Threaded joint, connecting mechanism for a jolter and universal jolter

Abstract

This invention discloses a threaded connector, a connecting mechanism for a vibratory compactor, and a universal vibratory compactor, belonging to the field of building vibration compaction technology. The threaded connector of this invention has a locking hole extending inward from its surface; the locking hole includes a first connecting hole and a second connecting hole that are interconnected; wherein, the inner circumferential wall of the first connecting hole is machined with internal threads, and the second connecting hole is a smooth hole; the inner diameter of the second connecting hole is not less than the inner diameter of the first connecting hole, and the inner diameter of the second connecting hole is smaller than the major diameter of the internal thread. This invention optimizes the structure of the threaded connector, enabling secondary interference locking through the worn-out threads and the smooth hole even after the external threads on the impact connecting rod have worn out, effectively overcoming the technical bias of traditional technologies where threads need to be replaced once worn out. Furthermore, the effect on the impact connecting rod improves with the progression of wear, thus achieving a technological breakthrough of becoming increasingly robust with use.

Description

Technical Field

[0001] This invention belongs to the field of building vibration compaction technology, and more specifically, relates to a threaded connector, a connecting mechanism for a vibrator, and a universal vibrator. Background Technology

[0002] During building renovation, wall and floor tiles are often laid. With the development of the construction industry, people have gradually abandoned the traditional manual laying method and used a tile vibrator to lay wall and floor tiles. Compared with the traditional manual operation, it is not only time-saving and labor-saving, but also ensures the density of the tiles to the base layer and the flatness of the laying, thus improving work efficiency and laying quality.

[0003] However, the high-frequency vibration of paving vibrators accelerates the wear of components, especially threaded connections. Threads are prone to wear, loosening, and even stripping under continuous high-frequency vibration and impact, leading to decreased connection reliability, shortened overall equipment lifespan, and inability to meet long-term stable operation requirements.

[0004] Traditional hammer drill connecting rods typically use a combination of spring washers and flat washers. This has a fatal technical drawback under high-frequency impact conditions. When the hammer drill is working, the impact force is directly concentrated on a single point at the front end of the rod, resulting in a very small force-bearing surface and highly concentrated stress. The impact process continuously generates a reverse rebound force, causing the rod to move back and forth constantly. On the one hand, the repeated rebound force causes the entire row of threads to wear out and strip quickly. On the other hand, the fatigue of the rod metal continues to accumulate, increasing with use and making it extremely prone to fatigue fracture.

[0005] In addition, there is a type of integrated ball joint and connecting rod structure on the market, machined as a single part without threads or rivets. Because the front ball joint is relatively large and the rear connecting rod has a small diameter, under the high-frequency reciprocating impact of an electric hammer, the stress is concentrated entirely on the weakest section of the small connecting rod, preventing stress dispersion. Under long-term alternating vibration, this easily leads to metal fatigue, causing frequent breakage of the connecting rod from the middle or root, resulting in a short service life.

[0006] Therefore, how to further improve the service life of paving vibrators, especially by improving the wear resistance and anti-loosening performance of threaded connections and extending their working life, has always been a key technical issue of concern in this industry.

[0007] A search revealed existing patents related to vibratory compactors for tiling and stone laying, and the applicant has consistently focused on the research, design, and structural optimization of vibratory compactors. For example, the applicant disclosed a dedicated connection mechanism for a universal vibratory compactor in patent CN207393646U. This mechanism includes a connecting rod and a spherical joint. The spherical joint has a first connecting channel extending from its outer surface to its internal center. The connecting end of the connecting rod is inserted into the first connecting channel and fixed to the internal center of the spherical joint, ensuring that the connecting end is fully enclosed within the joint. This effectively improves the stress distribution at the connection point between the connecting rod and the spherical joint, thus overcoming the short lifespan of existing universal vibratory compactors.

[0008] For example, the applicant disclosed a vibratory compactor for floor tiles and stone, as well as its connecting mechanism and connector, in patent CN221001850U. In this application, a buffer ball is placed at the bottom of the mounting hole as a buffer element; that is, the buffer ball is first placed at the bottom of the mounting hole, and then the connecting end of the impact link is threaded into the mounting hole. The buffer ball causes a slight rotation during impact, creating a resonance buffering effect between the impact link and the buffer ball, thereby protecting the impact link and its threads and increasing the lifespan of the impact link.

[0009] All the above applications involve technical improvements to the vibratory compactor and can extend its service life to some extent, but there is still room for optimization. For example, in patent CN221001850U, although the threads on the impact linkage can be protected by setting a buffer ball and coating the surface of the connecting thread and / or the surface of the thread inside the mounting hole with an adhesive layer, this only slows down the friction of the threads. After long-term operation, the threads will still wear, causing the connection clearance to continue to increase, which will lead to loosening of the connection, axial movement, and eventually stripping, breakage, or even overall failure. Summary of the Invention

[0010] The problem to be solved To address at least some of the problems existing in the prior art, this invention proposes a threaded connector, a connecting mechanism for a vibrator, and a universal vibrator. This invention optimizes the structure of the threaded connector, ensuring that the threads on the impact linkage maintain a good locking effect even after wear, thereby further extending the service life of the vibrator.

[0011] Technical solution To solve the above problems, the technical solution adopted by the present invention is as follows: The present invention provides a threaded connector, wherein the threaded connector has a locking hole extending from its surface inward. The locking hole includes a first connecting hole and a second connecting hole that are interconnected; wherein, The inner circumferential wall of the first connecting hole is machined with internal threads, and the second connecting hole is a smooth hole; the inner diameter D2 of the second connecting hole is not less than the inner diameter D1 of the first connecting hole, and the inner diameter D2 of the second connecting hole is less than the major diameter D3 of the internal thread. The internal thread of the first connecting hole and the inner wall of the second connecting hole are successively engaged with the external thread assembled into the locking hole for threaded locking and interference locking.

[0012] In some embodiments, the difference between the major diameter D3 of the internal thread and the inner diameter D2 of the second connecting hole is greater than half of the thread profile height H.

[0013] In some embodiments, the inner diameter D1 of the first connecting hole is equal to the inner diameter D2 of the second connecting hole.

[0014] In some embodiments, the axial dimension L1 of the first connecting hole is not greater than the axial dimension L2 of the second connecting hole.

[0015] In some embodiments, the axial dimension ratio of the second connecting hole to the first connecting hole is 1.5-2.5.

[0016] A connecting mechanism for a vibrator according to the present invention includes an impact link and a connector; wherein, one end of the impact link is provided with an external thread; wherein, The connector is a type of threaded connector as described above; after assembly, a threaded locking structure is formed between the impact connecting rod and the first connecting hole; after the external thread wears down, it can be inserted into the second connecting hole and form an interference locking structure with the inner wall of the second connecting hole.

[0017] In some embodiments, the inner diameter D2 of the second connecting hole is between the major diameter D4 and the minor diameter D5 of the external thread.

[0018] In some embodiments, the external thread extends to the bottom of the impact link, and the axial dimension L3 of the external thread is greater than the axial dimension L1 of the first connecting hole and less than the axial dimension of the locking hole.

[0019] In some embodiments, the end of the impact link away from the external thread is machined with a mating part for connecting with an electric hammer or electric pick; The threaded connector is an overall spherical structure.

[0020] This embodiment also provides a universal vibratory compactor, including a vibratory plate and a connecting mechanism. The vibratory plate has a mounting groove machined on it that corresponds to the connector of the connecting mechanism. The connecting mechanism is one of the vibratory compactor connecting mechanisms described above; or... The connector described herein is one of the threaded connectors mentioned above.

[0021] Beneficial effects Compared with the prior art, the beneficial effects of the present invention are as follows: (1) A connecting mechanism for a vibrator according to the present invention divides the locking hole into a threaded connecting hole and a smooth hole that are interconnected. By controlling the relationship between the diameter of different sections of the locking hole and the major diameter of the internal thread, the external thread on the impact connecting rod can be slightly advanced axially after continuous impact wear. This allows multiple turns of the external thread to be sequentially engaged in the first connecting hole and form an interference fit with the inner wall of the smooth hole, thereby achieving a continuous transition from the threaded locking fit to the interference locking fit and further improving the service life of the vibrator. At the same time, as the depth of the impact connecting rod advances, the interference locking effect becomes better, effectively overcoming the technical bias of traditional technology where the thread needs to be replaced once it wears and fails.

[0022] (2) In a connecting mechanism for a vibrator according to the present invention, the inner diameter D2 of the second connecting hole is equal to the inner diameter D1 of the second connecting hole, so that the locking hole is a through hole as a whole. On the one hand, it can prevent the external thread from getting stuck in the second connecting hole immediately after wear, so as to extend the thread locking time of the external thread; on the other hand, the through hole is easy to process and has higher coaxiality accuracy.

[0023] (3) In a connecting mechanism for a vibrator of the present invention, the axial dimension of the second connecting hole is larger than that of the first connecting hole, so that after the external thread wears, the impact connecting rod can be axially displaced to the side of the second connecting hole. The longer second connecting hole can provide sufficient clearance stroke to ensure that the connecting rod can be smoothly inserted and form a stable interference lock, and will not cause problems such as jamming or ineffective fitting and locking due to insufficient axial space of the second connecting hole.

[0024] (4) A connecting mechanism for a vibrator according to the present invention controls the axial dimension of the external thread and the axial dimension of the first connecting hole and the locking hole, so that the unworn external thread can continue to form a thread lock with the internal thread, while the worn external thread can enter the second connecting hole to achieve interference lock, thereby realizing the simultaneous action of thread lock and interference lock in two modes, with double anti-loosening and greatly improved reliability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a connecting mechanism for a vibrator according to the present invention; Figure 2 This is a schematic diagram of the threaded connector in this invention; Figure 3 This is a schematic diagram of the locking hole in this invention; Figure 4 This is a schematic diagram of the impact linkage in this invention; Figure 5 for Figure 4 A magnified view of a portion of point A in the middle.

[0026] In the picture: 100. Threaded connector; 110. Locking hole; 111. First connecting hole; 1112. Second connecting hole; 200, Impact connecting rod; 210, External thread; 220, Connecting part. Detailed Implementation

[0027] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] As mentioned in the background section, existing vibratory compactors generally suffer from the technical problem that threaded connections are susceptible to high-frequency vibration impacts, leading to wear, loosening, stripping, and ultimately failure. While existing technologies have made a series of improvements, these primarily focus on protecting the threads.

[0030] Undeniably, strengthening thread protection is the most direct and effective way to delay the failure of threaded connections. However, regardless of the protection method used, it can only slow down the wear rate of the threads, but cannot prevent the threads from eventually wearing down and failing.

[0031] Meanwhile, existing technologies generally believe that after the threads wear down, the connection gap will inevitably increase and the locking will fail, requiring timely replacement, which greatly limits their service life.

[0032] Therefore, this application aims to overcome traditional technical biases, enabling the threads to maintain a good locking effect even after wear, without the need for immediate replacement, thereby further extending their service life.

[0033] This invention adopts a separate threaded assembly structure for the ball-head connector and the impact linkage, breaking away from the traditional rigid integrated force transmission method. In conjunction with the gradual locking structure of the front threaded hole and the rear smooth hole, the impact force is distributed to multiple turns of thread. As wear progresses, the force gradually enters the smooth hole, the stress points gradually increase, the stress is evenly distributed, and the weak points of the rod are completely avoided, effectively preventing metal fatigue and achieving a performance that is not easy to break and becomes stronger with use.

[0034] The present invention will be further described below with reference to specific embodiments.

[0035] like Figure 1 As shown, a connecting mechanism for a vibrator in this embodiment includes an impact link 200 and a threaded connector 100. One end of the impact link 200 is provided with an external thread 210; the threaded connector 100 is provided with a locking hole 110 for connecting with the external thread 210.

[0036] refer to Figure 2 As shown, the locking hole 110 is a blind hole extending inward from the surface of the threaded connector 100, and the locking hole 110 includes a first connecting hole 111 and a second connecting hole 1112 that are distributed vertically and communicate with each other. The inner peripheral wall of the first connecting hole 111 is machined with an internal thread that mates with the external thread 210; while the second connecting hole 1112 is a smooth hole.

[0037] Furthermore, such as Figure 3 As shown, the inner diameter D2 of the second connecting hole 1112 is not less than the inner diameter D1 of the first connecting hole 111, but less than the major diameter D3 of the internal thread. The major diameter D3 of the internal thread refers to the diameter of the imaginary cylinder tangent to the root of the internal thread.

[0038] Meanwhile, it is worth mentioning that, in this embodiment, for ease of understanding, without considering the influence of the machining accuracy of the internal thread, the inner diameter D1 of the first connecting hole 111 can be approximately equivalent to the minor diameter of the internal thread, that is, the diameter of the imaginary cylinder tangent to the crest of the internal thread.

[0039] In this embodiment, a connecting mechanism for a vibrator optimizes the specific structure and related dimensional parameters of the locking hole 110. This allows the external thread 210 on the impact connecting rod 200 to gradually extend axially after continuous impact wear. This enables multiple turns of the external thread 210 to sequentially engage with the first connecting hole 111 and form an interference fit with the inner wall of the smooth hole. This achieves a continuous transition from a threaded locking fit to an interference locking fit, further improving the service life of the vibrator.

[0040] Simultaneously, as the depth of the impact linkage 200 increases, more threads participate in the interference fit, the force-bearing area continuously increases, the locking friction torque increases synchronously, and the interference locking strength also gradually strengthens. Because the force in the threaded locking structure is not evenly distributed across every thread, but is mainly concentrated in the first few threads, under the condition that the normal thread force-bearing area is relatively constant, as the wear process progresses, the number of threads effectively bearing the load continuously increases; the overall force-bearing area of ​​the entire impact linkage 200 continuously increases, and the impact load per unit area decreases accordingly. This allows for more effective buffering of impact loads, dispersion of local stress, and avoidance of wear failure due to single-point overload, maintaining a reliable locking and limiting effect even after long-term use.

[0041] In addition, since the impact link 200 can gradually advance into the second connecting hole 1112 during operation, rather than being rigidly locked, it can buffer the additional load generated by working vibration, greatly reduce the wear and extrusion damage of the external thread caused by repeated alternating impact, effectively slow down the thread fatigue wear rate, and thus significantly extend the overall service life of the external thread.

[0042] refer to Figure 3 As shown, in some embodiments, the difference between the major diameter D3 of the internal thread and the inner diameter D2 of the second connecting hole 1112 is greater than half of the internal thread profile height H. Here, the internal thread profile height H refers to the vertical height from the root to the crest of the internal thread.

[0043] The purpose of this design is to effectively ensure a certain radial drop between the major diameter of the internal thread and the inner diameter of the second connecting hole 1112, preventing the external thread 210 on the impact connecting rod 200 from prematurely slipping into the second connecting hole 1112 when only slight wear occurs. That is, only after the external thread 210 has worn to a certain extent can it smoothly engage into the second connecting hole 1112 to achieve a secondary interference fit, thereby ensuring the effective stroke and duration of the thread locking.

[0044] Furthermore, the inner diameter D2 of the second connecting hole 1112 is equal to the inner diameter D1 of the second connecting hole 1112. At this time, the locking hole 110 is a through hole as a whole.

[0045] Preferably, the threaded connector 100 has an overall spherical structure, the two connecting holes are coaxially arranged, and the axis passes through the sphere.

[0046] In this embodiment, the second connecting hole 1112 and the first connecting hole 111 are set with the same diameter, which can facilitate the locking hole 110 to be machined in one go; at the same time, it can naturally ensure the coaxiality of the two connecting holes, so as to prevent the impact connecting rod 200 from being misaligned during assembly, causing local stress concentration and accelerating the wear of the screw threads.

[0047] Furthermore, when the inner diameters of the second connecting hole 1112 and the first connecting hole 111 are equal, the difference between the major diameter D3 of the internal thread and the inner diameter of the second connecting hole 1112 reaches its limit. This limit difference, while ensuring that the external thread 210 on the impact connecting rod 200 can enter the second connecting hole 1112 before wear failure, can further extend the duration of the long thread locking stage.

[0048] In some embodiments, the axial dimension L1 of the first connecting hole 111 is not greater than the axial dimension L2 of the second connecting hole 1112.

[0049] Preferably, the axial dimension ratio between the second connecting hole 1112 and the first connecting hole 111 is 1.5-2.5. For example, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, etc. Specifically, in this embodiment, the ratio is 2:1.

[0050] In this embodiment, after the external thread 210 wears, the impact link 200 can be axially displaced towards the side of the second connecting hole 1112. The longer second connecting hole 1112 can provide sufficient clearance stroke to ensure that the impact link 200 can be smoothly inserted and form a stable interference lock, and will not cause problems such as jamming or ineffective locking due to insufficient axial space in the second connecting hole 1112.

[0051] In other embodiments, the external thread 210 extends all the way to the bottom of the impact link 200, and the axial dimension L3 of the external thread 210 is greater than the axial dimension L1 of the first connecting hole 111 and less than the total axial dimension of the locking hole 110.

[0052] In this embodiment, by controlling the axial dimensions of the external thread 210 and the axial dimensions of the first connecting hole 111 and the locking hole 110, the unworn external thread can continue to form a thread lock with the internal thread, while the worn external thread 210 can enter the second connecting hole 1112 to achieve interference locking. This achieves simultaneous action of thread locking and interference locking, resulting in double anti-loosening and significantly improved reliability.

[0053] like Figure 4 , Figure 5 As shown, in this embodiment, a connecting mechanism for a vibrator has a mating component 220 machined on the end of the impact link 200 away from the external thread 210 for connecting with an electric hammer or electric pick. The mating component 220 can be a slot, flat section, spline, limit stage, etc., any equivalent structure that can achieve connection with a power tool chuck; no specific limitation is made here.

[0054] It is easy to understand that the interference fit between the connecting mechanism for the vibrator in this embodiment and the inner wall of the second connecting hole 1112 is essentially the external thread on the impact connecting rod 200. Therefore, to further ensure the interference fit effect, the inner diameter D2 of the second connecting hole 1112 is between the major diameter D4 and the minor diameter D5 of the external thread 210.

[0055] In addition, this embodiment also provides a universal vibratory actuator, including a vibratory plate and a connecting mechanism. The vibratory plate has a mounting groove that corresponds to the connector of the connecting mechanism. The connecting mechanism is a vibratory actuator connecting mechanism as described in the above embodiment.

[0056] In this embodiment of the universal vibrator, after initial assembly, the impact link 200 forms a threaded locking structure with the first connecting hole 111, and the external thread is axially confined at the junction of the first connecting hole 111 and the second connecting hole 1112. As vibration continues, after the external thread 210 wears down, it can be inserted into the second connecting hole 1112 and form an interference fit with the inner wall of the second connecting hole 1112.

[0057] Traditional impact linkages rely solely on hard contact at the front end of the rod to bear force, with the threads only serving a fixing and limiting function. Impact rebound is concentrated at a single point at the front, making the threads highly susceptible to damage. Furthermore, prolonged single-point stress leads to stress concentration and metal fatigue, resulting in breakage over time. In this embodiment, the front end is modified into a hollow, open-hole structure, distributing the force evenly across multiple turns of the threads. With wear and tear, the linkage gradually sinks into the open hole, with deeper penetration resulting in more threads participating in the force distribution. This leads to more uniform force distribution and thorough stress dispersion, eliminating metal fatigue and achieving a more secure and durable fit over time.

[0058] In summary, in this embodiment, even after the external thread is worn, a secondary interference lock can still be achieved between the worn thread and the through hole; and as the wear process progresses, the effect on the impact linkage 200 becomes better, thus achieving a technological breakthrough of becoming stronger with use. At the same time, it effectively overcomes the technical bias of traditional technologies where replacement is required once the thread fails due to wear.

[0059] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A threaded connector, wherein the threaded connector (100) has a locking hole (110) extending from its surface inward; characterized in that: The locking hole (110) includes a first connecting hole (111) and a second connecting hole (1112) that are interconnected; wherein, The inner circumferential wall of the first connecting hole (111) is machined with internal threads, and the second connecting hole (1112) is a smooth hole; the inner diameter D2 of the second connecting hole (1112) is not less than the inner diameter D1 of the first connecting hole (111), and the inner diameter D2 of the second connecting hole (1112) is less than the major diameter D3 of the internal thread. The internal thread of the first connecting hole (111) and the inner wall of the second connecting hole (1112) are successively engaged with the external thread assembled into the locking hole (110) for thread locking and interference locking.

2. A threaded connector according to claim 1, characterized in that: The difference between the major diameter D3 of the internal thread and the inner diameter D2 of the second connecting hole (1112) is greater than half of the thread profile height H.

3. A threaded connector according to claim 2, characterized in that: The inner diameter D1 of the first connecting hole (111) is equal to the inner diameter D2 of the second connecting hole (1112).

4. A threaded connector according to any one of claims 1-3, characterized in that: The axial dimension L1 of the first connecting hole (111) is not greater than the axial dimension L2 of the second connecting hole (1112).

5. A threaded connector according to claim 4, characterized in that: The axial dimension ratio of the second connecting hole (1112) to the first connecting hole (111) is 1.5-2.

5.

6. A connecting mechanism for a vibrator, comprising an impact link (200) and a connector; wherein, One end of the impact connecting rod (200) is provided with an external thread (210); characterized in that: the connector is a threaded connector as described in any one of claims 1-5; After assembly, the impact link (200) forms a threaded locking structure with the first connecting hole (111); after the external thread (210) wears, it can be inserted into the second connecting hole (1112) and form an interference locking structure with the inner wall of the second connecting hole (1112).

7. A connecting mechanism for a vibrator according to claim 6, characterized in that: The inner diameter D2 of the second connecting hole (1112) is between the major diameter D4 and minor diameter D5 of the external thread (210).

8. A connecting mechanism for a vibrator according to claim 7, characterized in that: The external thread (210) extends to the bottom of the impact connecting rod (200). The axial dimension L3 of the external thread (210) is greater than the axial dimension L1 of the first connecting hole (111) and less than the axial dimension of the locking hole (110).

9. A connecting mechanism for a vibrator according to any one of claims 6-8, characterized in that: The impact link (200) has a mating part (220) machined at one end away from the external thread (210) for connecting with an electric hammer or electric pick. The threaded connector (100) is an integral spherical structure.

10. A universal vibratory actuator, comprising a vibratory plate and a connecting mechanism, wherein the vibratory plate is machined with a mounting groove corresponding to the connector of the connecting mechanism, characterized in that, The connecting mechanism is a vibratory compactor connecting mechanism as described in any one of claims 6-9; or, The connector described herein is a threaded connector as described in any one of claims 1-5.

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