A tensioning device and its belt conveyor

Abstract

The present invention belongs to the technical field of conveyors, and specifically relates to a tensioning device and a belt conveyor thereof; it includes a frame, a roller, a conveyor belt, a motor and a controller, and further includes: a scraper, the scraper is rotatably installed on the frame, a torsion spring is installed at the rotation point, the end of the scraper contacts the surface of the roller, cams are fixedly connected to both ends of the roller, a dial is fixedly connected to the scraper on the side close to the cam, and the dial contacts the cam; a diversion groove, the diversion groove is installed on the frame, and the diversion groove is arranged below the scraper; in order to solve the problem that impurities between the conveyor belt and the roller are likely to cause breakage; in the present invention, by arranging the scraper, the impurities on the surface of the roller are cleaned, so as to ensure the cleanliness of the roller surface, prevent the conveyor belt from being scratched or torn due to impurities, and ensure good friction between the conveyor belt and the roller to prevent slipping, thereby protecting the conveyor belt.

Description

Technical Field

[0001] The present invention belongs to the technical field of conveyors, and specifically relates to a tensioning device and a belt conveyor thereof. Background Art

[0002] A belt conveyor is a machine that uses friction drive to continuously transport materials. It mainly consists of a frame, a conveyor belt, idlers, drums, a tensioning device, a transmission device, etc. It can form a material transportation process for materials on a certain conveyor line from the initial feeding point to the final discharging point. It can transport both bulk materials and finished items.

[0003] During the operation of the belt conveyor, sharp foreign objects such as gangue and iron parts are brought into the space between the drum and the conveyor belt, causing scratches and even tearing of the conveyor belt. On the other hand, the driving drum is sticky with oil, frozen, and coal slime water or other materials enter the space between the drum and the conveyor belt, reducing the friction coefficient between the conveyor belt and the driving roller, resulting in slipping and causing the conveyor belt to break, affecting production and even endangering the safety of the staff.

[0004] In view of this, the present invention proposes a tensioning device and a belt conveyor thereof, which solve the above technical problems. Summary of the Invention

[0005] In order to solve the deficiencies of the prior art, the present invention proposes a tensioning device and a belt conveyor thereof; by providing a scraper to clean the impurities on the surface of the drum, thereby ensuring the cleanliness of the drum surface, preventing the conveyor belt from being scratched or torn due to impurities entering the space between the drum and the conveyor belt, and ensuring good friction between the conveyor belt and the drum to prevent slipping, thereby protecting the conveyor belt, ensuring the normal operation of the conveyor, and further ensuring normal production and improving the safety of the operators, thus solving the problem that the conveyor belt is prone to breakage due to impurities between the conveyor belt and the drum.

[0006] The technical solution adopted by the present invention to solve its technical problems is: A belt conveyor according to the present invention includes a frame, a drum, a conveyor belt, a motor and a controller, and further includes:

[0007] A scraper, the scraper is rotatably installed on the frame, a torsion spring is installed at the rotation point, the end of the scraper is in contact with the surface of the drum, cams are fixedly connected to both ends of the drum, a dial is fixedly connected to the scraper on the side close to the cam, and the dial is in contact with the cam;

[0008] A diversion groove, the diversion groove is installed on the frame, and the diversion groove is arranged below the scraper.

[0009] Preferably, a support plate is fixedly installed at the bottom of the conveyor belt of the frame, a guide roller is rotatably connected to the support plate, and the height of the outer edge of the guide roller is higher than that of the support plate.

[0010] Preferably, a fixing plate is fixedly installed below the support plate of the frame, and a support spring is fixedly connected between the fixing plate and the support plate.

[0011] Preferably, sliding frames are slidably installed at both ends of the roller of the frame, the roller is rotatably installed on the sliding frames, and a tension spring is fixedly connected between the sliding frames and the frame.

[0012] Preferably, the support plate is slidably connected to the frame, and the rotating end of the support plate is in frictional contact with the scraper.

[0013] Preferably, a dust collection box is installed inside the conveyor belt of the frame, and the bottom of the dust collection box is in close contact with the inner side of the conveyor belt.

[0014] Preferably, a diversion plate is fixedly connected inside the dust collection box, the diversion groove extends to both ends of the dust collection box, and waste discharge ports are opened at both ends of the dust collection box.

[0015] Preferably, a driven rod is slidably installed on one side of the diversion groove close to the cam, a return spring is fixedly connected between the driven rod and the diversion groove, the return spring is used to press the top end of the driven rod against the cam, and a vibrating plate is fixedly connected to the bottom end of the driven rod.

[0016] Preferably, a brush is fixedly connected to the bottom of the vibrating plate, and the brush is in contact with the inner side surface of the conveyor belt.

[0017] A tensioning device according to the present invention is provided on the above belt conveyor, and the tensioning device includes:

[0018] Movable rollers, there are a pair of movable rollers, and the movable rollers are respectively in contact with the inner surface and the outer surface of the conveyor belt;

[0019] Fixed rollers, the fixed rollers are fixedly installed on the frame, a traction rope is pulled on the fixed rollers, and both ends of the traction rope are respectively fixed on the rotating shafts of the movable rollers;

[0020] A heavy weight, pulleys are installed on both sides of the heavy weight, and the pulleys slide on the traction rope.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. A tensioning device and a belt conveyor according to the present invention clean impurities on the surface of the roller by providing a scraper, thereby ensuring the cleanliness of the roller surface, preventing the conveyor belt from being scratched or torn due to impurities entering between the roller and the conveyor belt, and ensuring good friction between the conveyor belt and the roller to prevent slipping, thereby protecting the conveyor belt, ensuring the normal operation of the conveyor, and further ensuring normal production and improving the safety of operators.

[0023] 2. A tensioning device and a belt conveyor according to the present invention. When placing materials on the conveyor belt, the materials will generate a certain impact on the conveyor belt. During the impact, it is difficult for the tensioning device of the conveyor to quickly respond for tensioning adjustment, resulting in wear or even breakage. In the present invention, after the materials fall on the conveyor belt, the support plate supports the conveyor belt, thereby reducing the impact, reducing wear, preventing breakage due to excessive force, and providing guide rollers on the support plate and making the height of the guide rollers higher than that of the support plate, so that the rolling friction exists between the support plate and the conveyor belt, reducing the friction force between the support plate and the conveyor belt, thereby reducing the wear of the conveyor belt and effectively ensuring the service life of the conveyor belt.

[0024] 3. A tensioning device and a belt conveyor according to the present invention. When placing materials on the conveyor belt, the conveyor belt is depressed downward under the force. During the depression, the tension force on the conveyor belt increases, causing the tension spring to be compressed, reducing the center distance between the rollers, releasing a certain length of the conveyor belt. After the materials are reduced to a certain weight, the tension spring resets, thereby reducing the tension force on the conveyor belt, adjusting the tension force on the conveyor belt, reducing the impact on the conveyor belt, further protecting the conveyor belt. When the materials increase, the rollers move towards the center, making the contact between the rollers and the scraper closer, thereby improving the scraping effect of the scraper, so that when the materials increase, the surface of the roller remains clean, and the conveyor belt is not easily broken due to impurities entering between the roller and the conveyor belt.

[0025] 4. A tensioning device and a belt conveyor according to the present invention. During the operation of the conveyor belt, the dust collection box is in close contact with the inner side of the conveyor belt. The dust collection box scrapes off the impurities on the inner side of the conveyor belt and collects the impurities. When the impurities in the dust collection box accumulate to a certain extent, the impurities move along the diversion plate towards the waste discharge port and then are discharged from the waste discharge port, thereby automatically discharging the impurities from the dust collection box, reducing the impurities adhered to the inner side of the conveyor belt, keeping the inner side of the conveyor belt clean, preventing the impurities on the inner side of the conveyor belt from entering between the conveyor belt and the roller, thereby protecting the conveyor belt and further ensuring the normal operation of the conveyor belt. Brief Description of the Drawings

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1 is the perspective view of the present invention;

[0028] Figure 2 is the schematic diagram of the internal structure of the present invention;

[0029] Figure 3 is Figure 2 the partial enlarged view at position A in

[0030] In the figure: 1, frame; 11, scraper; 12, paddle; 13, sliding frame; 14, tension spring; 2, roller; 21, cam; 22, follower rod; 23, return spring; 24, vibrating plate; 25, brush; 3, conveyor belt; 4, diversion groove; 5, support plate; 51, guide roller; 6, fixing plate; 61, support spring; 7, dust collection box; 71, diversion plate; 72, waste discharge port; 81, movable roller; 82, fixed roller; 83, towing rope; 84, weight; 85, pulley. Detailed implementation manners

[0031] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0032] As Figures 1 to 3 shown, a belt conveyor according to the present invention includes a frame 1, a roller 2, a conveyor belt 3, a motor and a controller, and further includes:

[0033] A scraper 11, the scraper 11 is rotatably installed on the frame 1, a torsion spring is installed at the rotation position, the end of the scraper 11 contacts the surface of the roller 2, cam 21 is fixedly connected to both ends of the roller 2, a paddle 12 is fixedly connected to the scraper 11 on the side close to the cam 21, and the paddle 12 contacts the cam 21;

[0034] A diversion groove 4, the diversion groove 4 is installed on the frame 1, and the diversion groove 4 is arranged below the scraper 11;

[0035] During the operation of the belt conveyor, sharp foreign objects such as gangue and iron parts are brought into the space between the roller 2 and the conveyor belt 3, causing scratches and even tearing of the conveyor belt 3. On the other hand, the driving roller 2 is sticky with oil, frozen, and coal slime water or other materials enter the space between the roller 2 and the conveyor belt 3, reducing the friction coefficient between the conveyor belt 3 and the driving roller, causing slipping, resulting in the breakage of the conveyor belt 3, affecting production and even endangering the lives of workers;

[0036] In the present invention, by providing a scraper 11, when the conveyor is operating, the controller drives the motor, the motor drives the roller 2 to rotate, the roller 2 drives the conveyor belt 3 to operate, the material falls onto the conveyor belt 3 and moves from one end to the other end along the conveyor belt 3. During the rotation of the roller 2, the spiral spring causes the scraper 11 to always contact the surface of the roller 2. Thus, during the rotation of the roller 2, the scraper 11 removes the impurities on the surface of the roller 2. And since cams 21 are provided at both ends of the roller 2 and the paddles 12 on the scraper 11 contact the cams 21, when the roller 2 rotates, the roller 1 drives the cams 21 to rotate. When the cams 21 rotate, they squeeze the paddles 12, causing the paddles 12 to swing. When the paddles 12 swing, the paddles 12 push the scraper 11, thereby causing the scraper 11 to vibrate, facilitating the shaking off of the remaining impurities on the scraper 11. The impurities scraped off by the scraper 11 fall into the diversion trough 4 and flow out along the diversion trough 4, thereby cleaning the roller 2, preventing impurities from entering between the roller 2 and the conveyor belt 3, protecting the conveyor belt 3. In the present invention, by providing the scraper 11, the impurities on the surface of the roller 2 are cleaned, thus ensuring the cleanliness of the surface of the roller 2, preventing the conveyor belt 3 from being scratched or torn due to impurities entering between the roller 2 and the conveyor belt 3, and ensuring good friction between the conveyor belt 3 and the roller 2 to prevent slipping, thereby protecting the conveyor belt 3, ensuring the normal operation of the conveyor, and further ensuring normal production and improving the safety of the operators.

[0037] As an implementation manner of the present invention, a support plate 5 is fixedly installed at the bottom of the conveyor belt 3 on the frame 1, and a guide roller 51 is rotatably connected to the support plate 5, and the outer edge height of the guide roller 51 is higher than that of the support plate 5. During operation, by providing the support plate 5, when placing materials on the conveyor belt 3, the materials will cause a certain impact on the conveyor belt 3. During the impact, it is difficult for the tensioning device of the conveyor to quickly respond for tensioning adjustment, resulting in wear or even breakage. In the present invention, after the materials fall onto the conveyor belt 3, the support plate 5 supports the conveyor belt 3, thereby reducing the impact, reducing the wear, and preventing the conveyor belt 3 from breaking due to excessive force. And a guide roller 51 is provided on the support plate 5 and the height of the guide roller 51 is made higher than that of the support plate 5, so that the friction between the support plate 5 and the conveyor belt 3 is rolling friction, reducing the friction force between the support plate 5 and the conveyor belt 3, thereby reducing the wear of the conveyor belt 3 and effectively ensuring the service life of the conveyor belt 3.

[0038] As an embodiment of the present invention, the frame 1 is fixedly installed with a fixing plate 6 below the support plate 5, and a support spring 61 is fixedly connected between the fixing plate 6 and the support plate 5; during operation, by arranging the support spring 61 at the bottom of the support plate 5, when placing materials on the conveyor belt 3, the gravity of the materials acts on the conveyor belt 3, and the vertical force of the conveyor belt 3 acts on the support plate 5, and then acts on the support spring 61 on the fixed plate 6. The support spring 61 is compressed after being subjected to the force. When the material is reduced, the support spring 61 elastically resets to buffer and shock the support plate 5, thereby buffering the conveyor belt 3, reducing the impact, reducing the wear on the conveyor belt 3, and further protecting the conveyor belt 3.

[0039] As an embodiment of the present invention, the frame 1 is slidably mounted with sliding frames 13 at both ends of the roller 2, and the roller 2 is rotatably mounted on the sliding frame 13, and a tensioning spring 14 is fixedly connected between the sliding frame 13 and the frame 1; during operation, by setting the tensioning spring 14, when placing materials on the conveyor belt 3, the conveyor belt 3 is forced to sag downward, and when it sags, the conveyor belt 3 bends downward at the stressed part, and when the conveyor belt 3 bends downward, it drives the rollers 2 at both ends to slide toward the middle on the sliding frame 13, and the tensioning spring 14 is compressed when the roller 2 slides toward the middle on the sliding frame 13, so that The center distance between the rollers 2 is reduced, and a certain length of the conveyor belt 3 is released. After the material is reduced to a certain weight, the tensioning spring 14 is reset, thereby reducing the tensioning force on the conveyor belt 3. The tensioning force on the conveyor belt 3 is adjusted to reduce the impact on the conveyor belt 3 and further protect the conveyor belt 3. When the material increases, the roller 2 moves toward the center, making the contact between the roller 2 and the scraper 11 closer, thereby improving the scraping effect of the scraper 11, so that when the material increases, the surface of the roller 2 is still kept clean, so that the conveyor belt 3 is not easily broken due to impurities entering between the roller 2 and the conveyor belt 3.

[0040] As an embodiment of the present invention, the support plate 5 is slidably connected to the frame 1, and the support plate 5 and one end of the scraper 11 are in frictional contact with each other; when working, by arranging the scraper 11 below the support plate 5, when placing materials on the conveyor belt 3, the materials squeeze the conveyor belt 3, and the conveyor belt 3 pushes the support plate 5 downward, and the support plate 5 slides downward on the frame 1, and the support plate 5 and the rotating end of the scraper 11 rub against each other, thereby moving the scraper 11 to rotate, and the contact between the scraper 11 and the roller 2 is closer, thereby improving the cleaning ability of the scraper 11 on the surface of the roller 2, ensuring the normal operation of the conveyor belt 3, when the material is reduced to a certain weight, the support spring 61 elastically resets the support plate 5 to reset, thereby loosening the contact between the scraper 11 and the roller 2, reducing the wear of the scraper 11, ensuring the service life of the scraper 11, thereby ensuring the cleaning effect of the scraper 11, and then ensuring the normal operation of the conveyor.

[0041] As an embodiment of the present invention, a dust collection box 7 is installed inside the conveyor belt 3 of the frame 1. The bottom of the dust collection box 7 is in close contact with the inner side of the conveyor belt 3, and the dust collection box 7 is located below the reverse flow groove 4. During operation, by setting the dust collection box 7, during the operation of the conveyor belt 3, the dust collection box 7 is in close contact with the inner side of the conveyor belt 3. When the conveyor belt 3 moves, the dust collection box 7 scrapes the inner side wall of the conveyor belt 3, so that the dust collection box 7 scrapes off the impurities on the inner side of the conveyor belt 3 and collects the impurities. When the impurities in the integrated groove are collected to a certain extent, they are cleaned, reducing the impurities adhered to the inner side of the conveyor belt 3, thereby keeping the inner side of the conveyor belt 3 clean, preventing the impurities on the inner side of the conveyor belt 3 from entering between the conveyor belt 3 and the roller 2, thereby protecting the conveyor belt 3, and further ensuring the normal operation of the conveyor belt 3.

[0042] As an embodiment of the present invention, a flow guide plate 71 is fixedly connected inside the dust collection box 7. The flow guide groove 4 extends to both ends of the dust collection box 7, and waste discharge ports 72 are provided at both ends of the dust collection box 7. During operation, by setting the flow guide plate 71 and the waste discharge ports 72, the dust collection box 7 scrapes the impurities on the inner side of the conveyor belt 3 into the dust collection box 7. When the impurities in the dust collection box 7 accumulate to a certain extent, the impurities move along the flow guide plate 71 towards the waste discharge ports 72 and then are discharged from the waste discharge ports 72, thereby automatically discharging the impurities from the dust collection box 7, keeping the conveyor stable in operation, reducing the manual cleaning frequency, and reducing the labor intensity of the personnel.

[0043] As an embodiment of the present invention, a driven rod 22 is slidably installed on one side of the flow guide groove 4 close to the cam 21. A return spring 23 is fixedly connected between the driven rod 22 and the flow guide groove 4. The return spring 23 is used to press the top end of the driven rod 22 against the cam 21, and a vibration plate 24 is fixedly connected to the bottom end of the driven rod 22. During operation, by setting the vibration plate 24, when the conveyor belt 3 operates, the cams 21 at both ends of the roller 2 rotate. The return spring 23 presses the driven rod 22 against the cam 21, and the driven rod 22 slides up and down on one side of the flow guide groove 4 as the cam 21 rotates, thereby driving the vibration plate 24 to move up and down. The vibration plate 24 moves up and down to beat the conveyor belt 3, so that the impurities on the inner side of the conveyor belt 3 are beaten off the conveyor belt 3, facilitating them to be scraped into the collection box, thereby improving the cleaning effect on the inner side of the conveyor belt 3, further improving the cleanliness of the inner side of the conveyor belt 3, and thus ensuring the operation of the conveyor.

[0044] As an embodiment of the present invention, a brush 25 is fixedly connected to the bottom of the vibrating plate 24, and the brush 25 contacts the inner side surface of the conveyor belt 3; during operation, by arranging the brush 25 at the bottom of the vibrating plate 24, when the vibrating plate 24 moves up and down, the brush 25 contacts the inner side surface of the conveyor belt 3 tightly and then relaxes. When the brush 25 is in close contact with the conveyor belt 3, impurities on the conveyor belt 3 are further brushed off the conveyor belt 3. When the brush 25 is in loose contact with the conveyor belt 3, the friction between the brush 25 and the conveyor belt 3 is reduced, the running resistance of the conveyor belt 3 is decreased, and it is convenient to shake off the impurities on the brush 25, which is convenient for the dust collection box 7 to collect. When the brush 25 moves up and down on the vibrating plate 24, the vibrating plate 24 is in flexible contact with the conveyor belt 3, reducing the impact of the vibrating plate 24 on the conveyor belt 3, thereby protecting the conveyor belt 3.

[0045] A tensioning device according to the present invention, the tensioning device is arranged on the above belt conveyor, and the tensioning device includes:

[0046] Movable rollers 81, a pair of the movable rollers 81 are provided, and the movable rollers 81 are respectively in contact with the inner surface and the outer surface of the conveyor belt 3;

[0047] Fixed roller 82, the fixed roller 82 is fixedly installed on the frame 1, a traction rope 83 is pulled on the fixed roller 82, and both ends of the traction rope 83 are respectively fixed on the rotating shafts of the movable rollers 81;

[0048] Counterweight 84, pulleys 85 are installed on both sides of the counterweight 84, and the pulleys 85 slide on the traction rope 83;

[0049] During operation, by arranging a pair of movable rollers 81, the conveyor belt 3 bypasses the movable rollers 81 respectively, the traction rope 83 bypasses the fixed roller 82 and the pulleys 85 on the counterweight 84 and is fixed on the rotating shafts of the movable rollers 81, so that the counterweight 84 pulls the movable rollers 81 through the traction rope 83 to tension the conveyor belt 3. By using a pair of movable rollers 81, the conveyor belt 3 has a longer storage capacity, so that it has a larger tensioning range, is convenient to adjust the tensioning force according to the carrying capacity, is not easy to cause the conveyor belt 3 to break due to the change of the carrying capacity, effectively ensures the tensioning degree of the conveyor belt 3, ensures the normal operation of the conveyor, and the stored conveyor belt 3 is placed horizontally, reducing the height of the tensioning device, reducing the space occupation, and being convenient to apply to more installation scenarios.

[0050] The specific working process is as follows:

[0051] During operation, by setting the scraping plate 11, when the conveyor is running, the controller drives the motor, the motor drives the roller 2 to rotate, the roller 2 drives the conveyor belt 3 to run, the material falls onto the conveyor belt 3 and moves from one end to the other end along the conveyor belt 3. During the rotation of the roller 2, the coil spring causes the scraping plate 11 to always be in contact with the surface of the roller 2, thereby removing the impurities on the surface of the roller 2. And because cams 21 are provided at both ends of the roller 2, the paddle 12 on the scraping plate 11 contacts the cam 21, and the rotation of the cam 21 causes the paddle 12 to swing, making the scraping plate 11 vibrate, which is convenient for shaking off the remaining impurities on the scraping plate 11. The impurities are scraped off by the scraping plate 11 and fall into the diversion trough 4, and the impurities flow out along the diversion trough 4, thereby cleaning the roller 2, preventing impurities from entering between the roller 2 and the conveyor belt 3, and protecting the conveyor belt 3; by setting the support plate 5, when placing materials on the conveyor belt 3, the materials will cause a certain impact on the conveyor belt 3. During the impact, it is difficult for the tensioning device of the conveyor to quickly respond for tensioning adjustment, resulting in wear or even breakage. In the present invention, after the materials fall onto the conveyor belt 3, the support plate 5 supports the conveyor belt 3, thereby reducing the impact, reducing wear, and preventing the conveyor belt 3 from breaking due to excessive force. And guide rollers 51 are provided on the support plate 5, and the height of the guide rollers 51 is higher than that of the support plate 5, making the contact between the support plate 5 and the conveyor belt 3 a rolling friction; by setting the support spring 61 at the bottom of the support plate 5, when placing materials on the conveyor belt 3, the gravity of the materials acts on the conveyor belt 3, the force of the conveyor belt 3 in the vertical direction acts on the support plate 5, and then acts on the support spring 61 on the fixing plate 6. The support spring 61 is compressed after being stressed. When the materials decrease, the support spring 61 elastically resets to buffer and shock-absorb the support plate 5. By setting the tension spring 14, when placing materials on the conveyor belt 3, the conveyor belt 3 is stressed and sinks downward. During the sinking, the tension force on the conveyor belt 3 increases, causing the tension spring 14 to be compressed, reducing the center distance between the rollers 2, releasing a certain length of the conveyor belt 3. After the materials are reduced to a certain weight, the tension spring 14 resets, thereby reducing the tension force on the conveyor belt 3, adjusting the tension force on the conveyor belt 3, reducing the impact on the conveyor belt 3, and further protecting the conveyor belt 3. And when the materials increase, the rollers 2 move towards the center, making the contact between the rollers 2 and the scraping plate 11 closer, thereby improving the scraping effect of the scraping plate 11, keeping the surface of the roller 2 clean even when the materials increase, and thus making the conveyor belt 3 not easily break due to impurities entering between the roller 2 and the conveyor belt 3.

[0052] The above front, back, left, right, up, and down are based on the perspective of the observer. The side of the device facing the observer is defined as the front, and the left side of the observer is defined as the left, and so on.

[0053] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the Figure 1 orientation or positional relationships shown, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention.

[0054] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A belt conveyor, comprising a frame (1), a roller (2), a conveyor belt (3), a motor and a controller, characterized in that, It further includes: A scraper (11) rotatably mounted on the frame (1) with a torsion spring installed at the rotation point. The end of the scraper (11) contacts the surface of the roller (2). Cam (21) is fixedly connected to both ends of the roller (2). A paddle (12) is fixedly connected to the scraper (11) on the side close to the cam (21), and the paddle (12) contacts the cam (21); A diversion groove (4) installed on the frame (1) and arranged below the scraper (11); The frame (1) fixedly installs a support plate (5) at the bottom of the conveyor belt (3). A guide roller (51) is rotatably connected to the support plate (5), and the outer edge height of the guide roller (51) is higher than that of the support plate (5); The frame (1) fixedly installs a fixing plate (6) below the support plate (5), and a support spring (61) is fixedly connected between the fixing plate (6) and the support plate (5); The frame (1) slidably installs a sliding frame (13) at both ends of the roller (2). The roller (2) is rotatably mounted on the sliding frame (13), and a tension spring (14) is fixedly connected between the sliding frame (13) and the frame (1); The support plate (5) is slidably connected to the frame (1), and the support plate (5) is in frictional contact with the rotating end of the scraper (11); The frame (1) installs a dust collection box (7) inside the conveyor belt (3), and the bottom of the dust collection box (7) is in close contact with the inner side of the conveyor belt (3); A diversion plate (71) is fixedly connected inside the dust collection box (7). The diversion groove (4) extends to both ends of the dust collection box (7), and waste discharge ports (72) are opened at both ends of the dust collection box (7); A driven rod (22) is slidably installed on the diversion groove (4) on the side close to the cam (21). A return spring (23) is fixedly connected between the driven rod (22) and the diversion groove (4). The return spring (23) is used to press the top of the driven rod (22) against the cam (21), and the bottom end of the driven rod (22) is fixedly connected to a vibrating plate (24); A brush (25) is fixedly connected to the bottom of the vibrating plate (24), and the brush (25) contacts the inner side surface of the conveyor belt (3); By setting the scraper (11), when the conveyor is running, the controller drives the motor, the motor drives the roller (2) to rotate, the roller (2) drives the conveyor belt (3) to run, the material falls onto the conveyor belt (3) and moves from one end to the other end along with the conveyor belt (3). During the rotation of the roller (2), the spiral spring makes the scraper (11) always in contact with the surface of the roller (2), thereby removing the impurities on the surface of the roller (2). And because cams (21) are arranged at both ends of the roller (2), the paddles (12) on the scraper (11) are in contact with the cams (21), and the rotation of the cams (21) causes the paddles (12) to swing, making the scraper (11) vibrate, which is convenient for vibrating off the residual impurities on the scraper (11). After the impurities are scraped off by the scraper (11), they fall into the diversion trough (4), and the impurities flow out along the diversion trough (4), thereby cleaning the roller (2), preventing impurities from entering between the roller (2) and the conveyor belt (3), and protecting the conveyor belt (3).

2. A tensioning device, characterized in that: The tensioning device is arranged on the belt conveyor described in Claim 1, and the tensioning device includes: Movable rollers (81), a pair of the movable rollers (81) are provided, and the movable rollers (81) are respectively in contact with the inner surface and the outer surface of the conveyor belt (3); Fixed rollers (82), the fixed rollers (82) are fixedly installed on the frame (1), a towing rope (83) is towed on the fixed rollers (82), and both ends of the towing rope (83) are respectively fixed on the movable rollers (81); Weights (84), pulleys (85) are installed on both sides of the weights (84), and the pulleys (85) slide on the towing rope (83).

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