CN212072650U - Hot press device for manufacturing polytetrafluoroethylene - Google Patents
Hot press device for manufacturing polytetrafluoroethylene Download PDFInfo
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- CN212072650U CN212072650U CN202020769015.5U CN202020769015U CN212072650U CN 212072650 U CN212072650 U CN 212072650U CN 202020769015 U CN202020769015 U CN 202020769015U CN 212072650 U CN212072650 U CN 212072650U
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Abstract
The utility model discloses a hot press unit that polytetrafluoroethylene made, including supporting mechanism, still including being used for preheating polytetrafluoroethylene preheating the mechanism and be used for carrying out hot briquetting's hot pressing mechanism and being used for the cooling body of slow cooling to polytetrafluoroethylene, the supporting mechanism upper end is connected preheat the mechanism, it is provided with to preheat the mechanism discharge end hot pressing mechanism, hot pressing mechanism discharge end is provided with cooling body, the last power unit that is used for the conveying that is provided with of supporting mechanism, hot pressing mechanism power end is connected with adjustment mechanism. The utility model discloses the utilization is preheated the mechanism and can be preheated polytetrafluoroethylene before carrying out the hot pressing to improve the shaping efficiency in later stage, utilize cooling body to carry out degressive cooling of temperature to polytetrafluoroethylene, avoid the abrupt temperature drop to influence the shaping effect.
Description
Technical Field
The utility model relates to a polytetrafluoroethylene processing field especially relates to hot press unit that polytetrafluoroethylene made.
Background
Polytetrafluoroethylene, commonly referred to as "non-stick coatings" or "easy-to-clean materials". The material has the characteristics of acid resistance, alkali resistance and various organic solvents resistance, and is almost insoluble in all solvents. Meanwhile, the polytetrafluoroethylene has the characteristic of high temperature resistance, has extremely low friction coefficient, can be used for lubricating, and becomes an ideal coating for easily cleaning the inner layer of the water pipe.
In common polytetrafluoroethylene hot briquetting, all use hot briquetting commonly used and carry out hot briquetting to polytetrafluoroethylene, because polytetrafluoroethylene own characteristic has the temperature toleration, then need the high temperature just can carry out the shaping, but in the hot press use, naked equipment hardly guarantees to last high temperature always, causes polytetrafluoroethylene machining efficiency slow excessively to need the cooling after the shaping, also can influence polytetrafluoroethylene's shaping effect if the temperature filtration temperature slump.
Disclosure of Invention
The present invention is directed to a hot press apparatus made of polytetrafluoroethylene for solving the above problems.
In order to achieve the above purpose, the present invention is realized by the following technical solution: hot press unit that polytetrafluoroethylene made, including supporting mechanism, still including being used for carrying on preheating polytetrafluoroethylene the mechanism with be used for carrying on hot briquetting's hot pressing mechanism and be used for the cooling body of slow cooling to polytetrafluoroethylene, the supporting mechanism upper end is connected preheat the mechanism, it is provided with to preheat the mechanism discharge end hot pressing mechanism, hot pressing mechanism discharge end is provided with cooling body, the last power unit that is used for the conveying that is provided with of supporting mechanism, hot pressing mechanism power end is connected with adjustment mechanism.
Preferably: the adjusting mechanism comprises an adjusting frame, supporting wheels, first wheel frames and a fixing frame, the adjusting frame is connected with the hot pressing mechanism, the two supporting wheels are arranged inside the adjusting frame and connected with the first wheel frames, first supporting springs are arranged between the first wheel frames, and the fixing frame is arranged outside the first supporting springs.
So set up, after adjusting two interval between the linkage sprocket, the linkage chain begins not hard up, at this moment first supporting spring supports two first wheel carrier with the supporting wheel makes the linkage chain struts, has guaranteed the elasticity of linkage chain, thereby guarantees the transmission efficiency of linkage chain.
Preferably: the adjusting mechanism comprises an adjusting frame, supporting wheels, a second wheel frame and a fixing seat, the adjusting frame is connected with the hot pressing mechanism, the two supporting wheels are arranged inside the adjusting frame, the supporting wheels are connected with the second wheel frame, one end of the second wheel frame is connected with the fixing seat in a sliding mode, and a second supporting spring is arranged between the second wheel frame and the fixing seat.
So set up, after adjusting two the interval between the linkage sprocket, the linkage chain begins not hard up, two this moment second supporting spring supports the second wheel carrier with the supporting wheel makes the supporting wheel will the linkage chain struts, has guaranteed the elasticity of linkage chain, thereby guarantees the transmission efficiency of linkage chain.
Preferably: the supporting mechanism comprises a bearing frame, a stand column, a damping seat and an object stage, the lower end of the bearing frame is connected with the stand column, the lower end of the stand column is connected with the damping seat, the two ends of the bearing frame are respectively provided with the object stage, and a motor mounting rack is arranged between the stand columns.
So set up, the carrier plays the bearing effect, the stand plays supporting role.
Preferably: preheating mechanism includes first seal box, heater strip, heating power circulating pump, first seal box is inside to be provided with the heater strip, threaded connection is passed through to first seal box rear end heating power circulating pump, cooling body includes third seal box, first fan, electric heat silk dish, second fan, third seal box is inside to be provided with first fan, first fan one side is provided with the second fan, second fan one side is provided with cooling blower, first fan with second fan upper end all is provided with the electric heat silk dish, and two the electric heat silk dish temperature is degressive step by step.
So set up, pass through as the polytetrafluoroethylene raw materials the transmission shaft transmits to behind the first seal box inboard, the heater strip heaies up to 200 degrees, simultaneously heat circulating pump starts, heat circulating pump will the inside hot inner loop that forms of first seal box has guaranteed that the temperature preheats polytetrafluoroethylene simultaneously, and is convenient hot briquetting of hot press mechanism, and after hot briquetting, first fan the second fan cooling blower opens, two the electric heat silk dish sends the heat of different temperatures, carries out degressive cooling step by step to the material after the hot briquetting, avoids the temperature dip to influence the shaping effect.
Preferably: hot pressing mechanism includes second seal box, first hot pressing roller, second hot pressing roller, center pin, second seal box is inside to be provided with first hot pressing roller, first hot pressing roller downside is provided with second hot pressing roller, first hot pressing roller all be provided with on the second hot pressing roller the center pin, upper end the center pin both ends are connected with the regulating block, regulating block sliding connection is inboard at spacing, the regulating block with be provided with adjusting bolt between the spacing, the linkage sprocket is all connected to the center pin rear end, the linkage sprocket passes through the linkage chain and connects, linkage sprocket power end is connected power unit output sprocket.
So set up, work as output sprocket arrives power transmission behind the sprocket, the sprocket passes through the linkage chain drives another the sprocket is simultaneously on the sprocket the center pin drives first hot pressing roller with second hot pressing roller rotates, and passes through adjusting bolt adjusts first hot pressing roller with interval between the second hot pressing roller, the switch-on first hot pressing roller with the power of second hot pressing roller makes first hot pressing roller with second hot pressing roller generates heat, carries out hot briquetting to the material.
Preferably: the power mechanism comprises a motor, a transmission chain wheel box and a transmission shaft, the transmission shaft is connected with the supporting mechanism and the inner side of the bearing frame, the power end of the transmission shaft is connected with the transmission chain wheel box, the power end of the transmission chain wheel box is connected with the transmission chain wheel, the transmission chain wheel is connected onto the motor, and the power output end of the transmission chain wheel box is connected with an output chain wheel.
So set up, the motor plays provides kinetic energy effect, drive sprocket case, the transmission shaft plays the drive effect.
Compared with the prior art, the beneficial effects of the utility model are as follows:
1. the preheating mechanism can preheat the polytetrafluoroethylene before hot pressing, so that the later molding efficiency is improved;
2. utilize cooling body can carry out the degressive cooling of temperature to polytetrafluoroethylene, avoid the abrupt temperature drop to influence the shaping effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic view of a first structure of a hot press apparatus for producing polytetrafluoroethylene according to the present invention;
FIG. 2 is a second schematic structural view of a hot press apparatus made of PTFE according to the present invention;
FIG. 3 is a schematic structural view of a preheating mechanism of a hot-pressing apparatus made of polytetrafluoroethylene according to the present invention;
FIG. 4 is a schematic structural view of a hot pressing mechanism of a hot pressing apparatus made of polytetrafluoroethylene according to the present invention;
FIG. 5 is a schematic view of a cooling mechanism of a hot press apparatus made of PTFE according to the present invention;
FIG. 6 is a schematic view of the structure of the fixing frame of the hot pressing device made of PTFE of the present invention;
fig. 7 is a schematic structural view of a second wheel frame of the hot pressing device made of polytetrafluoroethylene according to the present invention.
The reference numerals are explained below:
1. a support mechanism; 2. a preheating mechanism; 3. a hot-pressing mechanism; 4. a cooling mechanism; 5. a power mechanism; 6. an adjustment mechanism; 11. a carrier; 12. a column; 13. a shock absorbing seat; 14. an object stage; 15. a motor mounting bracket; 21. a first seal box; 22. heating wires; 23. a thermodynamic cycle pump; 31. a second seal box; 32. a first hot press roll; 33. a second hot press roll; 34. a central shaft; 35. an adjusting block; 36. a limiting frame; 37. adjusting the bolt; 38. a link sprocket; 39. a linkage chain; 41. a third seal box; 42. a first fan; 43. an electric heating wire disc; 44. a second fan; 45. a cooling fan; 51. an electric motor; 52. a drive sprocket; 53. a drive sprocket box; 54. a drive shaft; 55. an output sprocket; 61. an adjusting bracket; 62. a support wheel; 63. a first wheel carrier; 64. a fixed mount; 65. a first support spring; 611. a second wheel carrier; 612. a fixed seat; 613. a second support spring.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be further explained with reference to the accompanying drawings:
hot press unit that polytetrafluoroethylene made, including supporting mechanism 1, still including being used for preheating mechanism 2 and being used for carrying out hot briquetting's hot pressing mechanism 3 and being used for the cooling body 4 of slow cooling with polytetrafluoroethylene with preheating mechanism 2, supporting mechanism 1 upper end is connected and is preheated mechanism 2, preheat 2 discharge ends of mechanism and be provided with hot pressing mechanism 3, hot pressing mechanism 3 discharge end is provided with cooling body 4, the last power unit 5 that is used for the conveying that is provided with of supporting mechanism 1, the 3 power ends of hot pressing mechanism are connected with adjustment mechanism 6.
Example 1
As shown in fig. 1 to 6, the adjusting mechanism 6 includes an adjusting frame 61, supporting wheels 62, first wheel frames 63, and a fixing frame 64, the adjusting frame 61 is connected to the hot pressing mechanism 3, two supporting wheels 62 are disposed inside the adjusting frame 61, the supporting wheels 62 are connected to the first wheel frames 63, a first supporting spring 65 is disposed between the two first wheel frames 63, and the fixing frame 64 is disposed outside the first supporting spring 65, so that the linkage chain 39 starts to loosen after the distance between the two linkage sprockets 38 is adjusted, and at this time, the first supporting spring 65 supports the two first wheel frames 63 and the supporting wheels 62, so that the linkage chain 39 is supported, the tightness of the linkage chain 39 is ensured, and the transmission efficiency of the linkage chain 39 is ensured; the supporting mechanism 1 comprises a bearing frame 11, upright posts 12, a shock absorption seat 13 and an object stage 14, wherein the lower end of the bearing frame 11 is connected with the upright posts 12, the lower ends of the upright posts 12 are connected with the shock absorption seat 13, the object stage 14 is respectively arranged at two ends of the bearing frame 11, a motor mounting frame 15 is arranged between the upright posts 12, the bearing frame 11 plays a bearing role, and the upright posts 12 play a supporting role; the preheating mechanism 2 comprises a first seal box 21, a heating wire 22 and a heat circulating pump 23, the heating wire 22 is arranged in the first seal box 21, the rear end of the first seal box 21 is connected with the heat circulating pump 23 through threads, the cooling mechanism 4 comprises a third seal box 41, a first fan 42, electric heating wire discs 43 and a second fan 44, the first fan 42 is arranged in the third seal box 41, the second fan 44 is arranged on one side of the first fan 42, a cooling fan 45 is arranged on one side of the second fan 44, the electric heating wire discs 43 are arranged at the upper ends of the first fan 42 and the second fan 44, the temperatures of the two electric heating wire discs 43 are gradually decreased, when polytetrafluoroethylene raw materials are transmitted to the inner side of the first seal box 21 through a transmission shaft 54, the heating wire 22 is heated to 200 ℃, the heat circulating pump 23 is started, the heat circulating pump 23 forms a heat internal circulation in the first seal box 21, the temperature is ensured to be preheated simultaneously, the hot-press forming of the hot-press mechanism 3 is facilitated, after the hot-press forming, the first fan 42, the second fan 44 and the cooling fan 45 are started, the two electric heating wire discs 43 emit heat with different temperatures, the temperature of the hot-press formed material is gradually reduced, and the forming effect is prevented from being influenced by sudden temperature drop; the hot pressing mechanism 3 comprises a second sealing box 31, a first hot pressing roller 32, a second hot pressing roller 33 and a central shaft 34, the first hot pressing roller 32 is arranged in the second sealing box 31, the second hot pressing roller 33 is arranged on the lower side of the first hot pressing roller 32, the central shaft 34 is arranged on each of the first hot pressing roller 32 and the second hot pressing roller 33, two ends of the central shaft 34 at the upper end are connected with adjusting blocks 35, the adjusting blocks 35 are connected to the inner side of a limiting frame 36 in a sliding manner, an adjusting bolt 37 is arranged between each adjusting block 35 and the limiting frame 36, the rear end of each central shaft 34 is connected with a linkage chain wheel 38, the linkage chain wheels 38 are connected through linkage chains 39, the power ends of the linkage chain wheels 38 are connected with output chain wheels 55 of the power mechanism 5, after the output chain wheels 55 transmit power to the linkage chain wheels 38, the linkage chain wheels 38 drive another linkage chain wheel 38 through the linkage chains 39, and simultaneously the central, the distance between the first hot-pressing roller 32 and the second hot-pressing roller 33 is adjusted through an adjusting bolt 37, and the power supply of the first hot-pressing roller 32 and the second hot-pressing roller 33 is switched on to enable the first hot-pressing roller 32 and the second hot-pressing roller 33 to generate heat, so that the material is subjected to hot-pressing molding; the power mechanism 5 comprises a motor 51, a transmission chain wheel 52, a transmission chain wheel box 53 and a transmission shaft 54, the transmission shaft 54 is connected to the inner side of the bearing frame 11 of the support mechanism 1, the power end of the transmission shaft 54 is connected with the transmission chain wheel box 53, the power end of the transmission chain wheel box 53 is connected with the transmission chain wheel 52, the transmission chain wheel 52 is connected to the motor 51, the power output end of the transmission chain wheel box 53 is connected with an output chain wheel 55, the motor 51 plays a role in providing kinetic energy, and the transmission chain wheel 52, the transmission chain wheel box 53 and.
The working principle is as follows: after the motor 51 is started, the driving chain wheel 52, the driving chain wheel box 53 and the driving shaft 54 are driven, so that the drive shaft 54 transfers the raw material, after the raw material is introduced into the interior of the first seal box 21, after the polytetrafluoroethylene raw material is transferred to the inner side of the first sealing box 21 through the transmission shaft 54, the heating wire 22 is heated to 200 degrees, meanwhile, the heat circulating pump 23 is started, the heat circulating pump 23 forms a heat internal circulation in the first seal box 21, thereby ensuring that the polytetrafluoroethylene is preheated at the same time, facilitating the hot-press molding of the hot-press mechanism 3, and after the first hot-press roll 32 and the second hot-press roll 33 perform hot-press molding on the raw material, the first fan 42, the second fan 44 and the cooling fan 45 are turned on, the two electric heating wire discs 43 emit heat with different temperatures, the material after hot press forming is cooled gradually, and the forming effect is prevented from being influenced by sudden temperature drop.
Example 2
As shown in fig. 7, the difference between the embodiment 2 and the embodiment 1 is that the adjusting mechanism 6 includes an adjusting frame 61, a supporting wheel 62, a second wheel frame 611, and a fixing seat 612, the adjusting frame 61 is connected to the hot pressing mechanism 3, two supporting wheels 62 are disposed inside the adjusting frame 61, the supporting wheel 62 is connected to the second wheel frame 611, one end of the second wheel frame 611 is slidably connected to the fixing seat 612, a second supporting spring 613 is disposed between the second wheel frame 611 and the fixing seat 612, and when the distance between the two linked sprockets 38 is adjusted, the linked chain 39 starts to loosen, and at this time, the two second supporting springs 613 support the second wheel frame 611 and the supporting wheel 62, so that the supporting wheels 62 prop the linked chain 39 apart, thereby ensuring the tightness of the linked chain 39 and the transmission efficiency of the linked chain 39.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention.
Claims (7)
1. Hot press unit that polytetrafluoroethylene made, including supporting mechanism (1), its characterized in that: still including being used for preheating polytetrafluoroethylene preheating mechanism (2) and being used for carrying out hot briquetting's hot pressing mechanism (3) and being used for cooling body (4) of slow cooling to polytetrafluoroethylene, supporting mechanism (1) upper end is connected preheat mechanism (2), it is provided with to preheat mechanism (2) discharge end hot pressing mechanism (3), hot pressing mechanism (3) discharge end is provided with cooling body (4), be provided with power unit (5) that are used for the conveying on supporting mechanism (1), hot pressing mechanism (3) power end is connected with adjustment mechanism (6).
2. The hot press apparatus for polytetrafluoroethylene production according to claim 1, wherein: adjustment mechanism (6) are including alignment jig (61), supporting wheel (62), first wheel carrier (63), mount (64), alignment jig (61) are connected hot pressing mechanism (3), alignment jig (61) inside is provided with two supporting wheel (62), supporting wheel (62) are connected first wheel carrier (63), two be provided with first supporting spring (65) between first wheel carrier (63), first supporting spring (65) outside is provided with mount (64).
3. The hot press apparatus for polytetrafluoroethylene production according to claim 1, wherein: the adjusting mechanism (6) comprises an adjusting frame (61), supporting wheels (62), a second wheel frame (611) and a fixing seat (612), the adjusting frame (61) is connected with the hot pressing mechanism (3), two supporting wheels (62) are arranged inside the adjusting frame (61), the supporting wheels (62) are connected with the second wheel frame (611), one end of the second wheel frame (611) is connected with the fixing seat (612) in a sliding mode, and a second supporting spring (613) is arranged between the second wheel frame (611) and the fixing seat (612).
4. The hot press apparatus for polytetrafluoroethylene production according to claim 1, wherein: the supporting mechanism (1) comprises a bearing frame (11), a stand column (12), a damping seat (13) and an object stage (14), wherein the lower end of the bearing frame (11) is connected with the stand column (12), the lower end of the stand column (12) is connected with the damping seat (13), the two ends of the bearing frame (11) are respectively provided with the object stage (14), and a motor mounting frame (15) is arranged between the stand columns (12).
5. The hot press apparatus for polytetrafluoroethylene production according to claim 1, wherein: the preheating mechanism (2) comprises a first sealing box (21), a heating wire (22) and a heat circulating pump (23), the heating wire (22) is arranged in the first sealing box (21), the rear end of the first sealing box (21) is connected with the heat circulating pump (23) through threads, the cooling mechanism (4) comprises a third sealing box (41), a first fan (42), an electric heating wire disc (43) and a second fan (44), the first fan (42) is arranged in the third seal box (41), the second fan (44) is arranged on one side of the first fan (42), the cooling fan (45) is arranged on one side of the second fan (44), the upper ends of the first fan (42) and the second fan (44) are respectively provided with the electric heating wire discs (43), and the temperatures of the two electric heating wire discs (43) are gradually decreased.
6. The hot press apparatus for polytetrafluoroethylene production according to claim 1, wherein: the hot pressing mechanism (3) comprises a second seal box (31), a first hot pressing roller (32), a second hot pressing roller (33) and a central shaft (34), the first hot-pressing roller (32) is arranged in the second seal box (31), the second hot-pressing roller (33) is arranged at the lower side of the first hot-pressing roller (32), the first hot-pressing roller (32) and the second hot-pressing roller (33) are both provided with the central shaft (34), both ends of the central shaft (34) at the upper end are connected with adjusting blocks (35), the adjusting block (35) is connected to the inner side of the limiting frame (36) in a sliding way, an adjusting bolt (37) is arranged between the adjusting block (35) and the limiting frame (36), the rear ends of the central shafts (34) are connected with linkage chain wheels (38), the linkage chain wheels (38) are connected through linkage chains (39), the power end of the linkage chain wheel (38) is connected with the power mechanism (5).
7. The hot press apparatus for polytetrafluoroethylene production according to claim 1, wherein: power unit (5) include motor (51), drive sprocket (52), drive sprocket case (53), transmission shaft (54) are connected supporting mechanism (1) are inboard, transmission shaft (54) power end is connected drive sprocket case (53), drive sprocket case (53) power end is connected drive sprocket (52), drive sprocket (52) are connected on motor (51), drive sprocket case (53) power take off end is connected with output sprocket (55).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020769015.5U CN212072650U (en) | 2020-05-11 | 2020-05-11 | Hot press device for manufacturing polytetrafluoroethylene |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020769015.5U CN212072650U (en) | 2020-05-11 | 2020-05-11 | Hot press device for manufacturing polytetrafluoroethylene |
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| Publication Number | Publication Date |
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| CN212072650U true CN212072650U (en) | 2020-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020769015.5U Active CN212072650U (en) | 2020-05-11 | 2020-05-11 | Hot press device for manufacturing polytetrafluoroethylene |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113954339A (en) * | 2021-12-23 | 2022-01-21 | 天津氟膜新材料有限公司 | Polytetrafluoroethylene rotary cutting plate flattening device |
-
2020
- 2020-05-11 CN CN202020769015.5U patent/CN212072650U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113954339A (en) * | 2021-12-23 | 2022-01-21 | 天津氟膜新材料有限公司 | Polytetrafluoroethylene rotary cutting plate flattening device |
| CN113954339B (en) * | 2021-12-23 | 2022-04-19 | 天津氟膜新材料有限公司 | Polytetrafluoroethylene rotary cutting plate flattening device |
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Address after: 255000 No.7 Mintai Road, high tech Zone, Zibo City, Shandong Province Patentee after: Shandong Meifu Technology Co.,Ltd. Address before: 255000 No.7 Mintai Road, high tech Zone, Zibo City, Shandong Province Patentee before: Zibo Meifu New Materials Co.,Ltd. |