Belt transmission type lifting mechanism

Abstract

A belt transmission type lifting mechanism comprises a guide frame assembly, the upper end of the guide frame assembly is fixedly connected with a building structure above the guide frame assembly, and the lower end of the guide frame assembly is suspended; the sliding frame assembly is in sliding fit with the guide frame assembly and used for arranging a to-be-lifted structure; the upper portion of the connecting frame assembly is fixedly connected with the building structure, and the side face of the connecting frame assembly is fixedly connected with the sliding frame assembly; the driving mechanism comprises a belt and a driving motor fixedly installed on the connecting frame assembly, and the driving motor is in transmission connection with the sliding frame assembly through the belt, so that the sliding frame assembly ascends and descends in the vertical direction under the guiding effect of the guiding frame assembly. Therefore, the lifting mechanism does not occupy ground space, overall layout of a production workshop is facilitated, and the space utilization rate is increased.

Description

Technical Field

[0001] This utility model relates to the field of automotive assembly technology, and in particular to a belt-driven lifting mechanism. Background Technology

[0002] Lifting mechanisms are widely used in automobile assembly and conveying equipment. For fixed lifting stations, vertical guide rails are usually set up based on the production workshop floor, and the lifting of the structure to be lifted is achieved by power drive.

[0003] Because the conveyor lines in the production workshop are intricate and complex, conventional lifting mechanisms require the use of factory floor space, which reduces the utilization rate of the factory floor space and also affects the layout of other conveyor lines, which is not conducive to the overall layout planning of the production workshop. Utility Model Content

[0004] In response to the shortcomings of the existing production technology, the applicant provides a belt-driven lifting mechanism that does not occupy ground space, facilitates the overall layout of the production workshop, and improves space utilization.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A belt-driven lifting mechanism, comprising

[0007] A guide frame assembly, wherein the upper end of the guide frame assembly is fixedly connected to the building structure above it, and the lower end of the guide frame assembly is suspended in the air;

[0008] A sliding frame assembly, which slides in conjunction with the guide frame assembly, is used to set the structure to be lifted or lowered;

[0009] A connecting frame assembly, the upper part of which is fixedly connected to the building structure, and the side of which is fixedly connected to the sliding frame assembly;

[0010] The drive mechanism includes a belt and a drive motor fixedly mounted on the connecting frame assembly. The drive motor is connected to the sliding frame assembly via the belt, so that the sliding frame assembly moves vertically up and down under the guidance of the guide frame assembly.

[0011] As a further improvement to the above technical solution:

[0012] The structure to be lifted is a transfer guide rail. When the sliding frame assembly is in a high position, the structure to be lifted is connected to the high-position guide rail. When the sliding frame assembly is in a low position, the structure to be lifted is connected to the low-position guide rail.

[0013] The guide frame assembly includes a frame structure, on which four guide rails are arranged vertically, and each guide rail includes two mutually perpendicular guide surfaces;

[0014] The sliding frame assembly includes a frame structure located between the four guide rails. The frame structure is provided with multiple sets of roller assemblies, each set of roller assemblies slidingly engaging with a corresponding guide surface. The multiple sets of roller assemblies horizontally confine the frame structure between the four guide rails.

[0015] The guide rail is made of square steel tubing.

[0016] A set of roller assemblies includes: a roller mounting plate, the upper end of which is rotatably mounted on the frame structure, the lower end of which is movably connected to the frame structure, a roller component that slides and engages with a corresponding guide surface mounted on the roller mounting plate, and a limiting component that engages with the lower end of the roller mounting plate mounted on the frame structure. The limiting component applies pressure to the roller mounting plate to keep the roller component in contact with the corresponding guide surface.

[0017] The lower end of the roller mounting plate is provided with an elongated hole in the horizontal direction, and a guide post that slides with the elongated hole is fixedly provided on the frame structure.

[0018] The limiting component includes a mounting block fixedly installed on the frame structure. The mounting block is provided with a screw hole, and a bolt is installed in the screw hole. The end of the bolt applies pressure to the lower end of the roller mounting plate.

[0019] The limiting component includes a mounting block fixedly connected to the frame structure, and a bolt threadedly connected to the mounting block. An adjusting pressure ring is threaded onto the bolt, and a first spring is fitted onto the stud of the bolt. One end of the first spring abuts against the adjusting pressure ring, and the other end of the first spring abuts against the lower end of the roller mounting plate. The first spring is in a compressed state, maintaining the tendency of the roller mounting plate to swing toward the guide surface.

[0020] The number of belts is two, one end of each belt is connected to the upper side of the guide frame assembly, and the other end of each belt is connected to the drive shaft of the drive motor.

[0021] The sliding frame assembly is equipped with a set of moving rollers, and the guide frame assembly above the moving rollers is equipped with a set of fixed rollers. Each belt, after cooperating with the fixed rollers and the moving rollers, forms a U-shape and bears the weight of the sliding frame assembly.

[0022] It also includes a belt breakage detection structure, which includes a clamping plate. One end of the clamping plate is fixedly connected to the belt, and the other end of the clamping plate is provided with a connecting shaft. The connecting shaft is slidably connected to the upper end of the guide frame assembly. A limiting head is provided at the end of the connecting shaft. The limiting head and the guide frame assembly are elastically connected by a second spring. A sensor for detecting the position of the limiting head is provided on the upper part of the guide frame assembly.

[0023] The beneficial effects of this utility model are as follows:

[0024] This utility model has a compact and reasonable structure and is easy to operate. By suspending the guide frame assembly and setting a connecting frame assembly on one side of the guide frame assembly, the guide frame assembly is reinforced while providing installation space for the drive mechanism, reducing the overall weight of the components on the guide frame assembly. The drive mechanism drives the sliding frame assembly to rise and fall on the suspended guide frame assembly, thereby driving the structure to be raised and lowered. This makes the lifting mechanism not occupy ground space, which is convenient for the overall layout of the production workshop and improves space utilization.

[0025] Furthermore, this utility model also has the following advantages:

[0026] (1) In this embodiment, by adjusting the position of the bolt on the limiting member, the roller mounting plate is swung and the installation position of the roller member is changed, thereby realizing the manual adjustment of the sliding fit accuracy between the sliding frame assembly and the guide rail, improving the smoothness of the lifting of the sliding frame assembly, and further ensuring the structural safety of the suspended guide frame assembly.

[0027] (2) An adjusting pressure ring is set on the bolt that is fixed relative to the frame structure. The compression state of the first spring can be adjusted. The first spring applies variable pressure to the lower end of the roller mounting plate, so that each roller can swing slightly with the change of the flatness of the guide surface during the lifting and lowering process of the sliding frame assembly, and always keep the roller in contact with the guide surface, so that the movement process of the sliding frame assembly is more stable and smooth.

[0028] (3) The sliding frame assembly is raised and lowered by using a double belt fixed at one end and a moving roller shaft and a fixed roller shaft. This reduces the overall weight of the drive mechanism and the stress load on the guide frame assembly. The two belts make the driving force evenly applied to the sliding frame assembly, while increasing the safety of the drive mechanism. Attached Figure Description

[0029] Figure 1 This is a perspective view of the present invention.

[0030] Figure 2 This is the front view of the present invention (when the sliding frame assembly is in the high position).

[0031] Figure 3 This is a top view of the present invention.

[0032] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle.

[0033] Figure 5 This is a side view of the present invention (when the sliding frame assembly is in the high position).

[0034] Figure 6 This is a side view of the present invention (when the sliding frame assembly is in the low position).

[0035] Figure 7 This is a schematic diagram (top view) of the assembly structure of the sliding frame assembly and guide rail of this utility model.

[0036] Figure 8 This is a structural schematic diagram (side view) of the sliding frame assembly and guide frame assembly of this utility model.

[0037] Figure 9 for Figure 8 Enlarged view of section B in the middle.

[0038] Figure 10 This is a schematic diagram of the roller assembly structure according to an embodiment of the present invention.

[0039] Figure 11 This is a schematic diagram of the roller assembly structure according to another embodiment of the present invention.

[0040] Among them: 1. Building structures;

[0041] 2. Guide frame assembly; 21. Frame structure; 22. Guide rail; 220. Guide surface; 23. Fixed roller shaft; 24. Auxiliary steering roller shaft;

[0042] 3. Sliding frame assembly; 31. Frame structure; 32. Roller assembly; 321. Roller mounting plate; 322. Roller component; 323. Limiting component; 3231. Mounting block; 3232. Bolt; 3233. Adjusting pressure ring; 3234. First spring; 33. Moving roller shaft;

[0043] 4. Lifting bracket; 5. Structure to be lifted; 6. Loading trolley; 7. Lifting gear; 8. Connecting frame assembly;

[0044] 9. Drive mechanism; 91. Drive motor; 92. Belt; 93. Belt breakage detection structure; 931. Clamping plate; 932. Connecting shaft; 933. Limiting head; 934. Second spring; 935. Sensor; 94. Winding roller. Detailed Implementation

[0045] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0046] See Figure 1 , Figure 1 A perspective view of a belt-driven lifting mechanism according to an embodiment of the present invention is shown. The belt-driven lifting mechanism includes a guide frame assembly 2, a sliding frame assembly 3, a connecting frame assembly 8, and a drive mechanism 9.

[0047] The upper end of the guide frame assembly 2 is fixedly connected to the building structure 1 above it, and the lower end of the guide frame assembly 2 is suspended in the air. The building structure 1 can be the roof frame of the production workshop. The connecting frame assembly 8 is located on the side of the sliding frame assembly 3. The space below the guide frame assembly 2 can be used for the passage of other conveying equipment, increasing the space utilization rate.

[0048] The sliding frame assembly 3 is slidably engaged with the guide frame assembly 2 and is used to set the structure 5 to be lifted and lowered;

[0049] The upper part of the connecting frame assembly 8 is fixedly connected to the building structure 1, and the side of the connecting frame assembly 8 is fixedly connected to the sliding frame assembly 3.

[0050] The drive mechanism 9 includes a belt 92 and a drive motor 91 fixedly mounted on the connecting frame assembly 8. The drive motor 91 is connected to the sliding frame assembly 3 via the belt 92, so that the sliding frame assembly 3 moves vertically under the guidance of the guide frame assembly 2.

[0051] The connecting frame assembly 8 serves as the main installation platform for the drive mechanism 9. A maintenance ladder can be installed on one side of the connecting frame assembly 8, and guardrails can be installed in the maintenance work area.

[0052] The guide frame assembly 2 is suspended and a connecting frame assembly 8 is installed on one side of the guide frame assembly 2. While reinforcing the guide frame assembly 2, it provides installation space for the drive mechanism 9 and reduces the overall weight of the components on the guide frame assembly 2. The drive mechanism 9 drives the sliding frame assembly 3 to rise and fall on the suspended guide frame assembly 2, thereby driving the structure 5 to be raised and lowered. This makes the lifting mechanism not occupy ground space, which is convenient for the overall layout of the production workshop and improves space utilization.

[0053] The belt-driven lifting mechanism includes a control system that is integrated with the control system of the entire production workshop's conveyor line to coordinate and control the lifting of the sliding frame assembly 3. The control system includes electrical components that provide power to the entire belt-driven lifting mechanism and related positioning detection functions.

[0054] In one exemplary embodiment, such as Figures 1-6As shown, the structure to be lifted 5 serves as a transfer guide rail. When the sliding frame assembly 3 is in a high position, the structure to be lifted 5 connects with the high-position guide rail; when the sliding frame assembly 3 is in a low position, the structure to be lifted 5 connects with the low-position guide rail. The high-position guide rail, low-position guide rail, and transfer guide rail are of the same specifications and are used to cooperate with the movement of the cargo trolley 6. It also includes a lifting bracket 4, the upper end of which is fixedly connected to the sliding frame assembly 3, and the lower end of which is fixedly installed with the structure to be lifted 5, so that a sliding channel is formed between the sliding surface of the transfer guide rail and the sliding frame assembly 3, facilitating the movement of the cargo trolley 6. The connecting frame assembly 8 is located on the side of the sliding frame assembly 3, avoiding the conveying direction of the transfer guide rail. The guide frame assembly 2 is located between the high-position guide rail and the low-position guide rail (not shown in the attached figure), which are located on both sides of the lifting station. The cargo trolley 6 is equipped with a lifting device 7 for lifting the parts to be conveyed.

[0055] This embodiment improves upon the EMS (Electrified Monorail System), a conveyor system that utilizes a single electrically driven trolley running on a track. EMS systems are widely used in automotive assembly lines. The track uses lightweight aluminum rails, the lifting equipment is self-powered, and a sliding guide power supply ensures smooth and efficient operation, allowing it to stop at any position. The aluminum rails are lightweight, low-cost, and easy to manufacture. The only drawback is its inability to climb slopes. If the production line requires climbing slopes, modifications to the components or structure of the conveyor line are necessary. This embodiment divides the conveyor track into three sections: a transition rail at one end, and fixed high and low rails. A belt-driven lifting mechanism enables the EMS system to transport materials at different heights without occupying ground space.

[0056] In one exemplary embodiment, such as Figures 7-11 As shown, the guide frame assembly 2 includes a frame structure 21, on which four guide rails 22 are vertically arranged. Each guide rail 22 includes two mutually perpendicular guide surfaces 220. The four guide rails 22 are located at the four vertices of a rectangle, as shown. Figure 7 As shown;

[0057] Continue reading Figures 7-11The sliding frame assembly 3 includes a frame structure 31 located between four guide rails 22. Multiple sets of roller assemblies 32 are mounted on the frame structure 31. Each set of roller assemblies 32 slides in engagement with a corresponding guide surface 220. The multiple sets of roller assemblies 32 horizontally confine the frame structure 31 between the four guide rails 22. At least two sets of roller assemblies 32 correspond to each guide rail 22, each corresponding to one of the two guide surfaces 220 of the guide rail 22. This allows the frame structure 31 to slide in engagement with the guide rails 22 while being confined within the four guide rails 22 from four different directions. For the same guide rail 22, the number of roller assemblies 32 can be four sets, with each pair of sets positioned at different heights on the frame structure 31. Figure 8 As shown, this increases the number of contact points between the sliding frame assembly 3 and the guide rail 22 in the longitudinal direction, thereby improving stability.

[0058] like Figure 7 As shown, the guide rail 22 is a square steel tube. The two adjacent sides of the square steel tube are the guide surfaces 220.

[0059] Since the verticality of the four guide rails 22 and the assembly accuracy between adjacent guide rails 22 directly affect the smoothness of the lifting process of the sliding frame assembly 3, the installation accuracy of the roller assembly 32 becomes a key design consideration. In an exemplary embodiment, such as... Figures 9-11 As shown, the structure of a set of roller assembly 32 includes: a roller mounting plate 321, the upper end of which is rotatably mounted on the frame structure 31, the lower end of which is movably connected to the frame structure 31, a roller component 322 that slides with the corresponding guide surface 220 mounted on the roller mounting plate 321, and a limiting component 323 that cooperates with the lower end of the roller mounting plate 321 mounted on the frame structure 31. The limiting component 323 applies pressure to the roller mounting plate 321 to keep the roller component 322 in contact with the corresponding guide surface 220.

[0060] For example, such as Figure 10 As shown, the lower end of the roller mounting plate 321 has an elongated hole in the horizontal direction, and a guide post that slides through the elongated hole is fixedly mounted on the frame structure 31. The guide post can be a bolt, and one end of the bolt passing through the elongated hole is secured by a nut or washer to prevent it from coming loose. When the limiting member 323 pushes the lower end of the roller mounting plate 321, the guide post moves in the elongated hole, thereby causing the roller 322 to swing along with the roller mounting plate 321.

[0061] In another exemplary embodiment, such as Figure 10As shown, the limiting component 323 includes a mounting block 3231 fixedly installed on the frame structure 31. The mounting block 3231 has a screw hole, and a bolt 3232 is fitted into the screw hole. The end of the bolt 3232 applies pressure to the lower end of the roller mounting plate 321. During the installation and commissioning of the belt-driven lifting mechanism, the position of the bolt 3232 relative to the mounting block 3231 is manually adjusted, and the end of the bolt 3232 is pressed against the lower end of the roller mounting plate 321, so that the roller component 322 is in contact with the guide surface 220.

[0062] In this embodiment, by adjusting the position of the bolt 3232 on the limiting member 323, the roller mounting plate 321 is swung, thereby changing the installation position of the roller member 322. This allows for manual adjustment of the sliding fit accuracy between the sliding frame assembly 3 and the guide rail 22, improving the smoothness of the lifting and lowering of the sliding frame assembly 3, and further ensuring the structural safety of the suspended guide frame assembly 2.

[0063] In another exemplary embodiment, such as Figure 11 As shown, the limiting member 323 includes a mounting block 3231 fixedly connected to the frame structure 31, and a bolt 3232 threadedly connected to the mounting block 3231. An adjusting pressure ring 3233 is threadedly connected to the bolt 3232. A first spring 3234 is sleeved on the stud of the bolt 3232. One end of the first spring 3234 abuts against the adjusting pressure ring 3233, and the other end of the first spring 3234 abuts against the lower end of the roller mounting plate 321. The first spring 3234 is in a compressed state, maintaining the tendency of the roller mounting plate 321 to swing toward the guide surface 220.

[0064] In this embodiment, an adjusting pressure ring 3233 is provided on the bolt 3232 that is fixed relative to the frame structure 31. The compression state of the first spring 3234 can be adjusted. The first spring 3234 applies variable pressure to the lower end of the roller mounting plate 321, so that each roller 322 can swing slightly with the change of the flatness of the guide surface 220 during the lifting and lowering process of the sliding frame assembly 3, and always keep the roller 322 in contact with the guide surface 220, so that the movement of the sliding frame assembly 3 is more stable and smooth.

[0065] In one exemplary embodiment, such as Figure 3 , Figure 7 , Figure 8 As shown, there are two belts 92. One end of each belt 92 is connected to the upper side of the guide frame assembly 2, and the other end of each belt 92 is connected to the drive shaft of the drive motor 91.

[0066] A set of moving rollers 33 is provided on the sliding frame assembly 3, and a set of fixed rollers 23 is provided on the guide frame assembly 2 above the moving rollers 33. Each belt 92, after cooperating with the fixed rollers 23 and the moving rollers 33, forms a U-shape and bears the weight of the sliding frame assembly 3.

[0067] In this embodiment, as Figure 7 , Figure 8 As shown, there are multiple moving roller shafts 33. When the two belts 92 do not share the moving roller shafts 33, the number of moving roller shafts 33 in a set is at least four. There are multiple fixed roller shafts 23. When the two belts 92 do not share the fixed roller shafts 23, the number of fixed roller shafts 23 in a set is at least four. The fixed roller shafts 23 are located above the moving roller shafts 33, offset by one roller shaft diameter, keeping the belts 92 vertical. An auxiliary steering roller shaft 24 is also provided between the fixed roller shaft 23 and the drive motor 91. The belts 92 pass over the auxiliary steering roller shaft 24 and connect to the winding roller 94. The winding roller 94 is connected to the drive shaft of the drive motor 91. Figure 3 As shown, there are two drive motors 91, one of which is a spare. The two belts 92 increase the safety of the drive mechanism 9 and reduce the risk of the sliding frame assembly 3 falling due to the breakage of the belts 92.

[0068] The 92 belt material is usually made of rubber, polyester, steel wire rope core lifting belt, etc., and has a certain amount of slight elongation to meet the requirements of lifting accuracy.

[0069] The sliding frame assembly 3 is raised and lowered by using a double belt 92 fixed at one end, a moving roller shaft 33 and a fixed roller shaft 23. This reduces the overall weight of the drive mechanism 9 and the stress on the guide frame assembly 2. The two belts 92 make the driving force evenly applied to the sliding frame assembly 3, while increasing the safety of the drive mechanism 9.

[0070] During the operation of the belt-driven lifting mechanism, the drive motor 91 rotates in the forward direction, and the winding roller 94 rotates to wind the belt 92. The belt 92 becomes shorter and shorter as it is wound, thereby driving the sliding frame assembly 3 to rise. When the drive motor 91 rotates in the reverse direction, the winding roller 94 rotates in the reverse direction, releasing the wound belt 92, and the sliding frame assembly 3 descends by its own gravity.

[0071] In one exemplary embodiment, such as Figure 3 , Figure 4 As shown, it also includes a belt breakage detection structure 93, which includes a clamping plate 931. One end of the clamping plate 931 is fixedly connected to the belt 92, and the other end of the clamping plate 931 is provided with a connecting shaft 932. The connecting shaft 932 is slidably connected to the upper end of the guide frame assembly 2. The end of the connecting shaft 932 is provided with a limiting head 933. The limiting head 933 and the guide frame assembly 2 are elastically connected by a second spring 934. The guide frame assembly 2 is provided with a sensor 935 for detecting the position of the limiting head 933.

[0072] Each belt 92 is connected to the guide frame assembly 2 via a belt breakage detection structure 93, which is used to detect whether the corresponding belt 92 is broken. When the belt 92 is in a normal state, the second spring 934 is in a compressed state and the limit head 933 is in a normal position. When the belt 92 breaks, the second spring 934 extends and the limit head 933 disengages from its normal position, which is detected by the sensor 935 and an alarm is sent to the lifting control system.

[0073] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A belt-driven lifting mechanism, characterized in that: include The upper end of the guide frame assembly (2) is fixedly connected to the building structure (1) above it, and the lower end of the guide frame assembly (2) is suspended in the air; The sliding frame assembly (3) slides in cooperation with the guide frame assembly (2) and is used to set the structure to be lifted (5). The upper part of the connecting frame assembly (8) is fixedly connected to the building structure (1), and the side of the connecting frame assembly (8) is fixedly connected to the sliding frame assembly (3). The drive mechanism (9) includes a belt (92) and a drive motor (91) fixedly mounted on the connecting frame assembly (8). The drive motor (91) is connected to the sliding frame assembly (3) via the belt (92) so that the sliding frame assembly (3) moves vertically under the guidance of the guide frame assembly (2).

2. The belt-driven lifting mechanism as described in claim 1, characterized in that: The structure to be lifted (5) is a transfer guide rail. When the sliding frame assembly (3) is in a high position, the structure to be lifted (5) is connected to the high position guide rail. When the sliding frame assembly (3) is in a low position, the structure to be lifted (5) is connected to the low position guide rail.

3. The belt-driven lifting mechanism as described in claim 1, characterized in that: The guide frame assembly (2) includes a frame structure (21), on which four guide rails (22) are arranged vertically, and each guide rail (22) includes two mutually perpendicular guide surfaces (220). The sliding frame assembly (3) includes a frame structure (31) located between the four guide rails (22). The frame structure (31) is provided with multiple sets of roller assemblies (32), each set of roller assemblies (32) slidingly engaging with the corresponding guide surface (220). The multiple sets of roller assemblies (32) horizontally confine the frame structure (31) between the four guide rails (22).

4. The belt-driven lifting mechanism as described in claim 3, characterized in that: The guide rail (22) is a square steel pipe.

5. The belt-driven lifting mechanism as described in claim 3, characterized in that: A set of roller assemblies (32) includes: a roller mounting plate (321), the upper end of which is rotatably mounted on the frame structure (31), the lower end of which is movably connected to the frame structure (31), a roller component (322) that slides with the corresponding guide surface (220) is mounted on the roller mounting plate (321), and a limiting component (323) that cooperates with the lower end of the roller mounting plate (321) is mounted on the frame structure (31). The limiting component (323) applies pressure to the roller mounting plate (321) to keep the roller component (322) in contact with the corresponding guide surface (220).

6. The belt-driven lifting mechanism as described in claim 5, characterized in that: The lower end of the roller mounting plate (321) is provided with an elongated hole in the horizontal direction, and a guide column that slides with the elongated hole is fixedly provided on the frame structure (31).

7. The belt-driven lifting mechanism as described in claim 5, characterized in that: The limiting member (323) includes a mounting block (3231) fixedly installed on the frame structure (31). The mounting block (3231) is provided with a screw hole, and a bolt (3232) is installed in the screw hole. The end of the bolt (3232) applies pressure to the lower end of the roller mounting plate (321).

8. The belt-driven lifting mechanism as described in claim 5, characterized in that: The limiting member (323) includes a mounting block (3231) fixedly connected to the frame structure (31) and a bolt (3232) threadedly connected to the mounting block (3231). An adjusting pressure ring (3233) is threadedly connected to the bolt (3232). A first spring (3234) is sleeved on the stud of the bolt (3232). One end of the first spring (3234) abuts against the adjusting pressure ring (3233), and the other end of the first spring (3234) abuts against the lower end of the roller mounting plate (321). The first spring (3234) is in a compressed state, maintaining the tendency of the roller mounting plate (321) to swing toward the guide surface (220).

9. The belt-driven lifting mechanism as described in claim 1, characterized in that: The number of belts (92) is two, one end of each belt (92) is connected to the upper side of the guide frame assembly (2), and the other end of each belt (92) is connected to the drive shaft of the drive motor (91). A set of moving rollers (33) is provided on the sliding frame assembly (3), and a set of fixed rollers (23) is provided on the guide frame assembly (2) above the moving rollers (33). Each belt (92) forms a U-shape after cooperating with the fixed rollers (23) and the moving rollers (33), and bears the weight of the sliding frame assembly (3).

10. The belt-driven lifting mechanism as described in claim 1 or 9, characterized in that: It also includes a belt breakage detection structure (93), which includes a clamping plate (931). One end of the clamping plate (931) is fixedly connected to a belt (92), and the other end of the clamping plate (931) is provided with a connecting shaft (932). The connecting shaft (932) is slidably connected to the upper end of the guide frame assembly (2). The end of the connecting shaft (932) is provided with a limiting head (933). The limiting head (933) and the guide frame assembly (2) are elastically connected by a second spring (934). The guide frame assembly (2) is provided with a sensor (935) for detecting the position of the limiting head (933).

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