JP2603461B2 - Pressure water feeder for water injection loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention relates to a device for feeding pressurized water for weft insertion in a water jet loom, and more particularly, from a pump that performs suction and discharge in synchronization with a loom. The present invention relates to a device for supplying pressurized water to an inlet nozzle, in which an elastic body is charged with a suction operation of a pump, and a discharge operation is performed by the stored elastic body.

<Prior Art> Such a conventional apparatus is disclosed in, for example,
There is one disclosed in Japanese Patent Application Laid-Open Publication No. H10-210, which will be described with reference to FIG.

In FIG. 1, reference numeral 1 denotes a pump drive cam which rotates in the direction of arrow R in synchronization with the loom, and has a spiral cam surface 1a and a cam top 1b at the end thereof. Reference numeral 2 denotes a rocker capable of swinging about a fixed shaft 3. Reference numeral 4 denotes a cam follower supported at one end of the rocker 2, and reference numeral 5 denotes a link rod connected to the other end of the rocker 2. A mounting rod 6 is connected to the end, and a coil spring 8 as an elastic body is elastically mounted between a head 6a of the mounting rod 6 and a spring receiver 7 fixed to a frame of the loom. With this configuration, the cam follower 4 can be elastically contacted with the cam surface 1a.

10 is a plunger pump, 11 is its plunger, 12 is a suction valve, 13 is its valve ball, 14 is a valve spring for urging this valve ball in the closing direction, 15 is a discharge valve, 13 'is its valve ball, 14 'is a valve spring for urging the valve ball in the valve closing direction.

Reference numeral 16 denotes an L-shaped lever whose corner is supported on a fixed shaft 17, one end of which is connected to the end of the link rod 5, and the other end of which is connected to the plunger 11 via a connecting rod 18.

According to the above configuration, when the cam 1 rotates in the direction of the arrow R, the rocker 2 rotates clockwise in the figure, so that the plunger 11 is pulled up via the link rod 5, the L-shaped lever 16, the connecting rod 18, and the like. The weft insertion water stored in the water level tank 19 is sucked into the pump 10 via the suction valve 12. At the same time, the coil spring 8 is elastically compressed by the mounting rod 6 and stored. Next, when the cam top 1b passes through the cam follower 4, the rocker arm 2 is released from the restraint from the cam surface 1a and becomes free, so that the plunger 11 is driven by the stored coil spring 8 and descends while the suction The weft insertion water is pressurized and discharged through the discharge valve 15 and the water channel 20.
Send to 21. Therefore, the weft insertion nozzle 21 starts to jet the water to start pulling the weft yarn W, and immediately thereafter, the gripper 22 is opened to perform the weft insertion.

<Problems to be Solved by the Invention> By the way, such a conventional apparatus can be used, for example, at 1,00
When the high-speed weaving is performed 0 or more times, the water jetted from the weft insertion nozzle 21 scatters violently and collides with the warp yarn, thereby causing a problem such as warp fluff. The cause was found to be the following.

FIG. 4 shows the result of measuring the feed water pressure by mounting a pressure sensor 23 (see FIG. 3) in the water channel 20 immediately before the weft insertion nozzle 21, and the horizontal axis represents the time t (or the crank angle of the loom). α), the vertical axis is the hydraulic pressure p.

In the figure, t ₀ is the beginning of the discharge stroke, i.e. when the cam follower 4 is out of the cam top 1b, water pressure up to the time t ₁ the coil spring 8, which is the energy-storing from this point to initiate extension Rises from p ₀ to p ₁ . This water pressure is peak
After exhibiting p ₂ (t ₂ ), the pressure gradually decreases to the time point t ₃ at which the extension of the coil spring 8 ends, and reaches the water pressure p ₃ , where the discharge stroke of the pump 10 ends. During this time, weft insertion water is jetted from the weft insertion nozzle 21 at a flow rate corresponding to the above water pressure change. Note that during time t ₃ -t ₄ in injection period after weft insertion water based on inertial, pressure rapidly falls from the discharge stroke of the pump 10 is terminated. As shown in the figure, the water pressure curve has pulsation, which is mainly caused by the fluttering of the valve ball 13 or 13 '.

From the above results, the dispersion of the injection water, the time t ₀ -t with the high-speed jet water in the period from the time point t ₁ -t ₃ on the low-speed jet of water to collision of between ₁ result to be Oshinokeyo this, the former It can be interpreted as a phenomenon in which the low-speed water flow explosively collapses.In the high-speed loom, the effective water injection period t ₁ -t ₃ must be shortened, and the water pressure p must be increased because it is necessary to insert the required length of weft during that time. Therefore, the difference in the flow velocity of the jet at the weft insertion nozzle 21 increases, and the collapse phenomenon occurs violently.

The reason why the water pressure does not rise so rapidly in the early stage of the injection is that the rise is gradual at the start of the suction stroke, so that the valve ball 13 'of the discharge valve 15 can be strongly sucked and closed. , Weft insertion nozzle by the dance of valve ball 13 '
It is considered that the turbulence in the nozzle 21 at the initial stage of the injection is increased by slightly sucking water from the 21 side to reduce the residual water in the nozzle 21.

In view of such a point, the present invention completely prevents the suction of water from the weft insertion nozzle side in the suction stroke, thereby obtaining a steep rise of the water pressure at the start of the discharge stroke and hence at the beginning of the injection, and The purpose of the present invention is to prevent the explosive collapse phenomenon from occurring.

<Means for Solving the Problems> For this reason, the present invention provides an on-off valve between a discharge valve provided on the discharge side of the pump and a weft insertion nozzle, and synchronizes the on-off valve with a loom. A valve drive device for driving the pump is provided, and the on-off valve is closed near the end of the discharge stroke of the pump to prevent water from being sucked in from the weft insertion nozzle side. The operation timing of the valve driving device is set so that the on-off valve is opened at a constant opening until the wetting nozzle is supplied with pressurized water.

<Operation> In the above configuration, the opening / closing valve between the discharge valve and the weft insertion nozzle provided on the discharge side of the pump is closed during the suction operation of the pump, so that the water passage between the discharge valve and the weft insertion nozzle is forced. It is possible to prevent the water from being sucked in from the nozzle side. For this reason, in the early stage of the injection when the discharge stroke is started, the water pressure is supplied to the weft insertion nozzle with a sharp rise in the water pressure. Therefore, although there is a slight transition period in the weft insertion nozzle, a high-speed inertial flow can be obtained from the beginning, so that the collapse phenomenon of the preceding water flow can be made extremely small, thereby preventing splashing of the jet water. .

<Example> An example of the present invention will be described below.

In FIG. 1, reference numeral 30 denotes a pump, reference numeral 20 denotes a water passage extending from the pump 30 to the weft insertion nozzle 21, reference numeral 60 denotes an opening / closing valve interposed in the water passage 20, and reference numeral 80 denotes a valve driving device for driving the opening / closing valve 60.

The operating principle of the pump 30 is substantially the same as that of the conventional pump 10, but the illustrated one has a more practical configuration. In this pump 30, 31 is a housing, 32 is a water passage penetrating the inside of the housing 31, and 33 is a water passage 32
The pump chamber 33 is mostly formed inside a sleeve 34 screwed to the housing 31. 35
Is a plunger, a cylindrical main body 35a having one end closed.
And a plunger head 35b protruding from one end thereof
And an outer flange 35c formed at the other end.
5a is externally fitted to the sleeve. Reference numeral 36 denotes a spring case, which is formed in a cylindrical shape having an annular bottom cover 36a at one end, and the outer periphery of the cylindrical portion is screwed (37) to the housing 31 to thereby form a plunger 35.
Of the main body 35a. 38 is a lock nut for positioning the spring case 36. Reference numeral 39 denotes a coil spring as an elastic body, which is elastically interposed between the annular bottom cover 36a of the spring case 36 and the outer flange 35c of the plunger 35.

Reference numeral 40 denotes a suction valve formed at one end of the water passage 32, which comprises a valve seat 41 attached to the mouth of the passage, a valve ball 42 disposed behind the valve seat 41, and a housing 43 having a water passage 43a. 41
The side is connected to the constant water tank 19. Reference numeral 44 denotes a discharge valve formed at the other end of the water passage 32. The constituent elements of the discharge valve 44 are the same as those of the suction valve 40, and the same reference numerals are used. This housing
The water passage 43a '43' is connected to the water passage 20.

Reference numeral 50 denotes a pump drive cam that rotates clockwise (in the direction of arrow R) in synchronization with the loom, and O denotes a center of rotation thereof. The cam 50
In the counterclockwise direction, the bottom cam surface 50a having the same distance from the rotation center O, the spiral cam surface 50b having the same distance gradually increasing, the top cam surface 50c having the same distance being equal, and the end of the top cam surface 50c and the bottom cam surface A straight cam surface 50d that connects the start end of 50a substantially linearly is provided continuously, and θ _a , θ _b , θ _c and θ _{d are provided.}
Are rotation angles respectively corresponding to these cam surfaces 50a, 50b, 50c and 50d.

51 is an L-shaped rocker supporting the corner portion on a fixed shaft 52,
53 is a cam follower which is supported on one end of the rocker 51 and corresponds to the pump drive cam 50; 54 is a connecting rod connecting the other end of the rocker 51 to the plunger head 35b; 51a is the other end of the rocker 51 Arm.
Reference numeral 55 denotes a stroke adjuster for the plunger 35, which includes a stopper bolt 56 and a lock nut 57, and the stopper bolt 56 is fixedly arranged to face the arm 51a.

The configuration of the pump 30 is as described above, and the following adjustment is made. That is, since the resilient coil spring 39 pulls up the plunger 35 and urges the rocker 51 clockwise to press the cam follower 53 against the pump driving cam 50, the stopper bolt 56 is first screwed into the arm 51a. The cam follower 53 is adjusted so that the cam follower 53 just contacts the bottom cam surface 50a while pressing the rocker 51 counterclockwise through, or faces the bottom cam surface 50a through a small gap, and the position is fixed using the lock nut 57. Next, the spring case 36 is advanced and retracted by the screw portion 37 to apply a required set load to the coil spring 39, and is fixed by the lock nut 38 in this state. The set load is determined corresponding to the water pressure p _{3 at the} end of the discharge stroke (FIG. 4).

A diagram P shown in FIG. 2 illustrates the lift of the plunger 35. In the figure, the horizontal axis represents the crank angle α of the loom with respect to the beating time as a reference (0 °), and the weft insertion period of the loom, that is, the opening period of the gripper 22, is denoted by α in FIG. = (110 ° to 250 °).

Now, with the rotation of the pump driving cam 50, the cam follower
When 53 moves from the bottom cam surface 50a to the spiral cam surface 50b,
At this time (α = 240 °), the range of rotation angle θb (α = 240 °)
8080 °). At this time, as will be described later, the small radius cam surface 81a of the cam 81 and the cam follower 84 have already contacted, and the on-off valve 60 is closed. That is, the rocker 51 moves through the cam follower 53 and the spiral cam surface 50b.
As the plunger 35 is pulled down while being pushed counterclockwise, the weft insertion water in the constant level tank 19 is pushed and opened by the suction valve 40 to be sucked into the pump chamber 33, and the coil spring 39 is simultaneously compressed. It is energized. Of course, the discharge valve 44 is closed by the suction force. The end of the suction stroke S (α = 80
), The cam follower 53 moves onto the top cam surface 50c, from which the range of the rotation angle θc (α = 80 ° to 100 °)
In the rocker 51 is stopped, whereby since the plunger 35 is resting, the first rest stroke R _1. Next, when the top cam surface 50c passes through the cam follower 53, the rocker 5
Since the restriction of 1 is released, the stored coil spring 39 rapidly pushes out the plunger 35 to discharge the suction water in the pump chamber 33. In this discharge stroke E, the arm 51a is
6 ends (α = 200 °), and the rotation angle during that period is approximately θd. Then, since Botomukamu surface 50a causes the rest of the rocker 51 in contact with or opposed to the cam follower 53, the second rest stroke R _2, and the next time the suction stroke S from the end of the rest stroke R ₂ (α = 240 °) Move on.

Next, in the on-off valve 60, reference numeral 61 denotes a valve case having a through hole 62. A sleeve 63 is fitted near the front end (the right end in the figure) of the through hole 62, and is positioned by being brought into contact with the step 62 a of the through hole 62, and then fixed by a holding nut 64. 65 is the inlet of the discharge water of the pump 30, 66 is this inlet 65
A water supply passage 67 surrounding the sleeve 63 in communication with the water supply passage 67 connects the water supply passage 66 to the inside of the sleeve 63. 68 is an outlet connected to the weft insertion nozzle 21, 69 is a delivery water passage communicating with the outlet 68 and surrounding the sleeve 63, and 70 is a plurality of outlets communicating the delivery water passage 69 with the inside of the sleeve 63. It is a valve hole. Reference numeral 71 denotes a spool valve, which is fitted on the sleeve 63 by two lands 71a and 71b formed on the spool valve, protrudes a valve shaft 71c forward, and a front end thereof is a valve head 71d.
There is. Numeral 72 denotes a valve spring for pressing the spool valve 71 forward, and numeral 73 denotes a washer for the valve spring 72. The spool valve 71 is moved to two front and rear positions by the valve spring 72 and the valve driving device 80. In the advanced position shown, the valve hole 70 is
In the retracted position, the valve hole 70 is closed by the land 71a.
And 71b, the positions of these lands 71a, 71b are determined so as to communicate with the water supply passage 67.

In the valve driving device 80, reference numeral 81 denotes a valve driving cam which rotates clockwise (in the direction of arrow R) in synchronization with the loom, and O 'denotes the center of rotation. Reference numeral 82 denotes a V-shaped lever whose corner is supported on a fixed shaft 83, which is disposed between the valve drive cam 81 and the spool valve 71 and supports a cam follower 84 at a free end on the cam 81 side.
A projection 85 is fixed to the free end of the spool valve 71 so as to face the valve head 71d. Reference numeral 86 denotes a spring for urging the lever 82 to rotate toward the valve driving cam 81.The spring 86 causes the cam follower 84 to resiliently contact the cam 81, and the protrusion 85 causes the valve head 71d of the spool valve 71 to move. Take it.

In the valve drive cam 81, 81a and 81b in a small radius cam surface and the large radial cam surface formed on the range of the rotation angle theta ₁ and theta _2, respectively, each the center is the rotational center O '. Opening cam surface and the closing cam surface, respectively 81c and 81d and connects a small radius cam surface 81a and the large radius cam surface 81b, theta ₃ and theta
Reference numeral ₄ denotes a rotation angle of each of the cam surfaces 81c and 81d.

The diagram EV shown in FIG. 2 illustrates the operation timing of the valve driving device 80.

While the small-radius cam surface 81a is in contact with the cam follower 84 (rotation angle θ ₁ ), the spool valve 71 is at the limit of forward movement and the on-off valve 60 is closed as described above. The start of the valve closing period (θ ₁ ) is α = 210 °, and the end thereof is α = 70 °. Here, when the cam follower 84 moves on the valve opening cam surface 81c, the lever 82 rotates counterclockwise to drive the spool valve 71 to the retreat limit and fully open the on-off valve 60. This valve opening operation period (θ ₃ )
Is set to α = 90 °. From this end, the cam follower 84 moves to the large-radius cam surface 81b, and the open / close valve 60 is kept fully open. The end of the valve opening period (θ ₂ ) is set to α = 190 °, and when the cam follower 84 moves onto the valve closing cam surface 81d, the lever 82 is driven clockwise from the valve spring 72 via the spool valve 71. After the elapse of the valve closing operation period (θ ₄ ), the start point of the small radius cam surface 81a is reached, where the spool valve 71 reaches the forward limit and the on-off valve 60 is fully closed.

That is, in this embodiment, before the suction operation of the plunger 35 subsequent to the discharge stroke E of the pump 30 as described above, the water passage 20 between the pump 30 and the weft insertion nozzle 21 is mechanically closed, and the water passage 20 is closed. The inertial flow of the water inside is forcibly turned off. Therefore, the flow of water is cut off,
The outflow of water in 21 can be minimized.

Then, prior to the next discharge stroke, the on-off valve 60 is opened, so that the pressurized water is discharged from the nozzle 21 immediately during the discharge stroke to perform weft insertion.

During the discharge stroke, since water remains in the weft insertion nozzle 21, the turbulence of the water flow is not large as described above, so that a steep rise in water pressure can be obtained.

The closing operation of the on-off valve 60 is performed by the discharge stroke E of the pump 30.
It is good to do it at the same time as the end of or about 10 ° after the end. Ten
If it is more than °, it seems that water flows out as in the past. Further, the opening timing of the on-off valve 60 may be performed immediately after the start of the discharge stroke.

Further, in the present embodiment, an automatic ball valve similar to the conventional type is used as the suction valve 40, but instead of this suction valve, a forcible opening / closing valve device similar to the on-off valve 60 and its valve driving device 80 is used. be able to.

The diagram SV shown in FIG. 2 shows an example of the operation timing of this case, theta ₅ is closed the suction inlet side closing valve (fully closed)
The periods θ ₆ and θ ₇ are a valve closing operation period and a valve opening operation period of the valve, respectively, and as shown in the same diagram, these operation periods θ
By setting ₆ and θ ₇ in the first and second resting steps R ₁ and R ₂ , the behavior of the intake water is stabilized.

Further, an electromagnetic actuator that operates in synchronization with the loom can be used as the valve driving device.

<Effects of the Invention> As described above, according to the present invention, pressure water is jetted from the weft insertion nozzle by performing a discharging operation by the stored elastic body, so that the elastic force of the elastic body is set. It can be easily set to a desired high pressure value and is suitable for a high-speed loom.

The present invention presupposes such a method, and provides an open / close valve that positively opens and closes between a discharge valve provided on the discharge side of the pump and the weft insertion nozzle. During the suction operation of the pump, the water path between the discharge valve and the weft insertion nozzle is forcibly shut off even if water is to be sucked in from the weft insertion nozzle side due to the valve ball of the discharge valve fluttering during the suction operation of the pump. Thus, it is possible to prevent water from being sucked from the weft insertion nozzle side. Further, since the opening and closing valve is opened at a constant opening from before the start of the discharge stroke to near the end of the discharge stroke in the pump, the injection timing at which the discharge stroke by the stored elastic body is started,
The on-off valve is opened at a constant opening degree, and the on-off valve exhibits a steep rise in water pressure without supplying resistance to the pressurized water and is sent to the weft insertion nozzle. Therefore, since a high-speed jet is obtained from the beginning, the increase in the flow velocity difference of the jet at the weft insertion nozzle is suppressed, and the collapse phenomenon of the preceding water stream can be made extremely small, thereby preventing the scattering of the jet water. Therefore, there is no problem such as warp fluff caused by scattered water colliding with the warp, and weft insertion for pulling the weft is not scattered, so that weft insertion can be performed reliably, eliminating problems in high-speed looms. be able to.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is an operation characteristic diagram of the above embodiment, FIG. 3 is a configuration diagram showing a conventional example, and FIG. 4 is a characteristic diagram of feed water pressure. 20 ... water channel, 21 ... weft insertion nozzle, 30 ... pump, 35 ...
... Plunger, 39 ... Coil spring, 50 ... Pump drive cam, 60 ... Open / close valve, 71 ... Spool valve, 80 ... Valve drive device, 81 ... Valve drive cam

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-51-67454 (JP, A) JP-A-62-28443 (JP, A) JP-A-60-39443 (JP, A) JP-A 60-39443 88155 (JP, A)

Claims (1)

(57) [Claims] A pump (30) that performs suction and discharge in synchronization with a loom from a discharge valve (4) provided on the discharge side of the pump (30).
This is a device for supplying pressurized water to the weft insertion nozzle (21) via 4), and accumulates energy in the elastic body (39) with the suction operation of the pump (30). A discharge valve (44) provided on the discharge side of the pump (30) and a weft insertion nozzle (21) in which pressure water is injected from the weft insertion nozzle (21) by performing a discharge operation by the body (39). And a valve driving device (80) for driving the on-off valve (60) in synchronization with the loom, and in the vicinity of the end of the discharge stroke of the pump (30). Closes the on-off valve (60) to prevent water from being sucked in from the weft insertion nozzle (21), and opens the on-off valve (60) at a constant opening from before the discharge stroke starts to near the end of the discharge stroke. The valve drive device (80) is set to operate in such a way that the valve can be supplied and pressurized water can be supplied to the weft insertion nozzle (21). Pressure water feeders in water jet loom.