Prepreg tape hot-pressing processing equipment with auxiliary structure

Abstract

The invention provides prepreg tape hot-pressing processing equipment with an auxiliary structure, and relates to the field of prepreg tape processing, the prepreg tape hot-pressing processing equipment comprises a pressure auxiliary assembly, the pressure auxiliary assembly is composed of a pressure mechanism and a positioning mechanism, and under the action of the pressure auxiliary assembly, when a prepreg tape penetrates through a heating roller and a pressure roller at the initial stage, the positioning mechanism is used for positioning the prepreg tape; the pressure auxiliary assembly can automatically adapt to the thickness of the prepreg tape to change the use position, so that when the prepreg tape with any thickness is processed, the pressure auxiliary assembly can always apply constant pressure to the prepreg tape through the pressure roller, manual regulation and control are not needed, and the production efficiency is improved. The problems that an existing prepreg tape hot-pressing machining device is not provided with a structure which is adaptive to the thickness of a prepreg tape and exerts stable pressure, the distance between two roller bodies needs to be manually adjusted and controlled in the hot-pressing machining process so as to adapt to hot-pressing machining operation of prepreg tapes with different thicknesses, and the working efficiency is low are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prepreg processing, in particular to a prepreg hot-press processing equipment with an auxiliary structure. BACKGROUND

[0002] Prepreg is a kind of high-performance composite intermediate material, which is made of continuous fibers or unidirectional fabric that are parallel to each other and impregnated with resin. Hot-press processing of prepreg is an important composite forming process, which involves heating and pressing the prepreg in a hot-press equipment to cure it and form the desired composite parts. In a continuous hot-press equipment, the prepreg is continuously moving. This moving method is suitable for large-scale and continuous production processes. After unwinding, the prepreg passes through the heating and pressing area, completes the curing reaction, and then is wound up.

[0003] However, the existing prepreg hot-press processing equipment does not have a structure that can apply stable pressure according to the thickness of the prepreg. The thickness of the prepreg may vary depending on the type and performance requirements of the parts. Therefore, manual adjustment of the distance between the two rollers is required to adapt to the hot-press processing operation of prepreg with different thicknesses. This results in low work efficiency, poor flexibility and adaptability, and low practicality. SUMMARY

[0004] The present application relates to a prepreg hot-press processing equipment with an auxiliary structure, which has a pressure auxiliary assembly. The hot-press assembly can perform hot-press processing operation on continuous prepreg. When the prepreg passes through the heating roller and the pressure roller, the heating roller can heat the prepreg, and the pressure roller can apply pressure to the prepreg to realize hot-press processing operation. Under the action of the pressure auxiliary assembly, when the prepreg passes through the heating roller and the pressure roller initially, the pressure auxiliary assembly can automatically adapt to the thickness of the prepreg and change the use position, so that the pressure auxiliary assembly can always apply constant pressure to the prepreg through the pressure roller when processing prepreg with any thickness, without manual adjustment. The flexibility, adaptability and practicality are very strong.

[0005] In a first aspect, the present application provides a prepreg hot-press processing equipment with an auxiliary structure, which specifically includes a hot-press assembly, the hot-press assembly includes a base, a positioning column, a heating roller and a pressure roller, the positioning column is fixedly installed on the top of the base, and the heating roller is rotatably connected to the side of the positioning column; further comprising a pressure auxiliary assembly, the pressure auxiliary assembly is composed of a pressure mechanism and a positioning mechanism; The pressure mechanism comprises a follower block, an adjusting cylinder and a pressure seat, the follower block is inserted outside the positioning column, the adjusting cylinder is inserted outside the follower block, the pressure seat is inserted at the bottom of the adjusting cylinder, and the pressure roller is rotationally connected to the side of the pressure seat; the positioning mechanism comprises a linkage block and a positioning block, the linkage block is axially inserted inside the follower block, and the positioning block is radially inserted inside the follower block, two sets of the positioning mechanism are arranged inside the follower block, and the two sets of the positioning mechanism are symmetrical to each other.

[0006] In at least some embodiments, the bottom of the adjusting cylinder is provided with threads, the adjusting cylinder is screwed to the top of the pressure seat through the threads, the pressure auxiliary assembly is provided with two sets, and the two sets of the pressure auxiliary assembly are symmetrical to each other.

[0007] In at least some embodiments, the bottom of the follower block is provided with a pre-pressing top spring, and the two ends of the pre-pressing top spring are respectively abutted against the bottom of the follower block and the inside of the pressure seat.

[0008] In at least some embodiments, the top of the adjusting cylinder is provided with a limiting ring, and the inner diameter of the limiting ring is greater than the outer diameter of the pressure seat.

[0009] In at least some embodiments, the inside of the linkage block is provided with a positioning tension spring, and the two ends of the positioning tension spring are respectively fixedly connected to the inside of the linkage block and the inside of the follower block.

[0010] In at least some embodiments, the inside of the positioning block is provided with a linkage groove, and the side of the linkage block is provided with a linkage rod, the linkage rod is inserted into the inside of the linkage groove.

[0011] In at least some embodiments, the inside of the positioning column is provided with a track groove, and the inside of the follower block and the pressure seat is provided with a track block, the track block is inserted into the inside of the track groove.

[0012] In at least some embodiments, the side of the positioning block is provided with a positioning tooth block, and the inside of the positioning column is provided with a positioning tooth groove, the cross-sectional shape of the single tooth of the positioning tooth block and the single tooth groove of the positioning tooth groove is a right triangle, and when the positioning block moves upward, the straight edge of the tooth of the positioning tooth block and the tooth groove of the positioning tooth groove are clamped to each other.

[0013] In at least some embodiments, the top of the linkage block is provided with a trigger rod arranged radially along the adjusting cylinder, and the trigger rod abuts against the top of the adjusting cylinder.

[0014] The pre-impregnated tape hot pressing equipment with an auxiliary structure has the following beneficial effects.

[0015] The hot pressing assembly can perform hot pressing operations on continuous prepreg tapes. When the prepreg tape passes through the heating roller and the pressure roller, the heating roller heats the prepreg tape, and the pressure roller applies pressure to the prepreg tape, thereby realizing the hot pressing operation. With the help of the pressure auxiliary assembly, when the prepreg tape initially passes between the heating roller and the pressure roller, the pressure auxiliary assembly can automatically adapt to the thickness of the prepreg tape and change its position accordingly. Thus, when processing prepreg tapes of any thickness, the pressure auxiliary assembly can always apply constant pressure to the prepreg tape through the pressure roller without the need for manual adjustment, which improves the flexibility, adaptability and practicality of the device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0017] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the internal structure of the prepreg tape of the present invention when it does not pass between the heating roller and the pressure roller.

[0020] Figure 3 This is the present invention. Figure 2 Enlarged structural diagram of part A in the middle.

[0021] Figure 4 This is a structural diagram of the pressure assist component of the present invention after disassembly.

[0022] Figure 5 This is a schematic diagram of the internal structure of the thin prepreg tape during hot pressing processing according to the present invention.

[0023] Figure 6 This is the present invention. Figure 5 Enlarged structural diagram of part B in the middle.

[0024] Figure 7 This is a schematic diagram of the internal structure of the thicker prepreg tape of the present invention as it passes through the heating roller and the pressure roller.

[0025] Figure 8 This is the present invention. Figure 7 Enlarged structural diagram of part C in the middle.

[0026] Figure 9 This is the present invention. Figure 7 A schematic diagram of the internal structure of the prepreg belt after it passes through the heating roller and the pressure roller.

[0027] List of reference numerals 1. Hot pressing assembly; 101. Base; 102. Positioning column; 1021. Track groove; 1022. Positioning toothed groove; 103. Heating roller; 104. Pressure roller; 2. Pressure mechanism; 201. Follower block; 2011. Preload top spring; 202. Adjusting cylinder; 2021. Limiting ring; 203. Pressure seat; 2031. Track block; 3. Positioning mechanism; 301. Linkage block; 3011. Positioning tension spring; 3012. Linkage rod; 3013. Trigger rod; 302. Positioning block; 3021. Linkage groove; 3022. Positioning tooth block. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please refer to Figures 1 to 9 As shown: Example 1: This invention provides a prepreg tape hot pressing processing device with an auxiliary structure, including a hot pressing assembly 1. The hot pressing assembly 1 includes a base 101, a positioning column 102, a heating roller 103, and a pressure roller 104. The positioning column 102 is fixedly installed on the top of the base 101, and the heating roller 103 is rotatably connected to the side of the positioning column 102. During the hot pressing processing of the prepreg tape, the prepreg tape to be processed is installed on an unwinding device for unwinding. After unwinding, the prepreg tape passes through the heating roller 103 and the pressure roller 104 and is then wound again onto a winding device. When the prepreg tape passes through the heating roller 103 and the pressure roller 104, the heating roller 103 can heat the prepreg tape, and the pressure roller 104 can obtain pressure through the pressure auxiliary assembly and apply pressure to the prepreg tape, thereby realizing the hot pressing processing operation, which is convenient and flexible to use. It also includes a pressure auxiliary assembly, which consists of a pressure mechanism 2 and a positioning mechanism 3. The pressure mechanism 2 includes a follower block 201, an adjusting cylinder 202, and a pressure seat 203. The follower block 201 is inserted into the outside of the positioning column 102, and the adjusting cylinder 202 is inserted into the outside of the follower block 201. The pressure seat 203 is inserted into the bottom of the adjusting cylinder 202, and the pressure roller 104 is rotatably connected to the side of the pressure seat 203. The positioning mechanism 3 includes a linkage block 301 and a positioning block 302. The linkage block 301 is axially inserted into the inside of the follower block 201, and the positioning block 302 is radially inserted into the inside of the follower block 201. The positioning mechanism 3 has two sets inside the follower block 201, and the two sets of positioning mechanisms 3 are symmetrical to each other.

[0030] In this embodiment, the bottom of the adjusting cylinder 202 is threaded, and the adjusting cylinder 202 is screwed onto the top of the pressure seat 203 by the thread. There are two sets of pressure auxiliary components, and the two sets of pressure auxiliary components are symmetrical to each other. In use, the processing pressure provided by the pressure auxiliary components to the pressure roller 104 can be changed by rotating the adjusting cylinder 202. When the adjusting cylinder 202 is rotated, it can drive the pressure seat 203 to move axially along the positioning column 102 through the thread, thereby changing the working distance between the pressure seat 203 and the follower block 201, that is, changing the initial extension length of the pre-pressure top spring 2011, thereby changing the initial pressure value obtained by the pressure roller 104 through the pressure auxiliary components when it moves upward. It can adapt to the processing of prepreg tapes of different specifications and has strong adaptability.

[0031] In this embodiment, a pre-pressure top spring 2011 is provided at the bottom of the follower block 201, and the two ends of the pre-pressure top spring 2011 abut against the bottom of the follower block 201 and the inside of the pressure seat 203, respectively. In use, the pressure roller 104 can obtain pressure through the pressure auxiliary component and apply pressure to the prepreg tape, thereby realizing the hot pressing operation. When the prepreg tape passes between the heating roller 103 and the pressure roller 104, the tape body will drive the pressure roller 104 to move upward under the action of squeezing and abutting. Due to the positioning tooth block 3022 and the positioning tooth groove 1 Under the snapping action of the straight edge of the 022 tooth groove, the follower block 201 cannot move upward. Therefore, when the pressure roller 104 moves upward, it can only drive the pressure seat 203 and the adjusting cylinder 202 to move upward. When the pressure seat 203 moves upward, it can compress the pre-pressure top spring 2011, so that the pressure roller 104 can obtain processing pressure. Moreover, the pre-pressure top spring 2011 is in a pre-compressed state. Therefore, the pressure of the pre-pressure top spring 2011 during deformation does not start from zero, thus providing sufficient pressure for the prepreg tape to perform hot pressing processing, and ensuring stable use.

[0032] In this embodiment, the top of the regulating cylinder 202 is provided with a limiting ring 2021, and the inner diameter of the limiting ring 2021 is larger than the outer diameter of the pressure seat 203. This design can prevent the follower block 201 from coming out of the regulating cylinder 202, and ensure stable use.

[0033] In this embodiment, the positioning block 302 has a positioning tooth block 3022 on its side, and the positioning column 102 has a positioning groove 1022 inside. The cross-sectional shape of a single tooth of the positioning tooth block 3022 and a single groove of the positioning groove 1022 are both right-angled triangles. When the positioning block 302 moves upward, the straight edge of the tooth of the positioning tooth block 3022 and the straight edge of the groove of the positioning groove 1022 engage with each other. In use, the pressure assist component can automatically adapt to the thickness of the prepreg tape and change its position. Thus, when processing prepreg tape of any thickness, the pressure assist component can always apply constant pressure to the prepreg tape through the pressure roller 104 without manual adjustment. When the prepreg tape is thin, the upward stroke of the pressure roller 104 is not enough to drive the positioning block 302. Moving a sufficient distance releases the engagement between the positioning tooth block 3022 and the straight edge of the positioning tooth groove 1022. Therefore, the pressure auxiliary component does not change its position, maintaining the pressure within a suitable range. The top of the linkage block 301 is equipped with a trigger rod 3013 arranged radially along the adjusting cylinder 202, and the trigger rod 3013 abuts against the top of the adjusting cylinder 202. When the prepreg tape is thick, when the pressure roller 104 drives the pressure seat 203 and the adjusting cylinder 202 to move upward, the adjusting cylinder 202 can drive the linkage block 301 to move upward independently of the follower block 201 by abutting and squeezing the trigger rod 3013, thus stretching the positioning tension spring 3011. The linkage block 301 is equipped with a positioning tension spring 3011 inside, and the positioning tension spring 3011... The two ends of 11 are fixedly connected to the inside of the linkage block 301 and the follower block 201, respectively. The positioning block 302 has a linkage groove 3021 inside, and the linkage block 301 has a linkage rod 3012 on its side. The linkage rod 3012 is inserted into the linkage groove 3021. When the linkage block 301 moves upward independently of the follower block 201, the linkage rod 3012 can drive the positioning block 302 to move through the linkage groove 3021. Since the prepreg tape is thicker at this time, the upward movement distance of the pressure roller 104 will also increase. Thus, when the positioning block 302 moves, it can release the locking relationship between the positioning tooth block 3022 and the straight edge of the positioning tooth groove 1022. After that, under the action of the pre-pressure top spring 2011, the follower block 201 will also move upward. During the process, the preload top spring 2011 lengthens to relieve excess pressure. Under the action of the positioning tension spring 3011, as the follower block 201 moves upward, the linkage block 301 moves downward and resets inside the follower block 201, simultaneously driving the positioning block 302 to move in the opposite direction and reset. That is, the teeth of the positioning tooth block 3022 engage with the tooth groove of the second sequential positioning tooth groove 1022, achieving the pressure relief and repositioning operation of the pressure auxiliary component. The pressure auxiliary component can repeat the above actions according to the thickness of the preloaded tape until it is positioned in a suitable position, ensuring that the preload top spring 2011 is always at a suitable extension length, thus keeping the processing pressure within a suitable range. No manual adjustment is required, making it flexible and convenient to use. Furthermore, after the prepreg tape is processed...After the prepreg belt exits between the heating roller 103 and the pressure roller 104, the pressure auxiliary component automatically moves down and resets under its own weight, ready for the next processing, demonstrating a high degree of automation.

[0034] In this embodiment, the positioning column 102 is provided with a track groove 1021 inside, and both the follower block 201 and the pressure seat 203 are provided with track blocks 2031 inside. The track blocks 2031 are inserted into the track groove 1021. This design can limit the movement trajectory of the follower block 201 and the pressure seat 203, and prevent them from tilting or twisting during movement, which could cause the device to jam and fail, thus ensuring stable use.

[0035] The specific usage and function of this embodiment: In the hot pressing process of the prepreg tape, the prepreg tape to be processed is installed on the unwinding device for unwinding. After unwinding, the prepreg tape passes through the heating roller 103 and the pressure roller 104 and is then wound again onto the winding device. When the prepreg tape passes through the heating roller 103 and the pressure roller 104, the heating roller 103 can heat the prepreg tape, and the pressure roller 104 can obtain pressure through the pressure auxiliary component and apply pressure to the prepreg tape, thereby realizing the hot pressing operation. When the prepreg tape passes between the heating roller 103 and the pressure roller 104, the tape body is subjected to squeezing and resistance. The pressure roller 104 moves upward. Due to the locking action of the positioning tooth block 3022 and the straight edge of the positioning tooth groove 1022, the follower block 201 cannot move upward. Therefore, when the pressure roller 104 moves upward, it can only drive the pressure seat 203 and the adjusting cylinder 202 to move upward. When the pressure seat 203 moves upward, it can compress the pre-pressure top spring 2011, so the pressure roller 104 can obtain processing pressure. The pre-pressure top spring 2011 is in a pre-compressed state, so the pressure of the pre-pressure top spring 2011 during deformation does not start from zero. This provides sufficient pressure for hot pressing of the prepreg tape. The pressure auxiliary component can automatically adapt to the thickness of the prepreg tape and change its position, thus enabling processing of prepreg tapes of any thickness. During processing, the pressure auxiliary component can always apply constant pressure to the prepreg tape through the pressure roller 104 without manual adjustment. When the prepreg tape is thin, the upward stroke of the pressure roller 104 is insufficient to move the positioning block 302 a sufficient distance to release the engagement between the positioning tooth block 3022 and the straight edge of the positioning tooth groove 1022. Therefore, the pressure auxiliary component will not change its position and will keep the pressure within a suitable range. When the prepreg tape is thick, when the pressure roller 104 moves the pressure seat 203 and the adjusting cylinder 202 upward, the adjusting cylinder 202 can move the linkage block 301 independently of the follower block 201 and stretch the positioning tension spring 3011 by abutting and squeezing the trigger rod 3013. When block 301 moves upward independently of follower block 201, linkage rod 3012 can drive positioning block 302 to move through linkage groove 3021. Since the prepreg tape is thicker at this time, the upward movement distance of pressure roller 104 will also increase. Thus, when positioning block 302 moves, it can release the engagement relationship between positioning tooth block 3022 and the straight edge of positioning tooth groove 1022. Subsequently, under the action of preload top spring 2011, follower block 201 will also move upward. During the upward movement of follower block 201, preload top spring 2011 will lengthen to relieve excess pressure. Under the action of positioning tension spring 3011, as follower block 201 moves upward, linkage block 301 will move downward and reset inside follower block 201, and drive positioning block 302 to move and reset synchronously in the opposite direction.That is, the teeth of the positioning tooth block 3022 will engage with the tooth groove of the second positioning tooth groove 1022 in sequence, realizing the operation of unloading the pressure auxiliary component and repositioning it. The pressure auxiliary component can repeat the above action according to the thickness of the pre-tensioned belt until it is positioned in a suitable position, ensuring that the pre-pressure top spring 2011 is always in a suitable extension length, so that the processing pressure is always within a suitable range, without the need for manual adjustment, making it flexible and convenient to use. After the pre-impregnated belt is processed, after the pre-impregnated belt comes out between the heating roller 103 and the pressure roller 104, the pressure auxiliary component will... Under its own weight, it automatically moves downward and resets for the next processing. The processing pressure provided to the pressure roller 104 by the pressure auxiliary component can be changed by rotating the adjusting cylinder 202. When the adjusting cylinder 202 is rotated, it drives the pressure seat 203 to move axially along the positioning column 102 via a thread, thereby changing the working distance between the pressure seat 203 and the follower block 201, that is, changing the initial extension length of the preload top spring 2011. This changes the initial pressure value obtained by the pressure roller 104 through the pressure auxiliary component when it moves upward, enabling it to adapt to the processing of prepreg tapes of different specifications.

[0036] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0037] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0038] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A prepreg hot press processing apparatus with an auxiliary structure, comprising: The utility model provides a hot pressing assembly (1), the hot pressing assembly (1) includes base (101), locating stand (102), heating roller (103) and pressure roller (104), locating stand (102) fixed mounting at the top of base (101), and heating roller (103) rotationally connected in the side of locating stand (102), characterized by further including pressure auxiliary assembly, pressure auxiliary assembly is composed of pressure mechanism (2) and positioning mechanism (3), The pressure mechanism (2) includes a follower block (201), an adjusting cylinder (202), and a pressure seat (203), the follower block (201) is inserted outside the locating stand (102), and the adjusting cylinder (202) is inserted outside the follower block (201), the pressure seat (203) is inserted at the bottom of the adjusting cylinder (202), and the pressure roller (104) is rotationally connected on the side of the pressure seat (203); the positioning mechanism (3) includes a linkage block (301) and a positioning block (302), the linkage block (301) is axially inserted inside the follower block (201), and the positioning block (302) is radially inserted inside the follower block (201), the positioning mechanism (3) is provided with two groups inside the follower block (201), and the two groups of positioning mechanisms (3) are symmetrical to each other.

2. The apparatus for hot pressing of a prepreg tape having an auxiliary structure according to claim 1, wherein: The bottom of the adjusting cylinder (202) is provided with threads, and the adjusting cylinder (202) is screwed on the top of the pressure seat (203), the pressure auxiliary assembly is provided with two groups, and the two groups of pressure auxiliary assemblies are symmetrical to each other.

3. The apparatus for hot pressing of a prepreg tape having an auxiliary structure according to claim 2, wherein: The bottom of the follower block (201) is provided with a pre-pressing top spring (2011), and the two ends of the pre-pressing top spring (2011) are respectively abutted against the bottom of the follower block (201) and the inside of the pressure seat (203).

4. The apparatus for hot pressing of a prepreg tape having an auxiliary structure according to claim 3, wherein: The top of the adjusting cylinder (202) is provided with a limiting ring (2021), and the inner diameter of the limiting ring (2021) is greater than the outer diameter of the pressure seat (203).

5. The apparatus for hot pressing of a prepreg tape having an auxiliary structure according to claim 4, wherein: The inside of the linkage block (301) is provided with a positioning tension spring (3011), and the two ends of the positioning tension spring (3011) are respectively fixedly connected to the inside of the linkage block (301) and the inside of the follower block (201).

6. The apparatus for hot pressing of a prepreg tape having an auxiliary structure according to claim 5, wherein: The inside of the positioning block (302) is provided with a linkage groove (3021), and the side of the linkage block (301) is provided with a linkage rod (3012), which is inserted into the inside of the linkage groove (3021).

7. The apparatus for hot pressing of a prepreg tape having an auxiliary structure according to claim 6, wherein: The inside of the locating stand (102) is provided with a track groove (1021), and the inside of the follower block (201) and the pressure seat (203) is provided with a track block (2031), which is inserted into the inside of the track groove (1021).

8. The apparatus for hot pressing of a prepreg tape having an auxiliary structure according to claim 7, wherein: The side of the positioning block (302) is provided with a positioning tooth block (3022), and the inside of the locating stand (102) is provided with a positioning tooth groove (1022), the cross section shape of the single tooth of the positioning tooth block (3022) and the single tooth groove of the positioning tooth groove (1022) is all right triangle, and when the positioning block (302) moves upward, the straight edge of the tooth of the positioning tooth block (3022) and the straight edge of the tooth groove of the positioning tooth groove (1022) are mutually clamped.

9. The apparatus for hot pressing of a prepreg tape having an auxiliary structure according to claim 8, wherein: The top of the linkage block (301) is provided with a trigger lever (3013) arranged radially along the adjusting cylinder (202), and the trigger lever (3013) abuts against the top of the cylinder body of the adjusting cylinder (202).

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