Heavy back door hinge device

Abstract

The utility model belongs to the technical field of hinges, and particularly relates to a heavy rear door hinge device which comprises a front support, a rear support and a rear support. The rear support comprises an inner hanging plate, an outer hanging plate, a rear hanging plate, an inner reinforcing plate and an outer reinforcing plate; an overturning seat; the first hinge assembly comprises a first nut and a first bolt. The second hinge assembly comprises a second nut and a second bolt. The bottom plate is attached to the top face of the side plate of the container, the periphery of the bottom plate and the top face of the side plate of the container are fully welded, the overall rigidity is enhanced, deformation can be effectively resisted, the effect of evenly dispersing stress is achieved, and the connecting strength and the anti-fatigue performance are improved; the outer hanging plate is arranged on the side end face of the door plate, so that the length of a welding seam is increased, the effective bearing area is increased, stress concentration is reduced, and the bearing capacity and the connection firmness are improved; by arranging the inner reinforcing plate and the outer reinforcing plate, the structural strength of the rear support is enhanced, the bearing capacity is improved, and the use requirement of a heavy container can be met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hinge technical field, concretely relates to a heavy rear door hinge device. BACKGROUND

[0002] The rear door hinge device of the mine dump truck is the core component of the vehicle unloading function, which realizes the opening and closing action by connecting the left and right side plates of the rear door and the cargo box. In the traditional design, the hinge is mostly light structure. Although this kind of structure can meet the opening and closing demand under the normal working condition, it has the following significant defects in the extreme operating environment such as mine:

[0003] 1. Insufficient impact resistance: the mine dump truck often transports large mass materials such as boulders, and the instantaneous impact force of the material on the rear door during unloading can easily cause the hinge connection point to crack, the hinge shaft to deform or even the whole to break;

[0004] 2. Low structural strength and durability: not optimized for high-frequency and high-load working conditions, the hinge plate thickness and support form are insufficient to disperse stress, and fatigue damage can easily occur after long-term use. INVENTION CONTENTS

[0005] The utility model discloses a heavy rear door hinge device, which solves the technical problems of insufficient impact resistance and low structural strength and durability of the rear door hinge device in the prior art.

[0006] The utility model discloses a heavy rear door hinge device, which solves the technical problems of insufficient impact resistance and low structural strength and durability of the rear door hinge device in the prior art.

[0007] The front support comprises:

[0008] The bottom plate is arranged above the rear side plate of the cargo box;

[0009] The vertical plate has two blocks and is arranged in parallel and spaced apart, and is arranged on the top surface of the bottom plate;

[0010] The rear support comprises:

[0011] The inner hanging plate is arranged on the outer surface of the door plate;

[0012] The outer hanging plate is arranged on the side end surface of the door plate and is arranged in parallel and spaced apart with the inner hanging plate;

[0013] The rear hanging plate is connected with the inner hanging plate and the outer hanging plate on both sides of the inner surface;

[0014] The inner reinforcing plate is arranged on the side of the inner hanging plate away from the outer hanging plate;

[0015] The outer reinforcing plate is arranged on the side of the outer hanging plate away from the inner hanging plate;

[0016] The turnover seat is arranged in abutment between the two vertical plates at one end and arranged in abutment between the inner hanging plate and the outer hanging plate at the other end;

[0017] The first hinge assembly comprises:

[0018] The first nut;

[0019] The first bolt, the screw rod penetrates the turnover seat and the two vertical plates and is threadedly connected with the first nut;

[0020] The second hinge assembly comprises:

[0021] The second nut;

[0022] The second bolt, the screw rod penetrates the inner reinforcing plate, the inner hanging plate, the turnover seat, the outer hanging plate and the outer reinforcing plate in sequence and is threadedly connected with the second nut.

[0023] The bottom plate is arranged to be in abutment with the top surface of the side plate of the cargo box and is fixed by the way of full welding, thereby forming a continuous and complete connection structure, enhancing the overall rigidity, effectively resisting deformation, evenly dispersing stress, improving the connection strength and fatigue resistance; the outer hanging plate is arranged at the side end surface of the door plate, thereby significantly prolonging the length of the weld, increasing the effective bearing area, reducing stress concentration, and further improving the bearing capacity and connection firmness; the inner reinforcing plate and the outer reinforcing plate are arranged to enhance the structural strength of the rear support and improve the bearing capacity, thereby meeting the use requirements of the heavy cargo box.

[0024] On the basis of the above technical scheme, the scheme of the present application can be further improved as follows:

[0025] Preferably, the front support comprises:

[0026] The first limiting block is arranged on the outer side surface of one of the vertical plates and located above the first bolt and in abutment with the head of the first bolt;

[0027] The first protective cover is arranged on the outer side surface of the other vertical plate and located above the first nut; by adopting the scheme, the impact resistance and disassembly and assembly portability of the first hinge assembly are improved, the connection between the front support and the turnover seat is more reliable, the long-term use stability is ensured, the opening and closing failure of the rear door caused by loose or damaged connection is reduced, and the use efficiency and safety of the cargo box are improved.

[0028] Preferably, the rear support comprises:

[0029] The second limiting block is arranged on the outer side surface of the inner reinforcing plate and located above the second bolt and in abutment with the head of the second bolt;

[0030] A second protective cover is arranged on the outer side of the outer reinforcing plate and above the second nut, which improves the impact resistance and disassembly portability of the second hinge assembly, makes the connection between the rear support and the turnover seat more reliable, helps to ensure long-term stability, reduces the rear door opening and closing failure caused by loose or damaged connection, and improves the use efficiency and safety of the container.

[0031] Preferably, the first nut outer end face is provided with a plurality of first grooves arranged around the axis and radially through, one end of the first bolt is provided with a radially through first insertion hole, and the first insertion hole is inserted with a first plug, both ends of the first plug extend out of the first insertion hole and are respectively clamped in two first grooves; this scheme prevents the first nut from loosening, ensures the stability and reliability of the connection, and improves the maintenance efficiency.

[0032] Preferably, the second nut outer end face is provided with a plurality of second grooves arranged around the axis and radially through, one end of the second bolt is provided with a radially through second insertion hole, and the second insertion hole is inserted with a second plug, both ends of the second plug extend out of the second insertion hole and are respectively clamped in two second grooves; this scheme prevents the second nut from loosening, ensures the stability and reliability of the connection, and improves the maintenance efficiency.

[0033] Preferably, the bottom surface of one of the vertical plates is provided with an opening for discharging accumulated crushed material in the front support; this scheme can discharge the accumulated crushed material between the two vertical plates, thereby protecting the first bolt and ensuring smooth turnover of the hinge.

[0034] Preferably, the front support comprises:

[0035] A reinforcing plate is arranged between the vertical plates and on the side away from the turnover seat; this scheme increases the connection strength and rigidity between the vertical plates, enables the vertical plates to maintain a relatively stable shape when subjected to external force, reduces deformation, improves the carrying capacity of the front support, reduces local stress, enhances the strength and stability of the structure, and improves the impact resistance of the front support.

[0036] Preferably, the reinforcing plate is inclined and the end closer to hinge assembly one is higher than the end away from hinge assembly one; this scheme plays a guiding role, enabling the material falling on the reinforcing plate to roll in the direction away from the turnover seat, avoiding hitting the turnover seat, and thereby improving the stability of the device.

[0037] Preferably, the inner reinforcing plate is circular and the outer reinforcing plate is strip-shaped. This design serves to avoid misalignment and enhances the bending stiffness along the length, preventing bending deformation of the front support and improving the load-bearing capacity of the structure.

[0038] Through the above technical solution, this utility model achieves the following beneficial effects:

[0039] 1. This application, by setting a base plate, can fit against the top surface of the cargo box side panel and be fixed by full welding around the perimeter, thereby forming a continuous and complete connection structure, which enhances the overall rigidity, can effectively resist deformation, play a role in uniformly dispersing stress, and improves the connection strength and fatigue resistance.

[0040] 2. This application enhances the structural strength of the rear support and improves its load-bearing capacity by setting internal and external reinforcing plates, thus meeting the usage requirements of heavy-duty cargo boxes;

[0041] 3. By placing the outer panel on the side end face of the door panel, this application significantly extends the weld length, increases the effective load-bearing area, reduces stress concentration, and thus improves the load-bearing capacity and connection firmness. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the heavy-duty rear door hinge device described in a specific embodiment of this application;

[0044] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0045] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0046] Figure 4 for Figure 1 A schematic diagram of the heavy-duty rear door hinge device from another perspective;

[0047] Figure 5 for Figure 1 A schematic diagram of the front support structure in the heavy-duty rear door hinge device shown.

[0048] Figure 6 for Figure 1Structure diagram of rear support of heavy rear door hinge device shown in the figure;

[0049] Figure 7 For Figure 1 Installation diagram of heavy rear door hinge device shown in the figure;

[0050] Explanation of reference signs:

[0051] 1, front support; 2, rear support; 3, turnover seat; 4, hinge assembly one; 5, hinge assembly two;

[0052] 11, bottom plate; 12, vertical plate; 13, first limiting block; 14, first protective cover; 15, reinforcing plate; 21, inner hanging plate; 22, outer hanging plate; 23, rear hanging plate; 24, inner reinforcing plate; 25, outer reinforcing plate; 26, second limiting block; 27, second protective cover; 41, first nut; 42, first bolt; 43, first bolt; 51, second nut; 52, second bolt; 53, second bolt;

[0053] 121, opening; 411, first groove; 421, first insertion hole; 511, second groove; 521, second insertion hole. DETAILED DESCRIPTION

[0054] The embodiments of the technical scheme of the utility model will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, and therefore only serve as examples, and cannot limit the protection scope of the utility model.

[0055] First of all, it needs to be pointed out that in the following description, some orientation words involved in the technical scheme of the utility model, such as the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like, are all analogically interpreted according to the orientation of the normal parts of the heavy rear door hinge device, and only serve to facilitate the description of the utility model and simplify the description, and are not intended to indicate or imply that the indicated device or element must have a specific orientation, structure and operation, and therefore cannot be understood as a limitation on the utility model.

[0056] In addition, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features, therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features.

[0057] In this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0059] Example:

[0060] like Figure 1 As shown in the figure, this application discloses a heavy-duty rear door hinge device for connecting the rear door and the left and right side panels of the cargo box to realize the opening and closing action. It has the advantages of strong impact resistance, high structural strength and durability. Its specific structure includes: front support 1, rear support 2, flip seat 3, hinge assembly 1 4 and hinge assembly 2 5.

[0061] The front support 1 includes a base plate 11 and a vertical plate 12, which are configured as follows:

[0062] The bottom plate 11 is located above the rear of the side panel of the cargo box and is used to provide an installation base for the front support 1 so that it can be stably installed on the cargo box. It is attached to the top surface of the side panel of the cargo box and fixed by full welding around the perimeter. It has the advantages of strong connection and high structural strength, and is not prone to false welding, incomplete welding and skip welding.

[0063] The upright plate 12 has two pieces, arranged side by side with intervals, and is located on the top surface of the base plate 11, thereby forming a certain space between the two upright plates 12 for cooperating with the flipping seat 3 to realize the flipping function of the hinge device.

[0064] The rear support 2 includes: an inner mounting plate 21, an outer mounting plate 22, a rear mounting plate 23, an inner reinforcing plate 24, and an outer reinforcing plate 25, which are configured as follows:

[0065] The inner mounting plate 21 is located on the outer surface of the door panel to provide an installation position for the rear support 2;

[0066] The outer panel 22 is located on the side end face of the door panel and is arranged side by side with the inner panel 21 at intervals. Its contact area with the door panel is large, which significantly extends the weld length, increases the effective load-bearing area of ​​the weld, and thus improves the load-bearing capacity and connection firmness.

[0067] The inner surfaces of the rear mounting plate 23 are connected to the inner mounting plate 21 and the outer mounting plate 22 on both sides, thereby playing a role in connection and reinforcement, and enhancing the overall stability of the rear support 2.

[0068] The inner reinforcing plate 24 is arranged on the side of the inner hanging plate 21 away from the outer hanging plate 22, and is used for enhancing the structural strength of the inner hanging plate 21 and improving the bearing capacity.

[0069] The outer reinforcing plate 25 is arranged on the side of the outer hanging plate 22 away from the inner hanging plate 21, and is used for enhancing the structural strength of the outer hanging plate 22 and improving the bearing capacity.

[0070] Specifically, the inner hanging plate 21 and the outer hanging plate 22 are made of Q690D steel plates, have very high yield strength and tensile strength, and meanwhile maintain good toughness, so that the structural strength and reliability are ensured.

[0071] The turnover seat 3 is arranged in abutment between the two vertical plates 12 at one end and is arranged in abutment between the inner hanging plate 21 and the outer hanging plate 22 at the other end, and serves as a connecting component between the front support 1 and the rear support 2, and realizes the turnover movement of the rear door.

[0072] The hinge assembly one 4 comprises a first nut 41 and a first bolt 42, which are arranged as follows:

[0073] The first nut 41 is used for cooperating with the first bolt 42 to realize threaded connection;

[0074] The screw rod of the first bolt 42 penetrates the turnover seat 3 and the two vertical plates 12 and is threadedly connected with the first nut 41, and is used for firmly connecting the turnover seat 3 and the front support 1 together, so that the connection stability is ensured.

[0075] The hinge assembly two 5 comprises a second nut 51 and a second bolt 52, which are arranged as follows:

[0076] The second nut 51 is used for cooperating with the second bolt 52 to realize threaded connection;

[0077] The screw rod of the second bolt 52 penetrates the inner reinforcing plate 24, the inner hanging plate 21, the turnover seat 3, the outer hanging plate 22 and the outer reinforcing plate 25 in sequence and is threadedly connected with the second nut 51, and is used for firmly connecting the turnover seat 3 and the rear support 2 together, so that the connection stability is ensured.

[0078] The utility model has the following technical effects:

[0079] 1. The bottom plate 11 is arranged to be in abutment with the top surface of the side plate of the cargo box and is fixed by full welding around the periphery, thereby forming a continuous and complete connecting structure, enhancing the overall rigidity, effectively resisting deformation, evenly dispersing stress, and improving the connecting strength and fatigue resistance;

[0080] 2. The outer hanging plate 22 is arranged on the side end surface of the door plate, thereby significantly prolonging the length of the weld, increasing the effective bearing area, reducing stress concentration, and further improving the bearing capacity and connection firmness;

[0081] 3. By setting the inner reinforcing plate 24 and the outer reinforcing plate 25, the structural strength of the rear support 2 is enhanced, the carrying capacity is improved, and the use demand of the heavy cargo box can be met.

[0082] In some embodiments, as shown in Figure 1 and Figure 4 , the front support 1 comprises: a first limiting block 13 and a first protective cover 14, which are arranged as follows:

[0083] The first limiting block 13 is arranged on the outer side of a vertical plate 12 and above the first bolt 42, and abuts against the head of the first bolt 42;

[0084] The first protective cover 14 is arranged on the outer side of another vertical plate 12 and above the first nut 41.

[0085] Specifically, the first limiting block 13 limits the rotation of the first bolt 42 during installation, facilitating the threaded connection of the first bolt 42 and the first nut 41, and improving the disassembly and portability; it also protects the first bolt 42 from being directly impacted by falling materials, prolonging its service life.

[0086] Specifically, the first protective cover 14 is U-shaped, which can prevent falling materials from directly impacting the first nut 41 and the rod of the first bolt 42 during loading, unloading and transportation, thereby ensuring the normal threading performance and connection strength of the first nut 41 and prolonging its service life.

[0087] Through the above arrangement, the impact resistance and disassembly and portability of the hinge assembly 4 are improved, making the connection between the front support 1 and the turnover seat 3 more reliable, which helps to ensure long-term use stability, reduces the opening and closing failure of the rear door due to loose or damaged connection, and improves the use efficiency and safety of the cargo box.

[0088] In some embodiments, as shown in Figure 1 and Figure 4 , the rear support 2 comprises a second limiting block 26 and a second protective cover 27, which are arranged as follows:

[0089] The second limiting block 26 is arranged on the outer side of the inner reinforcing plate 24 and above the second bolt 52, and abuts against the head of the second bolt 52;

[0090] The second protective cover 27 is arranged on the outer side of the outer reinforcing plate 25 and above the second nut 51.

[0091] Specifically, the second limiting block 26 limits the rotation of the second bolt 52 during installation, thereby facilitating the threaded connection of the second bolt 52 and the second nut 51 and improving the disassembly portability; the second limiting block 26 also protects the second bolt 52 from being directly impacted by falling materials, thereby prolonging the service life.

[0092] Specifically, the second protective cover 27 is U-shaped, which can prevent falling materials from directly impacting the second nut 51 and the rod of the second bolt 52, thereby ensuring the normal screwing performance and connection strength of the second nut 51 and prolonging the service life.

[0093] Through the above arrangement, the impact resistance and disassembly portability of the hinge assembly two 5 are improved, the connection between the rear support 2 and the turnover seat 3 is more reliable, which helps to ensure long-term use stability, reduces the rear door opening and closing failure caused by loose or damaged connection, and improves the use efficiency and safety of the cargo box.

[0094] In some embodiments, as shown in Figure 2 the outer end surface of the first nut 41 is provided with a plurality of first grooves 411 arranged around the axis and radially penetrating, one end of the first bolt 42 is provided with a first insertion hole 421 radially penetrating, and the first insertion hole 421 is inserted with a first bolt 43, both ends of the first bolt 43 extend out of the first insertion hole 421 and are respectively clamped in two first grooves 411.

[0095] When the cargo box is subjected to jolt and vibration during transportation, the ordinary nut and bolt connection may be gradually loosened due to the relative movement between the threads, resulting in connection failure. However, the clamping action of the first bolt 43 and the first groove 411 limits the rotation of the first nut 41 relative to the first bolt 42, thereby ensuring the stability of the connection.

[0096] Through the above arrangement, the first nut 41 is prevented from loosening, the stability and reliability of the connection are ensured, the disassembly process is simple and fast, and the maintenance efficiency is improved.

[0097] In some embodiments, as shown in Figure 3 the outer end surface of the second nut 51 is provided with a plurality of second grooves 511 arranged around the axis and radially penetrating, one end of the second bolt 52 is provided with a second insertion hole 521 radially penetrating, and the second insertion hole 521 is inserted with a second bolt 53, both ends of the second bolt 53 extend out of the second insertion hole 521 and are respectively clamped in two second grooves 511.

[0098] Similarly, the clamping action of the second bolt 53 and the second groove 511 limits the rotation of the second nut 51 relative to the second bolt 52, thereby ensuring the stability of the connection.

[0099] Through the above setting, the second nut 51 is prevented from loosening, the stability and reliability of the connection are ensured, the disassembly process is simple and fast, and the maintenance efficiency is improved.

[0100] In some embodiments, as shown in Figure 5 The bottom surface of a vertical plate 12 is provided with an opening 121 for discharging the accumulated crushed materials in the front support 1.

[0101] It should be noted that during transportation of the container, gravel, sand and other debris often splash and fly, which will accumulate, embed or accumulate in the space between the two vertical plates 12 and are not easy to fall off. When the door is opened, the turnover seat 3 will often squeeze the above-mentioned debris, which will cause deformation, damage, rotation jamming, and other failures of the rear door hinge device after a long time, and eventually lead to the failure to normally open and close the rear door.

[0102] By setting the opening 121, the accumulated crushed materials between the two vertical plates 12 can be discharged, thereby protecting the first bolt 42 and ensuring smooth turnover of the hinge.

[0103] In some embodiments, as shown in Figure 1 and Figure 4 The front support 1 comprises a reinforcing plate 15 arranged between the vertical plates 12 and located on the side of the vertical plates 12 away from the turnover seat 3.

[0104] By setting the reinforcing plate 15, the connection strength and rigidity between the vertical plates 12 can be increased, the vertical plates 12 can maintain a relatively stable shape when subjected to external force, deformation is reduced, the load capacity of the front support 1 is improved, local stress is reduced, the strength and stability of the structure are enhanced, and the impact resistance of the front support 1 is improved.

[0105] Based on the above embodiments, as shown in Figure 4 The reinforcing plate 15 is inclined and the end close to the hinge assembly 4 is higher than the end away from the hinge assembly 4.

[0106] Through the above setting, a guiding effect is achieved, so that the materials falling on the reinforcing plate 15 will roll in the direction away from the turnover seat 3, avoiding hitting the turnover seat 3, thereby improving the stability of the device.

[0107] In some embodiments, as shown in Figure 1 and Figure 4 The inner reinforcing plate 24 is circular and the outer reinforcing plate 25 is strip-shaped.

[0108] The inner reinforcing plate 24 is circular to avoid position, the reinforcing rib is arranged between the inner hanging plate 21 and the top surface of the rear door, the connecting strength is improved, the outer reinforcing plate 25 is strip-shaped to improve the bending stiffness in the length direction, the front support 1 is prevented from being bent and deformed, and the bearing capacity of the structure is improved.

[0109] In the description of the present application, a large number of specific details are described. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the present description.

[0110] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present description, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present description and the features of the different embodiments or examples without contradiction.

[0111] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and description of the present application.

Claims

1. A heavy rear door hinge arrangement, characterized in that The utility model relates to a front support, including: A bottom plate is arranged at the upper rear side of the side plate of the container; Two vertical plates are arranged in parallel and are arranged on the top surface of the bottom plate; A rear support, including: An inner hanging plate is arranged on the outer surface of the door plate; An outer hanging plate is arranged on the side end surface of the door plate and is arranged in parallel and spaced apart from the inner hanging plate; A rear hanging plate is connected to the inner hanging plate and the outer hanging plate on both sides of the inner surface; An inner reinforcing plate is arranged on the side of the inner hanging plate away from the outer hanging plate; An outer reinforcing plate is arranged on the side of the outer hanging plate away from the inner hanging plate; A turnover seat is arranged in close contact between the two vertical plates on one end and is arranged in close contact between the inner hanging plate and the outer hanging plate on the other end; A hinge assembly I includes: A first nut; A first bolt, the screw rod penetrates the turnover seat and the two vertical plates and is threadedly connected with the first nut; A hinge assembly II includes: A second nut; A second bolt, the screw rod penetrates the inner reinforcing plate, the inner hanging plate, the turnover seat, the outer hanging plate and the outer reinforcing plate in sequence and is threadedly connected with the second nut. The front support includes:

2. A heavy duty rear door hinge arrangement according to claim 1, characterised in that, A first limiting block is arranged on the outer side of one of the vertical plates and is located above the first bolt and is in abutment with the head of the first bolt; A first protective cover is arranged on the outer side of the other vertical plate and is located above the first nut. The rear support includes:

3. The heavy duty rear door hinge arrangement according to claim 1, characterized in that A second limiting block is arranged on the outer side of the inner reinforcing plate and is located above the second bolt and is in abutment with the head of the second bolt; A second protective cover is arranged on the outer side of the outer reinforcing plate and is located above the second nut. The outer end surface of the first nut is provided with a plurality of first grooves arranged around the axis and penetrating radially, one end of the first bolt is provided with a first insertion hole penetrating radially, a first bolt is inserted into the first insertion hole, and both ends of the first bolt extend out of the first insertion hole and are respectively clamped in two first grooves.

4. The heavy duty rear door hinge arrangement of claim 1, wherein, The outer end surface of the second nut is provided with a plurality of second grooves arranged around the axis and penetrating radially, one end of the second bolt is provided with a second insertion hole penetrating radially, a second bolt is inserted into the second insertion hole, and both ends of the second bolt extend out of the second insertion hole and are respectively clamped in two second grooves.

5. The heavy duty rear door hinge apparatus according to claim 1, wherein, The bottom surface of one of the vertical plates is provided with an opening for discharging accumulated broken materials in the front support.

6. The heavy duty rear door hinge apparatus according to claim 1, wherein, The front support includes:

7. The heavy duty rear door hinge apparatus according to claim 1, wherein, A reinforcing plate is arranged between the vertical plates and is located on the side of the vertical plate away from the turnover seat. The reinforcing plate is arranged obliquely and the end close to the hinge assembly I is higher than the end away from the hinge assembly I.

8. A heavy rear door hinge arrangement according to claim 7, c h a r a c t e r i s e d in that The inner reinforcing plate is circular and the outer reinforcing plate is strip-shaped.

9. The heavy duty rear door hinge apparatus according to claim 1, wherein, ​

Images