Rapid cooling demolding device for casting of elevator traction sheave

Abstract

The rapid cooling demolding device comprises a mold base, a hydraulic cylinder is fixedly erected at the upper end of the mold base, an upper mold is arranged at the lower end of a piston rod of the hydraulic cylinder, and a mold groove is formed in the upper end of the mold base. Cold water is guided into the annular cooling cavity through the circulating cold guide pipe, so that the annular cooling cavity provides heat exchange cooling for a casting in the mold cavity, heat in the annular cooling cavity is guided into the U-shaped ventilation grooves through the cold guide pieces, and the motor drives the fan blades to rotate to be matched with the U-shaped ventilation grooves and the ventilation openings to dissipate heat of the cold guide pieces; the air cylinder is matched with the lifting seat to drive the cylindrical jacking bulges which are distributed in a cross shape to jack the formed casting in the mold groove, so that the formed casting in the mold groove can be conveniently and quickly taken out; and a plurality of hydraulic buffers are matched with the rectangular pile to provide buffer protection for the die holder under the limiting action of the movable plate and the rectangular open groove, so that the die holder is prevented from being damaged in the casting process, and the service life of the die holder is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of traction wheel casting molds, in particular to a rapid cooling and demoulding device for elevator traction wheel casting. Background Art

[0002] The elevator traction sheave is the rope sheave on the traction machine and is the device for transmitting traction power of the elevator. The elevator traction sheave transmits power by the friction between the traction wire rope and the rope groove on the traction wheel rim. The overall traction sheave is divided into a wheel drum and an outer wheel rim. The outer wheel rim is fitted with the inner wheel drum and connected with hinged bolts. The wheel drum and outer wheel rim of the traction sheave are both made by die-casting using a casting mold.

[0003] In actual use, the existing traction wheel casting mold is not convenient for quickly cooling and demolding the molding mold, and the casting lower mold lacks a buffer structure and is easily damaged during the casting process, affecting the service life of the casting mold. A rapid cooling and demolding device for elevator traction wheel casting is proposed to solve the above problems. Summary of the invention

[0004] In view of the deficiencies and defects in the prior art, the present invention proposes a rapid cooling and demolding device for elevator traction wheel casting, which is used to solve the technical problems that the existing traction wheel casting mold in the background technology is not convenient for quickly cooling and demolding the molding mold during actual use, and the casting lower mold lacks a buffer structure and is easily damaged during the casting process, thereby affecting the service life of the casting mold.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A rapid cooling demolding device for casting an elevator traction wheel comprises a mold base, a hydraulic cylinder is fixedly mounted on the upper end of the mold base, an upper mold is arranged at the lower end of the piston rod of the hydraulic cylinder, a mold groove is arranged at the upper end of the mold base, a lower mold is arranged in the mold groove, heat dissipation and cooling mechanisms are arranged on the left and right side walls of the mold base, a fixed platform is arranged directly below the mold base, a first groove is arranged at the upper end of the fixed platform, rectangular grooves are arranged on the left and right inner walls of the first groove, the same movable plate is movably inserted in the two rectangular grooves, a clamping mechanism is arranged at the upper end of the movable plate, the clamping mechanism is fixedly connected to the lower end of the mold base, a lifting mechanism is arranged on the bottom of the first groove, and the lifting mechanism is arranged through the bottom of the mold groove.

[0006] Preferably, an annular cooling cavity is provided in the mold base, and a circulating cooling pipe is provided on the front inner wall of the annular cooling cavity near the bottom. A plurality of cooling fins are fixedly provided on the annular inner wall of the annular cooling cavity, and the plurality of cooling fins are distributed at equal intervals, and the plurality of cooling fins are all provided in association with the heat dissipation cooling mechanism.

[0007] Preferably, the heat dissipation cooling mechanism includes U-shaped ventilation grooves respectively arranged on the left and right side walls of the mold base, and two cavities are arranged in the mold base. The two cavities are respectively located in the two U-shaped ventilation grooves, and ventilation holes are arranged on the left and right inner walls of the two cavities. The ventilation holes on the right are connected to the U-shaped ventilation grooves, and motors are fixedly installed on the inner walls of the two cavities close to the inner side. A number of fan blades are fixedly connected to the driving shaft of the motor, and a dustproof net is fixedly installed in the ventilation hole on the left, and a number of cooling plates are arranged to horizontally penetrate the vertical inner wall of the U-shaped ventilation groove.

[0008] Preferably, the clamping mechanism includes positioning blocks fixedly connected to the upper ends of the movable plate near the four corners and rectangular piles fixedly connected to the lower ends of the mold base near the four corners, the upper ends of the four positioning blocks are provided with slots, the four rectangular piles are respectively inserted in the four slots, the inner walls of the four rectangular piles are provided with second grooves, the inner walls of the four second grooves are fixedly connected with springs, the ends of the four springs away from the inner walls of the second grooves are fixedly connected with clamping blocks, the inner walls of the four slots facing the second grooves are provided with through grooves connected inside and outside, and the four clamping blocks are respectively set through the four through grooves.

[0009] Preferably, a plurality of hydraulic buffers are fixedly installed on the bottom of the first groove near the left and right sides, the upper ends of the plurality of hydraulic buffers are fixedly connected to the lower end of the movable plate, the lower ends of the left and right sides of the fixed platform are fixedly connected to support seats, the side walls of the movable plate are in sliding contact with the inner walls of the rectangular groove, a first opening is provided on the bottom at the center position of the first groove, a second opening is provided on the movable plate, and the lifting mechanism is arranged through the first opening and the second opening.

[0010] Preferably, the first opening and the second opening are equal in size and are arranged opposite to each other, and the side wall of the support seat is seamlessly connected to the inner wall of the first opening.

[0011] Preferably, the lifting mechanism includes two cylinders fixedly installed between two support seats, the two cylinders are vertically penetrated through the first opening and the second opening, the upper ends of the two cylinder piston rods are fixedly connected to the same lifting seat, the upper ends of the four sides of the lifting seat located at the center position are provided with cylindrical lifting protrusions, the upper ends of the four cylindrical lifting protrusions are vertically penetrated through the bottom of the mold groove, and the annular side walls of the four cylindrical lifting protrusions close to the upper ends are fixedly connected with sealing rings, and the upper ends of the sealing rings are seamlessly connected to the bottom of the mold groove.

[0012] Preferably, the four columnar lifting protrusions are integrally cast with the lifting seat, the lifting seat and the columnar lifting protrusions are both made of high-temperature resistant alloy products, and the sealing ring is made of high-temperature resistant and corrosion-resistant rubber products.

[0013] Compared with the prior art, the present invention has the following beneficial effects: Cold water is introduced into the annular cooling cavity through a circulating cooling pipe, so that the annular cooling cavity provides heat exchange cooling for the casting in the mold groove, and the heat in the annular cooling cavity is guided into the U-shaped ventilation groove by the cooling fins, so that after the motor drives the fan blades to rotate, the U-shaped ventilation grooves and vents are used to dissipate heat from the cooling fins, which is convenient for rapid cooling and molding of the casting in the mold groove.

[0014] The cylinder cooperates with the lifting seat to drive the cross-shaped columnar lifting protrusions to lift the molded casting in the mold groove, so as to facilitate and quickly take out the molded casting in the mold groove.

[0015] 3. The rectangular pile at the lower end of the die base is inserted into the slot on the movable plate, so that the spring in the second groove drives the clamping block to penetrate the through slot, effectively clamping and positioning the die base on the movable plate, with a simple structure and easy disassembly and replacement.

[0016] 4. Through a number of hydraulic buffers and rectangular piles, the mold base is provided with buffer protection under the limiting effect of the movable plate and the rectangular slot, so as to prevent damage to the mold base during the casting process and extend the service life of the mold base. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A perspective schematic diagram of a rapid cooling and demoulding device for casting an elevator traction sheave proposed by the present invention; Figure 2 for Figure 1 A partial enlarged view of the middle A; Figure 3 This is a schematic diagram of the disassembled structure of a fixed platform and a movable plate of a rapid cooling and demoulding device for elevator traction sheave casting proposed by the present invention; Figure 4 for Figure 1 A partial enlarged view of point B in the middle; Figure 5 This is a schematic diagram of the disassembled structure of a clamping mechanism of a rapid cooling demoulding device for casting an elevator traction sheave proposed by the present invention; Figure 6 The present invention is a schematic structural diagram of a movable plate, a columnar lifting protrusion and a sealing ring of a rapid cooling demoulding device for casting an elevator traction wheel.

[0018] In the figure: 1 mold base, 2 hydraulic cylinder, 3 upper mold, 4 mold groove, 5 lower mold, 6 fixed platform, 7 first groove, 8 rectangular slot, 9 movable plate, 10 annular cooling cavity, 11 circulating cooling pipe, 12 cooling plate, 13 U-shaped ventilation groove, 14 cavity, 15 vent, 16 motor, 17 fan blade, 18 dust net, 19 positioning block, 20 rectangular pile, 21 slot, 22 second groove, 23 spring, 24 block, 25 through groove, 26 hydraulic buffer, 27 support seat, 28 first opening, 29 second opening, 30 cylinder, 31 lifting seat, 32 columnar lifting protrusion, 33 sealing ring. DETAILED DESCRIPTION

[0019] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Reference Figure 1-6 As shown, a rapid cooling demoulding device for elevator traction wheel casting comprises a mold base 1, a hydraulic cylinder 2 is fixedly mounted on the upper end of the mold base 1, an upper mold 3 is arranged at the lower end of the piston rod of the hydraulic cylinder 2, a mold groove 4 is arranged at the upper end of the mold base 1, a lower mold 5 is arranged in the mold groove 4, an annular cooling cavity 10 is arranged in the mold base 1, and a circulating cooling pipe 11 is connected to the inner wall of the front side of the annular cooling cavity 10 near the bottom, and the two circulating cooling pipes 11 are connected to an external refrigerator (not shown in the figure), so that the two circulating cooling pipes 11 cooperate with the external refrigerator (not shown in the figure) to circulate cold water into the annular cooling cavity 10, a plurality of cooling fins 12 are fixedly penetrated on the annular inner wall of the annular cooling cavity 10, and the plurality of cooling fins 12 are evenly spaced and distributed, and the plurality of cooling fins 12 are associated with the heat dissipation cooling mechanism, the annular cooling cavity 10 provides heat exchange cooling for the casting in the mold groove 4, and the heat in the annular cooling cavity 10 is guided to the U-shaped ventilation groove 13 by the plurality of cooling fins 12.

[0022] The left and right side walls of the mold base 1 are both provided with heat dissipation cooling mechanisms, which include U-shaped ventilation grooves 13 respectively arranged on the left and right side walls of the mold base 1. Two cavities 14 are arranged in the mold base 1, and the two cavities 14 are respectively located in the two U-shaped ventilation grooves 13. Ventilation holes 15 are arranged on the inner walls of the left and right sides of the two cavities 14, and the right vent 15 is connected to the U-shaped ventilation groove 13. A motor 16 is fixedly installed on the inner wall of the two cavities 14 close to the inner side, and a plurality of fan blades 17 are fixedly connected to the driving shaft of the motor 16. A dustproof net 18 is fixedly installed in the left vent 15. A plurality of cooling plates 12 are horizontally arranged to penetrate the vertical section inner wall of the U-shaped ventilation groove 13. After the motor 16 is started to drive the plurality of fan blades 17 to rotate, the ventilation holes 15 are cooperated to accelerate the gas circulation in the U-shaped ventilation groove 13, so that the accelerated airflow in the U-shaped ventilation groove 13 quickly dissipates the heat of the plurality of cooling plates 12, which is convenient for the rapid cooling and molding of the casting in the mold groove 4.

[0023] A fixed platform 6 is provided directly below the mold base 1, and a first groove 7 is provided at the upper end of the fixed platform 6. Rectangular grooves 8 are provided on the inner walls on the left and right sides of the first groove 7. The same movable plate 9 is movably inserted in the two rectangular grooves 8. A clamping mechanism is provided at the upper end of the movable plate 9. The clamping mechanism is fixedly connected to the lower end of the mold base 1. The clamping mechanism includes positioning blocks 19 respectively fixedly connected to the upper ends of the movable plate 9 near the four corners and rectangular piles 20 fixedly connected to the lower ends of the mold base 1 near the four corners. A slot 21 is provided at the upper ends of the four positioning blocks 19. The four rectangular piles 20 are respectively inserted in the four slots 21. The inner walls of the four rectangular piles 20 located in the slots 21 are provided with second grooves 22. The inner walls of the four second grooves 22 are fixedly connected with springs 23. The ends of the four springs 23 away from the inner walls of the second grooves 22 are fixedly connected with clamping blocks. 24, the four slots 21 are directly opposite to the inner wall of the second groove 22, and the through grooves 25 connected inside and outside are provided. The four card blocks 24 are respectively set through the four through grooves 25, and the four rectangular piles 20 at the lower end of the mold base 1 are connected with the four positioning blocks 19 on the movable plate 9, so that the four rectangular piles 20 are respectively inserted into the slots 21 on the four positioning blocks 19, and a number of card blocks 24 are pressed to shrink into the second groove 22 and compress the spring 23 until the four rectangular piles 20 are completely inserted into the slot 21. The compressed spring 23 elastically resets and drives the card blocks 24 to penetrate the through grooves 25, effectively positioning the mold base 1 on the movable plate 9 with the rectangular piles 20 and the positioning blocks 19. When disassembling, it is only necessary to press the card blocks 24 to separate from the through grooves 25, and pull the mold base 1 to separate the rectangular piles 20 from the positioning blocks 19. The structure is simple and easy to disassemble and replace.

[0024] A plurality of hydraulic buffers 26 are fixedly installed on the bottom of the first groove 7 near the left and right sides, and the upper ends of the plurality of hydraulic buffers 26 are fixedly connected to the lower end of the movable plate 9, and the lower ends of the left and right sides of the fixed platform 6 are fixedly connected to support seats 27, and the side walls of the movable plate 9 are in sliding contact with the inner wall of the rectangular slot 8. A first opening 28 is provided on the bottom of the center position of the first groove 7, and a second opening 29 is provided on the movable plate 9. The jacking mechanism is arranged through the first opening 28 and the second opening 29. The first opening 28 and the second opening 29 are equal in size and are arranged opposite to each other. The side walls of the support seat 27 are seamlessly connected to the inner wall of the first opening 28, and the plurality of hydraulic buffers 26 cooperate with the rectangular piles 20 to provide buffering protection for the mold base 1 under the limiting action of the movable plate 9 and the rectangular slot 8, so as to prevent damage to the mold base 1 during the casting process and extend the service life of the mold base 1.

[0025] A lifting mechanism is provided at the bottom of the first groove 7, and the lifting mechanism is set through the bottom of the mold groove 4. The lifting mechanism includes two cylinders 30 fixedly installed between the two support seats 27. The two cylinders 30 are vertically set through the first opening 28 and the second opening 29. The upper ends of the piston rods of the two cylinders 30 are fixedly connected to the same lifting seat 31. The upper ends of the four sides of the lifting seat 31 located in the center are all provided with cylindrical lifting protrusions 32. The upper ends of the four cylindrical lifting protrusions 32 are all vertically set through the bottom of the mold groove 4. The cylindrical lifting protrusion 32 is located at the lowest position and is on the same horizontal plane as the upper end of the sealing ring 33, and the cylindrical lifting protrusion 32 and the sealing ring 33 are in contact with each other. The annular inner wall of the mold is in sliding sealing contact, and a sealing ring 33 is fixedly connected to the annular side wall near the upper end of the four cylindrical lifting protrusions 32, and the upper end of the sealing ring 33 is seamlessly connected to the bottom of the mold groove 4. The four cylindrical lifting protrusions 32 are integrally cast with the lifting seat 31. The lifting seat 31 and the cylindrical lifting protrusions 32 are both high-temperature resistant alloy products, and the sealing ring 33 is a high-temperature resistant and corrosion-resistant rubber product. The sealing ring 33 can prevent the raw material in the mold groove 4 from flowing out along the through-hole of the cylindrical lifting protrusion 32. The cylinder 30 cooperates with the lifting seat 31 to drive the cross-shaped cylindrical lifting protrusions 32 to lift the molded casting in the mold groove 4, so as to facilitate the rapid removal of the molded casting in the mold groove 4.

[0026] When the present invention is in use, the four rectangular piles 20 at the lower end of the mold base 1 are docked with the four positioning blocks 19 on the movable plate 9, so that the four rectangular piles 20 are respectively inserted into the slots 21 on the four positioning blocks 19, and a plurality of clamping blocks 24 are pressed to shrink into the second grooves 22 and compress the springs 23 until the four rectangular piles 20 are completely inserted into the slots 21. The compressed springs 23 are elastically reset to drive the clamping blocks 24 to penetrate the through grooves 25, effectively positioning the mold base 1 on the movable plate 9 in conjunction with the rectangular piles 20 and the positioning blocks 19. When disassembling, it is only necessary to press the clamping blocks 24 to separate from the through grooves 25, and pull the mold base 1 to separate the rectangular piles 20 from the positioning blocks 19. The structure is simple and easy to disassemble and replace. The hydraulic cylinder 2 is started to drive the upper mold 3 to dock with the lower mold 5 in the upper mold groove 4 of the mold base 1. A plurality of hydraulic buffers 26 in the first groove 7 cooperate with the rectangular piles 20 to limit the mold base 1 between the movable plate 9 and the rectangular slot 8. The mold base 1 is provided with buffer protection under the action of the position, so as to prevent damage to the mold base 1 during the casting process and extend the service life of the mold base 1. Two circulating cooling pipes 11 cooperate with an external refrigerator (not shown in the figure) to circulate cold water into the annular cooling chamber 10, so that the annular cooling chamber 10 provides heat exchange cooling for the casting in the mold groove 4, and a plurality of cooling fins 12 guide the heat in the annular cooling chamber 10 to the U-shaped ventilation groove 13. After the starting motor 16 drives the plurality of fan blades 17 to rotate, the ventilation port 15 accelerates the gas circulation in the U-shaped ventilation groove 13, so that the accelerated airflow in the U-shaped ventilation groove 13 quickly dissipates the heat of the plurality of cooling fins 12, which is convenient for the rapid cooling and molding of the casting in the mold groove 4. When the casting in the mold groove 4 is cooled and molded, the starting cylinder 30 cooperates with the lifting seat 31 to drive the cross-shaped columnar lifting protrusions 32 to lift the molded casting in the mold groove 4, so as to facilitate the rapid removal of the molded casting in the mold groove 4.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rapid cooling demoulding device for elevator traction wheel casting, comprising a die base (1), a hydraulic cylinder (2) is fixedly mounted on the upper end of the die base (1), an upper die (3) is disposed at the lower end of the piston rod of the hydraulic cylinder (2), a die groove (4) is disposed at the upper end of the die base (1), a lower die (5) is disposed in the die groove (4), and the device is characterized in that: The left and right side walls of the mold base (1) are both provided with heat dissipation cooling mechanisms, a fixed platform (6) is provided directly below the mold base (1), a first groove (7) is provided at the upper end of the fixed platform (6), rectangular slots (8) are provided on the left and right inner walls of the first groove (7), a same movable plate (9) is movably inserted in the two rectangular slots (8), a clamping mechanism is provided at the upper end of the movable plate (9), and the clamping mechanism is fixedly connected to the lower end of the mold base (1), and a lifting mechanism is provided at the bottom of the first groove (7), and the lifting mechanism is arranged to penetrate the bottom of the mold groove (4).

2. A rapid cooling and demoulding device for elevator traction sheave casting according to claim 1, characterized in that: An annular cooling cavity (10) is provided in the mold base (1), and a circulating cooling pipe (11) is provided on the front inner wall of the annular cooling cavity (10) near the bottom, and a plurality of cooling fins (12) are fixedly provided through the annular inner wall of the annular cooling cavity (10), and the plurality of cooling fins (12) are arranged at equal intervals, and the plurality of cooling fins (12) are all arranged in association with a heat dissipation cooling mechanism.

3. A rapid cooling demoulding device for elevator traction sheave casting according to claim 2, characterized in that: The heat dissipation cooling mechanism comprises U-shaped ventilation grooves (13) respectively arranged on the side walls at the left and right ends of the mold base (1); the mold base (1) is provided with two cavities (14), the two cavities (14) are respectively located in the two U-shaped ventilation grooves (13); ventilation holes (15) are arranged on the inner walls on the left and right sides of the two cavities (14); the right ventilation hole (15) is connected to the U-shaped ventilation groove (13); a motor (16) is fixedly installed on the inner wall of the two cavities (14) close to the inner side; a plurality of fan blades (17) are fixedly connected to the driving shaft of the motor (16); a dustproof net (18) is fixedly installed in the left ventilation hole (15); and a plurality of cooling plates (12) are arranged to horizontally penetrate the vertical inner wall of the U-shaped ventilation groove (13).

4. The rapid cooling and demoulding device for elevator traction sheave casting according to claim 1, characterized in that: The clamping mechanism comprises positioning blocks (19) respectively fixedly connected to the upper ends of the movable plate (9) near the four corners and rectangular piles (20) fixedly connected to the lower ends of the mold base (1) near the four corners. The upper ends of the four positioning blocks (19) are each provided with a slot (21). The four rectangular piles (20) are respectively inserted into the four slots (21). The inner walls of the four rectangular piles (20) located in the slots (21) are each provided with a second groove (22). The inner walls of the four second grooves (22) are each fixedly connected with a spring (23). One end of the four springs (23) away from the inner wall of the second groove (22) is fixedly connected with a clamping block (24). The inner walls of the four slots (21) facing the second groove (22) are each provided with a through groove (25) communicating with the inside and outside. The four clamping blocks (24) are respectively arranged to penetrate the four through grooves (25).

5. The rapid cooling and demoulding device for elevator traction sheave casting according to claim 1, characterized in that: A plurality of hydraulic buffers (26) are fixedly mounted on the bottom of the first groove (7) near the left and right sides, the upper ends of the plurality of hydraulic buffers (26) are fixedly connected to the lower end of the movable plate (9), the lower ends of the left and right sides of the fixed platform (6) are fixedly connected to support seats (27), the side walls of the movable plate (9) are in sliding contact with the inner wall of the rectangular slot (8), a first opening (28) is provided on the bottom at the center of the first groove (7), a second opening (29) is provided on the movable plate (9), and the lifting mechanism is arranged to pass through the first opening (28) and the second opening (29).

6. A rapid cooling and demoulding device for elevator traction sheave casting according to claim 5, characterized in that: The first opening (28) and the second opening (29) are of equal size and are arranged opposite to each other, and the side wall of the support seat (27) is seamlessly connected to the inner wall of the first opening (28).

7. The rapid cooling and demoulding device for elevator traction sheave casting according to claim 5, characterized in that: The lifting mechanism comprises two cylinders (30) fixedly mounted between two support seats (27), the two cylinders (30) vertically penetrating the first opening (28) and the second opening (29), the upper ends of the piston rods of the two cylinders (30) fixedly connected to the same lifting seat (31), the upper ends of the four sides of the lifting seat (31) located at the center are provided with columnar lifting protrusions (32), the upper ends of the four columnar lifting protrusions (32) vertically penetrating the bottom of the mold groove (4), the annular side walls of the four columnar lifting protrusions (32) close to the upper ends are fixedly connected with sealing rings (33), and the upper ends of the sealing rings (33) are seamlessly connected to the bottom of the mold groove (4).

8. A rapid cooling and demoulding device for elevator traction sheave casting according to claim 7, characterized in that: The four columnar lifting protrusions (32) are integrally cast with the lifting seat (31); the lifting seat (31) and the columnar lifting protrusions (32) are both made of high-temperature resistant alloy products; and the sealing ring (33) is made of high-temperature resistant and corrosion-resistant rubber products.

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