Transmission shaft protective cover device with adjustable length and engineering vehicle

Abstract

The utility model discloses a length-adjustable transmission shaft protective cover device and an engineering vehicle. The length-adjustable transmission shaft protective cover device comprises an upper end cover, a lower end cover, a connecting part, an adjusting cover, a fixed cover and a second fixed part, the upper end cover and the lower end cover are butted together to form a cylinder and an annular plate which vertically extends outwards around the periphery of the inner side of the cylinder; the connecting part is used for fixing the upper end cover and the lower end cover which are butted together; the adjusting cover is mounted on a first fixing part positioned on the upper end cover, and the adjusting cover can axially move relative to the upper end cover; the fixed cover is installed on the outer side end face of the lower end cover, and the fixed cover and the adjusting cover form an axially-extending protective cover which wraps the transmission shaft in an extending mode. The second fixing part is installed on the outer side end face of the adjusting cover and fixed to the frame through a fastener. The protective cover is used for protecting a rotating transmission shaft, and the axial length of the protective cover is adjustable, so that the protective cover is suitable for the distance between a generator and a frame on different vehicles.

Description

Technical Field

[0001] The utility model relates to a drive shaft protective cover device with adjustable length, belonging to the technical field of engineering vehicles. Background Art

[0002] During vehicle operation, there is a lot of dust in the surrounding environment and the environmental dust content is high. If no protective measures are taken for the rotating drive shaft and the operation time is long or the opportunities are too many, it is easy to affect the drive shaft. In addition, without a protective cover for the rotating drive shaft, there will also be potential safety hazards to the objects and people within the rotation range. Therefore, effective protective measures should be set for the drive shaft to ensure better protection and prevention during operation and avoid damage to the drive shaft and personal injury. Content of the Utility Model

[0003] In view of the deficiencies of the existing technology, the utility model provides a drive shaft protective cover device with adjustable length, which is used to protect the rotating drive shaft, avoid the harm caused by the rotation of the drive shaft to people during inspection, and at the same time, the axial length of the protective cover is adjustable to adapt to the distance between the generator and the vehicle frame on different vehicles.

[0004] The utility model is realized according to the following technical scheme:

[0005] In the first aspect, the utility model provides a drive shaft protective cover device with adjustable length, including:

[0006] An upper end cover and a lower end cover, which can form a cylinder and an annular plate vertically extending outward around the inner periphery of the cylinder after being butted together. The cylinder wraps the drive shaft connected to the generator, and the annular plate covers the side surface of the generator located around the drive shaft;

[0007] A connecting component for fixing the butted upper and lower end covers together;

[0008] An adjusting cover is installed on the first fixing component located on the upper end cover, and the adjusting cover can axially move relative to the upper end cover, thereby adjusting the axial length of the upper half part of the drive shaft protective cover device;

[0009] A fixed cover is installed on the outer end surface of the lower end cover, and forms an axially extending protective cover with the adjusting cover to extend and wrap the drive shaft;

[0010] A second fixing component is installed on the outer end surface of the adjusting cover, and the second fixing component is fixed to the vehicle frame through fasteners.

[0011] In some embodiments, both the upper end cover and the lower end cover are integrally formed or welded by a vertical semi-circular plate and a semi-cylindrical plate; after the upper and lower semi-cylindrical plates are butted together, they form the cylinder, and after the upper and lower vertical semi-circular plates are butted together, they form the annular plate.

[0012] In some embodiments, the vertical semi-circular plates in the upper end cover and the lower end cover are both perforated plates.

[0013] In some embodiments, the connecting component includes a first connecting component for fixing the upper and lower semi-cylindrical plates and a second connecting component for fixing the upper and lower vertical semi-circular plates.

[0014] In some embodiments, at least one of the second connecting components is provided at the splicing position of the upper and lower vertical semi-circular plates on both sides of the cylinder; the second connecting component includes:

[0015] An upper ear plate with a through hole, which is horizontally fixed at the splicing edge of the upper vertical semi-circular plate;

[0016] A lower ear plate with a through hole, which is horizontally fixed at the splicing edge of the lower vertical semi-circular plate. The upper and lower ear plates can be fitted together, and the upper and lower through holes are coaxially arranged;

[0017] A bolt and a nut. The bolt passes through the upper and lower through holes, and after the bolt is tightened by the nut, the upper and lower vertical semi-circular plates are fixed together.

[0018] In some embodiments, the first connecting component includes at least one connecting component a for axially fixing the upper and lower semi-cylindrical plates and at least one connecting component b for radially fixing the upper and lower semi-cylindrical plates.

[0019] In some embodiments, at least one connecting component a is located at the splicing position of the upper and lower semi-cylindrical plates on one side, and at least one connecting component b is located at the splicing position of the upper and lower semi-cylindrical plates on the other side;

[0020] The connecting component a includes:

[0021] A front ear plate with a through hole, which is longitudinally fixed at the splicing edge of the upper semi-cylindrical plate;

[0022] A rear ear plate with a through hole, which is longitudinally fixed at the splicing edge of the lower semi-cylindrical plate. The front and rear ear plates can be fitted together, and the front and rear through holes are coaxially arranged;

[0023] A bolt and a nut. The bolt passes through the front and rear through holes, and after the bolt is tightened by the nut, the upper and lower semi-cylindrical plates are fixed together;

[0024] The connecting component b includes:

[0025] The upper ear plate with a through hole is horizontally fixed at the splicing edge of the upper semi-cylindrical plate.

[0026] The lower ear plate with a through hole is horizontally fixed at the splicing edge of the lower semi-cylindrical plate. The upper and lower ear plates can be attached together, and the upper and lower through holes are coaxially arranged.

[0027] Bolts and nuts. The bolts pass through the upper and lower through holes, and after tightening the bolts with nuts, the upper and lower semi-cylindrical plates are fixed together.

[0028] In some embodiments, the first fixing member is a first connecting seat vertically extending outwardly perpendicular to the outer periphery of the semi-cylindrical plate of the upper end cover. The first connecting seat is provided with through holes evenly distributed along its circumferential direction; the adjusting cover includes:

[0029] The upper semi-cylindrical plate, the front half of which can be inserted into the semi-cylindrical plate of the upper end cover.

[0030] The semi-circular ring plate is fixed in the middle of the upper semi-cylindrical plate.

[0031] A plurality of threaded rods are fixed on the side of the semi-circular ring plate facing the first connecting seat, and one threaded rod is aligned with one through hole, and all the threaded rods are inserted into the corresponding through holes.

[0032] A plurality of springs are respectively sleeved on the threaded rods located between the first connecting seat and the semi-circular ring plate.

[0033] A plurality of nuts are respectively screwed onto the threaded rods for fixing the moved upper semi-cylindrical plate on the first connecting seat.

[0034] In some embodiments, the second fixing member is a second connecting seat vertically extending outwardly perpendicular to the outer periphery of the upper semi-cylindrical plate. The second connecting seat is provided with through holes evenly distributed along its circumferential direction; the fasteners are a plurality of bolts, and one bolt passes through one through hole.

[0035] In some embodiments, the fixed cover is a lower semi-cylindrical plate horizontally extending outwardly perpendicular to the outer periphery of the semi-cylindrical plate of the lower end cover.

[0036] In a second aspect, the present invention provides an engineering vehicle, including the adjustable-length drive shaft protection cover device described above.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] The adjustable-length drive shaft protective cover device provided by the present utility model is used to protect the rotating drive shaft, cover the generator at the same time, prevent foreign objects from entering the generator, and avoid the harm caused by the rotating drive shaft to people. The upper end cover and the lower end cover are of a split assembly structure, which is convenient for installation and disassembly. The upper end cover and the lower end cover are provided with openings, which can ensure the ventilation of the generator and observe the working conditions inside the generator and the drive shaft at the same time. The axial length of the protective cover is adjustable to adapt to the distance between the generator and the vehicle frame on different vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings, as a part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model, but do not constitute an improper limitation to the present utility model. Obviously, the drawings described below are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0040] In the drawings:

[0041] Figure 1 is an assembly schematic diagram of the adjustable-length drive shaft protective cover device of the present utility model;

[0042] Figure 2 is an axonometric schematic diagram of the adjustable-length drive shaft protective cover device of the present utility model;

[0043] Figure 3 is a side view schematic diagram of the adjustable-length drive shaft protective cover device of the present utility model;

[0044] Figure 4 is a partial schematic diagram of the adjustable-length drive shaft protective cover device of the present utility model Figure 1 (excluding the adjustment cover, the fixed cover and the second fixing member);

[0045] Figure 5 is a partial schematic diagram of the adjustable-length drive shaft protective cover device of the present utility model Figure 2 (excluding the adjustment cover, the fixed cover and the second fixing member);

[0046] Figure 6 is a partial schematic diagram of the adjustable-length drive shaft protective cover device of the present utility model Figure 3 (excluding the adjustment cover, the fixed cover and the second fixing member);

[0047] Figure 7 is a partial schematic diagram of the adjustable-length drive shaft protective cover device of the present utility model Figure 4 (excluding the adjustment cover, the fixed cover and the second fixing member);

[0048] Figure 8 Isometric view of the upper end cover of the present utility model;

[0049] Figure 9 Isometric view of the assembly of the upper end cover, connecting component and first fixing component of the present utility model Figure 1 ;

[0050] Figure 10 Isometric view of the assembly of the upper end cover, connecting component and first fixing component of the present utility model Figure 2 ;

[0051] Figure 11 Isometric view of the assembly of the upper end cover, connecting component and first fixing component of the present utility model Figure 3 .

[0052] Reference numerals in the drawings: 1 - upper end cover, 2 - vertical semi-circular plate, 3 - second connecting component, 4 - lower end cover, 5 - first fixing component, 6 - connecting component, 7 - first connecting component, 8 - semi-cylindrical plate, 9 - connecting component a, 10 - connecting component b, 11 - fan-shaped hole, 12 - bolt, 13 - upper ear plate, 14 - front ear plate, 15 - upper ear plate, 16 - bolt, 17 - nut, 18 - adjusting cover, 19 - fixing cover, 20 - upper semi-cylindrical plate, 21 - semi-circular ring plate, 22 - threaded rod, 23 - spring, 24 - nut, 25 - second fixing component, 26 - bolt, 100 - generator, 200 - transmission shaft.

[0053] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present utility model in any way, but rather to illustrate the concept of the present utility model to those skilled in the art by reference to specific embodiments. Detailed implementation manners

[0054] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0055] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0056] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0057] As Figure 1 , Figure 2 , Figure 3 shown, an adjustable-length drive shaft protective cover device includes an upper end cover 1, a lower end cover 4, a connecting component, an adjusting cover 18, a fixed cover 19, and a second fixing component 25; after the upper end cover 1 and the lower end cover 4 are butted together, they can form a cylinder and an annular plate vertically extending outward around the inner periphery of the cylinder. The cylinder wraps the drive shaft 200 connected to the generator 100, and the annular plate covers the side surface of the generator 100 located around the drive shaft 200; the connecting component is used to fix the butted upper and lower end covers 1 and 4 together; the adjusting cover 18 is installed on the first fixing component 5 located on the upper end cover 1, and the adjusting cover 18 can axially move relative to the upper end cover 1, thereby adjusting the axial length of the upper half of the drive shaft protective cover device; the fixed cover 19 is installed on the outer end surface of the lower end cover 4 and forms an axially extending protective cover with the adjusting cover 18 to extend and wrap the drive shaft 200; the second fixing component 25 is installed on the outer end surface of the adjusting cover 18, and the second fixing component 25 is fixed to the vehicle frame by fasteners.

[0058] The above upper end cover and lower end cover are further described below.

[0059] As Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 shown, both the upper end cover 1 and the lower end cover 4 are integrally formed or welded by vertical semi-circular plates 2 and semi-cylindrical plates 8; the upper and lower semi-cylindrical plates 8 are butted together to form a cylinder, and the upper and lower vertical semi-circular plates 2 are butted together to form an annular plate. Among them, the sizes of the upper end cover 1 and the lower end cover 4 are determined by the diameter of the drive shaft 200, and their sizes should ensure that there is no interference with the rotating drive shaft 200.

[0060] A further solution is as Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 shown, the vertical semi-circular plates 2 in both the upper end cover 1 and the lower end cover 4 are hollow plates.

[0061] In a preferred embodiment, the hollow structure on the vertical semi-circular plate 2 is composed of multiple uniformly arranged sector-shaped holes 11; the function of the holes is to ensure the ventilation of the generator, and at the same time, the working states of the interior of the generator and the transmission shaft can be observed. In addition, it can also play a role in safety protection to prevent foreign objects from entering the generator.

[0062] It should be noted that the hollow plate is not limited to the above structure and can be set to other forms of hole distributions, such as square holes, round holes, etc.

[0063] The above-mentioned connecting components will be further described below.

[0064] As shown in Figure 4 , Figure 5 , Figure 6 , the connecting component 6 includes a first connecting component 7 for fixing the upper and lower semi-cylindrical plates 8 and a second connecting component 3 for fixing the upper and lower vertical semi-circular plates 2.

[0065] In a further embodiment, as shown in Figure 9 , Figure 10 , Figure 11 , at least one second connecting component 3 is provided at the splicing joint of the upper and lower vertical semi-circular plates 2 on both sides of the cylinder; the second connecting component 3 includes an upper ear plate 13 with a through hole, a lower ear plate with a through hole, a bolt 16, and a nut 17; the upper ear plate 13 with a through hole is horizontally fixed at the splicing edge of the upper vertical semi-circular plate 2; the lower ear plate with a through hole is horizontally fixed at the splicing edge of the lower vertical semi-circular plate 2, and the upper and lower ear plates can be fitted together, and the upper and lower through holes are coaxially arranged; the bolt 16 is inserted into the upper and lower through holes, and after the bolt 16 is tightened by the nut 17, the upper and lower vertical semi-circular plates 2 are fixed together.

[0066] In a further embodiment, as shown in Figure 4 , Figure 5 , Figure 6 , the first connecting component 7 includes at least one connecting component a9 for axially fixing the upper and lower semi-cylindrical plates 8 and at least one connecting component b10 for radially fixing the upper and lower semi-cylindrical plates 8.

[0067] In a further embodiment, as shown in Figure 4 , Figure 5 , Figure 6 , at least one connecting component a9 is located at the splicing joint of the upper and lower semi-cylindrical plates 8 on one side, and at least one connecting component b10 is located at the splicing joint of the upper and lower semi-cylindrical plates 8 on the other side.

[0068] The above-mentioned connecting component a will be further described below.

[0069] As shown inFigure 7 , Figure 10 , Figure 11 As shown in Figure 7 , Figure 10 , and Figure 11 , the connecting component a9 includes a front ear plate 14 with a through hole, a rear ear plate with a through hole, a bolt 16, and a nut 17; the front ear plate 14 with a through hole is longitudinally fixed at the splicing edge of the upper semi-cylindrical plate 8; the rear ear plate with a through hole is longitudinally fixed at the splicing edge of the lower semi-cylindrical plate 8. The front and rear ear plates can be fitted together, and the front and rear through holes are coaxially arranged; the bolt 16 passes through the front and rear through holes, and after tightening the bolt 16 with the nut 17, the upper and lower semi-cylindrical plates 8 are fixed together.

[0070] The following further explains the above-mentioned connecting component b.

[0071] As Figure 7 , Figure 9 , Figure 10 , Figure 11 As shown in Figure 7 , Figure 9 , Figure 10 , and Figure 11 , the connecting component b10 includes an upper ear plate 15 with a through hole, a lower ear plate with a through hole, a bolt 16, and a nut 17; the upper ear plate 15 with a through hole is horizontally fixed at the splicing edge of the upper semi-cylindrical plate 8; the lower ear plate with a through hole is horizontally fixed at the splicing edge of the lower semi-cylindrical plate 8. The upper and lower ear plates can be fitted together, and the upper and lower through holes are coaxially arranged; the bolt 16 passes through the upper and lower through holes, and after tightening the bolt 16 with the nut 17, the upper and lower semi-cylindrical plates 8 are fixed together.

[0072] The following further explains the above-mentioned first fixing component.

[0073] As Figure 7 , Figure 9 , Figure 10 , Figure 11 As shown in Figure 7 , Figure 9 , Figure 10 , and Figure 11 , the first fixing component 5 is a connecting seat that vertically extends outward around the outer periphery of the semi-cylindrical plate 8, and through holes are provided on the connecting seat and are evenly distributed along its circumferential direction; the fasteners are a plurality of bolts 12, and one bolt 12 passes through one through hole.

[0074] The following further explains the above-mentioned adjusting cover.

[0075] As Figure 2 , Figure 3As shown in the figure, the adjusting cover 18 includes an upper semi-cylindrical plate 20, a semi-annular plate 21, a plurality of threaded rods 22, a plurality of springs 23 and a plurality of nuts 24; the front half of the upper semi-cylindrical plate 20 can be inserted into the semi-cylindrical plate 8 of the upper end cover 1; the semi-annular plate 21 is fixed in the middle of the upper semi-cylindrical plate 20; a plurality of threaded rods 22 are fixed on the side of the semi-annular plate 21 facing the first connecting seat, and one threaded rod 22 is aligned with one through hole, and all the threaded rods 22 are inserted into the corresponding through holes; a plurality of springs 23 are respectively sleeved on the threaded rods 22 located between the first connecting seat and the semi-annular plate 21; a plurality of nuts 24 are respectively screwed onto the threaded rods 22 for fixing the moved upper semi-cylindrical plate 20 on the first connecting seat.

[0076] The following further describes the above-mentioned second fixing member.

[0077] As Figure 2 , Figure 3 shown in the figure, the second fixing member 25 is a second connecting seat vertically extending outward perpendicular to the outer periphery of the upper semi-cylindrical plate 20, and through holes evenly distributed along its circumferential direction are provided on the second connecting seat; the fasteners are a plurality of bolts 26, and one bolt 26 penetrates into one through hole.

[0078] The following further describes the above-mentioned fixing cover.

[0079] The fixing cover 19 is a lower semi-cylindrical plate horizontally extending outward around the outer periphery of the semi-cylindrical plate 8 of the lower end cover 4.

[0080] In summary, the adjustable-length drive shaft protective cover device provided by the present invention is used to protect the rotating drive shaft, cover the generator at the same time, prevent foreign objects from entering the generator, and avoid the harm caused by the rotating drive shaft to people; the upper end cover and the lower end cover are of a split assembly structure, which is convenient for installation and disassembly; openings are provided on the upper end cover and the lower end cover, which can ensure the ventilation of the generator and observe the working conditions of the inside of the generator and the drive shaft at the same time; the axial length of the protective cover is adjustable to adapt to the distance between the generator and the vehicle frame on different vehicles.

[0081] The following describes the engineering vehicle provided by the present invention. The engineering vehicle described below can be mutually referred to the adjustable-length drive shaft protective cover device described above.

[0082] An engineering vehicle provided by the present invention may include the adjustable-length drive shaft protective cover device described in any one of the above embodiments.

[0083] The beneficial effects achieved by the engineering vehicle provided by the present invention are consistent with the beneficial effects achieved by the adjustable-length drive shaft protective cover device provided by the present invention, so they will not be elaborated here.

[0084] It should be noted that the above-mentioned engineering vehicle can be a mining dump truck.

[0085] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0086] In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features contained in other embodiments rather than other features, the combinations of the features of different embodiments also mean that they are within the protection scope of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art can use them in a combined manner according to the known technical solutions and the technical problems to be solved by this application.

[0087] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present invention, can make some changes or modifications using the technical content prompted above into equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A transmission shaft protective cover device with adjustable length, characterized in that: include: The upper end cover and the lower end cover, when butt-jointed together, can form a cylinder and an annular plate extending vertically outward around the inner periphery of the cylinder, the cylinder wraps the transmission shaft connected to the generator, and the annular plate covers the side elevation of the generator located around the transmission shaft; A connecting component, used to fix the upper and lower end covers that are butt-jointed together; An adjusting cover is mounted on the first fixing member on the upper end cover, and the adjusting cover can move axially relative to the upper end cover to adjust the axial length of the upper half of the transmission shaft protective cover device; A fixed cover is installed on the outer end surface of the lower end cover, and forms an axially extending protective cover with the adjusting cover to extend and wrap the transmission shaft; The second fixing component is mounted on the outer end surface of the adjustment cover, and the second fixing component is fixed to the vehicle frame through a fastener.

2. The transmission shaft protective cover device with adjustable length according to claim 1, characterized in that: The upper end cover and the lower end cover are both formed by integrally molding or welding a vertical semicircular plate and a semi-cylindrical plate; The cylinder is formed by butting together the upper and lower semi-cylindrical plates, and the annular plate is formed by butting together the upper and lower vertical semi-circular plates.

3. The transmission shaft protective cover device with adjustable length according to claim 2, characterized in that: The vertical semicircular plates in the upper end cover and the lower end cover are both hollow plates.

4. The transmission shaft protective cover device with adjustable length according to claim 2, characterized in that: The connecting components include a first connecting component for fixing the upper and lower semi-cylindrical plates and a second connecting component for fixing the upper and lower vertical semi-circular plates.

5. The transmission shaft protective cover device with adjustable length according to claim 4, characterized in that: At least one second connecting component is provided at each of the joints of the upper and lower vertical semicircular plates on both sides of the cylinder; the second connecting component includes: An upper ear plate with through holes is transversely fixed to the joint edge of the upper vertical semicircular plate; The lower ear plate with through holes is transversely fixed at the joint edge of the lower vertical semicircular plate, the upper and lower ear plates can be fitted together, and the upper and lower through holes are coaxially arranged; Bolts and nuts are inserted into the upper and lower through holes, and the upper and lower vertical semicircular plates are fixed together after the bolts are tightened by the nuts.

6. The transmission shaft protective cover device with adjustable length according to claim 4, characterized in that: The first connecting component includes at least one connecting component a for axially fixing the upper and lower semi-cylindrical plates and at least one connecting component b for radially fixing the upper and lower semi-cylindrical plates.

7. The transmission shaft protective cover device with adjustable length according to claim 6, characterized in that: At least one connecting component a is located at the joint of the upper and lower semi-cylindrical plates on one side, and at least one connecting component b is located at the joint of the upper and lower semi-cylindrical plates on the other side; The connecting component a comprises: A front ear plate with through holes is longitudinally fixed to the joint edge of the upper semi-cylindrical plate; The rear ear plate with through holes is longitudinally fixed at the joint edge of the lower semi-cylindrical plate, the front and rear ear plates can be fitted together, and the front and rear through holes are coaxially arranged; Bolts and nuts, wherein the bolts are inserted into the front and rear through holes, and the upper and lower semi-cylindrical plates are fixed together after the bolts are tightened by the nuts; The connecting component b comprises: An upper ear plate with through holes is transversely fixed at the joint edge of the upper semi-cylindrical plate; The lower ear plate with through holes is transversely fixed at the joint edge of the lower semi-cylindrical plate, the upper and lower ear plates can be fitted together, and the upper and lower through holes are coaxially arranged; Bolts and nuts are inserted into the upper and lower through holes, and the upper and lower semi-cylindrical plates are fixed together after the bolts are tightened by the nuts.

8. The transmission shaft protective cover device with adjustable length according to claim 2, characterized in that: The first fixing member is a first connecting seat extending vertically outward around the outer periphery of the semi-cylindrical plate of the upper end cover, and the first connecting seat is provided with through holes evenly distributed along its circumference; The adjustment cover comprises: an upper semi-cylindrical plate, the front half of which can be inserted into the semi-cylindrical plate of the upper end cover; A semicircular ring plate fixed to the middle of the upper semi-cylindrical plate; A plurality of threaded rods are fixed on the side of the semicircular ring plate facing the first connecting seat, with one threaded rod aligned with one through hole, and all the threaded rods are inserted into the corresponding through holes; A plurality of springs are respectively sleeved in the threaded rods located between the first connecting seat and the semicircular ring plate; A plurality of nuts are respectively screwed on the threaded rods to fix the moved upper semi-cylindrical plate on the first connecting seat.

9. The transmission shaft protective cover device with adjustable length according to claim 8, characterized in that: The second fixing component is a second connecting seat extending vertically outward around the outer periphery of the upper semi-cylindrical plate, and the second connecting seat is provided with through holes evenly distributed along its circumference; the fastener is a plurality of bolts, and one bolt is inserted into one through hole.

10. The transmission shaft protective cover device with adjustable length according to claim 2, characterized in that: The fixed cover is a lower semi-cylindrical plate horizontally extending outward around the outer periphery of the semi-cylindrical plate of the lower end cover.

11. An engineering vehicle, characterized in that: A transmission shaft protective cover device with adjustable length comprising any one of claims 1 to 10.

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