Driving device of end slope coal mining machine

Abstract

A driving device of an end slope coal mining machine relates to the field of coal mining equipment and comprises a rack, a sliding platform, a cutting roller, a first expansion piece and a spliced multi-section propelling arm, the rack is used for being positioned on the ground, and the sliding platform is connected with the rack through a first expansion piece; the cutting roller is connected with the sliding platform through the propelling arm, and the first expansion piece is used for driving the cutting roller to advance or retreat through the sliding platform and the propelling arm; any two sections of propelling arms in the multiple sections of propelling arms are detachably connected. The device at least has the advantages of being high in automation degree, convenient to assemble and disassemble, small in space size, high in efficiency, fast in dynamic response, stable in operation, reliable in structure, large in mining depth and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coal mining equipment, in particular to an end slope coal mining machine driving device. BACKGROUND In the process of coal mining, many open pit coal end slopes, side slopes, outcrop coal and the like are involved. Due to mining cost and other reasons, these coal resources are difficult to be truly mined on a large scale, and many high-quality coal resources are wasted. With the continuous improvement of the recovery rate requirement of coal resources, the application of the end slope coal mining machine will become more widespread and important, and it is an important technical guarantee for realizing fine, efficient and safe mining of coal resources. As the core power mechanism of the end slope coal mining machine, the structure model and research results of the driving platform have important engineering application value for guiding efficient end slope coal mining technology.

[0002] The inventor found in the research that the prior art end slope coal mining machine at least has the following disadvantages: The coal on the side slope cannot be mined by large equipment due to its special location and relatively small amount. The end slope coal mining machine, as a key mining equipment, can improve the coal recovery rate by 5%-10%. The main shortcomings of the existing end slope coal mining machine are low automation, large space occupation, complex structure, complex maintenance, limited mining depth, high maintenance cost and the like. SUMMARY

[0003] The purposes of the present application include, for example, providing an end slope coal mining machine driving device having at least the advantages of high automation, convenient assembly and disassembly, small space size, high efficiency, fast dynamic response, smooth operation, reliable structure and large mining depth.

[0004] The embodiments of the present application can be implemented as follows: In a first aspect, the present application provides an end slope coal mining machine driving device, comprising: a rack, a sliding platform, a cutting drum, a first extender and a plurality of jointed propulsion arms; the rack is used for positioning on the ground, the sliding platform is connected with the rack through the first extender, the cutting drum is connected with the sliding platform through the propulsion arms, the first extender is used for driving the cutting drum to advance or retreat through the sliding platform and the propulsion arms, and any two of the plurality of jointed propulsion arms are detachably connected.

[0005] In an optional embodiment, adjacent propulsion arms are inserted and matched through a stop opening structure, and a propulsion arm located at the rear end of adjacent propulsion arms transmits a thrust to a propulsion arm located at the front end through the stop opening structure.

[0006] In an optional embodiment, positioning holes are arranged on the advancing arms, the positioning holes of adjacent advancing arms are communicated when the adjacent advancing arms are spliced, positioning shafts are arranged in the communicated positioning holes, and the adjacent advancing arms are detachably connected through the positioning shafts.

[0007] In an optional embodiment, the end-slope coal mining machine driving device further comprises a sliding plate and a second extender; one end of the second extender is connected with the sliding platform, and the other end is connected with the sliding plate, for driving the sliding plate to slide relative to the sliding platform; the advancing arm farthest from the cutting drum in the plurality of advancing arms is detachably connected with the sliding plate.

[0008] In an optional embodiment, the end-slope coal mining machine driving device further comprises a material conveying mechanism, the material conveying mechanism comprising a driver and a plurality of spliced helical conveying shafts, the driver being connected with the sliding platform; The advancing arms are provided with material conveying channels, and the plurality of helical conveying shafts are arranged in the material conveying channels of the plurality of advancing arms respectively, and the helical conveying shafts on the side are detachably connected with the driver.

[0009] In an optional embodiment, the helical conveying shaft comprises a flexible shaft, a helical blade, a first connecting end and a second connecting end, the helical blade being fixedly connected with the flexible shaft, the first connecting end and the second connecting end being fixed at two ends of the flexible shaft respectively, and the first connecting end and the second connecting end being provided as concave-convex structures for mutual plug-in cooperation; adjacent helical conveying shafts are plug-in cooperated through corresponding first connecting ends and second connecting ends, and are relatively fixed in the circumferential direction of the flexible shaft.

[0010] In an optional embodiment, the rotating shaft of the driver is plug-in cooperated with the corresponding helical conveying shaft, and the rotating shaft and the helical conveying shaft are relatively fixed in the circumferential direction of the rotating shaft.

[0011] In an optional embodiment, the material conveying mechanism further comprises a cover body, the cover body being connected with the driver, the rotating shaft being arranged in the cover body, and the cover body being detachably butted with the advancing arm farthest from the cutting drum in the plurality of advancing arms.

[0012] In an optional embodiment, the number of the material conveying mechanisms is two and the two material conveying mechanisms are arranged side by side, and the helical conveying shafts of the two material conveying mechanisms are arranged in the corresponding material conveying channels.

[0013] In an optional embodiment, the end-slope coal mining machine driving device further comprises a sliding rail, the sliding rail being fixed on the machine frame, and the sliding platform being slidably connected with the sliding rail.

[0014] Beneficial effects of the embodiments of the present application include, for example: To sum up, the end coal mining machine driving device provided by the embodiment can gradually increase the pushing depth by gradually increasing the number of pushing arms, so that large-depth mining can be performed in a narrow space. During operation, the first extender is first elongated, a reserved space is formed between the sliding platform and the cutting drum, a pushing arm is placed in the installation space, one end of the pushing arm is connected with the cutting drum, and the other end is connected with the sliding platform. After the installation of the first-stage pushing arm is completed, the first extender is started to be shortened. Since the rack is fixed, the sliding platform can transmit the pushing force to the cutting drum through the pushing arm, and then the cutting drum is pushed forward to perform the end coal mining operation. After one stroke of pushing is completed, the rear end of the pushing arm is detached from the sliding platform, and then the first extender is elongated. Since the rack is fixed, the sliding platform retreats, that is, the sliding platform moves away from the cutting drum, a space is formed between the sliding platform and the first-stage pushing arm, and a second-stage pushing arm is installed in the reserved space. The two ends of the second-stage pushing arm are connected with the first-stage pushing arm and the sliding platform, respectively. After the installation of the second-stage pushing arm is completed, the first extender is started to be shortened. Since the rack is fixed, the sliding platform can transmit the pushing force to the first-stage pushing arm and the cutting drum through the second-stage pushing arm, so that the cutting drum is pushed forward to perform the end coal mining operation. The operation is repeated to accumulate multiple pushing arms, so that large-depth mining can be realized, and the use range is wide. Meanwhile, when the machine is retreated after the excavation is completed, the operation of assembling the multiple pushing arms is similar, but the sequence is just the opposite. The pushing arms are removed from the end farthest from the cutting drum, and are removed step by step until the retreat is completed. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0016] Figure 1 FIG. 1 is a schematic diagram of an end coal mining machine driving device of the present application; Figure 2 FIG. 2 is a partial structure schematic diagram of the end coal mining machine driving device of the present application; Figure 3 FIG. 3 is a schematic diagram of a pushing arm of the present application; Figure 4 FIG. 4 is a schematic diagram of a spiral conveying shaft of the present application.

[0017] FIG. 1 is a schematic diagram of an end coal mining machine driving device of the present application; 100-Frame; 200-Sliding platform; 300-Cutting roller; 400-First telescopic device; 500-Propeller arm; 501-Material conveying channel; 510-Connecting plate; 600-Sliding plate; 700-Second telescopic device; 800-Material conveying mechanism; 810-Driver; 820-Screw conveyor shaft; 821-Flexible shaft; 822-Screw blade; 823-First connecting end; 824-Second connecting end; 830-Cover; 840-Guard; 900-Slide rail. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0022] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0023] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0024] Please refer to Figures 1-4This embodiment provides a drive device for an end-face coal mining machine, which includes a frame 100, a sliding platform 200, a cutting drum 300, a first telescopic joint 400, and a spliced ​​multi-section push arm 500. The frame 100 is used to position itself on the ground, and the sliding platform 200 is connected to the frame 100 through the first telescopic joint 400. The cutting drum 300 is connected to the sliding platform 200 through the push arm 500, and the first telescopic joint 400 is used to drive the cutting drum 300 forward or backward through the sliding platform 200 and the push arm 500. Any two sections of the multi-section push arm 500 are detachably connected.

[0025] As described above, the working principle of the end-face coal mining machine drive device provided in this embodiment is as follows: By coordinating multiple sections of the thrust arm 500, the thrust depth can be gradually increased as the number of thrust arms 500 is increased, enabling deep end-face coal mining in confined spaces. During operation, the first telescopic device 400 is extended, creating a reserved space between the sliding platform 200 and the cutting drum 300. The first-stage thrust arm 500 is placed within this space, with one end connected to the cutting drum 300 and the other end connected to the sliding platform 200. After the first-stage thrust arm 500 is installed, the first telescopic device 400 is activated to shorten it. Since the frame 100 is fixed, the sliding platform 200 can transmit thrust to the cutting drum 300 via the thrust arm 500, causing the cutting drum 300 to advance forward for end-face coal mining operations. After completing one stroke of the advance, the rear end of the advance arm 500 is disconnected from the sliding platform 200. Then, the first telescopic device 400 is extended. Since the frame 100 remains stationary, the sliding platform 200 is moved backward, that is, the sliding platform 200 moves away from the cutting drum 300, creating a gap between the sliding platform 200 and the first-stage advance arm 500 to form a reserved space. The second-stage advance arm 500 is then installed in the reserved space, and both ends of the second-stage advance arm 500 are connected to the first-stage advance arm 500. The secondary thrust arm 500 and the sliding platform 200 are connected. After the installation of the secondary thrust arm 500 is completed, the first telescopic device 400 is activated to shorten it. Since the frame 100 is fixed, the sliding platform 200 can transmit thrust to the primary thrust arm 500 and the cutting drum 300 through the secondary thrust arm 500, causing the cutting drum 300 to move forward for end-face coal mining. This operation can be repeated to add multiple sections of the thrust arm 500, enabling deep mining and wide applicability. Simultaneously, when the excavation is completed and the machine is retracted, the operation is similar to assembling multiple sections of the thrust arm 500, but the sequence is reversed. The thrust arm 500 is dismantled starting from the end furthest from the cutting drum 300, section by section, until the retraction is complete.

[0026] It should be understood that the descriptions of primary, secondary, etc., are merely for the convenience of describing the assembly sequence when assembling the multi-section propulsion arm 500, and do not impose any restrictions on the structure of the propulsion arm 500.

[0027] By using multiple 500-section propulsion arms in combination, the cutting drum 300 can advance to a depth of 300m in confined spaces during coal mining operations at the coal face, providing a wide operating range. Furthermore, a single telescoping device is sufficient for deep propulsion, resulting in low energy consumption, low cost, low failure rate, and stable and reliable operation.

[0028] The following embodiments illustrate the details of the end-face coal mining machine drive device of this application by way of example.

[0029] Please refer to Figures 1-4 In this embodiment, optionally, a drive device for an end-face coal mining machine includes a frame 100, a sliding platform 200, a cutting drum 300, a first telescopic joint 400, a multi-section push arm 500 (split-type), a sliding plate 600, a second telescopic joint 700, a spliced ​​material conveying mechanism 800, and a slide rail 900. The frame 100 is positioned on the ground. The slide rail 900 is mounted on the frame 100. The sliding platform 200 is connected to the frame 100 via the first telescopic joint 400, and the sliding platform 200 cooperates with the slide rail 900 for smooth and reliable sliding. One end of the second telescopic joint 700 is mounted on the sliding platform 200, and the sliding plate 600 is slidably connected to the sliding platform 200. The other end of the second telescopic joint 700 is connected to the sliding plate 600, and the second telescopic joint 700 can drive the sliding plate 600 to slide. The multi-section push arm 500 can be installed between the cutting drum 300 and the sliding plate 600. The first telescopic device 400 is used to drive the cutting drum 300 forward or backward through the sliding platform 200, the sliding plate 600, the second telescopic device 700, and the push arm 500. Any two sections of the multi-section push arm 500 can be detachably connected, allowing the multi-section push arm 500 to be assembled step by step from front to back to increase the pushing depth, and also allowing the multi-section push arm 500 to be disassembled step by step from back to front to retract the entire machine.

[0030] In this embodiment, optionally, there can be two first telescopic joints 400. The two first telescopic joints 400 are arranged in parallel and spaced apart. The telescopic ends of the two first telescopic joints 400 are connected to the sliding platform 200. The two first telescopic joints 400 work together to drive the sliding platform 200 forward or backward at the same time, thereby improving the stability of the sliding platform 200.

[0031] In this embodiment, optionally, there can be two second telescopic joints 700, which are arranged in parallel and spaced apart, and both are connected to the sliding platform 200. Correspondingly, there are two sliding plates 600. The telescopic ends of the two second telescopic joints 700 are respectively connected to the two sliding plates 600.

[0032] It should be understood that both the first expansion joint 400 and the second expansion joint 700 can be configured as hydraulic cylinders or pneumatic cylinders, etc., and their operation is stable and reliable.

[0033] In this embodiment, optionally, each push arm 500 is configured as a box structure, that is, each push arm 500 is provided with a material conveying channel 501, both ends of which are open in the axial direction. Furthermore, each push arm 500 has a groove and a protrusion at both ends that cooperate with each other. For example, the front end of the push arm 500 is a protrusion, and the rear end is a groove. In this way, when two adjacent push arm sections 500 are joined, the front end of the rear push arm 500 can engage with the rear end of the front push arm 500, thus forming a stop structure, improving the stability of the connection, and the stop structure is also more conducive to the transmission of thrust.

[0034] Furthermore, connecting plates 510 are provided on both sides of the propulsion arm 500. These connecting plates 510 can be stacked and fitted with two sliding plates 600 during assembly. The sliding plates 600 and their corresponding connecting plates 510 can be detachably connected via pin structures or similar components. Simultaneously, the two interlocking propulsion arms 500 can also be detachably connected via structural components. These components not only position adjacent propulsion arms 500 but also transmit thrust. For example, the propulsion arm 500 has positioning holes. When adjacent propulsion arms 500 are joined, the corresponding positioning holes are connected, and structural components such as positioning shafts pass through these connected positioning holes. Adjacent propulsion arms 500 are detachably connected via positioning shafts. During assembly, the design of the sliding plates 600 supports the propulsion arms 500, thus initially positioning them and facilitating their installation.

[0035] It should be noted that when multiple push arms 500 are connected, the material conveying channels 501 of adjacent push arms 500 are connected, forming a channel for conveying materials, allowing materials to be output from one end of the cutting drum 300 to the rear end. With each additional push arm 500 section, the length of the channel increases accordingly. The push arm 500 not only transmits thrust but also provides a channel for material conveying, integrating multiple functions into a compact structure with a small size and minimal space occupation, making it suitable for mining in confined spaces.

[0036] In this embodiment, optionally, the material conveying mechanism 800 includes a driver 810 and a spliced ​​multi-section spiral conveyor shaft 820. The driver 810 is connected to the sliding platform 200. The driver 810 can be set as a permanent magnet synchronous motor. The permanent magnet synchronous motor directly drives the spiral conveyor shaft 820 to complete the material transportation. Compared with the traditional geared motor, the overall structure is smaller, more efficient, has a faster dynamic response, and runs more smoothly.

[0037] Optionally, the number of drivers 810 can be two, arranged side by side. Each driver 810 drives one set of screw conveyor shafts 820. Both sets of screw conveyor shafts 820 are located within the material conveying channel 501. It should be understood that when installing the push arm 500, the two screw conveyor shafts 820 are also installed simultaneously. For example, the two parallel screw conveyor shafts 820 can be inserted into the push arm 500 first. When assembling the push arm 500, the two screw conveyor shafts 820 are respectively installed and fitted with the two front screw conveyor shafts 820.

[0038] Optionally, the screw conveyor shaft 820 can be configured as a flexible shaft structure capable of transmitting torque, which facilitates assembly and enables torque transmission. For example, the screw conveyor shaft 820 includes a flexible shaft 821, a screw blade 822, a first connecting end 823, and a second connecting end 824. The screw blade 822 is fixedly connected to the flexible shaft 821. The first connecting end 823 and the second connecting end 824 are respectively fixed at both ends of the flexible shaft 821. The first connecting end 823 and the second connecting end 824 are configured as interlocking concave-convex structures. Adjacent screw conveyor shafts 820 are interlocked through corresponding first connecting ends 823 and second connecting ends 824, and the two are relatively fixed in the circumferential direction of the flexible shaft 821. During interlocking, the flexible shaft 821 can undergo a certain bending deformation. When the first connecting end 823 and the second connecting end 824 are aligned, the flexible shaft 821 extends under the elastic force of the bending deformation, causing the first connecting end 823 and the second connecting end 824 to interlock together, completing the assembly. It should be understood that when installing the screw conveyor shaft 820, one end of it is first inserted into the front screw conveyor shaft 820, and the rear end is inserted and fitted by bending and deformation.

[0039] It should be understood that the first connecting end 823 and the second connecting end 824 can be square heads, etc., as long as they can transmit torque after being plugged in.

[0040] Optionally, the conveying mechanism 800 also includes a cover 830 and a protective cover 840. The cover 830 is connected to the driver 810, and the rotating shaft passes through the cover 830. The cover 830 is detachably connected to the push arm 500 of the multi-section push arm 500 that is away from the cutting drum 300. By setting the cover 830, the airtightness of the conveying channel 501 can be improved, which is conducive to material conveying, and the material is less likely to scatter everywhere, and jamming is less likely to occur. The protective cover 840 is installed on the front side of the driver 810 and can block coal blocks.

[0041] The end-face coal mining machine drive device provided in this embodiment is mainly applicable to the application scenario of residual coal pillars on the upper side of coal mines. It has the advantages of high automation, convenient assembly and disassembly, small size, high efficiency, fast dynamic response, stable operation, reliable structure, and large mining depth. Two permanent magnet synchronous motors are arranged on the sliding platform 200. The two motors are driven independently, and the permanent magnet synchronous motors directly drive the screw conveyor shaft 820 to complete the material transportation. Compared with traditional geared motors, the overall structure is smaller, more efficient, has a faster dynamic response, and runs more smoothly. The design and arrangement of the sliding plate 600 makes the installation and disassembly of the propulsion arm 500 convenient and reliable, reduces the intensity of manual labor, and reduces the installation space of the propulsion arm 500. During the cutting operation, the frame 100 remains stationary, and the propulsion arm 500 is added section by section to advance the excavation, with a cutting depth of up to 300m. The sliding platform 200 is pushed and pulled by the large-stroke hydraulic cylinders on both sides to drive the cutting system to perform end-face coal mining operations. Stroke sensors can be arranged on the hydraulic cylinders to make the front-end cutting operation precise, safe, and controllable.

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A drive device for an end-face coal mining machine, characterized in that, include: The machine comprises a frame (100), a sliding platform (200), a cutting drum (300), a first telescopic joint (400), and a spliced ​​multi-section push arm (500); the frame (100) is used to position itself on the ground, and the sliding platform (200) is connected to the frame (100) via the first telescopic joint (400); the cutting drum (300) is connected to the sliding platform (200) via the push arm (500), and the first telescopic joint (400) is used to drive the cutting drum (300) forward or backward via the sliding platform (200) and the push arm (500); any two sections of the multi-section push arm (500) are detachably connected.

2. The end-face coal mining machine drive device according to claim 1, characterized in that: The adjacent propulsion arms (500) are connected by a stop structure, and the propulsion arm (500) at the rear end of the adjacent propulsion arms (500) transmits thrust to the propulsion arm (500) at the front end through the stop structure.

3. The end-face coal mining machine drive device according to claim 1, characterized in that: The push arm (500) is provided with a positioning hole. When adjacent push arms (500) are spliced ​​together, the corresponding positioning holes are connected. A positioning shaft is inserted into the connected positioning hole. Adjacent push arms (500) are detachably connected through the positioning shaft.

4. The end-face coal mining machine drive device according to claim 1, characterized in that: The end-side coal mining machine drive device also includes a sliding plate (600) and a second telescopic device (700); one end of the second telescopic device (700) is connected to the sliding platform (200), and the other end is connected to the sliding plate (600), for driving the sliding plate (600) to slide relative to the sliding platform (200); the push arm (500) furthest from the cutting drum (300) among the multiple push arms (500) is detachably connected to the sliding plate (600).

5. The end-face coal mining machine drive device according to claim 4, characterized in that: The end-side coal mining machine drive device also includes a material conveying mechanism (800), which includes a driver (810) and a spliced ​​multi-section spiral conveyor shaft (820). The driver (810) is connected to the sliding platform (200). The push arm (500) is provided with a material conveying channel (501), and multiple sections of the spiral conveying shaft (820) are respectively inserted into the material conveying channel (501) of the multiple sections of the push arm (500). The spiral conveying shaft (820) located on the side is detachably connected to the driver (810).

6. The end-face coal mining machine drive device according to claim 5, characterized in that: The spiral conveying shaft (820) includes a flexible shaft (821), a spiral blade (822), a first connecting end (823), and a second connecting end (824). The spiral blade (822) is fixedly connected to the flexible shaft (821). The first connecting end (823) and the second connecting end (824) are respectively fixed at both ends of the flexible shaft (821). The first connecting end (823) and the second connecting end (824) are configured as a concave-convex structure that interlocks with each other. Adjacent spiral conveying shafts (820) are interlocked through corresponding first connecting ends (823) and second connecting ends (824), and the two are relatively fixed in the circumferential direction of the flexible shaft (821).

7. The end-face coal mining machine drive device according to claim 5, characterized in that: The rotating shaft of the driver (810) is plugged into the corresponding spiral conveying shaft (820), and the rotating shaft and the spiral conveying shaft (820) are fixed relative to each other in the circumferential direction of the rotating shaft.

8. The end-face coal mining machine drive device according to claim 7, characterized in that: The material conveying mechanism (800) also includes a cover (830) connected to the driver (810), the rotating shaft passing through the cover (830), and the cover (830) being separably docked with the push arm (500) of the multiple push arms (500) that is away from the cutting drum (300).

9. The end-face coal mining machine drive device according to claim 7, characterized in that: The number of the conveying mechanisms (800) is two and they are arranged side by side. The spiral conveying shafts (820) of the two conveying mechanisms (800) are both inserted into the corresponding conveying channels (501).

10. The end-face coal mining machine drive device according to claim 1, characterized in that: The end-side coal mining machine drive device also includes a slide rail (900), which is fixed on the frame (100), and the sliding platform (200) is slidably connected to the slide rail (900).

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