Telescopic platform mechanism for trestle

Abstract

The invention discloses a telescopic platform mechanism for a trestle, and belongs to the field of aviation technological equipment. Comprising a foundation frame, a fixed platform, a telescopic platform and a transmission mechanism, the telescopic platform is telescopic through a transmission mechanism. According to the telescopic platform mechanism for the trestle bridge, the outer edge of the telescopic platform can be attached to the outer edge of an airplane as much as possible, and safety accidents caused by the fact that workers step missed accidentally in the operation process are prevented. Controllable stretching and retracting are achieved, self-locking at any position is achieved, and operation of workers is safe and convenient.

Description

Technical Field

[0001] The invention belongs to the field of aviation process equipment, and discloses a telescopic platform mechanism for a trestle bridge. Background Art

[0002] During the aircraft assembly process, assembly tooling and underframe tooling are required to implement the process from parts to components. Such tooling is relatively tall, which requires corresponding trestle bridges and working ladders to be matched. Workers stand on the platforms of the trestle bridges and working ladders to complete the assembly and riveting of products. Requirements for the trestle bridge platform:

[0003] 1. Only when working on the platform: It is required that the outer edge of the platform should fit the outer edge of the aircraft as much as possible to prevent workers from accidentally stepping into the air and causing safety accidents during operation.

[0004] 2. When working on and under the platform simultaneously: It is necessary to ensure that workers on the platform do not step into the air, and at the same time, it is necessary to ensure that the platform does not interfere with people when working under the platform.

[0005] To meet the above two requirements, conventional trestle bridges and working ladders mostly adopt the structure of adding a flap to the outer edge of the platform.

[0006] However, there are several problems with such a structure in use:

[0007] 1. Since the current method of taking the assembled tooling product off the shelf is mainly side-out, the trestle bridge and working ladder are required to be movable; when the movable trestle bridge and working ladder move to the assembly tooling station, their positions are not necessarily accurate, and the flipping size of the flap is fixed. To ensure that the product is not scratched, the gap between the flap and the aircraft product is relatively large. Therefore, the flap structure is suitable for fixed trestle bridges and working ladders.

[0008] 2. The flap structure is connected to the outer edge of the platform by hinges. Considering strength and operation convenience, the flap is not easy to be too long and too wide.

[0009] 3. There is no guardrail on the side of the flap, and there is a risk of stepping into the air when manually flipping the flap.

[0010] In view of the above problems, it is necessary to study a telescopic platform mechanism that can achieve controllable telescoping, self-locking at any position, and safe and convenient operation for workers, and is used in conjunction with movable trestle bridges and working ladders to realize the assembly process of aircraft products. Summary of the Invention

[0011] To solve the above problems, the invention provides a telescopic platform mechanism for a trestle bridge, which is applied to the trestle bridge step mechanism required for high-altitude operation during the aircraft assembly process, and can achieve controllable telescoping, reliable self-locking, and conforming to the theoretical outer edge of the aircraft.

[0012] According to one aspect of the present application, a telescopic platform mechanism for a trestle is provided. The telescopic platform mechanism includes a base frame 100, a fixed platform 200, a telescopic platform 300, and a transmission mechanism 400;

[0013] The base frame 100 and the fixed platform 200 are bolted together;

[0014] The base frame 100 and the telescopic platform 300 are bolted together;

[0015] The fixed platform 200 and the transmission mechanism 400 are bolted together;

[0016] The telescopic platform 300 and the transmission mechanism 400 are bolted together;

[0017] The telescopic platform 300 is telescoped through the transmission mechanism 400.

[0018] The base frame 100 is welded by a cross beam 101, a transition beam 102, longitudinal beams 103, intermediate beams 104, pads 105, connecting plates 106, connecting plates 107, and closing plates 108;

[0019] The fixed platform 200 consists of side guides 201, intermediate guides 202, deck plates 203, slow boards 204, stiffeners 205, limit blocks 206, transition connecting plates 207, screws 208, nuts 209, screws 210, screws 211, screws 212, spring washers 213, nuts 214, bolts 215, spring washers 216, screws 217, and dust covers 218;

[0020] The telescopic platform 300 consists of a frame 301, deck plates 302, toothed plates 303, pressing plates 304, bearings 305, screws 306, spring washers 307, screws 308, spring washers 309, countersunk head screws 310, screws 311, spring washers 312, and cylindrical pins 313;

[0021] The transmission mechanism 400 consists of a driving wheel 401, a driven wheel 402, a driving wheel bracket 403, a left driven wheel bracket 404, a right driven wheel bracket 405, a bearing seat 406, a protective cover 407, a shaft 408, a handle 409, a speed reducer 410, a coupling 411, and a synchronous belt 412.

[0022] Twelve M6 threaded holes are machined on the upper plane of the transition beam 102 for connecting the deck plate 203;

[0023] Twelve Φ11mm through holes are machined on the side surface of the transition beam 102 for connecting the transition connecting plate 207 in the fixed platform 200;

[0024] Seven M8 threaded holes are machined on the upper plane of the longitudinal beam 103 for connecting the side guide 201;

[0025] There are 14 M8 threaded holes on the upper plane of the middle beam 104 for connecting the middle guide rail 202;

[0026] There are 8 M10 threaded holes on the connecting plate 106 and 4 M10 threaded holes on the connecting plate 107.

[0027] The side guide rail 201 has a C-shaped structure;

[0028] There are 7 Φ8.5mm counterbore holes on the lower plane of the side guide rail 201, and 7 Φ15mm through holes are correspondingly made on the upper plane. The screw 217 passes through the Φ15mm hole and is installed into the Φ8.5mm counterbore hole and then screwed to the foundation frame 100;

[0029] There is 1 Φ6.5mm counterbore hole on the lower plane of the side guide rail 201. The limit block 206 is screwed to the side guide rail 201 through the screw 208 and the nut 209;

[0030] There are 5 M6 threaded holes on the upper plane of the side guide rail 201. The deck plate 203 is screwed to the side guide rail 201 through the screw 210;

[0031] There are 4 M6 threaded holes on the side surface of the side guide rail 201. The transition connecting plate 207 is screwed to the side guide rail 201 through the screw 212 and the spring washer 213;

[0032] The middle guide rail 202 has an I-shaped structure, which is equivalent to two side guide rails 201 arranged opposite to each other on the sides, and the assembly form is the same as that of the side guide rail 201;

[0033] There are 18 Φ6.5mm counterbore holes on the four sides of the front surface of the deck plate 203. Among them, 4 at the upper end are used for screwing to the transition beam 102, 4 at the lower end are used for screwing to the slow step plate 204, and 5 on each of the left and right sides are used for screwing to the side guide rail 201 and the middle guide rail 202;

[0034] There are 10 Φ4.2mm counterbore holes in the middle part of the front surface of the deck plate 203. The reinforcing rib 205 is screwed to the deck plate 203 through the screw 211;

[0035] There is 1 lock hole at the upper end of the deck plate 203 for the passage of the handle 409 during manual transmission and the installation of the dust cover 218 during rest; The slow step plate 204 is used for workers to walk slowly and prevent knocking when walking from the fixed platform 200 to the telescopic platform 300. The slow step plate 204 has 4 M6 threaded holes for connecting to the deck plate 203;

[0036] The reinforcing rib 205 has 10 M4 threaded holes for connecting to the deck plate 203 to increase the strength of the deck plate 203;

[0037] The limit block 206 is provided with an oblong hole for preventing the nut 209 from rotating;

[0038] The transition connecting plate 207 is provided with 4 Φ6.5mm through holes for connecting to the side guide rail 201 and the middle guide rail 202;

[0039] The transition connecting plate 207 is provided with 4 Φ10.5mm through holes and is connected to the transition beam 102 through nuts 214, bolts 215, and spring washers 216;

[0040] The dust cover 218 is composed of an end cover 2181, a screw rod 2182, a cotton cord 2183, and a nut 2184;

[0041] The cotton cord 2183 is fastened in the radial hole of the screw rod 2182;

[0042] The screw rod 2182 passes through the end cover 2181 and is fixed with a nut 2184.

[0043] The frame 301 is welded by a bottom cross beam 3011, a middle cross beam 3012, a middle longitudinal beam 3013, side plates 3014, a first reinforcing plate 3015, a second reinforcing plate 3016, and a third reinforcing plate 3017;

[0044] The middle cross beam 3012 is provided with 12 M6 threaded holes for connecting the floor plate 302;

[0045] The side plate 3014 is provided with 8 M10 threaded holes and 4 Φ6mm pin holes, and is connected to the bearing 305 through screws 311, spring washers 312, and cylindrical pins 313;

[0046] The third reinforcing plate 3017 is provided with 4 M6 threaded holes for connecting the pressing plate 304;

[0047] The floor plate 302 is provided with 12 Φ6.5mm counterbored holes and is connected to the frame 301 through countersunk head screws 310;

[0048] The toothed plate 303 has a toothed structure, and the shape of the toothed structure is machined according to the tooth profile of the synchronous belt 412;

[0049] The toothed plate 303 is provided with 6 Φ5.5mm through holes, and the toothed belt is connected to the pressing plate 304 through screws 306 and spring washers 307;

[0050] The pressing plate 304 is provided with 4 Φ6mm counterbored holes and is connected to the third reinforcing plate 3017 through screws 308 and spring washers 309;

[0051] The pressing plate 304 is provided with 4 M5 threaded holes for connecting the toothed plate 303;

[0052] Four sets of the bearings 305 are provided. The four sets of bearings 305 are installed in the side guide rails 201 and the middle guide rail 202 to drive the overall telescopic platform 300, so as to realize the telescopic guidance of the telescopic platform 300.

[0053] The driving wheel 401 is composed of a belt pulley 4011, a bearing seat 4012, a perforated end cover 4013, an end cover 4014, a shaft 4015, bearings 4016, a retaining ring 4017, a flat key 4018, and a flat key 4019;

[0054] The belt pulley 4011 is designed according to the synchronous belt 412. The two sides of the teeth of the belt pulley 4011 are provided with shoulders, and the two end faces are provided with bosses for limiting the inner ring of the bearing 4016. The middle hole is provided with a keyway and is positioned and connected to the shaft 4015 through the flat key 4018;

[0055] A rectangular groove is made on the left side of the bearing seat 4012 for the belt pulley 4011 to drive the outlet of the synchronous belt 412;

[0056] Bearing holes are made on the front and rear surfaces of the bearing seat 4012 for installing the bearings 4016, and end cover holes are made for installing the end cover 4014;

[0057] Threaded holes are made on the bearing seat 4012 for connecting the end cover 4014;

[0058] Four M10 threaded holes are made on the right side of the bearing seat 4012 for connecting to the driving wheel bracket 403;

[0059] Two M6 threaded holes are made on the bottom surface of the bearing seat 4012 for connecting the protective cover 407;

[0060] The shaft 4015 consists of two ends with different diameters;

[0061] The shaft end of the bearing seat 4012 is provided with a shoulder for limiting the inner ring of the bearing 4016. The bearings 4016, the belt pulley 4011, the bearings 4016, and the perforated end cover 4013 are inserted in sequence and the inner ring of the bearing 4016 is limited by the retaining ring 4017. A flat key 4018 is made on the smaller diameter section of the shaft 4015 and inserted into the coupling 411;

[0062] The driven wheel 402 is composed of a belt pulley 4021, a bearing seat 4022, an end cover 4023, a shaft 4024, bearings 4025, a retaining ring 4026, a flat key 4027, and a screw 4028;

[0063] The belt pulley 4021 is designed according to the synchronous belt 412. The two sides of the teeth of the belt pulley 4021 are provided with shoulders, and the two end faces are provided with bosses for limiting the inner ring of the bearing 4025. The middle hole is provided with a keyway and is positioned and connected to the shaft 4024 through the flat key 4027;

[0064] A rectangular hole is made on the left side of the bearing seat 4022 for the pulley 4021 to drive the outlet of the synchronous belt 412;

[0065] Bearing holes are made on the front and rear surfaces of the bearing seat 4022 for installing the bearing 4025, and end cover holes are made for installing the end cover 4023;

[0066] Threaded holes are made on the bearing seat 4022, and the end cover 4023 is connected by screws;

[0067] 4 M10 threaded holes are made on the right side of the bearing seat 4022 for connecting to the left driven wheel bracket 404 and the right driven wheel bracket 405;

[0068] 2 M6 threaded holes are made on the bottom surface of the bearing seat 4022 for connecting the protective cover 407;

[0069] Grooves are made at both ends of the shaft 4024 for installing snap rings 4026 to limit the inner ring of the bearing 4025;

[0070] The driving wheel bracket 403 is made with 4 Φ11mm through holes for connecting the driving wheel 401;

[0071] The driving wheel 403 is made with 4 Φ8.5mm counterbore holes for connecting to the transition connecting plate 207;

[0072] 4 Φ11mm through holes are made on the vertical surface of the left driven wheel bracket 404 for connecting to the basic frame 100;

[0073] 4 Φ11mm through holes are made on the bottom surface of the left driven wheel bracket 404 for connecting the driven wheel 402;

[0074] The right driven wheel bracket 405 is symmetrical to the left driven wheel bracket 404, and has the same structural function;

[0075] The bearing seat 406 is composed of a bushing 4061, a shaft 4062, a nut 4063, and a bearing 4064;

[0076] Bearing holes are made on the ear seats of the bushing 4061 for limiting the outer ring of the bearing 4064;

[0077] 8 Φ8.5mm through holes are made on the vertical surface of the ear seats of the bushing 4061, 4 on the upper part for connecting to the transition connecting plate 207, and 4 on the lower part for connecting to the reducer 410;

[0078] A shoulder is provided at the upper end of the shaft 4062 for limiting the inner ring of the bearing;

[0079] Threads are made at the lower end of the shaft 4062. After passing through the ear seat, it is tightened with a nut 4063 and is also used to limit the inner ring of the bearing 4064;

[0080] The upper end of the shaft 4062 is made into an internal spline to cooperate with the handle 409 for transmission input, and cooperate with the dust cover 218 for dust prevention when stationary;

[0081] The lower end of the shaft 4062 is provided with a hole with a keyway connected to the input shaft of the reducer 410;

[0082] The bearing seat 406 is connected to the transition connecting plate 207 through 8 M10 threaded holes formed on the connecting plate 106 and 4 M10 threaded holes formed on the connecting plate 107;

[0083] The protective cover 407 has a U-shaped structure, and oblong holes are made at both ends for connecting to the driving wheel 401 and the driven wheel 402, and is used to prevent workers from pinching their hands when the synchronous belt 412 is driving;

[0084] The shaft 408 has keyways in the middle and at both ends, the middle section is inserted into the output hole of the reducer 410, and the two ends are respectively inserted into the coupling 411, so that the two sets of synchronous belts are synchronously driven;

[0085] The handle 409 is composed of a fork-shaped piece 4091, a round tube 4092, a spline shaft 4093, and a handle 4094;

[0086] The fork-shaped member 4091, the round tube 4092, and the spline shaft 4093 are connected by welding, and the two handles 4094 are screwed on the fork-shaped member 4091;

[0087] The spline shaft 4093 is made into a spline and cooperates with the shaft 4062 for transmission input;

[0088] The end cover 2181 is provided with a spline for connecting with the spline shaft 4093 .

[0089] The floor plate 203 is a patterned aluminum plate.

[0090] The protective cover 407 is a sheet metal part.

[0091] According to another aspect of the present application, a pier is provided, which has the above-mentioned telescopic platform mechanism for the pier.

[0092] According to another aspect of the present application, there is provided a method for using the above-mentioned trestle. Move the trestle to a designated position, at this time the telescopic platform 300 is in a contracted state; open the dust cover 218, turn the insertion shaft 4062 with the handle 409 and turn it, driving the reduction gear 410 to rotate; reverse the output at both ends through the shaft 408 to synchronize to the driving wheel 401, and cooperate with the driven wheel 402 to drive the synchronous belt 412 to move; drive the entire telescopic platform 300 to extend to the target position in the side guide rail 201 and the middle guide rail 202 grooves of the fixed platform 200 through the toothed plate 303 and the pressing plate 304 connected to the synchronous belt; after the work is completed, reverse the shaft 4062 with the handle 409 to contract the telescopic platform 300 back to the starting position, and retreat the trestle to the storage place to make room for the product to be taken off the shelf.

[0093] Compared with the prior art, the present application has the following advantages:

[0094] The telescopic platform mechanism of the trestle described in the present application can make the outer edge of the telescopic platform fit the outer edge of the aircraft as much as possible to prevent workers from accidentally stepping into the air and causing safety accidents during operation. It realizes controllable telescoping, self-locking at any position, and makes the operation of workers safe and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] Figure 1 It is a top view of the telescopic platform mechanism for the trestle, where a is the extended state and b is the contracted state;

[0096] Figure 2 It is a bottom view of the telescopic platform mechanism for the trestle, where a is the extended state and b is the contracted state;

[0097] Figure 3 It is the basic frame 100, where a is the bottom view, b is the side view, and c is the top view;

[0098] Figure 4 It is the fixed platform 200, where a is the top view, b is the side view, c is the bottom view, and d is the sectional view of a specific area in a;

[0099] Figure 5 It is the side guide rail 201, where a and b are the side views, c is the front view, and d is the top view;

[0100] Figure 6 It is the middle guide rail 202, where a and b are the side views, c is the front view, and d is the top view;

[0101] Figure 7 It is the deck plate 203, where a is the top view and b is the side view;

[0102] Figure 8 It is the slow step plate 204, where a is the front view and b is the side view;

[0103] Figure 9 It is the reinforcing rib 205. Among them, a is the front view and b is the side view;

[0104] Figure 10 It is the limit block 206. Among them, a is the front view and b is the top view;

[0105] Figure 11 It is the transition connection plate 207. Among them, a is the top view and b is the side view;

[0106] Figure 12 It is the dust cover 218. Among them, a is the longitudinal sectional view and b is the front view;

[0107] Figure 13 It is the telescopic platform 300. Among them, a is the top view, b is the side view, c is the bottom view, and d is the sectional view of a specific area in c;

[0108] Figure 14 It is the frame 301. Among them, a is the top view, b is the side view, and c is the bottom view;

[0109] Figure 15 It is the deck plate 302. Among them, a is the top view and b is the side view;

[0110] Figure 16 It is the toothed plate 303. Among them, a is the top view and b is the side view;

[0111] Figure 17 It is the pressure plate 304. Among them, a is the top view and b is the longitudinal sectional view;

[0112] Figure 18 It is the transmission mechanism 400. Among them, a is the front view, b is the bottom view, c is the side view, and d is the axonometric view;

[0113] Figure 19 It is the driving wheel 401. Among them, a is the front view, b is the side view, and c is the longitudinal sectional view;

[0114] Figure 20 It is the driven wheel 402. Among them, a is the front view, b is the side view, and c is the longitudinal sectional view;

[0115] Figure 21 It is the driving wheel bracket 403. Among them, a is the front view and b is the side view;

[0116] Figure 22 It is the left driven wheel bracket 404. Among them, a is the front view, b is the side view, and c is the top view;

[0117] Figure 23 It is the bearing block 406. Among them, a is the front view and b is the longitudinal sectional view;

[0118] Figure 24 This is the protective cover 407, where a is the front view and b is the top view;

[0119] Figure 25 This is a schematic diagram of the shaft 408;

[0120] Figure 26 This is the handle 409, where a is the front view and b is the side view;

[0121] Among them, 100 is the basic frame, 200 is the fixed platform, 300 is the telescopic platform, 400 is the transmission mechanism, 101 is the cross beam, 102 is the transition beam, 103 is the longitudinal beam, 104 is the intermediate beam, 105 is the spacer, 106 is the connecting plate, 107 is the connecting plate, 108 is the blanking plate, 201 is the side guide rail, 202 is the intermediate guide rail, 203 is the deck plate, 204 is the slow step plate, 205 is the stiffening rib, 206 is the limit block, 207 is the transition connecting plate, 208 is the screw, 209 is the nut, 210 is the screw, 211 is the screw, 212 is the screw, 213 is the spring washer, 214 is the nut, 215 is the bolt, 216 is the spring washer, 217 is the screw, 218 is the dust cover, 301 is the frame, 302 is the deck plate, 303 is the toothed plate, 304 is the pressure plate, 305 is the bearing, 306 is the screw, 307 is the spring washer, 308 is the screw, 309 is the spring washer, 310 is the countersunk head screw, 311 is the screw, 312 is the spring washer, 313 is the cylindrical pin, 401 is the driving wheel, 402 is the driven wheel, 403 is the driving wheel bracket, 404 is the left driven wheel bracket, 405 is the right driven wheel bracket, 406 is the bearing seat, 407 is the protective cover, 408 is the shaft, 409 is the handle, 410 is the reducer, 411 is the coupling, 412 is the synchronous belt, 2181 is the end cover, 2182 is the screw rod, 2183 is the cotton string, 2184 is the nut, 4011 is the pulley, 4012 is the bearing seat, 4013 is the perforated end cover, 4014 is the end cover, 4015 is the shaft, 4016 is the bearing, 4017 is the retaining ring, 4018 is the flat key, 4019 is the flat key, 4021 is the pulley, 4022 is the bearing seat, 4023 is the end cover, 4024 is the shaft, 4025 is the bearing, 4026 is the retaining ring, 4027 is the flat key, 4028 is the screw, 4061 is the bushing, 4062 is the shaft, 4063 is the nut, 4064 is the bearing, 4091 is the fork-shaped part, 4092 is the round tube, 4093 is the spline shaft, 4094 is the handle. Detailed implementation mode

[0122] Device Example 1

[0123] A telescopic platform mechanism for a trestle as described in this application has a structure as Figures 1 to 26 shown. Specifically, it includes a basic frame 100, a fixed platform 200, a telescopic platform 300, and a transmission mechanism 400;

[0124] The base frame 100 is bolted to the fixed platform 200; the base frame 100 is bolted to the telescopic platform 300; the fixed platform 200 is bolted to the transmission mechanism 400;

[0125] The telescopic platform 300 is bolted to the transmission mechanism 400; the telescopic platform 300 is telescoped through the transmission mechanism 400.

[0126] The base frame 100 is welded by cross beams 101, transition beams 102, longitudinal beams 103, intermediate beams 104, pads 105, connecting plates 106, connecting plates 107, and closing plates 108;

[0127] The fixed platform 200 consists of side guides 201, intermediate guides 202, deck plates 203, slow boards 204, reinforcing ribs 205, limit blocks 206, transition connecting plates 207, screws 208, nuts 209, screws 210, screws 211, screws 212, spring washers 213, nuts 214, bolts 215, spring washers 216, screws 217, and dust covers 218;

[0128] The telescopic platform 300 consists of a frame 301, deck plates 302, toothed plates 303, pressing plates 304, bearings 305, screws 306, spring washers 307, screws 308, spring washers 309, countersunk head screws 310, screws 311, spring washers 312, and cylindrical pins 313;

[0129] The transmission mechanism 400 consists of a driving wheel 401, a driven wheel 402, a driving wheel bracket 403, a left driven wheel bracket 404, a right driven wheel bracket 405, a bearing block 406, a protective cover 407, a shaft 408, a handle 409, a speed reducer 410, a coupling 411, and a synchronous belt 412.

[0130] There are 12 M6 threaded holes on the upper plane of the transition beam 102 for connecting the deck plate 203;

[0131] There are 12 Φ11mm through holes on the side surface of the transition beam 102 for connecting the transition connecting plate 207 in the fixed platform 200;

[0132] There are 7 M8 threaded holes on the upper plane of the longitudinal beam 103 for connecting the side guide 201;

[0133] There are 14 M8 threaded holes on the upper plane of the intermediate beam 104 for connecting the intermediate guide 202;

[0134] There are 8 M10 threaded holes on the connecting plate 106 and 4 M10 threaded holes on the connecting plate 107.

[0135] The side guide 201 has a C-shaped structure;

[0136] Seven Φ8.5 mm counterbore holes are made on the lower plane of the side guide rail 201, and seven Φ15 mm through holes are correspondingly made on the upper plane. The screw 217 passes through the Φ15 mm hole, is installed in the Φ8.5 mm counterbore hole and is screwed to the basic frame 100;

[0137] One Φ6.5 mm counterbore hole is made on the lower plane of the side guide rail 201, and the limit block 206 is screwed to the side guide rail 201 through the screw 208 and the nut 209;

[0138] Five M6 threaded holes are made on the upper plane of the side guide rail 201, and the deck plate 203 is screwed to the side guide rail 201 through the screw 210;

[0139] Four M6 threaded holes are made on the side surface of the side guide rail 201, and the transition connecting plate 207 is screwed to the side guide rail 201 through the screw 212 and the spring washer 213;

[0140] The middle guide rail 202 has an I-shaped structure, which is equivalent to two side guide rails 201 arranged oppositely on the sides, and the assembly form is the same as that of the side guide rail 201;

[0141] Eighteen Φ6.5 mm counterbore holes are made on the four sides of the front surface of the deck plate 203. Among them, four at the upper end are used for screwing to the transition beam 102, four at the lower end are used for screwing the slow step plate 204, and five on each of the left and right sides are used for screwing to the middle of the side guide rail 201 and the middle guide rail 202;

[0142] Ten Φ4.2 mm counterbore holes are made in the middle part of the front surface of the deck plate 203, and the reinforcing rib 205 is screwed to the deck plate 203 through the screw 211;

[0143] One locking hole is made at the upper end of the deck plate 203 for the passage of the handle 409 during manual transmission and the installation of the dust cover 218 during rest; the slow step plate 204 is used for workers to walk slowly and prevent bumping when walking from the fixed platform 200 to the telescopic platform 300, and the slow step plate 204 is provided with four M6 threaded holes for connecting to the deck plate 203;

[0144] Ten M4 threaded holes are made on the reinforcing rib 205 for connecting to the deck plate 203 to increase the strength of the deck plate 203;

[0145] The limit block 206 is provided with an oblong hole to prevent the nut 209 from rotating;

[0146] Four Φ6.5 mm through holes are made on the transition connecting plate 207 for connecting to the side guide rail 201 and the middle guide rail 202;

[0147] The transition connecting plate 207 is provided with 4 Φ10.5mm through holes and is connected to the transition beam 102 through nuts 214, bolts 215 and spring washers 216;

[0148] The dust cover 218 is composed of an end cover 2181, a screw rod 2182, a cotton cord 2183 and a nut 2184;

[0149] The cotton cord 2183 is tied in the radial hole of the screw rod 2182;

[0150] The screw rod 2182 passes through the end cover 2181 and is fixed with a nut 2184.

[0151] The frame 301 is welded by a bottom cross beam 3011, a middle cross beam 3012, a middle longitudinal beam 3013, side plates 3014, a first reinforcing plate 3015, a second reinforcing plate 3016 and a third reinforcing plate 3017;

[0152] The middle cross beam 3012 is provided with 12 M6 threaded holes for connecting the deck plate 302;

[0153] The side plates 3014 are provided with 8 M10 threaded holes and 4 Φ6mm pin holes, and are connected to the bearing 305 through screws 311, spring washers 312 and cylindrical pins 313;

[0154] The third reinforcing plate 3017 is provided with 4 M6 threaded holes for connecting the pressing plate 304;

[0155] The deck plate 302 is provided with 12 Φ6.5mm counterbore holes and is connected to the frame 301 through countersunk head screws 310;

[0156] The toothed plate 303 has a toothed structure, and the shape of the toothed structure is machined according to the tooth profile of the synchronous belt 412;

[0157] The toothed plate 303 is provided with 6 Φ5.5mm through holes, and the toothed belt is connected to the pressing plate 304 through screws 306 and spring washers 307;

[0158] The pressing plate 304 is provided with 4 Φ6mm counterbore holes and is connected to the third reinforcing plate 3017 through screws 308 and spring washers 309;

[0159] The pressing plate 304 is provided with 4 M5 threaded holes for connecting the toothed plate 303;

[0160] There are four groups of the bearings 305, and the four groups of bearings 305 are installed in the side guide rails 201 and the middle guide rail 202 to drive the overall telescopic platform 300 to realize the telescopic guidance of the telescopic platform 300.

[0161] The driving wheel 401 is composed of a belt pulley 4011, a bearing seat 4012, a perforated end cover 4013, an end cover 4014, a shaft 4015, bearings 4016, retaining rings 4017, flat keys 4018, and flat keys 4019;

[0162] The belt pulley 4011 is designed according to the synchronous belt 412. The two sides of the teeth of the belt pulley 4011 are provided with shoulders, and the two end faces are provided with bosses for limiting the inner ring of the bearing 4016. The middle hole is provided with a keyway and is positioned and connected to the shaft 4015 through the flat key 4018;

[0163] The left side of the bearing seat 4012 is provided with a rectangular groove for the belt pulley 4011 to drive the outlet of the synchronous belt 412;

[0164] The front and rear surfaces of the bearing seat 4012 are provided with bearing holes for installing the bearings 4016, and are provided with end cover holes for installing the end cover 4014;

[0165] The bearing seat 4012 is provided with threaded holes for connecting the end cover 4014;

[0166] The right side of the bearing seat 4012 is provided with 4 M10 threaded holes for connecting to the driving wheel bracket 403;

[0167] The bottom surface of the bearing seat 4012 is provided with 2 M6 threaded holes for connecting the protective cover 407;

[0168] The shaft 4015 consists of two ends with different diameters;

[0169] The shaft end of the bearing seat 4012 is provided with a shoulder for limiting the inner ring of the bearing 4016. The bearings 4016, the belt pulley 4011, the bearings 4016, and the perforated end cover 4013 are inserted in sequence and the inner ring of the bearing 4016 is limited by the retaining ring 4017. A flat key 4018 is made on the smaller diameter section of the shaft 4015 and inserted into the coupling 411;

[0170] The driven wheel 402 is composed of a belt pulley 4021, a bearing seat 4022, an end cover 4023, a shaft 4024, bearings 4025, retaining rings 4026, flat keys 4027, and screws 4028;

[0171] The belt pulley 4021 is designed according to the synchronous belt 412. The two sides of the teeth of the belt pulley 4021 are provided with shoulders, and the two end faces are provided with bosses for limiting the inner ring of the bearing 4025. The middle hole is provided with a keyway and is positioned and connected to the shaft 4024 through the flat key 4027;

[0172] The left side of the bearing seat 4022 is provided with a rectangular hole for the belt pulley 4021 to drive the outlet of the synchronous belt 412;

[0173] The front and rear surfaces of the bearing seat 4022 are manufactured with bearing holes for installing the bearings 4025, and are provided with end cover holes for installing the end cover 4023;

[0174] The bearing housing 4022 is provided with threaded holes and is connected to the end cover 4023 by screws;

[0175] On the right side of the bearing housing 4022, there are 4 M10 threaded holes for connection to the left driven wheel bracket 404 and the right driven wheel bracket 405;

[0176] On the bottom surface of the bearing housing 4022, there are 2 M6 threaded holes for connection to the protective cover 407;

[0177] At both ends of the shaft 4024, there are clamping grooves for installing snap rings 4026 to limit the inner ring of the bearing 4025;

[0178] The driving wheel bracket 403 is provided with 4 Φ11mm through holes for connection to the driving wheel 401;

[0179] The driving wheel 403 is provided with 4 Φ8.5mm counterbore holes for connection to the transition connecting plate 207;

[0180] On the vertical surface of the left driven wheel bracket 404, there are 4 Φ11mm through holes for connection to the basic frame 100;

[0181] On the bottom surface of the left driven wheel bracket 404, there are 4 Φ11mm through holes for connection to the driven wheel 402;

[0182] The right driven wheel bracket 405 is symmetrical to the left driven wheel bracket 404 and has the same structural function;

[0183] The bearing housing 406 is composed of a bushing 4061, a shaft 4062, a nut 4063, and a bearing 4064;

[0184] On the ear seat of the bushing 4061, there is a bearing hole for limiting the outer ring of the bearing 4064;

[0185] On the vertical surface of the ear seat of the bushing 4061, there are 8 Φ8.5mm through holes. The upper 4 are for connection to the transition connecting plate 207, and the lower 4 are for connection to the reducer 410;

[0186] The upper end of the shaft 4062 has a shoulder for limiting the inner ring of the bearing;

[0187] The lower end of the shaft 4062 is provided with threads. After passing through the ear seat, it is tightened with a nut 4063 and is also used to limit the inner ring of the bearing 4064;

[0188] The upper end of the shaft 4062 is manufactured into an internal spline to cooperate with the handle 409 for transmission input, and to cooperate with the dust cover 218 for dust prevention when stationary;

[0189] The lower end of the shaft 4062 is provided with a keyway hole for connection to the input shaft of the speed reducer 410;

[0190] The bearing housing 406 is connected to the transition connecting plate 207 through 8 M10 threaded holes formed on the connecting plate 106 and 4 M10 threaded holes formed on the connecting plate 107;

[0191] The protective cover 407 has a U-shaped structure, and long round holes are formed at both ends for connection to the driving wheel 401 and the driven wheel 402, so as to prevent workers from being pinched when the synchronous belt 412 is driven;

[0192] The middle and both ends of the shaft 408 are provided with keyways. The middle section is inserted into the output hole of the speed reducer 410, and both ends are respectively inserted into the couplings 411, so that the two groups of synchronous belts are synchronously driven;

[0193] The handle 409 is composed of a fork-shaped part 4091, a round tube 4092, a spline shaft 4093, and a handle 4094;

[0194] The fork-shaped part 4091, the round tube 4092, and the spline shaft 4093 are connected by welding, and the two handles 4094 are screwed on the fork-shaped part 4091;

[0195] The spline shaft 4093 is made into a spline to cooperate with the shaft 4062 for transmission input;

[0196] The end cover 2181 is provided with a spline for connection to the spline shaft 4093.

[0197] The floor plate 203 is a patterned aluminum plate.

[0198] The protective cover 407 is a sheet metal part.

[0199] Embodiment 1

[0200] A trestle using the device described in Device Example 1 is adopted.

[0201] 1. Move the trestle to the designated position at the assembly station or under the rack. At this time, the telescopic platform 300 is in a retracted state.

[0202] 2. Open the dust cover 218, use the handle 409 to screw and insert into the shaft 4062 and turn it, driving the speed reducer 410 to rotate; through the shaft 408, the output at both ends is reversed and synchronized to the driving wheel 401, cooperating with the driven wheel 402 to drive the synchronous belt 412 to move; through the toothed plate 303 and the pressure plate 304 connected to the synchronous belt 412, the entire telescopic platform 300 is extended to the target position in the side guide rail 201 and the middle guide rail 202 grooves of the fixed platform 200.

[0203] 3. After the work is completed, use the handle 409 to reverse and turn the shaft 4062 to retract the telescopic platform 300 back to the starting position, and retract the trestle to the storage place to make room for the product to be taken off the shelf.

Claims

1. A telescopic platform mechanism for a trestle, characterized in that the telescopic platform mechanism comprises a base frame (100), a fixed platform (200), a telescopic platform (300) and a transmission mechanism (400); the base frame (100) is bolted to the fixed platform (200); the base frame (100) is bolted to the telescopic platform (300); the fixed platform (200) is bolted to the transmission mechanism (400); the telescopic platform (300) is bolted to the transmission mechanism (400); the telescopic platform (300) is telescoped by the transmission mechanism (400).

2. The telescopic platform mechanism for a trestle according to claim 1, characterized in that the base frame (100) is welded by cross beams (101), transition beams (102), longitudinal beams (103), intermediate beams (104), cushion blocks (105), connecting plates (106), connecting plates (107), and closing plates (108); the fixed platform (200) consists of side guides (201), intermediate guides (202), deck plates (203), slow step plates (204), stiffeners (205), limit blocks (206), transition connecting plates (207), screws (208), nuts (209), screws (210), screws (211), screws (212), spring washers (213), nuts (214), bolts (215), spring washers (216), screws (217), and dust covers (218); the telescopic platform (300) consists of a frame (301), deck plates (302), toothed plates (303), pressing plates (304), bearings (305), screws (306), spring washers (307), screws (308), spring washers (309), countersunk head screws (310), screws (311), spring washers (312), and cylindrical pins (313); the transmission mechanism (400) consists of a driving wheel (401), a driven wheel (402), a driving wheel bracket (403), a left driven wheel bracket (404), a right driven wheel bracket (405), a bearing seat (406), a protective cover (407), a shaft (408), a handle (409), a speed reducer (410), a coupling (411), and a synchronous belt (412).

3. The telescopic platform mechanism for a trestle according to claim 2, characterized in that 12 M6 threaded holes are machined on the upper plane of the transition beam (102) for connecting the deck plate (203); 12 Φ11mm through holes are machined on the side surface of the transition beam (102) for connecting the transition connecting plate (207) in the fixed platform (200); 7 M8 threaded holes are machined on the upper plane of the longitudinal beam (103) for connecting the side guides (201); 14 M8 threaded holes are machined on the upper plane of the intermediate beam (104) for connecting the intermediate guides (202); 8 M10 threaded holes are machined on the connecting plate (106), and 4 M10 threaded holes are machined on the connecting plate (107).

4. The telescopic platform mechanism for a trestle according to claim 2, characterized in that The side guide rail (201) has a C-shaped structure; Seven Φ8.5mm countersunk holes are machined on the lower plane of the side guide rail (201), and seven Φ15mm through holes are correspondingly machined on the upper plane. The screw (217) passes through the Φ15mm hole and is installed into the Φ8.5mm countersunk hole and screwed onto the base frame (100); One Φ6.5mm counterbore is machined on the lower plane of the side guide rail (201), and the limit block (206) is screwed onto the side guide rail (201) through the screw (208) and the nut (209); Five M6 threaded holes are machined on the upper plane of the side guide rail (201), and the deck plate (203) is screwed onto the side guide rail (201) through the screw (210); Four M6 threaded holes are machined on the side of the side guide rail (201), and the transition connecting plate (207) is screwed onto the side guide rail (201) through the screw (212) and the spring washer (213); The intermediate guide rail (202) has an I-shaped structure, which is equivalent to two side guide rails (201) arranged oppositely on the sides, and the assembly form is the same as that of the side guide rail (201); Eighteen Φ6.5mm counterbore holes are machined on the four sides of the front of the deck plate (203). Among them, four at the upper end are used for screwing onto the transition beam (102), four at the lower end are used for screwing onto the slow step plate (204), and five on each of the left and right sides are used for screwing onto the side guide rail (201) and the intermediate guide rail (202); Ten Φ4.2mm counterbore holes are machined in the middle part of the front of the deck plate (203), and the reinforcing rib (205) is screwed onto the deck plate (203) through the screw (211); One lock hole is machined at the upper end of the deck plate (203), which is used for the passage of the handle (409) during manual transmission and the installation of the dust cover (218) when at rest. The slow step plate (204) is used for the worker to walk slowly and prevent knocking when walking from the fixed platform (200) to the telescopic platform (300). The slow step plate (204) is machined with four M6 threaded holes for connecting to the deck plate (203); The reinforcing rib (205) is machined with ten M4 threaded holes for connecting to the deck plate (203) to increase the strength of the deck plate (203); The limit block (206) is machined with an oblong hole to prevent the nut (209) from rotating; The transition connecting plate (207) is machined with four Φ6.5mm through holes for connecting to the side guide rail (201) and the intermediate guide rail (202); The transition connecting plate (207) is machined with four Φ10.5mm through holes and is connected to the transition beam (102) through the nut (214), the bolt (215), and the spring washer (216); The dust cover (218) is composed of an end cover (2181), a screw rod (2182), a cotton string (2183), and a nut (2184); The cotton string (2183) is tied in the radial hole of the screw rod (2182); The screw rod (2182) passes through the end cover (2181) and is fixed with the nut (2184).

5. The telescopic platform mechanism for a trestle according to claim 2, wherein The frame (301) is welded by a bottom cross beam (3011), a middle cross beam (3012), a middle longitudinal beam (3013), side plates (3014), a first reinforcing plate (3015), a second reinforcing plate (3016), and a third reinforcing plate (3017); There are 12 M6 threaded holes on the middle cross beam (3012) for connecting the deck plate (302); The side plates (3014) are provided with 8 M10 threaded holes and 4 Φ6mm pin holes, and are connected to the bearing (305) through screws (311), spring washers (312), and cylindrical pins (313); There are 4 M6 threaded holes on the third reinforcing plate (3017) for connecting the pressing plate (304); There are 12 Φ6.5mm counterbored holes on the deck plate (302), and are connected to the frame (301) through countersunk head screws (310); The toothed plate (303) has a toothed structure, and the shape of the toothed structure is machined according to the tooth profile of the synchronous belt (412); The toothed plate (303) is provided with 6 Φ5.5mm through holes, and the toothed belt is connected to the pressing plate (304) through screws (306) and spring washers (307); There are 4 Φ6mm countersunk holes on the pressing plate (304), and are connected to the third reinforcing plate (3017) through screws (308) and spring washers (309); The pressing plate (304) is provided with 4 M5 threaded holes for connecting the toothed plate (303); There are four groups of bearings (305), and the four groups of bearings (305) are installed in the side guide rails (201) and the middle guide rails (202) to drive the overall telescopic platform (300) to realize the telescopic guidance of the telescopic platform (300).

6. The telescopic platform mechanism for a trestle according to claim 2, wherein The driving wheel (401) is composed of a belt pulley (4011), a bearing seat (4012), a perforated end cover (4013), an end cover (4014), a shaft (4015), bearings (4016), a retaining ring (4017), a flat key (4018), and a flat key (4019); The belt pulley (4011) is designed according to the synchronous belt (412). There are shoulders on both sides of the teeth of the belt pulley (4011), and there are bosses on both end faces for limiting the inner ring of the bearing (4016). There is a keyway in the middle hole and is positioned and connected to the shaft (4015) through the flat key (4018); There is a rectangular groove on the left side of the bearing seat (4012) for the belt pulley (4011) to drive the outlet of the synchronous belt (412); There are bearing holes on the front and rear surfaces of the bearing seat (4012) for installing the bearings (4016), and there are end cover holes for installing the end cover (4014); The bearing seat (4012) is provided with threaded holes for connecting the end cover (4014); There are 4 M10 threaded holes on the right side of the bearing seat (4012) for connecting to the driving wheel bracket (403); There are 2 M6 threaded holes on the bottom surface of the bearing seat (4012) for connecting the protective cover (407); The shaft (4015) consists of two ends with different diameters; The shaft end of the bearing housing (4012) is provided with a shoulder for limiting the inner ring of the bearing (4016). The bearing (4016), pulley (4011), bearing (4016), and perforated end cover (4013) are inserted in sequence, and a retaining ring (4017) is used to limit the inner ring of the bearing (4016). A flat key (4018) is made on a smaller diameter section of the shaft (4015) and inserted into the coupling (411). The driven wheel (402) consists of a pulley (4021), a bearing housing (4022), an end cover (4023), a shaft (4024), a bearing (4025), a retaining ring (4026), a flat key (4027), and a screw (4028). The pulley (4021) is designed according to the synchronous belt (412). The two sides of the teeth of the pulley (4021) are provided with shoulders, and the two end faces are provided with bosses for limiting the inner ring of the bearing (4025). The middle hole is provided with a keyway and is positioned and connected to the shaft (4024) through a flat key (4027). A rectangular hole is made on the left side of the bearing housing (4022) for the pulley (4021) to drive the outlet of the synchronous belt (412). Bearing holes are made on the front and rear surfaces of the bearing housing (4022) for installing the bearing (4025), and end cover holes are made for installing the end cover (4023). Threaded holes are made on the bearing housing (4022), and the end cover (4023) is connected by screws. Four M10 threaded holes are made on the right side of the bearing housing (4022) for connecting to the left driven wheel bracket (404) and the right driven wheel bracket (405). Two M6 threaded holes are made on the bottom surface of the bearing housing (4022) for connecting the protective cover (407). Slots are made at both ends of the shaft (4024) for installing a retaining ring (4026) to limit the inner ring of the bearing (4025). Four Φ11mm through holes are made on the drive wheel bracket (403) for connecting the drive wheel (401). Four Φ8.5mm counterbore holes are made on the 403 - drive wheel for connecting to the transition connecting plate (207). Four Φ11mm through holes are made on the vertical surface of the left driven wheel bracket (404) for connecting to the base frame (100). Four Φ11mm through holes are made on the bottom surface of the left driven wheel bracket (404) for connecting the driven wheel (402). The right driven wheel bracket (405) is symmetrical to the left driven wheel bracket (404), and they have the same structural functions. The bearing housing (406) consists of a bushing (4061), a shaft (4062), a nut (4063), and a bearing (4064). Bearing holes are made on the ear seats of the bushing (4061) for limiting the outer ring of the bearing (4064). Eight Φ8.5mm through holes are made on the vertical surface of the ear seats of the bushing (4061). The upper four are used for connecting to the transition connecting plate (207), and the lower four are used for connecting to the reducer (410). The upper end of the shaft (4062) is provided with a shoulder for limiting the inner ring of the bearing. Threads are made at the lower end of the shaft (4062). After passing through the ear seat, it is tightened with a nut (4063) and is also used for limiting the inner ring of the bearing (4064). The upper end of the shaft (4062) is manufactured with internal splines to cooperate with the handle (409) for transmission input, and to cooperate with the dust cover (218) for dust prevention when at rest; The lower end of the shaft (4062) is made with a keyway hole to connect with the input shaft of the reducer (410); The bearing seat (406) is connected to the transition connecting plate (207) through 8 M10 threaded holes made on the connecting plate (106) and 4 M10 threaded holes made on the connecting plate (107); The protective cover (407) has a U-shaped structure, and long round holes are manufactured at both ends for connecting to the driving wheel (401) and the driven wheel (402), to prevent workers from being pinched during the synchronous belt (412) transmission; The middle and both ends of the shaft (408) are provided with keyways. The middle section is inserted into the output hole of the reducer (410), and both ends are respectively inserted into the couplings (411) to make the two groups of synchronous belts drive synchronously; The handle (409) is composed of a fork-shaped part (4091), a round tube (4092), a spline shaft (4093), and a handle (4094); The fork-shaped part (4091), the round tube (4092), and the spline shaft (4093) are connected by welding, and the two handles (4094) are screwed onto the fork-shaped part (4091); The spline shaft (4093) is made into splines to cooperate with the shaft (4062) for transmission input; The end cover (2181) is made with splines for connecting with the spline shaft (4093).

7. The telescopic platform mechanism for a trestle according to claim 4, characterized in that, The deck plate (203) is a pattern aluminum plate.

8. The telescopic platform mechanism for a trestle according to claim 6, characterized in that, The protective cover (407) is a sheet metal part.

9. A trestle, characterized in that, It is provided with the telescopic platform mechanism for a trestle according to any one of claims 1 to 8.

10. A method for using the trestle according to claim 9, characterized in that, Move the trestle to the designated position, at this time the telescopic platform (300) is in a retracted state; open the dust cover (218), use the handle (409) to screw and insert into the shaft (4062) and turn it, driving the reducer (410) to rotate; through the shaft (408), the output at both ends is reversed to synchronize to the driving wheel (401), and cooperate with the driven wheel (402) to drive the synchronous belt (412) to move; drive the entire telescopic platform (300) to extend to the target position in the side guide rail (201) and the middle guide rail (202) grooves of the fixed platform (200) through the toothed plate (303) and the pressing plate (304) connected to the synchronous belt; after the work is completed, use the handle (409) to reverse and turn the shaft (4062) to retract the telescopic platform (300) back to the starting position, and retreat the trestle to the storage place.

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