A high and low position limiting device

Abstract

This utility model discloses a high / low position limiting device, specifically a travel limiting device comprising: a frame; a reducer mounted on the frame, the input shaft of which is connected to the transmission shaft of a transmission system; a triggering component fixedly mounted on the output shaft of the reducer; a bracket mounted on the frame and positioned around the output shaft of the reducer; a proximity switch and a mechanical switch, both mounted on the bracket; wherein the triggering component rotates with the output shaft of the reducer and can sequentially trigger the proximity switch and the mechanical switch; and a PLC control component electrically connected to the motor, the proximity switch, and the mechanical switch; capable of quickly and accurately determining the high or low position of the grab bucket, achieving precise and rapid limiting of the high and low positions of the grab bucket; ensuring limiting accuracy, facilitating the automation of slag grabbing operations, and improving equipment reliability.

Description

Technical Field

[0001] The technical field of this utility model's travel limit device is particularly related to a high and low position limit device. Background Technology

[0002] During the process of cleaning debris by the grab bucket type automatic bar screen cleaner or the process of grabbing debris by the garbage crane, it is necessary to extend the grab bucket into the bar screen surface to grab the debris and lift it to the garbage bin, or extend the grab bucket into the garbage pile surface of the garbage pit to grab the garbage and lift it to the predetermined location.

[0003] In the prior art, the high and low positions of the grab bucket's vertical stroke are usually achieved by limit switches on the equipment; that is, two limit switches are set at the high and low positions of the grab bucket's vertical stroke, and the control circuit is connected or disconnected by the collision of the grab bucket. This determines the position of the grab bucket's stroke, limits the grab bucket's stroke, and makes the grab bucket move back and forth automatically according to the stroke.

[0004] However, using limit switches to limit the grab bucket can only restrict the approximate height of the grab bucket, and cannot know the height of the grab bucket during its up and down movement. The limiting accuracy is low and the limiting is not timely. In addition, if only a single limit switch is used for limiting, the entire cleaning machine will not work properly when the limit switch fails, which is not conducive to the automation of the slag grabbing operation and reduces the reliability of the equipment. Utility Model Content

[0005] In view of the above problems, this utility model provides a high and low position limiting device, the purpose of which is to quickly and accurately determine the high and low positions of the grab bucket's vertical stroke, realize the rapid and accurate positioning of the grab bucket, and improve the reliability of the equipment.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A high / low position limit device is provided, comprising: a frame; a reducer mounted on the frame, the input shaft of the reducer being connected to the drive shaft of a transmission system; a triggering component fixedly mounted on the output shaft of the reducer; a bracket mounted on the frame and surrounding the output shaft of the reducer; a proximity switch and a mechanical switch, both mounted on the bracket; wherein the triggering component rotates with the output shaft of the reducer, and the triggering component can sequentially trigger the proximity switch and the mechanical switch; and a PLC control component electrically connected to the motor, the proximity switch, and the mechanical switch.

[0008] Furthermore, the support frame is a ring-shaped U-shaped track, and the U-shaped track, reducer, triggering component and frame are designed as an integrated structure.

[0009] Furthermore, the reducer is a single-shaft reducer, wherein the input shaft of the single-shaft reducer is rotatably mounted on the frame via bearings; the triggering component is mounted on the output shaft of the single-shaft reducer, and the output shaft and the U-shaped track are coaxially mounted.

[0010] Furthermore, along the circumferential direction of the U-shaped track, two proximity switches and two mechanical switches are installed at intervals of 180° to 340°.

[0011] Furthermore, the triggering component is fan-shaped, and a triangular-shaped cutout is provided in the middle of the triggering component.

[0012] Furthermore, a roller is rotatably provided on the toggle of the mechanical switch, the roller is to be moved by the triggering component, and the roller can make rolling contact with the triggering component.

[0013] The beneficial effects of this utility model are as follows: the triggering component can accurately trigger the proximity switch and the mechanical switch, and the PLC control component can know the high and low positions of the grab bucket's vertical stroke. It can quickly and accurately determine the high and low positions of the grab bucket and realize the accurate limit of the grab bucket; it improves the limit accuracy and precision, facilitates the automation of slag grabbing operations, and enhances the reliability of the equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the limiting device provided in the embodiments of this application.

[0015] Figure 2 This is a top view of the overall structure of the limiting device provided in the embodiment of this application.

[0016] Figure 3 This is a schematic diagram of the installation of the limit switch and mechanical switch provided in the embodiments of this application.

[0017] Among them, 1. Frame; 2. Triggering component; 21. Hollowed-out; 31. Proximity switch; 32. Mechanical switch; 321. Roller; 4. U-shaped track; 5. Single-axis reducer; 51. Input shaft; 52. Output shaft; 6. Bearing. Detailed Implementation

[0018] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0019] Reference Figure 1 and Figure 2As shown in the figure, this application discloses a high / low position limiting device, including: a frame 1; a reducer, which is mounted on the frame 1 and whose input shaft is connected to the transmission shaft of the transmission system; a triggering component 2, which is fixedly mounted on the output shaft of the reducer; a bracket, which is mounted on the frame 1 and located around the output shaft of the reducer; a proximity switch 31 and a mechanical switch 32, both mounted on the bracket; wherein, the triggering component 2 rotates with the output shaft of the reducer and can sequentially trigger the proximity switch 31 and the mechanical switch 32; and a PLC control component, which is electrically connected to the motor, the proximity switch 31, and the mechanical switch 32.

[0020] In practical use, when the grab moves up and down, the power transmitted by the transmission system can drive the transmission shaft of the transmission system to rotate. This can be achieved by the gear transmission inside the reducer, which in turn drives the output shaft of the reducer to rotate. The rotation of the trigger component 2 on the output shaft of the reducer triggers the proximity switch 31. The proximity switch 31 transmits a signal to the PLC control component, thereby stopping the motor that drives the grab to move up and down. This provides accurate high and low position limit signals for the lifting and lowering movement of the grab, enabling the grab to achieve high and low position limit.

[0021] During the rotation of the reducer's output shaft, the triggering component 2 can be driven to rotate synchronously. Both the proximity switch 31 and the mechanical switch 32 are set on the rotation path of the triggering component 2. The triggering component 2 can accurately trigger the proximity switch 31 (when the proximity switch 31 fails, the triggering component 2 can accurately trigger the mechanical switch 32). Each time the proximity switch 31 is triggered by the triggering component 2 (when the proximity switch 31 fails, the mechanical switch 32 is triggered by the triggering component 2 once), an electrical signal is transmitted to the PLC control component. By receiving the trigger signal through the PLC control component, the drive motor of the grab bucket stops running, thus achieving accurate limit positioning of the grab bucket.

[0022] It is worth mentioning that when the proximity switch 31 fails, the triggering component 2 can accurately trigger the mechanical switch 32 after rotating clockwise or counterclockwise past the proximity switch 31. When the proximity switch 31 is damaged, the PLC control component does not receive the trigger signal from the proximity switch 31. At this time, the drive motor of the grab bucket continues to run. After triggering the mechanical switch 32, the drive motor of the grab bucket stops running when the PLC control component receives the trigger signal from the mechanical switch 32. When the proximity switch 31 is damaged, the PLC control component will automatically alarm. This achieves dual limit protection and improves the reliability of the high and low limit devices and the overall equipment.

[0023] By using this invention, the high and low positions of the grab bucket can be quickly and accurately located, which facilitates the automation of slag grabbing operations and improves the reliability of the equipment.

[0024] It is worth mentioning that this utility model can not only be used in the debris grabbing device of the automatic cleaning machine of the grab bucket bar screen in sewage treatment, but also in the garbage hoisting equipment at the garbage treatment site, for the high and low position limit of the grab bucket for grabbing garbage.

[0025] It is worth mentioning that the PLC control component can be a commercially available PLC controller. First, the running program is input into the PLC controller. During the rotation of the transmission shaft of the transmission system, the PLC controller receives the electrical signals from the proximity switch 31 and the mechanical switch 32. The PLC controller transmits the electrical signals to the drive motor of the grab bucket. When the grab bucket reaches the predetermined high position and low position, the motor stops rotating.

[0026] It is worth mentioning that implementing PLC control logic through PLC programming languages ​​is a well-known existing technology in this field, and will not be elaborated here.

[0027] Preferably, the bracket is a ring-shaped U-shaped track 4 made of stainless steel; the proximity switch 31 and the mechanical switch 32 can be detachably installed on the U-shaped track 4 by bolts, which can flexibly change the installation position of the proximity switch 31 and the mechanical switch 32, realize the angleless adjustment of the proximity switch 31 and the mechanical switch 32, and have high limit accuracy and strong shock resistance.

[0028] Among them, the U-shaped track 4, reducer, triggering component 2 and frame 1 are integrated structural designs, which can be fixed by bolts or by welding, thereby improving the overall integrity and seismic resistance.

[0029] The reducer is a single-shaft reducer 5, wherein the input shaft 51 of the single-shaft reducer 5 is rotatably mounted on the frame 1 via bearing 6; the triggering component 2 is mounted on the output shaft 52 of the single-shaft reducer 5, and the output shaft 52 and the U-shaped track 4 are coaxially mounted.

[0030] Preferably, two proximity switches 31 and two mechanical switches 32 are provided at intervals of 180° to 340° along the circumferential direction of the U-shaped track 4.

[0031] In this embodiment, the triggering component 2 is fan-shaped, and a triangular cutout 21 is provided in the middle of the triggering component 2; thus forming a V-shaped triggering component 2 in the top view. The triangular triggering component 2, proximity switch 31, mechanical switch 32, U-shaped track 4 and reducer are integrated into one unit, which has strong shock resistance and high reliability.

[0032] In this embodiment, the combination of the U-shaped track 4 and the triggering component 2 has the characteristics of non-contact and precise positioning.

[0033] Reference Figure 3Specifically, a roller 321 is rotatably provided on the lever of the mechanical switch 32. The roller 321 is toggled by the triggering component 2 and can roll into contact with the triggering component 2.

[0034] In this embodiment, both the proximity switch 31 and the mechanical switch 32 are located above the triggering component 2. The proximity switch 31 can be triggered when the triggering component 2 moves below the proximity switch 31. When the triggering component 2 moves below the mechanical switch 32, the triggering component 2 can push the roller 321 upward to move the lever of the mechanical switch 32, thereby triggering the mechanical switch 32.

[0035] In this embodiment, the frame 1 is made of galvanized steel, and a gear or sprocket made of nylon is provided on the input shaft 51 as a kinetic energy input gear. The input shaft 51 can be connected to the transmission system through gear transmission or chain transmission. The kinetic energy input gear of the 3rd module and the RV series reducer have the characteristics of precision transmission. The proximity switch 31 and the mechanical switch 32 have the characteristics of high sensitivity, which improves the limiting accuracy of the high position and low position when the grab bucket rises and falls.

[0036] Those skilled in the art will understand that although preferred embodiments of the present invention have been described, those skilled in the art, once they learn the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention. Clearly, those skilled in the art can make various alterations and modifications to the present invention without departing from its spirit and scope. Thus, if these modifications and modifications of the present invention fall within the scope of the machine equivalents of the claims of the present invention, the present invention also intends to include these modifications and modifications.

Claims

1. A high / low position limiting device, characterized in that, include: Rack (1); The reducer is mounted on the frame (1), and the input shaft of the reducer is connected to the drive shaft of the transmission system; The triggering component (2) is fixedly mounted on the output shaft of the reducer; The bracket is set on the frame (1) and is located around the output shaft of the reducer; Both the proximity switch (31) and the mechanical switch (32) are mounted on the bracket; Among them, the triggering component (2) rotates with the output shaft of the reducer, and the triggering component (2) can trigger the proximity switch (31) and the mechanical switch (32) in sequence; The PLC control unit is electrically connected to the motor, proximity switch (31), and mechanical switch (32).

2. The high / low position limiting device according to claim 1, characterized in that, The support is a ring-shaped U-shaped track (4), and the U-shaped track (4), reducer, triggering component (2) and frame (1) are designed as an integrated structure.

3. The high / low position limiting device according to claim 2, characterized in that, The reducer is a single-shaft reducer (5), wherein the input shaft (51) of the single-shaft reducer (5) is rotatably mounted on the frame (1) via a bearing (6); the triggering component (2) is mounted on the output shaft (52) of the single-shaft reducer (5), and the output shaft (52) and the U-shaped rail (4) are coaxially mounted.

4. The high / low position limiting device according to claim 2, characterized in that, Along the circumferential direction of the U-shaped track (4), two proximity switches (31) and two mechanical switches (32) are provided at intervals of 180° to 340°.

5. The high / low position limiting device according to claim 1, characterized in that, The triggering component (2) is fan-shaped, and a triangular-shaped cutout (21) is provided in the middle of the triggering component (2).

6. The high / low position limiting device according to claim 1, characterized in that, A roller (321) is rotatably provided on the lever of the mechanical switch (32). The roller (321) is toggled by the triggering component (2), and the roller (321) can roll into contact with the triggering component (2).

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