CN113752058A

CN113752058A - Special flexible centre gripping frock of propeller leading edge along with limit processing

Info

Publication number: CN113752058A
Application number: CN202110999634.2A
Authority: CN
Inventors: 刘志峰; 赵鹏睿; 赵永胜; 李志雄; 苏李航; 姚佳茹
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2021-08-29
Filing date: 2021-08-29
Publication date: 2021-12-07

Abstract

The invention discloses a special flexible clamping tool for processing a guide edge and a following edge of a propeller, which is a flexible clamping tool specially used for processing the guide edge and the following edge of a large-scale marine propeller. The hydraulic lifting platform consists of a sliding block, a damping spring, an oil inlet, an oil outlet, a control port, an oil drainage port and a push rod. Has the advantages that: the flexible clamping tool is used for fixing and clamping the guide edge or the following edge of the propeller, so that the vibration in the machining process can be reduced, the machining precision is improved, the time for manual polishing in the later period is saved, and the labor cost is greatly reduced.

Description

Special flexible centre gripping frock of propeller leading edge along with limit processing

Technical Field

The invention relates to a special flexible clamping tool for processing a guide edge of a propeller along the edge, and belongs to the technical field of large-scale marine propellers.

Background

The shape of the large ship propeller is very complex, all blades of the large ship propeller are overlapped, the thickness distribution is also very uneven, the curvature change of the blades in the area close to the blade tip is large, the blades are thin, and the propeller is easy to deviate and vibrate during milling, so that the propeller must be fixed. In the milling process, the stress of the propeller belongs to a cantilever beam form, and at the position of the processed blade tip, the deformation of the blade tip area is the largest, the vibration is the most violent, and a larger processing error can be generated. Therefore, the blade back of the propeller needs to be supported during processing, so that the stress of the blade back is changed into two-end support, and the vibration of the blade surface is greatly reduced. However, the support is added at the blade back of the propeller, which only has the function of locally reducing vibration, and the vibration reduction effect on the leading edge and the trailing edge of the blade edge is not obvious, so the requirement of developing a flexible clamping tool specially used for processing the leading edge and the trailing edge of the large-scale marine propeller is particularly urgent.

At present, China still depends on the traditional blade back bottom supporting operation in the aspect of processing and supporting large ship propellers, and the flutter inhibiting effect of the traditional blade back bottom supporting operation on the leading edge and trailing edge parts is not obvious.

Disclosure of Invention

The invention realizes the purpose through the following technical scheme:

a special flexible clamping tool for processing a propeller guide edge along with an edge comprises a cylinder, an end pressure head, a movable block, a connecting spring, a connecting rod mechanism, a bottom pressing block, a positioning bolt group, a hydraulic lifting platform and a hydraulic control panel. The hydraulic lifting platform consists of a sliding block, a damping spring, an oil inlet, an oil outlet, a control port, an oil drainage port and a push rod.

In this embodiment, when the cylinder stretches out, the cylinder pushes down along the push rod, meanwhile, the cylinder pushes the first movable block to move downward, the second movable block moves upward and in the opposite direction under the action of the link mechanism, and the first movable block and the second movable block are connected through the connecting spring to play a role in reducing speed and damping. A bottom pressing block is arranged below the second movable block, so that the second movable block can be prevented from moving downwards. Each installs 3 positioning bolt on first movable block and second movable block, and the bolt bottom is semi-circular, because the blade shape is complicated and camber everywhere is different, positioning bolt can be better carry out the centre gripping to the leading edge and the trailing edge of blade.

In the embodiment, the hydraulic lifting platform is a device for controlling the flexible clamping tool to ascend and descend, when the flexible clamping tool ascends, high-pressure oil passes through the lower part of the oil cylinder, the oil cylinder is pushed to ascend by virtue of the ejector rod, and the force is transmitted to the sliding block by virtue of the damping spring so as to drive the platform to ascend; when the hydraulic oil cylinder descends, the vane pump stops, the control valve opens the oil drainage loop, the platform slowly descends under the action of self weight, and hydraulic oil in the oil cylinder is squeezed out for oil drainage.

Drawings

Fig. 1 is a schematic structural diagram of a special flexible clamping tool for processing a leading edge and a trailing edge of a propeller according to the invention.

Fig. 2 is a sectional view of a hydraulic lifting table of a flexible clamping tool special for processing a leading edge of a propeller along an edge.

Fig. 3 is a schematic diagram of an embodiment of the present invention.

The reference numerals are explained below:

1. a cylinder; 2. an end indenter; 3. a first movable block; 4. a connecting spring; 5. a second movable block; 6. pressing a block at the bottom; 7. a hydraulic lifting platform; 8. a hydraulic control panel; 9. a positioning bolt 1; 10. a positioning bolt 2; 11. a positioning bolt 3; 12. a link mechanism; 13. a positioning bolt 4; 14 positioning bolt 5; and 15, positioning the bolt 6.

701. A slider; 702. an oil drainage port; 703. an oil outlet; 704. a control port; 705. a damping spring; 706. an oil inlet; 707. a push rod.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

a special flexible clamping tool for processing a leading edge of a propeller along the edge comprises a tool body 1 and a cylinder; 2. an end indenter; 3. a first movable block; 4. a connecting spring; 5. a second movable block; 6. pressing a block at the bottom; 7. a hydraulic lifting platform; 8. a hydraulic control panel; 9. a positioning bolt 1; 10. a positioning bolt 2; 11. a positioning bolt 3; 12. a link mechanism; 13. a positioning bolt 4; 14 positioning bolt 5; 15 positioning bolt 6; 701. a slider; 702. an oil drainage port; 703. an oil outlet; 704. a control port; 705. a damping spring; 706. an oil inlet; 707. a push rod.

The cylinder 1 is connected with a first movable block 3 through an end pressure head 2, and a positioning bolt (9, a

positioning bolt

1, 10, a

positioning bolt

2, 11 and a positioning bolt 3) is arranged on the first movable block 3; the second movable block 5 is arranged opposite to the first movable block 3, and the second movable block 5 is also provided with a positioning bolt (13, a positioning bolt 4; 14, a positioning bolt 5; 15, a positioning bolt 6); the first movable block 3 is connected with the positioning bolt mounting plate on the second movable block 5 through a connecting spring; the bottom of the second movable block 5 is connected with a bottom pressing block 6; the integral structure that cylinder 1, tip pressure head 2, first movable block 3, coupling spring 4, second movable block 5, bottom briquetting 6 are constituteed is installed on hydraulic elevating platform 7, and hydraulic elevating platform 7 is connected with hydraulic control board 8.

The hydraulic lifting platform 7 is communicated with an oil drainage port 702, an oil outlet 703, a control port 704 and an oil inlet 706 through a flow passage; the slider 701 communicates with the drain port 702 through a damper spring 705, and the control port 704 communicates with the flow passage through a push rod 707.

In the numerical control course of working of propeller, can select to support the frock and support the cooperation to the blade bottom, be used for fixing the blade tip position of blade with flexible centre gripping frock simultaneously. The specific operation mode is that the height of the flexible tool is adjusted by treading the hydraulic control board to reach the appropriate height. And when the cylinder extends out, the cylinder pushes downwards along the push rod, meanwhile, the first movable block is pushed by the cylinder to move downwards, the second movable block moves upwards and reversely under the action of the connecting rod mechanism, and the first movable block and the second movable block are connected by a connecting spring to play a role in reducing speed and vibration. The bottom pressing block is arranged below the second movable block, plays a role in fixing, and can prevent the second movable block from moving downwards. After the positions of the first movable block and the second movable block are adjusted, the

positioning bolts

1, 2 and 3 are sequentially adjusted to be completely attached to the upper parts of the blades, the bottoms of the positioning bolts are hemispherical, and the positioning bolts are in point contact with the blades. After the

positioning bolts

1, 2 and 3 are adjusted, the

positioning bolts

4, 5 and 6 are sequentially adjusted to be completely attached to the bottom of the blade, the bottom of each positioning bolt is hemispherical, and the bottom of each positioning bolt is in point contact with the blade. After the positioning screw is completely fixed in position, the blade of the propeller can be machined today. After the processing is finished, firstly, the

positioning bolts

1, 2, 3, 4, 5 and 6 are adjusted to be far away from the blades, then the cylinder returns, the first movable block and the second movable block return to the original position, meanwhile, the vane pump stops working, the control valve opens the oil drainage loop, and the hydraulic lifting platform slowly descends under the action of self weight. In this way, the propeller is stressed to become two-end supported, which greatly reduces the vibration of the blade surface.

Claims

1. The utility model provides a special flexible centre gripping frock of propeller leading edge along with limit processing which characterized in that: the hydraulic lifting platform comprises a cylinder, an end pressure head, a movable block, a connecting spring, a connecting rod mechanism, a bottom pressing block, a positioning bolt group, a hydraulic lifting platform and a hydraulic control panel; the hydraulic lifting platform consists of a sliding block, a damping spring, an oil inlet, an oil outlet, a control port, an oil drainage port and a push rod;

the cylinder extends out, the cylinder pushes downwards along the push rod, meanwhile, the first movable block is pushed to move downwards by the cylinder, the second movable block moves upwards and reversely under the action of the connecting rod mechanism, and the first movable block and the second movable block are connected through a connecting spring to play a role in reducing speed and vibration; a bottom pressing block is arranged below the second movable block to play a role in fixing and prevent the second movable block from moving downwards; the first movable block and the second movable block are respectively provided with three positioning bolts, the bottoms of the bolts are semicircular, and the positioning bolts can better clamp the leading edge and the trailing edge of the blade due to the complex shape of the blade and different curvatures at each part;

the hydraulic lifting platform is a device for controlling the flexible clamping tool to ascend and descend, and when the flexible clamping tool ascends, high-pressure oil passes through the lower part of the oil cylinder, pushes the oil cylinder to ascend by virtue of the ejector rod, and transmits force to the sliding block by virtue of the damping spring so as to drive the platform to ascend; when the hydraulic oil cylinder descends, the vane pump stops, the control valve opens the oil drainage loop, the platform slowly descends under the action of self weight, and hydraulic oil in the oil cylinder is squeezed out for oil drainage.

2. The special flexible clamping tool for the edge following processing of the guide edge of the propeller according to claim 1, wherein the flexible clamping tool comprises: in the numerical control course of working of propeller, choose for use to support the frock and support the cooperation to the blade bottom, be used for the flexible centre gripping frock simultaneously to fix the blade tip position of blade.

3. The special flexible clamping tool for the edge following processing of the guide edge of the propeller according to claim 1, wherein the flexible clamping tool comprises: the height of the flexible tool is adjusted by treading the hydraulic control panel to reach a proper height; when the cylinder extends out, the cylinder pushes downwards along the push rod, the first movable block is pushed by the cylinder to move downwards, the second movable block moves upwards and reversely under the action of the connecting rod mechanism, and the first movable block and the second movable block are connected through a connecting spring to play a role in reducing speed and vibration; the bottom pressing block is arranged below the second movable block; after the positions of the first movable block and the second movable block are adjusted, the positioning bolts 1, 2 and 3 are sequentially adjusted to be completely attached to the upper parts of the blades, the bottoms of the positioning bolts are hemispherical, and the contact with the blades is point contact; after the positioning bolts 1, 2 and 3 are adjusted, the positioning bolts 4, 5 and 6 are sequentially adjusted to be completely attached to the bottom of the blade, the bottom of each positioning bolt is hemispherical, and the contact between each positioning bolt and the blade is point contact; after the positioning screw is completely fixed in position, processing blades of the propeller; after the machining is finished, firstly, the positioning bolts 1, 2, 3, 4, 5 and 6 are adjusted to be far away from the blades, then the cylinder returns, the first movable block and the second movable block return to the original positions, meanwhile, the vane pump stops working, the control valve opens the oil drainage loop, and the hydraulic lifting platform slowly descends under the action of self weight.