CN212947489U

CN212947489U - Turbojet engine flame tube air inlet hopper assembly fixture

Info

Publication number: CN212947489U
Application number: CN202021839375.4U
Authority: CN
Inventors: 魏林; 吴续婷; 李朝军
Original assignee: Sichuan Aerospace Zhongtian Power Equipment Co ltd
Current assignee: Sichuan Aerospace Zhongtian Power Equipment Co ltd
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2021-04-13
Anticipated expiration: 2030-08-28

Abstract

The utility model provides a turbojet engine flame tube hopper assembly jig that admits air belongs to aeroengine processing technology field. The clamp comprises an eccentric wheel, a movable pressure head, a spring, a rotary pressure head and a flat connecting rod, wherein the lower end of the flat connecting rod is rotatably connected with the eccentric wheel, the movable pressure head, the spring and the rotary pressure head are sequentially sleeved on the flat connecting rod, the lower surface of the movable pressure head is connected with one side of the eccentric wheel, a fixing piece is fixed at the upper end of the flat connecting rod, and the upper surface of the rotary pressure head is connected with the fixing piece. The utility model has the advantages of controllable clamping force and reliable clamping.

Description

Turbojet engine flame tube air inlet hopper assembly fixture

Technical Field

The utility model belongs to the technical field of the aeroengine processing, especially, relate to a turbojet engine flame tube hopper assembly jig that admits air.

Background

The flame tube is a main component of a combustion chamber on the turbojet engine and is a place for organizing combustion. The flame tube housing has an air inlet which functions to direct air to the flame tube head and to provide a secondary diffusion effect. The air inlet hopper is positioned on the air inlet and mainly used for controlling the air inlet direction, the air inlet flow speed and the air inlet amount.

30 air inlet hoppers are densely and uniformly distributed on a semi-closed flame tube shell with a deep U-shaped rotary section of a certain type developed by the company along the circumferential direction, and the air inlet hoppers are fixed on the flame tube shell in a brazing mode. Before brazing, the air inlet hoppers need to be assembled into the waist-shaped holes in the flame tube shell one by one and fixed through spot welding. In order to ensure the brazing quality, the assembly clearance between the air inlet hopper and the flame tube shell cannot be larger than 0.15 mm. In addition, in order to reduce thermal deformation, a symmetrical welding mode is required in the process. During the welding process, the flame tube needs to be turned over for many times.

In a narrow and dense space, 30 air inlet hoppers are all clamped, and the clamping is difficult to realize by adopting the conventional C-shaped clamp. Moreover, the C-shaped clamp head is a plane, is not attached to the profile of a workpiece, the clamping force is not easy to control, and the air inlet hopper and the flame tube shell are easy to deform due to too large clamping force; the C-shaped clamp is easy to fall off or loosen in the overturning process when the clamping force is too small. Therefore, a special clamp with controllable clamping force and reliable clamping is required to be designed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the assembling clamp for the turbojet engine flame tube air inlet hopper is controllable in clamping force and reliable in clamping.

In order to satisfy the above technical effects, the utility model adopts the following technical scheme:

the utility model provides a turbojet engine flame tube hopper assembly jig that admits air, includes eccentric wheel, removal pressure head, spring, rotation pressure head and flat connecting rod, and the lower extreme and the eccentric wheel of flat connecting rod rotate to be connected, and removal pressure head, spring and rotation pressure head overlap in proper order and establish on the flat connecting rod to the lower surface of removal pressure head contacts with the circumference outside of eccentric wheel, and the upper end of flat connecting rod is fixed with a mounting, rotates the upper surface and the mounting contact of pressure head.

The eccentric wheel is further provided with a butt-beating rivet, a first through hole is formed in the position, away from the center 1/14-1/20 of the wheel diameter, of the eccentric wheel, a groove is formed in the side face of one side of the eccentric wheel, a flat square is arranged at the lower end of the flat connecting rod, a second through hole is formed in the flat square, the flat square at the lower end of the flat connecting rod is inserted into the groove, the butt-beating rivet penetrates through the first through hole and the second through hole to connect the eccentric wheel and the flat connecting rod, and the rotating point of the eccentric wheel is coaxial with the middle.

Furthermore, a first gasket is further sleeved on the flat connecting rod and is positioned between the lower surface of the movable pressure head and one side of the eccentric wheel.

Furthermore, a second gasket is sleeved on the flat connecting rod and is positioned between the upper surface of the movable pressing head and the lower end of the spring.

Furthermore, the movable pressure head is of a C-shaped structure, and a flat round hole matched with the shape and size of the flat connecting rod body is further formed in the middle of the movable pressure head.

Furthermore, a round hole is formed in the middle of the rotary pressure head, and the aperture of the round hole is slightly larger than the diameter of the flat connecting rod.

Furthermore, the lower surface of the rotary pressure head is a cambered surface, and the radius of the cambered surface is equal to that of the surface of the air inlet hopper.

Further, the first gasket is shaped as concentric rings and is made of nylon.

Furthermore, a handle is arranged on one side of the eccentric wheel, which is opposite to the flat connecting rod.

Furthermore, the upper end of the flat connecting rod is provided with threads, the fixing piece is a nut, and the nut is in threaded connection with the upper end of the flat connecting rod.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

the utility model provides a turbojet engine flame tube hopper assembly jig that admits air uses this anchor clamps can fix 30 hopper rapid Assembly on the flame tube shell, improves flame tube hopper assembly efficiency that admits air by a wide margin. The clamp has the advantages of convenient operation, light structure, durability, reliable clamping and the like.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a partial cross-sectional view of the present invention;

FIG. 3 is a schematic view of an eccentric wheel structure;

FIG. 4 is a schematic view of a moving ram configuration;

FIG. 5 is a schematic view of a rotary ram configuration;

FIG. 6 is a schematic view of a flat screw configuration;

FIG. 7 is a schematic structural diagram of an embodiment;

in the drawings: 1-eccentric wheel, 2-knocking rivet, 3-first gasket, 4-moving pressure head, 5-second gasket, 6-spring, 7-rotating pressure head, 8-fixing piece, 9-connecting rod, 10-flame tube shell, 11-air inlet hopper and 12-flame tube air inlet hopper assembling clamp.

Detailed Description

The features and properties of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

As shown in fig. 1, the utility model relates to a turbojet engine flame tube hopper assembly jig, in a specific embodiment:

including eccentric wheel 1, removal pressure head 4, spring 6, rotation pressure head 7 and flat connecting rod 9, the lower extreme of flat connecting rod 9 rotates with eccentric wheel 1 to be connected, removes pressure head 4, spring 6 and rotates pressure head 7 and overlaps in proper order and establish on flat connecting rod 9 to the lower surface of removing pressure head 4 contacts with the circumference outside of eccentric wheel 1, and the upper end of flat connecting rod 9 is fixed with a mounting 8, rotates the upper surface and the mounting 8 contact of pressure head 7.

In this embodiment, 8 restrictions of mounting rotate the pressure head 7 and move to flat connecting rod 9 upper end, and spring 6 can restrict to rotate pressure head 7 and move to flat connecting rod 9 lower extreme, so only need adjust the position that removes pressure head 4, can adjust the distance that removes between pressure head 4 and the rotation pressure head 7, and then reach the purpose of adjusting the anchor clamps elasticity degree. The length of spring 6 should be able to satisfy when removing pressure head 4 and rotating pressure head 7 distance when furthest, still keeps compression state, just so can guarantee in each state of anchor clamps, spring 6 can both play the squeezing action to removing pressure head 4 and rotating pressure head 7, makes the position that rotates pressure head 7 not change, removes pressure head 4 and can in time reset.

Because the lower surface of the moving pressure head 4 is connected with one side of the eccentric wheel 1, and because the eccentric wheel 1 is rotatably connected with the lower end of the flat connecting rod 9, and the rotating point of the eccentric wheel 1 is not coincident with the midpoint thereof, when the eccentric wheel 1 rotates, the distance between the lower surface of the moving pressure head 4 and the midpoint of the eccentric wheel 1 changes, so that the moving pressure head 4 axially moves on the flat connecting rod 1. When the eccentric wheel 1 is rotated to enable the distance between the lower surface of the movable pressure head 4 and the midpoint of the eccentric wheel 1 to be shortest, the movable pressure head 4 is farthest away from the rotary pressure head 7 at the moment, and the clamp is in a loosening state; when the distance between the lower surface of the movable pressure head 4 and the middle point of the eccentric wheel 1 is farthest, the movable pressure head 4 is closest to the rotating pressure head 7 at the moment, and the clamp is in a clamping state.

Besides, in another embodiment of the present invention, as shown in fig. 2, fig. 3 and fig. 5, the present invention further includes a butt-knocking rivet 2, a first through hole is opened at a distance from the center 1/14-1/20 of the eccentric wheel 1 to the eccentric wheel 1, a groove is opened at a side of one side of the eccentric wheel 1, a flat square is provided at the lower end of the flat connecting rod 9, a second through hole is opened on the flat square, the flat square at the lower end of the flat connecting rod 9 is inserted into the groove, the butt-knocking rivet 2 penetrates through the first through hole and the second through hole to connect the eccentric wheel 1 and the flat connecting rod 9, and a rotation point of the eccentric wheel 1 is coaxial with a.

The embodiment provides a preferable rotation connection mode, a first through hole is formed in the eccentric wheel 1, the position of the first through hole is at the wheel diameter position from 1/14-1/20 of the center of the eccentric wheel 1, the setting is that the position of the center of the first through hole is the position of the rotation point of the eccentric wheel 1, the ratio of the wheel diameter of the eccentric wheel 1 to the eccentricity is designed to be 14-20, and the eccentric wheel 1 can realize self-locking at any position. On the premise of ensuring the self-locking condition, the eccentric distance needs to be designed reasonably, and the eccentric distance is too small to meet the clamping stroke; the too big eccentric distance can cause eccentric wheel 1 diameter too big, and the space is not enough when causing anchor clamps to use, so the utility model discloses the eccentric distance design is 2 mm. The side surface of the eccentric wheel 1 is provided with a groove, the width of the groove is slightly larger than the flat side of the flat connecting rod, and the groove of the eccentric wheel 1 is matched with the flat side of the flat connecting rod 9 to limit the rotation direction of the eccentric wheel 1.

In another embodiment of the present invention, as shown in fig. 1, the flat connecting rod 9 is further sleeved with a first gasket 3, and the first gasket 3 is located between the lower surface of the moving ram and one side of the eccentric wheel 1. The flat connecting rod 9 is also sleeved with a second gasket 5, and the second gasket 5 is positioned between the upper surface of the movable pressure head 4 and the lower end of the spring 6. The first gasket 3 is shaped as concentric rings and is made of nylon. The nylon material is far lower than the hardness of the eccentric wheel 1 and the movable pressure head 4, the function of the nylon material is to avoid hard contact between the eccentric wheel 1 and the movable pressure head 4, and meanwhile, the friction force can be increased to prevent the eccentric wheel 1 from loosening. When the rotary pressure head 7 rotates, one end of the spring 6 is driven to twist under the action of friction force, and a twisting force is generated. The effect of second packing ring 5 is that drive spring 6 other end follows the rotation, unloads the torsional force, makes and rotates pressure head 7 and can not kick-back under the torsional force effect and cause the dislocation to ensure to rotate pressure head 7 and can compress tightly the position profile that needs to press from both sides tightly and laminate with 11 profiles of air inlet hopper.

In another embodiment of the present invention, as shown in fig. 3, 4 and 6, the movable pressing head 4 is a C-shaped structure, and a flat circular hole matched with the shape and size of the shaft of the flat connecting rod 9 is further formed in the middle of the movable pressing head 4. The middle part of the rotary pressure head 7 is provided with a round hole, and the aperture of the round hole is slightly larger than the diameter of the flat connecting rod 9. The lower surface of the rotary pressure head 7 is a cambered surface, and the radius of the cambered surface is equal to that of the surface of the air inlet hopper 11. A handle is arranged on one side of the eccentric wheel 1. The flat round hole is used for limiting the freedom degree of the movable pressure head 4, so that the movable pressure head can only axially move along the flat connecting rod 9 and can not radially rotate, and the C-shaped opening of the movable pressure head 4 is kept perpendicular to the rotating direction of the eccentric wheel 1, so that the eccentric wheel handle moves in the vertical direction when a part is pressed, and mutual interference among a plurality of clamps is avoided. And the round hole can ensure that the rotating pressure head 7 can not only axially move along the flat connecting rod 9, but also radially rotate. The radius of the cambered surface is equal to that of the surface of the air inlet hopper 11, so that the rotary pressure head 7 can be tightly attached to the surface of the flame tube shell 10 when the clamp is clamped.

In another embodiment of the present invention, the upper end of the flat connecting rod 9 is provided with a screw thread, and the fixing member 8 is a nut, and the nut is connected to the upper end of the flat connecting rod 9 by a screw thread. The nut is in threaded fit with the upper end of the flat connecting rod 9 and is used for adjusting the compression stroke of the clamp. The nut is screwed inwards to reduce the clamping stroke, and is unscrewed outwards to increase the pressing stroke. The longer the stroke is, the greater the distance between the pressure head and the workpiece is, and the greater the rotation angle required by the eccentric wheel 1 for pressing. The shorter the stroke is, the smaller the distance between the pressure head and the workpiece is, and the smaller the rotation angle required by the eccentric wheel 1 for pressing is. The adjusting stroke cannot be larger than the pressing stroke of the eccentric wheel 1, otherwise, the eccentric wheel cannot be pressed. The utility model discloses the eccentric wheel stroke design is 4mm for 2 times of eccentricity, compresses tightly the stroke and gets half 2mm comparatively suitable. After stroke adjustment is completed, the nut and the flat connecting rod 9 are fixed in a spot welding mode, and clamping reliability is improved.

Referring to fig. 7, in specific application, the using method and steps of the present invention are as follows:

1. the air inlet hopper 11 is arranged in the kidney-shaped hole of the flame tube shell 10.

2. The rotary ram 7 is rotated to be perpendicular to the moving ram 4.

3. After the rotary pressure head 7 passes through the waist-shaped hole of the air inlet hopper 11, the rotary pressure head 7 is rotated to be parallel to the movable pressure head 4, and the nut 8 is adjusted to ensure that the distance between the cambered surface of the rotary pressure head 7 and the molded surface of the air inlet hopper 11 is about 2 mm.

4. The eccentric wheel 1 is rotated, so that the movable pressure head 4 is pressed against the inner wall of the flame tube shell 10, and the rotary pressure head 7 is pressed against the outer molded surface of the air inlet hopper 11.

5. And (5) repeating the steps 1-4, and assembling the rest air inlet hoppers 11.

6. And fixing the air inlet hopper 11 and the flame tube shell by spot welding, and fixing the nut 8 and the flat connecting rod 9 by spot welding. And (3) carrying out spot welding on the air inlet hoppers 11 at each point, rotating the flame tube by 180 degrees, and then carrying out symmetrical spot welding to reduce welding thermal deformation.

7. After all the air inlet hoppers 11 are subjected to spot welding, the handle of the eccentric wheel 1 is broken off one by one to loosen the movable pressure head 4, the rotary pressure head 7 is rotated by 90 degrees and taken out of the air inlet hoppers 11, and the clamp is disassembled.

Claims

1. The utility model provides a turbojet engine flame tube hopper assembly jig that admits air which characterized in that: including eccentric wheel (1), removal pressure head (4), spring (6), rotation pressure head (7) and flat connecting rod (9), the lower extreme of flat connecting rod (9) with eccentric wheel (1) rotates and connects, remove pressure head (4), spring (6) and rotate pressure head (7) and overlap in proper order and establish on flat connecting rod (9), and the lower surface of removing pressure head (4) with the circumference outside contact of eccentric wheel (1), the upper end of flat connecting rod (9) is fixed with a mounting (8), the upper surface of rotating pressure head (7) with mounting (8) contact.

2. The turbojet engine flame tube bucket assembly jig of claim 1 wherein: the anti-theft device is characterized by further comprising a butt-knocking rivet (2), a first through hole is formed in the position, away from the center 1/14-1/20 of the eccentric wheel (1), a groove is formed in the side face of one side of the eccentric wheel (1), a flat square is arranged at the lower end of the flat connecting rod (9), a second through hole is formed in the flat square, the flat square at the lower end of the flat connecting rod (9) is inserted into the groove, the butt-knocking rivet (2) penetrates through the first through hole and the second through hole to connect the eccentric wheel (1) and the flat connecting rod (9), and the rotating point of the eccentric wheel (1) is coaxial with the middle point of the.

3. The turbojet engine flame tube bucket assembly jig of claim 1 wherein: still overlap on flat connecting rod (9) and be equipped with first packing ring (3), first packing ring (3) are located the centre of removing pressure head (4) lower surface and eccentric wheel (1) one side.

4. The turbojet engine flame tube inlet hopper assembly fixture of claim 1 or claim 3, wherein: still overlap on flat connecting rod (9) and be equipped with second packing ring (5), second packing ring (5) are located and move the middle of pressure head (4) upper surface and spring (6) lower extreme.

5. The turbojet engine flame tube bucket assembly jig of claim 1 wherein: the movable pressure head (4) is of a C-shaped structure, and a flat round hole matched with the shape and size of the rod body of the flat connecting rod (9) is formed in the middle of the movable pressure head (4).

6. The turbojet engine flame tube bucket assembly jig of claim 1 wherein: a round hole is formed in the middle of the rotary pressure head (7), and the aperture of the round hole is slightly larger than the diameter of the flat connecting rod (9).

7. The turbojet engine flame tube inlet hopper assembly fixture of claim 1 or 6, wherein: the lower surface of the rotary pressure head (7) is a cambered surface, and the radius of the cambered surface is equal to that of the surface of the air inlet hopper.

8. The turbojet engine flame tube bucket assembly jig of claim 3 wherein: the first gasket (3) is in the shape of concentric rings and is made of nylon.

9. The turbojet engine flame tube inlet hopper assembly fixture of claim 1 or claim 2, wherein: a handle is arranged on one side of the eccentric wheel (1) opposite to the flat connecting rod (9).

10. The turbojet engine flame tube bucket assembly jig of claim 1 wherein: the upper end of the flat connecting rod (9) is provided with threads, the fixing piece (8) is a nut, and the nut is in threaded connection with the upper end of the flat connecting rod (9).