Aerodynamic pressurization mechanism of a drawing frame and a control method thereof

Abstract

The application provides a skin roller pneumatic pressurizing mechanism and control method of a drawing frame, which comprises a base, a roller bench, a cradle, three groups of traction assemblies; each traction assembly comprises a roller assembly and a skin roller assembly; the roller assembly of the first traction assembly is fixed on the roller bench, and the skin roller assembly is fixed on the cradle; the roller assembly of the second and third traction assemblies is slidably arranged on the roller bench, and the skin roller assembly is slidably arranged on a guide rail and a positioning strip; bosses are arranged on the roller seat of the second and third traction assemblies, and grooves are arranged on the skin roller seat of the second and third traction assemblies. The skin roller pressurizing mechanism adopts a pressurizing cylinder to perform pneumatic pressurizing on the skin roller, so that the skin roller pressurizing pressure is prevented from being unstable, the drafting efficiency and quality are affected, and meanwhile, the mechanism has the advantages of quick adjustment of the spacing between the traction assemblies and convenience in replacement of raw material varieties.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textile devices, in particular to a skin roller pneumatic pressurizing mechanism of a drawing frame and a control method. BACKGROUND

[0002] The drawing frame is an intermediate link in the spinning process and is a key process for improving yarn quality. Its role is to effectively control the weight deviation of the sliver, improve the evenness of the sliver, the straightness and parallelism of the fiber, and make the fibers of different qualities more evenly mixed in the sliver to create conditions for obtaining good yarn.

[0003] The function of the skin roller pressurization of the drawing frame is to form a stable holding force between the skin roller and the corresponding roller nip to ensure that the fiber sliver forms normal drafting under the action of the drafting force. At present, the traditional spring pressurization method is generally used for skin roller pressurization, which belongs to a pure mechanical structure. The defects of the spring pressurization method are as follows: first, the pressure of the spring needs to be manually adjusted, and there will be adjustment errors; second, the spring parts will have fatigue failure due to the influence of their own material, processing and other factors; third, when the roller gauge is moved after changing the raw material variety, the position of the skin roller pressurization seat cannot follow the movement of the roller, causing the relative position of the skin roller and the roller to deviate. The above three phenomena will cause the skin roller pressurization pressure to be unstable, affecting the drafting efficiency and quality. SUMMARY

[0004] Therefore, the present application provides a skin roller pneumatic pressurizing mechanism of a drawing frame, which comprises a base, a roller stool, a cradle and three traction assemblies.

[0005] The cradle and the roller stool are fixed on the base, and the relative position of the roller stool and the cradle on the base is fixed

[0006] Each traction assembly comprises a roller assembly and a skin roller assembly.

[0007] The three traction assemblies are arranged side by side, and the three traction assemblies are respectively a first traction assembly, a second traction assembly and a third traction assembly, wherein the first traction assembly is fixed in position, and the second and third traction assemblies can move in the front-back direction.

[0008] The first traction assembly comprises a roller assembly fixed on the roller stool, a guide skin roller assembly and a skin roller assembly fixed on the cradle; the second and third traction assemblies respectively comprise second and third roller assemblies slidably arranged on the roller stool, and second and third skin roller assemblies slidably arranged on the guide rail and the positioning strip.

[0009] The roller seat of the second traction assembly and the third traction assembly is provided with a boss, and the skin roller seat of the second traction assembly and the third traction assembly is provided with a groove.

[0010] Each of the two end of the skin roller assembly has one same skin roller seat and one pressurizing cylinder, the pressurizing cylinder is vertically installed above the skin roller seat, and the piston rod of the pressurizing cylinder penetrates the skin roller seat and acts on the bearing shell of the skin roller.

[0011] Further, the cradle comprises two fixed plates and a connecting plate, the two fixed plates are arranged in parallel along the left-right direction, and the connecting plate is fixedly connected to the rear side of the two fixed plates; the side of each fixed plate close to the other fixed plate is convexly provided with a guide rail extending along the front-rear direction, and each skin roller seat is provided with a groove matched with the guide rail, and the guide rail is slidably arranged in the groove.

[0012] Further, the cradle comprises a rotating arm, and a positioning strip is arranged on the rotating arm along the left-right direction.

[0013] Further, the cradle is further provided with a locking plate, the locking plate is fixed to the fixed plate through a rotating shaft and can rotate around the rotating shaft, the fixed column is installed on the pad and fixed to the roller stool, and the locking plate is provided with a bayonet at each end, and the fixed column is provided with a clamping groove at the upper end, and the bayonet and the clamping groove are matched with each other.

[0014] Further, the pressurizing cylinders of the first traction assembly are single-out shaft cylinders, and the pressurizing cylinders of the second and third traction assemblies are double-out shaft cylinders, each double-out shaft cylinder can extend a piston rod in the up-down direction of the cylinder, the pressurizing cylinders of the second and third traction assemblies extend the piston rods upward to press the positioning strips, and the pressurizing cylinders of the second and third traction assemblies extend the piston rods downward to press the bearing shells of the skin rollers.

[0015] Further, a detection ring is arranged on the piston rod of the double-out shaft cylinder, and the lower end surface of the detection ring is arranged at a constant distance from the lower end surface of the piston rod; and a limit switch is arranged in the skin roller seat, and the position of the limit switch can be adjusted up and down.

[0016] Further, the pressurizing mechanism further comprises a PLC controller, the PLC controller is connected with all single-shaft cylinders and all double-shaft cylinders, and the PLC controller controls the switching of all single-shaft cylinders and all double-shaft cylinders between the pressurizing state and the pressure releasing state.

[0017] Further, each pressurizing cylinder is provided with a pressure regulating valve, and the pressure regulating valve is used to adjust the pressure of the pressurizing cylinder on the skin roller.

[0018] The application further provides a control method of the skin roller pneumatic pressurizing mechanism of the drawing frame, and the method comprises the following steps:

[0019] S1: judging whether the skin roller pneumatic pressurizing mechanism needs to be adjusted in distance, if yes, executing step S2, otherwise executing step S3;

[0020] S2, stop, issue a regulation gap command, make the pressurized cylinder act to keep the piston rod from pressing the positioning strip and the leather roller, and be in a semi-unpressurized state; and move the second roller assembly and the third roller assembly to adjust to the appropriate gap; after the adjustment, restart the operation;

[0021] S3: determine whether the leather roller pneumatic pressurization mechanism needs to be pressurized, if yes, execute step S4, otherwise maintain the original state;

[0022] S4: clamp the locking plate into the fixed column to lock the cradle; issue a pressurization command, and each pressurized cylinder pressurizes the leather roller, and detect the contact limit switch;

[0023] S5: manually adjust the pressure of each pressurized cylinder, wherein the first pressure regulating valve controls the pressure of the pressurized cylinder of the guide leather roller assembly, the second pressure regulating valve controls the pressure of the pressurized cylinder of the first leather roller assembly, and the third pressure regulating valve controls the pressure of the pressurized cylinder of the second leather roller assembly and the third leather roller assembly.

[0024] The leather roller pneumatic pressurization mechanism and control method of the drawing frame have the following advantages: the leather roller pressurization mechanism uses pressurized cylinders to pressurize the leather roller, thereby preventing the pressurization pressure of the leather roller from being unstable and affecting the drafting efficiency and quality.

[0025] Meanwhile, the roller assemblies of the second and third traction assemblies of the leather roller pressurization mechanism are slidably arranged on the roller stool fixed on the base, thereby facilitating the adjustment of the roller gap of the drawing frame; the roller seat of the second and third traction assemblies is provided with a boss, and the leather roller seat of the second and third traction assemblies is provided with a groove, the boss and the groove form a tenon-groove structure, so that the roller assemblies and the leather roller assemblies of the second and third traction assemblies move synchronously; the pressurized cylinders of the second and third traction assemblies are double-output shaft cylinders, the piston rod of the pressurized cylinder can press the positioning strip upward and press the bearing shell of the leather roller downward, thereby keeping the relative position of the leather roller fixed when switching between pressurization and unpressurization states; the leather roller pressurization mechanism has the advantage of being capable of quickly adjusting the distance between the traction assemblies, thereby facilitating the replacement of raw materials. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the overall structure diagram of the leather roller pressurized cylinder positioning mechanism for the drawing frame.

[0027] Figure 2 is the internal structure diagram of the leather roller pressurized cylinder positioning mechanism for the drawing frame.

[0028] Figure 3 is the cross-sectional structure diagram of the leather roller pressurized cylinder positioning mechanism for the drawing frame.

[0029] Figure 4It is the structure diagram of the pad plate 35 and fixed column 36 of the skin roll pressurizing cylinder positioning mechanism of the drawing frame.

[0030] Figure 5 It is the structure diagram of the third roller assembly 41 of the skin roll pressurizing cylinder positioning mechanism of the drawing frame.

[0031] Figure 6 It is the structure diagram of the third roller assembly 51 of the skin roll pressurizing cylinder positioning mechanism of the drawing frame.

[0032] Figure 7 It is the installation structure diagram of the locking plate 27 of the skin roll pressurizing cylinder positioning mechanism of the drawing frame.

[0033] Figure 8 It is the structure diagram of the locking plate 27 of the skin roll pressurizing cylinder positioning mechanism of the drawing frame.

[0034] Figure 9 It is the structure diagram of the detection ring 10 and limit switch 101 of the skin roll pressurizing cylinder positioning mechanism of the drawing frame.

[0035] Figure 10 It is Figure 1 The structure diagram of the skin roll 7.

[0036] In the figure: 1 base, 11 roller stool, 2 rocker, 21 positioning strip, 22 guide rail, 23 fixed plate, 24 connecting plate, 25 rotating arm, 26 rotating shaft, 27 locking plate, 31 first roller assembly, 311 first roller, 312 first roller seat, 32 first skin roll assembly, 321 first skin roll seat, 33 guide skin roll assembly, 331 guide skin roll seat, 9 single-out shaft air cylinder, 35 pad plate, 36 fixed column, 41 second roller assembly, 411 second roller, 412 second roller seat, 42 second skin roll assembly, 421 second skin roll seat, 6 double-out shaft air cylinder, 61 cylinder cover, 62 piston rod, 51 third roller assembly, 511 third roller, 512 third roller seat, 52 third skin roll assembly, 521 third skin roll seat, 7 skin roll, 71 bearing shell, 10 detection ring, 101 limit switch. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described below with reference to the drawings.

[0038] Please refer to Figures 1 to 10 A skin roll pneumatic pressurizing mechanism of a drawing frame, comprising a base 1, a rocker 2, a roller stool 11, and three groups of traction assemblies.

[0039] The cradle 2 and the roller stool 11 are fixed on the base 1, and the relative positions of the roller stool 11 and the cradle 2 on the base 1 are fixed.

[0040] The cradle 2 comprises two fixed plates 23, a connecting plate 24 and a rotating arm 25. The two fixed plates 23 are arranged in parallel along the left-right direction. The two ends of the connecting plate 24 are fixedly connected with the rear sides of the two fixed plates 23 respectively. The side of each fixed plate 23 close to the other is provided with a guide rail 22 extending along the front-rear direction. Each roller seat is provided with a groove matched with the guide rail 22, and the guide rail 22 is slidably arranged in the groove. The rotating arm 25 is provided with a positioning strip 21 along the left-right direction. The positioning strip 21 is slidably arranged in the groove of the cylinder head 61 and fixedly arranged at the end of the rotating arm 25.

[0041] The locking plate 27 is rotatably arranged on the cradle 2 through the rotating shaft 26 at the two ends. The locking plate 27 can rotate by a certain angle. The lower end of the locking plate 27 is provided with a bayonet which is clamped on the fixed column 36. The fixed column 36 is installed on the 35 pad plate and fixed on the roller stool 11.

[0042] The three groups of traction assemblies are respectively a first traction assembly, a second traction assembly and a third traction assembly. Each traction assembly comprises a roller assembly and a roller assembly. The first traction assembly further comprises a guide roller assembly 33. The three roller assemblies are respectively a first roller assembly 31, a second roller assembly 41 and a third roller assembly 51. The three roller assemblies are respectively a first roller assembly 32, a second roller assembly 42 and a third roller assembly 52. The guide roller assembly 33 and the first roller assembly 32 correspond to the first roller assembly 31, serving as the first traction assembly. The second roller assembly 42 corresponds to the second roller assembly 41, serving as the second traction assembly. The third roller assembly 52 corresponds to the third roller assembly 51, serving as the third traction assembly.

[0043] The four rollers 7 are rotatably arranged on the respective roller seats. The first roller seat 312 of the first roller assembly 31 is fixed on the roller stool 11. The second roller assembly 41 and the third roller assembly 51 are transversely arranged on the roller stool 11, so that the interval distance of the second roller assembly 41 and the third roller assembly 51 can be adjusted.

[0044] The rollers 7 of the guide roller assembly 33 and the first roller assembly 32 are located above the first roller 311. The rollers 7 of the second roller assembly 42 are located above the second roller 411. The rollers 7 of the third roller assembly 52 are located above the third roller 511. The bearing housings 71 at the two ends of all the rollers 7 are provided with pressurized cylinders. The piston rods 62 pass through the respective roller seats and act on the bearing housings 71. The pressurized cylinders press the respective rollers 7 against the first roller 311, the second roller 411 and the third roller 511 respectively.

[0045] The pressurizing cylinders of the guide apron roller assembly 33 and the first apron roller assembly 32 are single-out shaft cylinders 9 and are fixed in position and cannot be moved; the pressurizing cylinders of the second apron roller assembly 42 and the third apron roller assembly 52 are double-out shaft cylinders 6, and the cylinder covers 61 of the double-out shaft cylinders 6 are slidably arranged on the positioning strips 21.

[0046] The second roller seat 412 and the third roller seat 512 are each provided with a boss, the second apron roller seat 421 and the third apron roller seat 521 are each provided with a groove, and the boss and the groove form a tenon-mortise structure, which can ensure that the second apron roller assembly 42 and the third apron roller assembly 52 respectively follow the second roller assembly 41 and the third roller assembly 51 to move synchronously when the second roller assembly 41 and the third roller assembly 51 are moved and slid in a small range on the roller stool 11.

[0047] A limit switch 101 is arranged inside each apron roller seat, and a detection ring 10 is arranged on the piston rod 62, and the relative distance from the detection ring 10 to the lower end surface of the piston rod 62 is set as a constant distance.

[0048] Further, the mechanism further comprises a PLC controller connected with all single-shaft cylinders and all double-shaft cylinders, and the PLC controller controls all single-shaft cylinders and all double-shaft cylinders to switch between pressurizing and depressurizing states through electromagnetic valves.

[0049] Further, a pressure regulating valve is arranged on each pressurizing cylinder, and the pressure regulating valve is used for regulating the pressure of the pressurizing cylinder to the apron roller.

[0050] The control method of the apron roller pneumatic pressurizing mechanism of the drawing frame comprises the following steps:

[0051] S1: judging whether the apron roller pneumatic pressurizing mechanism needs to be adjusted in distance, if yes, executing step S2, otherwise executing step S3;

[0052] S2: stopping, adjusting the gauge on the operation screen of the drawing frame to make the pressurizing cylinders keep the piston rod 62 from pressing the positioning strips 21 and the apron roller 7, and to be in a semi-depressurizing state; and moving the second roller assembly 41 and the third roller assembly 51 to adjust to a proper gauge; and restarting after the adjustment is completed;

[0053] S3: judging whether the apron roller pneumatic pressurizing mechanism needs to be pressurized, if yes, executing step S4, otherwise maintaining the original state;

[0054] S4: clamping the 27 locking plates into the 36 fixed columns to lock the cradle 2; then triggering a pressurizing instruction on the operation screen, outputting a pressurizing instruction to the electromagnetic valves through the PLC controller, pressurizing the apron roller 7 by the pressurizing cylinders, and making the detection ring 10 contact the limit switch 101;

[0055] S5: manually adjust three pressure regulating valves to control the pressure of each group of pressurized cylinders, wherein the first pressure regulating valve controls the pressure of the pressurized cylinders of the guide apron roller assembly 33, the second pressure regulating valve controls the pressure of the pressurized cylinders of the first apron roller assembly 32, and the third pressure regulating valve controls the pressure of the pressurized cylinders of the second apron roller assembly 42 and the third apron roller assembly 52.

[0056] In the above working state, when the sliver is wound on the apron roller or the roller, the piston rod 62 is slightly lifted due to the pressure on the apron roller bearing shell 71, so that the detection ring 10 is disengaged from the limit switch 101, triggering the system shutdown instruction, and the cylinder is automatically depressurized, at the same time, the piston rod 62 will automatically press the positioning strip 21 upward, ensuring that the position of the apron roller assembly is not moved to avoid displacement. When the fault is eliminated, start the pressurization normal operation.

[0057] In the above embodiment, the pressurization mechanism of the present application is used for a single eye drawing frame, and the pressurization mechanism of the present application can also be used for a double eye drawing frame. When the pressurization mechanism of the present application is used for a double eye drawing frame, the pressurization mechanism is provided in two, and the two pressurization mechanisms are arranged side by side or symmetrically.

[0058] In this paper, the front, back, up, down and other orientation words are defined by the position of the parts in the drawing and the position of the parts relative to each other in the drawing, only to express the clarity and convenience of the technical scheme. It should be understood that the use of the orientation words should not limit the scope of the application claimed.

[0059] In the case of no conflict, the above embodiments and features in the embodiments can be combined with each other.

[0060] The above is only the preferred embodiment of the present application, and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A pneumatic presser mechanism for a skin roller of a drawing frame, characterized in that: The base, the roller stool, the cradle and the three traction assemblies are included. The cradle and the roller stool are fixed on the base, and the relative position of the roller stool and the cradle on the base is fixed Each traction assembly includes a roller assembly and a skin roller assembly. The three traction assemblies are arranged side by side, and the three traction assemblies are respectively a first traction assembly, a second traction assembly and a third traction assembly. The first traction assembly includes a roller assembly fixed on the roller stool, a guide skin roller assembly and a skin roller assembly fixed on the cradle. The second and third traction assemblies respectively include a second and third roller assembly slidably arranged on the roller stool, and a second and third skin roller assembly slidably arranged on the guide rail and the positioning strip. The roller seat of the second and third traction assemblies is provided with a boss, and the skin roller seat of the second and third traction assemblies is provided with a groove. Each skin roller assembly has two identical skin roller seats and pressure cylinders at both ends, the pressure cylinders are vertically installed above the skin roller seats, and the piston rods of the pressure cylinders penetrate the skin roller seats and act on the bearing shells of the skin rollers. The cradle includes two fixed plates and a connecting plate, the two fixed plates are arranged in parallel along the left-right direction, and the two ends of the connecting plate are fixedly connected with the rear sides of the two fixed plates. The cradle includes a rotating arm, and the rotating arm is provided with a positioning strip along the left-right direction.

2. A pneumatic presser mechanism for a skin roller of a drawing frame according to claim 1, characterized in that: The pressure cylinders of the first traction assembly are single-out shaft cylinders, and the pressure cylinders of the second and third traction assemblies are double-out shaft cylinders.

3. A pneumatic presser mechanism for the roller of a drawing frame according to claim 1, characterized in that: The rotating arm is further provided with a locking plate, the locking plate is fixed on the fixed plate by a rotating shaft and can rotate around the rotating shaft, a fixed column is installed on the pad and fixed with the roller stool, the two ends of the locking plate are respectively provided with a bayonet, the upper end of the fixed column is provided with a clamping groove, and the bayonet and the clamping groove are one-to-one corresponding and matched.

4. The air pressure mechanism of the godet roll of the drawing frame according to claim 1, characterized in that: The piston rod of the double-out shaft cylinder is provided with a detection ring, and the lower end surface of the detection ring is set at a constant distance from the lower end surface of the piston rod.

5. The air pressure mechanism of the godet roll of the drawing frame according to claim 1, characterized in that: The pressure mechanism further includes a PLC controller connected with all single-out shaft cylinders and all double-out shaft cylinders, and the PLC controller controls the switching of all single-out shaft cylinders and all double-out shaft cylinders between pressure and pressure relief states.

6. A control method for the air pressure application mechanism of the roller of a drawing frame according to any one of the preceding claims, characterized in that, Each pressure cylinder is provided with a pressure regulating valve for adjusting the pressure of the pressure cylinder on the skin roller. The method includes the following steps: S1: determining whether the skin roller pneumatic pressure mechanism needs to be adjusted in distance, if yes, executing step S2, otherwise executing step S3; S2, stop, send adjustment gauge command, make pressurized cylinder move to keep piston rod not to press positioning strip and not to press skin roller, in semi-unpressurized state; and move second roller assembly, third roller assembly to adjust to appropriate gauge; after adjustment, restart running; S3: judge whether the skin roller pneumatic pressurizing mechanism needs to be pressurized, if yes, execute step S4, otherwise maintain the original state; S4: clamp the locking plate into the fixed column to lock the cradle; send pressurizing command, each pressurized cylinder pressurizes the skin roller, detect the ring contact limit switch; S5: manually adjust the pressure of each pressurized cylinder, wherein the first pressure regulating valve controls the pressure of the pressurized cylinder of the guide skin roller assembly, the second pressure regulating valve controls the pressure of the pressurized cylinder of the first skin roller assembly, and the third pressure regulating valve controls the pressure of the pressurized cylinder of the second skin roller assembly and the third skin roller assembly.

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