Protective device and engineering vehicle

Abstract

The utility model relates to the technical field of engineering machinery, and discloses a protective device which is arranged on a vehicle body and used for protecting an engine and comprises a protective frame, an access door and a quick-release lock plate. One end of the protection frame is connected with a vehicle body. The access door is arranged on the top of the engine and used for being hinged to a vehicle body. The rotating end of the quick release lock plate is hinged to one of the protective frame and the access door, the other one of the protective frame and the access door is provided with a locking pin, a locking groove with an opening is formed in the locking end of the quick release lock plate, the quick release lock plate can rotate between the locking position and the unlocking position relative to the protective frame, and the locking groove is used for limiting the locking pin at the locking position. The opening is used for allowing the locking pin to pass through at the unlocking position. According to the utility model, the access door is locked or unlocked relative to the protective frame by arranging the quick-release lock plate, so that the quick-release lock plate rotates between the locking position and the unlocking position relative to the protective frame, the access door is quickly opened and closed, an engine is conveniently maintained, and parts are not easy to lose.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering machinery, and in particular relates to a protective device and an engineering vehicle. Background Art

[0002] In the prior art, it is difficult to open and close the engine hood. Usually, a split pin and a pin shaft are used to lock or unlock the engine hood protection. However, tools are required and it is impossible to check it anytime and anywhere. Locking and unlocking the engine hood is cumbersome and the split pin needs to be bent repeatedly. The split pin is prone to breakage due to fatigue, causing limit failure. In addition, the split pin and the pin shaft are easily lost after being removed, which affects the normal use of the engine hood. In addition, in the prior art, the engine hood can only be adjusted up and down, with a small adjustment margin in the front and rear directions. It is greatly limited by the length of the pin shaft and lacks the ability to adjust left and right, resulting in assembly difficulties. Utility Model Content

[0003] The utility model aims to provide a protective device and an engineering vehicle, which can rotate between a locked position and an unlocked position, are easy to unlock and realize quick opening and closing of the inspection door, and are convenient for engine maintenance.

[0004] In order to achieve the above-mentioned object, the utility model provides a protective device for being arranged on a vehicle body and protecting an engine, the protective device comprising:

[0005] A protective frame, one end of which is used to connect with the vehicle body;

[0006] An access door is arranged on top of the engine and is hinged to the body;

[0007] A quick-release lock plate, the rotating end of the quick-release lock plate is hinged to one of the protective frame and the inspection door, the other of the protective frame and the inspection door is provided with a locking pin, the locking end of the quick-release lock plate is provided with a locking groove with an opening, the quick-release lock plate can rotate between a locked position and an unlocked position, the locking groove is used to limit the locking pin in the locked position, and the opening is used to allow the locking pin to pass through in the unlocked position.

[0008] In an embodiment of the utility model, the locking groove includes a first recessed portion, a main body portion and a second recessed portion connected in sequence, the main body portion is arranged corresponding to the opening, the first recessed portion and the second recessed portion are both used to lock the locking pin, and the locking pin can be slidably adjusted between the first recessed portion and the second recessed portion.

[0009] In an embodiment of the utility model, the locking end is respectively provided with an upper limit hook and a lower limit hook corresponding to the first recessed portion and the second recessed portion, the opening is located between the upper limit hook and the lower limit hook, and the upper limit hook and the lower limit hook are both provided with guide surfaces for guiding the locking pin.

[0010] In an embodiment of the utility model, the locking pin is located below the rotating end, and the groove wall of the locking groove is used to be close to the locking pin under the gravity of the quick-release lock plate.

[0011] In an embodiment of the utility model, the protective device further comprises two mounting ear plates arranged on the protective frame, and the two ends of the locking pin are respectively fixedly connected to the two mounting ear plates.

[0012] In an embodiment of the utility model, the protective device also includes a locking pin provided on the inspection door, two spaced-apart limiting ear plates, and an articulated shaft plugged into and connected to the two limiting ear plates, the locking pin is used to unlock or lock the articulated shaft and the limiting ear plates, and the rotating end is hinged to the articulated shaft.

[0013] In an embodiment of the utility model, the quick-release lock plate further includes an escape portion, the escape portion is located between the locking end and the rotating end, and the escape portion is bent toward a side away from the inspection door.

[0014] In an embodiment of the utility model, the inspection door is hinged to the vehicle body via a rotating shaft, the rotating shaft extends along the length direction of the vehicle, and the inspection door can rotate around the axis of the rotating shaft.

[0015] In an embodiment of the utility model, the protection device further comprises a first buffer member arranged on the protection frame, and a second buffer member arranged on the inspection door, and the first buffer member is used to abut against the second buffer member when the inspection door is in the locked position.

[0016] In an embodiment of the present invention, an engineering vehicle is provided, comprising the protective device as described above.

[0017] Through the above technical solution, the protective device and engineering vehicle provided by the embodiment of the utility model have the following beneficial effects:

[0018] In the technical solution of the utility model, the protective device is arranged on the vehicle body and used to protect the engine. The protective device includes a protective frame, an inspection door and a quick release lock plate. One end of the protective frame is connected to the vehicle body, and the other end is connected to the inspection door through the quick release lock plate. The inspection door is arranged on the top of the engine and is hinged to the vehicle body. The rotating end of the quick release lock plate is hinged to one of the protective frame and the inspection door. The locking end of the quick release lock plate is provided with a locking groove with an opening. The quick release lock plate can rotate between a locking position and an unlocking position relative to the protective frame. When the quick release lock plate needs to be switched from the unlocking position to the locking position, first, the locking end of the quick release lock plate moves around the rotating end to the side close to the protective frame or the inspection door until the locking end of the quick release lock plate is in the locking position. At this time, the locking groove can cooperate with the locking pin to lock the inspection door and the protective frame. When the locking end moves to the side away from the protective frame or the inspection door, the opening of the locking groove is used for the locking pin to pass through, so that the inspection door and the protective frame are unlocked, and at this time the quick release lock plate is switched from the locking position to the unlocking position. The utility model connects the inspection door and the protective frame by setting a quick-release lock plate. The inspection door and the protective frame can be locked and unlocked only by rotating the quick-release lock plate. The quick-release lock plate does not need to be separated from the inspection door and the protective frame, replacing the method of removing the shaft pin or bolt in the prior art, which can avoid the loss of parts. It is used to lock or unlock the inspection door relative to the protective frame, so that the quick-release lock plate rotates between the locking position and the unlocking position relative to the protective frame, realizing the quick opening and closing of the inspection door. The inspection door and the protective frame can be unlocked and locked without the help of tools, which is convenient for maintenance and repair of the engine. In addition, in the process of locking and unlocking the inspection door, it is not necessary to repeatedly remove the shaft pin or bolt as in the prior art, so as to avoid the damage of the shaft pin or bolt affecting the locking of the inspection door and the protective frame.

[0019] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0021] Figure 1 It is a structural schematic diagram of the protective device according to the utility model;

[0022] Figure 2 It is a structural schematic diagram of the quick-release lock plate according to the utility model;

[0023] Figure 3 It is another structural schematic diagram of the quick-release lock plate according to the utility model;

[0024] Figure 4 It is another structural schematic diagram of the quick-release lock plate according to the utility model.

[0025] Description of Reference Numerals

[0026] 1 Protective frame 325 Second recessed portion

[0027] 11 First buffer member 33 Avoidance portion

[0028] 2 Access door 4 Locking pin

[0029] 21 Second buffer 5 Mounting ear plate

[0030] 3 Quick release lock plate 6 Articulated shaft

[0031] 31 Rotating end 7 Locking pin

[0032] 32 Locking end 8 Limiting ear plate

[0033] 321 Locking groove 9 Rotating axis

[0034] 322 upper limit hook 10 connecting rod

[0035] 323 Lower limit hook 100 engine

[0036] 324 first recessed portion 101 vehicle body DETAILED DESCRIPTION

[0037] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0038] The protective device and the engineering vehicle according to the present utility model are described below with reference to the accompanying drawings.

[0039] like Figure 1 and Figure 2As shown, in an embodiment of the utility model, a protective device is used to be arranged on a vehicle body 101 and protect an engine 100, and the protective device includes a protective frame 1, an inspection door 2 and a quick-release lock plate 3. One end of the protective frame 1 is used to connect with the vehicle body 101. The inspection door 2 is arranged on the top of the engine 100 and is used to be hinged with the vehicle body 101. The rotating end 31 of the quick-release lock plate 3 is hinged to one of the protective frame 1 and the inspection door 2, and the other of the protective frame 1 and the inspection door 2 is provided with a locking pin 4. The locking end 32 of the quick-release lock plate 3 is provided with a locking groove 321 with an opening, and the quick-release lock plate 3 can rotate between a locked position and an unlocked position. The locking groove 321 is used to limit the locking pin 4 in the locked position, and the opening is used to allow the locking pin 4 to pass through in the unlocked position. Among them, the vehicle length direction is Figure 1 The front-to-back direction in the vehicle width direction is Figure 1 A protective frame 1 is provided on both sides of the engine 100 in the front-rear direction, and is locked or unlocked with the inspection door 2 through a quick-release lock plate 3 .

[0040] The protective device is arranged on the vehicle body 101 and is used to protect the engine 100. The protective device includes a protective frame 1, an inspection door 2 and a quick release lock plate 3. One end of the protective frame 1 is connected to the vehicle body 101, and the other end is connected to the inspection door 2 through the quick release lock plate 3. The inspection door 2 is arranged on the top of the engine 100 and is hinged to the vehicle body 101. The rotating end 31 of the quick release lock plate 3 is hinged to one of the protective frame 1 and the inspection door 2. The locking end 32 of the quick release lock plate 3 is provided with a locking groove 321 with an opening. The quick release lock plate 3 can rotate between a locking position and an unlocking position relative to the protective frame 1. When the quick release lock plate 3 needs to be switched from the unlocking position to the locking position, first, the locking end 32 of the quick release lock plate 3 moves around the rotating end 31 to the side close to the protective frame 1 or the inspection door 2 until the locking end 32 of the quick release lock plate 3 is in the locking position. At this time, the locking groove 321 can cooperate with the locking pin 4 to lock the inspection door 2 and the protective frame 1. When the locking end 32 moves to a side away from the protective frame 1 or the inspection door 2, the opening of the locking groove 321 is used for the locking pin 4 to pass through, so that the inspection door 2 and the protective frame 1 are unlocked. At this time, the quick-release lock plate 3 switches from the locked position to the unlocked position.

[0041] The utility model connects the inspection door 2 and the protective frame 1 by setting a quick release lock plate 3. The inspection door 2 and the protective frame 1 can be locked and unlocked only by rotating the quick release lock plate 3. The quick release lock plate 3 does not need to be separated from the inspection door 2 and the protective frame 1, replacing the method of removing the shaft pin or bolt in the prior art, which can avoid the loss of parts. The inspection door 2 is used to lock or unlock relative to the protective frame 1, so that the quick release lock plate 3 rotates between the locking position and the unlocking position relative to the protective frame 1, realizing the quick opening and closing of the inspection door 2. The inspection door 2 and the protective frame 1 can be unlocked and locked without the help of tools, which is convenient for maintenance and repair of the engine 100. In addition, in the process of locking and unlocking the inspection door 2, it is not necessary to repeatedly remove the shaft pin or bolt as in the prior art, so as to avoid the damage of the shaft pin or bolt affecting the locking of the inspection door 2 and the protective frame 1. It is convenient to open the inspection door 2 daily to observe the status of parts in the engine 100 compartment, ensure early detection of problems, effectively prevent the inspectors from neglecting to inspect and maintain the whole machine due to the inconvenience of opening the inspection door 2, and facilitate the inspection of the engine 100 compartment when the whole machine is transported within the factory, and can prevent the pin shaft and bolts from being lost during the transportation inspection within the factory, resulting in missing parts or unqualified products.

[0042] like Figure 3 and Figure 4 As shown, in an embodiment of the utility model, the locking groove 321 includes a first recessed portion 324, a main body portion, and a second recessed portion 325 which are connected in sequence. The main body portion is arranged corresponding to the opening. The first recessed portion 324 and the second recessed portion 325 are both used to lock the locking pin 4. The locking pin 4 can slide and adjust between the first recessed portion 324 and the second recessed portion 325. In which, affected by the distance between the protective frame 1 and the inspection door 2, there is an assembly error in the locking and unlocking of the locking pin 4 and the locking groove 321. After the locking pin 4 enters the locking groove 321 from the opening, it can slide between the first recessed portion 324 and the second recessed portion 325 until it is adjusted to the appropriate position to complete the locking. In which, the opening of the locking groove 321 is slightly larger than the diameter of the locking pin 4 to ensure that the quick-release lock plate 3 can be smoothly inserted into the locking pin 4 manually. The recessed size of the first recessed portion 324 and the second recessed portion 325 can be larger than the diameter of the locking pin 4. The shapes of the first recessed portion 324 and the second recessed portion 325 are not limited to the following. Figure 3 The semicircular groove in the middle is adapted to the locking pin 4, and other shapes that can play a role in limiting adjustment are also acceptable. The quick-release lock plate 3 of the utility model can effectively compensate for assembly errors and is easy to open and close, and locks the inspection door 2 and the protection frame 1 to achieve protection of the engine 100.

[0043] like Figure 3 and Figure 4As shown, in the embodiment of the utility model, the locking end 32 is respectively provided with an upper limit hook 322 and a lower limit hook 323 corresponding to the first recessed portion 324 and the second recessed portion 325, and the opening is located between the upper limit hook 322 and the lower limit hook 323. The upper limit hook 322 and the lower limit hook 323 are both provided with a guide surface for guiding the locking pin 4, ensuring that the locking pin 4 can smoothly pass through the opening. After the locking pin 4 is engaged in the locking groove 321, the upper limit hook 322 and the lower limit hook 323 provided on the locking end 32 can effectively block the locking pin 4, and prevent the locking groove 321 and the locking pin 4 from slipping out of the locking groove 321 due to the loose engagement, thereby affecting the locking effect of the locking groove 321 and the locking pin 4.

[0044] like Figure 3 and Figure 4 As shown, in the embodiment of the utility model, the locking pin 4 is located below the rotating end 31, and the groove wall of the locking groove 321 is used to be close to the locking pin 4 under the gravity of the quick-release lock plate 3. Due to the existence of gravity, the inner wall of the quick-release lock plate 3 is always in close contact with the locking pin 4 under the action of gravity, ensuring that the locking pin 4 will not fall out when the vehicle body 101 vibrates, walks or other situations, thereby improving the locking stability of the inspection door 2 and the protective frame 1. When the inspection door 2 is locked with the protective frame 1, the locking groove 321 opening of the quick-release lock plate 3 is inserted into the locking pin 4, and the locking pin 4 passes through the ear plate holes of the two mounting ear plates 5 and is fixed on the mounting ear plates 5. Due to the existence of assembly errors, the locking pin 4 inserted into the opening of the locking groove 321 will not be centered on the opening side of the locking groove 321, thereby preventing the locking pin 4 from slipping out of the opening of the locking groove 321.

[0045] In an embodiment of the utility model, the protective device further comprises two mounting ear plates 5 arranged on the protective frame 1, and the two ends of the locking pin 4 are respectively fixedly connected to the two mounting ear plates 5. In an embodiment of the utility model, the mounting ear plates 5 are fixedly connected to the locking pin 4. Preferably, the mounting ear plates 5 are connected and fixed to the locking pin 4 by welding, which improves the strength of the connection structure and ensures the stability of the locking of the protective frame 1 and the inspection door 2. Among them, the locking pin 4 can be selected from steel pipes, round steel or other long strips of objects, and can be adapted to the locking end 32 of the quick-release lock plate 3 to achieve the locking and unlocking of the protective frame 1 and the inspection door 2. The limit failure caused by the loss of the pin shaft and the bolt during the use of the machine in the prior art is effectively eliminated.

[0046] In the embodiment of the utility model, the protective device also includes a locking pin 7 provided on the inspection door 2, two spaced limiting ear plates 8, and a hinge shaft 6 plugged and connected to the two limiting ear plates 8. The locking pin 7 is used to unlock or lock the hinge shaft 6 and the limiting ear plates 8. The rotating end 31 is hinged to the hinge shaft 6, and the assembly and disassembly operations are convenient, which is conducive to convenient maintenance and replacement of the quick-release lock plate 3. It should be noted that the limiting ear plates 8 and the installation ear plates 5 are both ear plates in the prior art. Of course, if necessary, the limiting ear plates 8 and the hinge shaft 6 can also be fixedly connected.

[0047] like Figure 3 and Figure 4 As shown, in the embodiment of the utility model, the quick release lock plate 3 further includes an avoidance portion 33, the avoidance portion 33 is located between the locking end 32 and the rotating end 31, and the avoidance portion 33 is bent toward the side away from the inspection door 2. The protective tube at the end of the inspection door 2 in the locked position is arranged above the protective tube at the end of the protective frame 1, and due to the relative position relationship between the limiting ear plate 8 and the mounting ear plate 5, the quick release lock plate 3 is provided with the avoidance portion 33 to ensure the range of rotation adjustment around the rotating end 31, and the avoidance portion 33 is bent toward the side away from the inspection door 2, and is used to avoid the protective tube at the end of the inspection door 2, so as to avoid affecting the locking and unlocking of the locking end 32 and the locking pin 4.

[0048] like Figure 1 As shown, in the embodiment of the utility model, the inspection door 2 is hinged to the vehicle body 101 through the rotating shaft 9, the rotating shaft 9 extends in the vehicle length direction, and the inspection door 2 can rotate around the axis of the rotating shaft 9. Among them, a flip seat is provided on the vehicle body 101, and the flip seat is located on the left side of the engine 100. One end of the flip seat is fixed to the vehicle body 101, and the other end is connected to the inspection door 2 through a connecting rod 10. The connecting rod 10 is connected to the rotating shaft 9 and rotates around the axis with the rotating shaft 9 to realize the flip adjustment of the inspection door 2, which is convenient for repairing the engine 100. Preferably, the connecting rod 10 is a T-shaped structure, and the connecting rod 10 is composed of a hinged part and a connecting part. The hinged part is pivotally connected to the flip seat through the rotating shaft 9, and the connecting part is connected to the inspection door 2. The cross-sectional size of the connecting part is larger than the cross-sectional size of the hinged part, which increases the contact area between the connecting rod 10 and the inspection door 2 and improves the connection stability between the connecting rod 10 and the inspection door 2. Preferably, a plurality of flip seats are arranged at intervals along the length direction of the vehicle, and the plurality of flip seats are all connected to the inspection door 2 , thereby further improving the flipping stability of the inspection door 2 .

[0049] like Figure 1As shown, in the embodiment of the utility model, the protective device also includes a first buffer 11 arranged on the protective frame 1, and a second buffer 21 arranged on the inspection door 2, and the first buffer 11 is used to abut against the second buffer 21 when the inspection door 2 is in the locked position. Among them, the second buffer 21 is an annular pipe sleeve, which is sleeved on the protective pipes at the front and rear ends of the inspection door 2, and the ends of the second buffer 21 in the left and right directions are provided with limiting protrusions, which are used to cooperate and clamp the first buffer 11 to prevent the second buffer 21 from sliding along the protective pipe and affecting the buffering cooperation between the first buffer 11 and the second buffer 21. The first buffer 11 is fixedly connected to the protective frame 1, and a buffering recess is formed on the top. The shape of the buffering recess is adapted to the shape of the second buffer 21, which is conducive to the buffering cooperation between the first buffer 11 and the second buffer 21. Preferably, both the first buffer 11 and the second buffer 21 can be made of impact-resistant and wear-resistant materials.

[0050] In an embodiment of the utility model, an engineering vehicle is proposed, including the protective device as described above. Since the engineering vehicle adopts all embodiments of the protective device, it also has all the beneficial effects brought by the protective device, which will not be described in detail here. Of course, in addition to being used for engineering machinery such as excavators, this technical solution can also be used in any device that requires a limit structure that can quickly disassemble and compensate for assembly errors.

[0051] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0054] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A protective device, used to be arranged on a vehicle body (101) and protect an engine (100), characterized in that: The protective device comprises: A protective frame (1), one end of which is used to be connected to the vehicle body (101); An inspection door (2) arranged on the top of the engine (100) and hinged to the vehicle body (101); A quick-release lock plate (3), a rotating end (31) of the quick-release lock plate (3) is hinged to one of the protective frame (1) and the inspection door (2), the other of the protective frame (1) and the inspection door (2) is provided with a locking pin (4), a locking end (32) of the quick-release lock plate (3) is provided with a locking groove (321) with an opening, the quick-release lock plate (3) can rotate between a locking position and an unlocking position, the locking groove (321) is used to limit the locking pin (4) in the locking position, and the opening is used to allow the locking pin (4) to pass through in the unlocking position.

2. The protective device according to claim 1, characterized in that: The locking groove (321) comprises a first recessed portion (324), a main portion and a second recessed portion (325) which are connected in sequence, the main portion being arranged corresponding to the opening, the first recessed portion (324) and the second recessed portion (325) being used to lock the locking pin (4), and the locking pin (4) can be slidably adjusted between the first recessed portion (324) and the second recessed portion (325).

3. The protective device according to claim 2, characterized in that: The locking end (32) is provided with an upper limit hook (322) and a lower limit hook (323) corresponding to the first recessed portion (324) and the second recessed portion (325), respectively; the opening is located between the upper limit hook (322) and the lower limit hook (323); and the upper limit hook (322) and the lower limit hook (323) are both provided with guide surfaces for guiding the locking pin (4).

4. The protection device according to any one of claims 1 to 3, characterized in that: The locking pin (4) is located below the rotating end (31), and the groove wall of the locking groove (321) is used to be closely attached to the locking pin (4) under the action of gravity of the quick-release lock plate (3).

5. The protection device according to any one of claims 1 to 3, characterized in that: The protective device also includes two mounting ear plates (5) arranged on the protective frame (1), and the two ends of the locking pin (4) are respectively fixedly connected to the two mounting ear plates (5).

6. The protection device according to any one of claims 1 to 3, characterized in that: The protective device also includes a locking pin (7) provided on the inspection door (2), two spaced apart limiting ear plates (8), and a hinge shaft (6) plugged and connected to the two limiting ear plates (8), wherein the locking pin (7) is used to unlock or lock the hinge shaft (6) and the limiting ear plates (8), and the rotating end (31) is hinged to the hinge shaft (6).

7. The protection device according to any one of claims 1 to 3, characterized in that: The quick-release lock plate (3) further comprises an escape portion (33), the escape portion (33) being located between the locking end (32) and the rotating end (31), and the escape portion (33) being bent towards a side away from the inspection door (2).

8. The protection device according to any one of claims 1 to 3, characterized in that: The inspection door (2) is hinged to the vehicle body (101) via a rotating shaft (9); the rotating shaft (9) extends in the vehicle length direction; and the inspection door (2) can rotate around the axis of the rotating shaft (9).

9. The protection device according to any one of claims 1 to 3, characterized in that: The protection device further comprises a first buffer member (11) arranged on the protection frame (1), and a second buffer member (21) arranged on the inspection door (2), wherein the first buffer member (11) is used to abut against the second buffer member (21) when the inspection door (2) is in a locked position.

10. An engineering vehicle, characterized in that: Comprising a protection device according to any one of claims 1 to 9.

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