adjusting the oil injection pressure or the oil injection amount, the maximum excitation force is continuously adjustable, the vibroflot effects of low amplitude, high vibration frequency, high amplitude, low vibration frequency and the like can be achieved, and the variable-frequency vibroflot with the adjustable excitation force has multiple purposes; and the application range of the variable-frequency vibroflot is widened.

Description

Technical Field

[0001] This utility model relates to the field of vibratory beaters, specifically a variable frequency vibratory beater with adjustable excitation force. Background Technology

[0002] The principle of a vibratory compactor is that the rotation of an eccentric rotor generates excitation force, which drives the vibrator housing to vibrate in a circular motion. The vibration is transmitted to the soil around the vibratory compactor, causing compaction, liquefaction, and other effects. Conventional vibratory compactors typically have a fixed eccentricity of the eccentric shaft, therefore the maximum excitation force and no-load amplitude at a given rotational speed are also fixed.

[0003] Vibro-compaction construction involves two stages: hole formation and compaction. In the hole formation stage, it's generally desirable for the vibro-compactor to have good penetration capabilities for rapid pile formation. In the compaction stage, it's desirable for the vibro-compactor to have a greater impact on the surrounding soil. Based on existing construction experience, vibro-compactors with small amplitude and high rotation speed have better penetration capabilities, while those with relatively large amplitude and low rotation speed often have better compaction effects.

[0004] Currently, there is no mature technology for variable excitation force applied to vibratory compactors. In actual construction, it is usually necessary to use different types of vibratory compactors in combination, which results in limited construction efficiency and high construction costs.

[0005] Based on this, the present utility model is proposed. Utility Model Content

[0006] This utility model addresses the shortcomings of existing technologies by providing a variable frequency vibratory impulser with adjustable excitation force, the technical solution of which is as follows:

[0007] An adjustable-force variable-frequency vibratory compactor includes a compactor housing and an eccentric shaft. The eccentric shaft includes a central shaft. The compactor housing has a movable cavity for a counterweight structure. The eccentric shaft is rotatably connected to the compactor housing. An eccentric shell is fixedly installed outside the central shaft and is located within the movable cavity for the counterweight structure. The eccentric shaft also includes a fixed counterweight located within the eccentric shell. The eccentric shell has a first cavity for accommodating the fixed counterweight and a second cavity opposite to the first cavity. An air bladder is disposed within the second cavity. The second cavity and the movable cavity for the counterweight structure are connected by an oil inlet channel. A movable counterweight for applying pressure to the air bladder is disposed within the second cavity. The movable counterweight is fixedly connected to the air bladder. The air bladder is fixedly connected to the side wall of the second cavity. The connection between the air bladder and the second cavity is opposite to the movable counterweight. The movable counterweight is located on the side of the second cavity away from the fixed counterweight.

[0008] As a further embodiment of this utility model, multiple second cavities, airbags, and movable counterweights are provided, with each second cavity containing an airbag and a movable counterweight.

[0009] As a further embodiment of this utility model, the second cavity, the airbag, and the movable counterweight are each provided in three parts; the three second cavities are respectively marked as the first second cavity, the second second cavity, and the third second cavity along the circumferential direction of the eccentric shell, and the first second cavity and the third second cavity are arranged axially symmetrically.

[0010] As a further embodiment of this utility model, the volume of the first second cavity is equal to the volume of the third second cavity, and the ratio of the volume of the second second cavity to the volume of the first second cavity is x, where 1.1 ≤ x ≤ 2.

[0011] As a further embodiment of this utility model, x = 1.33.

[0012] As a further embodiment of this invention, an air inlet is provided on the top of the eccentric shell.

[0013] As a further embodiment of this invention, an oil injection hole is provided at the top of the vibratory impactor housing.

[0014] As a further embodiment of this invention, an adhesive layer is provided at the connection between the airbag and the second cavity, as well as at the connection between the movable counterweight and the airbag.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The variable frequency vibratory beater with adjustable excitation force described in this utility model can control the maximum excitation force and no-load amplitude by setting an air bag and / or a movable counterweight, and by adjusting the oil injection pressure or oil injection amount. The magnitude of the maximum excitation force is continuously adjustable.

[0017] 2. The change in the mass-radius product of the eccentric shaft is independent of whether the eccentric shaft rotates, the direction of rotation, and the rotational speed; it can be adjusted at any time, making it highly controllable.

[0018] 3. The vibratory impactor has a simple structure and requires minimal modification to the eccentric shaft.

[0019] 4. The adjustable excitation force variable frequency vibrator can achieve vibration effects such as low amplitude and high frequency, and high amplitude and low frequency, making it a multi-purpose device and expanding the application range of the variable frequency vibrator. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the adjustable excitation force variable frequency vibratory actuator;

[0021] Figure 2 This is a schematic diagram of the internal structure of the adjustable excitation force variable frequency vibratory actuator. Detailed Implementation

[0022] The present invention will be described in detail below with reference to specific embodiments. These embodiments are merely some, not all, implementations of the present invention. All other implementations obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] Example 1

[0024] like Figure 1 , 2 As shown, a variable frequency vibratory impactor with adjustable excitation force includes an impactor housing 10 and an eccentric shaft. The eccentric shaft includes a central shaft 31. The internal cavity of the impactor housing 10 is provided with a counterweight structure movable cavity 11. The eccentric shaft is rotatably connected to the impactor housing 10. An eccentric shell 34 is fixedly installed outside the central shaft 31. The eccentric shell 34 is located inside the counterweight structure movable cavity 11. The eccentric shaft also includes a fixed counterweight 33 located inside the eccentric shell 34. The eccentric shell 34 is provided with a first cavity for accommodating the fixed counterweight 33 and a second cavity 343 arranged opposite to the first cavity. An airbag 32 is provided in the second cavity 343. The second cavity 343 is connected to the counterweight structure movable cavity 11 through an oil inlet channel 341.

[0025] This invention relates to a vibratory impactor that utilizes gas-liquid pressure balance to change the volume of an eccentric block, thereby altering the excitation force and amplitude. The eccentric shaft is an integral structure, with bearings supporting both ends of the central shaft 31, allowing it to be rotatably connected to the vibratory impactor housing 10. In this embodiment, the first cavity and the second cavity 343 are arranged axially symmetrically, and the number of the first cavity is equal to the number of the second cavity 343. The fixed counterweight 33 can be made of lead. The airbag 32 is filled with gas at a certain pressure (e.g., 1 kgf / cm³). 2 After the airbag 32 is filled with gas, its shape fills the entire second cavity 343. The oil inlet 341 is located at the bottom of the eccentric shell 34. The internal space of the counterweight structure movable cavity 11 and the second cavity 343 is filled with lubricating oil.

[0026] During the pile driving process, lubricating oil is injected into the vibratory compactor housing 10 to make the oil pressure exceed the original pressure inside the air bladder 32 (e.g., 1 kgf / cm²). 2 The air bladder 32 is compressed, and the second cavity 343 inside the eccentric shaft is filled with lubricating oil. When most of the area of ​​the second cavity 343 is filled with lubricating oil, the pressure inside the air bladder 32 will rise to several times the original pressure (e.g., 10 times, reaching 1 MPa). At this point, the oil pressure is equal to the pressure inside the air bladder 32, and this oil injection pressure is maintained thereafter. The mass of the lubricating oil filling the second cavity 343 offsets part of the mass of the other half of the eccentric shaft (part of the mass of the fixed counterweight 33), reducing the eccentric mass-radius product of the eccentric shaft. Therefore, the excitation force and amplitude generated during rotation are smaller.

[0027] Conversely, during the compaction process, the oil injection pressure is changed to a level lower than the original pressure inside the air bladder 32. The gas inside the air bladder expands, expelling the lubricating oil from the second chamber 343. At this point, the eccentric mass-radius product of the eccentric shaft increases. Therefore, the excitation force and amplitude generated during rotation are larger.

[0028] The advantages of this embodiment are:

[0029] The maximum excitation force and no-load amplitude can be controlled by adjusting the oil injection pressure, and the magnitude of the maximum excitation force is continuously adjustable.

[0030] The change in the mass-radius product of the eccentric shaft is independent of whether the eccentric shaft rotates, the direction of rotation, and the rotational speed; it can be adjusted at any time, making it highly controllable.

[0031] It has a simple structure and requires minimal modification to the eccentric shaft.

[0032] Example 2

[0033] In this example, the movable counterweight 35 is located on the side away from the fixed counterweight 33 within the second cavity 343.

[0034] Before the eccentric shaft rotates, lubricating oil at a certain pressure is injected into the movable cavity 11 of the counterweight structure. By increasing the oil pressure, the gas inside the air bladder is compressed, causing the air bladder to contract and move the movable counterweight 35 towards the center of rotation. When the eccentric shaft rotates, the centrifugal force generated by the movable counterweight 35 tends to move outward (away from the center of rotation). However, since the lubricating oil is incompressible, the movable counterweight 35 remains in its original position.

[0035] Compared to the scheme in Example 1, the movable counterweight 35 in this embodiment provides a more significant adjustment to the eccentric force. Furthermore, the maximum excitation force of the vibratory compactor is not affected by centrifugal force, but depends only on the oil injection pressure. At different speeds, the maximum excitation force adjustment is less affected by interference, resulting in higher system stability. Therefore, the vibratory compactor of this embodiment is particularly suitable for variable frequency vibratory compactors, and can also be used for fixed frequency vibratory compactors.

[0036] Multiple second chambers 343, airbags 32, and movable counterweights 35 are provided, with each second chamber 343 containing an airbag 32 and a movable counterweight 35. For example, three second chambers 343, airbags 32, and movable counterweights 35 are provided; the three second chambers 343 are labeled as the first, second, and third second chambers along the circumference of the eccentric shell 34, respectively, with the first and third second chambers arranged axially symmetrically. The volume of the first and third second chambers is equal, and the ratio of the volume of the second second chamber to the volume of the first second chamber is x, where 1.1 ≤ x ≤ 2. If only a single large-volume movable counterweight 35 is used, its and the airbags 32 have limited force-bearing areas, resulting in limited response rates in the application of the frequency converter. The design employs multiple independent second chambers 343, each containing an airbag 32 and a movable counterweight 35. This maximizes the force-bearing area. When the oil injection pressure in the movable chamber 11 of the counterweight structure changes dynamically, and the eccentric shaft speed is adjusted by the frequency converter, the response rate of the frequency converter vibratory impactor can be maximized. This further enhances the fast response and high flexibility of the frequency converter vibratory impactor, thereby meeting the requirements of different material properties and construction requirements.

[0037] From the perspective of stability and security, x must be greater than 1. If x is too large, stability and security will become very poor. If x is too small, the response will deteriorate. Therefore, preferably, x is 1.33.

[0038] Example 3

[0039] To facilitate inflation, an inflation port 342 is provided on the top of the eccentric shell 34, and an inflation valve is installed at the inflation port 342.

[0040] After assembling the airbag 32, inflate it by connecting an external air source to the inflation valve and opening the valve. Once inflation is complete, close the inflation valve. Disconnect the air hose and interface between the inflation valve and the air source.

[0041] Example 4

[0042] To facilitate the injection of oil into the movable cavity 11 of the counterweight structure, an oil injection hole 12 is provided on the top of the vibratory impactor housing 10.

[0043] Hydraulic equipment can be connected to the oil injection port 12 to facilitate the adjustment of the oil injection pressure.

[0044] In some embodiments, a hydraulic lock (one-way valve) may be installed at the oil injection port 12. After oil injection is stopped, the hydraulic lock engages, trapping the lubricating oil within the counterweight structure's movable cavity 11.

[0045] Example 5

[0046] The airbag 32 can be installed using adhesive bonding. Adhesive layers are provided at the connection points between the airbag 32 and the second cavity 343, as well as at the connection points between the movable counterweight 35 and the airbag 32. The adhesive layers are formed after the adhesive has cured.

[0047] Furthermore, it should be understood that those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A variable frequency vibratory shock absorber with adjustable excitation force, comprising a shock absorber housing (10) and an eccentric shaft, the eccentric shaft including a central shaft (31), the shock absorber housing (10) having an internal counterweight structure movable cavity (11), the eccentric shaft being rotatably connected to the shock absorber housing (10), characterized in that: An eccentric shell (34) is fixedly installed outside the central shaft (31), and the eccentric shell (34) is located inside the movable cavity (11) of the counterweight structure. The eccentric shaft also includes a fixed counterweight (33) located inside the eccentric shell (34). The eccentric shell (34) is provided with a first cavity for accommodating the fixed counterweight (33) and a second cavity (343) arranged opposite to the first cavity. An airbag (32) is provided inside the second cavity (343). The second cavity (343) and the movable cavity (11) of the counterweight structure are connected by a... An oil inlet channel (341) is provided; a movable counterweight (35) for applying pressure to the airbag (32) is provided inside the second cavity (343). The movable counterweight (35) is fixedly connected to the airbag (32). The airbag (32) is fixedly connected to the side wall of the second cavity (343). The connection between the airbag (32) and the second cavity (343) is opposite to the movable counterweight (35). The movable counterweight (35) is located in the second cavity (343) on the side away from the fixed counterweight (33).

2. The variable frequency vibratory oscillator with adjustable excitation force according to claim 1, characterized in that: The second chamber (343), the airbag (32) and the movable counterweight (35) are provided in multiple ways, and each second chamber (343) is provided with an airbag (32) and a movable counterweight (35).

3. The variable frequency vibratory oscillator with adjustable excitation force according to claim 2, characterized in that: The second cavity (343), the airbag (32) and the movable counterweight (35) are each provided with three; the three second cavities (343) are marked as the first second cavity, the second second cavity and the third second cavity respectively along the circumferential direction of the eccentric shell (34), and the first second cavity and the third second cavity are arranged axially symmetrically.

4. The variable frequency vibratory impulser with adjustable excitation force according to claim 3, characterized in that: The volume of the first second cavity is equal to the volume of the third second cavity, and the ratio of the volume of the second second cavity to the volume of the first second cavity is x, where 1.1 ≤ x ≤ 2.

5. The variable frequency vibratory pulser with adjustable excitation force according to claim 4, characterized in that: x＝1.33。 6. The variable frequency vibratory impulser with adjustable excitation force according to claim 1, characterized in that: The top of the eccentric shell (34) is provided with an air inlet (342).

7. The variable frequency vibratory impulser with adjustable excitation force according to claim 1, characterized in that: The top of the vibratory impactor housing (10) is provided with an oil injection hole (12).

8. The variable frequency vibratory oscillator with adjustable excitation force according to claim 1, characterized in that: An adhesive layer is provided at the connection between the airbag (32) and the second cavity (343) and at the connection between the movable counterweight (35) and the airbag (32).

Images