A feeding device for producing ferro-silicon nitride

Abstract

The application discloses a feeding device for ferro-silicon nitride production and relates to the technical field of chemical equipment.The feeding device comprises a feeding assembly, a stabilizing tank, two cover plates and a control component.The stabilizing tank is circumferentially divided into three mutually separated chambers.The cover plates are rotationally connected with the stabilizing tank, and the two cover plates can be combined at the discharge ports of two chambers of the stabilizing tank.The control component is configured to drive any one of the cover plates to rotate, and the control component can only drive one cover plate to rotate at the same time.In the three chambers of the stabilizing tank, one chamber is configured to be filled with a certain amount of raw materials, one chamber is configured to be filled with the raw materials transported by the feeding assembly, and one chamber is configured to be empty of the raw materials.The feeding device for ferro-silicon nitride production can continuously and quantitatively feed materials, can ensure heat-source-free continuous production, and can improve the quality of ferro-silicon nitride products.

Description

Technical Field

[0001] This application relates to the field of chemical equipment technology, and in particular to a feeding device for the production of silicon nitride iron. Background Technology

[0002] Ferrosilicon nitride is a mixture with Si3N4 as the main component, accompanied by free iron, un-ferrosilicon nitride, and small amounts of other components. It is primarily used in the plugging mud of large blast furnaces to improve the plugging performance. In its production, ferrosilicon nitride is typically produced by crushing lumpy ferrosilicon into powder using a crusher and grinding it in a ball mill. This powder is then fed into a nitriding furnace via a feeding device, and nitrogen gas is introduced into the furnace. The powder and nitrogen react at high temperatures to produce the finished ferrosilicon nitride. The reaction between the powder and nitrogen is exothermic, allowing for continuous, heat-free production of subsequent reactions.

[0003] While existing feeding devices can supply materials to the nitriding furnace, intermittent or irregular feeding can occur, causing temperature fluctuations within the furnace. This is detrimental to the continuous heatless production of silicon nitride and affects the quality of the final silicon nitride product. Summary of the Invention

[0004] In order to improve the problem that the feeding device in the prior art may feed material into the nitriding furnace intermittently or indefinitely, which causes temperature fluctuations in the nitriding furnace, is not conducive to the continuous production of silicon nitride without a heat source and affects the quality of the final silicon nitride product, this application provides a feeding device for silicon nitride production that can continuously and quantitatively feed material into the nitriding furnace.

[0005] This application provides a feeding device for the production of silicon nitride iron, which adopts the following technical solution:

[0006] A feeding device for the production of silicon nitride iron includes:

[0007] A material conveying assembly configured to transport raw materials;

[0008] The material stabilizing box is cylindrical and is divided into three mutually separated chambers along the circumference. Both ends of the material stabilizing box are open, and the two ends of the open ends are respectively set as the inlet and outlet of the three chambers. The inlet is connected to the material conveying assembly, and the outlet is connected to the nitriding furnace.

[0009] Two cover plates are rotatably connected to the material stabilizing box, and the two cover plates can cover the discharge ports of two of the chambers of the material stabilizing box.

[0010] A control component is connected to the material stabilizing box. The control component is configured to drive any one of the cover plates to rotate, and the control component can only drive one cover plate to rotate at a time.

[0011] In this material hopper, one of the three chambers is configured to be filled with a fixed amount of raw material, one chamber is configured to be filled with raw material being transported by the conveying assembly, and one chamber is configured to be empty of raw material.

[0012] In a preferred embodiment of this application, the control element includes:

[0013] A control shaft, which is rotatably mounted on the axis of the material stabilizer box;

[0014] A control frame, wherein one end of the control shaft is connected to the control frame;

[0015] Three control cylinders are provided. The fixed end of each control cylinder is connected to the control frame, and the movable end of each control cylinder extends out and can connect to the cover plate. The three control cylinders are respectively set to correspond to the three chambers of the material stabilizing box, and at any given time only the movable end of one control cylinder is connected to one of the cover plates.

[0016] A control motor is mounted on the material stabilizing box and is configured to drive the control shaft to rotate.

[0017] In a preferred embodiment of this application, a control hole is provided on the cover plate, and the movable end of the control cylinder extends out and is embedded in the control hole.

[0018] In a preferred embodiment of this application, the feeding assembly includes:

[0019] A feeding belt configured to convey raw materials;

[0020] A buffer box, which is a hollow chamber open at both ends, is configured to transfer and store the raw materials conveyed on the feeder belt;

[0021] A feeding pipe, one end of which is connected to the bottom of the buffer box, and the other end of which faces the stabilizing box and feeds into one of the chambers of the stabilizing box.

[0022] In a preferred embodiment of this application, the conveying pipe is a flexible hose, which is rotatably connected to the bottom end of the buffer box, and the rotation axis of the conveying pipe and the buffer box coincides with the axis of the stabilizing box.

[0023] In a preferred embodiment of this application, the feeding assembly further includes:

[0024] A material conveyor frame, one end of which is connected to the material conveying pipe;

[0025] A material conveying motor is mounted on the material stabilizing box, and the axis of the material conveying motor coincides with the axis of the material stabilizing box. The other end of the material conveying frame is connected to the output end of the material conveying motor.

[0026] In a preferred embodiment of this application, the feeding rack includes a feeding plate and a support bar connected to each other, and the feeding pipe passes through both the feeding plate and the support bar. The support bar is a flexible and shape-fixed hose.

[0027] In a preferred embodiment of this application, three sets of stirring components are further included, each set of stirring components being disposed in one of the three chambers of the material stabilizing tank. Each stirring component includes:

[0028] A stirring base, which is connected to the material stabilizing box;

[0029] A stirring motor, which is connected to the stirring base;

[0030] A stirring shaft, which is connected to the stirring motor;

[0031] A stirring impeller, which is connected to the stirring shaft.

[0032] In a preferred embodiment of this application, a discharge hood is further included, one end of which covers the discharge port of the material stabilizing box, and the other end of which is connected to the nitriding furnace.

[0033] In a preferred embodiment of this application, a sliding groove is provided on the end of the material stabilizing box along the circumference of the material stabilizing box, and a slider is provided on the cover plate, the slider being slidably embedded in the sliding groove.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] The feeding device for silicon nitride production described in this application includes a conveying assembly, a material stabilizing box, two cover plates, and a control unit. The material stabilizing box is divided into three mutually separated chambers along the circumferential direction. The cover plates are rotatably connected to the material stabilizing box, and the two cover plates can close at the discharge ports of two of the chambers of the material stabilizing box. The control unit is configured to drive any one of the cover plates to rotate, and the control unit can only drive one cover plate to rotate at a time. Among the three chambers of the material stabilizing box, one chamber is configured to be filled with a certain amount of raw material, one chamber is configured to be filled with raw material by the conveying assembly, and one chamber is configured to be empty of raw material. When the aforementioned feeding device for silicon nitride production is in use, one chamber in the material stabilizing box is always feeding a fixed amount of material into the nitriding furnace, and another chamber is filling a fixed amount of raw material. Even if there is an interruption in the feeding assembly, the chamber that is filling the raw material can act as a buffer until it is filled with a fixed amount of raw material before feeding. This avoids the impact of interrupted or irregular feeding, keeps the temperature inside the nitriding furnace stable, ensures continuous production of silicon nitride without a heat source, promotes complete reaction of raw materials, and improves the quality of the final silicon nitride product. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the feeding device for producing silicon nitride iron in a preferred embodiment of this application;

[0037] Figure 2 yes Figure 1 The diagram shows the structure of the material stabilizing box in the feeding device for silicon nitride production;

[0038] Figure 3 yes Figure 1 The diagram shows the fitting relationship between the first plate covering the discharge port of the first chamber and the second plate covering the discharge port of the second chamber in the feeding device for silicon nitride production.

[0039] Figure 4 yes Figure 1 The diagram shows the fitting relationship between the first plate covering the outlet of the third chamber and the second plate covering the outlet of the second chamber in the feeding device for silicon nitride production.

[0040] Figure 5 yes Figure 1 The diagram shows the fitting relationship between the first plate covering the outlet of the third chamber and the second plate covering the outlet of the first chamber in the feeding device for silicon nitride production.

[0041] Figure 6 yes Figure 1 The diagram shows the fitting relationship between the first plate covering the outlet of the second chamber and the second plate covering the outlet of the first chamber in the feeding device for silicon nitride production.

[0042] Figure 7yes Figure 1 The diagram shows a structural schematic of the material stabilizing box in the feeding device for silicon nitride production from another perspective.

[0043] Explanation of reference numerals in the attached drawings: 1. Conveying assembly; 11. Feeding belt; 12. Buffer box; 13. Conveying pipe; 14. Conveying frame; 141. Conveying plate; 142. Support bar; 15. Conveying motor; 2. Material stabilizing box; 21. Chamber; 211. First chamber; 212. Second chamber; 213. Third chamber; 22. Feed inlet; 23. Feed inlet; 24. Slide chute; 3. Cover plate; 31. First plate; 32. Second plate; 33. Control hole; 4. Control component; 41. Control shaft; 42. Control frame; 43. Control cylinder; 44. Control motor; 5. Mixing assembly; 51. Mixing seat; 52. Mixing motor; 53. Mixing shaft; 54. Mixing impeller; 6. Discharge hood. Detailed Implementation

[0044] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0045] This application discloses a feeding device for the production of silicon nitride iron, comprising:

[0046] Material conveying assembly 1 is configured to transport raw materials;

[0047] The material stabilizing box 2 is cylindrical. The material stabilizing box 2 is divided into three mutually separated chambers 21 along the circumference. The material stabilizing box 2 is open at both ends. The two ends of the open end are respectively set as the feed inlet 22 and the discharge outlet 23 of the three chambers 21. The feed inlet 22 is connected to the material conveying component 1, and the discharge outlet 23 is connected to the nitriding furnace.

[0048] Two cover plates 3 are rotatably connected to the material stabilizing box 2, and the two cover plates 3 can cover the discharge port 23 of two of the chambers 21 of the material stabilizing box 2.

[0049] Control component 4 is connected to the material stabilizing box 2. The control component 4 is configured to drive any one of the cover plates 3 to rotate, and the control component 4 can only drive one cover plate 3 to rotate at the same time.

[0050] Among them, one of the three chambers 21 of the material stabilizing box 2 is configured to be filled with a certain amount of raw material, one chamber is configured to be transported by the conveying assembly 1 to fill the raw material, and one chamber is configured to be empty of raw material.

[0051] When the aforementioned feeding device for silicon nitride production is in use, one chamber in the material stabilizing box 2 is always feeding a fixed amount of material into the nitriding furnace, and another chamber is filling a fixed amount of raw material. Even if there is an interruption in the feeding component 1, the chamber 21 that is filling the raw material can act as a buffer until it is filled with a fixed amount of raw material before feeding. This avoids the impact of interrupted or irregular feeding, keeps the temperature inside the nitriding furnace stable, ensures continuous production of silicon nitride without a heat source, promotes complete reaction of raw materials, and improves the quality of the final silicon nitride product.

[0052] In this embodiment, refer to Figures 3 to 6 As shown, specifically, for ease of understanding, the three chambers 21 in the material stabilizing box 2 are respectively labeled as the first chamber 211, the second chamber 212 and the third chamber 213, and the two cover plates 3 are respectively labeled as the first plate 31 and the second plate 32.

[0053] Reference Figure 3 and Figure 4 As shown, in the initial state, the first plate 31 and the second plate 32 respectively cover the discharge ports 23 of the first chamber 211 and the second chamber 212, while the third chamber 213 is not covered. The first chamber 211 is filled with a fixed amount of raw material, and the second chamber 212 is being fed by the feeding assembly 1. Subsequently, the control unit 4 drives the first plate 31 to rotate, and the first plate 31 moves towards the discharge port 23 of the third chamber 213. The discharge port 23 of the first chamber 211 gradually opens, and the raw material in the first chamber 211 is gradually discharged into the nitriding furnace. While discharging material from the first chamber 211, the conveying assembly 1 feeds material into the second chamber 212 until a predetermined amount is reached. When the material in the first chamber 211 is completely discharged, the second chamber 212 is already filled with a fixed amount of material. At this time, the first plate 31 moves to cover the outlet 23 of the third chamber 213. Preferably, the conveying speed of the conveying assembly 1 or the opening speed of the first plate 31 can be controlled to ensure that when the first chamber 211 is completely discharged, the second chamber 212 is already filled with a fixed amount of material, thereby avoiding the adverse effects of intermittent material conveying.

[0054] Reference Figure 4 and Figure 5 As shown, subsequently, the control component 4 disengages from the control of the first plate 31 and begins to control the second plate 32 to rotate toward the position of the first cavity 211. The discharge port 23 of the second cavity 212 gradually opens, and the raw material in the second cavity 212 is gradually discharged into the nitriding furnace. While the second cavity 212 is discharging material, the material conveying component 1 feeds material into the third cavity 213 until the predetermined amount is reached. When the raw material in the second cavity 212 is completely discharged, the third cavity 213 has been filled with a fixed amount of raw material. At this time, the second plate 32 moves to close and covers the discharge port 23 of the first cavity 211.

[0055] Reference Figure 5 and Figure 6As shown, subsequently, the control component 4 disengages from the control of the second plate 32 and begins to control the first plate 31 to rotate towards the position of the second cavity 212. The discharge port 23 of the third cavity 213 gradually opens, and the raw material in the third cavity 213 is gradually discharged into the nitriding furnace. While the third cavity 213 is discharging material, the feeding component 1 feeds material into the first cavity 211 until the predetermined amount is reached. When the raw material in the third cavity 213 is completely discharged, the first cavity 211 has been filled with a fixed amount of raw material. At this time, the first plate 31 moves to cover the discharge port 23 of the second cavity 212, and the first cavity 211 is filled with a fixed amount of raw material ready to be discharged. The second cavity 212 is being fed by the feeding component 1, thus completing one fixed feeding cycle. Subsequently, the control component 4 continues to control the opening and closing of the cover plate 3 in a cycle, thereby realizing continuous and fixed feeding operation.

[0056] In this embodiment, refer to Figure 7 As shown, preferably, the control element 4 includes:

[0057] Control shaft 41 is rotatably mounted on the axis of the material stabilizer box 2;

[0058] Control frame 42, one end of control frame 42 is connected to control shaft 41;

[0059] Three control cylinders 43 are provided. The fixed end of the control cylinder 43 is connected to the control frame 42, and the movable end of the control cylinder 43 can be connected to the cover plate 3 after it extends out. The three control cylinders 43 are respectively set to correspond to the three chambers 21 of the material stabilizing box 2, and at the same time only the movable end of one control cylinder 43 is connected to one cover plate 3.

[0060] A control motor 44 is mounted on the material stabilizing box 2 and is configured to drive the control shaft 41 to rotate.

[0061] The control motor 44 drives the control shaft 41 and the control frame 42, which in turn drives three sets of control cylinders 43 to rotate around the axis of the material stabilizing box 2. During rotation, the movable end of one of the control cylinders 43 extends and connects to a cover plate 3, thereby driving the cover plate 3 to open and allowing the raw material in the corresponding chamber 21 to enter the nitriding furnace; the other cover plate 3 does not rotate, thereby allowing the material conveying assembly 1 to fill the corresponding chamber 21. The arrangement of three control cylinders 43 greatly improves the flexibility of the control component 4 and ensures stable feeding of raw materials.

[0062] In this embodiment, preferably, the cover plate 3 has a control hole 33, and the movable end of the control cylinder 43 extends out and is embedded in the control hole 33.

[0063] By setting control hole 33, the connection between control cylinder 43 and cover plate 3 is facilitated, and the positioning accuracy is improved. Control hole 33 is not completely through to prevent material leakage. The opening of control hole 33 is chamfered to facilitate the insertion of the movable end of control cylinder 43.

[0064] In this embodiment, refer to Figure 1 As shown, preferably, the feeding assembly 1 includes:

[0065] Feeding belt 11, which is configured to convey raw materials;

[0066] The buffer box 12 is a hollow chamber 21 with openings at both ends. The buffer box 12 is configured to transfer and store the raw materials conveyed on the feeder belt 11.

[0067] The conveying pipe 13 has one end connected to the bottom of the buffer box 12, and the other end of the conveying pipe 13 is directed toward the material stabilizing box 2 and feeds into one of the chambers 21 of the material stabilizing box 2.

[0068] The feeding belt 11 is existing technology and will not be described in detail here. By setting up a buffer box 12, the raw materials are stored in the buffer box 12, avoiding the situation where the feeding belt 11 is interrupted and affects the final feeding. Preferably, the raw materials stored in the buffer box 12 in the initial state are more than the amount that can be filled by the two chambers 21, thereby ensuring that the chambers 21 in the material stabilizing box 2 can always receive continuously filled raw materials.

[0069] In this embodiment, preferably, the conveying pipe 13 is a flexible hose, and the conveying pipe 13 is rotatably connected to the bottom end of the buffer box 12. The rotation axis of the conveying pipe 13 and the buffer box 12 coincides with the axis of the material stabilizing box 2.

[0070] The conveying pipe 13 with the hose can rotate around the axis of the material stabilizing box 2, which facilitates the conveying pipe 13 to fill the three chambers 21 arranged around the periphery of the material stabilizing box 2 in sequence, thereby improving the filling efficiency; and at the same time, it makes the raw materials entering the chambers 21 evenly distributed, avoiding accumulation in the same place.

[0071] In this embodiment, preferably, the feeding assembly 1 further includes:

[0072] Material conveyor 14, one end of which is connected to material conveying pipe 13;

[0073] The material conveying motor 15 is mounted on the material stabilizing box 2, and the axis of the material conveying motor 15 coincides with the axis of the material stabilizing box 2. The other end of the material conveying frame 14 is connected to the output end of the material conveying motor 15.

[0074] By setting up a conveying motor 15, which drives the conveying pipe 13 to rotate around the axis of the material stabilizing box 2 through the transmission of the conveying frame 14, the conveying efficiency is further improved.

[0075] In this embodiment, refer to Figure 2 As shown, preferably, the feeding rack 14 includes a feeding plate 141 and a support bar 142 connected to each other, and the feeding pipe 13 passes through both the feeding plate 141 and the support bar 142. The support bar 142 is a flexible and shape-fixed hose.

[0076] The support bar 142 is set as a flexible and shape-adjustable hose, which makes it convenient for operators to adjust the angle of the outlet of the conveying pipe 13 according to the actual material conveying situation, which is conducive to the uniform distribution of raw materials in the chamber 21.

[0077] In this embodiment, preferably, it further includes three sets of stirring components 5, which are respectively disposed in the three chambers 21 of the material stabilizing box 2. The stirring components 5 include:

[0078] Agitator 51 is connected to material stabilizer 2;

[0079] A stirring motor 52 is connected to a stirring base 51.

[0080] A stirring shaft 53 is connected to a stirring motor 52.

[0081] A stirring impeller 54 is connected to a stirring shaft 53.

[0082] By setting the stirring assembly 5, the stirring motor 52 drives the stirring impeller 54 to rotate in the chamber 21 containing the raw materials, so that the raw materials in the chamber 21 are evenly distributed, which is beneficial to the stability of feeding; and the stirring impeller 54 continuously stirs, so that the raw materials are completely discharged from the chamber 21 after the cover plate 3 is opened, avoiding residue accumulation.

[0083] In this embodiment, refer to Figure 1 As shown, preferably, it also includes a discharge hood 6, one end of which is covered at the discharge port 23 of the material stabilizing box 2, and the other end of which is connected to the nitriding furnace.

[0084] By setting up the discharge hood 6, the raw materials in any chamber 21 of the material stabilizing box 2 can enter the nitriding furnace through the discharge hood 6. Specifically, the discharge hood 6 is a variable diameter pipe structure, and the diameter of the end of the discharge hood 6 connected to the material stabilizing box 2 is much larger than that of the other end, which improves the smooth downward movement of the raw materials and ensures continuous feeding.

[0085] In this embodiment, refer to Figure 7 As shown, preferably, a sliding groove 24 is provided on the end of the material stabilizing box 2 along the circumference of the material stabilizing box 2, and a slider (not shown in the figure) is provided on the cover plate 3, the slider being slidably embedded in the sliding groove 24.

[0086] By setting the slider and the groove 24, the rotation of the cover plate 3 is limited, which improves the reliability of the rotation of the cover plate 3.

[0087] The implementation principle of this application embodiment is as follows: When the feeding device for silicon nitride production is in use, the feeding belt 11 continuously feeds the material into the buffer box 12. The raw material in the buffer box 12 is fed into one of the chambers 21 of the material stabilizing box 2 through the conveying pipe 13. There is always one chamber 21 in the material stabilizing box 2 feeding a quantitative amount of material into the nitriding furnace, and the other chamber 21 is filled with a quantitative amount of raw material, thereby realizing continuous quantitative feeding. The raw material discharged from the material stabilizing box 2 enters the nitriding furnace after passing through the discharge hood 6, thus completing the feeding operation.

[0088] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A feeding device for the production of silicon nitride iron, characterized in that, include: A material conveying assembly configured to transport raw materials; The material stabilizing box is cylindrical and is divided into three mutually separated chambers along the circumference. Both ends of the material stabilizing box are open, and the two ends of the open ends are respectively set as the inlet and outlet of the three chambers. The inlet is connected to the material conveying assembly, and the outlet is connected to the nitriding furnace. Two cover plates are rotatably connected to the material stabilizing box, and the two cover plates can cover the discharge ports of two of the chambers of the material stabilizing box. A control component is connected to the material stabilizing box. The control component is configured to drive any one of the cover plates to rotate, and the control component can only drive one cover plate to rotate at a time. In this material stabilizing box, one of the three chambers is configured to be filled with a fixed amount of raw material, one chamber is configured to be filled with raw material being transported by the conveying assembly, and one chamber is configured to be empty of raw material. The control component includes: A control shaft, which is rotatably mounted on the axis of the material stabilizer box; A control frame, wherein one end of the control shaft is connected to the control frame; Three control cylinders are provided. The fixed end of each control cylinder is connected to the control frame, and the movable end of each control cylinder extends out and can connect to the cover plate. The three control cylinders are respectively set to correspond to the three chambers of the material stabilizing box, and at any given time only the movable end of one control cylinder is connected to one of the cover plates. A control motor is mounted on the material stabilizing box and is configured to drive the control shaft to rotate.

2. The feeding device for producing silicon nitride iron according to claim 1, characterized in that: The cover plate has a control hole, and the movable end of the control cylinder extends out and is embedded in the control hole.

3. The feeding device for producing silicon nitride iron according to claim 1, characterized in that, The material conveying assembly includes: A feeding belt configured to convey raw materials; A buffer box, which is a hollow chamber open at both ends, is configured to transfer and store the raw materials conveyed on the feeder belt; A feeding pipe, one end of which is connected to the bottom of the buffer box, and the other end of which faces the stabilizing box and feeds into one of the chambers of the stabilizing box.

4. The feeding device for producing silicon nitride iron according to claim 3, characterized in that: The conveying pipe is a flexible tube, which is rotatably connected to the bottom of the buffer box, and the rotation axis of the conveying pipe and the buffer box coincides with the axis of the stabilizing box.

5. The feeding device for producing silicon nitride iron according to claim 4, characterized in that: The feeding assembly also includes: A material conveyor frame, one end of which is connected to the material conveying pipe; A material conveying motor is mounted on the material stabilizing box, and the axis of the material conveying motor coincides with the axis of the material stabilizing box. The other end of the material conveying frame is connected to the output end of the material conveying motor.

6. The feeding device for producing silicon nitride iron according to claim 5, characterized in that: The feeding rack includes a feeding plate and a support bar connected to each other. The feeding pipe passes through both the feeding plate and the support bar. The support bar is a flexible and shape-fixed hose.

7. The feeding device for producing silicon nitride iron according to claim 1, characterized in that: It also includes three sets of stirring components, which are respectively arranged in three chambers of the material stabilizing tank. The stirring components include: A stirring base, which is connected to the material stabilizing box; A stirring motor, which is connected to the stirring base; A stirring shaft, which is connected to the stirring motor; A stirring impeller is connected to the stirring shaft.

8. The feeding device for producing silicon nitride iron according to claim 1, characterized in that: It also includes a discharge hood, one end of which covers the discharge port of the material stabilizing box, and the other end of which is connected to the nitriding furnace.

9. The feeding device for producing silicon nitride iron according to claim 1, characterized in that: The end of the material stabilizing box is provided with a sliding groove arranged around the circumference of the material stabilizing box, and a slider is provided on the cover plate, the slider being slidably embedded in the sliding groove.

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