A device for avoiding anchor rods and anchor cables for a hydraulic support in a roadway

Abstract

The utility model relates to roadway support safety equipment technical field, especially relate to a device that avoids the anchor rod, anchor cable for roadway hydraulic support, it includes support beam, jack, guide strip and slide rail, support beam includes two or more support box and connecting plate, support box all fixedly established on the connecting plate, and adjacent two support box form the avoidance groove matched with anchor rod, anchor cable in roadway, support beam is placed on the roof beam of hydraulic support, slide rail is fixedly established on the roof beam two two symmetry, support beam is used for jointing in the slide rail and can move back and forth, the fixed end of jack is connected on the roof beam, and the projecting end connects support beam, adjusts the position of support beam on the roof beam through adjusting jack projecting end, to make the position of avoidance groove correspond anchor rod, anchor cable. Its beneficial effect is, the device simple structure, convenient installation, convenient operation has stronger adaptability, can effectively avoid the damage of support to anchor rod, anchor cable support system in the supporting process.

Description

Technical Field

[0001] This utility model relates to the technical field of roadway support safety equipment, and in particular to a device for avoiding anchor bolts and anchor cables for roadway hydraulic supports. Background Technology

[0002] Modern fully mechanized mining faces typically employ a combination of bolt and cable support for roadway support. This utilizes the suspension, combined beam, and compression reinforcement effects of bolts and cables to maintain the stability of the roadway roof. However, for coal mine safety requirements, reinforced support must be provided within the area of ​​advance pressure at the connection between the safety exit of the mining face and the roadway, and the length of the reinforced roadway must be no less than 20 meters. In mining, tunneling, and underground engineering projects, pre-support structures are applied to the unexcavated rock or soil layers before excavation to prevent deformation and collapse of the surrounding rock, ensuring construction safety. Advance support generally uses long, step-by-step self-propelled hydraulic supports to reinforce the roadway roof. However, this support method often lacks avoidance bolts and cables above the roof beams, failing to consider the compatibility between the roof beams and the roadway bolt and cable support system. Alternatively, the equipment may be too simplistic and lack a high degree of mechanization.

[0003] Because the pre-support system lacks obstacle avoidance devices above its roof beam during roadway pre-support, it cannot avoid the existing anchor bolts and cables in the roadway. The roof beam directly compresses these anchor bolts and cables, causing cable heads to bend, support trays to deform and fail, and in severe cases, leading to the destruction of the anchor bolt and cable support system and resulting in coal and rock fracturing. How to effectively avoid such problems is a pressing technical issue that needs to be addressed. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a device for avoiding anchor bolts and anchor cables for hydraulic supports in roadways. The device is installed on the top beam of the roadway advance support to avoid anchor bolts and anchor cables on the roadway roof. The device has a simple structure, is easy to install and operate, has strong adaptability, and can effectively avoid damage to the anchor bolt and anchor cable support system during the support process.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0008] A device for avoiding anchor bolts and cables in a roadway hydraulic support includes a support beam for supporting the roadway roof and avoiding anchor bolts and cables on the roadway roof, a jack for adjusting the position of the support beam, and slide rails. The support beam includes two or more support boxes and connecting plates for fixing the support boxes. An avoidance groove matching the anchor bolts and cables on the roadway roof is formed between adjacent support boxes. The support beam is placed on the top beam of the hydraulic support. Slide rails are symmetrically fixed to the top beam of the hydraulic support in pairs, and the support boxes of the support beam are engaged in the slide rails. The fixed end of the jack is connected to the side of the top beam, and the extended end of the jack is connected to the support beam. By adjusting the extension and retraction of the extended end of the jack, the position of the support beam on the top beam is adjusted so that the anchor bolts and cables are located within the avoidance groove.

[0009] Optionally, the support box includes horizontal stiffeners, vertical stiffeners, and a cover plate, forming the box shape through two horizontal stiffeners, two vertical stiffeners, and the cover plate.

[0010] Optionally, the support beam further includes a first connecting lug plate, which is used to connect the extended end of the jack and is fixedly mounted on the connecting plate.

[0011] Optionally, two clamping plates are fixedly provided on the first connecting ear plate. Both clamping plates are provided with through holes, and the top end of the protruding end is provided with a corresponding through hole. The protruding end is placed between the two clamping plates, the through holes are aligned, and the protruding end is hinged to the first connecting ear plate by inserting a pin into the through hole.

[0012] Optionally, the support beam further includes a guide bar, which is used to engage with the slide rail and is fixedly disposed on the side of the support box.

[0013] Optionally, the slide rail includes a longitudinal baffle and a transverse baffle. The longitudinal baffle is arranged parallel to the top beam and fixed on the top beam, and the transverse baffle is fixed on the upper end of the longitudinal baffle for engaging the guide strip on the support box.

[0014] Optionally, a second connecting lug is fixedly connected to the side of the top beam, and the fixed end of the jack is connected to the second connecting lug.

[0015] Optionally, two second connecting ear plates are provided. The second connecting ear plates are fixedly mounted on the top beam by welding. Both second connecting ear plates are provided with through holes. The fixed end of the jack is provided with a corresponding through hole. The fixed end of the jack is placed between the two second connecting ear plates, aligned with the through holes, and the fixed end of the jack is hinged to the second connecting ear plates by inserting a pin into the through hole.

[0016] Optionally, a support beam has three support boxes, and guide strips are fixedly provided on the sides of the two outer support boxes. The guide strips are used to engage with the slide rails. Correspondingly, there are two sets of slide rails, and the two sets of slide rails are used to engage with the two outer support boxes respectively.

[0017] (III) Beneficial Effects

[0018] The beneficial effects of this utility model are:

[0019] This utility model provides a device for avoiding anchor bolts and anchor cables in a roadway hydraulic support. By using two or more support boxes to form a support beam, and forming an avoidance groove between every two adjacent support boxes, the top beam of the hydraulic support can be effectively prevented from contacting the anchor bolts and anchor cables. The movement of the support beam is driven by the extension and retraction of the jack's protruding end, which can effectively adjust the avoidance position to avoid the anchor bolts and anchor cables. It is flexible in use, and a slide rail is provided on the top beam of the roadway hydraulic support, so that the support beam can slide smoothly in the slide rail and is safe to use.

[0020] This utility model provides a device for avoiding anchor bolts and cables in roadway hydraulic supports. It is an independent mechanism with strong versatility, allowing for standardized production. The device has a simple structure and can be used on both newly designed supports and those undergoing major renovations, demonstrating strong applicability. Attached Figure Description

[0021] Figure 1 This is a top view schematic diagram of the support beam in a preferred hydraulic support device for roadways using an avoidance anchor bolt and anchor cable according to the present invention.

[0022] Figure 2 This is a side view of the support beam in a preferred hydraulic support device for roadways using an avoidance anchor bolt and anchor cable according to the present invention.

[0023] Figure 3 This is a front view schematic diagram of the support beam in a preferred hydraulic support device for roadways using an avoidance anchor bolt and anchor cable according to the present invention;

[0024] Figure 4 This is a schematic diagram of the slide rail and the second connecting ear plate in a preferred hydraulic support device for roadways according to this utility model.

[0025] Figure 5 This is a schematic diagram of the installation of the slide rail in a preferred hydraulic support device for roadways according to the present invention.

[0026] Figure 6 This is a top view schematic diagram of the preferred obstacle avoidance anchor bolt and anchor cable device for hydraulic support in roadways according to this utility model;

[0027] Figure 7 A schematic diagram of installing avoidance anchor bolts and anchor cables on the top beam of a hydraulic support;

[0028] Figure 8 A schematic diagram of the support state when the preferred hydraulic support for roadways of this utility model is installed with the avoidance anchor bolt and anchor cable device;

[0029] Figure 9 This is a diagram showing the support status when there are no avoidance anchor bolts or anchor cables on the top beam of the hydraulic support.

[0030] [Explanation of Labels in the Attached Image]

[0031] 1-1: Support beam;

[0032] 1: Support box;

[0033] 2: Guide strip;

[0034] 3: First connecting ear plate;

[0035] 31: Through hole;

[0036] 4: Connecting plate;

[0037] 5: Slide rail;

[0038] 6: Second connecting ear plate;

[0039] 7: Top beam;

[0040] 8: Longitudinal baffle;

[0041] 9: Horizontal baffle;

[0042] 10: Qianjin Peak

[0043] 11: Anchor bolt. Detailed Implementation

[0044] To better explain and facilitate understanding of this utility model, a detailed description of its specific embodiments is provided below with reference to the accompanying drawings. In this document, directional terms such as "upper," "lower," etc., are used interchangeably with other directional terms. Figure 7 The orientation is used as a reference.

[0045] This utility model embodiment proposes a device for avoiding anchor bolts and anchor cables in roadway hydraulic supports, in order to solve the problems in the prior art, such as Figure 9The example shown is an advanced support system without any avoidance devices for anchor bolts or cables. The device, installed on the top beam of the advanced support system for the roadway, is designed to avoid anchor bolts and cables on the roadway roof. It includes two or more support beams, jacks, and slide rails. The support beams support the roadway roof and also form a device to avoid anchor bolts and cables on the roadway roof. Each support beam includes two or more support boxes and connecting plates. The support boxes are fixed to the connecting plates, and adjacent support boxes form avoidance grooves that match the anchor bolts and cables in the roadway. The support beams are placed under hydraulic support. On the top beam of the support frame; the straight line formed by multiple support boxes of the support beam is arranged parallel to the long axis of the roadway, and the slide rails are symmetrically fixed on the top beam of the hydraulic support in pairs. The slide rails are used to clamp the support boxes of the support beam; the fixed end of the jack is connected to the top beam by a pin, and the extended end of the jack is hinged to the support beam by a pin; by adjusting the extension and retraction of the extended end of the jack, the support beam can be moved in the slide rail, thereby adjusting the position of the support beam on the top beam so that the clearance groove corresponds to the position of the anchor rod and anchor cable.

[0046] The device of this invention firstly comprises a support beam consisting of two or more support boxes and connecting plates for fixing the support boxes. A clearance groove is formed between every two adjacent support boxes to prevent the hydraulic support beam from contacting the anchor bolts and cables. The support boxes support the tunnel roof. Secondly, the support beam is connected to a telescopic jack, which can move the beam back and forth, and the position of the support beam can be adjusted hydraulically. A slide rail welded to the top beam allows the support beam to slide smoothly within the rail, ensuring that the support beam does not detach from the top beam and that the structure is completely stable. This device has a simple structure, is easy to install and operate, and has strong adaptability, effectively preventing damage to the anchor bolt and cable support system during the support process.

[0047] In one embodiment, the support box includes horizontal stiffeners, vertical stiffeners, and a cover plate, forming a box shape through two horizontal stiffeners, two vertical stiffeners, and the cover plate; the support beam further includes a first connecting lug and a guide strip, the first connecting lug being used to fix the extended end of the jack, and the first connecting lug being fixedly mounted on the connecting plate; the guide strip being used to engage with the slide rail, and the guide strip being fixedly mounted on the side of the support box.

[0048] Furthermore, the slide rail includes a longitudinal baffle and a transverse baffle. The longitudinal baffle is set parallel to the top beam and fixed on the top beam. The transverse baffle is fixed on the upper end of the longitudinal baffle and is used to engage the guide strip of the support box of the support beam. It can effectively stabilize the support box in the slide rail and prevent the support box from moving up, down, left, or right.

[0049] In one embodiment, a support beam may have three support boxes, and guide strips are fixedly provided on the sides of the two outer support boxes. The guide strips are used to engage with slide rails. Correspondingly, there are two sets of slide rails, and the two sets of slide rails are used to engage with the two outer support boxes respectively.

[0050] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0051] Example 1

[0052] A device for avoiding anchor bolts and cables in a roadway hydraulic support includes one or more support beams for supporting the roadway roof and avoiding anchor bolts and cables on the roadway roof, jacks for adjusting the position of the support beams, and slide rails. Each support beam includes two or more support boxes and a connecting plate. The support boxes are all fixedly mounted on the connecting plate, and adjacent support boxes form an avoidance groove that matches the anchor bolts and cables in the roadway. The support beam is placed above the top beam of the hydraulic support. The straight line of the multiple support boxes of the support beam is parallel to the long axis of the roadway. The slide rail is fixedly mounted on the top beam of the hydraulic support, and the support beam is engaged in the slide rail. The fixed end of the jack is connected to the side of the top beam, and the support beam is connected to the extended end of the jack through a pin. The position of the support beam on the top beam is adjusted by the extension and retraction of the extended end of the jack, so that the avoidance groove corresponds to the position of the anchor bolt and cable, and the anchor bolt and cable are located within the avoidance groove. The top beam of the hydraulic support for the roadway is the core component of the support system. It is mainly used to support the roof of the roadway or coal mining face, prevent the roadway or roof from collapsing, and ensure operational safety.

[0053] Specifically, the support beam includes two or more support boxes, guide strips, a first connecting lug plate, and a connecting plate. The support boxes are formed into a box shape by horizontal stiffeners, longitudinal stiffeners, and a cover plate, and are fixed to the connecting plate. Several support boxes are connected into a whole by the connecting plate. The space between adjacent support boxes forms a clearance groove that matches the anchor bolts and cables in the roadway. The horizontal and longitudinal stiffeners effectively prevent the support beam from being damaged under high roadway pressure. The guide strip is used to engage with the slide rail. The guide strip is symmetrically welded to both sides of the support box and, after installation, cooperates with the slide rail to limit the left-right and up-down movement of the support box on the top beam. A first connecting lug plate is welded to the connecting plate, and is connected to the extended end of the telescopic jack (piston rod end) via a pin. The fixed end of the jack (cylinder bottom end) is fixed to a second connecting lug plate welded to the top beam via a pin. In use, the extension and retraction of the jack's protruding end drives the support beam to move back and forth along the top beam in the slide rail, thereby adjusting the position of the support beam to avoid the anchor rods and anchor cables in the roadway, so as to prevent the top beam from directly squeezing the anchor rods and anchor cables and ensuring the safety of the roadway.

[0054] During installation, several sets of slide rails are welded onto the top beam. Each slide rail includes longitudinal and transverse baffles. The longitudinal baffles are fixed to the top beam parallel to it, while the transverse baffles are fixed above the longitudinal baffles. These baffles act as guides for engaging the support box of the support beam, preventing the support box from detaching from the slide rails. Each set of slide rails is symmetrically arranged in pairs on the top beam, effectively securing the support box within them. The longitudinal baffles on the slide rails limit the lateral position of the support beam on the top beam, while the transverse baffles limit its vertical position, preventing it from shifting up and down. A second connecting lug for connecting jacks is also welded to the side of the top beam.

[0055] Place the connecting plate of the support beam on the top beam, so that the guide strip on the support box is engaged in the slide rail. Further, connect the fixed end of the jack to the second connecting lug welded to the top beam via a pin; connect the extended end of the jack to the first connecting lug welded to the support beam via a pin. This allows the support beams to be installed above the top beam, with one jack installed on each support beam. The extension and retraction of the jack's extended end allows the support beam to slide back and forth on the top beam. Adjusting the extension and retraction length of the jack's extended end adjusts the position of the support beam, ensuring that the anchor bolts and anchor cables are positioned within the clearance groove formed by the support box.

[0056] Example 2

[0057] This embodiment of the roadway hydraulic support avoidance anchor bolt and cable device is based on embodiment 1, such as... Figures 1-3As shown, a support beam 1-1 has three support boxes 1, four guide strips 2, a first connecting lug 3, and a connecting plate 4. Each support box consists of horizontal and vertical stiffening plates and a cover plate, and the three support boxes are connected into a whole by the connecting plate 4. The guide strips 2 are welded to the side of the support box 1, and after installation, they cooperate with the slide rails 5 to limit the left and right and up and down directions of the support box 1 on the top beam. Two support boxes 1 with guide strips 2 are respectively located on both sides of the connecting plate 4. The support box without guide strips is fixedly located in the middle of the connecting plate 4. The first connecting ear plate 3 is welded to the connecting plate. The first connecting ear plate 3 can be located on the middle side edge of the connecting plate. During installation, there are two first connecting ear plates 3. Both first connecting ear plates 3 have through holes 31. The top end of the jack's protruding end has a corresponding through hole. The protruding end is placed between the two first connecting ear plates 3. The through holes 31 of the first connecting ear plates 3 are aligned with the through holes of the jack's protruding end. The pin is inserted into the through hole to hinge the protruding end to the first connecting ear plate 3. That is, the protruding end of the jack is connected to the first connecting ear plate 3 by the pin.

[0058] There are two sets of slide rails installed on the top beam for each support beam, and each set of slide rails has two rails, such as... Figures 4-5 As shown, a set of slide rails 5 are arranged opposite each other on the top beam 7. Specifically, the longitudinal baffles 8 of the slide rails 5 are fixedly welded to the left and right sides of the top beam, and the transverse baffles 9 fixed to the longitudinal baffles 8 are arranged opposite each other to facilitate the engagement of the guide strips 2 on the support box. Figure 6 and Figure 7 As shown, the position of the slide rail 5 is determined relative to the support box on both outer sides of the support beam, which has guide strips 2. When installing the jack 10, a second connecting ear plate 6 is welded to the side of the top beam 7. The second connecting ear plate 6 is used to connect the fixed end of the jack 10. Specifically, there are two second connecting ear plates 6, each with a through hole. The fixed end of the jack also has a through hole. During installation, the fixed end of the jack is placed between the two second connecting ear plates 6, the through hole of the fixed end of the jack 10 is aligned with the through hole on the second connecting ear plate 6, and a pin is inserted to connect the fixed end of the jack 10 to the second connecting ear plate 6 welded on the top beam 7.

[0059] The assembled roadway hydraulic support uses a device to avoid anchor bolts and anchor cables, such as... Figure 8 As shown, according to the arrangement of the anchor bolts 11 and anchor cables in the roadway roof, two sets of the avoidance device are installed on the top beam of each hydraulic support. The support box 1 is installed in the slide rail 5 on the top beam. The support beam and the top beam are connected into a whole by telescopic jacks. Two or more support boxes are welded on the connecting plate of the support beam. An avoidance groove matching the anchor bolts and anchor cables in the roadway is formed between two adjacent support boxes. The position of the support beam is adjusted by the extended end of the telescopic jacks so that the position of the anchor bolts and anchor cables is located in the avoidance groove.

[0060] The anchor bolt and anchor cable avoidance device provided by this utility model is an independent mechanism with strong versatility and can be standardized for production. The device has a simple structure and can be used on both newly designed supports and those undergoing major renovations, making it highly adaptable.

[0061] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0062] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0063] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0064] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0065] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for avoiding anchor bolts and anchor cables in a roadway hydraulic support, characterized in that, The system includes a support beam for supporting the roadway roof and avoiding anchor rods and anchor cables on the roadway roof, a jack for adjusting the position of the support beam, and a slide rail. The support beam (1-1) includes two or more support boxes (1) and a connecting plate (4) for fixing the support boxes (1). An avoidance groove matching the anchor rods and anchor cables on the roadway roof is formed between two adjacent support boxes (1). The support beam (1-1) is placed on the top beam (7) of the hydraulic support. The slide rails (5) are symmetrically fixed on the top beam of the hydraulic support. The support box (1) of the support beam (1-1) is snapped into the slide rail (5). The fixed end of the jack (10) is connected to the side of the top beam (7), and the extended end is connected to the support beam (1-1). The position of the support beam (1-1) on the top beam (7) is adjusted by adjusting the extension and retraction of the extended end of the jack (10) so that the anchor rods and anchor cables are located in the avoidance groove.

2. The device for avoiding anchor bolts and anchor cables for roadway hydraulic supports as described in claim 1, characterized in that, The supporting box (1) includes horizontal stiffeners, vertical stiffeners and a cover plate, and the box shape is formed by two horizontal stiffeners, two vertical stiffeners and a cover plate.

3. The device for avoiding anchor bolts and anchor cables for roadway hydraulic supports as described in claim 1, characterized in that, The support beam also includes a first connecting ear plate (3), which is used to connect the extended end of the jack. The first connecting ear plate (3) is fixedly mounted on the connecting plate (4).

4. The device for avoiding anchor bolts and anchor cables for roadway hydraulic supports as described in claim 3, characterized in that, The first connecting ear plate (3) is provided in two pieces. Both first connecting ear plates (3) are provided with through holes (31). The top of the protruding end is provided with a corresponding through hole. The protruding end is placed between the two first connecting ear plates (3), the through holes are aligned, and the protruding end is hinged to the first connecting ear plate (3) by inserting a pin into the through hole.

5. The device for avoiding anchor bolts and anchor cables for roadway hydraulic supports as described in claim 1, characterized in that, The support beam also includes a guide bar (2), which is used to engage with the slide rail (5). The guide bar (2) is fixedly located on the side of the support box (1).

6. The device for avoiding anchor bolts and anchor cables for roadway hydraulic supports as described in claim 5, characterized in that, The slide rail (5) includes a longitudinal baffle (8) and a transverse baffle (9). The longitudinal baffle (8) is set parallel to the top beam (7) and fixed on the top beam (7). The transverse baffle (9) is fixed on the upper end of the longitudinal baffle (8) and is used to snap onto the guide strip (2) on the support box (1).

7. The device for avoiding anchor bolts and anchor cables for roadway hydraulic supports as described in claim 1, characterized in that, A second connecting ear plate (6) is fixedly connected to the side of the top beam (7), and the fixed end of the jack is connected to the second connecting ear plate (6).

8. The device for avoiding anchor bolts and anchor cables for roadway hydraulic supports as described in claim 7, characterized in that, The second connecting ear plate (6) is provided in two pieces, and each of the two second connecting ear plates (6) is provided with a through hole. The fixed end of the jack (10) is provided with a corresponding through hole. The fixed end of the jack (10) is placed between the two second connecting ear plates (6), and the through holes are aligned. The fixed end of the jack (10) is hinged to the second connecting ear plate (6) by inserting a pin into the through hole.

9. The device for avoiding anchor bolts and anchor cables for roadway hydraulic supports as described in claim 1, characterized in that, A support beam is provided with three support boxes (1). The sides of the two outer support boxes (1) are fixed with guide strips (2). The guide strips (2) are used to engage the slide rails (5). Correspondingly, there are two sets of slide rails (5). The two sets of slide rails (5) are used to engage the two outer support boxes (1) respectively.

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