Weighing sensor matching device

Abstract

The utility model provides a weighing sensor matching device, which comprises a bracket and a circuit board, and is characterized in that the bracket is provided with a first fixing table and a second fixing table, and the first fixing table and the second fixing table are respectively used for fixing a first weighing sensor and a second weighing sensor to be matched; the circuit board is arranged on the support, a first resistor, a second resistor, a voltmeter interface, a power interface and a sensor interface are arranged on the circuit board, and the resistance values of the first resistor and the second resistor are equal; the first resistor is located in the first branch circuit, the second resistor is located in the second branch circuit, the voltmeter interface comprises a voltmeter positive electrode interface and a voltmeter negative electrode interface, and the voltmeter positive electrode interface and the voltmeter negative electrode interface are located between the resistors and the weighing sensors on the branch circuits respectively. According to the weighing sensor matching device provided by the invention, the Wheatstone bridge principle is utilized, the matching precision of the weighing sensor is improved, and the metering precision of the electronic belt scale after the weighing sensor with high matching precision is replaced is higher.

Description

Technical Field

[0001] The present application relates to the field of measurement technology, and in particular to a matching device for a weighing sensor. Background Art

[0002] The YT8P electronic belt scale control system is a centralized electronic control system that integrates metering and control, and has parameter metering and target control. It can realize continuous metering and flow control of tobacco in the process of the silk production line. The electronic belt scale usually has two metering rollers, and a weighing sensor is fixed at both ends of each metering roller. Each set of sensor signal lines and power lines are connected to the same amplifier circuit board. During production, the pressure of the metering roller is received by each set of sensors. After the pressure signal is processed by the amplifier circuit board, it is transmitted to the PLC control unit for weight calculation. In production maintenance, the matching accuracy of the weighing sensor of the electronic belt scale is crucial to the accuracy of measurement.

[0003] During the maintenance of the currently used electronic scales, after the weighing sensor is replaced, the electronic scale is debugged and matched by weight measurement using the amplifying circuit board and the PLC program to adjust the measurement accuracy to within the qualified range. Specifically, after replacing the weighing sensor, the static sensor performance is calibrated through the on-site control screen, and then multiple weight measurement tests are performed until the measurement results meet the measurement accuracy requirements. However, the matching accuracy of the weighing sensor is not high through the above method, and the measurement fluctuation of the electronic belt scale is large. Utility Model Content

[0004] In order to at least partially solve the above problems, an embodiment of the present application provides a weighing sensor matching device, the weighing sensor is a resistive strain sensor, the matching device includes a bracket and a circuit board, the bracket is provided with a first fixing platform and a second fixing platform, the first fixing platform and the second fixing platform are respectively used to fix the first weighing sensor and the second weighing sensor to be matched; the circuit board is arranged on the bracket, and the circuit board is provided with a first resistor, a second resistor, a voltmeter interface, a power supply interface and a sensor interface, and the resistance values ​​of the first resistor and the second resistor are equal; wherein the power supply interface includes a positive power supply interface and a negative power supply interface, when the first weighing sensor and the second weighing sensor are matched by the matching device, the positive power supply interface to the negative power supply interface includes a first branch and a second branch connected in parallel with each other, the first The resistor is located in the first branch, and the second resistor is located in the second branch. The sensor interface includes a first sensor interface and a second sensor interface. The first weighing sensor is connected to the first branch in series with the first resistor through the first sensor interface, and the second weighing sensor is connected to the second branch in series with the second resistor through the second sensor interface. Along the current flow direction, the first weighing sensor and the second weighing sensor are respectively located on the same side of the first resistor and the second resistor. The voltmeter interface includes a voltmeter positive electrode interface and a voltmeter negative electrode interface. The voltmeter positive electrode interface is connected to the first branch or the second branch, and the voltmeter negative electrode interface is connected to the branch of the first branch and the second branch that is not connected with the voltmeter positive electrode interface. The voltmeter positive electrode interface and the voltmeter negative electrode interface are respectively located between the resistor and the weighing sensor on the branch where they are located.

[0005] In some embodiments, the weighing sensor matching device further includes a first standard weight and a second standard weight, the first standard weight and the second standard weight have the same mass, and the first standard weight and the second standard weight can be connected to the sensing positions of the first weighing sensor and the second weighing sensor, respectively.

[0006] In some embodiments, the weighing sensor matching device further includes a voltmeter, and a positive pole and a negative pole of the voltmeter are respectively connected to a positive pole interface and a negative pole interface of the voltmeter.

[0007] In some embodiments, the weighing sensor matching device also includes a power module, and the positive pole and negative pole of the power module are respectively connected to the positive power interface and the negative power interface.

[0008] In some embodiments, the weighing sensor matching device further includes a switch, and the switch is disposed on a trunk line common to the first branch and the second branch.

[0009] In some embodiments, the bracket includes a base, a support rod and a cantilever, the support rod is arranged on the base, the cantilever is arranged on the support rod, and the first fixing platform and the second fixing platform are arranged on the cantilever.

[0010] In some embodiments, one end of the support rod is connected to the base, the other end of the support rod is connected to the middle of the cantilever, and the first fixing platform and the second fixing platform are symmetrically located on both sides of the support rod.

[0011] In some embodiments, the bracket further includes a circuit board support frame, the circuit board support frame is arranged on the support rod, and the circuit board is arranged on the circuit board bracket.

[0012] In some embodiments, the circuit board support frame is triangular, one corner of the circuit board support frame is connected to the support rod, and a circuit board is arranged on a side of the circuit board support frame opposite to the corner.

[0013] In some embodiments, the bracket is made of metal.

[0014] The weighing sensor matching device provided by the embodiment of the present application, the first resistor and the second resistor arranged on the bracket form a Wheatstone bridge with the internal resistance of the first weighing sensor and the second weighing sensor to be matched. When measuring, weights of the same mass can be hung on the first weighing sensor and the second weighing sensor respectively, and then a voltmeter is used to connect the voltmeter interface to observe the voltage indication number. If the voltage indication number is less than the specified value, the internal resistance of the first weighing sensor and the second weighing sensor is close, and it can be determined that the matching of the first weighing sensor and the second weighing sensor is high, otherwise the matching is low. The weighing sensor matching device provided by the embodiment of the present application uses the Wheatstone bridge principle to improve the matching accuracy of the weighing sensor, so that the electronic belt scale has higher measurement accuracy after replacing the weighing sensor with higher matching accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 is a schematic diagram of a weighing sensor matching device provided in an embodiment of the present application;

[0017] Figure 2 is a schematic diagram of a circuit board provided in an embodiment of the present application;

[0018] Figure 3 is a schematic diagram of a weighing sensor matching device provided in an embodiment of the present application;

[0019] Figure 4 is a front view of a weighing sensor matching device provided in an embodiment of the present application;

[0020] Figure 5 It is a top view of the weighing sensor matching device provided in an embodiment of the present application.

[0021] The reference numerals are as follows:

[0022] 1. First fixed platform; 2. Bracket; 3. Second fixed platform; 4. Circuit board support frame; 5. Base; 6. First weighing sensor; 7. Second weighing sensor; 8. Circuit board; 9. Voltmeter; 10. Power supply module; 11. First standard weight; 12. Second standard weight; 13. First resistor; 14. Second resistor; 15. Power supply positive electrode interface; 16. Power supply negative electrode interface; 17. Sensor interface; 18. Voltmeter positive electrode interface; 19. Voltmeter negative electrode interface; 20. Switch.

[0023] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0024] The technical scheme of the preferred embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection claimed in the present application.

[0025] The words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] like Figure 1-Figure 5 As shown, the embodiment of the present application provides a weighing sensor matching device, and the weighing sensor is a resistive strain sensor. Figure 1 , Figure 4 and Figure 5 The matching device includes a bracket 2 and a circuit board 8. The bracket 2 is provided with a first fixing platform 1 and a second fixing platform 3. The first fixing platform 1 and the second fixing platform 3 are used to fix the first weighing sensor 6 and the second weighing sensor 7 to be matched. The first weighing sensor 6 and the second weighing sensor 7 can be in the shape of a quadrangular prism. The first fixing platform 1 and the second fixing platform 3 can form a supporting plane. The first weighing sensor 6 and the second weighing sensor 7 can be fixed on the first fixing platform 1 and the second fixing platform 3 respectively. Figure 2 The circuit board 8 is arranged on the bracket 2. The circuit board 8 is provided with a first resistor 13, a second resistor 14, a voltmeter interface, a power interface and a sensor interface 17. The resistance values ​​of the first resistor 13 and the second resistor 14 are equal. Among them, the power interface includes a positive power interface 15 and a negative power interface 16. Figure 3 When the first weighing sensor 6 and the second weighing sensor 7 are matched by the matching device, the power supply positive electrode interface 15 to the power supply negative electrode interface 16 includes a first branch and a second branch connected in parallel with each other, the first resistor 13 is located in the first branch, and the second resistor 14 is located in the second branch. The sensor interface 17 includes a first sensor interface and a second sensor interface. The first weighing sensor 6 is connected to the first branch in series with the first resistor 13 through the first sensor interface, and the second weighing sensor 7 is connected to the second branch in series with the second resistor 14 through the second sensor interface. Along the current flow direction, the first weighing sensor 6 and the second weighing sensor 7 are respectively located on the same side of the first resistor 13 and the second resistor 14, that is, the order in which the current passes through the first resistor 13 and the first weighing sensor 6 in the first branch is the same as the order in which the current passes through the second resistor 14 and the second weighing sensor 7 in the second branch. The voltmeter interface includes a voltmeter positive electrode interface 18 and a voltmeter negative electrode interface 19. The voltmeter positive electrode interface 18 is connected to the first branch or the second branch. The voltmeter negative electrode interface 19 is connected to the branch of the first branch and the second branch that is not connected with the voltmeter positive electrode interface 18. The voltmeter positive electrode interface 18 and the voltmeter negative electrode interface 19 are respectively located between the resistor and the weighing sensor on the branch where they are located. For example, the voltmeter positive electrode interface 18 can be located between the first resistor 13 and the first weighing sensor 6, and the voltmeter negative electrode interface 1 can be located between the second resistor 14 and the second weighing sensor 7. When matching the weighing sensors, the positive and negative electrodes of the voltmeter 9 can be connected to the voltmeter positive electrode interface 18 and the voltmeter negative electrode interface 19 respectively, and the matching degree of the weighing sensor can be obtained through the reading of the voltmeter 9. Specifically, in Figure 3 In the illustrated embodiment, the first branch may include a first resistor 13 and a first weighing sensor 6, and the second branch may include a second resistor 14 and a second weighing sensor 7. The first branch and the second branch are connected in parallel, and the current flowing out through the power module 10 is divided into two paths and passes through the first branch and the second branch. Since the resistance values ​​of the first resistor 13 and the second resistor 14 are equal, according to the Wheatstone bridge principle, the closer the internal resistances of the first weighing sensor 6 and the second weighing sensor 7 are, the smaller the reading of the voltmeter 9 is. When the reading of the voltmeter 9 is less than the specified value, it can be considered that the first weighing sensor 6 and the second weighing sensor 7 have a high matching degree, and then the weighing sensors with high matching degree are replaced in groups to improve the measurement accuracy of the electronic belt scale.

[0027] The weighing sensor matching device provided by the embodiment of the present application, the first resistor 13 and the second resistor 14 arranged on the bracket 2 form a Wheatstone bridge with the internal resistance of the first weighing sensor 6 and the second weighing sensor 7 to be matched. When measuring, weights of the same mass can be hung on the first weighing sensor 6 and the second weighing sensor 7 respectively, and then a voltmeter 9 is used to connect the voltmeter interface, and the reading of the voltmeter 9 is observed. If the reading of the voltmeter 9 is less than the specified value, the internal resistance of the first weighing sensor 6 and the second weighing sensor 7 is close, and it can be determined that the matching of the first weighing sensor 6 and the second weighing sensor 7 is high, otherwise the matching is low. The weighing sensor matching device provided by the embodiment of the present application uses the Wheatstone bridge principle to improve the matching accuracy of the weighing sensor, so that the electronic belt scale has higher measurement accuracy after replacing the weighing sensor with higher matching accuracy.

[0028] In some embodiments, the weighing sensor matching device further includes a first standard weight 11 and a second standard weight 12, the first standard weight 11 and the second standard weight 12 have the same mass, and the first standard weight 11 and the second standard weight 12 can be respectively connected to the sensing positions of the first weighing sensor 6 and the second weighing sensor 7. Exemplarily, the sensing positions of the first weighing sensor 6 and the second weighing sensor 7 can be provided with nuts of the same mass or internal threads, and the first standard weight 11 and the second standard weight 12 are respectively connected to the first weighing sensor 6 and the second weighing sensor 7 through screws of the same mass.

[0029] In some embodiments, the weighing sensor matching device further includes a voltmeter 9, and the positive and negative electrodes of the voltmeter 9 are respectively connected to the voltmeter positive electrode interface 18 and the voltmeter negative electrode interface 19. In this embodiment, by integrating the voltmeter 9 in the weighing sensor matching device, the use of the weighing sensor matching device can be made more convenient. Exemplarily, the voltmeter 9 can be set on the circuit board 8.

[0030] In some embodiments, the weighing sensor matching device further includes a power module 10, and the positive and negative electrodes of the power module 10 are respectively connected to the positive power interface 15 and the negative power interface 16. In this embodiment, by integrating the power module 10 in the weighing sensor matching device, the use of the weighing sensor matching device can be made more convenient. Exemplarily, the power module 10 can be arranged on the circuit board 8, and the power module 10 can be a 9V DC power supply.

[0031] In some embodiments, the weighing sensor matching device further comprises a switch 20, and the switch 20 is arranged on a trunk common to the first branch and the second branch. In this embodiment, by arranging the switch 20, the weighing sensor matching device can be conveniently started or stopped.

[0032] In some embodiments, the bracket 2 includes a base 5, a support rod and a cantilever, the support rod is arranged on the base 5, the cantilever is arranged on the support rod, and the first fixed platform 1 and the second fixed platform 3 are arranged on the cantilever. In this embodiment, through this arrangement, it is convenient for the first standard weight 11 and the second standard weight 12 to apply the same pulling force to the first weighing sensor 6 and the second weighing sensor 7 respectively through their own gravity.

[0033] In some embodiments, one end of the support rod is connected to the base 5, and the other end of the support rod is connected to the middle of the cantilever, and the first fixed platform 1 and the second fixed platform 3 are symmetrically located on both sides of the support rod. In this embodiment, the support rod and the cantilever can form a T shape. Through this arrangement, the center of gravity of the weighing sensor matching device can be made more stable to prevent the device from tipping over during matching.

[0034] In some embodiments, the bracket 2 also includes a circuit board support frame 4, the circuit board support frame 4 is arranged on the support rod, and the circuit board 8 is arranged on the circuit board 8 bracket 2. In this embodiment, this arrangement makes the layout of the circuit board 8 more reasonable, and can make the first weighing sensor 6 and the second weighing sensor 7 conveniently connected to the sensor interface 17 on the circuit board 8. In some embodiments, the circuit board support frame 4 is a triangle, one corner of the circuit board support frame 4 is connected to the support rod, and the circuit board 8 is arranged on an edge of the circuit board support frame 4 opposite to the corner. In this embodiment, the circuit board support frame 4 of this shape can provide more stable support for the circuit board 8. In some embodiments, the bracket 2 is made of metal, which is strong and durable and not easy to deform.

[0035] Exemplarily, the working method of the weighing sensor matching device provided in the embodiment of the present application can be: first, one end of the first weighing sensor 6 and the second weighing sensor 7 that need to be precision matched are fixed on the first fixed platform 1 and the second fixed platform 3 respectively, and the other ends of the two weighing sensors are fixed with nuts to install the first standard weight 11 and the second standard weight 12 respectively, the weighing sensor signal line and the power line are connected to the sensor interface 17 of the circuit board 8, the positive and negative poles of the 9V power supply are connected to the positive power interface 15 and the negative power interface 16 of the circuit board 8 respectively, the positive and negative poles of the voltmeter 9 are connected to the positive voltmeter interface 18 and the negative voltmeter interface 19 of the circuit board 8 respectively, turn on the switch, observe the reading of the voltmeter 9, when the reading of the voltmeter 9 is less than the specified value, it is judged that the matching accuracy of the two weighing sensors is high, if the reading of the voltmeter 9 is greater than the specified value, it is judged that the matching accuracy of the two sensors is low.

[0036] The weighing sensor matching device provided in the embodiments of the present application has the following beneficial effects:

[0037] 1. Improve the matching accuracy of the weighing sensor. Before replacing the metering roller sensor for maintenance, match the four sensors with high matching accuracy and replace the weighing sensors in groups.

[0038] 2. Improved measurement accuracy. Because the four weighing sensors have high matching accuracy and the measurement fluctuations of the front and rear measuring rollers are stable, the measurement accuracy of the electronic belt scale is improved.

[0039] 3. Easy to store and use. The integrated matching device is designed with a small size for easy storage or transportation, and can be moved to different locations for use according to work needs.

[0040] 4. Strong and durable. The frame is made of metal, which is strong and durable and not easy to deform.

[0041] 5. Strong adaptability. This matching device can not only accurately match the weighing sensor, but also adapt to other electrical devices that conform to the Wheatstone bridge principle.

[0042] Based on the above-mentioned embodiments of the present application, in the absence of explicit negation or conflict, the technical features of one embodiment may be beneficially combined with one or more other embodiments.

[0043] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are only for illustration and not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A weighing sensor matching device, wherein the weighing sensor is a resistive strain sensor, characterized in that: The matching device comprises: A bracket, wherein a first fixing platform and a second fixing platform are provided on the bracket, wherein the first fixing platform and the second fixing platform are respectively used to fix a first weighing sensor and a second weighing sensor to be matched; A circuit board, the circuit board is arranged on the bracket, and a first resistor, a second resistor, a voltmeter interface, a power interface and a sensor interface are arranged on the circuit board, and the resistance values ​​of the first resistor and the second resistor are equal; wherein the power interface includes a positive power interface and a negative power interface, and when the first weighing sensor and the second weighing sensor are matched by the matching device, The circuit from the positive power supply interface to the negative power supply interface includes a first branch and a second branch connected in parallel with each other, the first resistor is located in the first branch, and the second resistor is located in the second branch. The sensor interface includes a first sensor interface and a second sensor interface, the first weighing sensor is connected to the first branch in series with the first resistor through the first sensor interface, and the second weighing sensor is connected to the second branch in series with the second resistor through the second sensor interface. Along the flow direction of the current, the first weighing sensor and the second weighing sensor are respectively located on the same side of the first resistor and the second resistor. The voltmeter interface includes a voltmeter positive interface and a voltmeter negative interface, the voltmeter positive interface is connected to the first branch or the second branch, the voltmeter negative interface is connected to the branch of the first branch and the second branch that is not connected to the voltmeter positive interface, and the voltmeter positive interface and the voltmeter negative interface are respectively located between the resistor and the weighing sensor on the branch where they are located.

2. The weighing sensor matching device according to claim 1, characterized in that: Also includes: A first standard weight and a second standard weight, wherein the first standard weight and the second standard weight have the same mass, and the first standard weight and the second standard weight can be connected to the sensing positions of the first weighing sensor and the second weighing sensor respectively.

3. The weighing sensor matching device according to claim 1, characterized in that: Also includes: A voltmeter, wherein the positive pole and the negative pole of the voltmeter are connected to the positive pole interface of the voltmeter and the negative pole interface of the voltmeter respectively.

4. The weighing sensor matching device according to claim 1, characterized in that: Also includes: A power module, wherein the positive electrode and the negative electrode of the power module are connected to the positive power interface and the negative power interface respectively.

5. The weighing sensor matching device according to claim 1, characterized in that: Also includes: A switch is provided on a trunk line common to the first branch and the second branch.

6. The weighing sensor matching device according to claim 1, characterized in that: The support comprises a base, a support rod and a cantilever, wherein the support rod is arranged on the base, the cantilever is arranged on the support rod, and the first fixing platform and the second fixing platform are arranged on the cantilever.

7. The weighing sensor matching device according to claim 6, characterized in that: One end of the support rod is connected to the base, the other end of the support rod is connected to the middle of the cantilever, and the first fixing platform and the second fixing platform are symmetrically located on both sides of the support rod.

8. The weighing sensor matching device according to claim 6, characterized in that: The bracket also includes a circuit board support frame, the circuit board support frame is arranged on the support rod, and the circuit board is arranged on the circuit board bracket.

9. The weighing sensor matching device according to claim 8, characterized in that: The circuit board support frame is in a triangular shape, one corner of the circuit board support frame is connected to the support rod, and the circuit board is arranged on a side of the circuit board support frame opposite to the corner.

10. The weighing sensor matching device according to claim 1, characterized in that: The bracket is made of metal.

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