CN110553712A - Calibration device and calibration method suitable for mass comparator - Google Patents
Calibration device and calibration method suitable for mass comparator Download PDFInfo
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- CN110553712A CN110553712A CN201910780760.1A CN201910780760A CN110553712A CN 110553712 A CN110553712 A CN 110553712A CN 201910780760 A CN201910780760 A CN 201910780760A CN 110553712 A CN110553712 A CN 110553712A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/01—Testing or calibrating of weighing apparatus
- G01G23/012—Testing or calibrating of weighing apparatus with load cells comprising in-build calibration weights
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Abstract
The invention discloses a calibration device and a calibration method suitable for a mass comparator, belonging to the technical field of metrological verification. The calibration device disclosed by the invention is simple in structure, simple, convenient and quick in operation method, capable of effectively improving the stability of the mass comparator in the calibration process, reducing the workload of manual operation in the calibration process, reducing errors introduced in the process of manually taking and placing weights, improving the calibration efficiency and precision of the mass comparator, and having better application prospect and popularization value.
Description
Technical Field
the invention belongs to the technical field of metrological verification, and particularly relates to a calibration device and a calibration method suitable for a quality comparator.
Background
The mass comparator is used as the most important corollary equipment of a weight magnitude value transmission system and is widely applied to various metering technical mechanisms. In general, a mass comparator measures a mass difference value based on a cycle method of ABA or ABBA, and is a high-resolution electronic weighing device using a weighing method of adding a balance to a full-scale or electronic weighing range.
in the verification work of the weight, the indication repeatability, the unbalance loading error and the local indication error of the mass comparator are often important factors influencing the verification result of the weight. Therefore, the mass comparator usually has to perform processes such as repetitive calibration, offset calibration, and indication error calibration before weight verification.
with the formulation of JJF 1326-. However, most of the calibration methods of the current quality comparators are performed by manual calibration, which can meet the calibration requirements of the quality comparators to some extent, but have obvious defects, mainly as follows:
1. because the calibration process of the mass comparator is usually carried out based on an ABA or ABBA circulating mode, the times of picking and placing the weight are more, and the weight of the weight is usually larger and is generally 10-50 kg. For example, in the process of repeatedly calibrating the mass comparator, the measurement mode of the ABBA is usually adopted, and the number of the groups in the cycle is generally not less than 6 times, usually 10 times, so that the weight taking-placing operation needs to be carried out for 80 times; if the manual calibration mode is adopted to carry out the process, a large amount of manual labor is inevitably needed, the labor cost is greatly increased, and the calibration efficiency cannot be effectively guaranteed.
2. when manual calibration is used, the calibration result is often greatly influenced by subjective factors such as personnel experience, operation level and the like, the situation that the weight can be placed consistently every time cannot be effectively guaranteed, and especially when the weight is weak after being taken and placed for many times by an operator, the calibration result is greatly artificially deviated, and the uncertainty of the measurement result transmitted by the weight value is influenced;
3. when the weights are taken and placed manually, particularly when the weights need to be taken and placed in large quantities and multiple times, the collision of the weights is inevitable, the mass of the weights is greatly influenced by the collision of the weights, and the accuracy of a calibration result is obviously influenced by uncertainty caused by the change of the mass of the weights under the condition of extremely high requirement on calibration precision;
4. when weights are placed on the mass comparator manually, the impact born by the mass comparator every time is different often, and the impact born by the mass comparator every time is larger, so that the data display of the mass comparator has obvious data drift, and the accuracy of weight quantity value transmission is influenced;
in addition, when calibration is performed manually at present, the calibration accuracy is mostly influenced by environmental factors such as external temperature, humidity and wind power, and the factors are difficult to be accurately controlled and also influence the calibration accuracy of the quality comparator. Moreover, during manual calibration, the mass comparator is often directly placed on the test bed without being fixed, and under the condition that the weights are taken and placed and collide with each other, the mass comparator also has the risk of displacement, which also has certain influence on the accuracy of the calibration result.
based on the above reasons, it is obvious that the existing manual calibration method for the quality comparator has obvious defects, cannot fully and effectively meet the calibration requirement of the quality comparator, and has obvious limitations.
Disclosure of Invention
aiming at one or more of the defects or the improvement requirements of the prior art, the invention provides the calibration device suitable for the mass comparator and the calibration method thereof, which can accurately and automatically realize the picking and placing of the weights in the calibration process of the mass comparator, reduce the manpower workload and the manpower cost during manual calibration and improve the calibration efficiency and the calibration accuracy of the mass comparator.
in order to achieve the above object, in one aspect of the present invention, a calibration apparatus suitable for a mass comparator is provided, which includes a frame composed of a support frame and a working platform, and is characterized by further including a test bench, and an X-axis assembly, a Y-axis assembly, and a Z-axis assembly disposed on the working platform;
The test bed comprises a bed body which is arranged in the support frame and is of a blocky structure, the bottom surface of the bed body is fixed on the ground, the top surface of the bed body is always horizontal, a through hole which penetrates through two end surfaces and has a certain size is formed in the middle of the working platform corresponding to the top surface of the bed body, namely a limiting hole is formed in the middle of the working platform and used for limiting the mass comparator, and a limiting part is arranged on the top surface of the bed body, which is vertically opposite to the limiting hole, and used for limiting the mass comparator;
the Y-axis assembly comprises Y-axis slide rails which are arranged on two sides of the limiting hole in parallel, the Y-axis slide rails are fixed on the working platform, and a support capable of axially sliding back and forth along the Y-axis slide rails is arranged on each Y-axis slide rail; the X-axis assembly is arranged at the tops of the two supports and comprises an X-axis slide rail and a slide block, wherein two ends of the X-axis slide rail are respectively fixed at the tops of the two supports, and the slide block is arranged on the X-axis slide rail and can axially slide along the X-axis slide rail in a reciprocating manner; the Z-axis assembly comprises a Z-axis motor fixedly arranged at the bottom of the sliding block, the end part of an output shaft of the Z-axis motor faces downwards and can stretch and retract in a reciprocating manner along the vertical direction, and a clamp is arranged at the end part of the output shaft of the Z-axis motor;
Meanwhile, a weight library is arranged on a working platform on at least one side of the limiting hole along the axial direction of the Y-axis sliding rail, a plurality of weights can be contained in the weight library, the clamp can be driven by the combination of the X-axis assembly, the Y-axis assembly and the Z-axis assembly to align to the weights, and the clamp can be clamped to a mass comparator limited in the limiting hole.
As a further improvement of the invention, an X-axis motor which can drive the sliding block to reciprocate is arranged corresponding to the sliding block, and a Y-axis motor which can drive the supports to reciprocate is arranged corresponding to the two supports.
as a further improvement of the invention, the electric control box is further included, and the electric control box is respectively and electrically connected with the X-axis motor, the Y-axis motor and the Z-axis motor and is used for respectively controlling the motors to work.
As a further improvement of the invention, the weight storehouses are two weight storehouses which are respectively arranged at two sides of the limiting hole along the axial direction of the Y-axis sliding rail.
as a further improvement of the invention, the clamp is of a horizontal plate-shaped structure, the middle part of the clamp is correspondingly connected with the output shaft of the Z-axis motor, and the two side end parts of the clamp along the axial direction of the Y-axis slide rail are respectively provided with a C-shaped notch which can be matched with the arc-shaped ring groove at the top of the weight.
as a further improvement of the invention, a sealing cover is arranged on the top surface of the working platform and can cover all parts above the top surface of the working platform.
In another aspect of the present invention, a calibration method for a mass comparator is provided, which is implemented by using the calibration apparatus for a mass comparator, and the calibration method comprises the following steps:
S1: limiting and fixing a mass comparator to be calibrated on the test bed, and placing a corresponding standard weight in the weight library;
S2: acquiring data required by the quality comparator for repetitive calibration by using the calibration device, and performing repetitive calibration;
S3: acquiring data required by the mass comparator for offset load calibration by using the calibration device, and performing offset load calibration;
S4: acquiring data required by the quality comparator for local indicating value error calibration by using the calibration device, and performing local indicating value error calibration;
s5: and finishing the calibration of the quality comparator to be calibrated.
As a further improvement of the present invention, in step S2, the data required for the repetitive calibration is obtained by the following procedure:
s21: controlling the bracket and the sliding block to cooperatively move, and adjusting the height of the clamp by the Z-axis motor, so that the clamp moves to the weight storage and clamps the corresponding weight A;
S22: controlling an X/Y/Z shaft assembly to drive the weight A to be right above the mass comparator;
S23, controlling the clamp to descend, placing the weight A on the mass comparator, separating the clamp from the weight A and recording the indicating value I A1;
S24, clamping the weight A and putting back to the weight library, clamping a weight B with the same mass as the weight A onto the mass comparator, and recording the indicating value I B1;
S25, vertically lifting the weight B after being clamped by the clamp to a certain height, pausing for a certain time, putting the weight B back after the numerical value of the mass comparator is stable, and recording the indicating value I B2;
S26, clamping the weight B and putting back to the weight library, clamping the weight A to the mass comparator, and recording an indication value I A2 at the moment to obtain a group of repeated calibration data;
s27: and circulating the steps S21-S26 for a plurality of times to obtain other sets of repeated calibration data.
As a further improvement of the present invention, in step S3, the data required for offset calibration includes scale front data, scale rear data, scale left data, and scale right data, and the data is obtained by:
s31: controlling the bracket and the sliding block to cooperatively move, and adjusting the height of the clamp by the Z-axis motor, so that the clamp moves to the weight storage and clamps the corresponding weight C;
S32: controlling an X/Y/Z shaft assembly to drive the weight C to be right above the center of a scale pan of the mass comparator;
S33: controlling the clamp to descend to enable the weight C to be placed in the center of a scale pan of the mass comparator, separating the clamp from the weight C and recording the indicating value I at the momentIn 1；
s34: controlling the clamp to clamp and lift the weight C and then placing the weight C at the front part of a scale pan of the mass comparator, and recording the indicating value I at the momentFront 1；
s35: controlling the clamp to clamp the weight C and then erectlifting to a certain height, pausing for a certain time, returning the weight C to the front part of the scale pan after the numerical value of the mass comparator is stable, and recording the indicating value I at the momentfront 2；
s36: controlling the clamp to clamp and lift the weight C and then placing the weight C in the middle of a scale pan of the mass comparator, and recording the indicating value I at the momentIn 2thereby obtaining the scale front data;
S37: the steps S31 to S36 are repeated three times, and the position where the weight C is placed in steps S34 and S35 is replaced from the front of the scale pan to the rear of the scale pan, the left of the scale pan, and the right of the scale pan in each cycle, thereby obtaining the rear of the scale pan data, the left of the scale pan data, and the right of the scale pan data.
As a further improvement of the present invention, in step S4, the data required for the local registration error calibration is obtained by:
S41: controlling the bracket and the sliding block to cooperatively move, and adjusting the height of the clamp by the Z-axis motor, so that the clamp moves to the weight storage and clamps the corresponding weight D;
S42: controlling an X/Y/Z shaft assembly to drive the weight D to be right above the mass comparator;
s43, controlling the clamp to descend, placing the weight D on the mass comparator, separating the clamp from the weight D and recording the indicating value I D1;
S44, vertically lifting the weight D after being clamped by the clamp to a certain height, pausing for a certain time, putting the weight D back after the numerical value of the mass comparator is stable, manually putting a small weight m s, and recording the indicating value I E1;
S45, manually taking down a small weight m s, vertically lifting the weight D after being clamped by the weight D for a certain height, pausing for a certain time, returning the weight D and the small weight m s after the numerical value of the mass comparator is stabilized, and recording the indicating value I E2 at the moment;
S46, manually taking down a small weight m s, vertically lifting the weight D after being clamped by the weight D for a certain height, pausing for a certain time, putting the weight D back after the numerical value of the mass comparator is stable, and recording the indicating value I D2 at the moment, so that a group of calibration data of local indicating value errors is obtained;
s47: and step S41-S46 are circulated for a plurality of times, and other sets of calibration data of the local indicating value errors are obtained.
The above-described improved technical features may be combined with each other as long as they do not conflict with each other.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
(1) According to the calibration device suitable for the mass comparator, the stand and the rack are independently arranged, so that the stability of placement and fixation of the mass comparator during calibration is greatly improved, the influence of the vibration of the workbench on a calibration result caused by frequent taking and placing of weights is avoided, and the calibration accuracy of the mass comparator is improved; the X shaft assembly, the Y shaft assembly and the Z shaft assembly are correspondingly arranged on the workbench, so that weight taking and placing in the calibration process can be completed without manual taking and placing to the maximum extent, calibration errors caused by manual operation can be effectively reduced, the calibration precision of the quality comparator is further improved, the manual operation workload required in the calibration process is reduced, the labor cost is saved, and the calibration efficiency of the quality comparator is greatly improved;
(2) According to the calibrating device suitable for the mass comparator, the X-axis motor, the Y-axis motor, the Z-axis motor and the electric cabinet are correspondingly arranged, so that the weight taking and placing can be realized by accurately controlling the space motion of the clamp through the electric cabinet, the weight taking and placing precision in the calibrating process of the mass comparator can be further improved, the occurrence of calibration errors is reduced, the weight taking and placing efficiency in the calibrating process is improved, and the calibrating time is shortened;
(3) According to the calibration device suitable for the quality comparator, the sealing cover is arranged on the working platform, so that the calibration process of the quality comparator can be carried out in an environment relatively isolated from the outside, the generation and maintenance of the environment required by calibration are facilitated, the influence of the change of factors such as outside air flow, temperature and humidity on the calibration result of the quality comparator is reduced, the error possibly generated in the calibration process of the quality comparator is further reduced, and the calibration precision of the quality comparator is improved;
(4) the calibration method suitable for the mass comparator is realized by utilizing the calibration device, is simple and convenient in operation process, can accurately and quickly obtain calibration data required by the repeatability calibration, the unbalance loading calibration and the local indication error calibration of the mass comparator, greatly improves the calibration efficiency, effectively reduces the human error caused by the traditional manual weight taking and placing, improves the calibration precision of the mass comparator, greatly improves the quantity value transmission accuracy of the weight, and has good application prospect and popularization value.
drawings
FIGS. 1-3 are schematic perspective views of a calibration device according to an embodiment of the present invention at different axial side viewing angles;
FIG. 4 is a schematic structural diagram of the frame of the calibration device of the embodiment of the present invention with XYZ axis assemblies removed;
FIG. 5 is a top view of the frame of the alignment apparatus of an embodiment of the present invention with XYZ axis assemblies removed;
FIG. 6 is a schematic diagram of a weight seat structure of the calibration device in the embodiment of the present invention;
FIGS. 7(a) -7 (b) are schematic diagrams of the structure of the weight of the calibration device in the embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a test bed body of the calibration device in the embodiment of the present invention;
In all the figures, the same reference numerals denote the same features, in particular: 1. the device comprises a frame, 101, a working platform, 102, a support frame, 103 and a sliding door groove; 2. a test bed, 201, a bed body, 202, a limiting piece; 3, an X-axis assembly, 301, an X-axis motor, 302, an X-axis sliding rail and 303, a sliding block; 4, a Y-axis assembly, 401, a Y-axis motor, 402, a Y-axis slide rail, 403, a support; 5, Z-axis assembly 501, Z-axis motor 502, clamp; 6. a weight storehouse, 601, a weight base, 6011, a support plate, 6012, a weight groove, 6013, a bottom frame; 602. weight 6021 arc ring groove; 7. and a quality comparator 8, an electric cabinet.
Detailed Description
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
in addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
a calibration device suitable for use in a mass comparator in a preferred embodiment of the invention is shown in FIGS. 1-5. The device comprises a rack 1, a test bed 2, an X shaft assembly 3, a Y shaft assembly 4, a Z shaft assembly 5 and a weight library 6.
Specifically, the frame 1 includes a work platform 101 having a horizontal plate-like structure and a support frame 102 disposed at the bottom of the work platform 101, and the support frame 102 has a frame structure and is used for supporting the work platform 101 and each component on the work platform 101.
further, the test bed 2 and the frame 1 are arranged independently, and no connection exists between the test bed 2 and the frame, so that the quality comparator is always kept horizontal and stable when arranged on the test bed 2. Specifically, the test bed 2 comprises a bed body 201 which is arranged inside the support frame 102 and is of a solid block structure, the bottom surface of the bed body 201 is fixed on the ground, and the top surface of the bed body is always horizontal; preferably, the solid table 201 is a marble table. Further, the middle part of the working platform 101 is provided with a through hole, namely a limiting hole, which penetrates through two end faces of the working platform 101 in a certain size and is used for placing and limiting the mass comparator 7. In a preferred embodiment, the limiting hole is a rectangular through hole formed along the length direction of the working platform 101, and the length of the through hole is not less than the length of the mass comparator 7, and the width of the through hole is not less than the width of the mass comparator 7, as shown in fig. 4 and 5. Further, a limiting member 202, preferably in an "L-shaped" structure, is disposed on the top surface of the table body 201 facing the limiting hole and corresponding to the mass comparator 7, as shown in fig. 5, so that the mass comparator 7 to be calibrated can be stably limited on the test bed 2 through the limiting member 202, and the mass comparator 7 is prevented from moving during the calibration process.
Because the mass comparator 7 is very sensitive to vibration and displacement during calibration and work, the independent arrangement of the test bed 2 and the rack 1 can effectively avoid the working misalignment and calibration error of the mass comparator 7 caused by platform vibration when the mass comparator 7 is fixed on the working platform 101, and fully ensure the accuracy of mass transfer.
further, an X shaft assembly 3, a Y shaft assembly 4 and a Z shaft assembly 5 are arranged on the working platform 101 corresponding to the limiting holes. The Y-axis assembly 4 includes two Y-axis slide rails 402 disposed on the working platform 101, the two Y-axis slide rails 402 are parallel to each other, and the two Y-axis slide rails 402 are disposed on two sides of the limiting hole, in a preferred embodiment, the Y-axis slide rails 402 are disposed along the length direction of the working platform 101. Further, each Y-axis slide rail 402 is provided with a bracket 403, which in the preferred embodiment is an a-frame as shown in fig. 1-3, and the bottom of the bracket 403 is matched with the Y-axis slide rail 402 and can slide back and forth along the axial direction of the Y-axis slide rail 402.
further, a Y-axis motor 401 is disposed corresponding to the bracket 403 to drive the two brackets 403 to slide on the Y-axis slide rail 402 synchronously and reciprocally. Meanwhile, the Y-axis motors 401 may be provided for the two supports 403, respectively, or one Y-axis motor 401 may be provided to drive the two supports 403 to move synchronously as shown in the preferred embodiment.
further, the X-axis assembly 3 in the preferred embodiment is disposed on the top of the two brackets 403, and includes the X-axis slide rails 302 having two ends disposed on the top of the two brackets 403, respectively, and the axes of the X-axis slide rails 302 are perpendicular to the axes of the Y-axis slide rails 402 when projected onto the working platform 101, that is, in the preferred embodiment, the X-axis slide rails 302 are disposed along the width direction of the working platform 101. Further, a slide block 303 is disposed on the X-axis slide rail 302, and can slide back and forth along an axis of the X-axis slide rail 302, and an X-axis motor 301 is disposed corresponding to the slide of the slide block 303, as shown in fig. 1, the slide block 303 can be correspondingly driven to slide back and forth on the X-axis slide rail 302 by the control of the X-axis motor 301.
Further, Z axle subassembly 5 corresponds the setting of X axle subassembly, and it is fixed to be set up in the bottom of slider 303, including the vertical Z axle motor 501 that stretches out downwards of output shaft to and connect the anchor clamps 502 that set up at Z axle motor 501 output shaft tip, through the work of Z axle motor 501, can correspond and drive its output shaft vertical flexible, drive the vertical lift of anchor clamps 502 promptly.
further, a weight storage 6 is provided on the work platform 101 corresponding to the holder 502 for storing the weight 602. Specifically, the weight library 6 in the preferred embodiment includes a weight base 601 as shown in fig. 6 and weights 602 as shown in fig. 7(a), 7 (b). The weight base 601 comprises a plate-shaped supporting plate 6011, and a plurality of circular grooves are formed in the supporting plate 6011 corresponding to the weights 602 and used for correspondingly storing the weights 602; meanwhile, the bottom of the supporting plate 6011 is provided with a base 6013 to provide a support to the supporting plate 6011, and the base 6013 is preferably fixed on the work platform 101. Meanwhile, the weight 602 in the preferred embodiment is substantially cylindrical, and the top of the weight is provided with an arc-shaped ring groove 6021 along the circumferential direction at the periphery thereof for the corresponding clamping of the clamp 502.
Further, weight storehouse 6 sets up in spacing hole along Y axle direction one side for anchor clamps 502 can move to weight storehouse 6 department under the matching drive of X axle, Y axle, Z axle subassembly, presss from both sides then and gets corresponding weight 602. In a preferred embodiment, the clamp 502 is a horizontally disposed plate, and has a "C-shaped" notch cut on an end of at least one end thereof in the Y-axis direction, as shown in fig. 5. The corresponding clamping of the weight 602 can be realized by the corresponding matching of the C-shaped notch at the end of the clamp 502 and the arc-shaped ring groove 6021 at the top of the weight 602.
in the preferred embodiment, the weight 602 weighs 10-50 kg, and preferably comprises a 10kg weight, a 50kg weight and two 20kg weights. In order to balance the forces on the two ends of the working platform 101, the weight storehouses 6 in the preferred embodiment are two weight storehouses respectively arranged on the two sides of the limiting hole along the Y-axis direction, and as shown in fig. 5, a plurality of weights 602 are respectively stored in each weight storehouse 6. Correspondingly, C-shaped notches are respectively formed at two ends of the clamp 502 along the Y-axis direction, as shown in fig. 5, so as to achieve taking and placing of the weight 602 in the corresponding weight storage 6.
Further preferably, in order to accurately control the X-axis assembly 3, the Y-axis assembly 4, and the Z-axis assembly 5, an electric cabinet 8 is provided in the preferred embodiment, and is electrically connected to the X-axis motor 301, the Y-axis motor 401, and the Z-axis motor 501, respectively, and can correspondingly control the motors to complete driving of corresponding components, thereby achieving automatic taking and placing of the weight 602. Meanwhile, in order to further ensure the accuracy of the quality comparator 7 during calibration, a sealing cover is further arranged above the top surface of the working platform 101, and can cover all components above the working platform 101 to prevent the influence of outside air flow on the calibration result. Moreover, through the arrangement of the sealing cover, the conditions such as the temperature environment, the humidity environment and the like during the calibration of the mass comparator 7 are easier to adjust and control, and the calibration accuracy is further ensured. Correspondingly, a sliding door groove 103 as shown in fig. 1-3 is arranged on at least one side of the working platform 101 along the X-axis direction corresponding to the arrangement of the sealing cover, and is used for arranging a sliding door, so that the arrangement of components such as the mass comparator 7, the weight 602 and the like on the working platform 101 is facilitated.
The calibration device described above can be used for calibration of the mass comparator 7, and is particularly suitable for calibration of the mass comparator 7 having a maximum weighing capacity of not higher than 64kg and an accuracy d of 0.01 g. The calibration process usually includes repetitive calibration, offset calibration and indication error calibration in sequence. The specific process is preferably as follows:
s1: preparing before calibration, correspondingly preventing the quality comparator 7 to be calibrated from being placed on the test bed 2, and limiting and fixing the quality comparator 7 by using a limiting piece 202; meanwhile, a plurality of standard weights are correspondingly placed in the weight storeroom 6.
S2: performing a repetitive calibration of the mass comparator 7, preferably in 10 sets of assays in a cyclic manner "ABBA";
the detailed steps are as follows:
S21: controlling the X-axis motor 301, the Y-axis motor 401 and the Z-axis motor 501 to work correspondingly, driving the clamp 502 to move spatially, moving to the corresponding weight warehouse 6, and correspondingly clamping the weight A by the clamp 502;
S22: controlling the Z shaft assembly 5 to drive the clamped weight A to ascend, so that the weight A is separated from the weight base 601, and further controlling the X shaft assembly 3 and the Y shaft assembly 4 to enable the clamped weight A to move right above the mass comparator 7;
S23, controlling the Z shaft assembly 5 to drive the clamped weight A to descend, enabling the weight A to be accurately placed on the mass comparator 7, controlling the clamp 5 to be separated from the weight A, and recording an indication value I A1;
s24, clamping the weight A by using the clamp 502 and putting the weight A back into the weight library 6, clamping the weight B onto the mass comparator 7 according to the process of the steps S21-S23, and recording the indicating value I B1;
s25, clamping the weight B by using the clamp 502, rising for a certain height, pausing for a certain time, preferably 10S in the embodiment, putting down the weight B again after the indication value of the mass comparator is stable, and recording an indication value I B2 after removing the clamp 502;
s26, controlling the clamp 502 to put the weight B back into the weight library 6, corresponding to the clamp weight A, placing the weight A on the mass comparator 7, removing the clamp 502, and recording a value I A2 to obtain a group of ABBA calibration data;
s27: calibration data for another nine sets of ABBA are obtained according to steps S21-S26, and repetitive calibration of the mass comparator 7 is then completed according to the calibration data for the ten sets of ABBA.
S3: calibrating errors of four directions of front-back-left-right of a weighing disk of the mass comparator to finish an offset load calibration process;
it should be noted that the four orientations "front-back-left-right" are all relative to the center of the scale pan, and the orientations are selected according to the specification 7.2.4 of JJF 1326-. Taking the "front" orientation as an example: the specific placement position of the weights is ' middle-front-middle ', which is similar to the ABBA ' placement method, namely, a single weight is taken at each time and is sequentially placed at the center of the scale pan, the front part of the scale pan and the center of the scale pan.
the detailed calibration procedure is as follows:
s31: controlling the X-axis motor 301, the Y-axis motor 401 and the Z-axis motor 501 to work correspondingly, driving the clamp 502 to move spatially, moving to the corresponding weight warehouse 6, and correspondingly clamping the weight C by the clamp 502;
s32: controlling the Z shaft assembly 5 to drive the clamped weight C to ascend so that the weight C is separated from the weight base 601, and further controlling the X shaft assembly 3 and the Y shaft assembly 4 so that the clamped weight C moves to a position right above the scale center of the mass comparator 7;
S33: the Z shaft assembly 5 is controlled to drive the clamped weight C to descend, so that the weight C is accurately placed at the scale center of the mass comparator 7, the clamp 5 is controlled to be separated from the weight C, and the indicating value I at the moment is recordedIn 1；
S34: utilize anchor clamps 502 to press from both sides weight C and get and promote a take the altitude, control X axle subassembly 3 or Y axle subassembly 4, move weight C to the pan of steelyard directly over anterior, place weight C anterior at the pan of quality comparator 7 then, remove behind the anchor clamps 502 record indicating value I this momentfront 1；
S35: clamping the weight C by using the clamp 502, vertically lifting for a certain height, pausing for a certain time, preferably 10s in the preferred embodiment, putting down the weight C again after the indication value of the mass comparator is stable, and recording the indication value I after removing the clamp 502Front 2；
s36: the clamp 502 is controlled to clamp the weight C to be right above the scale center of the mass comparator 7, the weight C is placed at the scale center of the mass comparator 7, and the indicated value I is recorded after the clamp 502 is removedIn 2thereby obtaining a set of calibration data of the front part of the scale pan;
S37: calibration data of the rear scale portion, the left scale portion and the right scale portion are obtained in this order in steps S31 to S36, and the unbalance loading calibration of the mass comparator 7 is performed based on the data.
S4: calibrating the local indication error of the mass comparator 7;
the local index error calibration is performed by the proof mass comparator 7 for a small, relatively reasonable electronic display range, and is still performed in a cyclic manner of "ABBA" in which B is a + m s, m s is a small weight, m s is (1000 to 5000) d, and d is precision.
The detailed calibration steps are as follows:
s41: controlling the X-axis motor 301, the Y-axis motor 401 and the Z-axis motor 501 to work correspondingly, driving the clamp 502 to move spatially, moving to the corresponding weight library 6, and correspondingly clamping the weight D by the clamp 502;
S42: controlling the Z shaft assembly 5 to drive the clamped weight D to ascend so that the weight D is separated from the weight base 601, and further controlling the X shaft assembly 3 and the Y shaft assembly 4 so that the clamped weight D moves right above the mass comparator 7;
S43, controlling the Z shaft assembly 5 to drive the clamped weight D to descend so that the weight D is accurately placed in the center of the scale pan of the mass comparator 7, controlling the clamp 5 to be separated from the weight D, and recording an indication value I D1;
S44, the clamp 502 is used for clamping the weight D to rise to a certain height, the weight D is stopped for a certain time, in the preferred embodiment, the weight D is put down again after the indication value of the mass comparator is stable, the small weight m s is manually put in, and the indication value I (D+ms)1 at the moment is recorded after the indication value is stable;
s45, manually taking down the small weight m s, clamping the weight D by using the clamp 502, rising for a certain height, pausing for a certain time, preferably 10S in the embodiment, putting down the weight D again after the indication value of the mass comparator is stable, manually adding the small weight m s, and recording the indication value I (D+ms)2 after the indication value is stable;
S46, manually taking down the small weight m s, controlling the clamp 502 to clamp the weight D, rising for a certain height, pausing for a certain time, preferably 10S in the embodiment, putting down the weight D again after the indication value of the mass comparator is stable, removing the clamp 502, and recording the indication value I D2, thereby obtaining a group of calibration data of local indication value errors;
S47: the steps S41-S46 are repeated several times, preferably three times, to obtain another set of calibration data of the local indicating error, and then the calibration data obtained can be used to complete the local indicating error calibration of the mass comparator 7.
s5: the calibration of the mass comparator 7 is completed.
in addition, it is easy to see that the mass comparator completing calibration can further perform weight verification work on the calibration device, and accurate feeding of the weight 602 to be verified on the mass comparator 7 can be realized by using the matching work of the X shaft assembly 3, the Y shaft assembly 4 and the Z shaft assembly 5, so that the weight verification accuracy is improved.
the calibration device suitable for the quality comparator is simple in structure and convenient and fast to control, can accurately and quickly acquire data required by the quality comparator for repetitive calibration, unbalance loading calibration and local indication error calibration, avoids human influence in the data acquisition process as much as possible, effectively avoids influence caused by vibration of a workbench and fluctuation of environmental factors while reducing labor amount of manpower, fully ensures the calibration and working accuracy of the quality comparator, improves the calibration and working efficiency of the quality comparator, and has good application prospect and popularization value.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A calibration device suitable for a mass comparator comprises a rack consisting of a support frame and a working platform, and is characterized by further comprising a test bed, and an X shaft assembly, a Y shaft assembly and a Z shaft assembly which are arranged on the working platform;
The test bed comprises a bed body which is arranged in the support frame and is of a blocky structure, the bottom surface of the bed body is fixed on the ground, the top surface of the bed body is always horizontal, a through hole which penetrates through two end surfaces and has a certain size is formed in the middle of the working platform corresponding to the top surface of the bed body, namely a limiting hole is formed in the middle of the working platform and used for limiting the mass comparator, and a limiting part is arranged on the top surface of the bed body, which is vertically opposite to the limiting hole, and used for limiting the mass comparator;
The Y-axis assembly comprises Y-axis slide rails which are arranged on two sides of the limiting hole in parallel, the Y-axis slide rails are fixed on the working platform, and a support capable of axially sliding back and forth along the Y-axis slide rails is arranged on each Y-axis slide rail; the X-axis assembly is arranged at the tops of the two supports and comprises an X-axis slide rail and a slide block, wherein two ends of the X-axis slide rail are respectively fixed at the tops of the two supports, and the slide block is arranged on the X-axis slide rail and can axially slide along the X-axis slide rail in a reciprocating manner; the Z-axis assembly comprises a Z-axis motor fixedly arranged at the bottom of the sliding block, the end part of an output shaft of the Z-axis motor faces downwards and can stretch and retract in a reciprocating manner along the vertical direction, and a clamp is arranged at the end part of the output shaft of the Z-axis motor;
Meanwhile, a weight library is arranged on a working platform on at least one side of the limiting hole along the axial direction of the Y-axis sliding rail, a plurality of weights can be contained in the weight library, the clamp can be driven by the combination of the X-axis assembly, the Y-axis assembly and the Z-axis assembly to align to the weights, and the clamp can be clamped to a mass comparator limited in the limiting hole.
2. The calibration device for the mass comparator as claimed in claim 1, wherein an X-axis motor for driving the slider to reciprocate is provided for the slider, and a Y-axis motor for driving the supports to reciprocate is provided for the two supports.
3. The calibration device for the mass comparator as claimed in claim 2, further comprising an electric control box electrically connected to the X-axis motor, the Y-axis motor and the Z-axis motor respectively for controlling the operation of each motor respectively.
4. the calibration device for the mass comparator according to any one of claims 1-3, wherein the weight storage is divided into two weight storages, which are respectively arranged at two sides of the limiting hole along the axial direction of the Y-axis sliding rail.
5. the calibration device suitable for the mass comparator as claimed in claim 4, wherein the fixture is a horizontal plate-shaped structure, the middle part of the fixture is correspondingly connected with the output shaft of the Z-axis motor, and the two side end parts of the fixture along the axial direction of the Y-axis slide rail are respectively provided with a "C-shaped" notch capable of matching with the arc-shaped ring groove at the top of the weight.
6. The calibration device for the mass comparator as claimed in any one of claims 1 to 5, wherein a sealing cover is further disposed on the top surface of the working platform, and the sealing cover can cover all the components above the top surface of the working platform.
7. a calibration method for a mass comparator, which is implemented by using the calibration apparatus for a mass comparator as claimed in any one of claims 1 to 6, and comprises the following steps:
S1: limiting and fixing a mass comparator to be calibrated on the test bed, and placing a corresponding standard weight in the weight library;
s2: acquiring data required by the quality comparator for repetitive calibration by using the calibration device, and performing repetitive calibration;
s3: acquiring data required by the mass comparator for offset load calibration by using the calibration device, and performing offset load calibration;
S4: acquiring data required by the quality comparator for local indicating value error calibration by using the calibration device, and performing local indicating value error calibration;
s5: and finishing the calibration of the quality comparator to be calibrated.
8. The calibration method for a mass comparator as claimed in claim 7, wherein in step S2, the data required for the repetitive calibration is obtained by:
s21: controlling the bracket and the sliding block to move cooperatively, and adjusting the height of the clamp by the Z-axis motor, so that the clamp moves to the weight storage and clamps a corresponding weight (A);
S22: controlling an X/Y/Z shaft assembly to drive the weight (A) to be right above the mass comparator;
s23, controlling the clamp to descend, placing the weight (A) on the mass comparator, separating the clamp from the weight (A) and recording the indicating value (I A1) at the moment;
S24, clamping the weight (A) and putting the weight (A) back to the weight library, clamping a weight (B) with the same mass as that of the weight (A) onto the mass comparator, and recording the indicating value (I B1) at the moment;
s25, vertically lifting the weight (B) to a certain height after the weight (B) is clamped, pausing for a certain time, putting the weight (B) back after the numerical value of the mass comparator is stable, and recording the indicating value (I B2) at the moment;
s26, clamping the weight (B) and putting the weight library back, clamping the weight (A) to the mass comparator, and recording the indicating value (I A2) at the moment to obtain a group of repeated calibration data;
S27: and circulating the steps S21-S26 for a plurality of times to obtain other sets of repeated calibration data.
9. The calibration method for a mass comparator according to claim 7 or 8, wherein in step S3, the data required for the offset calibration includes scale front data, scale rear data, scale left data and scale right data, and the data are obtained by:
s31: controlling the bracket and the sliding block to move cooperatively, and adjusting the height of the clamp by the Z-axis motor, so that the clamp moves to the weight storage and clamps a corresponding weight (C);
S32: controlling an X/Y/Z shaft assembly to drive the weight (C) to be right above the center of a scale pan of the mass comparator;
S33: controlling the clamp to descend to enable the weight (C) to be placed at the center of a scale pan of the mass comparator, separating the clamp from the weight (C) and recording the indicating value (I) at the momentIn 1)；
s34: controlling the clamp to clamp and lift the weight (C) and then placing the weight (C) at the front part of a scale pan of the mass comparator, and recording the indicating value (I) at the momentFront 1)；
S35: controlling the clamp to vertically lift the weight (C) to a certain height after the weight (C) is clamped, pausing for a certain time, placing the weight (C) back to the front part of the scale pan after the numerical value of the mass comparator is stabilized, and recording the indicating value (I) at the momentFront 2)；
S36: controlling the clamp to clamp and lift the weight (C) and then placing the weight (C) in the middle of a scale pan of the mass comparator, and recording the indicating value (I) at the momentin 2) Thereby obtaining the scale front data;
s37: and (3) repeating the steps S31-S36 for three times, and replacing the position where the weight (C) is placed in the steps S34 and S35 from the front part of the scale pan to the rear part of the scale pan, the left part of the scale pan and the right part of the scale pan in each cycle, so as to obtain the data of the rear part of the scale pan, the data of the left part of the scale pan and the data of the right part of the scale pan.
10. The calibration method for the mass comparator as claimed in any one of claims 7 to 9, wherein in step S4, the data required for the local indicating error calibration is obtained by:
s41: controlling the bracket and the sliding block to move cooperatively, and adjusting the height of the clamp by the Z-axis motor, so that the clamp moves to the weight storage and clamps a corresponding weight (D);
S42: controlling an X/Y/Z shaft assembly to drive the weight (D) to be right above the mass comparator;
s43, controlling the clamp to descend, placing the weight (D) on the mass comparator, separating the clamp from the weight (D) and recording the indicating value (I D1) at the moment;
s44, vertically lifting the weight (D) to a certain height after the weight (D) is clamped, pausing for a certain time, putting the weight (D) back after the numerical value of the mass comparator is stabilized, manually adding a small weight (m s), and recording the indicating value (I E1) at the moment;
s45, manually taking down a small weight (m s), vertically lifting the weight (D) to a certain height after clamping, pausing for a certain time, putting the weight (D) and the small weight (m s) back after the numerical value of the mass comparator is stable, and recording the indicating value (I E2) at the moment;
S46, manually taking down a small weight (m s), vertically lifting the weight (D) after clamping for a certain height, pausing for a certain time, putting the weight (D) back after the numerical value of the mass comparator is stabilized, and recording the indicating value (I D2) at the moment, so as to obtain a group of calibration data of local indicating value errors;
s47: and step S41-S46 are circulated for a plurality of times, and other sets of calibration data of the local indicating value errors are obtained.
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| CN111397719A (en) * | 2020-04-08 | 2020-07-10 | 常州市富月砝码有限公司 | Full-automatic high accuracy electronic scale precision check system |
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| CN111397719A (en) * | 2020-04-08 | 2020-07-10 | 常州市富月砝码有限公司 | Full-automatic high accuracy electronic scale precision check system |
| CN111780850A (en) * | 2020-07-10 | 2020-10-16 | 上海市计量测试技术研究院 | Weighing platform with double weighing parts and mass comparator |
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| CN112604180A (en) * | 2020-12-08 | 2021-04-06 | 华中科技大学 | Four-stage magnet mechanical clamping device for particle conveying line and debugging and calibrating method thereof |
| CN112604180B (en) * | 2020-12-08 | 2022-02-15 | 华中科技大学 | Four-stage magnet mechanical clamping device for particle conveying line and debugging and calibrating method thereof |
| CN114674409A (en) * | 2022-03-21 | 2022-06-28 | 山东省计量科学研究院 | Automatic calibration system for quality comparator based on cloud platform |
| CN115597775A (en) * | 2022-12-13 | 2023-01-13 | 招商局金陵船舶（威海）有限公司（Cn） | Ship inclination test auxiliary device and method |
| CN115597775B (en) * | 2022-12-13 | 2023-03-21 | 招商局金陵船舶(威海)有限公司 | Ship inclination test auxiliary device and method |
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