Crushing device and crushing method

Abstract

To suppress an excessive load of an element for driving a roll feeder following aperture adjustment in a crushing apparatus that conveys an object to be crushed by using the roll feeder adjustable in aperture.SOLUTION: This crushing apparatus comprises: a crusher; a hydraulic motor 37; a roll feeder; a position sensor 43; and a control device 41. The hydraulic motor 37 generates a rotary-driving force. The roll feeder has a conveyance surface and a feed roll 12. The feed roll 12 is rotary-driven by the hydraulic motor 37. An object to be crushed is held between the conveyance surface and the feed roll 12 and conveyed toward the crusher. The position sensor 43 detects an aperture which is a distance from the conveyance surface to the feed roll 12. The control device 41 reduces the rotation speed of the feed roll 12 when the aperture detected by using the position sensor 43 changes to be reduced.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] This application mainly relates to a crushing device that conveys an object to be crushed using a roll feeder.

Background Art

[0002] The waste crushing and processing device of Patent Document 1 includes a charging chute, a roll feeder, a crusher, and a control device. The waste introduced into the charging chute is sized by the roll feeder and sent to the crusher. The control device acquires the crusher load current indicating the current value of the drive motor of the crusher. When the crusher load current is large, the control device narrows the opening degree of the roll feeder to suppress the supply amount of waste.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Patent Document 1 discloses a method for suppressing an overload of the drive source of the crusher, but does not disclose a method for suppressing an overload of the element that drives the roll feeder. In particular, Patent Document 1 does not describe the configuration for driving the roll feeder either.

[0005] This application has been made in view of the above circumstances, and its main object is to provide a configuration capable of suppressing an overload of an element that drives a roll feeder associated with the opening degree adjustment in a crushing device that conveys an object to be crushed using a roll feeder with adjustable opening degree.

Means for Solving the Problems

[0006] The problem that this application aims to solve is as described above, and next, the means for solving this problem and their effects will be explained.

[0007] According to a first aspect of this application, a crushing device having the following configuration is provided: The crushing device comprises a crusher, a motor, a roll feeder, an opening sensor, and a control device. The crusher crushes the material to be crushed. The motor generates a rotational driving force. The roll feeder has a conveying surface and a supply roll, the supply roll being rotationally driven by the motor, and the material to be crushed is sandwiched between the conveying surface and the supply roll and conveyed toward the crusher. The opening sensor detects the opening, which is the distance from the conveying surface to the supply roll. The control device reduces the rotational speed of the supply roll when the opening detected using the opening sensor changes in a direction that narrows.

[0008] According to a second aspect of this application, a roll feeder having the following configuration is provided: The roll feeder transports a material to be crushed toward a crusher. The roll feeder comprises a transport surface and a supply roll. The supply roll is rotationally driven by a motor. The material to be crushed is transported toward the crusher by rotating the supply roll while sandwiching the material between the transport surface and the supply roll. The rotational speed of the supply roll is reduced when the opening, which is the distance from the transport surface to the supply roll, changes in a direction that narrows.

[0009] According to a third aspect of this application, the following crushing method is provided: A motor is used to rotate a supply roll. The material to be crushed is sandwiched between a conveying surface and the supply roll and conveyed toward a crusher. An opening, which is the distance from the conveying surface to the supply roll, is detected. When the opening changes in the direction of narrowing, the rotation speed of the supply roll is reduced. The conveyed material to be crushed is crushed by the crusher. [Effects of the Invention]

[0010] According to this application, in a crushing device that transports materials to be crushed using a roll feeder with adjustable opening, it is possible to suppress overload of the elements that drive the roll feeder when adjusting the opening. [Brief explanation of the drawing]

[0011] [Figure 1] A schematic side view showing the overall configuration of a crushing apparatus according to one embodiment of this application. [Figure 2] Hydraulic and electrical circuits for driving and adjusting the height of the supply roll. [Figure 3] The first graph shows the magnitude of the hydraulic fluid discharge amount determined according to the opening degree. [Figure 4] The second graph shows the magnitude of the hydraulic fluid discharge amount determined according to the opening degree. [Figure 5] A flowchart illustrating the process of changing the amount of hydraulic fluid discharged according to the opening degree. [Modes for carrying out the invention]

[0012] Next, embodiments of this application will be described with reference to the drawings. First, the configuration of the crushing device 1 will be described with reference to Figure 1.

[0013] The crushing device 1 shown in Figure 1 crushes the material to be crushed into fragments by striking it. Hereafter, the material to be crushed will simply be referred to as "the material." Examples of materials fed into the crushing device 1 include scrapped cars, metal scrap, and industrial waste.

[0014] The crushing device 1 comprises a roll feeder 10 and a crusher 20. The roll feeder 10 transports the material fed into it toward the crusher. The crusher 20 crushes the material transported by the roll feeder 10.

[0015] The roll feeder 10 comprises a case 11 and a supply roll 12. The case 11 is the outer casing of the roll feeder 10, and the supply roll 12 is arranged inside. The case 11 also comprises an input opening 11a and a conveying surface 11b.

[0016] The input port 11a is an opening that allows the object to be fed into the roll feeder 10. The conveying surface 11b is the surface that conveys the object fed in from the input port 11a. In this embodiment, the conveying surface 11b is a slope, and the downstream end in the conveying direction is lower in height than the upstream end in the conveying direction. As a result, the object is conveyed along the slope toward the crusher 20 by its own weight. Alternatively, instead of using the object's own weight to convey it, a conveyor may be provided to transport the object.

[0017] The supply roll 12 is positioned at a distance from the conveying surface 11b. The supply roll 12 is rotationally driven by a hydraulic system, which will be described later. As the supply roll 12 rotates, the object sandwiched between the supply roll 12 and the conveying surface 11b is sent towards the crusher 20. The height of the supply roll 12 relative to the conveying surface 11b can also be changed by the hydraulic system, which will be described later. Hereinafter, the width of the gap between the conveying surface 11b and the supply roll 12 will be referred to as the opening. As shown in Figure 1, the opening indicated by the symbol L is the distance from the conveying surface 11b to the outer surface of the supply roll 12 in a direction perpendicular to the conveying surface 11b.

[0018] In this embodiment, two supply rolls 12 are provided. The two supply rolls 12 are connected, for example, by a chain and rotated at the same speed. The two supply rolls 12 are also supported, for example, by the same support member, and their height relative to the case 11 can be changed integrally. The two supply rolls 12 have different heights relative to the conveying surface 11b. Specifically, the opening of the supply roll 12 on the downstream side in the conveying direction is narrower than the opening of the supply roll 12 on the upstream side in the conveying direction. In this embodiment, the control described later is performed using the opening of the supply roll 12 on the downstream side in the conveying direction, but the same control may also be performed using the opening of the supply roll 12 on the upstream side in the conveying direction.

[0019] Note that the number of supply rolls 12 arranged is not limited to two, and may be one or three or more. Further, when a plurality of supply rolls 12 are arranged, the height of the supply roll 12 with respect to the conveyance surface 11b may be the same. When a plurality of supply rolls 12 are arranged, the rotation speeds of the respective supply rolls 12 may be different.

[0020] The crusher 20 includes a main shaft 21, a rotating body 22, a plurality of hammers 23, a lower grate 25, and a ceiling grate 26.

[0021] The main shaft 21 is a shaft member that is rotationally driven by a drive source (not shown). The axial direction of the main shaft 21 is parallel to the horizontal plane. However, the axial direction of the main shaft 21 may be inclined with respect to the horizontal plane. Further, the rotating body 22 is fixed to the main shaft 21.

[0022] [[ID=I2]]The rotating body 22 rotates as the main shaft 21 rotates. The hammers 23 are attached along the outer peripheral portion of the rotating body 22. The hammers 23 are rotatably attached to the rotating body 22. As the rotating body 22 rotates, the hammers 23 project outward from the rotating body 22 by centrifugal force and hit an object, and the object is crushed.

[0023] The lower grate 25 is arranged along the lower part of the rotating body 22. The lower grate 25 is provided with a discharge port having a predetermined size. Fragments that have been crushed by the hammers 23 and have become smaller than a certain size fall onto a conveyor or a vibrating feeder installed below the crushing device 1 through the discharge port of the lower grate 25 and are conveyed.

[0024] The ceiling grate 26 is arranged above the rotating body 22. The ceiling grate 26 is provided with a discharge port. Fragments that have been crushed by the rotating body 22 and have become smaller fall onto a conveyor or a vibrating feeder installed below the crushing device 1 through the discharge port of the ceiling grate 26 and are conveyed.

[0025] Next, referring to FIG. 2, a hydraulic system for rotationally driving and height adjustment of the supply roll 12 will be described.

[0026] First, the hydraulic system for rotationally driving the supply roll 12 will be described. The crushing device 1 includes a tank 31 for storing hydraulic fluid. The hydraulic fluid stored in the tank 31 is drawn out by a hydraulic pump 32. The hydraulic pump 32 is, for example, a gear pump, a piston pump, or a vane pump. The hydraulic pump 32 may be of variable capacity or fixed capacity. If the hydraulic pump 32 is of variable capacity, the amount of hydraulic fluid discharged can be changed, for example, by changing the inclination angle of the swash plate of the hydraulic pump 32.

[0027] The electric motor 33 is connected to the hydraulic pump 32 via the pump drive shaft 51. The electric motor 33 rotates when power is supplied, generating rotational driving force. With this configuration, the hydraulic pump 32 is rotationally driven by the electric motor 33. By changing the rotational speed of the electric motor 33, for example, using an inverter, the amount of hydraulic fluid discharged from the hydraulic pump 32 can be changed. A relief valve 34 and a proportional solenoid valve 35 are connected to the hydraulic pump 32.

[0028] The relief valve 34 activates when the pressure in the hydraulic circuit exceeds a threshold. When the relief valve 34 activates, the hydraulic fluid is returned to the tank 31. This prevents the pressure in the hydraulic circuit from rising too high.

[0029] The proportional solenoid valve 35 is equipped with a solenoid. As the solenoid moves in response to an externally supplied current, the opening area of ​​the proportional solenoid valve 35 changes, and the flow rate of the hydraulic fluid supplied to the hydraulic motor 37 changes. A control valve 36 is connected to the proportional solenoid valve 35.

[0030] The control valve 36 includes a solenoid and a spool. The solenoid moves in response to an externally supplied current, causing the spool to move. As a result, the circuit configuration of the control valve 36 changes, altering the direction of the hydraulic fluid supplied to the hydraulic motor 37. A proportional solenoid valve 35 may also be incorporated into the control valve 36. The hydraulic motor 37 is connected to the control valve 36.

[0031] The hydraulic motor 37 generates rotational driving force using the supplied hydraulic fluid. The hydraulic motor 37 is connected to the supply roll 12 via the roll drive shaft 52. In this configuration, the hydraulic motor 37 rotates the supply roll 12.

[0032] Next, the hydraulic system for adjusting the height of the supply roll 12 will be described. The crushing device 1 includes a hydraulic pump 61, a pump drive shaft 54, an electric motor 62, and a control valve 63 as components for adjusting the height of the supply roll 12. Since these components are the same as those of the hydraulic pump 32, pump drive shaft 51, electric motor 33, and control valve 36, a detailed explanation will be omitted. With this configuration, hydraulic fluid is supplied to the hydraulic cylinder 64.

[0033] The hydraulic cylinder 64 comprises a cylinder tube and a cylinder rod. The cylinder rod can be slid relative to the cylinder tube by supplying or discharging hydraulic fluid from the hydraulic cylinder 64. A supply roll 12 is attached to the cylinder rod via a roll support member 53. The roll support member 53 is configured to change height in accordance with the movement of the cylinder rod. This configuration allows for adjustment of the height of the supply roll 12.

[0034] The actuator for changing the height of the supply roll 12 is not limited to a hydraulic cylinder; for example, an electric cylinder can also be used. Alternatively, a hydraulic motor that rotates a hinge connected to the roll support member 53 can be used.

[0035] Furthermore, the crushing device 1 includes a control device 41, a rotation sensor 42, a position sensor 43, an operating device 44, and a display device 45.

[0036] The control device 41 comprises a computing device such as a CPU, a storage device such as flash memory, and a wired or wireless communication device. The computing device performs various controls on the crushing device 1 by executing a program stored in the storage device. For example, the control device 41 changes the rotational speed of the electric motor 33, the opening area of ​​the proportional solenoid valve 35, and the position of the spool of the control valve 36. By changing the position of the spool of the control valve 36, the supply roll 12 can be rotated, or the cylinder rod of the hydraulic cylinder 64 can be operated.

[0037] The rotation sensor 42 is a sensor that detects the rotation of the supply roll 12. The rotation sensor 42 is, for example, an encoder attached to a component that rotates integrally with the supply roll 12. The value detected by the rotation sensor 42 is output to the display device 45.

[0038] The position sensor 43 detects the position of the cylinder rod of the hydraulic cylinder 64 relative to the cylinder tube. In other words, the position sensor 43 detects the stroke position of the hydraulic cylinder 64. As described above, the position of the cylinder rod corresponds to the height of the supply roll 12. Therefore, the position sensor 43 is a sensor for calculating the opening degree of the supply roll 12 and corresponds to an opening degree sensor. The value detected by the position sensor 43 is output to the control device 41.

[0039] The opening degree sensor is not limited to the position sensor 43 of the hydraulic cylinder 64; for example, the following sensors may be used. That is, if the height of the supply roll 12 changes due to the rotation of the roll support member 53, an angle sensor installed on the rotation axis of the roll support member 53 can be used as the opening degree sensor. Alternatively, if the height of the supply roll 12 is changed by a winding machine, a rotation sensor that detects the amount of winding on the reel can be used as the opening degree sensor.

[0040] The operating device 44 is operated by the operator of the crushing device 1. The operating device 44 may be, for example, a button or lever, or a touch panel. By operating the operating device 44, the operator can adjust, for example, the height of the supply roll 12. Specifically, based on the operation performed by the operator on the operating device 44, the control device 41 generates and outputs an electrical signal to the control valve 63. As a result, the hydraulic fluid necessary to realize the operator's operation is supplied to the hydraulic cylinder 64, and the height of the supply roll 12 can be adjusted. As will be described in detail later, the control device 41 may also perform the control to adjust the height of the supply roll 12 instead of the operator.

[0041] The display device 45 is a liquid crystal display or an organic EL display, and can display various information related to the crushing device 1. Alternatively, the display device 45 may display information using an analog meter instead of a display.

[0042] The information displayed by the display device 45 includes the rotational speed of the supply roll 12 detected by the rotation sensor 42. The rotational speed of the supply roll 12 is related to the amount of material supplied to the crusher 20 and the load on the elements driving the supply roll 12 (hydraulic pump 32 and hydraulic motor 37, etc.). The operator adjusts the height of the supply roll 12 while checking its rotational speed. This makes it easier to adjust the height of the supply roll 12 more appropriately. Note that the information displayed on the display device 45 is just an example; for example, a camera may be installed near the supply roll 12, and the image acquired by the camera may be displayed on the display device 45.

[0043] Next, the relationship between the opening degree, which is the gap between the supply roll 12 and the conveying surface 11b, and the load on the electric motor 33 will be explained, followed by a description of the control to suppress overload.

[0044] When the opening angle changes to a narrower position, the supply roll 12 is pressed more firmly against the object. Consequently, the force required to rotate the supply roll 12 increases, causing the hydraulic circuit to enter a high-pressure state. This increases the load on the electric motor 33 that drives the hydraulic pump 32. In addition, much of the hydraulic fluid discharged from the hydraulic pump 32 returns to the tank 31 via the relief valve 34, resulting in an increase in the temperature of the hydraulic fluid and power loss.

[0045] In this embodiment, in order to reduce the load on the electric motor 33, control is performed to adjust the rotational speed of the supply roll 12 according to the opening degree. Also, in the following description, the amount of hydraulic fluid supplied by the hydraulic pump 32 will be simply referred to as the hydraulic fluid discharge amount. This control will be explained with reference to Figures 3 to 5. The flowchart shown in Figure 5 is executed by the control device 41.

[0046] The control device 41 acquires the value detected by the position sensor 43 (S101). Next, the control device 41 calculates the opening degree based on the value detected by the position sensor 43 (S102). There is a one-to-one correspondence between the position detected by the position sensor 43 and the height of the supply roll 12 relative to the transport surface 11b. Therefore, the control device 41 can calculate the opening degree based on the pre-determined correspondence.

[0047] Next, the control device 41 determines the amount of hydraulic fluid discharged according to the opening degree (S103). In this embodiment, as the opening degree narrows, the amount of hydraulic fluid discharged is reduced. This makes it possible to lower the rotational speed of the supply roll 12. Conversely, as the opening degree widens, the amount of hydraulic fluid discharged is increased. This makes it possible to increase the rotational speed of the supply roll 12. That is, if the opening degree changes in the direction of narrowing compared to the most recent, the determined amount of hydraulic fluid discharged decreases compared to the most recent, and the rotational speed of the supply roll 12 decreases. Also, if the opening degree changes in the direction of widening compared to the most recent, the determined amount of hydraulic fluid discharged increases compared to the most recent, and the rotational speed of the supply roll 12 increases.

[0048] The specific correspondence between the opening degree and the hydraulic fluid discharge rate (i.e., the rotational speed of the supply roll 12) is shown in Figures 3 and 4. These graphs are created in advance and stored in the control device 41. The control device 41 identifies the hydraulic fluid discharge rate corresponding to the calculated opening degree from these graphs. The control device 41 may also store the correspondence between the opening degree and the hydraulic fluid discharge rate in a tabular format or a calculation formula instead of a graph format.

[0049] In the graph of Figure 3, the hydraulic fluid discharge rate changes continuously and linearly according to the opening degree. The continuous change in the hydraulic fluid discharge rate allows for the determination of an appropriate hydraulic fluid discharge rate for each opening degree. In the graph of Figure 4, the hydraulic fluid discharge rate changes in steps according to the opening degree. The stepwise change in the hydraulic fluid discharge rate helps to suppress frequent changes in the hydraulic fluid discharge rate. Note that the relationship between opening degree and hydraulic fluid discharge rate shown in Figures 3 and 4 is just one example. Other correspondences can be used as long as there is a tendency for the hydraulic fluid discharge rate to decrease as the opening degree narrows. Alternatively, the correspondence between the opening degree and hydraulic fluid discharge rate can be used, but the correspondence between the detected value of the position sensor 43 and the hydraulic fluid discharge rate can be used. Furthermore, in the flowchart of Figure 5, the process of determining the hydraulic fluid discharge rate according to the opening degree can be replaced with a process of determining the rotational speed of the supply roll according to the opening degree.

[0050] Next, the control device 41 controls the hydraulic pump 32 or the electric motor 33 according to the determined hydraulic fluid discharge amount (S104). That is, the control device 41 controls the hydraulic pump 32 or the electric motor 33 so that the hydraulic fluid discharge amount determined in step S103 is achieved. For example, if the hydraulic pump 32 is of variable capacity, the hydraulic fluid discharge amount can be increased or decreased by increasing or decreasing its capacity. Alternatively, the hydraulic fluid discharge amount can be increased or decreased by increasing or decreasing the rotational speed of the electric motor 33. The control device 41 may also control both the hydraulic pump 32 and the electric motor 33. Furthermore, if the hydraulic motor 37 is of variable capacity, the control device 41 can also increase or decrease the amount of hydraulic fluid supplied to the supply roll 12 by changing the tilt angle of the swash plate of the hydraulic motor 37 to change its capacity, instead of controlling the hydraulic pump 32 or the electric motor 33.

[0051] For example, in the past, when the opening angle changed in a direction that narrowed, the electric motor 33 could be overloaded. In this embodiment, however, when the opening angle changes in a direction that narrows, the control device 41 reduces the amount of hydraulic fluid discharged. As a result, even if the hydraulic circuit is in a high-pressure state, the load on the electric motor 33 decreases in proportion to the reduction in the amount of hydraulic fluid discharged. In other words, overload of the electric motor 33 can be suppressed. In the past, when the opening angle was at its narrowest, the electric motor 33 could be overloaded, and the output of the electric motor 33 could reach its rated output. In this embodiment, however, because the amount of hydraulic fluid discharged is reduced when the opening angle narrows, even when the hydraulic pump 32 is at its maximum pressure when the opening angle is at its narrowest, for example, the output of the electric motor 33 will be less than its rated output due to the reduction in the discharge amount. Thus, in this embodiment, overload of the electric motor 33 can be suppressed when the opening angle narrows.

[0052] Furthermore, the flowchart shown in Figure 5 is executed repeatedly. Therefore, for example, if the opening angle changes from narrowing to widening, the control device 41 increases the hydraulic fluid discharge rate. This allows the conveying capacity of the supply roll 12 to be restored when the pressure in the hydraulic circuit returns to normal.

[0053] As described above, the crushing device 1 of this embodiment comprises a crusher 20, a hydraulic motor 37, a roll feeder 10, a position sensor 43, and a control device 41, and performs the following crushing method. The crusher 20 crushes the material to be crushed. The hydraulic motor 37 generates rotational driving force. The roll feeder 10 has a conveying surface 11b and a supply roll 12, and the supply roll 12 is rotationally driven by the hydraulic motor 37, and the material to be crushed is sandwiched between the conveying surface 11b and the supply roll 12 and conveyed toward the crusher 20. The position sensor 43 detects the opening, which is the distance from the conveying surface 11b to the supply roll 12. When the opening detected using the position sensor 43 changes in the direction of narrowing, the control device 41 reduces the rotational speed of the supply roll 12. The above technical matters constitute Feature 1.

[0054] When the opening is narrow, the force required to rotate the supply roll 12 increases, which tends to increase the load on the elements that drive the supply roll 12 (hydraulic pump 32 and hydraulic motor 37, etc.). In this situation, reducing the rotational speed of the supply roll 12 can suppress the overload on the elements that drive the supply roll 12.

[0055] In the crushing apparatus 1 of this embodiment, the control device 41 increases the rotational speed of the supply roll 12 when the opening detected by the position sensor 43 changes in the direction of widening. The above technical features constitute Feature 2.

[0056] This allows the conveying capacity of the supply roll 12 to be restored, for example, when the opening angle changes from a narrow state to a wide state.

[0057] The crushing device 1 of this embodiment is equipped with a hydraulic pump 32. The hydraulic motor 37 generates rotational driving force using the hydraulic fluid discharged by the hydraulic pump 32. The control device 41 reduces the amount of hydraulic fluid discharged by the hydraulic pump 32 when the opening angle detected by the position sensor 43 changes in the direction of narrowing, thereby reducing the rotational speed of the supply roll 12. The above technical features constitute Feature 3.

[0058] As a result, the flow rate of the hydraulic fluid is reduced, which helps to suppress overload of the elements that drive the supply roll 12, even in situations where the opening is narrow and the load tends to be high.

[0059] In the crushing apparatus 1 of this embodiment, the hydraulic pump 32 is driven by an electric motor 33. The control device 41 controls the electric motor 33 so that when the hydraulic pump 32 is at its maximum pressure when the opening is narrowest, the output of the electric motor 33 is less than the rated output. The above technical features constitute Feature 4.

[0060] This prevents the electric motor 33 from reaching its rated output, thus preventing overload of the electric motor 33.

[0061] The crushing device 1 of this embodiment includes an operating device 44 for changing the height of the supply roll 12 relative to the conveying surface 11b. The above technical features constitute characteristic 5.

[0062] This allows the operator to change the height of the supply roll 12 by operating the control device 44.

[0063] The crushing device 1 of this embodiment includes a rotation sensor 42 and a display device 45. The rotation sensor 42 detects the rotation of the supply roll 12. The display device 45 displays the rotation speed of the supply roll 12 calculated using the rotation sensor 42. The above technical features constitute the characteristic 6.

[0064] This allows the operator to adjust the height of the supply roll 12 while checking data that affects the conveyance of the roll feeder 10. Furthermore, even if the operator does not adjust the height of the supply roll 12, someone, for example, who checks or manages the operation of the crushing device 1, can understand the operating status of the crushing device 1.

[0065] Features 1 through 6 described above can be combined as appropriate, as long as no contradictions arise. For example, feature 3 can be combined with at least one of features 1 or 2. Feature 4 can be combined with at least one of features 1 through 3. Feature 5 can be combined with at least one of features 1 through 4. Feature 6 can be combined with at least one of features 1 through 5.

[0066] Preferred embodiments and modifications of the present application have been described above, but the above configuration can be modified as follows, for example.

[0067] In the above embodiment, the crushing device 1 is equipped with one rotating body 22, but the number of rotating bodies 22 is not limited to this, and may be equipped with multiple rotating bodies 22.

[0068] Although the roll feeder 10 in the above embodiment is hydraulically driven, it may also be electrically driven. In this case, an electric motor is newly provided in place of the hydraulic pump 32 and hydraulic motor 37, etc. This electric motor generates a rotational driving force, and the roll feeder 10 is rotated by this rotational driving force.

[0069] In the above embodiment, the operator adjusts the opening. Alternatively, the control device 41 may control the height of the supply roll 12. Specifically, if the control device 41 determines that the amount of material supplied to the crusher 20 should be reduced, it changes the opening in the direction of narrowing, and consequently reduces the amount of hydraulic fluid discharged. Also, if the control device 41 determines that the amount of material supplied to the crusher 20 should be increased, it changes the opening in the direction of widening, and consequently increases the amount of hydraulic fluid discharged. The determination regarding the increase or decrease in the amount of material supplied can be made, for example, based on the load on the crusher 20.

[0070] The flowchart shown in the above embodiment is just one example, and some processes may be omitted, some processes may be modified, or new processes may be added. For example, a process may be added to display on the display device 45 that the control device 41 has changed the amount of hydraulic fluid discharged. [Explanation of symbols]

[0071] 1. Crushing device 10 Roll Feeder 20 Crusher 32 Hydraulic pumps 33 Electric motor 37. Hydraulic motor (motor) 41 Control device 42 Rotation Sensor 43 Position sensor (opening degree sensor)

Claims

1. A crusher that crushes the material to be crushed, A hydraulic motor that generates rotational driving force using hydraulic fluid, A roll feeder having a conveying surface and a supply roll, wherein the supply roll is rotationally driven by the hydraulic motor, and the material to be crushed is sandwiched between the conveying surface and the supply roll and conveyed toward the crusher, An opening degree sensor for detecting the opening degree, which is the distance from the conveying surface to the supply roll, A control device that reduces the rotational speed of the supply roll so as to suppress overload of the hydraulic motor when the opening angle detected by the opening angle sensor changes in the direction of narrowing, A crushing device equipped with the following features.

2. A crushing apparatus according to claim 1, The control device is a crushing device that increases the rotational speed of the supply roll when the opening detected using the opening sensor changes in the direction of widening.

3. A crushing apparatus according to claim 1, The system includes a hydraulic pump that discharges the aforementioned hydraulic fluid, The control device is a crushing device that reduces the rotational speed of the supply roll by decreasing the amount of hydraulic fluid discharged from the hydraulic pump when the opening detected by the opening sensor changes in a direction that narrows.

4. A crushing apparatus according to claim 3, The aforementioned hydraulic pump is driven by an electric motor. The control device controls the electric motor such that when the hydraulic pump is set to maximum pressure when the opening is narrowest, the output of the electric motor is less than the rated output of the crushing device.

5. A crushing apparatus according to claim 1, A crushing apparatus comprising an operating device for performing an operation to change the height of the supply roll relative to the conveying surface.

6. A crushing apparatus according to any one of claims 1 to 5, A rotation sensor for detecting the rotation of the supply roll, A display device that displays the rotational speed of the supply roll calculated using the rotation sensor, A crushing device equipped with the following features.

7. In a roll feeder that transports materials to be crushed toward a crusher, Conveying surface and, A supply roll is rotationally driven by a hydraulic motor that generates rotational driving force using hydraulic fluid, Equipped with, The material to be crushed is sandwiched between the conveying surface and the supply roll, and the supply roll is rotated, thereby conveying the material to be crushed toward the crusher. A roll feeder that reduces the rotational speed of the supply roll so as to suppress overload of the hydraulic motor when the opening, which is the distance from the conveying surface to the supply roll, changes in a direction that narrows.

8. A hydraulic motor that generates rotational driving force using hydraulic fluid is used to rotate the supply roll, The material to be crushed is sandwiched between the conveying surface and the supply roll and conveyed toward the crusher. The opening degree, which is the distance from the conveying surface to the supply roll, is detected. When the opening angle changes in a direction that narrows, the rotational speed of the supply roll is reduced so as to suppress overload of the hydraulic motor. A crushing method comprising crushing the transported object to be crushed using the crusher.

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