JP3826328B2 - Nozzle mouth clog prevention device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention prevents nozzle clogging in a spray nozzle device that automatically sprays a liquid such as a chemical solution periodically or at a predetermined date and time for pest control, sterilization, humidification, deodorization, aroma, combustion, etc. it is those related to the device.
[0002]
[Prior art]
Conventionally, as this type of nozzle clogging elimination driving device, there is one disclosed in, for example, Japanese Utility Model Laid-Open No. 3-11457 (Japanese Utility Model Application No. 1-69751). Here, the clean-out rod, which is inserted through the axial center so as to freely move forward and backward, is urged by splaying elasticity to always give the outer end of the tail with the plunger attached, and the tip needle is connected to the inner end of the nozzle mouth. In the spray nozzle device that is allowed to penetrate freely and is exposed freely, an eccentric cam or a cylinder piston mechanism is provided, and the plunger is pressed by these to move the cleanout rod, thereby further moving the tip needle to the nozzle opening The drug solution clogged or solidified was pushed out and removed.
[0003]
[Problems to be solved by the invention]
In the conventional nozzle clogging elimination driving device as described above, the clogging cleaning operation can be automated by periodically driving the eccentric cam or the cylinder piston mechanism, thereby saving labor. However, there are the following problems.
(1) FIG. 8 is an explanatory view showing a mechanism for pressing the plunger 53 by the rotation of the eccentric cam 70. In this mechanism,
(A) The machining of the eccentric cam 70 is difficult and the manufacturing cost increases.
(B) The push-out dimension (stroke) with respect to the plunger 53 cannot be changed.
(C) A lateral force from the eccentric cam 70 is applied to the plunger 53, and the plunger 53 is displaced in the lateral direction, so that it comes into contact with the retainer 51 covering the plunger 53, and the contact portion is worn. Cause failure.
(2) In the mechanism that presses the plunger by the cylinder piston mechanism, a fluid control mechanism for driving the cylinder piston mechanism is required separately, which complicates the structure and inevitably increases the manufacturing cost.
[0004]
The present invention has been made to solve the above problem, the production cost consists simple structure even cheaper, also the object of subjecting Hisage a failure hardly nozzle opening clogging preventing device generating To do.
[0005]
[Means for Solving the Problems]
A nozzle port clogging prevention device according to the present invention includes a tip needle disposed in the immediate vicinity of a nozzle port, a cleanout rod that is continuous with a rear end of the tip needle and is elastically biased in a direction opposite to the nozzle port. And a plunger attached to the rear end of the clean-out rod, and a spray nozzle device having a function of eliminating clogging by pushing the plunger and penetrating the tip needle through the nozzle opening The rotation drive means and a rotation member attached to one end, the other end connected to the rotation drive means, and the rotation drive means to drive the one end around the other end. an arm end portion is rotated, are formed with an inclined portion flat portion on one side, is disposed at a position where the flat portion intersects the movement path of the rotating member of the arm, the Oblique portion is formed adjacent to the rotation direction of the arm of the flat portion, so that the crank and the other surface in contact with the plunger, the said crank its moving direction becomes the longitudinal direction of the plunger And the other end of the arm and the center position in the width direction of the crank are shifted in the width direction of the crank, and the rotation of the arm as the arm rotates. When the member presses the flat portion of the crank, the crank moves and presses the plunger, and when the rotating member comes into contact with the inclined portion of the crank, the crank is in a direction opposite to the pressing direction of the plunger. Moving.
[0007]
In the present invention, when the rotation driving means starts to rotate at a low speed, the arm rotates accordingly, and a rotating member (for example, a bearing) attached to the tip of the arm presses the crank. At this time, one surface (flat portion) of the crank is disposed at a position that intersects the movement path of the rotating member of the arm and is pressed by the rotating member. Then, the crank moves while being guided in the length direction of the pressed member by the guide member, and presses the plunger here. When a pressing force is applied to the plunger, the cleanout rod and the tip needle move against the force that is elastically biased by the cleanout rod, and the tip of the tip needle penetrates the nozzle opening, causing clogging, for example. Or remove the solidified chemical solution by pushing it out.
[0008]
When the arm rotates further and the rotating member of the arm comes into engagement with the inclined portion of the crank, the crank starts to return. In this return operation, the tip needle moves smoothly and quickly by the rotation of the inclined portion and the rotating member, so that the impact is small and the return (return) time can be shortened. In addition, when this arm is rotating, the spraying of the chemical solution from the nozzle port is also performed, and the spraying is stopped while the clogging elimination operation by the tip nozzle is performed. Thus, by shortening the return time of the tip needle, the spray stop time is also shortened, and the efficiency reduction of the spray process is suppressed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a plan view showing an arrangement example of a nozzle clogging elimination driving device and a spray nozzle device as an object thereof according to one embodiment of the present invention, and FIG. 2 is a front view thereof. In these drawings, a spray nozzle device 12 is fixedly attached to a bent and protruded side of the nozzle base 10, and a clamp 14 is disposed on the rear end side of the spray nozzle device 12. The clamp 14 is arranged so that its engagement surface is substantially orthogonal to the tangential direction of its engagement point (more precisely, the center position of the bearing 32 at the engagement position) in the movement path of the bearing 32 of the arm 18 described later. And the inclined part 14a which notched the other edge part side of the arm in the engagement surface is provided. A clamp cover 16 is attached to the nozzle base 10 so as to cover the clamp 14, and the clamp cover 16 serves as a guide member for moving the clamp 14 along the axial direction of the spray nozzle device 12. To fulfill. The clamp 14 is guided by the clamp cover 16 by the rotation of the arm 18 and moves along the moving direction (tangential direction).
[0011]
A limit switch 20 is attached to the nozzle base 10 through a spacer 22. The limit switch 20 is disposed such that the drive contact 20a is located in a position where the arm 18 is in the moving range and away from the crank 14. A synchronous motor 24 for driving the arm 18 is attached to the back side of the nozzle base 10. The synchronous motor 24 has a built-in reduction gear, and its output shaft 24a rotates at a low speed of about several revolutions / minute. The signal lines and the like of the limit switch 20 and the synchronous motor 24 are led to a control box (not shown) via the connector 28. In FIG. 2, the crank cover 16 of FIG. 1 is cut and a part of the illustration is omitted so that the crank 14 appears, and the position of the arm 18 is shown rotated 90 degrees. .
[0012]
FIG. 3 is a cross-sectional view showing details of the arm 18. As shown in the figure, the output shaft 24a of the synchronous motor 24 is fixed to one side of the cam 30, and the arm 18 is rotatably supported. Further, a bearing 32 as a rotating member is fixed to the other side of the cam 30 by a bolt member 34. At this time, the bearing 32 is arranged so that the outer peripheral portion thereof is located outside the cam 30 and the bolt member 34, and the outer peripheral portion of the bearing 32 contacts when the arm 18 presses the crank 14. become.
[0013]
FIG. 4 is a cross-sectional view showing the configuration of the spray nozzle device 12. In the figure, 41 is a nozzle body, 41a is a spraying air inlet, 41b is a liquid inlet, 42 is a liquid nozzle, 43 is a retainer ring, 44 is a gas nozzle, 45 is a gasket, 46 is a cleanout rod, and 46a is a tip. Needle 46b is a tail end, 7 is a gasket, 48 is a packing box, 49 is a packing, 50 is a packing screw, 51 is a retainer, 52 is a return stroke spring, 53 is a plunger, and 54 is a fixed block.
[0014]
In the spray nozzle device 12 of FIG. 4, first, the chemical solution reaches from the chemical solution tank (not shown) through the connecting pipe 55, the liquid inlet 41b, the nozzle hole 42a, and the nozzle port 42b. At the same time, compressed air is vigorously ejected from the gas nozzle port 44a through the annular air passage 42c through the spraying air inlet 41a through the connecting pipe 56 from the compressor (not shown). The chemical solution reaching the opening 42b is sucked out and sprayed together with the compressed air.
[0015]
FIG. 5 is a control circuit diagram of the synchronous motor 24. In the figure, the timer 62 performs a control operation for closing the contact 63 from a certain time to a certain time. The contact 63 is connected in parallel with the contact 21 of the limit switch 20, and the parallel circuit is connected in series with the cyclonus motor 24. The contact 21 of the limit switch 20 is a normally closed contact, and is opened only when the arm 18 is engaged with the drive contact 20a of the contact of the limit switch 20. For this reason, even when the contact 63 is in the open state, the contact 21 is in the closed state, so that the drive voltage is applied to the cyclonus motor 24 and it is rotated, but the arm 18 rotates. When engaged with the drive contact 20a, the contact 21 is opened at that time, the cyclonus motor 24 is stopped, and the arm 18 is held at a predetermined position. That is, the contact 21 is a normally closed contact, but the open state is maintained because the arm 18 is engaged with the drive contact 20a of the limit switch 20 when the cyclonus motor 24 is stopped. When the timer 62 controls closing of the contact 63, a control system for controlling a compressor (not shown) for driving the spray nozzle device 12 of FIG. 4 is also controlled. The illustration is omitted.
[0016]
Next, the operation of the apparatus of FIG. 1 will be described focusing on the nozzle clogging prevention apparatus. In the control circuit of FIG. 5, when the timer 62 operates to close the contact 63, a driving voltage is applied to the synchronous motor 24 to start rotational driving. As the synchronous motor 24 is driven to rotate, the arm 18 rotates in the direction of the arrow in FIG. By this pressing, the crank 14 moves while being guided by the crank cover 16 and presses the outer end of the plunger 53. By this pressing, the clean-out rod 46 integrated with the plunger 53 moves forward against the spring elasticity, and the tip needle 46a penetrates the nozzle port 42b to push out the solidified or clogged chemical liquid agent and penetrate it. .
[0017]
When the synchronous motor 24 is further rotated, the arm 18 starts to engage with the inclined portion 14a of the crank 14. When the arm 18 starts to engage with the inclined portion 14a, the crank 14 starts to return while being guided by the crank cover 16, and the tip needle 46a also moves backward from the nozzle port 42b and starts to return to the original position. The above operation is repeated until the timer 62 opens the contact 63 and the arm 18 is engaged with the contact drive unit 21a of the limit switch 20 to open the contact 21.
[0018]
By the way, when the arm 18 presses and moves the crank 14, a bearing 32 is attached to the tip of the arm 18, and this bearing 32 is engaged with the crank 14. There is no wear on both members. For this reason, the lifetime of the apparatus can be extended.
Further, the engagement surface of the clamp 14 is disposed so as to be substantially orthogonal to the tangential direction of the engagement point in the movement path of the bearing 32 of the arm 18, and the inclined portion 14 a is provided on the shaft side of the arm 18 of the crank 14. By providing, the range in which the arm 18 presses the crank 14 is regulated. In that range, almost no lateral force is applied to the crank 14, so that no adverse effect caused by the laterally acting force occurs in the case of the conventional cam drive.
Further, the rotation of the inclined surface 14a of the crank 14 and the bearing 32 causes the tip needle 46a to perform a smooth and fast return operation. For this reason, compared with the case of the conventional cam drive, there is little impact and the ratio of the stop time of spraying operation also decreases.
Furthermore, the arm 18 and the crank 14 have a simple configuration as shown in the drawing, and are simpler to process and less expensive to manufacture than the conventional cam drive.
[0019]
Further, according to the arm 18 and the crank 14 shown in FIG. 1, the movement stroke can be easily adjusted. FIG. 6 is a sectional view of the crank 14. A hole 14b is formed in the bottom of the crank 14 as shown in the figure, and a top 64 and a liner 66 are inserted into the hole 14b, and the top 64 and the liner 66 are connected by a bolt 68. By appropriately adjusting the number of the liners 66, the moving stroke of the crank 14 can be adjusted.
[0020]
Further, the arm 18 and the crank 14 shown in FIG. FIG. 7 is a plan view when the apparatus of the embodiment of FIG. 1 and the apparatus adopting the conventional cam drive are realized under the same driving conditions. As shown in the figure, in the case of the conventional cam drive (FIG. 5B), when trying to obtain the same movement stroke, the enlargement of the cam is inevitable, and the apparatus of the embodiment of FIG. Compared with (a)), the apparatus inevitably becomes larger by that amount.
[0021]
Further, in the apparatus of FIG. 1, the plunger is pressed and moved by the arm 18 and the crank 14, and the structure is simpler than the mechanism for pressing the plunger by the conventional Linda piston mechanism, and its manufacturing cost. Will inevitably be cheaper.
[Brief description of the drawings]
FIG. 1 is a plain view showing an arrangement example of a nozzle clogging preventing device and a spray nozzle device as an object thereof according to an embodiment of the present invention.
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a cross-sectional view showing details of the arm of FIG. 1;
4 is a cross-sectional view showing a configuration of the spray nozzle device of FIG. 1. FIG.
FIG. 5 is a control circuit diagram of the synchronous motor of FIG. 1;
6 is a cross-sectional view of the crank of FIG.
FIG. 7 is a plan view when the apparatus of the embodiment of FIG. 1 and the apparatus adopting the conventional cam drive are realized under the same driving conditions.
FIG. 8 is an explanatory diagram of a conventional cam mechanism.

Claims (1)

A tip needle disposed in the immediate vicinity of the nozzle port; a cleanout rod that is continuous with the rear end of the tip needle and is elastically biased in a direction opposite to the nozzle port; and attached to the rear end of the cleanout rod A spray nozzle device having a function of eliminating clogging by pushing the plunger and penetrating the tip needle through the nozzle opening,
Rotation drive means;
A rotating member attached to one end, the other end connected to the rotation driving means, and an arm whose one end side rotates around the other end by rotation driving of the rotation driving means; ,
A flat portion and an inclined portion are formed on one surface, the flat portion is disposed at a position that intersects a movement path of the rotating member of the arm, and the inclined portion is adjacent to the rotation direction side of the arm of the flat portion. A crank whose other surface abuts against the plunger;
A guide member for guiding the crank such that the moving direction thereof is the length direction of the plunger;
When the other end of the arm and the center position in the width direction of the crank are shifted in the width direction of the crank, and the rotation member presses the flat portion of the crank as the arm rotates. A nozzle opening characterized in that when the crank moves and presses the plunger, and the rotating member comes into contact with the inclined portion of the crank, the crank moves in a direction opposite to the pressing direction of the plunger. Clogging prevention device.

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