CN217321664U

CN217321664U - Mine rail bulk cement tank truck with quick unloading mechanism

Info

Publication number: CN217321664U
Application number: CN202220773165.2U
Authority: CN
Inventors: 周昱勋; 张演洋; 闫志勇; 张顺安; 吴剑雄; 张水才
Original assignee: Kunming Gaojin Jinma Electromechanical Equipment Co ltd
Current assignee: Kunming Gaojin Jinma Electromechanical Equipment Co ltd
Priority date: 2022-04-02
Filing date: 2022-04-02
Publication date: 2022-08-30
Anticipated expiration: 2032-04-02

Abstract

The application provides a mining rail bulk cement tank car with quick unloading mechanism belongs to cement tank car technical field. The mining rail bulk cement tank truck with the rapid blanking mechanism comprises a tank body component and a blanking component. The tank body component comprises a tank shell and a plurality of supporting strips, wherein the bottom of the tank shell is open and a drawing rail is arranged on the side wall of the tank shell. The unloading component includes connection plate, servo motor, ball screw pair, screw nut pair, connecting rod and pull board, connection plate is connected to the tank shell top, servo motor install in connection plate upper end bottom, the vice vertical butt joint of ball screw is to the servo motor output, screw nut pair establishes to the vice outer lane of ball screw, the pull board passes through the pull track extends to in the tank shell, the connecting rod both ends are articulated with screw nut pair and pull board respectively. This application is convenient for realize unloading fast of cement dry powder, reduces the probability of unloading the jam.

Description

Mine rail bulk cement tank truck with quick unloading mechanism

Technical Field

The application relates to the field of cement tank trucks, in particular to a mining rail bulk cement tank truck with a quick discharging mechanism.

Background

Cement is a powdered hydraulic inorganic cementitious material. Water is added and stirred to form slurry which can be hardened in air or water and can firmly bond sand, stone and other materials together. Bulk cement dry powder is typically required to be taken to bulk cement tankers during storage and transportation.

For example: 1. the Chinese patent application No. CN202011486864.0 discloses a bulk cement tank truck with a quick blanking mechanism; 2. the Chinese patent application number is CN201620420884.0, discloses a bulk cement tank truck; 3. chinese patent application No. CN201821399211.7 discloses a bulk cement tank truck with a quick blanking mechanism. The technical scheme relates to cement blanking, for example, a blanking hole is formed in the bottommost part of the tank body, and a material pushing rod capable of pushing materials up and down by external force is arranged in the blanking hole; in the second embodiment, the side edge of the bottom of the tank body is communicated with a discharge pipe, and the screw shaft is driven by external driving force to push cement powder to the outer side of the discharge pipe for discharge; in the third example, the material is pushed by the auger conveyor at the bottom of the tank body.

Although the mode of unloading among the above-mentioned scheme compares directly to rely on in the traditional mode to arrange that the pipeline efficiency of unloading comes fast, also can reduce the cement powder and unload stifled phenomenon of silt, but also can arrange the ejection of compact a bit, can not discharge the material in the jar more fast.

SUMMERY OF THE UTILITY MODEL

In order to make up for the defects, the application provides the mining rail bulk cement tank truck with the quick discharging mechanism, which is favorable for improving the problem of low discharging efficiency of cement powder in the related technology.

The embodiment of the application provides a mining rail bulk cement tank car with a quick blanking mechanism, which comprises a tank body component and a blanking component.

The tank body component comprises a tank shell and a plurality of supporting strips, wherein the bottom of the tank shell is open and is provided with a drawing rail, and the supporting strips are fixed on the inner wall of the tank shell and the top end of the inner wall of the tank shell and are parallel and level with the bottom in the drawing rail in parallel and at equal intervals.

The unloading component includes connection plate, servo motor, ball pair, screw nut pair, connecting rod and pull board, connection plate is connected to the pot shell top, servo motor install in connection plate upper end bottom, the vice vertical butt joint of ball extremely the servo motor output, screw nut pair establishes extremely the vice outer lane of ball, the pull board passes through the pull track extends to in the pot shell, and can with be located in the pot shell the position shutoff more than the pull board, pull board lower surface with support the laminating of slat upper end, the connecting rod both ends respectively with screw nut pair with the pull board is articulated.

In the implementation process, when the tank car moves to the appointed place and needs the unloading, open the vice rotation of servo motor drive ball, indirectly make the connecting rod one end that articulates to the vice outer wall of screw nut remove down, under the unchangeable circumstances of connecting rod length, the corresponding connecting rod other end of being connected with the pull board outer end will stimulate the pull board and move along the pull track towards the tank shell outside, until make the pull board keep away from the one end of connecting rod and take in pull track department, so be convenient for fast will store the cement powder in the tank shell and lift off fast. In conclusion, this application is convenient for realize unloading fast of cement dry powder, reduces the probability of unloading the jam.

In a specific embodiment, a sealing rubber pad A is adhered to the inner wall of the drawing rail, the drawing plate is movably attached to the sealing rubber pad A, a sealing rubber pad B is adhered to the outer wall of the drawing plate, and the sealing rubber pad B is movably attached to the inner wall of the tank shell.

In the above-mentioned realization in-process, sealing rubber pad A passes through the powerful glue and fixes to pull track inner wall, the leakproofness of pull track and pull board linking department can be increased in the design of utilizing sealing rubber pad A, thereby be convenient for reduce the cement powder in the feeding from the probability that pull track and pull board link up the department and outwards creep, sealing rubber pad B passes through the powerful glue and fixes to pull board outer wall, the leakproofness of pull board and tank shell inner wall linking department can be increased in the design of utilizing sealing rubber pad B, thereby be convenient for reduce the probability that the cement powder outwards spills from the gap between pull board and the tank shell at the in-process of storing.

In a specific embodiment, a lug is connected to the outer wall of the tank shell close to the drawing plate, and the bottom end of the ball screw pair is rotatably connected to the lug.

In the implementation process, the bearing is embedded in the convex block, the bottom end of the ball screw pair is designed to be smooth, the inner ring of the bearing and the bottom end of the ball screw pair are designed to be in interference fit, the design that the convex block is matched with the bearing is utilized to provide bearing capacity for the ball screw pair from the bottom, and the probability that the servo motor and the ball screw pair fall down in suspended installation is reduced.

In a particular embodiment, the connector plates are of L-shaped design, with a reinforcing plate attached to the bottom of the connector plates and secured to the top of the outer shell.

In the above-mentioned realization process, the reinforcing plate links up with linkage plate and pot shell, and the design that utilizes the reinforcing plate does benefit to the fastness that increases linkage plate and pot shell linking.

In a specific embodiment, the top of the tank shell is communicated with a feeding channel, and a sealing cover is arranged on the feeding channel.

In the implementation process, the feeding channel is convenient for throwing the cement powder into the tank shell, and the sealing cover is designed to plug the feeding channel, so that the probability that the dust generated by the cement powder cannot spread outwards from the feeding channel in the subsequent discharging process is facilitated.

In a specific embodiment, a counterweight is fixedly connected to a side of the tank shell facing away from the drawing rail.

In the implementation process, the weight of the two outer sides of the tank shell is convenient to balance by the design of the balancing weight, so that the balance effect when the tank shell moves is convenient to increase.

In a specific embodiment, the mining tracked bulk cement tank car with the rapid blanking mechanism further comprises a dust-proof member and two moving members, wherein the dust-proof member is connected to the bottom of the outer wall of the tank shell, and the two moving members are respectively connected to two sides of the dust-proof member and are symmetrically designed about the dust-proof member.

In the implementation process, the discharging place is convenient to cover in the discharging process by combining the tank shell and the dustproof member, so that the probability of dust spreading in the discharging process can be reduced, and the cement tank truck can be conveniently moved by utilizing the design of the movable member.

In a specific embodiment, the dustproof member includes rectangular frame A, a plurality of electric putter, rectangular frame B and ripple rubber cover, rectangular frame A's inner wall laminating is fixed in can outer wall bottom, ripple rubber cover about both ends respectively with rectangular frame A bottom week side with rectangular frame B upper portion week side is fixed, all electric putter's stiff end and expansion end respectively with rectangular frame A bottom with rectangular frame B upper portion is fixed, just rectangular frame B can utilize electric putter's drive power realizes and ground contact.

In the above-mentioned realization process, before unloading, the electric putter who utilizes all synchronous motion drives rectangular frame B and moves down until with ground contact, and ripple rubber cover can cover the periphery at needs unloading point under electric putter's drive effect indirectly this moment, and feedstock channel department is equipped with the closing cap simultaneously, so be convenient for more omnidirectional play dustproof dust fall's effect.

In a specific embodiment, the length and width of the inside of the rectangular frame B are larger than the length and width of the open bottom in the tank shell, and the lower end of the corrugated rubber cover is fixedly connected to the edge of the upper surface of the rectangular frame B close to the inner side.

In the implementation process, the relative position of the rectangular frame B and the corrugated rubber cover is set so that the cement powder is not convenient to accumulate on the upper part of the rectangular frame B during discharging, and the discharging effect is indirectly increased.

In a specific embodiment, the moving members each include an L-shaped plate and a plurality of wheels, two of the L-shaped plates are respectively connected to both sides of the outer wall of the rectangular frame a, and all of the wheels are respectively connected to the bottom ends of the corresponding L-shaped plates.

In the implementation process, the tank car can move conveniently by using the design of the wheel body.

Drawings

In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic structural diagram of a mining railway bulk cement tank car with a rapid blanking mechanism in a storage and transportation state, provided by an embodiment of the application;

FIG. 2 is a schematic structural diagram of a mining railway bulk cement tank car with a rapid blanking mechanism in a discharging state, provided by an embodiment of the application;

FIG. 3 is a schematic diagram of the external structure of FIG. 1 according to an embodiment of the present disclosure;

fig. 4 is a schematic cross-sectional view of a can shell at a pull out rail according to an embodiment of the present application;

FIG. 5 is an enlarged view of a portion of FIG. 1 at A according to an embodiment of the present disclosure;

fig. 6 is a partial enlarged view of a portion B in fig. 4 according to an embodiment of the present disclosure.

In the figure: 10-a can body member; 110-a can shell; 111-a pull track; 120-brace bar plate; 20-a blanking member; 210-connector tiles; 220-a servo motor; 230-ball screw pair; 240-screw nut pair; 250-a connecting rod; 260-a drawing plate; 30-a dust-proof member; 310-rectangular frame a; 320-electric push rod; 330-rectangular frame B; 340-a corrugated rubber cover; 40-a moving member; a 410-L shaped plate; 420-wheel body.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

Referring to fig. 1 and 2, the present application provides a mining railway bulk cement tank car with a quick blanking mechanism, which comprises a tank member 10 and a blanking member 20.

Wherein, the tank body component 10 is convenient for storing and transporting cement powder; the blanking component 20 is convenient for unloading the cement powder stored in the tank component 10, greatly shortens the cement powder unloading time and reduces the clogging phenomenon when the cement powder is unloaded.

Referring to fig. 1, 2, 3, 4 and 6, the can body member 10 includes a can shell 110 and a plurality of brace bars 120, in this application, the can shell 110 is rectangular. The bottom of the tank shell 110 is opened to have the pull track 111 for opening the design and its lateral wall, all brace slats 120 are fixed in tank shell 110 inner wall and its top and pull track 111 inner bottom looks parallel and level side by side equidistance, specifically, brace slat 120 and tank shell 110 can choose to adopt welding or the mode of fix with screw to be connected, utilize brace slat 120 can reduce the phenomenon that the pull board 260 buckles because the bearing capacity is overweight, brace slat 120 cross-section is the design of triangle-shaped to reduce the probability that brace slat 120 stopped the material in the process of unloading.

In this embodiment, the top of the tank shell 110 is communicated with a feeding channel, and a sealing cover is arranged on the feeding channel. The feeding channel is convenient for putting cement powder into the tank shell 110, and the sealing cover is designed to plug the feeding channel, so that the probability that dust generated by the cement powder cannot spread outwards from the feeding channel in the subsequent discharging process is facilitated.

In this embodiment, a counterweight is fixedly connected to a surface of the shell 110 facing away from the drawing rail 111. The weight of the two outer sides of the tank shell 110 is convenient to balance by the design of the balancing weight, so that the balancing effect when the tank shell 110 moves is convenient to increase, and meanwhile, the weight of the balancing weight can be selected according to the weight of the other side of the tank shell 110, which is not described in detail.

Referring to fig. 1, 2, 3, 4, 5 and 6, the blanking member 20 includes a connection plate 210, a servo motor 220, a ball screw assembly 230, a screw nut assembly 240, a connection rod 250 and a drawing plate 260, the connection plate 210 is connected to the top end of the tank shell 110, the servo motor 220 is installed at the bottom of the upper end of the connection plate 210, the ball screw assembly 230 is vertically butted with the output end of the servo motor 220 through a coupler, the screw nut assembly 240 is arranged on the outer ring of the ball screw assembly 230, the drawing plate 260 extends into the tank shell 110 through a drawing rail 111 and can seal the part of the tank shell 110 above the drawing plate 260, the lower surface of the drawing plate 260 is attached to the upper end of the support slat 120, and two ends of the connection rod 250 are respectively hinged to the screw nut assembly 240 and the drawing plate 260.

It should be further noted that the design of the drawing track 111 is equivalent to a track for moving the drawing plate 260, and also belongs to a track on the tank car, and the drawing track 111 can be used for assisting the drawing plate 260 to seal the inner space of the tank shell 110, so as to facilitate the storage of cement powder and the subsequent discharge of cement powder.

In this embodiment, a sealing rubber pad a is adhered to the inner wall of the pull rail 111, the pull plate 260 is movably attached to the sealing rubber pad a, a sealing rubber pad B is adhered to the outer wall of the pull plate 260, and the sealing rubber pad B is movably attached to the inner wall of the tank shell 110. 4-6, the sealing rubber pad A is fixed to the inner wall of the drawing rail 111 through strong glue, the sealing performance of the joint of the drawing rail 111 and the drawing plate 260 can be improved by the design of the sealing rubber pad A, so that the probability that cement powder spreads outwards from the joint of the drawing rail 111 and the drawing plate 260 in the feeding process is reduced, the sealing rubber pad B is fixed to the outer wall of the drawing plate 260 through strong glue, the sealing performance of the joint of the drawing plate 260 and the inner wall of the tank shell 110 can be improved by the design of the sealing rubber pad B, and the probability that the cement powder leaks outwards from the gap between the drawing plate 260 and the tank shell 110 in the storage process is reduced.

In this embodiment, a protrusion is connected to the outer wall of the shell 110 near the drawing plate 260, and the bottom end of the ball screw assembly 230 is rotatably connected to the protrusion. The bearing is embedded in the convex block, the bottom end of the ball screw pair 230 is designed to be smooth, the inner ring of the bearing and the bottom end of the ball screw pair 230 are designed to be in interference fit, the design that the convex block is matched with the bearing is convenient for providing bearing force for the ball screw pair 230 from the bottom, and the probability that the servo motor 220 and the ball screw pair 230 fall under suspension installation is reduced.

In this embodiment, the connector tiles 210 are L-shaped, and the bottom of the connector tiles 210 are connected to a reinforcing plate by screws, and the bottom of the reinforcing plate is fixed to the top of the tank shell 110. Wherein the reinforcing plate is engaged with the engaging plate 210 and the can shell 110, and the design of the reinforcing plate is beneficial to increase the firmness of the engagement between the engaging plate 210 and the can shell 110.

Referring to fig. 1, 2 and 3, the mining railway bulk cement tank car with the rapid blanking mechanism further comprises a dust-proof member 30 and two moving members 40, wherein the dust-proof member 30 is connected to the bottom of the outer wall of the tank shell 110, and the two moving members 40 are respectively connected to two sides of the dust-proof member 30 and are symmetrically designed about the dust-proof member 30. The combination of the tank shell 110 and the dustproof member 30 facilitates covering the unloading place during unloading, thereby reducing the probability of dust spreading during unloading, and facilitating the movement of the cement tank truck by utilizing the design of the movable member 40.

The dust-proof member 30 includes a rectangular frame a310, a plurality of electric push rods 320, a rectangular frame B330 and a corrugated rubber cover 340, the inner wall of the rectangular frame a310 is attached and fixed to the bottom of the outer wall of the tank shell 110, the upper and lower ends of the corrugated rubber cover 340 are fixed to the bottom circumference of the rectangular frame a310 and the upper circumference of the rectangular frame B330 by screws, the fixed ends and the movable ends of all the electric push rods 320 are fixed to the bottom of the rectangular frame a310 and the upper portion of the rectangular frame B330 by screws, and the rectangular frame B330 can be in contact with the ground by the driving force of the electric push rods 320. Before unloading, the electric push rod 320 which utilizes all synchronous motions drives the rectangular frame B330 to move downwards until contacting with the ground, at the moment, the corrugated rubber cover 340 indirectly covers the periphery of a discharging point required under the driving action of the electric push rod 320, and meanwhile, the feeding channel is provided with a sealing cover, so that the dustproof and dust-settling effects can be more comprehensively achieved.

The length and width of the inside of the rectangular frame B330 are larger than the length and width of the open bottom of the tank shell 110, and the lower end of the corrugated rubber cover 340 is fixedly connected to the edge of the upper surface of the rectangular frame B330 near the inner side. The relative positions of the rectangular frame B330 and the corrugated rubber cover 340 are set so that cement powder is not convenient to accumulate on the upper part of the rectangular frame B330 during discharging, and the discharging effect is indirectly increased.

The moving members 40 each include an L-shaped plate 410 and a plurality of wheels 420, the two L-shaped plates 410 are respectively connected to both sides of the outer wall of the rectangular frame a310, and all the wheels 420 are respectively connected to the bottom ends of the corresponding L-shaped plates 410 by screws. Wherein the design of the wheel body 420 is utilized to facilitate the movement of the tank car.

The mining rail bulk cement tank truck with the rapid discharging mechanism has the working principle that:

screwing off the sealing cover to put cement powder into the tank shell 110 from the feeding channel for storage and transportation, wherein the cement powder falling into the tank shell 110 falls and is accumulated on the upper part of the drawing plate 260, when the tank car moves to a specified place and needs to be discharged, the servo motor 220 is started to drive the ball screw pair 230 to rotate, one end of the connecting rod 250 hinged to the outer wall of the screw nut pair 240 is indirectly made to move downwards, under the condition that the length of the connecting rod 250 is not changed, the other end of the connecting rod 250 correspondingly connected with the outer end of the drawing plate 260 pulls the drawing plate 260 to move towards the outer side of the tank shell 110 along the drawing track 111 until one end of the drawing plate 260 far away from the connecting rod 250 is lapped at the drawing track 111, specifically referring to the attached figure 2 in the specification, and therefore, the cement powder stored in the tank shell 110 can be quickly and conveniently unloaded.

Before unloading, the electric push rod 320 utilizing all synchronous motions drives the rectangular frame B330 to move downwards until contacting with the ground, at the moment, the corrugated rubber cover 340 can indirectly cover the periphery of a discharging point required under the driving action of the electric push rod 320, meanwhile, the feeding channel is provided with a sealing cover, so that the dustproof and dust-falling effects can be more comprehensively played, the probability of dust spreading outwards when cement powder is unloaded is reduced, and the electric push rod 320 is used for driving the rectangular frame B330 to recover the original position after the dust falls.

It should be noted that the specific model specifications of the servo motor 220, the electric push rod 320, the corrugated rubber cover 340 and the wheel body 420 need to be determined according to the actual specification of the device, and the specific model selection calculation method adopts the prior art, so detailed description is omitted.

The power supply of the servo motor 220 and the power push rod 320 and the principle thereof will be apparent to those skilled in the art and will not be described in detail herein.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A mining rail bulk cement tank car with a quick blanking mechanism is characterized by comprising

The tank body member (10) comprises a tank shell (110) and a plurality of supporting strips (120), wherein the bottom of the tank shell (110) is open and the side walls of the tank shell are communicated with a drawing rail (111), all the supporting strips (120) are fixed on the inner wall of the tank shell (110) side by side at equal intervals, and the top ends of the supporting strips are flush with the bottom of the drawing rail (111);

the blanking component (20), the blanking component (20) comprises a connecting plate (210), a servo motor (220), a ball screw pair (230), a screw nut pair (240), a connecting rod (250) and a drawing plate (260), the connection plate (210) is connected to the top end of the tank shell (110), the servo motor (220) is arranged at the bottom of the upper end of the connection plate (210), the ball screw pair (230) is vertically butted with the output end of the servo motor (220), the screw nut pair (240) is arranged on the outer ring of the ball screw pair (230), the drawing plate (260) extends into the tank shell (110) through the drawing rail (111), and the part above the drawing plate (260) in the tank shell (110) can be sealed, the lower surface of the drawing plate (260) is attached to the upper end of the supporting strip plate (120), two ends of the connecting rod (250) are respectively hinged with the screw-nut pair (240) and the pull plate (260).

2. The mining tracked bulk cement tank car with the rapid blanking mechanism is characterized in that a sealing rubber gasket A is adhered to the inner wall of the drawing rail (111), the drawing plate (260) is movably attached to the sealing rubber gasket A, a sealing rubber gasket B is adhered to the outer wall of the drawing plate (260), and the sealing rubber gasket B is movably attached to the inner wall of the tank shell (110).

3. The mining tracked bulk cement tank car with the quick discharging mechanism is characterized in that a lug is connected to the outer wall of the tank shell (110) close to the drawing plate (260), and the bottom end of the ball screw pair (230) is rotatably connected to the lug.

4. The mining tracked bulk cement tanker with fast unloading mechanism according to claim 1, characterized in that the connector plate (210) is of L-shaped design, a reinforcement plate is attached to the bottom of the connector plate (210) and the reinforcement plate bottom is fixed to the outer top of the tank shell (110).

5. The mining railway bulk cement tank car with the rapid blanking mechanism as claimed in claim 1, characterized in that the top of the tank shell (110) is communicated with a feeding channel, and a sealing cover is arranged on the feeding channel.

6. The mining railcar with rapid blanking mechanism, according to claim 1, characterized in that a counterweight is fixedly connected to the side of said tank shell (110) facing away from said drawing track (111).

7. The mining railcar with rapid blanking mechanism, according to claim 1, further comprising a dust-proof member (30) and two moving members (40), said dust-proof member (30) being connected to the bottom of the outer wall of said tank shell (110), said two moving members (40) being respectively connected to both sides of said dust-proof member (30) and symmetrically designed about it.

8. The mining tracked bulk cement tank car with the rapid blanking mechanism according to claim 7, wherein the dustproof member (30) comprises a rectangular frame A (310), a plurality of electric push rods (320), a rectangular frame B (330) and a corrugated rubber cover (340), the inner wall of the rectangular frame A (310) is attached and fixed to the bottom of the outer wall of the tank shell (110), the upper end and the lower end of the corrugated rubber cover (340) are respectively fixed to the peripheral side of the bottom of the rectangular frame A (310) and the peripheral side of the upper part of the rectangular frame B (330), the fixed ends and the movable ends of all the electric push rods (320) are respectively fixed to the bottom of the rectangular frame A (310) and the upper part of the rectangular frame B (330), and the rectangular frame B (330) can be in contact with the ground by utilizing the driving force of the electric push rods (320).

9. The mining railcar with rapid blanking mechanism according to claim 8, characterized in that the length and width of the inside of the rectangular frame B (330) is larger than the length and width of the open bottom inside the tank shell (110), and the lower end of the corrugated rubber cover (340) is fixedly connected to the edge of the upper surface of the rectangular frame B (330) close to the inside.

10. The mining railcar with the rapid blanking mechanism, according to claim 9, characterized in that said moving members (40) each comprise an L-shaped plate (410) and a plurality of wheels (420), two of said L-shaped plates (410) are respectively connected to both sides of the outer wall of said rectangular frame a (310), and all of said wheels (420) are respectively connected to the bottom ends of the corresponding L-shaped plates (410).