Four-bar linkage door structure

Through the four-link door structure and elastic telescopic mechanism, the problem of large space occupied by the door structure in the prior art is solved, and the door is efficient, safely opened and convenient to operate, and is suitable for heavy-duty metal doors.

CN222140987UActive Publication Date: 2024-12-10SHINVA MEDICAL INSTR CO LTD
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Patent Information

Application Number
CN202323351056.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-09
Publication Date
2024-12-10
Estimated Expiration
2033-12-09

AI Technical Summary

Technical Problem

The engraving and milling machine door structure of the existing oral teaching evaluation equipment occupies a large lower space when opened, which is inconvenient to operate, and the metal door is heavy and laborious, which poses safety hazards.

Method used

The four-linked rod door structure is adopted, including the door main body, cavity support plate and connecting rod switch structure. The upper connecting rod, lower connecting rod and elastic telescopic mechanism are used to realize the parallelogram motion trajectory of the door, ensuring that the door main body is lifted and lowered at the same angle, and Improve the stability and operational convenience of the door through components such as gas springs and nylon blocks.

Benefits of technology

It realizes that the door does not occupy the lower space after opening, which is convenient for operation, and is suitable for heavier metal doors, ensuring the fit and safety of the door and avoiding the problem of turning out due to gravity.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of door body equipment, and particularly relates to a four-connecting-rod door structure which comprises a door body, a cavity supporting plate and connecting rod switch structures, the two sides of the door body and the two sides of the cavity supporting plate are each provided with one connecting rod switch structure, and each connecting rod switch structure comprises an upper connecting rod, a lower connecting rod and an elastic telescopic mechanism. The two ends of the upper connecting rod and the two ends of the lower connecting rod are hinged to the door body and the cavity supporting plate respectively, the door body, the cavity supporting plate, the upper connecting rod and the lower connecting rod form a parallelogram structure, and the end, close to the cavity supporting plate, of the upper connecting rod and / or the lower connecting rod is movably connected with one end of an elastic telescopic mechanism. The other end of the elastic telescopic mechanism is movably connected to the cavity supporting plate. By means of the dead point characteristic, after a dead point is crossed during door opening, the elastic telescopic mechanism directly jacks up the door body, after the elastic telescopic mechanism crosses the dead point during downward pressing, the elastic telescopic mechanism actively presses and closes the door body, the four-rod mechanism ensures that the door body ascends and descends at the same angle relative to the ground, and operation of workers is facilitated.
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Description

Technical Field

[0001] The utility model belongs to the technical field of door body equipment, and in particular relates to a four-link door structure. Background Art

[0002] At present, the door structure of many oral teaching and evaluation equipment adopts the structure of engraving and milling machine door. The structure uses the sliding door and the lower contact line of the front of the equipment as the axis to make a folding movement to realize the opening and closing of the door. When the door is opened, it occupies the lower space, which is not conducive to internal operations. In addition, the embedded design makes the door frame thick and takes up space. When clamping the internal materials of the equipment, both hands are needed to operate, so a wider and larger door opening area is required. At the same time, oral teaching and evaluation equipment uses a more solid metal door, which is heavy and laborious to open manually and has certain risks. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a four-link door structure, which does not occupy the lower space after the door is opened, and is convenient for staff to operate.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a four-link door structure, including a door body, a cavity support plate and a link switch structure, the link switch structure is arranged between the door body and the cavity support plate, and a group of link switch structures are arranged on both sides of the door body and the cavity support plate;

[0005] The connecting rod switch structure includes an upper connecting rod, a lower connecting rod and an elastic telescopic mechanism, both ends of the upper connecting rod and the lower connecting rod are respectively hinged to the door body and the cavity support plate, the door body, the cavity support plate, the upper connecting rod and the lower connecting rod form a parallelogram structure, one end of the upper connecting rod and / or the lower connecting rod close to the cavity support plate is movably connected to one end of the elastic telescopic mechanism, and the other end of the elastic telescopic mechanism is movably connected to the cavity support plate.

[0006] Preferably, the elastic expansion and contraction mechanism is a gas spring, one end of the gas spring is connected to one end of the upper connecting rod close to the cavity support plate, and the other end of the gas spring is rotatably connected to the cavity support plate.

[0007] Preferably, the upper connecting rod and the lower connecting rod are both connected to the lower part of the door body, a connecting block is fixedly provided on the inner side of the lower part of the door body, and the upper connecting rod and the lower connecting rod are both hinged on the connecting block.

[0008] Preferably, an anti-collision damper is fixedly provided on a side of the upper connecting rod close to the lower connecting rod, or an anti-collision damper is fixedly provided on a side of the lower connecting rod close to the upper connecting rod.

[0009] Preferably, nylon blocks are fixedly provided on one side of the upper connecting rod and the lower connecting rod close to the cavity support plate.

[0010] Preferably, a silicone strip is fixedly provided on one side edge of the door body close to the cavity support plate.

[0011] Preferably, both ends of the upper connecting rod and the lower connecting rod are provided with nylon bearings.

[0012] Preferably, shaft sleeves are provided on the door body and the cavity support plate, and hinge holes sleeved on the outside of the shaft sleeves are provided at both ends of the upper connecting rod and the lower connecting rod. The nylon bearing is L-shaped, and two nylon bearings are symmetrically arranged on both sides of the hinge hole. A shoulder is provided at one end of the shaft sleeve and a retaining ring is provided at the other end. The retaining ring is fixedly connected to the shaft sleeve by bolts.

[0013] Preferably, the door body is arranged at an angle, and the upper end of the door body is inclined toward a side close to the cavity support plate.

[0014] Compared with the prior art, the above technical solution has the following beneficial effects:

[0015] 1. The connecting rod switch structure of the utility model can withstand high strength and is stronger. The four-bar linkage ensures that the door body fits better with the equipment. At the same time, the motion trajectory of the door body is controlled by the principle of a plane-parallel four-bar linkage, ensuring that the door body is lifted and lowered at the same angle relative to the ground. The structure is suitable for equipment that uses heavier metal doors instead of plastic doors. The up and down lifting and pressing door opening and closing method has a small motion trajectory and does not occupy a large space. After the door is opened, it does not occupy the lower space, which is convenient for staff to operate. The utility model is provided with an elastic telescopic mechanism to connect the four-bar linkage, and utilizes the dead point characteristics of mechanics and the thrust of the elastic telescopic mechanism to achieve the effect that after the dead point is passed when the door is opened, the elastic telescopic mechanism directly lifts the door body and keeps it at the highest point, and after the dead point is passed when pressing down, the elastic telescopic mechanism will actively press and close the door body.

[0016] 2. The door body is set at a certain inclination angle so that the door body will not be turned outward and fit unevenly due to gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model in the closed state.

[0018] Figure 2 It is a structural schematic diagram of the utility model in the door opening state.

[0019] Figure 3 This is a cross-sectional view of the lower hinge.

[0020] Figure 4 It is a structural schematic diagram of the utility model at a dead point position.

[0021] Among them: 1. door body 2, connecting block 3, upper connecting rod 4, lower connecting rod 5, cavity support plate 6, cushion block 7, gas spring 8, anti-collision damping 9, retaining ring 10, nylon bearing 11, bushing 12, silicone strip 13, nylon block 14, connecting part 15, universal joint. DETAILED DESCRIPTION

[0022] Figures 1 to 4 It is the best embodiment of the utility model, and the following Figures 1 to 4 The utility model is further described.

[0023] like Figure 1 As shown, a four-link door structure of the utility model includes a door body 1, a cavity support plate 5 and a link switch structure. The cavity support plate 5 is arranged inside the equipment cavity. When the door body 1 is closed, it fits with the equipment door frame. The figure shows the door body 1 and the cavity support plate 5. The link switch structure is arranged between the door body 1 and the cavity support plate 5. A group of link switch structures are arranged on both sides of the door body 1 and the cavity support plate 5. The link switch structure includes an upper link 3, a lower link 4 and an elastic telescopic mechanism. Both ends of the upper link 3 and the lower link 4 are respectively hinged with the door body 1 and the cavity support plate 5. The hinge points of the upper connecting rod 3 and the lower connecting rod 4 with the cavity support plate 5 are set higher than the hinge points with the door body 1. The door body 1, the cavity support plate 5, the upper connecting rod 3 and the lower connecting rod 4 form a four-link parallelogram structure. One end of the upper connecting rod 3 and / or the lower connecting rod 4 close to the cavity support plate 5 is movably connected to one end of the elastic telescopic mechanism, and the other end of the elastic telescopic mechanism is movably connected to the cavity support plate 5. The motion trajectory of the door body 1 is controlled by the principle of a plane parallel four-bar mechanism, which ensures that the door body 1 is raised and lowered at the same angle relative to the ground, ensuring that the switch of the door body 1 is tightly closed.

[0024] like Figure 2 As shown, the upper connecting rod 3 and the lower connecting rod 4 are both connected to the lower part of the door body 1. When the door body 1 rises and opens, the lower operating space occupied by the door body 1 is very small, providing a larger operating space for the operator, making it more convenient for the operator to operate. Specifically, a connecting block 2 is fixedly provided on the inner side of the lower part of the door body 1, and the upper connecting rod 3 and the lower connecting rod 4 are both hinged on the connecting block 2, and the other ends of the upper connecting rod 3 and the lower connecting rod 4 are hinged on the cavity support plate 5.

[0025] In the present embodiment, the elastic expansion and contraction mechanism is a gas spring 7, one end of the gas spring 7 is connected to one end of the upper connecting rod 3 close to the cavity support plate 5, and the other end of the gas spring 7 is rotatably connected to the cavity support plate 5. Specifically, one end of the upper connecting rod 3 close to the cavity support plate 5 is connected to the gas spring 7, a connecting portion 14 is provided on the side of the upper connecting rod 3 close to the cavity support plate 5, the gas spring 7 is connected to the connecting portion 14, the gas spring 7 is connected to the side of the hinge point of the upper connecting rod 3 away from the door body 1, a universal joint 15 is provided at the end of the gas spring 7, the gas spring 7 is movably connected to the connecting portion 14 of the upper connecting rod 3 through the universal joint 15 at the end, the other end of the gas spring 7 is movably connected to the cavity support plate 5, a cushion block 6 is provided between the gas spring 7 and the cavity support plate 5, in the present embodiment, when the door body 1 is in a closed state, the gas spring 7 is tilted, and the end of the gas spring 7 connected to the upper connecting rod 3 is at a higher position. In other embodiments, the gas spring 7 may be connected to the lower connecting rod 4 , or one gas spring 7 may be connected to each of the upper connecting rod 3 and the lower connecting rod 4 .

[0026] When the door body 1 is raised or lowered, in order to ensure the stability of the door body 1 during the lifting process, nylon blocks 13 are fixedly arranged on one side of the upper connecting rod 3 and the lower connecting rod 4 close to the cavity support plate 5. The nylon blocks 13 are connected to the upper connecting rod 3 and the lower connecting rod 4 by bolts. The nylon blocks 13 are stuck between the upper connecting rod 3 and the cavity support plate 5 and between the lower connecting rod 4 and the cavity support plate 5. When the door body 1 is raised or lowered, the nylon blocks 13 can make the upper connecting rod 3 and the lower connecting rod 4 no longer suspended in the air, and the stability is stronger.

[0027] In order to prevent the door body 1 from colliding with the equipment due to the large inertia when closing and opening to the maximum, a silicone strip 12 is fixedly set on the edge of one side of the door body 1 close to the cavity support plate 5, and the silicone strip 12 plays a buffering role. The silicone strip 12 can also be set on the outer frame of the equipment, which can also play a buffering role. In order to prevent the door body 1 from contacting other parts due to the large inertia when opening to the maximum, an anti-collision damper 8 is fixedly set on the side of the upper connecting rod 3 close to the lower connecting rod 4, or an anti-collision damper 8 is fixedly set on the side of the lower connecting rod 4 close to the upper connecting rod 3. The anti-collision damper 8 is made of rubber. When the door body 1 reaches the highest point, the anti-collision damper 8 will contact the lower connecting rod 4 in advance to prevent the door body 1 from continuing to rise.

[0028] like Figure 3The figure shows a schematic diagram of the hinge of the upper connecting rod 3 and the lower connecting rod 4. In order to reduce friction and achieve smooth movement, nylon bearings 10 are provided at both ends of the upper connecting rod 3 and the lower connecting rod 4. Hinge holes are provided at the ends of the upper connecting rod 3 and the lower connecting rod 4. The nylon bearing 10 is L-shaped. Two nylon bearings 10 are symmetrically arranged on both sides of the hinge hole. A shaft sleeve 11 is provided on the cavity support plate 5 at each hinge point. A shaft shoulder is provided at one end of the shaft sleeve 11, and a retaining ring 9 is provided at the other end. The retaining ring 9 is fixedly connected to the shaft sleeve 11 by bolts. The bolts press the stainless steel retaining ring 9 to press the shaft sleeve 10 against the connecting block 2 and the main support plate 5.

[0029] like Figure 4 As described, there is a dead point position in the process of the door body lifting and opening or descending and closing. The dead point position is when the transmission angle on the follower is equal to zero, and the effective rotation torque of the driving force on the follower is zero. This position is called the dead point position of the mechanism, that is, the position where the follower and the connecting rod in the mechanism are collinear is called the dead point position of the mechanism. When the dead point position as shown in the figure, that is, the hinge point of the upper connecting rod 3 and the cavity support plate 5 and the two end positions of the gas spring 7 are in the same straight line, the thrust of the gas spring 7 has a mechanical dead point in the process of the door body 1 being pulled up. When the dead point is exceeded, the gas spring 7 can actively pull the door body 1 to the highest point and remain unchanged. When pressed down, the thrust exceeds the dead point, and the gas spring 7 will press the door body 1. In this embodiment, the door body 1 reaches the dead point position when a small part is opened.

[0030] In this embodiment, the door body 1 is a metal door, and the door body 1 is tilted, and the upper end of the door body 1 is tilted toward the side close to the cavity support plate 5. The door body 1 is set at a certain tilt angle so that the door body 1 will not be turned outward and unevenly fitted due to gravity. The door body 1, the connecting block 2, the upper connecting rod 3, the lower connecting rod 4 and the cavity support plate 5 in this embodiment are all made of aluminum alloy. This embodiment is suitable for smaller equipment. If used in large equipment, the aluminum alloy parts can be replaced with steel, and the gas spring 7 can be replaced with a hydraulic spring or other thrust spring.

[0031] When the utility model is in use, the staff pulls the door body 1 upward, and the upper connecting rod 3 and the lower connecting rod 4 rotate around the hinge point, so that the gas spring 7 is extended first. After the thrust of the gas spring 7 exceeds the dead point, it is directly lifted by the gas spring 7 and maintained at the highest point. During the lifting process, the motion trajectory of the door body 1 is controlled by the principle of the plane parallel four-bar linkage mechanism to ensure that the door body 1 is lifted and lowered at the same angle relative to the ground; when the door body 1 is pulled down to close, the thrust exceeds the dead point, and the gas spring 7 will actively press and close the door body 1. The utility model can be applied to equipment that uses heavier metal doors instead of plastic doors. The door opening and closing method of lifting and pressing up and down has a small motion trajectory and does not occupy a large space. After the door body 1 is opened, it does not occupy the lower space, which is convenient for staff to operate.

[0032] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A four-link door structure, characterized in that: It comprises a door body (1), a cavity support plate (5) and a connecting rod switch structure, wherein the connecting rod switch structure is arranged between the door body (1) and the cavity support plate (5), and a group of connecting rod switch structures are arranged on both sides of the door body (1) and the cavity support plate (5); The connecting rod switch structure comprises an upper connecting rod (3), a lower connecting rod (4) and an elastic telescopic mechanism, wherein both ends of the upper connecting rod (3) and the lower connecting rod (4) are respectively hinged to the door body (1) and the cavity support plate (5), and the door body (1), the cavity support plate (5), the upper connecting rod (3) and the lower connecting rod (4) form a parallelogram structure, and one end of the upper connecting rod (3) and / or the lower connecting rod (4) close to the cavity support plate (5) is movably connected to one end of the elastic telescopic mechanism, and the other end of the elastic telescopic mechanism is movably connected to the cavity support plate (5).

2. A four-link door structure according to claim 1, characterized in that: The elastic expansion and contraction mechanism is a gas spring (7), one end of the gas spring (7) is connected to one end of the upper connecting rod (3) close to the cavity support plate (5), and the other end of the gas spring (7) is rotatably connected to the cavity support plate (5).

3. A four-link door structure according to claim 1, characterized in that: The upper connecting rod (3) and the lower connecting rod (4) are both connected to the lower part of the door body (1); a connecting block (2) is fixedly arranged on the inner side of the lower part of the door body (1); and the upper connecting rod (3) and the lower connecting rod (4) are both hinged on the connecting block (2).

4. A four-link door structure according to claim 1, characterized in that: An anti-collision damper (8) is fixedly provided on a side of the upper connecting rod (3) close to the lower connecting rod (4), or an anti-collision damper (8) is fixedly provided on a side of the lower connecting rod (4) close to the upper connecting rod (3).

5. The four-link door structure according to claim 1, characterized in that: A nylon block (13) is fixedly provided on one side of the upper connecting rod (3) and the lower connecting rod (4) close to the cavity support plate (5).

6. A four-link door structure according to claim 1, characterized in that: A silicone strip (12) is fixedly arranged on one side edge of the door body (1) close to the cavity support plate (5).

7. The four-link door structure according to claim 1, characterized in that: Both ends of the upper connecting rod (3) and the lower connecting rod (4) are provided with nylon bearings (10).

8. A four-link door structure according to claim 7, characterized in that: A shaft sleeve (11) is provided on the door body (1) and the cavity support plate (5), and hinge holes are provided at both ends of the upper connecting rod (3) and the lower connecting rod (4) and are sleeved on the outside of the shaft sleeve (11). The nylon bearing (10) is L-shaped, and the two nylon bearings (10) are symmetrically arranged on both sides of the hinge hole. A shaft shoulder is provided at one end of the shaft sleeve (11), and a retaining ring (9) is provided at the other end. The retaining ring (9) is fixedly connected to the shaft sleeve (11) by bolts.

9. The four-link door structure according to claim 1, characterized in that: The door body (1) is arranged tilted, with the upper end of the door body (1) tilted towards a side close to the cavity support plate (5).