A six-sides press rod pressure bearing structure capable of preventing thread fatigue fracture of a pull rod
Patent Information
- Application Number
- CN202611294413.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-25
- Publication Date
- 2026-09-29
AI Technical Summary
六面顶压机为高频连续作业设备，长期反复高压冲击下，拉杆前两牙螺纹存在严重的应力集中现象，拉杆断裂故障会直接导致压机机架松动、压力失衡，不仅造成设备停机维修、生产中断，还存在高压设备安全隐患，目前行业内无针对性的应力分摊结构，仅能通过更换高强度拉杆、定期检测排查的方式降低故障，无法从根源解决螺纹应力集中疲劳断裂的核心问题，设备使用成本与维护成本居高不下
1、本发明通过设置承压套和承压开槽的添加，解决了现有传统拉杆装配结构中，压机油缸推出高压载荷全部集中作用于拉杆螺丝的第一牙、第二牙螺纹位置，后端螺纹基本不受力。六面顶压机为高频连续作业设备，长期反复高压冲击下，拉杆前两牙螺纹存在严重的应力集中现象，拉杆断裂故障会直接导致压机机架松动、压力失衡，不仅造成设备停机维修、生产中断，还存在高压设备安全隐患问题，达到了对受力效果进行优化、改造的通用性强、运行安全稳定和降本增效的效果。
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Figure CN122828622A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of superhard material synthesis press technology, specifically to a six-sided top press tie rod bearing structure that prevents fatigue fracture of tie rod threads. Background Technology
[0002] The six-sided top press is a core high-pressure device for synthesizing superhard materials such as diamond and cubic boron nitride. The equipment relies on multiple sets of tie rods to lock and fix the frame, and uses hydraulic cylinders to push outwards, creating an ultra-high-pressure synthesis environment inside. The six-sided top press is a high-frequency continuous operation device. In existing traditional tie rod assembly structures, the high-pressure load from the press cylinder is concentrated on the first and second threads of the tie rod screw, while the rear thread is essentially unloaded. Six-sided presses are high-frequency, continuous operation equipment. Under long-term, repeated high-pressure impacts, severe stress concentration occurs in the first two threads of the tie rod. Tie rod breakage directly leads to press frame loosening and pressure imbalance, causing not only equipment downtime and production interruptions but also posing safety hazards to the high-pressure equipment. Currently, there is no targeted stress-sharing structure in the industry; failures can only be mitigated by replacing the tie rod with a high-strength one and conducting regular inspections. This fails to address the core issue of thread stress concentration and fatigue fracture at its root, resulting in persistently high equipment operating and maintenance costs. Summary of the Invention
[0003] To address the problems mentioned in the background section, the present invention aims to provide a six-sided top press tie rod bearing structure for preventing fatigue fracture of the tie rod thread. This structure offers advantages such as strong versatility in optimizing and modifying the stress distribution, safe and stable operation, and cost reduction and efficiency improvement. It solves the problem in existing traditional tie rod assembly structures where the high-pressure load from the press cylinder is concentrated on the first and second threads of the tie rod screw, leaving the rear thread largely unaffected. Six-sided top presses are high-frequency continuous operation equipment. Under long-term repeated high-pressure impacts, severe stress concentration occurs in the first two threads of the tie rod. Tie rod fracture directly leads to press frame loosening and pressure imbalance, causing not only equipment downtime and production interruptions but also posing safety hazards to the high-pressure equipment. Currently, there is no targeted stress-sharing structure in the industry; failures can only be mitigated by replacing the tie rod with a high-strength one and conducting regular inspections. This fails to address the core problem of thread stress concentration and fatigue fracture at its root, resulting in high equipment operating and maintenance costs.
[0004] To achieve the above objectives, the present invention provides the following technical solution: a six-sided top press tie rod bearing structure for preventing fatigue fracture of the tie rod thread, comprising a press body, a tie rod, and a transmission through hole. The top of the press body is provided with a transmission through hole for connecting to a high-pressure hydraulic cylinder, and the bottom of the press body is provided with a pressure transmission groove. The threaded assembly section of the tie rod is provided with a pressure-bearing sleeve with different sizes of cut-out. Locking nuts are movably connected to the upper and lower ends of the tie rod.
[0005] As a preferred embodiment of the present invention, the pressure-bearing sleeve is configured as a truncated cone structure with a larger upper part and a smaller lower part. The top of the press body is provided with a pressure-bearing groove that engages with the pressure-bearing sleeve. The inner wall of the pressure-bearing groove fits with the outer circle of the pull rod. The outer wall of the top of the press body matches and fits with the conical surface of the locking nut.
[0006] As a preferred embodiment of the present invention, the pressure sleeve adopts a bi-longitudinal split structure, which requires butt joint processing and can be quickly fitted onto the threaded stress section of the tie rod without any assembly interference.
[0007] As a preferred embodiment of the present invention, when the high-pressure cylinder is in pressurized working state, the pressure-bearing sleeve and the locking nut simultaneously bear the high-pressure working load and jointly share the concentrated stress of the first and second threads of the threaded assembly section of the tie rod.
[0008] As a preferred embodiment of the present invention, the pressure sleeve is made of high-strength alloy material, and its hardness and compressive strength are matched with those of the tie rod material, thus possessing high-pressure fatigue resistance.
[0009] As a preferred embodiment of the present invention, the top of the locking nut is provided with a plurality of drive holes for related transmission of the locking nut, the bottom of the locking nut is provided with a plurality of transmission rods, and the top of the pressure sleeve is provided with a transmission hole for related docking and transmission with the transmission rods.
[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention, by adding a pressure-bearing sleeve and pressure-bearing slot, solves the problem in existing traditional tie rod assembly structures where the high-pressure load from the press cylinder is concentrated on the first and second threads of the tie rod screw, leaving the rear thread largely unloaded. The six-sided top press is a high-frequency continuous operation device; under long-term repeated high-pressure impacts, the first two threads of the tie rod exhibit severe stress concentration. Tie rod breakage directly leads to press frame loosening and pressure imbalance, causing not only equipment downtime and production interruptions but also posing safety hazards to the high-pressure equipment. This invention achieves the effects of optimizing and modifying the stress distribution, ensuring strong versatility, stable operation, and cost reduction and efficiency improvement.
[0011] 2. This invention, through the addition of a pressure-bearing sleeve and a pressure-bearing slot, utilizes a high-strength alloy integrally machined and longitudinally split, resulting in excellent elastic clamping performance. Under high pressure, there is no loosening or shifting, and the force is evenly distributed. The pressure-bearing sleeve's tapered surface fit structure enables automatic centering and clamping, achieving high assembly precision and compatibility with various standard press rods. Furthermore, the overall structure requires no modification to the press frame, cylinder, or main rod structure, making modification simple, disassembly and assembly convenient, and offering wide adaptability. During installation, the halved pressure-bearing sleeve is fitted onto the press rod... After the pressure-bearing sleeves are closed, the external locking nuts are rotated by the connecting wrench on the threaded surfaces at both ends of the rod. The rotation of the locking nuts drives the pressure-bearing sleeves to rotate and lock through the connection of the transmission rod and the transmission hole, so that the pressure-bearing sleeves tightly hug the relevant stress areas of the pull rod, thus completing the relevant assembly and fixation of the structure. When the device is working, the high pressure load is transmitted to the locking nuts and the pressure-bearing sleeves. The locking nuts and the pressure-bearing sleeves jointly bear the main pressure, while the threads of the pull rod only bear a small part of the load, thus achieving a 50 / 50 distribution of the force. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the main body of the press. Figure 3 This is a schematic diagram of the disassembled structure of the present invention; Figure 4 Provided for embodiments of the present invention Figure 3 A magnified view of a portion of point A in the middle.
[0013] In the diagram: 1. Press body; 2. Tie rod; 3. Transmission through hole; 4. Pressure-bearing slot; 5. Pressure transmission groove; 6. Locking nut; 7. Pressure-bearing sleeve; 8. Drive hole; 9. Transmission rod; 10. Transmission hole. Detailed Implementation
[0014] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0015] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.
[0016] Secondly, the term "one embodiment" or "example" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the invention. The appearance of an embodiment in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.
[0017] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.
[0018] Example 1 Reference Figure 1-4 The first embodiment of the present invention provides a six-sided top press tie rod bearing structure for preventing fatigue fracture of the tie rod thread, including a press body 1, a tie rod 2 and a transmission through hole 3. The top of the press body 1 is provided with a transmission through hole 3 for connecting to a high-pressure oil cylinder, and the bottom of the press body 1 is provided with a pressure transmission groove 5. The threaded assembly section of the tie rod 2 is provided with a pressure-bearing sleeve 7 with different sizes of cut-out. The upper and lower ends of the tie rod 2 are movably connected with locking nuts 6.
[0019] Specifically, by adding the pressure-bearing sleeve 7 and the pressure-bearing slot 4, the problem of concentrated high-pressure loads from the press cylinder being applied entirely to the first and second threads of the tie rod screw in the existing traditional tie rod assembly structure is solved, leaving the rear thread largely unloaded. The six-sided top press is a high-frequency continuous operation device. Under long-term repeated high-pressure impacts, the first two threads of the tie rod exhibit severe stress concentration. Tie rod breakage directly leads to press frame loosening and pressure imbalance, causing not only equipment downtime and production interruptions but also posing safety hazards to the high-pressure equipment. This solution achieves the effects of optimizing and modifying the stress distribution, resulting in strong versatility, safe and stable operation, and cost reduction and efficiency improvement.
[0020] Furthermore, the split-type pressure sleeve 7 is fitted onto the threaded assembly section of the pull rod 2, and the pull rod 2 is installed through the transmission through hole 3 and the pressure transmission groove 5 on the press body 1. Then, lock nuts 6 are connected to the upper and lower ends of the pull rod 2, so that the pressure sleeve 7 and the lock nuts 6 are in contact with the relevant pressure-bearing parts of the press body 1. During operation, the huge pressure generated by the high-pressure cylinder is transmitted to the press body 1 through the transmission through hole 3, and the high-pressure load is transmitted to the pull rod 2. At this time, the lock nuts 6 and the pressure sleeve 7 fitted onto the threaded section of the pull rod 2 simultaneously bear the high-pressure working load.
[0021] Example 2 In the second embodiment of the present invention, the following technical solution is adopted: the pressure-bearing sleeve 7 is configured as a truncated cone structure with a larger upper part and a smaller lower part; a pressure-bearing groove 4 is formed on the top of the press body 1 to engage with the pressure-bearing sleeve 7; the inner wall of the pressure-bearing groove 4 fits against the outer circle of the pull rod 2; the outer wall of the top of the press body 1 matches and fits against the conical surface of the locking nut 6; the pressure-bearing sleeve 7 adopts a longitudinally split structure, which requires butt-jointing processing, and can be quickly fitted onto the threaded force-bearing section of the pull rod 2 without assembly interference. The high-pressure cylinder operates under pressure. In this state, the pressure-bearing sleeve 7 and the locking nut 6 simultaneously bear the high-pressure working load and share the concentrated stress of the first and second threads of the threaded assembly section of the tie rod 2. The pressure-bearing sleeve 7 is made of high-strength alloy material, and its hardness and compressive strength are matched with the material of the tie rod, and it has high-pressure fatigue resistance. The top of the locking nut 6 is provided with several drive holes 8 for related transmission of the locking nut 6, and the bottom of the locking nut 6 is provided with several transmission rods 9. The top of the pressure-bearing sleeve 7 is provided with a transmission hole 10 for related docking and transmission with the transmission rods 9.
[0022] Specifically, by adding the pressure-bearing sleeve 7 and the pressure-bearing slot 4, the pressure-bearing sleeve 7 is made of high-strength alloy and longitudinally split after integral machining, resulting in good elastic clamping effect. Under high pressure, there is no loosening or displacement, and the force is evenly distributed. Through the matching structure of the large and small conical surfaces of the pressure-bearing sleeve 7, automatic centering and clamping can be achieved, with high assembly accuracy. It is compatible with various standard press rods 2. At the same time, the overall structure does not require modification of the press frame, oil cylinder, or main structure of the pull rod 2. It is simple to modify, easy to disassemble and assemble, and has wide adaptability. During installation, the half-split pressure-bearing sleeve 7 is fitted onto both ends of the pull rod 2. After the pressure-bearing sleeve 7 is closed, the external locking nut 6 is rotated by the connecting wrench. The rotation of the locking nut 6 drives the pressure-bearing sleeve 7 to rotate and lock through the connection of the transmission rod 9 and the transmission hole 10, so that the pressure-bearing sleeve 7 tightly hugs the relevant stress area of the pull rod 2 to complete the relevant assembly and fixation of the structure. When the device is working, the high pressure load is transmitted to the locking nut 6 and the pressure-bearing sleeve 7. The locking nut 6 and the pressure-bearing sleeve 7 jointly bear the main pressure, while the thread of the pull rod 2 only bears a small part of the load, realizing the half distribution of the force.
[0023] Furthermore, during installation, the user places the halved pressure sleeve 7 onto the threaded surfaces at both ends of the pull rod 2. After closing the pressure sleeve 7, the user rotates the external locking nut 6 using a wrench. The rotation of the locking nut 6, through the connection of the transmission rod 9 and the transmission hole 10, drives the pressure sleeve 7 to rotate and lock, so that the pressure sleeve 7 tightly hugs the relevant stress area of the pull rod 2, completing the assembly and fixation of the structure. When the device is working, the high pressure load is transmitted to the locking nut 6 and the pressure sleeve 7. The locking nut 6 and the pressure sleeve 7 jointly bear the main pressure, while the thread of the pull rod 2 only bears a small portion of the load, achieving a 50 / 50 distribution of the force.
[0024] Working principle: During installation, the pressure sleeve 7, which is longitudinally split in half, is first fitted onto the threaded stress sections at both ends of the pull rod 2. Then, the locking nut 6 is screwed onto the end of the pull rod 2. A wrench or other tool is inserted into the drive hole 8 at the top of the locking nut 6 and rotated. The transmission rod 9 at the bottom of the locking nut 6 rotates accordingly and is inserted into the transmission hole 10 at the top of the pressure sleeve 7, causing the pressure sleeve 7 to rotate synchronously. This makes the outer conical surface of the pressure sleeve 7 fit tightly against the inner conical surface of the pressure slot 4 on the press body 1, achieving automatic centering and clamping. During operation, the huge pressure generated by the high-pressure cylinder is transmitted to the press body 1 through the transmission through hole 3, and then acts on the pull rod 2. At this time, the locking nut 6 and the pressure sleeve 7 jointly bear the high-pressure load, dispersing the stress that was originally concentrated on the first two threads of the pull rod 2 thread section, effectively avoiding thread fatigue fracture.
[0025] In summary, through the cooperation of the press body 1, tie rod 2, transmission through hole 3, pressure-bearing slot 4, pressure transmission groove 5, locking nut 6, pressure-bearing sleeve 7, drive hole 8, transmission rod 9, and transmission hole 10, the effects of optimizing and modifying the force-bearing effect are achieved, resulting in strong versatility, safe and stable operation, and cost reduction and efficiency improvement.
[0026] The press body, locking nut, and tie rod used in this application can be additionally equipped with protective measures that are common knowledge in this technical field under different usage environments, including but not limited to the following methods, such as protective covers for equipment protection, dustproof nets for equipment dust prevention, and sealing components or waterproof coatings for equipment waterproofing, which are common technical means used by those skilled in the art.
[0027] It should be noted that the press body, locking nut and tie rod are existing devices or equipment, or devices or equipment that can be implemented by existing technology. The power supply, connection method, usage method, power source, fixing method, installation method, control method and other methods of the equipment, as well as the materials of each accessory and the selection of various parameters are common knowledge to those skilled in the art, and therefore will not be described in detail in this application document.
[0028] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any device-plus-function clause is intended to cover the structure described herein for performing the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.
[0029] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.
[0030] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.
[0031] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A six-sided jacking press tie rod bearing structure for preventing fatigue fracture of the tie rod thread, characterized in that: The press body (1), the pull rod (2) and the transmission through hole (3) are provided. The top of the press body (1) is provided with a transmission through hole (3) for connecting to the high pressure cylinder. The bottom of the press body (1) is provided with a pressure transmission groove (5). The threaded assembly section of the pull rod (2) is provided with a pressure sleeve (7) with different sizes. The upper and lower ends of the pull rod (2) are movably connected with locking nuts (6).
2. The six-sided jacking press tie rod bearing structure for preventing fatigue fracture of tie rod threads according to claim 1, characterized in that: The pressure-bearing sleeve (7) is configured as a truncated cone structure with a larger top and a smaller bottom. The top of the press body (1) is provided with a pressure-bearing slot (4) that engages with the pressure-bearing sleeve (7). The inner wall of the pressure-bearing slot (4) fits against the outer circle of the pull rod (2). The outer wall of the top of the press body (1) matches and fits against the conical surface of the locking nut (6).
3. The six-sided jacking press tie rod bearing structure for preventing fatigue fracture of the tie rod thread as described in claim 1, characterized in that: The pressure sleeve (7) adopts a split longitudinal structure, which requires butt joint processing. It can be quickly fitted onto the threaded force section of the tie rod (2) without any assembly interference.
4. The six-sided jacking press tie rod bearing structure for preventing fatigue fracture of tie rod threads according to claim 1, characterized in that: When the high-pressure cylinder is under pressure, the pressure-bearing sleeve (7) and the locking nut (6) simultaneously bear the high-pressure working load and share the concentrated stress of the first and second threads of the threaded assembly section of the tie rod (2).
5. The six-sided jacking press tie rod bearing structure for preventing fatigue fracture of tie rod threads according to claim 1, characterized in that: The pressure sleeve (7) is made of high-strength alloy material, and its hardness and compressive strength are matched with the material of the tie rod, thus possessing high-pressure fatigue resistance.
6. The six-sided jacking press tie rod bearing structure for preventing fatigue fracture of tie rod threads according to claim 1, characterized in that: The top of the locking nut (6) is provided with several drive holes (8) for related transmission of the locking nut (6), the bottom of the locking nut (6) is provided with several transmission rods (9), and the top of the pressure sleeve (7) is provided with a transmission hole (10) for related docking transmission with the transmission rods (9).