A one-piece safety cage structure for a mine car

Abstract

The utility model provides a kind of for whole safety cage structure of underground man-car, belong to underground man-car technical field, this whole safety cage structure for underground man-car includes cage frame, fender, reinforcing rib and connecting piece;The cage frame is rectangular three-dimensional frame structure, and it is constituted by top frame and bottom frame and four vertical columns of connecting top frame and bottom frame;The fender is arranged in the outer side of cage frame;The reinforcing rib is arranged in the inner side of cage frame, and the both ends of reinforcing rib are respectively welded with two adjacent vertical columns;The connecting piece is arranged in the four corner positions of bottom frame, and the connecting piece passes through bottom frame and extends downward, solve when encountering underground roadway roof drop object impact or lateral extrusion, the problem that safety cage is prone to overall or local plastic deformation even structural failure, threaten the ride safety of underground operating personnel.

Description

Technical Field

[0001] This utility model belongs to the field of underground personnel transport vehicle technology, and specifically relates to an integral safety cage structure for underground personnel transport vehicles. Background Technology

[0002] In underground working environments such as coal mines, personnel transport vehicles are essential for transporting workers to and from the working face. Due to the narrow space and harsh working environment of underground roadways, roof collapses are possible, and the sides of the roadways may also experience localized deformation and compression due to ground pressure. Personnel transport vehicles face safety threats such as roof impacts and lateral compression during operation. To protect the safety of passengers, personnel transport vehicles are usually equipped with safety cage structures. There are two main types of safety cage structures in existing technology. The first type is a modular assembly structure, which is assembled from multiple independent frame sections connected by bolts or pins. Its advantage is that it is easy to transport and assemble on-site, but its disadvantage is that the rigidity of the connection parts is relatively poor, and the connections are prone to loosening under underground vibration and impact loads. The first type is a simple frame structure, which consists of several steel pipes or sections welded together to form a three-dimensional frame covered with metal mesh or thin plates. Its advantage is that it is simple to manufacture and has a low cost, but its disadvantage is that the frame lacks effective reinforcing and supporting components. When subjected to large external impacts or compression, the frame columns are prone to bending and deformation, and the metal mesh or thin plates are also prone to tearing or denting, failing to provide reliable safety protection. In practical applications, both of these existing safety cage structures have shown insufficient overall rigidity and weak local strength under complex underground working conditions, resulting in multiple personnel injury accidents caused by safety cage deformation. Therefore, it is necessary to develop an underground personnel transport vehicle safety cage structure with strong overall rigidity and reliable protection capabilities. Utility Model Content

[0003] In view of this, the present invention provides an integral safety cage structure for underground personnel transport vehicles, which solves the problem that when encountering impacts from falling objects from the roof of underground roadways or lateral compression, the safety cage is prone to overall or partial plastic deformation or even structural failure, threatening the safety of underground workers.

[0004] This utility model is implemented as follows:

[0005] This utility model provides an integrated safety cage structure for an underground personnel transport vehicle, including a cage frame, protective plates, reinforcing ribs, and connectors. The cage frame is a rectangular three-dimensional frame structure, consisting of a top frame, a bottom frame, and four vertical columns connecting the top and bottom frames. The protective plates are located on the outer side of the cage frame and are connected to the vertical columns by welding. The reinforcing ribs are located on the inner side of the cage frame, with each end of the reinforcing rib welded to two adjacent vertical columns. The reinforcing ribs have a triangular plate-like structure, with their hypotenuses forming a 45-degree angle with the vertical columns. The connectors are located at the four corners of the bottom frame, passing through the bottom frame and extending downwards for connection to the personnel transport vehicle body.

[0006] The technical advantages of the integrated safety cage structure for underground personnel transport vehicles provided by this utility model are as follows: The rectangular three-dimensional frame structure of the cage body, combined with the outer side of the protective plate, forms all-round protection for the internal space of the underground personnel transport vehicle. The triangular plate-shaped arrangement of the reinforcing ribs on the inner side of the cage body frame and the 45-degree angle formed with the vertical columns allow external impact forces to be transmitted and dispersed to adjacent columns through the inclined sides, significantly improving the overall impact resistance and deformation resistance of the safety cage structure. The design of the connecting parts extending downward through the bottom frame ensures a firm connection between the safety cage and the personnel transport vehicle body. The integrated structure avoids the weak connection points present in the split structure, effectively ensuring the safety of underground workers.

[0007] Based on the above technical solution, the integral safety cage structure for underground personnel transport vehicles of this utility model can be further improved as follows:

[0008] The vertical column has an I-shaped cross-section, and the thickness of the web of the I-shaped structure is less than the thickness of the flange.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The vertical column adopts an I-shaped cross-section structure, which takes advantage of the bending performance of the I-beam. The design of the web thickness being less than the flange thickness reduces the self-weight of the column while ensuring the overall strength. The two flanges of the I-shaped structure bear tensile stress and compressive stress respectively, while the web mainly bears shear stress. This stress distribution makes the column have stronger bending stiffness when subjected to lateral impact, while reducing the amount of material used, reducing the overall weight, and facilitating the installation and transportation of the safety cage.

[0010] Furthermore, the top frame is a rectangular frame formed by welding four transverse connecting beams. The two ends of the transverse connecting beams are welded to the top of the vertical columns, and the cross-section of the transverse connecting beams is a rectangular tubular structure.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The top frame is a rectangular frame structure welded together by four transverse connecting beams, which ensures the overall rigidity and stability of the top. The welded connections between the two ends of the transverse connecting beams and the top of the vertical columns form a strong rigid node. The rectangular tubular cross-section structure has a large moment of inertia and torsional stiffness. When the top of the safety cage is impacted by falling objects from the roof of the underground roadway, the transverse connecting beams effectively disperse the impact force to the four vertical columns, avoiding local collapse and deformation of the top frame. The closed section of the rectangular tubular structure also prevents dust and moisture from entering the tube and causing corrosion, thus extending the service life.

[0012] Furthermore, the protective plate has an arc-shaped plate structure, with the arc-shaped convex surface of the protective plate facing the outside of the cage frame, the upper edge of the protective plate being flush with the lower surface of the top frame, and the lower edge of the protective plate being flush with the upper surface of the bottom frame.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The protective plate adopts an arc-shaped plate structure with the convex surface facing outward, which makes the contact area smaller when an external object hits it and the impact force is deflected along the tangent direction of the arc surface, reducing the impact component perpendicular to the protective plate. The arc structure itself has higher impact resistance and rigidity. The upper and lower edges of the protective plate are flush with the top and bottom frames, respectively, ensuring that there are no protruding or recessed parts between the protective plate and the frame, avoiding scraping or jamming with the tunnel wall when running in the narrow underground space. The arc-shaped convex surface also facilitates the natural sliding of water and dirt, reducing the amount of cleaning and maintenance work.

[0014] Furthermore, the thickness of the reinforcing rib is greater than the thickness of the protective plate, and the length of the hypotenuse of the reinforcing rib is equal to the distance between two adjacent vertical columns.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the design of the reinforcing rib plate being thicker than the protective plate allows the reinforcing rib plate to bear the main reinforcing support role. The setting of the length of the hypotenuse of the reinforcing rib plate being equal to the spacing between adjacent vertical columns ensures that the two ends of the reinforcing rib plate can be completely welded to the surface of the vertical column to form a stable triangular support structure. This geometric fit allows the external impact force to be transmitted to the vertical column through the protective plate, and the reinforcing rib plate can effectively restrain the lateral deformation of the vertical column. The thicker reinforcing rib plate provides sufficient bending stiffness and prevents the rib plate itself from buckling and becoming unstable under stress.

[0016] Furthermore, the bottom frame is a rectangular frame formed by welding four bottom crossbeams. The cross-section of the bottom crossbeams is a groove-shaped structure, and the opening of the groove-shaped structure faces the inside of the cage frame.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The bottom frame adopts a rectangular frame composed of four bottom crossbeams welded together, forming a stable bottom support platform. The channel-shaped cross-section structure of the bottom crossbeams with the opening facing inwards allows the two side walls of the channel structure to effectively resist lateral impacts and compressions. The channel-shaped cross-section has a large bending section modulus, so the bottom frame is not prone to bending deformation when subjected to vertical loads. The arrangement of the opening facing the inside of the cage frame makes the bottom plane of the channel structure face outwards, which facilitates the close connection between the bottom frame and the vehicle body platform. The internal space of the channel also provides space for accommodating connecting parts and wiring.

[0018] Furthermore, the connector has a bolt structure, with the bolt head located on the upper surface of the bottom frame, and the threaded portion of the connector passing through the bottom frame and extending downward beyond the lower surface of the bottom frame, the extension length of the threaded portion being greater than the thickness of the bottom frame.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The bolt structure of the connector and the design of the bolt head being located on the upper surface of the bottom frame ensure that the bolt head does not protrude from the lower surface of the bottom frame and affect the flatness and fit with the vehicle body. The threaded part passes through the bottom frame and extends downward beyond the lower surface. The setting of the thread extension length being greater than the thickness of the bottom frame provides sufficient engagement length for the threaded part to engage with the threaded connection hole of the vehicle body, ensuring connection strength. The detachable nature of the bolt structure facilitates the installation, replacement and maintenance of the safety cage. When it is necessary to inspect or replace the safety cage, it can be quickly separated simply by loosening the bolts, which improves maintenance efficiency.

[0020] Furthermore, three reinforcing ribs are provided between every two adjacent vertical columns. The three reinforcing ribs are evenly distributed along the height direction of the vertical columns, and the spacing between adjacent reinforcing ribs is equal.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By setting three reinforcing ribs between every two adjacent vertical columns and distributing them evenly along the height direction with equal spacing between adjacent ribs, the vertical columns receive uniform lateral support throughout the entire height range, avoiding local stress concentration and deformation caused by uneven distribution of support points. The three reinforcing ribs divide the vertical columns into four equal segments along the height direction. The reduced length of each segment lowers the slenderness ratio of the columns, effectively improving the overall stability and anti-instability capability of the columns. The evenly distributed reinforcing ribs also ensure that external impact forces can be supported by the nearest reinforcing rib regardless of the height of the cage.

[0022] Furthermore, the cage frame is made of high-strength steel, the protective plate is made of stainless steel sheet, and the surface of the protective plate is polished.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the cage frame is made of high-strength steel, providing sufficient load-bearing capacity and impact resistance; the protective plate is made of stainless steel sheet and the surface is polished; stainless steel has good corrosion resistance and can resist the erosion of the humid environment and corrosive gases underground; the polished surface is smooth and flat, reducing the adhesion of dust and dirt, and facilitating daily cleaning and maintenance; the silvery-white luster of the stainless steel protective plate has good visibility under underground lighting conditions; the reasonable combination of high-strength steel and stainless steel sheet achieves a balance between structural strength and corrosion resistance.

[0024] Furthermore, the height of the vertical column is greater than twice the length of a single side of the top frame, and the weld joint between the protective plate and the vertical column is a continuous weld structure that extends along the entire height of the vertical column.

[0025] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The setting of the vertical column height being more than twice the length of a single side of the top frame makes the safety cage present a longitudinally slender three-dimensional structure, which is adapted to the spatial characteristics of underground roadways where the height is greater than the width. The continuous weld structure between the protective plate and the vertical column extends along the entire height of the column, eliminating the weak points that may exist in the intermittent weld. The continuous weld makes a completely rigid connection between the protective plate and the column. The impact force on the protective plate from any position can be quickly transmitted to the vertical column through the continuous weld. The continuous weld also improves the sealing of the weld joint, preventing underground water and corrosive media from seeping in from the weld gap, and ensuring the long-term reliability of the overall structure.

[0026] Compared with existing technologies, the beneficial effects of the integrated safety cage structure for underground personnel transport vehicles provided by this utility model are as follows: This utility model forms a dual protection system of external protection and internal reinforcement through the rectangular three-dimensional frame structure of the cage frame combined with the outer protective plate and the triangular plate arrangement on the inner side of the reinforcing ribs. The 45-degree angle between the reinforcing ribs and the vertical columns utilizes the stability principle of the triangular structure, allowing external impact forces to be effectively dispersed and transmitted through the hypotenuse, significantly improving the overall impact resistance of the safety cage. The I-shaped cross-section structure of the vertical columns and the rectangular tubular cross-section design of the top frame achieve lightweighting while ensuring sufficient strength. The arc-shaped plate structure of the protective plate deflects external impact forces, reducing the vertical impact component. The grooved cross-section structure of the bottom frame provides... A robust bottom support and bolted connectors ensure a secure connection to the personnel carrier body. Three evenly distributed reinforcing ribs between every two adjacent uprights guarantee uniform lateral support throughout the entire height range. The cage frame utilizes a combination of high-strength steel and stainless steel protective plates, achieving a balance between structural strength and corrosion resistance. Continuous welded seams eliminate weak points and improve sealing. The integrated structural design avoids the weak points found in modular structures. All components are welded together to form a rigid whole, giving the safety cage excellent impact and deformation resistance under complex underground working conditions. This effectively ensures the safety of personnel operating underground. Furthermore, the rational structural design and material selection reduce manufacturing and maintenance costs, improving the safety cage's economy and practicality. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is an example diagram of an integrated safety cage structure for an underground personnel transport vehicle;

[0029] Figure 2 A top view of an integrated safety cage structure for an underground personnel transport vehicle;

[0030] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Cage frame; 11. Top frame; 12. Bottom frame; 13. Vertical columns; 20. Protective plate; 30. Reinforcing ribs. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figures 1-3 The diagram shows an example of an integrated safety cage structure for an underground personnel transport vehicle provided by this utility model. It includes a cage frame 10, protective plates 20, reinforcing ribs 30, and connectors. The cage frame 10 is a rectangular three-dimensional frame structure, consisting of a top frame 11, a bottom frame 12, and four vertical columns 13 connecting the top and bottom frames 11 and 12. The protective plates 20 are located on the outer side of the cage frame 10 and are connected to the vertical columns 13 by welding. The reinforcing ribs 30 are located on the inner side of the cage frame 10, with both ends welded to two adjacent vertical columns 13. The reinforcing ribs 30 have a triangular plate-like structure, and their hypotenuses form a 45-degree angle with the vertical columns. The connectors are located at the four corners of the bottom frame 12, passing through the bottom frame and extending downwards for connection to the personnel transport vehicle body.

[0035] The specific operation or usage method is as follows: During installation, first place the personnel transport vehicle body on a flat ground or track, ensuring the vehicle body surface is clean and free of debris. Then, align the bottom frame of the safety cage with the preset installation position on the vehicle body, ensuring the threaded parts of the connectors align with the threaded holes on the vehicle body. Screw the threaded parts of the connectors into the threaded holes on the vehicle body one by one, and use a torque wrench to tighten the connectors to the specified torque value, ensuring the bottom frame is tightly fitted to the vehicle body surface without gaps. During tightening, each connector should be tightened in a diagonal sequence to avoid deformation of the bottom frame due to uneven force. After installation, check the tightness of each connector, confirming that the bolt heads are completely flush with the upper surface of the bottom frame. In daily use, workers enter the cage through the opening and should stand evenly distributed to avoid concentrating on one side and causing imbalance. After the personnel transport vehicle starts, the safety cage moves along with the vehicle body. When traveling in the underground roadway, the convex surface of the arc-shaped protective plate faces outward. When encountering falling objects from the roadway roof or lateral protrusions, the falling objects first impact the arc-shaped protective plate. The impact force is deflected along the arc surface and transmitted to the vertical column. The inner reinforcing ribs restrain the deformation of the column and distribute the force to the adjacent columns. The entire safety cage maintains structural integrity without significant deformation. During regular maintenance, check whether the welds between the protective plate and the vertical column are intact and without cracks, check whether the welds between the reinforcing ribs and the column are firm, and check the tightness of the connecting parts. Any weld cracks found should be repaired by welding in time. Loose connecting parts should be retightened to the specified torque. If significant deformation or structural damage is found in the safety cage during use, it should be stopped immediately and repaired or replaced.

[0036] In the above technical solution, the cross-section of the vertical column is I-shaped, and the thickness of the web of the I-shaped structure is less than the thickness of the flange.

[0037] Furthermore, in the above technical solution, the top frame 11 is formed by welding four transverse connecting beams to form a rectangular frame. The two ends of the transverse connecting beams are respectively welded to the top of the vertical column, and the cross-section of the transverse connecting beams is a rectangular tubular structure.

[0038] Furthermore, in the above technical solution, the protective plate 20 has an arc-shaped plate structure, the arc-shaped convex surface of the protective plate 20 faces the outside of the cage frame, the upper edge of the protective plate 20 is flush with the lower surface of the top frame 11, and the lower edge of the protective plate 20 is flush with the upper surface of the bottom frame.

[0039] Furthermore, in the above technical solution, the thickness of the reinforcing rib 30 is greater than the thickness of the protective plate, and the length of the hypotenuse of the reinforcing rib 30 is equal to the distance between two adjacent vertical columns 13.

[0040] Furthermore, in the above technical solution, the bottom frame 12 is formed by welding four bottom crossbeams to form a rectangular frame. The cross-section of the bottom crossbeams is a groove-shaped structure, and the opening of the groove-shaped structure faces the inside of the cage frame.

[0041] Furthermore, in the above technical solution, the connector is a bolt structure, the bolt head of the connector is located on the upper surface of the bottom frame, the threaded portion of the connector passes through the bottom frame and extends downward beyond the lower surface of the bottom frame, and the extension length of the threaded portion is greater than the thickness of the bottom frame.

[0042] Furthermore, in the above technical solution, three reinforcing ribs 30 are provided between every two adjacent vertical columns. The three reinforcing ribs are evenly distributed along the height direction of the vertical columns, and the spacing between two adjacent reinforcing ribs 30 is equal.

[0043] Furthermore, in the above technical solution, the cage frame 10 is made of high-strength steel, the protective plate is made of stainless steel sheet, and the surface of the protective plate is polished.

[0044] Furthermore, in the above technical solution, the height of the vertical column 13 is greater than twice the length of one side of the top frame 11, and the weld joint between the protective plate 20 and the vertical column 13 is a continuous weld structure, which extends along the entire height of the vertical column.

[0045] Specific Embodiment 1: In this embodiment, the overall height of the safety cage is 1800mm, the width is 900mm, and the depth is 800mm. The four vertical columns of the cage frame are made of I-beams, specifically No. 10 I-beams, with a cross-sectional height of 100mm, a web thickness of 5.5mm, a flange width of 68mm, and a flange thickness of 8.5mm. The material is Q345B high-strength structural steel. The four columns are located at the four corners of the rectangular frame, and the distance between two adjacent columns is 900mm in the width direction and 800mm in the depth direction. The top frame is constructed by welding four rectangular tubular transverse connecting beams. The rectangular tubes are 80mm x 60mm in size, with a wall thickness of 4mm, and are made of Q235B carbon structural steel. The four transverse connecting beams are welded at the top to form a rectangular frame. The two ends of each transverse connecting beam are fully penetrated welded to the top of the vertical column, with a weld height of 6mm. The bottom frame is constructed from four welded channel beams. The channel steel is No. 10 channel steel, with a cross-sectional height of 100mm, a leg width of 48mm, a web thickness of 5.3mm, and a flange thickness of 8.5mm. The material is Q345B high-strength structural steel. The openings of the channel steel face inwards towards the cage frame. The four channel beams are welded at the bottom to form a rectangular frame. The protective plates are made of 304 stainless steel plates with a thickness of 3mm. The stainless steel plates are cold-bent to form an arc-shaped plate structure with a radius of curvature of 1200mm. The convex surface of the arc faces outwards towards the cage frame. Each protective plate is 1800mm high, and the width varies from 900mm to 800mm depending on the installation position. The protective plates are welded to the vertical columns via continuous welds. The welds are double-sided fillet welds with a weld leg height of 5mm, extending continuously along the entire height of the vertical columns. The surface of the protective plates is polished after being sanded with 320-grit sandpaper, achieving a surface roughness of Ra0.The 8-micron-sized reinforcing ribs are made of 6mm thick Q345B high-strength steel plates. Each reinforcing rib is an isosceles right-angled triangular plate structure with two right-angled sides of 560mm and a hypotenuse of 792mm. The hypotenuse forms a 45-degree angle with the vertical column. Three reinforcing ribs are installed on the inner side between every two adjacent vertical columns, positioned at 450mm, 900mm, and 1350mm from the bottom frame along the column height. The spacing between adjacent reinforcing ribs is 450mm. The two right-angled sides of each reinforcing rib are welded to the two adjacent vertical columns using continuous fillet welds with a weld leg height of 7mm. The connectors use M16 high-strength bolts made of 35CrMoA alloy structural steel with a blackened surface. The bolt heads are hexagonal, with a width across flats of 24mm, a head thickness of 10mm, and a thread length of 80mm. The bolt has a pitch of 2mm and a mounting hole of 17mm diameter at each of the four corners of the bottom frame. The bolt head is located on the upper surface of the bottom frame, and the threaded portion passes through the bottom frame and extends downwards 60mm beyond the lower surface of the bottom frame. The threaded portion mates with the threaded hole on the personnel carrier body. The tightening torque is 200 Nm. The total weight of the entire safety cage is approximately 280 kg. During underground operation, the safety cage can withstand a 5000 N impact force from the top and a 3000 N compressive force from the side without permanent deformation. The triangular plate structure and 45-degree bevel of the reinforcing ribs effectively disperse external impact forces onto multiple vertical columns. The arc-shaped structure of the protective plate causes the impacting object to slide and deflect along the arc surface, reducing the vertical impact component. Continuous welds ensure rigid connections between components. The overall structure exhibits excellent reliability and safety under harsh underground working conditions.

[0046] Specific Embodiment 2: This Embodiment 2 is based on Embodiment 1, with the addition of an anti-slip texture structure on the outer surface of the protective plate. The anti-slip texture is formed on the surface of the stainless steel plate using laser etching technology. The texture is in the form of horizontal stripes with a stripe spacing of 15mm, a stripe depth of 0.3mm, and a stripe width of 3mm. The anti-slip texture is evenly distributed along the height direction of the protective plate, extending upwards from the upper surface of the bottom frame to a position 500mm from the top frame. The anti-slip texture increases the friction coefficient of the outer surface of the protective plate. When underground personnel need to hold onto the outside of the safety cage in narrow tunnels, the anti-slip texture provides reliable grip friction, preventing hands from slipping. The texture surface formed by laser etching is smooth and burr-free, and will not scratch gloves or skin. The shallow texture depth does not affect the overall strength of the protective plate. The anti-slip texture also increases the surface area of ​​the protective plate, which is conducive to the rapid drainage of moisture in the humid underground environment, reducing water accumulation on the surface of the protective plate and improving safety and comfort during use.

[0047] Specifically, the principle of this utility model is as follows: This utility model adopts a structural design concept of external protection and internal reinforcement. A protective plate is set on the outside of the cage frame to form the first protective barrier, and reinforcing ribs are set on the inside of the cage frame to form an internal support system. The reinforcing ribs adopt a triangular plate structure and form a 45-degree angle with the vertical columns. Utilizing the geometric stability of the triangular structure and the mechanical transmission characteristics of the hypotenuse, when an external impact force acts on the protective plate, the impact force is first borne by the arc-shaped protective plate. The arc structure causes the impact force to be transmitted along the tangent direction of the arc surface. The deflection reduces the impact force component perpendicular to the protective plate. The impact force is then transferred to the vertical column through the welded connection between the protective plate and the vertical column. At this point, the inner reinforcing ribs provide support. The hypotenuse of the reinforcing ribs decomposes the lateral force on the vertical column into compressive or tensile forces along the hypotenuse and transfers them to adjacent vertical columns, achieving distributed transmission of impact force among multiple columns. The triangular plate-like reinforcing ribs also constrain the lateral deformation of the vertical column, significantly improving its bending stiffness. The I-shaped cross-section structure of the vertical column... This design gives the columns a large section modulus of bending resistance. The two flanges bear tensile and compressive stresses respectively, forming a couple to resist bending moment. The web bears shear stress and transmits shear force. This stress distribution gives the I-shaped columns excellent load-bearing capacity when bent. The rectangular tubular transverse connecting beams of the top frame form a closed section with large torsional and bending stiffness, effectively distributing the top impact force to the four columns. The channel-shaped crossbeams of the bottom frame provide stable bottom support. The two side walls of the channel section resist lateral forces, and the bottom plane bears vertical loads. The connecting parts are threaded to firmly fix the bottom frame to the vehicle body, making the safety cage and the vehicle body an integral load-bearing structure. The protective plate and the vertical columns are connected by continuous welds, eliminating stress concentration points and weak points that may exist in discontinuous welds, making the protective plate and the columns form a completely rigid connection. Through the reasonable structural design and mutual cooperation of the above components, this utility model achieves effective dispersion and transmission of external impact force and reliable support of the internal structure, giving the safety cage excellent impact resistance and deformation resistance.

Claims

1. An integral safety cage structure for an underground personnel transport vehicle, comprising a cage frame, protective plates, reinforcing ribs, and connectors; characterized in that, The cage frame is a rectangular three-dimensional frame structure, consisting of a top frame, a bottom frame, and four vertical columns connecting the top and bottom frames. Protective plates are installed on the outer side of the cage frame and are connected to the vertical columns by welding. Reinforcing ribs are installed on the inner side of the cage frame, with each end welded to two adjacent vertical columns. The reinforcing ribs have a triangular plate-like structure, and their hypotenuses form a 45-degree angle with the vertical columns. Connectors are located at the four corners of the bottom frame, passing through the bottom frame and extending downwards for connection to the vehicle body.

2. The integral safety cage structure for an underground personnel transport vehicle according to claim 1, characterized in that, The cross-section of the vertical column is I-shaped, and the thickness of the web of the I-shaped structure is less than the thickness of the flange.

3. The integral safety cage structure for an underground personnel transport vehicle according to claim 2, characterized in that, The top frame is a rectangular frame formed by welding four horizontal connecting beams. The two ends of the horizontal connecting beams are welded to the top of the vertical columns, and the cross-section of the horizontal connecting beams is a rectangular tubular structure.

4. The integral safety cage structure for an underground personnel transport vehicle according to claim 3, characterized in that, The protective plate has an arc-shaped structure, with the arc-shaped convex surface of the protective plate facing the outside of the cage frame. The upper edge of the protective plate is flush with the lower surface of the top frame, and the lower edge of the protective plate is flush with the upper surface of the bottom frame.

5. The integral safety cage structure for an underground personnel transport vehicle according to claim 4, characterized in that, The thickness of the reinforcing rib is greater than the thickness of the protective plate, and the length of the hypotenuse of the reinforcing rib is equal to the distance between two adjacent vertical columns.

6. The integral safety cage structure for an underground personnel transport vehicle according to claim 5, characterized in that, The bottom frame is a rectangular frame formed by welding four bottom crossbeams. The cross-section of the bottom crossbeams is a groove-shaped structure, and the opening of the groove-shaped structure faces the inside of the cage frame.

7. The integral safety cage structure for an underground personnel transport vehicle according to claim 6, characterized in that, The connector is a bolt structure, with the bolt head located on the upper surface of the bottom frame. The threaded portion of the connector passes through the bottom frame and extends downward beyond the lower surface of the bottom frame, with the extension length of the threaded portion being greater than the thickness of the bottom frame.

8. The integral safety cage structure for an underground personnel transport vehicle according to claim 7, characterized in that, The reinforcing ribs are arranged in three pieces between every two adjacent vertical columns. The three reinforcing ribs are evenly distributed along the height direction of the vertical columns, and the spacing between two adjacent reinforcing ribs is equal.

9. The integral safety cage structure for an underground personnel transport vehicle according to claim 8, characterized in that, The cage frame is made of high-strength steel, and the protective plate is made of stainless steel sheet with a polished surface.

10. The integral safety cage structure for an underground personnel transport vehicle according to claim 9, characterized in that, The height of the vertical column is greater than twice the length of one side of the top frame, and the weld joint between the protective plate and the vertical column is a continuous weld structure that extends along the entire height of the vertical column.

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