A double-station screw tightening device

Abstract

The present invention relates to the technical field of mechanical equipment, and is a double-station screw tightening equipment, comprising a frame, an upper base plate, a lower base plate, and two screw tightening stations; each screw tightening station comprises a sliding fork positioning tool, a base, a lifting cylinder, a slide rail, a slider, a sliding seat, and three tightening guns; the sliding fork positioning tool is fixed to the top surface of the base plate, and is provided with a sliding fork positioning hole and three nut positioning holes; the upper base plate is provided with a through hole corresponding to the sliding fork positioning hole; the base is fixed to the rear side of the sliding fork positioning tool, the slide rail is installed on the front side of the base, the sliding seat is installed on the slide rail through the slider, the top of the sliding seat is horizontally fixed with a sliding base plate, the lifting cylinder is vertically fixed to the upper end of the base, the lift cylinder has a top rod arranged downward and connected to the sliding seat, driving the sliding seat to vertically lift and lower along the slide rail; three tightening guns are vertically installed on the sliding base plate, the gun heads are cantilevered downward and correspond one by one to the three nut positioning holes on the sliding fork positioning tool.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical equipment, in particular to a double-station screw tightening device. Background Art

[0002] The transmission shaft with an elastic coupling structure has an elastic coupling between its two sliding forks, and a triangular plate is fixed on each sliding fork. The triangular plates of the two sliding forks are fixedly connected to the elastic coupling through hexagonal bolts and nuts. At present, after the elastic coupling and the sliding fork are assembled and placed on the platform, a handheld tightening gun is needed to tighten the hexagonal bolts and nuts, which has the problem of low positioning accuracy; and the two triangular plates and the elastic coupling need to tighten 6 screws in both directions. The existing screw tightening machine has only a single station, and only tightens 3 screws at a time. The other three need to be tightened manually, which is not easy to align and difficult to operate. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the above-mentioned background technology and provide a double-station screw tightening device to achieve precise positioning of the elastic coupling and the sliding fork, use a tightening gun to tighten instead of manual tightening, and improve work efficiency.

[0004] The technical solution adopted by the present invention is as follows: a double-station screw tightening device, comprising a frame, an upper base plate fixed to the middle of the frame, a lower base plate fixed to the bottom of the frame, and two screw tightening stations installed on the top surface of the upper base plate;

[0005] Each screw tightening station includes a sliding fork positioning fixture, a base, a lifting cylinder, a slide rail, a slider, a sliding seat and three tightening guns; the sliding fork positioning fixture is fixed to the top surface of the base plate, and is provided with a sliding fork positioning hole and three nut positioning holes; the upper base plate is provided with through holes corresponding to the sliding fork positioning holes; the base is vertically fixed to the rear side of the sliding fork positioning fixture, the slide rail is vertically installed on the front side of the base, the sliding seat is installed on the slide rail through the slider, the top of the sliding seat is horizontally fixed with a sliding base plate, the lifting cylinder is vertically fixed to the upper end of the base, the lift cylinder's top rod is arranged downward and connected to the sliding seat, driving the sliding seat to vertically lift and lower along the slide rail;

[0006] Three tightening guns are vertically installed on the sliding base plate, with the gun heads cantilevered downward and corresponding one by one to the three nut positioning holes on the sliding fork positioning tooling. An annular magnet is arranged on the gun head, and an avoidance opening for avoiding the sliding fork is opened on the sliding base plate. The avoidance opening is located in the middle position of the three tightening guns and corresponds up and down to the sliding fork positioning hole.

[0007] Furthermore, the sliding fork positioning tooling includes a sliding fork base and three pairs of auxiliary positioning parts and three positioning pins installed thereon; the sliding fork base is fixed to the top surface of the upper base plate, and the sliding fork positioning hole is opened on the sliding fork base in the vertical direction. The mounting holes of the three pairs of auxiliary positioning parts and the three positioning pin mounting holes are arranged at intervals from each other and are evenly arranged in a circle around the sliding fork positioning hole. A distance is maintained between the two auxiliary positioning parts of each pair of auxiliary positioning parts to accommodate the connecting part of the triangular disk, and the sliding fork base is opened with the nut positioning hole between the two auxiliary positioning parts, and the nut positioning hole corresponds to the connecting hole of the connecting part of the triangular disk.

[0008] Furthermore, the auxiliary positioning member is a hexagon socket bolt.

[0009] Furthermore, the upper end of the positioning pin is conical or truncated cone-shaped.

[0010] Furthermore, the three tightening guns are respectively mounted on the sliding base plate through adjustment mechanisms, and each adjustment mechanism includes a connecting block, a connecting seat, a pressing block and an adjustment assembly;

[0011] The top surface of the sliding bottom plate is provided with three guide grooves, which are arranged at equal angles in a horizontal plane with the radially parallel axis of the sliding fork positioning hole as the center;

[0012] The connecting block can be slidably fitted in the guide groove, and the two sides of the connecting block are respectively pressed by pressing blocks;

[0013] The tightening gun is vertically fixed on the inner end of the connecting block, and a mounting opening for the tightening gun is provided on the sliding bottom plate;

[0014] The connecting seat is fixed on the outer end of the connecting block, the adjusting assembly is installed on the sliding bottom plate and connected to the connecting seat, and the connecting block is forced by the connecting seat to make the connecting block drive the tightening gun to slide in the guide groove.

[0015] Furthermore, the adjustment assembly includes an adjusting screw, an adjusting nut, a bearing, and a fixed seat. The adjusting nut is fixed on the connecting block. The fixed seat is fixed on the sliding base plate and is located at the outer end of the guide groove. The adjusting screw is rotatably mounted on the fixed seat through the bearing. The adjusting screw cooperates with the adjusting nut. When the adjusting screw is rotated, the adjusting nut drives the connecting block and the tightening gun installed on the connecting block to slide in the guide groove through the connecting seat.

[0016] Furthermore, one of the two screw tightening stations is provided with a workpiece ejection mechanism, which is arranged on the lower base plate and below the sliding fork positioning tooling, and includes a vertically arranged cylinder support base, an ejection guide sleeve fixed on the top of the cylinder support base, and an ejection cylinder vertically fixed on the cylinder support base, the ejection guide sleeve is provided with a bell mouth, the bell mouth is coaxial with the sliding fork positioning hole, the large mouth end of the bell mouth is arranged upward, and the ejector rod of the ejection cylinder is vertically upward and extends into the bell mouth from the small mouth end at the bottom of the bell mouth.

[0017] Furthermore, buffers are respectively provided at the upper and lower ends of the slide rail, an upper limit block is fixed at the upper end of the slide rail to limit the height of the upper limit position of the sliding seat, and a lower limit screw is provided at the lower end of the slide rail. The lower limit screw is vertically fixed to the upper base plate through the lower limit block, and the height of the lower limit position of the sliding seat is adjusted by the lower limit screw.

[0018] Furthermore, the tightening gun is connected to a control machine via a cable, and a screen of the control machine displays the torque of the tightening gun.

[0019] The beneficial effects of the present invention are as follows: compared with the existing manual assembly and tightening, the present invention is provided with a double workstation, and tightening with a tightening gun replaces manual tightening, thereby improving work efficiency; the triangular disk and the nut of the sliding fork are positioned by the sliding fork positioning tool, so that the relative position of the sliding fork and the elastic coupling can be ensured, and the overall position accuracy of the sliding fork, the elastic coupling and the tightening device can be maintained; the tightening gun can automatically tighten the hexagonal bolts and the nuts, and connect the triangular disk of the sliding fork with the elastic coupling, thereby greatly simplifying the work rhythm of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a main structural schematic diagram of the present invention.

[0021] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0022] Figure 3 yes Figure 1 Enlarged view of part B in the middle.

[0023] Figure 4 It is a left-side structural schematic diagram of the present invention.

[0024] Figure 5 yes Figure 4 Enlarged view of part C in the middle.

[0025] Figure 6 yes Figure 4 Enlarged view of part D in the middle.

[0026] Figure 7 It is a schematic diagram of the top structure of the present invention.

[0027] Figure 8 It is a cross-sectional structural diagram after the sliding fork positioning fixture, the elastic coupling and the sliding fork are assembled.

[0028] Fig. 9 It is a schematic diagram of the structure of the sliding fork positioning fixture and the sliding fork after being assembled from a top view.

[0029] Fig.10 It is a top view structural diagram of the sliding fork positioning tooling. DETAILED DESCRIPTION

[0030] In order to enable ordinary technicians in the field to more clearly understand the objectives, technical solutions and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, a person skilled in the art can understand the specific meanings of general terms in the present invention according to specific circumstances.

[0032] like Figure 1 , Figure 4 , Figure 7 As shown, a double-station screw tightening device provided by the present invention includes a frame 25, an upper base plate 4 fixed to the middle of the frame 25, a lower base plate fixed to the bottom of the frame 25, and two screw tightening stations installed on the top surface of the upper base plate 4.

[0033] Each screw tightening station includes a sliding fork positioning fixture 5, a base 22, a lifting cylinder 15, a slide rail 11, a slider 27, a sliding seat 8 and three tightening guns 16. The sliding fork positioning fixture 5 is fixed to the top surface of the bottom plate and is provided with a sliding fork positioning hole 5.9 and three nut positioning holes 5.10. The upper bottom plate 4 is provided with a through hole corresponding to the sliding fork positioning hole 5.9. The base 22 is vertically fixed on the rear side of the sliding fork positioning tooling 5, the slide rail 11 is vertically installed on the front side of the base 22, the sliding seat 8 is fixed on the middle plate 26, and the middle plate 26 is installed on the slide rail 11 through a slider 27. The sliding seat 8 is L-shaped, and a rib 28 is provided between the vertical section and the horizontal section of the L-shape. The vertical section is fixedly connected to the middle plate 26, and the horizontal section at the top of the vertical section is horizontally fixed with a sliding bottom plate 9. The lifting cylinder 15 is vertically fixed to the upper end of the base 22, and the top rod of the lifting cylinder 15 is arranged downward and connected to the sliding seat 8, driving the sliding seat 8 to vertically rise and fall along the slide rail 11.

[0034] Three tightening guns 16 are vertically mounted on the sliding base plate 9, and the gun heads 7 are suspended downward and correspond one by one to the three nut positioning holes 5.10 on the sliding fork positioning fixture 5, and an annular magnet is arranged on the gun heads 7. An escape hole 8.1 for avoiding the sliding fork 5.1 is provided on the sliding base plate 9, and the escape hole 8.1 is located in the middle of the three tightening guns 16 and corresponds up and down to the sliding fork positioning hole 5.9. The tightening guns 16 are connected to the control machine through cables, and the screen of the control machine displays the torque of the tightening guns 16.

[0035] like Figure 3 , Figure 8 , Fig. 9 , Fig.10 As shown, the sliding fork positioning tool 5 includes a sliding fork base 5.2 and three pairs of auxiliary positioning members 5.8 and three positioning pins 5.7 installed thereon. The sliding fork base 5.2 is fixed to the top surface of the upper base plate 4. The sliding fork positioning hole 5.9 is provided on the sliding fork base 5.2 in the vertical direction. The mounting holes of the three pairs of auxiliary positioning members 5.8 and the three positioning pin mounting holes 5.9 are arranged at intervals from each other (with an angle of 60° between each other) and are evenly arranged in a circle around the sliding fork positioning hole 5.9. The two auxiliary positioning members 5.8 of each pair of auxiliary positioning members 5.8 are kept at a distance to accommodate the connection part of the triangular plate 5.3. The sliding fork base 5.2 is provided with the nut positioning hole 5.10 between the two auxiliary positioning members 5.8. The nut positioning hole 5.10 corresponds to the connection hole 5.3.1 of the connection part of the triangular plate 5.3. The auxiliary positioning member 5.8 is a hexagon socket bolt. The upper end of the positioning pin 5.7 is conical or truncated cone.

[0036] like Figure 2 , Figure 5 , Figure 6 , Figure 7 As shown, the three tightening guns 16 are respectively installed on the sliding base plate 9 through adjustment mechanisms, and each adjustment mechanism includes a connecting block 29, a connecting seat 18, a pressing block 10 and an adjusting component.

[0037] The top surface of the sliding base plate 9 is provided with three guide grooves 30, which are arranged at equal angles in the horizontal plane (angle 120°) with the radially parallel axis of the sliding fork positioning hole 5.9 as the center; the connecting block 29 can be slidably fitted in the guide groove 30, and the two sides of the connecting block 29 are respectively pressed by the pressing block 10. The tightening gun 16 is vertically fixed to the inner end of the connecting block 29, and the sliding base plate 9 is provided with a mounting port 29.1 for the tightening gun 16. The connecting seat 18 is fixed to the outer end of the connecting block 29, and the adjustment component is installed on the sliding base plate 9 and connected to the connecting seat 18. The connecting seat 18 applies force to the connecting block 29, so that the connecting block 29 drives the tightening gun 16 to slide in the guide groove 30, and the concentricity of the three tightening guns 16 is adjusted.

[0038] The adjusting assembly includes an adjusting screw 20, an adjusting nut 17, a bearing 21, and a fixing seat 19. The adjusting nut 17 is fixed on a connecting block 29. The fixing seat 19 is fixed on a sliding base plate 9 and is located at the outer end of a guide groove 30. The adjusting screw 20 is rotatably mounted on the fixing seat 19 through a bearing 21. The adjusting screw 20 cooperates with the adjusting nut 17. When a knob 31 fixed at the outer end of the adjusting screw 20 is rotated, the adjusting nut 17 drives the connecting block 29 and the tightening gun 16 mounted on the connecting block 29 to slide in the guide groove 30 through the connecting seat 18.

[0039] Among the two screw tightening stations, one of the screw tightening stations is provided with a workpiece ejection mechanism, which is arranged on the lower base plate and located below the sliding fork positioning tooling 5, and includes a vertically arranged cylinder support base 1, an ejection guide sleeve 3 fixed on the top of the cylinder support base 1, and an ejection cylinder 2 vertically fixed on the cylinder support base 1, the ejection guide sleeve 3 is formed with a bell mouth, the bell mouth is coaxial with the sliding fork positioning hole 5.9, the large mouth end of the bell mouth is arranged upward, and the ejector rod of the ejection cylinder 2 is vertically upward and extends into the bell mouth from the small mouth end at the bottom of the bell mouth.

[0040] The upper and lower ends of the slide rail 11 are provided with buffers 14, respectively. The buffer 14 at the upper end is vertically mounted on the base 22 of the two screw tightening stations through the upper bracket 13, and the buffer 14 at the lower end is vertically mounted on the upper base plate 4 through the support 24. An upper limit block 12 is fixed to the upper end of the slide rail 11 to limit the height of the upper limit position of the sliding seat 8. A lower limit screw 23 is provided at the lower end of the slide rail 11. The lower limit screw 23 is vertically fixed to the upper base plate 4 through the lower limit block 6, and the height of the lower limit position of the sliding seat 8 is adjusted by the lower limit screw 23.

[0041] The hexagon socket bolt is replaceable and universal, and can be replaced at any time according to the different external dimensions of the triangular plate 5.3, thereby ensuring the reliability of positioning. The upper end of the positioning pin 5.7 is conical or truncated cone-shaped.

[0042] The working principle of the present invention is:

[0043] In this example, first put three nuts 5.12 to be tightened into the nut positioning hole 5.10 of the right workstation, and the nuts 5.12 will not rotate circumferentially in the nut positioning hole 5.10. Then put in the first sliding fork 5.1. The sliding fork positioning tool 5 has 6 auxiliary positioning parts 5.8, and the auxiliary positioning parts 5.8 can be replaced multiple times to finally adapt to the shape of the triangular disk 5.3 with different dimensions, and realize the initial positioning of the sliding fork 1 with relatively high positioning accuracy to meet the requirements of the next step of the process. After the first sliding fork 5.1 is placed, put in the elastic coupling 5.4, and rely on the sleeve 5.5 in the elastic coupling 5.4 and the three positioning pins 5.7 on the tool for precise positioning. At the same time, the sleeve 5.5 cooperates with the countersunk holes at the three connecting holes 3.1 of the triangular disk 5.3 to ensure the relative position of the sliding fork 5.1 and the elastic coupling 5.4. The gun head 7 of the tightening gun 16 is magnetic. After the hexagon socket bolt 5.6 is absorbed and cooperated with it, the lifting cylinder 15 drives the three tightening guns 16 to descend. After the hexagon socket bolt 5.6 passes through the sleeve 5.5 and the connecting hole 5.3.1, the gun head 7 drives the hexagon socket bolt 5.6 to rotate and tightens the nut 5.12 in the nut positioning hole 5.10. After the three hexagon socket bolts 5.6 and the three nuts 5.12 are tightened, the lifting cylinder 15 drives the three tightening guns 16 to rise.

[0044] Remove the first sliding fork 5.1 from the right station. At this time, the triangular plate 5.3 of the sliding fork 5.1 is connected to the elastic coupling 5.4. At this time, the screwing operation of another sliding fork can be carried out at the right station. Put the second sliding fork 5.1 and three nuts 5.12 in the left station. After positioning, turn the first sliding fork 5.1 upside down, with the elastic coupling 5.4 facing downward. The triangular plate 5.3 of the first sliding fork 5.1 and the triangular plate 5.3 of the second sliding fork 5.1 are staggered at an angle, and the elastic coupling 5.4 is positioned. Then follow the above operation to tighten the three hexagon socket bolts 5.6 and three nuts 5.12 of the second sliding fork 5.1. At this time, the transmission shaft connection is completed, and the ejector rod of the ejector cylinder 2 lifts the entire workpiece. The worker takes it out and performs the next screwing operation.

[0045] The above is only a preferred embodiment of the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-station screw tightening device, characterized in that: It comprises a frame (25), an upper base plate (4) fixed to the middle of the frame (25), a lower base plate fixed to the bottom of the frame (25), and two screw tightening stations installed on the top surface of the upper base plate (4); Each screw tightening station comprises a sliding fork positioning fixture (5), a base (22), a lifting cylinder (15), a slide rail (11), a slider (27), a sliding seat (8) and three tightening guns (16); the sliding fork positioning fixture (5) is fixed to the top surface of the base plate and is provided with a sliding fork positioning hole (5.9) and three nut positioning holes (5.10); the upper base plate (4) is provided with a through hole corresponding to the sliding fork positioning hole (5.9); the base (22) is vertically fixed to the rear side of the sliding fork positioning fixture (5), the slide rail (11) is vertically installed on the front side of the base (22), the sliding seat (8) is installed on the slide rail (11) through the slider (27), the top of the sliding seat (8) is horizontally fixed with a sliding base plate (9), the lifting cylinder (15) is vertically fixed to the upper end of the base (22), the top rod of the lifting cylinder (15) is arranged downward and connected to the sliding seat (8), driving the sliding seat (8) to vertically lift along the slide rail (11); Three tightening guns (16) are vertically mounted on the sliding base plate (9), the gun heads (7) are cantilevered downward and correspond one to one with the three nut positioning holes (5.10) on the sliding fork positioning fixture (5), an annular magnet is arranged on the gun head (7), and a clearance opening (8.1) for avoiding the sliding fork (5.1) is provided on the sliding base plate (9), the clearance opening (8.1) is located in the middle of the three tightening guns (16), and corresponds to the sliding fork positioning hole (5.9) in the upper and lower directions; The sliding fork positioning tool (5) comprises a sliding fork base (5.2) and three pairs of auxiliary positioning members (5.8) and three positioning pins (5.7) mounted thereon; the sliding fork base (5.2) is fixed to the top surface of the upper base plate (4); the sliding fork positioning hole (5.9) is provided on the sliding fork base (5.2) in the vertical direction; the mounting holes of the three pairs of auxiliary positioning members (5.8) and the three positioning pin mounting holes are arranged in a spaced relationship and are evenly arranged in a circle around the sliding fork positioning hole (5.9); a spacing is maintained between the two auxiliary positioning members (5.8) of each pair of auxiliary positioning members (5.8) so as to accommodate the connection part of the triangular plate (5.3); and the sliding fork base (5.2) is provided with the nut positioning hole (5.10) between the two auxiliary positioning members (5.8); the nut positioning hole (5.10) corresponds to the connection hole (5.3.1) of the connection part of the triangular plate (5.3).

2. A double-station screw tightening device according to claim 1, characterized in that: The auxiliary positioning member (5.8) is a hexagon socket bolt.

3. A double-station screw tightening device according to claim 1, characterized in that: The upper end of the positioning pin (5.7) is conical or truncated cone-shaped.

4. A double-station screw tightening device according to claim 1, characterized in that: The three tightening guns (16) are respectively mounted on the sliding base plate (9) via adjustment mechanisms, each adjustment mechanism comprising a connecting block (29), a connecting seat (18), a pressing block (10) and an adjustment assembly; The top surface of the sliding bottom plate (9) is provided with three guide grooves (30), the three guide grooves (30) being centered on the radially parallel axis of the sliding fork positioning hole (5.9) and arranged at equal angles in a horizontal plane; The connecting block (29) is slidably engaged in the guide groove (30), and two sides of the connecting block (29) are respectively pressed by pressing blocks (10); The tightening gun (16) is vertically fixed to the inner end of the connecting block (29), and a mounting opening (29.1) for the tightening gun (16) is provided on the sliding base plate (9); The connecting seat (18) is fixed to the outer end of the connecting block (29), and the adjusting assembly is mounted on the sliding base plate (9) and connected to the connecting seat (18). The connecting seat (18) applies force to the connecting block (29), so that the connecting block (29) drives the tightening gun (16) to slide in the guide groove (30).

5. A double-station screw tightening device according to claim 4, characterized in that: The adjusting assembly comprises an adjusting screw (20), an adjusting nut (17), a bearing 21, and a fixing seat (19). The adjusting nut (17) is fixed on a connecting block (29). The fixing seat (19) is fixed on a sliding base plate (9) and is located at an outer end of a guide groove (30). The adjusting screw (20) is rotatably mounted on the fixing seat (19) via the bearing 21. The adjusting screw (20) cooperates with the adjusting nut (17). When the adjusting screw (20) is rotated, the adjusting nut (17) drives the connecting block (29) and a tightening gun (16) mounted on the connecting block (29) to slide in the guide groove (30) via the connecting seat (18).

6. A double-station screw tightening device according to claim 1, characterized in that: One of the two screw tightening stations is provided with a workpiece ejection mechanism, which is arranged on the lower base plate and located below the sliding fork positioning fixture (5), and comprises a vertically arranged cylinder support base (1), an ejection guide sleeve (3) fixed to the top of the cylinder support base (1), and an ejection cylinder (2) vertically fixed to the cylinder support base (1), the ejection guide sleeve (3) being provided with a bell mouth, the bell mouth being coaxial with the sliding fork positioning hole (5.9), the large end of the bell mouth being arranged upward, and the ejector rod of the ejection cylinder (2) being vertically upward and extending from the small end at the bottom of the bell mouth into the bell mouth.

7. The double-station screw tightening device according to claim 1, characterized in that: The upper and lower ends of the slide rail (11) are respectively provided with buffers (14); an upper limit block (12) is fixed to the upper end of the slide rail (11) to limit the height of the upper limit position of the slide seat (8); a lower limit screw (23) is provided at the lower end of the slide rail (11); the lower limit screw (23) is vertically fixed to the upper base plate (4) through the lower limit block (6); and the height of the lower limit position of the slide seat (8) is adjusted through the lower limit screw (23).

8. The double-station screw tightening device according to claim 1, characterized in that: The tightening gun (16) is connected to a control machine via a cable, and a screen of the control machine displays the torque of the tightening gun (16).

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