Building construction elevator

Abstract

The invention discloses a building construction elevator, and relates to the technical field of elevators. The device comprises a base, a guide rail frame is arranged on the base, a lifting cage is arranged on the guide rail frame in a sliding mode through a lifting piece, the lifting cage comprises a U-shaped base, safety doors are arranged at the two ends of a lateral opening of the U-shaped base in a sliding mode, a groove is formed in one side of the bottom of the U-shaped base, and an extension plate is arranged in the groove in a sliding and inserted mode; the safety doors and the extension plate are arranged on the U-shaped seat in a sliding mode, one safety door is in linkage with the extension plate through the linkage mechanism, when the safety doors slide, the extension plate can be driven to slide and extend, when the safety doors are opened, the extension plate slides to be in lap joint with a floor, and when the safety doors are closed, the extension plate slides and contracts into the groove, so that the safety doors are closed. No matter whether a floor has an accommodating space or not, the extension plates can be adjusted through the connecting pieces, so that the extension plates can adapt to different construction environments, and the practicability is improved.

Description

Technical Field

[0001] The present application relates to the technical field of elevators, and in particular to a construction elevator. Background Art

[0002] A construction elevator is a passenger and freight elevator that can transport various building materials and construction personnel in layers. Because the guide rails of the construction elevator are attached to the outside of the building structure, it is also called an external elevator. When existing elevators are erected, they are usually set at a certain distance from the wall, so that the cage will not come into contact with the wall during the lifting process. This means that there is a certain distance between the lifting cage and the floor. In order to avoid the risk of construction workers tripping and stepping on air when walking out of the lifting cage, and to facilitate the transfer of materials or workpieces in the cage to the floor, a plank is also provided, which is set between the cage and the floor. This type of plank has certain shortcomings. When the floor has a placement space, the plank is set between the cage and the floor. Although it can provide a walking passage, it is unstable and the pedal is easily displaced when stepped on or by the movement of a trolley carrying materials, making the pedal easy to fall. When the floor does not have a placement space, the end face of the pedal can only be pressed against the wall, which results in the pedal being unable to effectively bear the load, so that the pedal cannot be effectively and stably used in different buildings and different construction environments, thereby reducing its practicality. Therefore, the present application proposes a construction elevator. Summary of the invention

[0003] The purpose of this application is to solve the problems in the above-mentioned background technology, and this application provides a construction elevator.

[0004] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: A construction hoist, comprising: A base, on which a guide rail frame is arranged, on which a cage is slidably arranged through a lifting member, the cage comprises a U-shaped seat, both ends of the lateral opening of the U-shaped seat are slidably arranged with safety doors, a groove is opened on one side of the bottom of the U-shaped seat, and an extension plate is slidably inserted in the groove; The linkage mechanism includes a first guide rod rotatably arranged on a U-shaped seat, a first gear being fixedly provided on the first guide rod, a first rack being fixedly provided on one of the safety doors and meshing with the teeth of the first gear, a second guide rod coaxial with the first guide rod being rotatably penetrated through the opposite side of the inner wall of the groove, a second gear being fixedly provided on the second guide rod, a second rack being fixedly provided on the extension plate and meshing with the teeth of the second gear, a connecting piece being connected between the first guide rod and the second guide rod, which is used to connect or disconnect the first guide rod and the second guide rod.

[0005] Furthermore, the connecting member includes a disk body arranged at the top end of the second guide rod, a slot is opened on the disk body, a sleeve is arranged at the bottom end of the first guide rod, a sleeve rod is slidably inserted in the sleeve, and an insert block is constructed on the sleeve rod to be plugged into and matched with the slot.

[0006] Furthermore, a first spring is connected between the sleeve rod and the inner wall of the sleeve, the number of slots and plug-in blocks are both several and distributed in a ring array, and the longitudinal sections of the slots and plug-in blocks are both V-shaped.

[0007] Furthermore, the extension plate includes a first plate body, one end of which is provided with a through slot, a second plate body is hinged in the through slot, opposite sides of the inner wall of the through slot are provided with plug-in slots, and two plug-in blocks are slidably provided on the second plate body, and the two plug-in blocks are respectively plugged into and matched with the two plug-in slots.

[0008] Furthermore, two through slots are formed through the first plate body, and two elastic bands are connected to the first plate body. The free ends of the two elastic bands are respectively movable through the two through slots and connected to the second plate body.

[0009] Furthermore, one end of the first plate body away from the U-shaped seat is hinged to two supporting rods, one end of the U-shaped seat is hinged to two cylinders, and the two supporting rods slide through the two cylinders respectively.

[0010] Furthermore, the cylinder is connected to a casing, a screw rod is threadedly penetrated on the casing, and a pressure block is rotatably connected to the end of the screw rod.

[0011] Furthermore, a plurality of insertion holes are arranged in an array on the inner bottom wall of the U-shaped seat, and a support plate is constructed on the safety door, and a plug rod with an end portion plugged and matched with the insertion hole is movably penetrated through the support plate.

[0012] Furthermore, an embedding groove is provided on the base, the U-shaped seat is inserted and matched with the embedding groove, and buffer parts are provided at the four corners of the bottom of the U-shaped seat.

[0013] Furthermore, the buffer comprises an outer cylinder arranged at the bottom of the U-shaped seat, an inner rod is movably inserted in the outer cylinder, a second spring is connected between the inner rod and the inner wall of the outer cylinder, and a damper is connected between the outer cylinder and the inner rod.

[0014] The beneficial effects of this application are as follows: In the present application, a safety door and an extension plate are slidably arranged on a U-shaped seat, wherein a safety door and an extension plate are linked by a linkage mechanism. When the safety door is slid, the extension plate can be driven to slide and extend. When the safety door is opened, the extension plate slides and overlaps with the floor. When the safety door is closed, the extension plate slides and retracts into the groove. Regardless of whether the floor has space for insertion, the extension plate can be adjusted through the connecting parts to adapt to different construction environments, thereby improving practicality.

[0015] In the present application, a support rod is hinged on the extension plate, and the support rod slides with the cylinder hinged on the U-shaped seat. When the extension plate slides, the support rod slides along the cylinder, and then the screw is twisted to rotate and move, so that the pressure block squeezes and fixes the support rod. Not only can the extension plate be fixed, further improving its stability, but also, after the support rod is fixed, it can also play a pulling role on the extension plate, which is used to improve the load-bearing performance of the end of the extension plate, so that the load-bearing performance of the end of the extension plate is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural diagram of this application; Figure 2 This is a three-dimensional structural diagram of the cage of this application; Figure 3 This is another perspective three-dimensional structural diagram of the cage of the present application; Figure 4 It is a three-dimensional structural diagram of part of this application; Figure 5 This is an exploded view of the three-dimensional structure of the extension plate of this application; Figure 6 It is an exploded view of some three-dimensional structures of this application; Figure 7 It is a three-dimensional structural diagram of the connector of this application; Figure 8 This is an exploded view of the three-dimensional structure of the connector of this application; Fig. 9 It is a three-dimensional structural diagram of the buffer component of the present application; Fig.10 This is a sectional view of the three-dimensional structure of the buffer component of the present application; Figure numerals: 1, base; 2, guide rail frame; 3, cage; 4, linkage mechanism; 5, first spring; 6, through groove; 7, elastic band; 8, support rod; 9, cylinder; 10, casing; 11, screw rod; 12, pressure block; 13, plug hole; 14, support plate; 15, plug rod; 16, embedded groove; 17, buffer; 301, U-shaped seat; 302, safety door; 303, groove; 304, extension plate; 3041, first plate body; 3042, through groove; 3043, The second plate body; 3044, the plug-in slot; 3045, the plug-in block; 401, the first guide rod; 402, the first gear; 403, the first rack; 404, the second guide rod; 405, the second gear; 406, the second rack; 407, the connecting piece; 4071, the disk body; 4072, the slot; 4073, the sleeve; 4074, the sleeve rod; 4075, the plug-in block; 1701, the outer cylinder; 1702, the inner rod; 1703, the second spring; 1704, the damper. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0018] like Figure 1-Figure 10 As shown, a construction hoist proposed in one embodiment of the present application includes: A base 1 is provided with a guide rail frame 2, on which a cage 3 is slidably provided via a lifting member. Preferably, the base 1 can be a concrete seat cast in concrete, and the guide rail frame 2 can be a frame spliced ​​with a steel structure. The guide rail frame 2 can be increased in height according to the height of the building (the lifting member includes a motor, a steel wire rope, a pulley and other components, which are existing well-known technologies). The cage 3 includes a U-shaped seat 301, and safety doors 302 are slidably provided at both ends of the lateral opening of the U-shaped seat 301. A groove 303 is provided on one side of the bottom of the U-shaped seat 301, and an extension plate 304 is slidably inserted in the groove 303. Preferably, as Figure 2As shown, the top of the U-shaped seat 301 is open, and two safety doors 302 are respectively located on the left and right sides of the U-shaped seat 301. A slide groove is opened on one side of the U-shaped seat 301, and the safety door 302 slides through the slide groove. In actual use, the groove 303 is located on the side facing the wall, and the safety door 302 slides open horizontally. One of the safety doors 302 is opened to facilitate construction workers or materials to enter the cage 3. When the cage 3 is lifted to a certain floor under the action of the lifting member, the other safety door 302 is opened, and the extension plate 304 is extended out of the groove 303, so that the extension plate 304 is partially placed in the floor (when the floor has space for placement) or overlapped with the outside of the wall (the floor does not have space for placement). At this time, most of the extension plate 304 is still located in the groove 303, so that the extension plate 304 extending to the outer wall has load-bearing capacity, and the construction workers can step on the extension plate 304 to enter the floor; The linkage mechanism 4 includes a first guide rod 401 rotatably arranged on the U-shaped seat 301, a first gear 402 is fixedly arranged on the first guide rod 401, a first rack 403 meshing with the teeth of the first gear 402 is fixedly arranged on one of the safety doors 302, when the safety door 302 is slid, the first rack 403 meshes with the teeth of the first gear 402, thereby driving the first guide rod 401 to rotate, and a second guide rod 404 coaxial with the first guide rod 401 is rotated and penetrated on the opposite side of the inner wall of the groove 303, a second gear 405 is fixedly arranged on the second guide rod 404, and a second rack 406 meshing with the teeth of the second gear 405 is fixedly arranged on the extension plate 304, when the second guide rod 404 is rotated, the second gear 405 is fixedly arranged on the second guide rod 404, and the second rack 406 meshing with the teeth of the second gear 405 is fixedly arranged on the extension plate 304. When the rod 404 rotates, the teeth of the second gear 405 and the second rack 406 are meshed, which can drive the extension plate 304 to slide. A connecting piece 407 is connected between the first guide rod 401 and the second guide rod 404, which is used to connect or disconnect the first guide rod 401 and the second guide rod 404. By setting the connecting piece 407 between the first guide rod 401 and the second guide rod 404, when the connecting piece 407 is in a connected state, the first guide rod 401 and the second guide rod 404 are in a connected and fixed state. When one of the safety doors 302 is slid, the extension plate 304 will be driven to slide synchronously, that is, when the safety door 302 is in a closed state, the extension plate 304 slides. When the safety door 302 is opened, the extension plate 304 will slide out of the groove 303 synchronously. When the floor has space for insertion, as the safety door 302 is fully opened, the extension plate 304 will slide so that one end of the extension plate 304 is overlapped inside the floor and the other end is inserted into the groove 303, so that both ends of the extension plate 304 have support points, making it easy for construction workers to enter the floor through the extension plate 304. When the floor does not have space for insertion, the end face of the extension plate 304 can only overlap the outer wall. At this time, the sliding distance of the extension plate 304 will be limited. When the safety door 302 is slid and the extension plate 304 is extended, the extension plate 304 will slide out of the groove 303 synchronously. When the safety door 302 is fully opened, the extension plate 304 will slide so that one end of the extension plate 304 is overlapped inside the floor and the other end is inserted into the groove 303. After the end surface of the plate 304 overlaps with the wall, the extension plate 304 cannot slide further. At this time, the connection and fixation of the connecting piece 407 to the first guide rod 401 and the second guide rod 404 can be released, and the safety door 302 can be pushed to slide alone, so that the safety door 302 can be fully opened. In order to make the device more reasonable, preferably, the length of the extension plate 304 is longer than the length of the safety door 302, so that no matter whether there is a space for insertion on the floor, when the safety door 302 is fully opened, a part of the extension plate 304 is still located in the groove 303, and it cannot be completely separated from the groove 303, so that the extension plate 304 has load-bearing performance, which is convenient for construction personnel to pass or transport materials; In the present solution, a safety door 302 and an extension plate 304 are slidably arranged on a U-shaped seat 301, wherein a safety door 302 and an extension plate 304 are linked via a linkage mechanism 4, and when the safety door 302 is slid, the extension plate 304 can be driven to slide and extend, and when the floor has an insertion space, the safety door 302 can be fully opened, and the extension plate 304 can be overlapped between the floor and the U-shaped seat 301; when the floor does not have an insertion space, the connector 407 can be disconnected so that the extension plate 304 does not need to slide the distance relative to the safety door 302 (i.e., the end face of the extension plate 304 overlaps the outer wall, and the safety door 302 can be fully opened), so that the extension plate 304 can adapt to different construction environments and ensure stability.

[0019] like Figure 7 and Figure 8 As shown, in some embodiments, the connecting member 407 includes a disk body 4071 arranged at the top of the second guide rod 404, and a slot 4072 is opened on the disk body 4071. A sleeve 4073 is arranged at the bottom end of the first guide rod 401. A sleeve rod 4074 is slidably inserted in the sleeve 4073. Preferably, a limit strip is constructed on the sleeve rod 4074, so that the sleeve rod 4074 can only slide vertically along the sleeve 4073, but cannot rotate in a circle. The sleeve rod 4074 is constructed with an insert block 4075 that is plugged and matched with the slot 4072. In the initial state, under the action of gravity, Use the lower sleeve rod 4074 to slide vertically along the sleeve 4073 so that the insert block 4075 thereon can be movably inserted into the slot 4072. At this time, the first guide rod 401 and the second guide rod 404 are in a connected state. When the first guide rod 401 rotates, it can drive the second guide rod 404 to rotate synchronously. When the connection needs to be released, slide the sleeve rod 4074 upward to make the insert block 4075 disengage from the slot 4072, thereby releasing the connection between the first guide rod 401 and the second guide rod 404, so that the rotation of the two does not affect each other, and the method of connecting or releasing the connection is relatively simple and convenient.

[0020] like Figure 7 and Figure 8As shown, in some embodiments, a first spring 5 is connected between the sleeve rod 4074 and the inner wall of the sleeve 4073, the number of slots 4072 and the number of plug blocks 4075 are both multiple and distributed in a ring array, the longitudinal sections of the slots 4072 and the plug blocks 4075 are both constructed in a V shape, and the longitudinal sections of the slots 4072 and the plug blocks 4075 are both constructed in a V shape, so that the inclined surfaces of the two overlap and cooperate, when the sliding of the extension plate 304 is not restricted (that is, the floor has an insertion space, and the extension plate 304 is not resisted by the wall and the outer wall), under the elastic force of the first spring 5, the first guide rod 401 can drive the second guide rod 404 to rotate synchronously, that is, the safety door 302 and the extension plate 304 are in a V shape. The extension panels 304 slide synchronously and have the same sliding distance. When the extension panel 304 is restricted in sliding (i.e., there is no insertion space on the floor, the extension panel 304 conflicts with the outer wall of the wall, and is limited by the wall so that the extension panel 304 cannot continue to slide), at this time, the safety door 302 continues to slide to drive the first guide rod 401 to rotate. Although the second guide rod 404 cannot rotate at this time, the slot 4072 and the plug block 4075 are mainly overlapped by the inclined surface. Under the action of the inclined surface, when the first guide rod 401 continues to rotate, the sleeve rod 4074 automatically slides upward due to the stress of rotation, so that the plug block 4075 is disengaged from the slot 4072, thereby automatically releasing the connection, thereby improving practicality.

[0021] like Figure 5 As shown, in some embodiments, the extension plate 304 includes a first plate body 3041, one end of the first plate body 3041 is penetrated by a through slot 3042, a second plate body 3043 is hinged in the through slot 3042, opposite sides of the inner wall of the through slot 3042 are penetrated by plug-in slots 3044, two plug-in blocks 3045 are slidably provided on the second plate body 3043, and the two plug-in blocks 3045 are respectively plugged into the two plug-in slots 3044. Preferably, the second plate body 3043 is provided with a receiving slot, the longitudinal section of the receiving slot is L-shaped, the plug-in block 3045 is constructed as an L-shaped block and is slidably inserted in the receiving slot, when the plug-in block 3045 is inserted in the plug-in slot 3044, the second plate body 3043 and the first plate body 3041 are fixed. The second plate body 3043 is fixed to form an extension plate 304. When the floor does not have space for placement, there is no need to release the fixation of the second plate body 3043. When the floor has space for placement, the fixation of the second plate body 3043 can be released. At this time, the second plate body 3043 will rotate around the hinge point. During the lifting process of the cage 3 as a whole, there will be a height deviation in its docking position. The extension plate 304 can be placed on a floor that is definitely higher than the floor. When it is excessively higher than the floor, the end of the extension plate 304 is in a suspended state. By hingedly connecting the second plate body 3043, even if the docking height is slightly too high, the second plate body 3043 can still be overlapped in the floor after rotating around the hinge point, so that when a bucket truck or a cart is used to transport materials, the materials can be transferred to the floor more conveniently.

[0022] like Figure 5As shown, in some embodiments, two through slots 6 are formed through the first plate 3041, and two elastic bands 7 are connected to the first plate 3041. The elastic band 7 is made of elastic rubber bands, and the free ends of the two elastic bands 7 are respectively movably passed through the two through slots 6 and connected to the second plate 3043. By connecting the elastic band 7 between the first plate 3041 and the second plate 3043, even after the fixation of the first plate 3041 and the second plate 3043 is released, the second plate 3043 always remains in a horizontal state with the first plate 3041, and is pressed down during transportation of logistics. After the material is transported, the second plate 3043 is automatically reset under the action of the elastic band 7, so that when the material transportation is completed, before the extension plate 304 is stored, it is more convenient to plug the plug-in block 3045 into the plug-in slot 3044 to fix the second plate 3043, thereby improving convenience.

[0023] like Figure 2 and Figure 6 As shown, in some embodiments, one end of the first plate body 3041 away from the U-shaped seat 301 is hinged to two support rods 8, and one end of the U-shaped seat 301 is hinged to two cylinders 9. The two support rods 8 slide through the two cylinders 9 respectively. Preferably, a hinge seat is provided on the U-shaped seat 301, and a hinge shaft is provided on the cylinder 9. The hinge shaft is rotatably connected to the hinge seat. When the extension plate 304 slides and extends, the cylinder 9 rotates around the hinge point, and the support rod 8 slides along the cylinder 9. As the extension plate 304 slides, the support rod 8 will form an inclined state, such as Figure 2 As shown, when the extension plate 304 slides a certain distance, the two support rods 8 are inclined and are respectively located on both sides of the extension plate 304, which can be used as a temporary guardrail to play a protective role, thereby improving safety performance.

[0024] like Figure 6As shown, in some embodiments, the cylinder 9 is connected to a casing 10, a screw rod 11 is threaded through the casing 10, and a pressure block 12 is rotatably connected to the end of the screw rod 11. When the extension plate 304 slides and extends, the screw rod 11 is twisted and rotated, so that the pressure block 12 squeezes and contacts the support rod 8, and the friction force is used to fix the support rod 8, thereby fixing the extension plate 304. Preferably, the outer surface of the support rod 8 is provided with a card slot array along its length direction, and the pressure block 12 is provided with a card block that matches the card slot. Through the cooperation of the card slot and the card block, The support rod 8 can be fixed more firmly. By fixing the support rod 8, the extension plate 304 is fixed, so that when walking or transporting materials on the extension plate 304, the extension plate 304 will not loosen or move, thereby further improving the stability and safety performance. At the same time, after the support rod 8 is fixed, it can also play a pulling role on the extension plate 304, which is used to improve the load-bearing performance of the end of the extension plate 304. When the floor does not have a placement space and the end face of the extension plate 304 overlaps the outer wall, the support rod 8 is used to pull the end of the extension plate 304 to have better load-bearing performance, thereby improving practicality.

[0025] like Figure 3 As shown, in some embodiments, a plurality of insertion holes 13 are provided in an array on the inner bottom wall of the U-shaped seat 301, and a support plate 14 is constructed on the safety door 302. A plug rod 15 whose end is plugged into and engaged with the insertion hole 13 is movably penetrated through the support plate 14. By providing the insertion hole 13 on the U-shaped seat 301 and slidingly setting the plug rod 15 on the safety door 302, when the safety door 302 slides closed, the plug rod 15 is inserted into the corresponding insertion hole 13, so that the safety door 302 can be fixed, thereby preventing the safety door 302 from sliding open due to human body leaning on it or being hit by materials, thereby improving the safety performance.

[0026] like Figure 1 and Figure 2 As shown, in some embodiments, a groove 16 is provided on the base 1, and the U-shaped seat 301 is inserted into and matched with the groove 16. Buffer members 17 are provided at the four corners of the bottom of the U-shaped seat 301. When transporting certain materials, they are usually transported by bucket trucks or trolleys. By providing the groove 16 on the base 1, when the cage 3 descends to the bottom, the U-shaped seat 301 is just embedded in the groove 16. At this time, the inner bottom wall of the U-shaped seat 301 is just flush with the top surface of the base 1, so as to facilitate pushing the bucket truck and trolley into the U-shaped seat 301, thereby improving practicality. By providing the buffer member 17 on the bottom wall of the U-shaped seat 301, when the cage 3 descends to the bottom, the stress generated by the descent can be buffered, thereby preventing the cage 3 from hard hitting the base 1, thereby protecting the cage 3 or the base 1, thereby improving its service life, and at the same time, it can also improve the riding comfort of construction personnel.

[0027] like Fig. 9 and Fig.10As shown, in some embodiments, the buffer member 17 includes an outer cylinder 1701 arranged at the bottom of the U-shaped seat 301, and an inner rod 1702 is movably inserted in the outer cylinder 1701. A second spring 1703 is connected between the inner rod 1702 and the inner wall of the outer cylinder 1701, and a damper 1704 is connected between the outer cylinder 1701 and the inner rod 1702. When the cage 3 descends to the bottom, the inner rod 1702 first contacts the base 1, and under the action of the resistance force, the inner rod 1702 is driven to move upward and squeeze the second spring 1703. The elastic force of the second spring 1703 is used in conjunction with the damper 1704 for buffering and shock absorption, thereby avoiding a hard collision of the cage 3, thereby playing a role of buffering protection.

[0028] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A construction hoist, characterized in that: include: A base (1) is provided with a guide rail frame (2), a cage (3) is slidably provided on the guide rail frame (2) via a lifting member, the cage (3) comprises a U-shaped seat (301), safety doors (302) are slidably provided at both ends of a lateral opening of the U-shaped seat (301), a groove (303) is provided on one side of the bottom of the U-shaped seat (301), and an extension plate (304) is slidably inserted into the groove (303); The linkage mechanism (4) comprises a first guide rod (401) rotatably arranged on a U-shaped seat (301), a first gear (402) being fixedly provided on the first guide rod (401), a first rack (403) being fixedly provided on one of the safety doors (302) and meshing with the teeth of the first gear (402), a second guide rod (404) coaxial with the first guide rod (401) being rotatably penetrated through the inner wall opposite to the groove (303), a second gear (405) being fixedly provided on the second guide rod (404), a second rack (406) being fixedly provided on the extension plate (304) and meshing with the teeth of the second gear (405), and a connecting piece (407) being connected between the first guide rod (401) and the second guide rod (404) and being used to connect or disconnect the first guide rod (401) and the second guide rod (404).

2. The construction hoist according to claim 1, characterized in that: The connecting member (407) comprises a disk body (4071) arranged at the top end of the second guide rod (404), a slot (4072) being provided on the disk body (4071), a sleeve (4073) being provided at the bottom end of the first guide rod (401), a sleeve rod (4074) being slidably inserted in the sleeve (4073), and an insert block (4075) being configured on the sleeve rod (4074) for plugging and cooperating with the slot (4072).

3. The construction hoist according to claim 2, characterized in that: A first spring (5) is connected between the sleeve rod (4074) and the inner wall of the sleeve (4073); the number of the slots (4072) and the insert blocks (4075) are both multiple and distributed in a ring array; the longitudinal sections of the slots (4072) and the insert blocks (4075) are both V-shaped.

4. The construction hoist according to claim 1, characterized in that: The extension plate (304) comprises a first plate body (3041), one end of the first plate body (3041) is penetrated by a through slot (3042), a second plate body (3043) is hinged in the through slot (3042), opposite sides of the inner wall of the through slot (3042) are penetrated by plugging slots (3044), and two plugging blocks (3045) are slidably arranged on the second plate body (3043), and the two plugging blocks (3045) are respectively plugged into and matched with the two plugging slots (3044).

5. The construction hoist according to claim 4, characterized in that: The first plate body (3041) is provided with two through slots (6), the first plate body (3041) is connected to two elastic bands (7), and the free ends of the two elastic bands (7) are respectively movably passed through the two through slots (6) and connected to the second plate body (3043).

6. The construction hoist according to claim 4, characterized in that: One end of the first plate body (3041) away from the U-shaped seat (301) is hingedly connected to two support rods (8), and one end of the U-shaped seat (301) is hingedly connected to two cylinders (9), and the two support rods (8) slide through the two cylinders (9) respectively.

7. The construction hoist according to claim 6, characterized in that: The cylinder (9) is connected to a casing (10), a screw rod (11) is threadedly passed through the casing (10), and a pressure block (12) is rotatably connected to the end of the screw rod (11).

8. The construction hoist according to claim 1, characterized in that: The inner bottom wall of the U-shaped seat (301) is provided with a plurality of insertion holes (13) in an array, and the safety door (302) is provided with a support plate (14), and a plug rod (15) with an end portion plugged into and mating with the insertion hole (13) is movably penetrated through the support plate (14).

9. The construction hoist according to claim 1, characterized in that: The base (1) is provided with an embedding groove (16), the U-shaped seat (301) is inserted and matched with the embedding groove (16), and the four corners of the bottom of the U-shaped seat (301) are provided with buffer parts (17).

10. The construction hoist according to claim 9, characterized in that: The buffer member (17) comprises an outer cylinder (1701) arranged at the bottom of the U-shaped seat (301), an inner rod (1702) being movably inserted into the outer cylinder (1701), a second spring (1703) being connected between the inner rod (1702) and the inner wall of the outer cylinder (1701), and a damper (1704) being connected between the outer cylinder (1701) and the inner rod (1702).

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