Ball stud connection structure for a press

Abstract

The utility model discloses a ball head pin shaft connecting structure for press, including connecting rod, lower ball bowl and ball bowl cover, the bottom of connecting rod is provided with ball head, its characterized in that: the bottom of ball head is in contact with lower ball bowl, and the top of ball head is not in contact with ball bowl cover, ball head is provided with a through -hole along X direction, and the axis of this through -hole passes through the ball center of ball head, and the through -hole passes through a pin shaft, ball bowl cover is provided with support piece in, and the support piece is used for supporting the both ends of pin shaft, the utility model provides technical scheme has combined the advantage of ball head type and pin shaft type connecting rod structure, and the bottom of ball head and lower ball bowl are in contact and can evenly disperse pressure when stamping, and the pin bears the load in vertical direction when returning, reduces the ball head wear and tear, improves ball head life.

Description

Technical Field

[0001] This utility model relates to the field of press technology, and in particular to a ball head pin connection structure for a press. Background Technology

[0002] Presses are common metal forming and processing equipment, and the connection structure between their connecting rods and slides directly affects the equipment's load-bearing capacity, operational stability, and service life. Currently, the connecting rod connection structures widely used in presses mainly include ball-end type and pin type.

[0003] Ball joint connecting rods transmit loads through the spherical contact between the ball head and the lower ball cup. While they can accommodate certain swing requirements, they require extremely high precision in spherical machining when bearing heavy stamping loads. Furthermore, the assembly clearance between the upper and lower ball cups is difficult to control precisely, resulting in the pressure lubrication system being unable to effectively cover the spherical contact area. This can easily lead to localized wear and jamming, affecting the operational accuracy of the equipment.

[0004] Pin-type connections rely on pins to directly transmit loads. Although the structure is simple, as the tonnage of the press increases, the diameter of the pins needs to be increased significantly to meet the strength requirements. This not only increases the difficulty of processing and assembly, but also generates large impact loads under dynamic working conditions such as demolding and return strokes, shortening the service life of the pins and related components.

[0005] In view of the above technical problems, this utility model proposes a ball joint pin connection structure for a press, which can balance load-bearing stability and movement flexibility, and improve service life by optimizing force distribution. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a ball joint pin connection structure for a press, which aims to solve the technical problem of low service life of the press connecting rod using a simple ball joint or pin structure.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A ball joint pin connection structure for a press includes a connecting rod, a lower ball cup, and a ball cup cover. The bottom end of the connecting rod is provided with a ball head, the bottom of which abuts against the lower ball cup, and the top of which does not abut against the ball cup cover. The ball head has a through hole along the X direction, the axis of which passes through the center of the ball head, and a pin passes through the through hole. A support member is provided inside the ball cup cover to support both ends of the pin.

[0008] Furthermore, in the ball head pin connection structure for the press, the support member is a ring sleeve, and pin holes are respectively provided at both ends of the pin corresponding to the ring sleeve, with each end of the pin inserted into the corresponding pin hole.

[0009] Furthermore, in the ball head pin connection structure for the press, the outer wall of the middle part of the ball head is a cylindrical surface, and the diameter of the cylindrical surface is smaller than the inner diameter of the ring.

[0010] Furthermore, the ball joint pin connection structure for the press also includes an adjusting screw, the top of which is provided with a lower ball cup mounting groove, and the lower ball cup is disposed in the lower ball cup mounting groove.

[0011] Furthermore, in the ball joint pin connection structure for the press, the top end of the adjusting screw and the top end of the lower ball cup are flush, and the top end of the adjusting screw and the top end of the lower ball cup abut against the bottom end of the ring sleeve, respectively.

[0012] Furthermore, in the ball joint pin connection structure for the press, the adjusting screw is provided with a first oil inlet hole along the Z direction, the lower ball cup is provided with a third oil inlet hole along the Z direction, the ball head is provided with a fourth oil inlet hole along the Z direction, and the connecting rod is provided with a fifth oil inlet hole along the Z direction.

[0013] Furthermore, in the ball head pin connection structure for the press, the pin has a first oil inlet branch along the Y direction and a second oil inlet branch along the X direction; the first oil inlet branch and the second oil inlet branch respectively pass through the pin.

[0014] Furthermore, in the ball joint pin connection structure for the press, the first oil inlet hole includes a small diameter hole and a large diameter hole arranged sequentially from top to bottom. An oil inlet screw is provided in the small diameter hole, and the oil inlet screw is screwed into the third oil inlet hole and threadedly connected to the lower ball cup. The oil inlet screw is provided with a second oil inlet hole along the Z direction.

[0015] Furthermore, in the ball joint pin connection structure for the press, the ball joint pin connection structure for the press further includes a threaded sleeve that is threadedly connected to the adjusting screw; the bottom end of the threaded sleeve is connected to a transition plate; an oil inlet pipe is connected to the transition plate, the oil inlet pipe extends into the large diameter hole of the first oil inlet, and an oil baffle is provided at the bottom of the large diameter hole; an oil inlet port is provided on the transition plate, and the oil inlet port communicates with the oil inlet pipe.

[0016] Beneficial effects: This utility model provides a ball joint pin connection structure for a press. Compared with the prior art, the most significant innovation is that a pin passes through the middle of the ball joint and a corresponding support is provided. This innovation has at least the following advantages: (1) During stamping, the bottom of the ball head and the inner spherical surface of the lower ball bowl are in contact, and the load can be evenly distributed to the entire inner wall of the lower ball bowl, avoiding local stress concentration.

[0017] (2) When the stamping return stroke is completed, the main pin bearing is subjected to a load in the vertical direction, which avoids the decrease in accuracy caused by the wear of the spherical surface in the traditional ball head structure.

[0018] (3) Since the pin is under force during the return stroke, there is no need to set an upper ball cup that matches the top of the ball head. Only a ball cup cover is needed. The top of the ball head and the ball cup cover do not abut against each other. This not only makes assembly simple, but also avoids the problem of the upper ball cup deforming after a period of use, which leads to a decrease in the fit accuracy with the top of the ball head, as is the case in traditional technology. Attached Figure Description

[0019] Figure 1 Cross-sectional view of the ball joint pin connection structure for a press provided by this utility model. Figure 1 .

[0020] Figure 2 Cross-sectional view of the ball joint pin connection structure for a press provided by this utility model. Figure 2 .

[0021] Figure 3 for Figure 1 A magnified view of part A in the middle.

[0022] Figure 4 for Figure 2 A magnified view of part B in the middle section.

[0023] Figure 5 for Figure 2 A magnified view of part C in the middle.

[0024] Figure 6 This is a sectional view of the pin.

[0025] Figure 7 This is a three-dimensional diagram of the connecting rod, ball head, pin, ring, and lower ball cup.

[0026] Figure 8 This is a 3D view of the connecting rod, ball joint, and pin.

[0027] Explanation of reference numerals in the attached figures: 1. Connecting rod; 11. Connecting rod big end; 10. Fifth oil inlet; 2. Ball head; 20. Fourth oil inlet hole; 21. Top of ball head; 22. Cylindrical surface of ball head; 23. Bottom of ball head; 3. Pin; 41. Lower ball cup; 410. Third oil inlet; 42. Ball cup cover; 421. Top plate; 4210. Center hole on the top plate; 422. Annular sidewall; 43. Ring sleeve; 51. Adjusting screw; 510. First oil inlet hole; 511. Cylindrical pin; 512. Lower ball cup mounting groove; 519. Bolt; 52. Threaded sleeve; 53. Oil inlet pipe; 531. Oil baffle; 54. Oil inlet screw; 540. Second oil inlet hole; 61. Transition plate; 610. Oil inlet; 62. Stamping slide block; 71. Worm gearbox; 72. Worm; 73. Worm gear; 730. Worm gear keyway; 81. First guide sleeve; 82. Second guide sleeve; 91. Crankshaft; 92. Bearing. Detailed Implementation

[0028] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model is further described in detail below. It should be understood that the specific embodiments described herein are merely for explaining this utility model and are not intended to limit this utility model.

[0029] Please see Figures 1 to 8 This utility model provides a ball joint pin connection structure for a press. The accompanying drawings are for illustrative purposes only and are not to scale with actual products. The drawings only depict structures relevant to the innovation of this application; some conventional structures are not specifically shown. Figure 1 The cutting plane is parallel to the crankshaft. Figure 2 The cutting surface is perpendicular to the crankshaft. Figure 6 The cutting surface is horizontal and passes through the axis of the crankshaft. Figure 1 The crankshaft is schematically represented by the center line.

[0030] The terms "first," "second," etc., used in this document are merely different names for similar structures to facilitate explanation and are not intended to limit this utility model. For ease of explanation, a coordinate system is established in this document: the X-direction is parallel to the crankshaft, the Y-direction is horizontally perpendicular to the X-direction, and the Z-direction is vertical. The establishment of this coordinate system is not intended to limit this utility model, as changing the coordinate system does not alter the essence of the technical solution.

[0031] The ball joint pin connection structure for a press includes a connecting rod 1, a lower ball cup 41, and a ball cup cover 42. A ball head 2 is located at the bottom end of the connecting rod. The bottom 23 of the ball head abuts against the lower ball cup 41, while the top 21 of the ball head does not abut against the ball cup cover 41. The ball head 2 has a through hole along the X-direction (this through hole is adapted to the pin), the axis of which passes through the center of the ball head 2, and a pin 3 passes through it. A support member is provided inside the ball cup cover to support both ends of the pin. Preferably, the ball head and connecting rod are integrally formed. The spherical radius of the bottom of the ball head is adapted to the inner spherical radius of the lower ball cup, with a clearance controlled at 0.02~0.05mm to ensure stable spherical contact and prevent jamming.

[0032] Furthermore, the support member is a ring sleeve 43, and pin holes are respectively provided at both ends of the pin corresponding to the pin 3. The two ends of the pin are respectively inserted into the corresponding pin holes. The inner diameter of the pin hole on the ring sleeve is 0.01~0.03mm larger than the outer diameter of the pin, forming a clearance fit.

[0033] Furthermore, the outer wall of the middle part of the ball head 2 is a cylindrical surface 22, the diameter of which is smaller than the inner diameter of the ring 43. Because the diameter of the cylindrical surface is smaller than the diameter of the ball head, the overall structure of the ball head, ring, and ball cup cover is more compact. The height of the cylindrical surface is preferably one-third of the diameter of the ball head. The diameter of the cylindrical surface in the middle of the ball head is 1-2 mm smaller than the inner diameter of the ring, forming an annular gap. This gap provides sufficient space for the ball head to swing within the ring, preventing interference between the ball head and the ring; it also serves as a temporary storage space for lubricating oil, improving the lubrication effect. Preferably, the surface roughness of the cylindrical surface of the ball head is Ra0.8 μm to reduce frictional resistance with the lubricating oil.

[0034] Please see Figure 3 and Figure 4 Furthermore, the ball joint pin connection structure for the press also includes an adjusting screw 51, the top of which is provided with a lower ball cup mounting groove 512, and the lower ball cup 41 is disposed in the lower ball cup mounting groove 512. The inner diameter of the lower ball cup mounting groove and the outer diameter of the lower ball cup are in transition fit (i.e., between clearance fit and interference fit).

[0035] Please continue reading. Figure 3 and Figure 4 The ball-and-socket cover 42 includes a top plate 421 and an annular sidewall 422. The inner diameter of the annular sidewall 422 is slightly larger than the outer diameter of the ring sleeve 43, resulting in a clearance fit between the annular sidewall and the ring sleeve. The annular sidewall 422 is fixedly connected to the adjusting screw 51 by bolts 519, ensuring the reliable installation of the ball-and-socket cover. The top plate has a central hole with a diameter larger than that of the ball head, allowing the ball head to pass directly downward through the central hole of the top plate, thus facilitating assembly.

[0036] Furthermore, the top of the adjusting screw 51 is flush with the top of the lower ball cup 41, and the top of the adjusting screw and the top of the lower ball cup abut against the bottom of the ring 43. The flatness error between the top of the adjusting screw and the top of the lower ball cup is controlled within 0.01 mm / m to ensure that the contact between the two and the bottom of the ring is a surface contact, avoiding uneven local force distribution.

[0037] Furthermore, the adjusting screw 51 is provided with a first oil inlet 510 along the Z direction (e.g., Figure 1As shown, the lower ball cup has a third oil inlet 410 along the Z direction, the ball head 2 has a fourth oil inlet 20 along the Z direction, and the connecting rod 1 has a fifth oil inlet 10 along the Z direction. The first, third, fourth, and fifth oil inlets are coaxially arranged. Preferably, the coaxiality error of each oil inlet does not exceed 0.05mm to ensure smooth flow of lubricating oil.

[0038] Please see Figure 3 , Figure 6 and Figure 8 Furthermore, the pin 3 is provided with a first oil inlet branch 301 along the Y direction and a second oil inlet branch 302 along the X direction; the first oil inlet branch and the second oil inlet branch respectively pass through the pin. That is, the first oil inlet branch passes through the pin radially, and the second oil inlet branch passes through the pin axially.

[0039] The connection between the first oil inlet branch 301 and the second oil inlet branch 302 is rounded (rounded corner radius R1) to prevent eddies from forming during lubricant flow. Since both ends of the first oil inlet branch penetrate the side wall of the pin, and both ends of the second oil inlet branch extend to the end faces of the pin, it ensures that the lubricant can be directly delivered to the contact area between the pin and the ring sleeve.

[0040] Please see Figures 1 to 5 Furthermore, the first oil inlet hole 510 includes a small-diameter hole and a large-diameter hole arranged sequentially from top to bottom. An oil inlet screw 54 is provided in the small-diameter hole, which is screwed into the third oil inlet hole 410 and threadedly connected to the lower ball cup 41. The oil inlet screw 54 has a second oil inlet hole 540 along the Z direction. By providing the oil inlet screw, the lower ball cup is fixedly connected to the adjusting screw, preventing displacement of the lower ball cup. At the same time, since the oil inlet screw has a second oil inlet hole (the second oil inlet hole penetrates the entire oil inlet screw), the lubricating oil can be delivered normally.

[0041] Furthermore, the ball joint pin connection structure for the press also includes a threaded sleeve 52 threadedly connected to the adjusting screw 51; the bottom end of the threaded sleeve is connected (preferably bolted) to a transition plate 61; an oil inlet pipe 53 is connected to the transition plate, the oil inlet pipe 53 extending into the large-diameter hole of the first oil inlet 510, and an oil baffle 531 is provided at the bottom of the large-diameter hole (e.g., Figure 5 (As shown); the transition plate is provided with an oil inlet 610, which is connected to the oil inlet pipe.

[0042] For ease of understanding, the flow direction of lubricating oil in the oil circuit is briefly described below. Lubricating oil enters the oil inlet pipe 53 through the oil inlet 610. The lubricating oil passes through the first oil inlet 510, then through the second oil inlet 540 of the oil screw 54, reaching the third oil inlet 410 of the lower ball joint 41, thus lubricating the ball joint and the lower ball joint. Further, it reaches the fourth oil inlet 20 of the ball joint 2, lubricating the contact area between the pin and the ball joint. The lubricating oil further reaches the fifth oil inlet 10, rising upwards to the connecting rod big end 11 (the top of the connecting rod in the figure), thereby lubricating the bearing 92 (such as...) located at the connecting rod big end. Figure 2 As shown), the connecting rod big end is connected to the crankshaft via a bearing bush, and the lubrication of the bearing bush ensures smooth rotation of the connecting rod and crankshaft. Part of the lubricating oil inside the ball joint enters the pin shaft through the first oil inlet branch 301, and further reaches both ends of the pin shaft through the second oil inlet branch 302, thus lubricating the contact points between the pin shaft and the ring sleeve. In addition, the pin shaft is also provided with two third oil inlet branches 303 (such as...). Figure 3 and Figure 8 As shown), the bottom end of each third oil inlet branch is connected to the second oil inlet branch, and the top end of each third oil inlet branch extends to the side wall of the pin and the corresponding position of the ring sleeve, thereby lubricating the contact area between the pin and the ring sleeve.

[0043] In practical applications, the transition plate is bolted to the bottom of the stamping slide. Multiple guide pillars (not shown in the figure) are usually installed between the stamping slide and the press to ensure the reciprocating movement of the stamping slide. For ease of understanding, the principle of mold adjustment is further briefly described below. The press body is equipped with a worm gear box 71, which contains a worm gear 73 and a worm 72. A cylindrical pin 511 is mounted on the adjusting screw 51, with one end of the pin engaged in the keyway 730 of the worm gear 73 (e.g., ...). Figure 3 (As shown). The mold-adjusting motor of the press (not shown in the figure) drives the worm 72 to rotate, the worm 72 drives the worm wheel 73 to rotate, and the worm wheel 73 drives the adjusting screw 51 to rotate through the cylindrical pin 511, thereby realizing the rotation of the threaded pair composed of the adjusting screw 51 and the threaded sleeve 52. During mold adjustment, the adjusting screw 51 rotates but does not move up and down. Therefore, the threaded sleeve 52 moves up and down (the threaded sleeve 52 is connected to the stamping slide 62 through the transition plate 61, so it does not rotate), thereby adjusting the height position of the stamping slide and realizing mold adjustment. One end of the cylindrical pin 511 is stuck in the keyway of the worm wheel and is only used to transmit rotational torque (transmitting the rotational motion of the worm wheel to the adjusting screw). During normal stamping, the vertical movement of the adjusting screw will not interfere with the worm wheel.

[0044] Depend on Figure 1 and Figure 3It can also be observed that a first guide sleeve 81 is provided between the annular sidewall 422 of the ball cup cover 42 and the machine body, so that the ball cup cover can reciprocate stably in the vertical direction and rotate around the vertical axis. A second guide sleeve 82 is provided between the threaded sleeve 52 and the lower part of the worm gear box 71, which can realize the sliding of the threaded sleeve up and down.

[0045] As can be seen from the above analysis, the main difference between this application and the prior art lies in the fact that a pin passes through the middle of the ball head, and a corresponding support component is provided. To better understand the technical effects brought about by the innovation of this application, a simple force analysis is conducted below.

[0046] When the press performs stamping, a huge load is generated in the vertical direction. The spherical surface of the ball head bottom 23 is in close contact with the inner spherical surface of the lower ball cup 41, forming a large load-bearing area. Due to the characteristics of spherical contact, the load can be evenly distributed to the entire inner wall of the lower ball cup, avoiding local stress concentration. At this time, the ball head top 21 is not in contact with the ball cup cover 42, and the pin 3 is only in a "follow-up state" and does not bear the main stamping load.

[0047] During the return stroke after stamping, the load in the vertical direction is significantly reduced. At this time, the connecting rod drives the ball head 2 to swing, and the pin 3 bears the load in the vertical direction. The pin 3 transmits the load to the ring sleeve 43. The resulting technical benefits include: (1) Since the load is small in this stage, the pin does not need to be too large in diameter to meet the strength requirements, avoiding the processing and assembly difficulties caused by the large diameter of the traditional pin structure. (2) Since the vertical load is borne by the pin bearing in this stage, it is not necessary to set an upper ball cup that matches the top of the ball head (in this application, a ball cup cover is set, and the top of the ball head does not need to abut against the ball cup cover), and only the lower ball cup 41 is retained. Since the split upper ball cup of the traditional ball head structure is eliminated, the number of ball surface machining is reduced. The ball head and ball cup cover in this application are simple to assemble and do not need to be precisely matched as the ball head top and upper ball cup in the traditional technology. (3) Due to the clearance fit between the pin and the pin hole on the ring sleeve, when the connecting rod drives the ball head to rotate in this stage, the pin and the pin hole of the ring sleeve will rub against each other. The bottom of the ball head and the inner spherical surface of the lower ball cup will not be subjected to force, thereby reducing wear and avoiding the decrease in accuracy caused by spherical wear in the traditional ball head structure.

[0048] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. It is understood that those skilled in the art can make equivalent substitutions or modifications based on the technical solution and inventive concept of the present utility model, and all such modifications or substitutions should fall within the protection scope of the present utility model.

Claims

1. A ball joint pin connection structure for a press, comprising a connecting rod, a lower ball cup, and a ball cup cover, wherein a ball joint is provided at the bottom end of the connecting rod, characterized in that: The bottom of the ball head abuts against the lower ball cup, while the top of the ball head does not abut against the ball cup cover. A through hole is provided in the ball head along the X direction, the axis of which passes through the center of the ball head, and a pin passes through the through hole. A support is provided inside the ball cup cover to support both ends of the pin.

2. The ball joint pin connection structure for a press according to claim 1, characterized in that: The support is a ring sleeve, and pin holes are provided at both ends of the pin corresponding to the ring sleeve. The two ends of the pin are inserted into the corresponding pin holes.

3. The ball-head pin connection structure for a press according to claim 2, characterized in that: The outer wall of the middle part of the ball head is a cylindrical surface, and the diameter of the cylindrical surface is smaller than the inner diameter of the ring.

4. The ball-head pin connection structure for a press according to claim 2, characterized in that: The ball joint pin connection structure for the press also includes an adjusting screw, the top of which is provided with a lower ball cup mounting groove, and the lower ball cup is disposed in the lower ball cup mounting groove.

5. The ball-head pin connection structure for a press according to claim 2, characterized in that: The top of the adjusting screw is flush with the top of the lower ball cup, and the top of the adjusting screw and the top of the lower ball cup abut against the bottom of the ring sleeve.

6. The ball-head pin connection structure for a press according to claim 4, characterized in that: The adjusting screw has a first oil inlet hole along the Z direction, the lower ball cup has a third oil inlet hole along the Z direction, the ball head has a fourth oil inlet hole along the Z direction, and the connecting rod has a fifth oil inlet hole along the Z direction.

7. The ball joint pin connection structure for a press according to claim 6, characterized in that: The pin has a first oil inlet branch along the Y direction and a second oil inlet branch along the X direction; the first oil inlet branch and the second oil inlet branch pass through the pin respectively.

8. The ball-head pin connection structure for a press according to claim 6, characterized in that: The first oil inlet hole includes a small diameter hole and a large diameter hole arranged sequentially from top to bottom. An oil inlet screw is provided in the small diameter hole. The oil inlet screw is screwed into the third oil inlet hole and threadedly connected to the lower ball cup. The oil inlet screw is provided with a second oil inlet hole along the Z direction.

9. The ball-head pin connection structure for a press according to claim 8, characterized in that: The ball head pin connection structure for the press also includes a threaded sleeve that is threadedly connected to the adjusting screw; the bottom end of the threaded sleeve is connected to a transition plate; an oil inlet pipe is connected to the transition plate, the oil inlet pipe extends into the large diameter hole of the first oil inlet, and an oil baffle is provided at the bottom of the large diameter hole; an oil inlet port is provided on the transition plate, and the oil inlet port is connected to the oil inlet pipe.

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