A construction site unloading platform

Abstract

The application relates to the technical field of building engineering facilities, in particular to a building site unloading platform. The unloading platform comprises a connecting mechanism and an unloading platform part connected with the ground through the connecting mechanism; the unloading platform part comprises a platform plate with one end connected with the ground and the other end extending outward, and a slanted groove is formed in the front end of the upper surface of the platform plate; a lifting point for connecting a steel rope is arranged on the side of the platform plate, and the steel rope is connected with an adjusting part arranged on a wall through a pulley. The unloading platform has the beneficial effects that: the slanted groove arranged on the platform plate is used for placing an unloading vehicle, so that the unloading vehicle cannot be knocked out or cannot move to the platform plate when unbalanced, thereby facilitating the placement of the unloading vehicle on the platform plate and the convenient back-and-forth transportation of materials; meanwhile, a balance detecting part and a blocking part are arranged for monitoring whether the unloading platform is in a balanced state in real time, and once unbalance occurs, the blocking part is controlled to limit the unloading vehicle from entering the unloading platform; and the adjusting part can also adjust the position of the unloading platform through the steel rope.

Description

Technical Field

[0001] This invention relates to the field of building engineering facilities technology, specifically to a construction site unloading platform. Background Technology

[0002] A material handling platform, also known as a transfer platform or receiving platform, is an essential component of construction sites, used to carry materials and perform other operations. It can be categorized into four types: mobile, ground-mounted, cantilevered, and telescopic. Currently, the cantilevered type is the most common, offering higher safety and wider application throughout China.

[0003] On construction sites, each floor needs an outward-extending unloading platform to facilitate the transport of materials. However, over time, the steel cables holding the platform lengthen, causing it to tilt downwards. This results in material carts tending to lurch forward during transport. Conversely, if the cables are too short, the platform tilts upwards, making it difficult to push the carts forward. Adjusting the cables is also challenging and poses safety hazards. Therefore, ensuring the platform remains balanced and taking appropriate measures to address any imbalances during unloading operations is crucial. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the unloading platform in the current construction site has construction safety risks due to improper balance; including problems such as the material truck running out of control or difficulty in pushing it onto the platform, and the steel cable connecting the platform cannot be used to adjust the balance of the unloading platform.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows: a construction site unloading platform, including a connecting mechanism and an unloading platform component connected to the ground through the connecting mechanism; the unloading platform component includes a platform plate with one end connected to the ground and the other end extending outward, the upper surface of the platform plate having a downward-facing inclined groove at its front end, and an unloading area being provided on the upper surface of the platform plate in front of the inclined groove; the side of the platform plate has a suspension point for connecting steel ropes, and the steel ropes are connected to an adjusting component set on the wall through pulleys; the connecting mechanism includes a base overlapping the front end of the wall, the base having a connecting area, and the connecting area being fixedly connected to the wall through a connecting component; the front end of the base is movably connected to the rear end of the platform plate through a hinge seat, and a balance detection component is provided between the bottom of the base and the bottom of the platform plate; a blocking component controlled by a drive motor is provided on the base, and the balance detection component is connected to and controlled by a drive motor through a signal transmission line.

[0006] The beneficial effects of this invention are as follows: The purpose of setting the inclined groove on the platform plate is to facilitate the placement of the unloading car, so as to avoid the unloading car rushing out or being unable to move onto the platform plate when it is unbalanced, thus making it convenient to place on the platform plate and transport materials back and forth; at the same time, balance detection components and blocking components are also set to monitor whether the unloading platform is in a balanced state in real time. Once an imbalance occurs, the blocking components will be immediately controlled to restrict the car from entering the unloading platform. The setting of the adjustment component can also realize the adjustment of the position of the unloading platform by the steel cable.

[0007] As a further improvement of the present invention, the technical problem to be solved is: how to specifically realize the real-time and reliable balance detection function of the balance detection component.

[0008] To solve the above-mentioned technical problems, the present invention further improves the technical solution as follows: the balance detection component includes a photoelectric switch receiving end disposed opposite to the bottom of the base and a photoelectric switch emitting end disposed at the bottom of the platform plate, and a horizontal channel parallel to the ground is provided between the photoelectric switch receiving end and the photoelectric switch emitting end for limiting the optical path angle; the photoelectric switch receiving end is connected to and controlled by a drive motor through a signal transmission line.

[0009] The beneficial effects of the above improvements are as follows: by utilizing the characteristics of photoelectric switches, a horizontal channel parallel to the ground is used to detect whether the light rays set between the photoelectric switches are parallel; specifically, the photoelectric switch transmitter at the bottom of the platform plate emits detection light. If the unloading platform is in a balanced state, the light emitted by the photoelectric switch transmitter can completely reach the photoelectric switch receiver through the horizontal channel; if the unloading platform is unbalanced, regardless of whether it is tilted upwards or downwards, the light at the photoelectric switch transmitter can only reach the front end of the horizontal channel along the bottom of the platform plate but cannot reach the rear end through the horizontal channel. The photoelectric switch receiver cannot receive the light, thereby triggering and controlling the blocking component to start.

[0010] As a further improvement of the present invention, the technical problem to be solved is: how the blocking component can specifically achieve efficient and stable blocking operation.

[0011] To solve the above-mentioned technical problems, the present invention further improves the technical solution as follows: the blocking member includes a transmission member connected to the drive motor, and the other end of the transmission member is connected to a liftable block for blocking the material cart from entering the unloading platform; the block is provided with a vertically opened lifting groove on the base.

[0012] The beneficial effects of the above improvements are as follows: a stop block that can be lifted and lowered by a drive motor is provided. Once the blocking component is activated, the stop block rises through the lifting groove and blocks the material car that is about to enter the unloading platform, thus achieving a reliable and stable blocking operation.

[0013] As a further improvement of the present invention, the technical problem to be solved is: how to achieve safe and reliable transmission operation of the transmission component.

[0014] To solve the above-mentioned technical problems, the present invention further improves the technical solution as follows: the drive motor is a rotary motor, and the transmission component is a combination of a worm gear transmission structure and a gear and toothed plate transmission structure; wherein, the worm is connected to the drive motor, the worm wheel is coaxially and fixedly connected to the gear, and the toothed plate is set on one side of the stop block.

[0015] The beneficial effects of the above improvements are as follows: the transmission components include a worm gear structure, which, by utilizing the reverse self-locking characteristic of the worm gear, can prevent the stop block from being stepped back after it is raised, thus losing its blocking ability; and the coordinated transmission of the worm gear structure and the gear plate structure in the transmission components can avoid the above situation from occurring.

[0016] As a further improvement of the present invention, the technical problem to be solved is that the stop block does not move up and down smoothly and stably in the lifting groove.

[0017] To solve the above-mentioned technical problems, the present invention further improves the technical solution by providing a guide column vertically arranged inside the lifting groove, and a guide groove that cooperates with the guide column on the side of the stop block near the guide column.

[0018] The beneficial effects of the above improvements are: by setting mutually cooperating guide grooves and guide columns, it can be further ensured that the stop block can be raised and lowered vertically and reliably within the lifting groove.

[0019] As a further improvement of the present invention, the technical problem to be solved is: how to further temporarily lock the material car that is staying in the inclined chute.

[0020] To solve the above-mentioned technical problems, the present invention further improves the technical solution as follows: the platform plate is provided with locking components for temporarily locking the material cart on both sides of the inclined groove; the locking component includes a rotating groove provided on both sides of the inclined groove, and a rotating shaft parallel to the wheel hub surface of the material cart is provided in the rotating groove; a locking rod is vertically provided in the middle of the rotating shaft, and the locking rod can rotate around the rotating shaft.

[0021] The beneficial effects of the above improvements are as follows: by temporarily rotating the locking rod, it can be flipped and flipped to lock the front end into the hub of the material cart, thereby temporarily locking the forward and backward movement of the material cart and further improving the safety of operation on the unloading platform.

[0022] As a further improvement of the present invention, the technical problem to be solved is: how the adjusting component specifically realizes the function of adjusting the length of the steel rope.

[0023] To solve the above-mentioned technical problems, the present invention further improves the technical solution as follows: the adjusting component includes a fixed seat disposed on the outside of the wall, the fixed seat having an adjusting groove; the other end of the steel rope is connected to a movable seat, the movable seat having a sliding groove that cooperates with the adjusting groove; a fastener is disposed between the adjusting groove and the sliding groove, the fastener being a bolt and nut structure.

[0024] The beneficial effects of the above improvements are as follows: by adjusting the straight groove and the sliding groove in a coordinated manner, and by setting fasteners that connect the two, they can be fixed to each other. Once the length of the steel rope is determined, the position of one end of the steel rope can be locked by the fasteners, and the adjustment operation can be completed.

[0025] As a further improvement of the present invention, the technical problem to be solved is: how to further improve the reminder effect to construction personnel when the unloading platform becomes unbalanced.

[0026] To solve the above-mentioned technical problems, the present invention further improves the technical solution by providing an alarm that is electrically connected and controlled by the balance detection element on the base.

[0027] The beneficial effects of the above improvements are: the installation of alarms that can promptly sound alerts improves the effectiveness of reminding construction workers. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0029] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0030] Figure 3 This is a top view of the structure of the present invention.

[0031] Figure 4 for Figure 3 A magnified structural diagram of part B in the middle.

[0032] Figure 5 This is a three-dimensional structural diagram of the present invention from an upward perspective.

[0033] Figure 6 for Figure 5 A magnified structural diagram of part C in the middle.

[0034] Figure 7 This is a schematic diagram of the three-dimensional connection relationship between the blocking member 34 and the drive motor 35 in this invention.

[0035] The text labels in the diagram represent: 1. Wall; 2. Ground; 3. Connecting mechanism; 4. Unloading platform component; 5. Adjusting component; 6. Steel rope; 31. Base; 32. Hinge seat; 33. Balance detection component; 34. Blocking component; 35. Drive motor; 36. Signal transmission line; 37. Alarm; 311. Connecting component; 312. Connecting area; 313. Lifting groove; 314. Guide column; 331. Photoelectric switch transmitter; 332. Horizontal channel; 333. Photoelectric switch receiver; 341. Stop block; 342. Transmission component; 343. Guide groove; 41. Platform plate; 42. Inclined groove; 43. Unloading area; 44. Lifting point; 45. Locking component; 451. Rotating groove; 452. Rotating shaft; 453. Locking rod; 51. Fixed seat; 511. Adjusting straight groove; 52. Movable seat; 521. Slide groove; 53. Fastener. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0037] Example 1:

[0038] A construction site unloading platform includes a connecting mechanism 3 and an unloading platform component 4 connected to the ground 2 via the connecting mechanism 3. The unloading platform component 4 includes a platform plate 41 with one end connected to the ground 2 and the other end extending outwards. A downward-facing inclined groove 42 is formed on the front end of the upper surface of the platform plate 41, and an unloading area 43 is provided on the upper surface of the platform plate 41 in front of the inclined groove 42. A suspension point 44 for connecting steel ropes 6 is provided on the side of the platform plate 41, and the steel ropes 6 are connected to an adjusting component 5 installed on a wall 1 via pulleys. The mechanism 3 includes a base 31 that overlaps the front end of the wall 1. The base 31 has a connecting area 312, which is fixedly connected to the wall 1 via a connector 311. The front end of the base 31 is movably connected to the rear end of the platform plate 41 via a hinge seat 32. A balance detection element 33 is provided between the bottom of the base 31 and the bottom of the platform plate 41. A blocking element 34 controlled by a drive motor 35 is provided on the base 31. The balance detection element 33 is connected to and controlled by the drive motor 35 via a signal transmission line 36.

[0039] Example 2:

[0040] As a further optimization of the above embodiments: a construction site unloading platform includes a connecting mechanism 3 and an unloading platform component 4 connected to the ground 2 via the connecting mechanism 3; the unloading platform component 4 includes a platform plate 41 with one end connected to the ground 2 and the other end extending outward, the upper surface of the platform plate 41 having a downward-facing inclined groove 42, and the upper surface of the platform plate 41 having an unloading area 43 in front of the inclined groove 42; the side of the platform plate 41 has a suspension point 44 for connecting steel ropes 6, and the steel ropes 6 are connected to an adjusting component 5 set on the wall 1 via pulleys. The connection mechanism 3 includes a base 31 that overlaps the front end of the wall 1. A connection area 312 is provided on the base 31, and the connection area 312 is fixedly connected to the wall 1 via a connector 311. The front end of the base 31 is movably connected to the rear end of the platform plate 41 via a hinge seat 32. A balance detection element 33 is provided between the bottom of the base 31 and the bottom of the platform plate 41. A blocking element 34 controlled by a drive motor 35 is provided on the base 31. The balance detection element 33 is connected to and controlled by the drive motor 35 via a signal transmission line 36. The balance detection element 33 includes a photoelectric switch receiver 333 disposed opposite to the bottom of the base 31 and a photoelectric switch transmitter 331 disposed opposite to the bottom of the platform plate 41. A horizontal channel 332, parallel to the ground 2, is provided between the photoelectric switch receiver 333 and the photoelectric switch transmitter 331 to limit the angle of the light path. The photoelectric switch receiver 333 is connected to and controlled by the drive motor 35 via a signal transmission line 36.

[0041] Example 3:

[0042] As a further optimization of the above embodiments: a construction site unloading platform includes a connecting mechanism 3 and an unloading platform component 4 connected to the ground 2 via the connecting mechanism 3; the unloading platform component 4 includes a platform plate 41 with one end connected to the ground 2 and the other end extending outward, the upper surface of the platform plate 41 having a downward-facing inclined groove 42, and the upper surface of the platform plate 41 having an unloading area 43 in front of the inclined groove 42; the side of the platform plate 41 has a suspension point 44 for connecting steel ropes 6, and the steel ropes 6 are connected to an adjusting component 5 set on the wall 1 via pulleys. The connection mechanism 3 includes a base 31 that overlaps the front end of the wall 1. A connection area 312 is provided on the base 31, and the connection area 312 is fixedly connected to the wall 1 via a connector 311. The front end of the base 31 is movably connected to the rear end of the platform plate 41 via a hinge seat 32. A balance detection element 33 is provided between the bottom of the base 31 and the bottom of the platform plate 41. A blocking element 34 controlled by a drive motor 35 is provided on the base 31. The balance detection element 33 is connected to and controls the drive motor 35 via a signal transmission line 36. The blocking element 34 includes a transmission element 342 connected to the drive motor 35. The other end of the transmission element 342 is connected to a liftable stop block 341 for blocking material carts from entering the unloading platform. The stop block 341 is provided in a vertically opened lifting groove 313 on the base 31.

[0043] Example 4:

[0044] As a further optimization of the above embodiments: a construction site unloading platform includes a connecting mechanism 3 and an unloading platform component 4 connected to the ground 2 via the connecting mechanism 3; the unloading platform component 4 includes a platform plate 41 with one end connected to the ground 2 and the other end extending outward, the upper surface of the platform plate 41 having a downward-facing inclined groove 42, and the upper surface of the platform plate 41 having an unloading area 43 in front of the inclined groove 42; the side of the platform plate 41 has a suspension point 44 for connecting steel ropes 6, and the steel ropes 6 are connected to an adjusting component 5 set on the wall 1 via pulleys. The connection mechanism 3 includes a base 31 that overlaps the front end of the wall 1. A connection area 312 is provided on the base 31, and the connection area 312 is fixedly connected to the wall 1 via a connector 311. The front end of the base 31 is movably connected to the rear end of the platform plate 41 via a hinge seat 32. A balance detection element 33 is provided between the bottom of the base 31 and the bottom of the platform plate 41. A blocking element 34 controlled by a drive motor 35 is provided on the base 31. The balance detection element 33 is connected to and controls the drive motor 35 via a signal transmission line 36. The blocking element 34 includes a transmission element 342 connected to the drive motor 35. The other end of the transmission element 342 is connected to a liftable stop block 341 for blocking material carts from entering the unloading platform. The stop block 341 is provided in a vertically opened lifting groove 313 on the base 31. The drive motor 35 is a rotary motor, and the transmission component 342 is a combination of a worm gear transmission structure and a gear and toothed plate transmission structure; wherein, the worm is connected to the drive motor 35, the worm gear is coaxially and fixedly connected to the gear, and the toothed plate is set on one side of the stop block 341.

[0045] Example 5:

[0046] As a further optimization of the above embodiments: a construction site unloading platform includes a connecting mechanism 3 and an unloading platform component 4 connected to the ground 2 via the connecting mechanism 3; the unloading platform component 4 includes a platform plate 41 with one end connected to the ground 2 and the other end extending outward, the upper surface of the platform plate 41 having a downward-facing inclined groove 42, and the upper surface of the platform plate 41 having an unloading area 43 in front of the inclined groove 42; the side of the platform plate 41 has a suspension point 44 for connecting steel ropes 6, and the steel ropes 6 are connected to an adjusting component 5 set on the wall 1 via pulleys. The connection mechanism 3 includes a base 31 that overlaps the front end of the wall 1. A connection area 312 is provided on the base 31, and the connection area 312 is fixedly connected to the wall 1 via a connector 311. The front end of the base 31 is movably connected to the rear end of the platform plate 41 via a hinge seat 32. A balance detection element 33 is provided between the bottom of the base 31 and the bottom of the platform plate 41. A blocking element 34 controlled by a drive motor 35 is provided on the base 31. The balance detection element 33 is connected to and controls the drive motor 35 via a signal transmission line 36. The blocking element 34 includes a transmission element 342 connected to the drive motor 35. The other end of the transmission element 342 is connected to a liftable stop block 341 for blocking material carts from entering the unloading platform. The stop block 341 is provided in a vertically opened lifting groove 313 on the base 31. A guide post 314 is vertically arranged inside the lifting groove 313, and a guide groove 343 that cooperates with the stop block 341 is provided on the side near the guide post 314.

[0047] Example 6:

[0048] As a further optimization of the above embodiments: a construction site unloading platform includes a connecting mechanism 3 and an unloading platform component 4 connected to the ground 2 via the connecting mechanism 3; the unloading platform component 4 includes a platform plate 41 with one end connected to the ground 2 and the other end extending outward, the upper surface of the platform plate 41 having a downward-facing inclined groove 42, and the upper surface of the platform plate 41 having an unloading area 43 in front of the inclined groove 42; the side of the platform plate 41 has a suspension point 44 for connecting steel ropes 6, and the steel ropes 6 are connected to an adjusting component 5 set on the wall 1 via pulleys. The connection mechanism 3 includes a base 31 that overlaps the front end of the wall 1. The base 31 has a connection area 312, which is fixedly connected to the wall 1 via a connector 311. The front end of the base 31 is movably connected to the rear end of the platform plate 41 via a hinge seat 32. A balance detection component 33 is provided between the bottom of the base 31 and the bottom of the platform plate 41. A blocking component 34 controlled by a drive motor 35 is provided on the base 31. The balance detection component 33 is connected to and controlled by the drive motor 35 via a signal transmission line 36. The platform plate 41 has locking components 45 for temporarily locking the material cart on both sides of the inclined groove 42. The locking component 45 includes a rotating groove 451 on both sides of the inclined groove 42. A rotating shaft 452 parallel to the wheel hub surface of the material cart is provided in the rotating groove 451. A locking rod 453 is vertically provided in the middle of the rotating shaft 452. The locking rod 453 can rotate around the rotating shaft 452.

[0049] Example 7:

[0050] As a further optimization of the above embodiments: a construction site unloading platform includes a connecting mechanism 3 and an unloading platform component 4 connected to the ground 2 via the connecting mechanism 3; the unloading platform component 4 includes a platform plate 41 with one end connected to the ground 2 and the other end extending outward, the upper surface of the platform plate 41 having a downward-facing inclined groove 42, and the upper surface of the platform plate 41 having an unloading area 43 in front of the inclined groove 42; the side of the platform plate 41 has a suspension point 44 for connecting steel ropes 6, and the steel ropes 6 are connected to an adjusting component 5 set on the wall 1 via pulleys. The connecting mechanism 3 includes a base 31 that overlaps the front end of the wall 1. The base 31 has a connecting area 312, which is fixedly connected to the wall 1 via a connector 311. The front end of the base 31 is movably connected to the rear end of the platform plate 41 via a hinge seat 32. A balance detection component 33 is provided between the bottom of the base 31 and the bottom of the platform plate 41. A blocking component 34 controlled by a drive motor 35 is provided on the base 31. The balance detection component 33 is connected to and controlled by the drive motor 35 via a signal transmission line 36. The adjusting component 5 includes a fixed seat 51 located on the outside of the wall 1. The fixed seat 51 has an adjusting groove 511. The other end of the steel rope 6 is connected to a movable seat 52. The movable seat 52 has a sliding groove 521 that cooperates with the adjusting groove 511. A fastener 53, which is a bolt and nut structure, is provided between the adjusting groove 511 and the sliding groove 521.

[0051] Example 8:

[0052] As a further optimization of the above embodiments: a construction site unloading platform includes a connecting mechanism 3 and an unloading platform component 4 connected to the ground 2 via the connecting mechanism 3; the unloading platform component 4 includes a platform plate 41 with one end connected to the ground 2 and the other end extending outward, the upper surface of the platform plate 41 having a downward-facing inclined groove 42, and the upper surface of the platform plate 41 having an unloading area 43 in front of the inclined groove 42; the side of the platform plate 41 has a suspension point 44 for connecting steel ropes 6, and the steel ropes 6 are connected to an adjusting component 5 set on the wall 1 via pulleys. The connection mechanism 3 includes a base 31 that overlaps the front end of the wall 1. A connection area 312 is provided on the base 31, and the connection area 312 is fixedly connected to the wall 1 via a connector 311. The front end of the base 31 is movably connected to the rear end of the platform plate 41 via a hinge seat 32. A balance detection element 33 is provided between the bottom of the base 31 and the bottom of the platform plate 41. A blocking element 34 controlled by a drive motor 35 is provided on the base 31. The balance detection element 33 is connected to and controlled by the drive motor 35 via a signal transmission line 36. An alarm 37 electrically connected to and controlled by the balance detection element 33 is also provided on the base 31.

[0053] When the device is working, the purpose of setting the inclined groove 42 on the platform plate 41 is to facilitate the placement of the unloading car, so as to avoid the unloading car rushing out or being unable to move onto the platform plate 41 when it is unbalanced, thus making it easy to place on the platform plate 41. If the unloading platform is in a balanced state, the light emitted by the photoelectric switch transmitter 331 can completely reach the photoelectric switch receiver 333 through the horizontal channel 332. If the unloading platform is unbalanced, regardless of whether it is tilted upwards or downwards, the light from the photoelectric switch transmitter 331 can only reach the front end of the horizontal channel 332 along the bottom of the platform plate 41, but cannot reach the rear end through the horizontal channel 332. The photoelectric switch receiver 333 cannot receive the light, thus triggering and controlling the blocking component 34 to start. Once the blocking component 34 is controlled to start, the stop block 341 rises up through the lifting groove 313 and blocks the material car about to enter the unloading platform.

[0054] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0055] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of the present invention, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A construction site unloading platform, characterized by: The connecting mechanism (3) and the unloading platform part (4) connected with the ground (2) through the connecting mechanism (3); the unloading platform part (4) comprises a platform plate (41) with one end connected with the ground (2) and the other end extending outward, a chute (42) is opened downward at the front end of the upper surface of the platform plate (41), and an unloading area (43) is arranged on the upper surface of the platform plate (41) in front of the chute (42); the side of the platform plate (41) is provided with a lifting point (44) connected with a steel rope (6), the steel rope (6) is connected with an adjusting part (5) arranged on the wall body (1) through a pulley; the connecting mechanism (3) comprises a base (31) overlapped on the front end of the wall body (1), a connecting area (312) is arranged on the base (31), and the connecting area (312) is fixedly connected with the wall body (1) through a connecting piece (311); the front end of the base (31) is movably connected with the rear end of the platform plate (41) through a hinge seat (32), and a balance detection part (33) is arranged between the bottom of the base (31) and the bottom of the platform plate (41); the base (31) is provided with a blocking part (34) controlled by a driving motor (35), and the balance detection part (33) is connected with the driving motor (35) through a signal transmission line (36); the balance detection part (33) comprises a photoelectric switch receiving end (333) oppositely arranged on the bottom of the base (31) and a photoelectric switch emitting end (331) arranged on the bottom of the platform plate (41), a horizontal channel (332) parallel to the ground (2) for limiting the angle of the light path is arranged between the photoelectric switch receiving end (333) and the photoelectric switch emitting end (331); the photoelectric switch receiving end (333) is connected with the driving motor (35) through the signal transmission line (36); the blocking part (34) comprises a transmission part (342) connected with the driving motor (35), and the other end of the transmission part (342) is drivingly connected with a liftable blocking block (341) for blocking the material car from entering the unloading platform; the blocking block (341) is arranged in a lifting groove (313) vertically arranged on the base (31); the driving motor (35) is a rotary motor, and the transmission part (342) is a combination of a worm and gear transmission structure and a gear and tooth plate transmission structure; wherein the worm is connected with the driving motor (35), the worm wheel is coaxially fixedly connected with the gear, and the tooth plate is arranged on one side of the blocking block (341).

2. A building site unloading platform according to claim 1, characterised in that: A guide column (314) is vertically arranged in the inner side of the lifting groove (313), and the blocking block (341) is provided with a guide groove (343) matched therewith on the side close to the guide column (314).

3. A building site unloading platform according to claim 1, characterised in that: Locking parts (45) for temporarily locking the material car are arranged on both sides of the chute (42) of the platform plate (41); the locking part (45) comprises a rotating groove (451) arranged on both sides of the chute (42), and a rotating shaft (452) parallel to the hub surface of the material car is arranged in the rotating groove (451); a locking rod (453) is vertically arranged in the middle of the rotating shaft (452), and the locking rod (453) can rotate around the rotating shaft (452).

4. A building site unloading platform according to claim 1, characterised in that: The adjusting part (5) comprises a fixing base (51) arranged outside the wall body (1), and the fixing base (51) is provided with an adjusting straight slot (511); the other end of the steel rope (6) is connected with a movable base (52), and the movable base (52) is provided with a sliding slot (521) matched with the adjusting straight slot (511); the adjusting straight slot (511) and the sliding slot (521) are provided with a fastener (53), and the fastener (53) is a bolt-nut structure.

5. A construction site unloading platform according to claim 1, wherein: The base (31) is further provided with an alarm (37) electrically connected and controlled by the balance detecting part (33).

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