Falling alarm device and lifting platform

Abstract

The invention 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 and an edge arm, the sliding seat comprises two transverse rods, and strip-shaped channels are formed in the transverse rods; the winding part comprises a winding shaft matched with the two edge arms in a pivoted mode and a driving mechanism capable of driving the winding shaft to rotate; the detection part comprises a supporting connecting rod, a sleeve and a sensing unit; the two ends of the supporting connecting rod penetrate out of the strip-shaped channels, then are connected with the lifting table body and are provided with elastic arms making contact with the sleeves. A sensitive body on the sensing unit is arranged on the elastic arm; the sensitive body can generate physical quantity change when the elastic arm elastically deforms; one end of the screen cloth is fixed on the sleeve, and the other end of the screen cloth is fixed on the reel and wound on the reel; and the driving mechanism can enable the screen cloth to be wound on the reel and released from the reel in a switching manner. According to the anti-falling device, the anti-falling effect of the lifting platform can be improved, early warning can be given out, it is ensured that operators are rescued in time, and operation safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of alarm devices, and in particular to a fall alarm device and a lifting platform. Background Art

[0002] Lifting platforms are often used in the field of aerial work, requiring operators to stand on the lifting platform and use the hydraulic lifting system to send the lifting platform to the height required for the operation. Most existing lifting platforms will be equipped with guardrails around the lifting platform to simply achieve the purpose of fall prevention. However, because the height of the guardrail cannot be too high, otherwise it will affect the construction of the operators. Therefore, the existing lifting platforms that are only equipped with guardrails have very limited fall prevention effects. During the operation, the operators generally use the two sides of the length direction (i.e. longitudinal direction) of the lifting platform as the working surface, so it is very necessary to improve the protective structure on both sides of the longitudinal direction of the lifting platform. Summary of the invention

[0003] In view of the problem that the existing lifting platform has poor anti-fall effect, the present invention provides a fall alarm device and a lifting platform, which help to improve the anti-fall effect of the working surfaces on both longitudinal sides of the lifting platform and can issue an early warning to ensure that the workers receive timely rescue, thereby improving the operating safety of the lifting platform.

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

[0005] The slide seat comprises two transverse rods arranged front and back oppositely, an end longitudinal rod fixedly connecting one end of the two transverse rods, and a middle longitudinal rod fixedly connecting the middle position of the two transverse rods; at the other ends of the two transverse rods, a strip-shaped groove extending in the left-right direction is formed, and an edge arm extending obliquely upward is formed;

[0006] The reeling part includes a reel and a driving mechanism; the two ends of the reel are respectively pivotally matched with the free ends of the two edge arms, and the driving mechanism can drive the reel to rotate; when the reel rotates, it has two rotation directions of reeling and releasing;

[0007] The detection part includes a supporting link, a sleeve sleeved on the supporting link, and a sensing unit; the two ends of the supporting link correspondingly pass through two strip-shaped grooves arranged on two transverse rods opposite to each other in the front and rear, and are fixedly connected to the lifting platform body; a plurality of arc-shaped elastic arms are distributed on the outer peripheral surface of the supporting link, and the outer protruding surface of the elastic arm is tangentially in contact with the inner peripheral surface of the sleeve; a sensitive body of the sensing unit is fixed on the inner concave surface of the elastic arm; the sleeve is filled with an elastic filler, and the elastic filler wraps the supporting link and the elastic arm inside; the sensitive body can produce a physical quantity change when the elastic arm undergoes elastic deformation, so that the sensing unit generates a sensing signal and sends out an early warning signal;

[0008] One end of the mesh is fixed on the outer circumference of the sleeve, and the other end is fixed on the outer circumference of the reel and wound on the reel; when the slide seat slides in the left and right directions relative to the lifting platform body, under the action of the driving mechanism, the mesh can be switched to be wound on the reel and released from the reel.

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

[0010] Optionally, an arc groove is formed on the outer peripheral surface of the sleeve and an elastic pad is arranged in the arc groove. One end of the mesh cloth contacts the elastic pad and is fixedly connected to the sleeve.

[0011] Optionally, a plurality of elastic ropes are arranged between two front and rear opposite transverse rods and corresponding to the end side where the edge arm is arranged, so that the elastic ropes are alternately distributed in the left and right directions and can correspond to the bottom of the mesh.

[0012] Optionally, two elastic arms are provided on the supporting link, and the two elastic arms are distributed on the half outer circumference of the supporting link in the direction opposite to the direction in which the mesh cloth extends outward from the sleeve and are arranged symmetrically up and down. In other words, the two elastic arms are distributed on the inner half outer circumference of the supporting link and are arranged symmetrically up and down.

[0013] A lifting platform comprises two of the above-mentioned fall alarm devices, and the two fall alarm devices are installed oppositely on the lower part of the lifting platform body.

[0014] The slide seat and the lifting platform body are matched with each other through a slide rail structure arranged in the left and right directions. At the same time, a driving assembly matching with the end longitudinal rod on the slide seat is fixed below the lower end surface of the lifting platform body, so that the driving assembly can drive the slide seat to slide back and forth relative to the lifting platform body.

[0015] The free ends of the edge arms on the two slides can be kept relatively outside the left side or right side of the lifting platform body. Wedge face portions can be formed on the left and right sides of the lower end surface of the lifting platform body, respectively, and the free ends of the edge arms on the left and right sides can be correspondingly retracted under the wedge face portions on the same side, so that the left end of the slider on the left side can be retracted into the inner side of the left side surface of the lifting platform body, and the right end of the slider on the right side can be retracted into the inner side of the right side surface of the lifting platform body, and ultimately the winding part on the left side and the winding part on the right side can be retracted to the lower side of the lower end surface of the lifting platform body. The wedge face portion should be understood as an end structure on the lower end surface of the lifting platform body.

[0016] Optionally, the lower end surface of the lifting platform body is provided with downwardly extending edge plates at the front and rear sides. 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 edge plates on the front and rear sides.

[0017] Optionally, end blocks are fixedly arranged at the left and right ends of the two edge plates. The two ends of one detection part are matched with the front and rear end blocks arranged on the left side, and the two ends of the other detection part are matched with the front and rear end blocks arranged on the right side.

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

[0019] Optionally, a support plate is provided on the lifting platform body and on the left and right sides thereof, and a cavity capable of accommodating the slide is formed between the upper end surface of the support plate and the lower end surface of the lifting platform body. A slide rail structure corresponding to the transverse rod is formed on the support plate, so that the slide can slide in the left and right directions relative to the support plate and the lifting platform body. The end longitudinal rods on the two slides can both remain 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 involved in the present invention can effectively solve the defects of the existing lifting platform, that is, the anti-fall effect of the working surfaces on both sides of the longitudinal direction of the lifting platform is poor and no early warning can be given; after being configured on the existing lifting platform, it can improve the anti-fall 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, thereby improving the safety of the operation and effectively preventing the deterioration of accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the transverse cross-sectional structure of the alarm device configured on the lifting platform.

[0022] Figure 2 for Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0023] Figure 3 This is a schematic diagram of the partial transverse section structure of the alarm device configured on the lifting platform.

[0024] Figure 4 This is a schematic diagram of the upward-looking structure of the lifting platform and the end blocks.

[0025] Figure 5 It is a schematic diagram of the structure of the slide from a top view.

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

[0027] Figure 7 It is a schematic diagram of the top view structure when two pairs of end blocks are matched.

[0028] Figure 8 This is a schematic diagram of the upward structure when the lifting platform, slide seat and end block are matched.

[0029] Fig. 9 It is a schematic diagram of the partially enlarged structure of the upper end section of the slide.

[0030] Fig.10 It is a schematic diagram of the radial cross-sectional structure of the detection part.

[0031] In the figure: 10 lifting platform body, 11 supporting plate, 12 cavity, 13 assembly bottom plate, 14 edge plate, 15 wedge surface part; 20 sliding seat, 21 transverse rod, 211 end section, 212 elastic rope, 22 end longitudinal rod, 23 middle longitudinal rod, 24 strip groove, 25 edge arm, 26 winding part; 30 end block, 31 detection part, 311 supporting connecting rod, 312 sleeve, 313 elastic arm, 314 sensitive body, 315 arc groove, 316 elastic pad, 317 elastic filler, 32 clamping arm; 40 double-rod cylinder, 41 driving connecting rod; 50 mesh cloth. DETAILED DESCRIPTION

[0032] The structures, proportions, sizes, etc. shown in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with the technology to understand and read. They are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that the present invention can produce. In the relevant description, unless otherwise specified, horizontal generally refers to Figure 1 The left and right directions of the middle figure, the vertical direction generally refers to Figure 1 The front-to-back direction of the drawing / the direction perpendicular to the drawing; at the same time, the terms such as "left", "right", "front", "back", "up", "down", "middle", "middle" etc. cited in this specification are only for the convenience of description and are not used to limit the scope of the invention. Changes or adjustments in their relative relationships should be regarded as the scope of the invention without substantially changing the technical content.

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

[0034] The slide seat 20 includes two transverse rods 21 arranged opposite to each other in the front and rear direction, an end longitudinal rod 22 fixedly connected between the ends 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 ends of the two transverse rods 21, a strip groove 24 extending in the left-right direction (i.e., in the transverse direction) and an edge arm 25 extending obliquely upward are formed. The strip groove 24 and the edge arm 25 on the two transverse rods 21 opposite to each other in the front and rear direction are opposite to each other in the front and rear direction.

[0035] The reeling unit 26 includes a reel and a driving mechanism (not shown). The two ends of the reel are respectively pivotally matched with the two edge arms 25, and the driving mechanism can drive the reel (relative to the edge arms 25) to rotate.

[0036] The detection part 31 includes a supporting link 311, a sleeve 312 sleeved on the supporting link 311, and a sensing unit. The two ends of the supporting link 311 respectively penetrate two strip grooves 24 provided on two transverse rods 21 opposite to each other in the front and rear directions, and are fixedly connected to the lifting platform body 10, so that the transverse rod 21 or the slide 20 can slide in the left and right directions relative to the supporting link 311. A plurality of arc-shaped elastic arms 313 are distributed on the outer peripheral surface of the supporting link 311, and the outer protruding surface of the elastic arm 313 is tangentially in contact with the inner peripheral surface of the sleeve 312. A sensitive body 314 on the sensing unit is fixedly provided on the inner concave surface of the elastic arm 313. The sensitive body 314 can be selected as a strain gauge. The sleeve 312 is filled with an elastic filler 317, and the elastic filler 317 can wrap the supporting link 311 and the elastic arm 313 inside it.

[0037] like Fig.10 As shown, two elastic arms 313 are provided on the support link 311, and the two elastic arms 313 are distributed on the half-side outer circumference of the support link 311 in the direction opposite to the direction in which the mesh 50 extends outward relative to the sleeve 312, and are arranged symmetrically up and down. Fig.10 In the embodiment, the direction in which the mesh 50 extends outward relative to the sleeve 312 is the left, and the direction opposite to the direction in which the mesh 50 extends relative to the sleeve 312 is the right, so the two elastic arms 313 are arranged on the outer circumference of the right half of the support link 311, and the two elastic arms 313 are arranged symmetrically up and down. In other words, even if the two elastic arms 313 are distributed on the inner half of the support link 311 (relative to the lifting platform body 10, since the detection unit 31 is assembled between the left and right side surfaces of the lifting platform body 10, in the left and right directions, the direction relatively away from the left and right side surfaces of the lifting platform body 10 is the inner side; conversely, the direction relatively close to the left and right side surfaces of the lifting platform body 10 is the outer side) outer circumference.

[0038] The elastic filler 317 is a foaming material, which is filled into the tube cavity of the sleeve 312 in a foaming state, wrapping the middle part of the supporting connecting rod 311 (corresponding to the part between the two transverse rods 21) and the elastic arm 313, and can form the elastic filler 317 (or elastic filling layer) after solidification. The sensitive body 314 can produce a physical quantity change when the elastic arm 313 undergoes elastic deformation, so that the sensor unit can generate a sensor signal and send out an early warning signal.

[0039] After the sleeve 312 is filled with the elastic filler 317, the elastic filler 317 can wrap the elastic arm 313 to effectively prevent the impact force transmitted and acting on the sleeve 312 after the mesh 50 is impacted / impacted, which causes the elastic arm 313 to be excessively deformed, thereby protecting the elastic arm 313. At the same time, the elastic deformation performance of the elastic filler 317 can create conditions for the elastic arm 313 to be elastically deformed, and will not affect the elastic arm 313 from performing its designed function.

[0040] The sensitive bodies 314 on the multiple elastic arms 313 are all connected to the sensor body in the sensing unit. When the sensitive body 314 produces a physical quantity change, the sensor body can generate a sensing signal and transmit it to the processor in the sensing unit. The processor can analyze and process the sensing signal to determine whether to issue an early 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 50 is fixed on the outer circumference of the sleeve 312, and the other end is fixed on the outer circumference of the reel and can be wound on the reel. When the slide 20 slides in the left and right direction relative to the lifting platform body 10 (driven by external force), the mesh 50 can be switched to be wound on the reel and released from the reel under the action of the driving mechanism, so as to achieve the purpose of stretching and rolling up the mesh 50. The width of the mesh 50 (the dimension parameter in the front-to-back direction) is adapted to the axial length of a section of the support link 311 between the two front-to-back opposite transverse rods 21.

[0042] The mesh 50 is wound on the reel of the reel 26, and the power component of the driving mechanism can be a torsion spring (which can also be called an energy storage component) or a gear transmission structure driven by a motor, which can drive the reel to rotate leftward in the clockwise and counterclockwise directions. If a torsion spring is configured on the reel 26 to drive the reel to rotate, the driving mechanism containing the torsion spring is generally configured on both ends of the reel, and in the initial state, the mesh 50 can be kept in a state of being wound on the reel, and in the process of the mesh 50 being released and unfolded from the reel, the torsion spring can undergo elastic deformation (energy storage), and finally when the slide 20 moves toward the side close to the lifting platform body 10, the mesh 50 can be driven to be rewound / reeled on the reel with the help of the torsion spring. In short, according to the design purpose of the reel 26 of the present invention, those skilled in the art can refer to the prior art, specifically the detailed structure of the driving mechanism in the reel 26, so it will not be repeated.

[0043] In the above scheme, the mesh cloth 50 can slide along the left and right directions relative to the lifting platform body 10 along with the slide seat 20, and with the help of the driving mechanism on the winding part 26, the mesh cloth 50 can be switched between the state of being wound / wound up on the reel and the state of being released and unfolded from the reel, and the mesh cloth 50 can be extended outward relative to the lifting platform body 10 during the operation, maintained in the elongated and unfolded state, and can correspond to the lower side of the working surface on both sides of the lifting platform body 10 in the longitudinal direction, so as to play a good anti-fall protection role, such as Figure 3 , Fig. 9 and the mesh 50 can be restored to a state wound on the reel after the operation is completed, and is stored (such as Figure 1 , Figure 2 , Figure 8 The normal lifting action of the lifting platform body 10 will not be affected.

[0044] The strip-shaped groove 24 can provide a clearance travel range for the sliding movement of the transverse rod 21 relative to the lifting platform body 10 , and can prevent the supporting connecting rod 311 from interfering with the sliding movement of the sliding seat 20 .

[0045] An arc groove 315 is formed on the outer circumference of the sleeve 312 and an elastic pad 316 is provided in the arc groove 315. One end of the mesh 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. Fig.10 As shown, the length of the arc groove 315 extending in the circumferential direction is such that its central angle is greater than 90 degrees, preferably greater than 270 degrees (see Fig.10). The outer surface of the elastic pad 316 can be made to protrude radially outward relative to the outer circumferential surface of the sleeve 312, and the radial dimension of the protrusion is controlled within 2 mm. After one end of the mesh 50 is folded into multiple layers, it is covered on the outer surface of the elastic pad 316, and the length of the folded section is not less than the circumferential length of the arc groove 315, and then the end of the mesh 50 is fixed to the sleeve 312 using bolts / rivets or screws.

[0046] After the elastic pad 316 is provided, the tensile strength of the mesh 50 can be improved, and it is not easy to be torn or broken when subjected to impact, and the connection firmness and reliability between the mesh 50 and the sleeve 312 can be improved; at the same time, the relative friction between the mesh 50 and the sleeve 312 can be increased, so that after the mesh 50 is impacted, the force existing in the extension length direction of the mesh 50 (on the left and right defense lines) can be transmitted to the sleeve 312, so as to cause the sleeve 312 to move radially relative to the supporting link 311, and compress the elastic filler 317 and the elastic arm 313 to produce a relatively larger elastic deformation.

[0047] like Figure 3 As shown, a plurality of elastic ropes 212 are provided between two front and rear opposite transverse rods 21 and at one end side of the transverse rod 21 corresponding to the edge arm 25. In the figure, the plurality of elastic ropes 212 correspond to the end sections 211 of the two transverse rods 21. The end section 211 is a section of the transverse rod 21 that is relatively located outside the middle longitudinal rod 23. Figure 1 In the illustrated solution, the strip-shaped channel 24 is provided on the end section 211. A plurality of elastic ropes 212 are alternately distributed in the left-right direction and can correspond to the lower part of the mesh 50. After the plurality of elastic ropes 212 are provided between the transverse rods 21, an elastic buffer layer can be formed under the mesh 50, which can improve the elastic buffer performance of the fall alarm device on the one hand, and form a secondary protection structure on the other hand, and improve the fall prevention effect and safety.

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

[0049] The present invention also relates to a lifting platform, which comprises a pair of the above-mentioned fall alarm devices, and the two fall alarm devices are installed oppositely on the left and right below the lower end surface of the lifting platform body 10.

[0050] The slide seat 20 and the lifting platform body 10 are matched with each other through a slide rail structure arranged in the left and right directions, and the end longitudinal rods 22 on the two slide seats 20 are arranged opposite to each other left and right, and can maintain a state of being relatively located below the lower end surface of the lifting platform body 10, as shown in FIG. Figure 3 The free ends of the edge arms 25 on the two slide seats 20 can be kept in a state of being relatively located on the left side outside the left side surface or the right side outside the right side surface of the lifting platform body 10; wedge surface portions 15 can also be respectively provided on the left and right sides of the lower end surface of the lifting platform body 10, so that the edge arms 25 on both sides can be correspondingly retracted under the wedge surface portions 15 on the same side, so that the left end of the slider 20 arranged on the left side can be retracted into the inner side of the left side surface of the lifting platform body 10, and the right end of the slider 20 arranged on the right side can be retracted into the inner side of the right side surface of the lifting platform body 10, see Figure 1 .

[0051] A driving assembly matching the end longitudinal rod 22 on the slide 20 is fixedly provided below the lower end surface of the lifting platform body 10, so that the driving assembly can drive the slide 20 to slide back and forth relative to the lifting platform body 10. The slide 20 relatively located on the left side can extend to the left to the outside of the lifting platform body 10, so that its end section 211 extends to the outside of the left side of the lifting platform body 10, and the reeling part 26 arranged between the edge arms 25 on the left side is actuated, so that the mesh 50 is released from the reel and stretched to form a left side protective mesh structure; similarly, the slide 20 relatively located on the right side can extend to the right to the outside of the lifting platform body 10, so that its end section 211 extends to the outside of the right side of the lifting platform body 10, and the reeling part 26 arranged between the edge arms 25 on the right side is actuated, so that the mesh 50 is released from the reel and stretched to form a right side protective mesh structure. The driving assembly is a double-rod cylinder 40 (which may be a pneumatic double-rod cylinder, a hydraulic double-rod cylinder, or an electric double-rod cylinder), and the driving assembly can drive the slides 20 on the left and right sides to move synchronously, so that the mesh 50 on the two slides 20 are simultaneously unfolded to form a protective mesh structure, and are simultaneously rolled 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 on the assembly base plate 13.

[0052] The lower end surface of the lifting platform body 10 is provided with a downwardly extending edge plate 14 at the front and rear sides. The two ends of the supporting connecting rod 311 in the two detection parts 31 on the left and right sides are matched with the edge plates 14 on the front and rear sides respectively, so that the detection parts 31 are fixedly arranged on the left and right sides of the lifting platform body 10, and the sleeve 312 corresponds to the two edge plates 14 on the front and rear sides. Figures 1 to 4 , Figures 6 to 8As shown, a pair of end blocks 30 are fixedly provided between the left end and the right end of the two opposite edge plates 14 at the front and rear. In other words, an end block 30 is fixedly provided at the left end and the right end of the two opposite edge plates 14 at the front and rear. The front and rear ends of the detection part 31 on the left match with the pair of end blocks 30 on the left, and the front and rear ends of the detection part 31 on the right match with the pair of end blocks 30 on the right, that is, the two ends of the support connecting rod 311 on one detection part 31 pass through the strip groove 24 respectively and match with the front and rear end blocks 30 on the left, and the two ends of the support connecting rod 311 on the other detection part 31 pass through the strip groove 24 respectively and match with the front and rear end blocks 30 on the right. The sleeve 312 corresponds to the end sections 211 on the front and rear transverse rods 21. The outer end side of the slider 20 can slide between the two opposite end blocks 30 at the front and rear. Specifically, two clamping arms 32 facing each other are formed on the end block 30, so that the two transverse rods 21 (the upper end sections 211) on the slider 20 pass through the two clamping arms 32. The two clamping arms 32 can support the transverse rods 21, thereby weakening the adverse effects caused by the cantilever effect of the transverse rods 21 extending outward relative to the lifting platform body 10, helping to optimize the stress condition of the slide seat 20 when it plays an anti-falling role, and improving the safety and reliability of the anti-falling effect.

[0053] like Figures 1 to 8 As shown, a support plate 11 is provided on the lifting platform body 10 and on the left and right sides respectively, and a cavity 12 capable of accommodating the slide 20 is formed between the upper end surface of the support plate 11 and the lower end surface of the lifting platform body 10. A slide rail structure corresponding to the transverse rod 21 is formed on the support plate 11, so that the slide 20 can slide in the left and right directions relative to the support plate 11 and the lifting platform body 10. 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 20 relative to the lifting platform body 10 in the left and right directions, the end longitudinal rods 22 on the slide 20 can all remain in the state of being located 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 wall surfaces of the cavity 12. The two cylinder rod ends of the double-rod cylinder 40 are provided with a driving connecting rod 41, so that the end of the driving connecting rod 41 is extended into the cavity 12 and connected to the end longitudinal rod 22 on the slide 20.

[0054] By providing 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, the inner end of the slide 20 is supported, which can optimize the stress condition of the slide 20 (when relatively extending to the outside of the lift body 10), so that the fall alarm device can be stably and reliably maintained in an effective matching state with the lift body 10, and is not easily deformed and ineffective due to strong impact force. In particular, after the end block 30 and the clamp arm 32 are configured at the same time, the stress condition of the slider 20 can be further improved.

[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 mold cavity 12 is formed between the opposing surfaces of the support plate 11 and the lifting platform body 10. Figure 1 , Figure 4 , Figure 8 In the illustrated solution, two pallets 11 are configured, and the width direction of the two pallets 11 is along the left-right direction, and the length direction is along the front-back direction, and the length direction of the two pallets 11 is vertically extending through the length direction of the lifting platform body 10. In other embodiments, four pallets 11 may be configured, and the four pallets 11 are distributed at the four corners of the lifting platform body 10. Two slides 20 are respectively configured in the left cavity 12 and the right cavity 12, and the two slides 20 can respectively 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 present invention. The present invention can be improved in many aspects without violating the overall concept, and those familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by 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 seat (20) comprises two transverse rods (21) arranged opposite to each other in the front and rear directions, an end longitudinal rod (22) fixedly connected to one end of the two transverse rods (21), and a middle longitudinal rod (23) fixedly connected to the middle of the two transverse rods (21); at the other ends of the two transverse rods (21), a strip-shaped groove (24) extending in the left-right direction is formed, and at the other ends of the two transverse rods (21), an edge arm (25) extending obliquely upward is formed; The reeling part (26) comprises a reel and a driving mechanism; the two ends of the reel are respectively pivotally matched with the two edge arms (25), and the driving mechanism can drive the reel to rotate; The detection part (31) comprises a supporting connecting rod (311), a sleeve (312) sleeved on the supporting connecting rod (311), and a sensing unit; the two ends of the supporting connecting rod (311) correspondingly pass through two strip-shaped grooves (24) arranged on two transverse rods (21) opposite to each other in the front and rear, and are fixedly connected to the lifting platform body (10); a plurality of arc-shaped elastic arms (313) are distributed on the outer peripheral surface of the supporting connecting rod (311), and the outer protruding surface of the elastic arm (313) is tangentially contacted with the inner peripheral surface of the sleeve (312); a sensitive body (314) on the sensing unit is fixedly arranged on the inner concave surface of the elastic arm (313); an elastic filler (317) is filled in the sleeve (312), and the elastic filler (317) wraps the supporting connecting rod (311) and the elastic arm (313) inside it; The sensitive body (314) can generate a physical quantity change when the elastic arm (313) undergoes elastic deformation, so that the sensing unit can generate a sensing signal and send out an early warning signal; The mesh cloth (50) has one end fixed on the outer circumference of the sleeve (312) and the other end fixed on the outer circumference of the reel and wound on the reel; when the slide seat (20) slides in the left and right directions relative to the lifting platform body (10), the mesh cloth (50) can be switchedly wound on and released from the reel under the action of the driving mechanism.

2. The fall alarm device according to claim 1, characterized in that: The sensitive body (314) is a strain gauge; the strain gauges arranged 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 peripheral surface of the sleeve (312), and an elastic pad (316) is arranged in the arc-shaped groove (315); one end of the mesh cloth (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: A plurality of elastic ropes (212) are arranged between two front and rear opposite transverse rods (21) and on one end side of the transverse rod (21) where the edge arm (25) is arranged; the plurality of elastic ropes (212) are alternately distributed in the left-right direction and can correspond to the bottom of the mesh (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 supporting connecting rod (311), and the two elastic arms (313) are distributed on the half outer peripheral surface of the supporting connecting rod (311) in the direction opposite to the direction in which the mesh cloth (50) extends outward relative to the sleeve (312), and are arranged symmetrically up and down.

6. A lifting platform, characterized in that: The device comprises two fall alarm devices as claimed in any one of claims 1 to 4, and the two fall alarm devices are installed on the lower part of the lifting platform body (10) opposite to each other on the left and right sides; The slide seat (20) and the lifting platform body (10) are matched with each other through a slide rail structure arranged in the left-right direction; the end longitudinal rods (22) on the two slide seats (20) are arranged opposite to each other in the left-right direction and can maintain a state of being relatively located below the lower end surface of the lifting platform body (10); A driving assembly matching the end longitudinal rod (22) on the slide seat (20) is fixedly provided below the lower end surface of the lifting platform body (10), so that the driving assembly can drive the slide seat (20) to perform a reciprocating sliding motion relative to the lifting platform body (10).

7. The lifting platform according to claim 6, characterized in that: Wedge surface portions (15) are respectively formed on the left and right sides of the lower end surface of the lifting platform body (10), so that the edge arms (25) on the left and right sides can be correspondingly retracted under the wedge surface portions (15) on the same side.

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

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) arranged 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) arranged on the right side; Two clamping arms (32) facing each other up and down are formed on the end block (30), and the transverse rod (21) on the slide seat (20) can pass through between the two clamping arms (32) facing each other up and down.

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) and on the left and right sides respectively, and a cavity (12) capable of accommodating a slide seat (20) is formed between the upper end surface of the support plate (11) and the lower end surface 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); and the end longitudinal rod (22) on the slide seat (20) can maintain a state of being located in the cavity (12) and can contact the upper and lower wall surfaces of the cavity (12).

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