An electronic scale for box-type molten steel ladle with a weighing compensation argon supply device

Abstract

The invention discloses a box-type ladle electronic scale with a weighing compensation argon supply device, which comprises a weighing box body. Two high-temperature resistant weighing sensors are installed in the weighing box body. A pressure-bearing head is installed on the high-temperature resistant weighing sensor, and the pressure-bearing head directly applies the gravity of the ladle it bears on the high-temperature resistant weighing sensor. The weighing box body is provided with a weighing compensation argon supply device for independently collecting the weight received by the docking of the argon blowing device. The weighing compensation argon supply device is a separate metering component assembled by the lower part of the argon blowing device, a weighing accessory and a compensation weighing sensor. The lower part of the argon blowing device is connected with an argon supply pipe, and the lower part of the argon blowing device realizes the sealed docking of the argon supply path with the upper part of the argon blowing device installed on the ladle in a way of displacement elastic compensation contact. The invention has a simple structure, is convenient to maintain, can detect the component force generated by the docking of the argon blowing device, and realizes the online accurate metering of the ladle through component force compensation.

Description

Technical Field

[0001] The present invention relates to a measuring instrument, in particular to a ladle electronic scale, and specifically to a box-type ladle electronic scale with a weighing compensation argon supply device. Background Art

[0002] Modern steel smelting processes are constantly being updated and improved. The argon blowing refining technology outside the furnace has become an essential refining process. The manual docking argon blowing method has gradually been replaced by an automatic argon blowing sealing device, making the argon blowing process for refining outside the furnace more scientific and effective. By installing an automatic argon blowing sealing device, it can greatly meet the process requirements for on-line weighing of the ladle during steel smelting. At the same time, it can control the production processes of each link, improve production efficiency, reduce production capacity consumption, and can be used as a reference for internal cost accounting of production costs.

[0003] Currently, in the industry, an on-line weighing is generally achieved by using a weighing box electronic scale with a semi-sealed frame structure. This kind of electronic scale is convenient for installation and maintenance. During operation, the ladle ear seat directly transfers the force through the pressure head of the electronic scale to the weighing sensor to achieve weighing. The automatic argon blowing sealing device includes an upper part of the automatic argon blowing sealing device installed under the ladle ear seat and a lower part of the automatic argon blowing device installed on the box body of the weighing box electronic scale. When the ladle electronic scale weighs the ladle in the sitting position, the upper and lower parts of the automatic argon blowing device are hermetically docked, which inevitably shares a part of the force of the entire ladle weight, thus affecting the weighing accuracy of the weighing box electronic scale. Therefore, how to make the weighing box electronic scale meet the argon blowing process requirements for refining outside the furnace and at the same time solve the force compensation caused by the automatic argon blowing sealing device has become an urgent technical problem to be solved in this industry. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a box-type ladle electronic scale with a weighing compensation argon supply device in view of the current situation of the above-mentioned prior art. This box-type ladle electronic scale can detect and compensate for the component force generated by the docking of the upper and lower parts of the automatic argon blowing device, thereby improving the weighing accuracy of the electronic scale for the ladle.

[0005] The technical solution adopted by the present invention to solve the above technical problem is as follows:

[0006] A box-type ladle electronic scale with a weighing compensation argon supply device, comprising a weighing box body with a semi-sealed frame structure. Two high-temperature resistant weighing sensors for weighing and measuring the ladle are symmetrically installed on the left and right in the weighing box body. A pressure-bearing head for cooperating with the support of the ladle is fixedly installed on the high-temperature resistant weighing sensor, and the gravity of the ladle borne by the pressure-bearing head is directly applied to the high-temperature resistant weighing sensor. A weighing compensation argon supply device for independently collecting the weight received by the sealed docking of the argon blowing device is provided on the weighing box body. The weighing compensation argon supply device is a separate measuring component composed of the lower part of the argon blowing device, a weighing accessory, and a compensation weighing sensor. The lower part of the argon blowing device is connected with an argon supply pipe, and the lower part of the argon blowing device realizes the sealed docking of the argon supply path with the upper part of the argon blowing device installed on the ladle in a way of displacement elastic compensation contact when the ladle is seated and weighed.

[0007] To optimize the above technical solution, the specific measures taken also include:

[0008] The lower part of the above-mentioned argon blowing device includes a lower joint for sealed docking with the upper part of the argon blowing device, eight disc springs arranged in equal arcs on the bottom surface of the lower joint for providing elastic compensation for the lower joint, and a flange for assembling the lower joint on the weighing accessory. The flange is fixedly connected to the weighing accessory by bolts. The lower part of the lower joint is slidably arranged in a joint clamping cavity formed by the flange in a way that prevents detachment. The upper part of the lower joint extends out of the joint clamping cavity, and a sealing ring for sealing is installed on the top surface of the lower joint.

[0009] A ventilation hole is formed through the center of the top surface of the above-mentioned lower joint downward. A connecting pipe convenient for connecting with the argon supply pipe is welded to the bottom opening of the ventilation hole. The upper opening of the ventilation hole is reamed to form a positioning cavity into which the upper joint of the upper part of the argon blowing device can be positioned and clamped. Eight spring guide posts are fixedly installed on the bottom surface of the lower joint, and the disc springs are sleeved on the above-mentioned spring guide posts.

[0010] A central through hole for passing the argon supply pipe is formed in the center of the above-mentioned weighing accessory. Eight spring cavities for accommodating the disc springs, eight counterbore holes for passing bolts to fixedly install the weighing accessory on the compensation weighing sensor, and four flange screw holes for helically mating with the bolts of the installation flange are formed on the weighing accessory. The eight counterbore holes and the eight spring cavities are circumferentially alternately arranged on the weighing accessory. The lower end of the disc spring abuts against the annular step surface in the spring cavity in a mating manner, and the upper end of the disc spring presses against the bottom surface of the lower joint.

[0011] The above-mentioned compensated load cell is a circular plate load cell with an air pipe through-hole formed at the center. On the circular weighing pan of the compensated load cell, eight accessory screw holes that are helically engaged with the bolts for installing the weighing accessory are formed corresponding to the counterbore holes of the weighing accessory. And the bottom surface of the weighing accessory is formed with a nested cavity that is nested and positioned with the circular weighing pan, and a copper adjustment gasket for maintaining balance is provided in the nested cavity. Six assembly holes are formed on the circular base of the compensated load cell, and a compensated weighing signal wire for uploading the weighing data detected by the compensated load cell is led out from the bottom surface of the circular base.

[0012] The above-mentioned weighing box body is composed of a box base and a box frame body welded and installed on the box base. A sensor base is fixedly installed on the box base, and a high-temperature resistant load cell is fixedly installed on the sensor base through a first bolt. The lower end of the pressure-bearing head is press-fitted on the high-temperature resistant load cell, and the upper end of the pressure-bearing head slidably passes through the frame top plate of the box frame body. A pressure-bearing head guide hole for the pressure-bearing head to pass through is formed on the frame top plate of the box frame body.

[0013] A high-temperature resistant buffer sleeve that is slidably sleeved with the pressure-bearing head is installed in the above-mentioned pressure-bearing head guide hole. An annular gland for preventing falling steel slag from entering the pressure-bearing head guide hole is installed at the upper opening of the pressure-bearing head guide hole, and the pressure-bearing head slidably passes through the central sliding hole of the annular gland.

[0014] An installation rack plate for installing a weighing compensation argon supply device is provided on the above-mentioned box frame body. A sensor bottom plate is welded on the installation rack plate. Sensor screw holes are formed on the sensor bottom plate. The weighing compensation argon supply device is installed on the sensor bottom plate through bolts passing through the assembly holes of the compensated load cell. Air pipe through-holes for the argon supply pipe to pass through and signal wire through-holes for the compensated weighing signal wire to pass through are formed on both the installation rack plate and the sensor bottom plate.

[0015] An inclined slag guiding surface that can make the falling steel slag roll off the frame top plate is formed on the top surface of the above-mentioned frame top plate. And a steel slag diversion rack for guiding the rolled-down steel slag out is provided in front of the box frame body, and a heat insulation plate for preventing heat radiation is arranged behind the box frame body.

[0016] Guiding frames for accurately positioning the ladle on the pressure-bearing head are installed at both ends of the above-mentioned box frame body. A first installation cavity for installing the high-temperature resistant load cell and a second installation cavity for laying lines are partitioned in the box frame body. The first installation cavity is equipped with a first detection window, and the second installation cavity is provided with a second detection window.

[0017] Compared with the prior art, the present invention is equipped with a weighing compensation argon supply device on the weighing box body. The weighing compensation argon supply device is a separate metering component assembled from the lower part of the argon blowing device, a weighing accessory, and a compensation weighing sensor. In this way, when the ladle is seated and weighed, and the upper and lower parts of the argon blowing device are hermetically docked, the compensation weighing sensor can separately measure the component force generated by the connection of the argon blowing device, thereby avoiding the influence of the component force generated by the connection of the traditional argon blowing device on the weighing accuracy of the ladle. When weighing the ladle in the present invention, the ladle is directly seated on the pressure head, and the pressure head is directly installed on the high-temperature resistant weighing sensor. In this way, the gravity of the pressure head can directly act on the high-temperature resistant weighing sensor, further ensuring the accuracy of the electronic scale weighing.

[0018] The structure of the present invention is simple, easy to maintain, and can detect the component force generated by the docking of the argon blowing device, and achieve on-line accurate metering of the ladle through component force compensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is Figure 1 the top view structure diagram of

[0021] Figure 3 is Figure 1 the sectional view taken along the line A-A in

[0022] Figure 4 is Figure 1 the sectional view taken along the line B-B in

[0023] Figure 5 is a schematic structural diagram of the weighing box body of the present invention;

[0024] Figure 6 is Figure 5 the top view of

[0025] Figure 7 is Figure 5 the bottom view of

[0026] Figure 8 is Figure 5 the sectional view taken along the line C-C in

[0027] Figure 9 is Figure 5 the sectional view taken along the line D-D in

[0028] Figure 10 is Figure 5 the sectional view taken along the line E-E in

[0029] Figure 11It is a schematic structural diagram of the argon supply device with weighing compensation according to the present invention;

[0030] Figure 12 It is a schematic structural diagram of the compensation weighing sensor according to the present invention;

[0031] Figure 13 It is Figure 12 the top view of;

[0032] Figure 14 It is a schematic structural diagram of the weighing accessory according to the present invention;

[0033] Figure 15 It is Figure 14 the sectional view along the F-F direction in;

[0034] Figure 16 It is Figure 14 the sectional view along the G-G direction in;

[0035] Figure 17 It is a schematic structural diagram of the lower part of the argon blowing device according to the present invention;

[0036] Figure 18 It is Figure 17 the top view of. Specific embodiments

[0037] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0038] Figures 1 to 18 It is a schematic structural diagram of the present invention.

[0039] The reference numerals therein are: joint card cavity I, first installation cavity II, second installation cavity III, weighing box body 1, box base 11, box frame body 12, inclined slag guiding surface 12a, pressure head guiding hole 12b, frame top plate 121, installation frame plate 122, sensor bottom plate 123, heat insulation plate 13, guiding frame 14, first detection window 15, second detection window 16, high-temperature weighing sensor 2, pressure head 3, weighing compensation argon supply device 4, lower part of argon blowing device 41, ventilation hole 41a, positioning concave cavity 41b, lower joint 411, disc spring 412, flange plate 413, sealing ring 414, connecting pipe 415, spring guide post 416, weighing accessory 42, central through hole 42a, spring cavity 42b, counterbore 42c, flange screw hole 42d, nested cavity 42e, compensation weighing sensor 43, gas pipe through hole 43a, accessory screw hole 43b, assembly hole 43c, circular weighing pan 431, circular base 432, compensation weighing signal wire 433, copper adjustment gasket 44, argon supply pipe 5, high-temperature buffer sleeve 6, annular gland 7, steel slag diversion frame 8, sensor base 9.

[0040] In the steel smelting process, the argon blowing process is carried out while the ladle is seated on the weighing scale online. The argon supply for the argon blowing process adopts automatic docking, that is, the weight of the ladle is used to seal and dock the upper part of the argon blowing device installed on the ladle and the lower part of the argon blowing device installed on the weighing box. Since the sealed docking of the argon blowing device will inevitably share part of the weight of the ladle, it will affect the accuracy of the ladle weighing online. Therefore, the present invention discloses a box-type ladle electronic scale with a weighing compensation argon supply device, which can not only meet the requirements of the argon blowing process for secondary refining outside the furnace, but also detect the component force generated after the docking of the argon blowing device, and achieve accurate online weighing of the ladle through component force compensation.

[0041] The box-type ladle electronic scale of the present invention includes a weighing box body 1 with a semi-sealed frame structure. Two high-temperature weighing sensors 2 for weighing and measuring the ladle are symmetrically installed on the left and right in the weighing box body 1. A pressure head 3 matching the support of the ladle is fixedly installed on the high-temperature weighing sensor 2, and the ladle is directly seated on the pressure head 3 during weighing. The pressure head 3 can directly apply and transmit the gravity of the ladle it bears to the high-temperature weighing sensor 2. Since the weight of the ladle can directly act on the high-temperature weighing sensor 2 through the pressure head 3, the accuracy of the electronic scale weighing can be guaranteed to the greatest extent. The high-temperature weighing sensor 2 is connected with a data acquisition line, and the weighing data collected by the high-temperature weighing sensor 2 can be output separately through the data acquisition line. A weighing compensation argon supply device 4 capable of independently collecting the weight borne during the sealed docking of the argon blowing device is also provided on the weighing box body 1 of the present invention. The weighing compensation argon supply device 4 is a separate measuring component assembled by the lower part 41 of the argon blowing device, a weighing accessory 42, and a compensation weighing sensor 43. The lower part 41 of the argon blowing device is connected with an argon supply pipe 5, and the lower part 41 of the argon blowing device realizes the sealed docking of the argon supply path with the upper part of the argon blowing device installed on the ladle in a displacement elastic compensation contact manner during the weighing of the ladle seating. The weighing compensation argon supply device 4 of the present invention is a separate measuring component, which can independently collect the component force generated by the sealed connection of the argon blowing device. Through independent collection, it can be obtained how much weight of the ladle is shared due to the sealed connection of the argon blowing device. In this way, the weighing accuracy of the ladle can be guaranteed through weighing compensation. The ladle electronic scale of the present invention adopts two independent weight signal collections, can be independently displayed and superimposed and displayed, which is clear and obvious.

[0042] In the embodiment, such as Figure 17 and Figure 18As shown in the figure, the lower part 41 of the argon blowing device of the present invention includes a lower joint 411 for sealingly docking with the upper part of the argon blowing device, eight disc springs 412 arranged at equal arcs on the bottom surface of the lower joint 411 for providing elastic compensation for the lower joint 411, and a flange 413 for assembling the lower joint 411 on the weighing accessory 42. When the ladle is seated, the upper part of the argon blowing device presses down the lower joint 411, which can force the lower joint 411 to move downward to compress the disc springs 412. The elastic force of the disc springs 412 on the lower joint 411 can make the lower joint 411 always tightly press the upper part of the argon blowing device upward, thus ensuring the sealing performance when the two are in contact. The flange 413 is fixedly connected to the weighing accessory 42 through bolts. The lower part of the lower joint 411 is slidably arranged in the joint clamping cavity I formed by the flange 413 in a non-disengaging manner. The upper part of the lower joint 411 extends out of the joint clamping cavity I, and a sealing ring 414 for sealing is installed on the top surface of the lower joint 411.

[0043] In the embodiment, a ventilation hole 41a is formed through the center of the top surface of the lower joint 411 of the present invention. A connecting pipe 415 convenient for connecting with the argon supply pipe 5 is welded to the bottom opening of the ventilation hole 41a. The upper opening of the ventilation hole 41a is reamed to form a positioning concave cavity 41b into which the upper joint of the upper part of the argon blowing device can be positioned and inserted. Eight spring guide posts 416 are fixedly installed on the bottom surface of the lower joint 411. The disc springs 412 are sleeved on the above-mentioned spring guide posts 416. The spring guide posts 416 can prevent the disc springs 412 from laterally shifting and facilitate the positioning and installation of the disc springs 412. The specific structure of the upper part of the argon blowing device is not shown in each figure of the present invention. The upper part of the argon blowing device can be a pressing plate with an upper joint. The upper joint has air holes for docking with the ventilation hole 41a. The outer shape of the upper joint is adapted to the positioning concave cavity 41b. The pressing plate also has an annular sealing surface that is sealingly press-fitted with the sealing ring 414.

[0044] In the embodiment, as Figures 14 to 16 shown, a central through hole 42a is formed in the center of the weighing accessory 42 of the present invention. The central through hole 42a is used for the argon supply pipe 5 to pass through for docking with the connecting pipe 415. Eight spring cavities 42b for accommodating the disc springs 412, eight counterbore holes 42c for passing bolts to fixedly install the weighing accessory 42 on the compensation weighing sensor 43, and four flange screw holes 42d for helically mating with the bolts of the mounting flange 413 are formed on the weighing accessory 42. The eight counterbore holes 42c and the eight spring cavities 42b are circumferentially and alternately arranged on the weighing accessory 42. The lower end of the disc spring 412 abuts and cooperates with the annular step surface in the spring cavity 42b, and the upper end of the disc spring 412 presses against the bottom surface of the lower joint 411.

[0045] In the embodiment, as Figure 12 and Figure 13As shown in the figure, the compensation weighing sensor 43 of the present invention is a circular plate weighing sensor with an air pipe through hole 43a formed in the center. The circular plate weighing sensor has a compact structure, a low installation height, and strong impact resistance. The air pipe through hole 43a of the compensation weighing sensor 43 is used for the argon supply pipe 5 to pass through. On the circular weighing plate 431 of the compensation weighing sensor 43, eight accessory screw holes 43b that are helically engaged with the bolts for installing the weighing accessory 42 are formed corresponding to the counterbore holes 42c of the weighing accessory 42. The bottom surface of the weighing accessory 42 is formed with a nested cavity 42e that is positioned and nested with the circular weighing plate 431. The upper end of the circular weighing plate 431 is positioned and nested in the nested cavity 42e, and a copper adjustment gasket 44 for maintaining balance is provided in the nested cavity 42e. Six assembly holes 43c are formed on the circular base 432 of the compensation weighing sensor 43, and a compensation weighing signal wire 433 for uploading the weighing data detected by the compensation weighing sensor 43 is led out from the bottom surface of the circular base 432.

[0046] In the embodiment, as Figures 5 to 10 shown, the weighing box body 1 is composed of a box base 11 and a box frame body 12 welded and installed on the box base 11; a sensor base 9 is fixedly installed on the box base 11, and the high-temperature resistant weighing sensor 2 is fixedly installed on the sensor base 9 through the first bolt. The lower end of the pressure-bearing head 3 is press-fitted on the high-temperature resistant weighing sensor 2, and the upper end of the pressure-bearing head 3 slidably passes through the frame top plate 121 of the box frame body 12. A pressure-bearing head guide hole 12b for the pressure-bearing head 3 to pass through is formed on the frame top plate 121 of the box frame body 12.

[0047] In order to ensure the stability of the pressure-bearing head 3, a high-temperature resistant buffer sleeve 6 that is slidably sleeved with the pressure-bearing head 3 is installed in the pressure-bearing head guide hole 12b, and an annular pressing cover 7 for preventing falling steel slag from entering the pressure-bearing head guide hole 12b is installed at the upper opening of the pressure-bearing head guide hole 12b. The pressure-bearing head 3 slidably passes through the central sliding hole of the annular pressing cover 7.

[0048] In the embodiment, an installation frame plate 122 for installing the weighing compensation argon supply device 4 is provided on the box frame body 12, and a sensor bottom plate 123 is welded on the installation frame plate 122. Sensor screw holes are formed on the sensor bottom plate 123, and the weighing compensation argon supply device 4 is installed on the sensor bottom plate 123 through bolts passing through the assembly holes 43c of the compensation weighing sensor 43. In order to prevent the compensation weighing signal wire 433 and the argon supply pipe 5 from being burned and damaged, both the compensation weighing signal wire 433 and the argon supply pipe 5 are arranged in a concealed manner. Air pipe through holes and signal wire through holes are opened on both the installation frame plate 122 and the sensor bottom plate 123. The air pipe through hole is used for the argon supply pipe 5 to pass through the box frame body 12 and be connected to the connecting pipe 415 of the weighing compensation argon supply device 4. The signal wire through hole is used for the compensation weighing signal wire 433 to pass through.

[0049] In the embodiment, in order to enable the fallen steel slag to roll off the top plate 121 of the frame and prevent it from accumulating on the top plate 121 of the frame, ensuring the cleanliness of the weighing box body 1 and avoiding affecting weighing, the top surface of the top plate 121 is designed as an inclined slag guiding surface 12a with a downward slope, and Figure 3 and Figure 4 As can be clearly seen, a steel slag guiding frame 8 for guiding the rolled-down steel slag is provided in the front of the box frame body 12. In order to prevent the instantaneous heat radiation of the ladle to the weighing sensor and improve the service life of the weighing sensor, a heat insulation plate 13 for heat radiation prevention is also provided at the rear of the box frame body 12.

[0050] Guiding frames 14 for accurately positioning the ladle on the pressure head 3 are installed at both ends of the box frame body 12 of the present invention. A first installation cavity Ⅱ for installing the high-temperature resistant weighing sensor 2 and a second installation cavity Ⅲ for laying wires are formed by partitioning in the box frame body 12. The first installation cavity Ⅱ is equipped with a first detection window 15, and the second installation cavity Ⅲ is provided with a second detection window 16. The setting of the detection window facilitates maintenance, repair or debugging. Usually, covering the detection window can prevent dust, dirt, etc. from entering the weighing box body 1.

[0051] The weighing box body of the present invention adopts a semi-sealed frame structure, which is convenient for installation and maintenance. The introduction of the weighing compensation argon supply device solves the influence of the component force generated by the contact between the upper and lower parts of the traditional automatic argon blowing device on the weighing accuracy of the ladle. The weighing data is collected independently in two ways, displayed independently and displayed in an overlay manner to ensure the weighing accuracy. The weight of the ladle can directly act on the high-temperature resistant weighing sensor through the pressure head, ensuring the accuracy of the electronic scale weighing. The weighing box body is designed with an inclined slag guiding surface, which can reduce the accumulation of steel slag on the box body. The additional steel slag guiding frame can play a role in guiding the slag, reducing the accumulation of steel slag around the electronic scale box body, and facilitating maintenance and repair. The anti-radiation heat insulation plate is designed into the weighing box body, which can prevent the instantaneous heat radiation of the ladle to the weighing sensor and improve the service life of the weighing sensor.

[0052] The best embodiment of the present invention has been illustrated, and various changes or modifications made by those of ordinary skill in the art will not depart from the scope of the present invention.

Claims

1. A box-type ladle electronic scale with a weighing compensation argon supply device, comprising a weighing box body (1) with a semi-sealed frame structure, and two high-temperature resistant weighing sensors (2) for weighing and measuring the ladle are symmetrically installed on the left and right in the weighing box body (1), and the features are as follows: A pressure-bearing head (3) for cooperating with the support of the ladle is fixedly installed on the high-temperature weighing sensor (2). The pressure-bearing head (3) directly applies the gravity of the ladle it bears to the high-temperature weighing sensor (2). A weighing compensation argon supply device (4) for independently collecting the weight received by the sealed connection of the argon blowing device is provided on the weighing box body (1). The weighing compensation argon supply device (4) is a separate metering component assembled by the lower part (41) of the argon blowing device, a weighing accessory (42), and a compensation weighing sensor (43). The lower part (41) of the argon blowing device is connected to an argon supply pipe (5). When weighing the ladle in the seated position, the lower part (41) of the argon blowing device realizes the sealed connection of the argon supply path with the upper part of the argon blowing device installed on the ladle in a way of displacement elastic force compensation contact. The weighing compensation argon supply device (4) can independently collect the component force generated by the sealed connection of the argon blowing device. By independent collection, it can obtain how much weight of the ladle is shared by the sealed connection of the argon blowing device. The box-type ladle electronic scale adopts two-way independent collection of weight signals and can display independently and superimposed display.

2. The electronic scale for box-type ladle with a weighing compensation argon supply device according to claim 1, characterized in that: The lower part (41) of the argon blowing device includes a lower joint (411) for sealingly docking with the upper part of the argon blowing device, eight disc springs (412) arranged at equal arcs on the bottom surface of the lower joint (411) for providing elastic force compensation for the lower joint (411), and a flange (413) for assembling the lower joint (411) on the weighing accessory (42). The flange (413) is fixedly connected to the weighing accessory (42) by bolts. The lower part of the lower joint (411) is slidably arranged in a joint clamping cavity (Ⅰ) formed by the flange (413) in a way of preventing detachment. The upper part of the lower joint (411) extends out of the joint clamping cavity (Ⅰ), and a sealing ring (414) for sealing is installed on the top surface of the lower joint (411).

3. A box-type ladle electronic scale with a weighing compensation argon supply device according to claim 2, characterized in that: A ventilation hole (41a) is formed through the center of the top surface of the lower joint (411) downward. A connecting pipe (415) convenient for connecting with the argon supply pipe (5) is welded to the bottom opening of the ventilation hole (41a). The upper opening of the ventilation hole (41a) is reamed to form a positioning concave cavity (41b) into which the upper joint of the upper part of the argon blowing device can be positioned and clamped. Eight spring guide posts (416) are fixedly installed on the bottom surface of the lower joint (411). The disc springs (412) are sleeved on the above-mentioned spring guide posts (416).

4. The box-type ladle electronic scale with a weighing compensation argon supply device according to claim 3, characterized in that: The central portion of the described weighing attachment (42) is formed with a central through-hole (42a) for the argon supply pipe (5) to pass through, and eight spring cavities (42b) for accommodating the disc springs (412), eight counterbore holes (42c) for passing bolts to fixedly mount the weighing attachment (42) onto the compensating load cell (43), and four flange screw holes (42d) for screw-threading engagement with the bolts of the mounting flange (413) are formed on the weighing attachment (42); the eight counterbore holes (42c) and the eight spring cavities (42b) are circumferentially arranged alternately on the weighing attachment (42). The lower end of the disc spring (412) abuts and cooperates with the annular step surface in the spring cavity (42b), and the upper end of the disc spring (412) presses against the bottom surface of the lower joint (411).

5. A box-type ladle electronic scale with a weighing compensation argon supply device according to claim 4, characterized in that: The described compensating load cell (43) is a circular plate type load cell with a gas pipe through-hole (43a) formed in the center. Eight accessory screw holes (43b) for screw-threading engagement with the bolts for mounting the weighing attachment (42) are formed on the circular weighing plate (431) of the compensating load cell (43) corresponding to the counterbore holes (42c) of the weighing attachment (42), and a nesting cavity (42e) for positioning and nested cooperation with the circular weighing plate (431) is formed on the bottom surface of the weighing attachment (42). A copper adjusting shim (44) for maintaining balance is provided in the nesting cavity (42e); six assembly holes (43c) are formed on the circular base (432) of the compensating load cell (43), and a compensating weighing signal wire (433) for uploading the weighing data detected by the compensating load cell (43) is led out from the bottom surface of the circular base (432).

6. The box-type ladle electronic scale with a weighing compensation argon supply device according to claim 5, characterized in that: The described weighing box body (1) is composed of a box base (11) and a box frame body (12) welded and installed on the box base (11); a sensor base (9) is fixedly installed on the box base (11), the high-temperature resistant load cell (2) is fixedly installed on the sensor base (9) by a first bolt, the lower end of the pressure-bearing head (3) is press-fitted on the high-temperature resistant load cell (2), the upper end of the pressure-bearing head (3) slidably passes through the frame top plate (121) of the box frame body (12), and a pressure-bearing head guiding hole (12b) for the pressure-bearing head (3) to pass through is formed on the frame top plate (121) of the box frame body (12).

7. The box-type ladle electronic scale with a weighing compensation argon supply device according to claim 6, characterized in that: A high-temperature resistant buffer sleeve (6) slidably sleeved with the pressure-bearing head (3) is installed in the pressure-bearing head guiding hole (12b), an annular gland (7) for preventing falling steel slag from entering the pressure-bearing head guiding hole (12b) is installed at the upper opening of the pressure-bearing head guiding hole (12b), and the pressure-bearing head (3) slidably passes through the central sliding hole of the annular gland (7).

8. The electronic scale for box-type molten steel ladle with a weighing compensation argon supply device according to claim 7, characterized in that: An installation frame plate (122) for installing a weighing compensation argon supply device (4) is provided on the described box frame body (12). A sensor bottom plate (123) is welded on the installation frame plate (122). Sensor screw holes are formed on the sensor bottom plate (123). The weighing compensation argon supply device (4) is installed on the sensor bottom plate (123) through bolts passing through the assembly holes (43c) of the compensation weighing sensor (43). Gas pipe through holes for the argon supply pipe (5) to pass through and signal line through holes for the compensation weighing signal line (433) to pass through are formed on both the installation frame plate (122) and the sensor bottom plate (123).

9. A box-type ladle electronic scale with a weighing compensation argon supply device according to claim 8, characterized in that: An inclined slag guiding surface (12a) capable of making the fallen steel slag roll off the top plate (121) is formed on the top surface of the described top plate (121). And a steel slag guiding frame (8) for guiding the rolled-down steel slag out is provided in front of the box frame body (12). A heat insulation plate (13) for preventing heat radiation is arranged behind the box frame body (12).

10. The box-type ladle electronic scale with a weighing compensation argon supply device according to claim 8, characterized in that: Guide frames (14) for accurately positioning the ladle on the pressure head (3) are installed at both ends of the described box frame body (12). A first installation cavity (Ⅱ) for installing a high-temperature resistant weighing sensor (2) and a second installation cavity (Ⅲ) for laying lines are partitioned in the box frame body (12). A first detection window (15) is equipped in the first installation cavity (Ⅱ), and a second detection window (16) is provided in the second installation cavity (Ⅲ).

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