A miniature electromagnetic force weighing device

Abstract

The present application relates to the field of weighing device, especially to a micro electromagnetic force weighing device, a base is provided with a telescopic adjusting lever, and both ends of the lever are respectively provided with a scale pan and a movable magnetic steel, the lever is composed of a sub-lever and a mother lever, the end of the sub-lever is fixedly provided with an extension rod, the mother lever is correspondingly provided with an adjusting cavity for the extension rod, and both sides of the adjusting cavity are movably provided with clamping blocks for locking the extension rod. In the present application, the weighing of workpieces can be realized through the matching arrangement of the lever, the scale pan and the magnetic steel, the length of the lever can be discretely and rigidly adjusted through the splicing design of the sub-lever and the mother lever, and the lever ratio can be adjusted to adapt to different weighing ranges, and all components in the device are horizontally arranged on the base to reduce the size of the device.

Description

Technical Field

[0001] This invention relates to the field of weighing device technology, and in particular to a miniature electromagnetic force weighing device. Background Technology

[0002] Weighing technology is a key foundation for modern precision instruments, pharmaceuticals, chemical analysis, materials science, and high-end manufacturing. Among them, electronic balances based on the principle of electromagnetic force balance have become the mainstream choice in laboratories and industrial fields due to their advantages such as high accuracy, fast response, and digital output.

[0003] In existing electromagnetic weighing devices, the lever ratio is fixed at the factory. A high lever ratio design can amplify minute mass changes, achieving extremely high resolution and accuracy, but at the cost of a very small weighing range. While devices with a low lever ratio can handle larger weights, their accuracy drops significantly. Users needing to cover different weighing ranges must purchase multiple balances of different specifications, which is inconvenient. Therefore, there is an urgent need for a miniature electromagnetic weighing device with an adjustable lever ratio. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a miniature electromagnetic force weighing device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A miniature electromagnetic force weighing device includes a base, on which a telescopic and adjustable lever is provided, and at each end of the lever are a weighing pan and a movable magnet, respectively. The lever is composed of a sub-lever and a mother lever. An extension rod is fixedly provided at the end of the sub-lever. An adjustment cavity is adapted to the extension rod on the mother lever. Both sides of the adjustment cavity are movably provided with locking blocks for locking the extension rod. A push rod for pushing the magnet is movably arranged below the mother lever. A top groove is provided on the top of the push rod, and multiple horizontal columns and vertical columns are fixedly arranged in the top groove. One end of the mother lever is located above the push rod and is provided with a movable seat. Both sides of the movable seat are fixedly provided with push seats for unlocking the locking block, and a gravity block adapted to the horizontal column is vertically movably arranged inside the movable seat. The bottom of the mother lever is located behind the movable seat and is fixedly provided with a magnetic block for attracting the gravity block by a fixed post. The bottom of the fixed post is provided with multiple elastic clips for locking the movable seat.

[0006] Furthermore, in a preferred configuration, a PCB board and a heat sink are mounted on the base above the magnet and the lever, and a housing is mounted on the outer side of the base.

[0007] In addition, in a preferred configuration, the sub-lever is mounted on one side of the magnet, and multiple slots adapted to the locking blocks are provided on both sides of the extension rod, and a pushing surface is provided on the magnet corresponding to the push rod.

[0008] Furthermore, in a preferred configuration, both the push surface and one end of the push rod are provided with inwardly opening rope grooves, and the rope grooves on both sides are connected by a traction rope.

[0009] Furthermore, in a preferred configuration, the mother lever has communicating side cavities on both sides of the adjustment cavity, and the locking blocks are adapted to move within the side cavities. The locking blocks and the inner walls of the side cavities are connected by multiple springs. The bottom of each locking block extends out of the mother lever and is fitted with a push block, and a suitable slope is provided between the push block and the push seat.

[0010] In addition, a preferred structure is that one end of the mother lever has a guide cavity, the top of the movable seat is fixedly provided with a guide post adapted to the guide cavity, the bottom of the mother lever has a slide rail cavity, and the push rod is adapted to move in the slide rail cavity by an electric slider.

[0011] In addition, a preferred structure is that the bottom of the movable seat has an upward-facing cavity, a gravity block is vertically movably arranged in the cavity, a through cavity is opened on one side of the movable seat located in the cavity, and a retaining plate is provided on both sides below the through cavity.

[0012] In addition, a preferred structure is that a magnetic block is fixedly installed on the fixed column, the magnetic block is adapted to the cavity, and the top of the gravity block is made of magnetic material and is adapted to and attracted to the magnetic block.

[0013] In addition, a preferred structure is that the bottom of the fixing column is fixedly provided with a plurality of elastic clips adapted to the card plate, and each elastic clip is provided with a male inclined surface and a female inclined surface.

[0014] In addition, in a preferred structure, two columns are fixedly installed above each of the horizontal columns, and each column has a corresponding sub-push surface adapted to the sub-sloping surface, and each column has a corresponding mother push surface adapted to the mother slope.

[0015] The beneficial effects of this invention are as follows: the workpiece can be weighed by adapting the lever, weighing pan and magnet. The structure of the push rod driving the magnet displacement by splicing the sub-lever and the mother lever can be used to discretely and rigidly adjust the lever length, thereby adjusting the lever ratio to adapt to different weighing ranges. In addition, all components in this device are arranged horizontally on the base to reduce the size of the device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a miniature electromagnetic force weighing device proposed in this invention; Figure 2 for Figure 1 A schematic diagram of the structure after the shell is hidden; Figure 3 for Figure 2 A schematic diagram of the PCB board and heat sink hidden in the image; Figure 4 for Figure 3 A schematic diagram of the lever after it has been stretched. Figure 5 This is a schematic diagram of the structure between the magnet and the lever proposed in this invention; Figure 6 This is a schematic diagram of the sub-lever structure proposed in this invention; Figure 7 This is a schematic diagram of the structure of the mother lever proposed in this invention; Figure 8 This is a schematic diagram of the push rod structure proposed in this invention; Figure 9 for Figure 8 Enlarged detail of the column in the middle; Figure 10 This is a schematic diagram of the top view of the mother lever proposed in this invention; Figure 11 for Figure 10 Enlarged detail of the movable seat in the middle; Figure 12 for Figure 11 A schematic diagram of the structure after the movable seat is hidden; Figure 13 for Figure 12 A schematic diagram of the internal structure of the side cavity; Figure 14 This is a schematic diagram of the structure of the fixed column proposed in this invention; Figure 15 for Figure 14 A structural schematic diagram of the fixed column from another perspective; Figure 16 This is a schematic diagram of the structure of the movable seat proposed in this invention; Figure 17 for Figure 16 A structural diagram of the movable seat from another perspective; Figure 18 for Figure 17 Enlarged detail of the card plate in the middle; Figure 19 This is a schematic diagram of the explosive structure between the movable seat and the gravity block proposed in this invention.

[0017] In the diagram: 1. Base, 11. PCB board, 12. Heat sink, 13. Weighing pan, 14. Magnet, 141. Pushing surface, 15. Housing, 2. Sub-lever, 21. Extension rod, 22. Slot, 3. Female lever, 31. Adjustment cavity, 311. Side cavity, 312. Spring, 32. Locking block, 321. Pushing block, 33. Guide cavity, 34. Slide rail cavity, 4. Push rod, 41. Top groove, 411. Horizontal column, 412. Vertical column, 413. Sub-push surface, 414. Female push surface, 42. Rope groove, 421. Traction rope, 5. Fixed column, 51. Magnet, 52. Elastic clamp, 521. Sub-inclined surface, 522. Female inclined surface, 6. Movable seat, 61. Guide column, 62. Push seat, 63. Bottom cavity, 631. Gravity block, 64. Through cavity, 641. Locking plate. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] See Figure 1-4 The base 1 is equipped with a lever, and a weighing pan 13 and a magnet 14 are respectively installed at both ends of the lever, so that the workpiece can be weighed by weighing the weighing pan 13. The weighing pan 13 and the magnet 14 are existing technologies, so they will not be described in detail.

[0020] A heat sink 12 is installed above the lever, and a PCB board 11 is mounted on top of the heat sink 12. By placing the PCB board 11 on top, it is easy to adjust and maintain the circuit. By setting the metal heat sink 12 at its bottom, heat can be evenly distributed, and the heat sink 12, together with the base 1 and the housing 15, can form a shielding space.

[0021] In this application, all the components of the original electronic balance (lever, weighing pan 13, magnet 14, balance plate, internal calibration unit) are pre-arranged on the base 1, which can reduce the space occupied and achieve miniaturization of the electronic balance. The components of the original electronic balance are all existing technologies, so they will not be described in detail.

[0022] Furthermore, since all parts are fixed on the base 1, it is easy to change the lever ratio by adjusting the relative positions of the parts, thereby dynamically adjusting the weighing capacity, sensitivity, and accuracy. The bottom of the magnet 14 is equipped with a slide rail, which allows the magnet 14 to move laterally on the base 1.

[0023] See Figure 5-7 The lever consists of a sub-lever 2 and a mother lever 3 joined together. By moving the sub-lever 2, the overall length of the lever can be changed, thereby adjusting the leverage ratio. The sub-lever 2 is installed on one side of the magnet 14, and the mother lever 3 is installed on one side of the weighing pan 13.

[0024] One end of the sub-lever 2 is fixedly equipped with an extension rod 21, and the mother lever 3 has an adjustment cavity 31 adapted to the extension rod 21. Both sides of the adjustment cavity 31 are movably equipped with locking blocks 32, and both sides of the extension rod 21 have multiple locking slots 22 that are adapted to and engaged with the locking blocks 32. By engaging the locking blocks 32 in different slots 22, the extension rod 21 can be fixed at different extension lengths, thereby achieving adjustment of the overall length of the lever.

[0025] The magnet 14 is fitted with a push surface 141 corresponding to the push rod 4. The push rod 4 pushes the push surface 141, which can move the magnet 14.

[0026] Both the pushing surface 141 and one end of the push rod 4 have inwardly formed rope grooves 42, and the rope grooves 42 on both sides are connected by a traction rope 421. The traction rope 421 allows the push rod 4 to pull the magnet 14 back to its original position synchronously when it retracts. Furthermore, the traction rope 421 eliminates the need for a rigid connection between the push rod 4 and the magnet 14, ensuring that the push rod 4 does not contact the magnet 14 during the rotation of the lever, thus maintaining the lever's accuracy.

[0027] See Figure 7-19 The mother lever 3 has communicating side cavities 311 on both sides of the adjusting cavity 31. Each locking block 32 is adapted to move within one of these side cavities 311. Multiple springs 312 connect the locking blocks 32 to the inner walls of the side cavities 311. The springs 312 push the locking blocks 32, ensuring they are stably engaged within the slots 22. This engagement between the locking blocks 32 and the slots 22 creates a rigid connection between the daughter lever 2 and the mother lever 3, ensuring stability after adjustment. A guide assembly is provided between the locking blocks 32 and the side cavities 311 to ensure the locking blocks 32 can move laterally within the side cavities 311.

[0028] Each of the locking blocks 32 has a push block 321 installed at the bottom of its part extending from the mother lever 3, and a matching slope is provided between the push block 321 and the push seat 62. Thus, when the push seat 62 moves toward the push block 321, the slope can push the push blocks 321 on both sides outward, thereby driving the locking blocks 32 to move synchronously, thereby releasing the mutual jamming between the locking blocks 32 and the locking slot 22.

[0029] The female lever 3 has a guide cavity 33 at one end, and the top of the movable seat 6 is fixedly provided with a guide post 61 that is adapted to the guide cavity 33. Through the adaptation between the guide cavity 33 and the guide post 61, the movable seat 6 can move laterally stably below the female lever 3.

[0030] The bottom of the main lever 3 has a slide rail cavity 34, and the push rod 4 is adapted to move within the slide rail cavity 34 via an electric slider. Driven by the electric slider, the push rod 4 can move laterally at the bottom of the main lever 3. It is worth noting that both the electric slider and the slide rail are existing technologies, and therefore will not be described in detail.

[0031] The movable base 6 has an upward-facing cavity 63 at its bottom, and a gravity block 631 is vertically movably disposed within the cavity 63. A matching guide and guide groove are provided between the gravity block 631 and the cavity 63, enabling the gravity block 631 to move stably vertically.

[0032] When the gravity block 631 is in the downward position, its bottom is located on the side of the horizontal column 411. This allows the gravity block 631 and the movable seat 6 to move synchronously when the push rod 4 moves the horizontal column 411.

[0033] A magnetic block 51 is fixedly mounted on the fixed column 5. The magnetic block 51 is adapted to the through cavity 64, allowing it to pass through the cavity 64 and move to the top of the gravity block 631. The bottom of the magnetic block 51 is made of magnetic material, and the top of the gravity block 631 is also made of magnetic material. When the magnetic block 51 moves to the top of the gravity block 631, the gravity block 631 can be attracted upward by magnetic attraction. At this time, the bottom of the gravity block 631 is located above the horizontal column 411. When the horizontal column 411 moves synchronously with the push rod 4, it will not cause the movable seat 6 to move.

[0034] The movable seat 6 has a through cavity 64 on one side of the bottom cavity 63, and clamping plates 641 are provided on both sides below the through cavity 64. Multiple elastic clamping elements 52 adapted to the clamping plates 641 are fixedly provided at the bottom of the fixed post 5. When the movable seat 6 moves to the side of the fixed post 5, the movable seat 6 can be fixed by the adaptation and locking between the elastic clamping elements 52 and the clamping plates 641.

[0035] Each elastic clip 52 is provided with a sub-sloping surface 521 and a female sloping surface 522. Two uprights 412 are fixedly installed above each horizontal column 411. Each upright 412 is provided with a sub-push surface 413 corresponding to the sub-sloping surface 521, and each upright 412 is provided with a female push surface 414 corresponding to the female sloping surface 522.

[0036] When the sub-push surface 413 contacts the sub-inclined surface 521, the sub-push surface 413 can push the sub-inclined surface 521, causing the elastic locking member 52 to deform, thus releasing the mutual locking between the elastic locking member 52 and the locking plate 641. Similarly, when the female push surface 414 contacts the female inclined surface 522, the mutual locking between the elastic locking member 52 and the locking plate 641 can also be released.

[0037] Both the movable seat 6 and the gravity block 631 have corresponding cavities for the uprights 412, allowing the uprights 412 to pass through them.

[0038] In this embodiment, by adjusting the position of the magnet 14 and the length of the lever, the lever ratio can be changed, thereby dynamically adjusting the weighing capacity, sensitivity, and accuracy.

[0039] Furthermore, when changing the lever ratio, simply moving the push rod 4 will push the magnet 14 to move, and during the movement of the magnet 14, it will drive the sub-lever 2 to move, thereby achieving the adjustment of the lever length.

[0040] Example 1: During the adjustment of elongation, the push rod 4 first retracts inward by a portion via the electric slider. At this time, during the retraction of the push rod 4, the horizontal column 411 on the push rod 4 can pull the gravity block 631 and the movable seat 6 to move inward synchronously.

[0041] When the movable seat 6 moves to the side of the fixed post 5, the elastic clip 52 on the fixed post 5 automatically engages with the clip plate 641, thus fixing the movable seat 6. At this time, the magnetic block 51 on the fixed post 5 extends into the bottom cavity 63, and the gravity block 631 is attracted upwards by the magnetic block 51 through magnetic attraction. This fixes the movable seat 6 to the fixed post 5, preventing it from changing position using the push rod 4.

[0042] As the movable seat 6 moves inward, the push seats 62 on both sides can push the push block 321, causing the locking blocks 32 on both sides to move outward. At this time, the springs 312 are compressed. This releases the mutual jamming between the locking blocks 32 and the locking slots 22, thus realizing the movement adjustment of the lever 2.

[0043] Subsequently, push rod 4 extends outward via electric slider, thereby pushing the push surface 141 of magnet 14 to move magnet 14 outward. During the outward movement of magnet 14, sub-lever 2 moves synchronously, at which point extension rod 21 is partially withdrawn from adjustment cavity 31.

[0044] Each horizontal column 411 is equipped with two vertical columns 412. As the push rod 4 moves the horizontal column 411 outward, the movable seat 6 will pass through the vertical column 412 on the same side after passing through one horizontal column 411. At this time, the female push surface 414 on the vertical column 412 will contact the female inclined surface 522, thereby pushing the female inclined surface 522 through the female push surface 414. At this time, the elastic locking member 52 will deform, thereby releasing the mutual locking between the elastic locking member 52 and the locking plate 641.

[0045] Silicone pads are provided on the sides of the upright column 412 to increase its friction. This allows the elastic clip 52 and the locking plate 641 to release their mutual locking. Through the friction between the upright column 412 and the movable seat 6, the movable seat 6 can move outward synchronously with the upright column 412 for a certain distance. This ensures that the elastic clip 52 and the locking plate 641 will not lock together again after being released from mutual locking, and the gravity block 631 will fall down again due to gravity. Until the movable seat 6 moves to its outermost position, it is restricted by the guide post 61 and cannot move further. At this point, the upright column 412 can pass through the movable seat 6.

[0046] As the push rod 4 pushes the magnet 14 and the sub-lever 2 outward, when the locking block 32 contacts the next locking slot 22 on the extension rod 21, the locking block 32 can automatically reset to the next locking slot 22 by the elastic force of the spring 312, thereby realizing the re-fixation between the sub-lever 2 and the mother lever 3. At this time, the total length of the lever is stretched.

[0047] After the locking block 32 and the locking slot 22 are engaged, the push rod 4 is then controlled to retract slightly inward via the electric slider, so that the next horizontal column 411 in the top slot 41 moves to the movable seat 6 and contacts it. This ensures that the push rod 4 and the magnet 14 maintain a distance after adjustment, thus preventing interference during lever rotation.

[0048] Furthermore, when it is necessary to extend the lever again, simply repeat the above steps. Each time the above steps are repeated, the lever will be extended by a fixed distance, and the magnet 14 will also be pushed outward by a fixed distance. The number of segments of the horizontal column 411 is the same as the number of segments of the slot 22, ensuring that the movable seat 6 can secure the locking block 32 within the downward-moving slot 22 each time it passes through a segment of the horizontal column 411.

[0049] Since the adjustment distance of the lever and the movement distance of the magnet 14 are fixed during each adjustment, the spacing between the slot 22 and the crossbar 411 can be set according to the required lever ratio during the fabrication of this device to ensure that the lever ratio is appropriate after each adjustment. Furthermore, in this application, adjustment is achieved through an electric slider on the push rod 4, and the electric slider moves a preset distance each time, eliminating the need for manual adjustment by the user.

[0050] Example 2: When it is necessary to shorten the lever, simply control the push rod 4 to retract inward via the electric slider. During the retraction process, the horizontal bar 411 on the push rod 4 pulls the gravity block 631 and the movable seat 6 to move inward synchronously. Then, the movable seat 6 is fixed again by the mutual locking of the elastic clip 52 and the clip plate 641, and the gravity block 631 is attracted upward by the magnetic block 51.

[0051] This releases the mutual jamming between the locking block 32 and the locking slot 22. The push rod 4 then continues to retract, pulling the magnet 14 inward via the traction rope 421. The magnet 14 then drives the sub-lever 2 and the extension rod 21 to move inward synchronously, thus shortening the lever length. When the column 412 passes through the elastic locking member 52, the sub-push surface 413 on the column 412 pushes the sub-inclined surface 521, causing the elastic locking member 52 to deform. Therefore, the column 412 can pass through the side of the elastic locking member 52. Since the movable seat 6 is already at its innermost position and the column 412 is not moving inward, it cannot push the movable seat 6 at this time, but instead passes through the middle. Once the column 412 has passed through, the elastic locking member 52 resets directly through its elastic force and re-locks with the locking plate 641.

[0052] When the push rod 4 retracts inward to a sufficient distance, simply repeat the latter half of the steps in Example 1 to lock the locking block 32 and the locking slot 22 together and reset the movable seat 6. At this point, the reduction and adjustment of the lever length can be achieved.

[0053] Furthermore, this device is equipped with a variety of sensors from existing technologies to monitor the positions of moving parts such as magnet 14, push rod 4, and movable seat 6, thereby improving their adjustment accuracy.

[0054] The slide rail in this application is equipped with multiple damping mechanisms, each of which corresponds to the length of the magnet 14 and the lever after adjustment, in order to further improve its stability after adjustment.

[0055] In this invention, the weighing of workpieces can be achieved through the matching arrangement between the lever, weighing pan 13 and magnet 14. The splicing design of the sub-lever 2 and the mother lever 3, combined with the structure of the push rod 4 driving the magnet 14 to move, allows for discrete and rigid adjustment of the lever length, thereby achieving adjustment of the lever ratio to adapt to different weighing ranges. Furthermore, all components in this device are arranged laterally on the base 1 to reduce the size of the device.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A miniature electromagnetic weighing device, comprising a base (1), wherein a telescopically adjustable lever is provided on the base (1), and a weighing pan (13) and a movable magnet (14) are respectively provided at both ends of the lever, characterized in that: The lever is composed of a sub-lever (2) and a mother lever (3) spliced ​​together. An extension rod (21) is fixedly provided at the end of the sub-lever (2). An adjustment cavity (31) is adapted to the extension rod (21) on the mother lever (3). Both sides of the adjustment cavity (31) are movably provided with a locking block (32) for locking the extension rod (21). The mother lever (3) is movably provided with a push rod (4) for pushing the magnet (14) below it. The top of the push rod (4) is provided with a top groove (41), and multiple horizontal columns (411) and vertical columns (412) are fixedly provided in the top groove (41). One end of the mother lever (3) is located above the push rod (4) and a movable seat (6) is provided. Both sides of the movable seat (6) are fixedly provided with push seats (62) for unlocking the card block (32), and a gravity block (631) adapted to the horizontal column (411) is vertically movable inside the movable seat (6). The bottom of the mother lever (3) is located behind the movable seat (6) and is fixedly provided with a magnetic block (51) for adsorbing the gravity block (631) by a fixed post (5). The bottom of the fixed post (5) is provided with multiple elastic clips (52) for locking the movable seat (6).

2. The miniature electromagnetic force weighing device according to claim 1, characterized in that, A PCB board (11) and a heat sink (12) are mounted on the base (1) above the magnet (14) and the lever, and a housing (15) is mounted on the outside of the base (1).

3. A miniature electromagnetic force weighing device according to claim 1, characterized in that, The sub-lever (2) is installed on one side of the magnet (14), and multiple slots (22) adapted to the locking block (32) are provided on both sides of the extension rod (21), and a push surface (141) is provided on the magnet (14) to adapt to the push rod (4).

4. A miniature electromagnetic force weighing device according to claim 3, characterized in that, The push surface (141) and one end of the push rod (4) are both provided with rope grooves (42) facing inward, and the rope grooves (42) on both sides are connected by a traction rope (421).

5. A miniature electromagnetic force weighing device according to claim 1, characterized in that, The mother lever (3) has a connected side cavity (311) on both sides of the adjustment cavity (31). The locking blocks (32) are adapted to move in the side cavity (311). The locking blocks (32) and the inner wall of the side cavity (311) are connected by multiple springs (312). The bottom of the locking blocks (32) extends out from the mother lever (3) and is equipped with a push block (321). A suitable slope is provided between the push block (321) and the push seat (62).

6. A miniature electromagnetic force weighing device according to claim 1, characterized in that, One end of the mother lever (3) is provided with a guide cavity (33), the top of the movable seat (6) is fixedly provided with a guide post (61) adapted to the guide cavity (33), the bottom of the mother lever (3) is provided with a slide rail cavity (34), and the push rod (4) is adapted to move in the slide rail cavity (34) by an electric slider.

7. A miniature electromagnetic force weighing device according to claim 1, characterized in that, The bottom of the movable seat (6) is provided with a bottom cavity (63) facing upward. A gravity block (631) is vertically and movably arranged in the bottom cavity (63). A through cavity (64) is provided on one side of the bottom cavity (63) on the movable seat (6), and a card plate (641) is provided on both sides below the through cavity (64).

8. A miniature electromagnetic force weighing device according to claim 7, characterized in that, A magnetic block (51) is fixedly installed on the fixed column (5). The magnetic block (51) is adapted to the cavity (64). The top of the gravity block (631) is made of magnetic material and is adapted to attract the magnetic block (51).

9. A miniature electromagnetic force weighing device according to claim 7, characterized in that, The bottom of the fixed column (5) is fixedly provided with multiple elastic clips (52) adapted to the card plate (641), and each elastic clip (52) is provided with a sub-slope (521) and a mother slope (522).

10. A miniature electromagnetic force weighing device according to claim 9, characterized in that, Two columns (412) are fixedly installed above each of the horizontal columns (411). Each column (412) has a sub-push surface (413) adapted to the sub-sloping surface (521), and each column (412) has a mother push surface (414) adapted to the mother slope (522).

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