Connecting rod expansion breaking equipment

Abstract

The connecting rod expansion breaking equipment comprises a base, a pressing mechanism, a movable and fixed sleeve, a pull rod and a moving mechanism, the pressing mechanism comprises a retaining device and a pressing assembly, the pressing assembly is provided with an ejector rod abutting against bolt supporting faces on the two sides of the large end of a connecting rod, and the pressing assembly is further provided with a locking part; the opening direction of the locking part and the force application direction of the pressing assembly form an angle, and the locking part is used for being matched with the retaining device, so that the retaining device has a locking state for limiting the ejector rod to return when the connecting rod is cracked. Original single hydraulic jacking is changed into cooperation of hydraulic jacking and mechanical locking, and it is ensured that the jacking rod can continuously and stably provide pressing force for the connecting rod in the expansion breaking process of the connecting rod. In addition, the situation that most of the force borne by the expansion breaking end of the connecting rod and the force applied to the connecting rod by the pressing mechanism counteract each other is avoided, and the effective expansion breaking force is improved. Therefore, chippings generated due to the fact that the expansion breaking process is not smooth can be reduced, and the expansion breaking accuracy and the product quality of the connecting rod are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of connecting rod splitting, and particularly relates to a connecting rod splitting device. Background Art

[0002] With the rapid development of the automotive industry and the continuous improvement of the requirements for engine performance, the splitting processing technology has been widely applied and popularized as an important technology in connecting rod processing. Its principle is based on fracture mechanics and stress concentration theory. After rough machining of the connecting rod, bolt holes are first machined, and two symmetrical prefabricated crack grooves (also called stress grooves) are artificially machined on the inner side of the big-end hole to form a macroscopic crack notch. Then, by utilizing the significant sensitivity of the material to the notch, a high stress concentration is formed at the root of the prefabricated crack groove. Next, the expansion sleeve is pushed downward by a wedge iron to generate pressure in the axial direction of the center line connecting the big and small end holes of the connecting rod, so that the prefabricated crack groove starts to crack and rapidly expand, thereby achieving the separation of the connecting rod body and the connecting rod cap with almost no plastic deformation. This process has the advantages of fewer processing procedures, resource saving, and high product quality, and is particularly suitable for the manufacture of connecting rods for high-performance engines. As the core equipment of this technology, the market demand for splitting equipment is also increasing continuously. In order to meet the market demand, splitting equipment manufacturers are constantly carrying out technological innovation and equipment upgrading to improve the processing accuracy, production efficiency, intelligence, and automation of the equipment.

[0003] In the operation process of existing splitting equipment, generally, the connecting rod needs to be fixed by a pressing mechanism, and the part is fractured at a predetermined position by applying force instantaneously. During the splitting process, first, when the hydraulic system fails or the pressure is insufficient, the clamping method relying on the hydraulic system will result in insufficient pressing force provided by the pressing mechanism. Second, the moving direction of the splitting end is opposite to the force application direction of the pressing mechanism. Due to the application of the opposite force, the pressing mechanism will further displace, thus affecting the splitting effect of the connecting rod and the product quality. Moreover, the force applied by the splitting end to the connecting rod and the force applied by the pressing mechanism to the connecting rod will cancel each other out to a large extent, thereby reducing the effective force for splitting. This will also directly affect the splitting effect, making the fracture surface quality of the splitting part of the component unable to reach the ideal state, and it is extremely easy to generate debris. These debris will not only cause wear to the running parts of the equipment itself, shortening the service life of the equipment, but also seriously affect the product quality when mixed into the product, resulting in an increase in the defective rate. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a connecting rod splitting device, which solves the problems of insufficient pressing force when using a hydraulic mechanism for pressing and poor splitting effect of the connecting rod.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A connecting rod splitting device, comprising

[0007] a base;

[0008] a pressing mechanism, arranged on the base and capable of moving relative to the base, the pressing mechanism includes a backstop device and a pressing assembly, the pressing assembly has a ejector rod that abuts against the two bolt support surfaces on both sides of the big end of the connecting rod, the pressing assembly is further provided with a locking portion, the opening direction of the locking portion forms an angle with the force application direction of the pressing assembly, and the locking portion is used to cooperate with the backstop device so that the backstop device has a locked state that restricts the ejector rod from retreating when the connecting rod is split, so as to abut against the two bolt support surfaces on both sides of the big end of the connecting rod;

[0009] a movable and fixed sleeve, the big end of the connecting rod is sleeved on the outer periphery of the movable and fixed sleeve;

[0010] a pull rod, at least partially penetrating into the movable and fixed sleeve, capable of applying a force parallel and identical to the force application direction of the pressing mechanism to the movable and fixed sleeve, so as to split the big end of the connecting rod;

[0011] a moving mechanism, used to drive a part of the split connecting rod to move relative to the base along a direction parallel and identical to the force application direction of the pressing mechanism when the pull rod applies force.

[0012] Further, the locking portion is a groove structure, and the backstop device at least penetrates into the locking portion.

[0013] Further, the locking portion is a locking groove penetrating through the pressing assembly, and the locking groove has only two openings in the penetrating direction.

[0014] Further, the backstop device has a first abutting surface, the locking portion has a second abutting surface, and the first abutting surface can be attached to the second abutting surface and apply a force parallel and identical to the force application direction of the ejector rod to the second abutting surface.

[0015] Further, both the first abutting surface and the second abutting surface are inclined surfaces.

[0016] Further, the backstop device has a third abutting surface, the third abutting surface and the first abutting surface are respectively located on both sides of the backstop device in the force application direction of the ejector rod; the pressing assembly further includes a fourth abutting surface, and the fourth abutting surface is located in the penetrating direction of the locking portion;

[0017] The backstop device can penetrate out of the locking portion, and the third abutting surface on the penetrated part is attached to the fourth abutting surface and applies a force parallel and opposite to the force application direction of the ejector rod to the fourth abutting surface.

[0018] Further, the pressing assembly further includes a supporting portion and a movable portion. The movable portion is fixedly connected to the ejector rod and drives the ejector rod to move along the force application direction. The locking portion is located on the movable portion.

[0019] The supporting portion has a first through groove and a second through groove that communicate with each other. The grooving direction of the first through groove is perpendicular to the grooving direction of the second through groove and is the same as the force application direction of the anti-retreat device. The movable portion moves within the first through groove.

[0020] Part of the anti-retreat device moves within the second through groove to cooperate with the locking portion on the movable portion to limit the backward movement of the ejector rod when the connecting rod is fractured by expansion.

[0021] Further, the pressing assembly further includes a first sleeve and a second sleeve fixedly arranged on both sides of the second through groove located on both sides of the first through groove.

[0022] The anti-retreat device includes an anti-retreat rod. The anti-retreat rod is slidably matched with the first sleeve, and the part of the anti-retreat rod passing through the locking portion can be slidably matched with the second sleeve. The third abutting surface and the first abutting surface are respectively located on both sides of the anti-retreat rod in the force application direction of the ejector rod. The fourth abutting surface is arranged on the inner wall of the second sleeve.

[0023] The anti-retreat rod further has a fifth abutting surface, and the inner wall of the first sleeve has a sixth abutting surface. The fifth abutting surface and the sixth abutting surface are circumferentially matched.

[0024] Further, the movable and fixed sleeves include a separable movable sleeve and a fixed sleeve. The fixed sleeve is arranged on the side close to the pressing mechanism and is fixedly connected to the base. The movable sleeve is arranged on the side far from the pressing mechanism and is fixedly connected to the moving mechanism. The movable sleeve is provided with a seventh abutting surface. The pull rod has an eighth abutting surface and the eighth abutting surface is arranged facing the moving mechanism. The eighth abutting surface can be attached to the seventh abutting surface and apply a force parallel and identical to the force application direction of the pressing mechanism to the seventh abutting surface to fracture the large head end of the connecting rod. And the moving mechanism can drive the fractured part of the connecting rod to move relative to the base along the direction of the force when the eighth abutting surface applies force.

[0025] Further, it further includes a driving device for driving the pull rod and a piston rod. The driving device is connected to the piston rod through 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.

[0026] In summary, compared with the prior art, the present invention at least has the following beneficial effects:

[0027] The present invention relates to a connecting rod splitting device, which includes a base, a pressing mechanism, a movable and a fixed sleeve, a pull rod for providing a splitting force, and a moving mechanism for driving a part of the split connecting rod to move relative to the base in a direction parallel and the same as the direction of the force applied by the pressing mechanism when the pull rod applies force. Among them, the pressing mechanism includes a backstop device and a pressing assembly. The pressing assembly has a push rod that abuts against the two bolt support surfaces on both sides of the big end of the connecting rod. The pressing assembly is also provided with a locking portion. The opening direction of the locking portion forms an angle with the force application direction of the pressing assembly, and the locking portion is used to cooperate with the backstop device so that the backstop device has a locked state that restricts the push rod from retracting when the connecting rod is split, so as to abut against the two bolt support surfaces on both sides of the big end of the connecting rod. It has changed from the original single hydraulic pressing to the cooperation of hydraulic pressing and mechanical locking, ensuring that the push rod can continuously and stably provide a pressing force to the connecting rod during the splitting process of the connecting rod, preventing the push rod from loosening or displacing when the connecting rod is split. In addition, the part of the connecting rod close to the pressing mechanism does not need to bear a force opposite to the force provided by the pressing mechanism during the splitting process, avoiding the situation where most of the force received by the split end of the connecting rod and the force applied by the pressing mechanism to the connecting rod cancel each other out. Therefore, since it is possible to avoid the splitting deviation of the connecting rod caused by the displacement of the push rod while ensuring the effective force for splitting, it is possible to reduce the debris generated due to the unsmooth splitting process, making it more likely to achieve an ideal fracture surface quality at the splitting location, effectively improving the accuracy of connecting rod splitting and the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a schematic structural diagram of a connecting rod splitting device provided in an embodiment of the present invention.

[0030] Figure 2 It is a right view schematic diagram of a connecting rod splitting device provided in an embodiment of the present invention.

[0031] Figure 3 For Figure 2 the cross-sectional view at A-A in

[0032] Figure 4 For Figure 3 the enlarged schematic diagram of

[0033] Figure 5 It is a cross-sectional view schematic diagram of a pressing mechanism provided in an embodiment of the present invention.

[0034] Figure 6 ForFigure 2 Schematic cross-sectional view taken along line B-B in

[0035] Description of reference numerals:

[0036] 1. Base

[0037] 2. Pressing mechanism; 21. Anti-return device; 211. Anti-return rod; 212. Driving part; 22. Pressing assembly; 221. Thrust rod; 222. Locking part; 223. Supporting part; 2231. First through groove; 2232. Second through groove; 224. First sleeve; 225. Second sleeve; 226. Moving part

[0038] 3. Moving and fixed sleeves; 31. Moving sleeve; 32. Fixed sleeve

[0039] 4. Tie rod

[0040] 5. Connecting rod

[0041] 6. Moving mechanism; 61. Slide plate; 611. Slide rail; 612. Fixed plate; 613. Positioning block; 62. Slide block

[0042] 71. First abutting surface; 72. Second abutting surface; 73. Third abutting surface; 74. Fourth abutting surface; 75. Fifth abutting surface; 76. Sixth abutting surface; 77. Seventh abutting surface; 78. Eighth abutting surface

[0043] 8. Driving device

[0044] 9. Piston rod; 91. T-shaped block connecting shaft Detailed implementation manners

[0045] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0048] As shown in the Figure 1 - attached Figure 4 accompanying drawings, a connecting rod splitting device includes

[0049] a base 1;

[0050] a pressing mechanism 2, which is arranged on the base 1 and can move relative to the base 1. The pressing mechanism 2 includes a backstop device 21 and a pressing assembly 22. The pressing assembly 22 has a ejector rod 221 that abuts against the two bolt support surfaces on both sides of the large end of the connecting rod 5. The pressing assembly 22 is also provided with a locking portion 222. The opening direction of the locking portion 222 forms an angle with the force application direction of the pressing assembly 22, and the locking portion 222 is used to cooperate with the backstop device 21 so that the backstop device 21 has a locked state that restricts the ejector rod 221 from retracting when the connecting rod 5 is split, so as to abut against the two bolt support surfaces on both sides of the large end of the connecting rod 5;

[0051] a movable and fixed sleeve 3, and the large end of the connecting rod 5 is sleeved on the outer periphery of the movable and fixed sleeve 3;

[0052] a pull rod 4, at least partially penetrating into the movable and fixed sleeve 3, capable of applying a force parallel and identical to the force application direction of the pressing mechanism 2 to the movable and fixed sleeve 3 to split the large end of the connecting rod 5;

[0053] a moving mechanism 6, which is used to drive a part of the split connecting rod 5 to move relative to the base 1 in a direction parallel and identical to the force application direction of the pressing mechanism 2 when the pull rod 4 applies force.

[0054] Specifically, the large end of the connecting rod 5 is sleeved on the outer periphery of the movable and fixed sleeve 3. Then, after the pressing component 22 pushes the ejector rod 221 to the bolt support surfaces on both sides of the large end of the connecting rod 5, the anti-retreat device 21 moves and cooperates with the locking portion 222 to switch the ejector rod 221 to the locked state. During the process of the connecting rod 5 being fractured, it is ensured that the ejector rod 221 continuously and stably provides a pressing force to the connecting rod 5 in a self-locking manner, solving the problem of insufficient pressing force provided by the hydraulic system to the pressing mechanism 2. And during the fracturing process, the pull rod 4 applies a force parallel and in the same direction as the force applied by the pressing mechanism 2 to the movable and fixed sleeve 3 to fracture the large end of the connecting rod 5. The part of the connecting rod 5 away from the pressing mechanism 2 can move relative to the base 1 along a direction parallel and in the same direction as the force applied by the pressing mechanism 2 through the moving mechanism 6, so that the part of the connecting rod 5 close to the pressing mechanism 2 does not need to bear a force opposite to the force provided by the pressing mechanism 2 during the fracturing process, avoiding the situation where most of the force received by the fractured end of the connecting rod 5 and the force applied by the pressing mechanism 2 to the connecting rod 5 cancel each other out, thereby increasing the effective force for fracturing.

[0055] In some embodiments, the main structure of the pressing component 22 is only the ejector rod 221 and the driving device for driving the ejector rod 221, and a locking portion 222 is provided on each ejector rod 221; in some other embodiments, the main structure of the pressing component 22 is to integrate the ejector rods 221 on both sides into a common frame, flat plate or housing, etc., and a total rod capable of pushing the integrated body is used to ensure the synchronous movement of the ejector rods 221 on both sides. The driving device is connected to the total rod to push the ejector rod 221, and the locking portion 222 is provided on the total rod. Further, the anti-retreat device 21 may include a pin, a plunger or other structures capable of cooperating with the locking portion 222.

[0056] In addition, in some embodiments, the movable and fixed sleeve 3 is provided with a groove along the central axis, and the pull rod 4 is completely or partially embedded in the groove for generating a force on the movable and fixed sleeve 3 in the same direction as the force applied by the pressing mechanism 2 to the connecting rod 5 when the connecting rod 5 is fractured; in some other embodiments, the movable and fixed sleeve 3 is not provided with a groove along the central axis, but a groove is provided at a position with an eccentric distance from the central axis of the movable and fixed sleeve 3. In this case, it is preferably that the groove is opened symmetrically about the central axis of the movable and fixed sleeve 3, and the number of pull rods 4 corresponds to the number of grooves opened; or, in some other embodiments, the pull rod 4 is not parallel to the axis direction of the movable and fixed sleeve 3, and there is a certain inclination angle, and the pull rod 4 and the main stress surface of the movable and fixed sleeve 3 cooperate with each other in an inclined manner, etc. The setting manner of the movable and fixed sleeve 3 and the connecting rod 5 can be specifically analyzed and set according to the actual use situation of the product, etc., as long as when the connecting rod 5 is fractured, the fracturing force applied by the pull rod 4 to the movable and fixed sleeve 3 and then the moving direction of the moving mechanism 6 is consistent with the direction of the force applied by the pressing mechanism 2 to the connecting rod 5, which is not limited herein.

[0057] The present invention changes from the original single hydraulic tightening to the cooperation of hydraulic tightening and mechanical locking, which can ensure that the ejector rod 221 remains fixed all the time when the connecting rod 5 is fractured, and there will be no loosening or retraction of the pressing mechanism 2 when the connecting rod 5 is fractured. Further, by making the part of the connecting rod 5 close to the pressing mechanism 2 not need to bear the force opposite to the force provided by the pressing mechanism 2 during the fracture process, the force movement direction after the connecting rod 5 is fractured is the same as the direction of the force applied by the pressing mechanism 2, avoiding the situation that most of the force received by the fractured end of the connecting rod 5 and the force applied by the pressing mechanism 2 to the connecting rod 5 cancel each other out, and further avoiding the displacement of the pressing mechanism 2 due to the reverse fracture force generated when the connecting rod 5 is fractured. Therefore, the connecting rod fracture device provided by the present invention can not only avoid the fracture deviation of the connecting rod 5 caused by the displacement of the ejector rod 221, but also improve the force effectively used for fracture. Therefore, it can make the fracture part more likely to reach the ideal fracture surface quality, effectively ensure the size consistency of each connecting rod 5 during fracture, reduce the debris generated due to the unsmooth fracture process, and effectively improve the product quality and accuracy of the connecting rod 5 fracture.

[0058] In some embodiments of the present invention, as shown in the attached Figure 4 figure, the locking part 222 is a groove structure, and the anti-retreat device 21 penetrates into the locking part 222 at least. Specifically, in some embodiments, the locking part 222 is an embedded groove structure, and the anti-retreat device 21 is completely or partially embedded in the locking part 222 to prevent the ejector rod 221 from retreating when the connecting rod 5 is fractured; in other embodiments, the locking part 222 is one or more groove structures arranged on the outer edge of the pressing assembly 22, and the anti-retreat device 21 is at least partially embedded in the groove structure to play a mechanical blocking role on the pressing assembly 22 to prevent the connecting rod 5 from displacing when the ejector rod 221 is fractured. The locking part 222 of this method can be several, preferably symmetrically designed. Further, the groove structure can be linear, arc-shaped or other shapes, which are specifically selected according to the actual product use requirements and are not limited herein.

[0059] In some embodiments of the present invention, as shown in the attached Figure 4As shown, in order to make the connection between the anti-retreat device 21 and the pressing component 22 more firm and restrict the displacement of the pressing component 22 as a whole, the locking portion 222 is a locking groove penetrating through the pressing component 22. The locking groove has only two openings in the penetrating direction to form a penetrating channel. The locking groove is restricted in the linear direction determined by these two openings, which can provide a guiding path for the anti-retreat device 21, enabling the anti-retreat device 21 to move only along the penetrating direction of the locking groove and restricting the displacement of the anti-retreat device 21 in other directions. Moreover, when the bursting force of the connecting rod 5 acts on the ejector rod 221 and causes the ejector rod 221 to tend to move along the bursting force, the anti-retreat device 21 will contact the groove wall in the locking groove and exert a reaction force of restraint on the pressing component 22, thereby realizing the restriction of the displacement of the pressing component 22 and ensuring the stability and reliability of the pressing component 22 during operation.

[0060] Preferably, the grooving direction of the locking portion 222 is perpendicular to the force application direction of the pressing component 22, so that it is difficult for external vibration to generate a force that causes the anti-retreat device 21 to disengage from the locking portion 222, which can prevent the anti-retreat device 21 from disengaging from the locking portion 222 due to forces such as vibration, making the connection of the entire pressing mechanism 2 more stable. And when the grooving direction of the locking portion 222 is not perpendicular to the force application direction of the pressing component 22, a huge bursting force during the bursting of the connecting rod 5 may generate a shearing force on the locking portion 222. After the pressing mechanism 2 operates for a long time, this repeated shearing force will cause wear or deformation to the locking portion 222, affecting its service life. Further, the anti-retreat device 21 can move along the grooving direction of the locking portion 222. Furthermore, when the anti-retreat device 21 and the locking portion 222 are perpendicular to each other, the anti-retreat device 21 can bear the main pressure from the bursting of the connecting rod 5 and transfer and disperse the pressure, effectively reducing the adverse effect of the shearing force on the locking portion 222.

[0061] In some embodiments of the present invention, as shown in the appended Figure 4 and the appended Figure 5 As shown, the anti-retreat device 21 has a first abutting surface 71, and the locking portion 222 has a second abutting surface 72. The first abutting surface 71 and the second abutting surface 72 are two mutually cooperating surfaces. When switching to the locked state, the first abutting surface 71 and the second abutting surface 72 are mutually attached. The anti-retreat device 21 transmits a force parallel and identical to the force application direction of the ejector rod 221 to the second abutting surface 72 of the locking portion 222 through the first abutting surface 71, so that the anti-retreat device 21 can more effectively resist the displacement trend that the ejector rod 221 may occur when the connecting rod 5 bursts. Preferably, the roughness of the first abutting surface 71 and the second abutting surface 72 is not greater than Ra1.6.

[0062] In some embodiments of the present invention, as shown in the appended Figure 4 and the appended Figure 5As shown, both the first abutting surface 71 and the second abutting surface 72 are inclined surfaces. Preferably, the part of the anti-return device 21 extending into the locking part 222 is a wedge-shaped structure. This is because there are tolerances in the length of the bolt holes of the connecting rod 5. When the ejector rod 221 abuts against the two bolt supporting surfaces on both sides of the big end of the connecting rod 5, the position of the ejector rod 221 will keep changing due to these tolerances, becoming a variable that cannot be accurately predicted. The uncertainty of the position of the ejector rod 221 makes the position of the anti-return device 21 when it presses against and locks the connecting rod 5 also have slight deviations. When the first abutting surface 71 and the second abutting surface 72 are inclined surfaces, the relative sliding and adjustment between the inclined surfaces can automatically adapt to this change. The anti-return device 21 and the locking part 222 can reach a stable fitting state again through the relative displacement of the first abutting surface 71 and the second abutting surface 72, ensuring that the locking effect is not affected by the position variable of the ejector rod 221 to achieve a stable locking state. Preferably, the angles of the first abutting surface 71 and the second abutting surface 72 are 5-7°.

[0063] In some embodiments of the present invention, as shown in the appendix Figure 5 As shown, the anti-return device 21 has a third abutting surface 73. The third abutting surface 73 and the first abutting surface 71 are respectively located on both sides of the anti-return device 21 in the force application direction of the ejector rod 221; the pressing assembly 22 further includes a fourth abutting surface 74, and the fourth abutting surface 74 is located in the penetrating direction of the locking part 222; the anti-return device 21 can penetrate through the locking part 222, and the third abutting surface 73 on the penetrated part abuts against the fourth abutting surface 74 and applies a force parallel and opposite to the force application direction of the ejector rod 221 to the fourth abutting surface 74, which can form a balance system with the force between the first abutting surface 71 and the second abutting surface 72, preventing the locking part 222 from deforming due to unilateral force, and further enhancing the stability of the entire structure. Preferably, the third abutting surface 73 and the fourth abutting surface 74 are arc surfaces for better fitting.

[0064] In some embodiments of the present invention, as shown in the appendix Figure 4 and in the appendix Figure 5As shown, the pressing component 22 further includes a supporting portion 223 and a movable portion 226. The movable portion 226 is fixedly connected to the ejector rod 221 and drives the ejector rod 221 to move along the force application direction. The locking portion 222 is located on the movable portion 226. The supporting portion 223 has a first through groove 2231 and a second through groove 2232 that communicate with each other. The grooving direction of the first through groove 2231 is perpendicular to the grooving direction of the second through groove 2232 and is the same as the force application direction of the anti-retreat device 21. The movable portion 226 moves within the first through groove 2231. A part of the anti-retreat device 21 moves within the second through groove 2232. The first through groove 2231 and the second through groove 2232 play a role of guiding and limiting. That is, the first through groove 2231 provides a specific movement path for the movable portion 226 and the ejector rod 221 connected thereto, enabling it to move only along the grooving direction of the first through groove 2231 and in the same direction as the force application direction of the anti-retreat device 21, avoiding deviation in the force application direction. And the second through groove 2232 limits the movement trajectory of a part of the anti-retreat device 21, enabling it to move only on a specific path perpendicular to the grooving direction of the first through groove 2231. On the other hand, the fourth abutting surface 74 is located on the second through groove 2232 and the locking portion 222. When the anti-retreat device 21 switches to the locked state, the third abutting surface 73 fits with the fourth abutting surface 74, which can more stably switch the anti-retreat device 21 to the locked state, ensuring the stability of the entire structure during the processes such as the force application of the ejector rod 221 and the locking of the anti-retreat device 21. Specifically, before the connecting rod 5 is burst, the ejector rod 221 moves along the force application direction under the action of the movable portion 226. During this process, the movable portion 226 moves within the first through groove 2231 to ensure the accuracy of the force application direction and position of the ejector rod 221. Then the anti-retreat device 21 moves within the second through groove 2232, making the first abutting surface 71 and the second abutting surface 72 fit with each other, and the third abutting surface 73 and the fourth abutting surface 74 fit with each other, thereby switching the anti-retreat device 21 to the locked state and more stably restricting the retreat of the ejector rod 221.

[0065] In certain embodiments of the present invention, as shown in the attached Figure 4 and attached Figure 5As shown, since the support portion 223 needs to be connected to other components on the connecting rod fracture splitting device, threaded holes need to be opened on its surface. This machining requirement for opening threaded holes limits the heat treatment process of the support portion 223. Therefore, the heat treatment hardness of the support portion 223 cannot be made particularly high, which results in poor wear resistance of the support portion 223. During long-term use, it is prone to wear due to the friction of the third abutting surface 73 of the anti-return device 21. Moreover, the support portion 223 is usually a relatively complex integral component in the entire structure. Once worn, it is difficult to achieve rapid replacement, affecting the maintenance efficiency and usage cost of the device. Therefore, the pressing assembly 22 further includes a first sleeve 224 and a second sleeve 225 fixedly arranged on both sides of the second through groove 2232 located in the first through groove 2231. The first sleeve 224 and the second sleeve 225 have high hardness. The anti-return device 21 includes an anti-return rod 211. The anti-return rod 211 is slidably matched with the first sleeve 224, and the part of the anti-return rod 211 passing through the locking portion 222 can be slidably matched with the second sleeve 225. During the movement of the anti-return device 21, it no longer directly contacts the support portion 223, but contacts the high-hardness first sleeve 224 and second sleeve 225, thereby avoiding the direct wear of the anti-return device 21 on the support portion 223, effectively extending the service life of the support portion 223, and further increasing the service life of the entire pressing mechanism 2.

[0066] Furthermore, as shown in the appendix Figure 5 As shown, the third abutting surface 73 and the first abutting surface 71 are respectively located on both sides of the anti-return rod 211 in the force application direction of the ejector rod 221. The fourth abutting surface 74 is arranged on the inner wall of the second sleeve 225. Moreover, the anti-return rod 211 further has a fifth abutting surface 75, and the inner wall of the first sleeve 224 has a sixth abutting surface 76. The fifth abutting surface 75 and the sixth abutting surface 76 are circumferentially matched. That is, when the anti-return rod 211 switches to the locked state, the third abutting surface 73 and the fourth abutting surface 74 cooperate with each other, and the fifth abutting surface 75 and the sixth abutting surface 76 cooperate with each other, supporting the anti-return rod 211 from two dimensions of the axial direction and the circumferential direction, enabling the anti-return rod 211 to withstand high-intensity forces and effectively preventing the ejector rod 221 from retracting when the connecting rod 5 fractures.

[0067] In some embodiments of the present invention, the movable portion 226 includes two movable rods, both the ejector rod 221 and the locking portion 222 are two. The movable rods are fixedly connected to the ejector rod 221 in a one-to-one correspondence, and each movable rod is provided with a locking portion 222. Compared with a single structure, it can provide support and acting forces at multiple positions, making the entire pressing mechanism 2 more stable during operation.

[0068] In some embodiments of the present invention, as shown in the appendix Figure 4As shown, the backstop device 21 further includes a driving part 212, which is fixed on the support part 223, and its movable end is fixed to the backstop rod 211 to drive the backstop rod 211 to move in the second through slot 2232. The driving part 212 is preferably a backstop motor or a cylinder, which is not limited here.

[0069] In certain embodiments of the present invention, as shown in the attached Figure 1 and attached Figure 6 As shown, the movable and fixed sleeve 3 includes a separable movable sleeve 31 and a fixed sleeve 32, the fixed sleeve 32 is arranged on the side close to the clamping mechanism 2 and is fixedly connected to the base 1, the movable sleeve 31 is arranged on the side away from the clamping mechanism 2 and is fixedly connected to the moving mechanism 6, the movable sleeve 31 is provided with a seventh abutting surface 77, the pull rod 4 has an eighth abutting surface 78, and the eighth abutting surface 78 is arranged toward the moving mechanism 6. When the connecting rod 5 is broken, the eighth abutting surface 78 can fit with the seventh abutting surface 77 and apply a force parallel to and the same as the force direction of the clamping mechanism 2 to the seventh abutting surface 77, that is, the force applied by the pull rod 4 can directly act on the movable sleeve 31, and when the movable sleeve 31 drives the moving mechanism 6 to move, most of the connecting rods 5 move with the movable sleeve 31 to generate tension. The part of the connecting rod 5 close to the clamping mechanism 2 does not need to bear the force opposite to the force provided by the clamping mechanism 2 during the expansion and breaking process, and the direction of the force movement of the connecting rod 5 after the expansion and breaking is consistent with the direction of the force applied by the clamping mechanism 2, avoiding the situation where the force on the expansion and breaking end of the connecting rod 5 and the force applied by the clamping mechanism 2 to the connecting rod 5 offset each other for the most part, thereby increasing the effective force used for expansion and breaking, making it more likely to achieve the ideal fracture surface quality at the expansion and breaking point, reducing the debris generated by the unsmooth expansion and breaking process, and effectively improving the product quality of the expansion and breaking connecting rod 5. In addition, the clamping mechanism 2 fixes the bolt support surfaces on both sides of the big end of the connecting rod 5, and the fixed sleeve 32 also has a restraining effect on the big end of the connecting rod 5, so that the big end of the connecting rod 5 on the other side of the expansion and breaking point is fixed, so that the connecting rod 5 is expanded and broken at a preset position. Preferably, the movable sleeve 31 is detachably fixedly connected to the moving mechanism 6, and the fixed sleeve 32 is detachably fixedly connected to the base 1, and can be replaced according to connecting rods 5 of different sizes or shapes, thereby improving the versatility of the connecting rod expansion and breaking equipment.

[0070] In certain embodiments of the present invention, as shown in the attached Figure 6 As shown, the seventh abutment surface 77 and the eighth abutment surface 78 are both inclined surfaces. Preferably, the portion of the pull rod 4 extending into the movable sleeve 3 is a wedge-shaped structure. This is because the diameter of the connecting rod 5 is within tolerance. When the outer wall of the movable sleeve 3 abuts against the inner wall of the large end of the connecting rod 5, the position of the movable sleeve 3 will keep changing due to the existence of these tolerances, becoming a variable that cannot be accurately predicted. The uncertainty of the position of the movable sleeve 3 will further affect the breaking position and the force applied when the pull rod 4 breaks the connecting rod 5. When the seventh abutment surface 77 and the eighth abutment surface 78 are inclined surfaces, the relative sliding and adjustment between the inclined surfaces can automatically adapt to this change, thereby improving the quality and consistency of the breaking of the connecting rod 5.

[0071] In certain embodiments of the present invention, as shown in the appended Figure 1 and the appended Figure 6 figures, the moving mechanism 6 includes a slide plate 61 and a slider 62. The slide plate 61 is connected to the slider 62, and a part of the connecting rod 5 is positioned and installed on the slide plate 61. The slide plate 61 is provided with a slide rail 611, and the setting direction of the slide rail 611 is consistent with the direction of the bursting force. The slider 62 can convert the force exerted on the seventh abutting surface 77 by the eighth abutting surface 78 into its own movement on the slide rail 611, and transfer the received bursting force from the driven fixed sleeve 3 to the moving mechanism 6, so as to synchronously drive the slide plate 61 and a part of the connecting rod 5 provided on the slide plate 61 to move.

[0072] In certain embodiments of the present invention, as shown in the appended Figure 1 and the appended Figure 6 figures, the connecting rod bursting device further includes a driving device 8 and a piston rod 9 for driving the pull rod 4. The driving device 8 is connected to the piston rod 9 through a T-shaped block connecting shaft 91, and the piston rod 9 is connected to the pull rod 4. When it is necessary to burst the connecting rod 5, the driving device 8 provides power to the pull rod 4 to pull down the pull rod 4. Further, the end face of the T-shaped block connecting shaft 91 is arc-shaped to prevent the instability between the seventh abutting surface 77 and the eighth abutting surface 78 caused by force problems, such as the stress concentration between the seventh abutting surface 77 and the eighth abutting surface 78.

[0073] In certain embodiments of the present invention, in order to further evenly distribute the stress provided by the driving device 8, the top end of the T-shaped block connecting shaft 91 is provided with a chamfer, which helps to improve the strength and durability of the T-shaped block connecting shaft 91, especially in the case of bearing impact loads or frequent vibrations.

[0074] In certain embodiments of the present invention, as shown in the appended Figure 1 and the appended Figure 6 figures, the height of the moving and fixed sleeve 3 is greater than the thickness of the connecting rod 5. Among them, the part protruding from the large end of the connecting rod 5 is provided with a chamfer for dispersing the bursting force applied to the large end of the connecting rod 5, which helps to avoid unnecessary cracks or tears generated at the large end of the connecting rod 5 during bursting and improve the bursting quality. And it protects the surface of the inner wall of the connecting rod 5 when it is assembled onto the moving and fixed sleeve 3 to avoid wear or scratches.

[0075] In certain embodiments of the present invention, as shown in the appended Figure 1As shown, a detachable fixed plate 612 is provided on the skateboard 61, and a positioning block 613 for positioning the small end of the positioning link 5 is provided on the fixed plate 612. During the production process, when it is necessary to replace the production of links 5 of different sizes, simply disassemble and replace the fixed plate 612 and the movable and fixed sleeves 3 with positioning blocks 613 of corresponding sizes, without the need for large-scale adjustment or modification of the entire link expanding and breaking equipment, enabling the link expanding and breaking equipment to adapt to the processing requirements of a variety of links 5 of different sizes, effectively improving the versatility.

[0076] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantive changes and substitutions made by those skilled in the art based on the present invention fall within the scope of protection required by the present invention.

Claims

1. A connecting rod expansion and breaking device, characterized in that: include Pedestal; A clamping mechanism is arranged on the base and can move relative to the base, the clamping mechanism includes a backstop device and a clamping assembly, the clamping assembly has a push rod abutting against the bolt support surfaces on both sides of the big end of the connecting rod, the clamping assembly is also provided with a locking part, the opening direction of the locking part is at an angle to the force application direction of the clamping assembly, and the locking part is used to cooperate with the backstop device so that the backstop device has a locking state that limits the push rod from retreating when the connecting rod is expanded and broken, so as to abut against the bolt support surfaces on both sides of the big end of the connecting rod; A movable sleeve, the large end of the connecting rod is sleeved on the outer periphery of the movable sleeve; The pull rod at least partially penetrates into the movable sleeve and can apply a force to the movable sleeve in a direction parallel to and the same as the force applied by the clamping mechanism, so as to break the large end of the connecting rod; The moving mechanism is used to drive the part of the connecting rod that has been broken after expansion when the pulling rod applies force, and move relative to the base in a direction parallel to and the same as the force direction applied by the clamping mechanism.

2. The connecting rod expansion and breaking device according to claim 1, characterized in that: The locking portion is a groove structure, and the anti-retraction device at least penetrates into the locking portion.

3. The connecting rod expansion and breaking device according to claim 2, characterized in that: The locking portion is a locking groove that penetrates the clamping assembly, and the locking groove has only two openings in the penetrating direction.

4. The connecting rod expansion and breaking device according to claim 2, characterized in that: The anti-retraction device has a first abutting surface, and the locking portion has a second abutting surface. The first abutting surface can be in contact with the second abutting surface and apply a force to the second abutting surface that is parallel to and the same as the force direction of the push rod.

5. The connecting rod expansion and breaking device according to claim 4, characterized in that: The first abutting surface and the second abutting surface are both inclined surfaces.

6. The connecting rod expansion and breaking device according to claim 4, characterized in that: The anti-retraction device has a third abutment surface, and the third abutment surface and the first abutment surface are respectively located on both sides of the anti-retraction device in the force application direction of the push rod; the clamping assembly also includes a fourth abutment surface, and the fourth abutment surface is located in the penetration direction of the locking portion; The anti-retraction device can pass through the locking portion, and the third abutting surface on the passing portion is in contact with the fourth abutting surface and applies a force parallel to and opposite to the force direction of the push rod to the fourth abutting surface.

7. The connecting rod expansion and breaking device according to claim 6, characterized in that: The clamping assembly further includes a supporting portion and a movable portion, wherein the movable portion is fixedly connected to the push rod and drives the push rod to move along the force application direction; the locking portion is located on the movable portion; The support portion has a first through slot and a second through slot that are connected to each other, the slot direction of the first through slot is perpendicular to the slot direction of the second through slot and is the same as the force direction of the back-stop device, and the movable portion moves in the first through slot; Part of the anti-retraction device moves in the second through groove to cooperate with the locking portion on the movable portion to limit the push rod from retreating when the connecting rod is expanded and broken.

8. The connecting rod expansion and breaking device according to claim 7, characterized in that: The clamping assembly further comprises a first sleeve and a second sleeve fixedly arranged on both sides of the second through slot located at the first through slot; the backstop device comprises a backstop rod, the backstop rod is slidably matched with the first sleeve, and the portion of the backstop rod passing through the locking portion can be slidably matched with the second sleeve, the third abutting surface and the first abutting surface are respectively located on both sides of the backstop rod in the force application direction of the push rod, and the fourth abutting surface is arranged on the inner wall of the second sleeve; The back-stop rod also has a fifth abutment surface, the inner wall of the first sleeve has a sixth abutment surface, and the fifth abutment surface and the sixth abutment surface are circumferentially matched.

9. The connecting rod expansion and breaking device according to claim 1, characterized in that: The movable and fixed sleeves include a separable movable sleeve and a fixed sleeve, the fixed sleeve is arranged on a side close to the clamping mechanism and is fixedly connected to the base, the movable sleeve is arranged on a side away from the clamping mechanism and is fixedly connected to the movable mechanism, the movable sleeve is provided with a seventh abutment surface, the pull rod has an eighth abutment surface and the eighth abutment surface is arranged toward the movable mechanism, the eighth abutment surface can be in contact with the seventh abutment surface and apply a force parallel to and the same as the force direction of the clamping mechanism to the seventh abutment surface, so as to break the big end of the connecting rod, and the movable mechanism can drive the broken part of the connecting rod to move relative to the base along the direction of the force when the eighth abutment surface applies force.

10. The connecting rod expansion and breaking device according to claim 1, characterized in that: It also includes a driving device and a piston rod for driving the pull rod, the driving device is connected to the piston rod through a T-block connecting shaft, the piston rod is connected to the pull rod, and the end surface of the T-block connecting shaft is arc-shaped.

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