A double-belt double-speed quantitative feeder

Abstract

The present invention relates to a dual-belt dual-speed quantitative feeder, which includes a receiving hopper, a control gate, a feeding belt conveyor, a quantitative installation frame, a metering belt conveyor, a gantry, a weight calibration device, a force sensor, a speed sensor 1, a frequency converter 1 and a frequency converter 2; it also includes an intelligent touch screen field main control module, a multi-channel D / A conversion isolator, an intelligent digital collector 1, an output card DO, a weight placing actuator and a weight removing actuator; the output card DO output controls the corresponding weight placing actuator and the weight removing actuator, and completes the automatic weight calibration process without manual intervention. The present application can greatly improve the metering accuracy and stability of the belt speed regulating quantitative feeder, and ensure high-precision metering during long-term operation without human intervention, so that it can be widely applied to the requirements of industrial production in various industries.

Description

Technical Field

[0001] The invention relates to the field of industrial automation measurement and control, in particular to a double-belt double-speed regulating quantitative feeder. Background Art

[0002] At present, similar products in the domestic market, so-called speed-adjustable belt quantitative feeders (also known as belt speed-adjustable scales) are widely used. Most of them are imitation Schenck belt speed-adjustable quantitative feeders (imitating German Schenck technology) and Yamato belt speed-adjustable quantitative feeders (imitating Japanese Yamato technology). The mechanical structures and weighing principles of these two types of belt speed-adjustable quantitative feeders are similar.

[0003] like Figure 1 As shown in the figure, it is a Schenck belt speed regulating quantitative feeder, including a lower hopper 01, a feeding section 02, a metering section 03, a sensor 04 and a weight rack 05. The main features of its mechanical structure design are: the feeding section 02 and the metering section 03 use the same motor to drive the same belt. This structural design of dynamic feeding and continuous metering has the following defects:

[0004] 1. Due to the changes in the shape and amount of the material in the lower hopper 01, the pressure of the material on the belt changes frequently, causing the belt tension to change greatly. The so-called constant tension device is difficult to ensure constant belt tension, and the tension change causes the pressure of the material on the belt on the metering roller to change.

[0005] 2. Various factors can cause the belt to deviate easily, which will also affect the force of the material on the metering roller.

[0006] 3. Since feeding and metering are on the same belt, automatic zeroing without manual intervention cannot be achieved during online continuous operation. The zero point (tare weight) of any metering equipment changes due to various factors. Without online automatic zeroing function, it will be impossible to ensure the quantitative feeding accuracy in long-term operation.

[0007] 4. Fully automatic weight calibration cannot be achieved during online continuous operation. During long-term operation, when various factors cause changes in the parameters of force sensors, speed sensors or signal amplifiers, automatic weight calibration must be performed online at regular intervals. Otherwise, the stability of quantitative feeding accuracy cannot be ensured during long-term operation.

[0008] The above reasons lead to the unstable metering accuracy of the traditional speed-adjustable belt quantitative feeder during use, and the large metering error makes it difficult to meet the production requirements of various industries. Especially when the equipment management is not in place or it has been used for a long time, the metering accuracy error of the traditional belt speed-adjustable quantitative feeder is ≥±5%, or even more than 10%. This has been the status quo of this single-belt single-speed quantitative feeder for a long time. Summary of the invention

[0009] Since the above-mentioned traditional belt speed regulating quantitative feeder has various "defects" in the wide use in various industries, which affects the metering accuracy and has large metering accuracy errors, it is difficult to meet the needs of industrial production. The present invention provides a dual-belt dual-speed regulating quantitative feeder.

[0010] The present invention provides a dual-belt dual-speed quantitative feeder adopts the following technical solution:

[0011] A dual-belt dual-speed quantitative feeder, comprising a receiving hopper, a control gate, a feeding belt conveyor, a mounting frame, a metering belt conveyor, a gantry, a weight calibration device, a force sensor, a speed sensor 1, a frequency converter 1 and a frequency converter 2, wherein the control gate is mounted on the receiving hopper, the control gate controls the discharge thickness of the feeder, the feeding belt conveyor is horizontally mounted on the quantitative mounting frame, the number of the force sensors is at least three, one end of the force sensor is connected to the metering belt conveyor, the force sensor is suspended on the gantry and the mounting frame, suspending or lifting the metering belt conveyor, the feeding end of the metering belt conveyor is located directly below the discharging end of the feeding belt conveyor, the speed sensor 1 measures the speed of the metering belt conveyor in real time, the frequency converter 1 can change the speed of the feeding belt conveyor, and the frequency converter 2 can change the speed of the metering belt conveyor; the weight calibration device comprises a weight bracket, a weight cover plate, a customized calibration weight, and a lifter and a weight rack mounted on the weight bracket;

[0012] It also includes an intelligent touch screen, an on-site main control module, a multi-channel D / A conversion isolator, an intelligent digital collector, an output card DO, a weight placement actuator and a weight removal actuator. The intelligent touch screen and the on-site main control module are connected by MODBUS communication. The control value output by the on-site main control module is connected to the multi-channel D / A conversion isolator. One channel of the multi-channel D / A conversion isolator is connected to a frequency converter, and the output variable frequency three-phase power supply is connected to a feeding belt conveyor. The other channel is connected to a frequency converter, and the output variable frequency three-phase power supply is connected to a metering belt conveyor. The force signal output by the force sensor and the speed signal output by the speed sensor are connected to the intelligent digital collector, and after the force signal and speed signal are processed by the intelligent digital collector, they are sent to the on-site main control module by MODBUS communication. The intelligent touch screen controls the corresponding weight placement actuator and weight removal actuator through the output card DO output, and the weight calibration device completes the automatic weight calibration process without manual intervention.

[0013] In a preferred example, the present invention can be further configured as follows: the metering belt conveyor is provided with a speed sensor 2 for measuring the running speed of the metering belt conveyor, the speed sensor 2 is standby, the speed sensor 2 is electrically connected to an intelligent digital collector 2, the force signal output by the force sensor and the speed signal output by the speed sensor 2 are connected to the intelligent digital collector 2, and the intelligent digital collector processes the force signal and the speed signal and sends them to the on-site main control module using the MODBUS communication method.

[0014] In a preferred example, the present invention can be further configured as follows: a first belt cleaning device for cleaning materials is provided at the discharge end of the feeding belt conveyor, and a second belt cleaning device for cleaning materials is provided at the discharge end of the metering belt conveyor.

[0015] In a preferred example, the present invention can be further configured as follows: a discharging slide plate is provided at the discharging end of the feeding belt conveyor, and the material discharged by the feeding belt conveyor during operation falls on the discharging slide plate and naturally slides onto the belt of the metering belt conveyor.

[0016] In a preferred example, the present invention can be further configured as follows: the intelligent touch screen is electrically connected to a central control system.

[0017] In a preferred example, the present invention can be further configured as follows: the intelligent touch screen and the central control system are connected by DP card, MOBUS, Profibus communication mode to achieve remote operation and control.

[0018] In a preferred example, the present invention can be further configured as follows: the intelligent touch screen and the central control system are connected by means of switch quantity modules DI / DO and analog quantity modules AI / AO to achieve remote operation and control.

[0019] In summary, this application includes the following beneficial technical effects:

[0020] The dual-belt dual-speed quantitative feeder adopts a segmented mechanical structure design to maintain the material amount on the metering belt conveyor within a certain range, meeting the requirement of stable feeding flow; since the fully automatic weight calibration is very convenient and takes very little time, regular weight calibration (1 to 2 times a day) can be achieved, which goes without saying that improving the belt speed metering accuracy is guaranteed, greatly improving the metering accuracy and stability of the belt speed quantitative feeder, and improving the intelligence level, completely changing the "defects" of traditional belt speed quantitative feeders, ensuring high-precision metering during long-term operation without human intervention, so that it can be widely used in industrial production requirements of various industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of the prior art;

[0023] Figure 2 is a schematic structural diagram of an embodiment of the present invention;

[0024] Figure 3 is a side structural schematic diagram of an embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of a weight calibration device in an embodiment of the present invention;

[0026] Figure 5 is a control block diagram of an embodiment of the present invention.

[0027] Explanation of reference numerals: 01, lower hopper; 02, feeding section; 03, metering section; 04, sensor; 05, weight rack; 1, receiving hopper; 2, control gate; 3, feeding belt conveyor; 4, mounting frame; 5, metering belt conveyor; 6, gantry; 7, weight calibration device; 8, weight bracket; 9, lifter and weight rack; 10, weight cover; 11, customized calibration weight; 12, force sensor; 13, speed sensor 1; 14, speed sensor 2; 15, inverter 1; 16 , inverter 2; 17, central control system; 18, intelligent touch screen; 19, switch module DI / DO; 20, analog module AI / AO; 21, on-site master control module; 22, multi-channel D / A conversion isolator; 23, intelligent digital collector 1; 24, intelligent digital collector 2; 25, output card DO; 26, weight placement actuator; 27, weight removal actuator; 28, discharge slide; 29, belt cleaning device 1; 30, belt cleaning device 2; 31, DP card. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below.

[0029] Reference Figure 1-Figure 5 The embodiment of the present invention discloses a dual-belt dual-speed quantitative feeder, including a receiving hopper 1, a control gate 2, a feeding belt conveyor 3, an installation frame 4, a metering belt conveyor 5, a gantry 6, a weight calibration device 7, a force sensor 12, a speed sensor 1 13, a frequency converter 1 15 and a frequency converter 2 16.

[0030] Among them, the control gate 2 is installed on the receiving hopper 1, the control gate 2 controls the discharge thickness of the feeder, the feeding belt conveyor 3 is horizontally installed on the mounting frame 4, the number of force sensors 12 is at least three, one end of the force sensor 12 is connected to the metering belt conveyor 5, the force sensor 12 is suspended on the gantry 6 and the mounting frame 4, suspending or supporting the metering belt conveyor 5, the feeding end of the metering belt conveyor 5 is located directly below the discharge end of the feeding belt conveyor 3, the speed sensor 13 measures the speed of the metering belt conveyor 5 in real time, the frequency converter 15 outputs a variable frequency three-phase power supply connected to the feeding belt conveyor 3 to change the speed of the feeding belt conveyor 3, and the frequency converter 2 16 outputs a variable frequency three-phase power supply connected to the metering belt conveyor 5 to change the speed of the metering belt conveyor 5.

[0031] In order to ensure that each force sensor 12 plays a weighing role on the metering belt conveyor 5, generally, three or four force sensors 12 are set. When the number of force sensors 12 is three, two force sensors 12 are connected to the gantry 6, and one force sensor 12 is connected to the mounting frame 4; when the number of force sensors 12 is four, the force sensors 12 are divided into two groups, and each group of force sensors 12 is connected to one gantry 6.

[0032] Since the triangle has stability, it is more stable to connect three force sensors 12 to the metering belt conveyor 5. In this embodiment, three force sensors 12 are selected. In this embodiment, the force sensor 12 is a tension force sensor 12, which makes the metering belt conveyor 5 in a fully suspended state to achieve high-precision metering. The above content explains the feeding part of the quantitative feeder: the feeding belt conveyor 3 and the metering body part: the fully suspended metering belt conveyor 5 has no hard connection characteristics, and the metering body is in a fully suspended state.

[0033] In addition, when the speed sensor 13 is damaged, the speed of the metering belt conveyor 5 cannot be measured. Therefore, a speed sensor 2 14 for measuring the running speed of the metering belt conveyor 5 is installed on the metering belt conveyor 5. The speed sensor 2 14 is a spare speed sensor and is used after the speed sensor 13 is damaged.

[0034] In order to ensure the uniformity of the material delivered by the feeding belt conveyor 3, a discharging slide plate 28 is installed at the discharging end of the feeding belt conveyor 3. Specifically, the discharging slide plate 28 is made of a plate formed by extrusion of polyethylene. The feeding belt conveyor 3 only completes the feeding task of the material to be metered. When the feeding belt conveyor 3 is running, the material delivered falls on the polyethylene discharging slide plate 28 and naturally slides onto the belt of the fully suspended metering belt conveyor 5.

[0035] During the transportation of materials, there are some small amounts of materials adhering to the belt surface, which affects the metering accuracy. In order to ensure the metering accuracy, a belt cleaning device 29 for cleaning materials is installed at the discharge end of the feeding belt conveyor 3, and a belt cleaning device 30 for cleaning materials is installed at the discharge end of the metering belt conveyor 5.

[0036] The weight calibration device 7 includes a weight bracket 8, a weight cover 10, a customized calibration weight 11, and a lifter and a weight rack 9 installed on the weight bracket 8; the weight bracket 8 is provided in two sets, and the lifter and the weight rack 9 are also provided in two sets to meet the function of automatic weight calibration.

[0037] The dual-belt dual-speed quantitative feeder also includes an intelligent touch screen 18, a field main control module 21, a multi-channel D / A conversion isolator 22, an intelligent digital collector 1 23, an intelligent digital collector 2 24, an output card DO25, a weight placement actuator 26 and a weight removal actuator 27.

[0038] The intelligent touch screen 18 and the field main control module 21 are connected by MODBUS communication. The control value output by the field main control module 21 is connected to the multi-channel D / A conversion isolator 22. One channel of the multi-channel D / A conversion isolator 22 is connected to the frequency converter 15, and the output variable frequency three-phase power supply is connected to the feeding belt conveyor 3. The other channel is connected to the frequency converter 2 16, and the output variable frequency three-phase power supply is connected to the metering belt conveyor 5. The force signal output by the force sensor 12 and the speed signal output by the speed sensor 1 13 are connected to the intelligent digital collector 1 23. The force signal output by the force sensor 12 and the speed signal output by the speed sensor 2 14 are connected to the intelligent digital collector 2 24. After the force signal and the speed signal are processed by the intelligent digital collector 1 23 and the intelligent digital collector 2 24, they are sent to the field main control module 21 by MODBUS communication.

[0039] In this embodiment, the intelligent touch screen 18 is embedded, and the output card DO25 outputs and controls the corresponding weight placement actuator 26 and weight removal actuator 27. The weight calibration device 7 completes the automatic weight calibration process without human intervention.

[0040] In order to realize remote control of the quantitative feeder, in the present embodiment, the intelligent touch screen 18 is electrically connected to the central control system 17. The intelligent touch screen 18 and the central control system 17 can be connected in two ways to realize stable data transmission.

[0041] One way is to connect the intelligent touch screen 18 and the central control system 17 by using the communication mode of DP card 31, MOBUS, Profibus to realize remote operation and control.

[0042] Another way is to connect the intelligent touch screen 18 and the central control system 17 by means of a switch module DI / DO19 and an analog module AI / AO20 to achieve remote operation and control.

[0043] Through the mechanical structure and control system, the material in the hopper 1 flows into the belt of the feeding belt conveyor 3. Once the control system drives the feeding belt conveyor 3 to move, the material in the feeding belt conveyor 3 falls on the discharging slide plate 28 through the discharging port and slides onto the fully suspended metering belt. When the control system drives the metering belt conveyor 5, the material flow on the metering belt conveyor 5 is dynamically metered and controlled. Ensure that the material on the metering belt conveyor 5 is controlled within a certain range and the material flow is stably controlled at the feeding flow value.

[0044] When it is necessary to measure the deadweight (zero calibration) of the fully suspended metering belt conveyor 5, the on-site main control module 21 outputs through the multi-channel D / A conversion isolator 22: the first control output is "0" to the frequency converter 1 15, the feeding belt conveyor 3 loses power and stops running immediately, and the second outputs the maximum control signal to the frequency converter 2 16, so that the fully suspended belt conveyor runs at the fastest speed. Within about 10 seconds, the materials on the fully suspended belt conveyor are cleared. The control system can automatically start to measure the deadweight (zero point value) for about 30 seconds. Once the zero point measurement is completed, the main control module will immediately resume normal operation. The above-mentioned entire deadweight measurement time is only ≤60 seconds, realizing the online fully automatic zero calibration function.

[0045] When weight calibration is required, the above process control for determining the zero point is first entered. Once the zero calibration is completed, the intelligent touch screen 18 outputs a switch signal through the output card DO25 to connect the weight placing actuator 26, that is, the small electric lifter works. In about 8 seconds, the two customized calibration weights 11 are slowly placed on the two weight brackets 8 on the metering belt conveyor 5. The on-site main control module 21 starts to automatically measure the weight of the weight and displays the weight on the intelligent touch screen 18. After about 60 seconds of weight measurement, the intelligent touch screen 18 outputs a switch signal through the output card DO25 to drive the weight withdrawal actuator 27, so that the weights in the automatic weight calibration device 7 are withdrawn from the metering belt conveyor 5, and the two customized calibration weights 11 are slowly placed on the two weight brackets 8 of the weighing frame. The entire weight calibration time is only about less than 3 minutes, completing the online fully automatic weight calibration function. If the machine is in continuous production for 24 hours, it only takes 5 to 6 minutes and does not require manual intervention to realize the secondary weight calibration, which completely solves the problem of difficult calibration of the belt speed regulating quantitative feeder. Since the dual-belt dual-speed quantitative feeder has such a convenient and simple zero point measurement and weight calibration function, it can naturally ensure the metering accuracy in long-term continuous operation.

[0046] The three force sensors 12 of the suspended metering belt conveyor 5, the output signals are simultaneously connected to the intelligent digital collector 1 23 and the intelligent digital collector 2 24. The belt speed on the metering belt conveyor 5: the speed sensor 1 13 is connected to the intelligent digital collector 1 23, the speed sensor 2 14 is connected to the intelligent digital collector 2 24. These two digital collectors set up a duplex collection function for the force signal and speed signal of the quantitative feeder, and use a communication method to send the force signal and speed signal processed by the intelligent collector to the on-site main control module.

[0047] The performance tracking of the force sensor 12, velocity sensor, and intelligent digital collector that determine the measurement accuracy is realized. When the performance of one of the three devices changes, the control system will prompt the user: whether the performance of the force sensor 12, velocity sensor, or intelligent digital collector has changed, and display the changed value so that the user can determine whether it needs to be replaced. In other words, the performance parameters of the key components that affect the measurement accuracy of the product in long-term continuous operation are transparent and tracked. This function is an original new idea and new technology among similar products in this field. It further ensures the measurement accuracy, stability, and reliability of the project in long-term operation.

[0048] Table 1: Comparison of similar technologies, products and services

[0049]

[0050]

[0051] The implementation principle of the present invention is:

[0052] The feeding section of the present invention is independently completed by a feeding belt conveyor 3, and the metering section is independently completed by another fully suspended metering belt conveyor 5 suspended by a tension force sensor 12. The defect that the original traditional belt feeding section and metering section are combined on the same belt conveyor, which affects the metering accuracy, is completely eliminated; a set of weight calibration device 7 is added in the present invention, which creates conditions for realizing online full-automatic weight calibration without manual intervention.

[0053] By connecting the signals of force sensor 12, speed sensor 1 13, and speed sensor 2 14 to intelligent digital collector 1 23 and intelligent digital collector 2 24, online automatic zeroing and fully automatic weight calibration are realized during long-term operation, and online tracking and prompting of performance changes of each sensor and digital collector are realized, ensuring high-precision measurement of the quantitative feeder during long-term continuous operation. This innovative technology has greatly improved the measurement accuracy stability index and reliability of this product compared with traditional similar products. For the first time, online fully automatic weight calibration is realized for the belt speed quantitative feeder without human intervention, and the weight calibration value is very close to the material discharge calibration value through software design, and the error between the two is ≤±0.25%.

[0054] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A dual-belt dual-speed quantitative feeder, characterized in that: The invention comprises a receiving hopper (1), a control gate (2), a feeding belt conveyor (3), a mounting frame (4), a metering belt conveyor (5), a gantry (6), a weight calibration device (7), a force sensor (12), a speed sensor 1 (13), a frequency converter 1 (15) and a frequency converter 2 (16), wherein the control gate (2) is mounted on the receiving hopper (1), the control gate (2) controls the discharge thickness of the feeder, the feeding belt conveyor (3) is horizontally mounted on the quantitative mounting frame (4), the number of the force sensors (12) is at least three, one end of the force sensor (12) is connected to the metering belt conveyor (5), and the force sensor (12) is connected to the metering belt conveyor (5). 12) is suspended on the gantry (6) and the mounting frame (4), suspending or supporting the metering belt conveyor (5), wherein the feeding end of the metering belt conveyor (5) is located directly below the discharging end of the feeding belt conveyor (3), the speed sensor 1 (13) measures the speed of the metering belt conveyor (5) in real time, the frequency converter 1 (15) can change the speed of the feeding belt conveyor (3), and the frequency converter 2 (16) can change the speed of the metering belt conveyor (5); the weight calibration device (7) includes a weight bracket (8), a weight cover plate (10), a customized calibration weight (11), and a lifter and a weight rack (9) mounted on the weight bracket (8); The device also comprises an intelligent touch screen (18), an on-site main control module (21), a multi-channel D / A conversion isolator (22), an intelligent digital collector (23), an output card DO (25), a weight placement actuator (26) and a weight removal actuator (27), wherein the intelligent touch screen (18) and the on-site main control module (21) are connected by MODBUS communication, the control value output by the on-site main control module (21) is connected to the multi-channel D / A conversion isolator (22), one of the channels of the multi-channel D / A conversion isolator (22) is connected to a frequency converter (15), the output variable frequency three-phase power supply is connected to a feed belt conveyor (3), and the other channel is connected to a frequency converter (15). The variable frequency three-phase power supply outputted by the force sensor (12) and the speed signal outputted by the speed sensor (13) are connected to the intelligent digital collector (23). After the force signal and the speed signal are processed by the intelligent digital collector (23), they are sent to the on-site main control module (21) by using the MODBUS communication method. The intelligent touch screen (18) controls the corresponding weight placement actuator (26) and weight removal actuator (27) through the output card DO (25). The weight calibration device (7) completes the automatic weight calibration process without manual intervention.

2. A dual-belt dual-speed quantitative feeder according to claim 1, characterized in that: The metering belt conveyor (5) is provided with a second speed sensor (14) for measuring the running speed of the metering belt conveyor (5), the second speed sensor (14) is in standby mode, the second speed sensor (14) is electrically connected to a second intelligent digital collector (24), the force signal output by the force sensor (12) and the speed signal output by the second speed sensor (14) are connected to the second intelligent digital collector (24), and the first intelligent digital collector (23) processes the force signal and the speed signal and sends them to the on-site main control module (21) by using a MODBUS communication method.

3. A dual-belt dual-speed quantitative feeder according to claim 1 or 2, characterized in that: The discharging end of the feeding belt conveyor (3) is provided with a belt cleaning device (29) for cleaning materials, and the discharging end of the measuring belt conveyor (5) is provided with a belt cleaning device (30) for cleaning materials.

4. The dual-belt dual-speed quantitative feeder according to claim 1, characterized in that: A discharging slide plate (28) is provided at the discharging end of the feeding belt conveyor (3). When the feeding belt conveyor (3) is in operation, the material discharged falls on the discharging slide plate (28) and naturally slides onto the belt of the metering belt conveyor (5).

5. The dual-belt dual-speed quantitative feeder according to claim 1, characterized in that: The intelligent touch screen (18) is electrically connected to a central control system (17).

6. The double-belt double-speed regulating quantitative feeder according to claim 5, characterized in that: The intelligent touch screen (18) and the central control system (17) are connected by a DP card (31), MOBUS, or Profibus communication method to achieve remote operation and control.

7. The double-belt double-speed regulating quantitative feeder according to claim 5, characterized in that: The intelligent touch screen (18) and the central control system (17) are connected by means of a switch quantity module DI / DO (19) and an analog quantity module AI / AO (20) to achieve remote operation and control.

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