Fall alarm device and lifting platform

Abstract

The present application belongs to the technical field of falling early warning, and particularly relates to a falling alarm device and a lifting platform. The falling alarm device comprises a sliding seat, two lateral rods, a strip-shaped channel formed on the lateral rods, and a rim arm; a winding part comprising a reel pivotally matched with the two rim arms and a driving mechanism capable of driving the reel to rotate; a detection part comprising a support connecting rod, a sleeve, and a sensing unit; the two ends of the support connecting rod are connected with the lifting platform body after penetrating through the strip-shaped channel and are provided with elastic arms in contact with the sleeve; a sensitive body on the sensing unit is arranged on the elastic arm; the sensitive body can generate a physical quantity change when the elastic arm is elastically deformed; a mesh cloth is fixed at one end of the sleeve and at the other end of the reel and is wound on the reel; the driving mechanism can switchably wind the mesh cloth on the reel and release the mesh cloth from the reel. The present application helps to improve the anti-falling effect of the lifting platform, can issue a warning, ensures that the operating personnel can be rescued in time, and improves the operating safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of alarm devices, in particular to a falling alarm device and a lifting platform. BACKGROUND

[0002] Lifting platforms are often used in the field of high-altitude operation, requiring the operator to stand on the lifting platform and send the lifting platform to the height position required for operation through the hydraulic lifting system. The existing lifting platforms are usually provided with protective fences around the lifting platform to simply achieve the purpose of preventing falling. However, because the height of the protective fence cannot be too high, otherwise it will affect the construction of the operator. Therefore, the existing lifting platform provided with only the protective fence has very limited anti-falling effect. In operation, the operator generally takes the length direction (i.e. the longitudinal direction) of the lifting platform as the operation surface, so it is necessary to improve the protective structure of the longitudinal direction of the lifting platform. SUMMARY

[0003] In view of the poor anti-falling effect of the existing lifting platform, the present application provides a falling alarm device and a lifting platform, which can improve the anti-falling effect of the operation surface of the longitudinal direction of the lifting platform and can issue a warning, so as to ensure that the operator can be rescued in time and improve the operation safety of the lifting platform.

[0004] The technical solution adopted by the present application to solve the technical problem is: a falling alarm device, comprising:

[0005] The sliding seat comprises two transverse rods arranged opposite to each other, an end longitudinal rod fixedly connected to one end of the two transverse rods, and a middle longitudinal rod fixedly connected to the middle position of the two transverse rods; at the other end of the two transverse rods, a strip-shaped channel extending in the left-right direction is formed, and an arm extending upward is also formed;

[0006] The winding part comprises a winding shaft and a driving mechanism; the two ends of the winding shaft are pivotally matched with the free ends of the two arms, and the driving mechanism can drive the winding shaft to rotate; the winding shaft has two rotation directions of winding and releasing when rotating;

[0007] The detection part comprises a support link, a sleeve fitted on the support link, and a sensing unit; the two ends of the support link pass through the two strip-shaped channels arranged on the two transverse rods opposite to each other, and are fixedly connected with the lifting platform body; a plurality of elastic arms in arc shape are distributed on the outer circumferential surface of the support link, and the outer protruding surface of the elastic arm is in tangential contact with the inner circumferential surface of the sleeve; the sensitive body of the sensing unit is fixedly arranged on the inner concave surface of the elastic arm; the elastic filler is filled in the sleeve, and the elastic filler wraps the support link and the elastic arm inside; the sensitive body can produce a physical quantity change when the elastic arm is elastically deformed, so that the sensing unit generates a sensing signal and issues a warning signal;

[0008] The net cloth is fixed at one end to the outer circumferential surface of the sleeve and at the other end to the outer circumferential surface of the reel and wound around the reel; when the sliding seat slides relative to the lifting platform body in the left-right direction, the net cloth is switched to be wound around the reel and released from the reel under the action of the driving mechanism.

[0009] Optionally, the sensitive body is a strain gauge. The strain gauges arranged on the elastic arms are connected with the sensor bodies in the sensing unit.

[0010] Optionally, an arc-shaped groove is formed on the outer circumferential surface of the sleeve and an elastic pad is arranged in the arc-shaped groove. One end of the net cloth is in contact with the elastic pad and fixedly connected with the sleeve.

[0011] Optionally, a plurality of elastic ropes are arranged between the two front and rear opposite transverse rods and correspondingly at one end side of the elastic arms. The elastic ropes are distributed in the left-right direction and correspondingly below the net cloth.

[0012] Optionally, two elastic arms are arranged on the support connecting rod and distributed on the half outer circumferential surface of the support connecting rod on the side opposite to the direction in which the sleeve extends outward and arranged symmetrically in the up-down direction. In other words, the two elastic arms are distributed on the inner half outer circumferential surface of the support connecting rod and arranged symmetrically in the up-down direction.

[0013] The lifting platform comprises two above-mentioned falling alarm devices, and the two falling alarm devices are installed on the lower part of the lifting platform body in the left-right opposite direction.

[0014] The sliding seat and the lifting platform body are matched by the sliding rail structure arranged in the left-right direction. Meanwhile, a driving assembly matched with the end longitudinal rod on the sliding seat is fixedly arranged below the lower end surface of the lifting platform body, so that the driving assembly can drive the sliding seat to reciprocally slide relative to the lifting platform body.

[0015] The free ends of the elastic arms on the two sliding seats can correspondingly be kept in the state of being located outside the left side surface or the right side surface of the lifting platform body. Wedge surface parts can also be formed on the left side and the right side of the lower end surface of the lifting platform body, and the free end portions of the elastic arms on the left side and the right side can correspondingly be retracted below the wedge surface parts on the same side, so that the left end of the sliding block arranged on the left side can be retracted into the inside of the left side surface of the lifting platform body, and the right end of the sliding block arranged on the right side can be retracted into the inside of the right side surface of the lifting platform body, so that the left winding part and the right winding part can be retracted below the lower end surface of the lifting platform body. The wedge surface part should be understood as the end structure on the lower end surface of the lifting platform body.

[0016] Optionally, downwardly extending flanges are formed on both the front and rear sides of the lower end surface of the lifting platform body. The two ends of the two detection parts on the left and right sides are respectively matched with the left and right ends of the flanges on the front and rear sides.

[0017] Optionally, end blocks are fixedly provided at the left and right ends of the two edge plates respectively. The two ends of one detection unit correspond to and match the front and rear end blocks provided on the left side, respectively, and the two ends of the other detection unit correspond to and match the front and rear end blocks provided on the right side, respectively.

[0018] Two opposing clamping arms are formed on each end block. Two transverse rods on the slide can pass through the two opposing clamping arms on the same side and extend to the left or right end face of the lifting platform body, so that the end block can support and guide the slide.

[0019] Optionally, a support plate is provided on the lifting platform body on its left and right sides, and a cavity is formed between the upper end face of the support plate and the lower end face of the lifting platform body to accommodate the slide block. A slide rail structure corresponding to and matching the transverse rod is formed on the support plate, allowing the slide block to slide relative to the support plate and the lifting platform body in the left-right direction. The end longitudinal rods on both slide blocks can remain located in the cavity on the same side and can contact the upper and lower walls of the cavity.

[0020] The beneficial effects of the present invention are as follows: The fall alarm device of the present invention can effectively solve the defects of the existing lifting platform's poor fall prevention effect on both sides of the lifting platform and the inability to provide early warning; after being configured on the existing lifting platform, it can improve the fall prevention effect of the lifting platform, and can issue an early warning in time when a fall occurs, which helps to ensure that the fallen personnel are rescued in time, thus improving the safety of the operation and effectively preventing the accident from escalating. Attached Figure Description

[0021] Figure 1 A schematic diagram of the cross-sectional structure of the alarm device mounted on the lifting platform.

[0022] Figure 2 for Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0023] Figure 3 A partial transverse cross-sectional diagram of the alarm device mounted on the lifting platform.

[0024] Figure 4 This is a bottom view schematic diagram of the structure for matching the lifting platform and the end block.

[0025] Figure 5 This is a top view of the slide block.

[0026] Figure 6This is a schematic diagram of the main view cross-sectional structure of the end block.

[0027] Figure 7 This is a top view of the structure when two end blocks are matched.

[0028] Figure 8 A bottom view of the structure when the lifting platform, slide, and end block are matched.

[0029] Figure 9 This is a partially enlarged structural diagram of the upper end section of the slide.

[0030] Figure 10 This is a schematic diagram of the radial cross-sectional structure of the detection unit.

[0031] In the diagram: 10 Lifting platform body, 11 Support plate, 12 Cavity, 13 Assembly base plate, 14 Edge plate, 15 Wedge surface; 20 Slide seat, 21 Horizontal rod, 211 End section, 212 Elastic rope, 22 End longitudinal rod, 23 Middle longitudinal rod, 24 Strip channel, 25 Edge arm, 26 Rewinding section; 30 End block, 31 Detection section, 311 Support connecting rod, 312 Sleeve, 313 Elastic arm, 314 Sensitive element, 315 Arc groove, 316 Elastic pad, 317 Elastic filler, 32 Clamping arm; 40 Double rod cylinder, 41 Drive connecting rod; 50 Mesh fabric. Detailed Implementation

[0032] The structures, proportions, and sizes shown 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 implementation of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. In the related descriptions, unless otherwise specified, "horizontal" generally refers to... Figure 1 The left and right directions of a Chinese map, and the vertical direction generally refers to... Figure 1 The front-back direction / perpendicular direction of the drawing; at the same time, the terms such as "left", "right", "front", "back", "up", "down", "middle", "center" used in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships, without substantially changing the technical content, shall also be regarded as the scope of implementation of the present invention.

[0033] like Figures 1 to 3 , Figure 5 , Figures 8 to 10 The fall alarm device shown includes a slide 20, a winding section 26, a detection section 31, and a mesh 50.

[0034] The slide block 20 includes two transverse rods 21 arranged opposite each other, an end longitudinal rod 22 fixedly connected between one end of the two transverse rods 21, and a middle longitudinal rod 23 fixedly connected at the middle position of the two transverse rods 21. At the other end of each of the two transverse rods 21, a strip-shaped channel 24 extending in the left-right direction (i.e., in the transverse direction) and an upwardly inclined flange 25 are formed. The strip-shaped channel 24 and flange 25 on the two transverse rods 21 are arranged opposite each other.

[0035] The take-up section 26 includes a spool and a drive mechanism (not shown). The two ends of the spool are pivotally matched with two flanges 25, respectively, enabling the drive mechanism to drive the spool (relative to the flanges 25) to rotate.

[0036] The detection unit 31 includes a support rod 311, a sleeve 312 fitted onto the support rod 311, and a sensing unit. The two ends of the support rod 311 extend through two strip-shaped channels 24 provided on two opposing transverse rods 21, and are fixedly connected to the lifting platform body 10, allowing the transverse rods 21, or the slide block 20, to slide relative to the support rod 311 in a left-right direction. Multiple arc-shaped elastic arms 313 are distributed on the outer circumferential surface of the support rod 311, with the outer protruding surfaces of the elastic arms 313 tangentially contacting the inner circumferential surface of the sleeve 312. A sensitive element 314 from the sensing unit is fixedly mounted on the concave surface of the elastic arm 313. The sensitive element 314 can be a strain gauge. The sleeve 312 is filled with an elastic filler 317, which encloses the support rod 311 and the elastic arms 313 within it.

[0037] like Figure 10 As shown, two elastic arms 313 are provided on the support rod 311, and the two elastic arms 313 are distributed on the outer half of the support rod 311 at a position opposite to the direction in which the mesh 50 extends outward relative to the sleeve 312, and are arranged symmetrically up and down. Figure 10 In this configuration, the direction in which the mesh fabric 50 extends outward relative to the sleeve 312 is to the left, and the opposite direction is to the right. Therefore, the two elastic arms 313 are positioned on the outer circumferential surface of the right half of the supporting link 311, and are arranged symmetrically vertically. In other words, even if the two elastic arms 313 are distributed on the outer circumferential surface of the inner half of the supporting link 311 (relative to the lifting platform body 10, since the detection part 31 is assembled between the left and right sides of the lifting platform body 10, in the left-right direction, the direction relatively away from the left and right sides of the lifting platform body 10 is considered the inner side; conversely, the direction relatively close to the left and right sides of the lifting platform body 10 is considered the outer side), the two elastic arms 313 are positioned on the outer circumferential surface of the supporting link 311.

[0038] The elastic filler 317 is a foamed material that is filled into the cavity of the sleeve 312 in a foamed state, encasing the middle part of the support rod 311 (corresponding to the part between the two transverse rods 21) and the elastic arm 313. After curing, it forms the elastic filler 317 (or elastic filler layer). The sensing element 314 can generate a change in physical quantity when the elastic arm 313 undergoes elastic deformation, thereby enabling the sensing unit to generate a sensing signal and issue an early warning signal.

[0039] After the sleeve 312 is filled with the elastic filler 317, the elastic filler 317 can effectively suppress the excessive deformation of the elastic arm 313 caused by the impact force transmitted to the sleeve 312 after the mesh fabric 50 is subjected to impact / impact. This protects the elastic arm 313. At the same time, the elastic deformation properties of the elastic filler 317 can create conditions for the elastic arm 313 to undergo elastic deformation without affecting the elastic arm 313's design function.

[0040] Multiple sensitive elements 314 on the elastic arms 313 are connected to the sensor body in the sensing unit. When a physical quantity changes in the sensitive element 314, the sensor body generates a sensing signal, which is transmitted to the processor in the sensing unit. The processor can analyze and process the sensing signal to determine whether to issue a warning. Therefore, the sensing unit is connected to an external alarm, which can be a physical alarm, such as an audible and visual alarm, and / or a virtual alarm unit configured in a remote control terminal.

[0041] One end of the mesh fabric 50 is fixed to the outer circumferential surface of the sleeve 312, and the other end is fixed to the outer circumferential surface of the reel and can be wound around the reel. When the slide block 20 slides relative to the lifting platform body 10 in the left-right direction (driven by external force), under the action of the driving mechanism, the mesh fabric 50 can be switched between being wound around the reel and being released from the reel, thereby achieving the purpose of stretching and unwinding the mesh fabric 50 and winding it up. The width of the mesh fabric 50 (the dimensional parameter in the front-back direction) is adapted to the axial length of the section of the support link 311 between the two front-back opposite transverse bars 21.

[0042] The mesh fabric 50 is wound around the spool of the take-up section 26. The power component of the drive mechanism can be a torsion spring (which can also be called an energy storage component) or a gear transmission structure driven by a motor, etc., capable of driving the spool to rotate clockwise and counterclockwise. If a torsion spring is configured on the take-up section 26 to drive the spool to rotate, the drive mechanism containing the torsion spring is generally arranged on both ends of the spool. In the initial state, the mesh fabric 50 is kept wound around the spool. During the process of the mesh fabric 50 being unwound from the spool, the torsion spring can undergo elastic deformation (energy storage). Finally, when the slide 20 moves towards the side closer to the lifting platform body 10, the torsion spring drives the mesh fabric 50 to rewrap / rewind onto the spool. In summary, according to the design purpose of the take-up section 26 of the present invention, those skilled in the art can refer to the prior art for the detailed structure of the drive mechanism in the take-up section 26, which will not be described in detail here.

[0043] In the above scheme, the mesh fabric 50 can slide relative to the lifting platform body 10 in the left and right direction along with the slide block 20. With the help of the drive mechanism on the winding section 26, the mesh fabric 50 can switch between a state of being wound / wound on the reel and a state of being unwound and unfolded from the reel. During operation, the mesh fabric 50 can extend outward relative to the lifting platform body 10, maintaining a stretched and unfolded state. It also corresponds to the area below the longitudinal working surfaces on both sides of the lifting platform body 10, providing good fall protection. Figure 3 , Figure 9 The state shown; and the ability to restore the mesh fabric 50 to its original winding position on the reel after the operation is completed, and to be stored away (as shown). Figure 1 , Figure 2 , Figure 8 (As shown in the figure) will not affect the normal lifting and lowering operation of the lifting platform body 10.

[0044] The strip channel 24 can provide a clearance travel range for the sliding action of the transverse rod 21 relative to the lifting platform body 10, and can prevent the support link 311 from interfering with the sliding action of the slide block 20.

[0045] An arc-shaped groove 315 is formed on the outer circumferential surface of the sleeve 312, and an elastic pad 316 is provided within the arc-shaped groove 315. One end of the mesh fabric 50 is in full contact with the outer surface of the elastic pad 316 and is fixedly connected to the sleeve 312 by screws / rivets or bolts. Figure 10 As shown, the length of the arc-shaped groove 315 extending in the circumferential direction is such that its central angle is greater than 90 degrees, preferably greater than 270 degrees (see [reference]). Figure 10The outer surface of the elastic pad 316 can protrude radially outward relative to the outer circumferential surface of the sleeve 312, with the radial dimension of the protrusion controlled within 2mm. One end of the mesh fabric 50 is folded into multiple layers and placed over the outer surface of the elastic pad 316, ensuring the length of the folded section is not less than the circumferential length of the arc-shaped groove 315. Then, bolts / rivets or screws are used to fix the end of the mesh fabric 50 to the sleeve 312.

[0046] After the elastic pad 316 is set, the tensile strength of the mesh fabric 50 can be improved, making it less likely to be torn or broken when subjected to impact. It can also improve the connection strength and reliability between the mesh fabric 50 and the sleeve 312. At the same time, it can increase the relative friction between the mesh fabric 50 and the sleeve 312, so that when the mesh fabric 50 is impacted, the force existing in the extension length direction of the mesh fabric 50 (on the left and right defense lines) can be transmitted to the sleeve 312, causing the sleeve 312 to move radially relative to the support link 311, and compressing the elastic filler 317 and the elastic arm 313 to produce a relatively larger elastic deformation.

[0047] like Figure 3 As shown, multiple elastic ropes 212 are provided between two opposing transverse bars 21, corresponding to the end of the transverse bar 21 where the flange 25 is located. In the illustration, the multiple elastic ropes 212 are located between the end sections 211 of the two transverse bars 21. The end section 211 is a segment on the transverse bar 21 located on the outer side of the central longitudinal bar 23. Figure 1 In the illustrated scheme, the strip-shaped channel 24 is located on the end section 211. Multiple elastic ropes 212 are distributed alternately in the left-right direction and correspond to the area below the mesh 50. After multiple elastic ropes 212 are arranged between the transverse bars 21, an elastic buffer layer can be formed below the mesh 50, which can improve the elastic buffering performance of the fall alarm device on the one hand, and form a secondary protection structure on the other hand, improving the fall prevention effect and safety.

[0048] The mesh fabric 50 is preferably made of a protective fabric with certain elastic deformation properties and good toughness, so that it has elastic buffering ability to prevent the detection part 31 and the winding part 26 from being easily damaged when the mesh fabric 50 is subjected to violent impact.

[0049] The present invention also relates to a lifting platform comprising a pair of the aforementioned fall alarm devices, wherein the two fall alarm devices are mounted on the lower end face of the lifting platform body 10, facing each other from left to right.

[0050] The slide block 20 and the lifting platform body 10 are matched by a slide rail structure arranged in the left-right direction, and the end longitudinal rods 22 on the two slide blocks 20 are arranged opposite each other from left to right, and can maintain a state in which they are located below the lower end surface of the lifting platform body 10. See [reference needed]. Figure 3 The free ends of the flanges 25 on the two slide blocks 20 can be positioned relative to each other on the left side or right side of the lifting platform body 10. Wedge-shaped surfaces 15 can also be provided on the left and right sides of the lower end face of the lifting platform body 10, allowing the flanges 25 on both sides to retract below the wedge-shaped surfaces 15 on the same side. This allows the left end of the slider 20 on the left side to retract into the left side of the lifting platform body 10, and the right end of the slider 20 on the right side to retract into the right side of the lifting platform body 10. (See [reference needed]). Figure 1 .

[0051] A drive assembly matching the end longitudinal rod 22 on the slide 20 is fixedly provided below the lower end face of the lifting platform body 10, so that the drive assembly can drive the slide 20 to reciprocate relative to the lifting platform body 10. Specifically, the slide 20 located on the left side can extend to the left outside the lifting platform body 10, with its end section 211 extending beyond the left side of the lifting platform body 10, and actuating the winding portion 26 disposed between the left-side flanges 25, causing the mesh fabric 50 to be released from the roll and unfolded to form the left-side protective mesh fabric structure. Similarly, the slide 20 located on the right side can extend to the right outside the lifting platform body 10, with its end section 211 extending beyond the right side of the lifting platform body 10, and actuating the winding portion 26 disposed between the right-side flanges 25, causing the mesh fabric 50 to be released from the roll and unfolded to form the right-side protective mesh fabric structure. The drive assembly is a double-rod cylinder 40 (which can be a pneumatic double-rod cylinder, a hydraulic double-rod cylinder, or an electric double-rod cylinder), enabling the drive assembly to drive the left and right sliding blocks 20 to move synchronously, causing the mesh fabric 50 on the two sliding blocks 20 to unfold simultaneously to form a protective mesh fabric structure, and to be simultaneously wound up on their respective reels. An assembly base plate 13 is provided at the lower part of the lifting platform body 10, and the double-rod cylinder 40 is fixed to the assembly base plate 13.

[0052] On the lower end surface of the lifting platform body 10, downwardly extending flanges 14 are formed on both the front and rear sides. The two ends of the support connecting rods 311 in the two detection sections 31 on the left and right sides respectively mate with the flanges 14 on the front and rear sides, thereby fixing the detection sections 31 on the left and right sides of the lifting platform body 10, and positioning the sleeve 312 between the front and rear flanges 14. Figures 1 to 4 , Figures 6 to 8As shown, a pair of end blocks 30 are fixedly provided between the left and right ends of the two opposing edge plates 14. In other words, an end block 30 is fixedly provided at the left and right ends of the two opposing edge plates 14. The front and rear ends of the detection part 31 on the left side are matched with the pair of end blocks 30 on the left side, and the front and rear ends of the detection part 31 on the right side are matched with the pair of end blocks 30 on the right side. That is, the two ends of the support connecting rod 311 on one detection part 31 pass through the strip channel 24 and are matched with the two end blocks 30 on the left side, and the two ends of the support connecting rod 311 on the other detection part 31 pass through the strip channel 24 and are matched with the two end blocks 30 on the right side. The sleeve 312 is located between the end sections 211 on the two transverse rods 21. The outer end of the slider 20 can slide between the two opposing end blocks 30. Specifically, two opposing clamping arms 32 are formed on the end block 30, so that the two transverse rods 21 (upper end sections 211) on the slider 20 pass between the two clamping arms 32. The two clamping arms 32 can support the transverse rods 21, weakening the adverse effects caused by the cantilever effect after the transverse rods 21 extend outward relative to the lifting platform body 10. This helps to optimize the stress state of the slide block 20 when it plays a role in preventing falls, and can improve the safety and reliability of the fall prevention effect.

[0053] like Figures 1 to 8 As shown, a support plate 11 is provided on the lifting platform body 10 on both the left and right sides, and a cavity 12 is formed between the upper end surface of the support plate 11 and the lower end surface of the lifting platform body 10 to accommodate the slide block 20. A slide rail structure corresponding to and matching the transverse rod 21 is formed on the support plate 11, allowing the slide block 20 to slide relative to the support plate 11 and the lifting platform body 10 in the left-right direction. The support plate 11 and the lifting platform body 10 are fixedly connected by a connecting arm plate. During the reciprocating sliding of the slide block 20 relative to the lifting platform body 10 in the left-right direction, the end longitudinal rods 22 on the slide block 20 can remain in the cavity 12, and at least the upper and lower end surfaces of the end longitudinal rods 22 can maintain contact with the upper and lower walls of the cavity 12. The two cylinder rods of the double-rod cylinder 40 are provided with driving connecting rods 41, and the ends of the driving connecting rods 41 extend into the cavity 12 and connect with the end longitudinal rods 22 on the slide block 20.

[0054] By setting the support plate 11 and the cavity 12, and keeping the end longitudinal rod 22 on the slide 20 in contact with the upper and lower walls of the cavity 12, support is provided for the inner end of the slide 20. This optimizes the stress condition of the slide 20 (when it extends to the outside of the lifting platform body 10), allowing the fall alarm device to remain stably and reliably matched with the lifting platform body 10, and preventing it from deforming and failing due to strong impact forces. In particular, the simultaneous configuration of the end block 30 and the clamping arm 32 further improves the stress condition of the slider 20.

[0055] like Figure 1 As shown, a support plate 11 extending to the left and a support plate 11 extending to the right are formed below the lifting platform body 10. The cavity 12 is formed between the support plate 11 and the opposite surface of the lifting platform body 10. Figure 1 , Figure 4 , Figure 8 In the illustrated scheme, two trays 11 are configured, with their width direction along the left-right direction and their length direction along the front-back direction, and the length direction of the two trays 11 extending longitudinally through the length direction of the lifting platform body 10. In other embodiments, four trays 11 may be configured, distributed at the four corners of the lifting platform body 10. Two slides 20 are respectively configured in the left and right cavities 12, and the two slides 20 can slide linearly relative to the lifting platform body 20 in the left-right direction.

[0056] 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. A fall alarm device, characterized in that, include: The slide (20) includes two transverse rods (21) arranged opposite to each other, an end longitudinal rod (22) that is fixedly connected to one end of the two transverse rods (21), and a middle longitudinal rod (23) that is fixedly connected to the middle position of the two transverse rods (21); at the other end of the two transverse rods (21), a strip-shaped channel (24) extending in the left-right direction is formed, and an upwardly inclined flange (25) is formed. The take-up section (26) includes a spool and a drive mechanism; the two ends of the spool are pivotally matched with two edge arms (25) respectively, and the drive mechanism can drive the spool to rotate. The detection unit (31) includes a support rod (311), a sleeve (312) fitted on the support rod (311), and a sensing unit; the two ends of the support rod (311) pass through two strip-shaped channels (24) set on two opposing transverse rods (21) and are fixedly connected to the lifting platform body (10); a plurality of arc-shaped elastic arms (313) are distributed on the outer circumferential surface of the support rod (311), and the outer protruding surface of the elastic arm (313) is tangentially contacted with the inner circumferential surface of the sleeve (312); a sensitive element (314) on the sensing unit is fixedly provided on the concave surface of the elastic arm (313); an elastic filler (317) is filled in the sleeve (312), and the elastic filler (317) wraps the support rod (311) and the elastic arm (313) inside it; The sensitive body (314) can generate a change in physical quantity when the elastic arm (313) undergoes elastic deformation, thereby enabling the sensing unit to generate a sensing signal and issue an early warning signal; The mesh (50) is fixed at one end to the outer circumferential surface of the sleeve (312) and at the other end to the outer circumferential surface of the spool and wound around the spool. When the slide (20) slides relative to the lifting platform body (10) in the left and right direction, under the action of the drive mechanism, the mesh (50) can be switched between being wound around the spool and being released from the spool.

2. The fall alarm device according to claim 1, characterized in that: The sensitive element (314) is a strain gauge; the strain gauges on the elastic arm (313) are all connected to the sensor body in the sensing unit.

3. The fall alarm device according to claim 1, characterized in that: An arc-shaped groove (315) is formed on the outer circumferential surface of the sleeve (312), and an elastic pad (316) is provided in the arc-shaped groove (315); one end of the mesh (50) contacts the elastic pad (316) and is fixedly connected to the sleeve (312).

4. The fall alarm device according to claim 1, characterized in that: Between two opposing transverse bars (21), and on one end of the transverse bar (21) where an arm (25) is provided, multiple elastic ropes (212) are provided; the multiple elastic ropes (212) are distributed alternately in the left and right directions and can be located below the netting (50).

5. The fall alarm device according to any one of claims 1 to 4, characterized in that: Two elastic arms (313) are provided on the support link (311), and the two elastic arms (313) are distributed on the outer half of the support link (311) in the opposite direction to the direction of the sleeve (312) extending outward from the mesh (50), and are arranged symmetrically up and down.

6. A lifting platform, characterized in that: Includes the fall alarm device as described in any one of claims 1 to 4; the number of fall alarm devices is two, and they are installed on the lower part of the lifting platform body (10) from left to right opposite each other; The slide (20) and the lifting platform body (10) are matched by a slide rail structure arranged in the left and right direction; so that the end longitudinal rods (22) on the two slides (20) are arranged opposite each other and can maintain a state of being located below the lower end face of the lifting platform body (10); A drive assembly matching the end longitudinal rod (22) on the slide (20) is fixedly provided below the lower end face of the lifting platform body (10), so that the drive assembly can drive the slide (20) to reciprocate relative to the lifting platform body (10).

7. The lifting platform according to claim 6, characterized in that: Wedge-shaped surfaces (15) are formed on the left and right sides of the lower end face of the lifting platform body (10), so that the left and right side flanges (25) can be retracted into the wedge-shaped surfaces (15) on the same side.

8. The lifting platform according to claim 7, characterized in that: On the lower end face of the lifting platform body (10), downward extending edge plates (14) are formed on both the front and rear sides; the two ends of the two detection parts (31) on the left and right sides are respectively matched with the edge plates (14) on the front and rear sides.

9. The lifting platform according to claim 8, characterized in that: End blocks (30) are fixedly provided at the left and right ends of the two edge plates (14); the two ends of one detection part (31) are respectively matched with the front and rear end blocks (30) provided on the left side, and the two ends of the other detection part (31) are respectively matched with the front and rear end blocks (30) provided on the right side. Two opposing clamping arms (32) are formed on the end block (30), and the transverse rod (21) on the slide (20) can pass between the two opposing clamping arms (32).

10. The lifting platform according to any one of claims 6 to 9, characterized in that: A support plate (11) is provided on the lifting platform body (10) on the left and right sides respectively, and a cavity (12) capable of accommodating the slide (20) is formed between the upper end face of the support plate (11) and the lower end face of the lifting platform body (10); a slide rail structure corresponding to and matching the transverse rod (21) is formed on the support plate (11); the end longitudinal rod (22) on the slide (20) can be kept in the cavity (12) and can contact the upper and lower walls of the cavity (12).

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