Access door opening and closing mechanism for discharge hopper

Abstract

The utility model relates to the technical field of feed machinery, in particular to an access door opening and closing mechanism for a discharge hopper, which comprises an access door mounted on the discharge hopper, the access door is inclined inwards from top to bottom, the upper end of the access door is hinged to the discharge hopper, a gas spring is hinged to the discharge hopper, and a supporting rod of the gas spring is hinged to the access door. The hinged point of the gas spring and the discharge hopper is located below the hinged point of the supporting rod and the access door. When the gas spring supporting rod opening and closing device is installed on the discharge hopper, the situation that due to the dead weight of a door plate, the door plate triggers the gas spring supporting rod to be opened spontaneously, and danger is caused is avoided. When the door plate is in a closed state, the self-locking function is completed through the supporting force of the gas spring, the installation hidden danger caused by accidental opening of the discharging door can be effectively eliminated, and the whole opening and closing mechanism is high in structural reliability and convenient to implement.

Description

Technical Field

[0001] The utility model relates to the technical field of feed machinery, in particular to an opening and closing mechanism for a maintenance door of a discharge hopper. Background Art

[0002] In feed machinery, an inverted conical discharge hopper is usually equipped with a maintenance door for daily maintenance and cleaning. Due to the large self-weight of the maintenance door, a gas spring strut is generally used to complete the opening and closing actions of the maintenance door. For the opening and closing actions of the maintenance door, it is first necessary to gently pull the maintenance door handle to provide an opening traction force. After the traction action, the gas spring strut ejects the maintenance door under the drive of the internal air pressure. Since the gas spring strut is installed on the inverted conical surface of the discharge hopper and the hinge position of the maintenance door is located above, under the action of its own gravity, the gravity acts as the traction force when the maintenance door is opened, which will cause the maintenance door to "automatically" open, posing a safety hazard. Summary of the Utility Model

[0003] In order to solve the problem that the maintenance door is prone to open under the gravity traction in the prior art, the utility model provides an opening and closing mechanism for a maintenance door of a discharge hopper, which can prevent the door panel from being spontaneously opened by triggering the gas spring strut due to the self-weight of the door panel, thus causing danger.

[0004] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0005] An opening and closing mechanism for a maintenance door of a discharge hopper includes a maintenance door installed on the discharge hopper. The maintenance door is inclined inward from top to bottom. The upper end of the maintenance door is hinged to the discharge hopper. A gas spring is hinged to the discharge hopper. The strut of the gas spring is hinged to the maintenance door. The hinge point of the gas spring and the discharge hopper is located below the hinge point of the strut and the maintenance door.

[0006] Further, a hinge seat is fixed to the discharge hopper and extends outward, so that the hinge point of the gas spring and the hinge seat is located below the hinge point of the strut and the maintenance door.

[0007] Further, the supporting moment provided by the gas spring is greater than the gravity moment of the self-weight of the maintenance door.

[0008] Further, the shape of the discharge hopper is inverted conical, and the maintenance door in the closed state is parallel to the conical side wall of the discharge hopper.

[0009] Further, when the maintenance door is in the fully open state, the axis of the gas spring is parallel to the conical side wall of the discharge hopper. The unilateral inclination angle of the discharge hopper is known, which is convenient for mechanical inspection and calculation.

[0010] Further, when the maintenance door is in the fully open state, the maintenance door is in a horizontal state. This is convenient for mechanical analysis to check whether the supporting force of the strut of the gas spring meets the requirements.

[0011] Beneficial effects: The utility model solves the problem that when an air spring strut opening and closing device is installed on a discharge hopper, due to the self-weight of the door panel, the door panel triggers the air spring strut to open spontaneously, causing danger. When the door panel is in the closed state, the "self-locking" function is completed through the supporting force of the air spring, which can effectively eliminate the installation hidden danger caused by the accidental opening of the discharge door, and the whole opening and closing mechanism has high structural reliability and is easy to implement. Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0013] Figure 1 Schematic three-dimensional structure diagram of the inspection door of the discharge hopper in the prior art;

[0014] Figure 2 Schematic side view structure diagram of the inspection door of the discharge hopper in the prior art;

[0015] Figure 3 Schematic three-dimensional structure diagram of the inspection door of the discharge hopper of the present utility model;

[0016] Figure 4 Schematic side view structure diagram of the inspection door of the discharge hopper of the present utility model;

[0017] Figure 5 Schematic diagram of the force principle when the inspection door is in the closed state;

[0018] Figure 6 Schematic diagram of the force principle when the inspection door is in the open state;

[0019] Figure 7 Schematic diagram of the force condition of the inspection door in the open state in Embodiment 1 of the present utility model;

[0020] Figure 8 Schematic diagram of the force condition of the inspection door in the closed state in Embodiment 1 of the present utility model.

[0021] 1. Discharge hopper, 2. Inspection door, 21. Handle, 3. Air spring, 31. Strut, 4. Hinge seat. Detailed Embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal", and "top, bottom" are usually based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0026] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figures and other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations during use or operation in addition to the orientation depicted in the figures for the device. For example, if the device in the attached drawing is inverted, a device described as "above or over other devices or structures" will then be positioned "below or under other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0027] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0028] Figure 1 is a schematic diagram of a conventional maintenance door opening and closing mechanism on the market. Due to the inverted cone shape of the discharge hopper, this conventional structure will rotate to the vertical position along the hinge seat fulcrum under the influence of the self - weight of the maintenance door, as shown by the dotted line position in Figure 2 This will cause the gas spring strut to be accidentally triggered, thus quickly pushing out the maintenance door and posing a safety risk.

[0029] In the present utility model, the position of the hinge seat 4 is redesigned. When the maintenance door 2 is in the closed state, the gas spring 3 connected to the hinge seat 4 can provide a supporting force along the direction of the strut 31, pressing the maintenance door 2 tightly against the installation inclined plane to prevent the "accidental opening" of the maintenance door under the action of its own weight. Specifically, as shown in Figures 3 - 4 , a maintenance door opening and closing mechanism for a discharge hopper of the utility model includes a maintenance door 2 installed on the discharge hopper 1. The maintenance door 2 is inclined inward from top to bottom. The upper end of the maintenance door 2 is hinged to the discharge hopper 1. A gas spring 3 is hinged to the discharge hopper 1. The strut 31 of the gas spring 3 is hinged to the maintenance door 2. The hinge point of the gas spring 3 and the discharge hopper 1 is located below the hinge point of the strut 31 and the maintenance door 2.

[0030] The discharge hopper 1 is fixed with a hinge seat 4. The hinge seat 4 extends outward, so that the hinge point of the gas spring 3 and the hinge seat 4 is located below the hinge point of the strut 31 and the maintenance door 2.

[0031] As shown in Figure 5 and Figure 6, compared with the conventional structures on the market, the support rod 31 of the gas spring 3 in the present utility model can provide sufficient supporting force for the inspection door 2 when the inspection door 2 is in the closed state, which can effectively prevent accidental opening and avoid safety accidents. Only by pulling the handle 21 of the inspection door 2 can the inspection door 2 be opened. Specifically, when the inspection door 2 is in the closed state, the supporting moment provided by the gas spring 3 is greater than the gravitational moment of the self-weight of the inspection door 2. The shape of the discharge hopper 1 is an inverted cone, and the inspection door 2 in the closed state is parallel to the conical side wall of the discharge hopper 1. When the inspection door 2 is in the fully open state, the axis of the gas spring 3 is parallel to the conical side wall of the discharge hopper 1. When the inspection door 2 is in the fully open state, the inspection door 2 is in a horizontal state. When the inspection door 2 is in the closed state, the hinge point of the inspection door 2 and the support rod 31 is closer to the discharge hopper 1 than the connection line between the hinge point of the inspection door 2 and the discharge hopper 1 and the hinge point of the gas spring 3 and the discharge hopper 1. During the opening process of the inspection door 2, the support rod 31 of the gas spring 3 first retracts and then extends.

[0032] Embodiment 1:

[0033] In this embodiment, the distance between the support rod 31 of the gas spring 3 and the hinge point of the inspection door 2 is L / 8, where L is the length of the inspection door 2. Figure 7 and Figure 8 shows the simplified force conditions of two states of the inspection door. As Figure 7 , when in the open state, the inspection door is in a static state at this time, and the two moments formed by the self-weight of the inspection door 2 and the supporting force provided by the support rod 31 of the gas spring 3 are balanced:

[0034] G×(L / 2)-2×F×(L / 8)×cosα=0

[0035]

[0036] Taking η (selection coefficient) as 1.2, the actual supporting force provided by the support rod 31 of the gas spring 3:

[0037]

[0038] As Figure 8 , when the inspection door is in the closed state, to prevent the inspection door 2 from falling spontaneously under the influence of its own weight, the supporting moment M F provided by the support rods 31 of the gas springs 3 on both sides needs to be G greater than the gravitational moment M

[0039]

[0040] M G =G×L G =G×(L / 2)×sinα≈0.25GL

[0041] M F >M G

[0042] Meet the condition of being closed and not sagging, so this mechanism meets the design requirements.

[0043] The above is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. An opening and closing mechanism for an inspection door of a discharge hopper, characterized in that: The invention comprises an inspection door (2) installed on a discharge hopper (1), the inspection door (2) being arranged to be tilted inward from top to bottom, the upper end of the inspection door (2) being hinged on the discharge hopper (1), a gas spring (3) being hinged on the discharge hopper (1), a support rod (31) of the gas spring (3) being hinged on the inspection door (2), and a hinge point between the gas spring (3) and the discharge hopper (1) being located below a hinge point between the support rod (31) and the inspection door (2).

2. The opening and closing mechanism for the inspection door of the discharge hopper according to claim 1, characterized in that: The unloading hopper (1) is fixed with a hinge seat (4), which extends outward so that the hinge point between the gas spring (3) and the hinge seat (4) is located below the hinge point between the support rod (31) and the inspection door (2).

3. The opening and closing mechanism for the inspection door of a discharge hopper according to claim 1, characterized in that: When the inspection door (2) is in a closed state, the supporting torque provided by the gas spring (3) is greater than the gravity torque of the inspection door (2) itself.

4. The opening and closing mechanism for the inspection door of the discharge hopper according to claim 3 is characterized in that: The discharge hopper (1) is in the shape of an inverted cone, and the inspection door (2) in a closed state is parallel to the conical side wall of the discharge hopper (1).

5. The opening and closing mechanism for the inspection door of the discharge hopper according to claim 4, characterized in that: When the inspection door (2) is in a fully opened state, the axial direction of the gas spring (3) is parallel to the conical side wall of the discharge hopper (1).

6. The opening and closing mechanism for the inspection door of the discharge hopper according to claim 5, characterized in that: When the inspection door (2) is in a fully opened state, the inspection door (2) is in a horizontal state.

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