TRT stationary blade adjusting servo actuator

Abstract

The utility model relates to a servo actuator, in particular to a TRT stationary blade adjusting servo actuator, which is characterized in that a guide ring is fixedly mounted in the middle of a piston rod, and a first sealing bush and a second sealing bush are respectively sleeved at two ends of the piston rod; a first cavity is formed among the side wall of the first sealing bush, the outer side wall of the piston rod, the inner wall of the cylinder body and the side wall of the guide ring; a second cavity is formed among the side wall of the second sealing bush, the outer side wall of the piston rod, the inner wall of the cylinder body and the side wall of the guide ring; a first oil way joint and a second oil way joint are arranged on the cylinder body; and one end of the piston rod extends out of the cylinder body and is provided with a universal adjusting hinge lug. The universal adjusting hinge lug is arranged at the end of the piston rod, and the universal adjusting hinge lug is connected with the fan stationary blade connecting rod, so that the problem that the requirement for the installation precision of the servo actuator is too high is effectively solved, deviation loads caused by the installation problem are eliminated, eccentric wear of the piston rod caused by the deviation loads is avoided, and the service life of the piston rod is prolonged. And the problem of oil leakage is solved.

Description

Technical Field

[0001] The utility model relates to a servo actuator, in particular to a TRT stationary blade regulating servo actuator. Background Art

[0002] In the traditional TRT (turbine unit) stator blade adjustment system, the servo actuator plays a vital role. It is responsible for adjusting the angle of the stator blades in the turbine unit, thereby controlling the direction and speed of the airflow to achieve stable operation and high-efficiency output of the unit.

[0003] However, the traditional TRT stator blade adjustment servo actuator has significant design deficiencies, such as: the hinge ear assembly in the traditional TRT stator blade adjustment mechanism actuator is mainly composed of a hinge ear and a spherical bearing. The spherical bearing is installed in the hinge ear hole. Although it can achieve angle adjustment to a certain extent, its maximum axial adjustment angle is only 6°, and the radial angle cannot be adjusted. This design leads to extremely high connection accuracy requirements between the actuator and the fan stator connecting rod, and the phenomenon of misalignment is prone to occur during the installation process. When the actuator is running, this misalignment phenomenon will generate eccentric loads, which will cause eccentric wear of the actuator piston rod, damage the piston rod surface, and then damage the seal, and finally cause oil leakage problems. Utility Model Content

[0004] The utility model aims to solve the technical problem that the existing actuator is prone to produce eccentric load due to the phenomenon of misalignment during operation, resulting in eccentric wear of the actuator piston rod and further causing oil leakage, and provides a TRT stator blade adjustment servo actuator.

[0005] In order to solve the above technical problems, the technical solutions provided by the utility model are as follows:

[0006] A TRT stationary blade adjustment servo actuator comprises a cylinder body and a piston rod slidably mounted inside the cylinder body;

[0007] A guide ring is fixedly installed in the middle of the piston rod, and the outer wall of the guide ring is in contact with the inner wall of the cylinder;

[0008] The two ends of the piston rod are respectively sleeved with a first sealing bushing and a second sealing bushing, and the first sealing bushing and the second sealing bushing are respectively fixedly installed at the two ends of the cylinder body;

[0009] A first cavity is formed between the side wall of the first sealing bushing, the outer side wall of the piston rod, the inner wall of the cylinder body and the side wall of the guide ring; a second cavity is formed between the side wall of the second sealing bushing, the outer side wall of the piston rod, the inner wall of the cylinder body and the side wall of the guide ring;

[0010] The cylinder body is provided with a first oil circuit joint and a second oil circuit joint, the first oil circuit joint is communicated with the first cavity, and the second oil circuit joint is communicated with the second cavity;

[0011] One end of the piston rod extends out of the cylinder body and is provided with a universal adjustment hinge ear, and the other end extends out of the cylinder body and is provided with a displacement monitoring component, and the displacement monitoring component is connected to the end of the cylinder body.

[0012] Furthermore, the universal adjustment hinge ear comprises a ball head connecting rod, a hinge ear and a ball head gland, and the rod portion of the ball head connecting rod is connected to the end of the piston rod;

[0013] A ball head installation groove is provided on one end surface of the hinge ear, and a support pad matching the ball head of the ball head connecting rod is provided in the ball head installation groove;

[0014] The ball head of the ball head connecting rod is placed on the support pad of the ball head mounting groove, and the ball head pressure cover is sleeved on the rod part of the ball head connecting rod and connected with the hinge ear.

[0015] Furthermore, a first annular oil groove and a second annular oil groove are provided on the outer side wall of the first sealing bushing; a third annular oil groove corresponding to the position of the first annular oil groove is provided on the inner side wall of the first sealing bushing;

[0016] The first sealing bushing is provided with a plurality of first oil guide channels located in the first annular oil groove and evenly distributed along the circumference, and a plurality of second oil guide channels located in the second annular oil groove and evenly distributed along the circumference;

[0017] The first annular oil groove is connected to the first oil circuit joint, the first oil guide channel connects the first annular oil groove and the third annular oil groove, and the third annular oil groove is connected to the first cavity;

[0018] Two hole sealing rings distributed on both sides of the second annular oil groove are embedded on the outer side wall of the first sealing bushing;

[0019] A primary sealing group and a secondary sealing group located on both sides of the second oil guide channel are embedded on the inner side wall of the first sealing bushing;

[0020] The primary sealing group includes a primary guide pad embedded inside the first sealing bushing, and primary shaft sealing rings distributed on both sides of the primary guide pad;

[0021] The secondary sealing group includes a secondary shaft sealing ring embedded inside the first sealing bushing, and secondary guide pads distributed on both sides of the secondary shaft sealing ring;

[0022] The second sealing bushing has the same structure as the first sealing bushing, and the two are symmetrically arranged.

[0023] Further, the displacement monitoring assembly includes a sensor bracket and a displacement sensor;

[0024] The displacement sensor is fixedly mounted on the end of the piston rod through a sensor bracket. The end of the piston rod is provided with a measuring rod mounting hole, and the measuring rod of the displacement sensor is mounted in the measuring rod mounting hole.

[0025] The sensor bracket is provided with a through slot;

[0026] An anti-twist connecting rod is arranged in the through groove, the anti-twist connecting rod extends out of the through groove and is connected to an indicator;

[0027] A scale bracket used in conjunction with the indicator is also provided on the outside of the sensor bracket; a travel limit assembly is also provided on the scale bracket.

[0028] Further, the travel limit assembly includes a sliding groove provided on the scale bracket;

[0029] Two slide blocks are arranged in the sliding groove and located on both sides of the indicator, and a limit stopper is arranged on the end surface of the slide block close to the indicator;

[0030] The slide block is fixed in the slide groove by two fixing bolts.

[0031] Furthermore, an oil leakage channel is provided on the side of the cylinder body, and two ends of the oil leakage channel are respectively connected to the second annular oil groove of the first sealing bushing and the second annular oil groove of the second sealing bushing;

[0032] An oil leakage joint connected to the oil leakage channel is arranged on the outer side wall of the cylinder body.

[0033] Furthermore, the cylinder body includes a cylinder body, and a connecting flange and a plug respectively fixedly mounted on both ends of the cylinder body;

[0034] The middle parts of the connecting flange and the plug are both provided with through holes adapted to the piston rod;

[0035] The connecting flange and the plug respectively fix the first sealing bushing and the second sealing bushing on the two ends of the cylinder.

[0036] Furthermore, one end of the piston rod connected to the ball head connecting rod is sleeved with a dust cover, and both ends of the dust cover are respectively connected to the end of the piston rod and the connecting flange.

[0037] Compared with the prior art, the utility model has the following beneficial effects:

[0038] 1. The TRT stator blade adjustment servo actuator provided by the utility model is connected to the fan stator blade connecting rod through a universal adjustment hinge ear provided at the end of the piston rod. Since the adjustment angle of the universal adjustment hinge ear is large, the coaxiality requirement when the piston rod of the servo actuator is connected to the two sides of the fan stator blade can be reduced, which effectively solves the problem of too high installation accuracy requirements of the servo actuator, eliminates the eccentric load caused by the installation problem, and avoids the problem of oil leakage caused by eccentric wear of the piston rod due to the eccentric load.

[0039] 2. The TRT stator blade adjustment servo actuator provided by the utility model is provided with a primary sealing group and a secondary sealing group on the first sealing bushing and the second sealing bushing to solve the oil leakage problem caused by damage to the primary sealing group. At the same time, by providing an oil leakage channel and an oil leakage joint, the hydraulic oil leaked due to damage to the primary sealing group can be discharged to avoid dripping outside the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The structure of the embodiment of the utility model is shown in FIG. Figure 1 ;

[0041] Figure 2 The cross-sectional structure of the embodiment of the utility model is shown in FIG. Figure 1 ;

[0042] Figure 3 for Figure 2 A schematic diagram of the structure enlargement at the center A;

[0043] Figure 4 The structure of the embodiment of the utility model is shown in FIG. Figure 2 ;

[0044] Figure 5 The cross-sectional structure of the embodiment of the utility model is shown in FIG. Figure 2 .

[0045] Description of the accompanying drawings: 1 is a cylinder body, 2 is a piston rod, 3 is a guide ring, 4 is a first sealing bushing, 41 is a first annular oil groove, 42 is a second annular oil groove, 43 is a third annular oil groove, 44 is a first oil guide channel, 45 is a second oil guide channel, 46 is a hole sealing ring, 47 is a primary guide pad, 48 is a primary shaft sealing ring, 49 is a secondary shaft sealing ring, 410 is a secondary guide pad, 5 is a second sealing bushing, 6 is a first cavity, 7 is a second cavity, 8 is a first oil circuit joint, 9 is a second oil circuit joint, 10 is a universal adjustment hinge ear, 101 is a ball head connecting rod, 102 is a hinge ear, 103 is a ball head cover, 104 is a support pad, 11 is a displacement monitoring assembly, 111 is a sensor bracket, 112 is a displacement sensor, 113 is a measuring rod mounting hole, 114 is a measuring rod, 115 is a through slot, 116 is an anti-twist connecting rod, 117 is an indicator, 118 is a scale bracket, 119 is a travel limit assembly, 1191 is a sliding slot, 1192 is a slider, 1193 is a limit stop rod, 1194 is a fixing bolt, 12 is an oil leakage channel, 13 is an oil leakage joint, 14 is a cylinder, 15 is a connecting flange, 16 is a plug, 17 is a dust cover, and 18 is a limit baffle. DETAILED DESCRIPTION

[0046] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] like Figure 1 and Figure 2 As shown, a TRT stator blade adjustment servo actuator comprises a cylinder body 1 and a piston rod 2; the cylinder body 1 comprises a barrel 14, and a connecting flange 15 and a plug 16 respectively fixedly mounted at two ends of the barrel 14; a through hole matching the piston rod 2 is opened in the middle of the connecting flange 15 and the plug 16; the piston rod 2 is slidably mounted in the barrel 14 through the through hole in the middle of the connecting flange 15 and the plug 16, and a guide ring 3 is fixedly mounted in the middle of the piston rod 2, and the outer wall of the guide ring 3 is in contact with the inner wall of the cylinder body 1; in order to enable the piston rod 2 to move normally in the barrel 14 when the servo actuator is in operation, a shaft sealing ring is embedded on the outer wall of the guide ring 3, as well as guide pads distributed on both sides of the shaft sealing ring, so that the guide ring 3 is sealed with the inner wall of the barrel 14, so that the hydraulic oil on both sides of the guide ring 3 will not be conducted, thereby avoiding the problem of low efficiency of the servo actuator due to leakage of hydraulic oil.

[0048] In order to seal the piston rod 2 and the cylinder 14 to prevent the hydraulic oil from leaking, Figure 2As shown, the two ends of the piston rod 2 are respectively sleeved with a first sealing bushing 4 and a second sealing bushing 5. In order to prevent the first sealing bushing 4 and the second sealing bushing 5 from moving with the piston rod 2, the connecting flange 15 and the plug 16 respectively fix the first sealing bushing 4 and the second sealing bushing 5 to the two ends of the cylinder 14.

[0049] like Figure 2 As shown, a first cavity 6 is formed between the side wall of the first sealing bushing 4, the outer side wall of the piston rod 2, the inner wall of the cylinder body 1 and the side wall of the guide ring 3; a second cavity 7 is formed between the side wall of the second sealing bushing 5, the outer side wall of the piston rod 2, the inner wall of the cylinder body 1 and the side wall of the guide ring 3;

[0050] like Figure 2 and Figure 3 As shown, a first annular oil groove 41 and a second annular oil groove 42 are provided on the outer side wall of the first sealing bushing 4; a third annular oil groove 43 corresponding to the position of the first annular oil groove 41 is provided on the inner side wall of the first sealing bushing 4; a plurality of first oil guide channels 44 located in the first annular oil groove 41 and uniformly distributed along the circumference, and a plurality of second oil guide channels 45 located in the second annular oil groove 42 and uniformly distributed along the circumference are provided on the first sealing bushing 4; the first annular oil groove 41 is connected to the first oil circuit joint 8, the first oil guide channel 44 connects the first annular oil groove 41 and the third annular oil groove 43, and the third annular oil groove 43 is connected to the first cavity 6.

[0051] In order to achieve the sealing between the outer wall of the first sealing bushing 4 and the inner wall of the cylinder 14, as shown in FIG. Figure 3 As shown, two hole sealing rings 46 distributed on both sides of the second annular oil groove 42 are embedded on the outer side wall of the first sealing bushing 4.

[0052] In order to achieve the sealing between the piston rod 2 and the first sealing bushing 4, as Figure 3 As shown, a primary sealing group and a secondary sealing group located on both sides of the second oil guide channel 45 are embedded on the inner side wall of the first sealing bushing 4; the primary sealing group is located on the side of the first sealing bushing 4 close to the guide ring 3, and the secondary sealing group is located on the side of the first sealing bushing 4 away from the guide ring 3. The primary sealing group includes a primary guide pad 47 embedded in the inner side of the first sealing bushing 4, and a primary shaft sealing ring 48 distributed on both sides of the primary guide pad 47; the secondary sealing group includes a secondary shaft sealing ring 49 embedded in the inner side of the first sealing bushing 4, and a secondary guide pad 410 distributed on both sides of the secondary shaft sealing ring 49.

[0053] The second sealing bushing 5 has the same structure as the first sealing bushing 4 , and the two are arranged symmetrically.

[0054] In order to improve the servo actuator's ability to withstand eccentric loads, such as Figure 1 , Figure 2 and Figure 4 As shown, one end of the piston rod 2 extends out of the cylinder body 1 and is provided with a universal adjustable hinge ear 10, the universal adjustable hinge ear 10 includes a ball head connecting rod 101, a hinge ear 102 and a ball head pressure cover 103, the rod portion of the ball head connecting rod 101 is connected to the end of the piston rod 2; a ball head mounting groove is opened on one end surface of the hinge ear 102, and a support pad 104 matched with the ball head of the ball head connecting rod 101 is provided in the ball head mounting groove; the ball head of the ball head connecting rod 101 is placed on the support pad 104 of the ball head mounting groove, and the ball head pressure cover 103 is sleeved on the rod portion of the ball head connecting rod 101 and connected to the hinge ear 102.

[0055] In order to prevent the end of the piston rod 2 connected to the universal adjustment hinge ear 10 from contacting external pollutants when extending, causing the piston rod 2 to rust, thereby affecting the sealing performance between the piston rod 2 and the first sealing bushing 4, such as Figure 1 , Figure 2 and Figure 4 As shown, one end of the piston rod 2 connected to the ball head connecting rod 101 is sleeved with a dust cover 17, and both ends of the dust cover 17 are respectively connected to the end of the piston rod 2 and the connecting flange 15.

[0056] In order to monitor the stroke of the servo actuator, Figure 1 and Figure 4 As shown, the other end of the piston rod 2 extends out of the cylinder body 1 and is provided with a displacement monitoring component 11, which includes a sensor bracket 111 and a displacement sensor 112; the displacement sensor 112 is fixedly mounted on the end of the piston rod 2 through the sensor bracket 111, and a measuring rod mounting hole 113 is provided at the end of the piston rod 2, and a measuring rod 114 of the displacement sensor 112 is mounted in the measuring rod mounting hole 113; when the servo actuator is working, the piston rod 2 moves to pull the measuring rod 114 of the displacement sensor 112 to move, and the displacement sensor 112 measures the movement of the piston rod 2 through the movement of the measuring rod 114, thereby completing the monitoring of the stroke of the piston rod 2 of the servo actuator.

[0057] In order to visually monitor the piston rod 2 stroke of the servo actuator, Figure 1 and Figure 4 As shown, a through groove 115 is provided on the sensor bracket 111; an anti-twist connecting rod 116 is provided in the through groove 115, and the anti-twist connecting rod 116 extends to the outside of the through groove 115 and is connected to an indicator 117; a scale bracket 118 used in conjunction with the indicator 117 is also provided on the outside of the sensor bracket 111; when the piston rod 2 of the servo actuator moves, the indicator 117 is driven to move on the scale bracket 118 by the anti-twist connecting rod 116 connected to the piston rod 2, and the stroke of the piston rod 2 can be intuitively monitored by observing the scale lines on the scale bracket 118.

[0058] In order to adjust the stroke of the piston rod 2, Figure 1 and Figure 4 As shown, a travel limit assembly 119 is also provided on the scale bracket 118; the travel limit assembly 119 includes a sliding groove 1191 opened on the scale bracket 118; two sliders 1192 located on both sides of the indicator 117 are provided in the sliding groove 1191, and a limit stop rod 1193 is provided on the end surface of the slider 1192 close to the indicator 117; the slider 1192 is fixed in the sliding groove 1191 by two fixing bolts 1194; by adjusting the position of the slider 1192 in the sliding groove 1191, the limit stop rod 1193 can limit the movement of the indicator 117 at an appropriate position, thereby further achieving the purpose of adjusting the stroke of the piston rod 2.

[0059] At the same time, in order to avoid the problem of overtravel of the piston rod 2 during the movement, as shown in FIG. Figure 2 and Figure 4 As shown, a limit baffle 18 is installed at one end of the cylinder 14 close to the sensor bracket 111 to prevent the guide ring 3 of the piston rod 2 from squeezing the plug 16 and the second sealing bushing 5 out of the cylinder 14.

[0060] In order to prevent the hydraulic oil from dripping on the cylinder 14 after the primary seal group is damaged, Figure 5 As shown, an oil leakage channel 12 is opened on the side of the cylinder body 1, and the two ends of the oil leakage channel 12 are respectively connected with the second annular oil groove 42 of the first sealing bushing 4 and the second annular oil groove 42 of the second sealing bushing 5; an oil leakage joint 13 connected with the oil leakage channel 12 is provided on the outer wall of the cylinder body 1; the hydraulic oil leaked from the primary sealing group enters the oil leakage channel 12 through the second oil guide channel 45 and the second annular oil groove 42, and is discharged from the oil leakage joint 13 connected with the oil leakage channel 12.

[0061] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or replacements within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A TRT stator blade adjustment servo actuator, characterized in that: It comprises a cylinder body (1) and a piston rod (2) slidably mounted inside the cylinder body (1); A guide ring (3) is fixedly mounted in the middle of the piston rod (2), and the outer wall of the guide ring (3) is in contact with the inner wall of the cylinder body (1); The two ends of the piston rod (2) are respectively sleeved with a first sealing bushing (4) and a second sealing bushing (5), and the first sealing bushing (4) and the second sealing bushing (5) are respectively fixedly mounted on the two ends of the cylinder body (1); A first cavity (6) is formed between the side wall of the first sealing bushing (4), the outer wall of the piston rod (2), the inner wall of the cylinder body (1) and the side wall of the guide ring (3); a second cavity (7) is formed between the side wall of the second sealing bushing (5), the outer wall of the piston rod (2), the inner wall of the cylinder body (1) and the side wall of the guide ring (3); The cylinder body (1) is provided with a first oil circuit joint (8) and a second oil circuit joint (9), the first oil circuit joint (8) is communicated with the first cavity (6), and the second oil circuit joint (9) is communicated with the second cavity (7); One end of the piston rod (2) extends out of the cylinder body (1) and is provided with a universal adjustment hinge ear (10), and the other end extends out of the cylinder body (1) and is provided with a displacement monitoring component (11), and the displacement monitoring component (11) is connected to the end of the cylinder body (1).

2. The TRT stator blade adjustment servo actuator according to claim 1, characterized in that: The universal adjustable hinge ear (10) comprises a ball head connecting rod (101), a hinge ear (102) and a ball head gland (103), wherein the rod portion of the ball head connecting rod (101) is connected to the end of the piston rod (2); A ball head installation groove is provided on one end surface of the hinge ear (102), and a support pad (104) matching the ball head of the ball head connecting rod (101) is provided in the ball head installation groove; The ball head of the ball head connecting rod (101) is placed on the support pad (104) of the ball head installation groove, and the ball head pressure cover (103) is sleeved on the rod part of the ball head connecting rod (101) and connected to the hinge ear (102).

3. The TRT stator blade adjustment servo actuator according to claim 1, characterized in that: A first annular oil groove (41) and a second annular oil groove (42) are provided on the outer side wall of the first sealing bushing (4); a third annular oil groove (43) corresponding to the position of the first annular oil groove (41) is provided on the inner side wall of the first sealing bushing (4); The first sealing bushing (4) is provided with a plurality of first oil guide channels (44) located in the first annular oil groove (41) and evenly distributed along the circumference, and a plurality of second oil guide channels (45) located in the second annular oil groove (42) and evenly distributed along the circumference; The first annular oil groove (41) is in communication with the first oil circuit joint (8), the first oil guide channel (44) connects the first annular oil groove (41) and the third annular oil groove (43), and the third annular oil groove (43) is in communication with the first cavity (6); Two hole sealing rings (46) are embedded on the outer side wall of the first sealing bushing (4) and are distributed on both sides of the second annular oil groove (42); A primary sealing group and a secondary sealing group located on both sides of the second oil guide channel (45) are embedded on the inner side wall of the first sealing bushing (4); The primary sealing group comprises a primary guide pad (47) embedded inside the first sealing bushing (4), and primary shaft sealing rings (48) distributed on both sides of the primary guide pad (47); The secondary sealing group comprises a secondary shaft sealing ring (49) embedded inside the first sealing bushing (4), and secondary guide pads (410) distributed on both sides of the secondary shaft sealing ring (49); The second sealing bushing (5) has the same structure as the first sealing bushing (4), and the two are arranged symmetrically.

4. The TRT stator blade adjustment servo actuator according to claim 1, characterized in that: The displacement monitoring component (11) comprises a sensor bracket (111) and a displacement sensor (112); The displacement sensor (112) is fixedly mounted on the end of the piston rod (2) via a sensor bracket (111); a measuring rod mounting hole (113) is provided at the end of the piston rod (2); and a measuring rod (114) of the displacement sensor (112) is mounted in the measuring rod mounting hole (113); The sensor bracket (111) is provided with a through slot (115); An anti-twist connecting rod (116) is provided in the through-groove (115), and the anti-twist connecting rod (116) extends out of the through-groove (115) and is connected to an indicator (117); A scale bracket (118) used in conjunction with the indicator (117) is also provided on the outside of the sensor bracket (111); a travel limit assembly (119) is also provided on the scale bracket (118).

5. The TRT stator blade adjustment servo actuator according to claim 4, characterized in that: The travel limit assembly (119) comprises a sliding groove (1191) provided on the scale bracket (118); Two sliding blocks (1192) are arranged in the sliding groove (1191) and are located on both sides of the indicator (117). A limit stopper (1193) is arranged on an end surface of the sliding block (1192) on one side close to the indicator (117). The sliding block (1192) is fixed in the sliding groove (1191) by two fixing bolts (1194).

6. The TRT stator blade adjustment servo actuator according to claim 1, characterized in that: An oil leakage channel (12) is provided on the side of the cylinder body (1), and two ends of the oil leakage channel (12) are respectively connected to the second annular oil groove (42) of the first sealing bushing (4) and the second annular oil groove (42) of the second sealing bushing (5); An oil leakage joint (13) connected to the oil leakage channel (12) is provided on the outer side wall of the cylinder body (1).

7. The TRT stator blade adjustment servo actuator according to claim 1 or 6, characterized in that: The cylinder body (1) comprises a cylinder body (14), and a connecting flange (15) and a plug (16) respectively fixedly mounted on both ends of the cylinder body (14); The middle parts of the connecting flange (15) and the plug (16) are both provided with through holes adapted to the piston rod (2); The connecting flange (15) and the plug (16) respectively fix the first sealing bushing (4) and the second sealing bushing (5) at the two ends of the cylinder (14).

8. The TRT stator blade adjustment servo actuator according to claim 7, characterized in that: One end of the piston rod (2) connected to the ball head connecting rod (101) is sleeved with a dust cover (17), and both ends of the dust cover (17) are respectively connected to the end of the piston rod (2) and the connecting flange (15).

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