An inner support mechanism for a cylinder section

Abstract

The present invention relates to the field of pre-welding machining, and particularly to an inner support mechanism for a cylinder section. The mechanism includes: a base body with a central opening, provided with an eccentric wheel and a positioning block, both the eccentric wheel and the positioning block protruding above the surface of the base body; the outer edge of the base body is provided with a plurality of linear slide rails radiating from the central opening towards the edge; a turntable with a central opening, corresponding to the central opening of the base body, coaxially installed on the base body and rotating around the base body; the turntable is evenly provided with lugs, and a stop block protruding above the back surface of one lug is arranged, the stop block and the eccentric wheel and the positioning block are on the same pitch circle, and the stop block is between the eccentric wheel and the positioning block; one end of a cylinder is connected to the base body, and the other end is connected to the lug; a force-increasing connecting rod, one end is connected to the turntable, and the other end is connected to a support block; the back of the support block is connected to the linear slide rail; a cushion block is connected to the end of the support block opposite to the force-increasing connecting rod. The present invention meets the product dimensional accuracy requirements, improves the inner support accuracy, and improves the automation level.

Description

Technical Field

[0001] The present invention relates to the field of pre-welding machining, and particularly to an inner support mechanism for a cylinder section. Background Art

[0002] In order to meet the technical requirements of circumferential seam welding between cylinder sections or between a cylinder section and a tank bottom, and to ensure the welding quality, it is necessary to remove the longitudinal margins at both ends of the cylinder section before welding and ensure that the end plane is perpendicular to the axis of the cylinder section, and the circumferential welding groove is uniform on the entire end face circumference. To achieve the above objectives, it is necessary to design an inner support mechanism to ensure good roundness after the end of the cylinder section is tightened, and at the same time, it is easy to adjust the radial position of the support block, which is convenient for product assembly and disassembly.

[0003] Currently, there are mainly two types of inner support mechanisms used in China: one is to manually adjust the support blocks radially one by one along the circumferential direction through a screw-nut structure, which is inconvenient to adjust and has poor inner support accuracy; the other is to arrange opposed cylinders radially along the support blocks, and at the same time, it is equipped with mechanical limits. This support structure is relatively bulky, requires a large tightening force, and also has poor inner support accuracy. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an inner support mechanism for a cylinder section, which meets the product dimensional accuracy requirements, improves the inner support accuracy, and improves the automation level.

[0005] The present invention provides an inner support mechanism for a cylinder section, including:

[0006] A base body with a central opening, on which an eccentric wheel and a positioning block are provided. The eccentric wheel and the positioning block both protrude above the surface of the base body, have the same height and are located on the same pitch circle; on the outer edge of the base body, several linear slide rails are radially arranged from the central opening to the edge;

[0007] A turntable with a central opening, corresponding to the central opening of the base body, coaxially installed on the base body and rotating around the base body; several lugs are evenly arranged on the turntable, and a stop block is provided on the back of one of the lugs. The stop block protrudes above the back of the lug. The stop block, the eccentric wheel and the positioning block are on the same pitch circle, and the stop block is between the eccentric wheel and the positioning block; the rotation angle of the turntable is limited by limiting the stop block through the positioning block and the eccentric wheel;

[0008] A cylinder, one end of which is connected to the base body through a cylinder connecting shaft, and the other end is connected to the lug of the turntable;

[0009] A force-increasing connecting rod, one end of which is connected to the turntable and the other end is connected to the support block;

[0010] The back of the support block is connected to the linear slide rail;

[0011] A cushion block is connected to the end of the support block opposite to the force-increasing connecting rod.

[0012] Preferably, the turntable is mounted on the base through a bearing and a bushing.

[0013] Preferably, the inner surface of the bearing is sleeved on the outer surface of the bushing, and the outer surface of the bearing is sleeved on the inner surface at the center of the turntable.

[0014] Preferably, the turntable and the base are circular, and the diameter of the turntable is smaller than that of the base.

[0015] Preferably, the angle between the eccentric wheel and the positioning block is 30°, and the pitch diameter is 800 mm to 1000 mm.

[0016] Preferably, 6 to 10 lugs are uniformly arranged on the turntable, and each lug is connected to a cylinder.

[0017] Preferably, 12 to 16 force-increasing connecting rods are provided, and the force-increasing connecting rods are uniformly distributed around the turntable.

[0018] Preferably, when the cut-off block contacts the eccentric wheel, fine adjustment of the cut-off block is realized through the rotation of the eccentric wheel, and further fine adjustment of the turntable is realized.

[0019] Preferably, a expansion sleeve is further arranged on the inner surface of the bushing for close contact with the shaft.

[0020] Preferably, a plurality of relief holes are further arranged around the opening at the center of the base.

[0021] Compared with the prior art, the inner support mechanism of the cylinder section of the present invention has the following beneficial effects:

[0022] 1) Using the turntable link mechanism that simulates cam transmission, the rotational motion is changed into the synchronous linear motion of multiple support blocks, improving the inner support accuracy;

[0023] 2) Changing the initial action point of the tightening force application, the turntable is driven by the cylinder to rotate, and the force drives the inner support block to tighten through the force transmission rod. Since the force application arm is much larger than the tightening force arm, only a very small force is required to achieve the same tightening force, and the mechanism is simplified and the weight is greatly reduced;

[0024] 3) The eccentric wheel is designed in the mechanism. On the one hand, it prevents the force transmission rod from passing through the dead center position; on the other hand, the eccentric wheel has an eccentric shaft structure design, and the tightening degree of the cylinder section can be adjusted by rotating the eccentric shaft.

[0025] 4) The structure is simple, the self-weight is reduced, the processing and assembly processability is good, and the manufacturing and maintenance costs are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It shows the structural schematic diagram of the inner support mechanism of the cylinder section;

[0027] Figure 2 Schematic structural diagram of the base body;

[0028] Figure 3 Schematic structural diagram of the turntable;

[0029] Figure 4 Cross-sectional view in the A-A direction;

[0030] In the figure,

[0031] 1. Base body; 2. Turntable; 3. Support block; 4. Spacer block; 5. Linear slide rail; 6. Cylinder; 7. Force-increasing connecting rod; 8. Eccentric wheel; 9. Positioning block; 10. Cylinder connecting shaft; 11. Stop block; 12. Bearing; 13. Bushing; 14. Expansion sleeve. Detailed implementation mode

[0032] To further understand the present invention, the implementation solutions of the present invention will be described below in conjunction with embodiments. However, it should be understood that these descriptions are only for further explaining the features and advantages of the present invention, rather than limiting the present invention.

[0033] The embodiment of the present invention discloses an inner support mechanism for a cylinder section, as Figure 1 shown, including:

[0034] Base body 1, with a central opening. An eccentric wheel 8 and a positioning block 9 are provided on the base body. Both the eccentric wheel 8 and the positioning block 9 protrude above the surface of the base body 1, with the same height and located on the same pitch circle; along the outer edge of the base body 1, a plurality of linear slide rails 5 are radially arranged from the central opening towards the edge;

[0035] Turntable 2, with a central opening, corresponding to the central opening of the base body 1, coaxially installed on the base body 1 and rotating around the base body 1; a plurality of lugs are evenly arranged on the turntable 2, and a stop block 11 is provided on the back of one of the lugs. The stop block 11 protrudes above the back of the lug. The stop block 11, the eccentric wheel 8 and the positioning block 9 are on the same pitch circle, and the stop block 11 is between the eccentric wheel 8 and the positioning block; the rotation angle of the turntable 2 is restricted by limiting the stop block 11 through the positioning block 9 and the eccentric wheel 8;

[0036] Cylinder 6, one end is connected to the base body 1 through a cylinder connecting shaft 10, and the other end is connected to the lug of the turntable 2;

[0037] Force-increasing connecting rod 7, one end is connected to the turntable 2, and the other end is connected to the support block 3;

[0038] The back of the support block 3 is connected to the linear slide rail 5;

[0039] One end of the support block 3 opposite to the force-increasing connecting rod 7 is connected with a spacer block 4.

[0040] The inner support mechanism of the cylinder section of the present invention will be described in detail according to specific components below.

[0041] As Figure 2 shown, the base body 1 has a central opening. An eccentric wheel 8 and a positioning block 9 are provided on the base body. Both the eccentric wheel 8 and the positioning block 9 protrude above the surface of the base body 1, with the same height and located on the same pitch circle. A number of linear slide rails 5 are radially arranged on the outer edge of the base body 1 from the central opening towards the edge.

[0042] Preferably, the angle between the eccentric wheel 8 and the positioning block 9 is 30°, and the pitch circle diameter is 800 mm to 1000 mm.

[0043] When the stop block 11 contacts the eccentric wheel 8, fine adjustment of the stop block is achieved through the rotation of the eccentric wheel, and then fine adjustment of the turntable is achieved.

[0044] Preferably, a number of relief holes are also provided around the central opening of the base body 1.

[0045] As Figure 3 shown, the turntable 2 has a central opening, corresponding to the central opening of the base body 1, and is coaxially installed on the base body 1 and rotates around the base body 1. A number of lugs are evenly arranged on the turntable 2. Preferably, 6 to 10 lugs are evenly arranged on the turntable, and each lug is connected to a cylinder 6.

[0046] A stop block 11 is provided on the back of one of the lugs. The stop block 11 protrudes above the back of the lug. The stop block 11, the eccentric wheel 8, and the positioning block 9 are on the same pitch circle, and the stop block 11 is between the eccentric wheel 8 and the positioning block. The stop block 11 is limited by the positioning block 9 and the eccentric wheel 8, thereby restricting the rotation angle of the turntable 2.

[0047] The turntable 2 is installed on the base body 1 through a bearing 12 and a bushing 13.

[0048] As Figure 4 shown, the inner surface of the bearing 12 is sleeved on the outer surface of the bushing 13, and the outer surface of the bearing 12 is sleeved on the inner surface of the center of the turntable 2.

[0049] The turntable 2 and the base body 1 are circular, and the diameter of the turntable 2 is smaller than the diameter of the base body 1.

[0050] A expansion sleeve 14 is also provided on the inner surface of the bushing 13 for close contact with the shaft. The base body 1 is installed and fastened through the expansion sleeve.

[0051] The cylinder 6 is connected to the base body 1 at one end through a cylinder connecting shaft 10 and to the lug of the turntable 2 at the other end.

[0052] The force - increasing connecting rod 7 is connected to the turntable 2 at one end and to the support block 3 at the other end.

[0053] Preferably, 12 to 16 force - increasing connecting rods are provided, and the force - increasing connecting rods are evenly distributed around the turntable.

[0054] The working principle of the inner support mechanism of the cylinder section: The base 1 is fixed to the equipment through the expansion sleeve 14. The telescopic movement of the air cylinder 6 drives the turntable 2 to rotate on the base 1 through the bearing 12 and the bushing 13. The rotation of the turntable 2 drives the swing of the force - increasing connecting rod 7. Driven by the force - increasing connecting rod 7 and the linear slide rail 5, the support block 3 is driven to perform telescopic movement, and then the spacer block 4 performs circumferential telescopic movement.

[0055] At this time, the cut - off block 11 moves between the eccentric wheel 8 and the positioning block 9.

[0056] When the air cylinder 6 extends and the cut - off block contacts the eccentric wheel 8, the extension limit is triggered. At this time, the spacer block 4 extends and is in the same circle, tightly attaching to the inner surface of the cylinder section for product processing. By finely adjusting the eccentric wheel, the extension amount of the spacer block 4 can be finely adjusted.

[0057] When the air cylinder 6 contracts and the cut - off block contacts the positioning block 9, the contraction limit is triggered. At this time, the spacer block 4 contracts and disengages from the inner surface of the cylinder section to realize product disassembly.

[0058] The inner support mechanism of the present invention has the following beneficial effects:

[0059] 1) Using the turntable - connecting rod mechanism that simulates cam drive, the rotational motion is changed into synchronous linear motion of multiple support blocks, improving the inner support accuracy;

[0060] 2) Changing the initial action point of the tightening force application. The air cylinder drives the turntable to rotate, and the force drives the inner support block to tighten through the force - transmitting rod. Since the force - applying force arm is much larger than the tightening force arm, only a very small force is required to achieve the same tightening force, and the mechanism is simplified and the weight is greatly reduced;

[0061] 3) The mechanism is designed with an eccentric wheel. On the one hand, it prevents the force - transmitting rod from passing through the dead - point position; on the other hand, the eccentric wheel has an eccentric - shaft structure design, and by rotating the eccentric shaft, the tightening degree of the cylinder section can be adjusted.

[0062] 4) The structure is simple, the self - weight is reduced, the processing and assembly technology is good, and the manufacturing and maintenance costs are low.

[0063] The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0064] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An inner support mechanism for a cylinder section, characterized in that Comprising: A base body with a central opening. An eccentric wheel and a positioning block are arranged on the base body. Both the eccentric wheel and the positioning block protrude above the surface of the base body, having the same height and being located on the same pitch circle. Along the outer edge of the base body, several linear slide rails are radially arranged from the central opening towards the edge. The turntable is installed on the base body through a bearing and a bushing; A turntable with a central opening, corresponding to the central opening of the base body, coaxially installed on the base body and rotating around the base body. A number of lugs are evenly arranged on the turntable. A cut-off block is arranged on the back of one of the lugs. The cut-off block protrudes above the back of the lug. The cut-off block, the eccentric wheel and the positioning block are on the same pitch circle, and the cut-off block is between the eccentric wheel and the positioning block. The rotation angle of the turntable is restricted by limiting the cut-off block through the positioning block and the eccentric wheel. When the cut-off block contacts the eccentric wheel, fine adjustment of the cut-off block is achieved through the rotation of the eccentric wheel, and thus fine adjustment of the turntable is realized; A cylinder, one end of which is connected to the base body through a cylinder connecting shaft, and the other end is connected to the lug of the turntable; A force-increasing connecting rod, one end of which is connected to the turntable and the other end is connected to a support block; The back of the support block is connected to the linear slide rail; A cushion block is connected to one end of the support block opposite to the force-increasing connecting rod; When the cylinder extends and the cut-off block contacts the eccentric wheel, the extension limit is triggered. At this time, the cushion block extends and is on the same circle, tightly adhering to the inner surface of the cylinder section for product processing. Fine adjustment of the extension amount of the cushion block is achieved by fine-tuning the eccentric wheel; When the cylinder contracts and the cut-off block contacts the positioning block, the contraction limit is triggered. At this time, the cushion block contracts and disengages from the inner surface of the cylinder section to realize product disassembly.

2. The inner support mechanism for the cylinder section according to claim 1, characterized in that, The inner surface of the bearing is sleeved on the outer surface of the bushing, and the outer surface of the bearing is sleeved on the inner surface of the center of the turntable.

3. The inner support mechanism for the cylinder section according to claim 1, characterized in that Both the turntable and the base body are circular, and the diameter of the turntable is smaller than that of the base body.

4. The inner support mechanism for the cylinder section according to claim 1, characterized in that, The angle between the eccentric wheel and the positioning block is 30°, and the pitch circle diameter is 800 mm to 1000 mm.

5. The inner support mechanism for the cylinder section according to claim 1, characterized in that, 6 to 10 lugs are evenly arranged on the turntable, and each lug is connected to a cylinder.

6. The inner support mechanism for the cylinder section according to claim 1, characterized in that, 12 to 16 force-increasing connecting rods are provided, and the force-increasing connecting rods are evenly distributed around the turntable.

7. The inner support mechanism for the cylinder section according to claim 1, characterized in that, A expansion sleeve is further arranged on the inner surface of the bushing for close contact with the shaft.

8. The inner support mechanism of the cylinder section according to claim 1, wherein A number of relief holes are also arranged around the central opening of the base body.

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