JP2007054787A - Head for discharge gun - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head for a discharge gun capable of reducing the wasteful use of an adhesive to the utmost. <P>SOLUTION: A separating plate part 18 extending inside a nozzle 20 and partitioning the inside of the base end side into a first and a second spare chamber 22, 23 is provided in the tip part of a partition part 13 for separating a first and a second discharge port 14, 15 from each other. The length of the separating plate part 18 is set to equal to or above the discharge distance of a base resin and a curing agent discharged respectively to the first and the second spare chamber 22, 23 during a period from starting discharge of the base resin having low viscosity to the fist spare chamber 22 till discharging the base resin and the curing agent to the first and the second spare chamber 22, 23 by a fixed quantity, respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a head used for a discharge gun, and more particularly to a discharge gun head used for a two-component discharge gun.

  In general, when a two-component adhesive is discharged to a desired location using a two-component discharge gun, two cartridges each containing a main agent and a curing agent are attached to the discharge gun head, and a nozzle is attached to the head. Install. Thereafter, the head, the nozzle, and the two cartridges are attached to a predetermined attachment portion of the discharge gun. When the lever of the discharge gun is pulled in this state, the two pistons of the discharge gun move forward and push each cartridge forward. Then, the main agent and the curing agent are pushed out from each cartridge. The main agent and the curing agent pushed out from each cartridge are discharged from the head into the nozzle. The main agent and the curing agent discharged into the nozzle are mixed in the nozzle to become an adhesive, and are discharged from the tip of the nozzle.

  The head used in the two-component discharge gun has a head body as described in Patent Document 1 below. The head body has first and second mounting portions to which two cartridges are respectively attached, and first and second discharge ports respectively communicating with the first and second mounting portions through first and second passages. Is formed. The first and second discharge ports are both cylindrical and are arranged concentrically. Usually, the 2nd discharge port is arrange | positioned inside the 1st discharge port. The base end portion of the nozzle is screwed and fixed to the outer periphery of the second discharge port. Therefore, the main agent and the curing agent respectively discharged from the first and second discharge ports flow into the nozzle. And after mixing in the inside of a nozzle and becoming an adhesive agent, it discharges to a desired site | part from the front-end | tip part of a nozzle.

  Some discharge guns are provided with first and second discharge ports in the discharge gun itself as described in Patent Document 2 below. In this discharge gun, the second discharge port protrudes forward from the first discharge port by a predetermined distance. This is for preventing the main agent and the hardener leaking from the first and second discharge ports from being mixed and solidified when the discharge gun is not used, and the first discharge port of the second discharge port. The amount of protrusion from is relatively short.

Design registration No. 1242381 JP 62-91261 A

  The conventional discharge gun head has a problem that the discharged adhesive must be discarded after the start of the discharge of the adhesive until a predetermined amount of the adhesive is discharged. That is, the main agent and the curing agent have different viscosities. Usually, the viscosity of the main agent is lower than the viscosity of the curing agent. For this reason, when two cartridges are simultaneously pushed at the same speed by two pistons, only the main agent having a low viscosity is first discharged into the nozzle. Therefore, the adhesive at the beginning of ejection hardly contains a curing agent in the main agent and cannot be used as an adhesive. Thereafter, as each piston continues to push each cartridge, the main agent continues to be discharged by a certain amount. On the other hand, a hardener with high viscosity is not discharged to the nozzle until the amount of movement of the piston (the amount of crushing of the cartridge by the piston) reaches a predetermined amount. The curing agent is discharged to the nozzle. Accordingly, the adhesive at this point is unsuitable for use as an adhesive because the amount of the curing agent mixed with the main agent is excessive. After the amount of crushing of the cartridge by each piston reaches a predetermined amount, the main agent and the curing agent are each discharged by a predetermined amount, and the mixing ratio of the main agent and the curing agent becomes a predetermined ratio. The adhesive discharged from the nozzle between the start of discharging the main agent and the mixing ratio reaching a predetermined ratio is unsuitable for use and must be discarded.

In order to solve the above problems, the present invention includes a head main body, and the head main body includes first and second mounting portions on which the first and second cartridges are detachably mounted, and a partition wall portion. The first and second discharge ports arranged adjacent to each other, the first and second mounting portions, and the first and second discharge ports communicate with each other to discharge from the first and second cartridges. In the discharge gun head provided with the first and second passages for allowing the first and second fluid contents to flow to the first and second discharge ports, the tip of the partition wall has the first 1. Separation wall portions projecting forward from the opening ends of the second discharge ports are provided, and the protruding amount of the separation wall portions from the opening ends of the first and second discharge ports is the first. The first and second flows after the fluid substance starts to be discharged from one of the second discharge ports. The first and second fluid substances are set to be longer than the flow distance that flows forward from the first and second ejection ports until the discharge amount of the active substance becomes constant. .
In this case, the partition wall portion is formed in a flat plate shape, the first and second discharge ports are disposed on both sides in the thickness direction of the partition wall portion, the separation wall portion is formed in a flat plate shape, and the partition wall portion and It is desirable that they are integrally formed on the same plane.

  According to the present invention having the above-described characteristic configuration, the first and second fluid substances are discharged from the first and second discharge ports by a predetermined amount and then mixed with each other across the separation wall portion. . Accordingly, the first and second fluid substances are mixed at a predetermined ratio from the beginning of mixing. Therefore, it is possible to reduce or eliminate the amount of a mixture such as an adhesive that must be discarded.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 to 5 show a first embodiment of the present invention. The discharge gun head 1 of this embodiment has a head main body 2 and a nozzle 20 as shown in FIG. The head body 2 is formed by molding a resin, and has a large diameter portion 3, a small diameter portion 4, and a connecting portion 5 as shown in FIGS. 1 to 5. The large-diameter portion 3 and the small-diameter portion 4 each have a disk shape, and are arranged on the same plane in a state where the axes are parallel to each other. The large diameter portion 3 has a larger diameter than the small diameter portion 4. Instead of the large diameter part 3 and the small diameter part 4, two disk parts having the same outer diameter may be used. The connecting portion 5 is provided across the adjacent side portions of the large diameter portion 3 and the small diameter portion 4. Thereby, the large diameter part 3 and the small diameter part 4 are integrated via the connection part 5.

  A first mounting portion 6 is provided on the back surface of the large diameter portion 3. The first mounting portion 6 has a first annular protrusion 7 and a first insertion tube portion 8. The first annular protrusion 7 is formed in an annular shape on the back surface of the large diameter portion 3 along the outer peripheral portion thereof, and is arranged concentrically with the large diameter portion 3. The first plug-in cylinder portion 8 has a circular cross section and is arranged concentrically with the large diameter portion 3.

  A second mounting portion 9 is provided on the back surface of the small diameter portion 4. The second mounting portion 9 has a second annular protruding portion 10 and a second insertion tube portion 11. The second annular projecting portion 10 is formed in an annular shape on the back surface of the small diameter portion 4 along the outer peripheral portion thereof, and is disposed concentrically with the inside of the small diameter portion 4. The second plug-in cylinder part 11 has a circular cross section and is arranged concentrically with the small diameter part 4. The inner and outer diameters of the second insertion cylinder part 11 are smaller than the inner and outer diameters of the first insertion cylinder part 8.

  A discharge cylinder portion 12 is provided on the front surface of the head body 2. The discharge cylinder portion 12 is disposed so as to straddle adjacent side portions of the large diameter portion 3 and the small diameter portion 4. Therefore, the discharge cylinder portion 12 also functions as a connecting portion for connecting the large diameter portion 3 and the small diameter portion 4. The discharge cylinder portion 12 is disposed in parallel with the large diameter portion 3 and the small diameter portion 4.

  As shown in FIG. 5, a partition wall portion 13 is provided inside the discharge cylinder portion 12. The partition wall 13 has a flat plate shape and is disposed on the center line of the discharge cylinder 12. The distal end surface of the partition wall 13 is positioned on the same plane as the distal end surface of the discharge cylinder 12. The inside of the discharge cylinder part 12 is divided into two equal parts by the partition part 13 into a part on the large diameter part 3 side and a part on the small diameter part 4 side. The partition wall portion 13 is shifted from the position where the inside of the discharge cylinder portion 12 is equally divided to the small diameter portion 4 side, whereby the cross-sectional area of the portion on the large diameter portion 3 side inside the discharge cylinder portion 12 is reduced to the small diameter portion 4 side. You may make it larger than the cross-sectional area of a part.

  A first discharge port 14 is constituted by the half on the large diameter portion 3 side of the discharge cylinder portion 12 and the partition wall portion 13, and a second discharge port 15 is formed by the half on the small diameter portion 4 side of the discharge cylinder portion 12 and the partition wall portion 13. Is formed. The first discharge port 14 communicates with the inside of the first insertion tube portion 8 through a first passage 16 formed in the head body 2. The second discharge port 15 communicates with the inside of the second insertion tube portion 11 via a second passage 17 formed inside the head body 2. The total internal volume of each of the first insertion cylinder part 8, the first passage 16 and the first discharge port 14 is the internal volume of each of the second insertion cylinder part 11, the second passage 17 and the second discharge port 15. It is larger than the total internal volume of the container by the ratio of the outer diameter of the large diameter portion 3 and the small diameter portion 4 (the ratio of the inner diameters of the barrels A1 and B1 of the cartridges A and B described later).

  A separation plate portion (separation wall portion) 18 is integrally provided at the distal end portion of the partition wall portion 13. The proximal end portion of the separation plate portion 18 has the same shape and the same dimensions as the distal end portion of the partition wall portion 13 and is disposed on the same plane. That is, the separation plate portion 18 extends forward from the distal end portion of the partition wall portion 13 and protrudes from the distal end surface of the discharge cylinder portion 12 by the length. The length of the separation plate portion 18 (the amount of protrusion from the distal end surface of the discharge cylinder portion 12) will be described later.

  As shown in FIG. 5, the nozzle 20 is detachably attached to the head body 2. That is, a male screw portion 12a is formed in the middle portion of the outer peripheral surface of the discharge cylinder portion 12, and a cap nut 19 is screwed and fixed to the male screw portion 12a. The base end portion of the nozzle 20 is fixed to the distal end portion of the discharge cylinder portion 12 by the cap nut 19. In this case, the nozzle portion 20 is fixed in a state of being fitted to the outer peripheral surface of the distal end portion of the discharge cylinder portion 12. Therefore, the inside of the nozzle portion 20 communicates with both the first and second discharge ports 14 and 15. A well-known mixing member 21 is inserted in a portion on the tip side from the first and second discharge ports 14 and 15 inside the nozzle portion 20.

  A separation plate portion 18 is inserted into the inside of the proximal end side of the nozzle portion 20. Both side surfaces of the separation plate portion 18 are in liquid-tight contact with the inner peripheral surface of the nozzle portion 20. Thereby, the inside of the base end side of the nozzle part 20 is divided into the 1st preliminary chamber 22 and the 2nd preliminary chamber 23. The first preliminary chamber 22 communicates with the inside of the first discharge port 14, and the second preliminary chamber 23 communicates with the inside of the second discharge port 15. The mixing member 21 is in contact with the front end surface of the separation plate portion 18, but the mixing member 21 may be separated from the separation plate portion 18.

  Next, a case where the two-component adhesive is discharged from the tip opening portion of the nozzle portion 20 using the discharge gun head 1 having the above-described configuration and a protruding amount of the separation plate portion 18 will be described.

  As shown in FIG. 6, cartridges A and B are detachably mounted on the first and second mounting portions 6 and 7 of the head 1, respectively. The cartridge A contains the main agent (first fluid substance), and includes a flexible barrel A1 made of a film, a hard bottom A2 that closes the base end opening of the barrel A1, and the barrel A1. And a hard lid A3 that closes the tip opening. The trunk portion A1 is formed in a tapered shape so as to slightly increase in diameter from the proximal end toward the distal end. Of course, it may be formed in a straight cylindrical shape. A discharge hole A4 is provided at the center of the lid A3. The discharge hole A4 is closed by a seal A5 provided on the inner end face of the lid A3. The cartridge B accommodates a curing agent (second fluid substance), and includes a body B1, a bottom B2, a lid B3 having a discharge hole B4, and a seal B5. Each part of the cartridge B has a smaller diameter than the diameter of each corresponding part of the cartridge A by the ratio of the diameter of the first annular protrusion 7 and the second annular protrusion 10. It is comprised similarly to each part of.

  The cartridge A is detachably mounted on the first mounting portion 6 in a state where the lid portion A3 is abutted against the first annular projecting portion 7. At this time, the first insertion tube portion 8 of the first mounting portion 6 is inserted and fitted into the discharge hole A4, and the tip portion of the first insertion tube portion 8 breaks the seal A5. Therefore, when the cartridge A is mounted on the first mounting portion 6, the inside of the first insertion tube portion 8 communicates with the inside of the cartridge A. Similarly, the cartridge B is detachably mounted on the second mounting portion 9. Therefore, the inside of the second insertion cylinder portion 11 of the second mounting portion 9 communicates with the inside of the cartridge B.

  On the outside of the cartridge A, a guide cylinder G1 is extrapolated. The guide cylinder G1 is made of a hard resin and has a predetermined rigidity. The outer diameter of the guide tube G1 is set to be substantially the same as the outer diameter of the distal end portion of the body portion A1. One end surface of the guide tube G1 is abutted against the first annular protrusion 7. The other end portion of the guide tube G1 extends beyond the bottom portion A2, and a push piece K1 is slidably press-fitted therein. On the outside of the cartridge B, the guide cylinder G2 is externally inserted in the same manner as when the guide cylinder G1 is externally inserted into the cartridge A. A push piece K2 is slidably inserted into the other end of the guide tube G2.

  The head 1, the nozzle 20, the cartridges A and B, and the guide cylinders G1 and G2 are detachably mounted on the mounting portion T1 of the discharge gun T in an assembled state. In this case, the head 1, the nozzle 20, the cartridges A and B, and the guide cylinders G1 and G2 are moved forward by the front surfaces of the large diameter portion 3 and the small diameter portion 4 of the head 1 being abutted against the stopper portion T2 of the mounting portion T1. Movement to is blocked. Therefore, when the push pieces K1, K2 are pushed forward by the pistons T3, T4 of the discharge gun T, the bottom parts A2, B2 of the cartridges A, B are pushed forward at the same speed by the push pieces K1, K2, respectively. Portions A1 and B1 are crushed. As a result, the main agent contained in the cartridge A is discharged into the first preliminary chamber 22 of the nozzle 20 through the first insertion tube portion 8, the first passage 16 and the first discharge port 14, and into the cartridge B. The stored curing agent is discharged into the second preliminary chamber 23 of the nozzle 20 through the second insertion cylinder part 11, the second passage 17 and the second discharge port 15.

  Since the main agent contained in the cartridge A has a lower viscosity than the viscosity of the curing agent, the main agent is discharged into the first preliminary chamber 22 almost at the same time as the barrel A1 starts to be crushed. And after that, the fixed amount of main agent according to the speed of piston T3 is discharged. On the other hand, since the viscosity of the curing agent accommodated in the cartridge B is higher than the viscosity of the main agent, the main agent is discharged into the first auxiliary chamber 22 with a slight delay after being discharged into the first auxiliary chamber 22. Discharged. Moreover, a large amount of curing agent is discharged at the beginning of discharge. Thereafter, a certain amount of curing agent according to the speed of the piston T4 (= speed of the piston T3) is discharged. The main agent and the curing agent are different from each other in the discharge mode from the start of the discharge of the main agent into the first preliminary chamber 22 until the discharge amount of both becomes constant, but the hardener having a high viscosity is discharged by a certain amount. When this happens, the leading end of the main agent discharged into the first preliminary chamber 22 and the leading end of the curing agent discharged into the second preliminary chamber 23 are the leading end surfaces (first and first) of the discharge cylinder portion 12. The two discharge ports 14 and 15 are located at positions separated from each other by the same discharge distance. Here, the length of the separation plate portion 18, that is, the length from the distal end surface of the discharge cylinder portion 12 to the distal end surface of the separation plate portion 18 is set to be equal to or greater than the discharge distance. Therefore, when the main agent and the curing agent flow into the nozzle 20 in front of the first and second preliminary chambers 22 and 23, both flow in a certain amount. Therefore, the main agent and the curing agent are mixed at a predetermined ratio (= the ratio of the inner diameters of the body portions A1 and B1) from the beginning of mixing in the nozzle 20.

  Next, another embodiment of the present invention will be described. In the following embodiment, only the configuration different from the above-described embodiment will be described, and the same components are denoted by the same reference numerals and description thereof will be omitted.

  FIG. 7 shows a second embodiment of the present invention. In this embodiment, the separation plate portion 18 is formed separately from the partition wall portion 13, and the base end surface of the separation plate portion 18 is pressed against the distal end surface of the partition wall portion 13. The separation plate portion 18 is formed not only separately from the head 1 but also separately from both the nozzle 20 and the mixing member 21. The separation plate portion 18 is preferably formed integrally with the mixing member 21.

  FIG. 8 shows a third embodiment of the present invention. In this embodiment, the partition wall 13 is formed separately from the head body 2. Of course, both side surfaces of the partition wall portion 13 are in liquid-tight contact with the inner peripheral surface of the discharge cylinder portion 12 and the inner wall surfaces defining the first and second passages 16 and 17, and the base end surfaces are the first and second passages 16 and 16. It is in liquid-tight contact with the inner wall surface that divides 17. The separation plate portion 18 is formed integrally with the partition wall portion 13.

  FIG. 9 shows a fourth embodiment of the present invention. In this embodiment, instead of the flat partition wall 13, a cylindrical partition wall 13 ′ is used. The partition wall 13 ′ is disposed concentrically with the inside of the discharge cylinder 12. A ring-shaped space surrounded by the discharge cylinder portion 12 and the partition wall portion 13 ′ communicates with the first passage 16, and the inside of the partition wall portion 13 ′ communicates with the second passage 17. Therefore, in this embodiment, the first discharge port 14 is configured by the discharge cylinder portion 12, the partition wall portion 13 ', and the space between them, and the second discharge port 15 is configured by the partition wall portion 13' and the internal space thereof. ing.

  Further, a separation cylinder portion (separation wall portion) 18 ′ is used instead of the separation plate portion 18 of the above embodiment. The separation cylinder portion 18 'has the same cross-sectional shape as the partition wall portion 13', and is formed integrally and concentrically with the distal end portion of the partition wall portion 13 '. Separation cylinder part 18 'may be formed in a different cross-sectional shape from partition part 13'. A space between the inner peripheral surface of the nozzle 20 and the outer peripheral surface of the separation cylinder portion 18 ′ is a first preliminary chamber 22, and an internal space of the separation cylinder portion 18 ′ is a second preliminary chamber 23.

It is a front view which shows the head main body used in 1st Embodiment of this invention. It is a rear view of the head body. It is a side view of the head body. It is a bottom view of the head body. It is an expanded sectional view which follows the XX line of FIG. 1 which abbreviate | omits and shows a part of 1st Embodiment of this invention. It is a top view which shows the principal part of the discharge gun using the discharge gun head of the embodiment. It is sectional drawing similar to FIG. 5 which abbreviate | omits and shows a part of 2nd Embodiment of this invention. It is sectional drawing similar to FIG. 5 which abbreviate | omits and shows a part of 3rd Embodiment of this invention. It is sectional drawing similar to FIG. 5 which shows abbreviate | omitting a part of 4th Embodiment of this invention.

Explanation of symbols

A Cartridge B Cartridge T Discharge gun 1 Discharge gun head 2 Head body 6 First mounting portion 9 Second mounting portion 13 Partition portion 13 ′ Partition portion 14 First discharge port 15 Second discharge port 16 First channel 17 Second channel 18 Separation plate (separation wall)
18 'separation cylinder (separation wall)
20 Nozzle 22 First spare chamber 23 Second spare chamber

Claims (2)

The head main body includes a first and second mounting portion on which the first and second cartridges are detachably mounted, and first and second cartridges disposed adjacent to each other via a partition wall portion. 2 discharge ports, the first and second mounting portions and the first and second discharge ports are respectively communicated, and the first and second fluid contents discharged from the first and second cartridges are In the discharge gun head provided with the first and second passages flowing to the first and second discharge ports,
Separation wall portions projecting forward from the opening ends of the first and second discharge ports are provided at the front end portions of the partition wall portions, and the first and second discharge ports of the separation wall portions are provided. The amount of protrusion from the opening end until the discharge amount of the first and second fluid substances becomes constant after the fluid substance starts to be discharged from one of the first and second discharge ports. A discharge gun head characterized in that the first and second fluid substances are set longer than a flow distance in which the first and second fluid substances flow forward from the first and second discharge ports. The partition wall is formed in a flat plate shape, the first and second discharge ports are arranged on both sides in the thickness direction of the partition wall portion, the separation wall is formed in a flat plate shape, and is flush with the partition wall portion. The discharge gun head according to claim 1, wherein the discharge gun head is formed integrally with the discharge gun head.

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