Material bin cover replacing device and material bin

Abstract

The utility model discloses a material bin cover changing device and a material bin, the material bin comprises a first material bin with a cover body and a second material bin to be provided with the cover body, the material bin cover changing device comprises a rack, a first station used for placing the first material bin, and a second station used for placing the second material bin, the cover replacing mechanism is used for dismounting a cover body of the first material bin and mounting the cover body on the second material bin; the first station and the second station are arranged at the bottom of the machine frame, and the cover replacing mechanism is arranged on the machine frame and located above the first station and the second station. The utility model further discloses a material bin cover replacing method applied to the material bin cover replacing device. The first material bin with the cover body is placed on the first station, the second material bin to be provided with the cover body is placed on the second station, then the cover body of the first material bin is detached through the cover replacing mechanism and installed on the second material bin, replacement operation of the cover bodies of the material bins is completed, automatic operation can be achieved, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of material transfer, in particular to a material bin cover changing device and a material bin. Background Art

[0002] The main raw material used in the powder metallurgy industry is tungsten carbide powder. The preparation process of tungsten carbide powder often requires transportation between different processes and loading and unloading between different equipment.

[0003] During the transportation or loading and unloading process of tungsten carbide powder, a material bin needs to be set up at the discharge port to receive the material. When the material bin is full, the material bin needs to be installed with a cover and sent to the designated location of the next process. Then the cover of other empty material bins is removed and sent to the discharge port of the material conveying equipment for receiving the material to ensure continuous production.

[0004] With the advancement of artificial intelligence, the circulation and loading and unloading of materials are mostly replaced by AGVs instead of manual operations, and various actions are integrated through signal transmission. At present, during the process of feeding materials from the material bin loaded by the AGV and replacing the empty material bin, the installation or removal of the material bin cover still needs to be completed manually, and automatic operation cannot be achieved. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a material bin cover replacement device and a material bin, which can improve the automation of replacing the material bin cover body of the material bin.

[0006] A material bin cover changing device, the material bin comprises a first material bin with a cover body and a second material bin to be installed with the cover body, comprises a frame, a station one for placing the first material bin, a station two for placing the second material bin, and a cover changing mechanism for removing the cover body of the first material bin and installing it on the second material bin; the station one and the station two are at the bottom of the frame, and the cover changing mechanism is arranged on the frame and located above the station one and the station two.

[0007] As a further improvement of the above technical solution:

[0008] The workstation one and the workstation two are arranged side by side, and the cover changing mechanism includes a suction cup for installing or removing the material bin cover, a translation module for controlling the translation of the suction cup between the workstation one and the workstation two, and a lifting cylinder for controlling the lifting of the suction cup; the translation module is arranged on the top of the frame and above the workstation one and the workstation two, the lifting cylinder is slidably connected to the translation module, and the suction cup is arranged at the end of the telescopic rod of the lifting cylinder.

[0009] Both the workstation one and the workstation two are provided with an AGV trolley travel area for the AGV trolley to transfer the material bin to the workstation; the first support plate and the second support plate for supporting the material bin are provided on both sides of the AGV trolley travel area; the first support plate and the second support plate are fixedly connected to the bottom of the frame and supported on the ground.

[0010] Both station one and station two are provided with a positioning mechanism for moving the material bin in the station so that the cover mounting part of the material bin is located directly below the translation module; the positioning mechanism is arranged on the first support plate and the second support plate; the positioning mechanism includes a transverse positioning mechanism for controlling the movement of the material bin in a direction parallel to the length of the translation module, and a longitudinal positioning mechanism for controlling the movement of the material bin in a direction perpendicular to the length of the translation module.

[0011] The transverse positioning mechanism includes a transverse movable plate, a transverse driving cylinder, a fixed plate and a first limiter for limiting the transverse direction of the material bin, the first support plate is provided with a transverse guide rail parallel to the length of the translation module, the transverse movable plate is slidably connected to the first support plate through the transverse guide rail; a first abutment block for acting on the material bin is fixed on the transverse movable plate, the cylinder body of the transverse driving cylinder is fixedly arranged on the first support plate, the telescopic direction of its telescopic rod is parallel to the length direction of the translation module, and the telescopic rod is connected to the first abutment block;

[0012] The second support plate is provided with a heightening block, the fixed plate is fixedly connected to the heightening block, and the upper surface of the fixed plate is at the same height as the upper surface of the transverse movable plate; the first limit member is provided with two groups, distributed at both ends of the length direction of the fixed plate, and fixedly connected to the second support plate.

[0013] The longitudinal positioning mechanism includes a longitudinal drive cylinder, a second abutment block and a second limit piece for limiting the longitudinal direction of the material bin; the longitudinal drive cylinder is provided with two groups, which are respectively arranged on the first support plate and the second support plate; the cylinder body of the longitudinal drive cylinder is fixed on the first support plate or the second support plate, and the telescopic direction of its telescopic rod is perpendicular to the length direction of the translation module, and the second abutment block is fixedly connected to the end of the telescopic rod of the longitudinal drive cylinder; the second limit piece is provided with two groups, which are respectively fixed on the first support plate or the second support plate; the second limit piece and the second abutment block are relatively arranged on both sides of the length direction of the transverse movable plate or the fixed plate.

[0014] A first steel roller is arranged on the first limiting member, and a second steel roller is hingedly arranged on the second limiting member. The central axes of the first steel roller and the second steel roller are arranged perpendicular to each other, and the central axis of the first steel roller is arranged perpendicular to the length direction of the translation module; a plurality of third steel rollers are hingedly arranged on the transverse movable plate and the fixed plate, and the central axes of the third steel rollers are arranged parallel to the central axes of the second steel rollers.

[0015] A control system is also provided for controlling the positioning mechanism and the cover changing mechanism to automatically act to complete the cover changing operation, and the control system is connected with the positioning mechanism and the cover changing mechanism by signal.

[0016] A material bin applied to the above-mentioned material bin cover changing device comprises a support base, a bin body and a cover body; the support base is a rectangular frame structure, comprising four vertical legs distributed in a rectangular array; a horizontal longitudinal rod for being placed on a first support plate or a second support plate is provided at the bottom of the vertical legs, and a horizontal cross bar is also provided between the vertical legs; the vertical legs, the horizontal longitudinal rod and the horizontal cross bar are all of rectangular cross sections, and the bottom surface of the horizontal cross bar is higher than the bottom surface of the horizontal longitudinal rod.

[0017] As a further improvement of the above technical solution:

[0018] A feed port is arranged on the top of the bin body, and the cover body is sleeved on the feed port; a suction plane for forming a suction connection with a suction cup is arranged in the middle of the cover body.

[0019] Compared with the prior art, the advantages of the utility model are:

[0020] The utility model proposes a material bin cover replacing device, which is provided with a first station, a second station and a cover replacing mechanism. The first material bin with a cover is placed at the first station, the second material bin to be equipped with a cover is placed at the second station, and the cover of the first material bin is removed by the cover replacing mechanism and installed on the second material bin, thereby completing the replacement operation of the material bin cover. This helps to realize automated operation and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural stereogram of the material bin cover changing device in the first embodiment of the device.

[0022] Figure 2 It is a schematic structural front view of the material bin cover changing device in the first embodiment of the device.

[0023] Figure 3 It is a schematic top view of the structure of the material bin cover changing device in the first embodiment of the device.

[0024] Figure 4 yes Figure 1 Enlarged view of point A in the middle.

[0025] Figure 5 It is a schematic structural stereogram of the material bin in the second embodiment of the device.

[0026] Figure 6 It is a schematic top view of the structure of the material bin in the second embodiment of the device.

[0027] Figure 7 It is a schematic front view of the structure of the material bin in the second embodiment of the device.

[0028] Figure 8 yes Figure 7 Cross-sectional view along BB direction.

[0029] The symbols in the figure represent:

[0030] 1. Rack; 2. Cover changing mechanism; 21. Suction cup; 22. Translation module; 23. Lifting cylinder; 11. Station 1; 12. Station 2; 13. AGV trolley travel area; 14. First support plate; 141. Transverse guide rail; 15. Second support plate; 151. Heightening block; 3. Transverse positioning mechanism; 31. Transverse movable plate; 32. Transverse drive cylinder; 33. Fixed plate; 34. First limiter; 3 41. First steel roller; 35. First abutment block; 4. Longitudinal positioning mechanism; 41. Longitudinal drive cylinder; 42. Second abutment block; 43. Second limiter; 431. Second steel roller; 44. Third steel roller; 51. Support base; 511. Vertical legs; 512. Horizontal longitudinal rod; 513. Horizontal cross rod; 52. Bin body; 53. Cover body; 531. Adsorption plane; 6. Control system; 7. Ground. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] Device embodiment 1:

[0033] like Figures 1 to 4 As shown, the material bin cover changing device of this embodiment includes a first material bin with a cover body 53 and a second material bin to be installed with the cover body 53, including a frame 1, a station 11 for placing the first material bin, a station 2 12 for placing the second material bin, and a cover changing mechanism 2 for removing the cover body 53 of the first material bin and installing it on the second material bin; the station 1 11 and the station 2 12 are at the bottom of the frame 1, and the cover changing mechanism 2 is arranged on the frame 1 and above the station 1 11 and the station 2 12. Specifically, the frame 1 includes hollow pipes to facilitate concealing various lines. In this structure, a workstation 1 11, a workstation 2 12 and a cover changing mechanism 2 are provided. By placing a first material bin with a cover body 53 at the workstation 1 11, and placing a second material bin to be equipped with the cover body 53 at the workstation 2 12, and then removing the cover body 53 of the first material bin through the cover changing mechanism 2 and installing it on the second material bin, the replacement operation of the material bin cover is completed, which helps to realize automated operation and improve production efficiency.

[0034] In this embodiment, station 1 11 and station 2 12 are arranged side by side, and the cover changing mechanism 2 includes a suction cup 21 for installing or removing the material bin cover, a translation module 22 for controlling the translation of the suction cup 21 between station 1 11 and station 2 12, and a lifting cylinder 23 for controlling the lifting of the suction cup 21; the translation module 22 is arranged at the top of the frame 1 and is located above station 1 11 and station 2 12, the lifting cylinder 23 is slidably connected to the translation module 22, and the control suction cup 21 is arranged at the end of the telescopic rod of the lifting cylinder 23. Specifically, the translation module 22 can achieve precise positioning by controlling the program in the control system 6. The suction cup 21 is made of rubber material, and a pressure relief component is arranged in the suction cup 21, which is convenient for removal after the second material bin cover is installed.

[0035] In this embodiment, both the workstation 1 11 and the workstation 2 12 are provided with an AGV trolley travel area 13 for the AGV trolley to transfer the material bin to the workstation; the first support plate 14 and the second support plate 15 for supporting the material bin are provided on both sides of the AGV trolley travel area 13; the first support plate 14 and the second support plate 15 are both fixedly connected to the bottom of the frame 1 perpendicular to the length direction of the translation module 22 and supported on the ground 7. Through this structure, the AVG trolley can carry the material bin, raise the fork frame supporting the material bin and then enter, enter the workstation from the AGV trolley travel area 13, sink the fork frame, so that the material bin is supported on the first support plate 14 and the second support plate 15, and the AGV trolley can retreat to exit the workstation.

[0036] In this embodiment, both the station 1 11 and the station 2 12 are provided with a positioning mechanism for moving the material bin in the station so that the mounting portion of the cover 53 of the material bin is located directly below the translation module 22; the positioning mechanism is arranged on the first support plate 14 and the second support plate 15; the positioning mechanism includes a transverse positioning mechanism 3 for controlling the movement of the material bin in a direction parallel to the length of the translation module 22, and a longitudinal positioning mechanism 4 for controlling the movement of the material bin in a direction perpendicular to the length of the translation module 22. In this structure, the material bin is positioned transversely and longitudinally by the positioning mechanism, which facilitates the translation module 22 to operate under the running path set by the program, improves the automation of the operation and ensures the stability of the cover replacement operation.

[0037] In this embodiment, the transverse positioning mechanism 3 includes a transverse movable plate 31, a transverse driving cylinder 32, a fixed plate 33 and a first limit piece 34 for limiting the transverse direction of the material bin. The first support plate 14 is provided with a transverse guide rail 141 distributed parallel to the length of the translation module 22, and the transverse movable plate 31 is slidably connected to the first support plate 14 through the transverse guide rail 141; a first abutment block 35 for acting on the material bin is fixed on the transverse movable plate 31, the cylinder body of the transverse driving cylinder 32 is fixedly arranged on the first support plate 14, and the telescopic direction of its telescopic rod is parallel to the length direction of the translation module 22, and the telescopic rod is connected to the first abutment block 35; an increasing block 151 is arranged on the second support plate 15, and the fixed plate 33 is fixedly connected to the second support plate 15 by the upper surface of the increasing block 151 and the upper surface of the transverse movable plate 31 being in the same horizontal plane; the first limit piece 34 is provided with two groups, distributed at both ends of the length direction of the fixed plate 33, and fixedly connected to the second support plate 15. In this structure, after the material bin is supported on the first support plate 14 and the second support plate 15, the material bin is pushed horizontally by the transverse drive cylinder 32 until the material bin abuts against the first limit member 34 to complete the transverse positioning.

[0038] In this embodiment, the longitudinal positioning mechanism 4 includes a longitudinal drive cylinder 41, a second abutment block 42 and a second stopper 43 for limiting the longitudinal direction of the material bin; the longitudinal drive cylinder 41 is provided with two groups, which are respectively provided on the first support plate 14 and the second support plate 15; the cylinder body of the longitudinal drive cylinder 41 is fixed on the first support plate 14 or the second support plate 15, and the telescopic direction of its telescopic rod is provided perpendicular to the length direction of the translation module 22, and the second stopper 42 is fixedly connected to the end of the telescopic rod of the longitudinal drive cylinder 41; the second stopper 43 is provided with two groups, which are respectively fixed on the first support plate 14 or the second support plate 15; the second stopper 43 and the second stopper 42 are relatively provided on both sides of the length direction of the transverse movable plate 31 or the fixed plate 33. In this structure, the longitudinal positioning is completed by pushing the material bin against the second stopper 43 through the longitudinal drive cylinder 41.

[0039] In this embodiment, a first steel roller 341 is provided on the first limiting member 34, and a second steel roller 431 is hingedly provided on the second limiting member 43. The central axes of the first steel roller and the second steel roller 431 are perpendicular to each other, and the central axis of the first steel roller 341 is perpendicular to the length direction of the translation module 22; a plurality of third steel rollers 44 are hingedly provided on the transverse movable plate 31 and the fixed plate 33, and the central axis of the third steel roller 44 is parallel to the central axis of the second steel roller 431.

[0040] In this embodiment, a control system 6 is also provided for controlling the positioning mechanism and the cap changing mechanism 2 to automatically function and complete the cap changing operation. The control system 6 is signal-connected to the positioning mechanism and the cap changing mechanism 2. In this structure, the control system 6 includes: a control box, an operation interface, and a control program. The control program is a directional development and can be modified according to the actual situation.

[0041] Device embodiment 2:

[0042] like Figures 5 to 8 As shown, a material bin used in a material bin cover changing device as in the first embodiment of the device comprises a support base 51, a bin body 52 and a cover body 53; the support base 51 is a rectangular frame structure, comprising four vertical legs 511 distributed in a rectangular array; a horizontal longitudinal rod 512 for being placed on the first support plate 14 or the second support plate 15 is arranged at the bottom of the vertical legs 511, and a horizontal cross bar 513 is also arranged between the vertical legs 511, the vertical legs 511, the horizontal longitudinal rod 512 and the horizontal cross bar 513 are all rectangular in cross section, and the bottom surface of the horizontal cross bar 513 is higher than the bottom surface of the horizontal longitudinal rod 512. In this embodiment, a feed port is arranged at the top of the bin body 52, and the cover body 53 is sleeved on the feed port; a suction plane 531 capable of interacting with the suction cup 21 to form a suction connection is arranged in the middle of the cover body 53. Through this structure, the lower surface of the horizontal cross bar 513 is used to interact with the fork frame of the AVG trolley to transport and write the material bin; after the material bin is transported to the workstation with the AVG trolley, the two horizontal longitudinal bars 512 are respectively located on the transverse movable plate 31 and the fixed plate 33, and the transverse drive cylinder 32 moves transversely to the middle of the workstation until the outer side of one horizontal longitudinal bar 512 abuts against the first limit block, and the outer side of the other horizontal longitudinal bar 512 contacts the first abutment block 35 to complete the transverse positioning. The longitudinal drive cylinder 41 contacts the vertical support leg 511 through the second abutment block 42, pushing the material bin to move longitudinally until it abuts against the second limiter 43 to complete the longitudinal positioning. The setting of the third steel roller 44 improves the convenience of longitudinal displacement, and the first steel roller 341 and the second steel roller 431 improve the reliability of positioning. The cover 53 is made of stainless steel, and an adsorption plane 531 is set on the top to facilitate cooperation with the suction cup 21. The cover body 53 and the bin body 52 are sleeved together, so as to facilitate loading and unloading by means of the lifting cylinder 23 .

[0043] Method Example:

[0044] The material bin cover replacement method of this embodiment is performed using the material bin cover replacement device and the material bin in the device embodiments 1 and 2, and includes the following steps:

[0045] S1: The material bin is transported by an AGV trolley, and a vertically liftable bearing portion is provided on the AGV trolley; the bearing portion is supported at the bottom of a horizontal cross bar 513; and the central axis direction of the horizontal cross bar 513 is perpendicular to the forward direction of the AGV trolley;

[0046] S2: The bearing part is in a raised state, and after entering the AGV trolley travel area 13, it descends until the horizontal longitudinal rod 512 contacts the first support plate 14 and the second support plate 15, and the AGV trolley exits the AGV trolley travel area 13, and the material bin is left on the workstation 1 11 or the workstation 2 12;

[0047] S3: placing a first material bin with a cover body 53 to be removed on the workstation 1 11 through step S2, and placing a second material bin with a cover body 53 to be installed on the workstation 2 12;

[0048] S4: Correcting and positioning the material bin through the positioning mechanism of the material bin cover changing device;

[0049] S5: Control the lifting cylinder 23 of the cover changing mechanism 2 to move to the top of the station 1 11, and the suction cup 21 falls and acts on the cover body 53 of the first material bin, completes the cover suction and rises; the suction cup 21 is moved to the top of the station 2 12 through the translation module 22, falls and installs the cover body 53 on the second material bin, and then rises to complete the cover changing.

[0050] Specifically, the cover changing process is automatically controlled by the control program as follows: the AGV trolley runs to the empty material bin area, transfers the first material bin with the cover to the station 11, and starts the positioning program of the station 11 to correct the position of the first material bin through the positioning mechanism; after the loading weight of the second material bin reaches the requirement, the program automatically sends a transfer task signal to the AGV trolley, and after receiving the task, the AGV trolley transfers the second material bin filled with materials to the station 2 12, and starts the positioning program of the station 2 12 to correct the position of the second material bin through the positioning mechanism; the cover changing program is started, the suction cup 21 is moved to the top of the first material bin through the translation module 22, the suction cup 21 lifting cylinder 23 descends until the suction cup 21 contacts the material bin cover, completes the cover suction and rises, the suction cup 21 runs to the second material through the translation module 22 and completes the cover; after the AGV trolley transfers the empty first material bin from the station 11 to the unloading port of the equipment in this process, the AGV trolley returns to the station 2 12 to transfer the covered first material bin to the designated position. After the above actions are completed, the single task is completed. Through the design of the above structure, the whole process of replacing the material bin cover is automatically completed, and the complete AGV car unmanned operation is realized.

[0051] Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the art can use the above disclosed technical content to make many possible changes and modifications to the technical solution of the present invention without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A material bin cover changing device, the material bin comprising a first material bin with a cover body (53) and a second material bin to be equipped with the cover body (53), characterized in that: The invention comprises a frame (1), a first station (11) for placing a first material bin, a second station (12) for placing a second material bin, and a cover changing mechanism (2) for removing a cover (53) of the first material bin and installing it on the second material bin; the first station (11) and the second station (12) are at the bottom of the frame (1), and the cover changing mechanism (2) is arranged on the frame (1) and is located above the first station (11) and the second station (12).

2. The material bin cover changing device according to claim 1, characterized in that: The workstation one (11) and the workstation two (12) are arranged side by side, and the cover changing mechanism (2) comprises a suction cup (21) for installing or removing a material bin cover, a translation module (22) for controlling the translation of the suction cup (21) between the workstation one (11) and the workstation two (12), and a lifting cylinder (23) for controlling the lifting of the suction cup (21); the translation module (22) is arranged on the top of the frame (1) and above the workstation one (11) and the workstation two (12), the lifting cylinder (23) is slidably connected to the translation module (22), and the suction cup (21) is arranged at the end of the telescopic rod of the lifting cylinder (23).

3. The material bin cover changing device according to claim 1, characterized in that: Both the workstation one (11) and the workstation two (12) are provided with an AGV trolley travel area (13) for the AGV trolley to transfer the material bin to the workstation; a first support plate (14) and a second support plate (15) for supporting the material bin are provided on both sides of the AGV trolley travel area (13); the first support plate (14) and the second support plate (15) are both fixedly connected to the bottom of the frame (1) and supported on the ground (7).

4. The material bin cover changing device according to claim 3, characterized in that: Both the workstation one (11) and the workstation two (12) are provided with a positioning mechanism for moving the material bin in the workstation so that the mounting portion of the cover body (53) of the material bin is located directly below the translation module (22); the positioning mechanism is arranged on the first support plate (14) and the second support plate (15); the positioning mechanism comprises a transverse positioning mechanism (3) for controlling the movement of the material bin in a direction parallel to the length of the translation module (22), and a longitudinal positioning mechanism (4) for controlling the movement of the material bin in a direction perpendicular to the length of the translation module (22).

5. The material bin cover changing device according to claim 4, characterized in that: The transverse positioning mechanism (3) comprises a transverse movable plate (31), a transverse driving cylinder (32), a fixed plate (33) and a first limiting member (34) for limiting the transverse direction of the material bin; the first support plate (14) is provided with a transverse guide rail (141) parallel to the length of the translation module (22); the transverse movable plate (31) is slidably connected to the first support plate (14) via the transverse guide rail (141); a first abutment block (35) for acting on the material bin is fixed on the transverse movable plate (31); the cylinder body of the transverse driving cylinder (32) is fixedly arranged on the first support plate (14); the telescopic direction of its telescopic rod is parallel to the length direction of the translation module (22); the telescopic rod is connected to the first abutment block (35); The second support plate (15) is provided with a heightening block (151), the fixed plate (33) is fixedly connected to the heightening block (151), and the upper surface of the fixed plate (33) is at the same height as the upper surface of the transverse movable plate (31); the first limiter (34) is provided with two groups, which are distributed at both ends of the fixed plate (33) in the length direction and are fixedly connected to the second support plate (15).

6. The material bin cover changing device according to claim 5, characterized in that: The longitudinal positioning mechanism (4) comprises a longitudinal drive cylinder (41), a second abutment block (42) and a second limiting member (43) for limiting the longitudinal direction of the material bin; the longitudinal drive cylinder (41) is provided with two groups, which are respectively arranged on the first support plate (14) and the second support plate (15); the cylinder body of the longitudinal drive cylinder (41) is fixed on the first support plate (14) or the second support plate (15), and the telescopic direction of its telescopic rod is perpendicular to the length direction of the translation module (22); the second abutment block (42) is fixedly connected to the end of the telescopic rod of the longitudinal drive cylinder (41); the second limiting member (43) is provided with two groups, which are respectively fixed on the first support plate (14) or the second support plate (15); the second limiting member (43) and the second abutment block (42) are relatively arranged on both sides of the length direction of the transverse movable plate (31) or the fixed plate (33).

7. The material bin cover changing device according to claim 6, characterized in that: A first steel roller (341) is provided on the first limiting member (34), and a second steel roller (431) is hingedly provided on the second limiting member (43), the central axes of the first steel roller and the second steel roller (431) are perpendicular to each other, and the central axis of the first steel roller (341) is perpendicular to the length direction of the translation module (22); a plurality of third steel rollers (44) are hingedly provided on both the transverse movable plate (31) and the fixed plate (33), and the central axes of the third steel rollers (44) are parallel to the central axes of the second steel rollers (431).

8. The material bin cover changing device according to any one of claims 4 to 7, characterized in that: A control system (6) is also provided for controlling the positioning mechanism and the cover changing mechanism (2) to automatically act to complete the cover changing operation, and the control system (6) is connected to the positioning mechanism and the cover changing mechanism (2) by signals.

9. A material bin used in the material bin cover changing device according to any one of claims 3 to 8, characterized in that: The invention comprises a support base (51), a bin body (52) and a cover body (53); the support base (51) is in a rectangular frame structure, and comprises four vertical legs (511) distributed in a rectangular array; a horizontal longitudinal rod (512) for being placed on a first support plate (14) or a second support plate (15) is arranged at the bottom of the vertical legs (511); a horizontal cross rod (513) is also arranged between the vertical legs (511); the vertical legs (511), the horizontal longitudinal rod and the horizontal cross rod (513) are all in rectangular cross sections; the bottom surface of the horizontal cross rod (513) is higher than the bottom surface of the horizontal longitudinal rod (512).

10. The material bin according to claim 9, characterized in that: The bin body (52) is fixedly arranged on the upper end of the support base (51) via vertical legs (511); a feed port is arranged on the top of the bin body (52); and the cover body (53) is sleeved on the feed port; and an adsorption plane (531) for forming an adsorption connection with the suction cup (21) is arranged in the middle of the cover body (53).

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