Automatic control device for interlocking feeding and discharging of electronic scale

Abstract

The utility model relates to a feeding and discharging interlocking automatic control device for an electronic scale, and the device comprises a first position switch and a second position switch which are respectively used for detecting whether a feeding valve and a discharging valve are closed in place or not; the first position switch is connected with the first intermediate relay; the second position switch is connected with the second intermediate relay; the first intermediate relay is provided with a first normally open contact and a second normally open contact, the first normally open contact is connected in series between the power supply end and the first input end of the controller, and the second normally open contact is connected in series between the second output point of the electronic scale instrument controller and the discharge valve coil; the second intermediate relay is provided with a third normally open contact and a fourth normally open contact, the third normally open contact is connected in series between the power supply end and the second input end of the controller, and the fourth normally open contact is connected in series between the first output point of the electronic scale instrument controller and the feed valve coil; and the controller is connected with an electronic scale instrument controller. According to the utility model, the metering accuracy can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of material metering technology, and in particular to an automatic control device for interlocking feeding and discharging of electronic scales. Background Technology

[0002] In the three main processes of barley production line—main cleaning, feeding, and root removal—the most important metering and control equipment is the electronic scale. In all processes, controlling the amount of barley cleaned and the amount of barley fed directly affects the quality of the processed barley.

[0003] Conventional metering control methods utilize electronic scales. The principle involves a feeding cylinder that opens the feeding valve, allowing material to enter the scale's hopper by gravity. A load cell continuously monitors the weight change in the hopper. As material enters, the hopper's weight gradually increases; this change is captured by the sensor and converted into an electrical signal. The control system calculates the required feed rate in real time based on the weight change and compares it with a preset value. By adjusting the feeding device's speed, it ensures the actual feed rate matches the set value, achieving precise feeding control. Once the preset value is reached, the feeding cylinder closes the feeding valve, and the discharge cylinder opens the discharge valve to discharge the material. Once all material is discharged from the hopper, one hopper metering cycle is complete. This cycle repeats until the material level reaches the system's set value, at which point the operation stops.

[0004] However, with prolonged and intensive operation of the electronic scale, the feeding and discharging cylinders will gradually wear out, or insufficient air supply pressure may cause the cylinders to operate slowly. This leads to two possible malfunctions: 1. The feeding cylinder closes after a timeout. The instrument determines that the feeding valve is closed based on the time, but in reality, the feeding valve is not fully closed. If the discharging valve opens at this time, material will leak into the partially closed feeding valve, resulting in inaccurate measurement. 2. The discharging cylinder closes after a timeout. The instrument determines that the discharging valve is closed, but in reality, the discharging valve is not fully closed. If the feeding valve opens at this time, material will also be missed. Both of these situations will seriously affect the accuracy of measurement control, thereby affecting the quality of wheat. In addition, even when the electronic scale is operating normally, after the feeding or discharging valve is closed, the other valve cannot open immediately. It must wait for the delay time set by the electronic scale instrument to expire before it can open. This also affects the operating efficiency of the electronic scale, prolongs the feeding time, and thus slows down the production rhythm and reduces output. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an automatic control device for interlocking the feeding and discharging of electronic scales to ensure the accuracy of measurement.

[0006] The technical solution adopted by this utility model to solve its technical problem is: to provide an automatic control device for interlocking feeding and discharging of electronic scales, comprising:

[0007] The first position switch is used to detect whether the feed valve is closed in place.

[0008] The second position switch is used to detect whether the discharge valve is closed in place.

[0009] The first intermediate relay has one end connected to the power supply terminal via the first position switch, and the other end grounded.

[0010] The second intermediate relay has one end connected to the power supply terminal via the second position switch, and the other end grounded.

[0011] The first intermediate relay is equipped with a first normally open contact and a second normally open contact. The first normally open contact is connected in series between the power supply terminal and the first input terminal of the controller, and the second normally open contact is connected in series between the second output terminal of the electronic scale instrument controller and the discharge valve coil. The second intermediate relay is equipped with a third normally open contact and a fourth normally open contact. The third normally open contact is connected in series between the power supply terminal and the second input terminal of the controller, and the fourth normally open contact is connected in series between the first output terminal of the electronic scale instrument controller and the feed valve coil. The controller is connected to the electronic scale instrument controller. The feed valve coil is used to control the opening and closing of the feed valve, and the discharge valve coil is used to control the opening and closing of the discharge valve.

[0012] The first position switch is a magnetic switch.

[0013] The second position switch is a magnetic switch.

[0014] The controller is a PLC controller.

[0015] The electronic scale instrument controller is equipped with a Profibus-DP bus communication adapter. The controller is connected to the Profibus-DP bus communication adapter via the Profibus-DP bus to enable the controller to control the electronic scale instrument controller.

[0016] Beneficial effects

[0017] By adopting the above technical solution, this utility model has the following advantages and positive effects compared with the prior art: This utility model adds a closed position switch to the original electronic scale feed valve and discharge valve. Each of the two position switches is connected to control an intermediate relay. Each intermediate relay has two sets of contacts. One set feeds back the state of the valve reaching the closed position to the controller. The other set of contacts is connected in series with the solenoid coil circuit of the other valve. Through the design of the above control circuit, the feed valve and discharge valve can achieve stable opening and closing, and ensure that they never open at the same time. It also optimizes the drawback of excessively long closing time caused by relying solely on the time control of the electronic scale instrument controller, ensuring the accuracy of measurement and improving the efficiency of weighing. Attached Figure Description

[0018] Figure 1 This is an electrical schematic diagram of the electronic scale feeding and discharging interlock automatic control device according to an embodiment of this utility model;

[0019] Figure 2 This is a schematic diagram of the installation position of the position switch in an embodiment of this utility model. Detailed Implementation

[0020] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0021] The embodiments of this utility model relate to an automatic control device for interlocking the feeding and discharging of electronic scales, such as... Figure 1 As shown, it includes:

[0022] The first position switch B1 is used to detect whether the feed valve is fully closed; the second position switch B2 is used to detect whether the discharge valve is fully closed; the installation positions of the first position switch B1 and the second position switch are as follows: Figure 2 As shown;

[0023] The first intermediate relay K1 has one end connected to the power supply terminal via the first position switch B1, and the other end grounded; the second intermediate relay K2 has one end connected to the power supply terminal via the second position switch B2, and the other end grounded; the first intermediate relay K1 is equipped with a first normally open contact K1_1 and a second normally open contact K1_2. The first normally open contact K1_1 is connected in series between the power supply terminal and the first input terminal DI_1 of the controller, and the second normally open contact K1_2 is connected in series between the second output point Q2 of the electronic scale instrument controller and the discharge valve coil V. Between 2; the second intermediate relay K2 is equipped with a third normally open contact K2_1 and a fourth normally open contact K2_2. The third normally open contact K2_1 is connected in series between the power supply terminal and the second input terminal DI_2 of the controller. The fourth normally open contact K2_2 is connected in series between the first output point Q1 of the electronic scale instrument controller and the feed valve coil V1. The controller is connected to the electronic scale instrument controller. The feed valve coil V1 is used to control the opening and closing of the feed valve, and the discharge valve coil V2 is used to control the opening and closing of the discharge valve.

[0024] In this embodiment, both the first position switch B1 and the second position switch B2 can be magnetic switches, and the controller can be a PLC controller. In this embodiment, the electronic scale instrument controller can be configured with a Profibus-DP bus communication adapter. The controller is connected to the Profibus-DP bus communication adapter via the Profibus-DP bus to achieve control of the electronic scale instrument controller by the controller.

[0025] The working principle of the electronic scale feeding and discharging interlock automatic control device in this embodiment is explained below, taking the wheat processing industry as an example:

[0026] When the electronic scale starts working, both the feed valve and the discharge valve are initially closed. At this time, the coils of the first intermediate relay K1 and the second intermediate relay K2 are energized, so the first normally open contact K1_1, the second normally open contact K1_2, the third normally open contact K2_1, and the fourth normally open contact K2_2 are all closed. The PLC controller transmits the control command to open the feed valve to the electronic scale instrument controller via the Profibus-DP bus. After receiving the control command, the electronic scale instrument controller outputs a signal at its first output point Q1, energizing the feed valve coil V1 and causing the feed valve to open. At this time, the first position... When switch B1 is open, the coil of the first intermediate relay K1 is de-energized, causing the first normally open contact K1_1 and the second normally open contact K1_2 to open, thus disconnecting the connection between the discharge valve coil V2 and the second output point Q2 of the electronic scale controller. Once the weight of the malting material entering the hopper reaches the set value, the first output point Q1 of the electronic scale controller stops outputting, and the feed valve coil V1 is de-energized, causing the feed valve to close. When the feed valve is fully closed, the first position switch B1 closes, energizing the coil of the first intermediate relay K1. At this time, the first normally open contact K1_1 and the second normally open contact K1_2 close, and the discharge valve coil V2... 2. The connection between the second output point Q2 of the electronic scale instrument controller and the second output point Q2 is restored. At this time, the controller receives the signal that the feed valve is closed through the first input terminal DI_1, and then sends a control command to the electronic scale instrument controller to open the discharge valve. After receiving the command, the electronic scale instrument controller outputs a signal at its second output point Q2, energizing the discharge valve coil V2, causing the discharge valve to open. At the same time, the wheat processing material in the hopper is discharged, the second position switch B2 is disconnected, and the coil of the second relay relay K2 is de-energized, causing the third normally open contact K2_1 and the fourth normally open contact K2_2 to disconnect. The connection between the feed valve coil V1 and the electronic scale instrument controller is restored. The connection between the first output point Q1 of the device is cut off; after the wheat processing material in the hopper is discharged, the second output point Q2 of the electronic scale instrument controller stops outputting, the discharge valve coil V2 is de-energized, causing the discharge valve to close. When the discharge valve is closed, the second position switch B2 closes, energizing the coil of the second intermediate relay K2. At this time, the third normally open contact K2_1 and the fourth normally open contact K2_2 close, and the connection between the feed valve coil V1 and the first output point Q1 of the electronic scale instrument controller is restored. At this time, the controller receives the signal that the discharge valve is closed through the second input terminal DI_2, and the entire device returns to the initial state.

[0027] It is easy to see that this utility model adds a closed position switch to the original electronic scale's feed valve and discharge valve. Each of the two position switches is connected to control an intermediate relay. Each intermediate relay has two sets of contacts. One set feeds back the status of the cylinder reaching the closed position to the controller, and the other set of contacts is connected in series with the solenoid valve coil circuit of another cylinder. Through the design of the above control circuit, the feed cylinder and discharge cylinder can achieve stable opening and closing, and ensure that they never open at the same time. It also optimizes the drawback of excessively long closing time caused by relying solely on the time control of the electronic scale instrument controller, ensuring the accuracy of measurement and improving the efficiency of weighing.

Claims

1. An automatic control device for interlocking feeding and discharging of electronic scales, characterized in that, include: The first position switch is used to detect whether the feed valve is closed in place. The second position switch is used to detect whether the discharge valve is closed in place. The first intermediate relay has one end connected to the power supply terminal via the first position switch, and the other end grounded. The second intermediate relay has one end connected to the power supply terminal via the second position switch, and the other end grounded. The first intermediate relay is equipped with a first normally open contact and a second normally open contact. The first normally open contact is connected in series between the power supply terminal and the first input terminal of the controller, and the second normally open contact is connected in series between the second output terminal of the electronic scale instrument controller and the discharge valve coil. The second intermediate relay is equipped with a third normally open contact and a fourth normally open contact. The third normally open contact is connected in series between the power supply terminal and the second input terminal of the controller, and the fourth normally open contact is connected in series between the first output terminal of the electronic scale instrument controller and the feed valve coil. The controller is connected to the electronic scale instrument controller. The feed valve coil is used to control the opening and closing of the feed valve, and the discharge valve coil is used to control the opening and closing of the discharge valve.

2. The electronic scale feeding and discharging interlock automatic control device according to claim 1, characterized in that, The first position switch is a magnetic switch.

3. The electronic scale feeding and discharging interlock automatic control device according to claim 1, characterized in that, The second position switch is a magnetic switch.

4. The electronic scale feeding and discharging interlock automatic control device according to claim 1, characterized in that, The controller is a PLC controller.

5. The electronic scale feeding and discharging interlock automatic control device according to claim 1, characterized in that, The electronic scale instrument controller is equipped with a Profibus-DP bus communication adapter. The controller is connected to the Profibus-DP bus communication adapter via the Profibus-DP bus to enable the controller to control the electronic scale instrument controller.

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