CN101724955A - Shedding mechanism for air jet loom - Google Patents

Abstract

The invention relates to a shedding mechanism for an air jet loom. The mechanism comprises a left crank, a left connecting rod, a right crank, a right connecting rod, an oscillating bar and a sliding block arranged on the oscillating bar, wherein the left crank is provided with the A end and the B end, the A end is hinged on a machine frame, and the B end is hinged with one end of the left connecting rod; the right crank is provided with the C end and the D end, the C end is hinged on the machine frame, the D end is hinged with one end of the right connecting rod, the other end of the left connecting rod and the right connecting rod is correspondingly hinged with both ends of the oscillating bar respectively; a straight line passing the A end of the left crank and the C end of the right crank is defined as the X axis, the central point of a connecting line of the A end and the B end is defined as the base point O, and a straight lien passing the O point and vertical to the X axis is defined as the Y axis; and when the left and the right cranks rotate, the sliding block slides along the direction of the Y axis. Two sets of crank connecting rod mechanisms jointly drive the oscillating bar, and the relationship of the geometrical dimensions of all rods is controlled to ensure that the shedding mechanism keeps low oscillation while carrying out the shedding motion.

Description

The shedding mechanism of air-jet loom

Technical field

The present invention relates to a kind of shedding mechanism that is applied on the air-jet loom.

Background technology

Air-jet loom utilizes shedding mechanism to carry out the harness motion of warp thread, and shedding mechanism is finished the alternately lifting of levels warp thread.Used cam shedding mechanism and connecting rod shedding mechanism on the loom, the vibration of these mechanisms is big, constitute the stressed big of rod member in the past.The rotating speed of loom had only 100-200 rev/min usually in the past, and the rotating speed of present air-jet loom reaches 900-1000 rev/min, existing low speed shedding mechanism is just finished motion, when high-speed cruising, can produce very big nothing firmly, cause the vibration of rod member big, existing shedding mechanism causes the fracture of warp thread, so can not satisfy the needs of present air-jet loom.

Summary of the invention

The object of the invention is exactly the shedding mechanism that a kind of air-jet loom will be provided, and it can reduce the dynamic force and the moment of rod member.

Technical scheme of the present invention provides a kind of shedding mechanism of air-jet loom, and it mainly comprises left crank, left connecting rod, right crank, right connecting rod and fork, and left crank has side a and b, and its A end is hinged on the frame, and its B end is hinged with an end of left connecting rod; Right crank has C end and D end, and its C end is hinged on the frame, and an end of its D end and right connecting rod is hinged, and the other end of left connecting rod and the other end of right connecting rod are hinged accordingly with the two ends of fork respectively.That is to say that this shedding mechanism has left and right two toggles, by fork of the common driving of two toggles, the rotation of left crank and right crank is converted into moving of fork by left connecting rod, right connecting rod respectively.The straight line that to hold through the C of the A of left crank end and right crank is defined as X-axis, the mid point of the line between the side a and b is defined as initial point O, be defined as Y-axis through the O point and perpendicular to the straight line of X-axis, fork is provided with slide block, when left crank and the rotation of right crank, slide block slides along Y direction, and promptly fork is along the Y direction translation.The projected length of fork on X-axis is defined as 2m, and then left crank whenever turns over angle Φ around the A end points, and m satisfies following equation:

${(X1-m-\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="H2009101864842E0000011.png"\; state="\{\{state\}\}">R</figure-callout>}1*\cos \mathrm{\&Phi;})}^2-{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="H2009101864842E0000011.png"\; state="\{\{state\}\}">L</figure-callout>}1}^2+{(\sqrt{{L2}^2-{(m-\mathrm{<figure-callout\; id="1"\; label="X"\; filenames="H2009101864842E0000011.png"\; state="\{\{state\}\}">X</figure-callout>}1+R2*\cos \mathrm{\&Phi;})}^2}-2\sqrt{{X1}^2-m^2}-R2*\sin \mathrm{\&Phi;}+R1*\sin \mathrm{\&Phi;})}^2=0,$

Wherein, X1 is the length of O point to the A end of left crank, and R1 is the length of left crank, and R2 is the length of right crank, and L1 is the length of left connecting rod, and L2 is the length of right connecting rod.This shedding mechanism can use a spot of rod member to go to realize action, and the satisfied above stressed degree of equational each rod member of physical dimension is little, and the moment of generation is little, can reduce the vibration that the loom harness motion causes.

In a kind of embodiment of optimization, the mid point of fork is positioned on the Y-axis, and slide block is positioned at the medium position of fork, further to reduce the vibration of rod member.

Further, left crank whenever turns over angle Φ around the A point, and right crank just turns over angle Φ in the opposite direction around the C point.Left side crank and right crank are done synchronous rotation with rotating speed in the opposite direction, more can reduce dynamic force and dynamic force moment.

Preferably, the length of fork is preferably the twice of O point to the length X 1 of the A end of left crank, to reduce dynamic force and moment as far as possible.

Ideally, the length R1 of left crank is greater than the length R2 of right crank, and the length R1 of left crank is less than the length R2 of right crank, and the length of promptly left crank and right crank is unequal, to be suitable for finishing the specific action of air-jet loom opening.

The present invention compared with prior art, has following advantage: the common fork that drives of two cover crank connecting rods about employing, and by appropriate design to the physical dimension of each motion rod member, make this shedding mechanism guarantee low vibration when carrying out the specific action of loom opening, to be fit to the actual demand of high-speed air-jet looms.

Description of drawings

Accompanying drawing 1 is the structural representation according to shedding mechanism of the invention process;

Wherein: 11, left crank; 12, left connecting rod;

21, right crank; 22, right connecting rod;

3, fork; 4, slide block.

The specific embodiment

On air-jet loom, shedding mechanism is used to carry out the harness motion of warp thread, the present invention is from promoting the technological requirement of warp thread, realize the opening action with few rod member of trying one's best, make every effort on rod member, not produce as far as possible extra power and moment simultaneously, mainly on the physical dimension of each motion rod member, consider, a kind of plane shedding mechanism that meets the actual conditions of present high-speed air-jet looms is provided.Below in conjunction with specific embodiment content of the present invention is explained in detail.

Referring to plane shedding mechanism shown in Figure 1, this shedding mechanism mainly is made of left crank 11, right crank 21, left connecting rod 12, right connecting rod 22, fork 3 and slide block 4, the A end of left side crank 11 is hinged on the frame, B holds hinged left connecting rod 12, the C end of right crank 21 is hinged on the frame, and D holds hinged right connecting rod 22, and fork 3 is connected between left connecting rod 12 and the right connecting rod 22, and allow left connecting rod 12 can distinguish relative to the two ends of fork 3 with right connecting rod 22 and rotate, slide block 4 is arranged on the fork 3.A left side crank 11 and right crank 21 provide power to rotate by driving mechanism, and move at the two ends that drive fork 3 of the transmission by left connecting rod 12 and right connecting rod 22 respectively." left side " herein and " right side " show with reference to the drawing of Fig. 1 and define.

Fig. 1 adopts the mode of reference axis to come more clearly to represent correlation between each rod member, and the straight line of ordering through A point and B is an X-axis, and the mid point of the line between A point and the B point is initial point O, and Y-axis is passes through the O point and perpendicular to the straight line of X-axis.In the moving process of fork 3, slide block 4 slides along Y-axis, and the absolute value of the E end of fork 3 and F end displacement on Y direction equates.

The size of each rod member of more than addressing should satisfy following equation:

${(X1-m-\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="H2009101864842E0000011.png"\; state="\{\{state\}\}">R</figure-callout>}1*\cos \mathrm{\&Phi;})}^2-{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="H2009101864842E0000011.png"\; state="\{\{state\}\}">L</figure-callout>}1}^2+{(\sqrt{{L2}^2-{(m-\mathrm{<figure-callout\; id="1"\; label="X"\; filenames="H2009101864842E0000011.png"\; state="\{\{state\}\}">X</figure-callout>}1+R2*\cos \mathrm{\&Phi;})}^2}-2\sqrt{{X1}^2-m^2}-R2*\sin \mathrm{\&Phi;}+R1*\sin \mathrm{\&Phi;})}^2=0,$

Wherein, X1 represents the length of O point to the A end of left crank 11, m represents half of the projected length of fork 3 on X-axis, and R1 represents the length of left crank 11, the line segment length that B point just shown in Figure 1 is ordered to A, R2 represents the length of right crank 21, the line segment length that D point just shown in Figure 1 is ordered to C, L1 represents the length of left connecting rod 12, the line segment length that E point just shown in Figure 1 is ordered to B, L2 represents the length of right connecting rod 22, the line segment length that F point just shown in Figure 1 is ordered to D.This equation is unknown number with m, corresponding to each corner Φ, in conjunction with each rod member size of determining, can draw a m value that satisfies above equation.

And in the given value of aforesaid equation, in general, the value of R1 and R2 is unequal, that is to say that the length of the length of left crank 11 and right crank 21 is unequal, certainly, the length of left side crank 11 can be longer than the length of right crank 21, the length of the right relatively crank 21 of length that also can left crank 11 is shorter, and in the embodiment shown in fig. 1, the length of left crank 11 is just short slightly than the length of right crank 21.

And satisfy the m value of aforesaid equation, and also be that the setting angle of fork 3 relative X-axis is reasonable, fork 3 is held at its E end when Y-axis is swung and F can not rocked.

Specifically, left crank 11 and right crank 21 can be done synchronous rotation in the opposite direction, and will reach the purpose that reduces dynamic force moment as far as possible, and the rotational angle value of left crank 11 should preferably equate with the rotational angle value of right crank 21.As shown in Figure 1, left crank 11 turns over angle Φ clockwise around the A point, and 21 on right crank turns over angle Φ counterclockwise around the C point.

The mid point G of fork 3 preferably is on the Y-axis, and slide block 4 promptly is positioned at the middle part of fork 3.The line segment length that line segment length that the E point is ordered to G and F point are ordered to G, then E to the G section of fork 3 also equates with the distance that F to G section projects on the X-axis, all equals the m value.

And, better mode is, the length of fork 3 is O points to 2 times of the length of the A end points of left crank 11, the equal in length that length that the line segment length that line segment length that to be the G point order to E and G point are ordered to F is all ordered with O point A respectively and O point are ordered to C, can know that thus the length of fork 3 in fact also equates with the distance that the A point is ordered to C.

In fact, satisfy the rod member set-up mode of above-mentioned various relations, be that left crank 11 and right crank 21 are made synchronous backward and with the rotation of rotating speed, the mid point of fork 3 is on the Y-axis, the length of fork 3 equals the distance of the A end of left crank 11 to the C end of right crank 21, so, aforesaid equation has just become an equation, that is to say, these the several rod member size relationships and the method for operation can be reduced in additional force and the moment that produces on the rod member, thereby make this shedding mechanism be able under the environment of low vibration, finish the specific action of warp on loom opening, to satisfy the demand of present high-speed air-jet looms.

More than specific embodiment of the present invention is illustrated in conjunction with diagram; but protection content of the present invention is not only limited to above embodiment, in affiliated technical field of the present invention, and the common knowledge of a GPRS; just can in its technology main idea scope, carry out diversified change.

Claims (6)

1. the shedding mechanism of an air-jet loom, it is characterized in that: it comprises left crank, left connecting rod, right crank, right connecting rod, fork, and described left crank has side a and b, and its A end is hinged on the frame, and its B end is hinged with an end of left connecting rod; Described right crank has C end and D end, its C end is hinged on the frame, its D end is hinged with an end of right connecting rod, the other end of described left connecting rod and the other end of right connecting rod are hinged accordingly with the two ends of fork respectively, the straight line that to hold through the C of the A of left crank end and right crank is defined as X-axis, the mid point of the line between the side a and b is defined as initial point O, be defined as Y-axis through the O point and perpendicular to the straight line of X-axis, described fork is provided with slide block, when left crank and the rotation of right crank, described slide block slides along Y direction, and the projected length of described fork on X-axis is defined as 2m, left side crank whenever turns over angle Φ around the A end points, and m satisfies following equation:

${(X1-m-R1*\cos \mathrm{\&Phi;})}^2-{L1}^2+{(\sqrt{{L2}^2-{(m-X1+R2*\cos \mathrm{\&Phi;})}^2}-2\sqrt{{X1}^2-m^2}-R2*\sin \mathrm{\&Phi;}+R1*\sin \mathrm{\&Phi;})}^2=0,$

Wherein, X1 is the length of O point to the A end of left crank, and R1 is the length of left crank, and R2 is the length of right crank, and L1 is the length of left connecting rod, and L2 is the length of right connecting rod.

2. shedding mechanism according to claim 1 is characterized in that: the mid point of described fork is positioned on the Y-axis, and described slide block is positioned at the medium position of fork.

3. shedding mechanism according to claim 1 is characterized in that: described left crank whenever turns over angle Φ around the A point, and described right crank just turns over angle Φ in the opposite direction around the C point.

4. shedding mechanism according to claim 1 is characterized in that: the length of described fork is the twice of O point to the length X 1 of the A end of left crank.

5. according to the described shedding mechanism of one of claim 1-4, it is characterized in that: the length R1 of described left crank is greater than the length R2. of right crank

6. according to the described shedding mechanism of one of claim 1-4, it is characterized in that: the length R1 of described left crank is less than the length R2. of right crank

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