Piston applied to dispensing barrel

Abstract

The utility model relates to the technical field of dispensing accessories, and discloses a piston applied to a dispensing barrel, which comprises a piston body arranged in the dispensing barrel, the rough scraper is arranged around the peripheral surface of the piston body and radially protrudes out of the piston body; the first fine scraper is arranged around the peripheral surface of the piston body and radially protrudes out of the piston body; the radial distance between the first fine scraper and the center line of the piston body is larger than the radial distance between the rough scraper and the center line of the piston body, so that a transition space for overflowing or exhausting is formed between the rough scraper and the first fine scraper. And the first exhaust holes are uniformly formed in the first fine scraper. And the problem of plug jumping during dispensing or solder paste applying is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of glue dispensing accessories, in particular to a piston used in a glue dispensing cylinder. Background Art

[0002] Currently, when some products need to be dispensed, dispensing syringes are often used to perform the dispensing operation.

[0003] Existing dispensing syringes typically consist of a needle, barrel, piston, and propulsion mechanism. The piston is subject to glue pressure during both the injection and dispensing processes. Conventional pistons lack a vent mechanism, which can easily lead to trapped air bubbles within the glue, causing the piston to pop. However, existing syringes that directly utilize vent holes on the market often cause glue to accumulate at the vent holes during the injection process, preventing the bubbles from being properly expelled.

[0004] Therefore, improvements need to be made to this. Utility Model Content

[0005] The technical problem solved by the present invention is to provide a piston applied to a dispensing cylinder in order to solve the problems raised in the above-mentioned background technology in view of the defects existing in the above-mentioned prior art.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: A piston used in a dispensing barrel, comprising: a piston body, the piston body being configured in the dispensing barrel; a coarse scraper, the coarse scraper being arranged around the outer circumference of the piston body, and the coarse scraper radially protruding from the piston body; a first fine scraper, the first fine scraper being arranged around the outer circumference of the piston body, and the first fine scraper radially protruding from the piston body; wherein the radial distance between the first fine scraper and the center line of the piston body is greater than the radial distance between the coarse scraper and the center line of the piston body, so that a transition space for overflow or exhaust is formed between the coarse scraper and the first fine scraper; a first exhaust hole, there are more than one first exhaust holes, and the first exhaust holes are evenly arranged on the first fine scraper.

[0007] Furthermore, the first fine scraper is arranged adjacent to the coarse scraper.

[0008] Furthermore, the first fine scraper and the coarse scraper are an integrated structure.

[0009] Furthermore, it includes a second scraper, which is arranged around the outer peripheral surface of the piston body. The second scraper is spaced apart from the first fine scraper. There is a gap between the second scraper and the dispensing cylinder to discharge the gas through the first exhaust hole.

[0010] Furthermore, it includes a third fine scraper, which is arranged around the outer peripheral surface of the piston body, and is arranged on the side of the second scraper away from the first fine scraper. Second exhaust holes are evenly arranged on the third fine scraper, and the second exhaust holes discharge the gas passing through the second scraper.

[0011] Furthermore, the front end of the piston body is a tapered surface, and the first fine scraper extends obliquely in a direction away from the tapered surface.

[0012] Furthermore, the extending direction of the second scraper is the same as the extending direction of the first fine scraper.

[0013] Furthermore, the extending direction of the third fine scraper is the same as the extending direction of the first fine scraper.

[0014] Furthermore, the piston body is a hollow structure, and a reinforcing rib is provided on the inner wall of the piston body close to the conical surface.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] Through the transition space formed between the coarse scraper and the first fine scraper, when the coarse scraper applies pressure to scrape the glue, the gas in the glue and a small amount of glue can overflow into the transition space, allowing the gas to be discharged from the first exhaust hole, which can completely solve the problem of plugging when dispensing glue or solder paste.

[0017] The coordination of the first, second and third fine scrapers with an interval design can maximize the use of syringe glue or solder paste and avoid waste of raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the utility model.

[0019] Figure 2 It is a structural schematic diagram of the utility model from another angle.

[0020] Figure 3 It is a schematic structural diagram of the utility model.

[0021] Figure 4 It is a cross-sectional structural diagram of the present utility model.

[0022] Figure 5 yes Figure 4 Schematic diagram of the local enlarged structure.

[0023] Figure numerals: 1. piston body; 2. rough scraper; 3. first fine scraper; 4. transition space; 5. first exhaust hole; 6. second scraper; 7. third fine scraper; 8. second exhaust hole; 9. tapered surface; 10. reinforcing rib. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] The embodiments described with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application. In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present application, "several" or "multiple" means two or more, unless otherwise specifically defined. In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; or internal communication between two components. A person skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them. Furthermore, "above," "above," and "above" a first feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher level than the second feature. "Below," "below," and "below" a first feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a lower level than the second feature.

[0026] In view of the technical problems recorded in the background technology, such as Figure 1-5As shown, a piston for a dispensing cylinder is provided, comprising: a piston body 1, wherein the piston body 1 is configured in the dispensing cylinder; a coarse scraper 2, wherein the coarse scraper 2 is arranged around the outer circumference of the piston body 1, and the coarse scraper 2 radially protrudes from the piston body 1; a first fine scraper 3, wherein the first fine scraper 3 is arranged around the outer circumference of the piston body 1, and the first fine scraper 3 radially protrudes from the piston body 1; wherein the radial distance between the first fine scraper 3 and the center line of the piston body 1 is greater than the radial distance between the coarse scraper 2 and the center line of the piston body 1, so that a transition space 4 for overflow or exhaust is formed between the coarse scraper 2 and the first fine scraper 3; a first exhaust hole 5, wherein there is more than one first exhaust hole 5, and the first exhaust holes 5 are evenly arranged on the first fine scraper 3.

[0027] The piston body 1 is used to be installed in the dispensing cylinder. Under the action of the pushing mechanism, the piston body 1 moves in the dispensing cylinder to push and extrude the raw materials in the dispensing cylinder.

[0028] In the above technical solution, a coarse scraper 2 and a first fine scraper 3 are provided on the outer circumferential surface of the piston body 1. Due to the different radial distances between the coarse scraper 2 and the first fine scraper 3 relative to the centerline of the piston body 1, a transition space 4 having a certain volume is formed. The radial distances between the coarse scraper 2 and the first fine scraper 3 relative to the centerline of the piston body 1 can be adjusted according to actual use requirements and are not restricted. When the piston body 1 moves within the dispensing barrel, the coarse scraper 2 scrapes away most of the raw material, and the first fine scraper 3 scrapes away the small amount of residual raw material. At the same time, gas in the raw material enters the transition space 4 formed by the coarse scraper 2 and the first fine scraper 3, and the gas is discharged through the first exhaust hole 5.

[0029] Through this structural design, the gas in the raw material and a small amount of raw material can overflow into the transition space 4, so that the gas can be discharged from the first exhaust hole 5, which can completely solve the problem of plugging when dispensing glue or solder paste.

[0030] The first fine scraper 3 and the coarse scraper 2 can be spaced apart according to implementation requirements. Preferably, the first fine scraper 3 is arranged adjacent to the coarse scraper 2. The first fine scraper 3 and the coarse scraper 2 are an integrated structure.

[0031] Preferably, a second scraper 6 is included, and the second scraper 6 is arranged around the outer circumference of the piston body 1, and the second scraper 6 is spaced apart from the first fine scraper 3. The second scraper 6 has a gap in the inner wall of the dispensing cylinder, and exhausts the air through the first exhaust hole 5. Specifically, the air is discharged through the first exhaust hole 5 on the first fine scraper 3 and then discharged through the gap between the second scraper 6 and the inner wall of the dispensing cylinder.

[0032] Furthermore, a third fine scraper 7 is provided around the outer circumference of the piston body 1 and on a side of the second scraper 6 away from the first fine scraper 3. Second exhaust holes 8 are evenly provided on the third fine scraper 7. The second exhaust holes 8 exhaust the gas passing through the second scraper 6.

[0033] The third fine scraper 7 is used to scrape away a small amount of residual raw material. At the same time, the second exhaust hole 8 designed on the third fine scraper 7 will discharge the gas passing through the second scraper 6. Specifically, the gas is discharged through the first exhaust hole 5 on the first fine scraper 3, then discharged through the gap between the second scraper 6 and the inner wall of the dispensing cylinder, and finally discharged through the second exhaust hole 8 set on the third fine scraper 7.

[0034] Preferably, the front end of the piston body 1 is a tapered surface 9 , and the first fine scraper 3 extends obliquely in a direction away from the tapered surface 9 .

[0035] Preferably, the extending direction of the second scraper 6 is the same as the extending direction of the first fine scraper 3 .

[0036] Preferably, the extending direction of the third fine scraper 7 is the same as the extending direction of the first fine scraper 3 .

[0037] Preferably, the piston body 1 is a hollow structure, and a reinforcing rib 10 is provided on the inner wall of the piston body 1 close to the tapered surface 9. The reinforcing rib 10 is provided to improve the structural strength of the piston body 1.

[0038] The above does not limit the technical scope of the present invention. Any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A piston used in a dispensing cylinder, characterized in that: include: A piston body, wherein the piston body is disposed in the dispensing cylinder; a coarse scraper, the coarse scraper being arranged around the outer peripheral surface of the piston body and radially protruding from the piston body; a first fine scraper, the first fine scraper being arranged around the outer circumference of the piston body and radially protruding from the piston body; wherein the radial distance between the first fine scraper and the center line of the piston body is greater than the radial distance between the coarse scraper and the center line of the piston body, so that a transition space for overflow or exhaust is formed between the coarse scraper and the first fine scraper; There are more than one first exhaust holes, and the first exhaust holes are evenly arranged on the first fine scraper.

2. The piston used in a dispensing cylinder according to claim 1, characterized in that: The first fine scraper is arranged adjacent to the coarse scraper.

3. The piston used in a dispensing cylinder according to claim 2, characterized in that: The first fine scraper and the coarse scraper are an integrated structure.

4. The piston for use in a dispensing cartridge according to claim 1, characterized in that: It includes a second scraper, which is arranged around the outer peripheral surface of the piston body. The second scraper is spaced apart from the first fine scraper. There is a gap between the second scraper and the dispensing cylinder to discharge the gas through the first exhaust hole.

5. The piston used in a dispensing cylinder according to claim 4, characterized in that: It includes a third fine scraper, which is arranged around the outer peripheral surface of the piston body. The third fine scraper is arranged on the side of the second scraper away from the first fine scraper. Second exhaust holes are evenly arranged on the third fine scraper; the second exhaust holes discharge the gas passing through the second scraper.

6. The piston used in a dispensing cylinder according to claim 5, characterized in that: The front end of the piston body is a tapered surface, and the first fine scraper extends obliquely toward the direction away from the tapered surface.

7. The piston used in a dispensing cylinder according to claim 6, characterized in that: An extending direction of the second scraper is the same as an extending direction of the first fine scraper.

8. The piston used in a dispensing cylinder according to claim 7, characterized in that: The extending direction of the third fine scraper is the same as the extending direction of the first fine scraper.

9. The piston used in a dispensing cylinder according to claim 6, characterized in that: The piston body is a hollow structure, and a reinforcing rib is provided on the inner wall of the piston body close to the tapered surface.

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