CN222435159U - Automatic garbage cleaning device - Google Patents

Abstract

The utility model relates to the technical field of garbage cleaning equipment and discloses an automatic garbage cleaning device which comprises a mobile trolley and a cleaner main body, wherein a suction pipe with the other end positioned at the front end of the mobile trolley is communicated with the cleaner main body, the front end of the mobile trolley is provided with a swing rod and a power assembly, one end of the suction pipe far away from the cleaner main body is connected with the swing rod, a cleaning mechanism is further arranged at the front end of the mobile trolley and positioned in front of the suction pipe, the cleaning mechanism comprises a supporting assembly and a rotating roller, a plurality of brushes are fixedly connected to the surface of the rotating roller, and a transmission mechanism is further arranged between the rotating roller and the mobile trolley. The utility model has the advantages of simple use, convenient operation, good cleaning effect on fallen leaves and other garbage and high cleaning efficiency, thereby greatly reducing the effect of students on cleaning fallen leaves on the ground of a campus in autumn and winter.

Description

Automatic garbage cleaning device

Technical Field

The utility model relates to the technical field of garbage cleaning equipment, in particular to an automatic garbage cleaning device.

Background

At present, most of greening planted trees in campuses are fallen leaves, leaves fall in autumn and winter, the tree leaves are not easy to clean, a great amount of time of students is spent for processing, garbage collection is carried out, if garbage is required to be recycled, the garbage is required to be classified secondarily, secondary labor is caused, and time and labor are wasted.

The utility model of China with the prior patent publication number of CN220538529U discloses an automatic garbage sweeper, which adopts the general scheme that a first protective box is arranged between a suction pipe and a feed pipe, and teeth of a first crushing roller and teeth of a second crushing roller in the first protective box are arranged in a staggered manner, so that fallen leaves sucked by a suction cover are conveniently crushed, and smaller crushed aggregates are conveniently stored in a main body of the sweeper.

The automatic garbage sweeper has the technical defects that the position of a feeding pipe of the automatic garbage sweeper is fixed, the range of sucking fallen leaves is limited to a certain extent, the sucking effect is poor, meanwhile, part of fallen leaves or other garbage is sticky and is relatively stubborn, the automatic garbage sweeper cannot clean stubborn garbage, and the cleaning effect is poor.

Disclosure of utility model

Therefore, the utility model aims to provide an automatic garbage cleaning device, which solves the problems of poor effect of sucking garbage such as fallen leaves and the like and poor cleaning effect on stubborn garbage in the automatic garbage cleaning machine in the prior art.

The automatic garbage cleaning device comprises a mobile trolley and a cleaner main body arranged at the top of the mobile trolley, wherein the cleaner main body is communicated with a suction pipe with the other end positioned at the front end of the mobile trolley, the front end of the mobile trolley is provided with a swing rod and a power assembly for driving the swing rod to swing along the left side and the right side of the mobile trolley, one end of the suction pipe far away from the cleaner main body is connected with the swing rod, the front end of the mobile trolley is positioned in front of the suction pipe and is also provided with a cleaning mechanism, the cleaning mechanism comprises a support assembly arranged on the mobile trolley and a rotating roller rotatably arranged on the support assembly, the surface of the rotating roller is fixedly connected with a plurality of brushes, and a transmission mechanism for driving the rotating roller to rotate is further arranged between the rotating roller and the mobile trolley.

Further, the travelling car comprises a frame, a front rotating shaft and a rear rotating shaft are respectively rotatably arranged at the front end and the rear end of the bottom of the frame, rear traveling wheels are respectively fixedly connected at the two ends of the rear rotating shaft, front traveling wheels are respectively fixedly connected at the two ends of the front rotating shaft, one end of a swing rod is rotatably connected at the middle of the bottom of the frame, and the other end of the swing rod extends out of the front end of the frame to form a suspension end.

Further, a lantern ring is arranged on the surface of one end, far away from the main body of the cleaning machine, of the suction pipe, a pull rope is arranged between the lantern ring and the swing rod, and two ends of the pull rope are fixedly connected with the top of the lantern ring and the bottom of the swing rod respectively.

Further, the front rotating shaft is fixedly provided with a driving bevel gear, the power assembly comprises a rotating rod and a transmission rod, the rotating rod is rotatably arranged on one side of the bottom of the frame along the vertical direction, the bottom end of the rotating rod is fixedly provided with a driven bevel gear meshed with the driving bevel gear, the middle part of the rotating rod is provided with a protruding part formed by sinking along the horizontal direction, one end of the transmission rod is rotatably connected with the protruding part of the rotating rod, and the other end of the transmission rod is rotatably connected with the middle part of the swing rod.

Further, a guide plate is arranged at the front end of the bottom of the frame, a guide groove for a swing rod to pass through is formed in the guide plate along the width direction of the frame, and the swing rod is in sliding fit with the guide groove.

Further, the support assembly comprises a support rod fixed at the front end of the frame and a mounting shell arranged at the front end of the support rod, the rotating roller is coaxially fixed with a rotating shaft, and the rotating roller is rotatably arranged in the mounting shell through the rotating shaft.

Further, the transmission mechanism comprises a first belt wheel and a second belt wheel, the first belt wheel is fixed on the front rotating shaft, one end of the rotating shaft penetrates out of the installation shell and is fixedly connected with the second belt wheel, and a first belt is sleeved between the first belt wheel and the second belt wheel.

Further, be provided with the telescopic link between bracing piece and the installation shell, the outside cover of telescopic link is equipped with the spring, spring one end fixed connection is in the bracing piece bottom, the other end fixed connection is at the installation shell top.

Further, the cleaning machine main body comprises a collecting box arranged at the rear end of the top of the frame, an exhaust fan is arranged on one side of the top of the collecting box, a crushing mechanism is arranged in the collecting box and comprises a driving roller and a driven roller which are arranged side by side along the horizontal direction, the driving roller and the driven roller are respectively and coaxially fixed with a driving shaft and a driven shaft, the driving shaft is rotationally connected with the collecting box and the driven shaft is rotationally connected with the collecting box, and the driving shaft is respectively connected with the output end and the driven shaft of the motor in a transmission manner.

Further, a pushing handle is arranged at the rear end of the movable trolley.

The utility model has the beneficial effects that the swing rod and the suction pipe are driven by the power component to swing along the left side and the right side of the movable trolley, the suction pipe can move to suck fallen leaves, the suction effect is good, and the rotating roller and the hairbrush can be driven to rotate by the transmission mechanism, so that the garbage on the ground is cleaned, the garbage is conveniently sucked by the suction pipe, and the cleaning effect is good.

Drawings

The utility model can be further illustrated by means of non-limiting examples given in the accompanying drawings;

FIG. 1 is a schematic view of an automatic garbage cleaning device according to the present utility model;

FIG. 2 is a schematic view of the structure of FIG. 1 from another perspective;

FIG. 3 is an enlarged schematic view of the structure of FIG. 2 at A;

FIG. 4 is a partial schematic view of the bottom view of FIG. 2;

FIG. 5 is a schematic illustration of the construction of the power assembly of the present utility model;

FIG. 6 is an enlarged schematic view of the structure at B in FIG. 5;

FIG. 7 is a schematic view of a partial structure of the present utility model;

FIG. 8 is a cross-sectional view of the present utility model;

fig. 9 is an enlarged schematic view of the structure at C in fig. 8.

In the drawings, 1, a frame, 2, a rear rotating shaft, 3, a front rotating shaft, 4, a rear traveling wheel, 5, a front traveling wheel, 6, a driving bevel gear, 7, a driven bevel gear, 8, a rotating rod, 9, a transmission rod, 10, a swinging rod, 11, a guide plate, 12, a guide groove, 13, a fixed plate, 14, a supporting plate, 15, a suction pipe, 16, a collar, 17, a pulling rope, 18, a dust suction head, 19, a supporting rod, 20, a telescopic rod, 21, a spring, 22, a mounting shell, 23, a rotating shaft, 24, a rotating roller, 25, a brush, 26, a first belt wheel, 27, a first belt, 28, a second belt wheel, 29, a collecting box, 30, a motor, 31, a driving belt wheel, 32, a second belt, 33, a driven belt wheel, 34, a driving shaft, 35, a driven shaft, 36, a driving roller, 37, a driven roller, 38, a driving gear, 39, a driven gear, 40, a mounting plate, 41, a fan, 42, a crushing disc, 43, a pushing hand, 44 and a protruding part are included.

Detailed Description

The following embodiments of the present utility model are described in terms of specific examples, and those skilled in the art will appreciate the advantages and capabilities of the present utility model from the disclosure herein. It should be noted that, the illustrations provided in the following embodiments are for illustrative purposes only, and are shown in schematic drawings, not physical drawings, and are not to be construed as limiting the present utility model, and in order to better illustrate the embodiments of the present utility model, some components in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size, and it may be understood by those skilled in the art that some well-known structures in the drawings and descriptions thereof may be omitted.

In the description of the present utility model, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., which are based on the azimuth or positional relationship shown in the drawings, it is merely for convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and are not to be construed as limiting the present utility model, and that the specific meanings of the terms described above may be understood by those of ordinary skill in the art in view of the specific circumstances, and that the terms such as "first", "second", etc. are merely used for distinguishing the description in the description of the present utility model and are not to be construed as indicating or implying relative importance.

As shown in fig. 1-9, an embodiment of the utility model provides an automatic garbage cleaning device, which comprises a mobile trolley and a cleaner main body arranged at the top of the mobile trolley, wherein the top of the cleaner main body is communicated with a suction pipe 15 with the other end positioned at the front end of the mobile trolley, the front end of the mobile trolley is provided with a swing rod 10 and a power component for driving the swing rod 10 to swing along the left-right direction of the mobile trolley, and one end (namely the front end of the suction pipe 15) of the suction pipe 15 far away from the cleaner main body is connected with the swing rod 10. The front end of the mobile trolley is positioned in front of the suction pipe 15 and is also provided with a cleaning mechanism, the cleaning mechanism comprises a support component arranged on the mobile trolley and a rotating roller 24 rotatably arranged on the support component, the surface of the rotating roller 24 is fixedly connected with a plurality of brushes 25, and a transmission mechanism for driving the rotating roller 24 to rotate is also arranged between the rotating roller 24 and the mobile trolley.

In the embodiment, the suction pipe 15 adopts a hose which has certain flexibility and ductility, has good distortion performance in actual use, can not be damaged due to swing, has long service life, is fixedly connected with the dust collection head 18 at the bottom of the front end of the suction pipe 15, is used for sucking fallen leaves or other garbage on the ground, and the rotating roller 24 rotates to drive the hairbrush 25 to rotate so as to clean the stubborn garbage on the ground, and is sucked by the suction pipe 15, so that the cleaning effect is good.

The travelling car includes frame 1, and front rotating shaft 3, back pivot 2 are installed in the rotation respectively to the front and back both ends of frame 1 bottom, and the both ends of back pivot 2 are fixedly connected with back walking wheel 4 respectively, and the both ends of front rotating shaft 3 are fixedly connected with front walking wheel 5 respectively, and in this embodiment, frame 1 bottom four corners punishment do not are fixed with backup pad 14, and front rotating shaft 3, back pivot 2 are worn to establish in backup pad 14 bottom through the bearing rotation respectively. The swing rod 10 is horizontally arranged, one end of the swing rod 10 is rotatably connected with the middle position of the bottom of the frame 1 the other end extends out of the frame 1 the front end forms a suspension end.

The front end surface of the suction pipe 15 is sleeved with a sleeve ring 16, a pull rope 17 is arranged between the sleeve ring 16 and the swing rod 10, and two ends of the pull rope 17 are fixedly connected with the top of the sleeve ring 16 and the bottom of the swing rod 10 respectively.

In this embodiment, the rear end of the suction pipe 15 is communicated with the top of the main body of the cleaning machine, the front end of the suction pipe 15 extends horizontally to the front end of the frame 1 after penetrating through the middle of the frame 1, the front end of the suction pipe 15 is located between the swing rod 10 and the front rotating shaft 3, two collars 16 are sleeved on the surface of the suction pipe 15, the two collars 16 are respectively located at two ends of the horizontal section of the front end of the suction pipe 15, and the collars 16 can be fixedly sleeved on the suction pipe 15 or movably sleeved on the suction pipe 15. In the structural design, the pull rope 17 and the lantern ring 16 support the front end of the suction pipe 15, and the swing rod 10 can drive the front end of the suction pipe 15 to swing.

The front rotating shaft 3 is coaxially fixed with a drive bevel gear 6, the power assembly comprises a rotating rod 8 and a transmission rod 9, the rotating rod 8 is rotatably arranged on one side of the bottom of the frame 1 along the vertical direction, a driven bevel gear 7 meshed with the drive bevel gear 6 for transmission is fixed at the bottom end of the rotating rod 8, a protruding portion 44 formed by sinking along the horizontal direction is arranged in the middle of the rotating rod 8, one end of the transmission rod 9 is rotatably connected with the protruding portion 44 of the rotating rod 8, and the other end of the transmission rod 9 is rotatably connected with the middle position of the bottom of the swing rod 10.

In this embodiment, the transmission rod 9 is horizontally arranged, a fixing plate 13 is fixed between two support plates 14 at the front end of the frame 1 along the horizontal direction, the fixing plate 13 is positioned between the front end of the suction pipe 15 and the swing rod 10, and a vertical section at the bottom of the rotating rod 8 is rotatably connected to the mounting plate 40 through a bearing to form a stable support for the rotating rod 8. When the travelling trolley advances, the front rotating shaft 3 drives the driving bevel gear 6 to rotate, the driving bevel gear 6 drives the driven bevel gear 7 and the rotating rod 8 to rotate, one end of the transmission rod 9, which is close to the rotating rod 8, moves circularly in the horizontal direction, one end of the transmission rod 9, which is close to the swinging rod 10, moves in a curve manner, and drives the cleaning swinging rod 10 to swing in a left-right reciprocating manner.

A guide plate 11 is fixed at the front end of the bottom of the frame 1, a guide groove 12 for a swing rod 10 to pass through is formed in the guide plate 11 along the width direction of the frame 1, and the swing rod 10 is in sliding fit with the guide groove 12.

In this embodiment, the guide groove 12 can support the swing rod 10, so as to ensure that the swing rod 10 cannot deviate during swing, so that the swing rod 10 is not damaged easily, and the service life of the swing rod 10 is prolonged.

The support assembly comprises a support rod 19 fixed at the front end of the top of the frame 1 and a mounting shell 22 arranged at the front end of the support rod 19, a rotating shaft 23 is coaxially fixed on a rotating roller 24, the rotating roller 24 is rotatably arranged in the mounting shell 22 through the rotating shaft 23, and in the embodiment, the axis of the rotating roller 24 is parallel to the width direction of the movable trolley. The transmission mechanism comprises a first belt wheel 26 and a second belt wheel 28, the first belt wheel 26 is fixed on the front rotating shaft 3, one end of the rotating shaft 23 penetrates out of the mounting shell 22 and is fixedly connected with the second belt wheel 28, a first belt 27 is sleeved between the first belt wheel 26 and the second belt wheel 28, and when the travelling car moves, the front rotating shaft 3 rotates, the rotating shaft 23 is driven to rotate through the first belt wheel 26, the first belt 27 and the second belt wheel 28, so that the rotating roller 24 is driven to rotate, and the hairbrush 25 on the surface of the rotating roller 24 cleans and scrapes ground stubborn garbage, so that the garbage is convenient to be sucked by the suction pipe 15.

A telescopic rod 20 is arranged between the support rod 19 and the installation shell 22, a spring 21 is sleeved outside the telescopic rod 20, the top end of the spring 21 is fixedly connected to the bottom of the support rod 19, and the bottom end of the spring is fixedly connected to the top of the installation shell 22.

In this embodiment, the telescopic rod 20 may be a fishing rod type telescopic rod 20, at this time, the top end of the telescopic rod 20 is fixedly connected with the bottom of the supporting rod 19, the bottom end of the telescopic rod is fixedly connected with the top of the installation shell 22, and the telescopic rod 20 may also be slidably inserted through the bottom of the supporting rod 19, and the bottom of the telescopic rod 20 is fixedly connected with the installation shell 22. By means of the structural design, the spring 21 can pre-press the mounting shell 22, so that the hairbrush 25 positioned at the bottom of the rotating roller 24 always keeps contact with the ground, and meanwhile, when the hairbrush meets a hollow uneven road section, the rotating roller 24 and the mounting shell 22 have a certain rebound quantity, so that the cleaning mechanism cannot interfere with the moving trolley, and normal movement of the moving trolley is guaranteed.

The cleaning machine main body comprises a collecting box 29 fixedly arranged at the rear end of the top of the frame 1, a mounting plate 40 is fixed on one side of the top of the collecting box 29 through bolts, an exhaust fan 41 is fixed on the mounting plate 40 through bolts, a crushing mechanism is arranged at the top position in the collecting box 29 and comprises a driving roller 36 and a driven roller 37 which are arranged side by side along the horizontal direction, the driving roller 36 and the driven roller 37 are respectively and coaxially fixed with a driving shaft 34 and a driven shaft 35, the driving shaft 34 is in rotary connection with the collecting box 29 and the driven shaft 35 is in transmission connection with the output end of a motor 30 and the driven shaft 35.

In this embodiment, the motor 30 is fixedly mounted at a middle position of the top of the frame 1 through bolts, one end of the driving shaft 34 passes through the collecting box 29 and is fixed with the driven pulley 33, the output end of the motor 30 is fixed with the driving pulley 31, the second belt 32 is sleeved between the driving pulley 31 and the driven pulley 33, the driving gear 38 is fixed at the other end of the driving shaft 34, and the driven shaft 35 is fixed with the driven gear 39 meshed with the driving gear 38. A plurality of crushing discs 42 are uniformly arranged on the driving roller 36 at intervals along the axial direction of the driving roller, a plurality of grooves are formed in the circumferential direction of each crushing disc 42, a plurality of crushing teeth are formed in the circumferential direction of each crushing disc 42, and a plurality of crushing discs 42 are correspondingly arranged on the driven roller 37. With such a structural design, the motor 30 rotates, the driving pulley 31, the second belt 32 and the driven pulley 33 drive the driving shaft 34 to rotate, the driving shaft 34 drives the driving roller 36, the driven shaft 35 and the driven roller 37 to rotate, the driving roller 36 and the driven roller 37 form double-roller crushing, the crushing teeth crush fallen leaves or other garbage which is sucked, the crushing effect is good, the crushing efficiency is high, and the garbage is not easy to block.

A pushing hand 43 is fixedly arranged at the rear end of the mobile trolley, so that students can push the mobile trolley conveniently.

Working principle:

When the garbage collection device is used, students push the mobile trolley to move through the pushing hands 43, when the mobile trolley moves, the front rotating shaft 3 rotates to drive the rotating rods to rotate through the transmission mechanism, so that ground stubborn garbage is removed, the front rotating shaft 3 simultaneously drives the swing rod 10 and the front end of the suction pipe 15 through the power assembly to swing, ground fallen leaves or other garbage are sucked, and the garbage such as the fallen leaves is crushed through the crushing mechanism, so that smaller crushed aggregates enter the lower part of the collection box 29 to be stored. The automatic garbage cleaning device provided by the utility model has the advantages of ingenious structure, simple use, convenient operation, good garbage cleaning effect of fallen leaves and the like and high cleaning efficiency, thereby greatly reducing the cleaning work of students on fallen leaves on the ground of a campus in autumn and winter.

The above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model. The technology, shape, and construction parts of the present utility model, which are not described in detail, are known in the art.

Claims (10)

1. The automatic garbage cleaning device is characterized by comprising a mobile trolley and a cleaning machine main body arranged at the top of the mobile trolley, wherein the cleaning machine main body is communicated with a suction pipe (15) with the other end positioned at the front end of the mobile trolley, the front end of the mobile trolley is provided with a swinging rod (10) and a power component for driving the swinging rod (10) to swing along the left side and the right side of the mobile trolley, one end of the suction pipe (15) far away from the cleaning machine main body is connected with the swinging rod (10), the front end of the mobile trolley is positioned in front of the suction pipe (15), a cleaning mechanism is further arranged, the cleaning mechanism comprises a support component arranged on the mobile trolley and a rotating roller (24) rotatably arranged on the support component, a plurality of brushes (25) are fixedly connected to the surface of the rotating roller (24), and a transmission mechanism for driving the rotating roller (24) to rotate is further arranged between the rotating roller (24) and the mobile trolley.

2. The automatic garbage cleaning device according to claim 1, wherein the mobile trolley comprises a frame (1), a front rotating shaft (3) and a rear rotating shaft (2) are respectively rotatably arranged at the front end and the rear end of the bottom of the frame (1), rear traveling wheels (4) are respectively fixedly connected to the two ends of the rear rotating shaft (2), front traveling wheels (5) are respectively fixedly connected to the two ends of the front rotating shaft (3), one end of a swinging rod (10) is rotatably connected to the middle of the bottom of the frame (1), and the other end of the swinging rod extends out of the front end of the frame (1) to form a suspension end.

3. The automatic garbage cleaning device according to claim 2, wherein a collar (16) is arranged on the surface of one end, far away from the main body of the cleaner, of the suction pipe (15), a pull rope (17) is arranged between the collar (16) and the swing rod (10), and two ends of the pull rope (17) are fixedly connected with the top of the collar (16) and the bottom of the swing rod (10) respectively.

4. The automatic garbage cleaning device according to claim 2, wherein the front rotating shaft (3) is fixedly provided with a driving bevel gear (6), the power assembly comprises a rotating rod (8) and a transmission rod (9), the rotating rod (8) is rotatably arranged on one side of the bottom of the frame (1) along the vertical direction, a driven bevel gear (7) meshed with the driving bevel gear (6) for transmission is fixed at the bottom end of the rotating rod (8), a protruding portion (44) formed by sinking along the horizontal direction is arranged in the middle of the rotating rod (8), one end of the transmission rod (9) is rotatably connected with the protruding portion (44) of the rotating rod (8), and the other end of the transmission rod is rotatably connected with the middle of the swing rod (10).

5. The automatic garbage cleaning device according to claim 4, wherein a guide plate (11) is arranged at the front end of the bottom of the frame (1), a guide groove (12) for a swing rod (10) to pass through is formed in the guide plate (11) along the width direction of the frame (1), and the swing rod (10) is in sliding fit with the guide groove (12).

6. An automatic garbage cleaning device according to claim 2, characterized in that the supporting component comprises a supporting rod (19) fixed at the front end of the frame (1) and a mounting shell (22) mounted at the front end of the supporting rod (19), the rotating roller (24) is coaxially fixed with a rotating shaft (23), and the rotating roller (24) is rotatably mounted in the mounting shell (22) through the rotating shaft (23).

7. The automatic garbage cleaning device according to claim 6, wherein the transmission mechanism comprises a first belt wheel (26) and a second belt wheel (28), the first belt wheel (26) is fixed on the front rotating shaft (3), one end of the rotating shaft (23) penetrates out of the mounting shell (22) and is fixedly connected with the second belt wheel (28), and a first belt (27) is sleeved between the first belt wheel (26) and the second belt wheel (28).

8. The automatic garbage cleaning device according to claim 6, wherein a telescopic rod (20) is arranged between the supporting rod (19) and the installation shell (22), a spring (21) is sleeved outside the telescopic rod (20), one end of the spring (21) is fixedly connected to the bottom of the supporting rod (19), and the other end of the spring is fixedly connected to the top of the installation shell (22).

9. The automatic garbage cleaning device according to claim 2, wherein the main body of the cleaning machine comprises a collecting box (29) arranged at the rear end of the top of the frame (1), an exhaust fan (41) is arranged on one side of the top of the collecting box (29), a crushing mechanism is arranged in the collecting box (29), the crushing mechanism comprises a driving roller (36) and a driven roller (37) which are arranged side by side along the horizontal direction, the driving roller (36) and the driven roller (37) are respectively and coaxially fixed with a driving shaft (34) and a driven shaft (35), the driving shaft (34) is rotationally connected with the collecting box (29) and the driven shaft (35) is in transmission connection with the output end of the motor (30) and the driven shaft (35) respectively.

10. The automatic garbage cleaning device according to claim 1, wherein a pushing handle (43) is arranged at the rear end of the movable trolley.