JPH0518650U - Jiyo crush - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a jaw crusher which can be operated safely and which has a small fluctuation in hydraulic pressure and can be downsized in a hydraulic system. [Structure] A hydraulic pressure in which a clutch 7 that functions as a torque limiter is interposed between an eccentric shaft 6 that drives and drives an upper portion of a swing jaw 3 and a flywheel 5, and that supports a lower end of the swing jaw 3. An accumulator for adjusting the hydraulic pressure of the cylinder 8 is provided, the hydraulic pressure that is the crushing force is adjusted by the accumulator, and when the crushing is impossible, the swing jaw 3 is retracted by the hydraulic cylinder 8 and the outlet 4b of the crushing chamber 4 is expanded. Safely drop and discharge crushed objects that cannot be crushed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joke crusher for crushing an object to be crushed by cooperation of a fixed jaw and a swing jaw.

[0002]

[Prior Art]

 Conventionally, the jaw crusher is pivotally supported on the frame by a fixed jaw fixedly provided on the frame, and an eccentric shaft whose upper end faces the fixed jaw and is rotationally driven, and the lower end is provided on the frame. There is a crushing chamber equipped with a swing jaw supported by a hydraulic cylinder via a toggle block and a toggle plate, and a crushed material, such as rough stone, is introduced through a supply port opening upward.

A rough stone put into the crushing chamber is swung with a lower end supported by a hydraulic cylinder via a toggle block and a toggle plate as a center, as the eccentric shaft is driven to rotate. It is crushed by the cooperation of the jaw and the fixed jaw, and is discharged as a crushed material of a predetermined size by dropping from the outlet opening downward.

[0004]

[Problems to be solved by the device]

 According to the jaw crusher described above, the rough stones put into the crushing chamber are crushed by the cooperation of the swing jaw and the fixed jaw. When the crushed material is thrown into the crushing chamber, the material to be crushed must be lifted and removed from the supply port by a crane, etc. This removal work is not only dangerous work but also dangerous, and the toggle plate and toggle Since an excessive force acts on the hydraulic cylinder via the lock, the hydraulic pressure fluctuates, and there is a problem that the hydraulic system including the hydraulic cylinder has a large capacity, and hence the size becomes large.

Therefore, an object of the present invention is to provide a jaw crusher which can be operated safely and which has a small fluctuation of hydraulic pressure and which can reduce the size of a hydraulic device.

[0006]

[Means for Solving the Problems]

 A jaw crusher according to the present invention which achieves the above object is provided with a fixed jaw provided on a frame, an upper end pivotally supported by an eccentric shaft driven by a flywheel rotated by a rotary drive, and a lower end supported by a toggle plate. And a swinging jaw having a swinging jaw supported by a hydraulic cylinder supported by a frame via a toggle block, and an object to be crushed which is put into the crushing chamber from above is provided with a fixed jaw and a swinging jaw. In a jaw crusher that crushes by action and discharges downwards, a hydraulic pressure that includes a hydraulic cylinder and a clutch that acts as a torque limiter that does not transmit a torque greater than a predetermined amount, is interposed between the flywheel and the eccentric shaft. And an accumulator provided in the circuit for adjusting the hydraulic pressure of the hydraulic cylinder.

[0007]

【Example】

 An embodiment of the jaw crusher of the present invention will be described with reference to FIGS. 1 to 3 by taking as an example the case where a raw stone is crushed as a material to be crushed and a crushed stone is processed and produced.

FIG. 1 is a side view of a main part of the jaw crusher, and reference numeral 1 is a frame. The frame 1 is provided with a fixed jaw 2 and a swing jaw 3 which are fixedly provided so as to face each other, thereby forming a crushing chamber 4. The rough stone w introduced into the crushing chamber 4 through the supply port 4a opening upward is crushed by the cooperation of the fixed jaw 2 and the swing jaw 3. Inside the fixed jaws 2 and the swing jaws 3, the fixed jaws 2 and the swing jaws 3 are protected from the impact due to the input of the rough stones, and the crushed stones produced by crushing the raw stones are smoothly dropped and discharged from the outlet 4b. The tooth plates 2a and 3a are stretched.

An upper end of the swing jaw 3 is pivotally supported by an eccentric shaft 6 which is rotationally driven by a rotary drive device, for example, an electric motor (not shown) via a flywheel 5, and the frame 1 is supported by the eccentric shaft 6. Supported by.

The end of the eccentric shaft 6 and the flywheel 5 are connected via a clutch 7 that functions as a torque limiter. The clutch 7 has an end that is shown in FIG. Is fixed to the end portion of the eccentric shaft 6 and the hat-shaped support plate 7a that is slidably abutted on the inner side surface 5b and the inner peripheral surface 5c of the boss 5a of the flywheel 5 and is rotatably fitted. Then, a pressure contact plate 7c that abuts via the friction plate 7b is provided on the outer side surface 5d of the boss 5a of the flywheel 5, and the pressure contact plate 7c is pressed via the spacer 7b by the clutch spring 7d that is a coil spring. The boss 5a is configured to be sandwiched by the support plate 7a and the pressure contact plate 7c at a predetermined pressure, and only torque within a predetermined range is transmitted between the flywheel 5 and the eccentric shaft 6. It has become.

A lower end of the swing jaw 3 is interposed between a hydraulic cylinder 8 provided in the frame 1, a toggle block 10 reciprocating in a box 9 by a hydraulic cylinder 8 and a toggle block 10 and a lower end of the swing jaw 3. It is supported by the frame 1 via a toggle plate 11.

Further, the lower end of the swing jaw 3 is constantly urged by a tension rod 13 pulled by a spring 13a in a direction to open the outlet 4b, and the swing jaw 3 is reciprocally moved by a hydraulic cylinder 8 and a toggle block 10 and It smoothly follows the movement of the toggle plate 11.

As shown in FIG. 3, the hydraulic circuit 14 for driving and controlling the hydraulic cylinder 8 selectively switches operating oil supplied from a oil tank 14a by a pump 14b driven by a motor by a solenoid valve 14c. It is supplied to the hydraulic cylinder 8, and the hydraulic cylinder 8 is expanded and contracted to swing the lower end of the swing jaw 3. The swinging position of the swing jaw 3 is made by controlling the solenoid valve 14c by a proximity switch (not shown) provided at a predetermined position, and the hydraulic pressure supplied to the hydraulic cylinder 8 is controlled by the accumulator 14d.

An electric motor (not shown) that rotationally drives the flywheel 5 has a breaking device such as a meter relay (not shown) that shuts off the current when an overload current of a predetermined value or more acts on the motor. An electric circuit is provided.

In the jaw crusher configured as described above, the size of the crushed stone becomes the width of the outlet 4b by replacing the shim plate 12 interposed between the toggle block 10 and the box 9. It is determined by adjusting the distance between the lower ends of the swing jaw 3 and the swing jaw 3.

Next, the operation of the jaw crusher configured as described above will be described.

In a normal operation state in which the flywheel 5 is rotationally driven by the electric motor, the solenoid valve 14c of the hydraulic circuit for operating the hydraulic cylinder 8 is positioned as shown in FIG. 1. The lower end of the swing jaw 3 is located at the position indicated by the solid line in FIG. 1, and the rough stone put into the crushing chamber 4 from the supply port 4a by the cooperation of the fixed jaw 2 and the swing jaw 3 swinging by the rotation of the eccentric shaft 6. Is crushed by a crushing force within a range that does not exceed the pressing force of the hydraulic cylinder 8 held at a constant pressure by the accumulator 14d. The rough stone crushed to a size corresponding to the width of the outlet 4b is dropped and discharged from the outlet 4b as crushed stone.

When a large rough stone w or a large amount of rough stone w that cannot be crushed by the crushing force in the above-described normal operating state is input, the reaction force of the swing jaw 3 that crushes the object to be crushed becomes large. Then, a force for compressing the hydraulic cylinder 8 acts on the hydraulic cylinder 8 via the swing jaw 3. As a result, the hydraulic pressure in the hydraulic cylinder 8 is increased, the pressure in the accumulator 14d in the hydraulic circuit is gradually increased, and the pressing force of the hydraulic cylinder 8 for pressing the swing jaw 3 is also gradually increased to be increased with the fixed jaw 2. The rough w is crushed by the great crushing force with the swing jaw 3, and the crushing work is continued.

However, when a larger rough stone w or a large amount of rough stone w or an iron piece that cannot be crushed by the crushing force between the swing jaw 3 and the fixed jaw 2 thus increased is thrown in, the electric motor The flywheel 5, which is rotationally driven by the clutch 7, and the crushing force by the swing jaw 3, which is driven through the eccentric shaft 6, and the pressing force on the swing jaw 3, which is caused by the accumulator, gradually increase, but the flywheel 5 When the torque transmitted to the eccentric shaft 6 by the clutch reaches a predetermined value, the boss 5a of the flywheel 5 is sandwiched between the support plate 7a of the clutch 7 and the press plate 7c and the boss 5a. Sliding to limit the driving force applied to the eccentric shaft 6 by the flywheel 5. Therefore, the crushing force by the swing jaw 3 is also limited.

When an overload current such that the driving force applied to the eccentric shaft 6 by the flywheel 5 is limited by the clutch 7 acts on the motor, the meter relay serving as the breaking device operates to cut off the current. The electric motor that rotationally drives the flywheel 5 stops, and the jaw crusher stops safely with the crushing force limited.

Next, the solenoid valve 14 c of the hydraulic circuit is switched, the hydraulic cylinder 8 is contracted, the swing jaw 3 is retracted as shown by the one-dot chain line 3 ′ in FIG. 1, and it is determined by the distance between the lower ends of the fixed jaw 2 and the swing jaw 3. The width of the exit 4b is widened, and uncrushable rough stones are dropped and discharged.

[0022]

[Effect of the device]

 According to the jaw crusher of the present invention, a clutch that functions as a torque limiter is interposed between an eccentric shaft that supports the upper portion of the swing jaw and drives the swing eccentric shaft and a flywheel that rotationally drives the eccentric shaft. Moreover, since an accumulator that adjusts the hydraulic pressure of the hydraulic cylinder that supports the lower end of the swing jaw is provided, a constant crushing force can be obtained in normal times, and when a large amount of crushed objects or hard crushed objects are input. A high crushing force is obtained, and when a large amount of crushed objects or even harder crushed objects are input, the clutch does not generate a crushing force higher than a predetermined value on the swing jaws. Does not become high pressure, and it becomes possible to downsize the hydraulic system including the hydraulic cylinder. Also, by expanding and contracting the swing jaws and expanding the outlet by expanding and contracting the hydraulic cylinder, it is possible to easily remove the crushable objects by dropping and discharging the crushable objects that cannot be crushed. The effect is great.

[Brief description of drawings]

FIG. 1 is a side view of essential parts showing an embodiment of a jaw crusher of the present invention.

FIG. 2 is a cross-sectional view of essential parts showing a clutch used in the embodiment.

FIG. 3 is an explanatory diagram of a hydraulic circuit used in the same embodiment.

[Explanation of symbols]

 1 ... Frame 2 ... Fixed jaw 3 ... Swing jaw 4 ... Crushing chamber 5 ... Flywheel 6 ... Eccentric shaft 7 ... Clutch 8 ... Hydraulic cylinder 10 ... Toggle block 11 ... Toggle plate 14 ... Hydraulic circuit 14d ... Accumulator

Claims (3)

[Scope of utility model registration request] 1. A fixed jaw provided on a frame, an upper end of which is pivotally supported by an eccentric shaft which is rotationally driven by a flywheel rotated by a rotary drive device, and a lower end of which is supported by the frame via a toggle plate and a toggle block. Jaw crusher having a crushing chamber having a swing jaw supported by a fixed hydraulic cylinder and crushing an object to be crushed introduced into the crushing chamber from above by the cooperation of the fixed jaw and the swing jaw and discharging the jaw crusher downward. In an accumulator, which is provided between the flywheel and an eccentric shaft and which functions as a torque limiter that does not transmit a torque greater than a predetermined value, and a hydraulic circuit including a hydraulic cylinder, and which adjusts the hydraulic pressure of the hydraulic cylinder. A jaw crusher characterized by having and. 2. The jaw crusher according to claim 1, wherein the lower end of the swing jaw is swingable by expansion and contraction of a hydraulic cylinder. 3. A rotary drive device for rotationally driving a flywheel is an electric motor, and has a shutoff device for shutting off the electric motor and stopping the electric motor when an overload current of a predetermined amount or more acts on the electric motor. Item 1 or 2 jaw crusher.