Modular scale platform dual force transmission fulcrum assembly and method of installation

Abstract

The application discloses a modular scale frame double transmission force fulcrum assembly and a mounting method thereof, which comprises a rhombic base, a first positioning hole, a first bolt, two second positioning holes, a second bolt, a bearing seat, a joint bearing, a limiting sleeve, a positioning shaft, a fourth positioning hole, a rope and a fifth positioning hole.

Description

Modular Weighing Frame Dual Force Transmission Support Component and its Installation Method Technical Field

[0001] This invention relates to electronic belt scale equipment, and more particularly to the force transmission component between the fixed frame and the movable frame of a modular scale frame and its installation method. Background Technology

[0002] The weighing frame is the foundation of high precision in electronic belt scales. It consists of two parts: a fixed frame and a movable frame, and serves as the force transmission device. The weight of the material on the belt conveyor is applied to the weighing idler rollers via the belt. The force acting on the weighing idler rollers is transmitted to the weighing sensor on the fixed frame through the movable frame, thus outputting a load electrical signal. This load electrical signal, along with the speed signal from the speed sensor, is accumulated and output by an accumulator. The weighing idler rollers on the movable frame must withstand not only the downward pressure of the material but also the frictional force generated by the belt movement. To prevent displacement of the movable frame due to belt friction, it must be limited. Traditionally, there are two main limiting methods: one is to use components such as springs, tie rods, or hinges between the fixed and movable frames for limiting; the other is to use multiple sensors connected between the movable and fixed frames for limiting. Regardless of the method used, the weight of the material acts on the movable frame through the belt and weighing idler rollers. The movable frame transmits the force to the weighing sensor through the force transmission components. In this process, the movable frame effectively transmits the vertical load to the sensor. For belt scales with dual sensors, averaging measurements from two points reduces local errors caused by uneven material distribution, belt vibration, or tension fluctuations, resulting in higher accuracy. Ideally, the two sensors should share the weight equally. However, if the force transmission fulcrum (such as a spherical bearing) is not perfectly aligned, or if the scale frame has slight deformation, uneven force distribution will occur. In this case, the signals output by the two sensors will be inconsistent. Since the integrator (instrument) typically only adds the two signals, this sum cannot accurately reflect the total weight, thus generating off-center loading errors. Further complicating matters, in a dual-lever system, the two sensors and the force transmission mechanism are mechanically coupled. Friction or jamming at one fulcrum not only affects the output of that sensor but also influences the force on the other sensor through the scale frame structure, creating error coupling. Dual-sensor systems have extremely stringent requirements for installation accuracy. For example, regulations require that the load-bearing points of the two sensors be on the same horizontal plane, and their connection line must be parallel to the roller axis. Any minute installation deviation will be amplified during system operation. At the same time, the maintenance workload is also greater, requiring regular checks to ensure that the rotation or swing of the two fulcrums is flexible and free, and to ensure the smoothness of the entire force transmission path.

[0003] For example, Chinese Utility Model Patent Publication No. CN206177446U discloses a high-degree-of-freedom electronic belt scale frame, including a fixed frame, a movable frame, load cells, a conveyor belt, and metering rollers. A trunnion is fixedly connected to the movable frame, and the load cells are rotatably connected to the trunnion via force transmission pins and spherical bearings. The load cells are horizontally distributed and fixed to the fixed frame with screws. In this patent, the movable frame transmits force to the load cells through the trunnions, force transmission pins, and spherical bearings. The two trunnions, two force transmission pins, and two spherical bearings on the movable frame are installed independently, making installation cumbersome, unable to guarantee perfect alignment of the force transmission points, resulting in low installation accuracy and large installation deviations.

[0004] For example, Chinese utility model patent publication number CN209689733U discloses a high-stability electronic belt scale frame, including a movable frame, a fixed frame, and a sensor. A force-transmitting trunnion is fixedly connected to the movable frame. The force-transmitting trunnion has a radial square hole in its middle and a through hole communicating with the radial square hole at its top. The free end of the sensor extends into the radial square hole, and a force-transmitting rod is fixedly connected to this free end. The bottom of the sensor is connected to the fixed frame via a connecting plate. The two sides of the force-transmitting trunnion are rotatably connected to the connecting plate via symmetrically distributed tie rods, with an included angle between the tie rods and the force-transmitting trunnion. In this patent, the two force-transmitting trunnions, two force-transmitting rods, two tie rods, and two connecting plates are also installed independently, making installation cumbersome, unable to guarantee perfect alignment of the force-transmitting fulcrum, resulting in low installation accuracy and large installation deviations. Summary of the Invention

[0005] The technical problem to be solved by this invention is that the force transmission fulcrum of the existing belt scale with dual sensors cannot be perfectly aligned during installation, resulting in low installation accuracy and large installation deviation. To address this, a modular scale frame dual force transmission fulcrum assembly and its installation method are provided.

[0006] The technical solution of this invention is: a modular weighing frame dual force transmission fulcrum assembly, comprising: a rhomboid base; a first positioning hole, the first positioning hole being formed at one end of the long axis of the rhomboid base; a first bolt, the first bolt being adapted to fit within the first positioning hole; two second positioning holes, the two second positioning holes being formed at both ends of the short axis of the rhomboid base; a second bolt, the second bolt being adapted to fit within the second positioning hole; a bearing seat, the outer circumferential surface of the bearing seat having an extension portion, the end of the extension portion having an arc-shaped bayonet, the arc-shaped bayonet having two third positioning holes corresponding vertically to the second positioning holes, the second positioning holes and the third positioning holes being connected by second bolts; A spherical bearing, which is fitted inside a bearing housing; a limiting sleeve, which is detachably connected to the bottom of the bearing housing and concentric with the center of the spherical bearing, the inner diameter of the limiting sleeve being smaller than the inner diameter of the bearing housing; a positioning shaft, which includes a small-diameter section, a large-diameter section, and a base, the small-diameter section having a clearance fit with the spherical bearing, the large-diameter section fitting with the limiting sleeve, and a center point at the bottom center of the base; a fourth positioning hole, which is located at the other end of the long axis of the rhomboid base; a rope, one end of which passes through the fourth positioning hole; and a fifth positioning hole, which is located on the straight line formed by the first positioning hole and the fourth positioning hole.

[0007] An improvement to the above scheme is that a groove is provided at the end of the small-diameter section for the rope to pass through.

[0008] In the above scheme, the limiting sleeve and the bearing seat are connected by several bolts.

[0009] The rope mentioned in the above scheme is a steel wire rope.

[0010] A further improvement to the above scheme is that an annular pressure cap is fixed to the top of the bearing housing, and several bearing bolts pass through the annular pressure cap and through the bearing housing to be threadedly connected to the limiting sleeve.

[0011] The installation method of the modular weighing frame dual force transmission support assembly includes the following steps: S1, two sensors on the belt scale are symmetrically distributed on a straight line parallel to the fixed frame. Through holes are provided on both sides of the fixed frame, and a cylinder is fitted into each through hole with a clearance fit. The bottom of the cylinder is fixedly connected to the movable frame. A window for the sensor to extend into is provided on the side of the cylinder, and a mounting hole is provided on the top of the cylinder; S2, the roller bracket is firmly welded to the movable frame. A rhomboid base is placed on the top of the cylinder so that the first positioning hole aligns with the mounting hole. The first bolt is tightened to install the rhomboid base on the top of the cylinder. The arc-shaped locking joint is aligned with the cylinder's... S1. With the surface tightly attached, insert a positioning shaft through the fifth positioning hole into a bearing seat, so that the large diameter section matches the limiting sleeve, the small diameter section has a clearance fit with the spherical bearing, and the tip contacts the surface of the fixing frame. Align the two second positioning holes with the two third positioning holes and install the second bolts. Repeat this operation for the other rhomboid base. S2. Connect the two ends of the rope to the fourth positioning holes of the two rhomboid bases and pull them tight. Tighten the second bolts of the two rhomboid bases. S3. Weld the arc-shaped bayonet of the two bearing seats to the corresponding cylinders respectively. Weld the bases of the two positioning shafts to the fixing frame. S4. Remove the second bolts and the limiting sleeve.

[0012] A further improvement to the above solution includes the following steps: using two pry bars to simultaneously pry the movable frame from both sides to raise it a certain distance and then lower it, repeating this several times. During this process, oil is dripped into the contact surface between the positioning shaft and the spherical bearing to ensure sufficient lubrication, and finally, the bearing housing is coated with grease.

[0013] The beneficial effect of this invention is that, for belt scales with dual sensors, the installation accuracy of the two positioning shafts is high, and the two positioning shafts are located on a straight line, which ensures the installation accuracy and consistency of the two force transmission fulcrums and avoids additional installation errors to the weighing of the dual sensors. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the modular weighing frame dual force transmission fulcrum assembly of the present invention;

[0015] Figure 2 is a top view of Figure 1;

[0016] Figure 3 is a schematic diagram of the two rhomboid bases and the rope of the present invention;

[0017] In the diagram, 1. Bearing housing, 2. Bearing bolt, 3. Annular gland, 4. Positioning shaft, 5. Spherical bearing, 6. Limiting sleeve, 7. Second bolt, 8. Rhomboid base, 9. First bolt, 10. Second positioning hole, 11. Extension, 12. Fourth positioning hole, 13. Rope, 14. Fifth positioning hole, 15. First positioning hole, 16. Sensor, 17. Fixed frame, 18. Cylinder, 19. Movable frame. Detailed Implementation

[0018] To facilitate understanding of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art are within the scope of protection of the present invention.

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] As an embodiment of the present invention, as shown in Figures 1-3, the modular weighing frame dual force transmission fulcrum assembly includes: a rhomboid base 8; a first positioning hole 15, which is opened at one end of the long axis of the rhomboid base 8; a first bolt 9, which is adapted to fit within the first positioning hole 15; two second positioning holes 10, which are opened at both ends of the short axis of the rhomboid base 8; a second bolt 7, which is adapted to fit within the second positioning holes 10; a bearing seat 1, the outer circumferential surface of which is provided with an extension portion 11, the end of which is provided with an arc-shaped notch, and the arc-shaped notch is provided with two third positioning holes corresponding vertically to the second positioning holes 10, the second positioning holes 10 and the third positioning holes being connected by the second bolts 7; a spherical bearing 5, which is adapted to fit inside the bearing seat 1; and a limiting sleeve 6, which is connected to the bottom of the bearing seat 1 by two bearing bolts 2 and is concentric with the center of the spherical bearing 5. The inner diameter of the sleeve 6 is smaller than the inner diameter of the bearing seat 1; the positioning shaft 4 includes a small diameter section, a large diameter section and a base, the small diameter section is clearance-fitted with the spherical bearing 5, the large diameter section is adapted to the limiting sleeve 6, and the base has a center point at the bottom center; the fourth positioning hole 12 is opened at the other end of the long shaft of the rhomboid base 8; the rope 13 is threaded through the fourth positioning hole 12 at one end, and the rope 13 can be made of metal such as steel wire rope, synthetic fiber such as nylon rope or natural fiber such as hemp rope; the fifth positioning hole 14 is opened on the straight line formed by the first positioning hole 15 and the fourth positioning hole 12, specifically, the fifth positioning hole 14 is located on the extension line of the straight line formed by the first positioning hole 15 and the fourth positioning hole 12, or the fifth positioning hole 14 is located within the straight line formed by the first positioning hole 15 and the fourth positioning hole 12, and the diameter of the fifth positioning hole 14 is large enough to allow the entire positioning shaft 4 to pass through and be placed above the fixing frame 17.

[0021] The above-mentioned modular weighing frame dual force transmission fulcrum assembly is suitable for belt scales with dual sensors 16. The installation method is as follows: S1. The two sensors 16 on the belt scale are symmetrically distributed on a straight line parallel to the fixed frame 17. The fixed frame 17 has through holes on both sides, and a cylinder 18 is fitted into the through holes with clearance. The bottom of the cylinder 18 is fixedly connected to the movable frame 19. The side of the cylinder 18 has a window for the sensor 16 to extend into, and the top of the cylinder 18 has a mounting hole; S2. The roller bracket is welded firmly to the movable frame 19. A rhomboid base 8 is placed on the top of the cylinder 18 so that the first positioning hole 15 is aligned with the mounting hole. The first bolt 9 is tightened so that the rhomboid base 8 is installed on the top of the cylinder 18. The rhomboid base 8 provides a horizontal reference surface, and the arc-shaped bayonet is aligned with the surface of the cylinder 18. S1. Insert a positioning shaft 4 into a bearing seat 1 through the fifth positioning hole 14, so that the large diameter section fits the limiting sleeve 6 and the small diameter section has a clearance fit with the spherical bearing 5. The tip contacts the surface of the fixing frame 17. The bearing seat 1 and the arc-shaped bayonet provide a vertical reference surface. Align the two second positioning holes 10 with the two third positioning holes and install the second bolts 7. Repeat this operation for the other rhomboid base 8. S2. Connect the two ends of the rope 13 to the fourth positioning holes 12 of the two rhomboid bases 8 and pull them tight. Tighten the second bolts 7 of the two rhomboid bases 8. S3. Weld the arc-shaped bayonet of the two bearing seats 1 to the corresponding cylinders 18 respectively. Weld the bases of the two positioning shafts 4 to the fixing frame 17. S4. Remove the second bolts 7 and the limiting sleeve 6. This completes the installation of the two force transmission fulcrum components.

[0022] As an embodiment of the above installation method, the following steps are also included: using two pry bars to pry the movable frame from both sides at the same time to raise it a certain distance and then lower it, repeating this several times. During this process, machine oil is dripped into the contact surface between the positioning shaft 4 and the spherical bearing 5 to make it fully lubricated, and finally, the bearing seat 1 is filled with grease.

[0023] As a preferred embodiment of the present invention, the end of the small diameter segment is provided with a groove for the rope 13 to pass through. At this time, the fourth positioning hole 12 is located between the first positioning hole 15 and the fifth positioning hole 14. The two fourth positioning holes 12 of the two force transmission fulcrum components and the two small diameter segments form four points on a straight line, ensuring perfect alignment of the two force transmission fulcrum components.

[0024] In one embodiment of the present invention, an annular pressure cap 3 is fixedly connected to the top of the bearing housing 1, and a plurality of bearing bolts 2 pass through the bearing housing 1 from above the annular pressure cap 3 and are threadedly connected to the limiting sleeve 6. The function of the annular pressure cap 3 is to press down on the outer ring of the bearing and fix the spherical plain bearing 5 inside the bearing housing 1.

[0025] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit and principles of the invention. The embodiments disclosed above are merely preferred embodiments of the present invention and are not intended to limit the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A modular weighing frame with dual force transmission fulcrum assembly, characterized by: include: A rhomboid base (8); a first positioning hole (15), which is located at one end of the long axis of the rhomboid base (8); a first bolt (9), which is fitted into the first positioning hole (15); two second positioning holes (10), which are located at both ends of the short axis of the rhomboid base (8); a second bolt (7), which is fitted into the second positioning hole (10); a bearing seat (1), the outer circumferential surface of which is provided with an extension portion (11). The extension (11) has an arc-shaped bayonet at its end, and two third positioning holes corresponding to the second positioning hole (10) are provided on the arc-shaped bayonet. The second positioning hole (10) and the third positioning hole are connected by a second bolt (7). A spherical bearing (5) is fitted inside the bearing seat (1). A limiting sleeve (6) is detachably connected to the bottom of the bearing seat (1) and is concentric with the center of the spherical bearing (5). The inner diameter of the limiting sleeve (6) is smaller than that of the bearing seat (1). 1) Inner diameter; positioning shaft (4), the positioning shaft (4) includes a small diameter section, a large diameter section and a base, the small diameter section is clearance-fitted with the spherical bearing (5), the large diameter section is adapted to the limiting sleeve (6), and the base has a center point at the bottom center; fourth positioning hole (12), the fourth positioning hole (12) is opened at the other end of the long shaft of the rhomboid base (8); rope (13), one end of the rope (13) is inserted into the fourth positioning hole (12); fifth positioning hole (14), the fifth positioning hole (14) is opened in The first positioning hole (15) and the fourth positioning hole (12) are connected on a straight line; two sensors (16) are symmetrically distributed on a straight line parallel to the fixing frame (17). The fixing frame (17) has through holes on both sides, and a cylinder (18) is fitted inside the through holes with clearance. The side of the cylinder (18) has a window for the sensor (16) to extend into, and the top of the cylinder (18) has a mounting hole. The rhomboid base (8) is placed on the top of the cylinder (18) so that the first positioning hole (15) is aligned with the mounting hole.

2. The modular weighing frame dual force transmission fulcrum assembly as described in claim 1, characterized in that: The end of the small-diameter section is provided with a groove for the rope (13) to pass through.

3. The modular weighing frame dual force transmission fulcrum assembly as described in claim 1, characterized in that: The limiting sleeve (6) is connected to the bearing seat (1) by a number of bearing bolts (2).

4. The modular weighing frame dual force transmission fulcrum assembly as described in claim 1, characterized in that: The rope (13) is a steel wire rope.

5. The modular weighing frame dual force transmission fulcrum assembly as described in claim 3, characterized in that: The bearing housing (1) is fixedly connected to the top of an annular cover (3), and several bearing bolts (2) are threaded through the bearing housing (1) from above the annular cover (3) and through the bearing housing (6).

6. The installation method of the modular weighing frame dual force transmission fulcrum assembly as described in claim 1, characterized in that: Includes the following steps: S1. Two sensors (16) on the belt scale are symmetrically distributed on a straight line parallel to the fixed frame (17). The fixed frame (17) has through holes on both sides, and a cylinder (18) is fitted into the through holes with clearance. The bottom of the cylinder (18) is fixed to the movable frame (19). The side of the cylinder (18) has a window for the sensor (16) to extend into, and the top of the cylinder (18) has a mounting hole. S2. The roller bracket is welded firmly to the movable frame (19). A rhomboid base (8) is placed on the top of the cylinder (18) so that the first positioning hole (15) is aligned with the mounting hole. The first bolt (9) is tightened so that the rhomboid base (8) is installed on the top of the cylinder (18). The arc-shaped bayonet is close to the surface of the cylinder (18). A positioning shaft (4) is placed on the top of the cylinder (18). S1) Insert a bearing seat (1) through the fifth positioning hole (14) so ​​that the large diameter section fits the limiting sleeve (6), the small diameter section fits the joint bearing (5) with clearance, and the tip contacts the surface of the fixing frame (17). Align the two second positioning holes (10) with the two third positioning holes and install the second bolt (7). Repeat this operation for the other rhomboid base (8). S2) Connect the two ends of the rope (13) to the fourth positioning holes (12) of the two rhomboid bases (8) and tighten them. Tighten the second bolt (7) of the two rhomboid bases (8). S3) Weld the arc-shaped bayonet of the two bearing seats (1) to the corresponding cylinder (18) respectively. Weld the base of the two positioning shafts (4) to the fixing frame (17). S4) Remove the second bolt (7) and the limiting sleeve (6).

7. The installation method of the modular weighing frame dual force transmission fulcrum assembly as described in claim 6, characterized in that: It also includes the following steps: Use two pry bars to pry the movable frame from both sides at the same time, raising it a certain distance and then lowering it. Repeat this several times. During this process, drip machine oil into the contact surface between the positioning shaft (4) and the spherical bearing (5) to lubricate it fully. Finally, coat the bearing seat (1) with grease.

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