CN114348079A

CN114348079A - Multi-functional building site uses small handcart

Info

Publication number: CN114348079A
Application number: CN202111620136.9A
Authority: CN
Inventors: 高文英
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-04-15

Abstract

The invention relates to a trolley, in particular to a multifunctional trolley for a construction site. The technical problem to be solved is as follows: the utility model provides a can easily unload and have the multi-functional building site of filtering sand effect and use small handcart. The technical scheme is as follows: the utility model provides a multi-functional building site uses small handcart, is including automobile body, barrier plate, first pivot, dead lever, second pivot, supporting shoe, topples over mechanism and pushing hands mechanism, is connected with first pivot at the inside right side rotary type of automobile body, is provided with the barrier plate through the torsional spring in first pivot, is connected with first pivot at the outside left side rotary type of automobile body, and the second pivot is installed to symmetry rotary type around in the middle of the inside downside of automobile body. Drive first slide bar downstream through transfer line anticlockwise rotation for empty the board clockwise rotation and empty the sand on suitable position, so, people can easily pour the sand, effectively improve the work efficiency of uninstalling the sand under the effect of pulling the flexbile plate.

Description

Multi-functional building site uses small handcart

Technical Field

The invention relates to a trolley, in particular to a multifunctional trolley for a construction site.

Background

The small trolley can be generally seen on a construction site, can be used for transporting sand, bricks or other construction materials and the like, is very simple to operate and is convenient for construction workers to work.

With the continuous development of the building industry, the technology of carrying materials is continuously developed, and the small handcart used in the construction site is one of indispensable tools in the construction site at present, the traditional small handcart used in the construction site generally comprises a small handcart body and a cover, a material outlet is formed in the front of the small handcart body, when in charging, the cover needs to be opened, then the material outlet of the small handcart body is inclined towards the ground, then the materials are loaded into the small handcart body, after the loading, the small handcart body is rotated and reset, the cover is closed, then the materials are driven to move by moving the small handcart body, so that the effect of transporting the materials can be achieved, however, in the discharging process, two persons are required to incline the small handcart body again together, so that the materials are automatically poured out, and the materials need to be taken out by using tools, and people cannot easily discharge the materials, in the process of pushing materials, the cover has poor blocking effect on the materials, the materials are easy to shake and scatter on the ground due to the fact that the ground of a construction site is not very flat, the working efficiency is influenced, the sand is not filtered, the sand is transported to a proper position and then is filtered, and the labor intensity of people is increased easily.

To sum up, need design one kind and can easily unload the material and have the multi-functional building site that filters the sand effect and use the small handcart to solve foretell problem.

Disclosure of Invention

In order to overcome traditional building site and use small handcart, can not easily unload, and do not have the effect of filterable sand, increase people intensity of labour's shortcoming easily, the technical problem that solves is: the utility model provides a can easily unload and have the multi-functional building site of filtering sand effect and use small handcart.

The technical scheme is as follows: the utility model provides a multi-functional building site uses small handcart, which comprises a carriage body, the barrier plate, first pivot, the dead lever, the second pivot, the supporting shoe, empty mechanism and pushing hands mechanism, right side rotary type is connected with first pivot in the automobile body inside, be provided with the barrier plate through the torsional spring in first pivot, the second pivot is installed to symmetry rotary type around in the middle of the inside downside of automobile body, all be provided with the dead lever with the barrier plate contact in the second pivot, the equal rigid coupling in both sides has the supporting shoe around in the middle of the automobile body bottom, install in the inside left side of automobile body and empty the mechanism, be provided with pushing hands mechanism in the outside left side of automobile body.

Optionally, the dumping mechanism comprises a first sliding rod, a flexible plate, a dumping plate, a third rotating shaft and a guide rod, the first sliding rod which can be contacted with the fixed rod is connected to the left side inside the vehicle body in a sliding mode, the flexible plate is connected to the right side of the first sliding rod, the third rotating shaft is arranged on the lower right side inside the vehicle body in a rotating mode, the dumping plate connected with the flexible plate is connected to the third rotating shaft through an elastic piece, and the guide rod contacted with the flexible plate is fixedly connected to the upper left side inside the vehicle body.

Optionally, the pushing mechanism includes a pushing rod, a transmission rod and a fourth rotating shaft, the fourth rotating shaft is rotatably mounted on the front side and the rear side of the vehicle body, the transmission rod slidably connected with the first sliding rod is arranged on the outer side of the fourth rotating shaft, and the pushing rod is connected between the inner sides of the transmission rods.

Optionally, still including screening sand mechanism, screening sand mechanism is including the second slide bar, first fixed frame, the fifth pivot, screening sand net, the fixed frame of second and dog, it is provided with the second slide bar to slide in the inside left side of automobile body, be connected with first fixed frame at the inboard rotary type of second slide bar, be connected with the fifth pivot at first fixed frame upside rotary type, there is the fixed frame of second through torsional spring connection in the fifth pivot, screening sand net is all installed to fixed frame inboard at first fixed frame and second, there is the dog with the fixed frame contact complex of second in the rigid coupling in upper portion left side of barrier plate.

Optionally, still including vibrations mechanism, vibrations mechanism is including the base, remove the wheel, the cam, the guide rail, first spring and buffer block, sliding type connection has the base at automobile body downside, the symmetry rigid coupling has the guide rail around the inside left and right sides of base is equal, sliding type connection has the buffer block with car body connection in the guide rail inboard, the equal rotary type in the inside left and right sides of base is provided with the cam that rotates all with car body contact complex, both sides all install the removal wheel around the cam, all be connected with first spring between buffer block bottom and the guide rail inboard.

Optionally, the device further comprises a fixing mechanism, and the fixing mechanism is installed on the inner side of the base.

Optionally, fixed establishment is including the fixed block, the pull ring, the bull stick, fixture block and second spring, the fixed block of placing with adjacent supporting shoe contact is all slided type in both sides around base inside, the pull ring is installed to all slided type in the fixed block inboard, the equal bilateral symmetry rotary type in pull ring inboard is connected with the bull stick, the equal bilateral symmetry slidable type in both sides is connected with the fixture block of being connected with adjacent bull stick rotary type around base inside, equal longitudinal symmetry is connected with the second spring between fixture block inboard and base inboard.

Optionally, the push rod is sleeved with a rubber pad, and the rubber pad can prevent the palm of people from being worn.

The beneficial effects are that: 1. drive first slide bar downstream through transfer line anticlockwise rotation for empty the board clockwise rotation and empty the sand on suitable position, so, people can easily pour the sand, effectively improve the work efficiency of uninstalling the sand under the effect of pulling the flexbile plate.

2. Rotate 90 degrees backs clockwise at the fixed frame of second and contact with the dog, support the fixed frame of second in the effect of dog, be in comparatively horizontality between the screening sand net this moment, can filter the sand under the effect of screening sand net for tiny sand can come and fall in the automobile body, reach the effect of filtering the sand.

3. Rotate alright promote this shallow through removing the wheel, remove the wheel and rotate and drive the cam and rotate, every and the automobile body contact of protruding department of cam is once, then can promote the automobile body and upwards remove, so relapse, reached can shake and mix the effect of building site material, effectively improve operation personnel's work efficiency.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic perspective view of a portion of the present invention.

Fig. 3 is a schematic perspective view of the present invention at a.

Fig. 4 is a schematic sectional perspective view of a part of the present invention.

Fig. 5 is a schematic perspective view of the present invention at B.

Fig. 6 is a partial perspective view of the pouring mechanism of the present invention.

Fig. 7 is a schematic perspective view of the dumping mechanism C according to the present invention.

Fig. 8 is a schematic perspective view of the dumping mechanism D according to the present invention.

Fig. 9 is a schematic perspective view of the pushing mechanism of the present invention.

Fig. 10 is a schematic view of a first partial body structure of a sand screening mechanism of the present invention.

Fig. 11 is a schematic view of a second partial body structure of the sand screening mechanism of the present invention.

Fig. 12 is a perspective view of a third part of a sand screening mechanism according to the present invention.

Fig. 13 is a schematic view of a first partial body structure of the vibration mechanism of the present invention.

Fig. 14 is a schematic view of a second partial body structure of the vibration mechanism of the present invention.

Fig. 15 is a schematic view of a first partial body structure of the fastening mechanism of the present invention.

Fig. 16 is a cross-sectional view of the securing mechanism of the present invention.

FIG. 17 is a schematic view of a second partial body structure of the fastening mechanism of the present invention.

Reference numerals: 1. the device comprises a vehicle body, 11, a blocking plate, 12, a first rotating shaft, 13, a fixing rod, 14, a second rotating shaft, 15, a supporting block, 2, a dumping mechanism, 21, a first sliding rod, 22, a flexible plate, 23, a dumping plate, 24, a third rotating shaft, 25, a guide rod, 3, a pushing mechanism, 31, a push rod, 32, a transmission rod, 33, a fourth rotating shaft, 4, a sand screening mechanism, 41, a second sliding rod, 42, a first fixing frame, 43, a fifth rotating shaft, 44, a sand screening net, 45, a second fixing frame, 46, a stop block, 5, a vibration mechanism, 51, a base, 52, a moving wheel, 53, a cam, 54, a guide rail, 55, a first spring, 56, a buffer block, 6, a fixing mechanism, 61, a fixing block, 62, a pull ring, 63, a rotating rod, 64, a clamping block, 65 and a second spring.

Detailed Description

The invention is further illustrated by the following specific examples in which, unless otherwise explicitly stated and limited, terms such as: the arrangement, installation, connection are to be understood broadly, for example, they may be fixed, detachable, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

A multifunctional small handcart for construction sites is disclosed, as shown in figures 1, 2, 3, 4, 5, 6, 7, 8 and 9, comprising a handcart body 1, a barrier plate 11, a first rotating shaft 12, a fixed rod 13, a second rotating shaft 14, a supporting block 15, a dumping mechanism 2 and a pushing mechanism 3, wherein the right side inside the handcart body 1 is rotatably connected with the first rotating shaft 12, the first rotating shaft 12 is provided with the barrier plate 11 which is matched with the handcart body 1 in a blocking way through a torsional spring, the number of the torsional springs is two, the torsional springs are connected between the outer side of the barrier plate 11 and the upper side inside the handcart body 1, the second rotating shaft 14 is rotatably arranged in the middle of the lower side inside the handcart body 1 in a front-back symmetrical way, the fixed rods 13 are arranged on the second rotating shaft 14 through the torsional springs, the number of the torsional springs is two, the torsional springs are connected between the fixed rod 13 and the inner side of the handcart body 1, the fixed rod 13 is clamped with the barrier plate 11, the wedge-shaped supporting blocks 15 are fixedly connected at the front side and the rear side of the middle of the bottom of the handcart body 1, the dumping mechanism 2 is installed on the left side inside the vehicle body 1, and the pushing handle mechanism 3 is arranged on the left side outside the vehicle body 1.

Dumping mechanism 2 is including first slide bar 21, the flexible board 22, dumping board 23, third pivot 24 and

guide bar

25, 1 inside left side sliding connection of automobile body has first slide bar 21, first slide bar 21 removes and can contact with dead lever 13, first slide bar 21 right side is connected with flexible board 22, flexible board 22 has the pliability, 1 inside right side downside rotary type of automobile body is provided with third pivot 24, be connected with dumping board 23 on the third pivot 24 between through the elastic component, elastic component quantity is two, the elastic component is all connected between dumping board 23 and the automobile body 1 inboard, dumping board 23 left side is connected with

flexible board

22, 1 inside upper left side rigid coupling of automobile body has guide bar 25, guide bar 25 and flexible board 22 contact.

The pushing mechanism 3 comprises a pushing rod 31, a transmission rod 32 and a fourth rotating shaft 33, the fourth rotating shaft 33 is rotatably mounted on the front side and the rear side of the vehicle body 1, the transmission rod 32 is arranged on the outer side of the fourth rotating shaft 33, the transmission rod 32 is slidably connected with the first sliding rod 21, and the pushing rod 31 is connected between the inner sides of the transmission rods 32.

In the initial state, the fixing rod 13 blocks the blocking plate 11, the torsion spring is in a deformation state, when people need to transport sand, people pour the sand into the cart body 1, the sand can be blocked under the action of the blocking plate 11, the cart is transported to a proper position through the push rod 31, and the push rod 31 is sleeved with a rubber pad, so that the palm is not easily abraded when people push the cart, then the push rod 31 is manually rotated anticlockwise to drive the transmission rod 32 and the fourth rotating shaft 33 to rotate anticlockwise, the transmission rod 32 rotates anticlockwise to push the first sliding rod 21 to move downwards, the first sliding rod 21 moves downwards to pull the flexible plate 22, the flexible plate 22 has certain flexibility, the flexible plate 22 is bent into an arc state under the action of the guide rod 25, the inclined plate 23 is driven by the flexible plate 22 to rotate clockwise, and the third rotating shaft 24 is driven to rotate clockwise, the elastic element deforms, meanwhile, the first sliding rod 21 moves downwards and contacts with the fixed rod 13, so that the fixed rod 13 is pushed to rotate anticlockwise, the second rotating shaft 14 is driven to rotate anticlockwise, the torsion spring on the fixed rod 13 deforms, the fixed rod 13 rotates anticlockwise to separate from the blocking plate 11, at this time, the blocking plate 11 and the first rotating shaft 12 are driven to rotate anticlockwise under the reset action of the torsion spring, the blocking plate 11 cannot block the car body 1, sand is dumped under the clockwise rotation action of the dumping plate 23, the sand slides along the dumping plate 23 to a proper position, the sand dumping effect can be easily achieved, after the sand is dumped, the push rod 31 is loosened by people, the dumping plate 23 is driven to rotate anticlockwise under the reset action of the elastic element, the flexible plate 22 is driven to return to the initial state, and the flexible plate 22 drives the first sliding rod 21 to move upwards after being reset, drive push rod 31, transfer line 32 and fourth pivot 33 clockwise rotation through first slide bar 21 and reset, people are manual afterwards to close baffle 11 clockwise rotation, drive first pivot 12 clockwise rotation, and the torsional spring takes place to be out of shape, and after baffle 11 resets, under the effect that the torsional spring resets on dead lever 13, drive dead lever 13 and second pivot 14 clockwise rotation reset for dead lever 13 blocks baffle 11 can.

Example 2

On the basis of the embodiment 1, as shown in figure 1, figure 10, figure 11, figure 12, figure 13 and figure 14, fig. 15, fig. 16 and fig. 17 show, further include the sand sieving mechanism 4, the sand sieving mechanism 4 includes a second sliding rod 41, a first fixed frame 42, a fifth rotating shaft 43, a sand sieving net 44, a second fixed frame 45 and a stop block 46, the second sliding rod 41 is slidably disposed on the left side inside the vehicle body 1, the first fixed frame 42 is rotatably connected to the inner side of the second sliding rod 41, the fifth rotating shaft 43 is rotatably connected to the upper side of the first fixed frame 42, the second fixed frame 45 is connected to the fifth rotating shaft 43 through a torsion spring, the number of the torsion springs is two, the torsion springs are all connected between the outer side of the second fixed frame 45 and the inner right side of the first fixed frame 42, the sand sieving net 44 is installed on the inner sides of the first fixed frame 42 and the second fixed frame 45, and the stop block 46 abutting against and matching with the second fixed frame 45 is fixedly connected to the left side of the upper portion of the stop plate 11.

In an initial state, the second fixed frame 45 is fixed by the vehicle body 1, the torsion spring is in a deformation state, when sand needs to be poured into the vehicle body 1, people manually move the second sliding rod 41 upwards to drive the first fixed frame 42, the fifth rotating shaft 43, the sand screening net 44 and the second fixed frame 45 to move upwards, when the second fixed frame 45 moves upwards to be not blocked by the vehicle body 1, the torsion spring is reset to drive the second fixed frame 45 to rotate 180 degrees anticlockwise and drive the fifth rotating shaft 43 and the sand screening net 44 on the right side to rotate 180 degrees anticlockwise, then people manually rotate the first fixed frame 42 90 degrees clockwise to drive the fifth rotating shaft 43, the sand screening net 44 and the second fixed frame 45 to rotate 90 degrees clockwise, so that the second fixed frame 45 rotates to be contacted with the stop block 46, the stop block 46 plays a supporting role for the second fixed frame 45, at this time, people can start to pour the sand into the vehicle body 1, make the sand through screening sand net 44, filter the sand under the effect of screening sand net 44, tiny sand can drop in automobile body 1 through screening sand net 44, the effect of screening sand has been reached, after sand screening finishes, people are manual with first fixed frame 42 anticlockwise rotation 90 degrees, drive fifth pivot 43, screening sand net 44 and the fixed frame 45 anticlockwise rotation 90 degrees of second, then rotate 180 degrees second fixed frame 45 clockwise, drive fifth pivot 43 and the screening sand net 44 on right side and rotate 180 degrees and reset, the torsional spring is twisted, finally, people move second slide bar 41 downwards, drive first fixed frame 42, fifth pivot 43, screening sand net 44 and the fixed frame 45 of second move downwards, make the fixed frame 45 of second fixed by automobile body 1 fixed can.

Still including vibrations mechanism 5, vibrations mechanism 5 is including base 51, remove wheel 52, cam 53, guide rail 54, first spring 55 and

buffer block

56, 1 downside sliding type of automobile body is connected with base 51, the equal front and back symmetry rigid coupling in the inside left and right sides of base 51 has guide rail 54, the equal sliding type of guide rail 54 inboard is connected with cylindrical shape's buffer block 56, the buffer block 56 top all is connected with automobile body 1, the equal rotary type in the inside left and right sides of base 51 is provided with cam 53, cam 53 rotates all and cooperates with automobile body 1 contact, remove wheel 52 is all installed to both sides around cam 53, all be connected with first spring 55 between buffer block 56 bottom and the guide rail 54 inboard.

Still including fixed establishment 6, fixed establishment 6 is including fixed block 61, pull ring 62, bull stick 63, fixture block 64 and second spring 65, wedge-shaped fixed block 61 has all been placed to both sides all slidingtype around base 51 is inside, fixed block 61 all supports with adjacent supporting shoe 15 and keeps out the contact, pull ring 62 is all slidingtype installed to fixed block 61 inboard, the equal bilateral symmetry rotary type in pull ring 62 inboard is connected with bull stick 63, the equal bilateral symmetry sliding connection in both sides has special-shaped fixture block 64 around base 51 is inside, fixture block 64 inboard all is connected with adjacent bull stick 63 rotary type, equal longitudinal symmetry is connected with second spring 65 between fixture block 64 inboard and the base 51 inboard.

In an initial state, the fixed block 61 abuts against the supporting block 15, the first spring 55 is in a stretched state, when a material on a construction site is loaded in the vehicle body 1, the pull ring 62 is manually moved outwards by people, so that the rotating rod 63 is driven to rotate inwards, the clamping block 64 is further driven to move inwards, the second spring 65 is compressed, the clamping block 64 cannot clamp the base 51, then the fixed block 61 is moved outwards and taken out by people, the pull ring 62, the rotating rod 63 and the clamping block 64 are driven to move outwards, so that the fixed block 61 is far away from the supporting block 15, the buffer block 56 and the vehicle body 1 are driven to move downwards under the action of the reset of the first spring 55, then the pull ring 62 is released, the clamping block 64 is driven to move outwards to reset under the reset action of the second spring 65, so that the rotating rod 63 is driven to rotate outwards to reset, the pull ring 62 is driven to move inwards to reset, at this time, the vehicle body 1 can be pushed by the rotation of the moving wheel 52, the moving wheel 52 rotates to drive the cam 53 to rotate, when the bulge of the cam 53 rotates to be in contact with the vehicle body 1, the vehicle body 1 and the buffer block 56 are pushed to move upwards, the second spring 65 is stretched, when the bulge of the cam 53 rotates to be not in contact with the vehicle body 1, the vehicle body 1 and the buffer block 56 are driven to move downwards and reset under the reset action of the second spring 65, the repeated actions are carried out, the intermittent vibration action is achieved, the construction site materials in the vehicle body 1 can be vibrated and mixed, when the construction site materials in the vehicle body 1 do not need to be vibrated and mixed, people manually move the fixing block 61 inwards to the original position, drive the pull ring 62, the rotating rod 63 and the fixture block 64 to move inwards and reset, the fixture block 64 can smoothly pass through the base 51 under the action of the second spring 65, the fixture block 64 can be clamped on the base 51, the fixing block 61 is in contact with the supporting block 15 after moving inwards, and accordingly the supporting block 15, the vehicle body 1 and the buffer block 56 are pushed to move upwards, second spring 65 is stretched for automobile body 1 rebound is kept away from cam 53, and like this, people just can not continue vibrations when promoting this shallow, effectively improves the work efficiency of transporting sand.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A multifunctional trolley for construction sites is characterized by comprising a trolley body (1), a blocking plate (11), a first rotating shaft (12), a fixed rod (13), a second rotating shaft (14), a supporting block (15), a dumping mechanism (2) and a pushing handle mechanism (3), a first rotating shaft (12) is rotatably connected at the right side in the vehicle body (1), a baffle plate (11) is arranged on the first rotating shaft (12) through a torsional spring, a second rotating shaft (14) is arranged in the lower middle of the interior of the vehicle body (1) in a front-back symmetrical and rotating manner, the second rotating shafts (14) are respectively provided with a fixed rod (13) contacted with the blocking plate (11), supporting blocks (15) are fixedly connected with the front side and the rear side of the middle of the bottom of the vehicle body (1), the left side of the interior of the vehicle body (1) is provided with a dumping mechanism (2), and the left side of the exterior of the vehicle body (1) is provided with a pushing handle mechanism (3).

2. The trolley for the multifunctional construction site as claimed in claim 1, wherein the dumping mechanism (2) comprises a first sliding rod (21), a flexible plate (22), a dumping plate (23), a third rotating shaft (24) and a guiding rod (25), the first sliding rod (21) which can move to contact with the fixed rod (13) is slidably connected to the left side inside the trolley body (1), the flexible plate (22) is connected to the right side of the first sliding rod (21), the third rotating shaft (24) is rotatably arranged on the lower right side inside the trolley body (1), the dumping plate (23) connected with the flexible plate (22) is connected to the third rotating shaft (24) through an elastic member, and the guiding rod (25) which contacts with the flexible plate (22) is fixedly connected to the upper left side inside the trolley body (1).

3. The trolley for the multifunctional construction site as claimed in claim 2, wherein the pushing mechanism (3) comprises a pushing rod (31), a transmission rod (32) and a fourth rotating shaft (33), the fourth rotating shaft (33) is rotatably installed at the front and rear sides of the trolley body (1), the transmission rod (32) slidably connected with the first sliding rod (21) is arranged at the outer side of the fourth rotating shaft (33), and the pushing rod (31) is connected between the inner sides of the transmission rods (32).

4. The multifunctional trolley for construction sites as claimed in claim 3, further comprising a sand screening mechanism (4), wherein the sand screening mechanism (4) comprises a second sliding rod (41), a first fixing frame (42), a fifth rotating shaft (43), a sand screening net (44), a second fixing frame (45) and a stop block (46), a second sliding rod (41) is arranged at the left side in the vehicle body (1) in a sliding way, a first fixed frame (42) is rotatably connected at the inner side of the second sliding rod (41), a fifth rotating shaft (43) is rotatably connected on the upper side of the first fixed frame (42), the fifth rotating shaft (43) is connected with a second fixed frame (45) through a torsional spring, the inner sides of the first fixed frame (42) and the second fixed frame (45) are both provided with a sand screening net (44), a stop block (46) which is in contact fit with the second fixed frame (45) is fixedly connected to the left side of the upper part of the stop plate (11).

5. The multi-functional trolley for construction sites of claim 4, further comprising a vibration mechanism (5), wherein the vibration mechanism (5) comprises a base (51), a moving wheel (52), a cam (53), a guide rail (54), a first spring (55) and a buffer block (56), a base (51) is connected with the lower side of the vehicle body (1) in a sliding way, guide rails (54) are symmetrically fixedly connected with the left side and the right side in the base (51) in the front-back direction, the inner sides of the guide rails (54) are all connected with a buffer block (56) connected with the vehicle body (1) in a sliding way, cams (53) which rotate and are in contact and matched with the vehicle body (1) are rotatably arranged on the left side and the right side in the base (51), the front side and the rear side of the cam (53) are respectively provided with a movable wheel (52), and a first spring (55) is connected between the bottom of the buffer block (56) and the inner side of the guide rail (54).

6. The multifunctional trolley for construction sites as claimed in claim 5, further comprising a fixing mechanism (6), wherein the fixing mechanism (6) is installed inside the base (51).

7. The trolley for the multifunctional construction site as claimed in claim 6, wherein the fixing mechanism (6) comprises a fixing block (61), a pull ring (62), a rotating rod (63), a clamping block (64) and a second spring (65), the fixing block (61) contacting with the adjacent supporting block (15) is slidably placed on the front side and the rear side inside the base (51), the pull ring (62) is slidably installed on the inner side of the fixing block (61), the rotating rod (63) is rotatably connected on the inner side of the pull ring (62) in a bilateral symmetry manner, the clamping block (64) rotatably connected with the adjacent rotating rod (63) is slidably connected on the front side and the rear side inside the base (51) in a bilateral symmetry manner, and the second spring (65) is symmetrically connected between the inner side of the clamping block (64) and the inner side of the base (51) in an up-down manner.

8. The multifunctional trolley for the construction site as claimed in claim 3, wherein the push rod (31) is sleeved with a rubber pad, and the rubber pad can prevent the palm of a user from being worn.