阅读说明：本技术 短跨距薄煤层采煤机 (Short-span thin coal seam coal mining machine ) 是由 史春祥 章立强 董超 王振乾 胡滔 胡璟 宋振 钱立全 丁海春 郭岱 顾恩洋 于 2020-05-22 设计创作，主要内容包括：本发明涉及一种短跨距薄煤层采煤机,包括截割系统、机身、导向滑靴、拖动连接装置和支撑滑靴,截割系统的无电机摇臂的根部旋转支撑在非摆动传动部的静置壳体内,截割系统的截割电机、大齿轮、行星机构这类大中尺寸零件均不随摇臂的摆动而改变位置,静置壳体固定在机身上,并位于机身的前方,二者组成采煤机的基础框架,导向滑靴和支撑滑靴均安装在基础框架上,二者分别从下方支撑基础框架的后部和中部,机身通过所述拖动连接装置与刮板输送机的拖动链浮动连接。本发明能解决开采高度低、煤岩硬度高等条件复杂的极薄或薄煤层工作面的矮机身大功率薄煤层采煤机的结构布置难题。(The invention relates to a short-span thin coal seam coal mining machine, which comprises a cutting system, a machine body, a guide sliding shoe, a dragging connecting device and a support sliding shoe, wherein the root part of a rocker arm without a motor of the cutting system is rotatably supported in a standing shell of a non-swinging transmission part, large and medium-sized parts such as a cutting motor, a gear wheel and a planetary mechanism of the cutting system do not change positions along with the swinging of the rocker arm, the standing shell is fixed on the machine body and positioned in front of the machine body, the standing shell and the machine body form a basic frame of the coal mining machine, the guide sliding shoe and the support sliding shoe are both arranged on the basic frame and respectively support the rear part and the middle part of the basic frame from the lower part, and the machine body is in floating connection with a dragging chain. The invention can solve the problem of structural arrangement of the low-machine-body high-power thin coal seam coal mining machine for mining ultra-thin or thin coal seam working faces with complex conditions such as low mining height, high coal rock hardness and the like.)

1. The utility model provides a short span thin seam coal mining machine which characterized in that: the cutting system comprises a non-swing transmission part, a motor-free rocker arm, a cutting motor and an oil cylinder, wherein the non-swing transmission part comprises a standing shell and a left set of front-stage transmission system and a right set of front-stage transmission system which are arranged in the standing shell, the left set of the motor-free rocker arm and the right set of the motor-free rocker arm respectively comprise a left motor installation cavity and a right motor installation cavity, the left set of the motor-free rocker arm and the right set of the motor-free rocker arm are arranged in the standing shell, the left set of the motor-free rocker arm and the right set of the motor-free rocker arm are respectively and rotatably supported in the left rocker arm installation cavity and the right set of the rocker arm installation cavity, one cutting motor is fixedly installed in each motor installation cavity, the roots of the left rocker arm and the right rocker arm installation cavities of the rocker arm shells of the left set and the, the input end of the rear-stage transmission system is provided with a gearwheel and a planetary mechanism which are coaxially connected in turn, the gearwheel and the planetary mechanism are arranged in a cavity at the root part of the corresponding rocker arm shell, the axis of the bull gear is coaxial with the rotation center of the root part of the rocker arm shell, each motor-free rocker arm corresponds to one oil cylinder, two ends of the oil cylinder are respectively hinged with the standing shell and the corresponding rocker arm shell, the axis of the gearwheel and the hinged axes at two ends of the oil cylinder extend along the front-back direction, the standing shell is fixed on the machine body, the guide sliding shoes and the support sliding shoes are arranged on the basic frame, the guide sliding shoes and the support sliding shoes support the rear part and the middle part of the basic frame from the lower part respectively, and the machine body is in floating connection with a drag chain of a scraper conveyor through the drag connection device.

2. The short span thin seam shearer of claim 1, wherein: the output end of the preceding stage transmission system adopts a pinion and an intermediate gear set which are externally engaged with each other, the intermediate gear set is externally engaged with the gearwheel, the intermediate gear set comprises an eccentric shaft, an eccentric sleeve, a bearing and an intermediate gear, the eccentric shaft comprises a reference shaft section positioned at two ends and an eccentric shaft section positioned in the middle, an outer eccentric groove and an inner eccentric groove which extend along the axial direction and are sealed at two ends are respectively arranged at the positions which are farthest and closest to the axis of the reference shaft section on the surface of the eccentric shaft section, a key groove which extends along the axial direction and is not sealed at two ends is arranged at the thickest part of the wall thickness of the hole wall of the eccentric sleeve, the eccentric sleeve is sleeved on the eccentric shaft section, the key groove is matched with the outer eccentric groove or the inner eccentric groove and forms key connection with the key between the eccentric shaft and the eccentric sleeve, and the reference shaft sections at two ends of the eccentric, the eccentric shaft is provided with two optional installation positions, namely the positions of the outer eccentric groove and the inner eccentric groove which are closest to the axis of the large gear.

3. The short span thin seam shearer of claim 2, wherein: the utility model discloses a rocking arm casing, including rocking arm installation cavity, gear wheel group, rocking arm casing, the casing of stewing on the casing public lateral wall between rocking arm installation cavity and other adjacent cavities is equipped with the casing notch, be equipped with rocking arm casing breach on the root lateral wall of rocking arm casing, under the installation status, rocking arm casing breach in week always keep with there is partial overlap area in the casing notch, the intermediate gear group with the gear wheel is in the overlap area of casing notch and rocking arm casing breach keeps meshing.

4. The short span thin seam shearer of claim 3, wherein: the bearing seat is further fixed on the inner wall of the cavity at the root of the rocker arm shell, the position, close to the large gear, of the inner wall of the cavity is close to the inner wall of the cavity, the input shaft diameter of the large gear is supported on the inner wall of the bearing seat through a bearing, a bearing seat notch is formed in the side wall of the bearing seat, and the circumferential position and the size of the bearing seat notch are consistent with those of the rocker arm shell notch.

5. The short span thin seam shearer of claim 4, wherein: the left and right sides of the standing shell are respectively provided with a guard plate, the standing shell, the left and right rocker arm shells and the guard plates on the corresponding sides jointly enclose a left closed cavity and a right closed cavity, and the left and right oil cylinders are respectively positioned in the left closed cavity and the right closed cavity.

6. The short span thin seam shearer of claim 1, 2, 3, 4, or 5, wherein: the cutting system further comprises a left hydraulic system and a right hydraulic system, rear spaces of the left front-stage transmission system and the right front-stage transmission system in the standing shell are respectively arranged into an oil tank, the left hydraulic system and the right hydraulic system are respectively arranged in the left oil tank and the right oil tank, a transmission shaft in the front-stage transmission systems replaces a pump motor of the corresponding side hydraulic system to provide power for the hydraulic systems, and hydraulic pressure output by the hydraulic systems is used as hydraulic driving force of the oil cylinders on the corresponding side.

7. The short span thin seam mining machine of claim 1, 2, 3, 4, 5 or 6, wherein: the machine body is a solid body without transmission inside, the top surface of the machine body is mostly arranged into an inclined plane with a high front part and a low back part, and the middle part of the bottom surface of the machine body is arranged into an inwards concave surface.

8. The short span thin seam shearer of claim 7, wherein: the articulated through wearing to establish the gyration pin between direction boots and the fuselage, the articulated axis extends around, the pinhole of wearing to establish the gyration pin on the direction boots is the waist type hole that width is greater than about width about, the leading flank and the trailing flank of direction boots are the middle part and lean on the smooth transition surface in outer, both ends about, lean on.

9. The short span thin seam shearer of claim 7, wherein: the upper portion of supporting the skid shoe articulates on the fuselage, and the articulated axis extends around, the bottom of supporting the skid shoe is equipped with two holding surfaces in front and at the back, is second holding surface and first holding surface respectively, first holding surface is higher than the second holding surface, and first holding surface and second holding surface all are equipped with the wearing layer.

10. The short span thin seam shearer of claim 7, wherein: drag connecting device includes the connecting plate and connects and colludes, the one end of connecting plate is articulated through last connecting pin on the fuselage, the diameter that is used for wearing to establish the pinhole on the connecting plate of connecting pin on the connecting plate is greater than go up the connecting pin, the other end of connecting plate is articulated through connecting pin and the one end of connecting colluding down, and these two articulated axes are and control the extension, the other end of connecting colluding sets to the cylinder structure that extends about the axis, this cylinder structure set up at scraper conveyor's chain inslot, and with chain groove sliding connection, a drag chain is respectively connected at the both ends of cylinder structure.

Technical Field

The invention relates to a thin coal seam coal mining machine which can adapt to mining of an ultra-thin or thin coal seam working face with complex conditions such as low mining height, high coal rock hardness and the like.

Background

For mining of thin or extremely-thin coal seams, the mining height is often low (some mining heights meet the requirement of 0.8m), the geological conditions are complex (such as coexistence of coal and rock and high hardness), and the like, so in order to improve the reliability of the coal mining machine, the machine body of the thin coal seam coal mining machine is required to be short enough, and the installed power is required to be higher and higher, so that the adaptability of the thin coal seam coal mining machine is improved. However, as the power is increased, the sizes of the motor, the transmission system and the like are correspondingly increased greatly, the coal face is usually narrow in space when the thin coal seam is mined, if the overall size of the coal mining machine is too large, the peripheral space of the coal mining machine is compressed, for example, the machine clearance and the coal passing height are reduced, the passing and loading of the coal mining machine can be seriously influenced, and therefore the problem of difficult structural arrangement of the thin or extremely thin coal seam coal mining machine is more prominent due to the increase of the installed power.

The technical proposal that large and medium-sized parts such as motors, transmission gears and the like are moved forwards from the upper part of the original scraper conveyor to the side close to the coal wall is proposed and gradually used in the industry, namely, the arrangement problem of the large and medium-sized parts is solved by adopting a mode of suspending a machine body. This approach can be used with shearers for relatively thin seams of coal, but still does not satisfy the mining of very thin or thin seams of coal. Moreover, although this method can improve the structural arrangement problem to some extent, for example, it is helpful to increase the gap between the two rolls, it also brings other outstanding problems, for example, the height of the shearer arranged between the left and right rolls close to the coal wall side is too high, the span between the rolls is too large, the adaptability of the rolls to the mining height is poor, the height of the face of the shearer under the support is high, the coal passing space above the scraper conveyor is small, and the adaptability to the undulated working face is poor.

Disclosure of Invention

The invention aims to provide a short-span thin seam coal mining machine, which solves the structural arrangement problem of a short-machine-body high-power thin seam coal mining machine for an ultra-thin or thin seam working surface with complex conditions such as low mining height, high coal rock hardness and the like.

The main technical scheme of the invention is as follows:

a short-span thin seam coal mining machine comprises a cutting system, a machine body, a guide sliding shoe, a dragging connecting device and a support sliding shoe, wherein the cutting system comprises a non-swing transmission part, a motor-free rocker arm, a cutting motor and an oil cylinder, the non-swing transmission part comprises a standing shell and a left set of front-stage transmission system and a right set of front-stage transmission system which are arranged in the standing shell, the motor-free rocker arm comprises a left motor-free rocker arm and a right motor-free rocker arm, the left set of rocker arm and the right set of front-stage transmission system respectively comprise a rocker arm shell and a rear-stage transmission system which are arranged in the rocker arm shell, a left motor installation cavity and a right motor installation cavity and a left rocker arm installation cavity and a right rocker arm installation cavity are arranged in the standing shell, one cutting motor is fixedly installed in each motor installation cavity, the roots of the left rocker arm shell and the right rocker arm shell, the input end of the rear-stage transmission system is provided with a gearwheel and a planetary mechanism which are coaxially connected in turn, the gearwheel and the planetary mechanism are arranged in a cavity at the root part of the corresponding rocker arm shell, the axis of the bull gear is coaxial with the rotation center of the root part of the rocker arm shell, each motor-free rocker arm corresponds to one oil cylinder, two ends of the oil cylinder are respectively hinged with the standing shell and the corresponding rocker arm shell, the axis of the gearwheel and the hinged axes at two ends of the oil cylinder extend along the front-back direction, the standing shell is fixed on the machine body, the guide sliding shoes and the support sliding shoes are arranged on the basic frame, the guide sliding shoes and the support sliding shoes support the rear part and the middle part of the basic frame from the lower part respectively, and the machine body is in floating connection with a drag chain of a scraper conveyor through the drag connection device.

The output end of the preceding stage transmission system adopts a pinion and an intermediate gear set which are externally engaged with each other, the intermediate gear set is externally engaged with the gearwheel, the intermediate gear set comprises an eccentric shaft, an eccentric sleeve, a bearing and an intermediate gear, the eccentric shaft comprises a reference shaft section positioned at two ends and an eccentric shaft section positioned in the middle, an outer eccentric groove and an inner eccentric groove which extend along the axial direction and are sealed at two ends are respectively arranged at the positions which are farthest and closest to the axis of the reference shaft section on the surface of the eccentric shaft section, a key groove which extends along the axial direction and is not sealed at two ends is arranged at the thickest part of the wall thickness of the hole wall of the eccentric sleeve, the eccentric sleeve is sleeved on the eccentric shaft section, the key groove is matched with the outer eccentric groove or the inner eccentric groove and forms key connection with the key between the eccentric shaft and the eccentric sleeve, and the reference shaft sections at two ends of the eccentric, the eccentric shaft is provided with two optional installation positions, namely the positions of the outer eccentric groove and the inner eccentric groove which are closest to the axis of the large gear.

The utility model discloses a rocking arm casing, including rocking arm installation cavity, gear wheel group, rocking arm casing, the casing of stewing on the casing public lateral wall between rocking arm installation cavity and other adjacent cavities is equipped with the casing notch, be equipped with rocking arm casing breach on the root lateral wall of rocking arm casing, under the installation status, rocking arm casing breach in week always keep with there is partial overlap area in the casing notch, the intermediate gear group with the gear wheel is in the overlap area of casing notch and rocking arm casing breach keeps meshing.

The bearing seat is further fixed on the inner wall of the cavity at the root of the rocker arm shell, the position, close to the large gear, of the inner wall of the cavity is close to the inner wall of the cavity, the input shaft diameter of the large gear is supported on the inner wall of the bearing seat through a bearing, a bearing seat notch is formed in the side wall of the bearing seat, and the circumferential position and size of the bearing seat notch are preferably consistent with those of the rocker arm shell notch.

The left and right sides of the standing shell are respectively provided with a guard plate, the standing shell, the left and right rocker arm shells and the guard plates on the corresponding sides jointly enclose a left closed cavity and a right closed cavity, and the left and right oil cylinders are respectively positioned in the left closed cavity and the right closed cavity.

The cutting system further comprises a left hydraulic system and a right hydraulic system, rear spaces of the left front-stage transmission system and the right front-stage transmission system in the standing shell are respectively arranged into an oil tank, the left hydraulic system and the right hydraulic system are respectively arranged in the left oil tank and the right oil tank, a transmission shaft in the front-stage transmission systems replaces a pump motor of the corresponding side hydraulic system to provide power for the hydraulic systems, and hydraulic pressure output by the hydraulic systems is used as hydraulic driving force of the oil cylinders on the corresponding side.

The machine body is a solid body without transmission inside, the top surface of the machine body is mostly arranged into an inclined plane with a high front part and a low back part, and the middle part of the bottom surface of the machine body is arranged into an inwards concave surface.

The articulated through wearing to establish the gyration pin between direction boots and the fuselage, the articulated axis extends around, the pinhole of wearing to establish the gyration pin on the direction boots is the waist type hole that width is greater than about width about, the leading flank and the trailing flank of direction boots are the middle part and lean on the smooth transition surface in outer, both ends about, lean on.

The upper portion of supporting the skid shoe articulates on the fuselage, and the articulated axis extends around, the bottom of supporting the skid shoe is equipped with two holding surfaces in front and at the back, is second holding surface and first holding surface respectively, first holding surface is higher than the second holding surface, and first holding surface and second holding surface all are equipped with the wearing layer.

Drag connecting device can include the connecting plate and connect and collude, the one end of connecting plate is articulated through last connecting pin on the fuselage, the diameter that is used for wearing to establish the pinhole on the connecting plate of connecting pin on the connecting plate is greater than go up the connecting pin, the other end of connecting plate is articulated through connecting pin and the one end of connecting colluding down, and these two articulated axes are and control the extension, the other end of connecting colluding sets to the cylinder structure that extends about the axis, this cylinder structure set up at scraper conveyor's chain inslot, and with chain groove sliding connection, a drag chain is respectively connected at the both ends of cylinder structure.

The invention has the beneficial effects that:

the invention adopts a cutting system with a brand new structure, the swinging transmission part swings relative to the fixed shaft of the non-swinging transmission part, large and medium-sized parts such as a cutting motor, a planetary mechanism, a large gear and the like are placed in the shell of the non-swinging transmission part, and when the swinging transmission part rotates, the positions of the large and medium-sized parts are unchanged, so that the front roller bottom mining cutter cuts a channel of the suspended machine body, the rear roller top mining cutter cuts a residual coal platform, which cannot be influenced by the large and medium-sized parts, and the rocker arm shell cannot interfere with the coal platform, thereby realizing the arrangement mode of the suspended machine body, reducing the height of the machine body of the coal mining machine and ensuring the due mining height range.

According to the invention, large and medium-sized parts of the coal mining machine are arranged in a C area close to a coal wall, small and medium-sized parts of the coal mining machine are arranged in a B area, and small-sized parts or short-sized parts are arranged in an A area below a thick beam of the support, so that the overall structure of the low-machine-body high-power thin coal seam coal mining machine can be smoothly arranged under the condition of low mining height, and enough gaps are kept between the coal mining machine and the support, between the coal mining machine and a scraper conveyor, thus the mining requirements of a fluctuating top floor, coal gangue and the like are met, and the smooth mining of an ultra-thin or thin coal seam with complicated conditions of coal rock coexistence.

The top surface of the machine body below the top beam of the support is set to be an inclined plane with a high front part and a low rear part, and the bottom surface of the middle part of the machine body is set to be a concave surface with a concave middle part in the front-back direction, so that enough space is reserved between the machine body and the top beam and between the machine body and the chute of the scraper conveyor, and the adaptability of the thin seam coal mining machine to the working surface under the fluctuating condition is improved.

The cutting system of the invention adopts the gear speed change mechanism taking the eccentric shaft and the eccentric sleeve as the core, can realize wide-range speed change by changing the installation direction of the eccentric shaft and the eccentric sleeve and matching and replacing the big gear and the small gear with different sizes, and can make more choices of parameters such as cutting force, cutting linear speed and the like by matching with the rollers with different specifications, thereby being suitable for mining materials with different hardness such as coal, rock and the like.

The invention utilizes the standing shell, the rocker arm shell and the guard plate to enclose a closed cavity together, provides a good external working environment for the oil cylinder, avoids the adverse effects of coal dust, gangue and the like on the oil cylinder, ensures that the oil cylinder stretches more reliably and has longer service life, thereby providing more reliable and high-quality support for the rotation of the rocker arm relative to the non-swinging transmission part.

According to the invention, a branch is led out from the non-swing transmission part to replace a pump motor to provide power for the pump set of the hydraulic system, and the power of the cutting motor is far greater than that of the pump motor, so that even if the power requirement of the hydraulic system is larger, the hydraulic system does not need to occupy larger installation space due to the need of equipping a pump motor with larger power as in the traditional pump set, and therefore, the hydraulic system has a compact structure and is rich in power.

The invention fully utilizes the idle space in the standing shell of the non-swing transmission part as the oil tank of the hydraulic system, and the hydraulic system is installed by the idle space, so that the structure of the coal mining machine is more compact, the height of the machine surface is not increased, and the span of the roller is not increased.

According to the invention, the supporting sliding shoes are arranged below the middle part in the front-back direction of the basic frame consisting of the machine body and the standing shell, the guiding sliding shoes and the dragging connecting device are arranged below the rear part, the supporting sliding shoes and the guiding sliding shoes are used for keeping the stability of the coal mining machine, and meanwhile, the guiding sliding shoes are kept in sliding fit with the track for normal guiding, so that the normal walking of the coal mining machine is ensured. By adopting the mode that the guide sliding shoes are combined with the dragging connecting device and the dragging connecting device is connected with the machine body in a floating mode, the guide sliding shoes bear cutting counter force of the coal mining machine, the dragging connecting device only bears dragging force in the left and right directions, so that abrasion at the chain groove is greatly reduced, and the service life of the dragging connecting device can be greatly prolonged.

The invention adopts the supporting sliding shoes with double supporting surfaces, so that not only the contact surface is multiplied, but also the second supporting surface can move the supporting position to the coal wall direction, thereby greatly improving the stability of the suspended machine body coal mining machine.

Drawings

FIG. 1 is a horizontal cross-sectional view of one embodiment of the present invention;

fig. 2 is a front view (right and left sides) of the cutting system of fig. 1;

FIG. 3 is a partial cross-sectional view (left side) of the cutting system of FIG. 1;

FIG. 4 is a longitudinal cross-sectional view of the embodiment of FIG. 1;

FIG. 5 is a schematic structural view of the motorless rocker arm of FIG. 3;

FIG. 6 is a partial cross-sectional view of the rocker arm housing notch and bearing seat notch of FIG. 5;

FIG. 7 is a schematic structural view (left side) of another embodiment of the non-oscillating actuator;

FIG. 8 is a schematic illustration of the intermediate gear set of FIG. 7;

FIG. 9 is a top view of the fuselage of FIG. 1;

FIG. 10 is a front view of the support slipper of FIG. 2;

FIG. 11 is a longitudinal cross-sectional view of FIG. 10;

fig. 12 is a schematic structural diagram of the dragging connecting device.

Reference numerals:

1. a cutting system; 11. a non-swing transmission part; 110. a cutting motor; 111. standing the shell; 1111. a front positioning hole; 1112. a rear positioning hole; 1113. a housing slot; 113. a guard plate; 114. a hydraulic system; 115 (and 115', 115 "), pinion; 116. an intermediate gear set; 1161. an eccentric shaft; 1162. an eccentric sleeve; 1163. a bearing; 1164. an intermediate gear; 12. a motor-free rocker arm; 121. a rocker arm housing; 1211. a rocker arm housing gap; 122 (and 122', 122 "), bull gears; 123. a planetary mechanism; 124. supporting and positioning the bearing; 125. a fixed-axis gear transmission structure; 126. a bearing seat; 1261. a bearing seat notch; 13. an oil cylinder; 14. a drum;

2. a body; 21. a butt joint surface; 22. a pin hole; 23. connecting holes; 231. a mounting cavity; 24. a wire passing hole; 25. a bevel; 26. a concave surface; 27. a guide mounting groove; 28. the dragging connection mounting groove;

31. positioning pins; 32. a fastener;

4. a guide shoe;

5. a drag connection device; 51. a connecting plate; 52. a connecting hook; 53. an upper connecting pin; 54. a lower connecting pin;

6. supporting the slipper; 61. a double ear seat; 64. a first support surface; 65. a second support surface;

91. a support top beam;

92. a scraper conveyor; 921. a track; 922. drag the chain.

Detailed Description

The invention discloses a short-span thin coal seam mining machine (which can be called as a thin coal seam mining machine for short), which comprises a cutting system 1, a machine body 2, a guide sliding shoe 4, a dragging connecting device 5 and a support sliding shoe 6, as shown in figures 1-12. The cutting system comprises a non-swing transmission part 11, a motor-free rocker arm 12, a cutting motor 110 and an oil cylinder 13. The non-swing transmission part comprises a standing shell 111 and a left front-stage transmission system and a right front-stage transmission system which are arranged in the standing shell. The motor-free rocker arm is equivalent to a swing transmission part, has a left rocker arm and a right rocker arm, and comprises a rocker arm shell 121 and a rear-stage transmission system arranged in the rocker arm shell. The cutting machine is characterized in that a left motor installation cavity, a right motor installation cavity, a left rocker arm installation cavity and a right rocker arm installation cavity are arranged in the standing shell, one cutting motor is fixedly installed in each motor installation cavity, the roots of the left rocker arm shell and the right rocker arm shell without motor rocker arms, which are in a cylindrical structure, are rotatably supported in the left rocker arm installation cavity and the right rocker arm installation cavity respectively, so that each rocker arm shell can do fixed-axis swinging relative to the standing shell, and the roots of the rocker arm shells only rotate in the standing shell.

The output shaft of each cutting motor is connected with the rear-stage transmission system on the corresponding side through the front-stage transmission system on the corresponding side, namely, the power output by the cutting motor is transmitted to the roller 14 at the other end of the rocker arm shell on the corresponding side through the front-stage transmission system and the rear-stage transmission system on the corresponding side in sequence. The input end of the rear-stage transmission system is provided with a gearwheel 122 and a planetary mechanism 123 which are sequentially and coaxially connected, the gearwheel and the planetary mechanism are arranged in a corresponding cavity at the root of the rocker arm shell, and the axis of the gearwheel is coaxial with the rotation center at the root of the rocker arm shell. When the rocker arm swings in a fixed axis mode, the large gear 122 and the planetary mechanism 123 serving as large and medium-sized parts in the rear-stage transmission system are always in situ self-rotated in the standing shell, and the cutting motor serving as the other large and medium-sized part is installed in the standing shell, so that the position of the cutting motor cannot be changed along with the swinging of the rocker arm, particularly the height of the cutting motor is not changed, a large space can be kept between the rocker arm shell and an upper coal platform, and the rocker arm shell cannot interfere with the coal platform and the like even when the rear rocker arm is used for mining a top cutter. Therefore, the invention can solve the problem of arrangement of large and medium-sized parts and can ensure that the theoretical mining height range is not shrunk. In addition, compared with the middle-small-size parts of the cutting system, the large-middle-size parts are closer to the coal wall side, and the height of the machine face of the coal mining machine is favorably reduced. When the coal mining machine is matched with the scraper conveyor 92 and the support, the machine body is positioned below the support top beam 91, and the front part of the machine body is positioned above the chute of the scraper conveyor 92. The area A in the figures 1 and 4 corresponds to the lower area of the thick beam of the bracket, the area B corresponds to the lower area of the thin beam of the bracket, the area extends forwards to the position of the rear edge of the roller, and the area C corresponds to the full-length range of the roller. After the cutting system with the structure is adopted, large and medium-sized parts such as a roller, a cutting motor, a planetary mechanism and the like in the cutting system are all positioned in a C area closer to the coal wall side, and the small and medium-sized parts are mainly arranged in a B area, so that the space can be utilized more reasonably, the lower machine passing height is kept, and meanwhile, the improvement of the installed power is not influenced.

Each motor-free rocker arm corresponds to one oil cylinder 13, and two ends of each oil cylinder are respectively hinged with the standing shell and the corresponding rocker arm shell. The axis of the bull gear and the hinge axis at the two ends of the oil cylinder extend along the front and back directions. The front and rear directions of the coal mining machine are respectively the directions from the inside of the coal mining machine to the coal wall side and the mining side of the coal mining machine, and respectively correspond to the upper and lower directions of fig. 1. The oil cylinder stretches and retracts to drive the motor-free rocker arm to swing relative to the non-swing transmission part.

The standing shell is fixed on the machine body and positioned in front of the machine body, and the standing shell and the machine body form a basic frame of the coal mining machine. In this embodiment, the front side of fuselage is equipped with butt joint face 21, pinhole 22 and connecting hole 23, during the connection, the butt joint face with the corresponding surface of the middle part rear side of casing 111 of stewing laminates each other, the both ends of locating pin 31 respectively with the fuselage with the corresponding pinhole shaft hole cooperation on the casing of stewing realizes the fuselage and the casing of stewing location between, utilize connecting hole 23 and the casing of stewing go up corresponding hole, through fastener 32 with the fuselage with the casing of stewing is fixed together. The machine body is also provided with a mounting cavity 231 and a wire passing hole 24, the mounting cavity is used for providing a fastening operation space for the fastener 32, and the wire passing hole is used for providing a channel for routing and running a pipe for cables, water pipes and the like of the cutting motor. The guide skid shoes and the support skid shoes are arranged on the base frame, the guide skid shoes and the support skid shoes respectively support the rear part and the middle part of the base frame from the lower part, and the machine body is in floating connection with a drag chain 922 of the scraper conveyor through the drag connection device 5.

Regarding the cutting system, as shown in fig. 3 and 5, in the installation state, the rocker arm installation cavity is opened backwards, the root barrel structure of the rocker arm shell is inserted into the rocker arm installation cavity from back to front, and is rotatably supported on the inner wall of the rocker arm installation cavity through the front and back two support positioning bearings 124. In this embodiment, the front and rear sections of the inner wall of the rocker arm mounting cavity are respectively a front positioning hole 1111 and a rear positioning hole 1112, which are respectively used for mounting the front and rear support positioning bearings 124.

The rocker arm shell further comprises a head part and a neck part positioned between the head part and the root part, the rocker arm shell is of a concave structure with both the head part and the root part protruding forwards relative to the neck part, and after the rocker arm shell is installed, the head part and the roller of the rocker arm shell and the non-swinging transmission part are located in the same area in the front-back direction, namely a C area. The large gear 122, the planetary mechanism 123 and the small and medium-sized fixed-axis gear transmission structure 125 constitute the rear stage transmission system. A fixed axis gear drive 125 is located within the neck and head cavities. A roller is mounted on the head of the rocker arm housing and rotates relative to the rocker arm housing.

The output of the pre-stage transmission system may employ a pinion 115 and an intermediate gear set 116 that are externally meshed with each other, the intermediate gear set being externally meshed with the bull gear.

In this embodiment, the intermediate gear set 116 preferably includes an eccentric shaft 1161, an eccentric sleeve 1162, a bearing 1163 and an intermediate gear 1164, the eccentric shaft includes a reference shaft segment at two ends and an eccentric shaft segment at a middle portion, and an outer eccentric slot and an inner eccentric slot extending in the axial direction and closed at two ends are respectively formed on the surfaces of the eccentric shaft segments at positions farthest from and closest to the axis of the reference shaft segment. The key groove is axially extended at the thickest part of the wall thickness of the hole wall of the eccentric sleeve, the two ends of the key groove are not closed, the eccentric sleeve is sleeved on the eccentric shaft section, and the key groove is matched with the outer eccentric groove or the inner eccentric groove and forms key connection with the key between the eccentric shaft and the eccentric sleeve. The reference shaft sections at the two ends of the eccentric shaft are fixed on the standing shell, the intermediate gear 1164 is installed on the outer cylindrical surface of the eccentric sleeve through the bearing 1163, the intermediate gear is located between the small gear 115 and the large gear 122 and is respectively engaged with the small gear and the large gear, and the axes of the small gear, the intermediate gear and the large gear are located in the same plane. The pinion, the middle gear set and the bull gear form a gear speed change mechanism.

The eccentric shaft has two optional mounting positions relative to the static shell, namely the positions of the outer eccentric groove and the inner eccentric groove which are closest to the axis of the bull gear respectively. The eccentric sleeve also has two optional installation positions relative to the eccentric shaft section, namely the positions of the outer eccentric groove and the inner eccentric groove on the eccentric shaft section, which are matched with the key groove on the eccentric sleeve and connected with the key. When the eccentric shaft and the eccentric sleeve are arranged and assembled according to two optional installation positions, the axis of the outer cylindrical surface of the eccentric sleeve can have 3-4 positions under the condition that the installation position of the reference shaft section of the eccentric shaft is fixed, namely, the axis of the intermediate gear 1164 has 3-4 possible positions, in other words, the distance between the intermediate gear and the axis of the large gear and the small gear can have 3-4 possible changes. By simply replacing the bull gears 122, 122 'or 122 "of different sizes and the pinions 115, 115' or 115" of different sizes to accommodate such variations in spacing, different reduction ratios can be achieved, resulting in a wide range of speeds at the drum for speed change purposes.

By adopting the gear speed change mechanism, different rotating speed outputs of the tail end roller can be realized, so that different output cutting parameters such as cutting force, cutting linear speed and the like can be obtained, and mining of materials with different hardness such as coal and rock can be realized after rollers with different diameters are configured.

At least one outer end face of the reference shaft section can be provided with a key groove, and the key groove and the key are matched to realize the positioning and rotation prevention of the eccentric shaft. The keyway preferably extends in a direction perpendicular to the plane in which the axes of the pinion, intermediate gear and bull gear lie, in this embodiment in a vertical direction.

And a shell notch 1113 is formed in a common side wall between the rocker arm installation cavity and other adjacent cavities (mainly referring to a cavity where the output end of the preceding stage transmission system is located) on the standing shell and is used for providing a space for the rotation of the intermediate gear. The side wall of the root part of the rocker arm shell is correspondingly provided with a rocker arm shell notch 1211, and in the installation state, the rocker arm shell notch 1211 and the shell notch 1113 are always kept to have a partial overlapping area in the circumferential direction, and the overlapping area is large enough to ensure that the middle gear set and the large gear are kept meshed in the overlapping area of the shell notch and the rocker arm shell notch.

In this embodiment, a bearing seat 126 is further fixed on the inner wall of the chamber at the root of the rocker arm housing 121, the inner wall of the bearing seat 126 being close to the large gear, and the shaft diameter of the input end of the large gear is supported by a bearing. In this case, a bearing seat indentation 1261 is also provided in the side wall of the bearing seat, see fig. 6, the circumferential location and size of the bearing seat indentation 1261 preferably corresponding to the rocker arm housing indentation 1211. The rocker arm housing indentation 1211 together with the bearing seat indentation 1261 provides sufficient space for the intermediate gear 1164 and the bull gear 122.

Besides the parts mentioned above, the front stage transmission system and the rear stage transmission system can adopt the existing transmission structure, such as gear transmission, spline transmission and the like.

The left and right sides of the standing shell are respectively provided with a guard plate 113, the standing shell, the left and right rocker arm shells and the guard plates on the corresponding sides jointly enclose a left closed cavity and a right closed cavity, and the left and right oil cylinders, the standing shell and oil cylinder seats arranged on the rocker arm shells are respectively positioned in the left and right closed cavities. In the installation state, in the swinging process of the rocker arm without the motor, the whole oil cylinder is always positioned in the closed cavity. The closed cavity provides a good external environment for the oil cylinder, for example, the influence of coal dust gangue on the oil cylinder can be avoided, the oil cylinder is more reliable in stretching and retracting and has a longer service life, and therefore, a more reliable and high-quality support is provided for the rotation of the rocker arm relative to the non-swinging transmission part.

The standing shell is preferably of a bilateral symmetry structure, and the two motor installation cavities are located in the middle of the left and right directions of the standing shell. The left rocker arm and the right rocker arm are arranged on the same standing shell, but are respectively driven by a left cutting motor and a right cutting motor. For the double-drum coal mining machine, the standing shell with the structure type can enable the whole structure of the coal mining machine to be more compact, and is suitable for double-drum operation of wide mining height and thin coal seam leftwards or rightwards.

The cutting system can also comprise a left hydraulic system 114 and a right hydraulic system 114, the rear spaces of the left and right front-stage transmission systems in the standing shell are respectively arranged into an oil tank, the left and right hydraulic systems are respectively arranged in the left and right oil tanks, a transmission shaft in the front-stage transmission systems is used for replacing a pump motor of the corresponding side hydraulic system to provide power for the hydraulic systems, and the hydraulic pressure output by the hydraulic systems is used as the hydraulic driving force of the oil cylinder on the corresponding side, namely the pump set of the hydraulic systems is a pump set without the pump motor. An oil tank opening can be formed in a top plate of the oil tank, so that a hydraulic system can be conveniently installed.

Because the power of the cutting motor is far greater than that of the pump motor, even if the power requirement of the hydraulic system is larger, the hydraulic system does not need to occupy larger installation space due to the need of equipping the pump motor with larger power as in the traditional pump set, and therefore the hydraulic system is compact in structure and has surplus power. The motor installation cavity and the rocker arm installation cavity are usually arranged at the left end and the right end of the standing shell, most space between the two cavities is an idle area, a part of the idle area is utilized to form a built-in oil tank, the oil tank of the hydraulic system is changed from an external position to a built-in position of the cutting system, the structure of the coal mining machine is more compact, the height of a machine face is not increased, and the span of a roller is not increased.

In this embodiment, the axle of the pinion 115 is used to output power to the hydraulic system at the same time.

The machine body 2 is a solid machine body without transmission inside, namely, a cavity for installing a transmission system is not arranged on the machine body, and the machine body only plays a role in connecting the cutting system with the guide sliding shoes and dragging the connecting device. The front part of the machine body is preferably set to be a structure with a thin middle part and thick two ends in the front-back direction, so that the machine surface of the whole machine body is short enough, and the coal passing space is large enough. Further, the top surface of the fuselage is mostly preferably configured as a slope 25 with a high front and a low rear, and the middle front part of the bottom surface of the fuselage is configured as a concave surface 26 that is concave toward the interior of the fuselage body. Further, the central surface of the concave surface is preferably provided as a slope of the same slope as the top surface of the fuselage directly above it.

The lower part of the machine body is provided with a guide installation groove 27 for providing space for installing the upper part of the guide sliding shoe. The upper part of the guide sliding shoe is hinged in the guide mounting groove through a rotary pin which penetrates through the guide sliding shoe, and the hinge axis extends forwards and backwards. The lower part of the guide slipper is provided with a guide groove, and the guide slipper rides on the track 921 of the scraper conveyor through the guide groove and can slide left and right along the track. The guide shoes can swing around the rotating pins in a vertical plane extending from left to right so as to adapt to the fluctuation of the bottom plate of the working surface. The pin hole penetrating through the rotary pin on the guide sliding shoe is preferably a waist-shaped hole with the left-right width larger than the upper-lower width. The front side surface and the rear side surface of the guide sliding shoe are preferably smooth transition surfaces with the middle part close to the outside and the left and right ends close to the inside, so that the guide sliding shoe can be enabled to deflect in a horizontal plane to adapt to the horizontal bending of the bottom plate of the working face. The term "outer" as used herein refers to the front and rear directions with respect to the front and rear sides, respectively. The guide sliding shoes balance the gravity of a part of the machine body, bear cutting reaction force and have a guide function of guiding the coal mining machine to slide along the track.

The surface of the guide groove matched with the track is subjected to special wear-resistant treatment and is wear-resistant, and the guide sliding shoe and the track are detachable and convenient to replace parts, so that the guide sliding shoe and the track can be replaced once worn to a certain degree, and the whole working efficiency and the reliability of equipment operation can be greatly improved.

The upper part of the supporting skid shoe is hinged on the machine body, and the hinge axis extends forwards and backwards. In this embodiment, the upper portion of the supporting sliding shoe is provided with a double-lug ear seat 61, a hinge seat is generally arranged at a corresponding position of the lower portion of the body, a seat hole of the hinge seat extends in the front-rear direction, and the supporting sliding shoe is hinged to the hinge seat through a pin shaft. The bottom of the support slipper is provided with a front and a rear two support surfaces, a second support surface 65 and a first support surface 64. When the coal face support device is used, the first support surface is supported on a shovel plate of the scraper conveyor, and the second support surface is supported on a bottom plate of the coal face. Compared with the existing supporting sliding shoe with only one supporting surface for supporting on the shovel plate, the supporting sliding shoe has the advantages that the contact area is increased, the specific pressure is reduced, the service life of the supporting sliding shoe is prolonged, and in addition, the supporting position can be moved to the coal wall side due to the fact that the second supporting surface is arranged, and therefore the stability of the thin coal seam coal mining machine adopting a machine body suspending mode can be greatly improved.

In order to adapt to the height difference between the shovel plate and the bottom plate, the first supporting surface is higher than the second supporting surface, and the first supporting surface and the second supporting surface are both provided with wear-resistant layers.

The lower part of the machine body is also provided with a dragging connecting installation groove 28, so that a space is provided for the installation of the dragging connecting device. As shown in fig. 12, the dragging connection device includes a connection plate 51 and a connection hook 52, one end of the connection plate is hinged in the dragging connection installation groove 28 on the machine body through an upper connection pin 53, the diameter of a pin hole on the connection plate for penetrating the upper connection pin is larger than the upper connection pin, the other end of the connection plate is hinged with one end of the connection hook through a lower connection pin 54, the two hinged hinge axes are extended left and right, the other end of the connection hook is set to be a cylindrical structure with the axis extending left and right, the cylindrical structure is arranged in a chain groove of the scraper conveyor 92 and is connected with the chain groove in a sliding manner, and two ends of the cylindrical structure are respectively connected with a dragging chain 922. The dragging chain is applied with pulling force in the left and right directions, and the coal mining machine can be driven to move left and right. The invention adopts the matching of the guide sliding shoes and the dragging connecting device, and because the cutting counter force of the coal mining machine is borne by the guide sliding shoes, the dragging connecting device 5 only bears the pulling force in the left and right directions, the abrasion at the chain groove can be greatly reduced, and the service life of the dragging chain is greatly prolonged.