A hanger device of a vacuum coating machine

CN224812625UActive Publication Date: 2026-09-29GUANGDONG PANTONE METAL TECH CO LTD
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Patent Information

Application Number
CN202522250037.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-10-24
Publication Date
2026-09-29
Estimated Expiration
2035-10-24

AI Technical Summary

Technical Problem

操作人员需要反复进行穿孔、缠绕、拧紧等步骤,劳动强度大;另外,铁丝两端通常存在尖锐的断口,在用力缠绕和拆卸的过程中,操作人员的手部非常容易被这些锋利的铁丝端头划伤、刺伤

Benefits of technology

1.本实用新型通过设置插销、限位头、限位套、锁舌和弹簧,操作人员将钢板移动到圆形架,使钢板的通孔与插销对准,使插销插入钢板的通孔内,接着,将限位套与插销上的限位头对接,锁舌移动通过限位头时弹簧压缩,锁舌通过限位头后,锁舌能够抵接限位头的侧端,使得限位套不能脱离插销,从而,使得限位套能够阻止钢板脱离插销,避免圆形架运行过程钢板脱离插销,并且,锁定组件能够迅速将钢板锁在插销上,简化了钢板固定在圆形架上的安装流程,提升了操作效率,降低了劳动强度,另外,避免了使用尖锐的铁丝固定钢板,避免操作人员的手部被划伤的风险。

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Abstract

The utility model discloses a kind of hanger devices of vacuum coating machine, comprising: circular frame;Hanging piece, and hanging piece includes bolt and limit head, limit head is fixedly arranged at the end of bolt, bolt can be inserted into the through hole of steel plate, to hang steel plate;Locking assembly, including limit sleeve, lock tongue and spring, the inside of limit sleeve can be inserted into bolt or separate, lock tongue is slidably arranged in the inside of limit sleeve, spring can drive lock tongue to be close to the radial outer surface of bolt, after bolt is inserted into the inside of limit sleeve, lock tongue can abut against limit head abut, to make limit sleeve lock in bolt;Unlocking assembly, including unlocking piece, unlocking piece is slidably arranged in bolt, unlocking piece can abut against lock tongue, make lock tongue and limit head abut against, to make limit sleeve separate from bolt. It can simplify the installation process of steel plate fixed on circular frame, improve operating efficiency, reduce labor intensity.
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Description

Technical Field

[0001] This utility model relates to the technical field of steel plate production equipment, and in particular to a mounting device for a vacuum coating machine. Background Technology

[0002] Vacuum coating machines create a vacuum environment inside, forming a thin film with specific functions on the surface of the workpiece. During this process, the workpiece to be coated needs to be securely placed on a rack and enter the vacuum chamber together with the rack for rotational coating to ensure the uniformity of the film layer.

[0003] For some plate-shaped workpieces, such as various thin steel plates, circumferentially arranged hangers are typically used for clamping. Specifically, the hangers are usually designed as cylindrical or frame-like structures with fixing points around their perimeter. In the existing technology, the most common method for fixing steel plates is for the operator to first align the through holes on the steel plate with the corresponding positions on the hanger, and then use a wire to pass through the through holes of the steel plate and wrap it around the frame of the hanger. The binding force of the wire secures the steel plate to the hanger.

[0004] However, each steel plate usually requires at least two fixing points, and multiple steel plates often need to be fixed on one hanger. Operators need to repeatedly perform steps such as piercing, wrapping, and tightening, which is labor-intensive. In addition, the ends of the wires usually have sharp ends, and the operators' hands are very easily cut or punctured by these sharp wire ends during the process of forcefully wrapping and unwrapping. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a mounting device for a vacuum coating machine, which simplifies the installation process of fixing steel plates to a circular frame, improves operational efficiency, reduces labor intensity, and avoids the risk of operators' hands being cut by using sharp wires to fix the steel plates.

[0006] A mounting device for a vacuum coating machine according to an embodiment of the present invention includes: a circular frame; multiple mounting members disposed on the radial outer surface of the circular frame, each mounting member including a pin and a limiting head, the limiting head being fixedly disposed at the end of the pin, the pin being able to be inserted through a through hole of a steel plate to suspend the steel plate; a locking assembly including a limiting sleeve, a locking tongue, and a spring, the limiting sleeve being able to insert into or disengage from the pin, the locking tongue being slidably disposed within the limiting sleeve, the spring being able to drive the locking tongue to approach the radial outer surface of the pin, after the pin is inserted into the limiting sleeve, the locking tongue being able to abut against the limiting head, thereby locking the limiting sleeve against the pin; and an unlocking assembly including an unlocking member slidably disposed on the pin, the unlocking member being able to abut against the locking tongue, causing the locking tongue to disengage from the limiting head, thereby disengaging the limiting sleeve from the pin.

[0007] The fixture device for a vacuum coating machine according to an embodiment of the present invention has at least the following beneficial effects: 1. This utility model, by setting a pin, a limiting head, a limiting sleeve, a locking tongue, and a spring, allows the operator to move the steel plate to the circular frame, align the through hole of the steel plate with the pin, and insert the pin into the through hole of the steel plate. Then, the limiting sleeve is aligned with the limiting head on the pin. When the locking tongue moves past the limiting head, the spring is compressed. After the locking tongue passes the limiting head, it can abut against the side end of the limiting head, preventing the limiting sleeve from detaching from the pin. Thus, the limiting sleeve can prevent the steel plate from detaching from the pin, avoiding the steel plate from detaching from the pin during the operation of the circular frame. Furthermore, the locking component can quickly lock the steel plate onto the pin, simplifying the installation process of fixing the steel plate to the circular frame, improving operating efficiency, reducing labor intensity, and avoiding the use of sharp iron wire to fix the steel plate, thus avoiding the risk of the operator's hands being cut.

[0008] 2. This utility model, by setting an unlocking component, allows the operator to push the limiting sleeve towards the steel plate, causing the locking tongue to abut against the unlocking component. The locking tongue can then move through the unlocking component, releasing the locking tongue from the limiting head. Next, the operator pushes and pulls the limiting sleeve away from the steel plate, causing the locking tongue to abut against the unlocking component again, which in turn abuts against the limiting head. This allows the locking tongue to move through the unlocking component and the limiting head, enabling the limiting sleeve to disengage from the pin. In this way, the steel plate can be removed from the pin, greatly improving the efficiency of steel plate removal.

[0009] According to an embodiment of the present invention, a fixture device for a vacuum coating machine is provided, wherein the limiting head is provided with a first guide surface, and the locking tongue can abut against the first guide surface to slide through the limiting head.

[0010] According to an embodiment of the present invention, a mounting device for a vacuum coating machine is provided, wherein the pin has a mounting section and a connecting section connected to the mounting section, the diameter of the mounting section is larger than the diameter of the connecting section, the end of the connecting section away from the mounting section is connected to the limiting head, and the unlocking member is provided with a guide hole that matches the connecting section.

[0011] According to an embodiment of the present invention, a mounting device for a vacuum coating machine is provided with a second guide surface on the locking tongue, the second guide surface being able to abut against the unlocking member, so that the locking tongue slides through the unlocking member.

[0012] According to an embodiment of the present invention, a mounting device for a vacuum coating machine is provided, wherein the unlocking member is provided with a third guide surface, and when the locking tongue passes through the unlocking member, the locking tongue can abut against the third guide surface when it moves in the direction close to the limiting head, so that the locking tongue can slide through the unlocking member and the limiting head, thereby causing the limiting sleeve to disengage from the pin.

[0013] According to an embodiment of the present invention, a mounting device for a vacuum coating machine is provided, wherein two locking tongues are provided, and the two locking tongues are distributed circumferentially along the limiting sleeve.

[0014] According to an embodiment of the present invention, a fixture device for a vacuum coating machine is provided at the end of the limiting sleeve, and the handle is a spherical structure.

[0015] According to an embodiment of the present utility model, a mounting device for a vacuum coating machine is provided, wherein the pin has a retaining ring at the end away from the limiting head and a guide portion is provided on the retaining ring, the circular frame has a connecting plate, the connecting plate is provided with an oblong hole, the oblong hole extends along the circumference of the circular frame, and the guide portion passes through the oblong hole and is tightened with a nut.

[0016] According to an embodiment of the present invention, a mounting device for a vacuum coating machine is provided, wherein the circular frame has a vertical pole, the connecting plate is provided with a connecting sleeve, the connecting sleeve is fitted onto the vertical pole, the connecting sleeve is provided with a locking bolt, and the end of the locking bolt abuts against the side wall of the vertical pole.

[0017] According to an embodiment of the present invention, a mounting device for a vacuum coating machine is provided, wherein a circular frame is provided with a plurality of brackets, the plurality of brackets being distributed circumferentially along the circular frame, the brackets being used to support the bottom of an upright steel plate, and the brackets being provided with recesses, the recesses being used to limit the position of the bottom of the steel plate.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a fixture device for a vacuum coating machine according to an embodiment of the present invention; Figure 2 for Figure 1 A front view of a fixture assembly for a vacuum coating machine is shown. Figure 3 for Figure 1 A schematic diagram showing the steel plate locking state of a fixture device for a vacuum coating machine is shown. Figure 4 for Figure 1 A schematic diagram showing the unlocked state of a fixture device for a vacuum coating machine is shown. Figure 5 for Figure 1 The diagram shows the structure for removing the limiting sleeve.

[0021] Reference numerals: 100-circular frame, 110-hanging part, 120-pin, 130-limiting head, 140-limiting sleeve, 150-locking tongue, 160-spring, 170-unlocking part, 180-first guide surface, 190-hanging section, 200-connecting section, 210-second guide surface, 220-third guide surface, 230-handle, 240-retaining ring, 250-guide part, 260-connecting plate, 270-slotted hole, 280-upright pole, 290-connecting sleeve, 300-locking bolt, 310-bracket, 320-recess, 350-nut. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" and "second" are mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation, connection, and linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] The following description, in conjunction with the accompanying drawings, describes a mounting device for a vacuum coating machine according to an embodiment of the present invention.

[0027] Reference Figure 1 The present invention aims to provide an embodiment of a fixture device for a vacuum coating machine.

[0028] This utility model provides a fixture device for a vacuum coating machine, referring to... Figure 1 and Figure 2 It includes a circular frame 100, a mounting bracket 110, and a locking assembly. Multiple mounting brackets 110 are provided, and the multiple mounting brackets 110 are disposed on the radial outer surface of the circular frame 100, as shown in the figure. Figure 3 and Figure 4The mounting component 110 includes a pin 120 and a limiting head 130. The limiting head 130 is fixedly disposed at the end of the pin 120. The pin 120 can be inserted through a through hole of a steel plate to suspend the steel plate. The locking component includes a limiting sleeve 140, a locking tongue 150, and a spring 160. The interior of the limiting sleeve 140 can be inserted into or disengaged from the pin 120. The locking tongue 150 is slidably disposed inside the limiting sleeve 140. The spring 160 can drive the locking tongue 150 to approach the radial outer surface of the pin 120. After the pin 120 is inserted into the interior of the limiting sleeve 140, the locking tongue 150 can abut against the limiting head 130, thereby locking the limiting sleeve 140 onto the pin 120.

[0029] It should be noted that the steel plate is thin and flexible, and can be bent and arranged along the circumference of the circular frame 100.

[0030] Understandably, this utility model, by setting up a pin 120, a limiting head 130, a limiting sleeve 140, a locking tongue 150, and a spring 160, allows the operator to move the steel plate to the circular frame 100, aligning the through hole of the steel plate with the pin 120, and inserting the pin 120 into the through hole of the steel plate. Then, the limiting sleeve 140 is aligned with the limiting head 130 on the pin 120. When the locking tongue 150 moves past the limiting head 130, the spring 160 is compressed. After the locking tongue 150 passes the limiting head 130, the locking tongue 150 can resist... The side end of the limiting head 130 is connected so that the limiting sleeve 140 cannot disengage from the pin 120. Thus, the limiting sleeve 140 can prevent the steel plate from disengaging from the pin 120, avoiding the steel plate from disengaging from the pin 120 during the operation of the circular frame 100. In addition, the locking component can quickly lock the steel plate onto the pin 120, simplifying the installation process of fixing the steel plate to the circular frame 100, improving operating efficiency, reducing labor intensity, and avoiding the use of sharp iron wire to fix the steel plate, thus avoiding the risk of the operator's hands being cut.

[0031] This utility model provides a fixture device for a vacuum coating machine, referring to... Figure 4 and Figure 5 It also includes an unlocking component, including an unlocking element 170, which is slidably disposed on the pin 120. The unlocking element 170 can abut against the locking tongue 150, thereby disengaging the locking tongue 150 from the limiting head 130, and thus disengaging the limiting sleeve 140 from the pin 120.

[0032] Understandably, by setting up the unlocking component 170, the operator pushes the limiting sleeve 140 in the direction close to the steel plate, causing the locking tongue 150 to abut against the unlocking component 170. The locking tongue 150 can move through the unlocking component 170, and the locking tongue 150 releases its contact with the limiting head 130. Then, the operator pushes and pulls the limiting sleeve 140 in the direction away from the steel plate, and the locking tongue 150 abuts against the unlocking component 170 again, causing the unlocking component 170 to abut against the limiting head 130. Thus, the locking tongue 150 moves through the unlocking component 170 and the limiting head 130, allowing the limiting sleeve 140 to disengage from the pin 120. In this way, the steel plate can be removed from the pin 120, greatly improving the efficiency of steel plate removal.

[0033] In some embodiments of this utility model, the limiting head 130 is provided with a first guide surface 180, and the locking tongue 150 can abut against the first guide surface 180 to slide through the limiting head 130.

[0034] It is understandable that the first guide surface 180 is an arc-shaped surface. By having the locking tongue 150 abut against the first guide surface 180, the locking tongue 150 can smoothly slide past the limiting head 130 and automatically lock into the locking position when the limiting sleeve 140 is inserted into the pin 120. This achieves the function of automatic locking with one-way insertion, making the operation smooth and effortless.

[0035] In some embodiments of this utility model, the pin 120 has a hook section 190 and a connecting section 200 connected to the hook section 190. The diameter of the hook section 190 is larger than the diameter of the connecting section 200. The end of the connecting section 200 away from the hook section 190 is connected to the limiting head 130. The unlocking member 170 is provided with a guide hole that matches the connecting section 200.

[0036] Understandably, the diameter of the hook section 190 is larger than that of the connecting section 200, forming a stepped surface. The stepped surface can prevent the unlocking member 170 from moving, ensuring that the locking tongue 150 can abut against the unlocking member 170, thereby achieving the unlocking function.

[0037] The unlocking component 170 has a ring structure. The guide hole inside the unlocking component 170 matches the connecting section 200, ensuring that the unlocking component 170 slides smoothly along the axis of the pin 120, and the action is precise and reliable.

[0038] In some embodiments of this utility model, the locking tongue 150 is provided with a second guide surface 210, which can abut against the unlocking member 170, so that the locking tongue 150 slides through the unlocking member 170.

[0039] Understandably, when the second guide surface 210 on the latch 150 contacts the unlocking member 170, the latch 150 can retract smoothly, the spring 160 is compressed, the spring 160 force is overcome and the locking of the limit head 130 is released, so that the unlocking action is smooth and controllable, and damage to the components is avoided.

[0040] In some embodiments of this utility model, the unlocking member 170 is provided with a third guide surface 220. After the locking tongue 150 passes through the unlocking member 170, when the locking tongue 150 moves in the direction close to the limiting head 130, it can abut against the third guide surface 220, so that the locking tongue 150 can slide through the unlocking member 170 and the limiting head 130, thereby causing the limiting sleeve 140 to disengage from the pin 120.

[0041] Understandably, by setting the third guide surface 220, when the limiting sleeve 140 is pulled outward during unlocking, the locking tongue 150 can slide along the third guide surface 220 and automatically compress the spring 160, allowing the limiting sleeve 140 to smoothly disengage from the pin 120, thus achieving quick disassembly of the limiting sleeve 140.

[0042] In some embodiments of this utility model, two locking tongues 150 are provided, and the two locking tongues 150 are distributed circumferentially along the limiting sleeve 140. It can be understood that the circumferential distribution of the two locking tongues 150 can apply symmetrical locking force to the limiting head 130, avoid the off-center load and wear that may be caused by single-point force, and ensure a more stable and reliable locking state.

[0043] In some embodiments of this utility model, the end of the limiting sleeve 140 is provided with a handle 230, and the handle 230 has a spherical structure.

[0044] The ball handle 230 provides a comfortable grip point, making it easier for the operator to apply force for insertion and removal operations, further improving the convenience and comfort of operation.

[0045] In some embodiments of this utility model, the end of the pin 120 away from the limiting head 130 has a retaining ring 240 and a guide portion 250 disposed on the retaining ring 240. The circular frame 100 has a connecting plate 260, the connecting plate 260 is provided with an oblong hole 270, the oblong hole 270 extends circumferentially along the circular frame 100, and the guide portion 250 passes through the oblong hole 270 and is tightened with the nut 330.

[0046] The waist-shaped hole 270 allows the pin 120 and its hanger 110 to be adjusted in the circumference of the circular frame 100. After adjustment, the nut 330 can be threadedly connected to the guide part 250 to fix it. Thus, the hanger can be adapted to hang steel plates of different sizes and hole positions, greatly enhancing the versatility of the hanger.

[0047] In some embodiments of this utility model, the circular frame 100 has a vertical pole 280, a connecting plate 260 is provided with a connecting sleeve 290, the connecting sleeve 290 is fitted onto the vertical pole 280, and the connecting sleeve 290 is provided with a locking bolt 300, the end of the locking bolt 300 abutting against the side wall of the vertical pole 280.

[0048] The cooperation between the connecting sleeve 290 and the upright 280 allows the height of the entire hanging part 110 to be easily adjusted, so that the hanger can be adapted to hang steel plates at different heights. After adjustment, the position of the connecting sleeve 290 can be tightened by the locking bolt 300.

[0049] In some embodiments of this utility model, the circular frame 100 is provided with a plurality of brackets 310, which are distributed around the circumference of the circular frame 100. The brackets 310 are used to support the bottom of the vertically placed steel plate, and the brackets 310 are provided with a recess 320, which is used to limit the position of the bottom of the steel plate.

[0050] For large or heavy steel plates that are placed vertically, bracket 310 provides crucial bottom support, effectively preventing the steel plate from swaying due to its own weight or centrifugal force, and further ensuring the stability of the coating process.

[0051] In the description of this specification, references to terms such as "an embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A fixture device for a vacuum coating machine, characterized in that, include: Circular frame (100); Multiple hanging components (110) are provided, and multiple hanging components (110) are provided on the radial outer surface of the circular frame (100). Each hanging component (110) includes a pin (120) and a limiting head (130). The limiting head (130) is fixedly provided at the end of the pin (120). The pin (120) can be inserted through the through hole of the steel plate to suspend the steel plate. The locking assembly includes a limiting sleeve (140), a locking tongue (150), and a spring (160). The interior of the limiting sleeve (140) can be inserted into or disengaged from the pin (120). The locking tongue (150) is slidably disposed inside the limiting sleeve (140). The spring (160) can drive the locking tongue (150) to approach the radial outer surface of the pin (120). After the pin (120) is inserted into the limiting sleeve (140), the locking tongue (150) can abut against the limiting head (130), thereby locking the limiting sleeve (140) against the pin (120). The unlocking component includes an unlocking member (170) which is slidably disposed on the pin (120). The unlocking member (170) can abut against the latch (150) to disengage the latch (150) from the limiting head (130), thereby disengaging the limiting sleeve (140) from the pin (120).

2. The fixture device for a vacuum coating machine according to claim 1, characterized in that, The limiting head (130) is provided with a first guide surface (180), and the locking tongue (150) can abut against the first guide surface (180) to slide through the limiting head (130).

3. The fixture device for a vacuum coating machine according to claim 1, characterized in that, The pin (120) has a hook section (190) and a connecting section (200) connected to the hook section (190). The diameter of the hook section (190) is larger than the diameter of the connecting section (200). The end of the connecting section (200) away from the hook section (190) is connected to the limiting head (130). The unlocking member (170) is provided with a guide hole that matches the connecting section (200).

4. The fixture device for a vacuum coating machine according to claim 1, characterized in that, The latch (150) is provided with a second guide surface (210), which can abut against the unlocking member (170) so that the latch (150) slides through the unlocking member (170).

5. The fixture device for a vacuum coating machine according to claim 1, characterized in that, The unlocking component (170) is provided with a third guide surface (220). After the locking tongue (150) passes through the unlocking component (170), when the locking tongue (150) moves in the direction close to the limiting head (130), it can abut against the third guide surface (220), so that the locking tongue (150) can slide through the unlocking component (170) and the limiting head (130), thereby causing the limiting sleeve (140) to disengage from the pin (120).

6. The fixture device for a vacuum coating machine according to claim 1, characterized in that, Two locking tongues (150) are provided, and the two locking tongues (150) are distributed circumferentially along the limiting sleeve (140).

7. The fixture device for a vacuum coating machine according to claim 1, characterized in that, The end of the limiting sleeve (140) is provided with a handle (230), and the handle (230) is a spherical structure.

8. The fixture device for a vacuum coating machine according to claim 1, characterized in that, The pin (120) has a retaining ring (240) and a guide portion (250) disposed on the retaining ring (240) at the end away from the limiting head (130). The circular frame (100) has a connecting plate (260) with a waist-shaped hole (270) extending circumferentially along the circular frame (100). The guide portion (250) passes through the waist-shaped hole (270) and is tightened with a nut (330).

9. The fixture device for a vacuum coating machine according to claim 8, characterized in that, The circular frame (100) has a pole (280), and the connecting plate (260) is provided with a connecting sleeve (290). The connecting sleeve (290) is fitted onto the pole (280), and the connecting sleeve (290) is provided with a locking bolt (300). The end of the locking bolt (300) abuts against the side wall of the pole (280).

10. The fixture device for a vacuum coating machine according to claim 1, characterized in that, The circular frame (100) is provided with a plurality of brackets (310), which are distributed around the circumference of the circular frame (100). The brackets (310) are used to support the bottom of the vertically placed steel plate. The brackets (310) are provided with a recess (320) which is used to limit the position of the bottom of the steel plate.