CN107777464B

CN107777464B - Suction device and method for monitoring a suction channel section of a suction device with a sensor

Info

Publication number: CN107777464B
Application number: CN201710716606.9A
Authority: CN
Inventors: U·霍尔特
Original assignee: Saurer Germany GmbH and Co KG
Current assignee: Saurer Spinning Solutions GmbH and Co KG
Priority date: 2016-08-24
Filing date: 2017-08-21
Publication date: 2020-07-24
Anticipated expiration: 2037-08-21
Also published as: JP2018039672A; TR201711788A2; CN107777464A; DE102016115731A1; JP7009115B2

Abstract

The invention relates to a suction device and a method for monitoring a suction channel section of a suction device with a sensor. The suction device is used for sucking the yarn end of the yarn (10) wound on the winding bobbin. The suction device (1) comprises a housing (2) forming a suction channel (4) extending between a first housing opening (6) for sucking a yarn end (12) into the suction channel (4) and a second housing opening (8) for connecting to a suction point of a workstation of a textile machine, which station is rotatably holding a wound bobbin and is connected to a source of negative pressure. The housing (2) has a transparent or open wall (20) between the first housing opening (6) and the second housing opening (8) for exposing a section of the suction channel (4). In addition, the suction device (1) cooperates with a sensor device (22) for monitoring the exposed suction channel section. The suction device (1) is characterized in that the sensor device (22) is arranged on the transparent wall or in the open wall (20) and is designed to detect the presence of a sucked-in yarn (10) in the exposed suction channel section.

Description

Suction device and method for monitoring a suction channel section of a suction device with a sensor

Technical Field

The invention relates to a suction device for sucking in the end of a thread wound on a bobbin and a method for monitoring a section of a suction channel capable of receiving negative pressure of a pivotable suction device of a textile machine for producing cross-wound bobbins by using a sensor.

Background

Such a suction device and a method for monitoring a suction channel section that can receive a negative pressure with a sensor are used in textile machines that are designed for winding bobbins, so-called winding bobbins, such as cross-wound bobbins. Winding machines and air-flow spinning machines are exemplified in this regard.

Such a winding machine is known, for example, from DE19640184a 1. The winding machine comprises a plurality of winding positions for winding the yarn from the cop to winding bobbins respectively. In the case of a thread break or a thread cut, a thread end falls on the circumferential surface of the winding bobbin. For the joining of the separated thread or its two thread ends, the so-called splicing, the thread end on the winding bobbin side is withdrawn from the circumferential surface of the winding bobbin by a predetermined length and is fed to the feed device assigned to the winding position, prepared and connected to the thread end on the cop side. For drawing off the thread end on the winding bobbin side, a pivotable suction device with a suction nozzle is used, the free nozzle of which is brought into the vicinity of the surface of the winding bobbin by pivoting the suction device. The suction nozzle is designed to receive a negative pressure, as a result of which a suction flow is generated in a suction channel of the suction nozzle. The winding bobbin is rotated counter to the winding direction or the spooling direction under the application of negative pressure, so that a yarn head on the winding bobbin side is grasped from the surface of the winding bobbin, and the yarn is gripped and can be moved together with the pivoting movement of the suction nozzle. The suction device comprises sensor means for knowing the presence of the gripped yarn in the suction channel ending at the mouth of the suction nozzle. The sensor device is arranged in the suction channel at such a distance from the suction opening that a defined thread length can be sucked in. When a defined thread length is reached, the sensor signal is interrupted in order to realize, by means of the control mechanism, a clamping jaw with a defined thread length drawn in.

Another suction device for winding machines only and also for rotor spinning machines is known from document EP3040299a 1. The suction device has a transparent wall, which allows the sensor to see into the adjoining section of the suction channel of the suction device. A sensor or sensor device is arranged in a stationary manner on the working station, so that it is arranged opposite the transparent wall when the suction device is pivoted into the gripping position, in such a way that the suction channel section can be monitored by the transparent wall.

Disclosure of Invention

In view of the above-described prior art, the invention proposes, according to a first aspect, a suction device for sucking in a thread end of a thread wound on a winding bobbin. A winding bobbin can be, for example, a bobbin tube which is held rotatably in a creel of a textile machine, such as a winding machine or a rotor spinning machine, onto which the yarn is wound or wound.

The suction device generally comprises a housing which forms a suction channel extending between a first housing opening for sucking the end of the thread into the suction channel and a second housing opening of a workstation of a textile machine, such as a winding machine or a rotor spinning machine, which can rotate and hold a wound bobbin, for connection to a suction point connected to a source of underpressure.

The housing has a transparent wall or open wall between the first housing opening and the second housing opening to expose the suction channel section. Different embodiments of such housings have long been known, in particular with regard to materials, shapes and dimensions, and the following description will essentially only describe aspects of the invention which differ from the usual embodiments.

The suction device can be, for example, a so-called suction nozzle, which consists of a suction pipe and a suction head connected thereto with a nozzle opening forming the first housing opening. The suction device or the suction nozzle can preferably be constructed in one part or in several parts. In particular, the suction pipe and the suction head can be formed as several parts which can be connected to one another by corresponding connecting points, so that the suction pipe and the suction head form a common channel from a first housing opening or suction nozzle opening to a second housing opening associated with the suction pipe for the purpose of suction or gripping of the yarn end. The wall portion can preferably be selectively formed on the suction tube or the suction head.

The suction device is also set up and configured to cooperate with a sensor device for monitoring the exposed suction channel section.

In contrast to the previously known embodiments, the sensor device is arranged on the transparent wall according to a first alternative in such a way that it detects the presence of the suctioned thread in the exposed suction channel section or monitors the exposed suction channel section on the wall for determining the presence of the thread in the exposed suction channel section. The sensor device is arranged on the side of the transparent wall opposite the exposed suction channel section. The transparent wall is thus designed to allow the sensor to see into the exposed suction channel section.

According to a second alternative, the sensor device is arranged in the open wall in such a way that it detects the presence of a sucked-in yarn in the exposed suction channel section or monitors the exposed suction channel section on the wall to determine the presence of a yarn in the exposed suction channel section.

The sensor device then projects at least into the plane defined by the open wall. The sensor device here preferably occupies the plane defined by resting directly or indirectly on the edge of the open wall surrounding the plane. In this connection, indirect mounting means that at least one further element is placed in between, which further element can be, for example, a seal for improving the sealing action and/or a joint for accommodating sensor devices having different dimensions. By means of such a joint, for example, the freedom in terms of selecting commercially available sensor devices can be increased. When directly mounted, the sensor device is placed on the edge of the open wall without further intermediate pieces.

In the preferred embodiment described above, the sensor element associated with the sensor device for detecting the presence of a thread preferably reaches into the plane defined by the open wall or adjoins it to the transparent wall in order to be placed so that, with the application of negative pressure, a detection takes place transversely, in particular perpendicularly, to the direction of the suction effect present in the suction channel section. The wall is designed to receive the sensor device at a defined location or to hold the sensor device in a fixed position relative to the wall.

It is further preferred that the sensor device can alternatively be arranged in the open wall in such a way that a sensor part associated with the sensor device enters the exposed suction channel section for placement, by passing through the plane defined by the open wall. The detection range can thereby be enlarged in such a way that the suction channel section adjoining the exposed suction channel section can be better monitored in the direction of suction action. Depending on the depth of penetration or the arrangement of the sensor component in the exposed suction channel section, the detection range size can be varied.

The solution proposed by the invention allows, on the one hand, a structurally simple and flexible design and arrangement of the sensor device. The textile machine station region opposite the suction channel in the gripper position of the suction device can be freely designed independently of the sensor device that must be arranged. On the other hand, the distance between the monitored region within the suction channel section and the sensor device can be reduced to a minimum. In addition, the sensor device can be placed on the suction device as desired. For example, the sensor device can be arranged so close to the mouth region of the suction nozzle that the yarn detection time can be significantly reduced, so that the productivity of the textile machine can be significantly increased. In addition, a minimum switching time, a minimum energy consumption and a minimum yarn waste can be guaranteed.

According to a preferred embodiment, the transparent wall portion or the open wall portion has a smaller distance from the first housing opening than the distance from the second housing opening along the longitudinal extension axis of the suction channel from the center of its surface. For this purpose, the arrangement of the sensor device in the vicinity of the mouthpiece can be realized in a simple manner.

The housing is preferably formed at least in two parts from a separate suction nozzle having a first housing opening and a separate suction line having a second housing opening, wherein the suction line and the suction nozzle can be connected to one another by a connecting point forming the suction channel, wherein the transparent wall or open wall is formed by the suction line and/or the suction nozzle. Accordingly, the location of the wall or of the sensor device can also be defined as required afterwards by replacing individual suction ducts and/or individual suction nozzles.

The sensor device preferably comprises a reflection sensor with a Bluetooth interface and/or a W L AN interface for the wireless transmission of sensor data, whereby the wiring costs required for this purpose can be saved.

Alternatively or additionally, the sensor device is preferably driven by means of a contactless energy transmission device. It may be arranged on the suction device with or spaced from the sensor device. The latter arrangement of course determines a certain but modest wiring cost.

It is also preferred that the bluetooth interface and/or the W L AN interface are designed for receiving signals affecting the sensor device, whereby for example a check and/or calibration of the sensor device can be initiated or facilitated and performed.

In addition, the wireless transmission device may be used to provide a redundant transmission system that may take over the transmission and/or reception of data when the transmission function of the Bluetooth interface and/or the W L AN interface of the sensor device fails.

According to a further preferred embodiment, the housing comprises at least one further transparent wall portion or open wall portion spaced apart from the wall portion for accommodating the sensor device or a further sensor device, in particular of the same type as the sensor device. In this way, a plurality of placement locations for one sensor device or for a plurality of sensor devices can be provided on the suction device.

According to a second aspect, the invention also provides a method for monitoring, with a sensor, a section of a suction channel that can receive negative pressure of a pivotable suction device of a textile machine that produces wound bobbins, in particular a winding machine or a rotor spinning machine. The suction channel section is delimited by a transparent wall portion or an open wall portion of the housing forming the suction channel. In this case, the yarn wound on the winding bobbin can be gripped by the suction channel by means of the yarn end of the yarn, in an occupiable gripping position of the suction device.

The method comprises the step of applying an underpressure to the suction channel before or during the occupation of the gripper position or in the gripper position. The application of negative pressure in connection with the pivoting of the suction device can be selectively activated as desired. It is important that there is a negative pressure in the suction channel at the moment of gripping to ensure suction of the yarn head.

The method is characterized in that a step of detecting whether a yarn is present in the suction channel section exposed by the transparent wall portion or the open wall portion is provided by means of a sensor device arranged on the transparent wall portion or in the open wall portion. Whereby the aforementioned advantages can be obtained in the same manner. The pivotable suction device may advantageously be one of the preferred embodiments of the suction device according to the first aspect, whereby the advantages that follow can be ensured.

According to a preferred embodiment, the method comprises the step of wirelessly transmitting at least the information obtained by the sensor device about the presence of the thread by means of the sensor device or a wireless transmission device associated with the sensor device and mounted on the suction device housing. The information obtained by the sensor device directly in relation to the workstation and preferably also the information relating to the sensor device can therefore be recalled approximately independently of the location within the transmission range of the sensor device or the wireless transmission device.

In a further preferred manner, data, for example control commands, can be transmitted wirelessly to the sensor device in a further step, in particular by means of the wireless transmission device. The checking function or calibration of the sensor device as described above by way of example can thereby be initiated and carried out.

Drawings

Other features and advantages of the invention will be apparent from the following description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings and from the claims. The individual features can be implemented in a preferred embodiment of the invention either individually per se or in any combination of a plurality.

Preferred embodiments of the present invention are described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic side sectional view of a suction device according to an embodiment, an

Fig. 2 is a schematic rear view of a suction device according to another embodiment.

Detailed Description

In the following description of the exemplary embodiments according to the invention, the same or similar reference numbers are used for components which are illustrated in the various figures and which function in a similar manner, and a repeated description of these components is not given here.

Fig. 1 shows a schematic side sectional view of a suction device 1 according to an embodiment.

The suction device 1 comprises a housing 2 with a suction channel 4, which extends between a first housing opening 6 for sucking a thread end of a thread 10 wound on a winding bobbin, not shown, into the suction channel 4 and a second housing opening 8 for connection to a suction point of a textile machine station, which rotatably holds the winding bobbin, which suction point is connected to a negative pressure source, not shown. The textile machine may be, for example, a winding machine or a rotor spinning machine.

The housing 2 is formed in two parts by a single suction nozzle 14, which comprises the first housing opening 6, and a single suction pipe 16, which comprises the second housing opening 8. The suction pipe 16 and the suction nozzle 14 are connected to each other by a connection point 18 forming the suction channel 4. In the preferred embodiment, the suction nozzle 14 is inserted with its free end precisely into the free open end of the suction pipe 16, wherein the connection point 18 has a screw connection 19 (fig. 2) for mounting the suction nozzle 14 on the suction pipe 16. Alternatively, the free ends can be coupled to one another, in particular detachably, for example by a press fit or a locking connection.

The suction device 1 has a wall portion 20 which is open, whereby a section of the suction channel 4 is exposed. The open wall portion 20 has a smaller distance from the first housing opening 6 from its surface center along the longitudinal extension axis of the suction channel 4 than from the second housing opening 8. The longitudinal extension axis of the suction channel 4 is defined by the central longitudinal axis of the suction channel 4 extending between the first housing opening 6 and the second housing opening 8. In the embodiment shown in fig. 1, the open wall portion 20 is formed near the connection site 18.

The sensor device 22 is arranged on the open wall 20 in such a way that a sensor part 24 of the sensor device 22 enters the open wall 20 for seating. The sensor part 24 now projects into the plane defined by the open wall portion 20. The sensor device 22 is designed to detect the presence and/or absence of the sucked-in thread 10 in the exposed suction channel section. The detection range 26 of the sensor device 22 extends, in particular conically, transversely to the longitudinal axis of extension from the sensor part 24 to the opposite inner wall of the suction channel 4.

The open wall 20 is completely covered by the sensor device 22. The sensor device 22 now seals the channel formed by the open wall 20 against leakage and thus against loss of the negative pressure or suction effect in the suction channel 4. The sensor device 22 can be mounted on the housing 2 by means of conventional fastening means, such as adhesive, locking, screwing or the like. In particular the sensor means 22 is detachably mounted on the housing 2.

The sensor device 22 is in this preferred embodiment set up for wireless transmission of sensor data, for which purpose the sensor device 22 comprises, for example, a conventional reflection sensor or optical scanner and a conventional bluetooth interface and/or a W L AN interface for wireless transmission of sensor data, the sensor device 22 can also preferably be designed to receive and process control signals influencing the sensor device 22 by means of this interface, for which purpose, for example, checking, calibration, etc. of the sensor device 22 can be facilitated and carried out, in addition, the sensor device 22 can be designed to transmit status information of the sensor device 22 by means of this interface.

The current supply of the sensor device 22 takes place by means of a power supply unit, for example a battery or a contactless energy transmission device, provided with the sensor device 22, in order to completely avoid wiring costs. Alternatively or additionally, the sensor device 22 can be supplied with at least the required drive energy by means of a connecting line to a power supply unit arranged at a distance from the sensor device 22.

Fig. 2 shows a rear view of the suction device 1 according to another embodiment. The suction device 1 is constructed approximately identically to the embodiment shown in fig. 1, with the only difference that an open wall 20 and thus a sensor device 22 are arranged. In this embodiment, the open wall 20 is disposed in a curved region of the suction nozzle 14, thereby being close to the first housing opening 6.

The suction device 1 shown in fig. 1 and 2 is designed in particular for a winding machine for rewinding a thread fed to a bobbin into a wound bobbin. The profile and design of such a suction device is common in addition to the features found in the present invention and need not be described further.

In the field of rotor spinning machines, for example rotor spinning machines, the suction device is designed in principle analogously to the suction device 1 shown in fig. 1 and 2 and is adapted only to the conditions of the rotor spinning. The arrangement of the open wall portion and the sensor means as shown in fig. 1 and 2 can be implemented smoothly in such a suction device in a corresponding manner.

According to another embodiment, not shown, a transparent wall can be provided on the suction pipe 16 and/or the suction nozzle 14 instead of the open wall. Such a transparent wall portion has the advantage over an open wall portion that leakage prevention measures are superfluous. The transparent wall is now hidden and the sensor device arranged on the transparent wall can monitor the section of the suction channel 4 exposed by the transparent wall to determine whether the yarn 10 is present. The transparent wall allows for this purpose, when a reflective sensor or an optical scanner is used, to obtain the desired measurement signal, for example an optical signal. The transparent wall thus forms a window on the mounting site which allows the sensor to see into the suction channel 4.

According to another embodiment, not shown, a wireless transmission device with a Bluetooth interface and/or a W L AN interface is provided, said interface being connected to the sensor device for wireless transmission of sensor data of the sensor device.

In another embodiment, not shown, a plurality of open and/or transparent wall portions are provided on the housing portion forming the suction duct and/or nozzle. In this way, the respective exposed suction channel section can be monitored without yarn by means of a sensor device which can be arranged on the open wall or on the transparent wall, respectively.

By using one of the above-described embodiments in a textile machine for producing wound bobbins, such as a winding machine or a rotor spinning machine, a method according to one embodiment for monitoring a suction channel of a pivotable suction device, which channel can receive a negative pressure, with a sensor can be carried out. The method comprises the step of applying an underpressure to the suction channel before or during the taking-up of the thread position or in the gripping position. The gripping position corresponds to a position of the suction device, in which the thread wound on the winding bobbin can be gripped by the suction channel by the thread end thereof. In addition, the method has the step of detecting the presence of a thread in the suction channel section exposed by the transparent wall portion or the open wall portion by means of a sensor device arranged on the transparent wall portion or in the open wall portion. The method also comprises the step of wirelessly transmitting information obtained by the sensor device about the presence of the thread by means of the sensor device or a wireless transmission device associated with the sensor device and mounted on the suction device housing.

The embodiments described and shown are chosen by way of example only. The different embodiments may be combined with each other completely or in respect of several features. One embodiment may also be supplemented with features of another embodiment. If an embodiment includes the logical relationship "and/or" between a first feature and a second feature, this may be interpreted as having both the first feature and the second feature according to one embodiment and having either only the first feature or only the second feature according to another embodiment.

Claims

1. A suction device (1) for sucking in the end of a thread (10) wound on a winding bobbin, wherein the suction device (1) comprises a housing (2) forming a suction channel (4) extending between a first housing opening (6) for sucking the end of the thread (12) into the suction channel (4) and a second housing opening (8) for connecting to a suction point of a station of a textile machine holding the winding bobbin rotatably, which is connected to a source of underpressure, wherein the housing (2) has a transparent or open wall (20) between the first housing opening (6) and the second housing opening (8) for exposing a section of the suction channel (4), wherein the suction device (1) cooperates with a sensor device (22) for monitoring the exposed suction channel section, characterized in that the sensor device (22) is arranged on the transparent wall or in the open wall (20) and is designed to detect the presence of a sucked-in yarn (10) in the exposed suction channel section, wherein a sensor component assigned to the sensor device for detecting the presence of a yarn is brought into the plane defined by the open wall or is adjacent thereto for arrangement such that a detection transverse to the direction of the suction action present in the suction channel section takes place with the application of a negative pressure, the transparent wall or the open wall (20) having a smaller distance from the first housing opening (6) from its surface center along the longitudinal extension axis of the suction channel (4) than from the second housing opening (8).

2. The suction device (1) according to claim 1, characterized in that the housing (2) is formed at least in two parts from a separate suction nozzle (14) comprising the first housing opening (6) and a separate suction pipe (16) comprising the second housing opening (8), wherein the suction pipe (16) and the suction nozzle (14) can be connected to each other by means of a connection (18) in such a way that the suction channel (4) is formed, and the transparent wall or the open wall (20) is formed by the suction pipe (16) and/or by the suction nozzle (14).

3. The suction device (1) according to claim 1, characterized in that the sensor device (22) is designed for wireless transmission of sensor data or is connected to a wireless transmission device arranged on the suction device (1) for wireless transmission of sensor data.

4. The suction device (1) according to claim 3, characterized in that the sensor device (22) comprises a reflective sensor with a Bluetooth interface and/or a W L AN interface for wireless transmission of sensor data.

5. The suction device (1) according to claim 3, characterized in that the wireless transmission means comprise a Bluetooth interface and/or a W L AN interface for wireless transmission of sensor data.

6. The suction device (1) according to any one of the preceding claims, wherein the housing (2) comprises at least one further transparent or open wall (20) spaced apart from the wall (20) for housing the sensor device (22) or for housing a further sensor device.

7. The suction device (1) according to claim 4 or 5, characterized in that the Bluetooth interface and/or W L AN interface sensor means (22) are adapted to receive control signals affecting the sensor means (22).

8. The suction device (1) according to claim 6, characterized in that said casing (2) comprises at least one further transparent or open wall (20) spaced apart from said wall (20) for housing a further sensor device of the same type as said sensor device (22).

9. Method for monitoring, with sensors, a section of a suction channel (4) of a pivotable suction device (1) of a textile machine for producing crosswound bobbins, which suction channel section is delimited by a transparent or open wall (20) of a housing (2) forming the suction channel (4) and can grip a yarn (10) wound on a wound bobbin by sucking its yarn head (12) into the suction channel (4) in an occupiable gripping position of the suction device (1), which suction channel extends between a first housing opening (6) and a second housing opening (8), wherein the method comprises the step of applying a negative pressure to the suction channel (4) before or during the occupiation of the gripping position or in the gripping position, characterized in that the method has the step of detecting, with the aid of sensor devices (22) arranged on the transparent wall or in the open wall (20), that a negative pressure is applied by the suction channel in the open wall (4) A step of detecting the presence of a yarn (10) in the suction channel section exposed by the transparent wall or the open wall (20), wherein a sensor component assigned to the sensor device for detecting the presence of a yarn is brought into the plane defined by the open wall or is adjacent thereto in order to be seated in order to detect a direction transverse to the direction of the suction action present in the suction channel section with the application of negative pressure, wherein the transparent wall or the open wall (20) has a smaller distance from the first housing opening (6) from the center of its surface along the longitudinal extension axis of the suction channel (4) than from the second housing opening (8).

10. Method according to claim 9, characterized in that it comprises the step of wirelessly transmitting the information about the presence of the thread (10) obtained by the sensor device (22) by means of the sensor device (22) or a wireless transmission device associated with the sensor device (22) and arranged on the housing (2) of the suction device (1).