Equal-armed upper vessel type suspension fiber photoelectric balance

Abstract

The utility model discloses an equal-armed upper vessel type suspension wire photoelectric balance which comprises a balance base, a suspension wire is arranged on the balance base, the middle of an equal-armed balance beam is connected with the suspension wire, one end of an equal-armed balance is provided with a sensor connecting seat, the other end of the equal-armed balance is provided with a counterweight disc, a connecting rod is vertically and fixedly arranged below the middle of the equal-armed balance beam, and a magnetic core seat is arranged on the connecting rod. A permanent magnetic core is arranged on the magnetic core seat, a coil is sleeved outside the permanent magnetic core, a diaphragm is arranged at the bottom of the connecting rod, a slit is arranged on the diaphragm, a light emitting diode is arranged on one side of the diaphragm, and a phototriode is arranged on the other side of the diaphragm. According to the device, the beam of the equal-armed balance is pulled up to be in a suspended state by using the suspension wire, the phototriode captures light sensation through inclination of the slit on the diaphragm sheet, coil current is adjusted to generate magnetic force to pull the beam of the equal-armed balance to rapidly reach a balance position, the equal-armed balance sensitivity is higher than that of a single-armed balance, the swing overshoot is smaller, and the balance precision is higher. The device is high in positioning and resetting precision, few in combined parts, simple in structure and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the field of photoelectric balances, in particular to an equal-arm top-pan suspension-wire photoelectric balance. Background Art

[0002] The top-pan photoelectric balance is a high-precision weighing instrument, which is widely used in laboratory and production environments, such as sample preparation, formulation, counting and statistical quality control. The characteristic of this balance is that its weighing pan is located above the weighing sensor, and it can provide a wide range of capacities.

[0003] The existing top-pan photoelectric balance has a single-arm structure, with a complex mechanical structure and a large number of combined parts inside the balance. The mechanical balancing of the single-arm structure requires multiple actions such as simultaneously adjusting the front and rear sling brackets, beam fixing screws, front and rear counterweights, upper and lower sensitivity nuts, photosensitive detectors, balance magnetic cores and the cooperation angles of the hook rings to be repeatedly assembled to meet the primary mechanical performance test standard of the top-pan photoelectric balance. Therefore, the single-arm structure is difficult to balance and has great application limitations. Moreover, due to factors such as the precision of parts and the cumulative tolerances of repeated assembly of each core component, the current top-pan photoelectric balance can no longer effectively improve the measurement accuracy and accuracy, and has great limitations in the use scenario, and the maintenance difficulty is extremely high. Therefore, optimization and improvement are needed. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide an equal-arm top-pan suspension-wire photoelectric balance.

[0005] The technical solution of the utility model is as follows: An equal-arm top-pan suspension-wire photoelectric balance, characterized by comprising:

[0006] A balance base, the interior of the balance base is hollow to form an installation cavity, the installation cavity penetrates through the balance base upwards, balance reeds are respectively arranged on the front and rear sides of the upper end of the balance base, an angle-adjustable suspension-wire mounting plate is arranged on the balance reed, and a suspension wire suspended above the installation cavity is arranged between the two suspension-wire mounting plates;

[0007] An equal-arm balance beam, the equal-arm balance beam extends in the left-right direction, the middle of the equal-arm balance beam is connected to the suspension wire, one end of the left and right ends of the equal-arm balance is provided with a sensor socket, the other end is provided with a counterweight pan, a sensitivity stud is arranged below the counterweight pan, a sensitivity nut is arranged on the sensitivity stud, and a sensitivity weight is arranged at the bottom of the sensitivity stud;

[0008] Electromagnetic balance assembly. The electromagnetic balance assembly includes a connecting rod, a light barrier sheet, a magnetic core seat, a permanent magnet core, a coil, a light-emitting diode, and a photosensitive triode. The connecting rod is vertically fixed below the middle of the equal-arm balance beam and extends downward into the installation cavity. The magnetic core seat is provided on the connecting rod. A plurality of permanent magnet cores symmetrically arranged left and right about the central axis of the connecting rod are provided on the magnetic core seat. Each permanent magnet core is externally sleeved with a coil. The coil is fixed on the balance base. The light barrier sheet is provided at the bottom of the connecting rod. A vertical slit is provided on the light barrier sheet. A light-emitting diode is provided on one side in the thickness direction of the light barrier sheet, and a photosensitive triode is provided on the other side. The light-emitting diode and the photosensitive triode are both fixed on the balance base. The photosensitive triode is electrically connected to the coil.

[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0010] 1. This device uses a suspension wire connected to the middle of the equal-arm balance beam to lift the equal-arm balance beam into a suspended state. When the equal-arm balance beam under the independent suspension wire structure is performing weighing measurements, it allows a smaller inclination and finer mil division. Therefore, the sensitivity is relatively high.

[0011] 2. When balancing the equal-arm balance beam, rapid mechanical balancing can be achieved by adjusting the weights on the counterweight plate at one end of the equal-arm balance beam. This balancing method is simple and convenient, and can achieve disassembly-free balancing.

[0012] 3. This device makes the photosensitive triode capture the light sense by tilting the slit on the light barrier sheet, thereby adjusting the coil current to generate a magnetic force to pull the equal-arm balance beam to quickly reach the balanced position. This equal-arm balance sensitivity is higher than that of the single-arm type, with a smaller overshoot during swinging, higher positioning and resetting accuracy. Moreover, this device has fewer combined parts and a simple structure, which can effectively improve the processing accuracy of parts. The overall mechanism is integrally arranged, with reasonable design, simple operation, and convenient maintenance.

[0013] The additional aspects and advantages of the present utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings:

[0015] Figure 1 It is a front-side three-dimensional view of the present utility model;

[0016] Figure 2 is the rear three-dimensional view of the present utility model;

[0017] Figure 3 is the top view of the present utility model;

[0018] Figure 4 is Figure 3 the sectional view taken along line A-A in

[0019] Figure 5 is Figure 3 the sectional view taken along line B-B in

[0020] Figure 6 is the schematic view of the partial structure of the present utility model;

[0021] Reference numerals:

[0022] 1, balance base; 2, installation cavity; 3, balance reed; 4, suspension wire mounting plate; 5, suspension wire; 6, suspension wire pressing plate; 7, support seat; 8, through hole; 9, support plate; 10, equal-arm balance beam; 11, sensor socket; 12, counterweight disk; 13, sensitivity adjusting stud; 14, sensitivity adjusting nut; 15, sensitivity weight; 16, connecting rod; 17, diaphragm; 18, magnetic core seat; 19, permanent magnetic core; 20, coil; 21, light-emitting diode; 22, photosensitive triode; 23, slit; 24, limit support column; 25, limit rod. Detailed implementation manners

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "vertical", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0025] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] As Figures 1 - 6 shown, an equal-arm top-pan suspension fiber 5 electro-optical balance, characterized in that it comprises: a balance base 1, an equal-arm balance beam 10 and an electromagnetic balance assembly.

[0027] As Figures 1 - 4 shown, the balance base 1 is hollow inside to form an installation cavity 2. The installation cavity 2 penetrates the balance base 1 upward. On the front and rear sides of the upper end of the balance base 1, balance reeds 3 are respectively provided. An angle-adjustable suspension fiber mounting plate 4 is provided on the balance reed 3. A suspension fiber 5 is suspended above the installation cavity 2 between the two suspension fiber mounting plates 4.

[0028] As Figure 1 , Figure 2 and Figure 4 shown, the equal-arm balance beam 10 extends in the left-right direction. The middle part of the equal-arm balance beam 10 is connected to the suspension fiber 5. One end of the left and right ends of the equal-arm balance is provided with a sensor socket 11, and the other end is provided with a counterweight pan 12. A sensitivity adjusting screw 13 is provided below the counterweight pan 12. A sensitivity adjusting nut 14 is provided on the sensitivity adjusting screw 13. A sensitivity weight 15 is provided at the bottom of the sensitivity adjusting screw 13.

[0029] Specifically, the present device uses the suspension fiber 5 connected to the middle part of the equal-arm balance beam 10 to lift the equal-arm balance beam 10 to a suspended state. In this structure, when the equal-arm balance beam 10 is used for weighing measurement, the allowable inclination angle is smaller and the mil division is finer. Therefore, the measurement sensitivity is relatively high. The provided balance reeds 3 are used to support the suspension fiber 5 and the equal-arm balance beam 10 as a whole, and the balance reeds 3 have a certain vibration damping function, which can reduce the influence of external vibration on the measurement result and ensure the measurement accuracy.

[0030] When balancing the equal-arm balance beam 10, quick mechanical balancing can be carried out by adjusting the weights on the counterweight pan 12 at one end of the equal-arm balance beam 10. This balancing method is simple and convenient, and can achieve disassembly-free balancing.

[0031] As Figure 4 , Figure 5 and Figure 6As shown in the figure, the electromagnetic balance assembly includes a connecting rod 16, a diaphragm 17, a magnetic core seat 18, a permanent magnet core 19, a coil 20, a light-emitting diode 21, and a photosensitive triode 22. The connecting rod 16 is vertically fixed below the middle of the equal-arm balance beam 10 and extends downward into the installation cavity 2. A magnetic core seat 18 is provided on the connecting rod 16. A number of permanent magnet cores 19 that are symmetric about the central axis of the connecting rod 16 are provided on the magnetic core seat 18. Each permanent magnet core 19 is externally sleeved with a coil 20. The coil 20 is fixed on the balance base 1. A diaphragm 17 is provided at the bottom of the connecting rod 16. A vertical slit 23 is provided on the diaphragm 17. A light-emitting diode 21 is provided on one side in the thickness direction of the diaphragm 17, and a photosensitive triode 22 is provided on the other side. The light-emitting diode 21 and the photosensitive triode 22 are both fixed on the balance base 1. The photosensitive triode 22 is electrically connected to the coil 20.

[0032] Specifically, when an external DC power supply is connected, that is, when powered on, the balance beam always remains horizontal (zero position), and the connecting rod 16 below the middle line of the equal-arm balance beam 10 remains in a vertically downward state. In this case, the light emitted by the light-emitting diode 21 will be blocked by the diaphragm 17, and thus cannot pass through the slit 23 on the diaphragm 17 to be received by the photosensitive triode 22, suppressing the generation of current in the photosensitive triode 22.

[0033] When a physical quantity changes at one end of the equal-arm balance, the equal-arm balance beam 10 tilts towards one end, driving the lower diaphragm 17 to deflect. At this time, the light beam of the light-emitting diode 21 passes through the slit 23 on the diaphragm 17 and is received by the opposite photosensitive triode 22. The photosensitive triode 22 generates current after being illuminated, and the current direction is related to the tilting direction. The photosensitive triode 22 is connected to the coil 20 through an electric signal processing unit such as a regulator and an amplifier. Therefore, when the balance tilts, the current generated by the photosensitive triode 22 controls each coil 20 to generate electromagnetic force to keep the balance level again.

[0034] There is a definite mathematical relationship between the current in the coil 20 and the sample mass (the triode current is proportional to the current in the coil 20, the current in the coil 20 is proportional to the magnetic force, the magnetic force is proportional to the gravity, and the gravity is proportional to the mass). Therefore, by measuring the change in the current in the coil 20, the change in the sample mass can be measured.

[0035] Therefore, in this device, the slit 23 on the diaphragm 17 tilts, enabling the photosensitive triode 22 to capture the light sense and then adjusting the current in the coil 20 to generate magnetic force to pull the equal-arm balance beam 10 to quickly reach the balanced position. This equal-arm balance has higher sensitivity compared to the single-arm type, smaller overshoot during swinging, higher positioning and resetting accuracy. Moreover, this device has fewer combined parts, a simple structure, can effectively improve the machining accuracy of parts, the overall mechanism is integrated, the design is reasonable, the operation is simple, and the maintenance is convenient.

[0036] In a further setting, asFigure 5 and Figure 6 As shown in Figure 6 , a suspension wire pressing plate 6 is provided on the upper side of the equal-arm balance beam 10. The suspension wire 5 is threaded between the suspension wire pressing plate 6 and the equal-arm balance beam 10. The suspension wire pressing plate 6 is provided with bolt holes, and the equal-arm balance beam 10 is provided with screw holes. The bolt passes through the bolt hole and is in threaded cooperation with the screw hole. After tightening the bolt, the suspension wire pressing plate 6 can firmly press the suspension wire 5, so that the suspension wire 5 can lift the equal-arm balance beam 10.

[0037] As Figure 1 and Figure 2 shown, a support base 7 is provided on the balance spring leaf 3. The support base 7 is provided with a through hole 8. A support rod is provided in the through hole 8. The suspension wire 5 passes through the through hole 8 and is supported on the support rod and then is fixedly connected downward to the suspension wire mounting plate 4. Thus, it is convenient to support the suspension wire 5, and the suspension wire 5 is not easily worn.

[0038] As Figure 1 , Figure 2 and Figure 5 shown, the suspension wire mounting plate 4 is a thin metal plate. The suspension wire mounting plate 4 is provided with a support plate 9 that can be bent back and forth to adjust the angle. The support plate 9 is fixedly connected to the suspension wire 5. Thus, the tension of the suspension wire 5 can be adjusted by bending the support plate 9.

[0039] As Figure 4 and Figure 6 shown, on the left and right sides of the upper end of the balance base 1, a limit support column 24 and a limit rod 25 are respectively provided. On the left and right sides of the equal-arm balance beam 10, limit holes with a diameter larger than that of the limit rod 25 are respectively provided. The limit rods 25 on the left and right sides respectively pass upward through the corresponding limit holes. The limit support columns 24 on the left and right sides are located below the equal-arm balance beam 10. The provided limit support column 24 and limit rod 25 can limit the equal-arm balance beam 10 to a certain extent and prevent the equal-arm balance beam 10 from tilting excessively.

[0040] In summary, the main features of this device are as follows:

[0041] 1. This device uses the suspension wire 5 connected to the middle of the equal-arm balance beam 10 to lift the equal-arm balance beam 10 into a suspended state. In this structure, when the equal-arm balance beam 10 is used for weighing measurement, the allowable tilt angle is smaller and the mil division is finer. Therefore, the measurement sensitivity is relatively high;

[0042] 2. When balancing the equal-arm balance beam 10, rapid mechanical balancing can be carried out by adjusting the weights in the counterweight plate 12 at one end of the equal-arm balance beam 10 and adjusting the sensitivity nut 14 up and down. This balancing method is simple and convenient and can achieve non-dismantling balancing.

[0043] 3. In this device, the slit 23 on the aperture plate 17 is inclined so that the photosensitive triode 22 can capture the light sense, thereby adjusting the current of the coil 20 to generate magnetic force to pull the equal-arm balance beam 10 to quickly reach the equilibrium position. This equal-arm balance has higher sensitivity compared to the single-arm type, smaller overshoot during swinging, higher positioning and resetting accuracy. Moreover, this device has fewer combined parts and a simple structure, which can effectively improve the machining accuracy of components. The overall mechanism is integrally arranged, with reasonable design, simple operation, and convenient maintenance.

[0044] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An equal-arm upper dish type suspended wire photoelectric balance, characterized in that: include: A balance base, wherein the balance base is hollow inside to form a mounting cavity, and the mounting cavity runs through the balance base upwards, and balance springs are respectively arranged on the front and rear sides of the upper end of the balance base, and an angle-adjustable suspension wire mounting plate is arranged on the balance spring, and a suspension wire suspended above the mounting cavity is arranged between the two suspension wire mounting plates; An equal-arm balance beam, the equal-arm balance beam extends in the left-right direction, the middle part of the equal-arm balance beam is connected to the suspension wire, one end of the left and right ends of the equal-arm balance is provided with a sensor socket, the other end is provided with a counterweight plate, a sensing stud is provided below the counterweight plate, a sensing nut is provided on the sensing stud, and a sensing weight is provided at the bottom of the sensing stud; An electromagnetic balance component, the electromagnetic balance component includes a connecting rod, a light barrier, a core seat, a permanent magnetic core, a coil, a light emitting diode and a photosensitive transistor. The connecting rod is vertically fixed below the middle part of the equal-arm balance beam and extends downward into the installation cavity. The connecting rod is provided with the core seat, and the core seat is provided with a plurality of permanent magnetic cores that are symmetrical about the central axis of the connecting rod. Each of the permanent magnetic cores is jacketed with a coil, and the coil is fixed on the balance base. The bottom of the connecting rod is provided with the light barrier, and the light barrier is provided with a vertical slit. A light emitting diode is provided on one side of the light barrier in the thickness direction, and a photosensitive transistor is provided on the other side. The light emitting diode and the photosensitive transistor are both fixed on the balance base, and the photosensitive transistor is electrically connected to the coil.

2. The equal-arm dish-type suspended wire photoelectric balance according to claim 1, characterized in that: A suspension wire pressing plate is arranged on the upper side of the equal-arm balance crossbeam, and the suspension wire is passed through the suspension wire pressing plate and the equal-arm balance crossbeam.

3. The equal-arm dish-type suspended wire photoelectric balance according to claim 1, characterized in that: The balance spring sheet is provided with a support seat, the support seat is provided with a through hole, a support rod is provided in the through hole, the suspension wire passes through the through hole and is supported on the support rod and then is downwardly fixedly connected to the suspension wire mounting plate.

4. The equal-arm upper dish type suspended wire photoelectric balance according to claim 1, characterized in that: The suspension wire installation plate is a metal thin plate, and a support plate whose angle can be adjusted forward and backward is provided on the suspension wire installation plate, and the support plate is fixedly connected to the suspension wire.

5. The equal-arm upper dish type suspended wire photoelectric balance according to claim 1, characterized in that: A limit support column and a limit rod are respectively provided on the left and right sides of the upper end of the balance base, and a limit hole with a larger aperture than the limit rod is respectively provided on the left and right sides of the equal-arm balance beam, and the limit rods on the left and right sides are respectively passed upward into the corresponding limit holes, and the limit support columns on the left and right sides are located below the equal-arm balance beam.

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