Die

Abstract

The utility model discloses a mold which comprises a front mold, a rear mold and a plurality of sliding block assemblies, and the front mold is provided with a worm cavity; the rear mold is suitable for abutting against the front mold in the first direction for mold assembly, the rear mold is provided with a bevel gear cavity and an insertion part, and the insertion part communicates with the bevel gear cavity and is suitable for being inserted into a metal shaft; the multiple sliding block assemblies are located between the front mold and the rear mold and connected to the front mold or the rear mold, each sliding block assembly comprises a sliding block insert, the sliding block inserts can move relative to the rear mold, and the multiple sliding block inserts are arranged in the circumferential direction in the first direction and suitable for being defined to form a polish rod cavity; the inner spaces of a plurality of cavities (the worm cavity, the polish rod cavity and the helical gear cavity) are filled with the metal shaft, the situation that the feeding difference between the cavities is too large is avoided, the worm cavity, the polish rod cavity and the helical gear cavity are formed in the same mold, integrated injection molding and rubber coating of the helical gear-worm composite transmission shaft are achieved, and the production efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to casting equipment technical field, especially relates to a mould. BACKGROUND

[0002] The helical gear-worm composite transmission shaft is usually used in complex transmission scenes, and in the prior art, the helical gear-worm composite transmission shaft is usually produced by disassembling parts into a helical gear part, a polished rod part and a worm part, and then combining the parts to form the helical gear-worm composite transmission shaft, so that the production cost is high and the efficiency is low. SUMMARY

[0003] The utility model discloses at least solve one of the prior art technical problems. To this end, the utility model provides a mould, can fill the internal space of multiple chambers (worm chamber, polished rod chamber and helical gear chamber) through the form of the plug-in of the plug-in part, avoid the problem that the feeding difference between chambers is too large, leading to shrinkage cavity, material shortage and other defects of the casting product, so that the use demand cannot be met, to realize the integration of the helical gear-worm composite transmission shaft injection molding.

[0004] In one aspect, the utility model discloses a mould for producing a helical gear-worm composite transmission shaft, the helical gear-worm composite transmission shaft includes a polished rod part, a worm part, a helical gear part and a metal shaft, the polished rod part is connected with the worm part and the helical gear part, the metal shaft penetrates the worm part, the polished rod part and the helical gear part in turn, and the mould comprises:

[0005] A front mould is provided with a worm chamber.

[0006] A rear mould is adapted to abut and press the front mould to close the mould along a first direction, the rear mould is provided with a helical gear chamber and a plug-in part, the plug-in part is communicated with the helical gear chamber and is adapted to be plugged with the metal shaft.

[0007] A plurality of slider assemblies are located between the front mould and the rear mould and are connected to the front mould or the rear mould, the slider assembly comprises a slider insert, the slider insert can move relative to the rear mould, a plurality of slider inserts are arranged around the circumference of the first direction and are adapted to enclose a polished rod chamber.

[0008] According to some embodiments of the utility model, the front mould comprises a front mould frame and a worm insert rotatably connected to the front mould frame, and the worm insert is provided with the worm chamber.

[0009] The rear mould comprises a rear mould frame and a helical gear insert rotatably connected to the rear mould frame, and the helical gear insert is provided with the helical gear chamber.

[0010] According to some embodiments of the utility model, the front mold further includes a driving assembly, the worm insert is suitable for moving along the first direction under the driving of the driving assembly, so as to switch between the avoiding position and the die casting position, the avoiding position is that the worm insert is away from the bevel gear insert, so as to reserve the space for the metal shaft to pass between the worm insert and the bevel gear insert, the die casting position is that the worm insert is close to the bevel gear insert, so that the worm cavity, the light pole cavity and the bevel gear cavity are communicated when the front mold and the rear mold are closed.

[0011] According to some embodiments of the utility model, the driving assembly is suitable for driving the worm insert to rotate.

[0012] The front mold further includes a lead insert, the lead insert is arranged at one end of the worm insert away from the rear mold, the lead insert and the worm insert are connected through a threaded part, and the threaded part extends along the first direction.

[0013] According to some embodiments of the utility model, the driving assembly includes a driving piece and a transmission mechanism, the transmission mechanism includes a first tooth part, the first tooth part is suitable for reciprocating under the driving of the driving piece, and the worm insert is provided with a second tooth part matched with the first tooth part.

[0014] According to some embodiments of the utility model, the driving piece is an oil cylinder, the transmission mechanism includes a rack and a driven gear, the driven gear is rotationally connected to the front mold frame, and the teeth of the driven gear constitute the first tooth part.

[0015] According to some embodiments of the utility model, the rear mold further includes an insert base, the insert base is arranged at one side of the bevel gear insert away from the front mold, and the insert base is provided with the plug-in part.

[0016] According to some embodiments of the utility model, the bevel gear insert is provided with a first groove and a plurality of air holes, the insert base is provided with a first protrusion matched with the first groove, and the space between the bevel gear insert and the insert base is communicated with the outside through the air holes.

[0017] According to some embodiments of the utility model, the rear mold further includes a ejector rod and a plug-in hole, the ejector rod is arranged in the plug-in hole, so as to form the plug-in part in cooperation with the plug-in hole.

[0018] According to some embodiments of the utility model, a guide part is arranged at the hole opening of the plug-in hole, and the guide part gradually extends away from the axis direction of the plug-in hole along the extension direction of the plug-in hole.

[0019] The present invention has at least the following beneficial effects: By inserting the metal shaft into the connector, the metal shaft fills the internal space of multiple cavities (worm cavity, smooth shaft cavity, and helical gear cavity), avoiding the problem of excessive material difference between cavities leading to too many defects such as shrinkage cavities and material shortages in the casting product, which would prevent it from meeting the usage requirements. This lays the foundation for the integrated injection molding of the helical gear-worm composite drive shaft. Furthermore, by setting the worm cavity, smooth shaft cavity, and helical gear cavity in the same mold, the integrated injection molding and overmolding of the helical gear-worm composite drive shaft is realized, effectively improving production efficiency.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is one of the structural schematic diagrams of the mold according to an embodiment of the present utility model;

[0023] Figure 2 This is a second schematic diagram of the mold structure according to an embodiment of the present utility model;

[0024] Figure 3 for Figure 2 A bottom view along the Z-axis;

[0025] Figure 4 For along Figure 3 A sectional view of the center section line AA;

[0026] Figure 5 for Figure 4 A magnified view of part B in the middle;

[0027] Figure 6 This is the third schematic diagram of the mold structure according to an embodiment of the present utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the helical gear-worm gear composite transmission shaft according to an embodiment of the present invention.

[0029] Figure label:

[0030] 100. Front mold; 110. Worm insert; 111. Worm cavity; 112. Second tooth; 120. Front mold base; 130. Drive assembly; 131. Drive component; 132. Transmission mechanism; 1321. First tooth; 1322. Rack; 1323. Driven gear; 140. Lead insert;

[0031] 200, back mold; 210, bevel gear insert; 211, bevel gear cavity; 212, first groove; 213, vent hole; 220, insertion part; 221, ejector rod; 222, insertion hole; 2221, guide part; 230, back mold frame; 240, insert base; 241, first protrusion;

[0032] 300, slider assembly; 310, slider insert; 311, light rod cavity;

[0033] 910, worm part; 920, light rod part; 930, bevel gear part; 940, metal shaft. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0035] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0036] In the description of the present application, the meaning of "several" is one or more, the meaning of "multiple" is two or more, greater than, less than, more than, etc. are understood as not including the number, "above", "below", "within", etc. are understood as including the number. If there is a description of "first", "second", etc. is only used to distinguish technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0037] In the description of the present application, unless otherwise explicitly limited, the words "set", "install", "connect", etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical solution.

[0038] Before explaining the mold of the embodiments of the present application, the product to which the mold of the present application is applied needs to be explained, and the product to which the mold of the present application is applied is explained in combination with Figure 7As shown, the mold of the present application is used to produce a helical gear-worm composite transmission shaft, which comprises a light rod part 920, a worm part 910, a helical gear part 930 and a metal shaft 940, the light rod part 920 connects the worm part 910 and the helical gear part 930, and the metal shaft 940 penetrates the worm part 910, the light rod part 920 and the helical gear part 930 in sequence.

[0039] As shown in Figures 1 to 5 and Figure 7 As shown, in one aspect, the utility model discloses a mold, comprising front mould 100, back mould 200 and a plurality of slider assemblies 300, front mould 100 is equipped with worm cavity 111, back mould 200 is suitable for along with front mould 100 and presss from both sides and closes the mould in the first direction (illustration X), back mould 200 is equipped with helical gear cavity 211 and inserts part 220, and inserts part 220 is communicated helical gear cavity 211, is suitable for with metal shaft 940 and inserts, a plurality of slider assemblies 300 are located between front mould 100 and back mould 200, and are connected to front mould 100 or back mould 200, and slider assembly 300 includes slider insert 310, slider insert 310 can move relative to back mould 200, and a plurality of slider inserts 310 are arranged around the circumference of the first direction, and are suitable for surrounding and forming light rod cavity 311.

[0040] According to the mold of the utility model embodiment, the metal shaft 940 is inserted into the insertion part 220 and fixed in advance, the slider insert 310 of the slider assembly 300 moves to the metal shaft 940 to form the light rod cavity 311, the front mold 100 moves to the back mold 200 to close the mold, so that the worm cavity 111, the light rod cavity 311 and the helical gear cavity 211 are communicated to form an injection cavity, and at the same time, the metal shaft 940 is placed and penetrates the worm cavity 111, the light rod cavity 311 and the helical gear cavity 211 along the first direction, after the mold is closed, the injection cavity is injected with a molding material, the molding material wraps the metal shaft 940, and at the same time, the worm part 910 is formed in the worm cavity 111, the light rod part 920 is formed in the light rod cavity 311, and the helical gear part 930 is formed in the helical gear cavity 211.

[0041] It should be noted that in the related art, for the production of the helical gear-worm composite transmission shaft, considering the different wall thicknesses of each part, in order to ensure the injection effect, the parts are usually disassembled into a helical gear part 930, a light rod part 920 and a worm part 910, etc. and independently cast to form the helical gear-worm composite transmission shaft in combination, which leads to the production of the helical gear-worm composite transmission shaft requiring multiple molds and multiple injection molding machines, and has the problems of high production cost and low efficiency.

[0042] According to the mold of the embodiment of the utility model, through the form that metal shaft 940 is inserted in insertion part 220, metal shaft 940 fills the internal space of multiple chambers (worm chamber 111, light pole chamber 311 and bevel gear chamber 211), avoid the problem that too much feeding difference between the cavity causes the shrinkage of cast product, too much defect such as material deficiency causes the problem that use demand can not be met, lay the foundation for the integration injection molding of bevel gear-worm composite transmission shaft, further, worm chamber 111, light pole chamber 311 and bevel gear chamber 211 are set in the same mold, realize the integration injection molding of bevel gear-worm composite transmission shaft, effectively improve production efficiency.

[0043] In the embodiment, the mold includes two slider assemblies 300 arranged in sequence along the illustrated Y direction, and in other embodiments, a larger number of slider assemblies 300 can also be used.

[0044] In the embodiment, the front mold 100 is provided with two worm chambers 111, and the rear mold 200 is provided with two bevel gear chambers 211, and in other embodiments, the number of worm chambers 111 and bevel gear chambers 211 can be adjusted based on actual needs.

[0045] In the embodiment, the metal shaft 940 inserted in the insertion part 220 can be in the form of manual placement or in the form of carrying by a carrying mechanism.

[0046] In some embodiments, in combination with Figures 3 to 5 As shown, the front mold 100 includes a front mold frame 120 and a worm insert 110 rotatably connected to the front mold frame 120, and the worm insert 110 is provided with a worm chamber 111; the rear mold 200 includes a rear mold frame 230 and a bevel gear insert 210 rotatably connected to the rear mold frame 230, and the bevel gear insert 210 is provided with a bevel gear chamber 211.

[0047] In the embodiment, during the demolding process of the bevel gear-worm composite transmission shaft, the worm insert 110 rotates synchronously when linearly demolding between the worm insert 110 and the worm part 910, so that the stress on the tooth surface of the worm part 910 is reduced, avoiding damage during the demolding process; the bevel gear insert 210 rotates synchronously when linearly demolding between the bevel gear part 930 and the bevel gear insert 210, so that the stress on the tooth surface of the bevel gear part 930 is reduced, avoiding damage during the demolding process.

[0048] In some embodiments, in combination with Figures 2 to 5As shown, the front mold 100 further comprises a driving assembly 130, the worm insert 110 is adapted to move along the first direction (illustrated as X direction) under the driving of the driving assembly 130 to switch between the avoiding position and the pressure casting position, the avoiding position is the position where the worm insert 110 is away from the bevel gear insert 210 to reserve a space for the metal shaft 940 to pass through between the worm insert 110 and the bevel gear insert 210, and the pressure casting position is the position where the worm insert 110 is close to the bevel gear insert 210 to make the worm cavity 111, the light pole cavity 311 and the bevel gear cavity 211 communicate when the front mold 100 and the rear mold 200 are closed.

[0049] In the embodiment, before the metal shaft 940 is inserted into the insertion part 220, the front mold 100 and the rear mold 200 are in a separated state, and the worm insert 110 is in the avoiding position, so that the metal shaft 940 can be inserted into the insertion part 220 fixedly through the space between the front mold 100 and the rear mold 200, after the metal shaft 940 is inserted, the front mold 100 and the rear mold 200 are closed, the worm insert 110 is switched from the avoiding position to the pressure casting position under the driving of the driving assembly 130, the worm cavity 111, the light pole cavity 311 and the bevel gear cavity 211 are communicated, and are ready to receive the injected molding material.

[0050] By setting the movable worm insert 110, the space avoiding of the metal shaft 940 is realized without increasing the relative moving distance of the front mold 100 and the rear mold 200, and the stroke specification required by the injection molding machine on which the mold is installed is effectively reduced.

[0051] In some embodiments, in combination with Figures 3 to 5 As shown, the driving assembly 130 is adapted to drive the worm insert 110 to rotate, and the mold further comprises a lead insert 140, the lead insert 140 is arranged at the end of the worm insert 110 away from the rear mold 200, the lead insert 140 and the worm insert 110 are connected through the thread part, and the thread part extends along the first direction.

[0052] In the embodiment, when the driving assembly 130 drives the worm insert 110 to rotate, the lead insert 140 converts the rotary motion of the worm insert 110 into the linear motion along the first direction through the thread part, that is, the worm insert 110 moves along the first direction while rotating, so that the automation of the worm part 910 of the bevel gear-worm composite transmission shaft being demolded from the worm cavity 111 is realized by the driving assembly 130 driving the worm insert 110 to rotate, the production efficiency is improved, and the tooth surface of the worm part 910 will not be damaged.

[0053] In some embodiments, in combination with Figure 3As shown, the driving assembly 130 comprises a driving member 131 and a transmission mechanism 132, the transmission mechanism 132 comprises a first tooth portion 1321 adapted to reciprocate under the driving of the driving member 131, and the worm insert 110 is provided with a second tooth portion 112 matched with the first tooth portion 1321. The reciprocating movement of the first tooth portion 1321 is transmitted to the worm insert 110 through the second tooth portion 112, so that the worm insert 110 realizes the switching between the avoiding position and the die-casting position.

[0054] In other embodiments, the transmission mechanism 132 can also be in the form of a combination of a rotating part and a moving part, so as to realize the rotation of the worm insert 110 and the movement in the first direction at the same time.

[0055] In some embodiments, in combination with Figure 3 As shown, the driving member 131 is an oil cylinder, and the transmission mechanism 132 comprises a rack 1322 and a driven gear 1323, the driven gear 1323 is rotationally connected to the front mold frame 120, and the teeth of the driven gear 1323 constitute the first tooth portion 1321.

[0056] In this embodiment, the oil cylinder drives the rack 1322 to reciprocate and pull, the reciprocating and pulling of the rack 1322 is converted into the rotating movement of the driven gear 1323, the driven gear 1323 drives the worm insert 110 to rotate, and through the combination of the rack 1322 and the driven gear 1323, a plurality of worm inserts 110 (such as Figure 3 As shown, there can be two) can be arranged around the driven gear 1323, so as to realize the production of a plurality of helical gear-worm composite transmission shafts by a single mold.

[0057] In other embodiments, the driving member 131 can also be a stepping motor, an air cylinder, etc. It can be understood that when a stepping motor is adopted, the transmission mechanism 132 needs to convert the rotating movement of the stepping motor into the rotating movement and the linear movement in the first direction of the worm insert 110, such as a combination of a multi-link and a universal joint.

[0058] In some embodiments, in combination with Figure 5 As shown, the rear mold 200 further comprises an insert base 240, the insert base 240 is arranged on the side of the helical gear insert 210 away from the front mold 100, and the insert base 240 is provided with the plug-in portion 220. In this embodiment, the helical gear cavity 211 on the rear mold 200 and the plug-in portion 220 are split, so that when the helical gear cavity 211 corresponding helical gear insert 210 is worn or the plug-in portion 220 corresponding insert base 240 is worn, they can be replaced individually, thereby reducing the mold maintenance cost.

[0059] In some embodiments, in combination with Figure 5 and Figure 6As shown, the bevel gear insert 210 is provided with a first recess 212 and a plurality of air holes 213, and the insert base 240 is provided with a first protrusion 241 matched with the first recess 212, and the space between the bevel gear insert 210 and the insert base 240 is communicated with the outside through the air holes 213.

[0060] It can be understood that, in the matching process of the first protrusion 241 of the bevel gear insert 210 and the first recess 212 of the insert base 240, the air between the two is squeezed, which causes the bevel gear insert 210 and the insert base 240 to be difficult to assemble and also difficult to disassemble after assembly, and the air tightness between the first protrusion 241 and the first recess 212 is destroyed through the air holes 213, thereby optimizing the disassembly process of the bevel gear insert 210 and the insert base 240.

[0061] In some embodiments, in combination with Figure 5 As shown, the rear mold 200 further comprises a top rod 221 and a plug hole 222, and the top rod 221 is arranged in the plug hole 222 to form a plug-in part 220 in cooperation with the plug hole 222.

[0062] In the embodiment, the top rod 221 is used to push the bevel-worm composite transmission shaft from the rear mold 200, so that the bevel gear part 930 of the bevel-worm composite transmission shaft is separated from the bevel gear cavity 211, and the bevel gear insert 210 connected to the rear mold frame 230 is rotated, so that the linear motion of the top rod 221 pushing the bevel gear part 930 is converted into the rotary motion of the bevel gear insert 210, which effectively prevents the tooth surface of the bevel gear part 930 from being subjected to excessive force, thereby improving the yield rate. Moreover, the plug-in part 220 is formed by the combination of the top rod 221 and the plug hole 222, which ensures the uniform size of the batch of metal shafts 940, and the metal shafts 940 have high strength and are not easy to deform, and the pushing of the metal shafts 940 by the top rod 221 is conducive to reducing the deformation of the bevel-worm composite transmission shaft during demolding.

[0063] In some embodiments, in combination with Figure 5 As shown, the plug hole 222 is provided with a guide part 2221 at the hole opening, and the guide part 2221 gradually extends away from the axis of the plug hole 222 along the extension direction of the plug hole 222. The guide part 2221 plays a guiding role in the insertion process of the metal shaft 940, which facilitates the assembly of the metal shaft 940 and the plug-in part 220.

[0064] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by the ordinary skilled in the art without departing from the purpose of the utility model.

Claims

1. A mold for producing a helical gear-worm composite transmission shaft, the helical gear-worm composite transmission shaft comprising a light pole portion (920), a worm portion (910), a helical gear portion (930), and a metal shaft (940), the light pole portion (920) connecting the worm portion (910) and the helical gear portion (930), the metal shaft (940) sequentially penetrating the worm portion (910), the light pole portion (920), and the helical gear portion (930), characterized in that, The application relates to a die assembly for die casting a metal shaft (940) and a light pole (910) connected to the metal shaft (940), comprising: a front die (100) provided with a worm cavity (111); a rear die (200) adapted to be pressed against the front die (100) along a first direction, the rear die (200) being provided with a bevel gear cavity (211) and a plug-in part (220) communicating with the bevel gear cavity (211) and adapted to be plugged into the metal shaft (940); a plurality of slider assemblies (300) located between the front die (100) and the rear die (200) and connected to the front die (100) or the rear die (200), the slider assemblies (300) comprising slider inserts (310) capable of moving relative to the rear die (200), the slider inserts (310) being arranged around the circumference of the first direction and adapted to enclose a light pole cavity (311).

2. The mold of claim 1, wherein The front die (100) comprises a front die frame (120) and a worm insert (110) rotatably connected to the front die frame (120), the worm insert (110) being provided with the worm cavity (111); The rear die (200) comprises a rear die frame (230) and a bevel gear insert (210) rotatably connected to the rear die frame (230), the bevel gear insert (210) being provided with the bevel gear cavity (211).

3. The mold of claim 2, wherein, The front die (100) further comprises a driving assembly (130), the worm insert (110) is adapted to move along the first direction under the driving of the driving assembly (130) to switch between a avoiding position and a die casting position, the avoiding position is a position where the worm insert (110) is away from the bevel gear insert (210) to reserve a space for the metal shaft (940) to pass between the worm insert (110) and the bevel gear insert (210); the die casting position is a position where the worm insert (110) is close to the bevel gear insert (210) to make the worm cavity (111), the light pole cavity (311) and the bevel gear cavity (211) communicate when the front die (100) and the rear die (200) are pressed together.

4. The mold of claim 3, wherein The driving assembly (130) is adapted to drive the worm insert (110) to rotate; The front die (100) further comprises a lead insert (140) arranged at an end of the worm insert (110) away from the rear die (200), the lead insert (140) and the worm insert (110) are connected through a threaded part, and the threaded part extends along the first direction.

5. The mold of claim 4, wherein, The driving assembly (130) comprises a driving member (131) and a transmission mechanism (132), the transmission mechanism (132) comprises a first tooth part (1321) adapted to reciprocate under the driving of the driving member (131), and the worm insert (110) is provided with a second tooth part (112) matched with the first tooth part (1321).

6. The mold of claim 5, wherein, The driving member (131) is an oil cylinder, the transmission mechanism (132) comprises a rack (1322) and a driven gear (1323), the driven gear (1323) is rotationally connected to the front mold base (120), and the teeth of the driven gear (1323) constitute the first tooth portion (1321).

7. The mold according to any one of claims 2 to 6, characterized in that The rear mold (200) further comprises an insert base (240), the insert base (240) is arranged on a side of the bevel gear insert (210) away from the front mold (100), and the insert base (240) is provided with the plug-in part (220).

8. The mold of claim 7, wherein, The bevel gear insert (210) is provided with a first groove (212) and a plurality of air holes (213), the insert base (240) is provided with a first protrusion (241) matched with the first groove (212), and the space between the bevel gear insert (210) and the insert base (240) is communicated with the outside through the air holes (213).

9. The mold of claim 1, wherein, The rear mold (200) further comprises an ejector rod (221) and a plug-in hole (222), the ejector rod (221) is arranged in the plug-in hole (222) to form the plug-in part (220) in cooperation with the plug-in hole (222).

10. The mold of claim 9, wherein, A guide part (2221) is arranged at the aperture of the plug-in hole (222), and the guide part (2221) gradually extends away from the axis direction of the plug-in hole (222) along the extension direction of the plug-in hole (222).

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