Chain breakage detection device for a flight bar machine and flight bar machine

Abstract

This application relates to the field of scraper conveyor technology, and proposes a scraper conveyor chain breakage detection device and a scraper conveyor, comprising: a housing, the interior of which is divided into a collection chamber and a transmission chamber by a limiting plate, the limiting plate having a limiting hole; a signal collection mechanism, including a proximity switch and a sensing element disposed in the collection chamber, and a receiving rod; the receiving rod slidably passes through the limiting hole, one end of the receiving rod being connected to the sensing element; a transmission mechanism, including a roller, a support shaft, and a cam disposed in the transmission chamber; the roller being connected to the other end of the receiving rod, the cam being rotatably mounted on the support shaft and abutting against the roller; a lever mechanism, fixedly connected to the cam and capable of rotating with the cam around the support shaft, used to generate periodic oscillations when propelled by the scraper; and a control device, electrically connected to the proximity switch. The proximity switch can detect the oscillation interval period, thereby monitoring the operating status of the scraper conveyor, and promptly controlling the scraper conveyor to stop when a fault such as chain breakage is detected.

Description

Technical Field

[0001] This application relates to the field of scraper conveyor technology, and more specifically, to a scraper conveyor chain breakage detection device and a scraper conveyor. Background Technology

[0002] In the coal mining and transportation sector, scraper conveyors are a crucial component of material handling systems. Their transmission mechanism typically employs a drive sprocket that powers two sets of parallel, closed-loop traction chains. Equidistant pusher plates, mounted between the chains, move in a directional, cyclical motion along guide channels under the drive of the sprocket, achieving continuous conveying of bulk materials. During actual operation, due to differences in conveying distance and changes in path, the dual-chain drive system often experiences uneven dynamic load distribution, easily leading to abnormal chain bounce or breakage of traction components. Considering the equipment's fully enclosed protective cover design, when a chain breaks, operators may find it difficult to detect the fault promptly through conventional observation methods. Failure to implement rapid shutdown and repair can cause a chain reaction, such as transmission mechanism jamming and scraper assembly deformation, ultimately leading to a major mechanical accident resulting in the overall failure of the equipment. Utility Model Content

[0003] In order to solve the technical problem that the failure of the scraper conveyor chain to be detected in time may cause a chain reaction such as jamming of the transmission mechanism and deformation of the scraper assembly, the first aspect of this application proposes a scraper conveyor chain breakage detection device.

[0004] A second aspect of this application also proposes a scraper conveyor.

[0005] In view of this, the first aspect of this application proposes a scraper conveyor chain breakage detection device, comprising: a housing, the interior of which is divided into a collection chamber and a transmission chamber by a limiting plate, the limiting plate having a limiting hole; a signal collection mechanism, including a proximity switch and a sensing element disposed in the collection chamber, and a receiving rod; the receiving rod slidably passes through the limiting hole, one end of the receiving rod being connected to the sensing element; a transmission mechanism, including a roller, a support shaft, and a cam disposed in the transmission chamber; the roller being connected to the other end of the receiving rod, the cam being rotatably mounted on the support shaft and abutting against the roller; a lever mechanism, fixedly connected to the cam and capable of rotating with the cam around the support shaft, used to generate periodic oscillations when a scraper is actuated; and a control device, electrically connected to the proximity switch.

[0006] In conjunction with the first aspect, in some feasible embodiments, the proximity switch includes: a first proximity switch and a second proximity switch, the first proximity switch and the second proximity switch being opposite to and spaced apart, and a sensing element being located between the first proximity switch and the second proximity switch.

[0007] In conjunction with the first aspect, in some feasible ways, both the first proximity switch and the second proximity switch are photoelectric proximity switches, which are mounted on the inner wall of the acquisition cavity by adjustable fixing bolts.

[0008] In conjunction with the first aspect, in some feasible embodiments, the lever mechanism includes: a connecting lever, one end of which is fixedly connected to a cam; and a receiving lever, the other end of which is detachably connected to the receiving lever.

[0009] In conjunction with the first aspect, in some feasible ways, the strike lever has a multi-chamber rubber damping layer inside, a polyurethane coating layer on the outside, and a wavy wear-resistant texture on the bottom contact surface.

[0010] In conjunction with the first aspect, in some feasible embodiments, the scraper conveyor chain breakage detection device further includes: a fixing device, located at the bottom of the housing, the fixing device having a first guide groove, and a lever mechanism that can swing through the first guide groove.

[0011] In conjunction with the first aspect, in some feasible ways, the working surface of the cam is an asymmetric curved surface, and the lift curve of the cam is linearly related to the running speed of the scraper.

[0012] In conjunction with the first aspect, in some feasible ways, the roller surface is coated with a polyurethane wear-resistant layer, and a solid dry film lubricating coating is attached to the contact surface between the roller and the cam.

[0013] The second aspect of this application discloses a scraper conveyor, comprising: a scraper conveyor chain breakage detection device as described in any of the above technical solutions.

[0014] In conjunction with the second aspect, in some feasible embodiments, the scraper conveyor further includes: a machine body; a conveying trough disposed on the machine body; a cover plate disposed on the top of the machine body, the cover plate having a second guide groove corresponding to the first guide groove; a drive unit disposed at one end of the machine body; a first chain and a second chain disposed opposite to each other on both sides of the conveying trough and driven by the drive unit; and multiple scrapers disposed at intervals between the first chain and the second chain; wherein, a scraper conveyor chain breakage detection device is disposed on the cover plate, and a lever mechanism extends through the second guide groove on the cover plate into the conveying trough and interferes with the movement trajectory of the scraper, so that the scraper can periodically actuate the lever mechanism during operation.

[0015] Compared with related technologies, this application has the following technical advantages:

[0016] The scraper conveyor chain breakage detection device provided in this application converts the linear motion of the scraper into the reciprocating oscillation of the lever and the shaft, and further converts it into the reciprocating linear motion of the sensing plate via a cam. This allows a proximity switch to detect the oscillation interval period, thereby monitoring the operating status of the scraper conveyor. When a fault such as chain breakage occurs, the device can promptly monitor changes in the operating status of the sensing plate, thereby controlling the scraper conveyor to stop and preventing the accident from escalating further.

[0017] By placing the proximity switch and sensing element inside a closed acquisition chamber, dust and moisture can be effectively isolated, protecting electronic components such as the proximity switch. This allows it to adapt to harsh environments such as underground coal mines, while also preventing false triggering and shutdown caused by other factors, resulting in more stable and reliable overall operation.

[0018] The lever mechanism includes a connecting lever and a striking lever, which are detachably connected, significantly reducing maintenance time. The special polyurethane-coated composite buffer structure can greatly extend the life of the components.

[0019] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 A schematic diagram of the structure of a scraper conveyor chain breakage detection device according to one embodiment of this application is shown;

[0022] Figure 2 A partial structural schematic diagram of a scraper conveyor chain breakage detection device according to one embodiment of this application is shown;

[0023] Figure 3 This invention provides a schematic diagram illustrating the connection state between the signal acquisition mechanism and the transmission mechanism in one embodiment of the present application.

[0024] Figure 4 A schematic diagram of the scraper conveyor in one embodiment of this application is shown;

[0025] Figure 5 A partial structural schematic diagram of a scraper conveyor according to one embodiment of this application is shown.

[0026] in, Figures 1 to 5 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0027] 1. Signal acquisition mechanism, 101. Fixing bolt, 102. Proximity switch, 103. Sensing plate, 104. Receiving rod, 105. Limiting plate, 106. Protective housing, 2. Transmission mechanism, 201. Roller, 202. Support shaft, 203. Cam, 204. Fixing device, 3. Lever mechanism, 301. Connecting lever, 302. Receiver lever, 4. Cover plate, 5. Scraper, 6. First chain, 7. Second chain. Detailed Implementation

[0028] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0030] The following reference Figures 1 to 5 This application describes a scraper conveyor chain breakage detection device and a scraper conveyor according to some embodiments.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the first aspect of this application proposes a scraper conveyor chain breakage detection device, comprising: a housing, the interior of which is divided into a collection chamber and a transmission chamber by a limiting plate 105, the limiting plate 105 having a limiting hole; a signal collection mechanism 1, including a proximity switch 102 and a sensing plate 103 disposed in the collection chamber, and a receiving rod 104; the receiving rod 104 slidably passes through the limiting hole, one end of the receiving rod 104 being connected to the sensing plate 103; a transmission mechanism 2, including a roller 201, a support shaft 202, and a cam 203 disposed in the transmission chamber; the roller 201 being connected to the other end of the receiving rod 104, the cam 203 being rotatably fitted onto the support shaft 202 and abutting against the roller 201; a lever mechanism 3, fixedly connected to the cam 203 and capable of rotating around the support shaft 202 with the cam 203, used to generate periodic oscillations when a scraper 5 is actuated; and a control device, electrically connected to the proximity switch 102.

[0032] The scraper conveyor chain breakage detection device provided in this application includes a housing, a signal acquisition mechanism 1, a transmission mechanism 2, a lever mechanism 3, and a control device. The housing is divided into an acquisition chamber and a transmission chamber by a limiting plate 105. Precision sensing components such as the proximity switch 102 and the sensing element 103 are placed inside the acquisition chamber, effectively isolating them from interference from harsh working conditions such as dust and coal dust. Simultaneously, the transmission mechanism 2 is located inside the transmission chamber, reducing the wear of external contaminants on the cam 203-roller 201 pair and ensuring long-term stable operation.

[0033] The linear motion of the scraper 5 is converted into the rotational motion of the cam 203 by the lever mechanism 3, which is then converted into the linear reciprocating motion of the receiving rod 104 and the sensing plate 103 by the cam 203-roller 201 structure. When the chain is working normally, the scraper 5 periodically actuates the lever mechanism 3, driving the cam 203-roller 201-receiving rod 104 mechanism to move, causing the sensing plate 103 to produce regular displacement. Once the chain breaks, the displacement signal of the sensing plate 103 becomes abnormal, and the proximity switch 102 immediately detects the change in state and feeds it back to the control device, realizing real-time monitoring and rapid response to chain breakage.

[0034] Specifically, the cam 203 abuts against the roller 201, converting the rotational motion of the cam 203 into the linear motion of the receiving rod 104. The guiding effect of the limiting hole ensures accurate motion trajectory and avoids false alarms caused by mechanical gaps or vibrations in traditional detection devices. At the same time, the non-contact proximity switch 102 replaces the traditional mechanical contacts, reducing wear and extending service life.

[0035] The scraper conveyor chain breakage detection device provided in this application converts the linear motion of the scraper 5 into the reciprocating oscillation of the lever and the shaft, and further converts it into the reciprocating linear motion of the sensing plate 103 via the cam 203. This allows the proximity switch 102 to detect the oscillation interval period, thereby monitoring the operating status of the scraper conveyor. When a fault such as chain breakage occurs, the change in the operating status of the sensing plate 103 can be monitored in a timely manner, thereby controlling the scraper conveyor to stop and preventing the accident from escalating further.

[0036] like Figure 2 As shown, in some embodiments provided in this application, the proximity switch 102 includes: a first proximity switch and a second proximity switch, the first proximity switch and the second proximity switch being opposite to each other and spaced apart, and the sensing sheet 103 being located between the first proximity switch and the second proximity switch.

[0037] In this embodiment, the first proximity switch and the second proximity switch are arranged at a relative interval, with the sensing element 103 located between them. The periodic displacement of the sensing element 103 triggers alternating changes in the switch signal. When the chain breaks, the signal synchronization becomes abnormal, improving detection accuracy and reducing the false alarm rate. The dual-switch configuration of the first and second proximity switches allows for cross-verification of the signals, enhancing anti-interference capabilities.

[0038] like Figure 2 As shown, in some embodiments provided in this application, both the first proximity switch and the second proximity switch are photoelectric proximity switches, which are mounted on the inner wall of the acquisition cavity by adjustable fixing bolts 101.

[0039] In this embodiment, a dual photoelectric proximity switch differential detection design is adopted. The installation position can be precisely adjusted using adjustable bolts, improving the sensitivity of the sensor 103 in capturing displacement signals. The non-contact nature of the photoelectric switches reduces mechanical wear, and the two switches are positioned relatively apart to cross-verify signal changes, effectively reducing the false alarm rate caused by dust interference.

[0040] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments provided in this application, the lever mechanism 3 includes: a connecting lever 301, one end of which is fixedly connected to the cam 203; and a receiving lever 302, which is detachably connected to the other end of the receiving lever and the connecting lever 301.

[0041] In this embodiment, the lever mechanism 3 includes a connecting lever 301 and an impact-bearing lever 302. The impact-bearing lever 302, as a component directly bearing mechanical impact and wear, can be manufactured solely from wear-resistant materials. If damaged, the entire mechanism does not need to be replaced; only the damaged section needs to be unscrewed and replaced, reducing maintenance costs and downtime. Simultaneously, it protects the connecting lever 301, cam 203, and precision sensing mechanism behind it from direct impact, ensuring the long-term stability and reliability of the core transmission and detection units. This significantly improves the economy and maintainability of the device under harsh operating conditions.

[0042] In some embodiments provided in this application, the strike lever 302 has a multi-chamber rubber damping layer inside, a polyurethane coating layer on the outside, and a wavy wear-resistant texture on the bottom contact surface.

[0043] In this embodiment, the impact lever 302 is in direct contact with the scraper 5. The polyurethane coating provides excellent wear resistance and corrosion resistance, directly resisting the severe friction and media erosion of the scraper 5. The internal multi-chamber rubber damping layer efficiently absorbs and buffers the instantaneous impact force of the scraper 5 through the compression deformation of multiple air chambers, significantly reducing the stress transmitted to the rear mechanism and protecting the cam 203 and sensor from damage. The wavy wear-resistant texture at the bottom increases surface hardness and frictional resistance, ensuring that the lever mechanism 3 can be reliably actuated. Its wavy structure can also scrape away accumulated coal, providing a certain degree of self-cleaning effect.

[0044] By combining a multi-chamber rubber damping layer, a polyurethane coating layer, and a corrugated wear-resistant texture, the device not only greatly extends its own replacement cycle but also provides crucial overload protection for the entire detection system, ensuring the stability of signal acquisition and the overall reliability of the device.

[0045] like Figure 2 As shown, in some embodiments provided in this application, the scraper conveyor chain breakage detection device further includes: a fixing device 204, which is set at the bottom of the housing, and a first guide groove is provided on the fixing device 204, and the lever mechanism 3 is swayably inserted through the first guide groove.

[0046] In this embodiment, the scraper conveyor chain breakage detection device also includes a fixing device 204. The first guide groove provides a forced and fixed motion trajectory for the swing of the lever mechanism 3, ensuring that it can only swing within the preset first guide groove. This effectively prevents the lever from lateral movement, twisting, or even jamming caused by the impact angle deviation of the scraper 5 or chain vibration, ensuring the reliability and consistency of the swing action, thereby generating an accurate trigger signal.

[0047] In practical applications, the fixing device 204 serves as the base plate of the housing. Multiple through holes are provided on the fixing device 204, and the scraper chain breakage detection device can be fixed to the scraper machine by bolts passing through the through holes.

[0048] In some embodiments provided in this application, the working surface of the cam 203 is an asymmetrical curved surface, and the lift curve of the cam 203 is linearly related to the running speed of the scraper 5.

[0049] In this embodiment, the asymmetric curved surface of the cam 203 allows its rotational motion to precisely match the operating pattern of the scraper 5. The linear lift curve ensures a strict proportional relationship between the rotation angle of the cam 203 (i.e., the displacement of the scraper 5) and the lifting displacement of the receiving rod 104 (i.e., the moving speed of the sensing plate 103). This directly converts the linear speed change of the scraper 5 into a stable linear displacement change of the receiving rod 104, thus ensuring that the signal frequency and rate of change detected by the proximity switch 102 strictly correspond to the instantaneous speed of the scraper 5. This improves signal consistency and accuracy, effectively avoids misjudgments caused by speed fluctuations, provides more reliable speed and status information for the control device, and significantly enhances the accuracy of judging chain breakage and slippage faults.

[0050] In some embodiments provided in this application, the surface of the roller 201 is covered with a polyurethane wear-resistant layer, and a solid dry film lubricating coating is attached to the contact surface between the roller 201 and the cam 203.

[0051] In this embodiment, the polyurethane wear-resistant layer endows the roller 201 with excellent elasticity, impact resistance, and wear resistance, effectively buffering the contact stress caused by the rotation of the cam 203 and resisting wear caused by long-term cyclic loads. The solid dry film lubricating coating on the surface greatly reduces the coefficient of friction between the roller 201 and the working surface of the cam 203, reducing motion resistance and frictional heat at the source, avoiding problems such as jamming or accelerated wear caused by dried-up lubricating grease or coal dust adhesion, and ensuring that the roller 201-cam 203 transmission pair always operates sensitively and reliably.

[0052] The polyurethane wear-resistant layer and the solid dry film lubricating coating work together to form a self-lubricating, wear-resistant, and long-life combination under harsh working conditions, extending the maintenance cycle and ensuring the accuracy and consistency of speed and displacement signal conversion and transmission.

[0053] like Figure 4 and Figure 5 As shown, a second aspect of this application proposes a scraper conveyor, comprising: a scraper conveyor chain breakage detection device as described in any of the above embodiments.

[0054] The scraper conveyor provided in this application includes the scraper conveyor chain breakage detection device in any of the above embodiments, and thus has all the beneficial technical effects of the scraper conveyor chain breakage detection device, which will not be repeated here.

[0055] In practical applications, the scraper conveyor includes two scraper conveyor chain breakage detection devices. A single scraper 5 can simultaneously drive the lever mechanism 3 of the two scraper conveyor chain breakage detection devices to swing.

[0056] In some embodiments provided in this application, the scraper conveyor further includes: a machine body; a conveying trough disposed on the machine body; a cover plate 4 disposed on the top of the machine body, the cover plate 4 having a second guide groove corresponding to the first guide groove; a drive unit disposed at one end of the machine body; a first chain 6 and a second chain 7 disposed opposite to each other on both sides of the conveying trough and driven by the drive unit; and a plurality of scrapers 5 disposed at intervals between the first chain 6 and the second chain 7; wherein, a scraper conveyor chain breakage detection device is disposed on the cover plate 4, and a lever mechanism 3 extends through the second guide groove on the cover plate 4 into the conveying trough and interferes with the movement trajectory of the scraper 5, so that the scraper 5 can periodically actuate the lever mechanism 3 during operation.

[0057] The scraper conveyor provided in this application also includes a machine body, a conveying trough, a cover plate 4, a drive unit, a first chain 6, a second chain 7, and multiple scrapers 5. The detection device is directly mounted on the cover plate 4, and the lever mechanism 3 extends into the conveying trough through the second guide groove, directly interfering with the movement trajectory of the scrapers 5. This ensures that the lever mechanism 3 is reliably activated whenever a scraper 5 passes by, achieving the most direct and delay-free sensing of the chain and scraper 5 operation, and ensuring a reliable source of contact switch signals. By monitoring the periodicity of the lever mechanism 3 being activated, the proximity switch 102 can detect the oscillation interval period, thereby monitoring the operating status of the scraper conveyor. When a fault such as chain breakage occurs, the change in the operating status of the sensing element 103 can be detected in a timely manner, thereby controlling the scraper conveyor to stop and preventing further escalation of the accident.

[0058] In a specific embodiment, this application provides a scraper conveyor chain breakage detection device, including a signal acquisition mechanism 1, a transmission mechanism 2, a lever mechanism 3, and a control device. The signal acquisition mechanism 1 includes a fixing bolt 101, two sets of proximity switches 102, a sensing element 103, a receiving rod 104, a limiting plate 105, and a protective housing 106. The protective housing 106 is a box-like structure. The fixing bolt 101 fixes the proximity switches 102 inside the protective housing 106. The on / off signal and its frequency are transmitted to the PLC control device through the distance between the top of the proximity switch 102 and the sensing element 103. The protective housing 106 isolates the device from humid and dusty production environments, and both together protect the proximity switches 102 for normal operation and extend their service life.

[0059] The transmission mechanism 2 includes a roller 201, a support shaft 202, and a cam 203. The roller 201 is rotatably connected to the receiving rod 104 and can roll perpendicularly to the cam 203. The cam 203 is rotatably connected to the support shaft 202 and can swing freely around the support shaft 202. During the swinging process, the cam 203 drives the roller 201, which in turn causes the receiving rod 104 to move under the constraint of the limiting hole. This causes a change in the distance between the sensing element 103 and the proximity switch 102, transmitting on / off signals and frequencies. The protective housing 106 ensures the airtightness of the device. The transmission mechanism 2 reduces additional noise and potential material wear, ensuring stability and reliability. In complex operating environments, it improves practicality and reliability.

[0060] The lever mechanism 3 includes a connecting lever 301 and an impact lever 302, which are detachably connected to reduce weight, facilitate replacement, and lower the labor intensity of operators. The impact lever 302 is made of polyurethane and designed as a composite buffer structure. It features an internal multi-chamber rubber shock-absorbing layer and an external polyurethane coating. The bottom contact surface has a wavy, wear-resistant texture, making it more wear-resistant and impact-resistant during contact with the scraper 5, thus extending its service life. A second guide groove is provided on the cover plate 4 of the scraper conveyor. The connecting lever 301 passes through this second guide groove at the top of the cover plate 4 and connects to the impact lever 302. The bottom end of the impact lever 302 is in contact with the scraper 5. When the scraper conveyor is running, the scraper 5 moves forward and contacts the bottom of the impact lever 302, pushing it to swing. As the scraper 5 moves, the impact lever 302 also rises until it disengages from the scraper 5. Under the influence of gravity, lever 302 swings back to the plumb bob position. Then, the striking lever 302 contacts the next scraper 5. The striking lever 302 oscillates periodically under the action of the scraper 5, thereby driving the cam 203 to rotate back and forth. The cam 203 drives the roller 201 to roll. The roller 201 supports the receiving rod 104 and the sensing plate 103. Under the constraint of the limiting hole, it generates displacement, and the distance between it and the proximity switch 102 changes, transmitting the on / off signal and frequency.

[0061] The swing frequency of the connecting lever 301 and the impact lever 302 is positively correlated with the moving speed of the scraper blade 5 of the scraper conveyor. There are two scraper conveyor chain breakage detection devices. The chain breakage and chain deviation can be determined based on the feedback signal frequency from the two devices. When the swing frequency of the impact lever 302 is lower than a set threshold, the scraper conveyor chain is considered broken. When the difference in swing frequency between the two scraper conveyor chain breakage detection devices is greater than a set threshold, the scraper conveyor chain is considered deviated.

[0062] The proximity switch 102 is a photoelectric proximity switch, and the sensing element 103 is a metal material that can sense distance. When the distance is below or above a set threshold, it transmits an on / off signal. The proximity switch 102 has a certain length, and the sensing distance with the sensing element 103 can be controlled by adjusting the fixing bolt 101. When the cam 203 rotates back and forth, it can periodically rotate the sensing element 103 into and out of the sensing area of ​​the proximity switch 102. The proximity switch 102 sends a periodic signal according to the change in the distance below. When the impact lever 302 is in the plumb position, the sensing element 103 is rotated into the top position of the proximity switch 102. When the scraper 5 pushes the impact lever 302 to the highest position, the sensing element 103 rotates out of the sensing area of ​​the proximity switch 102. By arranging two sets of proximity switches 102 on the single-sided scraper conveyor chain breakage detection device, the false alarm rate can be reduced and the equipment stability can be improved. The proximity switch 102 is electrically connected to the control device, which is a PLC module. The control device is electrically connected to the control cabinet of the scraper conveyor and can send signals through the PLC module to control the scraper conveyor to stop.

[0063] Working Principle: During normal operation of the scraper conveyor, the chains at both ends of the scraper 5 are subjected to relatively uniform force, the scraper 5 remains perpendicular to its direction of movement, and its speed is also relatively uniform, staying within the normal operating speed range. At this time, the oscillation period of the strike lever 302 is relatively stable, and the interval period of the signals emitted by the two sets on one side and four sets on both sides of the symmetrically arranged proximity switches 102 is also relatively stable. The PLC module of the control device stores the on / off cycle time of the proximity switches 102 during normal operation of the scraper conveyor. The PLC module compares the data measured by the proximity switches 102 with the stored range values. If a chain break occurs on one side, the scraper 5 will be subjected to uneven force, tilting, increasing the overall resistance, reducing the running speed of the scraper 5, and may even jam, resulting in uneven running speed. If the difference in the on / off cycle time interval of the proximity switches 102 on both sides exceeds the normal operating range, the control device will send a signal to stop the scraper conveyor. If a chain break occurs on both sides, the scraper 5 will stop completely. At this time, the proximity switches 102 on both sides will completely lose their periodic signals, and the control device will also stop the scraper conveyor.

[0064] In this application, the term "multiple" refers to two or more unless otherwise expressly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0065] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A chain breakage detection device for an apron machine, characterized by include: The housing is divided into a collection chamber and a transmission chamber by a limiting plate, and the limiting plate has a limiting hole. The signal acquisition mechanism includes a proximity switch and a sensing element disposed within the acquisition cavity, and a receiving rod; the receiving rod slides through the limiting hole, and one end of the receiving rod is connected to the sensing element; The transmission mechanism includes a roller, a support shaft, and a cam disposed in the transmission cavity; the roller is connected to the other end of the receiving rod, and the cam is rotatably mounted on the support shaft and abuts against the roller; A lever mechanism is fixedly connected to the cam and can rotate around the support shaft with the cam, and is used to generate periodic oscillations when flicked by the scraper. A control device, which is electrically connected to the proximity switch.

2. The chain breakage detection device of claim 1, wherein The proximity switch includes: A first proximity switch and a second proximity switch are provided opposite to each other and spaced apart, and the sensing element is located between the first proximity switch and the second proximity switch.

3. The chain breakage detection device of claim 2, wherein Both the first proximity switch and the second proximity switch are photoelectric proximity switches, and the photoelectric proximity switches are installed on the inner wall of the acquisition cavity by adjustable fixing bolts.

4. The chain breakage detection device of claim 1, wherein The lever mechanism includes: A connecting lever, one end of which is fixedly connected to the cam; A strike-bearing lever, the other end of which is detachably connected to the connecting lever.

5. The chain breakage detection device of claim 4, wherein The strike-bearing lever has a multi-chamber rubber damping layer inside, a polyurethane coating layer on the outside, and a wavy wear-resistant texture on the bottom contact surface.

6. The scrapper machine chain break detection device according to any one of claims 1 to 5, characterized in that, Also includes: A fixing device is provided at the bottom of the box body, and a first guide groove is provided on the fixing device. The lever mechanism is oscillatingly inserted through the first guide groove.

7. The scrapper chain break detection device according to any one of claims 1 to 5, characterized in that, The working surface of the cam is an asymmetrical curved surface, and the lift curve of the cam is linearly related to the running speed of the scraper.

8. The scrapper machine chain break detection device according to any one of claims 1 to 5, characterized in that, The roller surface is covered with a polyurethane wear-resistant layer, and a solid dry film lubricating coating is attached to the contact surface between the roller and the cam.

9. A screed machine characterized by, include: The scraper conveyor chain breakage detection device as described in any one of claims 1 to 8.

10. The screed machine of claim 9, wherein, Also includes: Organism; A conveying trough is provided on the machine body; A cover plate is disposed on the top of the machine body, and a second guide groove corresponding to the first guide groove is provided on the cover plate; The drive unit is located at one end of the body; The first chain and the second chain are arranged opposite each other on both sides of the conveying groove and are driven by the drive unit; Multiple scrapers are spaced apart between the first chain and the second chain; The scraper conveyor chain breakage detection device is installed on the cover plate, and the lever mechanism extends through the second guide groove on the cover plate into the conveying groove and interferes with the movement trajectory of the scraper, so that the scraper can periodically move the lever mechanism during operation.

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