Coal cutter walking box assembly and combined coal cutter walking box series

Abstract

The invention relates to a walking box assembly of a coal mining machine and a combined walking box series of the coal mining machine. The former comprises upper and lower shells and a transition frame. The upper and lower shells are both box structures with a through cavity. A pair of one-axle assembly mounting holes and a pair of two-axle assembly mounting holes are arranged on the front and rear sidewalls of the upper shell. Only a pair of one-axle assembly mounting holes or a pair of one-axle assembly mounting holes and a pair of two-axle assembly mounting holes are arranged on the front and rear sidewalls of the lower shell. The latter comprises walking boxes of the coal mining machine with high, medium and low heights. The walking box with the low height only uses the upper shell. The walking boxes with the medium and high heights simultaneously use the upper and lower shells and the transition frame. The upper shell is detachably fixed on the rear end surface of the traction part shell. The transition frame is detachably fixed below the traction part shell. The lower shell is detachably fixed on the rear end surface of the transition frame. The invention can realize flexible adjustment of the overall height of the walking box and reduce the production cost.

Description

Technical Field

[0001] This invention relates to a coal mining machine traveling box, particularly a coal mining machine traveling box with a longitudinally split structure, whose height can be changed by modular disassembly and reassembly. Background Technology

[0002] Coal mining machines are key equipment in coal production, and the traveling box is a crucial component of these machines. Coal mining machines require traveling boxes of varying heights depending on the coal seam thickness. Due to the diversity of coal seam occurrences, the same coal mining machine may need to be equipped with traveling boxes of multiple specifications. The traveling box shell is generally a one-piece casting structure. The more traveling box specifications a single coal mining machine requires, the more wooden molds and clay cores need to be manufactured for casting the traveling box shell, increasing costs. Furthermore, the workload of disassembly and assembly is also greater when changing specifications. Summary of the Invention

[0003] The present invention aims to provide a coal mining machine traveling box assembly and a series of combined coal mining machine traveling boxes, which can flexibly adjust the overall height of the traveling box by adding or removing modules, while also reducing production costs.

[0004] The main technical solutions of this invention are as follows:

[0005] A coal mining machine traveling box assembly includes an upper shell, a lower shell, and a transition frame. Both the upper and lower shells are box structures with vertically connected internal cavities. The outer side of the front wall of the upper shell serves as an installation reference surface, on which are provided two upper and lower upper shell circular positioning stops. Simultaneously, the front and rear side walls of the upper shell are provided with a pair of one-axis assembly mounting holes and a pair of two-axis assembly mounting holes from top to bottom, respectively. The outer side of the front wall of the lower shell serves as an installation reference surface, on which are provided two lower shell circular positioning stops. Simultaneously, the front and rear side walls of the lower shell are provided with only a pair of one-axis assembly mounting holes or a pair of one-axis assembly mounting holes and a pair of two-axis assembly mounting holes from top to bottom, respectively. The top surface of the transition frame serves as an installation reference surface. The top of the transition frame is provided with a circular positioning disc extending vertically along its axis and two vertical plates located on the left and right sides of the circular positioning disc. Both the positioning disc and the vertical plates protrude upwards from the top surface. The vertical plates are provided with pin holes extending vertically and penetrating through the structure. The rear end face of the transition frame serves as a positioning surface, on which are provided two upper and lower transition frame circular positioning stops that correspond one-to-one with and cooperate with the circular positioning stops of the lower shell.

[0006] The upper and lower housing circular positioning stops are coaxially set with the mounting holes of the first and second shaft components on the upper housing, respectively. When the lower housing has a pair of mounting holes of the first and second shaft components and a pair of mounting holes of the second shaft components, the upper and lower housing circular positioning stops are coaxially set with the mounting holes of the first and second shaft components on the lower housing, respectively. When the lower housing has only a pair of mounting holes of the first shaft components, the lower housing circular positioning stop is coaxially set with the mounting hole of the first shaft component on the lower housing.

[0007] Both the upper and lower housing circular positioning stops are convex stops, while the transition frame circular positioning stop is a concave stop.

[0008] When the lower housing has a pair of one-axis assembly mounting holes and a pair of two-axis assembly mounting holes, the bottom surface of the upper and lower transition frame circular positioning stops is provided with threaded holes coaxial with the corresponding stops. When the lower housing has only a pair of one-axis assembly mounting holes, the bottom surface of the lower transition frame circular positioning stop is provided with threaded holes coaxial with the corresponding stops.

[0009] The transition frame has several threaded holes on its left and right sides respectively; the upper housing has several screw holes on its upper left and right sides respectively, and several bolt holes on its lower left and right sides respectively; the lower housing has several bolt holes on its left and right sides respectively.

[0010] The upper and lower shells, which are assembled into the same traveling box, have equal widths in the left-right direction and equal thicknesses in the front-back direction.

[0011] The upper shell can be formed by casting or by welding plates, and the lower shell can be formed by casting or by welding plates.

[0012] A series of modular coal mining machine travel boxes includes three height settings (high, medium, and low) obtained by assembling the aforementioned travel box components. The low-height travel box uses only the upper housing. A drive wheel assembly is installed at the mounting hole of the first axle assembly within the upper housing, and a single-row or double-row travel wheel assembly is installed at the mounting hole of the second axle assembly. When the single-row travel wheel assembly is installed, the drive wheel in the drive wheel assembly meshes externally with the travel wheel in the travel wheel assembly. When the double-row travel wheel assembly is installed, the drive wheel in the drive wheel assembly meshes externally with the large gear in the travel wheel assembly. The large gear in the component rotates synchronously with the traveling wheel on the same axis; the coal mining machine traveling box with a medium height uses the aforementioned upper shell, lower shell, and transition frame. The lower shell has only one pair of shaft assembly mounting holes. The upper shell has a drive wheel assembly and an idler wheel assembly installed at the shaft assembly mounting holes and the second shaft assembly mounting holes, respectively. The lower shell has a single-row or double-row traveling wheel assembly installed at the shaft assembly mounting holes. When a single-row traveling wheel assembly is installed, the idler wheel in the idler wheel assembly simultaneously meshes with both the drive wheel in the drive wheel assembly and the traveling wheel in the traveling wheel assembly. When a double-row traveling wheel assembly is installed, the idler wheel assembly… The idler gear in the upper housing meshes externally with both the drive wheel in the drive wheel assembly and the large gear in the traveling wheel assembly. The high-end coal mining machine traveling box utilizes the aforementioned upper housing, lower housing, and transition frame. The lower housing has a pair of one-axis assembly mounting holes and a pair of two-axis assembly mounting holes. The drive wheel assembly and the first idler gear assembly are respectively installed at the one-axis assembly mounting holes and the two-axis assembly mounting holes in the upper housing. The second idler gear assembly and the traveling wheel assembly are respectively installed at the one-axis assembly mounting holes and the two-axis assembly mounting holes in the lower housing. The traveling wheel assembly is either a single-row traveling wheel assembly or a double-row traveling wheel assembly. When a single-row traveling wheel assembly is installed... When the drive wheel assembly, the drive wheel, the first idler wheel, the second idler wheel, and the travel wheel in the travel wheel assembly are sequentially meshed from top to bottom. When the double-row travel wheel assembly is installed, the drive wheel, the first idler wheel, the second idler wheel, and the large gear in the travel wheel assembly are sequentially meshed from top to bottom. The upper housing is detachably fixed to the rear end face of the traction unit housing. The transition frame is detachably fixed to the lower part of the traction unit housing, and the lower housing is detachably fixed to the rear end face of the transition frame.

[0013] The upper housing is positioned onto the traction housing via the outer side of its front sidewall and the circular positioning stop of the upper housing; the transition frame is positioned onto the traction housing via its top surface, the circular positioning disc, and the pin passing through the pin hole on the vertical plate; and the lower housing is positioned onto the transition frame via the outer side of its front sidewall and the circular positioning stop of the lower housing.

[0014] An upper pad is provided between the traction unit housing and the upper housing, and a lower pad is provided between the transition frame and the lower housing. The upper and lower pads each have various thickness specifications. For the coal mining machine traveling box with medium and high height, the installed upper and lower pads are of equal thickness.

[0015] The beneficial effects of this invention are:

[0016] By changing the traditional integral walking box shell into a longitudinally split modular combination box structure, the various components inside the walking box can be modularly combined according to different height requirements, thereby achieving flexible height adjustment.

[0017] For high-height coal mining machine travel boxes, since multiple travel box components are combined into a complete travel box, the volume of each component is significantly smaller than that of a traditional one-piece travel box. This reduces the difficulty of disassembling and assembling travel box parts, improves maintainability, and the reduced size makes it more suitable for plate welding, which helps reduce production costs and shorten the production cycle compared to casting. Since some modules are interchangeable across travel boxes of different heights, changing the travel box height can also reduce the amount of disassembly and assembly work.

[0018] Because of the increased adaptability of the longitudinal split-type coal mining machine traveling box of the present invention, manufacturers can put it into mass production in advance to meet the diverse needs of users, and the inventory clearance cycle is fast with less capital tied up; for users, this can also reduce the cost of modification and shorten the modification cycle. Attached Figure Description

[0019] Figures 1a-1d These are, respectively, a front view, a top view, a left view, and a longitudinal sectional view of one embodiment of the upper housing;

[0020] Figures 2a-2d These are, respectively, a front view, a top view, a left view, and a longitudinal sectional view of one embodiment of the lower housing;

[0021] Figures 3a-3c These are, respectively, a front view, a top view, and an AA-step sectional view of one embodiment of the transition frame;

[0022] Figure 4 A schematic diagram showing the installation and connection of the transition frame and the lower shell;

[0023] Figure 5a , 5b These are, respectively, a front view and a longitudinal sectional view of an embodiment of a coal mining machine travel box with a low height setting;

[0024] Figure 6a , 6b These are, respectively, a front view and a longitudinal sectional view of an embodiment of a coal mining machine travel box with a medium height.

[0025] Figure 7a , 7b These are, respectively, a front view and a longitudinal sectional view of an embodiment of a coal mining machine traveling box with a high height.

[0026] Figure 8 This is a schematic diagram of the installation structure of the double-row walking wheel assembly (including guide shoes);

[0027] Figure 9 This is a schematic diagram of the installation structure of the traveling box of a coal mining machine with a low height setting and equipped with a pad.

[0028] Reference numerals: 1. Upper housing; 101. Circular locating stop of upper housing; 102. Mounting hole for first-axis assembly; 103. Mounting hole for second-axis assembly; 104. Screw hole; 105. Bolt hole;

[0029] 2. Lower housing; 201. Circular locating stop of the lower housing; 202. Mounting hole for the shaft assembly; 204. Bolt hole;

[0030] 3. Transition frame; 301. Circular positioning plate; 302. Vertical plate; 3021. Pin hole; 303. Circular positioning stop of transition frame; 304. Threaded hole; 305. Threaded hole;

[0031] 4. Drive wheel assembly;

[0032] 501. Idler wheel assembly; 502. First idler wheel assembly; 503. Second idler wheel assembly;

[0033] 6. Walking wheel assembly (including guide shoes);

[0034] 7. Pin;

[0035] 8. Traction unit housing;

[0036] 9. Pad. Detailed Implementation

[0037] This invention discloses a coal mining machine traveling box assembly, such as... Figures 1a-9 As shown, it includes an upper shell 1, a lower shell 2, and a transition frame 3. Both the upper and lower shells are box structures with vertically connected internal cavities. The internal cavities of the upper and lower shells are used to install the transmission system of the coal mining machine's traveling mechanism.

[0038] The outer surface of the front sidewall of the upper housing serves as its mounting reference surface. This surface has two upper housing circular positioning stops 101. The mounting reference surface and the upper housing circular positioning stops are the positioning connection structures used to install the upper housing onto the coal mining machine. From top to bottom, the front and rear sidewalls of the upper housing have a pair of single-axis assembly mounting holes 102 and a pair of two-axis assembly mounting holes 103, respectively. The single-axis assembly mounting holes 102 are used to install the drive wheel assembly 4, and the two-axis assembly mounting holes 103 are used to install the traveling wheel assembly 6 (including guide shoes, the same below) or idler wheel assembly. The upper housing can be configured in several specifications according to the different center distances of the single-axis assembly mounting holes 102 and the two-axis assembly mounting holes 103.

[0039] The outer surface of the front sidewall of the lower housing serves as its mounting reference surface. This surface has two circular positioning stops 201 for the lower housing. The mounting reference surface and the circular positioning stops are the positioning connection structures used to install the lower housing onto the coal mining machine. The front and rear sidewalls of the lower housing have only one pair of single-shaft assembly mounting holes 202 (this type of lower housing is simply called a single-shaft lower housing), or from top to bottom, one pair of single-shaft assembly mounting holes and one pair of two-shaft assembly mounting holes (this type of lower housing is simply called a two-shaft lower housing, see [link]). Figure 7b The lower housing has one pair of single-axle assembly mounting holes 202 on its front and rear side walls, used to mount the traveling wheel assembly 6; the lower housing also has one pair of single-axle assembly mounting holes and one pair of double-axle assembly mounting holes from top to bottom on its front and rear side walls, respectively. The single-axle assembly mounting holes are used to mount the idler wheel assembly, and the double-axle assembly mounting holes are used to mount the traveling wheel assembly 6. For the double-axle lower housing, several specifications can be set according to the different center distances of the single-axle assembly mounting holes and the double-axle assembly mounting holes.

[0040] The drive wheel assembly, idler wheel assembly, and travel wheel assembly can use corresponding components of existing structures. In addition to the gears used as drive wheels, idler wheels, or travel wheels, they typically include axles, bearings, bearing housings, bearing end caps, seals, etc.

[0041] The top surface of the transition frame serves as its installation reference surface. The top of the transition frame features a circular positioning disc 301 extending vertically along its axis and two vertical plates 302 located on either side of the circular positioning disc. Both the positioning disc and the vertical plates protrude upwards from the top surface. The vertical plates have through pin holes 3021 extending forward and backward. The top surface, circular positioning disc, and pin holes of the transition frame constitute the positioning and connection structure for installing the transition frame onto the coal mining machine. The rear end face of the transition frame serves as the positioning and connection surface for installing the lower housing. This surface has two circular positioning stops 303, one above the other, that correspond one-to-one with and cooperate with the circular positioning stops 201 of the lower housing.

[0042] In the installed state, the transition frame is installed below the traction unit housing of the coal mining machine (hereinafter referred to as traction unit housing 8) (see...). Figure 4The upper and lower housings are respectively mounted on the rear end faces of the traction unit housing and the transition frame. There is no contact between the upper and lower housings.

[0043] The upper shell, lower shell, and transition frame are preferably symmetrical structures.

[0044] As a preferred technical solution, the two circular positioning stops of the upper and lower housings are coaxially set with the mounting holes of the first and second shaft components on the upper housing, respectively; when the lower housing has a pair of mounting holes of the first and second shaft components and a pair of mounting holes of the second shaft components, the two circular positioning stops of the lower housings are coaxially set with the mounting holes of the first and second shaft components on the lower housing, respectively; when the lower housing has only a pair of mounting holes of the first shaft components, the circular positioning stop of the lower housing located below is coaxially set with the mounting hole of the first shaft component on the lower housing.

[0045] The upper shell circular positioning stop 101 and the lower shell circular positioning stop 201 are preferably convex stops, and the transition frame circular positioning stop 303 is a concave stop.

[0046] When the lower housing has a pair of one-axis assembly mounting holes and a pair of two-axis assembly mounting holes, the bottom surface of the circular positioning stops of both the upper and lower transition frames has threaded holes 304 coaxial with the corresponding stops. When the lower housing has only a pair of one-axis assembly mounting holes, the bottom surface of the circular positioning stop of the lower transition frame has threaded holes 304 coaxial with the corresponding stops. The threaded holes 304 are used for bolt connection when installing the traveling wheel assembly or idler wheel assembly on the lower housing. The corresponding bolts are used to pass through the axle in the corresponding assembly along the axis and fix the corresponding axle to the transition frame.

[0047] The transition frame has several threaded holes 305 on its left and right sides for mounting bolts to secure the lower housing. The upper housing has several screw holes 104 on its upper left and right sides, and several bolt holes 105 on its lower left and right sides. The screw holes 104 and bolt holes 105 are used to pass screws and hydraulic bolts to secure the upper housing. The lower housing has several bolt holes 204 on its left and right sides for passing hydraulic bolts to secure the lower housing to the transition frame.

[0048] The upper and lower shells, which are usually assembled into the same traveling box, have equal width in the left-right direction and equal thickness in the front-back direction.

[0049] The upper shell can be formed by casting or by welding plates, and similarly, the lower shell can be formed by casting or by welding plates. For the taller coal mining machine travel box, since multiple coal mining machine travel box components are combined into a complete coal mining machine travel box, the volume of a single component is significantly smaller than that of a traditional integral travel box. Therefore, it is suitable to use plate welding, which is more advantageous than casting in reducing production costs and shortening the production cycle.

[0050] This invention also discloses a series of combined coal mining machine traveling boxes, such as... Figures 5a-7b As shown, the coal mining machine travel box includes three height levels (high, medium, and low) obtained by assembling and installing the coal mining machine travel box assembly.

[0051] Coal mining machine travel box with low height setting (see Figure 5a , 5b Only the upper housing 1 is used. Drive wheel assembly 4 and traveling wheel assembly 6 are respectively installed at the mounting holes for the first and second axle components within the upper housing. The traveling wheel assembly 6 can be a single-row or double-row traveling wheel assembly. For example... Figure 8 As shown, the double-row walking wheel assembly adds a large gear compared to the single-row walking wheel assembly. The large gear is coaxial with the walking wheels and rotates synchronously. The walking wheels are used to mesh with the pinion assembly. When the single-row walking wheel assembly is installed, the drive wheel in the drive wheel assembly meshes externally with the walking wheels in the walking wheel assembly; when the double-row walking wheel assembly is installed, the drive wheel in the drive wheel assembly meshes externally with the large gear.

[0052] Coal mining machine travel box with a height of medium range (see...) Figure 6a , 6b Simultaneously employing the upper housing 1, lower housing 2, and transition frame 3, the lower housing is a housing with only one pair of single-axis assembly mounting holes. Drive wheel assembly 4 and idler wheel assembly 501 are respectively installed at the single-axis assembly mounting holes and the double-axis assembly mounting holes in the upper housing, while travel wheel assembly 6 is installed at the single-axis assembly mounting hole in the lower housing. When a single row of travel wheel assemblies is installed, the idler wheel in the idler wheel assembly 501 simultaneously meshes with both the drive wheel in the drive wheel assembly and the travel wheel in the travel wheel assembly; when a double row of travel wheel assemblies is installed, the idler wheel in the idler wheel assembly 501 simultaneously meshes with both the drive wheel in the drive wheel assembly and the large gear in the travel wheel assembly.

[0053] The height of the high-end coal mining machine travel box (see...) Figure 7a , 7bSimultaneously employing the upper housing 1, lower housing 2, and transition frame 3, the lower housing is provided with a pair of one-axis assembly mounting holes and a pair of two-axis assembly mounting holes. The drive wheel assembly 4 and the first idler wheel assembly 502 are respectively installed at the one-axis assembly mounting holes and the two-axis assembly mounting holes in the upper housing. The second idler wheel assembly 503 and the traveling wheel assembly 6 are respectively installed at the one-axis assembly mounting holes and the two-axis assembly mounting holes in the lower housing. The traveling wheel assembly 6 can be a single-row traveling wheel assembly or a double-row traveling wheel assembly. When a single-row traveling wheel assembly is installed, the drive wheel in the drive wheel assembly, the first idler wheel in the first idler wheel assembly, the second idler wheel in the second idler wheel assembly, and the traveling wheel in the traveling wheel assembly mesh externally from top to bottom. When a double-row traveling wheel assembly is installed, the drive wheel in the drive wheel assembly, the first idler wheel in the first idler wheel assembly, the second idler wheel in the second idler wheel assembly, and the large gear in the traveling wheel assembly mesh externally from top to bottom.

[0054] The upper housing is detachably and fixedly connected to the rear end face of the traction unit housing, the transition frame is detachably and fixedly connected to the lower part of the traction unit housing, and the lower housing is detachably and fixedly connected to the rear end face of the transition frame.

[0055] The advantage of using a double-row walking wheel assembly is that it can improve the stress condition of the walking wheels, and the module of the drive wheel, idler wheel, and large gear can be different from that of the walking wheels (the module of the walking wheels is non-standard). When the pitch of the matching scraper conveyor is selected to be of a different specification, only the walking wheels of a different module need to be replaced to adapt to the new pitch. The drive wheel, idler wheel, and large gear can remain unchanged, thus saving modification costs.

[0056] Furthermore, the upper housing can be positioned onto the traction housing via the outer side of its front sidewall and the circular positioning stop of the upper housing, and then fixed to the traction housing by multiple upper screws and multiple lower hydraulic bolts. The transition frame is positioned onto the traction housing via its top surface, the circular positioning disc, and the pin 7 passing through the pin hole on the vertical plate, and then fixed to the bottom of the traction housing by several screws. The positioning circular holes and pin holes on the traction housing for mates with the circular positioning disc and the pin 7 are pre-machined. The lower housing is positioned onto the transition frame via the outer side of its front sidewall and the circular positioning stop of the lower housing, and then fixed to the rear end face of the transition frame by multiple screws.

[0057] The installation instructions for the combined coal mining machine traveling box series are as follows:

[0058] 1) When the height of the traveling box required for the coal mining machine is not high, only the upper shell is needed. In this case, the upper shell is installed on the traction unit shell, and the upper shell is positioned using two circular positioning stops. The upper shell is then fixed in the front-to-back direction using screws and hydraulic bolts. The drive wheel assembly 4 is installed at the mounting hole of the first shaft assembly on the upper shell. The traveling wheel assembly 6 (including guide shoes) is pushed into the mounting hole of the second shaft assembly at the lower opening of the upper shell. This completes the installation of the upper shell assembly. The result is as follows... Figure 5a , 5b .

[0059] 2) When the required height of the traveling box is increased, a single-axle lower housing can be added. The specific steps are as follows:

[0060] First, install the upper housing 1 as described above, then install the drive wheel assembly 4 inside the upper housing. Install the idler wheel assembly at the two-axis assembly mounting hole of the upper housing to replace the original travel wheel assembly. Then, install the transition frame 3 below the traction unit, and then install the lower housing onto the transition frame using a method similar to that used to install the upper housing. Finally, push the travel wheel assembly (including guide shoes) 6 into the housing cavity through the opening at the bottom of the lower housing to fix the travel wheel assembly, thus obtaining... Figure 6a , 6b The walking box shown.

[0061] 3) When a higher height is required for the travel box, a two-axle lower housing can be considered. The installation method is basically the same as in 2), except that the first idler wheel assembly 502 is installed at the two-axle assembly mounting hole of the upper housing, the second idler wheel assembly 503 is installed at the one-axle assembly mounting hole of the lower housing, and the travel wheel assembly (including guide shoes) 6 is installed at the two-axle assembly mounting hole. The result is... Figure 7a , 7b The walking box shown.

[0062] Furthermore, a pad can be installed between the coal mining machine body and the traveling box shell. Figure 9 A pad 9 is installed between the traction unit housing and the upper housing. When the traveling box housing includes both upper and lower housings, if an upper pad is installed between the traction unit housing and the upper housing, then a lower pad should also be installed between the transition frame and the lower housing. The upper and lower pads each come in various thicknesses. For medium and high-height coal mining machine traveling boxes, the thickness of the installed upper and lower pads should be equal for the same traveling box assembly. Adding pads between the traction unit and the traveling box, and using pads of different thicknesses, allows adjustment of the width of the coal mining machine body to accommodate scraper conveyors of different widths.

[0063] The term "front" in this article refers to the direction the coal mining machine points towards the coal face while it is in operation.

Claims

1. A coal mining machine traveling box assembly, characterized in that: The system includes an upper shell, a lower shell, and a transition frame. Both the upper and lower shells are box-shaped structures with vertically continuous internal cavities. The outer surface of the front side wall of the upper shell serves as the mounting reference surface, with two circular positioning stops on it. Additionally, the front and rear side walls of the upper shell have a pair of one-axis assembly mounting holes and a pair of two-axis assembly mounting holes, arranged from top to bottom. The outer surface of the front side wall of the lower shell serves as the mounting reference surface, with two circular positioning stops on it. The front and rear side walls of the lower shell have either only a pair of one-axis assembly mounting holes or a pair of one-axis assembly mounting holes and a pair of two-axis assembly mounting holes, arranged from top to bottom. The top surface of the transition frame serves as the mounting reference surface. The top of the transition frame has a circular positioning disc extending vertically along its axis and two... Each upright plate, positioning plate, and upright plate protrude upwards from the top surface. The upright plate has pin holes that extend forward and backward and pass through. The rear end face of the transition frame is the positioning surface, on which there are two transition frame circular positioning stops that correspond one-to-one with and cooperate with the circular positioning stops of the lower housing. The two upper housing circular positioning stops are respectively coaxially set with the mounting holes of the first and second shaft components on the upper housing. When the lower housing has a pair of mounting holes of the first and second shaft components, the two lower housing circular positioning stops are respectively coaxially set with the mounting holes of the first and second shaft components on the lower housing. When the lower housing only has a pair of mounting holes of the first and second shaft components, the lower housing circular positioning stop is coaxially set with the mounting hole of the first shaft component on the lower housing.

2. The coal mining machine traveling box assembly as described in claim 1, characterized in that: Both the upper and lower housing circular positioning stops are convex stops, while the transition frame circular positioning stop is a concave stop.

3. The coal mining machine traveling box assembly as described in claim 2, characterized in that: When the lower housing has a pair of one-axis assembly mounting holes and a pair of two-axis assembly mounting holes, the bottom surface of the upper and lower transition frame circular positioning stops is provided with threaded holes coaxial with the corresponding stops. When the lower housing has only a pair of one-axis assembly mounting holes, the bottom surface of the lower transition frame circular positioning stop is provided with threaded holes coaxial with the corresponding stops.

4. The coal mining machine traveling box assembly as described in claim 3, characterized in that: The transition frame has several threaded holes on its left and right sides respectively; the upper housing has several screw holes on its upper left and right sides respectively, and several bolt holes on its lower left and right sides respectively; the lower housing has several bolt holes on its left and right sides respectively.

5. The coal mining machine traveling box assembly as described in claim 1, 2, 3 or 4, characterized in that: The upper and lower shells, which are assembled into the same traveling box, have equal widths in the left-right direction and equal thicknesses in the front-back direction.

6. The coal mining machine traveling box assembly as described in claim 1, 2, 3 or 4, characterized in that: The upper shell is formed by casting or by welding plates, and the lower shell is formed by casting or by welding plates.

7. A series of combined coal mining machine traveling boxes, characterized in that: The invention includes a coal mining machine traveling box with three height settings (high, medium, and low) obtained by assembling the coal mining machine traveling box assembly as described in claims 1, 2, 3, 4, 5, or 6. The low-height traveling box uses only the upper shell, with a drive wheel assembly installed at the mounting hole of the first axle assembly inside the upper shell, and a single-row or double-row traveling wheel assembly installed at the mounting hole of the second axle assembly. When a single-row traveling wheel assembly is installed, the drive wheel in the drive wheel assembly meshes externally with the traveling wheel in the traveling wheel assembly. When a double-row traveling wheel assembly is installed, the drive wheel in the drive wheel assembly meshes externally with the large gear in the traveling wheel assembly. The large gear in the wheel assembly rotates synchronously and coaxially with the traveling wheel; the coal mining machine traveling box with a medium height uses the aforementioned upper shell, lower shell, and transition frame. The lower shell has only one pair of shaft assembly mounting holes. The upper shell has a drive wheel assembly and an idler wheel assembly installed at the shaft assembly mounting holes and the second shaft assembly mounting holes, respectively. The lower shell has a single-row or double-row traveling wheel assembly installed at the shaft assembly mounting holes. When a single-row traveling wheel assembly is installed, the idler wheel in the idler wheel assembly simultaneously meshes with both the drive wheel in the drive wheel assembly and the traveling wheel in the traveling wheel assembly. When a double-row traveling wheel assembly is installed, the idler wheel assembly… The idler gear in the component meshes externally with both the drive wheel in the drive wheel assembly and the large gear in the traveling wheel assembly; the high-level coal mining machine traveling box uses the aforementioned upper shell, lower shell, and transition frame, wherein the lower shell is equipped with a pair of one-axis assembly mounting holes and a pair of two-axis assembly mounting holes. The drive wheel assembly and the first idler gear assembly are respectively installed at the one-axis assembly mounting holes and the two-axis assembly mounting holes in the upper shell, and the second idler gear assembly and the traveling wheel assembly are respectively installed at the one-axis assembly mounting holes and the two-axis assembly mounting holes in the lower shell. The traveling wheel assembly is a single-row traveling wheel assembly or a double-row traveling wheel assembly. When a single-row traveling wheel assembly is installed... When the drive wheel assembly, the drive wheel, the first idler wheel, the second idler wheel, and the travel wheel in the travel wheel assembly are sequentially meshed from top to bottom. When the double-row travel wheel assembly is installed, the drive wheel, the first idler wheel, the second idler wheel, and the large gear in the travel wheel assembly are sequentially meshed from top to bottom. The upper housing is detachably fixed to the rear end face of the traction unit housing. The transition frame is detachably fixed to the lower part of the traction unit housing, and the lower housing is detachably fixed to the rear end face of the transition frame.

8. The combined coal mining machine traveling box series as described in claim 7, characterized in that: The upper housing is positioned onto the traction housing via the outer side of its front sidewall and the circular positioning stop of the upper housing; the transition frame is positioned onto the traction housing via its top surface, the circular positioning disc, and the pin passing through the pin hole on the vertical plate; and the lower housing is positioned onto the transition frame via the outer side of its front sidewall and the circular positioning stop of the lower housing.

9. The combined coal mining machine traveling box series as described in claim 8, characterized in that: An upper pad is provided between the traction unit housing and the upper housing, and a lower pad is provided between the transition frame and the lower housing. The upper and lower pads each have various thickness specifications. For the coal mining machine traveling box with medium and high height, the installed upper and lower pads are of equal thickness.

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