Floor-lift

Abstract

The application provides a floor lifting machine, which comprises a chain lifting mechanism and a supporting conveying platform. The chain lifting mechanism comprises a fixed frame, guide rails and a chain transmission assembly. Two fixed frames are arranged at intervals. Two parallel guide rails are fixed on each side of each fixed frame. The chain transmission assembly is installed on the fixed frame and is in transmission connection with the supporting conveying platform. The supporting conveying platform comprises two sets of side roller mechanisms connected to the chain transmission assembly and a middle roller mechanism connected between the two sets of side roller mechanisms. The side roller mechanism comprises a bottom frame, rollers, a side frame and guide wheels. A plurality of rollers are rotatably installed on the bottom frame and are arranged at intervals along the long side direction of the bottom frame. The side frame is vertically fixed on one side of the bottom frame. Four guide wheels matched with the two guide rails are installed on the side frame. The floor lifting machine has simple structure design, improves the rigidity of the main structure for carrying heavy objects, enhances the carrying capacity and improves the lifting stability.

Description

Technical Field

[0001] This invention relates to the field of lifting and conveying technology, and specifically to a ground-mounted lifting machine. Background Technology

[0002] Currently, existing floor-mounted lifting machines integrate the roller conveyor panels as a single unit, with a four-chain lifting mechanism driving the entire roller conveyor panel up and down. Due to the need to accommodate the fork positions for picking up goods, the unused portion of the roller conveyor panel tends to sag under load, resulting in poor rigidity and weak load-bearing capacity. Even a 600kg load can easily deform the roller conveyor panel. Furthermore, during installation, the guide wheels must be secured to the equipment frame, placing high demands on installation. Summary of the Invention

[0003] In view of the above, the present invention provides a ground-mounted lifting machine, which has the advantages of simple and compact structure, strong load-bearing capacity, high structural rigidity, and strong lifting stability.

[0004] The technical solution of the present invention:

[0005] This invention provides a floor-mounted lifting machine, including a chain lifting mechanism and a load-carrying conveying platform. The chain lifting mechanism includes a fixed frame, guide rails, and a chain drive assembly. Two fixed frames are fixedly arranged at intervals, and two parallel guide rails are fixed on both sides of each fixed frame. The chain drive assembly is installed on the fixed frame and is connected to the load-carrying conveying platform to drive the load-carrying conveying platform to move up and down along the two guide rails. The load-carrying conveying platform includes two sets of side roller mechanisms respectively connected to the chain drive assembly and an intermediate roller mechanism connected between the two sets of side roller mechanisms. The side roller mechanism includes a base frame, rollers, side frames, and guide wheels. Multiple rollers are rotatably installed on the base frame and are arranged at intervals along the long side of the base frame. The side frame is vertically fixed to one side of the base frame, and four guide wheels that cooperate with the two guide rails are installed on the side frame. Two upper and lower guide wheels are correspondingly slidably arranged on each guide rail. The chain drive assembly is connected to the side frame, and the intermediate roller mechanism presses the four guide wheels on each side radially against the corresponding guide rail.

[0006] Furthermore, the intermediate roller mechanism includes a channel steel, intermediate rollers, connecting rods, and connecting plates. Multiple intermediate rollers are rotatably mounted on the channel steel. Connecting rods are connected to both sides of the channel steel. A connecting plate is fixed to one end of the connecting rod away from the channel steel. The connecting plate and the bottom frame can float up and down to balance the lifting error on both sides.

[0007] Furthermore, the connecting plate is connected to the bottom frame in a floating manner via a pin; or, the connecting plate is connected to the bottom frame in a floating manner via a spherical bearing.

[0008] Furthermore, the side idler roller mechanism also includes a conveyor motor, a conveyor sprocket, and a conveyor chain. The conveyor motor is mounted on the base frame, and a conveyor sprocket is mounted on a pin at one end of each idler roller. Any two adjacent conveyor sprockets are connected by a conveyor chain. The conveyor motor is used to drive the conveyor sprocket to rotate.

[0009] Furthermore, the bottom frame includes square tubes, angle steel, and end plates. The square tubes and angle steel are arranged in parallel, and end plates are fixedly connected between both ends of the square tubes and angle steel to form a rectangular frame. The side frames and conveyor motor are fixed on the square tubes. The two ends of the idler rollers are rotatably installed on the square tubes and angle steel, respectively. The conveyor sprockets and conveyor chains are arranged on the side close to the square tubes.

[0010] Furthermore, the bottom frame includes a protective cover, which is mounted on the square tube and covers all the conveyor sprockets and conveyor chains.

[0011] Furthermore, the bottom frame also includes a plug-in plate, a bracket, and a fixing plate. The square tube has multiple plug-in holes. One end of each plug-in plate is plugged into and fixed in the corresponding plug-in hole of the square tube, and the other end is fixed to the angle steel. The bracket is fixed to the plug-in plate for support inside the protective cover. The fixing plate is fixed to the square tube, and the protective cover is fixedly connected to the fixing plate.

[0012] Furthermore, each fixed frame is equipped with a chain drive assembly. Each chain drive assembly includes multiple sprocket sets, a first chain, and a second chain. Each sprocket set includes two sprockets arranged coaxially. Two sprocket sets are horizontally installed on the top of the fixed frame. One sprocket set is installed on the inner side of the bottom of the fixed frame and is located directly below the two upper sprocket sets. Three sprocket sets are installed on the outer side of the bottom of the fixed frame in a triangular arrangement. One end of the first chain is connected to one end of the top of the side frame and is sequentially wound around a sprocket set located directly above the connection point of the first chain on the top of the fixed frame, the three triangularly arranged sprocket sets, and a sprocket set at the bottom of the fixed frame. The other end of the first chain is connected to the middle of the side frame. One end of the second chain is connected to the other end of the top of the side frame and is sequentially wound around a sprocket set located directly above the connection point of the second chain on the top of the fixed frame, the three triangularly arranged sprocket sets, and a sprocket set at the bottom of the fixed frame. The other end of the second chain is connected to the middle of the side frame.

[0013] Furthermore, the chain lifting mechanism also includes a synchronous shaft and a lifting drive motor. The outermost sprocket group of the three sprocket groups arranged in a triangle on the bottom outer side of each fixed frame is connected by a synchronous shaft. The lifting drive motor is fixed on the fixed frame, and the output shaft of the lifting drive motor is connected to the synchronous shaft for transmission.

[0014] Furthermore, the fixing frame includes a base, columns and a top frame. Two columns are fixed parallel and vertically to the base, and the top frame is fixed to the top of the two columns. Each column includes a groove and a cover plate covering the opening side of the groove. The first chain and the second chain are accommodated in the groove.

[0015] The floor-mounted lifting machine provided by this invention comprises two sets of side roller mechanisms connected by a central roller mechanism to form the main structure for supporting heavy objects. The central roller mechanism radially presses four guide wheels on each side against the corresponding guide rails, ensuring that the bottom frame and side frame on each side are respectively pressed against two fixed frames. Through a simple and compact structural design, the rigidity of the main structure supporting heavy objects is improved, enhancing load-bearing capacity and lifting stability, while reducing damage to goods or safety hazards caused by equipment swaying or vibration. The cooperation between the side roller mechanism and the central roller mechanism not only ensures the stability of goods during transport but also achieves precise positioning of goods during lifting through the sliding cooperation between the guide wheels and guide rails. This design not only improves the operating accuracy of the equipment but also further enhances its reliability.

[0016] The preferred embodiments of the present invention and their beneficial effects will be further described in detail with reference to specific implementation methods. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but should not be construed as limiting the invention. In the drawings,

[0018] Figure 1 This is a three-dimensional assembly diagram of the floor-mounted hoist of the present invention;

[0019] Figure 2 This is a front view of the ground-mounted hoist of the present invention;

[0020] Figure 3 This is a top view of the ground-mounted hoist of the present invention;

[0021] Figure 4 This is a partial structural diagram of the floor-mounted hoist of the present invention;

[0022] Figure 5 This is a perspective view of the load-bearing and conveying platform of the ground-mounted hoist of the present invention;

[0023] Figure 6 This is an exploded view of the load-bearing and conveying platform of the ground-mounted hoist of the present invention;

[0024] Figure 7 This is a front view of the load-carrying and conveying platform of the ground-mounted hoist of the present invention.

[0025] The attached figures are labeled as follows: 1. Chain lifting mechanism; 2. Loading and conveying platform; 11. Fixed frame; 12. Guide rail; 13. Chain drive assembly; 21. Side roller mechanism; 22. Intermediate roller mechanism; 211. Bottom frame; 212. Roller; 213. Side frame; 214. Guide wheel; 221. Channel steel; 222. Intermediate roller; 223. Connecting rod; 224. Connecting plate; 215. Conveyor motor; 216. Conveyor sprocket; 217. Square tube; 2111. Angle steel; 2112. End plate; 2113. Protective cover; 2114. Insert plate; 2115. Bracket; 2116. Fixed plate; 2117. Sprocket assembly; 131. First chain; 132. Second chain; 133. Synchronous shaft; 14. Lifting drive motor; 15. Detailed Implementation

[0026] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0027] Please see Figures 1 to 4 This invention provides a floor-mounted lifting machine, including a chain lifting mechanism 1 and a load-carrying conveying platform 2. The chain lifting mechanism 1 includes a fixed frame 11, guide rails 12, and a chain drive assembly 13. Two fixed frames 11 are fixed to the ground at intervals. Two parallel guide rails 12 are fixed to both sides of each fixed frame 11. The chain drive assembly 13 is mounted on the fixed frame 11 and is drively connected to the load-carrying conveying platform 2 to drive the load-carrying conveying platform 2 to move up and down along the two guide rails 12. The load-carrying conveying platform 2 includes two sets of side roller mechanisms 21 respectively connected to the chain drive assembly 13 and an intermediate roller mechanism 22 connected between the two sets of side roller mechanisms 21. Figure 7 As shown, the side roller mechanism 21 includes a base frame 211, rollers 212, a side frame 213, and guide wheels 214. Multiple rollers 212 are rotatably mounted on the base frame 211 and spaced apart along the long side of the base frame 211. The side frame 213 is vertically fixed to one side of the base frame 211, and four guide wheels 214 are mounted on the side frame 213 to cooperate with two guide rails 12. Two upper and two lower guide wheels 214 are slidably arranged on each guide rail 12. The chain drive assembly 13 is connected to the side frame 213. The four guide wheels 214 on each side are radially pressed against the corresponding guide rail 12 by the intermediate roller mechanism 22.

[0028] The floor-mounted lifting machine provided by this invention comprises two sets of side roller mechanisms 21 connected by a middle roller mechanism 22 to form the main structure for carrying heavy objects. The middle roller mechanism 22 radially presses four guide wheels 214 on each side against the corresponding guide rails 12, so that the bottom frame 211 and side frame 213 on each side are respectively pressed against the two fixed frames 11. Through a simple and compact structural design, the rigidity of the main structure for carrying heavy objects is improved, the load-bearing capacity is enhanced, the stability of lifting is improved, and damage to goods or safety hazards caused by equipment shaking or vibration are reduced. The cooperation between the side roller mechanism 21 and the middle roller mechanism 22 not only ensures the stability of the goods during the conveying process, but also achieves precise positioning of the goods during the lifting process through the sliding cooperation between the guide wheels 214 and the guide rails 12. This design not only improves the operating accuracy of the equipment, but also further enhances the reliability of the equipment.

[0029] Please see Figure 5 In this embodiment, the intermediate roller mechanism 22 includes a channel steel 221, intermediate rollers 222, connecting rods 223, and connecting plate 224. Multiple intermediate rollers 222 are rotatably mounted on the channel steel 221. Connecting rods 223 are connected to both sides of the channel steel 221, and a connecting plate 224 is fixed to one end of the connecting rod 223 away from the channel steel 221. The connecting plate 224 and the base frame 211 are vertically and horizontally connected to balance the lifting errors on both sides, ensuring the smooth operation of the mechanism. The connecting plate 224 is vertically and horizontally connected to the base frame 211 via a pin, or via a spherical bearing.

[0030] Please see Figure 6 In this embodiment, the side idler roller mechanism 21 further includes a conveyor motor 215, a conveyor sprocket 216, and a conveyor chain ring 217. The conveyor motor 215 is mounted on the base frame 211. A conveyor sprocket 216 is mounted on a pin at one end of each idler roller 212. Any two adjacent conveyor sprockets 216 are connected by the conveyor chain ring 217. The conveyor motor 215 drives the conveyor sprockets 216 to rotate. The power generated by the conveyor motor 215 is transmitted to each idler roller 212 through the conveyor chain ring 217, causing each idler roller 212 to rotate, thus automatically conveying the heavy object carried on each idler roller 212.

[0031] Please see Figure 6In this embodiment, the bottom frame 211 includes a square tube 2111, angle steel 2112, end plates 2113, and a protective cover 2114. The square tube 2111 and angle steel 2112 are arranged in parallel, and end plates 2113 are fixedly connected to both ends of the square tube 2111 and angle steel 2112 to form a rectangular frame. The side frame 213 and the conveyor motor 215 are both fixed to the square tube 2111. The two ends of the idler roller 212 are rotatably mounted on the square tube 2111 and the angle steel 2112, respectively. The conveyor sprockets 216 and conveyor rings 217 are arranged on the side closest to the square tube 2111. The protective cover 2114 is installed on the square tube 2111 and covers all the conveyor sprockets 216 and conveyor rings 217. The base frame 211 with the above design has a simple structure, high support strength, and facilitates the installation of multiple idlers 212. The protective cover 2114 effectively prevents workers from being injured during operation and also reduces the impact of external factors on the equipment.

[0032] To further enhance the structural strength of the base frame 211 and facilitate the installation of the protective cover 2114, the base frame 211 also includes a plug-in plate 2115, a bracket 2116, and a fixing plate 2117. Multiple plug-in holes are provided on the square tube 2111. One end of each plug-in plate 2115 is plugged into the corresponding plug-in hole of the square tube 2111, and the other end is fixed to the angle steel 2112. The bracket 2116 is fixed to the plug-in plate 2115 for support inside the protective cover 2114. The fixing plate 2117 is fixed to the square tube 2111, and the protective cover 2114 is fixedly connected to the fixing plate 2117. The introduction of the plug-in plate 2115 ensures a stable connection between the square tube 2111 and the angle steel 2112, making the entire base frame structure more stable and reliable. The bracket 2116 provides solid support for the protective cover 2114, ensuring the stability and safety of its internal structure. This design not only enhances the load-bearing capacity of the protective cover but also effectively prevents deformation or damage that may occur during use, further improving the overall quality of the product. The application of the fixing plate 2117 simplifies the connection process between the protective cover 2114 and the base frame. Through its fixed connection with the square tube 2111, the fixing plate 2117 provides a stable mounting base for the protective cover, making the installation process more convenient and quick. At the same time, this connection method also ensures a tight fit between the protective cover and the base frame, improving the product's sealing and protective performance.

[0033] Please see Figure 4In this embodiment, each fixed frame 11 is provided with a chain drive assembly 13. Each chain drive assembly 13 includes multiple sprocket sets 131, a first chain 132, and a second chain 133. Each sprocket set 131 includes two sprockets arranged coaxially. Two sprocket sets 131 are horizontally mounted on the top of the fixed frame 11, and one sprocket set 131 is mounted on the inner side of the bottom of the fixed frame 11, located directly below the two upper sprocket sets 131. Three sprocket sets 131 arranged in a triangle are mounted on the outer side of the bottom of the fixed frame 11. One end of the first chain 132 is connected to one end of the top of the side frame 213, and is sequentially wound around a sprocket set 131 located directly above the connection point of the first chain 132 on the top of the fixed frame 11, the three triangularly arranged sprocket sets 131, and a sprocket set 131 at the bottom of the fixed frame 11. The other end of the first chain 132 is connected to the middle of the side frame 213. One end of the second chain 133 is connected to the top of the side frame 213, and it sequentially winds around a sprocket assembly 131 located directly above the connection point of the second chain 133 on the top of the fixed frame 11, three sprocket assemblies 131 arranged in a triangle, and a sprocket assembly 131 at the bottom of the fixed frame 11. The other end of the second chain 133 is connected to the middle of the side frame 213. By driving the triangularly arranged sprocket assembly 131 to rotate, the first chain 132 and the second chain 133 move around the corresponding sprocket assembly 131. The side frame 213 can be smoothly lifted by the drive of the first chain 132 and the second chain 133.

[0034] The chain drive assembly 13, through its unique design layout and transmission mechanism, significantly improves the overall working efficiency and stability of the equipment. Specifically, the beneficial effects of this patent are mainly reflected in the following aspects: 1. High-efficiency transmission: Through the carefully configured sprocket sets 131 and chains (first chain 132 and second chain 133), this invention achieves the smooth lifting of the side frame 213. This design ensures that the force transmission during the transmission process is more direct and efficient, thereby effectively improving the overall operating efficiency of the equipment. 2. Strong stability: The chain drive assembly 13 of this invention adopts an arrangement of multiple sprocket sets 131, especially the sprocket set configuration on the inner and outer sides of the bottom of the fixed frame 11, and the connection design between the top and the side frame 213, all of which greatly enhance the stability during the transmission process. This stability is not only reflected in the smooth lifting of the side frame 213, but also in the long-term operation and maintenance of the entire equipment. 3. Compact structure: Through a reasonable spatial layout and the selection of sprocket sets 131, this invention enables the chain drive assembly 13 to achieve a compact structure while maintaining efficient and stable transmission. This not only saves installation space for the equipment, but also facilitates later maintenance and upkeep.

[0035] Please see Figure 1In this embodiment, the chain lifting mechanism 1 also includes a synchronous shaft 14 and a lifting drive motor 15. The outermost sprocket groups of the three sprocket sets 131 arranged in a triangular pattern on the bottom outer side of each fixed frame 11 are connected via the synchronous shaft 14. The lifting drive motor 15 is fixed to the fixed frame 11, and its output shaft is connected to the synchronous shaft 14. Through the innovative design of introducing the synchronous shaft 14 and the lifting drive motor 15, this patent significantly improves the operating efficiency and stability of the chain lifting mechanism. Specifically, the triangular arrangement of the sprocket sets 131 ensures the balance and stability of the chain during lifting, while the connection of the outermost sprocket sets via the synchronous shaft 14 achieves synchronicity in the movement of the chains on both sides. This design effectively avoids the chain offset or asynchrony problems that may occur in traditional lifting mechanisms, thereby greatly improving the safety and reliability of lifting operations. Furthermore, the introduction of the lifting drive motor 15 enables precise control of chain lifting. By connecting the output shaft of the lifting drive motor 15 to the synchronous shaft 14, efficient and stable power transmission during lifting can be ensured, further improving the efficiency of lifting operations. At the same time, due to the flexibility of motor control, this mechanism also has a wider range of adaptability and can meet the lifting needs in different scenarios.

[0036] In this embodiment, the mounting frame 11 includes a base, columns, a top frame, and panels. Two columns are fixed parallel and vertically to the base, and the top frame is fixed to the top of the two columns. Each column includes a groove and a cover plate covering the opening side of the groove. The first chain 132 and the second chain 133 are accommodated in the groove. Two panels are respectively installed on the two sides between the two columns. First, the stability and reliability of the entire mounting frame structure are ensured by the two parallel and vertical columns fixed to the base. This design allows the mounting frame to withstand greater loads and is less prone to deformation or damage during use, thereby improving the service life of the equipment. Second, the combination structure of the groove and the cover plate in the columns provides good accommodation space for the first chain 132 and the second chain 133. This design not only makes the chain arrangement neater and more orderly, but also avoids the risk of the chain being contaminated or damaged in the external environment. At the same time, the opening side of the groove is closed by the cover plate, further enhancing the protection of the chain and ensuring smooth operation of the chain. Furthermore, the design of housing the chain within the slot also brings convenience to operation and maintenance. When the chain needs to be inspected or replaced, it can be easily done by simply opening the cover, without disassembling or moving the entire mounting bracket. This not only saves maintenance time and costs but also improves work efficiency.

[0037] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying importance; the terms "bottom surface" and "top surface," "inner" and "outer" respectively refer to the geometric direction toward or away from a specific component.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A floor-mounted hoist, characterized in that, The system includes a chain lifting mechanism (1) and a load conveying platform (2). The chain lifting mechanism (1) includes a fixed frame (11), guide rails (12), and a chain drive assembly (13). Two fixed frames (11) are fixedly arranged at intervals. Two parallel guide rails (12) are fixed on both sides of each fixed frame (11). The chain drive assembly (13) is installed on the fixed frame (11) and is connected to the load conveying platform (2) to drive the load conveying platform (2) to move up and down along the two guide rails (12). The load conveying platform (2) includes two sets of side roller mechanisms (21) respectively connected to the chain drive assembly (13) and an intermediate roller mechanism (22) connected between the two sets of side roller mechanisms (21). The roller mechanism (21) includes a base frame (211), rollers (212), side frames (213), and guide wheels (214). Multiple rollers (212) are rotatably mounted on the base frame (211) and are spaced apart along the long side of the base frame (211). The side frame (213) is vertically fixed to one side of the base frame (211). Four guide wheels (214) that cooperate with two guide rails (12) are mounted on the side frame (213). Two upper and lower guide wheels (214) are slidably arranged on each guide rail (12). The chain drive assembly (13) is connected to the side frame (213). The four guide wheels (214) on each side are pressed against the corresponding guide rail (12) along their radial direction by the intermediate roller mechanism (22). The intermediate roller mechanism (22) includes a channel steel (221), intermediate rollers (222), connecting rods (223), and connecting plate (224). Multiple intermediate rollers (222) are rotatably mounted on the channel steel (221). Connecting rods (223) are connected to both sides of the channel steel (221). A connecting plate (224) is fixed to one end of the connecting rod (223) away from the channel steel (221). The connecting plate (224) and the bottom frame (211) can be connected vertically to balance the lifting error on both sides.

2. The floor-mounted hoist according to claim 1, characterized in that, The connecting plate (224) is connected to the bottom frame (211) by a pin; or the connecting plate (224) is connected to the bottom frame (211) by a spherical bearing.

3. The floor-mounted hoist according to claim 1, characterized in that, The side roller mechanism (21) also includes a conveyor motor (215), a conveyor sprocket (216), and a conveyor chain (217). The conveyor motor (215) is mounted on the bottom frame (211). A conveyor sprocket (216) is mounted on a pin at one end of each roller (212). Any two adjacent conveyor sprockets (216) are connected by the conveyor chain (217). The conveyor motor (215) is used to drive the conveyor sprocket (216) to rotate.

4. The floor-mounted hoist according to claim 3, characterized in that, The bottom frame (211) includes a square tube (2111), an angle steel (2112), and an end plate (2113). The square tube (2111) and the angle steel (2112) are arranged in parallel. The end plates (2113) are fixedly connected between the two ends of the square tube (2111) and the angle steel (2112) to form a rectangular frame. The side frame (213) and the conveyor motor (215) are fixed on the square tube (2111). The two ends of the roller (212) are rotatably installed on the square tube (2111) and the angle steel (2112), respectively. The conveyor sprocket (216) and the conveyor chain (217) are arranged on the side close to the square tube (2111).

5. The floor-mounted lifting machine according to claim 4, characterized in that, The bottom frame (211) includes a protective cover (2114), which is mounted on the square tube (2111) and covers all the conveyor sprockets (216) and conveyor chains (217).

6. The floor-mounted hoist according to claim 5, characterized in that, The bottom frame (211) also includes a plug-in plate (2115), a bracket (2116), and a fixing plate (2117). The square tube (2111) has multiple plug-in holes. One end of each plug-in plate (2115) is plugged into and fixed in the corresponding plug-in hole of the square tube (2111), and the other end is fixed to the angle steel (2112). The bracket (2116) is fixed to the plug-in plate (2115) for support inside the protective cover (2114). The fixing plate (2117) is fixed to the square tube (2111), and the protective cover (2114) is fixedly connected to the fixing plate (2117).

7. The floor-mounted hoist according to claim 1, characterized in that, Each fixed frame (11) is equipped with a chain drive assembly (13). Each chain drive assembly (13) includes multiple sprocket sets (131), a first chain (132), and a second chain (133). Each sprocket set (131) includes two sprockets arranged coaxially. Two sprocket sets (131) are horizontally mounted on the top of the fixed frame (11). One sprocket set (131) is mounted on the inner bottom of the fixed frame (11) and is located directly below the two upper sprocket sets (131). Three sprocket sets (131) are arranged in a triangular pattern on the outer bottom of the fixed frame (11). One end of the first chain (132) is connected to the top end of the side frame (213) and is sequentially wound around the fixed frame (133). 11) A sprocket assembly (131) located directly above the connection point of the first chain (132), three sprocket assemblies (131) arranged in a triangle, and a sprocket assembly (131) at the bottom of the fixing frame (11). The other end of the first chain (132) is connected to the middle of the side frame (213). One end of the second chain (133) is connected to the other end of the top of the side frame (213), and is sequentially wound around a sprocket assembly (131) located directly above the connection point of the second chain (133) on the top of the fixing frame (11), three sprocket assemblies (131) arranged in a triangle, and a sprocket assembly (131) at the bottom of the fixing frame (11). The other end of the second chain (133) is connected to the middle of the side frame (213).

8. The floor-mounted hoist according to claim 7, characterized in that, The chain lifting mechanism (1) also includes a synchronous shaft (14) and a lifting drive motor (15). The outermost sprocket group of the three sprocket groups (131) arranged in a triangle on the bottom outer side of each fixed frame (11) is connected by the synchronous shaft (14). The lifting drive motor (15) is fixed on the fixed frame (11), and the output shaft of the lifting drive motor (15) is connected to the synchronous shaft (14) for transmission.

9. The floor-mounted hoist according to claim 7, characterized in that, The fixing frame (11) includes a base, columns and a top frame. Two columns are fixed parallel and vertically on the base, and the top frame is fixed to the top of the two columns. The columns include a groove and a cover plate covering the opening side of the groove. The first chain (132) and the second chain (133) are accommodated in the groove.

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