Striker nozzle structure and injection device

Abstract

The utility model relates to the technical field of fluid jet equipment, in particular to a firing pin nozzle structure and a jet device. The firing pin nozzle structure in the spraying device comprises a firing pin and a nozzle, the nozzle is provided with a containing cavity and a discharging channel which are coaxially communicated from top to bottom, and an opening for the firing pin to stretch in is formed in the end, away from the discharging channel, of the containing cavity in the axial direction. The radial section area of the containing cavity extends from the end close to the opening to the end close to the discharging channel in the axial direction to be gradually reduced, the soldering paste is contained in the containing cavity, the firing pin abuts against the inner circumferential wall of the containing cavity, the discharging channel comprises a first discharging part, a second discharging part and a third discharging part which are sequentially and coaxially communicated, and the third discharging part is communicated with the containing cavity. The radial cross-sectional areas of the third discharging part, the second discharging part and the first discharging part are sequentially reduced, the radial cross-sectional area of the third discharging part is gradually reduced by extending from one end close to the containing cavity to the direction far away from the containing cavity in the axial direction, and the maximum radial cross-sectional area of the third discharging part is the minimum radial cross-sectional area of the containing cavity.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid injection equipment technical field especially punch nozzle structure and injection device. BACKGROUND

[0002] In the field of electronic manufacturing, SMT (Surface Mounted Technology) is undoubtedly one of the key technologies to promote the miniaturization, light weight and high efficiency of electronic products. Screen printing of solder paste is a crucial process in SMT, which provides a solid guarantee for the quality and reliability of electronic products with its fine process. Solder paste jetting process in solder paste screen printing technology has higher precision, which can significantly improve productivity compared with solder paste coating process.

[0003] In the prior art, the ejector pin is driven by the injection device to eject the solder paste in the nozzle to the outside. Since the solder paste has a certain viscosity at room temperature, the solder paste is prone to accumulate in the interior of the nozzle. After completing a single solder paste injection, the remaining solder paste accumulates on the nozzle under the action of its own viscosity, resulting in a gap at the nozzle injection port, which causes the same solder paste as the previous one to be unable to be ejected during the next solder paste injection. The injection amount of solder paste is inconsistent, which cannot guarantee the stability of the ejector pin for the injection of solder paste in the nozzle, thereby affecting the processing quality of subsequent products.

[0004] Therefore, it is urgent to invent a punch nozzle structure and injection device to solve the above problems. INVENTION CONTENTS

[0005] The utility model aims at providing punch nozzle structure and injection device to realize the stable injection of solder paste in the nozzle and ensure the consistency of the solder paste injection amount.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The punch nozzle structure comprises:

[0008] an ejector pin; and

[0009] a nozzle having a containing cavity and a discharge channel coaxially communicated from top to bottom, the containing cavity being provided with an open end for the ejector pin to extend into at an end axially away from the discharge channel, the radial cross-sectional area of the containing cavity gradually decreasing from the end close to the open end along the axial direction towards the end close to the discharge channel, solder paste being contained in the containing cavity, the ejector pin abutting against the inner peripheral wall of the containing cavity around the axial direction along the axial direction;

[0010] The discharge channel comprises a first discharge part, a second discharge part and a third discharge part connected in sequence from bottom to top and coaxially communicated, the third discharge part is coaxially communicated with the lower end of the accommodating cavity, the radial cross-sectional areas of the third discharge part, the second discharge part and the first discharge part gradually decrease, the radial cross-sectional area of the third discharge part gradually decreases from the end close to the accommodating cavity along the axial direction away from the accommodating cavity, and the maximum radial cross-sectional area of the third discharge part is the minimum radial cross-sectional area of the accommodating cavity.

[0011] As an option, the inner diameter of the first discharge part is D1, and the D1=0.02mm~0.6mm.

[0012] As an option, the extension distance of the first discharge part along the axial direction is L1, and the ratio of the D1 to the L1 is 1.5~4.

[0013] As an option, the included angle between the inner circumferential wall of the accommodating cavity and the central axis of the accommodating cavity is α, and the α=30°~50°.

[0014] As an option, the included angle between the inner circumferential wall of the third discharge part and the central axis of the third discharge part is β, and the β=7.5°~22.5°.

[0015] As an option, the lower end surface of the nozzle is provided with a guide inclined surface, the guide inclined surface extends outward along the horizontal direction while being inclined upward with the first discharge part as the center.

[0016] As an option, the slope angle of the guide inclined surface inclined upward relative to the horizontal plane is φ, and the φ=3°~8°.

[0017] As an option, the striker comprises a striker head, a transition part, a striker middle part and a striker tail part connected in sequence, the diameters of the striker head, the transition part, the striker middle part and the striker tail part gradually increase, and the striker head is configured to extend into the accommodating cavity and abut against the inner circumferential wall of the accommodating cavity.

[0018] As an option, the diameter of the transition part gradually decreases from the end away from the striker head to the end close to the striker head, the included angle between the transition part and the central axis of the striker head is δ, and the δ=15°~45°.

[0019] The injection device comprises a mounting body, a driving structure and the striker nozzle structure, the nozzle is fixed on the mounting body, and the driving structure is used for driving the striker to move along the axial direction relative to the nozzle.

[0020] The beneficial effects of the utility model are as follows:

[0021] The utility model provides a structure of the plunger nozzle, through setting the accommodating cavity and the discharge channel of coaxial conduction from top to bottom in the nozzle, the solder paste is contained in the accommodating cavity, through setting the open mouth in the accommodating cavity along the axial direction away from the one end of discharge channel, the plunger is along the open mouth and extends into the accommodating cavity and with the inner peripheral wall of accommodating cavity abuts, can along the discharge channel of solder paste in the accommodating cavity discharge, through guaranteeing the radial section area of accommodating cavity gradually reduces along the axial direction from the one end close to the open mouth to the one end close to the discharge channel, can provide the direction for the flow of solder paste to the discharge channel, through setting the first discharge portion, second discharge portion and third discharge portion of coaxial conduction from below to top in turn for the discharge channel, the third discharge portion and the lower end of accommodating cavity are coaxial conduction, and guarantee the radial section area of third discharge portion, second discharge portion and first discharge portion reduces in turn, can provide the direction for the discharge of solder paste along the discharge channel, through making the radial section area of third discharge portion gradually reduces along the axial direction from the one end close to the accommodating cavity to the one end away from the accommodating cavity, the maximum radial section area of third discharge portion is the minimum radial section area of accommodating cavity, can provide the direction for the flow of solder paste between accommodating cavity and third discharge portion, further guaranteeing that solder paste can fully flow into the lower end of accommodating cavity and fully discharge along the discharge channel when flowing under the action of gravity, further guaranteeing the consistency of the injection amount of solder paste, guaranteeing the processing effect of subsequent product.

[0022] The embodiment also provides a spraying device, which can guarantee the consistency of the injection amount of solder paste and the processing effect of subsequent product by applying the plunger nozzle structure. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structure schematic view of the plunger nozzle structure provided by the utility model embodiment;

[0024] Figure 2 is a cross section schematic view of the plunger nozzle structure provided by the utility model embodiment;

[0025] Figure 3 is Figure 2 the local enlarged view of A in Fig.

[0026] Figure 4 is a cross section schematic view of the nozzle provided by the utility model embodiment;

[0027] Figure 5 is a cross section schematic view of the plunger provided by the utility model embodiment;

[0028] Figure 6 is a structure schematic view of the spraying device provided by the utility model embodiment;

[0029] Figure 7 is a cross section schematic view of the spraying device provided by the utility model embodiment.

[0030] In the drawings:

[0031] 100, firing pin; 110, firing pin head; 120, firing pin middle; 130, firing pin tail; 140, transition;

[0032] 200, nozzle; 210, accommodating cavity; 220, discharge channel; 221, first discharge part; 222, second discharge part; 223, third discharge part; 230, guide slope;

[0033] 300, guide ring;

[0034] 400, locking cap;

[0035] 500, sealing member;

[0036] 600, mounting body;

[0037] 700, fixing seat;

[0038] 800, locking member;

[0039] 900, butt joint. DETAILED DESCRIPTION

[0040] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model will be further explained below in combination with the drawings and through specific embodiments.

[0041] In the description of the utility model, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0042] In the utility model, unless explicitly defined and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0043] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0044] In the solder paste spraying process, the solder paste in the nozzle is sprayed to the outside by using a spraying device to drive the plunger. Since the solder paste has a certain viscosity at room temperature, the solder paste is easy to accumulate in the inside of the nozzle. After completing the spraying of the solder paste once, the remaining solder paste is accumulated on the nozzle under the action of its own viscosity, and a gap appears at the spraying port of the nozzle, which causes the same solder paste as the last time to be unable to be sprayed in the next spraying of the solder paste. The spraying amount of the solder paste is inconsistent, the stability of the plunger for spraying the solder paste in the nozzle cannot be guaranteed, and the processing quality of the subsequent product is affected.

[0045] In order to solve the above problems, as shown in Figures 1-3 The plunger nozzle structure includes a plunger 100 and a nozzle 200. The nozzle 200 has a containing cavity 210 and a discharging channel 220 coaxially communicated from top to bottom. The containing cavity 210 is provided with an open end for the plunger 100 to extend into, and the radial cross-sectional area of the containing cavity 210 gradually decreases from the end close to the open end to the end close to the discharging channel 220 along the axial direction. The solder paste is contained in the containing cavity 210, and the plunger 100 abuts against the inner peripheral wall of the containing cavity 210 around the axial direction. The discharging channel 220 includes a first discharging part 221, a second discharging part 222, and a third discharging part 223 connected in sequence and coaxially communicated from bottom to top. The third discharging part 223 is coaxially communicated with the containing cavity 210, and the radial cross-sectional areas of the third discharging part 223, the second discharging part 222, and the first discharging part 221 gradually decrease in sequence. The radial cross-sectional area of the third discharging part 223 gradually decreases from the end close to the containing cavity 210 to the end away from the containing cavity 210 along the axial direction. The maximum radial cross-sectional area of the third discharging part 223 is the minimum radial cross-sectional area of the containing cavity 210.

[0046] The impact nozzle structure features a coaxially connected receiving cavity 210 and a discharge channel 220 within the nozzle 200. Solder paste is contained within the receiving cavity 210. An opening is provided at one end of the receiving cavity 210 axially away from the discharge channel 220. The impact pin 100 extends into the receiving cavity 210 through this opening and abuts against the inner circumferential wall of the receiving cavity 210, allowing the solder paste to be discharged along the discharge channel 220. By ensuring that the radial cross-sectional area of ​​the receiving cavity 210 gradually decreases from the end near the opening towards the end near the discharge channel 220, the flow of solder paste towards the discharge channel 220 is guided. The discharge channel 220 is configured as a first discharge section 221, a second discharge section 222, and a third discharge section 223, coaxially connected from bottom to top. The third discharge section 222... 23 is coaxially connected to the lower end of the receiving cavity 210, and ensures that the radial cross-sectional areas of the third discharge section 223, the second discharge section 222, and the first discharge section 221 decrease sequentially. This provides guidance for the discharge of solder paste along the discharge channel 220. By making the radial cross-sectional area of ​​the third discharge section 223 gradually decrease from the end near the receiving cavity 210 along the axial direction away from the receiving cavity 210, the maximum radial cross-sectional area of ​​the third discharge section 223 is equal to the minimum radial cross-sectional area of ​​the receiving cavity 210. This provides guidance for the flow of solder paste between the receiving cavity 210 and the third discharge section 223, thereby ensuring that when the solder paste flows under its own gravity, it can fully flow into the lower end of the receiving cavity 210 and be fully discharged along the discharge channel 220. This ensures the consistency of the solder paste spray volume and guarantees the processing effect of subsequent products.

[0047] In this embodiment, as Figure 4 As shown, the inner diameter of the first discharge section 221 is D1, where D1 = 0.02mm to 0.6mm. By limiting the inner diameter D1 of the first discharge section 221 to between 0.02mm and 0.6mm, it can be ensured that the solder paste is ejected from the first discharge section 221 at a sufficiently fast speed and with sufficiently high pressure, thus meeting the requirements for solder paste ejection. It should be noted that in this embodiment, the inner diameter D1 of the first discharge section 221 is 0.1mm. In other embodiments, the size of D1 can be arbitrarily adjusted within the range of 0.02mm to 0.6mm according to actual needs; this embodiment does not impose specific limitations.

[0048] In addition, the first discharge part 221 has an axial extension distance L1, and a ratio of D1 to L1 is 1.5-4. By limiting the ratio of the inner diameter D1 of the first discharge part 221 to the axial extension distance L1 of the first discharge part 221 to be between 1.5 and 4, the subsequent processing of the first discharge part 221 can be facilitated. It should be noted that in the present embodiment, the ratio of D1 to L1 is 2. In other embodiments, the ratio of D1 to L1 can be adjusted within the range of 1.5-4 according to actual needs, and the present embodiment is not limited in this regard.

[0049] As an optional solution, an included angle between the inner circumferential wall of the accommodation cavity 210 and the central axis of the accommodation cavity 210 is α, and α = 30°-50°. By limiting the specific value of the included angle α between the inner circumferential wall of the accommodation cavity 210 and the central axis of the accommodation cavity 210 to be between 30° and 50°, the solder paste in the accommodation cavity 210 can flow smoothly along the inner circumferential wall of the accommodation cavity 210 to the lower end of the accommodation cavity 210 under the action of its own gravity, and the guiding effect on the solder paste is good. In the present embodiment, the included angle α between the inner circumferential wall of the accommodation cavity 210 and the central axis of the accommodation cavity 210 is 45°. In other embodiments, the size of α can be adjusted within the range of 30°-50° according to actual needs and the specific specifications of the solder paste, and the present embodiment is not limited in this regard.

[0050] In an optional solution, an included angle between the inner circumferential wall of the third discharge part 223 and the central axis of the third discharge part 223 is β, and β = 7.5°-22.5°. By limiting the specific value of the included angle β between the inner circumferential wall of the third discharge part 223 and the central axis of the third discharge part 223 to be between 7.5° and 22.5°, the solder paste flowing into the third discharge part 223 at the lower end of the accommodation cavity 210 can be guided. If the β angle is too large, the guiding effect of the third discharge part 223 is not good. If the β angle is too small, the third discharge part 223 does not play a guiding role for the solder paste. It should be noted that in the present embodiment, the included angle β between the inner circumferential wall of the third discharge part 223 and the central axis of the third discharge part 223 is 15°. In other embodiments, the size of β can be adjusted within the range of 7.5°-22.5° according to actual needs, and the present embodiment is not limited in this regard.

[0051] It should be noted that the inner diameter D2 of the second discharge part 222 is between 0.1 mm and 0.8 mm, the second discharge part 222 has an axial extension distance L2, and the ratio of D2 to L2 is between 1.5 and 4. In the present embodiment, the inner diameter D2 of the second discharge part 222 is 0.5 mm, and the ratio of D2 to L2 is 2. In other embodiments, the size of D2 can be adjusted within the range of 0.1 mm-0.8 mm and the ratio of D2 to L2 can be adjusted within the range of 1.5-4 according to actual needs, and the present embodiment is not limited in this regard.

[0052] In addition, the third discharge part 223 has an axial extension distance L3, the minimum inner diameter of the third discharge part 223 is equal to the inner diameter D2 of the second discharge part 222, and the maximum inner diameter of the third discharge part 223 is equal to the minimum inner diameter of the accommodating cavity 210. The axial extension distance L3 of the third discharge part 223 can be adjusted according to the size of β.

[0053] In order to improve the discharge effect of the solder paste along the first discharge part 221, the lower end surface of the nozzle 200 is provided with a guide slope 230. The guide slope 230 is inclined upward while extending outward along the horizontal direction with the first discharge part 221 as the center. When the solder paste is discharged along the first discharge part 221, the solder paste will splash onto the lower end surface of the nozzle 200. By providing the guide slope 230 on the lower end surface of the nozzle 200, which is inclined upward while extending outward along the horizontal direction with the first discharge part 221 as the center, the solder paste splashed onto the lower end surface of the nozzle 200 can be accumulated at the lower end of the first discharge part 221 under the action of its own gravity and the guide of the guide slope 230, facilitating subsequent cleaning.

[0054] Specifically, the slope angle of the guide slope 230 inclined upward relative to the horizontal plane is φ, and φ = 3°-8°. It should be noted that in the present embodiment, the angle φ of the guide slope 230 inclined upward relative to the horizontal plane is 5°. In other embodiments, φ can be adjusted arbitrarily within the range of 3°-8° according to actual needs, and the present embodiment does not make specific limitations.

[0055] In combination with Figure 1 and Figure 5 The specific structure of the impact pin 100 will be described. The impact pin 100 includes an impact pin head portion 110, a transition portion 140, an impact pin middle portion 120, and an impact pin tail portion 130 connected in sequence. The diameters of the impact pin head portion 110, the transition portion 140, the impact pin middle portion 120, and the impact pin tail portion 130 increase in sequence, and the impact pin head portion 110 is configured to extend into the accommodating cavity 210 and abut against the inner circumferential wall of the accommodating cavity 210. By configuring the impact pin 100 as the impact pin head portion 110, the transition portion 140, the impact pin middle portion 120, and the impact pin tail portion 130 connected in sequence, and ensuring that the diameters of the impact pin head portion 110, the transition portion 140, the impact pin middle portion 120, and the impact pin tail portion 130 decrease in sequence, the impact pin head portion 110 can be easily extended into the accommodating cavity 210.

[0056] In addition, the diameter of the transition portion 140 gradually decreases while extending from one end away from the striker head 110 towards the striker head 110, and the angle between the transition portion 140 and the central axis of the striker head 110 is δ, δ = 15°-45°. By setting the diameter of the transition portion 140 to gradually decrease while extending from one end away from the striker head 110 towards the striker head 110, the outer peripheral wall of the transition portion 140 provides a guide for the striker 100 to extend into the accommodation cavity 210. If the angle δ is too large, it will affect the smooth flow of the solder paste to the lower end of the accommodation cavity 210; if the angle δ is too small, it will result in an excessively long length of the transition portion 140, affecting the normal production of the striker 100. It should be noted that in the present embodiment, δ is 20°. In other embodiments, δ can be adjusted within the range of 15°-45° according to actual needs, and the present embodiment is not limited in this regard.

[0057] In addition, the axial length A1 of the striker head 110 is 0.5mm-4mm. In the present embodiment, the axial length A1 of the striker head 110 is 2mm. In other embodiments, the axial length A1 of the striker head 110 can be adjusted within the range of 0.5mm-4mm according to actual needs, and the present embodiment is not limited in this regard.

[0058] The present embodiment also provides a spraying device, as shown in Figure 6 and Figure 7 The spraying device includes a mounting body 600, a driving structure, and a striker nozzle structure as described above, the nozzle 200 is fixed on the mounting body 600, and the driving structure is used to drive the striker 100 to move axially relative to the nozzle 200. By applying the striker nozzle structure described above, the spraying device can ensure the consistency of the solder paste spraying amount and ensure the processing effect of the subsequent product.

[0059] Specifically, the spraying striker further includes a guide ring 300, a locking cap 400, a sealing member 500, a fixing seat 700, a locking member 800, and a butt joint 900, wherein the mounting body 600 has a spraying cavity, the spraying cavity is provided with a spraying port and an insertion port, the nozzle 200 is fixed between the guide ring 300 and the locking cap 400, the guide ring 300 is fixed with the inner cavity wall of the spraying cavity, and the locking cap 400 is fixed with the outer peripheral wall of the spraying cavity to fix the nozzle 200 at the spraying port of the spraying cavity, the sealing member 500 is used for the insertion port, the striker 100 extends into the spraying cavity along the insertion port and strikes the nozzle 200. The fixing seat 700 is provided with the butt joint 900, the butt joint 900 is in communication with a storage bin storing solder paste, and the locking member 800 can fixedly mount the fixing seat 700 and the mounting body 600, so as to form a material conveying channel in communication with the spraying cavity in the butt joint 900, the fixing seat 700 and the mounting body 600, so as to input the solder paste into the spraying cavity along the material conveying channel.

[0060] It should be noted that in the present embodiment, the butt joint 900 is a luer joint. The luer joint has good sealing effect. In other embodiments, the butt joint 900 can also be a conventional joint, which is not specifically limited in the present embodiment.

[0061] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A firing pin nozzle structure, characterized in that, include: Firing pin (100); and The nozzle (200) has a receiving cavity (210) and a discharge channel (220) that are coaxially connected from top to bottom. The receiving cavity (210) has an opening at one end axially away from the discharge channel (220) for the ejector pin (100) to extend into. The radial cross-sectional area of ​​the receiving cavity (210) gradually decreases from the end near the opening to the end near the discharge channel (220). Solder paste is contained in the receiving cavity (210). The ejector pin (100) abuts against the inner peripheral wall of the receiving cavity (210) around the axial direction. The discharge channel (220) includes a first discharge section (221), a second discharge section (222), and a third discharge section (223) connected sequentially from bottom to top and coaxially connected. The third discharge section (223) is coaxially connected to the lower end of the receiving cavity (210). The radial cross-sectional areas of the third discharge section (223), the second discharge section (222), and the first discharge section (221) decrease sequentially. The radial cross-sectional area of ​​the third discharge section (223) gradually decreases as it extends axially away from the receiving cavity (210) from the end near the receiving cavity (210). The maximum radial cross-sectional area of ​​the third discharge section (223) is the minimum radial cross-sectional area of ​​the receiving cavity (210).

2. The firing pin nozzle structure according to claim 1, characterized in that, The inner diameter of the first discharge section (221) is D1, where D1 = 0.02 mm to 0.6 mm.

3. The firing pin nozzle structure according to claim 2, characterized in that, The first discharge section (221) extends along the axial direction by a distance L1, and the ratio of D1 to L1 is 1.5 to 4.

4. The firing pin nozzle structure according to claim 1, characterized in that, The angle between the inner peripheral wall of the receiving cavity (210) and the central axis of the receiving cavity (210) is α, where α = 30° to 50°.

5. The firing pin nozzle structure according to claim 1, characterized in that, The angle between the inner peripheral wall of the third discharge section (223) and the central axis of the third discharge section (223) is β, where β = 7.5° to 22.5°.

6. The firing pin nozzle structure according to claim 1, characterized in that, The lower end face of the nozzle (200) is provided with a guide slope (230), which extends outward in the horizontal direction with the first discharge part (221) as the center and tilts upward.

7. The firing pin nozzle structure according to claim 6, characterized in that, The guide ramp (230) is inclined upward at an angle φ relative to the horizontal plane, where φ = 3° to 8°.

8. The firing pin nozzle structure according to claim 1, characterized in that, The firing pin (100) includes a firing pin head (110), a transition portion (140), a firing pin middle portion (120), and a firing pin tail (130) connected in sequence. The diameters of the firing pin head (110), the transition portion (140), the firing pin middle portion (120), and the firing pin tail (130) increase sequentially. The firing pin head (110) is configured to extend into the receiving cavity (210) and abut against the inner peripheral wall of the receiving cavity (210).

9. The firing pin nozzle structure according to claim 8, characterized in that, The diameter of the transition portion (140) gradually decreases as it extends from the end away from the head of the firing pin (110) toward the head of the firing pin (110), and the angle between the transition portion (140) and the central axis of the head of the firing pin (110) is δ, where δ = 15° to 45°.

10. A spraying device, characterized in that, The device includes a mounting body (600), a drive structure, and a firing pin nozzle structure as described in any one of claims 1 to 9, wherein the nozzle (200) is fixed on the mounting body (600), and the drive structure is used to drive the firing pin (100) to move relative to the nozzle (200) along the axial direction.

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