Limiting device for heavy-load AGV (Automatic Guided Vehicle) lifting mechanism

Abstract

The utility model provides a heavy-load AGV lifting mechanism limiting device which comprises a bottom plate, two side vertical plates perpendicular to the bottom plate are arranged on the bottom plate in parallel, a signal transmitter and a signal receiver which correspond to each other are arranged on the two side vertical plates respectively, a top plate is arranged between the ends, away from the bottom plate, of the two side vertical plates, and the top plate is connected with the signal transmitter and the signal receiver. An ejector rod is vertically arranged on the top plate in a sliding mode, the ejector rod is elastically supported in the direction away from the bottom plate, and a signal plate used for shielding or making up a signal transmission line between the signal transmitter and the signal receiver is arranged at the end, close to the bottom plate, of the ejector rod; according to the utility model, the influence on parts such as the driving motor is reduced, and the limiting stability and reliability are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of AGV, and particularly relates to a limit device for a lifting mechanism of a heavy-load AGV. Background Art

[0002] When using vehicles with lifting functions such as heavy-load AGVs, it is necessary to control the lifting mechanism to lift and lower. During the lowering process of the lifting mechanism, it is necessary to accurately control its position when it reaches the lowest position to avoid excessive lowering and damage to other supporting mechanisms such as ball screws, resulting in economic losses to users.

[0003] In the prior art, as shown in the Chinese utility model patent document with the authorization announcement number CN217437690U, a rotary lifting mechanism applicable to AGVs is disclosed. It uses a lowering limit mechanism to limit the lowering of the rotary mechanism to improve the stability and reliability of the lifting and lowering of the rotary mechanism. The lowering limit mechanism includes buffer rods, which are symmetrically distributed on the lifting support bottom plate. The length direction of the buffer rods is perpendicular to the plane where the lifting support bottom plate is located. When the rotary mechanism descends and contacts the upper ends of the buffer rods, the elastic telescopic ability at the upper ends of the buffer rods can buffer the descending state of the rotary mechanism. When the upper ends of the buffer rods are pressed to death, the buffer rods can limit the lowering of the rotary mechanism. In the above technology, the driving motor cannot be disconnected in time after reaching the limit during lowering. Due to the limiting effect of the lowering limit mechanism, the driving motor cannot rotate, which will cause the driving motor to heat up and is prone to damage the driving motor.

[0004] Therefore, it is necessary to design a limit device for a heavy-load AGV lifting mechanism that reduces the impact on components such as the driving motor and ensures the stability and reliability of the limit to solve the current technical problems. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the utility model provides a limit device for a heavy-load AGV lifting mechanism that reduces the impact on components such as the driving motor and ensures the stability and reliability of the limit.

[0006] The technical solution of the utility model is as follows: A limit device for a heavy-load AGV lifting mechanism includes a bottom plate. Two side plates perpendicular to the bottom plate are arranged in parallel on the bottom plate. Corresponding signal transmitters and signal receivers are respectively arranged on the two side plates. A top plate is arranged between the ends of the two side plates away from the bottom plate. A top rod is vertically slidably arranged on the top plate. The top rod is elastically supported in the direction away from the bottom plate. A signal plate for blocking or allowing the signal transmission path between the signal transmitter and the signal receiver is arranged at the end of the top rod close to the bottom plate.

[0007] A fixing plate is arranged between the middle parts of the two side vertical plates. A sliding section that is vertically and slidably connected to the fixing plate is provided on the ejector rod. One end of the sliding section is connected to the signal plate, and a spring is sleeved outside the sliding section between the fixing plate and the top plate.

[0008] One end of the sliding section has a second threaded rod, and a connecting threaded hole matching the second threaded rod is formed on the signal plate. The second threaded rod is connected in cooperation with the connecting threaded hole.

[0009] Observation holes corresponding to the spring are formed on the side vertical plates.

[0010] A guide plate perpendicular to the bottom plate and corresponding to the end of the side vertical plate is provided on the bottom plate. A sliding groove matching the end of the signal plate is formed on the guide plate, and the end of the guide plate is slidably arranged inside the sliding groove.

[0011] Limit pin shafts are symmetrically arranged on the bottom plate, and one end of each limit pin shaft is vertically and fixedly connected to the bottom plate.

[0012] One end of the limit pin shaft has a first threaded rod, and the first threaded rod is threadedly connected to the bottom plate.

[0013] Beneficial effects of the present utility model: In the present utility model, the limit device for the lifting mechanism of the heavy-duty AGV is installed on the top of the vehicle frame below the lifting mechanism. When the lifting mechanism descends, the lifting mechanism pushes the ejector rod downward. After the lifting mechanism descends in place, the ejector rod drives the signal plate to move downward until the signal transmission route between the signal transmitter and the signal receiver is just blocked. After the signal receiver fails to receive the signal, it sends a signal to the controller, and the controller immediately controls the drive motor that drives the lifting mechanism to descend to stop running, reducing the impact on components such as the drive motor and ensuring the stability and reliability of the limit. Description of the Drawings

[0014] Figure 1 It is a schematic installation structure diagram of the limit device for the lifting mechanism of the heavy-duty AGV in the present utility model.

[0015] Figure 2 It is a schematic structure diagram of the limit device for the lifting mechanism of the heavy-duty AGV in the present utility model.

[0016] Figure 3 It is Figure 2 The sectional view at A-A in

[0017] Figure 4 It is a schematic structure diagram of the limit pin shaft in the present utility model.

[0018] Figure 5 It is a schematic structure diagram of the guide plate in the present utility model.

[0019] Figure 6 This is a schematic structural view of the signal board in the present utility model.

[0020] Figure 7 This is a schematic structural view of the ejector rod in the present utility model. Detailed implementation manners

[0021] Now, various exemplary embodiments of the present utility model will be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and does not impose any limitation on the present utility model and its application or use. The present utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present utility model thorough and complete and to fully convey the scope of the present utility model to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the compositions of materials, numerical expressions and values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0022] The "first", "second" and similar terms used in the present utility model do not denote any order, quantity or importance, but are only used to distinguish different parts. Words such as "including" or "comprising" mean that the elements before this word cover the elements listed after this word, and do not exclude the possibility of also covering other elements. "Upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0023] Such as Figures 1 to 3As shown in the figure, the overload AGV lifting mechanism limit device 100 includes a bottom plate 1. Two side plates 4 perpendicular to the bottom plate 1 are arranged in parallel on the bottom plate 1. Corresponding signal transmitters 3 and signal receivers 11 are respectively arranged on the two side plates 4. A top plate 8 is arranged between the ends of the two side plates 4 away from the bottom plate 1. A top rod 10 is vertically slidably arranged on the top plate 8. The top rod 10 is elastically supported in the direction away from the bottom plate 1. A signal plate 6 for blocking or allowing the signal transmission route between the signal transmitter 3 and the signal receiver 11 is arranged at the end of the top rod 10 close to the bottom plate 1. In this embodiment, the overload AGV lifting mechanism limit device 100 is installed on the top of the vehicle frame below the lifting mechanism 200. When the lifting mechanism 200 descends, the lifting mechanism 200 pushes the top rod 10 downward. After the lifting mechanism 200 descends in place, the top rod 10 drives the signal plate 6 to move downward until the signal transmission route between the signal transmitter 3 and the signal receiver 11 is just blocked. After the signal receiver 11 fails to receive the signal, it sends a signal to the controller, and the controller immediately controls the drive motor that drives the lifting mechanism 200 to stop running, reducing the impact on components such as the drive motor and ensuring the stability and reliability of the limit. When the lifting mechanism 200 ascends, under the action of the elastic support, the top rod 10 drives the signal plate 6 to reset, the signal transmission route between the signal transmitter 3 and the signal receiver 11 is vacated, and the signal receiver 11 can receive the signal emitted by the signal transmitter 3, waiting for the next limit control of the lifting mechanism 200 to descend.

[0024] In the above embodiment, the signal receiver 11 and the signal transmitter 3 are a pair of opposed photoelectric switches, and the signal transmission route is the opposed optical path between the signal transmitter 3 and the signal receiver 11.

[0025] In some embodiments, as Figure 3 and 7 shown, a fixing plate 7 is arranged between the middle parts of the two side plates 4. The top rod 10 has a sliding section 102 that is vertically slidably connected to the fixing plate 7. One end of the sliding section is connected to the signal plate 6. A spring 9 is sleeved outside the sliding section between the fixing plate 7 and the top plate 8. Specifically, the end of the fixing plate 7 is fixedly assembled to the side plate 4 by bolts. A through hole matching the sliding section 102 is formed on the fixing plate 7. The sliding section 102 is slidably arranged inside the through hole. There is a step between the end of the sliding section 102 away from the signal plate 6 and the main body of the top rod 10. One end of the spring 9 abuts against the step, and the other end abuts against the fixing plate 7. The elastic support of the top rod 10 in the direction away from the bottom plate 1 is realized through the spring 9.

[0026] In some embodiments, as Figure 6 and 7As shown, one end of the sliding section 102 has a second threaded rod 101. A connecting threaded hole 61 matching the second threaded rod 101 is formed on the signal board 6, and the second threaded rod 101 is connected in cooperation with the connecting threaded hole 61.

[0027] In some embodiments, as Figure 3 shown, an observation hole 41 corresponding to the spring 9 is formed on the side vertical plate 4. Through the observation hole 41, the working states of the spring 9 and the ejector rod 10 can be observed, and abnormal conditions can be detected in a timely manner.

[0028] In some embodiments, as Figure 3 and 5 shown, a guide plate 5 perpendicular to the bottom plate 1 and corresponding to the end of the side vertical plate 4 is provided. A sliding groove 51 matching the end of the signal board 6 is formed on the guide plate 5, and the end of the guide plate 5 is slidably arranged inside the sliding groove 51, improving the stability of the movement of the guide plate 5.

[0029] In some embodiments, limiting pin shafts 2 are symmetrically arranged on the bottom plate 1. One end of the limiting pin shaft 2 is vertically and fixedly connected to the bottom plate 1. If the signal receiver 11 and the signal generator 3 fail, the bottom plate of the lifting mechanism 200 will contact the end of the limiting pin shaft 2, forcibly preventing the lifting mechanism 200 from continuing to operate, playing a role of secondary limiting, and increasing the safety and reliability of the limiting device 100 of the heavy-load AGV lifting mechanism.

[0030] In some embodiments, as Figure 4 shown, one end of the limiting pin shaft 2 has a first threaded rod 21, and the first threaded rod 21 is threadedly connected to the bottom plate 1.

[0031] So far, the embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed here based on the above description.

[0032] The above-described embodiments only represent some implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. An overload AGV lifting mechanism limit device, characterized in that: It includes a bottom plate, two side panels perpendicular to the bottom plate are arranged in parallel with each other, and corresponding signal transmitters and signal receivers are respectively arranged on the two side panels. A top plate is arranged between the ends of the two side panels facing away from the bottom plate, and a top rod is arranged on the top plate for vertical sliding. The top rod is elastically supported in the direction away from the bottom plate, and a signal plate for blocking or giving way to the signal transmission route between the signal transmitter and the signal receiver is arranged on the end of the top rod close to the bottom plate.

2. The overload AGV lifting mechanism limit device according to claim 1, wherein: A fixed plate is provided between the middle parts of the two side vertical plates, and the top rod has a sliding section that is vertically slidably connected to the fixed plate. One end of the sliding section is connected to the signal plate, and a spring is sleeved on the outside of the sliding section between the fixed plate and the top plate.

3. The overload AGV lifting mechanism limit device according to claim 2, characterized in that: One end of the sliding section is provided with a second threaded rod, and a connecting threaded hole matching the second threaded rod is provided on the signal plate, and the second threaded rod is matched and connected with the connecting threaded hole.

4. The overload AGV lifting mechanism limit device according to claim 2, characterized in that: The side plate is provided with an observation hole corresponding to the spring.

5. The overload AGV lifting mechanism limit device according to claim 1, characterized in that: A guide plate corresponding to the end of the side plate is vertically arranged on the bottom plate, and a sliding groove matching the end of the signal plate is opened on the guide plate, and the end of the guide plate is slidably arranged inside the sliding groove.

6. The overload AGV lifting mechanism limit device according to claim 1, characterized in that: The bottom plate is symmetrically provided with a limit pin shaft, and one end of the limit pin shaft is vertically fixedly connected to the bottom plate.

7. The overload AGV lifting mechanism limit device according to claim 6, characterized in that: One end of the limiting pin shaft is provided with a first threaded rod, and the first threaded rod is threadedly connected to the base plate.

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