Arc-shaped adjustable limiting device

Abstract

The utility model relates to a limiting structure technical field, and disclose a kind of adjustable limiting device of arc, comprising: limit plate, it is fixedly installed on rack, the limit plate has arc working surface;Arc guide slot, it is set on the limit plate, and it is along the track of arc working surface extension;Upper limit switch and lower limit switch, it is slidably installed on the arc guide slot by fastening assembly, and can be positioned at the different position of arc guide slot, and upper limit switch and lower limit switch are connected with electric control system signal;Limiting lever, it is used to move with the component that is limited movement.The utility model can accurately set the stroke range of moving component by sliding along the arc guide slot consistent with the movement track of controlled component, and fixed upper and lower limit switch, adapt to the pressure requirement under different working conditions;Only need to loosen fastening bolt, the position of upper and lower limit switch can be easily moved, adjust stroke range, easy to operate, save time and effort.

Description

Technical Field

[0001] This utility model relates to the field of limiting structure technology, specifically an arc-shaped adjustable limiting device. Background Technology

[0002] In mechanical equipment such as plow unloaders, there are often components that can move along a specific arc-shaped trajectory, such as the lower idler roller tray. This tray is usually connected to the frame through a linkage mechanism and driven by a drive device to raise and lower along a designed arc-shaped path, thereby adjusting the degree of clamping between it and the upper plow head and other mating components.

[0003] Currently, the pallet lifting stroke of such equipment often lacks an effective and adjustable limit mechanism. This makes it impossible to accurately set and adjust the upper and lower limit positions of the pallet according to different working conditions, such as the characteristics of the conveyed materials and wear conditions. As a result, it is difficult to optimize the clamping force between the pallet and the upper plow. Insufficient clamping force may lead to incomplete unloading, while excessive clamping force will accelerate the wear of the equipment.

[0004] Therefore, there is an urgent need for a limiting device that can flexibly and accurately set the travel range of arc-shaped moving parts. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model proposes an arc-shaped adjustable limiting device.

[0006] This utility model proposes an arc-shaped adjustable limiting device, comprising: a limiting plate, which is fixedly installed on a frame, the limiting plate having an arc-shaped working surface; an arc-shaped guide groove, which is formed on the limiting plate and extends along the trajectory of the arc-shaped working surface; an upper limit switch and a lower limit switch, which are slidably installed on the arc-shaped guide groove by fastening components and can be positioned at different positions in the arc-shaped guide groove, and the upper limit switch and the lower limit switch are connected to the signal of the electronic control system; and a limiting lever, which is used to move with the limited component, the working end of the limiting lever being arranged on the outside of the arc-shaped working surface of the limiting plate, and can trigger the upper limit switch or the lower limit switch during movement; To address the issues of "non-adjustable stroke limit and difficulty in optimizing clamping force" in curved moving parts (such as the lower idler roller tray of a plow-type unloader), this device achieves precise positioning through "curved guide + adjustable switch"; The arc-shaped working surface of the limit plate is consistent with the movement trajectory of the limited component. The arc-shaped guide groove extends along the trajectory. The upper / lower limit switch can be slidably positioned to adapt to the stroke requirements under different working conditions. For example, when conveying wet coal, the pallet lifting stroke can be increased to enhance the clamping force, and when conveying dry coal, the stroke can be decreased to reduce wear. The limit lever moves synchronously with the component. After triggering the switch, the drive equipment is started and stopped through the electrical control system to avoid incomplete unloading due to insufficient clamping force or wear of the equipment due to excessive clamping force. It is compatible with plow-type unloaders, arc gates and other arc-shaped motion equipment.

[0007] As a further optimization of this utility model, the number of the arc-shaped guide grooves is at least two, and each arc-shaped guide groove is concentrically arranged with a different radius; Multiple concentric arc-shaped guide grooves form a "multi-support point guide", avoiding the switch tilting caused by a single guide groove, ensuring that the switch trigger end and the limit lever are precisely aligned. The concentric design makes the switch sliding trajectory completely match the movement trajectory of the limited component, without additional lateral force, avoiding the deformation of the switch housing due to force, extending the service life of the switch, and adapting to high-frequency arc-shaped movements.

[0008] Furthermore, the housings of both the upper limit switch and the lower limit switch are provided with at least two sets of fastening components corresponding to at least two arc-shaped guide grooves respectively; Each set of switches is equipped with fastening components that match the number of guide slots. For example, two guide slots correspond to two sets of components. By locking multiple sets of components simultaneously, it is ensured that the switch housing and the limit plate fit tightly without any loose gaps. Compared with a single set of fastening, the multi-set design can prevent the switch from shifting due to vibration, making it suitable for strong vibration environments in industrial sites, such as mining unloading stations, and ensuring long-term stability of limit accuracy.

[0009] Furthermore, the fastening assembly includes a fastening bolt and a nut, the thread of the fastening bolt passes through the arc-shaped guide groove, and the switch housing is pressed and fixed to the limiting plate by tightening the nut; The fastening bolt passes through the arc-shaped guide groove, and the nut is a lock nut. After tightening, it provides preload to ensure that the switch is firmly fixed. The gap between the bolt and the guide groove provides adjustment margin for the switch to slide, which is convenient for precise positioning. The lock nut prevents loosening caused by vibration. It does not require frequent maintenance and is suitable for continuous operation scenarios.

[0010] As a further optimization of this utility model, the upper limit switch and the lower limit switch are mechanical limit switches, and their trigger ends are provided with rotatable switch handles. Mechanical limit switches have strong anti-interference capabilities and can adapt to dusty and humid environments. They have high triggering reliability and are more suitable for industrial sites than photoelectric switches. The switch handle can rotate, and the contact between the switch and the limit lever during triggering is a rolling friction, which reduces wear on both and extends the life of the triggering components.

[0011] Furthermore, after the switch handle contacts the working end of the limit lever, it is rotated, thereby triggering the action of the internal mechanism of the switch. When the working end of the limit lever contacts the switch handle, the internal contacts of the switch are triggered by rotating the handle, and a signal is transmitted to the electronic control system. This triggering method is a non-rigid impact, which avoids damage to the internal mechanism of the switch due to violent impact. At the same time, the point contact design between the lever and the handle ensures that reliable triggering can still be achieved even with slight installation deviations.

[0012] As a further optimization of this utility model, at least two arc-shaped guide grooves include a first arc-shaped groove and a second arc-shaped groove; the lower limit switch is slidably mounted on the first arc-shaped groove, and the upper limit switch is slidably mounted on the second arc-shaped groove; The first arc-shaped groove is for adjustment of the lower limit switch, corresponding to the low stroke of the limited component, such as the lowest position of the pallet. The second arc-shaped groove is for adjustment of the upper limit switch, corresponding to the high stroke, such as the highest position of the pallet. The separate adjustment design avoids mutual interference between the switches, improves the adjustment accuracy, and allows for precise setting of the stroke range according to the characteristics of the material, such as wet coal requiring a large clamping force and dry coal requiring a small clamping force, thereby optimizing the equipment operating parameters.

[0013] As a further optimization of this utility model, the radius of curvature of the arc-shaped working surface of the limiting plate is consistent with the radius of motion trajectory of the limited component, ensuring that the contact distance between the limiting lever and the switch handle remains constant, and avoiding trigger failure due to trajectory deviation.

[0014] As a further optimization of this utility model, the working end of the limit lever and the triggering mechanism of the upper limit switch or lower limit switch are in non-rigid contact when triggered; Non-rigid contacts, such as the rolling contact between the lever and the throttle, or the contact of elastic materials, can buffer the triggering impact force and prevent the switch triggering mechanism and lever from deforming due to rigid impact. For example, the working end of the lever is wrapped with a rubber sleeve, which not only ensures the reliability of triggering but also reduces wear, making it suitable for high-frequency triggering scenarios.

[0015] As a further optimization of this utility model, the device is used for lifting and limiting the lower idler roller group pallet in the plow-type unloader. In a plow-type unloader, the lower idler roller pallet needs to rise and fall along an arc-shaped trajectory to adjust the clamping force with the upper plow head. This device can precisely set the pallet lifting range: when the pallet rises to the upper limit position, the limit lever triggers the upper limit switch to stop the rise to avoid excessive clamping and reduce wear on the plow head and idler rollers; when it falls to the lower limit position, the lower limit switch is triggered to stop the fall to ensure the unloading clamping force and avoid unloading residue. This application can effectively improve unloading efficiency, extend equipment maintenance cycle, and adapt to the unloading needs of different materials such as coal and ore, making it highly versatile.

[0016] The arc-shaped adjustable limiting device proposed in this utility model has the following beneficial effects: (i) By sliding along the arc-shaped guide groove that is consistent with the movement trajectory of the controlled component and fixing the upper and lower limit switches, the stroke range of the moving component can be accurately set to adapt to the clamping force requirements under different working conditions. (ii) Simply loosen the fastening bolts to easily move the upper and lower limit switches and adjust the travel range. The operation is simple, time-saving and labor-saving. (iii) It adopts a mechanical switch and limit lever, which is reliable in triggering, has strong anti-interference ability, and is suitable for complex industrial environments; (iv) The design of double arc-shaped guide groove and double fastening bolts improves the stability of the switch on the limit plate and prevents position changes due to vibration and other reasons; (v) The device has a clear principle and a compact structure. It is not only suitable for plow-type unloaders, but also for other mechanical equipment that requires arc-shaped stroke limit.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the assembly structure of the arc-shaped adjustable limiting device and the plow-type unloader provided by this utility model. Figure 2 This utility model Figure 1 Enlarged structural diagram at point A; Figure 3 This is a schematic diagram of the arc-shaped adjustable limiting device provided by this utility model.

[0019] Attached diagram descriptions: 1. Frame; 2. Tray; 3. Limiting plate; 4. Arc-shaped guide groove; 41. First arc-shaped groove; 42. Second arc-shaped groove; 5. Lower limit switch; 6. Upper limit switch; 7. Limit lever; 8. Switch handle; 9. Fastening bolt. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] Please see Figures 1-3 An arc-shaped adjustable limiting device is installed on a plow-type unloader for limiting the height adjustment of the lower idler roller pallet. Specifically, it includes a limiting plate 3, which is installed on the frame 1 of the plow-type unloader. The limiting plate 3 is located below and to the side of the pallet 2, with a gap between them to allow for the lifting and lowering of the pallet 2. The upper end of the limiting plate 3 is arc-shaped and follows the arc-shaped lifting trajectory of the pallet 2. An arc-shaped guide groove 4 is formed along its arc-shaped trajectory. The two ends of the arc-shaped guide groove 4 extend to the upper and lower sides of the limiting plate 3, respectively. Both ends of the arc-shaped guide groove 4 are equipped with guides that can move along its arc. Two switches with sliding tracks are used to adjust the distance between them. A synchronously moving limit lever 7 is installed on the side of the tray 2. The free end of the limit lever 7 extends horizontally to the outside of the limit plate 3. When the tray 2 drives the limit lever 7 to rise or fall, the free end of the limit lever 7 contacts the switch and triggers the switch to act. The switch then transmits a signal to the electrical control box to control the start and stop of the drive equipment. By adjusting the height of the two switches, the upper and lower limits of the tray 2 can be adjusted so as to adjust the degree of pressure between the tray 2 and the upper plow head according to the actual use.

[0023] Specifically, such as Figure 3 As shown, a fastening bolt 9 is provided on the housing of the switch. The bolt shank of the fastening bolt 9 passes through the arc-shaped guide groove 4 and is threaded with a nut. By loosening the nut, the bolt can slide along the arc-shaped guide groove 4, thereby adjusting the height position of the switch. By tightening the nut, the switch can be fixed on the limit plate 3 to achieve height adjustment. Furthermore, there are two arc-shaped guide grooves 4, which are concentric and have different radii. Fastening bolts 9 are provided at both the top and bottom ends of the back of the switch housing. The two fastening bolts 9 correspond to the two arc-shaped guide grooves 4 respectively, which improves the sliding stability of the switch and also improves the locking stability of the switch.

[0024] Specifically, such as Figure 2 and Figure 3As shown, the two switches include a lower limit switch 5 located on the lower side of the limit plate 3 and an upper limit switch 6 located on the upper end of the limit plate 3. Both the lower limit switch 5 and the upper limit switch 6 are mechanical switches and have a switch handle 8 installed at their ends that extends beyond the arc edge of the limit plate 3. The switch handle 8 is rotatably connected to the adjacent switch. When the limit lever 7 moves up and down with the tray 2 in an arc shape, the free end of the limit lever 7 will abut against the free end of the adjacent switch handle 8, thereby driving the switch handle 8 to rotate. The rotation of the switch handle 8 drives the internal components of the switch, thereby generating a signal and transmitting it to the electrical control box to achieve precise control of the height adjustment of the tray 2. Furthermore, such as Figure 3 As shown, the arc-shaped guide groove 4 includes a first arc-shaped groove 41 and a second arc-shaped groove 42 that are concentrically arranged and have equal radii. There is a gap between the first arc-shaped groove 41 and the second arc-shaped groove 42. The lower limit switch 5 and the upper limit switch 6 are slidably mounted on the first arc-shaped groove 41 and the second arc-shaped groove 42, respectively, so that the lower limit switch 5 and the upper limit switch 6 have separate adjustment ranges, which facilitates actual adjustment and operation. Furthermore, both the lower limit switch 5 and the upper limit switch 6 have wires that connect to the electrical control box for transmitting electrical signals.

[0025] It should be noted that the arc-shaped guide groove 4 can be either a groove design opened on the limiting plate 3 or an arc-shaped slide rail design, which can be selected according to actual needs.

[0026] The working principle of this utility model is as follows: The device uses an arc-shaped limiting plate 3 that matches the movement trajectory of the pallet of the plow unloader as a reference. An upper limit switch 6 and a lower limit switch 5 that can slide and be fixed along the arc-shaped guide groove 4 are provided on the limiting plate 3. The limiting lever 7 fixed on the controlled component moves along the arc-shaped trajectory with the component. When it is necessary to adjust the movement stroke of the controlled component, first, according to the new upper and lower limit position requirements, loosen the fastening bolts 9 of the upper limit switch 6 and / or the lower limit switch 5, slide them along the arc-shaped guide groove 4 to the predetermined position, and then tighten them again. During the movement of the controlled component, when it reaches the set upper limit position, the limit lever 7 will trigger the upper limit switch 6; when it reaches the set lower limit position, the limit lever 7 will trigger the lower limit switch 5. After the switch is triggered, it immediately sends a signal to the electronic control system of the equipment. The electronic control system controls the drive equipment (such as a motor) to stop or reverse operation according to the signal, thereby accurately limiting the movement range of the controlled component between the preset upper and lower limits, realizing adjustable and automatic control of the stroke.

[0027] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An arc-shaped adjustable limiting device, characterized in that, include: A limiting plate (3) is fixedly installed on the frame (1), and the limiting plate (3) has an arc-shaped working surface; An arc-shaped guide groove (4) is formed on the limiting plate (3) and extends along the trajectory of the arc-shaped working surface; The upper limit switch (6) and the lower limit switch (5) are slidably mounted on the arc-shaped guide groove (4) by fastening components and can be positioned at different positions on the arc-shaped guide groove (4). The upper limit switch (6) and the lower limit switch (5) are connected to the signal of the electronic control system. The limit lever (7) is used to move with the limited component. The working end of the limit lever (7) is arranged on the outside of the arc-shaped working surface of the limit plate (3) and can trigger the upper limit switch (6) or the lower limit switch (5) during the movement.

2. The arc-shaped adjustable limiting device according to claim 1, characterized in that, The number of the arc-shaped guide grooves (4) is at least two, and each arc-shaped guide groove (4) is concentrically arranged and has a different radius.

3. The arc-shaped adjustable limiting device according to claim 2, characterized in that, The upper limit switch (6) and the lower limit switch (5) are each provided with at least two sets of fastening components corresponding to at least two arc-shaped guide grooves (4).

4. The arc-shaped adjustable limiting device according to claim 3, characterized in that, The fastening assembly includes a fastening bolt (9) and a nut. The bolt (9) passes through the arc-shaped guide groove (4) and the switch housing is pressed and fixed onto the limiting plate (3) by tightening the nut.

5. The arc-shaped adjustable limiting device according to claim 1, characterized in that, The upper limit switch (6) and lower limit switch (5) are mechanical limit switches, and their trigger ends are equipped with a rotatable switch handle (8).

6. The arc-shaped adjustable limiting device according to claim 5, characterized in that, After the switch handle (8) comes into contact with the working end of the limit lever (7), it is rotated, thereby triggering the action of the internal mechanism of the switch.

7. The arc-shaped adjustable limiting device according to claim 2, characterized in that, At least two arc-shaped guide grooves (4) include a first arc-shaped groove (41) and a second arc-shaped groove (42); The lower limit switch (5) is slidably mounted on the first arc-shaped groove (41), and the upper limit switch (6) is slidably mounted on the second arc-shaped groove (42).

8. The arc-shaped adjustable limiting device according to claim 1, characterized in that, The radius of curvature of the arc-shaped working surface of the limiting plate (3) is consistent with the radius of motion trajectory of the limited component.

9. The arc-shaped adjustable limiting device according to claim 1, characterized in that, The working end of the limit lever (7) is in non-rigid contact with the triggering mechanism of the upper limit switch (6) or the lower limit switch (5) when triggered.

10. An arc-shaped adjustable limiting device according to any one of claims 1-9, characterized in that, The device is used for lifting and limiting the lower idler roller tray (2) in the plow unloader.

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