Guardrail adjustable lifting device

Abstract

The application belongs to the field of lifting devices, and relates to a guardrail-adjustable lifting device, which comprises a supporting table, a guardrail assembly and a locking mechanism. The supporting table comprises a bottom plate and a cover plate. The bottom plate is provided with a plurality of insertion slots. The guardrail assembly comprises two side blocks, two end blocks and two bottom supporting plates matched with the side blocks respectively. The bottom supporting plates are provided with insertion arms matched with the insertion slots and vertical supporting arms. The end blocks comprise first parts and second parts fixed on different supporting arms, and each of the two parts comprises a plurality of horizontal rod parts arranged alternately in an up-down direction, and the horizontal rod parts at the ends of the two parts are connected in a detachable manner. The locking mechanism is fixed on the bottom plate and close to the port of the insertion slot. After the insertion arms are matched with the insertion slots in a plug-in manner, the locking mechanism can selectively switch the guardrail assembly and the supporting table between a fixed connection state and a movable connection state. The application overcomes the problem that the existing container loading and unloading lift cannot simultaneously achieve protection and operation efficiency.

Description

Technical Field

[0001] This invention belongs to the field of elevators, and specifically relates to an adjustable lifting device for guardrails. Background Technology

[0002] To meet the dual needs of rapid loading and unloading of heavy containers, adaptability to various cargo sizes, and personnel access for maintenance / emergency response, container loading and unloading elevators have become core vertical transfer equipment in ports, logistics parks, container yards, and other scenarios. They primarily enable the vertical transfer of containers and cargo between different work surfaces, transport vehicles, and storage areas. The operation process is characterized by heavy load transfer, high-frequency operation, multi-equipment coordination, and occasional personnel access for work. Existing container loading and unloading elevators (hereinafter referred to as elevators) mostly have fixed guardrails (i.e., the guardrail and the support platform are an integral structure, not easily disassembled / adjustable). While this ensures personnel safety, it can cause physical interference with containers and loading / unloading equipment, hindering precise container docking and cargo transfer, and reducing operational efficiency. Some elevators also lack guardrails or have simple protective structures, failing to meet high-altitude operation safety regulations and increasing the risk of falls, thus limiting their use. Therefore, there is an urgent need to design a lift with adjustable guardrails (such as those that can be quickly installed and removed, or those that can adjust the position and height), so that it can be quickly installed to form a safety barrier when personnel are working on the platform, avoiding the risk of falling from heights, and can be quickly disassembled to eliminate structural interference when loading and unloading goods, ensuring smooth operation. It should also take into account the adaptability of the equipment to multiple scenarios and compliance, and solve the technical pain point of the existing lift guardrail structure that "protection and operation efficiency cannot be balanced". Summary of the Invention

[0003] To address the problem of existing container loading and unloading elevators failing to balance safety and operational efficiency, this invention provides a lifting device with adjustable guardrails. This device ensures the safety of personnel working on the platform while also facilitating smooth loading and unloading of goods, thereby improving operational efficiency.

[0004] The technical solution adopted by the present invention to solve its technical problem is: an adjustable lifting device for guardrails, including a support platform, a lifting drive assembly matched with the support platform, a guardrail assembly provided on the support platform, and multiple locking mechanisms.

[0005] The support platform includes a base plate and a cover plate fixed to the upper part of the base plate. On the base plate, slots extending in the front-to-back direction are provided near the left and right ends of its front and rear side walls, respectively. The slots can be formed on the upper surface of the base plate, and the upper ends of the slots are open. The two slots near the left end can be a continuous, integrated structure or a separate, non-continuous structure; similarly, the two slots near the right end can also be a continuous, integrated structure or a separate, non-continuous structure.

[0006] The guardrail assembly includes two side rails arranged opposite each other at the front and rear, two end rails arranged opposite each other at the left and right, and two base plates. The side rails and base plates are matched one-to-one and fixedly mounted on the upper part of the base plates, with their lengths extending in the same direction. On the base plate, on the side facing the base plate, there are insert arms that match slots one-to-one, and at the ends, there are vertically extending support arms; the correspondence between the side rails and the two support arms on the same base plate is such that the side rails are located between the two support arms. The end rails include a first part and a second part, respectively fixedly mounted on the two opposite support arms. Both the first and second parts include multiple horizontal bars arranged alternately at the top and bottom, and multiple vertical bars arranged alternately at the front and rear between the two opposite horizontal bars. The ends of the horizontal bars of the first part can be detachably fixedly connected to the ends of the horizontal bars of the second part, thus allowing for a detachable connection between the ends of the horizontal bars of the two parts.

[0007] The locking mechanism is fixedly mounted on the base plate and corresponds to the port of each slot. After the insert arm and slot are inserted and matched one by one, the locking mechanism can match the insert arm and selectively switch the guardrail assembly and the support platform between a fixed connection state and a movable connection state.

[0008] Optionally, a plurality of toothed grooves are provided on the side of the insert arm, which are distributed alternately in the direction of its length extension.

[0009] The locking mechanism includes a drive unit and a slider, enabling the drive unit to reciprocate the slider relative to the base plate in a left-right direction. Multiple teeth are alternately distributed on the slider's side facing the slot. When the drive unit drives the slider to reciprocate relative to the base plate, the multiple teeth can simultaneously insert into and remove from multiple slots, selectively switching the guardrail assembly and the support platform between a fixed connection and a movable connection.

[0010] Optionally, the base plate is provided with a groove for accommodating the drive unit and the slider, and an opening is formed on the side of the groove near the slot.

[0011] The drive unit is fixed inside the slot and located at the end furthest from the slot. The teeth on the slider can extend into the slot through the opening and retract back into the slot.

[0012] Optionally, the drive unit includes an electromagnet fixedly mounted on a U-shaped frame and a matching arm plate and flat spring. The U-shaped frame is fixedly connected to the base plate, and the arm plate extends in the left-right direction toward the slot.

[0013] The slider has a grooved rail that can be inserted into the arm plate, and the two ends of the flat spring are in contact with the opposite end faces of the U-shaped frame and the slider, respectively. On the slider, an armature part is fixed on its end face facing the U-shaped frame, which is arranged alternately and opposite to the magnetic force surface of the electromagnet.

[0014] By switching the electromagnet between on and off states, the operator can move the slider towards the U-shaped frame under the magnetic attraction and away from the U-shaped frame under the stretching force of the flat spring.

[0015] Optionally, the number of teeth on one side of the arm is greater than the number of teeth on the corresponding slider. This allows for adjustment of the front-to-back width of the guardrail assembly within a certain range, better accommodating different cargo shapes, such as containers, increasing versatility, and appropriately expanding the working space for personnel on the platform.

[0016] Optionally, a pull rod structure is provided at the end of the crossbar in the first part and at the end of the crossbar in the second part, and the pull rod structure can increase the length of the crossbar, that is, the pull rod structure can extend the length of the crossbar.

[0017] Sleeve 1 and sleeve 2 are respectively provided at the opposite ends of the first part of the pull rod structure and the second part of the pull rod structure, and the opposite ends of sleeve 1 and sleeve 2 can be connected together by a threaded structure.

[0018] Optionally, a countersunk hole is formed at the end of the crossbar portion along its axial direction. The pull rod structure includes a cylindrical section threadedly fixed to the end of the crossbar portion, and associatedly configured rod one, spring member, and rod two.

[0019] An inner radial flange, preferably an annular one, is formed on the inner wall of the column tube, near the inner side of the end closest to the crossbar. An outer radial flange is formed at one end of rod one, extending into the countersunk hole. The outer radial flange is also preferably an annular one. A spring is fitted onto the section of rod one within the countersunk hole. The other end of rod one passes through the inner radial flange on the column tube and extends into the cylinder cavity, where it is fixedly connected to the end of rod two that extends into the column tube.

[0020] The two ends of the spring are respectively in contact with the end face of the outer radial flange and the end face of the inner radial flange, so that the spring can be compressed or released when the rod moves relative to the crossbar and thus undergo expansion and contraction deformation.

[0021] The outer diameter of the outer radial flange is the same as the inner diameter of the countersunk hole. Alternatively, the outer diameter of rod one can be the same as the inner diameter of the inner radial flange. The outer diameter of rod two is the same as the inner diameter of the cylinder cavity.

[0022] After the other end of rod two extends outside the column, it is either fitted with sleeve one or fitted with sleeve two, and a fixed connection is established by bolts, so that sleeve one can rotate relative to rod two around the axis and maintain an axial fixed connection, and sleeve two can rotate relative to rod two around the axis and maintain an axial fixed connection.

[0023] Optionally, the guardrail assembly also includes multiple telescopic rods mounted on the base plate, arranged alternately along the length of the base plate. Multiple connecting rods are provided between adjacent telescopic rods, arranged alternately along the axial direction of the telescopic rods. A mesh is provided between the connecting rods, and end blocks are provided at the ends of the connecting rods. The lower end face of the base plate has protrusions that correspond one-to-one with the telescopic rods, and the protrusions have shaped holes that can be inserted into and matched with the end blocks.

[0024] Optionally, a permanent magnet is fixedly provided at the inner end of the shaped hole. An iron block portion is fixedly provided on the end face of the end block facing the protrusion.

[0025] The beneficial effects of this invention are as follows: This application solves the problem of the inability to balance protection and operational efficiency in existing container loading and unloading elevators. Its design and use can ensure the safety of personnel when working on the platform, while also ensuring the smoothness and efficiency of cargo loading and unloading. The adjustable guardrail lifting device involved in this application, with its detachable guardrail structure, can not only be used for loading and unloading standardized containers, but also accommodate various scenarios such as non-standard cargo transfer, temporary equipment relocation, and temporary site use in actual operations. It has the advantages of breaking through the limitations of single operations and improving the comprehensive utilization rate. While providing safety protection, it can also balance operational safety, operational efficiency, equipment adaptability, and scenario compatibility, enabling it to be developed from multiple dimensions such as safety assurance, practical needs, and compliance requirements throughout the entire operation process. Attached Figure Description

[0026] Figure 1 This is a top view of the structure of this application (without a cover plate and the insert arm inserted into the slot).

[0027] Figure 2 This is a side view structural diagram of the bottom support plate when it is matched with the side guards and end guards.

[0028] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point I in the middle.

[0029] Figure 4 This is a top view of the structure of this application (without cover plate or side guard and with the insert arm fully inserted into the slot).

[0030] Figure 5 for Figure 4A magnified schematic diagram of the structure at point II.

[0031] Figure 6 This is a top-view structural diagram of the insert arm not being inserted into the slot.

[0032] Figure 7 for Figure 6 A magnified schematic diagram of the structure at point III.

[0033] Figure 8 This is a top-view structural diagram of this application.

[0034] In the diagram: 10 Support platform, 11 Base plate, 111 Slot, 112 Type groove, 1121 Opening, 113 Protrusion, 114 Protrusion, 1141 Permanent magnet, 12 Cover plate; 20 Guardrail assembly, 21 Side rail, 22 End rail, 221 First part, 222 Second part, 223 Crossbar, 2231 Countersunk hole, 2232 Column, 2233 Rod one, 2234 Spring component, 2235 Rod two, 2236 Sleeve one, 2237 Sleeve Cylinder 2, 2238 Bolt, 224 Upright, 23 Base plate, 231 Insert arm, 2311 Tooth groove, 232 Support arm, 24 Telescopic rod, 241 Connecting rod, 242 Mesh, 243 End block; 30 Locking mechanism, 31 U-shaped frame, 311 Arm plate, 3111 Support rod, 312 Flat spring, 313 Strip hole, 32 Electromagnet, 33 Slider, 331 Tooth, 332 Armature, 333 Protruding arm, 3331 Groove rail, 334 Edge plate. Detailed Implementation

[0035] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "front," "rear," and "middle" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0036] like Figures 1 to 8 The adjustable lifting device for a guardrail shown includes a support platform 10, a lifting drive assembly matched with the support platform 10, a guardrail assembly 20 disposed on the support platform 10, and a plurality of locking mechanisms 30.

[0037] The support platform 10 includes a base plate 11 and a cover plate 12 fixedly disposed on the upper part of the base plate 11 (covering the upper end surface of the base plate 11). The base plate 11 and the cover plate 12 are fixedly connected as a whole by a plurality of distributed bolts. An anti-slip layer may be provided on the upper end surface of the cover plate 12. On the base plate 11, slots 111 extending in the front-rear direction are respectively provided near the left and right ends of its front and rear side walls. The slots 111 can be formed on the upper end surface of the base plate 11, and the upper end of the slots 111 is an open structure, as shown in the figure. Figure 1 , Figure 4 , Figure 6 As shown.

[0038] The two slots 111 near the left end can be a single, continuous structure or a separate structure that is not continuous from front to back; similarly, the two slots 111 near the right end can also be a single, continuous structure or a separate structure that is not continuous from front to back. In other words, the two slots 111 on the left or right end can be as follows: Figure 1 , Figure 4 The structure shown can be either a through-type structure or a non-through-type structure (i.e., the inner ends of the two slots 111 on the left side and opposite to each other are not connected, and the inner ends of the two slots 111 on the right side and opposite to each other are also not connected). After the cover plate 12 is fixed on the base plate 11, it can cover the upper opening of the slot 111 (and the upper opening of the groove 112).

[0039] The lifting drive assembly, referencing existing technology, functions to drive the support platform 10 and the guardrail assembly 20 to move vertically, thereby transporting workers, containers, or goods to different heights. The lower part of the lifting drive assembly can be fixed to a power vehicle or a manual vehicle, while the upper part matches the lower end face of the base plate 11 (a mating structure connecting the lower part of the lifting drive assembly needs to be provided on the lower end face of the base plate 11, but since this is existing technology, it will not be elaborated upon or shown in the illustrations). The driving power of the lifting drive assembly can be hydraulic or electric. In summary, the lifting drive assembly can be adapted to any form of existing technology design based on actual conditions (including power requirements, operational requirements, etc.), and therefore will not be elaborated upon further in the following description.

[0040] Referring to the prior art, the guardrail assembly 20 includes two side rails 21 arranged opposite each other at the front and rear, and two end rails 22 arranged opposite each other on the left and right. The two side rails 21 and the two end rails 22 can enclose a rectangular space. Moreover, as with the prior art, the side rails 21 and the end rails 22 can both be truss structures formed by the intersection of multiple horizontal beams (which may be referred to as horizontal bar portions 223 as mentioned below) and multiple vertical beams (which may be referred to as vertical pole portions 224 as mentioned below).

[0041] In the technical solution of this application, the guardrail assembly 20 further includes two base plates 23, which are arranged opposite each other and respectively match two side rails 21. The side rails 21 are fixedly mounted on the upper part of the base plates 23, and their length extension directions are the same, both extending in the left-right direction in the figure. On the base plate 23, on its side facing the base plate 11 (front or rear), there is a plug arm 231 that can match the slot 111 one by one, and on the (left and right) ends, there is a vertically upward extending support arm 232. The side rails 21 provided on the same base plate 23 can be positioned opposite each other between the two support arms 232, as shown in the figure. Figure 8 As shown.

[0042] It needs to be emphasized that: in Figures 1 to 8 In the illustrated scheme, the insert arm 231 has a relatively large (front-to-back) extension length, mainly to clearly express the need for the side stop 21 to adjust its front-to-back fixed position relative to the support platform 10 (or the base plate 11). This is achieved by increasing the length of the insert arm 231 to enlarge the toothed groove 2311 structure on it, thus clearly illustrating the structural features without making the drawing too large. In actual manufacturing, the length of the insert arm 231 should be significantly less than half the width (front-to-back dimension, the same below) of the support platform 10, and may even be significantly less than one-third of the width of the support platform 10. Correspondingly, the depth (front-to-back dimension) of the slot 111 also needs to be reduced, and preferably, the two slots 111 on the front and rear sides of the base plate 11 are non-through structures in the front-to-back direction.

[0043] In this application, the end stop 22 includes a first part 221 and a second part 222, which are respectively fixedly mounted on two opposing support arms 232. That is, the two support arms 232 are located on two base plates 23 and are positioned opposite each other. The first part 221 includes multiple horizontal bar sections 223 arranged alternately vertically, and multiple vertical pole sections 224 arranged alternately between two opposing horizontal bar sections 223. The second part 222 also includes multiple horizontal bar sections 223 arranged alternately vertically, and also multiple vertical pole sections 224 arranged alternately between two opposing horizontal bar sections 223. The ends of the horizontal bar sections 223 of the first part 221 can be detachably connected to the ends of the horizontal bar sections 223 of the second part 222 to form a whole, thereby assembling the end stop 22.

[0044] The locking mechanism 30 is fixedly mounted on the base plate 11 and is located near the (external) ports of each slot 111. The insert arm 231 can be inserted into the slot 111 in a one-to-one correspondence. When the insert arm 231 is inserted into the slot 111, the locking mechanism 30 can be matched with the insert arm 231, thus establishing a mechanical connection. This allows the guardrail assembly 20 and the support platform 10 to be selectively switched between a fixed connection and a movable connection. When in an active connection state (while the first part 221 and the second part 222 are not fixedly connected), the insert arm 231 can move freely relative to the slot 111; conversely, when in a fixed connection state, the insert arm 231 can no longer move relative to the slot 111, but is mechanically fixedly connected to the base plate 11 by the locking mechanism 30, so as to achieve the purpose of fixing the guardrail assembly 20 and the support platform 10 into a whole. At that time, the first part 221 and the second part 222 also need to be fixedly connected together so that the two end stops 22 of the guardrail assembly 20 are connected into a whole.

[0045] The locking mechanism 30 includes a drive unit and a slider 33, enabling the drive unit to drive the slider 33 to reciprocate relative to the base plate 11 in a left-right direction, allowing the slider 33 to move closer to and further away from the (left and right) edges of the slot 111. On the slider 33, a plurality of alternately distributed teeth 331 (i.e., protruding teeth) are formed on its (left and / or right) sides facing the slot 111. When the drive unit drives the slider 33 to reciprocate relative to the base plate 11, the plurality of teeth 331 can simultaneously insert into and simultaneously exit from the plurality of toothed grooves 2311, thereby selectively switching the guardrail assembly 20 and the support platform 10 between a fixed connection state and a movable connection state. To ensure that the teeth 331 can smoothly insert into the toothed grooves 2311, such as... Figure 5 , Figure 7 The outer port of the tooth groove 2311 is formed as a flared structure, the free end of the tooth 331 is formed as a narrowed end, and the width (front-to-back dimension) of the tooth groove 2311 is slightly larger than the thickness (front-to-back dimension) of the tooth 331, with the difference controlled within 3 mm, preferably within 1.5 mm. Furthermore, it is preferable that the number of tooth grooves 2311 on one side of the insert arm 231 is greater than the number of teeth 331 on the corresponding slider 33, such as... Figure 1 , Figures 4 to 5 As shown.

[0046] The base plate 11 has a groove 112 for accommodating the drive unit and the slider 33, and an opening 1121 is formed on the side of the groove 112 near the slot 111. The drive unit is fixedly disposed in the groove 112 and located at the end opposite to the slot 111. The teeth 331 on the slider 33 can extend into the slot 111 through the opening 1121, and when the insert arm 231 is inserted into the slot 111, the teeth 331 on the slider 33 can engage with the toothed grooves 2311 on the insert arm 231. The teeth 331 on the slider 33 can also retract into the groove 112 through the opening 1121, thereby releasing the engagement between the teeth 331 and the toothed grooves 2311, allowing the insert arm 231 to be pulled out of the slot 111.

[0047] The slider 33 is provided with a pair of edge plates 334 that prevent the body of the slider 33 from sliding from the opening 1121 into the slot 111. The two edge plates 334 are positioned at the front and rear edges of the opening 1121.

[0048] The drive unit includes an electromagnet 32 ​​(or electromagnet unit / assembly, hereinafter the same) fixedly mounted on a U-shaped frame 31 and a matching arm plate 311 and a flat spring 312. The electromagnet 32 ​​can be fixedly connected to the U-shaped frame 31, and the arm plate 311 and the U-shaped frame 31 are integrally formed. The flat spring 312 is movably mounted / sleeved on the arm plate 311.

[0049] The U-shaped frame 31 is detachably fixed to the base plate 11, and the arm plate 311 extends in the left and right direction toward the slot 111, requiring that the free end of the arm plate 311 and the slot 111 maintain a left and right distance.

[0050] The slider 33 is provided with a groove section 3331 that can be inserted into the arm plate 311, and the two ends of the flat spring 312 are respectively in contact with the opposite end faces of the U-shaped frame 31 and the slider 33. Specifically, a left-right extending protruding arm 333 is formed on the end face of the slider 33 facing the U-shaped frame 31, and the groove section 3331 is formed on the protruding arm 333, extending from the free end face of the protruding arm 333 in the left-right direction. The (free end) end of the arm plate 311 can maintain an inserted-fit state with the groove section 3331. When the slider 33 reciprocates in the left-right direction, the length (left-right dimension) of the arm plate 311 extending into the groove section 3331 can change. The insertion and matching relationship established between the arm plate 331 and the protruding arm 333 through the groove rail portion 3331 guides the slider 33 to perform linear reciprocating movements relative to the base plate 11 and relative to the U-shaped frame 31 in the left-right direction. A support rod portion 3111 can be provided at the free end of the arm plate 311 to ensure that the arm plate 311 can extend stably and reliably in the left-right direction, reducing the adverse effects of the cantilever effect on the insertion and matching state of the arm plate 311 and the groove rail portion 3331.

[0051] On the slider 33, an armature portion 332 (or iron block) is fixedly provided on its end face facing the U-shaped frame 31, which is alternately and opposite to the magnetic surface of the electromagnet 32. By switching the energized and de-energized states of the electromagnet 32, the operator can move the slider 33 towards the U-shaped frame 31 under magnetic attraction and away from the U-shaped frame 31 under the stretching force of the flat spring 312. In other words, when the electromagnet 32 ​​is energized, it generates a sufficiently large magnetic attraction to interact with the armature portion 332, thus attracting the slider 33 towards the U-shaped frame 31. This causes the toothed portion 331 to completely disengage from the toothed groove 2311, during which the flat spring 312 is gradually compressed, accumulating a sufficiently large stretching force. When the electromagnet 32 ​​is de-energized, its magnetic attraction disappears. Under the extension force of the flat spring 312, the slider 33 can be driven to move away from the U-shaped frame 31, so that the tooth 331 can be fully inserted into the tooth groove 2311.

[0052] The U-shaped frame 31, the electromagnet 32, and the slider 33 can all be accommodated in the groove 112, and preferably, the upper end / top surface of all three is recessed downward relative to the upper port edge of the groove 112. This way, after the cover plate 11 is fixed to the base plate 11, the cover plate 11 can cover the upper port of the slot 111 and the groove 112, but will not obstruct the movement of the slider 33, nor will it apply excessive force to the U-shaped frame 31 and the electromagnet 32. A through hole is provided on the bottom surface of the groove 112 for introducing the wiring of the electromagnet 32 ​​to the lower part of the base plate 11, see... Figure 1 , Figures 4 to 7 As shown.

[0053] Furthermore, to facilitate the control and adjustment of the position of the U-shaped frame 31 or the position of the electromagnet 32, so that the magnetic attraction force of the electromagnet 32 ​​can fully act on the armature part 332, causing the slider 33 to move fully away from the slot 111, so that the tooth part 331 is completely retracted into the groove 112, strip holes 313 can be provided on the two arms of the U-shaped frame 31, and two rows of alternately distributed threaded countersunk holes can be provided on the bottom surface of the groove 112, with each row containing multiple threaded countersunk holes. The strip holes 313 on the two arms of the U-shaped frame 31 can correspond and match the two rows of threaded countersunk holes respectively, and then the U-shaped frame 31 can be fixed to the bottom surface of the groove 112 by bolts or screws. As shown in the illustrated scheme, Figure 5 Two opposing protrusions 113 are formed near the center of the bottom surface of the groove 112. The threaded countersunk holes are distributed on the protrusions 113, and the two arms of the U-shaped frame 31 are correspondingly distributed on the two protrusions 113.

[0054] Based on the technical solution of this application, when personnel are working on the platform, the guardrail assembly 20 can be fully connected, ensuring the safety and reliability of its protective function. Simultaneously, the guardrail assembly 20 and the support platform 10 can be fully connected, ensuring the firmness and reliability of their relative connection. This effectively protects the safety of personnel standing within the guardrail assembly 20. During cargo loading and unloading operations, the fixed connection between the first part 221 and the second part 222 is removed, and the locking mechanism 30 is released from the locking state of the insert arm 231. This allows the guardrail assembly 20 to be quickly removed from the support platform 10, eliminating structural interference caused by the guardrail assembly 20 during cargo loading and unloading operations, thus ensuring the efficiency and smoothness of container loading and unloading. Therefore, the technical solution of this application simultaneously achieves the goal of ensuring the safety of personnel working on the platform, as well as the efficiency and structural interference-free nature of cargo loading and unloading operations. In addition, it has the advantages of simple overall structure, safe and reliable fixed connection between accessories / components / structural units, and convenient and quick assembly and disassembly, which is conducive to its promotion and application in actual production operations.

[0055] Multiple grooves 2311 are provided on the side (one or both sides) of the insertion arm 231, arranged alternately along its length. If the grooves 2311 are provided only on one side of the insertion arm 231, then one locking mechanism 30 is provided near the outer port of the slot 111; conversely, if the grooves 2311 are provided on both sides of the insertion arm 231, then two locking mechanisms 30 are provided near the outer port of the slot 111, and the two locking mechanisms 30 are arranged opposite each other on the left and right edges of the slot 111, as shown in the figure. Figure 1 , Figures 4 to 7 As shown.

[0056] The number of grooves 2311 on one side of the insert arm 231 is greater than the number of teeth 331 on the corresponding matching slider 33, such that the former is more than 1.5 times the latter. This allows for adjustment of the front-to-back width of the guardrail assembly 20 within a certain range, better adapting to different cargo dimensions, such as containers, increasing versatility, and appropriately expanding the working space for personnel. Correspondingly, it is required that the two parts of the end guard 22 can selectively establish a fixed connection relationship even when the front-to-back width of the guardrail assembly 20 changes. Specifically, the design is as follows: Figures 2 to 3 , Figure 8As shown, a pull-out rod structure is provided at the end of the crossbar portion 223 on the first part 221 and at the end of the crossbar portion 223 on the second part 222, and the pull-out rod structure can increase the length of the crossbar portion 223. A sleeve 1 2236 and a sleeve 2237 are respectively provided at the opposite ends of the pull-out rod structure of the first part 221 and the pull-out rod structure of the second part 222, and the opposite ends of the sleeve 1 2236 and the sleeve 2237 can be connected together by a threaded structure.

[0057] A countersunk hole 2231 is formed at the end of the crossbar portion 223 along its axial direction. Correspondingly, the pull rod structure includes a cylindrical tube 2232 that is threadedly fixed to the end of the crossbar portion 223, as well as a first rod 2233, a spring member 2234, and a second rod 2235.

[0058] An inner radial flange is formed on the inner wall of the cylindrical tube 2232, and on the inner side of the end near the crossbar portion 223.

[0059] One end of the rod 2233 has an outer radial flange that extends into the countersunk hole 2231.

[0060] The spring element 2234 is sleeved on the section of the first rod 2233 that is located inside the countersunk hole 2231. The other end of the first rod 2233 passes through the inner radial flange provided on the column cylinder 2232 and extends into the cylinder cavity of the column cylinder 2232, and is fixedly connected to the end of the second rod 2235 that extends into the column cylinder 2232.

[0061] The two ends of the spring member 2234 are respectively in contact with the end faces of the outer radial flange (preferably an annular body) and the inner radial flange (preferably an annular body), allowing the spring member 2234 to undergo telescoping deformation when the first rod 2233 moves axially relative to the crossbar portion 223. The outer diameter of the outer radial flange is the same as the inner diameter of the countersunk hole 2231. Alternatively, the outer diameter of the first rod 2233 can be the same as the inner diameter of the inner radial flange. The outer diameter of the second rod 2235 is the same as the inner diameter of the cylinder cavity of the column 2232.

[0062] The other end of the second rod 2235 extends outside the column 2232 and is either fitted with the first sleeve 2236 or the second sleeve 2237, respectively, and is fixedly connected by bolts 2238. This allows the first sleeve 2236 to rotate relative to the second rod 2235 around its axis while maintaining an axially fixed connection, and also allows the second sleeve 2237 to rotate relative to the second rod 2235 around its axis while maintaining an axially fixed connection. In other words, as... Figure 3As shown, the other end of the second rod 2235 on the crossbar portion 223 of the first part 221 extends out of the column cylinder 2232 and is fitted with the first sleeve 2236. A fixed connection is established by bolts 2238, allowing the first sleeve 2236 to rotate relative to the second rod 2235 around its axis, while maintaining an axially fixed connection. Similarly, the other end of the second rod 2235 on the crossbar portion 223 of the second part 222 extends out of the column cylinder 2232 and is fitted with the second sleeve 2237. A fixed connection is established by bolts 2238, allowing the second sleeve 2237 to rotate relative to the second rod 2235 around its axis, while maintaining an axially fixed connection.

[0063] After applying an external force to pull the second rod 2235 outwards from the column cylinder 2232 by a certain length, the axial length of the crossbar portion 223 is increased. This ensures that the length of the crossbar portions 223 on both parts (i.e., the first part 221 and the second part 222) can be adaptively adjusted when the width of the guardrail assembly 20 changes, ensuring that the ends of the opposing crossbar portions 223 are always fixedly connected. Tightening the first sleeve 2236 and the second sleeve 2237 disengages the threaded connection between them. After removing the external force, under the elastic force of the spring member 2234, a section of the second rod 2235 that extends outwards from the column cylinder 2232 retracts back into the column cylinder 2232 and resets.

[0064] like Figure 1 , Figure 2 As shown, the guardrail assembly 20 also includes a plurality of telescopic rods 24 disposed on the base plate 23, and the plurality of telescopic rods 24 are distributed alternately along the length direction of the base plate 23 and are located opposite to each other below the insert arm 231.

[0065] Multiple connecting rods 241 are provided between adjacent telescopic rods 24, and the connecting rods 241 are arranged alternately along the axial direction of the telescopic rods 24. A mesh 242 is provided between the connecting rods 241, and an end block 243 is provided at the end of each connecting rod 241.

[0066] The lower end face of the base plate 11 is provided with protrusions 114 that correspond one-to-one with the telescopic rods 24, and the protrusions 114 are provided with shaped holes that can be inserted into the end blocks 243. In the illustration, the protrusions 114 are located on the side of the base plate 11 for ease of illustration. In actual installation, the protrusions 114 need to be fixed to the lower part of the base plate 11, recessed inwards from the front and rear edges of the base plate 11 by a certain distance. Thus, when the insert arm 231 is inserted into the slot 111, the free end of the telescopic rod 24 can extend below the surface of the base plate 11 and connect with the shaped holes on the protrusions 114. The telescopic rod 24 in the illustrated scheme is a three-stage telescopic structure (it can also be two-stage). The connecting rod 241 is located near the free end of each stage, as shown in the figure. Figure 1 In this way, the connecting rod 241 will not affect the extension and retraction of the telescopic rod 24. When the telescopic rod 24 extends, the mesh fabric 242 can gradually unfold; when the telescopic rod 24 shortens, the mesh fabric 242 can gradually droop and shrink its unfolded width.

[0067] After the telescopic rod 24 and other components are installed in this application, the mesh 242 can be used to provide secondary protection for the front and rear sides of the guardrail assembly 20. This helps to ensure the safety of the guardrail assembly 20 when its width (front and rear dimension) is significantly extended outward relative to the support platform 10. It can effectively protect the safety of people or objects on the support platform 10 and prevent falls.

[0068] To ensure a secure and reliable connection between the free end of the telescopic rod 24 and the protrusion 114, facilitating connection and preventing detachment after insertion, a permanent magnet 1141 (i.e., a magnet) can be fixedly installed inside the shaped hole. Correspondingly, an iron block portion is fixedly installed on the end face of the end block 243 facing the protrusion 114. After the end of the telescopic rod 24 is inserted into the shaped hole, the permanent magnet 1141 can attract and connect with the iron block portion, making it difficult for the end block 243 to detach from the shaped hole; a certain amount of pulling force is required.

[0069] The adjustable lifting device for guardrails involved in this application can prevent the risk of falls from height by quickly installing guardrails when personnel are working on the platform, which complies with industry safety standards and enterprise safety production requirements; during cargo loading and unloading operations, the guardrails can be quickly disassembled to eliminate structural interference, ensuring the efficiency and smoothness of container loading and unloading; therefore, it also takes into account the multi-scenario adaptability and maintenance convenience of the equipment, and has the advantages of improving the overall utilization rate of the equipment and reducing operating costs.

[0070] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Many aspects of the present invention can be improved without departing from the overall concept. Those skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An adjustable lifting device for a guardrail, comprising a support platform (10) and a guardrail assembly (20); the guardrail assembly (20) comprises two side rails (21) and two end rails (22); characterized in that: It also includes multiple locking mechanisms (30); The support platform (10) includes a base plate (11) and a cover plate (12) that can be fixedly connected together; on the base plate (11), there are slots (111) extending in the front and rear directions near the left and right ends of its front and rear side walls, respectively. The guardrail assembly (20) also includes two base plates (23); side rails (21) are respectively provided on the upper part of the two base plates (23); on the base plate (23), on its side facing the base plate (11), there is a plug arm (231) that can match the slot (111), and at the end there is a support arm (232) that extends vertically upward; the end rail (22) includes a first part (221) and a second part (222) respectively fixed on the front and rear opposite support arms (232), and both parts include multiple horizontal bar parts (223) arranged vertically and vertically, and multiple vertical bar parts (224) arranged between the horizontal bar parts (223) in a front and rear alternating manner, and the ends of the horizontal bar parts (223) of the two parts can be detachably connected; The locking mechanism (30) is fixed on the base plate (11) and corresponds to the port of each slot (111); after the insert arm (231) is inserted and matched with the slot (111), the locking mechanism (30) can be matched with the insert arm (231) and can selectively switch the guardrail assembly (20) and the support platform (10) between a fixed connection state and a movable connection state; The side of the insert arm (231) is provided with a plurality of toothed grooves (2311) arranged alternately in its length extension direction; the locking mechanism (30) includes a drive unit and a slider (33), which enables the drive unit to drive the slider (33) to reciprocate in the left-right direction relative to the base plate (11); on the slider (33), a plurality of teeth (331) are formed alternately on its side facing the slot (111); when the drive unit drives the slider (33) to reciprocate relative to the base plate (11), the plurality of teeth (331) can be simultaneously inserted into and simultaneously removed from the plurality of toothed grooves (2311); The base plate (11) is provided with a groove (112) for accommodating the drive unit and the slider (33), and an opening (1121) is formed on the side of the groove (112) near the slot (111); the drive unit is fixedly installed in the groove (112); the teeth (331) on the slider (33) can extend into the slot (111) through the opening (1121) and retract back into the groove (112); The drive unit includes an electromagnet (32) and an arm plate (311) fixed on the U-shaped frame (31), and a flat spring (312) sleeved on the arm plate (311). The U-shaped frame (31) is fixedly connected to the base plate (11), and the arm plate (311) extends toward the slot (111); The slider (33) is provided with a grooved rail (3331) that can be inserted and matched with the arm plate (311); the two ends of the flat spring (312) are in contact with the opposite end faces of the U-shaped frame (31) and the slider (33); on the slider (33), an armature part (332) is fixedly provided on its end face facing the U-shaped frame (31) and is arranged alternately and opposite to the magnetic surface of the electromagnet (32). Switching the on and off states of the electromagnet (32) can cause the slider (33) to move towards the U-shaped frame (31) under the action of magnetic attraction and to move away from the U-shaped frame (31) under the action of the spring force of the flat spring (312); The number of toothed grooves (2311) on any side of the insert arm (231) is greater than the number of teeth (331) on the corresponding matching slider (33); A pull rod structure is provided at the end of the crossbar (223) in the first part (221) and at the end of the crossbar (223) in the second part (222), and the pull rod structure can increase the length of the crossbar (223); sleeve one (2236) and sleeve two (2237) are respectively provided at the opposite ends of the pull rod structure in the first part (221) and the pull rod structure in the second part (222), and the opposite ends of sleeve one (2236) and sleeve two (2237) can be connected together by a threaded structure.

2. The adjustable lifting device for the guardrail according to claim 1, characterized in that: The guardrail assembly (20) also includes a plurality of telescopic rods (24) mounted on the base plate (23), and the plurality of telescopic rods (24) are arranged alternately along the length of the base plate (23): Multiple connecting rods (241) are provided between adjacent telescopic rods (24), and the connecting rods (241) are distributed alternately in the axial direction of the telescopic rods (24); a mesh (242) is provided between the connecting rods (241), and an end block (243) is provided at the end of the connecting rod (241). The lower end face of the base plate (11) is provided with a protrusion (114) that corresponds to the telescopic rod (24) and a shaped hole that can be inserted into the end block (243) on the protrusion (114).

3. The adjustable lifting device for the guardrail according to claim 2, characterized in that: A permanent magnet (1141) is fixedly provided at the inner end of the hole; an iron block is fixedly provided on the end face of the end block (243) facing the protrusion (114).

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