Reverse automatic calibration device for matrix belt scale

Abstract

The present application relates to a kind of matrix belt scale reverse automatic calibration device, the calibration device includes positioning bolt, bolt, nut, upper cover, lower cover, electric push rod, top cone, internal hex bolt, adjusting bolt, positioning support, connecting rod and T-shaped bolt, the upper cover, lower cover are fixedly connected by bolt nut, the positioning bolt is screwed into the upper cover threaded hole, the electric push rod is fixed in the lower cover plane by bolt, the top cone is fixed on the electric push rod by internal hex bolt, the adjusting bolt is screwed into the positioning support upper plane threaded hole, connecting rod is connected in pairs by welding four T-shaped bolts, and the welded T-shaped bolt is from the inboard of positioning support slot The effect of automatic calibration is realized using the principle of electric push rod up and down.

Description

Technical Field

[0001] This invention relates to a calibration device, specifically a matrix belt scale reverse automatic calibration device, belonging to the technical field of calibration structure components. Background Technology

[0002] Belt conveyors are the most commonly used material handling equipment in production units today, but they all require weighing and measuring of materials, which is where matrix belt scales come in.

[0003] Matrix belt scales are dynamic weighing instruments. Calibration involves manually moving the circular weights to achieve the required calibration. Due to variations in transported materials or production targets, belt scales require frequent calibration, leading to increased downtime, significant manpower and resource investment, and resulting in production losses. Therefore, a new solution is urgently needed to address these technical problems. Summary of the Invention

[0004] This invention addresses the problems existing in the prior art by providing a matrix-type belt scale reverse automatic calibration device. This technical solution has a simple structure, reliable connection, convenient installation, increases calibration frequency, and ensures weighing accuracy.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: a matrix belt scale reverse automatic calibration device, characterized in that the calibration device includes a positioning bolt, a bolt, a nut, an upper cover, a lower cover, an electric push rod, a top cone, an internal hex bolt, an adjusting bolt, a positioning bracket, a connecting rod, and T-bolts. The upper cover and the lower cover are fixedly connected by bolts and nuts. The positioning bolt is screwed into the threaded hole of the upper cover. The electric push rod is fixed to the plane of the lower cover by bolts. The top cone is fixed to the electric push rod by internal hex bolts. The adjusting bolt is screwed into the threaded hole on the upper plane of the positioning bracket. The connecting rod connects four T-bolts in pairs by welding. The welded T-bolts pass through the inside of the slot of the positioning bracket.

[0006] As an improvement of the present invention, the positioning bracket is provided with an inner conical hole, and the top cone cooperates with the inner conical hole of the positioning bracket.

[0007] As an improvement to the present invention, the installation process of the calibration device is as follows:

[0008] Step 1: Secure the upper and lower covers together with bolts and nuts;

[0009] Step 2: Screw the positioning bolts into the threaded holes of the top cover;

[0010] Step 3: Secure the electric actuator to the lower cover surface with bolts;

[0011] Step 4: Secure the top cone to the electric push rod piston rod using hex socket head cap screws;

[0012] Step 5: Screw the adjusting bolt into the threaded hole on the upper surface of the positioning bracket;

[0013] Step 6: Connect the four T-bolts in pairs by welding. The welded T-bolts pass through the inside of the positioning bracket slot and then the nuts are tightened.

[0014] Step 7: The top cone mates with the inner cone hole of the positioning bracket. The matrix belt scale reverse automatic calibration device is now assembled.

[0015] As an improvement of the present invention, in step 6, the connecting rod should be firmly welded to the side of the T-bolt to prevent rotation during tightening, tilting of the force-bearing surface, and loss of clamping force.

[0016] As an improvement to the present invention, the calibration process is as follows:

[0017] Step 1: Secure the two top cones to the two electric push rod piston rods using hex socket head cap screws.

[0018] Step 2: Secure the two electric actuators to the flat surfaces of the two lower covers (with the piston rods of the electric actuators in their initial positions).

[0019] Step 3: Pair the upper and lower covers and install them on the outer surface of the hanger using a bolt and nut connection that allows them to move.

[0020] Step 4: Secure the two positioning brackets onto the two metering steel frames and determine the installation position, ensuring that the two inner conical holes are on the same straight line;

[0021] Step 5: Weld the connecting rod to the heads of the two T-bolts, ensuring that the length can pass through the side through hole of the positioning bracket. The force-bearing surface of the T-bolt should be vertically upward, and the T-bolt should protrude from the inside of the positioning bracket. Tighten the nuts by hand to slightly position the two positioning brackets; (ensure that the centers of the conical holes inside the two positioning brackets are on the same straight line).

[0022] Step 6: Place the spirit level on the inner conical hole plane of the positioning bracket, loosen the T-bolt on the lower side, use the adjusting bolt to lift the lower side of the positioning bracket until the spirit level is in the middle, then tighten the T-bolt, and then tighten all the adjusting bolts.

[0023] Step 7: Two people lift the hanging weight, move the upper and lower covers so that the top cone is aligned with the inner cone hole of the positioning bracket and makes full contact. Tighten the bolts and nuts of the upper and lower covers and tighten the positioning bolts. At this time, the hanging weight and the reverse automatic calibration device are pressed firmly on the inner cone holes of the two positioning brackets. The two people continue to hold the two ends of the hanging weight.

[0024] Step 8: Place the two weight brackets onto the outer surface of the steel frame of the scale body on both sides, so that the bottom plane of the notch of the weight bracket contacts the outer circle of the weight. Use a marker to draw straight lines on the outer surface of the steel frame of the scale body to mark the installation positions of the two weight brackets. Then, two people lower the weight.

[0025] Step 9: Weld the two weight brackets to the marked positions on the outside of the steel frame of the scale body, then drill through holes and tighten the bolts and nuts;

[0026] Step 10: The two people lift the hanging weight so that both ends of the hanging weight are pressed firmly on the bottom plane of the groove of the two hanging weight brackets, and at the same time the two top cones also contact the surface of the cone holes inside the two positioning brackets. The two people then release their hands.

[0027] Step 11: Place a spirit level in the middle of the weights and measure the horizontal error of the weights. Place a feeler gauge on the lower side of the weight and at the concave plane of the weight bracket until the spirit level is parallel. Determine the feeler gauge reading.

[0028] Step 12: Place the channel steel adjusting shim on the bottom plane of the lowest point hanging bracket, or machine a sleeve ring to fit onto the outer surface of the hanging bracket. The horizontality of the hanging bracket is now adjusted.

[0029] Step 13: At this point, the top cone and the inner cone hole of the positioning bracket are in complete contact or the gap is too small and there is a load. Two people lift the two ends of the hanging weight and place two 10mm channel steel adjustment pads on the bottom plane of the hanging weight bracket respectively (the original channel steel adjustment pads do not move), so that there is a large gap between the top cone and the inner cone hole of the positioning bracket, and the metering steel frame is not under force and has no load.

[0030] Step 14: Connect the power supply to extend the piston rods of the two electric push rods. The top cone contacts the inner cone of the positioning bracket, the weight rises, the measuring steel frame is stressed, and the load cell is loaded. Finally, install the two ends of the zipper dust cover on the outer circular surface of the top cone and the positioning bracket. The piston rods of the electric push rods retract and reset, the weight descends and presses the two ends firmly onto the bottom plane of the groove of the two weight brackets. The gap between the top cone and the inner cone hole of the positioning bracket is restored, the measuring steel frame is not stressed, and the load cell is unloaded.

[0031] Step 15: The above steps are the method and adjustment process for installing an automatic calibration device on a matrix belt scale. Follow this plan to complete the installation and adjustment of other automatic calibration devices.

[0032] Step 16: All electric push rods retract to their positions, start the belt operation, adjust the zero point of the belt scale, and during calibration, all electric push rod piston rods rise to their limit positions, the top cone is in contact with the inner cone hole of the positioning bracket and is subjected to force, the hanging weight rises and there is a gap between it and the hanging weight bracket, the measuring steel frame is subjected to vertical force, and the weighing sensor transmits the weight of the hanging weight and calibration begins.

[0033] Step 17: After calibration, the electric push rod retracts to its final position, the top cone separates from the inner cone hole surface of the positioning bracket with a gap, the hanging weight descends, and both ends contact and support the bottom plane of the hanging weight bracket. The load cell loses weight, and the weighing instrument value of the belt scale returns to zero.

[0034] As an improvement to this invention, in the above steps, the maximum and minimum limit dimensions of the electric push rod are determined to meet the requirements of the limited space and not affect the normal operation of other equipment. The piston rod of the electric push rod extends 20mm beyond the limit dimension; a shorter length ensures stable lifting and resistance to deformation, and the maximum load should be 2.5 to 3 times the weight of the load.

[0035] As an improvement of the present invention, the positioning bracket is installed on two metering steel frames. It is necessary to ensure that the two inner conical holes are on the same straight line to prevent the electric push rod piston rod from bending under force when it is lifted, reducing its service life, and causing the weight to tilt before and after hanging.

[0036] As an improvement of the present invention, in the above steps, the positioning bracket is installed on the two metering steel frames. It is necessary to ensure that the two inner conical holes are on the same straight line to prevent the electric push rod piston rod from bending under force when it is lifted, reducing its service life, and causing the weight to tilt before and after hanging.

[0037] Compared with existing technologies, this invention has the following advantages: 1) The upper and lower covers of this technical solution are tightened to meet the shape requirements of the hanging weight, are suitable for on-site installation and are secure, simple to process, and low in cost; 2) This solution applies civilian electric push rods (24V) to industry, not only achieving automation but also saving investment costs and reducing labor input; 3) The conical fit of this solution ensures centering accuracy, stabilizes the lifting center, and avoids deviation caused by belt scale vibration; 4) The positioning bracket is installed on the metering steel frame, which does not affect the sensor weighing, and meets the requirements of simple structure and low manufacturing cost. The principle of convenient maintenance is followed: 5) The positioning bracket and the upper and lower covers form a cross, allowing for quick, reliable, and accurate centering through spatial movement; 6) This solution uses T-bolts to fix and clamp the metering steel frame, eliminating the need for drilling holes in the metering steel frame and reducing its strength; 7) The T-bolts are welded with connecting rods to avoid rotation during tightening, reduce the clamping area, and prevent metal damage to the belt after loosening; 8) This solution increases the installation height of the hanging bracket, ensuring that the unloaded metering steel frame is unloaded, meeting the design requirements for automatic calibration. During calibration, both ends of the hanging bracket are in the groove, giving the hanging bracket a fixed upward and downward movement trajectory. Bolt tightening is safe and reliable, and on-site welding of the surface avoids damage to the belt; 9) This solution uses measuring instruments to adjust the levelness with accurate values, is simple to operate, and the adjustment shims are added safely and securely; 10) Adjusting the bolts adjusts the plane angle of the positioning bracket, providing angle compensation for belt conveyors with large non-horizontal angles, and generating a reaction force with the T-bolts, making the positioning bracket more stable. 11) This automatic calibration device has a simple structure, is easy to operate, and has low investment costs. It avoids the need to open the outer casing of the belt scale and carry out the operation procedures of lifting and hanging weights. It achieves the effect of automatic calibration by using the principle of electric push rod to move up and down. Attached Figure Description

[0038] Figure 1 This is a structural diagram of a matrix belt scale;

[0039] Figure 2 Partial diagram of the reverse automatic calibration device for a matrix belt scale;

[0040] Figure 3 This is an offline assembly diagram of the reverse automatic calibration device for a matrix belt scale.

[0041] Figure 4 This is a schematic diagram of a reverse automatic calibration device installed on a matrix belt scale.

[0042] Figure 5 A schematic diagram illustrating the operator lifting and hanging weights during the calibration of a matrix belt scale.

[0043] In the diagram: 1—Positioning bolt, 2—Bolt, 3—Nut, 4—Upper cover, 5—Lower cover, 6—Electric push rod, 7—Top cone, 8—Hex socket head cap screw, 9—Adjusting bolt, 10—Positioning bracket, 11—Connecting rod, 12—T-bolt, 13—Hanging bracket, 14—Dust cover, 15—Level, 16—Hanging bracket, 17—Weighing body steel frame, 18—Measuring steel frame, 19—Feeler gauge, 20—Channel steel adjusting shim. Detailed implementation method:

[0044] To enhance understanding of the present invention, the embodiments will be described in detail below with reference to the accompanying drawings.

[0045] Example 1: See Figures 1-5 An automatic reverse calibration device for a matrix belt scale is disclosed. The calibration device includes a positioning bolt 1, a bolt 2, a nut 3, an upper cover 4, a lower cover 5, an electric push rod 6, a top cone 7, an internal hex bolt 8, an adjusting bolt 9, a positioning bracket 10, a connecting rod 11, and T-bolts 12. The upper cover 4 and the lower cover 5 are fixedly connected by bolts and nuts. The positioning bolt is screwed into the threaded hole of the upper cover. The electric push rod 6 is fixed to the plane of the lower cover by bolts. The top cone is fixed to the electric push rod by internal hex bolts. The adjusting bolt is screwed into the threaded hole on the upper plane of the positioning bracket. The connecting rod connects the four T-bolts in pairs by welding. The welded T-bolts pass through the inside of the slot of the positioning bracket. The positioning bracket is provided with an inner conical hole, and the top cone mates with the inner conical hole of the positioning bracket.

[0046] The installation process for this calibration device is as follows:

[0047] Step 1: Secure the upper and lower covers together with bolts and nuts;

[0048] Step 2: Screw the positioning bolts into the threaded holes of the top cover;

[0049] Step 3: Secure the electric actuator to the lower cover surface with bolts;

[0050] Step 4: Secure the top cone to the electric push rod piston rod using hex socket head cap screws;

[0051] Step 5: Screw the adjusting bolt into the threaded hole on the upper surface of the positioning bracket;

[0052] Step 6: Connect the four T-bolts in pairs by welding. The welded T-bolts pass through the inside of the positioning bracket slot and then the nuts are tightened.

[0053] Step 7: The top cone mates with the inner cone hole of the positioning bracket. The matrix belt scale reverse automatic calibration device is now assembled. In step 6, the connecting rod must be securely welded to the side of the T-bolt to prevent rotation during tightening, tilting of the force-bearing surface, and loss of clamping force.

[0054] Example 2: See Figures 2-5 A matrix-type belt scale reverse automatic calibration device, the calibration process of which is as follows:

[0055] Step 1: Secure the two top cones to the two electric push rod piston rods using hex socket head cap screws.

[0056] Step 2: Secure the two electric actuators to the flat surfaces of the two lower covers (with the piston rods of the electric actuators in their initial positions).

[0057] Step 3: Pair the upper and lower covers and install them on the outer surface of the hanger using a bolt and nut connection that allows them to move.

[0058] Step 4: Secure the two positioning brackets onto the two metering steel frames and determine the installation position, ensuring that the two inner conical holes are on the same straight line;

[0059] Step 5: Weld the connecting rod to the heads of the two T-bolts, ensuring that the length can pass through the side through hole of the positioning bracket. The force-bearing surface of the T-bolt should be vertically upward, and the T-bolt should protrude from the inside of the positioning bracket. Tighten the nuts by hand to slightly position the two positioning brackets; (ensure that the centers of the conical holes inside the two positioning brackets are on the same straight line).

[0060] Step 6: Place the spirit level on the inner conical hole plane of the positioning bracket, loosen the T-bolt on the lower side, use the adjusting bolt to lift the lower side of the positioning bracket until the spirit level is in the middle, then tighten the T-bolt, and then tighten all the adjusting bolts.

[0061] Step 7: Two people lift the hanging weight, move the upper and lower covers so that the top cone is aligned with the inner cone hole of the positioning bracket and makes full contact. Tighten the bolts and nuts of the upper and lower covers and tighten the positioning bolts. At this time, the hanging weight and the reverse automatic calibration device are pressed firmly on the inner cone holes of the two positioning brackets. The two people continue to hold the two ends of the hanging weight.

[0062] Step 8: Place the two weight brackets onto the outer surface of the steel frame of the scale body on both sides, so that the bottom plane of the notch of the weight bracket contacts the outer circle of the weight. Use a marker to draw straight lines on the outer surface of the steel frame of the scale body to mark the installation positions of the two weight brackets. Then, two people lower the weight.

[0063] Step 9: Weld the two weight brackets to the marked positions on the outside of the steel frame of the scale body, then drill through holes and tighten the bolts and nuts;

[0064] Step 10: The two people lift the hanging weight so that both ends of the hanging weight are pressed firmly on the bottom plane of the groove of the two hanging weight brackets, and at the same time the two top cones also contact the surface of the cone holes inside the two positioning brackets. The two people then release their hands.

[0065] Step 11: Place a spirit level in the middle of the weights and measure the horizontal error of the weights. Place a feeler gauge on the lower side of the weight and at the concave plane of the weight bracket until the spirit level is parallel. Determine the feeler gauge reading.

[0066] Step 12: Place the channel steel adjusting shim on the bottom plane of the lowest point hanging bracket, or machine a sleeve ring to fit onto the outer surface of the hanging bracket. The horizontality of the hanging bracket is now adjusted.

[0067] Step 13: At this point, the top cone and the inner cone hole of the positioning bracket are in complete contact or the gap is too small and there is a load. Two people lift the two ends of the hanging weight and place two 10mm channel steel adjustment pads on the bottom plane of the hanging weight bracket respectively (the original channel steel adjustment pads do not move), so that there is a large gap between the top cone and the inner cone hole of the positioning bracket, and the metering steel frame is not under force and has no load.

[0068] Step 14: Connect the power supply to extend the piston rods of the two electric push rods. The top cone contacts the inner cone of the positioning bracket, the weight rises, the measuring steel frame is stressed, and the load cell is loaded. Finally, install the two ends of the zipper dust cover on the outer circular surface of the top cone and the positioning bracket. The piston rods of the electric push rods retract and reset, the weight descends and presses the two ends firmly onto the bottom plane of the groove of the two weight brackets. The gap between the top cone and the inner cone hole of the positioning bracket is restored, the measuring steel frame is not stressed, and the load cell is unloaded.

[0069] Step 15: The above steps are the method and adjustment process for installing an automatic calibration device on a matrix belt scale. Follow this plan to complete the installation and adjustment of other automatic calibration devices.

[0070] Step 16: All electric push rods retract to their positions, start the belt operation, adjust the zero point of the belt scale, and during calibration, all electric push rod piston rods rise to their limit positions, the top cone is in contact with the inner cone hole of the positioning bracket and is subjected to force, the hanging weight rises and there is a gap between it and the hanging weight bracket, the measuring steel frame is subjected to vertical force, and the weighing sensor transmits the weight of the hanging weight and calibration begins.

[0071] Step 17: After calibration, the electric push rod retracts to its final position, the top cone separates from the inner cone hole surface of the positioning bracket with a gap, the hanging weight descends, and both ends contact and support the bottom plane of the hanging weight bracket. The load cell loses weight, and the weighing instrument value of the belt scale returns to zero.

[0072] In the above steps, the maximum and minimum limit dimensions of the electric actuator must be determined to meet the requirements of the limited space and not affect the normal operation of other equipment. The piston rod of the electric actuator should extend 20mm beyond its limit dimension. A shorter length ensures stable lifting and resistance to deformation. The maximum load should be 2.5-3 times the weight of the load. The positioning bracket is installed on the two metering steel frames, ensuring that the two inner conical holes are aligned to prevent the piston rod of the electric actuator from bending under stress during lifting, which would reduce its lifespan and cause the load to tilt forward or backward.

[0073] In this design, the top cone and the inner conical hole of the positioning bracket are fully engaged under force during initial installation. This ensures the correct installation height of the two positioning brackets, serving as the reference point for the weights during no-load and calibration. Precise installation is crucial to avoid excessive adjustments in the weight level. The positioning bolts must be tightened securely; they are key fasteners ensuring the parallel positioning of the two electric push rods on the same plane and must be fitted with anti-loosening nuts. The connecting rod must be firmly welded to the side of the T-bolt to prevent rotation during tightening, tilting of the force-bearing surface, and loss of clamping force. The adjusting bolts are essential for ensuring the levelness of the two positioning brackets and eliminating height differences between the electric push rods. The height of the two weight brackets determines the levelness of the weights and is also crucial for the no-load condition where the top cone and the inner conical hole of the positioning bracket have a gap, resulting in no force on the load cell. During calibration, the top cone and the inner conical hole of the positioning bracket are in force-bearing contact, causing the weights to rise and the load cell to bear a load—this is the ultimate goal. During power-on testing, ensure that each set of electric push rods moves synchronously up and down, maintaining a 5-10mm distance between the hanging weight and the hanging weight bracket when they rise. After the electric push rod piston rod retracts, ensure that the top cone is within the conical hole of the positioning bracket, with a 5-10mm distance between the two points. Dust covers must be installed to prevent loose material from falling into the gap between the top cone and the conical hole of the positioning bracket, causing jamming and inaccurate measurement, and to prevent the electric push rod piston rod from getting stuck. Strictly use a spirit level and feeler gauge to adjust the levelness of the two positioning brackets and the hanging weight.

[0074] Belt scales, as crucial weighing instruments for belt conveyors, are widely used across various industries and have explicit calibration requirements. The weighing accuracy of belt scales directly impacts a company's material cost accounting, leading to frequent production stoppages for calibration in large and medium-sized enterprises. Calibration requires significant time and manpower investment; therefore, minimizing calibration time and investment while maintaining the required frequency has become a challenge for our organization. Each belt scale has eight hanging weights. Since implementing a reverse automatic calibration device on our matrix belt scales—a technology refined through long-term practice and continuous improvement—the experimental phase has demonstrated its effectiveness, validating the reverse automatic calibration device and achieving significant results in belt scale calibration operations. This enables remote control calibration, ensuring weighing accuracy and ultimately increasing production and efficiency.

[0075] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention. Equivalent transformations or substitutions made based on the above technical solutions all fall within the scope of protection of the claims of the present invention.

Claims

1. A calibration method for a matrix-type belt scale reverse automatic calibration device, characterized in that, The calibration device includes a positioning bolt, a bolt, a nut, an upper cover, a lower cover, an electric push rod, a top cone, an internal hex bolt, an adjusting bolt, a positioning bracket, a connecting rod, and T-bolts. The upper cover and the lower cover are fixedly connected by bolts and nuts. The positioning bolt is screwed into the threaded hole of the upper cover. The electric push rod is fixed to the plane of the lower cover with bolts. The top cone is fixed to the electric push rod with internal hex bolts. The adjusting bolt is screwed into the threaded hole on the upper plane of the positioning bracket. The connecting rod connects four T-bolts in pairs by welding. The welded T-bolts pass through the inside of the slot of the positioning bracket. The positioning bracket is provided with an inner conical hole, and the top cone cooperates with the inner conical hole of the positioning bracket. The installation process for this calibration device is as follows: Step 1: Secure the upper and lower covers together with bolts and nuts; Step 2: Screw the positioning bolts into the threaded holes of the top cover; Step 3: Secure the electric actuator to the lower cover surface with bolts; Step 4: Secure the top cone to the electric push rod piston rod using hex socket head cap screws; Step 5: Screw the adjusting bolt into the threaded hole on the upper surface of the positioning bracket; Step 6: Connect the four T-bolts in pairs by welding. The welded T-bolts pass through the inside of the positioning bracket slot and then the nuts are tightened. Step 7: The top cone engages with the inner cone hole of the positioning bracket. At this point, the matrix belt scale reverse automatic calibration device is assembled. In step 6, the connecting rod must be securely welded to the side of the T-bolt; The calibration process is as follows: Step 1: Secure the two top cones to the two electric push rod piston rods using hex socket head cap screws. Step 2: Secure the two electric actuators to the flat surfaces of the two lower covers. Step 3: Pair the upper and lower covers and install them on the outer surface of the hanger using a bolt and nut connection that allows them to move. Step 4: Secure the two positioning brackets onto the two metering steel frames and determine the installation position, ensuring that the two inner conical holes are on the same straight line; Step 5: Weld the connecting rod to the heads of the two T-bolts, ensuring that the length can be inserted into the through hole on the side of the positioning bracket. The force-bearing surface of the T-bolt should be vertically upward, and the T-bolt should be inserted from the inside of the positioning bracket. Tighten the nut to slightly position the two positioning brackets. Step 6: Place the spirit level on the inner conical hole plane of the positioning bracket, loosen the T-bolts on the bottom edge, use the adjusting bolts to lift the bottom edge of the positioning bracket until the spirit level is in the middle, then tighten the T-bolts, and then tighten all the adjusting bolts. Step 7: Two people lift the hanging weight, move the upper and lower covers so that the top cone is aligned with the inner cone hole of the positioning bracket and makes full contact. Tighten the bolts and nuts of the upper and lower covers and tighten the positioning bolts. At this time, the hanging weight and the reverse automatic calibration device are pressed firmly on the inner cone holes of the two positioning brackets. The two people continue to hold the two ends of the hanging weight. Step 8: Place the two weight brackets onto the outer surface of the steel frame of the scale body on both sides, so that the bottom plane of the notch of the weight bracket contacts the outer circle of the weight. Use a marker to draw straight lines on the outer surface of the steel frame of the scale body to mark the installation positions of the two weight brackets. Then, two people lower the weight. Step 9: Weld the two weight brackets to the marked positions on the outside of the steel frame of the scale body, then drill through holes and tighten the bolts and nuts; Step 10: The two people lift the hanging weight so that both ends of the hanging weight are pressed firmly on the bottom plane of the groove of the two hanging weight brackets, and at the same time the two top cones also contact the surface of the cone holes inside the two positioning brackets. The two people then release their hands. Step 11: Place a spirit level in the middle of the weights and measure the horizontal error of the weights. Place a feeler gauge on the lower side of the weight and at the concave plane of the weight bracket until the spirit level is parallel. Determine the feeler gauge reading. Step 12: Place the channel steel adjusting shim on the bottom plane of the lowest point hanging bracket, or machine a sleeve ring to fit onto the outer surface of the hanging bracket. The horizontality of the hanging bracket is now adjusted. Step 13: At this time, the top cone and the inner cone hole of the positioning bracket are in complete contact or the gap is too small and there is a load. Two people lift the two ends of the hanging weight and place two 10mm channel steel adjustment pads on the bottom plane of the hanging weight bracket respectively, so that the top cone and the inner cone hole of the positioning bracket have a large gap, and the metering steel frame is not under force and has no load. Step 14: Connect the power supply to extend the piston rods of the two electric push rods. The top cone contacts the inner cone of the positioning bracket, the weight rises, the measuring steel frame is stressed, and the load cell is loaded. Finally, install the two ends of the zipper dust cover on the outer circular surface of the top cone and the positioning bracket. The piston rods of the electric push rods retract and reset, the weight descends and presses the two ends firmly onto the bottom plane of the groove of the two weight brackets. The gap between the top cone and the inner cone hole of the positioning bracket is restored, the measuring steel frame is not stressed, and the load cell is unloaded. Step 15: The above steps are the method and adjustment process for installing an automatic calibration device on a matrix belt scale. Follow this plan to install and adjust the other automatic calibration devices. Step 16: All electric push rods retract to their positions, start the belt operation, adjust the zero point of the belt scale, and during calibration, all electric push rod piston rods rise to their limit positions, the top cone is in contact with the inner cone hole of the positioning bracket and is subjected to force, the hanging weight rises and has a gap with the hanging weight bracket, the measuring steel frame is subjected to vertical force, the weighing sensor transmits the weight of the hanging weight, and calibration begins. Step 17: After calibration, the electric push rod retracts to its final position, the top cone separates from the inner cone hole surface of the positioning bracket with a gap, the weight descends, and both ends contact and support the bottom plane of the weight bracket. The load cell loses weight, and the weighing instrument value of the belt scale returns to zero.

2. The calibration method for the matrix belt scale reverse automatic calibration device according to claim 1, characterized in that, In the above steps, the maximum and minimum limit dimensions of the electric actuator are determined. The limit dimension of the electric actuator piston rod extension is 20mm, and the maximum load should be 2.5 to 3 times the weight of the load.

3. The calibration method for the matrix belt scale reverse automatic calibration device according to claim 2, characterized in that, The positioning bracket is installed on the two measuring steel frames. It is necessary to ensure that the two inner conical holes are on the same straight line to prevent the electric push rod piston rod from bending under force when it is lifted, which would reduce its service life and cause the weight to tilt back and forth.

4. The calibration method for the matrix belt scale reverse automatic calibration device according to claim 3, characterized in that, In the above steps, the positioning bracket is installed on the two measuring steel frames to ensure that the two inner conical holes are on the same straight line.

Images