Gearbox screw automatic tightening machine

Abstract

The present application relates to the field of gearbox manufacturing and assembling, in particular to a gearbox screw automatic tightening machine, comprising a rack, the top surface of the rack is sequentially provided with a feeding station, a tightening station and a clamping station from front to back, the feeding station is provided with a feeding mechanism and a distribution mechanism, the distribution mechanism is arranged at the discharging end of the feeding mechanism, the tightening station is provided with a tightening mechanism and a sleeve switching mechanism, the sleeve switching mechanism is arranged on one side of the tightening mechanism, the clamping station is provided with a jacking positioning mechanism, the feeding mechanism, the distribution mechanism, the tightening mechanism, the sleeve switching mechanism and the jacking positioning mechanism can automatically tighten the screws of the gearbox, which is more accurate and faster than manual operation, and can effectively improve the production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the gearbox manufacturing assembly field, especially to the gearbox screw automatic tightening machine. BACKGROUND

[0002] The gearbox is the gear box that changes transmission ratio and movement direction. It is located between the clutch and the central transmission. The main function is: under the condition that the engine speed and torque are unchanged, the driving force and the running speed of the vehicle are changed (gear shifting); the vehicle can run backward (reversing); the engine can be parked without turning off (neutral), at present, the screw is needed in the process of assembling the gearbox, and the screw is generally tightened by the tightening device manually, because the number of screws to be tightened is large, the efficiency of manual tightening is low, and it is not conducive to large-scale production. SUMMARY

[0003] The present application is to overcome the above-mentioned deficiencies, and aims to provide a technical solution to solve the above-mentioned problems.

[0004] The gearbox screw automatic tightening machine comprises a rack, and the top surface of the rack is sequentially provided with a feeding station, a tightening station and a clamping station from front to back. The feeding station is provided with a feeding mechanism and a distribution mechanism. The distribution mechanism is arranged at the discharge end of the feeding mechanism. The tightening station is provided with a tightening mechanism and a sleeve switching mechanism. The sleeve switching mechanism is arranged on one side of the tightening mechanism. The clamping station is provided with a jacking positioning mechanism.

[0005] As a further scheme of the present application: the feeding mechanism comprises a first pedestal, and two groups of feeding assemblies are arranged side by side on the top surface of the first pedestal. The feeding assembly comprises a bottom plate, a support rod is vertically arranged on the top surface of the bottom plate, a storage box is arranged at the upper end of the support rod, a feeding disc is arranged below the discharge end of the storage box on the top surface of the bottom plate, a straight vibration track is arranged on one side of the feeding disc on the top surface of the bottom plate, and the discharge end of the feeding disc is connected with the feeding end of the straight vibration track.

[0006] As a further scheme of the present application: the distribution mechanism comprises a second pedestal, and a receiving plate is arranged on the top surface of the second pedestal. A receiving groove is formed in the top surface of the receiving plate, the discharge end of the straight vibration track is connected with the receiving groove, six through grooves are formed in the receiving plate along the length direction thereof, a first positioning clamp block is slidably arranged in the through groove, a first cylinder for driving the first positioning clamp block to move along the through groove is arranged on the front side of the receiving plate, a distribution plate is slidably arranged on the rear side of the receiving plate, six distribution grooves are formed in the distribution plate along the length direction thereof, a second positioning clamp block is arranged in the distribution groove, an electric sliding table is transversely arranged on the top surface of the second pedestal, and the sliding end of the electric sliding table is connected with the distribution plate.

[0007] As a further scheme of the present application, the front side of the first pedestal is provided with a connecting frame, three oil injectors are arranged side by side on the connecting frame, and the oil outlets of the oil injectors are directed towards the distribution plate. The top surface of the first pedestal is provided below the distribution plate with an oil receiving box.

[0008] As a further scheme of the present application, the tightening mechanism comprises a six-axis industrial robot, a mounting plate is mounted on the mechanical arm of the six-axis industrial robot, and three groups of tightening assemblies are sequentially arranged along the length direction of the mounting plate.

[0009] As a further scheme of the present application, the tightening assembly comprises a tightening gun, a switching clamp, a movable sleeve, a compression spring, a limiting spring, a four-square key, a tightening sleeve and a steel ball. The tightening sleeve is arranged at the lower end of the switching clamp. The upper end surface of the switching clamp is provided with a slot. The output shaft of the tightening gun is inserted into the slot. The inner wall of the slot is provided with a sliding groove. The limiting spring and the four-square key are arranged in the sliding groove. One end of the limiting spring abuts against the inner wall of the sliding groove, and the other end of the limiting spring abuts against the four-square key. The lower end surface of the output shaft of the tightening gun is formed with a four-square hole. The four-square key is inserted into the four-square hole under the action of the limiting spring. The surface of the switching clamp is provided with a plurality of steel ball limiting holes communicating with the slot. The steel ball is arranged in the steel ball limiting hole. The compression spring and the movable sleeve are both sleeved on the switching clamp. The surface of the output shaft of the tightening gun is formed with a clamping groove. The inner wall of the movable sleeve abuts against the steel ball so that the steel ball is clamped in the clamping groove. The surface of the switching clamp is formed with an annular boss. One end of the compression spring abuts against the annular boss, and the other end of the compression spring abuts against the movable sleeve. The inner wall of the movable sleeve is formed with a steel ball exit groove near the upper end surface thereof.

[0010] As a further scheme of the present application, the sleeve switching mechanism comprises a third pedestal. Two groups of sleeve switching devices are arranged side by side on the third pedestal. The sleeve switching device comprises a sleeve positioning seat. Three sleeve positioning holes are arranged on the sleeve positioning seat. A second air cylinder is vertically arranged on one side of the sleeve positioning seat. An active plate is arranged on the piston rod of the second air cylinder. A third air cylinder is longitudinally arranged on the top surface of the active plate. A push piece is arranged on the piston rod of the third air cylinder.

[0011] As a further scheme of the present application, the jacking positioning mechanism comprises a support seat. A fourth air cylinder is vertically arranged on the top surface of the support seat. A lifting positioning table is arranged on the piston rod of the fourth air cylinder. A positioning pin is arranged at each corner of the top surface of the lifting positioning table. A guide rod is arranged at each corner of the bottom surface of the lifting positioning table. A guide sleeve for cooperating with the guide rod is arranged on the top surface of the support seat. A mounting frame is arranged on one side of the top surface of the support seat. A fifth air cylinder is vertically arranged on the mounting frame. A blocking piece is arranged on the piston rod of the fifth air cylinder.

[0012] As a further scheme of the present application: the top surface of the rack is further provided with an outer cover, the distributing mechanism, the tightening mechanism, the sleeve switching mechanism and the jacking positioning mechanism are arranged in the outer cover, an industrial camera is arranged on the inner top wall of the outer cover above the jacking positioning mechanism, and a display screen, a control panel and an air source control unit are arranged on the side surface of the outer cover.

[0013] As a further scheme of the present application: the outer cover is provided with an inlet and an outlet at positions corresponding to the jacking positioning mechanism on the two sides, and safety grating is arranged at the inlet and the outlet.

[0014] Compared with the prior art, the present application has the beneficial effects that: through the arrangement of the feeding mechanism, the distributing mechanism, the tightening mechanism, the sleeve switching mechanism and the jacking positioning mechanism, the gearbox can be automatically screwed, which is more accurate and faster than manual operation, and can effectively improve the production efficiency.

[0015] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor under the premise of the drawings.

[0017] Figure 1 is a structural schematic diagram of the present application.

[0018] Figure 2 is a structural schematic diagram of the rack of the present application.

[0019] Figure 3 is a structural schematic diagram of the feeding assembly of the present application.

[0020] Figure 4 is a structural schematic diagram of the oil sprayer of the present application.

[0021] Figure 5 is a structural schematic diagram of the receiving plate of the present application.

[0022] Figure 6 is a structural schematic diagram of the distributing plate of the present application.

[0023] Figure 7 is a structural schematic diagram of the tightening assembly of the present application.

[0024] Figure 8 is a structural schematic diagram of the tightening gun of the present application.

[0025] Figure 9 is the schematic diagram of the switching clamp structure of the present application.

[0026] Figure 10 is the schematic diagram of the tightening sleeve structure of the present application.

[0027] Figure 11 is the schematic diagram of the sleeve switching device structure of the present application.

[0028] Figure 12 is the schematic diagram of the lifting positioning table structure of the present application.

[0029] In the figure: 1, rack, 2, feeding mechanism, 3, distribution mechanism, 4, tightening mechanism, 5, sleeve switching mechanism, 6, jacking positioning mechanism, 7, first pedestal, 8, feeding assembly, 9, support rod, 10, storage box, 11, feeding disc, 12, straight vibration track, 13, second pedestal, 14, receiving plate, 15, receiving groove, 16, through groove, 17, first positioning clamp block, 18, first air cylinder, 19, distribution plate, 20, distribution groove, 21, second positioning clamp block, 22, electric sliding table, 23, connecting frame, 24, oil sprayer, 25, oil receiving box, 26, six-axis industrial robot, 27, mounting plate, 28, tightening assembly, 29, tightening gun, 30, switching clamp, 31, movable sleeve, 32, compression spring, 33, limiting spring, 34, square key, 35, tightening sleeve, 36, steel ball, 37, insertion slot, 38, sliding groove, 39, square hole, 40, steel ball limiting hole, 41, clamping groove, 42, annular boss, 43, steel ball exit slot, 44, third pedestal, 45, sleeve switching device, 46, sleeve positioning seat, 47, sleeve positioning hole, 48, second air cylinder, 49, movable plate, 50, third air cylinder, 51, push piece, 52, support seat, 53, fourth air cylinder, 54, lifting positioning table, 55, positioning pin, 56, guide rod, 57, guide sleeve, 58, mounting frame, 59, fifth air cylinder, 60, blocking piece, 61, outer cover, 62, industrial camera, 63, display screen, 64, control panel, 65, air source control unit, 66, inlet, 67, outlet, 68, safety grating, 69, bottom plate. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0031] Please refer to Figures 1-11The gearbox screw automatic tightening machine in the embodiment of the application comprises a rack 1, the top surface of the rack 1 is sequentially provided with a feeding station, a tightening station and a clamping station from front to back, the feeding station is provided with a feeding mechanism 2 and a distribution mechanism 3, the distribution mechanism 3 is arranged at the discharging end of the feeding mechanism 2, the tightening station is provided with a tightening mechanism 4 and a sleeve switching mechanism 5, the sleeve switching mechanism 5 is arranged on one side of the tightening mechanism 4, and the clamping station is provided with a jacking positioning mechanism 6. Through the arrangement of the feeding mechanism 2, the distribution mechanism 3, the tightening mechanism 4, the sleeve switching mechanism 5 and the jacking positioning mechanism 6, the gearbox can be automatically screwed, the precision is higher, the speed is faster, and the production efficiency can be effectively improved.

[0032] The feeding mechanism 2 comprises a first pedestal 7, the top surface of the first pedestal 7 is provided with two groups of feeding assemblies 8 side by side, the feeding assembly 8 comprises a bottom plate 69, the top surface of the bottom plate 69 is vertically provided with a support rod 9, the upper end of the support rod 9 is provided with a storage box 10, the top surface of the bottom plate 69 is provided with a feeding disc 11 below the discharging end of the storage box 10, the top surface of the bottom plate 69 is provided with a straight vibration track 12 on one side of the feeding disc 11, and the discharging end of the feeding disc 11 is connected with the feeding end of the straight vibration track 12. Through the arrangement of the two groups of feeding assemblies 8, two different specifications of screws can be conveyed.

[0033] The distribution mechanism 3 comprises a second pedestal 13, the top surface of the second pedestal 13 is provided with a receiving plate 14, the top surface of the receiving plate 14 is provided with a receiving groove 15, the discharging end of the straight vibration track 12 is connected with the receiving groove 15, six through grooves 16 are formed on the receiving plate 14 along the length direction of the receiving plate 14, a first positioning clamp block 17 is slidably installed in the through groove 16, a first cylinder 18 for driving the first positioning clamp block 17 to move along the through groove 16 is arranged on the front side of the receiving plate 14, a distribution plate 19 is slidably installed on the rear side of the receiving plate 14, six distribution grooves 20 are formed on the distribution plate 19 along the length direction of the distribution plate 19, a second positioning clamp block 21 is arranged in the distribution groove 20, a motor sliding table 22 is transversely arranged on the top surface of the second pedestal 13, the sliding end of the motor sliding table 22 is connected with the distribution plate 19, the straight vibration track 12 conveys the screws one by one into the receiving groove 15, the distribution plate 19 reciprocally moves along the length direction of the receiving plate 14 under the drive of the motor sliding table 22, so that the screws in the receiving groove 15 fall into the distribution groove 20, through the arrangement of the six distribution grooves 20, three distribution grooves 20 are taken as a group, two different specifications of screws can be respectively received, when the six distribution grooves 20 are all filled with screws, the distribution plate 19 moves under the drive of the motor sliding table 22, so that the distribution groove 20 is connected with the through groove 16, and then the first positioning clamp block 17 moves backward under the drive of the first cylinder 18, and the second positioning clamp block 21 is matched to clamp and position the screws.

[0034] The front side of the first pedestal 7 is provided with a connecting frame 23, three oil injectors 24 are arranged side by side on the connecting frame 23, the oil outlets of the oil injectors 24 are directed towards the distribution plate 19, and the top surface of the first pedestal 7 is provided with an oil receiving box 25 below the distribution plate 19. Through the arrangement of the connecting frame 23 and the oil injectors 24, lubricating oil can be sprayed on the screws during the screw distribution process. Through the arrangement of the oil receiving box 25, the lubricating oil can drip into the oil receiving box 25 during the oil spraying process, so as to avoid dripping on the rack 1, and also to collect excess lubricating oil and reduce the loss of lubricating oil.

[0035] The tightening mechanism 4 comprises a six-axis industrial robot 26, a mounting plate 27 is mounted on the mechanical arm of the six-axis industrial robot 26, and three groups of tightening assemblies 28 are sequentially arranged on the mounting plate 27 along the length direction of the mounting plate 27. Through the arrangement of the three groups of tightening assemblies 28, three screws can be loaded, taken and tightened in one tightening work, and the working efficiency is effectively improved.

[0036] The tightening assembly 28 comprises a tightening gun 29, a switching clamp 30, a movable sleeve 31, a compression spring 32, a limiting spring 33, a square key 34, a tightening sleeve 35 and a steel ball 36. The tightening sleeve 35 is arranged at the lower end of the switching clamp 30. The upper end surface of the switching clamp 30 is provided with a slot 37. The output shaft of the tightening gun 29 is inserted into the slot 37. The inner wall of the slot 37 is provided with a sliding groove 38. The limiting spring 33 and the square key 34 are arranged in the sliding groove 38. One end of the limiting spring 33 abuts against the inner wall of the sliding groove 38. The other end of the limiting spring 33 abuts against the square key 34. The lower end surface of the output shaft of the tightening gun 29 is formed with a square hole 39. The square key 34 is inserted into the square hole 39 under the action of the limiting spring 33. The surface of the switching clamp 30 is provided with a plurality of steel ball limiting holes 40 which are communicated with the slot 37. The steel ball 36 is arranged in the steel ball limiting hole 40. The compression spring 32 and the movable sleeve 31 are both sleeved on the switching clamp 30. The surface of the output shaft of the tightening gun 29 is formed with a clamping groove 41. The inner wall of the movable sleeve 31 abuts against the steel ball 36 so that the steel ball 36 is clamped in the clamping groove 41. The surface of the switching clamp 30 is formed with an annular boss 42. One end of the compression spring 32 abuts against the annular boss 42. The other end of the compression spring 32 abuts against the movable sleeve 31. The inner wall of the movable sleeve 31 is formed with a steel ball exit groove 43 near the upper end surface thereof. In the tightening work, the tightening gun 29 is moved to above the distribution groove 20 under the driving of the six-axis robot 26. Then the tightening gun 29 is driven to move downward, so that the end of the tightening sleeve 35 is connected with the screw cap of the screw in the distribution groove 20. Then the tightening gun 29 is moved to above the corresponding screw hole of the gearbox. The tightening sleeve 35 is rotated by the operation of the tightening gun 29, so that the screw is screwed into the corresponding screw hole of the gearbox. The movable sleeve 31 always has a tendency to move upward under the action of the compression spring 32, so that the steel ball 36 is clamped in the clamping groove 41 to realize the connection between the tightening gun 29 and the tightening sleeve 35. When it is needed to separate the tightening gun 29 from the tightening sleeve 35, the movable sleeve 31 is only needed to be driven to move downward, so that the steel ball 36 is rolled into the steel ball exit groove 43 from the clamping groove 41, and then the tightening gun 29 can be separated from the tightening sleeve 35.

[0037] The sleeve switching mechanism 5 comprises a third base 44, two sets of sleeve switching devices 45 are arranged side by side on the third base 44, the sleeve switching device 45 comprises a sleeve positioning seat 46, the sleeve positioning seat 46 is provided with three sleeve positioning holes 47, a second air cylinder 48 is vertically arranged on one side of the sleeve positioning seat 46, an active plate 49 is arranged on the piston rod of the second air cylinder 48, a third air cylinder 50 is longitudinally arranged on the top surface of the active plate 49, a push piece 51 is arranged on the piston rod of the third air cylinder 50, by arranging two sets of sleeve switching devices 45, different specifications of tightening sleeves 35 can be placed, when the tightening sleeve 35 is switched, the six-axis industrial robot 26 drives the tightening assembly 28 to move above one of the sleeve positioning seats 46, then moves downward to insert the tightening sleeve 35 into the sleeve positioning hole 47, one of the push pieces 51 moves to push the movable sleeve 31, so that the tightening gun 29 is separated from the tightening sleeve 35, then the six-axis industrial robot 26 drives the tightening gun 29 to move above the sleeve positioning seat 46 provided with another specification of tightening sleeve 35, the other push piece 51 moves to press the movable sleeve 31 on the other specification of tightening sleeve 35, then the tightening gun 29 moves downward to be inserted into the switching clamp 30 on the other specification of tightening sleeve 35, the push piece 51 is reset, the other specification of tightening sleeve 35 is fixed on the output shaft of the tightening gun 29, the switching of the tightening sleeve 35 is realized.

[0038] The jacking positioning mechanism 6 comprises a support seat 52, a fourth air cylinder 53 is vertically arranged on the top surface of the support seat 52, a lifting positioning table 54 is arranged on the piston rod of the fourth air cylinder 53, positioning pins 55 are arranged at four corners of the top surface of the lifting positioning table 54, guide rods 56 are arranged at four corners of the bottom surface of the lifting positioning table 54, a guide sleeve 57 for cooperating with the guide rods 56 is arranged on the top surface of the support seat 52, a mounting frame 58 is arranged on one side of the top surface of the support seat 52, a fifth air cylinder 59 is vertically arranged on the mounting frame 58, a blocking piece 60 is arranged on the piston rod of the fifth air cylinder 59, during machining, the gearbox is placed on the lifting positioning table 54, the lifting positioning table 54 can move upward or downward under the drive of the fourth air cylinder 53, so as to drive the gearbox to rise or fall.

[0039] The top surface of the frame 1 is further provided with an outer cover 61, the distributing mechanism 3, the tightening mechanism 4, the sleeve switching mechanism 5 and the jacking positioning mechanism 6 are arranged in the outer cover 61, an industrial camera 62 is arranged on the inner top wall of the outer cover 61 above the jacking positioning mechanism 6, a display screen 63, a control panel 64 and an air source control unit 65 are arranged on the side surface of the outer cover 61, by arranging the industrial camera 62, the display screen 63 and the control panel 64, the screw tightening working condition can be monitored in real time, the quality stability is ensured, and the operation and control are facilitated.

[0040] In order to facilitate the staff to place the gearbox, the two sides of the outer cover 61 correspond to the position of the lifting positioning mechanism 6 respectively open the inlet 66 and the outlet 67, the inlet 66 and the outlet 67 are equipped with safety grating 68.

[0041] The working principle of the present application is: during processing, the gearbox is placed on the lifting positioning mechanism 6, the lifting positioning mechanism 6 drives the gearbox to rise, then the mechanical arm of the six-axis industrial robot 26 drives the tightening assembly 28 to move to the distribution mechanism 3 to pick up the screw, then the corresponding part of the gearbox is tightened, when different specifications of screws need to be tightened during the tightening work, the mechanical arm of the six-axis industrial robot 26 drives the tightening assembly 28 to move to the sleeve switching mechanism 5 to switch another specification of the tightening sleeve 35, then moves to the distribution mechanism 3 to pick up another specification of the screw, then the corresponding part of the gearbox is tightened, and the industrial camera takes a photo for the staff to check, realizing automatic screw tightening work of the gearbox, higher precision and faster speed compared with manual work, which can effectively improve the production efficiency and ensure the stability of the quality.

[0042] The application of the present application is not limited to the field of gearbox manufacturing and assembly, but can also be applied in the field of high-end manufacturing. The application scenarios of the present application meet the following conditions: 1, high-end manufacturing and assembly occasions. 2, applied to M6 or heavier screw assembly, because the heavier screw cannot be directly transported to the head position of the tightening sleeve by using the general vacuum air suction method, only manual or single grabbing mechanism can be used in reality, the present application sets three sets of tightening assemblies, which can pick up and tighten three screws at a time, reducing the round trip time and improving the work efficiency. 3, applied to the occasion of assembling two different specifications of screws at the same station, the present application can automatically switch the tightening sleeve through the setting of the sleeve switching mechanism. 4, applied to the occasion of assembling multiple position specifications of screws at the same station, the present application uses the six-axis industrial robot to drive the tightening assembly to move, which can meet the demand of automatic tightening of multiple positions.

[0043] For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A gearbox screw automatic tightening machine, characterized in that: The rack comprises a rack top surface of which is sequentially provided with a feeding station, a tightening station and a clamping station from front to back, the feeding station is provided with a feeding mechanism and a distribution mechanism, the distribution mechanism is arranged at the discharge end of the feeding mechanism, the tightening station is provided with a tightening mechanism and a sleeve switching mechanism, the sleeve switching mechanism is arranged on one side of the tightening mechanism, and the clamping station is provided with a jacking positioning mechanism; The feeding mechanism comprises a first pedestal, the top surface of the first pedestal is provided with two groups of feeding assemblies side by side, the feeding assembly comprises a bottom plate, the top surface of the bottom plate is vertically provided with a support rod, the upper end of the support rod is provided with a storage box, the top surface of the bottom plate is provided with a feeding disc below the discharge end of the storage box, the top surface of the bottom plate is provided with a straight vibration track on one side of the feeding disc, and the discharge end of the feeding disc is connected with the feeding end of the straight vibration track; The distribution mechanism comprises a second pedestal, the top surface of the second pedestal is provided with a receiving plate, the top surface of the receiving plate is provided with a receiving groove, the discharge end of the straight vibration track is connected with the receiving groove, six through grooves are formed on the receiving plate along the length direction of the receiving plate, a first positioning clamp is slidably arranged in the through groove, a first cylinder for driving the first positioning clamp to move along the through groove is arranged on the front side of the receiving plate, a distribution plate is slidably arranged on the rear side of the receiving plate, six distribution grooves are formed on the distribution plate along the length direction of the distribution plate, a second positioning clamp is arranged in the distribution groove, and an electric sliding table is transversely arranged on the top surface of the second pedestal. The front side of the first pedestal is provided with a connecting frame, three oil sprayers are arranged on the connecting frame side by side, the oil outlets of the oil sprayers are directed to the distribution plate, and an oil receiving box is arranged on the top surface of the first pedestal below the distribution plate. The tightening mechanism comprises a six-axis industrial robot, a mounting plate is arranged on the mechanical arm of the six-axis industrial robot, and three groups of tightening assemblies are sequentially arranged on the mounting plate along the length direction of the mounting plate.

2. The gearbox screw automatic tightening machine according to claim 1, characterized in that: The tightening assembly comprises a tightening gun, a switching clamp, a movable sleeve, a compression spring, a limiting spring, a square key, a tightening sleeve and a steel ball, the tightening sleeve is arranged at the lower end of the switching clamp, a slot is formed in the upper end surface of the switching clamp, the output shaft of the tightening gun is inserted into the slot, a sliding groove is formed in the inner wall of the slot, the limiting spring and the square key are arranged in the sliding groove, one end of the limiting spring abuts against the inner wall of the sliding groove, the other end of the limiting spring abuts against the square key, a square hole is formed in the lower end surface of the output shaft of the tightening gun, the square key is inserted into the square hole under the action of the limiting spring, a plurality of steel ball limiting holes are formed in the surface of the switching clamp and communicated with the slot, the steel ball is arranged in the steel ball limiting hole, the compression spring and the movable sleeve are sleeved on the switching clamp, a clamping groove is formed in the surface of the output shaft of the tightening gun, the inner wall of the movable sleeve abuts against the steel ball so that the steel ball is clamped in the clamping groove, an annular boss is formed in the surface of the switching clamp, one end of the compression spring abuts against the annular boss, the other end of the compression spring abuts against the movable sleeve, and a steel ball exit groove is formed in the inner wall of the movable sleeve close to the upper end surface thereof.

3. The gearbox screw automatic tightening machine according to claim 1, characterized in that: The sleeve switching mechanism comprises a third base, two sets of sleeve switching devices are arranged side by side on the third base, the sleeve switching device comprises a sleeve positioning seat, three sleeve positioning holes are arranged on the sleeve positioning seat, a second air cylinder is vertically arranged on one side of the sleeve positioning seat, a movable plate is arranged on the piston rod of the second air cylinder, a third air cylinder is longitudinally arranged on the top surface of the movable plate, and a shifting piece is arranged on the piston rod of the third air cylinder.

4. The gearbox screw automatic tightening machine according to claim 1, characterized in that: The jacking positioning mechanism comprises a supporting seat, a fourth air cylinder is vertically arranged on the top surface of the supporting seat, a lifting positioning table is arranged on the piston rod of the fourth air cylinder, a positioning pin is arranged at each corner of the top surface of the lifting positioning table, a guide rod is arranged at each corner of the bottom surface of the lifting positioning table, a guide sleeve for cooperating with the guide rod is arranged on the top surface of the supporting seat, a mounting frame is arranged on one side of the top surface of the supporting seat, a fifth air cylinder is vertically arranged on the mounting frame, and a blocking piece is arranged on the piston rod of the fifth air cylinder.

5. The gearbox screw automatic tightening machine according to claim 1, characterized in that: The top surface of the frame table is further provided with an outer cover, the distributing mechanism, the tightening mechanism, the sleeve switching mechanism and the jacking positioning mechanism are arranged in the outer cover, an industrial camera is arranged on the inner top wall of the outer cover and located above the jacking positioning mechanism, and a display screen, a control panel and an air source control unit are arranged on the side surface of the outer cover.

6. The gearbox screw auto-tightening machine according to claim 5, characterized in that: Safety grating is arranged at the inlet and the outlet.

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