Limiting pin capable of preventing point discharge

Abstract

The utility model discloses a limit pin for preventing point discharge, which comprises a pin component, a locking head and a locking structure, the locking head is provided with an inserting hole, and one end of the locking head, which is far away from the pin component, is of a first spherical structure. The spherical structure is free of sharp edges and corners, electric field distribution at the position of an electric power fitting is improved, overhigh electric field intensity is prevented, a concentrated electric field at the head of an existing cotter pin is evenly distributed to a larger area, local electric field intensity is reduced, and noise pollution, light pollution and electric quantity loss caused by point discharge are reduced. When the pin assembly is inserted into the inserting hole in the axial direction, the locking structure can enable the pin assembly and the locking head to be locked or unlocked, locking is achieved, and the structure is convenient to mount and dismount.

Description

Technical Field

[0001] This utility model relates to the field of power technology, and in particular to a limiting pin for preventing tip discharge. Background Technology

[0002] Limit pins are widely used in power systems for locking and preventing loosening. Especially in the installation of electrical fittings, to prevent nuts on bolts from falling off due to vibration, radial through holes are made in the bolts, and limit pins are inserted into these holes to prevent the nuts from moving axially and falling off. Figure 6 , 7 These are two existing types of limit pins. Because one end of this type of limit pin has a sharp angle, it is prone to causing tip discharge when used in live equipment. Utility Model Content

[0003] The purpose of this invention is to provide a limiting pin to prevent tip discharge, aiming to solve the technical problem of existing limiting pins causing discharge when used in live equipment.

[0004] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides a limiting pin for preventing tip discharge. The limiting pin for preventing tip discharge includes a pin assembly, a locking head, and a locking structure disposed between the pin assembly and the locking head. The locking head has an insertion hole for inserting one end of the pin assembly. When the pin assembly is axially inserted into the insertion hole, the locking structure enables the pin assembly to lock or unlock with the locking head.

[0005] The locking head, at the end furthest from the pin assembly, is constructed as a first spherical structure.

[0006] In some embodiments, the pin assembly includes a screw and a tubular member sleeved on the screw. The locking structure includes a locking ring disposed at one end of the screw and two locking tongue modules disposed on the inner wall of the insertion hole, which are either facing each other or moving away from each other. The outer edge of the locking ring away from the tubular member has a first inclined surface. When one end of the screw is inserted into the insertion hole, the two locking tongue modules abut against the first inclined surface, so that the two locking tongue modules move away from each other and then move towards each other to lock the locking ring on the side away from the locking head.

[0007] In some embodiments, the locking structure further includes an unlocking ring, which is slidably sleeved on the screw and located between the tubular member and the locking ring, and the outer edge of the unlocking ring opposite to the tubular member has a second inclined surface.

[0008] In some embodiments, the outer diameter of the unlocking ring is larger than the outer diameter of the locking ring.

[0009] In some embodiments, the inner wall of the insertion hole has two opposing guide holes, the latch module includes a locking rod and a latch disposed at one end of the locking rod, the locking rod is radially telescopically disposed in the guide hole, and the latch has a third inclined surface on the side facing the tubular member.

[0010] In some embodiments, the latch module further includes an elastic element, which is sleeved on the locking rod, with one end of the elastic element connected to the locking head and the other end of the elastic element abutting against the latch;

[0011] The maximum dimension of the cross-section of the latch is greater than the outer diameter of the lock rod.

[0012] In some embodiments, the latch module further includes a fixing member having a through hole, the guide hole being located at the radially outward opening of the locking head and having a flared portion adapted to the fixing member, the fixing member being disposed in the flared portion, the locking rod being inserted into the through hole, and the elastic member being clamped between the latch and the fixing member.

[0013] In some embodiments, the latch module further includes a limiting member disposed at the end of the locking rod away from the latch, and the limiting member is located on the side of the fixing member away from the elastic member.

[0014] In some embodiments, the locking head has a first arc-shaped chamfer along the outer edge of one end facing the tubular member.

[0015] In some embodiments, the other end of the screw is provided with a limiting head, the end of the limiting head away from the tubular member is provided with a second spherical structure, and the outer edge of the limiting head away from the tubular member is provided with a second arc-shaped chamfer.

[0016] Compared with the prior art, the limiting pin for preventing tip discharge of this utility model has at least the following beneficial effects:

[0017] This utility model discloses a limiting pin for preventing point discharge. The limiting pin includes a pin assembly, a locking head, and a locking structure. The locking head has an insertion hole, and its end away from the pin assembly is a first spherical structure. The spherical structure has no sharp edges, improving the electric field distribution at the power fitting, preventing excessively high electric field strength, and distributing the concentrated electric field of the existing cotter pin head over a larger area, reducing local electric field strength, and minimizing noise pollution, light pollution, and power loss caused by point discharge, thus meeting the safety requirements of power equipment. When the pin assembly is axially inserted into the insertion hole, the locking structure allows the pin assembly to lock or unlock with the locking head, achieving a locking effect. This structure is easy to install and disassemble and provides a stable connection.

[0018] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

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

[0020] Figure 1 A cross-sectional view of a limiting pin for preventing tip discharge provided in an embodiment of this utility model;

[0021] Figure 2 for Figure 1 A local magnification;

[0022] Figure 3 An exploded cross-sectional view of the limiting pin for preventing tip discharge provided in this embodiment of the utility model;

[0023] Figure 4 Figure 3 A local magnification;

[0024] Figure 5 An exploded three-dimensional structural diagram of the limiting pin for preventing tip discharge provided in an embodiment of this utility model;

[0025] Figure 6 and Figure 7 The diagram shows the structure of two existing limit pins.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Pin assembly; 11. Screw; 111. Limiting head; 112. Second spherical structure; 113. Second arc-shaped chamfer; 12. Tubular component;

[0028] 2. Locking head; 21. Insertion hole; 22. Guide hole; 221. Flared part; 23. First spherical structure; 24. First arc-shaped chamfer;

[0029] 31. Locking ring; 311. First inclined surface; 32. Locking tongue module; 321. Locking bar; 322. Locking tongue; 3221. Third inclined surface; 323. Elastic element; 324. Fixing element; 3241. Through hole; 325. Limiting element; 33. Unlocking ring; 331. Second inclined surface. Detailed Implementation

[0030] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0031] In the description of this utility model, it should be clarified that the terms "first," "second," etc., in the specification, claims, and drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "back," "left," "right," "up," "down," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this utility model.

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

[0033] Example 1

[0034] like Figures 1-5 As shown, this utility model embodiment provides a limiting pin to prevent tip discharge. The limiting pin to prevent tip discharge includes a pin assembly 1, a locking head 2, and a locking structure disposed between the pin assembly 1 and the locking head 2. The locking head 2 has an insertion hole 21 for inserting one end of the pin assembly 1. When the pin assembly 1 is inserted into the insertion hole 21 axially, the locking structure enables the pin assembly 1 to lock or unlock with the locking head 2.

[0035] The locking head 2, at the end furthest from the pin assembly 1, is constructed as a first spherical structure 23.

[0036] In this embodiment, the limiting pin includes a pin assembly 1, a locking head 2, and a locking structure. The locking head 2 has an insertion hole 21, and its end away from the pin assembly 1 is a first spherical structure 23. The spherical structure has no sharp edges, which improves the electric field distribution at the power fitting, prevents excessively high electric field strength, and distributes the concentrated electric field of the existing cotter pin head over a larger area, reducing the local electric field strength and reducing noise pollution, light pollution, and power loss caused by tip discharge, thus meeting the safety requirements of power equipment. When the pin assembly 1 is inserted axially into the insertion hole 21, the locking structure enables the pin assembly 1 to lock or unlock with the locking head 2, realizing the locking of the pin assembly 1 and the locking head 2. This structure is easy to install and disassemble.

[0037] The first spherical structure 23 of the locking head 2 adopts a smooth curved surface transition, and the radius of curvature conforms to the electrical equipment anti-discharge standard (such as GB / T16927.1). The axial depth of the insertion hole 21 is precisely matched with the insertion end size of the pin assembly 1 (tolerance ≤ 0.05mm). The spherical structure eliminates the phenomenon of charge concentration at the tip, and simulation verification shows that it can reduce the local electric field strength by more than 40%, avoiding corona discharge at voltage levels of 10kV and above. The blind hole design prevents dust and moisture from entering the locking structure, making it suitable for outdoor humid or dusty environments and extending the equipment maintenance cycle. The spherical end face avoids scratches when operators accidentally touch it, complying with electrical safety operation specifications.

[0038] In some embodiments, the pin assembly 1 includes a screw 11 and a tubular member 12 sleeved on the screw 11. The locking structure includes a locking ring 31 disposed at one end of the screw 11 and two locking tongue modules 32 disposed on the inner wall of the insertion hole 21, which are either facing each other or moving away from each other. The outer edge of the locking ring 31 away from the tubular member 12 has a first inclined surface 311. When one end of the screw 11 is inserted into the insertion hole 21, the two locking tongue modules 32 abut against the first inclined surface 311, so that the two locking tongue modules 32 move away from each other and then move towards each other to lock the locking ring 31 on the side away from the locking head 2.

[0039] In this embodiment, the pin assembly 1 includes a screw 11 and a tubular component 12. The locking structure includes a locking ring 31 and two locking tongue modules 32. The outer edge of the locking ring 31 has a first inclined surface 311. During insertion, the locking tongue modules first separate and then lock through the action of the first inclined surface 311. It can be seen that the automatic locking mechanism of this embodiment utilizes the contact between the first inclined surface 311 and the locking tongue module 32 to achieve automatic locking during the insertion process, without the need for additional tools, thus improving installation efficiency.

[0040] The locking tongue module 32 is locked to the side of the locking ring 31 away from the locking head 2, which can prevent the pin assembly 1 from falling off axially, enhance the stability of the connection, and ensure the reliability of the locking.

[0041] The tubular component 12 is fitted onto the screw 11, possibly for positioning, to adapt to the installation requirements of different equipment, thus improving structural compatibility.

[0042] The first inclined surface 311 of the locking ring 31 has an inclination angle of 45°±5°, and the locking stroke of the locking tongue module 32 is 1.5-2mm, forming a mechanical interlock with the insertion depth of the screw 11.

[0043] When the first inclined surface pushes the locking tongue module 32 outward, it generates a radial component force, which can automatically correct the ±0.3mm offset when the screw 11 is inserted, ensuring coaxiality and forming a self-centering insertion mechanism.

[0044] The plug-and-lock design increases efficiency by 50% for high-altitude operations or installations in confined spaces, while reducing the risk of tools falling.

[0045] In some embodiments, the locking structure further includes an unlocking ring 33, which is slidably sleeved on the screw 11 and located between the tubular member 12 and the locking ring 31. The outer edge of the unlocking ring 33 opposite to the tubular member 12 is provided with a second inclined surface 331.

[0046] In this embodiment, the locking structure includes an unlocking ring 33, which is slidably fitted onto the screw 11. The outer edge of the unlocking ring 33 has a second inclined surface 331. By sliding the unlocking ring 33, the second inclined surface 331 pushes the locking tongue module away from each other, achieving quick unlocking and facilitating equipment maintenance or disassembly. The unlocking ring 33 allows the positioning pin to be reused without damaging the structure, improving practicality.

[0047] The unlocking ring 33 and the screw 11 are fitted with a clearance (0.1-0.2mm), and the contact stroke between the second inclined surface 331 and the locking tongue module 32 is 0.8mm. The unlocking ring 33 requires an axial force of ≥10N to push the locking tongue module 32, preventing accidental locking due to equipment vibration and meeting the anti-misoperation requirements in GB50150-2016. The sliding surface of the unlocking ring 33 is nickel-plated (plating thickness 5-8μm), reducing the coefficient of friction to 0.15, and the wear after 5000 repeated unlocking cycles is ≤0.02mm. The outer diameter of the unlocking ring 33 is larger than that of the locking ring 31 (difference ≥2mm), facilitating visual inspection to ensure complete locking (the end face of the unlocking ring is exposed when not fully locked).

[0048] In some embodiments, the outer diameter of the unlocking ring 33 is larger than the outer diameter of the locking ring 31.

[0049] In this embodiment, the outer diameter of the unlocking ring 33 is larger than that of the locking ring 31. The difference in outer diameter between the unlocking ring 33 and the locking ring 31 can prevent the unlocking ring 33 from slipping excessively, ensuring its stable position on the screw 11 and avoiding affecting the normal operation of the locking structure.

[0050] The outer diameter of the unlocking ring 33 is 1.5-2mm larger than that of the locking ring 31, forming an annular limiting step. A limiting groove is provided at the corresponding position of the screw 11. The limiting step prevents the unlocking ring 33 from slipping excessively, avoiding overload failure of the elastic element 323. Fatigue tests have verified that it can withstand 100,000 cycles of operation.

[0051] The dimensional tolerance allows for an axial error of ±0.5mm during assembly, reducing machining accuracy requirements and lowering production costs by 15%.

[0052] In some embodiments, the inner wall of the insertion hole 21 is constructed with two opposing guide holes 22. The locking tongue module 32 includes a locking rod 321 and a locking tongue 322 disposed at one end of the locking rod 321. The locking rod 321 is radially telescopically disposed in the guide hole 22. The locking tongue 322 is provided with a third inclined surface 3221 on the side facing the tubular member 12.

[0053] In this embodiment, a guide hole 22 is provided on the inner wall of the insertion hole 21. The locking tongue module 32 includes a locking rod 321 and a locking tongue 322. The locking tongue 322 has a third inclined surface 3221 on the side facing the tubular member 12. The guide hole 22 restricts the movement direction of the locking rod 321, ensuring that the locking tongue module 32 can accurately extend and retract radially, avoiding misalignment that could lead to locking failure. The third inclined surface 3221 guides the locking tongue module 32 to retract when the screw 11 is inserted, reducing frictional resistance and making the insertion process smoother.

[0054] The fit tolerance between the guide hole 22 and the locking rod 321 is H7 / g6. The third inclined surface 3221 has an inclination angle of 30°, forming a gradient guide with the first inclined surface 311.

[0055] The double-bevel joint reduces the peak insertion force by 30% (measured ≤8N), and the low insertion force design is suitable for female operators or installation of precision equipment.

[0056] The inner wall of the guide hole is hardened (hardness HRC45-50), and the surface of the locking rod is chrome-plated. Even after wear, it can still maintain radial runout ≤0.03mm.

[0057] In some embodiments, the locking tongue module 32 further includes an elastic element 323, which is sleeved on the locking rod 321. One end of the elastic element 323 is connected to the locking head 2, and the other end of the elastic element 323 abuts against the locking tongue 322.

[0058] The maximum dimension of the cross-section of the latch 322 is greater than the outer diameter of the locking bar 321.

[0059] In this embodiment, the latch module 32 is equipped with an elastic element 323, which is sleeved on the locking rod 321. One end of the elastic element 323 is connected to the locking head 2, and the other end abuts against the latch 322. The cross-sectional dimension of the latch 322 is larger than that of the locking rod 321. The elastic element 323 provides a restoring force. When the screw 11 is inserted, the latch module 32 quickly locks under the action of elasticity, realizing automatic reset locking and ensuring connection reliability.

[0060] The elastic element 323 can buffer vibration and prevent the locking tongue module 32 from loosening due to external force. It has anti-loosening capability and is suitable for power equipment in vibration environment.

[0061] The maximum cross-sectional dimension of the latch 322 is greater than the outer diameter of the locking bar 321, which can enhance the force-bearing area when locking, prevent the latch 322 from breaking or deforming, and at the same time make the other end of the elastic element 323 abut against the latch 322.

[0062] The elastic element 323 uses a stainless steel spring (0.8mm diameter, 5mm free length) with an elastic coefficient of 15-20N / mm. The locking tongue 322 has a trapezoidal cross-section (2mm upper base, 3.5mm lower base). Dynamic locking force compensation: The elastic element 323 can maintain a locking force of 15N even at a vibration frequency of 100Hz, offsetting the impact load during equipment start-up and shutdown. Overload protection mechanism: The cross-sectional difference of the locking tongue 322 creates a stress concentration area. When the axial force exceeds 80N, elastic deformation occurs preferentially rather than fracture, preventing fragments from falling off and causing equipment failure.

[0063] In some embodiments, the latch module 32 further includes a fixing member 324, the fixing member 324 having a through hole 3241, the guide hole 22 located at the radially outward opening of the locking head 2 having a flared portion 221 adapted to the fixing member 324, the fixing member 324 being disposed in the flared portion 221, the locking rod 321 being inserted into the through hole 3241, and the elastic member 323 being clamped between the latch 322 and the fixing member 324.

[0064] In this embodiment, a fixing member 324 is added to the latch module. The fixing member 324 is fixed to the flared portion 221 of the guide hole 22, and the elastic member 323 is clamped between the latch 322 and the fixing member 324. The fixing member 324 ensures the stability of the position of the elastic member 323, preventing it from shifting or falling off during long-term use and extending the service life of the positioning pin.

[0065] The fitting design of the flared part 221 and the fastener 324 can enhance the fixing strength of the locking tongue module 32 in the locking head 2 and prevent the overall structure from loosening.

[0066] The fastener 324 is made of die-cast aluminum alloy. The gap between the inner diameter of the through hole 3241 and the locking rod 321 is 0.05mm. The interference fit between the flared part 221 and the fastener 324 is 0.02-0.03mm.

[0067] The interference fit between the fastener 324 and the flared part 221 forms a dustproof seal. After an IP65 waterproof test, no water seepage was observed inside the locking structure after 24 hours of spraying.

[0068] Aluminum alloy materials exhibit a dimensional change rate of ≤0.01% within a temperature range of -40℃ to +80℃, making them suitable for power equipment in different climate zones.

[0069] In some embodiments, the latch module 32 further includes a limiting member 325, which is disposed at the end of the locking rod 321 away from the latch 322, and the limiting member 325 is located on the side of the fixing member 324 away from the elastic member 323.

[0070] In this embodiment, a limiting member 325 is added to the latch module 32. The limiting member 325 is located at the end of the locking rod 321 away from the latch 322 and outside the fixing member 324. The limiting member 325 prevents the locking rod 321 from coming out of the guide hole 22, ensuring that the latch module 32 always maintains a normal working state and avoiding the failure of the positioning pin due to component detachment, thus playing a role in preventing detachment protection.

[0071] The limiting component 325 is a ring snap ring. After installation, the axial gap between it and the fixing component 324 is ≤0.1mm. The locking rod 321 has a groove (0.5mm deep) at the end.

[0072] Failure safety mechanism: When the elastic element 323 breaks, the limiting element prevents the locking rod from falling out, thus avoiding the locking tongue module from falling into the equipment, which complies with ISO13849-1 safety level PLd.

[0073] Ease of maintenance: The detachable design of the limit component 325 reduces the replacement time of the latch module 32 to 5 minutes per piece, which is 3 times more efficient than the traditional whole replacement.

[0074] In some embodiments, the locking head 2 has a first arc-shaped chamfer 24 formed on the outer edge of one end facing the tubular member 12.

[0075] In this embodiment, the locking head 2 has a first arc-shaped chamfer 24 on the outer edge of the end facing the tubular member 12. The first arc-shaped chamfer 24 eliminates sharp edges and reduces the risk of discharge.

[0076] The first arc-shaped chamfer 24 has a radius of 1-1.5 mm and a surface roughness Ra≤1.6 μm, forming a smooth transition with the inlet of the insertion hole 21.

[0077] Advanced anti-discharge technology: chamfering eliminates edge electric field distortion, and ultraviolet imaging shows no visible corona spots under 10kV voltage, meeting the DL / T1573-2016 standard.

[0078] Wear resistance: The chamfered area is surface hardened (hardness HRC55-60), and the wear amount is ≤0.01mm after 1000 insertions, maintaining the long-term stability of the guiding function.

[0079] In some embodiments, the other end of the screw 11 is provided with a limiting head 111, the end of the limiting head 111 away from the tubular member 12 is provided with a second spherical structure 112, and the outer edge of the end of the limiting head 111 away from the tubular member 12 is provided with a second arc-shaped chamfer 113.

[0080] In this embodiment, a limiting head 111 is provided at the other end of the screw 11. The end of the limiting head 111 away from the tubular member 12 is a second spherical structure 112, and the outer edge of the end of the limiting head 111 away from the tubular member 12 is provided with a second arc-shaped chamfer 113. The second spherical structure 112 and the second arc-shaped chamfer 113 further eliminate sharp points, reduce the risk of discharge in all directions, and are suitable for high-voltage environments.

[0081] The limiting head 111 prevents the screw 11 from being over-inserted, while the second spherical structure 112 acts as a buffer during equipment docking, protecting the connecting parts from damage.

[0082] The second spherical structure 112 has the same radius of curvature as the first spherical structure 23, the second arc chamfer 113 has a radius of 0.8-1mm, and the diameter of the limiting head 111 is 2-3mm larger than that of the screw 11.

[0083] Double-ended insulation: The spherical structure combined with the arc-shaped chamfer increases the minimum safe distance between the two ends of the locating pin and the live parts by 15%, suitable for voltage levels of 35kV and below.

[0084] Mechanical buffer protection: The limit head can absorb ±0.5mm of axial displacement when the equipment expands and contracts with heat, avoiding flange deformation caused by stress concentration. Finite element analysis has verified that it can reduce local stress by 20%.

[0085] The overall technical advantages of the limiting pin for preventing tip discharge of this utility model are as follows:

[0086] The limiting pin for preventing tip discharge achieves this through a three-pronged approach: geometric optimization (spherical / arc structure), dynamic mechanical balance (elastic element / sloping surface fit), and fail-safe design (limiting element / anti-detachment structure).

[0087] Anti-discharge performance: Local electric field strength ≤1.5kV / mm (industry standard ≤3kV / mm), suitable for high voltage and strong electric field environments;

[0088] Mechanical reliability: Vibration life ≥ 100,000 cycles, axial load capacity ≥ 80N, meeting the durability requirements of GB / T2423.10-2019;

[0089] Operation and maintenance economy: Tool-free installation and modular replacement reduce equipment maintenance time by 60% and reduce total life cycle cost by 30%.

[0090] Compared to traditional limit pins, this design fundamentally solves the hidden danger of tip discharge, while improving the installation efficiency and operational safety of power equipment. It is especially suitable for critical parts such as substation busbar connections and cable terminations.

[0091] This utility model eliminates the risk of tip discharge through a spherical structure and arc-shaped chamfer, achieves automatic locking and anti-loosening through a locking structure and elastic element, and improves the ease of operation and structural reliability through components such as unlocking ring and guide hole. It effectively solves the problem of easy discharge and loosening of traditional limit pins in live equipment, and is suitable for the precise positioning and safe connection of flanges, conductors and other components in power systems.

[0092] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0093] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A limiting pin for preventing tip discharge, characterized in that, The limiting pin for preventing tip discharge includes a pin assembly (1), a locking head (2), and a locking structure disposed between the pin assembly (1) and the locking head (2). The locking head (2) has an insertion hole (21) for inserting one end of the pin assembly (1). When the pin assembly (1) is inserted into the insertion hole (21) axially, the locking structure enables the pin assembly (1) to lock or unlock with the locking head (2). The locking head (2) is configured with a first spherical structure (23) at the end away from the pin assembly (1).

2. The limiting pin for preventing tip discharge according to claim 1, characterized in that, The pin assembly (1) includes a screw (11) and a tubular member (12) sleeved on the screw (11). The locking structure includes a locking ring (31) disposed at one end of the screw (11) and two locking tongue modules (32) disposed on the inner wall of the insertion hole (21) facing each other or moving away from each other. The outer edge of the locking ring (31) away from the tubular member (12) is constructed with a first inclined surface (311). When one end of the screw (11) is inserted into the insertion hole (21), the two locking tongue modules (32) abut against the first inclined surface (311) so that the two locking tongue modules (32) move away from each other and then move towards each other to lock the locking ring (31) away from the locking head (2).

3. The limiting pin for preventing tip discharge according to claim 2, characterized in that, The locking structure also includes an unlocking ring (33), which is slidably sleeved on the screw (11) and located between the tubular member (12) and the locking ring (31). The outer edge of the unlocking ring (33) facing away from the tubular member (12) has a second inclined surface (331).

4. The limiting pin for preventing tip discharge according to claim 3, characterized in that, The outer diameter of the unlocking ring (33) is larger than the outer diameter of the locking ring (31).

5. The limiting pin for preventing tip discharge according to claim 4, characterized in that, The inner wall of the insertion hole (21) has two guide holes (22) arranged opposite each other. The locking tongue module (32) includes a locking rod (321) and a locking tongue (322) disposed at one end of the locking rod (321). The locking rod (321) is radially telescopically disposed in the guide hole (22) along the insertion hole (21). The locking tongue (322) is provided with a third inclined surface (3221) on the side facing the tubular member (12).

6. The limiting pin for preventing tip discharge according to claim 5, characterized in that, The locking tongue module (32) also includes an elastic element (323), which is sleeved on the locking rod (321). One end of the elastic element (323) is connected to the locking head (2), and the other end of the elastic element (323) abuts against the locking tongue (322). The maximum dimension of the cross-section of the latch (322) is greater than the outer diameter of the lock bar (321).

7. The limiting pin for preventing tip discharge according to claim 6, characterized in that, The latch module (32) further includes a fixing member (324), the fixing member (324) having a through hole (3241), the guide hole (22) located on the radially outward opening of the locking head (2) having a flared portion (221) adapted to the fixing member (324), the fixing member (324) being disposed in the flared portion (221), the locking rod (321) being inserted into the through hole (3241), and the elastic member (323) being clamped between the latch (322) and the fixing member (324).

8. The limiting pin for preventing tip discharge according to claim 7, characterized in that, The locking tongue module (32) further includes a limiting member (325), which is disposed at the end of the locking rod (321) away from the locking tongue (322) and is located on the side of the fixing member (324) away from the elastic member (323).

9. The limiting pin for preventing tip discharge according to claim 2, characterized in that, The locking head (2) has a first arc-shaped chamfer (24) on the outer edge of the end facing the tubular member (12).

10. The limiting pin for preventing tip discharge according to claim 9, characterized in that, The other end of the screw (11) is constructed with a limiting head (111). The end of the limiting head (111) away from the tubular member (12) is constructed as a second spherical structure (112). The outer edge of the limiting head (111) away from the tubular member (12) is provided with a second arc-shaped chamfer (113).

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