Engineering vehicle tail tow air hose arrangement

Abstract

The application provides an engineering vehicle tail towed air pipe device, which comprises a mounting seat, a limiting component and a locking component. The mounting seat is fixedly connected to the tail of the engineering vehicle. The limiting component for guiding the air pipe to be retracted and extended is arranged on the mounting seat. The limiting component comprises two oppositely arranged side plates. A detachable blocking rod is connected between the two side plates and forms a limiting space for accommodating the air pipe and making the two ends of the air pipe extend out. The locking component is arranged above the two side plates and is used for locking the air pipe on the mounting seat and between the two side plates. The locking component comprises a locking rod rotatably connected with one of the side plates and a fastener connected with the locking rod and used for detachably connecting the other side plate. Through the above structure, the air pipe can be limited in a preset area during the towing process, and can be conveniently assembled and disassembled when needed, and is suitable for towing use of engineering vehicles.

Description

Technical Field

[0001] This application relates to the field of auxiliary equipment technology for drilling operations in mines, and in particular to a device for trailing ventilation ducts at the rear of an engineering vehicle. Background Technology

[0002] In mining drilling and blasting operations, tunnel ventilation engineering, and rock drilling construction, it is often necessary to deliver compressed air or ventilation airflow to the work location through ducts. As the work area moves, it is common to use engineering vehicles to tow ducts for mobile air supply. In order to improve the efficiency of duct installation and reduce manual operation, the industry is gradually moving from manual towing to mechanically assisted towing. However, the existing structures at the rear of vehicles used for duct towing are mostly simple supports or hooks, and there is no dedicated fixing device for the dynamic towing process of ducts.

[0003] In existing technologies, duct towing typically relies on manual support or simple fasteners such as hooks and straps to be attached to the rear of the vehicle. As the vehicle moves, the duct moves with it, transferring the air supply line. While this method achieves movement, the duct's support and restraint during vehicle movement are poor, making it prone to twisting, detachment, or wear due to swaying or road bumps. Some solutions attempt to improve towing stability by reinforcing attachment points or adding flexible fasteners, but they still lack a structure to support the duct and restrict its lateral movement, and it is difficult to effectively compress or release the duct during vehicle movement.

[0004] Therefore, the key issue with existing technologies lies in how to reliably fix and controllably release the duct near the rear of the vehicle during the movement and towing of the duct, ensuring that the duct can be stably supported while being easily disassembled and reassembled when needed, thus adapting to the dynamic operating conditions of the vehicle. Because existing devices generally lack structures for creating a limiting space and for clamping and locking, the duct is prone to loosening or difficulty in quickly unlocking during construction, necessitating improvements. Utility Model Content

[0005] This application provides a device for towing air ducts at the rear of an engineering vehicle to solve the problem of reliably fixing and controllably releasing air ducts during the towing process of an engineering vehicle.

[0006] This application provides a device for a rear-mounted ventilation duct of an engineering vehicle, including a mounting base, a limiting component, and a locking component; The mounting base is fixedly connected to the rear of the engineering vehicle. The mounting base is provided with a limiting component for guiding the retraction and extension of the air duct. The limiting component includes two side plates arranged opposite each other. A detachable stop bar is connected between the two side plates to form a limiting space for accommodating the air duct and allowing the air duct to extend at both ends. The locking component is located above the two side plates and is used to lock the air duct on the mounting base and between the two side plates. The locking component includes a locking rod rotatably connected to one of the side plates and a fastener connected to the locking rod for detachably connecting to the other side plate.

[0007] In one optional embodiment, the upper part of the mounting base is provided with an arc-shaped guide groove for supporting the air duct. The arc-shaped guide groove is located between the lower parts of the two side plates and together with the two side plates, forms a guide space for supporting the air duct so that the air duct can be retracted or extended.

[0008] In one optional embodiment, the mounting base is provided with a guide wheel for guiding the running direction of the air duct. The guide wheel is rotatably mounted on the mounting base and located behind the arc-shaped guide groove, and the upper rim of the guide wheel is flush with the support position of the arc-shaped guide groove in the height direction.

[0009] In one alternative embodiment, one end of the locking rod is rotatably connected to one of the side plates via a hinge shaft, and the other end can cross the limiting space and abut against the other side plate. The fastener is a screw rod provided on the locking rod, and the screw rod can be screwed into a threaded hole on the side plate at one end and detachably connected to the locking rod.

[0010] In one optional embodiment, the bottom end of the mounting base is provided with a base plate, and the base plate has mounting holes for connecting and fixing to the rear of the engineering vehicle by fasteners.

[0011] In one optional embodiment, the rear of the mounting base is further provided with a drum support assembly for winding and storing the air duct. The drum support assembly includes a drum and a support frame for mounting the drum. The drum is rotatably mounted on the support frame via a shaft and bearing assembly. The bottom end of the support frame is detachably connected to the rear of the engineering vehicle, and the front end of the support frame is detachably connected to the rear end of the mounting base.

[0012] In one optional embodiment, the two ends of the drum are respectively provided with side baffles for limiting the duct from sliding out, and the side of the support frame is provided with a driving component for driving the drum to rotate. The driving component is a manual crank or a power input end connected to a power source, used to drive the drum to wind the duct when the duct is retracted.

[0013] In one alternative embodiment, the upper rim of the guide wheel is provided with an arc-shaped groove that matches the outer diameter of the duct.

[0014] Compared with the prior art, this application has the following beneficial effects: 1. This application provides a device for towing ductwork at the rear of an engineering vehicle. By installing a mounting base at the rear of the engineering vehicle and a limiting structure consisting of two opposing side plates and a detachable stop bar between them, the ductwork can be kept within a defined area during use. The side plates constrain the ductwork laterally, and the stop bar forms a structural boundary to prevent the ductwork from detaching outwards during vehicle operation or towing. This helps keep the ductwork within the preset area, reducing positional displacement caused by vehicle vibration, and is suitable for towing operations. When the ductwork needs to be disassembled, the stop bar is detachable, allowing operators to easily remove or reinsert the ductwork into the limited area, making it suitable for on-site maintenance.

[0015] 2. This application further includes a locking structure located above the limiting area, comprising a rotatably mounted locking rod and fasteners for connecting the locking rod to the other side plate. When the duct is in a towing state, the locking rod can be rotated to press down on the duct and formed a basic fixation through a fastening connection, making it difficult for the duct to undergo significant displacement during vehicle operation. When manual adjustment or replacement of the duct is required, the operator only needs to loosen the fasteners and rotate the locking rod away from the limiting area to release the duct without the need for additional disassembly of other components. This method facilitates switching between towing and manual operation states and is convenient for on-site use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of a rear-mounted ventilation duct device for an engineering vehicle provided in an embodiment of this application; Figure 2 A schematic diagram from another perspective of the engineering vehicle rear-mounted air duct device provided in an embodiment of this application; Figure 3 This is a structural schematic diagram of an engineering vehicle tail-mounted air duct device provided in another embodiment of this application; Figure 4 This is a schematic diagram of the structure of a roll support assembly provided in an embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: 100-Mounting base; 110-Arc-shaped guide groove; 120-Base plate; 121-Mounting hole; 200-Limiting assembly; 210-Side plate; 220-Stop bar; 300-Locking assembly; 310-Locking rod; 320-Fastener; 400-Guide wheel; 500-Drum support assembly; 510-Drum; 511-Side baffle; 512-Drive component; 520-Support frame. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0020] like Figures 1-4 As shown in the figure, this application provides a device for towing a ventilation duct at the rear of an engineering vehicle, including a mounting base 100, a limiting component 200, and a locking component 300.

[0021] The mounting base 100 is fixedly connected to the rear of the engineering vehicle. The mounting base 100 is provided with a limiting component 200 for guiding the retraction and extension of the air duct. The limiting component 200 includes two side plates 210 arranged opposite each other. A detachable stop bar 220 is connected between the two side plates 210 to form a limiting space for accommodating the air duct and allowing the air duct to extend at both ends. The locking component 300 is disposed above the two side plates 210 and is used to lock the air duct on the mounting base 100 and is located between the two side plates 210. The locking component 300 includes a locking rod 310 rotatably connected to one of the side plates 210 and a fastener 320 connected to the locking rod 310 for detachably connecting the other side plate 210.

[0022] In the above embodiment, the mounting base 100 is fixedly installed at the rear of the engineering vehicle to provide an installation position for placing and operating the air duct. A limiting component 200 is installed on the mounting base 100 and consists of two opposing side plates 210 and a detachable stop bar 220 located between the side plates, allowing the air duct to pass through the limiting area between the two side plates 210 during use. The side plates 210 restrict the duct's lateral position, and the stop bar 220 is generally arranged above or to the side of the area where the air duct is located. By forming a structurally closed boundary, it restricts the air duct's deviation and movement during vehicle operation or towing, preventing it from detaching from the limiting area. The stop bar 220 does not bear the weight of the air duct; its main function is to limit and prevent detachment. When it is necessary to remove or reinsert the air duct, the stop bar 220 can be disassembled to allow the air duct to be moved laterally out of or reinsert from the limiting area, facilitating on-site organization and operation.

[0023] Furthermore, in the above embodiment, the locking assembly 300 is arranged above the limiting assembly 200, and includes a locking rod 310 rotatably connected to one of the side plates 210 and a fastener 320 connected to the locking rod 310. When the duct needs to be in a towing state, the locking rod 310 can turn to the upper part of the limiting area to press against the duct, and then connect to the other side plate 210 through the fastener 320, so that the duct is locked in this structural position and is not easily displaced by vehicle movement. When the duct needs to be replaced or manually adjusted, the operator can loosen the fastener 320 and turn the locking rod 310 away from the limiting area, and the duct can be removed or repositioned from this position. This structure is simple to install and is suitable for use cases that require switching between towing and manual operation states.

[0024] In this embodiment, the device is applicable to common flexible or semi-flexible ducts. The duct diameter can usually be selected within a certain range, such as between a few centimeters and more than ten centimeters (the specific size can be determined according to the actual engineering environment). In actual manufacturing and application, the spacing between the side plates in the limiting component and the pressing position of the locking rod in the locking component can be set according to the duct diameter so that the duct can be smoothly inserted into the limiting area and maintain basic positioning after assembly.

[0025] The stop bar can be connected to the side plates via a pin-type or screw-in type. During operation, on-site personnel can disassemble or lock it by pulling out the pin or tightening the screw, depending on the usage. This connection method is a common manual disassembly and assembly method used in construction machinery, which can be completed without the use of special tools. It is beneficial for the duct to be moved out or put back in laterally when needed, improving the flexibility of on-site scheduling, while not affecting the overall stability of the limit component structure.

[0026] In addition, when the locking rod is pressing against the duct, its end position can be finely adjusted using fasteners, thereby achieving appropriate adjustment of the pressing gap to accommodate ducts of different diameters. This method helps to avoid excessive pressing force causing local deformation of the duct, and also avoids loose pressing causing unstable positioning of the device during towing, ensuring that the locking function remains effective under various operating conditions.

[0027] In some embodiments, the upper part of the mounting base 100 is provided with an arc-shaped guide groove 110 for supporting the air duct. The arc-shaped guide groove 110 is located between the lower parts of the two side plates 210 and together with the two side plates 210 forms a guide space for supporting the air duct so that the air duct can be retracted or extended.

[0028] In the above embodiment, the arc-shaped guide groove 110 is disposed on the upper part of the mounting base 100, located below the two oppositely arranged side plates 210, allowing the duct to fall into the groove during retraction and extension. The arc-shaped guide groove 110 is designed according to the cross-sectional shape of the duct. When the duct moves to this position, it can be supported by the arc-shaped guide groove 110 to prevent the duct from sinking when passing through the limiting area. The side plates 210 restrict the duct's swing in the left and right directions, and the arc-shaped guide groove 110 supports the duct. Together, they define the basic position of the duct during passage, making it less likely for the duct to undergo large displacement due to slight vibrations when towed by the vehicle. Because the surface of the arc-shaped guide groove 110 is curved, the contact between the duct and the groove is relatively smooth, which is suitable for the duct to enter and exit during movement and helps to reduce direct friction and impact with the mounting base 100. This structure plays a supporting and basic guiding role during the retraction and extension of the duct, maintaining the stability of the duct's position in the area it passes through under vehicle operating conditions, and is suitable for duct towing operations.

[0029] In some embodiments, the mounting base 100 is provided with a guide wheel 400 for guiding the running direction of the air duct. The guide wheel 400 is rotatably mounted on the mounting base 100 and located behind the arc-shaped guide groove 110. The upper rim of the guide wheel 400 is flush with the support position of the arc-shaped guide groove 110 in the height direction.

[0030] In the above embodiment, the guide wheel 400 is mounted on the mounting base 100 and located behind the arc-shaped guide groove 110. The upper rim of the guide wheel is substantially aligned in height with the position of the arc-shaped guide groove 110 for supporting the duct, allowing the duct to contact the guide wheel 400 at a similar height when moving to this area. When the duct extends backward from the arc-shaped guide groove 110, if there is a large height difference with the subsequent components, it may bounce or bend locally when passing through the structural junction. By aligning the height of the guide wheel 400 with the support position of the arc-shaped guide groove 110, the duct can be smoothly connected between the two structures, reducing unstable movement caused by height differences. The guide wheel 400 is rotatably mounted, allowing for rolling contact when the duct passes through this area, which helps reduce sliding resistance between the duct and the structural surface during movement, making it suitable for applications involving extension and retraction.

[0031] In some embodiments, one end of the locking rod 310 is rotatably connected to one of the side plates 210 via a hinge shaft, and the other end can cross the limiting space and abut against the other side plate 210. The fastener 320 is a screw provided on the locking rod 310, and the screw can be screwed into the threaded hole on the side plate 210 at one end and detachably connected to the locking rod 310.

[0032] In the above embodiment, one end of the locking rod 310 is connected to one of the side plates 210 via a hinge shaft, allowing it to rotate around the connection point. When the duct is placed in the limiting space, the operator can rotate the locking rod 310 towards the limiting space, causing the other end of the locking rod 310 to cross the area where the duct is located and abut against the other side plate 210, thus creating a pressing effect from above. A screw on the locking rod 310 serves as a fastener 320, which can be screwed into the threaded hole on the side plate 210, fixing the locking rod 310 in its working position. This connection method is convenient for manual operation, allowing locking without disassembling components. When the vehicle is towed, the locking rod can, to a certain extent, limit significant vertical or lateral displacement of the duct. When it is necessary to release the duct, the locking state can be released by loosening the screw and rotating the locking rod away from the limiting area, making it suitable for on-site duct arrangement or removal operations.

[0033] In some embodiments, the bottom end of the mounting base 100 is provided with a base plate 120, and the base plate 120 is provided with mounting holes 121 for connecting and fixing to the rear of the engineering vehicle by fasteners.

[0034] In this embodiment, a base plate 120 is provided at the bottom end of the mounting base 100, and mounting holes 121 are provided on the base plate 120 for connection to the rear of the engineering vehicle via fasteners such as bolts or pins. By providing mounting holes at the base plate, the device can be fixed at the rear of the vehicle, giving the mounting base 100 a clear installation position during towing. This design facilitates on-site installation by construction personnel and also facilitates later maintenance or position adjustment, making it suitable for situations requiring switching between different engineering vehicles or structural inspections.

[0035] In some embodiments, the rear of the mounting base 100 is further provided with a drum support assembly 500 for winding and storing air ducts. The drum support assembly 500 includes a drum 510 and a support frame 520 for mounting the drum 510. The drum 510 is rotatably mounted on the support frame 520 via a shaft and bearing assembly. The bottom end of the support frame 520 is detachably connected to the rear of the engineering vehicle, and the front end of the support frame 520 is detachably connected to the rear end of the mounting base 100.

[0036] In the above embodiment, the drum support assembly 500 is located at the rear of the mounting base 100. The support frame 520 is detachably connected to the rear of the engineering vehicle and the mounting base 100, respectively, and can be replaced or maintained according to usage. The drum 510 is rotatably mounted on the support frame 520 via a shaft and bearing assembly. When the operator winds up the duct, the duct can be gradually wound along the outer surface of the drum, which is beneficial for orderly winding and unwinding under manual or power-driven conditions. In practical applications, after the support frame 520 and the mounting base 100 are connected, the installation areas of the drum 510 and the front arc-shaped guide groove 110 and guide wheel 400 should be roughly spatially aligned. When the duct extends backward from the front limiting structure, it can directly enter the winding area, facilitating subsequent handling.

[0037] In this embodiment, the entire roll support assembly 500 is installed behind the mounting base 100, providing the operator with sufficient operating range when performing duct retraction and extension at the rear of the vehicle. This is suitable for duct retraction operations when the vehicle is parked or moving at low speed.

[0038] When the drum support assembly is installed at the rear of the engineering vehicle, it can be basically fixed and positioned with the rear of the vehicle and the mounting base through positioning holes, limiting grooves, or mating surfaces. Bolts or pins can be used for locking during installation, and the fasteners can be released to detach it when disassembly or vehicle replacement is required. This structure is a conventional mechanical connection method, which is beneficial for switching the device between different vehicles or for later maintenance. It also ensures that the rotation axis of the drum is basically horizontal after the assembly is installed, meeting the structural requirements for duct winding operations.

[0039] In some embodiments, the two ends of the drum 510 are respectively provided with side baffles 511 for limiting the duct from sliding out, and the side of the support frame 520 is provided with a drive member 512 for driving the drum 510 to rotate. The drive member 512 is a manual crank or a power input end connected to a power source, used to drive the drum 510 to wind the duct when the duct is retracted.

[0040] In the above embodiment, side baffles 511 are provided at both ends of the drum 510. When the duct is wound on the drum 510, the side baffles 511 can form a stop surface when the duct approaches the edge of the drum, which helps the duct maintain its basic position within the winding area and reduces the possibility of it shifting outward in the width direction of the drum. A drive member 512 is provided on the side of the support frame 520. The drive member 512 is connected to the drum 510 and can drive the drum to rotate by manual shaking or power input, so that the duct is gradually wound around the surface of the drum during the winding operation. The drive member 512 is located close to the side of the drum 510, so that when the user operates at the rear of the vehicle, he can directly apply force to the drum 510 without pulling the duct, which is suitable for on-site sorting or recycling operations.

[0041] When using ductwork, on-site personnel can first place the ductwork within the limiting area and secure it to the rear of the vehicle by tightening the locking lever. The vehicle can then tow the ductwork at low speed. When ductwork needs to be retrieved, the operator can release the locking assembly, separating the ductwork from the limiting structure, and then use the drive mechanism to wind and retrieve the ductwork onto a drum. This method is suitable for ductwork towed within an engineering site, and the appropriate operating speed and path can be selected based on the specific operating environment and safety requirements.

[0042] In some embodiments, the upper rim of the guide wheel 400 is provided with an arc-shaped groove that matches the outer diameter of the duct.

[0043] In the above embodiment, the upper rim of the guide wheel 400 is provided with an arc-shaped groove, allowing the duct to make a close contact with the rim when it moves to this position. The arc-shaped groove is designed according to the outer diameter shape of the duct, allowing the duct to be partially embedded in the groove when passing through the guide wheel area, which helps to reduce the lateral movement range when in contact with the rim. When the duct slides along the circumference within the groove, the contact is a surface fit, which is easier to maintain a relatively stable position during movement than a line contact. This is suitable for reducing significant duct deviation in this area when there is slight shaking caused by vehicle operation. Moreover, the guide wheel 400 occupies less space when introduced, and can provide a local support path for the duct during duct retraction and extension operations, allowing the duct to move along the groove direction when passing through this part, facilitating subsequent extension or arrangement to the drum area.

[0044] This device is suitable for engineering vehicles with an open platform, plate structure, or frame structure at the rear, including but not limited to engineering vehicles used for conveying or discharging gases, ventilation auxiliary vehicles, and water sprinkler vehicles. The mounting base can be installed and adjusted according to the fixed position at the rear of the vehicle. The device can be structurally arranged in different types of engineering vehicles through conventional mechanical connection methods, and has a certain degree of on-site adaptability. It is suitable for duct towing operations while in motion.

[0045] Additionally, it should be noted that the angles, spacing, and installation methods of the components in this application can be appropriately adjusted according to the duct specifications and the rear structure of the vehicle, making it suitable for towing flexible or semi-flexible ducts. The actual usage process can be set according to site conditions; for example, the vehicle can tow the duct at low speed, and operators can retract or manually adjust it as needed using a reel. The structures described in this application are all conventional mechanical connection types, and those skilled in the art can optimize the settings according to equipment usage requirements without affecting the implementation of this solution.

[0046] During actual towing of ductwork by engineering vehicles, the ductwork is typically in a multi-degree-of-freedom state at the rear of the vehicle. Vibrations from vehicle movement, acceleration and deceleration impacts, or road undulations can all cause the ductwork to sway, twist, or shift its position. Simply relying on hooks or ties for fixation often fails to meet both towing and manual handling requirements, and can easily cause jamming or secondary processing during the transition between towing and manual intervention. Furthermore, because ductwork typically has a certain degree of flexibility, the support and limiting requirements at the rear of the vehicle change in stages when switching between towing and manual intervention. Traditional solutions often focus on one condition while neglecting the structural coordination between the two. This application addresses this by placing the limiting, locking, and retraction / transition structures in the same installation area, and using rotatable and detachable methods to form structural boundaries and positional constraints, enabling a stable transition between towing and manual handling conditions. This structural combination is not a simple replacement of a single fixing component, but rather a suitable solution to the difficulty of position control of ductwork during vehicle towing. Conventional designs typically do not differentiate between limiting and switching operations, making them easily overlooked.

[0047] In actual construction, it has been found that the operation of engineering vehicles towing ducts varies, often requiring positioning, towing, and manual intervention based on different operational needs. Temporary tying or manual handling are commonly used on-site, leading to duct instability or operational inconvenience. The solution described in this application is based on years of experience. By centrally arranging the limiting structure, locking structure, and retraction / extension conversion components at the rear of the vehicle, the duct can be directly switched between towing and manual handling without relying on additional tools. This structure is adapted to the characteristics of on-site operations and is not derived from a single fixed form. Instead, it is based on the analysis of duct position changes during towing, thus possessing a certain degree of relevance and feasibility.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A device for towing ventilation ducts at the rear of an engineering vehicle, characterized in that, Includes mounting base, limit components, and locking components; The mounting base is fixedly connected to the rear of the engineering vehicle. The mounting base is provided with a limiting component for guiding the retraction and extension of the air duct. The limiting component includes two side plates arranged opposite each other. A detachable stop bar is connected between the two side plates to form a limiting space for accommodating the air duct and allowing the air duct to extend at both ends. The locking component is located above the two side plates and is used to lock the air duct on the mounting base and between the two side plates. The locking component includes a locking rod rotatably connected to one of the side plates and a fastener connected to the locking rod for detachably connecting to the other side plate.

2. The engineering vehicle rear-mounted ventilation duct device according to claim 1, characterized in that, The upper part of the mounting base is provided with an arc-shaped guide groove for supporting the air duct. The arc-shaped guide groove is located between the lower parts of the two side plates and together with the two side plates, it forms a space for supporting the air duct so that the air duct can be retracted or extended.

3. The engineering vehicle rear-mounted ventilation duct device according to claim 2, characterized in that, The mounting base is provided with a guide wheel for guiding the running direction of the air duct. The guide wheel is rotatably mounted on the mounting base and located behind the arc-shaped guide groove. The upper rim of the guide wheel is flush with the support position of the arc-shaped guide groove in the height direction.

4. The engineering vehicle rear-mounted ventilation duct device according to claim 1, characterized in that, One end of the locking rod is rotatably connected to one of the side plates via a hinge shaft, and the other end can cross the limiting space and abut against the other side plate. The fastener is a screw rod provided on the locking rod, and the screw rod can be screwed into the threaded hole on the side plate at one end and detachably connected to the locking rod.

5. The engineering vehicle rear-mounted ventilation duct device according to claim 1, characterized in that, The mounting base is provided with a base plate at its bottom end, and the base plate has mounting holes for connecting and fixing to the rear of the engineering vehicle with fasteners.

6. The engineering vehicle tail-mounted ventilation duct device according to any one of claims 1-3, characterized in that, The rear of the mounting base is also provided with a drum support assembly for winding and storing the air duct. The drum support assembly includes a drum and a support frame for mounting the drum. The drum is rotatably mounted on the support frame via a rotating shaft and bearing assembly. The bottom end of the support frame is detachably connected to the rear of the engineering vehicle, and the front end of the support frame is detachably connected to the rear end of the mounting base.

7. The engineering vehicle rear-mounted ventilation duct device according to claim 6, characterized in that, The two ends of the drum are respectively provided with side baffles for limiting the duct from sliding out. The side of the support frame is provided with a drive component for driving the drum to rotate. The drive component is a manual crank or a power input end connected to a power source, used to drive the drum to wind the duct when the duct is retracted.

8. The engineering vehicle rear-mounted ventilation duct device according to claim 3, characterized in that, The upper rim of the guide wheel is provided with an arc-shaped groove that matches the outer diameter of the air duct.

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