Fan cover top assembly tool capable of automatic limiting

Abstract

The application relates to a fan cover machining device technical field, in particular to a fan cover top assembling tool capable of automatic limiting, which comprises a base, a center column fixedly connected to the middle of the base, a steel ring limiting mechanism connected to the outer periphery of the center column, the steel ring limiting mechanism comprising supporting arms, sliding blocks, spring tubes and air pumps, one end of the supporting arms is fixedly connected to the outer periphery of the center column, and the other end is fixedly connected to the base, and the supporting arms are slidably connected with the sliding blocks, in the application, the steel ring limiting mechanism is arranged, the power output by the air pump is matched with the piezoelectric sheet and the electromagnetic valve to sequentially control the movement of the sliding blocks, so that the automatic concentric limiting and fixing of the steel rings from small diameters to large diameters can be realized, the steel rings and the steel strips can be conveniently welded, the limiting speed of the steel rings with different diameters can be greatly improved, and the welding speed of the fan cover is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fan cover processing device, and particularly relates to a fan cover top assembly tool capable of automatic limiting. BACKGROUND

[0002] The existing fan cover top is generally composed of multiple concentric steel rings and steel bars for fixing the multiple steel rings by welding. Compared with punching on a plate, this structure is more material-saving and effectively reduces the processing cost. When welding the fan cover composed of multiple steel rings and steel bars, a processing tool is generally used to place the steel rings and steel bars. The traditional fan cover tool generally determines the position of the steel rings and steel bars by providing a limiting groove for the entire fan cover to be inserted into. This way has low adaptability to different specifications of fan covers and cannot complete the welding operation of fan covers of different specifications.

[0003] In the prior art, a movable limiting block is used to lock the limiting block by rotating a bolt, so as to move the limiting block to the corresponding position to limit the steel rings of different diameters. However, this way needs to adjust the position of the limiting block when welding fan covers of different specifications, which is troublesome. Moreover, it cannot automatically limit the steel rings of different diameters, reduces the welding efficiency, and has high requirements for the placement of the steel rings, which needs to accurately place the steel rings on the same side of the multiple limiting blocks of the same diameter, thereby increasing the work load of the workers. SUMMARY

[0004] The present application provides a fan cover top assembly tool capable of automatic limiting, which aims to solve the problem that the traditional technology cannot complete the welding operation of fan covers of different specifications by determining the position of the steel rings and steel bars through the limiting groove for the entire fan cover to be inserted into.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] An automatic limiting fan cover top assembly tool, comprising a base, a center column is fixedly connected in the middle of the base, a steel ring limiting mechanism is connected on the outer periphery of the center column, the steel ring limiting mechanism comprises a support arm, a sliding block, a spring pipe and a gas pump, a plurality of support arms are fixedly connected at one end of the outer periphery of the center column, and the other end is fixedly connected on the base, a plurality of sliding blocks are slidingly connected on the support arm, wherein different diameter steel rings are placed on the support arm between a plurality of sliding blocks, a communication pipe is fixedly connected in the sliding block, the two ends of the adjacent two communication pipes are communicated with the same spring pipe, the communication pipe is communicated with an exhaust pipe in the middle, the exhaust pipe adopts a three-way pipe, the end of the exhaust pipe away from the communication pipe is communicated with the outside and points to the steel ring to be welded, an electromagnetic valve is installed in the connection between the communication pipe and the exhaust pipe, the gas pump is installed on the base, the output end of the gas pump is communicated with an output pipe, the end of the output pipe away from the gas pump is communicated with a plurality of communication pipes close to the center column through the spring pipe, a plurality of clamping grooves are formed on the outer periphery of the center column, a steel bar fixing mechanism is fixedly connected on the base, a plurality of steel bar fixing mechanisms correspond to a plurality of clamping grooves one by one, and a fixing assembly is connected on the output end of the steel bar fixing mechanism and the clamping groove, wherein the two ends of the steel bar are connected in the two output ends of the fixing assembly, and the steel bar fixing mechanism is used for forming a radial extrusion force of the steel bar to the center column.

[0007] Preferably, a sliding groove is formed on the support arm, the end of the sliding groove away from the center column is provided in a penetrating manner, a fixed cap is clamped at the end of the sliding groove away from the center column, and a plurality of sliding blocks are slidingly connected in the sliding groove, so that different numbers of sliding blocks are conveniently installed, and the fan cover of different numbers of steel rings is adapted.

[0008] Preferably, the electromagnetic valve adopts a two-position three-way valve, wherein when the electromagnetic valve is in an initial state, the end of the communication pipe close to the center column is communicated with the exhaust pipe and blocks the communication of the two ends of the communication pipe, so that the gas flow on one hand forms a pushing force on the sliding block through the communication pipe, and on the other hand, the blown gas flow can accelerate the cooling of the welding point; when the electromagnetic valve is in a working state, the two ends of the communication pipe are communicated and the communication between the communication pipe and the exhaust pipe is blocked, so that the gas flow has the same driving effect on the communication pipe on the next sliding block.

[0009] Preferably, the top end of the sliding block protrudes from the support arm, and a frame groove is formed in the side away from the center column in a penetrating manner, a rotating frame is slidingly connected in the frame groove along the axial direction of the support arm, a rotating roller is rotatably connected in the rotating frame, the side of the rotating roller away from the frame groove abuts against the inner periphery of the steel ring, piezoelectric sheets are installed between the rotating frame and the inner wall of the frame groove, a plurality of piezoelectric sheets are electrically connected with a controller, a plurality of piezoelectric sheets correspond to a plurality of electromagnetic valves one by one, and the controller is installed on the base and is electrically connected with the gas pump, the plurality of electromagnetic valves and an external welding device.

[0010] Preferably, the controller receives piezoelectric signals of the plurality of piezoelectric sheets in the same-diameter position with the center column as the center when working, and sends a weldable indication signal to the external welding device, then receives a welding completion signal sent by the external welding device, and controls the plurality of electromagnetic valves corresponding to the plurality of piezoelectric sheets to work.

[0011] Preferably, the rotating roller is in the shape of a circular truncated cone, and the circular truncated cone-shaped rotating roller is connected in an inverted manner in the rotating frame, and forms a downward extrusion component force on the steel ring when the rotating roller abuts against the steel ring, thereby forming a fixing effect on the steel ring.

[0012] Preferably, the steel bar fixing mechanism comprises edge columns, vertical sliding blocks, supporting springs, horizontal rods, rotating rods and clamping frames, a plurality of the edge columns are in one-to-one correspondence with a plurality of clamping grooves and are fixedly connected to the base, a vertical sliding groove is formed in the middle of the edge column in the vertical direction, the vertical sliding groove is slidably connected with a vertical sliding block, a supporting spring is fixedly connected between the bottom end of the vertical sliding block and the inner bottom of the vertical sliding groove, a horizontal rod is slidably connected to the top of the edge column in the radial direction of the center column, the vertical sliding groove is provided in a penetrating manner on the side close to the center column, the vertical sliding block is rotatably connected with a rotating rod on the side close to the center column, the rotating rod penetrates through the vertical sliding groove and is rotatably connected with the end of the horizontal rod close to the center column, and the end of the horizontal rod close to the center column is fixedly connected with a clamping frame, and the clamping frame is connected with a fixing assembly, so that the steel bar in the fixing assembly in the clamping frame and the clamping groove is extruded and fixed by the elastic force of the supporting spring, the steel bar of different lengths is conveniently fixed, and the welding adaptability to different specifications of fan covers is improved.

[0013] Preferably, the fixing assembly comprises fixing frames, fixing blocks and fixing springs, the two fixing frames located in the clamping groove and the clamping frame are provided in an open manner on the opposite side, the fixing block is slidably connected in the vertical direction in the fixing frame, and the fixing spring is fixedly connected between the bottom of the fixing block and the inner bottom of the fixing frame, and the top of the fixing frame is flush with the upper surface of the supporting arm, so that the contact between the steel bar and the steel ring is ensured.

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

[0015] 1、In the present application, the steel ring limiting mechanism is arranged, the power output by the air pump cooperates with the piezoelectric sheet and the electromagnetic valve to control the movement of the plurality of sliding blocks in sequence, so that the plurality of steel rings can be automatically concentrically limited and fixed from a small diameter to a large diameter, the welding of the steel ring and the steel bar is facilitated, the limiting speed of the steel ring of different diameters can be greatly improved, and the welding speed of the fan cover is improved.

[0016] 2、The present application, by setting two-position three-way electromagnetic valve, when welding operation, the gas flow output by the gas pump through the front half of the communication pipe and the two output ends of the exhaust pipe, blow to the adjacent two welding points, so as to accelerate the cooling speed of the welding point, further improve the welding efficiency.

[0017] 3、The present application, by setting steel bar fixing mechanism, convenient to fix different length of steel bar, improve the welding adaptability of different specifications of fan cover, at the same time, the steel bar fixing mechanism is located at the end of the steel bar, not directly below the steel bar, effectively avoid the welding slag falling on the steel bar fixing mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the structural schematic diagram of the present application;

[0019] Figure 2 is Figure 1 the enlarged schematic diagram of part A;

[0020] Figure 3 is the schematic diagram of the communication pipe and spring pipe of the present application;

[0021] Figure 4 is the position schematic diagram of the gas pump and output pipe of the present application;

[0022] Figure 5 is the sectional view schematic diagram of the steel bar fixing mechanism of the present application.

[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 communication pipe, 52 electromagnetic valve, 53 exhaust pipe, 6 spring pipe, 7 rotating frame, 8 rotating roller, 9 gas pump, 91 output pipe, 10 steel bar fixing mechanism, 11 edge column, 12 vertical sliding block, 13 support 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 application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0025] Reference Figures 1-4The application discloses an automatic limiting fan cover top assembling tool, which comprises a base 1, a center column 2 fixedly connected to the middle part of the base 1, a steel ring limiting mechanism 3 connected to the outer circumferential side of the center column 2, a plurality of supporting arms 4, a plurality of sliding blocks 5, a plurality of spring pipes 6 and a gas pump 9.

[0026] The sliding block 5 is fixedly connected with a communication pipe 51, the two ends of the adjacent two communication pipes 51 are communicated with the same spring pipe 6, and the spring pipe 6 is provided with a separation spring, so that the elasticity of the spring pipe 6 is ensured.

[0027] The communication pipe 51 is communicated with an exhaust pipe 53 in the middle part, the exhaust pipe 53 is a three-way pipe, one end of the exhaust pipe 53 away from the communication pipe 51 is communicated with the outside and points to a steel ring to be welded, an electromagnetic valve 52 is installed in the connection part of the communication pipe 51 and the exhaust pipe 53, the electromagnetic valve 52 is a two-position three-way valve, in the initial state of the electromagnetic valve 52, the end of the communication pipe 51 close to the center column 2 is communicated with the exhaust pipe 53 and blocks the communication of the two ends of the communication pipe 51, and in the working state, the two ends of the communication pipe 51 are communicated and the communication of the communication pipe 51 and the exhaust pipe 53 is blocked, so that in the initial state of the electromagnetic valve 52, the airflow input into the input end of the communication pipe 51 is blown to the two adjacent welding points through the exhaust pipe 53, the airflow flowing into the communication pipe 51 forms a pushing force on the sliding block 5 through the communication pipe 51, and the blown airflow can accelerate the cooling of the welding point; in the working state of the electromagnetic valve 52, the airflow input into the input end of the communication pipe 51 directly enters the next spring pipe 6 through the communication pipe 51, so that the next spring pipe 6 can work conveniently.

[0028] The gas pump 9 is installed on the base 1, the output end of the gas pump 9 is communicated with an output pipe 91, one end of the output pipe 91 away from the gas pump 9 is communicated with the plurality of communication pipes 51 close to the center column 2 through the spring pipes 6, when the gas pump 9 works, the output end of the gas pump 9 outputs the airflow into the spring pipes 6 through the output pipe 91, and the sliding blocks 5 are moved through the pushing force of the airflow.

[0029] The sliding block 5 protrudes the support arm 4 at the top end, and a frame slot is formed through the side away from the central column 2. A rotating frame 7 is axially slidably connected in the frame slot along the support arm 4. A rotating roller 8 is rotatably connected in the rotating frame 7. The rotating roller 8 abuts against the inner circumferential side of the steel ring on the side away from the frame slot. When the sliding block 5 moves, the rotating roller 8 abuts against the inner circumferential side of the steel ring under the same force, so as to keep the steel ring concentric with the central column 2, and finally facilitate the concentricity between the steel ring and the central column 2, and improve the welding quality.

[0030] The rotating roller 8 is in the shape of a circular truncated cone. The circular truncated cone-shaped rotating roller 8 is connected in the rotating frame 7 in an inverted manner. When the rotating roller 8 abuts against the steel ring, it is beneficial to form a downward extrusion component force on the steel ring, and is beneficial to form a fixing effect on the steel ring.

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

[0032] When the controller works, it receives piezoelectric signals of the plurality of piezoelectric sheets at the same position with the central column 2 as the center, and sends a weldable indication signal to the external welding equipment. Then, the controller receives a welding completion signal sent by the external welding equipment, and controls the plurality of electromagnetic valves 52 corresponding to the plurality of piezoelectric sheets to work.

[0033] Reference Figure 1 And Figure 5 A plurality of clamping grooves 21 are formed on the outer circumferential side of the central column 2. A steel bar fixing mechanism 10 is fixedly connected to the base 1. The plurality of steel bar fixing mechanisms 10 correspond one-to-one to the plurality of clamping grooves 21. A fixed assembly 17 is connected to the output end of the steel bar fixing mechanism 10 and the clamping groove 21. The two ends of the steel bar are connected to the output ends of the two fixed assemblies 17. The steel bar fixing mechanism 10 is used to form a radial extrusion force on the steel bar directed to the central column 2. The steel bar is suspended and fixed in the two fixed assemblies 17, effectively avoiding that the welding point is located directly above the steel bar fixing mechanism 10, and avoiding that the welding slag falls on the steel bar fixing mechanism 10 to damage the steel bar fixing mechanism 10.

[0034] The steel bar fixing mechanism 10 comprises edge columns 11, vertical sliding blocks 12, supporting springs 13, horizontal rods 14, rotating rods 15 and clamping frames 16, a plurality of 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 formed in the middle of the edge column 11 in the vertical direction, the vertical sliding groove is slidably connected with the vertical sliding block 12, the supporting spring 13 is fixedly connected between the bottom end of the vertical sliding block 12 and the bottom of the vertical sliding groove, the horizontal rod 14 is slidably connected to the top of the edge column 11 in the radial direction of the central column 2, the vertical sliding groove is provided in a penetrating manner on the side close to the central column 2, the rotating rod 15 is rotatably connected to the side of the vertical sliding block 12 close to the central column 2, the end of the rotating rod 15 away from the vertical sliding block 12 penetrates through the vertical sliding groove and is rotatably connected to the end of the horizontal rod 14 close to the central column 2, the clamping frame 16 is fixedly connected to the end of the horizontal rod 14 close to the central column 2, the fixing assembly 17 is connected in the clamping frame 16, when the horizontal rod 14 is pushed outwards after the one end of the steel bar is inserted into the fixing assembly 17 of the clamping frame 16, the horizontal rod 14 drives the rotating rod 15 to rotate, the rotating rod 15 drives the vertical sliding block 12 to move downwards and overcome the supporting spring 13, until the other end of the steel bar is inserted into the fixing assembly 17 in the clamping groove 21, the supporting spring 13 drives the vertical sliding block 12 to move upwards, thereby forming a fixing effect on the steel bar.

[0035] The fixing assembly 17 comprises fixing frames 171, fixing blocks 172 and fixing springs 173, the fixing frame 171 is clamped in the clamping groove 21 and the clamping frame 16, the opposite side of the two fixing frames 171 in the clamping groove 21 and the clamping frame 16 is provided in an open manner, the fixing block 172 is slidably connected in the fixing frame 171 in the vertical direction, the fixing spring 173 is fixedly connected between the bottom of the fixing block 172 and the bottom of the fixing frame 171, the top of the fixing frame 171 is flush with the upper surface of the supporting arm 4, thereby ensuring the contact between the steel bar and the steel ring, the top of the opposite side of the two corresponding fixing blocks 172 is provided in a wedge-shaped opening, thereby facilitating the insertion of the two ends of the steel bar into the fixing block 172 and between the fixing frame 171.

[0036] When welding the fan cover, the one end of the steel bar is inserted into the output end of the fixing assembly 17 in the clamping groove 21 on the central column 2, and the other end is inserted into the output end of the fixing assembly 17 connected to the corresponding edge column 11, thereby completing the fixing of the steel bar.

[0037] The multiple steel rings of different diameters are placed between two groups of sliding blocks 5 of the same diameter on the supporting arm 4, at this time, the air pump 9 is started, the output end of the air pump 9 is communicated with the communication pipe 51 in the multiple sliding blocks 5 through the output pipe 91 and the spring pipe 6, due to the initial state of the electromagnetic valve 52 in the communication pipe 51, the communication pipe 51 is blocked, under the pushing action of the air flow output by the air pump 9, the spring pipe 6 and the separation spring inside are stretched, so that the sliding block 5 corresponding to the communication pipe 51 slides along the sliding groove 41 to the direction away from the center column 2, and then the rotating roller 8 on the multiple sliding blocks 5 of the same diameter abuts on the inner circumferential side of the steel ring with the smallest diameter, under the abutting action of the multiple sliding blocks 5 subjected to the same force, the steel ring and the center column 2 are kept in the concentric state, when the extrusion force of the piezoelectric sheet reaches the predetermined value, the controller receives the piezoelectric signal of the piezoelectric sheet, and sends a weldable signal to the external welding equipment, and the external welding equipment can weld the welding points of the steel ring and the multiple steel bars;

[0038] During the welding process, the air flow output by the air pump 9 pushes the sliding block 5 to move at the same time, and blows to the two adjacent welding points through the exhaust pipe 53 on the communication pipe 51, so that the cooling speed of the welding point can be accelerated, and the efficiency of the whole welding can be improved;

[0039] After the welding is completed, the controller receives the welding completion signal sent by the external welding equipment, and controls the multiple electromagnetic valves 52 corresponding to the multiple piezoelectric sheets to work, when the electromagnetic valve 52 works, the electromagnetic valve 52 makes the two ends of the communication pipe 51 communicated and closed, and blocks the communication between the communication pipe 51 and the exhaust pipe 53, the air flow output by the air pump 9 directly flows through the communication pipe 51 to the next communication pipe 51, so that the next group of sliding blocks 5 of the same diameter starts to slide, and the repositioning and fixing of the steel ring of the corresponding diameter are completed, the concentricity of the steel ring and the center column 2 is ensured, and the fixing effect of the steel ring is ensured, and then the welding operation is carried out, until the welding of the steel ring and the multiple steel bars of all diameters is completed, and the welding operation of the fan cover is completed.

[0040] In the application, by arranging the steel ring limiting mechanism 3, the power output by the air pump 9 can cooperate with the piezoelectric sheet and the electromagnetic valve 52 to control the movement of the multiple sliding blocks 5 one by one, so that the multiple steel rings can be automatically concentrically positioned and fixed from small diameter to large diameter, and the welding of the steel ring and the steel bar is facilitated, compared with the traditional way of using bolts to manually lock the limiting block to position the steel ring, the positioning speed of the steel ring of different diameters can be greatly improved, and then the welding speed of the fan cover is improved;

[0041] In the application, by arranging the two-position three-way electromagnetic valve 52, when the welding operation is carried out, the air flow output by the air pump 9 blows to the adjacent two welding points through the front half of the communication pipe 51 and the two output ends of the exhaust pipe 53, so that the cooling speed of the welding point can be accelerated, and the welding efficiency can be further improved;

[0042] In the application, the horizontal rod 14 moves on the top of the edge column 11, drives the fixed assembly 17 on it to move, and then the distance between the output end of the steel bar fixing mechanism 10 and the fixed assembly 17 on the clamping groove 21 can be controlled, so that the steel bars with different lengths can be fixed conveniently, the welding adaptability to the fan covers with different specifications is improved, and meanwhile, the steel bar fixing mechanism 10 is located at the end of the steel bar and not directly below the steel bar, so that the welding slag generated by welding can be effectively avoided from falling on the steel bar fixing mechanism 10.

Claims

1. An automatic position-limiting fan cover top assembly tool, comprising a base (1), characterized in that, The middle of the base (1) is fixedly connected with a center column (2), the outer peripheral side of the center column (2) is connected with a steel ring limiting mechanism (3), the steel ring limiting mechanism (3) comprises a supporting arm (4), a sliding block (5), a spring pipe (6) and a gas pump (9), a plurality of the supporting arms (4) are fixedly connected at one end to the outer peripheral side of the center column (2) and fixedly connected at the other end to the base (1), a plurality of the sliding blocks (5) are slidably connected to the supporting arms (4), wherein different diameter steel rings are placed on the supporting arms (4) between the plurality of sliding blocks (5), the sliding blocks (5) are fixedly connected with a communication pipe (51) inside, the two ends of adjacent two communication pipes (51) are communicated with the same spring pipe (6), the communication pipe (51) is communicated with an exhaust pipe (53) in the middle, the exhaust pipe (53) is a three-way pipe, the end of the exhaust pipe (53) away from the communication pipe (51) is communicated with the outside and points to the steel ring to be welded, an electromagnetic valve (52) is installed in the communication pipe (51) and the exhaust pipe (53) connection, the gas pump (9) is installed on the base (1), the output end of the gas pump (9) is communicated with an output pipe (91), the end of the output pipe (91) away from the gas pump (9) is communicated with a plurality of communication pipes (51) close to the center column (2) through the spring pipe (6), a plurality of clamping grooves (21) are formed in the outer peripheral side of the center column (2), a steel bar fixing mechanism (10) is fixedly connected to the base (1), a plurality of the steel bar fixing mechanisms (10) correspond to a plurality of the clamping grooves (21) one by one, the output end of the steel bar fixing mechanism (10) and the clamping groove (21) are both connected with a fixing assembly (17), wherein the two ends of the steel bar are connected to the output ends of the two fixing assemblies (17), wherein the steel bar fixing mechanism (10) is used for forming a radial extrusion force of the steel bar to the center column (2); The top end of the sliding block (5) protrudes the supporting arm (4) and the side away from the center column (2) is penetrated to form a frame slot, a rotating frame (7) is slidably connected in the frame slot along the axial direction of the supporting arm (4), a rotating roller (8) is rotatably connected in the rotating frame (7), the side away from the frame slot of the rotating roller (8) abuts against the inner peripheral side of the steel ring, piezoelectric sheets are installed between the rotating frame (7) and the inner wall of the frame slot, a plurality of the piezoelectric sheets are electrically connected with a controller, a plurality of the piezoelectric sheets correspond to a plurality of the electromagnetic valves (52) one by one, the controller is installed on the base (1) and electrically connected with the gas pump (9), a plurality of the electromagnetic valves (52) and an external welding device.

2. The automatic position-limiting fan cover top assembling tool according to claim 1, characterized in that, The supporting arm (4) is provided with a sliding groove (41), the end of the sliding groove (41) away from the center column (2) is penetrated, and a fixing cap is clamped at the end of the sliding groove (41) away from the center column (2), a plurality of the sliding blocks (5) are slidably connected in the sliding groove (41).

3. The automatic position limiting fan cover top assembling tool according to claim 1, characterized in that, The electromagnetic valve (52) adopts a two-position three-way valve, wherein the electromagnetic valve (52) is in an initial state, the communication pipe (51) is communicated with the exhaust pipe (53) near one end of the central column (2) and blocks the communication of the two ends of the communication pipe (51), and in a working state, the two ends of the communication pipe (51) are communicated and the communication pipe (51) is blocked from being communicated with the exhaust pipe (53).

4. The automatic position-limiting fan cover top assembling tool according to claim 3, characterized in that, When the controller is working, the piezoelectric signals of a plurality of piezoelectric sheets in the same position with the central column (2) as the center are received, and a weldable indication signal is sent to the external welding equipment, then the welding completion signal sent by the external welding equipment is received, and a plurality of electromagnetic valves (52) corresponding to the plurality of piezoelectric sheets are controlled to work.

5. The automatic position-limiting fan cover top assembling tool according to claim 4, characterized in that, The rotating roller (8) is in the shape of a circular truncated cone, wherein the circular truncated cone-shaped rotating roller (8) is connected in an inverted manner in the rotating frame (7).

6. The automatic position-limiting fan cover top assembling tool according to claim 1, characterized in that, The steel bar fixing mechanism (10) comprises an edge column (11), a vertical sliding block (12), a supporting spring (13), a horizontal rod (14), a rotating rod (15) and a clamping frame (16), a plurality of edge columns (11) are in one-to-one correspondence with a plurality of clamping grooves (21) and are fixedly connected to the base (1), a vertical sliding groove is formed in the middle of the edge column (11) in the vertical direction, the vertical sliding groove is slidably connected with the vertical sliding block (12), the supporting spring (13) is fixedly connected between the bottom end of the vertical sliding block (12) and the bottom of the vertical sliding groove, the horizontal rod (14) is slidably connected to the top of the edge column (11) in the radial direction of the central column (2), wherein the vertical sliding groove is through on the side close to the central column (2), the rotating rod (15) is rotatably connected to the side close to the central column (2) of the vertical sliding block (12), the end of the rotating rod (15) away from the vertical sliding block (12) penetrates through the vertical sliding groove and is rotatably connected to the end of the horizontal rod (14) close to the central column (2), and the clamping frame (16) is fixedly connected to the end of the horizontal rod (14) close to the central column (2), and the fixing assembly (17) is connected in the clamping frame (16).

7. The automatic position-limiting fan cover top assembling tool according to claim 6, 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), wherein the opposite sides of the two fixing frames (171) in the clamping groove (21) and the clamping frame (16) are provided in an open manner, the fixing block (172) is slidably connected in the fixing frame (171) in the vertical direction, 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 supporting arm (4).

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