Hot box drawing machine applied to production of ultra-high molecular weight polyethylene fibers

Abstract

The utility model discloses a hot box drawing machine applied to ultra-high molecular weight polyethylene fiber production. The hot box drawing machine is reasonable and simple in structure, low in investment, uniform in temperature and low in operation cost. The equipment base comprises a thick vertical plate, a bottom plate and a top plate; the drafting hot roller system comprises a plurality of groups of hot rollers; an inlet godet; an outlet godet; the upper heat preservation cover assembly comprises an upper heat preservation cover and a first lifting driving mechanism; the lower heat preservation cover assembly comprises a lower heat preservation cover and a second lifting driving mechanism; a drafting heating cavity is defined by the upper heat preservation cover and the lower heat preservation cover, an inlet godet, a plurality of sets of hot rollers and an outlet godet are sequentially arranged on the drafting heating cavity in the length direction, a power speed reduction module of the drafting hot roller system is fixedly arranged on the back side of the thick vertical plate, and the first lifting driving mechanism drives the upper heat preservation cover to ascend and descend. The second lifting driving mechanism drives the lower heat preservation cover to ascend and descend.

Description

Technical Field

[0001] The utility model relates to the technical field of high-performance fiber production, in particular to a hot box drawing machine used for the production of ultra-high molecular weight polyethylene fibers. Background Art

[0002] Fiber hot drawing is a necessary production process for the production of high-performance fibers such as ultra-high molecular weight polyethylene fiber, aramid, and carbon fiber. At present, domestic technology uses a combination of multiple drawing machines and drawing hot boxes for production, in which the drawing machine provides the drawing power and the drawing hot box heats the fiber. The drawing hot box uses hot air circulation heating, and uneven temperatures will appear on both sides and ends of the internal channel, which leads to uneven heating temperature of the fiber and the quality of the fiber cannot be guaranteed. In addition, this combination requires eight to ten single-machine equipment to complete the combination. It has a complex structure, a long route, high equipment investment cost, and high operating energy consumption, which hinders the reduction of fiber costs. Therefore, it is urgent to provide a new fiber hot drawing solution to solve the above-mentioned technical problems. Utility Model Content

[0003] In view of the above problems, the utility model provides a hot box drawing machine for ultra-high molecular weight polyethylene fiber production, which has a reasonable and simple structure, low investment, uniform temperature and low operating cost.

[0004] A hot box drawing machine for producing ultra-high molecular weight polyethylene fibers, characterized in that it comprises:

[0005] Equipment base, which includes a thick vertical plate, a bottom plate, and a top plate;

[0006] A drafting hot roller system, which includes several sets of hot rollers;

[0007] Entrance godet;

[0008] Exit godet roller;

[0009] An upper heat-insulating cover assembly, comprising an upper heat-insulating cover and a first lifting drive mechanism;

[0010] and a lower heat-insulating cover assembly, which includes a lower heat-insulating cover and a second lifting drive mechanism;

[0011] The upper heat-insulating cover and the lower heat-insulating cover enclose a stretching and heating chamber, and the stretching and heating chamber is sequentially provided with an inlet guide roller, several groups of hot rollers, and an outlet guide roller along the length direction. The power deceleration module of the stretching and hot roller system is fixed on the back side of the thick vertical plate. The first lifting drive mechanism is fixed on the lower surface of the top plate, and the first lifting drive mechanism drives the upper heat-insulating cover to rise and fall. The second lifting drive mechanism is fixed on the upper surface of the bottom plate, and the second lifting drive mechanism drives the lower heat-insulating cover to rise and fall.

[0012] It is further characterized by:

[0013] The drafting hot roller system includes 2N groups of hot rollers, which are divided into N levels of traction. The 2N groups of hot rollers are sequentially installed from front to back in the longitudinal direction of the front face of the thick vertical plate. The upper heat insulation cover is located directly above the drafting hot roller system, and the lower heat insulation cover is located directly below the drafting hot roller system. The inlet godet is located at the front end of the drafting hot roller system, and the outlet godet is located at the rear end of the drafting hot roller system.

[0014] The drafting hot roller system is composed of 2N hot rollers of the same diameter. Every two hot rollers form a drafting group, forming a total of N drafting groups. The hot rollers of the N drafting groups are arranged in sequence on the same horizontal plane from front to back. The distance between the two hot rollers in the same drafting group is smaller than the distance between adjacent rollers in the groups.

[0015] Each drafting group corresponds to a power reduction module to control the speed. The speed increases gradually from the first-level drafting group to the N-level drafting group to achieve the drafting effect.

[0016] Aluminum foil is pasted on the inside of the upper and lower heat-insulating covers. The upper and lower heat-insulating covers are provided with arc-shaped covers in the areas corresponding to the heat rollers. When closed, a gap is left between the inner wall of the arc-shaped cover and the roller surface of the heat roller.

[0017] An inlet adjustment door is provided just above the inlet godet roller. The inlet adjustment door is installed at the inlet notch of the upper heat-insulating cover. When the heat-insulating cover is closed, the inlet adjustment door is raised or lowered to control the size of the hot box drawing machine inlet.

[0018] An outlet regulating door is provided just below the outlet godet roller. The outlet regulating door is installed at the outlet notch of the lower heat preservation cover. When the heat preservation cover is closed, the outlet regulating door is raised or lowered to control the outlet size of the hot box drawing machine.

[0019] The top surface of the upper heat-insulating cover is provided with a first mounting frame, and a plurality of upwardly protruding first guide shafts are provided on the first mounting frame. The first lifting drive mechanism includes a plurality of first linear guide sleeves and at least one first lifting cylinder. The cylinder seat of the first lifting cylinder is fixedly mounted on the lower surface of the top plate, and the lower output piston of the first lifting cylinder is fixedly connected to the first mounting frame. The first guide shafts are correspondingly inserted into the first linear guide sleeves directly above. All the first lifting cylinders are lifted and lowered synchronously to drive the upper heat-insulating cover to lift and lower.

[0020] The bottom surface of the lower heat-insulating cover is provided with a second mounting frame, and the second mounting frame is provided with a plurality of downwardly protruding second guide shafts. The second lifting drive mechanism includes a plurality of second linear guide sleeves and at least one second lifting cylinder. The cylinder seat of the second lifting cylinder is fixedly mounted on the upper surface of the bottom plate. The upper output piston of the second lifting cylinder is fixedly connected to the second mounting frame. The second guide shafts are correspondingly inserted into the second linear guide sleeves directly above. All the second lifting cylinders are lifted and lowered synchronously to drive the upper heat-insulating cover to lift and lower.

[0021] The mutually contacting edges of the upper heat-insulating cover and the lower heat-insulating cover are respectively provided with heat-insulating cotton, which ensures that the mechanism will not have a hard collision and ensures the heat-insulating effect of the entire drawing and heating chamber.

[0022] After adopting the structure of the utility model, the roller surface of the hot roller directly heats the fiber, and the fiber is stretched through the speed difference of the multi-stage drafting group. The upper and lower insulation covers are reasonably designed, so that the fiber is heated at a uniform temperature, the insulation effect is good, and the operating energy consumption is low. Moreover, one device can replace the combination of multiple drafting machines and drafting hot boxes, reducing the length of the production line and lowering the investment cost. The temperature and speed of the hot roller can be controlled separately, which is suitable for different product processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0024] Figure 2 This is a side view of the assembly of the hot roller and the power deceleration module of the present invention;

[0025] The names corresponding to the serial numbers in the figure are as follows:

[0026] Equipment base 10, entrance adjustment door 11, entrance wire guide roller 12, exit adjustment door 13, exit wire guide roller 14, thick vertical plate 15, bottom plate 16, top plate 17, upper thermal insulation cover 20, lower thermal insulation cover 30, first lifting drive mechanism 40, first linear guide sleeve 41, first lifting cylinder 42, second lifting drive mechanism 50, second linear guide sleeve 51, second lifting cylinder 52, first mounting frame 60, first guide shaft 61, second mounting frame 70, second guide shaft 71, drafting hot roller system 100, first hot roller 101, second hot roller 102, third hot roller 103, fourth hot roller 104, fifth hot roller 105, sixth hot roller 106, seventh hot roller 107, eighth hot roller 108, power deceleration module 110. DETAILED DESCRIPTION

[0027] A hot box drawing machine for the production of ultra-high molecular weight polyethylene fibers, see Figure 1 and Figure 2, which includes an equipment base 10, a drafting hot roller system 100, an inlet godet roller 12, an outlet godet roller 14, an upper heat preservation cover assembly, and a lower heat preservation cover assembly;

[0028] The equipment base 10 includes a thick vertical plate 15, a bottom plate 16, and a top plate 17;

[0029] The drafting hot roller system includes several groups of hot rollers;

[0030] The upper heat-insulating cover assembly includes an upper heat-insulating cover 20 and a first lifting drive mechanism 40;

[0031] The lower heat-insulating cover assembly includes a lower heat-insulating cover 30 and a second lifting drive mechanism 50;

[0032] The upper insulation cover 20 and the lower insulation cover 30 are enclosed to form a stretching and heating chamber. The stretching and heating chamber is sequentially provided with an inlet guide roller 12, several groups of hot rollers, and an outlet guide roller 14 along the length direction. The power deceleration module 110 of the stretching hot roller system 100 is located on the back side of the thick vertical plate 15 and is fixed. The first lifting drive mechanism 40 is fixed on the lower surface of the top plate 17. The first lifting drive mechanism 40 drives the upper insulation cover 20 to rise and fall. The second lifting drive mechanism 50 is fixed on the upper surface of the bottom plate 16. The second lifting drive mechanism 50 drives the lower insulation cover 30 to rise and fall.

[0033] The drafting hot roller system 100 includes 2N sets of hot rollers, which are divided into N levels of traction, where N is a natural number greater than or equal to 2. The 2N sets of hot rollers are sequentially installed from front to back in the longitudinal direction of the front face of the thick vertical plate 15. The upper insulation cover 20 is located directly above the drafting hot roller system 100, and the lower insulation cover 30 is located directly below the drafting hot roller system 100. The inlet godet 12 is located at the front end of the drafting hot roller system 100, and the outlet godet 14 is located at the rear end of the drafting hot roller system 100.

[0034] The drafting hot roller system 100 is composed of 2N hot rollers of the same diameter. Every two hot rollers form a drafting group, forming a total of N drafting groups. The hot rollers of the N drafting groups are arranged sequentially from front to back on the same horizontal plane. The distance between the two hot rollers in the same drafting group is smaller than the distance between adjacent rollers in the other groups.

[0035] The two hot rollers of each drafting group correspond to a power reduction module 110 to control the speed. The speed increases gradually from the first drafting group to the Nth drafting group to achieve the drafting effect.

[0036] Aluminum foil is pasted inside the upper and lower heat-insulating covers 20 and 30. Curved covers are provided in the areas corresponding to the heat rollers. When closed, a gap is left between the inner wall of the curved cover and the roller surface of the heat roller.

[0037] An inlet regulating door 11 is provided just above the inlet godet 12. The inlet regulating door 11 is installed at the inlet notch of the upper heat-insulating cover 20. When the heat-insulating cover is closed, the inlet regulating door 11 is raised or lowered to control the size of the hot box drawing machine inlet.

[0038] An outlet regulating door 13 is provided just below the outlet godet 14. The outlet regulating door 13 is installed at the outlet notch of the lower heat preservation cover 30. When the heat preservation cover is closed, the outlet regulating door 14 is raised or lowered to control the outlet size of the hot box drawing machine.

[0039] The top surface of the upper heat-insulating cover 20 is provided with a first mounting frame 60, on which a plurality of upwardly protruding first guide shafts 61 are provided. The first lifting drive mechanism 40 includes a plurality of first linear guide sleeves 41 and at least one first lifting cylinder 42. The cylinder seat of the first lifting cylinder 42 is fixedly mounted on the lower surface of the top plate 17. The lower output piston of the first lifting cylinder 42 is fixedly connected to the first mounting frame 60. The first guide shaft 61 is correspondingly inserted into the first linear guide sleeve 41 directly above. All the first lifting cylinders 42 rise and fall synchronously to drive the upper heat-insulating cover 20 to rise and fall.

[0040] A second mounting frame 70 is provided on the bottom surface of the lower heat-insulating cover 30. The second mounting frame 70 is provided with a plurality of downwardly protruding second guide shafts 71. The second lifting drive mechanism 50 includes a plurality of second linear guide sleeves 51 and at least one second lifting cylinder 52. The cylinder base of the second lifting cylinder 52 is fixedly mounted on the upper surface of the bottom plate 16. The upper output piston of the second lifting cylinder 52 is fixedly connected to the second mounting frame 70. The second guide shafts 71 are correspondingly inserted into the second linear guide sleeves 71 directly below. All the second lifting cylinders 72 rise and fall synchronously to drive the upper heat-insulating cover 30 to rise and fall.

[0041] The mutually contacting edges of the upper heat-insulating cover 20 and the lower heat-insulating cover 30 are respectively provided with heat-insulating cotton, which ensures that the mechanism will not have a hard collision and ensures the heat-insulating effect of the entire drawing and heating chamber.

[0042] In specific implementation, the first hot roller 101, the second hot roller 102, the third hot roller 103, the fourth hot roller 104, the fifth hot roller 105, the sixth hot roller 106, the seventh hot roller 107, and the eighth hot rollers 8-108 constitute a hot roller traction system, which are installed on the front of the thick vertical plate from front to back, and keep the center on a horizontal line. The diameter of the 8 hot rollers is 500 mm.

[0043] The first hot roller 101 and the second hot roller 102 form a first-level stretching group, the third hot roller 103 and the fourth hot roller 104 form a second-level stretching group, the fifth hot roller 105 and the sixth hot roller 106 form a third-level stretching group, and the seventh hot roller 107 and the eighth hot roller 108 form a fourth-level stretching group. The distance between the two hot rollers in the same stretching group is 10 mm, and the distance between adjacent roller surfaces between groups is 20 mm. Each stretching group has a power deceleration module 110 to control the rotation, and the temperature of each hot roller can be controlled individually. This design has better adaptability to the production process.

[0044] The upper insulation cover 20 is installed directly above the hot roller traction system, and the lower insulation cover 30 is installed directly below the hot roller traction system 100. As shown in the figure, there are 8 arc-shaped covers inside the upper insulation cover 20 and the lower insulation cover 30, which correspond to the 8 hot rollers one by one. When the insulation cover is closed, it just holds the hot roller. When closed, the distance between the arc-shaped cover and the corresponding roller surface of the hot roller is 50mm. There is insulation cotton inside the upper insulation cover 20 and the lower insulation cover 30, and the inner wall is covered with aluminum foil. This design has good insulation effect and low heat energy loss.

[0045] The first lifting cylinder controls the lifting of the upper heat-insulating cover 20, and the second lifting cylinder controls the lifting of the lower heat-insulating cover 30. When the upper heat-insulating cover 20 and the lower heat-insulating cover 30 are closed, the four sides are correspondingly fitted to achieve a heat-insulating effect.

[0046] In practice, the fiber enters the hot box drawing machine from above the entrance guide roller 12. The fiber then wraps around the hot rollers in the direction shown, passing through the first, second, third, fourth, fifth, sixth, seventh, and eighth hot rollers 101, 102, 103, 104, 105, 106, 107, and 108, before exiting from below the exit guide roller 14. An entrance adjustment door 11 is located directly above the entrance guide roller 12. This door is mounted at the front end of the upper insulation cover 20 and can be adjusted vertically. When the hot box drawing machine is closed, the size of the hot box drawing machine entrance can be adjusted by adjusting the position of the entrance adjustment door 11. An exit adjustment door 13 is located directly below the exit guide roller 14. This door is fixed to the rear end of the lower insulation cover 30 and can be adjusted vertically. When the hot box drawing machine is closed, the size of the hot box drawing machine exit can be adjusted by adjusting the position of the exit adjustment door 13. All heated rollers feature a 500mm diameter, ensuring the fiber's extended wrapping distance on the roller surface is sufficient for adequate heating and drafting quality. Direct fiber contact with the roller surface provides more uniform temperature and higher heating efficiency compared to traditional drafting hot-air boxes. The eight 500mm diameter heated rollers can be individually set in temperature, and combined with four drafting speed levels, they can adapt to various production processes. A single hot-box drafting machine can meet common fiber drafting requirements, replacing a combination of multiple drafting machines and drafting hot boxes. For more demanding fiber drafting requirements, two or more units can be used in tandem.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0048] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A hot box drawing machine for producing ultra-high molecular weight polyethylene fibers, characterized in that: It includes: Equipment base, which includes a thick vertical plate, a bottom plate, and a top plate; A drafting hot roller system, which includes several sets of hot rollers; Entrance godet; Exit godet roller; An upper heat-insulating cover assembly, comprising an upper heat-insulating cover and a first lifting drive mechanism; and a lower heat-insulating cover assembly, which includes a lower heat-insulating cover and a second lifting drive mechanism; The upper heat-insulating cover and the lower heat-insulating cover enclose a stretching and heating chamber, and the stretching and heating chamber is sequentially provided with an inlet guide roller, several groups of hot rollers, and an outlet guide roller along the length direction. The power deceleration module of the stretching and hot roller system is fixed on the back side of the thick vertical plate. The first lifting drive mechanism is fixed on the lower surface of the top plate, and the first lifting drive mechanism drives the upper heat-insulating cover to rise and fall. The second lifting drive mechanism is fixed on the upper surface of the bottom plate, and the second lifting drive mechanism drives the lower heat-insulating cover to rise and fall.

2. The hot box drawing machine for ultra-high molecular weight polyethylene fiber production according to claim 1, characterized in that: The stretching hot roller system includes 2N groups of hot rollers, which are divided into N levels of traction. The 2N groups of hot rollers are installed in sequence from front to back in the length direction of the front side of the thick vertical plate. The upper thermal insulation cover is located directly above the stretching hot roller system, and the lower thermal insulation cover is located directly below the stretching hot roller system. The inlet guide roller is located at the front end of the stretching hot roller system, and the outlet guide roller is located at the rear end of the stretching hot roller system.

3. The hot box drawing machine for ultra-high molecular weight polyethylene fiber production according to claim 2, characterized in that: The stretching hot roller system is composed of 2N hot rollers of the same diameter. Every two hot rollers are combined to form a stretching group, forming a total of N stretching groups. The hot rollers of the N stretching groups are arranged sequentially on the same horizontal plane from front to back. The distance between the two hot rollers in the same stretching group is smaller than the distance between adjacent rollers between groups.

4. The hot box drawing machine for ultra-high molecular weight polyethylene fiber production according to claim 3, characterized in that: Each drafting group corresponds to a power deceleration module to control the speed. The speed increases gradually from the first-level drafting group to the N-level drafting group to achieve the drafting effect.

5. The hot box drawing machine for ultra-high molecular weight polyethylene fiber production according to claim 1, characterized in that: Aluminum foil is pasted inside the upper and lower heat-insulating covers. Arc covers are provided in the areas of the upper and lower heat-insulating covers corresponding to the heat roller. When closed, a distance is left between the inner wall of the arc cover and the roller surface of the heat roller.

6. The hot box drawing machine for ultra-high molecular weight polyethylene fiber production according to claim 1, characterized in that: An entrance adjustment door is provided just above the entrance wire guide roller, and the entrance adjustment door is installed at the entrance notch position of the upper heat-insulating cover.

7. The hot box drawing machine for ultra-high molecular weight polyethylene fiber production according to claim 1, characterized in that: An outlet regulating door is provided just below the outlet wire guide roller, and the outlet regulating door is installed at the outlet notch position of the lower heat-insulating cover.

8. The hot box drawing machine for ultra-high molecular weight polyethylene fiber production according to claim 1, characterized in that: The top surface of the upper heat-insulating cover is provided with a first mounting frame, and a plurality of upward protruding first guide shafts are provided on the first mounting frame. The first lifting drive mechanism includes a plurality of first linear guide sleeves and at least one first lifting cylinder. The cylinder seat of the first lifting cylinder is fixedly mounted on the lower surface of the top plate, and the lower output piston of the first lifting cylinder is fixedly connected to the first mounting frame. The first guide shaft is correspondingly inserted into the first linear guide sleeve directly above. All the first lifting cylinders rise and fall synchronously to drive the upper heat-insulating cover to rise and fall.

9. The hot box drawing machine for ultra-high molecular weight polyethylene fiber production according to claim 1, characterized in that: The bottom surface of the lower heat-insulating cover is provided with a second mounting frame, and the second mounting frame is provided with a plurality of downwardly protruding second guide shafts. The second lifting drive mechanism includes a plurality of second linear guide sleeves and at least one second lifting cylinder. The cylinder seat of the second lifting cylinder is fixedly mounted on the upper surface of the base plate, and the upper output piston of the second lifting cylinder is fixedly connected to the second mounting frame. The second guide shaft is correspondingly inserted into the second linear guide sleeve directly above. All the second lifting cylinders rise and fall synchronously to drive the upper heat-insulating cover to rise and fall.

10. The hot box drawing machine for ultra-high molecular weight polyethylene fiber production according to claim 1, characterized in that: The mutually contacting edges of the upper heat-insulating cover and the lower heat-insulating cover are respectively provided with heat-insulating cotton.

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