KR102609854B1 - 4 shaft for breaking apparatus - Google Patents

Abstract

The four-axis shredding device according to the present invention includes a pair of drive motors; A pair of driven shafts including a driven gear that receives the rotational force of the drive motor on one longitudinal side and a driven clutch on the other longitudinal side; A lower shaft, a plurality of lower cutters surrounding the lower shaft, a lower clutch provided on one side of the lower shaft in the longitudinal direction to receive rotational force from the driven clutch, and a lower clutch located at a certain distance from the lower clutch on the lower shaft. A pair of lower crushing shafts consisting of a lower sub-clutch provided; and an upper shaft, a plurality of upper cutters coupled to surround the upper shaft and engaged with the lower cutter, and provided on one side of the upper shaft in the longitudinal direction and selectively connected to one of the driven clutch and the lower sub-clutch. and a pair of upper crushing shafts composed of an upper clutch that is preferably movable in the longitudinal direction of the upper shaft, and when the upper clutch is connected to the lower sub-clutch, the upper crushing shaft is configured to rotate in reverse.

Description

4 shaft for breaking apparatus}

The present invention relates to a crushing device that consists of a pair of lower crushing shafts and a pair of upper crushing shafts to finely crush objects to be shredded. More specifically, it relates to a crushing device that can change the rotation direction of the upper crushing shaft without changing the rotation direction of the drive motor. This relates to a 4-axis shredding device that can resolve tangles in strings or wires and increase shredding efficiency.

In general, various wastes and recycling objects must be shredded to a predetermined size using a shredding device to facilitate handling, transportation, and processing during the treatment process.

A typical conventional shredding device has two axes installed horizontally, and shredding cutters are installed on each axis in an alternating manner, so that the shredding object is finely shredded as it passes between the rotating shredding cutters by receiving the power of the reducer, As an improved structure from this device, a four-axis crushing device with four axes as drive axes was proposed.

In the conventional four-axis crushing device, a motor, an electric gear, a first lower crushing shaft, and a second lower crushing shaft are arranged symmetrically, and a first upper crushing shaft and a first upper crushing shaft are provided on top of the first lower crushing shaft and the second crushing shaft. It consists of a structure in which the second upper crushing shaft is coupled. When the shredding object is input between the first upper shredding shaft and the second upper shredding shaft, the shredded material is pressed downward by the first upper shredding shaft and the second upper shredding shaft to crush the first lower shredding shaft and the second lower shredding shaft. It is crushed as it passes between the crushing axes.

At this time, when an object having a length in one direction, such as a string or wire, is introduced, the string or wire may be wound around the first upper crushing shaft and the second upper crushing shaft, causing a problem in which the crushing rate is lowered. In this way, when the string or wire is wound around the first upper crushing shaft and the second upper crushing shaft, the drive motor is rotated in the opposite direction to unwind the string or wire around the first upper crushing shaft and the second upper crushing shaft. You go through a process.

As described above, while the drive motor is rotating in the opposite direction, the first lower crushing shaft and the second lower crushing shaft also rotate in reverse, so there is a disadvantage in that the object to be shredded cannot be shredded.

In addition, since it takes a lot of time to change the rotation direction of the drive motor to the opposite direction, there is a problem that the crushing rate of the crushing device is significantly reduced.

KR 10-1683393 B1

The present invention was proposed to solve the above problems, and the upper crushing shaft can be rotated in reverse even without rotating the drive motor in reverse, and the lower crushing shaft can rotate forward even while the upper crushing shaft is rotating in reverse. The purpose is to provide a 4-axis crushing device that can increase crushing efficiency.

The object of the present invention is not limited to the above, and other objects not mentioned will be clearly understood by those skilled in the art from the description below.

A four-axis crushing device according to the present invention for achieving the above object includes a pair of drive motors; A pair of driven shafts having a driven gear that receives the rotational force of the drive motor on one longitudinal side and a driven clutch on the other longitudinal side; A lower shaft, a plurality of lower cutters surrounding the lower shaft, a lower clutch provided on one side of the lower shaft in the longitudinal direction to receive rotational force from the driven clutch, and a lower clutch located at a certain distance from the lower clutch on the lower shaft. A pair of lower crushing shafts consisting of a lower sub-clutch provided; and an upper shaft, a plurality of upper cutters coupled to surround the upper shaft and engaged with the lower cutter, and provided on one side of the upper shaft in the longitudinal direction and selectively connected to one of the driven clutch and the lower sub-clutch. Including a pair of upper crushing shafts composed of an upper clutch that can move preferably in the longitudinal direction of the upper shaft, wherein the upper crushing shaft is configured to rotate in reverse when the upper clutch is connected to the lower sub-clutch.

It further includes a stress detection sensor that detects torsional stress generated in the upper shaft, and when the torsional stress of the upper shaft exceeds a preset standard value, the upper clutch is connected to the lower sub-clutch.

It further includes a pressure sensor that detects the pressure applied to the outer peripheral surface of the upper shaft, and when the pressure applied to the outer peripheral surface of the upper shaft exceeds a preset standard value, the upper clutch is connected to the lower sub-clutch.

The rotation direction of the pair of upper crushing shafts is independently controlled.

Among the lower cutters, a plurality of protrusions are formed on a surface opposite to the upper cutter.

The protrusion extends to form a circle around the rotation axis of the lower cutter.

The protrusion extends in a straight line in a direction intersecting the radial direction of the lower cutter.

Among the upper cutters, a plurality of protrusions are formed on a surface opposite to the lower cutter.

The protrusion extends to form a circle around the rotation axis of the upper cutter.

The protrusion extends in a straight line in a direction intersecting the radial direction of the upper cutter.

As described above, the 4-axis crushing device according to the present invention can reversely rotate the upper crushing shaft even without reversing the drive motor, so that tangles in strings or wires can be easily resolved, and while the upper crushing shaft rotates in reverse, The lower crushing shaft has the advantage of being able to rotate forward, maintaining high crushing efficiency.

The effects of the present invention are not limited to those described above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

Figures 1 to 3 are a top view, front view, and right side view of the 4-axis crushing device according to the present invention.
Figure 4 is a perspective view showing the coupling structure of a pair of lower crushing shafts and a pair of upper crushing shafts included in the four-axis crushing device according to the present invention.
Figures 5 and 6 are plan views showing the process in which the rotational force of the first driven shaft is transmitted to the first upper crushing shaft.
Figures 7 to 10 are diagrams showing the state of use of the 4-axis crushing device according to the present invention.
Figure 11 is a plan view of the first upper crushing shaft included in the second embodiment of the four-axis crushing device according to the present invention.
Figures 12 and 13 are a side view and a state of use of the first lower cutter included in the third embodiment of the four-axis crushing device according to the present invention.
Figures 14 and 15 are a side view and a state of use of the first upper cutter included in the fourth embodiment of the four-axis crushing device according to the present invention.
Figure 16 is a side view of the first lower cutter included in the fifth embodiment of the four-axis crushing device according to the present invention.
Figure 17 is a side view of the first upper cutter included in the sixth embodiment of the four-axis crushing device according to the present invention.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. The invention may be implemented in many different forms and is not limited to the embodiments described herein.

In explaining the present invention, the size or shape of components shown in the drawings may be exaggerated or simplified for clarity and convenience of explanation.

Additionally, terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. These terms should be interpreted as meanings and concepts consistent with the technical idea of the present invention based on the content throughout this specification.

In order to clearly explain the present invention, descriptions of parts unrelated to the technical idea of the present invention have been omitted, and identical or similar components are assigned the same reference numerals throughout the specification.

Additionally, in various embodiments, components having the same configuration will be described using the same symbols only in the representative embodiment, and in other embodiments, only components that are different from the representative embodiment will be described.

Throughout the specification, when a part is said to be “connected” to another part, this includes not only “directly connected” but also “indirectly connected” through another member. Additionally, when a part "includes" a certain component, this may mean that it further includes other components rather than excluding other components, unless specifically stated to the contrary.

1 to 3 are a top view, front view, and right side view of the four-axis crushing device according to the present invention, and Figure 4 shows a pair of lower crushing shafts and a pair of upper crushing shafts included in the four-axis crushing device according to the present invention. It is a perspective view showing the coupling structure of the crushing shaft, and Figures 5 and 6 are plan views showing the process in which the rotational force of the first driven shaft is transmitted to the first upper crushing shaft.

The four-axis shredding device according to the present invention is a device for finely shredding shredding objects such as various wastes or recyclables, consisting of a pair of lower shredding axes and a pair of upper shredding axes, a pair of drive motors, and a longitudinal shredding shaft. It consists of a pair of driven shafts that receive the rotational force of the drive motor on one side, a pair of lower crushing shafts and a pair of upper crushing shafts that receive rotational force from the driven shaft and crush the object to be shredded. Additionally, a first reducer 210 and a second reducer 220 may be provided to reduce the rotational force of the first drive motor 110 and the second drive motor 120.

At this time, the lower crushing shaft is divided into a first lower crushing shaft 410 and a second lower crushing shaft 420 arranged side by side, and the upper crushing shaft is arranged to engage with the first lower crushing shaft 410. It consists of a first upper crushing shaft 510 and a second upper crushing shaft 520 disposed to engage with the second lower crushing shaft 420. The first lower crushing shaft 410 includes a first lower shaft 412 and a plurality of first lower cutters 414 surrounding the first lower shaft 412, and the first upper crushing shaft 510 It is provided with a first upper shaft 512 and a plurality of first upper cutters 514 that are coupled to surround the first upper shaft 512 and engage with the first lower cutter 414. Similarly, the second lower crushing shaft 420 includes a second lower shaft 422 and a plurality of second lower cutters 424 surrounding the second lower shaft 422, and the second upper crushing shaft 520 is provided with a second upper shaft 522 and a plurality of second upper cutters 524 that are coupled to surround the second upper shaft 522 and engage with the second lower cutter 424.

Therefore, the crushing object supplied between the first upper crushing shaft 510 and the second upper crushing shaft 520 is divided into the first lower crushing shaft by the first upper crushing shaft 510 and the second upper crushing shaft 520. After being pressed by the first lower crushing shaft 410 and the second lower crushing shaft 420, it is finely crushed by the first lower crushing shaft 410 and the second lower crushing shaft 420. In this way, the function of a pair of lower crushing shafts and a pair of upper crushing shafts to crush objects is implemented in substantially the same way in conventional crushing devices. A detailed description of the arrangement structure and operating principle of each crushing shaft is provided. Omit it.

The 4-axis shredding device configured as above has the advantage of being able to shred the shredding object more quickly and effectively, but when an object such as a string or wire is input, the string or wire is wrapped around the upper shafts 512 and 522 and becomes stuck. A phenomenon in which the crushing rate decreases occurs frequently. In this way, when a string or wire is wound around the upper shaft (512, 522), the upper shaft (512, 522) must be reversely rotated in the opposite direction to unwind the string or wire. ) is rotated in the opposite direction to release the string or wire, there is a problem in that the shredding object cannot be shredded, which reduces productivity. In particular, in order to reversely rotate the upper shafts 512 and 522, both the first drive motor 110 and the second drive motor 120 must be driven in the reverse direction. 2 Since it takes a lot of time to drive the drive motor 120 in the reverse direction, there is a problem that crushing efficiency is significantly lowered.

In order to solve the above problems, the 4-axis crushing device according to the present invention is configured to reversely rotate the upper crushing shaft without changing the driving direction of the drive motor that rotates each crushing shaft to the reverse direction. That is, the four-axis crushing device according to the present invention is configured so that the upper crushing shaft can directly receive rotational force from the driven gear or receive the rotational force of the driven gear through the lower crushing shaft.

For example, as shown in FIG. 5, the first driven shaft 310 has a first driven gear 312 that receives rotational force from the first drive motor 110 on one side in the longitudinal direction and a first driven gear 312 on the other side in the longitudinal direction. It is provided with a first driven clutch 314, and the first lower crushing shaft 410 is provided on one side in the longitudinal direction of the first lower shaft 412 and receives rotational force from the first driven clutch 314. 1 It may include a lower clutch 416 and a first lower sub-clutch 418 provided at a point of the first lower shaft 412 that is a certain distance away from the first lower clutch 416. At this time, the first upper crushing shaft 510 is provided on one side of the first upper shaft 512 in the longitudinal direction and is one of the first driven clutch 314 and the first lower sub-clutch 418. It is provided with a first upper clutch 516 movable in the longitudinal direction of the first upper shaft 512 to be selectively connected to.

Therefore, as shown in FIG. 5, when the first upper clutch 516 is moved to one end of the first upper shaft 512 and connected to the first driven clutch 314, the first upper shaft 512 is connected to the first driven clutch 314. It rotates in the forward direction by directly receiving the rotational force of the driven shaft 310, but as shown in FIG. 6, the first upper clutch 516 rotates in the other direction (left direction in this embodiment) of the first upper shaft 512. When moved to and connected to the first lower sub-clutch 418, the first upper shaft 512 receives rotational force through the first lower shaft 412 that rotates opposite to the first driven shaft 310, so it rotates in the reverse direction. It rotates.

At this time, like the first upper crushing shaft 510, the second upper crushing shaft 520 also rotates forward and reverse by transferring the second upper clutch (not shown) even if the second drive motor 120 is not rotated in reverse. It is configured to enable this, and the second upper crushing shaft 520 differs only in the mounting position compared to the first upper crushing shaft 510, but the structure and operating principle are the same, so detailed description thereof will be omitted. .

As mentioned above, the four-axis crushing device according to the present invention is capable of crushing the first upper shaft 512 and the second upper shaft 522 even if the first drive motor 110 and the second drive motor 120 are not driven in the reverse direction. ) can be rotated forward and backward, so there is an advantage that the string or wire wound around the first upper shaft 512 and the second upper shaft 522 can be released without the process of reducing crushing efficiency.

Figures 7 to 10 are diagrams showing the state of use of the 4-axis crushing device according to the present invention.

In Figures 7 to 10, the path through which the rotational force generated by the drive motor is transmitted to the lower crushing shaft and the upper crushing shaft is indicated by a thick line, and the drive motor is placed below the driven shaft so that the power transmission path can be clearly shown. indicated.

In general, when crushing an object to be shredded, the rotational force of the first drive motor 110 and the second drive motor 120 is applied to the first driven shaft 310 and the second driven shaft, respectively, as shown in FIG. 7(a). 320, the first lower crushing shaft 410 and the first upper crushing shaft 510 receive the rotational force through the first driven shaft 310, and the second lower crushing shaft 420 and the second The upper crushing shaft 520 receives rotational force through the second driven shaft 320. Therefore, as shown in Figure 7(b), the first lower crushing shaft 410 and the first upper crushing shaft 510 rotate clockwise, and the second lower crushing shaft 420 and the second upper crushing shaft ( 520) rotates counterclockwise.

At this time, the four-axis crushing device according to the present invention is such that only one of the first upper crushing shaft 510 and the second upper crushing shaft 520 can be reversely rotated. 510) and the rotation direction of the second upper crushing shaft 520 are set to be controlled independently.

Therefore, when it is determined that a string or wire is wound around the first upper crushing shaft 510, the first upper clutch 516 provided on the first upper shaft 512 moves along the first upper shaft 512 and 1 Connected to the lower Saab clutch (see Figure 6). When the first upper clutch 516 and the first lower sub-clutch 418 are connected in this way, the rotational force of the first drive motor 110 is applied to the first driven shaft 310 and It is transmitted to the first upper shaft 512 through the first lower shaft 412, and only the first upper crushing shaft 510 rotates in the opposite direction, as shown in FIG. 8(b). When all the strings or wires wound around the first upper shaft 512 are released, the first upper clutch 516 is returned to its original position to be connected to the first driven clutch 314, thereby returning to the original state shown in FIG. 7.

Likewise, when it is determined that a string or wire is wound around the second upper crushing shaft 520, the rotational force of the second driving motor 120 is applied to the second driven shaft 320 as shown in FIG. 9(a). By passing through the second lower shaft 422 and then being transmitted to the second upper shaft 522, only the second upper crushing shaft 520 is set to rotate in reverse, as shown in FIG. 9(b).

Furthermore, if it is determined that a string or wire is wound around both the first upper crushing shaft 510 and the second upper crushing shaft 520, the first drive motor 110 as shown in FIG. 10(a) The rotational force is transmitted to the first upper shaft 512 after passing through the first driven shaft 310 and the first lower shaft 412, and the rotational force of the second drive motor 120 is transmitted to the second driven shaft 320 and the first lower shaft 412. 2 By passing through the lower shaft 422 and then being transmitted to the second upper shaft 522, both the first upper crushing shaft 510 and the second upper crushing shaft 520 are It is set to rotate in reverse.

As mentioned above, the four-axis crushing device according to the present invention is configured so that the rotation of the pair of lower crushing shafts and the pair of upper crushing shafts can be independently controlled, so the user can maintain the states shown in FIGS. 7 to 10. By maintaining each for an appropriate amount of time, the efficiency of the crushing process can be maximized. At this time, each operating state maintenance time shown in FIGS. 7 to 10 can be implemented in various ways depending on various conditions such as the type of object to be shredded, the specifications of the lower shredding shaft and the upper shredding shaft, and the capacity of the driving motor.

Figure 11 is a plan view of the first upper crushing shaft 510 included in the second embodiment of the four-axis crushing device according to the present invention.

The four-axis shredding device according to the present invention can be configured to automatically detect whether a string or wire is wound around the upper shaft and reversely rotate the upper shaft around which the string or wire is wound.

For example, as shown in FIG. 11, the first upper shaft 512 may further include a stress detection sensor 600 that detects torsional stress generated in the first upper shaft 512. When a string or wire is wrapped around the first upper shaft 512, a large torsional stress is generated in the first upper shaft 512, so the size of the torsional stress detected by the stress sensor 600 is the standard value. If this occurs, it is determined that a string or wire is wound around the first upper shaft 512, and the first upper clutch 516 is connected to the first lower sub-clutch 418 to secure the first upper shaft 512. It can be set to reverse rotation. Of course, the stress sensor 600 can be equally applied to the second upper shaft 522.

Meanwhile, when a string or wire is wrapped around the first upper shaft 512, a large amount of pressure is applied to the area on the outer peripheral surface of the first upper shaft 512 where the string or wire is wrapped.

Therefore, the four-axis crushing device according to the present invention detects the amount of pressure applied to the first upper shaft 512 and detects pressure on the outer peripheral surface of the first upper shaft 512 to determine whether the string or wire is wound. A sensor (not shown) may be provided. When the pressure applied to the outer peripheral surface of the first upper shaft 512 exceeds a preset standard value, the first upper clutch 516 is connected to the first lower sub-clutch 418 and the first upper shaft 512 ) can be made to rotate in reverse. The pressure sensor can also be applied to the second upper shaft 522 in the same way.

Figures 12 and 13 are a side view and a state of use of the first lower cutter 414 included in the third embodiment of the 4-axis crushing device according to the present invention, and Figures 14 and 15 are a 4-axis crushing device according to the present invention. This is a side view and a state of use of the first upper cutter 514 included in Example 4.

In the 4-axis shredding device according to the present invention, shredding occurs at the area where the cutters come into contact with each other, and the lower cutter and the upper cutter can be set to make line contact.

For example, as shown in FIG. 12, a plurality of protrusions (g) are formed on the surface of the first lower cutter 414 opposite to the first upper cutter 514, and the protrusions (g) are as shown in FIG. 12 (a). ), it can be extended to form a circle around the rotation axis of the lower cutter.

In this way, when a plurality of protrusions (g) are formed on the surface of the first lower cutter 414, the first lower cutter 414 and the first upper cutter 514 come into line contact as shown in FIG. 13. , there is an advantage that higher crushing pressure can be realized. In addition, when the first lower cutter 414 and the first upper cutter 514 come into line contact, an empty space is secured between the two neighboring protrusions (g), so the shredding object can move more smoothly, preventing the jamming phenomenon. A preventive effect can also be expected.

At this time, the protrusion (g) may be formed on a surface of the first upper cutter 514 that faces the first lower cutter 414, as shown in FIG. 14. In this way, even when the protrusion (g) is formed on the surface of the first lower cutter 414, the first lower cutter 414 and the first upper cutter 514 are in line contact, so a higher crushing pressure is achieved. It becomes possible to implement.

Additionally, the protrusion (g) may be formed in the same way on the second lower cutter 424 and the second upper cutter 524.

Figure 16 is a side view of the first lower cutter 414 included in the fifth embodiment of the four-axis crushing device according to the present invention, and Figure 17 is a side view of the first upper cutter included in the sixth embodiment of the four-axis crushing device according to the present invention. This is a side view of the cutter 514.

When the protrusion (g) formed on the first lower cutter 414 is formed in a circular shape as in the embodiment shown in FIGS. 12 to 15, the end of the protrusion (g) is located on the surface of the first upper cutter 514. Since only a portion of the shredding object is continuously contacted, there is a risk that the shredding object may not be shredded very finely.

In order to solve the above problems, the 4-axis crushing device according to the present invention has a protrusion (g) provided on the first lower cutter 414, as shown in FIG. 16, which has a diameter of the first lower cutter 414. It may be formed to extend in a straight line in a direction intersecting the direction. In this way, when the protrusion (g) extends straight in the direction intersecting the radial direction of the first lower cutter (414), the end of the protrusion (g) contacts the entire surface of the first upper cutter (514). However, there is an advantage in that the object to be shredded can be shredded more finely.

At this time, the protrusion (g) may also be formed on the first upper cutter 514 as shown in FIG. 17, and further, the protrusion (g) may be formed on the second lower cutter 424 and the second upper cutter 524. It can also be formed in the same way.

Although the present invention has been shown and described in connection with preferred embodiments illustrating the principles of the invention, the invention is not limited to the construction and operation as so shown and described, but is limited to the appended claims. Those skilled in the art will be able to understand that many changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention.

110: first driving motor 120: second driving motor
210: first reducer 220: second reducer
310: first driven shaft 312: first driven gear
314: first driven clutch 320: second driven shaft
410: first lower crushing shaft 412: first lower shaft
414: first lower cutter 416: first lower clutch
418: first lower subclutch 420: second lower crushing shaft
422: second lower axis 424: second lower cutter
510: first upper crushing shaft 512: first upper shaft
514: first upper cutter 516: first upper clutch
520: second upper crushing shaft 522: second upper shaft
524: Second upper cutter 600: Stress detection sensor
g : projection

Claims (10)

A pair of drive motors;
A pair of driven shafts including a driven gear that receives the rotational force of the drive motor on one longitudinal side and a driven clutch on the other longitudinal side;
A lower shaft, a plurality of lower cutters surrounding the lower shaft, a lower clutch provided on one side of the lower shaft in the longitudinal direction to receive rotational force from the driven clutch, and a lower clutch located at a certain distance from the lower clutch on the lower shaft. A pair of lower crushing shafts consisting of a lower sub-clutch provided; and
An upper shaft, a plurality of upper cutters coupled to surround the upper shaft and engaged with the lower cutter, and provided on one side of the upper shaft in the longitudinal direction to be selectively connected to one of the driven clutch and the lower sub-clutch. It includes a pair of upper crushing shafts consisting of an upper clutch movable in the longitudinal direction of the upper shaft,
A four-axis crushing device, characterized in that when the upper clutch is connected to the lower sub-clutch, the upper crushing shaft rotates in reverse.
According to paragraph 1,
It further includes a stress detection sensor that detects torsional stress generated in the upper shaft,
A four-axis crushing device, characterized in that the upper clutch is connected to the lower sub-clutch when the torsional stress of the upper shaft exceeds a preset standard value.
According to paragraph 1,
It further includes a pressure sensor that detects pressure applied to the outer peripheral surface of the upper shaft,
A four-axis crushing device, characterized in that the upper clutch is connected to the lower sub-clutch when the pressure applied to the outer peripheral surface of the upper shaft exceeds a preset standard value.
According to paragraph 1,
A four-axis crushing device, characterized in that the rotation direction of the pair of upper crushing shafts is independently controlled.
According to paragraph 1,
A four-axis crushing device, characterized in that a plurality of protrusions are formed on a surface of the lower cutter opposite to the upper cutter.
According to clause 5,
A four-axis crushing device, characterized in that the protrusion extends to form a circle around the rotation axis of the lower cutter.
According to clause 5,
A four-axis crushing device, characterized in that the protrusion extends in a straight line in a direction intersecting the radial direction of the lower cutter.
According to paragraph 1,
A four-axis crushing device, characterized in that a plurality of protrusions are formed on a surface of the upper cutter opposite to the lower cutter.
According to clause 8,
A four-axis crushing device, characterized in that the protrusion extends to form a circle around the rotation axis of the upper cutter.
According to clause 8,
A four-axis crushing device, characterized in that the protrusion extends in a straight line in a direction intersecting the radial direction of the upper cutter.

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