Mine belt conveyor safety controller

Abstract

The application discloses a mine belt conveyor safety controller, which is characterized in that a switch touch block is arranged in the middle of the controller shell, a micro switch is arranged on one side of the switch touch block, and the micro switch is in an open state when not in action; one pull rod is arranged on each side of the switch touch block, one end of the pull rod is connected with a pull rope through the controller shell, the other end of the pull rod is connected with one end of a pull rod spring, and the other end of the pull rod spring is connected with one side of the switch touch block; a limiting recess is arranged on the upper end face of the switch touch block, a reset rod is arranged on the limiting recess, and a reset spring is sleeved on the reset rod; when the switch touch block slides to any side, the side groove of the switch touch block moves along, the micro switch is closed and a safety early warning signal is sent; when the safety problem is solved, the reset rod is lifted, the switch touch block and the pull rod return to the initial position under the pulling force of the pull rod spring on the other side, the micro switch returns to the open state, and the controller is in a standby early warning state.

Description

Technical Field

[0001] This invention relates to a safety controller for mining belt conveyors, belonging to the technical field of mining safety equipment. Background Technology

[0002] There are two main types of protective control mechanisms for mining products: a double-reset mechanism and a single-reset mechanism. Double-reset mechanisms have a set of microswitches on each side, controlled by corresponding pulling and reset mechanisms. This structure requires the installation of two sets of microswitches and related accessories, resulting in a larger product size, installation difficulties, and significantly increased costs. Some manufacturers have omitted the sealing mechanism to reduce size, making the internal electronic components highly susceptible to moisture damage, posing a significant safety hazard to underground equipment. Single-reset mechanisms have a complex structure, typically using a series of transmission mechanisms to actuate the switches. They also require extremely high concentricity of the pulling mechanisms on both sides. These products are also larger and require much greater pulling force than double-reset mechanisms, greatly increasing product cost and operational difficulty. Furthermore, because the left and right sides of a single-reset mechanism are interconnected, if the steel wire ropes on both sides are pulled too tight during use, they will interfere with each other, preventing effective protection for underground workers.

[0003] To address these issues, patent CN201711227532.9 describes a mine safety control mechanism. In operation, pulling a pull ring 1 on one side via a wire rope causes the corresponding rotating plate 6 to rotate under the influence of a pull rod 2. When pulled to a certain position, the hooks in front of the rotating plate 6 cross and engage with the support column on the middle slider 9. As the wire rope continues to pull, the middle slider 9 moves towards the side pulled by the wire rope, simultaneously disengaging from the rotating plate 6 on the other side and becoming unaffected by the pulling mechanism on that side. Upon reaching a designated position, the slider 9 triggers a microswitch 12, closing and sending a protection signal to the conveyor belt's integrated protection system. Simultaneously, a reset rod 14 moves downwards under spring pressure, locking the slider 9 in place by a thin shaft at the front end of the reset rod 14. When the equipment malfunction is resolved, lifting the reset rod 14 releases the slider 9 from its locked state, and the microswitch 12 returns to its original position. To cancel the locking function, lift the reset rod 14 to the top and tighten the locking bolt 22 on the reset rod guide sleeve 18. The reset rod 14 is locked, allowing the slider 9 mechanism below to move when pulled and automatically reset when pulling stops. The pull rods 2 on both sides are held in place by the springs 4, preventing the slider 9 from moving left or right. The fixed plate 10 has two rotating shafts 11, each with a step at the top and a bushing underneath to prevent the slider 9 from moving up and down or tilting to the side after assembly. The rotating plates 6 on both sides have a waist-shaped hole through which they are connected to the pull rod 2 via a pin 8, allowing them to move freely with the pull rod 2. When not pulled, the rotating plates 6 on both sides remain open. When one side of the wire rope is pulled, the rotating plate 6 on that side moves accordingly, causing the slider 9 to move in the same direction, while the rotating plate 6 on the other side remains stationary and completely disengaged from the slider 9, preventing interference between the left and right pulling mechanisms. There is a bushing on the outside of the rotating plate shaft 7. The rotating plate 6 is fitted onto the bushing and then pressed with screws to ensure that the rotating plate 6 can rotate freely. There is a round hole on the upper side of the reset rod 14. There is a locking bolt 22 on the reset rod guide sleeve 18. The protective ring on the housing 21 has a round hole at the position corresponding to the locking bolt 22. When the screw is screwed into the round hole, the reset rod 14 is fixed on the upper side, and the product releases the locking function.

[0004] Most existing mine safety control mechanisms on the market have a structure with a pulling device on each of the left and right sides and a reset device in the middle. According to user feedback, during operation, the pulling devices on both sides move the reset device, which in turn triggers a microswitch to close, issuing a safety warning signal. However, this mechanism's microswitch can only be a non-roller type. After a period of use, the switch contacts gradually wear down, eventually causing the microswitch to fail to operate after the reset device moves down, posing a significant safety hazard. Furthermore, the complex internal structure requires more components, increasing vulnerable areas and safety risks, and significantly raising production costs. To solve these problems, further research and development of new products is needed. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the current technology and provide a safety controller for mining belt conveyors. It has stable and reliable operation, avoids wear of switch contacts, and has a simple structure and is easy to assemble. It can not only improve underground safety in coal mines, but also reduce production costs, achieving two goals at once.

[0006] To achieve the above objectives, the technical means adopted in this invention is as follows: a safety controller for a mining belt conveyor, comprising a controller housing, a switch trigger block disposed in the middle of the controller housing, and a micro switch disposed on one side of the switch trigger block, which is normally open when not activated; a pull rod disposed on each side of the switch trigger block, one end of the pull rod passing through the controller housing and connected to a pull rope, the other end of the pull rod being connected to one end of a pull rod spring, and the other end of the pull rod spring being connected to one side of the switch trigger block; the action of the pull rod on either side will cause the switch trigger block to move through the pull rod spring on that side, triggering the micro switch; at this time, the pull rod spring on the other side acts as a reset mechanism; when the switch trigger block is activated... A limiting groove is formed inward on the upper end of the moving block. A protrusion higher than the two sides is set in the middle of the limiting groove to form a door frame-shaped groove structure. A reset rod is set on the limiting groove, and a reset spring is sleeved on the reset rod. When not in motion, the lower end face of the reset rod is pressed against the central protrusion in the limiting groove. When in motion, the switch contact block slides to either side, and the lower part of the reset rod falls into the limiting hole on the opposite side of the limiting groove. The switch contact block pushes the micro switch to close and send a safety warning signal. When the safety problem is resolved, the reset rod is lifted, and the switch contact block and the pull rod will return to the initial position under the pull force of the pull rod spring on the other side. The micro switch returns to the normally open state, and the controller is in the waiting warning state.

[0007] Furthermore, the switch actuation block is provided with a groove on one side corresponding to the micro switch, and a roller is provided on the actuating arm of the micro switch. When the micro switch is not activated, the roller is located in the groove.

[0008] Furthermore, the switch actuation blocks are symmetrically arranged, and the groove is located in the middle of the side of the switch actuation block.

[0009] Furthermore, the groove cross-section on the side of the switch trigger block is trapezoidal, and the trapezoid is an isosceles trapezoid with the bottom edge of the groove being the short base.

[0010] Furthermore, a switch actuation block travel groove is provided in the middle of the inner bottom surface of the controller housing, the lower part of the switch actuation block is located in the switch actuation block travel groove, and a pull rod travel groove is provided on each side of the switch actuation block travel groove. A travel limit hole is opened on the pull rod, and the travel limit rod is installed in the travel limit hole with the lower part of the travel limit rod located in the pull rod travel groove.

[0011] Furthermore, the lower two sides of the switch actuation block have recessed openings that match the protrusions on both sides of the travel groove of the switch actuation block.

[0012] Furthermore, each of the pull rod and the switch actuation block is provided with a socket, wherein the socket on the pull rod partially coincides with the travel limit hole on the pull rod, and one end of the pull rod spring is inserted into the socket and sleeved on the travel limit rod; a fixing pin hole is provided on the switch actuation block, the socket on the switch actuation block partially coincides with the fixing pin hole on the switch actuation block, the other end of the pull rod spring is inserted into the socket on the switch actuation block, the pin is inserted into the fixing pin hole, and the pull rod spring is sleeved on the pin.

[0013] Furthermore, the controller housing includes a main body shell and a sealing cover. A raised edge is provided on the top surface of the main body shell, and a groove corresponding to the raised edge is provided on the sealing cover for fastening. A sealing gasket may or may not be provided in the groove, and the two are connected through threaded holes provided on the sealing cover and the main body shell.

[0014] Furthermore, some or all of the travel limiting holes on the pull rod are set as threaded holes, and the travel limiting rod is provided with threads that cooperate with the threaded holes.

[0015] Furthermore, the reset spring sleeved on the reset rod is a compression spring.

[0016] Furthermore, the reset rod is inserted into the reset hole provided on the sealing cover, and the reset spring is mounted on the reset rod, with one end connected to the reset rod and the other end connected to the sealing cover. It can be disassembled along with the cover without affecting the internal structure of the housing, greatly facilitating wiring and maintenance during use.

[0017] The beneficial technical effects of this invention are as follows: The structure is simple, utilizing the threaded connection and threaded hole on the travel limit rod for connection. A fixing bolt is inserted into the pull rod spring and screwed in. A fixing pin hole and pin rod on the switch contact block are sufficient to fix the pull rod spring, eliminating the need for additional components. Installation is simple and convenient. A groove is provided on the side of the switch contact block, and this groove is an isosceles trapezoid with a shorter bottom edge, which engages with the roller of the micro switch, avoiding wear on the switch contacts. The reset rod is inserted into the reset hole on the sealing cover, and the reset spring assembly is on the reset rod. It can be disassembled along with the cover without affecting the internal structure of the housing, greatly facilitating wiring and maintenance during use. The travel groove inside the housing not only serves as a limit switch but also ensures the correct installation position. The design is simple and ingenious, the operation is stable and reliable, it avoids wear on the switch contacts, and assembly is convenient. This not only improves safety in coal mines but also reduces production costs. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention with the sealing cap removed.

[0019] In the diagram: 1. Pull rod, 2. Pull rod spring, 3. Travel limit rod, 4. Switch contact block, 5. Pin, 6. Reset rod, 7. Reset spring, 8. Micro switch, 9. Main body shell, 10. Sealing cover. Detailed Implementation

[0020] like Figure 1 , 2 The safety controller for the mining belt conveyor shown includes a main housing 9. A travel groove is provided in the center of the main housing 9 to accommodate a switch contact block 4, serving as the travel groove for the switch contact block. The lower sides of the switch contact block 4 have recessed openings that match the protrusions on both sides, so that the travel stops when they come into contact. A pull rod travel groove is provided on each side of the switch contact block travel groove in the center of the main housing 9. A pull rod 1 is inserted into each side of the main housing 9, and the two pull rods 1 are symmetrically arranged on both sides of the switch contact block 4, each connected to the switch contact block 4 via a pull rod spring 2.

[0021] As a preferred design, a socket is provided at the junction of the pull rod 1 and the pull rod spring 2. A threaded hole is provided on the pull rod, which is perpendicular to the socket and coincides with it. In this way, during assembly, the mounting ring at one end of the pull rod spring 2 can be inserted into the socket, and then a travel limit rod 3 is inserted through the threaded hole and the socket for screwing and fixing. The travel limit rod 3 can be directly selected as a fixing bolt, which is installed on the threaded hole and protrudes from the bottom. No other parts are required, making the installation simple and convenient. At the same time, the protruding part of the screw cooperates with the pull rod travel groove of the main housing 9 and can be used as a limit rod.

[0022] The switch contact block 4 has slots on both sides corresponding to the pull rod positions for installing the other end mounting ring of the pull rod spring 2. The switch contact block 4 has pin holes corresponding to the slots. The pin 5 is inserted into the pin hole from top to bottom, then through the slot and the other end mounting ring of the pull rod spring 2, and then through the lower pin hole to fix the pull rod spring 2. Both ends of the switch contact block 4 are designed with slots for installing the pull rod spring 2. During assembly, the hook of the pull rod spring 2 is inserted into the slot of the switch contact block 4, and then the pin 5 is installed to fix the pull rod spring (2). The installation is extremely simple and the structural design is also simple, but the function can be guaranteed.

[0023] In its initial state, the switch actuation block 4 is located in the middle of the main housing 9, and the micro switch 8 is mounted on the main housing 9 to one side of the switch actuation block 4. The switch actuation block 4 has a groove on the side corresponding to the micro switch 8. When not in operation, the micro switch 8 remains open. During operation, pulling either pull rod 1 causes the switch actuation block 4 to move to that side under the action of the pull rod spring 2, while the pull rod spring 2 on the other side is simultaneously stretched. When the switch actuation block 4 reaches the limit point of the limiting groove in the main housing 9, its stroke reaches its maximum value. At this time, the reset rod 6 moves downward under the action of the reset spring 7, and the lower shaft of the reset rod 6 falls into the deep hole inside the switch actuation block 4, locking it in place and fixing the position of the switch actuation block 4. At this point, the edge of the groove on the side of the switch actuation block 4 is in close contact with the micro switch 8, forcing it to close and sending a safety warning signal. When the safety issue is resolved, lifting the reset rod 6 causes the switch contact block 4 and pull rod 1 to return to their initial positions under the pull of the spring 2 on the other side. The micro switch 8 returns to its normally open state, and the mine safety control mechanism is in a standby warning state. The groove on the side of the switch contact block 4 has a trapezoidal structure, which allows for perfect integration with the micro switch 8 with rollers, avoiding wear on the switch contacts. The connection of the micro switch 8 is not specifically described here; the circuit board is installed inside the main housing 9, and the micro switch 8 is connected to it. This is not an innovation of the present invention and belongs to existing technology.

[0024] The reset spring 7 below the reset rod 6 is a compression spring. When the mine safety control mechanism issues a safety warning, it must be manually lifted to release the warning, which effectively prevents the mechanism from automatically resetting during the safety warning process and causing a safety accident. The reset rod 6 and the reset spring 7 are installed separately on the sealing cover 10 and can be disassembled together with the sealing cover 10 without affecting the internal structure of the housing, which greatly facilitates wiring and maintenance during use.

[0025] Based on the description of the embodiments and the design in the figures, it can be seen that the design structure of the present invention is simple. It utilizes the threaded connection and threaded hole on the travel limit rod for connection, and the fixing bolt is inserted into the pull rod spring and screwed in. The switch contact block has a fixing pin hole and pin rod to fix the pull rod spring, eliminating the need for additional components. Installation is simple and convenient. A groove is provided on the side of the switch contact block, and this groove is an isosceles trapezoid with the short bottom edge, which engages with the roller of the micro switch, avoiding wear on the switch contacts. The reset rod is inserted into the reset hole on the sealing cover, and the reset spring assembly is on the reset rod. It can be disassembled along with the cover without affecting the internal structure of the housing, greatly facilitating wiring and maintenance during use. The travel groove inside the housing not only serves as a limit switch but also ensures the installation position. The design is simple and ingenious, the operation is stable and reliable, it avoids wear on the switch contacts, and assembly is convenient. This not only improves safety in coal mines but also reduces production costs.

Claims

1. A safety controller for a mining belt conveyor, comprising a controller housing, characterized in that: A switch actuation block is located in the middle of the controller housing. A microswitch is located on one side of the switch actuation block, and is normally open when not activated. A pull rod is located on each side of the switch actuation block. One end of the pull rod extends through the controller housing and connects to a pull rope; the other end of the pull rod connects to one end of a pull rod spring. The other end of the pull rod spring connects to one side of the switch actuation block. Action of the pull rod on either side will activate the switch actuation block via the pull rod spring on that side, triggering the microswitch. At this time, the pull rod spring on the other side acts as a reset mechanism. A limiting groove is formed inward on the upper end of the trigger block. A protrusion higher than the sides is provided in the middle of the limiting groove, forming a door-frame shaped groove structure. A reset rod is provided on the limiting groove, and a reset spring is sleeved on the reset rod. When not in operation, the lower end face of the reset rod is pressed against the central protrusion in the limiting groove. When in operation, the switch trigger block slides to either side, and the lower part of the reset rod falls into the limiting hole on the opposite side of the limiting groove. The switch trigger block pushes the micro switch to close and sends a safety warning signal. After the safety issue is resolved, the reset rod is lifted, and the switch trigger block... The lever returns to its initial position under the tension of the spring on the other side, the microswitch returns to its normally open state, and the controller is in a standby warning state; the switch actuation block has a groove on one side corresponding to the microswitch, and a roller is provided on the actuating arm of the microswitch, and the roller is located in the groove when the microswitch is not activated; the switch actuation blocks are symmetrically arranged, and the groove is located in the middle of the side of the switch actuation block; the cross-section of the groove on the side of the switch actuation block is trapezoidal, and the trapezoid is an isosceles trapezoid, with the side of the bottom surface of the groove being the shorter side; the controller housing includes a main shell and a seal. The cover has a raised edge on the top surface of the main shell, and a corresponding groove on the sealing cover for fastening. A sealing gasket may or may not be provided in the groove, and the cover and the main shell are connected through threaded holes. The travel limit hole on the pull rod is partially or entirely threaded, and the travel limit rod is threaded to engage with the threaded hole. The reset spring sleeved on the reset rod is a compression spring. The reset rod is inserted into the reset hole on the sealing cover, and the reset spring sleeve is on the reset rod, with one end connected to the reset rod and the other end connected to the sealing cover.

2. The safety controller for mining belt conveyors according to claim 1, characterized in that: The controller housing has a switch actuation block travel groove in the middle of its inner bottom surface. The lower part of the switch actuation block is located in the switch actuation block travel groove. A pull rod travel groove is provided on each side of the switch actuation block travel groove. A travel limit hole is opened on the pull rod. The travel limit rod is installed in the travel limit hole and the lower part of the travel limit rod is located in the pull rod travel groove.

3. The safety controller for mining belt conveyors according to claim 2, characterized in that: The lower two sides of the switch actuating block have recessed openings that match the protrusions on both sides of the travel groove of the switch actuating block.

4. The safety controller for mining belt conveyors according to claim 2, characterized in that: Each of the pull rod and the switch actuation block is provided with a socket, wherein the socket on the pull rod partially coincides with the travel limit hole on the pull rod, and one end of the pull rod spring is inserted into the socket and sleeved on the travel limit rod; a fixing pin hole is provided on the switch actuation block, the socket on the switch actuation block partially coincides with the fixing pin hole on the switch actuation block, the other end of the pull rod spring is inserted into the socket on the switch actuation block, the pin is inserted into the fixing pin hole, and the pull rod spring is sleeved on the pin.

Images