A unloading platform for construction

Abstract

The present invention belongs to the technical field of construction equipment, and discloses a material unloading platform for construction, including a mounting platform, the front end of which is fixedly connected to the building ground, and also including: side panels symmetrically fixed to both sides of the top surface of the mounting platform, a rear panel fixedly connected to the rear end of the top surface of the mounting platform, a loading mechanism and a transmission mechanism. The present invention realizes the function of automatically transporting building materials to the front end of the unloading platform and automatically returning after the building materials are moved away, preventing the building materials from being directly placed on the transmission structure such as the screw rod due to forgetting to return the loading platform, causing damage to parts, and at the same time using the above scheme to control the movement of the loading mechanism, there is no need to control the motor to switch the working direction, reducing the premature aging damage of the motor after frequent switching of the output direction.

Description

Technical Field

[0001] The invention belongs to the technical field of construction equipment, in particular to a material unloading platform for construction. Background Art

[0002] Most of the existing unloading platforms used in construction refer to cantilevers, which are tools used to receive building materials such as bricks bundled and placed on pallets that are transferred by tower cranes. Most of them are hangers or hanging structures attached to the exterior walls of buildings. Steel cables and fasteners are usually used to fix the cantilevers on the required floors, and then the staff use manual forklifts to transfer the building materials on the cantilevers to the floor slabs.

[0003] Because the cantilevered loading structure is a suspended structure extending out of the floor slab, when the staff enters the cantilever and uses a forklift to unload the goods, the staff needs to walk to the loading platform of the suspended part of the cantilever, which has the risk of falling objects and people falling from the edge, posing a safety hazard. Therefore, some schemes now use a screw rod to drive the loading platform to move back and forth, and move the loading platform to the part of the cantilever fixed on the floor. Although the above scheme avoids the staff from approaching the suspended end of the cantilever, it is still necessary to manually control the loading platform to return. When the staff forgets to control the loading platform to return, the tower crane operator will transfer the construction materials into the cantilever at this time, and the construction materials will fall directly outside the loading platform. At this time, the construction materials will directly contact the transmission components such as the screw rod, causing damage to internal parts, thereby causing damage to the cantilever and causing the construction materials to fall from it, causing injuries to the construction workers passing below. At the same time, the loading platform will shake when using a manual forklift to unload, increasing safety hazards. Summary of the invention

[0004] The object of the present invention is to provide a material unloading platform for construction to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a material unloading platform for construction, comprising a mounting platform, the front end of which is fixedly connected to the building ground, and further comprising:

[0006] Side plates are symmetrically fixed on both sides of the top surface of the mounting platform, the inner side of the side plates is provided with a first groove and symmetrical first slide grooves located at upper and lower sides of the first groove, a plurality of double-layer sprockets are rotatably mounted inside the side plates, and the plurality of double-layer sprockets are meshed with chains;

[0007] A rear side plate fixedly connected to the rear end of the top surface of the mounting platform;

[0008] The object-carrying mechanism comprises an outer sliding frame slidably connected between the two side panels, both sides of the outer sliding frame are fixedly connected with symmetrical first sliding blocks, the first sliding blocks are slidably connected in the corresponding first sliding grooves, a plurality of flat cylinders are fixedly connected to the inner bottom surface of the outer sliding frame, an inner object-carrying frame is slidably connected inside the outer sliding frame, the outer bottom surface of the inner object-carrying frame is connected to the telescopic end of the flat cylinder, the inner object-carrying frame slides up and down inside the outer sliding frame, and second sliding grooves are provided on both sides of the outer sliding frame and the inner object-carrying frame facing the side panels;

[0009] The transmission mechanism includes a first transmission block and a second transmission block, wherein the first transmission block and the second transmission block are both located inside the side plate, and both are fixedly connected with a second slider on the side facing the outer sliding frame, and the second slider is slidably connected in the second sliding groove, and teeth are provided at the upper and lower ends of the first transmission block and the second transmission block, and the teeth are inserted into the chain and meshed with the chain after moving up and down.

[0010] Preferably, the rear plate is slidably connected to a locking block on the side of the carrying mechanism, the side of the locking block is provided with an arc recess and a locking plane, the end of the locking block away from the carrying mechanism is fixedly connected to a first spring, the first spring pushes the locking block to slide outward, and the locking plane always remains in a horizontal state.

[0011] Preferably, both sides of the rear plate close to the side plates are rotatably mounted with rotating shafts, the sides of the rotating shafts are provided with locking notches, and the diameter of the circular arc recess is greater than or equal to the diameter of the rotating shaft.

[0012] Preferably, a torsion spring is sleeved on the rotating shaft, and two ends of the torsion spring are fixedly connected to the rotating shaft and the rear plate respectively. When the rotating shaft is stationary, the bottom surface of the locking notch is parallel to the top surface of the locking plane.

[0013] Preferably, the inner top surface of the inner loading frame is provided with symmetrical unloading grooves, the outer sliding frame and both sides of the inner loading frame close to the side panels are provided with locking holes, the inner sides of the side panels are also provided with locking holes, the locking holes on the inner loading frame are communicated with the unloading groove, and a locking rod is slidably connected thereto, and a ramp block is fixedly connected to one end of the locking rod facing the unloading groove, and a return spring is sleeved on the locking rod.

[0014] Preferably, when a manual forklift is used for unloading, after the fork tip of the manual forklift extends into the unloading groove, the locking rod moves toward the side plate and fixes the loading mechanism relative to the side plate.

[0015] Preferably, one end of the rotating shaft passes through and extends into the interior of the side plate and is fixedly connected to a first inclined block, the other end of the interior of the side plate is fixedly connected to a second inclined block, and the side of the first transmission block facing the first inclined block and the side of the second transmission block facing the second inclined block are both provided with inclined notches.

[0016] Preferably, the first transmission block and the second transmission block are fixed to each other by a connecting rod, and after the inclined notch on the first transmission block contacts the first inclined block, the transmission mechanism moves downward, and after the inclined notch on the second transmission block contacts the second inclined block, the transmission mechanism moves upward.

[0017] Preferably, a guide slope is fixedly connected to the top surface of the mounting platform, a limiting groove communicating with the material discharge groove is provided on the guide slope, and a vertical side of the guide slope is connected to the front side of the side plate.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The present invention cooperates with the chain, the carrying mechanism and the transmission mechanism. After the crane transfers the bundled building materials to the inside of the inner carrying frame, when the inner carrying frame drives the transmission mechanism to move upward, the teeth on the top of the first transmission block and the second transmission block are embedded in the chain and meshed with it. As the chain rotates, the carrying mechanism returns. When it is about to return to the starting position, the outer sliding frame has not yet contacted the locking block. At this time, the locking plane is engaged with the locking notch, so that the rotating shaft cannot rotate, thereby fixing the first inclined block. As the first transmission block contacts the first inclined block, the first transmission block moves downward, and the first transmission block is moved downward. The transmission mechanism moves downward. At this time, the teeth at the upper and lower ends of the first transmission block and the second transmission block are not in contact with the chain, so that the carrying mechanism completes the return journey and stops. This design eliminates the need for additional control of the start and stop of the carrying mechanism, and realizes the function of automatically transporting building materials to the front end of the unloading platform and automatically returning after the building materials are moved away, thereby preventing the building materials from being directly placed on transmission structures such as the screw rod due to forgetting to return the carrying platform, causing damage to parts. At the same time, the above scheme is used to control the movement of the carrying mechanism, and there is no need to control the motor to switch the working direction, thereby reducing premature aging and damage of the motor after frequent switching of the output direction.

[0020] 2. Secondly, the present invention provides a material discharge groove and a locking rod. When a manual forklift is used to transfer the construction materials inside the inner loading frame, the fork tip of the forklift is pushed inward along the material discharge groove. At this time, the fork tip will push the locking rod outward. At this time, the locking rod passes through the locking holes on the inner loading frame, the outer sliding frame and the side panels to lock the loading mechanism and the side panels. As the forklift leaves the material discharge groove, the inner loading frame is lifted up by the flat cylinder, so that the transmission mechanism contacts the chain, driving the loading mechanism to return to the starting position, thereby preventing the loading mechanism from shaking and the inner loading frame from moving up prematurely when the manual forklift is used to move the construction materials from the loading mechanism, thereby ensuring stability during the unloading process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 It is a cross-sectional schematic diagram of a side panel of the present invention;

[0024] Figure 4 It is a cross-sectional schematic diagram of the rear side plate of the present invention;

[0025] Figure 5 This is a schematic diagram of the locking block structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the rotating shaft structure of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the object-carrying mechanism of the present invention;

[0028] Figure 8 It is a cross-sectional schematic diagram of the inner loading frame of the present invention;

[0029] Fig. 9 For the present invention Figure 8 Enlarged view of point B in the middle;

[0030] Fig.10 It is a schematic diagram of the transmission mechanism structure of the present invention.

[0031] In the figure: 1. mounting platform; 11. guide ramp; 2. side plate; 21. first groove; 22. first slide groove; 23. double-layer sprocket; 24. chain; 25. first inclined block; 26. second inclined block; 3. rear plate; 31. rotating shaft; 32. torsion spring; 33. locking block; 34. first spring; 35. arc depression; 36. locking plane; 37. locking notch; 4. loading mechanism; 41. outer sliding frame; 42. inner loading frame; 43. second slide groove; 44. unloading groove; 45. locking rod; 46. locking hole; 47. first slider; 48. flat cylinder; 49. reset spring; 5. transmission mechanism; 51. first transmission block; 52. second transmission block; 53. second slider; 54. inclined notch. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figures 1 to 10 As shown, an embodiment of the present invention provides a material unloading platform for construction, including a mounting platform 1, the front end of which is fixedly connected to the building ground, and further comprising:

[0034] The side plate 2 is symmetrically fixed on both sides of the top surface of the mounting platform 1. The inner side of the side plate 2 is provided with a first groove 21 and symmetrical first slide grooves 22 located at the upper and lower sides of the first groove 21. A plurality of double-layer sprockets 23 are rotatably installed inside the side plate 2. The plurality of double-layer sprockets 23 are meshed with chains 24.

[0035] A rear side plate 3, which is fixedly connected to the rear end of the top surface of the mounting platform 1;

[0036] The object-carrying mechanism 4 comprises an outer sliding frame 41 slidably connected between the two side panels 2, both sides of the outer sliding frame 41 are fixedly connected with symmetrical first sliding blocks 47, the first sliding blocks 47 are slidably connected in the corresponding first sliding grooves 22, a plurality of flat cylinders 48 are fixedly connected to the inner bottom surface of the outer sliding frame 41, an inner object-carrying frame 42 is slidably connected inside the outer sliding frame 41, the outer bottom surface of the inner object-carrying frame 42 is connected to the telescopic end of the flat cylinder 48, the inner object-carrying frame 42 slides up and down inside the outer sliding frame 41, and second sliding grooves 43 are provided on both sides of the outer sliding frame 41 and the inner object-carrying frame 42 facing the side panels 2;

[0037] The transmission mechanism 5 includes a first transmission block 51 and a second transmission block 52. The first transmission block 51 and the second transmission block 52 are both located inside the side plate 2, and the sides of both facing the outer sliding frame 41 are fixedly connected with a second slider 53. The second slider 53 is slidably connected in the second slide groove 43. The upper and lower ends of the first transmission block 51 and the second transmission block 52 are provided with teeth. After moving up and down, the teeth are inserted into the chain 24 and meshed with it. The second slider 53 is interference fit with the second slide groove 43, so that when the second slider 53 is not in contact with other components, the second slider 53 remains stationary in the second slide groove 43.

[0038] In the present invention, by the cooperation of the chain 24, the loading mechanism 4 and the transmission mechanism 5, after the crane transfers the bundled building materials to the inside of the inner loading frame 42, the telescopic end of the flat cylinder 48 retracts under the influence of the gravity of the building materials, so that the inner loading frame 42 moves downward, and the transmission mechanism 5 moves downward together. At this time, one side of the outer sliding frame 41 abuts against one side of the rear plate 3, so that the locking block 33 is pushed inward, so that the rotating shaft 31 is located in the arc recess 35 on the locking block 33. At this time, the downward movement of the transmission mechanism 5 causes the first inclined block 25 to rotate, and does not cause the transmission mechanism 5 to move upward. After the transmission mechanism 5 moves downward, the teeth on the bottom surfaces of the first transmission block 51 and the second transmission block 52 are embedded in the chain 24. At this time, the movement of the chain 24 drives the transmission mechanism 5 to move away from the rear plate 3, thereby driving the object-carrying mechanism 4 to move together. When the transmission mechanism 5 moves to the other end, as the second transmission block 52 contacts the second inclined block 26, the transmission mechanism 5 is pushed upward, and the teeth on the bottom surfaces of the first transmission block 51 and the second transmission block 52 are disengaged from the chain 24. At this time, the transmission mechanism 5 and the object-carrying mechanism 4 no longer move. After the building materials inside the object-carrying mechanism 4 are moved away, the flat gas The telescopic end of the cylinder 48 is extended again, so that the inner loading frame 42 drives the transmission mechanism 5 to move upward together. At this time, the teeth on the top of the first transmission block 51 and the second transmission block 52 are embedded in the chain 24 and meshed therewith. As the chain 24 rotates, the loading mechanism 4 returns. When it is about to return to the starting position, the outer sliding frame 41 has not yet contacted the locking block 33. At this time, the locking plane 36 is engaged with the locking notch 37, so that the rotating shaft 31 cannot rotate, thereby fixing the first inclined block 25. As the first transmission block 51 contacts the first inclined block 25, the first transmission block 51 moves downward, thereby causing the transmission mechanism 5 to move upward. The first transmission block 51 and the second transmission block 52 move downward, at this time, the teeth at the upper and lower ends of the first transmission block 51 and the second transmission block 52 do not contact the chain 24, so that the carrying mechanism 4 completes the return journey and stops. This design makes it unnecessary to additionally control the start and stop of the carrying mechanism 4, and realizes the function of automatically transporting the building materials to the front end of the unloading platform and automatically returning after the building materials are moved away, thereby preventing the building materials from being directly placed on the transmission structure such as the screw rod due to forgetting to return the carrying platform, causing damage to parts. At the same time, the above-mentioned scheme is used to control the movement of the carrying mechanism 4, and there is no need to control the motor to switch the working direction, thereby reducing the premature aging and damage of the motor after frequent switching of the output direction.

[0039] Secondly, the present invention provides a material discharge groove 44 and a locking rod 45. When a manual forklift is used to transfer the construction materials inside the inner loading frame 42, the fork tip of the forklift is pushed inward along the material discharge groove 44. At this time, the fork tip will push the locking rod 45 outward. At this time, the locking rod 45 passes through the locking holes 46 on the inner loading frame 42, the outer sliding frame 41 and the side plate 2 to lock the loading mechanism 4 and the side plate 2. As the forklift leaves the material discharge groove 44, the inner loading frame 42 is lifted up by the flat cylinder 48, so that the transmission mechanism 5 contacts the chain 24, and drives the loading mechanism 4 to return to the starting position, thereby preventing the loading mechanism 4 from shaking and the inner loading frame 42 from moving up prematurely when the manual forklift is used to move the construction materials from the loading mechanism 4, thereby ensuring stability during the unloading process.

[0040] like Figures 4 to 6 As shown, the rear plate 3 is slidably connected to the side of the carrying mechanism 4 with a locking block 33, and the side of the locking block 33 is provided with an arc recess 35 and a locking plane 36. The end of the locking block 33 away from the carrying mechanism 4 is fixedly connected with a first spring 34, and the first spring 34 pushes the locking block 33 to slide outward, and the locking plane 36 always remains in a horizontal state. The rear plate 3 is rotatably installed with a rotating shaft 31 on both sides close to the side plates 2, and a locking notch 37 is provided on the side of the rotating shaft 31. The diameter of the arc recess 35 is greater than or equal to the diameter of the rotating shaft 31. A torsion spring 32 is sleeved on the rotating shaft 31, and the two ends of the torsion spring 32 are respectively fixedly connected to the rotating shaft 31 and the rear plate 3. When the rotating shaft 31 is stationary, the bottom surface of the locking notch 37 is parallel to the top surface of the locking plane 36.

[0041] The torsion spring 32 is provided to return the rotating shaft 31 to the normal position. When the carrying mechanism 4 is located at the starting position, the outer sliding frame 41 pushes the locking block 33 inward, so that the rotating shaft 31 is located at the arc recess 35 of the locking block 33. At this time, the rotating shaft 31 can rotate freely, so that the first transmission block 51 will not contact the first inclined block 25 during the downward movement, causing the transmission mechanism 5 to be unable to move, thereby causing the carrying mechanism 4 to be unable to be driven by the chain 24 to move.

[0042] like Figure 1 , Figures 7 to 9 As shown, the inner top surface of the inner loading frame 42 is provided with symmetrical unloading grooves 44, the outer sliding frame 41 and the inner loading frame 42 are provided with locking holes 46 on both sides close to the side panels 2, and the inner side of the side panels 2 is also provided with locking holes 46. The locking holes 46 on the inner loading frame 42 are communicated with the unloading groove 44, and a locking rod 45 is slidably connected thereto. The locking rod 45 is fixedly connected to an inclined block at one end thereof facing the unloading groove 44, and a return spring 49 is sleeved on the locking rod 45. When a manual forklift is used for unloading, after the fork tip of the manual forklift is extended into the unloading groove 44, the locking rod 45 moves toward the side panel 2 and fixes the loading mechanism 4 and the side panel 2 relatively.

[0043] The setting of the material discharge groove 44 makes it convenient to push a forklift into and lift up the building materials for transportation. When the forklift is pushed into the material discharge groove 44, the fork tip of the forklift pushes the locking rod 45 to both sides, thereby allowing the locking rod 45 to pass through the locking holes 46 opened on the outer sliding frame 41 and the side panels 2. At this time, the loading mechanism 4 is relatively fixed to the side panels 2 to prevent the loading mechanism 4 from moving during the movement of the forklift, causing instability of the forklift and the building materials.

[0044] like Figure 3 , Figure 6 and Fig.10 As shown, one end of the rotating shaft 31 passes through and extends into the interior of the side plate 2 and is fixedly connected to the first inclined block 25, and the other end of the interior of the side plate 2 is fixedly connected to the second inclined block 26. The first transmission block 51 is provided with an inclined notch 54 on the side facing the first inclined block 25 and the second transmission block 52 is provided with an inclined notch 54 on the side facing the second inclined block 26. The first transmission block 51 and the second transmission block 52 are fixed to each other by a connecting rod. After the inclined notch 54 on the first transmission block 51 contacts the first inclined block 25, the transmission mechanism 5 moves downward, and after the inclined notch 54 on the second transmission block 52 contacts the second inclined block 26, the transmission mechanism 5 moves upward.

[0045] When the carrying mechanism 4 is in the starting position, that is, close to the rear plate 3, as the building materials are placed in the carrying mechanism 4, the inner carrying frame 42 moves downward, driving the transmission mechanism 5 to move downward. At this time, the cooperation between the transmission mechanism 5 and the chain 24 drives the carrying mechanism 4 to move away from the rear plate 3. After reaching the guide slope 11, the second transmission block 52 contacts the second inclined block 26 and moves upward, driving the transmission mechanism 5 to move upward. At this time, the transmission mechanism 5 is no longer in contact with the chain 24. When the building materials in the carrying mechanism 4 are moved away, the inner carrying frame 42 moves upward, driving the transmission mechanism 5 to move upward and contact the chain 24. At this time, the chain 24 drives the transmission mechanism 5 and the carrying mechanism 4 to return, realizing automatic transportation of building materials to the bottom of the floor. At the same time, the function of automatic return after the building materials are moved away prevents the operator from forgetting to control the return of the carrying mechanism 4, resulting in the subsequent hoisting of building materials not falling into the carrying mechanism 4, causing the equipment to be stuck.

[0046] like Figure 1 As shown, a guide slope 11 is fixedly connected to the top surface of the mounting platform 1, and a limit groove communicating with the material discharge groove 44 is provided on the guide slope 11. The vertical edge of the guide slope 11 is connected to the front side of the side plate 2. When a manual forklift is used to transfer the construction materials in the loading mechanism 4, the fork tip of the forklift is moved along the limit groove to push it into the material discharge groove 44, which facilitates the forklift to position.

[0047] Working principle:

[0048] When using the present invention, first use a power source such as a motor to drive the double-layer sprocket 23 to rotate, thereby driving the chain 24 to move, and then use a crane or other device to lift the building materials into the loading mechanism 4. At this time, the telescopic end of the flat cylinder 48 in the loading mechanism 4 retracts after the gravity changes, causing the inner loading frame 42 to move downward, and at the same time, the inner loading frame 42 drives the transmission mechanism 5 to move downward. At this time, the first transmission block 51 and the second transmission block 52 in the transmission mechanism 5 are in contact with the chain 24, and the chain 24 drives the transmission mechanism 5 to move in the direction of the second inclined block 26, thereby causing the loading mechanism 4 to move together.

[0049] When the carrying mechanism 4 moves to the second inclined block 26, the second transmission block 52 contacts the second inclined block 26 and moves upward, thereby moving the transmission mechanism 5 upward, so that the first transmission block 51 and the second transmission block 52 no longer contact the chain 24, thereby making the carrying mechanism 4 stationary, which is convenient for subsequent transportation.

[0050] When using a forklift to transport construction materials, the fork tip of the forklift is pushed inward along the unloading groove 44, so that the locking rod 45 extends to both sides and passes through the locking holes 46 opened on the outer sliding frame 41 and the side plate 2, so that the inner loading frame 42, the outer sliding frame 41 and the side plate 2 are relatively fixed.

[0051] When the forklift moves the construction materials away from the loading mechanism 4, the telescopic end of the flat cylinder 48 is extended again due to the reduction of gravity above, so that the inner loading frame 42 moves upward, driving the transmission mechanism 5 to move upward. At this time, the first transmission block 51 and the second transmission block 52 contact the chain 24 again, and are driven by the chain 24 to move in the direction of the first inclined block 25 for the return journey. When the first transmission block 51 contacts the first inclined block 25 and moves downward, it drives the transmission mechanism 5 to move downward, thereby resetting the transmission mechanism 5.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A material unloading platform for construction, comprising a mounting platform (1), wherein the front end of the mounting platform (1) is fixedly connected to the building ground, characterized in that: Also includes: A side plate (2) symmetrically fixed on both sides of the top surface of the mounting platform (1); a first groove (21) and symmetrical first slide grooves (22) located on the upper and lower sides of the first groove (21) are formed on the inner side of the side plate (2); a plurality of double-layer sprocket wheels (23) are rotatably mounted inside the side plate (2); and the plurality of double-layer sprocket wheels (23) are meshed with chains (24); A rear side plate (3) fixedly connected to the rear end of the top surface of the mounting platform (1); A loading mechanism (4), comprising an outer sliding frame (41) slidably connected between the two side panels (2), symmetrical first sliding blocks (47) being fixedly connected on both sides of the outer sliding frame (41), the first sliding blocks (47) being slidably connected in the corresponding first sliding grooves (22), a plurality of flat cylinders (48) being fixedly connected to the inner bottom surface of the outer sliding frame (41), an inner loading frame (42) being slidably connected inside the outer sliding frame (41), the outer bottom surface of the inner loading frame (42) being connected to the telescopic end of the flat cylinder (48), the inner loading frame (42) sliding up and down inside the outer sliding frame (41), and second sliding grooves (43) being provided on both sides of the outer sliding frame (41) and the inner loading frame (42) facing the side panels (2); The transmission mechanism (5) comprises a first transmission block (51) and a second transmission block (52), wherein the first transmission block (51) and the second transmission block (52) are both located inside the side plate (2), and the sides of both of them facing the outer sliding frame (41) are fixedly connected with a second sliding block (53), and the second sliding block (53) is slidably connected in the second sliding groove (43), and the upper and lower ends of the first transmission block (51) and the second transmission block (52) are both provided with teeth, and the teeth are inserted into the chain (24) and meshed therewith after moving up and down.

2. A material unloading platform for construction according to claim 1, characterized in that: The rear plate (3) is slidably connected to a locking block (33) on the side of the object-carrying mechanism (4); a circular arc recess (35) and a locking plane (36) are provided on the side of the locking block (33); one end of the locking block (33) away from the object-carrying mechanism (4) is fixedly connected to a first spring (34); the first spring (34) pushes the locking block (33) to slide outwards; and the locking plane (36) always maintains a horizontal state.

3. A material unloading platform for construction according to claim 2, characterized in that: A rotating shaft (31) is rotatably mounted on both sides of the rear plate (3) close to the side plates (2), a locking notch (37) is provided on the side of the rotating shaft (31), and the diameter of the circular arc recess (35) is greater than or equal to the diameter of the rotating shaft (31).

4. A material unloading platform for construction according to claim 3, characterized in that: A torsion spring (32) is sleeved on the rotating shaft (31), and two ends of the torsion spring (32) are respectively fixedly connected to the rotating shaft (31) and the rear plate (3), and when the rotating shaft (31) is stationary, the bottom surface of the locking notch (37) is parallel to the top surface of the locking plane (36).

5. A material unloading platform for construction according to claim 4, characterized in that: The inner top surface of the inner loading frame (42) is provided with symmetrical material removal grooves (44), and the outer sliding frame (41) and the inner loading frame (42) are provided with locking holes (46) on both sides close to the side plate (2). The inner side of the side plate (2) is also provided with a locking hole (46). The locking hole (46) provided on the inner loading frame (42) is communicated with the material removal groove (44), and a locking rod (45) is slidably connected thereto. The locking rod (45) is fixedly connected to an inclined block at one end facing the material removal groove (44), and a return spring (49) is sleeved on the locking rod (45).

6. A material unloading platform for construction according to claim 5, characterized in that: When a manual forklift is used for unloading, after the fork tip of the manual forklift extends into the unloading groove (44), the locking rod (45) moves toward the side plate (2) and fixes the loading mechanism (4) relative to the side plate (2).

7. A material unloading platform for construction according to claim 6, characterized in that: One end of the rotating shaft (31) penetrates and extends into the interior of the side plate (2) and is fixedly connected to a first inclined block (25); the other end of the interior of the side plate (2) is fixedly connected to a second inclined block (26); and a side surface of the first transmission block (51) facing the first inclined block (25) and a side surface of the second transmission block (52) facing the second inclined block (26) are both provided with an inclined surface notch (54).

8. A material unloading platform for construction according to claim 7, characterized in that: The first transmission block (51) and the second transmission block (52) are fixed to each other via a connecting rod; after the inclined notch (54) on the first transmission block (51) contacts the first inclined block (25), the transmission mechanism (5) moves downward; and after the inclined notch (54) on the second transmission block (52) contacts the second inclined block (26), the transmission mechanism (5) moves upward.

9. A material unloading platform for construction according to claim 8, characterized in that: A guide slope (11) is fixedly connected to the top surface of the mounting platform (1), a limit groove communicating with the material discharge groove (44) is provided on the guide slope (11), and a vertical side of the guide slope (11) is connected to the front side of the side plate (2).

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