Compact thermal insulation liquid metering weightlessness scale

Abstract

The utility model relates to a compact thermal insulation liquid metering weightlessness scale. Comprising a base, a support arranged on the base, a material supplementing barrel with an interlayer for supplementing materials, a metering barrel with an interlayer for metering the materials, a weighing platform component for weighing the materials, a heat preservation metering pump for conveying the materials and a mold temperature controller installed on the base. The weighing platform component is mounted on the base; the metering barrel with the interlayer is arranged on the weighing platform component; the interlayer supplementing barrel is mounted at the top end of the bracket; the heat-preservation metering pump is installed on one side of the support. The problems that in the prior art, a common heat preservation liquid metering weightlessness scale is too simple in structure and inaccurate in metering; the technical problems that the structure is too complex, too many connecting pieces exist, the number of leakage points is large, and metering is not accurate are solved.

Description

Technical Field

[0001] The utility model relates to the field of metering loss-in-weight scales, in particular to a compact thermal insulation liquid metering loss-in-weight scale. Background Art

[0002] Loss-in-weight scales are used in industries such as chemicals, food, plastics, and water supply to precisely meter and feed specialized liquids at a specific temperature. Existing, commonly used loss-in-weight scales for thermally insulating liquids are either overly simple, resulting in inaccurate measurement, or overly complex, with numerous connections, leaks, and inaccurate measurement. Utility Model Content

[0003] The embodiments of the present application provide a compact loss-in-weight scale for measuring thermal insulation liquids, thereby solving the technical problems in existing technical solutions that the loss-in-weight scales for measuring thermal insulation liquids are either too simple in structure and inaccurate in measurement, or too complex in structure, with too many connecting parts, many leakage points, and inaccurate measurement.

[0004] The technical solutions adopted in the embodiments of this application are as follows:

[0005] A compact heat-insulating liquid metering loss-in-weight scale comprises a base, a bracket mounted on the base, a feeding bucket with a sandwich layer for feeding, a metering bucket with a sandwich layer for metering materials, a weighing platform for weighing materials, a heat-insulating metering pump for conveying materials, and a mold temperature controller mounted on the base; the weighing platform is mounted on the base; the metering bucket with a sandwich layer is mounted on the weighing platform; the feeding bucket with a sandwich layer is mounted on the top of the bracket; and the heat-insulating metering pump is mounted on one side of the bracket.

[0006] The discharge pipe of the interlayer feeding barrel and the feed port of the interlayer metering barrel are connected in sequence through an interlayer pneumatic ball valve, an interlayer flange pipe and a first soft connector; the top pump port of the thermal insulation metering pump is installed with an interlayer tee, a damper and an oil pressure gauge in sequence; a spray gun is installed on one side of the interlayer tee; the bottom pump port of the thermal insulation metering pump is installed with an interlayer lower pipe, a second soft connector, a pump feed flexible elbow and a first Y-type filter in sequence; the pump feed flexible elbow is located in the inner cavity of the interlayer metering barrel; the mold temperature controller is connected to the interlayer feeding barrel and the interlayer tee through a second Y-type filter, a flexible loop hose and a transfer pipe in sequence.

[0007] A further technical solution is: a feeding barrel cover is provided at the opening of the interlayer feeding barrel; the feeding barrel cover is installed at the opening of the interlayer feeding barrel through a clamp; a liquid level gauge is installed on the feeding barrel cover, and the liquid level gauge is located in the inner cavity of the interlayer feeding barrel; a metering barrel cover is provided at the opening of the interlayer metering barrel; the metering barrel cover is installed at the opening of the interlayer metering barrel through a clamp; manual ball valves are provided at the discharge pipe of the interlayer feeding barrel and the discharge pipe of the interlayer metering barrel; thermal insulation clothing is provided on the outside of the interlayer feeding barrel and the interlayer metering barrel; an electric heating rod and a thermocouple are provided at the bottom of the interlayer metering barrel.

[0008] A further technical solution is: the weighing platform components include a weighing platform cover, a protective block, a weighing base, a rubber pad, a weighing sensor, a weighing platform plate and a sensor gasket; the weighing platform cover is installed on the weighing base plate; four groups of the protective blocks arranged in a rectangular array are provided at the connection between the weighing platform cover and the weighing base plate; four groups of the rubber pads arranged in a rectangular array are provided at the bottom of the weighing base plate; each group of the rubber pads is connected to the base; the weighing sensor is installed in the inner cavity of the weighing platform cover, and the bottom end of the weighing sensor is connected to the sensor gasket; the sensor gasket is provided on the base; the weighing platform plate is installed on the top of the weighing platform cover; the interlayer metering barrel is installed on the weighing platform plate.

[0009] A further technical solution is: four groups of Forma casters arranged in a rectangular array are provided at the bottom end of the base.

[0010] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0011] 1. Due to the configuration of the base, bracket, interlayer feeding bucket, interlayer metering bucket, weighing platform, insulated metering pump, and mold temperature controller, when the liquid level gauge reaches a low level alarm, manual feeding begins by injecting liquid into the interlayer feeding bucket through the small nozzle on the feeding bucket lid. When the liquid level gauge reaches a high level, the alarm stops, and the interlayer feeding bucket is now ready for feeding. Because the interlayer metering bucket is fixed on the weighing platform, the load cell senses when the liquid weight in the interlayer metering bucket reaches the set minimum weight, sending a signal to the control unit, which opens the interlayer pneumatic ball valve. Liquid is then added from the interlayer feeding bucket through the interlayer pneumatic ball valve, the interlayer flange pipe, and the first flexible connector until the liquid weight reaches the set maximum weight. The load cell senses this and sends a signal to the control unit, which closes the interlayer pneumatic ball valve, completing the feeding cycle. The control unit simultaneously controls the insulated metering pump to feed downstream equipment such as extruders, mixers, and reactors at a set flow rate and pressure. The pump continuously draws liquid from the interlayer metering barrel, filters it through a first Y-type filter, and pumps it through the pump feed flexible elbow to the insulated metering pump head. The pump then pumps it out through the interlayer tee to the spray gun. This entire process is a dynamic weighing and metering process. Manual ball valves are fixedly installed at the discharge pipes of the interlayer feeding and metering barrels. These valves are used to release the insulation oil from the interlayer and drain the old material when changing materials between the interlayer feeding and metering barrels. The pump feed flexible elbow, the first and second flexible connectors, and the rubber pads are all flexible components, preventing the movement and shaking of upstream and downstream equipment from affecting weighing. The protective block is used to prevent pressure or tension beyond the load cell's range from acting directly on the load cell during transportation. Before transport, the scale base and scale platform should be rigidly connected and fixed with bolts to maximize protection for the load cell. The protective block should be removed during measurement. The mold temperature controller and the interlayer jacket within the device form an insulation circuit. Thermal oil is placed in the interlayer, and the mold temperature controller heats, insulates, and controls the temperature. The insulation jackets for the feed and metering barrels also assist in insulation. The interlayered metering barrel has a refueling port. Thermal oil is placed in the interlayer, and is heated and insulated by electric heating rods. The temperature is sensed by thermocouples and fed back to the control unit, which maintains the insulation temperature within the set range. For the existing insulated liquid metering loss-in-weight scale, Youhua has optimized the overall layout structure and made full use of the limited space. On the basis of the original normal temperature liquid metering loss-in-weight scale, the added insulation interlayer and insulation pipes enable the precise measurement of special liquids (which need to be transported under certain temperature conditions). The metering pump and liquid storage tank adopt an integrated mounting bracket, and the bracket is directly welded and fixed to the base, which has a compact structure and improved stability, reducing the impact of the metering pump on the dynamic measurement of liquid transportation when it is working, making the measurement more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The figure is a schematic diagram of the overall structure of a compact thermal insulation liquid metering loss-in-weight scale in an embodiment of the present utility model.

[0013] Figure 2 This is a cross-sectional view of the overall structure of a compact thermal insulation liquid metering loss-in-weight scale in an embodiment of the present utility model.

[0014] Figure 3 This is a partial structural diagram illustrating the connection relationship between the interlayer pneumatic ball valve and the interlayer flange pipe in an embodiment of the present utility model.

[0015] Figure 4 It is a partial structural diagram for reflecting the weighing platform components in an embodiment of the present utility model.

[0016] Figure: 1. Base; 11. Pneumatic ball valve with interlayer; 12. Flange connection with interlayer; 13. First flexible connector; 2. Bracket; 3. Feeding barrel with interlayer; 31. Feeding barrel cover; 32. Liquid level gauge; 33. Manual ball valve; 4. Measuring barrel with interlayer; 41. Measuring barrel cover; 42. Electric heating rod; 43. Thermocouple; 5. Scale platform components; 51. Scale platform cover; 52. Protective block; 53. Scale base plate; 54. Rubber pad. 55. Weighing sensor; 56. Weighing platform; 57. Sensor gasket; 6. Insulated metering pump; 61. Interlayer tee; 62. Damper; 63. Oil pressure gauge; 64. Spray gun; 65. Interlayer lower pipe; 66. Second flexible connector; 67. Pump feed flexible elbow; 68. First Y-type filter; 7. Mold temperature controller; 71. Second Y-type filter; 72. Flexible loop hose; 73. Transfer pipe; 8. Forma caster. DETAILED DESCRIPTION

[0017] The embodiments of the present application provide a compact loss-in-weight scale for measuring thermal insulation liquids, thereby solving the technical problems in existing technical solutions that the loss-in-weight scales for measuring thermal insulation liquids are either too simple in structure and inaccurate in measurement, or too complex in structure, with too many connecting parts, many leakage points, and inaccurate measurement.

[0018] The technical solution in the embodiments of the present application is to solve the above problems, and the overall idea is as follows:

[0019] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0020] A compact loss-in-weight scale for measuring liquids with thermal insulation, such as Figure 1 、 Figure 2 、 Figure 3 as well as Figure 4As shown, the mold temperature controller 7 is mounted on the base 1 and includes a base 1, a support 2 mounted on the base 1, a feeding bucket 3 with a sandwich layer for feeding, a metering bucket 4 with a sandwich layer for metering, a weighing platform 5 for weighing the materials, a heat-insulating metering pump 6 for conveying the materials, and a mold temperature controller 7 mounted on the base 1. The weighing platform 5 is mounted on the base 1. The metering bucket 4 with a sandwich layer is mounted on the weighing platform 5. The feeding bucket 3 with a sandwich layer is mounted on the top of the support 2. The heat-insulating metering pump 6 is mounted on one side of the support 2.

[0021] The discharge pipe of the interlayer feeding barrel 3 and the feed port of the interlayer metering barrel 4 are connected in sequence via an interlayer pneumatic ball valve 11, an interlayer flange pipe 12, and a first flexible connector 13. A interlayer tee 61, a damper 62, and an oil pressure gauge 63 are installed at the top pump port of the thermal insulation metering pump 6. A spray gun 64 is installed on one side of the interlayer tee 61. A interlayer lower pipe 65, a second flexible connector 66, a pump feed flexible elbow 67, and a first Y-type filter 68 are installed at the bottom pump port of the thermal insulation metering pump 6. The pump feed flexible elbow 67 is located in the inner cavity of the interlayer metering barrel 4. The mold temperature controller 7 is connected to the interlayer feeding barrel 3 and the interlayer tee 61 via a second Y-type filter 71, a flexible loop hose 72, and a transfer pipe 73.

[0022] A feeding bucket cover 31 is provided at the opening of the interlayer feeding bucket 3. The feeding bucket cover 31 is mounted on the opening of the interlayer feeding bucket 3 by a clamp. A liquid level gauge 32 is mounted on the feeding bucket cover 31, and the liquid level gauge 32 is located in the inner cavity of the interlayer feeding bucket 3. A metering bucket cover 41 is provided at the opening of the interlayer metering bucket 4. The metering bucket cover 41 is mounted on the opening of the interlayer metering bucket 4 by a clamp. Manual ball valves 33 are provided at the discharge pipes of the interlayer feeding bucket 3 and the discharge pipes of the interlayer metering bucket 4. Insulation clothing is provided on the outside of the interlayer feeding bucket 3 and the interlayer metering bucket 4. An electric heating rod 42 and a thermocouple 43 are provided at the bottom end of the interlayer metering bucket 4.

[0023] The weighing platform component 5 includes a weighing platform cover 51, a protective block 52, a weighing base plate 53, a rubber pad 54, a weighing sensor 55, a weighing platform plate 56 and a sensor gasket 57. The weighing platform cover 51 is installed on the weighing base plate 53. Four groups of protective blocks 52 arranged in a rectangular array are provided at the connection between the weighing platform cover 51 and the weighing base plate 53. Four groups of rubber pads 54 arranged in a rectangular array are provided at the bottom of the weighing base plate 53. Each group of rubber pads 54 is connected to the base 1. The weighing sensor 55 is installed in the inner cavity of the weighing platform cover 51, and the bottom end of the weighing sensor 55 is connected to the sensor gasket 57. The sensor gasket 57 is set on the base 1. The weighing platform plate 56 is installed on the top of the weighing platform cover 51. The interlayer metering barrel 4 is installed on the weighing platform plate 56.

[0024] The bottom end of the base 1 is provided with four sets of Forma casters 8 arranged in a rectangular array.

[0025] Bracket 2 is fixedly connected to one side of the top of base 1. Mold temperature controller 7 is fixedly mounted on the other side of the top of base 1. Scale assembly 5 is fixedly mounted on the top of base 1 and located at the bottom end of bracket 2. Interlayer metering barrel 4 is fixedly mounted on the top of scale assembly 5. Interlayer feed barrel 3 is fixedly mounted on the top of bracket 2. Insulated metering pump 6 is fixedly mounted on one side of bracket 2. The discharge pipe of interlayer feed barrel 3 and the feed inlet of interlayer metering barrel 4 are fixedly connected in sequence via an interlayer pneumatic ball valve 11, an interlayer flange pipe 12, and a first flexible connector 13. An interlayer tee 61, a damper 62, and an oil pressure gauge 63 are fixedly mounted at the top pump port of insulated metering pump 6. A spray gun 64 is fixedly mounted on one side of interlayer tee 61. An interlayer lower pipe 65, a second flexible connector 66, a pump feed flexible elbow 67, and a first Y-type filter 68 are fixedly mounted at the bottom pump port of insulated metering pump 6. The mold temperature controller 7 is fixedly connected to the interlayer feeding barrel 3 and the interlayer tee pipe 61 through a second Y-type filter 71, a flexible loop hose 72, and a transfer pipe 73. The feeding barrel cover 31 is removably fixed to the opening of the interlayer feeding barrel 3 using a clamp. A liquid level gauge 32 is fixedly mounted on the feeding barrel cover 31 and is located within the inner cavity of the interlayer feeding barrel 3. The metering barrel cover 41 is removably fixed to the opening of the interlayer metering barrel 4 using a clamp. Manual ball valves 33 are fixedly mounted to the discharge pipes of the interlayer feeding barrel 3 and the discharge pipes of the interlayer metering barrel 4. Insulation jackets are fixedly mounted on the outsides of the interlayer feeding barrel 3 and the interlayer metering barrel 4. An electric heating rod 42 and a thermocouple 43 are fixedly mounted to the bottom end of the interlayer metering barrel 4. The scale cover 51 is fixedly mounted on the top of the scale base plate 53. Four sets of protective blocks 52 arranged in a rectangular array are fixedly installed at the connection between the weighing platform cover 51 and the weighing base plate 53. Four sets of rubber pads 54 arranged in a rectangular array are fixedly installed at the bottom of the weighing base plate 53. Each set of rubber pads 54 is fixedly connected to the top of the base 1. The weighing sensor 55 is fixedly installed in the inner cavity of the weighing platform cover 51, and the bottom end of the weighing sensor 55 is fixedly connected to the sensor gasket 57. The sensor gasket 57 is fixedly connected to the top of the base 1. The weighing platform plate 56 is fixedly installed on the top of the weighing platform cover 51. The interlayer measuring barrel 4 is fixedly installed on the top of the weighing platform plate 56. Four sets of Forma casters 8 arranged in a rectangular array are fixedly installed at the bottom end of the base 1.

[0026] Due to the arrangement of the base 1, the bracket 2, the interlayer feeding barrel 3, the interlayer metering barrel 4, the weighing platform 5, the heat-insulating metering pump 6 and the mold temperature controller 7, when the liquid level gauge 32 is at a low level alarm, manual feeding begins, and liquid is injected into the interlayer feeding barrel 3 through the small nozzle on the feeding barrel cover 31. When the liquid level gauge 32 is at a high level, the alarm stops, and the interlayer feeding barrel 3 is ready to feed at any time. Since the interlayer metering barrel 4 is fixedly mounted on the top of the weighing platform 5, the weighing sensor 55 senses that the weight of the liquid in the interlayer metering barrel 4 changes to the set minimum weight, and sends a signal to the control unit. The control unit controls the interlayer pneumatic ball valve 11 to open, and the interlayer feeding barrel 3 replenishes liquid to the interlayer metering barrel 4 through the interlayer pneumatic ball valve 11, the interlayer flange pipe 12 and the first flexible connector 13 until the liquid weight reaches the set maximum weight. After the weighing sensor 55 senses this situation, it sends a signal to the control unit, which controls the pneumatic ball valve 11 with interlayer to close, completing a feeding. The control unit also controls the heat preservation metering pump 6 to feed the lower end equipment such as extruders, mixers, reactors, etc. according to the set flow rate and pressure. The heat preservation metering pump 6 is running, continuously extracting liquid from the interlayer metering barrel 4, filtering it through the first Y-type filter 68, and then pumping it out from the heat preservation metering pump 6 through the pump feed flexible elbow 67 to the pump head of the heat preservation metering pump 6. It is then sprayed out from the spray gun 64 through the interlayer three-way pipe 61. The whole process is a dynamic weighing and metering process. Since the discharge pipes of the interlayer feeding barrel 3 and the discharge pipes of the interlayer metering barrel 4 are fixedly installed with manual ball valves 33, the manual ball valves 33 are used to release the insulation oil in the interlayer. At the same time, the manual ball valves 33 are used to drain the old materials when the interlayer feeding barrel 3 and the interlayer metering barrel 4 are replaced. The pump feed flexible elbow 67, the first flexible connector 13, the second flexible connector 66, and the rubber pad 54 are all flexible components that isolate the movement and shaking of upstream and downstream equipment from affecting weighing. The protective block 52 is used to prevent pressure or tension beyond the measuring range of the weighing sensor 55 from directly acting on the weighing sensor 55 during transportation. Before transportation, the scale base 53 and the scale table 56 are directly and rigidly connected with bolts to maximize protection of the weighing sensor 55. The protective block 52 is removed during measurement. The mold temperature controller 7 forms an insulation circuit with the interlayer sleeve in the device. Thermal oil is placed in the interlayer, and the mold temperature controller 7 heats and insulates it to control the temperature. The insulation jacket of the feeding barrel and the insulation jacket of the metering barrel also assist in insulation. The interlayer metering barrel 4 has a refueling port, and thermal oil is placed in its interlayer. It is heated and insulated by the electric heating rod 42, and the temperature is sensed by the thermocouple 43 and fed back to the control unit, which controls the insulation temperature within the set range.For the existing insulated liquid metering loss-in-weight scale, Youhua has optimized the overall layout structure and made full use of the limited space. On the basis of the original normal temperature liquid metering loss-in-weight scale, the added insulation interlayer and insulation pipes enable the precise measurement of special liquids (which need to be transported under certain temperature conditions). The metering pump and liquid storage tank adopt an integrated mounting bracket, and the bracket is directly welded and fixed to the base, which has a compact structure and improved stability, reducing the impact of the metering pump on the dynamic measurement of liquid transportation when it is working, making the measurement more accurate.

[0027] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0028] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A compact thermal insulation liquid metering loss-in-weight scale, characterized in that: The invention comprises a base (1), a bracket (2) arranged on the base (1), a feeding barrel with an interlayer (3) for feeding, a metering barrel with an interlayer (4) for metering materials, a weighing platform component (5) for weighing materials, a heat-insulating metering pump (6) for conveying materials, and a mold temperature controller (7) installed on the base (1); the weighing platform component (5) is installed on the base (1); the metering barrel with an interlayer (4) is arranged on the weighing platform component (5); the feeding barrel with an interlayer (3) is installed on the top of the bracket (2); and the heat-insulating metering pump (6) is installed on one side of the bracket (2); The discharge pipe of the interlayer feeding barrel (3) and the feed port of the interlayer metering barrel (4) are connected in sequence through an interlayer pneumatic ball valve (11), an interlayer flange pipe (12) and a first flexible connector (13); the top pump port of the heat-insulating metering pump (6) is installed with an interlayer tee pipe (61), a damper (62) and an oil pressure gauge (63) in sequence; a spray gun (64) is installed on one side of the interlayer tee pipe (61); the bottom end of the heat-insulating metering pump (6) is connected with an interlayer pneumatic ball valve (11), an interlayer flange pipe (12) and a first flexible connector (13); the top pump port of the heat-insulating metering pump (6) is installed with an interlayer tee pipe (61), a damper (62) and an oil pressure gauge (63 ...) in sequence; the bottom end of the heat-insulating metering pump (6) is connected with an interlayer pneumatic ball valve (11), an interlayer flange pipe (12) and a first flexible connector (13); the top pump port of the heat-insulating metering pump (6) is connected with an interlayer tee pipe (61), a damper (62) and an oil pressure gauge (63) in sequence; the bottom end of the heat-insulating metering pump (6) is connected with an interlayer pneumatic ball valve (11), a damper (62) and an oil pressure gauge (63) in sequence; the bottom end of the heat-insulating metering pump (6) is connected with an interlayer pneumatic ball valve (11), a damper (62) and an oil The pump port is sequentially provided with a lower connecting pipe with interlayer (65), a second soft connector (66), a pump feed flexible elbow (67) and a first Y-type filter (68); the pump feed flexible elbow (67) is located in the inner cavity of the interlayer metering barrel (4); the mold temperature controller (7) is connected to the interlayer feeding barrel (3) and the interlayer three-way pipe (61) through the second Y-type filter (71), the flexible loop hose (72) and the transfer pipe (73) respectively.

2. A compact thermal insulation liquid loss-in-weight scale according to claim 1, characterized in that: The interlayer feeding barrel (3) is provided with a feeding barrel cover (31) at the opening; the feeding barrel cover (31) is installed at the opening of the interlayer feeding barrel (3) through a clamp; a liquid level gauge (32) is installed on the feeding barrel cover (31), and the liquid level gauge (32) is located in the inner cavity of the interlayer feeding barrel (3); a metering barrel cover (41) is provided at the opening of the interlayer metering barrel (4); the metering barrel cover (41) is installed at the opening of the interlayer metering barrel (4) through a clamp; manual ball valves (33) are provided at the discharge pipe of the interlayer feeding barrel (3) and the discharge pipe of the interlayer metering barrel (4); thermal insulation clothes are provided on the outside of the interlayer feeding barrel (3) and the interlayer metering barrel (4); an electric heating rod (42) and a thermocouple (43) are provided at the bottom end of the interlayer metering barrel (4).

3. A compact thermal insulation liquid loss-in-weight scale according to claim 1, characterized in that: The weighing platform component (5) includes a weighing platform cover (51), a protection block (52), a weighing base (53), a rubber pad (54), a weighing sensor (55), a weighing platform plate (56) and a sensor gasket (57); the weighing platform cover (51) is installed on the weighing base (53); four groups of the protection blocks (52) arranged in a rectangular array are provided at the connection between the weighing platform cover (51) and the weighing base (53); four groups of the weighing base (53) arranged in a rectangular array are provided at the bottom of the weighing base (53). The rubber pads (54) are placed; each group of the rubber pads (54) is connected to the base (1); the weighing sensor (55) is installed in the inner cavity of the weighing platform cover (51), and the bottom end of the weighing sensor (55) is connected to the sensor gasket (57); the sensor gasket (57) is set on the base (1); the weighing platform plate (56) is installed on the top of the weighing platform cover (51); the interlayer metering barrel (4) is installed on the weighing platform plate (56).

4. A compact thermal insulation liquid loss-in-weight scale according to claim 1, characterized in that: The bottom end of the base (1) is provided with four groups of Forma casters (8) arranged in a rectangular array.

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