Crusher

Abstract

To provide a crusher that can attain strong crushing force and reduction in weight of the crusher simultaneously.SOLUTION: A crusher crushes by narrow pressure an object to be crushed by opening and closing a pair of crushing arms 20 using a pair of hydraulic cylinders 30. Each of the crushing arms 20 comprises a tip tooth 22 provided at a tip thereof and an intermediate tooth 23 provided between the tip and a base end. A maximum opening width Wtmax of the tip tooth 22 is in a range of 1087 mm or more and 1122 mm or less. A maximum opening width Wmmax of the intermediate tooth 23 is in a range of 757 mm or more and 780 mm or less. Crushing force generated on the tip tooth 22 in a state where an opening width of the tip tooth 22 is 900 mm is in a range of 92% or more and 93% or less of maximum crushing force generated on the tip tooth 22. Crushing force generated on the intermediate tooth 23 in a state where an opening width of the intermediate tooth 23 is 650 mm is in a range of 92% or more and 94% or less of maximum crushing force generated on the intermediate tooth 23.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a crusher that crushes an object to be crushed by clamping it with crushing arms that are pivotally supported on a frame and that are opened and closed by hydraulic cylinders. [Background technology]

[0002] BACKGROUND ART A crusher, which is a device for crushing objects to be crushed such as demolished buildings and crushed stones by clamping, is disclosed in Patent Document 1, for example. As shown in FIG. 4, the crusher 100 disclosed in Patent Document 1 crushes an object to be crushed by clamping it, by opening and closing a pair of crushing arms 120 pivotally supported on a frame 110 using a hydraulic cylinder 130. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-018364 Summary of the Invention [Problem to be solved by the invention]

[0004] The performance required of a crusher includes a strong crushing force, a large opening width for the crushing arms with a fast opening and closing speed, and high durability, but it is also very important that the machine is lightweight. In particular, when demolishing buildings in urban areas, as buildings become taller, pillar components are becoming larger while floor components are becoming lighter. As a result, the performance requirements for crushers are extremely strict, requiring them to achieve both crushing force and opening width while suppressing increases in the weight of the machine body.

[0005] Conventional crushers currently cannot adequately meet these extremely strict performance requirements. The present invention has been made in view of the above-mentioned problems, and has as its object to provide a crusher that can simultaneously achieve a powerful crushing force and a lightweight machine body. [Means for solving the problem]

[0006] A crusher according to one aspect of the present invention is a crusher that clamps and crushes an object to be crushed by opening and closing a pair of crushing arms pivotally supported on a frame using a pair of hydraulic cylinders. The crushing arms have distal teeth provided at their distal ends and intermediate teeth provided between their distal and proximal ends. The distal teeth have a maximum opening width ranging from 1087 mm to 1122 mm, and the intermediate teeth have a maximum opening width ranging from 757 mm to 780 mm. Furthermore, when the distal teeth have an opening width of 900 mm, the crushing force generated at the distal teeth is within a range of 92% to 93% of the maximum crushing force generated at the distal teeth, and when the intermediate teeth have an opening width of 650 mm, the crushing force generated at the intermediate teeth is within a range of 92% to 94% of the maximum crushing force generated at the intermediate teeth. [Effects of the Invention]

[0007] According to the present invention, the maximum opening width of the tip teeth is within the range of 1087 mm to 1122 mm, and the maximum opening width of the intermediate teeth is within the range of 757 mm to 780 mm. In addition, when the tip tooth opening width is set to 900 mm, the crushing force generated at the tip teeth is within the range of 92% to 93% of the maximum crushing force generated at the tip teeth, and when the intermediate tooth opening width is set to 650 mm, the crushing force generated at the intermediate teeth is within the range of 92% to 94% of the maximum crushing force generated at the intermediate teeth. This makes it possible to simultaneously achieve powerful crushing force and a lightweight machine, making it possible to provide a crusher that is particularly suitable for building demolition work in urban areas. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front view showing the configuration of the crusher of the present invention, showing the crushing arms in an open state. [Figure 2]FIG. 2 is a front view showing the configuration of the crusher of the present invention, showing the crushing arms in a closed state. [Figure 3] FIG. 10 is a graph showing the attenuation rate of crushing force. [Figure 4] FIG. 1 is a perspective view showing the configuration of a conventional crusher. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described below with reference to the drawings as appropriate. Note that the drawings are schematic. Therefore, it should be noted that the relationship between thickness and planar dimensions, ratios, etc. may differ from the actual ones, and the drawings may also include portions where the relationship between dimensions and ratios differ. Furthermore, the embodiments shown below are merely examples of devices and methods for embodying the technical concept of the present invention, and the technical concept of the present invention is not limited to the following embodiments in terms of the materials, shapes, structures, arrangements, etc. of the components.

[0010] (Embodiment) (composition) As shown in FIGS. 1 and 2, the crusher 1 includes a frame 10, a pair of crushing arms 20, and a pair of hydraulic cylinders 30.

[0011] A bracket 11 for mounting the crusher 1 on a vehicle such as a power shovel is provided at the upper end of the frame 10 via a swivel mechanism (not shown). The bracket 11 is also provided with a known speed-up circuit (high-speed valve, not shown).

[0012] A pair of crushing arms 20 are pivotally supported by arm pins 21 at the bottom of the frame 10 so as to be openable and closable. A hydraulic cylinder 30 is supported between the upper part of the frame 10 and the crushing arm 20, with a frame-side cylinder pin 31 and an arm-side cylinder pin 32 as support shafts.

[0013] The crushing arm 20 is provided with a tip tooth 22, an intermediate tooth 23, and a cutter 24 from the tip side to the base end (the arm pin 21 side) of the crushing arm 20. That is, the tip tooth 22 is provided at the tip of the crushing arm 20, and the intermediate tooth 23 is provided between the tip and base end of the crushing arm 20.

[0014] The hydraulic cylinder 30 is mounted between the crushing arms 20 and the frame 10. The pair of crushing arms 20 opens and closes as the hydraulic cylinder 30 extends and contracts.

[0015] <Various specifications> 1, the distance between the two end teeth 22 when the hydraulic cylinder 30 is fully retracted is defined as the end tooth maximum opening width Wtmax, and the distance between the two intermediate teeth 23 is defined as the intermediate tooth maximum opening width Wmmax. Furthermore, the distance between the end teeth 22 and the lower end surface of the frame 10 when the hydraulic cylinder 30 is fully retracted is defined as the pocket length L.

[0016] The relationship between the crushing force F generated by the pair of crushing arms 20 and the opening width W is as shown in FIG. 3 shows the tip tooth maximum crushing force Ftmax, which is the maximum value of the crushing force F generated at the tip tooth 22, and the intermediate tooth maximum crushing force Fmmax, which is the maximum value of the crushing force F generated at the intermediate tooth 23. Furthermore, in FIG. 3, the state in which the opening width of the tip tooth 22 is 900 mm is shown as "Wt900," and the crushing force F generated at the tip tooth 22 at Wt900 is shown as "Ft900." In addition, in FIG. 3, the state in which the opening width of the intermediate tooth 23 is 650 mm is shown as "Wm650," and the crushing force F generated at the intermediate tooth 23 at Wm650 is shown as "Fm650."

[0017] 3, the plotted dashed line Dt represents the attenuation rate characteristic of the crushing force F when the opening width decreases from the maximum value (Wtmax) at the tip tooth 22. Also, in FIG. 3, the plotted dashed line Dm represents the attenuation rate characteristic of the crushing force F when the opening width decreases from the maximum value (Wmmax) at the intermediate tooth 23. As shown in FIG. 3, the crushing force F generated by the pair of crushing arms 20 is maximum (Ftmax, Fmmax) at the maximum opening width (Wtmax, Wmmax), and the crushing force F decreases as the opening width decreases.

[0018] Table 1 shows the specifications of the crusher 1 of this embodiment, including the opening width and crushing force. 3, Table 1 shows the attenuation rate of the crushing force F generated in the tip tooth 22 when the opening width of the tip tooth 22 is reduced from the maximum value (Wtmax) to 900 mm (Wt900) as "attenuation rate δt900 for tip tooth opening width 900 mm." In addition, the attenuation rate of the crushing force F generated in the intermediate tooth 23 when the opening width of the intermediate tooth 23 is reduced from the maximum value (Wmmax) to 650 mm (Wm650) is shown as "attenuation rate δm650 for intermediate tooth opening width 650 mm." [Table 1]

[0019] As shown in Table 1 and Fig. 3, the crusher 1 of the present invention has a maximum opening width Wtmax of the tip teeth 22 set to 1100 mm. The reason for this is that the crushing target is a square pillar with a side length of 900 mm, which is the standard for building pillars in the metropolitan area. The attenuation rate δt900 of the tip teeth 22 is set to 92.6%, so it is possible to crush the crushing target (a square pillar with a side length of 900 mm) with ease. Similarly, in the crusher 1 of the present invention, the maximum opening width Wmmax of the intermediate teeth 23 is set to 765 mm. The reason for this is that the crushing target is set to a square pillar with a side length of 650 mm, which is the standard for building pillars in the metropolitan area. Furthermore, the attenuation rate δm650 of the intermediate teeth 23 is set to 93.0%, so it is possible to crush the crushing target (a square pillar with a side length of 650 mm) with ease.

[0020] Furthermore, the crusher 1 of the present invention has a maximum crushing force Ftmax of the end teeth 22 of 685 kN and a maximum crushing force Fmmax of the intermediate teeth 23 of 1138 kN, with particular emphasis placed on crushing force. Furthermore, the crusher 1 of the present invention has an attenuation rate δt900 of 92.6% and an attenuation rate δm650 of 93.0%, both of which are set to values ​​exceeding 92.5%, which clearly narrows the crushing target to the aforementioned square pillars with sides of 900 mm and square pillars with sides of 650 mm, making it suitable for crushing these objects.

[0021] <Crushing work> The crushing operation performed using the crusher 1 of the present invention will be described with reference to FIGS. First, a construction machine with a crusher 1 attached to the tip of its boom is advanced into the interior of the building to be demolished, and then placed on the floor of the building, and the boom is operated to position the crushing arm 20 facing the pillar to be crushed.

[0022] Then, the hydraulic cylinder 30 is shortened to open the pair of crushing arms 20, and the tip teeth 22 (or intermediate teeth 23) are brought close to or into contact with the pillar, and then the hydraulic cylinder 30 is extended to clamp and crush the pillar with the tip teeth 22 (or intermediate teeth 23). Table 2 shows a comparison between conventional models (model A, model B) and the crusher 1 of the present invention (the present invention) in the crusher lineup provided by the applicant. [Table 2]

[0023] As shown in Table 2, the crusher 1 of the present invention has a mass of 1510 kg. The crusher 1 of the present invention can achieve a maximum opening width (Wtmax, Wmmax) equivalent to that of model B, which has a crushing capacity one class higher, with a mass increase of only 30 kg compared to model A, which has a crushing capacity one class lower than model B. The square pillars with sides of 900 mm and square pillars with sides of 650 mm that are the target of crushing by the crusher 1 of the present invention are intended for building demolition work in urban areas, and as mentioned above, there are strict restrictions on the weight of the main body of the crusher 1 due to the strength of the building floors.

[0024] In other words, the crusher 1 of the present invention has crushing capabilities one class higher than the conventional model (model A), while successfully minimizing the increase in mass of the machine body, making it suitable for building demolition work in urban areas.

[0025] <Actions and Effects of the Embodiment> The crusher 1 of the embodiment can achieve the following actions and effects. (1) The crushing arm 20 has a tip tooth 22 provided at the tip and an intermediate tooth 23 provided between the tip and the base end. The maximum opening width of the tip tooth 22 is within a range of 1087 mm to 1122 mm, and the maximum opening width of the intermediate tooth 23 is within a range of 757 mm to 780 mm. Furthermore, when the opening width of the tip tooth 22 is set to 900 mm, the crushing force generated at the tip tooth 22 is within a range of 92% to 93% of the maximum crushing force generated at the tip tooth 22. Furthermore, when the opening width of the intermediate tooth 23 is set to 650 mm, the crushing force generated at the intermediate tooth 23 is within a range of 92% to 94% of the maximum crushing force generated at the intermediate tooth 23.

[0026] Therefore, the tip teeth 22 can crush square pillars, especially those with a side length of 900 mm, with ease and can exert a powerful crushing force. In addition, the intermediate teeth 23 can crush square pillars, especially those with a side length of 650 mm, with ease and can exert a powerful crushing force. As a result, it is possible to simultaneously achieve a powerful crushing force and a lightweight machine body without the need to increase the size of the crusher 1, making it possible to provide a crusher 1 that is particularly suitable for building demolition work in urban areas.

[0027] (2) The maximum opening width of the tip tooth 22 is 1100 mm, and when the opening width of the tip tooth 22 is 900 mm, the crushing force generated in the tip tooth 22 is 92.6% of the maximum crushing force generated in the tip tooth 22. As a result, the tip teeth 22 can crush the target object, particularly a square pillar with a side length of 900 mm, with ease and can exert a powerful crushing force.

[0028] (3) The maximum opening width of the intermediate tooth 23 is 765 mm, and when the opening width of the intermediate tooth 23 is 650 mm, the crushing force generated in the intermediate tooth 23 is 93.0% of the maximum crushing force generated in the intermediate tooth 23. As a result, the intermediate teeth 23 can crush the target object, particularly a square pillar with a side length of 650 mm, with ease and can exert a powerful crushing force.

[0029] (4) The mass is 1,510 kg or less. As a result, it is possible to simultaneously achieve a powerful crushing force and a lightweight machine body without the need to increase the size of the crusher 1.

[0030] The present technology can be configured as follows. (1) A crusher that crushes an object to be crushed by opening and closing a pair of crushing arms pivotally supported on a frame with a pair of hydraulic cylinders, The crushing arm includes a tip tooth provided at a tip end and an intermediate tooth provided between the tip end and a base end, The maximum opening width of the tip tooth is within the range of 1087 mm or more and 1122 mm or less, The maximum opening width of the intermediate tooth is within the range of 757 mm to 780 mm, The crushing force generated at the tip tooth when the opening width of the tip tooth is 900 mm is within a range of 92% to 93% of the maximum crushing force generated at the tip tooth, A crusher in which the crushing force generated at the intermediate teeth when the opening width of the intermediate teeth is 650 mm is within the range of 92% to 94% of the maximum crushing force generated at the intermediate teeth. (2) The maximum opening width of the tip teeth is 1100 mm; The crusher according to (1) above, wherein the crushing force generated at the tip teeth when the opening width of the tip teeth is set to 900 mm is 92.6% of the maximum crushing force generated at the tip teeth. (3) The maximum opening width of the intermediate teeth is 765 mm; A crusher as described in (1) or (2) above, wherein the crushing force generated at the intermediate teeth when the opening width of the intermediate teeth is 650 mm is 93.0% of the maximum crushing force generated at the intermediate teeth. (4) The crusher according to any one of (1) to (3) above, having a mass of 1510 kg or less. [Explanation of symbols]

[0031] 1 crusher 10 frames 11 Bracket 20 Crushing Arm 21 Armpin 22 apical tooth 23 Intermediate tooth 24 Cutter 30 Hydraulic cylinder 31 Frame side cylinder pin 32 Arm side cylinder pin 100 Crusher 110 frames 120 Crushing Arm 130 Hydraulic Cylinder Wt Tip tooth opening width Wtmax Maximum opening width of tip teeth Wm Intermediate tooth opening width Wmmax Maximum opening width of intermediate teeth Ft Tip tooth crushing force Ftmax Maximum crushing force of tip teeth Fm Intermediate tooth crushing force Fmmax Intermediate tooth maximum crushing force L Pocket length

Claims

1. A crusher that crushes an object to be crushed by opening and closing a pair of crushing arms pivotally supported on a frame with a pair of hydraulic cylinders, The crushing arm includes a tip tooth provided at a tip end and an intermediate tooth provided between the tip end and a base end, The maximum opening width of the tip tooth is within a range of 1087 mm or more and 1122 mm or less, The maximum opening width of the intermediate tooth is within a range of 757 mm to 780 mm, The crushing force generated at the tip tooth when the opening width of the tip tooth is 900 mm is within a range of 92% to 93% of the maximum crushing force generated at the tip tooth, A crusher in which the crushing force generated at the intermediate teeth when the opening width of the intermediate teeth is 650 mm is within the range of 92% to 94% of the maximum crushing force generated at the intermediate teeth.

2. The maximum opening width of the tip tooth is 1100 mm, 2. The crusher according to claim 1, wherein the crushing force generated at the tip teeth when the opening width of the tip teeth is set to 900 mm is 92.6% of the maximum crushing force generated at the tip teeth.

3. The maximum opening width of the intermediate teeth is 765 mm; 2. The crusher according to claim 1, wherein the crushing force generated at the intermediate teeth when the opening width of the intermediate teeth is set to 650 mm is 93.0% of the maximum crushing force generated at the intermediate teeth.

4. 2. The crusher according to claim 1, having a mass of 1510 kg or less.

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