Roll crusher

Abstract

To provide a roll crusher capable of efficiently moving and guiding an object to be crushed within a hopper toward a charging port by making some of the crushing teeth on a pair of rollers longer.SOLUTION: A roll crusher comprises: a first roll 40 and a second roll 50 installed in a crushing chamber 2; a first rotor 4 and a second rotor 5; and crushing teeth 42 and 52 arranged on outer peripheries of the respective rotors at predetermined intervals and positioned alternately without contact with each other while rotating and driving the rotors 4 and 5. Some of the crushing teeth 42 and 52 have elongated crushing teeth 420a and 520a which are extended to a length size such that at least their tip portions project above the height of a charging port 21 of the crushing chamber 2. The diameters of the first rotor 4 and the second rotor 5 are configured to be smaller at corresponding positions R45 and R55 where the elongated crushing teeth 420a and 520a are disposed than the diameters of the first rotor 4 and the second rotor 5 at non-corresponding positions R46 and R56.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a twin-shaft roll crusher in which the rotation axes are installed parallel to each other. [Background technology]

[0002] Patent Documents 1 and 2 disclose technologies relating to twin-shaft roll crushers. In the roll crusher shown in Patent Document 1, when raw materials are fed into a hopper, small-sized raw materials are loaded between the crushing teeth and sent to the crushing space by rotation, the compression teeth press the small-sized raw materials against the cutting teeth of the opposing rotor, causing compression and crushing, and when small-sized raw materials get stuck in the crushing space, the cutting teeth cut them to create gaps, and the crushing teeth of both the first rotor and the second rotor act in the same way to move irregularly shaped raw materials toward the crushing space, i.e., to the middle part between the first rotor and the second rotor, so that they are sandwiched between the crushing teeth and are crushed by these crushing teeth or cut by the wedge effect.

[0003] The technology shown in Patent Document 2 is a roll crusher in which comb-like crushing teeth are arranged on the outer periphery of the first and second rotors that are driven to rotate, in order to crush the material to be crushed. When the two drive cylinders on the left and right are operated, the adjustment plate set fixing base moves up and down at the center position below and between the first and second rotors. As this adjustment plate set fixing base moves up and down, the adjustment plate set, which is a unit component mounted on it, also moves up and down, adjusting the gap between the first and second rotors. This gap adjustment controls the flow of asphalt concrete, and controls the particle size of the asphalt concrete being crushed and the amount crushed per unit time.

[0004] Patent Document 3 also discloses a crusher in which a crushing chamber is provided below a hopper, which communicates with the drop port via a bottom plate that has the drop port formed therein, and crushing rollers are housed in the crushing chamber, one end of the rotating shaft of each crushing roller is connected to the output shaft of a hydraulic motor, and the crushing rollers are rotated by a hydraulic device that includes a hydraulic motor driven by an electric motor, so that the contents of the hopper, such as wood, are introduced into the drop port and crushed into small pieces.In particular, the document discloses a configuration in which a part of the crushing roller protrudes into the interior of the hopper from the drop port. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-334156 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-240018 [Patent Document 3] Registered Utility Model No. 3040517 Summary of the Invention [Problem to be solved by the invention]

[0006] The roll crushers shown in Patent Documents 1 and 2 crush waste materials of various sizes that are generated, for example, when demolishing concrete structures, but if the length of the materials to be crushed exceeds the width of the inlet that guides the materials in the hopper into the crushing chamber, they can get stuck just before the inlet and block it. If the materials to be crushed become stuck in the hopper, it becomes necessary to temporarily stop the crushing operation and move the materials in the hopper, which poses a problem of reduced efficiency.

[0007] Therefore, as shown in Patent Document 3, although it is possible to move the object to be crushed blocking the feed port by having a portion of the crushing roller protrude into the hopper beyond the drop port, the longer crushing teeth weaken the torque during crushing, which may reduce the crushing efficiency when crushing hard objects such as concrete. Therefore, it is desirable to maintain crushing capacity by lengthening the crushing teeth of only some of the crushing rollers and installing normal or short crushing teeth on the other crushing rollers, but this creates a problem of structural complexity. In particular, in the case of a two-shaft roll crusher in which the crushing rollers are arranged adjacent to each other, the structure becomes even more complex than in the case of a single-shaft roll crusher.

[0008] The present invention has been made to solve the above-mentioned problems, and aims to provide a roll crusher that can efficiently move the material to be crushed in the hopper and guide it to the inlet by making the crushing teeth on one side of two adjacent rollers longer without affecting the rotational drive of the other roller. [Means for solving the problem]

[0009] The roll crusher according to the present invention comprises a crushing chamber having an inlet on an upper surface for introducing materials to be crushed, a hopper fixed to the upper surface of the crushing chamber and guiding the materials to be crushed introduced from above to the inlet, a first rotor and a second rotor installed in the crushing chamber so that their rotation axes are parallel and rotate in at least opposite directions to each other, crushing teeth arranged side by side at a predetermined interval along the axial direction of the rotation axes on the outer peripheries of the first rotor and the second rotor and arranged alternately without contacting each other as the first rotor and the second rotor are rotated, and a drive mechanism for rotating the first rotor and the second rotor, wherein when a part of the crushing teeth moves to the highest position as at least the first rotor or the second rotor is rotated, the tip portion of the crushing teeth is in a position opposite to the front. The second rotor has long crushing teeth that extend to a long size and protrude above the height of the feed opening, and the diameter of the second rotor is formed so that, when the long crushing teeth are arranged on the first rotor, the diameter of the second rotor at a non-corresponding position corresponding to the position of the non-long crushing teeth arranged on the first rotor is smaller than the diameter of the corresponding position of the second rotor corresponding to the position of the long crushing teeth arranged on the first rotor, and the diameter of the first rotor is formed so that, when the long crushing teeth are arranged on the second rotor, the diameter of the first rotor at a non-corresponding position corresponding to the position of the non-long crushing teeth arranged on the second rotor is smaller than the diameter of the corresponding position of the first rotor corresponding to the position of the long crushing teeth arranged on the second rotor.

[0010] In this way, in the roll crusher according to the present invention, the crushing teeth are arranged alternately on the outer periphery of the first rotor and the second rotor which are installed in the crushing chamber so that their rotation axes are parallel to each other, and some of the crushing teeth have long crushing teeth which are extended to a long size so that their tip portions protrude above the height of the inlet as the first rotor or the second rotor is rotated and driven, and the diameter of the second rotor is such that, when long crushing teeth are arranged on the first rotor, the diameter of the second rotor is set to a position corresponding to the position of the long crushing teeth arranged on the first rotor, and ... The diameter of the first rotor is formed so that, when long crushing teeth are arranged on the second rotor, the diameter of the first rotor at the non-corresponding position corresponding to the position of the long crushing teeth arranged on the second rotor is smaller than the diameter of the corresponding position of the first rotor at the non-corresponding position corresponding to the position of the non-long crushing teeth arranged on the second rotor.This has the effect of making it possible to smoothly guide the object to be crushed into the crushing chamber even if the object to be crushed becomes stuck in the hopper by moving the object to be crushed using the long crushing teeth and changing its state.

[0011] Furthermore, when long crushing teeth are arranged on the outer periphery of one rotor, the diameter of the corresponding area of ​​the other rotor is smaller, so that the longest possible long crushing teeth can be arranged on one rotor without interfering with the rotational drive of the adjacent rotor on the other side, thereby achieving the effect of ensuring the movement of materials to be crushed that are stuck in the hopper. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view showing the structure of a roll portion in a roll crusher according to a first embodiment. [Figure 2] FIG. 1 is a plan view showing the structure of a roll portion in a roll crusher according to a first embodiment. [Figure 3] 1 is a side view seen from the arrow a, showing the structure of a roll portion in a roll crusher according to a first embodiment. FIG. [Figure 4] 2 is a side view seen from the arrow b showing the structure of a roll portion in the roll crusher according to the first embodiment. FIG. [Figure 5] FIG. 4 is a schematic plan view showing another first structure of the roll portion in the roll crusher according to the first embodiment. [Figure 6] FIG. 4 is a schematic plan view showing another second structure of the roll portion in the roll crusher according to the first embodiment. [Figure 7] FIG. 6 is a functional block diagram showing the configuration of a control system for a roll crusher according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] (First embodiment of the present invention) The roll crusher according to this embodiment will be described with reference to Figures 1 to 6. The roll crusher according to this embodiment is a two-shaft roll crusher that crushes concrete waste generated, for example, during the demolition of an apartment building, and that crushes the concrete to be crushed by rotating two adjacent rollers in opposite directions. Note that in addition to concrete, rocks, wood, plastic, metal, etc. can also be crushed as the object to be crushed.

[0014] FIG. 1 is a perspective view showing the structure of the roll portion in the roll crusher according to this embodiment, FIG. 2 is a plan view showing the structure of the roll portion in the roll crusher according to this embodiment, FIG. 3 is a side view seen from arrow A showing the structure of the roll portion in the roll crusher according to this embodiment, and FIG. 4 is a side view seen from arrow B showing the structure of the roll portion in the roll crusher according to this embodiment.

[0015] The roll crusher 1 comprises a crushing chamber 2 having an inlet 21 on the upper surface for introducing the material F to be crushed, a hopper 3 fixed to the upper surface of the crushing chamber 2 and guiding the material F to be crushed introduced from above to the inlet 21, a first rotor 4 having both ends of a rotating shaft 41 installed at the inlet 21 of the crushing chamber 2 in a state in which it can be rotated, a second rotor 5 arranged parallel to the first rotor 4 and having both ends of a rotating shaft 51 installed at the inlet 21 of the crushing chamber 2 in a state in which it can be rotated at least in the opposite direction to the first rotor 4, crushing teeth 42 arranged side by side on the outer periphery of the first rotor 4 along the direction of the rotating shaft 41 at a predetermined interval, crushing teeth 52 arranged side by side on the outer periphery of the second rotor 5 along the direction of the rotating shaft 51 at a predetermined interval, and a drive mechanism 6 that rotates the first rotor 4 and the second rotor 5.

[0016] The multiple crushing teeth 42 arranged in parallel on the first rotor 4 are arranged at equal intervals by disposing spacers 43 between each crushing tooth 42. As with the first rotor 4, the second rotor 5 also has spacers 53 disposed between each crushing tooth 52, so that they are arranged at equal intervals. The crushing teeth 42 of the first rotor 4 are arranged corresponding to the positions of the spacers 53 on the second rotor 5, and the crushing teeth 52 of the second rotor 5 are arranged corresponding to the positions of the spacers 43 on the first rotor 4. The crushing teeth 42 and the crushing teeth 52 are staggered so that they do not come into contact with each other as the first rotor 4 and the second rotor 5 are rotated. The first rotor 4 and the second rotor 5 have the same structure, and the crushing teeth 42 and the spacers 43, and the crushing teeth 52 and the spacers 53 also have the same structure.

[0017] As described above, the crushing teeth 42 and the crushing teeth 52 basically have the same structure, so here, only the crushing teeth 42 will be described. The crushing teeth 42 have crushing teeth 42a and guide teeth 42b, and the respective teeth are arranged to protrude from the outer periphery of the first rotor 4 at equal or unequal angular intervals.

[0018] The crushing teeth 42a are teeth that mainly bite into and crush large objects to be crushed F by a wedge effect. In the roll crusher 1 according to this embodiment, for example, the crushing teeth 42a are arranged at equal angular intervals (four at 90-degree intervals) on the outer periphery of the first rotor 4. The guide teeth 42b are teeth that mainly compress and crush the objects to be crushed F. In the roll crusher 1 according to this embodiment, for example, the guide teeth 42b are arranged at equal angular intervals (four at 90-degree intervals) on the outer periphery of the first rotor 4 between the crushing teeth 42a. The crushing teeth 42a have a longer length in the radial direction of the first rotor 4 than the guide teeth 42b (i.e., they protrude higher in the radial direction of the first rotor 4).

[0019] As described above, spacers 43 are arranged on both sides of the crushing teeth 42 to align the crushing teeth 42 at equal intervals, and crushing teeth 43a are arranged on the outer periphery of these spacers 43. The crushing teeth 43a are teeth that prevent the object to be crushed F from rolling and that grind the object to be crushed F little by little, and have a shape that is shorter in length along the radial direction of the first rotor 4 than the crushing teeth 42a and guide teeth 42b (i.e., they protrude less along the radial direction of the first rotor 4).

[0020] The first roll 40 is formed by the first rotor 4, crushing teeth 42, disintegrating teeth 42a, guide teeth 42b, spacer 43 and grinding teeth 43a, and the second roll 50 is formed by the second rotor 5, crushing teeth 52, disintegrating teeth 52a, guide teeth 52b, spacer 53 and grinding teeth 53a, and the first roll 40 and the second roll 50 have the same structure.

[0021] 1 to 4, the crushing teeth 420 arranged at one end of the first roll 40 in the axial direction (for example, the upper end in FIG. 2) are formed to extend in a long size so that when the crushing teeth of the crushing teeth 420 move to the highest position as the first rotor 4 is rotated, at least the tip portions thereof protrude above the height of the inlet 21 of the crushing chamber 2. Note that the crushing teeth formed in this long size will hereinafter be referred to as long crushing teeth 420a.

[0022] That is, the long crushing teeth 420a arranged at one end in the axial direction of the first rotor 4 have a shape that is longer in length along the radial direction of the first rotor 4 (that is, the protruding height along the radial direction of the first rotor 4 is higher) compared to the crushing teeth 42a arranged at other positions. Also, as shown in Fig. 2, the diameter of the second rotor 5 at a position of the second rotor 5 corresponding to the position where the long crushing teeth 420a are arranged (hereinafter referred to as corresponding position R55) is formed to be smaller than the diameter of the second rotor 5 at a position of the second rotor 5 corresponding to a position where the long crushing teeth 420a are not arranged (hereinafter referred to as non-corresponding position R56).

[0023] As described above, the crushing teeth 42, 52 of the first roll 40 and the second roll 50 are staggered, so the spacers 53 of the second roll 50 are arranged at the positions of the crushing teeth 42 of the first roll 40, and the spacers 43 of the first roll 40 are arranged at the positions of the crushing teeth 52 of the second roll 50. In other words, the diameter of the second rotor 5 at the corresponding position R55 is based on the length of the long crushing teeth 420a of the first roll 40, and is sized so that at least the crushing teeth 53a of the spacer 53 arranged at the corresponding position R55 do not come into contact with the long crushing teeth 420a.

[0024] Furthermore, since the first roll 40 and the second roll 50 have the same structure, the crushing teeth 520 arranged at the other axial end of the second rotor 5 (the lower end in FIG. 2) are formed as long crushing teeth 520a extending long. In this case, the diameter of the first rotor 4 at a position of the first rotor 4 corresponding to the position where the long crushing teeth 520a are arranged (hereinafter referred to as the corresponding position R45) is smaller than the diameter of the first rotor 4 at a position of the first rotor 4 corresponding to the position where the long crushing teeth 520a are not arranged (hereinafter referred to as the non-corresponding position R46). As in the case of the second roll 50, the diameter of the first rotor 4 at the corresponding position R45 is equivalent to the length of the long crushing teeth 520a on the second roll 50, and is large enough so that at least the crushing teeth 43a of the spacer 43 arranged at the corresponding position R45 do not come into contact with the long crushing teeth 520a.

[0025] The drive mechanism 6 transmits the rotational drive of an electric motor (not shown) to the rotation shaft 41 of the first rotor 4 and the rotation shaft 51 of the second rotor 5, respectively, thereby driving the first roll 40 and the second roll 50 to rotate about the rotation shaft 41 and the rotation shaft 51. The first roll 40 and the second roll 50 crush the object F to be crushed from above while rotating in such a manner that the object F is sandwiched between their respective crushing teeth 42, 52. In other words, the first roll 40 and the second roll 50 are controlled to rotate in opposite directions. In the unlikely event that a jam occurs between the first roll 40 and the second roll 50, the object causing the jam is released by rotating the respective rollers in the opposite directions. The drive mode of the first roll 40 and the second roll 50 is controlled by a control unit (not shown) that controls the electric motor in the drive mechanism 6. The processing of this control unit will be described in detail later in the second embodiment. The structure of this drive mechanism 6 can be a commonly known drive mechanism structure, such as transmitting the rotational drive of an electric motor to the rotating shafts 41 and 51 via sprocket wheels or chains, and therefore a detailed explanation will be omitted.

[0026] In Figures 1 to 4, the long crushing teeth 420a of the first roll 40 are arranged at one end of the first rotor 4 in the axial direction, and the long crushing teeth 520a of the second roll 50 are arranged at the other end of the second rotor 5 in the axial direction, but the arrangement of the long crushing teeth 420a and the long crushing teeth 520a is not limited to this, and may be, for example, arranged as follows.

[0027] Fig. 5 is a schematic plan view showing another first structure of the roll portion in the roll crusher according to this embodiment. In the roll crusher 1 shown in Fig. 5, the long crushing teeth 420a of the first roll 40 are arranged at any position other than the end in the axial direction of the first rotor 4 (the position of the second crushing tooth 420 from the bottom in Fig. 5), and the long crushing teeth 520a of the second roll 50 are arranged at any position other than the end in the axial direction of the second rotor 5 (the position of the second crushing tooth 52 from the top in Fig. 4).

[0028] 5, the diameter of the second rotor 5 at a corresponding position R55 corresponding to the position of the long crushing teeth 420a on the first roll 40 side is small (to the extent that the long crushing teeth 420a do not come into contact with the grinding teeth 53a), and the diameter at other non-corresponding positions 56 is large (for example, the same diameter as the first rotor 4). Similarly, the diameter of the first rotor 4 at a corresponding position R45 corresponding to the position of the long crushing teeth 520a on the second roll 50 side is small (to the extent that the long crushing teeth 520a do not come into contact with the grinding teeth 43a), and the diameter at other non-corresponding positions 46 is large (for example, the same diameter as the second rotor 5).

[0029] Fig. 6 is a schematic plan view showing another second structure of the roll portion in the roll crusher according to this embodiment. In the first roll 40 and the second roll 50 of the roll crusher 1 shown in Fig. 6, long crushing teeth are arranged only on the first rotor 4 side, and not on the second rotor 5 side. Fig. 6 shows a case where the crushing teeth 42a at both ends of the crushing teeth 42 on the outer periphery of the first rotor 4 are long crushing teeth 420a.

[0030] As shown in Figure 6, when the crushing teeth 42a at both ends of the crushing teeth 42 on the first roll 40 side are configured with long crushing teeth 420a, the diameter of the second rotor 5 is formed small enough that the long crushing teeth 420a do not come into contact with the grinding teeth 53a at the corresponding positions R55 of the second rotor 5 corresponding to the positions where the long crushing teeth 420a are arranged (i.e., the positions at both ends of the second rotor 5), and is formed with a diameter approximately the same as that of the first rotor 4 at other non-corresponding positions R56.

[0031] 6 shows a configuration in which the long crushing teeth are arranged only on the first rotor 4 side, but they may be arranged only on the second rotor 5 side. Also, in FIG. 6, a configuration in which the long crushing teeth 420a are arranged on both ends of the first roll 40 is shown, but the crushing teeth 42a of any part of the crushing teeth 42 may be formed as long crushing teeth 420a, instead of on both ends.

[0032] As described above, in the roll crusher 1 according to this embodiment, the crushing teeth 42, 52 are arranged alternately on the outer periphery of the first rotor 4 and the second rotor 5 that are installed in the crushing chamber 2 so that the rotation axes 41, 51 are parallel to each other, and some of the crushing teeth 42, 52 have long crushing teeth 420a, 520a that are extended to a long size so that the tip portions thereof protrude above the height of the input port 21 as the first rotor 4 or the second rotor 5 is rotated and driven, and the diameter of the second rotor 4 is set to be 1 / 2 times the diameter of the corresponding position R55 of the second rotor 5 that corresponds to the position of the long crushing teeth 420a arranged on the first rotor 4 when the long crushing teeth 420a are arranged on the first rotor 4. The diameter of the first rotor 4 is formed so that, when long crushing teeth 520a are arranged on the second rotor 5, the diameter of the non-corresponding position R46 of the first rotor 4 corresponding to the position of the non-long crushing teeth 52a arranged on the second rotor 5 is smaller than the diameter of the corresponding position R45 of the first rotor 4 corresponding to the position of the long crushing teeth 520a arranged on the second rotor 5.Therefore, even if the material to be crushed becomes stuck in the hopper 3, the long crushing teeth 420a, 520a can move the material to be crushed F and change its state, making it possible to smoothly guide the material to be crushed F into the crushing chamber 2.

[0033] Furthermore, when long crushing teeth 420a, 520a are arranged on the outer periphery of one of the rotors 4, 5, the diameter of the corresponding area of ​​the other rotor 4, 5 is smaller, so that the longest possible long crushing teeth 420a, 520a can be arranged on one rotor 4, 5 without interfering with the rotational drive of the adjacent rotor 4, 5 on the other side, and the material to be crushed F stuck in the hopper 3 can be moved reliably.

[0034] Furthermore, the long crushing teeth 420a, 520a are arranged on the crushing teeth 42 at one end of the first rotor 4 and the crushing teeth 52 at the other end of the second rotor 5, and are formed so that the diameter of the corresponding position on one of the rotors 4, 5 at which the long crushing teeth 420a, 520a are arranged is smaller than the diameter of the corresponding position on the other rotor 4, 5.Therefore, the long crushing teeth cause a change in state in the areas at both ends of each rotor where the material to be crushed F is particularly likely to accumulate in the hopper 3, making it possible to smoothly guide the material to be crushed F into the crushing chamber 2.

[0035] Furthermore, the long crushing teeth are arranged on the crushing teeth at both ends of either the first rotor 4 or the second rotor 5, and the diameter of the corresponding position on the other rotor where the long crushing teeth are arranged is formed to be smaller, making it possible to reliably guide the object to be crushed F into the crushing chamber 2.

[0036] (Second embodiment of the present invention) The roll crusher according to this embodiment will be described with reference to Fig. 7. The roll crusher according to this embodiment effectively guides the object to be crushed F into the inlet 21 by controlling the rotation speed of the first roll 40 and / or the second roll 50. Note that in this embodiment, explanations that overlap with those of the first embodiment will be omitted.

[0037] Fig. 7 is a functional block diagram showing the configuration of the control system for the roll crusher according to this embodiment. Note that the control system shown in Fig. 7 shows only the configuration for performing processing related to the control processing of this embodiment, and actually includes other configurations that are not related to the control processing of this embodiment, and descriptions of these configurations are omitted.

[0038] 7, the control system 100 includes a roll crusher 1 and a measurement unit 200. As described in the first embodiment, the roll crusher 1 includes a first roll 40 and a second roll 50, a drive mechanism 6 that drives them, and a control unit 300 that controls the electric motor in the drive mechanism 6.

[0039] The control unit 300 adjusts the rotation speed of the first roll 40 and the second roll 50 by controlling the rotation direction and rotation speed of the electric motor. During normal operation, as described above in the first embodiment, the first roll 40 and the second roll 50 are controlled to rotate in opposite directions so that the object to be crushed F fed from above is sandwiched between the respective crushing teeth 42, 52. On the other hand, during abnormal operation in which a blockage or the like occurs between the first roll 40 and the second roll 50, the first roll 40 and the second roll 50 are controlled to rotate in opposite directions so as to release the object causing the blockage. The control unit 300 also controls the rotation speed in addition to the rotation direction. The rotation speed may be a fixed value preset according to the object to be crushed F, or an appropriate rotation speed (number of rotations) may be calculated based on the measurement results of the measurement unit 200.

[0040] Here, the measuring unit 200 includes a first measuring unit 201 that measures the amount of objects F discharged from the roll crusher 1 after being crushed, and a second measuring unit 202 that measures the amount of objects F fed into the hopper 3. The first measuring unit 201 can, for example, measure the amount of objects F discharged from the roll crusher 1 by acquiring a weight associated with the magnitude of the load from an ammeter / power meter of a conveyor that transports the objects F being discharged. Alternatively, the amount of objects F discharged can be measured by capturing images of the state at the time of discharge and the state of transport after discharge using an imaging unit and analyzing the image data. The second measuring unit 202 can, for example, measure the amount of objects F supplied to the roll crusher 1 by acquiring a weight associated with the magnitude of the load from a weight sensor or ammeter provided on a feeder, conveyor, or other supply unit. Alternatively, the amount of objects F supplied can be measured by analyzing image data from an imaging unit that captures the inside of the hopper 3.

[0041] The control unit 300 calculates the difference between the measurement results of the first measuring unit 201 and the second measuring unit 202. If the amount of materials F discharged is less than the amount of materials F introduced by a predetermined value, the control unit 300 can determine that, for example, the inlet 21 is clogged with a long object having a length greater than the size of the opening (hereinafter, the object blocking the inlet 21 is referred to as an obstruction). If this condition continues for a predetermined time or longer, the control unit 300 can determine that the obstruction in the inlet 21 cannot be moved with the current rotational state of the first roll 40 and the second roll 50, making it difficult to clear the blockage. In such cases, the blockage can often be cleared by moving the position of the obstruction blocking the inlet 21 and changing the overall arrangement of the materials F at the inlet 21. Therefore, the control unit 300 changes the rotational speed of either the first roll 40 or the second roll 50, or both.

[0042] When the first rotor 4 has long-length crushing teeth 420a on its outer periphery and the second rotor 5 has long-length crushing teeth 520a on its outer periphery, changing the rotational speed of either the first roll 40 or the second roll 50 can shift the phase of the long-length crushing teeth 420a, 520a that come into contact with the obstruction causing the blockage. In other words, the timing of the long-length crushing teeth 420a, 520a coming into contact with the obstruction can be changed. This change can move the obstruction and displace the overall arrangement of the materials F to be crushed at the inlet 21, thereby clearing the blockage. Note that when the rotational speeds of both the first roll 40 and the second roll 50 are changed, the rotational speeds are changed so that the phase of the long-length crushing teeth 420a, 520a that come into contact with the obstruction is different from the phase before the change. In other words, the rate of change of the rotational speed of the first roll 40 and the rate of change of the rotational speed of the second roll 50 are controlled to be different.

[0043] Furthermore, even if the control unit 300 changes the rotation speed of either the first roll 40 or the second roll 50, or both, if the difference between the measurement results of the first measuring unit 201 and the measurement results of the second measuring unit 202 does not change, it may determine that the long crushing teeth 420a, 520a have not reached the obstruction, and may issue a warning or the like to the operator operating the roll crusher 1.

[0044] The rotational speed of the first roll 40 and the second roll 50 may be changed at a constant rate, or may be changed linearly (for example, gradually increasing the speed, or increasing the speed once and then gradually decreasing the speed). In other words, it is desirable to control the speed so that the involvement of the obstruction is constantly changing.

[0045] Furthermore, in the above, the difference between the measurement results of the first measuring unit 201 and the second measuring unit 202 is calculated, and the rotation speed of either the first roll 40 or the second roll 50, or both, is changed when the amount of the objects to be crushed F discharged is less than the amount of the objects to be crushed F input by a predetermined value or more. However, the rotation speed of either the first roll 40 or the second roll 50, or both, may be changed based on the measurement results of the first measuring unit 201 without providing the second measuring unit 202. In other words, when the amount of the objects to be crushed F discharged after crushing has decreased by a predetermined value or more, the control unit 300 may change the rotation speed of either the first roll 40 or the second roll 50, or both, based on that condition alone.

[0046] As described above, the roll crusher 1 according to this embodiment is equipped with a first measuring unit 201 that measures the amount of material F to be crushed discharged after crushing, and a control unit 300 that adjusts the rotational speed of the first rotor 4 and / or the second rotor 5 on which the long crushing teeth 420a, 520a are arranged based on the measurement results of the first measuring unit 201. Therefore, when it can be determined from the discharge amount after crushing that the inlet 21 is blocked by an obstruction, the rotational speed of the first rotor 4 and / or the second rotor 5 is changed, thereby moving the position of the obstruction and displacing the overall position of the material F to be crushed at the inlet 21, thereby eliminating the blockage.

[0047] In addition, the hopper 3 is equipped with a second measuring unit 202 that measures the amount of material F to be crushed, and the control unit 300 adjusts the rotational speed of the first rotor 4 and / or the second rotor 5 based on the difference between the measurement results of the first measuring unit 201 and the measurement results of the second measuring unit 202.This makes it possible to reliably detect blockage of the inlet 21 from the discharge amount relative to the input amount, and to adjust the rotational speed of the first rotor 4 and / or the second rotor 5 accordingly.

[0048] If the difference between the measurement results of the first measuring unit 201 and the second measuring unit 202 is small (if the discharge amount is slightly less than the input amount), it can be determined that the crushing efficiency has deteriorated due to, for example, an oversupply or hardness of the objects to be crushed F. In such cases, the control unit 300 may perform control to increase the rotation speed of the first rotor 4 and / or the second rotor 5 to temporarily improve the work efficiency. [Explanation of symbols]

[0049] R45, R55 corresponding position R46, R56 non-compatible position 1 roll crusher 2 Crushing Room 3 Hopper 4. First rotor 5. Second rotor 6 Drive mechanism 21 Inlet 40 Roll 1 50 Roll 2 41,51 Rotation axis 42,52,420,520 Fracturing teeth 42a, 52a Crushing teeth 42b, 52b guide teeth 43,53 spacer 43a, 53a Grinding teeth 100 Control System 200 Measurement Unit 201 First Measurement Section 202 Second Measurement Section 300 control section 420a, 520a Long crushing teeth

Claims

1. a crushing chamber having an inlet on the top surface for introducing the object to be crushed; a hopper fixed to an upper surface of the crushing chamber and guiding the object to be crushed introduced from above to the introduction port; a first rotor and a second rotor that are installed in the crushing chamber so that their rotation axes are parallel to each other and are driven to rotate at least in opposite directions to each other; crushing teeth are arranged side by side at predetermined intervals along the axial direction of the rotary shaft on the outer peripheries of the first rotor and the second rotor, and are arranged alternately without contacting each other as the first rotor and the second rotor are rotated; a drive mechanism that rotationally drives the first rotor and the second rotor, A part of the crushing teeth has elongated crushing teeth that are extended to a long size so that a tip portion thereof projects above the height of the inlet when the part of the crushing teeth moves to the highest position in accordance with the rotational drive of at least the first rotor or the second rotor, The diameter of the second rotor is formed so that, when the long crushing teeth are arranged on the first rotor, the diameter of the second rotor at a non-corresponding position corresponding to the position of the long crushing teeth arranged on the first rotor is smaller than the diameter of the second rotor at a corresponding position corresponding to the position of the long crushing teeth arranged on the first rotor, A roll crusher characterized in that the diameter of the first rotor is formed so that, when the long crushing teeth are arranged on the second rotor, the diameter of the first rotor at a corresponding position on the first rotor that corresponds to the position of the long crushing teeth arranged on the second rotor is smaller than the diameter of the first rotor at a non-corresponding position that corresponds to the position of the non-long crushing teeth arranged on the second rotor.

2. The roll crusher according to claim 1, A roll crusher characterized in that the long crushing teeth are arranged on the crushing teeth at one end side of the first rotor and the crushing teeth at the other end side of the second rotor, and are formed so that the diameter of the corresponding position on one rotor where the long crushing teeth are arranged is smaller than the diameter of the corresponding position on the other rotor.

3. The roll crusher according to claim 1, A roll crusher characterized in that the long-length crushing teeth are arranged on the crushing teeth at both ends of either the first rotor or the second rotor, and the diameter of the corresponding position on the other rotor corresponding to the position on the one rotor where the long-length crushing teeth are arranged is formed to be smaller.

4. The roll crusher according to any one of claims 1 to 3, a first measuring means for measuring the amount of the object to be crushed discharged after crushing; and a control means for adjusting the rotational speed of the first rotor and / or the second rotor on which the long crushing teeth are arranged based on the measurement results of the first measuring means.

5. The roll crusher according to claim 4, a second measuring means for measuring the amount of the object to be crushed put into the hopper; A roll crusher characterized in that the control means adjusts the rotational speed of the first rotor and / or the second rotor based on a difference between the measurement result of the first measurement means and the measurement result of the second measurement means.

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