Protective devices and forklifts

Abstract

This utility model relates to the field of vehicle technology and discloses a protective device and a forklift, comprising: a housing with an internal cavity; a mounting hole penetrating the housing; a mounting cylinder formed by the wall of the housing at the mounting hole extending into the cavity; a radar fixed to the inner wall of the mounting cylinder; the mounting cylinder communicating with the cavity; and a lead wire hole penetrating the housing. The protective device provided by this utility model, by setting a housing with an internal cavity and a mounting hole penetrating the housing, is key in that the wall of the housing surrounding the opening of the mounting hole extends into the cavity to form a cylinder, which is the mounting cylinder. The radar is fixed to the inner wall of the mounting cylinder, and the cavity of the mounting cylinder communicates with the cavity of the housing. On the one hand, the mounting cylinder and the housing form a double-layer protective structure to protect the radar; on the other hand, the cavity can accommodate cables, and the cables can be led out from the cavity through the lead wire hole, extend on the surface of the housing, and connect to the radar, with a simple and direct wiring path.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, specifically to a protective device and a forklift. Background Technology

[0002] Forklifts are important loading and unloading tools for automated material handling. They mainly refer to the forklifts moving goods onto shelves or removing goods from shelves and moving them to designated locations under the guidance of computers.

[0003] A forklift typically consists of a chassis and forks. The forks are mounted on the chassis and are used to pick up and carry goods.

[0004] To improve forklifts' awareness of their environment and prevent collisions during movement, radar is often installed on the vehicle body.

[0005] In related technologies, radar is often directly mounted on the vehicle body. As a result, during the operation of the forklift, it has to withstand the impact of pallets and goods for a long time, which can easily lead to damage to the radar.

[0006] Alternatively, shielding objects, such as metal covers or plastic baffles, can be placed around the radar to reduce the impact of impacts; however, these shielding objects greatly restrict the layout of radar wiring, resulting in long and complex wiring paths that can easily lead to radar malfunctions. Utility Model Content

[0007] In view of this, the present invention provides a protective device and a forklift to solve the problems that radar is easily damaged when directly installed on the vehicle body, and that the radar wiring path is affected when obstructions are placed around the radar, which can easily lead to radar failure.

[0008] In a first aspect, this utility model provides a protective device applicable to radar, comprising: a housing having an internal cavity; a mounting hole extending through the housing; a mounting cylinder formed by the wall of the housing located at the mounting hole, extending in a direction into the cavity; the radar being fixed to the inner wall of the mounting cylinder; the mounting cylinder communicating with the cavity; and a lead wire hole extending through the housing, communicating with the cavity.

[0009] Beneficial effects: By setting up a housing with an inner wall forming a cavity, the cavity provides a basic mounting space for the radar and also provides basic wiring space for the radar. Furthermore, mounting holes are formed through at least a portion of the housing wall, communicating with the cavity. A key feature is that the housing wall surrounding the opening of the mounting holes extends into the cavity, forming a cylindrical section, which serves as the mounting cylinder. The radar is fixed to the inner wall of the mounting cylinder, and the cylinder cavity communicates with the housing cavity. Therefore, on the one hand, the mounting cylinder and housing form a double-layer protective structure, preventing pallets and goods from directly impacting the radar during forklift operation. When the vehicle body is impacted, the structural strength absorbs the impact force through deformation, preventing the impact force from being transmitted and affecting the radar. On the other hand, the cavity can accommodate cables, which can be led out from the cavity through lead holes and extend on the housing surface to connect with the radar. The wiring path is simple and direct, eliminating the need for winding or compression, thus avoiding radar malfunctions caused by wiring issues.

[0010] In one alternative embodiment, the housing includes a first plate and a second plate spaced apart and disposed opposite to each other, the second plate being adapted to be fixed to the vehicle body; a mounting hole is provided through the first plate, and the radar is located on the side of the first plate closer to the second plate.

[0011] Beneficial effects: The first and second plates are parallel and spaced apart. The second plate is fixed to the vehicle body, and the first plate is located on the side of the second plate away from the vehicle body. The mounting hole is through the first plate, and the mounting cylinder is located between the first and second plates. The radar is installed at the mounting cylinder, and the radar is located on the side of the first plate closer to the second plate. That is, the radar is located between the first and second plates, preventing the radar from protruding relative to the first plate towards the side away from the second plate, avoiding the collision of goods with the radar, and playing the role of hiding the radar in the protective device without affecting the radar's signal transmission (the mounting hole is open to the outside). Thus, the radar is isolated and protected without affecting the radar function.

[0012] In one alternative embodiment, the protective device further includes a switch assembly comprising: a baffle rotatably connected to the first plate; an elastic element connected to the housing and sandwiched between the first plate and the baffle, adapted to tilt the baffle relative to the first plate; and a switch disposed on the first plate, with the projection of the baffle onto the second plate covering the switch.

[0013] Beneficial effects: Since the baffle and the first plate are rotatably connected, the pushing force of the cargo overcomes the elastic force of the elastic element, forcing the baffle to rotate around the connection point towards the first plate until the baffle triggers the switch. The switch then sends a signal to the forklift, causing the forklift to stop moving forward and preventing the housing from hitting the cargo due to excessive forward movement.

[0014] In one optional embodiment, after the mounting cylinder extends into the cavity, there is a gap between it and the second plate; or, after the mounting hole extends into the cavity, it is fixed to the second plate, and a through hole is provided through the wall of the mounting cylinder.

[0015] In one optional embodiment, the lead hole is provided through the first plate; the second plate has a first opening provided through it near the radar; a second opening is formed through the second plate, the second opening being a strip-shaped hole; the protective device further includes connecting plates, of which multiple connecting plates are provided, and the multiple connecting plates are respectively connected to the plate body of the second plate located at the first opening and the second opening.

[0016] Beneficial effects: The lead hole is located at the edge of the first plate, and the second plate has a through-hole. The first opening is opposite to the radar and communicates with the cavity. Without affecting the protection effect (the radar is still isolated in the mounting cylinder), it provides a new wiring path for the radar. The cable can enter the cavity through the first opening for wiring or be directly connected to the radar. In addition, a strip-shaped hole, i.e., a second opening, is opened on the second plate. The second opening is located between the lead hole and the first opening, which facilitates wiring. At the same time, a connecting plate is provided at the edge of both the first and second openings. The connecting plate is bent and extends into the cavity to facilitate fixing the wiring harness.

[0017] In one alternative embodiment, the side of the first plate opposite to the second plate is recessed to form a mounting groove; the switch is disposed in the mounting groove, one end of the baffle is rotatably connected to the side wall of the mounting groove, and the elastic element is clamped between the bottom wall of the mounting groove and the baffle.

[0018] Beneficial effects: The elastic element can be, but is not limited to, a torsion spring or a compression spring, connected in the mounting groove to prevent the elastic element from falling off; the baffle can be, but is not limited to, rotatably connected to the side wall of the mounting groove by means of a pin, and connected in cooperation with the elastic element, which plays the role of lifting the baffle to reset it when there is no cargo; the switch is fixed at the bottom of the mounting groove, and can stably cooperate with the baffle when the baffle is pushed and folded by the cargo, sending a signal to the forklift.

[0019] In one alternative embodiment, the housing further includes side plates, which are connected to the first plate and the second plate on both sides respectively, to enclose a cavity between the first plate, the second plate and the side plates.

[0020] Beneficial effects: The side plates are arranged around the edges of the first plate and the second plate, and are connected to the first plate and the second plate on both sides respectively to form a shell. They also form a cavity between the first plate, the second plate and the side plates, providing a basic protective structure for the radar and forming a three-dimensional protective structure that can stably withstand impacts or other interferences and protect the radar from damage.

[0021] In one optional embodiment, the radar includes a base and a transmitting end connected to the base; the base is fixed to the inner wall of the mounting cylinder, and a gap is left between the transmitting end and the inner wall of the mounting cylinder.

[0022] Beneficial effects: While ensuring that the mounting cylinder and housing provide double protection for the radar, it avoids interference with the radar's function, ensures the normal use of the radar, and the protective device is also compatible with various radars of different sizes.

[0023] In one alternative embodiment, at least a portion of the mounting cylinder is inclined relative to the first plate.

[0024] Beneficial effect: Other end faces not connected to the radar are inclined in the direction of gradually decreasing diameter of the mounting cylinder along the direction close to the second plate, so as to improve the structural strength of the mounting cylinder, which can stably withstand impacts and protect the radar from damage.

[0025] Secondly, this utility model also provides a forklift, comprising: a vehicle body; a protective device as described in any of the preceding claims, wherein a second plate of the protective device is fixed to the vehicle body; and forks connected to the vehicle body and disposed near the switch assembly.

[0026] Since forklifts include safety devices that have the same effect as safety devices, they will not be elaborated upon here. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the protective device of this utility model; Figure 2 This is a schematic diagram of the protective device of this utility model from back to front; Figure 3 This is a side view of the protective device of this utility model; Figure 4 This is a schematic diagram of the forklift of this utility model.

[0029] Explanation of reference numerals in the attached figures: 1. Housing; 11. Cavity; 12. Mounting hole; 13. First plate; 131. Mounting groove; 14. Second plate; 141. First opening; 142. Second opening; 15. Side plate; 2. Mounting cylinder; 21. Through hole; 3. Lead wire hole; 4. Switch assembly; 41. Baffle; 42. Elastic element; 43. Switch; 5. Connecting plate; 6. Radar; 61. Base; 62. Transmitter; 7. Vehicle body; 8. Forklifts. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0034] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0035] According to an embodiment of the present invention, a protective device is provided, applicable to a radar 6, comprising: a housing 1 having an internal cavity 11; a mounting hole 12 extending through the housing 1; a mounting cylinder 2 extending from the wall of the housing 1 at the mounting hole 12 toward the cavity 11; the radar 6 being fixed to the inner wall of the mounting cylinder 2; the mounting cylinder 2 communicating with the cavity 11; and a lead wire hole 3 extending through the housing 1 and communicating with the cavity 11.

[0036] In related technologies, radar 6 is easily damaged when directly mounted on vehicle body 7. When obstructions are placed around radar 6, the routing path of radar 6's wiring is affected, which can easily lead to radar 6 failure.

[0037] In this embodiment, a housing 1 is provided, and the inner wall of the housing 1 forms a cavity 11. The cavity 11 provides a basic mounting space for the radar 6 and also provides a basic wiring space for the radar 6. Furthermore, a mounting hole 12 is formed through at least a portion of the wall of the housing 1, and the mounting hole 12 communicates with the cavity 11. A key feature is that the housing 1 extends around the wall at the opening of the mounting hole 12 in the direction of extending into the cavity 11, forming a cylindrical body, which is a mounting cylinder 2. The radar 6 is fixed to the inner wall of the mounting cylinder 2, and the cavity of the mounting cylinder 2 is connected to the cavity of the housing 1. The cavity 11 is connected; thus, on the one hand, the mounting cylinder 2 and the housing 1 form a double-layer protective structure, thereby preventing pallets and goods from directly impacting the radar 6 when the forklift is working, and when the vehicle body 7 is impacted, it absorbs the impact force through deformation by utilizing its own structural strength, preventing the impact force from being transmitted and affecting the radar 6; on the other hand, the cavity 11 can accommodate cables, and the cables can be led out from the cavity 11 through the lead hole 3 and extended on the surface of the housing 1 to connect with the radar 6. The wiring path is simple and direct, without the need for winding or squeezing, avoiding radar 6 failure due to wiring problems.

[0038] In some embodiments, combined with Figure 1 , Figure 3 and Figure 4 As shown, the housing 1 includes a first plate 13 and a second plate 14 spaced apart and arranged opposite to each other. The second plate 14 is adapted to be fixed to the vehicle body 7. The mounting hole 12 is provided through the first plate 13, and the radar 6 is located on the side of the first plate 13 closer to the second plate 14.

[0039] In this embodiment, the first plate 13 and the second plate 14 are arranged parallel and spaced apart. The second plate 14 is fixed to the vehicle body 7, and the first plate 13 is located on the side of the second plate 14 away from the vehicle body 7. The mounting hole 12 is provided through the first plate 13, and the mounting cylinder 2 is provided between the first plate 13 and the second plate 14. The radar 6 is installed at the mounting cylinder 2. At the same time, the radar 6 is located on the side of the first plate 13 closer to the second plate 14, that is, the radar 6 is located between the first plate 13 and the second plate 14. This prevents the radar 6 from protruding relative to the first plate 13 towards the side away from the second plate 14, and avoids the goods from hitting the radar 6. This serves to hide the radar 6 in the protective device, but does not affect the radar 6's signal transmission (the mounting hole 12 is open to the outside). Thus, the radar 6 is isolated and protected without affecting its function.

[0040] In some embodiments, combined with Figure 1 As shown, the protective device also includes a switch assembly 4, which includes: a baffle 41 rotatably connected to the first plate 13; an elastic member 42 connected to the housing 1 and sandwiched between the first plate 13 and the baffle 41, adapted to make the baffle 41 tilted relative to the first plate 13; and a switch 43 disposed on the first plate 13, with the baffle 41 covering the switch in the projection of the second plate 14.

[0041] It should be noted that switch 43 can specifically be a proximity switch. A proximity switch is an existing component. A proximity switch is a position switch that can be operated without direct mechanical contact with a moving part. When an object approaches the sensing surface of the switch to the operating distance, the switch can be activated without mechanical contact or the application of any pressure, thereby driving DC electrical appliances or providing signals to computer devices.

[0042] In this embodiment, when the forklift is stationary, i.e., when the forklift is not working or when there is no cargo on the forklift, the baffle 41 is lifted by the elastic member 42. At this time, the baffle 41 is far away from the switch and cannot activate the switch 43. When the forklift picks up cargo, the cargo gradually approaches the first plate 13 as the forklift moves forward. When the cargo contacts the baffle 41, it will exert a pushing force on the baffle 41 toward the first plate 13. Since the baffle 41 and the first plate 13 are rotatably connected, the cargo pushing force overcomes the elastic force of the elastic member 42, forcing the baffle 41 to rotate around the connection point toward the first plate 13 until the baffle 41 triggers the switch 43. Then the switch 43 sends a signal to the forklift to stop the forklift from moving forward and prevent the housing 1 from hitting the cargo due to excessive forward movement.

[0043] Optionally, during wiring, the cavity 11 can accommodate the cable, and the cable can be led out from the cavity 11 through the lead hole 3 and extended on the side of the first plate 13 opposite to the second plate 14 to connect with the switch. The wiring path is simple and direct, without the need for winding or squeezing, thus avoiding switch failures caused by wiring problems.

[0044] In some embodiments, after the mounting cylinder 2 extends into the cavity 11, a gap is left between it and the second plate 14; or, after the mounting hole 12 extends into the cavity 11, it is fixed to the second plate 14, and a through hole 21 is provided through the wall of the mounting cylinder 2.

[0045] Specifically, the mounting cylinder 2 is formed by the wall of the housing 1 extending into the cavity 11 from the opening of the mounting hole 12. In one embodiment, the end of the mounting cylinder 2 away from the mounting hole 12 can be spaced apart from the second plate 14 so that the internal space of the mounting cylinder 2 is connected to the cavity 11, thereby meeting the wiring requirements of the radar 6. In another embodiment, the end of the mounting cylinder 2 away from the mounting hole 12 can also be directly fixed to the second plate 14. In this case, a through hole 21 needs to be provided through the wall of the mounting cylinder 2 so that the internal space of the mounting cylinder 2 is connected to the cavity 11, thereby meeting the wiring requirements of the radar 6.

[0046] In some embodiments, combined with Figure 1 As shown, the lead hole 3 is provided through the first plate 13; the second plate 14 is provided with a first opening 141 through the second plate near the radar 6; a second opening 142 is formed through the second plate 14, and the second opening 142 is a strip-shaped hole; the protective device also includes a connecting plate 5, and multiple connecting plates 5 are provided, and multiple connecting plates 5 are respectively connected to the plate body of the second plate 14 located at the first opening 141 and the second opening 142.

[0047] In this embodiment, the lead hole 3 is located at the edge of the first plate 13, and the second plate 14 has a through-hole 141. The first opening 141 is opposite to the radar 6 and communicates with the cavity 11. Without affecting the protection effect (the radar 6 is still isolated in the mounting cylinder 2), a new wiring path is provided for the radar 6. The cable can enter the cavity 11 through the first opening 141 for wiring, or be directly connected to the radar 6. In addition, a strip-shaped hole, namely the second opening 142, is opened in the second plate 14. The second opening 142 is located between the lead hole 3 and the first opening 141, which facilitates wiring. At the same time, a connecting plate 5 is provided at the edge of both the first opening 141 and the second opening 142. The connecting plate 5 is bent and extends into the cavity 11 to facilitate fixing the wiring harness.

[0048] In some embodiments, combined with Figure 1 As shown, the side of the first plate 13 facing away from the second plate 14 has a recessed mounting groove 131; the switch 43 is disposed in the mounting groove 131, one end of the baffle 41 is rotatably connected to the side wall of the mounting groove 131, and the elastic element 42 is sandwiched between the bottom wall of the mounting groove 131 and the baffle 41.

[0049] In this embodiment, the elastic element 42 can be, but is not limited to, a torsion spring or a compression spring, connected in the mounting groove 131 to prevent the elastic element 42 from falling off; the baffle 41 can be, but is not limited to, rotatably connected to the side wall of the mounting groove 131 by means of a pin, and is connected in cooperation with the elastic element 42. The elastic element 42 plays the role of lifting the baffle 41 to reset it when there is no cargo; the switch 43 is fixed at the bottom of the mounting groove 131, and can stably cooperate with the baffle 41 when the baffle 41 is folded by the pushing force of the cargo, and send a signal to the forklift.

[0050] In some embodiments, combined with Figure 1 As shown, the housing 1 also includes a side plate 15, which is connected to the first plate 13 and the second plate 14 on both sides to form a cavity 11 between the first plate 13, the second plate 14 and the side plate 15.

[0051] In this embodiment, the side plate 15 is arranged around the edges of the first plate 13 and the second plate 14, and is connected to the first plate 13 and the second plate 14 on both sides to form a shell 1. A cavity 11 is formed between the first plate 13, the second plate 14 and the side plate 15 to provide a basic protective structure for the radar 6 and form a three-dimensional protective structure that can stably withstand impacts or other interferences and protect the radar 6 from damage.

[0052] In some embodiments, combined with Figure 1 As shown, the radar 6 includes a base 61 and a transmitter 62 connected to the base 61; the base 61 is fixed to the inner wall of the mounting cylinder 2, and there is a gap between the transmitter 62 and the inner wall of the mounting cylinder 2.

[0053] In this embodiment, the shape of the mounting hole 12 can be approximately rectangular, and the shape of the mounting cylinder 2 is approximately square, with multiple flat end faces, to facilitate the installation of the radar 6 and improve the fixing effect between the radar 6 and the mounting cylinder 2; the base 61 of the radar 6 is installed on the inner wall of one side of the square cylinder, while the transmitting end 62 is spaced apart from other walls. Under the premise of ensuring that the mounting cylinder 2 and the housing 1 provide double protection for the radar 6, interference with the function of the radar 6 is avoided, ensuring the normal use of the radar 6, and the protective device can also be compatible with various radars 6 of different sizes.

[0054] In some embodiments, combined with Figure 1 As shown, at least a portion of the mounting cylinder 2 is inclined relative to the first plate 13.

[0055] In this embodiment, the shape of the mounting hole 12 can be approximately rectangular, and the shape of the mounting cylinder 2 can be approximately square, with multiple flat end faces. Based on this, the end face of the mounting cylinder 2 connected to the radar 6 can be set perpendicular to the second plate 14 to ensure that when the radar 6 is in use, the detection wave of the transmitting end 62 can smoothly pass through the mounting hole 12 and propagate to the outside, avoiding obstruction by the mounting cylinder 2 or the first plate 13. Other end faces not connected to the radar 6 are inclined in the direction of gradually decreasing diameter of the mounting cylinder 2 along the direction close to the second plate 14 to improve the structural strength of the mounting cylinder 2, so as to stably withstand impacts and protect the radar 6 from damage.

[0056] According to an embodiment of the present invention, another aspect provides a forklift, comprising: a vehicle body 7; a protective device as described in any of the preceding claims, wherein a second plate 14 of the protective device is fixed to the vehicle body 7; and forks 8 connected to the vehicle body 7 and disposed near the switch assembly 4.

[0057] In this embodiment, two sets of switch components 4 are spaced apart at the housing 1, the protective device is fixed to the vehicle body 7, and the forks 8 are located below the protective device. The switch components 4 and the forks 8 are arranged close to each other. The forklift uses the forks 8 to pick up goods. There are two sets of forks 8, and the two sets of forks 8 are respectively arranged in correspondence with the two sets of switch components 4.

[0058] Optionally, the shape of the mounting hole 12 can be approximately rectangular, and the shape of the mounting cylinder 2 can be approximately square, with multiple flat end faces. Based on this, the radar 6 can be connected to the end face of the mounting cylinder 2 away from the fork 8. The base 61 of the radar 6 is fixed to the mounting cylinder 2, and the transmitting end 62 is set towards the fork 8.

[0059] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A protective device, characterized in that Applicable to radar (6), including: The housing (1) has an internal cavity (11); a mounting hole (12) is provided through the housing (1). The mounting cylinder (2) is formed by the wall of the housing (1) located at the mounting hole (12) extending in the direction of entering the cavity (11); the radar (6) is fixed to the inner wall of the mounting cylinder (2); The mounting cylinder (2) is connected to the cavity (11); A lead hole (3) is provided through the housing (1), and the lead hole (3) is connected to the cavity (11).

2. The guard of claim 1, wherein The housing (1) includes a first plate (13) and a second plate (14) spaced apart and arranged opposite to each other, the second plate (14) being adapted to be fixed to the vehicle body (7); The mounting hole (12) is provided through the first plate (13), and the radar (6) is located on the side of the first plate (13) near the second plate (14).

3. The guard of claim 2, wherein, The protective device also includes a switch assembly (4), which includes: A baffle (41) is rotatably connected to the first plate (13). An elastic element (42) is connected to the housing (1) and sandwiched between the first plate (13) and the baffle (41), and is adapted to make the baffle (41) tilted relative to the first plate (13); A switch (43) is disposed on the first plate (13), and the projection of the baffle (41) on the second plate (14) covers the switch (43).

4. The guard of claim 2, wherein After the mounting cylinder (2) extends into the cavity (11), a gap is left between it and the second plate (14); or, After the mounting hole (12) extends into the cavity (11), it is fixed to the second plate (14), and the mounting cylinder (2) has a through hole (21) through its wall.

5. The guard of claim 4, wherein, The lead hole (3) is provided through the first plate (13); The second plate (14) has a first opening (141) through it at a position close to the radar (6). A second opening (142) is formed through the second plate (14), and the second opening (142) is a strip-shaped hole; The protective device also includes a connecting plate (5), which is provided in multiple ways. The multiple connecting plates (5) are respectively connected to the plate body of the second plate (14) located at the first opening (141) and the second opening (142).

6. The guard of claim 3, wherein The side of the first plate (13) facing away from the second plate (14) has a recessed mounting groove (131). The switch (43) is located in the mounting groove (131), one end of the baffle (41) is rotatably connected to the side wall of the mounting groove (131), and the elastic element (42) is sandwiched between the bottom wall of the mounting groove (131) and the baffle (41).

7. The guard device according to any one of claims 2 to 6, characterized in that The housing (1) further includes a side plate (15), which is connected to the first plate (13) and the second plate (14) on both sides to form a cavity (11) between the first plate (13), the second plate (14) and the side plate (15).

8. The guard of claim 7, wherein, The radar (6) includes a base (61) and a transmitter (62) connected to the base (61). The base (61) is fixed to the inner wall of the mounting cylinder (2), and there is a gap between the transmitter (62) and the inner wall of the mounting cylinder (2).

9. The guard of claim 8, wherein, At least a portion of the mounting cylinder (2) is inclined relative to the first plate (13).

10. A fork lift truck characterised in that, include: Vehicle body (7); The protective device as described in any one of claims 1 to 9 above, wherein the second plate (14) of the protective device is fixed to the vehicle body (7). Forks (8) are connected to the vehicle body (7) and are located near the switch assembly (4).

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