Lock opening door knife for dumb waiter

Abstract

The utility model relates to the technical field of dumb waiters, in particular to an unlocking door knife for a dumb waiter. An unlocking door knife of a dumb waiter comprises an unlocking door knife body, and the unlocking door knife body comprises a door knife movable plate and a door knife main plate which are arranged up and down. A movable front arm and a movable rear arm are arranged on the lower side of the door vane movable plate, the movable front arm is arranged on the front side of the movable rear arm, and an electric push rod is installed on the door vane main plate. The door vane is simple in structure and convenient to use, noise generated during running and door opening of the dumb waiter can be avoided through cooperative work of the door vane movable plate, the door vane main plate, the movable front arm, the movable rear arm, the electric push rod and other components, and therefore the using effect of the dumb waiter is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cargo elevators, and particularly relates to a door unlocking knife for a cargo elevator. Background Art

[0002] At present, the elevators seen on the market are divided into two types. The first type is a large elevator for carrying people and goods, and the second type is a small utility elevator with a carrying capacity of less than 300KG. It can carry sundries and can also be used to deliver food in restaurants, so it is widely used in restaurants and schools. For example, in schools, meals are directly delivered to each floor through a utility elevator, which avoids the phenomenon of students crowding downstairs and queuing in the canteen during meal time. However, the most commonly used small utility elevators are fixed-height unlocking door knives. The function of the unlocking door knife is to hit the movable lock hook of the door lock with the fixed-height door knife after reaching the designated floor, so that the hall door is free from the restriction of the lock hook, and the hall door can be opened, as shown in the attached figure of the specification. Figure 1 and Figure 2 As shown in the figure, since the fixed height unlocking door knife is to hit the movable lock hook of the door lock, it will inevitably produce a collision sound, which will cause noise impact; there are also a few miscellaneous elevators that use electromagnets instead of collision unlocking door knives, as shown in the figure of the instruction manual Figure 3 As shown, although the noise caused by collision is solved and there is no collision sound when passing through the floors, when the service elevator reaches the designated floor and opens the door, it will also generate a large noise due to the rapid attraction movement of the electromagnet, thus affecting the user experience of the service elevator. Utility Model Content

[0003] The utility model aims to provide a door unlocking knife for a goods elevator to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] A door unlocking knife for a goods elevator, comprising a door unlocking knife body, characterized in that the door unlocking knife body comprises a door knife movable plate and a door knife main plate arranged in an upper and lower manner;

[0006] A movable front arm and a movable rear arm are provided at the lower side of the door knife movable plate, the movable front arm is arranged at the front side of the movable rear arm, the upper and lower parts of the movable front arm are rotatably connected with the door knife movable plate and the door knife main board respectively, and the upper and lower parts of the movable rear arm are rotatably connected with the door knife movable plate and the door knife main board respectively;

[0007] An electric push rod is installed on the door knife main board, and the lower part of the movable forearm is connected to a connecting piece arranged obliquely. The connecting piece is provided with a first through hole in the shape of an elongated strip, and a first pin shaft passes through the through hole, and the first pin shaft passes through a first pin shaft hole located at the front part of the electric push rod.

[0008] Furthermore, the movable forearm and the connecting piece adopt an integrated structure.

[0009] Furthermore, the first pin shaft is a pin shaft with a groove.

[0010] Furthermore, the left and right sides of the door knife main board are provided with second flanges extending upwards, the second flanges are provided with second through holes in the form of long strips, and the first pin shaft passes through the second through holes.

[0011] Furthermore, a fixing bracket is provided on the door knife main board, and the rear part of the electric push rod is connected to the fixing bracket through a first bolt.

[0012] Furthermore, the front and rear sides of the door knife movable plate are provided with a downwardly inclined bending portion.

[0013] The beneficial effects of the utility model are: providing a door knife for unlocking a goods elevator, which has a simple structure and is easy to use; through the coordinated work of components such as a door knife movable plate, a door knife main board, a movable front arm, a movable rear arm and an electric push rod, the goods elevator can be prevented from generating noise when running and opening the door, thereby improving the use effect of the goods elevator.

[0014] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram showing the use status of a door knife of fixed height is shown;

[0017] Figure 2 A partial structural schematic diagram of a door knife with a fixed height is shown;

[0018] Figure 3A schematic diagram showing the use status of a door knife using an electromagnet is shown;

[0019] Figure 4 A partial structural schematic diagram of the utility model when it is not in operation is shown;

[0020] Figure 5 A partial structural schematic diagram of the utility model in working state is shown;

[0021] Figure 6 A partial structural decomposition schematic diagram of the utility model is shown.

[0022] In the figure: 1. door knife movable plate; 2. door knife main board; 3. movable front arm; 4. movable rear arm; 5. electric push rod; 6. first through hole; 7. first pin shaft; 8. second through hole; 9. fixed bracket. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 4-6 As shown, a cargo elevator unlocking door knife comprises an unlocking door knife body, the unlocking door knife body comprises a door knife movable plate 1 and a door knife main board 2 arranged in upper and lower positions; a movable front arm 3 and a movable rear arm 4 are provided on the lower side of the door knife movable plate 1, the movable front arm 3 is arranged on the front side of the movable rear arm 4, the upper and lower parts of the movable front arm 3 are rotatably connected with the door knife movable plate 1 and the door knife main board 2 respectively, and the upper and lower parts of the movable rear arm 4 are rotatably connected with the door knife movable plate 1 and the door knife main board 2 respectively; an electric push rod 5 is installed on the door knife main board 2, the lower part of the movable front arm 3 is connected with an inclined connecting piece, the connecting piece is provided with a first through hole 6 in the shape of an elongated strip, a first pin shaft 7 passes through the through hole, and the first pin shaft 7 passes through the first pin shaft 7 hole located at the front part of the electric push rod 5. This design has a simple structure and is easy to use. Through the cooperation of the door knife movable plate 1, the door knife main board 2, the movable front arm 3, the movable rear arm 4 and the electric push rod 5, the noise generated during the operation and door opening of the service elevator can be avoided, thereby improving the use effect of the service elevator.

[0025] The movable forearm 3 and the connecting piece adopt an integrated structure to ensure the structural strength between the movable forearm 3 and the connecting piece.

[0026] The first pin shaft 7 is a pin shaft with a groove, and a slot is provided on the shaft body of the pin shaft with a slot, and a retaining ring for limiting the pin shaft is clamped in the slot, so as to facilitate fixing the first pin shaft 7.

[0027] The left and right sides of the door knife movable plate 1 are provided with a first flange extending downward, and the left and right sides of the door knife main plate 2 are provided with a second flange extending upward; the front side of the first flange, the rear side of the first flange, the front side of the second flange and the rear side of the second flange are provided with a second pin hole; the upper part of the movable front arm 3, the lower part of the movable front arm 3, the upper part of the movable rear arm 4 and the lower part of the movable rear arm 4 are provided with a third pin hole; the upper part of the movable front arm 3 is connected to the first flange by passing the second pin hole, the third pin hole and the third pin hole of the upper part of the movable front arm 3 The front side of the movable front arm 3 is connected to the front side of the second flange; the lower part of the movable front arm 3 is connected to the front side of the second flange by passing through the second pin hole on the front side of the second flange and the third pin hole on the lower part of the movable front arm 3; the upper part of the movable rear arm 4 is connected to the rear side of the first flange by passing through the second pin hole on the rear side of the first flange and the third pin hole on the upper part of the movable rear arm 4; the lower part of the movable rear arm 4 is connected to the rear side of the second flange by passing through the second pin hole on the rear side of the second flange and the third pin hole on the lower part of the movable rear arm 4. Thus, the upper and lower parts of the movable front arm 3 are respectively rotatably connected to the door knife movable plate 1 and the door knife main board 2, and the upper and lower parts of the movable rear arm 4 are respectively rotatably connected to the door knife movable plate 1 and the door knife main board 2, and in order to facilitate the fixing of the second pin, the third pin, the fourth pin and the fifth pin, the second pin, the third pin, the fourth pin and the fifth pin are all grooved pins.

[0028] A second through hole 8 in the shape of a long strip is provided on the second flange, and the first pin shaft 7 passes through the second through hole 8. The second through hole 8 limits the range of movement of the first pin shaft 7 to ensure the switching effect of the unlocking door knife between the working state and the non-working state.

[0029] In order to facilitate the fixing of the electric push rod 5, a fixing bracket 9 is provided on the door knife main board 2, the rear of the electric push rod 5 is connected to the fixing bracket 9 through a first bolt, and the fixing bracket 9 is connected to the second flange through a second bolt.

[0030] The front and rear sides of the door knife movable plate 1 are provided with downwardly inclined bending parts to facilitate the door knife movable plate 1 to contact the movable lock hook, further ensuring the use effect of the unlocking door knife.

[0031] like Figure 1-2 As shown in FIG. 1 , the fixed-height door knife commonly used in the current service elevator will produce collision noise when the door knife hits the movable lock hook every time it passes through a floor; Figure 3As shown in the figure, some service elevators use electromagnets instead of fixed-height door knives. Although this avoids the noise caused by collision, when the door opens at the designated floor, the rapid movement of the electromagnet will also generate a lot of noise; Figure 4-6 As shown, the height of the unlocking door knife of the utility model when the door is not opened is different from that when the door is opened, that is, the height when not working is lower than the height when working, so that when the goods elevator passes through the floors during operation, the unlocking door knife will not come into contact with the movable lock hook of the door lock, thereby avoiding collision with the movable lock hook to generate noise. When it reaches the designated floor, the electric push rod 5 directly drives the door knife movable forearm 3, so that it drives the door knife movable plate 1 to change in height and push open the movable lock hook. Since the electric push rod 5 moves in a straight line at a slow speed instead of a fast speed, it also avoids generating loud noise when opening the door.

[0032] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A door unlocking knife for a goods elevator, comprising a door unlocking knife body, characterized in that: The door knife body for unlocking includes a door knife movable plate and a door knife main plate arranged in upper and lower positions; A movable front arm and a movable rear arm are provided at the lower side of the door knife movable plate, the movable front arm is arranged at the front side of the movable rear arm, the upper and lower parts of the movable front arm are rotatably connected with the door knife movable plate and the door knife main board respectively, and the upper and lower parts of the movable rear arm are rotatably connected with the door knife movable plate and the door knife main board respectively; An electric push rod is installed on the door knife main board, and the lower part of the movable forearm is connected to a connecting piece arranged obliquely. The connecting piece is provided with a first through hole in the shape of an elongated strip, and a first pin shaft passes through the through hole, and the first pin shaft passes through a first pin shaft hole located at the front part of the electric push rod.

2. A cargo elevator door unlocking knife as claimed in claim 1, characterized in that: The movable forearm and the connecting piece adopt an integrated structure.

3. A door unlocking knife for a goods elevator as claimed in claim 1, characterized in that: The first pin shaft is a pin shaft with a groove.

4. A door unlocking knife for a goods elevator as claimed in claim 1 or 3, characterized in that: The left and right sides of the door knife main board are both provided with second flanges extending upwards, the second flanges are provided with second through holes in the form of long strips, and the first pin shaft passes through the second through holes.

5. A door unlocking knife for a goods elevator as claimed in claim 1, characterized in that: A fixing bracket is arranged on the door knife main board, and the rear part of the electric push rod is connected to the fixing bracket through a first bolt.

6. A door unlocking knife for a goods elevator as claimed in claim 1, characterized in that: The front and rear sides of the door knife movable plate are both provided with downwardly inclined bending parts.

Images