Hydraulic assembly of hydraulic pile hammer

Abstract

The utility model relates to the technical field of engineering machinery, in particular to a hydraulic assembly of a hydraulic pile hammer, which comprises an outer cylinder barrel, an inner cylinder barrel, a piston assembly and a valve block, the valve block is sleeved at the top of the outer cylinder barrel through a flange, the inner cylinder barrel is positioned in an inner cavity of the outer cylinder barrel, the top of the inner cylinder barrel is positioned in the valve block, and a hollow hydraulic cavity is arranged in the inner cylinder barrel. The piston assembly is arranged in an inner cavity of the inner cylinder barrel in a sliding mode and comprises a piston rod and a piston arranged on the piston rod in a penetrating mode, a wear-resisting ring is arranged on the piston, a protection structure is arranged on the upper end face of the piston, and the protection structure can promote the wear-resisting ring to be located in the hydraulic cavity all the time. The utility model has the beneficial effects that after the joint of the piston rod and the hammer core is broken, the structure is protected, and the maintenance difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a hydraulic component of a hydraulic pile hammer. Background Art

[0002] A hydraulic pile hammer is an impact piling machine, which mainly strikes the pile body by free fall, and obtains acceleration energy from the hydraulic system to increase the impact speed to strike the pile body after being lifted to the expected height by the hydraulic system. The hydraulic pile hammer mainly includes a valve and a hydraulic cylinder. The publication number is "CN211573913U", a hydraulic hammer lifting cylinder and a valve block combination, including an outer cylinder, an inner cylinder, a piston rod, a lower end cover, an annular oil channel, a valve block, an upper earring, a second reversing cartridge valve, a third reversing cartridge valve and a one-way cartridge valve; the valve block is located between the outer cylinder and the upper earring; the inner The cylinder barrel and the outer cylinder barrel are placed in the central pit and the cylindrical boss of the valve block and then fastened; there are multiple oil holes at the bottom of the inner cylinder barrel, which connect the lower hydraulic chamber with the annular oil channel; the upper hydraulic chamber and the lower hydraulic chamber are connected after being opened by the one-way cartridge valve; the second reversing cartridge valve, the third reversing cartridge valve and the one-way cartridge valve are respectively installed on the valve block at the installation positions between the first and third internal oil channels, the fourth and sixth internal oil channels, and the second and fifth internal oil channels, so as to achieve the characteristics of large striking energy, small fluctuation of hydraulic oil reversing pressure, small vibration of hydraulic pipeline, high efficiency and stability of hydraulic system, high utilization rate of high-pressure oil and high piling efficiency;

[0003] However, after long-term use, the piston rod and the connecting end of the hammer core of the above-mentioned documents and most pile hammers on the market will break. At the same time, since the outside of the piston is often provided with a wear-resistant ring, when the piston rod breaks, the piston will rush into the valve block, in addition to causing mechanical collision to the hole, the wear-resistant ring on the piston will fall off and enter the oil channel of the valve block, causing valve parts to get stuck and other faults, causing great inconvenience to subsequent maintenance;

[0004] In addition, the piston rod of most existing pile hammers is connected to the hammer core by a step positioning method at the connecting end, which may cause stress concentration at the step, especially under high-frequency impact working conditions, which may cause fatigue cracks, reduce the life of the pile hammer, and thus cause the piston rod to break. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a hydraulic assembly of a hydraulic pile hammer which has a protective structure when the connection between the piston rod and the hammer core is broken and can improve the strength of the piston rod in view of the above-mentioned deficiencies in the prior art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hydraulic component of a hydraulic pile hammer, comprising an outer cylinder, an inner cylinder, a piston assembly and a valve block, the valve block being mounted on the top of the outer cylinder through a flange sleeve, the inner cylinder being located in the inner cavity of the outer cylinder, and its top being located in the valve block, a hollow hydraulic cavity being provided in the inner cylinder, an oil inlet passage being communicated with the hydraulic cavity being provided between the valve block and the inner cylinder, the piston assembly being slidably arranged in the inner cavity of the inner cylinder, the piston assembly comprising a piston rod and a piston passing through the piston rod, the piston being provided with a wear-resistant ring, and characterized in that a protective structure is provided on the upper end surface of the piston, and the protective structure can cause the wear-resistant ring to always be located in the hydraulic cavity.

[0007] Adopting the above technical scheme: Compared with the piston assembly in the existing pile hammer, the utility model arranges a protective structure on the piston. When the connection end between the piston rod and the hammer core is broken, the protective structure can make the wear-resistant ring always located in the hydraulic cavity and will not enter the interior of the valve block. Therefore, if the wear-resistant ring falls off, it will not fall into the oil channel of the valve block and cause valve jamming and other faults. At the same time, the setting of the protective structure also avoids mechanical collision of the piston with the channel.

[0008] A further configuration of the utility model is that the protection structure comprises a limiting boss connected to the upper end surface of the piston, and the limiting boss is sleeved on the piston rod through a through hole provided in the middle.

[0009] The above technical solution is adopted: through the setting of the limiting boss, when the connecting end of the piston rod and the hammer core is broken, the limiting boss plays a limiting role on the wear-resistant ring, so that the wear-resistant ring is always located in the hydraulic cavity and will not enter the valve block, thereby preventing the wear-resistant ring from falling off into the oil channel of the valve block, causing subsequent maintenance troubles and other problems.

[0010] A further configuration of the utility model is that the diameter of the oil inlet passage is smaller than the height of the limiting boss, and the diameter of the limiting boss is smaller than the diameter of the piston.

[0011] By adopting the above technical solution: the diameter of the oil inlet channel is smaller than the height of the limiting boss, so as to prevent the wear-resistant ring from entering the valve block and always being located in the hydraulic cavity. At the same time, the diameter of the limiting boss is smaller than the diameter of the piston, so that the limiting boss will not hinder the oil from entering the hydraulic cavity.

[0012] A further configuration of the utility model is that an annular oil passage is provided between the outer cylinder and the inner cylinder, and a plurality of oil holes are opened along the circumferential direction at the bottom of the inner cylinder, and the oil holes can conduct the hydraulic cavity with the annular oil passage.

[0013] The above technical solution is adopted: through the setting of the annular oil channel and the oil hole, the hydraulic oil flows inside the pile hammer, thereby generating pressure on the piston assembly in the inner cylinder, thereby driving the impact part of the pile hammer to move up and down. In addition, the flow of hydraulic oil in the annular oil channel also helps to dissipate heat. The hydraulic oil can take away the heat generated by friction and impact, thereby protecting the various components of the pile hammer from damage due to overheating.

[0014] A further configuration of the utility model is that a first mounting portion is provided at the lower end of the piston rod, the diameter of the first mounting portion is smaller than the diameter of the piston rod, and a first annular inclined surface is formed between the first mounting portion and the piston rod.

[0015] Adopting the above-mentioned technical scheme: Compared with the step positioning method adopted at the connection between the piston rod and the hammer core in the prior art, the utility model increases the positioning area when the piston rod and the hammer core are assembled through the arrangement of the first mounting portion and the first annular inclined surface. At the same time, during use, the stress is no longer concentrated in a sharp corner, but is dispersed to a larger area. This can effectively reduce the local stress level, reduce the possibility of stress concentration, greatly improve the strength of the piston rod, and improve its impact resistance and fatigue resistance.

[0016] A further configuration of the utility model is: a hammer lifting ring is provided at the bottom of the piston rod, a second mounting portion is provided on the hammer lifting ring near one end of the piston rod, a first mounting hole for the first mounting portion to be plugged in is provided through the middle of the second mounting portion, and a second annular inclined surface corresponding to the first annular inclined surface is provided on the inner wall of the upper end of the first mounting hole, and the two are offset against each other, and a plurality of second mounting holes for fastener installation are provided along the circumferential direction on the top of the second mounting portion.

[0017] The above technical solution is adopted: through the setting of the hammer lifting ring, the second mounting part and the second annular inclined surface, the assembly of the hammer lifting ring and the piston rod is facilitated, and the strength of the piston rod is improved, and then connected to the hammer core through the hammer lifting ring; in addition, the setting of the second mounting hole and the installation of the fastener further improve the firmness of the installation between the hammer lifting ring and the piston rod.

[0018] The utility model is further configured as follows: a mounting block is disposed outside the outer cylinder, mounting shafts are symmetrically disposed on the mounting block, and reinforcing ribs are disposed between the top and bottom ends of the mounting block and the outer cylinder.

[0019] By adopting the above technical solution, the installation block and the installation shaft are arranged, so that the utility model and the hammer body can be easily installed. Meanwhile, due to the arrangement of the reinforcing ribs, the structural strength and stability are further improved.

[0020] A further configuration of the utility model is that a detachable cylinder cover is provided at the bottom of the outer cylinder.

[0021] The above technical solution is adopted: through the setting of a detachable cylinder cover, when the connection end between the piston rod and the hammer core is broken, it is only necessary to disassemble the cylinder cover, pull out the piston rod, and replace it with a new one. At the same time, due to the setting of the protective structure, maintenance personnel do not need to disassemble the valve block and check the channels and valve parts.

[0022] The utility model is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0024] Figure 2 It is a schematic diagram of the overall structure of the utility model in different states.

[0025] Figure 3 It is a cross-sectional view of the utility model.

[0026] Figure 4 For this utility model Figure 3 Enlarged view of point A in the middle.

[0027] Figure 5 This is a partial exploded view of Example 2 of the utility model.

[0028] Explanation of reference numerals: outer cylinder 1, annular oil passage 11, cylinder head 12, mounting block 13, mounting shaft 131, reinforcing rib 14, inner cylinder 2, hydraulic chamber 21, oil hole 22, piston assembly 3, piston rod 31, first mounting portion 311, first annular slope 312, piston 32, wear-resistant ring 321, limiting boss 322, valve block 4, flange 41, oil inlet passage 42, hammer lifting ring 5, second mounting portion 51, first mounting hole 511, second annular slope 512, second mounting hole 52. DETAILED DESCRIPTION

[0029] This specific embodiment and the drawings of the disclosed embodiments only involve structures related to the disclosed embodiments, and other structures may refer to general designs. In the absence of conflicts, the same embodiment and different embodiments of the utility model may be combined with each other.

[0030] Example 1: Figure 1-5The hydraulic assembly of a hydraulic pile hammer shown in the figure comprises an outer cylinder 1, an inner cylinder 2, a piston assembly 3 and a valve block 4, the valve block 4 is sleeved on the top of the outer cylinder 1 through a flange 41, the inner cylinder 2 is located in the inner cavity of the outer cylinder 1, and its top is located in the valve block 4, a removable cylinder cover 12 is provided at the bottom of the outer cylinder 1, a mounting block 13 is provided on the outer sleeve of the outer cylinder 1, mounting shafts 131 are symmetrically provided on the mounting block 13, and reinforcing ribs 14 are provided between the top and bottom ends of the mounting block 13 and the outer cylinder 1, a hollow hydraulic chamber 21 is provided in the inner cylinder 2, an oil inlet channel 42 which can be communicated with the hydraulic chamber 21 is provided between the valve block 4 and the inner cylinder 2, the piston assembly 3 is slidably arranged in the inner cavity of the inner cylinder 2, the piston assembly 3 comprises a piston rod 31 and a piston 32 penetrated on the piston rod 31, a wear-resistant ring 321 is provided on the piston 32, and a protective structure is provided on the upper end surface of the piston 32, and the protective structure can cause the wear-resistant ring 321 to always be located in the hydraulic chamber 21.

[0031] like Figure 3-4 The protective structure shown includes a limiting boss 322 connected to the upper end surface of the piston 32. The limiting boss 322 is sleeved on the piston rod 31 through a through hole in the middle. The diameter of the oil inlet channel 42 is smaller than the height of the limiting boss 322, and the diameter of the limiting boss 322 is smaller than the diameter of the piston 32.

[0032] like Figure 3 An annular oil passage 11 is provided between the outer cylinder 1 and the inner cylinder 2 , and a plurality of oil holes 22 are provided at the bottom of the inner cylinder 2 along the circumferential direction. The oil holes 22 can connect the hydraulic chamber 21 with the annular oil passage 11 .

[0033] Compared with the piston assembly 3 in the existing pile hammer, the utility model provides a limiting boss 322 on the piston 32. When the piston rod 31 and the hammer core are broken, the limiting boss 322 limits the wear-resistant ring 321, so that the wear-resistant ring 321 is always located in the hydraulic chamber 21 and will not enter the valve block 4. Therefore, if the wear-resistant ring 321 falls off, it will not fall into the oil channel of the valve block 4, causing valve jamming and other faults. When the piston rod 31 is broken, it is only necessary to disassemble the cylinder head 12, pull out the piston rod 31, and replace it with a new piston rod 31, so that the maintenance personnel do not need to disassemble the valve block 4 and check the channel and valve parts, thereby reducing the difficulty of maintenance. At the same time, the setting of the limiting boss 322 also avoids mechanical collision of the piston 32 with the channel.

[0034] Example 2: Figure 5 As shown, the structure of Example 2 is basically the same as that of Example 1, except that a first mounting portion 311 is provided at the lower end of the piston rod 31, the diameter of the first mounting portion 311 is smaller than the diameter of the piston rod 31, and a first annular inclined surface 312 is formed between the first mounting portion 311 and the piston rod 31.

[0035] like Figure 5As shown, a hammer lifting ring 5 is provided at the bottom of the piston rod 31, and a second mounting portion 51 is provided at the hammer lifting ring 5 near one end of the piston rod 31. A first mounting hole 511 for the first mounting portion 311 to be inserted is penetrated through the middle of the second mounting portion 51, and a second annular inclined surface 512 corresponding to the first annular inclined surface 312 is provided on the inner wall of the upper end of the first mounting hole 511, and the two are against each other, and a plurality of second mounting holes 52 for fastener installation are provided along the circumferential direction at the top of the second mounting portion 51.

[0036] Compared with the step positioning method adopted at the connection between the piston rod 31 and the lifting hammer ring 5 in the prior art, the utility model adopts a chamfer positioning method through the first and second mounting parts and the first and second annular inclined surfaces, so that the positioning area of ​​the piston rod 31 and the lifting hammer ring 5 is increased when they are assembled. At the same time, during use, the stress is no longer concentrated in a sharp corner, but is dispersed to a larger area, which can effectively reduce the local stress level, reduce the possibility of stress concentration, greatly improve the strength of the piston rod 31, and improve its impact resistance and fatigue resistance.

Claims

1. A hydraulic assembly of a hydraulic pile hammer, comprising an outer cylinder, an inner cylinder, a piston assembly and a valve block, wherein the valve block is sleeved on the top of the outer cylinder through a flange, the inner cylinder is located in the inner cavity of the outer cylinder, and its top is located in the valve block, a hollow hydraulic cavity is provided in the inner cylinder, an oil inlet channel which can be communicated with the hydraulic cavity is provided between the valve block and the inner cylinder, the piston assembly is slidably arranged in the inner cavity of the inner cylinder, the piston assembly comprises a piston rod and a piston penetrated on the piston rod, and a wear-resistant ring is provided on the piston, characterized in that: The upper end surface of the piston is provided with a protective structure, and the protective structure can cause the wear-resistant ring to always be located in the hydraulic cavity.

2. The hydraulic assembly of a hydraulic pile hammer according to claim 1, characterized in that: The protection structure comprises a limiting boss connected to the upper end surface of the piston, and the limiting boss is sleeved on the piston rod through a through hole provided in the middle.

3. The hydraulic assembly of a hydraulic pile hammer according to claim 2, characterized in that: The diameter of the oil inlet passage is smaller than the height of the limiting boss, and the diameter of the limiting boss is smaller than the diameter of the piston.

4. The hydraulic assembly of a hydraulic pile hammer according to claim 3, characterized in that: An annular oil passage is provided between the outer cylinder and the inner cylinder, and a plurality of oil holes are opened along the circumferential direction at the bottom of the inner cylinder, and the oil holes can conduct the hydraulic chamber with the annular oil passage.

5. The hydraulic assembly of a hydraulic pile hammer according to claim 1, characterized in that: A first mounting portion is provided at the lower end of the piston rod. The diameter of the first mounting portion is smaller than the diameter of the piston rod. A first annular inclined surface is formed between the first mounting portion and the piston rod.

6. The hydraulic assembly of a hydraulic pile hammer according to claim 5, characterized in that: A hammer lifting ring is provided at the bottom of the piston rod, and a second mounting portion is provided on the hammer lifting ring near one end of the piston rod. A first mounting hole for plugging the first mounting portion is provided through the middle of the second mounting portion, and a second annular inclined surface corresponding to the first annular inclined surface is provided on the inner wall of the upper end of the first mounting hole, and the two are offset from each other. A plurality of second mounting holes for installing fasteners are provided along the circumferential direction on the top of the second mounting portion.

7. The hydraulic assembly of a hydraulic pile hammer according to claim 1, characterized in that: The outer cylinder barrel is outer-circuited with a mounting block, the mounting block is symmetrically provided with mounting shafts, and reinforcing ribs are provided between the top and bottom ends of the mounting block and the outer cylinder barrel.

8. A hydraulic assembly for a hydraulic pile hammer according to any one of claims 1 to 7, characterized in that: A detachable cylinder cover is provided at the bottom of the outer cylinder.

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