A mechanical door opening prevention device

Abstract

The invention discloses a mechanical door opening prevention device, which comprises: a vehicle loading platform, a chain rod mechanism connected to the vehicle loading platform, the chain rod mechanism comprising a left rod body and a right rod body that are horizontally relatively parallel, a front rod body and a rear rod body that are horizontally relatively parallel, a first rod body and a second rod body that are longitudinally relatively parallel, and a third rod body and a fourth rod body that are longitudinally relatively parallel; a push rod is also hinged on the front rod body or the rear rod body, and when the push rod is pushed by an external force, the front rod body or the rear rod body is driven to rotate, and the left rod body and the right rod body are synchronously driven to rotate so that the left rod body and the right rod body are lowered or raised relative to the front rod body and the rear rod body. Compared with the prior art, it realizes in a purely mechanical manner that, in the process of the vehicle rising and falling with the vehicle loading platform, the push rod is acted on by an external force to keep the left rod body and the right rod body raised, thereby preventing the door from opening accidentally and avoiding safety accidents, and has a simple structure, low cost and good prevention effect.

Description

Technical Field

[0001] The present invention relates to the technical field of stereo garages, and in particular to a mechanical vehicle door opening prevention device. Background Art

[0002] Stereoscopic circulation garages are used to solve the problem of land shortage and parking difficulties in cities. For stereoscopic circulation garages, the vehicle loading platform needs to be raised and lowered cyclically. Therefore, if the door is suddenly opened during the vehicle lifting process, it will cause a collision between the vehicle and the garage and cause a safety accident. The main means of preventing such accidents is to design detection equipment to immediately stop the movement of the vehicle loading platform according to the detection signal. However, this method is costly and the preventive measures are delayed. It can only reduce accidents but not avoid them. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a mechanical door opening prevention device for solving the problem of safety accidents caused by the door opening when the vehicle loading platform of the existing three-dimensional circulation garage is raised or lowered.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A mechanical anti-car door opening device comprises: a vehicle loading platform, a chain rod mechanism connected to the vehicle loading platform, the vehicle loading platform comprises a bottom plate for carrying vehicles, two front connecting arms connected to both sides of the front end of the bottom plate, two rear connecting arms connected to both sides of the rear end of the bottom plate, a front cross arm connected to the two front connecting arms, a rear cross arm connected to the two rear connecting arms, and a cross beam connecting the front cross arms and the rear cross arms, the cross beam is connected to the lifting mechanism of a three-dimensional parking garage; wherein the chain rod mechanism is connected to the bottom plate, and when a vehicle enters the vehicle loading platform, the chain rod mechanism is actuated to place the side door limit within a safe range.

[0006] Wherein, the chain rod mechanism includes: a left rod body and a right rod body that are horizontally relatively parallel, a front rod body and a rear rod body that are horizontally relatively parallel, a first rod body and a second rod body that are longitudinally relatively parallel, and a third rod body and a fourth rod body that are longitudinally relatively parallel; the upper end of the first rod body is hinged to the front end of the left rod body through a first hinge, and the lower end is fixedly connected to the left end of the front rod body; the upper end of the third rod body is hinged to the rear end of the left rod body through the first hinge, and the lower end is fixedly connected to the left end of the rear rod body; the upper end of the second rod body is hinged to the front end of the left rod body through the first hinge, and the lower end is fixedly connected to the left end of the rear rod body; The front end of the right rod body and the lower end are fixedly connected to the right end of the front rod body, the upper end of the fourth rod body is hinged to the rear end of the right rod body through a first hinge, and the lower end is fixedly connected to the right end of the rear rod body; wherein, the front rod body and the rear rod body are both fixedly connected to the base plate, the left rod body and the right rod body are located on both sides of the relatively long sides of the base plate, and a push rod is also hinged on the front rod body or the rear rod body, and when the push rod is pushed by an external force, it drives the front rod body or the rear rod body to rotate, and synchronously drives the left rod body and the right rod body to rotate so that the left rod body and the right rod body are lowered or raised relative to the front rod body and the rear rod body.

[0007] Wherein, the first hinged component includes: an upper connecting plate, a lower connecting plate and a rotating shaft component; the upper connecting plate is provided with a first hinge hole, the lower connecting plate is provided with a second hinge hole corresponding to the first hinge hole, and the rotating shaft component is passed through the first hinge hole and the second hinge hole.

[0008] Among them, the push rod is hinged to the front rod body or the rear rod body through a second hinge, and the second hinge includes: a rotating plate fixedly connected to the front rod body or the rear rod body, and a connecting plate connected to the end of the push rod, the rotating plate is provided with a first circular hole, and the connecting plate is provided with a second circular hole, and a rotating shaft is passed through the first circular hole and the second circular hole.

[0009] Wherein, a rotation fulcrum assembly is disposed at the left end and the right end of the front rod body, and the rotation fulcrum assembly is also disposed at the left end and the right end of the rear rod body.

[0010] Wherein, the rotating fulcrum assembly includes: a sleeve, a connecting block connected to the sleeve, and a bearing arranged in the sleeve, and the front rod body and the rear rod body are both inserted into the bearing.

[0011] Among them, the rear end of the push rod is also hinged with a push rod assembly, which includes: a push rod, a spring sleeved on the outer wall of the push rod, and a roller rotatably connected to the rear end of the push rod. When the push rod is pushed to rotate, the push rod assembly only moves back and forth in the horizontal direction.

[0012] Among them, a limit plate is fixedly connected to the push rod, a limit rod is arranged on the limit plate, a support arm is arranged on the bottom plate, a through hole for the push rod to pass through and a guide hole for the limit rod to pass through are arranged on the support arm, the limit rod is passed through the guide hole, and the spring is located between the support arm and the roller.

[0013] It also includes a guide block, and one side of the guide block relative to the roller is arched. When the chain rod mechanism rises and falls with the vehicle carrier, the roller is squeezed by the guide block to drive the push rod to move so that the left rod body and the right rod body remain in a raised state.

[0014] Wherein, the front rod body, the rear rod body, the left rod body, the right rod body, the first rod body, the second rod body, the third rod body and the fourth rod body are all cylindrical rods or hollow circular tubes.

[0015] Compared with the prior art, the mechanical door-preventing device of the present invention realizes the raising or lowering of the left rod and the right rod through a simple hinged combination of multiple rods. The left rod and the right rod are respectively located on both sides of the length of the vehicle loading platform, that is, one side of the vehicle door. When the vehicle is raised or lowered with the vehicle loading platform, the push rod is acted upon by external force to keep the left rod and the right rod raised, thereby preventing the door from opening accidentally and avoiding safety accidents. In addition, the connecting mechanism has a simple structure, low cost and good prevention effect.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the mechanical door opening prevention device of the present invention.

[0018] Figure 2 This is a schematic structural diagram from another angle of the mechanical door opening prevention device of the present invention.

[0019] Figure 3 It is a partial structural schematic diagram of the chain rod mechanism of the mechanical door opening prevention device of the present invention.

[0020] Figure 4 for Figure 3 Schematic diagram of the partially enlarged structure of part A.

[0021] Figure 5 for Figure 3 Schematic diagram of the partially enlarged structure of part B.

[0022] Figure 6 for Figure 3Schematic diagram of the partially enlarged structure of part C in the middle.

[0023] Figure 7 for Figure 3 Schematic diagram of the partially enlarged structure of part D in the middle.

[0024] Figure 8 for Figure 2 Schematic diagram of the partially enlarged structure of part E in the middle. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0032] See also Figures 1 to 8 The present embodiment provides a mechanical door-preventing device, which comprises: a vehicle loading platform 200, a chain rod mechanism 100 connected to the vehicle loading platform 200, the vehicle loading platform 200 comprises a bottom plate 011 for carrying a vehicle, the bottom plate 011 is rectangular, two front connecting arms 012 connected to both sides of the front end of the bottom plate 011, two rear connecting arms 017 connected to both sides of the rear end of the bottom plate 011, a front cross arm 013 connected to the two front connecting arms 012, a rear cross arm 018 connected to the two rear connecting arms 017, and a cross beam 014 connecting the front cross arms 013 and the rear cross arms 018, the cross beam 014 is connected to the lifting mechanism of the stereo garage, specifically, the two ends of the cross beam 014 slide along the circulating track of the stereo garage respectively, thereby driving the lifting action of the entire vehicle loading platform 200. The chain rod mechanism 100 is connected to the bottom plate 011. When a vehicle enters the vehicle loading platform 200, the chain rod mechanism 100 is activated to place the side door limit in a safe range.

[0033] Please refer again Figure 3The chain rod mechanism 100 comprises: a left rod body 3 and a right rod body 4 which are horizontally relatively parallel, a front rod body 1 and a rear rod body 2 which are horizontally relatively parallel, a first rod body 5 and a second rod body 7 which are longitudinally relatively parallel, and a third rod body 6 and a fourth rod body 8 which are longitudinally relatively parallel. The front rod body 1, the rear rod body 2, the left rod body 3 and the right rod body 4 have a rectangular shape in their forward projection. The upper end of the first rod body 5 is hinged to the front end of the left rod body 3 through a first hinge A, and the lower end is fixedly connected to the left end of the front rod body 1. The upper end of the third rod body 6 is hinged to the rear end of the left rod body through the first hinge A, and the lower end is fixedly connected to the left end of the rear rod body 2. The upper end of the second rod body 7 is hinged to the front end of the right rod body 4 through the first hinge A, and the lower end is fixedly connected to the right end of the front rod body 1. The upper end of the fourth rod body 8 is hinged to the rear end of the right rod body 4 through the first hinge A, and the lower end is fixedly connected to the right end of the rear rod body 2. Wherein, a push rod 9 is also hinged on the front rod body 1 or the rear rod body 2. When the push rod 9 is pushed by an external force, the front rod body 1 or the rear rod body 2 is driven to rotate, and the left rod body 3 and the right rod body 4 are synchronously driven to rotate so that the left rod body 3 and the right rod body 4 are lowered or raised relative to the front rod body 1 and the rear rod body 2. The front rod body 1 and the rear rod body 2 are connected to the vehicle loading platform of the three-dimensional parking garage. When the left rod body 3 and the right rod body 4 are raised, the door side of the vehicle located on the vehicle loading platform can be blocked, thereby preventing safety accidents caused by the door suddenly opening. Wherein, the front rod body 1 and the rear rod body 2 are both fixedly connected to the bottom plate 011, and the left rod body 3 and the right rod body 4 are located on both sides of the relatively long side of the bottom plate 011. When the left rod body 3 and the right rod body 4 are raised, the left rod body 3 and the right rod body 4 are both higher than the upper surface of the bottom plate 011, so that it is appropriate to block the door of the vehicle.

[0034] Please refer again Figure 4 , the first hinged member A comprises: an upper connecting piece 31, a lower connecting piece 51 and a rotating shaft 32; the upper connecting piece 31 is provided with a first hinge hole, the lower connecting piece 51 is provided with a second hinge hole corresponding to the first hinge hole, and the rotating shaft 32 is passed through the first hinge hole and the second hinge hole so that the upper connecting piece 31 and the lower connecting piece 51 rotate along the rotating shaft 32. In this embodiment, the upper connecting piece 31 is fixedly connected to the left rod body 3, and the lower connecting piece 51 is fixedly connected to the upper end of the first rod body 5.

[0035] Please refer again Figure 6The push rod 9 is hinged to the front rod body 1 or the rear rod body 2 through a second hinge C, and the second hinge C includes: a rotating piece 21 fixedly connected to the front rod body 1 or the rear rod body 2, and a connecting piece 91 connected to the end of the push rod 9, the rotating piece 21 is provided with a first circular hole, and the connecting piece 91 is provided with a second circular hole, and the first circular hole and the second circular hole are penetrated with a rotating shaft 22 so that the rotating piece 21 and the connecting piece 91 rotate along the rotating shaft 22. In this embodiment, the push rod 9 is hinged to the middle part of the rear rod body 2, and the rotating shaft 22 can also be a bolt. The connecting piece 91 extends from the front end of the push rod 9, and can also be integrally formed.

[0036] Please refer again Figure 5 A rotation fulcrum assembly B is provided at the left and right ends of the front rod body 1, and the rotation fulcrum assembly B is also provided at the left and right ends of the rear rod body 2.

[0037] The rotating fulcrum assembly B includes: a sleeve 21, a connecting block 23 connected to the sleeve 21, and a bearing 22 arranged in the sleeve 21, and the front rod body 1 and the rear rod body 2 are both inserted into the bearing 22. Further, in order to facilitate assembly, a connecting and fixing block 61 is also provided between the lower end of the third rod body 6 and the rear rod body 2. The connecting block 23 is connected to the bottom plate 011 of the vehicle loading platform 200 of the three-dimensional parking garage, providing a rotating fulcrum for the rotation of the front rod body 1 and the rear rod body 2, so that the front rod body 1 and the rear rod body 2 can rotate along the rotating fulcrum assembly B.

[0038] Please refer again Figure 7 The rear end of the push rod 9 is also hinged with a push rod assembly D. When the push rod is pushed to rotate, the push rod assembly D only reciprocates in the horizontal direction, so that it can drive the front rod body 1 or the rear rod body 2 to rotate.

[0039] The push rod assembly D includes: a push rod 10, a spring 11 sleeved on the outer wall of the push rod 10, and a roller 12 rotatably connected to the rear end of the push rod 10. When the free end of the spring 11 is applied to the vehicle loading platform, it abuts against the limit part on the vehicle loading platform, so that the push rod 10 is compressed by the spring 11 and recovers when the external force is lost.

[0040] Please refer again Figure 8Further, the push rod 10 is also fixedly connected with a limit plate 13, and the limit plate 13 is provided with a limit rod 14. The bottom plate 011 is provided with a support arm 015, and the support arm 015 is provided with a through hole for the push rod 10 to pass through and a guide hole 016 for the limit rod 14 to pass through. The limit rod 14 is passed through the guide hole 016. Since the push rod 10 is fixedly connected with the limit plate 13, and the push rod 10 and the limit rod 14 are both passed through the through hole and the limit hole on the support arm 015, when the push rod 10 moves horizontally back and forth, it can be ensured that the push rod 10 itself will not rotate, thereby failing to drive the push rod. The spring 11 is located between the support arm 015 and the roller 12. Similarly, the rear end of the push rod 9 is provided with a connecting ear 93, and the front end of the push rod 10 is provided with a hinge piece 102 corresponding to the connecting ear 93, and the connecting ear 93 and the hinge piece 102 are connected by a bolt 92. A U-shaped clamping plate portion 101 extends from the rear end of the push rod 10, and the roller 12 is connected to the U-shaped clamping plate portion 101. When used in a vehicle-mounted platform, the roller 12 is affected by the external limiting component, thereby driving the push rod 9 to reciprocate in the horizontal direction.

[0041] Please refer again Figure 1 and Figure 8 The mechanical door opening prevention device further includes a guide block 02, one side of the guide block 02 relative to the roller is arched, specifically an isosceles triangle surface or a cylindrical surface. When the chain rod mechanism 100 is lifted and lowered along with the vehicle loading platform 200, the roller 12 is squeezed by the guide block 02, driving the top rod 10 to move so that the left rod body 3 and the right rod body 4 remain in the raised state. When the vehicle loading platform descends to the ground, the roller 12 separates from the guide block 02, and the left rod body 3 and the right rod body 4 descend, so that the vehicle can drive out of the vehicle loading platform.

[0042] In this embodiment, the front rod body 1, the rear rod body 2, the left rod body 3, the right rod body 4, the first rod body 5, the second rod body 7, the third rod body 6 and the fourth rod body 8 are all cylindrical rods.

[0043] In another embodiment, the front rod body 1, the rear rod body 2, the left rod body 3, the right rod body 4, the first rod body 5, the second rod body 7, the third rod body 6 and the fourth rod body 8 are all hollow circular tubes.

[0044] The movement process of the chain rod mechanism of this embodiment is as follows: when the top rod 10 is acted upon by an external force, it moves horizontally, pushing the push rod 9 to swing up and down, and at the same time driving the rear rod body 2 to rotate along the rotating fulcrum assembly B. When it rains, the left rod body 3 and the right rod body 4 are respectively hinged to the two ends of the rear rod body 2 through the third rod body 6 and the fourth rod body 8. Therefore, the left rod body 3 and the right rod body 4 will tilt forward and thus descend; otherwise, the left rod body 3 and the right rod body 4 will rise. The first rod body 5, the second rod body 7, the third rod body 6 and the fourth rod body 8 are all in a vertical state. At this time, the left rod body 3 and the right rod body 4 will restrict the vehicle door within the longitudinal space of the vehicle loading platform. Even if the door is suddenly opened, it will be blocked by the left rod body 3 and the right rod body 4, thereby avoiding the occurrence of a collision accident.

[0045] Compared with the prior art, the mechanical door-preventing device of the present embodiment realizes the raising or lowering of the left rod and the right rod through a simple hinged combination of multiple rods. The left rod and the right rod are respectively located on both sides of the length of the vehicle loading platform, that is, one side of the vehicle door. When the vehicle is raised or lowered along with the vehicle loading platform, the push rod is acted upon by external force to keep the left rod and the right rod raised, thereby preventing the door from opening accidentally and avoiding safety accidents. In addition, the connecting mechanism has a simple structure and adopts a purely mechanical structure, which is low in cost and has a good preventive effect.

[0046] The above examples are only used to further illustrate the technical content of the present invention, so that readers can understand it more easily, but they do not mean that the implementation of the present invention is limited to this. Any technical extension or re-creation made according to the present invention is protected by the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A mechanical door opening prevention device, characterized in that: include: A vehicle loading platform, a chain rod mechanism connected to the vehicle loading platform, the vehicle loading platform includes a bottom plate for carrying vehicles, two front connecting arms connected to both sides of the front end of the bottom plate, two rear connecting arms connected to both sides of the rear end of the bottom plate, a front cross arm connected to the two front connecting arms, a rear cross arm connected to the two rear connecting arms, and a cross beam connecting the front cross arms and the rear cross arms, the cross beam is connected to the lifting mechanism of the three-dimensional parking garage; wherein, the chain rod mechanism is connected to the bottom plate, when the vehicle enters the vehicle loading platform, the chain rod mechanism is actuated to place the vehicle side threshold in a safe range, the chain rod mechanism includes: a left rod body and a right rod body that are horizontally relatively parallel and distributed , a front rod and a rear rod that are horizontally and parallelly distributed relative to each other, a first rod and a second rod that are longitudinally and parallelly distributed relative to each other, and a third rod and a fourth rod that are longitudinally and parallelly distributed relative to each other; the upper end of the first rod is hinged to the front end of the left rod through a first hinge, and the lower end is fixedly connected to the left end of the front rod; the upper end of the third rod is hinged to the rear end of the left rod through the first hinge, and the lower end is fixedly connected to the left end of the rear rod; the upper end of the second rod is hinged to the front end of the right rod through the first hinge, and the lower end is fixedly connected to the right end of the front rod; the upper end of the fourth rod is hinged to the right rod through the first hinge The rear end of the rod body and the lower end are fixedly connected to the right end of the rear rod body; wherein the front rod body and the rear rod body are both fixedly connected to the bottom plate, the left rod body and the right rod body are located on both sides of the relatively long sides of the bottom plate, and the front rod body or the rear rod body is also hinged with a push rod, when the push rod is pushed by an external force, the front rod body or the rear rod body is driven to rotate, and the left rod body and the right rod body are synchronously driven to rotate so that the left rod body and the right rod body are lowered or raised relative to the front rod body and the rear rod body; the rear end of the push rod is also hinged with a push rod assembly, and the push rod assembly includes: a push rod, a spring sleeved on the outer wall of the push rod, and a roller rotatably connected to the rear end of the push rod, When the rod assembly pushes the push rod to rotate, it only moves back and forth in the horizontal direction. A limit plate is fixedly connected to the push rod, and a limit rod is arranged on the limit plate. A support arm is arranged on the bottom plate, and a through hole for the push rod to pass through and a guide hole for the limit rod to pass through are arranged on the support arm. The limit rod is passed through the guide hole. The spring is located between the support arm and the roller, and also includes a guide block. The guide block is arched on one side relative to the roller. When the chain rod mechanism rises and falls with the vehicle carrier, the roller is squeezed by the guide block, driving the push rod to move so that the left rod body and the right rod body remain in a raised state.

2. The mechanical door opening prevention device according to claim 1, characterized in that: The first hinged component includes: an upper connecting plate, a lower connecting plate and a rotating shaft component; the upper connecting plate is provided with a first hinge hole, the lower connecting plate is provided with a second hinge hole corresponding to the first hinge hole, and the rotating shaft component is passed through the first hinge hole and the second hinge hole.

3. The mechanical door opening prevention device according to claim 1, characterized in that: The push rod is hinged to the front rod body or the rear rod body through a second hinge, and the second hinge includes: a rotating plate fixedly connected to the front rod body or the rear rod body, and a connecting plate connected to the end of the push rod, the rotating plate is provided with a first circular hole, and the connecting plate is provided with a second circular hole, and a rotating shaft is passed through the first circular hole and the second circular hole.

4. The mechanical door opening prevention device according to claim 1, characterized in that: The left end and the right end of the front rod body are both provided with a rotation fulcrum assembly, and the left end and the right end of the rear rod body are also provided with the rotation fulcrum assembly.

5. The mechanical door opening prevention device according to claim 4, characterized in that: The rotating fulcrum assembly comprises: a shaft sleeve, a connecting block connected to the shaft sleeve, and a bearing arranged in the shaft sleeve, and the front rod body and the rear rod body are both penetrated by the bearing.

6. The mechanical door opening prevention device according to claim 1, characterized in that: The front rod body, the rear rod body, the left rod body, the right rod body, the first rod body, the second rod body, the third rod body and the fourth rod body are all cylindrical rods or hollow circular tubes.

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