Aluminum melting furnace with molten aluminum lifting device

Abstract

This utility model relates to the field of production technology in the aluminum smelting and casting industry. It provides an aluminum furnace with an aluminum molten metal lifting device, comprising an aluminum furnace, a channel, a molten pool, a flow channel, a lifting sensor, and a liquid level detection device. Through this technical solution, the aluminum furnace acquires the function of lifting molten aluminum. In this utility model, when it is necessary to lift the molten aluminum, the lifting sensor is activated, which lifts the molten aluminum to a predetermined height, and then transports it to the next process through the flow channel. The liquid level detection device detects the liquid level height of the molten aluminum in the flow channel and converts it into a control signal for the lifting sensor, which is used to adjust the lifting force of the lifting sensor, thereby controlling the output flow rate of the molten aluminum. This utility model enables the aluminum furnace to have an aluminum molten metal lifting function, replacing the expensive tilting furnace, and is easy to control.

Description

Technical Field

[0001] This utility model relates to the field of production technology in the aluminum melting and casting industry, specifically to an aluminum furnace with an aluminum molten metal lifting device. Background Technology

[0002] In the aluminum smelting and casting industry, after the aluminum melt in the aluminum furnace is melted, it needs to be transported to the next process. Therefore, the height of the next process station must be lower than the aluminum melt outlet of the aluminum furnace. If the height of the next process station is relatively high, the height of the aluminum furnace needs to be designed to be appropriate to increase the height of the aluminum melt outlet. This requires increasing the height of the plant, which not only increases the construction investment but also causes misalignment of large equipment such as aluminum furnaces, making the production process inconvenient.

[0003] In existing technologies, aluminum plants use tilting furnaces to control the flow rate of molten aluminum out of the furnace. These tilting furnaces, controlled by a hydraulic system, can adjust their tilt angle, thereby controlling the outflow rate of the molten aluminum from the tap. Since aluminum furnaces often weigh hundreds of tons, and the main materials constituting them—such as the erosion-resistant layer, leak-proof layer, and insulation layer—are all materials with poor mechanical toughness, insufficient rigidity in the overall structure of the tilting furnace can cause deformation when tilted, leading to cracks in these materials and subsequent aluminum leakage. This necessitates production shutdowns and major repairs, resulting in significant losses. Therefore, aluminum furnaces require a robust and complex overall structure, resulting in high costs. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides an aluminum furnace with an aluminum molten metal lifting device. The aluminum molten metal is lifted by the electromagnetic lifting device and transported to the next process through a flow channel. It is inexpensive and easy to control.

[0005] At least one embodiment of the present invention provides an aluminum furnace with an aluminum molten metal lifting device, comprising: an aluminum furnace, a molten pool provided on the side of the aluminum furnace, and a lifting sensor provided on the long side of the molten pool; The electromagnetic lifting device for molten aluminum includes a channel located at the bottom of the aluminum furnace and connected to the furnace and the molten pool. A flow channel is fixedly connected to the top of the molten pool. A dike is provided at the bottom of the aluminum furnace, with a notch near the side wall of the furnace to serve as a channel for molten aluminum to enter the molten pool. The width of the notch is 50 to 200 mm. An aluminum inlet is provided on the side of the dike, through which molten aluminum enters the molten pool. An aluminum outlet is provided at the bottom of the molten pool.

[0006] For example, in an aluminum furnace with an aluminum molten metal lifting device provided in at least one embodiment of the present invention, the height of the molten pool is higher than the highest liquid level of the aluminum molten metal in the aluminum furnace, and the bottom of the inner cavity of the molten pool is 100 mm to 800 mm lower than the bottom of the aluminum furnace. The purpose is to ensure that the aluminum molten metal in the aluminum furnace can still be lifted to the required height by the electromagnetic lifting device after the liquid level drops.

[0007] The height of the cofferdam is set to 20 to 200 mm, the width of the cofferdam is set to 50 to 300 mm, and the width of the aluminum inlet is set to 50 to 500 mm. The purpose of setting the cofferdam is to prevent molten slag from the bottom of the furnace from flowing into the molten pool.

[0008] The molten pool is rectangular in shape, with a short side of 80 mm to 400 mm and a long side of 400 mm to 1000 mm; the wall thickness of the molten pool is 50 mm to 600 mm. The diameter of the aluminum outlet is 30 mm to 100 mm, which is intended to facilitate the discharge of molten aluminum from the molten pool during maintenance.

[0009] For example, in at least one embodiment of this utility model, an aluminum furnace with an aluminum molten metal lifting device further includes: the lifting sensor comprising an iron core, coil windings, and a housing; the coil windings being of the Cramer type, the purpose of which is to facilitate the setting of more windings within the limited length of the iron core, ensuring that the aluminum molten metal in the furnace can still be lifted to a specified height when the liquid level decreases. The number of coil windings is 3 to 15.

[0010] The lifting sensor is placed in the center of the long side of the molten pool. The long side of the molten pool can be parallel to the side wall of the aluminum furnace to which the molten pool is adjacent, but only one lifting sensor can be installed in this way; or the short side of the molten pool can be parallel to the side wall of the aluminum furnace to which the molten pool is adjacent, but in this way, one lifting sensor needs to be installed on each of the two long sides of the molten pool, and the two lifting sensors are placed opposite each other. The lifting sensor is powered by a two-phase or three-phase AC power supply. Driven by the AC power supply, the lifting sensor forms an upward traveling wave magnetic field. The molten aluminum in the molten pool moves upward under the drive of the traveling wave magnetic field and is transported to the next process through the flow channel at the top of the molten pool.

[0011] In another aspect, at least one embodiment of the present invention also provides an aluminum furnace with an aluminum molten liquid lifting device, comprising: a liquid level detection device provided on the top of the molten pool, the liquid level detection device being composed of a support frame, a flow stabilizing device, and a liquid level gauge, the liquid level detection device being fixed on a flow channel above the molten pool; slots being provided on two side walls of the flow channel, and insert plates being installed in the slots.

[0012] The support frame consists of a fixed plate, a top panel, a heat insulation plate, and structural components. The fixed plate and the top panel are made of heat-resistant non-metallic materials, such as silicon nitride plates and silicon carbide plates.

[0013] The flow stabilizing device consists of an insert plate and an insert plate lifting device. The insert plate is made of heat-resistant non-metallic materials, such as silicon nitride plates and silicon carbide plates. The end of the insert plate near the bottom of the flow channel is densely covered with flow guide holes with a diameter of 2 to 6 mm, arranged in 1 to 5 rows. The insert plate lifting device consists of a motor reducer, a lifting rod, and a fixing pin. The insert plate is installed in the slot of the flow channel. The motor reducer drives the lifting rod to move up and down. The lifting rod is connected to the insert plate, thereby driving the insert plate to move up and down, realizing the adjustment of the flow channel area of ​​the aluminum melt in the flow channel. The liquid level detection device is a non-contact liquid level measurement method, which can be a laser liquid level meter or an ultrasonic liquid level meter, etc. The liquid level meter is installed on a support frame.

[0014] The distance from the bottom surface of the insert plate to the bottom of the flow channel is 5 to 150 mm, and the distance from the surface of the insert plate to the inner surface of the molten pool away from the aluminum furnace is 50 to 400 mm. The distance from the centerline of the level gauge to the surface of the insertion plate is 100 to 800 mm; In order to accurately detect the output flow rate of molten aluminum, it is necessary to accurately detect the liquid level of molten aluminum in the flow channel. For this purpose, a flow stabilizing device is installed in the flow channel. The flow stabilizing device consists of a baffle plate and a baffle plate lifting device, which works in conjunction with the liquid level detection.

[0015] The molten aluminum lifted into the flow channel by the electromagnetic lifting device is in a surging state. The surging state of the molten aluminum makes it difficult to accurately detect the liquid level, thus requiring flow stabilization. Part of the molten aluminum lifted into the flow channel by the electromagnetic lifting device flows out through the guide holes on the insert plate, and part flows out through the channel formed by the bottom surface of the insert plate and the bottom of the flow channel, thereby suppressing the surging of the molten aluminum. A level gauge fixed to the upper panel of the support frame detects the change in the liquid level of the molten aluminum in the flow channel per unit time. When the change in liquid level exceeds the allowable set value, the system automatically activates the flow stabilization device, adjusting the area through which the molten aluminum passes between the bottom of the insert plate and the bottom of the flow channel. This process is repeated, continuously adjusting to achieve a stable liquid level in the molten aluminum. The unit time for the change in the liquid level of the molten aluminum is between 10 seconds and 120 seconds.

[0016] The liquid level of molten aluminum directly reflects its flow rate. By appropriately transforming the detection signal from the level gauge, the voltage, current, or frequency of the input power supply to the lifting sensor can be used to control the flow rate of molten aluminum in the furnace, thus achieving both lifting and flow control of the molten aluminum.

[0017] The beneficial effects of the embodiments of this utility model are as follows: In this invention, an aluminum furnace with an electromagnetic lifting device replaces the expensive tilting furnace, greatly reducing the construction cost of the production line. Since the furnace body is stationary, it not only reduces the requirements for furnace body rigidity but also greatly extends the life of the aluminum furnace. Adjusting the voltage, current, or frequency of the electromagnetic lifting device's power supply can control the lifting capacity of the electromagnetic lifting device, thereby controlling the flow rate of molten aluminum. This convenient control is beneficial for improving the automation level of the production line.

[0018] When it is necessary to transport molten aluminum from the aluminum furnace to the next process, the electromagnetic lifting device is activated. Driven by the electromagnetic lifting device, the molten aluminum in the molten pool enters the flow channel. The liquid level detection device fixed on the flow channel detects the liquid level in the flow channel and converts it into a flow rate value. This value is compared with the given flow rate value, and a corresponding control signal is output to adjust the output capacity of the electromagnetic lifting device, thereby realizing the lifting of molten aluminum and the output control of the flow rate.

[0019] This utility model has a simple structure, low cost, and convenient and accurate control. It can not only significantly reduce the construction cost of production lines in the aluminum smelting and casting industry, but also help improve the automation level of the production line. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0021] Figure 1 This is a structural schematic diagram of the overall three-dimensional appearance of the aluminum furnace in one embodiment of the present invention; Figure 2 This is a three-dimensional cross-sectional structural schematic diagram of the electromagnetic lifting device for molten aluminum in one embodiment of the present invention; Figure 3 This is a three-dimensional enlarged structural schematic diagram of the liquid level detection device in one embodiment of the present invention; Figure 4 This is a three-dimensional cross-sectional structural schematic diagram of the lifting sensor in one embodiment of the present invention; Figure 5 This is a three-dimensional enlarged structural schematic diagram of the current stabilizing device in one embodiment of the present invention.

[0022] In the diagram: 1. Aluminum furnace; 2. Molten pool; 3. Electromagnetic lifting device for molten aluminum; 31. Channel; 32. Flow channel; 33. Dike; 34. Aluminum inlet; 35. Aluminum outlet; 36. Lifting sensor; 361. Iron core; 362. Coil winding; 363. Outer shell; 4. Liquid level detection device; 41. Support frame; 411. Fixing plate; 412. Top panel; 413. Heat insulation plate; 42. Liquid level gauge; 5. Flow stabilizing device; 51. Insert plate; 511. Flow guide hole; 52. Insert plate lifting device; 521. Motor reducer unit; 522. Lifting rod; 523. Fixing pin. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0024] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0025] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] like Figures 1-5 As shown, it illustrates an aluminum furnace with an aluminum molten metal lifting device in one embodiment of the present invention, comprising: an aluminum furnace 1, a molten pool 2 fixedly connected to the side of the aluminum furnace 1, and an aluminum molten metal electromagnetic lifting device 3 provided in the molten pool 2; The aluminum molten electromagnetic lifting device 3 includes a channel 31, which is located at the bottom of the aluminum furnace 1 and is connected to the aluminum furnace 1 and the molten pool 2. A flow channel 32 is fixedly connected to the top of the molten pool 2. A weir 33 is fixedly connected inside the aluminum furnace 1. An aluminum inlet 34 is opened on the side of the weir 33. An aluminum outlet 35 is opened on the side of the molten pool 2. A lifting sensor 36 is installed on the side of the molten pool 2.

[0030] In some examples, the height of the molten pool 2 is higher than the highest liquid level of the molten aluminum in the aluminum furnace 1, and the inner bottom of the molten pool 2 is 100 mm to 800 mm lower than the bottom of the aluminum furnace 1. The purpose is to ensure that after the liquid level of the molten aluminum in the aluminum furnace 1 is reduced, it can still flow into the molten pool 2 through the channel 31 and be lifted to the flow channel 32 by the electromagnetic lifting device 3.

[0031] The height of the cofferdam 33 is set to 20 to 200 mm, the width of the cofferdam 33 is set to 50 to 300 mm, and the width of the aluminum inlet 34 is set to 50 to 500 mm. The purpose is to prevent the molten slag at the bottom of the furnace from flowing into the molten pool 2, while ensuring that the low-level molten aluminum at the bottom of the furnace can flow into the molten pool 2.

[0032] The molten pool 2 is rectangular in shape, with an inner cavity side length of 80 mm to 1000 mm, and the aluminum outlet 35 has a diameter of 30 to 100 mm. The purpose of this is to facilitate the discharge of molten aluminum from the molten pool 2 during maintenance.

[0033] The lifting sensor 36 includes an iron core 361, a coil winding 362, and a housing 363. The coil winding 362 is wound in a Cramer configuration, the purpose of which is to wind as many windings 362 as possible over the limited length of the iron core 361 to ensure that the low-level molten aluminum can be lifted to the required height.

[0034] The lifting sensor 36 is placed in the center of the long side of the molten pool 2. When the long side of the molten pool 2 is parallel to the side wall of the aluminum furnace 1 adjacent to the molten pool 2, one lifting sensor 36 is installed; when the short side of the molten pool 2 is parallel to the side wall of the aluminum furnace 1 adjacent to the molten pool 2, one lifting sensor 36 is installed on each of the two long sides of the molten pool 2, and the two lifting sensors 36 are placed opposite each other. For example, such as Figures 1-5 As shown, molten aluminum in aluminum furnace 1 flows into molten pool 2 through channel 31. To prevent slag from the bottom of aluminum furnace 1 from flowing into molten pool 2, a weir 33 is installed at the bottom of the furnace. When it is necessary to transport molten aluminum to the next process, the lifting sensor is activated. Driven by the AC drive power supply, the lifting sensor generates an upward traveling wave magnetic field. The traveling wave magnetic field acts on the molten aluminum in molten pool 2, causing the molten aluminum in the molten pool to move upward and enter the next process through the flow channel. When the aluminum furnace needs maintenance, after emptying the molten aluminum in the aluminum furnace, the remaining molten aluminum in the molten pool is discharged through the aluminum outlet 35.

[0035] like Figures 1-5 As shown, it illustrates an aluminum furnace with an aluminum melt lifting device in another embodiment of the present invention, including: a liquid level detection device 4 is provided on the top of the flow channel 32, and the liquid level detection device 4 is composed of a support frame 41, a flow stabilizing device 5, and a liquid level gauge 42.

[0036] The support frame 41 consists of a fixed plate 411, a top panel 412, a heat insulation plate 413, and structural components. The fixed plate 411 and the top panel 512 are made of heat-resistant non-metallic materials, such as silicon nitride plates and silicon carbide plates.

[0037] The flow stabilizing device 5 consists of an insert plate 51 and an insert plate lifting device 52. The insert plate 51 is made of heat-resistant non-metallic materials, such as silicon nitride plates and silicon carbide plates. The end of the insert plate 51 near the bottom of the flow channel 32 is densely covered with flow guide holes 511 with a diameter of 2 to 6 mm, and the flow guide holes 511 are arranged in 1 to 5 rows. The insert plate lifting device 52 consists of a motor reducer unit 521, a lifting rod 522 and a fixing pin 523. The insert plate 51 is installed in the slot of the flow channel 32. The motor reducer unit 521 drives the lifting rod 522 to move up and down. The lifting rod 522 is connected to the insert plate 51, thereby driving the insert plate 51 to move up and down, realizing the adjustment of the flow channel area of ​​the aluminum melt in the flow channel 32. The level gauge 42 is a non-contact level measurement device, which can be a laser level gauge or an ultrasonic level gauge, etc. The level gauge 42 is mounted on the support frame 51.

[0038] The distance from the bottom surface of the insert plate 51 to the bottom of the flow channel 32 is 5 to 150 mm, and the distance from the surface of the insert plate 51 to the inner surface of the molten pool 2 away from the aluminum furnace 1 is 50 to 400 mm. The distance from the centerline of the liquid level detection device to the surface of the insertion plate 51 is 100 to 800 mm; When it is necessary to transfer the molten aluminum in aluminum furnace 1 to the next process, start molten aluminum Electromagnetic lifting device 3, molten aluminum in molten pool 2 molten aluminum Driven by the electromagnetic lifting device 3, the molten aluminum enters the flow channel 32. The molten aluminum flows out through the channels formed by the guide holes 511 at the bottom of the insert plate 51 and the bottom of the flow channel 32. The setting of the guide holes 511 has a positive effect on stabilizing the flow field of the molten aluminum. The level gauge 42, which is fixed on the upper panel 412 of the support frame 41, detects the change in the liquid level height of the molten aluminum in the flow channel 32 per unit time. When the change in the liquid level height exceeds the allowable set value, the flow stabilizing device 5 is activated to adjust the area through which the molten aluminum passes between the bottom of the insert plate 51 and the bottom of the flow channel 32. Then, the change in the liquid level height per unit time is measured again. This process is continuously adjusted to make the flow field of the molten aluminum in the flow channel 32 tend to be stable, thus achieving the effect of flow stabilization. This ensures the accurate measurement of the liquid level of the molten aluminum in the flow channel 32, which is of great significance for accurately determining the flow rate of the molten aluminum. The liquid level of the molten aluminum directly reflects its flow rate. The detection signal from the level gauge 32 is appropriately transformed to control the voltage, current, or frequency of the input power supply of the lifting sensor 36, thereby controlling the outflow speed and flow rate of the molten aluminum in the aluminum furnace 1, thus realizing the lifting and flow control of the molten aluminum.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An aluminum furnace with an aluminum molten metal lifting device, characterized in that, include: An aluminum furnace (1) is provided with a molten pool (2) fixedly connected to its side, and the molten pool (2) is provided with an electromagnetic lifting device (3) for molten aluminum. The electromagnetic lifting device (3) for molten aluminum includes a channel (31), which is located at the bottom of the aluminum furnace (1). The channel (31) is connected to the aluminum furnace (1) and the molten pool (2). A flow channel (32) is fixedly connected to the top of the molten pool (2). A weir (33) is provided inside the aluminum furnace (1). An aluminum inlet (34) is provided on the side of the weir (33). An aluminum outlet (35) is provided on the side of the molten pool (2). A lifting sensor (36) is provided on the side of the molten pool (2).

2. The aluminum furnace with an aluminum molten metal lifting device according to claim 1, characterized in that, The height of the molten pool (2) is higher than the highest liquid level of the molten aluminum in the aluminum furnace (1), and the inner bottom of the molten pool (2) is 100 mm to 800 mm lower than the bottom of the aluminum furnace (1).

3. The aluminum furnace with an aluminum molten metal lifting device according to claim 2, characterized in that, The height of the cofferdam (33) is set to 20 to 200 mm, the width of the cofferdam (33) is set to 50 to 300 mm, and the width of the aluminum inlet (34) is set to 50 to 500 mm.

4. The aluminum furnace with an aluminum molten metal lifting device according to claim 3, characterized in that, The molten pool (2) is rectangular in shape, with a short side of 80 to 400 mm and a long side of 400 to 1000 mm; the wall thickness of the molten pool (2) is 50 to 600 mm; and the diameter of the aluminum outlet (35) is 20 to 80 mm.

5. An aluminum furnace with an aluminum molten metal lifting device according to claim 4, characterized in that, The lifting sensor (36) includes an iron core (361), a coil winding (362) and a housing (363), wherein the coil winding (362) is in the form of a cramm winding and the number of coils is 3 to 15.

6. An aluminum furnace with an aluminum molten metal lifting device according to claim 5, characterized in that, The lifting sensor (36) is placed in the center of the long side of the molten pool (2); when the long side of the molten pool (2) is parallel to the side wall of the aluminum furnace adjacent to the molten pool (2), one lifting sensor (36) is installed; when the short side of the molten pool (2) is parallel to the side wall of the aluminum furnace adjacent to the molten pool (2), one lifting sensor (36) is installed on each of the two long sides of the molten pool (2), and the two lifting sensors (36) are placed opposite each other. The lifting sensor (36) is powered by two-phase or three-phase AC power.

7. An aluminum furnace with an aluminum molten metal lifting device according to claim 6, characterized in that, The inner side of the flow channel (32) is provided with a slot, and a liquid level detection device (4) is provided on the flow channel (32). The liquid level detection device (4) consists of a support frame (41), a flow stabilizing device (5), and a liquid level gauge (42). The support frame (41) consists of a fixing plate (411), a top panel (412), and a heat insulation plate (413). The liquid level gauge (42) is a non-contact liquid level measurement method, and the liquid level gauge (42) is installed on the support frame (41).

8. An aluminum furnace with an aluminum molten metal lifting device according to claim 7, characterized in that, The flow stabilizing device (5) consists of a plug plate (51) and a plug plate lifting device (52). The plug plate (51) is densely covered with guide holes (511) with a diameter of 2 to 6 mm at one end near the bottom of the flow channel (32). The guide holes (511) are arranged in 1 to 5 rows. The plug plate (51) is installed in the slot of the flow channel (32).

9. An aluminum furnace with an aluminum molten metal lifting device according to claim 8, characterized in that, The insert plate lifting device (52) consists of a motor reducer unit (521), a lifting rod (522), and a fixing pin (523).

10. An aluminum furnace with an aluminum molten metal lifting device according to claim 9, characterized in that, The distance from the bottom surface of the insert plate (51) to the bottom of the flow channel (32) is 5 to 150 mm, the distance from the surface of the insert plate (51) to the inner surface of the molten pool (2) away from the aluminum furnace (1) is 50 to 400 mm, and the distance from the center line of the level gauge (42) to the surface of the insert plate (51) is 100 to 800 mm.

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