CN218777554U

CN218777554U - Dolly is transported in matrimony vine processing

Info

Publication number: CN218777554U
Application number: CN202223400721.0U
Authority: CN
Inventors: 张圣; 朱珊; 张菊; 江华
Original assignee: Ningxia Shengshiqi Township Biotechnology Development Co ltd
Current assignee: Ningxia Shengshiqi Township Biotechnology Development Co ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-03-31
Anticipated expiration: 2032-12-19

Abstract

The utility model provides a medlar processing and transferring trolley, belonging to the medlar transferring technical field, which solves the problem that the material tray is inconvenient to be placed on the top of the trolley, and the labor and the trouble are wasted when the material tray is placed by the working personnel; the existing transfer trolley is inconvenient to fix after moving; comprises a base; four groups of support columns are fixedly arranged at the top of the base, and a top plate is fixedly arranged at the top of each support column; a supporting device is arranged between the two groups of supporting columns in a sliding manner, an auxiliary mechanism is arranged on the inner side of the supporting device in a sliding manner, and a locking mechanism is fixedly arranged on the outer side of the supporting device; the effect that the bottom supporting frame does not move when the top supporting frame is driven to move upwards by the threaded rod and the connecting block is achieved by arranging the connecting plate A and the connecting plate B; thereby playing the role of placing the material tray step by step; the phenomenon that the material tray is not convenient to place on the top of the trolley by workers is avoided.

Description

Dolly is transported in matrimony vine processing

Technical Field

The utility model belongs to the technical field of the matrimony vine is transported, more specifically says, in particular to dolly is transported in matrimony vine processing.

Background

In the sorting process of the fresh medlar, the sorted fresh medlar needs to be palletized and transported to a drying device or a storage place.

The existing transfer trolley mostly adopts a multi-layer stacking mode to transport the material trays, so that the phenomenon that the material trays are inconvenient to place at the top of the trolley can occur, and the labor and the trouble are wasted when the material trays are placed by workers; and current transportation dolly is not convenient for fix it after removing to when loading and unloading charging tray, the phenomenon that the position removed can appear in the dolly, reduced the practicality of transporting the dolly.

Therefore, in view of this, research and improvement are made to the existing structure and deficiency, and a wolfberry processing and transporting trolley is provided, so as to achieve the purpose of having more practical value.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides a medlar processing and transferring trolley, which aims to solve the problem that the phenomenon that a material tray is inconvenient to place on the top of the trolley possibly occurs in the background technology, so that the work personnel takes trouble and labor when placing the material tray; and the existing transfer trolley is inconvenient to fix after moving.

The utility model relates to a purpose and efficiency of dolly are transported in matrimony vine processing reaches by following concrete technical means:

a kind of matrimony vine processing transports the dolly, including the base; four groups of universal wheels are fixedly arranged at the bottom of the base, and a fixing mechanism is fixedly arranged at the bottom of the base; four groups of support columns are fixedly arranged at the top of the base, trapezoidal grooves are formed in the support columns, and the two groups of support columns are symmetrically arranged; a top plate is fixedly arranged at the top of the supporting column; a supporting device is arranged between the two groups of supporting columns in a sliding mode, an auxiliary mechanism is arranged on the inner side of the supporting device in a sliding mode, and a locking mechanism is fixedly arranged on the outer side of the supporting device.

Furthermore, threaded rods are rotatably arranged between the inner part of the base and the inner part of the top plate, the number of the threaded rods is two, and a bevel gear is fixedly arranged at the top end of one group of threaded rods; the top of the top plate is fixedly provided with a motor device, the shaft end of the motor device is fixedly provided with a bevel gear A, and the bevel gear A is meshed with a bevel gear at the top end of the threaded rod; the outer side of the top of the threaded rod is fixedly provided with synchronizing wheels A, the number of the synchronizing wheels A is two, and a synchronous belt is arranged between the two groups of the synchronizing wheels A; the outer side of the threaded rod is provided with a connecting block through threaded connection.

Further, the fixing mechanism includes: the fixing frame, the double-head screw, the synchronizing wheel B, the sliding block, the rotating plate, the bottom plate and the nail body are arranged on the base; the fixed frame is fixedly arranged at the bottom of the base; the outer side of the double-end screw is provided with a bearing in a matching way, and the bearing is arranged in the fixed frame in a matching way; the number of the double-end screws is two, and the top ends of the double-end screws are fixedly provided with hand wheels; the number of the synchronous wheels B is two, the two groups of synchronous wheels B are respectively and fixedly arranged at the outer sides of the two groups of double-headed screws, and a synchronous belt is arranged between the two groups of synchronous wheels B; the sliding block is arranged on the outer side of the double-threaded screw in a threaded connection manner, and the sliding block is arranged in the fixing frame in a sliding manner; the rotating plates are rotatably arranged at the bottoms of the sliding blocks, the number of the rotating plates is four, and the two groups of the rotating plates are symmetrically arranged; the bottom plate is rotatably arranged between the bottoms of the four groups of rotating plates; the nail body is fixedly arranged at the bottom of the bottom plate and is arranged in a linear arrangement.

Further, the supporting device includes: the supporting frame, the transverse plate, the connecting plate A and the connecting plate B are arranged on the supporting frame; a trapezoidal block is fixedly arranged on the outer side of the support frame, the trapezoidal block is arranged on the inner side of the trapezoidal groove in the support column in a sliding manner, and the support frame is arranged between the two groups of support columns in a sliding manner; the supporting frames are arranged in a linear mode and are symmetrically arranged relative to the base, and the outer side of the top supporting frame is fixedly provided with a connecting block; the transverse plate is fixedly arranged between the two groups of supporting frames; the connecting plate A is rotatably arranged on the outer side of the group of supporting frames; the connecting plate B is rotatably arranged on the outer side of the other group of supporting frames, and the connecting plate B is rotatably connected with the connecting plate A.

Further, the assist mechanism includes: a material tray and a handle; the material tray is arranged between the two groups of support frames in a sliding manner, the rear side of the material tray is attached to the front side of the transverse plate, and the material trays are arranged in a linear manner; the handle is fixedly arranged on the front side of the material tray.

Further, the locking mechanism includes: the locking frame, the connecting frame, the cross rod, the baffle and the self-locking block; the locking frame is fixedly arranged on the front side of the supporting frame, and the locking frame main body is of a U-shaped structure; the connecting frame is fixedly arranged on the outer side of the locking frame; the cross rod is arranged in the connecting frame in a sliding manner, and a spring part is arranged between the top end of the cross rod and the inner side of the connecting frame; the baffle is fixedly arranged at the rear end of the cross rod, and the outer side of the baffle is attached to the outer side of the connecting frame; the self-locking block is fixedly arranged at the top end of the cross rod, the front side of the self-locking block is of a bevel edge structure, and the straight edge at the rear side of the self-locking block is attached to the front side of the material tray.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. in the utility model, the connecting plate A and the connecting plate B are arranged, so that the effect of making the bottom supporting frame not move when the top supporting frame is driven to move upwards by the threaded rod and the connecting block is realized; the purpose that the top supporting frame drives the bottom supporting frame to move upwards when the connecting plate A and the connecting plate B are in a vertical state is achieved; thereby playing the role of placing the material tray step by step; the phenomenon that the charging tray is not convenient to place on the top of the trolley by workers is avoided.

2. In the utility model, the front bevel edge of the self-locking block is arranged, so that the self-locking block automatically slides into the locking frame through the front bevel edge when the material tray is pushed inwards; through the spring part and the cross rod, the effect of automatically resetting the self-locking block is realized when the rear side of the material tray is attached to the front side of the transverse plate; the straight edge of the rear side of the self-locking block is attached to the front side of the material tray, so that the material tray is effectively fixed; the effect of the phenomenon that the charging tray falls when in transfer is prevented.

3. The utility model discloses in, through being provided with double-end screw, realized making two sets of sliding blocks drive two sets of rotor plates effect of opposite direction rotation simultaneously, played light convenient messenger's bottom plate and driven the nail body and reciprocate and insert underground effect, can be more simple and convenient fix it after the dolly removes, strengthened the practicality of transporting the dolly.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural view of the lower surface of the base of the present invention.

Fig. 3 is a schematic structural diagram of the fixing mechanism of the present invention.

Fig. 4 is a schematic structural diagram of the upper surface of the base of the present invention.

Fig. 5 is a schematic structural view of the supporting device of the present invention.

Fig. 6 is a schematic structural view of the locking mechanism of the present invention.

In the drawings, the corresponding relationship between the component names and the reference numbers is as follows:

1. a base; 101. a universal wheel; 102. a support pillar; 103. a top plate; 104. a threaded rod; 105. a bevel gear A; 106. a synchronous wheel A; 107. a joining block;

2. a fixing mechanism; 201. a fixed mount; 202. a double-ended screw; 2021. a synchronizing wheel B; 203. a slider; 204. a rotating plate; 205. a base plate; 206. a nail body;

3. a support device; 301. a support frame; 302. a transverse plate; 303. a connecting plate A; 304. a connecting plate B;

4. an auxiliary mechanism; 401. a material tray; 402. a handle;

5. a locking mechanism; 501. a locking frame; 502. a connecting frame; 503. a cross bar; 504. a baffle plate; 505. self-locking block.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," 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 "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

The embodiment is as follows:

as shown in figures 1 to 6:

the utility model provides a medlar processing and transferring trolley, which comprises a base 1; four groups of universal wheels 101 are fixedly arranged at the bottom of the base 1, and a fixing mechanism 2 is fixedly arranged at the bottom of the base 1; the fixing mechanism 2 includes: the fixing frame 201, the double-head screw 202, the synchronizing wheel B2021, the sliding block 203, the rotating plate 204, the bottom plate 205 and the nail body 206; the fixing frame 201 is fixedly arranged at the bottom of the base 1; the outer side of the double-end screw 202 is provided with a bearing in a matching way, and the bearing is arranged in the fixed frame 201 in a matching way; the number of the double-threaded screws 202 is two, and the top ends of the double-threaded screws 202 are fixedly provided with hand wheels; the number of the synchronizing wheels B2021 is two, the two groups of synchronizing wheels B2021 are respectively and fixedly arranged at the outer sides of the two groups of double-headed screws 202, and a synchronizing belt is arranged between the two groups of synchronizing wheels B2021; the sliding block 203 is arranged outside the double-threaded screw 202 through threaded connection, and the sliding block 203 is arranged inside the fixed frame 201 in a sliding manner; the rotating plates 204 are rotatably arranged at the bottom of the sliding block 203, the number of the rotating plates 204 is four, and the two groups of the rotating plates 204 are symmetrically arranged; the bottom plate 205 is rotatably arranged between the bottoms of the four groups of rotating plates 204; the nail bodies 206 are fixedly arranged at the bottom of the bottom plate 205, and the nail bodies 206 are arranged in a linear arrangement; the concrete functions are as follows: by arranging the double-head screw 202, the effect that the two groups of sliding blocks 203 drive the two groups of rotating plates 204 to rotate in opposite directions is achieved, the effect that the bottom plate 205 drives the nail body 206 to move up and down and insert underground is achieved easily and conveniently, and the trolley can be fixed after moving more conveniently; four groups of supporting columns 102 are fixedly arranged at the top of the base 1, trapezoidal grooves are formed in the supporting columns 102, and two groups of supporting columns 102 are symmetrically arranged; a top plate 103 is fixedly arranged at the top of the supporting column 102; a support device 3 is arranged between the two groups of support columns 102 in a sliding manner, an auxiliary mechanism 4 is arranged on the inner side of the support device 3 in a sliding manner, and a locking mechanism 5 is fixedly arranged on the outer side of the support device 3; the assist mechanism 4 includes: a tray 401 and a handle 402; the material tray 401 is arranged between the two groups of supporting frames 301 in a sliding manner, the rear side of the material tray 401 is attached to the front side of the transverse plate 302, and the material trays 401 are arranged in a linear manner; the handle 402 is fixed to the front side of the tray 401.

As shown in fig. 1 and 4, threaded rods 104 are rotatably arranged between the inside of the base 1 and the inside of the top plate 103, the number of the threaded rods 104 is two, and a bevel gear is fixedly arranged at the top end of one group of the threaded rods 104; a motor device is fixedly arranged at the top of the top plate 103, a bevel gear A105 is fixedly arranged at the shaft end of the motor device, and the bevel gear A105 is meshed with a bevel gear at the top end of the threaded rod 104; the outer side of the top of the threaded rod 104 is fixedly provided with synchronizing wheels A106, the number of the synchronizing wheels A106 is two, and a synchronous belt is arranged between the two groups of synchronizing wheels A106; the outer side of the threaded rod 104 is provided with a connecting block 107 through threaded connection; the concrete functions are as follows: by arranging the connecting plate A303 and the connecting plate B304, the effect that the bottom support frame 301 does not move when the top support frame 301 is driven to move upwards by the threaded rod 104 and the connecting block 107 is achieved; thereby playing the role of placing the charging tray 401 stage by stage; the phenomenon that the charging tray 401 is not conveniently placed on the top of the trolley by workers is avoided.

As shown in fig. 4 and 5, the supporting device 3 includes: the supporting frame 301, the transverse plate 302, the connecting plate A303 and the connecting plate B304; a trapezoidal block is fixedly arranged on the outer side of the support frame 301, the trapezoidal block is arranged on the inner side of a trapezoidal groove in each support column 102 in a sliding manner, and the support frame 301 is arranged between the two groups of support columns 102 in a sliding manner; the supporting frames 301 are arranged in a straight line, the supporting frames 301 are symmetrically arranged relative to the base 1, and the outer side of the top supporting frame 301 is fixedly provided with a connecting block 107; the transverse plate 302 is fixedly arranged between the two groups of support frames 301; the connecting plate A303 is rotatably arranged at the outer side of the group of supporting frames 301; the connecting plate B304 is rotatably arranged on the outer side of the other group of supporting frames 301, and the connecting plate B304 is rotatably connected with the connecting plate A303; the concrete functions are as follows: by arranging the connecting plate A303 and the connecting plate B304, the effect of enabling the bottom support frame 301 not to move when the top support frame 301 is driven to move upwards by the threaded rod 104 and the connecting block 107 is achieved; the purpose that when the connecting plate A303 and the connecting plate B304 are in a vertical state, the top supporting frame 301 drives the bottom supporting frame 301 to move upwards is achieved; thereby playing the role of placing the charging tray 401 stage by stage; the phenomenon that the charging tray 401 is not convenient to place on the top of the trolley by workers is avoided.

As shown in fig. 5 and 6, the lock mechanism 5 includes: a locking frame 501, a connecting frame 502, a cross bar 503, a baffle 504 and a self-locking block 505; the locking frame 501 is fixedly arranged on the front side of the supporting frame 301, and the main body of the locking frame 501 is of a U-shaped structure; the connecting frame 502 is fixedly arranged at the outer side of the locking frame 501; the cross rod 503 is slidably arranged inside the connecting frame 502, and a spring member is arranged between the top end of the cross rod 503 and the inner side of the connecting frame 502; the baffle 504 is fixedly arranged at the rear end of the cross rod 503, and the outer side of the baffle 504 is attached to the outer side of the connecting frame 502; the self-locking block 505 is fixedly arranged at the top end of the cross rod 503, the front side of the self-locking block 505 is provided with a bevel edge structure, and the straight edge at the rear side of the self-locking block 505 is attached to the front side of the tray 401; the concrete functions are as follows: by arranging the front oblique edge of the self-locking block 505, the effect that the self-locking block 505 automatically slides into the locking frame 501 through the front oblique edge when the tray 401 is pushed inwards is achieved; the spring element and the cross rod 503 realize the effect of automatically resetting the self-locking block 505 when the rear side of the tray 401 is attached to the front side of the transverse plate 302; the purpose that the straight edge at the rear side of the self-locking block 505 is attached to the front side of the material tray 401 so as to effectively fix the material tray 401 is achieved; the effect of preventing the phenomenon that the charging tray 401 falls when in transportation is achieved.

The specific use mode and function of the embodiment are as follows:

in the utility model, the trolley is moved by the universal wheel 101 when in use, when the trolley moves to a designated position, one group of the double-head screws 202 are rotated, and the two groups of the double-head screws 202 are matched with the synchronous belt to rotate simultaneously by the synchronous wheel B2021; the double-end screw 202 drives the two groups of rotating plates 204 to rotate in opposite directions through the two groups of sliding blocks 203, so that the bottom plate 205 drives the nail body 206 to move downwards, the nail body 206 is inserted into the ground, and the trolley is fixed; the trolley can be more conveniently fixed after moving, and the phenomenon that the trolley moves when a charging tray 401 is loaded and unloaded is favorably avoided; pushing a set of trays 401 between the inner sides of the two sets of topmost supporting frames 301; so that the tray 401 extrudes the self-locking block 505, and the self-locking block 505 slides into the locking frame 501 through the front oblique edge; when the rear side of the tray 401 is attached to the front side of the transverse plate 302, the spring part drives the self-locking block 505 to slide forwards through the transverse rod 503, so that the straight edge of the rear side of the self-locking block 505 is attached to the front side of the tray 401, and the tray 401 is fixed; the motor device is started to drive the bevel gear A105 to rotate under the action of preventing the charging tray 401 from falling during transferring, the bevel gear A105 drives the set of threaded rods 104 to rotate through the bevel gears at the top ends of the threaded rods 104, and the two sets of threaded rods 104 rotate simultaneously through the cooperation of the synchronizing wheel A106 and the synchronizing belt, so that the two sets of threaded rods 104 drive the topmost supporting frame 301 and the charging tray 401 to move upwards through the connecting block 107; when the connecting plate A303 and the connecting plate B304 are in a vertical state, the topmost supporting frame 301 drives the supporting frame 301 below the topmost supporting frame to move upwards, so that the material tray 401 is placed step by step; be favorable to avoiding appearing the phenomenon that the staff is not convenient for place charging tray 401 in dolly top, strengthened the practicality of transporting the dolly.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. The utility model provides a dolly is transported in matrimony vine processing which characterized in that includes: a base (1); four groups of universal wheels (101) are fixedly arranged at the bottom of the base (1), and a fixing mechanism (2) is fixedly arranged at the bottom of the base (1); four groups of supporting columns (102) are fixedly arranged at the top of the base (1), trapezoidal grooves are formed in the supporting columns (102), and the two groups of supporting columns (102) are symmetrically arranged; a top plate (103) is fixedly arranged at the top of the supporting column (102); a supporting device (3) is arranged between the two groups of supporting columns (102) in a sliding mode, an auxiliary mechanism (4) is arranged on the inner side of the supporting device (3) in a sliding mode, and a locking mechanism (5) is fixedly arranged on the outer side of the supporting device (3).

2. The wolfberry processing and transferring trolley according to claim 1, wherein: threaded rods (104) are rotatably arranged between the inner part of the base (1) and the inner part of the top plate (103), the number of the threaded rods (104) is two, and a bevel gear is fixedly arranged at the top end of one group of the threaded rods (104); the top of the top plate (103) is fixedly provided with a motor device, the shaft end of the motor device is fixedly provided with a bevel gear A (105), and the bevel gear A (105) is meshed with a bevel gear at the top end of the threaded rod (104); the outer side of the top of the threaded rod (104) is fixedly provided with synchronizing wheels A (106), the number of the synchronizing wheels A (106) is two, and a synchronous belt is arranged between the two groups of synchronizing wheels A (106); the outer side of the threaded rod (104) is provided with a connecting block (107) through threaded connection.

3. The wolfberry processing and transferring trolley according to claim 1, wherein: the fixing mechanism (2) comprises: the device comprises a fixed frame (201), a double-thread screw (202), a synchronizing wheel B (2021), a sliding block (203), a rotating plate (204), a bottom plate (205) and a nail body (206); the fixing frame (201) is fixedly arranged at the bottom of the base (1); the outer side of the double-end screw (202) is provided with a bearing in a matching way, and the bearing is arranged in the fixed frame (201) in a matching way; the number of the double-threaded screws (202) is two, and the top ends of the double-threaded screws (202) are fixedly provided with hand wheels; the number of the synchronizing wheels B (2021) is two, the two groups of synchronizing wheels B (2021) are respectively and fixedly arranged at the outer sides of the two groups of double-head screws (202), and a synchronous belt is arranged between the two groups of synchronizing wheels B (2021); the sliding block (203) is arranged on the outer side of the double-thread screw (202) in a threaded connection mode, and the sliding block (203) is arranged in the fixed frame (201) in a sliding mode; the rotating plates (204) are rotatably arranged at the bottom of the sliding block (203), the number of the rotating plates (204) is four, and the two groups of the rotating plates (204) are symmetrically arranged; the bottom plate (205) is rotatably arranged between the bottoms of the four groups of rotating plates (204); the nail bodies (206) are fixedly arranged at the bottom of the bottom plate (205), and the nail bodies (206) are arranged in a linear manner.

4. The transportation trolley for processing medlar according to claim 2, wherein: the support device (3) comprises: the device comprises a support frame (301), a transverse plate (302), a connecting plate A (303) and a connecting plate B (304); a trapezoidal block is fixedly arranged on the outer side of the support frame (301), the trapezoidal block is arranged on the inner side of a trapezoidal groove in each support column (102) in a sliding manner, and the support frame (301) is arranged between the two groups of support columns (102) in a sliding manner; the supporting frames (301) are arranged in a linear mode, the supporting frames (301) are symmetrically arranged relative to the base (1), and the outer side of the top supporting frame (301) is fixedly provided with a connecting block (107); the transverse plate (302) is fixedly arranged between the two groups of supporting frames (301); the connecting plate A (303) is rotatably arranged at the outer side of the group of supporting frames (301); the connecting plate B (304) is rotatably arranged on the outer side of the other group of supporting frames (301), and the connecting plate B (304) is rotatably connected with the connecting plate A (303).

5. The wolfberry processing and transporting trolley as claimed in claim 4, wherein: the auxiliary mechanism (4) comprises: a tray (401) and a handle (402); the material tray (401) is arranged between the two groups of supporting frames (301) in a sliding manner, the rear side of the material tray (401) is attached to the front side of the transverse plate (302), and the material tray (401) is arranged in a linear manner; the handle (402) is fixedly arranged on the front side of the tray (401).

6. The transportation trolley for processing medlar according to claim 5, wherein: the locking mechanism (5) comprises: the device comprises a locking frame (501), a connecting frame (502), a cross bar (503), a baffle (504) and a self-locking block (505); the locking frame (501) is fixedly arranged on the front side of the support frame (301), and the main body of the locking frame (501) is of a U-shaped structure; the connecting frame (502) is fixedly arranged at the outer side of the locking frame (501); the cross rod (503) is arranged inside the connecting frame (502) in a sliding mode, and a spring piece is arranged between the top end of the cross rod (503) and the inner side of the connecting frame (502); the baffle (504) is fixedly arranged at the rear end of the cross rod (503), and the outer side of the baffle (504) is attached to the outer side of the connecting frame (502); the self-locking block (505) is fixedly arranged at the top end of the cross rod (503), the front side of the self-locking block (505) is of a bevel edge structure, and the straight edge of the rear side of the self-locking block (505) is attached to the front side of the material tray (401).