CN108584354B - Device and method for detecting and positioning unqualified products of beat type flow production line - Google Patents
Device and method for detecting and positioning unqualified products of beat type flow production line Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
- B65G43/08—Control devices operated by article or material being fed, conveyed or discharged
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/74—Feeding, transfer, or discharging devices of particular kinds or types
- B65G47/82—Rotary or reciprocating members for direct action on articles or materials, e.g. pushers, rakes, shovels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
- B65G2203/04—Detection means
- B65G2203/042—Sensors
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Abstract
The invention discloses a device and a method for detecting and positioning unqualified products of a beat type flow production line. The method comprises the following steps: starting a production line; step two: measuring a beat type assembly line standard time sequence; step three: measuring the actual time sequence of the beat type assembly line; step four: determining the relation between the workpiece serial number detected by the detection device and the clamping serial number of the workpiece according to the standard time sequence and the actual time sequence; step five: and sending the clamping serial number to the pipeline control mechanism according to the clamping serial number of the workpiece and the detection result of the workpiece, and pushing the workpiece on the clamping position to a qualified product station or an unqualified product station by the pipeline control mechanism. The invention automatically and efficiently classifies qualified and unqualified products.
Description
Technical Field
The invention relates to a device and a method for detecting and positioning unqualified products of a beat type flow production line, belonging to the technical field of automatic control of flow production lines.
Background
A workpiece to be processed is placed on the equidistant screens on the beat type flow production line, and the flow production line moves at a fixed speed v at a time by the distance of n screens in a moving beat; in a static beat, the assembly line stops moving to wait for other processing procedures to be completed; the moving beat and the static beat of the rhythm type flow production line are alternately carried out.
The detection of n workpieces is finished at one static beat, which is unrealistic due to the limitation of the clamping distance, the volume of the detection device and the price of the detection device, and n detection devices are installed before n clamping positions. Therefore, a detection device is needed to finish the detection of n workpieces at a moving beat, the clamping serial numbers of unqualified workpieces are recorded, and the unqualified workpieces on the serial number clamping positions are pushed to an unqualified station at a static beat after the moving beat according to the unqualified workpiece clamping serial numbers.
However, the actual flow production line cannot guarantee that all the workpieces are placed on the n clamping positions, and some clamping positions may not have workpieces. Therefore, if only m (m < n) screens have workpieces placed, only m workpieces can be detected in one movement cycle. The computer has difficulty in determining which of the n screens the m workpieces correspond to. Therefore, after detecting the unqualified workpiece, the computer can only determine the serial number of the workpiece in m workpiece workpieces, and cannot determine the serial number of the workpiece on the assembly line clamping position.
Disclosure of Invention
In order to solve the existing problems, the invention discloses a device and a method for detecting and positioning unqualified products of a beat type flow production line, and the specific technical scheme is as follows:
the beat type device for detecting and positioning the unqualified products on the assembly line comprises an assembly line and an assembly line driving mechanism, wherein a mobile starting device is arranged in the assembly line driving mechanism, the mobile starting device is connected with a computer through a mobile beat starting signal line, the assembly line driving mechanism drives the assembly line to advance periodically at a constant speed, a plurality of clamping positions are arranged on the assembly line and used for placing workpieces, a detection device is arranged vertically above the assembly line and connected with the computer through a detection result signal line, the detection device is aligned with the workpieces on the clamping positions of the conveying belt, and when the workpieces on the clamping positions pass through the detection device, the detection device finishes the detection of the workpieces and transmits the serial numbers of the workpieces detected at the current beat and the detection results to the computer; the detection device is characterized in that a sensor is arranged beside the detection device, the sensor is connected with a computer through a sensor signal wire, when a workpiece passes through the detection device, the sensor is triggered, when the computer receives a sensor signal, the current time is recorded, and the time is also the time for the detection device to detect the workpiece.
And a qualified product station and an unqualified product station are arranged beside the production line.
The qualified product station and the unqualified product station are positioned on the same side or two sides of the production line or at the advancing tail end of the production line.
The detection and positioning method for the unqualified products of the rhythm type flow production line comprises the following operation steps:
the method comprises the following steps: starting a production line:
starting the assembly line, wherein the mobile starting device transmits a computer starting signal to the computer starting signal through a mobile beat starting signal line, and records the starting time of the mobile beat of the assembly line;
the assembly line is provided with n clamping positions, each clamping position is provided with a workpiece,
during the moving beat of the production line, the workpieces on the n screens sequentially pass through the detection device, the detection device sequentially detects the n workpieces and sequentially records the n workpieces as serial numbers 1,2, … and n, the detection result and the serial numbers are transmitted to the computer,
when a workpiece passes through the detection device, triggering the sensor, and recording the current time when the computer receives a sensor signal, wherein the time is also the time for detecting the workpiece by the detection device;
step two: determining a beat type assembly line standard time sequence:
step 21: placing workpieces in the n clamping positions;
step 22: the computer automatically records the time t of the start of the moving beat0And sequentially recording the time t of triggering the sensor by the workpiece on the n screens1，t2，…，tn-1，tn；
Step 23: will t1～tnMinus t0To obtain a sequence t1-t0，t2-t0，…，tn-1-t0，tn-t0And is recorded as: t is1，T2，…，TnReferred to as standard time series;
step three: determining the actual time sequence of the beat type assembly line:
step 31: m workpieces are placed on the n clamping positions, and m is less than or equal to n;
step 32: the computer automatically records the starting time s of the moving beat0And sequentially recording the time of triggering the sensor by the workpiece on the m screens as s1,s2,…,sm-1,sm；
Step 33: will s1～smSubtract s0Obtaining a sequence s1-s0,s2-s0,…,sm-1-s0,sm-s0And is recorded as: s1,S2,…,SmReferred to as the actual time series;
step four: determining the relation between the workpiece serial number detected by the detection device and the clamping serial number of the workpiece according to the standard time sequence and the actual time sequence;
step five: and sending the clamping serial number to the pipeline control mechanism according to the clamping serial number of the workpiece and the detection result of the workpiece, and pushing the workpiece on the clamping position to a qualified product station or an unqualified product station by the pipeline control mechanism.
The fourth step comprises the following specific steps:
step 41: for i 1 to m and j 1 to n, δ is calculatedij＝|Si-Tj|；
Step 42: for i 1 to m and j 1 to n, δ is determinedij<(Tn-T1)/[2(n-1)]If the inequality is true, the ith workpiece is determined to be positioned on the jth clamping position, and the clamping position serial number K corresponding to the workpiece serial number is calculatedi；
Step 43: if the detection device detects that the ith workpiece is unqualified, the computer compares the Kth workpiece with the number of the ith workpieces, and if the number of the ith workpieces is not qualified, the computer compares the number of the ith workpieces with the number of the ith workpiecesiThe work piece on each position is marked as unqualified, and a control signal is sent out to mark the KiAnd pushing the workpiece on each clamping position to an unqualified station.
The invention has the beneficial effects that:
the invention uses one detection device to detect the moving workpiece, thereby saving the cost of detection equipment and avoiding the difficulty that the positions of the adjacent workpieces of the assembly line cannot accommodate a plurality of detection equipment; the invention detects and determines the clamping serial number of the unqualified workpiece in the workpiece moving process, thereby conveniently sending a control signal to the clamping position where the unqualified workpiece is positioned and pushing the unqualified workpiece to an unqualified station.
Drawings
FIG. 1 is a view showing a connection state of 12 work-pieces each having one work-piece in a work line according to the present invention; FIG. 2 is a connection state diagram of the assembly line of the present invention with 12 positions, 2 nd, 3 rd, 5 th, 6 th, 8 th, 10 th, 11 th and 12 th positions on which the workpieces are placed, and the serial numbers of the workpieces are 1-8.
Detailed Description
The invention is further elucidated with reference to the drawings and the detailed description. It should be understood that the following detailed description is illustrative of the invention only and is not intended to limit the scope of the invention.
The device for detecting and positioning the unqualified products of the rhythm type flow production line comprises a flow line and a flow line driving mechanism, wherein a mobile starting device is arranged in the flow line driving mechanism, the mobile starting device is connected with a computer through a mobile rhythm starting signal line, the flow line driving mechanism drives the flow line to periodically advance at a constant speed, a plurality of clamping positions used for placing workpieces are arranged on the flow line, a detection device is arranged vertically above the flow line and is connected with the computer through a detection result signal line, the detection device is aligned with the workpieces on the clamping positions of a conveying belt, and when the workpieces on the clamping positions pass through the detection device, the detection device finishes the detection of the workpieces and transmits the serial numbers and the detection results of the workpieces detected at the current rhythm to the computer; the detection device is characterized in that a sensor is arranged beside the detection device, the sensor is connected with a computer through a sensor signal wire, when a workpiece passes through the detection device, the sensor is triggered, when the computer receives a sensor signal, the current time is recorded, and the time is also the time for the detection device to detect the workpiece.
And a qualified product station and an unqualified product station are arranged beside the production line.
The qualified product station and the unqualified product station are positioned on the same side or two sides of the production line or at the advancing tail end of the production line.
The detection and positioning method for the unqualified products of the rhythm type flow production line comprises the following operation steps:
the method comprises the following steps: starting a production line:
starting the assembly line, wherein the mobile starting device transmits a computer starting signal to the computer starting signal through a mobile beat starting signal line, and records the starting time of the mobile beat of the assembly line;
the assembly line is provided with n clamping positions, each clamping position is provided with a workpiece,
during the moving beat of the production line, the workpieces on the n screens sequentially pass through the detection device, the detection device sequentially detects the n workpieces and sequentially records the n workpieces as serial numbers 1,2, … and n, the detection result and the serial numbers are transmitted to the computer,
when a workpiece passes through the detection device, triggering the sensor, and recording the current time when the computer receives a sensor signal, wherein the time is also the time for detecting the workpiece by the detection device;
step two: determining a beat type assembly line standard time sequence:
step 21: placing workpieces in the n clamping positions;
step 22: the computer automatically records the time t of the start of the moving beat0And sequentially recording the time t of triggering the sensor by the workpiece on the n screens1，t2，…，tn-1，tn；
Step 23: will t1～tnMinus t0To obtain a sequence t1-t0，t2-t0，…，tn-1-t0，tn-t0And is recorded as: t is1，T2，…，TnReferred to as standard time series;
step three: determining the actual time sequence of the beat type assembly line:
step 31: m workpieces are placed on the n clamping positions, and m is less than or equal to n;
step 32: the computer automatically records the starting time s of the moving beat0And sequentially recording the time of triggering the sensor by the workpiece on the m screens as s1,s2,…,sm-1,sm；
Step 33: will s1～smSubtract s0Obtaining a sequence s1-s0,s2-s0,…,sm-1-s0,sm-s0And is recorded as: s1,S2,…,SmReferred to as the actual time series;
step four: determining the relation between the workpiece serial number detected by the detection device and the clamping serial number of the workpiece according to the standard time sequence and the actual time sequence;
step five: and sending the clamping serial number to the pipeline control mechanism according to the clamping serial number of the workpiece and the detection result of the workpiece, and pushing the workpiece on the clamping position to a qualified product station or an unqualified product station by the pipeline control mechanism.
The fourth step comprises the following specific steps:
step 41: for i 1 to m and j 1 to n, δ is calculatedij＝|Si-Tj|；
Step 42: for i 1 to m and j 1 to n, δ is determinedij<(Tn-T1)/[2(n-1)]If the inequality is true, the ith workpiece is determined to be positioned on the jth clamping position, and the clamping position serial number K corresponding to the workpiece serial number is calculatedi；
Step 43: if the detection device detects that the ith workpiece is unqualified, the computer compares the Kth workpiece with the number of the ith workpieces, and if the number of the ith workpieces is not qualified, the computer compares the number of the ith workpieces with the number of the ith workpiecesiThe work piece on each position is marked as unqualified, and a control signal is sent out to mark the KiAnd pushing the workpiece on each clamping position to an unqualified station.
The following illustrates the application of the invention:
the rhythm type production line is provided with 12 clamping positions, and each clamping position is provided with a workpiece. The assembly line moves 12 clamping distances in one moving beat.
First, a moving tempo starts, and a computer automatically records a time t at which the moving tempo starts0And sequentially recording the time t of triggering the sensor by the workpiece on the 12 screens1,t2,…,t11,t12As shown in table 1; computer will t1～t12Minus t0To obtain a sequence t1-t0,t2-t0,…,t11-t0,t12-t0When is standard timeThe sequence between: t is1,T2,…,T12As shown in table 2.
TABLE 1 moving tempo start time and time of workpiece passing sensor
TABLE 2 Standard time series
However, in actual production, it cannot be guaranteed that workpieces are placed on all 12 screens, and some screens may not have workpieces. Thus, only 8 workpieces may be placed in the 12 screens, as shown in FIG. 2. The computer automatically records the starting time s of the moving beat0And sequentially recording the time of triggering the sensors by the workpieces on 8 screens as s1,s2,…,s8As shown in table 3; computer will s1～s8Subtract s0Obtaining a sequence s1-s0,s2-s0,…,s8-s0I.e. the actual time series: s1,S2,…,S8As shown in table 4.
TABLE 3 moving tempo start time and time for 8 workpieces to pass the sensor
TABLE 4 actual time series
| S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 |
| 0.36 | 0.58 | 1.08 | 1.30 | 1.82 | 2.36 | 2.60 | 2.81 |
Calculating delta for i being 1-8 and j being 1-12ij＝|Si-TjAs shown in table 5; calculating the inequality deltaij<(Tn-T1)/[2(n-1)]If the inequality is true, the ith workpiece is determined to be positioned on the jth screens, and the screen serial number K corresponding to the workpiece serial number i from 1 to m is calculatedi. In Table 5, δ12δ23δ35δ46δ58δ6,10δ7,11δ8,12The value of (2) is less than 0.125, therefore, the 1 st to 8 th workpieces are respectively positioned on the 2 nd, 3 rd, 5 th, 6 th, 8 th, 10 th, 11 th and 12 th screens.
TABLE 5. calculation of δijThe obtained watch
For example, if the 4 th workpiece is detected to be unqualified by the detection device, the computer records the workpiece on the 6 th clamping position as unqualified, and sends out a control signal to push the workpiece on the 6 th clamping position to the unqualified station.
The technical means disclosed by the scheme of the invention are not limited to the technical means disclosed by the technical means, and the technical scheme also comprises the technical scheme formed by any combination of the technical characteristics.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (2)
1. The detection and positioning method for the unqualified products of the rhythm type flow production line is characterized by comprising the following operation steps of:
the method comprises the following steps: starting a production line:
starting the assembly line, wherein the mobile starting device transmits a computer starting signal to the computer starting signal through a mobile beat starting signal line, and records the starting time of the mobile beat of the assembly line;
the assembly line is provided with n clamping positions, each clamping position is provided with a workpiece,
during the moving beat of the production line, the workpieces on the n screens sequentially pass through the detection device, the detection device sequentially detects the n workpieces and sequentially records the n workpieces as serial numbers 1,2, … and n, the detection result and the serial numbers are transmitted to the computer,
when a workpiece passes through the detection device, triggering the sensor, and recording the current time when the computer receives a sensor signal, wherein the time is also the time for detecting the workpiece by the detection device;
step two: determining a beat type assembly line standard time sequence:
step 21: placing workpieces in the n clamping positions;
step 22: the moving rhythm is started, the computer automatically records the time t0 of the starting of the moving rhythm, and sequentially records the time t1, t2, …, tn-1, tn of the workpiece trigger sensors on the n screens;
step 23: subtracting t0 from t 1-tn to obtain the numerical sequences t1-t0, t2-t0, …, tn-1-t0 and tn-t0, which are recorded as: t1, T2, …, Tn, referred to as standard time series;
step three: determining the actual time sequence of the beat type assembly line:
step 31: m workpieces are placed on the n clamping positions, and m is less than or equal to n;
step 32: when the moving beat begins, the computer automatically records the starting time s0 of the moving beat, and records the time of triggering the sensors by the workpieces on the m screens as s1, s2, …, sm-1 and sm in sequence;
step 33: subtracting s0 from s 1-sm to obtain the numerical sequences s1-s0, s2-s0, …, sm-1-s0 and sm-s0, which are recorded as: s1, S2, …, Sm, referred to as actual time series;
step four: determining the relation between the workpiece serial number detected by the detection device and the clamping serial number of the workpiece according to the standard time sequence and the actual time sequence;
step five: and sending the clamping serial number to the pipeline control mechanism according to the clamping serial number of the workpiece and the detection result of the workpiece, and pushing the workpiece on the clamping position to a qualified product station or an unqualified product station by the pipeline control mechanism.
2. The method for detecting and positioning the unqualified products in the rhythm type flow production line according to claim 1, wherein the concrete steps of the fourth step are as follows:
step 41: calculating δ ij ═ Si-Tj | for i ═ 1 to m and j ═ 1 to n;
step 42: if the inequality is true, the ith workpiece is determined to be positioned on the jth screens, and the screen serial number Ki corresponding to the workpiece serial number is calculated;
step 43: if the detection device detects that the ith workpiece is unqualified, the computer records the workpiece on the Ki clamping position as unqualified, sends a control signal and pushes the workpiece on the Ki clamping position to an unqualified station.
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