A multi-station screw locking device

Abstract

The present invention discloses a multi-station screw locking device, characterized in that it comprises a frame, a workbench, a product positioning mechanism and a screw locking mechanism, the screw locking mechanism comprises a mounting plate, a driving mechanism and multiple groups of electric screwdrivers, the multiple groups of electric screwdrivers are mounted on the mounting plate, and the bottom of the electric screwdriver is provided with an electric screwdriver head; the product positioning mechanism comprises a support plate, a longitudinal cylinder and a support block, the top surface of the workbench is provided with a longitudinal slide rail, the bottom of the support plate is slidably arranged on the longitudinal slide rail, the longitudinal cylinder pushes the support plate to move forward and backward, the middle part of the bottom surface of the support block is rotatably connected to the top surface of the support plate via a rotating shaft, the top of the support block is provided with a product positioning groove, and a pushing mechanism is provided on the support plate beside the support block, and the pushing mechanism pushes the support block to rotate. The present invention improves the efficiency of screw locking and reduces the cost.

Description

Technical Field

[0001] The invention relates to a screw machine, in particular to a multi-station screw locking device. Background Art

[0002] When tightening screws on a product, a screw machine is generally used. There are multiple screw positions on the product. If a set of electric screwdrivers is used to tighten the screws, the efficiency is relatively low. If multiple electric screwdrivers are used to tighten the screws, the electric screwdrivers occupy a certain position, making it impossible to tighten the screws in places close to the screw positions. The screw machine needs to be replaced to tighten the screws, which is inefficient and costly. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-station screw locking device, by using the structure, the screw locking efficiency is improved and the cost is reduced.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a multi-station screw locking device, comprising a frame, a workbench arranged on the frame, a product positioning mechanism and a screw locking mechanism arranged on the workbench, wherein the screw locking mechanism is arranged directly above the product positioning mechanism;

[0005] The screw locking mechanism includes a mounting plate, a driving mechanism and multiple groups of electric screwdrivers, wherein the multiple groups of electric screwdrivers are mounted on the mounting plate, and electric screwdriver heads are arranged at the bottom of the electric screwdrivers, and the electric screwdriver heads are arranged directly below the mounting plate, and a screw feeding tube is arranged on the side of the bottom of each group of electric screwdriver heads, respectively, and the driving mechanism drives the mounting plate to move up and down;

[0006] The product positioning mechanism includes a support plate, a longitudinal cylinder and a support block. A longitudinal slide rail is provided on the top surface of the workbench. The bottom of the support plate is slidably arranged on the longitudinal slide rail. The longitudinal cylinder is arranged parallel to the side of the longitudinal slide rail. The output shaft of the longitudinal cylinder is connected to the rear side of the support plate. The longitudinal cylinder pushes the support plate to move forward and backward. The middle part of the bottom surface of the support block is rotatably connected to the top surface of the support plate via a rotating shaft. A product positioning groove is provided on the top of the support block. A pushing mechanism is provided on the support plate beside the support block. The pushing mechanism pushes the support block to rotate.

[0007] In the above technical solution, the pushing mechanism includes a pushing cylinder and a connecting plate, a protrusion is provided on the top right side of the support plate, the pushing cylinder is installed on the right side surface of the protrusion, and the protrusion is arranged close to the rear side of the support plate; a notch is provided on the top rear side of the support block, the right side of the notch is connected to the right side surface of the support block, the left side of the connecting plate is rotatably connected to the bottom of the notch, and the output shaft on the left side of the pushing cylinder is rotatably connected to the right side of the connecting plate.

[0008] In the above technical solution, the left side of the connecting plate is rotatably connected to the notch via a vertical rod, the connecting plate is arranged parallel to the top surface of the supporting plate, a strip through groove is provided on the top of the connecting plate, the strip through groove is arranged on the right side of the vertical rod, the output shaft of the pushing cylinder is arranged perpendicular to the right side surface of the supporting plate, a push rod is provided on the output shaft on the left side of the pushing cylinder, the push rod is arranged perpendicular to the top surface of the supporting plate, the bottom of the push rod is inserted in the strip through groove, and the diameter of the push rod is smaller than the length of the strip through groove; the length of the strip through groove is smaller than the extended length of the output shaft of the pushing cylinder.

[0009] In the above technical solution, the driving mechanism includes a vertical cylinder and two groups of first vertical guide rods. The two groups of the first vertical guide rods are vertically installed on the workbench on the rear side of the support plate. The vertical cylinder is installed on the frame above the workbench. The two ends of the rear side of the mounting plate are slidably arranged on the two groups of the first vertical guide rods. The output shaft at the bottom of the vertical cylinder is connected to the top rear side of the mounting plate, and the vertical cylinder pushes the mounting plate to move up and down.

[0010] In the above technical scheme, an intermediate plate is also provided between the mounting plate and the supporting block, and the two sides of the rear end of the intermediate plate are respectively slidably arranged on the two groups of first vertical guide rods, and two groups of second vertical guide rods are provided on the top rear side of the intermediate plate, and two groups of second through holes are provided on the mounting plate, and the top of each group of second vertical guide rods passes through a group of second through holes and is arranged directly above the mounting plate; a limiting nut is screwed on the top of the second vertical guide rod, and the limiting nut is arranged above the mounting plate, and a spring is sleeved on each group of the second vertical guide rods, and the top of the spring abuts on the bottom surface of the mounting plate, and the bottom of the spring abuts on the top surface of the intermediate plate, and the spring pushes the intermediate plate and the second vertical guide rod to move downward, so that the limiting nut abuts on the top surface of the mounting plate.

[0011] In the above technical solution, multiple groups of screw feeding chucks are installed on the middle plate, the screw feeding tubes are connected to the screw feeding chucks, each group of the screw feeding chucks is arranged directly below a group of the electric screwdrivers, and the electric screwdriver heads at the bottom of each group of the electric screwdrivers are movably inserted into the corresponding screw feeding chucks.

[0012] In the above technical solution, a bracket is provided on the top rear side of the mounting plate, and the bracket is arranged between two groups of the second through holes; the output shaft at the bottom of the vertical cylinder is connected to the bracket via a connecting mechanism.

[0013] In the above technical solution, the bracket includes a U-shaped plate opening downward, and a cavity is formed between the U-shaped plate and the mounting plate; a clearance hole is provided at the top of the U-shaped plate, and the bottom of the connecting mechanism is inserted into the cavity through the clearance hole; the connecting mechanism includes a vertical rod, an upper nut, a lower nut and a connecting spring, the top of the vertical rod is connected to the bottom of the vertical cylinder, the bottom of the vertical rod is inserted into the cavity through the clearance hole, and the vertical rod is movably inserted into the clearance hole; the upper nut and the lower nut are screwed to the outside of the vertical rod, the upper nut is arranged above the U-shaped plate, the lower nut is arranged in the cavity, the connecting spring is sleeved on the outside of the vertical rod, the top of the connecting spring is against the bottom surface of the upper nut, the bottom of the connecting spring is against the top surface of the U-shaped plate, and the connecting spring pushes the U-shaped plate and the mounting plate to move downward, so that the lower nut is against the top surface of the cavity.

[0014] In the above technical solution, a middle hole is provided in the middle of the middle plate, and each group of the screw feeding chucks is installed in the middle hole through a mounting member; a mounting protrusion is provided on the top of the middle plate, and the mounting protrusion is arranged on the side of the middle hole; a positioning plate is provided directly above the middle hole, and the outer end of the positioning plate is connected to the top of the mounting protrusion; the positioning plate is arranged parallel to the top surface of the middle plate, and the positioning plate is arranged between the middle plate and the mounting plate.

[0015] In the above technical scheme, a mounting hole is provided at the inner end of the positioning plate, and a pressing rod is installed in the mounting hole. The middle part of the pressing rod is movably inserted in the mounting hole, and the bottom of the pressing rod passes through the middle hole and is arranged below the middle plate. The pressing rod and the middle hole are coaxially arranged, and a pressing head is provided at the bottom of the pressing rod. The diameter of the pressing head is larger than the diameter of the pressing rod. A top nut is provided on the top of the pressing rod, and the top nut is arranged above the positioning plate; a pressing spring is provided on the outside of the pressing rod, and the top of the pressing spring is against the bottom surface of the positioning plate, and the bottom of the pressing spring is against the top surface of the pressing head, and the pressing spring pushes the pressing head and the pressing rod to move downward.

[0016] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0017] 1. The present invention uses a product positioning mechanism to place and position the product, and then uses multiple sets of electric screwdrivers to descend at the same time, and delivers screws through a screw feeding pipe. The delivered screws are screwed into the product by an electric screwdriver, and the screws are screwed synchronously through multiple sets of electric screwdrivers. Multiple sets of screw locking work can be performed simultaneously, which is efficient, good in quality, and reduces costs;

[0018] 2. The support block in the present invention can be driven to rotate a certain angle through the pushing mechanism. In this way, after the first screwing, the support block drives the product to rotate, and the screwing position can be changed, so that the screwing work of other vacant stations can be realized, the screwing efficiency is improved, the use of screw machines is reduced, and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the first embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A schematic cross-sectional structure diagram of;

[0021] Figure 3 is a schematic cross-sectional structural diagram of the intermediate transmission mechanism in the first embodiment of the present invention;

[0022] Figure 4 It is a top view of the connection between the support block and the support plate in the first embodiment of the present invention (when the output shaft of the push cylinder is retracted);

[0023] Figure 5 It is a top view of the connection between the support block and the support plate in the first embodiment of the present invention (when the output shaft of the push cylinder is extended);

[0024] Figure 6 It is a structural schematic diagram of the connection between the connecting mechanism and the U-shaped plate in the first embodiment of the present invention.

[0025] Among them: 1. Frame; 2. Workbench; 3. Mounting plate; 4. Electric screwdriver; 5. Electric screwdriver head; 6. Screw feed tube; 7. Support plate; 8. Longitudinal cylinder; 9. Support block; 10. Longitudinal slide rail; 11. Rotating shaft; 12. Product positioning groove; 13. Push cylinder; 14. Connecting plate; 15. Bump; 16. Notch; 17. Vertical pole; 18. Strip groove; 19. Push rod; 20. Right limit bolt; 21. Left bump; 22. Left limit bolt; 23. Vertical cylinder; 24. First vertical guide rod; 25. Middle plate; 26. Second vertical guide rod; 27. Limit nut; 28. Spring; 29. ​​Screw feed chuck; 30. Upper limit ring; 31. Lower limit ring; 32. U-shaped plate; 33. Cavity; 34. Vertical rod; 35. Upper nut; 36. Lower nut; 37. Connecting spring; 38. Intermediate transmission mechanism; 39. Sleeve; 40. Intermediate spring; 41. Ring; 42. Connecting hole; 43. Vertical through groove; 44. Blocking rod; 45. Intermediate hole; 46. Mounting piece; 47. Mounting bump; 48. Positioning plate; 49. Pressing rod; 50. Pressing head; 51. Top nut; 52. Pressing spring. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0027] Example 1: See Figures 1 to 6 As shown, a multi-station screw locking device includes a frame 1, a workbench 2 arranged on the frame, a product positioning mechanism and a screw locking mechanism arranged on the workbench, wherein the screw locking mechanism is arranged directly above the product positioning mechanism;

[0028] The screw locking mechanism includes a mounting plate 3, a driving mechanism and multiple groups of electric screwdrivers 4. Multiple groups of electric screwdrivers are mounted on the mounting plate. Electric screwdriver heads 5 are provided at the bottom of the electric screwdrivers. The electric screwdriver heads are arranged directly below the mounting plate. A screw feeding tube 6 is provided on the side of the bottom of each group of electric screwdriver heads. The driving mechanism drives the mounting plate to move up and down.

[0029] The product positioning mechanism includes a support plate 7, a longitudinal cylinder 8 and a support block 9. A longitudinal slide rail 10 is provided on the top surface of the workbench. The bottom of the support plate is slidably arranged on the longitudinal slide rail. The longitudinal cylinder is arranged parallel to the side of the longitudinal slide rail. The output shaft of the longitudinal cylinder is connected to the rear side of the support plate. The longitudinal cylinder pushes the support plate to move forward and backward. The middle part of the bottom surface of the support block is rotatably connected to the top surface of the support plate via a rotating shaft 11. A product positioning groove 12 is provided on the top of the support block. A pushing mechanism is provided on the support plate beside the support block. The pushing mechanism pushes the support block to rotate.

[0030] In this embodiment, taking the electric screwdriver as 3 groups as an example, there are 6 holes on the product that need to be screwed, and the adjacent 2 holes are close to each other, and each electric screwdriver will face one group of holes. When the screws are locked, the longitudinal cylinder output shaft extends to push the support plate and the support block forward, so that the support block is at the front side under the mounting plate, and then the product is placed in the product positioning groove of the support block, and then the longitudinal cylinder output shaft retracts, driving the support block to move to the bottom of the mounting plate. At this time, the 3 groups of holes will face the electric screwdriver heads of the 3 groups of electric screwdrivers, and then the driving mechanism drives the mounting plate and the electric screwdriver to descend, and the corresponding screws are tightened. The wire feeding tube will deliver a group of screws to the bottom of the electric screwdriver head, and then the electric screwdriver drives the electric screwdriver head to rotate. At the same time, the mounting plate, electric screwdriver and electric screwdriver head will descend synchronously. In this process, the electric screwdriver head will be used to lock the screws into the holes of the product, and then the driving mechanism will drive the mounting plate and the electric screwdriver to rise and detach from the product. Then the pushing mechanism will push the support block and the product to rotate a certain angle, so that the adjacent holes that have not been locked are facing the corresponding electric screwdriver. The driving mechanism continues to drive the mounting plate and the electric screwdriver to descend, and the screw feeding tube delivers a group of bolts. The electric screwdriver head locks the corresponding bolts into the holes to complete the screw locking work. Then the driving mechanism drives the mounting plate and the electric screwdriver to rise and detach from the product, and the pushing mechanism drives the support block to restore the original state. The longitudinal cylinder output shaft extends, driving the support plate and the support block to move forward. The operator takes away the product that has been screwed and replaces it with a new product to screw. Among them, the loading and unloading of products can be done manually, or a robot can be used for automatic loading and unloading.

[0031] See also Figure 1 , 2 As shown in Figures 4 and 5, the pushing mechanism includes a pushing cylinder 13 and a connecting plate 14. A protrusion 15 is provided on the right side of the top of the support plate. The pushing cylinder is installed on the right side surface of the protrusion, and the protrusion is arranged close to the rear side of the support plate. A notch 16 is provided on the rear side of the top of the support block, and the right side of the notch is connected to the right side surface of the support block. The left side of the connecting plate is rotatably connected to the bottom of the notch, and the output shaft on the left side of the pushing cylinder is rotatably connected to the right side of the connecting plate.

[0032] The left side of the connecting plate is rotatably connected to the notch via a vertical rod 17, the connecting plate is arranged parallel to the top surface of the supporting plate, a strip through groove 18 is arranged on the top of the connecting plate, the strip through groove is arranged on the right side of the vertical rod, the output shaft of the pushing cylinder is arranged perpendicular to the right side surface of the supporting plate, a push rod 19 is arranged on the output shaft on the left side of the pushing cylinder, the push rod is arranged perpendicular to the top surface of the supporting plate, the bottom of the push rod is inserted in the strip through groove, and the diameter of the push rod is smaller than the length of the strip through groove; the length of the strip through groove is smaller than the extended length of the output shaft of the pushing cylinder.

[0033] In this embodiment, when the output shaft of the push cylinder is extended and retracted, the support block will be driven to rotate a certain angle through the connecting plate, and this rotation angle is equal to the rotation angle of the screw hole position required for the product to be replaced. Among them, the position of the push cylinder is unchanged and cannot be rotated. Therefore, the connecting plate is rotatably connected to the support block through the vertical rod, and the push cylinder is connected to the bar groove on the connecting plate through the push rod. When the output shaft of the push cylinder is extended and retracted, it will move in the bar groove. The stroke of the extension and retraction of the output shaft of the push cylinder will be greater than the length of the bar groove. Therefore, when the output shaft of the push cylinder is extended and retracted, the push rod will first move in the bar groove and drive the connecting rod to rotate around the vertical rod. When the push rod is against the end of the bar groove, the push rod will pull the connecting plate to rotate in the moving direction of the push cylinder output shaft downward. Since the left end of the connecting plate is rotatably connected through the vertical rod, the connecting plate will drive the support block to rotate around the rotating shaft through the vertical rod, so that the support block rotates a corresponding angle, thereby driving the product to rotate a corresponding angle.

[0034] In this embodiment, a group of right-side limit bolts 20 will be screwed on the protrusion, and the right-side limit bolt is set opposite to the support block. When the cylinder output shaft is pushed to retract, the support block will abut against the left end face of the right-side limit bolt to limit the clockwise rotation of the support block. Among them, a left-side protrusion 21 will be set on the left side of the top of the support plate, and a group of left-side limit bolts 22 will be screwed on the left-side protrusion. The left-side limit bolt is set opposite to the connecting plate. When the cylinder output shaft is pushed to extend, the connecting plate will abut against the right end face of the left-side limit bolt to prevent the connecting plate from continuing to rotate, blocking the connecting plate and preventing the support block from rotating, so as to limit the counterclockwise rotation of the support block. In this way, the left-side limit bolt and the right-side limit bolt are used to limit the rotation of the support block, so as to ensure that the rotation angle of the support block is limited, and to ensure that after the rotation, the hole on the product will face the electric screwdriver, so as to ensure the stability and quality of the locking screw.

[0035] See also Figure 1 , 2 As shown, the driving mechanism includes a vertical cylinder 23 and two groups of first vertical guide rods 24. The two groups of first vertical guide rods are vertically installed on the workbench on the rear side of the support plate. The vertical cylinder is installed on the frame above the workbench. The two ends of the rear side of the mounting plate are slidably arranged on the two groups of first vertical guide rods. The output shaft at the bottom of the vertical cylinder is connected to the top rear side of the mounting plate, and the vertical cylinder pushes the mounting plate to move up and down.

[0036] The mounting plate is slidably connected to the first vertical guide rod via a linear bearing to ensure smooth sliding.

[0037] See also Figure 1 , 2As shown, an intermediate plate 25 is also provided between the mounting plate and the support block, and the two sides of the rear end of the intermediate plate are respectively slidably arranged on the two groups of the first vertical guide rods, and two groups of second vertical guide rods 26 are provided on the top rear side of the intermediate plate, and two groups of second through holes are provided on the mounting plate, and the top of each group of the second vertical guide rods passes through a group of the second through holes and is arranged directly above the mounting plate; a limiting nut 27 is screwed on the top of the second vertical guide rod, and the limiting nut is arranged above the mounting plate, and a spring 28 is sleeved on each group of the second vertical guide rods, and the top of the spring abuts on the bottom surface of the mounting plate, and the bottom of the spring abuts on the top surface of the intermediate plate, and the spring pushes the intermediate plate and the second vertical guide rod to move downward, so that the limiting nut abuts on the top surface of the mounting plate. Among them, the intermediate plate is also slidably connected to the first vertical guide rod through a linear bearing, and the second vertical guide rod is slidably connected to the mounting plate through a linear bearing, so as to ensure the smoothness and stability of movement and prevent the occurrence of jamming.

[0038] A plurality of groups of screw feeding chucks 29 are installed on the middle plate, and the screw feeding tubes are connected to the screw feeding chucks. Each group of the screw feeding chucks is arranged directly below a group of the electric screwdrivers, and the electric screwdriver heads at the bottom of each group of the electric screwdrivers are movably inserted into the corresponding screw feeding chucks.

[0039] In this embodiment, an upper limit ring 30 and a lower limit ring 31 are arranged on the first vertical guide rod. The upper limit ring is arranged between the middle plate and the mounting plate, and the lower limit ring is arranged below the middle plate. The distance between the upper limit ring and the lower limit ring is smaller than the distance between the mounting plate and the middle plate (when the spring is extended).

[0040] In this embodiment, the screw feeding tube feeds the screw into the screw feeding chuck, so that the screw is in the screw feeding chuck below the electric screwdriver head. When the screw needs to be locked, the vertical cylinder drives the mounting plate, the electric screwdriver, and the electric screwdriver head to descend. In this process, the spring will synchronously push the middle plate to move downward synchronously along the first vertical guide rod. After the middle plate hits the lower limit ring, the middle plate cannot continue to descend, that is, the position of the screw feeding chuck no longer descends and will be above the screw hole position of the product that needs to be locked. The mounting plate continues to descend, compressing the spring, and the electric screwdriver head descends during the rotation process, rotating and pressing the screw in the screw feeding chuck downward, so that the screw is separated from the screw feeding chuck and screwed with the product to complete the screw connection. After the screw connection is completed, the vertical cylinder output shaft retracts, driving the mounting plate and the middle plate to rise, and then pushing the cylinder output shaft to extend, driving the support block and the product to rotate, so that the product hole is facing the electric screwdriver, and then the vertical cylinder output shaft continues to extend, repeating the above work until the screw locking work of another group of screws is completed. Each time the mounting plate is lowered, the screw feed tube delivers a set of screws to the screw feed chuck for locking the screws.

[0041] See also Figure 1 , 2 As shown in Figure 6, a bracket is provided on the top rear side of the mounting plate, and the bracket is arranged between the two groups of the second through holes; the output shaft at the bottom of the vertical cylinder is connected to the bracket via a connecting mechanism.

[0042] The bracket includes a U-shaped plate 32 which opens downward, and a cavity 33 is formed between the U-shaped plate and the mounting plate; a clearance hole is provided at the top of the U-shaped plate, and the bottom of the connecting mechanism is inserted into the cavity through the clearance hole; the connecting mechanism includes a vertical rod 34, an upper nut 35, a lower nut 36 and a connecting spring 37, the top of the vertical rod is connected to the bottom of the vertical cylinder, the bottom of the vertical rod is inserted into the cavity through the clearance hole, and the vertical rod is movably inserted into the clearance hole; the upper nut and the lower nut are screwed to the outside of the vertical rod, the upper nut is arranged above the U-shaped plate, the lower nut is arranged in the cavity, the connecting spring is sleeved on the outside of the vertical rod, the top of the connecting spring is against the bottom surface of the upper nut, the bottom of the connecting spring is against the top surface of the U-shaped plate, and the connecting spring pushes the U-shaped plate and the mounting plate to move downward, so that the lower nut is against the top surface of the cavity.

[0043] In this embodiment, when the mounting plate is pressed down, the spring will be compressed first. When it is compressed to a certain extent, the rebound force of the spring will be greater than the elastic force of the connecting spring. At this time, the electric screwdriver head will drop to a certain position, contact the bolt with the hole of the product, and is about to lock the screw. At this time, the output shaft of the vertical cylinder will drive the vertical rod to drop, compress the connecting spring, and push the mounting plate to slowly drop by the elastic force of the connecting spring, giving the locking screw a drop buffer to prevent the falling speed from being too fast, so as to ensure that the screw can be locked normally (if the mounting plate and the electric screwdriver drop too fast, but the speed of the electric screwdriver head cannot keep up with the falling speed, the screw will damage the product, or the electric screwdriver head will break, and the two cannot be synchronized, so that the locking screw cannot be completed completely). At the same time, when the mounting plate drops, it can prevent the mounting plate from quickly and rigidly colliding with the upper limit ring to generate noise and vibration, prevent vibration from affecting the normal work of the locking screw, and ensure the quality of the locking screw.

[0044] At the same time, in this embodiment, an intermediate transmission mechanism 38 is also provided between the electric screwdriver and the electric screwdriver head. The intermediate transmission mechanism includes a sleeve 39 and an intermediate spring 40. The sleeve is installed on the top of the electric screwdriver head. A collar 41 is provided on the output shaft at the bottom of the electric screwdriver. A connecting hole 42 is provided on the top of the sleeve. Two groups of vertical through grooves 43 are symmetrically provided on the outer surface of the sleeve. The vertical through grooves are connected to the connecting holes. Two groups of blocking rods 44 are symmetrically provided on the output shaft at the bottom of the electric screwdriver. The output shaft at the bottom of the electric screwdriver is inserted into the connecting hole, and each group of blocking rods is inserted into the corresponding vertical through groove 43. The collar is provided The middle spring is placed on the top of the sleeve and is sleeved on the outside of the output shaft at the bottom of the electric screwdriver. The bottom of the middle spring is against the top outer edge of the sleeve and the top is against the bottom surface of the collar. In this way, when the mounting plate drives the electric screwdriver to descend, the collar and the electric screwdriver head will be driven to rotate and descend synchronously through the blocking rod. When the electric screwdriver head drives the screw to contact the product hole to lock the screw, the electric screwdriver continues to descend, compressing the middle spring. The elastic force of the middle spring pushes the sleeve and the electric screwdriver head down, slowing down the descending speed of the electric screwdriver head and ensuring the stability and quality of the electric screwdriver head in locking the screws of the product.

[0045] See also Figure 1 , 2 As shown, a middle hole 45 is provided in the middle of the middle plate, and each group of the screw feeding chucks is installed in the middle hole through a mounting member 46; a mounting protrusion 47 is provided on the top of the middle plate, and the mounting protrusion is arranged on the side of the middle hole, and a positioning plate 48 is provided directly above the middle hole, and the outer end of the positioning plate is connected to the top of the mounting protrusion, and the positioning plate is arranged parallel to the top surface of the middle plate, and the positioning plate is arranged between the middle plate and the mounting plate.

[0046] The inner end of the positioning plate is provided with a mounting hole, and a pressing rod 49 is installed in the mounting hole. The middle part of the pressing rod is movably inserted into the mounting hole, and the bottom of the pressing rod passes through the middle hole and is arranged below the middle plate. The pressing rod and the middle hole are coaxially arranged, and a pressing head 50 is provided at the bottom of the pressing rod. The diameter of the pressing head is larger than the diameter of the pressing rod. A top nut 51 is provided at the top of the pressing rod, and the top nut is arranged above the positioning plate; a pressing spring 52 is provided on the outside of the pressing rod, and the top of the pressing spring is against the bottom surface of the positioning plate, and the bottom of the pressing spring is against the top surface of the pressing head, and the pressing spring pushes the pressing head and the pressing rod to move downward.

[0047] Through the setting of the pressing rod and the pressing spring, when the middle plate descends, the pressure head can first rest on the top surface of the product to press the product, and use the pressure of the pressing spring to press the product tightly against the support block. The middle plate continues to descend without causing damage to the product. The middle plate will not contact the product, ensuring that the product will not jump during the screw locking process, thereby ensuring the stability and quality of the screw locking.

Claims

1. A multi-station screw locking device, characterized in that: It includes a frame, a workbench arranged on the frame, a product positioning mechanism and a screw locking mechanism arranged on the workbench, wherein the screw locking mechanism is arranged directly above the product positioning mechanism; The screw locking mechanism includes a mounting plate, a driving mechanism and multiple groups of electric screwdrivers, wherein the multiple groups of electric screwdrivers are mounted on the mounting plate, and electric screwdriver heads are arranged at the bottom of the electric screwdrivers, and the electric screwdriver heads are arranged directly below the mounting plate, and a screw feeding tube is arranged on the side of the bottom of each group of electric screwdriver heads, respectively, and the driving mechanism drives the mounting plate to move up and down; The product positioning mechanism includes a support plate, a longitudinal cylinder and a support block. A longitudinal slide rail is provided on the top surface of the workbench. The bottom of the support plate is slidably arranged on the longitudinal slide rail. The longitudinal cylinder is arranged parallel to the side of the longitudinal slide rail. The output shaft of the longitudinal cylinder is connected to the rear side of the support plate. The longitudinal cylinder pushes the support plate to move forward and backward. The middle part of the bottom surface of the support block is rotatably connected to the top surface of the support plate via a rotating shaft. A product positioning groove is provided on the top of the support block. A pushing mechanism is provided on the support plate beside the support block. The pushing mechanism pushes the support block to rotate. The pushing mechanism includes a pushing cylinder and a connecting plate, a convex block is provided on the right side of the top of the supporting plate, the pushing cylinder is installed on the right side surface of the convex block, and the convex block is arranged close to the rear side of the supporting plate; a notch is provided on the rear side of the top of the supporting block, the right side of the notch is connected to the right side surface of the supporting block, the left side of the connecting plate is rotatably connected to the bottom of the notch, and the output shaft on the left side of the pushing cylinder is rotatably connected to the right side of the connecting plate; The driving mechanism includes a vertical cylinder and two groups of first vertical guide rods, the two groups of the first vertical guide rods are vertically installed on the workbench on the rear side of the support plate, the vertical cylinder is installed on the frame above the workbench, the two ends of the rear side of the mounting plate are slidably arranged on the two groups of the first vertical guide rods, the output shaft at the bottom of the vertical cylinder is connected to the top rear side of the mounting plate, and the vertical cylinder pushes the mounting plate to move up and down; An intermediate plate is also provided between the mounting plate and the supporting block, and the rear ends of the intermediate plate are respectively slidably arranged on the two groups of first vertical guide rods, and the top rear side of the intermediate plate is provided with two groups of second vertical guide rods, and the mounting plate is provided with two groups of second through holes, and the top of each group of second vertical guide rods passes through a group of second through holes and is arranged directly above the mounting plate; a limiting nut is screwed on the top of the second vertical guide rod, and the limiting nut is arranged above the mounting plate, and a spring is sleeved on each group of the second vertical guide rods, the top of the spring is against the bottom surface of the mounting plate, and the bottom of the spring is against the top surface of the intermediate plate, and the spring pushes the intermediate plate and the second vertical guide rod to move downward, so that the limiting nut is against the top surface of the mounting plate; A plurality of groups of screw feeding chucks are installed on the middle plate, the screw feeding tubes are connected to the screw feeding chucks, each group of the screw feeding chucks is arranged directly below a group of the electric screwdrivers, and the electric screwdriver heads at the bottom of each group of the electric screwdrivers are movably inserted into the corresponding screw feeding chucks.

2. The multi-station screw locking device according to claim 1 is characterized in that: The left side of the connecting plate is rotatably connected to the notch via a vertical rod, the connecting plate is arranged parallel to the top surface of the supporting plate, a strip through groove is provided on the top of the connecting plate, the strip through groove is arranged on the right side of the vertical rod, the output shaft of the pushing cylinder is arranged perpendicular to the right side surface of the supporting plate, a push rod is provided on the output shaft on the left side of the pushing cylinder, the push rod is arranged perpendicular to the top surface of the supporting plate, the bottom of the push rod is inserted in the strip through groove, and the diameter of the push rod is smaller than the length of the strip through groove; the length of the strip through groove is smaller than the protruding length of the output shaft of the pushing cylinder.

3. The multi-station screw locking device according to claim 1 is characterized in that: A bracket is provided on the rear side of the top of the mounting plate, and the bracket is arranged between the two groups of the second through holes; the output shaft at the bottom of the vertical cylinder is connected to the bracket via a connecting mechanism.

4. The multi-station screw locking device according to claim 3 is characterized in that: The bracket comprises a U-shaped plate opening downward, and a cavity is formed between the U-shaped plate and the mounting plate; a clearance hole is provided at the top of the U-shaped plate, and the bottom of the connecting mechanism is inserted into the cavity through the clearance hole; the connecting mechanism comprises a vertical rod, an upper nut, a lower nut and a connecting spring, the top of the vertical rod is connected to the bottom of the vertical cylinder, the bottom of the vertical rod is inserted into the cavity through the clearance hole, and the vertical rod is movably inserted into the clearance hole; the upper nut and the lower nut are screwed to the outside of the vertical rod, the upper nut is arranged above the U-shaped plate, the lower nut is arranged in the cavity, the connecting spring is sleeved on the outside of the vertical rod, the top of the connecting spring abuts on the bottom surface of the upper nut, the bottom of the connecting spring abuts on the top surface of the U-shaped plate, and the connecting spring pushes the U-shaped plate and the mounting plate to move downward, so that the lower nut abuts on the top surface of the cavity.

5. The multi-station screw locking device according to claim 1 is characterized in that: A middle hole is provided in the middle of the middle plate, and each group of the screw feeding chucks is installed in the middle hole through a mounting piece; a mounting protrusion is provided on the top of the middle plate, and the mounting protrusion is arranged beside the middle hole; a positioning plate is provided directly above the middle hole, and the outer end of the positioning plate is connected to the top of the mounting protrusion; the positioning plate is arranged parallel to the top surface of the middle plate, and the positioning plate is arranged between the middle plate and the mounting plate.

6. The multi-station screw locking device according to claim 5, characterized in that: The inner end of the positioning plate is provided with a mounting hole, and a pressing rod is installed in the mounting hole. The middle part of the pressing rod is movably inserted into the mounting hole, and the bottom of the pressing rod passes through the middle hole and is arranged below the middle plate. The pressing rod and the middle hole are coaxially arranged, and a pressing head is provided at the bottom of the pressing rod. The diameter of the pressing head is larger than the diameter of the pressing rod. A top nut is provided on the top of the pressing rod, and the top nut is arranged above the positioning plate; a pressing spring is sleeved on the outside of the pressing rod, and the top of the pressing spring is against the bottom surface of the positioning plate, and the bottom of the pressing spring is against the top surface of the pressing head, and the pressing spring pushes the pressing head and the pressing rod to move downward.

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