CN212505253U

CN212505253U - Cam guide rod spiral weft insertion mechanism

Info

Publication number: CN212505253U
Application number: CN202021077450.8U
Authority: CN
Inventors: 李天杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2021-02-09
Anticipated expiration: 2030-06-11

Abstract

A cam guide rod spiral weft insertion mechanism is used for solving the problems that the weft insertion mechanism on the existing rapier loom is complex in structure and large in moving amplitude of a weft insertion rapier head. It includes: the groove cam is fixedly connected with the rapier loom; the driving guide groove is rotatably arranged relative to the groove cam, and the rotation axis of the driving guide groove and the axis of the groove cam are arranged in a collinear way; the first end of the guide rod is arranged in the active guide groove in a sliding manner; the roller is rotatably arranged at the second end of the guide rod; the slide block is arranged on the rapier loom in a sliding way, and a connecting rod is arranged between the slide block and the roller; the nut is fixedly connected with the sliding block relatively, is in threaded connection with a screw rod rotatably arranged on the rapier loom, and is fixed with a rapier conveying wheel. The utility model discloses simple structure, driving chain are short, and the wefting insertion sword head range of moving about is little.

Description

Cam guide rod spiral weft insertion mechanism

Technical Field

The utility model belongs to the technical field of the rapier weaving machine technique and specifically relates to a cam guide arm spiral wefting insertion mechanism.

Background

At present, the weft insertion mechanisms of the rapier looms at home and abroad mainly comprise the following three types: (1) conjugate cam + connecting rod + gear combination's wefting insertion mechanism. The advantages are that: the law of motion of weft insertion can be selected according to the experience of designers, and the law of motion of different manufacturers and different machine types is various. The disadvantages are as follows: the mechanism is complex and large in size, wherein the conjugate cam is difficult to manufacture and high in manufacturing cost; the length of the transmission chain; the displacement of the 'weft insertion rapier head' (the distance moving from the left side or the right side of the loom to the middle part) needs to be amplified by a plurality of gears, so that the moving amplitude (uncontrolled displacement) of the 'weft insertion rapier head' is large, and the accurate connection of weft yarns is not facilitated; and generates a large impact noise. (2) And the crank block and the variable pitch screw are combined to form the weft insertion mechanism. The advantages are that: the mechanism is simple, and the transmission chain is short; the displacement of the "rapier head" is amplified without the need for a gear system. The disadvantages are as follows: because the screw is variable-pitch and is equivalent to a cylindrical cam, the processing difficulty is high and the cost is high; the nut engaged with it, which transforms into two pairs of "tiles" clamped on the threads of the screw, is similar to the small clip on the spectacle frame for clamping the nose bridge. The tile is only one finger in size, and the installation of a positioning mechanism and a lubricating mechanism is quite complicated; the most fatal problem is that the tile is in line contact with the working surface of the screw rod and is easy to wear, and then the moving amplitude of the weft insertion rapier head is gradually increased, which is not beneficial to accurate weft yarn connection; and also generates a large impact noise. (3) The space crank rocker + connecting rod + gear combination weft insertion mechanism. The advantages are that: the mechanism complexity and the transmission chain length are both between the two weft insertion mechanisms. The disadvantages are as follows: the manufacturing difficulty is high, and the cost is high; the weft insertion motion rule is single and can not be changed according to the process requirement; the displacement of the "weft insertion rapier head" is also amplified by means of a gear.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cam guide arm spiral wefting insertion mechanism for solve on the current rapier weaving machine wefting insertion mechanism structure complicated, make the degree of difficulty big, the great problem of the range of moving about of wefting insertion sword head.

The utility model provides a technical scheme that its technical problem adopted is: cam guide screw wefting insertion mechanism, characterized by, it includes:

the groove cam is fixedly connected with the rapier loom frame;

the driving guide groove is rotatably arranged relative to the groove cam, and the rotation axis of the driving guide groove and the axis of the groove cam are arranged in a collinear way;

the first end of the guide rod is arranged in the active guide groove in a sliding manner;

the roller is rotatably arranged at the second end of the guide rod;

the slide block is arranged on the rapier loom frame in a sliding way, and a connecting rod is arranged between the slide block and the roller;

the nut is fixedly connected with the sliding block relatively, is in threaded connection with a screw rod rotatably arranged on the rapier loom, and is fixed with a rapier conveying wheel.

Furthermore, the cross section of the guide rod and the inner cavity of the active guide groove are both rectangular.

Further, the roller is rotatably connected with the guide rod through a pin shaft.

Furthermore, the first end of the connecting rod is hinged with the pin shaft, and the second end of the connecting rod is hinged with the sliding block.

Further, the nut and the screw have the same pitch.

Further, the sliding block is fixedly connected with the nut.

The utility model has the advantages that: the utility model provides a cam guide arm spiral wefting insertion mechanism has following advantage: (1) the theoretical profile of the groove cam is optimally designed, so that the optimal weft insertion motion rule can be obtained; the acceleration absolute value is smaller when the weft yarns are handed over, the mechanical amplitude is small, the noise is low, and accurate weft insertion is facilitated. (2) The screw and the nut are both of equal pitch, so that the screw and the nut are easy to manufacture; when the device works, the two are in contact with each other by the spiral surface, so the service life is long; the installation and the maintenance are convenient. (3) The mechanism is simple, the transmission chain is short, the problem that the moving amplitude of the weft insertion rapier head is large in other types of weft insertion mechanisms is solved, and the weft insertion movement is accurate and reliable. (4) Is suitable for high-speed rapier loom. (5) Is suitable for the maintenance and the reconstruction of an imported rapier loom.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a partial view of FIG. 1 from direction E;

FIG. 3 is a second simplified structural diagram of the present invention;

FIG. 4 is a graph showing the acceleration motion curve of the rapier gripper according to the present invention;

FIG. 5 is the acceleration motion curve of the rapier gripper head for several weft insertion mechanisms at the same working width and the same spindle speed;

in the figure: the rapier loom comprises a groove cam 1, a driving guide groove 2, a guide rod 3, a roller 4, a connecting rod 5, a sliding block 6, a nut 7, a screw rod 8, a pin shaft 9, a rapier driving wheel 10, a rapier tape 11 and a rapier loom head 12.

Detailed Description

As shown in fig. 1 to fig. 3, the present invention mainly includes a groove cam 1, a driving guide groove 2, a guide rod 3, a roller 4, a connecting rod 5, a slider 6, a nut 7 and a screw 8, and the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 3, a groove cam 1 is a prior art, the groove cam is fixedly installed on a frame of a rapier loom, and an active guide slot 2 is rotatably connected with the frame of the rapier loom or the groove cam, so that the active guide slot can rotate relative to the frame of the rapier loom and the groove cam, and an axis of the active guide slot rotating around the frame of the rapier loom is collinear with an axis of the groove cam. The guide rod 3 is a straight rod with a rectangular cross section, the first end of the guide rod is arranged in the active guide groove in a sliding mode, the second end of the guide rod is rotatably provided with a roller 4, the first end of the guide rod slides in the active guide groove and then stretches out and draws back relative to the active guide groove, the roller is rotatably arranged at the second end of the guide rod through a pin shaft 9 and is arranged in a groove of the groove cam, and the roller rolls in the groove of the groove cam. The pin shaft is also hinged with a connecting rod 5, the first end of the connecting rod 5 is hinged with the pin shaft, and the second end of the connecting rod is hinged with the sliding block 6. The sliding block is arranged on the frame of the rapier loom in a sliding way and reciprocates along a straight line. The slide block is fixedly connected with a nut 7, and the nut is in threaded connection with a screw 8. As shown in fig. 2, a rapier wheel 10 is fixed at the end of the screw, and the rapier wheel is a prior art. The rapier conveying wheel drives the weft insertion rapier head to move from two sides to the middle of the rapier loom through the rapier belt. The rapier wheel, the rapier band and the weft insertion rapier head are prior art and are not described in detail herein.

The working principle of the weft insertion mechanism is as follows: firstly, the active guide groove 2 rotates to drive the guide rod 3 to rotate, the guide rod drives the roller 4 to roll in the groove of the groove cam when rotating, and then the connecting rod 5 drives the sliding block to move left and right along the guide rail on the rapier loom frame, so as to drive the nut to do synchronous motion. When the nut moves back and forth, the screw rod is driven to rotate forward and backward, and the rapier conveying wheel is driven to rotate forward and backward. Thereby driving the rapier tape 11 and the weft insertion rapier head 12 to perform weft insertion movement. The left and right sides at rapier weaving machine respectively is provided with one set the utility model discloses a weft insertion mechanism, one of them set weft insertion mechanism carries the woof, and another set weft insertion mechanism connects and gets the woof. When the rotation angle theta of the driving guide groove 2 is increased from 0 degree to 180 degrees, the weft insertion rapier heads on the two sides simultaneously move forward to the middle of the rapier loom to prepare for weft yarn handing-over; when θ increases from 180 ° to 360 °, the weft insertion heads 12 on both sides are retracted to the initial position simultaneously. The weft yarn is transferred by the two weft insertion rapier heads 12 in the middle advancing and retreating process. Therefore, the weft insertion rapier head 12 can take over the weft yarn once when the rapier wheel 10 rotates once in the positive and negative cycles.

The nut 7 and the screw 8 are both of equal pitch. When in work, the two parts are in helicoid contact. Because the left and right sides of the rapier loom are respectively provided with a set of weft insertion mechanisms, the rotating direction of each set of threads can be selected to be left-handed or right-handed according to the design requirements. In this mechanism, the grooved cam 1, although stationary, is still the roller 4 as its follower in terms of relative motion theory. The conventional design method is to determine the motion law of the roller 4 and then obtain the theoretical profile of the grooved cam 1. Vice versa, different theoretical profiles of the grooved cam are selected or designed, different motion laws of the roller 4 can be obtained, then different motion laws of the nut 7 can be obtained, and therefore the mechanism can obtain different weft insertion motion laws.

The main motion parameters of the weft insertion mechanism of the present invention, as shown in fig. 1, are obtained from the axis position of the active guide slot 2 by using the rectangular coordinate system XOY. The rotation angle theta of the driving guide groove 2 takes the X-axis negative direction as a starting point and rotates anticlockwise.

1. The maximum weft insertion stroke of the mechanism.

Assuming that the lead of the screw thread is T, the total rotational angle of the screw is α:

then α ═ L/T ═ 2 · (radians)

The maximum weft insertion stroke S can be obtained according to alpha:

s ═ α x D/2 (meter)

In the formula: d: the diameter of the rapier transmitting wheel.

2. Acceleration value of mechanism at characteristic point

The utility model discloses an among the wefting insertion mechanism, confirm the displacement, speed, the acceleration value size of wefting insertion sword head at the arbitrary moment, be the resultant motion law of theoretical profile and components such as roller, connecting rod, slider, nut, screw rod of slot cam 1. The magnitude of the absolute value of the acceleration of the weft insertion rapier head is an important index for measuring the working performance of the weft insertion mechanism: the absolute value of the acceleration at each characteristic point is not suitable to be too large, otherwise, the defects of mechanism vibration, large noise and the like can be caused; at the middle position of the rapier loom, the absolute value of the acceleration is better than the minimum value, so that accurate connection of weft yarns is facilitated.

Fig. 4 shows the acceleration motion curve of the weft insertion rapier head of the weft insertion mechanism of the utility model, fig. 5 is the acceleration motion curve of the weft insertion rapier head of several weft insertion mechanisms when the same working width and the main shaft rotating speed, the curve numbered Q2 in the figure is the acceleration motion curve of the crank block + variable pitch screw rod weft insertion mechanism, in the range of 0-90 degrees, and the acceleration motion curve Q1 of the weft insertion mechanism of the utility model is basically coincided, in the range of 90-270 degrees, the absolute value of the acceleration is inversely larger than the acceleration of the weft insertion mechanism of the utility model, and the weft insertion mechanism is only consistent with the mechanism at 180 degrees. This is sufficient to show that the weft insertion mechanism of the present invention has excellent motion characteristics. Q3 is the acceleration motion curve of the wefting mechanism combined by the conjugate cam, the connecting rod and the gear, and Q4 is the acceleration motion curve of the wefting mechanism combined by the space crank rocker, the connecting rod and the gear. According to the above graph, the utility model discloses a wefting insertion sword head acceleration value range of wefting insertion mechanism when same working width, same main shaft rotational speed is minimum.

Table 1 shows the acceleration values and angular positions of the weft insertion rapier heads of the four weft insertion mechanisms at the characteristic points such as the initial point, the terminal point (i.e. the weft yarn connecting point).

TABLE 1 characteristics of four weft insertion mechanismsAcceleration value comparison unit of feature points: (m/s)²)。

As can be seen from the above description, the present invention has the following advantages:

(1) the theoretical profile of the groove cam is optimally designed, so that the optimal weft insertion motion rule can be obtained; the acceleration absolute value is smaller when the weft yarns are handed over, the mechanical amplitude is small, the noise is low, and accurate weft insertion is facilitated.

(2) The screw and the nut are both of equal pitch, so that the screw and the nut are easy to manufacture; when the device works, the two are in contact with each other by the spiral surface, so the service life is long; the installation and the maintenance are convenient.

(3) The mechanism is simple, the transmission chain is short, the problem that the moving amplitude of the weft insertion rapier head is large in other types of weft insertion mechanisms is solved, and the weft insertion movement is accurate and reliable.

(4) Is suitable for high-speed rapier loom.

(5) Is suitable for the maintenance and the reconstruction of an imported rapier loom.

Claims

1. Cam guide screw wefting insertion mechanism, characterized by, it includes:

the groove cam is fixedly connected with the rapier loom frame;

the roller is rotatably arranged at the second end of the guide rod;

2. The cam-guide spiral weft insertion mechanism according to claim 1, wherein the cross-section of the guide bar and the cavity of the active guide slot are rectangular.

3. The cam-guide spiral weft insertion mechanism according to claim 1, wherein the roller is rotatably connected to the guide by a pin.

4. The cam-guide spiral weft insertion mechanism according to claim 1, wherein a first end of the link is hinged to the pin and a second end of the link is hinged to the slider.

5. The cam-guide spiral weft insertion mechanism of claim 1, wherein the nut and screw are of equal pitch.

6. The cam-guide spiral weft insertion mechanism according to claim 1, wherein the slider is fixedly connected to the nut.