High-precision straight column toggle connecting rod rocker punch press

Abstract

The present invention discloses a high-precision straight-column toggle-connecting-rod rocker punch press, which relates to the technical field of punch press mechanical equipment, and comprises a frame and a slider connected thereto via a driving mechanism, wherein the driving mechanism comprises a driving motor, a crankshaft, a crankshaft connecting rod, an upper toggle connecting rod, a lower toggle connecting rod, and an toggle pin. A containing shell is embedded in the frame at one side of the upper toggle connecting rod, and a buffer assembly connected to the toggle pin is arranged in the containing shell, the buffer assembly comprises a fitting ring sleeved on the outer wall of the toggle pin, a transit ring and a pressure cover located in the containing shell, a push rod is arranged on the pressure cover, the push rod passes through the transit ring and is connected to the fitting ring, a protrusion is arranged at the side end of the slider, and a positioning mechanism for limiting the position of the protrusion is arranged outside the protrusion. Aiming at the situation that the position of the traditional slider is easily offset and the precision is reduced after being worn, the present invention can make the slider maintain good parallelism and verticality when moving up and down.

Description

Technical Field

[0001] The invention relates to the technical field of punching machine mechanical equipment, in particular to a high-precision straight column type toggle connecting rod rocker arm punching machine. Background Art

[0002] There are many types of mechanical punching machines, and the straight column toggle punching machine is one of them. It can keep the upper die in gentle contact with the lower die for a long time when the product is punching. It usually consists of a frame, a slider installed on the frame and capable of being raised and lowered, and a driving device for generating and applying a driving force to raise and lower the slider. Its characteristic is that as the bottom dead point is approached, the movement speed of the slider will gradually slow down, so it is very suitable for compression processing, stamping, forging, stamping, forging, shaping and other processing.

[0003] In the traditional straight column toggle punch press, a balancing cylinder is arranged on the left and right sides of the slider to balance the weight of the slider. An upper toggle connecting rod and a lower toggle connecting rod are also arranged in the middle of the slider, which are connected by a toggle pin. At the same time, the two connect the slider, the crankshaft and the crankshaft connecting rod, so that the rotational motion of the crankshaft can be converted into the motion of the toggle connecting rod rocker arm, and then the slider can move up and down. Therefore, it is subdivided into a straight column toggle connecting rod rocker arm punch press. In the existing straight column toggle connecting rod rocker arm punch press, when the slider moves up and down, the slider will drive the equipment to produce a certain vibration, which will cause the upper and lower sets of toggle connecting rods to vibrate during the movement. A certain amount of shaking will be generated, and the movement of the rocker arm will have a certain position offset, which will cause the original up and down movement of the slider connected to it to shake, and the stamping accuracy will gradually decrease. In addition, the toggle pin used to connect the upper toggle link and the lower toggle link will be subjected to greater force and wear faster during the long-term stamping process. The upper toggle link and the lower toggle link cannot be precisely linked, and the transmission performance will gradually decrease, resulting in a large delay in the up and down movement of the slider connected to it, increasing the inertia of the slider when it falls, causing an inclination angle during the descent, which is easy to cause offset during stamping and reduces the accuracy. Summary of the invention

[0004] The purpose of the present invention is to provide a high-precision straight column type toggle connecting rod rocker punch press, which can keep good parallelism and verticality when the slider moves up and down.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a high-precision straight column toggle connecting rod rocker arm punch press, comprising a frame and a slider connected thereto through a driving mechanism, the driving mechanism comprising a driving motor, a crankshaft, a crank connecting rod, an upper toggle connecting rod, a lower toggle connecting rod, and a toggle pin, the driving motor is arranged outside the frame, one end of which is connected to the crankshaft, the crankshaft is connected to the toggle pin through the crank connecting rod, one end of the upper toggle connecting rod is rotatably connected to the frame, and the other end of the upper toggle connecting rod is rotatably connected to the lower toggle connecting rod through the toggle pin, a containing shell is embedded in one side of the upper toggle connecting rod on the frame, and a buffer assembly is arranged in the containing shell and is connected to one end of the toggle pin, the buffer assembly comprises a fitting ring sleeved on the outer wall of the toggle pin, a transit ring and a pressure cover located in the containing shell, a push rod is arranged on the pressure cover, the push rod passes through the transit ring and is connected to the fitting ring, a protrusion is arranged on the side end of the slider, and the protrusion A positioning mechanism is arranged on the outside, and the positioning mechanism includes a positive limit assembly and a side limit assembly, the positive limit assembly includes a top plate and a driving member 1 that can be fitted with the surface of the protrusion, the side limit assembly includes a side plate arranged on the side of the protrusion and a rack connected thereto and a driving member 2 arranged outside the frame, the driving member 2 is provided with a gear meshing with the rack, a guide groove is provided in the accommodating shell, the elbow pin is provided with an extension rod for rotation near one end of the accommodating shell, one end of the extension rod is passed through the guide groove and is located in the accommodating shell, the transit ring is sleeved on the outer wall of the extension rod, the pressure cover is passed through a screw, the extension rod is provided with a threaded hole screwed with the screw, a roller is provided in the guide groove, and a shock absorbing assembly is provided in the accommodating shell, the shock absorbing assembly includes a guide platform arranged under the transit ring and a buffer spring connecting it with the accommodating shell.

[0006] Preferably, a sliding block is provided on a side of the guide platform away from the transit ring, a guide block is provided in the accommodating shell, and the sliding block is connected to the guide block in an up-and-down sliding manner.

[0007] Preferably, a plurality of groups of balls are arranged equidistantly along the height of the guide block, and sliding grooves are arranged on both sides of the slide block.

[0008] Preferably, the accommodating shell and the shock absorbing assembly therein and the buffer assembly are each provided with two groups, which are arranged oppositely on both sides of the wrist pin.

[0009] Preferably, the protrusions are provided in two groups, which are arranged on both sides of the slider relatively, and the positioning mechanisms are provided in two groups, which are arranged on both sides of the slider relatively, and are respectively limitedly matched with the two groups of protrusions.

[0010] Preferably, a support platform is provided in the frame below the crankshaft, and a rotating wheel is provided on the support platform.

[0011] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention uses protrusions on the left and right sides of the slider and a positioning mechanism opposite to the protrusions on the frame, and the positive limit assembly and the side limit assembly of the positioning mechanism indirectly reduce the displacement caused by the slider shaking by limiting the protrusions, so that the movement of the slider is smoother than that in the shaking state, the accuracy of the up and down reciprocating motion of the slider is improved, the impact displacement on the mold during stamping is reduced, and the stamping accuracy is improved. At the same time, a containing shell is provided at both ends of the toggle pin, and the shock absorbing assembly in the containing shell indirectly supports the toggle pin through the extension rod. During the stamping process of the equipment, the movement of the toggle pin is The tension on the toggle pin is buffered and shared at the same time, the wear rate of the toggle pin is reduced, the replacement frequency and the overall cost are reduced, and the overall service life is extended. At the same time, the fitting ring sleeved on the outer wall of the toggle pin is used, and the screw is adjusted by the personnel to push it to fit at the connection between the upper toggle link and the lower toggle link, so as to limit the position deviation of the upper toggle link and the lower toggle link at the connection of the toggle pin. During a long period of stamping process, the upper toggle link or the lower toggle link can be limited in time when the motion trajectory changes due to shaking, thereby reducing the reduction in stamping accuracy, thereby reducing the qualified rate of stamping workpieces during assembly line stamping work. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram for showing a partial mechanism of the outer part of the frame in one embodiment of the present invention;

[0013] Figure 2 This is a schematic diagram of a structure for displaying the top of the frame in one embodiment of the present invention;

[0014] Figure 3 for Figure 2 A schematic diagram of the structure cut along the AA direction;

[0015] Figure 4 This is an exploded view for separately showing the positioning mechanism in one embodiment of the present invention;

[0016] Figure 5 An exploded view for showing a part of the mechanism of a buffer assembly in one embodiment of the present invention;

[0017] Figure 6 An exploded view for showing a part of the mechanism of a shock absorbing assembly in one embodiment of the present invention;

[0018] Figure 7 for Figure 6 A magnified view of part B;

[0019] Figure 8 It is a schematic structural diagram for separately displaying a support platform and its inner rotating wheel in one embodiment of the present invention.

[0020] Figure numerals: 1. frame; 2. containing shell; 3. slider; 4. driving motor; 5. bump; 6. gear; 7. driving member 1; 8. rack; 9. side plate; 10. top plate; 11. driving member 2; 12. elbow pin; 13. lower elbow connecting rod; 14. extension rod; 15. threaded hole; 16. push rod; 17. intermediate ring; 18. guide groove; 19. guide table; 20. roller; 21. screw; 22. pressure cover; 23. fitting ring; 24. crankshaft; 25. crankshaft connecting rod; 26. upper elbow connecting rod; 27. buffer spring; 28. guide block; 29. ​​sliding block; 30. ball; 31. slide groove; 32. rotating wheel; 33. supporting table. DETAILED DESCRIPTION

[0021] The following is only a preferred embodiment of the present invention, and the protection scope is not limited to this embodiment. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention. At the same time, it should be pointed out that for ordinary technicians in this technical field, several improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

[0022] It should be noted that, in this article, relational terms such as first and second, such as "drive one, drive two", etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0023] The directional words mentioned in this embodiment, such as "up, down, left, right", etc., are only used in conjunction with the drawings to enable technicians in this technical field to understand the relationship between various features or parts.

[0024] like Figures 1 to 4As shown, a high-precision straight column type toggle connecting rod rocker punch comprises a frame 1. The frame 1 adopts the equipment conventionally used by technicians in the technical field, is a rectangular parallelepiped, has an opening at the front end, and a placing table (not shown in the figure) is arranged at the bottom of the opening. A U-shaped slider 3 is arranged horizontally above the placing table. The left and right ends of the upper side of the slider 3 extend into the interior of the frame 1, and the left and right ends of the upper end of the frame 1 are vertically fixed with balancing cylinders (not shown in the figure). The top ends of the piston rods of the two sets of balancing cylinders are respectively connected to the left and right ends of the upper side of the slider 3. The ends are fixedly connected, a rectangular containing shell 2 is embedded in the front side of the upper end of the frame 1, and the opening of the containing shell 2 faces the front side of the frame 1. The outer walls of the slider 3 are respectively vertically fixed with rectangular convex blocks 5 on the left and right sides along the length direction thereof, and the two groups of convex blocks 5 are each provided with a top plate 10 that can be fitted with its surface on one side away from each other. The top plate 10 is placed vertically, and in this embodiment, a round ball (not shown in the figure) is embedded in the fitting surface of the top plate 10 and the convex block 5, the purpose of which is to reduce the friction between the convex block 5 and the top plate 10 when it moves, and the inner wall of the frame 1 A rectangular through hole is provided at a position opposite to the two groups of protrusions 5, and the length and width of the through hole are larger than the length and width of the top plate 10. The outer wall of the frame 1 is located at the upper and lower sides of the top plate 10, and a pusher 1 (driving member 1) is fixed by an L-shaped support plate (not shown in the figure). In this embodiment, the pusher 1 adopts a cylinder, and a pusher head (not shown in the figure) is fixed to the top of its piston rod, and its purpose is to contact the outer surface of the top plate 10. The top plate 10 is in an I-shape, and a rectangular side plate 9 is vertically slidably provided on the left and right sides thereof, and between the two groups of side plates 9 It is designed in parallel, and a rack 8 is fixed on each side of the two sets of side panels 9 that are close to each other, and the two sets of racks 8 are designed to be opposite to each other in the upper and lower directions. A driving member 11 is fixed on the outer wall of the top plate 10. In this embodiment, the driving member 11 adopts a traditional motor, and a gear 6 that meshes with the two sets of racks 8 is fixed on the outer wall of its output shaft. It should be noted that in this embodiment, when the pitch of the gear 6 and the rack 8 needs to be changed, it can be changed by replacing a set of suitable gears 6 and racks 8. The two sets of protrusions 5 are each matched with a top plate 10 and two left and right sets of side panels 9.

[0025] like Figures 5 to 7As shown, the upper toggle link 26 is rotatably connected to the lower toggle link 13 through the toggle pin 12, and the two ends of the toggle pin 12 are rotatably connected with the cylindrical extension rod 14 around its central axis. It should be noted that a fixed limiting ring (not shown in the drawings) is sleeved on the toggle pin 12, and its purpose is to prevent the position of the connection between the upper toggle link 26 and the lower toggle link 13 from shifting. A circular fitting ring 23 is slidably sleeved on the outer wall of the extension rod 14, and the fitting ring 23 is located between the accommodating shell 2 and the toggle pin 12. An arc-shaped guide groove 18 is opened on the inner wall of the accommodating shell 2 close to the fitting ring 23. In this embodiment, the arc angle of the guide groove 18 is consistent with the trajectory angle of the crankshaft connecting rod 25 driving the toggle pin 12 to move. A guide platform 19 is horizontally placed on one end of the interior of the accommodating shell 2 close to the guide groove 18, and the upper side of the guide platform 19 It is arc-shaped, and its arc angle is consistent with that of the guide groove 18. A plurality of groups of rollers 20 are equidistantly and rollingly embedded in the lower end of the inner wall of the guide groove 18 along the length direction of its bottom side. A circular intermediate ring 17 is vertically placed inside the accommodating shell 2. The front end of the extension rod 14 is located inside the intermediate ring 17. The lower side of the intermediate ring 17 slides in contact with the upper side of the guide platform 19. A pressure cover 22 is vertically arranged on the side of the intermediate ring 17 away from the contact ring 23. Two groups of push rods 16 are arranged in a group of three on the left side of the pressure cover 22. The two groups of push rods 16 are relatively fixed at the opposite ends of the pressure cover 22 close to the intermediate ring 17, and the end of the push rod 16 close to the extension rod 14 passes through the intermediate ring 17 and is fixed to the contact ring 23. A screw rod 21 is horizontally penetrated in the middle of the pressure cover 22, and a threaded hole 15 that is threadedly connected with the screw rod 21 is opened in the middle of the extension rod 14. Figure 6 to Figure 7 As shown, three groups of buffer springs 27 are vertically fixed to the lower side of the guide platform 19 along its length direction, and the lower ends of the buffer springs 27 are fixedly connected to the bottom end of the inner wall of the accommodating shell 2, and a guide block 28 vertically fixed to the bottom end of the inner wall of the accommodating shell 2 is arranged between two adjacent groups of buffer springs 27. The guide block 28 is U-shaped, and a slide block 29 is vertically slidably connected to its opening. A plurality of groups of balls 30 are equidistantly embedded on the left and right sides of the inner wall of the guide block 28 along its height direction, and a slide groove 31 is respectively opened on the left and right sides of the slide block 29 along its height direction. Figure 8 As shown, it is used to separately display the support platform 33 located directly below the crankshaft 24. The left and right sides of the support platform 33 are fixedly arranged with the inner wall of the frame 1 respectively (not shown in the figure), and an arc-shaped notch is opened at the front end above it, and the inner wall of the notch is sequentially embedded with wheels 32 along the arc length. The purpose of setting the support platform 33 is to share part of the bearing force of the crankshaft 24 when it rotates, reduce the wear rate of the crankshaft 24, and further reduce the jitter deviation generated when the crankshaft 24 rotates.

[0026] When the personnel starts the stamping work, the rotational motion of the crankshaft 24 is transformed into the movement of the toggle connecting rod rocker arm, which drives the slider 3 to move up and down reciprocatingly. Before it moves up and down reciprocatingly, the personnel can control the start of the pusher 1 and the pusher 2 through the control system. The pusher 1 is started to push the front side of the top plate 10 to fit with the outer surface of the protrusion 5, and the side plates 9 on the left and right sides of the top plate 10 are gradually fitted with the side surfaces of the protrusion 5 through the meshing transmission of the rack 8 and the gear 6, thereby limiting the position of the protrusion 5 moving up and down, and the front side of the fitting ring 23 will indirectly fit with the outer wall of the upper toggle connecting rod 26. It should be noted that if Figures 5 to 7 As shown, when the upper elbow link 26 and the lower elbow link 13 are linked through the elbow pin 12, the transfer ring 17 will be indirectly driven to move back and forth on the guide platform 19 along the length direction of the guide groove 18, and the buffer spring 27 and the sliding block 29 under the guide platform 19 can move downward when subjected to a certain pressure, thereby reducing the inertia of the elbow pin 12 subjected to the pulling force of the slider 3, sharing the force it bears, and reducing the wear rate of the elbow pin 12.

[0027] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A high-precision straight-column toggle-connecting rocker punch press, comprising a frame and a slider connected thereto via a driving mechanism, wherein the driving mechanism comprises a driving motor, a crankshaft, a crankshaft connecting rod, an upper toggle connecting rod, a lower toggle connecting rod, and a toggle pin. The driving motor is arranged outside the frame, one end of which is connected to the crankshaft, the crankshaft is connected to the toggle pin via the crankshaft connecting rod, one end of the upper toggle connecting rod is rotatably connected to the frame, and the other end of the upper toggle connecting rod is rotatably connected to the lower toggle connecting rod via the toggle pin. It is characterized in that A receiving shell is embedded in the frame at one side of the upper toggle connecting rod, and a buffer assembly is arranged in the receiving shell and connected to one end of the toggle pin; The buffer assembly includes a fitting ring sleeved on the outer wall of the toggle pin, a transfer ring and a pressure cover located in the accommodating shell, and a push rod is arranged on the pressure cover, and the push rod passes through the transfer ring and is connected to the fitting ring; The side end of the slider is provided with a protrusion, and the outside of the protrusion is provided with a positioning mechanism; The positioning mechanism includes a positive limit assembly and a side limit assembly, and the positive limit assembly includes a top plate that can be attached to the surface of the protrusion and a driving member; The side limit assembly includes a side plate arranged on the side of the protrusion, a rack connected thereto, and a second driving member arranged outside the frame, wherein the second driving member is provided with a gear meshing with the rack; A guide groove is provided in the accommodating shell, an extension rod is rotatably provided on the toggle pin close to one end of the accommodating shell, one end of the extension rod passes through the guide groove and is located in the accommodating shell, the transfer ring is sleeved on the outer wall of the extension rod, a screw rod is passed through the gland, and a threaded hole threadedly connected to the screw rod is provided on the extension rod; A roller is arranged in the guide groove, a shock absorbing assembly is arranged in the accommodating shell, and the shock absorbing assembly comprises a guide platform arranged under the transfer ring and a buffer spring connecting the guide platform with the accommodating shell.

2. The high-precision straight column type toggle connecting rod rocker punch press according to claim 1, characterized in that: A sliding block is arranged on one side of the guide platform away from the transfer ring, a guide block is arranged in the accommodating shell, and the sliding block is connected to the guide block in an up-and-down sliding manner.

3. The high-precision straight column type toggle connecting rod rocker punch press according to claim 2, characterized in that: A plurality of groups of balls are arranged in equal intervals along the height of the guide block, and sliding grooves are arranged on both sides of the slide block.

4. The high-precision straight column type toggle connecting rod rocker punch press according to claim 1, characterized in that: The accommodating shell and the shock absorbing assembly therein and the buffer assembly are each provided with two groups, which are arranged oppositely at two sides of the wrist pin.

5. The high-precision straight column type toggle connecting rod rocker punch press according to claim 1, characterized in that: The protrusions are provided in two groups, which are arranged on both sides of the slider relatively. The positioning mechanisms are provided in two groups, which are arranged on both sides of the slider relatively, and are respectively matched with the two groups of protrusions in a limited position.

6. The high-precision straight column type toggle connecting rod rocker punch press according to claim 1, characterized in that: A support platform is arranged below the crankshaft in the frame, and a rotating wheel is arranged on the support platform.

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