Coal plough plate design method based on brachiostost and scraper conveyor coal plough plate

Abstract

The invention discloses a coal plough plate design method based on a brachiostost and a scraper conveyor coal plough plate. A ray M with an angle of beta is made in the coal flow direction by taking a coal flow inlet point as a starting point; drawing a ray N with an angle of alpha in the opposite direction of the coal flow by taking the coal flow outlet point as a starting point; arcs with different radiuses R are made in sequence from small to large along the angular bisectors of the ray M and the ray N and are tangent to the ray M and the ray N, the distance S from the circle center of the arc to the point P and the distance X from the arc to the point P are measured, and the value of the radius R of the arc is obtained; measuring the distance value (a, b) of the arc end point relative to the arc starting point in the horizontal state of the coal flow inlet, solving the ratio of # imgabs0 #, and obtaining the value of the arc end point parameter theta end; obtaining the value of a parameter k according to the obtained theta final value and the distance value (a, b); according to the obtained k value, corresponding coordinate values (a variation and b variation) are obtained according to the value range of theta variation, a coal plough plate fast drop curve can be obtained, and the coal flow guiding performance of the coal plough plate is improved, the running resistance is reduced, the unloading effect is improved, and the abrasion of the coal plough plate is reduced by designing the brachistochrone coal plough plate.

Description

Technical Field

[0001] The invention relates to the technical field of mining conveying equipment, and in particular to a design method of a coal plow board based on a brachistocentric line and a coal plow board for a scraper conveyor. Background Art

[0002] Cross-side unloading scraper conveyors are widely used in fully mechanized mining faces of coal mines at home and abroad. It has been proved that the cross-side unloading method can reduce the height of the conveyor head, facilitate tunnel support, and realize rapid advancement of the chute. It has the advantages of convenient matching, convenience and high efficiency. However, the cross-side unloading scraper conveyors also have problems such as poor coal flow, easy accumulation of coal flow, large coal flow turning resistance, high power consumption, operating resistance, and fast wear of parts.

[0003] like Figure 1 As shown, during use, the head of the cross-side unloading scraper conveyor is connected to the tail of the transfer machine as a whole, and the coal flow is unloaded from the conveyor head to the transfer machine at a 90° angle. In this process, since the coal flow needs to achieve a 90° turn in the direction of movement within a distance of 2 to 3 meters from the conveyor head, coupled with the uneven changes in the coal flow during mining, the above-mentioned problems such as poor coal flow are prone to occur. In addition, due to the limitations of the roadway layout and coal mining process, it is difficult to solve the above-mentioned problems by lengthening the guide distance.

[0004] The plow board is installed on the head of the cross-side unloading scraper conveyor, and is mainly responsible for changing the direction of coal flow transportation. It is one of the indispensable key components of the scraper conveyor to guide the coal flow from the conveyor head to 90 degrees and unload it to the transfer machine. Its coal flow guiding performance directly affects indicators such as power loss, coal flow unloading effect, and head wear life. Improving the coal flow guiding performance of the plow board can dredge the coal flow, reduce power consumption, reduce operating resistance, and reduce the wear of the head plow board.

[0005] At present, the scraper conveyor equipment cross-side unloading machine head plow board, usually as Figure 2 As shown, the conventional cross-side unloading head plow plate adopts a straight line, a broken line or a simple circular arc line, the angle between the guide bevel and the center line of the chute is 11-14°, the distance S between the guide bevel and the tip of the side plate of the head frame unloading port is greater than the chute width B, the arc radius of the plow plate R = (1-1.3) B, and the distance between the interface point between the plow plate and the transfer machine baffle and the center line of the transfer machine chute is 1 / 2 of the transfer machine chute width: it is composed of a straight line, a broken line or a simple circular arc line, and the material transportation guiding effect is not ideal. The head is prone to poor coal flow, easy accumulation of coal flow, large coal flow turning resistance, high power consumption, operation resistance, and fast wear of parts, which seriously affect production efficiency. Summary of the invention

[0006] In order to solve the technical problems existing in the above-mentioned technologies, it is necessary to provide a design method of a coal plow plate based on the brachistochrone line.

[0007] A method for designing a plow board based on the brachistocentre line comprises the following steps:

[0008] Step S1: Determine the coal flow inlet point and the coal flow outlet point of the coal plow plate according to the conveyor and transfer machine models;

[0009] Step S2: Take the coal flow inlet point as the starting point and make a ray M with an angle of β in the direction of the coal flow; take the coal flow outlet point as the starting point and make a ray N with an angle of α in the opposite direction of the coal flow; then the ray M and the ray N intersect at point P;

[0010] Step S3: With point P as the starting point, draw an angular bisector of rays M and N, and draw arcs of different radii R from small to large along the angular bisector to be tangent to rays M and N, measure the distance S from the center of the arc to point P, and the distance X from the arc to point P, optimize the value of X by debugging and rounding, and obtain the value of the arc radius R;

[0011] Step S4: after determining the arc radius R, the coal plow plate is rotated by an angle β to a horizontal state of the coal flow inlet;

[0012] Step S5: Measure the distance (a, b) between the end point of the arc and the starting point of the arc, and calculate The ratio of the arc end point parameter θ is obtained. 终 The value of

[0013] Step S6: Based on the obtained arc endpoint parameter θ 终 The value of and the distance between the end point of the arc and the starting point of the arc (a, b) are used to obtain the value of parameter k.

[0014] Step S7: According to the obtained value of k, according to θ 变 The value range is used to obtain the corresponding coordinate value (a 变 ,b 变 ), the coal plow plate velocity drop curve can be obtained, and this curve and the two rays drawn through the coal flow inlet and coal flow outlet points before constitute the design curve of the coal plow plate coal flow guide plate;

[0015] Step S8: After completing the design curve of the coal plowing plate coal flow guide plate, the other structural designs of the coal plowing plate can be completed in sequence.

[0016] Preferably, in step S2, the angle β has a value range of 10 to 30 degrees.

[0017] Preferably, in step S2, the angle α has a value range of 8 to 26 degrees.

[0018] Preferably, in step S3, the value of the arc radius R is obtained by the following formula:

[0019] S=R+X

[0020] Wherein, R represents: the radius of the arc; S represents: the distance from the center of the arc to point P; X represents: the distance between the arc and point P, X≈160mm, and 80mm<X<240mm.

[0021] Preferably, in step S5, the arc endpoint parameter θ 终 The value of is obtained by the following formula:

[0022]

[0023] in, is the ratio of the distance (a, b) between the end point of the arc and the starting point of the arc, θ 终 Indicates: arc end point parameters.

[0024] Preferably, in step S6, the value of parameter k is obtained by the following formula:

[0025]

[0026] Among them, θ 终 Indicates: the arc end point parameters; (a,b) indicates: the distance value of the arc end point relative to the arc starting point.

[0027] Preferably, in step S7, the coordinate value (a 变 ,b 变 ) is obtained by the following formula,

[0028]

[0029] Among them, the value of k is a constant; θ 变 The value range is: 0~θ 终 .

[0030] It is also necessary to provide a scraper conveyor plow board.

[0031] A scraper conveyor coal plow board is obtained by using the above-mentioned coal plow board design method based on the brachistocentre line.

[0032] Compared with the prior art, the plow board design method based on the brazilian drop line and the scraper conveyor plow board provided by the present invention improve the coal flow guiding performance of the plow board by designing the brazilian drop line plow board, improve the problems of poor coal flow at the head of the cross-side unloading scraper conveyor, large coal flow turning resistance, high power consumption, and fast wear of parts such as the plow board, reduce power consumption, reduce operating resistance, improve unloading effect, and reduce wear of the plow board at the head. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of a cross side discharge scraper conveyor in the prior art.

[0035] Figure 2 It is a top view of the cross side unloading machine head in the prior art.

[0036] Figure 3 This is a schematic diagram of the structure connecting the conveyor and the transfer machine.

[0037] Figure 4 Schematic diagram of the coal flow inlet and outlet points of the coal plow plate.

[0038] Figure 5 Schematic diagram of ray M and ray N.

[0039] Figure 6 A schematic diagram for measuring the distance (a, b) between the end point of an arc and the starting point of the arc.

[0040] Figure 7 Schematic diagram of the simulation of the coal flow guiding performance of the plow plate.

[0041] Figure 8 The maximum stress value monitoring table of the coal plow plate of the present invention and the prior art is shown.

[0042] Fig. 9 It is the maximum stress value of the coal plow plate of the present invention and the prior art.

[0043] In the figure: head frame 1, coal plowing plate 2, S-shaped movable middle plate 3. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0046] In one embodiment, the present invention provides a method for designing a plowboard based on the brachistochrone line, comprising the following steps:

[0047] Step S1: Figure 3 to Figure 4 As shown, the coal flow inlet point and coal flow outlet point of the coal plow plate are determined according to the conveyor and transfer machine models; the coal flow inlet point is determined by the conveyor trough width, and the coal flow outlet point is determined by the transfer machine trough width and machine head model;

[0048] Step S2: Take the coal flow inlet point as the starting point and make a ray M with an angle of β in the direction of the coal flow; take the coal flow outlet point as the starting point and make a ray N with an angle of α in the opposite direction of the coal flow; then the ray M and the ray N intersect at point P;

[0049] Step S3: With point P as the starting point, draw an angular bisector of rays M and N, and draw arcs of different radii R from small to large along the angular bisector to be tangent to rays M and N, measure the distance S from the center of the arc to point P, and the distance X from the arc to point P, optimize the value of X by debugging and rounding, and obtain the value of the arc radius R;

[0050] Step S4: after determining the arc radius R, the coal plow plate is rotated by an angle β to a horizontal state of the coal flow inlet;

[0051] Step S5: Measure the distance (a, b) between the end point of the arc and the starting point of the arc, and calculate The ratio of the arc end point parameter θ is obtained. 终 The value of

[0052] Step S6: Based on the obtained arc endpoint parameter θ 终 The value of and the distance between the end point of the arc and the starting point of the arc (a, b) are used to obtain the value of parameter k.

[0053] Step S7: According to the obtained value of k, according to θ 变 The value range is used to obtain the corresponding coordinate value (a 变 ,b 变 ), the coal plow plate velocity drop curve can be obtained, and this curve and the two rays drawn through the coal flow inlet and coal flow outlet points before constitute the design curve of the coal plow plate coal flow guide plate;

[0054] Step S8: After completing the design curve of the coal plowing plate coal flow guide plate, the other structural designs of the coal plowing plate can be completed in sequence.

[0055] Specifically, in step S2, the angle β has a value range of 10 to 30°; the specific value is determined by parameters such as the size of the equipment model and the size of the raw coal in the coal flow.

[0056] Specifically, in step S2, the angle α has a value range of 8 to 26°; the specific value is determined by parameters such as the size of the equipment model and the size of the raw coal in the coal flow.

[0057] Specifically, in step S3, the value of the arc radius R is obtained by the following formula:

[0058] S=R+X

[0059] Wherein, R represents: the radius of the arc; S represents: the distance from the center of the arc to point P; X represents: the distance between the arc and point P, X≈160mm, and 80mm<X<240mm.

[0060] Specifically, in step S5, the arc endpoint parameter θ 终 The value of is obtained by the following formula:

[0061]

[0062] in, is the ratio of the distance between the end point of the arc and the starting point of the arc (a, b), θ 终 Indicates: arc end point parameters.

[0063] Specifically, in step S6, the value of parameter k is obtained by the following formula:

[0064]

[0065] Among them, θ 终 Indicates: the arc end point parameters; (a,b) indicates: the distance value of the arc end point relative to the arc starting point.

[0066] Specifically, in step S7, the coordinate value (a 变 ,b 变 ) is obtained by the following formula,

[0067]

[0068] Among them, the value of k is a constant; θ 变 The value range is: 0~θ 终 .

[0069] A scraper conveyor coal plow board is obtained by using the above-mentioned coal plow board design method based on the brachistocentre line.

[0070] from Figure 7We can intuitively see that the coal flow of the fast-drop line plow plate is more compact and smooth, and the coal flow turning resistance is small, which can reduce power consumption, reduce operating resistance, improve unloading effect, and reduce wear on the machine head plow plate.

[0071] from Figure 8 , Fig. 9 We can analyze that the maximum stress value of the downhill line plow board is about 13% lower than that of the traditional plow board.

[0072] What is disclosed above is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A method for designing a coal plow board based on the brachistocentre line, characterized in that: The following steps are included: Step S1: Determine the coal flow inlet point and the coal flow outlet point of the coal plow plate according to the conveyor and transfer machine models; Step S2: Taking the coal flow inlet point as the starting point, draw a ray M with an angle of β in the direction of the coal flow; Take the coal flow outlet point as the starting point and make a ray N with an angle of α in the opposite direction of the coal flow; then the ray M and ray N intersect at point P; Step S3: With point P as the starting point, draw an angular bisector of rays M and N, and draw arcs of different radii R from small to large along the angular bisector to be tangent to rays M and N, measure the distance S from the center of the arc to point P, and the distance X from the arc to point P, optimize the value of X by debugging and rounding, and obtain the value of the arc radius R; Step S4: after determining the arc radius R, the coal plow plate is rotated by an angle β to a horizontal state of the coal flow inlet; Step S5: Measure the distance (a, b) between the end point of the arc and the starting point of the arc, and calculate The ratio of the arc end point parameter θ is obtained. 终 The value of Step S6: Based on the obtained arc endpoint parameter θ 终 The value of and the distance between the end point of the arc and the starting point of the arc (a, b) are used to obtain the value of parameter k. Step S7: According to the obtained value of k, according to θ 变 The value range is used to obtain the corresponding coordinate value (a 变 ,b 变 ), the coal plow plate velocity drop curve can be obtained, and this curve and the two rays drawn through the coal flow inlet and coal flow outlet points before constitute the design curve of the coal plow plate coal flow guide plate; Step S8: After completing the design curve of the coal plowing plate coal flow guide plate, the other structural designs of the coal plowing plate can be completed in sequence.

2. The method for designing a plowboard based on the brachistocentre curve according to claim 1, characterized in that: In step S2, the angle β has a value ranging from 10° to 30°.

3. The method for designing a plowboard based on the brachistocentre curve according to claim 2, characterized in that: In step S2, the angle α has a value range of 8 to 26 degrees.

4. The method for designing a plowboard based on the brachistocentre curve according to claim 1, characterized in that: In step S3, the value of the arc radius R is obtained by the following formula: S=R+X Wherein, R represents: the radius of the arc; S represents: the distance from the center of the arc to point P; X represents: the distance between the arc and point P, X≈160mm, and 80mm<X<240mm.

5. The method for designing a plowboard based on the brachistochrone line according to claim 1, characterized in that: In step S5, the arc endpoint parameter θ 终 The value of is obtained by the following formula, in, is the ratio of the distance between the end point of the arc and the starting point of the arc (a, b), θ 终 Indicates: arc end point parameters.

6. The method for designing a plowboard based on the brachistocentre curve according to claim 1, characterized in that: In step S6, the value of parameter k is obtained by the following formula: Among them, θ 终 Indicates: the arc end point parameters; (a,b) indicates: the distance value of the arc end point relative to the arc starting point.

7. The method for designing a plowboard based on the brachistocentre curve according to claim 6, characterized in that: In step S7, the coordinate value (a 变 ,b 变 ) is obtained by the following formula, Among them, the value of k is a constant; θ 变 The value range is: 0~θ 终 .

8. A coal plowing plate for a scraper conveyor, characterized in that: The method for designing a plow board based on the brachistocentric curve according to any one of claims 1 to 7 is adopted to obtain the plow board.

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