High-altitude rescue fire engine frame lifting mechanism and gap adjustment maintenance method

Abstract

The present application relates to the technical field of fire engines, and particularly relates to a high-altitude rescue fire engine frame lifting mechanism and a gap adjusting and maintaining method, which comprises a chassis, a movable ladder hinged to the chassis, a lifting cylinder for driving the movable ladder to perform a pitching action, at least one lifting middle column, one end of the lifting middle column being rotationally connected to the chassis, the other end of the lifting middle column being rotationally connected to the movable ladder, the lifting middle column being configured as a multi-section telescopic structure and being capable of being telescopically extended or retracted following the pitching action of the movable ladder, and a gap adjusting component arranged on at least one telescopic rod of the lifting middle column and used for adjusting and limiting the fitting gap between the telescopic rods. The high-altitude rescue fire engine frame lifting mechanism effectively shares the gravity load of the movable ladder by additionally arranging the lifting middle column between the chassis and the movable ladder, and significantly increases the lateral rigidity. The left and right shaking and the torsion of the movable ladder during high-altitude operation can be greatly inhibited, and the stability and safety of the rescue platform are improved.

Description

Technical Field

[0001] This invention relates to the technical field of fire trucks, and more particularly to a lifting mechanism for a high-altitude rescue fire truck frame and a method for adjusting and maintaining clearance. Background Technology

[0002] Aerial rescue fire trucks are indispensable equipment in urban fire fighting and emergency rescue. They mainly rely on telescopic booms or ladders mounted on a chassis to transport rescue personnel and equipment to designated locations at high altitudes. Existing aerial rescue fire trucks typically use a single or double hydraulic cylinder to directly drive the movable ladder for pitch and boom operations.

[0003] However, with the increase in high-rise buildings and the continuous improvement of fire truck lifting heights, existing lifting mechanisms have gradually revealed some problems. Traditional lifting mechanisms mainly rely on the lifting cylinders at the bottom and the hinge points at the rear for support. When the ladder extends a long distance (e.g., more than 30 meters or higher), it acts like a huge cantilever beam. Under the influence of high-altitude wind loads, the reaction force of water cannon spray, or the movement of personnel, the ladder is prone to lateral swaying and torsion. This swaying not only seriously affects the accuracy of rescue but also causes intense panic among trapped personnel and rescuers, and may even lead to damage to the ladder structure due to fatigue or overload. Summary of the Invention

[0004] In view of the problem of insufficient ladder stability in the existing high-altitude rescue fire truck lifting mechanism, the present invention is proposed.

[0005] Therefore, one object of the present invention is to provide a high-altitude rescue fire truck frame lifting mechanism, the purpose of which is to improve the stability of the fire truck ladder and reduce swaying during use.

[0006] To address the aforementioned technical problem of insufficient ladder stability, this invention provides the following technical solution: a high-altitude rescue fire truck frame lifting mechanism, comprising a movable ladder hinged to a chassis, and a lifting cylinder for driving the pitching motion of the movable ladder, and further comprising at least one lifting center column, one end of which is rotatably connected to the chassis, and the other end of which is rotatably connected to the movable ladder. The lifting center column is configured as a multi-section telescopic structure, extending and retracting in accordance with the pitching motion of the movable ladder; wherein, at least one telescopic section of the lifting center column is provided with a gap adjustment component for adjusting and limiting the fitting gap between the telescopic sections.

[0007] As a preferred embodiment of the high-altitude rescue fire truck frame lifting mechanism of the present invention, wherein the lifting center column, the lifting cylinder, the chassis, and the movable ladder together form a triangular support structure.

[0008] As a preferred embodiment of the high-altitude rescue fire truck frame lifting mechanism of the present invention, the lifting center column includes two sets of telescopic rod assemblies arranged at intervals on the left and right, and at least one connecting beam is provided between the two sets of telescopic rod assemblies. The two ends of the connecting beam are respectively fixedly connected to the corresponding segments of the two sets of telescopic rod assemblies.

[0009] As a preferred embodiment of the high-altitude rescue fire truck frame lifting mechanism of the present invention, wherein: the gap adjustment component is disposed at the sleeve joint between the outer layer rod and the inner layer rod of the lifting center column; wherein, the gap adjustment component includes a mounting groove formed on the side wall of the outer layer rod, a guide member housed in the mounting groove and abutting against the outer wall of the inner layer rod, and a mounting plate disposed outside the outer layer rod and covering the mounting groove, the mounting plate being provided with an inwardly extending adjustment member.

[0010] As a preferred embodiment of the high-altitude rescue fire truck frame lifting mechanism of the present invention, the gap adjustment component further includes a pressure plate disposed inside the mounting groove. The pressure plate is located between the adjusting member and the guide member. The adjusting member passes through the mounting plate and abuts against the outer surface of the pressure plate. The inner surface of the pressure plate is in contact with the outer surface of the guide member.

[0011] As a preferred embodiment of the high-altitude rescue fire truck frame lifting mechanism of the present invention, a fixing plate is also fixedly provided around the mounting groove, the fixing plate is fixed to the outer wall of the outer rod, and the mounting plate is detachably connected to the fixing plate.

[0012] As a preferred embodiment of the high-altitude rescue fire truck frame lifting mechanism of the present invention, the adjusting component consists of at least two adjusting bolts arranged along the axial direction of the telescopic rod, and the mounting plate is provided with threaded holes that mate with the adjusting bolts.

[0013] As a preferred embodiment of the high-altitude rescue fire truck frame lifting mechanism of the present invention, the guide is a nylon liner, the guide is embedded in the mounting groove, and the inner side of the guide abuts against the outer surface of the inner rod.

[0014] As a preferred embodiment of the high-altitude rescue fire truck frame lifting mechanism of the present invention, the lifting column includes a first column connected to the chassis, a third column connected to the movable ladder, and a second column located between the first column and the third column. The third column is sleeved on the outside of the second column, and the second column is sleeved on the outside of the first column. The first column, the second column, and the third column are all rectangular tube structures, and the gap adjustment components are respectively disposed at the bottom end of the third column and the bottom end of the second column to limit the displacement of the internal rods.

[0015] As a preferred embodiment of the high-altitude rescue fire truck frame lifting mechanism of the present invention, wherein: the bottom end of the first column is provided with a rotating component, the rotating component is rotatably connected to the first column and fixedly connected to the chassis, the top end of the third column is provided with another rotating component, the other rotating component is rotatably connected to the third column and fixedly connected to the movable ladder.

[0016] Another objective of this invention is to provide a gap adjustment and maintenance method, which provides the following technical solution: the lifting column is kept in a telescopic connection state, the adjusting component is operated from the outside of the outer rod to generate a feed motion towards the inner rod; the pressure plate receives the thrust of the adjusting component and converts the thrust into surface contact pressure, uniformly pushing the guide component to adhere to the outer surface of the inner rod, thereby establishing frictional damping to prevent lateral swaying.

[0017] As a preferred embodiment of the gap adjustment and maintenance method of the present invention, the following steps are performed: the clamping state of the adjusting member is released; the mounting plate covering the outside of the mounting groove is removed to expose the mounting groove; the mounting groove serves as a maintenance window, the old guide member is directly removed and the new guide member is inserted; the mounting plate is re-covered and the adjustment steps are performed.

[0018] In a preferred embodiment of the gap adjustment and maintenance method of the present invention, the pressing depth of the pressure plate relative to the guide member is adjusted by adjusting the adjusting member, thereby correcting the parallelism between the pressure plate and the outer surface of the inner rod.

[0019] The beneficial effects of this invention are as follows: By adding a lifting column between the chassis and the movable ladder, the lifting column, main lifting cylinder, chassis, and movable ladder together form a triangular support structure. Compared to the traditional single-point supported cantilever structure, this effectively distributes the gravity load of the movable ladder and significantly increases lateral rigidity. It can greatly suppress the left-right swaying and torsion of the movable ladder during high-altitude operations, improving the stability and safety of the rescue platform.

[0020] This invention incorporates a gap adjustment component at the joint of the lifting column. The pressure plate transforms the point contact pressure of the adjusting bolt into surface contact pressure, preventing direct bolt contact from damaging the nylon guide component. This solves the problem of easily damaging the slider and extends the service life of the guide component. Furthermore, all adjustments can be performed externally by rotating the bolts, eliminating the need to disassemble the heavy lifting column and significantly reducing maintenance difficulty and cost. Through the use of multiple bolts, the preload of the guide component can be precisely adjusted, eliminating movement gaps and ensuring smooth extension and retraction.

[0021] This invention employs a dual-column parallel structure, with two sets of telescopic rod assemblies rigidly connected by a connecting beam. This design transforms the flexible single-column support into a gantry-type rigid frame. When the movable ladder experiences lateral wind loads or unbalanced loads that cause torsional tendencies, the connecting beam can transfer and cancel out the torque between the two telescopic rods, further enhancing wind resistance.

[0022] This invention preferably employs a three-section telescopic boom with an inverted, sleeved structure that is thicker at the top and thinner at the bottom. The three-section design ensures maximum lifting stroke while minimizing retracted length, fitting the limited chassis space of fire trucks and not interfering with the driver's cab. Simultaneously, the inverted telescopic structure ensures all sleeves face downwards, allowing water, foam, and dust to flow down the outer wall during firefighting operations, preventing them from entering the boom's interior. This effectively protects the internal tracks and sealing structures, improving the equipment's reliability in harsh environments. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall lifting mechanism of the high-altitude rescue fire truck of the present invention.

[0025] Figure 2 This is a schematic diagram of the lifting column of the high-altitude rescue fire truck frame lifting mechanism of the present invention.

[0026] Figure 3 This is a front view schematic diagram of the lifting column of the high-altitude rescue fire truck frame lifting mechanism of the present invention.

[0027] Figure 4 This is a cross-sectional schematic diagram of the clearance adjustment component of the high-altitude rescue fire truck frame lifting mechanism of the present invention.

[0028] Figure 5 This is a schematic diagram of the telescopic rod assembly of the lifting mechanism of the high-altitude rescue fire truck of the present invention.

[0029] Figure 6 This is a schematic diagram of each section of the telescopic rod assembly of the high-altitude rescue fire truck frame lifting mechanism of the present invention. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0033] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0034] Example 1

[0035] Reference Figure 1 This invention provides a high-altitude rescue fire truck frame lifting mechanism, which includes a chassis 100, a movable ladder 200 hinged to the chassis 100, and a lifting cylinder 500 for driving the pitching motion of the movable ladder 200. It also includes at least one lifting center column 300, one end of which is rotatably connected to the chassis 100, and the other end is rotatably connected to the movable ladder 200. The lifting center column 300 is configured as a multi-section telescopic structure, extending and retracting in accordance with the pitching motion of the movable ladder 200. At least one section of the telescopic rod of the lifting center column 300 is provided with a gap adjustment component 400 for adjusting and limiting the clearance between the sections of the telescopic rod.

[0036] Among them, the lifting column 300, the lifting cylinder 500, the chassis 100 and the movable ladder 200 together form a triangular support structure.

[0037] The chassis 100 serves as the overall mounting base, forming the frame or subframe of the fire truck and acting as a load-bearing device. The base of the movable ladder 200 is hinged to the rear of the chassis 100 or a turntable, enabling it to pitch around the hinge axis. The lifting cylinder 500 is located at the front of the chassis 100 and below the movable ladder 200. The bottom of the lifting cylinder 500 is rotatably connected to the chassis 100, and the top is rotatably connected to the head of the movable ladder 200. The lifting cylinder 500 acts as a power source to drive the movable ladder 200 to pitch.

[0038] The lifting column 300 is located near the lifting cylinder 500, serving as an auxiliary support and lateral limit.

[0039] During use, the bottom end of the lifting column 300 is rotatably connected to the chassis 100 via the rotating component 303, and the top end is also rotatably connected to the head of the movable ladder 200 via the rotating component 303. From the side projection, the lifting column 300, the chassis 100, and the movable ladder 200 together form a triangular support structure.

[0040] When the lifting cylinder 500 lifts the movable ladder 200, the shape of the triangular structure changes accordingly, but it remains stable. Compared to relying solely on the single-point support of the lifting cylinder 500, adding the lifting column 300 creates dual-point or multi-point support, greatly improving the ladder's anti-overturning ability and lateral rigidity during high-altitude operations.

[0041] To accommodate the lifting and lowering movements of the movable ladder 200, the lifting center column 300 is configured with a multi-section telescopic structure. The lifting center column 300 does not have an active driving force, but rather acts as a driven component, passively lengthening or compressing in response to the pitching and tilting movements of the movable ladder 200.

[0042] To prevent the multi-section telescopic rod from swaying after extension, at least one section of the lifting center column 300 is provided with a gap adjustment component 400, which is used to adjust and limit the fit gap between each section of the telescopic rod, eliminate the play caused by manufacturing tolerances or long-term wear, and ensure that the lifting center column 300 still has good straightness and rigidity in the fully extended state.

[0043] Example 2

[0044] Reference Figures 2-3 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the lifting center column 300 includes two sets of telescopic rod assemblies 301 arranged at intervals on the left and right. At least one connecting beam 302 is provided between the two sets of telescopic rod assemblies 301. The two ends of the connecting beam 302 are respectively fixedly connected to the corresponding segments of the two sets of telescopic rod assemblies 301.

[0045] Two sets of telescopic rod assemblies 301 are parallel to each other and are arranged on both sides of the chassis 100. Each set of telescopic rod assemblies 301 is rotatably connected to the chassis 100 and the movable ladder 200. In order to prevent the two independent telescopic rod assemblies 301 from being relatively displaced or out of sync when subjected to force, a connecting beam 302 is provided between the two sets of telescopic rod assemblies 301. The two ends of the connecting beam 302 are fixedly connected to the corresponding segments of the left and right sets of telescopic rod assemblies 301, for example, they are both connected to the top of the telescopic rod assembly 301, or they are both connected to a certain telescopic joint, as long as it does not affect the telescopic movement.

[0046] Furthermore, in addition to using a simple crossbeam, the connecting beam 302 can also be configured as an X-shape or other shapes that can provide reinforcement. Connecting the connecting beam 302 to the two sets of telescopic rod assemblies 301 together forms a gantry-type rigid frame. When the movable ladder 200 is subjected to lateral wind loads or unbalanced loads causing a torsional tendency, the connecting beam 302 can transfer and cancel the torque between the two telescopic rods, thereby locking the torsional degree of freedom.

[0047] The left and right telescopic rod assemblies 301 passively follow the extension and retraction of the movable ladder 200. Since their top ends are both hinged to the same rigid movable ladder 200 and are rigidly constrained by the connecting beam 302, the two telescopic rod assemblies 301 can maintain height synchronization.

[0048] The remaining structure is the same as that in Example 1.

[0049] Example 3

[0050] Reference Figure 3 and Figure 4 This is the third embodiment of the present invention, which differs from the second embodiment in that: the gap adjustment component 400 is disposed at the sleeve joint between the outer and inner rods of the lifting column 300; wherein, the gap adjustment component 400 includes a mounting groove 401 formed on the side wall of the outer rod, a guide member 402 housed in the mounting groove 401 and abutting against the outer wall of the inner rod, and a mounting plate 403 disposed outside the outer rod and covering the mounting groove 401, and an inwardly extending adjustment member 404 provided on the mounting plate 403.

[0051] To effectively guide and limit the internal telescopic rod, a gap adjustment component 400 is installed at the connection between the outer and inner rods of the lifting column 300, typically located at the bottom opening of the outer rod. A through mounting groove 401 is provided on the side wall of the outer rod. The mounting groove 401 serves as the operating port for the gap adjustment component 400, allowing external operations to directly affect the inner rod.

[0052] Furthermore, the gap adjustment component 400 also includes a pressure plate 405 disposed inside the mounting groove 401. The pressure plate 405 is located between the adjusting component 404 and the guide component 402. The adjusting component 404 passes through the mounting plate 403 and abuts against the outer surface of the pressure plate 405. The inner surface of the pressure plate 405 is in contact with the outer surface of the guide component 402.

[0053] A fixing plate 406 is also fixed around the mounting slot 401. The fixing plate 406 is fixed to the outer wall of the outer rod, forming a reinforcing frame structure protruding from the surface of the outer rod. The mounting plate 403 is detachably connected to the fixing plate 406. The fixing plate 406 is welded around the mounting slot 401 as a mounting base, forming a reinforcing frame structure protruding from the surface of the outer rod, compensating for the reduction in the strength of the tube structure caused by the mounting slot 401.

[0054] The adjusting component 404 consists of at least two adjusting bolts 404a arranged axially along the telescopic rod. The mounting plate 403 has threaded holes 404b that mate with the adjusting bolts 404a. The mounting plate 403 is detachably attached to the fixing plate 406 by screws. As the base of the clearance adjusting component 400, it has several threaded holes 404b. The adjusting bolts 404a are then installed through the threaded holes 404b on the mounting plate 403. The at least two adjusting bolts 404a are provided to better control the pressure applied by the pressure plate 405, preventing the pressure plate 405 from tilting and causing uneven force applied to the guide component 402, thus affecting friction damping.

[0055] The guide element 402 is a nylon liner, which is embedded in the mounting groove 401. The inner side of the guide element 402 abuts against the outer surface of the inner rod. The nylon liner has self-lubricating properties and good wear resistance, which can reduce wear on the metal surface of the inner rod.

[0056] The pressure plate 405 is located in the mounting groove 401, between the end of the adjusting bolt 404a and the guide member 402. It converts the point contact pressure of the adjusting bolt 404a into surface contact pressure and transmits it evenly to the internal guide member 402. The inner side of the guide member 402 is tightly attached to the outer surface of the inner rod. The edge of the guide member 402 can also be provided with a step or flange to prevent it from coming out of the mounting groove 401.

[0057] After the lifting column 300 has been used for a period of time, wear of the nylon liner may cause an increase in the clearance between the parts. Alternatively, during the initial assembly when damping adjustment is required, the operator can use a wrench to rotate the external adjusting bolt 404a. The adjusting bolt 404a is pushed inward, pressing against the outer surface of the pressure plate 405. The pressure plate 405 moves inward as a whole, applying a uniform thrust to the back of the guide member 402. The guide member 402 is forced to move inward, eliminating the physical gap between itself and the inner rod and generating appropriate preload. If the adjustment is too tight, the lifting column 300 will feel noticeably stiff; if the adjustment is too loose, the lifting column 300 will wobble noticeably.

[0058] The remaining structure is the same as that in Example 2.

[0059] Example 4

[0060] Reference Figure 5 and Figure 6 This is the fourth embodiment of the present invention, which differs from the third embodiment in that: the lifting column 300 includes a first column 301a connected to the chassis 100, a third column 301c connected to the movable ladder 200, and a second column 301b located between the first column 301a and the third column 301c. The third column 301c is sleeved on the outside of the second column 301b, and the second column 301b is sleeved on the outside of the first column 301a. The first column 301a, the second column 301b, and the third column 301c are all rectangular tube structures, and the gap adjustment component 400 is respectively disposed at the bottom end of the third column 301c and the bottom end of the second column 301b to limit the displacement of the internal rods.

[0061] The lifting center column 300 is preferably configured as a three-section telescopic structure. Compared to a two-section structure, the three-section structure is shorter when fully retracted, which can fit into the limited installation space of the fire truck chassis 100, without interfering with the driver's cab or equipment box, and the movable ladder 200 can be fully lowered. Compared to a four-section structure, the three-section structure has fewer connection points, less cumulative sway, and greater rigidity.

[0062] The third column 301c is fitted onto the outside of the second column 301b, and the second column 301b is fitted onto the outside of the first column 301a. That is, the uppermost pipe has the largest diameter, and the lowermost pipe has the smallest diameter. This inverted structure ensures that the joints of each telescopic rod face downwards. During firefighting operations, water, foam, and dust will flow down the outer wall of the pipe, making it difficult for them to enter the telescopic rod, thus protecting the internal sliding channels and sealing structure.

[0063] refer to Figure 5 and Figure 6 Let the width of the first column 301a be W1, the width of the second column 301b be W2, and the width of the third column 301c be W3, where W3 > W2 > W1. Let the length of the first column 301a be L1, the length of the second column 301b be L2, and the length of the third column 301c be L3, where L1 > L2 > L3. Furthermore, to prevent the relatively thinner bottom column 301a from breaking and to enhance its strength, the wall thickness of the first column 301a is increased, slightly greater than the wall thickness of the second column 301b and the third column 301c.

[0064] In a specific test example, the first column 301a has a length L1 = 1720 mm, a width W1 = 160 mm, and a wall thickness of 8 mm. The second column 301b has a length L2 = 1610 mm, a width W2 = 180 mm, and a wall thickness of 6 mm. The third column 301c has a length L3 = 1455 mm, a width W3 = 200 mm, and a wall thickness of 6 mm.

[0065] The width difference between the third post 301c and the second post 301b is 20mm, and the gap on one side is about 10mm. The width difference between the second post 301b and the first post 301a is also 20mm. This gap space is used to accommodate the pressure plate 405 and the guide 402 of the gap adjustment component 400, so that the gap adjustment component 400 can be compactly integrated into the cross section of the rod.

[0066] The gradient fit in length ensures that sufficient overlap remains between sections even when fully extended. This overlap, in conjunction with the gap adjustment component 400, forms a stable two-point support effect, effectively resisting lateral wind loads during high-altitude operations.

[0067] The first column 301a has a rotating component 303 at its bottom end, which is rotatably connected to the first column 301a and fixedly connected to the chassis 100. The third column 301c has another rotating component 303 at its top end, which is rotatably connected to the third column 301c and fixedly connected to the movable ladder 200. By setting rotating components 303 at both ends of the lifting column 300, the movable ladder 200 moves synchronously with the column during pitching motion. The rotating components 303 only allow the lifting column 300 to rotate in the pitch plane, restricting lateral swaying. The rotating component 303 can be a rotating shaft 303a and a rotating seat rotatably connected to the rotating shaft 303a. The rotating seat is fixedly connected to the lifting column 300 and, as needed, is also fixedly connected to the chassis 100 or the movable ladder 200, thus enabling the lifting column 300 to rotate synchronously.

[0068] The remaining structure is the same as that in Example 3.

[0069] Example 5

[0070] This embodiment also provides a gap adjustment and maintenance method, including keeping the lifting column 300 in a telescopic connection state, and operating the adjusting component 404 from the outside of the outer rod to make it feed towards the inner rod;

[0071] The pressure plate 405 receives the thrust of the adjusting member 404 and converts the thrust into surface contact pressure, which uniformly pushes the guide member 402 to adhere to the outer surface of the inner rod, thus establishing frictional damping to prevent lateral swaying.

[0072] First, ensure the high-altitude rescue fire truck is stationary, and place the lifting center column 300 in a telescopic connection state, such as half-extended or fully extended, to facilitate the detection of the amount of sway between sections and to determine whether the damping is too large.

[0073] Without disassembling the lifting column 300, the operator uses a tool to rotate the adjusting component 404 from the outside of the outer rod. Driving the adjusting component 404 causes it to feed inwards towards the inner rod, i.e., rotate inwards. At this time, the pressure plate 405 located inside the mounting groove 401 receives the thrust from the end of the adjusting component 404. Utilizing the rigidity of the pressure plate 405, the point contact thrust applied by the adjusting component 404 is converted into surface contact pressure. The pressure plate 405 moves inwards as a whole, evenly pushing the guide component 402 to press against the outer surface of the inner rod. As the pressure increases, the physical gap between the guide component 402 and the inner rod is eliminated, and appropriate frictional damping is established, thereby preventing lateral swaying of the lifting column during extension and retraction. The connections of each section of the telescopic rod are checked to confirm whether there is any obvious lateral loosening or abnormal noise. If the frictional damping is too large, resulting in poor extension and retraction, the adjusting component 404 is rotated in the opposite direction to loosen the pressure plate 405, thereby reducing the frictional damping between the guide component 402 and the inner rod to a suitable range.

[0074] Furthermore, it also includes releasing the clamping state of the adjusting component 404;

[0075] Remove the mounting plate 403 covering the outside of the mounting slot 401 to expose the mounting slot 401;

[0076] Mounting slot 401 serves as a maintenance window, allowing the old guide 402 to be directly removed and the new guide 402 to be inserted.

[0077] Re-cover mounting plate 403 and perform adjustment steps.

[0078] The adjusting member 404 is rotated in the opposite direction to disengage it from the pressed state and stop pressing against the pressure plate 405. Since the mounting plate 403 is detachably mounted on the fixing plate 406 by bolts, the mounting plate 403 can be opened by removing the bolts. The mounting plate 403 covering the mounting groove 401 is then removed. At this point, the mounting groove 401 on the side wall of the outer rod is exposed, forming an open maintenance window. Through this maintenance window, the worn old guide member 402 can be directly removed, and a new guide member 402 can be embedded into the mounting groove 401. The mounting plate 403 is then re-secured to the fixing plate 406 with screws, and the above adjustment steps are repeated until the new guide member 402 reaches the appropriate preload.

[0079] The clamping depth of the pressure plate 405 relative to the guide member 402 is adjusted by adjusting the adjusting component 404, thereby correcting the parallelism between the pressure plate 405 and the outer surface of the inner rod. Since the adjusting component 404 is typically configured with at least two axially arranged adjusting bolts 404a, a parallelism correction step can also be performed during the adjustment process. The operator can adjust the tilt angle of the pressure plate 405 relative to the surface of the inner rod by fine-tuning the screw depth of the adjusting bolts 404a at different positions. This ensures that the pressure plate 405 remains parallel to the outer surface of the inner rod, thereby ensuring uniform force on the guide member 402 and preventing excessive local pressure from causing telescopic jamming or uneven wear of the guide member 402.

[0080] To verify the impact of the above parallelism correction steps on the operational stability of the lifting center column 300 under high load conditions, a set of comparative tests were conducted in this embodiment. The tests used heavy-duty fire truck lifting center columns 300 of the same model and specifications, and the test environment simulated the fully extended state of the entire vehicle (30 meters in height).

[0081] The experimental load conditions were as follows: a rated working load of 400 kg was applied to the end of the movable ladder 200 to simulate 3 rescuers and equipment, and a lateral load of 500 N was applied to put the lifting column 300 under stress.

[0082] In the comparison setting, the control group (without parallelism correction) showed a slight difference in the screw-in depth of the two adjusting bolts 404a, namely, a depth difference of 1.5mm between the two adjusting bolts 404a. This resulted in the pressure plate 405 forming an inclined angle of about 1.2° with the surface of the inner rod, and the guide 402 making contact with a single-sided edge.

[0083] Experimental group (parallelism correction): By fine-tuning the adjusting bolt 404a, the pressure plate 405 is made parallel to the surface of the inner rod, with an inclination angle of <0.1°, and the guide 402 is in full-plane contact.

[0084] Under the aforementioned high-load conditions, 500 full-stroke reciprocating telescopic durability tests were conducted to simulate approximately 3-5 years of high-frequency use and wear. The wear of the guide component 402 during the telescopic process was recorded. The test data are shown in the table below:

[0085]

[0086] As shown in the table above, under high load and lateral wind load conditions, by implementing the parallelism correction steps described in this embodiment, the wear rate of the guide component was reduced by 75%, and the end sway was significantly reduced. Simultaneously, the wear of the guide component became more uniform, the degree of wear was less, and its service life was significantly extended.

[0087] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise changed, and the nature or number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. Therefore, the invention is not limited to the particular embodiments but extends to a variety of modifications that still fall within the scope of the appended claims.

[0088] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0089] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A lifting mechanism for a high-altitude rescue fire truck frame, comprising a movable ladder (200) hinged to a chassis (100) and a lifting cylinder (500) for driving the movable ladder (200) to pitch, characterized in that: It also includes at least one lifting column (300), one end of which is rotatably connected to the chassis (100) and the other end is rotatably connected to the movable ladder (200). The lifting column (300) is configured as a multi-section telescopic structure and extends and retracts in accordance with the pitching motion of the movable ladder (200). Wherein, at least one section of the telescopic rod of the lifting center column (300) is provided with a gap adjustment component (400) for adjusting and limiting the fitting gap between each section of the telescopic rod; The gap adjustment component (400) is located at the joint between the outer and inner rods of the lifting column (300); The gap adjustment component (400) includes a mounting groove (401) formed on the side wall of the outer rod, a guide (402) housed in the mounting groove (401) and abutting against the outer wall of the inner rod, and a mounting plate (406) disposed outside the outer rod and covering the mounting groove (401), wherein the mounting plate (406) is provided with an inwardly extending adjustment component (404). The gap adjustment component (400) further includes a pressure plate (405) disposed inside the mounting groove (401), the pressure plate (405) being located between the adjustment component (404) and the guide component (402); The lifting column (300) includes a first column (301a) connected to the chassis (100), a third column (301c) connected to the movable ladder (200), and a second column (301b) located between the first column (301a) and the third column (301c). The first column (301a) is provided with a rotating part (303) at its bottom end. The rotating part (303) is rotatably connected to the first column (301a) and fixedly connected to the chassis (100). The third column (301c) is provided with another rotating part (303) at its top end. The other rotating part (303) is rotatably connected to the third column (301c) and fixedly connected to the movable ladder (200).

2. The high-altitude rescue fire truck frame lifting mechanism according to claim 1, characterized in that: The lifting column (300), lifting cylinder (500), chassis (100), and movable ladder (200) together form a triangular support structure.

3. The high-altitude rescue fire truck frame lifting mechanism according to claim 2, characterized in that: The lifting center column (300) includes two sets of telescopic rod assemblies (301) spaced apart on the left and right sides. At least one connecting beam (302) is provided between the two sets of telescopic rod assemblies (301). The two ends of the connecting beam (302) are respectively fixedly connected to the corresponding segments of the two sets of telescopic rod assemblies (301).

4. The high-altitude rescue fire truck frame lifting mechanism according to claim 3, characterized in that: The adjusting member (404) passes through the mounting plate (406) and abuts against the outer surface of the pressure plate (405), and the inner surface of the pressure plate (405) is in contact with the outer surface of the guide member (402).

5. The high-altitude rescue fire truck frame lifting mechanism according to claim 4, characterized in that: A fixing plate (403) is also fixed around the mounting groove (401). The fixing plate (403) is fixed to the outer wall of the outer rod body. The mounting plate (406) is detachably connected to the fixing plate (403).

6. The high-altitude rescue fire truck frame lifting mechanism according to claim 4 or 5, characterized in that: The adjusting component (404) consists of at least two adjusting bolts (404a) arranged along the axial direction of the telescopic rod, and the mounting plate (406) has threaded holes (404b) that mate with the adjusting bolts (404a).

7. The high-altitude rescue fire truck frame lifting mechanism according to claim 6, characterized in that: The guide (402) is a nylon liner, which is embedded in the mounting groove (401). The inner side of the guide (402) abuts against the outer surface of the inner rod.

8. The high-altitude rescue fire truck frame lifting mechanism according to any one of claims 1 to 5 and 7, characterized in that: The third post (301c) is sleeved on the outside of the second post (301b), and the second post (301b) is sleeved on the outside of the first post (301a); The first column (301a), the second column (301b), and the third column (301c) are all rectangular tube structures, and the gap adjustment component (400) is respectively disposed at the bottom end of the third column (301c) and the bottom end of the second column (301b) to limit the displacement of the internal rod.

9. A gap adjustment and maintenance method, applicable to the high-altitude rescue fire truck frame lifting mechanism as described in any one of claims 1 to 8, characterized in that: include, The lifting center column (300) remains in a telescopic connection state, and the adjustment component (404) is operated from the outside of the outer rod to generate a feeding motion towards the inner rod; The pressure plate (405) receives the thrust of the adjusting member (404) and converts the thrust into surface contact pressure, which uniformly pushes the guide member (402) to adhere to the outer surface of the inner rod, thereby establishing frictional damping to prevent lateral swaying.

10. The gap adjustment and maintenance method according to claim 9, characterized in that: It also includes, Release the clamping state of the adjusting component (404); Remove the mounting plate (406) covering the outside of the mounting slot (401) to expose the mounting slot (401); The mounting slot (401) serves as a maintenance window, allowing the old guide (402) to be removed directly and the new guide (402) to be inserted. Re-cover the mounting plate (406) and perform the adjustment steps.

11. The gap adjustment and maintenance method according to claim 9 or 10, characterized in that: The pressing depth of the pressure plate (405) relative to the guide (402) is adjusted by adjusting the adjusting member (404), thereby correcting the parallelism between the pressure plate (405) and the outer surface of the inner rod.

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