Backoff hydraulic cylinder pile hammer

Abstract

The utility model discloses a back-off type hydraulic cylinder pile hammer which comprises a pile hammer body and a hydraulic cylinder, a pile hammer cylinder hole is formed in the pile hammer body, a hydraulic cylinder body of the hydraulic cylinder can be movably sleeved with the pile hammer cylinder hole, and a piston rod of the hydraulic cylinder penetrates through the pile hammer cylinder hole to be fixedly connected to the lower portion of the pile hammer body. A valve block is fixedly installed at the upper end of the hydraulic cylinder body, a cylinder cavity oil chamber and a cylinder hole oil chamber are arranged on the valve block, the cylinder cavity oil chamber leads to a cylinder cavity of the hydraulic cylinder body, and the cylinder hole oil chamber leads to the cylinder cavity of the hydraulic cylinder body through a cylinder body oil hole in the cylinder wall of the hydraulic cylinder body. The hole diameter of the pile hammer cylinder hole is larger than the cylinder body outer diameter of the hydraulic cylinder body. The lower end of the piston rod is connected with the pile hammer through a sliding pair, and a plurality of cylinder body oil holes are formed in the cylinder wall of the hydraulic cylinder body, are parallel to the center line of the hydraulic cylinder body and are evenly distributed around the cylinder wall. And the lower end of the cylinder body oil hole is communicated with the barrel cavity of the hydraulic cylinder body through the cylinder body oil through hole. A pile hammer head is fixedly installed on the bottom end face of the pile hammer. The pile hammer not only can reduce oil path pipelines outside the hammer, but also can realize high energy ratio.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of hydraulic pile hammers for building foundation construction, especially the improvement of hydraulic pile hammer middle hydraulic cylinder and pile hammer core connection structure. BACKGROUND

[0002] Hydraulic pile hammer has the characteristics of high pile driving efficiency, high impact energy and high impact frequency, which can meet the construction requirements of large foundation piles. The hydraulic cylinder of the existing guide rod type hydraulic pile hammer is supported on the upper cross beam, and the lower end of the piston rod of the hydraulic cylinder is connected with the top surface of the pile hammer. This structure of the hydraulic pile hammer has the following defects in use: first, the overall height of the hydraulic pile hammer is at least the sum of the length of the hydraulic cylinder when the piston rod is extended and the height of the pile hammer body. The extension length of the piston rod determines the lifting range of the pile hammer along the guide rod. The lifting range and the weight of the pile hammer directly determine the impact energy of the hydraulic hammer. The greater the impact energy of the hydraulic hammer, the greater the extension and retraction stroke of the piston rod, the weight of the pile hammer and the height of the pile hammer. This results in a large overall height and weight of the hydraulic hammer, which brings great inconvenience to the transportation and installation of the hydraulic hammer. Moreover, the weight of the supporting components of the hydraulic hammer that do not generate impact energy accounts for a large proportion, which reduces the ratio of the impact energy of the pile hammer to the total weight of the pile hammer. Second, the existing pile hammer hydraulic cylinder includes many assembled parts and various hydraulic oil inlet and outlet pipelines. Under severe impact and vibration conditions, leakage is likely to occur. The excessive external oil pipeline is prone to entanglement and impact during frequent reciprocating impact of the pile hammer, increasing the failure rate of the impact operation. Moreover, the sliding core control valve structure used in the existing hydraulic hammer is complex, has small flow rate, large pressure loss, weak resistance to oil contamination, low action sensitivity and slow response speed of the valve body, which restricts the impact frequency and impact energy of the hydraulic hammer. SUMMARY

[0003] To solve the above-mentioned problems of the prior art, the utility model provides a reverse-docking type hydraulic cylinder pile hammer, which can greatly reduce the external oil pipeline of the hydraulic hammer and effectively improve the ratio of the impact energy of the pile hammer to the total weight.

[0004] To solve the above-mentioned problems, the reverse-docking type hydraulic cylinder pile hammer of the utility model includes a pile hammer and a hydraulic cylinder. A pile hammer cylinder hole is provided on the pile hammer. The pile hammer cylinder hole is movably sleeved to the hydraulic cylinder body of the hydraulic cylinder. The piston rod of the hydraulic cylinder passes through the pile hammer cylinder hole and is fixedly connected to the lower part of the pile hammer. A valve block is fixedly installed on the upper end of the hydraulic cylinder body. A cylinder cavity oil chamber and a cylinder hole oil chamber are provided on the valve block. The cylinder cavity oil chamber leads to the cylinder cavity of the hydraulic cylinder body. The cylinder hole oil chamber leads to the cylinder cavity of the hydraulic cylinder body through the cylinder body oil hole on the cylinder wall of the hydraulic cylinder body.

[0005] The utility model discloses an improved embodiment, the hydraulic cylinder includes hydraulic cylinder body and piston, and the upper cylinder cover and lower cylinder cover are fixedly installed respectively at the both ends of the hydraulic cylinder body, and the piston rod fixedly connected with the piston respectively seals and passes through the upper cylinder cover and lower cylinder cover and extends outward to the both ends. The cylinder cavity oil chamber leads to the cylinder cavity of the hydraulic cylinder body on the upside of the piston, and the cylinder hole oil chamber leads to the upper end of the cylinder body oil hole on the cylinder wall of the hydraulic cylinder body, and the lower end of the cylinder body oil hole is communicated with the cylinder cavity of the hydraulic cylinder body on the downside of the piston.

[0006] The utility model discloses an improved embodiment, the valve block is connected with inlet and outlet oil pipe, and inlet and outlet oil pipe leads to the cylinder cavity oil chamber and cylinder hole oil chamber through corresponding plug-in valve.

[0007] The utility model discloses an improved embodiment, the hole diameter of stake hammer cylinder hole is greater than the cylinder body outer diameter of hydraulic cylinder body.

[0008] The utility model discloses an improved embodiment, and the lower end of the piston rod is connected with stake hammer through the sliding pair, and the sliding pair includes the upper sliding body installed on stake hammer and the lower sliding body installed on the piston rod, and the upper sliding body and lower sliding body slidably contact each other. The contact sliding surface of the upper sliding body and lower sliding body is plane or spherical surface.

[0009] The utility model discloses an improved embodiment, and the cylinder wall of the hydraulic cylinder body is provided with a plurality of cylinder body oil holes, and the cylinder body oil hole is parallel to the center line of the hydraulic cylinder body and is evenly arranged around the cylinder wall, and the lower end of the cylinder body oil hole is communicated with the barrel cavity of the hydraulic cylinder body through the cylinder oil hole.

[0010] The utility model discloses an improved embodiment, and the bottom end face of stake hammer is fixedly installed with stake hammer head.

[0011] In the above structure, because the pile hammer has a pile hammer cylinder hole, the piston rod of the hydraulic cylinder passes through the pile hammer cylinder hole and is fixedly connected to the lower part of the pile hammer in an inverted manner. When the hydraulic hammer is lifted, the cylinder body of the hydraulic cylinder can be inserted into the pile hammer cylinder hole, so that the lifting extension stroke of the hydraulic cylinder piston rod overlaps in the pile hammer cylinder hole. This can greatly shorten the overall height of the hydraulic pile hammer, thereby reducing the weight of non-impact energy-generating support components such as the guide rod while ensuring the same impact energy. This also increases the ratio of impact energy to the total weight of the pile hammer, forming a structure with a high impact energy ratio. At the same time, the reduction in the overall height of the pile hammer not only facilitates the transportation of the hydraulic hammer, but also makes it easier and safer to install and debug the pile hammer on the construction site. Furthermore, by setting cylinder oil holes on the cylinder wall and directly fixing the hydraulic control valve block to the upper end of the hydraulic cylinder body, this structure not only avoids external pressure oil delivery pipelines, preventing impact and entanglement of external oil pipes, but also reduces oil connection points, preventing oil leakage and improving the working stability and reliability of the hydraulic cylinder. Directly mounting the valve block and cylinder head onto the hydraulic cylinder body not only improves the installation accuracy of key components such as the hydraulic cylinder and valve block, making the hydraulic cylinder structure more compact, but also enhances the overall rigidity and structural strength of the hydraulic cylinder, making it more suitable for reliable operation in impact and vibration environments. Using a guide rod as the guide component for the pile driver makes the hammer's guiding action more reliable, with flexible movement and good directionality, further expanding its applicability. Moreover, using a guide rod as the guide component facilitates processing, manufacturing, and installation, which helps ensure the movement accuracy of the pile driver. Attached Figure Description

[0012] The inverted hydraulic cylinder pile hammer of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0013] Figure 1 This is a cross-sectional structural diagram of a specific embodiment of the inverted hydraulic cylinder pile hammer of this utility model;

[0014] Figure 2 yes Figure 1 Structural diagram of the hydraulic cylinder in the diagram;

[0015] Figure 3 yes Figure 1 The structural diagram of the pile hammer in the middle;

[0016] Figure 4 yes Figure 3 Top view.

[0017] In the diagram, 1—pile hammer, 2—cylinder body sleeve, 3—lower cylinder head, 4—piston, 5—piston rod, 6—hydraulic cylinder body, 7—valve block, 8—upper cylinder head, 9—cylinder chamber oil chamber, 10—cylinder bore oil chamber, 11—inlet and outlet oil pipes, 12—cylinder body oil hole, 13—cylinder body connecting oil hole, 14—locking nut, 15—pile hammer pad, 16—pile hammer head, 17—sliding body, 18—upper sliding body, 19—pile hammer cylinder bore. Detailed Implementation

[0018] like Figure 1 , Figure 2 , Figure 3 and Figure 4 The inverted hydraulic cylinder pile hammer shown includes a hydraulic cylinder body 6 and a piston 4. The piston 4 is slidably disposed within the cylinder cavity of the hydraulic cylinder body 6. Piston rods 5 extending outwards are disposed on both sides of the piston 4. The piston 4 and its piston rods 5 at both ends are an integral structure. Twelve cylinder oil holes 12 are provided on the cylinder wall of the hydraulic cylinder body 6, evenly distributed around the circumference of the cylinder wall and parallel to the centerline of the hydraulic cylinder body 6. An upper cylinder cover 8 is sealed and fitted into the upper end of the cylinder cavity of the hydraulic cylinder body 6, and a lower cylinder cover 3 is sealed and fitted into the lower end of the cylinder cavity of the hydraulic cylinder body 6. The piston rods 5 at both ends of the piston 4 extend in a sealed manner through the upper cylinder cover 8 and the lower cylinder cover 3, respectively, thus forming a double-rod hydraulic cylinder. Of course, this hydraulic cylinder can also be a single-rod hydraulic cylinder.

[0019] A valve block 7 is fixedly mounted on the upper end of the hydraulic cylinder body 6. The valve block 7 has a cylinder chamber oil chamber 9 and a cylinder bore oil chamber 10, which are arranged in a ring shape. The cylinder chamber oil chamber 9 is directly connected to the cylinder chamber of the hydraulic cylinder body 6 located above the piston 4. The cylinder bore oil chamber 10 is connected to the upper end of each cylinder oil hole 12. The lower end of the cylinder oil hole 12 is connected to the cylinder chamber of the hydraulic cylinder body 6 located below the piston 4 through the corresponding cylinder connecting oil hole 13. When high-pressure hydraulic oil enters the cylinder chamber of the hydraulic cylinder body 6 below the piston 4 from the cylinder bore oil chamber 10, cylinder oil hole 12, and cylinder connecting oil hole 13, the hydraulic oil in the cylinder chamber of the hydraulic cylinder body 6 above the piston 4 returns through the cylinder chamber oil chamber 9. A cartridge valve core is installed on the valve block 7. The inlet and outlet oil pipes 11 are connected to the cylinder chamber oil chamber 9 and the cylinder bore oil chamber 10 through the cartridge valve oil passage on the valve block 7. In this embodiment, the hydraulic cylinder and the control oil circuit on its valve block 7 constitute a differential hydraulic cylinder.

[0020] The center line position of the pile hammer 1 is provided with a pile hammer cylinder hole 19, and two guide rod holes are further provided on the pile hammer 1, and the pile hammer cylinder hole 19 is located between the two guide rod holes. A cylinder sheath 2 is fixedly installed on the upper end surface of the pile hammer 1, the cylinder sheath 2 is located at the upper hole end of the pile hammer cylinder hole 19, the pile hammer cylinder hole 19 is movably sleeved to the hydraulic cylinder 6, so that the hydraulic cylinder 6 reciprocates along the hole center line in the sleeve hole of the pile hammer cylinder hole 19 and the cylinder sheath 2, and a nylon sealing ring plate is embedded on the upper hole edge of the cylinder sheath 2.

[0021] A mounting groove of the piston rod 5 is arranged on the lower end surface of the pile hammer 1, an upper sliding body 18 is fixedly installed on the groove bottom of the pile hammer 1 through a pressing block and a bolt, a lower sliding body 17 is installed on the lower rod end of the piston rod 5 through the pile hammer cylinder hole 19 and the upper sliding body 18, and the lower sliding body 17 is fixedly installed on the rod end of the piston rod 5 through a locking nut 14 of the piston rod 5. The upper sliding body 18 and the lower sliding body 17 are circular hole plates that can slide relative to each other, and the structure can eliminate the radial offset force of the pile hammer 1 on the piston rod, and avoid the generation of bending moment on the piston rod to affect the normal reciprocating motion and service life of the piston rod. The contact sliding surfaces of the upper sliding body 18 and the lower sliding body 17 in the above embodiment can be flat, and can also be spherical. The locking nut 14 includes two nuts that are tightly connected to each other and have different pitches, so as to form a locking structure. A pile hammer head 16 is fixedly installed on the bottom end surface of the pile hammer 1, and the center line of the pile hammer head 16 is collinear with the hammer center line of the pile hammer 1. According to the size of the lifting hammer reciprocating stroke, the pile hammer pad 15 can be installed at the position of the pile hammer head 16 and the piston rod 5 mounting groove opening end of the pile hammer 1.

[0022] The above only lists some preferred embodiments of the present application, but the present application is not limited thereto, and many improvements and changes can be made. As long as the improvements and changes are made on the basis of the basic principles of the present application, they should be considered to fall within the protection scope of the present application.

Claims

1. A reverse-draft hydraulic cylinder pile hammer comprising a pile hammer (1) and a hydraulic cylinder, characterized in that: The pile hammer (1) is provided with a pile hammer cylinder hole (19) movably sleeving a hydraulic cylinder body (6) of a hydraulic cylinder, a piston rod (5) of the hydraulic cylinder is fixedly connected to a lower part of the pile hammer (1) through the pile hammer cylinder hole (19); an upper end of the hydraulic cylinder body (6) is fixedly installed with a valve block (7), a cylinder cavity oil chamber (9) and a cylinder hole oil chamber (10) are arranged on the valve block (7), the cylinder cavity oil chamber (9) is communicated with a cylinder cavity of the hydraulic cylinder body (6), and the cylinder hole oil chamber (10) is communicated with the cylinder cavity of the hydraulic cylinder body (6) through a cylinder body oil hole (12) on a cylinder wall of the hydraulic cylinder body (6).

2. The inverted hydraulic cylinder pile hammer according to claim 1, characterized in that: The hydraulic cylinder comprises the hydraulic cylinder body (6) and a piston (4), and an upper cylinder cover (8) and a lower cylinder cover (3) are fixedly installed at two ends of the hydraulic cylinder body (6) respectively, and a piston rod (5) fixedly connected with the piston (4) extends outward through the upper cylinder cover (8) and the lower cylinder cover (3) in a sealed mode respectively at two ends.

3. The inverted hydraulic cylinder pile driver of claim 2, wherein: The cylinder cavity oil chamber (9) is communicated with a cylinder cavity of the hydraulic cylinder body (6) located on an upper side of the piston (4), and the cylinder hole oil chamber (10) is communicated with an upper end of the cylinder body oil hole (12) on the cylinder wall of the hydraulic cylinder body (6), and a lower end of the cylinder body oil hole (12) is communicated with a cylinder cavity of the hydraulic cylinder body (6) located on a lower side of the piston (4).

4. The inverted hydraulic cylinder pile driver of claim 1, wherein: The valve block (7) is communicated with an oil inlet and outlet pipe (11), and the oil inlet and outlet pipe (11) is communicated with the cylinder cavity oil chamber (9) and the cylinder hole oil chamber (10) through corresponding plug-in valves.

5. The inverted hydraulic cylinder pile driver of claim 1, wherein: A hole diameter of the pile hammer cylinder hole (19) is greater than an outer diameter of the hydraulic cylinder body (6).

6. The inverted hydraulic cylinder pile driver of claim 1, wherein: A lower end of the piston rod (5) is connected with the pile hammer (1) through a sliding pair, the sliding pair comprises an upper sliding body (18) installed on the pile hammer (1) and a lower sliding body (17) installed on the piston rod (5), and the upper sliding body (18) and the lower sliding body (17) are in slidable contact with each other.

7. The inverted hydraulic cylinder pile driver of claim 6, wherein: Contact sliding surfaces of the upper sliding body (18) and the lower sliding body (17) are planes or spherical surfaces.

8. The inverted hydraulic cylinder pile driver of claim 1, wherein: A plurality of cylinder body oil holes (12) are arranged on a cylinder wall of the hydraulic cylinder body (6), the cylinder body oil holes (12) are parallel to a center line of the hydraulic cylinder body (6) and are uniformly arranged around the cylinder wall, and lower ends of the cylinder body oil holes (12) are communicated with a barrel cavity of the hydraulic cylinder body (6) through cylinder communication oil holes (13).

9. The inverted hydraulic cylinder pile driver of claim 1, wherein: A pile hammer head (16) is fixedly installed on a bottom end surface of the pile hammer (1).

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