Positioning pile lifting cylinder

Abstract

The utility model discloses a gauge pile lifting cylinder which comprises a base, a cylinder barrel, a guide sleeve, a piston rod and a piston. A front clamping seat and a rear clamping seat are fixedly arranged at the lower end in the cylinder barrel, a flange plate for fixing the rear clamping seat is fixedly arranged at the bottom of the cylinder barrel, a front end ball head of a ball head rod is arranged in the front clamping seat and the rear clamping seat, the front clamping seat and the rear clamping seat are respectively provided with an inner spherical surface matched with the ball head, a sealing ring is arranged on the inner spherical surface of the rear clamping seat, and the rear end of the ball head rod is connected with the base through threads. Connected rodless cavity oil ways are arranged in the base and the ball head rod; the ball head lubricating device is convenient to install, good in ball head lubricating effect, capable of improving the swing sensitivity of the cylinder barrel, small in starting pressure and capable of guaranteeing smooth lifting operation.

Description

TECHNICAL FIELD

[0001] The utility model relates to a positioning pile lifting cylinder, especially for the positioning pile lifting cylinder of dredger. BACKGROUND

[0002] The movement of the cutter suction dredger needs to be realized through the lifting cooperation of the positioning pile, and the positioning pile needs to swing within a certain range during the lifting process. Figure 1 As shown in the prior art, the positioning pile lifting cylinder comprises a base 1, a cylinder barrel 3, a guide sleeve 4, a piston rod 5 and a piston 6; a ball head 2 is integrally arranged on the upper end of the base 1, front and rear support seats 7 and 8 are fixedly arranged on the lower end of the cylinder barrel 3, the two support seats are provided with a spherical surface matched with the ball head, the rear support seat 8 is fixed through a flange 9, and the base 1 and the ball head 2 are provided with a connected rodless cavity oil path 10; through the cooperation of the ball head 2 and the spherical surface, the cylinder barrel 3 can swing within a certain range relative to the base 1; the structure is integrally connected with the base 1 and the ball head 2, in order to realize the assembly with the ball head, the rear support seat 8 needs to be a split structure, which leads to inconvenient installation, and the sealing ring 11 needs to be arranged on the inner circle of the front support seat 7, so that it is difficult to form an oil film on the rear part of the ball head, which affects the lubrication effect, increases the friction, reduces the sensitivity when the cylinder barrel swings, and has a certain influence on the lifting operation. SUMMARY

[0003] The utility model aims at the above-mentioned insufficient of prior art, provides a kind of positioning pile lifting cylinder, it is not only convenient to install, the lubrication effect of ball head is good, improve the sensitivity of cylinder barrel swing, and starting pressure is small, can guarantee the smooth progress of lifting operation.

[0004] To achieve the above object, the positioning pile lifting cylinder of the utility model, including base, cylinder barrel, guide sleeve, piston rod and piston;Its characterized in that the lower end of cylinder barrel is fixedly provided with front and rear clamping seats, and the bottom of cylinder barrel is fixedly provided with flange plate for fixing rear clamping seat, the front end ball head of a ball head rod is arranged in front and rear clamping seats, front and rear clamping seats are both provided with inner spherical surface matched with ball head, the inner spherical surface of rear clamping seat is provided with sealing ring, the rear end of ball head rod is connected with base by thread, and base and ball head rod are provided with connected rodless cavity oil path.

[0005] Since the rear end of ball head rod is connected with base by thread, rear clamping seat can be integral structure, front and rear clamping seats, ball head rod and flange plate are assembled, then ball head rod is connected with base, which is convenient to install;And sealing ring can be arranged in the inner spherical surface of rear clamping seat, which can form oil film on almost the whole ball head, improve the lubrication effect, reduce the friction, improve the sensitivity when cylinder barrel swings, which is beneficial to lifting operation;

[0006] As a further improvement of the utility model, the upper end of front clamping seat is provided with inner hole, and the lower end of piston rod is provided with buffer shaft matched with inner hole;When piston rod is retracted, end buffering can be realized to avoid impact.

[0007] As a further improvement of this utility model, the front jack is provided with an auxiliary oil passage connecting its front end face and the rear end of the inner hole, and a one-way valve is provided in the auxiliary oil passage; at the initial stage of piston rod extension, the thrust area can be increased and the starting pressure reduced to ensure the smooth progress of lifting operations.

[0008] As a further improvement of this utility model, the piston rod is provided with a step in the middle, and two spacers are provided in sequence outside the piston rod between the step and the piston. The gap between the spacer in contact with the step and the inner wall of the cylinder is smaller than the gap between the other spacer and the inner wall of the cylinder. For a long-stroke piston rod, the spacer with a small gap can increase the guide length and improve the stability of the oil cylinder.

[0009] As a further improvement of this utility model, the piston is provided with an oil passage hole connecting its upper and lower end faces; when the piston rod retracts, some oil can be discharged to the upper chamber of the piston, improving the retraction speed and ease of use.

[0010] In summary, this utility model is not only easy to install and provides good lubrication for the ball head, improving the sensitivity of the cylinder swing, but also has low starting pressure, ensuring smooth lifting operations. Attached Figure Description

[0011] Figure 1 This is the front view of the existing positioning pile lifting cylinder.

[0012] Figure 2 This is a front view of an embodiment of the present utility model. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings.

[0014] like Figure 2As shown, the positioning pile lifting cylinder of this embodiment includes a base 21, a cylinder 22, a guide sleeve 23, a piston rod 24, and a piston 25. A front retaining seat 26 and a rear retaining seat 27 are fixedly installed at the lower end of the cylinder 22. The cylinder 22 and the front retaining seat 26 have matching limiting steps. A flange 28 for fixing the rear retaining seat 27 is fixed to the bottom of the cylinder 22 by bolts. The front ball of a ball-head rod 29 is located within the front retaining seat 26 and the rear retaining seat 27. Both the front retaining seat 26 and the rear retaining seat 27 have inner spherical surfaces that mate with the ball head. The inner spherical surface of the rear retaining seat 27 has a sealing ring 30. The rear end of the ball-head rod 29 is threadedly connected to the base 21. The base 21 and... The ball joint 29 has a rodless chamber oil passage 31 connected to it; the upper end of the front locator 26 has an inner hole 32, and the lower end of the piston rod 24 has a buffer shaft 33 that mates with the inner hole 32; the front locator 26 has an auxiliary oil passage 34 that connects its front end face with the rear end of the inner hole 32, and a one-way valve 35 is provided in the auxiliary oil passage 34; the piston 25 has an oil passage 36 that connects its upper and lower end faces; the piston rod 24 has a step in the middle, and two spacers 37 and 38 are provided in sequence outside the piston rod 24 between the step and the piston 25. The gap between the spacer 37 that contacts the step and the inner wall of the cylinder 22 is 1.2 mm, which is smaller than the gap between the other spacer 38 and the inner wall of the cylinder 22.

[0015] In use, the base 21 is connected to the hull, and the positioning stake is connected to the piston rod 24. Through the inner spherical surface of the ball head and the front and rear spherical surfaces of the front and rear spherical seats 26 and 27, the cylinder 22 can swing relative to the base 21 within a certain range to meet the usage requirements. The extended piston rod 24 automatically retracts under the load. In this utility model, since the rear end of the ball head rod 29 is connected to the base 21 by a thread, the rear spherical seat 27 can be made into an integral structure. After the front spherical seat 26, rear spherical seat 27, ball head rod 29, sealing ring 30 and flange 28 are assembled, the ball head rod 29 is connected to the base 21, which is convenient for installation. Moreover, the sealing ring 30 is located on the inner spherical surface of the rear spherical seat 27, and oil can enter the gap outside the ball head surface to form an oil film on almost the entire ball head, which improves the lubrication effect, reduces friction, improves the sensitivity of the cylinder swing, and is beneficial for lifting operations.

[0016] The inner hole 32 cooperates with the buffer shaft 33 to achieve end buffering when the piston rod 24 retracts, thus avoiding impact.

[0017] At the initial stage of piston rod 24 extension, check valve 35 is opened, which can increase the thrust area, reduce the starting pressure, and ensure the smooth progress of lifting operation.

[0018] For long-stroke piston rods, the spacer 37 and cylinder 22 are designed with a small clearance. The spacer 37 can increase the guide length and improve the stability of the cylinder.

[0019] When the piston rod 24 retracts, the oil passage 36 can discharge some oil to the upper chamber of the piston, improving the retraction speed and ease of use.

Claims

1. A positioning pile lifting cylinder, comprising a base, a cylinder barrel, a guide sleeve, a piston rod and a piston; characterized in that The lower end of the cylinder is fixed with a front holder and a rear holder, the bottom of the cylinder is fixed with a flange plate for fixing the rear holder, the front end of a ball head rod is arranged in the front holder and the rear holder, the front holder and the rear holder are both provided with an inner spherical surface matched with the ball head, the inner spherical surface of the rear holder is provided with a sealing ring, the rear end of the ball head rod is connected with the base through a thread, and the base and the ball head rod are both provided with a connected rodless cavity oil path.

2. The positioning pile lifting cylinder of claim 1, wherein The upper end of the front holder is provided with an inner hole, and the lower end of the piston rod is provided with a buffer shaft matched with the inner hole.

3. A positioning pile lifting cylinder as claimed in claim 1 or 2, characterized in that The front holder is provided with an auxiliary oil path connected with the front end surface and the rear end of the inner hole, and the auxiliary oil path is provided with a one-way valve.

4. The positioning pile lifting cylinder of claim 3, wherein The middle part of the piston rod is provided with a step, and two sections of spacer sleeves are sequentially arranged outside the piston rod between the step and the piston, the gap between the spacer sleeve in contact with the step and the inner wall of the cylinder is smaller than the gap between the other spacer sleeve and the inner wall of the cylinder.

5. The positioning pile lifting cylinder according to claim 4, characterized in that The piston is provided with an oil passing hole connected with the upper and lower end surfaces.

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