Connecting rod expansion breaking equipment

Abstract

The utility model relates to connecting rod expansion breaking equipment which comprises a base, a pressing mechanism, a moving mechanism, a movable and fixed sleeve and a pull rod, before the connecting rod expansion breaking process, the large end of a connecting rod is arranged on the periphery of the movable and fixed sleeve in a sleeved mode, the pressing mechanism abuts against bolt supporting faces on the two sides of the large end of the connecting rod, and at least part of the pull rod penetrates into the movable and fixed sleeve. The pull rod is provided with a first abutting face facing the moving mechanism, the movable and fixed sleeve is provided with a second abutting face, and when the connecting rod is fractured, force applied by the first abutting face to the second abutting face can drive part of the fractured connecting rod to drive the moving mechanism to move relative to the base. The moving direction is the same as the force applying direction of the first abutting face to the second abutting face and the force applying direction of the pressing mechanism to the connecting rod, the situation that most of the force borne by the expansion breaking end of the connecting rod and the force applied by the pressing mechanism to the connecting rod are mutually counteracted is avoided, and therefore the effective expansion breaking force is improved; and therefore, chippings generated due to the unsmooth expansion breaking process are reduced, and the product quality of expansion breaking of the connecting rod is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of connecting rod fracture technology, and in particular to a connecting rod fracture device. Background Technology

[0002] With the rapid development of the automotive industry and the increasing demands on engine performance, fracture expansion machining technology has become a widely applied and promoted technique in connecting rod manufacturing. Its principle is based on fracture mechanics and stress concentration theory. After rough machining of the connecting rod, bolt holes are machined first, and two symmetrical pre-fabricated crack grooves (also called stress grooves) are artificially machined inside the large end hole, forming a macroscopic crack notch. Then, utilizing the material's significant sensitivity to the notch, a high stress concentration is formed at the root of the pre-fabricated crack groove. Next, a wedge-shaped iron pushes the expansion sleeve downwards, generating pressure along the axial direction of the line connecting the centers of the large and small end holes of the connecting rod. This causes the pre-fabricated crack groove to initiate and rapidly expand, achieving separation of the connecting rod body from the connecting rod cap with almost no plastic deformation. This process has advantages such as fewer machining steps, resource saving, and high product quality, making it particularly suitable for manufacturing high-performance engine connecting rods. As the core equipment of this technology, the fracture expansion machine is experiencing increasing market demand. To meet market demands, fracture expansion machine manufacturers are continuously innovating and upgrading their equipment, improving machining accuracy, production efficiency, and intelligence and automation.

[0003] However, existing fracture breakage devices typically require the connecting rod to be fixed by a clamping mechanism during operation, and the part is then fractured at a predetermined position by instantaneous force application. During the fracture process, the direction of movement of the fracture end is opposite to the direction of force application by the clamping mechanism. This unreasonable mechanical structure design has two problems: first, the device and clamping mechanism cannot withstand the huge reverse force at the moment of fracture; second, the force applied by the fracture end to the connecting rod and the force applied by the clamping mechanism to the connecting rod largely cancel each other out, thus reducing the effective force used for fracture. This not only directly affects the fracture effect, making it impossible for the fractured part to achieve the ideal fracture surface quality, but also easily generates debris. This debris not only causes wear on the operating parts of the device itself, shortening the service life of the device, but also seriously affects product quality and leads to an increased defect rate when mixed in with the product. This is mainly reflected in the following aspects: 1. Excessive shedding of slag on the fracture surface does not meet industry standards; 2. Peeling and burrs generated after fracture; 3. Height difference of the fracture surface exceeds customer requirements; 4. Excessive deformation after reassembly of the fractured surface, resulting in steps after reassembly. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a connecting rod fracture device, which solves the problem that the existing connecting rod fracture device has a poor fracture effect on the connecting rod.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A connecting rod fracture device includes a base, a clamping mechanism, a moving mechanism, a movable and fixed sleeve, and a pull rod. The clamping mechanism is movable relative to the base to abut against the bolt support surfaces on both sides of the large end of the connecting rod. The large end of the connecting rod is sleeved on the outer periphery of the movable and fixed sleeve. The pull rod at least partially penetrates the movable and fixed sleeve. The pull rod has a first abutting surface, which is disposed facing the moving mechanism. The movable and fixed sleeve has a second abutting surface. The first abutting surface is able to abut against the second abutting surface and apply a force parallel to and the same as the force applied by the clamping mechanism to the second abutting surface to fracture the large end of the connecting rod. The moving mechanism is able to drive the fractured portion of the connecting rod to move relative to the base along the direction of the force when the first abutting surface is subjected to force.

[0007] Furthermore, the moving and fixed sleeves include a separable moving sleeve and a fixed sleeve. The fixed sleeve is disposed on the side close to the clamping mechanism and is fixedly connected to the base. The moving sleeve is disposed on the side away from the clamping mechanism and is fixedly connected to the moving mechanism. The second abutment surface is located on the moving sleeve so that when the large end of the connecting rod breaks, the force generated by the first abutment surface on the second abutment surface acts on the moving sleeve.

[0008] Furthermore, an expansion joint groove is provided at the joint between the moving sleeve and the fixed sleeve, and the expansion joint groove has only two openings in the through direction.

[0009] Furthermore, the slotting direction of the expansion groove is perpendicular to the direction of the force applied by the pull rod to the moving sleeve.

[0010] Furthermore, both the first contact surface and the second contact surface are inclined surfaces.

[0011] Furthermore, the moving mechanism includes a sliding plate and a slider, the sliding plate is connected to the slider, the connecting rod is positioned and installed on the sliding plate, the sliding plate is provided with a slide rail, and the slider can move relative to the slide rail in the direction of the force when the first contact surface applies force to the second contact surface, so as to synchronously drive the sliding plate and the connecting rod provided on the sliding plate to move.

[0012] Furthermore, it also includes a drive device and a piston rod for driving the pull rod. The drive device is connected to the piston rod via a T-shaped block connecting shaft, and the piston rod is connected to the pull rod. The end face of the T-shaped block connecting shaft is arc-shaped.

[0013] Furthermore, the top end of the T-shaped block connecting shaft is chamfered.

[0014] Furthermore, the height of the movable and fixed sleeves is greater than the thickness of the connecting rod, wherein the portion protruding from the large end of the connecting rod is chamfered.

[0015] Furthermore, the slide plate is provided with a detachable fixed plate, and the fixed plate is provided with a positioning block at the small end of the positioning link.

[0016] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0017] This utility model relates to a connecting rod fracture device, including a base, a clamping mechanism, a moving mechanism, a movable and fixed sleeve, and a pull rod. Before the connecting rod fracture process, the large end of the connecting rod is sleeved on the outer periphery of the movable and fixed sleeve. The clamping mechanism abuts against the bolt support surfaces on both sides of the large end of the connecting rod. The pull rod at least partially passes through the movable and fixed sleeve and has a first abutting surface facing the moving mechanism. The movable and fixed sleeve has a second abutting surface. The first abutting surface can fit against the second abutting surface. When the connecting rod fractures, the force applied by the first abutting surface to the second abutting surface can drive the partially fractured connecting rod to move the moving mechanism. The base is moved in the same direction as the force applied to the first contact surface and the second contact surface by the first contact surface and the force applied to the connecting rod by the clamping mechanism. This ensures that the part of the connecting rod near the clamping mechanism does not have to bear a force opposite to the force provided by the clamping mechanism during the fracture process. This avoids the situation where the force on the fracture end of the connecting rod and the force applied to the connecting rod by the clamping mechanism largely cancel each other out, thereby increasing the effective force used for fracture. This reduces the debris generated due to the uneven fracture process, making it more likely that the fracture surface quality will be achieved, and effectively improving the product quality of the fractured connecting rod. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the connecting rod expansion and fracture device provided in one embodiment of the present invention.

[0020] Figure 2 This is a cross-sectional schematic diagram of a connecting rod expansion and fracture device provided in one embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Base;

[0023] 2. Clamping mechanism;

[0024] 3. Moving mechanism; 31. Slide plate; 311. Slide rail; 312. Fixed plate; 313. Positioning block; 32. Slider;

[0025] 4. Moving and fixed sleeves; 41. Second abutment surface; 42. Moving sleeve; 43. Fixed sleeve; 44. Expansion groove;

[0026] 5. Pull rod; 51. First contact surface;

[0027] 6. Connecting rod;

[0028] 7. Drive unit;

[0029] 8. Piston rod; 81. T-block connecting shaft. Detailed Implementation

[0030] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] As attached Figure 1 and attached Figure 2As shown, a connecting rod fracture device includes a base 1, a clamping mechanism 2, a moving mechanism 3, a movable and fixed sleeve 4, and a pull rod 5. Before the connecting rod 6 fractures, the large end of the connecting rod 6 is fitted onto the outer periphery of the movable and fixed sleeve 4. The clamping mechanism 2 abuts against the bolt support surfaces on both sides of the large end of the connecting rod 6. The pull rod 5 at least partially penetrates into the movable and fixed sleeve 4. The pull rod 5 has a first abutting surface 51 facing the moving mechanism, and the movable and fixed sleeve 4 has a second abutting surface 41. The first abutting surface 51 and the second abutting surface 41 are two mating surfaces. During the fracture process of the connecting rod 6... The first abutment surface 51 and the second abutment surface 41 are in contact. The pull rod 5 transmits a force parallel to and the same as the direction of force applied by the pull rod 5 to the second abutment surface 41 of the moving and stationary sleeve 4 through the first abutment surface 51. Since the first abutment surface 51 faces the moving mechanism 3, when the connecting rod 6 breaks, the force applied to the second abutment surface 41 can drive the partially broken connecting rod 6 to move the moving mechanism 3 relative to the base 1. The direction of movement is the same as the direction of force applied by the first abutment surface 51 to the second abutment surface 41 and the direction of force applied by the pressing mechanism 3 to the connecting rod 6.

[0034] In some embodiments, the movable and fixed sleeve 4 has a groove along its central axis, and the pull rod 5 is fully or partially embedded in the groove to generate a force on the movable and fixed sleeve 4 in the same direction as the force applied to the connecting rod 6 by the clamping mechanism 2 when the connecting rod 6 breaks. In other embodiments, the movable and fixed sleeve 4 does not have a groove along its central axis, but rather has a groove at a position eccentrically away from the central axis of the movable and fixed sleeve 4. In this case, it is preferable that the grooves are symmetrically formed along the central axis of the movable and fixed sleeve 4, and the number of pull rods 5 corresponds to the number of grooves. Alternatively, in other embodiments, the axis directions of the pull rod 5 and the movable and fixed sleeve 4 are not parallel, and there is a certain tilt angle. The first abutment surface 51 and the second abutment surface 41 cooperate with each other in an inclined manner, etc. The specific arrangement of the movable and fixed sleeve 4 and the connecting rod 6 can be analyzed and set according to the actual use of the product, as long as the force applied by the first abutment surface 51 to the second abutment surface 41 when the connecting rod 6 breaks is in the same direction as the force applied by the clamping mechanism 2 to the connecting rod 6, it is not limited here.

[0035] In traditional connecting rod fracture devices, the direction of the force applied by the clamping mechanism 2 to the fractured end of the connecting rod 6 during fracture is opposite to the direction of movement of the connecting rod 6 after fracture. This leads to uneven stress distribution within the connecting rod 6 during fracture, preventing the material from fracturing as ideally as possible. Consequently, irregular crack propagation and excessive debris may occur. This invention addresses this issue by ensuring that the portion of the connecting rod 6 near the clamping mechanism does not bear a force opposite to that provided by the clamping mechanism 2 during fracture. It aligns the direction of force movement of the connected rod 6 after fracture with the direction of the force applied by the clamping mechanism 2. This avoids the situation where the force on the fractured end of the connecting rod 6 and the force applied by the clamping mechanism 2 largely cancel each other out, thereby increasing the effective force used for fracture. This makes it more likely that the fracture surface will achieve the ideal fracture quality, reduces debris generated due to uneven fracture process, and effectively improves the product quality of the fractured connecting rod 6.

[0036] In some embodiments of this utility model, as shown in the appendix Figure 1 and attached Figure 2 As shown, the movable sleeve 4 includes a separable movable sleeve 42 and a fixed sleeve 43. The fixed sleeve 43 is located on the side near the clamping mechanism 2 and is fixedly connected to the base 1. The movable sleeve 42 is located on the side away from the clamping mechanism 2 and is fixedly connected to the moving mechanism 3. The second abutment surface 41 is located on the movable sleeve 42. When the connecting rod 6 breaks, the first abutment surface 51 of the pull rod 5 interacts with the second abutment surface 41 on the movable sleeve 42. The force applied by the pull rod 5 can directly act on the movable sleeve 42. When the movable sleeve 42 drives the moving mechanism 3 to move, most of the connecting rod 6 moves with the movable sleeve 42 and generates tension. The clamping mechanism 2 fixes the bolt support surfaces on both sides of the large end of the connecting rod 6. The fixed sleeve 43 also has a restraining effect on the large end of the connecting rod 6, fixing the large end of the connecting rod 6 on the other side of the broken point, so that the connecting rod 6 breaks at a predetermined position. Preferably, the moving sleeve 42 is detachably and fixedly connected to the moving mechanism 3, and the fixed sleeve 43 is detachably and fixedly connected to the base 1. It can be replaced according to the connecting rod 6 of different sizes or shapes, thereby improving the versatility of the connecting rod fracture device.

[0037] In some embodiments of this utility model, as shown in the appendix Figure 2As shown, a fracture groove 44 is provided through the joint between the moving sleeve 42 and the fixed sleeve 43. The fracture groove 44 has only two openings in the through direction, and the pull rod 5 is restricted to the straight direction defined by these two openings. This provides a guiding path for the pull rod 5, allowing it to move only along the through direction of the fracture groove 44 and restricting its displacement in other directions. The pull rod 5 is located in the fracture groove 44, and its axis can be parallel or non-parallel to the axis of the fracture groove 44. Furthermore, when the fracture force of the pull rod 5 is applied to the moving sleeve 42, causing the moving sleeve 42 to tend to move along the fracture force, the pull rod 5 will contact the groove wall in the fracture groove 44. The second abutment surface 41 is provided on the inner wall of the fracture groove 44 on one side of the moving sleeve 42, cooperating with the first abutment surface 51 provided on the pull rod 5, so that when the connecting rod 6 fractures, the moving sleeve 42 drives part of the connecting rod 6 on the moving mechanism 3 to move.

[0038] In some embodiments of this utility model, in order to improve the long-term stability of the connecting rod 6 when it breaks, the slotting direction of the breakage groove 44 is perpendicular to the force applied by the tie rod 5 to the moving sleeve 42, which effectively prevents local stress concentration and thus avoids the risk of wear or deformation of various components.

[0039] In some embodiments of this utility model, as shown in the appendix Figure 2 As shown, both the first and second abutment surfaces are inclined planes. Preferably, the portion of the pull rod 5 extending into the movable and fixed sleeve 4 has a wedge-shaped structure. This is because the diameter of the connecting rod 6 is within tolerance. When the outer wall of the movable and fixed sleeve 4 abuts against the inner wall of the large end of the connecting rod 6, the position of the movable and fixed sleeve 4 will constantly change due to these tolerances, becoming an unpredictable variable. The uncertainty of the position of the movable and fixed sleeve 4 will further affect the fracture location and the applied force when the pull rod 5 breaks the connecting rod 6. When the first abutment surface 51 and the second abutment surface 41 are inclined planes, the relative sliding and adjustment between the inclined planes can automatically adapt to this change, improving the quality and consistency of the fracture of the connecting rod 6.

[0040] In some embodiments of this utility model, as shown in the appendix Figure 1 and attached Figure 2 As shown, the moving mechanism 3 includes a slide plate 31 and a slider 32. The slide plate 31 is connected to the slider 32. The connecting rod 6 is partially positioned on the slide plate 31. The slide plate 31 is provided with a slide rail 311. The direction of the slide rail 311 is consistent with the direction of the breaking force. The slider 32 can convert the force applied by the first abutment surface 51 to the second abutment surface 41 into its own movement on the slide rail 311, and transmit the breaking force received from the moving and fixed sleeve 4 to the moving mechanism, so as to synchronously drive the slide plate 31 and part of the connecting rod 6 provided on the slide plate 31 to move.

[0041] In some embodiments of this utility model, as shown in the appendix Figure 1 and attached Figure 2As shown, the connecting rod fracture device also includes a drive device 7 and a piston rod 8 for driving the connecting rod 5. The drive device 7 is connected to the piston rod 8 via a T-shaped block connecting shaft 81, and the piston rod 8 is connected to the connecting rod 5. When it is necessary to fracture the connecting rod, the drive device 7 provides power to the connecting rod 5 to pull it down. Furthermore, the end face of the T-shaped block connecting shaft 81 is arc-shaped to prevent instability between the first abutment surface 51 and the second abutment surface 41 due to stress problems, such as stress concentration between the first abutment surface 51 and the second abutment surface 41.

[0042] In some embodiments of this utility model, in order to further distribute the stress provided by the drive device 7 evenly, the top end of the T-block connecting shaft 81 is chamfered, which helps to improve the strength and durability of the T-block connecting shaft 81, especially under impact loads or frequent vibrations.

[0043] In some embodiments of this utility model, as shown in the appendix Figure 1 and attached Figure 2 As shown, the height of the movable and fixed sleeve 4 is greater than the thickness of the connecting rod 6. The portion protruding from the large end of the connecting rod 6 has a chamfer to disperse the fracture force applied to the large end of the connecting rod 6. This helps to prevent unnecessary cracks or tears from forming at the large end of the connecting rod 6 during fracture, thus improving the fracture quality. Furthermore, it protects the surface of the inner wall of the connecting rod 6 when it is assembled onto the movable and fixed sleeve 4, preventing wear or scratches.

[0044] In some embodiments of this utility model, as shown in the appendix Figure 1 As shown, a detachable fixed plate 312 is provided on the slide plate 31, and a positioning block 313 for the small end of the positioning connecting rod 6 is provided on the fixed plate 312. During the production process, when it is necessary to change to produce connecting rods 6 of different sizes, it is only necessary to simply disassemble and replace the fixed plate 312 with the corresponding size positioning block 313 and the moving and fixed sleeves 4. There is no need to make large-scale adjustments or modifications to the entire connecting rod breaking equipment, so that the connecting rod breaking equipment can adapt to the processing needs of connecting rods 6 of various sizes, effectively improving its versatility.

[0045] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A connecting rod expansion and fracture device, characterized in that, The device includes a base, a clamping mechanism, a moving mechanism, a movable and fixed sleeve, and a pull rod. The clamping mechanism is movable relative to the base to abut against the bolt support surfaces on both sides of the large end of the connecting rod. The large end of the connecting rod is sleeved on the outer periphery of the movable and fixed sleeve. The pull rod at least partially penetrates the movable and fixed sleeve. The pull rod has a first abutting surface, which is disposed towards the moving mechanism. The movable and fixed sleeve has a second abutting surface. The first abutting surface can abut against the second abutting surface and apply a force parallel to and the same as the force applied by the clamping mechanism to the second abutting surface to break off the large end of the connecting rod. The moving mechanism is able to drive the broken portion of the connecting rod to move relative to the base along the direction of the force when the first abutting surface is subjected to force.

2. The connecting rod fracture device as described in claim 1, characterized in that, The movable and fixed sleeves include a separable movable sleeve and a fixed sleeve. The fixed sleeve is disposed on the side close to the pressing mechanism and is fixedly connected to the base. The movable sleeve is disposed on the side away from the pressing mechanism and is fixedly connected to the moving mechanism. The second abutment surface is located on the movable sleeve so that when the large end of the connecting rod breaks, the force generated by the first abutment surface on the second abutment surface acts on the movable sleeve.

3. The connecting rod fracture device as described in claim 2, characterized in that, The joint between the moving sleeve and the fixed sleeve is provided with an expansion groove, which has only two openings in the through direction.

4. The connecting rod fracture device as described in claim 3, characterized in that, The groove direction of the expansion joint is perpendicular to the direction of the force applied by the pull rod to the moving sleeve.

5. The connecting rod fracture device as described in claim 1, characterized in that, Both the first contact surface and the second contact surface are inclined surfaces.

6. The connecting rod fracture device as described in claim 1, characterized in that, The moving mechanism includes a sliding plate and a slider. The sliding plate is connected to the slider, and a connecting rod is positioned and installed on the sliding plate. The sliding plate is provided with a slide rail. When the first contact surface applies force to the second contact surface, the slider can move relative to the slide rail in the direction of the force so as to synchronously drive the sliding plate and a part of the connecting rod provided on the sliding plate to move.

7. The connecting rod fracture device as described in claim 1, characterized in that, It also includes a drive device and a piston rod for driving the pull rod. The drive device is connected to the piston rod via a T-shaped block connecting shaft. The piston rod is connected to the pull rod. The end face of the T-shaped block connecting shaft is arc-shaped.

8. The connecting rod fracture device as described in claim 7, characterized in that, The top end of the T-shaped block connecting shaft is chamfered.

9. The connecting rod fracture device as described in claim 1, characterized in that, The height of the movable and fixed sleeves is greater than the thickness of the connecting rod, wherein the portion protruding from the large end of the connecting rod is chamfered.

10. The connecting rod fracture device as described in claim 6, characterized in that, The slide plate is provided with a detachable fixed plate, and the fixed plate is provided with a positioning block at the small end of the positioning link.

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