CN113201817A - Drawing frame with microwave sensor and independent drive - Google Patents

Abstract

According to the technical scheme, each fiber strip cotton feeding roller of a guide frame, the front bottom roller, the middle bottom roller and the rear bottom roller of a drafting system, a winding disc and a sliver can disc are respectively driven by an independent motor, and meanwhile, a non-contact type sliver inlet detection system and a non-contact type sliver outlet monitoring system of a microwave sensor are adopted to replace a traditional sliver inlet detection system and a traditional sliver outlet monitoring system of a displacement sensor, so that on one hand, a non-contact high-speed drawing frame is realized, and the limitation of the current sliver outlet speed of 1200 m/min is broken through; on one hand, due to a completely independent motor control principle, a digital drawing frame is realized, namely, the drawing speed, the total drafting multiple, the drafting multiple of a rear area, the tension of a fiber strip on a guide frame, the tension of the fiber strip between the guide frame and a drafting system, the tension of the fiber strip between a front roller and a coiling disc and the coiling speed ratio of the fiber strip between the coiling disc and a can disc can realize direct conversation and adjustment of a human-computer interface.

Description

A draw frame with microwave sensor and independent drive

technical field

The invention relates to a drawing frame which adopts a microwave sensor to detect and monitor fiber strips and is independently driven, and belongs to the field of textile machinery.

Background technique

As an indispensable production equipment in a spinning mill, the drawing frame draws, mixes, removes impurities and parallelizes the fiber sliver to produce fiber sliver with uniform quality and weight for use in the next process.

At present, the draw frame is a very mature model, with up to 8 sliver fed from the creel to the drafting system; after drafting, mixing, trash removal and fiber parallelization of the drafting system, a single sliver is produced. , and then through the coiling disc, the coil is placed in a sliver can for use in the next process. Among them: creel section: up to 8 feed rollers pull the sliver out of the can; drafting systems are mostly 4-up and 3-down drafting devices: in the form of 4 top rollers and 3 bottom rollers; coiling section It consists of an upper coiling pan and a bottom can pan, where the sliver coils are placed on the cans.

For the autoleveler draw frame, there is an incoming sliver detection device for the fed fiber sliver, which monitors the quality and thickness of the fed sliver in real time; further, an autoleveler The change of weight and thickness can adjust the drafting ratio of the drafting system accordingly, so as to realize the function of autoleveling and ensure the production of sliver is uniform; further, a sliver monitoring device can monitor the quality of the sliver in real time. Set the required range of fiber strips, immediately alarm or stop. Therefore, the draw frame with autoleveler is more and more important, and it plays an irreplaceable role for the spinning mill to control and improve the quality of the yarn. At present, the mature drawing frame autoleveling system, the entry detection device adopts a pair of rotating concave and convex rollers and a displacement sensor; the outgoing monitoring device adopts a pair of pressure rollers and a displacement sensor, or adopts a Cotton guide and fiber pressure sensor.

Although the current draw frame has been able to meet the production requirements of the spinning mill, and can improve and control the sliver quality, it provides a prerequisite for the improvement of the yarn quality. However, the current drawing frame still exists in terms of production flexibility, user-friendly operation and reduction of labor costs for fiber slivers of different raw materials and different thicknesses, as well as the rising cost of textile workers. Room for improvement and improvement. Especially: the drafting system uses one or two motors to control the three bottom rollers of the four-up and three-down drafting system, and adopts the method of replacing the process gear to adjust the total draft multiple, the draft multiple in the rear area and the tension of the fiber strip. etc. settings. The creel system, the drafting system, and the coiling system are not completely independent drives. This lack of independent drive not only adds additional process gears, but also increases the operational complexity of the equipment; another disadvantage is that for the autoleveling function of the draw frame, the concave and convex rollers and the pressure rollers are used to detect and monitor respectively. The method of fiber sliver, for different varieties of fiber sliver, it is necessary to replace the concave and convex rollers of different sizes. Further, the fiber sliver is fed into the drafting system under a pair of pressurized rotating concave and convex rollers; under a pair of pressurized rotating pressure rollers, it is fed into the coiling disc. During these processes, the fiber strip and the concave and convex The contact between the roller and the pressing roller has an adverse effect on the quality of the fiber sliver, especially when the drawing frame speed exceeds 1200 m/min, the adverse effect on the fiber sliver increases significantly.

SUMMARY OF THE INVENTION

In order to overcome the shortcomings of the current draw frame's creel system, drafting system and coiling system not being driven completely independently, and the shortcomings of the contact detection and monitoring method used for the incoming and outgoing bars of the leveling system, the present invention proposes a Independently driven draw frame with microwave sensor.

A specific technical scheme of a drawing frame proposed by the present invention is:

For creel systems: each sliver feeding roller is driven by an independent motor, for up to 8 feeding slivers, up to 8 independent motors; The option is: the feeding rollers with 8 slivers are driven by a common independent motor.

For the drafting system: a drafting system with 4 uppers and 3 lowers is adopted, in which the front, middle and rear bottom rollers are driven by independent motors respectively;

For the coiling system: The coiling drum and the can drum are driven by separate motors.

For the autoleveling system: the incoming sliver detection system uses a non-contact microwave sensor to detect the weight and thickness changes of the fiber sliver in real time, and the outgoing sliver monitoring system uses a non-contact microwave sensor to monitor the real-time change of the weight and thickness of the fiber sliver.

The advantages of this technical solution of the present invention are: based on the technical solution of the present invention, each fiber sliver feeding roller of the creel system, the front, middle and rear bottom rollers of the drafting system, the coiling drum and the can drum are respectively It is driven by an independent motor, and at the same time, the non-contact incoming bar detection system and out bar monitoring system using microwave sensors replace the traditional displacement sensor incoming bar detection system and bar out monitoring system. It breaks through the current drawing frame speed limit of 1200 m/min; on the one hand, due to the completely independent motor control principle, a digital drawing frame is realized, that is, the drawing frame speed, the total draft multiple, and the draft in the rear area. Multiplier, the tension of the sliver in the creel, the tension of the sliver between the creel and the drafting system, the tension of the sliver between the front roller and the coiling drum, the tension of the fiber sliver between the coiling drum and the can drum The speed ratio of the coils can be directly communicated and adjusted by the man-machine interface.

As a preferred embodiment 1 of the present invention:

The draw frame is a single-eye autoleveler draw frame. Up to 8 fiber slivers are fed into the creel from 8 cans respectively, pass through the feeding rollers of the creel, become fiber sliver clusters, and enter an incoming sliver detection system composed of microwave sensors. The incoming sliver detection system acquires the mass and volume changes of the fiber sliver cluster in real time. Further, the fiber strand tufts enter a drafting system consisting of 4 top rollers and 3 bottom rollers. In the drafting system, after the action of drafting and leveling, the fiber sliver cluster becomes a fiber sliver with a preset weight. Under the implementation and monitoring of the sliver monitoring system composed of microwave sensors, it enters a pair of pressing rollers, and then enters the ring. bar system. Further, under the action of the rotating coiling disc, the coils are placed in an empty can driven by the can disc. When the preset fiber sliver length is reached, the empty can is filled.

The feeding rollers of the creel are driven by independent motors respectively. For the feeding of up to 8 slivers, there are 8 independent motors driving the feed rollers, which pull the sliver out of the can. Compared with the traditional creel sharing a motor drive, the advantage of this is that each motor can fine-tune the speed of driving the feeding roller according to the feeding situation of each fiber sliver, so as to maintain the tension of the feeding fiber sliver. Consistent, reducing accidental drafts. What's more advantageous is that this adjustment can be set on the man-machine interface of the drawing frame.

The 4-up and 3-down drafting system consists of 4 top rollers and 3 bottom rollers. The 3 bottom rollers are called back bottom rollers, middle bottom rollers and front bottom rollers, respectively, along the feeding direction of the fiber sliver. . The front, middle and rear bottom rollers are respectively driven by three motors. Since the linear speed ratio between the front bottom roller and the rear bottom roller is the total drafting multiple of the drawing frame, therefore, by setting the motor revolution ratio between the front bottom roller and the rear bottom roller, it can be set Total draft ratio. Similarly, since the linear speed ratio between the middle bottom roller and the back bottom roller is the drafting multiple of the rear area of the drawing frame, by setting the motor revolution ratio between the middle bottom roller and the back bottom roller, You can set the draft ratio of the rear area. The number of revolutions of the motors of the front, middle and rear bottom rollers can be set on the man-machine interface, so that the total drafting multiple and the drafting multiple of the rear area of the drawing frame can be set directly on the man-machine interface. This brings flexibility and convenience in setting the drawing frame's process parameters.

The coiling disc and the can disc of the coiling system are driven by independent motors respectively, instead of the traditional common driving by one motor. The advantages of this are: on the one hand, the complexity of the mechanical transmission is reduced; Make sure that there is a proper spacing between the fiber strips, so that the fibers will not stick and fluff.

The incoming strip detection system and outgoing strip monitoring system use microwave sensors to acquire the weight and volume changes of the fiber strips, thereby converting them into electrical signals. This electrical signal represents the change in thickness and weight offset of the fiber strip. The working principle of the leveling system is that, according to the change in the weight and volume of the fiber sliver obtained by the entry detection system, the leveling system correspondingly changes the number of revolutions of the motors of the middle bottom roller and the back bottom roller, thereby changing the total draft ratio. At the same time, the number of motor revolutions of the front bottom roller remains constant. In this way, the leveling effect of the fiber strands is achieved. For the weight and volume variation of the incoming bar, the general working range is within the range of +-25%, beyond this range, the leveling system will issue an alarm. The sliver monitoring system monitors the changes in the weight and volume of the leveled fiber sliver in real time. Once the quality of the fiber sliver is exceeded, the leveling system will also issue an alarm.

The microwave sensor utilizes the physical properties of microwaves to measure the weight and volume of the fiber strip, and has a cavity resonator device, and the fiber strip is guided into the cavity resonator device. Since the fiber sliver passes through the cavity resonator without contact, compared with the traditional contact measurement of the concave-convex roller and the pressing roller, there will be no measurement error due to mechanical contact and no adverse impact on the quality of the fiber sliver due to friction. . The sliver conveying speed (sliver speed), especially at the sliver monitoring point, can reach 2000 m/min. Further, by using the microwave sensor, another advantage is that for different types and thicknesses of fiber strips, due to the sufficient space of the resonant cavity, it is not necessary to change the size of the concave-convex roller like the concave-convex roller.

As a preferred embodiment 2 of the present invention:

In the above-mentioned 4-up and 3-down drafting system, in order to reduce the input cost, the middle and rear bottom rollers are driven by a shared motor, and the front bottom roller is still driven by an independent motor. This sacrifices the flexibility of setting the draft ratio of the rear area on the man-machine interface, but because the draft ratio of the rear area is not a technical parameter that needs to be changed frequently, this is an economical solution combined with the input cost of the machine .

As a preferred embodiment 3 of the present invention:

The feeding rollers (generally no more than 8) of the sliver frame can also be driven by a shared independent motor, or every 2 feeding rollers are driven by a motor, then the entire 8 feeding rollers, a total of 4 motor driven. The advantage is that the cost of machinery and equipment can be reduced.

As a preferred embodiment 4 of the present invention:

The incoming microwave sensor is located between the feed roller of the creel and the rear bottom roller of the drafting system; the outgoing microwave sensor is located between the front bottom roller of the drafting system and the coiling disc.

As a preferred embodiment 5 of the present invention:

The motors of the feeding rollers of the creel, the motors of the front, middle and rear bottom rollers of the drafting system, and the motors of the coiling reels and the can reels of the coiling system are controlled by one or more control systems, So as to ensure the synchronization and cooperation between the various motors. The motor is preferably a variable frequency motor or a servo motor.

As a preferred embodiment 6 of the present invention:

The man-machine interface of the drawing frame can set and adjust the parameters of each motor, especially the number of revolutions, including but not limited to the motor between the feeding rollers of the creel, the feeding roller motor and the back bottom roller. Between the motors, between the front bottom roller and the rear bottom roller motor, between the rear bottom roller and the middle bottom roller motor, between the front bottom roller motor and the coiling reel motor, between the coiling reel motor and the can reel motor , so that these process parameters can be adjusted on the man-machine interface: the tension of each feeding fiber sliver of the creel, the total draft multiple, the draft multiple in the rear area, the coil tension, and the fiber sliver before the fiber sliver is placed in the can. spacing, etc.

As a preferred embodiment 7 of the present invention:

The described drawing frame is a double-eye drawing frame, which is composed of two single-eye drawing frames. Each eye is independent from the other eye. Each eye employs the motor drive concept described by the preferred embodiment 1 of the present invention. The advantage is that compared with the single-eye draw frame, the double-eye draw frame can reduce the floor space and save the workshop area.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

1 is a schematic diagram of a first embodiment of the present invention

Figure 2 is a schematic diagram of a second embodiment of the present invention

Figure 3 is a schematic diagram of a third embodiment of the present invention

4 is a schematic diagram of the microwave sensor autoleveling control of the present invention

5 is a schematic diagram of a single eye and a double eye draw frame of the present invention

in,

M1. Front bottom roller motor;

M2. Middle bottom roller motor;

M3. Back bottom roller motor;

M4. coil coil motor;

M5. Can motor;

M6. The first feeding roller motor;

M7. The second feeding roller motor;

M8. The third feeding roller motor;

M9. The fourth feeding roller motor;

M10. The fifth feeding roller motor;

M11. The sixth feeding roller motor;

M12. The seventh feeding roller motor;

M13. The eighth cotton feeding roller motor;

M14. Feeding rollers share the motor;

M15. The middle and rear bottom rollers share the motor;

R1. Front bottom roller;

R2. Mid bottom roller;

R3. Back bottom roller;

S1. Into the microwave sensor;

S2. Outgoing microwave sensor;

F1. Fiber strip;

F2. Fiber sliver cluster;

C1. coiling plate;

C2. Can;

C3. Can disc;

L1. The first feeding roller;

L2. The second feeding roller;

L3. The third feeding roller;

L4. The fourth feeding roller;

L5. The fifth feeding roller;

L6. The sixth feeding roller;

L7. The seventh feeding roller;

L8. Eighth cotton feeding roller;

L9. Roller pair;

T. fiber strip running direction;

P1. Motor control system;

P2. Autoleveling control system;

D1. Schematic diagram of single-eye drawing frame;

D2. Schematic diagram of the double-eye drawing frame.

Detailed ways

Figure 1 is the first preferred embodiment of the present invention. The picture shows a single-eye autoleveler draw frame, including 8 feeding rollers (L1-L8), one incoming microwave sensor S1 and one outgoing microwave sensor S2, front bottom roller R1, middle bottom roller R2, and back bottom A roller R3, a pair of outgoing rollers L9, a coiling reel C1, a can C2, and a can reel C3. The motor control system P1 controls the settings of each motor (M1-M3).

8 fiber slivers F1 are pulled by the feeding rollers (L1-L8), along the direction of T, enter the incoming microwave sensor S1, and enter the drafting area composed of front, middle and rear bottom rollers; in the drafting area Carry out drafting and leveling action.

Further, the drawn and leveled fiber strand cluster F2 enters the outgoing strand microwave sensor S2. The sliver microwave sensor S2 monitors the quality information of the fiber sliver cluster F2 in real time.

Further, after being conveyed by a pair of outgoing rollers L9, it enters the rotating coiling disk C1; under the rotation of the coiling disk C1, the fiber sliver cluster F2 is coiled and placed in the can C2. The can C2 is driven in rotation by the can disc C3, so that the fiber sliver tuft F2 is regularly wound in the can C2.

Unlike the limitations of traditional draw frames, in the draw frame shown in Figure 1, the eight feed rollers (L1-L8) are each driven by eight independent motors. The described cotton feeding roller motors (M6-M13) independently control the feeding of each fiber sliver F1. The benefit is that due to the different fiber states of each fiber strip F1: the bulkiness and cohesion of the fiber strip are different, resulting in different tension of the fiber strip during high-speed pulling of each fiber strip F1. In order to keep the tension of the 8 fiber strips consistent, each independently controlled motor (M6-M13) can change the pulling speed of each fiber strip, so that each fiber strip has a different speed, but the fiber strip tension remains the same, Thereby achieving the benefit of no accidental drafting. From the creel parts, a good pulling effect of the fiber strip is ensured. And the adjustment and setting of the motor (M6-M13) of the feeding roller can be done in the motor control system P1.

Fig. 2 shows the second embodiment of the present invention, which differs from the first embodiment shown in Fig. 1 in that the eight feeding rollers (L1-L8) of the creel are driven by a common motor M14. Compared to the first embodiment shown in Figure 1, this embodiment significantly reduces 7 feeding roller motors. For some customers who are more concerned about cost performance, this is an economical economical solution.

In Figure 1, the front bottom roller R1 is driven by a motor M1; the middle bottom roller R2 is driven by a motor M2; the rear bottom roller R3 is driven by a motor M3. What we know is that the ratio of the linear speed of the front bottom roller R1 and the rear bottom roller R3 of the draw frame is the total draft multiple, and the linear speed ratio of the middle bottom roller R2 and the rear bottom roller R3 is the draft multiple of the rear area. Different from the traditional draw frame, the front, middle and rear bottom rollers (R1, R2, R3) of the present invention are driven by independent motors (M1, M2, M3) respectively, so there is no need to replace the process gear, only By setting the parameters of each motor (M1, M2, M3) directly in the motor control system P1, especially the number of revolutions, the linear speed ratio of the front, middle and rear bottom rollers (R1, R2, R3) can be adjusted, thereby Realize the value of adjusting the total draft multiple and the rear area draft multiple. Preferably, the motor control system P1 is connected to the man-machine interface, and the connection can realize digital adjustment, that is, the total drafting multiple and the drafting multiple of the rear area of the drawing frame are set on the man-machine interface, instead of the tedious replacement of the process gear. Shortcomings.

In Fig. 1, the coiling disc C1 and the can disc C3 are driven by independent motors M4 and M5, respectively. The ratio of revolutions between the coiling disc C1 and the can disc C3 is called the coiling ratio. A suitable coiling ratio can ensure that the fiber sliver F2 is well formed in the can C2. Therefore, in actual production, the coiling disc C1 and the can disc C3 are driven by one motor, even by the front bottom roller motor. This coiling ratio is realized by changing the process gear. In the embodiment of the present invention, since the coiling disc C1 and the can disc C3 are driven by independent motors M4 and M5, it is possible to directly adjust and set the coiling ratio through the motor control system P1, instead of changing the gear ratio. method to change the coil ratio.

Further, between the front bottom roller R1 and the coiling disc C1, the fiber sliver tension of this section of fiber sliver F2 is also a very important process parameter. Since the front bottom roller R1 and the coiling disc C1 of the present invention are driven by the independent motor M1 and the motor M4 respectively, the same advantage is that we can set the fiber sliver tension in the motor control system P1.

In the embodiment of the present invention shown in FIG. 1, the incoming microwave sensor S1 is located between the feeding roller L1 and the rear bottom roller R3. The 8 fiber slivers F1 fed from the cotton feeding rollers (L1-L9) enter the incoming sliver microwave sensor S1, where the incoming sliver microwave sensor S1 acquires the changes in the weight and volume of the fiber sliver F1 in real time, and converts this change converted into electrical signals. These signals represent the weight and volume information of the fiber strips.

In the embodiment of the present invention shown in FIG. 1, the outgoing microwave sensor S2 is located between the front bottom roller R1 and the coiling disc C1. The drawn and leveled fiber strand F2 is fed into the outgoing microwave sensor S2. Here, the weight and volume of the fiber strand cluster F2 are acquired in real time by the outgoing microwave sensor S2, converted into an electrical signal, and the weight and volume of the fiber strand cluster F2 are simulated by calculation. Once the quality parameters such as the weight and volume of the fiber sliver cluster F2 exceed the preset range, an alarm message will be issued or the vehicle will stop. Thus, it is ensured that the quality of the output fiber strands F2 is within the control range.

In the embodiment of the present invention shown in Figure 1, the feeding rollers (L1-L8), the front, middle and rear bottom rollers (R1, R2, R3), the coiling disc C1 and the can disc C3 are independently Motor drive, thus realizing a completely independent drive concept.

Figure 3 is a third implementation of the present invention, which is a more economical solution. Compared with the first and second embodiments shown in Figures 1 and 2, in this embodiment, the feeding rollers (L1-L8) are driven by a common motor M14, and the middle bottom roller R2 and the back bottom roller R3 are driven by a single motor M14. Common motor M15 drive.

FIG. 4 is a schematic diagram of the autoleveling control of the microwave sensor of the present invention. An autoleveling control system P2 obtains the information of the fiber sliver F1 in real time from the incoming microwave sensor S1, and compares it with the information of the standard fiber sliver F1. The draft ratio between the bottom roller R1 and the middle bottom roller R2. The amount of change in the drafting ratio is achieved as follows: the rotation speed of the front bottom roller R1 remains constant, the rotation speed of the middle bottom roller R2 and the rear bottom roller R3 relative to the number of revolutions of the front bottom roller R1, according to the required change amount, in Changes are made under the command of the autoleveling control system P2. Since the front, middle and rear bottom rollers (R1, R2, R3) are driven by the motors (M1, M2, M3) respectively, the change of the draft ratio is controlled by the autoleveling control system P2 to control the revolutions of the motor M2 and the motor M3 to fulfill. Further, the drawn and leveled fiber sliver cluster F2 is monitored in real time by the outgoing microwave sensor S2 installed between the front bottom roller R1 and the coiling disc C1. Once the quality of the fiber sliver cluster F2 exceeds the preset alarm range, It will sound an alarm or stop. Thereby, the quality of the produced fiber strands F2 can be monitored in real time to ensure that the quality is within the required quality range.

In FIG. 5 , it is a schematic diagram of the single-eye drawing frame and the double-eye drawing frame of the present invention. The D1 is a single eye draw frame. Each single-eye draw frame D1 produces only one sliver at the same time. D2 is a double-eye draw frame, consisting of 2 independent single-eye draw frames D1, wherein each eye draw frame D1 has its own independent drive motor and incoming and outgoing microwave sensors.

Those skilled in the art to which the present invention pertains can make various modifications or additions to the described specific embodiments or substitute in similar manners, but will not deviate from the principles of the present invention or the scope defined by the claims.

Claims (10)

1. A drawing frame with microwave sensors and independent drive comprises cotton feeding rollers (L1, L2, L3, L4, L5, L6, L7 and L8), a strip feeding microwave sensor (S1), a first bottom roller (R1), a second bottom roller (R2), a third bottom roller (R3), a strip discharging microwave sensor (S2), a strip discharging roller pair (L9), a coiling disc (C1), and a coiling disc (C3), and is characterized in that: the cotton feeding rollers (L1, L1 and L1) are driven by at least one motor (M1, M1 and M1), the first bottom roller (R1) is driven by the motor (M1), the second bottom roller (R1) is driven by the motor (M1), the third bottom roller (R1) is driven by the motor (M1), the coiling tray (C1) is driven by the motor (M1), the strip feeding microwave sensor (S1) is positioned between the cotton feeding rollers (L1) and the third bottom roller (R1), and the strip discharging microwave sensor (S1) is positioned between the first bottom roller (R1) and the coiling tray (R1).

2. A drawing frame having a microwave sensor and an independent drive as claimed in claim 1, wherein: the rotation ratio between the motors (M1, M1) of the respective motors (M1, M1) of the cotton feeding rollers (L1, L1) and L1), the motor (M1) of the first bottom roller (R1) and the motor (M1) of the third bottom roller (R1), the motor (M1) of the first bottom roller (R1) and the motor (M1) of the lap winding disc (C1), the motor (M1) of the lap winding disc (C1) and the motor (M1) of the lap winding disc (C1) can be adjusted and set as a process parameter.

3. A drawing frame having a microwave sensor and an independent drive as claimed in claim 1, wherein: the cotton feeding rollers (L1, L2, L3, L4, L5, L6, L7 and L8) are independently driven by motors (M6, M7, M8, M9, M10, M11, M12 and M13) respectively, and can also be driven by one motor (M14).

4. A drawing frame having a microwave sensor and an independent drive as claimed in claim 1, wherein: the second bottom roller (R2) and the third bottom roller (R3) can also be driven by a common motor (M15).

5. A drawing frame with a microwave sensor and independent drive as claimed in claims 1 to 4, characterized in that: the motors (M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, M12, M13, M14 and M15) are servo motors or variable frequency motors.

6. A drawing frame having a microwave sensor and an independent drive as claimed in claim 5, wherein: the feeding microwave sensor (S1) is used for detecting the weight and the volume of the fed fiber strip (F1); the sliver-emitting microwave sensor (S2) is used for monitoring the weight and the volume of the output fiber sliver cluster (F2).

7. A drawing frame having a microwave sensor and an independent drive as claimed in claim 6, wherein: the drawing frame is a single-hole drawing frame (D1).

8. A drawing frame having a microwave sensor and an independent drive as claimed in claim 7, wherein: the drawing frame is a double-eye drawing frame (D2) which is composed of 2 single-eye drawing frames (D1), and each eye is driven independently.

9. A drawing frame having a microwave sensor and an independent drive as claimed in claim 8, wherein: the drawing frames (D1, D2) are autoleveller drawing frames.

10. A drawing frame having a microwave sensor and an independent drive as claimed in claim 9, wherein: the drawing frame (D1, D2) can be used as a drawing frame without auto-leveling after the entry microwave sensor (S1) and the exit microwave sensor (S2) are eliminated.

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