CN217777930U

CN217777930U - Bottom forming device of conjoined box forming machine

Info

Publication number: CN217777930U
Application number: CN202221853832.4U
Authority: CN
Inventors: 林德欢
Original assignee: Wenzhou Kemai Machinery Co ltd
Current assignee: Wenzhou Kemai Machinery Co ltd
Priority date: 2022-07-19
Filing date: 2022-07-19
Publication date: 2022-11-11
Anticipated expiration: 2032-07-19

Abstract

The utility model provides a end forming device of disjunctor box make-up machine which characterized in that: the bottom forming mechanism is arranged on the lower fixed seat; the supporting mechanism comprises a supporting platform, the supporting platform can be movably arranged on the lower fixing seat up and down and is positioned at the central position of the bottom forming mechanism, and the bottom of the supporting platform is connected with a buffer component capable of driving the supporting platform to move upwards; the pressing plate mechanism comprises a pressing plate assembly, the pressing plate assembly can be movably mounted on the upper fixing seat up and down and corresponds to the supporting platform, and the pressing plate assembly is connected with a lifting assembly driving the pressing plate assembly to move up and down. According to the scheme, the bottom forming mechanism is kept fixed, only one pressing action of the pressing plate mechanism is needed, the forming action of the bottom of the connected box can be completed, and the bottom forming mechanism is set to move up and down in a conventional bottom forming device.

Description

Bottom forming device of conjoined box forming machine

Technical Field

The utility model relates to a disjunctor box make-up machine technical field, concretely relates to end forming device of disjunctor box make-up machine.

Background

The paper carton is widely applied as an important packing material for containing products, and has the advantages of environmental protection, low cost, light weight and convenient transportation. The paper box is widely applied to industries such as electronics, food, beverage, wine, tea, cigarettes, medicine, health care products, cosmetics, small household appliances, clothes, toys, sports goods and the like, and industries such as product packaging matching and the like, which are indispensable industries.

The conjoined box is a paper box with an integrated structure of a bottom and a cover, and is a common paper box, and the conjoined box forming machine is automatic production equipment for producing and processing the conjoined box. The conjoined box forming machine generally comprises a feeding mechanism, a cover forming mechanism and a bottom forming mechanism.

For example, chinese utility model patent (CN 20977586U) discloses a bottom forming device of a conjoined box forming machine, which comprises a movable frame, a fixed frame, a supporting platform, a bottom forming part and the like, wherein the supporting platform is fixed on the fixed frame, the movable frame is movably arranged on the fixed frame from top to bottom, and the bottom forming part is installed on the movable frame by taking the supporting platform as the center. The action principle of bottom forming is as follows: after the paper board is fed in place, the paper board is pressed on the supporting table firstly, then the movable rack rises, and the bottom forming part on the movable rack can be used for turning and forming the paper box.

How to further optimize the structure and improve the production efficiency of the paper box is a technical problem which needs to be solved by the technicians in the field.

SUMMERY OF THE UTILITY MODEL

In order to overcome the deficiency of the background art, the utility model provides a bottom forming mechanism of a conjoined box forming machine.

The utility model discloses the technical scheme who adopts: a bottom forming device of a conjoined box forming machine comprises a rack, a bottom forming mechanism, a supporting mechanism and a pressing plate mechanism, wherein a lower fixed seat and an upper fixed seat which correspond up and down are arranged on the rack; the supporting mechanism comprises a supporting platform, the supporting platform can be movably arranged on the lower fixing seat up and down and is positioned at the central position of the bottom forming mechanism, and the bottom of the supporting platform is connected with a buffer component capable of driving the supporting platform to move upwards; the pressing plate mechanism comprises a pressing plate assembly, the pressing plate assembly is movably mounted on the upper fixing seat up and down and corresponds to the supporting platform, and the pressing plate assembly is connected with a lifting assembly driving the pressing plate assembly to move up and down.

The bottom forming mechanism comprises two groups of bottom forming parts which are arranged in a bilateral symmetry mode, each bottom forming part comprises a sliding seat, two forming plates which are arranged in a symmetry mode are arranged on the front side and the rear side of each sliding seat respectively, and a folding forming assembly used for folding the edges of the paper boards along folding lines is arranged in the middle of each sliding seat; the lower fixing seat is provided with first linear guide rails arranged along the left-right direction, the sliding seats are arranged on the first linear guide rails in a sliding manner, the sliding seats of the two groups of bottom forming components are connected through a sliding driving component, and the two sliding seats can synchronously slide in the opposite directions or in the opposite directions along the first linear guide rails; the sliding seat is provided with a second linear guide rail arranged along the front-back direction, the forming plates are arranged on the second linear guide rail in a sliding mode, the two forming plates are connected through the adjusting assembly, and the two forming plates can synchronously slide in the opposite direction or in the opposite direction along the second linear guide rail.

And the forming plate is fixedly connected with a separating sheet.

The adjusting assembly comprises a first connecting guide rail, a second connecting guide rail and a first screw rod; first connection guide rail constitutes sliding connection with the profiled sheeting at front side position in the profiled sheeting at two sets of end profiled sheeting simultaneously, the second is connected the guide rail and is constituted sliding connection with the profiled sheeting at rear side position in the profiled sheeting at two sets of end profiled sheeting simultaneously, first screw rod both ends are connected guide rail, second respectively and are connected guide rail screw-thread fit, and the screw thread opposite direction at first screw rod both ends.

The sliding driving assembly comprises a second screw, the two ends of the second screw are respectively in threaded fit with the sliding seats in the two sets of bottom forming parts, and the directions of threads at the two ends of the second screw are opposite.

The edge folding forming assembly comprises a rotating shaft, a clamping plate shaft seat, a power source and an elastic connecting piece; the rotating shaft is rotatably arranged on the sliding seat, one end of the clamping plate shaft seat is fixedly connected with the rotating shaft, the other end of the clamping plate shaft seat is rotatably connected with the clamping plate, one end of the power source is hinged with the sliding seat, and the other end of the power source is hinged with the clamping plate; the elastic connecting piece can provide an elastic force which can drive the clamping plate and the clamping plate shaft seat to be kept in a turned-open state.

The clamping plate shaft seat is connected with an extension plate extending downwards, the elastic connecting piece is connected with the lower end part of the extension plate, and an elastic force capable of driving the clamping plate shaft seat to rotate towards the mounting plate direction is provided for the extension plate.

The pressing plate component comprises a connecting seat, two connecting rods, two pressing blocks and a third screw rod, wherein the third linear guide rails are formed at the bottom of the connecting seat and arranged in the front-back direction, the third linear guide rails are in sliding fit with the upper end of the connecting rod, the pressing blocks are connected with the lower end of the connecting rod, two ends of the third screw rod are in threaded fit with the two connecting rods respectively, and the thread directions of two ends of the third screw rod are opposite.

The lifting assembly comprises a fourth linear guide rail, a motor and a transmission gear, the fourth linear guide rail is longitudinally arranged, the fourth linear guide rail is in sliding fit with the upper fixing seat, the lower end of the fourth linear guide rail is fixedly connected with the pressing plate assembly, a rack is formed on the fourth linear guide rail, the motor is fixedly mounted on the upper fixing seat, the output end of the motor is connected with the transmission gear, and the transmission gear is meshed with the rack.

In the bottom forming process, the paperboard is placed on the supporting table, the bottom forming mechanism is kept fixed, the pressing plate assembly moves downwards under the driving of the lifting assembly, after the pressing plate assembly presses the paperboard on the supporting table, the paperboard can be driven and the supporting table moves downwards together, the paperboard is bent and formed along self creases under the limitation of the bottom forming mechanism, after the bottom of the conjoined box is formed, the pressing plate assembly moves upwards in a reset mode under the driving of the lifting assembly, the supporting table resets under the driving of the buffering assembly, and the conjoined box for completing the bottom forming is pushed out from the bottom forming mechanism.

The utility model has the advantages that: by adopting the scheme, the bottom forming mechanism is kept fixed, only one pressing action of the pressing plate mechanism is needed, and then the forming action of the bottom of the connected box can be completed.

Drawings

Fig. 1 is a schematic structural view of the conjoined box forming machine according to the embodiment of the present invention.

Fig. 2 is a schematic structural view of a bottom forming device according to an embodiment of the present invention.

Fig. 3 is a schematic structural view of a bottom forming mechanism according to an embodiment of the present invention.

Fig. 4 is a schematic structural view of the hem forming assembly according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a platen mechanism according to an embodiment of the present invention.

Detailed Description

The embodiments of the present invention will be further explained with reference to the drawings.

The conjoined box forming machine is used for automatically processing and forming the conjoined box, and generally comprises a rack, a feeding device, a paperboard bin, a cover forming device and a bottom forming device, wherein the paperboard bin, the cover forming device and the bottom forming device are sequentially arranged along the feeding device, and the bottom forming device is used for automatically forming the bottom of the conjoined box.

As shown in fig. 1-5, a bottom forming device of a conjoined box forming machine comprises a frame 1, a bottom forming mechanism 2, a supporting mechanism 3 and a pressing plate mechanism 4.

The rack 1 is provided with a lower fixing seat 11 and an upper fixing seat 12 which correspond up and down.

The bottom forming mechanism 2 is installed on the lower fixing seat 11, the bottom forming mechanism 2 comprises two sets of bottom forming parts which are arranged in a bilateral symmetry mode, and each bottom forming part comprises a sliding seat 21, a forming plate 22 and a flanging forming assembly 23. The folding mechanism comprises a sliding seat 21, a folding forming assembly 23 and a forming plate 22, wherein the sliding seat 21 comprises a base and a mounting plate mounted on the base, the forming plate 22 is provided with two symmetrical plates which are arranged on the front side and the rear side of the sliding seat 21, the folding forming assembly 23 is mounted on the mounting plate and used for folding the edge of a paperboard along a folding line, and a separating sheet 27 is fixedly connected to the forming plate 22.

The lower fixing seat 11 is provided with a first linear guide rail 13 arranged along the left-right direction, the sliding seats 21 are arranged on the first linear guide rail 13 in a sliding manner, and the sliding seats 21 of the two groups of bottom forming components are connected through a sliding driving component 24. The sliding driving assembly 24 includes a second screw 241, two ends of the second screw 241 are respectively in threaded fit with the sliding seats 21 in the two sets of bottom forming components, and the thread directions at two ends of the second screw 241 are opposite, and the second screw 241 is driven by a motor to rotate, so that the two sliding seats 21 can synchronously slide in opposite directions or in opposite directions along the first linear guide rail 13.

The sliding seat 21 is provided with a second linear guide rail 25 arranged along the front-back direction, the forming plate 22 is slidably arranged on the second linear guide rail 25, and the two forming plates 22 are connected through an adjusting component 26. Wherein the adjusting assembly 26 comprises a first connecting guide 261, a second connecting guide 262, a first screw 263; first connecting guide 261 constitutes sliding connection with the profiled sheeting 22 of front side position in two sets of end profiled sections simultaneously, second connecting guide 262 constitutes sliding connection with the profiled sheeting 22 of rear side position in two sets of end profiled sections simultaneously, first screw 263 both ends respectively with first connecting guide 261, second connecting guide 262 screw-thread fit, and the screw thread direction at first screw 263 both ends is opposite, and it is rotatory through first screw 263 of motor drive, alright realize that two profiled sheeting 22 slide in opposite directions or opposite directions along the synchronization of second linear guide 25.

Sliding seat 21 and profiled sheeting 22 are used for the bottom location shaping of disjunctor box, and drive assembly 24 that slides is used for realizing that two sliding seat 21 are along the distance adjustment of left right direction, adjusting part 26 is used for realizing that two profiled sheeting on the sliding seat are along the distance adjustment of fore-and-aft direction, can adjust sliding seat 21 and profiled sheeting 22 to suitable position according to the actual size of disjunctor box bottom portion, and not only simple structure adjusts moreover fast, accurately. The first connecting guide rail 261 and the second connecting guide rail 262 in the adjusting assembly 26 connect the molding plates 22 in the two sets of bottom molding parts into a whole, so that the synchronous adjustment of the molding plates 22 in the two sets of bottom molding parts is realized, the adjusting precision is further improved, and the bottom molding quality of the connected box is ensured.

The flanging molding assembly 23 comprises a rotating shaft 231, a clamping plate 232, a clamping plate shaft seat 233, a power source 234 and an elastic connecting piece 235; the rotating shaft 231 is rotatably mounted on the sliding seat 21, one end of the clamping plate shaft seat 233 is fixedly connected with the rotating shaft 231, the other end of the clamping plate shaft seat 233 is rotatably connected with the clamping plate 232, the power source 234 is an air cylinder, one end of the power source is hinged with the sliding seat 21, and the other end of the power source is hinged with the clamping plate 232; the elastic connector 235 provides an elastic force to keep the clamp plate 232 and the clamp plate shaft seat 233 in the opened state.

The two clamping plate shaft seats 233 are respectively arranged at two ends of the rotating shaft 231 and are respectively hinged with two ends of the clamping plate 232, so that the structure is more stable, and the action is more reliable. And limiting shafts corresponding to the clamping plate shaft seats 233 extend from two sides of the clamping plate 232 and can be in limiting fit with the clamping plate shaft seats 233.

The elastic connecting member may be applied to the clamping plate shaft seat, or may be applied to the clamping plate, or may be used to connect the clamping plate shaft seat and the clamping plate, in this embodiment, one of the clamping plate shaft seats 233 is connected to an extension plate 236 extending downward, the elastic connecting member 235 is a tension spring, one end of the elastic connecting member is connected to a lower end of the extension plate 236, and the other end of the elastic connecting member is connected to the sliding seat, so as to provide an elastic force for the extension plate 236 to drive the clamping plate shaft seat 233 to rotate toward the mounting plate. Of course, two extension plates and two elastic connecting pieces can be provided and respectively act on the two clamping plate shaft bases 233.

When the hem forming action is carried out, the hem forming action is usually carried out in two steps, the first step is the rotating action of the clamping plate shaft seat, the clamping plate can be driven to synchronously move around the rotating shaft, the clamping plate and the clamping plate shaft seat are kept in a so-called turning-open state at the moment, the second step is the rotating action of the clamping plate, the clamping plate can rotate relative to the clamping plate shaft seat, the clamping plate is turned over to a closed state from the turning-open state, and the clamping plate can clamp a turned-over edge with the side face of the mounting plate to achieve the purpose of hem forming.

The working principle of the flanging forming assembly is as follows:

adjust the power supply to initial operating condition, under elastic connection's effect, the splint axle bed is rotatory towards the mounting panel direction, keep spacing contact with spacing axle, at this moment, the relative splint axle bed of splint is turned over and is located the position of keeping away from mounting panel installation template one side, under the location guide effect of cardboard at mounting panel and profiled sheeting, its three sides are along the crease by turning over the back of shaping, the power supply action upwards promotes splint action, but because elastic connection's effect, it can drive the splint axle bed and rotate towards the mounting panel direction along the pivot, thereby make splint and splint axle bed keep relatively fixed, it is spacing until splint axle bed and mounting panel contact are turned over in the action of revolving shaft center upset to make splint be equivalent to, accomplish first step hem action, along with the power supply continues upwards promotion action, because the contact of splint axle bed and mounting panel is spacing, the splint axle bed can's unable continuation rotation, the splint axle bed then can be rotatory relatively to the splint axle bed at this moment, it overturns to drive the relative splint axle bed, accomplish the hem action of second step, realize hem shaping purpose.

Only need a power supply and cooperation elastic connection spare, alright drive splint carry out two hem actions, realize the shaping of carton hem, adopt the structure of dual dynamical source among the conventional technology, not only the structure is simpler, and the cost is lower, and the action is fast moreover, and work efficiency is high.

The supporting mechanism 3 comprises a supporting platform 31, the supporting platform 31 is movably mounted on the lower fixing seat 11 up and down and is located at the central position of the bottom forming mechanism 2, and a buffer assembly 32 capable of driving the supporting platform 31 to move upwards is connected to the bottom of the supporting platform 31. The cushion assembly 32 is a cylinder assembly, when the pallet 31 is pressed downward, the pallet 31 will descend smoothly, and when the downward pressure is small, the pallet will return smoothly under the action of air pressure.

The pressing plate mechanism 4 comprises a pressing plate assembly 41, the pressing plate assembly 41 is movably mounted on the upper fixing seat 12 up and down and corresponds to the supporting platform 31, and the pressing plate assembly 41 is connected with a lifting assembly 42 for driving the pressing plate assembly to move up and down.

The pressing plate assembly 41 includes a connecting seat 411, two connecting rods 412, a pressing block 413 and a third screw 414, a third linear guide 415 arranged in the front-rear direction is formed at the bottom of the connecting seat 411, the third linear guide 415 at the upper end of the connecting rod 412 is in sliding fit, the pressing block 413 is connected at the lower end of the connecting rod 412, two ends of the third screw 414 are in threaded fit with the two connecting rods 412 respectively, and the thread directions at two ends of the third screw 414 are opposite. The motor drives the third screw 414 to rotate, so that the two connecting rods 412 can synchronously slide in the opposite directions or reversely slide along the third linear guide 415, and the distance between the two pressing blocks 413 can be adjusted to a proper position according to the actual size of the bottom of the connected box.

The lifting assembly 42 comprises a fourth linear guide rail 421, a motor 422 and a transmission gear 423, the fourth linear guide rail 421 is longitudinally arranged, the fourth linear guide rail 421 is matched with the upper fixing seat 12 in a sliding manner, the lower end of the fourth linear guide rail 421 is fixedly connected with the pressing plate assembly 41, a rack 424 is formed on the fourth linear guide rail 421, the motor 422 is fixedly installed on the upper fixing seat 12, the output end of the motor 422 is connected with the transmission gear 423, the transmission gear 423 is meshed with the rack 424, the transmission gear 423 is driven to rotate through the motor 422, and the transmission gear 423 and the rack 424 are meshed to drive the fourth linear track 421 to move, so that the lifting action of the pressing plate assembly 41 can be realized. Wherein, fourth linear guide 421 and rack 424 integrated into one piece, have optimized the structure, the cost is reduced.

The working principle of the bottom forming device of the conjoined box forming machine is as follows:

according to the actual size of the bottom of the conjoined box, the sliding seat 21 on the two bottom forming components is moved to a proper position by the sliding driving component 24, the two forming plates 22 on the sliding seat 21 are moved to a proper position by the adjusting component 26, meanwhile, the pressing block 413 of the pressing plate component 41 is also adjusted to a proper position, then the paperboard is sent to the tray table 31 by the feeding table, then the lifting component 42 drives the pressing plate component 41 to press downwards, after the pressing plate component 41 presses the paperboard on the tray table 31, the paperboard and the tray table can be driven to move downwards together, in the process of downward movement, the paperboard firstly contacts the separating sheet 27, the separating sheet 27 turns up the bottom side ears of the paperboard according to the crease lines of the paperboard, then the paperboard contacts the forming plate 22, the forming plate 22 turns up the front and rear bottom side walls of the paperboard along the crease lines of the paperboard, after the pressing plate component 41 is pressed in place, the flanging forming component acts to complete the flanging positioning and forming, after the bottom of the conjoined box is formed, the pressing plate component 41 is driven by the lifting component 42 to move upwards, the tray table 31 is driven by the buffering component to reset, and pushes the conjoined box formed from the bottom.

Adopt above-mentioned scheme, end forming mechanism keeps fixed, only needs a of pressure plate mechanism to push down the action, alright accomplish disjunctor box bottom shaping action, compares in forming device at the bottom of the conventionality with end forming mechanism set to activity from top to bottom, above-mentioned scheme can reduce the action step for the action beat, thereby improve work efficiency greatly.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The skilled person should know that: although the present invention has been described in accordance with the above embodiments, the inventive concept is not limited to this embodiment, and any modification of the inventive concept will be included in the scope of the patent claims.

Claims

1. The utility model provides a end forming device of disjunctor box make-up machine, includes frame (1), end forming mechanism (2), supporting mechanism (3), clamp plate mechanism (4), its characterized in that:

a lower fixing seat (11) and an upper fixing seat (12) which correspond to each other up and down are arranged on the rack (1), and the bottom forming mechanism (2) is installed on the lower fixing seat (11);

the supporting mechanism (3) comprises a supporting platform (31), the supporting platform (31) is movably arranged on the lower fixing seat (11) up and down and is positioned at the central position of the bottom forming mechanism (2), and the bottom of the supporting platform (31) is connected with a buffer component (32) capable of driving the supporting platform to move upwards;

the pressing plate mechanism (4) comprises a pressing plate component (41), the pressing plate component (41) can be movably mounted on the upper fixing seat (12) up and down and corresponds to the supporting platform (31), and the pressing plate component (41) is connected with a lifting component (42) for driving the pressing plate component to move up and down.

2. The bottom forming device of the connected box forming machine according to claim 1, characterized in that: the bottom forming mechanism (2) comprises two groups of bottom forming parts which are arranged in a bilateral symmetry mode, each bottom forming part comprises a sliding seat (21), two forming plates (22) which are arranged in a symmetrical mode are respectively arranged on the front side and the rear side of each sliding seat (21), and a folding edge forming assembly (23) used for folding the edge of the paperboard along a folding line is arranged in the middle of each sliding seat (21);

the lower fixing seat (11) is provided with a first linear guide rail (13) which is arranged along the left-right direction, the sliding seats (21) are arranged on the first linear guide rail (13) in a sliding manner, the sliding seats (21) of the two groups of bottom forming parts are connected through a sliding driving assembly (24), and the two sliding seats (21) can synchronously slide in the opposite direction or in the opposite direction along the first linear guide rail (13);

be equipped with second linear guide (25) of arranging along the fore-and-aft direction on sliding seat (21), shaping board (22) slide to set up on second linear guide (25), and two shaping boards (22) are connected through adjusting part (26), and two shaping boards (22) can be followed second linear guide (25) and synchronous in opposite directions or slip in the opposite direction.

3. The bottom forming device of the connected box forming machine according to claim 2, characterized in that: the forming plate (22) is fixedly connected with a separating sheet (27).

4. The bottom forming device of the conjoined box forming machine according to claim 2, wherein: the adjusting component (26) comprises a first connecting guide rail (261), a second connecting guide rail (262) and a first screw rod (263); first connection guide rail (261) constitute sliding connection with two sets of end shaping parts in front side position's shaping board (22) simultaneously, second connection guide rail (262) constitute sliding connection with two sets of end shaping parts in back side position's shaping board (22) simultaneously, first screw rod (263) both ends connect guide rail (262) screw-thread fit with first connection guide rail (261), second respectively, and the screw thread opposite direction at first screw rod (263) both ends.

5. The bottom forming device of the connected box forming machine according to claim 2, characterized in that: the sliding driving assembly (24) comprises a second screw (241), two ends of the second screw (241) are respectively in threaded fit with the sliding seats (21) in the two sets of bottom forming parts, and the thread directions of the two ends of the second screw (241) are opposite.

6. The bottom forming device of the conjoined box forming machine according to claim 2, wherein: the flanging forming assembly (23) comprises a rotating shaft (231), a clamping plate (232), a clamping plate shaft seat (233), a power source (234) and an elastic connecting piece (235); the rotating shaft (231) is rotatably installed on the sliding seat (21), one end of the clamping plate shaft seat (233) is fixedly connected with the rotating shaft (231), the other end of the clamping plate shaft seat is rotatably connected with the clamping plate (232), one end of the power source (234) is hinged with the sliding seat (21), and the other end of the power source is hinged with the clamping plate (232); the elastic connecting piece (235) can provide an elastic force which can drive the clamping plate (232) and the clamping plate shaft seat (233) to keep the open state.

7. The bottom forming device of the connected box forming machine according to claim 6, characterized in that: the clamping plate shaft seat (233) is connected with an extension plate (236) extending downwards, the elastic connecting piece (235) is connected with the lower end part of the extension plate, and provides an elastic force which can drive the clamping plate shaft seat (233) to rotate towards the mounting plate direction for the extension plate (236).

8. The bottom forming device of the connected box forming machine according to claim 1, characterized in that: the pressing plate assembly (41) comprises a connecting seat (411), a connecting rod (412), a pressing block (413) and a third screw (414), wherein the bottom of the connecting seat (411) is provided with a third linear guide rail (415) arranged along the front-back direction, the connecting rod (412) is provided with two connecting rods, the third linear guide rail (415) of the upper end of the connecting rod is in sliding fit, the lower end of the connecting rod is connected with the pressing block (413), the two ends of the third screw (414) are in threaded fit with the two connecting rods (412) respectively, and the thread directions of the two ends of the third screw (414) are opposite.

9. The bottom forming device of the connected box forming machine according to claim 1, characterized in that: lifting unit (42) include fourth linear guide (421), motor (422), drive gear (423), fourth linear guide (421) longitudinal arrangement, fourth linear guide (421) and last fixing base (12) sliding fit, and its lower extreme and clamp plate subassembly (41) fixed connection, fourth linear guide (421) are formed with rack (424), motor (422) fixed mounting is on last fixing base (12), and drive gear (423) is connected to its output, drive gear (423) and rack (424) mesh mutually.