Double-roller device capable of adapting to crushing of large-granularity mineral aggregate

Abstract

The invention discloses a double-roller device capable of adapting to crushing of large-granularity mineral aggregates, and belongs to the technical field of mineral aggregate sample preparation equipment. The driving roller and the driven roller are erected between a left side plate and a right side plate of a rack in parallel, and a feeding space with a V-shaped section is formed between the driving roller and the driven roller; the crushing device is characterized in that a feeding auxiliary crushing device is arranged above the driven roller and comprises an extrusion plate and an auxiliary crushing power mechanism, the extrusion plate can do reciprocating motion towards the lower portion of the feeding space on the outer side of the driven roller in the reverse direction, and the auxiliary crushing power mechanism drives the extrusion plate to do reciprocating motion. According to the feeding auxiliary crushing device, the technical problem that the crushing efficiency is low due to the fact that large-granularity materials cannot enter a feeding space and are prone to blockage is solved.

Description

Technical Field

[0001] The present invention relates to a pair of rollers device adaptable to the crushing of large-grained ore materials, belonging to the technical field of ore sample preparation equipment. Background Art

[0002] In the field of coal and other ore sample preparation, the pair-roller crusher is widely used in the medium-fine grain crushing process of medium-low hardness ore materials such as coal due to its simple structure, good sealing performance, small overall floor area of the equipment, easy maintenance, and uniform discharge particle size.

[0003] However, during the sample preparation process of medium-low hardness ore materials such as coal, the cross-contamination of samples is a key control factor. Therefore, when using a pair-roller crusher to crush ore materials, the outer surfaces of the driving and driven rollers need to have a certain smoothness, without sticking to the ore materials, and being easy to scrape and sweep. This requirement is exactly contrary to the principle of using the friction between the surface of the pair-roller drum and the material to be crushed for roller pressing and crushing. That is, on the one hand, a smooth surface is expected during roller pressing to reduce material adhesion, and on the other hand, a rough surface is expected to increase the friction force. Therefore, in the actual use process, there is often a phenomenon that medium-fine grain (6 - 50 mm) ore materials cannot be crushed by pair-rolling due to insufficient friction force at the "V"-shaped feeding port between the pair-roller drums. When the ore materials are pair-rolled and crushed, the discharge particle size is usually below 3 mm. Therefore, the gap between the two rollers needs to be adjusted to less than 3 mm. When the incoming material contains ore materials with a particle size of 30 - 50 mm (belonging to the larger particle size in medium-fine grains), due to the small friction force between the massive ore materials and the roller surface (the roller surface is not allowed to have knurling or other forms of rough treatment to prevent sticking), the large-grained ore materials only "dance" between the two rollers and cannot enter the roller gap (less than 3 mm). This phenomenon not only affects the pair-rolling crushing efficiency but also easily causes material blockage, that is, the larger ore materials in the medium-fine grain (6 - 50 mm) are blocked in the "V"-shaped feeding port, resulting in one of the biggest drawbacks commonly existing in the roller crusher: low crushing efficiency and easy material blockage.

[0004] In addition, during isokinetic pair-rolling crushing, it is easy to roll the wet material with a relatively high moisture content into a "cake" shape, resulting in the sieving rate not meeting the national standard requirements.

[0005] Therefore, a pair of rollers device with a more perfect and reasonable structure, adaptable to the crushing of large-grained ore materials, has become the goal pursued by those skilled in the art. Summary of the Invention

[0006] The purpose of the present invention is to solve the problem that when the existing pair-roller crusher is used for large-grained crushing of medium-fine grain ore materials ((6 - 50 mm)), the large-grained ore materials are easily blocked in the "V"-shaped feeding port due to insufficient friction force, resulting in low crushing efficiency.

[0007] To achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows: A pair of roll devices adaptable to the crushing of large-grained ore materials, which includes a driving roll and a driven roll arranged in parallel between the left and right side plates of a frame. An inlet space with a "V"-shaped cross-section is formed between the driving roll and the driven roll. It is characterized in that: an inlet auxiliary crushing device is provided above the driven roll, and the inlet auxiliary crushing device includes a pressing plate that can reciprocate towards the lower part of the inlet space and in the reverse direction outside the driven roll, and an auxiliary crushing power mechanism for driving the reciprocating movement of the pressing plate.

[0008] In the pair of roll devices adaptable to the crushing of large-grained ore materials of the present invention, as a preferred solution, the pressing plate is in the shape of an arc plate; the inlet auxiliary crushing device further includes: arc-shaped guide rails provided on the inner side surfaces of the left and right side plates of the frame for providing the movement track of the pressing plate. The radius of the arc-shaped guide rail is greater than the radius of the driven roll, so that the pressing plate does not interfere with the driven roll;

[0009] The auxiliary crushing power mechanism includes: a reduction motor installed on the cross beam of the frame through a motor mounting bracket. A crank disk is provided on the output shaft of the reduction motor. One end of the crank disk is connected to one end of a connecting rod through a hinge pin; the other end of the connecting rod is hinged to the rear end of the pressing plate, driving the pressing plate to reciprocate towards the lower part of the inlet space and in the reverse direction.

[0010] In the pair of roll devices adaptable to the crushing of large-grained ore materials of the present invention, as a preferred solution, the connecting rod includes two sections arranged front and back: a first section and a tail section. The tail section is hinged to the crank disk, and the first section is hinged to the rear end of the pressing plate. A buffer spring for buffering the pressing force of the pressing plate is connected between the tail section and the first section.

[0011] In the pair of roll devices adaptable to the crushing of large-grained ore materials of the present invention, as a preferred solution, two connecting ears are provided at the rear end of the pressing plate. Two free ends of a U-shaped hinge pin connecting block are hinged to the hinge pin connecting block through hinge pins. The other end of the connecting rod is connected to the cross plate of the hinge pin connecting block through a threaded fixing member.

[0012] In the pair of roll devices adaptable to the crushing of large-grained ore materials of the present invention, as a preferred solution, an inner baffle is respectively provided between the left and right side plates of the frame and the arc-shaped guide rail. The arc-shaped slide rail is welded and fixed to the inner side of the inner baffle; two mounting seat blocks are connected to the outer side of the inner baffle, and the mounting seat blocks can be locked to the two side plates on the frame through screws.

[0013] The pair-roller device for crushing large-sized ore materials according to the present invention, as a preferred embodiment, includes: a main crushing power mechanism installed on a frame for driving the rotation of a driving roller and a driven roller. The main crushing power mechanism includes a main power motor disposed at the bottom of the frame, and the main power motor transmits power to the driving roller through a belt transmission mechanism; the other end of the driving roller transmits power to the driven roller through a differential device.

[0014] The pair-roller device for crushing large-sized ore materials according to the present invention, as a preferred embodiment, wherein the driving roller includes a driving roller barrel and a driving roller barrel shaft passing through its central position. A set of pedestal bearings are provided at the left and right ends of the driving roller barrel shaft, and the pedestal bearings are installed and fixed on the left and right side plates of the frame; a shoulder I is provided at the left end of the driving roller barrel shaft, and a locking nut I is provided at the right end for axially fixing the driving roller barrel and adjusting the axial clearance of the driving roller barrel.

[0015] The driven roller includes a driven roller barrel and a driven roller barrel shaft passing through its central position. A set of square pedestal bearings are provided at the left and right ends of the driven roller barrel shaft, and the square pedestal bearings are installed in the horizontally elongated slot-shaped card slots on the left and right side plates of the frame. A shoulder II is provided at the left end of the driven roller barrel shaft, and a locking nut II is provided at the right end for axially fixing the driven roller barrel and adjusting the axial clearance of the driven roller barrel.

[0016] The pair-roller device for crushing large-sized ore materials according to the present invention, as a preferred embodiment, wherein the belt transmission mechanism includes a small belt pulley disposed at the output shaft end of the main power motor, a large belt pulley disposed at the end of the driving roller barrel shaft, and a belt connecting the small belt pulley and the large belt pulley.

[0017] The differential device includes: a sprocket I installed at the other end of the driving roller barrel shaft of the driving roller;

[0018] a sprocket II installed at the other end of the driven roller barrel shaft of the driven roller; the sprocket I, the sprocket II, and a tensioning sprocket III are connected in series by a chain. Among them, the sprocket II is placed outside the chain, and the diameter of the sprocket II is larger than that of the sprocket I;

[0019] the tensioning sprocket III is fixed on a tensioning wheel mounting seat through a pin shaft. The tensioning wheel mounting seat includes a base plate for connecting with the side plate of the frame. The hole on the base plate for connecting with the side plate of the frame is an oblong hole; a vertical plate perpendicular to the base plate, and one end of a tensioning wheel support rod is fixedly connected to the vertical plate, and the other end is rotatably connected to the pin shaft for providing auxiliary support for the tensioning sprocket III.

[0020] One end of a tensioning screw for adjusting the distance between the tensioning sprocket III and the sprocket I is connected to the vertical plate of the tensioning wheel mounting seat, and the other end of the tensioning screw is connected to a fixed block fixed on the side plate of the frame. The vertical plate and the tensioning wheel mounting seat are driven to move forward and backward by adjusting the forward and backward positions of the tensioning screw.

[0021] The roller device that can adapt to the crushing of large-size mineral materials described in the present invention is a preferred embodiment, in which the main power motor is installed on the frame through an adjusting seat plate assembly, and the adjusting seat plate assembly includes a seat plate for installing the main power motor, one side of the seat plate is welded with a mounting support rod 1, and the other side is provided with two "U"-shaped bayonet holes, in which an adjusting screw is passed, and the other end of the adjusting screw can be rotatably mounted on a mounting support rod 2 through a sliding sleeve; the two ends of the mounting support rods 1 and 2 are fixed to the bottom of the left and right side plates of the frame by fasteners.

[0022] The roller device for crushing large-size mineral materials of the present invention is a preferred embodiment, wherein it also includes a set of master and slave roller gap adjustment devices arranged in parallel in the two side plate slots of the frame, using spring force as a holding force; the master and slave roller gap adjustment devices are of left-right symmetrical structure, with one set arranged on each side;

[0023] The main and driven roller gap adjustment device comprises:

[0024] A convex connecting block is used to connect the square seat bearing of the driven roller, and the other end of the convex connecting block is connected to an adjusting rod. The adjusting rod is provided with a set of preload springs with one end against the connecting block and the other end stopped by an adjusting nut. The other end of the adjusting rod is locked on the fixed plate by a nut; the fixed plate is arranged in the slots of the left and right side plates of the frame in parallel with the square seat bearing of the driven roller and fixed with screws.

[0025] The double roller device that can adapt to the crushing of large-size mineral materials described in the present invention is a preferred embodiment, wherein it also includes a material receiving device mounted directly below the active roller and the driven roller. The material receiving device can be one of: a material receiving conveyor, a reducer receiving hopper or a material receiving container.

[0026] The pair of rollers device adaptable to the crushing of large-grained ore materials in the present invention is provided with a feeding auxiliary crushing device above the driven roller. The feeding auxiliary crushing device has a pressing plate and an auxiliary crushing power mechanism. The pressing plate can perform a pressing movement towards the lower part of the feeding space outside the driven roller. At the same time, driven by the auxiliary crushing power mechanism, the pressing plate can perform pressing and reciprocating reverse movements. Thus, through the action of the pressing plate, the large ore materials in the "V"-shaped feeding space can be extruded and impacted, improving the friction force between them and the driving roller. Furthermore, the large ore materials can be crushed into ore materials with appropriate particle sizes that can fall into the "V"-shaped feeding space, effectively avoiding the occurrence of material blocking phenomenon.

[0027] In particular, in the present invention, the pressing plate is further designed as an arc-shaped plate, and an arc-shaped guide rail is arranged on the inner side surface of the frame side plate to provide the movement track of the pressing plate. The crank-link mechanism is used for power transmission, and it performs a reciprocating arc segment rotation movement along an arc-shaped guide rail slightly larger than the radius of the driven roller. When the pressing plate is more convenient to move and press, when its front end contacts large particle ore blocks, the pressing plate and the cylindrical wall of the driving roller form a pressing cavity, generating a pressing effect on the large particle ore blocks clamped in the middle, thereby extruding and crushing the large particle ore blocks, playing an auxiliary crushing function before the pair of rollers crushing. At the same time, for the secondary particle ore materials that are not extruded and crushed, due to the increase in the pressure between them and the roller wall, the friction force between the particle ore blocks and the roller wall increases, so it is easier to be "rolled into" the gap between the two roller cylinders, forming an effective pair of rollers crushing.

[0028] The test data of the present invention shows that taking coal crushing as an example, for a pair of rollers with a common size of Φ300*300, it can only crush coal with a feed particle size less than or equal to 13 mm. When the coal particles are larger than 13 mm, there will basically be a lot of coal blocks remaining in the feed inlet, and the situation of "stuffy machine" of the pair of rollers equipment occurs from time to time. However, when the feeding auxiliary crushing device described in the present invention is added, coal blocks with a particle size below 80 mm can basically achieve efficient pair of rollers crushing, without residue and without "stuffy machine".

[0029] The connecting rod for driving the movement of the pressing plate in the present invention is divided into two sections, which are connected into one body by a buffer spring in the middle. Thus, it can effectively avoid the rigid impact of the pressing plate, playing the role of a buffer tank, ensuring that the pressing force of the pressing plate is a flexible force, thereby avoiding the phenomenon that when encountering too hard materials, it will get stuck, affecting the crushing effect and reducing the service life of the equipment.

[0030] In summary, the present invention solves the technical problems that large-grained materials cannot enter, are easy to block materials, and thus cause low crushing efficiency by setting a feeding auxiliary crushing device on the roller. In addition, the present invention realizes differential pair of rollers through a sprocket differential device, thus solving the technical problem that wet materials with a relatively high moisture content are rolled into a "cake" shape. Brief Description of the Drawings

[0031] Figure 1 is a perspective view of the pair of rolls device adaptable to crushing large-grained ore materials according to the present invention;

[0032] Figure 2 、 3 are a perspective view and a longitudinal sectional view of the feeding auxiliary crushing device of the pair of rolls device adaptable to crushing large-grained ore materials according to the present invention;

[0033] Figure 4 is a longitudinal sectional view of the driving roll of the pair of rolls device adaptable to crushing large-grained ore materials according to the present invention;

[0034] Figure 5 is a longitudinal sectional view of the driven roll of the pair of rolls device adaptable to crushing large-grained ore materials according to the present invention;

[0035] Figure 6 is a perspective view of the main crushing power mechanism of the pair of rolls device adaptable to crushing large-grained ore materials according to the present invention;

[0036] Figure 7 、 8 are a perspective view and a front view of the differential device of the pair of rolls device adaptable to crushing large-grained ore materials according to the present invention;

[0037] Figure 9 is a perspective view of the main and driven roll gap adjusting device of the pair of rolls device adaptable to crushing large-grained ore materials according to the present invention;

[0038] Figure 10 、 11 are working principle diagrams of the feeding auxiliary crushing device of the pair of rolls device adaptable to crushing large-grained ore materials in two states of being opened and closed.

[0039] Description of reference numerals: Feeding auxiliary crushing device 1, auxiliary crushing power mechanism 10, motor mounting bracket 11, reduction motor 12, crank disk 13, buffer spring 14, connecting rod 15, hinge pin connecting block 16, inner baffle 17, mounting seat block 18, extrusion plate 19, connecting ear 191, arc guide rail 110; frame 2, side plate 21, cross tension beam 22, card slot 23; driving roller 3, driving roller cylinder 31, driving roller cylinder shaft 32, pedestal bearing 33, shoulder one 321, stop nut one 34; driven roller 4, driven roller cylinder 41, driven roller cylinder shaft 42, square pedestal bearing 43, shoulder two 421, stop nut two 44; main crushing power mechanism 5, main power motor 51, belt transmission mechanism 52, small belt pulley 521, large belt pulley 522, belt 523; differential device 54, sprocket I 541, sprocket II 542, tensioning sprocket III 543, chain 544, fixing block 545, tensioning screw 546, tensioning wheel mounting seat 547, base plate 5471, kidney-shaped hole 54711, vertical plate 5472, tensioning wheel support rod 548, pin shaft 5493; joint seat plate assembly 55, seat plate 551, support rod one 552, "U" type bayonet 553, adjusting screw 554, sliding sleeve 555, support rod two 556; feeding space 6; main and driven roller gap adjusting device 7, convex connecting block 71, connecting part 711, preloading spring 72, fixing plate 73, adjusting rod 74, adjusting nut 75, nut 76; material receiving device 8. Detailed implementation mode

[0040] The following is a detailed example of the preferred embodiment of the present invention in conjunction with the accompanying drawings, but the protection scope of the present invention cannot be limited by this preferred embodiment.

[0041] See Figure 1 , the figure shows a pair of roller device for crushing large-grained ore materials according to the present invention, which includes: a driving roller 3 and a driven roller 4 arranged in parallel between the left and right side plates 21 of the frame 2, and the gap between the driving roller 3 and the driven roller 4 is driven according to the crushing particle size, generally 3 mm; a feeding space 6 with a "V" - shaped cross-section is formed between the driving roller 3 and the driven roller 4; the feature of the present invention is that: a feeding auxiliary crushing device 1 is arranged above the driven roller 4, and the feeding auxiliary crushing device 1 includes an extrusion plate 19 that can reciprocate towards the lower part of the feeding space 6 and in the reverse direction outside the driven roller 4, and an auxiliary crushing power mechanism 10 for driving the reciprocating movement of the extrusion plate 19.

[0042] See Figure 2 、 3, in this embodiment, specifically, the extrusion plate 19 is preferably in the shape of an arc-shaped plate; in order to prevent the reciprocating extrusion movement of the extrusion plate 19 from interfering with the driven roller 4 and to ensure that it completes the extrusion action within a suitable movement range, preferably, arc-shaped guide rails 110 for providing the movement trajectory of the extrusion plate 19 are provided on the inner sides of the left and right side plates 21 of the frame 2. The arc-shaped guide rails 110 are composed of two arc-shaped plates arranged coaxially at intervals, and an arc-shaped track for the extrusion plate 19 to perform arc-shaped movement is formed between the two arc-shaped plates; the radius of the arc-shaped guide rails 110 is greater than the radius of the driven roller 4, so that the extrusion plate 19 does not interfere with the driven roller 4; it should be noted that the extrusion plate 19 and the arc-shaped guide rails 110 can be coaxially arranged with the driven roller 4 or can have a certain eccentricity, mainly based on not interfering with the driven roller 4. The auxiliary crushing power mechanism 10 includes: a reduction motor 12, a crank disk 13, and a connecting rod 15. The reduction motor 12 is installed on the cross beam 22 of the frame 2 through a motor mounting bracket 11. The crank disk 13 is arranged on the output shaft of the reduction motor 12. One end of the connecting rod 15 is hinged to the crank disk 13 through a hinge pin; the other end of the connecting rod 15 is hinged to the rear end of the extrusion plate 19, driving the extrusion plate 19 to reciprocate downward and in the reverse direction in the feeding space 6. Specifically, two connecting ears 191 are provided at the rear end of the extrusion plate 19. The two free ends of a U-shaped hinge pin connecting block 16 are hinged to the connecting ears 191 through hinge pins, and the other end of the connecting rod 15 is connected to the horizontal plate of the hinge pin connecting block 16 through a threaded fixing member. During use, the reduction motor 12 drives the crank disk 13 to rotate, further driving the connecting rod 15 and the extrusion plate 19 to perform reciprocating movements. The large particle ore blocks in the "V"-shaped feeding space 6 are extruded by the extrusion plate 19, and the cylindrical wall of the driving roller forms an extrusion wall, generating extrusion on the large particle ore blocks sandwiched in the middle, thereby extruding and crushing the large particle ore blocks, playing an auxiliary crushing function before the roll crushing. At the same time, the extrusion plate 19 increases the pressure between the ore material and the roller wall of the driving roller, increasing the friction between the large particle ore blocks and the roller wall, so that they are more easily "rolled into" the gap between the two rollers, forming an effective roll crushing and improving the crushing efficiency.

[0043] In this embodiment, the extrusion plate 19 is designed to be arc-shaped, which is conducive to performing the extrusion action along the surface of the driven roller 4 towards the feeding space 6. In this way, the extrusion plate 19 can also not block the upper feeding opening of the "V"-shaped feeding space 6, and at the same time, there will be no movement interference with the driven roller 4. Obviously, the extrusion plate 19 can also be designed to be straight-shaped, inclined above the driven roller 4, with its lower end facing the "V"-shaped feeding space 6 and performing reciprocating movements towards the lower part of the feeding space 6 and in the reverse direction. However, using a straight-shaped extrusion plate 19 requires higher requirements for the movement trajectory to avoid interfering with the driven roller 4.

[0044] In the above embodiments, the arc-shaped guide rail 110 is directly provided inside the two side plates 21 of the frame 1. The following provides another installation method for the arc-shaped guide rail 110: An inner baffle 17 is respectively provided inside the left and right two side plates 21 of the frame 2, and the arc-shaped slide rail 110 is welded and fixed inside the inner baffle 17; Two mounting seat blocks 18 are connected to the outer side of the inner baffle 17, and the mounting seat blocks 18 can be locked to the two side plates 21 on the frame 2 by screws. This installation method facilitates the addition of a feeding auxiliary crushing device 1 to the existing roller device.

[0045] In the above embodiment, the connecting rod 15 is a rigid straight rod. During the extrusion movement, the impact force borne by the connecting rod 15 is very large. In order to buffer the extrusion force and further protect transmission components such as the extrusion plate 19 and the connecting rod 15, another structural form of the connecting rod 15 is given: The connecting rod 15 includes two sections arranged front and back: a first section 151 and a tail section 152. The tail section 152 is hinged to the crank disc 13, and the first section 151 is hinged to the rear end of the extrusion plate 19. A buffer spring 14 for buffering the extrusion force of the extrusion plate 19 is connected between the tail section 152 and the first section 151. When the extrusion plate 19 extrudes the ore forward, the buffer spring 14 contracts, making the extrusion force gentle without generating rigid impact. This is beneficial to protecting the equipment and also beneficial to extrusion and crushing without getting stuck. Especially when there are impurities such as iron ore in the material to be crushed, using this flexible extrusion plate structure will not damage the equipment.

[0046] See Figure 10 , 11 , the figure shows the working principle of the feeding auxiliary crushing device 1 of the present invention. As Figure 10 shown, when the extrusion plate 19 of the feeding auxiliary crushing device 1 is in a fully open state (i.e., a non-working state or a state without a feeding auxiliary crushing device), large particle ore has a small frictional force with the surfaces of the main and driven rollers 3 and 4 and cannot be squeezed into the crushing gap. That is, the large particle ore "dances" between the two rollers and cannot enter the lower part of the "V"-shaped feeding space 6 between the rollers, thus affecting the roller crushing efficiency or not being able to crush at all, resulting in a situation of material blockage or machine jamming.

[0047] As Figure 11As shown, during the reciprocating motion of the feeding auxiliary crushing device 1, under the driving force of the reduction motor 12, the front end of the extrusion plate 19 can squeeze, smash, or crack the large-particle ore materials "blocked" between the two rollers. The crushed, smashed, squeezed, or cracked sample materials can then continue to enter the gap between the main and driven rollers for double-roll crushing. Therefore, after adding the feeding auxiliary crushing device 1 to the present invention, the double-roll crushing can greatly improve the crushing efficiency and avoid the occurrence of material blockage or machine jamming. When the extrusion plate 19 works continuously (i.e., reciprocally switches between the open and closed states), the large-particle ore materials entering the V-shaped feeding space 6 during this period are squeezed, smashed, or cracked in advance, and the two rollers also continuously rotate towards each other, thus forming a continuous double-roll crushing operation for ore materials.

[0048] See Figure 1 , for the double-roll device capable of adapting to the crushing of large-particle ore materials described in the present invention, it further includes: a main crushing power mechanism 5 installed on the frame 2 for driving the rotation of the driving roller 3 and the driven roller 4. The main crushing power mechanism 5 includes a main power motor 51 installed at the bottom of the frame 2, and the main power motor 51 transmits power to the driving roller 3 through a belt transmission mechanism 52; the other end of the driving roller 3 transmits power to the driven roller 4 through a differential device 54.

[0049] See Figure 4 , the driving roller 3 includes a driving roller barrel 31 and a driving roller barrel shaft 32 passing through its central position. A set of pedestal bearings 33 are provided at the left and right ends of the driving roller barrel shaft 32, and these pedestal bearings 33 are installed and fixed on the left and right side plates 21 of the frame 2; a shoulder one 321 is provided at the left end of the driving roller barrel shaft 32, and a locking nut one 34 is provided at the right end, for axially fixing the driving roller barrel 31, and the axial clearance of the driving roller barrel 31 can be adjusted through the locking nut one 34; See Figure 5 , the driven roller 4 includes a driven roller barrel 41 and a driven roller barrel shaft 42 passing through its central position. A set of square pedestal bearings 43 are provided at the left and right ends of the driven roller barrel shaft 42. Horizontal elongated holes are respectively provided on the left and right side plates 21 of the frame 2 as card slots, and these square pedestal bearings 43 are installed in the card slots. A shoulder two 421 is provided at the left end of the driven roller barrel shaft 42, and a locking nut two 44 is provided at the right end, for axially fixing the driven roller barrel 41, and the locking nut two 44 is used to adjust the axial clearance of the driven roller barrel 41.

[0050] See Figure 1 , Figure 6 , the belt transmission mechanism 52 includes a small belt pulley 521 provided at the output shaft end of the main power motor 51, a large belt pulley 522 provided at the end of the driving roller barrel shaft 32, and a belt 523 connecting the small belt pulley 521 and the large belt pulley 522.

[0051] See Figure 6, the driving motor 51 is mounted on the frame 2 through an adjusting seat plate assembly 55. The adjusting seat plate assembly 55 includes a seat plate 551 for mounting the driving motor 51. A mounting support rod I 552 is welded to one side of the seat plate 551, and two "U"-shaped bayonets 553 are provided on the other side. An adjusting screw rod 554 passes through the bayonet 553, and the other end of the adjusting screw rod 554 is rotatably sleeved on a mounting support rod II 556 through a sliding sleeve 555. Both ends of the mounting support rods I and II are fixed to the bottoms of the left and right side plates 21 of the frame 2 by fasteners. By changing the connection position of the adjusting screw rod 554 and the "U"-shaped bayonet 553, that is, adjusting the installation length of the adjusting screw rod 554, the installation angle of the seat plate 551 can be changed, and further the distance between the small pulley 521 at the end of the driving motor 51 and the large pulley 522 can be changed, so as to adjust the tension of the belt.

[0052] See Figure 7 , 8 , the differential device 54 includes: sprocket I 541, sprocket II 542, tensioning sprocket III 543 and chain 544. Sprocket I 541 is mounted on the other end of the main roller shaft 32 of the main roller 3 opposite to the large pulley 522; sprocket II 542 is mounted on the other end of the driven roller shaft 42 of the driven roller 4. Among them, sprocket II 542 is placed outside the chain 544, and the diameter of sprocket II 542 is larger than that of sprocket I 541. Thus, the rotational speed of the driven roller can be made lower than that of the main roller to achieve the purpose of differential.

[0053] The tensioning sprocket III 543 is installed on the outer side surface of the side plate 21 of the frame 2. The sprocket I 541, sprocket II 542 and tensioning sprocket III 543 are connected in series by a chain 544, and the chain 544 is wound around. Specifically, between the sprocket I 541 and the tensioning sprocket III 543. The tensioning sprocket III 543 is fixed on the tensioning wheel mounting seat 547 by a pin shaft 549. The tensioning wheel mounting seat 547 includes a base plate 5471 for connecting with the side plate of the frame 2. The hole on the base plate 5471 for connecting with the side plate of the frame 2 is an oblong hole; a vertical plate 5472 perpendicular to the base plate 5471, and one end of a tensioning wheel support rod 548 is fixedly connected to the vertical plate 5472, and the other end is rotatably connected to the pin shaft 549 for providing auxiliary support for the tensioning sprocket III 543; one end of a tensioning screw 546 for adjusting the distance between the tensioning sprocket III 543 and the sprocket I 541 is connected to the vertical plate 5472 of the tensioning wheel mounting seat 547, and the other end of the tensioning screw 546 is connected to a fixing block 545 fixed on the side plate of the frame 2. When it is necessary to adjust the tightness of the chain, loosen the connecting bolts between the base plate 5471 and the side plate of the frame 2, loosen the front and rear locking nuts of the adjusting tensioning screw 546 and the fixing block 545, and rotate the tensioning screw 546 forward and backward, thereby driving the vertical plate 5472 and the tensioning wheel mounting seat 547 to move forward and backward, and further realizing the distance between the pin shaft 549 for installing the tensioning sprocket III 543 and the main roller shaft 32, and realizing the adjustment of the chain tightness.

[0054] See Figure 1 、 9 For the pair of roller devices capable of adapting to the crushing of large-grained ore materials described in the present invention, it further includes a set of main and driven roller gap adjusting devices 7 arranged in parallel in the card slots of the two side plates 21 of the frame 2 and using spring force as the holding force; the main and driven roller gap adjusting devices 7 are of left-right symmetric structure, with a set arranged on each side, and are symmetrically lined in the card slots of the left and right two side plates 21 respectively;

[0055] The main and driven roller gap adjusting device 7 includes: a convex connecting block 71, a pre-tightening spring 72, a fixing plate 73 and an adjusting rod 74. The front end of the convex connecting block 71 is connected to the side surface of the square block bearing 43 of the driven roller 4. The other end of the convex connecting block 71 has a U-shaped convex connecting portion 711. One end of the adjusting rod 74 is connected to the connecting portion 711. A set of pre-tightening springs 72 are arranged on the adjusting rod 74, one end of which abuts against the connecting block 71 and the other end is stopped by an adjusting nut 75. The other end of the adjusting rod 74 is locked to the fixing plate 73 by a nut 76. The fixing plate 73 is arranged in parallel with the square block bearing 43 of the driven roller 4 in the clamping grooves of the left and right side plates 21 of the frame 2 and is fixed by screws. When adjusting the gap between the main and driven rollers, loosen the adjusting nut 75, rotate the nut 76 to drive the adjusting rod 74 to move forward or backward. After reaching the appropriate gap, lock the adjusting nut 75.

[0056] See Figure 1 , and it further includes a material receiving device 8 installed directly below the driving roller 3 and the driven roller 4. The material receiving device 8 can be a kind of material receiving container. In this embodiment, it is a material receiving box. It can be understood that the material receiving device 8 can be replaced by a material receiving conveyor or a sampling splitter receiving hopper. The material receiving conveyor can be arranged directly below the driving roller 3 and the driven roller 4 to convey the crushed sample material away. The sampling splitter receiving hopper can directly drop the sample material into the next-stage sampling splitter mechanism for sampling splitting.

[0057] The above description is illustrative rather than restrictive to the present invention. The present invention aims to provide a pair of rollers device adaptable to the crushing of large-grained ore materials, which aims to add a feeding auxiliary crushing device to the existing pair of rollers crushing device. Those of ordinary skill in the art understand that without departing from the spirit and scope defined by the claims, many modifications, variations or equivalents can be made, for example: changing the main power mechanism of the crushing device, using a non-differential transmission device for the driven roller, etc., but all will fall within the protection scope of the present invention.

Claims

1. A pair of roll device adaptable to large-grained ore crushing, which comprises a driving roll (3) and a driven roll (4) that are arranged in parallel between the left and right side plates (21) of a frame (2), and a feeding space (6) with a "V"-shaped cross-section is formed between the driving roll (3) and the driven roll (4); characterized in that: Above the driven roller (4), there is a feeding auxiliary crushing device (1). The feeding auxiliary crushing device (1) includes a pressing plate (19) that can reciprocate towards the lower part of the feeding space (6) and in the reverse direction outside the driven roller (4), and an auxiliary crushing power mechanism (10) for driving the reciprocating motion of the pressing plate (19).

2. The double-roller device adaptable to the crushing of large-grained ore materials according to claim 1, characterized in that: The pressing plate (19) is in the shape of an arc-shaped plate; the feeding auxiliary crushing device (1) further includes: arc-shaped guide rails (110) provided on the inner sides of the left and right side plates (21) of the frame (2) for providing the motion track of the pressing plate (19). The radius of the arc-shaped guide rails (110) is greater than the radius of the driven roller (4), so that the pressing plate (19) does not interfere with the driven roller (4); The auxiliary crushing power mechanism (10) includes: a reduction motor (12) installed on the cross beam (22) of the frame (2) through a motor mounting bracket (11). A crank disc (13) is provided on the output shaft of the reduction motor (12). One end of the crank disc (13) is connected to one end of a connecting rod (15) through a hinge pin; the other end of the connecting rod (15) is hinged to the rear end of the pressing plate (19), driving the pressing plate (19) to reciprocate towards the lower part of the feeding space (6) and in the reverse direction.

3. The pair-roll device adaptable to crushing large-grained ore materials according to claim 2, wherein: The connecting rod (15) includes two sections arranged front and rear: a first section (151) and a tail section (152). The tail section (152) is hinged to the crank disc (13), and the first section (151) is hinged to the rear end of the pressing plate (19). A buffer spring (14) for buffering the pressing force of the pressing plate (19) is connected between the tail section (152) and the first section (151).

4. The pair-roller device adaptable to the crushing of large-grained ore materials according to claim 2 or 3, characterized in that: Two connecting ears (191) are provided at the rear end of the pressing plate (19). Two free ends of a U-shaped hinge pin connecting block (16) are hinged to the hinge pin connecting block (16) through hinge pins. The other end of the connecting rod (15) is connected to the cross plate of the hinge pin connecting block (16) through a threaded fixing member.

5. The double-roller device adaptable to the crushing of large-grained ore materials according to claim 2 or 3, characterized in that: An inner baffle (17) is respectively provided between the left and right side plates (21) of the frame (2) and the arc-shaped guide rails (110). The arc-shaped slide rails (110) are welded and fixed to the inner side of the inner baffle (17); two mounting seat blocks (18) are connected to the outer side of the inner baffle (17), and the mounting seat blocks (18) can be locked to the two side plates (21) on the frame (2) by screws.

6. The pair of rolls device adaptable to the crushing of large-grained ore materials according to claim 1, characterized in that: It includes: The main crushing power mechanism (5) for driving the rotation of the driving roller (3) and the driven roller (4) mounted on the frame (2), the main crushing power mechanism (5) includes a main power motor (51) provided at the bottom of the frame (2), and the main power motor (51) transmits power to the driving roller (3) through a belt transmission mechanism (52); the other end of the driving roller (3) transmits power to the driven roller (4) through a differential device (54).

7. The pair of rollers device adaptable to the crushing of large-grained ore materials according to claim 6, characterized in that: The driving roller (3) includes a driving roller cylinder (31) and a driving roller cylinder shaft (32) passing through its central position. A set of pedestal bearings (33) are provided at the left and right ends of the driving roller cylinder shaft (32), and the pedestal bearings (33) are installed and fixed on the left and right side plates (21) of the frame (2); a shoulder one (321) is provided at the left end of the driving roller cylinder shaft (32), and a locking nut one (34) is provided at the right end, for axially fixing the driving roller cylinder (31) and adjusting the axial clearance of the driving roller cylinder (31); The driven roller (4) includes a driven roller cylinder (41) and a driven roller cylinder shaft (42) passing through its central position. A set of square pedestal bearings (43) are provided at the left and right ends of the driven roller cylinder shaft (42), and the square pedestal bearings (43) are installed in the horizontally long hole-shaped card slots on the left and right side plates (21) of the frame (2). A shoulder two (421) is provided at the left end of the driven roller cylinder shaft (42), and a locking nut two (44) is provided at the right end, for axially fixing the driven roller cylinder (41) and adjusting the axial clearance of the driven roller cylinder (41).

8. The pair of rollers device adaptable to the crushing of large-grained ore materials according to claim 7, characterized in that: The belt transmission mechanism (52) includes a small belt pulley (521) provided at the output shaft end of the main power motor (51), a large belt pulley (522) provided at the end of the driving roller cylinder shaft (32), and a belt (523) connecting the small belt pulley (521) and the large belt pulley (522); The differential device (54) includes: a sprocket I (541), installed at the other end of the driving roller cylinder shaft (32) of the driving roller (3); A sprocket II (542), installed at the other end of the driven roller cylinder shaft (42) of the driven roller (4); the sprocket I (541), the sprocket II (542) and the tensioning sprocket III (543) are connected in series through a chain (544), wherein the sprocket II (542) is placed outside the chain (544), and the diameter of the sprocket II (542) is larger than the diameter of the sprocket I (541); The tensioning sprocket III (543) is fixed on the tensioning wheel mounting seat (547) through a pin shaft (549), and the tensioning wheel mounting seat (547) includes a base plate (5471) for connecting to the side plate of the frame (2), and the hole on the base plate (5471) for connecting to the side plate of the frame (2) is a waist-shaped hole; a vertical plate (5472) perpendicular to the base plate (5471), and a tensioning wheel support rod (548) having one end fixedly connected to the vertical plate (5472) and the other end rotatably connected to the pin shaft (549) for providing auxiliary support for the tensioning sprocket III (543); One end of a tensioning screw (546) for adjusting the distance between the tensioning sprocket III (543) and the sprocket I (541) is connected to the vertical plate (5472) of the tensioning wheel mounting seat (547), and the other end of the tensioning screw (546) is connected to a fixing block (545) fixed on the side plate of the frame (2). By adjusting the forward and backward positions of the tensioning screw (546), the vertical plate (5472) and the tensioning wheel mounting seat (547) are driven to move forward and backward.

9. The roller device capable of crushing large-size mineral materials according to claim 6 is characterized in that: The main power motor (51) is installed on the frame (2) through an adjustment seat plate assembly (55). The adjustment seat plate assembly (55) includes a seat plate (551) for installing the main power motor (51). A mounting support rod (552) is welded on one side of the seat plate (551), and two "U"-shaped bayonet holes (553) are provided on the other side. An adjustment screw (554) is inserted into the bayonet hole (553). The other end of the adjustment screw (554) can be rotatably sleeved on a mounting support rod (556) through a sliding sleeve (555); the two ends of the mounting support rods (556) are fixed to the bottom of the left and right side plates (21) of the frame (2) through fasteners.

10. The pair-roll device adaptable to large-grain ore crushing according to claim 1, wherein: It also includes a set of master and slave roller gap adjustment devices (7) arranged in parallel in the slots of two side plates (21) of the frame (2) and using spring force as a retaining force; the master and slave roller gap adjustment devices (7) are of a left-right symmetrical structure, with one set arranged on each side; The main and driven roller gap adjustment device (7) comprises: A convex connection block (71) is used to connect the square seat bearing (43) of the driven roller (4); the other end of the convex connection block (71) is connected to an adjusting rod (74); the adjusting rod (74) is provided with a group of preload springs (72) with one end against the connection block (71) and the other end stopped by an adjusting nut; the other end of the adjusting rod (74) is locked on a fixing plate (73) by a nut; the fixing plate (73) and the square seat bearing (43) of the driven roller (4) are arranged in parallel in the slots of the left and right side plates (21) of the frame (2), and are fixed by screws.

11. The pair-roll device adaptable to the crushing of large-grained ore materials according to claim 1, characterized in that: It also includes a material receiving device (8) mounted directly below the active roller (3) and the driven roller (4). The material receiving device (8) can be one of: a material receiving conveyor, a material receiving hopper of a reducer, or a material receiving container.

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