Hinge device for heavy protective door

Abstract

A hinge device for a heavy protective door belongs to the related technical field of protective equipment and comprises a middle hinge shaft, a hinge shaft is arranged in the middle of the middle hinge shaft, and the hinge shaft is used for being connected with a door leaf of the protective door; the hinge chamber is provided with a mounting hole, an elastic assembly is arranged at the bottom of the mounting hole, a bearing assembly is arranged in the mounting hole, the shaft end of the middle hinge shaft is assembled on the bearing assembly and can be rotationally arranged in the mounting hole through the bearing assembly, and the shaft end face of the middle hinge shaft abuts against the elastic assembly; the middle hinge shaft can elastically move in the axis direction of the middle hinge shaft through the elastic assembly. The hinge device for the heavy protective door is more suitable for installation of large and heavy door leaves on a door frame, the opening and closing flexibility of the door leaves can be improved, meanwhile, impact can be buffered, and the probability that the door leaves cannot be opened after the protective door is impacted and fails is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field related to protective equipment, and more specifically, to a hinge device for a heavy-duty protective door. Background Art

[0002] Protective equipment is usually installed at the entrance of the project and is an important part of the overall protection system of the protective project. The research and design of protective equipment for protective projects in my country has gone through more than 40 years and has achieved fruitful results. Protective equipment has formed a complete category, a wide variety, serialization, generalization, and standardization.

[0003] Although there are many types of protective equipment at present, there are still some shortcomings, such as: the materials used for protective equipment are relatively simple, lack of lightweight and high-strength materials, and lack of in-depth research on anti-corrosion measures for protective equipment; the structural form is simple, especially the traditional door leaf form, which cannot meet the high resistance and airtight requirements; the traditional locking system and transmission mechanism control technology need to be innovated, and there should be breakthroughs in ease of operation and operational reliability; rapid repair and closure measures are not perfect enough; research on countermeasures against conventional precision-guided weapons and some new concept weapons needs to be strengthened; there is a lack of professional manufacturers that provide protective equipment for national defense projects. Protective doors are the most important protective equipment for the mouth. In the practice of national defense and civil air defense projects, the width of the door opening of the protective door ranges from tens of centimeters to more than ten meters, and even up to forty meters; the resistance of the door ranges from hundreds of kilopascals to more than ten megapascals. The existing reinforced concrete civil air defense doors and steel structure civil air defense doors in China have defects such as bulky structure, low processing precision, unsightly appearance, poor anti-corrosion performance, and high maintenance costs.

[0004] With the development of weapons and their delivery systems, new tactical technologies have put forward higher resistance requirements for protective doors, and high-resistance protective doors have solved this problem well. At the same time, the application of large protective doors has also exposed some problems: 1. Poor comprehensive protection capability. The gap between the protective door and the door is large, and there is no protective sealing measure. In addition, the outer side of the sliding door leaf is connected to the entrance space, and the shock wave can enter the upper and lower door grooves. When the resistance requirements of the protective door are high, the shock wave pressure leaking into the upper and lower grooves may reach 200kPa to 300kPa or more, which is easy to cause damage to the clamping mechanism, walking mechanism, etc. 2. Backward control operation. The protective doors of some caves still use manual opening and closing methods, and the opening and closing time is long, and the rapid response capability is poor. 3. The door body is bulky. For example, the design weight of the protective door of a certain aircraft shelter reaches 500 tons. This not only brings great difficulties to improving the design resistance and transmission mechanism design, but also inevitably slow response. 4. System engineering theory has not been well promoted and applied in the formulation of tactical and technical requirements for protective doors, engineering design, construction and installation, and maintenance management, and the optimization design theory has not been well promoted in the design of protective doors. Summary of the invention

[0005] 1. Technical issues

[0006] Through the analysis of the current protective equipment, it can be known that when the door leaf is impacted, the hinge structure of the existing door leaf is directly impacted, which will cause the internal structure to deform, making it difficult to open or even impossible to open.

[0007] So, how to provide a new door hinge structure for installing large and heavy door leaves on door frames to improve their opening and closing flexibility, while also being able to buffer impacts and reduce the probability of the door leaves failing to open after impact has become an urgent problem to be solved by technicians in this field.

[0008] (II) Technical solution

[0009] In order to achieve the above object, the present invention provides the following technical solutions:

[0010] The present invention provides a hinge device for a heavy-duty protective door. In the present invention, the hinge device for a heavy-duty protective door comprises:

[0011] An intermediate hinge shaft, a hinge shaft is arranged in the middle of the intermediate hinge shaft, and the hinge shaft is used to connect with the door leaf of the protective door;

[0012] A hinge chamber, wherein the hinge chamber has a mounting hole, an elastic component is arranged at the bottom of the mounting hole, a bearing component is arranged in the mounting hole, the shaft end of the intermediate hinge shaft is assembled on the bearing component and can be rotatably arranged in the mounting hole through the bearing component, the shaft end face of the intermediate hinge shaft is abutted against the elastic component, and the intermediate hinge shaft can elastically move in the axial direction of the intermediate hinge shaft through the elastic component.

[0013] Preferably, in the hinge device for heavy-duty protective doors provided by the present invention, the intermediate hinge shaft includes an intermediate section and an axis end section, the intermediate section is a cylindrical structure of equal diameter, the hinge shaft is fixedly arranged on the intermediate section, the hinge shaft is arranged perpendicular to the intermediate section, and the axis end section is a stepped shaft structure.

[0014] Preferably, in the hinge device for heavy-duty protective doors provided by the present invention, the shaft end section is at least a two-section structure, and in the direction where the middle section points to the shaft end section, the shaft end section includes a sealing section and a bearing mounting section; the mounting hole is a stepped hole structure that matches the shape of the shaft end section, and the shaft end section is completely inserted into the mounting hole.

[0015] Preferably, in the hinge device for heavy-duty protective doors provided by the present invention, the cross-sectional diameter of the middle section is larger than the cross-sectional diameter of the sealing section, and the end surface of the middle section can elastically offset against the hinge chamber.

[0016] Preferably, in the hinge device for heavy-duty protective doors provided by the present invention, a sealing groove is provided in the mounting hole at a position corresponding to the sealing section, and a sealing ring is provided in the sealing groove, and the sealing ring can form a rotating sealing structure with the sealing section.

[0017] Preferably, in the hinge device for heavy-duty protective doors provided by the present invention, in the radial direction of the mounting hole, the width of the sealing groove gradually decreases and forms an annular trapezoidal groove structure; the sealing ring matches the shape of the sealing groove.

[0018] Preferably, in the hinge device for heavy-duty protective doors provided by the present invention, the bearing mounting section is a two-section stepped shaft structure, a spherical roller bearing is arranged on the first bearing mounting section, and a flat-bottomed thrust ball bearing is arranged on the second bearing mounting section; the flat-bottomed thrust ball bearing can be offset against the spherical roller bearing, and the outer edge of the outer ring of the flat-bottomed thrust ball bearing is not less than half the width of the spherical roller bearing.

[0019] Preferably, in the hinge device for heavy-duty protective doors provided by the present invention, the elastic component includes a load-bearing block, which is a truncated cone structure. The load-bearing block includes a contact portion and a truncated cone portion. The contact portion is in complete contact with the intermediate hinge shaft and the flat-bottomed thrust ball bearing. A butterfly spring is mounted on the truncated cone portion. The butterfly spring is compressed and arranged on the truncated cone portion and its end portion is abutted against the bottom of the mounting hole. The end surface of the truncated cone portion and the bottom of the mounting hole are spaced apart, and a rubber spring seat is compressed and arranged between the end surface of the truncated cone portion and the bottom of the mounting hole.

[0020] Preferably, in the hinge device for heavy-duty protective doors provided by the present invention, an oil filling hole is provided on the hinge chamber, the oil filling hole is provided corresponding to the sealing section and is located between the sealing groove and the bearing mounting section, and a straight-through oil pressure cup is provided on the oil filling hole.

[0021] Preferably, in the hinge device for heavy-duty protective doors provided by the present invention, a mounting flange is provided on the rear side of the hinge chamber, and a reinforcing rib is provided between the hinge chamber and the mounting flange, and the hinge chamber, the mounting flange and the reinforcing rib are integrally formed of metal material.

[0022] (III) Beneficial effects

[0023] It can be known from the above structural design that the present invention provides a hinge device for a heavy-duty protective door, which includes: an intermediate hinge shaft, a hinge shaft is arranged in the middle of the intermediate hinge shaft, and the hinge shaft is used to connect with the door leaf of the protective door; a hinge chamber, the hinge chamber has a mounting hole, an elastic component is arranged at the bottom of the mounting hole, a bearing component is arranged in the mounting hole, the shaft end of the intermediate hinge shaft is assembled on the bearing component and can be rotatably arranged in the mounting hole through the bearing component, the shaft end face of the intermediate hinge shaft is against the elastic component, and the intermediate hinge shaft can be elastically movable in the axial direction of the intermediate hinge shaft through the elastic component. Through the above structural design, in the present invention, the hinge includes upper and lower hinge chambers and an intermediate hinge shaft, and the intermediate hinge shaft can be rotatably supported in the upper and lower hinge chambers so that the door can be opened and closed normally. In the present invention, the hinge also includes a spring device (butterfly spring), and the middle hinge axis is supported in its longitudinal direction in the steel spring isolation device in the upper and lower hinge chambers through the load-bearing block (the rubber spring seat mainly plays the role of shock absorption and energy absorption). The advantage of this device is that it can support a large load with a small deflection under the condition of minimum space requirement in the loading direction, and the cost is relatively cheap, and it can be easily applied to a large load. By adding or reducing springs and changing spring stiffness, it can adapt to changes in conditions to withstand large dynamic deformations. It is ensured that when the shock wave acts on the protective door, the hinge mechanism has a certain range of motion, will not get stuck, and can rotate normally. The hinge device for heavy-duty protective doors provided by the present invention is more suitable for the installation of large and heavy door leaves on door frames, which can improve the flexibility of opening and closing the door leaves, and can also buffer the impact, reducing the probability of the protective door failing after the impact and the door leaf being unable to open. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0025] Figure 1 The three views of the overall structure of the protective device (protective door) in the embodiment of the present invention;

[0026] Figure 2 Schematic diagram of the transverse cross-sectional structure of the protective device (protective door) in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the reinforcement frame in an embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of the partial structure of a door leaf in an embodiment of the present invention;

[0029] Figure 5It is a schematic diagram of the partial structure of the door leaf in an embodiment of the present invention;

[0030] Figure 6 Three views of the overall structure of the hinge device for a heavy-duty protective door in an embodiment of the present invention;

[0031] Figure 7 It is a schematic diagram of the longitudinal cross-sectional structure of a hinge device for a heavy-duty protective door in an embodiment of the present invention;

[0032] Figure 8 It is a front view of a hinge device for a heavy-duty protective door in an embodiment of the present invention;

[0033] Fig. 9 A top view of a hinge device for a heavy-duty protective door according to an embodiment of the present invention;

[0034] Fig.10 The three views of the overall structure of the novel locking mechanism in the embodiment of the present invention;

[0035] Fig.11 It is a schematic diagram of the longitudinal cross-section structure of a novel locking mechanism in an embodiment of the present invention;

[0036] Fig.12 It is a front view of a novel locking mechanism in an embodiment of the present invention;

[0037] Fig.13 It is a partial structural cross-sectional view of the novel locking mechanism in an embodiment of the present invention.

[0038] exist Figures 1 to 13 In the figure, the corresponding relationship between the component names and the reference numerals is as follows:

[0039] Door leaf 1, door frame 2, locking system 3, hinge 4, door frame wall 5, reinforcement frame 6;

[0040] Energy absorbing unit 11;

[0041] Door frame body 21, horizontal plate 22;

[0042] Component housing 31, main control gear 32, transmission gear 33, stabilizing sleeve 34, hand wheel 35, hand wheel shaft 36, output shaft 37, lock 38, lock support 39;

[0043] Intermediate hinge shaft 41, hinge chamber 42, spherical roller bearing 43, flat-bottom thrust ball bearing 44, straight-through oil pressure cup 45, bearing block 46, butterfly spring 47, rubber spring seat 48, hinge shaft 49;

[0044] Anchor 51;

[0045] Transverse reinforcement strips 61 , vertical beams 62 , diagonal braces 63 , and longitudinal connecting rods 64 . DETAILED DESCRIPTION

[0046] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention encompasses such modifications and variations within the scope of the appended claims and their equivalents.

[0047] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0048] Please refer to Figures 1 to 13 ,in, Figure 1 The three views of the overall structure of the protective device (protective door) in the embodiment of the present invention; Figure 2 Schematic diagram of the transverse cross-sectional structure of the protective device (protective door) in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the reinforcement frame in an embodiment of the present invention; Figure 4 It is a schematic diagram of the partial structure of a door leaf in an embodiment of the present invention; Figure 5 It is a schematic diagram of the partial structure of the door leaf in an embodiment of the present invention; Figure 6 Three views of the overall structure of the hinge device for a heavy-duty protective door in an embodiment of the present invention;

[0049] Figure 7 It is a schematic diagram of the longitudinal cross-sectional structure of a hinge device for a heavy-duty protective door in an embodiment of the present invention; Figure 8 It is a front view of a hinge device for a heavy-duty protective door in an embodiment of the present invention; Fig. 9 A top view of a hinge device for a heavy-duty protective door according to an embodiment of the present invention; Fig.10 The three views of the overall structure of the novel locking mechanism in the embodiment of the present invention; Fig.11 It is a schematic diagram of the longitudinal cross-section structure of a novel locking mechanism in an embodiment of the present invention; Fig.12 It is a front view of a novel locking mechanism in an embodiment of the present invention; Fig.13It is a partial structural cross-sectional view of the novel locking mechanism in an embodiment of the present invention.

[0050] The present invention provides a new type of protective door, which mainly includes a door leaf 1, a door frame 2, a locking system 3, a hinge 4, a door frame wall 5 and other structures. Starting from the perspectives of protective engineering structure, materials, energy consumption mechanism, etc., the present invention creatively develops a high-efficiency energy absorption component that protects protective engineering structures from explosion shock waves, and proposes a four-tube nested buffer energy absorption system (energy absorption unit 11) composed of four tubes. The new explosion-proof structure composed of the energy absorption unit 11 can provide very high energy absorption efficiency and a relatively stable deformation mode, thereby enhancing the energy absorption capacity of the protective structure. The energy absorption unit 11 is applied to the design and development of the door leaf 1 of the new protective door, so that the protective door can effectively reduce the impact force under the action of the explosion shock wave, reduce the weight of the protective door, and protect the protective structure from shock wave damage.

[0051] In addition, the present invention also designs and prepares a new heavy-duty hinge mechanism that can withstand large lateral forces, as well as a locking mechanism that is reliable, simple, and easy to operate to open and close. The new protective door provided by the present invention is a protective device that is suitable for use in national defense projects and civil air defense projects. Through the structural design of each component, the present invention can have the properties of light weight, high strength, strong environmental adaptability, and easy installation. It can be directly used for the protection of the entrances and exits of important battlefield defense projects to meet the needs of barrier-free passage for large equipment. It can also be applied to other new projects and the reinforcement and reconstruction of existing projects. The present invention will surely produce huge military, social, and economic benefits in the construction of protective projects.

[0052] The structural design of the door leaf 1 of the present invention is as follows: it includes inner and outer panels, left and right longitudinal channel steels, upper and lower sealing plates, and an energy absorbing unit 11. A hook is provided on the door leaf 1, and the entire door leaf 1 is assembled and welded.

[0053] First, weld the left and right longitudinal channel steels to the inner and outer arch panels; then, install the energy absorption unit 11; finally, weld the upper and lower cover plates, hooks and handles. The above steps are applicable to the embodiment in which the vertical section (longitudinal section) is an arc. If the door adopts the embodiment in which the transverse section (horizontal section) is an arc, the channel steel and the cover plate can be swapped.

[0054] In the present invention, the main functions of the door leaf 1 include: resisting shock wave load, achieving sealing function, being able to open and close conveniently, providing installation position for auxiliary mechanisms, etc. In order to ensure the quality of the door leaf 1, it is necessary to ensure that the door leaf 1 has sufficient structural strength, wherein the direction of the four-tube nested buffer energy absorption system structure (energy absorption unit 11) should be perpendicular to the wave-facing direction of the door leaf 1, ensuring that the fitting surface of the door leaf 1 and the door frame 2 should be flat, and the opening positions at various locations should be accurate.

[0055] The structural design of the energy absorbing unit 11 of the present invention is as follows: the energy absorbing unit 11 is a simple and effective energy absorbing element. The energy absorbing unit 11 includes an outer sleeve and an inner sleeve. The outer sleeve and the inner sleeve are both tubular structures. The "tube" has great potential in various applications. It is light in weight and has high impact resistance. For the energy absorbing unit 11, the outer sleeve and the inner sleeve are made of aluminum 6063-T6 or low carbon steel as materials to form thin-walled round tubes. The thickness and diameter of the tube wall are mainly related to the resistance level of the protective door. The relevant parameters can be obtained through computer numerical simulation and experimental research. Aluminum tubes and low carbon steel tubes are selected as core materials because they are similar in size and cost. These two materials are also commonly used in manufacturing. Fillers are nested in the inner sleeve. The fillers are polymer porous foams (it can also be foamed aluminum, honeycomb aluminum and other materials with buffering and energy absorption effects); that is, spontaneous polyurethane (PU), expanded polystyrene (PS) and cross-linked polyethylene (PE). In the production process, once the mixture reaches the required consistency, it is poured into the tube and sealed, and then the polyurethane foam filled tube is placed for at least 24 hours. Cut polystyrene and polyethylene into cylinders with an outer diameter and length that are compatible with the tube and load them into the tube. When the explosion shock wave acts on the outer panel of the door leaf 1, a force diagram of the four-tube nested buffer energy absorption system can be seen. The three internally nested tubes form a stable triangular structure. This structure can provide the highest energy absorption efficiency and the most stable deformation mode, thereby enhancing the energy absorption capacity of the protective structure. In other embodiments of the present invention, foamed aluminum can also be filled. By filling foamed aluminum and increasing the density of foamed aluminum, the maximum deformation deflection of the protective door leaf 1 can be significantly reduced and the impact force and energy absorption efficiency of the protective door leaf 1 can be improved. In addition, filling with foamed aluminum can also avoid a sharp increase in impact force when the tube is densified.

[0056] The four-tube nested buffer energy absorption system (energy absorption unit 11) proposed by the present invention, each energy absorption unit 11 can work together to provide ideal energy absorption performance. The outer sleeve resists the peak pressure through its higher initial collapse load and reduces the load transmitted to the inner sleeve. Then the inner sleeve further reduces the load transmitted inside the energy absorption unit 11 through a lower initial collapse load and a stable load response. The load response of the energy absorption unit 11 is closely related to the diameter and initial collapse load. By adjusting the diameter and thickness of the tube in the energy absorption unit 11, the load response can be customized and controlled according to the special requirements of the application. The energy absorption unit 11 is placed on the outer surface of the explosion-proof door as a separate component and can be replaced after damage.

[0057] As can be seen from the above, the door leaf 1 in the present invention adopts a curved surface structure, and the door leaf 1 is composed of two leafs, the two leafs are open, and the leaf is a curved surface structure. In order to further strengthen the structure of the leaf, the present invention is also provided with a reinforcement frame 6 on the inner side (the concave side) of the leaf. The reinforcement frame 6 is composed of a frame, a plurality of transverse reinforcement strips 61, a plurality of vertical beams 62, a plurality of diagonal braces 63 and a plurality of longitudinal connecting rods 64. The frame is a "mouth" shaped structure, including side beams on both sides and upper and lower beams. The transverse reinforcement strip 61 is horizontally arranged, and the transverse reinforcement strip 61 is a smooth arc. The strip structure, the two ends of the transverse reinforcement strip 61 are fixedly connected to the side beams on both sides and form a curved surface structure on the front side of the door leaf 1, which is used for the installation of the door leaf 1. There are multiple transverse reinforcement strips 61 and they are evenly spaced in the vertical direction. The vertical upright beam 62 is used for the connection and reinforcement between the multiple transverse reinforcement strips 61. The longitudinal connecting rod 64 is arranged between the upper and lower beams and the transverse reinforcement strip 61 (the transverse reinforcement strip 61 horizontally opposite to the upper and lower beams) to reinforce the upper and lower parts of the frame 6. The diagonal brace 63 is arranged at the corner of the frame to increase the connection strength between the components. It should be noted that the purpose of setting the reinforcement frame 6 in the present invention is to increase the structural strength of the door leaf 1 to improve the impact resistance of the door leaf 1. However, the setting of the reinforcement frame 6 should not affect the opening of the door leaf 1, that is, if the door leaf 1 is composed of two leafs, the reinforcement frame 6 should also be divided into two frame units, which are respectively set corresponding to the two leafs. The reinforcement frame structure set by the present invention is more suitable for large-sized single-leaf door leaf structures.

[0058] The structural design of the door frame 2 of the present invention is as follows: the door frame 2 is a steel structure, and the door frame 2 is cast in the concrete door frame wall 5 through the anchor 51. Before pouring the concrete, it should be leveled and straightened, the flatness and verticality tolerances of the support surface are 1.5 mm, and the tolerances of the two diagonals are 2.0 mm. Welding should be performed after adjustment. The exposed metal surface of the door frame 2 should be painted with two coats of anti-rust paint. The temporary angle steel brace 63, steel pipe support and arc bracket of the door frame 2 must be removed after demolding. The welding process should comply with the requirements of the "Steel Structure Welding Code" (GB50661-2011). E4303 welding rods are used, and the welds should meet the GB / T37910.1-2019 Level 2 quality requirements. The same weld is marked only once. The protective door must be installed accurately in horizontal and vertical positions. When the wall concrete is fully solidified, the protective door is still in the closed position. The door can only be opened after the concrete is fully solidified. The protective door must be installed on the wall formwork in the closed position (locked) and firmly fastened to the fasteners inside the wall.

[0059] For the door leaf 1 of the civil air defense door, the present invention also performs structural optimization design: the door leaf 1 of the civil air defense door is assembled from a plurality of door panels, specifically including an outer panel, an inner panel and a side panel, the outer panel is arranged outward (i.e., the side where the impact may occur), and the inner panel is arranged inward. The outer panel adopts an outward bending structure design, and the bending has three forms: extending the vertical center line outward to form the entire outer panel into a curved surface structure (vertical projection is an arc); extending the horizontal center line outward to form the entire outer panel into a curved surface structure (horizontal projection is an arc); extending the midpoint (centroid) of the outer panel outward to form a spherical structure. Regardless of any of the above-mentioned outer panel structural forms, the shape of the inner panel is consistent with the shape of the outer panel. The outer panel and the inner panel are spaced apart (an installation space is formed between the outer panel and the inner panel), and the side panels are encapsulated between the outer panel and the inner panel.

[0060] An energy absorbing unit 11 is arranged in the installation space. The energy absorbing unit 11 includes an outer sleeve, an inner sleeve and a filler. The inner sleeve and the outer sleeve both adopt a circular tube structure. Three inner sleeves are arranged in an outer sleeve. The inner sleeves are abutted against each other and the inner sleeves are abutted against the outer sleeves. The filler is made of foam aluminum material and the filler is completely filled in the inner sleeve.

[0061] In an energy absorbing unit 11, three inner sleeves arranged in an outer sleeve have the same diameter and are arranged in an equilateral triangle. For the convenience of description, it is defined here that one of the three inner sleeves is the front inner sleeve and the other two inner sleeves are arranged in a row as the rear inner sleeves.

[0062] The arrangement of the energy absorbing unit 11 in the installation space is as follows: the energy absorbing units 11 are arranged closely on the inner side surface of the inner panel in sequence, and the front end inner sleeve in the energy absorbing unit 11 faces the inner side surface of the inner panel, and at the same time, the rear end inner sleeve is parallel to the tangent line of the point where the front end inner sleeve is located (the front end inner sleeve faces the inner side surface of the inner panel and is against the inner side surface of the inner panel, and the tangent line of the inner panel at the contact point).

[0063] The door frame 2 includes a door frame body 21 and an anchor 51. The door frame body 21 includes a door frame body 21 unit. A groove structure is arranged on the inner side of the door frame body 21 unit. The outer side of the door frame body 21 unit is a plane structure. Anchors 51 are arranged in the groove structure. When the door frame wall 5 is poured, concrete needs to be completely filled into the groove structure of the door frame body 21 unit. The door frame body 21 units are arranged in sequence in the vertical direction to form a complete single-sided door frame 2. This structural design can increase the bonding strength between the door frame 2 and the door frame wall 5, and meet the requirements for stable installation of large-sized and heavy door leaves 1. In another embodiment of the present invention, the door frame body 21 is an L-shaped strip structure, the door frame body 21 includes a door frame body front and a door frame body side, the hinge 4 is installed on the front of the door frame body, and horizontal plates 22 are arranged at intervals on the inner side of the L-shape of the door frame body 21. A trough structure is formed between the horizontal plates 22, and an anchor 51 is arranged in the trough structure. When the door frame wall 5 is poured, concrete needs to be completely filled into the trough structure of the door frame body 21 unit.

[0064] The new protective door involved in the present invention has the characteristics of light weight, high strength, strong environmental adaptability and easy installation. The new protective door reduces the overall weight of the current civil air defense engineering protective equipment, facilitates daily use and maintenance, reduces the difficulty of installation and debugging, improves the appearance quality, and promotes the upgrading of protective equipment. It can be directly used for the protection of the entrances and exits of important battlefield defense projects to meet the barrier-free passage requirements of large equipment. It can also be applied to other new projects and the reinforcement and reconstruction of existing projects. The present invention will surely produce huge military, social and economic benefits in the construction of protective projects.

[0065] In addition, as a structural improvement focus of the present invention, the present invention provides a hinge device for heavy-duty protective doors, which is suitable for the installation of heavy-duty or large-sized protective doors (specifically, the installation of the door leaf 1 and the door frame 2).

[0066] In the present invention, the hinge device for the heavy-duty protective door includes two parts: 1. an intermediate hinge shaft 41, and 2. a hinge chamber 42. The present invention provides a hinge shaft 49 in the middle of the intermediate hinge shaft 41, and the hinge shaft 49 is used to connect with the door leaf 1 of the protective door. The intermediate hinge shaft 41 is used to be installed on the hinge chamber 42, the hinge chamber 42 is installed on the door frame 2, and the hinge shaft 49 is fixedly connected with the door leaf 1, thereby completing the installation of the door leaf 1 on the door frame 2.

[0067] The middle hinge shaft 41 and the hinge shaft 49 are integrally cast with the same metal material, which can ensure the overall structural strength of the component. One end of the hinge shaft 49 is connected to the middle hinge shaft 41, and the other end of the hinge shaft 49 is designed according to the shape of the outer side surface of the door leaf 1. For example, if the outer side surface of the door leaf 1 is a curved surface structure, the end surface of the other end of the hinge shaft 49 adopts a curved surface structure, which can maintain the maximum contact area with the door leaf 1 without affecting the opening of the door leaf 1, thereby improving the connection strength between the hinge shaft 49 and the door leaf 1. The middle hinge shaft 41 is a stepped circular shaft structure. Specifically, the middle hinge shaft 41 includes a middle section and an axis end section. The middle section is a cylindrical structure of equal diameter. The hinge shaft 49 is fixedly arranged on the middle section. The hinge shaft 49 (the length direction of the hinge shaft 49) is perpendicular to the middle section (the axis direction of the middle section), and the axis end section is a stepped shaft structure. Furthermore, the shaft end section is at least a two-section structure, and in the direction from the middle section to the shaft end section, the shaft end section includes a sealing section and a bearing mounting section; the mounting hole is a stepped hole structure that matches the shape of the shaft end section, and the shaft end section is completely inserted into the mounting hole. Furthermore, the bearing mounting section is a two-section stepped shaft structure, and a spherical roller bearing 43 is arranged on the first bearing mounting section (the length of the first bearing mounting section is the same as the height of the spherical roller bearing 43, and when the spherical roller bearing 43 is installed on the first bearing mounting section, one end face of the spherical roller bearing 43 is against the end face of the sealing section, and the other end of the spherical roller bearing 43 is against the flat-bottomed thrust ball bearing 44), and a flat-bottomed thrust ball bearing 44 is arranged on the second bearing mounting section (the length of the second bearing mounting section is the same as the height of the flat-bottomed thrust ball bearing 44, and when the flat-bottomed thrust ball bearing 44 is installed on the second bearing mounting section, one end face of the flat-bottomed thrust ball bearing 44 is against the other end face of the spherical roller bearing 43, and the other end of the flat-bottomed thrust ball bearing 44 is flush with the end face of the intermediate hinge shaft 41). As can be seen from the above, the flat-bottomed thrust ball bearing 44 can offset the spherical roller bearing 43, and the flat-bottomed thrust ball bearing 44 can provide a certain support force for the spherical roller bearing 43. Therefore, the present invention stipulates that the outer edge of the outer ring of the flat-bottomed thrust ball bearing 44 is not less than half the width of the spherical roller bearing 43. Preferably, the flat-bottomed thrust ball bearing 44 offsets half the width of the spherical roller bearing 43, and the other half of the width of the spherical roller bearing 43 is supported by the mounting hole of the hinge chamber 42. The shaft end of the intermediate hinge shaft 41 is supported by double bearings, which can ensure the smoothness of the rotation of the intermediate hinge shaft 41.

[0068] The hinge chamber 42 is a component for installing the middle hinge shaft 41. The weight of the entire door leaf 1 is transferred to the hinge chamber 42 through the middle hinge shaft 41, and then transferred to the door frame 2 by the hinge chamber 42. In order to improve the firmness of the hinge chamber 42 installed on the door frame 2 and improve the overall structural strength of the entire hinge chamber 42, the present invention is provided with a mounting flange (a thicker flat plate structure) on the rear side surface of the hinge chamber 42 (the side surface for contacting and connecting with the door frame 2), and a reinforcing rib is provided between the hinge chamber 42 and the mounting flange. The hinge chamber 42, the mounting flange and the reinforcing rib are integrally formed of metal material (can be integrally formed of cast iron through a casting process). The hinge chamber 42 has a mounting hole, an elastic component is arranged at the bottom of the mounting hole, a bearing component is arranged in the mounting hole, the axial end of the intermediate hinge shaft 41 is assembled on the bearing component and can be rotatably arranged in the mounting hole through the bearing component, the axial end face of the intermediate hinge shaft 41 is abutted against the elastic component, and the intermediate hinge shaft 41 can elastically move in the axial direction of the intermediate hinge shaft 41 through the elastic component. There are two hinge chambers 42, namely an upper hinge chamber 42 and a lower hinge chamber 42. The two ends of the middle hinge shaft 41 are respectively arranged in the upper hinge chamber 42 and the lower hinge chamber 42. The present invention arranges an elastic component in the hinge chamber 42. After the middle hinge shaft 41 is impacted, the impact energy can be transmitted to the elastic components at both ends through the middle hinge shaft 41. The impact energy is absorbed by the elastic component and elastically buffered by the elastic component, which can greatly reduce the degree of deformation of the hinge chamber 42 and the middle hinge shaft 41 caused by the impact. The hinge device for heavy-duty protective doors provided by the present invention undergoes a small deformation after being impacted and can also ensure that the door leaf 1 is opened smoothly.

[0069] In the present invention, the middle hinge shaft 41 adopts a stepped shaft structure, and all stages are equal diameter circular shafts, and all stages are coaxially arranged. Specifically, the cross-sectional diameter of the middle section is larger than the cross-sectional diameter of the sealing section, and the end face of the middle section can elastically offset the hinge chamber 42.

[0070] The present invention has two bearings installed on the intermediate hinge shaft 41 corresponding to the bearing mounting section, which are a spherical roller bearing 43 and a flat-bottomed thrust ball bearing 44. The bearings need to be lubricated, so the present invention has an oil filling hole on the hinge chamber 42. The oil filling hole is set corresponding to the sealing section and is located between the sealing groove and the bearing mounting section. A straight-through oil pressure cup 45 is set on the oil filling hole. In order to avoid leakage of lubricating oil, the present invention has a sealing groove at the position corresponding to the sealing section in the mounting hole, and a sealing ring is set in the sealing groove. The sealing ring can form a rotating sealing structure with the sealing section. Furthermore, in the radial direction of the mounting hole, the width of the sealing groove gradually decreases and forms an annular trapezoidal groove structure; the shape of the sealing ring matches the shape of the sealing groove.

[0071] For the elastic component, its specific structure is as follows: the elastic component includes a load-bearing block 46, which is a truncated cone structure. The load-bearing block 46 includes a contact portion and a truncated cone portion. The contact portion is in full contact with the intermediate hinge shaft 41 and the flat-bottomed thrust ball bearing 44. A butterfly spring 47 is mounted on the truncated cone portion. The butterfly spring 47 is compressed and arranged on the truncated cone portion and its end portion is abutted against the bottom of the mounting hole. The end face of the truncated cone portion and the bottom of the mounting hole are spaced apart, and a rubber spring seat 48 is compressed and arranged between the end face of the truncated cone portion and the bottom of the mounting hole.

[0072] It can be known from the above structural design that the present invention provides a hinge device for a heavy-duty protective door, which includes: an intermediate hinge shaft 41, a hinge shaft 49 is arranged in the middle of the intermediate hinge shaft 41, and the hinge shaft 49 is used to connect with the door leaf 1 of the protective door; a hinge chamber 42, the hinge chamber 42 has a mounting hole, an elastic component is arranged at the bottom of the mounting hole, and a bearing component is arranged in the mounting hole, the shaft end of the intermediate hinge shaft 41 is assembled on the bearing component and can be rotatably arranged in the mounting hole through the bearing component, the shaft end face of the intermediate hinge shaft 41 is against the elastic component, and the intermediate hinge shaft 41 can elastically move in the axial direction of the intermediate hinge shaft 41 through the elastic component.

[0073] In the above structural design, the hinge 4 includes upper and lower hinge chambers 42 and an intermediate hinge shaft 41, and the intermediate hinge shaft 41 can be rotatably supported in the upper and lower hinge chambers 42 so that the door can be opened and closed normally. In the present invention, the hinge 4 also includes a spring device (butterfly spring 47), and the intermediate hinge shaft 41 is supported in the steel spring isolation device in the upper and lower hinge chambers 42 along its longitudinal direction through the load-bearing block 46 (the rubber spring seat 48 mainly plays the role of shock absorption and energy absorption). The advantage of this device is that it can support a large load with a small deflection under the condition of minimum space requirements in the loading direction, and the cost is relatively cheap, and it can be easily applied to a large load. By increasing or decreasing the spring and changing the spring stiffness to adapt to changes in conditions, it can withstand large dynamic deformation. It is ensured that when the shock wave acts on the protective door, the hinge mechanism has a certain range of motion, will not get stuck, and can rotate normally.

[0074] The present invention provides a novel locking mechanism, namely a locking system 3 installed on a door leaf 1. In the present invention, the novel locking mechanism includes the following components:

[0075] 1. Locking control component.

[0076] The locking control component is a motion form transmission structure, that is, the rotational motion of the hand wheel 35 is transmitted to the conversion component, and then the conversion component converts the motion form, thereby realizing the opening and closing of the door lock.

[0077] Specifically, the locking control component includes a component housing 31, and the component housing 31 is a square housing structure. In other structural forms of the present invention, the component housing 31 can also be a circular housing structure, or a spherical housing structure. The component housing 31 is made of metal material, preferably a casting process. A gear set is arranged in the component housing 31, so a gear installation chamber is arranged inside the component housing 31 according to the layout structure of the gear set. Specifically, a main control gear 32 and a transmission gear 33 meshing with the main control gear 32 are arranged in the component housing 31, and the main control gear 32 and the transmission gear 33 are both helical gears, and the gear axis of the main control gear 32 is perpendicular to the gear axis of the transmission gear 33. There are two transmission gears 33, and the two transmission gears 33 are arranged on opposite sides of the main control gear 32 in the height direction, and are used to synchronously output the rotational motion of the main control gear 32 from two opposite directions. Preferably, the number of teeth of the main control gear 32 is not greater than the number of teeth of the transmission gear 33, especially in the embodiment where the number of teeth of the main control gear 32 is less than the number of teeth of the transmission gear 33, so that a speed reduction transmission structure can be formed, which reduces the rotation operation torque of the hand wheel 35 and facilitates the operation of the locking structure of the present invention. Along the gear axis direction of the main control gear 32, the component housing 31 includes a front housing and a rear housing, the front housing and the rear housing are connected and form a gear installation chamber for installing the main control gear 32 and the transmission gear 33; a first orifice structure (two first orifice structures are provided, and are provided on the front and rear end surfaces of the component housing 31 in the actual installation state) is provided on both the front housing and the rear housing for the insertion of the hand wheel shaft 36, and a second orifice structure (two second orifice structures are provided, and are provided on the upper and lower end surfaces of the component housing 31 in the actual installation state) is provided on the upper and lower sides of the component housing 31 for the installation of the conversion component. The handwheel shaft 36 is arranged through the first orifice structure, and the conversion assembly is arranged through the second orifice structure. In order to improve the installation firmness of the handwheel shaft 36 and the conversion assembly relative to the assembly housing 31, the present invention is that the outer side surface of the front housing is provided with a stabilizing sleeve 34 extending outward relative to the front housing corresponding to the first orifice structure, and the handwheel shaft 36 is rotatably arranged on the stabilizing sleeve 34. By providing the stabilizing sleeve 34, the installation firmness of the handwheel shaft 36 on the assembly housing 31 can be increased. Based on this structural design, the present invention can also provide another stabilizing sleeve 34 extending outward relative to the front housing on the outer side surface of the rear housing corresponding to the first orifice structure, and also additionally provide a stabilizing sleeve 34 on the assembly housing 31 corresponding to the second orifice structure. The outer edges of the front housing and the rear housing are designed with a flange structure, and the fixed connection of the front housing and the rear housing is achieved by bolts. Further, a sealing ring is provided in the stabilizing sleeve 34 to achieve a rotary seal between the stabilizing sleeve 34 and the handwheel shaft 36.

[0078] 2. Handwheel assembly.

[0079] The handwheel assembly includes a handwheel 35 and a handwheel shaft 36. The handwheel 35 is arranged on the handwheel shaft 36. The handwheel shaft 36 is connected to the main control gear 32 for transmitting the rotational motion input by the handwheel 35 to the main control gear 32. The handwheel 35 is a long handle structure. In one embodiment of the present invention, the width of the handwheel 35 is the largest in the middle, and the width gradually decreases toward the two ends. A mounting hole is provided in the middle of the handwheel 35. The handwheel 35 is fitted onto the handwheel shaft 36 through the mounting hole. Nuts are provided on the front and rear sides of the handwheel 35 to clamp the handwheel 35, thereby realizing the fixed installation of the handwheel 35 on the handwheel shaft 36. The middle of the handwheel 35 is installed on the shaft end of the handwheel shaft 36. An extended handle is foldably provided at both ends of the handwheel 35. The extended handle is hinged to the handwheel 35 and can be unfolded or folded as needed. After unfolding, the distance between the handwheel 35 and the midpoint (the midpoint of the handwheel 35) can be increased, thereby reducing the driving force for the rotation of the handwheel 35. In the present invention, the hand wheel 35 and the extended handle are both made of metal materials. In addition, the hand wheel shaft 36 is an integrated structure (metal shaft, preferably a steel shaft structure), the hand wheel shaft 36 is arranged through the component housing 31, and a hand wheel 35 is arranged at each end of the hand wheel shaft 36, so that the door leaf 1 can be opened or closed inside and outside.

[0080] 3. Conversion components.

[0081] The function of the conversion assembly is to convert the rotary motion into the linear telescopic motion. The conversion assembly can convert the rotary motion into the linear telescopic motion. The rotary motion specifically refers to the rotary motion transmitted by the transmission gear 33. The rotary assembly includes a retractable output shaft 37. The linear telescopic motion specifically refers to the linear telescopic motion of the output shaft 37. The rotary assembly is connected to the transmission gear 33 by power. Specifically, the conversion assembly includes an output shaft 37, a gear docking shaft and a mounting sleeve. The mounting sleeve is fixedly arranged on the second aperture structure. One end of the gear docking shaft is connected to the transmission gear 33 by power. The other end of the gear docking shaft is arranged in the mounting sleeve, and a curved track is arranged on the outer side thereof. The gear docking shaft is rotatably connected to the mounting sleeve. One end of the output shaft 37 is used to connect with the lock 38. The other end of the output shaft 37 is arranged in the mounting sleeve, and a fixed slider is arranged thereon. The fixed slider is slidably arranged on the curved track. The output shaft 37 is linearly slidably matched with the mounting sleeve. The fixed slider is matched with the curved track to convert the rotary motion into the linear motion.

[0082] 4. Door lock assembly.

[0083] The door lock assembly includes a lock hole structure for fixing to the door frame 2 and a lock head 38 matched with the lock hole structure. The lock head 38 is connected to the output shaft 37 and can be driven by the connecting shaft to lock or open with the lock head 38. A connecting shaft is arranged between the output shaft 37 and the lock head 38, the connecting shaft is hinged with the output shaft 37, and the connecting shaft is hinged with the lock head 38; preferably, the hinge rotation vector of the connecting shaft and the output shaft 37 is perpendicular to the hinge rotation vector of the connecting shaft and the lock head 38. In order to improve the stability of the movement of the lock head 38, the present invention is provided with a lock head support 39 on the lock head 38, the lock head support 39 is used to be set on the door leaf 1, and the lock head support 39 and the lock head 38 are a linear sliding matching structure. Further, a linear limiting slide groove is arranged on the lock head 38, a screw hole is arranged on the lock head support 39 corresponding to the limiting slide groove, a limiting screw is arranged in the screw hole, and the limiting screw is slidably matched with the limiting slide groove. The lock 38, the connecting rod and the lock support 39 are all made of metal material, preferably stainless steel.

[0084] As can be seen from the above, the present invention provides a new locking mechanism, which includes: a locking control component, the locking control component includes a component housing 31, a main control gear 32 and a transmission gear 33 meshing with the main control gear 32 are arranged in the component housing 31, the main control gear 32 and the transmission gear 33 are both helical gears, the gear axis of the main control gear 32 is perpendicular to the gear axis of the transmission gear 33, two transmission gears 33 are provided, and the two transmission gears 33 are arranged on opposite sides of the main control gear 32 in the height direction, and are used to synchronously output the rotational motion of the main control gear 32 from two opposite directions; a handwheel component, The handwheel assembly includes a handwheel 35 and a handwheel shaft 36, the handwheel 35 is arranged on the handwheel shaft 36, the handwheel shaft 36 is connected to the main control gear 32 for transmitting the rotational motion input by the handwheel 35 to the main control gear 32; a conversion assembly, the conversion assembly can convert the rotational motion into a linear telescopic motion, the rotation assembly includes a telescopic output shaft 37, and the rotation assembly is connected to the transmission gear 33 for power; a door lock assembly, the door lock assembly includes a lock hole structure for being fixedly set on the door frame 2 and a lock head 38 matched with the lock hole structure, the lock head 38 is connected to the output shaft 37 and can be driven by the connecting shaft to lock or open with the lock head 38.

[0085] The invention also designs and prepares a new type of locking mechanism, which rotates through the manual input mechanism to drive the bevel gear to rotate, converting the rotational motion into the linear motion of the connecting rod, so that the connecting rod drives the lock head 38 to move in the lock seat to the lock hole of the door frame 2, completing the opening and closing of the door leaf 1. Through the above structural design, the present invention meets the requirements of the locking operation force and the opening and closing time index, and improves the efficiency of combat readiness conversion. The door body of the new protective door is relatively large, and manual opening and closing are adopted. The precision requirements of the transmission components of the door body are very high. In order to prevent problems such as jamming and collision during the operation of the door body, the processing accuracy of each component must be strictly controlled during the preparation process. The upper and lower hinge seats of the door frame 2 and the hinge 4 of the door leaf 1 are all welded by a robot to ensure the height and welding accuracy of the weld. In addition, the present invention adopts gear transmission, and the rotation of the hand wheel 35 is not restricted and can be rotated to the limit position of the lock head 38, so that the lock head 38 can be fully inserted into the lock hole or withdrawn from the lock hole. The present invention is more suitable for the locking system 3 used for large protective doors, which solves the problem of opening failure existing in the existing locking system 3.

[0086] (1) The present invention creatively develops a highly efficient energy absorption component for protecting structures from explosion shock, namely, a four-tube nested buffer energy absorption system, which has high energy absorption efficiency and a very stable deformation mode. When the system is applied to a protective door, compared with a traditional protective door, the weight of the protective door can be reduced to the maximum extent (reduced by more than 50%), the deflection deformation of the protective door can be reduced, and the protective performance of the protective door can be significantly improved to enhance its ability to resist explosion shock waves. (The explosion resistance of the protective door is significantly improved compared with the existing protective door)

[0087] (2) According to the configuration of the new protective door body, a new heavy-duty hinge mechanism that can withstand large lateral forces is designed and prepared. The hinge mechanism is simple, light and flexible to operate, and can realize easy opening and closing of the door, reasonable load-bearing force, stable operation, no vibration, no noise, easy processing, installation, and maintenance;

[0088] (3) Design and prepare a new locking mechanism, which rotates through the manual input mechanism to drive the bevel gear to rotate, converting the rotational motion into the linear motion of the connecting rod, so that the connecting rod drives the lock head 38 to move in the lock seat to the lock hole of the door frame 2, completing the opening and closing of the door leaf 1, meeting the locking operation force and opening and closing time index requirements, and improving the combat readiness conversion efficiency. The door body of the new protective door is relatively large and is opened and closed manually. The precision requirements of the transmission components of the door body are very high. In order to prevent problems such as jamming and collision during the operation of the door body, the processing accuracy of each component must be strictly controlled during the preparation process. The upper and lower hinge seats of the door frame 2 and the hinge 4 of the door leaf 1 are all welded by robots to ensure the weld height and welding accuracy.

[0089] (4) Propose the processing technology, process and installation method of the new protective door of the complete system.

[0090] (5) For the first time, a lightweight composite material is used to make the explosion-proof structure of the protective door leaf 1. The material has the advantages of light weight, high specific strength, and simple processing technology.

[0091] (6) The door leaf 1 adopts a hollow structure with a double-plate middle layer and a four-tube nested buffer energy absorption system. The tubes are filled with hard polyurethane material (or foam aluminum material) to improve the structural rigidity. This structural form is conducive to fully exerting the material properties and is convenient for adopting the molding process to improve the processing efficiency.

[0092] (7) The newly developed lock has the characteristics of simple structure, easy operation and 38 synchronous lock.

[0093] (8) Compared with reinforced concrete protective doors of the same specifications, the weight of the new protective door leaf 1 is reduced by more than 50%. The installation difficulty is greatly reduced. After installation, it is easy to use, maintain and look beautiful. It has better overcome the shortcomings of the current protective equipment in protective projects, such as being too heavy, easy to damage and difficult to transport and install.

[0094] (9) The material of door leaf 1 has good moisture resistance and is suitable for underground engineering application environment. The lightweight civil air defense door has beautiful appearance, high cost performance and broad prospects for promotion and application.

[0095] (10) This achievement has taken an important step towards solving the problem of lightweight protective equipment for civil air defense projects. It has done groundbreaking work, is highly practical, and has significant combat readiness, social, and economic benefits.

[0096] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hinge device for a heavy-duty protective door, characterized in that: include: An intermediate hinge shaft, a hinge shaft is arranged in the middle of the intermediate hinge shaft, and the hinge shaft is used to connect with the door leaf of the protective door; A hinge chamber, wherein the hinge chamber has a mounting hole, an elastic component is arranged at the bottom of the mounting hole, a bearing component is arranged in the mounting hole, the shaft end of the intermediate hinge shaft is assembled on the bearing component and can be rotatably arranged in the mounting hole through the bearing component, the shaft end face of the intermediate hinge shaft is abutted against the elastic component, and the intermediate hinge shaft can elastically move in the axial direction of the intermediate hinge shaft through the elastic component.

2. The hinge device for heavy duty protective door according to claim 1, characterized in that: The intermediate hinge shaft includes an intermediate section and an end section, the intermediate section is a cylindrical structure of equal diameter, the hinge shaft is fixedly arranged on the intermediate section, the hinge shaft is arranged perpendicular to the intermediate section, and the end section is a stepped shaft structure.

3. The hinge device for heavy-duty protective door according to claim 2, characterized in that: The shaft end section is at least a two-section structure, and in the direction from the middle section to the shaft end section, the shaft end section includes a sealing section and a bearing installation section; The mounting hole is a stepped hole structure that matches the shape of the shaft end section, and the shaft end section is completely inserted into the mounting hole.

4. The hinge device for heavy-duty protective door according to claim 3, characterized in that: The cross-sectional diameter of the middle section is greater than the cross-sectional diameter of the sealing section, and the end surface of the middle section can elastically abut against the hinge chamber.

5. The hinge device for heavy-duty protective door according to claim 3, characterized in that: A sealing groove is arranged in the installation hole at a position corresponding to the sealing section, and a sealing ring is arranged in the sealing groove. The sealing ring can form a rotating sealing structure with the sealing section.

6. The hinge device for heavy-duty protective door according to claim 5, characterized in that: In the radial direction of the mounting hole, the width of the sealing groove gradually decreases and forms an annular trapezoidal groove structure; The sealing ring is consistent with the shape of the sealing groove.

7. The hinge device for heavy-duty protective door according to claim 3, characterized in that: The bearing installation section is a two-section stepped shaft structure, a spherical roller bearing is arranged on the first section of the bearing installation section, and a flat-bottom thrust ball bearing is arranged on the second section of the bearing installation section; The flat-bottom thrust ball bearing can be offset against the spherical roller bearing, and the outer edge of the outer ring of the flat-bottom thrust ball bearing is not less than half the width of the spherical roller bearing.

8. The hinge device for heavy-duty protective door according to claim 1, characterized in that: The elastic component includes a load-bearing block, which is a truncated cone structure. The load-bearing block includes a contact portion and a truncated cone portion. The contact portion is in full contact with the intermediate hinge shaft and the flat-bottomed thrust ball bearing. A butterfly spring is mounted on the truncated cone portion. The butterfly spring is compressed and arranged on the truncated cone portion, and its end portion is abutted against the bottom of the mounting hole. The end surface of the truncated cone portion is spaced apart from the bottom of the mounting hole, and a rubber spring seat is compressed and arranged between the end surface of the truncated cone portion and the bottom of the mounting hole.

9. The hinge device for heavy-duty protective door according to claim 5, characterized in that: An oil filling hole is arranged on the hinge chamber, the oil filling hole is arranged corresponding to the sealing section and is located between the sealing groove and the bearing mounting section, and a straight-through oil pressure cup is arranged on the oil filling hole.

10. The hinge device for heavy-duty protective door according to claim 1, characterized in that: A mounting flange is arranged on the rear side of the hinge chamber, and a reinforcing rib is arranged between the hinge chamber and the mounting flange. The hinge chamber, the mounting flange and the reinforcing rib are integrally formed of metal material.

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