CN214985492U - Flat-plate cart - Google Patents

Abstract

The utility model discloses a flat-plate cart, which comprises a supporting plate and a pushing handle; two sides of the bottom of the supporting plate are symmetrically provided with a guide rail respectively; the pushing handle comprises a pushing part and two fixing parts which are respectively hinged to two ends of the pushing part; two ends of the pushing part and the two fixing parts are respectively and correspondingly arranged on the guide rail in a front-back sliding manner; the bottom of the supporting plate is also provided with two positioning blocks which are respectively used for limiting the two fixing parts; when the pushing portion is pulled outwards until the positioning block is limited to the fixing portion, the pushing portion extends out of the supporting plate. The utility model has the advantages of simple and reasonable structure, convenient to use, the pushing hands can conveniently be accomodate in the bottom of backup pad, and is not fragile, and can reduce dull and stereotyped shallow's volume, is favorable to accomodating and transporting.

Description

Flat-plate cart

Technical Field

The utility model relates to a transportation equipment technical field specifically is to relate to a flat-plate trolley.

Background

The flat-plate cart is a small material conveying device, is widely applied in production and life, has low manufacturing cost, simple maintenance, convenient operation and light dead weight, can work in places where motor vehicles are inconvenient to use, and is very convenient for carrying articles in short distance. Due to its convenience, it is widely used for short-distance transportation in warehouses, manufacturing plants, department stores, logistics centers, freight stations or distribution.

The existing flat-bed cart generally comprises a supporting plate, and a pushing handle and a caster which are respectively connected to the supporting plate. However, the existing pushing hands are generally fixedly connected to one side of the supporting plate and cannot be stored, so that the whole size of the flat-plate cart is large, and the flat-plate cart is not beneficial to storage and transportation.

SUMMERY OF THE UTILITY MODEL

To the problem that prior art exists above, the utility model aims at providing a flat-plate trolley, its simple structure is reasonable, convenient to use, the pushing hands can conveniently be accomodate in the bottom of backup pad, and is not fragile, and can reduce flat-plate trolley's volume, is favorable to accomodating and transporting.

In order to realize the purpose, the technical scheme of the utility model is that:

a flat-plate cart comprises a supporting plate and a push handle, wherein two sides of the bottom of the supporting plate are symmetrically provided with a guide rail respectively; the pushing handle comprises a pushing part and two fixing parts which are respectively hinged to two ends of the pushing part; two ends of the pushing part and the two fixing parts are respectively and correspondingly arranged on the guide rail in a front-back sliding manner; the bottom of the supporting plate is also provided with two positioning blocks which are respectively used for limiting the two fixing parts; when the pushing portion is pulled outwards until the positioning block is limited to the fixing portion, the pushing portion extends out of the supporting plate.

For the additional structure of the above technical scheme, the following scheme is also included:

as a specific embodiment, each guide rail comprises a connecting part used for being connected with the supporting plate and a T-shaped limiting part arranged at the lower end of the connecting part; the two ends of the pushing part and the two fixing parts are respectively provided with a T-shaped limiting groove which is correspondingly sleeved on the limiting part.

As a specific embodiment, two ends of the pushing part are respectively provided with an inserting block; the front ends of the two fixing parts are respectively provided with a slot matched with the insertion block; the plug block with the both sides of slot are equipped with the jack that corresponds each other respectively, and be in install the bolt horizontally in the jack, so that the plug block with the fixed part is articulated.

As a specific embodiment, the flat-bed cart further comprises at least two caster folding assemblies; two fixing pipes extending forwards and backwards are symmetrically arranged at the bottom of the supporting plate, and a sliding pipe capable of sliding along the length direction of the fixing pipes is respectively arranged in the two fixing pipes; the caster wheel folding assemblies are correspondingly arranged on the two fixed tubes and the two sliding tubes; the two positioning blocks are respectively arranged at the front ends of the two sliding pipes and are respectively matched with the two caster wheel folding assemblies and the push handle.

Furthermore, each caster folding assembly comprises a caster fixing seat which is rotatably sleeved on the fixed pipe, a caster which is connected to one side of the caster fixing seat and a bolt which is fixed on the outer wall of the sliding pipe; a first strip-shaped hole for the bolt to move back and forth is formed in the fixed pipe; an arc-shaped track used for guiding the caster fixing seat is arranged inside the caster fixing seat, and the bolt is inserted into the arc-shaped track; an opening positioning groove and a folding positioning groove are respectively arranged at the two ends of the arc-shaped track; when the pushing handle is pulled outwards, the pushing handle drives the positioning block to move forwards, the bolt is synchronously driven to move from back to front along the arc-shaped track, and when the bolt is embedded into the opening positioning groove, the caster is converted from a folding state to an opening state; when the pushing handle is pushed inwards, the pushing handle drives the positioning block to move backwards, the bolt is driven to move forwards and backwards along the arc-shaped track synchronously, and when the bolt is embedded into the folding positioning groove, the truckle is turned into a folding state from an opening state.

Furthermore, a front positioning frame strip is arranged on the front side of the supporting plate; the front positioning frame strip is provided with a positioning strip hole, the push handle penetrates through the positioning strip hole in a matching manner, and the front positioning frame strip is used for blocking the positioning block tightly.

Furthermore, two sides of the front end of each positioning block are respectively provided with a step; the front end of the positioning block can be inserted into the positioning strip-shaped hole, and the positioning block can be clamped with the front positioning frame strip through the two steps.

Furthermore, the caster fixing seat comprises an inner fixing seat and an outer fixing seat; the inner fixed seat is sleeved on the outer wall of the fixed pipe; the front end of the inner fixed seat is provided with a first arc-shaped surface extending from back to front, and the rear end of the first arc-shaped surface is connected with the folding positioning groove; the outer fixing seat is sleeved on the inner fixing seat and the fixing pipe in a matching manner, and the caster wheel is connected to one side of the outer fixing seat; a second arc-shaped surface which is matched with the first arc-shaped surface and extends from back to front is arranged in the outer fixed seat, and the front end of the second arc-shaped surface is connected with the opening positioning groove; the arc-shaped track is formed between the first arc-shaped surface and the second arc-shaped surface.

Furthermore, each caster folding assembly also comprises a guide locking assembly which is arranged behind the caster fixing seat and matched with the caster fixing seat; the outer walls of the two sides of the inner fixed seat are respectively provided with a locking block, and each locking block is respectively provided with a locking groove with an opening at the rear end; the guide locking assembly comprises a guide rod arranged on the sliding pipe and a guide piece fixedly sleeved on the fixed pipe; two ends of the guide rod respectively penetrate through the sliding pipe, and a second strip-shaped hole for the two ends of the guide rod to move back and forth is formed in the fixed pipe; a guide strip-shaped hole penetrating through the front end and the rear end of the guide piece is formed in the guide piece, and the two ends of the guide rod are positioned in the guide strip-shaped hole; when the caster is in an open state, two ends of the guide rod are correspondingly embedded into the two locking grooves.

As a specific embodiment, a positioning pin is arranged on the inner side edge of each fixing part; a clamping positioning groove matched with the positioning pin is formed in the outer side edge of each positioning block; two sides of each clamping positioning groove are respectively provided with a positioning bead which is arranged oppositely, and a gap for the positioning pin to pass through is reserved between the two positioning beads; the positioning block and the positioning pin can be clamped or separated by pulling or pushing the push handle.

The utility model has the advantages that:

the utility model has the advantages of simple and reasonable structure, convenient to use, the bottom in the backup pad can conveniently be accomodate to the pushing hands, and is not fragile, and can reduce dull and stereotyped shallow's volume, is favorable to accomodating and transporting. When the push platform cart is used, the two ends of the push portion and the two fixing portions are respectively installed on the two guide rails, when the flat panel cart needs to be pulled, the push portion only needs to be pulled outwards to be separated from the guide rails outwards and extend out of the supporting plate, the positioning block is limited to the fixing portions, and therefore the push portion can be hinged to the fixing portions and can be turned over outside the supporting plate up and down, and angle adjustment is facilitated for people according to use habits.

(II) the utility model discloses a set up folding truckle and can further reduce the volume of flat-bed handcart, more be favorable to accomodating and transporting.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention in a folded state;

fig. 2 is a schematic view of the overall structure of the utility model in a folded state;

fig. 3 is a partial structural diagram of the first embodiment of the present invention;

fig. 4 is a schematic view of a partial structure of the present invention;

fig. 5 is a schematic view of a partial structure of the present invention;

FIG. 6 is a schematic view of the caster mount and the plug of the present invention;

fig. 7 is a schematic structural view of the caster fixing base of the present invention;

fig. 8 is a schematic structural view of the guiding locking assembly of the present invention;

fig. 9 is a schematic view of the overall structure of the present invention in an open state;

fig. 10 is a schematic view of the overall structure of the present invention in an open state.

Reference numerals:

1. a support plate; 101. a front positioning frame strip; 1011. positioning the strip-shaped holes; 102. a left positioning frame strip; 103. a right positioning frame strip; 104. a rear positioning frame strip; 2. a pushing handle; 21. a pushing part; 211. inserting a block; 22. a fixed part; 221. a slot; 222. positioning pins; 23. a limiting groove; 3. a guide rail; 31. a connecting portion; 32. a limiting part; 4. positioning blocks; 41. a step; 42. clamping the positioning groove; 43. a positioning bead; 5. a fixed tube; 51. a first bar-shaped hole; 52. a second bar-shaped hole; 6. a sliding tube; 7. a caster fixing seat; 71. an arc-shaped track; 72. opening the positioning groove; 73. folding the positioning groove; 74. an inner fixed seat; 741. a first arc-shaped surface; 742. a locking block; 743. a locking groove; 75. an outer fixed seat; 751. a second arcuate surface; 752. a bayonet; 8. a guide locking assembly; 81. a guide bar; 82. a guide member; 821. a guide strip-shaped hole; 9. a bolt; 10. a caster wheel; 11. a spring.

Detailed Description

The invention will be further elucidated with reference to the drawings and the embodiments, which are exemplary only and do not limit the scope of the invention.

As shown in fig. 1-10, a flat-bed cart comprises a support plate 1 and a push handle 2; two sides of the bottom of the supporting plate 1 are symmetrically provided with a guide rail 3 respectively; the pushing handle 2 comprises a pushing part 21 and two fixing parts 22 respectively hinged at two ends of the pushing part 21; two ends of the pushing part 21 and the two fixing parts 22 are respectively and correspondingly arranged on the two guide rails 3 in a front-back sliding manner; the bottom of the supporting plate 1 is also provided with two positioning blocks 4 which are respectively used for limiting the two fixing parts 22; when the pushing portion 21 is pulled outward until the positioning block 4 limits the fixing portion 22, the pushing portion 21 extends out of the supporting plate 1. Preferably, the pushing portion 21 has a shape of "". The utility model has the advantages of simple and reasonable structure, convenient to use, pushing hands 2 can conveniently accomodate in the bottom of backup pad 1, and is not fragile, and can reduce dull and stereotyped shallow's volume, is favorable to accomodating and transporting. When using, the both ends of promotion portion 21 and two fixed parts 22 are installed respectively on two guide rails 3, when needs pulling the pallet truck, only need outwards stimulate pushing hands 2, make promotion portion 21 outwards break away from guide rail 3 and stretch out backup pad 1, and locating piece 4 is spacing to fixed part 22, just so can utilize the articulated of promotion portion 21 and fixed part 22 and make promotion portion 21 can overturn from top to bottom outside backup pad 1, make things convenient for people according to use custom angle of adjustment.

As shown in fig. 3, each guide rail 3 includes a connecting portion 31 for connecting with the support plate 1 and a T-shaped limiting portion 32 disposed at a lower end of the connecting portion 31; two ends of the pushing portion 21 and the two fixing portions 22 are respectively provided with a T-shaped limiting groove 23 which is correspondingly sleeved on the limiting portion 32. Through the arrangement, the pushing handle 2 can stably slide on the guide rail 3, and the pushing handle 2 and the guide rail 3 are prevented from loosening. Of course, the shape of the limiting portion 32 and the limiting groove 23 may be set to other shapes, for example, an arch portion may be set on the limiting portion 32 and the limiting groove 23, so as to further increase the stability of the pushing handle 2 when sliding.

As shown in fig. 3, an insertion block 211 is respectively provided at both ends of the pushing portion 21; the front ends of the two fixing parts 22 are respectively provided with a slot 221 matched with the inserting block 211; insertion holes corresponding to each other are respectively formed at both sides of the insertion block 211 and the insertion groove 221, and bolts are horizontally installed in the insertion holes to hinge the insertion block 211 to the fixing portion 22. Through the arrangement, the pushing part 21 and the fixing part 22 can be stably hinged, and the structure is stable. However, it should be understood by those skilled in the art that the pushing portion 21 and the fixing portion 22 may be hinged by a hinge, such as a hinge.

As shown in fig. 2 and 3, the flat-bed cart further comprises at least two caster folding assemblies; two fixing tubes 5 extending back and forth are symmetrically arranged at the bottom of the supporting plate 1, and a sliding tube 6 capable of sliding along the length direction of the fixing tubes 5 is respectively arranged in the two fixing tubes 5; the caster wheel folding components are correspondingly arranged on the two fixed tubes 5 and the two sliding tubes 6; the two positioning blocks 4 are respectively installed at the front ends of the two sliding pipes 6, and the two positioning blocks 4 are respectively matched with the two caster wheel folding assemblies and the push handle 2. In this embodiment, the caster wheel folding assembly is provided with four evenly distributed.

As shown in fig. 5-7, each caster folding assembly comprises a caster fixing seat 7 rotatably sleeved on the fixed tube 5, a caster 10 connected to one side of the caster fixing seat 7, and a plug pin 9 fixed on the outer wall of the sliding tube 6; a first strip-shaped hole 51 for the bolt 9 to move back and forth is arranged on the fixed pipe 5; an arc-shaped track 71 for guiding the caster fixing seat 7 is arranged inside the caster fixing seat 7, and the bolt 9 is inserted into the arc-shaped track 71; an opening positioning groove 72 and a folding positioning groove 73 are respectively arranged at the two ends of the arc-shaped track 71; when the pushing handle 2 is pulled outwards, the pushing handle 2 drives the positioning block 4 to move forwards, the bolt 9 is synchronously driven to move forwards from back along the arc-shaped track 71, and when the bolt 9 is embedded into the opening positioning groove 72, the caster 10 is converted into an opening state from a folding state; when the pushing handle 2 is pushed inward, the pushing handle 2 drives the positioning block 4 to move backward, the bolt 9 is synchronously driven to move forward and backward along the arc-shaped track 71, and when the bolt 9 is inserted into the folding positioning groove 73, the caster 10 is changed from the unfolded state to the folded state. Through the arrangement, the trundles 10 can be synchronously switched between the folding state and the unfolding state when the push handle 2 is pulled or pushed, so that the use is convenient, and the operation mode is simple and quick. Preferably, as shown in fig. 6, the bolts 9 are symmetrically disposed, and the arc-shaped rail 71, the opening positioning groove 72 and the folding positioning groove 73 are also respectively disposed with two bolts 9 correspondingly engaged with each other, so that the rotation stability of the caster fixing base 7 can be improved, and the caster fixing base 7 is not easily damaged.

As shown in fig. 2, a front positioning frame strip 101 is further disposed on the front side of the support plate 1; a positioning strip-shaped hole 1011 is arranged on the front positioning frame strip 101, the pushing handle 2 is arranged in the positioning strip-shaped hole 1011 in a penetrating manner in a matching manner, and the front positioning frame strip 101 is used for blocking and fastening the positioning block 4.

As shown in fig. 4, two sides of the front end of each positioning block 4 are respectively provided with a step 41; the front end of the positioning block 4 can be inserted into the positioning strip-shaped hole 1011, and the positioning block 4 can be fastened with the front positioning frame strip 101 through two steps 41. Can conveniently keep off tight locating piece 4 through above setting to prevent that push handle 2 from deviating from guide rail 3, when using, after push handle 2 drives the front end of locating piece 41 and wears to establish in location bar hole 1011, two steps 41 also support tightly in the front on locating frame strip 101 correspondingly to let push handle 2 accomplish the screens.

As shown in fig. 5-7, the caster mount 7 includes an inner mount 74 and an outer mount 75; the inner fixed seat 74 is sleeved on the outer wall of the fixed pipe 5; a first arc-shaped surface 741 extending from back to front is arranged at the front end of the inner fixed seat 74, and the rear end of the first arc-shaped surface 741 is connected with a folding positioning groove 73; the outer fixing seat 75 is fittingly sleeved on the inner fixing seat 74 and the fixing tube 5, the caster 10 is connected to one side of the outer fixing seat 75, and specifically, the outer fixing seat 75 and the inner fixing seat 74 are mutually clamped through a clamping block and a clamping groove so as to move synchronously; a second arc-shaped surface 751 which is matched with the first arc-shaped surface 741 and extends from back to front is arranged inside the outer fixed seat 75, and the front end of the second arc-shaped surface 751 is connected with the opening positioning groove 72; the first arc-shaped surface 741 and the second arc-shaped surface 751 form an arc-shaped rail 71 therebetween. Can make things convenient for production and dismouting truckle fixing base 7 and bolt 9 through above setting, also can let bolt 9 conveniently remove.

As shown in fig. 4, 5 and 8, each caster folding assembly further includes a guiding locking assembly 8 disposed behind the caster fixing base 7 and engaged with the caster fixing base 7; the outer walls of the two sides of the inner fixed seat 74 are respectively provided with a locking block 742, and each locking block 742 is respectively provided with a locking groove 743 with an opening at the rear end; the guiding locking assembly 8 comprises a guiding rod 81 arranged on the sliding pipe 6 and a guiding piece 82 fixedly sleeved on the fixed pipe 5; two ends of the guide rod 81 respectively penetrate outside the sliding tube 6, and a second strip-shaped hole 52 for the two ends of the guide rod 81 to move back and forth is arranged on the fixed tube 5; a guide strip hole 821 penetrating through the front end and the rear end of the guide 82 is arranged in the guide 82, and the two ends of the guide rod 81 are positioned in the guide strip hole 821; when the caster 10 is in the open state, the two ends of the guide rod 81 are correspondingly inserted into the two locking grooves 743. The caster 10 can be conveniently kept in an open state by arranging the guide locking assembly 8, and the caster 10 is prevented from loosening.

Preferably, in order to allow the guide rod 81 to be more smoothly inserted into the locking slot 743, the side surface of the guide rod 81 facing the locking slot 743 is a convex arc surface, that is, the guide rod 81 is a D-shaped rod.

As shown in fig. 5, in order to facilitate the connection between the inner fixing seat 74 and the outer fixing seat 75, a bayonet 752 engaged with the locking block 742 is disposed at the lower end of the outer fixing seat 75, and the bayonet 752 is engaged with the locking block 742 to improve the stability between the inner fixing seat 74 and the outer fixing seat 75.

As shown in fig. 2 and 4, a positioning pin 222 is provided on an inner side edge of each fixing portion 22; a clamping positioning groove 42 matched with the positioning pin 222 is arranged on the outer side edge of each positioning block 4; two sides of each clamping positioning groove 42 are respectively provided with a positioning bead 43 which is arranged oppositely, and a gap for the positioning pin 222 to pass through is reserved between the two positioning beads 43; the positioning block 4 can be clamped or separated from the positioning pin 222 by pulling or pushing the push handle 2. The fixing part 22 can conveniently drive the positioning block 4 to move through the arrangement, and the arrangement mode can conveniently realize the clamping or separating of the positioning block 4 and the positioning pin 222; meanwhile, the two positioning beads 43 can limit the position of the positioning pin 222 to prevent the position from being separated. Since the positioning beads 43 are prior art, they will not be described in detail herein.

In the present embodiment, as shown in fig. 2, a left positioning frame strip 102, a right positioning frame strip 103 and a rear positioning frame strip 104 are respectively disposed on the left side, the right side and the rear side of the support plate 1; the front positioning frame strip 101, the left positioning frame strip 102, the right positioning frame strip 103 and the rear positioning frame strip 104 are connected in sequence to form a structural reinforcing frame. The structure of the support plate 1 can be reinforced by the above arrangement, making it more durable.

As shown in fig. 4 and 5, a spring 11 sleeved on the fixed pipe 5 is further installed at the front end of the outer fixed seat 75, one end of the spring 11 abuts against a fixed member fixedly installed on the fixed pipe 5, and the other end abuts against the outer fixed seat 75. In this embodiment, two springs 11 are provided, and the two springs 11 are respectively installed at the front ends of the two outer fixing seats 75 near the two positioning blocks 4. Can let truckle 10 utilize spring 11 to support tight truckle fixing base 7 and utilize spring 11's extension power and make truckle fixing base 7 comparatively stable when using through setting up spring 11 to improve truckle 10's stability, simultaneously, spring 11 also can play partial cushioning effect to a certain extent.

With reference to fig. 9 and 10, the following describes the usage principle of the present invention for understanding the present invention:

first, the flatbed cart is folded as shown in fig. 1 and 2. When the door needs to be opened, the pushing part 21 is pulled, so that the pushing part 21 penetrates through the positioning strip-shaped hole 1011 outwards; when the positioning pins 222 on the two fixing portions 22 move to the preset positions and penetrate through the two positioning beads 43 to be inserted into the two clamping positioning grooves 42, the two positioning blocks 4 move forwards along with the fixing portions 22; when the two positioning blocks 4 move, the two sliding pipes 6, the bolts 9 on the sliding pipes 6 and the guide rods 81 are driven to move forwards, the bolts 9 move forwards along the arc-shaped rails 71 after being separated from the folding positioning grooves 73, and the bolts 9 can only move in the front-back direction, so that the caster fixing seats 7 can be driven to be changed from a horizontal state to a vertical state when moving, and the caster 10 is synchronously driven to be changed from a folding state to an opening state; when the plug 9 is inserted into the opening positioning groove 72, the opening of the caster 10 is completed, one side of the guide rod 81 just penetrates through the guide strip-shaped hole 821 and is inserted into the locking groove 743, meanwhile, the front end of the positioning block 4 is just inserted into the positioning strip-shaped hole 1011 and abuts against the front positioning frame strip 101 by using the step 41, the pushing part 21 is just separated from the guide rail 3 and extends out of the supporting plate 1, and people can freely turn over the pushing part 21 for use; the opening of the flat bed cart is completed through the above steps, and the opened state of the flat bed cart is shown in fig. 9 and 10.

When the folding is needed, the pushing part 21 is turned over to be horizontal to the fixing part 22, then the pushing handle 2 is pushed backwards into the positioning strip-shaped hole 1011, and in the moving process, the positioning pin 222 penetrates out of the two positioning beads 43 and then is separated from the clamping positioning groove 42; when the front end of the pushing part 21 enters the positioning strip-shaped hole 1011, the pushing part contacts the two positioning blocks 4 and pushes the two positioning blocks 4 to move backwards, so that the two sliding tubes 6 and the bolts 9 and the guide rods 81 on the sliding tubes 6 are driven to move backwards, the bolts 9 are separated from the opening positioning grooves 72, the guide rods 81 are separated from the clamping positioning grooves 42 and then move along the guiding strip-shaped holes 821, the bolts 9 move backwards along the arc-shaped rails 71, so that the caster fixing seat 7 is enabled to be changed from a vertical state to a horizontal state, and the caster 10 is synchronously driven to be changed from an opening state to a folding state; when the plug 9 is inserted into the folding positioning groove 73, the caster 10 is folded, the positioning block 4 is separated from the front positioning frame strip 101, and the front end of the pushing part 21 is correspondingly embedded into the positioning strip-shaped hole 1011; the folding of the flat-bed cart is completed through the above steps, and the folding state of the flat-bed cart is shown in fig. 1 and 2.

In summary, the utility model is provided with the pushing handle which can be stored at the bottom of the supporting plate 1 and the caster 10 which can be folded, thereby greatly reducing the volume of the flat-plate cart and being beneficial to storage and transportation; and simultaneously, the utility model discloses an operation mode is very simple and convenient, is favorable to using.

The present invention is not limited to the above embodiment, and if various modifications or variations of the present invention do not depart from the spirit and scope of the present invention, they are intended to be covered if they fall within the scope of the claims and the equivalent technology of the present invention.

Claims (10)

1. The utility model provides a flat-plate trolley, including backup pad and pushing hands, its characterized in that:

two sides of the bottom of the supporting plate are symmetrically provided with a guide rail respectively; the pushing handle comprises a pushing part and two fixing parts which are respectively hinged to two ends of the pushing part; two ends of the pushing part and the two fixing parts are respectively and correspondingly arranged on the guide rail in a front-back sliding manner; the bottom of the supporting plate is also provided with two positioning blocks which are respectively used for limiting the two fixing parts; when the pushing portion is pulled outwards until the positioning block is limited to the fixing portion, the pushing portion extends out of the supporting plate.

2. The flat cart of claim 1, wherein:

each guide rail comprises a connecting part used for being connected with the supporting plate and a T-shaped limiting part arranged at the lower end of the connecting part; the two ends of the pushing part and the two fixing parts are respectively provided with a T-shaped limiting groove which is correspondingly sleeved on the limiting part.

3. The flat cart of claim 1, wherein:

two ends of the pushing part are respectively provided with an inserting block; the front ends of the two fixing parts are respectively provided with a slot matched with the insertion block; the plug block with the both sides of slot are equipped with the jack that corresponds each other respectively, and be in install the bolt horizontally in the jack, so that the plug block with the fixed part is articulated.

4. The flat cart of claim 1, wherein:

the flat-bed cart also comprises at least two caster wheel folding components; two fixing pipes extending forwards and backwards are symmetrically arranged at the bottom of the supporting plate, and a sliding pipe capable of sliding along the length direction of the fixing pipes is respectively arranged in the two fixing pipes; the caster wheel folding assemblies are correspondingly arranged on the two fixed tubes and the two sliding tubes; the two positioning blocks are respectively arranged at the front ends of the two sliding pipes and are respectively matched with the two caster wheel folding assemblies and the push handle.

5. The flat cart of claim 4, wherein:

each caster folding assembly comprises a caster fixing seat which is rotatably sleeved on the fixed pipe, a caster which is connected to one side of the caster fixing seat and a bolt which is fixed on the outer wall of the sliding pipe; a first strip-shaped hole for the bolt to move back and forth is formed in the fixed pipe; an arc-shaped track used for guiding the caster fixing seat is arranged inside the caster fixing seat, and the bolt is inserted into the arc-shaped track; an opening positioning groove and a folding positioning groove are respectively arranged at the two ends of the arc-shaped track; when the pushing handle is pulled outwards, the pushing handle drives the positioning block to move forwards, the bolt is synchronously driven to move from back to front along the arc-shaped track, and when the bolt is embedded into the opening positioning groove, the caster is converted from a folding state to an opening state; when the pushing handle is pushed inwards, the pushing handle drives the positioning block to move backwards, the bolt is driven to move forwards and backwards along the arc-shaped track synchronously, and when the bolt is embedded into the folding positioning groove, the truckle is turned into a folding state from an opening state.

6. The flat cart of claim 5, wherein:

a front positioning frame strip is arranged on the front side of the supporting plate; the front positioning frame strip is provided with a positioning strip hole, the push handle penetrates through the positioning strip hole in a matching manner, and the front positioning frame strip is used for blocking the positioning block tightly.

7. The flat cart of claim 6, wherein:

two sides of the front end of each positioning block are respectively provided with a step; the front end of the positioning block can be inserted into the positioning strip-shaped hole, and the positioning block can be clamped with the front positioning frame strip through the two steps.

8. The flat cart of claim 5, wherein:

the caster fixing seat comprises an inner fixing seat and an outer fixing seat; the inner fixed seat is sleeved on the outer wall of the fixed pipe; the front end of the inner fixed seat is provided with a first arc-shaped surface extending from back to front, and the rear end of the first arc-shaped surface is connected with the folding positioning groove; the outer fixing seat is sleeved on the inner fixing seat and the fixing pipe in a matching manner, and the caster wheel is connected to one side of the outer fixing seat; a second arc-shaped surface which is matched with the first arc-shaped surface and extends from back to front is arranged in the outer fixed seat, and the front end of the second arc-shaped surface is connected with the opening positioning groove; the arc-shaped track is formed between the first arc-shaped surface and the second arc-shaped surface.

9. The flat cart of claim 8, wherein:

each caster folding assembly also comprises a guide locking assembly which is arranged behind the caster fixing seat and matched with the caster fixing seat; the outer walls of the two sides of the inner fixed seat are respectively provided with a locking block, and each locking block is respectively provided with a locking groove with an opening at the rear end; the guide locking assembly comprises a guide rod arranged on the sliding pipe and a guide piece fixedly sleeved on the fixed pipe; two ends of the guide rod respectively penetrate through the sliding pipe, and a second strip-shaped hole for the two ends of the guide rod to move back and forth is formed in the fixed pipe; a guide strip-shaped hole penetrating through the front end and the rear end of the guide piece is formed in the guide piece, and the two ends of the guide rod are positioned in the guide strip-shaped hole; when the caster is in an open state, two ends of the guide rod are correspondingly embedded into the two locking grooves.

10. The flat cart of claim 1, wherein:

a positioning pin is arranged on the inner side edge of each fixing part; a clamping positioning groove matched with the positioning pin is formed in the outer side edge of each positioning block; two sides of each clamping positioning groove are respectively provided with a positioning bead which is arranged oppositely, and a gap for the positioning pin to pass through is reserved between the two positioning beads; the positioning block and the positioning pin can be clamped or separated by pulling or pushing the push handle.

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