Building material lifting device

Abstract

The invention relates to the technical field of hoisting equipment, in particular to a building material lifting device which comprises a lifting seat, a connecting frame, a supporting plate and a base. A plurality of rollers and a hydraulic cylinder are arranged on the base; a motor is arranged on the lifting seat, a winding roller is coaxially connected to an output shaft of the motor, and the winding roller is connected to the connecting frame through a plurality of lifting ropes; a containing cavity is formed in the bottom of the connecting frame, and clamping grooves are formed in the cavity walls of the left side and the right side of the containing cavity. A stand column is slidably connected to the supporting plate in the vertical direction, and the stand column and the supporting plate are jointly connected with the same first spring. The stand column is connected with a clamping plate through a pull rope, the supporting plate is provided with a first guide wheel for the pull rope to wind around, and the clamping plate and the supporting plate are jointly connected with the same second spring. The clamping plate is provided with a first guide surface which is inclined upwards; a limiting assembly is arranged on the supporting plate. The hoisting and transporting efficiency of the pipes can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of hoisting equipment, and in particular to a building material lifting device. Background Art

[0002] During the construction process, it is necessary to lift and transport building materials according to construction needs. Among them, pipes are a more commonly used building material. Pipes can not only transport fluid media such as water, gas, oil, and heat, but also serve as supporting materials for building structures.

[0003] Since the pipes have a certain weight and need to be lifted to a specified height when used, workers are required to manually limit and fix the pipes on the lifting platform before lifting and transportation of the pipes to ensure the stability of the pipes during lifting and transportation; and since the pipes have a certain length and lifting ropes are installed on the left and right sides of the lifting platform, it is not easy to place the pipes on the lifting platform from the left and right sides of the lifting platform, that is, workers need to place the pipes from the front or rear end of the lifting platform in the middle of the lifting platform, which increases the distance the pipes need to be moved, increases the labor intensity of the workers, and reduces the lifting and transportation efficiency of the pipes, so improvement is needed. Summary of the invention

[0004] In order to improve the lifting and transportation efficiency of pipes, the present application provides a building material lifting device.

[0005] The construction material lifting device provided in the present application adopts the following technical solution: the construction material lifting device comprises a lifting seat, a connecting frame, a supporting plate and a base arranged in sequence from top to bottom; A plurality of rollers and a hydraulic cylinder are provided on the base, and the piston rod of the hydraulic cylinder extends in the vertical direction and is connected to the lifting seat; A motor is provided on the lifting seat, and a winding roller is coaxially connected to the output shaft of the motor. The winding roller rotates around its own axis and is connected to the lifting seat, and the winding roller is connected to the connecting frame through a plurality of suspension ropes. The bottom of the connecting frame is provided with a receiving cavity for inserting the supporting plate and the pipe, and the left and right side walls of the receiving cavity are provided with card slots; The support plate is slidably connected with a column in the vertical direction, and the column and the support plate are connected with a first spring; when the first spring is in a natural state, the upper end of the column will protrude upward from the upper surface of the support plate and be used to press down the pipe on the support plate; The column is connected to a cardboard through a pull rope, and the cardboard is provided with a first guide wheel for the pull rope to pass around. The cardboard is connected to the cardboard by sliding in the horizontal direction, and the cardboard and the cardboard are connected to the same second spring. When the column is pressed down by the pipe on the cardboard, the second spring will return to the natural state and prompt the cardboard to move to the bottom of the connecting frame. The card plate is provided with a first guide surface inclined upward, and the connecting frame can push the card plate into the accommodating cavity through the first guide surface during the descending process, and make the card slot correspond to the card plate, at this time, the second spring will return to the natural state and cause the card plate to slide and be connected to the card slot; A limiting component is provided on the supporting plate for limiting and fixing the column after the pipe is pressed down.

[0006] Optionally, the limit assembly includes a plug post that is slidably connected to the support plate in the horizontal direction, the plug post and the support plate are commonly connected to the same third spring, and a slot is provided on the side of the column; when the third spring is in a natural state, the plug post can be inserted into the slot of the column pressed down by the pipe; A guide groove is provided at the bottom of the plug column, a second guide surface inclined downward is provided on the top groove wall of the guide groove, and a top column is provided on the base; when the support plate descends and hits the base, the top column will be inserted into the guide groove and push the plug column to move out of the slot through the second guide surface.

[0007] Optionally, the base is provided with a plurality of vertically arranged limit columns, the upper ends of the limit columns are pointed, and the support plate is provided with a plurality of limit grooves for the limit columns to be inserted, and the limit grooves correspond to the limit columns one by one.

[0008] Optionally, positioning plates are provided on both the left and right sides of the support plate.

[0009] Optionally, both left and right cavity walls of the accommodating cavity are provided with positioning grooves for the positioning plates to be inserted into, the positioning grooves correspond to the positioning plates one by one, and the upper end of the positioning plates is a pointed end.

[0010] Optionally, two pressure plates are rotatably connected to the connecting frame, and the two pressure plates are respectively arranged on the left and right sides of the accommodating cavity. The pressure plates and the connecting frame are commonly connected to the same torsion spring, and the torsion spring is used to cause the pressure plates to press tightly against the pipe in the accommodating cavity.

[0011] Optionally, one end of the pressing plate is located in the accommodating cavity, and the other end of the pressing plate is located outside the accommodating cavity; Two baffles are arranged on the lifting seat. When the connecting frame rises to the lifting seat, the baffles will press down one end of the pressing plate outside the accommodating cavity, so that one end of the pressing plate inside the accommodating cavity will tilt upward.

[0012] In summary, this application includes the following beneficial technical effects: 1. When the building materials need to be transported and lifted, the pallet will be placed on the upper surface of the base, and the connecting frame will be located above the pallet and separated from the pallet. At this time, there is no connecting frame and hanging rope on the left and right sides of the pallet, so that workers can place the pipes on the upper surface of the pallet from the left and right sides of the pallet for quick loading of the pipes; 2. When the pipe is loaded, the motor will drive the roller to rotate, and the roller will unwind the sling rope, so that the connecting frame will descend. During the descent process, the connecting frame will press downward against the first guide surface, and the connecting frame will cause the clamping plate to sink into the connecting groove by its own gravity. At this time, the support plate will be embedded in the accommodating cavity; then the clamping groove will correspond to the clamping plate, and the second spring will return to its natural state and cause the clamping plate to slide and clamp into the clamping groove, so that the support plate and the connecting frame are locked and fixed together, so that the connecting frame can pull the support plate and the pipe on the support plate to rise in the subsequent process; 3. Before the connecting frame descends and contacts the pallet, the tip of the positioning plate will be inserted into the positioning groove. The cooperation between the positioning plate and the positioning groove enables the positioning plate to limit the descending trajectory of the connecting frame, so as to ensure that the connecting frame can be accurately locked and fixed with the pallet; 4. When the connecting frame rises to the specified height, the connecting frame will move to the lifting seat, and the baffle will press down the end of the pressing plate outside the accommodating cavity, so that the end of the pressing plate inside the accommodating cavity will tilt upward; that is, when the connecting frame rises to the specified height, the pressing plate will automatically detach from the pipe in the accommodating cavity, so that the workers can take the pipe on the pallet. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application; Figure 2 is a schematic cross-sectional structural diagram of a connecting frame and a supporting plate according to an embodiment of the present application; Figure 3 yes Figure 2 A local enlarged schematic diagram of the middle A; Figure 4 It is a schematic diagram of the exploded structure of the support plate and the base in the embodiment of the present application; Figure 5 It is a schematic cross-sectional structure diagram of a support plate and a base according to an embodiment of the present application; Figure 6 It is a schematic cross-sectional structure diagram of the entire embodiment of the present application.

[0014] 1. lifting seat; 11. motor; 12. roller; 13. lifting rope; 14. baffle; 2. connecting frame; 21. end plate; 22. connecting plate; 23. accommodating chamber; 24. slot; 25. positioning slot; 26. pressure plate; 261. torsion spring; 3. support plate; 31. slide slot; 32. column; 321. first spring; 322. slot; 33. connecting slot; 34. card plate; 341. pull rope; 342. guide wheel; 343. second spring; 344. first guide surface; 35. limiting slot; 36. positioning plate; 37. groove; 38. limiting assembly; 381. plug column; 382. third spring; 383. guide slot; 384. second guide surface; 39. penetration slot; 4. base; 41. roller; 42. hydraulic cylinder; 43. limiting column; 44. top column. DETAILED DESCRIPTION

[0015] The following is combined with Figure 1-6 This application is described in further detail.

[0016] The present application embodiment discloses a building material lifting device. Figure 1 As shown, the building material lifting device includes a lifting seat 1, a connecting frame 2, a supporting plate 3 and a base 4 which are arranged in sequence from top to bottom.

[0017] A plurality of rollers 41 are installed at the bottom of the base 4 to facilitate the movement and transportation of the base 4; hydraulic cylinders 42 are installed at the front and rear ends of the upper surface of the base 4, and the piston rods of the two hydraulic cylinders 42 extend in the vertical direction and are connected to the same lifting base 1, so that the lifting base 1 can be lifted and lowered stably.

[0018] like Figure 1 and Figure 6 As shown, a motor 11 is installed on the lower surface of the lifting seat 1, and the output shaft of the motor 11 extends in the horizontal direction and is coaxially connected to a roller 12. The roller 12 rotates around its own axis and is connected to the lifting seat 1, and the roller 12 is connected to the connecting frame 2 through a plurality of suspension ropes 13. In this embodiment, the number of suspension ropes 13 is four and they are respectively arranged at the four corners of the connecting frame 2. Therefore, when the motor 11 drives the roller 12 to rotate, the roller 12 can drive the connecting frame 2 to rise stably through the suspension ropes 13.

[0019] like Figure 2 and Figure 3 As shown, the support plate 3 is provided with a slide groove 31 penetrating the upper and lower sides of the support plate 3, and a column 32 is slidably embedded in the slide groove 31 along the vertical direction. The column 32 and the support plate 3 are connected to the same first spring 321, one end of the first spring 321 is fixedly connected to the support plate 3, and the other end of the first spring 321 is fixedly connected to the column 32. When the first spring 321 is in a natural state, the upper end of the column 32 will protrude upward from the upper surface of the support plate 3.

[0020] A horizontally arranged connecting groove 33 is provided on the groove walls on the left and right sides of the slide groove 31. The connecting groove 33 penetrates the side wall of the support plate 3. A clamping plate 34 is slidably embedded in the connecting groove 33. The clamping plate 34 is connected to the column 32 through a pull rope 341. A guide wheel 342 is rotatably connected to the groove wall of the connecting groove 33; one end of the pull rope 341 is fixedly connected to the clamping plate 34, and the other end of the pull rope 341 is fixedly connected to the column 32, and the middle part of the pull rope 341 passes around the guide wheel 342.

[0021] The clamping plate 34 and the support plate 3 are connected to the same second spring 343, one end of the second spring 343 is fixedly connected to the clamping plate 34, and the other end of the second spring 343 is fixedly connected to the groove wall of the connecting groove 33. When the first spring 321 is in a natural state, the column 32 will be tightened to the clamping plate 34 through the pull rope 341, the clamping plate 34 will sink into the connecting groove 33, and the second spring 343 will be in a deformed state.

[0022] When construction materials need to be transported and lifted, the pallet 3 will be placed on the upper surface of the base 4, and the connecting frame 2 will be located above the pallet 3 and separated from the pallet 3. At this time, the left and right sides of the pallet 3 are not blocked by the connecting frame 2 and the lifting rope 13, so that workers can place pipes from the left and right sides of the pallet 3 on the upper surface of the pallet 3 for quick loading of the pipes.

[0023] When the pipe is loaded onto the upper surface of the support plate 3, the pipe will press down the upper end of the column 32, and the column 32 will sink downward into the slide groove 31, so that the pull rope 341 is no longer tightened on the clamping plate 34, and the second spring 343 will return to its natural state and cause the clamping plate 34 to partially extend out of the connecting groove 33. At this time, the clamping plate 34 will be on the descending trajectory of the connecting frame 2.

[0024] like Figure 1 As shown, in this embodiment, the connecting frame 2 includes two end plates 21 arranged in an inverted "U" shape, and the lower ends of the two end plates 21 are connected by two connecting plates 22, so that the bottom of the connecting frame 2 is surrounded by a accommodating cavity 23, and the left and right side walls of the accommodating cavity 23 are provided with a card groove 24; the card plate 34 is provided with a first guide surface 344 inclined upward.

[0025] When the pipe loading is completed, the motor 11 will drive the winding roller 12 to rotate, and the winding roller 12 will unwind the sling rope 13, so that the connecting frame 2 will descend. During the descent, the connecting frame 2 will be pressed downward against the first guide surface 344, and the connecting frame 2 will cause the clamping plate 34 to sink into the connecting groove 33 through its own gravity. At this time, the support plate 3 will be embedded in the accommodating cavity 23; then the clamping groove 24 will correspond to the clamping plate 34, and the second spring 343 will return to its natural state and cause the clamping plate 34 to slide and clamp into the clamping groove 24, so that the support plate 3 and the connecting frame 2 are locked and fixed together, so that the connecting frame 2 can pull the support plate 3 and the pipe on the support plate 3 to rise in the subsequent process.

[0026] It is worth noting that when the support plate 3 and the connecting frame 2 are locked and fixed together, the pipes on the support plate 3 will be in the accommodating cavity 23, and the left and right sides of the connecting frame 2 will block the pipes to improve the stability of the pipes during transportation and lifting.

[0027] like Figure 4 and Figure 5As shown, a plurality of vertically arranged limiting posts 43 are installed on the upper surface of the base 4, and the upper ends of the limiting posts 43 are pointed. The support plate 3 is provided with a plurality of limiting grooves 35 for the limiting posts 43 to be inserted, and the limiting grooves 35 correspond to the limiting posts 43 one by one. When the support plate 3 is placed downward on the upper surface of the base 4, the tip of the limiting post 43 will first be embedded in the limiting groove 35. The cooperation between the limiting post 43 and the limiting groove 35 enables the limiting post 43 to limit the descending trajectory of the support plate 3, so as to ensure that the support plate 3 is accurately descended to the specified position on the upper surface of the base 4.

[0028] like Figure 1 As shown, positioning plates 36 are installed on both sides of the left and right sides of the pallet 3. When the pipes are placed on the upper surface of the pallet 3, the positioning plates 36 can block the pipes on the upper surface of the pallet 3 to prevent the pipes from sliding down from the left and right sides of the pallet 3; and the height of the positioning plates 36 is relatively low, so that the positioning plates 36 will not affect the placement of the pipes on the pallet 3.

[0029] The upper end of the positioning plate 36 is a pointed tip, and the left and right side walls of the accommodating cavity 23 are both provided with positioning grooves 25 for the positioning plate 36 to be inserted into, and the positioning grooves 25 correspond to the positioning plates 36 one by one. Before the connecting frame 2 descends and contacts the clamping plate 34, the tip of the positioning plate 36 will be inserted into the positioning groove 25, and the cooperation between the positioning plate 36 and the positioning groove 25 enables the positioning plate 36 to limit the descending trajectory of the connecting frame 2, so as to ensure that the connecting frame 2 can be accurately locked and fixed with the supporting plate 3.

[0030] like Figure 1 and Figure 2 As shown, two pressing plates 26 are rotatably connected to the connecting frame 2, and the two pressing plates 26 are respectively arranged on the left and right sides of the accommodating chamber 23. The pressing plates 26 and the connecting frame 2 are connected to the same torsion spring 261, one end of the torsion spring 261 is fixedly connected to the pressing plate 26, and the other end of the torsion spring 261 is fixedly connected to the connecting frame 2. When the connecting frame 2 and the supporting plate 3 are locked and fixed together, the pressing plate 26 will press the pipe in the accommodating chamber 23, and the torsion spring 261 will be in a natural state, thereby improving the stability of the pipe during transportation and lifting.

[0031] When the pipes are transported horizontally to the designated area, the hydraulic cylinder 42 will drive the lifting seat 1 to rise to the designated height, the motor 11 will drive the roller 12 to rotate, the roller 12 will rotate to reel in the sling 13, and the sling 13 will pull the connecting frame 2 and the pallet 3 up, so that the pipes on the pallet 3 can rise to the designated height.

[0032] It is worth noting that one end of the pressing plate 26 is located in the accommodating cavity 23, and the other end of the pressing plate 26 is located outside the accommodating cavity 23; two baffles 14 are installed on the lower surface of the lifting seat 1, and the baffles 14 correspond to the pressing plates 26 one by one. When the connecting frame 2 rises to the specified height, the connecting frame 2 will move to the lifting seat 1, and the baffle 14 will press down the end of the pressing plate 26 located outside the accommodating cavity 23, so that the end of the pressing plate 26 located in the accommodating cavity 23 will tilt upward; that is, when the connecting frame 2 rises to the specified height, the pressing plate 26 will automatically detach from the pipe in the accommodating cavity 23, so that the worker can take the pipe on the pallet 3.

[0033] like Figure 2 and Figure 3 As shown, horizontally arranged grooves 37 are provided on the left and right groove walls of the slide groove 31, and a limit assembly 38 is provided in the groove 37. The limit assembly 38 includes a plug post 381 slidably embedded in the groove 37, and the plug post 381 and the support plate 3 are commonly connected with the same third spring 382, ​​one end of the third spring 382 is fixedly connected to the plug post 381, and the other end of the third spring 382 is fixedly connected to the groove wall of the groove 37; a horizontally arranged slot 322 is provided on the column 32, and the slot 322 runs through the left and right sides of the column 32.

[0034] A guide groove 383 is provided at the bottom of the plug column 381, and a second guide surface 384 inclined downward is provided on the top groove wall of the guide groove 383; two through grooves 39 are provided on the lower surface of the support plate 3, and the through grooves 39 correspond to the grooves 37 one by one and are connected to each other; two vertically arranged top columns 44 are installed on the upper surface of the base 4, and the top columns 44 can be slidably inserted into the through grooves 39.

[0035] During the descent of the pallet 3, the third spring 382 will be in a natural state, and the plug post 381 will be inserted into the slot 322, so that the column 32 is locked and fixed in the slide groove 31; during the descent of the pallet 3 and the impact with the base 4, the top column 44 will be inserted into the penetration groove 39 and extend into the guide groove 383. At this time, the top column 44 will push the plug post 381 to move out of the slot 322 through the second guide surface 384, and the first spring 321 will return to its natural state and cause the upper end of the column 32 to protrude upward from the upper surface of the pallet 3. The column 32 will pull the card plate 34 to slide out of the card slot 24 through the pull rope 341; that is, when the pallet 3 is placed downward on the upper surface of the base 4, the connecting frame 2 will automatically separate from the pallet 3 so that the subsequent pipes can be quickly fed to the upper surface of the pallet 3.

[0036] The implementation principle of the building material lifting device of the embodiment of the present application is: during the lifting process of the pipe, the pallet 3 will be placed on the upper surface of the base 4, and the connecting frame 2 and the pallet 3 will be in a separated state. At this time, the worker can place the pipe on the upper surface of the pallet 3 from the left and right sides of the pallet 3 to facilitate the rapid loading of the pipe; and the positioning plate 36 will limit the pipe on the pallet 3 to prevent the pipe from sliding off from the left and right sides of the pallet 3.

[0037] When the pipe loading is completed, the motor 11 will drive the winding roller 12 to rotate, and the winding roller 12 will unwind the sling rope 13, so that the connecting frame 2 will descend; the positioning plate 36 will cooperate with the positioning groove 25, so that the connecting frame 2 will descend along the specified trajectory and press downward on the clamping plate 34, and the connecting frame 2 will push the clamping plate 34 to sink into the connecting groove 33 through the first guide surface 344, so that the support plate 3 can be embedded in the accommodating cavity 23; then the clamping groove 24 will descend to correspond to the clamping plate 34, the second spring 343 will return to its natural state and prompt the clamping plate 34 to be inserted into the clamping groove 24, so that the connecting frame 2 and the support plate 3 are locked and fixed together, and at the same time, the pressure plate 26 on the connecting frame 2 will press downward on the pipe on the support plate 3.

[0038] Afterwards, the worker will push the base 4 to move, so that the base 4 will transport the pipe horizontally to the designated area, and then the hydraulic cylinder 42 will drive the lifting seat 1 to rise to the designated height, the motor 11 will drive the roller 12 to rotate, the roller 12 will rotate to reel in the sling 13, the sling 13 will pull the connecting frame 2 and the support plate 3 to rise, so that the top column 44 will disengage from the guide groove 383, and at this time the third spring 382 will return to its natural state and prompt the plug column 381 to be plugged into the slot 322, so that the column 32 is locked and fixed in the slide groove 31.

[0039] When the pallet 3 drives the pipe to rise to the specified height, the pallet 3 will approach the lifting seat 1, and the baffle 14 on the lifting seat 1 will press down the end of the pressing plate 26 outside the accommodating chamber 23, so that the end of the pressing plate 26 inside the accommodating chamber 23 will be tilted upward and separated from the pipe in the accommodating chamber 23, so that the worker can take the pipe on the pallet 3.

[0040] When the pipe is taken, the hydraulic cylinder 42 will drive the lifting seat 1 to descend, the motor 11 will drive the reel 12 to rotate, and the reel 12 will unwind the sling rope 13, so that the connecting frame 2 and the support plate 3 will descend; then the tip of the limit column 43 will be inserted into the limit groove 35, so that the support plate 3 can accurately descend to the specified position on the upper surface of the base 4; then the top column 44 will be inserted into the penetration groove 39 and extend into the guide groove 383, at this time, the top column 44 will push the plug column 38 through the second guide surface 384. 1 moves out of the slot 322, the first spring 321 will return to the natural state and cause the upper end of the column 32 to protrude upward from the upper surface of the pallet 3, the column 32 will pull the card plate 34 to slide out of the card slot 24 through the pull rope 341, so that the connecting frame 2 is separated from the pallet 3; finally, the motor 11 will drive the roller 12 to rotate, the roller 12 will rotate to reel in the hanging rope 13, and the hanging rope 13 will pull the connecting frame 2 to rise away from the pallet 3, so that the subsequent pipes can be quickly fed to the upper surface of the pallet 3.

[0041] To sum up, workers can place pipes from the left and right sides of the pallet 3 on the upper surface of the pallet 3, thereby realizing rapid loading of pipes; the present application can realize lifting of pipes, compaction of pipes, rapid retrieval of pipes, locking and fixing of the connecting frame 2 and the pallet 3, and separation of the connecting frame 2 and the pallet 3 by controlling the hydraulic cylinder 42 and the motor 11, thereby improving the lifting and transportation efficiency of pipes.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A building material lifting device, characterized in that: It comprises a lifting seat (1), a connecting frame (2), a supporting plate (3) and a base (4) which are arranged in sequence from top to bottom; A plurality of rollers (41) and a hydraulic cylinder (42) are provided on the base (4), and a piston rod of the hydraulic cylinder (42) extends in a vertical direction and is connected to the lifting seat (1); A motor (11) is provided on the lifting seat (1), a winding roller (12) is coaxially connected to the output shaft of the motor (11), the winding roller (12) is connected to the lifting seat (1) by rotating around its own axis, and the winding roller (12) is connected to the connecting frame (2) via a plurality of suspension ropes (13); The bottom of the connecting frame (2) is provided with a receiving cavity (23) for embedding the supporting plate (3) and the pipe, and the left and right side walls of the receiving cavity (23) are both provided with a clamping groove (24); A column (32) is slidably connected to the support plate (3) in the vertical direction, and the column (32) and the support plate (3) are connected to a first spring (321); when the first spring (321) is in a natural state, the upper end of the column (32) protrudes upward from the upper surface of the support plate (3) and is used to press the pipe on the support plate (3) downward; The column (32) is connected to the clamping plate (34) via a pull rope (341); a first guide wheel (342) is provided on the support plate (3) for the pull rope (341) to pass around; the clamping plate (34) is connected to the support plate (3) by sliding in the horizontal direction; the clamping plate (34) and the support plate (3) are connected to the same second spring (343); when the column (32) is pressed down by the pipe on the support plate (3), the second spring (343) will return to a natural state and cause the clamping plate (34) to move to just below the connecting frame (2); The card plate (34) is provided with a first guide surface (344) inclined upward, and the connecting frame (2) can push the card plate (34) into the accommodating cavity (23) through the first guide surface (344) during the descending process, and make the card slot (24) correspond to the card plate (34), at which time the second spring (343) will return to a natural state and cause the card plate (34) to slide and be connected to the card slot (24); A limiting assembly (38) is provided on the support plate (3) for limiting and fixing the upright column (32) after the pipe is pressed downward.

2. The building material lifting device according to claim 1, characterized in that: The limiting assembly (38) comprises a plug post (381) slidably connected to the support plate (3) in a horizontal direction, the plug post (381) and the support plate (3) are connected to a third spring (382), and a slot (322) is provided on the side of the column (32); when the third spring (382) is in a natural state, the plug post (381) can be plugged into the slot (322) of the column (32) pressed down by the pipe; A guide groove (383) is provided at the bottom of the plug post (381), a second guide surface (384) inclined downward is provided on the top groove wall of the guide groove (383), and a top post (44) is provided on the base (4); when the support plate (3) descends and contacts the base (4), the top post (44) will be inserted into the guide groove (383) and push the plug post (381) to move out of the slot (322) through the second guide surface (384).

3. The building material lifting device according to claim 2, characterized in that: The base (4) is provided with a plurality of vertically arranged limit columns (43), the upper ends of the limit columns (43) are pointed, and the support plate (3) is provided with a plurality of limit grooves (35) for the limit columns (43) to be inserted, and the limit grooves (35) correspond to the limit columns (43) one by one.

4. The building material lifting device according to claim 3, characterized in that: Positioning plates (36) are provided on both the left and right sides of the support plate (3).

5. The building material lifting device according to claim 4, characterized in that: The left and right side walls of the accommodating cavity (23) are both provided with positioning grooves (25) for the positioning plates (36) to be inserted into, the positioning grooves (25) correspond to the positioning plates (36) one by one, and the upper end of the positioning plates (36) is a pointed end.

6. The building material lifting device according to claim 5, characterized in that: The connecting frame (2) is rotatably connected to two pressing plates (26), which are arranged on the left and right sides of the accommodating chamber (23). The pressing plates (26) and the connecting frame (2) are connected to a common torsion spring (261), which is used to force the pressing plates (26) to press against the pipe in the accommodating chamber (23).

7. The building material lifting device according to claim 6, characterized in that: One end of the pressing plate (26) is located inside the accommodating cavity (23), and the other end of the pressing plate (26) is located outside the accommodating cavity (23); Two baffles (14) are provided on the lifting seat (1). When the connecting frame (2) rises to the lifting seat (1), the baffles (14) press down one end of the pressing plate (26) located outside the accommodating cavity (23), so that one end of the pressing plate (26) located inside the accommodating cavity (23) tilts upward.

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