LU504199B1

LU504199B1 - Electronic weighing apparatus

Info

Publication number: LU504199B1
Application number: LU504199A
Authority: LU
Inventors: Yinxuan Mao; Tengfei Zhang; Jin Xu; Dongbo Zhang
Original assignee: Henan Hengda Mechanical&Electrical Equipment Co Ltd
Priority date: 2023-05-11
Filing date: 2023-05-11
Publication date: 2023-11-14

Abstract

The disclosure discloses an electronic weighing device, including a weighing body; a pressure sensor mounted on an upper end of the weighing body; a load-bearing device provided above the pressure sensor, in which the load-bearing device includes a load- bearing disc sliding up and down above the weighing body; and a buffer assembly provided between the load-bearing disc and the pressure sensor. When the object falls on the load-bearing disc, the auxiliary structure provides an upward resistance for the buffer cylinder, thus when the buffer cylinder fall slowly, the buffer structure provides an upward thrust for the load-bearing disc through the buffer cylinder to cushion the impact. Under the effect of gravity and inertia of the object, when the load-bearing disc drives the buffer cylinder down to the preset position, the resistance disappears so that the lower end of the buffer cylinder and the pressure sensor are pressed against each other.

Description

DESCRIPTION LU504199

ELECTRONIC WEIGHING APPARATUS

TECHNICAL FIELD

[0001] The disclosure relates to the technical field of weighing apparatus, and specifically to an electronic weighing apparatus.

BACKGROUND ART

[0002] Electronic weighing apparatus is a kind of scale. Scales are tools that use Hooke's law or the principle of lever balance of force to determine the mass of an object, and can be divided into three categories according to the structural principle: mechanical scales, electronic scales, and electromechanical combination scales. Electronic scales are mainly composed of a load-bearing system (such as a loading tray, loading body), a force transfer system (such as a lever transfer system, a sensor) and a display value system (such as a dial, an electronic display instrument). Electronic weighing apparatus works on the principle that when an object is placed on a load-bearing system, such as a loading tray, pressure is applied to the sensor, causing the sensor to undergo elastic deformation, thereby causing its impedance to change, while through the changed excitation voltage, a changing analog signal is output. This signal is amplified by an amplifier circuit and output to an analog-to-digital converter, and is converted into a digital signal for easy processing and output to the CPU for computing and control. The CPU outputs this result to the display according to the keyboard command as well as the program until the weighing result is displayed. However, when the object to be weighed is placed on the weighing system, an object falls on the weighing system due to the heavy object or an unstable clamping, which may cause the sensor to undergo elastic deformation too fag 204199 thus damaging the sensor.

DISCLOSURE

[0003] The present disclosure provides an electronic weighing apparatus to solve the above problems.

[0004] An electronic weighing device of the present disclosure uses the following technical solution.

[0005] The disclosure provides an electronic weighing device, including a weighing body; a pressure sensor mounted on an upper end of the weighing body; a load-bearing device provided above the pressure sensor, in which the load-bearing device includes a load- bearing disc sliding up and down above the weighing body; and a buffer assembly provided between the load-bearing disc and the pressure sensor;

[0006]wherein the buffer assembly includes a sealed buffer cylinder and a buffer structure; the buffer cylinder is slidingly mounted on the weighing body; a reset spring is connected between the buffer cylinder and the pressure sensor; a support cylinder is provided below the buffer cylinder; a lower end of the support cylinder is fixed on the weighing body, and an upper end of the support cylinder slides to cooperate with the buffer cylinder; the buffer structure is used to provide an upward thrust for the load- bearing disc by the buffer cylinder when the object is dropped on the load-bearing disc; the support cylinder is provided with an auxiliary structure; the auxiliary structure is used to provide an upward resistance to the buffer cylinder when the object is dropped on the load-bearing disc, so that the buffer cylinder slowly falls to a predetermined position and then the resistance disappears to make an lower end of the buffer cylinder and the pressure sensor press against each other.

[0007] Further, the buffer structure includes a separator cylinder inside the buffer cylinder, in which the separator cylinder is coaxial with the buffer cylinder,an upper end of separator cylinder is fixed on a top wall of the buffer cylinder and a gap is provided between an lower end of the separator and an bottom wall of the buffer cylinder; the separator cylinder”>°*" 99 separates the buffer cylinder into an inner hydraulic cylinder and an outer hydraulic cylinder; the inner hydraulic cylinder is slidingly provided with an inner piston fixedly connected to the load-bearing disc by a connecting rod; the outer hydraulic cylinder is slidingly provided with an outer piston, and the upper end of the outer piston is fixed with a telescopic rod; an upper end of the telescopic rod extends beyond the buffer cylinder and is fixed with a top ring; the top ring is abutted against the load-bearing disc; and a buffer spring is connected between the top ring and the buffer cylinder.

[0008] Further, the auxiliary structure includes an auxiliary piston, and a vent hole, in which the vent hole is on a sidewall of the support cylinder; the auxiliary piston is slidingly installed in the support cylinder; the auxiliary piston separates the support cylinder into an upper cylinder and a lower cylinder which are not in communication with each other; in an initial state, the auxiliary piston seals the vent hole, and the lower cylinder of the support cylinder is sealed with air; an upper end of the auxiliary piston is fixed with a sealing plug through a connecting rod; the sealing plug is fixed with the outer piston, and the sealing plug and the support cylinder are slidingly sealed; and the auxiliary piston is provided with a through hole.

[0009] Further, a slide cylinder is fixed on the weighing body; and the buffer cylinder is slidingly mounted on an inner wall of the slide cylinder.

[0010] The advantageous effect of the disclosure is as follows. when the object falls on the load-bearing disc, the auxiliary structure provides an upward resistance for the buffer cylinder, thus when the buffer cylinder fall slowly, the buffer structure provides an upward thrust for the load-bearing disc through the buffer cylinder to cushion the impact. Under the effect of gravity and inertia of the object, when the load-bearing disc drives the buffer cylinder down to the preset position, the resistance disappears so that the lower end of the buffer cylinder and the pressure sensor are pressed against each other, thus making the object slowly press against the pressure sensor and avoiding the damage of the pressure sensor due to rapid elastic deformation.

BRIEF DESCRIPTION OF DRAWINGS 0504139

[0011] The accompanying drawings are for exemplary illustration only and are not to be construed as limiting the disclosure; certain parts of the accompanying drawings are omitted, enlarged or reduced for the purpose of better illustrating this embodiment and do not represent the dimensions of the actual product; it is understandable to those skilled in the art that certain well-known structures in the accompanying drawings and their descriptions may be omitted.

[0012] FIG. 1 is a schematic view of an embodiment of an electronic weighing apparatus of the present disclosure;

[0013]FIG. 2 is a sectional view of the buffer assembly of an embodiment of the present disclosure;

[0014] FIG. 3 is an enlarged view at part A in FIG. 2;

[0015]FIG. 4 is a schematic view of a load-bearing disc, a buffer cylinder of an embodiment of the present disclosure;

[0016] FIG. 5 is a front view of the load-bearing disc, buffer cylinder of embodiments of the present disclosure; and

[0017] FIG. 6 is a schematic view of another angle of the load-bearing disc, buffer cylinder of the embodiment of the present disclosure.

[0018] In drawings: 100, weighing body; 120, pressure sensor; 130, slide cylinder; 200, load-bearing disc; 210, buffer spring; 300, buffer assembly; 310, buffer cylinder; 311, contact convexity; 320, reset spring; 330, support cylinder; 341, inner hydraulic cylinder; 342, outer hydraulic cylinder; 343, outer piston; 345, top ring; 351, auxiliary piston 352, vent hole; 353, sealing plug; 354, through hole.

Best Mode LU504199

[0019]In order to enable those skilled in the art to better understand the scheme of the disclosure, the technical solutions in the embodiments of the disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the disclosure, and it is clear that the embodiments described are only some of the embodiments of the disclosure, and not all of them. Based on the embodiments in the disclosure, all other embodiments obtained by those skilled in the art without making creative labor shall fall within the scope of protection of the disclosure.

[0020] In the description of the disclosure, it is to be understood that the terms indicating orientation or positional relationships such as "center", "longitudinal", "transverse", "length", "width”, "thickness", "upper", "lower", "front", "back", "left", "right", "vertical ", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", " radial", "circumferential" and the like are based on the orientation or positional relationships shown in the accompanying drawings, and are intended only to facilitate and simplify the description of the disclosure, not to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore are not to limit the disclosure.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or as implicitly specifying the number of technical features indicated. Thus, the features qualified with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

[0022] In the disclosure, unless otherwise expressly specified and limited, the terms "mounted", "attached", "connected", "fixed", etc. shall be used in a broad sense, e.g., they may be fixed connections, or removable connections, or in one piece; they may be mechanical connections, or electrical connections or communicable with each other; they may be directly connected, or indirectly connected through an intermediate medium, and they may be a connection within two elements or an interactive relationship between two elements, unless otherwise expressly limited. To those skilled in the art, the specific 204199 meaning of the above terms in the context of the disclosure can be understood on a case- by-case basis.

[0023] The disclosure is further described below in connection with the accompanying drawings.

[0024] As shown in figs,1-6, the disclosure provides an electronic weighing device, including a weighing body 100; a pressure sensor 120 mounted on an upper end of the weighing body 100; a load-bearing device provided above the pressure sensor, in which the load-bearing device includes a load-bearing disc 200 sliding up and down above the weighing body 100; and a buffer assembly 300 provided between the load-bearing disc 200 and the pressure sensor 120. Further, the buffer assembly 300 includes a sealed buffer cylinder 310 and a buffer structure. Further, a slide cylinder 130 is fixed on the weighing body 100; and the buffer cylinder 310 is slidingly mounted on an inner wall of the slide cylinder 130. Further, a reset spring 320 is connected between the buffer cylinder 310 and the pressure sensor 120; a support cylinder 330 is provided below the buffer cylinder 310; a lower end of the support cylinder 330 is fixed on the weighing body 100, and an upper end of the support cylinder 330 slides to cooperate with the buffer cylinder 310. Further, the buffer structure includes a separator cylinder inside the buffer cylinder, in which the separator cylinder is coaxial with the buffer cylinder 310,an upper end of separator cylinder is fixed on a top wall of the buffer cylinder 310 and a gap is provided between an lower end of the separator and an bottom wall of the buffer cylinder 310; the separator cylinder separates the buffer cylinder 310 into an inner hydraulic cylinder 341 and an outer hydraulic cylinder 342. In addition, a display is provided on the weighing body 100.

[0025] The inner hydraulic cylinder 341 is slidingly provided with an inner piston fixedly connected to the load-bearing disc 200 by a connecting rod; the outer hydraulic cylinder 342 is slidingly provided with an outer piston 343, and the upper end of the outer piston 343 is fixed with a telescopic rod; an upper end of the telescopic rod extends beyond the buffer cylinder 310 and is fixed with a top ring 345; the top ring 345 is abutted against the load-bearing disc 200; and a buffer spring 210 is connected between the top ring 345 artd/>041 99 the buffer cylinder 310 to drive the buffer cylinder 310 to reset upward after the weighing is finished. The cross-sectional area of the inner hydraulic cylinder 341 is larger than that of the outer hydraulic cylinder 342, so that when the inner piston moves down a unit distance, the top ring 345 is driven up a greater distance than the unit distance, which improves the response sensitivity when cushioning.

[0026] Further, an auxiliary structure is privided in the support cylinder 330. The auxiliary structure includes an auxiliary piston 351, and a vent hole 352, in which the vent hole 352 is on a sidewall of the support cylinder 330; the auxiliary piston 351 is slidingly installed in the support cylinder 330; the auxiliary piston 351 separates the support cylinder 330 into an upper cylinder and a lower cylinder which are not in communication with each other. In an initial state, the auxiliary piston 351 seals the vent hole 352, and the lower cylinder of the support cylinder 330 is sealed with air; an upper end of the auxiliary pisto351 is fixed with a sealing plug 353 through a connecting rod; the sealing plug 353 is fixed with the outer piston 343, and the sealing plug 353 and the support cylinder 330 are slidingly sealed; and the auxiliary piston is provided with a through hole 354. When an object falls on the load-bearing disc 200, the auxiliary structure provides an upward resistance for the buffer cylinder 310 when the object is dropped on the load-bearing disc, so that when the buffer cylinder 310 slowly falls, the upward resistance provides support for the buffer cylinder 310, allowing the buffer structure to provide an upward thrust to the load-bearing disc 200 through the buffer cylinder 310 to cushion the impact. When the load-bearing disc 200 drives the buffer cylinder 310 downward to a predetermined position under the gravity of the object, then the resistance disappears to make an lower end of the buffer cylinder 310 and the pressure sensor 120 press against each other thus allowing the object to be pressed against the pressure sensor 120 slowly and avoiding the pressure sensor 120 from being damaged by the rapid elastic deformation.

[0027] Combined with the above embodiment, the principle of use and working process of the present disclosure is as follows. When used, when the object is placed on the load- bearing disc 200, when the object is dropped on the load-bearing disc 200, the buffer assembly 300 as a whole moves downward under the effect of the gravity of the object and the impact of the fall, at this time, as the auxiliary piston 351 seals the vent hole 3504504199 before the auxiliary piston 351 opens the vent hole 352, the auxiliary piston 351 compresses the air in the lower cylinder of the support cylinder 330 to provide an upward resistance for the downward movement of the buffer cylinder 310, and at the same time provides an upward support force for the resistance for the buffer cylinder 310. During this process, the gravity of the object and the impact of the fall presses down on the inner piston through the connecting rod, causing the hydraulic fluid of the inner hydraulic cylinder 341 to enter the outer hydraulic cylinder 342, driving the outer piston 343 upward, compressing the cushion spring 210, and providing an upward cushioning force for the load-bearing disc 200. When the object falls smoothly on the load-bearing disc 200, the load-bearing disc 200 drives the buffer cylinder 310 to move down to the preset position under the effect of the object's gravity and motion inertia, the auxiliary piston 351 and the vent hole 352 are staggered so that the air in the lower cylinder of the support cylinder 330 enters the outside world through the through hole 354 on the auxiliary piston 351, the gap between the sealing plug 353 and the auxiliary piston 351, and the vent hole 352 into the outside, so that the overall weight of the object is pressed against the pressure sensor 120. When the weighing is finished, the reset spring 320 drives the buffer cylinder 310 to reset, and the buffer spring 210 makes the inner and outer pistons 343 to reset, thus driving the sealing plug 353 and the auxiliary piston 351 to move up and re-seal the vent hole 352.

[0028] Obviously, the above embodiments of the disclosure are merely examples made to clearly illustrate the disclosure and are not meant to limit the manner in which the disclosure can be implemented. For those skilled in the art, other variations or changes in different forms can be made on the basis of the above description. It is not necessary or possible to exhaust all embodiments here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the disclosure shall be included within the scope of protection of the claims of the disclosure.

Claims

CLAIMS LU504199

1. An electronic weighing device, including a weighing body; a pressure sensor mounted on an upper end of the weighing body; a load-bearing device provided above the pressure sensor, in which the load-bearing device includes a load-bearing disc sliding up and down above the weighing body; and a buffer assembly provided between the load-bearing disc and the pressure sensor; wherein the buffer assembly includes a sealed buffer cylinder and a buffer structure; the buffer cylinder is slidingly mounted on the weighing body; a reset spring is connected between the buffer cylinder and the pressure sensor; a support cylinder is provided below the buffer cylinder; a lower end of the support cylinder is fixed on the weighing body, and an upper end of the support cylinder slides to cooperate with the buffer cylinder; the buffer structure is used to provide an upward thrust for the load-bearing disc by the buffer cylinder when the object is dropped on the load-bearing disc; the support cylinder is provided with an auxiliary structure; the auxiliary structure is used to provide an upward resistance to the buffer cylinder when the object is dropped on the load-bearing disc, so that the buffer cylinder slowly falls to a predetermined position and then the resistance disappears to make a lower end of the buffer cylinder and the pressure sensor press against each other.

2. The electronic weighing device of claim 1, wherein the buffer structure includes a separator cylinder inside the buffer cylinder, in which the separator cylinder is coaxial with the buffer cylinder, an upper end of separator cylinder is fixed on a top wall of the buffer cylinder and a gap is provided between an lower end of the separator and an bottom wall of the buffer cylinder; the separator cylinder separates the buffer cylinder into an inner hydraulic cylinder and an outer hydraulic cylinder; the inner hydraulic cylinder is slidingly provided with an inner piston fixedly connected to the load-bearing disc by a connecting rod; the outer hydraulic cylinder is slidingly provided with an outer piston, and the upper end of the outer piston is fixed with a telescopic rod; an upper end of the telescopic rod extends beyond the buffer cylinder and is fixed with a top ring; the top ring is abutted/°04199 against the load-bearing disc; and a buffer spring is connected between the top ring and the buffer cylinder.

3. The electronic weighing device of claim 2, wherein the auxiliary structure includes an auxiliary piston, and a vent hole, in which the vent hole is on a sidewall of the support cylinder; the auxiliary piston is slidingly installed in the support cylinder; the auxiliary piston separates the support cylinder into an upper cylinder and a lower cylinder which are not in communication with each other; in an initial state, the auxiliary piston seals the vent hole, and the lower cylinder of the support cylinder is sealed with air; an upper end of the auxiliary piston is fixed with a sealing plug through a connecting rod; the sealing plug is fixed with the outer piston, and the sealing plug and the support cylinder are slidingly sealed; and the auxiliary piston is provided with a through hole.

4. The electronic weighing device of claim 3, wherein a slide cylinder is fixed on the weighing body; and the buffer cylinder is slidingly mounted on an inner wall of the slide cylinder.