A low-energy consumption yarn oiling device and oiling method thereof

Abstract

The present invention relates to the technical field of textile equipment, and in particular to a low-energy yarn oiling device and an oiling method thereof, wherein the low-energy yarn oiling device comprises a yarn oil supply pump, a temperature control channel, an oil delivery device and a yarn conveying device, the yarn oil supply pump is provided with an oil inlet and an oil outlet, the oil delivery device comprises an oil delivery pipe and a rotating motor, an oil delivery cavity is provided in the oil delivery pipe, an oil delivery outlet is provided on the oil delivery pipe, an oil delivery inlet is provided on the oil delivery pipe, a spiral conveying shaft is provided in the oil delivery cavity, a turntable supporting the spiral conveying shaft is provided at both ends of the spiral conveying shaft, a rotating trough body is provided on the oil delivery pipe, a magnetic disc body is provided on the output shaft of the rotating motor, and the yarn conveying device comprises a transverse oil passage and a longitudinal wire passage, and the oil passage intersects and communicates with the wire passage. It solves the technical problems that partial oiling of yarn and precise oiling on demand cannot be achieved in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of textile equipment, and in particular to a low-energy consumption yarn oiling device and an oiling method thereof. Background Art

[0002] At present, in the field of textile technology, many yarns require oiling during production. At present, an oiling wheel is used for roller coating, such as the yarn oiling device disclosed in Chinese Patent Publication No. CN107200240B, which includes a base, a side plate is provided on one side of the base, a gear box is provided on the side plate, and the gear box is driven by a corresponding power mechanism. An oil collecting pan is provided at the center of the top of the base, an oiling shaft is installed in the oil collecting pan, one end of the oiling shaft passes through the oil collecting pan and is connected to one of the output shafts of the gear box, and an oil immersion wheel is installed on the oiling shaft; a wire seat is installed on the top of one side of the oil collecting pan, and wire wheels are installed at both ends of the wire seat; an oil tank is installed on the top of the wire seat; an output shaft is installed on the base on the other side of the oil collecting pan, and an output wire wheel is provided on the output shaft; a slider is movably installed on the oil collecting pan between the output wire wheel and the oil immersion wheel, and an oil overflow cylinder is obliquely installed on the slider, and oil absorbing cotton is provided in the oil overflow cylinder. There is also a coating method that uses immersion, such as an improved yarn oiling machine disclosed in Chinese patent publication No. CN109355839B, which includes an immersion oiling device and an elastic deoiling device located on one side of the immersion oiling device, and the yarn passes through the immersion oiling device and the elastic deoiling device in sequence along the conveying direction; the immersion oiling device includes an oil tank with an opening on the top, and a yarn outlet guide roller and a yarn inlet guide roller are respectively arranged on the left and right sides of the top of the oil tank; the oil tank is also provided with an in-box guide mechanism that can move along the up and down direction of the oil tank; the oil tank is filled with oil, and the yarn passes around the upper part of the yarn inlet guide roller, the lower part of the in-box guide mechanism and the upper part of the yarn outlet guide roller in sequence along the conveying direction.

[0003] However, the above two methods cannot achieve more precise control, such as when the yarn is partially oiled. Moreover, the above two methods often use a large amount of oil, and there is no way to adjust the amount of oil as needed, and the energy consumption is also high. Summary of the invention

[0004] Therefore, in view of the above problems, the present invention proposes a low-energy consumption yarn oiling device, which solves the technical problems in the prior art that partial oiling of the yarn cannot be achieved and precise oiling on demand cannot be achieved.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A low-energy consumption yarn oiling device, used for oiling yarn, comprises a yarn oil supply pump, a temperature control channel for adjusting the temperature of the oil body, an oil delivery device connected to the temperature control channel and a yarn conveying device connected to the oil delivery device, the yarn oil supply pump is provided with an oil inlet connected to an external oil circuit and an oil outlet connected to the temperature control channel, the oil delivery device comprises an oil delivery pipe and a rotating motor, an oil delivery cavity is provided in the oil delivery pipe, an oil delivery outlet connected to the oil delivery cavity is provided on one axial end of the oil delivery pipe, an oil delivery inlet is provided on the side of the oil delivery pipe at one end away from the oil delivery outlet, a spiral delivery shaft is provided in the oil delivery cavity, Turntables supporting the spiral conveying shaft are respectively arranged at both ends of the spiral conveying shaft, a rotating groove body for accommodating the rotation of the turntable is arranged on the oil delivery pipe, a magnetic disk body is arranged on the output shaft of the rotating motor, and the magnetic disk body is magnetically connected with the turntable close to the magnetic disk body. When the rotating motor rotates, the magnetic disk body drives the spiral conveying shaft to rotate. The yarn conveying device includes a transverse oil passage and a longitudinal wire passage, the oil passage intersects and is connected with the wire passage, the oil passage is divided into an oil inlet end and an oil outlet end by the wire passage, the oil inlet end is connected with the oil delivery outlet, and the oil outlet end is connected with the oil inlet.

[0007] Furthermore, the oil inlet end is in the shape of a truncated cone, and the longitudinal cross-section of the oil inlet end gradually decreases from one end close to the oil pipeline to the other end, and the oil outlet end is in the shape of a truncated cone, and the longitudinal cross-section of the oil outlet end gradually increases from one end close to the oil pipeline to the other end.

[0008] Furthermore, the minimum longitudinal cross-section of the oil inlet end is the same as the minimum longitudinal cross-section of the oil outlet end, and the maximum longitudinal cross-section of the oil inlet end is greater than the maximum longitudinal cross-section of the oil outlet end.

[0009] Furthermore, an upper clamping wheel group for yarn guiding is arranged above the wire passing channel, and a lower clamping wheel group for yarn guiding is arranged below the wire passing channel, an upper cam roller is arranged between the upper clamping wheel group and the wire passing channel, and the upper cam roller is driven by an external upper cam motor, and the upper cam roller is pressed against the yarn when it rotates, and a lower cam roller is arranged between the lower clamping wheel group and the wire passing channel, and the upper cam roller is pressed against the yarn when it rotates, and the lower cam roller is driven by an external lower cam motor, and the upper cam roller and the lower cam roller are respectively located on both sides of the yarn.

[0010] Furthermore, oil-absorbing cotton is arranged on one side of the wire-passing channel, and an oil extraction pipe connected to the oil-absorbing cotton is arranged on the wire-passing channel. The oil extraction pipe is connected to an external negative pressure mechanism. When the upper cam roller does not press the yarn, the yarn does not contact the oil-absorbing cotton. When the upper cam roller presses the yarn by rotating, the yarn contacts the oil-absorbing cotton.

[0011] Furthermore, a heating mechanism is provided on the side of the temperature control channel close to the oil outlet, a cooling mechanism is provided on the side of the temperature control channel close to the oil delivery device, and a temperature sensor is provided on the temperature control channel between the heating mechanism and the cooling mechanism.

[0012] Furthermore, the temperature control channel is S-shaped, the temperature control channel has at least two turning parts, there are two temperature sensors, and there is at least one turning part between the two temperature sensors.

[0013] A low-energy consumption yarn oiling method based on the same inventive concept comprises the following steps:

[0014] In the first step, the oil is outputted by the yarn oil supply pump, passes through the temperature control channel to adjust the oil temperature, and then the oil is inputted into the oil delivery device;

[0015] In the second step, the yarn passes through the yarn passing channel of the yarn conveying device, and the oil is evenly output to the oil inlet end of the yarn conveying device by the oil delivery device, and the remaining oil is discharged from the oil outlet end;

[0016] In the third step, the oil discharged from the oil outlet is returned to the oil inlet.

[0017] Furthermore, the upper clamping wheel group and the lower clamping wheel group located outside the wire passing channel are used to realize the conveying of the yarn, the upper cam roller and the lower cam roller cooperate to realize the tension control of the yarn, and the oil-absorbing cotton arranged on the wire passing channel is used to realize the smearing and absorption of the yarn oil.

[0018] Furthermore, the oil outlet is in a negative pressure state, so that the oil is output from the oil inlet to the oil outlet.

[0019] By adopting the above technical solution, the beneficial effects of the present invention are:

[0020] 1. This solution realizes the output control of oil through the yarn oil supply pump, realizes the precise adjustment of oil temperature through the temperature control channel, realizes the precise and quantitative output of oil through the oil delivery device, and realizes the contact and coating of oil and yarn through the yarn conveying device. In the oil delivery device, the magnetic disk can be used to realize the effective control of the spiral conveying shaft, and the effective sealing of the oil delivery pipe can be realized, so as to realize the precise control of oil delivery. The coordinated setting of the wire passage and the oil passage can make the oil and the yarn adopt point contact, and the oil can realize the flow rate control through the oil delivery device, and the yarn can realize the control through the speed, so as to effectively adjust the effective control of the yarn coating oil amount. Among them, the oil outlet can adopt the form of negative pressure to realize the main lateral movement of the oil at the oil inlet, reduce the free entry of the oil into the oil passage, and only the yarn is coated with oil.

[0021] 2. The shape and size of the oil inlet and outlet can achieve better concentrated oil coating and better coating effect. The larger oil inlet and smaller oil outlet can achieve a short retention of oil at the intersection of the thread channel and the oil channel, so that the oil is absorbed by the yarn and the coating effect is better.

[0022] 3. The upper clamping wheel set and the lower clamping wheel set can realize the effective conveying and speed adjustment of the yarn. The upper cam roller and the lower cam roller can realize the effective tensioning of the yarn and adjust the inclination of the yarn to realize the micro-control during oiling. In addition, the setting of the oil-absorbing cotton can make use of the cooperation of the upper cam roller and the lower cam roller to make the yarn contact or not contact the oil-absorbing cotton, so as to realize the uniform application of oil and the removal of excess oil.

[0023] 4. The heating mechanism can heat the oil, and the temperature sensor can measure the oil temperature. When the temperature is too high, the cooling mechanism can be used for fine-tuning. When the oil is too low, the heating mechanism can be adjusted to increase the temperature. In addition, the temperature control channel is set in an S shape, and the two temperature sensors can be used to better measure the temperature. In addition, the two temperature sensors can also be used to sense whether the oil is sufficient. When the oil is insufficient, the two temperature sensors will produce a temperature difference. When the difference exceeds the rated temperature, a signal will be sent.

[0024] 5. A low-energy yarn oiling method, which achieves better oiling control through the cooperation of a yarn oil supply pump, a temperature control channel, an oil delivery device, and a yarn conveying device, with low energy consumption, high precision, and good control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 It is a structural diagram of the oil transfer device.

[0027] Figure 3 It is a structural schematic diagram of the coordination between the wire-passing channel and the upper clamping wheel group and the lower clamping wheel group.

[0028] Figure 4 yes Figure 3 Schematic diagram of the structure in working state.

[0029] Reference numerals:

[0030] 1. Yarn oil supply pump; 11. Oil inlet; 12. Oil outlet;

[0031] 2. Temperature control channel; 21. Heating mechanism; 22. Cooling mechanism; 23. Temperature sensor; 24. Turning part;

[0032] 3. Oil delivery device; 31. Oil delivery pipe; 311. Oil delivery chamber; 312. Oil delivery outlet; 313. Oil delivery inlet; 314. Screw delivery shaft; 315. Turntable; 316. Oil through hole; 317. Rotating tank; 32. Rotating motor; 321. Magnetic disk;

[0033] 4. Yarn conveying device; 41. Oil passage; 42. Thread passage; 411. Oil inlet; 412. Oil outlet; 43. Oil absorbing cotton; 44. Oil extraction pipe;

[0034] 51. Upper clamping wheel set; 52. Lower clamping wheel set; 53. Upper cam roller; 54. Lower cam roller;

[0035] 6. Yarn. DETAILED DESCRIPTION

[0036] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0037] refer to Figures 1 to 4 The present embodiment provides a low-energy consumption yarn oiling device for oiling yarn, comprising a yarn oil supply pump 1, a temperature control channel 2 for adjusting the temperature of the oil body, an oil delivery device 3 connected to the temperature control channel 2, and a yarn conveying device 4 connected to the oil delivery device 3. The yarn oil supply pump 1 is provided with an oil inlet 11 connected to an external oil circuit and an oil outlet 12 connected to the temperature control channel 2. The oil delivery device 3 comprises an oil delivery pipe 31 and a rotating motor 32. An oil delivery cavity 311 is provided in the oil delivery pipe 31. The oil delivery pipe 31 has an oil delivery cavity 311. An oil delivery outlet 312 connected to the oil delivery chamber 311 is provided at one axial end, an oil delivery inlet 313 is provided on the side of the oil delivery pipe 31 away from the oil delivery outlet 312, a screw conveying shaft 314 is provided in the oil delivery chamber 311, and a turntable 315 supporting the screw conveying shaft 314 is provided at both ends of the screw conveying shaft 314, a rotating groove 317 for accommodating the rotation of the turntable 315 is provided on the oil delivery pipe 31, and an oil through hole 316 is provided on the turntable 315 close to the oil delivery outlet 312 to realize the circulation of oil. A magnetic disk 321 is provided on the output shaft of the rotating motor 32, and the magnetic disk 321 is magnetically connected to the turntable 315 close to the magnetic disk 321. When the rotating motor 32 rotates, the magnetic disk 321 drives the spiral conveying shaft 314 to rotate. The yarn conveying device 4 includes a transverse oil passage 41 and a longitudinal wire passage 42. The oil passage 41 intersects and is connected with the wire passage 42. The oil passage 41 is divided into an oil inlet end 411 and an oil outlet end 412 by the wire passage 42. The oil inlet end 411 is connected to the oil delivery outlet 312, and the oil outlet end 412 is connected to the oil inlet 11.

[0038] The oil inlet end 411 is in the shape of a truncated cone, and the longitudinal section of the oil inlet end 411 gradually decreases from one end close to the oil delivery pipe 31 to the other end, and the oil outlet end 412 is in the shape of a truncated cone, and the longitudinal section of the oil outlet end 412 gradually increases from one end close to the oil delivery pipe 31 to the other end. The minimum longitudinal section of the oil inlet end 411 is the same as the minimum longitudinal section of the oil outlet end 412, and the maximum longitudinal section of the oil inlet end 411 is greater than the maximum longitudinal section of the oil outlet end 412.

[0039] An upper clamping wheel group 51 for guiding the yarn 6 is arranged above the wire passing channel 42, and a lower clamping wheel group 52 for guiding the yarn 6 is arranged below the wire passing channel 42. An upper cam roller 53 is arranged between the upper clamping wheel group 51 and the wire passing channel 42, and the upper cam roller 53 is driven by an external upper cam motor (not shown in the figure, but those skilled in the art should understand the installation method of the upper cam motor). When the upper cam roller 53 rotates, the yarn 6 is pressed upward, and a lower cam roller 54 is arranged between the lower clamping wheel group 52 and the wire passing channel 42. When the lower cam roller 54 rotates, the yarn 6 is pressed upward, and the lower cam roller 54 is driven by an external lower cam motor (not shown in the figure, but those skilled in the art should understand the installation method of the lower cam motor). The upper cam roller 53 and the lower cam roller 54 are respectively located on both sides of the yarn 6. Oil-absorbing cotton 43 is arranged on one side of the wire-passing channel 42, and an oil extraction pipe 44 connected to the oil-absorbing cotton 43 is arranged on the wire-passing channel 42. The oil extraction pipe 44 is connected to an external negative pressure mechanism (not shown in the figure). When the upper cam roller 53 does not press the yarn 6, the yarn 6 does not contact with the oil-absorbing cotton 43. When the upper cam roller 53 presses the yarn 6 by rotating, the yarn 6 contacts with the oil-absorbing cotton 43.

[0040] refer to Figure 3 and Figure 4 ,exist Figure 4 In the process, the yarn 6 is pressed by the upper cam roller 53 and then bent obliquely, thereby contacting the oil-absorbing cotton 43. It can achieve better tension, better uniform distribution of oil, and removal of excess oil.

[0041] A heating mechanism 21 is provided on the side of the temperature control channel 2 close to the oil outlet 12, a cooling mechanism 22 is provided on the side of the temperature control channel 2 close to the oil delivery device 3, and a temperature sensor 23 is provided on the temperature control channel 2 between the heating mechanism 21 and the cooling mechanism 22. The temperature control channel 2 is S-shaped, and the temperature control channel 2 has at least two turning portions 24. There are two temperature sensors 23, and at least one turning portion 24 is provided between the two temperature sensors 23.

[0042] In the above scheme, the rotating motor 32, the upper cam motor, and the lower cam motor are all ordinary motors or servo motors; the yarn oil supply pump 1, the upper clamping wheel set 51, and the lower clamping wheel set 52 can be controlled by ordinary motors or servo motors. The heating mechanism 21, the cooling mechanism 22, and the temperature sensor 23 are all conventional technologies in the field and will not be described in detail here.

[0043] A method for oiling low-energy yarn 6 based on the same inventive concept comprises the following steps:

[0044] In the first step, the oil is outputted by the yarn oil supply pump 1, and the oil temperature is adjusted through the temperature control channel 2, and then the oil is inputted into the oil delivery device 3;

[0045] In the second step, the yarn 6 passes through the thread passage 42 of the yarn conveying device 4, and the oil delivery device 3 is used to evenly output the oil to the oil inlet end 411 of the yarn conveying device 4, and the remaining oil is discharged from the oil outlet end 412;

[0046] In the third step, the oil discharged from the oil outlet port 412 returns to the oil inlet port 11 .

[0047] The upper clamping wheel set 51 and the lower clamping wheel set 52 located outside the thread passage 42 are used to convey the yarn 6, the upper cam roller 53 and the lower cam roller 54 cooperate to control the tension of the yarn 6, and the oil-absorbing cotton 43 provided on the thread passage 42 is used to apply and absorb the oil on the yarn 6. The oil outlet 412 is in a negative pressure state, so that the oil is output from the oil inlet 411 to the oil outlet 412.

[0048] When controlling, there are three main aspects of control.

[0049] First, oil temperature control, using the temperature sensor 23 to sense the oil temperature, and controlling it through the heating mechanism 21 and the cooling mechanism 22 to achieve rapid control of the temperature of the oil output;

[0050] Second, the control of oil output is achieved by using the oil delivery device 3, the oil inlet end 411, and the oil outlet end 412 to achieve more accurate oil output, and the oil outlet end 412 is negative pressure to achieve the control of the lateral delivery of the oil. In addition, the upper cam roller 53, the lower cam roller 54, the oil absorbent cotton 43, and the oil extraction pipe 44 are used to achieve auxiliary control of the oil;

[0051] Third, the output of the yarn 6 is controlled by the upper clamping wheel set 51, the lower clamping wheel set 52, the upper cam roller 53, and the lower cam roller 54 to achieve control of the speed and tension of the yarn 6.

[0052] By combining oil output control and yarn 6 output control, precise control of coating amount can be effectively achieved.

[0053] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A low-energy consumption yarn oiling device for oiling a yarn (6), characterized in that: The invention comprises a yarn oil supply pump (1), a temperature control channel (2) for adjusting the temperature of the oil body, an oil delivery device (3) connected to the temperature control channel (2), and a yarn conveying device (4) connected to the oil delivery device (3). The yarn oil supply pump (1) is provided with an oil inlet (11) connected to an external oil circuit and an oil outlet (12) connected to the temperature control channel (2). The oil delivery device (3) comprises an oil delivery pipe (31) and a rotating motor (32). An oil delivery cavity (311) is provided in the oil delivery pipe (31). An oil delivery outlet (312) connected to the oil delivery cavity (311) is provided at one axial end of the oil delivery pipe (31). An oil delivery inlet (313) is provided at one end of the side of the oil delivery pipe (31) away from the oil delivery outlet (312). A screw delivery shaft (314) is provided in the oil delivery cavity (311). Two screw delivery shafts (314) supporting the screw delivery are provided at both ends of the screw delivery shaft (314). The oil delivery pipe (31) is provided with a rotating groove (317) for accommodating the rotating disc (315) to rotate, and the output shaft of the rotating motor (32) is provided with a magnetic disc (321). The magnetic disc (321) is magnetically connected to the rotating disc (315) near the magnetic disc (321). When the rotating motor (32) rotates, the magnetic disc (321) drives the screw conveying shaft (314) to rotate. The yarn conveying device (4) comprises a transverse oil passage (41) and a longitudinal wire passage (42), wherein the oil passage (41) intersects and communicates with the wire passage (42), and the oil passage (41) is divided by the wire passage (42) into an oil passage inlet end (411) and an oil passage outlet end (412), wherein the oil passage inlet end (411) is communicated with an oil delivery outlet (312), and the oil passage outlet end (412) is communicated with an oil inlet (11); An upper clamping wheel set (51) for guiding the yarn (6) is arranged above the thread-passing channel (42), and a lower clamping wheel set (52) for guiding the yarn (6) is arranged below the thread-passing channel (42). An upper cam roller (53) is arranged between the upper clamping wheel set (51) and the thread-passing channel (42). The upper cam roller (53) is driven by an external upper cam motor. When the upper cam roller (53) rotates, it realizes pressing the yarn (6). A lower cam roller (54) is arranged between the lower clamping wheel set (52) and the thread-passing channel (42). When the lower cam roller (54) rotates, it realizes pressing the yarn (6). The lower cam roller (54) is driven by an external lower cam motor. The upper cam roller (53) and the lower cam roller (54) are respectively located on both sides of the yarn (6); An oil-absorbing cotton (43) is arranged on one side of the wire-passing channel (42); an oil-extracting pipe (44) connected to the oil-absorbing cotton (43) is arranged on the wire-passing channel (42); the oil-extracting pipe (44) is connected to an external negative pressure mechanism; when the upper cam roller (53) does not press the yarn (6), the yarn (6) and the oil-absorbing cotton (43) are not in contact; when the upper cam roller (53) presses the yarn (6) by rotating, the yarn (6) and the oil-absorbing cotton (43) are in contact; The oil inlet end (411) is in the shape of a truncated cone, and the longitudinal cross-section of the oil inlet end (411) gradually decreases from one end close to the oil pipe (31) to the other end; the oil outlet end (412) is in the shape of a truncated cone, and the longitudinal cross-section of the oil outlet end (412) gradually increases from one end close to the oil pipe (31) to the other end; the minimum longitudinal cross-section of the oil inlet end (411) is the same as the minimum longitudinal cross-section of the oil outlet end (412); the maximum longitudinal cross-section of the oil inlet end (411) is greater than the maximum longitudinal cross-section of the oil outlet end (412); the oil outlet end (412) is in a negative pressure state, thereby realizing the output of oil from the oil inlet end (411) to the oil outlet end (412).

2. A low-energy consumption yarn oiling device according to claim 1, characterized in that: A heating mechanism (21) is provided on a side of the temperature control channel (2) close to the oil outlet (12), a cooling mechanism (22) is provided on a side of the temperature control channel (2) close to the oil delivery device (3), and a temperature sensor (23) is provided on the temperature control channel (2) between the heating mechanism (21) and the cooling mechanism (22).

3. A low-energy consumption yarn oiling device according to claim 2, characterized in that: The temperature control channel (2) is S-shaped, the temperature control channel (2) has at least two turning portions (24), there are two temperature sensors (23), and there is at least one turning portion (24) between the two temperature sensors (23).

4. A low-energy consumption yarn oiling method, applied to a low-energy consumption yarn oiling device as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: In the first step, the oil is outputted by the yarn oil supply pump (1), passes through the temperature control channel (2), the oil temperature is adjusted, and then the oil is inputted into the oil delivery device (3); In the second step, the yarn (6) passes through the yarn passage (42) of the yarn conveying device (4), and the oil delivery device (3) evenly delivers oil to the oil inlet (411) of the yarn conveying device (4), and the remaining oil is discharged from the oil outlet (412); In the third step, the oil discharged from the oil outlet (412) returns to the oil inlet (11).

5. A low-energy consumption yarn oiling method according to claim 4, characterized in that: The yarn (6) is conveyed by means of an upper clamping wheel group (51) and a lower clamping wheel group (52) located outside the thread passage (42), the tensioning control of the yarn (6) is achieved by means of the cooperation between the upper cam roller (53) and the lower cam roller (54), and the oil-absorbing cotton (43) provided on the thread passage (42) is used to apply and absorb oil to the yarn (6).

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