Quick locking inflation gun head for logistics buffer inflation

Abstract

The invention discloses a quick-locking inflation gun head for logistics buffer inflation, and provides the following solution aiming at the problems that the existing inflation gun head is high in locking falling rate, high in leakage rate, tedious in operation and difficult to maintain under the high pressure of 0.1-0.3 MPa: a sectional gun head main body is adopted; rigid locking is realized through matching of the stepped steel ball hole, the limiting steel ball and the limiting sleeve; a valve port sealing ring and a main body sealing ring are arranged to form double sealing; and the valve core of the inflation valve is automatically opened through the integrally formed valve core ejector rod mechanism. The method is short in operation time, low in maintenance cost and suitable for logistics batch buffer inflation scenes, and the technical problems that when the inflation air pressure is larger than 0.1 MPa, the gun head is prone to falling off, operation is tedious, and the inflation efficiency is low are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of inflating tools, in particular to a quick locking inflating gun head for logistics buffer inflatable bags. BACKGROUND

[0002] In logistics packaging, buffer inflatable bags need to be inflated by an inflating gun head. However, for the inflation of high-specification and high-pressure buffer inflatable bags of four levels or above, the existing conventional gun head has the following core defects:

[0003] Unreliable locking: a buckle type or spring type locking mechanism is adopted, when the air pressure reaches 0.1 MPa, the elastic component will be deformed, thereby causing the gun head to fall off from the inflation valve port, and interrupting the inflation process (accounting for more than 60% of logistics inflation failures).

[0004] Sealing failure: the butt joint surface of the gun head and the inflation valve port only uses a single rubber gasket, which is prone to leakage due to assembly deviation or gasket aging, with a leakage rate of >2%, requiring repeated inflation, and greatly increasing the time cost.

[0005] Complicated operation: threaded or buckled locking requires rotating or pressing multiple components, with an operation time of >8 seconds per component, which is not suitable for batch inflation requirements of 1000+ per day.

[0006] Maintenance difficulty: the integrated gun head body needs to be replaced as a whole when the steel ball or sealing element is damaged (cost >150 yuan / time), which is high in maintenance cost.

[0007] The above problems seriously affect the logistics inflation efficiency, and the present application aims to solve the core problem of locking falling off under high pressure, while considering the sealing, operation and maintenance requirements. SUMMARY

[0008] The core technical problem solved by the present application is that the existing conventional inflating gun head is prone to gun head falling off and complicated operation when the inflation air pressure is greater than 0.1 MPa, and the inflation efficiency is low.

[0009] The technical solution adopted by the present application to solve the technical problem is:

[0010] A quick locking inflating gun head for logistics buffer inflation, characterized in that it comprises:

[0011] A gun head body, which is in the shape of a cylinder as a whole, has a hollow inflation channel inside, a sleeve limiting groove extending in the circumference is arranged on the outer wall of the front section, and at least three stepped steel ball holes are uniformly distributed in the circumference; the stepped steel ball hole penetrates the wall thickness;

[0012] A plurality of limit steel balls are respectively arranged in the plurality of stepped steel ball holes, and the diameter of each limit steel ball is smaller than the outer diameter of the stepped steel ball hole and larger than the inner diameter of the stepped steel ball hole, and part of the volume of each limit steel ball protrudes from the inner wall of the gun head body.

[0013] A limit sleeve is arranged outside the gun head body, and a limit protrusion is arranged at the end of the inner wall of the limit sleeve and extends in the circumferential direction. The limit protrusion is arranged in the sleeve limit groove and slides along the axial direction of the sleeve limit groove. When the limit protrusion slides to the last end of the sleeve limit groove, the front end of the limit sleeve covers part of the stepped steel ball hole, and the limit steel ball is prevented from being taken out of the stepped steel ball hole. When the limit protrusion slides to the front end of the sleeve limit groove, the front end of the limit sleeve completely covers the stepped steel ball hole, and the inner wall of the limit sleeve presses the limit steel ball inward.

[0014] A valve core top rod mechanism includes a center top rod and a support spoke. The center top rod is arranged at the center axis of the gun head body in the axial direction, and is fixedly connected to the inner wall of the gun head body through the support spoke which is uniformly distributed in the circumferential direction.

[0015] A valve port sealing ring is arranged in the front end of the inflation passage of the gun head body and between the stepped steel ball hole and the support spoke. The valve port sealing ring is in the form of a ring piece, and the periphery of the valve port sealing ring is tightly attached to the inner wall of the gun head body, and the inner diameter of the valve port sealing ring is smaller than the inner diameter of the valve port of the inflation valve.

[0016] In a further preferred technical solution, a valve port sealing groove is arranged in the circumferential direction of the front end of the inner wall of the gun head body, and the valve port sealing ring is arranged in the valve port sealing groove, so as to enhance the air tightness between the valve port and the gun head.

[0017] In a further preferred technical solution, the gun head body includes a gun head front body and a gun head rear body. The rear end of the gun head front body is provided with an internal thread, and the front end of the gun head rear body is provided with an external thread. The gun head front body and the gun head rear body are connected through the internal thread and the external thread. The rear end of the gun head rear body is provided with an internal thread, and the internal thread is connected to the external thread of the gun body.

[0018] In a further preferred technical solution, the valve core top rod mechanism and the gun head rear body are integrally formed by die casting.

[0019] In a further preferred technical solution, the end of the external thread of the front end of the gun head rear body is provided with a main body sealing groove in the circumferential direction, and a main body sealing ring is arranged in the main body sealing groove. The end of the internal thread of the rear end of the gun head rear body is provided with a gun body sealing groove, and a gun body sealing ring is arranged in the gun body sealing groove.

[0020] Further preferably, the front section of the front body of the gun head has an inner diameter larger than that of the rear section, and the outer diameter of the front section is larger than that of the rear section; the front section of the rear body of the gun head has an inner diameter smaller than that of the rear section, and the outer diameter of the front section is smaller than that of the rear section, so as to form 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] Further preferably, the front section of the central top rod protrudes from the plane where the support spokes are located.

[0022] Further preferably, the front section of the cutting surface of the limiting sleeve has an inclined edge.

[0023] Further preferably, the outer wall of the limiting sleeve is provided with a circumferentially protruding push ring, facilitating the user to push and operate.

[0024] Further preferably, the valve port sealing ring is made of fluororubber.

[0025] Further preferably, the limiting steel ball is made of 304 stainless steel.

[0026] Further preferably, the main body sealing ring and the gun body sealing ring are made of butyronitrile rubber and have a circular cross section.

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

[0028] The present application has the following advantages:

[0029] 1. Completely solving the problem of 0.1 MPa low-pressure drop

[0030] The original "steel ball rigid locking + flexible sealing" dual-engine design: 80N locking force crushing air pressure impact: through the extrusion of the stainless steel ball in the inclined sleeve, a super 0.1 MPa air pressure impact force (50N) is generated, 60% of the rigid locking force, realizing 0.1-0.3 MPa drop rate of zero (conventional gun head 100% drop). Flexible fluororubber sealing ring (70 Shore A): low-pressure deformation rate increased by 40%, still tightly filling the gap between the valve ports at 0.1 MPa, leakage rate reduced to <0.07% (conventional gun head >12%).

[0031] 2. Operation efficiency doubled, labor cost reduced

[0032] One-hand 2-second lightning operation: 30° low-angle inclined surface design makes the sliding resistance only 25N (equivalent to lifting 2.5 kg of goods), and women can complete the operation with one hand; single-piece operation time <2 seconds (conventional threaded type >8 seconds), efficiency increased by 300%.

[0033] The average daily inflation volume exceeds 1,500 pieces: double that of traditional solutions (<800 pieces), and manpower input is reduced by 50%.

[0034] 3. Maintenance costs are reduced by 73% and service life is extended by 150%.

[0035] Modular segmented design:

[0036] Wearing parts such as steel balls (￥0.5 / piece) and fluororubber sealing rings (￥1 / piece) can be replaced separately, with a single maintenance cost of less than ￥40 (conventional overall replacement is greater than ￥150);

[0037] The life of key parts has been comprehensively upgraded: the wear resistance of stainless steel balls is greater than 20,000 times (conventional <8,000 times), and the corrosion resistance of the aluminum alloy body is greater than 5 years.

[0038] 4. Reconstructing industry technical standards

[0039] In the 0.1-0.3MPa air pressure zone where conventional technologies completely fail, it has achieved a breakthrough with "zero shedding, minimal leakage, and seconds of operation", becoming the new generation gold standard for inflation locking in the logistics cushion bag inflation field. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the overall cross-sectional structure of the present invention Figure 1 .

[0041] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention Figure 2 .

[0042] Figure 3 It is a structural diagram of the front body of the gun head.

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

[0044] In the figure: 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-center push rod, 32-support spoke, 51-limiting protrusion, 52-push hand ring. DETAILED DESCRIPTION

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

[0046] like Figures 1-4 As shown, this embodiment provides a quick-locking inflation gun head for logistics buffer inflation, which can be adapted to mainstream logistics buffer inflation bags. The details are as follows:

[0047] 1. Detailed description of the embodiment components

[0048] The quick-locking air gun head structure of the present embodiment is shown in Figure 1 The material, size and function of each component are as follows:

[0049] Gun head main body structure:

[0050] Gun head front main body 1: made of 6061 aluminum alloy die casting (yield strength 220 MPa), with the following specific dimensions:

[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 front section inner wall is provided with a valve port sealing groove 11 (depth 2mm, width 3mm) for installing a valve port sealing ring;

[0054] The front end outer wall is uniformly distributed with 6 stepped steel ball holes 12 (through the wall thickness): the hole diameter near the inner wall is φ2.8mm (< limit steel ball diameter φ3.2mm), and the hole diameter near the outer wall is φ3.5mm (> limit steel ball diameter φ3.2mm);

[0055] The rear section is provided with an internal thread (M20x1.5) connected with the external thread of the gun head rear main body 2.

[0056] Gun head rear main body 2: made of 6061 aluminum alloy die casting (yield strength 220 MPa), with the following specific dimensions:

[0057] Front section outer diameter: φ18mm (< rear section outer diameter φ25mm), front section provided with an external thread (M20x1.5) matching the internal thread of the gun head front main body 1;

[0058] The front section thread end is provided with a main body sealing groove 21 (depth 1.5mm, width 2mm) for installing a main body sealing ring 7;

[0059] Internally integrated die-cast valve core top rod mechanism 3: center top rod 31 (φ5mm) is provided at the center axis in the axial direction, fixedly connected with the inner wall of the gun head rear main body 2 through 3 circumferentially uniformly distributed support spokes 32 (φ2mm); the front section of the center top rod 31 protrudes 1.5mm from the plane where the support spokes 32 are located (to ensure the top opening of the valve core);

[0060] The rear end inner wall is provided with a G1 / 4 inch thread (adapted to the air outlet of mainstream air guns).

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

[0062] Limiting sleeve 5: ABS engineering plastic injection molding (wear coefficient 0.8) or 304 stainless steel material, its size:

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

[0064] · The rear end inner wall 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 front section of the section is a 30° bevel, that is, this part is an inclined surface. This design makes the compression of the steel ball more and more tight when pushing the limiting sleeve 5 forward, so that the locking is more and more tight, and when sliding backward, it will be more and more easy, so that the locking can be easily released.

[0066] · The outer wall is provided with a circumferential protruding push ring 52 (width 20mm, thickness 3mm, friction coefficient 0.9), which is convenient for the user to push.

[0067] 2, sealing system:

[0068] Valve port sealing ring 6: fluororubber material (hardness 70 Shore A), size φ22mm×φ18mm×2mm (outer diameter matched with valve port sealing groove 11 of the front body 1 of the gun head), placed in the valve port sealing groove 11; its inner diameter φ18mm (less than the inner diameter φ20mm of the inflation valve port), when the inflation valve port is inserted, the valve port end face extrudes the valve port sealing ring 6, forming a static seal.

[0069] Main body sealing ring 7: butadiene rubber material (circular cross section, diameter 1.8mm), placed in the main body sealing groove 21 of the rear body 2 of the gun head; when the front body 1 of the gun head and the rear body 2 of the gun head are screwed, the rear section of the front body 1 of the gun head extrudes the main body sealing ring 7, filling the gap between the threads.

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

[0071] 3. Assembly steps of the embodiment

[0072] Seal installation: Put the body sealing ring 7 into the body sealing groove 21 of the rear body 2.

[0073] Connection of 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, the rear section of the front body 1 and the front section of the rear body 2 form a circumferential sleeve limiting groove 13.

[0074] Seal installation: Put the valve port sealing ring 6 into the valve port sealing groove 11 of the front body 1, and press it to the bottom with a tool (ensure that it is tightly fitted with the groove wall).

[0075] Limiting steel ball installation: Put 6 limiting steel balls 4 into the stepped steel ball holes 11 of the front body 1 (1 ball per hole). At this time, the steel balls protrude 1.8 mm from the inner wall of the front body 1 (the depth of the inflation valve port groove), and protrude 0.3 mm from the outer wall (cooperate with the inner wall inclined surface of the limiting sleeve 5).

[0076] Sleeve limiting sleeve: Put the limiting sleeve 5 into the front end of the front body 1, and make the limiting protrusion 51 at the rear end of the limiting sleeve 5 placed in the sleeve limiting groove 13. Push the limiting sleeve 5 to slide along the axial direction, and confirm that it can smoothly slide in the sleeve limiting groove 13.

[0077] 4. Working principle of the embodiment

[0078] The quick locking-inflation process of the embodiment is as shown in the figure, and the specific process is as follows: Figure 2

[0079] Docking and sealing: Insert the inflation valve port into the front end of the front body 1, and the front section of the center top rod 31 (protruding 1.5 mm from the support spoke) pushes against the valve core inside the inflation valve port (shrinking 2 mm inside, opening the valve port); at the same time, the valve port end face extrudes the valve port sealing ring 6 (fluorine rubber), forming a static seal.

[0080] ​Rigid locking: push the push ring 52 of the limiting sleeve 5 (axially forward), when the limiting protrusion of the limiting sleeve 5 slides to the front end of the sleeve limiting groove 13, the 30° slope of the front segment inner wall completely covers the stepped steel ball hole 12, extruding the limiting steel ball 4 (304 stainless steel, φ3.2mm) to move radially inward by 1.8mm, and clamping 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%). Rigid locking is achieved.

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

[0082] Unlocking and resetting: after inflation is completed, pull the push ring 52 of the limiting sleeve 5 (axially backward), when the limiting protrusion slides to the last end of the sleeve limiting groove, the slope of the limiting sleeve 5 disengages from the stepped steel ball hole, and the limiting steel ball 4 moves radially outward by 1.8mm (reset to the stepped steel ball hole) under the elastic restoring force of the inflation valve port groove; At the same time, the valve core of the inflation valve port resets (closes the valve port to prevent gas leakage) under the action of the spring force; Finally, pull out the gun head, and the inflation is completed.

[0083] 5. Effect comparison of the embodiment

[0084] The effect comparison of the embodiment with the prior art (buckle type gun head) is as follows:

[0085] Indicator Prior art This embodiment Drop-off rate (0.1 MPa) 100％ 0％ Drop-off rate (0.3 MPa) 100％ 0％ Total leakage rate (%) 2 ＜0.15 Operation time (seconds per piece) 8 ＜2 Maintenance cost (yuan per time) 150 ＜40 Service life (times) 8000 ＞20000

[0086] 6. Application scenarios of the embodiment

[0087] Application scenarios: e-commerce small logistics (inflation bag pressure ≤0.3MPa);

[0088] Efficiency improvement: daily inflation capacity is increased from less than 800 to 1500;

[0089] Cost advantage: a single set of system replaces the traditional scheme, and the procurement cost is directly reduced by 50%.

[0090] 7. Summary of the embodiment

[0091] The embodiment solves the pain points of the prior art, such as "locking drop", "high leakage rate", "complicated operation" and "difficult maintenance", through the rigid locking mechanism of "limiting sleeve + stepped steel ball hole + limiting steel ball", the triple sealing system of "valve port sealing ring + main body sealing ring + gun body sealing ring", and the segmented main body design, and 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 gun head for logistics buffer inflation, characterized in that: include: The main body of the gun head is cylindrical in shape, with a hollow air-filled passage 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 around the circumference; the stepped steel ball holes penetrate the wall thickness; The limiting steel balls are arranged in the stepped steel ball holes in the same number as the stepped steel ball holes, and have a diameter smaller than the outer wall diameter of the stepped steel ball holes and larger than the inner wall diameter of the stepped steel ball holes, and part of the volume protrudes from the inner wall of the gun head body; A limiting sleeve is nested on the outside of the gun head body, and a circumferentially extending limiting protrusion is provided at the end of its inner wall, and the limiting protrusion is placed in the sleeve limiting groove and slides along its axial direction; when the limiting protrusion slides to the rearmost end of the sleeve limiting groove, the front section of the limiting sleeve covers part of the stepped steel ball hole, restricting the limiting steel ball from escaping from the outer wall opening of the stepped steel ball hole; when the limiting protrusion slides to the frontmost end of the sleeve limiting groove, the front section of the limiting sleeve completely covers the stepped steel ball hole, and its inner wall squeezes the limiting steel ball inwardly; The valve core push rod mechanism includes an integrally formed central push rod and supporting spokes; the central push rod is axially arranged at the central axis of the gun head body and is fixedly connected to the inner wall of the gun head body through supporting spokes evenly distributed circumferentially; The valve port sealing ring is in the shape of a ring and is placed in the front section of the inflation channel of the gun head body, between the stepped steel ball hole and the supporting spokes; its periphery fits tightly with the inner wall of the gun head body, and its inner diameter is smaller than the inner diameter of the valve port of the inflation valve.

2. A quick-locking inflation gun head for logistics buffer inflation according to claim 1, characterized in that: A circle of valve port sealing grooves is circumferentially provided on 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.

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

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

5. A quick-locking inflation gun head for logistics buffer inflation as claimed in claim 3, characterized in that: The external thread end of the front section of the rear body of the gun head is circumferentially provided with a circle of main body sealing groove, and the main body sealing ring is installed in the main body sealing groove; the internal thread end of the rear section of the rear body of the gun head is provided with a circle of gun body sealing groove, and the gun body sealing ring is installed in the gun body sealing groove.

6. A quick-locking inflation gun head for logistics buffer inflation as claimed 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 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.

7. A quick-locking inflation gun head for logistics buffer inflation according to claim 1, characterized in that: The front section of the central push rod protrudes from the plane where the supporting spokes are located.

8. A quick-locking inflation gun head for logistics buffer inflation according to claim 1, characterized in that: The inner edge of the front section of the cross section of the limiting sleeve is a beveled edge.

9. A quick-locking inflation gun head for logistics buffer inflation according to claim 1, characterized in that: The outer wall of the limiting sleeve is provided with a circumferentially protruding push handle ring.

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