Five-degree-of-freedom test adjusting device and method for interference of open high-attack-angle support

Abstract

The invention provides an opening large-incidence-angle support interference five-degree-of-freedom test adjusting device and method, and belongs to the field of wind tunnel test equipment. The objective of the invention is to solve the problem of space angle and displacement deviation existing in connection of an existing model and support interference auxiliary measurement mechanism. The device comprises a bracket, a supporting seat, a tail end shaft, a transition shaft sleeve, a model connecting supporting rod, a spherical bearing seat, an X-axis movement adjusting supporting seat, a Y-axis movement adjusting supporting seat and a spherical bearing, the support is connected with the large incidence angle device through a bracket; an X-axis movable adjusting support and a Y-axis movable adjusting support are arranged in the support, the X-axis movable adjusting support is connected with a spherical bearing seat, and a spherical bearing is arranged in the spherical bearing seat; and the other end of the tail end shaft is connected with the model connecting support rod through the transition shaft sleeve. The problem of space angle and displacement deviation of connection between the model and the support interference auxiliary measurement mechanism is solved, the accuracy of connection between the model and the support interference auxiliary measurement mechanism is guaranteed, and the precision of a high-attack-angle test can be improved.

Description

Technical Field

[0001] The invention relates to the field of wind tunnel test equipment, and in particular to a five-degree-of-freedom test adjustment device and method for an opening large angle-of-attack bracket interference. Background Art

[0002] The aerodynamic problem of high angle of attack test is one of the key technologies in the development of advanced and highly maneuverable aircraft weapons, and its main test device is the high angle of attack device. The high angle of attack bracket interference test can accurately obtain the interference amount of the tail support system on the test results. When giving the aircraft tail support test results, the corresponding tail support system interference can be deducted. In the high angle of attack test, the model vibrates due to the aerodynamic force, airflow pulsation in the flow field, and airflow pulsation caused by the airflow separation of the model itself. Large vibrations can easily lead to structural damage to the model mechanism. The auxiliary measurement bracket used in the high angle of attack bracket interference test has relatively weak strength and stiffness, and is prone to deformation in the high angle of attack test. It is difficult to assemble it next time after disassembly, which seriously affects the efficiency of the high angle of attack test.

[0003] In the bracket interference auxiliary measurement mechanism, the connecting device connected to the bracket interference strut is its core functional component. Its efficient connection and accurate adjustment of the end strut and the strut connected to the model are important factors to ensure the smooth progress of the high angle of attack test. There are often spatial angle and displacement deviations between the existing model and the bracket interference auxiliary measurement mechanism, which have an adverse effect on the accuracy and reliability of the high angle of attack test, and may lead to large errors in the test data. Summary of the invention

[0004] A brief overview of the present invention is provided below in order to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify key or important parts of the present invention, nor is it intended to limit the scope of the present invention. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0005] In view of this, in order to solve the problem of spatial angle and displacement deviation in the connection between the existing model and the bracket interference auxiliary measurement mechanism, the present invention provides an opening large angle of attack bracket interference five-degree-of-freedom test adjustment device and method.

[0006] Solution 1: An open large angle of attack bracket interference five-degree-of-freedom test adjustment device, including a bracket and a bracket interference auxiliary measurement mechanism, wherein the bracket interference auxiliary measurement mechanism includes a support, an X-axis movement adjustment bolt, a Y-axis movement adjustment bolt, an X-axis rotation adjustment rod, an end shaft, a transition sleeve, a model connecting support rod, a spherical bearing seat, an X-axis movement adjustment support, a Y-axis movement adjustment support, a spherical bearing, a Y-axis rotation adjustment rod, a third-party annular sleeve, a first support, a second support, a third support, and a fourth support;

[0007] The support is symmetrically provided with brackets on the left and right sides, and the brackets are connected to the high angle of attack device;

[0008] A Y-axis movable adjustment support is slidably installed on the rear side of the support in the vertical direction, and an X-axis movable adjustment support is slidably installed on the front side of the Y-axis movable adjustment support in the horizontal direction. Two X-axis movable adjustment bolts pass through the left and right side plates of the support and are connected to the X-axis movable adjustment support. Two Y-axis movable adjustment bolts pass through the upper and lower side plates of the support and are connected to the Y-axis movable adjustment support.

[0009] The front side surface of the X-axis movable adjustment support is fixedly connected to the spherical bearing seat, and a spherical bearing is arranged inside the spherical bearing seat;

[0010] One end of the terminal shaft is fixedly connected to the spherical bearing through a shaft end retaining ring, and the other end is connected to the model connecting support rod through a transition sleeve;

[0011] The spherical bearing seat is provided with a first support and a second support, and the rear ends of the X-axis rotation adjustment rod and the Y-axis rotation adjustment rod 8 are connected to the first support and the second support;

[0012] The end shaft is sleeved with a third-party shaped sleeve, the third-party shaped sleeve is provided with a third support and a fourth support, and the front ends of the X-axis rotation adjustment rod and the Y-axis rotation adjustment rod are connected to the third support and the fourth support;

[0013] The X-axis rotation adjustment rod and the Y-axis rotation adjustment rod are distributed at an angle of 90 degrees;

[0014] The terminal shaft is connected to the lower side plate of the support through a fastening connection portion.

[0015] Further, the fastening connection portion includes a large washer, a first fastening nut, a fastener and a second fastening nut; the fastener includes a first square sleeve and a first stud;

[0016] The lower end of the first stud passes through the hole of the lower side plate of the support, and is connected to the support through a large gasket and a first fastening nut, and the upper end of the first stud is connected to the side of the first square sleeve;

[0017] A second square sleeve is sleeved on the end shaft, a second stud is provided on the left side of the second square sleeve, the left end of the second stud passes through the first square sleeve and is connected to the second fastening nut, and the relative position of the support and the end shaft is fixed by locking the first fastening nut and the second fastening nut.

[0018] Furthermore, the holes on the lower side plate of the support meet the requirement of the fastener to move accordingly with the displacement of the terminal shaft.

[0019] Furthermore, limit blocks are provided on both sides of the X-axis movable adjustment support and the Y-axis movable adjustment support.

[0020] Furthermore, the portion where the terminal shaft and the model connecting rod are inserted into the transition sleeve is knurled.

[0021] Furthermore, a clearance fit is adopted between the terminal shaft, the transition sleeve and the model connecting support rod.

[0022] Furthermore, a transition sleeve fixing screw is provided on the transition sleeve to fix the relative positions of the transition sleeve, the terminal shaft and the model connecting support rod.

[0023] Furthermore, the X-axis rotation adjustment rod and the Y-axis rotation adjustment rod are composed of a fisheye ball bearing and a double-headed reverse thread stud. The front end of the double-headed reverse thread stud is connected to the end shaft through the fisheye ball bearing, and the rear end of the double-headed reverse thread stud is connected to the spherical bearing seat through the fisheye ball bearing.

[0024] Solution 2: A method for adjusting the five-degree-of-freedom test of an open large angle-of-attack bracket, specifically comprising the following steps:

[0025] S1. Loosen the first fastening nut, the second fastening nut, the X-axis movement adjustment bolt, the Y-axis movement adjustment bolt, and the transition sleeve set screw;

[0026] S2. Adjust the Y-axis displacement of the terminal shaft by adjusting the two Y-axis movable adjustment bolts. After adjusting to the appropriate position, tighten the two Y-axis movable adjustment bolts to each other to lock the Y-axis position of the terminal shaft;

[0027] S3. Adjust the displacement of the terminal shaft in the X-axis direction by adjusting the two X-axis movable adjustment bolts. After adjusting to the appropriate position, tighten the two X-axis movable adjustment bolts to each other to lock the X-axis position of the terminal shaft;

[0028] S4. Adjust the X-axis rotation adjustment rod to adjust the rotation angle of the end shaft on the X-axis, and adjust the Y-axis rotation adjustment rod to adjust the rotation angle of the end shaft on the Y-axis. After adjusting to a position where the end shaft can be smoothly connected to the model connecting rod, self-lock the X-axis rotation adjustment rod and the Y-axis rotation adjustment rod to achieve preliminary fixation of the end shaft;

[0029] S5. Tighten the second fastening nut and the two first fastening nuts to strengthen the fixed end shaft;

[0030] S6. Slide the transition sleeve to connect the end shaft and the model connecting rod, tighten the transition sleeve set screw, fix the end shaft and the model connecting rod together, and the assembly is completed.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention effectively solves the problem of spatial angle and displacement deviation between the model and the bracket interfering with the auxiliary measurement mechanism, ensures the accuracy of the connection between the two, and helps to improve the accuracy of the high angle of attack test;

[0033] 2. The present invention adds a fastening component to increase the overall rigidity, effectively preventing the impact of vibration on the component during the high angle of attack test, and avoiding the risk of structural damage caused by vibration;

[0034] 3. In the present invention, the transition sleeve and the terminal shaft and the model connecting support rod are connected through clearance fit and corresponding fastening methods, so that the entire device is easy to operate during the adjustment process, which helps to improve the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0036] Figure 1 It is a general schematic diagram of an open large angle of attack bracket interference five-degree-of-freedom test adjustment device;

[0037] Figure 2 It is a stereogram of the support interference auxiliary measurement mechanism;

[0038] Figure 3 A half-section axonometric diagram of the support interference auxiliary measurement mechanism;

[0039] Figure 4 This is the main view of the bracket interference auxiliary measurement mechanism.

[0040] In the figure: 1-bracket interference auxiliary measurement mechanism bracket, 2-support, 3-X-axis movement adjustment bolt, 4-Y-axis movement adjustment bolt, 5-X-axis rotation adjustment rod, 6-end shaft, 7-transition sleeve, 8-model connecting support rod, 9-large gasket, 10-first fastening nut, 11-fastener, 12-second fastening nut, 13-spherical bearing seat, 14-transition sleeve fastening screw, 15-X-axis movement adjustment support, 16-Y-axis movement adjustment support, 17-spherical bearing, 18-Y-axis rotation adjustment rod, 19-first square sleeve, 20-first stud, 21-second square sleeve, 22-third square sleeve, 23-second stud, 24-first pillar, 25-second pillar, 26-third pillar, 27-fourth pillar. DETAILED DESCRIPTION

[0041] In order to make the technical solutions and advantages of the embodiments of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0042] Example 1, reference Figure 1-4 The present embodiment is described in detail. A five-degree-of-freedom test adjustment device for interference of an open large angle-of-attack bracket includes a bracket 1 and a bracket interference auxiliary measurement mechanism, wherein the bracket interference auxiliary measurement mechanism includes a support 2, an X-axis movement adjustment bolt 3, a Y-axis movement adjustment bolt 4, an X-axis rotation adjustment rod 5, an end shaft 6, a transition sleeve 7, a model connecting support rod 8, a spherical bearing seat 13, an X-axis movement adjustment support 15, a Y-axis movement adjustment support 16, a spherical bearing 17, a Y-axis rotation adjustment rod 18, a third shaped sleeve 22, a first support 24, a second support 25, a third support 26, and a fourth support 27;

[0043] The support 2 is symmetrically provided with brackets 1 on the left and right sides, and the brackets 1 are connected to the high angle of attack device;

[0044] A Y-axis movable adjustment support 16 is slidably mounted on the rear side of the support 2 in the vertical direction, and an X-axis movable adjustment support 15 is slidably mounted on the front side of the Y-axis movable adjustment support 16 in the horizontal direction. Two X-axis movable adjustment bolts 3 pass through the left and right side plates of the support 2 and are connected to the X-axis movable adjustment support 15. Two Y-axis movable adjustment bolts 4 pass through the upper and lower side plates of the support 2 and are connected to the Y-axis movable adjustment support 16.

[0045] The front side surface of the X-axis movable adjustment support 15 is fixedly connected to the spherical bearing seat 13, and a spherical bearing 17 is provided inside the spherical bearing seat 13;

[0046] One end of the terminal shaft 6 is fixedly connected to the spherical bearing 17 through a shaft end retaining ring, and the other end is connected to the model connecting rod 8 through a transition sleeve 7;

[0047] The spherical bearing seat 13 is provided with a first support 24 and a second support 25, and the rear ends of the X-axis rotation adjustment rod 5 and the Y-axis rotation adjustment rod 18 are connected to the first support 24 and the second support 25;

[0048] The terminal shaft 6 is sleeved with a third rectangular sleeve 22, on which a third pillar 26 and a fourth pillar 27 are provided, and the front ends of the X-axis rotation adjustment rod 5 and the Y-axis rotation adjustment rod 18 are connected to the third pillar 26 and the fourth pillar 27;

[0049] The X-axis rotation adjustment rod 5 and the Y-axis rotation adjustment rod 18 are distributed at an angle of 90 degrees;

[0050] The terminal shaft 6 is connected to the lower side plate of the support 2 via a fastening connection portion.

[0051] Further, the fastening connection portion includes a large washer 9, a first fastening nut 10, a fastener 11 and a second fastening nut 12; the fastener 11 includes a first square sleeve 19 and a first stud 20;

[0052] The lower end of the first stud 20 passes through the hole of the lower side plate of the support 2, and is connected to the support 2 through the large gasket 9 and the first fastening nut 10, and the upper end of the first stud 20 is connected to the side of the first square sleeve 19;

[0053] The terminal shaft 6 is sleeved with a second square sleeve 21, and a second stud 23 is provided on the left side of the second square sleeve 21. The left end of the second stud 23 passes through the first square sleeve 19 and is connected to the second fastening nut 12. The relative position of the support 2 and the terminal shaft 6 is fixed by locking the first fastening nut 10 and the second fastening nut 12.

[0054] Furthermore, the holes on the lower side plate of the support 2 meet the requirement that the fastener 11 moves accordingly with the displacement of the terminal shaft 6 .

[0055] Furthermore, limit blocks are provided on both sides of the X-axis movable adjustment support 15 and the Y-axis movable adjustment support 16 .

[0056] Furthermore, the portion where the terminal shaft 6 and the model connecting rod 8 are inserted into the transition sleeve 7 is knurled.

[0057] Furthermore, a clearance fit is adopted between the terminal shaft 6, the transition sleeve 7 and the model connecting support rod 8.

[0058] Furthermore, a transition sleeve fixing screw 14 is provided on the transition sleeve 7 to fix the relative positions of the transition sleeve 7, the terminal shaft 6 and the model connecting support rod 8.

[0059] Furthermore, the X-axis rotation adjustment rod 5 and the Y-axis rotation adjustment rod 18 are composed of a fisheye ball bearing and a double-headed reverse thread stud, the front end of the double-headed reverse thread stud is connected to the end shaft 6 through the fisheye ball bearing, and the rear end of the double-headed reverse thread stud is connected to the spherical bearing seat 13 through the fisheye ball bearing.

[0060] Embodiment 2: A method for adjusting the five-degree-of-freedom test of an open large angle-of-attack bracket interference, specifically comprising the following steps:

[0061] S1. Loosen the first fastening nut 10, the second fastening nut 12, the X-axis movement adjustment bolt 3, the Y-axis movement adjustment bolt 4, and the transition sleeve set screw 14;

[0062] S2. Adjust the displacement of the terminal shaft 6 in the Y-axis direction by adjusting the two Y-axis movable adjustment bolts 4. After adjusting to the appropriate position, tighten the two Y-axis movable adjustment bolts 4 to each other to lock the terminal shaft 6 in the Y-axis position;

[0063] S3. Adjust the displacement of the end shaft 6X axis direction by adjusting the two X-axis movable adjustment bolts 3. After adjusting to the appropriate position, tighten the two X-axis movable adjustment bolts 3 to each other to lock the end shaft 6X axis position;

[0064] S4. Adjust the rotation angle of the terminal shaft 6 on the X-axis by adjusting the X-axis rotation adjustment rod 5, and adjust the rotation angle of the terminal shaft 6 on the Y-axis by adjusting the Y-axis rotation adjustment rod 18. After adjusting to a position where the terminal shaft 6 can be smoothly connected with the model connecting rod 8, the X-axis rotation adjustment rod 5 and the Y-axis rotation adjustment rod 18 are self-locked to achieve preliminary fixation of the terminal shaft 6;

[0065] S5. Tighten the second fastening nut 12 and the two first fastening nuts 10 to strengthen the fixed end shaft 6 position;

[0066] S6. Slide the transition sleeve 7 to connect the terminal shaft 6 and the model connecting support rod 8, tighten the transition sleeve set screw 14, fix the terminal shaft 6 and the model connecting support rod 8 together, and the assembly is completed.

[0067] The present invention effectively solves the problem of spatial angle and displacement deviation of the connection between the model and the bracket interfering with the auxiliary measuring mechanism, ensures the accuracy of the connection between the two, and helps to improve the accuracy of the high angle of attack test; the transition sleeve and the terminal shaft and the model connecting support rod are connected through clearance fit and corresponding fastening methods, so that the entire device is easy to operate during the adjustment process, which helps to improve the test efficiency.

[0068] The present invention can effectively prevent the impact of vibration on components during high angle of attack tests, avoid the risk of structural damage due to vibration, improve the stability of the device structure as a whole, and ensure that the test can be carried out smoothly.

[0069] Although the present invention has been described according to a limited number of embodiments, it will be apparent to those skilled in the art, with the benefit of the above description, that other embodiments may be envisioned within the scope of the invention thus described. In addition, it should be noted that the language used in this specification is selected primarily for readability and teaching purposes, rather than for explaining or defining the subject matter of the present invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is illustrative, not restrictive, with respect to the scope of the present invention, which is defined by the appended claims.

Claims

1. An open large angle of attack bracket interference five-degree-of-freedom test adjustment device, characterized in that: The invention comprises a bracket (1) and a bracket interference auxiliary measurement mechanism, wherein the bracket interference auxiliary measurement mechanism comprises a support (2), an X-axis movable adjustment bolt (3), a Y-axis movable adjustment bolt (4), an X-axis rotation adjustment rod (5), an end shaft (6), a transition sleeve (7), a model connecting support rod (8), a spherical bearing seat (13), an X-axis movable adjustment support (15), a Y-axis movable adjustment support (16), a spherical bearing (17), a Y-axis rotation adjustment rod (18), a third shaped sleeve (22), a first support (24), a second support (25), a third support (26), and a fourth support (27); Brackets (1) are symmetrically arranged on the left and right sides of the support (2), and the brackets (1) are connected to the high angle of attack device; A Y-axis movable adjustment support (16) is slidably mounted on the rear side of the support (2) in a vertical direction, an X-axis movable adjustment support (15) is slidably mounted on the front side of the Y-axis movable adjustment support (16) in a horizontal direction, two X-axis movable adjustment bolts (3) pass through the left and right side plates of the support (2) and are connected to the X-axis movable adjustment support (15), and two Y-axis movable adjustment bolts (4) pass through the upper and lower side plates of the support (2) and are connected to the Y-axis movable adjustment support (16); The front side surface of the X-axis movable adjustment support (15) is fixedly connected to the spherical bearing seat (13), and a spherical bearing (17) is provided inside the spherical bearing seat (13); One end of the terminal shaft (6) is fixedly connected to the spherical bearing (17) via a shaft end retaining ring, and the other end is connected to the model connecting support rod (8) via a transition sleeve (7); The spherical bearing seat (13) is provided with a first support column (24) and a second support column (25), and the rear ends of the X-axis rotation adjustment rod (5) and the Y-axis rotation adjustment rod (18) are connected to the first support column (24) and the second support column (25); The end shaft (6) is sleeved with a third rectangular sleeve (22), the third rectangular sleeve (22) is provided with a third support (26) and a fourth support (27), and the front ends of the X-axis rotation adjustment rod (5) and the Y-axis rotation adjustment rod (18) are connected to the third support (26) and the fourth support (27); The X-axis rotation adjustment rod (5) and the Y-axis rotation adjustment rod (18) are distributed at an angle of 90 degrees; The terminal shaft (6) is connected to the lower side plate of the support (2) via a fastening connection portion.

2. According to claim 1, a five-degree-of-freedom test adjustment device for interference of an opening large angle-of-attack bracket, characterized in that: The fastening connection portion comprises a large washer (9), a first fastening nut (10), a fastener (11) and a second fastening nut (12); the fastener (11) comprises a first square sleeve (19) and a first stud (20); The lower end of the first stud (20) passes through the hole of the lower side plate of the support (2), and is connected to the support (2) through a large gasket (9) and a first fastening nut (10), and the upper end of the first stud (20) is connected to the side of the first square sleeve (19); The terminal shaft (6) is sleeved with a second square sleeve (21), a second stud (23) is provided on the left side of the second square sleeve (21), the left end of the second stud (23) passes through the first square sleeve (19) and is connected to the second fastening nut (12), and the relative position of the support (2) and the terminal shaft (6) is fixed by locking the first fastening nut (10) and the second fastening nut (12).

3. According to claim 2, a five-degree-of-freedom test adjustment device for interference of an opening large angle-of-attack bracket, characterized in that: The hole positions of the lower side plate of the support (2) meet the requirements for the fastener (11) to move in response to the displacement of the terminal shaft (6).

4. According to claim 1, a five-degree-of-freedom test adjustment device for interference of an opening large angle-of-attack bracket, characterized in that: Limit blocks are provided on both sides of the X-axis movable adjustment support (15) and the Y-axis movable adjustment support (16).

5. According to claim 1, the five-degree-of-freedom test adjustment device for interference of an opening large angle-of-attack bracket is characterized in that: The portion where the terminal shaft (6) and the model connecting support rod (8) are inserted into the transition sleeve (7) is knurled.

6. According to claim 5, a five-degree-of-freedom test adjustment device for interference of an opening large angle-of-attack bracket is characterized in that: The terminal shaft (6), the transition sleeve (7) and the model connecting support rod (8) are clearance-fitted.

7. According to claim 6, a five-degree-of-freedom test adjustment device for interference of an opening large angle-of-attack bracket, characterized in that: The transition sleeve (7) is provided with a transition sleeve fixing screw (14) to fix the relative positions of the transition sleeve (7), the terminal shaft (6) and the model connecting support rod (8).

8. According to claim 1, the five-degree-of-freedom test adjustment device for interference of an opening large angle-of-attack bracket is characterized in that: The X-axis rotation adjustment rod (5) and the Y-axis rotation adjustment rod (18) are composed of a fisheye ball bearing and a double-headed reverse thread stud, the front end of the double-headed reverse thread stud is connected to the end shaft (6) through the fisheye ball bearing, and the rear end of the double-headed reverse thread stud is connected to the spherical bearing seat (13) through the fisheye ball bearing.

9. A five-degree-of-freedom test adjustment method for an open large angle-of-attack bracket, characterized in that: The specific steps include: S1. Loosen the first fastening nut (10), the second fastening nut (12), the X-axis movement adjustment bolt (3), the Y-axis movement adjustment bolt (4), and the transition sleeve set screw (14); S2. Adjust the displacement of the terminal shaft (6) in the Y-axis direction by adjusting the two Y-axis movable adjustment bolts (4). After adjusting to the appropriate position, tighten the two Y-axis movable adjustment bolts (4) to each other to lock the Y-axis position of the terminal shaft (6); S3. Adjust the displacement of the terminal shaft (6) in the X-axis direction by adjusting the two X-axis movable adjustment bolts (3). After adjusting to the appropriate position, tighten the two X-axis movable adjustment bolts (3) to each other to lock the X-axis position of the terminal shaft (6); S4. The rotation angle of the terminal shaft (6) on the X-axis is adjusted by adjusting the X-axis rotation adjustment rod (5), and the rotation angle of the terminal shaft (6) on the Y-axis is adjusted by adjusting the Y-axis rotation adjustment rod (18). After adjusting to a position where the terminal shaft (6) can be smoothly connected to the model connecting rod (8), the X-axis rotation adjustment rod (5) and the Y-axis rotation adjustment rod (18) are self-locked to achieve preliminary fixation of the terminal shaft (6); S5. Tighten the second fastening nut (12) and the two first fastening nuts (10) to strengthen the fixed position of the end shaft (6); S6. Slide the transition sleeve (7) to connect the end shaft (6) and the model connecting rod (8), tighten the transition sleeve set screw (14), fix the end shaft (6) and the model connecting rod (8) together, and the assembly is completed.

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