JP5044141B2 - Center misalignment prevention device - Google Patents

Description

  The present invention relates to a misalignment prevention device in a painting apparatus provided with a needle valve used in a painting apparatus.

  2. Description of the Related Art Conventionally, a painting apparatus incorporating a nozzle provided with a needle valve has been used to coat a member such as an outer wall material (see, for example, Patent Document 1).

  A conventional coating apparatus is shown in FIG. In this coating apparatus, a support member 93 is fixed to a base 92 having a spray nozzle 91, and a bracket 95 having a solenoid 94 is fixed to the support member 93. The nozzle 91 opens and closes the spray port 96 by reciprocating in the axial direction of the needle 97 of the needle valve. The needle 97 has its upper end fixed to the movable iron core 98 of the solenoid 94, and the movable iron core 98. The reciprocating motion of the needle 97 is the reciprocating motion of the needle 97 as it is.

  By the way, in the coating apparatus provided with the nozzle 91 having such a needle valve, it is difficult to align the axis of the movable iron core 98 and the axis of the needle 97, and misalignment is likely to occur. . When misalignment occurs, the friction increases, the movement does not go smoothly and the desired opening / closing control cannot be performed, the solenoid 94 is overburdened and burned, or the paint flow rate variation or leakage occurs. Or a problem occurs.

Therefore, as a measure against misalignment, it is conceivable to interpose a member such as a rocker arm / cam so that the misalignment does not become a problem. The transmission structure becomes complicated and the number of parts increases, resulting in an increase in failure factors.
JP 2002-192021 A

  The present invention has been made in view of the above points, and an object of the present invention is to provide a misalignment prevention device that can prevent misalignment of a needle valve with a simple configuration. It is.

In order to solve the above problem, in the invention according to claim 1, the needle 31 is attached to the movable iron core 21 of the solenoid 2, and the tip of the needle 31 is formed in the nozzle 10 by the reciprocating movement of the movable iron core 21. The center misalignment prevention device 4 of the coating apparatus 1 that opens and closes the flow path of the nozzle 10 by being separated from and contacting the sheet portion 32, and has a pair of inner wall surfaces (51a, 52a) having a cavity 50 therein and facing each other. ) Form a box-like body 5 which is a plane parallel to each other, and the diameter of the shaft portion 32 of the needle 31 is formed on the side wall 51 having one inner wall surface 51a of the pair of inner wall surfaces of the cavity 50 of the box-like body 5. A through hole 54 having a larger diameter than the inner wall surface 52a of the cavity 50 of the box-shaped body 5 and having the other inner wall surface 52a of the pair of inner wall surfaces is perpendicular to the reciprocating direction. The needle is fixed to the movable iron core 21 1 is formed with a large portion 33 larger than the diameter of the insertion hole 54 of the box-shaped body 5 and accommodated in the cavity 50 of the box-shaped body 5, and one surface of the large portion 33 of the needle 31. The needle tip side surface 33a is a receiving surface 61 and the surface 33b opposite to the receiving surface 61 is a contact surface 62 that contacts one inner wall surface 51a of the cavity 50 of the box-like body 5; A receiving portion insertion hole 54 through which the shaft portion 32 of the needle 31 is inserted through the substantially central portion of the receiving surface 61 and the contact surface 62 is formed, and the cavity 50 of the contact surface 62 and the box-shaped body 5 is formed. A gap is formed between the inner wall surface 51a of the cavity 50 and the inner wall surface 51a of the cavity 50 so as to move along the inner wall surface 51a when the inner wall surface 51a is accommodated in or opposed to the inner wall surface 51a. The first receiving member 6 is formed, and one surface is an enormous portion of the needle 31 3 is a receiving surface 71 that receives a surface 33b opposite to the needle tip side, and a surface 33b opposite to the receiving surface 71 is a contact surface 72 that contacts the other inner wall surface 52a of the box-shaped body 5; When the abutting surface 72 and the other inner wall surface 52a of the cavity 50 of the box-shaped body 5 are in contact with or face each other, they move in the cavity 50 along the inner wall surface 52a. A second receiving member 7 in which a gap to be obtained is formed between the inner wall surface of the cavity 50 is formed, and the enlarged portion 33 of the needle 31, the first receiving member 6 and the second receiving member 7 are connected to the needle. The first receiving member 6 is brought into contact with the shaft portion 32 of the box 31 inserted into the insertion hole 54 of the box-like body 5 and the receiving portion insertion hole 54 of the first receiving member 6 and accommodated in the cavity 50. Between the surface 62 and one inner wall surface 51a of the box-shaped body 5, It is characterized in that it is formed in such a size that gaps S ₁ and S ₂ can be formed between the other inner wall surface 52a of the box-shaped body 5.

As a result, the friction between the needle 31 and the nozzle 10 increases, the movement does not go smoothly and the desired opening / closing control cannot be performed, the solenoid 2 is overloaded and burned, or the flow rate of the paint The occurrence of problems such as variations and leakage of the occurrence of such a problem can be prevented , and in particular, by providing the first receiving member 6 and the second receiving member 7, an enormous portion It becomes possible to absorb the movement of 33 smoothly.

  In the present invention, the friction between the needle and the nozzle is increased by a simple configuration that does not take an arrangement space to solve the problem caused by the misalignment by interposing a member such as a rocker arm and a cam. , The movement does not go smoothly and the opening / closing control cannot be performed as expected, the solenoid is overburdened and burned, or the flow rate of the paint varies or leaks. Can be prevented.

  An embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a nozzle having a needle valve is provided at a spray port of a coating apparatus. First, the coating apparatus will be described.

  As shown in FIG. 2, the coating apparatus 1 includes a main body 11 having a nozzle 10, a lower frame 12 fixed to the base, an upper frame 13 fixed to the lower frame 12, and fixed to the upper frame 13. The main body is composed of the solenoid 2 that is provided, and further includes the misalignment prevention device 4 of the present invention.

  A nozzle 10 for ejecting paint is formed in the main body 11, and the nozzle 10 has a needle valve 3, which will be described.

  The main body 11 has a through hole 11a penetrating vertically in a substantially central portion in plan view, and the needle 31 (see FIG. 8) of the needle valve 3 is inserted into the through hole 11a. A seat portion 32 is formed at the lower portion of 11a by narrowing the lower end portion so that the inner wall surface of the lower end portion is the slope of the tip portion of the needle 31 (in this embodiment, the spherical curved surface of the lower end portion of the needle 31). The nozzle 10 is attached, and the needle valve 3 is constituted by the needle 31 and the seat portion 32. A paint inflow path 16 is connected in the middle of the through hole 11 a, and the paint flowing into the through hole 11 a from the paint inflow path 16 flows downward through the through hole 11 a toward the lower side from the jet outlet 10 a at the lower end of the nozzle 10. Is ejected. In addition, a seal member 15 made of, for example, an O-ring through which the needle 31 is inserted is provided above the portion of the through hole 11a to which the paint inflow path 16 is connected, and the paint that has flowed into the through hole 11a. It does not leak from the upper opening of the through hole 11a. An air supply path 17 is formed around the lower end of the nozzle 10 and an air inflow path 18 is connected to the air supply path 17 so that atomized air is supplied.

  A lower frame 12 protruding upward is connected to or fixed to the main body 11 at the side end, and the upper frame 13 is fixed to the lower frame 12. The upper frame 13 includes a vertical fixing piece 13a and a horizontal adjustment piece 13b. The vertical fixing piece 13a has a lower end portion fixed to the lower frame 12 with a bolt or the like. The horizontal adjustment piece 13b is fixed so as to protrude in the horizontal direction from the upper end portion of the vertical fixing piece 13a. By adjusting the adjustment screw 14, the fixing position to the vertical fixing piece 13a can be adjusted in the vertical direction. It has become. The solenoid 2 is fixed to the front end side of the horizontal adjustment piece 13b.

  The solenoid 2 is installed so that the movable iron core 21 reciprocates linearly up and down, and a needle 31 is fixed to the lower end portion of the movable iron core 21 via a misalignment prevention device 4 described later. . The solenoid 2 is disposed such that the needle 31 fixed to the movable iron core 21 overlaps the sheet portion 32 of the nozzle 10 of the main body portion 11 in plan view. The needle 31 is provided with the misalignment prevention device 4 of the present invention, which will be described later.

  The above-described coating apparatus 1 operates the solenoid 2 so that the spherical inclined surfaces of the lower end portions of the movable iron core 21 and the needle 31 are spaced upward from the sheet portion 32 at the lower end of the nozzle 10, thereby ejecting the lower end of the nozzle 10. The outlet 10a is opened to allow the paint to be ejected from the ejection port 10a, and the tip of the lower end of the needle 31 is moved downward and brought into contact with the sheet portion 32 at the lower end of the nozzle 10 to thereby eject the lower end of the nozzle 10. The outlet 10a is closed to stop the spray of paint from the outlet 10a.

  In the present invention, the misalignment prevention device 4 is provided so that misalignment does not occur between the core of the needle 31 and the core of the seat portion 32 (the core of the jet port 10a of the nozzle 10). The misalignment prevention device 4 is mainly composed of the box-shaped body 5 and the enormous portion 33 formed at the proximal end portion of the needle 31. The box-shaped body 5 has a hollow 50 inside, and is formed by drilling an insertion hole 54 having a diameter larger than the diameter of the shaft portion 32 of the needle 31 and smaller than the diameter of the enormous portion 33 in one side wall 51. The side wall 52 opposite to the one side wall 51 of the box-like body 5 is fixed to the movable iron core 21. The enormous portion 33 is larger than the insertion hole 54 so as not to fall off from the insertion hole 54 when accommodated in the cavity 50 of the box-shaped body 5, and is 0.2 to between the inner wall surface of the cavity 50. A gap of 1.0 mm is formed and formed into a size and shape that can move in the cavity 50, and in this embodiment, it is formed in a spherical shape.

  In the present embodiment, the box-like body 5 has a substantially cylindrical box shape that is split into two vertically, and the upper box-like body 5 is shown in FIG. 3 and the lower box-like body 5 is shown in FIG. FIG. 1 shows one box-like body 5 formed by screwing the upper box-like body 5 and the lower box-like body 5 together. The box-like body 5 has a pair of inner wall surfaces 51a, 52a facing each other in the inner cavity 50 as planes parallel to each other, and the insertion hole is formed in the side wall 51 having one inner wall surface 51a of the pair of inner wall surfaces. The side wall 52 having the other inner wall surface 52a of the pair of inner wall surfaces of the cavity 50 of the box-shaped body 5 is formed so that the inner wall surface 52a is perpendicular to the reciprocating direction of the movable iron core 21. It is fixed to the movable iron core 21. Here, a protruding shaft portion 55 in which a male screw 55 a is formed protrudes from the side wall 52, and the male screw 55 a is screwed and fixed to a female screw formed in the lower end portion of the movable iron core 21.

  In the present embodiment, the first receiving member 6 and the second receiving member 7 that receive the enormous portion 33 in the cavity 50 are provided.

As shown in FIG. 5, the first receiving member 6 has one surface serving as a receiving surface 61 that receives the needle 33 side surface 33 a of the enlarged portion 33 of the needle 31, and a surface 33 b opposite to the receiving surface 61. This is a contact surface 62 that comes into contact with one inner wall surface 51 a of the cavity 50 of the box-shaped body 5, and the shaft portion 32 of the needle 31 is inserted in a direction passing through the receiving surface 61 and the contact surface 62. A receiving portion insertion hole 60 having a diameter larger than the diameter of the shaft portion 32 and smaller than the diameter of the enormous portion 33 is formed. The first receiving member 6 has a contact surface 62 and one inner wall surface 51a of the cavity 50 of the box-shaped body 5 in contact with or opposed to each other, and the receiving surface 61 and the surface on the needle tip side of the enormous portion 33. Although 33a and is housed in a cavity 50 in a state of abutment or counter, this time, adjacent to one of the inner wall surface 51a of the clearance S ₃ a cavity 50 which can move along one inner wall surface 51a of the cavity 50 Dimensional shape is formed between the side surfaces to be formed. However, it is formed larger than the insertion hole 54 so as not to drop out of the insertion hole 54 of the box-shaped body 5. The receiving surface 61 is the same as the spherical surface of the bulge portion 33 to receive the bulge portion 33 of the spherical needle 31 or a spherical surface having a diameter of +3 to 10%.

As shown in FIG. 6, one surface of the second receiving member 7 is a receiving surface 71 that receives a surface 33 b opposite to the needle tip side of the enlarged portion 33 of the needle 31, and is opposite to the receiving surface 71. The surface 33b becomes a contact surface 72 that contacts the other inner wall surface 52a of the box-shaped body 5. The second receiving member 7 has the contact surface 72 and the other inner wall surface 52a of the cavity 50 of the box-shaped body 5 in contact with or opposed to each other. 33 a and the opposite surface 33 b are accommodated in the cavity 50 in a state where they abut or face each other. At this time, the gap S ₄ that can move along the other inner wall surface 52 a of the cavity 50 is the other side of the cavity 50. Dimensional shape is formed between the side wall adjacent to the inner wall surface 52a. The receiving surface 71 is a conical surface for receiving the enormous portion 33 of the spherical needle 31.

As shown in FIG. 1, FIG. 7, etc., the first receiving member 6 and the second receiving member 7 are connected to the shaft portion 32 of the needle 31 through the insertion hole 54 of the box-shaped body 5 and the first receiving member 6. A gap S ₁ is formed between the contact surface 62 of the first receiving member 6 and one inner wall surface 51 a of the box-like body 5 in a state of being inserted into the receiving portion insertion hole 60 and accommodated in the cavity 50. is, the gap S ₂ is formed between the second receiving other inner wall surface 52a of the abutment surface 72 and the box-shaped body 5 of the member 7, further receiving surface 61 and the needle 31 of the first receiving member 6 A gap is also formed between the needle 33 side surface 33a of the enlarged portion 33 and the receiving surface 71 of the second receiving member 7 and the surface 33b opposite to the needle tip side of the enlarged portion 33 of the needle 31. Dimensional shape that can be made. Moreover, although the box-shaped body 5, the 1st receiving member 6, and the 2nd receiving member 7 are manufactured with metal materials, such as SUS, you may form a receiving member with a synthetic resin. By providing such a receiving member, it is possible to absorb the movement of the enormous portion 33 smoothly.

The operation of the misalignment prevention device 4 will be described. In order to eject paint from the nozzle 10, the needle 31 is raised and the needle valve 3 is opened. In this case, the movable iron core 21 and the box-like body 5 of the solenoid 2 are raised, The enormous portion 33 of the needle 31 is raised by the side wall 51 through the first receiving member 6. At this time, even if a misalignment occurs between the movable iron core 21 and the nozzle 10, the enormous portion 33 of the needle 31 and the first receiving member 6 receiving the enormous portion 33 are connected to the movable iron core 21. because can move along the side walls 51, 52 have a gap S ₃ is formed between the side wall adjacent to the side walls 51, 52 in the cavity 50 of the box-shaped body 5 which is fixed, the misalignment is absorbed It will be. Further, when closing the needle valve 3 to stop the ejection of paint from the nozzle 10, the movable iron core 21 and the box-like body 5 of the solenoid 2 are lowered, and the second receiving member is formed by the side wall 52 of the box-like body 5. 7, the enormous portion 33 of the needle 31 is lowered. At this time, even if a misalignment occurs between the movable iron core 21 and the nozzle 10, the enormous portion 33 of the needle 31 and the second receiving member 7 receiving the enormous portion 33 are connected to the movable iron core 21. because can move along the side walls 51, 52 have a gap S ₃ is formed between the side wall adjacent to the side walls 51, 52 in the cavity 50 of the box-shaped body 5 which is fixed, the misalignment is absorbed It will be.

  Furthermore, even when the center axis of the movable iron core 21 and the center axis of the nozzle 10 are not only misaligned but also tilted (not parallel), the spherical enlarging part 33 of the needle 31 is the enormous part. 33 is received by a receiving surface 61 of the first receiving member 6 having a spherical surface that is the same as or slightly larger than the spherical surface, and a receiving surface 71 of the second receiving member 7 having a conical surface. The diameters of the insertion hole 54 of the box-like body 5 through which the portion 32 is inserted and the receiving portion insertion hole 60 of the first receiving member 6 are formed larger than the shaft portion 32, so that the inclination of the needle 31 is not hindered. The enormous portion 33 can be received, and such a tilt can be absorbed.

  As a result, as in the case of trying to solve the problem caused by misalignment by interposing members such as rocker arms and cams, a layout space is required and the power transmission structure becomes complicated and the number of parts increases, resulting in a failure factor. The friction between the needle 31 and the nozzle 10 increases due to a simple configuration without taking up a layout space, and the opening / closing control cannot be performed as expected without smooth movement. Thus, it is possible to prevent the solenoid 2 from being burned due to an excessive load, or the occurrence of problems such as variations in the flow rate of paint or leakage.

It is sectional drawing which shows the structure of the principal part of one Embodiment of this invention. A coating apparatus is shown, (a) is a whole side view, (b) is an expanded sectional view of the part which provided the nozzle. It is a sectional side view of an upper box-shaped object. The lower box-shaped body is shown, (a) is a plan view, and (b) is a side sectional view. It is a sectional side view of a 1st receiving member. It is a sectional side view of a 2nd receiving member. (A) is the perspective view seen from the bottom which shows the accommodation state of an upper box-shaped body and a 2nd receiving member, (b) shows the accommodation state of a lower box-shaped body and a 1st receiving member. It is the perspective view seen from the top. It is a sectional side view of a needle. It is sectional drawing of the conventional coating apparatus.

Explanation of symbols

2 Solenoid 21 Movable iron core 31 Needle 32 Shaft portion 33 Excessive portion 4 Center misalignment prevention device 5 Box-shaped body 50 Cavity 51 Side wall 51a Inner wall surface 52 Side wall 52a Inner wall surface 54 Insertion hole 55 Protruding shaft portion 6 First receiving member 60 Part insertion hole 61 Receiving surface 62 Abutting surface 7 Second receiving member 71 Receiving surface 72 Abutting surface S ₁ gap S ₂ gap S ₃ gap S ₄ gap

Claims (1)

  This is a center misalignment prevention device for a coating device that opens and closes the nozzle flow path by attaching a needle to the movable iron core of the solenoid and moving the tip of the needle away from the sheet formed on the nozzle by reciprocating the movable iron core. There,
Forming a box-like body having a hollow inside and a pair of opposing inner wall surfaces that are parallel to each other, the side wall having one inner wall surface of the pair of inner wall surfaces of the cavity of the box-like body An insertion hole having a diameter larger than the diameter of the shaft portion of the needle is drilled, and the inner wall surface of the side wall having the other inner wall surface of the pair of inner wall surfaces of the box-shaped body is perpendicular to the reciprocating direction. Fixed to the movable iron core so that
Forming a huge portion that is larger than the diameter of the insertion hole of the box-like body and accommodated in the cavity of the box-like body at the base end portion of the needle;
One surface serves as a receiving surface for receiving the needle tip side surface of the enormous portion of the needle, and the surface opposite to the receiving surface serves as a contact surface that contacts one inner wall surface of the cavity of the box-shaped body, and A receiving portion insertion hole through which the shaft portion of the needle is inserted through the substantially central portion of the receiving surface and the contact surface is formed, and the contact surface and one inner wall surface of the cavity of the box-shaped body are in contact with each other. Forming a first receiving member in which a gap that can move along the inner wall surface in the cavity when accommodated in the cavity in a state of contact or facing is formed between the inner wall surface of the cavity;
One surface is a receiving surface that receives a surface opposite to the needle tip side of the enormous portion of the needle, and a surface opposite to the receiving surface is a contact surface that contacts the other inner wall surface of the box-shaped body, and When the abutting surface and the other inner wall surface of the cavity of the box-shaped body are in contact with or face each other, a gap that can move along the inner wall surface in the cavity is a gap between the abutting surface and the inner wall surface of the cavity. Forming a second receiving member formed between
The enormous portion of the needle, the first receiving member, and the second receiving member are inserted into the cavity by inserting the shaft portion of the needle through the insertion hole of the box-like body and the receiving portion insertion hole of the first receiving member. In the accommodated state, between the contact surface of the first receiving member and one inner wall surface of the box-shaped body, between the contact surface of the second receiving member and the other inner wall surface of the box-shaped body, An apparatus for preventing misalignment, characterized in that it is formed in a dimension that can produce a gap.

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