JP2012135743A - Jaw crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jaw crusher capable of accessing a chute under a grizzly feeder reasonably even when opening a screen member and stopping an engine.SOLUTION: The jaw crusher is provided with: a crusher 20 that has a stationary tooth 42 and a movable tooth 43; the grizzly feeder 15 provided behind the crusher 20; and a maintenance floor 21 provided around the crusher 20. The grizzly feeder 15 includes: a feeder body 16; a backing plate 18 fixed to the feeder body 16; the screen members 17a and 17b that are provided in two or more steps back and forth between the backing plate 18 and the crusher 20, and are each supported by the feeder body 16 at its base end part through rotary shafts 61a and 61b extending right and left with a rear end part of each step as a base end part; and driving devices 68a and 68b that respectively couple the screen members 17a, 17b and the feeder body 16, and displace the screen members 17a and 17b to a maintenance posture that is turned upward from a work posture.

Description

  The present invention relates to a jaw crusher for crushing an object to be crushed such as rock.

  The jaw crusher is a type of crushing material to be crushed by rocking motion of the moving tooth with respect to the fixed tooth by putting the material to be crushed into the V-shaped crushing chamber between the fixed tooth and the moving tooth installed opposite to each other. It is a crushing device. As a device for supplying the object to be crushed to the jaw crusher, fine particles having a small particle diameter (slipping etc.) that reduce the crushing efficiency when it is supplied to the jaw crusher are sieved and removed from the object to be crushed in advance. There is a feeder having a vibration sieving function called a so-called grizzly feeder (see Patent Document 1). The grizzly feeder is provided with a backing plate provided with a comb-like sieve member on the front side in the feed direction of the material to be crushed, and when the backing plate is vibrated, the material to be crushed charged on the backing plate Is moved and separated from fine particles having a particle size when passing over the comb-shaped sieve member and supplied to the jaw crusher (see Patent Document 1).

  On the other hand, it is not a feeder that supplies the material to be crushed to the jaw crusher, but as a vibration sieve machine with the same configuration, the front and rear two-stage sieve members are rotated upward and opened in a double-split manner to open the vibration sieve machine. There is one that can clean the deposits attached to the inner wall of the chute disposed below the sieve member (see Patent Document 2).

JP 2006-247603 A Japanese Patent No. 3647559

  By the way, as shown in Patent Document 1, the jaw crusher's grizzly feeder is arranged at a relatively high position in the airframe, but there is a chute, a frame, etc. in the lower space (between the conveyor) and the chute. In many cases, it is narrow to access the inner wall and the like, and if it is accessed from below, the deposits peeled off from the chute by cleaning will fall toward the operator. For this reason, for example, in the self-propelled jaw crusher disclosed in Patent Document 1, the ladder provided on the side of the airframe is raised on the traveling device (crawler belt), and the inside of the grizzly feeder is accessed from the maintenance floor provided around the jaw crusher. Often to do. In addition, the grizzly feeder is located in the hopper, and the left and right and the rear are surrounded by the side walls that make up the hopper, so that the grizzly feeder can only be accessed from the front side (jaw crusher side) even if it goes up to the maintenance floor. Often it is not possible.

  Here, considering the case where the configuration of Patent Document 2 is applied in consideration of the cleanability inside the grizzly feeder of the jaw crusher, for example, if the lower space of the front sieve member is to be cleaned, the front sieve member is naturally removed. Although it is necessary to open, the front sieve member has a fulcrum at the front, and when opened, the sieve member stands up at the front of the grizzly feeder like a fence that hinders the operator's entry. You can't access the shoot after opening. Therefore, the procedure will open the front sieve member after the operator has moved on the receiving plate of the grizzly feeder in advance, but the opening and closing operation of the sieve member cannot be performed on the receiving member. In addition to personnel, personnel who open the sieve member are required. Moreover, in this case, the engine is started with the worker on the grizzly feeder, which is not desirable for safety.

  Therefore, an object of the present invention is to provide a jaw crusher that can easily access the chute below the grizzly feeder even after the sieve member is opened and the engine is stopped.

  In order to achieve the above object, the first invention is a crushing device frame, a fixed tooth fixed to the crushing device frame, and a crushing chamber formed between the fixed tooth and swinging with respect to the fixed tooth. A jaw crusher comprising a crushing device provided with moving teeth, a grizzly feeder provided behind the crushing device for supplying an object to be crushed, and a maintenance floor provided around the crushing device. The grizzly feeder is provided with a feeder body, a receiving plate fixed to the feeder body, and a plurality of stages in the front-rear direction between the receiving plate and the crushing device, and each stage has the rear end portion as a base end portion. A sieve member supported by the feeder main body via a rotating shaft extending in the left and right directions, and a plurality of sieve members and the feeder main body are connected to each other, and each sieve member is connected to the proximal end part. Anti Characterized in that it comprises a plurality of driving devices for displacing the distal end portion of the side from the working position towards the crushing device to the maintenance attitude is rotated the tip upward.

According to a second aspect, in the first aspect, the maintenance floors located on the left and right sides of the crushing device face the left and right sides of the front portion of the grizzly feeder.

  According to a third invention, in the first or second invention, a conveyor for carrying out the crushed material discharged from the crushing device, and a fine particle portion provided below the sieving member and sieved off by the sieving member. And a chute that leads onto the conveyor.

  According to the present invention, the chute below the grizzly feeder can be accessed without difficulty even after the sieve member is opened and the engine is stopped.

It is a side view showing the whole jaw crusher structure concerning one embodiment of the present invention. It is a top view showing the whole jaw crusher structure concerning one embodiment of the present invention. It is a sectional side view showing the internal structure of the crushing device with which the jaw crusher concerning one embodiment of the present invention was equipped, and represents the working state. It is a sectional side view showing the internal structure of the crushing device with which the jaw crusher concerning one embodiment of the present invention was equipped, and represents the state where the moving tooth was retracted. It is the side view which abbreviate | omitted and represented some members about the grizzly feeder with which the jaw crusher which concerns on one Embodiment of this invention was equipped. It is drawing for demonstrating the cleaning procedure of the grizzly feeder with which the jaw crusher concerning one embodiment of the present invention was equipped, and the state where all the front and back sieve members are in a working posture is shown. It is drawing for demonstrating the cleaning procedure of the grizzly feeder with which the jaw crusher concerning one embodiment of the present invention was equipped, and the state where the rear sieve member was displaced to the maintenance posture is shown. It is drawing for demonstrating the cleaning procedure of the grizzly feeder with which the jaw crusher concerning one embodiment of the present invention was equipped, and the state where the front sieve member was displaced to the maintenance posture is shown.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a side view showing the overall structure of a jaw crusher according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. In the following description, the right side in FIG. 1 is the front side of the jaw crusher, and the left side is the rear side of the jaw crusher.

  The jaw crusher shown in FIG. 1 and FIG. 2 is used to mine various large and small construction wastes, industrial waste, or rocks generated at construction sites such as concrete lumps carried out at the time of building demolition and asphalt lumps discharged at road repairs. It is intended to crush rocks and natural stones that are mined at the site or face, and accept and crush them as objects to be crushed. The jaw crusher of the present embodiment includes a traveling body 1 and a crushing function component 2 mounted on the traveling body 1 so that the traveling body 1 can travel on its own. However, the present invention can be applied not only to such a self-propelled jaw crusher but also to a jaw crusher that can be pulled and a stationary jaw crusher.

  The traveling body 1 includes a traveling device 3 and a main body frame 4 provided substantially horizontally above the traveling device 3. The traveling device 3 has an output shaft coupled to a track frame 5, a driven wheel 6 and a drive wheel 7 provided at both ends of the track frame 5, a crawler belt 8 wound around the driven wheel 6 and the drive wheel 7, and a shaft of the drive wheel 7. The traveling drive device 9 is provided. The main body frame 4 is provided on the track frame 5 and extends substantially horizontally in the front-rear direction.

  The crushing function component 2 includes a hopper 12 that receives an object to be crushed (a material to be crushed), a grind feeder 15 that supplies a crushed material received in the hopper 12 to a subsequent process, and a material to be crushed supplied from the grizzly feeder 15. A crushing device (jaw crusher) 20 for crushing, a conveyor 25 for carrying out crushed materials crushed by the crushing device 20 to the outside of the machine, and a power device (power unit) 40 having a built-in power source for operating devices mounted in various parts of the machine body It has.

  The hopper 12 is a frame-like member that expands upward, and is fixed to the support member 13 provided at the upper part of the rear portion of the main body frame 4 via support posts 9 and 10. As shown in FIG. 2, the hopper 12 surrounds the left and right side portions and the rear portion of the upper portion of the grizzly feeder 15, while opening the front portion of the grizzly feeder 15, that is, the portion facing the crushing device 20.

  The grizzly feeder 15 is positioned below the hopper 12 and behind the crushing device 20, and the frame-shaped main body 16 is supported by the support member 13 via the spring 14 separately from the hopper 12. Inside the feeder main body 16, a receiving plate 18 for receiving the object to be crushed is provided in the latter half part, and comb-shaped sieve members (grid plates) 17 a and 17 b for selecting the particle size of the object to be crushed are provided in the first half part. ing. A vibrator (feeder driving device) 19 that vibrates the grizzly feeder main body 16 is fixed to the lower portion of the grizzly feeder main body 16. Further, below the sieve members 17a and 17b, a chute 11 is provided that guides the fine particles removed by the sieve members 17a and 17b onto the conveyor 25.

  In addition, although the grizzly river is illustrated as the sieve members 17a and 17b, other types of sieve members such as a so-called grizzly cassette, a finger screen, a lattice-like sieve member, and a sieve member having a large number of selection holes are provided. It is also possible to use it.

  The crushing device 20 is positioned in front of the hopper 12 and the grizzly feeder 15 and is supported at the center in the front-rear direction of the main body frame 4. Although details will be described later with reference to FIG. 3 and the like, the crushing device 20 includes a pair of fixed teeth and moving teeth that are opposed to each other so that the space between them (the crushing chamber) is reduced in diameter downward. I have. The upper end of the moving tooth swing jaw is connected to a flywheel (not shown). When the rotational power of the crushing device drive device (not shown) is transmitted to the flywheel, the rotational movement of the flywheel is reduced. This is converted into a swinging motion of the moving tooth, whereby the moving tooth swings substantially in the front-rear direction with respect to the fixed tooth.

  A maintenance floor 21 is provided around the crushing device 20. The maintenance floor 21 is provided in the upper part of the main body frame 4 and has a portion extending in the front and rear sides of the left and right sides of the crushing device 20 and a left and right extending portion between the crushing device 20 and the power device 40. It is developed in a U shape with the opening facing backward in plan view. In the maintenance floor 21, rear end portions of the portions located on the left and right sides of the crushing device 20 extend to the vicinity of the grizzly feeder 15 and face the left and right of the front portion of the grizzly feeder 15. The front edge of the left and right wall surfaces of the hopper 12 has an upper edge formed obliquely so as to decrease in height toward the front, and when an operator goes back and forth between the maintenance floor 21 and the sieve member 17b. In addition, the hopper 12 does not become an obstacle. A safety fence 22 is installed at the edge on the maintenance floor 21. Note that a ladder 23 for ascending to the maintenance floor 21 is provided on at least one of the left and right side portions of the machine body. The ladder 23 rises from above the crawler belt 8 to the maintenance floor 21.

  The conveyor 25 includes a conveyor frame 26 suspended from the main body frame 4 and the like, driven wheels and driving wheels (both not shown) provided at both ends of the conveyor frame 26, a conveyor belt 29 wound around the driven wheels and the driving wheels, And a conveyor driving device (not shown) for rotating the driving wheel. When the driving wheels are rotationally driven by the conveyor driving device, the conveyor belt 29 wound around the driven wheels circulates and drives. The conveyor 25 extends forward from the lower position of the chute 11 (near the rear end of the crawler belt 8) between the left and right track frames 5 through the lower portion of the crushing device 20, and the lower position of the power device 40 (of the crawler belt 8). It bends in the vicinity of the front end) and rises obliquely, and extends to the vicinity of the entire height of the aircraft through the vicinity of the lower front end of the power unit 40 while maintaining the inclination angle.

  Above the conveyor 25, a magnetic separator 35 for removing magnetic foreign matters such as reinforcing bars in the crushed material to be discharged is provided. The magnetic separator 35 is suspended from an arm member 36 provided at the front portion of the power unit 40. The drive wheel and the driven wheel (both not shown) and the drive wheel and the driven wheel are wound around the conveyor 25. Magnetic separator belt 39 that circulates and drives in a direction (left-right direction) orthogonal to the extending direction of the magnet, and magnetic force generating means (not shown) provided in a space covered by magnetic separator belt 39 between the drive wheel and the driven wheel ).

  The power device 40 is supported by the upper part of the front side portion of the main body frame 4 and is located on the front side of the crushing device 20. Although not particularly illustrated, the power unit 40 controls the flow direction and flow rate of the engine serving as the power source of the jaw crusher, the hydraulic pump driven by the engine, and the pressure oil discharged from the hydraulic pump. And a control valve device for supplying to the corresponding hydraulic actuator.

  3 and 4 are side sectional views showing the internal structure of the crushing device 20. FIG. 3 shows a working state, and FIG. 4 shows a state where the moving teeth are retracted.

  3 and 4, the crushing device 20 includes a crushing device frame 41 fixed to the main body frame 4, a fixed tooth 42 fixed to the crushing device frame 41, a moving tooth 43 swinging with respect to the fixed tooth, and a moving tooth 43. A toggle plate 44 is provided to support the lower side.

  The fixed tooth 42 includes a support member 45 fixed to the crushing device frame 41 and a fixed tooth plate 42 a fixed to the front surface (moving tooth 43 side) of the support member 45. The moving teeth 43 are fixed to a surface of the crushing device frame 41 facing a swing jaw 48 swingably attached via an eccentric shaft 47 of a flywheel (not shown) and the fixed teeth 42 of the swing jaw 48. The movable tooth plate 43a is provided. The fixed teeth 42 and the moving teeth 43 are arranged to face each other so that the tooth plates 42a and 43a face each other, and a crushing chamber 49 that decreases in diameter downward is formed between the tooth plates 42a and 43a. The object to be crushed supplied to the crushing chamber 49 is crushed so as to be crushed by the fixed teeth 42 and the moving teeth 43 by the swinging movement of the moving teeth 43. The particle size of the crushed material discharged from the crushing device 20 is defined by the discharge opening of the crushing chamber 49, that is, the minimum gap (lower end gap) between the fixed tooth plate 42a and the movable tooth plate 43a. A cheek plate 41 a is replaceably attached to the crushing device frame 41, and the cheek plate 41 a constitutes the left and right side walls of the crushing chamber 49.

  Here, in the space on the opposite side (right side in FIG. 3) of the moving teeth 43 to the crushing chamber 49, for example, when the overload occurs due to the occurrence of foreign matter biting in the crushing chamber 49, the toggle plate 44, etc. An overload protection device 50 that protects these members from an excessive load is installed. This overload protection device 50 includes a jack 51 that retracts from the working state of FIG. 3 as shown in FIG. 4 and releases an excessive crushing reaction force when the crushing reaction force acting on the swing jaw 48 exceeds the set range. Yes.

  The jack 51 is fixed to the crushing device frame 41, and toggle sheets 53 and 54 are provided at the front end portion of the rod 52 of the jack 51 and the front lower portion of the swing jaw 48, respectively. The toggle sheets 53 and 54 are in contact with both ends of a toggle plate 44 interposed therebetween, and the lower end of the swing jaw 48 is jacked by a hydraulic cylinder 55 (see FIG. 4, not shown in FIG. 3). The toggle plate 44 is held between the toggle sheets 53 and 54 by being biased toward the 51 side. Both ends of the hydraulic cylinder 55 are rotatably connected to the lower part of the jack 51 and the vicinity of the lower end of the front surface of the swing jaw 48. In the present embodiment, the configuration in which the swing jaw 48 is urged toward the jack 51 by the hydraulic cylinder 55 is employed. However, the swing jaw 48 may be urged toward the jack 51 by a spring instead of the hydraulic cylinder 55. good.

  FIG. 5 is a side view of the grizzly feeder 15 in which the support member 13 is partially omitted.

  As described above, the grizzly feeder 15 includes the receiving plate 18 and the sieve members 17a and 17b. The receiving plate 18 is supported on a beam (not shown) extending to the left and right that is passed to the inside of the feeder main body 16, and is fixed to the feeder main body 16 so as to close the internal space in the latter half of the feeder 16. ing.

  The sieve members 17a and 17b are configured by arranging a plurality of grizzly bars in the machine body width direction (see also FIG. 2), and are installed in an inner space in the front half of the feeder body 16. The sieve member 17a is disposed on the front side of the backing plate 18, and the sieve member 17b is disposed on the front side of the sieve member 17a. These sieve members 17a and 17b are installed in the front-rear direction between the backing plate 18 and the crushing device 20. ing. Further, the upper surface of the front sieving member 17b is lower than the upper surface of the rear sieving member 17a, and the sieving members 17a and 17b are formed in a descending step shape toward the crushing device 20. In the present embodiment, the case of two stages in the front and rear is illustrated, but a configuration in which three or more stages are arranged in the front and rear direction may be employed.

  Further, the sieve members 17a and 17b at the respective stages have rotating shafts 61a and 61b extending in the left and right directions at the rear end portions serving as the base end portions. The rotary shafts 61a and 61b are supported by bearings 62a and 62b provided on the left and right outer wall portions of the feeder main body 16, whereby the base end portions are respectively supported by the feeder main body 16 via the rotary shafts 62a and 62b. Yes. At this time, fixed seats 63a and 63b are provided on the inner wall surfaces of the left and right side walls of the feeder body 16, and the sieve members 17a and 17b are seats provided on the lower surfaces of the respective front end portions (parts on the crushing device 20 side). The surfaces 64 a and 64 b are seated on the fixed seats 63 a and 63 b, respectively, so that the tips are held in a posture (hereinafter referred to as “working posture”) toward the inlet of the crushing device 20.

  In addition, brackets 66a and 66b are fixed to the front positions of the rotation shafts 61a and 61b on the left and right sides of the sieve members 17a and 17b via the shafts 65a and 65b extending to the left and right. The shafts 65 a and 65 b penetrate the left and right side walls of the feeder body 16, and the brackets 66 a and 66 b exist outside the feeder body 16. Although not shown in the drawings, the left and right side walls of the feeder main body 16 have arc-shaped elongated holes for allowing the shafts 65a and 65b to move when the sieve members 17a and 17b rotate around the rotation shafts 61a and 61b. Is provided. In addition, brackets 67a and 67b are provided on the left and right outer wall portions of the feeder body 16, and these brackets 67a and 67b are connected to the brackets 66a and 66b by driving devices 68a and 68b, respectively. The drive devices 68a and 68b of the present embodiment are hydraulic cylinders that are operated by pressure oil from a hydraulic pump (not shown) in the power unit 40, for example, but may be electric cylinders that are driven by a battery power source. . Also, a hydraulic or electric motor having an output shaft connected to the shafts 65a and 65b through a power transmission mechanism (coupling, gear, belt, etc.) as appropriate can be used.

  As shown in FIG. 5, the chute 11 described above has a posture in which the upper opening 11 a faces the sieve members 17 a and 17 b so that the upper opening 11 a is positioned below the sieve members 17 a and 17 b in the internal space of the feeder body 16. 16 and is reduced in diameter in the front-rear direction and the left-right direction toward the lower opening 11b. Below the lower opening 11b, the vicinity of the rear end of the conveying surface of the conveyor 25 is located.

  Next, the operation of the jaw crusher of the present embodiment having the above configuration will be described.

  When the object to be crushed is input by a hydraulic excavator or the like, the charged object to be crushed is guided onto the grizzly feeder 15 by the hopper 12. An object to be crushed on the receiving plate 18 that is vibrated together with the feeder main body 16 by the vibrator 19 is conveyed forward by vibration. When the object to be crushed moves on the sieve members 17a and 17b, fine particles (so-called slips, etc.) smaller than the selected particle size of the sieve members 17a and 17b fall from the gaps of the sieve members 17a and 17b, and the object to be crushed The material to be crushed having a particle size larger than the selected particle size moves forward on the sieve members 17a and 17b and is supplied to the crushing device 20. Fine particles separated from the material to be crushed by the sieve members 17 a and 17 b are guided to the vicinity of the rear end on the conveyor 25 through the chute 11. The object to be crushed supplied to the crushing device 20 is crushed to a predetermined particle size according to the exit gap between the fixed tooth 42 and the moving tooth 43. The crushed material discharged from the crushing apparatus 20 is guided onto the conveyor 25 and merges with the fine particles introduced through the chute 11, and is conveyed forward (right side in FIG. 1) by the conveyor 25 to the outside of the machine. Discharged.

  In addition, when magnetic foreign matters such as reinforcing bars are mixed in the crushed material or the like while being carried out by the conveyor 25, the magnetic foreign matter is adsorbed and removed by the magnetic separator 35. In the magnetic separator 35, magnetic foreign matter is adsorbed to the magnetic separator belt 39 by the magnetic force from the magnetic force generating means that acts on the crushed material on the conveyor 25 through the magnetic separator belt 39, and is circulated by the magnetic separator belt 39. A magnetic foreign material is conveyed to the side of the conveyor 25 and dropped.

  In the case of the present embodiment, for example, when the fine particles selected by the sieve members 17a and 17b are fixed and deposited on the inclined surface portion of the inner wall surface of the chute 11, the driving devices 68a and 68b are appropriately driven to sieve member 17a, It is possible to remove the fine particles attached to the chute 11 in a state where 17b is opened and the sieve member 17a or 17b is standing.

  For example, when cleaning the latter half of the wall surface constituting the chute 11, the operator stops the operation of the vibrator 19, the crushing device 20, the conveyor 25, etc. of the grizzly feeder 15, and the working posture (see FIG. 6). Then, the drive device 68a is driven to displace the rear sieve member 17a to a maintenance posture (see FIG. 7) opened upward. After displacing the sieve member 17a to the maintenance posture, turn off the engine and the electric system as they are, remove the key (not shown) from the engine key switch (not shown), carry the key, and use an appropriate shovel or bar. With a clean tool, the ladder 23 is raised from above the crawler belt 8, moved on the maintenance floor 21, and moved to the front sieve member 17b. Thus, the latter half of the chute 11 can be cleaned using the sieve member 17b as a scaffold.

  Thereafter, when the first half of the chute 11 is to be cleaned, the engine is started with the key that is carried, and if necessary, the sieve member 17a is shifted to the working position, and the driving device 68b is driven in the same procedure as described above to drive the front sieve member. 17b is opened upward (see FIG. 8). When the sieve member 17b is displaced to the maintenance posture, the engine and the electric system are cut off as they are, and the key is carried, and the ladder 23 is raised to the maintenance floor 21. Thereby, the front half portion of the chute 11 can be cleaned from the rear end portion of the maintenance floor 21.

  It should be noted that there is no restriction on the order of cleaning the first half part and the second half part of the chute 11, and it is naturally possible to perform only one of the cleaning procedures for the first half part and the second half part.

  According to the present embodiment, by opening the sieve members 17a and 17b one by one in this way, the chute 11 can be appropriately cleaned without being accessed from the lower side of the grizzly feeder 15, so that the workability of cleaning is improved. Is good. At this time, in this embodiment, each sieve member 17a, 17b is provided with shafts 61a, 61b at the rear end portions, and the front portions can be opened upward with the shafts 61a, 61b as fulcrums. Since the front portion of the grizzly feeder 15 is not blocked by the sieve member 17b, the work on the receiving member 18 is performed in advance when opening and closing the sieve members 17a and 17b as described above for the cleaning procedure of the chute 11 and the like. Even if the person does not move, after opening the sieve members 17a and 17b, the engine can be stopped and the chute 11 can be accessed without difficulty. Thus, after opening the sieve members 17a, 17b and stopping the engine, the space below the sieve members 17a, 17b of the grizzly feeder 15 can be accessed without difficulty, so even a single operator can safely clean the work. It can be performed.

  In addition, since the maintenance floor 21 faces the left and right sides of the front portion of the grizzly feeder 15, the operator can access the grizzly feeder 15 without using a ladder or building a bridge.

11 Chute 15 Grizzly feeder 16 Feeder body 17a, b Sieve member 18 Catch plate 20 Crushing device 21 Maintenance floor 25 Conveyor 41 Crushing device frame 42 Fixed tooth 43 Moving tooth 49 Crushing chamber 61a, b Rotating shaft 68a, b Drive device

Claims (3)

A crushing device frame, a fixed tooth fixed to the crushing device frame, and a crushing device including a moving tooth that forms a crushing chamber between the fixed tooth and swings with respect to the fixed tooth;
A grizzly feeder that is provided behind the crushing device and supplies the material to be crushed to the crushing device;
A jaw crusher provided with a maintenance floor provided around the crushing device,
The grizzly feeder is
The feeder body,
A backing plate fixed to the feeder body,
A plurality of stages are installed between the receiving plate and the crushing device in the front-rear direction, and each stage is supported by the feeder body via a rotating shaft that extends from the rear end to the left and right. A sieve member;
The plurality of sieving members and the feeder body are respectively connected, and the sieving members are rotated upward from the working posture in which the tip end opposite to the base end is directed to the crushing device. A jaw crusher comprising a plurality of drive devices that are displaced to a maintenance posture. The jaw crusher according to claim 1, wherein the maintenance floors located on the left and right sides of the crushing device face the left and right sides of the front portion of the grizzly feeder. A conveyor for carrying out the crushed material discharged from the crushing device;
The jaw crusher according to claim 1 or 2, further comprising a chute that is provided below the sieve member and guides the fine particles that have been sieved off by the sieve member onto the conveyor.

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