阅读说明：本技术 摇臂动力驱动的摆动式破碎机构 (Swing type crushing mechanism driven by rocker arm power ) 是由 章立强 贠瑞光 董超 王振乾 陈峤鹰 胡滔 胡璟 宋振 陈虎 吴振毅 吕晓 顾 于 2021-03-22 设计创作，主要内容包括：本发明涉及一种摇臂动力驱动的摆动式破碎机构,其摆动臂包括摆动臂壳体、回转轴和连接轴,摆动臂壳体的一端设有前后延伸的管状结构,回转轴旋转支撑在管状结构的内腔,摆动臂壳体包括主壳体和后臂架,主壳体的前部、管状结构的旁侧设有前臂架,前臂架的内腔与管状结构的前部内腔相通,后臂架固定连接在主壳体上,并与前臂架前后相对,连接轴的前后两端分别旋转支撑在前、后臂架上,回转轴的前部通过位于前臂架的内腔中的传动系统与连接轴的前部传动连接,连接轴上固定安装有破碎齿。本发明能用于较薄矿层或高品位薄矿层开采用的采矿机上,对大块度岩块进行有效破碎,使岩块能够顺利地从采矿机摇臂下方通过,避免堆积。(The invention relates to a swing type crushing mechanism driven by rocker arm power, wherein a swing arm comprises a swing arm shell, a rotating shaft and a connecting shaft, one end of the swing arm shell is provided with a tubular structure extending forwards and backwards, the rotating shaft is rotatably supported in an inner cavity of the tubular structure, the swing arm shell comprises a main shell and a rear arm frame, a front arm frame is arranged at the front part of the main shell and beside the tubular structure, the inner cavity of the front arm frame is communicated with the inner cavity of the front part of the tubular structure, the rear arm frame is fixedly connected to the main shell and is opposite to the front and rear parts of the front arm frame, the front end and the rear end of the connecting shaft are respectively rotatably supported on the front arm frame and the rear arm frame, the front part of the rotating shaft is. The rock breaking device can be used on a mining machine for mining a thin ore layer or a high-grade thin ore layer, and can effectively break large-lumpiness rock blocks, so that the rock blocks can smoothly pass through the lower part of a rocker arm of the mining machine, and accumulation is avoided.)

1. The utility model provides a rocking arm power driven swing type crushing mechanism which characterized in that: comprises a swinging arm, the swinging arm comprises a swinging arm shell, a rotating shaft and a connecting shaft, one end of the swinging arm shell is provided with a tubular structure extending forwards and backwards, the rotating shaft is arranged in the inner cavity of the tubular structure, the front end and the rear end of the rotating shaft are respectively and rotatably supported at the front end and the rear end of the inner cavity of the tubular structure, the swing arm shell comprises a main shell and a rear arm frame, a front arm frame is arranged at the front part of the main shell and beside the tubular structure, the inner cavity of the front arm frame is communicated with the inner cavity at the front part of the tubular structure, the rear arm frame is fixedly connected on the main shell, and is opposite to the front arm support and the rear arm support, the front end and the rear end of the connecting shaft are respectively supported on the front arm support and the rear arm support in a rotating way, the crushing teeth are fixedly mounted on the connecting shaft, the front part of the rotating shaft is in transmission connection with the front part of the connecting shaft through a transmission system located in an inner cavity of the front arm support, and the front end of the rotating shaft is a power input end.

2. The swing arm power driven crushing mechanism of claim 1 further comprising: the front part of the rotating shaft is provided with an external gear, the front part of the connecting shaft is provided with an external spline, the transmission system is a fixed shaft gear transmission system, a first gear of the fixed shaft gear transmission system is externally meshed with the external gear on the rotating shaft according to the transmission direction, and a last gear of the fixed shaft gear transmission system is sleeved on the connecting shaft and connected with the front spline of the connecting shaft.

3. The swing arm power driven crushing mechanism of claim 2 further comprising: still include fixing base and hydro-cylinder, the fixing base is C shape structure, relative preceding supporting arm and back supporting arm around being equipped with on it, the swing arm casing with tubular structure articulates for the level around the axle on the fixing base, both ends support respectively on preceding supporting arm and back supporting arm around the tubular structure, the one end of hydro-cylinder articulates on the fixing base, the other end articulates on the swing arm casing.

4. The swing arm power driven crushing mechanism of claim 3 further comprising: a plurality of shaft sleeves are sleeved and fixed outside the connecting shaft side by side, and a plurality of crushing teeth are fixedly installed on each shaft sleeve.

5. The swing arm power driven crushing mechanism of claim 3 or 4 further comprising: the mining machine rocker arm is characterized by further comprising a mining machine rocker arm, a shell of the mining machine rocker arm is an L-shaped structural unit comprising a cylinder body and an arm support, the cylinder body extends forwards and backwards, the arm support extends leftwards and rightwards, the cylinder body is located behind one end of the arm support, an assembly body consisting of a fixing seat, a swing arm and an oil cylinder is mounted on the inner side of a corner of the L shape, the fixing seat is fixedly connected to the cylinder body, the front portion of the tubular structure is connected with the rear portion of the arm support in a positioning mode through a circular spigot structure, the circular spigot structure is coaxial with a rotary shaft, and the front end of the rotary shaft is coaxially connected with the.

6. The swing arm power driven crushing mechanism of claim 5 further comprising: the rear end of the gear shaft of the transmission gear and the front end of the revolving shaft are respectively provided with an internal spline, and the gear shaft of the transmission gear and the revolving shaft are simultaneously connected with the front spline and the rear spline of one spline shaft.

7. The swing arm power driven crushing mechanism of claim 6 further comprising: the front end of the rotating shaft is sleeved with a front end cover in the radial direction, the rear part of the front end cover is embedded and fixed in the tubular structure, the rear end of a gear shaft of the transmission gear is sleeved with a rear end cover in the radial direction, the front part of the rear end cover is embedded and fixed on the arm support, and the front end cover and the rear end cover are connected in an axial and radial positioning mode through a circular spigot structure.

8. The swing arm power driven crushing mechanism of claim 7 further comprising: and a radial seal is arranged between the front end cover and the rear end cover.

9. The swing arm power driven oscillating crushing mechanism of claim 1, 2, 3, 4, 5, 6, 7 or 8 further characterized by: the crushing tooth grinding machine is characterized by further comprising a mechanical protection structure, wherein the mechanical protection structure comprises a support and a plurality of rollers mounted on the support, the support is fixed on the front arm support, the axes of the rollers horizontally extend forwards and backwards, the rollers are arranged in an arc-shaped area with the axis of the connecting shaft as the axis at intervals in the circumferential direction, the arc-shaped area is lower than the axis of the connecting shaft, and the farthest distance from the edge of each roller to the axis of the connecting shaft is larger than the radius of a cutting circle of each crushing tooth.

10. The swing arm power driven crushing mechanism of claim 9 further comprising: the main casing body is provided with a shield, and the shield is covered above the connecting shaft.

Technical Field

The invention relates to a crushing mechanism for a mining machine, in particular to an bauxite mining machine which is suitable for mining a thinner ore layer or a high-grade thin ore layer.

Background

In order to adapt to mining of a thinner ore layer or a high-grade thin ore layer, a rocker arm of a high-power (high-torque) cutting system is generally adopted on an bauxite mining machine, the rocker arm is low in height, compact in structure and high in power density, and a cutting motor arranged in a rocker arm shell occupies a large space in the front-rear direction, so that a conventional crushing device is not arranged in a space between the cutting motor and a cable trough. However, in the actual exploitation of the mining machine, a large amount of high-hardness bauxite often can appear, and these bauxite need pass through below the position where the cutting motor of rocking arm is located after entering the conveyer, but a lot of rocks are massive rocks, can not pass through, finally pile up and lead to the conveyer can't carry, need to shut down and carry out artifical clearance, waste time and energy, still influence the productivity.

Disclosure of Invention

The invention aims to provide a swing type crushing mechanism driven by rocker arm power, which can be used on a mining machine for mining a thin ore layer or a high-grade thin ore layer to effectively crush large-lumpiness rock blocks, so that the rock blocks can smoothly pass through the lower part of a rocker arm of the mining machine, and the rock blocks are prevented from being accumulated.

The main technical scheme of the invention is as follows:

the utility model provides a rocking arm power driven oscillating crushing mechanism, includes the swing arm, the swing arm includes swing arm casing, revolving axle and connecting axle, the tubular structure that extends around the one end of swing arm casing is equipped with, the revolving axle sets up the inner chamber at tubular structure, and both ends are rotatory respectively to be supported around the revolving axle both ends around the inner chamber of tubular structure, swing arm casing includes main casing and back cantilever crane, and the front portion of main casing, tubular structure's side are equipped with preceding cantilever crane, and the inner chamber of preceding cantilever crane communicates with each other with the anterior inner chamber of tubular structure, back cantilever crane fixed connection is on the main casing, and with it is relative around the preceding cantilever crane, both ends are rotatory respectively to be supported on preceding cantilever crane and back cantilever crane around the connecting axle, fixed mounting has broken tooth on the connecting axle, the anterior transmission system through being located the inner chamber of preceding cantilever crane is connected with the, the front end of the rotating shaft is a power input end.

The front part of the rotating shaft can be provided with an external gear, the front part of the connecting shaft can be provided with an external spline, the transmission system is a fixed shaft gear transmission system, a first gear of the fixed shaft gear transmission system is externally meshed with the external gear on the rotating shaft according to the transmission direction, and a last gear of the fixed shaft gear transmission system is sleeved on the connecting shaft and connected with the front spline of the connecting shaft.

Rocking arm power drive's broken mechanism of oscillating can also include fixing base and hydro-cylinder, the fixing base is C shape structure, relative preceding supporting arm and back supporting arm around being equipped with on it, the swing arm casing with tubular structure articulates for the axle front and back level on the fixing base, both ends support respectively on preceding supporting arm and back supporting arm around the tubular structure, the one end of hydro-cylinder articulates on the fixing base, and the other end articulates on the swing arm casing.

A plurality of shaft sleeves are preferably sleeved and fixed on the outside of the connecting shaft side by side, and a plurality of crushing teeth are fixedly arranged on each shaft sleeve.

The swing type crushing mechanism driven by the rocker arm power further comprises a mining machine rocker arm, a shell of the mining machine rocker arm is an L-shaped structural unit comprising a barrel and an arm support, the barrel extends forwards and backwards, the arm support extends leftwards and rightwards, the barrel is located behind one end of the arm support, an assembly body composed of a fixed seat, a swing arm and an oil cylinder is installed on the inner side of a corner of the L shape, the fixed seat is fixedly connected to the barrel, the front portion of the tubular structure is connected with the rear portion of the arm support in a positioning mode through a circular spigot structure, the circular spigot structure is coaxial with a rotary shaft, and the front end of the rotary shaft is coaxially connected with the rear end of a gear shaft of a transmission.

The rear end of the gear shaft of the transmission gear and the front end of the revolving shaft are respectively provided with an internal spline, and the gear shaft of the transmission gear and the revolving shaft are simultaneously connected with the front spline and the rear spline of one spline shaft.

The swing type crushing mechanism driven by the rocker arm power preferably further comprises a mechanical protection structure, the mechanical protection structure comprises a support and a plurality of rollers mounted on the support, the support is fixed on the front arm support, the axes of the rollers horizontally extend forwards and backwards, the rollers are arranged in an arc-shaped area with the axis of the connecting shaft as the axis at intervals in the circumferential direction, the position of the arc-shaped area is lower than the axis of the connecting shaft, and the farthest distance from the edge of each roller to the axis of the connecting shaft is greater than the radius of a cutting circle of each crushing tooth.

The invention has the beneficial effects that:

a power device is not arranged on the swing arm serving as the main body of the crushing mechanism, and only a power input end is arranged, so that the volume of the swing arm is greatly reduced, especially the space occupation in the front-back direction is reduced, and the swing arm can be applied to a low-fuselage mining machine. And the structure of the swing arm itself becomes simple.

Because the structure of the connecting shaft and the crushing teeth replaces the traditional crushing roller, the structure of the crushing part becomes very simple, and the manufacturing cost and the use cost are lower.

Because the crushing teeth and the corresponding shaft sleeves with different parameters are arranged at different positions in the front and back of the connecting shaft according to the actual distribution characteristics of the lumpiness of the rock blocks on the conveying groove of the conveyor in the front and back directions, the rock blocks can be crushed more pertinently, and a better crushing effect can be achieved with more reasonable investment.

Because a drive gear of the mining machine cutting drive system is used as a power device to provide power for the swing arm, the swing arm is arranged on the inner side of the L-shaped corner of the mining machine swing arm, so that the mounting space is saved, and the problem of a power source is solved, and a crushing mechanism can be arranged on a mining machine for mining a thin ore layer or a high-grade thin ore layer, thereby effectively crushing large-block rock blocks, enabling the rock blocks to smoothly pass through the lower part of the mining machine swing arm and avoiding accumulation.

The transmission from the cutting transmission system to the transmission system of the swing arm is connected through the spline shaft, so that overload protection is realized, the transmission stability is improved, and the floating connection of the spline can improve the alignment between the swing arm shell and the transmission gear, so that the transmission stability is improved.

Due to the fact that the mechanical protection structure is arranged, when the swing arm swings downwards, the mechanical protection structure can be in contact with the top surface of the ledge on the front side of the conveyor firstly, the lowest height of the crushing teeth is limited, and the crushing teeth are prevented from damaging the conveyor located right below the crushing teeth.

Drawings

FIG. 1 is a front view of one embodiment of the present invention;

FIG. 2 is a cross-sectional view of the embodiment of FIG. 1;

FIG. 3 is a schematic structural diagram of an assembly composed of the fixed seat, the swing arm and the oil cylinder;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

FIG. 5 is a partial schematic structural view of the mining machine swing arm of FIG. 2;

FIG. 6 is a schematic view of the swing arm in a down swing position when the mining machine is cutting the upper cutter;

fig. 7 is a schematic diagram of the swinging arm swinging up when the mining machine rocker arm cuts the lower cutter.

Reference numerals:

1. a swing arm; 11. a fixed seat; 111. an end plate; 112. a pin; 113. a hinged seat; 114. a front wear-resistant sleeve; 115. a rear wear-resistant sleeve; 12. a swing arm housing; 121. a front arm support; 122. a rear arm support; 123. a hinged seat; 124. a transmission system; 1241. a rotating shaft; 1242. a connecting shaft; 125. crushing teeth; 126. a shield; 127. a tubular structure; 13. an oil cylinder; 14. a mechanical protective structure;

2. a mining machine rocker arm; 21. a barrel; 211. shallow-groove; 212. a pin hole; 22. a transmission gear; 221. an internal spline;

3. a spline shaft;

91. a lower seam; 92. the upper seam.

Detailed Description

The invention discloses a swing type crushing mechanism driven by rocker power, which comprises a swing arm 1 as shown in figures 1-7, wherein the swing arm comprises a swing arm shell 12, a rotating shaft 1241 and a connecting shaft 1242. One end of the swing arm housing is provided with a tubular structure 127 extending back and forth around which the swing arm will swing. The rotary shaft is arranged in the inner cavity of the tubular structure, and the front end and the rear end of the rotary shaft are respectively and rotatably supported at the front end and the rear end of the inner cavity of the tubular structure through bearings. The swing arm housing comprises a main housing and a rear arm support 122, the tubular structure is a part of the main housing, a long and narrow front arm support 121 extending left and right is arranged at the front part of the main housing and the side of the tubular structure, and the inner cavity of the front arm support is communicated with the inner cavity of the front part of the tubular structure. The rear arm support is fixedly connected to the main shell and is opposite to the front arm support in the front-back direction. The front end and the rear end of the connecting shaft are respectively and rotatably supported on the front arm support and the rear arm support, and the connecting shaft and the rotating shaft are parallel and far away from the rotating shaft. The connecting shaft is fixedly provided with crushing teeth 125. The front part of the rotating shaft is in transmission connection with the front part of the connecting shaft through a transmission system 124 positioned in the inner cavity of the front arm support. The front end of the rotating shaft is a power input end, external power is input from the rotating shaft and is transmitted to the connecting shaft through the transmission system, so that the connecting shaft is fixed to rotate, the crushing teeth rotate along with the connecting shaft, and the rock is crushed. And the front end of the rotating shaft is provided with a power input interface structure.

The front end of the revolving shaft is used as a power input end, an interface structure is provided for introducing power from a cutting transmission system of a mining machine rocker arm, so that a corresponding swing type crushing mechanism does not need to be separately matched with a motor or a hydraulic motor and other power devices, the front and back size of the crushing mechanism is greatly shortened compared with the structure that the existing power device is axially and sequentially connected with a crusher roller, and compared with the structure that the existing power device is arranged in the crusher roller, the left and right and up and down sizes of the crushing mechanism corresponding to the traditional crusher roller are also correspondingly reduced, so that the structure of the invention is more compact, and the invention can be applied to a mining machine for mining a thinner ore layer or a high-grade thin ore layer. Moreover, the structure of the connecting shaft and the crushing teeth replaces the traditional crushing roller, so that the structure is very simple, and the manufacturing cost and the use cost are lower.

The front part of the rotating shaft is provided with an external gear, the front part of the connecting shaft is provided with an external spline, the front end and the rear end of the external spline on the connecting shaft are rotatably supported on the front side wall and the rear side wall of the front arm support, the transmission system 124 is a fixed shaft gear transmission system, a first gear of the fixed shaft gear transmission system is externally engaged with the external gear on the rotating shaft according to the transmission direction, and a last gear of the fixed shaft gear transmission system is sleeved on the connecting shaft and is connected with the front.

The swing type crushing mechanism driven by the rocker arm power further comprises a fixed seat 11 and an oil cylinder 13. The fixing seat is of a C-shaped structure, and a front supporting arm and a rear supporting arm which are opposite to each other in the front-rear direction are arranged on the fixing seat. The swing arm shell is horizontally hinged to the fixed seat from front to back by taking the tubular structure as a shaft, and the front end and the rear end of the tubular structure are respectively supported on the front supporting arm and the rear supporting arm. One end of the oil cylinder is hinged to the fixed seat, and the other end of the oil cylinder is hinged to the swing arm shell, particularly to the outer side of the tubular structure. Under the telescopic driving of the oil cylinder, the swinging arm shell can swing up and down relative to the fixed seat by taking the tubular structure as a shaft, so that the height of the connecting shaft and the height of the crushing teeth can be adjusted. The installation position of the relative fixed seat and the swing arm shell is preferably centered front and back.

Further, a front wear sleeve 114 may be disposed between the front support arm and the tubular structure, and a rear wear sleeve 115 may be disposed between the rear support arm and the tubular structure. The front and rear wear-resistant sleeves are respectively tightly matched with the front and rear ends of the tubular structure and are respectively in clearance fit with the front and rear supporting arms. The front and rear wear-resistant sleeves can reduce the abrasion of the tubular structure and prolong the service life of the swing arm shell.

The fixing base can include end plate 111, preceding backup pad and back backup pad, fixed connection can be dismantled respectively on the front and back side of end plate to the one end of preceding backup pad and back backup pad, and the other end overhangs, preceding backup pad acts as respectively with back backup pad preceding supporting arm and back supporting arm. The fixing seat adopts a split structure, and the installation of the swing arm shell, the front wear-resistant sleeve, the rear wear-resistant sleeve and the like can be facilitated. The oil cylinder is positioned between the end plate and the swing arm shell, the upper part of the end plate and the lower part of the tubular structure are respectively provided with a hinge seat 113 and a hinge seat 123, and two ends of the oil cylinder are respectively connected with the two hinge seats.

Preferably, a plurality of shaft sleeves are sleeved side by side and circumferentially fixed outside the connecting shaft, and a plurality of crushing teeth are fixedly mounted on each shaft sleeve. The individual crushing teeth on each bushing are preferably circumferentially equispaced. Each shaft sleeve and the connecting shaft can be connected through a plurality of flat keys which are uniformly distributed in the circumferential direction, the circumferential fixing is reliable, and the axial assembly and disassembly of the shaft sleeves are facilitated. The left and right support arms play a role in limiting the shaft sleeve forwards and backwards. When a certain broken tooth is damaged, only the broken tooth and the shaft sleeve where the broken tooth is located need to be replaced, and the maintenance is simple and convenient.

In addition, according to the actual distribution characteristics of the rock mass on the conveying groove of the conveyor in the front and rear directions, the crushing teeth and the corresponding shaft sleeves with different parameters can be arranged at different positions in the front and rear of the connecting shaft.

The swing type crushing mechanism driven by the rocker power further comprises a mining machine rocker 2, and a shell of the mining machine rocker is an L-shaped structural unit comprising a cylinder 21 and an arm support. The cylinder extends forwards and backwards, the arm support extends leftwards and rightwards, and the cylinder is located behind one end of the arm support. The assembly body composed of the fixed seat, the swing arm and the oil cylinder is arranged on the inner side of the corner of the L shape, so that the space can be fully utilized, the extra occupation of the space in the front-back direction is avoided, and the installation of the crushing device on the low-machine-body mining machine can be realized. The fixed seat is fixedly connected to the side wall of the barrel, the front portion of the tubular structure is connected with the rear portion of the arm support in a positioning mode through a circular spigot structure, and the circular spigot structure is coaxial with the rotating shaft so as to keep the axis of the swing arm shell in a swinging mode to be fixed relative to the mining machine rocker arm. The front end of the revolving shaft is coaxially connected with the rear end of a gear shaft of a transmission gear 22 of a cutting transmission system in the arm support. The transmission gear replaces a traditional motor to provide power for the rotation of the crushing teeth.

In this embodiment, the connection mode of the fixing seat and the cylinder is as follows: a shallow groove 211 with a plane groove bottom surface is cut on the side surface of the cylinder body, a pin hole 212 is arranged on the groove bottom surface, the back surface of the end plate is attached to the groove bottom surface, and the end plate and the cylinder body are positioned through two pins (namely the pins 112) on one surface (namely the groove bottom surface).

The rear end of the gear shaft of the transmission gear is provided with an internal spline 221, the front end of the rotating shaft is also provided with an internal spline, and the internal spline forms the power input interface structure. The gear shaft and the revolving shaft of the transmission gear are simultaneously connected with the front part and the rear part of one spline shaft 3 through splines. Due to the floating nature of the spline coupling, it is possible to provide alignment between the swing arm housing 12 and the drive gear 22, thus improving the stability of the transmission. In addition, when the hard rock is crushed or the rock is jammed, the spline shaft is broken first to protect the cutting transmission system and the transmission system of the crushing mechanism in the front arm support, so that the transmission reliability can be improved.

The axis on which the swing arm shell swings is fixed relative to the mining machine rocker arm, and when the mining machine rocker arm cuts ore layers with different heights, such as a lower ore layer 91 and an upper ore layer 92, the heights of the rocker arms are different, and the height position of the swing arm shell is changed accordingly. But the height of the crushing teeth can be adjusted to adapt to different height positions of the mining machine rocker arm through the extension and retraction of the oil cylinder. When the upper cutter is cut (see figure 6), the oil cylinder can be controlled to contract until the lower swing angle of the swing arm reaches the position that the cutting round bottom part of the crushing tooth is slightly lower than the bottom of the arm support shell, and when the lower cutter is cut (see figure 7), the oil cylinder can be controlled to extend until the upper swing angle of the swing arm reaches the position that the cutting round bottom part of the crushing tooth is slightly lower than the bottom of the arm support shell.

Further, a front end cover is sleeved on the radial outer portion of the front end of the rotating shaft, and the rear portion of the front end cover is embedded and fixed in the tubular structure. The rear end of the gear shaft of the transmission gear is sleeved with a rear end cover radially outwards, and the front part of the rear end cover is embedded and fixed on the arm support. The front end cover and the rear end cover are connected in an axial and radial positioning mode through a circular spigot structure. The front end cover is fixed on the tubular structure, the rear end cover is fixed on the arm support, the front end cover and the rear end cover are positioned through the circular seam allowance structure, and the front part of the tubular structure and the rear part of the arm support are positioned through the circular seam allowance structure to play the same role, so that the swinging center line of the swinging arm shell is positioned, and the joint of the transmission system in the swinging arm and the cutting transmission system is protected.

Furthermore, a radial seal is arranged between the front end cover and the rear end cover.

The swing arm powered crushing mechanism may also include a mechanical guard 14 for preventing crushing teeth from damaging the conveyor below the crushing mechanism. The mechanical protection structure comprises a support and a plurality of rollers installed on the support, the support is fixed on a front arm support, the axes of the rollers horizontally extend forwards and backwards, the rollers are arranged in an arc-shaped area with the axis of the connecting shaft as the axis at intervals in the circumferential direction, the position of the arc-shaped area is lower than the axis of the connecting shaft, the rollers can freely rotate relative to the support, and the farthest distance from the edge of each roller to the axis of the connecting shaft is larger than the radius of a cutting circle of each crushing tooth. Even if the swing arm is located at the lower swing limit position, the rollers are firstly contacted with the top surface of the front side ledge of the conveyor, so that the crushing teeth can be prevented from cutting the top of the conveyor groove.

Still install the guard shield 126 on the main casing body, the guard shield is in the top of connecting axle, prevents that the rock mass after the breakage from upwards splashing.

The front and back are referred to herein as up and down, respectively, from the perspective of fig. 2.