Aggregate guiding device and aggregate guiding structure above the boom

Abstract

The present invention relates to a mineral material guiding device and a mineral material guiding structure above the boom. The guiding device includes a guiding groove and a guiding plate extending leftward in the left rear direction of the guiding groove. The groove surface of the guiding groove is a smooth transition concave surface with the front higher than the rear. A continuous edge with the front higher than the rear is formed at the intersection of the outer surface of the right groove wall and the groove surface. The front part of the left end of the guiding groove is the guiding inlet, and the lowest part of the rear end is the unloading port. The top surface of the guiding plate is an inclined surface with the front higher than the rear. A front-rear extending end connecting plate is provided below the guiding groove; the mineral material guiding structure above the boom includes the guiding device and the boom. The mineral material guiding device is arranged on the roller end of the boom with the groove surface of the guiding groove facing upward. The guiding plate and the end connecting plate are respectively positioned and connected to the rear side surface and the end surface of the roller end of the boom. The front and rear ends of the guiding device respectively extend beyond the top of the boom. The present invention is used on a mining machine with a small-diameter roller and a straight boom, and can prevent the mineral material thrown backward by the roller from accumulating on the conveyor shovel plate.

Description

Technical Field

[0001] The present invention relates to a guiding device for ore, which is used in the process of ore loading and is usually arranged at the top of the boom of a mining machine, belonging to the technical field of underground mining machinery. Background Art

[0002] The conditions of bauxite are complex. For example, medium-high grade bauxite ore coexists with medium-low grade bauxite rock. Therefore, it is usually required that the mining equipment has a large cutting capacity. Therefore, medium-high power mining machines are usually used for mining in actual mining. On the other hand, underground bauxite ore usually has the property of layered distribution with different grades of high and low, and at the same time, the thicknesses of the high-grade and low-grade ore layers are unstable and vary greatly. Due to the obvious difference in the economic value of high-grade and low-grade ore, if medium-high power mining machines are still used for mining, it is a mixed mining of ore grades, and obviously, economical mining cannot be achieved.

[0003] In view of the above-mentioned current situation of bauxite mining, the industry has proposed to adopt a structure of a small-diameter drum with a thin strip-shaped boom (usually a straight boom) for layered mining of bauxite ore. However, after the small-diameter drum is equipped with a straight boom, the loading channel under the boom is too small to load, and the ore can only be turned and loaded from above the boom into the conveyor trough. At present, most of the ore at the top of the boom is thrown to the rear and falls on the conveyor shovel plate, and cannot enter the conveyor trough, resulting in excessive accumulation of ore on the roller side of the conveyor, seriously affecting the forward pushing of the conveyor. Summary of the Invention

[0004] The purpose of the present invention is to provide an ore guiding device and an ore guiding structure above the boom to solve the loading problem of a mining machine with a small-diameter drum and a straight boom.

[0005] The main technical solutions of the present invention are as follows:

[0006] An ore guiding device is provided with a guiding groove. The top groove surface of the guiding groove is a smooth transition concave surface with the front higher than the rear, and the groove surface trend extends from the left front to the right rear. The outer surface of the right groove wall of the guiding groove is a curved surface, and the intersection of the outer surface of the right groove wall and the groove surface forms a continuous edge with the front higher than the rear. The front part and the rear part of the continuous edge respectively form the front blocking edge and the rear blocking edge of the guiding groove. The front part of the left end of the guiding groove is the guiding inlet, and the lowest part at the rear end of the groove surface of the guiding groove is the unloading port. The front blocking edge is higher than the guiding inlet, and the rear blocking edge is higher than the unloading port. A guiding plate extending to the left is provided at the rear part of the left end of the guiding groove. The top surface of the guiding plate is an inclined surface with the front higher than the rear. The right end of the top surface of the guiding plate is smoothly connected to the groove surface of the guiding groove. The guiding plate is provided with a positioning connection hole extending in the front-rear direction. A front-rear extending end connection plate is provided below the guiding groove, and the end connection plate is provided with a positioning connection hole extending in the left-right direction.

[0007] The lower surface of the guiding groove may be provided with a flat bottom surface, and in the left-right direction, the flat bottom surface is located between the guiding plate and the end connecting plate.

[0008] In the left-right direction, the end connecting plate may be located in the middle or the right end of the guiding groove.

[0009] When the end connecting plate is located at the right end of the guiding groove, the outer surface of the front side of the bottom adjacent to the flat bottom surface is preferably set to a surface that is higher at the front and lower at the rear.

[0010] The outer surface of the right groove wall of the guiding groove is a cylindrical surface, and the generatrix of the cylindrical surface is parallel to the drum installation center line of the boom.

[0011] A mineral material guiding structure above the boom includes a mining machine boom and the mineral material guiding device. The mineral material guiding device is arranged with the groove surface of the guiding groove facing upward at the drum end of the boom. The guiding plate and the end connecting plate of the mineral material guiding device are respectively positioned and connected to the rear side surface and the end surface of the drum end of the boom. The front-rear width of the mineral material guiding device is greater than the front-rear width of the drum end of the boom, and the front and rear ends of the mineral material guiding device respectively extend forward and backward beyond the top of the boom.

[0012] The distance that the rear end of the mineral material guiding device extends backward beyond the rear side surface of the drum end of the boom is greater than the distance from the rear side surface of the drum end of the boom to the front side surface of the front trough rib of the conveyor.

[0013] The part of the mineral material guiding device other than the guiding plate and the end connecting plate does not contact the boom.

[0014] The upper and lower thickness of the boom gradually thins from the non-drum end to the drum end.

[0015] For the mineral material guiding device with the end connecting plate located in the middle of the guiding groove, the inlet is flush with the top surface of the drum end of the boom.

[0016] The beneficial effects of the present invention are:

[0017] The front blocking edge and the rear blocking edge of the guiding device of the present invention effectively block the continuous sliding of the mineral material from the top surface of the boom and change the flow direction of the mineral material to prevent the mineral material from falling onto the shovel plate of the conveyor. The unloading port located at the lowest position guides the mineral material to continuously enter the conveyor trough through the formed guiding groove flow surface (i.e., the groove surface) that is higher at the front and lower at the rear.

[0018] When the mining machine is in the working state, the front end surface 91 of the support roof beam is basically aligned with the middle-rear position in the front-rear direction of the guiding device. Since the continuous edge formed at the intersection of the outer surface of the right groove wall of the guiding groove and the top groove surface of the guiding groove is higher at the front and lower at the rear, it can ensure that there is still a sufficient roof lifting amount when the small-diameter drum is relative to the thick roof beam support, so as to meet the roof lifting operation requirements of the undulating working face.

[0019] The arrangement of the guiding plate can increase the unloading width of the continuously discharged ore of the drum in the left - right direction, and form a projection angle to increase the amount of ore guided into the conveyor trough, avoiding the ore directly falling into the shovel plate from the left side of the guiding trough.

[0020] The ore guiding structure above the boom with the guiding device externally placed, the front blocking edge 111' and the rear blocking edge 112' with the front - high - and - rear - low shape have better blocking effects, and the unloading port 114' at a lower position has a steeper sliding surface, which can improve the unloading effect, and the guiding inlet 113' close to the top surface of the boom is more conducive to the ore entering the guiding trough. Therefore, the externally placed guiding device has better effects when used on the inclined working surface, not only further increasing the guiding width in the left - right direction but also improving the unloading effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The front view of the first embodiment of the ore guiding structure above the boom of the present invention;

[0022] Figure 2 is Figure 1 the top view;

[0023] Figure 3 is Figure 1 、 2 the front view of the ore guiding device (the first embodiment) in

[0024] Figure 4 is Figure 3 the sectional view taken along K1 - K1 of

[0025] Figure 5 is Figure 1 、 2 the rear view of the ore guiding device (the first embodiment) in

[0026] Figure 6 is Figure 1 、 2 the perspective view of the ore guiding device (the first embodiment) in

[0027] Figure 7 is Figure 1 、 2 the front view of the boom in

[0028] Figure 8 is Figure 1 、 2 the partial top view of the boom in

[0029] Figure 9 The schematic diagram of the working state of the first embodiment of the ore guiding structure above the boom of the present invention;

[0030] Figure 10 Schematic diagram of the end face of the guiding device of the first embodiment of the guiding structure for ore above the boom of the present invention;

[0031] Figure 11 Front view of the second embodiment of the guiding structure for ore above the boom of the present invention;

[0032] Figure 12 Top view of the second embodiment of the guiding structure for ore above the boom of the present invention;

[0033] Figure 13 is Figure 11 Cross-sectional view taken along K2-K2 of

[0034] Figure 14 Stereogram of the second embodiment of the guiding structure for ore above the boom of the present invention;

[0035] Figure 15 Schematic diagram of the working state of the right boom corresponding to the second embodiment of the guiding structure for ore above the boom of the present invention on an inclined working face;

[0036] Figure 16 Schematic diagram of the working state of the left boom corresponding to the second embodiment of the guiding structure for ore above the boom of the present invention on an inclined working face.

[0037] Reference numerals:

[0038] 1, 1'. Guiding device; 11, 11'. Guiding groove; 111, 111'. Front blocking edge; 112, 112'. Rear blocking edge; 113, 113'. Inlet; 114, 114'. Discharge port; 12, 12'. Outer surface of the right groove wall; 13. End connecting plate; 131. Pin hole; 132. Connecting hole; 133. Left end face of the end connecting plate; 14. Guide plate; 141. Pin hole; 142. Connecting hole; 143. Front side face of the guide plate; 144. Top face of the guide plate; 16. Flat bottom face; 17. Front side outer surface at the bottom;

[0039] 2. Boom; 21. Top face of the boom; 221. Boom end pin hole; 222. Boom end connecting hole; 223. End face of the roller end of the boom; 231. Boom side pin hole; 232. Boom side connecting hole; 233. Rear side face of the roller end of the boom; 234. Boom side support surface; 24. Front side housing at the roller end of the boom;

[0040] 3. End pin;

[0041] 4. Fastening screw;

[0042] 5. Side pin;

[0043] 6. Roller;

[0044] 91. Front end face of the support roof beam; 92. Conveyor trough; 93. Conveyor scraper plate;

[0045] A. Ore accumulation profile before installing the guiding device; B. Ore accumulation profile after installing the guiding device. Detailed implementation manner

[0046] The present invention discloses a kind of ore guiding device (which can be simply called guiding device) 1 (or 1'), as Figure 1 - 16 shown, on which there is a guiding groove 11 (or 11'), the top groove surface of the guiding groove is a smooth transition concave surface with the front higher than the rear, and the groove surface trend extends from the left front to the right rear. The outer surface 12 (or 12') of the right groove wall of the guiding groove is a curved surface, usually a convex curved surface, and the intersection of the outer surface of the right groove wall and the groove surface forms a continuous edge with the front higher than the rear, and this continuous edge is used to prevent the ore entering the guiding groove from slipping out from the right end. The front part and the rear part of this continuous edge respectively constitute the front blocking edge 111 (or 111') and the rear blocking edge 112 (or 112') of the guiding groove. The front part of the left end of the guiding groove is the guiding inlet 113 (or 113'), and the lowest part at the rear end of the groove surface of the guiding groove is the unloading port 114 (or 114'). The front blocking edge is higher than the guiding inlet, and the rear blocking edge is higher than the unloading port. The rear part of the left end of the guiding groove is provided with a guiding plate 14 extending to the left, and the top surface 144 of the guiding plate is an inclined surface with the front higher than the rear, usually a smooth continuous surface, which can be either a plane or a curved surface, and is used to guide the ore falling on it to slide into the conveyor trough 92 from the rear. The right end of the top surface 144 of the guiding plate is smoothly connected to the groove surface of the guiding groove. The guiding plate is provided with positioning connection holes extending in the front-rear direction. Below the guiding groove, there is an end connecting plate 13 extending in the front-rear direction, and the end connecting plate is provided with positioning connection holes extending in the left-right direction. The guiding plate, the end connecting plate and the positioning connection holes on them are used as the connection interface structure when the ore guiding device is installed on the mining machine boom.

[0047] The guiding device is installed and used above the drum end of the mining machine boom. A double-rocker mining machine needs to install a pair of symmetrically left and right guiding devices. The guiding groove is used to change the flow direction of the material. When the guiding device is used on the right boom of the mining machine, a guiding device with the groove surface trend extending from the left front to the right rear is used. The ore enters the guiding groove from the guiding inlet at the left front, is blocked by the continuous edge on the right side, slides along the groove surface of the guiding groove to the right rear, and finally flows out from the unloading port. When the guiding device is used on the left boom of the mining machine (see Figure 16 ), a guiding device with the groove surface trend extending from the right front to the left rear is used. The ore enters the guiding groove from the guiding inlet at the right front, is blocked by the continuous edge on the left side, slides along the groove surface of the guiding groove to the left rear, and finally flows out from the unloading port.

[0048] The positioning connection holes include positioning holes and connection holes, attachedFigure 3 - 6 The pin holes 131 on the middle connection plate at the 14th end are positioning holes, and a plurality of connection holes 132 are distributed around each pin hole 131. The pin hole 141 on the guide plate is a positioning hole, and there are also a plurality of connection holes 142.

[0049] The setting of the guide plate can increase the unloading width of the ore continuously thrown out by the drum in the left - right direction. The inclined surface on its top surface is used to form a projection angle, increasing the amount of ore guided into the conveying trough 92 of the conveyor, and preventing the ore from directly falling into the conveyor shovel plate 93 from the left side of the guide trough. The left - right length of the guide plate can be designed according to actual needs. The length of the guide plate determines the range within which the ore thrown backward by the drum 6 can be guided into the conveying trough 92 of the conveyor. Usually, the end connection plate is a guiding device located in the middle of the guide trough, and the length of its guide plate is longer.

[0050] A transition surface can be provided or not provided between the front end of the right part of the guide plate and the left end of the guide trough, mainly depending on the connection situation between the guide trough and the top surface of the drum end of the boom when the guide trough is in different installation positions. The transition surface is mainly used to fill the gap between the guide trough and the top surface of the drum end of the boom, and can be regarded as an extension of the guide plate towards the front. When the transition surface is provided, it is higher at the front and lower at the rear. In the first embodiment, there is a transition surface, and in the second embodiment, there is no transition surface.

[0051] A flat bottom surface 16 can be provided on the lower surface of the guide trough. In the left - right direction, the flat bottom surface is located between the guide plate and the end connection plate. The front side surface 143 of the guide plate and the left side surface 133 of the end connection plate are used as positioning surfaces when the ore guiding device is installed on the boom of the mining machine. The set height of the flat bottom surface is usually the height that keeps a gap between the ore guiding device and the top surface 21 of the boom in the up - down direction when the ore guiding device is installed on the boom, so as to ensure the smooth installation of the positioning parts when the guide plate and the end connection plate are connected to the boom.

[0052] In the left - right direction, the end connection plate can be located in the middle of the guide trough (see the second embodiment) or at the right end (see the first embodiment). The position of the end connection plate determines the left - right position of the ore guiding device relative to the boom after it is installed on the mining machine. When the end connection plate is located in the middle of the guide trough, the guide trough of the ore guiding device can be located outside the drum end of the boom. Since there is more space, the right trough wall can be set higher, so that the front and rear blocking edges 111' and 112' formed by the intersection of the outer surface 12' of the right trough wall and the trough surface of the guide trough 11' have a better blocking effect, and the unloading port can be set lower, making the guide trough have a steeper sliding surface, thus further improving the unloading effect.

[0053] When the end connecting plate is located at the right end of the guiding groove, the front side outer surface 17 adjacent to the flat bottom surface is preferably arranged as a surface that is higher at the front and lower at the rear, so as to avoid interference with the front side housing of the roller end of the mining machine boom, and ensure that there is a sufficient gap between the corresponding position and the boom, and ensure the smooth installation of the positioning member when the guiding plate and the end connecting plate are connected to the boom. In the embodiment shown in the attached drawing, the outer surface 17 is a convex curved surface that is higher at the front and lower at the rear.

[0054] The outer surface 12 of the right groove wall of the guiding groove is preferably a cylindrical surface, and the generatrix of the cylindrical surface is parallel to the roller installation center line of the boom. In the first and second embodiments, it is preferably a cylindrical surface r with the roller installation center line of the boom as the axis. In fact, it can also be other convex curved surfaces close to the cylindrical surface. While forming the continuous edge for blocking, it does not prevent the axial pushing of the ore by the roller blades.

[0055] The present invention also discloses a structure for guiding ore above the boom, including a mining machine boom 2 and the ore guiding device 1. The ore guiding device is arranged with the groove surface of the guiding groove facing upward at the roller end of the boom. The guiding plate and the end connecting plate of the ore guiding device are respectively positioned and connected to the rear side surface 233 of the roller end of the boom and the end surface 223 of the roller end of the boom through positioning fastening connectors. The front-back width of the ore guiding device is greater than the front-back width of the roller end of the boom, and the front and rear ends of the ore guiding device respectively extend forward and backward beyond the top of the boom. This structure for guiding ore above the boom is mainly used for mining machines with a straight boom supporting a small-diameter roller.

[0056] The guiding device can guide the ore that is thrown by the roller to the top surface of the boom and then slides down into the conveying trough 92 of the conveyor behind the boom, improving the loading effect of the straight boom supporting a small-diameter roller (see the ore accumulation contour B after installing the guiding device in Figure 10 ), and avoiding the problem that when the ore guiding device is not installed, the ore slides down along the top surface of the boom to the conveyor shovel plate, resulting in excessive ore accumulation on the roller side of the conveyor (see the ore accumulation contour A before installing the guiding device in Figure 10 ), which causes difficulties in pushing the conveyor.

[0057] The continuous edge that is higher at the front and lower at the rear can maintain a sufficient roof lifting amount when the small-diameter roller is equipped with a thick roof beam support.

[0058] The top surface of the guiding plate that extends left and right and is higher at the front and lower at the rear can make the ore thrown out from the rear of the entire roller unload as much as possible to the conveying trough 92 of the conveyor behind after passing through the boom and / or the guiding device, avoiding the ore from falling into the gap between the boom and the trough side, and further improving the loading effect of the ore.

[0059] The distance by which the rear end of the ore guiding device extends backward beyond the rear side of the drum end of the boom is greater than the distance from the rear side of the drum end of the boom in the working state of the mining machine to the front side of the front trough side of the conveyor. Usually, the rear end of the ore guiding device extends backward and overhangs above the front trough side of the conveyor. Whether it is the guiding trough or the guiding plate, due to its surface that is higher at the front and lower at the rear, which forms a projection angle, even if the rear end of the guiding device does not extend backward and overhang above the conveying trough of the conveyor, the ore can still smoothly enter the conveying trough of the conveyor.

[0060] The part of the ore guiding device other than the guiding plate and the end connecting plate usually does not contact the boom, especially in the vertical direction, to ensure the smooth installation of the positioning parts.

[0061] The positioning and fastening connecting parts include positioning parts and fastening parts. In the figure, the end pin 3 and the side pin 5 are positioning parts, and the fastening screw 4 is a fastening part. On the rear side surface 233 of the drum end of the boom, there are provided a boom side pin hole 231, a boom side connecting hole 232, and a section of boom side support surface 234 that protrudes outward backward. On the end surface 223 of the drum end of the boom, there are provided a boom end pin hole 221 and a boom end connecting hole 222. The connection between the guiding plate and the rear side surface 233 of the drum end of the boom forms a side connection, and the connection between the end connecting plate and the end surface 223 of the drum end of the boom forms an end connection. The side connection and the end connection provide reliable guarantee for the positioning and fastening of the guiding device. Even during abnormal operations such as when the drum of the mining machine scratches the inner arc surface of the support roof beam, it can ensure the reliable connection between the guiding device and the boom. During use, if the pin hole of the side pin 5 becomes larger, the guiding device can use the boom side support surface 234 for auxiliary positioning in the vertical direction. During positioning, the bottom surface of the guiding plate supports on the boom side support surface 234.

[0062] The vertical thickness of the boom gradually decreases from the non-drum end to the drum end, which is beneficial for the ore to slide downward towards the end of the boom. The sliding ore enters the guiding trough from the guiding inlet, is blocked by the front and rear blocking edges and no longer continues to slide downward, and changes direction and flows backward along the trough surface.

[0063] The boom is preferably a straight strip-shaped and vertically symmetric structure to meet the requirements of having a large enough roof lifting amount and bottom cutting amount for a small-diameter drum.

[0064] The front side shell 24 of the drum end of the boom is preferably provided with an outwardly convex curved surface strengthening structure that is larger at the front and smaller at the rear along the radial direction of the drum installation center line. For the ore guiding device with the end connecting plate located at the right end of the guiding trough, the front side outer surface 17 of the bottom of the ore guiding device adjacent to the flat bottom surface is a surface that is higher at the front and lower at the rear. Just in terms of the installation space, it can adapt to the front side shell 24 of the drum end of the boom, and there is a gap between the two to ensure the smooth positioning and installation of the positioning parts.

[0065] For the ore guiding device where the end connecting plate is located in the middle of the guiding groove, in the installed state, as Figure 11 , 12 , as shown in Fig. 15, the guiding groove is just located at a position outside the top surface end of the roller end of the boom. This installation state can be called the external installation of the guiding device. When installed externally, the guiding inlet is preferably flush or substantially flush with the top surface of the roller end of the boom, which is more conducive to the ore entering the guiding groove. The external installation of the guiding device has better effects when used on the inclined working surface of the mining machine, not only further lengthening the guiding width in the left and right directions, but also improving the discharging effect.

[0066] The left and right directions mentioned in this article only represent the relative position relationship and are not restrictions on the absolute orientation. Therefore, the left and right directions can be swapped. Regarding the front and back directions, the roller is located in front of the boom.

Claims

1. A mineral material guiding device, characterized in that: it is provided with a guiding groove, the top groove surface of the guiding groove is a smooth transition concave surface with the front higher than the rear, the groove surface trend extends from the left front to the right rear, the outer surface of the right groove wall of the guiding groove is a curved surface, and the intersection of the outer surface of the right groove wall and the groove surface forms a continuous edge with the front higher than the rear. The front part and the rear part of this continuous edge respectively constitute the front blocking edge and the rear blocking edge of the guiding groove. The front part of the left end of the guiding groove is the guiding inlet, the lowest part at the rear end of the groove surface of the guiding groove is the unloading port, the front blocking edge is higher than the guiding inlet, the rear blocking edge is higher than the unloading port, a guiding plate extending to the left is provided at the rear part of the left end of the guiding groove, the top surface of the guiding plate is an inclined surface with the front higher than the rear, the right end of the top surface of the guiding plate is smoothly connected to the groove surface of the guiding groove, and positioning connection holes extending in the front-rear direction are provided on the guiding plate. A front-rear extending end connecting plate is provided below the guiding groove, and positioning connection holes extending in the left-right direction are provided on the end connecting plate.

2. The mineral material guiding device according to claim 1, characterized in that: a flat bottom surface is provided on the lower surface of the guiding groove, and in the left-right direction, the flat bottom surface is located between the guiding plate and the end connecting plate.

3. The mineral material guiding device according to claim 2, characterized in that: in the left-right direction, the end connecting plate is located in the middle or the right end of the guiding groove.

4. The mineral material guiding device according to claim 3, characterized in that: when the end connecting plate is located at the right end of the guiding groove, the outer surface of the bottom front side adjacent to the flat bottom surface is arranged as a surface with the front higher than the rear.

5. The mineral material guiding device according to claim 1, 2, 3 or 4, characterized in that: the outer surface of the right groove wall of the guiding groove is a cylindrical surface, and the generatrix of the cylindrical surface is parallel to the drum installation center line of the boom.

6. A mineral material guiding structure above the boom, characterized in that: it includes a mining machine boom and the mineral material guiding device according to any one of claims 1-5. The mineral material guiding device is arranged with the groove surface of the guiding groove facing upward at the drum end of the boom. The guiding plate and the end connecting plate of the mineral material guiding device are respectively positioned and connected to the rear side surface and the end surface of the drum end of the boom. The front-rear width of the mineral material guiding device is greater than the front-rear width of the drum end of the boom, and the front and rear ends of the mineral material guiding device respectively extend forward and backward beyond the top of the boom.

7. The mineral material guiding structure above the boom according to claim 6, characterized in that: the distance that the rear end of the mineral material guiding device extends backward beyond the rear side surface of the drum end of the boom is greater than the distance from the rear side surface of the drum end of the boom to the front side surface of the front trough rib of the conveyor.

8. The mineral material guiding structure above the boom according to claim 7, characterized in that: the part of the mineral material guiding device other than the guiding plate and the end connecting plate does not contact the boom.

9. The mineral material guiding structure above the boom according to claim 6, 7 or 8, characterized in that: the up-down thickness of the boom gradually decreases from the non-drum end to the drum end.

10. The mineral material guiding structure above the boom according to claim 9, characterized in that: For the ore guiding device where the end connection plate is located in the middle of the guiding groove, the guiding inlet is flush with the top surface of the roller end of the boom.

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