Trolley goods shelf locking device, vehicle-mounted scaling ladder and scaling ladder vehicle

Abstract

The utility model belongs to the technical field of scaling ladder trucks, and particularly discloses a trolley goods shelf locking device, a vehicle-mounted scaling ladder and a scaling ladder truck, and the trolley goods shelf locking device comprises a trolley goods shelf, a trolley underframe, an air spring, an outer supporting frame, an inner supporting frame, a handle and a locking rod. Simpler and more convenient manual mechanical connection is adopted. According to the lever principle, the handle drives the locking rod and the locking pin to move with the hinged position of the handle and the outer supporting frame as a fulcrum, when external force is applied, the locking pin is separated from the locking hole in the inner supporting frame, the inner supporting frame can stretch out or retract relative to the outer supporting frame, and then the angle between the trolley goods shelf and the trolley bottom frame is changed. After the external force is removed, the spring provides resilience force, and the locking pin is inserted into the locking hole to achieve locking. The gravity of the trolley goods shelf is overcome through the air spring, it is guaranteed that the posture of the trolley goods shelf can be manually adjusted, operation is easy and convenient, and the manufacturing cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of ladder trucks, and in particular to a trolley shelf locking device, a vehicle-mounted ladder and a ladder truck. Background Art

[0002] As a specialized vehicle, ladder trucks offer high flexibility and efficiency, making them widely used in cargo handling, firefighting, equipment installation, and maintenance. Ladder trucks are equipped with a material-carrying trolley, a shelf for placing materials, and a pulley undercarriage. The trolley moves along the onboard ladder, fulfilling the requirements of high-altitude transport operations.

[0003] When the material-carrying trolley is not in use, the trolley shelf needs to be placed close to the trolley chassis to make it compact and convenient for the ladder truck to travel. Before the material-carrying trolley is put into use (loading materials for upward transportation), the trolley shelf needs to be adjusted to a horizontal position. During operation, the angle of the trolley shelf relative to the trolley chassis also needs to be adjusted according to the angle between the vehicle-mounted ladder and the ground. Therefore, a trolley shelf locking device is required to adjust the trolley shelf posture and keep it horizontal during the material transportation process. Existing ladder trucks generally use hydraulic cylinders to adjust the angle of the trolley shelf relative to the ground, but this method requires the use of hydraulic control and electrical control in conjunction with each other, so the manufacturing cost is relatively high. In addition, the trolley shelf locking device using a hydraulic cylinder also needs to be used in conjunction with a remote control when in use, and the operation is also relatively cumbersome.

[0004] It can be seen from this that the structure of the trolley shelf locking device in the prior art needs to be further improved. Utility Model Content

[0005] The purpose of the utility model is to propose a trolley shelf locking device, which uses manual mechanical connection instead of hydraulic control to adjust the position of the trolley shelf, and uses the elastic force of the spring to keep the trolley shelf in a locked state. The overall weight is lighter and the operation is more convenient.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A trolley shelf locking device comprises a trolley shelf, a trolley chassis, a gas spring, an outer support frame, an inner support frame, a handle and a locking rod;

[0008] The trolley rack is hinged to the trolley chassis;

[0009] One end of the gas spring is hinged to the trolley shelf, and the other end of the gas spring is hinged to the trolley chassis;

[0010] The upper end of the outer support frame is hinged to the trolley shelf, and the lower end of the inner support frame is hinged to the trolley chassis. The inner support frame is slidably connected to the outer support frame. The inner support frame can be extended or retracted relative to the outer support frame. A plurality of locking holes are provided on the inner support frame along the length direction.

[0011] The middle part of the handle is hinged to the outer support frame, the lower end of the handle is hinged to the lock rod, the lock rod is set on the outer support frame, a spring is set between the lock rod and the outer support frame, and a locking pin is set at the end of the lock rod;

[0012] The handle overcomes the elastic force of the spring under the action of external force, so that the locking pin is separated from the locking hole; when the external force is removed, the locking rod is inserted into the locking hole under the action of the elastic force of the spring.

[0013] Preferably, the locking pin includes a first locking pin and a second locking pin arranged in parallel;

[0014] A first locking pin is provided at one end of the locking rod, and the first locking pin is engaged with a locking hole on the left side of the inner support frame;

[0015] The second locking pin is arranged at the other end of the locking rod, and the second locking pin cooperates with the locking hole on the right side of the inner support frame.

[0016] Preferably, a protective cover is provided on the outer support frame;

[0017] The locking rod is installed inside the protective cover, the locking rod passes through the guide plate inside the protective cover, and the locking pin extends to the outside of the protective cover.

[0018] Preferably, the guide plate includes a first guide plate and a second guide plate;

[0019] The lock rod is provided with a first retaining ring and a second retaining ring, the first retaining ring is located between the first guide plate and the second guide plate, and the second retaining ring is located on a side of the second guide plate away from the first guide plate;

[0020] One end of the spring is connected to the first guide plate, and the other end of the spring is connected to the first retaining ring.

[0021] Preferably, a limiting sleeve is provided on the outer support frame, and the locking pin passes through the limiting sleeve.

[0022] Preferably, a first upper hinge seat is provided at the front end of the lower portion of the trolley shelf, a second upper hinge seat is provided at the rear end of the lower portion of the trolley shelf, and a third upper hinge seat is provided at the middle rear position of the lower portion of the trolley shelf;

[0023] A first lower hinge seat is provided at the front end of the upper part of the trolley chassis, a second lower hinge seat is provided at the rear end of the upper part of the trolley chassis, and a third lower hinge seat is provided at the middle position of the upper part of the trolley chassis;

[0024] The first upper hinge seat is hinged to the first lower hinge seat;

[0025] The upper end of the outer support frame is hinged to the second upper hinge seat, and the lower end of the inner support frame is hinged to the second lower hinge seat;

[0026] The upper end of the gas spring is hinged to the third upper hinge seat, and the lower end of the gas spring is hinged to the third lower hinge seat.

[0027] Preferably, the gas spring comprises a pressure cylinder and a telescopic rod slidably connected to the pressure cylinder;

[0028] The telescopic rod is provided with a first hinge joint, which is hinged to the third upper hinge seat;

[0029] The pressure cylinder is provided with a second hinged joint, which is hinged to the third lower hinged seat.

[0030] Preferably, the gas springs are provided in plurality.

[0031] A vehicle-mounted aerial ladder is provided with the above-mentioned trolley shelf locking device.

[0032] A ladder truck is provided with the above-mentioned vehicle-mounted ladder.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] As described above, the present invention relates to a trolley rack locking device that is assembled on a vehicle-mounted aerial ladder and applied to a ladder truck. The trolley rack locking device adopts a simpler and more convenient manual mechanical connection. It utilizes the principle of leverage, with the hinged joint between the handle and the outer support frame as the fulcrum, to drive the locking pin out of the locking hole on the inner support frame. The inner support frame is then extended or retracted relative to the outer support frame to change the position of the trolley rack. The device uses a spring to provide rebound force, and the locking rod drives the locking pin to insert into the locking hole to achieve locking of the trolley rack. The gas spring is used to overcome the gravity of the trolley rack itself, ensuring that the position adjustment of the trolley rack can be completed manually. It is not only easy to operate but also has low manufacturing costs. In addition, the trolley shelf locking device of the utility model also has good reliability and durability. The limit sleeve is used to extend the distance that the locking pin is allowed to be pulled out to avoid the inability to adjust due to processing errors; the second guide plate in the protective cover cooperates with the second retaining ring on the locking rod to limit the distance that the locking pin is pulled out. The maximum installation distance of the gas spring ensures that the outer support frame and the inner support frame will not fall off due to lifting transition, making the device safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0036] Figure 1 This is a schematic structural diagram of a trolley shelf locking device according to an embodiment of the present utility model;

[0037] Figure 2 This is a schematic structural diagram of the outer support frame, inner support frame, handle and locking rod in an embodiment of the present utility model;

[0038] Figure 3 This is a front view of the trolley shelf locking device in the embodiment of the utility model when the support frame is extended;

[0039] Figure 4 This is a side view of the trolley shelf locking device in the embodiment of the utility model when the support frame is extended;

[0040] Figure 5 This is a front view of the trolley shelf locking device when the support frame is retracted in the embodiment of the utility model;

[0041] Figure 6 A side view of the trolley shelf locking device according to an embodiment of the present invention when the support frame is retracted;

[0042] Figure 7 This is a front view of an external support frame according to an embodiment of the present utility model;

[0043] Figure 8 This is a side view of an external support frame according to an embodiment of the present utility model;

[0044] Figure 9 This is a front view of the support frame in an embodiment of the present utility model;

[0045] Figure 10 It is a side view of the support frame in an embodiment of the present utility model;

[0046] Figure 11 This is a front view of the locking rod of an embodiment of the utility model;

[0047] Figure 12 This is a side view of the locking rod according to an embodiment of the present utility model;

[0048] Among them, 1-trolley shelf, 11-first upper articulated seat, 12-second upper articulated seat, 13-third upper articulated seat, 2-trolley chassis, 21-first lower articulated seat, 22-second lower articulated seat, 23-third lower articulated seat, 3-gas spring, 31-pressure cylinder, 32-telescopic rod;

[0049] 4-outer support frame, 41-upper hinge plate, 42-protective cover, 431-first guide plate, 432-second guide plate, 44-first hinged leg, 45-limiting sleeve, 5-inner support frame, 51-baffle, 52-locking hole, 53-second hinged leg, 6-handle, 7-locking rod, 71-lower hinge plate, 72-locking pin, 73-spring, 741-first retaining ring, 742-second retaining ring. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0051] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0052] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0053] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0054] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0055] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0056] Example 1

[0057] like Figures 1 to 12 As shown, the trolley shelf locking device in this embodiment includes a trolley shelf 1, a trolley chassis 2, a gas spring 3, an outer support frame 4, an inner support frame 5, a handle 6 and a locking rod 7.

[0058] like Figure 1As shown, the trolley shelf 1 is hinged to the trolley chassis 2. Specifically, in this embodiment, a first upper hinge seat 11 is provided at the front end of the lower portion of the trolley shelf 1, and a first lower hinge seat 21 is provided at the front end of the upper portion of the trolley chassis 2. The first upper hinge seat 11 is hinged to the first lower hinge seat 21.

[0059] The upper end of the outer support frame 4 is hingedly connected to the trolley shelf 1, and the lower end of the inner support frame 5 is hingedly connected to the trolley chassis 2. In this embodiment, the rear end of the lower portion of the trolley shelf 1 is provided with a second upper hinge seat 12, the rear end of the upper portion of the trolley chassis 2 is provided with a second lower hinge seat 22, the upper end of the outer support frame 4 is provided with a first hinge leg 44, and the lower end of the inner support frame 5 is provided with a second hinge leg 53. The first hinge leg 44 is hingedly connected to the second upper hinge seat 12, and the second hinge leg 53 is hingedly connected to the second lower hinge seat 22.

[0060] The inner support frame 5 is slidably connected to the outer support frame 4. The inner support frame 5 can extend or retract relative to the outer support frame 4 to change the angle between the trolley shelf 1 and the trolley chassis 2. In this embodiment, a baffle 51 is also provided at the lower end of the inner support frame 5. The baffle 51 is used to limit the falling of the outer support frame 4 to prevent the outer support frame 1 from falling too much and colliding with other components when adjusting the position of the trolley shelf 1.

[0061] One end of the gas spring 3 is hinged to the trolley shelf 1, and the other end of the gas spring 3 is hinged to the trolley chassis 2. In this embodiment, a third upper hinge seat 13 is specifically provided at the middle rear position of the lower part of the trolley shelf 1, and a third lower hinge seat 23 is provided at the middle position of the upper part of the trolley chassis 2. The upper end of the gas spring 3 is hinged to the third upper hinge seat 13, and the lower end of the gas spring 3 is hinged to the third lower hinge seat 23. The gas spring 3 provides an upward support force to overcome the gravity of the trolley shelf 1 itself when it is partially unloaded, so that it can be easily lifted or lowered to ensure that the posture of the trolley shelf 7 can be manually adjusted. In addition, considering the safety of use, the maximum length of the extension of the gas spring 3 is also used to limit the length of the inner support frame 5 relative to the outer support frame 4 to prevent the outer support frame 4 and the inner support frame 5 from falling off due to the lifting transition.

[0062] In addition, in this embodiment, the gas spring 3 is preferably provided in multiple pieces, and includes a pressure cylinder 31 and a telescopic rod 32 slidably connected to the pressure cylinder 31. The telescopic rod 32 is provided with a first hinge joint, which is hinged to the third upper hinge seat 13. The pressure cylinder 31 is provided with a second hinge joint, which is hinged to the third lower hinge seat 23. The gas spring 3 also provides a buffering and vibration reduction effect on the trolley shelf 1 and the trolley underframe 2. This significantly reduces vibration of the trolley shelf 1 during use of the trolley shelf locking device of this embodiment, and minimizes noise.

[0063] The trolley rack 1, trolley chassis 2, and gas spring 3 form a triangular structure. When the inner support frame 5 extends or retracts relative to the outer support frame 4, the triangular structure can stably support the trolley rack 1. The trolley rack 1, trolley chassis 2, gas spring 3, and the sliding connection between the outer support frame 4 and the inner support frame 5 form a quadrilateral structure. The quadrilateral structure is easily deformable and adjustable, making it easy to adjust the distance between the trolley rack 1 and the trolley chassis 2, so that the trolley rack 1 is close to the trolley chassis 2, or the trolley rack 1 is moved away from the trolley chassis 2 to a horizontal position.

[0064] like Figures 2 to 6 As shown, the middle portion of the handle 6 is hinged to the outer support frame 4, and the lower end of the handle 6 is hinged to the locking rod 7. The locking rod 7 is mounted on the outer support frame 4, with a spring 73 interposed between the locking rod 7 and the outer support frame 4. The remaining components of the locking rod 7 require welding. In this embodiment, an upper hinge plate 41 is mounted in the middle portion of the outer support frame 1, through which the handle 6 is hingedly connected to the outer support frame 1. A lower hinge plate 71 is mounted on the locking rod 7, and the lower end of the handle 6 is hingedly connected to the locking rod 7 via the first hinge plate 71.

[0065] The inner support frame 5 is provided with a plurality of locking holes 52 along the length direction, and the surface with the locking holes 52 on the inner support frame 5 faces both sides, and the end of the locking rod 7 is provided with a locking pin 72. Figure 3 The inner support frame 5 is moved laterally in the direction shown, so that the locking pin 72 is inserted into or disengaged from the locking hole 52. Specifically, when the locking pin 72 is inserted into the locking hole 52, the inner support frame 5 is stationary relative to the outer support frame 4. At this time, the angle between the trolley shelf 1 and the trolley chassis 2 is in a locked state and remains fixed; when the locking pin 72 is disengaged from the locking hole 52, the locked state is released. At this time, the inner support frame 5 can be extended or retracted relative to the outer support frame 4, thereby changing the angle between the trolley shelf 1 and the trolley chassis 2.

[0066] The trolley rack locking device maintains its locked state through the elastic force of spring 4. Spring 4 provides a rebound force that drives locking pin 72 into locking hole 52, ensuring that locking rod 7 remains locked in the absence of external force. Handle 6 utilizes the principle of leverage, with the hinged joint between handle 6 and upper hinge plate 41 serving as a fulcrum. Under external force, handle 6 drives locking rod 7 to move.

[0067] Specific as Figure 3 As shown, the handle 6 moves relative to the outer support frame 4 along a first positive direction ( Figure 3 The handle 6 drives the lock rod 7 to overcome the elastic force of the spring 73 and move in the second positive direction ( Figure 3The locking pin 72 moves in the second positive direction, and the locking pin 72 disengages from the locking hole 52 on the inner support frame 5. The locked state is released, and the inner support frame 5 can be extended or retracted relative to the outer support frame 4. When the external force is removed, the locking rod 7 moves in the second reverse direction ( Figure 3 The lock rod 7 drives the handle 6 relative to the outer support frame 4 along the first reverse direction ( Figure 1 The locking pin 72 moves in the second reverse direction, and the locking pin 72 is inserted into the locking hole 52 on the inner support frame 5 to maintain the locked state and maintain the telescopic length of the inner support frame 5 relative to the outer support frame 4 unchanged.

[0068] like Figure 11 and Figure 12 As shown, in this embodiment, the locking pin 72 includes a first locking pin and a second locking pin arranged in parallel. The first locking pin is arranged at one end of the locking rod 7, and the first locking pin cooperates with the locking hole 52 on the left side of the inner support frame. The second locking pin is arranged at the other end of the locking rod 7, and the second locking pin cooperates with the locking hole 52 on the right side of the inner support frame.

[0069] In this embodiment, the outer and inner support frames 4 are also provided with a protective cover 42, and the locking rod 7 is mounted inside the protective cover 42, which protects the locking rod 7. The locking rod 7 extends through the guide plate inside the protective cover 42, and the locking pin 72 extends outside the protective cover 42. The guide plate includes a first guide plate 431 and a second guide plate 432. The locking rod 7 is provided with a first retaining ring 741 and a second retaining ring 742. The first retaining ring 741 is located between the first guide plate 431 and the second guide plate 432, and the second retaining ring 472 is located on the side of the second guide plate 432 away from the first guide plate 431.

[0070] One end of the spring 73 is connected to the first guide plate 431, and the other end of the spring 73 is connected to the first retaining ring 741. The first retaining ring 741 and the first guide plate 431 limit the movement of the compression spring 73. When an external force is applied to rotate the handle 6 in the first positive direction, causing the locking pin 72 to disengage from the locking hole 52, the spring 73 is extended and a mutual rebound force is generated between the first retaining ring 741 and the first guide plate 431. When the external force is removed, the locking pin 72 is inserted into the locking hole 52 under the elastic force of the spring 73. The second guide plate 432 and the second retaining ring 742 are used to limit the distance the locking pin 72 can be pulled out. The second guide plate 432 limits the second retaining ring 742, preventing the locking rod 7 from being completely pulled out.

[0071] In addition, in this embodiment, a limit sleeve 45 is preferably provided on the outer support frame 4, one end of the locking pin 72 is connected to the locking rod 7, and the other end of the locking pin 72 is inserted into the limit sleeve 45. The limit sleeve 45 is used to extend the distance that the locking pin 72 can be pulled out to avoid machining errors that make it impossible to adjust.

[0072] The use process of the trolley shelf locking device in this embodiment is as follows:

[0073] When the trolley shelf 1 needs to be brought close to the trolley chassis 2, first manually rotate the handle 6 in the first positive direction to disengage the locking pin 72 from the locking hole 52. After the trolley shelf locking device is unlocked, manually apply a slight force to press the trolley shelf 1 to overcome the damping of the gas spring 3, and the inner support frame 5 retracts relative to the outer support frame 4, so that the trolley shelf 1 is close to the trolley chassis 2. Then, pull the handle 6 in the first reverse direction to insert the locking pin 72 into the locking hole 52, and the inner support frame 5 is locked relative to the outer support frame 4.

[0074] When the trolley shelf 1 needs to be adjusted to a horizontal position, first manually rotate the handle 6 in the first positive direction to disengage the locking pin 72 from the locking hole 52. The trolley shelf locking device is unlocked. Then, apply a little force to lift the trolley shelf 1. Under the joint action of the extension of the gas spring 3, the inner support frame 5 extends relative to the outer support frame 4. After the trolley shelf 1 is adjusted to a horizontal position relative to the ground, pull the handle 6 in the first reverse direction to insert the locking pin 72 into the locking hole 52. This allows the trolley shelf 1 to always maintain its current horizontal angle with the ground.

[0075] The trolley shelf locking device of the utility model eliminates the hydraulic control system and adopts a manual mechanical connection, which reduces the overall processing and manufacturing cost. At the same time, it is strong and durable, and has a long service life as shown by fatigue testing. It is also lighter in overall weight and more convenient to operate.

[0076] Example 2

[0077] A vehicle-mounted aerial ladder is provided with the trolley-shelf locking device as described in Example 1.

[0078] The utility model relates to a trolley rack locking device, which is assembled on a vehicle-mounted ladder. The position of the trolley rack can be manually adjusted by applying only a slight external force, which reduces labor intensity. During the use of the vehicle-mounted ladder, the gas spring acts as a buffer, significantly reducing the vibration of the trolley rack and making it extremely quiet.

[0079] Example 3

[0080] A ladder truck is provided with the vehicle-mounted ladder as described in Example 2.

[0081] The trolley rack locking device of the present invention abandons the combination of hydraulic control and electrical control, and adopts a simpler and more convenient manual mechanical connection. The gas spring overcomes the gravity of the trolley rack itself, ensuring that the position adjustment of the trolley rack can be completed manually. The handle uses the lever principle to drive the locking rod and the locking pin to move with the hinge of the outer support frame as the fulcrum. The spring provides a rebound force to facilitate locking. It is not only easy to operate but also has low manufacturing costs. In addition, the trolley rack locking device of the present invention also has good reliability and durability. The limit sleeve is used to extend the distance the locking pin is allowed to be pulled out to avoid machining errors that make the locking pin unable to be adjusted. The second guide plate in the protective cover cooperates with the second retaining ring on the lock rod to limit the distance the locking pin is pulled out, and relies on the maximum installation distance of the gas spring to ensure that the outer support frame and the inner support frame will not fall off due to lifting transition, making the device more secure.

[0082] Thus far, this embodiment has been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the trolley rack locking device, vehicle-mounted aerial ladder, and aerial ladder truck of the present invention. Of course, the above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made within the scope of the present invention's design and the contents of the present invention's specification and drawings, or direct / indirect application in other related technical fields, are included within the patent protection scope of the present invention and should be protected by the present invention.

Claims

1. A trolley shelf locking device, characterized in that: It includes a trolley rack, a trolley chassis, a gas spring, an outer support frame, an inner support frame, a handle and a locking rod; The trolley rack is hinged to the trolley chassis; One end of the gas spring is hinged to the trolley shelf, and the other end of the gas spring is hinged to the trolley chassis; The upper end of the outer support frame is hinged to the trolley shelf, and the lower end of the inner support frame is hinged to the trolley chassis. The inner support frame is slidably connected to the outer support frame. The inner support frame can be extended or retracted relative to the outer support frame. A plurality of locking holes are provided on the inner support frame along the length direction. The middle part of the handle is hinged to the outer support frame, the lower end of the handle is hinged to the lock rod, the lock rod is set on the outer support frame, a spring is set between the lock rod and the outer support frame, and a locking pin is set at the end of the lock rod; The handle overcomes the elastic force of the spring under the action of external force, so that the locking pin is separated from the locking hole; when the external force is removed, the locking rod is inserted into the locking hole under the action of the elastic force of the spring.

2. The trolley shelf locking device according to claim 1, characterized in that: The locking pin includes a first locking pin and a second locking pin arranged in parallel; A first locking pin is provided at one end of the locking rod, and the first locking pin is engaged with a locking hole on the left side of the inner support frame; The second locking pin is arranged at the other end of the locking rod, and the second locking pin cooperates with the locking hole on the right side of the inner support frame.

3. The trolley shelf locking device according to claim 1, characterized in that: A protective cover is provided on the outer support frame; The locking rod is installed inside the protective cover, the locking rod passes through the guide plate inside the protective cover, and the locking pin extends to the outside of the protective cover.

4. The trolley shelf locking device according to claim 3, characterized in that: The guide plate includes a first guide plate and a second guide plate; The locking rod is provided with a first retaining ring and a second retaining ring, the first retaining ring is located between the first guide plate and the second guide plate, and the second retaining ring is located on a side of the second guide plate away from the first guide plate; One end of the spring is connected to the first guide plate, and the other end of the spring is connected to the first retaining ring.

5. The trolley shelf locking device according to claim 1, characterized in that: A limiting sleeve is provided on the outer support frame, and the locking pin passes through the limiting sleeve.

6. The trolley shelf locking device according to claim 1, characterized in that: A first upper hinge seat is provided at the front end of the lower portion of the trolley rack, a second upper hinge seat is provided at the rear end of the lower portion of the trolley rack, and a third upper hinge seat is provided at the middle rear position of the lower portion of the trolley rack; A first lower hinge seat is provided at the front end of the upper part of the trolley chassis, a second lower hinge seat is provided at the rear end of the upper part of the trolley chassis, and a third lower hinge seat is provided at the middle position of the upper part of the trolley chassis; The first upper hinge seat is hinged to the first lower hinge seat; The upper end of the outer support frame is hinged to the second upper hinge seat, and the lower end of the inner support frame is hinged to the second lower hinge seat; The upper end of the gas spring is hinged to the third upper hinge seat, and the lower end of the gas spring is hinged to the third lower hinge seat.

7. The trolley shelf locking device according to claim 6, characterized in that: The gas spring comprises a pressure cylinder and a telescopic rod slidably connected to the pressure cylinder; The telescopic rod is provided with a first hinge joint, which is hinged to the third upper hinge seat; The pressure cylinder is provided with a second hinged joint, which is hinged to the third lower hinged seat.

8. The trolley shelf locking device according to claim 1, characterized in that: The gas springs are provided in plurality.

9. A vehicle-mounted aerial ladder, characterized in that: The vehicle-mounted aerial ladder is provided with a trolley shelf locking device as described in any one of claims 1 to 8.

10. A ladder truck, characterized in that: The aerial ladder truck is provided with the vehicle-mounted aerial ladder according to claim 9.

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