Locking device for coal mine explosion-proof box

Abstract

The present invention relates to a locking device for a coal mine explosion-proof box, comprising a base, a slider, a spring reset button, a rotary handle, a positioning pin, and a connecting sleeve. The base is fixed to the outer side of the cover of the explosion-proof box, the slider is located in the middle of the left-right direction of a groove on the bottom surface of the base, the button is mounted on the base, the inner end of the button core shaft passes through the base and is fixed to the slider, the connecting sleeve vertically penetrates the cover and is embedded and fixed on the cover, the rotary handle is mounted on the outer side of the cover, the inner end of the rotating shaft of the rotary handle passes through the connecting sleeve and cantilevers outward from the inner side of the explosion-proof box, the rotating shaft is rotatably connected to the connecting sleeve, one end of the positioning pin is fixed to the rotary handle, and the other end cantilevers outward and extends into the groove and the left and right local groove spaces of the slider. When the button is in the maximum pressing state, the slider is closer to the cover than the positioning pin. The present invention can quickly control the electrical control components in the box and conveniently and quickly achieve reliable locking of the operated state to prevent misoperation.

Description

Technical Field

[0001] The present invention relates to a locking device for a flameproof box, in particular to a locking device for a flameproof box used for installing an isolating switch in an underground coal mine. Background Art

[0002] Since coal mines use mechanized mining, a large number of electrical control components are required. In order to protect these electrical control switches from the influence of gas and other factors, these electrical switches must be installed in explosion-proof boxes to ensure coal mine production safety.

[0003] The closing and opening operations of the disconnector are performed outside the box. To prevent accidental operation, the handle must be locked with a lock after it is moved to the closing or opening position. Currently, the handle is locked with a conventional lock, which ensures safety but is difficult to unlock. Summary of the Invention

[0004] The present invention aims to provide a locking device for a coal mine explosion-proof box, which can quickly control the electrical control components in the box without removing the cover of the explosion-proof box, and conveniently and quickly realize reliable locking of the state after operation, thereby preventing misoperation and ensuring the safety of electricity use in coal mines.

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

[0006] A locking device for a coal mine explosion-proof box, comprising a base, a slider, a spring reset button, a rotating handle, a positioning pin and a connecting sleeve, wherein the bottom surface of the base is fixedly mounted on the outer surface of the cover plate of the explosion-proof box, a groove is provided on the bottom surface of the base, the slider is located in the middle of the left and right directions of the groove, the spring reset button is mounted on the top surface of the base, the inner end of the core shaft of the spring reset button passes through the base and is fixedly connected to the slider, the slider reciprocates in a direction perpendicular to the surface of the cover plate under the pressing operation of the spring reset button, the connecting sleeve vertically penetrates the cover plate and is embedded and fixed on the cover plate, the rotating handle is mounted on the outer surface of the cover plate, and the inner end of the rotating shaft of the rotating handle The connecting sleeve is cantilevered over the inner side of the explosion-proof box, and the rotating shaft is rotatably connected to the connecting sleeve. No groove wall is provided on the side of the groove close to the rotating handle. One end of the locating pin is fixed on the rotating handle, and the other end is cantilevered outward along the radial direction of the rotating handle and extends into the groove. When the spring reset button is in a relaxed state, the slider is close to the bottom of the groove, and two local groove spaces are formed between the left and right side walls of the slider and the left and right side walls of the groove respectively. The two extreme working positions of the rotating shaft correspond one to one with the locating pins inserted into the above-mentioned two local groove spaces. When the spring reset button is in the maximum pressing state, the slider as a whole is closer to the cover plate side than the locating pin.

[0007] At least one side surface of the slider contacts a side wall of the groove.

[0008] A side surface of the sliding block close to the rotating handle may be flush with a corresponding side surface of the base.

[0009] A side surface of the base close to the rotating handle is preferably configured as a concave arc cylinder.

[0010] Furthermore, the arc cylindrical surface of the base and the rotating handle are coaxially arranged, and a gap is reserved between them.

[0011] The base may be provided with an opening and closing state indication mark.

[0012] The spring reset button may further include a button cap, a spring, a fixing pin and a base, wherein the spring and the base are both sleeved on the core shaft, the fixing pin radially passes through the outer end of the core shaft, the two ends of the spring are abutted between the fixing pin and the base, the fixing pin, the spring and most of the core shaft are installed in the button cap, and under normal circumstances, the button cap and the base are kept connected by an anti-disengagement structure, the inner diameter of the button cap is larger than the diameter of the base, and the base is fixed on the top surface of the base.

[0013] The beneficial effects of the present invention are:

[0014] The present invention can quickly complete the control operation of electrical control elements in the box, such as disconnectors, without removing the flameproof box cover, and conveniently and quickly realize reliable locking of the state after operation, thereby preventing misoperation and ensuring the safety of electricity use in coal mines.

[0015] The invention has a simple structure, is easy and quick to operate, and has good safety, and is very suitable for the application environment of the explosion-proof box.

[0016] The present invention can also be extended to all occasions involving rapid switching between multiple positions and requiring rapid and reliable locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a front view of an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Right view of .

[0019] Reference numerals:

[0020] 1. Slider; 2. Base; 2-1. Groove; 3. Spring return button; 3-1. Core shaft; 3-2. Button cap; 3-3. Spring; 3-4. Fixing pin; 3-5. Base; 6. Connecting sleeve; 7. Positioning pin; 8. Rotating handle; 9. Open / Close status indicator; 10. Cover. DETAILED DESCRIPTION

[0021] The present invention discloses a locking device for a coal mine explosion-proof box, such as Figure 1 、 2As shown, it includes a base 2, a slider 1, a spring reset button 3, a rotating handle 8, a positioning pin 7 and a connecting sleeve 6. The bottom surface of the base is fixedly mounted on the outer surface of the cover 10 of the explosion-proof box. A groove 2-1 is provided on the bottom surface of the base, and the notch is located on the bottom surface of the base. The slider is located in the middle of the groove in the left and right directions. The spring reset button is mounted on the top surface of the base, and the inner end of the core shaft 3-1 of the spring reset button passes through the base and is fixedly connected to the slider. The slider can move back and forth in a direction perpendicular to the cover surface under the pressing operation of the spring reset button. The connecting sleeve vertically passes through the cover plate and is embedded and fixed on the cover plate. The rotating handle is installed on the outer surface of the cover plate. The inner end of the rotating shaft of the rotating handle can pass through the connecting sleeve and cantilever to the inner side of the explosion-proof box. It is used to connect with the actuator of the electrical control element to be operated (such as the rotating shaft of the disconnector). It can be directly connected or indirectly connected through other parts such as the shaft and sleeve. In short, the rotating handle and the rotating shaft of the disconnector must be able to rotate coaxially and synchronously, thereby realizing that the disconnector can be closed or opened by turning the rotating handle from outside the explosion-proof box. The rotating shaft is rotatably connected to the connecting sleeve. The connecting sleeve is fixed relative to the box body, and the rotating shaft of the rotating handle can rotate freely relative to the connecting sleeve. The rotating shaft of the rotating handle and the rotating shaft of the disconnector can be coaxially connected by a mortise and tenon structure. No groove wall is provided on the side of the groove close to the rotating handle. One end of the locating pin is fixed to the rotating handle, and the other end cantilevers outward along the radial direction of the rotating handle and extends into the groove from the side of the base close to the rotating handle. When the spring reset button is in a relaxed state, the slider is close to the bottom of the groove, and two local groove spaces are formed between the left and right side walls of the slider and the left and right side walls of the groove, respectively. The two extreme working positions of the rotating shaft correspond to the positioning pins inserted into the above-mentioned two local groove spaces. The two local groove spaces are used to limit the positioning pins to ensure that the angular position of the rotating handle remains unchanged, thereby locking the handle position, preventing misoperation, and ensuring the safety of coal mine electricity. When the spring reset button is in the maximum pressing state, the slider is close to the notch of the groove, and is closer to the cover plate than the positioning pin as a whole, so that the positioning pin can switch from one local groove space to another local groove space in the groove under the drive of the rotating handle. These two local groove spaces correspond to the two extreme working positions of the rotating shaft of the disconnector, and also correspond to the closed and open states of the disconnector, respectively.

[0022] Generally, the sum of the thickness of the slider in a direction perpendicular to the cover plate surface and the diameter of the positioning pin should be less than the depth of the groove. However, this restriction does not apply if the base and the rotary handle are installed on different planes with a height difference.

[0023] The base 2, slider 1, and spring return button 3 form the main portion of the locking mechanism, while the rotary handle 8, positioning pin 7, and connecting sleeve 6 form the main portion of the rotating mechanism. The locking mechanism and rotating mechanism are independent of each other, and the two are connected by the movement and position locking of the positioning pin within the groove of the base.

[0024] This device is installed on the cover of the explosion-proof box. The shaft of the rotary handle is connected to the electrical control components inside the box, especially the isolating switch. The power supply and power-off operation of the coal mining machinery and equipment are realized by operating the rotary handle. When performing power supply and power-off operations on mechanical equipment in coal mines, it is necessary to use both hands to cooperate to complete the operation. The operation method of this device is: press the spring reset button 3 with one hand to compress the built-in spring so that the slider is pressed against the cover, releasing the movement space for the positioning pin 7, and turn the rotary handle 8 with the other hand to a preset position (i.e., corresponding to one of the two local groove spaces mentioned above), and then release the spring reset button 3. The slider 1 resets following the spring reset button, and the slider 1 moves away from the cover again, forming the two local groove spaces mentioned above again, locking the positioning pin 7 in the preset position. In this way, a power supply or power-off operation is completed without opening the cover of the explosion-proof box.

[0025] At least one side of the slider can contact a side wall of the groove to provide guidance and support for the reciprocating movement of the slider. In the embodiment shown in the drawings, two adjacent side surfaces of the slider each maintain contact with a side wall of the groove.

[0026] The side of the slider near the rotating handle can be flush with the corresponding side of the base. Of course, the slider is allowed to slightly protrude beyond the corresponding side of the base while ensuring that the slider does not interfere with the rotating handle. The slider is also allowed to slightly retract into the corresponding side of the base while ensuring that the left and right sides of the slider are effectively restrained by the positioning pins.

[0027] A side surface of the base close to the rotating handle is preferably configured as a concave arc cylinder.

[0028] Furthermore, the arc cylindrical surface of the base can be coaxially arranged with the rotating handle, with a small gap reserved therebetween to ensure smooth rotation of the rotating handle.

[0029] The base can also be provided with an opening and closing state indicator mark 9. The opening and closing state indicator mark in the embodiment shown in the accompanying drawings is located on the top surface of the base, near the edge of the rotating handle, and is marked with clockwise and counterclockwise turning arrows and "open" and "closed" text marks at the turning end positions, respectively representing the opening and closing states of the controlled disconnector. With this opening and closing state indicator mark, even after the comprehensive mining mechanical equipment has been working continuously for several hours underground, the operator can still conveniently and intuitively judge the energized state of the equipment by observing the opening and closing state mark 9, thereby ensuring the correctness of the next operation and further improving the safety of electricity use in coal mines.

[0030] In this embodiment, in addition to the core shaft, the spring reset button may also include a button cap 3-2, a spring 3-3, a fixing pin 3-4, and a base 3-5. The spring and base are both mounted on the core shaft. The fixing pin radially extends through the outer end of the core shaft, and the ends of the spring abut between the fixing pin and the base. The fixing pin, spring, and the majority of the core shaft are mounted within the button cap. The inner diameter of the button cap is larger than the diameter of the base. Normally, the button cap and base are connected by an anti-disengagement structure, such as a radially extending flange provided on the top edge of the base to hook onto the inner rib of the bottom edge of the button cap from the inside. The bottom surface of the base is fixed to the top surface of the base. When the spring reset button is pressed, the spring 3-3 is forced to compress, causing the button cap to move the core shaft toward the cover plate, pushing the slider toward the cover plate, and providing a movement path for the positioning pin 7 to switch from one preset position to another. After the spring reset button is released, the spring resets, pushing the button cap, the core shaft and the slider to reset together, the motion channel is closed, and the slider cooperates with the groove wall of the groove to re-lock the positioning pin.

[0031] The present invention can quickly complete the opening and closing operations of the isolating switch in the box without removing the flameproof box cover, and prompt the current energized state through the opening and closing state mark, thereby preventing misoperation and ensuring the safety of electricity use in coal mines.

[0032] The structure of the present invention can also be used in non-coal mine explosion-proof boxes, and can be used in any occasion where it is necessary to lock the actuator in a specific position to prevent misoperation.

[0033] The left and right, inside and outside, top and bottom in this article are relative concepts in pairs. Left and right are used to distinguish the two positions formed by the slider dividing the internal space of the groove. They are not expressions of absolute positions. The direction of inside and outside refers to the inside of the explosion-proof box, and the opposite is outside. The "top" and "bottom" of a single part refer to the parts of the part located on the outside of the explosion-proof box, away from and close to the cover respectively.

Claims

1. A locking device for a coal mine explosion-proof box, characterized in that: The invention comprises a base, a slider, a spring reset button, a rotating handle, a positioning pin and a connecting sleeve, wherein the bottom surface of the base is fixedly mounted on the outer side of the cover plate of the explosion-proof box, a groove is provided on the bottom surface of the base, the slider is located in the middle of the left and right directions of the groove, the spring reset button is mounted on the top surface of the base, the inner end of the core shaft of the spring reset button passes through the base and is fixedly connected to the slider, and the slider reciprocates in a direction perpendicular to the surface of the cover plate under the pressing operation of the spring reset button, the connecting sleeve vertically penetrates the cover plate and is embedded and fixed on the cover plate, the rotating handle is mounted on the outer side of the cover plate, the inner end of the rotating shaft of the rotating handle passes through the connecting sleeve and is cantilevered to the inner side of the box body of the explosion-proof box, and the rotating shaft and the connecting sleeve rotate The cam is connected to the rotary handle by a spring, and the cam is fixed to the rotary handle at one end, and the other end is cantilevered outwardly in the radial direction of the rotary handle and extends into the groove. The sum of the thickness of the slider in the direction perpendicular to the cover plate surface and the diameter of the cam should be less than the depth of the groove. When the spring reset button is in a relaxed state, the slider is close to the bottom of the groove, and two local groove spaces are formed between the left and right side walls of the slider and the left and right side walls of the groove respectively. The two extreme working positions of the rotating shaft correspond one to one with the insertion of the cam into the above-mentioned two local groove spaces. When the spring reset button is in a maximum pressed state, the slider as a whole is closer to one side of the cover plate than the cam.

2. The locking device for a coal mine explosion-proof box according to claim 1, characterized in that: At least one side surface of the slider contacts a side wall of the groove.

3. The locking device for a coal mine explosion-proof box according to claim 2, characterized in that: A side surface of the sliding block close to the rotating handle is flush with a corresponding side surface of the base.

4. The locking device for a coal mine explosion-proof box according to claim 3, characterized in that: A side surface of the base close to the rotating handle is configured as an inwardly concave arc cylinder.

5. The locking device for a coal mine explosion-proof box according to claim 4, characterized in that: The arc cylindrical surface of the base and the rotating handle are coaxially arranged, and a gap is reserved between them.

6. The locking device for a coal mine explosion-proof box according to claim 1, 2, 3, 4 or 5, characterized in that: The base is provided with an opening and closing state indicating mark.

7. The locking device for a coal mine explosion-proof box according to claim 1, 2, 3, 4 or 5, characterized in that: The spring reset button also includes a button cap, a spring, a fixing pin and a base. The spring and the base are both sleeved on the core shaft. The fixing pin radially passes through the outer end of the core shaft. The two ends of the spring are abutted between the fixing pin and the base. The fixing pin, spring and most of the core shaft are installed in the button cap. Under normal circumstances, the button cap and the base are kept connected by an anti-disengagement structure. The inner diameter of the button cap is larger than the diameter of the base. The base is fixed on the top surface of the base.

8. The locking device for a coal mine explosion-proof box according to claim 6, characterized in that: The spring reset button also includes a button cap, a spring, a fixing pin and a base. The spring and the base are both sleeved on the core shaft. The fixing pin radially passes through the outer end of the core shaft. The two ends of the spring are abutted between the fixing pin and the base. The fixing pin, spring and most of the core shaft are installed in the button cap. Under normal circumstances, the button cap and the base are kept connected by an anti-disengagement structure. The inner diameter of the button cap is larger than the diameter of the base. The base is fixed on the top surface of the base.

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