Measurement calibration device of thermogravimetric analyzer

Abstract

The utility model discloses a thermogravimetric analyzer measurement calibration device, which comprises a zero calibration positioning block, a maximum measurement positioning block and a movable weight with correction, the movable weight with correction is sleeved on the right half part of a balance rod of a balance, and four parallel limiting slide bars are connected to four corners of opposite sides of the zero calibration positioning block and the maximum measurement positioning block. A correction bolt hole and a weight pointer are arranged on the front side of the movable weight with correction, a weighing disc assembly is arranged at the left side end of the balance rod, a right pushing assembly is arranged above the right half portion of the balance rod, a left pushing assembly is arranged below the right half portion of the balance rod, and a balance measuring metal block is arranged at the right end of the balance rod and located in a laterally-turned U-shaped block. A supporting rotating base is arranged in the middle of the balance rod. According to the utility model, the scale is convenient to replace in the correction process, the scale error can be conveniently and rapidly corrected, and the correction of the to-be-corrected moving weight can be realized by screwing the correction bolt with the corresponding weight into the correction bolt hole.

Description

Technical Field

[0001] The utility model relates to the technical field of thermogravimetric analyzers, in particular to a thermogravimetric analyzer measurement and calibration device. Background Art

[0002] The large-mass high-temperature thermogravimetric analyzer is a thermal analysis instrument that measures the mass (or weight) of a substance as it changes with temperature under the control of a microcomputer temperature program. At present, all test instruments for large-mass high-temperature thermogravimetric analysis use a balance for direct weighing. The balance is a precision measuring instrument. Long-term operation will reduce the accuracy of the balance and increase the error. Therefore, in order to prevent the thermogravimetric analysis data from errors due to reduced balance accuracy, the causes of the error are: 1. The mass of the scale pan changes. Since the scale pan is fixedly installed on the balance, it is troublesome to disassemble and replace; 2. The mobile weights on the balance have reduced accuracy after multiple movements, mainly due to wear and tear, and calibration is relatively troublesome and has low calibration accuracy. Disassembly for calibration is relatively troublesome. If calibration can be performed under the front cover, the calibration efficiency will be greatly improved. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the utility model is to provide a thermogravimetric analyzer measurement and calibration device to solve the problems of calibration trouble and low calibration accuracy.

[0004] A thermogravimetric analyzer measurement and calibration device according to the utility model comprises a zero calibration block, a maximum measurement block and a movable weight with correction, wherein the movable weight with correction is sleeved on the right half of the balance bar of the balance, the right half of the balance bar is provided with a zero calibration block at a middle position close to the balance bar, and a maximum measurement block is provided near the rightmost end, four parallel limit slide bars are connected at four corners on the opposite sides of the zero calibration block and the maximum measurement block, the movable weight with correction is movably sleeved on the four limit slide bars, a correction bolt hole and a weight pointer are provided on the front side of the movable weight with correction, a weighing pan assembly is provided at the left end of the balance bar, a right push assembly is provided above the right half of the balance bar, and a left push assembly is provided below, a balance measurement metal block is provided at the right end of the balance bar, the balance measurement metal block is located in a side-turned U-shaped block, two metal contact sheets are provided at the top and the bottom of the side-turned U-shaped block, and a supporting swivel is provided in the middle position of the balance bar.

[0005] In some embodiments of the utility model, the weighing pan assembly includes a ring and a weighing pan, one side of the ring is fixedly connected to the left end of the balance bar, two shaft rods are symmetrically provided on the inner side of the middle position of the ring, and circular grooves for holding the shaft rods are provided on the front and rear side walls of the weighing pan, and the bottoms of the left and right sides of the ring are provided with limit baffles extending toward the inner side of the ring.

[0006] In other embodiments of the utility model, the right push assembly includes a first servo motor, a first screw rod and a first push block, the rotating shaft of the first servo motor is connected to one end of the first screw rod, the other end of the first screw rod is sleeved with a bearing and fixed with a fixed block, the first push block is spirally sleeved on the first screw rod, both sides of the first push block are sleeved on the anti-rotation slide rod and the anti-rotation slide rod is parallel to the first screw rod, and a downward push rod is provided at the bottom of the first push block and the push rod is located on the left side with a correction movable weight.

[0007] In other embodiments of the utility model, the left push assembly includes a second servo motor, a second screw rod and a second push block, the rotating shaft of the second servo motor is connected to one end of the second screw rod, the other end of the second screw rod is sleeved with a bearing and fixed with a fixed block, the second push block is spirally sleeved on the second screw rod, both sides of the second push block are sleeved on the anti-rotation slide rod and the anti-rotation slide rod is parallel to the second screw rod, and an upward push rod is provided on the top of the second push block and the push rod is located on the right side with a correction movable weight.

[0008] In some other embodiments of the present invention, the balance measurement metal block is formed by attaching metal copper plates to the upper and lower surfaces of an insulating metal block.

[0009] In some other embodiments of the present invention, the movable weight with correction is screwed into the correction bolt hole for correction.

[0010] In the utility model, the scale pan can be easily replaced during the calibration process, and the scale pan error can be quickly calibrated. For calibration with a calibration movable weight, a calibration bolt of corresponding weight can be screwed into the calibration bolt hole to realize rapid calibration of the movable weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0012] Figure 1 The utility model provides a schematic cross-sectional structure diagram of a thermogravimetric analyzer measurement and calibration device.

[0013] Figure 2 The figure is a schematic diagram of the right half structure of the weighing balance proposed by the utility model.

[0014] Figure 3 This is a structural schematic diagram of the weighing pan position proposed by the utility model.

[0015] In the figure: 1. weighing pan; 11. shaft; 2. collar; 21. limit baffle; 3. balance bar; 31. support swivel; 4. weight correction module; 41. movable weight with correction; 411. correction bolt hole; 412. weight pointer; 42. zero calibration block; 43. maximum measurement block; 44. limit slide; 5. first servo motor; 51. first screw rod; 52. first push block; 6. second servo motor; 61. second screw rod; 62. second push block; 7. balance measurement metal block; 8. metal contact piece. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0017] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0018] Reference Figure 1-3 A thermogravimetric analyzer measurement and calibration device comprises a zero calibration block 42, a maximum measurement block 43 and a correction movable weight 41, wherein the correction movable weight 41 is sleeved on the right half of the balance bar 3 of the balance, wherein the right half of the balance bar 3 is provided with a zero calibration block 42 at a middle position close to the balance bar 3 and a maximum measurement block 43 at a rightmost position, wherein four parallel limit sliding bars 44 are connected at four corners on the opposite sides of the zero calibration block 42 and the maximum measurement block 43, wherein the correction movable weight 41 is sleeved on the right half of the balance bar 3, wherein the zero calibration block 42 is provided at a middle position close to the balance bar 3 and a maximum measurement block 43 is provided at a rightmost position, wherein four parallel limit sliding bars 44 are connected at four corners on the opposite sides of the zero calibration block 42 and the maximum measurement block 43, wherein the correction movable weight 41 is sleeved on the right half of the balance bar 3 The movable sleeve is on four limit sliding bars 44, and the front side of the movable weight 41 with correction is provided with a correction bolt hole 411 and a weight pointer 412, and the left end of the balance bar 3 is provided with a weighing plate assembly, and the upper right half of the balance bar 3 is provided with a right push assembly, and the lower right half is provided with a left push assembly, and the right end of the balance bar 3 is provided with a balance measurement metal block 7, and the balance measurement metal block 7 is located in the overturned U-shaped block, and the top and bottom of the overturned U-shaped block are provided with two metal contact pieces 8, and the middle position of the balance bar 3 is provided with a supporting swivel seat 31.

[0019] The zeroing positioning block 42 and the maximum measurement positioning block 43 can not only limit the measuring range, but also, during calibration, when the movable weight 41 with correction is attached to the zeroing positioning block 42, it is the zeroing position. If it is not the balance point, it indicates that there is an error in the balance. Generally, the weight of the movable weight 41 with correction is reduced due to wear, and the weight needs to be increased. Even if there is an error in the movable weight 41 with correction, the distance moved to the right from the zeroing positioning block 42 reaches balance, which is the lost weight. The lost weight is determined by the distance moved to the right. The bolt is prepared for the lost weight in a special way and can be screwed into the correction bolt hole 411 for calibration (the load-bearing plate has no error at this time).

[0020] If both the load-bearing pan and the movable weight 41 with correction have errors, the judgment method is: when calibrating, directly replace an accurate weighing pan 1 to see whether the movable weight 41 with correction is balanced on the zeroing positioning block 42. If it is unbalanced, perform correction. After the calibration is completed, replace the old one. If it is balanced, it means that the old one is still relatively accurate. If it is unbalanced, replace it with a new balanced weighing pan.

[0021] The weighing pan assembly includes a collar 2 and a weighing pan 1, one side of the collar 2 is fixedly connected to the left end of the balance bar 3, two shafts 11 are symmetrically arranged on the inner side of the middle position of the collar 2, and circular grooves for enclosing the shafts 11 are arranged on the front and rear side walls of the weighing pan 1, and limit baffles 21 extending toward the inner side of the collar are arranged on the bottom of the left and right sides of the collar 2.

[0022] Method for replacing the weighing pan 1: pull the front and rear of the collar 2 outward, and the weighing pan 1 will be out of the shaft 11. The limit stopper 21 can prevent the weighing pan 1 from turning over.

[0023] The right push assembly includes a first servo motor 5, a first screw rod 51 and a first push block 52, the rotating shaft of the first servo motor 5 is connected to one end of the first screw rod 51, the other end of the first screw rod 51 is sleeved with a bearing and fixed with a fixing block, the first push block 52 is spirally sleeved on the first screw rod 51, the two sides of the first push block 52 are sleeved on the anti-rotation slide rod and the anti-rotation slide rod is parallel to the first screw rod 51, and a downward push rod is provided at the bottom of the first push block 52 and the push rod is on the left side of the correction moving weight 41.

[0024] The first servo motor 5 drives the first screw rod 51 to rotate slightly, thereby pushing the first push block 52 to move rightward. The push rod thereon will slowly push the movable weight 41 with correction to move rightward. When the balance measuring metal block 7 just leaves the two metal contact pieces 8 above, it indicates that the balance has begun. At this time, stop pushing and the balance is balanced.

[0025] The left push assembly includes a second servo motor 6, a second screw rod 61 and a second push block 62, the rotating shaft of the second servo motor 6 is connected to one end of the second screw rod 61, the other end of the second screw rod 61 is sleeved with a bearing and fixed with a fixing block, the second push block 62 is spirally sleeved on the second screw rod 61, the two sides of the second push block 62 are sleeved on the anti-rotation slide bar and the anti-rotation slide bar is parallel to the second screw rod 61, and the top of the second push block 62 is provided with an upward push rod and the push rod is located on the right side of the correction moving weight 41.

[0026] After a test is completed, the first push block 52 is pushed to the initial position. At this time, the belt correction moving weight 41 needs to be moved to the zero position. The second servo motor 6 drives the second screw 61 to rotate, thereby pushing the second push block 62 to move, and the push rod on it pushes the belt correction moving weight 41 to move to the zero position. Wait for the next measurement.

[0027] When the first servo motor 5 pushes the first push block 52 too much, the second servo motor 6 can also be used for reverse fine adjustment.

[0028] The balance measurement metal block 7 is formed by attaching metal copper plates to the upper and lower surfaces of an insulating metal block.

[0029] The metal copper plate is used to conduct the two metal contact pieces 8 so as to start the corresponding servo motor. The servo motor is started only when the metal copper plate conducts the two metal contact pieces 8 when starting the measurement. If the servo motor is not started for the measurement, it will not work.

[0030] The movable weight 41 with calibration is screwed into the calibration bolt hole 411 for calibration. The bolts are the same size of the bolt part, but the size of the nut position is different, and different bolts are made of different materials for more accurate calibration.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A thermogravimetric analyzer measurement and calibration device, characterized in that: The invention comprises a zero calibration block (42), a maximum measurement block (43) and a movable weight (41) with correction, wherein the movable weight (41) with correction is sleeved on the right half of the balance bar (3) of the balance, the right half of the balance bar (3) is provided with a zero calibration block (42) at a middle position close to the balance bar (3), and a maximum measurement block (43) is provided at a rightmost position close to the balance bar (3), four parallel limit slide bars (44) are connected at four corners on the opposite sides of the zero calibration block (42) and the maximum measurement block (43), and the movable weight (41) with correction is sleeved on the four limit slide bars. The movable weight (41) with correction is provided with a correction bolt hole (411) and a weight pointer (412) on the front side, the left end of the balance bar (3) is provided with a weighing plate assembly, the right half of the balance bar (3) is provided with a right push assembly on the upper side and a left push assembly on the lower side, the right end of the balance bar (3) is provided with a balance measurement metal block (7), the balance measurement metal block (7) is located in the overturned U-shaped block, the top and bottom of the overturned U-shaped block are provided with two metal contact sheets (8), and the middle position of the balance bar (3) is provided with a support swivel seat (31).

2. A thermogravimetric analyzer measurement and calibration device according to claim 1, characterized in that: The weighing pan assembly comprises a collar (2) and a weighing pan (1), one side of the collar (2) being fixedly connected to the left end of a balance bar (3), two shafts (11) being symmetrically arranged front and back on the inner side of the middle position of the collar (2), front and rear side walls of the weighing pan (1) being provided with circular grooves for enclosing the shafts (11), and the bottoms of the left and right sides of the collar (2) being provided with limit baffles (21) extending toward the inner side of the collar.

3. A thermogravimetric analyzer measurement and calibration device according to claim 1, characterized in that: The right push assembly comprises a first servo motor (5), a first screw rod (51) and a first push block (52); the rotating shaft of the first servo motor (5) is connected to one end of the first screw rod (51); the other end of the first screw rod (51) is sleeved with a bearing and fixed by a fixing block; the first push block (52) is spirally sleeved on the first screw rod (51); both sides of the first push block (52) are sleeved on the anti-rotation slide rod and the anti-rotation slide rod is parallel to the first screw rod (51); a downward push rod is provided at the bottom of the first push block (52) and the push rod is located on the left side of the correction moving weight (41).

4. A thermogravimetric analyzer measurement and calibration device according to claim 1, characterized in that: The left push assembly comprises a second servo motor (6), a second screw rod (61) and a second push block (62); the rotating shaft of the second servo motor (6) is connected to one end of the second screw rod (61); the other end of the second screw rod (61) is sleeved with a bearing and fixed by a fixing block; the second push block (62) is spirally sleeved on the second screw rod (61); both sides of the second push block (62) are sleeved on the anti-rotation slide rod and the anti-rotation slide rod is parallel to the second screw rod (61); the top of the second push block (62) is provided with an upward push rod and the push rod is located on the right side of the correction moving weight (41).

5. A thermogravimetric analyzer measurement and calibration device according to claim 1, characterized in that: The balance measurement metal block (7) is formed by attaching metal copper plates to the upper and lower surfaces of an insulating metal block.

6. A thermogravimetric analyzer measurement and calibration device according to claim 1, characterized in that: The movable weight (41) with correction is screwed into the correction bolt hole (411) for correction.

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