Two-stage translation platform and cantilever type heading machine

Abstract

The utility model belongs to the technical field of tunneling equipment with drilling or cutting tools, and particularly relates to a two-stage translation platform and a cantilever type tunneling machine. The two-stage translation platform comprises a fixed seat, a first-stage guide structure and a first-stage platform matched with the first-stage guide structure in a guiding mode are arranged on the fixed seat, a second-stage guide structure and a second-stage platform matched with the second-stage guide structure in a guiding mode are arranged on the first-stage platform, and the first-stage guide structure comprises two rows of supporting wheels arranged on the left side and the right side of the fixed seat respectively. Each row of supporting wheels has a set supporting span, supporting wheel grooves matched with the supporting wheels in a guiding mode are formed in the first-stage platform, the left side and the right side of the second-stage platform are each provided with two or more walking wheels, and the second-stage guiding structure comprises walking wheel grooves allowing the walking wheels to move in a guiding mode. The cantilever type heading machine comprises the two-stage translation platform. By arranging the rolling guide matching structure, the friction force generated when the first-stage platform and the second-stage platform move front and back is reduced, and then the effect of reducing energy consumption is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunneling equipment with drilling or cutting tools, in particular to a two-stage translation platform and a cantilever tunneling machine. Background Art

[0002] When using a cantilever tunnel boring machine for construction, support operations such as driving anchor bolts and assembling arch frames are necessary to ensure construction safety. To enable timely support, cantilever tunnel boring machines with integrated support devices have begun to appear in the prior art. Unlike dedicated trolleys for support operations, such as arch frame trolleys and anchor bolt trolleys, cantilever tunnel boring machines have a cutting boom in front, and the support device cannot interfere with the normal operation of the cutting boom. Therefore, the support device on traditional cantilever tunnel boring machines is generally installed behind the cutting boom. When constructing in soft surrounding rock geology, this installation method still has the problem of not being able to provide timely support.

[0003] To address these issues, cantilevered tunnel boring machines (TBMs) have emerged in the prior art, featuring integrated, two-stage, translatable platforms capable of forward and backward movement, with support devices mounted on the platforms. For example, patent application publication number CN116752984A discloses a multifunctional cantilevered tunnel boring machine (TBM) with advance sliding devices (i.e., two-stage translatable platforms) mounted on both sides. These advance sliding devices comprise a primary slide, a primary platform, a secondary slide, and a secondary slide. The primary slide is fixed to the cantilevered tunnel boring machine and acts as a fixed seat. The primary slide can move forward and backward along the primary slide. The secondary slide is fixed to the primary slide and can move forward and backward with the primary slide. The secondary slide can slide forward and backward along the secondary slide. A telescopic robotic arm is mounted on the secondary slide, and a bolting rig is mounted on the telescopic robotic arm. By installing the advance sliding device, the TBM can move the bolting rig forward, ensuring timely support.

[0004] The above-mentioned cantilever tunnel boring machine does not directly disclose the specific structure of the guide cooperation between the first-level slide and the first-level slide seat, and between the second-level slide and the second-level slide seat. Combined with its attached drawings, it is confirmed that there are five groups of front and rear guide blocks (or block-shaped guide structures) on the left and right sides of the first-level slide seat, and the first-level slide moves along the guide blocks, but it does not disclose the specific structure of the guide blocks. In fact, in this field, the guide blocks and the slides that cooperate with them are generally in a sliding cooperation relationship. However, the weight and volume of the tunnel support device are generally large, and the friction between the first-level slide and the first-level slide seat is large. Pushing and pulling the first-level slide back and forth requires a large force, and the energy consumption is high. In addition, there is a lot of dust inside the tunnel, and dust entering the guide blocks is difficult to clean, which can easily cause the guide blocks and slides to get stuck, and the reliability is also insufficient. Utility Model Content

[0005] The purpose of the present invention is to provide a two-stage translation platform to solve the technical problems of high energy consumption and low reliability of two-stage translation platforms in the prior art. The purpose of the present invention is also to provide a cantilevered roadheader to solve the same technical problems.

[0006] To achieve the above objectives, the technical solution of the two-stage translation platform provided by the present invention is:

[0007] A two-stage translation platform includes a fixed seat, a first-level guide structure and a first-level platform that cooperates with the first-level guide structure for guidance on the fixed seat, a second-level guide structure and a second-level platform that cooperates with the second-level guide structure for guidance on the first-level guide structure, the first-level guide structure includes two rows of support wheels respectively arranged on the left and right sides of the fixed seat, and each row of support wheels has a set support span, the first-level platform is provided with a support wheel groove that cooperates with the support wheel guidance, the left and right sides of the secondary platform are respectively provided with two or more walking wheels, and the secondary guide structure includes a walking wheel groove for guiding the walking wheel to move.

[0008] As a further improvement, the first-level platform includes support vertical plates located on the left and right sides, the support wheel grooves are respectively arranged on the opposite or opposite sides of the two support vertical plates, and the walking wheel grooves are arranged on the same side as the support wheel grooves.

[0009] As a further improvement, first auxiliary limit blocks are provided on the left and right sides of the fixed seat. The first auxiliary limit blocks are provided with a first limit structure that cooperates with the lower groove side wall of the support wheel groove to limit the left and right and up and down positions of the first-level platform.

[0010] As a further improvement, the first limiting structure is composed of a sliding block with a set thickness provided on the first auxiliary limiting block.

[0011] As a further improvement, at least one first auxiliary limiting block is provided between two adjacent support wheels in a corresponding row of support wheels.

[0012] As a further improvement, second auxiliary limit blocks are provided on the left and right sides of the secondary platform. The second auxiliary limit blocks are provided with a second limit structure that cooperates with the upper groove side wall of the walking wheel groove to limit the left and right and up and down positions of the secondary slide.

[0013] As a further improvement, the second limiting structure is composed of a sliding block with a set thickness provided on the second auxiliary limiting block.

[0014] As a further improvement, two rows of support wheels are provided at the front end of the fixed seat, and the rear end of the fixed seat is also provided with a support structure for supporting the rear end of the first-level platform.

[0015] As a further improvement, the support wheels in each column of support wheels are installed in the following manner: every two support wheels are installed on the fixed seat through the same wheel frame.

[0016] As a further improvement, the driving device that drives the secondary platform along the secondary guide structure is a double-range cylinder assembly, which includes a cylinder and a chain assembly. The chain assembly includes four sprockets installed on the cylinder barrel of the cylinder and a chain that bypasses the sprockets. Among the four sprockets, two are arranged in pairs on the left and right sides of the cylinder barrel. There are two chains and they bypass the sprockets on the corresponding sides respectively. The piston rod of the cylinder is connected to the primary platform, and the cylinder barrel cooperates with the front and rear guides of the primary platform. The sprocket divides the chain into two opposite sides, one side is connected to the secondary platform, and the other side is fixed to the primary platform. When the cylinder barrel moves, the chain rotates in a circular direction and drives the secondary platform to move from one end of the cylinder barrel to the other end.

[0017] This utility model is an improved invention, and its beneficial effects are as follows: the guiding relationship between the primary platform and the fixed seat in the utility model is a rolling relationship formed by the support wheels and the support wheel grooves, and the guiding relationship between the secondary platform and the primary platform is a rolling relationship formed by the running wheels and the running wheel grooves. Compared with sliding cooperation, this rolling relationship has less friction while ensuring the support and guiding effects, thereby reducing the energy consumption of the primary and secondary platforms moving forward and backward. At the same time, after general dust enters the support wheel groove or the running wheel groove, due to the line contact between the support wheel and the support wheel groove, and the running wheel and the running wheel groove, the support wheel or the running wheel can also pass over and move normally. It is also easy to clean after construction is completed, has higher reliability, and is more suitable for tunnel construction in harsh environments.

[0018] To achieve the above-mentioned purpose, the technical solution of the cantilever type roadheader provided by the present utility model is:

[0019] A cantilever tunnel boring machine comprises a two-stage translation platform arranged on the cantilever tunnel boring machine body, the two-stage translation platform comprises a fixed seat, the fixed seat is provided with a primary guide structure and a primary platform that cooperates with the primary guide structure for guidance, the primary platform is provided with a secondary guide structure and a secondary platform that cooperates with the secondary guide structure for guidance, the primary guide structure comprises two rows of support wheels respectively arranged on the left and right sides of the fixed seat, and each row of support wheels has a set support span, the primary platform is provided with a support wheel groove that cooperates with the support wheel guidance, the left and right sides of the secondary platform are respectively provided with two or more walking wheels, and the secondary guide structure comprises a walking wheel groove for guiding the walking wheel to move.

[0020] As a further improvement, the first-level platform includes support vertical plates located on the left and right sides, the support wheel grooves are respectively arranged on the opposite or opposite sides of the two support vertical plates, and the walking wheel grooves are arranged on the same side as the support wheel grooves.

[0021] As a further improvement, first auxiliary limit blocks are provided on the left and right sides of the fixed seat. The first auxiliary limit blocks are provided with a first limit structure that cooperates with the lower groove side wall of the support wheel groove to limit the left and right and up and down positions of the first-level platform.

[0022] As a further improvement, the first limiting structure is composed of a sliding block with a set thickness provided on the first auxiliary limiting block.

[0023] As a further improvement, at least one first auxiliary limiting block is provided between two adjacent support wheels in a corresponding row of support wheels.

[0024] As a further improvement, second auxiliary limit blocks are provided on the left and right sides of the secondary platform. The second auxiliary limit blocks are provided with a second limit structure that cooperates with the upper groove side wall of the walking wheel groove to limit the left and right and up and down positions of the secondary slide.

[0025] As a further improvement, the second limiting structure is composed of a sliding block with a set thickness provided on the second auxiliary limiting block.

[0026] As a further improvement, two rows of support wheels are provided at the front end of the fixed seat, and the rear end of the fixed seat is also provided with a support structure for supporting the rear end of the first-level platform.

[0027] As a further improvement, the support wheels in each column of support wheels are installed in the following manner: every two support wheels are installed on the fixed seat through the same wheel frame.

[0028] As a further improvement, the driving device that drives the secondary platform along the secondary guide structure is a double-range cylinder assembly, which includes a cylinder and a chain assembly. The chain assembly includes four sprockets installed on the cylinder barrel of the cylinder and a chain that bypasses the sprockets. Among the four sprockets, two are arranged in pairs on the left and right sides of the cylinder barrel. There are two chains and they bypass the sprockets on the corresponding sides respectively. The piston rod of the cylinder is connected to the primary platform, and the cylinder barrel cooperates with the front and rear guides of the primary platform. The sprocket divides the chain into two opposite sides, one side is connected to the secondary platform, and the other side is fixed to the primary platform. When the cylinder barrel moves, the chain rotates in a circular direction and drives the secondary platform to move from one end of the cylinder barrel to the other end.

[0029] This utility model is an improved invention, and its beneficial effects are as follows: the guiding relationship between the primary platform and the fixed seat in the utility model is a rolling relationship formed by the support wheels and the support wheel grooves, and the guiding relationship between the secondary platform and the primary platform is a rolling relationship formed by the running wheels and the running wheel grooves. Compared with sliding cooperation, this rolling relationship has less friction while ensuring the support and guiding effects, thereby reducing the energy consumption of the primary and secondary platforms moving forward and backward. At the same time, after general dust enters the support wheel groove or the running wheel groove, due to the line contact between the support wheel and the support wheel groove, and the running wheel and the running wheel groove, the support wheel or the running wheel can also pass over and move normally. It is also easy to clean after construction is completed, has higher reliability, and is more suitable for tunnel construction in harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural diagram of an embodiment of a two-stage translation platform in the present utility model;

[0031] Figure 2 for Figure 1 Axonometric drawing of the middle fixed seat and the first-level platform;

[0032] Figure 3 A longitudinal sectional view (axonometric view) of an embodiment of a secondary translation platform in the present utility model;

[0033] Figure 4 A longitudinal sectional view (front view) of an embodiment of a two-stage translation platform in the present utility model;

[0034] Figure 5 for Figure 1 Front view of the middle fixed seat and the first-level platform;

[0035] Figure 6 for Figure 1 Schematic diagram of the structure of the middle support wheel and the limit block;

[0036] Figure 7 for Figure 1 Axonometric drawings of the first and second level platforms;

[0037] Figure 8 for Figure 1 Schematic diagram of the structure of the intermediate level platform;

[0038] Figure 9 This is a transverse cross-sectional view of an embodiment of a two-stage translation platform in the present utility model;

[0039] Figure 10 for Figure 1 Axonometric drawing of the secondary platform in.

[0040] Description of reference numerals:

[0041] 1. Fixed seat; 2. First-level platform; 3. Second-level platform; 4. Double-range cylinder assembly; 5. Driving cylinder; 6. Slider; 101. Support wheel group; 102. First auxiliary limit block; 103. Support block; 201. Support wheel groove; 202. Travel wheel groove; 203. Guide rail; 204. Connecting plate; 301. Travel wheel group; 302. Second auxiliary limit block; 401. Chain; 402. Sprocket; 403. Cylinder; 404. Guide seat; 1011. Support wheel frame; 1012. Support wheel; 3011. Travel wheel frame; 3012. Travel wheel. DETAILED DESCRIPTION

[0042] To provide a two-stage translation platform suitable for tunnel construction and with low energy consumption, the basic technical concept of this utility model is to replace the guiding coordination between the primary platform and the fixed base, and between the secondary and primary platforms, with a guidance system based on rollers and wheel grooves. This not only reduces friction during platform forward and backward movement, thus lowering energy consumption, but also mitigates the adverse effects of tunnel dust on platform forward and backward movement, thereby improving reliability. The following describes this utility model in further detail with reference to the following examples.

[0043] The specific embodiment of the two-stage translation platform provided by the utility model is as follows:

[0044] The two-stage translation platform provided in this embodiment is as follows: Figure 1 As shown, it includes a fixed base 1, a primary platform 2, and a secondary platform 3. The fixed base 1 can be installed on tunnel construction equipment such as a cantilevered tunnel boring machine. The primary platform 2 can be guided and moved along the primary guide structure provided on the fixed base 1, that is, the primary platform 2 and the primary guide structure on the fixed base 1 cooperate with each other. The secondary platform 3 can be guided and moved along the secondary guide structure provided on the primary platform 2, that is, the secondary platform 3 and the secondary guide structure on the primary platform 2 cooperate with each other. The secondary platform 3 can be installed with support devices required for tunnel support operations, such as a robotic arm for assembling arch frames and a robotic arm for drilling anchors. By providing a two-stage translation platform that can move forward and backward, this embodiment achieves a larger travel range for the secondary platform 3 while maintaining a relatively small size, thereby enabling the support devices to be moved to a more forward position for timely support. When the cutting boom of the cantilevered tunnel boring machine is operating normally, the secondary platform 3 can also be moved to a more rearward position to avoid the cutting boom.

[0045] Different from the prior art, in this embodiment, the guiding cooperation relationship between the fixing seat 1 and the first-level platform 2, and between the first-level platform 2 and the second-level platform 3 is a "wheel groove" rolling cooperation relationship. Specifically, Figure 1 、 Figure 2 and Figure 5 As shown, the first-level guide structure on the fixed seat 1 includes two rows of support wheels, and the two rows of support wheels are respectively arranged on the left and right sides of the fixed seat 1. A support wheel groove 201 is provided on the first-level platform 2, and the support wheel groove 201 cooperates with the support wheel guide, that is, the support wheel can roll along the support wheel groove 201. In order to ensure that the first-level platform 2 can be reliably supported by the support wheels, each row of support wheels should have a set support span, that is, the distance between the frontmost support wheel and the rearmost support wheel is sufficient to support the first-level platform 2. The number of support wheels included in each row of support wheels is not specifically limited here, but it should be noted that, in extreme cases, in order to ensure the supporting function of the foundation, each row of support wheels may have only two support wheels. As shown Figure 7 and Figure 10As shown, the secondary guide structure on the primary platform 2 includes a running wheel groove 202. Running wheels are provided on the left and right sides of the secondary platform 3, and the running wheels can move along the running wheel groove 202. Similarly, considering the supporting role of the running wheels on the secondary platform 3, at least two running wheels should be provided on each side of the secondary platform 3.

[0046] Analysis of the above structure readily demonstrates that, by providing a rolling guide mechanism, this embodiment reduces friction during the forward and backward movement of the primary and secondary platforms 2 and 3, thereby reducing energy consumption. Furthermore, the support wheels and support wheel grooves 201, as well as the running wheels and running wheel grooves 202, all exhibit line contact, resulting in a relatively small contact area. Dust within the tunnel generally prevents the support and running wheels from becoming stuck, thereby enhancing the reliability of the two-stage translation platform.

[0047] More specifically, if Figure 1 、 Figure 2 、 Figure 5-Figure 7 and Figure 10 As shown, in the present embodiment, every two support wheels 1012 in each column of support wheels are installed on the fixed base 1 by the same support wheel frame 1011. Naturally, the support wheels 1012 also need to have bearings. In other words, two support wheels 1012 and a support wheel frame 1011 constitute the support wheel group 101. The form of this wheel group is convenient for modular assembly. In addition, the running wheel 3012 is also in the form of the running wheel group 301, and the two running wheels 3012 are installed on the secondary platform by the same running wheel frame 3011. In a preferred embodiment, the specifications of the support wheels 1012 and the running wheels 3012 can be the same, so that modular manufacturing and installation can be carried out in batches, and the cost is low.

[0048] Of course, those skilled in the art will appreciate that, in other embodiments, the support wheels 1012 and the travel wheels 3012 may also be independently installed at corresponding positions one by one.

[0049] like Figure 1 、 Figure 2 、 Figure 5-Figure 7 and Figure 9 As shown, in this embodiment, the first-level platform 2 includes support uprights located on the left and right sides. The two support uprights have two opposite sides (inner sides) and two opposite sides. The support wheel grooves 201 can be set on the opposite sides or the opposite sides. Preferably, the support wheel grooves 201 are set on the opposite sides of the support uprights, so that the notches of the support wheel grooves 201 are actually facing outward, which is convenient for removing dust. The walking wheel grooves 202 are set on the same side as the support wheel grooves 201. Compared with the embodiment in which the support wheel grooves 201 are set at the bottom of the first-level platform 2, this design can make the support wheels have the effect of internally supporting the first-level platform 2 or clamping the first-level platform 2, making the guided movement of the first-level platform 2 more stable.

[0050] To further enhance the stability of the guided movement of the primary platform 2, preferably, first auxiliary limit blocks 102 are further provided on the left and right sides of the fixed base 1. These first auxiliary limit blocks 102 are used to limit the left-right (lateral) and up-down (vertical) positions of the primary platform 2. Specifically, the first auxiliary limit blocks 102 are provided with a first limiting structure that cooperates with the lower groove sidewalls of the support wheel groove 201 to thereby limit the position of the primary platform 2 in the aforementioned directions. It should be noted that the auxiliary limit blocks serve as auxiliary limiters, and in reality, the primary platform is primarily supported by the support wheels.

[0051] Specifically, if Figure 6 As shown, a slider 6 is installed on the first auxiliary limiting block 102. The slider 6 is a block structure with a self-lubricating effect, and can be specifically made of brass or nylon. The slider 6 slides with the side wall of the lower groove of the support wheel groove 201 and constitutes a first limiting structure. At the same time, the slider 6 also has a set thickness. When installing the first-level platform 2, a slider 6 with a suitable thickness can be selected according to the actual gap between the limiting block and the support wheel groove 201 to ensure the limiting effect of the first auxiliary limiting block 102. There is a large contact area between the slider 6 and the support wheel groove 201, which can ensure a better limiting effect. Of course, in other embodiments, the first limiting structure can also be composed of a roller installed on the first auxiliary limiting block 102.

[0052] In addition, if Figure 1 and Figure 5 As shown, three first auxiliary limit blocks 102 are provided on each side. The first auxiliary limit blocks 102 are installed between two adjacent support wheels in each row of support wheels. In other words, the first auxiliary limit blocks 102 are installed in the gaps within each row of support wheels. In this case, the two adjacent support wheels can play the primary supporting role, further reducing the pressure on the first auxiliary limit blocks 102 from the primary platform. It is not difficult to understand that, based on the above analysis, in other embodiments, if only one first auxiliary limit block 102 is provided, it is preferably provided between two adjacent support wheels.

[0053] like Figure 7 and Figure 10 As shown, second auxiliary stoppers 302 are provided on the left and right sides of the secondary platform 3. These second auxiliary stoppers 302 include a second limiting structure that cooperates with the upper groove sidewalls of the running wheel groove 202 to limit the left and right and vertical positions of the secondary slide. Similarly, the second limiting structure can be formed by a slider 6 of a predetermined thickness mounted on the second auxiliary stoppers 302.

[0054] like Figure 2 and Figure 5As shown, in some embodiments, support wheels are located at the front end of the fixed base 1. To ensure that the primary platform 2 is stably supported when the primary and secondary platforms 2 and 3 are retracted, a support structure is further provided at the rear end of the fixed base 1 to support the rear end of the primary platform 2. Specifically, the support structure may be a support block 103. Of course, in other embodiments, the front-to-back span of each row of support wheels may be appropriately increased to ensure that the primary platform 2 is stably supported both when extended forward and when retracted.

[0055] Of course, there are driving devices connected between the first-level platform 2 and the fixed seat 1, and between the second-level platform 3 and the first-level platform 2. Figure 3 and Figure 4 As shown, the driving device connected between the first-level platform 2 and the fixed base 1 can be a telescopic device, such as a driving cylinder 5 that can be telescopic in two stages. Figure 7 and Figure 8 As shown, the drive device connecting the secondary platform 3 and the primary platform 2 is a double-range cylinder assembly 4. The double-range cylinder assembly 4 includes a cylinder and a chain assembly mounted on the cylinder barrel 403. The cylinder's piston rod is connected to the primary platform 2, and the cylinder barrel 403 cooperates with the primary platform 2 for front and rear guidance. The chain assembly includes four sprockets 402 and a chain 401 that passes around the sprockets 402. Two of the four sprockets 402 are located on the left side of the cylinder barrel 403, and two are located on the right side of the cylinder barrel 403. The sprockets 402 divide the chain 401 into two opposite sides, one connected to the secondary platform 3 and the other to the primary platform 2. The chain 401 is connected to the primary and secondary platforms 2 and 3 via an accessory bracket. Correspondingly, the primary platform 2 is equipped with a connecting plate 204 connected to the cylinder rod and a guide rail 203 that cooperates with the guide seat 404 mounted on the cylinder barrel 403. When the cylinder barrel 403 of the oil cylinder is extended, the chain 401 will also rotate, thereby causing the secondary platform 3 to move from one end of the cylinder barrel 403 to the other end, achieving the effect of multiplying the oil cylinder stroke, thereby sending the secondary platform 3 to a more forward position while maintaining a compact size.

[0056] Specific embodiment of the cantilever type roadheader in the utility model:

[0057] The cantilever tunnel boring machine body is equipped with a two-stage translation platform as described in the above-mentioned embodiment of the two-stage translation platform, which will not be described in detail here.

[0058] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A two-stage translation platform, comprising a fixed seat, a primary guide structure and a primary platform provided on the fixed seat for guiding with the primary guide structure, a secondary guide structure and a secondary platform provided on the primary platform for guiding with the secondary guide structure, characterized in that: The first-level guide structure includes two rows of support wheels respectively arranged on the left and right sides of the fixed seat, and each row of support wheels has a set support span. The first-level platform is provided with a support wheel groove that cooperates with the support wheel guide. The left and right sides of the second-level platform are respectively provided with more than two walking wheels, and the second-level guide structure includes a walking wheel groove for guiding the movement of the walking wheel.

2. The two-stage translation platform according to claim 1, characterized in that: The first-level platform includes support vertical plates on the left and right sides, and the support wheel grooves are respectively arranged on the opposite or opposite sides of the two support vertical plates, and the walking wheel grooves are arranged on the same side as the support wheel grooves.

3. The two-stage translation platform according to claim 2, characterized in that: A first auxiliary limit block is provided on the left and right sides of the fixing seat. The first auxiliary limit block is provided with a first limit structure that cooperates with the lower groove side wall of the supporting wheel groove to limit the left and right and up and down positions of the first-level platform.

4. The two-stage translation platform according to claim 3, characterized in that: The first limiting structure is composed of a sliding block with a set thickness which is arranged on the first auxiliary limiting block.

5. The two-stage translation platform according to claim 3 or 4, characterized in that: At least one first auxiliary limiting block is provided between two adjacent support wheels in a corresponding row of support wheels.

6. The two-stage translation platform according to any one of claims 2 to 4, characterized in that: Second auxiliary limit blocks are provided on the left and right sides of the secondary platform. The second auxiliary limit blocks are provided with a second limit structure that cooperates with the upper groove side wall of the walking wheel groove to limit the left and right and up and down positions of the secondary slide.

7. The two-stage translation platform according to claim 6, characterized in that: The second limiting structure is composed of a sliding block with a set thickness which is arranged on the second auxiliary limiting block.

8. The two-stage translation platform according to any one of claims 1 to 4, characterized in that: Two rows of supporting wheels are arranged at the front end of the fixed seat, and the rear end of the fixed seat is also provided with a supporting structure for supporting the rear end of the first-level platform.

9. The two-stage translation platform according to any one of claims 1 to 4, characterized in that: The supporting wheels in each column of supporting wheels are installed in the following manner: every two supporting wheels are installed on the fixing seat through the same wheel frame.

10. The two-stage translation platform according to any one of claims 1 to 4, characterized in that: The driving device that drives the secondary platform along the secondary guide structure is a double-range cylinder assembly, which includes a cylinder and a chain assembly. The chain assembly includes four sprockets installed on the cylinder barrel of the cylinder and a chain that passes around the sprockets. Among the four sprockets, two are arranged in pairs on the left and right sides of the cylinder barrel. There are two chains and they pass around the sprockets on the corresponding sides respectively. The piston rod of the cylinder is connected to the primary platform, and the cylinder barrel cooperates with the front and rear guides of the primary platform. The sprocket divides the chain into two opposite sides, one side of which is connected to the secondary platform and the other side is fixed to the primary platform. When the cylinder barrel moves, the chain rotates in a circular direction and drives the secondary platform to move from one end of the cylinder barrel to the other end.

11. A cantilever type roadheader, comprising a two-stage translation platform provided on a cantilever type roadheader body, characterized in that: The two-stage translation platform is the two-stage translation platform described in any one of claims 1-10.

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