Screw locking machine for cooling fan production

Abstract

The invention provides a screw locking machine for cooling fan production, and relates to the technical field of screw locking machines, the screw locking machine comprises a base, two fixing structures, an auxiliary structure and two moving structures, the upper surface of the base is fixedly connected with a table top, and the upper surface of the table top is fixedly connected with two connecting frames; a connecting frame is installed on the upper surface of the base, a moving assembly is installed on the upper surface of the connecting frame, a screw locking assembly is installed on the surface of the moving assembly, two containing plates are arranged on the upper surface of the base and connected with the table top through moving structures, and a fixing structure is arranged at one end of each containing plate and comprises a sliding rail. The sliding rail is fixedly connected with the placing plate, two sliding blocks are slidably connected to the inner wall of the sliding rail, notches are formed in the inner walls of the sliding blocks, rotating shafts are rotatably connected to the inner walls of the notches, and adjusting rods are fixedly connected to the arc surfaces of the rotating shafts. The fan fixing device has the effect of conveniently, rapidly and accurately fixing fans of different sizes.

Description

Technical Field

[0001] This invention relates to the field of screw fastening machine technology, and more particularly to a screw fastening machine for the production of cooling fans. Background Technology

[0002] A cooling fan wire-locking machine is an automated device used in the production process of cooling fans for electronic devices. Its main function is to securely connect the fan motor and the cooling fan blades together using wires or other methods to ensure that the fan operates efficiently and stably during operation.

[0003] Existing technologies, such as the invention with publication number CN104368961B, disclose a screw-fastening machine. This patent employs a machine frame, a fastening device, a first moving mechanism, a suction fixture, an air-blowing fixture, and a second moving mechanism. The fastening device has a screwdriver head. The first moving mechanism drives the machine frame to move. The suction fixture has a suction head. The air-blowing fixture has a nozzle. The suction fixture and the air-blowing fixture are interchangeably mounted in the screw-fastening machine. When installed, the suction fixture connects to the fastening device and suctions at least one screw to the suction head, allowing the screwdriver head to fasten the screw to a workpiece. When installed, the air-blowing fixture connects to the machine frame and supplies screws to the nozzle by air blowing. The second moving mechanism connects the fastening device and the machine frame, driving the fastening device to move relative to the machine frame, allowing the screwdriver head to pass through the air-blowing fixture to the nozzle, fastening the screw to the workpiece.

[0004] The inventors discovered during use that when using a fan wire-locking machine, the relative position between the wire-locking assembly and the fan needs precise control during the wire-locking operation. However, existing equipment often lacks convenient and stable adjustment and fixing mechanisms for the fan platform, causing the fan to easily shake or shift during the wire-locking process, affecting wire-locking accuracy and work efficiency. Furthermore, when wire-locking fans of different sizes, traditional fixing methods are inconvenient to adjust and have poor adaptability, increasing operational difficulty and time costs. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and to propose a screw fastening machine for the production of cooling fans.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a screw-locking machine for producing cooling fans, comprising a base, two fixed structures, an auxiliary structure, and two movable structures. A table is fixedly connected to the upper surface of the base, and two connecting frames are fixedly connected to the upper surface of the table. A movable component is installed on the upper surface of the connecting frame, and a screw-locking component is installed on the surface of the movable component. Two placement plates are provided on the upper surface of the base, and the placement plates are connected to the table via the movable structures. A fixed structure is provided at one end of each placement plate. The fixed structure includes a slide rail, which is fixedly connected to the placement plate. Two sliders are slidably connected to the inner wall of the slide rail. A slot is opened in the inner wall of each slider, and a rotating shaft is rotatably connected to the inner wall of the slot. An adjusting rod is fixedly connected to the arc surface of the rotating shaft, and a connecting piece is rotatably connected to the end of the adjusting rod away from the rotating shaft. A hydraulic rod is installed on the side of the slide rail near the connecting piece, and the output end of the hydraulic rod is fixedly connected to the connecting piece. A connecting plate is fixedly connected to the upper surface of each slider, and a fixed plate is fixedly connected to the end of the connecting plate away from the slider.

[0007] By adopting this preferred solution, when the fan is placed on the mounting plate for fixation, the hydraulic rod can be activated to push the connecting piece to move, thereby causing the adjusting rod to rotate around the pivot. This causes the two sliders to move closer or further apart on the inner wall of the slide rail, allowing the connecting plate to move synchronously with the fixing plate. This achieves stable clamping of fans of different sizes, effectively preventing the fan from shaking or shifting during the locking process, and improving the convenience and stability of fixing.

[0008] Preferably, anti-slip pads are fixedly connected to the sides of the two fixed plates that are close to each other, and the anti-slip pads are rubber pads.

[0009] By adopting this preferred solution, the anti-slip pad can increase the friction between the fixing plate and the fan, thus preventing the fixing plate from sliding when fixing the fan.

[0010] Preferably, a limiting rod is fixedly connected inside the slide rail, and the limiting rod is slidably connected to the slider.

[0011] By adopting this preferred solution, the limiting rod can limit the slider, preventing the slider from deviating when sliding on the inner wall of the slide rail, thus improving the stability of the slider sliding.

[0012] Preferably, the arc surface of the limiting rod is fitted with two springs, and the two ends of the springs are fixedly connected to the slider and the slide rail, respectively.

[0013] By adopting this preferred solution, the spring can apply an elastic buffering force to the slider during its sliding process. When the hydraulic rod drives the slider to move, the spring will generate corresponding stretching or compression deformation according to the direction of slider movement. This effectively reduces the impact force when the slider approaches the end of the slide rail or stops moving, preventing the slider from colliding hard with the inner wall of the slide rail and causing damage. At the same time, it also makes the slider move more smoothly, improving the overall service life and operational stability of the fixed structure.

[0014] Preferably, an auxiliary structure is provided on the side of the two placement plates that are close to each other. The auxiliary structure includes two fixing blocks, which are fixedly connected to the two placement plates respectively. A connecting groove is provided on the inner wall of the fixing block, and a connecting block is interference-connected to the inner wall of the connecting groove. A connecting rod is fixedly connected to the end of the two connecting blocks that are close to each other.

[0015] By adopting this preferred solution, when it is necessary to connect and move two placement plates, the connecting block can be embedded into the connecting groove of the corresponding placement plate, so that the connecting rod can firmly connect the two fixed blocks, thereby realizing the synchronous linkage of the two placement plates. This effectively avoids the problem of offset or asynchrony when a single placement plate moves, improves the coordination and stability of the overall operation, ensures that the components remain stable during movement, and reduces the risk of position deviation caused by shaking.

[0016] Preferably, the arc surface of the connecting rod is provided with a plurality of friction grooves, and the plurality of friction grooves are evenly distributed on the connecting rod.

[0017] By adopting this preferred solution, the friction groove can increase the friction between the hand and the connecting rod, thus preventing slippage when the connecting rod is pulled.

[0018] Preferably, a positioning rod is fixedly connected inside the connecting groove, and the positioning rod is slidably connected to the connecting block.

[0019] By adopting this preferred solution, the positioning rod can make the installation of the connecting block faster, greatly improving the installation efficiency of the connecting block.

[0020] Preferably, the upper surface of the tabletop is provided with two movable structures, each movable structure including a connecting strip, which is fixedly connected to the tabletop and slidably connected to a placement plate. Two sliding frames are fixedly connected to the lower surfaces of both sides of the placement plate, and limit strips are slidably connected to the inner walls of the sliding frames. The limit strips are fixedly connected to the tabletop. Two connecting plates are fixedly connected to the lower surface of the placement plate, and two auxiliary plates are fixedly connected to the upper surface of the tabletop. A tension spring is provided between the auxiliary plates and the connecting plates, with both ends of the tension spring fixedly connected to the auxiliary plates and the connecting plates, respectively.

[0021] By adopting this preferred solution, when the placement plate needs to be moved, the sliding frame slides along the limiting strip to achieve smooth displacement of the placement plate. At the same time, the connecting plate moves with the placement plate and stretches or compresses the tension spring. The elastic force of the tension spring plays a buffering and resetting role in the movement of the placement plate, ensuring that the placement plate will not shake violently during the movement, thus improving the stability and convenience of operation.

[0022] Preferably, a sliding rod is fixedly connected to the side of the auxiliary plate near the connecting plate, the sliding rod is slidably connected to the connecting plate, and the tension spring is sleeved on the arc surface of the sliding rod.

[0023] By adopting this preferred solution, the slide bar can limit the spring, preventing the spring from deforming during use and improving the service life of the tension spring.

[0024] Preferably, the limiting strip has an I-shaped cross-section, and the two limiting strips are located on both sides of the connecting strip.

[0025] By adopting this preferred solution, the limiting strip and the sliding frame can limit the placement plate, preventing the placement plate from shifting during use.

[0026] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1. In this invention, by setting a fixing structure, it is possible to conveniently, quickly, and accurately fix fans of different sizes. When it is necessary to fix the fan, simply activate the hydraulic rod, and its output end will push the connecting piece to move. The connecting piece will then drive the adjusting rod to rotate around the axis. This rotation will cause the two sliders to move closer or further apart along the limiting rod on the inner wall of the slide rail. The movement of the sliders drives the connecting plate to move synchronously, thereby allowing the fixing plate to be adjusted according to the actual size of the fan, achieving a stable clamping.

[0027] 2. In this invention, by setting up an auxiliary structure, it is possible for the operator to easily embed the connecting block into the connecting groove of the fixing block on the two placement plates when it is necessary to connect the two placement plates for synchronous movement. The positioning rod inside the connecting groove can quickly guide the connecting block to be accurately inserted, greatly improving installation efficiency. When the connecting block is fully embedded in the connecting groove, the connecting rod will firmly connect the two fixing blocks into a whole, thereby realizing the synchronous linkage of the two placement plates.

[0028] 3. In this invention, by setting a movable structure, the placement plate can be easily pushed to move smoothly on the table and has good buffering and reset performance. When the position of the placement plate needs to be adjusted, the operator can directly push the placement plate. At this time, the sliding frame on both sides of the lower surface of the placement plate will slide stably along the I-shaped limit strip fixed on the table. The I-shaped limit strip design can effectively prevent the sliding frame from falling off or deviating during the sliding process, ensuring the accuracy of the movement trajectory of the placement plate. Attached Figure Description

[0029] Figure 1 This invention provides a three-dimensional structural diagram of a screw-fastening machine for producing cooling fans; Figure 2 This invention provides a schematic diagram of the fixing structure of a screw-fastening machine for the production of cooling fans; Figure 3 This invention proposes a screw fastening machine for the production of cooling fans. Figure 2 Enlarged view of point A; Figure 4 This invention provides a schematic diagram of an auxiliary structure for a screw-fastening machine used in the production of cooling fans. Figure 5 This invention proposes a screw fastening machine for the production of cooling fans. Figure 4 Enlarged view of point B; Figure 6 This invention presents a schematic diagram of the moving structure of a screw-locking machine for producing cooling fans.

[0030] Legend: 1. Base; 2. Tabletop; 3. Connecting frame; 4. Locking wire assembly; 5. Moving assembly; 6. Placement plate; 7. Fixing structure; 701. Slide rail; 702. Fixing plate; 703. Connecting piece; 704. Adjusting rod; 705. Hydraulic rod; 706. Anti-slip pad; 707. Connecting plate; 708. Slider; 709. Rotating shaft; 710. Limiting rod; 711. Spring; 712. Groove; 8. Auxiliary structure; 81. Connecting rod; 82. Friction groove; 83. Connecting block; 84. Fixing block; 85. Positioning rod; 86. Connecting groove; 9. Moving structure; 91. Connecting strip; 92. Connecting plate; 93. Auxiliary plate; 94. Limiting strip; 95. Slide frame; 96. Tension spring; 97. Slide rod. Detailed Implementation

[0031] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0032] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0033] Example 1, such as Figure 1-6 As shown, the present invention provides a screw-locking machine for producing cooling fans, comprising a base 1, two fixed structures 7, an auxiliary structure 8, and two movable structures 9. The machine is characterized in that: a table 2 is fixedly connected to the upper surface of the base 1; two connecting frames 3 are fixedly connected to the upper surface of the table 2; a movable component 5 is mounted on the upper surface of the connecting frame 3; a screw-locking component 4 is mounted on the surface of the movable component 5; two placement plates 6 are provided on the upper surface of the base 1; the placement plates 6 are connected to the table 2 via the movable structures 9; a fixed structure 7 is provided at one end of each placement plate 6; an auxiliary structure 8 is provided on the side of the two placement plates 6 that are close to each other; and two movable structures 9 are provided on the upper surface of the table 2.

[0034] The following section will explain the specific setup and function of its fixed structure 7, auxiliary structure 8, and movable structure 9.

[0035] like Figure 2 and Figure 3As shown, the fixed structure 7 includes a slide rail 701, which is fixedly connected to the placement plate 6. Two sliders 708 are slidably connected to the inner wall of the slide rail 701. The inner wall of the slider 708 has a slot 712. The inner wall of the slot 712 is rotatably connected to a rotating shaft 709. An adjusting rod 704 is fixedly connected to the arc surface of the rotating shaft 709. A connector 703 is rotatably connected to the end of the adjusting rod 704 away from the rotating shaft 709. A hydraulic rod 705 is installed on the side of the slide rail 701 near the connector 703. The output end of the hydraulic rod 705 is fixedly connected to the connector 703. A connecting plate 707 is fixedly connected to the upper surface of the slider 708. A fixing plate 702 is fixedly connected to the end of the connecting plate 707 away from the slider 708. When the fan is placed on the mounting plate 6 for fixation, the hydraulic rod 705 can be activated to push the connecting piece 703 to move, thereby causing the adjusting rod 704 to rotate around the pivot 709. This causes the two sliders 708 to move closer or further apart on the inner wall of the slide rail 701, allowing the connecting plate 707 to move synchronously with the fixing plate 702. This achieves stable clamping of fans of different sizes, effectively preventing the fan from shaking or shifting during the locking process, and improving the convenience and stability of fixation. Anti-slip pads 706, which are rubber pads, are fixedly connected to the side of the two fixing plates 702 that are close to each other. The anti-slip pads 706 increase the friction between the fixing plate 702 and the fan, preventing the fixing plate 702 from sliding when fixing the fan. A limit rod 710 is fixedly connected inside the slide rail 701, and the limit rod 710 is slidably connected to the slider 708. The limiting rod 710 can limit the slider 708, preventing it from deviating when sliding on the inner wall of the slide rail 701, thus improving the stability of the slider 708's sliding. Two springs 711 are fitted onto the arc surface of the limiting rod 710, with both ends of the springs 711 fixedly connected to the slider 708 and the slide rail 701, respectively. The springs 711 apply elastic buffering force to the slider 708 during its sliding process. When the hydraulic rod 705 moves the slider 708, the springs 711 will undergo corresponding tensile or compressive deformation according to the direction of movement of the slider 708. This effectively reduces impact force when the slider 708 approaches the end of the slide rail 701 or stops moving, preventing damage caused by a hard collision between the slider 708 and the inner wall of the slide rail 701. It also makes the movement of the slider 708 smoother, improving the overall service life and operational stability of the fixed structure 7.

[0036] like Figure 4 and Figure 5As shown, the auxiliary structure 8 includes two fixing blocks 84, which are fixedly connected to two placement plates 6 respectively. The inner wall of each fixing block 84 has a connecting groove 86, and a connecting block 83 is interference-fitted into the inner wall of the connecting groove 86. A connecting rod 81 is fixedly connected to one end of each connecting block 83 that is close to the other. When it is necessary to connect and move the two placement plates 6, the connecting block 83 can be embedded into the connecting groove 86 of the corresponding placement plate 6, allowing the connecting rod 81 to securely connect the two fixing blocks 84. This achieves synchronous linkage between the two placement plates 6, effectively avoiding the problem of offset or asynchrony when a single placement plate 6 moves. This improves the coordination and stability of the overall operation, ensuring that the components remain stable during movement and reducing the risk of positional deviation caused by shaking. Several friction grooves are evenly distributed on the arc surface of the connecting rod 81. The friction groove increases the friction between the hand and the connecting rod 81, preventing slippage when pulling the connecting rod 81. A positioning rod 85 is fixedly connected inside the connecting groove 86, and the positioning rod 85 is slidably connected to the connecting block 83. The positioning rod 85 allows for faster installation of the connecting block 83, greatly improving the installation efficiency of the connecting block 83.

[0037] like Figure 1 and Figure 6 As shown, the movable structure 9 includes a connecting strip 91, which is fixedly connected to the table 2 and slidably connected to the placement plate 6. Two sliding frames 95 are fixedly connected to the lower surfaces of both sides of the placement plate 6. Limiting strips 94 are slidably connected to the inner walls of the sliding frames 95. The limiting strips 94 are fixedly connected to the table 2. Two connecting plates 92 are fixedly connected to the lower surface of the placement plate 6. Two auxiliary plates 93 are fixedly connected to the upper surface of the table 2. A tension spring 96 is provided between the auxiliary plate 93 and the connecting plate 92. The two ends of the tension spring 96 are fixedly connected to the auxiliary plate 93 and the connecting plate 92, respectively. When the placement plate 6 needs to be moved, the sliding frame 95 slides along the limiting strip 94 to achieve smooth displacement of the placement plate 6. At the same time, the connecting plate 92 moves with the placement plate 6 and stretches or compresses the tension spring 96. The elastic force of the tension spring 96 provides a buffer and reset assist for the movement of the placement plate 6, ensuring that the placement plate 6 does not shake violently during movement, thus improving the stability and convenience of operation. A sliding rod 97 is fixedly connected to the side of the auxiliary plate 93 near the connecting plate 92. The sliding rod 97 is slidably connected to the connecting plate 92, and the tension spring 96 is sleeved on the arc surface of the sliding rod 97. The sliding rod 97 can limit the spring 711, preventing the spring 711 from deforming during use and improving the service life of the tension spring 96. The limiting strip 94 has an I-shaped cross-section, and the two limiting strips 94 are located on both sides of the connecting strip 91. The limiting strip 94 and the sliding frame 95 can limit the placement plate 6, preventing the placement plate 6 from shifting during use.

[0038] The overall working principle is as follows: when the fan is placed on the mounting plate 6 for fixation, the hydraulic rod 705 is activated, causing its output end to push the connecting piece 703 to move. This, in turn, drives the adjusting rod 704 to rotate around the pivot 709, causing the two sliders 708 to move closer or further apart on the inner wall of the slide rail 701. This allows the connecting plate 707 to move synchronously with the fixing plate 702, achieving stable clamping of fans of different sizes. This effectively prevents the fan from shaking or shifting during the locking process, improving the convenience and stability of fixation. The anti-slip pad 706 increases the friction between the fixing plate 702 and the fan, preventing the fixing plate 702 from sliding when fixing the fan. The limit rod 710 can... The slider 708 is limited to prevent it from deviating when sliding on the inner wall of the slide rail 701, thus improving the stability of the slider 708's sliding. The spring 711 can apply elastic buffering force to the slider 708 during its sliding process. When the hydraulic rod 705 drives the slider 708 to move, the spring 711 will generate corresponding tensile or compressive deformation according to the direction of movement of the slider 708. This effectively reduces the impact force when the slider 708 approaches the end of the slide rail 701 or stops moving, preventing the slider 708 from hardly colliding with the inner wall of the slide rail 701 and causing damage. At the same time, it can also make the movement of the slider 708 more stable, improving the overall service life and operational stability of the fixed structure 7.

[0039] When it is necessary to connect and move two placement plates 6, the connecting block 83 can be embedded into the connecting groove 86 of the corresponding placement plate 6, so that the connecting rod 81 can firmly connect the two fixing blocks 84, thereby realizing the synchronous linkage of the two placement plates 6. This effectively avoids the problem of offset or asynchrony when a single placement plate 6 moves, improves the coordination and stability of the overall operation, ensures that the parts remain stable during movement, and reduces the risk of position deviation caused by shaking. The friction groove can increase the friction between the hand and the connecting rod 81, preventing slippage when pulling the connecting rod 81. The positioning rod 85 can make the installation of the connecting block 83 faster, greatly improving the installation efficiency of the connecting block 83.

[0040] When the placement plate 6 needs to be moved, the sliding frame 95 slides along the limiting strip 94 to achieve a smooth displacement of the placement plate 6. At the same time, the connecting plate 92 moves with the placement plate 6 and stretches or compresses the tension spring 96. The elastic force of the tension spring 96 plays a buffering and restoring role in the movement of the placement plate 6, ensuring that the placement plate 6 will not shake violently during the movement, thus improving the stability and convenience of operation. The sliding rod 97 can limit the spring 711 to prevent the spring 711 from deforming during use, thereby improving the service life of the tension spring 96. The limiting strip 94 and the sliding frame 95 can limit the placement plate 6 to prevent it from shifting during use.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A screw-fastening machine for producing cooling fans, comprising a base (1), two fixed structures (7), an auxiliary structure (8), and two movable structures (9), characterized in that: A tabletop (2) is fixedly connected to the upper surface of the base (1). Two connecting frames (3) are fixedly connected to the upper surface of the tabletop (2). A moving component (5) is installed on the upper surface of the connecting frame (3). A locking wire component (4) is installed on the surface of the moving component (5). Two placement plates (6) are provided on the upper surface of the base (1). The placement plates (6) are connected to the tabletop (2) by means of a moving structure (9). A fixing structure (7) is provided at one end of the placement plate (6). The fixing structure (7) includes a slide rail (701). The slide rail (701) is fixedly connected to the placement plate (6). Two sliders (708) are slidably connected to the inner wall of the slide rail (701). The inner wall of the slider (708) is provided with a slot (712), and the inner wall of the slot (712) is rotatably connected to a rotating shaft (709). An adjusting rod (704) is fixedly connected to the arc surface of the rotating shaft (709). A connecting piece (703) is rotatably connected to the end of the adjusting rod (704) away from the rotating shaft (709). A hydraulic rod (705) is installed on the side of the slide rail (701) near the connecting piece (703). The output end of the hydraulic rod (705) is fixedly connected to the connecting piece (703). A connecting plate (707) is fixedly connected to the upper surface of the slider (708). A fixing plate (702) is fixedly connected to the end of the connecting plate (707) away from the slider (708).

2. A screw-fastening machine for producing cooling fans according to claim 1, characterized in that: Anti-slip pads (706) are fixedly connected to the sides of the two fixed plates (702) that are close to each other. The anti-slip pads (706) are rubber pads.

3. A screw-fastening machine for producing cooling fans according to claim 1, characterized in that: The slide rail (701) is internally fixedly connected to a limiting rod (710), and the limiting rod (710) is slidably connected to the slider (708).

4. A screw-fastening machine for producing cooling fans according to claim 1, characterized in that: The arc surface of the limiting rod (710) is fitted with two springs (711), and the two ends of the springs (711) are fixedly connected to the slider (708) and the slide rail (701) respectively.

5. A screw-fastening machine for producing cooling fans according to claim 1, characterized in that: An auxiliary structure (8) is provided on one side of the two placement plates (6) that are close to each other. The auxiliary structure (8) includes two fixing blocks (84). The two fixing blocks (84) are fixedly connected to the two placement plates (6) respectively. A connecting groove (86) is provided on the inner wall of the fixing block (84). A connecting block (83) is interference-connected to the inner wall of the connecting groove (86). A connecting rod (81) is fixedly connected to one end of the two connecting blocks (83) that are close to each other.

6. A screw-fastening machine for producing cooling fans according to claim 5, characterized in that: The connecting rod (81) has several friction grooves on its arc surface, and the friction grooves are evenly distributed on the connecting rod (81).

7. A screw fastening machine for producing cooling fans according to claim 5, characterized in that: A positioning rod (85) is fixedly connected inside the connecting groove (86), and the positioning rod (85) is slidably connected to the connecting block (83).

8. A screw-fastening machine for producing cooling fans according to claim 1, characterized in that: The upper surface of the tabletop (2) is provided with two movable structures (9). The movable structure (9) includes a connecting strip (91). The connecting strip (91) is fixedly connected to the tabletop (2). The connecting strip (91) is slidably connected to the placement plate (6). Two sliding frames (95) are fixedly connected to the lower surfaces on both sides of the placement plate (6). A limit strip (94) is slidably connected to the inner wall of the sliding frame (95). The limit strip (94) is fixedly connected to the tabletop (2). Two connecting plates (92) are fixedly connected to the lower surface of the placement plate (6). Two auxiliary plates (93) are fixedly connected to the upper surface of the tabletop (2). A tension spring (96) is provided between the auxiliary plate (93) and the connecting plate (92). The two ends of the tension spring (96) are fixedly connected to the auxiliary plate (93) and the connecting plate (92) respectively.

9. A screw-fastening machine for producing cooling fans according to claim 8, characterized in that: The auxiliary plate (93) is fixedly connected to a slide rod (97) on the side near the connecting plate (92). The slide rod (97) is slidably connected to the connecting plate (92), and the tension spring (96) is sleeved on the arc surface of the slide rod (97).

10. A screw-fastening machine for producing cooling fans according to claim 8, characterized in that: The cross-section of the limiting strip (94) is I-shaped, and the two limiting strips (94) are located on both sides of the connecting strip (91).

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