CN214317240U - Suitcase convenient to change box - Google Patents

Abstract

The utility model relates to a suitcase technical field, concretely relates to suitcase convenient to change box, its characterized in that: the power distribution box comprises a box body, pull rod and supporting baseplate, the left and right sides of supporting baseplate all is equipped with the expansion board, the expansion board is connected with the supporting baseplate is mobilizable, both sides all are equipped with the mounting panel around the expansion board, the mounting panel lower extreme is connected with the universal wheel, the rear side of supporting baseplate is equipped with the lower support backplate, the lower support backplate is connected with the supporting baseplate is mobilizable, the lower support backplate upper end is equipped with the support backplate, go up the support backplate and be connected with the lower support backplate is mobilizable, be equipped with first locking mechanism on the lower support backplate, on the separable supporting baseplate of locating of box, be equipped with the sucking disc on the expansion board, terminal surface is equipped with the adsorption plate under the box, be equipped with joint mechanism between box and the last support backplate. The utility model has the advantages that the whole structure is novel, practical reliable, the convenience carries out quick assembly disassembly to the box, the box of removable different volumes size, the fine user demand who satisfies people of ability.

Description

Suitcase convenient to change box

Technical Field

The utility model relates to a suitcase technical field, specificly relate to a suitcase convenient to change box.

Background

The luggage case is a type of luggage, and is usually used for placing clothes, personal care products and souvenirs required in journey, and can be divided into a hard-shell luggage case and a soft-shell luggage case according to a shell, wherein the hard-shell luggage case is relatively resistant to falling and suitable for luggage needing more protection, and the soft-shell luggage case is generally lighter in weight and more elastic in capacity than the hard-shell luggage case.

When people go out to work, travel, need carry a certain amount of luggage usually, however, current people's family generally can only be equipped with a suitcase, nevertheless because current suitcase size is fixed usually, and go out the quantity of the luggage that need carry at every turn and be not necessary again for the unable fine demand that satisfies every time go out to carry the different quantity of luggage of this suitcase, and the box can't be dismantled, can't select and change the box of different volume sizes according to actual need, it is comparatively inconvenient in the use.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide an overall structure is novel, practical reliable, conveniently carries out quick assembly disassembly to the box, and the box of removable different volumes size, the suitcase of being convenient for change box of satisfying people's user demand that can be fine.

In order to solve the technical problem, the utility model discloses a technical scheme as follows: a luggage case convenient for replacing a case body, which comprises a case body, pull rod and supporting baseplate, supporting baseplate's the left and right sides all is equipped with the extension board, the extension board is connected with the supporting baseplate is mobilizable, both sides all are equipped with the mounting panel around the extension board, mounting panel lower extreme fixedly connected with universal wheel, supporting baseplate's rear side is equipped with the lower support backplate, the lower support backplate is connected with the supporting baseplate is mobilizable, the lower support backplate upper end is equipped with the support backplate, go up the support backplate and be connected with the lower support backplate is mobilizable, be equipped with the first locking mechanism that is used for playing locking fixed action to last support backplate on the lower support backplate, the pull rod is fixed to be located on the lower support backplate trailing flank, the box is detachable locates on the supporting baseplate, be equipped with at least one sucking disc that is used for adsorbing the box on the extension board, the fixed adsorption plate that is corresponding with the sucking disc that is equipped with of terminal surface under the box, still be equipped with clamping mechanism between box and the last support backplate.

Furthermore, a positioning block is fixedly arranged at the center of the upper end face of the supporting bottom plate, and a positioning groove matched with the positioning block is arranged on the lower end face of the box body.

Furthermore, a baffle is fixedly arranged on one side, far away from the supporting bottom plate, of the upper end surface of the expansion plate.

Furthermore, a first connecting plate is fixedly arranged on one side of the expansion plate, a first limiting groove is arranged on the first connecting plate, the left side surface and the right side surface of the supporting bottom plate are both inwards recessed and form a first connecting cavity penetrating through the lower end surface, the first connecting cavity is matched with the first connecting plate, a first limiting block matched with the first limiting groove is fixedly arranged in the first connecting cavity, the first connecting plate is movably inserted in the first connecting cavity and enables the first limiting block to be clamped in the first limiting groove, a first compression spring is further arranged in the first connecting cavity, one end of the first compression spring is abutted against the first limiting block, the other end of the first compression spring is abutted against the first connecting plate, a second connecting plate is fixedly arranged on one side of the lower supporting back plate, a second limiting groove is arranged on the second connecting plate, a second connecting cavity penetrating through the lower end surface is inwards recessed and formed on the rear side surface of the supporting bottom plate, and the second connecting cavity is matched with the second connecting plate, the second connecting cavity is fixedly provided with a second limiting block matched with the second limiting groove, the second connecting plate is movably inserted into the second connecting cavity and enables the second limiting block to be clamped in the second limiting groove, a second compression spring is further arranged in the second connecting cavity, one end of the second compression spring is abutted to the second limiting block, the other end of the second compression spring is abutted to the second connecting plate, and the lower end face of the supporting bottom plate is fixedly connected with a sealing plate used for covering the first connecting cavity and the second connecting cavity.

Furthermore, the first locking mechanism comprises a first knob bolt, a third connecting plate is fixedly arranged at the lower end of the upper support back plate, the upper end face of the lower support back plate is inwards sunken and is formed with a third connecting cavity, the third connecting plate is movably inserted into the third connecting cavity, a first threaded hole is formed in the lower support back plate, a plurality of first fixing holes are formed in the third connecting plate along the length direction of the third connecting plate at intervals, and the first knob bolt is in threaded connection with the first threaded hole and can be inserted into the corresponding first fixing hole.

Furthermore, a fourth connecting plate is fixedly arranged on one side of the mounting plate, the front side and the rear side of the expansion plate are both inwards sunken and are provided with fourth connecting cavities matched with the fourth connecting plate, the fourth connecting plate is movably inserted into the fourth connecting cavities, and a second locking mechanism used for locking and fixing the fourth connecting plate is further arranged at the lower end of the expansion plate.

Furthermore, the second locking mechanism comprises a second knob bolt, a second threaded hole is formed in the lower end of the expansion plate, a plurality of second fixing holes are formed in the fourth connecting plate along the length direction of the fourth connecting plate at intervals, and the second knob bolt is in threaded connection with the second threaded hole and can be inserted into the corresponding second fixing hole.

Furthermore, the clamping mechanism comprises a clamping block and a clamping groove, the clamping block is fixedly arranged on the upper supporting backboard, the clamping groove is arranged on the box body, and the clamping block is matched with the clamping groove and can be detachably clamped in the clamping groove.

Further, be equipped with 2 sucking discs on the expansion board, the sucking disc includes the sucking disc casing, the sucking disc colloid, press and detain and third compression spring, be equipped with the installation cavity with sucking disc casing looks adaptation on the expansion board, sucking disc casing fixed mounting is in the installation cavity, the fixed spliced pole that is equipped with in sucking disc colloid side surface center, be equipped with the connecting hole with spliced pole looks adaptation on the sucking disc casing, the sucking disc colloid is located to the sucking disc casing cover, the connecting hole is passed and is detained mutually with pressing to the one end of spliced pole articulated, press and detain and sucking disc casing looks butt, the external diameter of sucking disc colloid is greater than the external diameter of sucking disc casing, the third compression spring cover is located on the spliced pole, the one end and the sucking disc colloid looks butt and the other end and sucking disc casing looks butt of third compression spring.

Furthermore, the connecting column is in a cuboid shape.

According to the above description, the utility model provides a suitcase convenient to change box overall structure is novel, practical and reliable, through the setting of expansion board, can conveniently adjust the mounted position of expansion board to adjust the support range of supporting the backplate, through the setting of upper support backplate, can conveniently adjust the mounted position of upper support backplate, to adjust the support range of lower support backplate, thereby can be fine adapt to the use of the suitcase of different volume sizes; the stable connection between the upper support back plate and the lower support back plate can be well ensured through the arrangement of the first locking mechanism; through the arrangement of the suckers, the box body can be well adsorbed and fixed, and the box body is ensured to be stably supported on the supporting bottom plate; the sucker is simple to use and convenient to operate, so that the box body can be conveniently and quickly disassembled and assembled, a user can conveniently replace the box bodies with different sizes according to actual needs, and the use requirements of people can be well met; through the arrangement of the clamping mechanism, the stable connection between the box body and the upper support back plate can be effectively ensured, so that the stability of the whole structure of the luggage case is further ensured; through being set up mobilizable connection between mounting panel and the expansion board, simultaneously through second locking mechanism's setting, can conveniently adjust the position of mounting panel, thereby change the position of universal wheel, can play fine locking fixed action to the universal wheel simultaneously, ensure overall structure's stability, therefore, the use of the box of adaptation different size of volume that can be fine, in order to provide better support, and simultaneously, can conveniently increase the support range of this suitcase bottom, thereby when this suitcase is in the state of placing, be difficult for tumbling because of external force collision, effectively ensure the completeness of this suitcase.

Drawings

Fig. 1 is a schematic view showing a first usage state of the luggage case convenient for replacing the case body.

Fig. 2 is the utility model relates to a three-dimensional structure schematic diagram when shrouding is taken off to suitcase convenient to change box.

Fig. 3 is a partially enlarged schematic view of a portion a in fig. 2.

Fig. 4 is a partially enlarged schematic view of a portion B in fig. 2.

Fig. 5 is a partially enlarged schematic view of C in fig. 2.

Fig. 6 is a schematic structural view of the sucker.

Fig. 7 is a schematic perspective view of the suction cup housing.

Fig. 8 is a perspective view of the mounting plate.

Fig. 9 is a schematic perspective view of the case.

Fig. 10 is a schematic perspective view of the lower support back plate.

Fig. 11 is a schematic perspective view of the expansion board.

Fig. 12 is a schematic structural view of the latch mechanism.

Fig. 13 is a perspective view of the support base plate.

Fig. 14 is a schematic view of a second usage state of the luggage case with a case body convenient to replace according to the present invention.

Fig. 15 is an enlarged partial view of fig. 14 at D.

In the figure: 1-a box body; 11-an adsorption plate; 12-positioning grooves; 13-a handle; 2-a pull rod; 3-supporting the bottom plate; 31-a positioning block; 32-a first connection chamber; 33-a first stopper; 34-a second connecting cavity; 35-a second stop block; 4-an expansion board; 41-a baffle plate; 42-a first connection plate; 421-a first limit groove; 43-a fourth connecting chamber; 44-a mounting cavity; 5, mounting a plate; 51-a fourth connecting plate; 61-universal wheels; 62-a first compression spring; 63-a second compression spring; 64-closing plate; 65-a second locking mechanism; 651-second knob bolt; 652-second threaded hole; 653 — a second fixing hole; 71-a lower support back plate; 711-a second connecting plate; 712-a second limit groove; 713-a third connection chamber; 72-upper support backing plate; 721-a third connecting plate; 73-a first locking mechanism; 731-first knob bolt; 732-a first threaded hole; 733 — first fixing hole; 8-a sucker; 81-sucker housing; 811-connecting hole; 82-suction cup colloid; 83-pressing and buckling; 84-a third compression spring; 85-connecting column; 9-a clamping mechanism; 91-a fixture block; 92-card slot.

Detailed Description

The present invention will be further described with reference to the following detailed description.

As shown in fig. 1 to 15, the luggage case convenient for replacing the case body 1 of the present invention comprises a case body 1, a pull rod 2 and a supporting bottom plate 3, wherein the left and right sides of the supporting bottom plate 3 are respectively provided with an expansion plate 4, the expansion plate 4 is movably connected with the supporting bottom plate 3, the front and back sides of the expansion plate 4 are respectively provided with a mounting plate 5, the lower end of the mounting plate 5 is fixedly connected with a universal wheel 61, the rear side of the supporting bottom plate 3 is provided with a lower supporting back plate 71, the lower supporting back plate 71 is movably connected with the supporting bottom plate 3, the upper end of the lower supporting back plate 71 is provided with an upper supporting back plate 72, the upper supporting back plate 72 is movably connected with the lower supporting back plate 71, the lower supporting back plate 71 is provided with a first locking mechanism 73 for locking and fixing the upper supporting back plate 72, the pull rod 2 is fixedly arranged on the rear side surface of the lower supporting back plate 71, the box 1 is detachable to be located on the supporting baseplate 3, be equipped with at least one on the expansion plate 4 and be used for adsorbing the sucking disc 8 of box 1, the terminal surface is fixed be equipped with under the box 1 with the corresponding adsorption plate 11 of sucking disc 8, box 1 with it still is equipped with latch mechanism 9 to go up between the support backplate 72.

Through the arrangement of the expansion plate 4, the installation position of the expansion plate 4 can be conveniently adjusted to adjust the support range of the support bottom plate 3, and through the arrangement of the upper support back plate 72, the installation position of the upper support back plate 72 can be conveniently adjusted to adjust the support range of the lower support back plate 71, so that the suitcase with different sizes can be well adapted to use; by arranging the first locking mechanism 73, the stable connection between the upper support back plate 72 and the lower support back plate 71 can be well ensured; through the arrangement of the suckers 8, the box body 1 can be well adsorbed and fixed, and the box body 1 is ensured to be stably supported on the supporting bottom plate 3; the sucker 8 is simple to use and convenient to operate, so that the box body 1 can be conveniently and quickly disassembled and assembled, a user can conveniently replace the box bodies 1 with different sizes according to actual needs, and the use requirements of people can be well met; through the arrangement of the clamping mechanism 9, the stable connection between the box body 1 and the upper supporting back plate 72 can be effectively ensured, so that the stability of the whole structure of the luggage case is further ensured.

As shown in fig. 1, a handle 13 is further fixedly arranged at the upper end of the box body 1.

As shown in fig. 9 and 13, the fixed locating piece 31 that is equipped with in supporting baseplate 3 up end center, the terminal surface is equipped with under 1 of box with the constant head tank 12 of locating piece 31 looks adaptation, work as box 1 is placed when supporting baseplate 3 is last, locating piece 31 can block locate in the constant head tank 12, through adopting this structure, can be right box 1 is in the last mounted position of supporting baseplate 3 plays quick, accurate location effect, guarantees that sucking disc 8 is right box 1 lower extreme adsorption plate 11 carries out fine absorption fixedly.

As shown in fig. 1 and 11, a baffle plate 41 is further fixedly disposed on a side of the upper end surface of the expansion plate 4 away from the supporting bottom plate 3, and by the arrangement of the baffle plate 41, a certain limiting effect can be exerted on the side edge of the box body 1, so that the overall structure of the luggage case is more stable.

As shown in fig. 2, 4, 11 and 13, a first connecting plate 42 is fixedly disposed on one side of the expansion plate 4, a first limit groove 421 is disposed on the first connecting plate 42, the left and right side surfaces of the supporting base plate 3 are both recessed inward and form a first connecting cavity 32 penetrating through the lower end surface, the first connecting cavity 32 is adapted to the first connecting plate 42, a first limit block 33 adapted to the first limit groove 421 is fixedly disposed in the first connecting cavity 32, the first connecting plate 42 is movably inserted into the first connecting cavity 32 and enables the first limit block 33 to be clamped in the first limit groove 421, a first compression spring 62 is further disposed in the first connecting cavity 32, one end of the first compression spring 62 is abutted to the first limit block 33 and the other end is abutted to the first connecting plate 42, a second connecting plate 711 is fixedly disposed on one side of the back plate 71, a second limiting groove 712 is arranged on the second connecting plate 711, a second connecting cavity 34 penetrating through the lower end face is formed by the rear side surface of the supporting base plate 3 being recessed inwards, the second connecting cavity 34 is matched with the second connecting plate 711, a second limiting block 35 matched with the second limiting groove 712 is fixedly arranged in the second connecting cavity 34, the second connecting plate 711 is movably inserted into the second connecting cavity 34 and enables the second limiting block 35 to be clamped in the second limiting groove 712, a second compression spring 63 is further arranged in the second connecting cavity 34, one end of the second compression spring 63 is abutted against the second limiting block 35 and the other end of the second compression spring is abutted against the second connecting plate 711, a sealing plate 64 for covering the first connecting cavity 32 and the second connecting cavity 34 is further fixedly connected to the lower end face of the supporting base plate 3, and by adopting the structure, the installation positions of the expansion plate 4 and the lower supporting back plate 71 can be conveniently adjusted to be suitable for the use of the box body 1 with different sizes, and meanwhile, the whole structure is stable, practical and reliable.

As shown in fig. 3 and 10, the first locking mechanism 73 includes a first knob bolt 731, the lower end of the upper back support plate 72 is fixedly provided with a third connecting plate 721, the upper end surface of the lower back support plate 71 is recessed inwards and is formed with a third connecting cavity 713, the third connecting plate 721 is movably inserted into the third connecting cavity 713, the lower support back plate 71 is provided with a first screw hole 732, a plurality of first fixing holes 733 are formed at intervals in the third connecting plate 721 along the length direction thereof, the first knob bolt 731 is screwed into the first screw hole 732 and inserted into the corresponding first fixing hole 733, and preferably, the number of the first fixing holes 733 is 4 to 6, therefore, the height of the upper supporting back plate 72 can be conveniently adjusted according to the use of the box body 1 with different volume sizes, so as to better provide stable support for the box body 1.

As shown in fig. 5, 8 and 11, a fourth connecting plate 51 is fixedly arranged on one side of the mounting plate 5, the front and rear sides of the expansion plate 4 are both recessed inwards and form fourth connecting cavities 43 matched with the fourth connecting plate 51, the fourth connecting plate 51 is movably inserted into the fourth connecting cavities 43, a second locking mechanism 65 for locking and fixing the fourth connecting plate 51 is further arranged at the lower end of the expansion plate 4, by adopting the structure, the position of the mounting plate 5 can be conveniently adjusted, so that the position of the universal wheel 61 can be changed, meanwhile, the universal wheel 61 can be well locked and fixed, the stability of the whole structure can be ensured, therefore, the device can be well adapted to the use of the box bodies 1 with different sizes, so as to provide better support, and meanwhile, the supporting range of the bottom of the luggage box can be conveniently increased, therefore, when the luggage case is in a placing state, the luggage case is not easy to tip over due to external force collision, and the integrity of the luggage case is effectively ensured.

As shown in fig. 5, 8 and 11, the second locking mechanism 65 includes a second knob bolt 651, a second threaded hole 652 is formed at the lower end of the expansion plate 4, a plurality of second fixing holes 653 are formed at intervals along the length direction of the fourth connecting plate 51, and the second knob bolt 651 is threaded into the second threaded hole 652 and can be inserted into the corresponding second fixing holes 653, so as to provide a stable connection between the mounting plate 5 and the expansion plate 4, preferably, the number of the second fixing holes 653 is 2-4, that is, the universal wheel 61 has 2-4 mounting positions which can be adjusted to accommodate the use of the housings 1 with different sizes, thereby providing better support.

As shown in fig. 9 and 12, the locking mechanism 9 includes a locking block 91 and a locking groove 92, the locking block 91 is fixedly disposed on the upper supporting back plate 72, the locking groove 92 is disposed on the box body 1, and the locking block 91 and the locking groove 92 are adapted and detachably locked in the locking groove 92, by adopting this structure, stable connection between the box body 1 and the upper supporting back plate 72 can be effectively ensured, so as to further ensure stability of the overall structure of the luggage case.

As shown in fig. 2, fig. 5, fig. 6 and fig. 7, 2 suckers 8 are arranged on the expansion board 4, each sucker 8 comprises a sucker housing 81, a sucker colloid 82, a pressing buckle 83 and a third compression spring 84, a mounting cavity 44 matched with the sucker housing 81 is arranged on the expansion board 4, the sucker housing 81 is fixedly arranged in the mounting cavity 44, a connecting column 85 is fixedly arranged at the center of the surface of one side of the sucker colloid 82, a connecting hole 811 matched with the connecting column 85 is arranged on the sucker housing 81, the sucker housing 81 is sleeved on the sucker colloid 82, one end of the connecting column 85 passes through the connecting hole 811 and is hinged with the pressing buckle 83, the pressing buckle 83 is abutted to the sucker housing 81, the outer diameter of the sucker colloid 82 is greater than that of the sucker housing 81, the third compression spring 84 is sleeved on the connecting column 85, one end of the third compression spring 84 abuts against the sucker colloid 82, and the other end abuts against the sucker housing 81, and by adopting this structure, by pressing the press button 83, thereby driving the connecting column 85 to move upwards, thereby pulling up the middle part of the sucker colloid 82, generating a vacuum adsorption effect between the sucker colloid 82 and the adsorption plate 11, thereby realizing the adsorption of the sucking disc 8 on the adsorption plate 11 at the lower end of the box body 1, well fixing the box body 1, the operation is simple, the use is convenient, when the box body 1 needs to be replaced, the press buckle 83 can be conveniently lifted, thereby moving the connecting column 85 downwards and causing the sucker colloid 82 to reset, at this time, the sucking disc 8 no longer to adsorption plate 11 produces the adsorption, in addition, sucking disc colloid 82 can adopt the rubber material preparation to form.

As shown in fig. 6, the connection post 85 is preferably rectangular and the corresponding connection hole 811 is preferably rectangular, so that when the suction cup 8 is operated, the movement of the connection post 85 can be guided.

A suitcase convenient to change box 1's application method as follows: when in use, firstly, the box body 1 with a proper volume is selected, the mounting position of the universal wheel 61 is adjusted by operating the second knob bolt 651, the height of the upper supporting back plate 72 is adjusted by operating the first knob bolt 731, then the two expansion plates 4 are pulled open towards two sides, the box body 1 is placed on the supporting bottom plate 3, the positioning block 31 on the supporting bottom plate 3 is clamped in the positioning groove 12 at the lower end of the box body 1, the clamping block 91 of the upper supporting back plate 72 is clamped in the clamping groove 92 of the box body 1, after the expansion plates 4 are loosened, the baffle plate 41 on the expansion plates 4 can press the left side and the right side of the box body 1 under the elastic force of the first compression spring 62, and the lower supporting back plate 71 can press the rear side of the box body 1 under the elastic force of the second compression spring 63, then the press buckle 83 on the suction cup 8 is pressed, the suction cup 8 can be used for sucking and fixing the suction plate 11 at the lower end of the box body 1, thereby ensuring the stable placement of the box body 1.

The aforesaid is only a plurality of concrete implementation manners of the utility model, nevertheless the utility model discloses a design concept is not limited to this, and the ordinary use of this design is right the utility model discloses carry out immaterial change, all should belong to the act of infringement the protection scope of the utility model.

Claims (10)

1. The utility model provides a suitcase convenient to change box which characterized in that: comprises a box body, a pull rod and a supporting bottom plate, wherein expansion plates are arranged on the left side and the right side of the supporting bottom plate, the expansion plates are movably connected with the supporting bottom plate, mounting plates are arranged on the front side and the rear side of the expansion plates, universal wheels are fixedly connected with the lower ends of the mounting plates, a lower supporting back plate is arranged on the rear side of the supporting bottom plate, the lower supporting back plate is movably connected with the supporting bottom plate, an upper supporting back plate is arranged at the upper end of the lower supporting back plate, the upper supporting back plate is movably connected with the lower supporting back plate, a first locking mechanism for locking and fixing the upper supporting back plate is arranged on the lower supporting back plate, the pull rod is fixedly arranged on the rear side face of the lower supporting back plate, the box body is detachably arranged on the supporting bottom plate, and at least one sucking disc for adsorbing the box body is arranged on the expansion plates, the box lower end face is fixedly provided with an adsorption plate corresponding to the sucker, and a clamping mechanism is further arranged between the box and the upper supporting back plate.

2. The luggage case facilitating exchange of the case body according to claim 1, wherein: the supporting base plate is characterized in that a positioning block is fixedly arranged at the center of the upper end face of the supporting base plate, and a positioning groove matched with the positioning block is formed in the lower end face of the box body.

3. The luggage case facilitating exchange of the case body according to claim 1, wherein: and a baffle is fixedly arranged on one side of the upper end surface of the expansion plate, which is far away from the supporting bottom plate.

4. The luggage case facilitating exchange of the case body according to claim 1, wherein: a first connecting plate is fixedly arranged on one side of the expansion plate, a first limiting groove is arranged on the first connecting plate, the left side surface and the right side surface of the supporting bottom plate are both sunken inwards and form a first connecting cavity penetrating through the lower end surface, the first connecting cavity is matched with the first connecting plate, a first limiting block matched with the first limiting groove is fixedly arranged in the first connecting cavity, the first connecting plate is movably inserted in the first connecting cavity and enables the first limiting block to be clamped in the first limiting groove, a first compression spring is further arranged in the first connecting cavity, one end of the first compression spring is abutted against the first limiting block, the other end of the first compression spring is abutted against the first connecting plate, a second connecting plate is fixedly arranged on one side of the lower supporting back plate, a second limiting groove is arranged on the second connecting plate, the rear side surface of the supporting bottom plate is sunken inwards and forms a second connecting cavity penetrating through the lower end surface, the second connecting cavity is matched with the second connecting plate, a second limiting block matched with the second limiting groove is fixedly arranged in the second connecting cavity, the second connecting plate is movably inserted into the second connecting cavity and enables the second limiting block to be clamped in the second limiting groove, a second compression spring is further arranged in the second connecting cavity, one end of the second compression spring is abutted to the second limiting block, the other end of the second compression spring is abutted to the second connecting plate, and the lower end face of the supporting base plate is fixedly connected with a sealing plate used for covering the first connecting cavity and the second connecting cavity.

5. The luggage case facilitating exchange of the case body according to claim 1, wherein: the first locking mechanism comprises a first knob bolt, a third connecting plate is fixedly arranged at the lower end of the upper support back plate, the upper end face of the lower support back plate is inwards sunken and is formed with a third connecting cavity, the third connecting plate is movably inserted into the third connecting cavity, a first threaded hole is formed in the lower support back plate, a plurality of first fixing holes are formed in the third connecting plate along the length direction of the third connecting plate at intervals, and the first knob bolt is in threaded connection with the first threaded hole and can be inserted into the first fixing hole correspondingly.

6. The luggage case facilitating exchange of the case body according to claim 1, wherein: the fixed fourth connecting plate that is equipped with in mounting panel one side, both sides all inwards cave in and are formed with around the expansion plate with the fourth connection chamber of fourth connecting plate looks adaptation, the mobilizable inserting of fourth connecting plate is located in the fourth connection chamber, the expansion plate lower extreme still is equipped with and is used for right the fourth connecting plate plays the second locking mechanism of locking fixed action.

7. The luggage case facilitating exchange of the case body according to claim 6, wherein: the second locking mechanism comprises a second knob bolt, a second threaded hole is formed in the lower end of the expansion plate, a plurality of second fixing holes are formed in the fourth connecting plate at intervals along the length direction of the fourth connecting plate, and the second knob bolt is in threaded connection with the second threaded hole and can be inserted into the corresponding second fixing hole.

8. The luggage case facilitating exchange of the case body according to claim 1, wherein: the clamping mechanism comprises a clamping block and a clamping groove, the clamping block is fixedly arranged on the upper supporting backboard, the clamping groove is arranged on the box body, and the clamping block and the clamping groove are matched and detachably clamped in the clamping groove.

9. The luggage case facilitating exchange of the case body according to claim 1, wherein: the expansion board is provided with 2 suckers, each sucker comprises a sucker shell, a sucker colloid, a pressing buckle and a third compression spring, the expansion board is provided with an installation cavity matched with the sucker shell, the sucker shell is fixedly installed in the installation cavity, a connecting column is fixedly arranged at the center of the surface of one side of the sucker colloid, a connecting hole matched with the connecting column is arranged on the sucker shell, the sucker shell is sleeved on the sucker colloid, one end of the connecting column passes through the connecting hole and is hinged with the pressing buckle, the pressing buckle is abutted against the sucker shell, the outer diameter of the sucker colloid is larger than that of the sucker shell, the third compression spring is sleeved on the connecting column, one end of the third compression spring is abutted against the sucker colloid, and the other end of the third compression spring is abutted against the sucker shell.

10. A luggage case facilitating the exchange of luggage case according to claim 9, wherein: the connecting column is in a cuboid shape.

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