Method and device for detecting whisker density of pre-spinning equipment or whisker detection equipment

Abstract

This invention discloses a method and apparatus for detecting sliver density in a pre-spinning device or sliver detection device. The pre-spinning device or sliver detection device includes a cotton guide, and the sliver density detection device includes a detection element and a force sensor. The detection element includes a detection rod or a detection plate, with one end being the detection end, which is placed inside the cotton guide. A pin is installed on the pre-spinning device or sliver detection device, and the other end of the detection element or the detection element itself is mounted on the pin. The force sensor is abutted against or connected to the detection element and is installed on the pre-spinning device or sliver detection device. The pin serves as a fulcrum for the detection element, and the distance from the fulcrum to the detection end is greater than the distance from the fulcrum to the point where the force sensor abuts against or connects with the detection element. This invention can accurately detect sliver density, even subtle changes in sliver density. It has a simple structure, good repeatability, and high reliability, and can detect the density of slivers of different thicknesses.

Description

Technical Field

[0001] The present invention relates to a whisker density detection method and device for a pre-spinning device or a whisker detection device, and specifically to a whisker density detection method and device for a pre-spinning device such as a carding machine, a combing machine and various drawing machines, and a whisker detection device, belonging to the field of textile equipment and process technology. Background Art

[0002] With the rapid development of textile technology, the requirements for textile quality are also increasing. Combing and drawing are important processes in spinning, which play a decisive role in improving the spinning quality. Therefore, in the production process of whiskers, the instantaneous density changes of whiskers should be monitored and adjusted at any time to ensure the uniformity of whiskers.

[0003] The existing sliver density detection device, such as the structure disclosed in the Chinese utility model patent with patent number ZL201120221031.1, includes a sliver input terminal, a displacement sensor, a displacement sensor mounting seat, a spring and a detection lever. A U-shaped groove is provided on the sliver input terminal, and the detection lever is arranged in the U-shaped groove. The rod of the detection lever is rotatably connected with the sliver input terminal, and the lower end is located in the sliver outlet cavity of the sliver input terminal. The upper end is supported on the spring, and the other end of the spring is supported on the spring seat of the sliver input terminal. The displacement probe of the displacement sensor is supported on the rod of the detection lever. During operation, when the density of the sliver changes, under the joint action of the sliver and the spring, the lower end of the detection lever swings up and down around the rotating shaft, thereby driving the rod of the detection lever to move up and down, and triggering the displacement probe on the displacement sensor to generate a detection signal output. The device has the following disadvantages in the actual working process:

[0004] (1) Since momentum is the product mv of the mass m of a particle and its velocity v, the momentum of a moving sliver is the vector sum of the momentums of the particles in the sliver. The moving sliver is against the lower end of the detection lever. The uneven slivers transfer a certain amount of momentum to the detection lever, and the detection lever obtains momentum to swing around the rotation axis. It can be seen that the swing amplitude of the detection lever is not only related to the thickness of the sliver, but also to the running speed of the sliver, which greatly reduces the accuracy of the sliver thickness detection data;

[0005] (2) When the device is working, the spring applies force to the detection lever, and the cotton sliver is fluffy. The lower end of the detection lever can swing around the rotation axis. The spring changes the size of the channel when the cotton sliver leaves the cotton sliver input end through the detection lever. Thick cotton slivers are given a large channel, and vice versa. That is, during the entire detection process, the volume of the cotton sliver, the density of the cotton sliver and the volume of the cotton sliver channel are all dynamically changing. The thick or thin cotton slivers are detected under different conditions, which greatly reduces the accuracy of the cotton sliver thickness detection data;

[0006] (3) When the device is working, the spring acts on the detection lever, and the lower end of the detection lever needs to swing around the rotating axis. The spring is an energy storage element, and the lower end of the detection lever swings around the rotating axis, which will produce friction damping. When the thickness, that is, the density, of the cotton strips changes, the spring stiffness and the spring's own inertia and friction damping make it impossible for the displacement sensor to respond to the changes in the density of the cotton strips in a timely and rapid manner. There is a serious lag effect, and in the time domain, it shows a certain transition process. At present, the speed of the drawing machine reaches 600 to 1200 meters per minute. For the detection of uneven weight of some short segments of cotton strips (for example, 0.25 meters), the device cannot respond in time, and its application scope is limited;

[0007] (4) The lower end of the detection lever of the device swings up and down around the rotating shaft, which is an abnormal external exciting force. The spring is prone to forced simple harmonic vibration. This vibration is the background noise of the displacement sensor, which seriously interferes with the detection of the displacement sensor and easily produces coarse and fine cotton strips, affecting the quality of the cloth and the yarn dryness, causing mechanical waves;

[0008] (5) The lower end of the detection lever of the device swings up and down around the rotating shaft, and friction damping is generated between the detection lever and the rotating shaft. This damping is nonlinear, and the magnitude of the damping torque is related to the deformation of the spring and the moving speed of the cotton strip. Moreover, this swinging structure greatly weakens the rigid body stiffness of the entire device. In the frequency domain, it is not ruled out that the cotton strip thickness detection data can be trusted when the strip output speed is around 700 m / min. When the strip output speed is above 900 m / min, the deviation of the cotton strip thickness detection data exceeds the allowable range;

[0009] (6) The device uses a displacement sensor, which has very high requirements for the processing accuracy of the detection lever and spring and the thermal expansion performance of the material. In addition, the reaction force of the spring is associated with multiple variables, and the properties of the produced spring are highly discrete. The corresponding cotton sliver density detection device has a large output deviation for changes in the thickness of the cotton sliver. Therefore, the detection repeatability is poor, the detection accuracy is highly discrete, and the calibration is difficult. Moreover, the device cannot detect subtle density changes of the cotton sliver, and the detection accuracy is poor.

[0010] (7) When the device is working, cotton wool and debris are adsorbed on the spring, which is difficult to handle and interferes with the normal operation of the detection spring. The daily maintenance workload is large, and there are many parts, complex structure, complicated procedures, and it is not easy to replace;

[0011] (8) The displacement retractable detection end of the device is against the protrusion of the detection lever. When the thickness of the cotton strip changes, the outer contour curve of the protrusion of the detection lever does not apply positive pressure in the displacement direction to the displacement retractable detection end of the displacement sensor, which adds a component of force that is not conducive to its work. As a result, the displacement detection end of the displacement sensor will have telescopic damping, affecting the detection accuracy of the device and failing to ensure the long-term reliable operation of the displacement sensor.

[0012] In summary, the sliver density detection device and the corresponding detection method in the prior art have great influence on the detection accuracy, repeatability, stability, etc. of the density due to the above-mentioned shortcomings. Therefore, it is difficult to accurately monitor the sliver CV% and weight unevenness, which directly affects the evenness of the sliver and the quality of the yarn. Summary of the invention

[0013] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a whisker density detection method for a pre-spinning device or whisker detection device that can accurately detect whisker density and is easy to operate. At the same time, the present invention also provides a whisker density detection device for a pre-spinning device or whisker detection device, which can accurately detect whisker density, and can avoid multi-parameter correlation of detection results in the detection mechanism, avoid using components with large discreteness and low repeatability in the detection part, and has a reasonable and simple structure, good repeatability, and high reliability.

[0014] In order to solve the above technical problems, the present invention adopts a method for detecting the density of whiskers of a pre-spinning device or a whisker detection device, comprising:

[0015] a. Setting a detection member and a force sensor, wherein the detection member includes a detection rod or a detection plate, setting one end of the detection member as a detection end, and providing a fulcrum on the detection member, and placing the detection end of the detection member in a cotton guide of a pre-spinning device or a whisker detection device;

[0016] b. The whiskers moving in the cotton guide act on the detection end of the detection piece, and transmit the force of the whiskers to the force sensor through the detection piece. The force sensor obtains a signal of the change of the whisker density from the force and detects the whisker density. In the process of the whiskers transmitting the force to the force sensor through the detection piece, the detection end of the detection piece is subjected to the whisker pressure in the cotton guide and the detection piece does not move.

[0017] As a preferred embodiment of the present invention, the force exerted on the force sensor by the change in whisker density is amplified by the fulcrum provided on the detection member.

[0018] As a preferred embodiment of the present invention, the method further comprises c. detecting the density of slivers of different thicknesses by adjusting the position of the detection end of the detection member in the cotton guide.

[0019] As a preferred embodiment of the present invention, a pin is provided on the pre-spinning device or the whisker detection device, and the pin is used as a fulcrum of the detection member.

[0020] In order to solve the above technical problems, the present invention adopts a whisker density detection device for a pre-spinning device or a whisker detection device, wherein the pre-spinning device or the whisker detection device includes a cotton guide, and the whisker density detection device includes a detection piece and a force sensor, wherein the detection piece includes a detection rod or a detection plate, one end of the detection piece is a detection end, and the detection end of the detection piece is placed in the cotton guide, a pin is arranged on the pre-spinning device or the whisker detection device, and the other end of the detection piece or the detection piece body is installed on the pin, the force sensor is abutted against or connected to the detection piece, and the force sensor is installed on the pre-spinning device or the whisker detection device.

[0021] As a preferred embodiment of the present invention, the pin shaft serves as a fulcrum of the detection member, and the distance from the fulcrum to the detection end is greater than the distance from the fulcrum to the point where the force sensor and the detection member abut or connect.

[0022] As a preferred embodiment of the present invention, the force axis of the force sensor coincides with a tangent line of an arc line with the center line of the pin shaft as the center and the point where the force sensor and the detection member abut or connect.

[0023] As a preferred embodiment of the present invention, the detection end of the detection member is provided with a curved surface.

[0024] As a preferred embodiment of the present invention, the whisker density detection device also includes a displacement mechanism, which includes a guide rail and a linear motion mechanism. The guide rail is installed on the front spinning device or the whisker detection device, and the force sensor is driven by the linear motion mechanism to move forward or backward along the guide rail.

[0025] As a preferred embodiment of the present invention, the linear motion mechanism includes a motor and a screw-nut pair, the force sensor is connected to the nut of the screw-nut pair, and the nut is slidably connected to the guide rail.

[0026] After adopting the above technical solution, the present invention has the following beneficial effects:

[0027] Since the detection end of the detection part bears the pressure of the whiskers in the cotton guide and the detection part does not move during the process of the whiskers transmitting the force to the force sensor through the detection part, the present invention adopts a structure in which the force sensor and the detection part are abutted or connected by the detection end of the detection part bearing the pressure of the whiskers in the cotton guide and the detection part does not move. In this way, during detection, the volume of the whisker detection channel in the cotton guide remains unchanged. Therefore, when the volume of the whisker detection channel remains unchanged, the present invention can ensure accurate detection of whisker density.

[0028] The present invention provides a fulcrum on the detection piece, and the distance from the fulcrum to the detection end is greater than the distance from the fulcrum to the point where the force sensor and the detection piece abut or connect. This can amplify the force of the whisker density change on the force sensor, so that the force sensor can also sense and detect slight density changes of the whisker, thereby greatly improving the detection accuracy of the whisker density.

[0029] The present invention adopts a structure in which the force axis of the force sensor coincides with the tangent of the arc line with the center line of the pin shaft as the center and the point where the force sensor and the detection member abut or connect. This can ensure that the force transmitted by the whisker to the force sensor through the detection member is a positive pressure, thereby further improving the detection accuracy of the whisker density, making the detection result more accurate, and at the same time ensuring that the force sensor can operate reliably for a long time.

[0030] The present invention can detect the density of whiskers of different thicknesses by adjusting the position of the detection end of the detection member in the cotton guide. When the present invention is working, there is no need to tediously replace the cotton guide according to the type and thickness of the whiskers. It only needs to electrically control or manually adjust the position of the force sensor against or connected to the detection member through the displacement mechanism, thereby changing the position of the detection end of the detection member in the cotton guide, and calibrating and storing the specifications of the whisker thickness corresponding to each position, so that the pre-spinning equipment or whisker detection equipment can more conveniently and quickly replace different whisker varieties, expand the whisker detection range, realize intelligent manufacturing, and improve production efficiency.

[0031] The present invention abandons the prior art of using a spring as a detection element, thereby avoiding multi-parameter correlation of the detection results in the detection mechanism and avoiding components with large discreteness and low repeatability in the detection element. The present invention has good repeatability and high reliability in sliver density detection, good linearity between sliver density and electrical signal output, and good signal-to-noise ratio, thereby improving the sliver evenness effect and reducing weight unevenness.

[0032] The whisk density detection device of the present invention is a very small inertia detection device with good rapid response and can quickly and efficiently detect the uneven weight of short whisk segments, laying a good foundation for reducing whisker breakage, dyeing color difference and fabric surface color in subsequent processes.

[0033] The invention has a reasonable and simple structure, is easy to install, easy to operate, convenient to maintain, has good matching and is easy to replace. The invention greatly improves the accuracy and reliability of whisker detection and has no special requirements on the processing and assembly accuracy of the detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0035] Figure 1 It is a structural schematic diagram of a whisker density detection device of the pre-spinning equipment or whisker detection equipment of the present invention.

[0036] Figure 2 It is a front view schematic diagram of a whisker density detection device of a pre-spinning device or a whisker detection device of the present invention.

[0037] Figure 3 The present invention is a simplified structural diagram of a whisker density detection device of a pre-spinning device or a whisker detection device.

[0038] Figure 4 It is a structural schematic diagram of the detection element in the present invention.

[0039] Figure 5 Another structural schematic diagram of the detection element in the present invention. DETAILED DESCRIPTION

[0040] See also Figures 1 to 5 , a whisker density detection method of a pre-spinning device or a whisker detection device, comprising

[0041] a. Set a detection member 1 and a force sensor 2, wherein the detection member 1 includes a detection rod or a detection plate, one end of the detection member 1 is set as a detection end 1-1, the detection member is provided with a fulcrum 0, and the detection end 1-1 of the detection member is placed in a cotton guide 3 of a pre-spinning device or a whisker detection device;

[0042] b. The whiskers 8 moving in the cotton guide 3 act on the detection end 1-1 of the detection member 1, and transmit the force of the whiskers 8 to the force sensor 2 through the detection member 1. The force sensor 2 obtains the signal of the change of the whisker density from the force, and detects the density of the whiskers 8. In the process of the whiskers 8 transmitting the force to the force sensor 2 through the detection member 1, the detection end 1-1 of the detection member 1 bears the pressure of the whiskers 8 in the cotton guide 3 and the detection member 1 does not move. In the present invention, after the force sensor 2 obtains the signal of the change of the whisker density, the density of the whiskers 8 is detected by conventional means, for example, the signal can be processed by a built-in microprocessor to obtain the density detection result, or the signal can be input into an electrical controller such as a DDC digital controller or an industrial computer or a single-chip microcomputer for processing to obtain the density detection result.

[0043] As a preferred embodiment of the present invention, the force exerted by the change in density of the whiskers on the force sensor 2 is amplified by the fulcrum 0 provided on the detection member 1, so that the force sensor 2 can also sense and detect slight density changes of the whiskers 8.

[0044] As a preferred embodiment of the present invention, the method further comprises c. detecting the density of the slivers 8 of different thicknesses by adjusting the position of the detection end 1 - 1 of the detection member 1 in the cotton guide 3 .

[0045] As a preferred embodiment of the present invention, a pin 4 is preferably provided on the frame 9 on the pre-spinning device or the whisker detection device, and the pin 4 is used as the fulcrum 0 of the detection member 1. In the present invention, when the force sensor 2 is removed, the detection member 1 can rotate around the fulcrum 0, i.e., the pin 4.

[0046] A whisker density detection device for a pre-spinning device or a whisker detection device, see Figures 1 to 5 The pre-spinning device or whisker detection device includes a cotton guide 3 and a frame 9. The whisker density detection device includes a detection member 1 and a force sensor 2. The force sensor 2 can be a pressure sensor, preferably a strain gauge force sensor. The detection member 1 includes a detection rod or a detection plate, for example Figure 4 The test board is shown. Figure 5 The figure shows a detection rod, one end of the detection member 1 is the detection end 1-1, and the detection end 1-1 of the detection member 1 is placed in the cotton guide 3. As shown in the figure, the detection end 1-1 is preferably placed in the whisker channel 3a of the cotton guide 3. A pin 4 is set on the pre-spinning equipment or the whisker detection equipment, and the other end 1-2 of the detection member 1 or the body of the detection member 1 is installed on the pin 4. The force sensor 2 is abutted against or connected to the detection member 1. The connection can be a detachable connection through bolts or a fixed connection such as welding. The force sensor 2 is installed on the pre-spinning equipment or the whisker detection equipment, such as on the frame 9.

[0047] As a preferred embodiment of the present invention, Figure 2 , 3 As shown, the pin shaft 4 serves as the fulcrum 0 of the detection member 1, and the distance L1 from the fulcrum 0 to the detection end 1-1 is greater than the distance L2 from the fulcrum 0 to the point where the force sensor 2 and the detection member 1 abut or connect. This can amplify the force exerted by the whisker density change on the force sensor 2, and the force sensor 2 can also sense and detect slight density changes of the whisker 8, thereby greatly improving the detection accuracy of the whisker density.

[0048] As a preferred embodiment of the present invention, Figure 2 , 3 As shown, the force axis of the force sensor 2 coincides with the tangent 11 of the arc line 10 with the center line of the pin shaft 4, i.e., the fulcrum 0 as the center and the force sensor 2 and the detection member 1 abutting or connecting therewith. This ensures that the force transmitted by the whisker 8 to the force sensor 2 through the detection member 1 is a positive pressure.

[0049] As a preferred embodiment of the present invention, Figures 1 to 5 As shown, the detection end 1-1 of the detection member 1 is provided with an arc surface 1a. The arc surface 1a is preferably a circular arc surface or an involute arc surface.

[0050] As a preferred embodiment of the present invention, the pin 4 is fixedly mounted on the frame 9 of the pre-spinning device or the whisker detection device, and the other end 1-2 of the detection member 1 or the body of the detection member 1 is preferably rotatably mounted on the pin 4 through a bearing or a sleeve. In the present invention, the pin 4 can also be rotatably mounted on the frame 9 of the pre-spinning device or the whisker detection device through a bearing, and the other end 1-2 of the detection member 1 or the body of the detection member 1 is fixedly mounted on the pin 4 or rotatably mounted on the pin 4 through a bearing or a sleeve. In the present invention, when the force sensor 2 is removed, the detection member 1 can rotate around the pin 4 or the fulcrum 0.

[0051] As a preferred embodiment of the present invention, Figure 1 , 2 As shown in FIG. 3 , the whisker density detection device also includes a displacement mechanism, which includes a guide rail 5 and a linear motion mechanism. The guide rail 5 is installed on a frame 9 of a pre-spinning device or a whisker detection device, and the force sensor 2 is driven by the linear motion mechanism to move forward or backward along the guide rail 5.

[0052] As a preferred embodiment of the present invention, Figure 1 , 2 As shown in Figure 3, the linear motion mechanism includes a motor 6 and a screw-nut pair, the force sensor 2 is connected to the nut 7 of the screw-nut pair, and the nut 7 is slidably connected to the guide rail 5. In the present invention, the linear motion mechanism may not use the motor 6, but only use the screw-nut pair, and the nut 7 is moved forward or backward along the guide rail 5 by manually tightening the screw. In the present invention, it is only necessary to electrically or manually adjust the position of the force sensor 2 against or connected to the detection member 1 through the displacement mechanism, thereby changing the position of the detection end 1-1 of the detection member 1 in the preferred whisker channel 3a in the cotton guide 3, so as to realize the detection of whisker densities of different thicknesses. In the present invention, the linear motion mechanism may also use an electric push rod or a cylinder, etc., which are not shown in the figure.

[0053] After testing, the present invention can accurately detect the density of the whiskers, and can also accurately detect the slight density changes of the whiskers. It has a reasonable and simple structure, good repeatability, high reliability, and has achieved good results.

Claims

1. A whisker density detection device for a pre-spinning device or a whisker detection device, the pre-spinning device or the whisker detection device comprising a cotton guide (3), Features: The whisker density detection device comprises a detection member (1) and a force sensor (2), the detection member (1) comprising a detection rod or a detection plate, one end of the detection member (1) being a detection end (1-1), the detection end (1-1) of the detection member (1) being placed in a cotton guide (3), a pin shaft (4) being arranged on a pre-spinning device or a whisker detection device, the other end (1-2) of the detection member (1) or a body of the detection member (1) being mounted on the pin shaft (4), the force sensor (2) being abutted against or connected to the detection member (1), and the force sensor (2) being mounted on the pre-spinning device or the whisker detection device; The pin shaft (4) serves as a fulcrum of the detection member (1), and the distance from the fulcrum to the detection end (1-1) is greater than the distance from the fulcrum to the point where the force sensor (2) and the detection member (1) abut or connect. The force axis of the force sensor (2) coincides with a tangent line of an arc line with the center line of the pin shaft (4) as the center and with the point where the force sensor (2) and the detection member (1) abut or connect.

2. The whisker density detection device of the pre-spinning device or the whisker detection device according to claim 1, Features: The detection end (1-1) of the detection member (1) is provided with a curved surface (1a).

3. The whisker density detection device of the pre-spinning device or the whisker detection device according to claim 1 or 2, Features: The whisker density detection device further comprises a displacement mechanism, the displacement mechanism comprising a guide rail (5) and a linear motion mechanism, the guide rail (5) being mounted on the pre-spinning device or the whisker detection device, and the force sensor (2) being driven by the linear motion mechanism to move forward or backward along the guide rail (5).

4. The whisker density detection device of the pre-spinning device or the whisker detection device according to claim 3, Features: The linear motion mechanism comprises a motor (6) and a screw-nut pair, the force sensor (2) is connected to a nut (7) of the screw-nut pair, and the nut (7) is slidably connected to a guide rail (5).

5. A method for detecting whisker density using the whisker density detection device of the pre-spinning device or whisker detection device according to claim 1, Features: include a. Setting a detection member and a force sensor, wherein the detection member includes a detection rod or a detection plate, setting one end of the detection member as a detection end, and providing a fulcrum on the detection member, and placing the detection end of the detection member in a cotton guide of a pre-spinning device or a whisker detection device; b. The whiskers moving in the cotton guide act on the detection end of the detection piece, and transmit the force of the whiskers to the force sensor through the detection piece. The force sensor obtains a signal of the change of the whisker density from the force and detects the whisker density. In the process of the whiskers transmitting the force to the force sensor through the detection piece, the detection end of the detection piece is subjected to the whisker pressure in the cotton guide and the detection piece does not move.

6. The method for detecting whisker density according to claim 5, Features: The force exerted on the force sensor by the change in the density of the whiskers is amplified by the fulcrum provided on the detection member.

7. The method for detecting whisker density according to claim 5 or 6, Features: The method also includes c. detecting the density of slivers of different thicknesses by adjusting the position of the detection end of the detection member in the cotton guide.

8. The method for detecting whisker density according to claim 5, Features: A pin is arranged on the pre-spinning device or the whisker detection device, and the pin is used as a fulcrum of the detection member.

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