Chain falling prevention device for coil unloading bracket platform

Abstract

The utility model discloses a chain falling prevention device for a coil unloading bracket platform, which belongs to the technical field of coil unloading bracket platform control and comprises a support, a limiting shaft and an early warning mechanism. The support is installed on the bracket platform, a hole position used for installing the bearing is formed in the support, and the bearing is installed in the hole position of the support and fixed. The limiting shaft penetrates through the inner ring of the bearing, and the minimum distance between the surface of the limiting shaft and the chain is 3-10 mm; one end of the limiting shaft is connected with an early warning mechanism, the early warning mechanism comprises a cylindrical swing rod, and the limiting shaft is vertically connected with the side face of the swing rod; one end of the swing rod is provided with a balancing weight, and the other end of the swing rod is provided with a signal sensor used for converting mechanical displacement into an electric signal to be output; according to the utility model, the technical problem that in the prior art, abnormal jumping of a chain in a chain wheel and chain transmission system of a coil unloading bracket platform is difficult to find in time, so that the chain is separated is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to unloading cradle platform control technical field especially relates to a unloading cradle platform anti chain-off device. BACKGROUND

[0002] In the unloading cradle platform of high-speed wire rod production line of rolling steel, sprocket and chain transmission system is mainly used to drive the lifting movement of the cradle bottom plate, and its working process is that the main sprocket is driven to rotate by a variable frequency motor, and the power is transmitted to the driven sprocket through the chain, so that the lifting control of the cradle bottom plate is realized. This transmission form can provide stable lifting power and meet the requirement of accurate positioning in the process of loading and unloading the coil.

[0003] In actual application, when the coil needs to be loaded and unloaded, the operator adjusts the height of the cradle bottom plate through the control system. The cradle bottom plate is connected with the driven sprocket through the chain, and the bottom plate is driven to lift by the transmission of the sprocket and chain. In normal working state, the sprocket teeth and the chain links are in good engagement, so that the lifting movement of the cradle bottom plate is stable and controllable.

[0004] However, since the unloading cradle platform needs to be lifted frequently, and each time it carries a coil with a large weight, the sprocket and chain system bears a large working load. With the extension of the service time, the sprocket teeth surface is gradually worn, and the gap between the inner and outer sleeves of the chain links is also continuously increased. This wear will cause the chain pitch to increase, so that the chain pitch cannot accurately correspond to the sprocket pitch, and the chain will jump during operation.

[0005] Especially when the cradle bottom plate carries the coil to lift, due to the large load, the worn sprocket and chain system may not engage well. At this time, the transverse swing amplitude of the chain will obviously increase, and even the chain may be separated from the sprocket teeth. Once the chain-off accident occurs, not only will the lifting function of the cradle bottom plate fail, but also serious safety accidents such as the coil falling may occur.

[0006] The wear of this sprocket and chain system is a gradual process, which is difficult to discover in time in daily use. The traditional solutions are too complex to implement, too high in cost to popularize, or too single in function to have limited effect. However, in such a special application as the unloading cradle platform, it is necessary to ensure the reliability of the anti chain-off device, consider the convenience of installation and maintenance, and also consider the cost-effectiveness, so it is necessary to develop a new type of anti chain-off solution. UTILITY MODEL CONTENTS

[0007] The utility model aims at providing a unloading cradle platform anti chain-off device to solve the technical problem that the abnormal jumping of the chain in the sprocket and chain transmission system of the unloading cradle platform is difficult to discover in time and causes chain-off.

[0008] In order to achieve the above object, the utility model provides the following technical scheme:

[0009] A coil unloading bracket platform anti-chain falling device, including support, limit shaft and early warning mechanism,

[0010] The support is installed on the bracket platform, and the support is provided with a hole position for installing a bearing, the bearing is installed in the hole position of the support and is fixed,

[0011] The limit shaft passes through the inner ring of the bearing and can rotate freely in the bearing, and the surface of the limit shaft is 3mm-10mm away from the chain,

[0012] One end of the limit shaft is connected with the early warning mechanism, the early warning mechanism includes a cylindrical swing rod, the limit shaft is connected with the side surface of the swing rod perpendicularly, one end of the swing rod is provided with a counterweight, the other end of the swing rod is provided with a signal sensor for converting mechanical displacement into electrical signal output, and the signal sensor and a signal processor interact with each other.

[0013] Preferably, the bearing is a deep groove ball bearing, which can provide bidirectional support force in the radial and axial directions for the limit shaft and ensure that the limit shaft rotates flexibly and stably.

[0014] Preferably, the limit shaft is cylindrical, and precise cooperation between the limit shaft and the inner ring of the bearing ensures the free rotation performance, the cylindrical surface can generate uniform friction force when the chain jumps and contacts, and stable transmission when contacting the chain is realized.

[0015] Preferably, the counterweight is detachably connected to the swing rod, and the sensitivity of the device can be changed by changing the position of the counterweight.

[0016] Preferably, a plurality of mounting holes for adjusting the mounting position of the counterweight are arranged on the swing rod, and the counterweight is detachably connected to any mounting hole position through fasteners.

[0017] Preferably, the swing rod is a cuboid structure, and the connection with the limit shaft is more firm and reliable, improving the durability and assembly accuracy of the structure.

[0018] Preferably, the signal sensor is a displacement signal sensor, and the signal processor is a PLC.

[0019] Preferably, the PLC is provided with a signal input port and an alarm signal output port, the signal output end of the displacement signal sensor is electrically connected with the signal input port of the PLC, and the alarm signal output port of the PLC is electrically connected with an alarm device.

[0020] Compared with the prior art, the utility model has the beneficial effects that:

[0021] The unloading roll bracket platform anti-chain falling device solves the technical problem that the abnormal chain jumping in the chain wheel and chain transmission system is difficult to be found in time to cause chain falling, realizes real-time monitoring and abnormal early warning of the chain running state through simple and reliable structure design and sensitive early warning mechanism, and effectively prevents the occurrence of chain falling failure.

[0022] The utility model discloses a limit shaft is connected with the vertically arranged swing bar through the structure design of setting up the limit shaft freely rotating at the chain running path side, and the structure design of keeping the predetermined distance with the chain, makes the chain abnormal jumping can be detected in time.

[0023] The utility model discloses the limit shaft is connected with the vertically arranged swing bar through the structure design of setting up the limit shaft freely rotating at the chain running path side, and the structure design of keeping the predetermined distance with the chain, makes the chain abnormal jumping can be detected in time.

[0024] The utility model discloses the limit shaft is connected with the vertically arranged swing bar through the structure design of setting up the limit shaft freely rotating at the chain running path side, and the structure design of keeping the predetermined distance with the chain, makes the chain abnormal jumping can be detected in time.

[0025] The utility model discloses the limit shaft is connected with the vertically arranged swing bar through the structure design of setting up the limit shaft freely rotating at the chain running path side, and the structure design of keeping the predetermined distance with the chain, makes the chain abnormal jumping can be detected in time.

[0026] The utility model discloses the limit shaft is connected with the vertically arranged swing bar through the structure design of setting up the limit shaft freely rotating at the chain running path side, and the structure design of keeping the predetermined distance with the chain, makes the chain abnormal jumping can be detected in time.

[0027] The utility model discloses the limit shaft is connected with the vertically arranged swing bar through the structure design of setting up the limit shaft freely rotating at the chain running path side, and the structure design of keeping the predetermined distance with the chain, makes the chain abnormal jumping can be detected in time. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a structure schematic view of preferred embodiments of the utility model.

[0029] In the drawing: 1, limit shaft; 2, bearing; 3, swing bar; 4, counterweight; 5, signal sensor. DETAILED DESCRIPTION

[0030] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model, and all other embodiments obtained by those skilled in the art without making creative efforts on the basis of the embodiments in the utility model belong to the protection scope of the utility model.

[0031] As Figure 1 Indicated:

[0032] From the design angle of the uncoiling bracket platform, the chain wheel and chain transmission itself has polygon effect. Since the chain is composed of rigid links, in the meshing process, when the chain passes through the chain wheel, the actual motion track is a polygon rather than an ideal circle, and this geometric characteristic inevitably leads to periodic fluctuation of the chain running speed, and produces inherent bounce.

[0033] From the load characteristics of the uncoiling bracket platform, the uncoiling bracket platform bears a large weight on the bracket bottom plate during the coil loading and unloading operation, and the weight changes frequently. This dynamic load will cause fluctuation of the chain tension, and even in normal use conditions, a certain amplitude of bounce will also be produced. This bounce phenomenon belongs to the fluctuation within the normal running range of the uncoiling bracket platform.

[0034] Therefore, with the increase of running time, wear and tear will inevitably occur between the chain wheel and the chain. Even if regular maintenance and lubrication are carried out, the wear and tear of parts cannot be completely avoided, and this wear and tear will lead to increase of the chain pitch, decrease of the meshing precision with the chain wheel teeth, and further increase of the chain bounce amplitude, and finally may lead to chain-off phenomenon.

[0035] Based on the inevitability of the chain bounce, the technical scheme proposed in the embodiment reasonably utilizes and controls the bounce, and avoids the chain-off phenomenon by combining the pressure shaft device and the early warning mechanism on the basis of controlling the jump chain.

[0036] An uncoiling bracket platform anti-chain-off device, comprising a support, a limit shaft 1 and an early warning mechanism.

[0037] The support is installed on the bracket platform, and a hole position for installing a bearing 2 is arranged on the support, the bearing 2 is installed in the hole position of the support and is fixed. Figure 1 The support is not drawn in the figure.

[0038] Specifically, the bearing 2 is a deep groove ball bearing, which can provide the limiting shaft 1 with bidirectional support force in radial and axial directions, and ensure the flexible and stable rotation of the limiting shaft 1; and the deep groove ball bearing has the characteristics of small friction coefficient, strong bearing capacity and long service life, so that the limiting shaft 1 can quickly respond to the chain touch and reliably rotate, effectively improving the timeliness and operation reliability of the device.

[0039] The limiting shaft 1 passes through the inner ring of the bearing 2 and can rotate freely in the bearing 2; the minimum distance between the surface of the limiting shaft 1 and the chain is X mm; for example, 3 mm to 10 mm.

[0040] Specifically, the minimum distance X between the surface of the limiting shaft 1 and the chain is adjustable, which can prevent false alarms when the chain slightly jumps, and when the chain jumping amplitude exceeds the set distance, the chain will generate a large friction force with the limiting shaft 1, driving the limiting shaft 1 to rotate violently and the swing rod 3 to produce a large swing amplitude, thereby triggering an alarm in time and effectively preventing chain falling accidents, improving the safety and reliability of the equipment operation.

[0041] The limiting shaft 1 is cylindrical and precisely fits with the inner ring of the bearing 2 to ensure the free rotation performance, and the cylindrical surface can generate uniform friction force when the chain jumps and contacts, realizing stable transmission when contacting with the chain. The cylindrical structure is simple and easy to manufacture, which can reduce production cost; the friction force of the cylindrical surface is uniform and stable when contacting with the chain, avoiding sudden impact force, making the early warning signal more reliable; the rotational inertia of the cylindrical part is uniform, which will not cause rotation imbalance due to irregular shape, improving the service life of the bearing 2; the cylindrical structure is uniformly stressed and has no stress concentration point, improving the service life and reliability of the part, facilitating the adjustment of the minimum distance between the chain, and having good adaptability.

[0042] One end of the limiting shaft 1 is connected to the early warning mechanism, which includes a cylindrical swing rod 3, and the limiting shaft 1 is connected perpendicularly to the side surface of the swing rod 3; one end of the swing rod 3 is provided with a counterweight 4 for maintaining the vertical state of the swing rod 3 when stationary, and the other end of the swing rod 3 is provided with a signal sensor 5 for converting mechanical displacement into electrical signal output; the signal sensor 5 interacts with the signal processor.

[0043] Specifically, when the chain generates a friction force with the limiting shaft 1, the limiting shaft 1 rotates to drive the swing lever 3 to swing, and the counterweight 4 on the swing lever 3 performs a circular motion, the radius of the circle being the distance from the center axis of the limiting shaft 1 to the center of the counterweight 4 at the end of the swing lever 3, which can be regarded as the distance from the connecting point of the limiting shaft 1 and the swing lever 3 to the counterweight 4; therefore, the longer the distance from the counterweight 4 to the connecting point of the limiting shaft 1 and the swing lever 3, the greater the torque generated by the same friction force, and thus a smaller chain friction force can drive the swing lever 3 to swing, that is, the higher the sensitivity of the device; the shorter the distance from the counterweight 4 to the connecting point of the limiting shaft 1 and the swing lever 3, the smaller the torque generated by the same friction force, and thus a larger chain friction force is required to drive the swing lever 3 to swing, that is, the lower the sensitivity of the device.

[0044] To this end, the counterweight 4 is detachably connected to the swing lever 3, specifically, a plurality of mounting holes for adjusting the mounting position of the counterweight 4 are arranged on the swing lever 3, and the counterweight 4 is detachably connected to any mounting hole position through a fastener; the distance between the counterweight 4 and the limiting shaft 1 is adjusted by selecting different mounting holes to change the detection sensitivity of the device.

[0045] The swing lever 3 has a rectangular cross section and a straight longitudinal direction. The swing lever 3 has the characteristics of uniform weight distribution and stable installation of the counterweight 4, so that the swing lever 3 can maintain a vertical position in a static state. The structure has uniform rotational inertia during the rotation of the swing lever 3, ensuring stable swing response and realizing a smooth alarm triggering function. The rectangular column structure is simple to process and firmly connected to the limiting shaft 1, improving the durability and assembly precision of the structure.

[0046] The signal sensor 5 is a displacement signal sensor, and in the embodiment, the model of the displacement signal sensor is APTAD16-22SM or XJLHE PG18-8NA.

[0047] The signal processor is a PLC, and in the embodiment, the model of the PLC is Siemens S7-1500; the PLC is provided with a signal input port and an alarm signal output port, the signal output end of the displacement signal sensor is electrically connected to the signal input port of the PLC, and the alarm signal output port of the PLC is electrically connected to the alarm device; the signal processor processes the chain displacement signals collected by the signal sensor 5 to realize real-time monitoring of the running state of the chain, and triggers an alarm signal when the chain displacement exceeds a preset range to realize real-time monitoring and early warning of the running state of the chain.

[0048] Working principle:

[0049] In the initial static state, the limiting shaft 1 is installed on the bracket through a deep groove ball bearing and can rotate freely, and the swing lever 3 remains in a vertical state under the action of the counterweight 4. The limiting shaft 1 maintains a preset minimum distance X from the chain, the displacement signal sensor is in an initial monitoring state, and the PLC system is ready for detection signal input.

[0050] When the chain is in a normal running state, due to the inherent polygon effect of the chain and sprocket transmission, the chain will produce a certain degree of periodic fluctuation. At this time, as long as the fluctuation amplitude is less than the preset distance X, the chain will not contact the limiting shaft 1, and the swing lever 3 will continue to remain in a vertical state. The displacement signal sensor continuously outputs a signal within a normal range, and the PLC confirms through signal processing that the chain and sprocket transmission system is in a safe running state.

[0051] When the chain abnormally jumps, if the jumping amplitude exceeds the preset distance X, the chain will contact the limiting shaft 1. According to the principle of friction, a friction force opposite to the direction of chain movement will be generated on the contact surface. Under the action of this friction force, the limiting shaft 1 will rotate in the same direction as the chain movement. Through the principle of moment transmission, the rotation of the limiting shaft 1 drives the swing lever 3 connected vertically thereto to swing. Due to the rectangular structure design of the swing lever 3 and the presence of the counterweight 4, this swing will produce a significant displacement.

[0052] In the signal detection and processing stage, the displacement signal sensor detects the displacement of the swing lever 3 in real time, and converts this mechanical displacement into an electrical signal. These analog signals are transmitted to the PLC, which first performs analog-to-digital conversion to convert the analog signals into digital signals, and then compares the processed digital signals with a preset threshold value. When the detected signal exceeds the preset threshold value, the PLC will immediately trigger an alarm signal.

[0053] In the alarm response stage, the alarm signal output by the PLC will activate the alarm device, timely prompting the operator to perform equipment inspection and necessary maintenance work. This timely early warning mechanism can effectively prevent chain falling accidents and improve the safety and reliability of equipment operation.

[0054] The sensitivity of the device can be adjusted in two ways: one is to control the trigger point by adjusting the distance X between the limiting shaft 1 and the chain; the other is to fine-tune the sensitivity by adjusting the position of the counterweight 4. This multi-parameter adjustable feature makes the device have strong adaptability and can be optimized according to actual working conditions.

[0055] The reliability of the device mainly embodies in three aspects: firstly, the deep groove ball bearing is adopted to provide stable supporting force, ensuring flexible rotation of the limiting shaft 1; secondly, the rectangular column-shaped swing rod 3 structure ensures the stability of movement and the reliability of early warning; finally, the PLC signal processing system based on preset threshold has good anti-interference ability.

[0056] In terms of maintenance, the device has simple structure and high standardization degree of parts, and is convenient to overhaul and replace. The adjustable parameters of the sensitivity of the device meet different working condition requirements, the timeliness of the early warning mechanism effectively reduces the equipment failure rate, and the maintenance efficiency is improved. Through the ingenious design of the mechanical structure and the reliable cooperation of the electronic detection, real-time monitoring and early warning of the abnormal jumping of the chain are realized, and a reliable guarantee is provided for the safe operation of the equipment.

[0057] The above-mentioned is only a preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An unloading carriage platform anti-sling device characterized by, The device comprises a support, a limiting shaft (1) and a pre-warning mechanism. The support is installed on a bracket platform, and a hole position for installing a bearing (2) is arranged on the support. The limiting shaft (1) passes through the inner ring of the bearing (2), and the surface of the limiting shaft (1) is 3-10 mm away from the chain. One end of the limiting shaft (1) is connected with the pre-warning mechanism, the pre-warning mechanism comprises a cylindrical swing lever (3), the limiting shaft (1) is connected with the side surface of the swing lever (3) perpendicularly, one end of the swing lever (3) is provided with a counterweight (4), the other end of the swing lever (3) is provided with a signal sensor (5) for converting mechanical displacement into electrical signal output, and the signal sensor (5) and a signal processor are in data interaction.

2. The de- webbing carriage platform anti- chain shedding device of claim 1, wherein, The bearing (2) is a deep groove ball bearing.

3. The de- webbing carriage platform anti- chain shedding device of claim 1, wherein, The limiting shaft (1) is cylindrical.

4. The de- webbing carriage platform anti- chain shedding device of claim 1, wherein, The counterweight (4) is detachably connected to the swing lever (3).

5. The de- webbing carriage platform anti- chain shedding device of claim 4, wherein, A plurality of mounting holes for adjusting the mounting position of the counterweight (4) are arranged on the swing lever (3), and the counterweight (4) is detachably connected to any mounting hole position through a fastener.

6. The de- webbing carriage platform anti- chain shedding device of claim 1, wherein, The swing lever (3) is a cuboid structure.

7. The de- webbing carriage platform anti- chain shedding device of claim 1, wherein, The signal sensor (5) is a displacement signal sensor, and the signal processor is a PLC.

8. The de- webbing carriage platform anti- chain shedding device of claim 7, wherein, The PLC comprises a signal input port and an alarm signal output port, the signal output end of the displacement signal sensor is electrically connected with the signal input port of the PLC, and the alarm signal output port of the PLC is electrically connected with an alarm device.

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