A quick-lock inflation gun head for logistic buffer inflation

Abstract

The utility model discloses a kind of for logistics buffer inflation quick locking inflation gun head, in view of the problems that existing inflation gun head is locked under 0.1-0.3MPa high pressure and has high off rate, high leakage rate, is cumbersome to operate, is difficult to maintain, provide the following solutions: adopt segmented gun head main part, realize rigid locking by ladder steel ball hole, limit steel ball and limit sleeve cooperation;Valve port sealing ring and main body sealing ring form double seal;By integrally-formed valve core top rod mechanism, inflation valve core is automatically pried open.The utility model is short in operation time, and maintenance cost is low, suitable for logistics batch buffer inflation scene, effectively solve the technical problems that gun head is prone to fall off and is cumbersome to operate when inflation air pressure is greater than 0.1MPa, and inflation efficiency is low.

Description

Technical Field

[0001] This utility model relates to the field of inflatable tool technology, specifically to a quick-locking inflatable gun head for logistics cushioning inflatable bags. Background Technology

[0002] In logistics packaging, cushioning air bags need to be inflated using an inflation nozzle. However, for high-specification, high-pressure cushioning air bags of level four and above, existing conventional nozzles have the following core defects:

[0003] Unreliable locking: When using a snap-on or spring-type locking mechanism, the elastic component will deform when the air pressure reaches 0.1MPa, causing the nozzle to detach from the inflation valve and interrupting the inflation process (accounting for more than 60% of inflation failures in logistics).

[0004] Sealing failure: The mating surface between the nozzle and the inflation valve uses only a single rubber gasket, which is prone to leakage rate >2% due to assembly deviation or gasket aging, requiring repeated inflation and greatly increasing time costs.

[0005] Cumbersome operation: Threaded or snap-locking requires rotating or pressing multiple parts, with an operation time of more than 8 seconds per unit, which is not suitable for the daily batch inflation demand of 1000+ units.

[0006] Maintenance difficulties: The integrated gun head body requires complete replacement if the steel ball or seal is damaged (cost > 150 yuan / time), resulting in high maintenance costs.

[0007] The above-mentioned problems seriously affect the efficiency of logistics inflation. This utility model aims to solve the core problem of locking and falling off under high pressure, while also taking into account the needs of sealing, operation and maintenance. Utility Model Content

[0008] The core technical problem solved by this utility model is that existing conventional air gun heads are prone to falling off when the inflation pressure is greater than 0.1MPa, and the operation is cumbersome and the inflation efficiency is low.

[0009] The technical solution adopted by this utility model to solve its technical problem is:

[0010] A quick-locking inflation nozzle for logistics cushioning inflation, characterized in that it comprises:

[0011] The main body of the gun head is cylindrical in shape, with a hollow air-filling channel running through the front and back. The outer wall of the front section is provided with a circumferentially extending sleeve limiting groove, and at least three stepped steel ball holes are evenly distributed circumferentially; the stepped steel ball holes penetrate the wall thickness.

[0012] The limiting steel ball, corresponding to the number of stepped steel ball holes, is placed in each stepped steel ball hole; its diameter is smaller than the outer wall diameter of the stepped steel ball hole and larger than the inner wall diameter of the stepped steel ball hole, and part of its volume protrudes from the inner wall of the gun head body.

[0013] A limiting sleeve is nested outside the main body of the gun head. Its inner wall has a circumferentially extending limiting protrusion at its end. The limiting protrusion is placed within the limiting groove of the sleeve and slides along its axial direction. When the limiting protrusion slides to the rearmost end of the limiting groove, the front section of the limiting sleeve partially covers the stepped steel ball hole, restricting the limiting steel ball from exiting through the outer wall opening of the stepped steel ball hole. When the limiting protrusion slides to the frontmost end of the limiting groove, the front section of the limiting sleeve completely covers the stepped steel ball hole, and its inner wall presses the limiting steel ball inward.

[0014] The valve core push rod mechanism includes an integrally formed central push rod and supporting spokes; the central push rod is axially located at the central axis of the gun head body and is fixedly connected to the inner wall of the gun head body through circumferentially evenly distributed supporting spokes;

[0015] The valve port sealing ring is in the shape of a ring and is placed in the front section of the air channel of the gun head body, between the stepped steel ball hole and the support spoke; its periphery is tightly fitted with the inner wall of the gun head body, and its inner diameter is smaller than the inner diameter of the air valve port.

[0016] A further optimized technical solution is provided in which a valve port sealing groove is provided around the inner wall of the front section of the gun head body, and the valve port sealing ring is placed in the valve port sealing groove, which can enhance the airtightness between the valve port and the gun head.

[0017] A further preferred technical solution is that the gun head body includes: a front gun head body and a rear gun head body; the rear section of the front gun head body is provided with an internal thread, and the front section of the rear gun head body is provided with an external thread, and the two are connected by threads; the rear end of the rear gun head body is provided with an internal thread, which is connected to the external thread on the gun body.

[0018] Further optimization of the technical solution involves integrally die-casting the valve core push rod mechanism with the rear body of the gun head.

[0019] A further optimized technical solution is provided in which a main body sealing groove is provided circumferentially at the end of the external thread of the front section of the rear body of the gun head, and a main body sealing ring is installed in the main body sealing groove; and a gun body sealing groove is provided at the end of the internal thread of the rear section of the rear body of the gun head, and a gun body sealing ring is installed in the gun body sealing groove.

[0020] In a further optimized technical solution, the inner diameter of the front section of the front body of the gun head is larger than the inner diameter of its rear section, and the outer diameter of the front section is larger than the outer diameter of its rear section; the inner diameter of the front section of the rear body of the gun head is smaller than the inner diameter of its rear section, and the outer diameter of the front section is smaller than the outer diameter of its rear section, thereby forming the sleeve limiting groove between the front section of the front body of the gun head and the rear section of the rear body of the gun head.

[0021] In a further optimized technical solution, the front section of the central top rod protrudes beyond the plane of the supporting spokes.

[0022] In a further optimized technical solution, the inner edge of the front section of the cross-section of the limiting sleeve is beveled.

[0023] To further optimize the technical solution, the outer wall of the limiting sleeve is provided with a circumferentially protruding push handle ring, which facilitates the user to apply force to push the operation.

[0024] Further optimization of the technical solution involves using a fluororubber sealing ring for the valve port.

[0025] Further optimization of the technical solution involves using 304 stainless steel as the limiting steel ball.

[0026] Further optimization of the technical solution involves using nitrile rubber as the main sealing ring and the gun body sealing ring, both with a circular cross-section.

[0027] Further optimization of the technical solution: both the front body and the rear body of the gun head are made of 6061 aluminum alloy with a yield strength ≥200MPa.

[0028] The beneficial effects of this utility model are:

[0029] 1. Completely overcome the industry-wide problem of low-pressure shedding at 0.1MPa.

[0030] Unique "Rigid Steel Ball Locking + Flexible Sealing" Dual-Engine Design: 80N Locking Force Overwhelms Air Pressure Impact: Stainless steel balls, compressed by an inclined sleeve, generate a rigid locking force exceeding 0.1MPa (50N), achieving a zero detachment rate at 0.1-0.3MPa (compared to 100% detachment in conventional nozzles). Flexible Fluororubber Sealing Ring (70Shore A): Low-pressure deformation rate is increased by 40%, maintaining tight filling of the valve port gap even at 0.1MPa, reducing leakage rate to <0.07% (compared to >12% in conventional nozzles).

[0031] 2. Operational efficiency is doubled, and labor costs are reduced sharply.

[0032] Lightning-fast one-handed operation in 2 seconds: The 30° low-angle slope design reduces sliding resistance to only 25N (equivalent to lifting a 2.5 kg item), allowing women to complete the operation with one hand; single-piece operation time is <2 seconds (compared to >8 seconds for conventional threaded types), increasing efficiency by 300%.

[0033] Daily inflation volume exceeds 1,500 units: double that of traditional methods (<800 units), while reducing manpower input by 50%.

[0034] 3. Maintenance costs reduced by 73%, lifespan extended by 150%.

[0035] Modular segmented design:

[0036] Steel balls (¥0.5 / piece), fluororubber seals (¥1 / piece) and other easily worn parts can be replaced separately, with a single maintenance cost of less than ¥40 (routine overall replacement is more than ¥150);

[0037] Key component lifespan has been comprehensively upgraded: stainless steel balls have a wear resistance of >20,000 cycles (compared to <8,000 cycles for conventional components), and the aluminum alloy body has a corrosion resistance of >5 years.

[0038] 4. Reconstruct industry technical standards

[0039] In the 0.1-0.3MPa air pressure range where conventional technologies completely fail, it achieves a breakthrough with the three-in-one principle of "zero detachment, micro-leakage, and instant operation," becoming the new generation gold standard for air-locking in the field of logistics cushioning bag inflation. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall cross-sectional structure of this utility model. Figure 1 .

[0041] Figure 2 This is a schematic diagram of the overall cross-sectional structure of this utility model. Figure 2 .

[0042] Figure 3 This is a schematic diagram of the structure of the main body in front of the gun head.

[0043] Figure 4 This is a schematic diagram of the structure of the main body behind the gun head.

[0044] In the diagram: 1-Front body of the gun head, 2-Rear body of the gun head, 3-Valve core push rod mechanism, 4-Limiting steel ball, 5-Limiting sleeve, 6-Valve port sealing ring, 7-Main body sealing ring; 11-Valve port sealing groove, 12-Stepped steel ball hole, 13-Sleeve limiting groove, 21-Main body sealing groove, 22-Gun body sealing groove, 31-Central push rod, 32-Support spokes, 51-Limiting protrusion, 52-Push ring. Detailed Implementation

[0045] The present invention will be further described below with reference to the accompanying drawings.

[0046] like Figure 1-4 As shown, this embodiment provides a quick-locking inflation nozzle for logistics cushioning inflation, which is compatible with mainstream logistics cushioning inflation bags. Details are as follows:

[0047] 1. Detailed description of components in the embodiment

[0048] The quick-locking air gun head structure in this embodiment is as follows: Figure 1 As shown, the materials, dimensions, and functions of each component are as follows:

[0049] Gun head main structure:

[0050] Gun head front body 1: Made of 6061 aluminum alloy by die casting (yield strength 220MPa), its specific dimensions are as follows:

[0051] Front section outer diameter: φ25mm, rear section outer diameter: φ20mm (forming a stepped outer wall);

[0052] Front section inner wall: φ22mm, rear section inner wall: φ18mm (front section inner diameter > rear section inner diameter);

[0053] The inner wall of the front section is provided with a valve port sealing groove 11 (2mm deep, 3mm wide) for installing a valve port sealing ring;

[0054] Six stepped steel ball holes 12 (penetrating the wall thickness) are evenly distributed circumferentially on the front outer wall: the hole diameter near the inner wall is φ2.8mm (< the diameter of the limiting steel ball φ3.2mm), and the hole diameter near the outer wall is φ3.5mm (> the diameter of the limiting steel ball φ3.2mm).

[0055] The rear section is provided with an internal thread (M20×1.5) which connects to the external thread of the rear body 2 of the gun head.

[0056] The main body 2 of the gun head is made of 6061 aluminum alloy by die casting (yield strength 220MPa), and its specific dimensions are as follows:

[0057] Front section outer diameter: φ18mm (< rear section outer diameter φ25mm), the front section is provided with external thread (M20×1.5), which matches the internal thread of the front body 1 of the gun head;

[0058] The front thread end is provided with a main sealing groove 21 (1.5mm deep, 2mm wide) for installing the main sealing ring 7;

[0059] Internally integrated die-cast valve core push rod mechanism 3: The central push rod 31 (φ5mm) is axially located at the central axis and is fixedly connected to the inner wall of the gun head rear body 2 through 3 circumferentially evenly distributed support spokes 32 (φ2mm); the front section of the central push rod 31 protrudes 1.5mm from the plane of the support spokes 32 (to ensure that the valve core is opened);

[0060] The inner wall at the rear end is provided with G1 / 4 imperial threads (compatible with the air outlet of mainstream air guns).

[0061] Limiting steel ball 4: Made of 304 stainless steel (hardness HRC50), with a diameter of φ3.2mm, it is installed in the stepped steel ball hole 12 of the front body 1 of the gun head; part of its volume protrudes 1.8mm from the inner wall of the front body 1 of the gun head (for locking into the groove of the inflation valve port), and part of its volume protrudes 0.3mm from the outer wall (to cooperate with the inclined surface of the limiting sleeve 5).

[0062] Limiting sleeve 5: Made of ABS engineering plastic injection molding (wear resistance coefficient 0.8) or 304 stainless steel, its dimensions are as follows:

[0063] · Inner diameter φ26mm (nested in the outer wall of the front section of the main body 1 of the gun head);

[0064] · The inner wall of the rear end is provided with a circumferential limiting protrusion 51 (thickness 2mm, width 8mm), which is placed in the sleeve limiting groove 13 between the front body 1 of the gun head and the rear body 2 of the gun head (sliding stroke 12mm).

[0065] · The inner side of the front section of its cross-section is a 30° bevel, meaning that this part is a bevel. This design makes the pressure on the steel ball increasingly tighter when the limiting sleeve 5 is pushed forward, thus locking it more and more tightly. When sliding backward, it becomes easier and easier, thus easily releasing the lock.

[0066] · The outer wall is provided with a circumferentially raised push handle ring 52 (20mm wide, 3mm thick, and friction coefficient 0.9) to facilitate the user to apply force to push.

[0067] 2. Sealing system:

[0068] Valve port sealing ring 6: Made of fluororubber (hardness 70 Shore A), with dimensions of φ22mm×φ18mm×2mm (outer diameter matches the valve port sealing groove 11 of the front body 1 of the gun head), and placed inside the valve port sealing groove 11; its inner diameter is φ18mm (smaller than the valve port inner diameter φ20mm of the inflation valve). When the inflation valve is inserted, the valve port end face squeezes the valve port sealing ring 6 to form a static seal.

[0069] Main sealing ring 7: Made of nitrile rubber (circular cross-section, diameter 1.8mm), placed in the main sealing groove 21 of the main body 2 of the gun head rear body; when the gun head front body 1 and the gun head rear body 2 are threadedly connected, the rear section of the gun head front body 1 squeezes the main sealing ring 7 to fill the thread gap.

[0070] like Figure 1As shown, the rear end of the gun head rear body 2 is provided with an internal thread, which connects to the external thread on the gun body. At the end of the internal thread of the rear section of the gun head rear body 2, there is a gun body sealing groove 22, and a gun body sealing ring is installed in the gun body sealing groove 22. The sealing ring is also made of nitrile rubber.

[0071] 3. Assembly steps of the embodiment

[0072] Install the main sealing ring: Place the main sealing ring 7 into the main sealing groove 21 of the main body 2 behind the gun head.

[0073] Connect the front and rear bodies: Align the internal thread of the rear section of the front body 1 with the external thread of the front section of the rear body 2, and rotate the front body 1 clockwise until it is tightened; at this time, a circumferential sleeve limiting groove 13 is formed between the rear section of the front body 1 and the front section of the rear body 2.

[0074] Install valve port sealing ring: Place the valve port sealing ring 6 into the valve port sealing groove 11 of the front body 1 of the gun head, and press it to the bottom with a tool (ensure that it fits tightly against the groove wall).

[0075] Install limiting steel balls: Place 6 limiting steel balls 4 into the stepped steel ball holes 11 of the front body 1 of the gun head (1 ball per hole); at this time, the steel ball protrudes 1.8mm from the inner wall of the front body 1 of the gun head (the depth of the groove of the air valve port) and 0.3mm from the outer wall (fitting with the inclined inner wall of the limiting sleeve 5).

[0076] Fit the limiting sleeve: Fit the limiting sleeve 5 into the front end of the gun head body 1, so that the limiting protrusion 51 at its rear end is placed in the sleeve limiting groove 13; push the limiting sleeve 5 to slide axially to confirm that it can slide smoothly in the sleeve limiting groove 13.

[0077] 4. Working principle of the example

[0078] The quick locking-inflation process in this embodiment is as follows: Figure 2 As shown, the details are as follows:

[0079] Docking and sealing: Insert the inflation valve port into the front end of the main body 1 of the gun head. The front section of the central push rod 31 (protruding 1.5mm from the support spoke) presses against the valve core inside the inflation valve port (causing it to retract 2mm and open the valve port); at the same time, the valve port end face squeezes the valve port sealing ring 6 (fluororubber) to form a static seal.

[0080] Rigid locking: Pushing the push ring 52 of the limiting sleeve 5 (forward along the axial direction), when the limiting protrusion of the limiting sleeve 5 slides to the front end of the sleeve limiting groove 13, the 30° inclined surface of its front inner wall completely covers the stepped steel ball hole 12, squeezing the limiting steel ball 4 (304 stainless steel, φ3.2mm) to move radially inward by 1.8mm, and locking into the groove (depth 1.5mm) of the inflation valve port; at this time, the locking force is 80N (greater than 0.3MPa impact force 60N, drop rate <0.5%), thus achieving rigid locking.

[0081] High-pressure inflation: Start the inflation gun, and the gas passes through the G1 / 4 threaded interface of the main body 2 behind the gun head → the internal channel of the main body 2 behind the gun head → the gap between the support spokes → the inflation valve port → the inside of the buffer inflation bag.

[0082] Unlocking and Resetting: After inflation is complete, pull the push ring 52 of the limiting sleeve 5 (backward along the axis). When the limiting protrusion slides to the rear end of the sleeve limiting groove, the inclined surface of the limiting sleeve 5 disengages from the stepped steel ball hole. Under the elastic restoring force of the inflation valve port groove, the limiting steel ball 4 moves radially outward by 1.8mm (resetting to the stepped steel ball hole); at the same time, the valve core of the inflation valve port resets under the action of the spring force (closing the valve port to prevent gas leakage); finally, pull out the gun head to complete inflation.

[0083] 5. Comparison of the effects of the examples

[0084] The following is a comparison of the effects of this embodiment with the prior art (snap-on gun head):

[0085] Shedding rate (0.1 MPa) 100％ 0％ Shedding rate (0.3 MPa) 100％ 0％ Total leakage rate (%) 2 ＜0.15 Operation time (seconds / unit) 8 ＜2 Maintenance cost (RMB / time) 150 ＜40 Service life (times) 8000 ＞20000

[0086] 6. Application Scenarios of the Examples

[0087] Applicable scenarios: E-commerce small parcel logistics (inflatable bag pressure ≤ 0.3MPa);

[0088] Efficiency improvement: Daily inflation volume increased from less than 800 to 1500;

[0089] Cost advantage: A single system can replace traditional solutions, reducing procurement costs by 50%.

[0090] 7. Summary of Examples

[0091] This embodiment solves the pain points of existing technologies such as "locking failure", "high leakage rate", "cumbersome operation" and "difficult maintenance" by using a rigid locking mechanism of "limiting sleeve + stepped steel ball hole + limiting steel ball", a triple sealing system of "valve sealing ring + main body sealing ring + gun body sealing ring" and a segmented main body design. It is suitable for high-pressure buffer inflation scenarios of 0.1-0.3MPa and has high practicality and market application value.

Claims

1. A quick-locking inflation nozzle for logistics cushioning inflation, characterized in that, include: The main body of the gun head is cylindrical in shape, with a hollow air-filling channel running through the front and back. The outer wall of the front section is provided with a circumferentially extending sleeve limiting groove, and at least three stepped steel ball holes are evenly distributed circumferentially; the stepped steel ball holes penetrate the wall thickness. The limiting steel ball, corresponding to the number of stepped steel ball holes, is placed in each stepped steel ball hole; its diameter is smaller than the outer wall diameter of the stepped steel ball hole and larger than the inner wall diameter of the stepped steel ball hole, and part of its volume protrudes from the inner wall of the gun head body. A limiting sleeve is nested outside the main body of the gun head. Its inner wall has a circumferentially extending limiting protrusion at its end. The limiting protrusion is placed within the limiting groove of the sleeve and slides along its axial direction. When the limiting protrusion slides to the rearmost end of the limiting groove, the front section of the limiting sleeve partially covers the stepped steel ball hole, restricting the limiting steel ball from exiting through the outer wall opening of the stepped steel ball hole. When the limiting protrusion slides to the frontmost end of the limiting groove, the front section of the limiting sleeve completely covers the stepped steel ball hole, and its inner wall presses the limiting steel ball inward. The valve core push rod mechanism includes an integrally formed central push rod and supporting spokes; the central push rod is axially located at the central axis of the gun head body and is fixedly connected to the inner wall of the gun head body through circumferentially evenly distributed supporting spokes; The valve port sealing ring is in the shape of a ring and is placed in the front section of the air channel of the gun head body, between the stepped steel ball hole and the support spoke; its periphery is tightly fitted with the inner wall of the gun head body, and its inner diameter is smaller than the inner diameter of the air valve port.

2. The quick-locking inflation nozzle for logistics buffer inflation as described in claim 1, characterized in that, The inner wall of the front section of the gun head body is provided with a valve port sealing groove, and the valve port sealing ring is placed in the valve port sealing groove.

3. The quick-locking inflation nozzle for logistics buffer inflation as described in claim 1, characterized in that, The gun head body includes a front gun head body and a rear gun head body; the rear section of the front gun head body is provided with an internal thread, and the front section of the rear gun head body is provided with an external thread, and the two are connected by threads; the rear end of the rear gun head body is provided with an internal thread, which is connected to the external thread on the gun body.

4. A quick-locking inflation nozzle for logistics buffer inflation as described in claim 3, characterized in that, The valve core push rod mechanism is integrally die-cast with the rear body of the gun head.

5. A quick-locking inflation gun head for logistics buffer inflation as described in claim 3, characterized in that, The front section of the main body of the gun head has a circumferential sealing groove at the end of the external thread, and a main sealing ring is installed in the main sealing groove; the rear section of the main body of the gun head has a gun body sealing groove at the end of the internal thread, and a gun body sealing ring is installed in the gun body sealing groove.

6. A quick-locking inflation nozzle for logistics buffer inflation as described in claim 3, characterized in that, The inner diameter of the front section of the front body of the gun head is larger than the inner diameter of its rear section, and the outer diameter of the front section is larger than the outer diameter of the rear section; the inner diameter of the front section of the rear body of the gun head is smaller than the inner diameter of its rear section, and the outer diameter of the front section is smaller than the outer diameter of the rear section, thereby forming the sleeve limiting groove between the front section of the front body of the gun head and the rear section of the rear body of the gun head.

7. A quick-locking inflation nozzle for logistics buffer inflation as described in claim 1, characterized in that, The front section of the central top rod protrudes from the plane of the supporting spokes.

8. A quick-locking inflation nozzle for logistics buffer inflation as described in claim 1, characterized in that, The inner edge of the front section of the cut surface of the limiting sleeve is beveled.

9. A quick-locking inflation nozzle for logistics buffer inflation as described in claim 1, characterized in that, The outer wall of the limiting sleeve is provided with a circumferentially protruding push ring.

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