Continuous and accurate positioning device for movable material distribution belt of electric furnace

Abstract

The utility model discloses a continuous and accurate positioning device for a movable material distribution belt of an electric furnace, which comprises a track which is transversely arranged at the upper parts of a plurality of mixing bins arranged in a line, one end of the track is a starting end, and the other end of the track is an ending end; a belt conveying mechanism is arranged on the upper portion of the rack, the lower portion of the rack is arranged on the track through a walking mechanism, and the belt conveying mechanism corresponds to a discharging port of the feeding mechanism; the stay wire displacement sensor is arranged at the starting end of the track, a stay wire on the stay wire displacement sensor is connected with the rack, and the stay wire is kept in a horizontal state; start-stop control parts of the belt conveying mechanism and the walking mechanism are connected with the PLC control system. And the signal output end of the stay wire displacement sensor is connected with the PLC control system.

Description

Technical Field

[0001] The utility model relates to the technical field of belt conveyor mechanism positioning equipment, in particular to a continuous and precise positioning device for a mobile cloth belt of an electric furnace. Background Art

[0002] In the electric furnace smelting production process, the function of the material distribution system is to transport the mixed materials proportioned by the batching station to the mixed material bin on the top of the electric furnace for buffering and waiting for use in the electric furnace smelting. An electric furnace generally has 4-10 mixed material bins. In the electric furnace material distribution system, a belt conveyor mechanism is usually used for material distribution. The belt conveyor mechanism needs to transport the mixed materials to each mixed material bin of the electric furnace. When the belt conveyor mechanism distributes materials to the target mixed material bin, the unloading port of the belt conveyor mechanism needs to be aligned with the feeding port of the target mixed material bin so that the mixed materials fall accurately into the mixed material bin. The material distribution system needs to locate the position of the belt conveyor mechanism to ensure that the unloading port of the belt conveyor mechanism moves accurately to the feeding port of the target mixed material bin.

[0003] At present, the existing positioning devices of the electric furnace belt conveyor mechanism generally adopt technologies such as travel switches and rotary encoders.

[0004] The output of the positioning device using the travel switch is a switch signal, which is discontinuous. The fabric belt has a large inertia when moving. The inertia causes the belt conveyor to stop with hysteresis, resulting in the belt conveyor exceeding the travel switch detection range during the positioning process and failing to position. Secondly, the positioning device using the travel switch and other technologies can only be detected when it is within the effective sensing range of the travel switch. After exceeding the effective detection range, the position information of the moving belt conveyor is in an unknown state relative to the control system. The control system usually uses the elimination method for positioning logic control, that is, the default setting is that the belt conveyor first moves in the positive direction to find the target position. If the limit switch is triggered during the positive direction movement, it stops, and then continues to move in the opposite direction to find the target position until the target position limit switch is triggered to complete the positioning. Therefore, the positioning device using the travel switch and other technologies has problems such as discontinuous positioning position, high failure rate in the positioning process, and low positioning efficiency.

[0005] Although the positioning device using an encoder can achieve continuous and real-time positioning requirements, its encoder must be installed on the driving wheel or the passive wheel of the belt conveyor mechanism; if the encoder is installed on the driving wheel, the driving wheel will slip when the belt conveyor mechanism is started, causing the position detected by the encoder positioning device to be smaller than the actual target mixed material bin position; if the encoder is installed on the passive wheel, there is a possibility that the passive wheel will be temporarily suspended due to uneven or shaking tracks, and the position detected by the encoder positioning when the passive wheel is suspended is larger than the actual target mixed material bin position; slipping, suspension and other phenomena cause the encoder to over-count or under-count, resulting in position errors of the belt conveyor mechanism, and the position errors will accumulate with the increase of running time, resulting in inaccurate positioning of the belt conveyor mechanism, causing problems such as material leakage, biased material distribution and wrong material distribution of the belt conveyor mechanism. Utility Model Content

[0006] In view of the above technical problems, the utility model provides a continuous and precise positioning device for a mobile cloth belt of an electric furnace.

[0007] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0008] A continuous and precise positioning device for a mobile cloth belt of an electric furnace, comprising:

[0009] The track is horizontally arranged on the upper part of a plurality of mixing silos arranged in a row, with one end being the starting end and the other end being the ending end;

[0010] A frame, the upper part of which is provided with a belt conveying mechanism, and the lower part is arranged on a track through a walking mechanism, wherein the belt conveying mechanism corresponds to the discharge port of the feeding mechanism;

[0011] The wire displacement sensor is arranged at the starting end of the track, the wire on which is connected to the frame, and the wire is kept in a horizontal state;

[0012] Among them, the start and stop control parts of the belt conveyor mechanism and the walking mechanism are connected to the PLC control system; the signal output end of the wire displacement sensor is connected to the PLC control system.

[0013] The wire displacement sensor is arranged at the beginning of the track through a sensor fixing frame; the wire of the wire displacement sensor is connected to the frame through the wire fixing frame arranged on the frame.

[0014] The starting end and the ending end of the track are both provided with limit switches, and the limit switches are electrically connected to the PLC control system;

[0015] The limit switch comprises:

[0016] The positive limit switch and the reverse limit switch are respectively arranged on the starting end and the ending end of the track through the limit mounting bracket;

[0017] Among them, a limit detection baffle is set on the frame to trigger the positive limit switch and the reverse limit switch.

[0018] Mechanical limiters are arranged on the front side of the positive limit switch and the rear side of the negative limit switch.

[0019] The track gauge of the track is smaller than the width of the mixing silo.

[0020] The beneficial effects of the utility model are:

[0021] 1. The utility model uses a wire displacement sensor to feedback the real-time position of the belt conveyor mechanism, so that the positioning position has real-time and continuity, solving the technical deficiencies of low precision, low efficiency and low reliability of the positioning device in the prior art;

[0022] 2. The utility model adopts a wire displacement sensor, and the fabric belt positioning position data fed back by the PLC control system is continuous real-time data, so that the fabric positioning process is continuous;

[0023] 3. The positioning position data fed back by the pull-wire displacement sensor of the utility model is real-time actual data, with small positioning data error and high precision; when positioning the cloth, the PLC control system compares the real-time position data and the target position data, determines the moving direction of the cloth belt moving mechanism, improves the cloth positioning efficiency, and reduces cloth failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the principle diagram of the utility model;

[0025] Figure numerals: 1. Pull wire displacement sensor, 11. Pull wire, 12. Sensor fixing bracket, 13. Pull wire fixing bracket, 2-limit switch, 21. Positive limit switch, 22. Reverse limit switch, 23. Limit detection baffle, 24. Limit mounting bracket, 3. Belt conveyor mechanism, 4. Track 5. Mixing silo, 6. Feeding mechanism, 7. Frame, 8. Traveling mechanism, 9. Mechanical limiter. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0027] like Figure 1As shown, a continuous and precise positioning device for a mobile material distribution belt of an electric furnace comprises: a track 4, which is horizontally arranged on the upper part of a plurality of mixed material bins 5 arranged in a row, one end of which is the starting end and the other end is the ending end, and the track gauge of the track 4 is smaller than the width of the mixed material bin 5; a frame 7, a belt conveyor mechanism 3 is arranged on the upper part, and the lower part is arranged on the track 4 through a traveling mechanism 8, wherein the belt conveyor mechanism 3 corresponds to the discharge port of the feeding mechanism 6; a wire displacement sensor 1, which is arranged on the starting end of the track 4, and the wire 11 thereon is connected to the frame 7 through a fixing ring, and the wire 11 is kept in a horizontal state; wherein the start and stop control parts of the belt conveyor mechanism 3 and the traveling mechanism 8 are connected to the PLC control system; the signal output end of the wire displacement sensor 1 is connected to the PLC control system, and the output signal of the wire displacement sensor 1 is analog type data, and the 485 communication format can be selected.

[0028] like Figure 1 As shown, the wire displacement sensor 1 is arranged at the beginning of the track 4 through a sensor fixing frame 12; the wire 11 of the wire displacement sensor 1 is connected to the frame 7 through a wire fixing frame 13 arranged on the frame 7.

[0029] like Figure 1 As shown, limit switches 2 are provided at both the starting and ending ends of the track 4, and the limit switches 2 are electrically connected to the PLC control system; the limit switch 2 comprises: a positive limit switch 21 and a reverse limit switch 22, which are respectively provided at the starting and ending ends of the track 4 through a limit mounting bracket 24; wherein a limit detection baffle 23 is provided on the frame 7 for triggering the positive limit switch 21 and the reverse limit switch 22; the limit switch 2 is a non-contact limit switch, and a contact limit switch is optionally available.

[0030] like Figure 1 As shown, mechanical limiters 9 are provided on the front side of the positive limit switch 21 and the rear side of the negative limit switch 22.

[0031] When the utility model is working, the position of the wire displacement sensor 1 is taken as the zero position, and the distance data are all taken as the reference object of the zero position.

[0032] The mixing silo 5 is numbered in ascending order according to the distance from the zero point position, and the numbers are 1#, 2#, 3#, 4#, ... respectively.

[0033] Set the feeding position of each mixing silo 5 to Ln. The feeding position of the mixing silo 5 is the actual distance from the center of the feeding port of the mixing silo 5 to the zero point position. Assume that the set distances are 1# mixing silo L1, 2# mixing silo L2, 3# mixing silo L3, 4# mixing silo L4...

[0034] In this example, the real-time position data R fed back by the wire-pulling displacement sensor 1 is obtained. At this time, the position data R represents the actual distance from the fixed ring of the wire 11 to the zero position.

[0035] In this example, the length of the belt conveying mechanism 3 is a fixed length. Therefore, the distance between the discharging position of the belt conveying mechanism 3 and the fixed ring of the wire 11 is a fixed length. Assume the fixed length is K; in this example, the discharging position of the belt conveying mechanism 3 is L, then the discharging position L of the belt conveying mechanism 3 is the sum of the fixed length K and the real-time position data R, that is, the discharging position L of the belt conveying mechanism 3 = R + K;

[0036] In this example, during the moving operation of the traveling mechanism 8, when the PLC control system issues a stop command, there is an inertia characteristic. The traveling mechanism 8 will continue to coast in the moving direction for a certain distance before stopping. Assume the coasting distance is M; in this example, the coasting distance of the traveling mechanism 8 is 10 cm - 12 cm.

[0037] In this example, due to the inertia characteristic during the stopping process of the traveling mechanism 8, a certain amount of allowable deviation needs to be set at the feeding position of the set mixing bin 5 to increase the effective interval range of the feeding position of the mixing bin 5, so as to improve the efficiency of cloth positioning and reduce the positioning failure rate. Assume the set effective deviation amount is d, then the effective range of the positioning target feeding position of the mixing bin 5 is Ln ± d;

[0038] In this example, the set effective deviation amount is half of the coasting distance, that is, d = M / 2; the set effective deviation amount is 5 cm; therefore, the minimum value Ln-Min of the effective interval range of the feeding position of the mixing bin 5 is Ln - 5 cm, and the maximum value Ln-Max is Ln + 5 cm.

[0039] In this example, the moving positioning process of the cloth belt includes:

[0040] The direction of moving the belt conveying mechanism 3 towards the zero position is the positive direction, and the direction of moving away from the zero position is the negative direction;

[0041] Compare the discharging position L of the belt conveying mechanism 3 with the effective intervals Ln-Min and Ln-Max of the feeding position of the target mixing bin;

[0042] If the relationship between the discharging position L of the belt conveying mechanism 3 and the effective intervals Ln-Min and Ln-Max of the feeding position of the target mixing bin is L > Ln-Max, the output judgment result is 1;

[0043] If the relationship between the discharging position L of the belt conveying mechanism 3 and the effective intervals Ln-Min and Ln-Max of the feeding position of the target mixing bin is L < Ln-Min, the output judgment result is -1;

[0044] If the relationship between the feed port position L of the belt conveyor mechanism 3 and the effective interval Ln-Min, Ln-Max of the target mixing bin feed position is Ln-Min≤L≤Ln-Max, the output judgment result is 0;

[0045] When the comparison result is 1, the PLC control system controls the travel mechanism 8 to move in the positive direction;

[0046] When the comparison result is -1, the PLC control system controls the walking mechanism 8 to move in the opposite direction;

[0047] When the comparison result is 0, the PLC control system controls the walking mechanism 8 to remain stationary;

[0048] When the comparison result is 0, it indicates that the material positioning is completed, and the PLC control system controls the flat belt of the belt conveyor mechanism 3 to run. After the flat belt runs for a certain period of time, the PLC control system controls the feeding mechanism 6 to run and transport the mixed material to the target mixed material bin 6.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A continuous and precise positioning device for a moving cloth belt of an electric furnace, characterized in that: include: The track (4) is transversely arranged on the upper part of a plurality of mixing bins (5) arranged in a row, with one end being a starting end and the other end being an ending end; A frame (7), the upper portion of which is provided with a belt conveying mechanism (3), and the lower portion of which is provided on a track (4) via a walking mechanism (8), wherein the belt conveying mechanism (3) corresponds to a discharge port of a feeding mechanism (6); A wire displacement sensor (1) is arranged at the starting end of the track (4), wherein the wire (11) on the sensor is connected to the frame (7), and the wire (11) is kept in a horizontal state; The start and stop control parts of the belt conveyor mechanism (3) and the walking mechanism (8) are connected to the PLC control system; and the signal output end of the wire displacement sensor (1) is connected to the PLC control system.

2. The continuous and precise positioning device for a mobile cloth belt of an electric furnace according to claim 1, characterized in that: The wire displacement sensor (1) is arranged at the start of the track (4) via a sensor fixing frame (12); the wire (11) of the wire displacement sensor (1) is connected to the frame (7) via a wire fixing frame (13) arranged on the frame (7).

3. The continuous and precise positioning device for a mobile cloth belt of an electric furnace according to claim 1, characterized in that: Limit switches (2) are provided at both the starting end and the ending end of the track (4), and the limit switches (2) are electrically connected to a PLC control system; The limit switch (2) comprises: A positive limit switch (21) and a negative limit switch (22) are respectively arranged on the starting end and the ending end of the track (4) through a limit mounting bracket (24); A limit detection baffle (23) is provided on the frame (7) for triggering the positive limit switch (21) and the reverse limit switch (22).

4. The continuous and precise positioning device for a mobile cloth belt of an electric furnace according to claim 3, characterized in that: Mechanical limiters (9) are provided on the front side of the positive limit switch (21) and the rear side of the negative limit switch (22).

5. The continuous and precise positioning device for a mobile cloth belt of an electric furnace according to claim 1, characterized in that: The track gauge of the track (4) is smaller than the width of the mixing silo (5).

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