High-precision automatic weighing device for special powder

Abstract

The utility model discloses a high-precision automatic weighing device for special powder, which comprises a rack, a weighing mechanism, a PLC (programmable logic controller) control system and a feeding container, the feeding container is arranged in an upper area inside the rack and is provided with two discharge ports, and the two discharge ports are communicated with the PLC control system. A first conveying mechanism and a second conveying mechanism are arranged below two discharging ports of the feeding container respectively and move in opposite directions, and the weighing mechanism is arranged below the position between the first conveying mechanism and the second conveying mechanism. The PLC control system is electrically connected with the weighing mechanism, the first conveying mechanism and the second conveying mechanism. The first conveying mechanism and the second conveying mechanism each comprise a conveying belt, a driving motor and a roller shaft set. According to the utility model, the high-precision automatic weighing of special powder is realized, the weight of powder needing to be weighed can be accurately controlled by carrying out coarse adjustment and fine adjustment on the weight of one-time feeding, and the weighing precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of special powder weighing tools, in particular to a high-precision automatic weighing device for special powder. Background Art

[0002] In the production process of synthetic diamond parts, it is necessary to batch a variety of different materials to obtain powder materials with a certain ratio. The weighing accuracy of the batching process will directly affect whether the physical properties of the material are qualified. The batching accuracy of key components is 0.1g. Therefore, in the production process of weighing materials, ensuring accurate material ratio is of great significance for the smooth completion of the production process and the precise control of product quality.

[0003] However, at present, most production plants still use manual weighing for material batching, which has the defects of inaccurate batching and low efficiency, and cannot meet the high-precision requirements of weighing a single material. With the development of weighing tool technology, although there are devices on the market that use automatic control technology for weighing, their accuracy cannot meet the needs of special powder weighing. Therefore, it is necessary to study a high-precision automatic weighing device suitable for special powders.

[0004] The Chinese utility model patent with announcement number CN209166606U discloses a high-precision pre-feeding belt scale, including a frame and a conveyor belt. A high-precision weighing sensor is arranged on the outside of the conveyor belt, and a speed sensor is arranged on one side of the high-precision weighing sensor. The arrangement of the high-precision weighing sensor and the speed sensor can detect the weight and speed of the material with high precision. The drive motor inside the frame can drive the conveyor belt to move, and the frequency converter electrically connected to the drive motor can adjust the speed of the conveyor belt. However, simply by setting a high-precision weighing sensor on the conveyor belt, the measurement accuracy cannot be improved from the measurement method. Its actual accuracy depends more on the accuracy of the high-precision weighing sensor rather than the belt scale itself. Therefore, the solution to improve the weighing measurement accuracy of special powders cannot be limited to improving the accuracy of the scale or the weighing sensor, but also needs to be combined with other technical means to improve the accuracy. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art, improve the weighing accuracy of special powders, realize automatic weighing, and provide a high-precision automatic weighing device for special powders.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A high-precision automatic weighing device for special powders comprises a frame, a weighing mechanism and a PLC control system, and also comprises a feeding container, wherein the feeding container is arranged in the upper area inside the frame, the feeding container is provided with two discharge ports, a first conveying mechanism and a second conveying mechanism are respectively arranged below the two discharge ports of the feeding container, the first conveying mechanism and the second conveying mechanism move towards each other, the weighing mechanism is arranged at a lower position between the first conveying mechanism and the second conveying mechanism, and the PLC control system is electrically connected to the weighing mechanism, the first conveying mechanism and the second conveying mechanism respectively.

[0008] The utility model realizes high-precision automatic weighing of special powders. By arranging a first conveying mechanism and a second conveying mechanism, the weight of a one-time feeding is respectively roughly adjusted and finely adjusted, so that the weight of the powder material to be weighed can be accurately controlled to prevent the one-time excessive feeding from exceeding the set weight when the set weight is about to be reached. The weighing mechanism and the conveying mechanism are controlled by a PLC control system to realize automatic weighing, save manpower and improve accuracy.

[0009] Preferably, the first conveying mechanism includes a first conveyor belt, a first drive motor and a first roller group, the first conveyor belt is sleeved on the first roller group, and the output shaft of the first drive motor is connected to the main roller of the first roller group; the second conveying mechanism includes a second conveyor belt, a second drive motor and a second roller group, the second conveyor belt is sleeved on the second roller group, and the output shaft of the second drive motor is connected to the main roller of the second roller group, and the PLC control system is electrically connected to the first drive motor and the second drive motor respectively.

[0010] Preferably, it further comprises a first frequency converter and a second frequency converter, the PLC control system is electrically connected to the first frequency converter and the second frequency converter respectively, and the first frequency converter and the second frequency converter are also electrically connected to the first drive motor and the second drive motor respectively.

[0011] Preferably, a vibration motor is provided on the side of the feeding container, and the PLC control system is electrically connected to the vibration motor. The feeding container is reciprocated by the vibration action of the vibration motor, and all the materials can fall onto the conveying mechanism to prevent the discharge port from being blocked, thereby making the weighing and feeding of materials simpler and faster.

[0012] In order to more intelligently control the opening of the first conveying mechanism and the second conveying mechanism, a photoelectric sensor switch is provided above the first conveying mechanism and the second conveying mechanism, and the photoelectric sensor switch is connected to the PLC control system. The photoelectric sensor switch senses the material falling on the first conveying mechanism and the second conveying mechanism, and feeds back to the PLC control system. The first conveying mechanism and the second conveying mechanism can start working immediately when the material falls, reducing the waiting time for the material.

[0013] In order to facilitate weighing, the weighing mechanism includes a weighing tray and a weighing instrument. The weighing instrument is arranged at the lower end of the weighing tray and is electrically connected to the PLC control system.

[0014] In order to realize human-machine interaction and operator control of the weighing device, the PLC control system includes a control panel and a controller, the control panel and the controller are electrically connected, and the controller is electrically connected to the weighing mechanism, the first conveying mechanism, and the second conveying mechanism respectively.

[0015] Preferably, it further comprises a storage bin, which is arranged above the feeding container, and the storage bin is provided with one, two or more discharge ports.

[0016] Preferably, the feeding container comprises a first feeding hopper and a second feeding hopper, and the first feeding hopper and the second feeding hopper are both provided with a discharge port.

[0017] In order to facilitate feeding, a shell is arranged outside the frame, a feeding window is opened on the upper part of the shell, a cover is arranged outside the feeding window, and the cover is movably connected to the shell. By closing the cover after feeding, the material can be isolated from the external environment to prevent pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is described in further detail below in conjunction with the accompanying drawings.

[0019] Figure 1 is a front structural schematic diagram of Example 1;

[0020] Figure 2 is a schematic diagram of the side structure of Example 1;

[0021] Figure 3 It is a principle block diagram of Example 1;

[0022] Figure 4 is a schematic diagram of the side structure of Example 2;

[0023] Figure 5 This is a principle block diagram of Example 2.

[0024] Explanation of the reference numerals: 1-frame; 2-storage bin; 3-first hopper; 4-second hopper; 501-first conveyor belt; 502-first drive motor; 503-first roller group; 601-second conveyor belt; 602-second drive motor; 603-second roller group; 7-weighing tray; 8-weighing instrument; 9-vibration motor; 10-housing; 11-cover; 12-support plate; 13-base; 14-PLC control system; 1401-control panel; 1402-controller; 15-photoelectric sensor switch; 16-first frequency converter; 17-second frequency converter. DETAILED DESCRIPTION

[0025] Example 1

[0026] like Figure 1-3 As shown, the utility model provides a high-precision automatic weighing device for special powders, including a frame 1, a weighing mechanism and a PLC control system 14, and also includes a feeding container and a storage bin 2. The feeding container is arranged in the upper area inside the frame 1, and the storage bin 2 is arranged above the feeding container. The storage bin 2 is provided with one, two or more discharge ports. In this embodiment, the storage bin 2 is provided with two discharge ports, and the feeding container includes a first feeding hopper 3 and a second feeding hopper 4, and the first feeding hopper 3 and the second feeding hopper 4 are each provided with a discharge port. In this embodiment, the first feeding hopper 3 and the second feeding hopper 4 are both fixed to the frame 1 by a support plate 12. A first conveying mechanism and a second conveying mechanism are respectively arranged below the discharge ports of the first feeding hopper 3 and the second feeding hopper 4, and the first conveying mechanism and the second conveying mechanism move toward each other, and the weighing mechanism is arranged at a lower position between the first conveying mechanism and the second conveying mechanism. In order to facilitate weighing, the weighing mechanism includes a weighing tray 7 and a weighing instrument 8, the weighing instrument 8 is arranged at the lower end of the weighing tray 7, and a base 13 is also arranged at the bottom of the weighing instrument 8 to keep the weighing instrument 8 stable. In order to further improve the accuracy, the weighing instrument 8 can use a high-precision electronic scale. In order to realize human-computer interaction and operator control of the weighing device, the PLC control system 14 includes a control panel 1401 and a controller 1402, the control panel 1401 and the controller 1402 are electrically connected, and the controller 1402 is electrically connected to the weighing instrument 8, the first conveying mechanism, and the second conveying mechanism respectively.

[0027] In this embodiment, the first conveying mechanism includes a first conveyor belt 501, a first drive motor 502 and a first roller group 503, the first conveyor belt 501 is sleeved on the first roller group 503, and the output shaft of the first drive motor 502 is connected to the main roller shaft of the first roller group 503; the second conveying mechanism includes a second conveyor belt 601, a second drive motor 602 and a second roller group 603, the second conveyor belt 601 is sleeved on the second roller group 603, and the output shaft of the second drive motor 602 is connected to the main roller shaft of the second roller group 603, and the controller 1402 of the PLC control system 14 is electrically connected to the first drive motor 502 and the second drive motor 602 respectively.

[0028] In this embodiment, a vibration motor 9 is provided on the side of the first feeding hopper 3 and the second feeding hopper 4 of the feeding container, and the controller 1402 of the PLC control system 14 is electrically connected to the vibration motor 9. The feeding container is reciprocated by the vibration action of the vibration motor 9, and the powder can all fall into the conveying mechanism to prevent the discharge port from being blocked, thereby making the weighing and feeding of materials simpler and faster.

[0029] In order to more intelligently control the opening of the first conveying mechanism and the second conveying mechanism, a photoelectric sensor switch 15 is provided above the first conveying mechanism and the second conveying mechanism, and the photoelectric sensor switch 15 is connected to the controller 1402 of the PLC control system 14. The photoelectric sensor switch 15 senses the powder material falling on the first conveying mechanism and the second conveying mechanism, and feeds back to the controller 1402 of the PLC control system 14. The first conveying mechanism and the second conveying mechanism can start working immediately when the powder material falls, thereby reducing the waiting time for the powder material.

[0030] In order to facilitate loading, a shell 10 is provided outside the frame 1, a loading window is provided on the upper part of the shell 10, a cover plate 11 is provided outside the loading window, and the cover plate 11 is movably connected to the shell 10. The shell 10 is made of stainless steel to provide protection for the inside of the device. The staff can add materials to the storage bin 2 through the loading window, and by closing the cover plate 11 after adding materials, the powder can be isolated from the external environment to prevent contamination.

[0031] When the weighing device in this embodiment is used, firstly, the power is turned on, the required powder weight is set on the control panel 1401, and the speed of the first drive motor 502 is manually set to be higher than the speed of the second drive motor 602. The cover plate 11 is opened, a certain amount of powder is manually poured into the storage bin 2, the weighing tray 7 is placed in the designated position, and the switch of the PLC control system 14 is turned on. The photoelectric sensor switch 15 detects that the powder falls on the first conveyor belt 501 and the second conveyor belt 601, and the controller 1402 controls the first drive motor 502 and the second drive motor 602 to start rotating. The first conveyor belt 501 and the second conveyor belt 601 start rotating under the drive of the first drive motor 502 and the second drive motor 602 respectively, and at the same time, the two vibration motors 9 reciprocately knock the feeding hopper so that the powder in the feeding hopper can all fall on the first conveyor belt 501 and the second conveyor belt 601. The first conveyor belt 501 and the second conveyor belt 601 move toward each other to transport the powder to the weighing tray of the weighing mechanism. When the controller 1402 detects that the measured value of the weighing mechanism is close to the required powder weight, the controller 1402 controls the first conveyor belt 501 to shut down, and the second conveyor belt 601 continues to rotate to add material until the set value is reached to avoid too much or too little material being added.

[0032] The utility model realizes high-precision automatic weighing of special powders. By setting different speeds for the first conveying mechanism and the second conveying mechanism, the weight of the one-time feeding is roughly adjusted and finely adjusted respectively, so that the weight of the powder to be weighed can be accurately controlled to prevent excessive one-time feeding from exceeding the set weight when the set weight is about to be reached; the weighing mechanism and the conveying mechanism are controlled by the PLC control system 14, so as to realize automatic weighing, save manpower and improve accuracy; the controller 1402 timely closes the conveying mechanism with a higher speed, and the powder is slowly conveyed to the weighing tray 7 by the conveying mechanism with a lower speed, so as to control the weight of the powder added last, avoid excessive or insufficient feeding, and improve weighing accuracy.

[0033] Example 2

[0034] As another preferred embodiment, the difference from the above embodiment 1 is that it further includes a first frequency converter 16 and a second frequency converter 17. Figure 4 , 5 As shown, the first frequency converter 16 and the second frequency converter 17 are arranged on the frame 1, and the PLC control system 14 is electrically connected to the first frequency converter 16 and the second frequency converter 17 respectively, and the first frequency converter 16 and the second frequency converter 17 are also electrically connected to the first drive motor 502 and the second drive motor 602 respectively. Different speeds are set in advance for the first drive motor 502 and the second drive motor 602 by the first frequency converter 16 and the second frequency converter 17, and the speeds of the first drive motor 502 and the second drive motor 602 are controlled from fast to slow, instead of manually presetting the rotation speed, thereby improving the degree of automation.

[0035] When the weighing device in this embodiment is used, firstly, the power is turned on, and the required powder weight is set on the control panel 1401. The cover plate 11 is opened, and a certain amount of powder is manually poured into the storage bin 2, and the weighing tray 7 is placed in the designated position, and the switch of the PLC control system 14 is turned on. The photoelectric sensor switch 15 detects that the powder falls on the first conveyor belt 501 and the second conveyor belt 601, and the controller 1402 controls the first frequency converter 16 and the second frequency converter 17 to output different rotation frequencies. After receiving the rotation frequency, the first drive motor 502 and the second drive motor 602 start to rotate, and the first conveyor belt 501 and the second conveyor belt 601 start to rotate under the drive of the first drive motor 502 and the second drive motor 602 respectively. At the same time, the two vibration motors 9 reciprocately knock the feeding hopper, so that the powder in the feeding hopper can all fall on the first conveyor belt 501 and the second conveyor belt 601. The first conveyor belt 501 and the second conveyor belt 601 move toward each other to transport the powder to the weighing tray of the weighing mechanism. When the controller 1402 detects that the measured value of the weighing mechanism is close to the required powder weight, the controller 1402 controls the rotation speed of the first frequency converter 16 and the second frequency converter 17 to slow down, and the first conveyor belt 501 and the second conveyor belt 601 are slowly conveyed until the set value is reached to avoid excessive or insufficient material discharge.

[0036] The utility model realizes high-precision automatic weighing of special powders. By setting different speeds for the first conveying mechanism and the second conveying mechanism, the weight of the one-time feeding is roughly adjusted and finely adjusted respectively, so that the weight of the powder to be weighed can be accurately controlled to prevent excessive one-time feeding from exceeding the set weight when the set weight is about to be reached; the weighing mechanism and the conveying mechanism are controlled by the PLC control system 14, so as to realize automatic weighing, save manpower and improve accuracy; the speeds of the first drive motor 502 and the second drive motor 602 are adjusted in time by the first frequency converter 16 and the second frequency converter 17 to control the weight of the powder added last, avoid excessive or insufficient feeding, and improve weighing accuracy.

[0037] Example 3

[0038] As another preferred embodiment, the difference from the above embodiment 1 is that, in order to save costs, the feeding container is configured as a feeding hopper with two discharge ports. The storage bin 2 is provided with one discharge port, which is located above the feeding container.

[0039] Example 4

[0040] As another preferred embodiment, the difference from the above embodiment 1 is that, in order to save costs, the feeding container is set as a feeding hopper and has two discharge ports. The storage bin 2 is provided with multiple discharge ports, which are placed above the feeding container. By providing multiple discharge ports, the feeding speed is increased, and rapid feeding is achieved.

[0041] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined by the claims.

Claims

1. A high-precision automatic weighing device for special powders, comprising a frame, a weighing mechanism and a PLC control system, characterized in that: It also includes a feeding container, which is arranged in the upper area inside the frame, and the feeding container is provided with two discharge ports. A first conveying mechanism and a second conveying mechanism are respectively arranged below the two discharge ports of the feeding container, and the first conveying mechanism and the second conveying mechanism move toward each other. The weighing mechanism is arranged at a lower position between the first conveying mechanism and the second conveying mechanism, and the PLC control system is electrically connected to the weighing mechanism, the first conveying mechanism, and the second conveying mechanism respectively.

2. The high-precision automatic weighing device for special powders according to claim 1, characterized in that: The first conveying mechanism includes a first conveyor belt, a first drive motor and a first roller group, the first conveyor belt is sleeved on the first roller group, and the output shaft of the first drive motor is connected to the main roller of the first roller group; the second conveying mechanism includes a second conveyor belt, a second drive motor and a second roller group, the second conveyor belt is sleeved on the second roller group, and the output shaft of the second drive motor is connected to the main roller of the second roller group, and the PLC control system is electrically connected to the first drive motor and the second drive motor respectively.

3. The high-precision automatic weighing device for special powders according to claim 2, characterized in that: It also includes a first frequency converter and a second frequency converter. The PLC control system is electrically connected to the first frequency converter and the second frequency converter respectively. The first frequency converter and the second frequency converter are also electrically connected to the first drive motor and the second drive motor respectively.

4. The high-precision automatic weighing device for special powders according to claim 1, characterized in that: A vibration motor is arranged on the side of the feeding container, and the PLC control system is electrically connected to the vibration motor.

5. The high-precision automatic weighing device for special powders according to claim 1, characterized in that: A photoelectric sensor switch is provided above the first conveying mechanism and the second conveying mechanism, and the photoelectric sensor switch is connected to a PLC control system.

6. The high-precision automatic weighing device for special powders according to claim 1, characterized in that: The weighing mechanism comprises a weighing tray and a weighing instrument. The weighing instrument is arranged at the lower end of the weighing tray and is electrically connected to a PLC control system.

7. The high-precision automatic weighing device for special powders according to claim 1, characterized in that: The PLC control system comprises a control panel and a controller, wherein the control panel and the controller are electrically connected, and the controller is electrically connected to the weighing mechanism, the first conveying mechanism, and the second conveying mechanism respectively.

8. The high-precision automatic weighing device for special powders according to claim 1, characterized in that: It also includes a storage bin, which is arranged above the feeding container and has one, two or more discharge ports.

9. The high-precision automatic weighing device for special powders according to claim 1, characterized in that: The feeding container comprises a first feeding hopper and a second feeding hopper, and each of the first feeding hopper and the second feeding hopper is provided with a discharge port.

10. The high-precision automatic weighing device for special powders according to claim 1, characterized in that: A shell is arranged outside the frame, a feeding window is opened on the upper part of the shell, a cover plate is arranged outside the feeding window, and the cover plate is movably connected with the shell.

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