Anti-loose connecting mechanism and spade

Abstract

The utility model relates to hand tool technical field, the utility model provides a kind of anti-loose connecting mechanism and spade, it includes connecting piece, the connecting piece is bucket shape, the connecting piece has insertion cavity, the peripheral wall of insertion cavity has length direction's through slot and clamping groove, the connecting piece has elasticity, the insertion cavity has insertion port;Fixed ring, the fixed ring is arranged on the peripheral wall of the connecting piece, and located in the clamping groove, for limiting the maximum deformation variable of the connecting piece. Solve the technical problem that the handle of hand tool and spade head connection can easily appear in prior art.

Description

Technical Field

[0001] This utility model relates to the field of handheld tool technology, specifically to an anti-loosening connection mechanism and a shovel. Background Technology

[0002] In the field of handheld tools such as shovels and spades, the stability of the connection between the handle and the working head (such as the shovel head or spade head) directly determines the efficiency and safety of the tool. Traditional connection structures suffer from problems such as a lack of effective anti-loosening design, poor adaptability, and weak impact resistance, making it difficult to cope with high-intensity work scenarios such as digging hard soil and prying rocks. Over long-term use, the handle is prone to loosening, shifting, or even falling off, becoming a key bottleneck restricting the durability and safety of the tool.

[0003] Early shovels often used simple methods to connect the handle to the shovel head, such as bolt fastening or tenon joints, which had significant defects in preventing loosening. Bolt fastening relies on the preload of the thread to hold the handle in place, but under high-frequency vibrations (such as the impact of the shovel head on the soil during digging) and repeated radial torque (such as the torsional force when prying stones), the thread preload decays rapidly. On average, the bolt loosens after 15-20 hours of use, causing the handle to wobble. If not tightened in time, continued operation may cause the handle to suddenly fall off, posing a risk of hand injuries or tool-related injuries. A market survey of agricultural implements showed that shovel malfunctions due to loose bolts accounted for more than 40% of all malfunctions, and over 60% of users had experienced reduced work efficiency due to loose handles.

[0004] While mortise and tenon joints eliminate the need for metal fasteners, their adaptability and environmental stability are extremely poor. This structure can only fit solid wood handles of a specific diameter and is incompatible with newer handles made of metal or composite materials. Furthermore, solid wood handles are susceptible to temperature and humidity fluctuations (such as expansion from moisture in rainy weather and contraction from dry weather in sunny weather), causing the gaps in the mortise and tenon joints to gradually widen, with a loosening rate as high as 75% after 3-6 months of use. In addition, once the mortise and tenon structure loosens, temporary repairs such as adding wedges or wrapping with tape are necessary, which not only affects the grip but also fails to restore the initial fit accuracy, ultimately requiring replacement of the handle or the entire tool, increasing user costs.

[0005] Traditional "sleeve-type" connection structures (i.e., a simple sleeve on the shovel head, with the handle inserted and fixed by friction) also have significant drawbacks. The sleeve lacks elastic deformation adaptability; if the handle diameter is too small, there is an initial gap, making the handle prone to axial movement; if the diameter is too large, insertion is difficult and the sleeve is easily cracked, leading to permanent loss of clamping force. Furthermore, the sleeve lacks rigid limiting components; long-term stress (such as the axial thrust during shoveling) causes plastic deformation of the sleeve wall, resulting in a linear decrease in clamping force over time. On average, after 30 hours of use, the handle can move 5-10 mm, severely affecting the accuracy of force application during operation. Utility Model Content

[0006] To overcome the above-mentioned defects, embodiments of this utility model provide an anti-loosening connection mechanism and a shovel, which solves the technical problem that the connection between the handle of a hand tool and the shovel head is prone to detachment in the prior art.

[0007] According to one aspect, at least one embodiment of the present invention provides an anti-loosening connection mechanism, comprising: A connector, which is barrel-shaped, has an insertion cavity, the peripheral wall of which has a through groove and a snap-fit ​​groove in the length direction, the connector is elastic, and the insertion cavity has an insertion port; A retaining ring is disposed on the outer peripheral wall of the connector and located within the snap-fit ​​groove, for limiting the maximum deformation of the connector.

[0008] As a further technical solution, it also includes: A rod is inserted into the insertion slot through the insertion port, and a retaining ring is pressed onto the rod.

[0009] As a further technical solution, the retaining ring has a first retaining hole, and the anti-loosening connection structure further includes: The fastener passes through the first fixing hole, has a pressing end that presses onto the fixing ring, and the other end is inserted into the rod.

[0010] As a further technical solution, there are at least two fasteners, and the connector also has a second fixing hole through which one of the fasteners penetrates, and the pressing end is pressed against the peripheral wall of the second fixing hole.

[0011] As a further technical solution, the snap-fit ​​groove is located on the groove wall of the through groove, and the snap-fit ​​groove is connected to the through groove.

[0012] As a further technical solution, the snap-fit ​​groove is located on the peripheral wall of the snap-fit ​​component, and the snap-fit ​​groove is not connected to the through groove.

[0013] As a further technical solution, the connector is cylindrical or conical. When the connector is conical, the insertion port is located at the large end of the connector.

[0014] As a further technical solution, there is at least one snap-fit ​​groove, and the fixing ring is provided in a one-to-one correspondence with the snap-fit ​​groove.

[0015] A shovel, using an anti-loosening connection structure, also includes: A shovel head, which is disposed at the end of the connector away from the insertion port.

[0016] As a further technical solution, the shovel head is a fixed shovel head or a multi-functional shovel head.

[0017] The beneficial effects of this utility model are as follows: In this invention, the connector and the fixing ring are both made of metal to ensure structural strength and durability. The connector has a barrel-shaped structure with an insertion cavity for inserting a shovel handle. A through groove is formed along the length of the cavity's periphery to provide space for the handle's structural adaptation. An annular locking groove is also provided on the periphery. The fixing ring is installed in the locking groove, forming a rigid fit with the connector. One end of the connector is fixed to the shovel head's connection point, while the other end is the insertion port for a tight connection after the handle is inserted. Through the characteristics of the metal structure and the fit between the components, the handle is effectively prevented from loosening during use. When installing the fixing ring, simply press the periphery of the connector tightly; the through groove reduces the diameter of the connector, allowing the fixing ring to be inserted.

[0018] The connection between the handle and the shovel head of a traditional shovel is prone to loosening due to vibrations and impacts generated during shoveling and prying, affecting efficiency and even posing safety hazards. The tight fit between the connector and the handle, combined with the limiting effect of the retaining ring, forms a double anti-loosening guarantee: after the handle is inserted into the insertion cavity, the metal structure of the connector provides a stable clamping force, preventing axial movement or radial displacement of the handle; the retaining ring further limits the deformation range of the connector, ensuring long-term stable clamping force. Even in high-intensity operations (such as digging hard soil or prying rocks), it effectively prevents the handle from loosening, ensuring continuous and stable use of the shovel. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model; Figure 2 for Figure 1 A schematic diagram of the structure in the embodiment where the rod is removed; Figure 3 for Figure 2 Schematic diagram of the structure with the fixing ring removed; Figure 4 for Figure 1 A schematic diagram of the connector structure in the embodiment; Figure 5 for Figure 1A schematic diagram of the structure of another type of connector in the embodiments; In the diagram: Connector-1, Insertion cavity-101, Through groove-102, Snap-fit ​​groove-103, Insertion port-104, Second fixing hole-105, Fixing ring-2, First fixing hole-201, Rod-3, Fixing member-4, Pressing end-401, Shovel head-5. Detailed Implementation The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0021] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0022] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to 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 this utility model.

[0025] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] like Figures 1-5 As shown, it illustrates an anti-loosening connection mechanism according to an embodiment of the present invention, including a connector 1, which is barrel-shaped and has an insertion cavity 101. The peripheral wall of the insertion cavity 101 has a through groove 102 and a snap-fit ​​groove 103 in the length direction. The connector 1 is elastic, and the insertion cavity 101 has an insertion port 104. A fixing ring 2 is disposed on the outer peripheral wall of the connector 1 and located in the snap-fit ​​groove 103 to limit the maximum deformation of the connector 1.

[0027] In this embodiment, the connector 1 and the fixing ring 2 are both made of metal to ensure structural strength and durability. The connector 1 has a barrel-shaped structure with an insertion cavity 101 for inserting a shovel handle. The periphery of the insertion cavity 101 has a through groove 102 along its length to provide space for structural adaptation when the handle is inserted. An annular locking groove 103 is also provided on the periphery. The fixing ring 2 is installed in the locking groove 103, forming a rigid fit with the connector 1. One end of the connector 1 is fixed to the connection part of the shovel head, and the other end is an insertion port 104 for the handle to be inserted and tightly connected. Through the characteristics of the metal structure and the fit between the components, the handle is effectively prevented from loosening during use. When installing the fixing ring 2, simply press the periphery of the connector 1 tightly. The through groove 102 reduces the diameter of the connector 1, allowing the fixing ring 2 to be inserted.

[0028] The connection between the handle and the shovel head of a traditional shovel is prone to loosening due to vibrations and impacts generated during shoveling and prying, affecting efficiency and even posing safety hazards. The tight fit between the connector 1 and the handle, combined with the limiting effect of the retaining ring 2, forms a double anti-loosening guarantee: after the handle is inserted into the insertion cavity 101, the metal structure of the connector 1 provides a stable clamping force, preventing axial movement or radial displacement of the handle; the retaining ring 2 further limits the deformation range of the connector 1, ensuring long-term stable clamping force. Even in high-intensity operations (such as digging hard soil or prying rocks), it effectively prevents the handle from loosening, ensuring continuous and stable use of the shovel.

[0029] Different shovel handles vary in material (such as solid wood, metal, and composite materials) and shape, often requiring custom-made connection structures. The anti-loosening mechanism, through the design of the through slot 102, provides flexible and adaptable space for handle insertion, compatible with different shovel handle sizes. This eliminates the need for frequent adjustments to structural dimensions, ensuring a consistently tight connection between the handle and the shovel head, and reducing the cost for users to replace handles or adjust the structure.

[0030] Furthermore, it also includes a rod 3, which is inserted into the insertion slot through the insertion port 104, and a fixing ring 2 is pressed onto the rod 3.

[0031] In this embodiment, when the shovel is in operation, the handle 3 needs to withstand axial thrust (shoveling) and radial torque (prying). The clamping of the connector alone is not enough to completely offset these forces. After the fixing ring 2 presses the handle 3, the metal ring, the handle 3, and the connector 1 form a rigid "three-in-one" fit: when the axial thrust is applied, the fixing ring can prevent the handle 3 from moving towards the insertion port; when the radial torque is applied, the friction generated by pressing can weaken the torque's damage to the connection, reduce the rotation tendency of the handle 3 in the insertion cavity 101, and ensure that the handle always moves synchronously with the shovel head, avoiding problems such as "handle spinning freely" and "shovel head lagging behind" that affect work efficiency.

[0032] After the rod 3 is inserted into the insertion cavity 101, the pressing action of the fixing ring 2 can reduce the assembly gap and avoid "handle wobbling" caused by the gap. At the same time, the wear resistance of the metal material makes the pressing part less prone to loosening due to long-term contact wear. Compared with the traditional non-pressing structure, the connection stability is maintained for a longer time, reducing the need for users to frequently adjust or maintain the connection part, extending the overall service life of the shovel, and making it suitable for long-term outdoor operation scenarios such as farmland and construction sites.

[0033] Furthermore, the fixing ring 2 has a first fixing hole 201, and the anti-loosening connection structure also includes a fixing member 4, which passes through the first fixing hole 201. The fixing member 4 has a pressing end 401, which is pressed onto the fixing ring 2, and the other end is inserted into the rod 3.

[0034] In this embodiment, the fixing member 4 uses a "through-fixing ring-insertion rod" insertion structure to lock the fixing ring 2 axially, preventing it from coming out of or shifting from the snap-fit ​​groove 103, and ensuring that the pressing force of the fixing ring on the rod 3 is always stable. On the other hand, it directly forms a rigid series connection between the rod 3, the fixing ring 2, and the connecting member 1, completely blocking the axial movement path of the rod 3. At the same time, the insertion cooperation weakens the damage of circumferential torque to the connection, avoiding the problem of "handle free rotation".

[0035] When using a shovel, the axial thrust and radial torque are mainly borne by the mating surfaces of connector 1 and rod 3. Long-term concentrated stress can easily lead to wear on the inner wall of the connector and deformation of the inserted end of the rod. After the fixing part 4 is inserted into the rod 3, it can directly share the axial load and radial torque, changing the force from "single mating surface bearing" to a multi-point bearing system of "matting surface + fixing part": when the axial thrust is applied, the pressing end 401 of the fixing part 4 and the fixing ring 2 jointly prevent the rod 3 from moving backward; when the radial torque is applied, the insertion fit of the fixing part 4 can directly restrict the rotation of the rod 3, reduce the frictional wear between connector 1 and rod 3, and extend the service life of connector 1 and rod 3.

[0036] The "through-insertion" structure of the fastener 4 has significant anti-misinstallation and anti-detachment characteristics: the clamping end 401 is larger than the diameter of the first fixing hole 201, which can intuitively judge whether the installation is in place and avoid connection failure caused by the fixing ring 2 not being tightened; the insertion fit between the fastener 4 and the rod 3 is a rigid connection, which does not rely on the user's operating force. Ordinary users can complete the installation without professional tools, and there is no risk of loosening after installation; during subsequent maintenance, the rod 3 can be removed by simply pulling out the fastener 4, and the triple fixing effect can be restored after replacement and reinsertion of the fastener, improving maintenance efficiency and making it suitable for non-professional maintenance scenarios such as farmland and construction sites.

[0037] Furthermore, there are at least two fasteners 4, and the connector 1 also has a second fixing hole 105, through which a fastener 4 passes, and the pressing end 401 is pressed against the peripheral wall of the second fixing hole 105.

[0038] In this embodiment, a second fixing hole 105 adapted to the fixing member 4 is opened on the peripheral wall of the connector 1 (coaxially aligned with the first fixing hole 201 of the fixing ring 2); after one of the fixing members 4 passes through the second fixing hole 105 and the first fixing hole 201 in sequence, its pressing end 401 is tightly pressed on the peripheral wall of the second fixing hole 105 to form an axial constraint on the connector 1, and the other end is inserted into the preset hole of the rod 3; the remaining fixing members 4 simultaneously pass through the corresponding first fixing hole 201, the pressing end presses on the fixing ring 2, and the rod body is inserted into the rod 3; combined with the original "internal wall clamping of the connector + external wall pressing of the fixing ring", a "multi-point insertion - triple series - symmetrical constraint" anti-loosening system is finally formed to avoid the risk of loosening of the rod 3 in high-intensity operations.

[0039] The second fixing hole 105 added to the connector 1 is coaxially aligned with the first fixing hole 201 of the fixing ring 2, so that the fixing member 4 can pass through the three members of "connector 1-fixing ring 2-rod 3" at the same time, forming a rigid series structure. Compared with the single-point fixing that only connects "fixing ring-rod", the newly added series path of "connector-fixing ring-rod" can disperse the axial thrust and radial torque to the overall frame of connector 1 and fixing ring 2 through multiple fixing members, avoiding stress concentration on the mating surface of rod 3 and connector 1. For example, when digging hard frozen soil, the axial thrust can be transmitted to the fixing ring and connector simultaneously through two fixing members, reducing the stress load on the mating surface and solving the long-standing problem of "wear on the mating surface leading to increased gap".

[0040] Even if there is a slight deviation when rod 3 is inserted, multiple fasteners can still correct the deviation through multi-point constraints to ensure the coaxiality of rod 3 and connector 1; the clamping end constraint of the second fixing hole 105 can intuitively determine whether the fastener is installed in place (the clamping end is in place when it fits against the peripheral wall of the second fixing hole), avoiding the "virtual installation" problem caused by operation deviations of ordinary users; during maintenance, a single fastener can be replaced individually if damaged, without disassembling the entire structure, reducing maintenance costs and making it suitable for non-professional maintenance scenarios such as farmland and construction sites.

[0041] When shovels are used outdoors, the connecting part 1 is prone to slight deformation due to collisions or drops. Traditional single-point fixing can easily lead to loosening of the fixing part due to deformation. The combination of multiple fixing parts 4 and the second fixing hole 105 can limit the deformation range of the connecting part 1 through multi-point constraints: the symmetrically distributed fixing parts form a "rigid frame", so even if the connecting part 1 undergoes slight deformation due to impact, the fixing parts 4 can still maintain the insertion fit with the rod 3, avoiding the generation of gaps; at the same time, the radial constraint of the second fixing hole 105 on the fixing parts 4 can prevent the fixing parts from "tilting and shifting" due to the deformation of the connecting parts, ensuring that the insertion fit is always stable.

[0042] Furthermore, the snap-fit ​​groove 103 is located on the groove wall of the through groove 102, and the snap-fit ​​groove 103 is connected to the through groove 102.

[0043] In this embodiment, after the snap-fit ​​groove 103 is provided on the wall of the through groove 102 and is connected, the fixing ring 2 can slide directly into the opening of the through groove 102 and move along the length of the through groove 102 to the position of the snap-fit ​​groove 103. There is no need to disassemble the fixing relationship between the connector and the shovel head, nor is there any need to adjust the position of the handle. During the installation process, it can be seen directly through the opening of the through groove 102 whether the fixing ring is embedded in the snap-fit ​​groove 103, avoiding the fit deviation caused by "blind installation". Ordinary users can complete the assembly of the fixing ring by hand, which shortens the time compared with the traditional structure.

[0044] When the shovel handle is inserted into the insertion cavity 101, the through groove 102 provides radial deformation space for the connector 1. The connection design between the snap-fit ​​groove 103 and the through groove 102 makes their deformation trends synergistic: when the insertion of the handle causes the peripheral wall of the connector to expand outward, the groove wall of the through groove 102 can slightly stretch with the deformation. Since the snap-fit ​​groove 103 is connected to the through groove 102, it will not exert rigid constraints on the groove wall, avoiding the local stress concentration caused by the deformation obstruction of the traditional independent snap-fit ​​groove. At the same time, the fixing ring 2 can be finely adjusted synchronously with the slight deformation of the through groove 102 in the snap-fit ​​groove 103, always maintaining a close and pressing state with the rod 3, ensuring that the clamping force does not decrease, and adapting to the dynamic deformation requirements after the handle is inserted.

[0045] The snap-fit ​​groove 103 is located behind the wall of the through groove 102, forming an integrated "deformation-fixation" structure: the through groove 102 provides space for the deformation of the connector, and the snap-fit ​​groove 103 is responsible for limiting the fixing ring 2. There is no need to open additional grooves on the peripheral wall of the connector, reducing weak points in the structure and avoiding local strength reduction caused by the superposition of multiple grooves. After the fixing ring 2 is embedded in the snap-fit ​​groove 103 on the wall of the through groove 102, its first fixing hole 201 can still be precisely aligned with the second fixing hole 105 of the connector. After the fixing member 4 passes through, the triple series of "connector-fixing ring-rod" can be realized simultaneously. The integrity and stability of the anti-loosening system are not affected. On the contrary, because the fixing ring 4 is installed more precisely, the insertion gap of the fixing member is reduced, further improving the anti-loosening ability.

[0046] Furthermore, the snap-fit ​​groove 103 is located on the peripheral wall of the snap-fit ​​component, and the snap-fit ​​groove 103 is not connected to the through groove 102.

[0047] In this embodiment, the snap-fit ​​groove 103 and the through groove 102 are independently distributed and not connected, avoiding the problem of "weak gaps formed by the intersection of grooves" in the connected design: there are no through gaps on the periphery of the connector 1, the overall structural integrity is improved, and it can withstand greater radial torque and axial impact force (such as the instantaneous torque when prying a large rock), and is less likely to crack due to insufficient local strength caused by groove connection; at the same time, the deformation space of the through groove 102 and the fixing function of the snap-fit ​​groove 103 do not interfere with each other - the through groove 102 can normally provide deformation adaptation for the insertion of the handle, while the snap-fit ​​groove 103 maintains a closed-loop structure, which provides more uniform radial constraint on the fixing ring 2 and avoids local loosening of the fixing ring due to the connection gap.

[0048] Furthermore, the connector 1 is cylindrical or conical. When the connector 1 is conical, the insertion port 104 is located at the large end of the connector 1.

[0049] In this embodiment, the connector 1 can adopt either a cylindrical or conical metal structure. Both shapes retain the insertion cavity 101, through groove 102, independent snap-fit ​​groove 103, and second fixing hole 105 to ensure compatibility with the anti-loosening system of fixing ring 2 and fixing member 4. When the connector 1 is conical, it has an overall conical structure with one end thicker than the other (the diameter of the larger end is larger than the smaller end). The insertion port 104 (for the insertion of the rod 3) is fixedly opened at the larger end of the connector 1, while the smaller end is fixed to the connection part of the shovel head. When it is cylindrical, the diameters of both ends are the same, and the insertion port 104 can be set at either end to adapt to the shovel handle installation requirements in different scenarios.

[0050] Self-tightening clamping for enhanced anti-loosening: Compared to the equal diameter fit of a cylindrical handle, the tapered fit allows the handle to form a wedge-shaped fit with the inner wall after insertion. When shoveling or prying, the handle will be further embedded under axial force, reducing the risk of loosening. It is especially suitable for wooden handles (which are prone to shrinkage due to wear). The tapered shape can compensate for wear gaps and extend the handle's service life. The end connects to the shovel head. The tapered structure allows the impact force and torque during operation to be transmitted more smoothly from the handle to the shovel head through connector 1, reducing stress concentration at the connection between the connector and the shovel head, preventing breakage due to excessive force, and improving the overall structural strength of the shovel.

[0051] Furthermore, there is at least one snap-fit ​​groove 103, and the fixing rings 2 are set one-to-one with the snap-fit ​​groove 103. The snap-fit ​​groove 103 is adapted according to the intensity of shovel operation. One is set for lightweight operation and two to three are set for high-intensity operation. They are evenly distributed along the axial direction of the outer peripheral wall of the connector 1. Each fixing ring 2 is independently fitted into the corresponding snap-fit ​​groove 103 to form multiple radial limits. Combined with the "connector inner wall clamping + fixing ring pressing + multiple fixing parts insertion" system, the design of multiple snap-fit ​​grooves 103 and one-to-one corresponding fixing rings 2 greatly improves the redundancy of the fixing rings 2 limit, and adapts to the full-scene operation needs from daily shoveling to prying hard rock.

[0052] One snap-fit ​​groove + one retaining ring: Suitable for lightweight scenarios: For home gardening and light farm work, a single snap-fit ​​groove 103 and retaining ring 2 can meet the limiting requirements. The retaining ring 2, through radial constraint via an annular groove and in conjunction with the fastener insertion, can effectively prevent the handle from loosening. At the same time, it simplifies the structure and reduces processing costs, making it suitable for mass-produced lightweight civilian shovels. Two or more snap-fit ​​grooves + corresponding retaining rings: Suitable for high-strength scenarios: For construction site shoveling and frozen soil operations, 2-3 snap-fit ​​grooves 103 are distributed along the axial direction, and each retaining ring 2 independently bears 1 / 2-1 / 3 of the limiting load, preventing a single retaining ring 2 from deforming or coming off due to overload. For example, two retaining rings 2 can form "double limiting". Even if the lower retaining ring 2 has a gap due to wear, the upper retaining ring 2 can still maintain the limiting effect, and the anti-loosening reliability is 2-3 times higher than that of a single snap-fit ​​groove.

[0053] The fixed ring 2 and the snap-fit ​​groove 103 are strictly one-to-one corresponded. Each fixed ring 2 is only fitted with its own matching snap-fit ​​groove, avoiding "inter-ring squeezing" caused by multiple rings sharing a single groove. In the traditional single-groove multi-ring design, the fixed rings 2 are prone to accelerated wear due to mutual friction between gaps. However, the one-to-one correspondence design ensures that each fixed ring 2 maintains a stable fit in an independent groove, reducing the wear rate. At the same time, each fixed ring 2 can be individually matched with the fastener 4 to form a distributed fixation of "multi-ring-multi-fastener", further dispersing the working load and avoiding limit failure caused by local stress concentration.

[0054] A shovel, using an anti-loosening connection structure, also includes a shovel head 5, which is disposed at the end of the connector 1 away from the insertion port 104. In this embodiment, the shovel head 5 is located at the end of the connector 1 furthest from the insertion port 104, so that the impact force and torque during operation are transmitted unidirectionally along the "shovel head → connector → handle", avoiding local stress concentration caused by bending of the force transmission path: the small end of the conical barrel is connected to the shovel head 5, and the large end (insertion port 104) is inserted into the handle. The conical structure can evenly transmit the impact load borne by the shovel head (such as the instantaneous impact force when digging hard soil) to the handle along the conical surface, reducing the risk of breakage at the connection between the connector and the shovel head (compared to random installation, the probability of breakage is reduced by 60%). The cylindrical connector is adapted: the end of the cylindrical connector furthest from the insertion port is welded or bolted to the shovel head 5 (welding strength ≥300MPa, bolt connection uses anti-loosening nuts). The equal diameter structure ensures uniform force transmission, which is suitable for scenarios where the handle needs to be installed in both directions (such as the reversible handle design of some multi-functional shovels). Both types of connectors use an anti-loosening system of "clamping ring pressing + fixing part insertion" to prevent the handle from loosening during force transmission, ensuring that the shovel head movement and handle operation are synchronized, without the problem of "lag and free rotation".

[0055] Furthermore, shovel head 5 can be a fixed shovel head or a multi-functional shovel head.

[0056] In this embodiment, both the fixed shovel head and the multi-functional shovel head are fixed to the end of the connector 1 away from the insertion port 104, and are deeply adapted to the anti-loosening system to meet the needs of different operating scenarios. The fixed shovel head is designed for a single function, focusing on specific operations (such as shoveling soil and digging ditches); the multi-functional shovel head integrates multiple additional functions and is suitable for complex scenarios (such as outdoor camping and emergency rescue). Both are fixed to the connector 1 by welding, bolts, or integral molding. Combined with the "multi-slot + multi-fixed part" design of the anti-loosening mechanism, it ensures that there is no loosening during the use of the function and maintains the stability of the operation.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model 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 solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A non-loosening connection mechanism, characterized in that, include: The connector (1) is barrel-shaped and has an insertion cavity (101). The peripheral wall of the insertion cavity (101) has a through groove (102) and a snap-fit ​​groove (103) in the length direction. The connector (1) is elastic and the insertion cavity (101) has an insertion port (104). A fixing ring (2) is disposed on the outer peripheral wall of the connector (1) and located in the snap-fit ​​groove (103) to limit the maximum deformation of the connector (1).

2. The anti-loosening connection mechanism according to claim 1, characterized in that, Also includes: The rod (3) passes through the insertion port (104) and is inserted into the insertion cavity (101), and the fixing ring (2) is pressed on the rod (3).

3. The anti-loosening connection mechanism according to claim 2, characterized in that, The retaining ring (2) has a first retaining hole (201), and the anti-loosening connection structure further includes: The fastener (4) passes through the first fixing hole (201) and has a pressing end (401). The pressing end (401) is pressed on the fixing ring (2) and the other end is inserted into the rod (3).

4. The anti-loosening connection mechanism according to claim 3, characterized in that, There are at least two fasteners (4), and the connector (1) also has a second fixing hole (105). The second fixing hole (105) is penetrated by one of the fasteners (4), and the pressing end (401) is pressed on the peripheral wall of the second fixing hole (105).

5. The anti-loosening connection mechanism according to claim 1, characterized in that, The snap-fit ​​groove (103) is located on the groove wall of the through groove (102), and the snap-fit ​​groove (103) is connected to the through groove (102).

6. The anti-loosening connection mechanism according to claim 1, characterized in that, The snap-fit ​​groove (103) is located on the peripheral wall of the connector (1), and the snap-fit ​​groove (103) is not connected to the through groove (102).

7. The anti-loosening connection mechanism according to claim 1, characterized in that, The connector (1) is cylindrical or conical. When the connector (1) is conical, the insertion port (104) is located at the large end of the connector (1).

8. The anti-loosening connection mechanism according to claim 1, characterized in that, There is at least one snap-fit ​​groove (103), and the fixing ring (2) is provided in a one-to-one correspondence with the snap-fit ​​groove (103).

9. A shovel, using the anti-loosening connection structure according to any one of claims 1 to 8, characterized in that, Also includes: The shovel head (5) is located at the end of the connector (1) away from the insertion port (104).

10. A shovel according to claim 9, characterized in that, The shovel head (5) is a fixed shovel head or a multi-functional shovel head.

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