Protection device of coal blocking switch

Abstract

The utility model discloses a protection device of a coal blocking switch. The protection device comprises a coal falling barrel, the coal blocking switch and a protection cover shell. A mounting surface is arranged on the protective cover shell and is correspondingly fixed on the inner wall of the coal dropping barrel; a through hole is formed in the mounting surface, and a probe of the coal blocking switch extends into the protective cover from the through hole; a shielding face is arranged on the top of the protective cover shell, a coal blocking inlet is formed in the bottom of the protective cover shell, and accumulated coal can enter the protective cover shell from the coal blocking inlet to trigger the coal blocking switch. And the shielding surface is obliquely arranged, and gradually inclines downwards in the direction far away from the inner wall of the coal falling barrel, so that coal falling on the shielding surface can slide out under the action of gravity. The coal blocking inlet is obliquely arranged and gradually inclines upwards in the direction away from the inner wall of the coal falling barrel. The anti-misoperation device can prevent misoperation of the coal blocking switch and protect the coal blocking switch from being damaged easily.

Description

Technical Field

[0001] The utility model relates to the technical field of coal blocking switches, in particular to a protection device for a coal blocking switch. Background Art

[0002] The coal transportation system of thermal power plants, coal mine production lines, and ship and train loading and unloading all use multi-stage coal conveyor belts to transport materials. The upper belt is connected to the lower belt by a coal chute. Coal blockage in the coal chute occurs frequently, making it difficult to clean and dredge. At the same time, the overflowing coal flow will scatter along the return belt. In severe cases, it will cause the coal conveyor belt to break, the motor to burn, the auxiliary equipment to be damaged, the transfer station to collapse, and the user to be forced to shut down due to the lack of materials. Accidents with large losses such as coal blockage in the coal chute are the main accidents that plague thermal power plants.

[0003] The existing coal blocking switch is mainly used in the coal hopper of the multi-stage coal conveying system. It has rotating probes and probes inside. When coal blocking materials accumulate and touch or get stuck on the probes, the coal blocking switch is triggered to stop the operation of the upper belt conveyor. This can play a protective role in coal blocking to a certain extent. However, due to the poor coal quality, coal sticks to the inner wall of the coal hopper, causing the switch to operate frequently and the false operation rate is very high, which brings great trouble to the operating personnel. In addition, the coal blocking switch is damaged by the strong impact of falling large pieces of coal or stones and other debris. The switch has an extremely high damage rate, needs to be replaced frequently, and is expensive, which brings great difficulties to the maintenance work. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a protection device for a coal blocking switch, which aims to prevent the coal blocking switch from malfunctioning and protect the coal blocking switch from being easily damaged.

[0005] Technical solution: To achieve the above-mentioned purpose, the utility model provides a protective device for a coal blocking switch, comprising a coal dropping tube, a coal blocking switch and a protective cover shell; a mounting surface is provided on the protective cover shell, and the mounting surface is correspondingly fixed on the inner wall of the coal dropping tube; a through hole is provided on the mounting surface, and a probe of the coal blocking switch extends into the protective cover shell from the through hole; a shielding surface is provided on the top of the protective cover shell, and a coal blocking entrance is provided on the bottom of the protective cover shell, and the accumulated coal can enter the protective cover shell from the coal blocking entrance to trigger the coal blocking switch.

[0006] Furthermore, the shielding surface is arranged obliquely, and the shielding surface gradually tilts downward in a direction away from the inner wall of the coal drop shaft, so that the coal falling on the shielding surface can slide out under the action of gravity.

[0007] Furthermore, the coal blocking inlet is arranged obliquely, and the coal blocking inlet is gradually inclined upward in a direction away from the inner wall of the coal dropping shaft.

[0008] Furthermore, bolt holes are provided on the installation surface, and fixing bolts are correspondingly inserted into the bolt holes to fix the protective cover shell on the inner wall of the coal drop chute.

[0009] Furthermore, the mounting surface is provided with a plurality of bolt holes, and the plurality of bolt holes are arranged in a ring direction with the through hole as the center.

[0010] Furthermore, a groove is provided at the bottom of the mounting surface, and an elastic pad is installed in the groove; when the mounting surface is fixed on the inner wall of the coal drop chute, the elastic pad is in an elastically compressed state.

[0011] Furthermore, the protective cover shell is a horizontal hollow triangular column, and the protective cover shell is composed of an upper baffle plate, a rear mounting plate, and two side plates connecting the baffle plate and the mounting plate; the upper plate surface of the baffle plate is the baffle surface, and the side of the mounting plate facing the coal chute is the mounting surface, and the baffle plate, the mounting plate, and the lower plate edges of the two side plates enclose the coal blocking entrance.

[0012] Beneficial effects: The utility model provides a protective device for a coal blockage switch, with a protective cover shell outside the probe of the coal blockage switch, and a slanted shielding surface on the top of the protective cover shell to prevent large pieces of coal or stones and other debris from falling and damaging the probe of the coal blockage switch; the bottom of the protective cover shell is provided with a slanted coal blockage entrance, and when coal blockage occurs, the accumulated coal can enter the interior of the protective cover shell from the coal blockage entrance to trigger the coal blockage switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 A schematic diagram showing the installation of the protective cover in the coal chute;

[0014] Attached Figure 2 It is a schematic diagram of the structure of the protective cover. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings.

[0016] As attached Figures 1 to 2 The protective device of the coal blocking switch comprises a coal dropping tube 1, a coal blocking switch 2 and a protective cover 3. The protective cover 3 has a mounting surface 4, which is fixed to the inner wall of the coal dropping tube 1. The mounting surface 4 is provided with a through hole 5, and the base of the coal blocking switch 2 is mounted on the outer wall of the coal dropping tube 1. The upper wall of the coal dropping tube 1 has an opening corresponding to the through hole 5, so that the probe 6 of the coal blocking switch 2 can pass through the wall of the coal dropping tube 1 and extend into the protective cover 3 from the through hole 5, so that the protective cover 3 can protect the probe 6 to prevent the probe 6 of the coal blocking switch 2 from being damaged by falling debris such as large pieces of coal or stones, and also to prevent the coal blocking switch 2 from malfunctioning due to falling debris.

[0017] The top of the protective cover 3 is provided with a shielding surface 8, which blocks the falling debris to protect the probe 6. The bottom of the protective cover 3 is provided with a coal blocking entrance 7. When coal blocking occurs, the accumulated coal can enter the protective cover 3 from the coal blocking entrance 7, thereby touching the probe 6 of the coal blocking switch 2, thereby triggering the coal blocking switch 2, so that the coal blocking switch 2 can work normally.

[0018] As attached Figure 1 As shown in the figure, the shielding surface 8 is arranged obliquely, and the shielding surface 8 gradually tilts downward in the direction away from the inner wall of the coal drop shaft 1, so that the coal falling on the shielding surface 8 can slide out under the action of gravity. The inclined shielding surface 8 can guide the coal to slide down to avoid coal accumulation on the shielding surface 8.

[0019] As attached Figure 1 As shown in the figure, the coal blocking entrance 7 is arranged obliquely, and the coal blocking entrance 7 gradually tilts upward in the direction away from the inner wall of the coal drop shaft 1. The inclined coal blocking entrance 7 makes it easier for coal to enter the protective cover 3 when it is accumulated. When coal blockage occurs, the coal blocking switch 2 is easily triggered, thereby reducing the influence of the protective cover 3 on the sensitivity of the coal blocking switch 2.

[0020] As attached Figure 2 As shown in the figure, the mounting surface 4 is provided with a bolt hole 9, and the wall of the coal drop shaft 1 is provided with an opening corresponding to the bolt hole 9. The fixing bolts 10 are correspondingly inserted into the bolt holes 9 and the openings on the wall of the coal drop shaft 1, and the fixing bolts 10 are locked with nuts to fix the protective cover 3 on the inner wall of the coal drop shaft 1. Specifically, the mounting surface 4 is provided with a plurality of bolt holes 9, and the plurality of bolt holes 9 are arranged in a circumferential direction with the through hole 5 as the center, so that the protective cover 3 can be firmly mounted on the coal drop shaft 1.

[0021] As attached Figure 2 As shown in the figure, the bottom of the mounting surface 4 is provided with a groove 11, and the groove 11 is located below the bolt hole 9. Figure 1 As shown in , an elastic pad 12 is installed in the groove 11. When the mounting surface 4 is fixed on the inner wall of the coal drop chute 1, there is a certain gap between the bottom of the mounting surface 4 and the inner wall of the coal drop chute 1, and the elastic pad 12 is in an elastic compression state, so that when the shielding surface 8 is impacted by falling debris, the elastic pad 12 can play a certain buffering role, and the protective cover shell 3 is not easily damaged and dropped by coal blocks, so as to extend the service life of the protective cover shell 3.

[0022] The specific structure of the protective cover 3 is shown in the attached Figure 1As shown in the figure, the protective cover shell 3 is a horizontal hollow triangular column, and the protective cover shell 3 is composed of an upper baffle plate 13, a rear mounting plate 14, and two side plates 15 connecting the baffle plate 13 and the mounting plate 14. The baffle plate 13 and the mounting plate 14 are both rectangular plates, and the two side plates 15 are triangular plates. The upper plate surface of the baffle plate 13 is the baffle surface 8. The side of the mounting plate 14 facing the coal drop chute 1 is the mounting surface 4, and the baffle plate 13, the mounting plate 14, and the lower plate edges of the two side plates 15 enclose the coal blocking entrance 7.

[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A protection device for a coal blocking switch, characterized in that: The invention comprises a coal drop barrel (1), a coal blocking switch (2) and a protective cover (3); the protective cover (3) is provided with a mounting surface (4), and the mounting surface (4) is correspondingly fixed on the inner wall of the coal drop barrel (1); a through hole (5) is provided on the mounting surface (4), and a probe (6) of the coal blocking switch (2) extends into the protective cover (3) through the through hole (5); a shielding surface (8) is provided on the top of the protective cover (3), and a coal blocking inlet (7) is provided on the bottom of the protective cover (3), and accumulated coal can enter the protective cover (3) through the coal blocking inlet (7) to trigger the coal blocking switch (2).

2. A protection device for a coal blocking switch according to claim 1, characterized in that: The shielding surface (8) is arranged obliquely, and the shielding surface (8) gradually tilts downward in a direction away from the inner wall of the coal drop shaft (1), so that the coal falling on the shielding surface (8) can slide out under the action of gravity.

3. A protection device for a coal blocking switch according to claim 1, characterized in that: The coal blocking inlet (7) is arranged obliquely, and the coal blocking inlet (7) gradually tilts upward in a direction away from the inner wall of the coal dropping shaft (1).

4. A protection device for a coal blocking switch according to claim 1, characterized in that: The mounting surface (4) is provided with bolt holes (9), and fixing bolts (10) are correspondingly inserted into the bolt holes (9) to fix the protective cover shell (3) on the inner wall of the coal drop chute (1).

5. A protection device for a coal blocking switch according to claim 4, characterized in that: The mounting surface (4) is provided with a plurality of bolt holes (9), and the plurality of bolt holes (9) are arranged in a circumferential direction with the through hole (5) as the center.

6. A protection device for a coal blocking switch according to claim 1, characterized in that: The bottom of the mounting surface (4) is provided with a groove (11), and an elastic pad (12) is installed in the groove (11); when the mounting surface (4) is fixed on the inner wall of the coal drop chute (1), the elastic pad (12) is in an elastically compressed state.

7. A protection device for a coal blocking switch according to any one of claims 1 to 6, characterized in that: The protective cover shell (3) is a horizontal hollow triangular prism, and is composed of an upper baffle plate (13), a rear mounting plate (14), and two side plates (15) connecting the baffle plate (13) and the mounting plate (14); the upper plate surface of the baffle plate (13) is the baffle surface (8), the side of the mounting plate (14) facing the coal drop chute (1) is the mounting surface (4), and the lower plate edges of the baffle plate (13), the mounting plate (14), and the two side plates (15) enclose the coal blocking entrance (7).

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