CN217437325U

CN217437325U - Tension adjusting device of coating film

Info

Publication number: CN217437325U
Application number: CN202221330988.4U
Authority: CN
Inventors: 方城
Original assignee: Yangzhou Hiexcel Advanced Materials Co ltd
Current assignee: Yangzhou Hiexcel Advanced Materials Co ltd
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2022-09-16
Anticipated expiration: 2032-05-30

Abstract

The utility model provides a tension adjusting device for a coating film, which relates to the technical field of coating machines. It includes a box body, the box body is a hollow structure with openings on both sides, and the box body is provided with a regulating roller, a floating roller, a detection roller and a deviation correction assembly, and the regulating roller is rotatably connected with two sliders, and the box body The side walls of the two sides are provided with second through grooves matching the second through groove, and a lead screw is rotatably connected in the second through groove. The outer wall of the box is fixed with a function box, and the function box is provided with a deceleration mechanism matching the lead screw. The deceleration mechanism brake motor, bevel gear 1, bevel gear 8, L-shaped rod, support plate 1, The second bevel gear, the third bevel gear, the fifth bevel gear, the connecting shaft, the second support plate, the sixth bevel gear, the seventh bevel gear, and the seventh bevel gear is coaxially fixed with the lead screw. The utility model adjusts the tension of the coating film evenly, the tension fluctuation is small, and the coating film will not be damaged.

Description

Tension adjusting device of coating film

Technical Field

The utility model provides a tension adjusting device of coating film relates to coating machine technical field.

Background

The coating machine is mainly used for the surface coating process production of films, paper and the like, and is characterized in that a coiled base material is coated with a layer of glue, paint or ink with a specific function and the like, and is wound after being dried. In the processing process of the coating film, the unwinding tension of the coating film plays an important role in the processing quality of the film. However, in the unwinding process of the coating film, the tension of the coating film itself may be loosened, the intermittence of the switching between the processes is large, the coating film may also be loosened, the coating film may wrinkle easily due to too small tension, the conveying of the coating film is difficult due to small force, and the deformation of the coating film due to uneven tension may affect the quality of the product. The traditional tension control mechanism is realized by manually adjusting a spring, the device mainly comprises a chain, a friction block and a spring, the output torsion of the paying-off spool is changed by manually adjusting the spring, but the tension fluctuation is large in the manual adjustment mode in the adjustment process, the force is unbalanced, the coating film is easy to pull and damage, and therefore the tension adjusting device for the coating film is provided.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a tension adjusting device of coating film has solved that tension accommodation process tension is undulant big among the prior art, the dynamics is uneven, lead to the coating film to drag the problem of damage easily.

The utility model provides a tension adjusting device of a coating film, which comprises a box body, wherein the box body is of a hollow structure with openings on two sides, a regulating roller, a floating roller, a detection roller and a deviation rectifying component are arranged in the box body, the floating roller and the detection roller are arranged above the regulating roller and symmetrically arranged about the regulating roller, the coaxial rigid coupling of the floating roller is provided with a first rotating shaft, two ends of the first rotating shaft are rotatably connected with a first sliding block, the side walls on two sides of the box body are provided with a first through groove matched with the first sliding block, a spring is fixedly connected between the bottom surface of the first sliding block and the inner wall at the bottom of the first through groove, the coaxial rigid coupling of the detection roller is provided with a third rotating shaft, two ends of the third rotating shaft are rotatably connected with a third sliding block, the side walls on two sides of the box body are provided with a third through groove matched with three phases of the sliding block, the bottom of the third through groove is fixedly connected with a pressure sensor, the third sliding block is arranged on the pressure sensor, the adjusting roller is coaxially and fixedly connected with a second rotating shaft, two ends of the second rotating shaft are rotatably connected with a second sliding block, the side walls of two sides of the box body are provided with second through grooves matched with the second sliding block, the second through grooves are rotatably connected with a lead screw, the second sliding block is sleeved outside the lead screw and forms thread transmission with the lead screw, the outer wall of the box body is fixedly connected with a function box, a speed reducing mechanism matched with the lead screw is arranged in the function box, the speed reducing mechanism comprises a brake motor fixedly connected to the bottom in the function box, an output shaft of the brake motor is coaxially and fixedly connected with a first bevel gear, the first bevel gear is meshed with a eighth bevel gear, the eighth bevel gear is rotatably connected with an L-shaped rod, the L-shaped rod is rotatably connected with a first supporting plate, one side of the first supporting plate, close to the first bevel gear, is fixedly connected with a second bevel gear, the second bevel gear is meshed with the eighth bevel gear, and the second bevel gear is rotatably connected with the L-shaped rod, one end, far away from the eight bevel gears, of the L-shaped rod penetrates through the supporting plate and is coaxially and fixedly connected with a third bevel gear, the third bevel gear is meshed with a fifth bevel gear, the fifth bevel gear is coaxially and fixedly connected with a connecting shaft, the connecting shaft is rotatably connected with a second supporting plate, one end, far away from the fifth bevel gear, of the connecting shaft is coaxially and fixedly connected with a sixth bevel gear, the sixth bevel gear is meshed with a seventh bevel gear, and the seventh bevel gear is coaxially and fixedly connected with a lead screw.

The correcting component comprises a correcting plate which is symmetrically arranged in the box body, one surface of the correcting plate, which is away from the correcting plate, is hinged with a first connecting rod, one end of the first connecting rod, which is away from the correcting plate, is hinged with a second connecting rod, one end of the second connecting rod, which is away from the first connecting rod, is hinged with the inner wall of the box body, the side wall of the box body is in threaded connection with a handle bolt, one end of the handle bolt penetrates through the side wall of the box body and is rotatably connected with the correcting plate, and idler wheels are arranged on the upper side and the lower side of the correcting plate.

The box internal rotation is connected with pivot four, the coaxial rigid coupling of pivot four has the guide roll, the position and the subassembly of rectifying of guide roll cooperate.

And the bevel gear V is meshed with a bevel gear IV, the bevel gear IV is rotatably connected with a circular shaft, and one end of the circular shaft, which is far away from the bevel gear IV, is fixedly connected with the side wall of the functional box.

The two sides of the first sliding block, the second sliding block and the third sliding block are fixedly connected with limiting edges, and sliding grooves matched with the limiting edges are formed in the inner walls of the first through groove, the second through groove and the third through groove.

And the side wall of the functional box is provided with a through hole, and the position of the through hole is matched with the second through groove.

The first support plate and the second support plate are fixedly connected with the inner bottom surface of the functional box, and the locking universal wheels are installed at the bottom of the box body.

The utility model has the advantages that:

the utility model provides a tension adjusting device of a coating film, which can adjust the tension of the coating film through the setting of an adjusting roll, and through the setting of a reducing mechanism, the adjusting roll can move up and down slowly when adjusting the tension, thereby avoiding larger tension fluctuation and being more beneficial to fine adjustment, through the setting of a floating roll, the tension of the coating film can be automatically adjusted in a small range, the self-adaptive capacity of the coating film is improved, the times of manual adjustment are reduced, the work efficiency is improved, through the setting of a detecting roll, the pressure of the coating film on the detecting roll can be detected, the data basis of tension adjustment is provided, the pressure data can be grasped by the working personnel in real time, the tension adjustment is more accurate, all structures are arranged on a box body, and the box body can move through a locking universal wheel, and is convenient to be matched with various devices, the practicability is improved.

Drawings

Fig. 1 is a schematic view of the overall structure of a tension adjusting device for a coating film according to the present invention.

Fig. 2 is an enlarged view of the first through groove of the tension adjusting device for coating film of the present invention.

Fig. 3 is an enlarged view of a third through-groove of a tension adjusting device for a coating film of the present invention.

Fig. 4 is a sectional view of a case of a tension adjusting device for a coating film according to the present invention.

Fig. 5 is a side view of a deviation correction plate of the tension adjusting device for coating film of the present invention.

Fig. 6 is a top view of the deviation rectifying assembly of the tension adjusting device for coating film of the present invention.

Fig. 7 is a top view of the inside of a functional box of a tension adjusting device for a coating film according to the present invention.

(1, box body; 2, first through groove; 3, handle bolt; 4, second through groove; 5, second sliding block; 6, function box; 7, screw rod; 8, fourth rotating shaft; 9, third through groove; 10, first sliding block; 11, first rotating shaft; 12, spring; 13, floating roller; 14, third sliding block; 15, third rotating shaft; 16, pressure sensor; 17, detection roller; 18, deviation-correcting plate; 19, guide roller; 20, adjusting roller; 21, second rotating shaft; 22, roller; 23, first connecting rod; 24, second connecting rod; 25, brake motor; 26, first bevel gear; 27, L-shaped rod; 28, second bevel gear; 29, first supporting plate; 30, third bevel gear; 31, fourth bevel gear; 32, fifth bevel gear; 33, second supporting plate; 34, sixth bevel gear; 35, seventh bevel gear; 36, eighth bevel gear)

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 7, the utility model provides a tension adjusting device for coating film, which comprises a box body 1, as shown in fig. 1 and 4, the box body 1 is a hollow structure with two open sides, an adjusting roll 20, a floating roll 13, a detecting roll 17 and a deviation rectifying component are arranged in the box body 1, the floating roll 13 and the detecting roll 17 are arranged above the adjusting roll 20 and are symmetrically arranged about the adjusting roll 20, as shown in fig. 2, the floating roll 13 is coaxially and fixedly connected with a rotating shaft I11, two ends of the rotating shaft I11 are both rotatably connected with a slide block I10, the side walls of two sides of the box body 1 are provided with a first through groove 2 matched with the slide block I10, a spring 12 is fixedly connected between the bottom surface of the slide block I10 and the inner wall of the bottom of the first through groove 2, specifically, when the slide block I10 is pressed, the spring 12 is extruded, when the pressure is reduced, the slide block I10 can be reset under the restoring force of the spring 12, therefore, through the arrangement of the spring 12, the first sliding block 10 can move up and down within a certain range when the tension of the coating film changes, so that the first sliding block has a certain buffering effect and also has an automatic adjusting effect, as shown in fig. 3, the detection roller 17 is coaxially and fixedly connected with the third rotating shaft 15, two ends of the third rotating shaft 15 are rotatably connected with the third sliding block 14, the side walls of two sides of the box body 1 are provided with third through grooves 9 matched with the third sliding blocks 14, the bottom of the third through grooves 9 is fixedly connected with the pressure sensor 16, the third sliding blocks 14 are arranged on the pressure sensor 16, specifically, the pressure sensor 16 is connected with the controller, the pressure sensor 16 and the controller adopt the prior art, the specific model selection, the installation and the use are known by technicians in the field, so that no description is given, the detection roller 17 is subjected to the downward pressure of the coating film, and transmits the force to the pressure sensor 16 through the third sliding blocks 14, pressure sensor 16 is with data transmission to controller, and the user can read the pressure value on the controller, conveniently carries out tension to the coating film and adjusts, the coaxial rigid coupling of dancer 20 has pivot two 21, the both ends of pivot two 21 are all rotated and are connected with slider two 5, open lateral wall in 1 both sides of box has the second through-slot 4 with slider two 5 assorted, the rotation of second through-slot 4 is connected with lead screw 7, slider two 5 cover is established outside lead screw 7 and is formed the screw drive with lead screw 7, specifically, lead screw 7 rotates and to drive slider two 5 along lead screw 7 axial displacement to drive detection roller 17 and go up and down, adjust the rate of tension of coating film, box 1 outer wall rigid coupling has function box 6, be equipped with in the function box 6 with lead screw 7 assorted reduction gears, reduction gears includes the brake motor 25 of rigid coupling bottom in function box 6, a first bevel gear 26 is coaxially and fixedly connected to an output shaft of the brake motor 25, an eighth bevel gear 36 is meshed with the first bevel gear 26, the eighth bevel gear 36 is rotatably connected with an L-shaped rod 27, a short side of the L-shaped rod 27 is coaxially and fixedly connected with the eighth bevel gear 36, a long side of the L-shaped rod 27 is coaxially arranged with the first bevel gear 26, the L-shaped rod 27 is rotatably connected with a first support plate 29, one side, close to the first bevel gear 26, of the first support plate 29 is fixedly connected with a second bevel gear 28, the second bevel gear 28 is meshed with the eighth bevel gear 36, the second bevel gear 28 is rotatably connected with the L-shaped rod 27, one end, far away from the eighth bevel gear 36, of the L-shaped rod 27 penetrates through the first support plate 29 and is coaxially and fixedly connected with a third bevel gear 30, the third bevel gear 30 is meshed with a fifth bevel gear 32, the fifth bevel gear 32 is coaxially and fixedly connected with a connecting shaft, the connecting shaft is rotatably connected with a second support plate 33, and one end, far away from the fifth bevel gear 32, of the connecting shaft is coaxially and fixedly connected with a sixth bevel gear 34, the bevel gear six 34 is engaged with a bevel gear seven 35, the bevel gear seven 35 is coaxially and fixedly connected with the screw 7, specifically, the brake motor 25 can drive the bevel gear one 26 to rotate, because the bevel gear eight 36 is respectively engaged with the bevel gear one 26 and the bevel gear two 28, and the bevel gear two 28 is fixed, under the action of the bevel gear one 26 and the bevel gear two 28, the bevel gear eight 36 revolves around the bevel gear one 26 while rotating, so that the bevel gear eight 36 drives the L-shaped rod 27 to rotate, the L-shaped rod 27 drives the bevel gear three 30 to rotate, the bevel gear three 30 drives the bevel gear five 32 to rotate, the bevel gear five 32 drives the bevel gear six 34 to rotate through the connecting shaft, the bevel gear six 34 drives the bevel gear seven 35 to rotate, the bevel gear seven 35 drives the screw 7 to rotate, the screw 7 drives the slide block two 5 to move up and down in the second through groove 4, and the slide block two 5 drives the adjusting roller 20 to move up and down, thereby adjust the rate of tension of coating film, through reduction gears's setting, transmit brake motor 25's rotation to lead screw 7 and make the rotational speed reduce to make reciprocating of two 5 sliders comparatively slow, when adjusting the coating film tension, great tension fluctuation can not appear, make the dynamics even, avoid the coating film condition of dragging to appear.

As shown in fig. 5 and 6, the utility model discloses in the subassembly of rectifying includes that the symmetry sets up the board 18 of rectifying in box 1, the one side that the board 18 of rectifying departs from mutually all articulates there is connecting rod one 23, connecting rod one 23 one end of keeping away from the board 18 of rectifying articulates there is connecting rod two 24, connecting rod two 24 keep away from the one end of connecting rod one 23 articulated with 1 inner wall of box, 1 lateral wall threaded connection of box has handle

bolt

3, 3 one end of handle bolt run through 1 lateral wall of box and with the board 18 rotation of rectifying and be connected, the board 18 upper and lower both sides of rectifying all are equipped with gyro wheel 22. Specifically, the handle bolt 3 is rotated to drive the deviation rectifying plate 18 to move, so that the distance between the deviation rectifying plates 18 can be adjusted according to the width of the coating film, when the coating film is conveyed, the two sides of the coating film are placed in the deviation rectifying plates 18, the coating film is limited through the deviation rectifying plates 18, and deviation in the conveying process is avoided.

The utility model discloses in 1 internal rotation of box is connected with four 8 of pivot, the coaxial rigid coupling of four 8 of pivot has guide roll 19, guide roll 19's position and the subassembly of rectifying cooperate.

The utility model discloses in five 32 meshes of bevel gear have bevel gear four 31, bevel gear four 31 rotates and is connected with the circle axle, the one end and the 6 lateral wall rigid couplings of function box of bevel gear four 31 are kept away from to the circle axle. Specifically, the bevel gear five 32 drives the bevel gear four 31 to rotate when rotating, and the bevel gear four 31 is arranged on one side of the bevel gear five 32, so that the bevel gear five 32 is supported and limited, and the stability of the bevel gear five 32 is improved.

The utility model discloses in the equal rigid coupling in both sides of slider one 10, slider two 5, slider three 14 has spacing arris, first logical groove 2, second logical groove 4, third lead to groove 9 inner wall all open have with spacing arris assorted spout. Specifically, spacing arris block is at the spacing inslot and can slide in the spacing inslot, plays spacing effect to slider one 10, slider two 5, slider three 14, avoids slider one 10, slider two 5, slider three 14 and first logical groove 2, second logical groove 4, third logical groove 9 to break away from, and to slider two 5, the restriction of spacing arris can also make its unable rotation to make the screw thread transmission between slider two 5 and the lead screw 7 realize.

The utility model discloses in 6 lateral walls of function box open there is the through-hole, the position and the 4 phase-matchs in second through-groove of through-hole. Specifically, the through holes are provided so that the second through groove 4 communicates with the functional tank 6, thereby enabling the bevel gear six 34 to mesh with the bevel gear seven 35.

The utility model discloses in backup pad 29, backup pad two 33 all with function case 6 inner bottom surface rigid coupling, the locking universal wheel is installed to 1 bottom half. Specifically, the first support plate 29 supports the L-shaped rod 27, the second support plate 33 supports the connecting shaft, and the locking universal wheels facilitate movement of the box body 1.

The working principle is as follows: the utility model discloses when using, the coating film passes the board 18 of rectifying, then bypasses guide roll 19, detection roller 17, adjusting roller 20, floating roll 13, wears out from the board 18 of rectifying of opposite side. Starting the brake motor 25 to drive the first bevel gear 26 to rotate, wherein the eight bevel gear 36 is meshed with the first bevel gear 26 and the second bevel gear 28 respectively, and the second bevel gear 28 is fixed, under the action of the first bevel gear 26 and the second bevel gear 28, the eight bevel gear 36 revolves around the first bevel gear 26 while rotating, the eight bevel gear 36 drives the L-shaped rod 27 to rotate, the L-shaped rod 27 drives the third bevel gear 30 to rotate, the third bevel gear 30 drives the fifth bevel gear 32 to rotate, the fifth bevel gear 32 drives the sixth bevel gear 34 to rotate through a connecting shaft, the sixth bevel gear 34 drives the seventh bevel gear 35 to rotate, the seventh bevel gear 35 drives the lead screw 7 to rotate, the lead screw 7 drives the second slide block 5 to move up and down in the second through slot 4, the second slide block 5 drives the adjusting roller 20 to move up and down, so as to adjust the tension of the coating film, and the rotation of the brake motor 25 is transmitted to the lead screw 7 and the rotation speed is reduced through the setting of the speed reducing mechanism, thereby make reciprocating of second 5 of slider comparatively slowly, when adjusting coating film tension, great tension fluctuation can not appear to make the dynamics even, avoid the coating film condition of dragging to appear. When the coating film is conveyed on the floating roller 13 and the detection roller 17, downward pressure is generated on the floating roller 13 and the detection roller 17, when the pressure is too high, the spring 12 is downwards pressed through the first sliding block 10, so that the floating roller 13 moves downwards to play a role of relieving pressure, when the pressure is reduced, the first sliding block 10 moves upwards under the restoring force of the spring 12 to tension the coating film, and therefore the tension degree of the coating film can be automatically adjusted within a small range through the arrangement of the floating roller 13; the downward pressure enables the detection roller 17 to drive the third sliding block 14 to press the pressure sensor 16 downward, and the pressure sensor 16 can transmit data to the controller in real time, so that when the tension of the coating film is adjusted through the adjusting roller 20, the pressure data on the controller can be read as judgment basis. The handle bolt 3 is rotated to drive the deviation rectifying plates 18 to move, so that the distance between the deviation rectifying plates 18 can be adjusted according to coating films with different widths, and the two sides of the coating films are arranged in the deviation rectifying plates 18 to limit the coating films and prevent the coating films from deviating.

The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.

Claims

1. A tension adjusting device for a coating film, characterized in that: the device comprises a box body (1), the box body (1) is of a hollow structure with openings on two sides, a regulating roller (20), a floating roller (13), a detection roller (17) and a deviation rectifying assembly are arranged in the box body (1), the floating roller (13) and the detection roller (17) are arranged above the regulating roller (20) and are symmetrically arranged relative to the regulating roller (20), the floating roller (13) is coaxially fixedly connected with a first rotating shaft (11), two ends of the first rotating shaft (11) are rotatably connected with a first sliding block (10), side walls on two sides of the box body (1) are provided with a first through groove (2) matched with the first sliding block (10), a spring (12) is fixedly connected between the bottom surface of the first sliding block (10) and the inner wall of the bottom of the first through groove (2), the detection roller (17) is coaxially fixedly connected with a third rotating shaft (15), two ends of the third rotating shaft (15) are rotatably connected with a third sliding block (14), side walls on two sides of the box body (1) are provided with a third through groove (9) matched with the third sliding block (14), the third is led to the groove (9) bottom rigid coupling and has pressure sensor (16), pressure sensor (16) is arranged in to slider three (14), the coaxial rigid coupling of dancer rool (20) has pivot two (21), the both ends of pivot two (21) are all rotated and are connected with slider two (5), open box (1) both sides lateral wall has logical groove (4) with slider two (5) assorted second, the second is led to the inslot (4) internal rotation and is connected with lead screw (7), slider two (5) cover is established outside lead screw (7) and is formed screw drive with lead screw (7), box (1) outer wall rigid coupling has function box (6), be equipped with the reduction gears with lead screw (7) assorted in function box (6), reduction gears includes brake motor (25) of rigid coupling bottom in function box (6), the coaxial rigid coupling of output shaft of brake motor (25) has bevel gear (26), the bevel gear I (26) is meshed with a bevel gear II (36), the bevel gear II (36) is rotatably connected with an L-shaped rod (27), the L-shaped rod (27) is rotatably connected with a support plate I (29), one side, close to the bevel gear I (26), of the support plate I (29) is fixedly connected with a bevel gear II (28), the bevel gear II (28) is meshed with the bevel gear II (36), the bevel gear II (28) is rotatably connected with the L-shaped rod (27), one end, far away from the bevel gear I (36), of the L-shaped rod (27) penetrates through the support plate I (29) and is coaxially and fixedly connected with a bevel gear III (30), the bevel gear III (30) is meshed with a bevel gear V (32), the bevel gear V (32) is coaxially and fixedly connected with a connecting shaft, the connecting shaft is rotatably connected with a support plate II (33), one end, far away from the bevel gear V (32), of the connecting shaft is coaxially and fixedly connected with a bevel gear six (34), the six bevel gears (34) are meshed with a seven bevel gear (35), and the seven bevel gears (35) are coaxially and fixedly connected with the screw rod (7).

2. The tension adjusting apparatus for a coating film according to claim 1, characterized in that: the subassembly of rectifying includes that the symmetry sets up board (18) of rectifying in box (1), the one side that board (18) of rectifying departed from mutually all articulates there is connecting rod one (23), the one end that board (18) of rectifying was kept away from in connecting rod one (23) articulates there is connecting rod two (24), the one end that connecting rod one (23) were kept away from in connecting rod two (24) is articulated with box (1) inner wall, box (1) lateral wall threaded connection has handle bolt (3), handle bolt (3) one end runs through box (1) lateral wall and rotates with board (18) of rectifying and is connected, both sides all are equipped with gyro wheel (22) about rectifying board (18).

3. The tension adjusting apparatus for a coating film according to claim 1, wherein: the box (1) internal rotation is connected with four (8) of pivot, the coaxial rigid coupling in four (8) of pivot has guide roll (19), the position and the subassembly of rectifying of guide roll (19) cooperate.

4. The tension adjusting apparatus for a coating film according to claim 1, wherein: the fifth bevel gear (32) is meshed with the fourth bevel gear (31), the fourth bevel gear (31) is rotatably connected with a circular shaft, and one end, far away from the fourth bevel gear (31), of the circular shaft is fixedly connected with the side wall of the function box (6).

5. The tension adjusting apparatus for a coating film according to claim 1, characterized in that: the two sides of the first sliding block (10), the second sliding block (5) and the third sliding block (14) are fixedly connected with limiting edges, and sliding grooves matched with the limiting edges are formed in the inner walls of the first through groove (2), the second through groove (4) and the third through groove (9).

6. The tension adjusting apparatus for a coating film according to claim 1, characterized in that: the side wall of the functional box (6) is provided with a through hole, and the position of the through hole is matched with the second through groove (4).

7. The tension adjusting apparatus for a coating film according to claim 1, characterized in that: the first support plate (29) and the second support plate (33) are fixedly connected with the inner bottom surface of the function box (6), and the bottom of the box body (1) is provided with a locking universal wheel.