Middle trough with replaceable upper wing plate

Abstract

The invention relates to the technical field of fully-mechanized top coal caving face conveying equipment, in particular to a middle trough with a replaceable upper wing plate, which comprises a middle trough body, the upper wing plate, a connecting bolt and a nut. In the operation process of a scraper conveyor on the rear portion of a fully-mechanized top coal caving working face, the upper wing plate of the middle trough is seriously abraded, according to the split structure of the upper wing plate and the trough body of the middle trough, the upper wing plate can be quite conveniently disassembled and replaced underground when the upper wing plate is seriously abraded, and the original notch section matching size of the middle trough of the scraper conveyor is recovered; the scraper chain can operate normally, smooth conveying of raw coal is achieved, and normal production of a fully-mechanized top coal caving working face is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of conveying equipment for fully mechanized top coal caving faces, specifically to a middle trough with a replaceable upper wing plate. Background Technology

[0002] Coal transportation in underground mines is a crucial part of coal mine production. Scraper conveyors are one of the key pieces of equipment for transporting raw coal in coal mine working faces. The central trough accounts for more than 70% of the total weight of the scraper conveyor, making it the component with the largest usage and consumption.

[0003] The middle trough is welded together from two "Σ"-shaped sidewalls on the left and right, a middle plate, and a bottom plate. The "Σ"-shaped sidewalls have a complex shape and are usually cast. The middle and bottom plates are made of high-strength wear-resistant plates. The upper edge of the "Σ"-shaped sidewalls is used to confine the scraper chain to the upper part of the chute to complete the task of transporting raw coal.

[0004] Due to geological conditions and mining techniques, a certain amount of gangue is inevitably extracted during raw coal mining, especially in fully mechanized top coal caving faces, where gangue content is even more difficult to control. Gangue causes severe wear on the center plate and sides of the central chute, particularly the upper flange. The upper flange of the central chute is relatively narrow and made of cast material, making it prone to wear, thinning, and reduced strength. This increases the size of the chute opening, failing to effectively restrain the scraper, which can easily detach from the opening. This prevents the scraper chain from operating normally, hindering the normal transport of raw coal. Shutdown and repair are necessary, requiring the scraper to be returned to the chute and the flange re-welded to ensure stable operation of the scraper conveyor and maintain normal production at the working face. Poor ventilation underground and the accumulation of flammable and explosive gases make on-site flange repair extremely difficult and dangerous, seriously impacting safe production. Summary of the Invention

[0005] To eliminate the problem of rapid wear of the upper flange causing the scraper to detach from the central trough and the scraper chain to malfunction, it is necessary to provide a scraper conveyor central trough with a replaceable upper flange. By replacing the upper flange, the original trough opening size of the scraper conveyor central trough can be restored. At the same time, the connection between the upper flange and the trough body requires high strength and easy disassembly.

[0006] This invention provides a replaceable upper wing plate for a central groove, comprising a central groove body 1, a replaceable upper wing plate 2, connecting bolts 3a, and nuts 3b. The central groove body 1 has three flanges m at both ends and the center of the upper inner edge of the left groove side 1a and the right groove side 1b, respectively. The left groove side 1a and the right groove side 1b each have two horizontal connecting flanges f. The upper wing plate 2 has steps n corresponding to the bosses m on the upper edges of the left groove side 1a and the right groove side 1b. The length of the replaceable upper wing plate 2 is half the length of the matching central groove body 1. The replaceable upper wing plate 2 has a left-right symmetrical structure and is made of high-strength wear-resistant plate material.

[0007] The upper flange of the scraper conveyor's central trough described in this invention is limited by a flange at the inner opening of the trough side and fixed with bolts, making disassembly and assembly convenient. When wear is severe, it can be directly disassembled and replaced underground. Simultaneously, the replaceable flange length is 1 / 2 the length of the central trough, further reducing weight and simplifying replacement. The upper flange is made of high-strength wear-resistant plate material, further improving its service life. The upper flange of the central trough can be disassembled and replaced on-site underground, restoring the original dimensions of the scraper conveyor's central trough, preventing abnormal situations such as scraper slippage, ensuring the normal operation of the scraper chain, and guaranteeing safe production in coal mines. Attached Figure Description

[0008] Figure 1 A schematic diagram of a mid-groove structure with replaceable upper wing plates. Figure 2 This is a schematic diagram of the upper wing's external dimensions. Figure 3 This is a force diagram of the replaceable upper wing plate during operation. The components are: 1. Central trough body; 1a. Left trough side; 1b. Right trough side; 2. Replaceable upper flange; 3a. Connecting bolt; 3b. Nut; 4. Scraper; 4a. Scraper end; m. Boss on the upper edge of the central trough side; n. Limiting step of the upper flange; f. Trough side connecting flange; e. Upper flange connecting flange; G. Wear surface of the upper flange. Detailed Implementation

[0009] The technical solutions of the present invention will be described in complete and clear form below with reference to the accompanying drawings in the embodiments of the present invention.

[0010] like Figure 1 As shown, a replaceable upper flange of the central groove consists of a central groove body 1, a replaceable upper flange 2, connecting bolts 3a, and nuts 3b. The central groove body 1 has three flanges m at both ends and the center of the upper inner edge of the left groove side 1a and the right groove side 1b. The left groove side 1a and the right groove side 1b each have two horizontal connecting flanges f. The upper flange 2 has steps n corresponding to the flanges m on the upper edges of the left groove side 1a and the right groove side 1b. The upper flange 2 is installed on the connecting flanges f of the groove side 1a and the right groove side 1b, with the connecting holes aligned. The three flanges m on the upper inner edge of the left groove side 1a and the right groove side 1b cooperate with the steps n of the upper flange 2. The flanges m, through the steps n, effectively restrict the upward movement of the upper flange 2. After installing the connecting bolts 3a and nuts 3b, the upper flange 2 is firmly fixed to the central groove body 1.

[0011] like Figure 2 As shown, the upper flange 2 is symmetrical in shape from left to right, and the connecting holes on the upper flange connecting flange e are symmetrically arranged, so that the four upper flanges on the same groove can be used interchangeably, which is convenient for installation and reduces the variety of parts.

[0012] The length of the replaceable upper wing plate 2 is half that of the matching middle groove. The reduced length and weight not only reduce the manufacturing difficulty but also facilitate the handling and disassembly in the narrow working space of the underground coal mining face.

[0013] The replaceable upper wing plate 2 is made of high-strength wear-resistant plate, replacing the original cast groove side, and the wear resistance, strength and other properties of the material are significantly improved.

[0014] like Figure 3 As shown, during the movement of scraper 4 on the middle trough 1, due to the squeezing action of the conveyed material, its scraper end 4a is subjected to a vertical load q1 and an inclined load q2. These loads q1 and q2 are transmitted to the upper flange 2 through the upper edge G of the scraper end 4a, becoming a resultant force Fg. The flange m on the upper edge of the right trough side 1b restricts the movement of the upper flange 2 through the step n on the upper flange 2, thus generating a reaction force Fm. The effect of the resultant force Fg and the reaction force Fm on the upper flange 2 can be considered as two moments with the right contact point D of the upper flange 2 and the trough side connecting flange f as the hinge axis. Figure 3 As shown, the points of application of the resultant force Fg and the reaction force Fm are very close. For the contact point D, the lever arm of the resultant force Fg is slightly longer than that of the reaction force Fm, but the difference is not significant. Step n has sufficient strength to counteract the resultant force Fg. Bolt 3a also provides some pressure to the upper flange 2, but it is very close to the contact point D and has a short lever arm. The tightening effect of bolt 3a is negligible, or even just acts as a pin, only restricting the horizontal degree of freedom between the upper flange 2 and the right groove side 1b. Since the resultant force Fg on the upper flange 2 is directly transmitted to the flange m on the upper edge of the left groove side 1a and the right groove side 1b, the connecting bolt 3a and nut 3b do not directly bear the force of the scraper, making the connection between the upper flange 2 and the left groove side 1a and the right groove side 1b very reliable.

[0015] In summary, the present invention provides a replaceable upper flange middle trough. Based on the structural characteristics of existing middle troughs, the connecting bolts and limiting structures of the upper flange are reasonably arranged. This not only enables the replacement of the upper flange in the easily worn part of the middle trough, adapting to the special working conditions of the top coal caving face, but also makes the replaceable upper flange compact, simple to manufacture, and easy to disassemble and assemble, effectively ensuring the stable and safe operation of the scraper conveyor.

Claims

1. A replaceable upper wing plate with a central groove, comprising a central groove body (1), a replaceable upper wing plate (2), connecting bolts (3a), and nuts (3b), characterized in that: The upper inner sides of the left sidewall (1a) and right sidewall (1b) of the middle groove body (1) have three flanges m at both ends and the center. There are two horizontal connecting flanges f on the left sidewall (1a) and right sidewall (1b). The replaceable upper wing plate (2) has a step n corresponding to the flange m.

2. The replaceable central groove of the upper wing plate according to claim 1, characterized in that: The length of the replaceable upper wing plate (2) is 1 / 2 of the length of the matching middle groove (1), and the replaceable upper wing plate (2) has a left-right symmetrical structure.

3. The replaceable central groove of the upper wing plate according to claim 1, characterized in that: The replaceable upper wing plate (2) is made of high-strength wear-resistant plate material.

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