Large-torque flange structure connected by expansion pin

Abstract

The utility model provides a large-torque flange structure connected by expansion pins, which comprises a power output flange and an input flange, a plurality of groups of first through holes which are in one-to-one correspondence and have the same aperture are arranged on the two flanges, and a flexible expansion pin is arranged in each group of first through holes; the flexible expansion pin comprises a flexible expansion pin sleeve, a first flexible inner expansion sleeve, a second flexible inner expansion sleeve and a first stress application bolt; the flexible expansion pin sleeve is in clearance fit with the first through holes in the two flanges, the two ends of the flexible expansion pin sleeve are each provided with a taper hole, and a through hole is formed between the two taper holes. The first flexible inner expansion sleeve is arranged in one taper hole, and the second flexible inner expansion sleeve is arranged in the other taper hole; a threaded hole is formed in the axis of the first flexible inner expansion sleeve, and a through hole is formed in the axis of the second flexible inner expansion sleeve. The first stress application bolt penetrates through the axis through hole of the second flexible inner expansion sleeve and the through hole between the two taper holes of the flexible expansion pin sleeve to be matched with the axis threaded hole of the first flexible inner expansion sleeve. The device is convenient to assemble and disassemble, has low requirements on the machining precision and the position degree of holes in the flange, and has no limitation on the sizes of the holes.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical connection structure technical field especially a big torque flange structure connected by expansion pin. BACKGROUND

[0002] With the development of science and technology and the update of technology, the wind power generation industry has experienced several updates and developments. As the main force of the new energy industry, with the product upgrading iteration and technology progress of the whole industry continuously promoting the improvement of core competitiveness, the operating efficiency and the intelligent level are greatly improved, the average cost of wind power projects is greatly reduced, and the important way to reduce the degree of wind power project cost is the large-scale of wind turbine and the continuous improvement of the generating performance, availability and reliability of the unit. The large-scale and intelligentization of wind turbine is the main direction of technological progress and innovation. Due to the development of wind power in the direction of high quality, high power and low cost, each part is optimized in design, cost saving and lightweight, which not only ensures the reliability of the connection, but also realizes the low-cost goal. Among them, the connection between the main shaft of the wind turbine and the speed increasing box is realized by the connection between the power output flange on the main shaft of the wind turbine and the power input flange of the speed increasing box. A pair of through holes with the same hole diameter are arranged on the power output flange and the power input flange, and an expansion pin is arranged in the pair of through holes to transmit torque. When the shaft diameter is very large and the torque transmission is very large, the traditional expansion pin adopts elastic cylindrical pin with expansion force and outer diameter larger than hole diameter. Because the outer diameter of the elastic cylindrical pin is larger than the hole diameter, it is difficult to install and disassemble, so the maximum outer diameter of the traditional expansion pin can only be 50mm, which makes the carrying capacity of a single expansion pin low, which requires a large number of group holes on the two flanges, so the machining precision and position of the holes are high, and the manufacturing cost is also high. SUMMARY

[0003] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is to provide a big torque flange structure connected by expansion pin, which is convenient to install and disassemble, has low requirements for the machining precision and position of the holes on the flange, and has no size limitation for the holes on the flange, so as to overcome the above-mentioned defects of the prior art.

[0004] In order to solve the above technical problems, the utility model provides a big torque flange structure connected by expansion pin, which comprises a power output flange and a power input flange, a plurality of groups of first through holes with the same hole diameter are arranged on the power output flange and the power input flange in one-to-one correspondence, and a flexible expansion pin is arranged in each group of first through holes.

[0005] The flexible expansion pin comprises a flexible expansion pin sleeve, a first flexible inner expansion sleeve, a second flexible inner expansion sleeve, and a first force bolt; the outer diameter of the flexible expansion pin sleeve is clearance fitted with the hole diameter of the first through hole on the power output flange and the power input flange, both ends of the flexible expansion pin sleeve are respectively provided with a taper hole with a large outer hole diameter and a small inner hole diameter, and the inside of the flexible expansion pin sleeve is provided with a through hole penetrating the taper holes at both ends; the first flexible inner expansion sleeve is arranged in the taper hole at one end of the flexible expansion pin sleeve, the outer wall of the first flexible inner expansion sleeve is clearance fitted with the inner wall of the taper hole at one end of the flexible expansion pin sleeve, and the axis of the first flexible inner expansion sleeve is provided with a first threaded hole; the second flexible inner expansion sleeve is arranged in the taper hole at the other end of the flexible expansion pin sleeve, the outer wall of the second flexible inner expansion sleeve is clearance fitted with the inner wall of the taper hole at the other end of the flexible expansion pin sleeve, and the axis of the second flexible inner expansion sleeve is provided with a through hole; the first force bolt is clearance fitted with the through hole in the axis of the second flexible inner expansion sleeve, the through hole in the inside of the flexible expansion pin sleeve, and the first threaded hole in the axis of the first flexible inner expansion sleeve.

[0006] Optionally, a plurality of groups of one-to-one corresponding and same hole diameter light holes are further arranged on the power output flange and the power input flange, wherein the light hole on one flange is a through hole, and the light hole on the other flange is a blind hole; a rigid expansion pin is arranged in each group of light holes on the power output flange and the power input flange;

[0007] The rigid expansion pin comprises a rigid expansion pin sleeve, a tapered expansion pin core, and a second force bolt; the outer diameter of the rigid expansion pin sleeve is clearance fitted with the hole diameter of the light hole on the power output flange and the power input flange, one end of the rigid expansion pin sleeve adjacent to the blind hole is provided with a taper hole with a large outer hole diameter and a small inner hole diameter, and the other end of the rigid expansion pin sleeve is provided with a second threaded hole penetrating the taper hole;

[0008] The tapered expansion pin core is arranged in the taper hole of the rigid expansion pin sleeve, the outer wall of the tapered expansion pin core is clearance fitted with the inner wall of the taper hole of the rigid expansion pin sleeve, and the axis of the end with a smaller outer diameter of the tapered expansion pin core is provided with a third threaded hole, and the end surface of the bottom hole of the third threaded hole is a plane;

[0009] The second force bolt is clearance fitted with the second threaded hole of the rigid expansion pin sleeve and the third threaded hole of the tapered expansion pin core.

[0010] Preferably, at least one axial incision is arranged on the circumferential wall of the taper hole of the rigid expansion pin sleeve.

[0011] Preferably, the outer edge of the end of the rigid expansion pin sleeve away from the blind hole is provided with a first boss.

[0012] Preferably, a light hole or a fourth threaded hole is arranged on the side wall of the first boss of the rigid expansion pin sleeve.

[0013] Preferably, the outer side of the rigid expansion pin sleeve is provided with a first groove at the joint surface of the power output flange and the power input flange.

[0014] Preferably, the outer edge of the end of the flexible expansion pin sleeve matched with the first flexible inner expansion sleeve is provided with a second boss; the end with a larger outer diameter of the second flexible inner expansion sleeve is provided with a thread, and the thread is provided with a nut, and the nut and the second boss of the flexible expansion pin sleeve sandwich the power output flange and the power input flange.

[0015] Preferably, the side wall of the second boss of the flexible expansion pin sleeve is provided with a light hole or a fifth threaded hole.

[0016] Optionally, the through hole of the axis of the second flexible inner expansion sleeve includes a sixth threaded hole, and the through hole in the interior of the flexible expansion pin sleeve includes a seventh threaded hole, and the sixth threaded hole of the axis of the second flexible inner expansion sleeve is larger than the seventh threaded hole in the interior of the flexible expansion pin sleeve.

[0017] Preferably, the outer side of the flexible expansion pin sleeve is provided with a second groove at the joint surface of the power output flange and the power input flange.

[0018] As described above, the large-torque flange structure connected by expansion pins has the following beneficial effects:

[0019] When preassembled, the expansion pin has a clearance fit with the holes on the power output flange and the power input flange, so that the installation is convenient; when disassembled, the expansion pin sleeve and the internal components are first separated by using a tool to disassemble the bolts, so that the extrusion force between the expansion pin and the holes on the two flanges is first unloaded, and then the expansion pin is disassembled, so that the disassembly is convenient; the machining precision and the position degree of the holes on the flanges are low, the production cost is reduced, and the size of the holes on the flanges is not limited, so that the diameter of the holes on the flanges can be as large as 100 mm or even larger. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0021] Figure 1 is a cross-sectional view of the preassembly of the present application;

[0022] Figure 2 is a cross-sectional view of the disassembly of the present application Figure 1 ;

[0023] Figure 3 is the cross-sectional view when the utility model is disassembled Figure 2 ;

[0024] Figure 4 is the cross-sectional view when the utility model is disassembled Figure 3 ;

[0025] Figure 5 is the overall arrangement schematic diagram of the utility model.

[0026] Element number explanation:

[0027] 100, power output flange;200, power input flange;300, flexible expansion pin;310, flexible expansion pin sleeve;311, seventh threaded hole;312, second boss;313, light hole or fifth threaded hole;314, second recess;320, first flexible inner expansion sleeve;321, first threaded hole;330, second flexible inner expansion sleeve;331, sixth threaded hole;332, screw;340, first force bolt;350, nut;400, rigid expansion pin;410, rigid expansion pin sleeve;411, second threaded hole;412, notch;413, first boss;414, light hole or fourth threaded hole;415, first recess;420, tapered expansion pin core;421, third threaded hole;430, second force bolt;510, disassembly bolt one;520, disassembly bolt two;530, disassembly bolt three;540, tool gasket;550, disassembly bolt four;600, bolt pair. DETAILED DESCRIPTION

[0028] The following specific embodiments illustrate the implementation of the utility model, and those skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification.

[0029] Please refer to Figures 1 to 5 . It should be understood that the structure, proportion, size, etc. shown in the drawings attached to the specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the implementation conditions of the utility model, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that the utility model can produce, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" in the specification are only for the convenience of clear description, and are not used to limit the scope of the utility model, the change or adjustment of relative relationship, without substantial change of technical content, is also regarded as the scope of the utility model.

[0030] Hereinafter, the large-torque flange structure connected by expansion pins will be described in detail through specific embodiments.

[0031] As shown in Figure 1 , Figure 5 , a large-torque flange structure connected by expansion pins comprises a power output flange 100 and a power input flange 200, wherein the power output flange 100 and the power input flange 200 are provided with a plurality of groups of first through holes corresponding to each other and having the same hole diameter, and each group of first through holes is provided with a flexible expansion pin 300.

[0032] As shown in Figure 1 , the flexible expansion pin 300 comprises a flexible expansion pin sleeve 310, a first flexible inner expansion sleeve 320, a second flexible inner expansion sleeve 330, and a first force bolt 340. The outer diameter of the flexible expansion pin sleeve 310 is in clearance fit with the hole diameter of the first through hole on the power output flange 100 and the power input flange 200. The two ends of the flexible expansion pin sleeve 310 are respectively provided with a tapered hole with a large outer diameter and a small inner diameter, and the inside of the flexible expansion pin sleeve 310 is provided with a through hole penetrating the tapered holes at both ends. The first flexible inner expansion sleeve 320 is arranged in the tapered hole at one end of the flexible expansion pin sleeve 310, and the outer wall of the first flexible inner expansion sleeve 320 is in taper surface fit with the inner wall of the tapered hole at one end of the flexible expansion pin sleeve 310. The second flexible inner expansion sleeve 330 is arranged in the tapered hole at the other end of the flexible expansion pin sleeve 310, and the outer wall of the second flexible inner expansion sleeve 330 is in taper surface fit with the inner wall of the tapered hole at the other end of the flexible expansion pin sleeve 310. The axis of the first flexible inner expansion sleeve 320 is provided with a first threaded hole 321, and the axis of the second flexible inner expansion sleeve 330 is provided with a through hole; the first force bolt 340 penetrates the through hole in the axis of the second flexible inner expansion sleeve 330, the through hole in the inside of the flexible expansion pin sleeve 310, and the first threaded hole 321 in the axis of the first flexible inner expansion sleeve 320.

[0033] As shown in Figure 1 , the outer edge of the end of the flexible expansion pin sleeve 310 matched with the first flexible inner expansion sleeve 320 is provided with a second boss 312; the end with a larger outer diameter of the second flexible inner expansion sleeve 330 is provided with a threaded portion 332, and a nut 350 is arranged on the threaded portion 332; the nut 350 and the second boss 312 of the flexible expansion pin sleeve sandwich the power output flange 100 and the power input flange 200. A light hole or a fifth threaded hole 313 is arranged on the side wall of the second boss 312 of the flexible expansion pin sleeve.

[0034] As shown in Figure 1As shown, the through hole of the axial center of the second flexible inner expansion sleeve 330 includes a sixth threaded hole 331, and the through hole inside the flexible expansion sleeve 310 includes a seventh threaded hole 311. The sixth threaded hole 331 of the axial center of the second flexible inner expansion sleeve 330 is larger than the seventh threaded hole 311 inside the flexible expansion sleeve 310.

[0035] As shown in the drawings, Figure 1 As shown, the outer side of the flexible expansion sleeve 310 is provided with a second groove 314 at the joint surface of the power output flange 100 and the power input flange 200.

[0036] As shown in the drawings, Figure 1 , Figure 5 As shown, a plurality of groups of one-to-one corresponding and same aperture light holes are arranged on the power output flange 100 and the power input flange 200. The light hole on one flange is a through hole, and the light hole on the other flange is a blind hole. A rigid expansion pin 400 is arranged in each group of light holes on the power output flange 100 and the power input flange 200.

[0037] As shown in the drawings, Figure 1 As shown, the rigid expansion pin 400 includes a rigid expansion sleeve 410, a tapered expansion pin core 420, and a second force bolt 430. The outer diameter of the rigid expansion sleeve 410 is gap-fitted with the aperture of the light hole on the power output flange 100 and the power input flange 200. One end of the rigid expansion sleeve 410 adjacent to the blind hole is provided with a tapered hole with a large outer aperture and a small inner aperture. The other end of the rigid expansion sleeve 410 is provided with a second threaded hole 411 penetrating the tapered hole. The tapered expansion pin core 420 is arranged in the tapered hole of the rigid expansion sleeve 410, and the outer wall of the tapered expansion pin core 420 is taper-fitted with the inner wall of the tapered hole of the rigid expansion sleeve 410. The axial center of the end of the tapered expansion pin core 420 with a smaller outer diameter is provided with a third threaded hole 421, and the end face of the bottom hole of the third threaded hole 421 is a flat surface. The second force bolt 430 is fitted through the second threaded hole 411 of the rigid expansion sleeve and the third threaded hole 421 of the tapered expansion pin core.

[0038] As shown in the drawings, Figure 1 As shown, at least one axial incision 412 is arranged on the circumferential side wall of the tapered hole of the rigid expansion sleeve 410.

[0039] As shown in the drawings, Figure 1 As shown, the outer edge of the end of the rigid expansion sleeve 410 away from the blind hole is provided with a first boss 413. A light hole or a fourth threaded hole 414 is arranged on the side wall of the first boss 413 of the rigid expansion sleeve.

[0040] As shown in the drawings, Figure 1As shown, the outer side of the rigid expansion pin sleeve 410 has a first groove 415 at the mating surface of the power output flange 100 and the power input flange 200. This first groove 415 provides stress relief space for the positional difference of the holes on the power output flange 100 and the power input flange 200.

[0041] The installation method of this utility model is as follows:

[0042] Installation of Flexible Expansion Pin 300:

[0043] like Figure 1 As shown, the first flexible inner expansion sleeve 320 is inserted into the tapered hole at one end of the flexible expansion pin sleeve 310, and the second flexible inner expansion sleeve 330 is inserted into the tapered hole at the other end of the flexible expansion pin sleeve 310. The first tensioning bolt 340 is then passed through the through hole in the center of the second flexible inner expansion sleeve 330, the through hole inside the flexible expansion pin sleeve 310, and the first threaded hole 321 in the center of the first flexible inner expansion sleeve 320 to complete the pre-assembly.

[0044] The pre-installed flexible expansion pin 300 is inserted into a set of first through holes on the power output flange 100 and the power input flange 200. Because the outer diameter of the flexible expansion pin sleeve 310 is clearance-fitted with the diameter of the first through holes on the power output flange 100 and the power input flange 200, the pre-installed flexible expansion pin 300 can be easily inserted into a set of first through holes on the two flanges.

[0045] The second boss 312 of the flexible expansion sleeve 310 is brought into close contact with the outer end face of a flange, and then the first tension bolt 340 is tightened, causing the first flexible inner expansion sleeve 320 and the second flexible inner expansion sleeve 330 to move into their respective conical holes, as shown. Figure 2 As shown, through the compression between the conical surfaces, the outer surface of the flexible expansion pin sleeve 310 expands outward, forming an interference fit with the first through hole on the power output flange 100 and the power input flange 200. The force situation between the flexible expansion pin 300 and the power output flange 100 and the power input flange 200 is as follows. Figure 2 As shown in F1, the flexible expansion pin 300 forms a reliable connection with the power output flange 100 and the power input flange 200. It should be noted that the first tightening bolt 340 can be tightened with different torques depending on the materials of the power output flange 100 and the power input flange 200, resulting in different compressive forces to suit the connection of flanges made of materials with different strengths.

[0046] Finally, as Figure 2As shown, the nut 350 is tightened onto the thread 332 of the second flexible inner expansion sleeve 330, so that the nut 350 and the second boss 312 of the flexible expansion pin sleeve tightly clamp the power output flange 100 and the power input flange 200 in the middle. With this connection structure, the flexible expansion pin 300 can effectively bear and transmit both the circumferential shear force and the axial force between the two flanges.

[0047] like Figure 1 As shown, the two ends of the flexible expansion sleeve 310 are rigidly connected to the first flexible inner expansion sleeve 320 and the second flexible inner expansion sleeve 330 at their mating points; the outer side of the middle region of the flexible expansion sleeve 310 has a second groove 314 with a through hole inside, and there is a gap between the through hole and the first force-applying bolt 340, which is the flexible connection point of the flexible expansion pin 300, providing stress relief space for the positional difference of the holes on the power output flange 100 and the power input flange 200.

[0048] Installation of rigid expansion pin 400:

[0049] like Figure 1 As shown, the tapered expansion pin core 420 is inserted into the tapered hole of the rigid expansion pin sleeve 410, and the second force-applying bolt 430 is passed through the second threaded hole 411 of the rigid expansion pin sleeve and engaged with the third threaded hole 421 of the tapered expansion pin core to complete the pre-installation.

[0050] The pre-installed rigid expansion pin 400 is inserted into a set of holes in the power output flange 100 and the power input flange 200. Because the outer diameter of the rigid expansion pin sleeve 410 is clearance-fitted with the aperture of the holes on the power output flange 100 and the power input flange 200, the pre-installed rigid expansion pin 400 can be easily inserted into these holes of the two flanges. The first boss 413 of the rigid expansion pin sleeve 410 is pressed tightly against the outer end face of the adjacent flange. A disassembly bolt is inserted into the open hole or fourth threaded hole 414 of the rigid expansion pin sleeve 410. Then, holding the disassembly bolt with one hand and tightening the second tightening bolt 430 with the other, the tapered expansion pin core 420 moves into the tapered hole of the rigid expansion pin sleeve 410. Through the compression between the tapered surfaces, the outer surface of the rigid expansion pin sleeve 410 expands outward, forming an interference fit with the corresponding open holes on the power output flange 100 and the power input flange 200. The force situation between the rigid expansion pin 400 and the power output flange 100 and the power input flange 200 is as follows. Figure 2F2, the rigid expansion pin 400 forms a reliable connection with the power output flange 100 and the power input flange 200. It is explained here that the second force bolt 430 is tightened, and different torque is given to the second force bolt 430 according to the different materials of the power output flange 100 and the power input flange 200, so that different extrusion forces are obtained to adapt to the connection of flanges of different strength materials. Such a connection structure, the rigid expansion pin 400 can well bear and transmit the circumferential shear force between the two flanges.

[0051] As shown in Figs. 1-2, Figure 3 , Figure 4 , Figure 5 In order to make the bearing and transmission of axial force between the two flanges more safe and reliable, a plurality of second through holes corresponding to each other can also be arranged on the power output flange 100 and the power input flange 200, and a bolt pair 600 is arranged in each second through hole. The two flanges are further clamped in the axial direction through the tightening of the bolt pair 600.

[0052] The disassembly method of the utility model is as follows:

[0053] The disassembly method of the flexible expansion pin 300 is as follows:

[0054] First, the first force bolt 340 is removed; then, as shown in Figs. 1-2, Figure 2 , the nut 350 is tightened, because the nut 350 abuts against the flange end face and cannot move inward, thereby driving the second flexible inner expansion sleeve 330 to move outward and disengage from the flexible expansion pin sleeve 310, and the second flexible inner expansion sleeve 330 is removed together with the nut 350.

[0055] As shown in Figs. 1-2, Figure 2 , the tool gasket 540 is pressed on the outer end face of the second boss 312 of the flexible expansion pin sleeve 310, and the disassembly bolt three 530 is screwed into the first threaded hole 321 of the first flexible inner expansion sleeve 320, so that the head of the disassembly bolt three 530 abuts against the tool gasket 540; then the disassembly bolt three 530 is rotated, the first flexible inner expansion sleeve 320 is driven to move outward and disengage from the flexible expansion pin sleeve 310, and the first flexible inner expansion sleeve 320 is removed.

[0056] After the first flexible inner expansion sleeve 320 and the second flexible inner expansion sleeve 330 are removed, the taper extrusion force acting on the flexible expansion pin sleeve 310 disappears, and the outer diameter of the flexible expansion pin sleeve 310 and the hole diameter of the first through hole on the power output flange 100 and the power input flange 200 are restored to clearance fit. A disassembly bolt is placed in the light hole or the fifth threaded hole 313 of the flexible expansion pin sleeve 310, and the flexible expansion pin sleeve 310 is easily pulled out of the first through hole through the disassembly bolt, and the disassembly of the flexible expansion pin 300 is completed.

[0057] Method two for disassembling flexible expansion pin 300:

[0058] As shown in Figure 1 , when the through hole of the axis of the second flexible inner expansion sleeve 330 includes a sixth threaded hole 331, and the through hole inside the flexible expansion pin sleeve 310 includes a seventh threaded hole 311, and the sixth threaded hole 331 of the axis of the second flexible inner expansion sleeve 330 is larger than the seventh threaded hole 311 inside the flexible expansion pin sleeve 310, flexible expansion pin 300 can also be disassembled by the following method: first, remove the first force bolt 340; as shown in Figure 1 、 Figure 3 , screw in disassembly bolt one 510, so that the thread of disassembly bolt one 510 cooperates with the sixth threaded hole 331 of the second flexible inner expansion sleeve 330; continue to screw in disassembly bolt one 510, so that the end of disassembly bolt one 510 abuts against the step face inside the flexible expansion pin sleeve 310; then rotate disassembly bolt one 510 to drive the second flexible inner expansion sleeve 330 to move outward and disengage from the flexible expansion pin sleeve 310, and the second flexible inner expansion sleeve 330 is removed together with nut 350 and disassembly bolt one 510.

[0059] As shown in Figure 3 、 Figure 4 , screw in disassembly bolt four 550, so that the thread of disassembly bolt four 550 cooperates with the seventh threaded hole 311 inside the flexible expansion pin sleeve 310; continue to screw in disassembly bolt four 550, so that the end of disassembly bolt four 550 abuts against the inner end face of the first flexible inner expansion sleeve 320; then screw in disassembly bolt four 550 and put a disassembly bolt in the through hole or fifth threaded hole 313 of the flexible expansion pin sleeve 310, control the disassembly bolt to avoid the flexible expansion pin sleeve 310 from rotating with the first flexible inner expansion sleeve 320, so that the first flexible inner expansion sleeve 320 smoothly disengages from the flexible expansion pin sleeve 310, and the first flexible inner expansion sleeve 320 is removed.

[0060] After the first flexible inner expansion sleeve 320 and the second flexible inner expansion sleeve 330 are removed, the taper extrusion force on the flexible expansion pin sleeve 310 disappears, the outer diameter of the flexible expansion pin sleeve 310 and the hole diameter of the first through hole on the power output flange 100 and the power input flange 200 return to clearance fit, and the flexible expansion pin sleeve 310 can be easily pulled out of the first through hole through the disassembly bolt in the through hole or fifth threaded hole 313 of the flexible expansion pin sleeve 310; the disassembly of the flexible expansion pin 300 is completed.

[0061] Disassembly of rigid expansion pin 400:

[0062] First, remove the second force bolt 430; then, screw in disassembly bolt two 520, as shown in Figure 1 、 Figure 2The thread of the dismounting bolt two 520 is matched with the second threaded hole 411 of the rigid expansion pin sleeve 410, the dismounting bolt two 520 is screwed in continuously, the end of the dismounting bolt two 520 is abutted against the end face of the bottom hole of the third threaded hole 421 of the conical expansion pin core 420, then the conical expansion pin core 420 is rotated, the conical expansion pin core 420 moves outward and is separated from the rigid expansion pin sleeve 410, the extrusion force of the conical surface on the rigid expansion pin sleeve 410 disappears, the outer diameter of the rigid expansion pin sleeve 410 and the hole diameter of the clearance fit between the power output flange 100 and the power input flange 200 are restored, the dismounting bolt two 520 is pulled out from the hole of the power output flange 100 and the power input flange 200 with the rigid expansion pin sleeve 410, and the rigid expansion pin sleeve 410 is dismounted.

[0063] The second force bolt 430 is screwed into the third threaded hole 421 of the conical expansion pin core again, the conical expansion pin core 420 is taken out of the hole of the power output flange 100 and the power input flange 200 by the second force bolt 430, and the conical expansion pin core 420 is dismounted.

[0064] After the flexible expansion pin 300 and the rigid expansion pin 400 are dismounted, the bolt pair 600 is also dismounted, and the dismounting work of the utility model is completed.

[0065] In summary, the utility model discloses a large torque flange structure connected by expansion pins, when preassembling, the outer diameter of the expansion pin is clearance fit with the hole of the power output flange and the power input flange, so that the installation is convenient, when dismounting, the expansion pin sleeve and the internal elements are separated first by using a tool to dismount the bolt, the outer diameter of the expansion pin is clearance fit with the hole of the two flanges first and then is dismounted, so that the dismounting is convenient, the clearance fit makes the machining precision and the position degree of the hole of the flange low, and the production cost is reduced, and the size of the hole of the flange is not limited, so that the hole diameter of the flange can be up to 100mm or even larger.

[0066] The above embodiment only exemplarily illustrates the principle and the effect of the utility model, and is not used for limiting the utility model, and any person skilled in the art can modify or change the above embodiment without departing from the spirit and the category of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and the technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A large torque flange structure connected by expansion pins, characterized by, The power output flange (100) and the power input flange (200) are provided with a plurality of groups of first through holes corresponding one by one and having the same aperture, and each group of first through holes is provided with a flexible expansion pin (300); The flexible expansion pin (300) comprises a flexible expansion pin sleeve (310), a first flexible inner expansion sleeve (320), a second flexible inner expansion sleeve (330) and a first force bolt (340); the outer diameter of the flexible expansion pin sleeve (310) is clearance fitted with the aperture of the first through hole on the power output flange (100) and the power input flange (200), both ends of the flexible expansion pin sleeve (310) are respectively provided with a taper hole with a large external aperture and a small internal aperture, and the flexible expansion pin sleeve (310) is internally provided with a through hole penetrating the taper holes at both ends; the first flexible inner expansion sleeve (320) is arranged in the taper hole at one end of the flexible expansion pin sleeve (310), the outer wall of the first flexible inner expansion sleeve (320) is taper surface fitted with the inner wall of the taper hole at one end of the flexible expansion pin sleeve (310), and the axis of the first flexible inner expansion sleeve (320) is provided with a first threaded hole (321); the second flexible inner expansion sleeve (330) is arranged in the taper hole at the other end of the flexible expansion pin sleeve (310), the outer wall of the second flexible inner expansion sleeve (330) is taper surface fitted with the inner wall of the taper hole at the other end of the flexible expansion pin sleeve (310), and the axis of the second flexible inner expansion sleeve (330) is provided with a through hole; the first force bolt (340) penetrates the through hole in the axis of the second flexible inner expansion sleeve (330), the through hole in the interior of the flexible expansion pin sleeve (310) and the first threaded hole (321) in the axis of the first flexible inner expansion sleeve (320).

2. The large torque flange structure connected by expansion pins according to claim 1, characterized in that: The power output flange (100) and the power input flange (200) are further provided with a plurality of groups of light holes corresponding one by one and having the same aperture, wherein the light hole on one flange is a through hole, and the light hole on the other flange is a blind hole; each group of light holes on the power output flange (100) and the power input flange (200) is provided with a rigid expansion pin (400); The rigid expansion pin (400) comprises a rigid expansion pin sleeve (410), a tapered expansion pin core (420) and a second force bolt (430); the outer diameter of the rigid expansion pin sleeve (410) is clearance fitted with the aperture of the light hole on the power output flange (100) and the power input flange (200), one end of the rigid expansion pin sleeve (410) adjacent to the blind hole is provided with a taper hole with a large external aperture and a small internal aperture, and the other end of the rigid expansion pin sleeve (410) is provided with a second threaded hole (411) penetrating the taper hole; The conical expansion pin core (420) is arranged in the tapered hole of the rigid expansion pin sleeve (410), the outer wall of the conical expansion pin core (420) is matched with the inner wall of the tapered hole of the rigid expansion pin sleeve (410) through a tapered surface, and the axis of the end with a smaller outer diameter of the conical expansion pin core (420) is provided with a third threaded hole (421); the end surface of the bottom hole of the third threaded hole (421) is a plane. The second force bolt (430) passes through the second threaded hole (411) of the rigid expansion pin sleeve and is matched with the third threaded hole (421) of the conical expansion pin core.

3. The large torque flange structure connected by expansion pins according to claim 2, characterized in that: The tapered hole of the rigid expansion pin sleeve (410) is provided with at least one axial incision (412) arranged along the circumference on the corresponding side wall.

4. The large torque flange structure connected by expansion pins according to claim 2, characterized by: The outer edge of the end of the rigid expansion pin sleeve (410) away from the blind hole is provided with a first boss (413).

5. The large torque flange structure connected by expansion pins according to claim 4, characterized in that: The side wall of the first boss (413) of the rigid expansion pin sleeve is provided with a light hole or a fourth threaded hole (414).

6. The large torque flange structure connected by expansion pins according to claim 2, characterized by: The outer side surface of the rigid expansion pin sleeve (410) is provided with a first groove (415) at the joint surface of the power output flange (100) and the power input flange (200).

7. The large torque flange structure connected by expansion pins according to any one of claims 1 to 6, characterized in that: The outer edge of the end of the flexible expansion pin sleeve (310) matched with the first flexible inner expansion sleeve (320) is provided with a second boss (312); the end with a larger outer diameter of the second flexible inner expansion sleeve (330) is provided with a threaded portion (332), the threaded portion (332) is provided with a nut (350), and the nut (350) and the second boss (312) of the flexible expansion pin sleeve sandwich the power output flange (100) and the power input flange (200).

8. The large torque flange structure connected by expansion pins according to claim 7, characterized by: The side wall of the second boss (312) of the flexible expansion pin sleeve is provided with a light hole or a fifth threaded hole (313).

9. The large torque flange structure connected by expansion pins according to any one of claims 1 to 6, characterized in that: The through hole of the axis of the second flexible inner expansion sleeve (330) includes a sixth threaded hole (331), the through hole in the flexible expansion pin sleeve (310) includes a seventh threaded hole (311), and the sixth threaded hole (331) of the axis of the second flexible inner expansion sleeve (330) is larger than the seventh threaded hole (311) in the flexible expansion pin sleeve (310).

10. The large torque flange structure connected by expansion pins according to any one of claims 1 to 6, characterized in that: The outer side surface of the flexible expansion pin sleeve (310) is provided with a second groove (314) at the joint surface of the power output flange (100) and the power input flange (200).

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