Composite machining center for machining cooling fan

Abstract

The invention relates to the technical field of drilling machining, and discloses a composite machining center for cooling fan machining. A drilling unit used for fan shell tapping machining is assembled in the machine frame, a base is assembled on the machine frame through a translation unit arranged in the machine frame, a blowing mechanism connected with an external airflow supply assembly is assembled at the top of the base, a rotating shaft is assembled at the top of the base, and a blowing mechanism connected with an external airflow supply assembly is assembled at the bottom of the rotating shaft. A bearing plate is fixedly connected to the outer surface of the circumference of the rotating shaft, and a restraining piece used for limiting a fan shell is assembled on the bearing plate through a translation unit arranged at the top of the bearing plate. According to the composite machining center for machining the cooling fan, the problems that in the prior art, a blind hole has the structural characteristic that one end of the blind hole is closed, part of metal chippings generated when a drilling tool cuts a metal material cannot be smoothly discharged along with cutting fluid, a manual cleaning link needs to be additionally arranged, and the overall machining efficiency is reduced can be effectively solved.

Description

Technical Field

[0001] This invention relates to the field of drilling technology, and more specifically to a composite machining center for machining cooling fans. Background Technology

[0002] As the core protective and load-bearing component of the entire computer fan, the processing precision and structural stability of the computer fan directly affect the overall performance and service life of the computer fan. In order to meet the stringent requirements of computer fan casings for structural strength, impact resistance and heat dissipation performance, existing technologies mostly use metal materials such as aluminum alloy and stainless steel to manufacture computer fan casings. These metal materials have become the mainstream choice for computer fan casing production due to their excellent mechanical properties and physicochemical characteristics.

[0003] During the assembly of a computer fan, multiple blind holes need to be machined on the metal casing to facilitate the positioning and installation of internal components such as the fan blade shaft, motor, and mounting bracket. Currently, the blind hole machining of the metal casing of computer fans is mostly completed using traditional drilling equipment.

[0004] However, due to the closed structure of blind holes, some metal chips generated by the drilling tool cannot be smoothly discharged with the cutting fluid. In the existing processing flow, a manual cleaning step is usually added after the drilling process is completed. Operators use tools such as brushes and air guns to clean the inside of the fan housing one by one, which reduces the overall processing efficiency. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a composite machining center for processing cooling fans. This effectively solves the problem in existing technologies where blind holes have a closed structure at one end, causing some metal chips generated by the drilling tool during metal cutting to be unable to be smoothly discharged with the cutting fluid, requiring an additional manual cleaning step and reducing overall processing efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a composite machining center for processing cooling fans, comprising: frame; The frame is equipped with a drilling unit for drilling holes in the fan housing. The frame is equipped with a base via a translation machine located inside it. A purging mechanism connected to an external airflow supply component is mounted on the top of the base. A rotating shaft is mounted on the top of the base, and a bearing plate is fixedly connected to the outer circumference of the rotating shaft. The bearing plate is equipped with a constraint member for limiting the fan housing via a translation machine located on its top. The base is fixedly connected to a drive component for driving the rotating shaft to rotate along its own central axis. After the rotating shaft rotates 180 degrees along its central axis, the blowing mechanism can blow airflow onto the fan housing limited by the constraint component to remove the debris generated during the drilling process of the fan housing.

[0007] Furthermore, the bearing plate is slidably connected to a shaft through a mounting hole on its top, and the shaft is provided in two sets and symmetrically distributed along the center plane of the bearing plate. Each set of the shafts has multiple shafts and is arranged in an array along the center line of the bearing plate. A side plate is fixedly connected to the top of the shafts in the same set, and a magnetic component is fixedly connected to the bottom of the bearing plate. The magnetic component is magnetically connected to the outer circumferential surface of the shaft.

[0008] Furthermore, the side plate has an integrally formed initial section and abutment section on the side near the fan housing, and the width of the initial section is smaller than the width of the abutment section.

[0009] Furthermore, the constraint includes a movable plate, which is slidably connected to a movable frame via a guide groove on its top. Two movable frames are provided and symmetrically distributed along the center plane of the movable plate. A support plate is fixedly connected to the top of the movable plate, and a guide rod connected to the outside of the movable frame is slidably connected inside the support plate. The end of the guide rod away from the movable frame is spherically designed. The movable frame is connected to the outside of the support plate via a return spring on its outside.

[0010] Furthermore, the movable frame is slidably connected to a constraint block via a groove on its outer side, and there are two constraint blocks symmetrically distributed along the central plane of the movable frame. The constraint block has a guide slope on the side near the fan housing.

[0011] Furthermore, a movable rod that penetrates the interior of the movable frame is fixedly connected inside the constraint block, and a compression spring is sleeved on the outer circumferential surface of the movable rod.

[0012] Furthermore, the constraint also includes an auxiliary mechanism for limiting the fan housing during its rotation. The auxiliary mechanism includes a fixing block, which is fixedly connected to the top of the movable frame on the side away from the rotating shaft. Two fixing blocks are provided and are symmetrically distributed along the central plane of the movable frame.

[0013] Furthermore, the fixing block is slidably connected to a sliding rod through a slot formed inside it, and a circular wire spring is sleeved on the outer circumference of the sliding rod. A counterweight ball is fixedly connected to one end of the sliding rod near the fan housing.

[0014] The technical solution provided by this invention has the following advantages compared with the prior art: This invention includes a constraint component and a rotating shaft. The driving component drives the rotating shaft to rotate the bearing plate and the fan housing on the constraint component by 180 degrees, so that the blind hole opening faces downward. The trapped debris and cutting fluid accumulate at the opening end under the action of gravity. At this time, the blowing mechanism cooperates with the external airflow supply component to blow directional airflow into the blind hole, completely expelling the accumulated debris without the need for additional manual cleaning. During the rotation process, the counterweight ball block drives the slide rod to extend along the slot of the fixed block under its own weight. The extension length of the slide rod is adapted to the size of the fan housing, forming an axial limit on the workpiece to prevent it from falling out of the constraint cavity. After rotating to the blowing station, the circular spring drives the slide rod to reset, which does not affect the subsequent part removal and avoids the problem of workpiece deformation, cracks and other scrap due to collision. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the base according to an embodiment of the present invention; Figure 3 This is a three-dimensional separation structure diagram of the support plate and constraint member according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the three-dimensional separation structure of the constraint member according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the three-dimensional separation structure of the moving frame and the constraint block according to an embodiment of the present invention; Figure 6 This is a three-dimensional separation structure diagram of the fixing block and the sliding rod according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the three-dimensional separation structure of the support plate and the side plate in an embodiment of the present invention.

[0017] The labels in the diagram represent: 1. Frame; 2. Drilling unit; 3. Base; 31. Blowing mechanism; 4. Rotating shaft; 41. Bearing plate; 411. Shaft; 412. Side plate; 413. Magnetic component; 5. Constraint component; 51. Moving plate; 52. Moving frame; 521. Constraint block; 522. Movable rod; 523. Fixed block; 524. Sliding rod; 525. Counterweight ball block; 53. Support plate; 54. Guide rod. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] The present invention will be further described below with reference to embodiments.

[0020] Example: Please see Figures 1-7 This invention provides a technical solution: a composite machining center for processing cooling fans, comprising: Rack 1; The frame 1 is equipped with a drilling unit 2 for drilling holes in the fan housing. The frame 1 is equipped with a base 3 via a translation machine set inside it. The top of the base 3 is equipped with a purging mechanism 31 connected to an external airflow supply component. The top of the base 3 is equipped with a rotating shaft 4, and a bearing plate 41 is fixedly connected to the outer circumference of the rotating shaft 4. The bearing plate 41 is equipped with a constraint member 5 for limiting the fan housing via a translation machine set on its top. The base 3 is fixedly connected to a drive component for driving the rotating shaft 4 to rotate along its own central axis. After the rotating shaft 4 rotates 180 degrees along its central axis, the blowing mechanism 31 can blow airflow onto the fan housing limited by the constraint member 5 to remove the debris generated during the drilling process of the fan housing.

[0021] The bearing plate 41 is slidably connected to the shaft 411 through the mounting hole on its top. There are two sets of shafts 411 symmetrically distributed along the center plane of the bearing plate 41. Each set of shafts 411 has multiple shafts 411 arranged in an array along the center line of the bearing plate 41. The top of the shafts 411 in the same set is fixedly connected to the side plate 412. The bottom of the bearing plate 41 is fixedly connected to the magnetic element 413, and the magnetic element 413 is magnetically connected to the outer circumferential surface of the shaft 411.

[0022] The side panel 412 has an integrally formed initial section and abutment section on the side near the fan housing, and the width of the initial section is smaller than the width of the abutment section.

[0023] The constraint member 5 includes a movable plate 51, which is slidably connected to a movable frame 52 via a guide groove on its top. The movable frame 52 has two frames symmetrically distributed along the center plane of the movable plate 51. A support plate 53 is fixedly connected to the top of the movable plate 51, and a guide rod 54 connected to the outside of the movable frame 52 is slidably connected inside the support plate 53. The end of the guide rod 54 away from the movable frame 52 is spherical. The movable frame 52 is connected to the outside of the support plate 53 via a return spring on its outside.

[0024] The movable frame 52 is slidably connected to the constraint block 521 through a groove on its outer side, and there are two constraint blocks 521 that are symmetrically distributed along the center plane of the movable frame 52. The constraint block 521 has a guide slope on the side near the fan housing.

[0025] The constraint block 521 is fixedly connected to a movable rod 522 that passes through the interior of the movable frame 52, and a compression spring is sleeved on the outer circumference of the movable rod 522.

[0026] The constraint 5 also includes an auxiliary mechanism for limiting the fan housing during the flipping process. The auxiliary mechanism includes a fixing block 523, which is fixedly connected to the top of the movable frame 52 on the side away from the rotating shaft 4. There are two fixing blocks 523, which are symmetrically distributed along the center plane of the movable frame 52.

[0027] The fixed block 523 is slidably connected to the slide rod 524 through a slot formed inside it, and a circular wire spring is sleeved on the outer circumference of the slide rod 524. A counterweight ball block 525 is fixedly connected to one end of the slide rod 524 near the fan housing.

[0028] The working principle and advantages of this composite machining center used for processing cooling fans: In the actual machining process of the fan housing, the operator must first complete the positioning and clamping operation of the workpiece to be processed. The core purpose of this process is to avoid machining accuracy deviations caused by workpiece displacement when the drilling equipment performs blind hole machining.

[0029] In the constraint member 5 used in this invention, the operator places the fan housing to be processed inside the constraint member 5. Initially, the movable plate 51 inside the constraint member 5 is in its initial position, and the symmetrically distributed movable frames 52 mounted on it are at their maximum spacing. Furthermore, the two constraint blocks 521 arranged on the same side of the same movable frame 52 also maintain their maximum spacing. In this state, the movable frame 52 and the constraint blocks 521 on the same side form a "U-shaped positioning structure." The two sets of this structure enclose the initial positioning space of the fan housing to be processed, allowing the operator to smoothly place the workpiece into this positioning space.

[0030] It is worth noting that the constraint block 521 has a guide slope on the side facing the workpiece. This slope divides the clamping surface of the constraint block 521 into a low-position area and a high-position area: the low-position area is located away from the moving frame 52, and the high-position area is located close to the moving frame 52. The slope achieves a smooth transition between the two areas. In the initial state, the low-position areas of the four constraint blocks 521 enclose an initial positioning space, the size of which is slightly larger than the outer dimensions of the fan housing; the constraint space enclosed by the high-position areas has an initial size slightly smaller than the outer dimensions of the fan housing, reserving an adaptation allowance for subsequent clamping.

[0031] After the operator places the fan housing into the initial positioning space, the constraint block 521 has not yet formed an effective clamp. At this time, the translation unit on the bearing plate 41 drives the moving plate 51 to translate towards the preset processing position. The spherical end of the guide rod 54 on the moving frame 52 first contacts the initial section of the side plate 412. As the translation unit continues to drive, the guide rod 54 moves with the moving plate 51 and gradually abuts against the abutting section of the side plate 412. The width of the abutting section is greater than that of the initial section. Under the squeezing action of the abutting section, the guide rod 54 drives the moving frame 52 to synchronously approach the center of the workpiece. Because the two sets of side plates 412 on the bearing plate 41 are symmetrically distributed, the two sets of moving frames 52 achieve synchronous translation along the central axis of the guide rod 54 under the cooperative action of the side plates 412.

[0032] As the spacing between the moving frames 52 gradually decreases, the constraint blocks 521 on the moving frames 52 are displaced along the central axis of the movable rod 522 with the help of the guide slope of the constraint blocks 521. When the two sets of moving frames 52 approach each other synchronously, the size of the constraint space enclosed by the high-position area of ​​the four sets of constraint blocks 521 gradually increases until it completely matches the outer dimensions of the fan housing. At this time, under the elastic preload of the compression spring, the constraint blocks 521 apply a uniform clamping force to the workpiece, realizing the precise positioning and reliable fixation of the fan housing.

[0033] It is worth noting that since the fan housing is mostly made of thin-walled metal, the clamping force applied by the compression spring and the constraint block 521 will not generate excessive clamping load. If the clamping force exceeds the preset threshold, it is easy to cause plastic deformation of the workpiece, resulting in the workpiece needing secondary correction or even being scrapped directly.

[0034] The fan housing requires multiple blind holes machined within its interior cavity. These blind holes are used for the assembly and positioning of core components such as fan blades, drive motors, and mounting brackets. In the traditional machining process, operators use specialized tooling to fix the metal housing under the drilling equipment, ensuring the machining surface faces the drilling actuator. After positioning, the drilling unit 2 on the frame 1 is operated to machine the blind holes at preset coordinates. Because the blind holes are closed at one end, the metal chips generated during drilling are difficult to completely remove with the cutting fluid. Some chips and cutting fluid remain at the bottom of the blind holes, requiring an additional manual cleaning process, which reduces machining efficiency.

[0035] In this invention, after the blind hole processing of the fan housing is completed, the drilling equipment in the frame 1 exits the working area. The operator drives the rotating shaft 4 on the base 3 to rotate at a constant speed around its central axis through the driving component, which drives the fan housing positioned by the bearing plate 41 and the constraint component 5 to rotate synchronously with the rotating shaft 4 until the bearing plate 41 completes a 180-degree flip around the axis of the rotating shaft 4.

[0036] After the flipping action is completed, the machined surface of the fan housing changes from facing upwards to facing downwards, with the blind hole opening vertically downwards, precisely aligned with the blowing mechanism 31 on the base 3. At this time, the cutting fluid and metal chips retained at the bottom of the blind hole detach from the hole wall under the action of gravity and accumulate at the opening. The blowing mechanism 31, in conjunction with the external airflow supply component, blows a directional airflow into the blind hole to completely discharge the accumulated chips and cutting fluid, avoiding secondary chip residue and balancing machining quality and efficiency.

[0037] During the flipping operation, the constraint block 521 within the constraint mechanism only provides radial restraint to the fan housing. Due to the weight of the fan housing itself, it can generate an axial component force. When this axial component force exceeds the threshold of the axial static friction force between the constraint block 521 and the workpiece, the workpiece is prone to axial movement and detachment from the constraint cavity, potentially leading to a fall. After the thin-walled metal housing impacts the base 3, it is prone to plastic deformation, cracks, and surface scratches. Due to the characteristics of the thin-walled structure, these defects cannot be repaired through secondary processing, ultimately resulting in the direct scrapping of the workpiece. Simultaneously, unexpected displacement of the fan housing can cause misalignment between the blind hole and the blowing mechanism 31, leading to a significant increase in the chip residue rate.

[0038] In this invention, during the process of the drive component, in conjunction with the rotating shaft 4, driving the constraint component 5 and the fan housing to rotate from the initial processing position to a vertical state, the movable frame 52 on the side away from the rotating shaft 4 is equipped with symmetrically distributed fixed blocks 523. Each fixed block 523 contains a sliding rod 524, and a counterweight ball block 525 is located at the end of the sliding rod 524 near the fixed seat. This counterweight ball block 525 is made of high-density material and has a large inertial mass. In the initial state, the counterweight ball's gravity is vertically downward, and the circular spring and the sliding rod 524 are in mechanical equilibrium. The counterweight ball block 525 is housed within the slot of the fixed block 523, without interfering with the normal positioning and processing of the fan housing.

[0039] When the rotating shaft 4 drives the bearing plate 41 to flip from the initial state to the vertical state, the counterweight ball, under its own weight, generates a driving force that overcomes the elastic threshold of the circular spring, driving the slide rod 524 to make linear displacement along the central axis of the slot until the counterweight ball 525 reaches the maximum stroke limit. At this time, the length of the slide rod 524 extending out of the slot is greater than half the size of the fan housing but does not exceed its total size, thereby achieving the axial limiting and blocking function of the fan housing.

[0040] The rotating shaft 4 continues to rotate, driving the fan housing to flip to the preset purging position (i.e., the support plate 41 and the base 3 are parallel). At this time, the gravitational torque generated by the counterweight ball 525 is insufficient to overcome the elastic threshold of the circular spring. The circular spring drives the slide rod 524 and the counterweight ball 525 to reset along the central axis of the slot. Since the slide rod 524 and the slot are damped, when the support plate 41 and the base 3 are parallel, the circular spring will not drive the counterweight ball 525 to immediately reset to the initial storage position. There is a certain time delay in the reset process of the slide rod 524. The purging mechanism 31 can complete the chip blowing and cleaning operation of the blind hole of the fan housing during this delay period.

[0041] After the blind hole cleaning operation is completed, the magnetic component 413 (using an electromagnet for easy electronic control) at the bottom of the support plate 41 loses power, and its attraction to the shaft 411 disappears. Under its own weight, the side plate 412 slides down along the central axis of the shaft 411, misaligning with the guide rod 54 and releasing the constraint on the guide rod 54. After the guide rod 54 loses the mechanical constraint of the side plate 412, the moving frame 52 returns to its initial position under the elastic force of the return spring, the constraint state of the fan housing is released, and it then falls off the constraint mechanism to the base 3, facilitating the operator to collect the workpiece.

[0042] It is worth noting that when the fan housing is in the purging position, the distance between it and the base 3 is designed to avoid impact damage during the fall. In addition, an elastic buffer pad can be added to the surface of the base 3 to further optimize the buffer protection effect of the workpiece falling.

[0043] At the same time, the drive unit, together with the rotating shaft 4, drives the bearing plate 41 to reset, and the translation unit drives the constraint 5 to reset to the initial working position, preparing for the next workpiece processing cycle.

[0044] The present invention employs constraint component 5 and rotating shaft 4, which has the following advantages: Firstly, the collaborative design of "rotating shaft 4 + blowing mechanism 31" solves the pain point of requiring manual cleaning of debris after traditional blind hole machining. After drilling, the drive unit drives the rotating shaft 4 to rotate the fan housing on the bearing plate 41 and constraint member 5 by 180 degrees, so that the blind hole opening faces downward. The trapped debris and cutting fluid gather at the opening end under the action of gravity. At this time, the blowing mechanism 31 cooperates with the external airflow supply component to blow directional airflow into the blind hole, completely expelling the gathered debris. There is no need to add an extra manual cleaning process, reducing process changeover time and improving the overall machining process efficiency.

[0045] Secondly, the constraint component 5 adopts a collaborative structure of "moving frame 52 + constraint block 521 + guide rod 54 + side plate 412" to achieve precise positioning. When the translation unit drives the moving plate 51 to translate, the spherical end of the guide rod 54 transitions to the abutment section along the initial section of the side plate 412. Under the squeezing action of the side plate 412, the two sets of symmetrical moving frames 52 synchronously approach the center of the workpiece. The guide slope provided by the constraint block 521 cooperates with the compression spring to make the four constraint blocks 521 form evenly distributed clamping points, apply a stable elastic preload to the fan housing, avoid workpiece displacement during drilling, and ensure that the positional accuracy and dimensional tolerance of the blind hole meet the requirements.

[0046] Thirdly, when the constraint component 5 is flipped, the fan housing itself generates an axial component force due to its own weight, which may cause axial movement. At this time, the counterweight ball block 525 drives the slide rod 524 to extend along the slot of the fixing block 523 under its own weight. The extension length of the slide rod 524 is adapted to the size of the fan housing, forming an axial limit on the workpiece to prevent it from falling out of the constraint cavity. After flipping to the purging station, the round wire spring drives the slide rod 524 to reset, which does not affect the subsequent part removal and avoids the workpiece from being scrapped due to deformation, cracks and other problems caused by collision.

[0047] Fourthly, the contact between the counterweight ball 525 and the workpiece is a "point contact" (actually a very small contact patch): the arc-shaped structure of the spherical surface can disperse the limiting pressure, and the compressive stress distribution is more uniform under the same limiting force, avoiding excessive local pressure that could damage the workpiece; at the same time, the spherical surface has a centrally symmetrical structure, so if the workpiece is slightly offset to the left or right or misaligned up or down, the spherical surface can automatically adjust the contact point through the guiding effect of the arc-shaped surface, so that the limiting force always points to the central axis of the workpiece, forming a "self-centering limiting" effect.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite machining center for processing cooling fans, characterized in that, include: Rack (1); The frame (1) is equipped with a drilling unit (2) for drilling holes in the fan housing. The frame (1) is equipped with a base (3) by a translation machine set inside it. The base (3) is equipped with a purging mechanism (31) connected to an external air supply component. The base (3) is equipped with a rotating shaft (4) on top. A bearing plate (41) is fixedly connected to the outer circumference of the rotating shaft (4). The bearing plate (41) is equipped with a constraint member (5) for limiting the fan housing by a translation machine set on top of it. The base (3) is fixedly connected to a drive component for driving the rotating shaft (4) to rotate along its own central axis. After the rotating shaft (4) rotates 180 degrees along its central axis, the blowing mechanism (31) can blow airflow to the fan housing limited by the constraint member (5) to remove the debris generated during the drilling process of the fan housing.

2. The composite machining center for processing cooling fans according to claim 1, characterized in that: The bearing plate (41) is slidably connected to a shaft (411) through a mounting hole on its top. The shaft (411) is provided in two sets and is symmetrically distributed along the center plane of the bearing plate (41). Each set of the shaft (411) is provided with multiple shafts and is arranged in an array along the center line of the bearing plate (41). A side plate (412) is fixedly connected to the top of the shaft (411) in the same set. A magnetic element (413) is fixedly connected to the bottom of the bearing plate (41), and the magnetic element (413) is magnetically connected to the outer circumference of the shaft (411).

3. A composite machining center for processing cooling fans according to claim 2, characterized in that: The side plate (412) has an integrally formed initial section and abutment section on the side near the fan housing, and the width of the initial section is smaller than the width of the abutment section.

4. A composite machining center for processing cooling fans according to claim 1, characterized in that: The constraint member (5) includes a movable plate (51), which is slidably connected to a movable frame (52) via a guide groove on its top. The movable frame (52) has two frames symmetrically distributed along the center plane of the movable plate (51). A support plate (53) is fixedly connected to the top of the movable plate (51), and a guide rod (54) connected to the outside of the movable frame (52) is slidably connected inside the support plate (53). The end of the guide rod (54) away from the movable frame (52) is spherical. The movable frame (52) is connected to the outside of the support plate (53) via a return spring on its outside.

5. A composite machining center for processing cooling fans according to claim 4, characterized in that: The movable frame (52) is slidably connected to a constraint block (521) through a groove on its outer side, and there are two constraint blocks (521) symmetrically distributed along the center plane of the movable frame (52). The constraint block (521) has a guide slope on the side near the fan housing.

6. A composite machining center for processing cooling fans according to claim 5, characterized in that: The constraint block (521) is fixedly connected to a movable rod (522) that penetrates the interior of the movable frame (52), and a compression spring is sleeved on the outer circumference of the movable rod (522).

7. A composite machining center for processing cooling fans according to claim 1, characterized in that: The constraint member (5) also includes an auxiliary mechanism for limiting the fan housing during the flipping process. The auxiliary mechanism includes a fixing block (523), which is fixedly connected to the top of the movable frame (52) on the side away from the rotating shaft (4). There are two fixing blocks (523) and they are symmetrically distributed along the center plane of the movable frame (52).

8. A composite machining center for processing cooling fans according to claim 7, characterized in that: The fixed block (523) is slidably connected to the slide rod (524) through a slot formed inside it, and a circular wire spring is sleeved on the outer circumference of the slide rod (524). A counterweight ball block (525) is fixedly connected to one end of the slide rod (524) near the fan housing.

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