Online calibration device for automatic weighing apparatus

Abstract

The invention discloses an on-line calibration device for an automatic weighing apparatus. The on-line calibration device comprises a frame, a walking mechanism arranged below the frame and driving the frame to move back and forth along the length direction of a weighbridge, and a guide mechanism adjustably arranged at the bottom of the outer side of the frame and in sliding contact with a sidebar of the weighbridge. A plurality of standard weights are stacked on the inner side of the frame, and a lifting rotating assembly, a transverse moving device installed at the top of the lifting rotating assembly, a vertical moving device arranged on the side edge of the transverse moving device, a clamping jaw installed at the bottom of the vertical moving device and an industrial camera are vertically arranged at the end corner of the inner side of the frame. The walking mechanism is arranged below the frame, the lifting rotating assembly and the transferring assembly are arranged above the frame, and the standard weights are stacked on the inner side of the frame, so that the frame can be controlled to move in the length direction of the wagon balance under the working condition of the walking mechanism and move to the corresponding position; and the lifting rotating assembly and the transferring assembly are matched to clamp and transfer the standard weights to the wagon balance.

Description

Technical Field

[0001] The invention relates to the technical field of floor scale calibration, in particular to an online calibration device for an automatic weighing instrument. Background Art

[0002] In modern industrial and commercial activities, scales, as large electronic weighing instruments, have become essential equipment for cargo measurement and production process monitoring due to their powerful weighing capacity and convenience. Whether measuring bulk materials in mines and ports, or managing the weighing of raw materials and finished products in industries like food and chemicals, the accuracy of scales directly determines production quality and efficiency, impacting both the company's economic performance and the fairness of industry transactions. Any deviation in scale measurement can lead to serious consequences, such as incorrect production ingredients and trade disputes. Therefore, regular calibration is essential to ensure the proper operation of scales.

[0003] Traditional automatic scale calibration methods typically require removing the scale from the production line and calibrating it using standard weights. This calibration method has significant drawbacks: First, the process of removing and reinstalling the scale involves complex mechanical operations and circuit debugging, which requires a lot of manpower and time. Frequent disassembly can easily cause wear and damage to scale components, reducing the lifespan of the equipment. Second, the production line must be suspended during the calibration process, resulting in interruptions to production activities and a significant impact on production schedules. Especially for companies with continuous production, the economic losses caused by downtime for calibration cannot be ignored.

[0004] Although some methods have emerged in the prior art that can complete calibration without disassembling automatic scales, there are still many challenges in the calibration practice of large scales such as floor scales. Due to the large area and complex structure of the floor scale table, multiple calibration points need to be selected during the calibration process, and corresponding standard weights need to be placed at each point, and the weights need to be continuously moved according to the calibration requirements. This not only greatly increases the labor intensity of the operator and reduces the calibration efficiency, but also during the weight handling process, any improper operation can easily cause the electronic weight scale to be subjected to severe impact, affecting the performance of its internal sensors and circuit systems, and even causing damage to the scale. In addition, there is a high safety risk in manually carrying heavy standard weights, which may cause injury to the operator and seriously threaten the personal safety of the operator. Summary of the Invention

[0005] The object of the present invention is to provide an online calibration device for an automatic weighing instrument, aiming to improve the problem of manually moving standard weights when disassembling a floor scale for calibration or calibrating a floor scale online.

[0006] The present invention is implemented as follows: an automatic weighing instrument online calibration device includes a frame, a walking mechanism arranged under the frame to drive the frame to move back and forth along the length direction of the scale, and an adjustable guide mechanism arranged at the bottom outside the frame and in sliding contact with the side rail of the scale; a plurality of standard weights are stacked on the inner side of the frame, and a lifting and rotating assembly, a transverse moving device installed on the top of the lifting and rotating assembly, a vertical moving device arranged on the side of the transverse moving device, a clamp installed at the bottom of the vertical moving device and an industrial camera are vertically arranged at the end corners of the inner side of the frame; the clamp clamps the top of the standard weight, and the lifting and rotating assembly, the transverse moving device and the vertical moving device control the clamp to move in space to transfer the standard weight to the scale.

[0007] Preferably, the transverse movement device includes a support frame, a lead screw arranged on the inner side of the support frame, and a moving block slidably arranged on the side of the support frame and threadedly sleeved on the lead screw, the end of the lead screw is connected to the power output shaft of the fourth motor, and the fourth motor is installed at the end of the support frame; guide rails and sliders are respectively provided on the side walls of the moving block and the support frame close to each other.

[0008] Preferably, the vertical moving device and the transverse moving device have the same structure, and the moving block of the vertical moving device is connected to the moving block of the transverse moving device by bolts, and the vertical moving device and the transverse moving device are in a perpendicular state to each other.

[0009] Preferably, the lifting and rotating assembly includes a chassis movably mounted on the frame, a bottom tube vertically mounted above the chassis, and a lifting tube whose bottom is lifted and inserted into the inner side of the bottom tube; the top of the lifting tube is connected by bolts and inserted into the sleeve frame at the bottom of the transverse moving device support frame, and the lifting tube drives the transverse moving device to rise and fall, while the chassis rotates to adjust the direction of the vertical moving device.

[0010] Preferably, a first motor is invertedly arranged above the chassis, and the ear plate at the bottom of the bottom tube is sleeved on the stud of the chassis, and the first motor is located on the inner side of the bottom tube; a threaded column is connected to the power output shaft of the first motor, and a threaded sleeve sleeved on the threaded column is installed at the bottom of the inner side of the lifting tube; the chassis is installed on the end shaft of the worm gear, and a worm is meshed with the side of the worm gear, and the worm gear and the worm are installed on the same frame; the frame is fixedly connected to the frame, and the power output shaft of the second motor arranged on the outside of the end of the frame is connected to the worm.

[0011] Preferably, two limiting arc plates are provided on the outer side of the chassis connected by bolts, and a first slide groove and a second slide groove are provided on the side walls adjacent to the limiting arc plates and the chassis respectively, and a plurality of balls are provided in the space formed by the first slide groove and the second slide groove; the legs of the two limiting arc plates on the side away from each other are fixedly connected to the frame.

[0012] Preferably, the two sets of walking mechanisms distributed front and back each include two walking wheels, and the central axes of the two walking wheels are connected and installed on the frame through a bearing seat; one set of the walking mechanisms is provided with a transmission shaft connected between the central axes of the two walking wheels, and a driven gear is sleeved on the transmission shaft, and a driving gear meshed with the side of the driven gear is installed on the power output shaft of the third motor.

[0013] Preferably, a brake plate is adjustably provided on the side of the driving gear or the driven gear, a structure that meshes with the gear is provided on the brake plate, and a snap groove with an open end is provided on the side of the brake plate away from the gear, and the snap groove is provided and fixedly mounted on the frame; the brake plate is installed at the telescopic end of the first telescopic cylinder, and the first telescopic cylinder is connected to the frame through a bracket.

[0014] Preferably, the guiding mechanism includes a connecting plate, a connecting pipe hingedly arranged at the bottom of the connecting plate and a second telescopic cylinder, the connecting pipe is detachably installed at the bottom of the frame, and the second telescopic cylinder is hingedly connected to the frame at one end away from the connecting plate; an arc-shaped plate is fixedly installed on the top of the connecting plate, and the second telescopic cylinder adjusts the arc-shaped plate to be set near the siderail of the scale.

[0015] Preferably, each standard weight is placed on a tray, and trays of the same group located on the same plane are fixedly connected, and end plates are fixedly provided on the edge of each group of trays; a limiting groove with an open end is provided on the inner side wall of the frame, and the end plates of multiple groups of trays distributed up and down are inserted into their respective limiting grooves; an annular groove is provided on the top of each standard weight, and the clamps clamp the annular groove of the standard weight or the tray to be raised or lowered.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention is provided with a walking mechanism at the bottom of the frame, and a lifting and rotating assembly and a transfer assembly are provided at the top of the frame. At the same time, a plurality of standard weights are stacked on the inner side of the frame. When the walking mechanism is working, the frame can be controlled to move along the length direction of the scale, and when it moves to the corresponding position, the lifting and rotating assembly and the transfer assembly cooperate to clamp and transfer the standard weights to the scale, thereby providing support for the regular calibration of the scale and changing the current situation of manual movement of weights.

[0017] 2. The guiding mechanism provided in the present invention includes a connecting plate with an adjustable tilt angle, and an arc-shaped plate is provided on the top of the connecting plate, which can make the connecting plate in an inclined or horizontal state when the telescopic cylinder is working. By controlling the arc-shaped plate to be close to or even fit the siderail setting of the scale, the position of the frame relative to the scale can be limited, and it can be guided to move in a predetermined direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a first structural schematic diagram of the present invention as a whole; Figure 2It is a second structural schematic diagram of the present invention as a whole; Figure 3 It is a structural diagram of the transfer assembly, lifting and rotating assembly, housing, walking mechanism, and guiding mechanism of the present invention; Figure 4 It is a structural diagram of the transfer assembly, lifting and rotating assembly, standard weight, walking mechanism, and guiding mechanism of the present invention; Figure 5 It is a structural diagram of the housing, the traveling mechanism and the guiding mechanism of the present invention; Figure 6 It is a structural schematic diagram of the housing and frame of the present invention; Figure 7 It is a structural diagram of the framework of the present invention; Figure 8 It is a structural schematic diagram of the walking mechanism of the present invention; Figure 9 It is a structural schematic diagram of the brake plate of the present invention; Figure 10 It is a structural schematic diagram of the guiding mechanism of the present invention; Figure 11 It is a structural schematic diagram of the standard weight of the present invention; Figure 12 It is a structural schematic diagram of the tray of the present invention; Figure 13 It is a structural schematic diagram of the lifting and rotating assembly of the present invention; Figure 14 It is a schematic structural diagram of the lifting pipe and bottom pipe of the present invention; Figure 15 It is a structural schematic diagram of the chassis, worm and worm gear of the present invention; Figure 16 It is a structural schematic diagram of the chassis and arc limiting plate of the present invention; Figure 17 It is a schematic structural diagram of the transfer assembly of the present invention; Figure 18 It is a structural schematic diagram of the lateral shift device of the present invention.

[0019] In the figure: 1. Floor scale; 2. Transfer assembly; 21. Transverse movement device; 211. Support frame; 212. Guide rail; 213. Slider; 214. Lead screw; 215. Fourth motor; 216. Frame; 217. Moving block; 22. Vertical movement device; 23. Gripper; 24. Industrial camera; 3. Lifting and rotating assembly; 31. Lifting tube; 32. Bottom tube; 321. Ear plate; 33. Chassis; 331. Stud; 332. First slide; 333. Ball; 334. Limiting arc plate; 335. Second slide; 34. First motor; 341. Connecting bolt; 35. Threaded column; 36. Threaded sleeve; 37. Worm; 38. Worm gear; 39. Second motor ;4. Outer casing;41. First top plate;42. Second top plate;43. Handle;44. Limit block;45. Arc groove;46. Inner plate;47. Electrical control box;5. Traveling mechanism;51. Travel wheel;52. Transmission shaft;53. Driven gear;54. Third motor;55. Driving gear;56. Brake plate;57. Snap groove;58. Snap plate;59. First telescopic cylinder;591. Bracket;6. Guide mechanism;61. Connecting plate;62. Arc plate;63. Connecting pipe;64. Second telescopic cylinder;7. Standard weight;71. Annular groove;72. Tray;73. End plate;8. Frame;81. Limit groove;82. Bottom plate;83. Perforation. DETAILED DESCRIPTION

[0020] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0021] The following is a further description with reference to the accompanying drawings and specific embodiments: Example 1 like Figure 1-5As shown, in order to enable regular calibration of the scale 1 without disassembling it, this embodiment provides a device for calibrating the scale 1. The device includes a frame 8, a traveling mechanism 5, standard weights 7, a lifting and rotating assembly 3, a transfer assembly 2, etc. Two sets of traveling mechanisms 5 are arranged at the front and rear ends below the frame 8, and one set of the traveling mechanisms 5 serves as a driving mechanism. After the device is placed on the side of the scale 1, it can control the frame 8 to move back and forth along the length of the scale 1, providing initial support for placing the standard weights 7 at different positions above the scale 1. Because multiple standard weights 7 are distributed up and down into at least two groups stacked on the inner side of the frame 8, in order to transfer the standard weights 7 to the floor scale 1 after the frame 8 is moved to the corresponding position, the lifting and rotating assembly 3 is installed at the end corner inside the frame 8, and the transfer assembly 2 is installed on the top of the lifting and rotating assembly 3. By utilizing the function of the transfer assembly 2 to clamp the standard weights 7, after clamping the standard weights 7, the standard weights 7 can be driven to move arbitrarily in space with the cooperation of the lifting and rotating assembly 3 and the transfer assembly 2, thereby providing support for placing the standard weights 7 on the floor scale 1.

[0022] like Figure 17 As shown, in order to achieve the clamping of the standard weight 7 by the transfer assembly 2 and control the initial movement of the standard weight 7, the transfer assembly 2 includes a clamping jaw 23, an industrial camera 24, a transverse movement device 21 and a vertical movement device 22 that are perpendicular to each other and staggered. The clamping jaw 23 and the industrial camera 24 are both installed at the bottom of the vertical movement device 22, and the clamping jaw 23 and the industrial camera 24 are arranged adjacent to each other. The transverse movement device 21 can control the vertical movement device 22 to move back and forth in the horizontal direction, and the vertical movement device 22 controls the clamping jaw 23 and the industrial camera 24 to move up and down in the vertical direction. By utilizing the opening and closing characteristics of the clamping jaw 23 to clamp the material, after the clamping jaw 23 clamps the annular groove 71 at the top of the standard weight 7, the transverse movement device 21 and the vertical movement device 22 work together to lift the standard weight 7 away from the frame 8 and place the standard weight 7 at the corresponding position on the floor scale 1. During the movement of the clamping jaw 23, it can be identified by the industrial camera 24, so that the weight can be accurately grasped and placed.

[0023] In order to complete the calibration of the floor scale 1, the device must be equipped with a control system, which needs to be equipped with signal acquisition (such as an image acquisition card), core processing devices, signal transmission and communication devices, drive and control devices, etc., and the above devices are installed in the electrical control box 47.

[0024] Signal acquisition can convert the analog or digital image signals output by industrial cameras into a format that can be processed by the control system. In addition, if the communication protocols of the industrial camera and the control system are inconsistent, a protocol converter is required to ensure accurate transmission of information between the two.

[0025] The core processing device can be set as a programmable logic controller (PLC), which can perform logical operations and processing on the collected industrial camera information, and output control instructions according to the preset program and processing results. An industrial control computer (IPC) can also be used. It has powerful data processing and computing capabilities and can run complex image processing algorithms and control programs to meet the needs of in-depth analysis of industrial camera information and precise control of motors and telescopic cylinders (which can be set as electric cylinders).

[0026] Signal transmission and communication components, including a Controller Area Network (CAN) bus and Ethernet communication modules, facilitate data transmission between the control system and the industrial camera, motor driver, and telescopic cylinder controller. Wireless communication modules can also be used to enable wireless communication between devices in scenarios where wiring is inconvenient, enhancing system flexibility. The data acquisition and processing module connects an automatic scale, such as floor scale 1, to the calibration device, collecting real-time weight data from the automatic scale before and after loading with standard weights. The data acquisition and processing module continuously collects the automatic scale's weight data and environmental parameters for a period of time to obtain a stable data sample. The collected data is then analyzed, using statistical analysis to remove outliers and calculate the actual weight of the automatic scale after loading with the standard weight. Based on the error results obtained during the data acquisition and analysis phase, the control system calculates the corresponding calibration coefficient and sends it to the automatic scale, such as floor scale 1. The automatic scale adjusts its own weighing data based on the calibration coefficient to eliminate errors.

[0027] The drive and control devices include motor drivers, which are used to receive control signals from the control system and convert them into drive signals suitable for motor operation, controlling the motor's speed, direction, etc.

[0028] like Figure 18 As shown, in order to control the movement of the clamping jaw 23 in the horizontal and vertical directions, the traverse device 21 includes a support frame 211, a lead screw 214, a moving block 217, a fourth motor 215, etc. The support frame 211 is configured as a rectangular structure. The end of the lead screw 214 is connected to the end wall of the support frame 211 through a bearing connection. The end of the lead screw 214 protruding from the support frame 211 is connected to the power output shaft of the fourth motor 215, which can control the rotation of the lead screw 214 when the fourth motor 215 is working. The moving block 217 is arranged on the side of the support frame 211, and a guide rail 212 and a slider 213 are respectively provided on the side walls where the moving block 217 and the support frame 211 are close to each other. The slider 213 is sleeved on the guide rail 212, so that the moving block 217 and the support frame 211 are stably and movably connected. In addition, the moving block 217 is connected to a threaded sleeve sleeved on the lead screw 214, so that the position of the moving block 217 can be adjusted when the lead screw 214 rotates.

[0029] like Figure 17 As shown, in addition, the vertical moving device 22 has the same structure as the transverse moving device 21, except that the support frame 211 of the vertical moving device 22 is in the vertical direction, and the moving block 217 of the vertical moving device 22 is connected to the moving block 217 of the transverse moving device 21 by bolts. Therefore, when the fourth motor 215 of the vertical moving device 22 is working, the support frame 211 of the vertical moving device 22 can be controlled to rise and fall relative to the support frame 211 of the transverse moving device 21, thereby adjusting the rise and fall of the clamping claw 23 installed at the bottom of the support frame 211 of the vertical moving device 22.

[0030] like Figure 13 、 Figure 14 As shown, in order to further adjust the height of the clamping jaw 23 and rotate the clamping jaw 23 around the vertical axis, the lifting and rotating assembly 3 includes a chassis 33 movably mounted on the frame 8, a bottom tube 32 vertically mounted above the chassis 33, and a lifting tube 31 whose bottom is lifted and inserted into the inner side of the bottom tube 32. The top of the lifting tube 31 is connected by bolts and inserted into the sleeve frame 216 at the bottom of the support frame 211 of the transverse moving device 21, and the lifting tube 31 drives the transverse moving device 21 to rise and fall. Therefore, when the lifting tube 31 is raised or lowered, the height of the clamping jaw 23 can be adjusted again to provide additional support for the transfer of the standard weight 7. Because the chassis 33 can rotate relative to the frame 8, the direction of the transverse moving device 21 can be adjusted through the chassis 33, thereby controlling the rotation of the clamping jaw 23 around the axis.

[0031] like Figure 15 As shown, in order to realize the rotation of the chassis 33, the chassis 33 is mounted on the end shaft of the worm gear 38, and a worm 37 is meshed with the side of the worm gear 38. At the same time, the worm gear 38 and the worm 37 are mounted on the same frame, which is fixedly connected to the frame 8. The power output shaft of the second motor 39 arranged on the outer side of the end of the frame is connected to the worm 37. Therefore, when the second motor 39 is working, the worm 37 can be controlled to drive the worm gear 38 to rotate, thereby controlling the chassis 33 to rotate around the axis.

[0032] like Figure 16 As shown, to increase the stability of the chassis 33, two limiting arc plates 334 are bolted together on the outside of the chassis 33. The legs of the two limiting arc plates 334, facing away from each other, are fixedly connected to the frame 8. A first slide groove 332 and a second slide groove 335 are respectively provided on the side walls adjacent to the limiting arc plates 334 and the chassis 33. A plurality of balls 333 are disposed within the space formed by the first and second slide grooves 332 and 335. When the limiting arc plates 334 are stably connected to the frame 8, the rotation of the balls 333 stabilizes the chassis 33 within the space formed by the two limiting arc plates 334. Consequently, the chassis 33 is stably mounted under the action of the limiting arc plates 334.

[0033] like Figure 15As shown, to adjust the height of the lifting tube 31, a first motor 34 is installed upside down above the chassis 33. The lug 321 at the bottom of the bottom tube 32 is mounted on a stud 331 on the chassis 33. The first motor 34 is located inside the bottom tube 32 and is connected to the bottom tube 32 via a connecting bolt 341. A threaded stud 35 is connected to the power output shaft of the first motor 34. A threaded sleeve 36 is mounted on the threaded stud 35 and is installed at the bottom inside the lifting tube 31. When the first motor 34 is in operation and controls the rotation of the threaded stud 35, the lifting tube 31 can be raised or lowered, adjusting the height of the traverse device 21.

[0034] like Figure 8 As shown, in order to stably support the movement of the frame 8, the two sets of running mechanisms 5 each include two running wheels 51, and the central axes of the two running wheels 51 are connected and mounted on the frame 8 through a bearing seat. In order to drive the frame 8 to move, one set of the running mechanisms 5 is connected between the central axes of the two running wheels 51 and is provided with a transmission shaft 52. A driven gear 53 is sleeved on the transmission shaft 52. The driving gear 55 meshing with the side of the driven gear 53 is mounted on the power output shaft of the third motor 54. When the third motor 54 is working, the two running wheels 51 can be driven to rotate through the transmission shaft 52.

[0035] like Figure 8 、 Figure 9 As shown, in order to stably park the stopped frame 8, an adjustable brake plate 56 is provided on the side of the driving gear 55 or the driven gear 53. The brake plate 56 is provided with a structure that meshes with the gear, and the brake plate 56 is installed at the telescopic end of the first telescopic cylinder 59. At the same time, the first telescopic cylinder 59 is connected to the frame 8 via a bracket 591. When the first telescopic cylinder 59 is in operation, the brake plate 56 can be controlled to move closer to or away from the gear. When the brake plate 56 meshes with the driving gear 55 or the driven gear 53, the driving gear 55 or the driven gear 53 is braked. In order to stably mount the brake plate 56 on the frame 8, a snap groove 57 with an open end is provided on the side of the brake plate 56 away from the gear. A snap plate 58 provided through the snap groove 57 is fixedly mounted on the frame 8.

[0036] like Figure 1-5 、 Figure 10As shown, in order to guide the movement of the device, a guiding mechanism 6 that is in sliding contact with the side rails of the scale 1 is adjusted and set on the outer side of the bottom of the frame 8. The guiding mechanism 6 includes a connecting plate 61, a connecting pipe 63 hingedly set at the bottom of the connecting plate 61, and a second telescopic cylinder 64. The connecting pipe 63 is detachably mounted on the bottom of the frame 8, and the end of the second telescopic cylinder 64 away from the connecting plate 61 is hingedly connected to the frame 8, so that the connecting plate 61 can be controlled to rotate when the length of the second telescopic cylinder 64 changes, even if the connecting plate 61 is adjusted from a vertical state to an inclined or horizontal state. An arc-shaped plate 62 is fixedly installed on the top of the connecting plate 61. When the connecting plate 61 rotates around the axis, the arc-shaped plate 62 can be set close to or even fit the side rails of the scale 1, thereby limiting the position of the frame 8 relative to the scale 1 and guiding it to move in a predetermined direction.

[0037] like Figure 11 、 Figure 12 As shown, in order to stably place the standard weights 7 on the inner side of the frame 8, each standard weight 7 is supported on a tray 72. The trays 72 of the same group located on the same plane are fixedly connected, and an end plate 73 is fixedly provided on the edge of each group of trays 72. A limiting groove 81 with an open end is provided on the inner side wall of the frame 8. The end plates 73 of the multiple groups of trays 72 distributed up and down are inserted into their respective limiting grooves 81. The stable installation of the trays 72 can be controlled by the cooperation of the end plates 73 and the limiting grooves 81. Since the trays 72 are sleeved on the bottom of the standard weights 7, the stable placement of the standard weights 7 can be controlled. After the upper layer of standard weights 7 are transferred to the floor scale 1, the clamping claws 23 clamp the tray 72 to make it rise and detach from the frame 8, providing convenience for the transfer of the lower layer of standard weights 7.

[0038] Example 2 like Figure 5 、 Figure 6 As shown, on the basis of Example 1, in order to achieve good storage of the standard weights 7, a shell 4 is provided on the outside of the frame 8, and a first top plate 41 and a second top plate 42 are provided on the top of the shell 4, and a bottom plate 82 is provided at the bottom of the inside of the frame 8. A relatively closed storage space can be formed by the cooperation of the shell 4, the bottom plate 82, the first top plate 41 and the second top plate 42.

[0039] like Figure 7 As shown, a through hole 83 is provided on the bottom plate 82 , and the bottom plate 33 is located at the through hole 83 .

[0040] like Figure 6 As shown, to facilitate the removal and placement of the standard weight 7, a first top plate 41 is fixedly mounted on the housing 4, while a second top plate 42 is removable. An inner plate 46 is provided at the protruding area of ​​the first top plate 41, connected via a mechanical seal. The bottom tube 32 extends through the inner plate 46. An arcuate groove 45 is provided at the end of the second top plate 42 adjacent to the first top plate 41, with the protrusion of the first top plate 41 in sealing contact with the arcuate groove 45.

[0041] like Figure 6 As shown, in order to ensure a stable connection between the second top plate 42 and the frame 8, a plurality of limit blocks 44 are provided on the bottom frame of the second top plate 42, and the limit blocks 44 are inserted into the limit grooves 81 of the frame 8. In addition, a handle 43 installed above the second top plate 42 can be clamped by the clamping claws 23 to provide support for adjusting the position of the second top plate 42.

[0042] The above is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An online calibration device for an automatic weighing instrument, characterized in that: The invention comprises a frame (8), a walking mechanism (5) arranged below the frame (8) and driving the frame (8) to move back and forth along the length direction of the floor scale (1), and a guide mechanism (6) arranged at the bottom of the outer side of the frame (8) and in sliding contact with the side rail of the floor scale (1); a plurality of standard weights (7) are stacked on the inner side of the frame (8), and a lifting and rotating assembly (3), a transverse moving device (21) installed on the top of the lifting and rotating assembly (3), a vertical moving device (22) arranged on the side of the transverse moving device (21), a clamping claw (23) installed at the bottom of the vertical moving device (22), and an industrial camera (24) are vertically arranged at the end corner of the inner side of the frame (8); the clamping claw (23) clamps the top of the standard weight (7), and the lifting and rotating assembly (3), the transverse moving device (21) and the vertical moving device (22) control the clamping claw (23) to move in space and transfer the standard weight (7) to the floor scale (1).

2. The online calibration device for an automatic weighing instrument according to claim 1, characterized in that: The transverse movement device (21) comprises a support frame (211), a lead screw (214) arranged on the inner side of the support frame (211), and a moving block (217) slidably arranged on the side of the support frame (211) and threadedly sleeved on the lead screw (214), the end of the lead screw (214) is connected to the power output shaft of the fourth motor (215), and the fourth motor (215) is installed at the end of the support frame (211); a guide rail (212) and a slider (213) are respectively arranged on the side walls of the moving block (217) and the support frame (211) that are close to each other.

3. The online calibration device for an automatic weighing instrument according to claim 2, characterized in that: The vertical moving device (21) and the horizontal moving device (22) have the same structure, and the moving block (217) of the vertical moving device (22) and the moving block (217) of the horizontal moving device (21) are connected by bolts, and the vertical moving device (22) and the horizontal moving device (21) are in a mutually perpendicular state.

4. The online calibration device for an automatic weighing instrument according to claim 2, characterized in that: The lifting and rotating assembly (3) includes a chassis (33) movably mounted on a frame (8), a bottom tube (32) vertically mounted above the chassis (33), and a lifting tube (31) whose bottom is lifted and inserted into the inner side of the bottom tube (32); the top of the lifting tube (31) is connected by bolts and inserted into the sleeve frame (216) at the bottom of the support frame (211) of the transverse moving device (21), and the lifting tube (31) drives the transverse moving device (21) to rise and fall, while the chassis (33) rotates to adjust the direction of the transverse moving device (21).

5. The online calibration device for an automatic weighing instrument according to claim 4, characterized in that: A first motor (34) is invertedly arranged above the chassis (33), and the ear plate (321) at the bottom of the bottom tube (32) is sleeved on the stud (331) of the chassis (33), and the first motor (34) is located on the inner side of the bottom tube (32); a threaded column (35) is connected to the power output shaft of the first motor (34), and a threaded sleeve (36) sleeved on the threaded column (35) is installed at the bottom of the inner side of the lifting tube (31); the chassis (33) is installed on the end shaft of the worm wheel (38), and a worm (37) is meshed with the side of the worm wheel (38), and the worm wheel (38) and the worm (37) are installed on the same frame; the frame is fixedly connected to the frame (8), and the power output shaft of the second motor (39) arranged on the outer side of the frame end is connected to the worm (37).

6. The online calibration device for automatic weighing instruments according to claim 5, characterized in that: Two limiting arc plates (334) are provided on the outer side of the chassis (33) and are connected by bolts. A first slide groove (332) and a second slide groove (335) are provided on the side walls adjacent to the limiting arc plates (334) and the chassis (33), respectively. A plurality of balls (333) are provided in the space formed by the first slide groove (332) and the second slide groove (335); the legs of the two limiting arc plates (334) on the side away from each other are fixedly connected to the frame (8).

7. The online calibration device for an automatic weighing instrument according to claim 1, characterized in that: The two sets of the walking mechanisms (5) arranged front and back respectively include two walking wheels (51), the central axes of the two walking wheels (51) are connected and mounted on the frame (8) through a bearing seat; one set of the walking mechanisms (5) is provided with a transmission shaft (52) connected between the central axes of the two walking wheels (51), a driven gear (53) is sleeved on the transmission shaft (52), and a driving gear (55) meshed with the side of the driven gear (53) is mounted on the power output shaft of the third motor (54).

8. The online calibration device for automatic weighing instruments according to claim 7, characterized in that: A brake plate (56) is adjustable and provided on the side of the driving gear (55) or the driven gear (53); a structure engaging with the gear is provided on the brake plate (56); and a snap groove (57) with an open end is provided on the side of the brake plate (56) away from the gear. A snap plate (58) penetrating the snap groove (57) is fixedly installed on the frame (8); the brake plate (56) is installed at the telescopic end of the first telescopic cylinder (59), and the first telescopic cylinder (59) is connected to the frame (8) through a bracket (591).

9. The online calibration device for an automatic weighing instrument according to claim 1, characterized in that: The guiding mechanism (6) comprises a connecting plate (61), a connecting pipe (63) hingedly arranged at the bottom of the connecting plate (61), and a second telescopic cylinder (64); the connecting pipe (63) is detachably mounted at the bottom of the frame (8); the second telescopic cylinder (64) is hingedly connected to the frame (8) at one end away from the connecting plate (61); an arc-shaped plate (62) is fixedly mounted on the top of the connecting plate (61); the second telescopic cylinder (64) adjusts the arc-shaped plate (62) to be positioned adjacent to the side rail of the weighing scale (1).

10. The online calibration device for automatic weighing instruments according to claim 1, characterized in that: Each of the standard weights (7) is supported on a tray (72), and the trays (72) of the same group located on the same plane are fixedly connected, and an end plate (73) is fixedly provided on the edge of each group of trays (72); a limiting groove (81) with an open end is provided on the inner side wall of the frame (8), and the end plates (73) of the multiple groups of trays (72) distributed up and down are inserted into the respective limiting grooves (81); an annular groove (71) is provided on the top of each of the standard weights (7), and the clamping claw (23) clamps the annular groove (71) of the standard weight (7) or the tray (72) to lift and lower.

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