High-precision frame disc balance

Abstract

The utility model belongs to the technical field of measuring instruments, and discloses a high-precision frame-plate balance, which comprises a base, a telescopic unit, a support rod, a reading unit and a balance unit, the center of the balance unit is in shaft connection with the support rod through a first rotating shaft, the balance unit is a measuring part of the balance, and the support rod is connected with the base through the telescopic unit. The telescopic unit is provided with a vertical moving structure based on threads. The reading unit is connected with the first rotating shaft and provides reading. According to the utility model, the driven gear is arranged to drive the pointer to do circular motion, the whole arc is used for measurement, the accuracy of the balance is enhanced, the threaded pipe is in threaded connection with the threaded rod, the effect of lifting the balance is achieved, and the height of the balance can be adjusted according to actual conditions. And the problem of reading error caused by height is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of measuring instrument technology and relates to a high-precision pan balance. Background Technology

[0002] A balance, a traditional weighing instrument, consists of a beam supported by a fulcrum (axis) at its center, forming two arms. Each arm holds a pan; one pan contains an object of known mass, and the other contains the object to be measured. The deflection of a pointer fixed to the beam, pointing directly to the center mark, indicates the mass of the object being measured. Modern balances are increasingly precise and sensitive, and come in a wider variety of types. Currently, there are ordinary balances, analytical balances, constant-mass analytical balances, micro-analytical balances, and semi-micro-analytical balances, among others.

[0003] Currently, most balance pointers are semi-circular in shape and their height is usually fixed. The measurement range of a semi-circular arc is limited and the accuracy is not high. When weighing at a fixed height, the reading angle will cause errors, which greatly reduces the functionality of the balance. Therefore, a new type of high-precision balance is needed. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a high-precision pan balance, which solves the issues of inaccurate semi-circular arc measurements and reading errors caused by height in ordinary balances.

[0005] The technical solution of the utility model is as follows:

[0006] A high-precision pan balance includes a base, a telescopic unit, a support rod, a reading unit, and a balancing unit. The center of the balancing unit is connected to the support rod shaft via a first rotating shaft. The balancing unit is the measuring part of the balance. The support rod is connected to the base via the telescopic unit, which has a threaded up-and-down movement structure. The reading unit is connected to the first rotating shaft and provides a reading.

[0007] Furthermore, the telescopic unit includes a first bearing, a threaded tube, and a threaded rod. The threaded rod is fixed on the base, and the threaded tube and the threaded rod are engaged by internal and external threads. A support rod is connected to the top of the threaded tube. The first bearing is installed between the radial outer side of the threaded tube and the base.

[0008] Furthermore, it also includes a telescopic tube and a telescopic rod. The telescopic tube is fixed on the base and is a straight tube that opens upwards. The telescopic rod is inserted into the telescopic tube and its upper end is connected to the support rod.

[0009] Furthermore, a level is fixed to the front of the base.

[0010] Furthermore, the balancing unit includes a crossbeam, with both ends of the crossbeam connected to a hanging platform via suspension rods. The crossbeam is equipped with a scale and adjusting nuts. The suspension rods are of rigid construction.

[0011] Furthermore, the reading unit includes a driving gear, a second rotating shaft, a driven gear, a pointer, and a dial. The dial is fixed to the top of the support rod. The driving gear is coaxially and fixedly connected to the first rotating shaft. The driven gear meshes with the driving gear. The driven gear and the pointer are coaxially and fixedly connected through the second rotating shaft. The pointer is located inside the dial.

[0012] Furthermore, the ratio of the number of teeth of the driving gear to the number of teeth of the driven gear shall not be less than 10 to 1.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. This utility model uses a driven gear to drive the pointer in a circular motion, thereby achieving measurement using the entire arc and enhancing the accuracy of the balance. By setting a threaded connection between the threaded tube and the threaded rod, the balance can be raised and lowered, and the height of the balance can be adjusted according to the actual situation to avoid reading errors caused by height.

[0015] 2. This utility model, by setting the ratio of the number of teeth of the driving gear to the driven gear to be no less than 10:1, enables the driven gear to complete a full circumference rotation, thereby enhancing the accuracy of the balance. By setting the sliding connection between the telescopic tube and the telescopic rod, the stability of the balance can be effectively improved. By setting the threaded connection between the adjusting rod and the adjusting hole, the levelness of the base can be effectively adjusted. By setting the second and third bearings, the friction between the first and second rotating shafts can be effectively reduced, thereby enhancing the measurement accuracy of the balance. Thus, it effectively solves the problems of inaccurate semi-circular arc measurement and reading errors caused by height in ordinary balances. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model patent, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model patent, and therefore should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the scale structure of this utility model.

[0019] In the diagram: 1. Base, 2. First bearing, 3. Threaded pipe, 4. Threaded rod, 5. Support rod, 6. Telescopic pipe, 7. Telescopic rod, 8. Connecting block, 9. Second bearing, 10. Third bearing, 11. First shaft, 12. Drive gear, 13. Second shaft, 14. Driven gear, 15. Crossbeam, 16. Hanging rod, 17. Hanging plate, 18. Pointer, 19. Dial, 20. Adjusting hole, 21. Adjusting rod, 22. Adjusting foot, 23. Level, 24. Dial, 25. Adjusting nut, 26. Weight. Detailed Implementation

[0020] This section describes embodiments of the present invention, used to explain and illustrate the technical solutions of the present invention. Unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are for the purpose of facilitating and simplifying the description of this utility model, and do not indicate or imply that the device or device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include more than one of those features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Example 1:

[0024] A high-precision pan balance includes a base 1, a telescopic unit, a support rod 5, a reading unit, and a balancing unit. The center of the balancing unit is connected to the support rod 5 via a first rotating shaft 11. The balancing unit is the measuring part of the balance. The support rod 5 is connected to the base 1 via the telescopic unit, which has a threaded up-and-down movement structure. The reading unit is connected to the first rotating shaft 11 and provides a reading.

[0025] The telescopic unit includes a first bearing 2, a threaded tube 3, and a threaded rod 4. The threaded rod 4 is fixed on the base 1. The threaded tube 3 and the threaded rod 4 are connected by internal and external threads. The top of the threaded tube 3 is connected to a support rod 5. The first bearing 2 is set between the radial outer side of the threaded tube 3 and the base 1.

[0026] It also includes a telescopic tube 6 and a telescopic rod 7. The telescopic tube 6 is fixed on the base 1. The telescopic tube 6 is a straight tube that opens upwards. The telescopic rod 7 is inserted into the telescopic tube 6. The upper end of the telescopic rod 7 is connected to the support rod 5.

[0027] A level 23 is also fixed to the front of the base 1.

[0028] The balancing unit includes a crossbeam 15, with both ends of the crossbeam 15 connected to a hanging platform 17 via suspension rods 16. The crossbeam 15 is equipped with a scale 24 and an adjusting nut 25. The suspension rods 16 are of rigid structure.

[0029] The reading unit includes a driving gear 12, a second rotating shaft 13, a driven gear 14, a pointer 18, and a dial 19. The dial 19 is fixed to the top of the support rod 5. The driving gear 12 is coaxially and fixedly connected to the first rotating shaft 11. The driven gear 14 meshes with the driving gear 12. The driven gear 14 and the pointer 18 are coaxially and fixedly connected through the second rotating shaft 13. The pointer 18 is located inside the dial 19.

[0030] The ratio of the number of teeth of the driving gear 12 to the number of teeth of the driven gear 14 is not less than 10 to 1.

[0031] Example 2:

[0032] This utility model discloses a novel balance, including a base. A first bearing is fixedly connected inside the base, and a threaded tube is fixedly connected to the inner ring of the first bearing. A threaded rod is threadedly connected inside the threaded tube, and a support rod is fixedly connected to the top of the threaded rod. A telescopic tube is fixedly connected to the upper surface of the base, and a telescopic rod is slidably connected inside the telescopic tube. A connecting block is fixedly connected to the top of the telescopic rod, and one side of the connecting block is fixedly connected to the support rod. This novel balance achieves measurement using the entire arc, enhancing the balance's accuracy. It also allows for height adjustment, preventing reading errors caused by height. Furthermore, it enables the driven gear to complete a full circumference rotation, further enhancing the balance's accuracy. It effectively avoids circumferential rotation of the threaded rod, thus effectively solving the problems of inaccurate semi-circular arc measurements and reading errors caused by height in ordinary balances.

[0033] Please see Figure 1-2. This utility model provides a technical solution: a novel balance, including a base 1, with an adjustment hole 20 at the bottom of the base 1. An adjustment rod 21 is threadedly connected to the inside of the adjustment hole 20. By setting the adjustment rod 21 to be threadedly connected to the adjustment hole 20, the levelness of the base 1 can be effectively adjusted. An adjustment foot 22 is fixedly connected to the bottom of the adjustment rod 21. The bottom of the adjustment foot 22 is conical to enhance the stability of the balance and facilitate the rotation of the adjustment foot 22. A level 23 is fixedly connected to the front of the base 1. The length of the level 23 is two-thirds of the length of the base 1, which can effectively be used to observe and measure the levelness of the base 1. The inner... The base 1 is fixedly connected to a first bearing 2. The inner ring of the first bearing 2 is fixedly connected to a threaded tube 3. The threaded tube 3 is internally connected to a threaded rod 4. By setting the threaded connection between the threaded tube 3 and the threaded rod 4, the balance can be raised and lowered. The height of the balance can be adjusted according to the actual situation to avoid reading errors caused by height. The top of the threaded rod 4 is fixedly connected to a support rod 5. The upper surface of the base 1 is fixedly connected to a telescopic tube 6. The telescopic tube 6 is internally connected to a telescopic rod 7. By setting the sliding connection between the telescopic tube 6 and the telescopic rod 7, the stability of the balance can be effectively guaranteed. The top of the telescopic rod 7 is fixedly connected to a connecting block 8. One side of the connecting block 8 is fixedly connected to the support rod 5.

[0034] The support rod 5 has a second bearing 9 and a third bearing 10 fixedly connected inside. By setting the second bearing 9 and the third bearing 10, the friction between the first rotating shaft 11 and the second rotating shaft 13 can be effectively reduced, thereby enhancing the measurement accuracy of the balance. The inner ring of the second bearing 9 is fixedly connected to the first rotating shaft 11, and the surface of the first rotating shaft 11 is fixedly connected to the driving gear 12. The inner ring of the third bearing 10 is fixedly connected to the second rotating shaft 13, and the surface of the second rotating shaft 13 is fixedly connected to the driven gear 14. By setting the driven gear 14 to drive the pointer 18 to make a circular motion, the entire arc is used for measurement, thereby enhancing the accuracy of the balance. The driven gear 14 meshes with the driving gear 12, and the gear ratio between the driving gear 12 and the driven gear 14 is not less than 10:1. By setting the gear ratio between the driving gear 12 and the driven gear 14 to be not less than 10:1, the driven gear 14 can make a complete circular rotation, thereby enhancing the accuracy of the balance.

[0035] A crossbeam 15 is fixedly connected to one end of the first rotating shaft 11. A scale 24 is provided on the surface of the crossbeam 15. An adjusting nut 25 is threadedly connected to one end of the crossbeam 15, which can be precisely adjusted. Both ends of the crossbeam are hinged to a lifting rod 16 by a pin. A hanging pan 17 is fixedly connected to the bottom of the lifting rod 16. Weights 26 are fitted onto the upper surface of the hanging pan 17 to increase the range of the balance. A pointer 18 is fixedly connected to one end of the second rotating shaft 13. A scale 19 is fixedly connected to the top of the support rod 5 for easy reading. This effectively solves the problems of inaccurate semi-circular arc measurement and reading errors caused by height in ordinary balances.

[0036] Working principle: During operation, the base is placed on the measuring platform. Observe the level ruler 23 and adjust the levelness. Rotate the adjusting foot 22, which drives the adjusting rod 21 to rotate within the adjusting hole 20. The base 1 moves up and down. After adjustment, adjust the height by rotating the threaded tube 3. The threaded tube 3 rotates within the first bearing 2. The threaded connection of the threaded tube 3 drives the threaded rod 4 to move up and down, and the telescopic rod 7 moves up and down within the telescopic tube 6. After the height is adjusted, during measurement, after determining the range, the balance is adjusted by using weights 26. The measuring object is placed in the hanging pan 17. The hanging pan 17 drives the hanging rod 16 to rotate at one end of the crossbeam 15. The crossbeam 15 drives the first rotating shaft 11 to rotate in the second bearing 9. The first rotating shaft 11 drives the driving gear 12 to rotate. The driving gear 12 drives the driven gear 14 to rotate. The driven gear 14 drives the second rotating shaft 13 to rotate in the third bearing 10. At the same time, the second rotating shaft 13 drives the pointer 18 to rotate. The balance is finely adjusted by adjusting the nut 25. The scale 19 measures the rotation value of the pointer 18.

[0037] In summary, this new type of balance achieves the effect of raising and lowering the balance by setting the threaded tube 3 and the threaded rod 4 for threaded connection. The height of the balance can be adjusted according to the actual situation, avoiding the problem of reading error caused by height. By setting the driven gear 14 to drive the pointer 18 to make circular motion, the entire arc is used for measurement, which enhances the accuracy of the balance. By setting the gear ratio of the driving gear 12 to the driven gear 14 to be no less than 10:1, the driven gear 14 can make a full circle rotation, which enhances the accuracy of the balance. Thus, it effectively solves the problems of inaccurate semi-circular arc measurement and reading error caused by height in ordinary balances.

Claims

1. A high-precision pan balance, characterized in that, It includes a base (1), a telescopic unit, a support rod (5), a reading unit, and a balancing unit. The center of the balancing unit is connected to the support rod (5) via a first rotating shaft (11). The balancing unit is the measuring part of the balance. The support rod (5) is connected to the base (1) via the telescopic unit. The telescopic unit has a thread-based up-and-down movement structure. The reading unit is connected to the first rotating shaft (11) and provides a reading.

2. The high-precision pan balance according to claim 1, characterized in that, The telescopic unit includes a first bearing (2), a threaded tube (3) and a threaded rod (4). The threaded rod (4) is fixed on the base (1). The threaded tube (3) and the threaded rod (4) are connected by internal and external threads. The top of the threaded tube (3) is connected to a support rod (5). The first bearing (2) is set between the radial outer side of the threaded tube (3) and the base (1).

3. A high-precision pan balance according to claim 2, characterized in that, It also includes a telescopic tube (6) and a telescopic rod (7). The telescopic tube (6) is fixed on the base (1). The telescopic tube (6) is a tube that opens straight upwards. The telescopic rod (7) is inserted into the telescopic tube (6). The upper end of the telescopic rod (7) is connected to the support rod (5).

4. A high-precision pan balance according to claim 1, characterized in that, A level (23) is also fixed to the front of the base (1).

5. A high-precision pan balance according to claim 1, characterized in that, The balancing unit includes a crossbeam (15), with the two ends of the crossbeam (15) connected to the hanging plate (17) via a hanger rod (16). The crossbeam (15) is equipped with a scale (24) and an adjusting nut (25).

6. A high-precision pan balance according to claim 5, characterized in that, The hanger (16) is a rigid structure.

7. A high-precision pan balance according to claim 1, characterized in that, The reading unit includes a driving gear (12), a second rotating shaft (13), a driven gear (14), a pointer (18), and a dial (19). The dial (19) is fixed on the top of the support rod (5). The driving gear (12) is coaxially fixedly connected to the first rotating shaft (11). The driven gear (14) meshes with the driving gear (12). The driven gear (14) and the pointer (18) are coaxially fixedly connected through the second rotating shaft (13). The pointer (18) is located inside the dial (19).

8. A high-precision pan balance according to claim 7, characterized in that, The ratio of the number of teeth of the driving gear (12) to the number of teeth of the driven gear (14) is not less than 10 to 1.

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