Buffer structure for an oversized hydraulic hammer

Abstract

Buffer structure for an oversized hydraulic hammer, comprising a pile cap, a striking adapter, and a hydraulic hammer; wherein the pile cap comprises a sleeve mounted on the apex of the pile foundation, a head ring plate connected to the apex of the sleeve, and a round-plate-shaped head plate connected to the inner end of the head ring plate; wherein a stop ring is attached centrally to the inner wall of the sleeve of the pile cap; wherein the striking adapter is mounted inside the pile cap and comprises a striking adapter ring and a striking adapter body; wherein the axial cross-sectional profile of the striking adapter ring is L-shaped and comprises a lower ring section and an upper cylinder section connected to the head surface of the lower ring section; wherein the striking adapter ring is mounted on the stop ring in the sleeve of the pile cap;wherein the impact adapter body is a round, plate-shaped body adapted to the upper interior of the pile cap, wherein the impact adapter body is mounted between the head plate of the pile cap and the lower ring section of the impact adapter ring; characterized in that the buffer structure further comprises several buffer cylinders, recoil pads and several buffer rings; ; wherein the center of the head plate of the pile cap extends coaxially upwards and forms a damping cylinder with a head flange; wherein several buffer cylinders are each mounted correspondingly in several through bores evenly distributed around the circumference of the head ring plate of the pile cap, wherein the lower end face of the piston rods of several buffer cylinders rests against the head face of the impact adapter ring of the impact adapter; wherein the recoil pad is mounted at the lower end of the damping cylinder of the pile cap, wherein the lower end face of the recoil pad rests against the defined head face of the impact adapter body; wherein several buffer rings are arranged one above the other in the damping cylinder of the pile cap and are located between the backstop pad and the head flange of the damping cylinder; wherein the hydraulic hammer comprises a hammer housing and a hammer core; wherein the hammer housing is connected to the head flange of the pile cap damping cylinder by means of a bottom flange; wherein the hammer core is arranged inside the hammer housing and is inserted into several buffer rings and recoil pads of the pile cap damping cylinder, wherein the lower end face of the hammer core rests on the head face of the impact adapter body.

Description

Technical field

[0001] The utility model relates to a buffer structure for an oversized hydraulic hammer. Background technology

[0002] Currently, the diameter of individual pile foundations for offshore wind turbines is trending upwards, which in turn is steadily increasing the energy demand of the pile drivers. When using oversized hydraulic hammers in the driving process, the impact of the driving stroke and the elastic rebound on the pile tip generate significant rebound energy that must be addressed to prevent damage to the pile driver. The currently common solution involves using several rubber rings with a metal frame as buffers; however, their damping effect is insufficient, heat dissipation is poor, and the rebound energy cannot be completely absorbed. The use of damping cylinders, which offer better damping performance, is associated with problems such as high susceptibility to damage and excessive costs. Content of the utility model

[0003] The purpose of this utility model is to provide a buffer structure for an oversized hydraulic hammer that is capable of maximally absorbing the energy generated by impact impulses and rebound forces.

[0004] The purpose of this utility model is achieved as follows: Buffer structure for an oversized hydraulic hammer, comprising a pile cap, a striking adapter, and a hydraulic hammer; wherein the pile cap comprises a sleeve mounted on the top of the pile foundation, a head ring plate connected to the top of the sleeve, and a round-plate-shaped head plate connected to the inner end of the head ring plate; wherein a stop ring is attached centrally to the inner wall of the sleeve of the pile cap; wherein the striking adapter is mounted inside the pile cap and comprises a striking adapter ring and a striking adapter body; wherein the axial cross-sectional profile of the striking adapter ring is L-shaped and comprises a lower ring section and an upper cylinder section connected to the head surface of the lower ring section; wherein the striking adapter ring is mounted on the stop ring in the sleeve of the pile cap;wherein the impact adapter body is a round, plate-shaped body adapted to the upper interior of the pile cap, wherein the impact adapter body is mounted between the head plate of the pile cap and the lower ring section of the impact adapter ring; characterized in that the buffer structure further comprises several buffer cylinders, recoil pads and several buffer rings; wherein the center of the head plate of the pile cap extends coaxially upwards and forms a damping cylinder with a head flange; wherein several buffer cylinders are each mounted correspondingly in several through bores evenly distributed around the circumference of the head ring plate of the pile cap, wherein the lower end face of the piston rods of several buffer cylinders rests against the head face of the impact adapter ring of the impact adapter; wherein the recoil pad is mounted at the lower end of the damping cylinder of the pile cap, wherein the lower end face of the recoil pad rests against the defined head face of the impact adapter body; wherein several buffer rings are arranged one above the other in the damping cylinder of the pile cap and are located between the backstop pad and the head flange of the damping cylinder; wherein the hydraulic hammer comprises a hammer housing and a hammer core; wherein the hammer housing is connected to the head flange of the pile cap damping cylinder by means of a bottom flange; wherein the hammer core is arranged inside the hammer housing and is inserted into several buffer rings and recoil pads of the pile cap damping cylinder, wherein the lower end face of the hammer core rests on the head face of the impact adapter body.

[0005] In the aforementioned buffer structure for an oversized hydraulic hammer, the material of the recoil pad is metal.

[0006] In the buffer structure described above for an oversized hydraulic hammer, several radial grooves are arranged on the head and bottom surfaces of the buffer ring.

[0007] In the above buffer structure for an oversized hydraulic hammer, the buffer ring is a rubber ring with a metal frame.

[0008] The utility model relates to a buffer structure for an oversized hydraulic hammer and has the following features: 1. Multiple buffer cylinders are used as the primary buffer structure and multiple buffer rings as the secondary buffer structure, effectively reducing rebound energy during subsequent pile driving. Simultaneously, the heat generated during pile driving can be dissipated through the spaces between the surfaces of the buffer rings. This enables effective damping of the rebound after the impact of the heavy hammer, thereby maximizing the absorption of energy generated by the impact impulse and rebound forces. This significantly improves the stability and service life of the entire hydraulic hammer. 2. Compared to the exclusive use of a buffer ring, the present utility model has a better damping effect; compared to the exclusive use of a buffer cylinder, it is more economical and results in a lower risk of damage to the buffer cylinder. Illustration of the attached drawings Fig. Figure 1 shows a perspective view of the pile cap in the buffer structure for an oversized hydraulic hammer in the present utility model; Fig. Figure 2 shows a main view of the buffer structure for an oversized hydraulic hammer in the present utility model; Fig. Figure 3 shows the view along line AA in Fig. 2; Fig. Figure 4 shows a plan view of the buffer ring of the buffer structure for an oversized hydraulic hammer in the present utility model. Specific embodiments

[0009] The present utility model is described in more detail below with reference to the illustrations in the attached drawings.

[0010] With reference to Fig. 1 to Fig.4 A buffer structure for an oversized hydraulic hammer is disclosed in the present utility model, consisting of a pile cap 1, a striking adapter 2, several buffer cylinders 3, recoil pads 4, several buffer rings 5 ​​and a hydraulic hammer 6.

[0011] The pile cap 1 comprises a sleeve 11 placed at the top of the pile foundation, a head ring plate 12 connected to the top of the sleeve 11, and a round-shaped head plate 13 connected to the inner end of the head ring plate 12; wherein a stop ring 110 is attached centrally to the inner wall of the sleeve 11; wherein a damping cylinder 14 with a head flange extends coaxially upwards from the center of the head plate 13; wherein several through holes are arranged axially and evenly distributed around the circumference of the head ring plate 12.

[0012] The impact adapter 2 is mounted inside the pile cap 1 and comprises an impact adapter ring 21 and an impact adapter body 22; wherein the axial cross-sectional profile of the impact adapter ring 21 is L-shaped and comprises a lower ring section and an upper cylinder section connected to the head surface of the lower ring section; wherein the outer diameter of the impact adapter ring 21 is matched to the inner diameter of the sleeve 11 of the pile cap 1, wherein the impact adapter ring 21 is mounted on the stop ring 110 inside the sleeve 11 of the pile cap 1; wherein the impact adapter body 22 is a round plate-shaped body adapted to the upper inner cavity of the pile cap 1, wherein the bottom diameter of the impact adapter body 22 is matched to the inner diameter of the upper cylinder section of the impact adapter ring 21 and is smaller than the inner diameter of the head ring plate 12 of the pile cap 1;wherein the impact adapter body 22 is mounted between the head plate 12 of the pile cap 1 and the lower ring section of the impact adapter ring 21.

[0013] Several buffer cylinders 3 are each mounted correspondingly in several through bores of the head ring plate 12 of the pile cap 1, evenly distributed around the circumference, with the lower end face of the piston rods of several buffer cylinders 3 resting on the head face of the vertical section of the impact adapter ring 21;

[0014] The recoil pad 4 is mounted at the lower end of the damping cylinder 14 of the pile cap 1, wherein the lower end face of the recoil pad 4 rests against the fixed head face of the impact adapter body 22; wherein the material of the recoil pad 4 is metal, wherein the axial cross-section of the recoil pad 4 has an inverted L-shape.

[0015] Several buffer rings 5 ​​are arranged one above the other in the damping cylinder 14 of the pile cap 1 and are located between the backstop 4 and the head flange of the damping cylinder 14. The buffer ring 5 is a rubber ring with a metal framework; several radial grooves 50 are arranged on the head and bottom surfaces of each buffer ring 5, which serve for heat dissipation and ventilation.

[0016] The hydraulic hammer 6 comprises a hammer housing 61 and a hammer core 62; wherein the hammer housing 61 is connected to the head flange of the damping cylinder 14 of the pile cap 1 by means of a bottom flange; wherein the hammer core 62 is arranged inside the hammer housing 61 and is inserted in several buffer rings 5 ​​and recoil pads 4 of the damping cylinder 14 of the pile cap 1, wherein the lower end face of the hammer core 62 rests on the head face of the impact adapter body 22.

[0017] The buffer structure for an oversized hydraulic hammer in the present utility model uses a secondary buffer structure, with several buffer cylinders 3 serving as the primary buffer level; several superimposed buffer rings 5 ​​acting as the secondary buffer structure and also performing the main buffer function. During operation, the rebound force of the impact adapter 2 is first transmitted via the impact adapter ring 21 to the several buffer cylinders 3 of the first buffer structure, thereby compressing the piston rods of the buffer cylinders 3 and absorbing some of the energy. Subsequently, the rebound force of the impact adapter 2 is transmitted via the impact adapter body 22 to the recoil pad 4, which in turn transmits the force of the recoil pad 4 to the several buffer rings 5 ​​of the secondary buffer structure.Due to the high equivalent modulus of elasticity of the rubber buffer rings 5, the buffer compression is low, which significantly reduces the rebound energy of the impact adapter and prevents a strong rebound load on the hammer housing 61, thus extending the service life of the equipment. The secondary buffer structure also limits the compression of the buffer cylinder 3 and indirectly protects it. The buffer cylinder 3 can be directly removed and replaced from the outside at the pile cap 1.

[0018] The above-mentioned embodiments serve only to illustrate the present utility model and do not constitute a limitation thereof. Those skilled in the relevant technical field may make various modifications or adaptations without deviating from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions should also fall within the scope of protection of this utility model and be defined by the respective claims.

Claims

[1] Buffer structure for an oversized hydraulic hammer, comprising a pile cap, a striking adapter and a hydraulic hammer; wherein the pile cap comprises a sleeve mounted on the tip of the pile foundation, a head ring plate connected to the tip of the sleeve and a round-plate-shaped head plate connected to the inner end of the head ring plate; wherein a stop ring is attached centrally to the inner wall of the sleeve of the pile cap; wherein the striking adapter is mounted inside the pile cap and comprises a striking adapter ring and a striking adapter body; wherein the axial cross-sectional profile of the striking adapter ring is L-shaped and comprises a lower ring section and an upper cylinder section connected to the head surface of the lower ring section; wherein the striking adapter ring is mounted on the stop ring in the sleeve of the pile cap;wherein the impact adapter body is a round, plate-shaped body adapted to the upper interior of the pile cap, wherein the impact adapter body is mounted between the head plate of the pile cap and the lower ring section of the impact adapter ring; ; characterized by that the buffer structure continues to include multiple buffer cylinders, backstop pads and multiple buffer rings; wherein the center of the head plate of the pile cap extends coaxially upwards and forms a damping cylinder with a head flange; wherein several buffer cylinders are each mounted correspondingly in several through bores evenly distributed around the circumference of the head ring plate of the pile cap, wherein the lower end face of the piston rods of several buffer cylinders rests against the head face of the impact adapter ring of the impact adapter; wherein the recoil pad is mounted at the lower end of the damping cylinder of the pile cap, wherein the lower end face of the recoil pad rests against the defined head face of the impact adapter body; wherein several buffer rings are arranged one above the other in the damping cylinder of the pile cap and are located between the backstop pad and the head flange of the damping cylinder; wherein the hydraulic hammer comprises a hammer housing and a hammer core; wherein the hammer housing is connected to the head flange of the pile cap damping cylinder by means of a bottom flange; wherein the hammer core is arranged inside the hammer housing and is inserted into several buffer rings and recoil pads of the pile cap damping cylinder, wherein the lower end face of the hammer core rests on the head face of the impact adapter body. [2] Buffer structure for an oversized hydraulic hammer according to claim 1, characterized bythat the material of the recoil pad is metal. [3] Buffer structure for an oversized hydraulic hammer according to claim 1, characterized by that several radial grooves are arranged on the head and bottom surfaces of the buffer ring. [4] Buffer structure for an oversized hydraulic hammer according to claim 1 or 3, characterized by that the buffer ring is a rubber ring with a metal frame.

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