Closed trestle belt conveyor

Abstract

The utility model provides a closed type trestle belt conveyor which comprises a tail frame, a head frame and a plurality of trestle middle frames arranged between the tail frame and the head frame, each trestle middle frame comprises a rectangular frame and a walking corridor arranged on one side of the rectangular frame, and a closed structure is arranged on the outer side of the rectangular frame. Groove-shaped carrier rollers are arranged on the upper portion of the rectangular frame at intervals, parallel lower carrier rollers are arranged on the lower portion of the inner side of the rectangular frame at intervals, a turnabout drum is arranged on the tail frame, a transmission drum is arranged on the head frame, and a driving mechanism used for driving the transmission drum is arranged on the outer side of the head frame. And a conveying belt is wound among the turnabout drum, the groove-shaped carrier roller, the transmission drum and the parallel lower carrier roller. According to the closed type trestle belt conveyor, the rectangular frame for arranging the belt and the walking corridor are combined into a whole to be designed into the trestle middle frame, and compared with a structure that a supporting trestle and a belt conveyor support are separately arranged in a traditional trestle belt conveyor, the occupied space of the trestle is reduced, the use amount of steel structure materials is also greatly reduced, and therefore the manufacturing cost is effectively saved.

Description

Technical Field

[0001] The utility model relates to the technical field of material conveying equipment, in particular to a closed trestle belt conveyor. Background Art

[0002] Steel structure trestles are the dominant structure of trestles at the present stage and are the main industrial structures for carrying belt conveyor equipment or pipeline conveying equipment. With the requirements of environmental protection, when the trestle belt conveyor is applied outdoors, a fully enclosed structure is generally required. The current traditional design separates the supporting trestle from the belt conveyor support. The belt conveyor support only bears the weight of the belt conveyor itself and does not participate in the force of the overall structure. Therefore, for the trestle, both the belt conveyor and its support are its loads, and at the same time, it also has to bear other loads such as wind loads and icing. Since it bears a large load, relatively more materials are used in its structure, making the volume of the entire trestle belt conveyor relatively large and its manufacturing cost relatively high. Summary of the Invention

[0003] The utility model provides a closed trestle belt conveyor, which cleverly designs the belt conveyor support to ensure its stiffness and uses it as a part of the trestle, reducing the material consumption of the trestle belt conveyor and lowering its cost.

[0004] The utility model adopts the following technical scheme:

[0005] A closed trestle belt conveyor includes a tail frame, a head frame, and a plurality of intermediate trestle frames arranged between the tail frame and the head frame. The tail frame is arranged on the tail support, the head frame is arranged on the head support, and intermediate supports are arranged at intervals at the bottom of the plurality of intermediate trestle frames; the intermediate trestle frame includes a rectangular frame and a walking corridor arranged on one side of the rectangular frame. A closed structure is arranged on the outer side of the rectangular frame. Grooved rollers are arranged at intervals on the upper part of the rectangular frame, and parallel lower rollers are arranged at intervals on the lower inner side of the rectangular frame. A redirecting roller is arranged on the tail frame, a driving roller is arranged on the head frame, and a driving mechanism for driving the driving roller is arranged on the outer side of the head frame. A conveyor belt is wound around between the redirecting roller, the grooved rollers, the driving roller, and the parallel lower rollers.

[0006] Preferably, it further includes a vertical weight tensioning device. Vertical brackets are respectively arranged on the front and rear sides of two intermediate supports close to the head frame through cross bars. A hanging bracket is slidably arranged on the relative inner sides of the vertical brackets; the vertical weight tensioning device includes a tensioning roller and a fixing frame. The tensioning roller is arranged on one side of the vertical bracket through the hanging bracket, a counterweight box is arranged at the lower end of the tensioning roller, the fixing frame is arranged inside the rectangular frame, and two deflecting rollers are rotatably arranged on the fixing frame and are arranged along the width direction of the rectangular frame. The conveyor belt at the lower side bypasses one deflecting roller, the tensioning roller, and the other deflecting roller.

[0007] Preferably, an upper sealing cover is provided at the top of the rectangular frame, side plates for sealing are provided on the front and rear side surfaces of the rectangular frame, and a bottom plate for sealing is provided at the bottom of the rectangular frame; the upper sealing cover, the side plates and the bottom plate together form a closed structure of the rectangular frame.

[0008] Preferably, the rectangular frame includes a number of No. 1 channel steels arranged vertically, a number of No. 1 angle steels, and two No. 2 angle steels. The number of No. 1 channel steels is arranged in two rows side by side and at intervals in the front and rear, and the openings of the No. 1 channel steels face outwards. The number of the No. 1 angle steels is symmetrically arranged at the upper and lower parts of the relative inner sides of the two rows of No. 1 channel steels and is arranged along the length direction of the rectangular frame; the two No. 2 angle steels are symmetrically arranged at the left and right ends of the No. 1 angle steels located at the lower part inside the No. 1 channel steels and are arranged along the width direction of the rectangular frame; No. 1 reinforcing angle steels are arranged at intervals along the width direction between the No. 1 angle steels arranged in the front and rear, and No. 2 reinforcing angle steels are arranged along their diagonals between the No. 1 angle steels arranged up and down; the walking corridor includes a corridor frame body, a guardrail and a steel plate. The corridor frame body is welded on the outer side of the lower part of the rectangular frame, the guardrail is welded on the side of the corridor frame body away from the rectangular frame, and the steel plate is laid on the top surface of the corridor frame body.

[0009] Preferably, the corridor frame body includes No. 2 channel steels arranged along the length direction of the rectangular frame, two No. 3 channel steels, and a number of No. 3 angle steels. The two No. 3 channel steels are respectively arranged on the outer sides of the lower parts of the No. 1 channel steels at the left and right ends along the width direction of the corridor frame body, and one end is welded to the No. 1 channel steel and the other end is welded to the inside of the No. 2 channel steel; the number of the No. 3 angle steels is arranged at intervals along the width direction of the corridor frame body and are respectively close to the No. 1 channel steels. One end of the No. 3 angle steel is welded and fixed to the outer side of the No. 1 angle steel and the No. 1 channel steel, and the other end is welded to the inside of the No. 2 channel steel. The number of No. 3 angle steels is flush with the top of the No. 3 channel steels; No. 3 reinforcing angle steels are arranged along their diagonals between the No. 3 angle steels; the guardrail is welded on the top of the No. 2 channel steels.

[0010] Preferably, the head support includes four No. 4 channel steels vertically distributed in a rectangle and an upper layer platform. Transverse reinforcing channel steels and inclined reinforcing angle steels are arranged between the four No. 4 channel steels; the upper layer platform is a support frame body welded by channel steels. The upper layer platform is arranged on the tops of the four No. 4 channel steels. The headrest is arranged on the upper layer platform. A steel plate is laid on the upper layer platform outside the headrest, and a circle of upper guardrails is arranged on the upper layer platform.

[0011] Preferably, a lower layer platform is arranged on the inner side of the middle part of the head support. The lower layer platform is a support frame body welded by channel steels, is inclined and arranged in the middle of the four No. 4 channel steels, and its high end extends out of the channel steels; a circle of lower guardrails is arranged on the lower layer platform.

[0012] Preferably, the intermediate support includes two No. 5 channel steels arranged vertically and several No. 6 channel steels. The several No. 6 channel steels are arranged at intervals between the two No. 5 channel steels, and a No. 6 channel steel located above the two No. 5 channel steels is flush with the tops of the two No. 5 channel steels. The length of the No. 5 channel steel is equal to the width of the intermediate frame of the trestle. No. 4 reinforcing angle steels are arranged along the diagonals between the No. 6 channel steels.

[0013] Preferably, No. 7 channel steels are respectively inclinedly arranged on the left and right sides of the upper parts of the two No. 5 channel steels of the intermediate frame, and the other ends of the No. 7 channel steels are arranged at the bottom of the intermediate frame of the trestle.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows: For this enclosed trestle belt conveyor, the rectangular frame for arranging the belt and the walking corridor are combined into one and designed as the intermediate frame of the trestle. Compared with the structure of the traditional trestle belt conveyor in which the support trestle and the belt conveyor support are separately arranged, the space occupied by the trestle is reduced, and the amount of steel structure materials used is also greatly reduced, thus effectively saving the manufacturing cost. At the same time, since the weight of the intermediate frame of the trestle is reduced, the intermediate support for supporting the intermediate frame of the trestle is also designed with a flattened reinforcement, and the amount of steel structure materials used is correspondingly reduced, further saving the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural view of the present utility model with the walking corridor and the upper guardrail hidden.

[0016] Figure 2 It is Figure 1 the enlarged view of part A in

[0017] Figure 3 It is Figure 1 the schematic structural view of the intermediate frame of the trestle connected to the tail frame in

[0018] Figure 4 It is Figure 3 the left view of

[0019] Figure 5 It is the top view of the rectangular frame without the closed structure and the corridor frame body on one side.

[0020] Figure 6 It is the schematic structural view of the head support.

[0021] Figure 7 It is Figure 6 the left view of the head support in

[0022] Figure 8 It is the side view of the intermediate support and the intermediate frame of the trestle on its top.

[0023] Figure 9 It is Figure 8 the left view of the intermediate support in

[0024] Figure 10 is Figure 8 a schematic structural view of the middle frame of the middle trestle bridge.

[0025] In the figure: 1, tail frame; 2, head frame; 3, middle support; 4, tail support; 5, head support; 6, rectangular frame; 7, walking corridor; 8, trough idler; 9, parallel lower idler; 10, conveyor belt; 11, upper sealing cover; 12, vertical support; 13, hanger; 14, tensioning roller; 15, fixed frame; 16, counterweight box; 17, redirecting roller; 31, No. 5 channel steel; 32, No. 6 channel steel; 33, No. 4 reinforcing angle steel; 34, No. 7 channel steel; 51, No. 4 channel steel; 52, upper platform; 53, upper guardrail; 54, lower platform; 55, lower guardrail; 61, No. 1 channel steel; 62, No. 1 angle steel; 63, No. 2 angle steel; 64, No. 1 reinforcing angle steel; 65, No. 2 reinforcing angle steel; 71, corridor frame; 72, guardrail; 73, steel plate; 711, No. 2 channel steel; 712, No. 3 channel steel; 713, No. 3 angle steel; 714, No. 3 reinforcing angle steel. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0027] As Figure 1 shown, a closed-type trestle belt conveyor of the present invention includes a tail frame 1, a head frame 2, and a plurality of middle frames of the trestle bridge arranged between the tail frame 1 and the head frame 2. The tail frame 1 is arranged on the tail support 4, and the head frame 2 is arranged on the head support 5. The tail support 4 and the head support 5 are respectively a kind of steel truss, which is used to support the tail frame and the head frame, and at the same time has an installation platform to facilitate the installation and maintenance of the tail frame and the head frame. A plurality of middle supports 3 are arranged at intervals at the bottom of the middle frames of the trestle bridge. Through the ingenious design of the middle frames of the trestle bridge and the middle supports, while ensuring its rigidity, the material consumption of the trestle belt conveyor is reduced. The middle frame of the trestle bridge includes a rectangular frame 6 and a walking corridor 7 arranged on one side of the rectangular frame 6. A closed structure is arranged on the outside of the rectangular frame 6. Trough idlers 8 are arranged at intervals on the upper part of the rectangular frame 6. Parallel lower idlers 9 are arranged at intervals on the inner lower part of the rectangular frame 6. A redirecting roller is arranged on the tail frame 1, and a driving roller is arranged on the head frame 2. A driving mechanism for driving the driving roller is arranged on the outside of the head frame. A conveyor belt 10 is wound around the redirecting roller, the trough idler, the driving roller, and the parallel lower idler. In order to see the structure of the entire trestle belt conveyor,Figure 1 The structure is simplified, hiding the walking corridor at the rear, and the guardrails of the head bracket and the tail bracket.

[0028] To ensure the tension of the conveyor belt, as Figure 2 shown, the belt conveyor further includes a vertical weight tensioning device. Vertical brackets 12 are respectively arranged on the front and rear sides of two intermediate brackets 3 near the head frame through cross bars. A hanging bracket 13 is slidably arranged on the relative inner sides of the vertical brackets 12; the vertical weight tensioning device includes a tensioning roller 14 and a fixing frame 15. The tensioning roller 14 is arranged on one side of the vertical bracket 12 through the hanging bracket 13. A counterweight box 16 is arranged at the lower end of the tensioning roller 14. The fixing frame 15 is arranged inside the rectangular frame 6. Two deflecting rollers 17 are rotatably arranged on the fixing frame 15, and the two deflecting rollers 17 are arranged along the width direction of the rectangular frame. The conveyor belt 10 at the lower side bypasses from one deflecting roller, the tensioning roller, and the other deflecting roller. Different weights of counterweight blocks are placed in the counterweight box, which can control the upward or downward movement of the tensioning roller, thereby realizing the tensioning of the conveyor belt.

[0029] In this embodiment, considering that the stiffness and stability of the tail bracket are stronger than those of the intermediate brackets, a feeding port is arranged at the top of the trestle intermediate frame near the tail frame, and buffer idlers are arranged on the trestle intermediate frame below the feeding port. During layout, most of the trestle intermediate frame provided with the feeding port is arranged on the tail bracket, and the tail bracket is used to jointly bear the load of the falling material.

[0030] For environmental protection considerations, both the tail frame and the head frame adopt a closed structure. Since the structural layout of the tail frame and the head frame belongs to common technologies, only a simple description is given here. The tail frame includes a tail frame body and a tail shield arranged on the upper part of the tail frame body. The tail frame body is used to arrange the redirecting roller, and its side and bottom are closed with steel plates. An opening is reserved on one side of the tail frame body and the tail shield for docking with the trestle intermediate frame. The head frame includes a head frame body, a head hopper, and a head shield. The head hopper is arranged inside the head frame body. The head shield is arranged on the top of the head frame body and is connected to the head hopper. The head frame body is used to arrange the driving roller. An opening is arranged on one side of the head frame body, the head hopper, and the head shield for docking with the trestle intermediate frame.

[0031] The closed structure of the rectangular frame is as follows. An upper sealing cover 11 is arranged on the top of the rectangular frame 6. The upper sealing cover 11 is a rectangular structure with an open bottom and is detachably arranged on the top of the rectangular frame 6. Side plates for sealing are arranged on the front and rear sides of the rectangular frame. The side plate on the side close to the walking corridor is detachable for convenient inspection and maintenance, and the side plate on the side far from the walking corridor is welded and fixed; a bottom plate for sealing is arranged at the bottom of the rectangular frame; the upper sealing cover, the side plates, and the bottom plate together constitute the closed structure of the rectangular frame.

[0032] Since the rectangular frame of the belt conveyor is used as a structural part of the trestle, the overall structural stress condition and the load requirements of the belt conveyor itself are fully considered during the design. Therefore, the stiffness requirements for the rectangular frame are relatively high. In this embodiment, the connection stiffness between the trusses of the rectangular frame is increased, and the stiffness of the end frames is increased to improve the spatial integrity and overall stiffness of the rectangular frame.

[0033] To clearly see the structure of the rectangular frame, Figure 3 the intersecting part of the walking corridor and the rectangular frame in Figures 3 - 5 is hidden. As shown in

[0034] The rectangular frame 6 includes a number of No. 1 channel steels 61 arranged vertically, a number of No. 1 angle steels 62, and two No. 2 angle steels 63. The number of No. 1 channel steels 61 are arranged side by side in front and back with two rows spaced apart, and the openings of the No. 1 channel steels 61 face outward, which is used for the butt joint of the rectangular frame and is also convenient for positioning to realize the welding or detachable fixation of the side plates; a number of the No. 1 angle steels 62 are symmetrically arranged at the upper and lower parts of the relative inner sides of the two rows of No. 1 channel steels 61 and are arranged along the length direction of the rectangular frame. The openings of a number of No. 1 angle steels all face inward, which is convenient for the arrangement of No. 2 angle steels, No. 1 and No. 2 reinforcing angle steels; the left and right ends of the No. 1 angle steel 62 are respectively aligned with the No. 1 channel steels 61 at both ends; the two No. 2 angle steels 63 are symmetrically arranged at the left and right ends of the No. 1 angle steel 62 located at the lower part inside the No. 1 channel steel. The No. 2 angle steels 63 are arranged along the width direction of the rectangular frame, which is used to realize the butt joint of the rectangular frame and cooperate with the No. 1 reinforcing angle steel at the lower part, and is also convenient for the installation of the sealing bottom plate; No. 1 reinforcing angle steels 64 are arranged at intervals along the width direction of the rectangular frame between the front and back arranged No. 1 angle steels 62. The No. 1 reinforcing angle steels 64 are located between the two No. 2 angle steels 63 and correspond to the No. 2 channel steels 61. Among them, the upper No. 1 reinforcing angle steels 64 are located between the tops of the two No. 1 angle steels; No. 2 reinforcing angle steels 65 are arranged along the diagonal of the No. 1 angle steels 62 arranged up and down; the walking corridor 7 includes a corridor frame body 71, a guardrail 72, and a steel plate 73. The corridor frame body 71 is welded to the outside of the lower part of the rectangular frame, the guardrail 72 is welded to the side of the corridor frame body 71 away from the rectangular frame, and the steel plate 73 is laid on the top surface of the corridor frame body 71. The overall structure of the rectangular frame is formed by a number of No. 1 channel steels, a number of No. 1 angle steels, and a number of No. 2 angle steels, and the overall stiffness of the rectangular frame is increased by using No. 1 reinforcing angle steels and No. 2 reinforcing angle steels.Further, the corridor frame 71 includes a No. 2 channel steel 711 arranged along the length direction of the rectangular frame, two No. 3 channel steels 712, and several No. 3 angle steels 713. The two No. 3 channel steels 712 are respectively arranged on the outer sides of the lower parts of the No. 1 channel steels 61 at the left and right ends along the width direction of the corridor frame, and the openings face downward for the docking of the corridor frames. One end is welded to the No. 1 channel steel 61, and the other end is welded to the inner side of the No. 2 channel steel 711. The several No. 3 angle steels 713 are arranged at intervals along the width direction of the corridor frame and are respectively close to the No. 1 channel steel 61. One end of the No. 3 angle steel 713 is welded and fixed to the outer side of the No. 1 angle steel 62 and the No. 1 channel steel 61, and the other end is welded to the inner side of the No. 2 channel steel 711. The several No. 3 angle steels 713 are flush with the tops of the No. 3 channel steels 712 to facilitate the laying of steel plates. A No. 3 reinforcing angle steel 714 is arranged along the diagonal line between the No. 3 angle steels 713. The guardrail 72 is welded to the top of the No. 2 channel steel 711. Specifically, the guardrail includes several first uprights and several second uprights. The several first uprights are welded at intervals on the top of the No. 2 channel steel, and the several second uprights are welded at intervals on the several first uprights along the length direction of the corridor frame. The corridor frame is formed by the No. 2 channel steel, two No. 3 channel steels, and several No. 3 angle steels. The entire corridor frame is welded to one side of the lower part of the rectangular frame by using two No. 3 channel steels and several No. 3 angle steels to cooperate to form the middle frame of the trestle. At the same time, the No. 3 reinforcing angle steel is used to strengthen the stiffness and stability of the corridor frame.

[0035] In this embodiment, the head support 5 includes four No. 4 channel steels 51 vertically distributed in a rectangle and an upper platform 52. A transverse reinforcing channel steel and an inclined reinforcing angle steel are arranged between the four No. 4 channel steels 51. The upper platform 52 is a support frame welded by channel steels, and a channel for the head funnel to pass through is reserved in the middle. The upper platform 52 is arranged on the tops of the four No. 4 channel steels 51. The head frame 2 is arranged on the upper platform 52. Steel plates are laid on the upper platform 52 outside the head frame. A circle of upper guardrails 53 is arranged on the upper platform 52.

[0036] Among them, the tail support has the same structure as the head support, but different dimensions. It includes four No. 4 channel steels vertically distributed in a rectangle and an upper platform. A transverse reinforcing channel steel and an inclined reinforcing angle steel are arranged between the four No. 4 channel steels. The upper platform is arranged on the tops of the four No. 4 channel steels. The tail frame is arranged on the upper platform, and steel plates are laid on the upper platform outside the tail frame. A circle of upper guardrails is arranged on the upper platform.

[0037] In order to facilitate the transfer of the materials falling from the head frame, a lower platform 54 is arranged on the inner side of the middle part of the head support 5. The lower platform 54 is a support frame welded by channel steels, is inclined and arranged in the middle of the four No. 4 channel steels, and its high end extends out of the channel steel. A circle of lower guardrails 55 is arranged on the lower platform 54. According to the usage situation, steel plates are selectively laid on the lower platform.

[0038] In this embodiment, the intermediate support 3 includes two No. 5 channel steels 31 arranged vertically and several No. 6 channel steels 32. The several No. 6 channel steels 32 are arranged at intervals between the two No. 5 channel steels 31, and a No. 6 channel steel 32 located at the upper part of the two No. 5 channel steels 31 is flush with the tops of the two No. 5 channel steels 31. The length of the No. 5 channel steel 31 is equal to the width of the intermediate frame of the trestle, or can be slightly greater than the width of the intermediate frame of the trestle. A No. 4 reinforcing angle steel 33 is arranged along the diagonal line between the No. 6 channel steels 32.

[0039] Furthermore, No. 7 channel steels 34 are respectively arranged obliquely on the left and right sides of the upper parts of the two No. 5 channel steels 31 of the intermediate frame, and the other ends of the No. 7 channel steels 34 are arranged at the bottom of the intermediate frame of the trestle. Specifically, the two No. 7 channel steels located on one side of the rectangular frame are welded to the bottom of the adjacent No. 1 angle steel, and the two No. 7 channel steels located on one side of the walking corridor are welded to the bottom of the No. 2 channel steel of the corridor frame.

[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A closed trestle belt conveyor, characterized in that: It includes a tail frame, a head frame, and several sections of trestle intermediate frames arranged between the tail frame and the head frame, the tail frame is arranged on the tail support, the head frame is arranged on the head support, and intermediate supports are arranged at intervals at the bottom of the several sections of the trestle intermediate frames; the trestle intermediate frames include a rectangular frame, a walking corridor arranged on one side of the rectangular frame, a closed structure is arranged on the outer side of the rectangular frame, groove rollers are arranged at intervals on the upper part of the rectangular frame, and parallel lower rollers are arranged at intervals on the inner lower part of the rectangular frame, a redirecting roller is arranged on the tail frame, a transmission roller is arranged on the head frame, and a driving mechanism for driving the transmission roller is arranged on the outer side of the head frame, and a conveyor belt is wound around the redirecting roller, the groove roller, the transmission roller and the parallel lower rollers.

2. The closed trestle belt conveyor according to claim 1, characterized in that: It also includes a vertical weight tensioning device, wherein vertical brackets are respectively arranged on the front and rear sides of the two middle brackets close to the head frame through cross bars, and hangers are slidably arranged on the relatively inner sides of the vertical brackets; the vertical weight tensioning device includes a tensioning roller and a fixed frame, the tensioning roller is arranged on one side of the vertical bracket through the hanger, a counterweight box is arranged at the lower end of the tensioning roller, the fixed frame is arranged on the inner side of a rectangular frame, two direction-changing rollers are rotatably arranged on the fixed frame, and the two direction-changing rollers are arranged along the width direction of the rectangular frame, and the conveyor belt on the lower side bypasses one direction-changing roller, the tensioning roller, and the other direction-changing roller.

3. The closed trestle belt conveyor according to claim 1, characterized in that: An upper sealing cover is arranged on the top of the rectangular frame, side plates for sealing are arranged on the front and rear sides of the rectangular frame, and a bottom plate for sealing is arranged on the bottom of the rectangular frame; the upper sealing cover, side plates and bottom plate together constitute a closed structure of the rectangular frame.

4. The closed trestle belt conveyor according to claim 1 or 2, characterized in that: The rectangular frame includes a number of vertically arranged No. 1 channel steels, a number of No. 1 angle steels, and two No. 2 angle steels. The number of No. 1 channel steels are arranged in parallel front and back and are spaced in two rows, and the openings of the No. 1 channel steels face outward. The number of No. 1 angle steels are symmetrically arranged at the upper and lower parts of the relatively inner sides of the two rows of No. 1 channel steels, and are arranged along the length direction of the rectangular frame; the two No. 2 angle steels are symmetrically arranged at the left and right ends of the No. 1 angle steel located at the lower inner side of the No. 1 channel steel, and are arranged along the width direction of the rectangular frame; No. 1 reinforcing angle steels are spaced along the width direction of the rectangular frame between the front and back arranged angle steels, and No. 2 reinforcing angle steels are arranged along the diagonal lines of the No. 1 angle steels arranged up and down; the walking corridor includes a corridor frame, a guardrail and a steel plate. The corridor frame is welded to the outer side of the lower part of the rectangular frame, the guardrail is welded to the side of the corridor frame away from the rectangular frame, and the steel plate is laid on the top surface of the corridor frame.

5. The closed trestle belt conveyor according to claim 4 is characterized in that: The corridor frame includes No. 2 channel steel, two No. 3 channel steels, and several No. 3 angle steels arranged along the length direction of the rectangular frame. The two No. 3 channel steels are respectively arranged on the outer side of the lower part of the No. 1 channel steel located at the left and right ends along the width direction of the corridor frame, and one end is welded to the No. 1 channel steel, and the other end is welded to the inner side of the No. 2 channel steel; several No. 3 angle steels are arranged at intervals along the width direction of the corridor frame, and are respectively close to the No. 1 channel steel, one end of the No. 3 angle steel is welded and fixed to the outer side of the No. 1 angle steel and the No. 1 channel steel, and the other end is welded to the inner side of the No. 2 channel steel, and several No. 3 angle steels are flush with the top of the No. 3 channel steel; No. 3 reinforcing angle steels are arranged between the No. 3 angle steels along their diagonals; the guardrail is welded to the top of the No. 2 channel steel.

6. The closed trestle belt conveyor according to claim 1, characterized in that: The head support includes four No. 4 channel steels vertically distributed in a rectangular shape and an upper platform, and transverse reinforcing channel steels and inclined reinforcing angle steels are arranged between the four No. 4 channel steels; the upper platform is a support frame welded by channel steels, and the upper platform is arranged on the top of the four No. 4 channel steels. The head frame is arranged on the upper platform, and the upper platform located on the outside of the head frame is paved with steel plates, and a circle of upper guardrails is provided on the upper platform.

7. The closed trestle belt conveyor according to claim 6, characterized in that: A lower platform is arranged on the inner side of the middle part of the head support. The lower platform is a support frame welded by channel steels, obliquely arranged in the middle part of four No. 4 channel steels, and its high end extends out of the channel steel arrangement; a circle of lower guardrail is arranged on the lower platform.

8. The closed trestle belt conveyor according to claim 1, characterized in that: The intermediate support includes two vertically arranged No. 5 channel steels and several No. 6 channel steels. The several No. 6 channel steels are spaced between two No. 5 channel steels, and a No. 6 channel steel located on the upper part of the two No. 5 channel steels is flush with the tops of the two No. 5 channel steels. The length of the No. 5 channel steel is equal to the width of the middle frame of the pier. No. 4 reinforcing angle steels are arranged between the No. 6 channel steels along their diagonals.

9. The closed trestle belt conveyor according to claim 8, characterized in that: No. 7 channel steels are obliquely arranged on the left and right sides of the upper parts of the two No. 5 channel steels of the middle frame, and the other end of the No. 7 channel steel is arranged at the bottom of the middle frame of the trestle.

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