A broken roller alarm device for monitoring the rotating state of a roller bed furnace roller rod

Abstract

The utility model relates to alarm device technical field, and disclose a kind of for roll furnace roll stick rotation state monitoring's broken stick alarm device, comprising: transmission mechanism, set in transmission bin, for the rotation movement of roll stick passive end is led to transmission bin outside;Baffle, set in transmission bin outside, and the output end of transmission mechanism is connected, with roll stick synchronous rotation.The utility model leads to transmission bin outside by transmission mechanism the rotation movement of roll stick passive end, baffle with roll stick synchronous rotation, two groups of fiber-optic sensor form detection light path outside bin, baffle alternately shields light path when rotating and generates periodic pulse signal, if roll stick breaks, baffle stops and causes pulse signal to disappear, fiber-optic detection mechanism immediately outputs alarm, this design makes detection element away from high temperature in furnace, flue gas and dust, fiber-optic sensor anti-interference ability is strong, ensure broken stick after triggering alarm, avoid saggar overturn and interlock production stop.

Description

Technical Field

[0001] This utility model relates to the field of alarm device technology, specifically a broken bar alarm device for monitoring the rotation status of roller bars in a roller furnace. Background Technology

[0002] Roller furnaces are core heat treatment equipment in industries such as ceramics and lithium battery positive and negative electrode materials. They transport products by continuously rotating numerous parallel rollers. These rollers operate under harsh conditions of high temperature and high load for extended periods, posing a risk of breakage. If a roller breaks, the sagger it supports will overturn, not only scrapping the products but also potentially triggering a chain reaction, such as jamming adjacent rollers, causing large-scale production stoppages, and resulting in huge economic losses.

[0003] In existing technologies, most solutions for monitoring broken bars use optical detection methods (such as laser blocking). However, the operation of roller furnaces generates a large amount of high-temperature flue gas and dust, which seriously interferes with the transmission of optical signals. Furthermore, the optical equipment itself is prone to failure in high-temperature environments, resulting in insufficient reliability.

[0004] In order to solve the problems existing in the prior art, this application proposes a broken bar alarm device for monitoring the rotation status of roller bars in a roller furnace. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model proposes a broken bar alarm device for monitoring the rotation status of roller bars in a roller furnace.

[0006] This utility model proposes a broken rod alarm device for monitoring the rotational state of rollers in a roller conveyor furnace, comprising: a transmission mechanism disposed inside a transmission chamber for guiding the rotational motion of the passive end of the roller to the outside of the transmission chamber; a baffle disposed outside the transmission chamber and connected to the output end of the transmission mechanism, rotating synchronously with the roller; and an optical fiber detection mechanism fixed outside the transmission chamber, having two sets of optical fiber sensors, each set of optical fiber sensors including a signal transmitting end and a signal receiving end arranged opposite to each other to form two detection optical paths; the two detection optical paths are respectively disposed on both sides of the baffle, and the baffle alternately blocks the two detection optical paths during the rotation cycle to generate periodic pulse signals. When any roller breaks, causing the baffle to stop rotating, the pulse signal disappears, and the optical fiber detection mechanism outputs a broken rod alarm signal. To address the problem of interference from high temperatures, flue gas, and dust inside the furnace in traditional optical detection, this device achieves a breakthrough through "internal transmission + external detection". The transmission mechanism rotates the passive end of the roller to lead it out of the chamber, avoiding contact between the detection element and the harsh environment. The baffle rotates synchronously with the roller, and the two sets of fiber optic sensors form an independent optical path outside the chamber. The baffle alternately blocks the light to generate periodic pulse signals. If the roller breaks, the baffle stops rotating, causing the pulse signal to disappear. The fiber optic detection mechanism outputs an alarm, which can prevent the sagger from tipping over. It is suitable for high-temperature heat treatment scenarios such as ceramics and positive and negative electrode materials of lithium batteries. The alarm accuracy is high, with no missed or false alarms.

[0007] As a further optimized solution of this utility model, the transmission mechanism includes a fixed frame, a horizontal shaft, a vertical shaft, a rotating top shaft, and a bevel gear set; the fixed frame is fixedly installed inside the transmission chamber; the horizontal shaft and the vertical shaft are perpendicular to each other and are both rotatably connected to the fixed frame; one end of the horizontal shaft is connected to the driven end of the roller, and one end of the vertical shaft is connected to the baffle through the rotating top shaft; the bevel gear set includes two meshing bevel gears, which are respectively fixed to adjacent ends of the horizontal shaft and the vertical shaft extending into the fixed frame; The fixed frame provides stable support for the transmission components. The horizontal bearing receives the rotational power of the rollers, and the vertical shaft achieves 90-degree power steering through the bevel gear set. The rotating top shaft connects the vertical shaft and the baffle to ensure stable power transmission. This transmission structure is suitable for the narrow space of the roller furnace transmission chamber, avoids the problem of easy jamming of chain and belt transmission methods, can work for a long time, and extends the maintenance cycle.

[0008] As a further optimization of this utility model, the horizontal axis, vertical axis and rotating top axis are all supported on the fixed frame by self-aligning bearings to automatically compensate for the bending or concentricity deviation of the rollers. Self-aligning bearings allow for an angular deviation of ±2° in the shaft system, automatically compensating for bending or concentricity deviations of the rollers caused by high-temperature loads. This avoids shaft jamming caused by traditional fixed bearings. Self-aligning bearings also reduce transmission noise, decrease wear between the shaft and bearings, ensure stable rotational angular velocity of the baffle, control pulse signal period error, and improve the accuracy of broken bar identification.

[0009] As a further optimization of this utility model, springs are fitted on both the horizontal and vertical shafts. The two bevel gears are connected to the horizontal and vertical shafts respectively by a flat key. The two ends of the springs are connected to the end faces of the adjacent bevel gears and the inner wall of the fixing frame respectively. Under the preload of the springs, the two bevel gears always maintain a backlash-free meshing, eliminating the risk of disengagement caused by machining or installation errors. The spring provides preload through its elasticity, ensuring that the bevel gears are always engaged without backlash, avoiding the "half-tooth engagement" caused by machining errors or installation deviations in traditional gears. It also prevents asynchronous rotation of the baffles caused by transmission clearance. The flat key ensures that the bevel gears are fixed to the shaft circumferentially without slippage. Combined with the spring preload, it can reduce the bevel gear disengagement rate and is suitable for long-term high-frequency operation of roller furnaces.

[0010] As a further optimization of this utility model, snap rings are provided at the adjacent ends of both the horizontal and vertical shafts to limit the bevel gears at the shaft ends. The snap ring is installed in the slot at the shaft end to limit the axial displacement of the bevel gear, prevent the gear from axial movement caused by the spring preload, and ensure stable meshing depth. The snap ring has a simple structure and is easy to install and remove. Compared with the traditional nut limit, it saves a lot of maintenance time and prevents the gear from loosening due to vibration, thus improving the reliability of transmission.

[0011] As a further optimization of this utility model, the baffle is L-shaped, and the two sides of the L-shape cover two detection optical paths, ensuring that at least one optical path is blocked at any rotation angle, thus achieving blind-spot-free monitoring. The two sides of the L-shaped baffle correspond to two detection optical paths, which are alternately blocked during rotation. At any stopping angle, at least one optical path is blocked, eliminating detection blind spots. Traditional circular baffles are prone to causing the optical path to be fully open due to the stopping angle, resulting in missed detections. The L-shaped design avoids this problem and ensures immediate identification after the rod breaks.

[0012] As a further optimization of this utility model, the output end of the fiber optic detection mechanism is connected to a PLC or host computer and uploads the production line shutdown signal. The output alarm signal is uploaded to the PLC or host computer via RS communication to trigger an emergency shutdown of the production line. At the same time, the location of the broken rod is displayed on the monitoring interface, which facilitates workers to quickly locate and repair it. Compared with traditional manual inspection, this design can reduce product scrap and equipment damage losses.

[0013] As a further optimization of this utility model, a floating connection structure is provided between the horizontal shaft and the passive end of the roller to avoid additional stress on the transmission mechanism caused by the axial thermal expansion and sliding of the roller. When the roller furnace is working, the rollers will expand axially due to high temperature. The floating connection structure can absorb the expansion and avoid additional stress on the horizontal shaft and bevel gear set. This structure can reduce the damage rate of the transmission mechanism, thereby increasing the service life and significantly reducing the operation and maintenance costs.

[0014] As a further optimized solution of this utility model, the floating connection structure includes a connecting shaft, an axially arranged movable hole is opened at the end of the passive end of the roller, a connecting shaft perpendicular to its axis is installed in the movable hole, a sliding groove is opened at the end of the horizontal shaft away from the bevel gear set along its axis, the free end of the horizontal shaft is inserted into the movable hole, and the sliding groove is slidably assembled with the connecting shaft to absorb the thermal expansion and elongation of the roller. The connecting shaft is installed horizontally in the movable hole of the roller. The groove of the horizontal shaft slides in conjunction with the connecting shaft. When the roller expands thermally, the connecting shaft slides axially along the groove without jamming or getting stuck. This structure requires no additional lubrication, is suitable for dusty environments in the transmission chamber, and ensures that the rotational power of the roller is efficiently transmitted to the horizontal shaft.

[0015] As a further optimization of this utility model, the slide is U-shaped, and the inner diameter of the opening is adapted to the outer diameter of the connecting shaft, which facilitates the quick assembly of the horizontal shaft and the connecting shaft. At the same time, it ensures that there is no radial offset during sliding, avoiding transmission jamming caused by offset. The U-shaped opening design also facilitates disassembly during later maintenance without disassembling the entire transmission mechanism, greatly improving maintenance efficiency and adapting to the rapid maintenance needs of multi-roller bars in roller furnaces.

[0016] The broken bar alarm device for monitoring the rotational state of roller bars in a roller furnace proposed in this utility model has the following beneficial effects: (i) A breakthrough is achieved through the design of "transmission mechanism + external baffle + fiber optic detection". The transmission mechanism leads the rotational motion of the passive end of the roller to the outside of the transmission chamber. The baffle rotates synchronously with the roller. Two sets of fiber optic sensors form a detection optical path outside the chamber. When the baffle rotates, it alternately blocks the optical path to generate periodic pulse signals. If the roller breaks, the baffle stops rotating, causing the pulse signal to disappear. The fiber optic detection mechanism immediately outputs an alarm. This design keeps the detection element away from the high temperature, flue gas and dust in the furnace. The fiber optic sensor has strong anti-interference ability, ensuring that the alarm is triggered after the roller breaks, avoiding the overturning of the sagger and the chain shutdown. (ii) By supporting the horizontal shaft, vertical shaft and rotating top shaft with self-aligning bearings, the bending and running deviation of the rollers caused by high temperature load can be automatically compensated. The transmission process is smooth and the rotational angular velocity of the baffle is small. Compared with traditional fixed bearings, self-aligning bearings can also reduce transmission noise and mechanical wear, thereby extending the maintenance cycle of the transmission mechanism. They are suitable for the long-term high-load operation of rollers in the production of ceramics and lithium battery materials. (III) The springs on the horizontal and vertical axes provide continuous preload to the bevel gear set, ensuring that the two bevel gears are always meshed without backlash. Even if there are machining errors or installation deviations, the pulse signal disorder caused by transmission backlash can be avoided. Traditional gear transmission is prone to "half-tooth meshing" due to backlash, which leads to asynchronous rotation of the baffle and a high false alarm rate. This design greatly improves the gear meshing accuracy, helps to reduce the pulse signal period error, improves the accuracy of broken bar identification, and thus eliminates false alarms or missed alarms caused by transmission problems. (iv) The floating connection structure of “connecting shaft + U-shaped slide groove” allows the roller to slide freely along the axial direction when it expands thermally, avoiding additional stress on the horizontal shaft and bevel gear set. This structure can reduce the damage rate of the transmission mechanism caused by thermal expansion, further extend the service life of the device, and reduce the operation and maintenance costs. (v) The two sides of the L-shaped baffle cover two detection optical paths. During rotation, at any angle, at least one optical path can be blocked, ensuring that the pulse signal is continuous and uninterrupted, with no blind spot monitoring. Even if the baffle stops rotating at any angle after the roller breaks, the fiber optic detection mechanism can quickly identify the disappearance of the pulse signal. The alarm response time is short, which saves time for emergency shutdown of the production line and reduces product scrap and equipment damage losses.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a front view structural diagram of the present utility model; Figure 2 This utility model Figure 1 Schematic diagram of the transmission mechanism; Figure 3 This is a top view of the structure of this utility model.

[0019] 1. Transmission mechanism; 2. Rotary top shaft; 3. Self-aligning bearing; 4. Baffle plate; 5. Connecting shaft; 6. Roller; 7. Fiber optic detection mechanism; 8. Transmission chamber; 11. Fixing bracket; 12. Horizontal shaft; 13. Bevel gear set; 14. Spring; 15. Vertical shaft; 16. Snap ring; 17. Flat key. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] Example 1 Please see Figures 1-3 A broken bar alarm device for monitoring the rotation status of roller bars in a roller furnace includes a transmission mechanism 1 installed in a transmission chamber 8 and a baffle 4 at the upper end of the transmission mechanism 1 in the transmission chamber 8. The passive end of the roller bar 6 extends horizontally from the furnace to the transmission chamber 8 and drives the baffle 4 to rotate through the transmission mechanism 1. An optical fiber detection mechanism 7 for detecting the rotation status of the baffle 4 is also installed at the upper end of the transmission chamber 8. The fiber optic detection mechanism 7 has two sets of fiber optic sensors. Each set of fiber optic sensors includes a signal transmitter and a signal receiver. The signal transmitter and signal receiver are arranged opposite each other to form a detection optical path. The two detection optical paths are respectively set on both sides of the baffle 4. The rotation of the baffle 4 will periodically block the detection optical path, thereby generating a periodic signal. When a roller 6 breaks at a certain point, the corresponding baffle 4 will stop rotating. At this time, the corresponding set of fiber optic sensors in the fiber optic detection mechanism 7 will be continuously blocked, and the periodic signal will be disordered, thereby identifying the broken rod and issuing an alarm signal.

[0023] Example 2 Based on Embodiment 1, the transmission mechanism 1 includes a fixed frame 11 installed in the transmission chamber 8. The fixed frame 11 is U-shaped, and a horizontal shaft 12 and a vertical shaft 15 are rotatably mounted on the side and upper part of the fixed frame 11, respectively. The horizontal shaft 12 and the vertical shaft 15 are perpendicular to each other and their adjacent ends are connected by a bevel gear set 13. The end of the horizontal shaft 12 away from the bevel gear set 13 extends horizontally and is connected to the passive end of the roller 6, so that the roller 6 can drive the horizontal shaft 12 to rotate. The horizontal shaft 12 drives the vertical shaft 15 to rotate through the bevel gear set 13. The end of the vertical shaft 15 away from the bevel gear set 13 extends upward and is connected to the baffle 4 through a rotating top shaft 2 rotatably mounted on the upper end of the transmission chamber 8, thereby driving the baffle 4 to rotate. When the roller 6 rotates, it drives the horizontal shaft 12 to rotate, and then drives the vertical shaft 15 to rotate through the bevel gear set 13, which in turn drives the rotating top shaft 2 to drive the baffle 4 to rotate synchronously. In other words, the transmission mechanism 1 converts the rotational motion of the roller 6 inside the sealed chamber into the rotational motion of the baffle 4 outside the chamber, which facilitates the fiber optic detection mechanism 7 to perform detection outside the transmission chamber 8. Furthermore, mounting holes are provided on the side and top of the fixed frame 11 and the top of the transmission chamber 8, and a self-aligning bearing 3 is embedded in each mounting hole and fixed with bolts. The horizontal shaft 12, the vertical shaft 15, and the rotating top shaft 2 pass through the corresponding self-aligning bearing 3 and are fixed with their inner rings. Since the roller 6 is usually installed horizontally and fixed by supports on both sides, it will have a slight jumping phenomenon during rotation. Also, each roller 6 is usually two or three meters long and carries a heavy load in the middle, so the whole will be bent to a certain extent and the rotation center will change. When the end of the roller 6 jumps slightly or bends and produces an angle, the horizontal shaft 12 will tilt accordingly through the self-aligning bearing 3 to ensure smooth transmission. Furthermore, the upper end of the vertical shaft 15 is provided with a slot, the lower end of the rotating top shaft 2 extends into the transmission chamber 8 and has a locking block, the locking block is inserted into the slot and fixed by a pin, and the upper end of the rotating top shaft 2 extends above the transmission chamber 8 and is fixed to the baffle 4 by screws.

[0024] Example 3 Based on Example 2, such as Figure 2 As shown, the bevel gear set 13 includes two bevel gears, which are respectively mounted on the shaft ends of the horizontal shaft 12 and the vertical shaft 15 that are close to each other. The bevel gears are connected to the corresponding shaft ends by a flat key 17. One end face of the bevel gear is connected to the inner wall of the fixing frame 11 by a spring 14, and the other end face of the bevel gear is limited by a snap ring 16 that is snapped onto the shaft end. Under the elastic force of the spring 14, the two bevel gears can always maintain a meshing state, thereby ensuring smooth transmission.

[0025] Example 4 In the existing technology, mechanical means such as chains are proposed to lead out the rotation for detection, but the thermal expansion phenomenon of the roller under high temperature operation is not fully considered. Thermal expansion and contraction will cause the transmission mechanism to be stiff, worn or even damaged, and cannot work stably for a long time. Therefore, based on Example 2, as Figure 1 and Figure 2 As shown, the passive end of the roller 6 extends into the transmission chamber 8 and has an axially arranged movable hole at its end. The connecting shaft 5 is installed through the movable hole, and the axis of the connecting shaft 5 is perpendicular to the axis of the roller 6. The horizontal shaft 12 has a sliding groove arranged along its axis at the end away from the bevel gear set 13. The sliding groove is U-shaped and the inner diameter of the opening is adapted to the outer diameter of the connecting shaft 5. The free end of the horizontal shaft 12 is inserted into the movable hole, and the U-shaped sliding groove is slidably assembled with the connecting shaft 5 to absorb the thermal expansion and elongation of the roller. When the roller furnace is working, it is in a high-temperature state. The roller bar 6 is usually made of silicon carbide. Under high temperature, it will expand and elongate. At this time, the installation position of the passive end of the roller bar 6 in the cold state will be different from that in the high-temperature state. When the roller bar 6 elongates, the connecting shaft 5 will slide in the end groove of the horizontal shaft 12 to avoid affecting the movement state of the transmission mechanism 1.

[0026] Example 5 Based on any of the above embodiments, such as Figure 3 As shown, the baffle 4 is L-shaped, so that during the rotation of the baffle 4, there is always one side blocking the light path, thereby avoiding the occurrence of detection blind spots.

[0027] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A broken bar alarm device for monitoring the rotational state of roller bars in a roller conveyor furnace, characterized in that, include: The transmission mechanism (1) is located inside the transmission chamber (8) and is used to guide the rotational motion of the passive end of the roller (6) to the outside of the transmission chamber (8); The baffle (4) is located outside the transmission chamber (8) and connected to the output end of the transmission mechanism (1), and rotates synchronously with the roller (6); The fiber optic detection mechanism (7) is fixed outside the transmission chamber (8) and has two sets of fiber optic sensors. Each set of fiber optic sensors includes a signal transmitting end and a signal receiving end arranged opposite to each other to form two detection optical paths. Two detection optical paths are respectively set on both sides of the baffle (4). The baffle (4) alternately blocks the two detection optical paths during the rotation cycle, generating periodic pulse signals. When any roller (6) breaks, causing the baffle (4) to stop rotating, the pulse signal disappears, and the fiber optic detection mechanism (7) outputs a broken rod alarm signal.

2. The broken bar alarm device for monitoring the rotational state of roller bars in a roller conveyor furnace according to claim 1, characterized in that, The transmission mechanism (1) includes a fixed frame (11), a horizontal shaft (12), a vertical shaft (15), a rotating top shaft (2), and a bevel gear set (13). The mounting bracket (11) is fixedly installed inside the transmission compartment (8); The horizontal axis (12) and the vertical axis (15) are perpendicular to each other and are both rotatably connected to the fixed frame (11); One end of the horizontal shaft (12) is connected to the passive end of the roller (6), and one end of the vertical shaft (15) is connected to the baffle (4) through the rotating top shaft (2); The bevel gear set (13) comprises two meshing bevel gears, which are fixed to adjacent ends of a horizontal shaft (12) and a vertical shaft (15) extending into a mounting bracket (11).

3. A broken bar alarm device for monitoring the rotational state of roller bars in a roller conveyor furnace according to claim 2, characterized in that, The horizontal shaft (12), vertical shaft (15) and rotating top shaft (2) are all supported on the fixed frame (11) by self-aligning bearings (3) to automatically compensate for the bending or concentricity deviation of the roller (6).

4. A broken bar alarm device for monitoring the rotational state of roller bars in a roller conveyor furnace according to claim 2, characterized in that, Springs (14) are fitted on both the horizontal shaft (12) and the vertical shaft (15). The two bevel gears are connected to the horizontal shaft (12) and the vertical shaft (15) respectively by a flat key (17). The two ends of the spring (14) are connected to the end face of the adjacent bevel gear and the inner wall of the fixing frame (11) respectively. Under the preload of the spring (14), the two bevel gears always maintain a backlash-free meshing.

5. A broken bar alarm device for monitoring the rotational state of roller bars in a roller conveyor furnace according to claim 4, characterized in that, Both the horizontal shaft (12) and the vertical shaft (15) are provided with snap rings (16) at adjacent ends to limit the bevel gears at the shaft ends.

6. A broken bar alarm device for monitoring the rotational state of roller bars in a roller conveyor furnace according to claim 1, characterized in that, The baffle (4) is L-shaped, and the two sides of the L-shape cover the two detection optical paths, ensuring that at least one optical path is blocked when rotating at any angle.

7. A broken bar alarm device for monitoring the rotational state of roller bars in a roller conveyor furnace according to claim 1, characterized in that, The output end of the fiber optic testing mechanism (7) is connected to a PLC or host computer and uploads the production line shutdown signal.

8. A broken bar alarm device for monitoring the rotational state of roller bars in a roller conveyor furnace according to claim 2, characterized in that, A floating connection structure is provided between the horizontal shaft (12) and the passive end of the roller (6) to avoid the additional stress on the transmission mechanism (1) caused by the axial thermal expansion sliding of the roller (6).

9. A broken bar alarm device for monitoring the rotational state of roller bars in a roller conveyor furnace according to claim 8, characterized in that, The floating connection structure includes a connecting shaft (5), and an axially arranged movable hole is provided at the passive end of the roller (6). The connecting shaft (5) perpendicular to its axis is installed in the movable hole. A sliding groove is provided at the end of the horizontal shaft (12) away from the bevel gear set (13) along its axis. The free end of the horizontal shaft (12) is inserted into the movable hole and the sliding groove is slidably assembled with the connecting shaft (5) to absorb the thermal expansion and elongation of the roller.

10. A broken bar alarm device for monitoring the rotational state of roller bars in a roller conveyor furnace according to claim 9, characterized in that, The groove is U-shaped, and the inner diameter of the opening is matched with the outer diameter of the connecting shaft (5).

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