Fan cover top assembly tool capable of achieving automatic limiting

Abstract

The invention relates to the technical field of fan cover machining devices, in particular to an automatic limiting fan cover top assembly tool which comprises a base, a center column is fixedly connected to the middle of the base, a steel ring limiting mechanism is connected to the peripheral side of the center column, and the steel ring limiting mechanism comprises a supporting arm, a sliding block, a spring pipe and an air pump. A plurality of supporting arms are arranged on the base, one ends of the supporting arms are fixedly connected to the peripheral side of the center column, the other ends of the supporting arms are fixedly connected to the base, and a plurality of sliding blocks are slidably connected to the supporting arms. Therefore, automatic concentric limiting and fixing of single steel rings from small diameters to large diameters can be carried out on the multiple steel rings, welding of the steel rings and steel bars is facilitated, the limiting speed of the steel rings with different diameters can be greatly increased, and then the welding speed of the fan cover is increased.

Description

Technical Field

[0001] The invention relates to the technical field of fan cover processing devices, and in particular to a fan cover top assembly tool capable of automatically limiting position. Background Art

[0002] The top of the existing fan cover is generally composed of multiple concentric steel rings and steel bars that fix the multiple steel rings. This structure saves more materials than punching holes in the plate and effectively reduces the processing cost. When welding a fan cover composed of multiple steel rings and steel bars, it is generally necessary to use a processing tool to place the steel rings and steel bars. The traditional fan cover tool generally has a limit groove for the entire fan cover to sink into, thereby determining the position of the steel ring and steel bar. This method has low adaptability to fan covers of different specifications and cannot complete the welding operation of fan covers of different specifications.

[0003] In the prior art, there is a method of using a movable limit block, locking the limit block by rotating a bolt, so as to move the limit block to a corresponding position to limit steel rings of different diameters. However, in this method, when welding fan covers of different specifications, it is necessary to readjust the position of the limit block, which is rather troublesome; and it is impossible to form an automatic limit effect for steel rings of different diameters, thereby reducing the welding efficiency; and it has high requirements for the placement of the steel rings, and the steel rings need to be accurately placed on the same side of multiple limit blocks of the same diameter, thereby increasing the workload of the staff. Summary of the invention

[0004] The present invention proposes an automatically position-limiting fan hood top assembly tool, the purpose of which is to solve the problem that in the traditional technology, the position of the steel ring and the steel bar is determined by the limit groove for the entire fan hood to sink into, and the welding operation of fan hoods of different specifications cannot be completed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A fan cover top assembly tool with automatic limiting function comprises a base, a center column is fixedly connected to the middle of the base, a steel ring limiting mechanism is connected to the outer peripheral side of the center column, the steel ring limiting mechanism comprises a support arm, a sliding block, a spring tube and an air pump, one end of a plurality of support arms is fixedly connected to the outer peripheral side of the center column, and the other end is fixedly connected to the base, a plurality of sliding blocks are slidably connected to the support arm, wherein steel rings of different diameters are placed on the support arm between the plurality of sliding blocks, a connecting pipe is fixedly connected inside the sliding block, both ends of two adjacent connecting pipes are connected to the same spring tube, an exhaust pipe is connected to the middle of the connecting pipe, the exhaust pipe adopts a three-way pipe, and the exhaust pipe is away from the connecting pipe One end of the tube is connected with the outside and points to the point where the steel ring is to be welded. An electromagnetic valve is installed in the connection between the connecting tube and the exhaust pipe. The air pump is installed on the base. The output end of the air pump is connected with an output pipe. The output pipe is connected to one end away from the air pump and multiple connecting tubes close to the center column through a spring tube. Multiple clamping grooves are provided on the outer peripheral side of the center column. A steel bar fixing mechanism is fixedly connected to the base. The multiple steel bar fixing mechanisms correspond to the multiple clamping grooves one by one. The output end and the clamping groove of the steel bar fixing mechanism are connected with fixing components, wherein the two ends of the steel bar are connected in the output ends of the two fixing components, and the steel bar fixing mechanism is used to form a radial extrusion force on the steel bar pointing to the center column.

[0007] Preferably, a sliding groove is provided on the support arm, and the sliding groove is arranged to penetrate the end away from the center column. A fixing cap is clamped on the end of the sliding groove away from the center column. Multiple sliding blocks are slidably connected in the sliding groove, which is convenient for installing different numbers of sliding blocks and is conducive to adapting to fan covers with different numbers of steel rings.

[0008] Preferably, the solenoid valve adopts a two-position three-way valve, wherein in the initial state of the solenoid valve, one end of the connecting pipe close to the center column is connected to the exhaust pipe and the connection between the two ends of the connecting pipe is blocked, so that the airflow introduced can form a pushing force on the sliding block through the connecting pipe on the one hand, and the blown airflow can accelerate the cooling of the welding point on the other hand. In the working state, the two ends of the connecting pipe are connected and the connection between the connecting pipe and the exhaust pipe is blocked, so that the airflow can have the same driving effect on the connecting pipe on the next sliding block.

[0009] Preferably, the top of the sliding block protrudes from the support arm, and a frame groove is opened through the side away from the center column, a rotating frame is connected in the frame groove for sliding along the axial direction of the support arm, a rotating roller is rotatably connected in the rotating frame, and the rotating roller rests on the inner circumference of the steel ring away from the frame groove, a piezoelectric sheet is installed between the rotating frame and the inner wall of the frame groove, multiple piezoelectric sheets are electrically connected to the controller, multiple piezoelectric sheets correspond to multiple solenoid valves one by one, a controller is installed on the base, and the controller is electrically connected to the air pump, multiple solenoid valves and external welding equipment.

[0010] Preferably, when the controller is working, it receives piezoelectric signals from multiple piezoelectric sheets at the same diameter position with the central column as the center, and sends a welding indication signal to the external welding equipment, then receives a welding completion signal from the external welding equipment, and controls the operation of multiple solenoid valves corresponding to the multiple piezoelectric sheets.

[0011] Preferably, the rotating roller is in a truncated cone shape, wherein the truncated cone-shaped rotating roller is invertedly connected in the rotating frame, and when the rotating roller abuts against the steel ring, a downward squeezing force is formed on the steel ring, which is beneficial to form a fixing effect on the steel ring.

[0012] The top end of the vertical cam is fixedly provided with a support frame, and the top end of the vertical cam is fixedly provided with a support frame, and the top end of the vertical cam is fixedly connected with the horizontal rod in the radial direction of the central column, wherein the vertical slide groove is through-set near the central column, and the vertical slide groove is rotatably connected with the rotating rod near the central column, and the rotating rod is fixedly connected with the clamping frame at one end of the horizontal rod near the central column, and the clamping frame is connected with a fixing component through the elastic force of the supporting spring to form an extrusion fixing effect on the steel bars in the fixing components on the clamping frame and the clamping slot, so as to facilitate fixing of steel bars of different lengths and improve the welding adaptability of fan covers of different specifications.

[0013] Preferably, the fixing assembly includes a fixing frame, a fixing block and a fixing spring, the fixing frame is clamped in the clamping slot and the clamping frame, wherein the two fixing frames located in the clamping slot and the clamping frame are open on opposite sides, a fixing block is slidably connected in the fixing frame along the vertical direction, a fixing spring is fixedly connected between the bottom of the fixing block and the bottom of the fixing frame, and the top of the fixing frame is flush with the upper surface of the support arm to ensure the contact between the steel bar and the steel ring.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. In the present invention, by setting a steel ring limiting mechanism, the power output by the air pump cooperates with the piezoelectric sheet and the solenoid valve to control the movement of multiple sliding blocks one by one, so that multiple steel rings can be automatically concentrically limited and fixed from a small diameter to a large diameter single steel ring, which is convenient for welding of steel rings and steel bars, and can greatly improve the limiting speed of steel rings with different diameters, thereby improving the welding speed of the fan cover.

[0016] 2. In the present invention, by setting a two-position three-way solenoid valve, when performing welding operation, the air flow output by the air pump passes through the front half of the connecting pipe and the two output ends of the exhaust pipe and blows to the two adjacent welding points, thereby accelerating the cooling speed of the welding points and further improving the welding efficiency.

[0017] 3. In the present invention, by setting up a steel bar fixing mechanism, it is convenient to fix steel bars of different lengths, thereby improving the welding adaptability to fan covers of different specifications. At the same time, the steel bar fixing mechanism is located at the end of the steel bar and not directly below the steel bar, which effectively prevents welding slag generated by welding from falling onto the steel bar fixing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 for Figure 1 The enlarged schematic diagram of part A in the middle;

[0020] Figure 3 It is a schematic diagram of the connection between the connecting tube and the spring tube of the present invention;

[0021] Figure 4 It is a schematic diagram of the positions of the air pump and the output pipe of the present invention;

[0022] Figure 5 It is a cross-sectional schematic diagram of the steel bar fixing mechanism of the present invention.

[0023] In the figure: 1 base, 2 center column, 21 clamping groove, 3 steel ring limiting mechanism, 4 support arm, 41 sliding groove, 5 sliding block, 51 connecting pipe, 52 solenoid valve, 53 exhaust pipe, 6 spring tube, 7 rotating frame, 8 rotating roller, 9 air pump, 91 output pipe, 10 steel bar fixing mechanism, 11 edge column, 12 vertical slider, 13 supporting spring, 14 horizontal rod, 15 rotating rod, 16 clamping frame, 17 fixing assembly, 171 fixing frame, 172 fixing block, 173 fixing spring. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Reference Figure 1-4A fan cover top assembly tool with automatic limiting function comprises a base 1, a center column 2 is fixedly connected to the middle part of the base 1, a steel ring limiting mechanism 3 is connected to the outer peripheral side of the center column 2, the steel ring limiting mechanism 3 comprises a support arm 4, a sliding block 5, a spring tube 6 and an air pump 9, one end of a plurality of support arms 4 is fixedly connected to the outer peripheral side of the center column 2, and the other end is fixedly connected to the base 1, a plurality of sliding blocks 5 are slidably connected to the support arm 4, wherein steel rings of different diameters are placed on the support arm 4 between the plurality of sliding blocks 5, a sliding groove 41 is opened on the support arm 4, the sliding groove 41 is through-set at one end away from the center column 2, a fixing cap is clamped at one end of the sliding groove 41 away from the center column 2, and a plurality of sliding blocks 5 are slidably connected in the sliding groove 41. When a large number of steel rings need to be welded, the fixing cap can be removed and more sliding blocks 5 can be placed in the sliding groove 41 to adapt to fan covers with different numbers of steel rings.

[0026] A connecting tube 51 is fixedly connected inside the sliding block 5 , and both ends of two adjacent connecting tubes 51 are connected to the same spring tube 6 . A separation spring is arranged inside the spring tube 6 to ensure the elasticity of the spring tube 6 .

[0027] An exhaust pipe 53 is connected to the middle of the connecting pipe 51. The exhaust pipe 53 adopts a three-way pipe. The end of the exhaust pipe 53 away from the connecting pipe 51 is connected to the outside and points to the steel ring to be welded. An electromagnetic valve 52 is installed in the connection between the connecting pipe 51 and the exhaust pipe 53. The electromagnetic valve 52 adopts a two-position three-way valve. In the initial state of the electromagnetic valve 52, the end of the connecting pipe 51 close to the center column 2 is connected to the exhaust pipe 53 and blocks the connection between the two ends of the connecting pipe 51. In the working state, the two ends of the connecting pipe 51 are connected and the connection between the connecting pipe 51 and the exhaust pipe 53 is closed. Therefore, in the initial state of the electromagnetic valve 52, the airflow entering the input end of the connecting pipe 51 is blown to the adjacent welding points on both sides through the exhaust pipe 53. On the one hand, the airflow rushing into the connecting pipe 51 forms a pushing force on the sliding block 5 through the connecting pipe 51, and on the other hand, the blown airflow can accelerate the cooling of the welding point; when the electromagnetic valve 52 is in the working state, the airflow entering the input end of the connecting pipe 51 directly passes through the connecting pipe 51 into the next spring tube 6, so as to facilitate the work of the next spring tube 6.

[0028] The air pump 9 is installed on the base 1, and the output end of the air pump 9 is connected to an output pipe 91. The end of the output pipe 91 away from the air pump 9 is connected to multiple connecting pipes 51 close to the center column 2 through the spring tube 6. When the air pump 9 is working, the output end of the air pump 9 outputs airflow into the spring tube 6 through the output pipe 91, and the sliding block 5 moves by the pushing force of the airflow.

[0029] The top of the sliding block 5 protrudes from the support arm 4, and a frame groove is opened through the side away from the center column 2. A rotating frame 7 is connected to the frame groove for axial sliding along the support arm 4. A rotating roller 8 is rotatably connected to the rotating frame 7. The rotating roller 8 rests on the inner circumference of the steel ring away from the frame groove. When the sliding block 5 moves, multiple rotating rollers 8 subjected to the same force rest on the inner circumference of the steel ring, thereby keeping the steel ring concentric with the center column 2. Finally, it is convenient for multiple steel rings to remain concentric with the center column 2, thereby improving the welding quality.

[0030] The rotating roller 8 is in a truncated cone shape, wherein the truncated cone-shaped rotating roller 8 is invertedly connected in the rotating frame 7. When the rotating roller 8 abuts against the steel ring, it is beneficial to form a downward squeezing force on the steel ring, thereby forming a fixing effect on the steel ring.

[0031] A piezoelectric sheet is installed between the rotating frame 7 and the inner wall of the frame groove. Multiple piezoelectric sheets are electrically connected to the controller. Multiple piezoelectric sheets correspond one-to-one to multiple solenoid valves 52. A controller is installed on the base 1. The controller is electrically connected to the air pump 9, multiple solenoid valves 52 and external welding equipment.

[0032] When the controller is working, it receives piezoelectric signals from multiple piezoelectric sheets at the same diameter position with the central column 2 as the center, and sends a welding indication signal to the external welding equipment, then receives a welding completion signal from the external welding equipment, and controls the operation of multiple solenoid valves 52 corresponding to these multiple piezoelectric sheets.

[0033] refer to Figure 1 and Figure 5 A plurality of snap-in grooves 21 are provided on the outer peripheral side of the center column 2, and a steel bar fixing mechanism 10 is fixedly connected to the base 1, and the plurality of steel bar fixing mechanisms 10 correspond one to one to the plurality of snap-in grooves 21. A fixing component 17 is connected to the output end of the steel bar fixing mechanism 10 and the snap-in groove 21, wherein both ends of the steel bar are connected to the output ends of the two fixing components 17, wherein the steel bar fixing mechanism 10 is used to form a radial extrusion force on the steel bar pointing to the center column 2, and the steel bar is suspended and fixed in the two fixing components 17, which effectively avoids the welding point being located directly above the steel bar fixing mechanism 10, and avoids the welding slag generated by welding falling on the steel bar fixing mechanism 10 and damaging the steel bar fixing mechanism 10.

[0034] The steel bar fixing mechanism 10 includes an edge column 11, a vertical slider 12, a support spring 13, a horizontal rod 14, a rotating rod 15 and a clamping frame 16. The plurality of edge columns 11 correspond to the plurality of clamping grooves 21 one by one and are fixedly connected to the base 1. A vertical sliding groove is provided in the middle of the edge column 11 along the vertical direction. The vertical slider 12 is slidably connected in the vertical sliding groove. A support spring 13 is fixedly connected between the bottom end of the vertical slider 12 and the bottom of the vertical sliding groove. The top of the edge column 11 is slidably connected to the horizontal rod 14 along the radial direction of the center column 2. The vertical sliding groove is arranged to penetrate the side close to the center column 2. The vertical slider 12 is rotatably connected to the rotating rod on the side close to the center column 2. 15, the end of the rotating rod 15 away from the vertical sliding block 12 passes through the vertical sliding groove and is rotatably connected with the end of the horizontal rod 14 close to the center column 2. The end of the horizontal rod 14 close to the center column 2 is fixedly connected with a clamping frame 16, and a fixing component 17 is connected in the clamping frame 16. After one end of the steel bar is inserted into the fixing component 17 of the clamping frame 16, when the horizontal bar 14 is pushed outward, the horizontal bar 14 drives the rotating rod 15 to rotate, and the rotating rod 15 pushes the vertical sliding block 12 to move downward, overcoming the supporting spring 13, until the other end of the steel bar is inserted into the fixing component 17 in the clamping groove 21, the supporting spring 13 pushes the vertical sliding block 12 to move upward, forming a fixing effect on the steel bar.

[0035] The fixing assembly 17 includes a fixing frame 171, a fixing block 172 and a fixing spring 173. The fixing frame 171 is clamped in the clamping groove 21 and the clamping frame 16, wherein the two fixing frames 171 located in the clamping groove 21 and the clamping frame 16 are open on opposite sides, and the fixing block 172 is slidably connected in the fixing frame 171 along the vertical direction, and the fixing spring 173 is fixedly connected between the bottom of the fixing block 172 and the bottom of the fixing frame 171, and the top of the fixing frame 171 is flush with the upper surface of the support arm 4 to ensure the contact between the steel bar and the steel ring, wherein the tops of the opposite sides of the two corresponding fixing blocks 172 are wedge-shaped openings, which facilitates the insertion of the two ends of the steel bar along the wedge-shaped opening between the top of the fixing block 172 and the fixing frame 171.

[0036] When welding the fan cover, insert one end of the steel bar into the output end of the fixing component 17 in the clamping groove 21 on the center column 2, and insert the other end into the output end of the fixing component 17 connected to the corresponding edge column 11 to complete the fixing of the steel bar;

[0037] Then, a plurality of steel rings of different diameters are placed between two adjacent groups of sliding blocks 5 of the same diameter on the support arm 4. At this time, the air pump 9 is started, and the output end of the air pump 9 inflates the connecting tube 51 in the plurality of sliding blocks 5 through the output tube 91 and the spring tube 6. Since the electromagnetic valve 52 in the connecting tube 51 initially blocks the passage of the connecting tube 51, under the driving action of the air flow output by the air pump 9, the spring tube 6 and the separating spring inside it are stretched, so that the sliding block 5 corresponding to the connecting tube 51 slides along the sliding groove 41 in the direction away from the central column 2, thereby making the rotating roller 8 on the plurality of sliding blocks 5 of the same diameter abut against the inner peripheral side of the steel ring with the smallest diameter. Under the abutting action of the plurality of sliding blocks 5 subjected to the same force, the steel ring and the central column 2 remain in a concentric state. When the extrusion force on the piezoelectric sheet reaches a predetermined value, the controller receives the piezoelectric signal of the piezoelectric sheet, and sends a welding indication signal to the external welding equipment, so that the external welding equipment can weld the welding points of the steel ring and the plurality of steel bars.

[0038] During the welding process, the airflow output by the air pump 9 pushes the sliding block 5 to move, and at the same time, blows toward the adjacent welding points on both sides through the exhaust pipe 53 on the connecting pipe 51, thereby accelerating the cooling speed of the welding points and improving the efficiency of the entire welding;

[0039] After welding is completed, the controller receives a welding completion signal from an external welding device, and controls the operation of multiple solenoid valves 52 corresponding to the multiple piezoelectric sheets. When the solenoid valves 52 are working, the solenoid valves 52 connect the two ends of the connecting tube 51 and seal the connecting tube 51 from the exhaust pipe 53. The airflow output by the air pump 9 directly passes through the connecting tube 51 to the next connecting tube 51, causing the next group of sliding blocks 5 with the same diameter to start sliding, thereby completing the re-limiting and fixing of the steel rings of the corresponding diameters, ensuring the concentricity of the steel rings with the center column 2 and the fixing effect of the steel rings, and then performing the welding operation until the welding of steel rings of all diameters with multiple steel bars is completed, and the welding operation of the fan cover is completed.

[0040] In the present invention, by setting the steel ring limiting mechanism 3, it is beneficial for the power output by the air pump 9 to cooperate with the piezoelectric sheet and the electromagnetic valve 52 to control the movement of multiple sliding blocks 5 one by one, so that multiple steel rings can be automatically concentrically limited and fixed from a small diameter to a large diameter single steel ring, which is convenient for welding the steel ring and the steel bar. Compared with the traditional method of using bolts to manually lock the limit block to limit the steel ring, the limiting speed of steel rings with different diameters can be greatly improved, thereby improving the welding speed of the fan cover;

[0041] In the present invention, by providing a two-position three-way electromagnetic valve 52, during the welding operation, the air flow output by the air pump 9 passes through the front half of the connecting pipe 51 and the two output ends of the exhaust pipe 53 and blows toward two adjacent welding points, thereby accelerating the cooling speed of the welding points and further improving the welding efficiency.

[0042] In the present invention, by setting up the steel bar fixing mechanism 10, the horizontal rod 14 moves on the top of the edge column 11, thereby driving the fixing component 17 thereon to move, and then the distance between the output end of the steel bar fixing mechanism 10 and the fixing component 17 on the clamping groove 21 can be controlled, so as to facilitate the fixing of steel bars of different lengths and improve the welding adaptability to fan covers of different specifications. At the same time, the steel bar fixing mechanism 10 is located at the end of the steel bar, not directly below the steel bar, which effectively prevents the welding slag generated by welding from falling onto the steel bar fixing mechanism 10.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fan cover top assembly tool capable of automatically limiting position, comprising a base (1), characterized in that: The base (1) is fixedly connected to a central column (2) in the middle, and a steel ring limiting mechanism (3) is connected to the outer peripheral side of the central column (2). The steel ring limiting mechanism (3) comprises a support arm (4), a sliding block (5), a spring tube (6) and an air pump (9). One end of a plurality of the support arms (4) is fixedly connected to the outer peripheral side of the central column (2), and the other end is fixedly connected to the base (1). A plurality of sliding blocks (5) are slidably connected to the support arm (4), wherein steel rings of different diameters are placed on the support arm (4) between the plurality of sliding blocks (5). A connecting pipe (51) is fixedly connected inside the sliding block (5), and both ends of two adjacent connecting pipes (51) are connected to the same spring tube (6). An exhaust pipe (53) is connected to the middle of the connecting pipe (51), and the exhaust pipe (53) adopts a three-way pipe. The exhaust pipe (53) is connected to the outside at one end away from the connecting pipe (51) and points to the steel ring to be cooled. A solenoid valve (52) is installed in the connection between the connecting pipe (51) and the exhaust pipe (53), the air pump (9) is installed on the base (1), the output end of the air pump (9) is connected to an output pipe (91), the end of the output pipe (91) away from the air pump (9) is connected to multiple connecting pipes (51) close to the center column (2) through a spring tube (6), the outer peripheral side of the center column (2) is provided with multiple clamping grooves (21), a steel bar fixing mechanism (10) is fixedly connected to the base (1), the multiple steel bar fixing mechanisms (10) correspond to the multiple clamping grooves (21) one by one, the output end of the steel bar fixing mechanism (10) and the clamping groove (21) are both connected to a fixing component (17), wherein the two ends of the steel bar are connected to the output ends of the two fixing components (17), wherein the steel bar fixing mechanism (10) is used to form a radial extrusion force on the steel bar pointing to the center column (2).

2. The automatically position-limited fan cover top assembly tool according to claim 1, characterized in that: The support arm (4) is provided with a sliding groove (41), the sliding groove (41) is arranged to penetrate the end away from the central column (2), the sliding groove (41) is clamped with a fixing cap at the end away from the central column (2), and the plurality of sliding blocks (5) are slidably connected in the sliding groove (41).

3. The automatically position-limited fan cover top assembly tool according to claim 1, characterized in that: The solenoid valve (52) is a two-position three-way valve, wherein in the initial state of the solenoid valve (52), one end of the connecting pipe (51) close to the central column (2) is connected to the exhaust pipe (53) and the connection between the two ends of the connecting pipe (51) is blocked; in the working state, the two ends of the connecting pipe (51) are connected and the connection between the connecting pipe (51) and the exhaust pipe (53) is blocked.

4. The automatically position-limited fan cover top assembly tool according to claim 1, characterized in that: The top of the sliding block (5) protrudes from the support arm (4), and a frame groove is provided on the side away from the center column (2). A rotating frame (7) is slidably connected to the support arm (4) in the frame groove. A rotating roller (8) is rotatably connected to the rotating frame (7). The rotating roller (8) abuts against the inner circumference of the steel ring on the side away from the frame groove. A piezoelectric sheet is installed between the rotating frame (7) and the inner wall of the frame groove. Multiple piezoelectric sheets are electrically connected to a controller. Multiple piezoelectric sheets correspond to multiple solenoid valves (52) one by one. A controller is installed on the base (1). The controller is electrically connected to an air pump (9), multiple solenoid valves (52) and external welding equipment.

5. The fan cover top assembly tool capable of automatically limiting position according to claim 4, characterized in that: When the controller is in operation, it receives piezoelectric signals from a plurality of piezoelectric sheets at positions with the same diameter as the center of the central column (2), and sends a welding indication signal to an external welding device, then receives a welding completion signal from the external welding device, and controls the operation of a plurality of solenoid valves (52) corresponding to the plurality of piezoelectric sheets.

6. The automatically position-limited fan cover top assembly tool according to claim 4, characterized in that: The rotating roller (8) is in the shape of a truncated cone, wherein the truncated cone-shaped rotating roller (8) is invertedly connected in the rotating frame (7).

7. The automatically position-limited fan cover top assembly tool according to claim 1, characterized in that: The steel bar fixing mechanism (10) comprises an edge column (11), a vertical slider (12), a support spring (13), a horizontal rod (14), a rotating rod (15) and a clamping frame (16); a plurality of the edge columns (11) correspond to a plurality of clamping grooves (21) one by one and are fixedly connected to the base (1); a vertical sliding groove is provided in the middle of the edge column (11) along the vertical direction, a vertical slider (12) is slidably connected in the vertical sliding groove, a support spring (13) is fixedly connected between the bottom end of the vertical slider (12) and the bottom of the vertical sliding groove, and the edge column (11) is provided with a plurality of clamping grooves (21) in a fixed manner. 1) A horizontal rod (14) is slidably connected to the top along the radial direction of the central column (2), wherein a vertical slide groove is arranged through the side close to the central column (2), and a rotating rod (15) is rotatably connected to the side of the vertical slider (12) close to the central column (2), and the end of the rotating rod (15) away from the vertical slider (12) passes through the vertical slide groove and is rotatably connected to the end of the horizontal rod (14) close to the central column (2), and a clamping frame (16) is fixedly connected to the end of the horizontal rod (14) close to the central column (2), and a fixing component (17) is connected inside the clamping frame (16).

8. The automatically position-limited fan cover top assembly tool according to claim 7, characterized in that: The fixing assembly (17) comprises a fixing frame (171), a fixing block (172) and a fixing spring (173); the fixing frame (171) is clamped in the clamping groove (21) and the clamping frame (16); the two fixing frames (171) located in the clamping groove (21) and the clamping frame (16) are arranged on opposite sides in an open manner; a fixing block (172) is slidably connected in the fixing frame (171) along a vertical direction; a fixing spring (173) is fixedly connected between the bottom of the fixing block (172) and the bottom of the fixing frame (171); and the top of the fixing frame (171) is flush with the upper surface of the support arm (4).

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