Stable and reliable mine draw shaft grizzly structure

Abstract

The utility model belongs to the technical field of mining, and particularly discloses a stable and reliable mine draw shaft grizzly structure. A walling crib foundation of the draw shaft grizzly structure is fixed at an upper wellhead of a draw shaft, a grizzly covers the wellhead of the draw shaft, and the outer side of the grizzly is embedded in the walling crib foundation; a car arrester is fixed to the side, facing the ore unloading roadway, of the walling crib foundation and comprises a concrete car arresting platform with the bottom face fixed to the walling crib foundation, an inclined face is arranged on the side, facing the ore unloading roadway, of the car arresting platform, and the inclined face gradually rises from the side of the ore unloading roadway to the side of the grizzly screen. A plurality of metal rods with the top faces parallel to the inclined face and extending in the inclined direction are embedded in the inclined face at intervals, and the top faces of the metal rods are not lower than the inclined face. The concrete car stopping platform is fixedly arranged on the well ring foundation, and the metal rods are fixed on the inclined surface of the car stopping platform, so that the impact resistance and the wear resistance of the car stopping device are effectively improved, the production and use cycle of the draw shaft grizzly structure is remarkably prolonged, and the draw shaft grizzly structure has the characteristics of simple structure, convenience in maintenance, low cost and long service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of ore dressing equipment, and in particular relates to a stable and reliable mine chute grid screen structure with simple structure, convenient maintenance, low cost and long service life. Background Art

[0002] A chute is a tunnel that uses its own weight to slide ore from top to bottom. As one of the auxiliary development tunnels in underground mines, it is widely used in the transportation of ore or waste rock in underground mines. When transporting ore in underground mines, in order to prevent ore from getting stuck in the chute, a screen is usually installed at the chute mouth to prevent large pieces of ore from entering the chute. In addition, in order to block unloading vehicles and shovel vehicles to ensure safety during transportation, a vehicle blocking facility needs to be installed on the top of the chute.

[0003] At present, most of the traditional chute car blocking facilities use ore piled up in piles at the wellhead or use a mining I-beam or wooden block to block the obstacle. However, the pile of materials or I-beams and wooden blocks cannot be too high due to the height limit of the cargo box of the ore unloading vehicle and the bucket of the shovel vehicle, so the pile of materials or I-beams and wooden blocks will be crushed to form a natural slope in a short time, and thus cannot play a blocking role. For this reason, the prior art also adopts chute guardrails or uses open-type chute car blocking devices alone. Among them, due to the limitation of the structure of the chute guardrail itself, it is difficult to effectively block the ore unloading vehicle / shovel vehicle, which is easy to cause vehicle and personnel accidents; and the open-type chute car blocking device requires special personnel to operate each shift, which not only leads to waste of human resources and increases the cost of transportation, but also the device itself is relatively bulky, resulting in high labor intensity for the operator, and it is easy to be damaged after multiple openings and closings. In addition, it is also common in the prior art to set a concrete retaining wall at the wellhead as a car blocker (such as Figure 1As shown in the figure, it avoids the disadvantage of requiring special personnel to operate and solves the problem of insufficient structural strength of the chute guardrail. However, in order to reduce dust pollution underground, it is necessary to repeatedly sprinkle water on the ore, resulting in a humid environment. In addition, due to factors such as wellhead cleaning, repeated crushing, friction, and collision of unloading vehicles and shovel vehicles, the bearing coefficient of the concrete retaining wall is sharply reduced, resulting in a short usable period. In addition, there are problems such as difficulty in repair, high safety risks, and impact on production. In addition, in the prior art, a first blocking frame is vertically fixed at the rear end of the base, and a second blocking frame is vertically hinged at the front end, and a buffer mechanism is provided between the first blocking frame and the second blocking frame, so that the second blocking frame can play a buffering role after the vehicle contacts it, and when the vehicle violently hits the second blocking frame, the first blocking frame is still there at the back to block the vehicle, which not only improves the reliability of the blocker, but also can achieve automatic reset through the buffer mechanism, which not only does not require special operation to reduce labor costs, but also reduces the labor intensity of manual operation; but since the buffer mechanism is easily damaged due to rust and blockage by falling ore, and the hinged part is also easily damaged due to the impact of the vehicle, the failure rate is high, resulting in a large maintenance workload and high maintenance costs.

[0004] Secondly, the current chute grid screen generally uses multiple steel bars welded into a mesh structure, and is arranged horizontally on the chute, and is directly poured with concrete around it. Since the large pieces of ore blocked by the chute grid screen are mostly directly crushed by a crushing head, during the crushing operation, the crushing head will inevitably impact the chute grid screen, causing the chute grid screen to loosen or even be damaged, which is easy to affect the safe transportation of the ore. Therefore, it is necessary to repair and replace it in time, which not only makes repair and replacement difficult, but also has high costs. In the prior art, there is a method of setting an inclined chute grid screen at the wellhead, so that when large pieces of ore fall, they can roll to the relatively lower side of the grid screen under the action of their own gravity, so as to facilitate centralized crushing, which not only improves the efficiency of the crushing operation, but also reduces the probability of the crushing head touching the grid screen, thereby achieving the purpose of reducing the damage of the grid screen by the crushing head. However, the inclined chute grid screen will also cause the smaller ores unloaded later to be easily accumulated on the previous large pieces and difficult to fall, which is easy to cause the grid screen to be blocked, which not only affects the unloading efficiency, but also increases the crushing workload of the crushing head. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a stable and reliable mine chute grid screen structure which has a simple structure, convenient maintenance, low cost and a long service life.

[0006] The utility model is implemented as follows: it comprises a chute, a well ring foundation, and a grating screen, wherein the well ring foundation is a concrete annular casting fixedly arranged at the upper well mouth of the chute, and the grating screen covers the upper well mouth of the chute and is buried in the well ring foundation on the outside;

[0007] A car stopper higher than the bottom of the ore unloading chamber is fixedly arranged on the side of the shaft ring foundation facing the ore unloading tunnel, and the car stopper includes a concrete car stopper platform with a bottom surface fixedly connected to the shaft ring foundation, and a slope is arranged on the side of the car stopper platform facing the ore unloading tunnel, and the slope gradually rises from the side of the ore unloading tunnel to the side of the grid screen, and a plurality of metal rods whose top surfaces are parallel to the slope and extend in the inclined direction are buried at intervals on the slope, and the top surfaces of the metal rods are not lower than the slope.

[0008] Furthermore, one end of the metal rod close to the grid screen is welded to the grid screen or fixedly connected to a connecting rod buried in the vehicle blocking platform.

[0009] Furthermore, a connecting rod with the top exposed is vertically or horizontally buried on one side of the vehicle blocking platform away from the ore unloading tunnel, and one end of the metal rod close to the grating is welded to the connecting rod.

[0010] Furthermore, the top surface of the metal rod close to one end of the ore unloading tunnel is not higher than the bottom surface of the ore unloading chamber.

[0011] Furthermore, the angle between the inclined surface and the bottom surface of the ore unloading chamber is 40-60°, and the spacing between the metal rods on the inclined surface is 50-100 mm.

[0012] Furthermore, the vertical distance from the top of the vehicle blocker to the bottom of the ore unloading chamber is not less than 400 mm or not less than 1 / 3 to 1 / 2 of the height of the tire of the ore unloading vehicle.

[0013] Furthermore, the metal rod is a scrap rail, an I-beam or a channel steel, the metal rod is laid flat along the inclination direction of the slope, and at least the lower part to the middle part of the cross section of the metal rod is buried in the vehicle blocking platform.

[0014] Furthermore, the grating includes a transverse beam consistent with the extension direction of the ore unloading tunnel and a longitudinal beam perpendicular to the transverse beam. The transverse beam is arranged downwardly from one side of the vehicle blocking platform to the other side. One end of the transverse beam is buried in the vehicle blocking platform and the other end is buried in the well ring foundation away from the ore unloading tunnel.

[0015] Furthermore, the transverse beam comprises a horizontal section and an inclined section, wherein the horizontal section is close to the vehicle blocking platform, and the inclined section is away from the vehicle blocking platform and fixedly connected to the horizontal section.

[0016] Furthermore, the top surface of the side of the shaft ring foundation away from the ore unloading tunnel is lower than the bottom surface of the ore unloading chamber.

[0017] Beneficial effects of the utility model:

[0018] 1. The utility model fixes a concrete car-blocking platform on the basis of the shaft ring, and buries a plurality of metal rods on the inclined surface of the car-blocking platform. Through the dual blocking effect of the car-blocking platform and the metal rods, not only is the structure simpler than that of the open-type shaft car-blocking device, but also the blocking effect of the blocker can be effectively exerted, thereby improving the reliability of the blocker. In addition, the metal rods on the inclined surface can also significantly improve the impact resistance and wear resistance of the car-blocking device. Compared with the traditional single concrete platform car-blocking device with a service life of only 4 to 5 months and a chute capacity of 90,000 to 100,000 tons, the service life of the car-blocking device can be increased to 18 to 26 months and a chute capacity of 900,000 to 1,000,000 tons. The service life of the car-blocking device is significantly extended, the maintenance time of the shaft is reduced, and the transportation efficiency of the ore is indirectly improved.

[0019] 2. The car stopper of the utility model is composed of a metal rod buried on the inclined surface of the car stopper. Since it has no moving parts, it is not easy to be damaged and does not require daily maintenance. Moreover, after the metal rod is worn or the surrounding concrete is damaged, it is only necessary to remove the worn metal rod or the damaged local concrete, and then replace the corresponding metal rod or re-pour the concrete to complete the repair without replacing the entire car stopper. Therefore, maintenance is relatively convenient and the maintenance cost is low.

[0020] 3. The metal rods of the car blocker of the utility model are buried in the inclined surface of the car blocker platform. The inclined metal rods can not only adapt to transfer vehicles of different heights and ensure the safety of transfer vehicles of different heights when unloading ore, but also effectively reduce the impact force of the transfer vehicle on the car blocker platform and the friction force on the tires of the transfer vehicle, thereby effectively extending the service life of the car blocker and the tires of the transfer vehicle and achieving the purpose of reducing the comprehensive transfer cost.

[0021] 4. The grating screen of the utility model is composed of a transverse beam and a longitudinal beam, and the transverse beam is inclined downward from one side of the car stop platform to the other side. In particular, the transverse beam is composed of a horizontal section at the front and an inclined section at the rear. Not only can the transverse beam extend and insert into the car stop platform, it can enhance the structural strength and anti-collision ability of the car stop platform, which is beneficial to prolonging the service life of the car stopper and the grating screen; and the horizontal section at the front of the transverse beam can prevent the subsequent unloading of smaller ores from clogging the inlet, and the inclined section at the rear can make large pieces of ore roll to the lower side of the grating screen, thereby facilitating their centralized crushing and avoiding damage to the grating screen.

[0022] In summary, the utility model has the characteristics of simple structure, convenient maintenance, low cost and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the existing mine chute grid screen structure;

[0024] Figure 2 It is a schematic diagram of the structure of the utility model;

[0025] Figure 3 for Figure 2 A magnified image of point A;

[0026] Figure 4 for Figure 2 A top view of

[0027] In the figure: 1- chute, 2- shaft foundation, 3- grating, 31- transverse beam, 311- horizontal section, 312- inclined section, 32- longitudinal beam, 321- connecting beam, 322- lifting beam, 4- unloading tunnel, 5- car blocker, 51- car blocker platform, 52- metal rod, 53- inclined surface, 6- unloading chamber, 7- connecting rod. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited in any way. Any changes or improvements made based on the teachings of the present invention belong to the protection scope of the present invention.

[0029] like Figure 2 , 3 As shown in FIG. 4 , the utility model comprises a chute 1, a well ring foundation 2, and a grating 3. The well ring foundation 2 is a concrete annular casting fixedly arranged at the upper wellhead of the chute 1. The grating 3 covers the upper wellhead of the chute 1 and is buried in the well ring foundation 2 on the outside.

[0030] A car stopper 5 higher than the bottom of the ore unloading chamber 6 is fixedly arranged on the side of the shaft ring foundation 2 facing the ore unloading tunnel 4. The car stopper 5 includes a concrete car stopper platform 51 whose bottom is fixedly connected to the shaft ring foundation 2. A slope 53 is arranged on the side of the car stopper platform 51 facing the ore unloading tunnel 4. The slope 53 gradually rises from the side of the ore unloading tunnel 4 to the side of the grid screen 3. A plurality of metal rods 52 whose top surfaces are parallel to the slope 53 and extend in the inclined direction are buried at intervals on the slope 53. The top surfaces of the metal rods 52 are not lower than the slope 53.

[0031] One end of the metal rod 52 close to the grid screen 3 is welded to the grid screen 3 or fixedly connected to the connecting rod 7 buried in the vehicle blocking platform 51 .

[0032] A connecting rod 7 with the top exposed is vertically or horizontally buried on one side of the vehicle blocking platform 51 away from the ore unloading tunnel 4 , and one end of the metal rod 52 close to the grid screen 3 is welded to the connecting rod 7 .

[0033] The top surface of the metal rod 52 close to one end of the ore unloading tunnel 4 is not higher than the bottom surface of the ore unloading chamber 6.

[0034] The angle between the inclined surface 53 and the bottom surface of the ore unloading chamber 6 is 40-60 degrees, and the spacing between the metal rods 52 on the inclined surface 53 is 50-100 mm.

[0035] The vertical distance from the top of the vehicle blocker 5 to the bottom of the ore unloading chamber 6 is not less than 400 mm or not less than 1 / 3 to 1 / 2 of the height of the tire of the ore unloading vehicle.

[0036] The metal rod 52 is a scrap rail, an I-beam or a channel steel. The metal rod 52 is laid flat along the inclined direction of the inclined surface 53 . At least the lower part to the middle part of the cross section of the metal rod 52 is buried in the vehicle blocking platform 51 .

[0037] The grating 3 includes a transverse beam 31 which is consistent with the extension direction of the ore unloading tunnel 4 and a longitudinal beam 32 which is perpendicular to the transverse beam 31. The transverse beam 31 is arranged to be inclined downward from one side of the vehicle blocking platform 51 to the other side. One end of the transverse beam 31 is buried in the vehicle blocking platform 51 and the other end is buried in the shaft ring foundation 2 away from the ore unloading tunnel 4.

[0038] The transverse beam 31 includes a horizontal section 311 and an inclined section 312 . The horizontal section 311 is close to the vehicle blocking platform 51 , and the inclined section 312 is away from the vehicle blocking platform 51 and fixedly connected to the horizontal section 311 .

[0039] The longitudinal beam 32 includes a connecting beam 321 and a supporting beam 322 . Both ends of the connecting beam 321 are fixedly connected to the adjacent transverse beams 31 , respectively. The supporting beam 322 is fixedly disposed at the bottom of the connecting beam 321 and is disposed horizontally.

[0040] The top surface of the side of the well ring foundation 2 away from the ore unloading tunnel 4 is lower than the bottom surface of the ore unloading chamber 6. Example

[0041] like Figure 2 , 3 As shown in FIG4 , the production process of the mine chute grid screen of the utility model is as follows:

[0042] 1. According to the wellhead size of the chute 1, an I-beam with a specification of I 32a and L = 3600 mm is used as a transverse beam 31 (where the horizontal section 311 is 1500 mm long and the inclined section 312 is 2100 mm long) and a longitudinal beam 32, which are cross-welded to form a grid screen 3.

[0043] 2. A 300mm thick shaft foundation 2 is cast with concrete on the bottom of the unloading chamber 6 (the top surface of the side away from the unloading tunnel 4 is lower than the bottom of the unloading chamber 6, and the top surfaces of the other sides are flush with the bottom of the unloading chamber 6). The concrete strength grade is C20, and both ends of the longitudinal beam 32 and one end of the inclined section 312 are cast in the shaft foundation 2.

[0044] 3. On the side of the well ring foundation 2 facing the unloading tunnel 4, a concrete vehicle stop 51 with a thickness of 400 mm and 500 mm higher than the bottom surface of the unloading chamber 6 is cast, and the side of the vehicle stop 51 facing the unloading tunnel 4 forms an inclined surface 53 with an angle of 50° with the bottom surface of the unloading chamber 6.

[0045] 4. Cut the scrap rails used underground into sections according to the needs of the site (i.e., as metal rods 52, generally cut to a length of 500-1000 mm), and then lay the scrap rails on the inclined surface 53 at intervals of 50-100 mm along the inclined direction, and weld the scrap rails near the grid screen 3 to the top of the connecting rod 7 buried horizontally (not shown in the figure) or vertically in the vehicle blocking platform 51 (the welding length is less than 50 mm).

[0046] 5. The laid and welded scrap rails are poured with concrete along the inclined surface 53, and it is ensured that the top surface of the cross section of the scrap rails is exposed with concrete after pouring. After the concrete pouring, it can be put into use as a mine chute screen after necessary maintenance.

[0047] Before the transformation: A traditional single concrete platform was used as the car stopper. Although the production cycle was short, its service life was generally only 2 to 3 months and the ore chute volume was only 80,000 to 100,000 tons. In addition, the car stopper 5 was easily damaged during the transfer production, posing a greater threat to production safety. The accumulated repair time was too long, which also affected the transfer production efficiency.

[0048] After transformation: The mine chute screen made according to the above embodiment improves the impact resistance and wear resistance of the car blocker 5, especially using scrap rails as the metal rods 52, not only the underground waste materials are recycled and reused, but also the service life after the transformation is increased to 18 to 26 months and the ore chute volume reaches 900,000 to 1 million tons, and the failure frequency of the car blocker 5 is effectively reduced, thereby improving production efficiency, saving transportation production costs and reducing transportation production safety risks.

[0049] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A stable and reliable mine chute screen structure, comprising a chute (1), a well ring foundation (2), and a screen grid (3), wherein the well ring foundation (2) is a concrete ring cast and fixedly arranged at the upper well mouth of the chute (1), and the screen grid (3) covers the upper well mouth of the chute (1) and is buried in the well ring foundation (2) on the outside; It is characterized in that A car blocker (5) higher than the bottom surface of the ore unloading chamber (6) is fixedly arranged on the side of the well ring foundation (2) facing the ore unloading tunnel (4), and the car blocker (5) comprises a concrete car blocker platform (51) whose bottom surface is fixedly connected to the well ring foundation (2), and a slope (53) is arranged on the side of the car blocker platform (51) facing the ore unloading tunnel (4), and the slope (53) gradually rises from the side of the ore unloading tunnel (4) to the side of the grid screen (3), and a plurality of metal rods (52) whose top surfaces are parallel to the slope (53) and extend in the inclined direction are buried at intervals on the slope (53), and the top surfaces of the metal rods (52) are not lower than the slope (53).

2. The stable and reliable mine chute grid screen structure according to claim 1 is characterized in that: One end of the metal rod (52) close to the grid screen (3) is welded to the grid screen (3) or fixedly connected to a connecting rod (7) buried in the vehicle blocking platform (51).

3. The stable and reliable mine chute grid screen structure according to claim 2 is characterized in that: A connecting rod (7) with its top exposed is vertically or horizontally buried on one side of the vehicle blocking platform (51) away from the ore unloading tunnel (4), and one end of the metal rod (52) close to the grating (3) is welded to the connecting rod (7).

4. The stable and reliable mine chute grid screen structure according to claim 2 is characterized in that: The top surface of the metal rod (52) close to one end of the ore unloading tunnel (4) is not higher than the bottom surface of the ore unloading chamber (6).

5. The stable and reliable mine chute grid screen structure according to claim 1 is characterized in that: The angle between the inclined surface (53) and the bottom surface of the ore unloading chamber (6) is 40 to 60 degrees, and the spacing between the metal rods (52) on the inclined surface (53) is 50 to 100 mm.

6. A stable and reliable mine chute grid screen structure according to any one of claims 1 to 5, characterized in that: The vertical distance from the top of the vehicle blocker (5) to the bottom of the ore unloading chamber (6) is not less than 400 mm or not less than 1 / 3 to 1 / 2 of the height of the tire of the ore unloading vehicle.

7. The stable and reliable mine chute grid screen structure according to claim 6 is characterized in that: The metal rod (52) is a waste rail, an I-beam or a channel steel. The metal rod (52) is laid flat along the inclined direction of the inclined surface (53). At least the lower part to the middle part of the cross section of the metal rod (52) is buried in the vehicle blocking platform (51).

8. The stable and reliable mine chute grid screen structure according to claim 6 is characterized in that: The grating (3) comprises a transverse beam (31) extending in the same direction as the unloading tunnel (4) and a longitudinal beam (32) perpendicular to the transverse beam (31); the transverse beam (31) is arranged to be inclined downward from one side of the vehicle blocking platform (51) to the other side; one end of the transverse beam (31) is buried in the vehicle blocking platform (51) and the other end is buried in a well ring foundation (2) away from the unloading tunnel (4).

9. The stable and reliable mine chute grid screen structure according to claim 8 is characterized in that: The transverse beam (31) comprises a horizontal section (311) and an inclined section (312), wherein the horizontal section (311) is close to the vehicle blocking platform (51), and the inclined section (312) is far away from the vehicle blocking platform (51) and is fixedly connected to the horizontal section (311).

10. The stable and reliable mine chute grid screen structure according to claim 8, characterized in that: The top surface of the side of the well ring foundation (2) away from the ore unloading tunnel (4) is lower than the bottom surface of the ore unloading chamber (6).

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