A static automobile scale precision adjustment method

Abstract

The present invention relates to a method for adjusting the accuracy of a static vehicle scale. The method comprises the following steps: Step 1: adjusting the support mechanism gap and designing its dimensions; Step 2: adjusting the weighing mechanism gap and component design parameters; and Step 3: adjusting the scale panel's horizontal accuracy. This technical solution effectively eliminates reliance solely on sensor analog parameters to adjust the scale panel's level, extending the service life of the static vehicle scale and ensuring the required overweight capacity. This adjustment method eliminates safety hazards, is simple to implement, and requires minimal human and material resources.

Description

Technical Field

[0001] The invention relates to a method for adjusting the precision of a static automobile scale, and belongs to the technical field of static automobile scales. Background Art

[0002] Dynamic truck scales are the most commonly used today. The violent, irregular shaking of vehicles on and off the scales creates significant impact with the screw stoppers. This can cause the concrete foundation to sink over time, severely wear the load cell contacts, reducing their lifespan and weighing accuracy, and can also cause partial deformation of the scale panel. Static truck scales, comprising a support mechanism, a weighing mechanism, and a hydraulic control system, offer far greater accuracy than dynamic truck scales. While their structure is more complex, their stability, failure rate, overweight capacity, and lifespan far exceed those of similar products. However, installation requires higher precision than dynamic truck scales, making troubleshooting time-consuming and difficult, resulting in reduced production capacity. Therefore, a new solution is urgently needed to address these technical issues. Summary of the Invention

[0003] This invention addresses the existing issues and provides a static truck scale accuracy adjustment method. This technical solution effectively eliminates the reliance on sensor analog parameters to adjust the scale panel level, extending the service life of the static truck scale and ensuring the required overweighing capacity. This adjustment method eliminates safety hazards, simplifies the process, and requires minimal manpower and material resources.

[0004] In order to achieve the above object, the technical solution of the present invention is as follows: a method for adjusting the accuracy of a static automobile scale, the method comprising the following steps:

[0005] Step 1: Support mechanism clearance adjustment and design dimensions (reference values);

[0006] Step 2: Weighing mechanism gap adjustment and component design parameters;

[0007] Step 3: Adjust the horizontal accuracy of the scale panel.

[0008] Step 1: Adjust the support mechanism gap and design the dimensions as follows:

[0009] 1) Assemble the processed lifting lug, circular shaft, control taper sleeve and nut as required and place them neatly, which is called assembly 1. Determine the following conditions: a (distance from the circular shaft center to the lifting lug plane), c (circular shaft diameter), d (opening size of the locating seat dovetail slot), e (support height), f (locating seat height), and j (clearance between the circular shaft and the dovetail slot).

[0010] Unknown conditions: b (the distance between the top corner and the bottom surface of the dovetail groove of the locating seat), x (the distance between the top corner of the dovetail groove of the locating seat and the center of the circular axis), x1 (the thickness of the pad);

[0011] x1 (pad thickness) = e (support height) - f (positioning seat height);

[0012] When the dovetail groove top angle is 90 degrees, x (the distance from the dovetail groove top angle of the positioning seat to the center of the circular axis) = √ (c 2 ÷2)

[0013] When the dovetail groove top angle is 120 degrees, x (the distance from the dovetail groove top angle of the positioning seat to the center of the circular axis) = √ (c 2 ÷3)

[0014] b (distance between the top angle and bottom surface of the dovetail groove of the locating seat) = e (support height) - x (distance between the top angle of the dovetail groove of the locating seat and the center of the circular shaft) - a (distance between the center of the circular shaft and the plane of the lifting lug);

[0015] When the dovetail groove top angle is 90 degrees, the design j (gap between the circular shaft and the dovetail groove) is 5mm, and x (the distance from the dovetail groove top angle of the locating seat to the center of the circular shaft) = (c+10) ÷ √2;

[0016] When the dovetail groove top angle is 120 degrees, the design j (gap between the circular shaft and the dovetail groove) is 5mm, and x (the distance from the dovetail groove top angle of the locating seat to the center of the circular shaft) = (c+10) ÷ √3 (see Table 1)

[0017] According to the above conditions and formula, when the support mechanism lifts up the scale panel;

[0018] Table 1 is a reference for the support mechanism components and assembly parameters;

[0019]

[0020] 2) Place each locating seat on the steel plate, and place the four pads on the end faces of the threaded holes of the locating seat. Use a height gauge to measure the combined height (e). The error of the combined height (e) is required to be within 10-10mm, and the flatness error of the four measuring points is within 0-0.05mm. Record the numbers and install the adjustment pads between the pads and the end faces of the threaded holes of the locating seat to ensure that the locating seat is at the same height.

[0021] 3) Place the round shaft of component 1 into the dovetail groove of the locating seat, and fasten the bolts through the lifting lugs and the through holes of the pad to the threaded connection of the locating seat. Use a feeler gauge to measure the clearance between the round shaft and the dovetail groove plane, ensuring that the j error is within 0-0.1mm and the 2 times j error is within 0-0.15mm. Assemble and measure the support structure in this way, and record the number.

[0022] 4) Place four jacks on the steel plate, and place the first scale panel steadily on the jacks. Use the highest support mechanism combination as the precise size, then loosen and remove the bolts. First move to the bottom of the scale panel, pass the bolts through the scale panel, and connect and tighten the components, pads and threaded holes. After the support mechanism is completed, do not release the jacks. Install the three support mechanisms under this scale panel in this way (note that the circular axis of the scale panel connection position should be installed parallel to it);

[0023] 5) Use the lifting equipment to lift the scale panel and take out the jack. Place the right-angle locating block on the scale handle. Lower the scale panel. The right-angle locating block is stuck between the ramp and the scale panel. The locating seat is completely pressed on the steel plate. Use the ramp as a reference to determine the gap with the scale panel and the high-end position of the support mechanism on the steel plate. Remove the lifting equipment without taking out the right-angle locating block. At this point, the first scale panel is installed.

[0024] 6) The second scale panel only needs to be installed with two supporting mechanisms. Connect the two scale panels according to the above installation and measurement methods.

[0025] 7) Place the spirit level in the middle of the short side of the highest dimension of the support mechanism of the first scale panel. The error of the spirit level is 0.02mm per meter. The bubble of the spirit level is at the highest dimension position of the support mechanism. Use the jack to slowly lift the scale panel of the lower support mechanism. At this time, observe the bubble moving to the grid number. When the bubble is in the middle position, stop applying force to the jack. Use a feeler gauge to measure the gap between the positioning seat and the steel plate, or directly calculate the number of bubble grids to obtain the gap size, and then place the adjustment pad of the corresponding size in the gap. Release the jack and observe whether the bubble position of the spirit level is in the middle position. Repeat the measurement operation method until the horizontal accuracy of the scale panel is 0-0.15mm. Remove the jack.

[0026] 8) Move the spirit level to the middle position of the longest side of the highest dimension of the support mechanism of the first scale panel, place the jack under the low point of the scale panel and apply force to make the bubble of the spirit level in the middle position. After measurement and calculation, plug the adjustment pad in the gap, release the jack, make the bubble of the spirit level in the middle position, and the horizontal accuracy is 0-0.2mm.

[0027] 9) Measure and adjust the height difference of the other two supporting structures of this block according to the above method to ensure that the levelness of the scale panel is within 0-30mm. The adjustment of the first scale panel is completed;

[0028] 10) Repeat the above steps to complete the levelness of the second scale panel, remove the jack, the static automobile scale support mechanism and the scale panel accuracy adjustment is completed, and remove the right-angle positioning block.

[0029] Step 2: Weighing mechanism gap adjustment and component design parameters, as follows:

[0030] 1) Put all cone indenters into the mounting holes of the scale panel, and use an inside micrometer to measure the size of h in turn, with an error of 0-0.05mm, and record the numbers;

[0031] 2) Place the hydraulic cylinder on the steel plate, install the lifting sleeve and tighten the lock nut in sequence, put in the sensor, cover the adjusting sleeve, screw the top cone into the threaded hole of the adjusting sleeve and bottom it out to form the weighing mechanism;

[0032] 3) When the hydraulic cylinder is at its minimum range, use a height gauge to measure the height of all weighing mechanisms h2 and record it;

[0033] 4) Connect the hydraulic circuit and tighten the oil pipe installation drawing to each weighing mechanism hydraulic cylinder joint; adjust the system to low pressure and slowly raise the weighing mechanism to the top;

[0034] 5) When the hydraulic cylinder is at its maximum range, use a height gauge to measure the height of all weighing mechanisms h1 and record them by number;

[0035] 6) Compare the heights of h1 and h of each weighing mechanism at the maximum range of the hydraulic cylinder. The height of h1 must be lower than h. Rotate the top cone upwards to make the height error between h1 and h 0-0.03mm, then tighten the locknut.

[0036] 7) The hydraulic cylinder is depressurized, and the weighing mechanism falls back to the bottom. Use a height gauge to measure the height h2 and ensure that the error of x2 is within -0.1-0.2mm;

[0037] 8) The height of frame y should not contact the cone indenter when the weighing mechanism is not weighing at the minimum range, and a gap of 20 mm is preferred;

[0038] 9) x3 should be 10mm larger than the maximum range of the hydraulic cylinder to ensure that the cone pressure head is centered and the sealing ring moves in the frame hole;

[0039] 10) After the weighing mechanism parameters and dimensions are adjusted, remove the oil pipes and use a jack to lift the scale panels one by one. Place the corresponding weighing mechanism under the cone pressure head, aligning the cone pressure head hole with the top cone. Then release the jack and manually adjust the cone pressure head hole and the weighing mechanism again. After the position of each hydraulic cylinder is determined, apply force with the jack, remove the weighing mechanism, remove the sensor and the connected adjustment sleeve and top cone, and drill all the threaded holes in the steel plate.

[0040] 11) Fasten the hydraulic cylinder and steel plate bolts, wrap the frame around the hydraulic cylinder, install the sealing ring on the top cone and then pass it through the frame hole, connect the upper and lower contacts of the sensor to the inner holes of the lifting sleeve and the adjustment sleeve, release the jack; fix the frame and positioning seat by welding. Use the above method to position the weighing mechanism and fix it to the frame;

[0041] 12) At this point, the measurement accuracy adjustment of the static vehicle scale weighing mechanism is completed.

[0042] Table 2 shows the parameter values ​​of the gap between the top cone and the cone pressure head when the weighing mechanism has the minimum range.

[0043] Table 2:

[0044]

[0045] Step 3: Adjust the horizontal accuracy of the scale panel, as follows:

[0046] (1) Connect the hydraulic cylinder and the oil pipe, place the level ruler on the long and short sides of the scale panel, start the system to measure the levelness of the scale panel when it rises or falls, and ensure that the levelness error is between -0.1 and 0.2. Do not remove the level ruler;

[0047] (2) Observe and record the analog parameters of the sensor when the weighing instrument rises and loads, find out the maximum and minimum difference between the analog parameters of the weighing mechanism, which should be within 500-50, and use the level ruler to prove that the adjustment pads need to be added to the bottom support point, release the pressure of the hydraulic system, loosen the fastening bolts of the hydraulic cylinder, insert the adjustment pads into the bottom, tighten the bolts, and then start the hydraulic system. The hydraulic cylinder rises, observe the analog parameters and the level ruler, and determine whether this support point meets the requirements. Repeat this process until it meets the above accuracy requirements, and then adjust other weighing mechanisms according to this method;

[0048] (3) After the scale panel is adjusted, lift the scale panel, unscrew the bolts one by one and take out the pads, then tighten the replacement bolts to connect the lugs to the scale panel. Lower the hydraulic cylinder and press the scale panel firmly on the dovetail groove of the positioning seat. Use a feeler gauge to measure the contact gap between the dovetail groove and the owner's circular shaft. The requirement is 0-0.03mm.

[0049] (4) The simulation design parameters, gap adjustment and control methods of the static automobile scale support mechanism and weighing mechanism are completed, and the scale can be put into use.

[0050] Compared with the prior art, the advantages of the present invention are as follows:

[0051] 1. Use right-angle positioning blocks to quickly determine the installation gap between the truck scale and the approach entrance and exit, which is beneficial to prevent the gap from changing during repeated lifting of the scale panel, affecting the subsequent installation accuracy adjustment.

[0052] 2. Based on the 5mm gap between the dovetail slot of the circular shaft and the locating seat, EF calculates the pad height. The support mechanism is installed with the pad at the factory, controlling this gap and eliminating the need for post-installation adjustment. It is placed safely and stably on the steel plate, eliminating the safety risks associated with repeated lifting or using a jack to tilt the displacement scale panel.

[0053] 3. The preset parameters in Tables 1 and 2 are set to integers for ease of calculation, reference, reasonable and standardized manufacturing and control of gaps, and convenient adjustment of the scale panel level.

[0054] 4. Use measuring tools to obtain the required adjustment accuracy, and get rid of the previous reliance on analog parameters output by weighing instruments as adjustment standards, which results in uneven pressure on the zero sensor, height difference of the weighing mechanism on the scale panel, extremely poor levelness of the scale panel, and severe wear of the upper and lower contacts of the sensor.

[0055] 5. With reference to the circular shaft, there is a 5mm gap between the dovetail groove of the locating seat and both sides, which effectively controls the height of the locating seat and informs the maximum range of the weighing mechanism and the selection of the hydraulic cylinder model.

[0056] 6. This method requires the scale base steel plate to be highly level. If the levelness is poor, it can be achieved by adding adjustment pads under the positioning seat.

[0057] 7. This adjustment method relies on the preset values ​​in Tables 1 and 2. At 90 and 120 degrees, x = √(c2÷2) and x = √(c2÷3), respectively. This ensures that at the maximum range of the hydraulic cylinder, the top cone is in full contact with the cone pressure head, the scale panel maintains horizontal accuracy, and the pressure is evenly distributed. At the minimum range, the scale panel is supported on the positioning dovetail groove, the top cone is controlled within the cone pressure head, and the sensor is absolutely depressurized.

[0058] The 8.90 and 120 dovetail grooves have a large contact angle, which makes the car get on and off the scale more stable and without shaking, and the dust is easy to clean, getting rid of the adverse effects of irregular impact of dynamic car scales.

[0059] 9. This method relies on data support to control the static truck scale to improve installation accuracy, ensure that the weighing mechanism meets the requirements for improved accuracy, ensure the service life of components and reduce mechanical scale down accidents. This static truck scale is based on independent design, controls component accuracy, presets accuracy parameters, and strengthens the adjustment gap requirements after calculation, effectively eliminating the need to rely solely on sensor simulation parameters to adjust the scale panel level, extending the service life of the static truck scale and overweighing requirements. This adjustment method eliminates safety hazards, is simple to operate, and requires less manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 To determine the height dimension diagram of the scale panel;

[0061] Figure 2 Schematic diagram of measuring the gap between the circular shaft of the support mechanism and the dovetail slot;

[0062] Figure 3 This is the static car scale panel inlet and outlet gap control diagram;

[0063] Figure 4 This is a diagram showing the parameters of the support mechanism;

[0064] Figure 5 This is the diagram showing the parameters of the weighing mechanism;

[0065] Figure 6 This is a diagram for adjusting the level of the scale panel.

[0066] In the figure: 1 - right angle positioning block, 2 - guideway, 3 - scale panel, 4 - bolt, 5 - lifting ear, 6 - round shaft, 7 - screw, 8 - positioning seat, 9 - pad 10 - steel plate 11 - foundation 12 - jack 13 - feeler gauge 14 - height gauge 15 - level 16 - a (distance from the center of the round shaft to the lifting ear plane) 17 - b (distance from the top angle to the bottom surface of the positioning seat dovetail groove) 18 - c (round shaft diameter) 19 - d (opening size of the positioning seat dovetail groove) 20 - e (support height) 1—f (height of positioning seat) 22—j (gap between circular shaft and dovetail groove) 23—x (distance from the top angle of the dovetail groove of positioning seat to the center of circular shaft) 24—x1 (thickness of pad) 25—h (distance from the bottom surface of the cone hole of the conical pressure head to the steel plate) 26—h1 (maximum range of hydraulic cylinder) 27—h2 (minimum range of hydraulic cylinder) 28—x2 (gap between the top cone and the conical pressure head) 29—x3 height of lifting hole 30—y (height of frame) 31—weighing mechanism 32—frame 33—inside micrometer DETAILED DESCRIPTION

[0067] In order to deepen the understanding of the present invention, this embodiment is described in detail below with reference to the accompanying drawings.

[0068] Example 1: See Figure 1 , a static automobile scale precision adjustment method, the method comprising the following steps:

[0069] Step 1: Support mechanism clearance adjustment and design dimensions (reference values);

[0070] Step 2: Weighing mechanism gap adjustment and component design parameters;

[0071] Step 3: Adjust the horizontal accuracy of the scale panel.

[0072] Step 1: Adjust the support mechanism gap and design the dimensions as follows:

[0073] 1) Assemble the processed lifting lug, circular shaft, control taper sleeve and nut as required and place them neatly, which is called assembly 1. Determine the following conditions: a (distance from the circular shaft center to the lifting lug plane), c (circular shaft diameter), d (opening size of the locating seat dovetail slot), e (support height), f (locating seat height), and j (clearance between the circular shaft and the dovetail slot).

[0074] Unknown conditions: b (the distance between the top corner and the bottom surface of the dovetail groove of the locating seat), x (the distance between the top corner of the dovetail groove of the locating seat and the center of the circular axis), x1 (the thickness of the pad);

[0075] x1 (pad thickness) = e (support height) - f (positioning seat height);

[0076] When the dovetail groove top angle is 90 degrees, x (the distance from the dovetail groove top angle of the positioning seat to the center of the circular axis) = √ (c 2 ÷2)

[0077] When the dovetail groove top angle is 120 degrees, x (the distance from the dovetail groove top angle of the positioning seat to the center of the circular axis) = √ (c 2 ÷3)

[0078] b (distance between the top angle and bottom surface of the dovetail groove of the locating seat) = e (support height) - x (distance between the top angle of the dovetail groove of the locating seat and the center of the circular shaft) - a (distance between the center of the circular shaft and the plane of the lifting lug);

[0079] When the dovetail groove top angle is 90 degrees, the design j (gap between the circular shaft and the dovetail groove) is 5mm, and x (the distance from the dovetail groove top angle of the locating seat to the center of the circular shaft) = (c+10) ÷ √2;

[0080] When the dovetail groove top angle is 120 degrees, the design j (gap between the circular shaft and the dovetail groove) is 5mm, and x (the distance from the dovetail groove top angle of the locating seat to the center of the circular shaft) = (c+10) ÷ √3 (see Table 1)

[0081] According to the above conditions and formula, when the support mechanism lifts up the scale panel;

[0082] Table 1 shows the supporting mechanism components and assembly parameters;

[0083]

[0084] 2) Place each locating seat on the steel plate, and place the four pads on the end faces of the threaded holes of the locating seat. Use a height gauge to measure the combined height (e). The error of the combined height (e) is required to be within 10-10mm, and the flatness error of the four measuring points is within 0-0.05mm. Record the numbers and install the adjustment pads between the pads and the end faces of the threaded holes of the locating seat to ensure that the locating seat is at the same height.

[0085] 3) Place the round shaft of component 1 into the dovetail groove of the locating seat, and fasten the bolts through the lifting lugs and the through holes of the pad to the threaded connection of the locating seat. Use a feeler gauge to measure the clearance between the round shaft and the dovetail groove plane, ensuring that the j error is within 0-0.1mm and the 2 times j error is within 0-0.15mm. Assemble and measure the support structure in this way, and record the number.

[0086] 4) Place four jacks on the steel plate, and place the first scale panel steadily on the jacks. Use the highest support mechanism combination as the precise size, then loosen and remove the bolts. First move to the bottom of the scale panel, pass the bolts through the scale panel, and connect and tighten the components, pads and threaded holes. After the support mechanism is completed, do not release the jacks. Install the three support mechanisms under this scale panel in this way. (Note that the circular axis of the scale panel connection position should be installed parallel to it)

[0087] 5) Use the lifting equipment to lift the scale panel and take out the jack. Place the right-angle locating block on the scale handle. Lower the scale panel. The right-angle locating block is stuck between the ramp and the scale panel. The locating seat is completely pressed on the steel plate. Use the ramp as a reference to determine the gap with the scale panel and the high-end position of the support mechanism on the steel plate. Remove the lifting equipment without taking out the right-angle locating block. At this point, the first scale panel is installed.

[0088] 6) The second scale panel only needs to be installed with two supporting mechanisms. Connect the two scale panels according to the above installation and measurement methods.

[0089] 7) Place the spirit level in the middle of the short side of the highest dimension of the support mechanism of the first scale panel. The error of the spirit level is 0.02mm per meter. The bubble of the spirit level is at the highest dimension position of the support mechanism. Use the jack to slowly lift the scale panel of the lower support mechanism. At this time, observe the bubble moving to the grid number. When the bubble is in the middle position, stop applying force to the jack. Use a feeler gauge to measure the gap between the positioning seat and the steel plate, or directly calculate the number of bubble grids to obtain the gap size, and then place the adjustment pad of the corresponding size in the gap. Release the jack and observe whether the bubble position of the spirit level is in the middle position. Repeat the measurement operation method until the horizontal accuracy of the scale panel is 0-0.15mm. Remove the jack.

[0090] 8) Move the spirit level to the middle position of the longest side of the highest dimension of the support mechanism of the first scale panel, place the jack under the low point of the scale panel and apply force to make the bubble of the spirit level in the middle position. After measurement and calculation, plug the adjustment pad in the gap, release the jack, make the bubble of the spirit level in the middle position, and the horizontal accuracy is 0-0.2mm.

[0091] 9) Measure and adjust the height difference of the other two supporting structures of this block according to the above method to ensure that the levelness of the scale panel is within 0-30mm. The adjustment of the first scale panel is completed;

[0092] 10) Repeat the above steps to complete the levelness of the second scale panel, remove the jack, the static automobile scale support mechanism and the scale panel accuracy adjustment is completed, and remove the right-angle positioning block.

[0093] Step 2: Weighing mechanism gap adjustment and component design parameters, as follows:

[0094] 1) Put all cone indenters into the mounting holes of the scale panel, and use an inside micrometer to measure the size of h in turn, with an error of 0-0.05mm, and record the numbers;

[0095] 2) Place the hydraulic cylinder on the steel plate, install the lifting sleeve and tighten the lock nut in sequence, put in the sensor, cover the adjusting sleeve, screw the top cone into the threaded hole of the adjusting sleeve and bottom it out to form the weighing mechanism;

[0096] 3) When the hydraulic cylinder is at its minimum range, use a height gauge to measure the height of all weighing mechanisms h2 and record it;

[0097] 4) Connect the hydraulic circuit and tighten the oil pipe installation drawing to each weighing mechanism hydraulic cylinder joint; adjust the system to low pressure and slowly raise the weighing mechanism to the top;

[0098] 5) When the hydraulic cylinder is at its maximum range, use a height gauge to measure the height of all weighing mechanisms h1 and record them by number;

[0099] 6) Compare the heights of h1 and h of each weighing mechanism at the maximum range of the hydraulic cylinder. The height of h1 must be lower than h. Rotate the top cone upwards to make the height error between h1 and h 0-0.03mm, then tighten the locknut.

[0100] 7) The hydraulic cylinder is depressurized, and the weighing mechanism falls back to the bottom. Use a height gauge to measure the height h2 and ensure that the error of x2 is within -0.1-0.2mm;

[0101] 8) The height of frame y should not contact the cone indenter when the weighing mechanism is not weighing at the minimum range, and a gap of 20 mm is preferred;

[0102] 9) x3 should be 10mm larger than the maximum range of the hydraulic cylinder to ensure that the cone pressure head is centered and the sealing ring moves in the frame hole;

[0103] 10) After the weighing mechanism parameters and dimensions are adjusted, remove the oil pipes and use a jack to lift the scale panels one by one. Place the corresponding weighing mechanism under the cone pressure head, aligning the cone pressure head hole with the top cone. Then release the jack and manually adjust the cone pressure head hole and the weighing mechanism again. After the position of each hydraulic cylinder is determined, apply force with the jack, remove the weighing mechanism, remove the sensor and the connected adjustment sleeve and top cone, and drill all the threaded holes in the steel plate.

[0104] 11) Fasten the hydraulic cylinder and steel plate bolts, wrap the frame around the hydraulic cylinder, install the sealing ring on the top cone and then pass it through the frame hole, connect the upper and lower contacts of the sensor to the inner holes of the lifting sleeve and the adjustment sleeve, release the jack; fix the frame and positioning seat by welding. Use the above method to position the weighing mechanism and fix it to the frame;

[0105] 12) At this point, the measurement accuracy adjustment of the static vehicle scale weighing mechanism is completed.

[0106] Table 2 shows the parameter values ​​of the gap between the top cone and the cone pressure head when the weighing mechanism has the minimum range.

[0107] Table 2:

[0108]

[0109] Step 3: Adjust the horizontal accuracy of the scale panel, as follows:

[0110] (1) Connect the hydraulic cylinder and the oil pipe, place the level ruler on the long and short sides of the scale panel, start the system to measure the levelness of the scale panel when it rises or falls, and ensure that the levelness error is between -0.1 and 0.2. Do not remove the level ruler;

[0111] (2) Observe and record the analog parameters of the sensor when the weighing instrument rises and loads, find out the maximum and minimum difference between the analog parameters of the weighing mechanism, which should be within 500-50, and use the level ruler to prove that the adjustment pads need to be added to the bottom support point, release the pressure of the hydraulic system, loosen the fastening bolts of the hydraulic cylinder, insert the adjustment pads into the bottom, tighten the bolts, and then start the hydraulic system. The hydraulic cylinder rises, observe the analog parameters and the level ruler, and determine whether this support point meets the requirements. Repeat this process until it meets the above accuracy requirements, and then adjust other weighing mechanisms according to this method;

[0112] (3) After the scale panel is adjusted, lift the scale panel, unscrew the bolts one by one and take out the pads, then tighten the replacement bolts to connect the lugs to the scale panel. Lower the hydraulic cylinder and press the scale panel firmly on the dovetail groove of the positioning seat. Use a feeler gauge to measure the contact gap between the dovetail groove and the owner's circular shaft. The requirement is 0-0.03mm.

[0113] (4) The simulation design parameters, gap adjustment and control methods of the static automobile scale support mechanism and weighing mechanism are completed, and the scale can be put into use.

[0114] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions fall within the scope of protection of the claims of the present invention.

Claims

1. A static automobile scale precision adjustment method, characterized in that: The method comprises the following steps: Step 1: Adjust the gap and design the size of the support mechanism; Step 2: Weighing mechanism gap adjustment and component design parameters; Step 3: Adjust the horizontal accuracy of the scale panel; Step 1 is as follows: 1) Assemble the processed lifting lugs, round shafts, control cone sleeves and nuts as required and place them neatly, which is called component one; Determine the conditions: a) distance from the center of the circular shaft to the plane of the lifting ear, c) diameter of the circular shaft, d) opening size of the dovetail slot of the locating seat, e) support height, f) height of the locating seat, j) clearance between the circular shaft and the dovetail slot; Unknown conditions: b the distance between the top angle and bottom surface of the dovetail groove of the locating seat, x the distance between the top angle and the center of the circular axis, x1 the thickness of the pad; x1 pad thickness = e support height - f positioning seat height; When the dovetail groove top angle is 90 degrees, the distance from the dovetail groove top angle of the x positioning seat to the center of the circular axis = √(c 2 ÷2); When the dovetail groove top angle is 120 degrees, the distance from the dovetail groove top angle of the x positioning seat to the center of the circular axis = √(c 2 ÷3); b. Distance between the top angle and bottom surface of the dovetail groove of the locating seat = e. Support height - x. Distance from the top angle of the dovetail groove of the locating seat to the center of the circular shaft - a. Distance from the center of the circular shaft to the plane of the lifting lug; When the dovetail groove top angle is 90 degrees, the clearance between the j circular shaft and the dovetail groove is designed to be 5mm, and the distance from the dovetail groove top angle of the x positioning seat to the center of the circular shaft = (c+10)÷√2; When the dovetail groove top angle is 120 degrees, the clearance between the j circular shaft and the dovetail groove is designed to be 5mm, and the distance from the dovetail groove top angle of the x positioning seat to the center of the circular shaft = (c+10)÷√3, Calculate the supporting mechanism components and assembly parameters when the support mechanism lifts the scale panel based on the above conditions and formulas. 2) Place each locating seat on the steel plate, and place the four pads on the end faces of the threaded holes of the locating seat. Use a height gauge to measure the support height. The support height error is required to be within 10-10mm, and the flatness error of the four measuring points is within 0-0.05mm. Install the adjustment pad between the pad and the end face of the threaded hole of the locating seat to ensure that the locating seat is at the same height. 3) Place the round shaft of component 1 into the dovetail groove of the positioning seat, and fasten the bolts through the lifting ears and the through holes of the pad to the threaded connection of the positioning seat; use a feeler gauge to measure the gap between the round shaft and the dovetail groove plane, ensuring that the j error is within 0-0.1mm and the 2 times j error is within 0-0.15mm. Assemble and measure the support mechanism in this way. 4) Place four jacks on the steel plate, place the first scale panel steadily on the jacks, take the highest support height of the support mechanism as the reference size, then loosen and remove the bolts, first move to the bottom of the scale panel, pass the bolts through the scale panel, connect the components, pads and threaded holes, and tighten the support mechanism. Install the three support mechanisms under the scale panel in this way. 5) Use the lifting equipment to lift the scale panel and take out the jack, put the right-angle positioning block on the scale panel, drop the scale panel, and the right-angle positioning block is stuck between the approach and the scale panel. The positioning seat is completely pressed on the steel plate. Determine the gap between the approach and the scale panel based on the reference, determine the high-end position of the support mechanism on the steel plate, remove the lifting equipment, and now the first scale panel is installed. 6) The second scale panel only needs to be installed with two supporting mechanisms. Connect the two scale panels according to the above installation and measurement methods. 7) Place the spirit level in the middle of the short side of the highest dimension of the support mechanism of the first scale panel, with the spirit level bubble at the highest dimension position of the support mechanism. Use the jack to slowly lift the support mechanism scale panel. At this time, observe the number of grids that the bubble moves. When the bubble is in the middle position, stop applying force to the jack. Use a feeler gauge to measure the gap between the positioning seat and the steel plate, or directly calculate the number of bubble grids to obtain the gap size, and then place an adjustment pad of the corresponding size in the gap. Release the jack and observe whether the spirit level bubble is in the middle position. Repeat the measurement operation until the horizontal accuracy of the scale panel is 0-0.15mm. Remove the jack. 8) Move the spirit level to the middle position of the longest side of the highest dimension of the support mechanism of the first scale panel, place the jack under the low point of the scale panel and apply force to make the bubble of the spirit level in the middle position. After measurement and calculation, plug the adjustment pad in the gap, release the jack, make the bubble of the spirit level in the middle position, and the horizontal accuracy is 0-0.2mm. 9) Measure and adjust the height difference of the other two supporting structures according to steps 7) and 8) to ensure that the levelness of the scale panel is within 0-30mm. The adjustment of the first scale panel is completed. 10) Repeat steps 2) to 9) to complete the leveling of the second scale panel, remove the jack, and the accuracy adjustment of the static automobile scale support mechanism and the scale panel is completed. Remove the right-angle positioning block; Step 2: Weighing mechanism gap adjustment and component design parameters, as follows: Cone pressure head 1) Put all the cone indenters into the mounting holes of the scale panel, and use an inside micrometer to measure the distance h between the bottom of the cone hole of the cone indenter and the steel plate, with an error of 0-0.05mm; 2) Place the hydraulic cylinder on the steel plate, install the lifting sleeve and tighten the lock nut in sequence, put in the sensor, cover the adjusting sleeve, screw the top cone into the threaded hole of the adjusting sleeve and bottom it out to form the weighing mechanism; 3) When the hydraulic cylinder reaches the minimum range h2, use a height gauge to measure the height of all weighing mechanisms h2 and record it; 4) Tighten the joints of each hydraulic cylinder of the weighing mechanism; adjust the system to low pressure and allow the weighing mechanism to slowly rise to the top; 5) When the hydraulic cylinder reaches its maximum range h1, use a height gauge to measure the height of all weighing mechanisms h1; 6) Compare the heights of h1 and h of each weighing mechanism of the maximum range of the hydraulic cylinder, rotate the top cone to rise, make the height error of h1 and h 0-0.03mm, and then tighten the lock nut; 7) Release the pressure of the hydraulic cylinder, and the weighing mechanism falls back to the bottom. Then use a height gauge to measure the height h2 to ensure that the error of the gap x2 between the top cone and the cone pressure head is within -0.1-0.2mm; 8) The height of frame y must not contact the cone indenter when the weighing mechanism is not weighing at the minimum range, with a gap of 20 mm; 9) The height of the lifting hole x3 must be greater than the maximum range of the hydraulic cylinder by 10mm to ensure that the cone pressure head is centered and the sealing ring moves in the frame hole; 10) After the parameters and dimensions of the weighing mechanism are adjusted, remove the oil pipes and lift the scale panels one by one with a jack. Place the corresponding weighing mechanism under the cone pressure head, align the cone pressure head hole with the top cone, then release the jack. Manually adjust the cone pressure head hole and the weighing mechanism again. After the position of each hydraulic cylinder is determined, apply force with the jack, remove the weighing mechanism, remove the sensor and the connected adjustment sleeve and top cone, and drill all the threaded holes in the steel plate. 11) Fasten the hydraulic cylinder and the steel plate with bolts. Wrap the hydraulic cylinder with the frame. Install the sealing ring on the top cone and then pass it through the frame hole. Connect the upper and lower contacts of the sensor to the inner holes of the lifting sleeve and the adjustment sleeve. Release the jack. Fix the frame and the positioning seat by welding. Position the weighing mechanism and fix it to the frame according to the above method. Step 3: Adjust the horizontal accuracy of the scale panel, as follows: (1) Connect the hydraulic cylinder and the oil pipe, place the level ruler on the long and short sides of the scale panel, start the system to measure the levelness of the scale panel when it rises or falls, and ensure that the levelness error is between -0.1 and 0.2 mm. Do not remove the level ruler; (2) Observe and record the analog parameters of the sensor when the weighing instrument rises and loads, find out the maximum and minimum difference between the analog parameters of the weighing mechanism, which should be within 500-50, and use the level ruler to prove that the adjustment pads need to be added to the bottom support point, release the pressure of the hydraulic system, loosen the fastening bolts of the hydraulic cylinder, insert the adjustment pads into the bottom, tighten the bolts, and then start the hydraulic system. The hydraulic cylinder rises, observe the analog parameters and the level ruler, and determine whether this support point meets the requirements. Repeat this process until it meets the above accuracy requirements, and then adjust other weighing mechanisms according to this method; (3) After the scale panel is adjusted, lift the scale panel, unscrew the bolts one by one and take out the pad, then rotate the bolts to connect the lugs to the scale panel and tighten them. The hydraulic cylinder descends and the scale panel is pressed firmly on the dovetail groove of the positioning seat. Use a feeler gauge to measure the contact gap between the dovetail groove and the circular shaft, which is required to be 0-0.03mm.

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