Double-screw elevator

Abstract

The utility model discloses a double-lead-screw elevator which comprises a machine body, a worm wheel shaft and a first transmission lead screw, the worm wheel shaft is installed in the machine body, and a worm input shaft matched with the worm wheel shaft is installed on the machine body; the top of the machine body is provided with a first fixing nut matched with the first transmission lead screw, the first transmission lead screw penetrates through the machine body and the worm wheel shaft, the first transmission lead screw is a hollow rod, the top of the first transmission lead screw is provided with a second fixing nut, and the second fixing nut is provided with a second transmission lead screw; and one end of the second transmission screw rod extends into the hollow structure of the first transmission screw rod. According to the utility model, when the worm gear rotates in the positive and negative directions, the first transmission screw rod is meshed with the first fixing nut and slides up and down along the key groove direction, and the second transmission screw rod is meshed with the second fixing nut fixed on the first transmission screw rod to ascend while the first transmission screw rod lifts the stroke; and the occasions with larger stroke requirements and relatively compact mounting space are met.

Description

Technical Field

[0001] This utility model relates to the field of lifting platform technology, specifically a double screw lifting platform. Background Technology

[0002] As a transportation device, the elevator is mainly used to realize the vertical lifting and transportation of goods. The common driving methods of elevators are winch lifting rope and screw drive.

[0003] The existing publication number CN212928694U discloses a trapezoidal screw jack with adjustable clearance, including a housing. A mounting base is provided at the bottom of the housing. An input shaft is horizontally mounted in the housing, and a worm gear is fixedly connected to the input shaft. A main shaft is mounted on the left side of the input shaft in the housing. A worm wheel is fixedly connected to the bottom of the main shaft, and the worm wheel meshes with the worm gear. A screw is provided at the upper end of the main shaft, and a screw sleeve is threaded onto the screw. A lifting seat is fixedly connected to the screw sleeve, and a connecting seat with a guide rod hole is provided at the bottom of the lifting seat. This utility model is a trapezoidal screw jack with adjustable clearance, high stability, large load capacity, and good protection.

[0004] Existing devices require a large space to achieve a large stroke, making them unsuitable for applications with limited installation space. Therefore, we propose a double screw jack. Utility Model Content

[0005] The purpose of this utility model is to provide a double screw jack to solve the problems in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a double screw jack, comprising a body, a worm gear shaft, and a first transmission screw. The worm gear shaft is installed inside the body, and a worm input shaft that cooperates with the worm gear shaft is installed on the body. A first fixing nut that cooperates with the first transmission screw is installed on the top of the body. The first transmission screw passes through the body and the worm gear shaft. The first transmission screw is a hollow rod. A second fixing nut is installed on the top of the first transmission screw. A second transmission screw is installed on the second fixing nut, and one end of the second transmission screw extends into the hollow structure of the first transmission screw.

[0007] Preferably, an output flange is provided at the end of the second transmission screw away from the first transmission screw, and the output flange and the second transmission screw are an integral structure.

[0008] Preferably, a pressure plate is installed at the bottom end of the first transmission screw, and a protective sleeve is installed at the bottom end of the machine body.

[0009] Preferably, the inner wall of the worm gear shaft is provided with a sliding key.

[0010] Preferably, an input bearing housing is installed at the top of the worm gear shaft, a bearing is installed between the worm gear shaft and the machine body, an oil seal is installed between the worm gear shaft and the machine body, a bearing is installed between the worm gear shaft and the input bearing housing, and an oil seal is installed between the worm gear shaft and the input bearing housing.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the sliding key is installed on the worm gear, and a keyway is provided on the lead screw and the sliding key are fixedly installed together. When the worm gear rotates in the forward and reverse directions, the first transmission lead screw meshes with the first fixed nut and slides up and down along the keyway. While the first transmission lead screw increases its stroke, the second transmission lead screw rises by meshing with the second fixed nut fixed on the first transmission lead screw, so as to meet the needs of larger stroke and the occasion where the installation space is relatively compact. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] In the diagram: 1. Pressure plate; 2. Protective sleeve; 3. Oil seal; 4. Bearing; 5. Machine body; 6. Worm gear shaft; 7. Slide key; 8. Input bearing seat; 9. First transmission screw; 10. First fixing nut; 11. Second fixing nut; 12. Second transmission screw; 13. Output flange; 14. Worm gear input shaft. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0016] Please see Figure 1In this embodiment of the utility model, a double screw jack includes a body 5, a worm gear shaft 6, and a first transmission screw 9. The worm gear shaft 6 is installed inside the body 5, and a worm input shaft 14 that cooperates with the worm gear shaft is also installed on the body 5. A first fixing nut 10 that cooperates with the first transmission screw 9 is installed on the top of the body 5. The first transmission screw 9 passes through the body 5 and the worm gear shaft. A sliding key 7 is provided on the inner wall of the worm gear shaft and is installed on the worm gear. A keyway is provided on the screw and is fixedly installed with the sliding key. When the worm gear rotates in both directions... The first transmission lead screw engages with the first fixed nut and slides up and down along the keyway. While the first transmission lead screw increases its stroke, the second transmission lead screw rises by engaging with the second fixed nut fixed on the first transmission lead screw to meet the application requirements of larger stroke. The first transmission lead screw 9 is a hollow rod. The top of the first transmission lead screw 9 is equipped with a second fixed nut 11. The second fixed nut 11 is equipped with a second transmission lead screw 12. One end of the second transmission lead screw 12 extends into the hollow structure of the first transmission lead screw 9.

[0017] The second transmission screw 12 is provided with an output flange 13 at the end away from the first transmission screw 9. The output flange 13 and the second transmission screw 12 are an integral structure. A pressure plate 1 is installed at the bottom end of the first transmission screw 9, and a protective sleeve 2 is installed at the bottom end of the machine body 5.

[0018] An input bearing housing 8 is installed at the top of the worm gear shaft. A bearing 4 is installed between the worm gear shaft and the machine body 5. An oil seal 3 is installed between the worm gear shaft and the machine body 5. A bearing 4 is installed between the worm gear shaft and the input bearing housing 8. An oil seal 3 is installed between the worm gear shaft and the input bearing housing 8.

[0019] The working principle of this utility model is as follows: the sliding key is installed on the worm gear, and a keyway is provided on the lead screw and the sliding key are fixedly installed together. When the worm gear rotates in the forward and reverse directions, the first transmission lead screw meshes with the first fixed nut and slides up and down along the keyway. While the first transmission lead screw increases its stroke, the second transmission lead screw rises by meshing with the second fixed nut fixed on the first transmission lead screw, so as to meet the application of larger stroke requirements.

[0020] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A twin screw rod lift comprising a body (5), a worm shaft (6) and a first drive screw rod (9), characterized in that: The machine body (5) is equipped with a worm gear shaft (6) and a worm input shaft (14) that cooperates with the worm gear shaft. A first fixing nut (10) that cooperates with the first transmission screw (9) is installed on the top of the machine body (5). The first transmission screw (9) passes through the machine body (5) and the worm gear shaft. The first transmission screw (9) is a hollow rod. A second fixing nut (11) is installed on the top of the first transmission screw (9). A second transmission screw (12) is installed on the second fixing nut (11). One end of the second transmission screw (12) extends into the hollow structure of the first transmission screw (9). The second transmission screw (12) is away from the first transmission screw. One end of the moving lead screw (9) is provided with an output flange (13), which is an integral structure with the second transmission lead screw (12); a pressure plate (1) is installed at the bottom end of the first transmission lead screw (9), and a protective sleeve (2) is installed at the bottom end of the machine body (5); a sliding key (7) is provided on the inner wall of the worm gear shaft; an input bearing seat (8) is installed at the top end of the worm gear shaft, a bearing (4) is installed between the worm gear shaft and the machine body (5), an oil seal (3) is installed between the worm gear shaft and the machine body (5), a bearing (4) is installed between the worm gear shaft and the input bearing seat (8), and an oil seal (3) is installed between the worm gear shaft and the input bearing seat (8).

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