CN115493678A - Static truck scale precision adjusting method - Google Patents
Static truck scale precision adjusting method Download PDFInfo
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- CN115493678A CN115493678A CN202110682085.6A CN202110682085A CN115493678A CN 115493678 A CN115493678 A CN 115493678A CN 202110682085 A CN202110682085 A CN 202110682085A CN 115493678 A CN115493678 A CN 115493678A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/02—Arrangements of bearings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/02—Arrangements of bearings
- G01G21/08—Bearing mountings or adjusting means therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
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- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention relates to a method for adjusting precision of a static truck scale, which comprises the following steps: step 1: adjusting the clearance of the supporting mechanism and designing the size; and 2, step: adjusting the gap of the weighing mechanism and designing parameters of parts; and step 3: and adjusting the horizontal precision of the scale panel. The technical scheme effectively avoids adjusting the level of the scale panel only by depending on the simulation parameters of the sensor, and prolongs the service life of the static automobile scale and the weighing requirement. The adjusting method has the advantages of potential safety hazard, simple process and less input of manpower and material resources.
Description
Technical Field
The invention relates to a method for adjusting precision of a static truck scale, and belongs to the technical field of static truck scales.
Background
The most used current is dynamic automobile scale, the automobile scale is moved up and down to generate violent irregular shaking, the violent irregular shaking and the larger impact of the spiral limit cause the cement foundation to sink for a long time, the contact abrasion of the weighing sensor is serious, the service life and the weighing precision are reduced, and the scale panel is locally deformed. The static truck scale is a metering device consisting of a supporting mechanism, a weighing mechanism and a hydraulic control system. The precision of weighing data is far higher than that of a dynamic automobile scale, the structure is complex, but the stability, the failure rate, the over-weighing and the service life of the weighing data are far superior to those of similar products. However, the installation accuracy is higher than the dynamic requirement, and it is difficult to take a long time, which causes a bad condition of reducing the productivity, and therefore, a new solution for solving the above technical problem is urgently needed.
Disclosure of Invention
The invention provides a method for adjusting the precision of a static truck scale aiming at the problems in the prior art, and the technical scheme effectively avoids adjusting the level of a scale panel only by depending on the simulation parameters of a sensor, and prolongs the service life of the static truck scale and the weighing requirement. The adjusting method has the advantages of potential safety hazard, simple process and less input of manpower and material resources.
In order to achieve the above object, the technical solution of the present invention is a method for adjusting precision of a static truck scale, the method comprising the steps of:
step 1: support mechanism clearance adjustment and design dimensions (reference values);
step 2: adjusting the gap of the weighing mechanism and designing parameters of parts;
and step 3: and adjusting the horizontal precision of the scale panel.
1) The processed lifting lug, the round shaft, the control taper sleeve and the nut are assembled and placed in order according to requirements, and the assembly is called as a first assembly; determining conditions: a (distance from the circle center of the circular shaft to the plane of the lifting lug), c (diameter of the circular shaft), d (size of an opening of a dovetail groove of the positioning seat), e (supporting height), f (height of the positioning seat) and j (gap between the circular shaft and the dovetail groove);
unknown conditions: b (the distance between the vertex angle of the positioning seat dovetail groove and the bottom surface), x (the distance between the vertex angle of the positioning seat dovetail groove and the circle center of the circular shaft), and x1 (the thickness of the base plate);
x1 (thickness of the base plate) = e (support height) -f (height of the positioning seat);
when the vertex angle of the dovetail groove is 90 degrees, x (the distance from the vertex angle of the dovetail groove of the positioning seat to the circle center of the circular shaft) = √ (c) 2 ÷2)
When the vertex angle of the dovetail groove is 120 degrees, x (the distance from the vertex angle of the dovetail groove of the positioning seat to the circle center of the circular axis) = √ c (c) 2 ÷3)
b (distance between the vertex angle of the positioning seat dovetail groove and the bottom surface) = e (support height) -x (distance between the vertex angle of the positioning seat dovetail groove and the circle center of the circular shaft) -a (distance between the circle center of the circular shaft and the plane of the lifting lug);
when the vertex angle of the dovetail groove is 90 degrees, j (a gap between a circular axis and the dovetail groove) is designed to be 5mm, x (the distance from the vertex angle of the dovetail groove of the positioning seat to the circle center of the circular axis) = (c + 10) ÷ V/2;
when the vertex angle of the dovetail groove is 120 degrees, the design j (the gap between the circular axis and the dovetail groove) is 5mm, x (the distance from the vertex angle of the dovetail groove to the circle center of the circular axis of the positioning seat) = (c + 10) ÷ V/3 (see table 1)
Calculating according to the conditions and the formula, when the supporting mechanism jacks up the scale panel;
table 1 shows support mechanism parts and assembly parameter references;
2) Placing each positioning seat on a steel plate, conveniently placing four cushion plates on the end faces of threaded holes of the positioning seats, measuring the combined height (e) by using a height gauge, requiring that the error of the combined height (e) is 10-10 mm, the flatness error of four measuring points is 0-0.05 mm, recording the number, and installing an adjusting pad between each cushion plate and the end face of the threaded hole of each positioning seat, so that the positioning seats are ensured to be in an equal-height state;
3) And placing the round shaft of the first assembly into the dovetail groove of the positioning seat, and fastening the bolt with the positioning seat through the lifting lug and the through hole of the backing plate in a threaded connection manner. Measuring two gaps between the circular shaft and the plane of the dovetail groove by using a feeler gauge, ensuring that the error of j is 0-0.1mm, and the error of 2 times j is 0-0.15 mm, assembling and measuring the supporting structure according to the method, and recording the serial number;
4) Placing four jacks on a steel plate, stably placing a first scale panel on the jacks, taking the highest combined height of the supporting mechanisms as an accurate size, loosening and taking out bolts, firstly moving the bolts to the lower part of the scale panel, penetrating the bolts through the scale panel, connecting and fastening the components and the base plate with threaded holes, and installing the three supporting mechanisms under the scale panel according to the method without releasing the jacks according to the completion of the supporting mechanisms (paying attention to the fact that the circular shafts at the connecting positions of the scale panel are installed in parallel with the circular shafts);
5) Hoisting the scale panel by using hoisting equipment to take out the jack, placing the right-angle positioning block on the scale panel handle, dropping the scale panel, clamping the right-angle positioning block between the guide way and the scale panel, completely compacting the positioning seat on the steel plate, determining the gap between the guide way and the scale panel as a reference, determining the high-end position of the support mechanism on the steel plate, dismantling the hoisting equipment, not taking out the right-angle positioning block, and at the moment, completing the installation of the first scale panel,
6) The second scale panel only needs to be provided with two supporting mechanisms, the two scale panels are connected according to the installation and measurement method,
7) Placing a level bar at the middle position of the short side of the highest dimension of a first scale panel supporting mechanism, wherein the error of the level bar per meter is 0.02mm, placing bubbles of the level bar at the position of the highest dimension of the supporting mechanism, slowly jacking a scale panel of a lower supporting mechanism by using a jack, observing the number of bubbles moving to a grid, stopping applying force to the jack when the bubbles are at the middle position, measuring the gap between a positioning seat and a steel plate by using a feeler gauge, or directly calculating the number of the bubbles to obtain the size of the gap, then cushioning an adjusting block with a corresponding size at the gap, releasing the jack, observing whether the position of the bubbles of the level bar is at a middle position, continuously repeating the measuring operation method until the level precision of the scale panel is 0-0.15 mm, and taking away the jack,
8) The level ruler is changed to the middle position of the long side with the highest dimension of the first scale panel supporting mechanism, the jack is placed below the scale panel with the low point to apply force, so that the bubble of the level ruler is in the middle position, the adjusting pad is plugged in the gap position through measurement and calculation, the jack is released, so that the bubble position of the level ruler is in the middle position, the level precision is 0-0.2 mm,
9) Measuring and adjusting the height difference of the other two support structures according to the method, ensuring that the levelness of the scale panel is within 0-30 mm, and finishing the adjustment of the first scale panel;
10 Repeating the above steps to finish the levelness of the second scale panel, taking away the jack, finishing the precision adjustment of the static automobile scale supporting mechanism and the scale panel, and taking out the right-angle positioning block.
And 2, step: the clearance adjustment and the part design parameters of the weighing mechanism are as follows:
1) Sleeving all cone pressing heads into the positions of the mounting holes of the scale panel, sequentially measuring the dimension h by using an inside micrometer, wherein the error is 0-0.05 mm, and numbering and recording;
2) The hydraulic cylinder is placed on the steel plate, the jacking sleeve fastening locking nut is sequentially installed, the sensor is placed, the adjusting sleeve is covered, and the tip cone is screwed into the threaded hole of the adjusting sleeve to the bottom to form a weighing mechanism;
3) When the hydraulic cylinder is in the minimum range, the height of all weighing mechanisms h2 is measured by height gauges and recorded;
4) Connecting a hydraulic loop, and fastening an oil pipe installation drawing to each weighing mechanism hydraulic cylinder joint; the system is adjusted to low pressure, so that the weighing mechanism slowly rises to the top;
5) When the hydraulic cylinder is in the maximum measuring range, the height of all weighing mechanisms h1 is measured by using height gauges, and the weighing mechanisms are numbered and recorded;
6) And comparing the heights of each weighing mechanism h1 and h in the maximum measuring range of the hydraulic cylinder. The height of h1 is certainly lower than h, the tip cone is rotated to ascend, the error between the height of h1 and the height of h is 0-0.03mm, and then the locknut is fastened;
7) The hydraulic cylinder is decompressed, the weighing mechanism falls to the bottom, and the height h2 is measured by a height gauge, so that the error x2 is ensured to be within-0.1-0.2 mm;
8) The height of the frame y is not required to be in contact with the cone pressure head when the weighing mechanism does not weigh the minimum measuring range, and a gap of 20mm is preferably reserved;
9) x3 is 10mm larger than the maximum range of the hydraulic cylinder, so that the conical pressure head is ensured to be centered, and the sealing ring moves in the frame hole;
10 After the parameter size of the weighing mechanism is adjusted, the oil pipe is removed, the weighing panel is jacked up one by using a jack, the corresponding weighing mechanism is placed below the cone pressing head, the hole of the cone pressing head is aligned with the cone head of the top cone, then the jack is released, and the hole of the cone pressing head is aligned with the weighing mechanism again by using a hand. After the position of each hydraulic cylinder is determined, a jack applies force, the weighing mechanism is moved out, the sensor, the adjusting sleeve and the tip cone which are connected together are taken down, and all steel plate threaded holes are drilled in a matched mode;
11 The hydraulic cylinder is fastened with a steel plate bolt, the hydraulic cylinder is wrapped by the frame, the sealing ring is installed on the tip cone and then penetrates through a frame hole, the upper contact and the lower contact of the sensor are connected with the inner holes of the jacking sleeve and the adjusting sleeve, and the jack is released; the frame and the positioning seat are fixed by welding. Positioning the weighing mechanism according to the method and combining and fixing the weighing mechanism with the frame;
12 To the end of the adjustment of the measurement accuracy of the static truck scale weighing mechanism.
Table 2 shows the values of the tip cone and cone head clearance parameters at the time of the minimum measuring range of the weighing mechanism
Table 2:
(1) Connecting a hydraulic cylinder and an oil pipe, placing a level ruler at the long edge and the short edge of the scale panel, starting a system to measure the levelness when the scale panel ascends or descends, ensuring that the error of the levelness is between-0.1 and 0.2, and not taking away the level ruler;
(2) Observing and recording simulation parameters of a sensor when a weighing instrument rises to bear, finding out the maximum and minimum difference values of the simulation parameters of a weighing mechanism, wherein the requirement is within 500-50, matching with an adjusting pad needing to be added to a supporting point at the bottom of a leveling ruler, releasing pressure of a hydraulic system, loosening a fastening bolt of a hydraulic cylinder, plugging the adjusting pad into the bottom, fastening the bolt, starting the hydraulic system again, ascending the hydraulic cylinder, observing the simulation parameters and the leveling ruler, determining whether the supporting point meets the requirement, repeating the process until the precision requirement is met, and then adjusting other weighing mechanisms according to the method;
(3) After the scale panel is adjusted, the scale panel is lifted, bolts are screwed out one by one to take out the base plate, then the bolts are screwed and replaced to connect and fasten the lifting lugs and the scale panel, the hydraulic cylinder is descended, the scale panel is compacted on the dovetail groove of the positioning seat, a clearance between the dovetail groove and the circular shaft of the owner is measured by a clearance gauge, and the requirement is 0-0.03 mm;
(4) The scale is ready for use by the end of the simulation design parameters, gap adjustment and control method for the static truck scale support mechanism and weighing mechanism.
Compared with the prior art, the invention has the following advantages:
1. the right-angle positioning blocks are used for rapidly determining the installation gaps between the truck scale and the inlet and the outlet of the approach way respectively, so that the gap is changed when the scale panel is hoisted repeatedly, and the subsequent installation precision adjustment is influenced.
2. According to the technical scheme, a gap of 5mm is directly preset between the circular shaft and the two surfaces of the dovetail groove of the positioning seat, the height of the base plate is calculated by e-f, the supporting mechanism is installed when leaving a factory through the base plate, the gap is controlled, and the adjustment is not needed after the installation. Is safely, reliably and stably placed on the steel plate. The potential safety hazard caused by repeated hoisting or using of the jack to jack the displacement scale panel in the prior art is avoided.
3. The preset parameters in the tables 1 and 2 are set as integers, so that the calculation, the reference, the reasonable and standard manufacturing and gap control are facilitated, and the levelness of the scale panel is conveniently adjusted.
4. The measuring tool is used for obtaining the required adjustment precision, and the problems that the zero-position sensor is uneven in pressure bearing caused by the fact that the output simulation parameters of a weighing instrument are used as the adjustment standard in the prior art are solved, a weighing mechanism of a scale panel has a height difference, the levelness of the scale panel is extremely poor, and upper and lower contacts of the sensor are seriously abraded.
5. A5 mm gap is directly preset on the two surfaces of the dovetail groove of the positioning seat according to the circular shaft, so that the height of the positioning seat is effectively controlled, and the maximum range of the weighing mechanism and the model of the hydraulic cylinder are informed of matching.
6. The method requires high levelness requirement of the base steel plate of the scale body, and if the levelness is poor, the levelness can be achieved by adding an adjusting cushion below the positioning seat in the subsequent adjustment.
7. The adjusting method depends on preset values in tables 1 and 2, at 90 and 120 degrees, x = √ (c 2 ÷ 2) and x = √ (c 2 ÷ 3) ensure that the top cone is completely contacted with the cone pressure head when the hydraulic cylinder is at the maximum range, the scale panel keeps horizontal precision, and the pressure bearing is uniform. In the minimum range, the scale panel is supported on the positioning dovetail groove, the tip cone is controlled in the cone pressure head, and the sensor absolutely loses pressure.
The contact angles of the 8.90 dovetail grooves and the 120 dovetail grooves are large, so that the scales of the automobile can be more stably and freely lifted, the accumulated dust can be conveniently and randomly cleaned, and the adverse effect of irregular impact of the dynamic automobile scale can be avoided.
9. The method relies on data support, controls the static truck scale to improve the installation precision, ensures that the weighing mechanism meets the requirement of improving the precision, ensures the service life of parts and reduces the accident of stopping the scale caused by machinery. This static truck scale is according to independently designing, and the precision parameter is predetermine to the control spare part precision, through calculating, strengthens the adjustment clearance requirement, effectively stops to rely on sensor simulation parameter to adjust the balance panel level, prolongs static truck scale life and crosses the balance volume demand. The adjusting method has the advantages of potential safety hazard, simple process and less input of manpower and material resources
Drawings
FIG. 1 is a schematic diagram of determining the height dimension of a scale panel;
FIG. 2 is a schematic view of a gap between a circular shaft of a measurement support mechanism and a dovetail groove;
FIG. 3 is a control diagram of clearance between an inlet and an outlet of a panel of a static truck scale;
FIG. 4 is a parametric illustration of a support mechanism;
FIG. 5 is a parameter plot of a weighing mechanism;
fig. 6 is a diagram of the balance panel horizontal adjustment.
In the figure: : 1-right angle positioning block, 2-guide way, 3-scale panel, 4-bolt, 5-lifting lug, 6-round shaft, 7-screw, 8-positioning seat, 9-backing plate, 10-steel plate, 11-foundation, 12-jack, 13-feeler gauge, 14-height gauge, 15-level gauge, 16-a (distance from circle center to lifting lug plane), 17-b (distance from dovetail groove vertex angle to bottom surface of positioning seat), 18-c (diameter of round shaft), 19-d (size of dovetail groove opening), 20-e (supporting height), 21-f (height of positioning seat), 22-j (gap between round shaft and dovetail groove), 23-x (distance from dovetail groove vertex angle to circle center of round shaft), 24-x 1 (thickness of backing plate), 25-h (distance from bottom surface of cone head cone hole to steel plate), 26-h 1 (range of hydraulic cylinder), 27-h 2 (minimum range of hydraulic cylinder), 28-x 2 (gap of tip cone and cone), 29-x 3 lifting hole height, 30-y (height of frame), 31-inner diameter, 33-micrometer.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1, a method for adjusting precision of a static truck scale, the method comprising the steps of:
step 1: support mechanism clearance adjustment and design dimensions (reference values);
and 2, step: adjusting the clearance of the weighing mechanism and designing parameters of parts;
and step 3: and adjusting the horizontal precision of the scale panel.
1) The processed lifting lug, the round shaft, the control taper sleeve and the nut are assembled and placed in order according to requirements, and the assembly is called as a first assembly; determining conditions: a (distance from the circle center of the circular shaft to the plane of the lifting lug), c (diameter of the circular shaft), d (size of an opening of a dovetail groove of the positioning seat), e (supporting height), f (height of the positioning seat) and j (gap between the circular shaft and the dovetail groove);
unknown conditions: b (the distance between the vertex angle of the dovetail groove of the positioning seat and the bottom surface), x (the distance between the vertex angle of the dovetail groove of the positioning seat and the circle center of the circular shaft), and x1 (the thickness of the base plate);
x1 (thickness of the base plate) = e (support height) -f (height of the positioning seat);
when the vertex angle of the dovetail groove is 90 degrees, x (the distance from the vertex angle of the dovetail groove of the positioning seat to the circle center of the circular axis) = √ c (c) 2 ÷2)
When the vertex angle of the dovetail groove is 120 degrees, x (the distance from the vertex angle of the dovetail groove of the positioning seat to the circle center of the circular axis) = √ c (c) 2 ÷3)
b (distance between the vertex angle of the positioning seat dovetail groove and the bottom surface) = e (supporting height) -x (distance between the vertex angle of the positioning seat dovetail groove and the circle center of the circular shaft) -a (distance between the circle center of the circular shaft and the plane of the lifting lug);
when the vertex angle of the dovetail groove is 90 degrees, j (a gap between a circular axis and the dovetail groove) is designed to be 5mm, x (the distance from the vertex angle of the dovetail groove of the positioning seat to the circle center of the circular axis) = (c + 10) ÷ V/2;
when the vertex angle of the dovetail groove is 120 degrees, the design j (the gap between the circular axis and the dovetail groove) is 5mm, x (the distance from the vertex angle of the dovetail groove to the circle center of the circular axis of the positioning seat) = (c + 10) ÷ V/3 (see table 1)
Calculating according to the conditions and the formula, when the supporting mechanism jacks up the scale panel;
table 1 shows the support mechanism parts and assembly parameters;
2) Placing each positioning seat on a steel plate, conveniently placing four cushion plates on the end faces of threaded holes of the positioning seats, measuring the combined height (e) by using a height gauge, requiring that the error of the combined height (e) is 10-10 mm, the flatness error of four measuring points is 0-0.05 mm, recording the number, and installing an adjusting pad between each cushion plate and the end face of the threaded hole of each positioning seat, so that the positioning seats are ensured to be in an equal-height state;
3) And placing the round shaft of the first assembly into the dovetail groove of the positioning seat, and fastening the bolt with the positioning seat in a threaded connection mode through the lifting lug and the through hole of the base plate. Measuring two gaps between the circular shaft and the plane of the dovetail groove by using a feeler gauge, ensuring that the error of j is 0-0.1mm, and the error of 2 times j is 0-0.15 mm, assembling and measuring the supporting structure according to the method, and recording the serial number;
4) Placing four jacks on a steel plate, stably placing a first scale panel on the jacks, taking the highest combined height of the supporting mechanisms as an accurate size, loosening and taking out the bolt, firstly moving the bolt to the lower part of the scale panel, penetrating the bolt through the scale panel, connecting and fastening the assembly and the base plate with a threaded hole, installing the three supporting mechanisms under the scale panel according to the method without releasing the jacks according to the completion of the supporting mechanisms (paying attention to the fact that the circular shaft at the connecting position of the scale panel is installed in parallel with the circular shaft)
5) Hoisting the scale panel by using hoisting equipment to take out the jack, placing a right-angle positioning block on the scale panel handle, dropping the scale panel, clamping the right-angle positioning block between the guide way and the scale panel, completely compacting the positioning seat on the steel plate, determining the gap between the guide way and the scale panel as the reference, determining the high-end position of the supporting mechanism on the steel plate, removing the hoisting equipment, not taking out the right-angle positioning block, and at the moment, finishing the installation of the first scale panel,
6) The second scale panel only needs to be provided with two supporting mechanisms, the two scale panels are connected according to the installation and measurement method,
7) Placing a level bar at the middle position of the short side of the highest dimension of a first scale panel supporting mechanism, wherein the error of the level bar per meter is 0.02mm, placing bubbles of the level bar at the position of the highest dimension of the supporting mechanism, slowly jacking a scale panel of a lower supporting mechanism by using a jack, observing the number of bubbles moving to a grid, stopping applying force to the jack when the bubbles are at the middle position, measuring the gap between a positioning seat and a steel plate by using a feeler gauge, or directly calculating the number of the bubbles to obtain the size of the gap, then cushioning an adjusting block with a corresponding size at the gap, releasing the jack, observing whether the position of the bubbles of the level bar is at a middle position, continuously repeating the measuring operation method until the level precision of the scale panel is 0-0.15 mm, and taking away the jack,
8) The level ruler is changed to the middle position of the long side with the highest dimension of the first scale panel supporting mechanism, the jack is placed below the scale panel with the low point to apply force, so that the bubble of the level ruler is in the middle position, the adjusting pad is plugged in the gap position through measurement and calculation, the jack is released, so that the bubble position of the level ruler is in the middle position, the level precision is 0-0.2 mm,
9) Measuring and adjusting the height difference of the other two support structures according to the method, ensuring that the levelness of the scale panel is within 0-30 mm, and finishing the adjustment of the first scale panel;
10 Repeating the steps to complete the levelness of the second scale panel, taking away the jack, finishing the precision adjustment of the static automobile scale supporting mechanism and the scale panel, and taking out the right-angle positioning block.
And 2, step: the clearance adjustment and the part design parameters of the weighing mechanism are as follows:
1) Sleeving all cone pressing heads into the positions of the mounting holes of the scale panel, sequentially measuring the dimension h by using an inside micrometer, wherein the error is 0-0.05 mm, and numbering and recording;
2) The hydraulic cylinder is placed on the steel plate, the jacking sleeve fastening locking nut is sequentially installed, the sensor is placed, the adjusting sleeve is covered, and the tip cone is screwed into the threaded hole of the adjusting sleeve to the bottom to form a weighing mechanism;
3) When the hydraulic cylinder has the minimum measuring range, the height of all weighing mechanisms h2 is measured by a height gauge and recorded;
4) Connecting a hydraulic loop, and fastening an oil pipe installation drawing to each weighing mechanism hydraulic cylinder joint; the system is adjusted to low pressure, so that the weighing mechanism slowly rises to the top;
5) When the hydraulic cylinder is in the maximum measuring range, the height of all weighing mechanisms h1 is measured by using height gauges, and the weighing mechanisms are numbered and recorded;
6) And comparing the heights of the weighing mechanisms h1 and h in the maximum range of the hydraulic cylinder. The height of h1 is certainly lower than h, the tip cone is rotated to ascend, the error between the height of h1 and the height of h is 0-0.03mm, and then the locknut is fastened;
7) The hydraulic cylinder is decompressed, the weighing mechanism falls to the bottom, and the height h2 is measured by a height gauge, so that the error x2 is ensured to be within-0.1-0.2 mm;
8) The height of the frame y is not required to be in contact with the cone pressure head when the weighing mechanism does not weigh the minimum measuring range, and a gap of 20mm is preferably reserved;
9) x3 is 10mm larger than the maximum range of the hydraulic cylinder, so that the conical pressure head is ensured to be centered, and the sealing ring moves in the frame hole;
10 After the parameter size of the weighing mechanism is adjusted, the oil pipe is removed, the weighing panel is jacked up one by using a jack, the corresponding weighing mechanism is placed below the cone pressing head, the hole of the cone pressing head is aligned with the cone head of the top cone, then the jack is released, and the hole of the cone pressing head is aligned with the weighing mechanism again by using a hand. After the position of each hydraulic cylinder is determined, a jack applies force, the weighing mechanism is moved out, the sensor, the adjusting sleeve and the tip cone which are connected together are taken down, and all steel plate threaded holes are drilled in a matched mode;
11 The hydraulic cylinder is fastened with a steel plate bolt, the hydraulic cylinder is wrapped by the frame, the sealing ring is installed on the tip cone and then penetrates through a frame hole, the upper contact and the lower contact of the sensor are connected with the inner holes of the jacking sleeve and the adjusting sleeve, and the jack is released; the frame and the positioning seat are fixed by welding. Positioning the weighing mechanism according to the method and combining and fixing the weighing mechanism with the frame;
12 Till the measurement accuracy of the static vehicle scale weighing mechanism is adjusted.
Table 2 shows the values of the tip cone and cone head clearance parameters at the time of the minimum measuring range of the weighing mechanism
Table 2:
(1) Connecting a hydraulic cylinder and an oil pipe, placing a horizontal ruler at the long edge and the short edge of the scale panel, starting a system to measure the levelness of the scale panel when the scale panel ascends or descends, ensuring that the error of the levelness is between-0.1 and 0.2, and not taking away the horizontal ruler;
(2) Observing and recording simulation parameters of a sensor when a weighing instrument rises to bear, finding out the maximum and minimum difference values of the simulation parameters of a weighing mechanism, wherein the requirement is within 500-50, matching with an adjusting pad needing to be added to a supporting point at the bottom of a leveling ruler, releasing pressure of a hydraulic system, loosening a fastening bolt of a hydraulic cylinder, plugging the adjusting pad into the bottom, fastening the bolt, starting the hydraulic system again, ascending the hydraulic cylinder, observing the simulation parameters and the leveling ruler, determining whether the supporting point meets the requirement, repeating the process until the precision requirement is met, and then adjusting other weighing mechanisms according to the method;
(3) After the scale panel is adjusted, the scale panel is lifted, bolts are screwed out one by one to take out the base plate, then the bolts are screwed and replaced to connect and fasten the lifting lugs and the scale panel, the hydraulic cylinder is descended, the scale panel is compacted on the dovetail groove of the positioning seat, a clearance between the dovetail groove and the circular shaft of the owner is measured by a clearance gauge, and the requirement is 0-0.03 mm;
(4) The scale is ready for use by the end of the simulation design parameters, gap adjustment and control method for the static truck scale support mechanism and weighing mechanism.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (4)
1. A method for adjusting precision of a static truck scale is characterized by comprising the following steps:
step 1: adjusting the clearance of the supporting mechanism and designing the size;
step 2: adjusting the gap of the weighing mechanism and designing parameters of parts;
and step 3: and adjusting the horizontal precision of the scale panel.
2. The method for adjusting the precision of a static truck scale according to claim 1, wherein step 1 the adjustment of the clearance of the supporting mechanism and the design dimension are as follows:
1) The machined lifting lugs, the circular shafts, the control taper sleeves and the nuts are assembled and placed in order according to requirements, and the assembly is called as a first assembly; determining conditions: a (distance from the circle center of the circular shaft to the plane of the lifting lug), c (diameter of the circular shaft), d (size of an opening of a dovetail groove of the positioning seat), e (supporting height), f (height of the positioning seat) and j (gap between the circular shaft and the dovetail groove);
unknown conditions: b (the distance between the vertex angle of the positioning seat dovetail groove and the bottom surface), x (the distance between the vertex angle of the positioning seat dovetail groove and the circle center of the circular shaft), and x1 (the thickness of the base plate);
x1 (thickness of the base plate) = e (support height) -f (height of the positioning seat);
when the vertex angle of the dovetail groove is 90 degrees, x (the distance from the vertex angle of the dovetail groove of the positioning seat to the circle center of the circular axis) = √ c (c) 2 ÷2)；
When the vertex angle of the dovetail groove is 120 degrees, x (the distance from the vertex angle of the dovetail groove of the positioning seat to the circle center of the circular shaft) = √ (c) 2 ÷3)；
b (distance between the vertex angle of the positioning seat dovetail groove and the bottom surface) = e (support height) -x (distance between the vertex angle of the positioning seat dovetail groove and the circle center of the circular shaft) -a (distance between the circle center of the circular shaft and the plane of the lifting lug);
when the vertex angle of the dovetail groove is 90 degrees, j (a gap between a circular axis and the dovetail groove) is designed to be 5mm, x (the distance from the vertex angle of the dovetail groove of the positioning seat to the circle center of the circular axis) = (c + 10) ÷ V/2;
when the top angle of the dovetail groove is 120 degrees, the design j (a gap between a circular shaft and the dovetail groove) is 5mm, x (the distance between the top angle of the dovetail groove and the circle center of the circular shaft of the positioning seat) = (c + 10) ÷ V/3 (see table 1)
Calculating according to the conditions and the formula, when the supporting mechanism jacks up the scale panel;
table 1 shows support mechanism parts and assembly parameter references;
2) Placing each positioning seat on a steel plate, conveniently placing four cushion plates on the end faces of threaded holes of the positioning seats, measuring the combined height (e) by using a height gauge, requiring that the error of the combined height (e) is 10-10 mm, the flatness error of four measuring points is 0-0.05 mm, recording the number, and installing an adjusting pad between each cushion plate and the end face of the threaded hole of each positioning seat, so that the positioning seats are ensured to be in an equal-height state;
3) Placing the round shaft of the first assembly into a dovetail groove of the positioning seat, and connecting and fastening a bolt with the positioning seat through a through hole of the cushion plate and the lifting lug; measuring two gaps between the circular shaft and the plane of the dovetail groove by using a feeler gauge, ensuring that the error of j is 0-0.1mm, and the error of 2 times j is 0-0.15 mm, assembling and measuring the supporting structure according to the method, and recording the serial number;
4) Four jacks are placed on a steel plate, a first scale panel is stably placed on the jacks, the supporting mechanism is combined with the highest height to be used as an accurate size, then a bolt is loosened and taken out, the supporting mechanism is firstly moved to the position below the scale panel, the bolt penetrates through the scale panel, a component and a base plate are connected and fastened with a threaded hole, the supporting mechanism is not released after finishing the operation, three supporting mechanisms are arranged below the scale panel according to the method,
5) Hoisting the scale panel by using hoisting equipment to take out the jack, placing a right-angle positioning block on the scale panel handle, dropping the scale panel, clamping the right-angle positioning block between the guide way and the scale panel, completely compacting the positioning seat on the steel plate, determining the gap between the guide way and the scale panel as the reference, determining the high-end position of the supporting mechanism on the steel plate, removing the hoisting equipment, not taking out the right-angle positioning block, and at the moment, finishing the installation of the first scale panel,
6) The second scale panel only needs to be provided with two supporting mechanisms, the two scale panels are connected according to the installation and measurement method,
7) Placing a level bar at the middle position of the short side of the highest dimension of a first scale panel supporting mechanism, wherein the error of the level bar per meter is 0.02mm, placing bubbles of the level bar at the position of the highest dimension of the supporting mechanism, slowly jacking a scale panel of a lower supporting mechanism by using a jack, observing the number of bubbles moving to a grid, stopping applying force to the jack when the bubbles are at the middle position, measuring the gap between a positioning seat and a steel plate by using a feeler gauge, or directly calculating the number of the bubbles to obtain the size of the gap, then cushioning an adjusting block with a corresponding size at the gap, releasing the jack, observing whether the position of the bubbles of the level bar is at a middle position, continuously repeating the measuring operation method until the level precision of the scale panel is 0-0.15 mm, and taking away the jack,
8) The level ruler is changed to the middle position of the long side with the highest dimension of the first scale panel supporting mechanism, the jack is placed below the scale panel with the low point to apply force, so that the bubble of the level ruler is in the middle position, the adjusting pad is plugged in the gap position through measurement and calculation, the jack is released, so that the bubble position of the level ruler is in the middle position, the level precision is 0-0.2 mm,
9) Measuring and adjusting the height difference of the other two support structures according to the method, ensuring that the levelness of the scale panel is within 0-30 mm, and finishing the adjustment of the first scale panel;
10 Repeating the above steps to finish the levelness of the second scale panel, taking away the jack, finishing the precision adjustment of the static automobile scale supporting mechanism and the scale panel, and taking out the right-angle positioning block.
3. The static truck scale accuracy adjustment method according to claim 1, characterized in that step 2: the clearance adjustment and the part design parameters of the weighing mechanism are as follows:
1) Sleeving all cone pressing heads into the positions of the mounting holes of the scale panel, sequentially measuring the dimension h by using an inside micrometer, wherein the error is 0-0.05 mm, and numbering and recording;
2) The hydraulic cylinder is placed on the steel plate, the jacking sleeve fastening locking nut is sequentially installed, the sensor is placed, the adjusting sleeve is covered, and the tip cone is screwed into the threaded hole of the adjusting sleeve to the bottom to form a weighing mechanism;
3) When the hydraulic cylinder is in the minimum range, the height of all weighing mechanisms h2 is measured by height gauges and recorded;
4) Connecting a hydraulic loop, and fastening an oil pipe installation drawing to each weighing mechanism hydraulic cylinder joint; the system is adjusted to low pressure, so that the weighing mechanism slowly rises to the top;
5) When the hydraulic cylinder is in the maximum measuring range, the height of all weighing mechanisms h1 is measured by height gauges, and the height gauges are numbered and recorded;
6) Comparing the height of each weighing mechanism h1 and h in the maximum measuring range of the hydraulic cylinder, wherein the height of h1 is certainly lower than h, rotating the tip cone to rise to enable the height error between h1 and h to be 0-0.03mm, and then fastening the locknut;
7) The hydraulic cylinder is decompressed, the weighing mechanism falls to the bottom, and the height h2 is measured by a height gauge, so that the error x2 is ensured to be within-0.1-0.2 mm;
8) The height of the frame y is not required to be in contact with the cone pressure head when the weighing mechanism does not weigh the minimum measuring range, and a gap of 20mm is preferably reserved;
9) x3 is 10mm larger than the maximum range of the hydraulic cylinder, so that the conical pressure head is ensured to be centered, and the sealing ring moves in the frame hole;
10 After parameter size adjustment of the weighing mechanism is finished, dismantling the oil pipe, jacking up the scale panels one by using a jack, placing a corresponding weighing mechanism below a conical pressing head, centering a conical pressing head hole and a top conical head, then releasing the jack, adjusting the conical pressing head hole again by hand to be centered with the weighing mechanism, after the position of each hydraulic cylinder is determined, applying force by using the jack, moving out the weighing mechanism, taking down a sensor, an adjusting sleeve and a top cone which are connected together, and drilling all steel plate threaded holes in a matched manner;
11 The hydraulic cylinder is fastened with a steel plate bolt, the hydraulic cylinder is wrapped by a frame, a sealing ring is installed on a tip cone and then penetrates through a frame hole, an upper contact and a lower contact of a sensor are connected with inner holes of a jacking sleeve and an adjusting sleeve, and a jack is released; fixing the frame and the positioning seat in a welding mode, positioning the weighing mechanism according to the method, and combining and fixing the weighing mechanism with the frame;
12 Finishing the adjustment of the measurement precision of the static automobile scale weighing mechanism;
table 2:
and the table 2 shows the values of the clearance parameters between the tip cone and the cone pressure head when the weighing mechanism has the minimum measuring range.
4. The method for adjusting the precision of a static truck scale according to claim 1, wherein in step 3, the adjustment of the horizontal precision of the panel is performed as follows:
(1) Connecting a hydraulic cylinder and an oil pipe, placing a horizontal ruler at the long edge and the short edge of the scale panel, starting a system to measure the levelness of the scale panel when the scale panel ascends or descends, ensuring that the error of the levelness is between-0.1 and 0.2, and not taking away the horizontal ruler;
(2) Observing and recording simulation parameters of a sensor when a weighing instrument rises to bear, finding out the maximum and minimum difference values of the simulation parameters of a weighing mechanism, wherein the requirement is within 500-50, matching with an adjusting pad needing to be added to a supporting point at the bottom of a leveling ruler, releasing pressure of a hydraulic system, loosening a fastening bolt of a hydraulic cylinder, plugging the adjusting pad into the bottom, fastening the bolt, starting the hydraulic system again, ascending the hydraulic cylinder, observing the simulation parameters and the leveling ruler, determining whether the supporting point meets the requirement, repeating the process until the precision requirement is met, and then adjusting other weighing mechanisms according to the method;
(3) After the scale panel is adjusted, the scale panel is lifted, bolts are screwed out one by one to take out the base plate, then the bolts are screwed and replaced to connect and fasten the lifting lugs and the scale panel, the hydraulic cylinder is descended, the scale panel is compacted on the dovetail groove of the positioning seat, a clearance between the dovetail groove and the circular shaft of the owner is measured by a clearance gauge, and the requirement is 0-0.03 mm;
(4) The scale is ready for use by the end of the simulation design parameters, gap adjustment and control method for the static truck scale support mechanism and weighing mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110682085.6A CN115493678A (en) | 2021-06-19 | 2021-06-19 | Static truck scale precision adjusting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110682085.6A CN115493678A (en) | 2021-06-19 | 2021-06-19 | Static truck scale precision adjusting method |
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