CN108001996A - Material detection device and method - Google Patents

Abstract

The embodiment of the present invention provides a material detection device and method. The material detection device includes: a travel switch, a controller and a detection kit; the detection kit includes: a rotating shaft, a material detection plate and a rotating rod; Across the conveyor belt, the rotating shaft is rotatably connected to the mounting frame; the upper edge of the material detection plate is fixed on the rotating shaft, and there is a gap between the lower edge of the material detecting plate and the conveyor belt; one end of the rotating rod is fixed on the rotating shaft end; the travel switch is located within the swing range of the rotating rod; the controller is controlled by the output signal of the travel switch, and outputs a start signal to the rapping device. The invention controls the rapping device to vibrate the side wall of the silo when there is a lack of material on the conveyor belt of the belt conveyor, so that the material adhered to the side wall of the silo is discharged from the discharge port, and the belt is prevented from being damaged due to the accumulation of materials in the silo. The material shortage phenomenon occurs on the conveyor belt of the conveyor, which realizes the stable transmission of materials to the downstream production equipment.

Description

Material detection device and method

technical field

The invention relates to the technical field of automatic control, in particular to a material detection device and method.

Background technique

The silo is an important container-type equipment for storing materials in industrial production, and generally undertakes the material transportation function together with the belt conveyor. For powdery materials with high temperature, when they are piled up in the silo, it is easy to form a cavity at the discharge port or stick to the wall of the silo. The cavity will lead to no material at the initial moment of discharge, which will lead to poor discharge, or , the agglomeration at the outlet will reduce the cross-section of the discharge port, which will lead to a decrease in the discharge speed, or even the failure of discharge. Both the void and the agglomeration will reduce the amount of material falling from the silo to the belt conveyor. When transported by the belt conveyor, it will cause the belt conveyor downstream of the discharge port to lack material.

The positional relationship between silo 1, rapping device 2, belt conveyor 3 and metering scale 4 is shown in Figure 1. In the prior art, the metering scale is generally used to measure the amount of material discharged from the silo for production control. It can be used to judge the material shortage. The method is to use the weighing scale installed under the conveyor belt to detect the material weight on the conveyor belt. When the material weight is detected to be small, it is considered that the material shortage may be caused by the silo, and then the material shortage signal is sent to the control. System, the control system activates the rapping device on the silo to vibrate the material stuck to the inner wall of the silo to stabilize the amount of material on the belt conveyor.

However, due to the detection characteristics of the weighing scale, a relatively stable section is required, and the conveyor belt below the discharge port of the silo has to bear the weight of the material in the silo, and its idlers are arranged densely. Since the material has just fallen from the silo to the conveyor belt The loading time is not stable, so the general installation position of the metering scale is a certain distance from the outlet of the silo, so that there is a certain lag in the judgment of material shortage, and the startup of the vibration device will also lag behind, which often leads to a distance on the conveyor belt machine ( According to the installation characteristics of the weighing scale, generally about 2 meters in length), there will still be a lack of material. When the material shortage is serious, it will cause production fluctuations or the downstream production equipment cannot be stably controlled, which will affect the subsequent sections (such as the disc in the pelletizing process production line normal production of pelletizing machine).

Contents of the invention

In order to overcome the problems existing in the related technologies, the present invention provides a material detection device and method.

According to the first aspect of the embodiments of the present invention, there is provided a material detection device for detecting the material on the conveyor belt of the belt conveyor, the material is discharged from the silo, and the discharge port of the silo is on the conveyor belt The projection of is located on the conveyor belt, and a rapping device is provided on the silo, and the material detection device includes: a travel switch, a controller and a detection kit; the detection kit includes: a rotating shaft, a material detection plate and a rotating rod ;

The rotating shaft straddles the conveyor belt through the mounting frame, and there is a gap between the conveyor belt, and the rotating shaft is rotatably connected to the mounting frame;

The upper edge of the material detection plate is fixed on the rotating shaft, and the material detection plate is located above the conveyor belt, and there is an interval between the lower edge of the material detection plate and the conveyor belt, and the material detection plate When the plate swings, the rotating shaft is driven to rotate;

One end of the rotating rod is fixed on the end of the rotating shaft, and the rotating rod is driven to swing when the rotating shaft rotates;

The travel switch is located within the swing range of the rotating rod, and the travel switch is triggered when the rotating rod swings;

The input end of the controller is connected with the output end of the travel switch, the output end of the controller is connected with the rapping device, the controller is controlled by the output signal of the travel switch, The device outputs an activation signal.

Optionally, when the number of detection sets is at least two, the material detection plates in each detection set are arranged in sequence perpendicular to the material transmission direction.

Optionally, the distance between the projection ranges of every two adjacent material detection plates on the belt conveyor is at least a first preset distance.

Optionally, the interval between every two adjacent rotating rods is at least a second preset distance.

Optionally, at least two of the rotation axes are arranged parallel to each other along the vertical direction.

Optionally, each of the material detection boards corresponds to a projection area on the conveyor belt of the belt conveyor, and at least two of the projection areas are different.

Optionally, the axis of the rotating rod is not parallel to the axis of the rotating shaft.

Optionally, the axis of the rotating rod is perpendicular to the axis of the rotating shaft.

Optionally, the distance between the travel switch and the center of the rotating shaft is smaller than the distance between the other end of the rotating rod and the center of the rotating shaft.

According to the second aspect of the present invention, there is also provided a material detection method applied to any of the above material detection devices, the method comprising:

Detect whether the switch signal sent by the travel switch set at the preset position is received;

When the switch signal is received, a vibration control signal is sent to the rapping device, so that the rapping device vibrates to shake off the material on the inner wall of the hopper.

The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

In the present invention, a rotating shaft is arranged above the conveyor belt, and a material detection plate and a rotating rod are arranged on the rotating shaft. Since there is a gap between the lower edge of the material detection plate and the conveyor belt, the height of the material on the conveyor belt is greater than or equal to the gap. will drive the material detection plate to swing, so that the material detection plate drives the rotation shaft to rotate, and then drives the rotation rod to swing when the rotation shaft rotates. Since the travel switch is located within the swing range of the rotation rod, when the rotation rod swings The travel switch will be triggered, and the travel switch will send an output signal to the controller after being triggered, and then the controller is controlled by the output signal of the travel switch, and when the conveyor belt is short of material, it will output a start signal to the vibration device to make the vibration The beating device starts to vibrate the side wall of the silo, so that the material adhered to the side wall of the silo is discharged from the discharge port, avoiding the lack of material on the conveyor belt of the belt conveyor due to the accumulation of materials in the silo, and realizing the downstream Advanced production equipment can transmit materials stably.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a schematic diagram of the positional relationship between a silo, a belt conveyor, a rapping device and a metering scale in the prior art;

Fig. 2 is a top view of a material detection device according to an exemplary embodiment;

Fig. 3 is a left view of the structure of a detection kit, a travel switch and a conveyor belt according to an exemplary embodiment;

Fig. 4 is another structural top view of a detection kit, a travel switch and a conveyor belt according to an exemplary embodiment;

Fig. 5 is another left view showing the structure of the detection kit, travel switch and conveyor belt according to an exemplary embodiment;

Fig. 6 is a flowchart of a material detection method according to an exemplary embodiment.

Detailed ways

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.

In an embodiment of the present invention, a material detection device is provided, the material detection device is used to detect the material on the conveyor belt 3-1 of the belt conveyor 3, the material is discharged from the silo 1, and the material of the silo 1 is The projection of the discharge port 1-1 on the conveyor belt is located on the conveyor belt, and the rapping device 2 is arranged on the feed bin. See Figure 1 for the location distribution of feed bin 1, rapping device 2 and belt conveyor 3.

The material detection device includes: a travel switch 5, a controller (not shown in the figure) and a detection kit 6; the detection kit 6 includes: a rotating shaft 6-1, a material detection plate 6-2 and a rotating rod 6-3 .

Figure 2 is a top view of the material detection device when the number of detection kits is 1, the rotating shaft 6-1 straddles the conveyor belt 3-1 through the installation frame, and is arranged between the conveyor belt 3-1 There are gaps. In the embodiment of the present invention, the installation frame can be set on both sides of the conveyor belt 3-1, or it can be straddled on the conveyor belt 3-1. It can be set according to the actual situation. The rotating shaft 6-1 is set on the discharge Between the port 1-1 and the conveyor belt 3-1, and the position of the rotating shaft 6-1 should be set at the downstream of the discharge port 1-1 along the material transmission direction, and the distance between the rotating shaft 6-1 and the conveyor belt 3-1 It can be determined according to the length of the material detection plate 6-2, the rotating shaft 6-1 is rotatably connected to the mounting frame, and bearings and other rotating parts that are convenient for the rotating shaft 6-1 to rotate freely can be arranged on the rotating frame. 6-1 can be fixed in the rotating part.

As shown in Figure 2, the upper edge of the material detection plate 6-2 is fixed on the rotating shaft 6-1, and the material detection plate 6-1 is located above the conveyor belt 3-1, and the material detection plate 6-1 There is a gap between the lower edge of the plate 6-2 and the conveyor belt 3-1, and the material detection plate 6-2 drives the rotating shaft 6-1 to rotate when it swings.

In the embodiment of the present invention, the material detection board can be in the shape of a rectangular plate, and the upper edge of the material detection board can refer to the upper edge of the material detection board when it is installed, and the upper edge of the material detection board can be connected, clamped, etc. The method is fixed on the rotating shaft; in order to facilitate the material on the conveyor belt to drive the lower edge of the material detection plate to swing along the direction of material transmission when the material on the conveyor belt reaches a certain height, there should be a gap between the lower edge of the material detection plate and the conveyor belt. Among them, since the height of the material on the conveyor belt is generally 8cm to 15cm, so in the embodiment of the present invention, the vertical distance between the lower edge of the material detection plate and the conveyor belt should be less than or equal to 8cm; since the material detection plate is fixed on the rotating shaft , so when the material detection plate is driven by the material to swing, it will drive the rotating shaft to rotate along the axis.

One end of the rotating rod is fixed on the end of the rotating shaft, and the rotating rod is driven to swing when the rotating shaft rotates.

In the embodiment of the present invention, the rotating rod can be rod-shaped, and one end of the rotating rod is fixed on the end of the rotating shaft. In practical applications, the rotating rod can be fixed on the end face of the rotating shaft, or on the end On the side wall, it is not limited in the embodiment of the present invention. The fixing here can refer to fixing by a connecting piece, or fixing by clamping. Since the rotating rod is fixed on the rotating shaft, the rotating rod will not be connected with the rotating shaft. The shafts rotate relative to each other, so when the rotating shaft rotates, it will drive the rotating rod to swing.

As shown in Figure 3, in practical applications, when the material detection board is not affected by the supporting force of the material, the rotating rod can naturally sag along the vertical direction; when the material detecting board is affected by the supporting force of the material, it is assumed that the rotating rod swings The angle between the rotating rod and the material detection plate is α, when the rotating rod is perpendicular to the material detection plate, the angle between the rotating rod and the horizontal direction is also α; when the rotating rod is not perpendicular to the material detection plate, the angle between the rotating rod and the horizontal direction can also be α .

The travel switch is located within the swing range of the rotating rod, and the travel switch is triggered when the rotating rod swings.

The limit switch can refer to the electronic device in the prior art that uses the collision of the production mechanical moving parts to make the contact move to realize the connection or disconnection of the control circuit. In practical applications, the setting position of the travel switch should be located on the swing track of the rotating rod. The travel switch can be fixed on the support frame used to install the rotating shaft, or it can be set on other fixed plates parallel to the swing plane of the rotating rod. .

In the embodiment of the present invention, in order to enable the rotation lever to trigger the travel switch when it swings, the distance between the travel switch and the axis center of the rotation shaft should be smaller than the distance from the other end of the rotation rod away from the rotation shaft The distance between the centers of the rotating shafts. Moreover, the axis of the rotating rod should not be parallel to the axis of the rotating shaft. In a preferred embodiment of the present invention, the axis of the rotating rod should be perpendicular to the axis of the rotating shaft.

The input end of the controller is connected with the output end of the travel switch, the output end of the controller is connected with the rapping device, the controller is controlled by the output signal of the travel switch, The device outputs an activation signal.

In the embodiment of the present invention, the controller can refer to a processor, a single-chip microcomputer, a DSP or a relay interlocking device, etc. After the controller receives the output signal of the travel switch, it will automatically output a start signal to the rapping device according to the internal program, and the controller It can be connected with the travel switch and the rapping device through wired or wireless, so the controller can be set at the material testing site or at a location far away from the material testing site, which can be set according to actual needs The setting position of the rapping device can refer to Figure 1. It is set on the side wall of the silo. After receiving the start signal, the rapping device can automatically start the rapping action, so that the materials adhered to the side wall of the silo fall to the on the conveyor belt.

In the embodiment of the present invention, the number of the detection kits can be at least two, so that the material detection device will include at least two rotating shafts, at least two material detection plates, and at least two rotating rods, as shown in Figure 4 As shown in Figure 5, for the case where the number of detection kits is 3, the three rotating shafts are respectively the rotating shaft 6-1A, the rotating shaft 6-1B and the rotating shaft 6-1C, and the three material detection plates are respectively Material detection board 6-2A, material detection board 6-2B and material detection board 6-2C, the three rotating rods are respectively rotating rod 6-3A, rotating rod 6-3B and rotating rod 6-3C, as shown in Fig. 4 and Fig. 5 The reason why the rotation lever does not touch the limit switch is that the current material detection plate may be swinging under the support force of the material.

In order to prevent at least two material detection boards from interfering with each other when swinging, at least two material detection boards should be parallel to each other or on the same plane, and in order to facilitate detection of materials on the conveyor belt, each of the detection kits The material detection boards are arranged in sequence perpendicular to the direction of material transmission, each of the material detection boards corresponds to a projection area on the conveyor belt of the belt conveyor, at least two of the projection areas are different, and every two adjacent The distance between the projected ranges of the material detection board on the belt conveyor is at least a first preset distance, the first preset distance can be 1 cm, 2 cm, etc., and, in order to make the rotating rod not swing interfere with each other, at least two rotating rods should be parallel to each other, and the interval between every two adjacent rotating rods is at least a second preset distance, and the distance between every two adjacent rotating rods can refer to The distance of the rotating rod on the rotating shaft can also refer to the shortest distance between two adjacent rotating rods; in order to make the rotating shaft rotate along the axis without interfering with each other, at least two of the rotating shafts should be vertically directions parallel to each other.

In practical applications, the number of detection kits is generally 2 to 3 sets. When the number of detection kits is too large, the width of the material detection board will be small, which is not economical. If there is material on one side and lack of material on the other side, there will be no wavy material or no material. Therefore, it is generally sufficient to set up three material detection boards on the left, middle and right. As shown in Figure 4, each material detection board set detects Parts are responsible for the lack of material detection of an area. When there is a lack of material in the left area of the conveyor belt, the material detection plate 6-2C falls to a vertical state, and the rotating rod 6-3C rotates upwards under the drive of the rotating shaft 6-1C and touches the travel switch 5, sending out a material shortage signal; similarly to the conveyor belt 3 -1 When there is a lack of material in the middle and right areas, the material detection boards 6-2B and 6-2A in the middle and right will also have the same action, and each set of detection kits will act independently to expand the range of material shortage detection. When there are two material detection boards, if any one detects a material shortage signal, it will output a material shortage signal.

Since the detection board is in contact with the material for a long time, the material detection board is a vulnerable part and needs to be replaced regularly when worn to a certain extent. Generally, as long as the distance between the lower edge of the material detection board and the belt conveyor is greater than the actual height of the material, the detection board can be propped up , you don’t need to replace it.

As shown in FIG. 6, in another embodiment of the present invention, a material detection method is also provided, which is applied to the material detection device provided in any of the aforementioned device embodiments, and the method can be executed in the controller, The material detection method may include the following steps.

In step S101, it is detected whether a switch signal sent by a travel switch set at a preset position is received.

When the switch signal is received, in step S102, a vibration control signal is sent to the rapping device, so that the rapping device vibrates to shake off the material on the inner wall of the silo.

Other embodiments of the invention will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present invention, these modifications, uses or adaptations follow the general principles of the present invention and include common knowledge or conventional technical means in the technical field not disclosed in the present invention . The specification and examples are to be considered exemplary only, with the true scope and spirit of the invention indicated by the appended claims.

It should be understood that the present invention is not limited to the precise constructions which have been described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (10)

1. A material detection device, characterized in that, it is used to detect the material on the conveyor belt of the belt conveyor, the material is discharged from the silo, and the projection of the discharge port of the silo on the conveyor belt is located at the On the conveyor belt, the hopper is provided with a rapping device, and the material detection device includes: a travel switch, a controller and a detection kit; the detection kit includes: a rotating shaft, a material detection plate and a rotating rod; The rotating shaft straddles the conveyor belt through the mounting frame, and there is a gap between the conveyor belt, and the rotating shaft is rotatably connected to the mounting frame; The upper edge of the material detection plate is fixed on the rotating shaft, and the material detection plate is located above the conveyor belt, and there is an interval between the lower edge of the material detection plate and the conveyor belt, and the material detection plate When the plate swings, the rotating shaft is driven to rotate; One end of the rotating rod is fixed on the end of the rotating shaft, and the rotating rod is driven to swing when the rotating shaft rotates; The travel switch is located within the swing range of the rotating rod, and the travel switch is triggered when the rotating rod swings; The input end of the controller is connected with the output end of the travel switch, the output end of the controller is connected with the rapping device, the controller is controlled by the output signal of the travel switch, The device outputs an activation signal. 2 . The material detection device according to claim 1 , wherein when the number of the detection sets is at least two, the material detection plates in each of the detection sets are arranged in order perpendicular to the material transmission direction. 3 . 3 . The material detection device according to claim 2 , wherein the distance between the projection ranges of every two adjacent material detection boards on the belt conveyor is at least a first preset distance. 4 . 4. The material detection device according to claim 3, wherein the interval between every two adjacent rotating rods is at least a second preset distance. 5 . The material detection device according to claim 4 , wherein at least two of the rotating shafts are arranged parallel to each other along the vertical direction. 6 . 6 . The material detection device according to claim 5 , wherein each of the material detection boards corresponds to a projection area on the conveyor belt of the belt conveyor, and at least two of the projection areas are different. 7. The material detection device according to any one of claims 1 to 6, wherein the axis of the rotating rod is not parallel to the axis of the rotating shaft. 8. The material detection device according to claim 7, wherein the axis of the rotating rod is perpendicular to the axis of the rotating shaft. 9. The material detection device according to claim 1, wherein the distance between the travel switch and the axis of the rotating shaft is smaller than the distance between the other end of the rotating rod and the axis of the rotating shaft. distance between. 10. A material detection method, characterized in that it is applied to the material detection device according to any one of claims 1 to 9, said method comprising: Detect whether the switch signal sent by the travel switch set at the preset position is received; When the switch signal is received, a vibration control signal is sent to the rapping device, so that the rapping device vibrates to shake off the material on the inner wall of the hopper.