CN112312758A - Balance jig and fixing device - Google Patents

Abstract

The invention discloses a balance jig and a fixing device, which belong to the technical field of product assembly. The balance fixture and the fixing device provided by the invention adopt the principle that the self weight is combined with the eccentric gravity center to keep balance, and the stability of the element to be balanced is kept through the external force of the free falling body, so that the structural limitation is reduced in the product design, the technical bottleneck that the traditional SIP element design needs a middle rule is broken through, and the realization possibility is provided for the unconventional SIP element design.

Description

Balance jig and fixing device

Technical Field

The invention relates to the technical field of product assembly, in particular to a balance jig and a fixing device.

Background

In the assembly process of electronic products, the connection mode between two components usually includes bonding, welding and other modes, and irregularly shaped components usually exist in the components, for example, a protrusion is arranged at a position near one end in the middle of the bottom of the component, and the whole component inclines towards the other end due to the problem of gravity center, so that the welding area inclines and upwarps to form a welding problem, and the yield cannot meet the requirement of mass production. For example, in the current SMT factory, a top weight is basically used for pressing non-ball grid array soldered components with a deviated center of gravity and unbalanced bottoms, but the non-ball grid array soldered components are not well formed due to falling of the non-ball grid array soldered components caused by vibration during operation of product equipment; no company has attempted to design such ball grid array components in a bottom unbalanced manner, all of which have a uniform height or regular shape. That is, in order to avoid the design with the center of gravity deviated and the bottom unbalanced, the design of the components of the prior art is usually performed in a manner of a medium moment to achieve the purpose of keeping the bottom at a uniform height or in a regular shape, which causes limitations in product design, for example, the functional design of the components cannot be dominant. However, as SIP device designs have been developed, some manufacturers have developed the requirement of functional design-dominated, profile design-sparing functions, which results in the device creating technological bottlenecks in the manufacturing process, which cannot be overcome by the conventional manufacturing method, and the technological bottlenecks include concavity on the bonding surface, deviation of the bottom gravity center, and non-planar surface of the profile of the device body region. Therefore, it is a technical problem to improve the manufacturing process of the design of the unbalanced-bottom device with the deviated center of gravity.

Disclosure of Invention

The invention aims to provide a balance jig and a fixing device, which adopt the principle that the self weight is combined with the eccentric center of gravity to keep balance, and keep the stability of an element to be balanced through the external force of a free falling body; in the product design, the structural limitation is reduced, the technical bottleneck that the SIP element design must be in the middle rule at present is broken through, and the realization possibility is provided for the non-conventional SIP element design.

As the conception, the technical scheme adopted by the invention is as follows:

a balancing fixture, comprising:

the supporting plate is provided with a first through hole;

the supporting legs are fixed at the bottom of the supporting plate;

the gravity pressure head is arranged in the first through hole in a penetrating mode, the supporting plate limits the height of the gravity pressure head through the supporting legs, and the gravity pressure head can be pressed at a preset position of an element to be balanced in a free-falling state;

and the suspension piece is fixed on the gravity pressure head, and the gravity pressure head is suspended in the first through hole of the supporting plate through the suspension piece.

Optionally, the gravity head further comprises a limiting part, the limiting part is connected to the supporting plate, a limiting hole is formed in the limiting part, the top end of the gravity head is movably arranged in the limiting hole in a penetrating mode, and the limiting part limits the rotation of the gravity head through the limiting hole.

Optionally, the locating part is equipped with a plurality ofly, every be equipped with on the locating part a plurality ofly spacing hole, the gravity pressure head is equipped with a plurality ofly, and is a plurality of the gravity pressure head is with a plurality of spacing hole one-to-one, just the top activity of gravity pressure head is worn to locate its correspondence in the spacing hole.

Optionally, still be equipped with on the locating part communicate in the access hole in spacing hole, the pendant is for running through the member of gravity pressure head, the one end of member stretches into in the access hole.

Optionally, the outer side of the bottom end of the gravity pressure head or the outer side of the bottom end of the gravity pressure head close to the bottom end is provided with a flange ring, and a protrusion is formed on the end face of the bottom end of the gravity pressure head.

Optionally, the supporting legs are long and two, and the two supporting legs are oppositely arranged at two ends of the supporting plate.

The utility model provides a fixing device, includes loading board, magnetism steel sheet and foretell balanced tool, the backup pad passes through the supporting legs set up in on the loading board, the magnetism steel sheet set up in the loading board moves towards balanced tool one side, passes through with the circuit board of treating that balanced component is connected the magnetism steel sheet location is in on the loading board, just be formed with on the magnetism steel sheet dodge and spacing treat the through-hole of balanced component.

Optionally, the magnetic steel sheet is connected with the bearing plate in a magnetic attraction manner.

Optionally, the fixing device further includes a positioning column, a positioning hole corresponding to the positioning column is formed in the bearing plate, one end of the positioning column is fixedly connected to the supporting leg, the other end of the positioning column penetrates through the positioning hole, and the end portion of the positioning column is conical.

Optionally, a hollow hole for heat dissipation or maintenance is formed in the supporting plate, and the bearing plate is provided with a heat dissipation hole.

The invention has at least the following beneficial effects:

in the balancing jig provided by the invention, the gravity pressure head is movably arranged in the first through hole on the supporting plate in a penetrating way and can be pressed at the preset position of the element to be balanced in a free-falling state, so that the effect of accurate balance can be achieved, namely, the weight of the gravity pressure head is designed according to the inclination degree of the element to be balanced, the element to be balanced is in a balanced state by accurately adjusting the end with lighter weight of the element to be balanced, the distance between the element to be balanced and the element to be welded in a welding area is ensured to meet the welding requirement, the probability of poor welding is reduced, and the yield of products is improved. And, through setting up the pendant, prevented that the gravity pressure head from following roll-off in the first through-hole, the removal and the transportation of balanced tool of being convenient for. The balance fixture adopts the principle of self weight combined with eccentric gravity center to keep balance, keeps the stability of the element to be balanced through the external force of free falling, reduces the structural limitation in the product design, breaks through the technical bottleneck that the prior SIP element design must have a middle specification and a middle moment, and provides the realization possibility for the unconventional SIP element design.

The fixing device provided by the invention mainly comprises a balance jig, a magnetic steel sheet and a bearing plate, wherein the magnetic steel sheet is used for positioning a plurality of elements to be balanced and circuit boards welded with the elements to be balanced on the bearing plate, the balance jig is assembled on the bearing plate through supporting legs, and a gravity pressure head arranged on the balance jig can adjust the gravity center of the elements to be balanced, so that the heights between the elements to be balanced and the circuit boards to be welded are kept at the same relative distance, the working efficiency is improved, and the processing consistency of products is improved.

Drawings

FIG. 1 is a schematic structural diagram of a fixing device provided in an embodiment of the present invention;

FIG. 2 is an exploded view of a fixing device according to an embodiment of the present invention;

FIG. 3 is a front view of a fixture provided by an embodiment of the present invention;

FIG. 4 is a top view of a gravity ram, a suspension member, and a position-limiting member according to an embodiment of the present invention;

FIG. 5 is a top view of a fixture according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view A-A of the present invention as shown in FIG. 5;

FIG. 7 is a cross-sectional view B-B of the present invention as shown in FIG. 5;

FIG. 8 is a schematic diagram of a gravity head according to an embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view of a fixation device provided in accordance with an embodiment of the present invention in use;

FIG. 10 is an enlarged schematic view of the invention at position C shown in FIG. 9;

in the figure:

1. a support plate; 11. a first through hole; 12. hollowing out holes; 2. a gravity head; 21. a top end; 211. a limiting plane; 22. a flange ring; 23. a protrusion; 3. a suspension member; 4. a limiting member; 41. a limiting hole; 42. an access hole; 5. a positioning column; 51. an end portion; 6. supporting legs; 7. a set screw;

10. a carrier plate; 101. heat dissipation holes; 20. balancing the jig; 30. a magnetic steel sheet; 301. a through hole; 40. an element to be balanced; 401. a raised portion.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present embodiment provides a balancing fixture 20, which can be applied in a fixing device for fixing an element to be balanced 40, so as to prevent the element to be balanced 40 from being unbalanced.

As shown in fig. 1 to 10, the balancing fixture 20 includes a supporting plate 1, a supporting foot 6, a gravity head 2 and a suspension member 3.

Wherein, be equipped with first through-hole 11 on the backup pad 1, first through-hole 11 runs through the upper and lower both sides of backup pad 1. The support legs 6 are fixed to the bottom of the support plate 1 and serve to support the support plate 1. The gravity pressure head 2 is movably arranged in the first through hole 11 in a penetrating mode, the supporting plate 1 limits the height of the gravity pressure head 2 through the supporting legs 6, and the gravity pressure head 2 can be pressed at a preset position of the element to be balanced 40 in a free-falling state. That is, the height of the gravity ram 2 needs to be matched with the height of the supporting foot 6, so that the gravity ram 2 can meet both the requirement of being located in the first through hole 11 and the requirement of being pressed on the element to be balanced 40 in a free-falling state. It should be noted that the upper half portion of the gravity head 2 is inserted into the first through hole 11, and the lower half portion of the gravity head 2 is located outside the first through hole 11. It should be noted that, as shown in fig. 10, the preset position of the member to be balanced 40 is biased toward the end of the member to be balanced 40 with a light weight, with the boss portion 401 of the member to be balanced 40 as a fulcrum.

As shown in fig. 2, the hanging member 3 is fixed on the gravity head 2, and the gravity head 2 is hung in the first through hole 11 of the supporting plate 1 through the hanging member 3, so as to combine the gravity head 2 with the supporting plate 1, prevent the gravity head 2 from separating from the first through hole 11, and facilitate the movement and transportation of the balancing fixture 20. It should be noted that the pressure applied to the component to be balanced 40 is the sum of the gravity ram 1 and the gravity of the suspension member 3, and the sum of the gravity ram 1 and the gravity of the suspension member 3 needs to be designed according to the performance of the component to be balanced 40, and the gravity design is determined according to the inclination degree of the product, so as to achieve the purpose of accurate weighting, so that the component to be balanced 40 is in a balanced state, and the distance between the component to be balanced 40 in the soldering area and the circuit board meets the soldering requirement. Illustratively, when the element to be balanced 40 is a SIP element, the weight of the gravity head 2 is 5 g.

In the balance fixture 20 that this embodiment provided, the activity of gravity pressure head 2 is worn to locate in the first through-hole 11 in backup pad 1, and can press the preset position of treating balance element 40 with the free fall state, thereby treat balance element 40's focus and adjust, the tip that has prevented to treat balance element 40 takes place the condition that the slope upwarps, guaranteed to treat balance element 40 and the smooth welding of circuit board, the bad probability of welding has been reduced to appear, the yield that includes this electronic product of treating balance element 40 has been improved. And, through setting up hanger 3, prevented that gravity pressure head 2 from following first through-hole 11 roll-off, be convenient for balanced tool 20's removal and transportation. In addition, compared with the prior art, the balance fixture 20 provided in the embodiment further has the following advantages:

first, the balance fixture 20 provided by this embodiment limits the gravity head 2 in the horizontal direction through the inner wall of the first through hole 11, and suspends the gravity head 2 in the first through hole 11 through the suspension member 3, so as to realize the limitation on the gravity head 2 in the vertical direction, so that the gravity head 2 does not fall off when the product equipment vibrates, and therefore, the balance fixture has high reliability.

Secondly, the balance tool 20 that this embodiment provided adopts the dead weight to combine the eccentric center of gravity to keep the balanced principle, can rely on gravity pressure head 2 dead weight increase and decrease mode to adjust according to component balancing force demand size, gives accurate unanimous weight. The contour dimension precision and the weight error of the gravity pressure head 2 can be ensured to be high and consistent; the gravity pressure head 2 cannot generate risk change along with the change of time or working environment, and the quality stability is extremely high; and the standard of the mode is easy to establish, and the consistency check can be realized.

Thirdly, the design principle of the balance fixture 20 provided by this embodiment does not need a circuit board for compensation, so that the limitation of a short board of material can be avoided, thereby expanding the application window of the manufacturing process, and breaking through the technical bottleneck that the conventional SIP element design must have a medium specification, so that the structure of the SIP element can be adaptively improved under the condition of being adapted to the functional requirements, thereby providing the possibility of implementation for the unconventional SIP element design.

And, through setting up hanger 3, prevented that gravity pressure head 2 from following first through-hole 11 roll-off, be convenient for balanced tool 20's removal and transportation.

In this embodiment, as shown in fig. 2, the two supporting legs 6 are elongated and are disposed, and the two supporting legs 6 are disposed at two ends of the supporting plate 1, so as to improve the stability of the supporting legs 6 for supporting the supporting plate 1, and also prevent the supporting legs 6 from occupying a functional area of the supporting plate 1, where the functional area of the supporting plate 1 is an area where the first through hole 11 can be formed. In addition, the arrangement of the two supporting members 6 can also be used for preventing the deformation of the supporting plate 1, namely, the strength of the supporting plate 1 is increased, and the situation that the supporting plate 1 is deformed due to excessive hole opening is prevented.

Alternatively, the arrangement of the hanging member 3 may be various, and the present embodiment provides the following ways.

In an arrangement manner of the hanging member 3, referring to fig. 7, a through hole is formed on the gravity head 2, the hanging member 3 is inserted and fixed in the through hole, and at least one end of the hanging member 3 protrudes from the gravity head 2. That is, the hanging member 3 is a rod member penetrating through the gravity head 2, and when the gravity head 2 is inserted into the first through hole 11, an end of the rod member is hung outside the first through hole 11.

In another arrangement of the suspension member 3, the suspension member 3 is fixed to a side wall of the gravity head 2 and extends outward. When the gravity pressure head 2 is inserted into the first through hole 11, the hanging piece 3 is hung outside the first through hole 11.

The suspending members 3 having both of the above-described structures have a function of suspending the gravity head 2 on the first through hole 11.

Optionally, the gravity head 2 may be provided with one or more suspension members 3, which is not limited in this embodiment, and when the gravity head 2 is provided with a plurality of suspension members 3, the plurality of suspension members 3 are arranged along the circumference of the gravity head 2.

In this embodiment, as shown in fig. 2, the balancing fixture 20 may further include a limiting member 4. The limiting member 4 is detachably connected to the supporting plate 1, and illustratively, the limiting member 4 is connected to the supporting plate 1 through a fixing screw 7. And, be equipped with spacing hole 41 on the locating part 4, spacing hole 41 corresponds to the first through-hole 11 on the backup pad 1, and the top activity of gravity pressure head 2 is worn to locate in spacing hole 41, that is, there is the gap between spacing hole 41 and the gravity pressure head 2, or the frictional force between spacing hole 41 and the gravity pressure head 2 is less than the gravity of gravity pressure head 2 self far away for gravity pressure head 2 can also be pressed at preset position with the free fall state, locating part 4 is used for through spacing hole 41 restriction gravity pressure head 2 for the rotation of locating part 4. It should be noted that the suspension member 3 can slide freely in the position-limiting hole 41 without being limited by the position-limiting hole 41.

Further, the lateral wall at the top end of gravity pressure head 2 has anti-rotation plane, and spacing hole 41 has the anti-rotation inner wall that is the plane, and the anti-rotation inner wall is on a parallel with anti-rotation plane, and the distance between the two is less than preset distance, and perhaps, the anti-rotation inner wall can laminate with anti-rotation plane mutually for gravity pressure head 2 can be by better spacing in spacing hole 41. It should be noted that a plurality of anti-rotation planes may be disposed on the weight ram 2, the limiting hole 41 has a plurality of anti-rotation inner walls corresponding to the plurality of anti-rotation planes to reduce the possibility of rotation of the weight ram 2, and the suspension member 3 is fixed on the sidewall of the weight ram 2 not having the anti-rotation planes. Illustratively, the predetermined distance may be 0.05 mm in order to ensure that the gravity ram 2 is free to move in the position-limiting hole 41.

Optionally, as shown in fig. 5, the limiting members 4 may be provided in plurality, and each limiting member 4 may be provided with a plurality of limiting holes 41, correspondingly, the first through hole 11 is also provided in plurality corresponding to the limiting holes 41, the gravity head 2 is provided in plurality, the gravity heads 2 correspond to the limiting holes 41 one by one, and the top end of the gravity head 2 is movably inserted into the corresponding limiting hole 41, the balancing fixture 20 with the gravity heads 2 may balance a plurality of components 10 to be balanced at the same time, when being welded to a corresponding circuit board, it may be ensured that heights of the components 10 to be balanced are maintained at the same relative distance, and it is ensured that the distance is fixed, and when improving the working efficiency, the consistency of the components 10 to be balanced and the product processing is improved.

Optionally, as shown in fig. 4, the limiting member 4 is further provided with an access hole 42 communicated with the limiting hole 41, and the access hole 42 is used for inspection and maintenance of the balancing jig 20, for example, the abrasion condition of the balancing jig 20 can be inspected. When the suspension member 3 is a rod member extending through a gravity head, one end of the rod member can extend into the access opening 42.

In this embodiment, as shown in fig. 8, the flange ring 22 is disposed on the outer side of the bottom end of the gravity head 2 or the outer side of the gravity head 2 close to the bottom end, so that the overall structure of the gravity head 2 is in a shape of small top and large bottom, and the gravity head 2 can be moved down, thereby facilitating the gravity head 2 to fall under its own weight and avoiding the gravity head 2 from being skewed and jammed. Alternatively, the flange ring 22 and the gravity head 2 may be of one-piece construction. Fig. 8 is a schematic view of the outside of the bottom end of the gravity head 2 provided with a flange ring 22.

Further, a protrusion 23 is formed on the end surface of the bottom end of the gravity ram 2, the protrusion 23 is in contact with the element to be balanced 40, and the size of the protrusion 23 is smaller than that of the bottom end of the gravity ram 2, so that the gravity ram 2 can be more accurately pressed at the preset position. In addition, the surface of the protrusion 23 contacting the preset position may be an arc-shaped protrusion surface to prevent the protrusion 23 from scratching the member to be balanced 40.

The embodiment further provides a fixing device, as shown in fig. 1 and fig. 2, the fixing device includes a bearing plate 10, a magnetic steel sheet 30 and the above-mentioned balance fixture 20. The supporting plate 1 is arranged on the bearing plate 10 through the supporting legs 6, the magnetic steel sheet 30 is arranged on one side of the bearing plate 10 facing the balance fixture 20, the circuit board connected with the element 40 to be balanced is positioned on the bearing plate 10 through the magnetic steel sheet 30, a through hole 301 which avoids and limits the element 40 to be balanced is formed in the magnetic steel sheet 30, and the shape of the through hole 301 is the same as that of the element 40 to be balanced.

The fixing device provided by the invention mainly comprises a balance jig 20, a magnetic steel sheet 30 and a bearing plate 10, wherein the magnetic steel sheet 30 is used for positioning a plurality of elements 40 to be balanced and circuit boards welded with the elements on the bearing plate 10, the balance jig 20 is assembled on the bearing plate 10 through supporting legs 6, and a gravity pressure head 2 arranged on the balance jig can adjust the gravity center of the elements 40 to be balanced, so that the heights of the elements 40 to be balanced and the circuit boards to be welded are kept at the same relative distance, and the working efficiency is improved while the consistency of product processing is improved. The present embodiment has a significant difference from the single-body correction method adopted in the current SMT operation, and the present embodiment forms a stable mode by pressing multiple groups of components 40 to be balanced, thereby avoiding instability in the original single-body pressing correction process. In the specific implementation, the balancing fixture 20 is loaded on the loading board 10 of a plurality of products waiting for standing, so as to complete the balancing action of the plurality of components 40 to be balanced, thereby ensuring the invariance of the components in the next fixing process.

Optionally, the magnetic steel sheet 30 is connected with the bearing plate 10 in a magnetic attraction manner to position the magnetic steel sheet 30 on the bearing plate 10, and the magnetic steel sheet is used for positioning the circuit board and limiting the to-be-balanced element 40.

Further, with reference to fig. 2, in order to realize the precise matching between the supporting legs 6 and the supporting plate 10, the fixing device further includes a positioning column 5. The bearing plate 10 is provided with a positioning hole corresponding to the positioning column 5, one end of the positioning column 5 is fixedly connected to the supporting leg 6, and the other end of the positioning column 5 penetrates through the positioning hole, so that the supporting leg 6 and the bearing plate 10 are accurately matched. Moreover, the end part 51 of the positioning column 5 is conical, and the end part 51 of the positioning column 5 is arranged in a conical mode, so that accurate and rapid assembly among multiple components is easily formed, and the purpose of pressing design is fully guaranteed. Preferably, the position selectable range of the positioning columns is increased on the bearing plate 10 and the supporting legs 6, so that the fool-proof design of the matching of the supporting plate 1 and the bearing plate 10 is easier to realize.

Optionally, as shown in fig. 2, a hollow hole 12 for heat dissipation or maintenance is formed in the supporting plate 1, and a heat dissipation hole 101 is formed in the bearing plate 10, so that reflow soldering hot air can be convected to the balancing component 40, a relatively uniform heating effect can be formed, and poor welding of the balancing component 40 due to the balancing fixture 20 with a large loading heat absorption capacity can be prevented. Meanwhile, the arrangement of the hollow holes 12 and the heat dissipation holes 101 is convenient for on-line detection, so that the abnormal problem of automatic alarm can be seen, the fixing device does not need to be detached, and the quality hidden danger caused by artificial interference is reduced.

In the balance fixture 20 and the fixing device provided by this embodiment, the principle of self-weight combined with eccentric center of gravity to maintain balance is adopted, and the stability of the component 40 to be balanced is maintained through the external force of free falling body, so as to perfectly overcome the defects of the production process, avoid the failure of reworking of long-term design results, even the failure of design application to actual production, and make the yield of the component 40 to be balanced after welding directly reach the level of more than 99.95%. The appearance of the design concept of the balance jig 20 breaks through the design concept of the old jig, thereby breaking through the bottleneck in the design. In the design of the product facing exclusively cooperating elements, the structural limitations are reduced. The design concept of the balance jig 20 brings about the updating of the design concept of the jig of the SIP system, creates a new design and application platform for a more severe design environment, and lays a solid foundation for the subsequent shortening of the development period of a new product. The jig provided by the invention is designed to provide a basic guarantee for automatic operation, lays a foundation for development from 'manufacturing' to 'intelligent manufacturing', and improves the price advantage of a single product while stabilizing quality, improving productivity and efficiency and saving cost, thereby having stronger competitive speaking right.

The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A balancing jig, comprising:

the supporting plate (1), wherein a first through hole (11) is formed in the supporting plate (1);

the supporting legs (6) are fixed at the bottom of the supporting plate (1);

the gravity pressure head (2) is arranged in the first through hole (11) in a penetrating mode, the supporting plate (1) limits the height of the gravity pressure head (2) through the supporting legs (6), and the gravity pressure head (2) can be pressed at a preset position of an element to be balanced in a free-falling state;

a hanging piece (3) fixed on the gravity pressure head (2), wherein the gravity pressure head (2) is hung in the first through hole (11) of the supporting plate (1) through the hanging piece (3).

2. The balancing fixture according to claim 1, further comprising a limiting member (4), wherein the limiting member (4) is connected to the support plate (1), a limiting hole (41) is formed in the limiting member (4), the top end of the gravity head (2) is movably inserted into the limiting hole (41), and the limiting member (4) limits the rotation of the gravity head (2) through the limiting hole (41).

3. The balancing fixture according to claim 2, wherein a plurality of limiting members (4) are provided, a plurality of limiting holes (41) are provided on each limiting member (4), a plurality of gravity pressing heads (2) are provided, the gravity pressing heads (2) correspond to the limiting holes (41) one by one, and the top ends of the gravity pressing heads (2) are movably inserted into the corresponding limiting holes (41).

4. The balancing fixture according to claim 3, wherein the position-limiting member (4) is further provided with an access hole (42) communicated with the position-limiting hole (41), the hanging member (3) is a rod member penetrating through the gravity head (2), and one end of the rod member extends into the access hole (42).

5. The balancing fixture according to claim 1, characterized in that a flange ring (22) is provided on the outside of the bottom end of the gravity head (2) or on the outside of the gravity head (2) near the bottom end, and a protrusion (23) is formed on the end surface of the bottom end of the gravity head (2).

6. A balancing jig according to claim 1, characterized in that the supporting feet (6) are long and provided with two, and the two supporting feet (6) are oppositely arranged at two ends of the supporting plate (1).

7. A fixing device is characterized by comprising a bearing plate (10), a magnetic steel sheet (30) and the balance fixture of any one of claims 1 to 6, wherein the supporting plate (1) is arranged on the bearing plate (10) through the supporting legs (6), the magnetic steel sheet (30) is arranged on one side of the bearing plate (10) facing the balance fixture, a circuit board connected with a to-be-balanced element is positioned on the bearing plate (10) through the magnetic steel sheet (30), and a through hole (301) which avoids and limits the to-be-balanced element is formed in the magnetic steel sheet (30).

8. A fixture according to claim 7, characterised in that the magnetic steel sheet (30) is magnetically attached to the carrier plate (10).

9. The fixing device according to claim 7, further comprising a positioning column (5), wherein a positioning hole corresponding to the positioning column (5) is formed on the bearing plate (10), one end of the positioning column (5) is fixedly connected to the supporting foot (6), the other end of the positioning column (5) is inserted into the positioning hole, and an end portion of the positioning column (5) is conical.

10. The fixing device according to claim 7, wherein the supporting plate (1) is provided with a hollow hole (12) for heat dissipation or maintenance, and the bearing plate (10) is provided with a heat dissipation hole (101).

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