Spinning preparation machine
By using airtight sidewalls and distribution conduits to separate fibers from air in the spinning preparation machine, combined with sensor monitoring, the problems of filling complexity and clogging in the tank mixer are solved, achieving uniform mixing and safe operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- MASCHINENFABRIK RIETER AG
- Filing Date
- 2023-02-16
- Publication Date
- 2026-07-31
AI Technical Summary
In existing fiber preparation systems, monitoring the filling level of the tank mixer is complex and prone to clogging, and the permeable walls lead to uneven filling and multiple clogging risks.
Design a spinning preparation machine that uses an airtight sidewall to surround the trough and separates the fiber material from the conveying air through a distribution conduit. Use two sensors to monitor the filling level to ensure uniform filling of the trough and prevent overfilling. Use perforated elements to separate fibers and air and use a light-blocking plate sensor to achieve low-maintenance filling control.
It enables simple and reliable monitoring of the tank mixer fill level, avoids the risk of clogging, ensures uniform fiber mixing and operational safety, and reduces maintenance costs.
Smart Images
Figure CN116623324B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a spinning preparation machine for mixing fibers, comprising a filling device for filling the spinning preparation machine with fibers. The spinning preparation machine is designed as a slot mixer having at least three slots, the filling device having a fiber material inlet and a delivery air outlet, and having a distribution conduit leading from the fiber material inlet through the at least three slots to the delivery air outlet. Background Technology
[0002] In the fiber preparation system of a spinning mill, supplied fibers or fiber bundles are prepared for use on the spinning machine. The fibers prepared for spinning undergo several processing stages in the fiber preparation system. In the first stage, the fibers are removed from the fiber bales in the form of fiber bundles. A so-called bale opener is typically used for this purpose. These bundles are conveyed out of the bale opener by a pneumatic bale transport vehicle and, for example, transferred to a downstream cotton cleaner.
[0003] Downstream of the cotton cleaner, fiber tufts are typically transported to a mixer, which, for example, ensures the fiber tufts are mixed through various troughs. The fibers are then removed from the mixer via a removal device, such as a nail-foot curtain, and continue to be conveyed. For example, DE 40 26 330 A1 discloses a general-purpose mixer with six troughs that open on their upper sides and are connected to a pneumatic transport line. In this case, the troughs are filled with fibrous material in the form of fiber tufts via a pneumatic transport system. These six troughs are separated from each other by perforated screens and from the space surrounding them, where the fibrous material is deposited and air is transferred from the troughs into the space and then forward to a filtration system via exhaust nozzles. Downstream of the distributor, the troughs initially extend vertically before bending 90°, such that the troughs or their tufted fillers now extend horizontally. The fibrous material located at the lower end of the troughs further moves into a layered structure on the upper section of a conveyor belt arranged below the troughs. Its horizontal extension terminates in front of a corner-nail curtain that essentially sweeps across all the slots in a vertical direction from bottom to top, removing the fibers. This design of the mixer as a slot mixer results in the mixing of fibers occurring at other times, due to the varying lengths of the slots—that is, the length of the path the fibers must travel—as fibers fed into the mixer at other times and thus from other packages are simultaneously removed from different slots through the corner-nail curtain. The mixture is then mixed and homogenized as the fiber material travels along different paths through the different slots.
[0004] EP 0 877 105 A1 also discloses a tank mixer with several tanks. By means of pneumatic transport using conveying air, fibrous material is distributed in the form of fiber bundles into the various tanks or chambers of the mixer. The conveying air is discharged from the chambers to an exhaust duct via vented sidewalls. Valves and vented surfaces are provided for each chamber. Valves are used to control the filling level of each chamber, and the valves open or close automatically based on the changing air pressure in each chamber.
[0005] CN 213 389 020 U discloses a mixer with multiple slots, wherein the slots are filled via a conveyor belt. The filling and emptying of each slot are controlled by a fill level measurement provided in each slot. CH 699 166 B1 also discloses a slot mixer with filling via a pneumatic conveying system and control of the fill level of each slot. Each slot has a rotary slide valve at its fibrous material inlet and an air outlet opening in the upper region, and each slot can be closed relative to the conveying system using the rotary slide valve. Each slot is equipped with upper and lower light-blocking plates for detecting the fill level.
[0006] A known drawback of the design is that monitoring the fill level is complex due to its reliance on the separation of the fiber material from the delivery air. Fill level measurements using sensors individually assigned to each chamber, such as light-blocking plates, do not address this issue. The presence of permeable walls in each chamber also introduces multiple risks of blockage. During operation, the permeability of the individual partition walls changes, resulting in varying fill levels in the chambers due to pressure conditions. This situation has been compensated for by corresponding adjustments made to the individual chambers. Summary of the Invention
[0007] Therefore, the object of the present invention is to provide a device that enables simple monitoring of a tank mixer.
[0008] This objective is achieved by a device having the features of the basic scheme of the present invention.
[0009] To achieve this objective, a novel spinning preparation machine for mixing fibers is proposed, comprising a filling device for filling the spinning preparation machine with fibers. The spinning preparation machine is designed as a slot mixer with at least three slots, and the filling device has a fiber material inlet and a delivery air outlet, as well as a distribution conduit guiding the fiber material inlet through the at least three slots to the delivery air outlet. The slots are surrounded by airtight sidewalls, and the distribution conduit is surrounded by airtight conduit walls on at least three sides. A first sensor and a second sensor for measuring the filling level of the spinning preparation machine are disposed in the slot closest to the delivery air outlet, with the second sensor arranged closer to the distribution conduit than the first sensor. As the filling device, a delivery conduit is provided through which the fiber material, along with the delivery air, is introduced into the distribution conduit as a fiber-air mixture. The distribution conduit remains open toward the slots. Due to the flow guided through the fiber material inlet, the delivery air reaches the delivery air outlet along the distribution conduit. The delivery air outlet is arranged on the side opposite the fiber material inlet, such that the fiber-air mixture sweeps across the slots. Fibers or fiber clusters fall into the slots. At the end of the dispensing conduit, a perforated element is installed to separate the fibrous material from the delivery air, thereby separating the dispensing conduit from the subsequent delivery air outlet conduit.
[0010] The fact that each slot is surrounded by airtight sidewalls results in a central air outlet at the end of the distribution duct. Since the distribution duct is guided above the slots, the slots are filled simultaneously, but in a manner that alters the flow conditions within the fiber-air mixture flowing into the distribution duct from the fiber material inlet. The flow slows, and the fiber material falls downwards into the slot due to gravity. In this case, the first slot after the fiber material inlet fills faster than the slot closest to the air outlet and thus furthest from the fiber material inlet. Because no airtight wall or wall area in the slot region provides for the deposition of air, the slot is completely filled up to its entire height up to the distribution duct. Once the first slot is full, the fiber material is further conveyed through the distribution duct to the slots following it. Due to this forced sequence of slot filling, the slot closest to the air outlet is filled last. Therefore, only this slot closest to the air outlet requires a corresponding sensor system for full-state measurement of the entire slot mixer. Limiting this to only two sensors offers the advantage of low maintenance requirements. To ensure operational safety during fill level measurement, two independent sensors are provided.
[0011] To achieve a good mixture of fibers from all slots in the same section, it is advantageous if the slot closest to the air outlet also contains the least amount of fiber material. For this purpose, the first and second sensors are preferably arranged in the upper third of the slot. A uniform mixture is determined in particular by the fact that, since the fiber material is located in the slot and acts at the lower end of the slot, the pressure acting in the slot is within a similar range in all slots.
[0012] Advantageously, the second sensor is positioned at a minimum distance of 200 mm from the distribution conduit. As a result, due to the amount of fiber material supplied to the spinning preparation machine within a certain time frame, there is a sufficiently long period after the sensor responds until overfilling occurs in the tank mixer, enough to stop the conveying system. Furthermore, it is advantageous if the first sensor is at least 200 mm away from the second sensor. Consequently, when the first sensor responds, control of the conveying system can be initiated, for example, to throttle the supply of fiber material and achieve a supply suitable for consumption. Alternatively, rapid filling of the spinning preparation machine with the highest conveying capacity can be terminated, and it can be switched to normal operation.
[0013] The third sensor for measuring the empty state is preferably positioned below the trough closest to the fiber material inlet. This has the advantage of detecting or preventing empty operation. As a result of the empty state measurement, the upstream supply of the spinning preparation machine can be switched to a higher level, or the downstream machine can be correspondingly throttled or shut down.
[0014] In a preferred embodiment, the sensor is designed as a light-blocking plate. Light-blocking plates have proven successful in yarn filling level measurement in spinning control technology, and are cost-effective and have low maintenance costs.
[0015] Preferably, at least the second sensor has a redundant design. To reliably prevent overfilling, the second sensor is implemented in duplicate. Alternatively, monitoring of the function of the second sensor can also be provided.
[0016] Furthermore, a method for filling a spinning preparation machine is proposed, the spinning preparation machine being designed according to the above description and having a controller. By controlling the machine, the filling of the spinning preparation machine is reduced during the time interval between the arrival of fiber material at a first sensor and its departure from the first sensor or its arrival at a second sensor. This allows the spinning preparation machine to be supplied with fiber material as needed in a manner suitable for the actual consumption of fiber material by subsequent machines.
[0017] Advantageously, upon reaching the first sensor, a full-state alarm is output by the controller. The output full-state alarm can be further processed in a higher-level controller and also serves as an optical or acoustic display for the operator. Furthermore, it is advantageous if an overfill alarm is output by the controller upon reaching the second sensor. The overfill alarm can be used to immediately shut off the supply of fiber material to the spinning preparation machine to avoid blockages in the fiber material conveying system. Attached Figure Description
[0018] The invention will now be described with reference to exemplary embodiments, and will be explained in more detail with reference to the accompanying drawings. In the drawings:
[0019] Figure 1 A schematic side view of a first embodiment of a spinning preparation machine;
[0020] Figure 2 Showing according to Figure 1 Schematic plan view of the first embodiment, and
[0021] Figure 3 A schematic side view of a second embodiment of a spinning preparation machine. Detailed Implementation
[0022] Figure 1 A schematic side view of a first embodiment of a spinning preparation machine according to the present invention is shown, and Figure 2 A plan view is shown. A spinning preparation machine of the type of groove mixer 1 with four grooves 2 to 5 is shown. In their extensions, grooves 2 to 5 are limited by the rear outer wall 16 of the groove mixer 1, the front outer wall 18 of the groove mixer 1, and side walls 17 respectively arranged laterally on the groove mixer 1. Each groove 2 to 5 is separated from each other by groove partition walls 9 to 11, which are separated along the entire width B of the groove mixer 1, rather than along its entire height H. Grooves 2 to 5 are configured to open at the top and bottom and be limited on the four sides. Groove 2 is limited by groove partition walls 9, the rear outer wall 16, and the side walls 17 of the groove mixer 1. Groove 3 is limited by groove partition walls 9 and 10 of the groove mixer 1 and the side walls 17. Groove 4 is limited by groove partition walls 10 and 11 of the groove mixer 1 and the side walls 17. Groove 5 is limited by groove partition walls 11 and 12 of the groove mixer 1, the front outer wall 18, and the side walls 17. At the lower end of each slot partition wall 9 to 12, a slot partition wall end piece 19 is provided directly adjacent to the slot partition walls 9 to 12. The slot partition wall end piece 19 is used to change the fiber flow sliding downward through slots 2 to 5 from vertical movement to horizontal movement.
[0023] Fiber material, in the form of a fiber-air mixture 21, is introduced into the tank mixer 1 through the fiber material inlet 20 and guided to the delivery air outlet 22 via the distribution conduit 25 above the tanks 2 to 5. At the delivery air outlet 22, delivery air 24 is separated from the fiber material by a separating element 36 and guided to the delivery air outlet conduit 23. The distribution conduit 25 is limited on three sides by an upper conduit wall 29 and two lateral conduit walls 27 and 28. The distribution conduit 25 opens into the tanks 2 to 5. Figure 1 In this diagram, the limitation of the distribution conduit 25 is shown as a conduit route 26 serving as an auxiliary line. A separation element 36, for example in the form of a perforated metal plate, is inserted during the transition from the distribution conduit 25 to the air delivery outlet conduit 23. The perforated element 36 separates the distribution conduit 25 from the air delivery outlet 22. As a result, the air delivery 24 is separated from the fibrous material.
[0024] The fibrous material is mixed by deflection in the various troughs 2 to 5 and subsequent horizontal conveying to the removal device 38 by means of the conveyor belt 37, as well as by a further ascending conveying within the removal device 38. In the illustrated embodiment, the removal device 38 is formed by a nail curtain and a discharge roller. The mixed fibrous material is transferred from the removal device 38 to an outlet conduit 39 leading to the fibrous material outlet 40.
[0025] A first sensor 30 and a second sensor 31, used for full-state measurement of the entire tank mixer 1, are positioned in tank 2, which is closest to the air delivery outlet 22. Since the distribution conduit 22 opens into tanks 2 to 5, tanks 2 to 5 are filled such that tank 2, furthest from the fiber material inlet 20, is filled last. For full-state warning, the first sensor 30 is attached at a distance 35 below the second sensor 31. The second sensor 31 is located at a maximum distance 34 below the distribution conduit 25.
[0026] Figure 3 A schematic side view of a second embodiment of a spinning preparation machine according to the present invention is shown. A spinning preparation machine 1 of the type of groove mixer having seven grooves 2 to 8 is shown. In their extensions, the grooves 2 to 8 are limited by the rear outer wall 16 of the groove mixer 1, the front outer wall 18 of the groove mixer 1, and side walls 17 respectively disposed laterally on the groove mixer 1. Each groove 2 to 8 is separated from each other by groove partition walls 9 to 15, similar to that according to the present invention... Figure 1 and 2 The embodiment is described. Slots 2 to 8 are configured to open at the top and bottom and be confined on the four sides. The confining of each slot 2 to 8 is similar to that according to... Figure 1 and 2The embodiments are implemented accordingly, and therefore their detailed description is omitted here. At the lower end of each slot partition wall 9 to 15, a slot partition wall end member 19 is provided, which in each case directly abuts the slot partition walls 9 to 15. The slot partition wall end member 19 is used to redirect the fiber flow sliding downward through slots 2 to 8 from vertical movement to horizontal movement.
[0027] Fiber material, in the form of a fiber-air mixture 21, is introduced into the tank mixer 1 through the fiber material inlet 20 and guided to the delivery air outlet 22 via the distribution conduit 25 above the tanks 2 to 8. In the delivery air outlet 22, the delivery air 24 is separated from the fiber material by a separating element 36 and guided into the delivery air outlet conduit 23. The distribution conduit 25 is limited on three sides by an upper conduit wall 29 and two lateral conduit walls 27 and 28. The distribution conduit 25 opens towards the tanks 2 to 8. This limitation of the distribution conduit 25 is shown as a conduit route 26 serving as an auxiliary line. A separating element 36, for example in the form of a perforated metal plate, is inserted during the transition from the distribution conduit 25 to the delivery air outlet conduit 23. The perforated element 36 separates the distribution conduit 9 from the delivery air outlet 22. As a result, the delivery air 24 is separated from the fiber material.
[0028] The fibrous material is mixed by deflection in the various tanks 2 to 8 and subsequent horizontal conveying to the removal device 38 by means of the conveyor belt 37, as well as by a further ascending conveying within the removal device 38. In the illustrated embodiment, the removal device 38 is formed by a nail curtain and a discharge roller. The mixed fibrous material is transferred from the removal device 38 to an outlet conduit 39 leading to the fibrous material outlet 40.
[0029] A first sensor 30 and a second sensor 31, used for full-state measurement of the entire tank mixer 1, are positioned in tank 2, closest to the air outlet 22. For redundancy, the second sensor 31 is supplemented by a fourth sensor 33 at the same height. Since the distribution conduit 25 opens to tanks 2 through 8, tanks 2 through 8 are filled such that tank 2, furthest from the fiber material inlet 20, is filled last. For full-state warning, the first sensor 30 is attached at a distance 35 below either the second sensor 31 or the fourth sensor 33. The second sensor 31 and the fourth sensor 33 are again located at a distance 34 below the distribution conduit 25. Furthermore, a third sensor 32, used to detect the empty state of the tank mixer 1, is arranged below tank 8, closest to the fiber material inlet.
[0030] This invention is not limited to the embodiments shown and described. Modifications and combinations of features within the scope of the claims are possible, even if these are shown and described in different embodiments.
[0031] Keywords
[0032] 1-slot mixer
[0033] 2-8 slots
[0034] 9-15 trough partition wall
[0035] Rear outer wall of the 16-slot mixer
[0036] 17. Sidewalls of the tank mixer
[0037] Front outer wall of the 18-slot mixer
[0038] 19 20 slot partition wall end pieces
[0039] 20 Fiber Material Inlet
[0040] 21 Fiber-Air Mixture
[0041] 22 Air delivery outlet
[0042] 23 Air outlet duct
[0043] 24. Air delivery
[0044] 25. Distribution catheter
[0045] 26. Catheter route
[0046] 27-29 Catheter wall
[0047] 30 First Sensor
[0048] 31 Second Sensor
[0049] 32 Third Sensor
[0050] 33. Fourth sensor
[0051] 34. Maximum Distance
[0052] 35 distance
[0053] 36 Separating elements
[0054] 37. Conveyor Belt
[0055] 38. Removal device
[0056] 39 Exit Channel
[0057] 40. Export of fiber materials
[0058] B width
[0059] H height
Claims
1. A spinning preparation machine for mixing fibers, the spinning preparation machine having a filling device for filling the spinning preparation machine with fibers, wherein the spinning preparation machine is designed as a slot mixer (1) having at least three slots (2, 3, 4, 5, 6, 7, 8) and the filling device having a fiber material inlet (20) and a delivery air outlet (22) and a distribution conduit (25) guiding the fiber material inlet (20) through the at least three slots (2, 3, 4, 5, 6, 7, 8) to the delivery air outlet (22), characterized in that, The slots (2, 3, 4, 5, 6, 7, 8) are surrounded by airless sidewalls (9, 10, 11, 12, 13, 14, 15, 16, 17, 18) and the distribution conduit is surrounded by airless conduit walls (27, 28, 29) on at least three sides. The first sensor (30) and the second sensor (31) for full-state measurement of the spinning preparation machine are only located in the slot (2) closest to the air delivery outlet (22), and the second sensor (31) is arranged closer to the distribution conduit (25) than the first sensor (30).
2. The spinning preparation machine as described in claim 1, characterized in that, The first sensor (30) and the second sensor (31) are arranged at the upper third of the slot (2) closest to the air delivery outlet (22).
3. The spinning preparation machine as described in claim 2, characterized in that, The second sensor (31) is positioned at a minimum distance (34) of not less than 200 mm from the distribution conduit (25).
4. The spinning preparation machine according to any one of claims 1-3, characterized in that, The first sensor (30) has a distance (35) of at least 200 mm from the second sensor (31).
5. The spinning preparation machine as described in any one of claims 1-4, characterized in that, The third sensor (32) for measuring the empty state is located below the slot (8) closest to the fiber material inlet (20).
6. The spinning preparation machine according to any one of claims 1-5, characterized in that, The sensors (30, 31, 32, 33) are designed as light-blocking plates.
7. The spinning preparation machine according to any one of claims 1-6, characterized in that, At least the second sensor (31) has a redundant design.
8. A method for filling a spinning preparation machine having a controller, the spinning preparation machine being designed according to any one of claims 1-7, characterized in that, During the time interval between the arrival of the fiber material at the first sensor (30) and the departure of the fiber material from the first sensor (30) or the arrival of the fiber material at the second sensor (31), the controller begins to reduce the filling of the spinning preparation machine.
9. The method as described in claim 8, characterized in that, Upon reaching the first sensor (30), a full-state level alarm is output by the controller.
10. The method as described in claim 8 or 9, characterized in that, When the second sensor (31) is reached, an overfill alarm is output by the controller.