Method for controlling supply air pressure of a woom system having a plurality of air-jet woom, system for controlling supply air pressure of a

Abstract

In a method for regulating a supply air pressure (pV) of a loom system (1) having a plurality of air-jet looms (2) each having a plurality of pneumatic loads (5) for introducing weft threads, a pressure demand (pB) of the air-jet looms (2) is ascertained by means of a central control unit (4), and the supply air pressure (pV) is set as a function of the ascertained pressure demand (pB). In this case, during the weaving process, for each of the air-jet looms (2), the current pressure demand (pB) of the respective maximum load (5) is determined from a plurality of the pneumatic loads (5) in a predefined time interval, and the current maximum pressure demand (pB) of all the loads (5) is determined by the control unit (4). Likewise, a current inlet pressure (pE) is measured at each of the air-jet looms (2), and a current lowest measured inlet pressure (pEmin) of all the air-jet looms (2) is determined by means of the control unit (4). The supply air pressure (pV) is increased if the lowest measured inlet pressure (pEmin) is below the maximum pressure demand (pBmax) for all loads (5), or the supply air pressure (pV) is reduced if the lowest measured inlet pressure (pEmin) is greater than the maximum pressure demand (pBmax) for all loads (5).

Description

Technical Field

[0001] The invention relates to a method for regulating the supply air pressure of a weaving machine having a plurality of air-jet weaving machines, each of which has a plurality of pneumatic loads for inserting weft threads, wherein the pressure requirements of the air-jet weaving machines are detected by means of a central control unit and the supply air pressure is set according to the detected pressure requirements. The invention also relates to a system for regulating the supply air pressure of such a weaving machine and a corresponding weaving machine. Background Art

[0002] Air jet looms have a large number of pneumatic loads, such as main nozzles, relay nozzles, selvedge inserts and other loads, in order to introduce the weft and, if necessary, also for other functions. Therefore, the air jet loom must be connected to a compressed air supply, which always guarantees a sufficiently high compressed air level for all pneumatic loads of the loom. It is also important that the individual loads accurately obtain the air pressure they need in order to introduce the weft correctly in time. For example, it is necessary to set different pressures according to the type of weft yarn in order to ensure a constant weft flight time and thus correct weft insertion as much as possible. Otherwise, the weft that arrives at the end of the weft insertion channel not only too early, but also too late may cause weaving errors. Similarly, different pressures may be required at different looms of the loom device, for example if these looms produce different fabrics.

[0003] In order to supply a plurality of air-jet weaving machines of a weaving machine installation with compressed air, it is known from DE 195 17 748 A1 to assign to each weaving machine a dedicated compressor and regulating means for setting a specific operating mode.

[0004] However, a plurality of air jet looms of a loom device are usually supplied by a central compressed air system, and all or at least a plurality of looms are connected to the central compressed air system. Here, a supply pressure is generated by a central compressed air source and distributed to each loom. Here, the correct pressure level is set for the pneumatic load respectively by a pressure reducer and / or a pressure regulating valve, which are assigned to each loom and are also partially assigned to each individual load. The supply pressure of the central compressed air supply is always set so high here that even in the case of considering pipeline losses and other losses, the loom requiring the highest pressure can also be reliably supplied. Therefore, it is very energy-consuming to supply compressed air to the air jet loom. Since the pressure level of the pneumatic load is usually adjusted during the weaving process, other problems are generated. Usually, too high a supply pressure is then supplied to the loom and / or the load, and then the supply pressure must be reduced by a pressure regulating valve. This has led to unnecessary high compressed air consumption and therefore energy consumption.

[0005] JP H03-104962A has therefore proposed a control unit for a loom system, which is able to automatically adapt the supply pressure in the case of a central compressed air supply. Each loom has a pressure regulator, which reports the set pressure for the input nozzle as a control value to the control unit. The control unit thus determines the maximum pressure value. In order to compensate for possible pressure losses, a fixed correction value is also added to this maximum pressure value. The control unit then compares the minimum required pressure thus obtained with the central supply pressure of the compressor. This central supply pressure is acquired by a sensor in the main compressed air tank and is also transmitted to the control unit. The supply air pressure is then variably adapted to the corresponding minimum required pressure. Summary of the invention

[0006] The object of the present invention is to provide a method for regulating the supply air pressure of a weaving machine, which method can also achieve further energy saving. In addition, a corresponding system for regulating the supply air pressure of such a weaving machine and a corresponding weaving machine should be provided.

[0007] In a method for regulating the supply air pressure of a weaving machine having a plurality of air-jet weaving machines, each of which has a plurality of pneumatic loads for inserting weft threads, the pressure requirements of the air-jet weaving machines are acquired by means of a central control unit, and the supply air pressure is set according to the acquired pressure requirements. The invention also relates to a system for regulating the supply air pressure of such a weaving machine and a corresponding weaving machine.

[0008] In the method, it is proposed that during the weaving process

[0009] for each of the air-jet weaving machines, acquiring, within a predetermined time interval, a current pressure requirement of a respective maximum load from a plurality of the pneumatic loads,

[0010] - comparing the pressure requirements of the respective maximum loads of the air jet weaving machine by means of the control unit and obtaining the current highest pressure requirement of all loads,

[0011] - measuring the current inlet pressure at each of the air-jet weaving machines at predefined time intervals and transmitting it to the control unit,

[0012] - comparing the measured inlet pressures of the air-jet weaving machines by means of a control unit and determining the current lowest measured inlet pressure of all air-jet weaving machines,

[0013] - and if the lowest measured inlet pressure is lower than the highest pressure requirement of all loads, then increase the supply air pressure, or if the lowest measured inlet pressure is higher than the highest pressure requirement of all loads, then decrease the supply air pressure.

[0014] Here, usually at the beginning of the weaving process, the pressure or pressure demand of each load is set by the operator depending on the corresponding application and the corresponding loom. It is feasible here that the pressure demand is then kept constant during the weaving process. However, each pressure demand can also change during the weaving process according to the type and embodiment of the loom, so as to be able to adapt to the current given conditions. It is also feasible to change each pressure demand by interweaving functions (Bindungsfunktionen) according to the corresponding pattern. Since the pressure demand of each single load is now obtained in a predetermined time interval according to the present invention, the load with the current highest pressure demand of all loads can be obtained at each time point, and then the supply air pressure is set accordingly. "In a predetermined time interval" can mean that a predetermined time period, such as 2s, is predetermined, and the pressure demand is obtained respectively after this time period. However, it is also possible to predetermine a predetermined number of weft insertions, and the pressure demand is obtained respectively according to it. In this case, because the duration of weft insertion is also constant under the condition of a constant loom speed, the pressure demand is then also obtained in a predetermined time interval. This makes it possible to adapt the supply pressure even more precisely to the pressure required for the maximum load and achieve further energy savings. In contrast, in the prior art only the pressure provided at the inlet nozzle is taken into account.

[0015] Furthermore, the measurement of the inlet pressure at each of the air-jet weaving machines at predetermined time intervals also contributes to energy saving. As a result, the pressure loss due to line losses and leaks is known precisely at each time point and for each weaving machine and can then be taken into account accordingly when setting the supply air pressure. As a result, a safety factor, which often also leads to an unnecessarily high supply air pressure, is not necessarily required or can at least be very low.

[0016] In the context of the present application, a "weaving process" is understood to be a continuous production process which begins after the pressure requirement has been set by the operator and ends as soon as the operator re-intervenes and changes at least one of the settings for the pressure requirement. This means that not only subsequent optimization of the pressure requirement, but also a change of yarn, a change of speed, a change of width or a change of fabric also lead to a new weaving process. On the other hand, automatic adjustments by the loom do not belong to this.

[0017] The advantages mentioned can also be achieved with a system for regulating the supply air pressure in a weaving machine having a plurality of air-jet weaving machines and a corresponding weaving machine. Protection is therefore also required for the system and the weaving machine.

[0018] The system for regulating the supply air pressure has a central control unit for detecting the pressure requirement of the air jet loom and for setting the supply air pressure according to the detected pressure requirement. The control unit is designed to carry out the described method and has at least one comparison device for detecting the highest pressure requirement of all loads, the lowest inlet pressure of all air jet looms and for comparing the lowest measured inlet pressure with the highest pressure requirement of all loads. The control unit can have one or more comparison devices for this purpose.

[0019] The loom device has: a plurality of air jet looms, each of which has a plurality of pneumatic loads for inserting weft threads, a detection device for detecting the pressure requirements of a plurality of pneumatic loads among the pneumatic loads, and a sensor for measuring the inlet pressure; a compressed air system to which the air jet looms are connected and to which the supply air pressure is applied; a central control unit for obtaining the highest pressure requirement of the air jet looms; and a compressor having a compressor controller, the compressor controller being used to set the supply air pressure according to the obtained highest pressure requirement. The loom device has a system as described above, the control unit of which is connected to at least one detection device and to at least one sensor for measuring the inlet pressure of each air jet loom and to the compressor controller of the compressor.

[0020] The detection device can be, for example, a regulating unit of an air-jet loom, which sets or regulates the pressure or pressure requirement of a load of the air-jet loom. Even if the regulating unit does not regulate the pressure in every case, but only occasionally sets, i.e. controls, the term "regulating unit" is used within the framework of the present application. Alternatively, however, the detection device can also be a pressure sensor, which is arranged directly at the load of the air-jet loom and measures the pressure of the load.

[0021] In the method, it is advantageous if the pressure requirement of the respective maximum load of each air-jet loom is detected by the regulating unit of the air-jet loom and transmitted to the central control unit. In this case, only the pressure value of each air-jet loom needs to be transmitted to the central control unit. This reduces the amount of data to be transmitted. Furthermore, the electronic pressure regulation that is already present in modern air-jet looms can be used for this purpose.

[0022] In a weaving machine installation, it is correspondingly advantageous if each of the air-jet weaving machines has a regulating unit which detects the pressure requirement of the maximum load of the pneumatic loads of the air-jet weaving machine and transmits it to the central control unit.

[0023] However, according to an alternative embodiment of the method, it is also possible that all pressure requirements of the loads of the respective air-jet weaving machines are transmitted from the regulating unit to the central control unit and that the central control unit detects the pressure requirement of the respective maximum load of each air-jet weaving machine.

[0024] As already described, alternatively, a pressure sensor can also be provided as a detection device at the pneumatic load of the air jet loom, and the pressure sensor directly transmits the pressure demand of the corresponding load to the control unit. Here, at least one or more maximum loads of each air jet loom can be provided with a pressure sensor. In this case, in the method, the pressure sensor of each air jet loom transmits its pressure value to the central control unit, and the pressure demand of the corresponding maximum load of each air jet loom is obtained by the central control unit. If it is known which one or more loads have the highest pressure demand, it is not necessarily necessary to provide all loads of each air jet loom with a pressure sensor. It is sufficient that at each air jet loom in the air jet loom, one or more loads with the highest pressure demand are usually provided with a pressure sensor. But of course, it is also feasible that all relevant loads of each air jet loom are provided with a pressure sensor.

[0025] It is also advantageous in a weaving machine if the regulating unit of the air-jet weaving machine is designed to set or regulate the pressure requirement of the load during the weaving process. Such an electronic pressure regulation can, for example, very quickly adapt the pressure of the pre-nozzle and the main nozzle in order to achieve the correct thread arrival. Such pressure changes can also be taken into account in that the regulating unit of the air-jet weaving machine transmits the respective current pressure value or pressure requirement to the central control unit.

[0026] In the method, it is correspondingly advantageous if the load, in particular the pressure requirement of the pre-nozzle and / or the main nozzle, is automatically adapted during the weaving process by a regulating unit of the air-jet weaving machine.

[0027] It is also possible to automatically adapt the pressure requirements of the relay nozzle and / or the stretching nozzle during the weaving process by means of a control unit of the air-jet weaving machine. This can include, as already described, switching between different pressure levels. For example, different pressure levels can be predefined for the trim and the terry area during terry weaving, and switching between these pressure levels can be automatically performed by interlacing. The control unit then sets the predefined pressure level in each case.

[0028] In the method, it is further advantageous if a target value for the supply air pressure is generated by a central control unit and is pre-assigned to the compressor controller. The system in this case only comprises an interface to the compressor controller and can be used with different compressors. Alternatively, however, it is also possible for the control unit itself to control the compressor or to comprise a compressor controller. In the simplest case, the target value is equal to the pressure requirement of the current respective maximum load. However, it is advantageous if the target value also comprises a compensation value for compensating for pressure losses. Such pressure losses are known from the measurement of the inlet pressure of the air-jet loom.

[0029] It is particularly advantageous to generate a target value for the supply air pressure from the highest pressure demand of all loads, the lowest measured inlet pressure and a safety value. The safety value can also be used to intercept, for example, short-term pressure fluctuations in the supply air pressure which could otherwise lead to a drop below a minimum inlet pressure in one of the air-jet weaving machines and thus to a stoppage of the weaving machine.

[0030] It is also advantageous to set the pressure requirement of the load before the weaving process begins. This setting is preferably performed by an operator. It is particularly advantageous to set the pressure requirement of the relay nozzle and / or the stretching nozzle by the operator according to the requirements of the current application.

[0031] In the method, it is also advantageous that the pressure demand of the pneumatic load of the air jet loom and / or the pressure demand of the corresponding maximum load of the air jet loom and / or the highest pressure demand of all loads and / or the inlet pressure of the air jet loom are obtained when the fabric is changed before the weaving process begins, and the compressed air supply of the loom device is optimized according to the obtained pressure demand and / or inlet pressure. It is thus possible to perform a simulation when the fabric is changed and to investigate the influence of the change on the compressed air supply. Then, depending on the results of the simulation, the production can be planned in such a way that the least possible compressed air consumption and the least possible line losses occur. For example, a specific application can be planned for a specific time point, or a specific application with a high pressure demand can be planned on a loom closer to the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Further advantages of the present invention are described in the following examples. Schematically:

[0033] Figure 1 An air jet loom with multiple pneumatic loads for inserting weft threads is shown,

[0034] Figure 2 A loom installation having a plurality of air jet looms and a system for regulating the supply air pressure is shown, and

[0035] Figure 3A diagram showing a method for regulating supply air pressure according to a specific example. DETAILED DESCRIPTION

[0036] In the following description of the exemplary embodiments, identical features or at least similar features in their design and / or mode of operation are provided with the same reference numerals. Furthermore, these features are only explained in detail when they are first mentioned, while in the subsequent exemplary embodiments only the differences with respect to the exemplary embodiments already described are discussed. Furthermore, for reasons of clarity of a plurality of identical components or features, usually only one or only some components or features are labeled.

[0037] Figure 1 An air jet loom 2 with a plurality of pneumatic loads 5 is shown in a schematic overview. The air jet loom 2 has one or more warp beam systems, an opening mechanism, a drawing device and a cloth winding roller in a conventional manner, but they are not shown here. Only the components of the air jet loom 2 that are involved in the weft insertion are shown. These components contain one or more yarn feed drums 18 in a conventional manner, from which the weft thread 17 is unwound and fed to a prewinding machine 19. From there, the weft thread 17 is extended to the weft insertion mechanism of the air jet loom 2 through a balloon limiter 20. With the help of the weft insertion mechanism, the weft thread 17 is respectively introduced into an open shed (not shown) and is beaten up with the help of a reed 21. In order to separate the weft thread 5 after successful weft insertion, a separation mechanism 22 is arranged on the introduction side. Optionally, as shown here, the separation mechanism 22 can also be arranged on the side opposite to the introduction side.

[0038] The weft insertion mechanism is pneumatically designed in this case and comprises a main nozzle 10 and a pre-nozzle 9 arranged on the insertion side of the air-jet loom 2 and capable of being loaded with compressed air. The weft thread 17 is introduced into the insertion channel 24 of the reed 21 by means of the main nozzle 10 and the pre-nozzle 9. The further transport of the weft thread 17 through the insertion channel 24 is supported by a plurality of relay nozzles 11 distributed on the reed 21, which also work pneumatically and can be loaded with compressed air for this purpose.

[0039] On the side of the air-jet loom 2 facing away from the insertion side, according to this view, a stretching nozzle 13 is also provided which is pneumatically operated with compressed air and which keeps the weft thread 17 introduced into the shed stretched until the beat-up. In the case shown here, the weft thread 17 is introduced straight and received by the stretching nozzle 13. In addition, in the current air-jet loom 1, inserts 14 are arranged on both sides of the shed, which inserts the ends of the introduced weft thread 17 into the subsequently opened shed. According to the view shown here, the insert 14 is also a pneumatic insert 14 and can be acted upon with compressed air.

[0040] A valve 25 is provided for controlling the pneumatic load 5, which is controlled by the regulating unit 6 of the air jet loom 2, as indicated by the dashed line. The pneumatic load 5 is connected to the textile plant or the loom system 1 (see Figure 2 ) is connected to a compressed air system 3. In this context, a plurality of relay nozzles 11 are each combined into a nozzle group, which is actuated by a common valve 25. In order to reliably supply the relay nozzles 11 with compressed air and to compensate for pressure fluctuations, the relay nozzles 11 are connected to the compressed air system 3 via a relay nozzle tank 12. The air jet loom 2 also has a sensor 16 for measuring an inlet pressure pE at the air jet loom 2.

[0041] In this example, the regulating unit 6 is configured as an electronic pressure regulating unit and provides the required pressure for each pneumatic load in the pneumatic load 5. The pressure required by each load 5 is usually determined as a pressure demand pB by the operator according to the requirements of the corresponding fabric or the corresponding application for each load 5 at the beginning of the weaving process and input to the air jet loom 2. The input pressure demand pB can then remain constant in other weaving processes. In particular, it is advantageous for the pre-nozzle 9 and the main nozzle 10 to change the required pressure or the pressure demand pB according to the flight time of the silk thread by the regulating unit 6, and thus adjust the silk thread arrival. This is described in EP 1260622 B1, for example, and this document is explicitly referred to here.

[0042] In order to adjust and adapt the supply pressure pV (see Figure 2 ), the inlet pressure pE is now measured from the air jet loom 2 at predetermined time intervals and transmitted to the central control unit 4 (see Figure 2 ). At least one pressure demand pB is also transmitted from each air-jet loom 2 to the central control unit 4. In this case, only the current corresponding highest pressure demand pB of the load 5 of the air-jet loom 2 can be transmitted by the control unit 6 in a predetermined time interval. Figure 3 This is shown in . However, according to other embodiments of the method, it is also possible to transmit a plurality or all pressure demands pB of the load 5 of the air-jet weaving machine 2 in predetermined time intervals.

[0043] Figure 2 1 shows a schematic diagram of a loom installation 1 having a plurality of air-jet looms 2 and a system for regulating the supply air pressure pV. The loom installation 1 comprises here four air-jet looms 2 with a plurality of pneumatic loads 5, such as they are arranged according to Figure 1As already described. The air jet loom 2 also has a sensor 16 for the inlet pressure pE as also already described and at least one detection device for detecting the pressure demand pB of the pneumatic load 5. In this context, the detection device is also formed by a regulating unit 6 for electronic pressure regulation in the air jet loom 2. However, in principle, it is also possible to set a pressure sensor as a detection device at each of the most important loads 5. In addition, the loom device 1 includes a compressed air system 3, which has a central compressor 7 for generating a supply air pressure pV, a compressor controller 8, and a compressed air tank 26 for compensating pressure fluctuations. Compressed air is supplied to each air jet loom 2 via a pressure line 23.

[0044] The system for regulating the supply air pressure pV comprises a central control unit 4, by means of which the maximum pressure demand pBmax of the air jet loom 2 is obtained, and the supply air pressure pV is set according to the obtained maximum pressure demand pBmax. The minimum inlet pressure pEmin of all air jet looms 2 is also obtained by means of the control unit 4. The control unit 4 has at least one comparison device 15 for this purpose. In this context, the control unit has a first comparison device 15 for the inlet pressures pE1, pE2, pE3 and pE4 of the air jet loom 2 and a second comparison device 15 for the corresponding maximum pressure demands pB1, pB2, pB3 and pB4 of the air jet loom 2. The sensor 16 of each air jet loom 2 and the detection device, here the regulating unit 6, are connected to the control unit 4 in a signal transmission manner, as indicated by the dotted arrow. Similarly, the control unit 4 is connected to the compressor controller 8 in a signal transmission manner.

[0045] According to Figure 3Taking the method explained again in more detail as an example, the current maximum pressure requirement pBmax of all loads 5 of the air jet looms 2 of the loom device 1 is now acquired by the control unit 4 at a predetermined time interval, for example every 2 seconds or after a predetermined number of weft insertions. According to the present example, for this purpose, the individual regulating units 6 of the air jet looms 2 respectively acquire their current maximum loads 5 and their pressure requirements pB and report them to the control unit 4. In this context, the pressure requirements pB1, pB2, pB3 and pB4 of the air jet looms 2 are transmitted to the control unit 4 accordingly. The comparison device 15 compares these transmitted pressure requirements pB and thereby determines the current maximum pressure requirement pBmax of all loads 5 of the loom device 1. Similarly, the inlet pressure pE at each air jet loom 2 is measured at a predetermined time interval, for example every 2 seconds, and is reported to the control unit 4 as inlet pressures pE1, pE2, pE3 and pE4. The inlet pressures pE1, pE2, pE3 and pE4 transmitted from the individual air-jet weaving machines 2 are compared by means of a further (or identical) comparison device 15 and the current respective minimum inlet pressure pEmin of the air-jet weaving machine 2 is determined therefrom.

[0046] The current lowest inlet pressure pEmin of the air-jet loom 2 is then compared with the current highest pressure requirement pBmax of the air-jet loom 2 or its load 5 by means of a further (or identical) comparison device 15, and a target value pVSoll is generated depending on the result of the comparison, which the control unit 4 predetermines to the compressor controller 8. In this case, the supply air pressure pV is increased if the lowest measured inlet pressure pEmin is below the highest pressure requirement pBmax of all loads 5. Likewise, the supply air pressure pV is reduced if the lowest measured inlet pressure pEmin is greater than the highest pressure requirement pBmax of all loads 5.

[0047] It can thereby be ensured that, for example, air-jet looms 2 which are further away from the compressor also obtain a sufficiently high inlet pressure pE. By measuring the inlet pressure pE of each air-jet loom 1 and transmitting it to the control unit 4, the control unit can therefore also take into account and compensate for the line losses. However, at the same time, the supply air pressure pV can also be limited to the actual maximum required value, which results from the maximum pressure demand pBmax and the line losses known by measuring the inlet pressure pE. Since the lowest measured inlet pressure pEmin is continuously compared with the maximum pressure demand pBmax of all loads 5 during the weaving process, the supply air pressure pV in the compressed air system 3 can be set in an optimal manner at each point in time, thereby enabling significant energy savings to be achieved.

[0048] According to the present example, the target value pVSoll also contains a safety value S, which is taken into account by the control unit 4 when generating the target value pVSoll. Each of the air-jet looms 2 requires a minimum inlet pressure, below which a shutdown of the air-jet loom 2 is forced. The safety value S can ensure that small, short-term fluctuations in the supply pressure pV do not lead to a shutdown of the air-jet loom 2. However, it is also possible in principle to work without such a safety value.

[0049] Likewise, it is also possible to deviate from the method shown here and for the control unit 6 of the air-jet loom 2 to transmit not only the pressure demand pB of the respective maximum load 5 of these air-jet looms, but also the pressure demand pB of all loads 5 of these air-jet looms. The pressure demand pB of the respective maximum load of each loom is then acquired by the central control unit 4.

[0050] according to Figure 3 The example of also illustrates once again the method for setting the supply air pressure. A weaving machine installation 1 is shown, which in this case has six air-jet weaving machines 2. Each of the air-jet weaving machines 2 in this case has five pneumatic loads 5.

[0051] For each of the air-jet weaving machines 2, the individual pressure requirements pB of the individual loads 5 are shown, which are here the two relay nozzle tanks 12, the stretching nozzle 13, the insert 14 as well as the pre-nozzle 9 and the main nozzle 10 (see Figure 1 ). For the air jet looms 2, the pressure demand pB of their maximum load 5 is obtained and transmitted to the central control unit 4. The pressure demand pB of the corresponding maximum load 5 of each air jet loom of the loom 2 is circled and marked accordingly. Similarly, the inlet pressure pE is obtained for each air jet loom in the air jet loom 2 and transmitted to the control unit 4. Finally, as already described, the control unit 4 obtains the corresponding highest pressure demand pBmax of all loads 5 of the air jet loom 2 from the transmitted pressure demand pB. In this article, the highest pressure demand is the pressure demand pB of 5.0 bar (bar) of the stretching nozzle 13 of the air jet loom with sequence number 4, which is shown in bold for identification. On the contrary, the lowest inlet pressure pEmin is measured with 5.8 bar for the loom with sequence number 6, and is also shown in bold for the sake of clarification. Therefore, even at the air jet loom 2 with the lowest inlet pressure pEmin, the inlet pressure pE with 5.8 bar is always significantly higher than the pressure demand pBmax with 5.0 bar of the maximum load.

[0052] Therefore, the control unit 4 predetermines, according to the first embodiment of the method, a reduction in the supply pressure pV to the compressor 7. In this case, the compressor 7 can predetermine, for example, a pressure of 5 bar as a target value pVSoll. In this case, the target value pVSoll corresponds exactly to the acquired pressure requirement pBmax of the maximum load.

[0053] However, since the inlet pressure pE is known from all air-jet looms 2, the control unit 4 can also calculate the maximum pressure loss in the compressed air system and, according to a preferred embodiment of the method, also take this into account when generating the target value pVSoll. In the present example, since only an inlet pressure pE of 5.8 bar can still be measured at the loom number 6, the maximum pressure loss in the system is 0.2 bar. Taking into account the maximum pressure loss in the compressed air system 3, the control unit 4 in this case predetermines a pressure of 5.2 bar to the compressor 7 as the target value pVSoll.

[0054] In a further development of the preferred method, it can also be taken into account at which of the air-jet looms 2 the greatest pressure loss occurs. In this case, the maximum pressure loss can only be taken into account if the load 5 with the highest pressure demand pBmax of all the loads 5 of the air-jet looms 2 is also simultaneously located at the air-jet loom 2. In this context, this would be the case if the pressure demand pB of the relay nozzle tank number 2 of the loom number 6 had a highest pressure demand pBmax of 5.0 bar. However, since in this example the highest pressure demand pBmax with 5.0 bar occurs at the loom number 4, the maximum pressure loss does not have to be compensated accordingly in this specific example.

[0055] However, all three described embodiments of the method can be implemented as described in Figure 2 As described, a fixed safety value S is taken into account when generating the target value.

[0056] The loom system can therefore always be operated at an optimal pressure level, thereby significantly reducing the energy consumption for generating compressed air. For example, a total saving of 10% can be achieved with a reduction in inlet pressure of approximately 1 bar. This includes not only savings in generating compressed air, but also a reduction in leakage losses.

[0057] Further variants within the scope of the claims are also possible, such as any desired combination of the described features, even if these are shown and described in different parts of the description or the claims or in different embodiments, as long as this does not conflict with the teaching of the independent claims.

[0058] List of reference numerals:

[0059] 1Loom equipment

[0060] 2 Air jet loom

[0061] 3. Compressed air system

[0062] 4Central Control Unit

[0063] 5 Pneumatic load

[0064] 6 Adjustment unit

[0065] 7. Compressor

[0066] 8Compressor controller

[0067] 9 Pre-nozzle

[0068] 10 Main Nozzles

[0069] 11 Relay Nozzles

[0070] 12 relay nozzle tank

[0071] 13 Stretch Nozzle

[0072] 14 Inserts

[0073] 15 Comparison Device

[0074] 16 Sensor for inlet pressure

[0075] 17th Latitude

[0076] 18 Yarn feeding drum

[0077] 19 Pre-rolling machine

[0078] 20 air ring limiter

[0079] 21 Weaving reed

[0080] 22 Separation mechanism

[0081] 23 Pressure pipeline

[0082] 24Introduction channel

[0083] 25 valves

[0084] 26 Compressed air storage tanks

[0085] S safety value

[0086] pV Supply Air Pressure

[0087] pE inlet pressure

[0088] pE1 Inlet pressure of the first air jet loom

[0089] pE2 Inlet pressure of the second air jet loom

[0090] pE3 Inlet pressure of the third air jet loom

[0091] pE4 Inlet pressure of the fourth air jet loom

[0092] pB pressure requirement

[0093] pB1 Highest pressure requirement for the first air-jet weaving machine

[0094] pB2 Highest pressure requirement for the second air-jet loom

[0095] pB3 Highest pressure requirement for third air jet loom

[0096] pB4 Maximum pressure requirement for the fourth air jet loom

[0097] pBmax Maximum pressure requirement for all loads

[0098] pEmin minimum measured inlet pressure

[0099] pVSoll Target value for supply air pressure.

Claims

1. A method for regulating the supply air pressure (pV) of a weaving machine (1) having a plurality of air-jet weaving machines (2), each of which has a plurality of pneumatic loads (5) for inserting weft threads (17), in, The pressure requirement (pB) of the air jet loom (2) is acquired by means of a central control unit (4), and the supply air pressure (pV) is set according to the acquired pressure requirement (pB), It is characterized in that during the weaving process - for each of the air-jet weaving machines (2), acquiring, at a predetermined time interval, from a plurality of the pneumatic loads (5), a current pressure requirement (pB) of the corresponding maximum load (5), - comparing the pressure requirements (pB) of the respective maximum loads (5) of the air jet loom (2) by means of the control unit (4) and obtaining the current highest pressure requirement (pB) of all loads (5), - measuring the current inlet pressure (pE) at each of the air-jet looms (2) at predetermined time intervals and transmitting it to the control unit (4), - comparing the measured inlet pressures (pE) of the air-jet looms (2) by means of the control unit (4) and determining the current lowest measured inlet pressure (pEmin) of all air-jet looms (2), - and if the lowest measured inlet pressure (pEmin) is lower than the highest pressure requirement (pBmax) of all loads (5), then increasing the supply air pressure (pV), or if the lowest measured inlet pressure (pEmin) is greater than the highest pressure requirement (pBmax) of all loads (5), then decreasing the supply air pressure (pV).

2. The method according to the preceding claim, characterized in that The pressure requirement (pB) of the respective maximum load (5) of each air-jet loom (2) is detected by the regulating unit (6) of the air-jet loom (2) and transmitted to the central control unit (4).

3. The method according to claim 1, characterized in that A target value (pVSoll) for the supply air pressure (pV) is generated by the central control unit (4) and is predefined to a compressor controller (8).

4. The method according to the preceding claim, characterized in that A target value (pVSoll) for the supply air pressure (pV) is generated from the highest pressure demand (pB) of all loads (5), the lowest measured inlet pressure (pE) and a safety value (S).

5. The method according to claim 1, characterized in that During the weaving process, the pressure requirement (pB) of the consumer (5), in particular of the pre-nozzle (9) and / or the main nozzle (10), is automatically adapted by a regulating unit (6) of the air-jet weaving machine (2).

6. The method according to claim 1 or 5, characterized in that: Before the weaving process begins, a pressure requirement (pB) of the load (5), in particular of the relay nozzle (11) and / or the stretching nozzle (13), is set.

7. The method according to claim 1, characterized in that The pressure requirement (pB) of the load (5) of each air jet loom (2) is transmitted to the central control unit (4), and the pressure requirement (pB) of the corresponding maximum load (5) of each air jet loom (2) is obtained by the central control unit (4).

8. The method according to claim 1, characterized in that When the fabric is changed before the weaving process starts, the pressure demand (pB) of the pneumatic load (5) of the air jet loom (2) and / or the pressure demand (pB) of the corresponding maximum load (5) of the air jet loom (2) and / or the highest pressure demand (pB) of all loads (5) and / or the inlet pressure (pE) of the air jet loom (2) are obtained, and the compressed air supply of the loom device (1) is optimized according to the obtained pressure demand (pB) and / or inlet pressure (pE).

9. A system for regulating the supply air pressure (pV) in a weaving machine (1) having a plurality of air-jet weaving machines (2), each of which has a plurality of pneumatic loads (5) for inserting weft threads (17), in, The system comprises a central control unit (4) for acquiring a pressure requirement (pB) of the air jet loom (2) and for setting the supply air pressure (pV) according to the acquired pressure requirement (pB). characterised in that the control unit (4) is designed to execute the method according to any one of claims 1 to 8, The control unit (4) has at least one comparison device (15) for determining the maximum pressure requirement (pBmax) of all loads (5) of all air-jet looms (2), the minimum inlet pressure (pE) of all air-jet looms (2), and for comparing the minimum measured inlet pressure (pEmin) with the maximum pressure requirement (pBmax) of all loads (5).

10. A loom device (1), comprising: A plurality of air-jet looms (2), each of which has a plurality of pneumatic loads (5) for inserting weft threads (17), at least one detection device for detecting the pressure requirements (pB) of a plurality of the pneumatic loads (5), and at least one sensor (16) for measuring the inlet pressure (pE); a compressed air system (3), to which the air jet loom (2) is connected and which is loaded with a supply air pressure (pV); A central control unit (4), the central control unit being used to obtain a maximum pressure requirement (pBmax) of the air jet loom (2); a compressor (7) having a compressor controller (8) for setting said supply air pressure (pV) according to the obtained maximum pressure demand (pBmax); as well as According to the system of claim 9, the control unit (4) of the system is connected to the at least one detection device and to at least one sensor (16) of each air-jet loom (2) and to a compressor controller (8) of the compressor (7).

11. A weaving machine (1) according to the preceding claim, characterised in that Each of the air-jet weaving machines (2) has a regulating unit (6) which detects the pressure requirement (pB) of the maximum load (5) of the pneumatic loads (5) and transmits it to the central control unit (4).

12. A loom device (1) according to the preceding claim, characterised in that The regulating unit (6) of the air-jet weaving machine (2) is designed to set or regulate the pressure requirement (pB) of the load (5) during the weaving process.

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