Transmission assembly and long-distance multi-stage telescopic transmission mechanism thereof

Abstract

The utility model discloses a transmission assembly and a long-distance multi-stage telescopic transmission mechanism thereof, and relates to the technical field of telescopic transmission, the long-distance multi-stage telescopic transmission mechanism comprises a multi-stage telescopic arm comprising a first telescopic arm, a second telescopic arm and a third telescopic arm which are connected in sequence, at least one second telescopic arm is arranged between the first telescopic arm and the third telescopic arm, the multi-stage sleeve comprises a first sleeve, a second sleeve and a third sleeve which are connected in sequence, the first sleeve is arranged below the first telescopic arm through a bearing seat, the second sleeve is arranged below the second telescopic arm through a bearing seat, and the third sleeve is arranged below the first telescopic arm through a bearing seat. The third sleeve is arranged below the third telescopic arm through a bearing seat; the transmission device is arranged below the first sleeve and used for driving the first sleeve to rotate so as to drive the second sleeve and the third sleeve to rotate; the connector is arranged at the front end of the third sleeve and used for being connected with a cutting mechanism. According to the device, remote multi-stage telescopic transmission can be realized, and remote accurate transmission is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of telescopic transmission, and more specifically, to a long-distance multi-stage telescopic transmission mechanism. In addition, it also relates to a transmission assembly including the long-distance multi-stage telescopic transmission mechanism. Background Art

[0002] Existing telescopic-arm hydraulic sandblasting cutting devices are used to hydraulically cut burning wellhead equipment in the event of a fire in an oil and gas field. A single cutting operation typically takes more than 30 minutes. According to previous monitoring data, temperatures within a 2-meter diameter area of ​​the wellhead exceed 1200°C, and ambient temperatures within 5 meters of the wellhead exceed 600°C. To minimize the impact of high wellhead flame temperatures on the hydraulic sandblasting cutting device, the device's working arm is designed to be retractable in multiple stages. When extended, the front cutting head reaches the wellhead, placing the main body of the hydraulic sandblasting cutting device more than 20 meters from the wellhead. To ensure stable cutting operation, the main body of the hydraulic sandblasting cutting device and the working arm remain stationary during cutting, with only the cutting head moving forward and backward. However, most existing telescopic transmission structures only feature a single stage of retraction, resulting in a short retraction distance for the cutting head. To minimize the thermal impact of high wellhead temperatures on the power input motor that powers the cutting head's retraction, the motor is mounted at the rear end of the working arm, 20 meters from the wellhead. This ensures stable transmission of the motor's rotational motion to the front motion conversion device (i.e., the cutting head).

[0003] In summary, how to provide a mechanism that can achieve long-distance multi-stage telescopic transmission and long-distance precise transmission is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a long-distance multi-stage telescopic transmission mechanism, which can realize long-distance multi-stage telescopic transmission and long-distance precise transmission.

[0005] Another object of the present invention is to provide a transmission assembly including the above-mentioned long-distance multi-stage telescopic transmission mechanism.

[0006] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0007] A long-distance multi-stage telescopic transmission mechanism, comprising:

[0008] A multi-stage telescopic arm comprises a first telescopic arm, a second telescopic arm and a third telescopic arm connected in sequence, wherein at least one second telescopic arm is provided between the first telescopic arm and the third telescopic arm.

[0009] A multi-stage sleeve, comprising a first sleeve, a second sleeve, and a third sleeve connected in sequence, wherein the first sleeve is disposed below the first telescopic arm via a bearing seat, the second sleeve is disposed below the second telescopic arm via a bearing seat, and the third sleeve is disposed below the third telescopic arm via a bearing seat, and the multi-stage sleeve is configured to synchronously extend and retract with the multi-stage telescopic arm;

[0010] a transmission device, which is provided below the first sleeve and is used to drive the first sleeve to rotate, thereby driving the second sleeve and the third sleeve to rotate;

[0011] A connector is provided at the front end of the third sleeve, and the connector is used to connect with the cutting mechanism.

[0012] In one embodiment, the transmission device includes a motor, a reducer connected to the motor, and a transmission gear. The transmission gear is sleeved on the outer periphery of the output shaft of the reducer. The rear end of the first sleeve is provided with an external gear, and the external gear is used to engage with the transmission gear.

[0013] In one embodiment, at least two fixing sleeves are provided on the first sleeve at intervals, and each fixing sleeve is used for being assembled and connected with the bearing seat, so that the first sleeve can be rotatably provided under the first telescopic arm.

[0014] In one embodiment, the rear end of the second sleeve is inserted into the first sleeve, and the front end of the second sleeve is provided with a fixing sleeve, and the fixing sleeve is fixed below the front end of the second telescopic arm through the bearing seat.

[0015] In one embodiment, the rear end of the third sleeve is inserted into the second sleeve, and the front end of the third sleeve is provided with a fixing sleeve, and the fixing sleeve is fixed below the front end of the third telescopic arm through the bearing seat.

[0016] In one embodiment, the connector includes a connecting shaft and a universal coupling provided at the front end of the third sleeve, and the end of the connecting shaft is connected to the cutting mechanism through the universal coupling.

[0017] In one embodiment, the first sleeve, the second sleeve, and the third sleeve are all hexagonal steel tubes.

[0018] In one embodiment, the first sleeve, the second sleeve and the third sleeve are all round steel pipes provided with key bars, and the first sleeve and the second sleeve are provided with accommodating grooves for accommodating the key bars so as to recycle the second sleeve and the third sleeve.

[0019] A transmission assembly comprises any one of the long-distance multi-stage telescopic transmission mechanisms described above.

[0020] When using the long-distance multi-stage telescopic transmission mechanism provided by the present invention, when the multi-stage telescopic arm is extended, the multi-stage sleeves can be extended. That is, when the second telescopic arm is extended relative to the first telescopic arm, and the third telescopic arm is extended relative to the second telescopic arm, the second sleeve can be extended relative to the first sleeve, and the third sleeve can be extended relative to the second sleeve. When the second and third sleeves are fully extended, the front ends of the sleeves except the first sleeve can be fixed below the front ends of the corresponding telescopic arms via bearing seats. The rear ends of each sleeve overlap the previous sleeve, and the middle of the sleeve is suspended. This ensures the rigidity of the multiple sleeves after extension, ensures that the multiple intermediate sleeves will not bend due to sagging due to gravity, and ensures smooth extension and retraction of each sleeve.

[0021] Furthermore, because each sleeve is positioned beneath each telescopic arm via a bearing block, when the transmission device operates to drive the first sleeve to rotate, the torque can be accurately controlled. Simultaneously, the torque of the first sleeve can be transmitted to the second and third sleeves, and the bearing block does not hinder the rotation of the sleeves. This ensures reliable rotational transmission of the multi-stage sleeves, preventing slippage and failure. Once the transmission device's torque is transmitted to the connector via the first, second, and third sleeves, the connector can drive the cutting mechanism to rotate, enabling remote hydraulic cutting operations.

[0022] In summary, the long-distance multi-stage telescopic transmission mechanism provided by the present invention can realize long-distance multi-stage telescopic transmission and long-distance precise transmission.

[0023] In addition, the utility model also provides a transmission assembly including the above-mentioned long-distance multi-stage telescopic transmission mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] Figure 1 This is a schematic structural diagram of the long-distance multi-stage telescopic transmission mechanism provided by the present invention when it is retracted;

[0026] Figure 2 for Figure 1 Side view of;

[0027] Figure 3 for Figure 2 Cross-section at AA in the middle;

[0028] Figure 4It is a structural diagram of the long-distance multi-stage telescopic transmission mechanism when extended;

[0029] Figure 5 Schematic diagram of the cross section of a multi-stage casing.

[0030] Reference numerals:

[0031] 1-Multi-stage telescopic arm; 11-First telescopic arm; 12-Second telescopic arm; 13-Third telescopic arm; 2-Multi-stage casing; 21-First casing; 22-Second casing; 23-Third casing; 3-Transmission device; 31-Motor; 32-Reducer; 33-Transmission gear; 4-Connector; 5-Bearing seat. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] The core of the present invention is to provide a long-distance multi-stage telescopic transmission mechanism, which can realize long-distance multi-stage telescopic transmission and long-distance precise transmission. Another core of the present invention is to provide a transmission assembly including the long-distance multi-stage telescopic transmission mechanism.

[0034] Please refer to Figures 1 to 5 , Figure 1 This is a schematic structural diagram of the long-distance multi-stage telescopic transmission mechanism provided by the present invention when it is retracted; Figure 2 for Figure 1 Side view of; Figure 3 for Figure 2 Cross-section at AA in the middle; Figure 4 It is a structural diagram of the long-distance multi-stage telescopic transmission mechanism when extended; Figure 5 Schematic diagram of the cross section of a multi-stage casing.

[0035] This specific embodiment provides a long-distance multi-stage telescopic transmission mechanism, comprising:

[0036] The multi-stage telescopic arm 1 comprises a first telescopic arm 11, a second telescopic arm 12 and a third telescopic arm 13 connected in sequence, wherein at least one second telescopic arm 12 is provided between the first telescopic arm 11 and the third telescopic arm 13.

[0037] The multi-stage casing 2 includes a first casing 21, a second casing 22, and a third casing 23 connected in sequence. The first casing 21 is disposed below the first telescopic arm 11 through a bearing seat 5, the second casing 22 is disposed below the second telescopic arm 12 through a bearing seat 5, and the third casing 23 is disposed below the third telescopic arm 13 through a bearing seat 5. The multi-stage casing 2 is used to synchronously extend and retract with the multi-stage telescopic arm 1;

[0038] The transmission device 3 is provided below the first sleeve 21 and is used to drive the first sleeve 21 to rotate, thereby driving the second sleeve 22 and the third sleeve 23 to rotate;

[0039] The connector 4 is provided at the front end of the third sleeve 23 and is used for connecting with the cutting mechanism.

[0040] It should be noted that the multi-stage casing 2 is disposed below the multi-stage telescopic arm 1 and is capable of synchronous telescopic movement with the multi-stage telescopic arm 1, and the synchronous telescopic movement process is smooth. The multi-stage telescopic arm 1 includes at least three telescopic arms, which can drive the multi-stage casing 2 of at least three casings to achieve long-distance transmission, resulting in a total transmission distance of more than 20 meters, with a span of more than 6 meters per stage (for example, the length of the second telescopic arm 12 or the second casing 22 is 6 meters). When the multi-stage telescopic arm 1 is extended, the multi-stage casing 2 extends accordingly. The power input device required for the cutting mechanism, the transmission device 3 (for example, the motor 31), is installed at the rear end of the multi-stage telescopic arm 1, away from the high-temperature zone at the wellhead. Through the long-distance multi-stage telescopic mechanism, the power input is stably and effectively transmitted to the cutting mechanism at the front end of the multi-stage telescopic arm 1, reducing the high temperature impact of the transmission device 3 for continuous cutting and making the operation possible.

[0041] During actual use, the shape, structure, size, material, type, etc. of the multi-stage telescopic arm 1, the multi-stage sleeve 2, the transmission device 3 and the connector 4 can be determined according to actual conditions and actual needs.

[0042] When using the long-distance multi-stage telescopic transmission mechanism provided by the present invention, when the multi-stage telescopic arm 1 is extended, the multi-stage sleeve 2 can be extended. That is, when the second telescopic arm 12 is extended relative to the first telescopic arm 11 and the third telescopic arm 13 is extended relative to the second telescopic arm 12, the second sleeve 22 can be extended relative to the first sleeve 21 and the third sleeve 23 can be extended relative to the second sleeve 22. When the second sleeve 22 and the third sleeve 23 are fully extended, the front ends of the sleeves except the first sleeve 21 can be fixed below the front end of the corresponding telescopic arm through the bearing seat 5. The rear end of each sleeve overlaps the previous sleeve, and the middle of the sleeve is suspended. This ensures the rigidity of the multiple sleeves after extension, ensures that the multiple intermediate sleeves will not bend due to sagging due to gravity, and ensures smooth extension and retraction of each sleeve.

[0043] Furthermore, because each sleeve is positioned beneath each telescopic arm via a bearing block 5, when the transmission device 3 operates to drive the first sleeve 21 to rotate, the torque can be accurately controlled. Simultaneously, the torque of the first sleeve 21 is transmitted to the second and third sleeves 22, 23, and the bearing block 5 does not hinder the rotation of the sleeves. This ensures reliable rotational transmission of the multi-stage sleeves 2, preventing slippage and failure. Once the torque of the transmission device 3 is transmitted to the connector 4 via the first, second, and third sleeves 21, 22, 23, the connector 4 can drive the cutting mechanism to rotate, enabling remote hydraulic cutting operations.

[0044] In summary, the long-distance multi-stage telescopic transmission mechanism provided by the present invention can realize long-distance multi-stage telescopic transmission and long-distance precise transmission.

[0045] In one embodiment, the transmission device 3 includes a motor 31, a reducer 32 connected to the motor 31, and a transmission gear 33. The transmission gear 33 is sleeved on the outer periphery of the output shaft of the reducer 32. The rear end of the first sleeve 21 is provided with an external gear, which is used to mesh with the transmission gear 33. The structure is as follows Figure 3 By controlling the operation of the motor 31, the output shaft of the motor 31 can be driven to rotate, and the reducer 32 can reduce the rotation of the output shaft so that the output shaft rotates at a set speed, thereby driving the transmission gear 33 to rotate, inputting the power torque required for cutting by the cutting mechanism into the multi-stage casing 2, and finally driving the cutting mechanism to rotate to perform the cutting operation.

[0046] In one embodiment, at least two fixed sleeves are spaced apart on the first sleeve 21, each of which is used to be assembled and connected to the bearing seat 5, so that the first sleeve 21 is rotatably disposed below the first telescopic arm 11. In other words, a bearing seat 5 can be provided below the multi-stage telescopic arm 1, and the multi-stage sleeve 2 is then inserted into the bearing seat 5, so that the fixed sleeves are embedded in the bearing seat 5. This not only fixes the multi-stage sleeve 2 below the multi-stage telescopic arm 1, allowing the multi-stage sleeve 2 to synchronously extend and retract when the multi-stage telescopic arm 1 is extended and retracted, but also allows the multi-stage sleeve 2 to rotate smoothly under the drive of the transmission device 3 to transmit the required torque to the cutting mechanism.

[0047] Since the transmission device 3 needs to be installed on the first sleeve 21 and the first sleeve 21 is arranged below the first telescopic arm 11 (the relatively fixed basic arm), in order to ensure the structural stability of the device, multiple fixing sleeves can be provided on the first sleeve 21 to prevent the middle part of the first sleeve 21 from hanging and falling, thereby affecting the use of the transmission device 3.

[0048] In one embodiment, the rear end of the second sleeve 22 is inserted into the first sleeve 21. The front end of the second sleeve 22 is provided with a fixing sleeve, which is fixed below the front end of the second telescopic arm 12 via a bearing seat 5. Because the second sleeve 22 needs to follow the telescopic movement of the second telescopic arm 12, the fixing sleeve is only provided at the front end of the second sleeve 22 to ensure that the front end of the second sleeve 22 moves synchronously with the front end of the second telescopic arm 12. The rear end of the second sleeve 22 can be fully inserted into the first sleeve 21, and the inner periphery of the front end of the first sleeve 21 is provided with a structure that engages with the rear end of the second sleeve 22 to prevent the second sleeve 22 from detaching when fully extended relative to the first sleeve 21.

[0049] In one embodiment, the rear end of the third sleeve 23 is inserted into the second sleeve 22. The front end of the third sleeve 23 is provided with a fixing sleeve, which is fixed below the front end of the third telescopic arm 13 via a bearing seat 5. Because the third sleeve 23 needs to follow the telescopic movement of the third telescopic arm 13, the fixing sleeve is only provided at the front end of the third sleeve 23 to ensure that the front end of the third sleeve 23 moves synchronously with the front end of the third telescopic arm 13. The rear end of the third sleeve 23 can be fully inserted into the second sleeve 22, and the inner circumference of the front end of the second sleeve 22 is provided with a structure that engages with the rear end of the third sleeve 23 to prevent the third sleeve 23 from detaching when fully extended from the second sleeve 22.

[0050] In one embodiment, the connector 4 includes a connecting shaft and a universal coupling located at the front end of the third sleeve 23. The end of the connecting shaft is connected to the cutting mechanism via the universal coupling. Specifically, the connecting shaft can be welded to the front end of the third sleeve 23, and the connecting shaft is connected to the cutting mechanism at the front end of the device via a retractable universal coupling.

[0051] In one embodiment, the first sleeve 21, the second sleeve 22 and the third sleeve 23 are all hexagonal steel tubes, and the structure is as follows: Figure 5 shown.

[0052] It should be noted that when the multi-stage telescopic arm 1 is extended, the corresponding multi-stage sleeve 2 can be extended. When the second sleeve 22 and the third sleeve 23 are fully extended, the front end of the sleeves other than the first sleeve 21 is fixed to the lower front end of the corresponding telescopic arm through the bearing seat 5, and the rear end of the sleeve overlaps the previous sleeve for a section, and the middle of the telescopic sleeve is suspended. Because the sleeve is made of hexagonal steel pipe, the rigidity of the sleeve can be effectively guaranteed, while the weight of the sleeve can be reduced, ensuring that the suspended middle section of the sleeve will not bend due to sagging due to gravity. Moreover, a large gap is reserved between the hexagonal steel pipes, which can reduce the precision requirements of processing and reduce costs. At the same time, it ensures that the multi-stage sleeve 2 can be smoothly extended and retracted, and the rotation transmission of the hexagonal steel pipes is reliable, without the phenomenon of slippage failure between them.

[0053] In the present application, the first sleeve 21 is a fixed tube, to which three fixed sleeves are welded and fixed below the first telescopic arm 11 via a bearing seat 5. An external gear is assembled at the rear end of the first sleeve 21 to mesh with the transmission gear 33. The tail end of the second sleeve 22 is fully inserted into the fixed first sleeve 21. A fixed sleeve is welded to the front end of the second sleeve 22 and fixed below the front end of the second telescopic arm 12 via a bearing seat 5. The tail end of the third sleeve 23 is fully inserted into the second sleeve 22. A fixed sleeve is welded to the front end of the third sleeve 23 and fixed below the front end of the third telescopic arm 13 via a bearing seat 5. A connecting shaft is welded to the front end of the third sleeve 23 and connected to the cutting mechanism at the front end of the device via a retractable universal joint. Furthermore, the number of telescopic stages of this device can be increased according to actual needs to achieve transmission over longer distances. This device can stably transmit torque with high torque transmission efficiency.

[0054] In one embodiment, the first, second, and third sleeves 21, 22, and 23 are all round steel tubes with keyed strips. Each of the first and second sleeves 21, 22 is provided with a slot for accommodating the keyed strips, facilitating the recovery of the second and third sleeves 22, 23. In other words, in addition to hexagonal steel tubes, the multi-stage sleeve 2 can also be made of round steel tubes with keyed strips. The material, shape, and dimensions of the multi-stage sleeve 2 can be determined based on actual conditions and needs during actual use.

[0055] In addition to the above-mentioned long-distance multi-stage telescopic transmission mechanism, the present invention also provides a transmission assembly including the long-distance multi-stage telescopic transmission mechanism disclosed in the above-mentioned embodiment. For the structures of other parts of the transmission assembly, please refer to the prior art and will not be described in detail herein.

[0056] It should be noted that the first sleeve 21, the second sleeve 22, the third sleeve 23, the first telescopic arm 11, the second telescopic arm 12, and the third telescopic arm 13 mentioned in the present invention, where the first, second and third are only used to distinguish the different positions, and there is no order of precedence.

[0057] In addition, it should be noted that the orientation or positional relationship indicated by "front and back", "inside and outside", etc. in the present invention is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of simplifying the description and facilitating understanding, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0058] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other. Any combination of all the embodiments provided by this utility model is within the scope of protection of this utility model and will not be described in detail here.

[0059] The above describes in detail the transmission assembly and long-distance multi-stage telescopic transmission mechanism provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core concept of the present invention. It should be noted that for ordinary technicians in this technical field, without departing from the principles of the present invention, various improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A long-distance multi-stage telescopic transmission mechanism, characterized in that: include: A multi-stage telescopic arm (1), comprising a first telescopic arm (11), a second telescopic arm (12), and a third telescopic arm (13) connected in sequence, wherein at least one second telescopic arm (12) is provided between the first telescopic arm (11) and the third telescopic arm (13); A multi-stage sleeve (2), comprising a first sleeve (21), a second sleeve (22), and a third sleeve (23) connected in sequence, wherein the first sleeve (21) is arranged below the first telescopic arm (11) through a bearing seat (5), the second sleeve (22) is arranged below the second telescopic arm (12) through a bearing seat (5), and the third sleeve (23) is arranged below the third telescopic arm (13) through a bearing seat (5), and the multi-stage sleeve (2) is used to synchronously extend and retract following the multi-stage telescopic arm (1); a transmission device (3), which is arranged below the first sleeve (21) and is used to drive the first sleeve (21) to rotate, thereby driving the second sleeve (22) and the third sleeve (23) to rotate; A connector (4) is provided at the front end of the third sleeve (23), and the connector (4) is used to connect to the cutting mechanism.

2. The long-distance multi-stage telescopic transmission mechanism according to claim 1, characterized in that: The transmission device (3) comprises a motor (31), a reducer (32) connected to the motor (31), and a transmission gear (33); the transmission gear (33) is sleeved on the outer periphery of the output shaft of the reducer (32); an external gear is provided at the rear end of the first sleeve (21); the external gear is used to mesh with the transmission gear (33).

3. The long-distance multi-stage telescopic transmission mechanism according to claim 1, characterized in that: At least two fixing sleeves are provided on the first sleeve (21) at intervals, and each fixing sleeve is used to be assembled and connected with the bearing seat (5) so that the first sleeve (21) can be rotatably provided below the first telescopic arm (11).

4. The long-distance multi-stage telescopic transmission mechanism according to claim 3, characterized in that: The rear end of the second sleeve (22) is inserted into the first sleeve (21), and the front end of the second sleeve (22) is provided with a fixing sleeve, which is fixed below the front end of the second telescopic arm (12) through the bearing seat (5).

5. The long-distance multi-stage telescopic transmission mechanism according to claim 4, characterized in that: The rear end of the third sleeve (23) is inserted into the second sleeve (22), and the front end of the third sleeve (23) is provided with a fixing sleeve, which is fixed below the front end of the third telescopic arm (13) through the bearing seat (5).

6. The long-distance multi-stage telescopic transmission mechanism according to claim 5, characterized in that: The connector (4) comprises a connecting shaft and a universal coupling provided at the front end of the third sleeve (23), and the end of the connecting shaft is connected to the cutting mechanism via the universal coupling.

7. The long-distance multi-stage telescopic transmission mechanism according to any one of claims 1 or 6, characterized in that: The first sleeve (21), the second sleeve (22), and the third sleeve (23) are all hexagonal steel tubes.

8. The long-distance multi-stage telescopic transmission mechanism according to any one of claims 1 or 6, characterized in that: The first sleeve (21), the second sleeve (22) and the third sleeve (23) are all round steel tubes provided with key bars, and the first sleeve (21) and the second sleeve (22) are provided with accommodating grooves for accommodating the key bars so as to recycle the second sleeve (22) and the third sleeve (23).

9. A transmission assembly, characterized in that: It comprises the long-distance multi-stage telescopic transmission mechanism described in any one of claims 1 to 8 above.

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