Crusher with good crushing effect

Abstract

The invention relates to the technical field of crushers, and discloses a crusher with a good crushing effect, the crusher comprises a rack, a vibrating roller, a vibrating assembly, a rotating assembly and at least one driving member, one surface of the rack is symmetrically provided with two mounting beams, and the vibrating roller is arranged on one side of the rack in a first direction and is arranged in a second direction; the vibration assembly is used for generating vibration to be transmitted to the vibration roller, so that the vibration roller generates amplitude in a first direction; the rotating roller is rotatably arranged in the rack in the second direction and located below the vibrating roller, and a crushing gap used for extruding stone is formed between the rotating roller and the vibrating roller; the driving part is arranged on one side of the rack in the second direction and used for driving the rotating roller to rotate. According to the crusher, vibration can be generated and exciting force for crushing is triggered while the vibration assembly drives the vibration roller to rotate, so that the crushing efficiency is improved, a better crushing effect is achieved, and the number of times of re-crushing of stones is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of crushers, in particular to a crusher with good crushing effect. Background Art

[0002] Crusher is the main equipment for mining. It is mainly used to crush stones of different sizes and can crush ores into the required size. Among them, roller crusher is a kind of crusher. It usually uses two crushing rollers with the same rotation speed and opposite rotation. When crushing stones, large-sized stones are slowly fed into the crushing gap between the two crushing rollers. The distance between the two points holding the stones is getting smaller and smaller, and the extrusion force is becoming more and more obvious. Finally, the stones are crushed, and small-sized stones that meet the crushing gap fall down, while stones that do not meet the requirements repeat the above swallowing and extrusion process until the particle size meets the requirements and falls down. However, the existing roller crushers have low crushing efficiency, high noise and large dust leakage, which cause serious pollution to the environment. Summary of the invention

[0003] In order to solve the above technical problem or at least partially solve the above technical problem, the present application provides a crusher with good crushing effect.

[0004] The present application provides a crusher with good crushing effect, comprising: A frame having a first direction and a second direction intersecting each other, two mounting beams being symmetrically arranged on a surface of the frame in the first direction, and the mounting beams extending along the second direction; a vibration roller, which is disposed on one side of the frame in the first direction and arranged along the second direction, and both ends of the vibration roller are rotatably connected to the mounting beam; a vibration assembly for generating vibration to be transmitted to the vibration roller so that the vibration roller generates an amplitude in the first direction; a rotating roller, which is rotatably arranged inside the frame along the second direction and is located below the vibrating roller, and a crushing gap for squeezing stones is formed between the rotating roller and the vibrating roller; At least one driving member is disposed on one side of the frame in the second direction and is used for driving the rotating roller to rotate.

[0005] In a possible embodiment, the vibration assembly includes a vibration source, an eccentric shaft and a plurality of eccentric wheels, the eccentric shaft is provided on one side of the frame in the first direction and is arranged along the second direction, the two ends of the eccentric shaft are rotatably connected to the two mounting beams respectively, and the eccentric shaft passes through the vibration roller, all the eccentric wheels are installed at intervals in the part of the eccentric shaft located inside the vibration roller, and the eccentric wheels are abutted against the inner surface of the vibration roller, the vibration source is installed on one of the two mounting beams and is located on one side of the vibration roller in the second direction, and the vibration source is connected to one end of the eccentric shaft.

[0006] In a possible embodiment, it also includes an adjustment component, which includes a fixing frame and an adjustment rod, the fixing frame is arranged on the surface of the mounting beam away from the frame, and the fixing frame is provided with a through hole, the vibration source is passed through the through hole and is connected to the eccentric shaft, the adjustment rod is arranged at one end of the fixing frame in the second direction, and the end of the adjustment rod close to the fixing frame is connected to the fixing frame for pushing the fixing frame to move back and forth on the mounting beam along the second direction.

[0007] In a possible implementation manner, a plurality of first fixing holes are spaced apart along the second direction on the mounting beam, and second fixing holes matching the first fixing holes are formed at both ends of the fixing frame in the second direction.

[0008] In a possible implementation manner, the rack has a third direction, and the third direction, the first direction, and the second direction intersect in pairs; The driving members are provided with two, namely a first driving member and a second driving member, the first driving member and the second driving member are symmetrically arranged, and the first driving member and the second driving member are respectively connected to two ends of the rotating roller to jointly drive the rotating roller to rotate.

[0009] In a possible embodiment, the rotating roller includes a rotating shaft and a roller body mounted on the rotating rod, the rotating shaft is rotatably disposed in the frame along the third direction, and both ends of the rotating shaft are respectively connected to the first driving member and the second driving member, and the crushing gap is formed between the outer peripheral surface of the roller body and the outer peripheral surface of the vibration roller.

[0010] In a possible implementation manner, it further includes a coupling, and the first driving member is connected to an end of the rotating shaft close to the first driving member through the coupling; and / or, The second driving member is connected to an end of the rotating shaft close to the second driving member through the coupling.

[0011] In a possible implementation, it further includes a first fixing seat and a second fixing seat, wherein the first fixing seat and the second fixing seat are respectively arranged on both sides of the frame in the third direction, the first driving member is fixed on the first fixing seat, and the second driving member is fixed on the second fixing seat.

[0012] In a possible embodiment, a connecting plate is fixedly connected to the lower surface of both ends of the mounting beam, a first mounting hole is formed on the portion of the connecting plate extending out of the mounting beam, and a second mounting hole is formed on the surface of the frame close to the vibration roller in the first direction, and the second mounting hole is adapted to match the first mounting hole.

[0013] In a possible embodiment, it also includes a drop plate, which is arranged in front of the vibrating roller and above the rotating roller, and the drop plate is obliquely connected to the frame to guide the stone to the crushing gap.

[0014] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art: By arranging a rotatable rotating roller inside the frame and arranging a vibrating roller on one side of the frame in the first direction, so that a crushing gap is formed between the vibrating roller and the rotating roller, when the stone needs to be crushed, the stone is passed into the crushing gap, at which time the vibrating roller and the rotating roller clamp the stone together, and then the driving member drives the rotating roller to rotate, and the vibration component drives the vibrating roller to rotate relatively, and then the stone between the vibrating roller and the rotating roller is crushed into stones of the size of the gap through the clamping force, and then falls onto the conveyor belt and is transported to a designated location. In addition, the vibration component generates vibration while driving the vibrating roller to rotate and induces an exciting force for crushing, so as to improve the crushing efficiency and have a better crushing effect, thereby greatly reducing the number of times the stone needs to be crushed again. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment of a crusher with good crushing effect according to the present invention; Figure 2 It is a schematic diagram of a vibrating roller and a vibrating assembly in a crusher with good crushing effect according to the present invention; Figure 3 It is a structural schematic diagram of another embodiment of a crusher with good crushing effect according to the present invention.

[0016] Figure Number: 10. Frame; 20. Mounting beam; 20a. First fixing hole; 30. Vibrating roller; 40. Rotating roller; 50. Vibrating assembly; 51. Vibration source; 52. Eccentric shaft; 53. Eccentric wheel; 60. Adjusting assembly; 61. Fixing frame; 62. Adjusting rod; 70. Driving member; 71. First driving member; 72. Second driving member; 80. First fixing seat; 90. Second fixing seat; 100. Coupling; 110. Blanking plate; X. First direction; Y. Second direction. DETAILED DESCRIPTION

[0017] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0018] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0019] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0020] like Figure 1 and Figure 2 As shown, the present application provides a crusher with good crushing effect, the crusher includes a frame 10, a vibration roller 30, a vibration assembly 50, a rotating roller 40 and at least one driving member 70, the frame 10 has a first direction X and a second direction Y intersecting each other, and a surface of the frame 10 in the first direction X is symmetrically provided with two mounting beams 20, and the mounting beams 20 extend along the second direction Y. The vibration roller 30 is arranged on one side of the frame 10 in the first direction X and arranged along the second direction Y, and both ends of the vibration roller 30 are rotatably connected to the mounting beam 20. The vibration assembly 50 is used to generate vibration to be transmitted to the vibration roller 30, so that the vibration roller 30 generates an amplitude in the first direction X. The rotating roller 40 is rotatably arranged inside the frame 10 along the second direction Y and is located below the vibration roller 30, and a crushing gap for squeezing stone is formed between the rotating roller 40 and the vibration roller 30. The driving member 70 is arranged on one side of the frame 10 in the second direction Y, and is used to drive the rotating roller 40 to rotate.

[0021] Here, it should be noted that the “first direction X” and “second direction Y” mentioned above are fictitious for the purpose of describing the positional relationship of the components. Specifically, the rack 10 can be used as a reference. The “first direction X” refers to the height direction of the rack 10 (refer to Figure 1 The “second direction Y” refers to the length direction of the frame 10 (refer to Figure 1 Y direction in ).

[0022] The crusher with good crushing effect based on the above technical features is provided with a rotatable rotating roller 40 inside the frame 10, and a vibrating roller 30 is provided on one side of the frame 10 in the first direction X, so that a crushing gap is formed between the vibrating roller 30 and the rotating roller 40. When the stone needs to be crushed, the stone is passed into the crushing gap. At this time, the vibrating roller 30 and the rotating roller 40 clamp the stone together, and then the driving member 70 drives the rotating roller 40 to rotate, and the vibration component 50 drives the vibrating roller 30 to rotate relatively, and then the stone between the vibrating roller 30 and the rotating roller 40 is crushed into the stone of the gap size by the clamping force, and then falls onto the conveyor belt and is transported to a designated position. In addition, the vibration component 50 generates vibration and induces an exciting force for crushing while driving the vibrating roller 30 to rotate, so as to improve the crushing efficiency and have a better crushing effect, thereby greatly reducing the number of times the stone needs to be crushed again.

[0023] Exemplarily, the driving member 70 is used to drive the rotating roller 40 to rotate and provide power. To this end, the driving member 70 can use a power component commonly used for the rotating roller 40 in the prior art, and this is not limited. However, specifically in this embodiment, the driving member 70 uses a hydraulic motor, and the hydraulic motor is connected to an external hydraulic station through a pipeline, so that the hydraulic station provides power to drive the hydraulic motor to rotate.

[0024] Exemplarily, the vibration assembly 50 is used to generate vibration to be transmitted to the vibration roller 30, so that the vibration roller 30 generates a vibration amplitude to induce an exciting force for crushing, so as to improve the crushing efficiency and have a better crushing effect. To this end, the vibration assembly 50 can adopt the specific structure in the following embodiments, and can also adopt a component in the prior art that can make the vibration roller 30 vibrate, which is not limited.

[0025] Exemplarily, in order to better guide the stone into the crushing space, the crusher also includes a drop plate 110, which is arranged in front of the vibration roller 30 and above the rotating roller 40, and the drop plate 110 is connected to the frame 10 at an angle to guide the stone to the crushing gap. When the stone needs to be crushed, it is only necessary to pour the stone on the drop plate 110. Since the drop plate 110 is connected to the frame 10 at an angle, the stone falling on the drop plate 110 is guided into the crushing gap, and then the stone at the crushing gap is crushed under the joint action of the vibration roller 30 and the rotating roller 40. In other words, the setting of the drop plate 110 can more conveniently introduce the stone into the crushing gap, and the operation is simpler. This time, the drop plate 110 can be fixed to the frame 10 by welding, so as to enhance the overall structural strength and avoid the drop plate 110 from falling off during the pouring process, resulting in safety accidents.

[0026] like Figure 2 As shown, in a possible embodiment, the vibration assembly 50 includes a vibration source 51, an eccentric shaft 52 and a plurality of eccentric wheels 53. The eccentric shaft 52 is disposed on one side of the frame 10 in the first direction X and is arranged along the second direction Y. Both ends of the eccentric shaft 52 are rotatably connected to two mounting beams 20 respectively, and the eccentric shaft 52 passes through the vibration roller 30. All eccentric wheels 53 are installed at intervals in the portion of the eccentric shaft 52 located inside the vibration roller 30, and the eccentric wheels 53 abut against the inner surface of the vibration roller 30. The vibration source 51 is installed on one of the two mounting beams 20 and is located on one side of the vibration roller 30 in the second direction Y, and the vibration source 51 is connected to one end of the eccentric shaft 52.

[0027] Exemplarily, by arranging a plurality of eccentric wheels 53 at intervals in the eccentric shaft 52 located in the vibration roller 30, since the center of gravity of the eccentric wheel 53 is not on its eccentric shaft 52, when the vibration source 51 drives the eccentric shaft 52 to rotate, the eccentric wheel 53 makes a circular motion, thereby generating a centrifugal force (i.e., an exciting force). Since the direction of the centrifugal force changes continuously with the rotation of the eccentric wheel 53, the vibration roller 30 swings to a large extent under the action of the centrifugal force generated by the eccentric wheel 53, thereby generating vibration. The exciting force has high utilization rate, low energy consumption, low noise and long service life, can enhance the crushing force of the crushing roller, make the stone crushing effect better, and improve production efficiency. In addition, the vibration source 51 can be specifically a hydraulic vibration motor, but is not limited to this.

[0028] In a possible embodiment, an adjustment component is further included. The adjustment component 60 includes a fixing frame 61 and an adjustment rod 62. The fixing frame 61 is arranged on the surface of the mounting beam 20 away from the frame 10, and the fixing frame 61 is provided with a through hole. The vibration source 51 is passed through the through hole and is connected to the eccentric shaft 52. The adjustment rod 62 is arranged at one end of the fixing frame 61 in the second direction Y, and the end of the adjustment rod 62 close to the fixing frame 61 is connected to the fixing frame 61, so as to push the fixing frame 61 to move back and forth along the second direction Y on the mounting beam 20.

[0029] In a possible embodiment, the mounting beam 20 is provided with a plurality of first fixing holes 20a spaced apart along the second direction Y, and the fixing frame 61 is provided with second fixing holes matching the first fixing holes 20a at both ends in the second direction Y. In this way, when the size of the crushing gap needs to be adjusted, the fixing frame 61 is pushed to move relative to the mounting beam 20 to drive the vibration roller 30 to approach the rotating roller 40 until the adjustment is completed, and then the fixing frame 61 is re-fixed by using fasteners to pass through the second fixing holes and the corresponding first fixing holes 20a in sequence, thereby adjusting the size of the crushing gap, so that the size of the crushing gap can be adjusted accordingly according to actual needs, with a simple structure and convenient adjustment.

[0030] In a possible embodiment, the frame 10 has a third direction, and the third direction, the first direction X and the second direction Y intersect each other. Two driving members 70 are provided, namely a first driving member 71 and a second driving member 72, which are symmetrically arranged, and the first driving member 71 and the second driving member 72 are respectively connected to the two ends of the rotating roller 40 to jointly drive the rotating roller 40 to rotate. In this way, the first driving member 71 and the second driving member 72 are used to jointly provide the required power for driving the rotating roller 40 to rotate, ensuring that the rotation of the rotating roller 40 is more stable, and there will be no problem of being unable to rotate due to insufficient power. In addition, the first driving member 71 and the second driving member 72 use the same type of driving components to provide consistent torque when driving the rotating roller 40 to rotate, so as to avoid affecting the smooth rotation of the rotating roller 40 due to the speed difference. Among them, the first driving member 71 and the second driving member 72 can both use driving motors, but are not limited to this.

[0031] Exemplarily, taking the rack 10 as a reference object, the “third direction” refers to the width direction of the rack 10 .

[0032] In a possible embodiment, the rotating roller 40 includes a rotating shaft and a roller body sleeved on a rotating rod. The rotating shaft is rotatably arranged in the frame 10 along the third direction, and the two ends of the rotating shaft are respectively connected to the first driving member 71 and the second driving member 72, and a crushing gap is formed between the outer circumference of the roller body and the outer circumference of the vibration roller 30. In this way, when the first driving member 71 and the second driving member 72 jointly drive the rotating rod to rotate, the roller body sleeved on the rotating rod is driven to rotate, and then the stone between the vibration roller 30 and the rotating roller 40 is crushed into stones of the size of the gap through the clamping force. In addition, the roller body is connected to the rotating rod in a sleeve manner. When the roller body needs to be replaced, it only needs to be removed from the rotating rod. The structure is simple and easy to disassemble and assemble.

[0033] In a possible implementation, a coupling 100 is further included, and the first driving member 71 is connected to the end of the rotating shaft close to the first driving member 71 through the coupling 100; and / or the second driving member 72 is connected to the end of the rotating shaft close to the second driving member 72 through the coupling 100.

[0034] Here, it should be noted that the term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the front and back associated objects are in an "or" relationship. Specifically in this embodiment, the first drive member 71 is connected to the rotating shaft through a coupling 100, and the second drive member 72 is connected to the rotating shaft through a coupling 100 to ensure that the power transmitted by the first drive member 71 and the second drive member 72 is synchronously transmitted to the rotating shaft to avoid poor synchronization due to loose or loose connections.

[0035] In a possible implementation, a first fixing seat 80 and a second fixing seat 90 are further included, and the first fixing seat 80 and the second fixing seat 90 are respectively arranged on both sides of the frame 10 in the third direction, and the first driving member 71 is fixed on the first fixing seat 80, and the second driving member 72 is fixed on the second fixing seat 90. In this way, the first driving member 71 and the second driving member 72 can be fixed on the first fixing seat 80 and the second fixing seat 90 respectively, thereby completing the fixing of the first driving member 71 and the second driving member 72 on both sides of the frame 10.

[0036] In a possible embodiment, the lower surfaces of both ends of the mounting beam 20 are fixedly connected with connecting plates, and the portion of the connecting plate extending out of the mounting beam 20 is provided with a first mounting hole, and the surface of the frame 10 close to the vibration roller 30 in the first direction X is provided with a second mounting hole, and the second mounting hole is adapted to the first mounting hole. That is, when the mounting beam 20 needs to be installed on the frame 10, the mounting beam 20 is first placed on the frame 10 along the second direction Y so that the connecting plate contacts the top surface of the frame 10, and at this time, the first mounting hole is aligned with the second mounting hole, and then fasteners (such as bolts, screws, etc.) are sequentially passed through the first mounting hole and the second mounting hole, so that the mounting beam 20 is detachably connected to the frame 10; when the mounting beam 20 needs to be removed from the frame 10, the fasteners only need to be removed from the first mounting hole and the second mounting hole, and the mounting beam 20 is lifted upward, so that the mounting beam 20 can be disassembled, and the structure is simple and easy to disassemble and assemble.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A crusher with good crushing effect, characterized in that: include: A frame having a first direction and a second direction intersecting each other, two mounting beams being symmetrically arranged on a surface of the frame in the first direction, and the mounting beams extending along the second direction; a vibration roller, which is disposed on one side of the frame in the first direction and arranged along the second direction, and both ends of the vibration roller are rotatably connected to the mounting beam; a vibration assembly for generating vibration to be transmitted to the vibration roller so that the vibration roller generates an amplitude in the first direction; a rotating roller, which is rotatably arranged inside the frame along the second direction and is located below the vibrating roller, and a crushing gap for squeezing stones is formed between the rotating roller and the vibrating roller; At least one driving member is disposed on one side of the frame in the second direction and is used for driving the rotating roller to rotate.

2. The crusher with good crushing effect according to claim 1, characterized in that: The vibration assembly includes a vibration source, an eccentric shaft and a plurality of eccentric wheels. The eccentric shaft is provided on one side of the frame in the first direction and is arranged along the second direction. Both ends of the eccentric shaft are rotatably connected to the two mounting beams respectively, and the eccentric shaft passes through the vibration roller. All the eccentric wheels are installed at intervals in the portion of the eccentric shaft located inside the vibration roller, and the eccentric wheels abut against the inner surface of the vibration roller. The vibration source is installed on one of the two mounting beams and is located on one side of the vibration roller in the second direction, and the vibration source is connected to one end of the eccentric shaft.

3. The crusher with good crushing effect according to claim 2 is characterized in that: It also includes an adjustment component, which includes a fixing frame and an adjustment rod. The fixing frame is arranged on the surface of the mounting beam away from the frame, and the fixing frame is provided with a through hole. The vibration source is passed through the through hole and is connected to the eccentric shaft. The adjustment rod is arranged at one end of the fixing frame in the second direction, and the end of the adjustment rod close to the fixing frame is connected to the fixing frame for pushing the fixing frame to move back and forth on the mounting beam along the second direction.

4. The crusher with good crushing effect according to claim 3 is characterized in that: The mounting beam is provided with a plurality of first fixing holes spaced apart along the second direction, and the fixing frame is provided with second fixing holes matched with the first fixing holes at both ends in the second direction.

5. The crusher with good crushing effect according to claim 1, characterized in that: The rack has a third direction, and the third direction, the first direction and the second direction intersect each other; The driving members are provided with two, namely a first driving member and a second driving member, the first driving member and the second driving member are symmetrically arranged, and the first driving member and the second driving member are respectively connected to two ends of the rotating roller to jointly drive the rotating roller to rotate.

6. The crusher with good crushing effect according to claim 5, characterized in that: The rotating roller includes a rotating shaft and a roller body sleeved on the rotating rod. The rotating shaft is rotatably arranged in the frame along the third direction, and both ends of the rotating shaft are respectively connected to the first driving member and the second driving member. The crushing gap is formed between the outer circumference of the roller body and the outer circumference of the vibration roller.

7. The crusher with good crushing effect according to claim 6, characterized in that: It also includes a coupling, and the first driving member is connected to an end of the rotating shaft close to the first driving member through the coupling; and / or, The second driving member is connected to an end of the rotating shaft close to the second driving member through the coupling.

8. The crusher with good crushing effect according to claim 5, characterized in that: It also includes a first fixing seat and a second fixing seat, wherein the first fixing seat and the second fixing seat are respectively arranged on both sides of the frame in the third direction, the first driving member is fixed on the first fixing seat, and the second driving member is fixed on the second fixing seat.

9. The crusher with good crushing effect according to claim 1, characterized in that: A connecting plate is fixedly connected to the lower surface of both ends of the mounting beam, and a first mounting hole is provided on the portion of the connecting plate extending out of the mounting beam. A second mounting hole is provided on the surface of the frame close to the vibration roller in the first direction, and the second mounting hole is adapted to the first mounting hole.

10. The crusher with good crushing effect according to claim 1, characterized in that: It also includes a drop plate, which is arranged in front of the vibrating roller and above the rotating roller, and the drop plate is obliquely connected to the frame for guiding the stone to the crushing gap.

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