Mining flame-proof travel switch

Abstract

The utility model discloses a mining flame-proof travel switch, which belongs to the technical field of switches and comprises a shell, and a cam limit switch is arranged in the shell. A mounting hole is formed in the side wall of the shell, and an explosion-proof bearing seat is arranged in the mounting hole; an explosion-proof shaft sleeve is arranged in the explosion-proof bearing seat; one end of the explosion-proof shaft sleeve extends out to be connected with external equipment, and the other end is connected with a cam main shaft of the cam limit switch; one side of the shell is provided with an explosion-proof wiring cavity, and an explosion-proof wiring terminal is arranged in the explosion-proof wiring cavity; and a cable access sealing sleeve is arranged on the outer wall of the explosion-proof wiring cavity. The utility model mainly aims to limit the number of operation turns of the rotary body and trigger a signal at a certain stroke position, so that a control circuit can judge the working state of the rotary body and make action feedback.

Description

Technical Field

[0001] The utility model belongs to the technical field of switches, in particular to a mine-used explosion-proof travel switch. Background Art

[0002] With the development of China's mechanical equipment industry, market competition pressure is increasing. Our reels need to be used in coal mine heading faces, and some reels must be used in conjunction with travel limit switches. However, among the existing explosion-proof travel limit switches, there is no such product that can limit the rotating body and is used in coal mine heading faces. Utility Model Content

[0003] In response to the above problems, the utility model provides a mining explosion-proof travel switch, the main purpose of which is to limit the number of revolutions of the rotating body. A certain stroke position triggers a signal for the control circuit to judge the working status of the rotating body and make action feedback.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A flameproof travel switch for mining comprises a housing, wherein a cam limit switch is arranged in the housing; a mounting hole is provided on a side wall of the housing, wherein a flameproof bearing seat is provided in the mounting hole; a flameproof shaft sleeve is provided in the flameproof bearing seat; one end of the flameproof shaft sleeve extends for connection with external equipment, and the other end is connected to the cam main shaft of the cam limit switch; a flameproof wiring cavity is provided on one side of the housing, wherein a flameproof wiring terminal is provided in the flameproof wiring cavity; and a cable access sealing sleeve is provided on the outer wall of the flameproof wiring cavity.

[0006] As a further improvement to the above solution, the cam limit switch's cam shaft is equipped with at least four sets of cams at different angles. This design allows the limit switch to be limited at different angles of rotation of the rotating body, increasing the flexibility and adaptability of the limit switch, thereby adapting to a wider range of mechanical equipment and complex working conditions.

[0007] As a further improvement to the above solution, the flameproof sleeve is connected to the cam main shaft via set screws. This connection method provides convenient installation and adjustment. At the same time, the use of set screws ensures a secure connection, preventing loosening during operation, and improving product reliability and safety.

[0008] As a further improvement to the above solution, bearings are provided between the ends of the flameproof bearing seat and the flameproof sleeve. The use of bearings reduces friction and wear, improves the smoothness and efficiency of movement, and also extends the service life and maintenance cycle of the limit switch.

[0009] As a further improvement to the above solution, the flameproof bearing seat and the mounting hole are threadedly connected, and an O-ring is provided at the connection. The threaded connection and the O-ring provide a good sealing effect, effectively preventing the intrusion of external contaminants, while also protecting internal parts from corrosion, enhancing the durability and stability of the product.

[0010] As a further improvement to the above solution, a TC skeleton oil seal is installed between the flameproof bearing seat end and the flameproof shaft sleeve. The TC skeleton oil seal provides additional sealing protection, especially in applications with high pressure and speed. It can effectively prevent lubricant leakage and the intrusion of external contaminants, maintaining the good performance of moving parts such as bearings.

[0011] As a further improvement to the above solution, the housing is provided with a cover; the cover is threadedly connected to the housing, and a sealing ring is provided at the connection. The cover design ensures the integrity and sealing of the limit switch. The use of the threaded connection and sealing ring makes the connection between the housing and the cover more secure and reliable, preventing the external environment from affecting the internal components, and improving the product's protection level.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] This mining flameproof limit switch is designed with the unique requirements of coal mine environments in mind. Through its flameproof design, multi-angle limit switches, convenient installation and adjustment, excellent sealing, and efficient moving component protection, it achieves high safety, high reliability, and a long service life. It is particularly suitable for controlling mechanical equipment in harsh environments such as coal mine headings, effectively improving the safety and efficiency of coal mine production.

[0014] It has the characteristics of simple structure, excellent flameproof performance and wide applicability. In addition to being widely used in the limitation of various types of mine flameproof cables and water pipe reels of our company, it can also meet the limitation needs of various mining rotary structure equipment on the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the assembly diagram of the explosion-proof travel switch for mining.

[0016] Figure 2 for Figure 1 AA cross-sectional structural diagram.

[0017] Figure 3 This is the left view of the explosion-proof limit switch for mining.

[0018] Figure 4 This is a top view of a mine-used explosion-proof travel switch.

[0019] In the figure: 1. Shell cover; 3. Cam limit switch; 4. Flameproof terminal block; 5. Flameproof wiring cavity; 7. Shell; 8. Cable entry seal; 11. Elastic retaining ring for hole; 12. Bearing; 13. O-ring; 14. Flameproof bearing seat; 15. TC skeleton oil seal; 16. Flameproof bushing; 17. Cam shaft. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution, the present invention is described in detail below in conjunction with the embodiments. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present invention.

[0021] like Figure 1-4 As shown, the specific scheme of this embodiment is: a flameproof travel switch for mining, comprising a shell 7, in which a cam limit switch 3 is arranged; a mounting hole is provided on the side wall of the shell 7, in which a flameproof bearing seat 14 is provided; a flameproof shaft sleeve 16 is provided in the flameproof bearing seat 14; one end of the flameproof shaft sleeve 16 extends for connection with external equipment, and the other end is connected to the cam main shaft 17 of the cam limit switch 3; a flameproof wiring cavity 5 is provided on one side of the shell 7, in which a flameproof wiring terminal 4 is provided; a cable access sealing sleeve 8 is provided on the outer wall of the flameproof wiring cavity 5.

[0022] As a preferred embodiment of the above embodiment, at least four groups of cams with different angles are provided on the cam main shaft 17 of the cam limit switch 3 .

[0023] like Figure 4 As shown, as a preferred embodiment of the above embodiment, the flameproof sleeve 16 is connected to the cam main shaft 17 through a set screw.

[0024] like Figure 4 As shown, as a preferred embodiment of the above embodiment, bearings 12 are provided between both ends of the flameproof bearing seat 14 and the flameproof shaft sleeve 16, and a hole elastic retaining ring is also provided between the bottom end of the flameproof bearing seat and the flameproof bearing sleeve.

[0025] like Figure 4 As shown, as a preferred embodiment of the above embodiment, the flameproof bearing seat 14 is connected to the mounting hole by threaded connection, and an O-ring 13 is provided at the connection.

[0026] like Figure 4 As shown, as a preferred embodiment of the above embodiment, a TC skeleton oil seal 15 is provided between the end of the flameproof bearing seat 14 and the flameproof shaft sleeve 16 .

[0027] like Figure 2 As shown, as a preferred embodiment of the above embodiment, a shell cover 1 is provided on the shell 7; the shell cover 1 and the shell 7 are threadedly connected, and a sealing ring is provided at the connection.

[0028] The specific working principle of this utility model:

[0029] In practical applications, the main purpose of this switch is to limit the number of revolutions of the rotating body. A certain stroke position triggers a signal for the control circuit to judge the working status of the rotating body and make action feedback.

[0030] The specific contents are as follows:

[0031] 1. Cam limit switch 3: There are four sets of contacts inside. This part converts the mechanical signal transmitted by the main shaft rotation into an electrical signal.

[0032] 2. Flameproof wiring chamber 5: used for wiring external cables and cam limit switch 3, and plays a flameproof role.

[0033] 3. Housing 7: The cam limit switch 3 is installed therein and a flameproof joint surface is provided to play a flameproof role.

[0034] 4. Cable entry sealing sleeve 8: This part is mainly used to introduce external cables into the wiring cavity.

[0035] 5. Flameproof bearing seat 14: This part is used to ensure that the cam main shaft 17 and the flameproof sleeve 16 are concentric and the transmission is smooth.

[0036] 6. Flameproof sleeve 16: This part is connected to the cam main shaft 17 and is used for cam limit transmission. It is also provided with a flameproof joint surface to play a flameproof role.

[0037] Working principle:

[0038] This device is installed on a reel or other rotating body, and the shell 7 is fixed. A shell cover 1 is provided on the shell 7. A cam limit switch 3 is arranged inside the shell 7. The flameproof sleeve 16 is connected to the main shaft of the rotating body (it can be connected by a coupling, a sprocket, a pulley, etc.). When the rotating body rotates, the flameproof sleeve 16 drives the cam main shaft 17 to rotate synchronously.

[0039] When the reel rotates to retract or unreel, the cam main shaft 17 rotates, driving the cam in the cam limit switch 3 to rotate slowly. When the cam rotates to a certain angle, the micro switch is triggered to generate an electrical signal.

[0040] There are four groups of cams in the cam limit switch 3. The angle of each cam is pre-adjusted, and a signal can be generated when the reel (or rotary body) runs to four different positions, and the four positions of the same reel (or rotary body) can be limited.

[0041] Examples:

[0042] Some models of our company's MA series hose reels have already used this travel limit switch.

[0043] Travel limit switch parameters:

[0044] Rated voltage: 36V

[0045] Rated current: 10A

[0046] Number of cams: four groups

[0047] Power source: shared power source of the rotating body.

[0048] It should be noted that, in this article, the terms include, contain or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Specific examples are used herein to illustrate the principles and implementation methods of the technical solution of the present utility model. The above examples are only used to help understand the method of the present utility model and its core idea. The above is only a preferred embodiment of the present utility model. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present utility model, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should all be regarded as the scope of protection of the present utility model.

Claims

1. A flameproof travel switch for mining, comprising a housing (7), characterized in that: A cam limit switch (3) is provided in the housing (7); a mounting hole is provided on a side wall of the housing (7), and a flameproof bearing seat (14) is provided in the mounting hole; a flameproof shaft sleeve (16) is provided in the flameproof bearing seat (14); one end of the flameproof shaft sleeve (16) extends out for connection with an external device, and the other end is connected to the cam main shaft (17) of the cam limit switch (3); a flameproof wiring cavity (5) is provided on one side of the housing (7), and a flameproof wiring terminal (4) is provided in the flameproof wiring cavity (5); and a cable access sealing sleeve (8) is provided on the outer wall of the flameproof wiring cavity (5).

2. A mine flameproof travel switch according to claim 1, characterized in that: At least four groups of cams with different angles are arranged on the cam main shaft (17) of the cam limit switch (3).

3. A mine flameproof travel switch according to claim 1, characterized in that: The flameproof sleeve (16) is connected to the cam main shaft (17) via a set screw.

4. A mine flameproof travel switch according to claim 1, characterized in that: Bearings (12) are provided between the two ends of the flameproof bearing seat (14) and the flameproof shaft sleeve (16).

5. A mine flameproof travel switch according to claim 1, characterized in that: The flameproof bearing seat (14) is threadedly connected to the mounting hole, and an O-type sealing ring (13) is provided at the connection.

6. A mine flameproof travel switch according to claim 1, characterized in that: A TC skeleton oil seal (15) is provided between the end of the flameproof bearing seat (14) and the flameproof shaft sleeve (16).

7. A mine flameproof travel switch according to claim 1, characterized in that: A shell cover (1) is provided on the shell (7); the shell cover (1) and the shell (7) are threadedly connected, and a sealing ring is provided at the connection.

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