Quick reloading clamp for testing service life of pneumatic wrench

Abstract

The invention relates to the technical field of air wrench clamping, and discloses an air wrench service life test rapid reloading clamp which comprises a mounting seat, a resistance piece fixed to the mounting seat and a clamping part, the clamping part is mounted on the mounting seat and used for limiting an air wrench and enabling the air wrench to be matched with the resistance piece, and the clamping part comprises a barrel, a clamping part and a clamping part, the base is mounted on the mounting seat; the first limiting ring and the second limiting ring are both arranged in the cylinder in a sliding mode, clamping parts driven by air pressure are arranged on the inner side of the first limiting ring and the inner side of the second limiting ring, and the clamping parts are used for clamping an air wrench in the radial direction. The first limiting ring and the second limiting ring which are driven by air pressure can be adjusted in a sliding mode in the axial direction of the barrel, radial clamping of the first cross-shaped block and the second cross-shaped block is combined, extrusion fixing of the first cross-shaped block and the second cross-shaped block and the inner wall of the barrel is achieved, and the device can adapt to wind wrench bodies and square drives of different sizes and shapes. And the position of the barrier layer is adjustable, so that the fixture is effectively compatible with square drives with different depths, and the problem of infirm fixation caused by model difference of a traditional fixture is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air wrench clamping, and specifically to a quick replacement fixture for air wrench life testing. Background Art

[0002] As an efficient pneumatic assembly tool, pneumatic wrenches are widely used in fields such as automobile manufacturing, rail transit, aerospace, and heavy machinery assembly. Its core function is to achieve high torque output through compressed air drive to meet the rapid tightening requirements of high-strength bolts. However, as an industrial tool with high-frequency use, the fatigue life of its core components directly determines the equipment reliability and maintenance cost. Therefore, before the research and development and factory shipment of pneumatic wrenches, it is necessary to evaluate their durability, sealing performance, and dynamic stability through life tests under simulated actual working conditions. In this process, the design of the test fixture directly affects the test efficiency, data accuracy, and equipment maintenance cost.

[0003] Importantly, some of the pneumatic wrenches in the same batch need to be taken out for testing to ensure good stability of the pneumatic wrenches in the same batch. Currently, when detecting pneumatic wrenches, no-load operation and load operation tests are carried out, so that the "square drive" of the pneumatic wrench is matched with the life test equipment, and then the test is realized. However, when matching the "square drive" with the life test equipment, the pneumatic wrench also needs to be fixed to ensure its stable state and avoid vibration.

[0004] The current problem is that when the pneumatic wrench is fixed, it needs to be fixed according to the position where the "square drive" is matched with the life test equipment. There are certain differences in the "square drive" and the pneumatic wrench body of different pneumatic wrenches, and differential fixing is required according to the differences during fixing. Therefore, vibration is likely to occur after fixing, resulting in inaccurate data due to the vibration of the pneumatic wrench. Summary of the Invention

[0005] The purpose of the present invention is to provide a quick replacement fixture for air wrench life testing to solve the problems raised in the above background art.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A quick replacement fixture for air wrench life testing, including a mounting base, a resistance piece fixed to the mounting base, and further including a clamping portion. The clamping portion is installed on the mounting base and is used to limit the air wrench and make the air wrench cooperate with the resistance piece. The clamping portion includes:

[0007] A cylinder body installed on the mounting base;

[0008] A first limiting ring and a second limiting ring, both slidably arranged in the cylinder body. The inner sides of the first limiting ring and the second limiting ring both have clamping portions driven by air pressure, and the clamping portions are used to radially clamp the air wrench;

[0009] An outer retaining piece, coaxial with the cylinder body, and a telescopic shaft fixed by air pressure is connected between the outer retaining piece and the cylinder body for axially clamping the pneumatic wrench.

[0010] A transmission pipe for transmitting gas is connected to the first limiting ring, the second limiting ring and the telescopic shaft.

[0011] Further, a fitting strip extending along its axis is integrally formed on the inner wall of the cylinder body, and fitting grooves for fitting with the fitting strip are respectively formed on the outer sides of the first limiting ring and the second limiting ring, so that the first limiting ring and the second limiting ring slide along the cylinder body.

[0012] Further, a through fitting port is formed on the outer side of the cylinder body, and air inlet ends extending into the fitting port are respectively provided on the outer sides of the first limiting ring and the second limiting ring, and the air inlet ends are connected to the transmission pipe.

[0013] The clamping part includes a first cross block and a second cross block. Annular cavities which are circumferentially arranged and communicated with the air inlet ends are respectively formed in the first limiting ring and the second limiting ring. A first cross groove and a second cross groove are also respectively formed in the first limiting ring and the second limiting ring. One end of the first cross groove is communicated with the annular cavity, and the other end penetrates inward. One end of the second cross groove is communicated with the annular cavity, and the other end penetrates outward. The first cross block and the second cross block are respectively located in the first cross groove and the second cross groove. When air enters the annular cavity, the first cross block and the second cross block respectively extend inward and outward for support.

[0014] Further, a plurality of the first cross grooves and the first cross blocks are circumferentially arranged for circumferentially supporting the pneumatic wrench inside, and the second cross blocks in the first limiting ring and the second limiting ring are respectively used for abutting against the inner walls of the first limiting ring and the second limiting ring.

[0015] Further, one end of the first limiting ring has a blocking layer, a round hole penetrates through the axis of the blocking layer, a polygonal end is integrally formed at the axis of the resistance piece, the polygonal end extends into the round hole, a square drive matching with the polygonal end is provided at the output end of the pneumatic wrench, and the square drive abuts against the end face of the blocking layer.

[0016] Further, the second limiting ring is annular and can axially move inside the cylinder body for fixing the pneumatic wrench.

[0017] Further, the telescopic shaft includes a sleeve shaft, a sleeve, an outer extension pipe and a resistance shaft.

[0018] The sleeve shaft is sleeved with the sleeve, a spring in a stretched state is arranged inside the sleeve, the outer extension pipe is integrally formed with the sleeve and is perpendicular to the sleeve, the resistance shaft is sleeved inside the outer extension pipe, the outer end of the outer extension pipe is connected to the transmission pipe, and when there is air pressure inside the outer extension pipe, the resistance shaft is pushed to abut against the sleeve shaft to fix the position of the sleeve shaft.

[0019] Furthermore, there is a seal between the outer extension pipe and the resistance shaft.

[0020] Furthermore, a protective frame is fixed on the mounting base. The protective frame can be opened and closed and abuts against the upper end of the pneumatic wrench.

[0021] Furthermore, a resistance disc is also provided outside the resistance piece for adjusting the resistance of the resistance piece.

[0022] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0023] 1. The limiting rings I and II driven by air pressure can slide axially along the cylinder body for adjustment. Combined with the radial clamping of the cross blocks I and II and the extrusion fixation with the inner wall of the cylinder body, it can adapt to pneumatic wrench bodies and square drives of different sizes and shapes. With the adjustable position of the blocking layer, it can effectively be compatible with square drives of different depths, solving the problem of loose fixation caused by model differences in traditional clamps.

[0024] 2. Multiple groups of cross blocks I are circumferentially and evenly distributed to clamp the pneumatic wrench body. The air pressure drives the cross block II to lock the positions of the limiting rings I and II outward to form a constraint. The telescopic shaft initially fits through the spring pre-tightening of the outer retaining piece, and then the pneumatic wrench is completely limited by air pressure, eliminating the circumferential offset and vibration of the pneumatic wrench during the test.

[0025] 3. The pneumatic wrench is axially and radially limited by air pressure, effectively reducing the clamping time and facilitating quick replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0027] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 is a schematic diagram of the structures of various components at the upper end of the mounting base of the present invention;

[0029] Figure 3 is an exploded structural schematic diagram of the resistance piece and the clamping connection of the present invention;

[0030] Figure 4 is an exploded structural schematic diagram of the clamping connection of the present invention;

[0031] Figure 5 is a half-sectional structural schematic diagram of the limiting ring I of the present invention;

[0032] Figure 6 is a half-sectional structural schematic diagram of the limiting ring II of the present invention;

[0033] Figure 7 It is a schematic cross-sectional structure diagram of the telescopic shaft of the present invention;

[0034] Figure 8 It is a schematic half-sectional structure diagram of the resistance piece and the clamping part of the present invention;

[0035] Figure 9 It is a schematic diagram of the mating structure between the square drive and the polygonal end of the present invention;

[0036] Figure 10 It is a schematic diagram of the mating structure between the square drive and the polygonal end of the present invention;

[0037] Figure 11 It is a schematic diagram of the mating structure between the square drive and the polygonal end of the present invention.

[0038] In the figure: 1. Mounting seat; 2. Protective frame; 3. Resistance piece; 31. Polygonal end; 32. Resistance disc; 4. Clamping part; 41. Cylinder; 411. Fitting strip; 412. Fitting port; 42. First limiting ring; 421. Fitting groove; 422. Air inlet end; 423. Blocking layer; 424. Round hole; 43. Second limiting ring; 44. Outer retaining piece; 45. Telescopic shaft; 451. Sleeve shaft; 452. Sleeve; 453. Outer extension pipe; 454. Resistance shaft; 46. Conduit; 47. Clamping part; 471. Annular cavity; 472. First cross groove; 473. First cross block; 474. Second cross groove; 475. Second cross block; 5. Square drive. Specific embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] Please refer to Figures 1-11 , the present invention provides a technical solution: A quick replacement fixture for the life test of a pneumatic wrench, including a mounting seat 1, a resistance piece 3 fixed to the mounting seat 1, and further including a clamping part 4. The clamping part 4 is installed on the mounting seat 1. The clamping part 4 is used to limit the pneumatic wrench and make the pneumatic wrench cooperate with the resistance piece 3. The clamping part 4 includes:

[0041] A cylinder 41 installed on the mounting seat 1;

[0042] A first limiting ring 42 and a second limiting ring 43, both slidably arranged in the cylinder 41. The inner sides of the first limiting ring 42 and the second limiting ring 43 both have a clamping part 47 driven by air pressure. The clamping part 47 is used to radially clamp the pneumatic wrench;

[0043] The outer retaining piece 44 is coaxial with the cylinder body 41. A telescopic shaft 45 fixed by air pressure is connected between the outer retaining piece 44 and the cylinder body 41 for axially clamping the pneumatic wrench.

[0044] The conduit 46 is used for transmitting gas and is connected to the first limiting ring 42, the second limiting ring 43 and the telescopic shaft 45.

[0045] Specifically, a slidable first limiting ring 42 and a second limiting ring 43 are installed inside the cylinder body 41. Clamping portions 47 are provided inside both the first limiting ring 42 and the second limiting ring 43. The first limiting ring 42 and the second limiting ring 43 can move along the cylinder body 41. When there is air pressure inside the conduit 46, the clamping portions 47 inside the first limiting ring 42 and the second limiting ring 43 generate air pressure, causing the clamping portions 47 to extend inwards to clamp the pneumatic wrench. In addition, the clamping portions 47 can also extend outwards to limit the positions of the first limiting ring 42 and the second limiting ring 43 inside the cylinder body 41, ensuring radial limitation of the pneumatic wrench. The outer retaining piece 44 is connected to the cylinder body 41 through the telescopic shaft 45. A spring in a stretched state is provided inside the telescopic shaft 45. Under the action of the spring, the outer retaining piece 44 is driven to move, and the pneumatic wrench is pushed inwards, making the square drive 5 of the pneumatic wrench abut against the blocking layer 423 of the first limiting ring 42 to axially limit the pneumatic wrench. It should be noted that under the action of air pressure, the position of the telescopic shaft 45 is also fixed, ensuring that the square drive 5 of the pneumatic wrench avoids large friction and at the same time completely limits the pneumatic wrench.

[0046] A mating strip 411 extending along its axis is integrally formed on the inner wall of the cylinder body 41. Mating grooves 421 mating with the mating strip 411 are provided on the outer sides of both the first limiting ring 42 and the second limiting ring 43, enabling the first limiting ring 42 and the second limiting ring 43 to slide along the cylinder body 41.

[0047] The first limiting ring 42 and the second limiting ring 43 inside the cylinder body 41 can only move along the axis of the cylinder body 41 to avoid rotation, ensuring that the pneumatic wrench is limited without rotation when being positioned.

[0048] A through mating port 412 is provided on the outer side of the cylinder body 41. Intake ends 422 extending into the mating port 412 are provided on the outer sides of both the first limiting ring 42 and the second limiting ring 43. The intake ends 422 are connected to the conduit 46.

[0049] The clamping part 47 includes a first cross-shaped block 473 and a second cross-shaped block 475. Annular cavities 471 that are circumferentially arranged and communicate with the air inlet end 422 are formed in both the first limiting ring 42 and the second limiting ring 43. Cross slots 472 and 474 are also formed in both the first limiting ring 42 and the second limiting ring 43. One end of the cross slot 472 communicates with the annular cavity 471 and the other end penetrates inward. One end of the cross slot 474 communicates with the annular cavity 471 and the other end penetrates outward. The first cross-shaped block 473 and the second cross-shaped block 475 are respectively located in the cross slots 472 and 474. When air enters the annular cavity 471, the first cross-shaped block 473 and the second cross-shaped block 475 extend inward and outward respectively for support.

[0050] Specifically, the air inlet ends 422 of the first limiting ring 42 and the second limiting ring 43 can move along the mating port 412, and the first limiting ring 42 and the second limiting ring 43 can also easily change their positions. Since the shapes of different models of pneumatic wrenches are different, when the second limiting ring 43 moves, it can be fixed at the position where the pneumatic wrench is most easily fixed to limit the pneumatic wrench.

[0051] Both the first limiting ring 42 and the second limiting ring 43 have an annular cavity 471 inside. The inside of the annular cavity 471 communicates with the transmission pipe 46. During the process of the transmission pipe 46 delivering air, the pressure inside the annular cavity 471 changes, pushing the first cross-shaped block 473 to move inward, and similarly pushing the second cross-shaped block 475 to move outward. Based on this, the pneumatic wrench is fixed inward, and the first limiting ring 42 and the second limiting ring 43 are fixed outward. From the first limiting ring 42 and the second limiting ring 43 being able to move and adjust their positions to the first limiting ring 42 and the second limiting ring 43 being fixed to the cylinder body 41 and the pneumatic wrench being fixed, it is easy to operate and can adapt to different specifications of pneumatic wrenches.

[0052] There are multiple cross slots 472 and first cross-shaped blocks 473 that are circumferentially arranged, used to support the internal pneumatic wrench in the circumferential direction. The second cross-shaped blocks 475 in the first limiting ring 42 and the second limiting ring 43 are respectively used to abut against the inner walls of the first limiting ring 42 and the second limiting ring 43 to fix the pneumatic wrench in the circumferential direction, so that the pneumatic wrench is fixed.

[0053] One end of the first limiting ring 42 has a blocking layer 423. A round hole 424 penetrates through the axis of the blocking layer 423. A polygonal end 31 is integrally formed at the axis of the resistance piece 3. The polygonal end 31 extends into the round hole 424. The output end of the pneumatic wrench has a square drive 5 that cooperates with the polygonal end 31, and the square drive 5 abuts against the end face of the blocking layer 423.

[0054] Specifically, the blocking layer 423 is used to abut against the square drive 5. However, when the length and depth of the square drive 5 change, it is necessary to move the first limiting ring 42 so that the blocking layer 423 abuts against the square drive 5, as shown in Figure 9 、 Figure 10 、 Figure 11 shown.Figure 9 The square drive 5 is in complete fit with the polygonal end 31 and abuts against the blocking layer 423. Figure 10 The square drive 5 is in complete fit with the polygonal end 31 but is short in length. It is necessary to move the limiting ring 42 so that the blocking layer 423 abuts against the square drive 5. Figure 11 The square drive 5 is not in complete fit with the polygonal end 31. Since the square drive 5 is too long, but the blocking layer 423 still abuts against the square drive 5. Therefore, according to the change of the square drive 5, manually control the position of the limiting ring 42 so that the blocking layer 423 of the limiting ring 42 abuts against the square drive 5, and the rear end of the pneumatic wrench abuts against the outer retaining piece 44. Subsequently, under the action of air pressure, complete limiting is achieved.

[0055] The limiting ring 43 is annular and can axially move inside the cylinder body 41 for fixing the pneumatic wrench. The limiting ring 43 sleeves the pneumatic wrench and can move to different positions of the pneumatic wrench to fix it.

[0056] The telescopic shaft 45 includes a sleeve shaft 451, a sleeve 452, an outer extension tube 453 and a resistance shaft 454;

[0057] The sleeve shaft 451 is sleeved with the sleeve 452. There is a spring in a stretched state inside the sleeve 452. The outer extension tube 453 is integrally formed with the sleeve 452 and is perpendicular to the sleeve 452. The resistance shaft 454 is sleeved inside the outer extension tube 453. The outer end of the outer extension tube 453 is connected to the conduit 46. When there is air pressure inside the outer extension tube 453, it pushes the resistance shaft 454 to abut against the sleeve shaft 451 to fix the position of the sleeve shaft 451.

[0058] Specifically, after the pneumatic wrench is limited, if it needs to be completely fixed by air pressure, fixing the telescopic shaft 45 means fixing the outer retaining piece 44. Therefore, when there is air pressure inside the outer extension tube 453, it pushes the resistance shaft 454 to abut against the sleeve shaft 451 to fix the position of the sleeve shaft 451.

[0059] The outer extension tube 453 and the resistance shaft 454 are sealed so that the resistance shaft 454 can move under the action of air pressure.

[0060] A protective frame 2 is fixed on the mounting base 1. The protective frame 2 can be opened and closed and abuts against the upper end of the pneumatic wrench to prevent the pneumatic wrench from flying outwards due to being not firmly fixed.

[0061] There is also a resistance disc 32 outside the resistance piece 3 for adjusting the resistance of the resistance piece 3 to realize the test of different resistances of the pneumatic wrench.

[0062] Working principle of the present invention: In the initial stage, the transfer conduit 46 is connected to the air pump but in a shutdown state. Manually pull the outer baffle 44 outwards to stretch the spring inside the telescopic shaft 45. Place the pneumatic wrench into the cylinder body 41, and make the outer end of the square drive 5 of the pneumatic wrench abut against the blocking layer 423, and the square drive 5 cooperate with the polygonal end 31. Then loosen the outer baffle 44, and it moves inwards under the action of the spring of the telescopic shaft 45, so that the outer end of the square drive 5 at the end of the pneumatic wrench abuts against the blocking layer 423, and the other end of the pneumatic wrench abuts against the outer baffle 44, initially fixing the pneumatic wrench.

[0063] In the next stage, the transfer conduit 46 transmits gas, causing air pressure to be generated in the annular cavities 471 of the first limiting ring 42 and the second limiting ring 43, driving the first cross block 473 to move inwards and the second cross block 475 to move outwards, realizing that multiple first cross blocks 473 clamp the pneumatic wrench, and the second cross block 475 presses against the inner wall of the cylinder body 41, fixing the positions of the first limiting ring 42 and the second limiting ring 43 and clamping the pneumatic wrench radially at the same time. Secondly, the air pressure also pushes the resistance shaft 454 to move along the outer extension pipe 453 and abut against the sleeve shaft 451, fixing the relative positions of the sleeve shaft 451 and the sleeve 452, and fixing the position of the outer baffle 44, realizing the fixing of the axial position of the pneumatic wrench.

[0064] The above-mentioned method fixes both the radial and axial positions of the pneumatic wrench through air pressure, completely restricting the position of the pneumatic wrench, keeping the square drive 5 of the pneumatic wrench stable during rotation, avoiding vibration and affecting the test results. In addition, in addition to completely restricting the pneumatic wrench, it can also quickly install and disassemble the pneumatic wrench, and quickly test different batches of pneumatic wrenches continuously.

[0065] It should be noted that due to the different sizes of pneumatic wrenches of different specifications, even the depths of the square drives 5 of the same specification are different. For example Figure 9 、 Figure 10 and Figure 11 show square drives 5 of different depths. In order to completely limit the square drive 5, the end of the square drive 5 needs to abut against the blocking layer 423 of the first limiting ring 42, and the rear end of the pneumatic wrench needs to abut against the outer baffle 44 to achieve complete limitation. In addition, it should be noted that due to the limited restoring effect of the spring in the telescopic shaft 45, the friction force at the position where the rear end of the pneumatic wrench abuts against the outer baffle 44 and the position where the end of the square drive 5 abuts against the blocking layer 423 of the first limiting ring 42 will not be too large, only realizing fitting limitation. Under the action of air pressure, the positions of the first limiting ring 42 and the outer baffle 44 are fixed, so that even during the operation of the square drive 5, vibration will not be generated.

[0066] The above-mentioned shows that even the depths of the square drives 5 of the same specification are different. For example Figure 9 、 Figure 10 and Figure 11 The dotted lines shown are the positions of the pneumatic wrench. For example Figure 9The shown square drive 5 just mates with the polygonal end 31 and just abuts against the blocking layer 423, as Figure 10 The shown square drive 5 mates with the polygonal end 31, but fails to abut against the blocking layer 423. Therefore, it is necessary to move the first limiting ring 42 so that the square drive 5 abuts against the blocking layer 423, as Figure 11 The shown square drive 5 mates with the polygonal end 31. The depth of the square drive 5 is greater than the length of the polygonal end 31, and it can also make the square drive 5 abut against the blocking layer 423. Based on this, when the square drive 5 with different depths mates with the polygonal end 31, the pneumatic wrench can be completely limited by moving the first limiting ring 42.

[0067] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0068] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wind vane life test quick-change fixture, comprising a mounting seat (1) and a resistance sheet (3) fixed to the mounting seat (1), characterized in that: It also comprises a clamping portion (4), the clamping portion (4) being mounted on the mounting seat (1), the clamping portion (4) being used to limit the wind vane and enable the wind vane to cooperate with the resistance sheet (3), the clamping portion (4) comprising: A cylinder (41) mounted on the mounting seat (1); The first limiting ring (42) and the second limiting ring (43) are both slidably disposed in the cylinder (41), and the inner sides of the first limiting ring (42) and the second limiting ring (43) are provided with a clamping portion (47) driven by air pressure, and the clamping portion (47) is used to clamp the wind vane radially; An outer baffle (44) is coaxial with the cylinder (41), and a telescopic shaft (45) fixed by air pressure is connected between the outer baffle (44) and the cylinder (41) for axially clamping the wind vane; The conducting tube (46) is used for transmitting gas and is connected to the first limiting ring (42), the second limiting ring (43) and the telescopic shaft (45).

2. The wind vane life test quick-change fixture according to claim 1 is characterized by: The inner wall of the cylinder (41) is integrally provided with a matching strip (411) extending along its axis, and the outer sides of the first limiting ring (42) and the second limiting ring (43) are provided with matching grooves (421) matching with the matching strip (411), so that the first limiting ring (42) and the second limiting ring (43) can slide along the cylinder (41).

3. The wind vane life test quick-change fixture according to claim 1 is characterized by: The outer side of the cylinder (41) is provided with a mating opening (412) which penetrates through the cylinder, and the outer sides of the first limiting ring (42) and the second limiting ring (43) are provided with an air inlet end (422) which extends into the mating opening (412), and the air inlet end (422) is connected to the conducting pipe (46); The clamping portion (47) comprises a cross block 1 (473) and a cross block 2 (475). The limiting ring 1 (42) and the limiting ring 2 (43) are both provided with an annular cavity (471) which is arranged circumferentially and communicates with the air inlet end (422). The limiting ring 1 (42) and the limiting ring 2 (43) are also provided with a cross groove 1 (472) and a cross groove 2 (474). One end of the cross groove 1 (472) is communicated with the annular cavity (471) and the other end thereof penetrates inwardly. One end of the cross groove 2 (474) is communicated with the annular cavity (471) and the other end thereof penetrates outwardly. The cross block 1 (473) and the cross block 2 (475) are respectively located in the cross groove 1 (472) and the cross groove 2 (474). When air is introduced into the annular cavity (471), the cross block 1 (473) extends inwardly and the cross block 2 (475) extends outwardly for support.

4. The quick-change fixture for testing the life of an air vane according to claim 3 is characterized by: The cross groove 1 (472) and the cross block 1 (473) are both provided with a plurality of circumferentially arranged ones for supporting the internal wind vane in a circumferential direction. The cross block 2 (475) in the limiting ring 1 (42) and the limiting ring 2 (43) are respectively used to abut against the inner wall of the limiting ring 1 (42) and the limiting ring 2 (43).

5. The wind vane life test quick-change fixture according to claim 1 is characterized by: The limiting ring (42) has a blocking layer (423) at one end, a circular hole (424) penetrates the axis of the blocking layer (423), the resistance sheet (3) has a polygonal end (31) at the axis, the polygonal end (31) extends into the circular hole (424), and the output end of the wind vane has a square drive (5) matched with the polygonal end (31), and the square drive (5) abuts against the end surface of the blocking layer (423).

6. The wind vane life test quick-change fixture according to claim 1, characterized in that: The second limiting ring (43) is annular and can be located inside the cylinder (41) and move axially, and is used to fix the wind vane.

7. The wind vane life test quick-change fixture according to claim 1, characterized in that: The telescopic shaft (45) comprises a sleeve shaft (451), a sleeve (452), an outer extension tube (453) and a resistance shaft (454); The sleeve shaft (451) is sleeved with the sleeve (452), and the sleeve (452) has a spring in a stretched state inside. The outer extension tube (453) is integrally formed with the sleeve (452) and is perpendicular to the sleeve (452). The resistance shaft (454) is sleeved in the outer extension tube (453), and the outer end of the outer extension tube (453) is connected to the conductive tube (46). When there is air pressure inside the outer extension tube (453), the resistance shaft (454) is pushed against the sleeve shaft (451), thereby fixing the position of the sleeve shaft (451).

8. The wind vane life test quick-change fixture according to claim 7, characterized in that: The outer extension tube (453) and the resistance shaft (454) are sealed.

9. The wind vane life test quick-change fixture according to claim 1, characterized in that: A protective frame (2) is fixed on the mounting seat (1); the protective frame (2) can be opened and closed and abuts against the upper end of the wind vane.

10. The wind vane life test quick-change fixture according to claim 1, characterized in that: The resistance sheet (3) also has a resistance disk (32) on the outside thereof, which is used to adjust the resistance of the resistance sheet (3).

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