Friction type elevator load abnormity monitoring method
By calculating the lower limit of the theoretical intersecting current of the bucket and comparing the actual current value, determining the residual coal of the bucket and taking locked loading measures, the problem of emergency stopping of the overload of the elevator caused by the residual coal of the bucket is solved, ensuring the safety of the wellbore equipment.
Patent Information
- Application Number
- CN202411796457.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-02-14
AI Technical Summary
In the prior art, the remaining coal of the skip caused the secondary coal load of the skip, and the elevator experienced an emergency stop and failure of overload, endangering the safety of the wellbore equipment.
By calculating the lower limit of the theoretical intersection current of the skip, comparing the actual intersection current value and the theoretical lower limit value, determining whether the skip is left with coal, and preventing secondary coal loading through the downstream skip locking load.
Effectively monitor the load of the skip to prevent residual coal from skip to avoid emergency stopping of the elevator overload, and ensure the safety of the wellbore equipment.
Smart Images
Figure CN119429908A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of friction hoists, and in particular to a method for monitoring load anomalies of friction hoists. Background Art
[0002] In the main shaft hoisting system of coal mines, in order to ensure hoisting safety, the hoist is not allowed to lift up when overloaded, nor can the bucket be lowered when overloaded, otherwise it is easy to cause serious hoisting accidents such as bucket falling and motor burning. In the actual operation of the hoist, when the coal flow is wet and sticky, it is easy for the bucket to have excess coal and not be unloaded completely, resulting in the bucket being loaded with coal twice, and the hoist having an overload emergency stop failure, which endangers the safety of the shaft equipment. Summary of the invention
[0003] The purpose of the present invention is to provide a method for monitoring abnormal load of a friction hoist, aiming to solve the technical problem in the prior art that there is residual coal in the skip, which leads to secondary loading of coal in the skip and an overload emergency stop of the hoist, endangering the safety of shaft equipment.
[0004] In order to solve the above technical problems, the technical solution of the present invention is:
[0005] A method for monitoring load anomaly of a friction hoist comprises the following steps:
[0006] Step 1: Calculate the theoretical lower limit of the bucket intersection current I l , the calculation formula is:
[0007] I l =A×W s ;
[0008] Among them, A is the current anomaly coefficient, W s The actual amount of coal loaded in the upward skip;
[0009] A is determined by the following formula:
[0010] A=0.9×I a ;
[0011] Among them, I a is the theoretical current value per ton of coal;
[0012] Step 2: Compare the actual intersection current value with the theoretical intersection current lower limit value. If the actual intersection current value is less than the theoretical intersection current lower limit value, determine the remaining coal in the descending bucket.
[0013] Step 3: Lock the downward skip for loading and manually lift the downward skip back to the unloading position. After confirming that the remaining coal has been unloaded, the downward skip resumes normal loading.
[0014] Preferably, the friction hoist includes a quantitative bin weighing system, an AC drive system and an abnormality monitoring system. The quantitative bin weighing system weighs the quantitative bin to obtain the actual coal loading amount of the ascending skip and transmits the signal to the abnormality monitoring system. The AC drive system transmits the actual intersection current value of the skip to the abnormality monitoring system. The abnormality monitoring system calculates the theoretical intersection current lower limit value and determines whether there is residual coal in the descending skip.
[0015] Preferably, the friction hoist also includes a loading control system, and after the abnormal monitoring system determines that there is residual coal in the descending skip, the loading control system controls the descending skip to lock the loading.
[0016] Preferably, the area where the skip hoisting height is in the range of 370m-410m is the skip intersection area.
[0017] Preferably, the friction hoist also includes a timer electrically connected to the abnormal monitoring system. After the abnormal monitoring system determines that there is residual coal in the descending skip, the timer starts timing. After the timer finishes timing, the loading control system controls the descending skip to lock the loading.
[0018] Preferably, the alarm is electrically connected to the timer, and the alarm sounds after the timer has finished timing.
[0019] Preferably, the timing time of the timer is two seconds.
[0020] After adopting the above technical solution, the beneficial effects of the present invention are:
[0021] The present invention can monitor the load of the bucket by comparing the actual intersection current value with the theoretical intersection current lower limit value, judge whether the bucket has excess coal, and take measures in advance when the bucket has excess coal. If it is necessary to detect whether the descending bucket has excess coal, it is only necessary to detect the actual coal loading of the ascending bucket and the actual current value at the intersection position, and calculate the theoretical intersection current lower limit value according to the actual coal loading. If the actual value is less than the lower limit value, it can be determined that the descending bucket has excess coal, and the downstream bucket is locked for loading to prevent secondary coal loading. The elevator driver must manually lift the descending bucket back to the unloading position, and normal coal loading can be resumed only after confirming that the excess coal has been unloaded. The timer provided in the present invention can avoid unnecessary alarms caused by accidental situations. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a schematic diagram of the principle of residual coal detection in skip B;
[0023] Figure 2 This is a schematic diagram of the principle of residual coal detection in skip A;
[0024] Figure 3 It is the control schematic diagram. DETAILED DESCRIPTION
[0025] The present invention will be further described below in conjunction with the accompanying drawings.
[0026] The orientations mentioned in this specification are based on the orientations of the method for monitoring abnormal load of a friction hoist of the present invention during normal operation, and are not limited to the orientations during storage and transportation. They only represent relative positional relationships, not absolute positional relationships.
[0027] Embodiment 1:
[0028] A method for monitoring load anomaly of a friction hoist comprises the following steps:
[0029] Step 1: Calculate the theoretical lower limit of the bucket intersection current I l , the calculation formula is:
[0030] I l =A×W s ;
[0031] Among them, A is the current anomaly coefficient, W s The actual amount of coal loaded in the upward skip;
[0032] A is determined by the following formula:
[0033] A=0.9×I a ;
[0034] Among them, I a is the theoretical current value per ton of coal;
[0035] Step 2: Compare the actual intersection current value with the theoretical intersection current lower limit value. If the actual intersection current value is less than the theoretical intersection current lower limit value, determine the remaining coal in the descending bucket.
[0036] Step 3: Lock the downward skip for loading and manually lift the downward skip back to the unloading position. After confirming that the remaining coal has been unloaded, the downward skip resumes normal loading.
[0037] Among them, the area where the skip lifting height is between 370m and 410m is the skip intersection area.
[0038] Furthermore, the friction hoist also includes a timer electrically connected to the abnormal monitoring system. After the abnormal monitoring system determines that there is residual coal in the descending skip, the timer starts timing. After the timer finishes timing, the loading control system controls the descending skip to lock the loading.
[0039] The alarm is electrically connected to the timer, and the alarm sounds after the timer finishes timing.
[0040] Specifically, the timing time of the timer is two seconds. The timer is set in the present invention to avoid unnecessary alarms caused by accidental situations.
[0041] The friction elevator in the present invention is a double-bucket elevator. In the double-bucket elevator, one bucket A is loaded upward and the other bucket B is unloaded downward. When the two buckets run to a fixed position, such as the intersection area of the two buckets, the motor current is basically a fixed value. However, if there is excess coal in the unloading bucket, the actual intersection current will be smaller than the above fixed value. The present invention judges whether there is excess coal in the unloading bucket by comparing the actual intersection current value with the theoretical intersection current value, and takes measures in advance when there is excess coal in the bucket.
[0042] When bucket A is loaded and moving upward, bucket B is unloaded and moving downward. s In order to load the actual coal loading capacity of bucket A, the theoretical intersection current lower limit is calculated by the formula, and the actual intersection current value is compared with the theoretical intersection current lower limit. If the actual intersection current value is less than the theoretical intersection current lower limit, it is determined that there is residual coal in bucket B. The elevator driver manually lifts bucket B back to the unloading position. After confirming that the residual coal has been unloaded, bucket B resumes normal coal loading.
[0043] When bucket B is loaded and moving upward, bucket A is unloaded and moving downward. s In order to load the actual coal loading capacity of bucket B, the theoretical intersection current lower limit is calculated by the formula, and the actual intersection current value is compared with the theoretical intersection current lower limit. If the actual intersection current value is less than the theoretical intersection current lower limit, it is determined that there is residual coal in bucket A. The elevator driver manually lifts bucket A back to the unloading position. After confirming that the residual coal has been unloaded, bucket A resumes normal coal loading.
[0044] This method can monitor the load of the bucket by comparing the actual intersection current value with the theoretical intersection current lower limit value, judge whether the bucket has excess coal, and take measures in advance when there is excess coal in the bucket. If you want to detect whether the downward bucket has excess coal, you only need to detect the actual coal loading of the upward bucket and the actual current value at the intersection position, calculate the theoretical intersection current lower limit value by the actual coal loading, if the actual value is less than the lower limit value, it can be determined that there is excess coal in the downward bucket, and the downward bucket can be locked for loading to prevent secondary loading. The elevator driver must manually lift the downward bucket back to the unloading position, and after confirming that the excess coal is unloaded, normal loading can be resumed.
[0045] Embodiment 2:
[0046] like Figure 1 , Figure 2 and Figure 3As shown, the friction hoist includes a quantitative bin weighing system, an AC drive system and an abnormal monitoring system. The quantitative bin weighing system weighs the quantitative bin to obtain the actual coal loading amount of the upward skip and transmits the signal to the abnormal monitoring system. The AC drive system transmits the actual intersection current value of the skip to the abnormal monitoring system. The abnormal monitoring system calculates the theoretical intersection current lower limit and determines whether there is excess coal in the downward skip. The transport loader feeds the quantitative bin through the feeder. The quantitative bin weighing system is a weighing sensor set on the quantitative bin, which weighs the materials loaded in the quantitative bin. The weighing value is the actual coal loading amount of the upward skip. The quantitative bin loads materials into the skip.
[0047] Furthermore, the friction hoist also includes a loading control system. After the abnormal monitoring system determines that there is residual coal in the descending skip, the loading control system controls the descending skip to lock the loading.
[0048] Among them, the area where the skip lifting height is between 370m and 410m is the skip intersection area.
[0049] Furthermore, the friction hoist also includes a timer electrically connected to the abnormal monitoring system. After the abnormal monitoring system determines that there is residual coal in the descending skip, the timer starts timing. After the timer finishes timing, the loading control system controls the descending skip to lock the loading.
[0050] The alarm is electrically connected to the timer, and the alarm sounds after the timer finishes timing.
[0051] Specifically, the timing time of the timer is two seconds. The timer is set in the present invention to avoid unnecessary alarms caused by accidental situations.
[0052] The friction elevator in the present invention is a double-bucket elevator. In the double-bucket elevator, one bucket A is loaded upward and the other bucket B is unloaded downward. When the two buckets run to a fixed position, such as the intersection area of the two buckets, the motor current is basically a fixed value. However, if there is excess coal in the unloading bucket, the actual intersection current will be smaller than the above fixed value. The present invention judges whether there is excess coal in the unloading bucket by comparing the actual intersection current value with the theoretical intersection current value, and takes measures in advance when there is excess coal in the bucket.
[0053] Among them, the theoretical intersection current lower limit value I l , the calculation formula is:
[0054] I l =A×W s ;
[0055] Among them, A is the current anomaly coefficient, W s The actual amount of coal loaded in the upward skip;
[0056] A is determined by the following formula:
[0057] A=0.9×I a ;
[0058] Among them, I a It is the theoretical current value per ton of coal.
[0059] The abnormality detection process of the elevator is as follows:
[0060] Before the bucket A is loaded, the weighing sensor A transmits the weight of the material loaded in the quantitative bin A, that is, the actual amount of coal loaded in the bucket A, to the abnormal monitoring system, and the abnormal monitoring system calculates the theoretical lower limit of the intersection current, W s is the actual coal loading amount of bucket A. When bucket A is loading and moving upward, bucket B is unloading and moving downward. When the lifting height of bucket A and bucket B is in the range of 370m-410m, the current value of the AC drive system motor, that is, the actual intersection current value, is transmitted to the abnormal monitoring system. The abnormal monitoring system compares the actual intersection current value with the theoretical intersection current lower limit. If the actual intersection current value is less than the theoretical intersection current lower limit, it is determined that there is residual coal in bucket B. The loading control system controls bucket B to lock the loading. The elevator driver must manually lift the downward bucket to the unloading position again to confirm that the residual coal is unloaded before normal coal loading can be resumed. If the actual intersection current value is not less than the theoretical intersection current lower limit, coal loading is normal.
[0061] Before loading the bucket B, the weighing sensor B transmits the weight of the material loaded in the quantitative bin B, that is, the actual amount of coal loaded in the bucket B, to the abnormal monitoring system, and the abnormal monitoring system calculates the theoretical lower limit of the intersection current, W s is the actual coal loading amount of bucket B. When bucket B is loading and ascending, bucket A is unloading and descending. When the lifting height of bucket A and bucket B is in the range of 370m-410m, the current value of the AC drive system motor, that is, the actual intersection current value, is transmitted to the abnormal monitoring system. The abnormal monitoring system compares the actual intersection current value with the theoretical intersection current lower limit. If the actual intersection current value is less than the theoretical intersection current lower limit, it is determined that there is residual coal in bucket A. The loading control system controls bucket A to lock the loading. The elevator driver must manually lift the downward bucket to the unloading position again to confirm that the residual coal is unloaded before normal coal loading can be resumed. If the actual intersection current value is not less than the theoretical intersection current lower limit, coal loading is normal.
[0062] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.
Claims
1. A method for monitoring load anomaly of a friction hoist, characterized in that: The following steps are involved: Step 1: Calculate the theoretical lower limit of the bucket intersection current I l , the calculation formula is: I l =A×W s ; Among them, A is the current anomaly coefficient, W s The actual amount of coal loaded in the upward skip; A is determined by the following formula: A=0.9×I a ; Among them, I a is the theoretical current value per ton of coal; Step 2: Compare the actual intersection current value with the theoretical intersection current lower limit value. If the actual intersection current value is less than the theoretical intersection current lower limit value, determine the remaining coal in the descending bucket. Step 3: Lock the downward skip for loading and manually lift the downward skip back to the unloading position. After confirming that the remaining coal has been unloaded, the downward skip resumes normal loading.
2. A method for monitoring load anomaly of a friction hoist as claimed in claim 1, characterized in that: The friction hoist includes a quantitative bin weighing system, an AC drive system and an abnormal monitoring system. The quantitative bin weighing system weighs the quantitative bin to obtain the actual coal loading amount of the upward skip and transmits the signal to the abnormal monitoring system. The AC drive system transmits the actual intersection current value of the skip to the abnormal monitoring system. The abnormal monitoring system calculates the theoretical intersection current lower limit value and determines whether there is residual coal in the downward skip.
3. A method for monitoring load anomaly of a friction hoist as claimed in claim 2, characterized in that: The friction hoist also includes a loading control system. After the abnormal monitoring system determines that there is residual coal in the descending skip, the loading control system controls the descending skip to lock the loading.
4. A method for monitoring load anomaly of a friction hoist as claimed in claim 1, characterized in that: The area where the skip lifting height is between 370m and 410m is the skip intersection area.
5. A method for monitoring load anomaly of a friction hoist as claimed in claim 3, characterized in that: The friction hoist also includes a timer electrically connected to the abnormal monitoring system. After the abnormal monitoring system determines that there is residual coal in the descending skip, the timer starts timing. After the timer finishes timing, the loading control system controls the descending skip to lock the loading.
6. A method for monitoring load anomaly of a friction hoist as claimed in claim 5, characterized in that: The alarm is electrically connected to the timer, and the alarm sounds after the timer finishes timing.
7. A method for monitoring load anomaly of a friction hoist as claimed in claim 6, characterized in that: The timer is set to two seconds.