CN115923903A - Flat car with fixed effect - Google Patents

Abstract

The invention discloses a flat car with a fixing effect, which relates to the technical field of flat cars and comprises a chassis and an extension assembly, wherein four corners below the chassis are fixedly connected with idler wheels, the extension assembly is symmetrically arranged on the front side and the rear side of the upper part of the chassis, the extension assembly comprises sliding chutes, sliding rails, sliding strips, sliding plates, clamping holes, sliding cavities, pistons, connecting rods and ejector rods, the sliding chutes are symmetrically arranged on the front side and the rear side of the upper part of the chassis, the sliding rails are symmetrically arranged on the left side and the right side of the sliding chutes, the sliding strips are connected in the sliding rails in an embedded mode, the sliding plates are fixedly connected between the sliding strips, the clamping holes are arranged on the lower surface of the sliding plates, the sliding cavities are arranged in the sliding plates, the pistons are connected in the sliding cavities in a sliding mode, the connecting rods are fixedly connected to one side of the pistons, and the ejector rods are fixedly connected to one ends, far away from the pistons, of the connecting rods. When articles are placed, the bearing surface can be expanded according to the size of the articles, and the articles can be automatically fixed when placed.

Description

Flat car with fixed effect

Technical Field

The invention relates to the technical field of flat cars, in particular to a flat car with a fixing effect.

Background

The flat car is a small tool used for pushing and pulling goods in daily life, and has the advantages of convenience and labor saving.

A flatbed is disclosed in patent application No. CN 202010599608.6. The invention realizes emergency braking of the flat car and maintains the safety of field operators. The first braking system and the second braking system can realize braking of the trolley and can mutually make up respective defects, but the invention patent is not convenient for expanding the bearing surface when placing articles, is not stable when placing articles with larger size, is not convenient for fixing the articles, and can cause the articles to fall off the trolley due to bumping in the process of carrying the articles.

In view of the above, a flat car with a fixing effect is proposed by improving the conventional structure and defects.

Disclosure of Invention

The invention aims to provide a flat car with a fixing effect to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a flatbed with fixed effect, includes chassis and extension subassembly, chassis below four corners fixedly connected with gyro wheel, the extension subassembly symmetry sets up both sides around chassis upper portion, the extension subassembly includes spout, slide rail, draw runner, slide, card hole, smooth chamber, piston, connecting rod and ejector pin, the spout has been seted up to bilateral symmetry around chassis upper portion, and the slide rail has been seted up to spout left and right sides symmetry, the gomphosis is connected with the draw runner in the slide rail, and fixedly connected with slide between the draw runner, the card hole has been seted up to the slide lower surface, and has seted up smooth chamber in the slide, sliding connection has the piston in the smooth chamber, and piston one side fixedly connected with connecting rod, the one end fixedly connected with ejector pin of piston is kept away from to the connecting rod.

Further, the spout respectively is provided with threely in both sides around the chassis, and the slide passes through spout and chassis sliding connection, the slide is the E font, and slide upper surface and chassis upper surface parallel and level, the card hole distributes at slide lower surface equidistance.

Furthermore, the extension assembly further comprises a support column, balls, a bearing spring, a bearing plate and a resistance rod, wherein the support column is symmetrically and fixedly connected below the sliding plate, the balls are embedded and connected to the lower end of the support column, the bearing spring is fixedly connected above the sliding plate, the bearing plate is fixedly connected above the bearing spring, and the resistance rod is arranged on the inner side of the bearing spring.

Further, both sides are provided with spacing subassembly around the chassis lower part, spacing subassembly includes air flue, card chamber, jump ring, cock board and kelly, both sides are provided with the air flue around the chassis lower part, and air flue one end is provided with the card chamber, the air flue is the L font, card intracavity fixedly connected with jump ring, and jump ring upper end fixedly connected with cock board, cock board top fixedly connected with kelly, and the kelly is connected with the slide block through calorie hole, cock board and card chamber laminating, and cock board and card chamber sliding connection.

Further, an air cavity is formed in the middle of the upper surface of the chassis, air pipes are symmetrically arranged on the front side and the rear side of the air cavity, an air bag is arranged above the air cavity, a top plate is fixedly connected to the upper portion of the air bag, the air pipes are connected with the sliding plate in a sliding mode through sliding cavities, the air pipes are communicated with the clamping cavities through air passages, and the upper surface of the top plate is flush with the bearing plate.

Further, the gas chamber gomphosis is connected with the clamp plate, and clamp plate below fixedly connected with depression bar, depression bar below fixedly connected with backing plate, and backing plate below fixedly connected with slipmat, surface symmetry fixedly connected with reset spring on the backing plate, and the backing plate passes through reset spring and chassis elastic connection, bilateral symmetry is provided with the electromagnetism piece around the depression bar, and electromagnetism piece and chassis fixed connection.

Further, both sides symmetry is provided with fixed subassembly around the extension subassembly, fixed subassembly includes bottom plate, sliding frame and guide rail, one side that the chassis was kept away from to the slide rotates and is connected with the bottom plate, and the bottom plate is close to one side lower part symmetry fixedly connected with sliding frame of slide, the guide rail has been seted up on sliding frame surface, and the guide rail is the arc, the ejector pin passes through guide rail and sliding frame sliding connection.

Further, fixed subassembly still includes buffer spring, buffer beam and splint, fixed surface is connected with buffer spring on the bottom plate, and the buffer spring inboard is provided with the buffer beam, buffer spring upper end fixedly connected with splint, and splint pass through buffer spring and bottom plate elastic connection, the buffer beam both ends respectively with bottom plate, splint fixed connection.

Further, both sides symmetry fixedly connected with baffle before and after the chassis upper surface, and the right-hand fixedly connected with in chassis draws the handle, be provided with the switch on drawing the handle, the chamber of accomodating has been seted up to the chassis right part.

Further, the storage battery is placed in the storage cavity, the cover plate is connected to the right of the storage cavity in a rotating mode, a magnet is arranged below the storage cavity, and the switch is connected with the storage battery and the electromagnet through a circuit.

The invention provides a flat car with a fixing effect, which has the following beneficial effects: when placing articles, the carrying surface can be expanded according to the size of the articles, and the articles can be automatically fixed when placed.

1. When articles are placed, the sliding plate can be pulled out of the sliding groove according to the size of the articles, so that the bearing area of the flat car is expanded, the articles are stably placed on the flat car, the phenomenon that the articles exceed the flat car and fall over due to too much articles when the articles are placed is avoided, the sliding strip can limit the sliding plate through the sliding rail before and after the sliding plate moves, the sliding plate is prevented from deflecting, and the support rod can provide support for the sliding plate.

2. When articles are placed, the top plate can be pressed down by the articles, so that gas in the air bag is extruded into the air cavity and then is sent into the air passage through the air pipe, the plug plate is jacked up in the clamping cavity, the clamping rod is jacked out of the clamping cavity, the clamping rod is clamped with the sliding plate through the clamping hole, the clamping plate is limited, the phenomenon that the sliding plate moves to cause loosening of the fixed articles during carrying is avoided, and when the sliding plate slides, the plug plate can take the clamping rod into the clamping cavity under the action of the clamping spring because the articles are not placed, and the sliding plate cannot move.

3. When articles are placed, gas in the air bag can enter the sliding cavity from the air pipe, so that the piston moves in the sliding cavity, the connecting rod drives the ejector rod to slide in the sliding frame through the guide rail, the bottom plate is further driven to rotate on the sliding plate, the clamping plate fixes the articles, the buffer spring can buffer the clamping force, and the package is prevented from being damaged.

4. When articles are placed, the pressing plate can be pressed to descend in the air cavity after air enters the air cavity, so that the base plate is pressed down through the pressing plate, the anti-skid pad is pressed on the ground, the position of the flat car is fixed, the phenomenon that the articles are placed obliquely due to the fact that the flat car moves when the articles are placed is avoided, the articles are unbalanced and overturned, and the base plate can be close to the chassis under the action of the reset spring when the articles are placed, and the movement of the flat car cannot be influenced.

5. When the flat car is moved, the switch is pressed down, the storage battery can electrify the electromagnetic block, so that the base plate is sucked up, the base plate drives the anti-slip mat to be away from the ground, the fixing of the flat car is released, the air bag, the bearing spring and the buffer spring can buffer articles when the flat car bumps, the top plate and the bearing plate can be always kept parallel and level, the articles are prevented from deflecting on the flat car, meanwhile, the articles can be prevented from dropping or being damaged due to bumping, the baffle can limit the articles, the articles are prevented from dropping on and off the slope, the cover plate can seal the storage cavity under the action of the magnet, the storage battery is prevented from dropping from the flat car, and the storage battery can be taken out of the storage cavity only by turning the cover plate when the storage battery is replaced.

Drawings

FIG. 1 is a schematic overall front view of a flat car with a fixing effect according to the present invention;

FIG. 2 is an enlarged schematic view of a flat car with a fixing effect shown in FIG. 1;

FIG. 3 is a schematic cross-sectional left side view of a flat car with a fixing effect according to the present invention;

FIG. 4 is an enlarged schematic view of a flat car with a fixing effect at B in FIG. 3;

FIG. 5 is an enlarged schematic view of the flat car with fixing effect shown in FIG. 3 at C;

FIG. 6 is a cross-sectional top view of the chassis of the flat car with fixing effect according to the present invention;

FIG. 7 is a schematic perspective view of a chassis of a flat car with a fixing effect according to the present invention;

fig. 8 is a schematic perspective view of a pressing plate of a flat car with a fixing effect according to the present invention.

In the figure: 1. a chassis; 2. a roller; 3. an expansion component; 301. a chute; 302. a slide rail; 303. a slide bar; 304. a slide plate; 305. a clamping hole; 306. a slide chamber; 307. a piston; 308. a connecting rod; 309. a top rod; 310. a support post; 311. a ball bearing; 312. a load bearing spring; 313. carrying a plate; 314. a resistance bar; 4. a limiting component; 401. an airway; 402. a card cavity; 403. a clamp spring; 404. a plug plate; 405. a clamping rod; 5. an air cavity; 6. an air pipe; 7. an air bag; 8. a top plate; 9. pressing a plate; 10. a pressure lever; 11. a base plate; 12. a non-slip mat; 13. a return spring; 14. an electromagnetic block; 15. a fixing assembly; 1501. a base plate; 1502. a slide frame; 1503. a guide rail; 1504. a buffer spring; 1505. a buffer rod; 1506. a splint; 16. a baffle plate; 17. pulling a handle; 18. a switch; 19. a receiving cavity; 20. a storage battery; 21. a cover plate; 22. and a magnet.

Detailed Description

Referring to fig. 1 to 8, the present invention provides a technical solution: the utility model provides a flatbed with fixed effect, including chassis 1 and extension subassembly 3, chassis 1 below four corners fixedly connected with gyro wheel 2, extension subassembly 3 symmetry sets up in both sides around chassis 1 upper portion, extension subassembly 3 includes spout 301, slide rail 302, draw runner 303, slide 304, card hole 305, smooth chamber 306, piston 307, connecting rod 308 and ejector pin 309, spout 301 has been seted up to 1 upper portion front and back bilateral symmetry on chassis, and spout 301 left and right sides symmetry has seted up slide rail 302, the embedded draw runner 303 that is connected with of slide rail 302, and fixedly connected with slide 304 between the draw runner 303, card hole 305 has been seted up to slide 304 lower surface, and set up smooth chamber 306 in the slide 304, sliding connection has piston 307 in the smooth chamber 306, and piston 307 one side fixedly connected with connecting rod 308, the one end fixedly connected with ejector pin 309 that piston 307 was kept away from to connecting rod 308.

Referring to fig. 1, 3 to 7, three sliding grooves 301 are respectively arranged on the front and rear sides of a chassis 1, a sliding plate 304 is slidably connected with the chassis 1 through the sliding grooves 301, the sliding plate 304 is E-shaped, the upper surface of the sliding plate 304 is flush with the upper surface of the chassis 1, fastening holes 305 are equidistantly distributed on the lower surface of the sliding plate 304, an expansion assembly 3 further includes a support column 310, balls 311, a bearing spring 312, a bearing plate 313 and a resistance rod 314, the support column 310 is symmetrically and fixedly connected below the sliding plate 304, the balls 311 are embedded and connected at the lower end of the support column 310, the bearing spring 312 is fixedly connected above the sliding plate 304, the bearing plate 313 is fixedly connected above the bearing spring 312, the resistance rod 314 is arranged on the inner side of the bearing spring 312, limit assemblies 4 are arranged on the front and rear sides of the lower portion of the chassis 1, the limit assemblies 4 include an air passage 401, a fastening cavity 402, a fastening spring 403, a plug plate 404 and a fastening rod 405, air passages 401 are arranged on the front side and the rear side of the lower portion of the chassis 1, a clamping cavity 402 is arranged at one end of the air passage 401, the air passage 401 is L-shaped, a clamping spring 403 is fixedly connected in the clamping cavity 402, a plug plate 404 is fixedly connected to the upper end of the clamping spring 403, a clamping rod 405 is fixedly connected above the plug plate 404, the clamping rod 405 is connected with the sliding plate 304 in a clamping mode through a clamping hole 305, the plug plate 404 is attached to the clamping cavity 402, the plug plate 404 is connected with the clamping cavity 402 in a sliding mode, an air cavity 5 is formed in the middle of the upper surface of the chassis 1, air pipes 6 are symmetrically arranged on the front side and the rear side of the air cavity 5, an air bag 7 is arranged above the air cavity 5, a top plate 8 is fixedly connected above the air bag 7, the air pipes 6 are connected with the sliding plate 304 in a sliding mode through sliding cavities 306, the air pipes 6 are communicated with the clamping cavity 402 through the air passage 401, and the upper surface of the top plate 8 is flush with the bearing plate 313;

the operation is specifically as follows, when an article is placed, the sliding plate 304 can be drawn out of the sliding groove 301 according to the size of the article, so as to expand the carrying area of the flat car, thereby stably placing the article on the flat car, avoiding overturning of the article due to the fact that the article exceeds the flat car when the article is placed, the sliding bar 303 can limit the sliding plate 304 through the sliding rail 302 before and after the sliding plate 304 moves, avoiding the sliding plate 304 from deflecting, the supporting rod can provide support for the sliding plate 304, after the article is placed, the article can press the top plate 8 down, so as to extrude the air in the air bag 7 into the air cavity 5, and then the air can be sent into the air channel 401 through the air pipe 6, so as to jack the plug plate 404 in the clamping cavity 402, push the clamping rod 405 out of the clamping cavity 402, so that the clamping rod 405 can be clamped with the sliding plate 304 through the clamping hole 305, so as to limit the clamping plate, so as to avoid loose fixation of the article caused by the movement of the sliding plate 304 when the sliding plate is carried, and when the sliding plate 304, because the article is not placed, the plug plate 404 can retract the clamping rod into the clamping spring 403, so as not to affect the movement of the sliding plate 304.

Referring to fig. 1 to 3 and 5 to 8, a pressure plate 9 is embedded and connected in an air cavity 5, a pressure rod 10 is fixedly connected below the pressure plate 9, a backing plate 11 is fixedly connected below the pressure rod 10, an anti-skid pad 12 is fixedly connected below the backing plate 11, a return spring 13 is symmetrically and fixedly connected on the upper surface of the backing plate 11, the backing plate 11 is elastically connected with a chassis 1 through the return spring 13, electromagnetic blocks 14 are symmetrically arranged on the front side and the rear side of the pressure rod 10, the electromagnetic blocks 14 are fixedly connected with the chassis 1, fixing assemblies 15 are symmetrically arranged on the front side and the rear side of an expansion assembly 3, each fixing assembly 15 comprises a bottom plate 1501, a sliding frame 1502 and a guide rail 1503, one side of the sliding plate 304, which is far away from the chassis 1, is rotatably connected with a bottom plate 1501, the lower portion of one side of the bottom plate 1501, which is near the sliding plate 304, is symmetrically and fixedly connected with a sliding frame 1502, a guide rail 1503 is arranged on the surface of the sliding frame 1502, and the guide rail is arc-shaped, the push rod 309 is slidably connected with the sliding frame 1502 through a guide rail 1503, the fixing assembly 15 further comprises a buffer spring 1504, a buffer rod 1505 and a clamping plate 1506, the upper surface of the bottom plate 1501 is fixedly connected with the buffer spring 1504, the inner side of the buffer spring 1504 is provided with the buffer rod 1505, the upper end of the buffer spring 1504 is fixedly connected with the clamping plate 1506, the clamping plate 1506 is elastically connected with the bottom plate 1501 through the buffer spring 1504, two ends of the buffer rod 1505 are respectively fixedly connected with the bottom plate 1501 and the clamping plate 1506, the front side and the rear side of the upper surface of the chassis 1 are symmetrically and fixedly connected with baffle plates 16, the right side of the chassis 1 is fixedly connected with a pull handle 17, the pull handle 17 is provided with a switch 18, the right part of the chassis 1 is provided with a storage cavity 19, a storage battery 20 is placed in the storage cavity 19, the right side of the storage cavity 19 is rotatably connected with a cover plate 21, a magnet 22 is arranged below the storage cavity 19, and the switch 18 is connected with the storage battery 20 and the electromagnet 22 through a circuit;

the operation is as follows, when placing articles, the air in the air bag 7 can enter the sliding cavity 306 from the air pipe 6, so that the piston 307 moves in the sliding cavity 306, the connecting rod 308 drives the ejector rod 309 to slide in the sliding frame 1502 through the guide rail 1503, and further drives the bottom plate 1501 to rotate on the sliding plate 304, so that the clamping plate 1506 fixes the articles, the buffer spring 1504 can buffer the clamping force to avoid damaging the package, after the air enters the air cavity 5, the pressing plate 9 can be pressed to descend in the air cavity 5, so that the cushion plate 11 is pressed down through the pressing plate 9, the non-slip mat 12 is pressed on the ground, the position of the flat car is fixed, the situation that the articles are placed and deflected due to the movement of the flat car when placing the articles, the articles are unbalanced and overturned is avoided, and when placing the articles, the cushion plate 11 can be under the action of the return spring 13 to fix the chassis 1, the flat car cannot be influenced to move, when the flat car is moved, the switch 18 is pressed down, the storage battery 20 can electrify the electromagnetic block 14, the cushion plate 11 is sucked up, the cushion plate 11 drives the anti-skid pad 12 to leave the ground, the fixing of the flat car is released, when the flat car jolts, the air bag 7, the bearing spring 312 and the buffer spring 1504 can provide buffer for objects, the top plate 8 and the bearing plate 313 can be always kept parallel and level, the objects are prevented from inclining on the flat car, meanwhile, the objects can be prevented from falling or being damaged due to jolt, the baffle 16 can limit the objects and can be prevented from falling off when the flat car is in an up-down slope state, the cover plate 21 can seal the storage cavity 19 under the action of the magnet 22, the storage battery 20 is prevented from falling from the flat car, and when the storage battery 20 is replaced, the storage battery 20 can be taken out of the storage cavity 19 only by turning the cover plate 21.

In summary, in the flatbed with fixing effect, when articles are placed, firstly, the sliding plate 304 can be drawn out from the sliding groove 301 according to the size of the articles, so as to expand the bearing area of the flatbed, so that the articles can be stably placed on the flatbed, the articles can be prevented from overturning due to excessive articles exceeding the flatbed when the articles are placed, the sliding strip 303 can limit the sliding plate 304 through the sliding rail 302 before and after the sliding plate 304 moves, the sliding plate 304 is prevented from deflecting, the supporting rod can provide support for the sliding plate 304, after the articles are placed, the articles can press the top plate 8 down, so as to extrude the gas in the air bag 7 into the air cavity 5, and then send the gas into the air channel 401 through the gas pipe 6, so as to jack the plug plate 404 up in the clamping cavity 402, push the clamping rod 405 out of the clamping cavity 402, and enable the clamping rod 405 to be clamped with the sliding plate 304 through the clamping hole 305, so as to limit the clamping plate, when the sliding plate 304 is slid, because the sliding plate 304 is not used for placing articles, the plug plate 404 can take the clamping rod 405 into the clamping cavity 402 under the action of the clamp spring 403, the sliding plate 304 cannot be influenced to move, the gas in the air bag 7 can enter the sliding cavity 306 from the gas pipe 6, so that the piston 307 can move in the sliding cavity 306, the connecting rod 308 drives the ejector rod 309 to slide in the sliding frame 1502 through the guide rail 1503, and further drives the bottom plate 1501 to rotate on the sliding plate 304, so that the clamping plate 1506 can fix the articles, the buffer spring 1504 can buffer the clamping force, damage to packages is avoided, after the gas enters the air cavity 5, the pressing plate 9 can be pressed down in the air cavity 5, so that the base plate 11 is pressed down through the pressing plate 9, the anti-skid pad 12 is pressed on the ground, the position of the flat car is fixed, and the situation that the articles are placed and deflected due to the movement of the flat car when the articles are placed is avoided, when the flat car is moved, the switch 18 is pressed down, the storage battery 20 can be electrified to the electromagnetic block 14, so that the base plate 11 is sucked up, the base plate 11 drives the anti-slip pad 12 to leave the ground, the flat car is released from being fixed, when the flat car jolts, the air bag 7, the bearing spring 312 and the buffer spring 1504 can provide buffer for the goods, the top plate 8 and the bearing plate 313 can be always kept parallel and level, the goods are prevented from deflecting on the flat car, the goods can be prevented from dropping or being damaged due to jolt, the baffle 16 can limit the goods and prevent the goods from dropping on and off the slope, the cover plate 21 can seal the storage cavity 19 under the action of the magnet 22, the storage battery 20 is prevented from dropping from the flat car, and when the storage battery 20 is replaced, the storage battery 20 can be taken out of the storage cavity 19 only by turning the cover plate 21.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (10)

1. The utility model provides a flatbed with fixed effect, its characterized in that, includes chassis (1) and extension subassembly (3), chassis (1) below four corners fixedly connected with gyro wheel (2), extension subassembly (3) symmetry sets up both sides around chassis (1) upper portion, extension subassembly (3) include spout (301), slide rail (302), draw runner (303), slide (304), card hole (305), sliding chamber (306), piston (307), connecting rod (308) and ejector pin (309), spout (301) have been seted up to bilateral symmetry around chassis (1) upper portion, and spout (301) left and right sides bilateral symmetry has seted up slide rail (302), it is connected with draw runner (303) to embed in slide rail (302), and fixedly connected with slide (304) between draw runner (303), card hole (305) have been seted up to slide (304) lower surface, and seted up sliding chamber (306) in slide (304), sliding chamber (306) sliding connection has piston (307), and piston (307) one side fixedly connected with connecting rod (308), the one end fixedly connected with ejector pin (309) that piston (307) was kept away from to connecting rod (308).

2. The flat car with the fixing effect according to claim 1, wherein three sliding grooves (301) are respectively formed in the front side and the rear side of the chassis (1), the sliding plate (304) is slidably connected with the chassis (1) through the sliding grooves (301), the sliding plate (304) is E-shaped, the upper surface of the sliding plate (304) is flush with the upper surface of the chassis (1), and the clamping holes (305) are equidistantly distributed in the lower surface of the sliding plate (304).

3. The flat car with fixing effect according to claim 1, wherein the extension assembly (3) further comprises a support pillar (310), a ball (311), a bearing spring (312), a bearing plate (313) and a resistance rod (314), the support pillar (310) is symmetrically and fixedly connected below the sliding plate (304), the ball (311) is embedded and connected at the lower end of the support pillar (310), the bearing spring (312) is fixedly connected above the sliding plate (304), the bearing plate (313) is fixedly connected above the bearing spring (312), and the resistance rod (314) is arranged on the inner side of the bearing spring (312).

4. The flat car with the fixing effect according to claim 1, wherein the front side and the rear side of the lower portion of the chassis (1) are provided with limiting assemblies (4), each limiting assembly (4) comprises an air passage (401), a clamping cavity (402), a clamp spring (403), a plug plate (404) and a clamping rod (405), the front side and the rear side of the lower portion of the chassis (1) are provided with air passages (401), one end of each air passage (401) is provided with the clamping cavity (402), each air passage (401) is L-shaped, the clamp spring (403) is fixedly connected in the clamping cavity (402), the upper end of each clamp spring (403) is fixedly connected with the plug plate (404), the clamping rod (405) is fixedly connected above the plug plate (404), the clamping rod (405) is connected with the sliding plate (304) in a clamping mode through a clamping hole (305), the plug plate (404) is attached to the clamping cavity (402), and the plug plate (404) is connected with the clamping cavity (402) in a sliding mode.

5. The flat car with the fixing effect according to claim 1, wherein an air cavity (5) is formed in the middle of the upper surface of the chassis (1), air pipes (6) are symmetrically arranged on the front side and the rear side of the air cavity (5), an air bag (7) is arranged above the air cavity (5), a top plate (8) is fixedly connected above the air bag (7), the air pipes (6) are slidably connected with the sliding plate (304) through sliding cavities (306), the air pipes (6) are communicated with the clamping cavities (402) through air passages (401), and the upper surface of the top plate (8) is flush with the bearing plate (313).

6. The flat car with the fixing effect according to claim 5, wherein a pressing plate (9) is embedded and connected in the air cavity (5), a pressing rod (10) is fixedly connected below the pressing plate (9), a backing plate (11) is fixedly connected below the pressing rod (10), an anti-skid pad (12) is fixedly connected below the backing plate (11), a reset spring (13) is symmetrically and fixedly connected to the upper surface of the backing plate (11), the backing plate (11) is elastically connected with the chassis (1) through the reset spring (13), electromagnetic blocks (14) are symmetrically arranged on the front side and the rear side of the pressing rod (10), and the electromagnetic blocks (14) are fixedly connected with the chassis (1).

7. The flat car with the fixing effect according to claim 1, wherein the expansion assembly (3) is symmetrically provided with fixing assemblies (15) at the front side and the rear side, the fixing assemblies (15) comprise a bottom plate (1501), a sliding frame (1502) and a guide rail (1503), one side of the sliding plate (304) far away from the chassis (1) is rotatably connected with the bottom plate (1501), the lower part of one side of the bottom plate (1501) close to the sliding plate (304) is symmetrically and fixedly connected with the sliding frame (1502), the guide rail (1503) is arranged on the surface of the sliding frame (1502), the guide rail (1503) is arc-shaped, and the ejector rod (309) is slidably connected with the sliding frame (1502) through the guide rail (1503).

8. The flat car with the fixing effect as claimed in claim 7, wherein the fixing assembly (15) further comprises a buffer spring (1504), a buffer rod (1505) and a clamping plate (1506), the buffer spring (1504) is fixedly connected to the upper surface of the bottom plate (1501), the buffer rod (1505) is arranged on the inner side of the buffer spring (1504), the clamping plate (1506) is fixedly connected to the upper end of the buffer spring (1504), the clamping plate (1506) is elastically connected to the bottom plate (1501) through the buffer spring (1504), and two ends of the buffer rod (1505) are respectively fixedly connected to the bottom plate (1501) and the clamping plate (1506).

9. The flat car with the fixing effect according to claim 1, wherein the front and rear sides of the upper surface of the chassis (1) are symmetrically and fixedly connected with baffle plates (16), a pull handle (17) is fixedly connected to the right side of the chassis (1), a switch (18) is arranged on the pull handle (17), and a storage cavity (19) is formed in the right part of the chassis (1).

10. Flatbed with immobilization effect according to claim 9, characterized in that a battery (20) is placed in the storage chamber (19), and a cover plate (21) is rotatably connected to the right of the storage chamber (19), a magnet (22) is arranged below the storage chamber (19), and the switch (18) is connected to the battery (20) and the electromagnet (22) through a circuit.

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