Double-tooth roller crusher and method for preventing crushing teeth from being damaged

Abstract

The present invention relates to the technical field of double-toothed roller crushers, and discloses a double-toothed roller crusher and a method for preventing crushing teeth from being damaged, comprising a box body, and also comprising a transmission device, a vibration device, a separation device and a protective device; the inner walls on both sides of the box body are rotatably connected with a rotating plate, the top of the box body is fixedly connected with a support frame, the inner wall of the support frame is slidably connected with a filter plate, and the top of the support frame is fixedly connected with a feed hopper, and in the present invention, the filter plate will block oversized coal to prevent the oversized coal from entering between the two crushing rollers, thereby causing excessive load on the crushing teeth and increasing the risk of damage to the crushing teeth; if the crushing tooth body on the crushing roller is damaged, the rotating plate is opened, and the threaded rod on the damaged crushing tooth body is rotated out, and then the crushing tooth body can be removed and replaced with a new crushing tooth body, thereby achieving rapid replacement of the damaged crushing tooth body.

Description

Technical Field

[0001] The present invention relates to the technical field of double-toothed roller crushers, in particular to a double-toothed roller crusher and a method thereof for preventing crushing teeth from being damaged. Background Art

[0002] Double-tooth roller crusher is a common crushing equipment, usually used for crushing materials such as ores, rocks, coal, etc. with a hardness below medium. The main working principle of this crusher is to squeeze and pull the material through two sets of gears on the roller to achieve the crushing effect.

[0003] Application number CN202021463287.9 ​​discloses a double-toothed roller crusher, comprising a body, a lower fixed plate is provided at the bottom of the body, a fixed foot is provided at the bottom of the lower fixed plate, an upper fixed plate is provided at the top of the body, two flywheels are provided on the front end face of the body, a feed pipe is provided at the middle position of the upper end face of the upper fixed plate, an adjustable sleeve is provided above the feed pipe, a hopper is provided on the top of the sleeve, an adjustable movable sealing plate is provided on one side of the sleeve, a straight plate is provided at the head of the movable sealing plate, a handle is provided on the front end face of the straight plate, and an adjusting rod is provided on the end face of one side of the sleeve above the straight plate. The double-toothed roller crusher described in this utility model belongs to the field of mechanical equipment. By arranging a sleeve and a hopper above the feed pipe, it is convenient for loading and at the same time raising the height to prevent people from accidentally touching it. An adjustable movable sealing plate is arranged in the sleeve, which can effectively control the opening and closing of the feed pipe and facilitate adjustment. However, when this device is crushing coal, large pieces of coal sometimes fall into the crusher, and excessively large pieces of coal can easily cause excessive load on the crushing teeth, increasing the risk of damage to the crushing teeth. Therefore, a double-toothed roller crusher and a method thereof that avoid damage to the crushing teeth are proposed to solve the above-mentioned problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a double-toothed roller crusher and a method thereof for preventing damage to the crushing teeth in view of the above-mentioned deficiencies in the prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a double-toothed roller crusher and method for avoiding damage to crushing teeth, comprising a box body, a transmission device, a vibration device, a separation device and a protection device; the inner walls on both sides of the box body are rotatably connected with a rotating plate, the top of the box body is fixedly connected with a support frame, the inner wall of the support frame is slidably connected with a filter plate, and the top of the support frame is fixedly connected with a feed hopper; the transmission device comprises a motor, a drum, a crushing tooth body, a threaded rod and a transmission gear, the motor is fixedly connected to the rear of the box body, the drum is fixedly connected to the output end of the motor, the crushing tooth body is slidably connected to the inner wall of the drum, the threaded rod is threadedly connected to the inner wall of the drum, and the transmission gear is fixedly connected to the front end of the drum; the vibration device is set At the rear of the support frame, the separation device is arranged on the inner wall of the filter plate, and the protective device is arranged on the inner wall of the feed hopper; the two ends of the roller are in contact with the inner wall of the box body, the rear of the transmission gear is in contact with the front of the box body, and the surface of the threaded rod is in contact with the inner wall of the crushing tooth body. When the coal mine passes through the filter plate before entering the box body through the feed hopper, the filter plate will block the overly large coal mine to prevent the overly large coal mine from entering between the two crushing rollers, thereby causing excessive load on the crushing teeth and increasing the risk of damage to the crushing teeth. If the crushing tooth body on the crushing roller is damaged, open the rotating plate and rotate out the threaded rod on the damaged crushing tooth body. After that, the crushing tooth body can be removed and replaced with a new one, thereby achieving rapid replacement of the damaged crushing tooth body.

[0006] The cam is connected to the filter housing by a spring, and the cam is connected to the filter housing by a spring. When the filter plate needs to be taken out, the rotating rod is rotated on the support rod through the universal joint so that the rotating rod no longer blocks the movement of the filter plate.

[0007] Preferably, the separation device includes a support plate, a swing plate and a magnetic plate, the support plate is fixedly connected to the inner wall of the filter plate, the swing plate is rotatably connected to the inner wall of the swing plate by a torsion spring, and the magnetic plate is fixedly connected to the top of the swing plate; the separation device also includes an inner rod and a stirring rod, the inner rod is fixedly connected to the surface of the feed hopper, and the stirring rod is movably connected to the surface of the inner rod; the surface of the inner rod is provided with a cross-type spiral groove, the inner wall of the stirring rod is provided with a block, and the block is located in the cross-type spiral groove, the rear end of the magnetic plate after movement contacts with the front end of the stirring rod, and a spring is provided between the front end of the inner rod and the inner wall of the stirring rod, so that when the filter plate moves back and forth, it will drive the support plate When the plate moves, the support plate will drive the magnetic plate on the swing plate to move, and the magnetic plate will absorb small pieces of iron in the feed hopper to prevent the iron from entering between the crushing rollers and causing damage to the crushing tooth body. At the same time, when the magnetic plate moves, it will contact the stirring rod and push the stirring rod to move on the inner rod. The surface of the inner rod is provided with a cross spiral groove, and the block on the inner wall of the stirring rod is located in the cross spiral groove. Therefore, when the stirring rod is pushed to displace, it will also rotate under the guidance of the cross spiral groove. The stirring rod will stir the coal in the feed hopper to prevent the coal from piling up and affecting its falling effect. The magnetic plate will also be affected by the reaction force of the stirring rod and push the magnetic plate to rotate, thereby increasing the contact area between the magnetic plate and the coal and improving the attraction effect of iron in the coal.

[0008] Preferably, the protective device includes a protective plate and an elastic plate, the protective plate is fixedly connected to the surface of the feed hopper, and the elastic plate is fixedly connected to the lower surface of the protective plate; the protective device also includes a scraper, a clamping plate and an elastic strip, the scraper is slidably connected to the upper surface of the protective plate, the clamping plate is fixedly connected to the lower surface of the scraper, and the elastic strip is fixedly connected to the surface of the clamping plate, the upper surface of the clamping plate and the lower surface of the protective plate are in contact with each other. When the coal mine enters the feed hopper, the protective plate will guide the coal mine so that the coal mine falls toward both sides of the magnetic plate to prevent the coal mine from hitting the surface of the magnetic plate, thereby causing damage to the magnetic plate. At the same time, when the magnetic plate moves, it will contact the elastic plate and push the elastic plate to cause the protective plate to vibrate. The vibration will cause the top coal mine to slide to both sides. At the same time, the movement of the magnetic plate will also push the elastic strip to deform. When the elastic strip is expanded, it will push the two clamping plates to move in opposite directions. The clamping plate will drive the scraper to move on the protective plate and scrape off the top coal mine, thereby promoting the downward movement and dropping of the coal mine.

[0009] A method for using a double-toothed roller crusher to avoid damage to crushing teeth comprises the following steps:

[0010] Step 1: When the coal enters the box through the feed hopper, it will pass through the filter plate. The filter plate will block the oversized coal to prevent it from entering between the two crushing rollers.

[0011] Step 2: When the crushing tooth body on the crushing roller is damaged, open the rotating plate and rotate out the threaded rod on the damaged crushing tooth body. Then the crushing tooth body can be removed and replaced with a new one.

[0012] Step 3: Every once in a while, pull out the filter plate and remove the large pieces of coal accumulated on the surface to prevent too much coal from being filtered out and causing blockage of the filter plate.

[0013] The present invention adopts the above technical solution, which can bring the following beneficial effects:

[0014] 1. The double-toothed roller crusher and method for preventing damage to the crushing teeth thereof cooperate with the operation of the box, rotating plate, supporting frame, filter plate, feed hopper, motor, roller, crushing tooth body, threaded rod, and transmission gear. When the coal enters the box through the feed hopper, it will pass through the filter plate. The filter plate will block the oversized coal to prevent it from entering between the two crushing rollers, thereby causing excessive load on the crushing teeth and increasing the risk of damage to the crushing teeth. If the crushing tooth body on the crushing roller is damaged, the rotating plate is opened and the threaded rod on the damaged crushing tooth body is rotated out. After that, the crushing tooth body can be removed and replaced with a new one, thereby achieving rapid replacement of the damaged crushing tooth body.

[0015] 2. The double-toothed roller crusher and method for avoiding damage to the crushing teeth, through the coordinated operation of the fixed plate, baffle, magnet, support rod, rotating rod, roller, and arc block, pulls out the filter plate at regular intervals and removes the large pieces of coal accumulated on the surface to prevent excessive coal from being filtered out and causing blockage of the filter plate. At the same time, the forward movement of the filter plate will drive the baffle forward through the magnet, so that the baffle enters the support frame and blocks the coal on the feed hopper to prevent all the coal on the feed hopper from falling into the box when the filter plate is pulled out.

[0016] 3. The double-toothed roller crusher and method for preventing damage to the crushing teeth thereof cooperate with the support plate, the swing plate, the magnetic plate, the inner rod, and the stirring rod. When the filter plate moves back and forth, it drives the support plate to move, and the support plate drives the magnetic plate on the swing plate to move. The magnetic plate absorbs small pieces of iron in the feed hopper to prevent the iron from entering between the crushing rollers and causing damage to the crushing teeth.

[0017] 4. The double-toothed roller crusher and method for avoiding damage to the crushing teeth, through the coordinated operation of the protective plate, elastic plate, scraper, clamping plate, and elastic strip, when the coal enters the feed hopper, the protective plate will guide the coal to make the coal fall toward the two sides of the magnetic plate, preventing the coal from hitting the surface of the magnetic plate and causing damage to the magnetic plate. At the same time, when the magnetic plate moves, it will contact the elastic plate and push the elastic plate to make the protective plate vibrate, and the vibration will cause the coal on the top to slide to both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the motor structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the transmission gear structure of the present invention;

[0021] Figure 4 This is a half-section diagram of the crushing tooth body structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the filter plate structure of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the rotating rod of the present invention;

[0024] Figure 7 This is a schematic diagram of the support rod structure of the present invention;

[0025] Figure 8 This is a schematic diagram of the magnetic plate structure of the present invention;

[0026] Figure 9 This is a schematic diagram of the inner rod structure of the present invention;

[0027] Figure 10 This is a half-section view of the protective plate structure of the present invention.

[0028] In the figure: 1. Box body; 2. Rotating plate; 3. Support frame; 4. Filter plate; 5. Feed hopper; 6. Transmission device; 61. Motor; 62. Drum; 63. Crushing tooth body; 64. Threaded rod; 65. Transmission gear; 7. Vibration device; 71. Fixed plate; 72. Baffle; 73. Magnet; 731. Support rod; 732. Rotating rod; 733. Roller; 734. Arc block; 8. Separation device; 81. Support plate; 82. Swinging plate; 83. Magnetic plate; 831. Inner rod; 832. Stirring rod; 9. Protective device; 91. Protective plate; 92. Elastic plate; 921. Scraper; 922. Card plate; 923. Elastic strip. DETAILED DESCRIPTION

[0029] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] See also Figure 1-7, one embodiment of the present invention is: a double-toothed roller crusher and method for preventing damage to crushing teeth, including a box body 1, a transmission device 6, a vibration device 7, a separation device 8 and a protective device 9; the inner walls on both sides of the box body 1 are rotatably connected to a rotating plate 2, the top of the box body 1 is fixedly connected to a support frame 3, the inner wall of the support frame 3 is slidably connected to a filter plate 4, and the top of the support frame 3 is fixedly connected to a feed hopper 5. When the coal passes through the feed hopper 5 and enters the box body 1, it will pass through the filter plate 4. The filter plate 4 will block the oversized coal to prevent the oversized coal from entering between the two crushing rollers, thereby causing excessive load on the crushing teeth and increasing the risk of damage to the crushing teeth; the transmission device 6 includes a motor 61, a roller 62, a crushing tooth body 63, a threaded rod 64 and a transmission gear 65. The motor 61 is fixedly connected to the rear of the box body 1, and the roller 62 is fixedly connected to Connected to the output end of the motor 61, the crushing tooth body 63 is slidably connected to the inner wall of the drum 62, the threaded rod 64 is threadedly connected to the inner wall of the drum 62, and the transmission gear 65 is fixedly connected to the front end of the drum 62; the vibration device 7 is arranged at the rear of the support frame 3, the separation device 8 is arranged on the inner wall of the filter plate 4, and the protective device 9 is arranged on the inner wall of the feed hopper 5; the two ends of the drum 62 are in contact with the inner wall of the box body 1, the rear part of the transmission gear 65 is in contact with the front part of the box body 1, and the surface of the threaded rod 64 is in contact with the inner wall of the crushing tooth body 63. If the crushing tooth body 63 on the crushing roller is damaged, open the rotating plate 2 and rotate out the threaded rod 64 on the damaged crushing tooth body 63. After that, the crushing tooth body 63 can be removed and replaced with a new crushing tooth body 63, so that the damaged crushing tooth body 63 can be quickly replaced.

[0031] The vibrating device 7 includes a fixed plate 71, a baffle 72 and a magnet 73. The fixed plate 71 is fixedly connected to the rear of the support frame 3. The baffle 72 is slidably connected to the bottom of the fixed plate 71 by a spring. The magnet 73 is fixedly connected to the inner wall of the rear of the filter plate 4 and the inner wall of the front of the baffle 72. Every once in a while, the filter plate 4 is pulled out and the large pieces of coal accumulated on the surface are removed to prevent the filtered coal from being too much and causing the filter plate 4 to be blocked. At the same time, the forward movement of the filter plate 4 will drive the baffle 72 forward through the magnet 73, so that The baffle 72 enters the support frame 3 and blocks the coal on the feed hopper 5 to prevent the coal on the feed hopper 5 from falling into the box body 1 when the filter plate 4 is pulled out; the vibration device 7 also includes a support rod 731, a rotating rod 732, a roller 733 and an arc block 734. The support rod 731 is fixedly connected to the front of the box body 1, the rotating rod 732 is installed in the front of the support rod 731 through a universal joint, the roller 733 is rotatably connected to the inner wall of the rotating rod 732, and the arc block 734 is fixedly connected to the front of the transmission gear 65. The surface of the roller 733 contacts the front of the transmission gear 65, the magnet 73 in the filter plate 4 and the magnet 73 in the baffle 72 are magnetically attracted, the front of the baffle 72 contacts the rear of the filter plate 4, the surface of the rotating rod 732 contacts the front of the filter plate 4, the motor 61 drives the roller 62 to rotate, the roller 62 drives the transmission gear 65 to rotate, the transmission gear 65 drives the arc block 734 to rotate, the arc block 734 pushes the rotating rod 732 to rotate on the support rod 731 through the arc surface, and the rotation The rotating rod 732 will rotate and push the filter plate 4 to move backward, and the filter plate 4 will move backward and push the baffle 72 to move backward. The backward movement of the baffle 72 will compress the spring. When the arc block 734 passes over the rotating rod 732, the spring will drive the baffle 72 and the filter plate 4 to reset. At this time, the filter plate 4 will move back and forth, thereby improving the screening efficiency of the coal mine on the top of the filter plate 4. At the same time, when the filter plate 4 needs to be taken out, the rotating rod 732 is rotated on the support rod 731 through the universal joint so that the rotating rod 732 no longer blocks the movement of the filter plate 4.

[0032] Working principle: when the coal passes through the feed hopper 5 and enters the box body 1, it will pass through the filter plate 4. The filter plate 4 will block the oversized coal to prevent the oversized coal from entering between the two crushing rollers, thereby causing excessive load on the crushing teeth and increasing the risk of damage to the crushing teeth. If the crushing tooth body 63 on the crushing roller is damaged, open the rotating plate 2 and rotate the threaded rod 64 on the damaged crushing tooth body 63 out. After that, the crushing tooth body 63 can be removed and replaced with a new crushing tooth body 63, so that the damaged crushing tooth body 63 can be quickly replaced.

[0033] At regular intervals, the filter plate 4 is pulled out and the large pieces of coal accumulated on the surface are removed to prevent the excessive amount of filtered coal from clogging the filter plate 4. At the same time, the forward movement of the filter plate 4 will drive the baffle 72 forward through the magnet 73, so that the baffle 72 enters the support frame 3 and blocks the coal on the feed hopper 5 to prevent the coal on the feed hopper 5 from falling into the box body 1 when the filter plate 4 is pulled out. At the same time, the motor 61 will drive the roller 62 to rotate, the roller 62 will drive the transmission gear 65 to rotate, the transmission gear 65 will drive the arc block 734 to rotate, and the arc block 734 will pass through the arc The surface pushes the rotating rod 732 to rotate on the support rod 731, and the rotating rod 732 will rotate and push the filter plate 4 to move backward. The filter plate 4 will move backward and push the baffle 72 to move backward. The backward movement of the baffle 72 will compress the spring. When the arc block 734 passes over the rotating rod 732, the spring will drive the baffle 72 and the filter plate 4 to reset. At this time, the filter plate 4 will move back and forth, thereby improving the screening efficiency of the coal mine on the top of the filter plate 4. At the same time, when the filter plate 4 needs to be taken out, the rotating rod 732 is rotated on the support rod 731 through the universal joint so that the rotating rod 732 no longer blocks the movement of the filter plate 4.

[0034] See also Figure 8-10 , on the basis of the above embodiment, in another embodiment of the present invention, the separating device 8 includes a supporting plate 81, a swinging plate 82 and a magnetic plate 83, the supporting plate 81 is fixedly connected to the inner wall of the filter plate 4, the swinging plate 82 is rotatably connected to the inner wall of the swinging plate 82 by a torsion spring, and the magnetic plate 83 is fixedly connected to the top of the swinging plate 82. When the filter plate 4 moves back and forth, it will drive the supporting plate 81 to move, and the supporting plate 81 will drive the magnetic plate 83 on the swinging plate 82 to move, and the magnetic plate 83 will adsorb small pieces of iron in the feed hopper 5 to prevent the iron from entering between the crushing rollers and causing damage to the crushing tooth body 63; the separating device 8 also includes an inner rod 831 and a stirring rod 832, the inner rod 831 is fixedly connected to the surface of the feed hopper 5, and the stirring rod 832 is movably connected to the surface of the inner rod 831; the surface of the inner rod 831 is provided with a cross spiral groove, and the stirring rod 83 2 is provided with a blocking block, and the blocking block is located in the cross-type spiral groove. After the magnetic plate 83 moves, the rear part contacts the front end of the stirring rod 832. A spring is provided between the front end of the inner rod 831 and the inner wall of the stirring rod 832. When the magnetic plate 83 moves, it contacts the stirring rod 832 and pushes the stirring rod 832 to move on the inner rod 831. The surface of the inner rod 831 is provided with a cross-type spiral groove, and the blocking block on the inner wall of the stirring rod 832 is located in the cross-type spiral groove. Therefore, when the stirring rod 832 is pushed to move, it will also rotate under the guidance of the cross-type spiral groove. The stirring rod 832 will stir the coal in the feed hopper 5 to prevent the coal from piling up and affecting its falling effect. The magnetic plate 83 will also be subjected to the reaction force of the stirring rod 832 and then push the magnetic plate 83 to rotate, thereby increasing the contact area between the magnetic plate 83 and the coal, and improving the attraction effect of iron in the coal.

[0035] The protective device 9 includes a protective plate 91 and an elastic plate 92. The protective plate 91 is fixedly connected to the surface of the feed hopper 5, and the elastic plate 92 is fixedly connected to the lower surface of the protective plate 91. When the coal enters the feed hopper 5, the protective plate 91 will guide the coal so that the coal falls toward both sides of the magnetic plate 83 to prevent the coal from hitting the surface of the magnetic plate 83, thereby causing damage to the magnetic plate 83; the protective device 9 also includes a scraper 921, a card plate 922 and an elastic strip 923. The scraper 921 is slidably connected to the upper surface of the protective plate 91, and the card plate 922 is fixedly connected to the lower surface of the scraper 921. The elastic strip 923 is fixedly connected to the surface of the card plate 922. The upper surface of the card plate 922 contacts the lower surface of the protective plate 91. When the magnetic plate 83 moves, it will contact the elastic plate 92 and push the elastic plate 92 to make the protective plate 91 vibrate. The vibration will cause the top coal to slide to both sides. At the same time, the movement of the magnetic plate 83 will also push the elastic strip 923 to deform. When the elastic strip 923 is deformed and expanded, it will push the two card plates 922 to move in the opposite direction. The card plate 922 will drive the scraper 921 to move on the protective plate 91 and scrape off the top of the coal, thereby promoting the downward movement of the coal.

[0036] Working principle: when the filter plate 4 moves back and forth, it will drive the support plate 81 to move, and the support plate 81 will drive the magnetic plate 83 on the swing plate 82 to move. The magnetic plate 83 will absorb small pieces of iron in the feed hopper 5 to prevent the iron from entering between the crushing rollers and causing damage to the crushing tooth body 63. At the same time, when the magnetic plate 83 moves, it will contact the stirring rod 832 and push the stirring rod 832 to move on the inner rod 831. The surface of the inner rod 831 is provided with a cross spiral groove, and the block on the inner wall of the stirring rod 832 is located in the cross spiral groove. Therefore, when the stirring rod 832 is pushed to move, it will also rotate under the guidance of the cross spiral groove. The stirring rod 832 will stir the coal in the feed hopper 5 to prevent the coal from accumulating and affecting its falling effect. The magnetic plate 83 will also be subjected to the reaction force of the stirring rod 832 and then push the magnetic plate 83 to rotate, thereby increasing the contact area between the magnetic plate 83 and the coal, and improving the attraction effect of iron in the coal.

[0037] When the coal enters the feed hopper 5, the protective plate 91 will guide the coal so that it falls toward the two sides of the magnetic plate 83 to prevent the coal from hitting the surface of the magnetic plate 83, thereby causing damage to the magnetic plate 83. At the same time, when the magnetic plate 83 moves, it will contact the elastic plate 92 and push the elastic plate 92 to make the protective plate 91 vibrate. The vibration will cause the top coal to slide to both sides. At the same time, the movement of the magnetic plate 83 will also push the elastic strip 923 to deform. When the elastic strip 923 deforms and expands, it will push the two clamping plates 922 to move in the opposite direction. The clamping plate 922 will drive the scraper 921 to move on the protective plate 91 and scrape off the top coal, thereby promoting the downward movement and dropping of the coal.

[0038] The present invention provides a double-toothed roller crusher and method for preventing damage to the crushing teeth. While there are numerous methods and approaches for implementing this technical solution, the above-described preferred embodiments of the present invention are merely preferred. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also within the scope of protection of the present invention. Components not specified in this embodiment may be implemented using existing technologies.

Claims

1. A double-toothed roller crusher for preventing damage to crushing teeth, comprising a housing (1), characterized in that: It also includes a transmission device (6), a vibration device (7), a separation device (8) and a protection device (9); The inner walls of both sides of the box body (1) are rotatably connected to rotating plates (2), the top of the box body (1) is fixedly connected to a support frame (3), the inner wall of the support frame (3) is slidably connected to a filter plate (4), and the top of the support frame (3) is fixedly connected to a feed hopper (5); The transmission device (6) includes a motor (61), a roller (62), a crushing tooth body (63), a threaded rod (64) and a transmission gear (65), wherein the motor (61) is fixedly connected to the rear portion of the housing (1), the roller (62) is fixedly connected to the output end of the motor (61), the crushing tooth body (63) is slidably connected to the inner wall of the roller (62), the threaded rod (64) is threadedly connected to the inner wall of the roller (62), and the transmission gear (65) is fixedly connected to the front end of the roller (62); The vibration device (7) is arranged at the rear of the support frame (3), the separation device (8) is arranged on the inner wall of the filter plate (4), and the protection device (9) is arranged on the inner wall of the feed hopper (5); The vibration device (7) includes a fixed plate (71), a baffle (72) and a magnet (73), wherein the fixed plate (71) is fixedly connected to the rear of the support frame (3), the baffle (72) is slidably connected to the bottom of the fixed plate (71) via a spring, and the magnet (73) is fixedly connected to the inner wall of the rear of the filter plate (4) and the inner wall of the front of the baffle (72); The vibration device (7) further comprises a support rod (731), a rotating rod (732), a roller (733) and an arc block (734), wherein the support rod (731) is fixedly connected to the front of the box (1), the rotating rod (732) is mounted on the front of the support rod (731) via a universal joint, the roller (733) is rotatably connected to the inner wall of the rotating rod (732), and the arc block (734) is fixedly connected to the front of the transmission gear (65); The surface of the roller (733) contacts the front of the transmission gear (65), the magnet (73) in the filter plate (4) and the magnet (73) in the baffle (72) are magnetically attracted to each other, the front of the baffle (72) contacts the rear of the filter plate (4), and the surface of the rotating rod (732) contacts the front of the filter plate (4); The separation device (8) comprises a support plate (81), a swing plate (82) and a magnetic plate (83); the support plate (81) is fixedly connected to the inner wall of the filter plate (4); the swing plate (82) is rotatably connected to the inner wall of the swing plate (82) via a torsion spring; and the magnetic plate (83) is fixedly connected to the top of the swing plate (82).

2. A double-toothed roller crusher for preventing crushing teeth from being damaged according to claim 1, characterized in that: Both ends of the roller (62) are in contact with the inner wall of the box (1), the rear of the transmission gear (65) is in contact with the front of the box (1), and the surface of the threaded rod (64) is in contact with the inner wall of the crushing tooth body (63).

3. A double-toothed roller crusher for preventing crushing teeth from being damaged according to claim 2, characterized in that: The separation device (8) further comprises an inner rod (831) and a stirring rod (832), wherein the inner rod (831) is fixedly connected to the surface of the feed hopper (5), and the stirring rod (832) is movably connected to the surface of the inner rod (831).

4. A double-toothed roller crusher for preventing crushing teeth from being damaged according to claim 3, characterized in that: A cross-shaped spiral groove is provided on the surface of the inner rod (831), a block is provided on the inner wall of the stirring rod (832), and the block is located in the cross-shaped spiral groove. The rear portion of the magnetic plate (83) contacts the front end of the stirring rod (832) after movement, and a spring is provided between the front end of the inner rod (831) and the inner wall of the stirring rod (832).

5. A double-toothed roller crusher for preventing crushing teeth from being damaged according to claim 4, characterized in that: The protective device (9) comprises a protective plate (91) and an elastic plate (92), wherein the protective plate (91) is fixedly connected to the surface of the feed hopper (5), and the elastic plate (92) is fixedly connected to the lower surface of the protective plate (91); The protective device (9) further comprises a scraper (921), a clamping plate (922) and an elastic strip (923); the scraper (921) is slidably connected to the upper surface of the protective plate (91); the clamping plate (922) is fixedly connected to the lower surface of the scraper (921); the elastic strip (923) is fixedly connected to the surface of the clamping plate (922); and the upper surface of the clamping plate (922) and the lower surface of the protective plate (91) are in contact with each other.

6. The method for using a double-toothed roller crusher to avoid damage to crushing teeth according to claim 5, characterized in that: The following steps are involved: Step 1: When the coal enters the box (1) through the feed hopper (5), it will pass through the filter plate (4). The filter plate (4) will block the oversized coal to prevent it from entering between the two crushing rollers; Step 2: When the crushing tooth body (63) on the crushing roller is damaged, the rotating plate (2) is opened, and the threaded rod (64) on the damaged crushing tooth body (63) is rotated out, and then the crushing tooth body (63) is removed and replaced with a new crushing tooth body (63); Step 3: At regular intervals, the filter plate (4) is pulled out and the large pieces of coal accumulated on the surface are removed to prevent excessive coal from being filtered out and causing blockage of the filter plate (4).

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