Side pulley device of aerial ladder, aerial ladder and fire fighting truck

Abstract

The utility model relates to the technical field of fire rescue equipment, in particular to a side pulley device of an aerial ladder, the aerial ladder and a fire fighting truck. The side pulley device comprises a fixing part used for fixing the side pulley device to a ladder frame of the aerial ladder; the pulley is rotatably arranged on the fixed part so as to limit the ladder frame in a sliding manner; the limiting part is arranged on the fixing part, a first limiting surface for limiting the ladder assembly is formed on the surface, close to the pulley, of the limiting part, and a limiting space for limiting the ladder assembly is defined by the pulley and the first limiting surface; wherein the axial direction of the pulley is the first direction, the limiting part is adjustably arranged on the fixing part in the second direction, and the second direction is perpendicular to the first direction. The side pulley device can limit the inner-layer ladder assembly from multiple directions, and the tipping risk of the inner-layer ladder assembly is reduced.

Description

Technical Field

[0001] This application relates to the field of fire rescue equipment, and more specifically, to a side pulley device for a fire ladder, a fire ladder, and a fire truck. Background Technology

[0002] Fire ladders are important rescue equipment mounted on fire trucks, used for personnel rescue and firefighting operations in emergencies such as high-rise building fires. Currently, fire ladders generally consist of multiple sections, with adjacent sections slidingly connected. For example, a 50-meter fire ladder consists of 6 sections, each approximately 10 meters long. When all 6 sections are deployed, the entire ladder reaches a length of 50 meters. When the ladder is retracted, the innermost section can be retracted into the outermost section.

[0003] To facilitate the sliding of the ladder frame, related technologies generally install a side pulley device between the inner side of the outer ladder frame and the outer side of the inner ladder frame to ensure the smooth sliding of the inner ladder frame.

[0004] However, the current side pulley system can only serve as a sliding guide and cannot improve the stability of the ladder frame during use, making its function relatively limited. Utility Model Content

[0005] A primary objective of this application is to overcome at least one of the deficiencies of the prior art and provide a side pulley device. This side pulley device can limit the inner ladder rack from multiple directions, reducing the risk of tipping over and improving the stability of the ladder rack during use.

[0006] Another main objective of this application is to overcome at least one of the deficiencies of the prior art and provide a fire ladder. This fire ladder has good stability, which helps to improve rescue efficiency.

[0007] Another primary objective of this application is to overcome at least one of the deficiencies of the prior art described above and to provide a fire truck. This fire truck has good stability, which helps to improve rescue efficiency.

[0008] To achieve the above-mentioned objectives, this application adopts the following technical solution:

[0009] According to one aspect of this application, a side pulley device for a fire ladder includes:

[0010] A fixing part is used to fix the side pulley device to the ladder frame of the fire ladder;

[0011] A pulley is rotatably mounted on the fixed part to slide and limit the ladder frame;

[0012] A limiting part is provided on the fixing part, and the surface of the limiting part near the pulley forms a first limiting surface for limiting the ladder frame. The pulley and the first limiting surface form a limiting space for limiting the ladder frame.

[0013] Wherein, the axial direction of the pulley is the first direction, and the limiting part is adjustablely disposed on the fixing part along the second direction, the second direction being perpendicular to the first direction.

[0014] According to one embodiment of this application, the circumferential sidewall of the pulley is exposed outside the fixing part, and the circumferential sidewall of the pulley and the first limiting surface form the limiting space.

[0015] According to one embodiment of this application, the fixing part includes a first fixing plate, a second fixing plate, and a support plate;

[0016] The first fixing plate and the second fixing plate are spaced apart along a first direction, and the support plate is disposed between the first fixing plate and the second fixing plate;

[0017] The pulley is disposed between the first fixed plate and the second fixed plate;

[0018] The first fixing plate is used to fix the side pulley device, and the limiting part is adjustablely disposed on the second fixing plate along the radial direction of the pulley.

[0019] According to one embodiment of this application, the limiting part includes an adjusting plate and a limiting block. The adjusting plate is adjustablely disposed on the second fixed plate, and the limiting block is disposed on the adjusting plate. The surface of the limiting block facing the pulley forms the first limiting surface.

[0020] According to one embodiment of this application, the adjusting plate includes a first plate segment and a second plate segment. An adjusting hole is provided on the first plate segment and the adjusting hole extends along the second direction. The side pulley device also includes a fastener, which passes through the adjusting hole and the second fixing plate. The limiting block is disposed on the second plate segment.

[0021] According to one embodiment of this application, the side pulley device further includes a driving member, the driving member is disposed on the second fixed plate, the adjusting plate is slidably connected to the second fixed plate, and the driving shaft of the driving member is drivenly connected to the adjusting plate to drive the adjusting plate to move along the second direction.

[0022] According to one embodiment of this application, in the second direction, the limiting block includes a first side surface near the pulley and a second side surface away from the pulley, the second side surface protruding from or flush with the adjusting plate, and the second side surface forming a second limiting surface for limiting the fire ladder.

[0023] According to one embodiment of this application, the pulley includes a shaft, a roller, and a wear-resistant sleeve;

[0024] The shaft passes through the first fixing plate and the second fixing plate;

[0025] The roller is sleeved on the shaft and located between the first fixing plate and the second fixing plate;

[0026] The wear-resistant sleeve is sandwiched between the shaft and the roller.

[0027] According to one embodiment of this application, the first end of the shaft extends through the second fixing plate;

[0028] The side pulley device also includes a pressure plate, which is fixedly connected to the first end of the shaft.

[0029] The limiting part is provided with a fixing groove, and the pressure plate extends into the fixing groove and is limited and engaged with the groove wall of the fixing groove.

[0030] According to another aspect of this application, a fire ladder includes:

[0031] The ladder frame structure includes a first ladder frame and a second ladder frame, wherein the second ladder frame is slidably disposed on the first ladder frame;

[0032] A side pulley device, wherein the fixed part of the side pulley device is fixedly connected to the first ladder frame, and the pulley of the side pulley device is in sliding limit cooperation with the second ladder frame; the limiting part of the side pulley device is in limit cooperation with the second ladder frame;

[0033] The side pulley device is the same as described above.

[0034] According to another aspect of this application, a fire truck includes:

[0035] Vehicle body;

[0036] A fire ladder is installed on the vehicle body, and the fire ladder is the aforementioned fire ladder.

[0037] An embodiment of the above application has at least the following advantages or beneficial effects:

[0038] The side pulley device of this application includes a fixing part, a pulley, and a limiting part. The fixing part is used to fix the side pulley device to the ladder frame of the fire ladder. The pulley is rotatably disposed on the fixing part to slide and limit the ladder frame. When the inner ladder frame slides, the pulley can limit the inner ladder frame and ensure the smooth sliding of the inner ladder frame. The limiting part is disposed on the fixing part, and the surface of the limiting part near the pulley forms a first limiting surface for limiting the ladder frame of the fire ladder. The pulley and the first limiting surface enclose a limiting space for limiting the ladder frame. Specifically, the first limiting surface is opposite to the inner ladder frame in a first direction to limit the inner ladder frame in the first direction. When the angle between the fire ladder and the ground is large and the inner ladder frame protrudes more than the outer ladder frame, the first limiting surface can cooperate with the inner ladder frame stop to reduce the risk of the inner ladder frame tipping over. The pulley is positioned opposite the inner ladder shelf in the second direction, thereby limiting the sliding of the second ladder shelf in the second direction and allowing it to slide in a predetermined direction. Furthermore, the limiting part is adjustablely positioned on the fixed part along the second direction. When the limiting part moves closer to the inner ladder shelf in the second direction, the effective limiting area of ​​the first limiting surface increases. When it moves away from the inner ladder shelf in the second direction, the effective limiting area of ​​the first limiting surface decreases. This arrangement allows for flexible adjustment of the limiting area of ​​the limiting part, enabling the operator to adjust the limiting area according to the actual distance between two adjacent ladder shelves to ensure effective limiting of the inner ladder shelf. Attached Figure Description

[0039] The various objectives, features, and advantages of this application will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of this application and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts.

[0040] Figure 1 This is a three-dimensional structural diagram of an embodiment of the fire ladder of this application;

[0041] Figure 2 yes Figure 1 A partial structural diagram of a fire ladder, in which... Figure 2 The first end of the fire ladder is shown;

[0042] Figure 3 yes Figure 1 A side view of a fire ladder, in which Figure 3 The first end of the fire ladder is shown;

[0043] Figure 4 This is a three-dimensional structural schematic diagram of the first embodiment of the side pulley device of this application;

[0044] Figure 5 yes Figure 4 A top view of the side pulley device;

[0045] Figure 6 yes Figure 4 A cross-sectional view of the side pulley device, wherein, Figure 6 The positional relationship between the side pulley device and the second ladder frame is shown;

[0046] Figure 7 yes Figure 1 A side view of a fire ladder, in which... Figure 7 The second end of the fire ladder is shown;

[0047] Figure 8 This is a three-dimensional structural schematic diagram of the second embodiment of the side pulley device of this application, wherein, Figure 8 The extended state of the limiting part is shown;

[0048] Figure 9 yes Figure 8 A three-dimensional structural diagram of the limiting part when it is in the retracted state;

[0049] Figure 10 This is a three-dimensional structural schematic diagram of the third embodiment of the side pulley device of this application;

[0050] Figure 11 yes Figure 10 Side view of the side pulley device.

[0051] The annotations in the attached figures are explained as follows:

[0052] 10. Fire ladder; 20. Side pulley system;

[0053] 100. Fixing part; 110. First fixing plate; 120. Second fixing plate; 130. Support plate;

[0054] 200. Pulley; 210. Shaft; 220. Roller; 221. Circumferential sidewall; 230. Wear-resistant sleeve; 240. Pressure plate;

[0055] 300, Limiting part; 310, Adjusting plate; 311, First plate segment; 3111, Adjusting hole; 3112, Fixing groove; 312, Second plate segment; 320, Limiting block; 321, First limiting surface; 322, Second limiting surface; 201, Limiting space; 330, Fastener;

[0056] 400. Drive components;

[0057] 500. Ladder structure; 501. First end; 502. Second end; 510. First ladder; 520. Second ladder; 530. Third ladder; 540. Fourth ladder; 550. Fifth ladder; 560. Sixth ladder;

[0058] 600. Sliding limit part; 610. Slide rail; 620. Slider;

[0059] D1, First Direction; D2, Second Direction; D3, Third Direction. Detailed Implementation

[0060] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0061] The features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0062] Because fire ladders are typically tilted at an angle relative to the ground during use, and the higher the floor to be rescued, the greater the extension height and the greater the tilt angle of the fire ladder. When the angle between the fire ladder and the ground is large and the inner ladder extends further than the outer ladder, the risk of the inner ladder tipping over increases significantly in the direction perpendicular to its extension, due to external factors such as wind.

[0063] In view of this, the side pulley device of this application can limit the inner ladder frame in the extension direction perpendicular to the ladder frame, so as to improve the stability of the fire ladder during use.

[0064] The following describes an embodiment of the fire ladder of this application with reference to the accompanying drawings.

[0065] The fire ladder 10 of this embodiment includes a ladder frame structure 500 and a side pulley device 20. For example... Figure 1 and Figure 2 As shown, the ladder structure 500 includes at least a first ladder 510 and a second ladder 520 arranged adjacent to each other, with the second ladder 520 slidably disposed on the first ladder 510. The ladder structure 500 has a first end 501 and a second end 502, and the second ladder 520 can extend from the first end 501 of the first ladder 510.

[0066] It should be noted that the side pulley device 20 can be set at the first end of the first ladder 510 to play a sliding limit role when the second ladder 520 slides relative to the first ladder 510.

[0067] It should also be noted that the ladder structure 500 may consist of more than two sections. The side pulley device 20 may be installed between any two adjacent ladder sections.

[0068] Taking a 50-meter fire ladder as an example, such as Figure 3 As shown, the ladder structure 500, in addition to the first ladder 510 and the second ladder 520, may also include a third ladder 530, a fourth ladder 540, a fifth ladder 550, and a sixth ladder 560. The first ladder 510 is the outermost ladder, the second ladder 520 is slidably connected to the first ladder 510, the third ladder 530 is slidably connected to the second ladder 520, and so on. Besides the side pulley device 20 that can be installed between the first ladder 510 and the second ladder 520, side pulley devices 20 can also be installed between the second ladder 520 and the third ladder 530, between the fourth ladder 540 and the fifth ladder 550, and between the fifth ladder 550 and the sixth ladder 560.

[0069] The first embodiment of the side pulley device is described below with reference to the accompanying drawings.

[0070] The side pulley device 20 of this embodiment includes: a fixing part 100, a pulley 200, and a limiting part 300.

[0071] like Figure 3 and Figure 4 As shown, the fixing part 100 is used to fix the side pulley device 20 to the ladder frame of the fire ladder 10. Specifically, the fixing part 100 can fix the side pulley device 20 to the outer ladder frame of two adjacent ladder frames. For example, the first ladder frame 510 and the second ladder frame 520 are two adjacent ladder frames, and the fixing part 100 is used to fix the side pulley device 20 to the first ladder frame 510. The second ladder frame 520 and the third ladder frame 530 are two adjacent ladder frames, and the fixing part 100 is used to fix the side pulley device 20 to the second ladder frame 520.

[0072] The pulley 200 is rotatably mounted on the fixed part 100 to slide and limit the ladder frame. When the inner ladder frame slides, the pulley 200 can limit the inner ladder frame and ensure the smooth sliding of the inner ladder frame.

[0073] Furthermore, such as Figure 4As shown, the circumferential sidewall 221 of the pulley 200 is exposed in the fixing part 100. The limiting part 300 is provided in the fixing part 100, and the surface of the limiting part 300 near the pulley 200 forms a first limiting surface 321 for limiting the ladder frame of the fire ladder 10. The circumferential sidewall 221 and the first limiting surface 321 form a limiting space 201 for limiting the ladder frame.

[0074] For ease of explanation, the axial direction of the pulley 200 is taken as the first direction D1, the width direction of the fire ladder 10 is taken as the second direction D2, and the length direction of the fire ladder 10 is taken as the third direction D3.

[0075] Specifically, the projection of the first limiting surface 321 in the first direction D1 at least partially overlaps with the inner ladder frame. In other words, the first limiting surface 321 is opposite to the inner ladder frame in the first direction D1, thereby limiting the inner ladder frame in the first direction D1. When the angle between the fire ladder 10 and the ground is large and the inner ladder frame extends further than the outer ladder frame, the first limiting surface 321 can cooperate with the inner ladder frame stop to reduce the risk of the inner ladder frame tipping over. The pulley 200 is opposite to the inner ladder frame in the second direction D2, thereby limiting the inner ladder frame in the second direction D2.

[0076] For example, please refer to Figure 3 The first ladder frame 510 and the second ladder frame 520 are two adjacent ladder frames. The side pulley device 20 is installed on the first ladder frame 510 through the fixing part 100, and the limiting part 300 extends along the second direction D2, thereby limiting the second ladder frame 520 in the first direction D1 to reduce the risk of the second ladder frame 520 tipping over. At the same time, the pulley 200 can slide and limit the second ladder frame 520 in the second direction D2, so that the second ladder frame 520 slides in a predetermined sliding direction.

[0077] Furthermore, the limiting part 300 is adjustablely positioned on the fixing part 100 along the second direction D2. When the limiting part 300 approaches the inner ladder shelf along the second direction D2, the area of ​​the projection of the first limiting surface 321 onto the inner ladder shelf in the first direction D1 increases, that is, the effective limiting area of ​​the first limiting surface 321 increases. When moving away from the inner ladder shelf along the second direction D2, the area of ​​the projection of the first limiting surface 321 onto the inner ladder shelf in the first direction D1 decreases, that is, the effective limiting area of ​​the first limiting surface 321 decreases. This arrangement allows the limiting area of ​​the limiting part 300 to be adjusted according to actual conditions to ensure the limiting effect on each layer of the ladder shelf.

[0078] like Figure 4As shown, in some embodiments of this example, the fixing part 100 includes a first fixing plate 110, a second fixing plate 120, and a support plate 130. The first fixing plate 110 and the second fixing plate 120 are spaced apart along a first direction D1, the support plate 130 is disposed between the first fixing plate 110 and the second fixing plate 120, and the pulley 200 is disposed between the first fixing plate 110 and the second fixing plate 120; the first fixing plate 110 is used to fix the side pulley device 20, and the limiting part 300 is adjustablely disposed on the second fixing plate 120 along the radial direction of the pulley 200.

[0079] The fixing part 100 serves as the mounting base for the pulley 200 and the limiting part 300, ensuring both the connection stability and smooth rotation of the pulley 200, and the connection stability and smooth adjustment of the limiting part 300.

[0080] Further, please continue to refer to Figure 4 In some embodiments of this example, the limiting part 300 includes an adjusting plate 310 and a limiting block 320. The adjusting plate 310 is adjustablely disposed on the second fixed plate 120, and the limiting block 320 is disposed on the adjusting plate 310. The surface of the limiting block 320 facing the pulley 200 forms a first limiting surface 321. The operator can adjust the limiting block 320 by moving the position of the adjusting plate 310, thereby changing the limiting area of ​​the side pulley device 20 on the inner ladder frame.

[0081] It should be noted that the limiting block 320 is made of a wear-resistant material. For example, the limiting block 320 is made of nylon.

[0082] like Figure 5 As shown, in some embodiments of this example, the adjusting plate 310 includes a first plate segment 311 and a second plate segment 312. The first plate segment 311 is used to connect with the second fixing plate 120. The second plate segment 312 is used to connect with the limiting block 320.

[0083] Specifically, the first plate segment 311 is provided with an adjustment hole 3111, which extends along the second direction D2. The side pulley device 20 also includes a fastener 330, which passes through the adjustment hole 3111 and the second fixed plate 120. A limiting block 320 is provided on the side of the second plate segment 312 facing the pulley 200. This arrangement makes the structure of the side pulley device 20 simple and the adjustment method of the limiting part 300 easy to operate. At the same time, the side pulley device 20 has strong structural stability and a longer service life.

[0084] For example, when it is necessary to increase the limiting area of ​​the side pulley device 20 on the inner ladder frame, the fastener 330 can be loosened first, and then the adjusting plate 310 can be pulled. Since the adjusting hole 3111 extends along the second direction D2, the adjusting plate 310 will extend along the second direction D2, and then the fastener can be screwed in. When it is necessary to reduce the limiting area of ​​the side pulley device 20 on the inner ladder frame, the fastener 330 can be loosened first, and then the adjusting plate 310 can be pushed. Since the adjusting hole 3111 extends along the second direction D2, the adjusting plate 310 will retract along the second direction D2, and then the fastener can be screwed in.

[0085] For example, fastener 330 can be a bolt.

[0086] Furthermore, such as Figure 6 As shown, in some embodiments of this example, the pulley 200 includes a shaft 210, a roller 220, and a wear-resistant sleeve 230.

[0087] Specifically, the shaft 210 passes through the first fixing plate 110 and the second fixing plate 120 to ensure the stability of the connection of the shaft 210.

[0088] Roller 220 is sleeved on shaft 210 and located between first fixed plate 110 and second fixed plate 120, with wear-resistant sleeve 230 sandwiched between shaft 210 and roller 220. Wear-resistant sleeve 230 is interference-fitted into the inner hole of roller 220, allowing it to rotate relative to shaft 210. When roller 220 rotates, wear-resistant sleeve 230 rubs against shaft 210. Wear-resistant sleeve 230 has better wear resistance, extending the service life of roller 220 and shaft 210, thereby extending the service life of side pulley device 20.

[0089] It should be noted that the wear-resistant sleeve 230 is made of wear-resistant material. For example, the wear-resistant sleeve 230 is made of copper.

[0090] like Figure 5 and Figure 6 As shown, in some embodiments of this example, the first end of the shaft 210 passes through the second fixing plate 120; the side pulley device 20 also includes a pressure plate 240, which is fixedly connected to the first end of the shaft 210; the limiting part 300 is provided with a fixing groove 3112, and the pressure plate 240 extends into the fixing groove 3112 and is limited and engaged with the groove wall of the fixing groove 3112.

[0091] The coordinated arrangement of the pressure plate 240 and the fixing groove 3112 enhances the stability of the shaft 210 connection. Specifically, when the roller 220 is impacted by the inner ladder frame, the impact force is transmitted to the shaft 210. Due to the pressure plate 240, which is further restrained by the groove wall of the fixing groove 3112, the probability of the shaft 210 loosening is effectively reduced, thus improving the structural strength of the side pulley device 20. Furthermore, Figure 7 The second end of the fire ladder is shown. (See image.) Figure 7 As shown, a sliding limit part 600 is also provided at the second end 502 of the fire ladder 10. The sliding limit part 600 includes a slide rail 610 and a slider 620. One of the slide rail 610 and the slider 620 can be provided on the inner ladder frame, and the other of the slide rail and the slider can be provided on the outer ladder frame. The slider 620 and the slide rail 610 can regulate the sliding direction of the inner ladder frame relative to the outer ladder frame, thereby further improving the stability of the inner ladder frame when sliding.

[0092] Please continue to refer to Figure 7 Taking the first ladder 510 and the second ladder 520 as examples, the slide rail 610 can be set on the second ladder 520, and the slider 620 can be set on the first ladder 510. The slider 620 is sleeved on the slide rail 610, and the slider 620 and the slide rail 610 are tightly fitted and can slide relative to each other, so that the second ladder 520 can extend or retract along the guide direction of the slide rail 610.

[0093] Of course, the arrangement of sliders and slide rails between other adjacent ladder sections can refer to the arrangement of the first ladder section 510 and the second ladder section 520, or the arrangement of sliders and slide rails can be changed. This embodiment will not elaborate further.

[0094] Furthermore, the fire ladder 10 may also include a retraction correction switch, which is used to detect whether the multi-section ladder frame has been retracted into place.

[0095] The fire ladder 10 may also include a guide rail extension detection switch and a guide rail retraction detection switch. Since the fire ladder 10 also carries a sliding car to facilitate personnel movement, the sliding car moves via the guide rails. However, there is often a certain distance between the second end of the fire ladder 10 and the ground, making it difficult for the sliding car to slide down to the ground. In this embodiment, the guide rail is designed as a movable structure; when the sliding car is not in use, the guide rail is in a retracted state. When the guide rail extends, the sliding car can slide down along the guide rail to the ground. The guide rail extension detection switch and the guide rail retraction detection switch can be used to detect whether the guide rail has extended to the correct position and whether it has retracted to the correct position.

[0096] This application also provides a second embodiment of the side pulley device 20, which differs from the first embodiment in the adjustment method of the limiting part 300. In the first embodiment, the limiting part 300 is adjusted manually. In the second embodiment, the limiting part 300 is adjusted automatically.

[0097] Specifically, such as Figure 8 and Figure 9As shown, the side pulley device 20 also includes a drive member 400, which is disposed on the second fixed plate 120. The adjusting plate 310 is slidably connected to the second fixed plate 120. The drive shaft of the drive member 400 is drivenly connected to the adjusting plate 310 to drive the adjusting plate 310 to move along the second direction D2.

[0098] Because of the driving component 400, when it is necessary to increase the limiting area of ​​the limiting part 300 on the inner ladder shelf, the driving component 400 can extend its driving end along the second direction D2 in response to the driving signal of the control device, thereby driving the adjusting plate 310 to move along the second direction D2, thus increasing the limiting area of ​​the limiting block 320 on the inner ladder shelf. Correspondingly, when it is necessary to decrease the limiting area of ​​the limiting part 300 on the inner ladder shelf, the driving component 400 can retract its driving end along the second direction D2 in response to the driving signal of the control device, thereby driving the adjusting plate 310 to move along the second direction D2, thus decreasing the limiting area of ​​the limiting block 320 on the inner ladder shelf. Using the driving component 400 to adjust the limiting part 300 effectively improves the adjustment efficiency of the limiting part 300.

[0099] In some embodiments of this example, in the second direction D2, the limiting block 320 includes a first side surface near the pulley 200 and a second side surface away from the pulley 200. The second side surface protrudes from or is flush with the adjusting plate 310, and forms a second limiting surface 322 for limiting the fire ladder 10. Figure 6 (As shown). Since the position of the limiting part 300 is adjusted by the driving component 400, in an emergency, such as when the steel wire rope driving the extension and retraction of the ladder frame breaks or the ladder frame falls, the driving component 400 can quickly push the limiting part 300 to the maximum displacement. At this time, the second limiting surface 322 of the limiting block 320 can abut against the inner ladder frame, generating a certain damping force, which plays a role in auxiliary locking and protection of the inner ladder frame.

[0100] For example, both sides of the inner ladder rack in the second direction D2 can be equipped with side pulley devices 20 to improve the limiting effect on the inner ladder rack.

[0101] This application also provides a third embodiment of the side pulley device 20. The difference between the third embodiment and the second embodiment is that multiple pulleys 200 can be provided to further improve the sliding limiting effect of the side pulley device 20 on the inner ladder.

[0102] Specifically, such as Figure 10 As shown, multiple pulleys 200 can be spaced apart on the fixing part 100 along a third direction. Correspondingly, multiple limiting parts 300 can also be provided corresponding to the pulleys. Alternatively, the length of the limiting part 300 along the third direction D3 can be increased to increase the limiting area of ​​the inner ladder frame.

[0103] It should also be noted that, such as Figure 10 As shown, in this embodiment, the first plate segment 311 can be slidably limited in conjunction with the pressure plate 240. Specifically, a limiting groove is provided between the pressure plate 240 and the second fixed plate 120, and the first plate segment 311 can be configured to cooperate with the limiting groove, so that the first plate segment 311 can slide along the second direction D2 without disengaging from the pressure plate 240 and the second fixed plate 120 along the first direction D1. Of course, the first plate segment 311 can also be slidably connected to the second fixed plate 120 in other forms.

[0104] This application also provides a fire truck, an embodiment of which includes: a vehicle body and a fire ladder 10. The fire ladder 10 is disposed on the vehicle body. Specifically, a lifting drive device may be provided between the fire ladder 10 and the vehicle body, and the drive end of the lifting drive device is drivenly connected to the first end of the fire ladder 10 so that the fire ladder 10 can be tilted to a predetermined angle.

[0105] Finally, it should be noted that the various embodiments / implementations provided in this application can be combined with each other without creating contradictions, and will not be described in detail here.

[0106] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0107] In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the application.

[0108] The above are merely preferred embodiments of the application examples and are not intended to limit the application examples. For those skilled in the art, the application examples can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the application examples should be included within the protection scope of the application examples.

Claims

1. A side pulley device for a fire ladder, characterized in that, include: A fixing part is used to fix the side pulley device to the ladder frame of the fire ladder; A pulley is rotatably mounted on the fixed part to slide and limit the ladder frame; A limiting part is provided on the fixing part, and the surface of the limiting part near the pulley forms a first limiting surface for limiting the ladder frame. The pulley and the first limiting surface form a limiting space for limiting the ladder frame. Wherein, the axial direction of the pulley is the first direction, and the limiting part is adjustablely disposed on the fixing part along the second direction, the second direction being perpendicular to the first direction.

2. The side pulley device according to claim 1, characterized in that, The circumferential sidewall of the pulley is exposed outside the fixing part, and the circumferential sidewall of the pulley and the first limiting surface form the limiting space.

3. The side pulley device according to claim 1, characterized in that, The fixing part includes a first fixing plate, a second fixing plate, and a support plate; The first fixing plate and the second fixing plate are spaced apart along a first direction, and the support plate is disposed between the first fixing plate and the second fixing plate; The pulley is disposed between the first fixed plate and the second fixed plate; The first fixing plate is used to fix the side pulley device, and the limiting part is adjustablely disposed on the second fixing plate along the radial direction of the pulley.

4. The side pulley device according to claim 3, characterized in that, The limiting part includes an adjusting plate and a limiting block. The adjusting plate is adjustablely disposed on the second fixed plate, and the limiting block is disposed on the adjusting plate. The surface of the limiting block facing the pulley forms the first limiting surface.

5. The side pulley device according to claim 4, characterized in that, The adjusting plate includes a first plate segment and a second plate segment. The first plate segment is provided with an adjusting hole that extends along the second direction. The side pulley device also includes a fastener that passes through the adjusting hole and the second fixing plate. The limiting block is provided on the second plate segment.

6. The side pulley device according to claim 4, characterized in that, The side pulley device further includes a driving component, which is disposed on the second fixed plate. The adjusting plate is slidably connected to the second fixed plate, and the driving shaft of the driving component is drivingly connected to the adjusting plate to drive the adjusting plate to move along the second direction.

7. The side pulley device according to claim 6, characterized in that, In the second direction, the limiting block includes a first side near the pulley and a second side away from the pulley, the second side protruding or flush with the adjusting plate, and the second side forming a second limiting surface for limiting the fire ladder.

8. The side pulley device according to any one of claims 3-7, characterized in that, The pulley includes a shaft, a roller, and a wear-resistant sleeve; The shaft passes through the first fixing plate and the second fixing plate; The roller is sleeved on the shaft and located between the first fixing plate and the second fixing plate; The wear-resistant sleeve is sandwiched between the shaft and the roller.

9. The side pulley device according to claim 8, characterized in that, The first end of the shaft passes through the second fixing plate; The side pulley device also includes a pressure plate, which is fixedly connected to the first end of the shaft. The limiting part is provided with a fixing groove, and the pressure plate extends into the fixing groove and is limited and engaged with the groove wall of the fixing groove.

10. A fire ladder, characterized in that, include: The ladder frame structure includes a first ladder frame and a second ladder frame, wherein the second ladder frame is slidably disposed on the first ladder frame; A side pulley device, wherein the fixed part of the side pulley device is fixedly connected to the first ladder frame, and the pulley of the side pulley device is in sliding limit cooperation with the second ladder frame; the limiting part of the side pulley device is in limit cooperation with the second ladder frame; Wherein, the side pulley device is the side pulley device according to any one of claims 1-9.

11. A fire truck, characterized in that, include: Vehicle body; A fire ladder is installed on the vehicle body, and the fire ladder is the fire ladder as described in claim 10.

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