A platform lifting rod safety door

Abstract

The present invention provides a platform lifting rod safety door, which includes a plurality of single-body columns fixedly arranged on the platform at intervals along the length direction of the platform. The single-body column includes an active-side column and a driven-side column. Lifting power mechanisms and lifting mechanisms are provided on both the active-side column and the driven-side column. The lifting mechanism is slidably arranged on the lifting power mechanism, and the lifting power mechanism drives the lifting mechanism to move up and down. A lifting rod is provided on the lifting mechanism. The active-side column of one single-body column is connected to a motor that provides power for the lifting power mechanism. Among two adjacent single-body columns, the active-side column of one single-body column and the driven-side column of the other single-body column enclose a door opening through their respective lifting rods, and a power transmission component is connected between the active-side column and the driven-side column that enclose the door opening. The platform lifting rod safety door of the present invention realizes the safe hard isolation between the platform and the track, and effectively prevents the danger of children, passengers and luggage from falling into the track.

Description

Technical Field

[0001] The present invention belongs to the technical field of rail transit platforms, and particularly relates to a platform lifting rod safety door. Background Art

[0002] In recent years, with the large-scale construction of national railways, the railway transport capacity has been continuously increased, and the number of passengers sent at each station has reached new highs. In recent years, there have also been many major safety incidents such as passengers getting on the wrong platform, crossing the railway, climbing over the high platform, and stopping and delaying the departure of trains.

[0003] At home and abroad, subway platforms have been equipped with platform screen doors to enclose the train tracks, effectively avoiding the occurrence of accidents where passengers fall onto the platform. However, due to factors such as the designed load-bearing capacity of high-speed rail platforms, ultra-high column-free canopies, and the formation of wind tunnels when trains pass through, it is impossible to install platform screen doors. Therefore, the development of intelligent safety control on high-speed rail platforms has been relatively slow. Summary of the Invention

[0004] In view of the above technical problems, the present invention provides a platform lifting rod safety door, which realizes the safe hard isolation between the platform and the track, and effectively prevents the danger of children, passengers, and luggage from falling into the track.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A platform lifting rod safety door includes a plurality of single-body columns fixedly arranged on the platform at intervals along the length direction of the platform. The single-body columns include an active-side column and a driven-side column. An elevating power mechanism and an elevating mechanism are provided on both the active-side column and the driven-side column. The elevating mechanism is slidably arranged on the elevating power mechanism, and the elevating power mechanism drives the elevating mechanism to move up and down. A lifting rod is provided on the elevating mechanism. The active-side column is connected to a motor that provides power for the elevating power mechanism. Among two adjacent single-body columns, the active-side column in one single-body column and the driven-side column in the other single-body column enclose a door opening through their respective lifting rods. A power transmission component is connected between the active-side column and the driven-side column that enclose the door opening, and the power transmission component transmits the power from the motor to the elevating power mechanism on the active-side column to the elevating power mechanism on the driven-side column.

[0007] Furthermore, the lifting power mechanism includes a first lifting slide rail, a plurality of upper lifting power sprockets and a plurality of lower lifting power sprockets. The first lifting slide rails on the active side column and the driven side first lifting slide rail are arranged at intervals in mirror symmetry. The lower lifting power sprockets and the upper lifting power sprockets on the active side column and the driven side column are symmetrically arranged between the two first lifting slide rails on both sides. The lower lifting power sprockets on both sides are rotatably penetrated through the rotating shaft, and both ends of the rotating shaft are fixed on the lower fixing seat fixedly connected with the base. The upper lifting power sprockets on both sides are rotatably penetrated through the rotating shaft, and both ends of the rotating shaft are fixed on the upper fixing seat fixedly connected with the inner side wall of the upper part of the first lifting slide rail. Each upper lifting power sprocket and a lower lifting power sprocket are arranged vertically opposite to each other, and a first chain is engaged with the upper and lower lifting power sprockets arranged opposite to each other. The chain on the side of the first chain close to the first lifting slide rail is located inside the first lifting slide rail; the output shaft of the motor is rotationally connected with the lower lifting power sprocket; both ends of the power transmission component are fixedly connected with the adjacent sides of the two first chains arranged oppositely on both sides, and the lifting mechanism is fixedly connected with the first chain.

[0008] Furthermore, the cross-section of the first lifting slide rail is C-shaped, and slide ways for embedding and connecting with the lifting mechanism are arranged on the inner side walls of its three sides, and the lifting mechanism slides along the slide ways.

[0009] Furthermore, the power transmission component includes a regulator, a second chain, an active side pulling sprocket and a driven side pulling sprocket. The active side pulling sprocket and the driven side pulling sprocket are respectively penetrated through a rotating shaft and symmetrically arranged inside the lower part of the first lifting slide rails on the active side and the driven side, and are fixedly connected with the upper end surface of the base. Both ends of the rotating shaft are fixedly connected with the inner side wall of the first lifting slide rail; both ends of the regulator are connected with adjusting screws, and the other ends of the adjusting screws on both sides are respectively connected with one end of a power transmission chain. The power transmission chain close to the active side column is engaged with the lower side of the active side pulling sprocket and its other end is connected with the lower end of the active side floating column. The power transmission chain close to the driven side column is engaged with the lower side of the driven side pulling sprocket and its other end is connected with a plurality of first chains through a tension bracket.

[0010] Furthermore, the regulator, the two adjusting screws and the power transmission chain within the range of the door opening are enclosed in a groove body, and chain lubricating boxes are arranged on both sides inside the groove body.

[0011] Furthermore, the lifting mechanism includes a floating column. The cross-section of the floating column is C-shaped. The floating column is sleeved inside the first lifting slide rail, and its outer side wall slides on the slide way inside the first lifting slide rail; the floating column is connected with the first chain on the same side through a connecting piece, and a plurality of the lifting rods are vertically arranged at intervals from top to bottom on the floating column, and one end extends out from the open side of the floating column and the first lifting slide rail.

[0012] Furthermore, the lifting mechanism further includes a lifting component for the lifting rod, which includes a floating vertical upper sprocket, a floating vertical lower sprocket, and a lifting rod slide rail. The floating vertical upper sprocket and the floating vertical lower sprocket are rotatably arranged on two fixed shafts whose one ends are fixedly connected to the upper and lower parts of the inner side wall in the length direction of the floating vertical column. A floating chain is engaged with the floating vertical upper sprocket and the floating vertical lower sprocket; the lifting rod slide rail is fixed on the inner side wall in the length direction of the floating vertical column, and the lifting rod slide rail is located between the floating vertical upper sprocket and the floating vertical lower sprocket. The cross-section of the lifting rod slide rail is C-shaped, and the opening of the lifting rod slide rail faces the opening of the floating vertical column. The opening of the lifting rod slide rail is divided into multiple sub-slide rails with gradually increasing widths from top to bottom. One end of the lifting rod is connected to the horizontal part of a track slider with a ┌-shaped longitudinal section. On both sides of the vertical part of the track slider, pulleys are connected through rotating shafts vertically passing through it. The pulleys are embedded in the lifting rod slide rail and move up and down along the lifting rod slide rail. The widths of the horizontal parts of the track sliders on multiple lifting rods gradually increase from top to bottom. One track slider with a width adapted to each sub-slide rail is embedded; the lowermost lifting rod is fixedly connected to one side of the floating chain through a connecting piece. A cross-shaped block is fixed to the middle and lower part of the other side of the floating chain. The horizontal part of the cross-shaped block is perpendicular to the side wall in the length direction of the lifting rod slide rail. A fixed column vertically extending upward from the bottom plate of the base to the upper end of the first lifting slide rail is provided. The fixed column extends inside the floating vertical column and is located on the side where the cross-shaped block is provided. A cross-shaped block clamping seat for blocking the cross-shaped block is fixed to the upper end of the fixed column near the cross-shaped block.

[0013] Furthermore, the cross-shaped block clamping seat includes baffles symmetrically arranged at intervals and mirror-symmetric with respect to the fixed column. The length of the horizontal part of the cross-shaped block is greater than the distance between the two baffles. When the floating vertical column reaches the height where the cross-shaped block clamping seat is located, the floating chain on the same side is located between the two baffles.

[0014] Furthermore, an inward-extending notch is provided at the free end of the horizontal part of the track slider, and a fixed shaft vertically passing through the notch is provided thereon. One end of the lifting rod is rotatably connected to the fixed shaft.

[0015] Furthermore, a fixed lifting rod is fixedly provided at the upper end of the floating vertical column; a counterweight block is fixed to each chain of the first chain on the side away from the first lifting slide rail.

[0016] The working principle of the platform lifting rod safety door of the present invention is that when the motor on the active side runs and rotates, it drives the rotation of the closed-loop chain drive device composed of the upper sprocket on the active side and the lower sprocket on the active side. This chain group drives the upward movement of the floating column on the active side, and the floating column on the active side drives the upward movement of the hanging chain below. This pulling force transmits the pulling force to the driven side of another single column through the driving side chain pulley. The driven chain pulley converts the horizontal pulling force of the chain into a vertical pulling force to make the pulling force bracket move downward, and conducts the force to the closed-loop chain drive device composed of the upper sprocket on the driven side and the lower sprocket on the driven side, pulling the floating column on the driven side to move upward; when the floating column moves upward, it will drive the internal mechanism and the cross block to move upward together. The cross block seat is connected to the fixed column and thus remains stationary. When the floating column rises to a certain height, the cross block seat will block the cross block. At this time, when the floating column continues to move upward, due to the cross block being blocked, it will pull the floating chain to rotate, and then pull the track slider at the bottom upward. When the track slider at the bottom contacts the track slider above it, it will push it to rise together, and then when it contacts the next track slider, it will push it to rise together until it reaches the highest point; since the lifting rod slide rail has different widths of gaps at different strokes, this width can control the passing ability of the track slider. Since the widths of the track sliders from bottom to top increase in turn, when the floating column descends, it will drive multiple track sliders to descend together. When the top track slider reaches the first narrowing opening, the track slider below it can continue to descend through. The width of the top track slider is greater than the narrowing opening and will be positioned at the first narrowing opening. When reaching the second narrowing opening, the second track slider from top to bottom will be restricted at the second narrowing opening, and the track slider below it can continue to descend through until all track sliders stop descending; the open design of the lifting rod track realizes the function of the interval distribution of the railing part; the counterweight is used to balance part of the weight of the floating column, which can reduce the force applied during driving operation, thereby reducing the power of the driving equipment; by setting a regulator and an adjusting screw, when the heights of the floating columns on both sides are inconsistent, by adjusting the screwed length of the adjusting screw, the heights of the floating columns on both sides can be made consistent.

[0017] A radar is installed on the platform. When it senses that the train has stopped, it sends a signal to the PLC. The PLC issues an instruction to the motor on the equipment. The motor runs to pull the chain and lift the rod to the top to allow passengers to pass. After the train departs, the radar sends a signal to the PLC, and the PLC issues an instruction to the motor, and the motor moves to lower the rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the front view of the platform lifting rod safety door in the open state according to the present invention;

[0019] Figure 2 is the rear view of the platform lifting rod safety door in the open state according to the present invention;

[0020] Figure 3 It is a diagram showing the positional relationship between the driven-side column and the first chain of the present invention;

[0021] Figure 4 It is a schematic internal structure diagram of the driven-side column when the platform lifting rod safety door of the present invention is in the open state;

[0022] Figure 5 It is a schematic internal structure diagram of the driven-side column when the platform lifting rod safety door of the present invention is in the closed state;

[0023] Figure 6 It is a schematic structural diagram of the lifting rod slide rail of the present invention;

[0024] Figure 7 It is a schematic connection diagram of the lifting rod slide rail and the track slider of the present invention.

[0025] Among them, 1 - active-side column, 2 - driven-side column, 5 - motor, 6 - lifting rod, 31 - first lifting slide rail, 32 - upper sprocket for lifting power, 33 - lower sprocket for lifting power, 34 - first chain, 41 - floating column, 71 - upper sprocket for floating column, 72 - lower sprocket for floating column, 73 - lifting rod slide rail, 74 - floating chain, 75 - track slider, 76 - cross-block seat, 77 - cross-block, 78 - pulley, 761 - baffle, 81 - regulator, 82 - power transmission chain, 83 - active-side pulling sprocket, 84 - driven-side pulling sprocket, 85 - adjusting screw, 86 - groove body, 87 - chain lubricating box, 88 - tension bracket, 9 - base, 10 - lower fixing seat, 11 - upper fixing seat, 12 - counterweight, 13 - fixed lifting rod, 14 - connecting piece, 15 - fixed column. Specific embodiments

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] As Figures 1-7As shown in the figure, a platform lifting rod safety door includes a plurality of single columns fixedly arranged on the platform at intervals along the length direction of the platform. The single column includes an active side column 1 and a driven side column 2. Lifting power mechanisms and lifting mechanisms are provided on both the active side column 1 and the driven side column 2. The lifting mechanism is slidably arranged on the lifting power mechanism, and the lifting power mechanism drives the lifting mechanism to move up and down. A lifting rod 6 is provided on the lifting mechanism. The active side column 1 is connected to a motor 5 that provides power for the lifting power mechanism. Among two adjacent single columns, the active side column 1 in one single column and the driven side column 2 in the other single column enclose a door opening through their respective lifting rods 6. A power transmission component is connected between the active side column 1 and the driven side column 2 that enclose a door opening. The power transmission component transmits the power of the motor 5 transmitted to the lifting power mechanism on the active side column 1 to the lifting power mechanism of the driven side column 2.

[0028] The lifting power mechanism includes a first lifting slide rail 31, two upper lifting power sprockets 32 and two lower lifting power sprockets 33. The first lifting slide rail 31 on the active side column 1 and the first lifting slide rail 31 on the driven side are arranged at intervals in mirror symmetry. The lower lifting power sprockets 33 and the upper lifting power sprockets 32 on the active side column 1 and the driven side column 2 are symmetrically arranged between the two first lifting slide rails 31 on both sides. The lower lifting power sprockets 33 on both sides are rotatably arranged on a rotating shaft, and both ends of the rotating shaft are fixed to a lower fixing seat 10 fixedly connected to a base 9. The upper lifting power sprockets 32 on both sides are rotatably arranged on a rotating shaft, and both ends of the rotating shaft are fixed to an upper fixing seat 11 fixedly connected to the inner side wall of the upper part of the first lifting slide rail 31. Each upper lifting power sprocket 32 and a lower lifting power sprocket 33 are arranged vertically opposite to each other. A first chain 34 is engaged with the upper and lower lifting power sprockets 32 and 33 arranged opposite to each other. The chain on the side of the first chain 34 close to the first lifting slide rail 31 is located inside the first lifting slide rail. The output shaft of the motor 5 is rotationally connected to the lower lifting power sprocket 33.

[0029] The cross-section of the first lifting slide rail 31 is C-shaped, and sliding grooves for embedding and connecting with the lifting mechanism are provided on the inner side walls of its three sides. The lifting mechanism includes a floating column 41. The cross-section of the floating column 41 is C-shaped. The floating column 41 is sleeved inside the first lifting slide rail 31, and its outer side wall is slidably connected to the sliding groove inside the first lifting slide rail 31. The floating column 41 is connected to the first chain 34 on the same side through a connecting piece. A plurality of the lifting rods 6 are vertically arranged at intervals from top to bottom on the floating column 41, and one end extends out from the open side of the floating column 41 and the first lifting slide rail 31.

[0030] The power transmission assembly includes a regulator 81, a power transmission chain 82, a driving-side traction sprocket 83, and a driven-side traction sprocket 84. The driving-side traction sprocket 83 and the driven-side traction sprocket 84 are respectively sleeved with a rotating shaft and symmetrically arranged at the lower part inside the first lifting slide rail 31 on the driving side and the driven side, and are fixedly connected to the upper end surface of the base 9. Both ends of the rotating shaft are fixedly connected to the inner side wall of the first lifting slide rail 31; both ends of the regulator 81 are connected with adjusting screws 85, and the other ends of the adjusting screws 85 on both sides are respectively connected to one end of a power transmission chain 82. The power transmission chain 82 near the driving-side column 1 is tooth-connected to the lower side of the driving-side traction sprocket 83, and its other end is connected to the lower end of the floating column 41 on the driving side. The power transmission chain 82 near the driven-side column 2 is tooth-connected to the lower side of the driven-side traction sprocket 84, and its other end is connected to the first chain through a tension bracket 88; the regulator 81, the two adjusting screws 85, and the power transmission chain 86 within the range of the door opening are enclosed in a trough 86, and chain lubrication boxes 87 are provided on both sides inside the trough 86.

[0031] The lifting mechanism further includes a lifting rod lifting assembly. The lifting rod lifting assembly includes a floating column upper sprocket 71, a floating column lower sprocket 72, and a lifting rod slide rail 73. The floating column upper sprocket 71 and the floating column lower sprocket 72 are rotatably arranged on two fixed shafts whose one ends are fixedly connected to the upper and lower parts of the inner side wall in the length direction of the floating column 41. A floating chain 74 is tooth-connected to the floating column upper sprocket 71 and the floating column lower sprocket 72; the lifting rod slide rail 73 is fixed to the inner side wall in the length direction of the floating column 41. The lifting rod slide rail 73 is located between the floating column upper sprocket 71 and the floating column lower sprocket 72. The cross section of the lifting rod slide rail 73 is C-shaped, and the opening of the lifting rod slide rail 73 faces the opening of the floating column 41. The opening of the lifting rod slide rail 73 is divided into multiple sub-slide rails with gradually increasing widths from top to bottom. One end of the lifting rod 6 is connected to the horizontal part of an L-shaped track slider 75. On both sides of the vertical part of the track slider 75, pulleys 78 are connected through rotating shafts vertically penetrating it. The pulleys 78 are embedded in the lifting rod slide rail 73 and move up and down along the lifting rod slide rail 73. The widths of the horizontal parts of the track sliders 75 on multiple lifting rods 6 gradually increase from top to bottom, and one width-matching track slider 75 is embedded in each sub-slide rail; the lowermost lifting rod 6 is fixedly connected to one side of the floating chain 74 through a connecting piece 14. A cross block 77 is fixed to the middle and lower part of the other side of the floating chain 74. The horizontal part of the cross block 77 is perpendicular to the side wall in the length direction of the lifting rod slide rail 73. A fixed column 15 vertically extending upward from the bottom plate of the base 9 to the upper end of the first lifting slide rail 31 is provided. The fixed column 15 extends inside the floating column 41. The fixed column 15 is located on the side where the cross block 77 is provided. A cross block seat 76 for blocking the cross block 77 is fixed to the upper end of the fixed column 15 near the cross block 77.

[0032] The cross-block seat 76 includes baffles 761 that are symmetrically spaced apart in a mirror image with respect to the relatively fixed upright post 15. The length of the transverse portion of the cross-block 77 is greater than the distance between the two baffles 761. When the floating upright post 41 reaches the height where the cross-block seat 76 is located, the floating chain 74 on the same side is located between the two baffles 761. An inwardly extending notch is provided at the free end of the transverse portion of the track slider 75, and a fixed shaft vertically penetrating the notch is provided thereon. One end of the lifting rod 6 is rotatably connected to the fixed shaft.

[0033] A fixed lifting rod 13 is fixedly provided at the upper end of the floating upright post 41; a counterweight 12 is fixed on each chain of the first chain 34 on the side away from the first lifting slide rail 31.

[0034] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those of ordinary skill in the art, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention shall be regarded as the protection scope of the present invention.

Claims

1. A platform lifting rod safety door, characterized in that, it includes a plurality of single columns fixedly arranged on the platform at intervals along the length direction of the platform. The single columns include a driving side column and a driven side column. Lifting power mechanisms and lifting mechanisms are provided on both the driving side column and the driven side column. The lifting mechanism is slidably arranged on the lifting power mechanism, and the lifting power mechanism drives the lifting mechanism to move up and down. A lifting rod is provided on the lifting mechanism. The driving side column is connected to a motor that provides power for the lifting power mechanism. Among two adjacent single columns, the driving side column in one single column and the driven side column in the other single column enclose a door opening through their respective lifting rods. A power transmission component is connected between the driving side column and the driven side column that enclose a door opening, and the power transmission component transmits the power of the motor transmitted to the lifting power mechanism on the driving side column to the lifting power mechanism on the driven side column; the lifting mechanism further includes a lifting rod lifting component, and the lifting rod lifting component includes a floating column upper sprocket, a floating column lower sprocket and a lifting rod slide rail. The floating column upper sprocket and the floating column lower sprocket are rotatably arranged on two fixed shafts whose one ends are fixedly connected to the upper and lower parts of the inner side wall of the floating column in the length direction. A floating chain is engaged with the floating column upper sprocket and the floating column lower sprocket; the lifting rod slide rail is fixed on the inner side wall of the floating column in the length direction, and the lifting rod slide rail is located between the floating column upper sprocket and the floating column lower sprocket. The cross section of the lifting rod slide rail is C-shaped, and the opening of the lifting rod slide rail faces the opening of the floating column. The opening of the lifting rod slide rail is divided into multiple sub-slide rails with gradually increasing widths from top to bottom. One end of the lifting rod is connected to the transverse part of a track slider with a ┌-shaped longitudinal section. Pulleys are connected to both sides of the vertical part of the track slider through rotating shafts vertically penetrating it, and the pulleys are embedded in the lifting rod slide rail and move up and down along the lifting rod slide rail. The widths of the transverse parts of the track sliders on multiple lifting rods gradually increase from top to bottom, and one width-matching track slider is embedded on each sub-slide rail; the lowermost lifting rod is fixedly connected to one side of the floating chain through a connecting piece. A cross block is fixed at the middle and lower part of the other side of the floating chain. The transverse part of the cross block is perpendicular to the side wall of the lifting rod slide rail in the length direction. A fixed column vertically extending upward from the bottom plate of the base to the upper end of the first lifting slide rail is provided, and the fixed column extends inside the floating column. The fixed column is located on the side where the cross block is provided. A cross block clamping seat for blocking the cross block is fixed on the upper end of the fixed column near the cross block.

2. The platform lifting rod safety door according to claim 1, characterized in that, The lifting power mechanism includes a first lifting slide rail, a plurality of upper lifting power sprockets and a plurality of lower lifting power sprockets. The first lifting slide rails on the active side column and the first lifting slide rail on the driven side are arranged at intervals in mirror symmetry. The lower lifting power sprockets and the upper lifting power sprockets on the active side column and the driven side column are symmetrically arranged between the two first lifting slide rails on both sides. The lower lifting power sprockets on both sides are rotatably arranged on the rotating shaft, and both ends of the rotating shaft are fixed on the lower fixing seat fixedly connected to the base. The upper lifting power sprockets on both sides are rotatably arranged on the rotating shaft, and both ends of the rotating shaft are fixed on the upper fixing seat fixedly connected to the inner side wall of the upper part of the first lifting slide rail. Each upper lifting power sprocket and a lower lifting power sprocket are arranged vertically opposite to each other, and a first chain is engaged with the upper and lower lifting power sprockets arranged opposite to each other. The chain on the side of the first chain close to the first lifting slide rail is located inside the first lifting slide rail; the output shaft of the motor is rotationally connected to the lower lifting power sprocket; both ends of the power transmission component are respectively fixedly connected to the adjacent sides of the two first chains arranged opposite to each other on both sides, and the lifting mechanism is fixedly connected to the first chain.

3. A platform lifting rod safety door according to claim 2, characterized in that the cross-section of the first lifting slide rail is C-shaped, and slideways for embedding and connecting with the lifting mechanism are provided on the inner side walls of its three sides, and the lifting mechanism slides along the slideways.

4. A platform lifting rod safety door according to claim 3, characterized in that the power transmission component includes a regulator, a second chain, an active side pulling sprocket and a driven side pulling sprocket. The active side pulling sprocket and the driven side pulling sprocket are respectively arranged inside the lower part of the first lifting slide rails on the active side and the driven side after passing through a rotating shaft, and are fixedly connected to the upper end surface of the base. Both ends of the rotating shaft are fixedly connected to the inner side wall of the first lifting slide rail; both ends of the regulator are connected with adjusting screws, and the other ends of the adjusting screws on both sides are respectively connected to one end of a power transmission chain. The power transmission chain close to the active side column is engaged with the lower side of the active side pulling sprocket and its other end is connected to the lower end of the active side floating column. The power transmission chain close to the driven side column is engaged with the lower side of the driven side pulling sprocket and its other end is connected to a plurality of first chains through a tension bracket.

5. A platform lifting rod safety door according to claim 4, characterized in that the regulator, the two adjusting screws and the power transmission chain within the range of the door opening are enclosed in a groove body, and chain lubricating boxes are provided on both sides inside the groove body.

6. A platform lifting rod safety door according to claim 4, characterized in that the lifting mechanism includes a floating column. The cross-section of the floating column is C-shaped. The floating column is sleeved inside the first lifting slide rail, and its outer side wall is slidably connected with the slideway inside the first lifting slide rail; the floating column is connected to the first chain on the same side through a connecting piece, and a plurality of the lifting rods are vertically arranged at intervals from top to bottom on the floating column, and one end extends out from the open side of the floating column and the first lifting slide rail.

7. A platform lifting rod safety door according to claim 6, characterized in that The cross-block seat includes baffles that are symmetrically spaced apart and mirror-symmetrical with respect to the relative fixed columns. The length of the transverse portion of the cross-block is greater than the distance between the two baffles. When the floating column reaches the height where the cross-block seat is located, the floating chain on the same side is located between the two baffles.

8. A platform lifting rod safety door according to claim 7, characterized in that a notch extending inward is provided at the free end of the transverse portion of the rail slider, and a fixed shaft vertically penetrating the notch is provided thereon, and one end of the lifting rod is rotatably connected to the fixed shaft.

9. A platform lifting rod safety door according to claim 1, characterized in that a fixed lifting rod is fixedly provided at the upper end of the floating column; a counterweight block is fixedly provided on each chain of the first chain on the side away from the first lifting slide rail.

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