Scraper chain tensioning device and scraper

Abstract

The utility model discloses a scraper conveyor chain tensioning device and a scraper conveyor, and relates to the technical field of scraper conveyors, the scraper conveyor chain tensioning device comprises a driving assembly, an elastic piece and a transmission rod, the driving assembly comprises a driving piece and a pressed plate, the driving piece is located between a driving wheel and a driven wheel, and the elastic piece is located between the driving wheel and the driven wheel. The outer wall of a telescopic shaft of the driving part is sleeved with the pressed plate and the elastic part, and the driving part can drive the driven shaft to move in the direction away from the driving shaft through the pressed plate, the elastic part and the transmission rod so as to tension the conveying chain. According to the technical scheme, the driving piece and the transmission rod are adopted to drive the driven shaft to move in the direction away from the driving shaft, so that the tensioning degree of the conveying chain is accurately adjusted, it is guaranteed that the chain can keep the proper sag, the phenomena of abnormal meshing, tooth skipping, chain disengaging and the like are prevented, the conveying chain can operate more smoothly, and the service life of the conveying chain is prolonged. The conveying efficiency of the whole scraper is improved, and then the transfer efficiency of the fine washing coal is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to scraper technology field especially relates to a scraper chain tensioner and scraper. BACKGROUND

[0002] Raw coal is mixed with a large amount of impurities in the mining process, which not only reduces the quality of coal, but also may cause negative effects on the subsequent combustion or processing. Therefore, it is necessary to remove the impurities in the raw coal by washing coal, and the finished coal produced in the washing process is usually called fine washed coal, which can be used as fuel.

[0003] When the fine washed coal in the stockyard is taken, the fine washed coal needs to be transferred to the belt conveyor on the ground by the scraper, and then output by the belt conveyor. However, when the fine washed coal is transferred by the traditional scraper, the chain needs to be tensioned frequently, which consumes time and leads to low transfer efficiency. SUMMARY

[0004] The main purpose of the utility model is to provide a scraper chain tensioner and scraper, which aims to solve the problem of how to improve the transfer efficiency of the scraper.

[0005] To achieve the above purpose, the utility model provides a scraper chain tensioner, which comprises a driving assembly, an elastic member and a transmission rod. The driving assembly comprises a driving member and a pressure plate. The driving member is located between a driving shaft and a driven shaft. The pressure plate and the elastic member are both sleeved on the outer wall of the telescopic shaft of the driving member, and the pressure plate is connected with the outer wall of the telescopic shaft of the driving member. One end of the transmission rod close to the driving member is provided with a containing cavity for accommodating the elastic member. One end of the elastic member is connected with the pressure plate, and the other end of the elastic member can abut against the cavity wall of the containing cavity. The other end of the transmission rod away from the driving member can abut against the driven shaft. The driving member can drive the driven shaft to move away from the driving shaft through the pressure plate, the elastic member and the transmission rod to tension the conveying chain.

[0006] In an embodiment, the transmission rod comprises a rod body and a cylinder. One end of the rod body close to the driving member is provided with a mounting cavity for accommodating the cylinder. The cylinder comprises a side wall and a bottom wall, which enclose the containing cavity for accommodating the elastic member. The bottom wall is connected with the cavity wall of the mounting cavity. The bottom wall is provided with a through hole for the telescopic shaft of the driving member to pass through. The elastic member can abut against the bottom wall.

[0007] In an embodiment, one end of the rod body away from the mounting cavity is provided with a gap slot for the driven shaft to pass through. The slot wall of the gap slot can abut against the driven shaft.

[0008] In an embodiment, the rod body is further provided with an opening in communication with the accommodation slot.

[0009] In an embodiment, the elastic member comprises a spring.

[0010] In an embodiment, the driving assembly comprises a hydraulic cylinder.

[0011] In addition, the utility model discloses a scraper, the scraper includes the scraper chain tensioner of any one of the above technical solutions, and the scraper further includes:

[0012] An arm support, the driving member is connected with the arm support;

[0013] A driving shaft, rotatably installed at one end of the arm support;

[0014] A driven shaft, rotatably installed at the other end of the arm support;

[0015] A sprocket mechanism, comprising a driving sprocket, a driven sprocket, a conveying chain and a plurality of scrapers, the driving sprocket is sleeved on the outer wall of the driving shaft, and the driving sprocket is connected with the outer wall of the driving shaft, the driven sprocket is sleeved on the outer wall of the driven shaft, and the driven sprocket is connected with the outer wall of the driven shaft, the conveying chain is wound around the driving sprocket and the driven sprocket, and a plurality of scrapers are arranged at intervals along the outer wall of the conveying chain.

[0016] In an embodiment, the arm support is provided with a first chain guide and a second chain guide for the conveying chain to pass through on the two sides arranged oppositely in the first direction, and the first chain guide and the second chain guide extend along the conveying direction; each scraper is provided with a first wear-resistant lining plate and a second wear-resistant lining plate on the two sides arranged oppositely along the axial direction of the driving shaft, and the first direction and the second direction are arranged perpendicularly.

[0017] In an embodiment, the scraper further includes a driving mechanism and a support seat, the driving mechanism comprises a motor and a speed reducer, the motor is connected with the support seat, the output end of the motor is connected with the speed reducer, and the output end of the speed reducer is connected with the driving shaft, so that the motor can drive the driven shaft to rotate through the speed reducer, the driving shaft and the sprocket mechanism.

[0018] In an embodiment, the number of sprocket mechanisms is at least one.

[0019] In this embodiment of the invention, the driving component provides power to the scraper conveyor chain tensioning device. The two ends of the elastic element abut against the walls of the receiving cavity of the pressure plate and the transmission rod, respectively. The main function of the receiving cavity is to provide a fixed installation space for the elastic element, thereby ensuring that the elastic element can work in the correct position and that it will not deviate from the predetermined path during compression or extension. When tensioning of the conveyor chain is required, the driving component starts working. The telescopic shaft of the driving component drives the elastic element to abut against the wall of the receiving cavity and gradually compresses the elastic element, thereby driving the transmission rod and the driven shaft to move away from the driving shaft to tension the conveyor chain. Due to the presence of the elastic element, the tension of the conveyor chain is buffered. In the initial stage, the force applied to the drive rod and driven shaft increases gradually, rather than reaching its maximum value instantaneously. This avoids applying excessive impact force to the scraper conveyor suddenly, reduces the impact and vibration during startup, lowers the risk of operating noise and wear, and extends the service life of the equipment. As the telescopic shaft of the drive component continues to extend, the elastic element is further compressed until the compressive force of the elastic element balances the thrust provided by the drive component. In this process, the loading of force is a gradual process, making the response of the entire system smoother and more stable. This utility model embodiment uses a driving component and a transmission rod to move the driven shaft away from the driving shaft, thereby adjusting the shaft distance between the driven sprocket and the driving sprocket. This precisely adjusts the tension of the conveyor chain, ensuring that the chain maintains appropriate sag, helping to avoid problems such as excessively loose chains. This prevents abnormal meshing, tooth skipping, and chain slippage, allowing the conveyor chain to operate more smoothly, reducing unnecessary resistance, improving the overall conveying efficiency of the scraper conveyor, and thus improving the transfer efficiency of finely washed coal. At the same time, reasonable chain tension also reduces wear between the chain and sprockets, lowers maintenance frequency and costs, extends the service life of related components, and improves the overall reliability of the scraper conveyor. By using elastic components to buffer the tension of the conveyor chain, the impact and vibration on the driven shaft during startup can be significantly reduced, operating noise can be reduced, and the service life of the equipment can be extended, making the response of the entire scraper conveyor chain tensioning device smoother and more stable. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the scraper conveyor of this utility model;

[0022] Figure 2 forFigure 1 Close-up view at middle A.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 100, scraper chain tensioning device; 1, driving assembly; 11, driving piece; 12, pressure plate; 2, elastic piece; 3, transmission rod; 31, rod body; 311, installation cavity; 312, let place slot; 313, opening; 32, cylinder; 321, side wall; 322, bottom wall; 3221, through hole; 323, containing cavity;

[0025] 200, scraper; 210, arm support; 220, driving shaft; 230, driven shaft; 240, sprocket mechanism; 2401, driving sprocket; 2402, driven sprocket; 2403, conveying chain; 2404, scraper; 250, first chain guide groove; 260, second chain guide groove.

[0026] The realization, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0028] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back), the directional indications are only used to explain the relative position relationship, movement condition and the like between components in a certain specific posture, and if the specific posture changes, the directional indications also change accordingly.

[0029] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0030] Raw coal mixed with a large amount of impurities in the mining process, these impurities not only reduce the quality of coal, but also may cause negative impact on the subsequent combustion or processing process. Therefore, the impurities in the raw coal need to be removed by washing coal, the finished coal produced in the washing process is usually called fine washing coal, and the fine washing coal can be used as fuel.

[0031] The fine washing coal in the stockyard needs to be transferred to the belt conveyor on the ground by the scraper conveyor when it is taken, and then output by the belt conveyor. However, when the fine washing coal is transferred by the traditional scraper conveyor, the chain needs to be tensioned frequently, which consumes time and leads to low transfer efficiency.

[0032] After careful research by the applicant, it is found that the chain of the scraper conveyor will be loose during long-term use. If the chain is not tensioned in time, the chain and the sprocket will not be normally engaged, the chain will jump or be off, which will interrupt the transmission process and may cause serious mechanical failure. At present, the chain is usually tensioned manually by regular manual adjustment, which requires long time shutdown and leads to low transfer efficiency.

[0033] The main purpose of the utility model is to provide a scraper conveyor chain tensioning device and a scraper conveyor to solve the problem of how to improve the transfer efficiency of the scraper conveyor.

[0034] Please refer to Figure 1 and Figure 2In the embodiment of the utility model, the scraper chain tensioning device 100 includes a driving assembly 1, an elastic member 2 and a transmission rod 3, the driving assembly 1 includes a driving member 11 and a pressure plate 12, the driving member 11 is located between the driving shaft 220 and the driven shaft 230, the pressure plate 12 and the elastic member 2 are both sleeved on the outer wall of the telescopic shaft of the driving member 11, and the pressure plate 12 is connected with the outer wall of the telescopic shaft of the driving member 11;The end of the transmission rod 3 close to the driving member 11 is provided with a containing cavity 323 for containing the elastic member 2, one end of the elastic member 2 is connected with the pressure plate 12, the other end of the elastic member 2 can abut against the cavity wall of the containing cavity 323, the end of the transmission rod 3 away from the driving member 11 can abut against the driven shaft 230, and the driving member 11 can drive the driven shaft 230 to move in the direction away from the driving shaft 220 to tension the conveying chain 2403 through the pressure plate 12, the elastic member 2 and the transmission rod 3.

[0035] In the embodiment of the utility model, the driving member 11 can provide power for the scraper chain tensioning device 100, the two ends of the elastic member 2 abut against the cavity wall of the containing cavity 323 of the pressure plate 12 and the transmission rod 3 respectively, the main role of the containing cavity 323 is to provide a fixed installation space for the elastic member 2, so as to ensure that the elastic member 2 can work in the correct position, so that the elastic member 2 can not deviate from the predetermined path in the compression or stretching process, when the conveying chain 2403 needs to be tensioned, the driving member 11 starts to work, the telescopic shaft of the driving member 11 drives the elastic member 2 to abut against the cavity wall of the containing cavity 323 and gradually compresses the elastic member 2, so as to drive the transmission rod 3 and the driven shaft 230 to move in the direction away from the driving shaft 220 to tension the conveying chain 2403, due to the existence of the elastic member 2, the tensioning of the conveying chain 2403 plays a buffering role, in the initial stage, the force applied to the transmission rod 3 and the driven shaft 230 is gradually increased, instead of reaching the maximum value instantaneously, which avoids suddenly applying excessive impact force to the scraper 200, reduces the impact and vibration during starting, reduces the risk of noise and wear during operation, prolongs the service life of the equipment, as the telescopic shaft of the driving member 11 continues to extend, the elastic member 2 is further compressed, until the compression force of the elastic member 2 balances with the thrust provided by the driving member 11, in this process, the loading of force is a gradual process, so that the response of the whole system is more gentle and stable.

[0036] The technical scheme of the utility model discloses drive member 11 and transmission rod 3 drive driven shaft 230 to the direction of moving away from the driving shaft, and then adjust the axle distance of driven sprocket 2402 and drive sprocket 2401, so that the tension degree of conveying chain 2403 is accurately adjusted, ensure that the chain can keep proper sag, help to avoid the problem of chain slack, thereby prevent the occurrence of abnormal engagement, tooth skipping and chain off and other phenomena, so that conveying chain 2403 can run more smoothly, reduce unnecessary resistance, improve the conveying efficiency of entire scraper 200, and then improve the transfer efficiency of fine coal, meanwhile, reasonable chain tension also reduces the wear and tear between chain and sprocket, reduces the maintenance frequency and cost, prolongs the service life of relevant components, and improves the overall reliability of scraper 200.

[0037] Please refer to Figure 2 In an embodiment, the transmission rod 3 includes a rod body 31 and a cylinder 32, the rod body 31 is provided with a mounting cavity 311 for accommodating the cylinder 32 at one end close to the drive member 11, the cylinder 32 includes a side wall 321 and a bottom wall 322, the side wall 321 and the bottom wall 322 are closed to form a containing cavity 323 containing the elastic member 2, the bottom wall 322 is connected with the cavity wall of the mounting cavity 311, the bottom wall 322 is provided with a through hole 3221 through which the telescopic shaft of the drive member 11 passes, and the elastic member 2 can abut against the bottom wall 322; specifically, the bottom wall 322 is connected with the cavity wall of the mounting cavity 311 on the rod body 31, which provides a stable support point for the elastic member 2, so that the elastic member 2 can correctly act on the rod body 31 when being pressed, the bottom wall 322 is provided with a through hole 3221, so that the telescopic shaft of the drive member 11 can conveniently extend and retract, the containing cavity 323 on the cylinder 32 plays a positioning and guiding role on the elastic member 2, so that the elastic member 2 can be compressed and released along the direction from the driving shaft 220 to the driven shaft 230, unnecessary influence of lateral force on the elastic member 2 is avoided, the stability and consistency of the entire scraper chain tensioning device 100 are helped to be maintained, and the cylinder 32 also plays a protection role on the elastic member 2, the elastic member 2 is completely wrapped in the containing cavity 323 formed by the side wall 321 and the bottom wall 322, the influence of external factors such as dust and oil stains on the elastic member 2 is avoided, and the stability and reliability of the entire scraper chain tensioning device 100 are improved.

[0038] Please refer to Figure 2In an embodiment, the rod body 31 is provided with a clearance slot 312 at one end away from the mounting cavity 311 for the driven shaft 230 to pass through, and the slot wall of the clearance slot 312 can abut against the driven shaft 230; specifically, the clearance slot 312 provides accurate positioning of the driven shaft 230, helps to maintain the accuracy of the action of the scraper chain tensioning device 100, ensures that the chain always maintains a proper tensioning state, and by providing the clearance slot 312, the transmission rod 3 can directly apply force to the driven shaft 230, reducing energy loss and improving tensioning efficiency. Compared with other designs that may require additional connecting parts, the clearance slot 312 is directly used to achieve contact with the driven shaft 230, simplifying the overall structure, reducing manufacturing costs, and being easy to assemble and maintain, and also reducing wear and tear between the rod body 31 and the driven shaft 230, thereby prolonging the service life of the rod body 31. According to the needs of different application scenarios, the shape and size of the clearance slot 312 can be adjusted, so that the scraper chain tensioning device 100 can be applied to a variety of different specifications of driven shafts 230, thereby enhancing the application flexibility of the scraper chain tensioning device 100.

[0039] Referring to Figure 2 In an embodiment, the rod body 31 is further provided with an opening 313 communicating with the clearance slot 312; specifically, in this embodiment, the shape of the clearance slot 312 is adapted to the size of the outer wall of the driven shaft 230, and the opening 313 communicates with the clearance slot 312 to form a U-shaped structure. By providing the opening 313, the driven shaft 230 can more easily enter or exit the clearance slot 312, thereby simplifying the installation process and reducing assembly time and difficulty. When the driven shaft 230 needs to be inspected, lubricated or replaced, the opening 313 provides a convenient passage, improving maintenance efficiency. The presence of the opening 313 can also help the rod body 31 to be compatible with different diameters or types of driven shafts 230, thereby enhancing the application range of the scraper chain tensioning device 100.

[0040] Referring to Figure 2In an embodiment, the elastic member 2 comprises a spring; specifically, the tension of the chain can be accurately adjusted according to the compression amount of the spring, the proper sag of the conveying chain 2403 is ensured, the occurrence of abnormal meshing, tooth skipping and chain disengagement is avoided, the spring can also absorb the impact force from the chain or other components, plays a buffering role, reduces the impact on the entire scraper 200, helps to reduce the vibration degree and noise during the operation of the chain, ensures the smoother operation of the conveying chain 2403, and improves the conveying efficiency; the spring can withstand repeated compression and stretching and is not prone to fatigue failure, thus greatly prolonging the service life of the scraper chain tensioning device 100, enhancing the reliability and durability of the entire scraper chain tensioning device 100, and the spring, as a standardized and widely used mechanical component, has low cost and is easy to obtain, which not only simplifies the design process but also reduces the manufacturing cost, in addition, the installation and replacement of the spring are relatively simple, which is conducive to daily maintenance.

[0041] According to an embodiment of the utility model, the elastic member 2 comprises an elastic rubber member or a polyurethane elastomer, which plays a buffering role in tensioning the conveying chain 2403, reduces the impact and vibration on the driven shaft 230 during startup, reduces the running noise, and makes the response of the entire scraper chain tensioning device 100 more gentle and stable.

[0042] Please refer to Figure 2 In an embodiment, the drive assembly 1 comprises a hydraulic cylinder; specifically, the hydraulic cylinder has a relatively fast action speed, can complete the chain tensioning or loosening process in a short time, improves the operation flexibility and response speed of the scraper chain tensioning device 100, the hydraulic cylinder can realize fine adjustment of the chain tensioning force, keeps the chain in the best working state, reduces unnecessary wear and tear and improves the operation efficiency, the hydraulic cylinder also has good overload resistance and self-protection mechanism, can automatically stop or slow down the action when encountering abnormal conditions, thereby ensuring the safe operation of the scraper chain tensioning device 100, and the hydraulic cylinder has strong resistance to temperature changes, dust and humidity, etc., is suitable for application in harsh environments in the mining, metallurgy and other industries, and can reduce the maintenance frequency and cost. In the embodiment, the scraper chain tensioning device 100 further comprises a hydraulic oil source, which is in communication with the cylinder barrel of the hydraulic cylinder, thereby providing hydraulic oil for the hydraulic cylinder.

[0043] According to an embodiment of the utility model, the drive assembly 1 comprises an electric push rod or a cylinder, which drives the driven shaft 230 to move away from the driving shaft 220 through the elastic member 2 and the transmission rod 3 to tension the conveying chain 2403.

[0044] Please refer to Figure 1The utility model discloses still put forward a kind of scraper 200, the scraper 200 includes jib 210, drive shaft 220, driven shaft 230, sprocket mechanism 240 and scraper chain tensioner 100, the specific structure of the scraper chain tensioner 100 refers to above-mentioned embodiment, since the scraper 200 of the present application adopts all technical solutions of above-mentioned all embodiments, at least have all beneficial effects brought by the technical scheme of above-mentioned embodiment, here no longer one by one elaboration.Equipment application range and flexibility can be applied to the conveying task of multiple types of materials.

[0045] Please refer toFigure 1 and Figure 2 In an embodiment, the arm support 210 is provided with a first chain guide groove 250 and a second chain guide groove 260 on the two sides of the arm support 210 respectively, the first chain guide groove 250 and the second chain guide groove 260 are arranged along the conveying direction, and each scraper 2404 is provided with a first wear-resistant lining plate (not shown in the figure) and a second wear-resistant lining plate (not shown in the figure) on the two sides of the scraper 2404 respectively. Specifically, the first direction is the up-down direction, the conveying direction of the scraper machine 200 is the left-right direction, the first chain guide groove 250 and the second chain guide groove 260 provide a clear running path for the conveying chain 2403, ensure that the conveying chain 2403 can move stably during work, avoid deviating from the track or unnecessary friction, and also prevent materials from entering the interior of the scraper machine 200, avoiding the wear or damage of the internal components of the scraper machine 200; the first wear-resistant lining plate and the second wear-resistant lining plate can avoid the direct contact between the scraper 2404 and the first chain guide groove 250 and the second chain guide groove 260, significantly reduce the wear speed of the scraper 2404 during transportation, not only prolong the service life of the scraper 2404, but also reduce the replacement frequency and the maintenance cost.

[0046] Please refer to Figure 1 In an embodiment, the scraper machine 200 further comprises a driving mechanism (not shown in the figure) and a support seat (not shown in the figure), the driving mechanism comprises a motor (not shown in the figure) and a speed reducer (not shown in the figure), the motor is connected with the support seat, the output end of the motor is connected with the speed reducer, and the output end of the speed reducer is connected with the driving shaft 220, so that the motor can drive the driven shaft 230 to rotate through the speed reducer, the driving shaft 220 and the sprocket mechanism 240; specifically, the support seat provides a stable installation basis for the motor, ensures that the motor will not displace or vibrate during operation, and also bears part of the weight distribution of the scraper machine 200, the output end of the motor is connected with the speed reducer, which converts high-speed rotation into low-speed high-torque output suitable for the sprocket mechanism 240, and the output end of the speed reducer is connected with the driving shaft 220, finally driving the sprocket mechanism 240 to work; the effective combination of the motor and the speed reducer ensures efficient power transmission, reduces energy loss, improves the transmission efficiency of the entire scraper machine 200, and a wide speed adjustment range can be achieved by selecting an appropriate speed reduction ratio, which can adapt to the material conveying requirements under different working conditions, and the motor and the speed reducer are standard components, which are convenient for regular inspection and maintenance, and can be quickly replaced if there is a problem, reducing maintenance time and cost. In this embodiment, the motor can be a servo motor, which has higher action accuracy, or a stepper motor, thereby reducing production cost; the speed reducer can be a direct-orthogonal shaft speed reducer, which has high transmission accuracy, is suitable for accurate control of speed and torque, has small size, low noise during operation and long service life.

[0047] In an embodiment, the number of sprocket mechanisms 240 is at least one; specifically, the user can choose the appropriate number of sprocket mechanisms 240 according to actual needs, neither waste resources, nor ensure optimal performance, so as to maximize economic benefits, by increasing the number of sprocket mechanisms 240, the overall carrying capacity of the scraper 200 can be improved, which is suitable for handling heavy materials or high-density material flow, multiple sprocket mechanisms 240 help to disperse the load, avoiding the damage of a single sprocket mechanism 240 due to excessive local pressure, prolonging the service life and reducing the maintenance frequency, improving the durability and stability of the scraper 200, multiple sprocket mechanisms 240 can also effectively extend the conveying distance, which is suitable for large factories or mines and other places, ensuring that the materials can be smoothly transmitted in a larger range. In the present embodiment, the number of sprocket mechanisms 240 is two, and the two sprocket mechanisms 240 are arranged in sequence along the axial direction of the driving shaft 220, adopting the form of double-row sprocket mechanism 240 transmission, so that the transmission efficiency is higher, the carrying capacity is stronger, the reliability is stronger, and the operation is more stable, and it is also easy to maintain.

[0048] The above is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application, any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A flight bar chain tensioning device characterized by, The scraper chain tensioning device comprises a driving assembly, an elastic member and a transmission rod, the driving assembly comprises a driving member and a pressure plate, the driving member is located between a driving shaft and a driven shaft, the pressure plate and the elastic member are sleeved on the outer wall of the telescopic shaft of the driving member, and the pressure plate is connected with the outer wall of the telescopic shaft of the driving member; one end of the transmission rod close to the driving member is provided with a containing cavity for containing the elastic member, one end of the elastic member is connected with the pressure plate, the other end of the elastic member can abut against the cavity wall of the containing cavity, the other end of the transmission rod away from the driving member can abut against the driven shaft, and the driving member can drive the driven shaft to move away from the driving shaft through the pressure plate, the elastic member and the transmission rod to tension the conveying chain.

2. The scraper chain tensioner of claim 1, wherein, The transmission rod comprises a rod body and a cylinder, one end of the rod body close to the driving member is provided with a mounting cavity for containing the cylinder, the cylinder comprises a side wall and a bottom wall, the side wall and the bottom wall enclose the containing cavity for containing the elastic member, the bottom wall is connected with the cavity wall of the mounting cavity, the bottom wall is provided with a through hole for the telescopic shaft of the driving member to pass through, and the elastic member can abut against the bottom wall.

3. The scraper chain tensioner of claim 2, wherein, One end of the rod body away from the mounting cavity is provided with a gap slot for the driven shaft to pass through, and the slot wall of the gap slot can abut against the driven shaft.

4. The scraper chain tensioner of claim 3, wherein, The rod body is also provided with an opening in communication with the gap slot.

5. A flighted chain tensioner according to any one of claims 1 to 4, characterised in that, The elastic member comprises a spring.

6. A flighted chain tensioner according to any one of claims 1 to 4, characterised in that, The driving assembly comprises a hydraulic cylinder.

7. A screed machine characterized by The scraper comprises the scraper chain tensioning device as claimed in any one of claims 1 to 6, and further comprises: an arm support, the driving member is connected with the arm support; a driving shaft, the driving shaft is rotatably installed at one end of the arm support; a driven shaft, the driving shaft is rotatably installed at the other end of the arm support; a sprocket mechanism, the sprocket mechanism comprises a driving sprocket, a driven sprocket, a conveying chain and a plurality of scrapers, the driving sprocket is sleeved on the outer wall of the driving shaft, and the driving sprocket is connected with the outer wall of the driving shaft, the driven sprocket is sleeved on the outer wall of the driven shaft, and the driven sprocket is connected with the outer wall of the driven shaft, the conveying chain is arranged around the driving sprocket and the driven sprocket, and a plurality of the scrapers are arranged at intervals along the outer wall of the conveying chain.

8. The screed machine of claim 7, wherein, The two sides of the arm support relatively arranged along a first direction are respectively provided with a first chain guide groove and a second chain guide groove for the conveying chain to pass through, and the first chain guide groove and the second chain guide groove both extend along the conveying direction; the two sides of each scraper relatively arranged along the axial direction of the driving shaft are respectively provided with a first wear-resistant lining plate and a second wear-resistant lining plate.

9. The screed machine of claim 7, wherein, The scraper further comprises a driving mechanism and a support seat, the driving mechanism comprises a motor and a speed reducer, the motor is connected with the support seat, the output end of the motor is connected with the speed reducer, and the output end of the speed reducer is connected with the driving shaft, so that the motor can drive the driven shaft to rotate through the speed reducer, the driving shaft and the sprocket mechanism.

10. The screed machine of claim 7, wherein, The number of the sprocket mechanism is at least one.

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